阅读说明：本技术 一种具有温控功能的平板探测器及其温度控制方法 (Flat panel detector with temperature control function and temperature control method thereof ) 是由 黄显国 徐永 刘宇浩 陈凤 于 2021-09-17 设计创作，主要内容包括：本发明公开了一种具有温控功能的平板探测器及其温度控制方法,平板探测器包括影像传感器、金属结构框架、工作电路、热发生或交换单元和PID温控模块,用于负责阵列成像；金属结构框架用于支撑影像传感器,同时作为影像传感器热交换的导热介质；工作电路包括温度侦测电路、电源电路、主控电路和图像采集时序控制电路,热发生或交换单元用于制热或制冷,热发生或交换单元直接作用于金属结构框架；PID温控模块计算并调节热发生或交换单元的工作参数,并驱动热发生或交换单元加热或者散热,使影像传感器达到并稳定在目标温度。本发明提供的具有温控功能的平板探测器及其温度控制方法快速地完成探测器温度控制,减少产品开机使用的等待时间。(The invention discloses a flat panel detector with a temperature control function and a temperature control method thereof, wherein the flat panel detector comprises an image sensor, a metal structure frame, a working circuit, a heat generation or exchange unit and a PID temperature control module and is used for being responsible for array imaging; the metal structure frame is used for supporting the image sensor and is used as a heat-conducting medium for heat exchange of the image sensor; the working circuit comprises a temperature detection circuit, a power supply circuit, a main control circuit and an image acquisition time sequence control circuit, the heat generation or exchange unit is used for heating or refrigerating, and the heat generation or exchange unit directly acts on the metal structure frame; and the PID temperature control module calculates and adjusts working parameters of the heat generation or exchange unit, and drives the heat generation or exchange unit to heat or radiate so that the image sensor reaches and stabilizes at a target temperature. The flat panel detector with the temperature control function and the temperature control method thereof quickly finish the temperature control of the detector, and reduce the waiting time of starting up and using products.)

1. A flat panel detector with temperature control function is characterized by comprising

The image sensor (1), the said image sensor (1) is the photosensitive part, is used for being responsible for the array imaging;

the metal structure frame (2), the metal structure frame (2) is used for supporting the image sensor (1) and is used as a heat conducting medium for heat exchange of the image sensor (1);

-a heat generation or exchange unit (3), said heat generation or exchange unit (3) being used for system heating or cooling, said heat generation or exchange unit (3) acting directly on said metallic structural frame (2);

the working circuit (4), the working circuit (4) comprises a temperature detection circuit, a power circuit, a main control circuit and an image acquisition time sequence control circuit,

the temperature detection circuit comprises a plurality of temperature sensors which are distributed at a plurality of positions on the flat panel detector so as to realize temperature detection on a plurality of position points in the current environment temperature, the temperature of the image sensor (1), the temperature of the metal structure frame (2) and the temperature of the working circuit (4);

and the PID temperature control module calculates and adjusts working parameters of the heat generation or exchange unit (3) according to a preset target temperature and the actual temperature detected by the temperature detection circuit, and drives the heat generation or exchange unit (3) to heat or dissipate heat, so that the image sensor (1) reaches and is stabilized at the target temperature.

2. The flat panel detector with temperature control function according to claim 1, characterized in that the heat generating or exchanging unit (3) is heated by electric auxiliary heat and/or semiconductor heat pump; the heat generation or exchange unit (3) is cooled by one or more of natural cooling, air cooling, water cooling and electric cooling.

3. The flat panel detector with temperature control function according to claim 1, further comprising a temperature control policy enforcement module, wherein the temperature control policy enforcement module can adopt one or more temperature control policies to heat or dissipate heat from the image sensor (1), and the PID temperature control module calculates and adjusts parameters of the temperature control policy enforcement module according to the target temperature and the actual temperature detected by the temperature detection circuit, and drives the temperature control policy enforcement module to heat or dissipate heat from the image sensor (1).

4. The flat panel detector with temperature control function according to claim 3, wherein the temperature control strategy execution module comprises a power adjusting unit for adjusting the heating power/heat dissipation power of the heat generating or exchanging unit (3) under the driving of the PID temperature control algorithm module;

if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power adjusting unit to improve the heat dissipation power and/or reduce the heating power; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power adjusting unit to reduce the heat dissipation power and/or improve the heating power.

5. The flat panel detector with temperature control function according to claim 3, wherein the temperature control strategy execution module comprises a first power unit, a second power unit and a duty cycle adjustment unit, the operating power consumption of the first power unit is higher than that of the second power unit, and the duty cycle adjustment unit is configured to adjust the operating time duty cycles of the first power unit and the second power unit under the driving of the PID temperature control module;

if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio adjusting unit to reduce the duty ratio of the first power unit in working time; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio adjusting unit to increase the duty ratio of the working time of the first power unit.

6. The flat panel detector with temperature control function according to claim 3, wherein the temperature control policy execution module includes a power consumption switching control unit and a plurality of circuit modules disposed on a circuit board disposed in the flat panel detector, each circuit module has a different thermal capacity and supports power consumption switching, and the power consumption switching control unit is configured to control a part or all of the circuit modules to switch power consumption to enumerate all of the thermal capacity combinations under driving of the PID temperature control module;

if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combination so as to reduce the heat capacity value; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combination so as to increase the heat capacity value.

7. The flat panel detector with temperature control function according to claim 3, wherein the temperature control strategy execution module comprises a free combination of the following three temperature control strategy execution modules:

the first temperature control strategy execution module comprises a power adjusting unit which is used for adjusting the heating power/heat dissipation power of the heat generation or exchange unit (3) under the driving of the PID temperature control module;

the second temperature control strategy execution module comprises a first power unit, a second power unit and a duty ratio regulation unit, wherein the working power consumption of the first power unit is higher than that of the second power unit, and the duty ratio regulation unit is used for regulating the working time duty ratios of the first power unit and the second power unit under the driving of the PID temperature control module;

the third temperature control strategy execution module comprises a power consumption switching control unit and a plurality of circuit modules arranged on a circuit board in the flat panel detector, each circuit module has different heat capacities and supports power consumption switching, and the power consumption switching control unit is used for controlling the switching power consumption of part or all circuit modules under the driving of the PID temperature control module so as to enumerate all heat capacity combinations.

8. A temperature control method of a flat panel detector is characterized by comprising the following steps:

s1, collecting the environment temperature, determining the setting mode of the target temperature of the flat panel detector, and obtaining the target temperature according to the environment temperature and the setting mode;

s2, inputting the obtained target temperature into a PID temperature control module, wherein the PID temperature control module drives a temperature control strategy execution module to heat or radiate the flat panel detector by utilizing a PID algorithm;

s3, detecting the current actual temperature of the flat panel detector, and feeding back actual temperature information to the PID temperature control module;

s4, judging whether the difference between the target temperature and the actual temperature is within a preset range, if so, keeping the current heating or radiating power consumption parameter by the temperature control strategy executing module to heat or radiate the flat panel detector and repeatedly executing S3-S4, otherwise, executing S5;

s5, according to the difference between the target temperature and the actual temperature, the PID temperature control module utilizes a PID algorithm to adjust the power consumption parameter of the temperature control strategy execution module so that the flat panel detector reaches and stabilizes at the target temperature, and S3-S4 are repeatedly executed.

9. The method for controlling the temperature of a flat panel detector according to claim 8, wherein in step S1, the target temperature is equal to the ambient temperature, or the target temperature is equal to the ambient temperature plus a forward offset, or the target temperature is equal to a fixed value, or the target temperature and the ambient temperature have a pre-established basis function relationship.

10. The method for controlling the temperature of a flat panel detector according to claim 8,

the PID temperature control module can drive the temperature control strategy execution module to heat or radiate the flat panel detector by one or more of the following temperature control strategies:

in a first temperature control strategy, the temperature control strategy execution module comprises a power adjusting unit, the power adjusting unit is used for adjusting the heating power/heat dissipation power of a heat generation or exchange unit under the driving of the PID temperature control module, if the actual temperature is higher than the target temperature and the difference value exceeds a preset threshold range, the PID temperature control module drives the power adjusting unit to increase the heat dissipation power and/or decrease the heating power, and if the actual temperature is lower than the target temperature and the difference value exceeds the preset threshold range, the PID temperature control module drives the power adjusting unit to decrease the heat dissipation power and/or increase the heating power;

in a second temperature control strategy, the temperature control strategy execution module comprises a first power unit, a second power unit and a duty ratio regulation unit, wherein the working power consumption of the first power unit is higher than that of the second power unit, the duty ratio regulation unit is used for regulating the working time duty ratios of the first power unit and the second power unit under the driving of the PID temperature control module, and if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio regulation unit to reduce the working time duty ratio of the first power unit; if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio adjusting unit to increase the duty ratio of the working time of the first power unit;

in a third temperature control strategy, the temperature control strategy execution module comprises a power consumption switching control unit and a plurality of circuit modules arranged on a circuit board in the flat panel detector, each circuit module has different heat capacities and supports power consumption switching, the power consumption switching control unit is used for controlling the switching power consumption of part or all circuit modules under the drive of the PID temperature control module so as to enumerate all heat capacity combinations, if the actual temperature is higher than the target temperature and the difference value thereof exceeds the preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combinations so as to reduce the heat capacity value, and if the actual temperature is lower than the target temperature and the difference value thereof exceeds the preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combinations so as to increase the heat capacity value.

Technical Field

The invention relates to the field of medical imaging equipment, in particular to a flat panel detector with a temperature control function and a temperature control method thereof.

Background

Because the gray scale of the pixel and the noise level are greatly influenced by the ambient temperature and are often not negligible, the flat panel detector generally needs to wait for about 1 hour after being started up in practical clinical use until the internal temperature of the detector is stabilized, and the flat panel detector is allowed to be used, so that the purpose is to ensure that the image performance is good enough and the diagnosis requirement can be always met. Meanwhile, for a flat panel detector without temperature control inside, besides a longer stabilization time, the internal temperature caused by a full power consumption circuit is too high, which also causes image noise and performance degradation. In addition, the temperature inside the system is greatly changed due to the influence of the external environment temperature, so that the challenges are brought to equipment calibration and image processing algorithms, and the image performance is difficult to ensure.

For example, in the patent application with publication number CN1752881A, the flat panel detector directly realizes the temperature adjustment of the heat conducting device to the detector through a temperature feedback control mode, the heating mode is single, and the waiting time for completing the heating is long; for another example, in the patent application with publication number CN203970408U, the flat panel detector has a temperature control module externally installed to adjust the temperature of the devices therein, which can save the internal space, but makes the integration of the whole device poor, the structure installation complicated, the placement is limited, the circuit of the heat exchange is single, the heating conditions of the circuit boards in different areas in the detector are not distinguished, the heating is not uniform, and the imaging effect is affected.

Stabilizing the flat panel detector at one or more temperature conditions can provide great benefits to system design. The system works at the maximum power consumption for a long time, the system has overheating risks in some environments, bad pixels are easy to generate on an image, and random noise of the system becomes high. If the system is continuously operated in the low power consumption mode, the temperature of the system is greatly changed when the system is continuously used, the correction effect of the system is degraded, and the dark noise is increased.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a flat panel detector with a temperature control function and a temperature control method thereof, wherein the technical scheme is as follows:

in one aspect, the present invention provides a flat panel detector with temperature control function, which comprises

The image sensor is a photosensitive component and is used for being in charge of array imaging;

the metal structure frame is used for supporting the image sensor and is used as a heat conducting medium for heat exchange of the image sensor;

a heat generation or exchange unit for system heating or cooling, said heat generation or exchange unit acting directly on said metallic structural frame;

a working circuit, which comprises a temperature detection circuit, a power circuit, a main control circuit and an image acquisition time sequence control circuit,

the temperature detection circuit comprises a plurality of temperature sensors which are distributed at a plurality of positions on the flat panel detector so as to realize temperature detection on a plurality of position points in the current environment temperature, the image sensor temperature, the metal structure frame temperature and the working circuit temperature;

and the PID temperature control module calculates and adjusts working parameters of the heat generation or exchange unit according to a preset target temperature and the actual temperature detected by the temperature detection circuit, and drives the heat generation or exchange unit to heat or dissipate heat, so that the image sensor reaches and stabilizes the target temperature.

Further, the heat generation or exchange unit is heated by electric auxiliary heat and/or a semiconductor heat pump; the heat generation or exchange unit is cooled by one or more modes of natural cooling, air cooling, water cooling and electric cooling.

Furthermore, the flat panel detector further comprises a temperature control strategy execution module, the temperature control strategy execution module can adopt one or more temperature control strategies to heat or dissipate heat of the image sensor, the PID temperature control module calculates and adjusts parameters of the temperature control strategy execution module according to the target temperature and the actual temperature detected by the temperature detection circuit, and drives the temperature control strategy execution module to heat or dissipate heat of the image sensor.

Further, the temperature control strategy execution module comprises a power adjusting unit, and the power adjusting unit is used for adjusting the heating power/heat dissipation power of the heat generating or exchanging unit under the driving of the PID temperature control module;

if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power adjusting unit to improve the heat dissipation power and/or reduce the heating power; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power adjusting unit to reduce the heat dissipation power and/or improve the heating power.

Further, the temperature control strategy execution module comprises a first power unit, a second power unit and a duty ratio adjustment unit, wherein the working power consumption of the first power unit is higher than that of the second power unit, and the duty ratio adjustment unit is used for adjusting the working time duty ratios of the first power unit and the second power unit under the driving of the PID temperature control module;

if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio adjusting unit to reduce the duty ratio of the first power unit in working time; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio adjusting unit to increase the duty ratio of the working time of the first power unit.

Furthermore, the temperature control strategy execution module comprises a power consumption switching control unit and a plurality of circuit modules arranged on a circuit board in the flat panel detector, each circuit module has different heat capacities and supports power consumption switching, and the power consumption switching control unit is used for controlling the switching power consumption of part or all circuit modules under the driving of the PID temperature control module so as to enumerate all heat capacity combinations;

if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combination so as to reduce the heat capacity value; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combination so as to increase the heat capacity value.

Further, the temperature control strategy execution module comprises a free combination of the following three temperature control strategy execution modules:

the first temperature control strategy execution module comprises a power adjusting unit, and the power adjusting unit is used for adjusting the heating power/heat dissipation power of the heat generating or exchanging unit under the driving of the PID temperature control module;

the second temperature control strategy execution module comprises a first power unit, a second power unit and a duty ratio regulation unit, wherein the working power consumption of the first power unit is higher than that of the second power unit, and the duty ratio regulation unit is used for regulating the working time duty ratios of the first power unit and the second power unit under the driving of the PID temperature control module;

the third temperature control strategy execution module comprises a power consumption switching control unit and a plurality of circuit modules arranged on a circuit board in the flat panel detector, each circuit module has different heat capacities and supports power consumption switching, and the power consumption switching control unit is used for controlling the switching power consumption of part or all circuit modules under the driving of the PID temperature control module so as to enumerate all heat capacity combinations.

In another aspect, the present invention provides a method for controlling a temperature of a flat panel detector, including the steps of:

s1, collecting the environment temperature, determining the setting mode of the target temperature of the flat panel detector, and obtaining the target temperature according to the environment temperature and the setting mode;

s2, inputting the obtained target temperature into a PID temperature control module, wherein the PID temperature control module drives a temperature control strategy execution module to heat or radiate the flat panel detector by utilizing a PID algorithm;

s3, detecting the current actual temperature of the flat panel detector, and feeding back actual temperature information to the PID temperature control module;

s4, judging whether the difference between the target temperature and the actual temperature is within a preset range, if so, keeping the current heating or radiating power consumption parameter by the temperature control strategy executing module to heat or radiate the flat panel detector and repeatedly executing S3-S4, otherwise, executing S5;

s5, according to the difference between the target temperature and the actual temperature, the PID temperature control module utilizes a PID algorithm to adjust the power consumption parameter of the temperature control strategy execution module so that the flat panel detector reaches and stabilizes at the target temperature, and S3-S4 are repeatedly executed.

Further, in step S1, the target temperature is equal to the ambient temperature, or the target temperature is equal to the ambient temperature plus a forward offset, or the target temperature is equal to a fixed value, or the target temperature and the ambient temperature have a pre-established basis function relationship.

Further, the PID temperature control module can drive the temperature control strategy execution module to perform one or more of the following temperature control strategies to heat or dissipate heat of the flat panel detector:

in a first temperature control strategy, the temperature control strategy execution module comprises a power adjusting unit, the power adjusting unit is used for adjusting the heating power/heat dissipation power of a heat generation or exchange unit under the driving of the PID temperature control module, if the actual temperature is higher than the target temperature and the difference value exceeds a preset threshold range, the PID temperature control module drives the power adjusting unit to increase the heat dissipation power and/or decrease the heating power, and if the actual temperature is lower than the target temperature and the difference value exceeds the preset threshold range, the PID temperature control module drives the power adjusting unit to decrease the heat dissipation power and/or increase the heating power;

in a second temperature control strategy, the temperature control strategy execution module comprises a first power unit, a second power unit and a duty ratio regulation unit, wherein the working power consumption of the first power unit is higher than that of the second power unit, the duty ratio regulation unit is used for regulating the working time duty ratios of the first power unit and the second power unit under the driving of the PID temperature control module, and if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio regulation unit to reduce the working time duty ratio of the first power unit; if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio adjusting unit to increase the duty ratio of the working time of the first power unit;

in a third temperature control strategy, the temperature control strategy execution module comprises a power consumption switching control unit and a plurality of circuit modules arranged on a circuit board in the flat panel detector, each circuit module has different heat capacities and supports power consumption switching, the power consumption switching control unit is used for controlling the switching power consumption of part or all circuit modules under the drive of the PID temperature control module so as to enumerate all heat capacity combinations, if the actual temperature is higher than the target temperature and the difference value thereof exceeds the preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combinations so as to reduce the heat capacity value, and if the actual temperature is lower than the target temperature and the difference value thereof exceeds the preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combinations so as to increase the heat capacity value.

The technical scheme provided by the invention has the following beneficial effects:

a. the flat panel detector can accurately and quickly reach the target temperature and maintain stability;

b. the waiting time for starting the product can be reduced, and the usability of the product is improved;

c. the optimal image performance can be obtained at normal temperature;

d. and the internal heat exchange of the flat panel detector is reasonably adjusted.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a flat panel detector with a temperature control function according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a control frame of a flat panel detector with a temperature control function according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a thermal mass combination of a flat panel detector circuit module with a temperature control function according to an embodiment of the present invention.

Wherein the reference numerals are respectively: 1-image sensor, 2-metal structure frame, 3-heat generation or exchange unit, 4-working circuit, 5-temperature detection point.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.

In an embodiment of the present invention, a flat panel detector with temperature control function is provided, referring to fig. 1, including an image sensor 1, a metal structure frame 2, a working circuit 4, a heat generating or exchanging unit 3 and a PID temperature control module, where the image sensor 1 is a photosensitive component for taking charge of array imaging; the metal structure frame 2 is used for supporting the image sensor 1 and is used as a heat conducting medium for heat exchange of the image sensor 1; the working circuit comprises a temperature detection circuit, a power supply circuit, a main control circuit and an image acquisition time sequence control circuit, the working circuit is also a heat generation unit, the working circuit is arranged on a circuit board arranged in one or more flat panel detectors, the temperature detection circuit comprises a plurality of temperature sensors which are distributed at each position of the detectors according to a certain rule, and the temperature detection circuit can detect one or more points of the environment temperature, the temperature of the image sensor 1, the temperature of the metal structure frame 2 and the temperature of the working circuit; the heat generating or exchanging unit 3 is used for heating or refrigerating, the heat generating or exchanging unit 3 can directly act on the metal structure frame 2, and the metal structure frame 2 can also be directly used as a heat exchange medium; the PID temperature control module calculates and adjusts working parameters of the heat generation or exchange unit 3 according to a preset target temperature and an actual temperature detected by the temperature detection circuit, and drives the heat generation or exchange unit 3 to heat or dissipate heat, so that the image sensor 1 reaches and stabilizes the target temperature.

Specifically, referring to fig. 1, the image sensor 1 is in contact with the upper surface of the metal structure frame 2, the circuit board is disposed below the metal structure frame 2 and inside the housing of the flat panel detector, a plurality of circuit modules with different heat capacities are disposed inside the flat panel detector, the circuit modules may be disposed on a whole circuit board or may be separately disposed on a plurality of circuit boards, and the temperature detection circuit distributes a plurality of temperature measurement units on different temperature detection points 5 to detect one or more points of the ambient temperature, the image sensor temperature, the metal structure frame temperature and the internal circuit temperature, and outputs temperature data to the PID temperature control module. The PID temperature control module calculates and adjusts working parameters of the heat generation or exchange unit 3 according to a preset target temperature and an actual temperature detected by the temperature detection circuit, and drives the heat generation or exchange unit 3 to heat or dissipate heat, wherein the heat generation or exchange unit comprises but is not limited to work in an air cooling mode, a water cooling mode, an electric auxiliary heating mode, a semiconductor heat pump mode and the like. Besides using the heat generating or exchanging unit, the PID temperature control module can also use the temperature control strategy execution module to replace the heat generating or exchanging unit by means of the larger difference of high and low power consumption of the internal working circuit itself, so as to complete the temperature control of the image sensor 1. It should be noted that the actual temperature may be equal to the detected temperature of the image sensor 1, or may be equal to an arithmetic value of a plurality of temperature values inside the flat panel detector detected by the temperature detection circuit, so as to truly reflect the temperature inside the flat panel detector.

In an embodiment of the present invention, the flat panel detector further includes a temperature control policy execution module, referring to fig. 2, the temperature control policy execution module adopts a plurality of temperature control policies to heat or dissipate heat from the image sensor 1, the PID temperature control module calculates and adjusts parameters of the temperature control policy execution module according to the target temperature and the actual temperature detected by the temperature detection circuit, selects an appropriate temperature control policy, and drives the temperature control policy execution module to heat or dissipate heat from the image sensor 1. The PID temperature control module can also be provided with a comparator for comparing the difference between the ambient temperature and the actual temperature, and the difference result is subjected to PID algorithm calculation so as to output and control the power consumption parameter of the temperature control strategy execution module.

The temperature control strategy execution module comprises a free combination of the following three temperature control strategy execution modules:

the first temperature control strategy execution module comprises a power adjusting unit, and the power adjusting unit is used for adjusting the heating power/heat dissipation power of the heat generating or exchanging unit 3 under the driving of the PID temperature control module;

the second temperature control strategy execution module comprises a first power unit, a second power unit and a duty ratio regulation unit, wherein the working power consumption of the first power unit is higher than that of the second power unit, and the duty ratio regulation unit is used for regulating the working time duty ratios of the first power unit and the second power unit under the driving of the PID temperature control module;

the third temperature control strategy execution module comprises a power consumption switching control unit and a plurality of circuit modules arranged on a circuit board in the flat panel detector, each circuit module has different heat capacities and supports power consumption switching, and the power consumption switching control unit is used for controlling the switching power consumption of part or all circuit modules under the driving of the PID temperature control module so as to enumerate all heat capacity combinations.

In one embodiment of the present invention, a temperature control method for a flat panel detector is provided, comprising the steps of:

s1, collecting the environment temperature, determining the setting mode of the target temperature of the flat panel detector, and obtaining the target temperature according to the environment temperature and the setting mode;

s2, inputting the obtained target temperature into a PID temperature control module, wherein the PID temperature control module drives a temperature control strategy execution module to heat or radiate the flat panel detector by utilizing a PID algorithm;

s3, detecting the current actual temperature of the flat panel detector, and feeding back actual temperature information to the PID temperature control module;

s4, judging whether the difference between the target temperature and the actual temperature is within a preset range, if so, keeping the current heating or radiating power consumption parameter by the temperature control strategy executing module to heat or radiate the flat panel detector and repeatedly executing S3-S4, otherwise, executing S5;

s5, according to the difference between the target temperature and the actual temperature, the PID temperature control module utilizes a PID algorithm to adjust the power consumption parameter of the temperature control strategy execution module so that the flat panel detector reaches and stabilizes at the target temperature, and S3-S4 are repeatedly executed.

In step S1, the target temperature selection strategy module is used to determine the target temperature, and the target temperature is set according to at least the following two selection strategies:

the first setting mode is suitable for no large change of the ambient temperature, if the variation of the ambient temperature in the unit time is within the reference range, the target temperature is equal to the ambient temperature, or the target temperature is equal to the ambient temperature plus a forward offset, the forward offset can cover the variation of the ambient temperature in the unit time, and the forward offset can be defined as a certain fixed value or a value changing relative to the ambient temperature.

It is also possible to have a pre-established basis function relationship between the target temperature and the ambient temperature, so that the offset between the target temperature and the ambient temperature gradually decreases as the ambient temperature increases, and such a design enables the overall equipment temperature to be always relatively low and stable.

In a second setting, the target temperature is equal to a fixed value. The method only considers the stability of the equipment, neglects the influence of the external temperature, and is beneficial to the image correction processing because the stabilized temperature is always a fixed value; meanwhile, if the difference between the set target temperature and the ambient temperature is large, it takes longer time to reach the target temperature; when the ambient temperature is higher than the preset target temperature, the control may fail.

The user can select the above two setting modes according to the actual situation of the ambient temperature, and it should be noted that the target temperature can be used alone as a reference for the temperature of the image sensor, and can also be used for measuring other temperature-controlled components of the flat panel detector.

In step S2, the PID temperature control module may obtain an initial power consumption parameter for driving the temperature control policy execution module according to the target temperature, or according to the difference between the target temperature and the ambient temperature, by using a PID algorithm, so as to heat or dissipate heat of the flat panel detector. It should be noted that the power consumption parameters include, but are not limited to, the amount of power, the frequency and duration of operation, and the like.

In an embodiment of the present invention, the temperature control policy enforcement module includes a free combination of the following three temperature control policy enforcement modules:

the first temperature control strategy execution module comprises a power adjusting unit, and the power adjusting unit is used for adjusting the heating power/heat dissipation power of the heat generating or exchanging unit under the driving of the PID temperature control module; if the actual temperature is higher than the target temperature and the difference value between the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power adjusting unit to improve the heat dissipation power and/or reduce the heating power; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power adjusting unit to reduce the heat dissipation power and/or improve the heating power.

Specifically, with the aid of a general PID algorithm, the temperature output after PID temperature control is executed is used as feedback input, the difference between a target point and the feedback input is calculated, the heating/heat dissipation power of a heat generation or exchange unit is determined according to the difference, and the process is circulated until the target temperature is finally reached and stabilized.

The second temperature control strategy execution module comprises a first power unit, a second power unit and a duty ratio regulation unit, wherein the working power consumption of the first power unit is higher than that of the second power unit, and the duty ratio regulation unit is used for regulating the working time duty ratios of the first power unit and the second power unit under the driving of the PID temperature control module; if the actual temperature is higher than the target temperature and the difference value between the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio adjusting unit to reduce the duty ratio of the first power unit in working time; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the duty ratio adjusting unit to increase the duty ratio of the working time of the first power unit.

Specifically, the first power unit and the second power unit respectively correspond to the highest power consumption state and the lowest power consumption state of the internal circuit board of the flat panel detector, then a duty ratio of the highest power consumption and the lowest power consumption state is started within a period T through a PID algorithm, and if a plurality of circuit boards exist in the power unit, the circuit boards can be controlled to operate according to the duty ratios with the highest power consumption and the lowest power consumption. The strategy has the advantages that the control algorithm is simple, the target temperature can be quickly reached as long as the corresponding PID parameters are well selected, however, due to the fact that the high power consumption and the low power consumption are switched to the stable temperature and have certain hysteresis, deviation and oscillation are easily generated in the actual temperature control process, and the control strategy can be temporarily disabled during the operation and the chart collection of the system.

The third temperature control strategy execution module comprises a power consumption switching control unit and a plurality of circuit modules arranged on a circuit board arranged in the flat panel detector, each circuit module has different heat capacities and supports power consumption switching, and the power consumption switching control unit is used for controlling the switching power consumption of part or all circuit modules under the driving of the PID temperature control module so as to enumerate all heat capacity combinations; if the actual temperature is higher than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combination so as to reduce the heat capacity value of the circuit module combination; and if the actual temperature is lower than the target temperature and the difference value of the actual temperature and the target temperature exceeds a preset threshold range, the PID temperature control module drives the power consumption switching control unit to switch the heat capacity combination so as to increase the heat capacity value of the circuit module combination.

Specifically, enumerating all power consumption types of the circuit modules, forming different heating combinations by utilizing different heat capacities of the circuit modules supporting power consumption switching inside during working, and then periodically controlling the system to operate under different power consumption type combinations according to the difference between the target temperature and the actual temperature so as to finally stabilize the system to the target temperature.

The three temperature control strategies can be operated independently or in a free combination mode, namely the situation that two or more temperature control strategies exist simultaneously is included, and the selection of the proper temperature control strategy is convenient according to the actual situation. It should be noted that, each scheme of the setting manner of the target temperature and each scheme of the temperature control policy can be freely combined to form a new temperature control technical scheme, and the combined scheme is still within the protection scope of the present embodiment.

In one embodiment of the present invention, the flat panel detector internally includes an image sensor, an aluminum frame, and an operating circuit supporting high and low power consumption switching, where the high and low power consumption of the operating circuit is used to describe the temperature control process instead of a dedicated heat generating or exchanging unit, see fig. 3.

The working circuit comprises a temperature detection circuit, a power circuit, a master control circuit, an image acquisition time sequence control circuit and various external electronic modules, and the circuits can be distributed on the circuit board in the form of circuit modules. The temperature detection circuit comprises a plurality of temperature measurement units and is used for completing multipoint real-time detection of the ambient temperature, the temperature of the image sensor, the temperature of the metal structure frame and the temperature of the internal circuit. The circuit can generate heat when in work, if no power supply is managed, the system can continuously consume high power, and finally heat balance is achieved, and at the moment, the rate of the circuit generating heat is equal to or similar to the rate of the system heat dissipation.

Through the program in the main control circuit, the internal circuits and the external electronic modules of different parts can be controlled to switch between high power consumption and low power consumption. The contribution ratio of the circuit module to the system temperature heat within the same time is defined as the heat capacity of the circuit, and assuming that the heat capacities of the internal circuits with high power consumption are respectively denoted as K1, K2, and K3 …, different heat capacity combinations can be formed, such as K1, K1+ K3, K2+ K3, K1+ K2+ K3 …, and the heat capacity of each internal circuit can be measured and calculated under certain temperature conditions, certain time, and certain combination conditions. The heat capacity value of the circuit module can be approximately calculated by reading the external environment temperature and the temperature of the part of the circuit close to the metal structure frame of the circuit when the part of the circuit works. By means of different heat capacities generated by each circuit module during high power consumption and low power consumption, the temperature of the flat panel detector can be controlled to be stabilized to the preset target temperature by detecting the difference between the current temperature and the target temperature in real time and utilizing a PID temperature control algorithm.

The preset target temperature is the temperature which needs to be controlled and reached by the image sensor and is defined as the current environment temperature plus an offset value, after the equipment is powered on, the initial temperature of each internal part is consistent with the environment temperature, the target temperature and the current environment temperature value are read intermittently, PID control parameters are obtained by utilizing a PID temperature control algorithm, a corresponding table of PID control parameters and heat capacity combination is established, and when the PID control parameters are obtained through calculation, a corresponding heat capacity combination circuit is started, so that a corresponding circuit module runs in a high power consumption state.

The use of the different heat capacities of the system circuit to perform temperature control has some limitations, for example, the flat panel detector needs to operate in a high power consumption state when normally acquiring images, and the temperature control fails. In addition, enough difference should be kept between the total high and low power consumption so that the system does not have to wait too long to reach the target temperature steady state.

The flat panel detector with the temperature control function and the temperature control method thereof provided by the invention utilize the internal structure design model and the temperature feedback of the flat panel, and can accurately and quickly complete the temperature control of the detector, so that the temperature control is hardly influenced by the external environment temperature, on one hand, the waiting time for starting the product for use can be reduced, the usability of the product is improved, and on the other hand, the optimal image performance can be obtained at normal temperature.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.