Voltage control method, system and device and vehicle-mounted converter
阅读说明：本技术 一种电压控制方法、系统、装置及车载变换器 (Voltage control method, system and device and vehicle-mounted converter ) 是由 林伟民 王志东 王元 于 2020-11-12 设计创作，主要内容包括：本发明公开了一种电压控制方法、系统、装置及车载变换器,该方案中,先获取取力发电机经过整流模块整流后的输出电压,然后判断输出电压是否在输出电压的预设范围内,在输出电压不在预设范围内时,控制目标电压增大或减小以使支撑电容吸收的功率增大或减小。可见,本申请在取力发电机经过整流模块整流后的输出电压波动时,控制目标电压增大以使整流模块的输出端向支撑电容转移的能量增大；或控制目标电压减小以使整流模块的输出端向支撑电容转移的能量减小,相当于添加了一个虚拟阻抗,能够减小取力发电机经过整流模块整流后的输出电压的波动,提高了取力发电机工作的稳定性,减少了对车载电池的使用。(The invention discloses a voltage control method, a system, a device and a vehicle-mounted converter. Therefore, when the output voltage of the power take-off generator rectified by the rectifying module fluctuates, the target voltage is controlled to be increased so that the energy transferred from the output end of the rectifying module to the supporting capacitor is increased; or the target voltage is controlled to be reduced so that the energy transferred from the output end of the rectifier module to the support capacitor is reduced, namely, a virtual impedance is added, so that the fluctuation of the output voltage of the power take-off generator rectified by the rectifier module can be reduced, the working stability of the power take-off generator is improved, and the use of a vehicle-mounted battery is reduced.)
1. A voltage control method is applied to a vehicle-mounted converter, and is characterized by comprising the following steps:
acquiring output voltage of a power take-off generator rectified by a rectifying module, wherein the power take-off generator is linked with a vehicle engine to realize power generation;
judging whether the output voltage is within a preset range of the output voltage;
if not, controlling the target voltage of the supporting capacitor to increase based on the output voltage so as to increase the energy transferred from the output end of the rectifying module to the supporting capacitor, or controlling the target voltage of the supporting capacitor to decrease so as to decrease the energy transferred from the output end of the rectifying module to the supporting capacitor, so as to keep the output voltage of the power take-off generator after being rectified by the rectifying module stable.
2. The voltage control method according to claim 1, wherein a dc/dc conversion module is provided between the rectifying module and the support capacitor;
after controlling the target voltage of the supporting capacitor to increase or decrease based on the output voltage, the method further includes:
generating a control signal based on the increased or decreased target voltage;
and outputting the control signal to the direct current/direct current conversion module to adjust the energy transferred from the output end of the rectification module to the support capacitor to increase or decrease.
3. The voltage control method of claim 2, wherein controlling the target voltage of the support capacitance to increase or decrease based on the output voltage comprises:
judging whether the output voltage is larger than the maximum value of the preset range or smaller than the minimum value of the preset range;
if the output voltage is larger than the maximum value of the preset range, controlling the target voltage of the support capacitor to increase;
and if the output voltage is smaller than the minimum value of the preset range, controlling the target voltage of the support capacitor to be reduced.
4. The voltage control method of claim 1, wherein obtaining the output voltage of the power take-off generator after being rectified by the rectification module comprises:
and receiving the output voltage of the power takeoff generator rectified by the rectifying module, wherein the output voltage is sent by the detection filtering module, and the filter coefficient of the detection filtering module is greater than the corresponding filter coefficient when the output voltage of the power takeoff generator rectified by the rectifying module is stable.
5. The voltage control method of claim 4, further comprising:
the power take-off generator controller receives the output voltage of the power take-off generator rectified by the rectifying module and outputs a motor control signal based on the output voltage to control the output voltage of the power take-off generator rectified by the rectifying module.
6. The voltage control method of claim 1, wherein controlling the target voltage to increase based on the output voltage to increase the energy transferred by the output terminal of the rectifier module to the support capacitor comprises:
and controlling the target voltage to be increased based on the output voltage and the maximum value of the energy absorbable by the supporting capacitor so as to increase the energy transferred from the output end of the rectifying module to the supporting capacitor.
7. The voltage control method of any one of claims 1-6, further comprising:
judging whether the output voltage is greater than an output voltage threshold value, wherein the output voltage threshold value is greater than the maximum value of the preset range;
if yes, the alarm device is controlled to give an alarm.
8. A voltage control system applied to a vehicle-mounted converter is characterized by comprising:
the power take-off control system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring output voltage of a power take-off generator after rectification by a rectification module, and the power take-off generator is linked with a vehicle engine to realize power generation;
the judging unit is used for judging whether the output voltage is within a preset range of the output voltage;
and the control unit is used for controlling the target voltage of the supporting capacitor to increase so as to increase the energy transferred from the output end of the rectifying module to the supporting capacitor, or controlling the target voltage of the supporting capacitor to decrease so as to decrease the energy transferred from the output end of the rectifying module to the supporting capacitor, so as to keep the output voltage of the power take-off generator after being rectified by the rectifying module stable.
9. A voltage control apparatus, comprising:
a memory for storing a computer program;
a processor for implementing the voltage control method of any one of claims 1 to 7 when executing the computer program.
10. A vehicle-mounted inverter characterized by comprising the voltage control device according to claim 9.
Technical Field
The invention relates to the field of voltage control, in particular to a voltage control method, a system, a device and a vehicle-mounted converter.
Background
The power take-off power generation system is a vehicle-mounted power generation system using a power take-off generator for vehicle running as a power source. Specifically, the load carrying capacity of the power take-off generator is positively correlated with the rotation speed of the power take-off generator, but the rotation speed of the power take-off generator changes in real time in the actual running process of the vehicle, and due to poor control characteristics of the output voltage of the power take-off generator, when the rotation speed of the power take-off generator changes or the load connected with the power take-off generator changes, the output voltage of the power take-off generator may fluctuate, and an undervoltage protection point or an overvoltage protection point of the power take-off generator is easily reached, that is, the output voltage of the power take-off generator is too low or too high, and at this time, the power take-off generator stops supplying power to the load. In order to enable a load to work normally, a vehicle-mounted battery is used for supplying power to the load in the prior art, but the electric quantity of the vehicle-mounted battery is limited, and in order to reduce the use of the vehicle-mounted battery, a voltage control method is provided to reduce the fluctuation of the output voltage of the power take-off generator, so that the output voltage of the power take-off generator does not reach the undervoltage protection point or the overvoltage protection point of the power take-off generator.
Disclosure of Invention
The invention aims to provide a voltage control method, a system, a device and a vehicle-mounted converter, which can reduce the fluctuation of the output voltage of a power take-off generator after being rectified by a rectifying module, improve the working stability of the power take-off generator and reduce the use of a vehicle-mounted battery.
In order to solve the above technical problem, the present invention provides a voltage control method applied to a vehicle-mounted converter, including:
acquiring output voltage of a power take-off generator rectified by a rectifying module, wherein the power take-off generator is linked with a vehicle engine to realize power generation;
judging whether the output voltage is within a preset range of the output voltage;
if not, controlling the target voltage of the supporting capacitor to increase based on the output voltage so as to increase the energy transferred from the output end of the rectifying module to the supporting capacitor, or controlling the target voltage of the supporting capacitor to decrease so as to decrease the energy transferred from the output end of the rectifying module to the supporting capacitor, so as to keep the output voltage of the power take-off generator after being rectified by the rectifying module stable.
Preferably, a dc/dc conversion module is disposed between the rectifier module and the support capacitor;
after controlling the target voltage of the supporting capacitor to increase or decrease based on the output voltage, the method further includes:
generating a control signal based on the increased or decreased target voltage;
and outputting the control signal to the direct current/direct current conversion module to adjust the energy transferred from the output end of the rectification module to the support capacitor to increase or decrease.
Preferably, controlling the target voltage of the support capacitor to increase or decrease based on the output voltage includes:
judging whether the output voltage is larger than the maximum value of the preset range or smaller than the minimum value of the preset range;
if the output voltage is larger than the maximum value of the preset range, controlling the target voltage of the support capacitor to increase;
and if the output voltage is smaller than the minimum value of the preset range, controlling the target voltage of the support capacitor to be reduced.
Preferably, obtaining the output voltage of the power take-off generator after being rectified by the rectifying module comprises:
and receiving the output voltage of the power takeoff generator rectified by the rectifying module, wherein the output voltage is sent by the detection filtering module, and the filter coefficient of the detection filtering module is greater than the corresponding filter coefficient when the output voltage of the power takeoff generator rectified by the rectifying module is stable.
Preferably, the method further comprises the following steps:
the power take-off generator controller receives the output voltage of the power take-off generator rectified by the rectifying module and outputs a motor control signal based on the output voltage to control the output voltage of the power take-off generator rectified by the rectifying module.
Preferably, the controlling the target voltage to be increased based on the output voltage to increase the energy transferred from the output terminal of the rectifier module to the support capacitor includes:
and controlling the target voltage to be increased based on the output voltage and the maximum value of the energy absorbable by the supporting capacitor so as to increase the energy transferred from the output end of the rectifying module to the supporting capacitor.
Preferably, the method further comprises the following steps:
judging whether the output voltage is greater than an output voltage threshold value, wherein the output voltage threshold value is greater than the maximum value of the preset range;
if yes, the alarm device is controlled to give an alarm.
In order to solve the above technical problem, the present application further provides a voltage control system applied to a vehicle-mounted converter, including:
the power take-off control system comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring output voltage of a power take-off generator after rectification by a rectification module, and the power take-off generator is linked with a vehicle engine to realize power generation;
the judging unit is used for judging whether the output voltage is within a preset range of the output voltage;
and the control unit is used for controlling the target voltage of the supporting capacitor to increase so as to increase the energy transferred from the output end of the rectifying module to the supporting capacitor, or controlling the target voltage of the supporting capacitor to decrease so as to decrease the energy transferred from the output end of the rectifying module to the supporting capacitor, so as to keep the output voltage of the power take-off generator after being rectified by the rectifying module stable.
In order to solve the above technical problem, the present application further provides a voltage control apparatus, including:
a memory for storing a computer program;
a processor for implementing the voltage control method when executing the computer program.
A vehicle-mounted converter comprises the voltage control device.
The application provides a voltage control method, in the scheme, output voltage of a power take-off generator rectified by a rectifying module is obtained firstly, then whether the output voltage is equal to preset output voltage or not is judged, and when the output voltage is not equal to the preset output voltage, charging or discharging of an energy storage module is controlled. Therefore, when the output voltage of the power take-off generator rectified by the rectifying module fluctuates, the control target voltage is increased to increase the energy transferred from the output end of the rectifying module to the supporting capacitor or the control target voltage is reduced to reduce the energy transferred from the output end of the rectifying module to the supporting capacitor, namely, a virtual impedance is added, so that the fluctuation of the output voltage of the power take-off generator rectified by the rectifying module can be reduced, the working stability of the power take-off generator is improved, and the use of a vehicle-mounted battery is reduced.
The application also provides a voltage control system, a voltage control device and a vehicle-mounted converter, and the voltage control system, the voltage control device and the vehicle-mounted converter have the same beneficial effects as the voltage control method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described 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 without creative efforts.
FIG. 1 is a schematic flow chart of a voltage control method according to the present invention;
FIG. 2 is a schematic diagram of an experimental result of a method of the present invention without using a voltage control;
FIG. 3 is a schematic diagram of experimental results of a method for controlling voltage according to the present invention;
fig. 4 is a schematic diagram of a Boost circuit provided in the present invention;
FIG. 5 is a block diagram of a voltage control system according to the present invention;
FIG. 6 is a block diagram of a voltage control apparatus according to the present invention;
fig. 7 is a block diagram of a vehicle-mounted rectification inverter device provided by the invention.
Detailed Description
The core of the invention is to provide a voltage control method, a system, a device and a vehicle-mounted converter, which can reduce the fluctuation of the output voltage of the power take-off generator after being rectified by a rectifying module, improve the working stability of the power take-off generator and reduce the use of a vehicle-mounted battery.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, fig. 1 is a schematic flow chart of a voltage control method applied to a vehicle-mounted converter according to the present invention, including:
s11: acquiring output voltage of the power take-off generator after rectification by the rectification module, wherein the power take-off generator is linked with a vehicle engine to realize power generation;
s12: judging whether the output voltage is within a preset range of the output voltage or not;
s13: if not, the target voltage of the supporting capacitor is controlled to be increased based on the output voltage so that the energy transferred from the output end of the rectifying module to the supporting capacitor is increased, or the target voltage of the supporting capacitor is controlled to be decreased so that the energy transferred from the output end of the rectifying module to the supporting capacitor is decreased, so that the output voltage of the power take-off generator rectified by the rectifying module is kept stable.
The scheme is applied to the vehicle-mounted power generation system, the power take-off power generation system is a vehicle-mounted power generation system taking the power take-off power generator as a power source, the load carrying capacity of the power take-off power generator is in positive correlation with the rotating speed of the power take-off power generator, when the load connected with the power take-off power generator changes or the rotating speed of the power take-off power generator changes, due to the fact that the control characteristic of the output voltage of the power take-off power generator rectified by the rectifying module is poor, fluctuation of the output voltage of the power take-off power generator rectified by the rectifying module can be caused, the undervoltage protection point or the overvoltage protection point of the power take-off power generator is easy to reach, namely, the output voltage of the power take-off power generator rectified by the rectifying module is too low.
Considering that the capacity of the vehicle-mounted battery is small and limited, in order to supply power to the load by not using the vehicle-mounted battery frequently, namely to reduce the use of the vehicle-mounted battery, a voltage control method is designed to reduce the fluctuation of the output voltage of the power take-off generator rectified by the rectifying module, so that the stability of the output voltage of the power take-off generator rectified by the rectifying module is improved.
Specifically, the power take-off generator in the vehicle outputs three-phase alternating current, so the power take-off generator obtains the output voltage rectified by the rectifying module, and judges whether the output voltage is in the preset range of the output voltage or not based on the output voltage, namely whether the output voltage is too large or too small. When the output voltage is not within the preset range of the output voltage, namely when the output voltage of the power take-off generator is too large or too small, the target voltage of the support capacitor is controlled to be increased so that the energy transferred from the output end of the rectifier module to the support capacitor is increased, or the target voltage of the support capacitor is controlled to be decreased so that the energy transferred from the output end of the rectifier module to the support capacitor is decreased, namely the support capacitor is a virtual impedance, when the output voltage of the power take-off generator is larger than the preset output voltage, the support capacitor is a larger virtual impedance, and more energy can be absorbed; when the output voltage of the power take-off generator is smaller than the preset output voltage, the supporting capacitor is smaller virtual impedance, and less energy can be absorbed, so that the energy output to the load is stable.
Referring to fig. 2, fig. 2 is a schematic diagram of an experimental result of a voltage control method not used according to the present invention, in the experiment, when the rated output power of the power generator is 20kW, the load is 16kW, and the engine speed is increased from 1000RPM to 1300RPM, the output voltage of the power generator rectified by the rectification module fluctuates greatly. Referring to fig. 3, fig. 3 is a schematic diagram of an experimental result of a voltage control method according to the present invention, and under the same experimental conditions, fluctuation of an output voltage of a power take-off generator rectified by a rectifier module is significantly improved. Therefore, the output voltage fluctuation of the power take-off generator after being rectified by the rectifying module can be reduced, and the stability of the output voltage of the power take-off generator after being rectified by the rectifying module is improved.
The preset range in the present embodiment is 430V to 800V, and other preset ranges may be used, and the present application is not particularly limited herein.
In conclusion, when the output voltage of the power take-off generator rectified by the rectifying module fluctuates, the control target voltage is increased to increase the energy transferred from the output end of the rectifying module to the supporting capacitor, or the control target voltage is reduced to reduce the energy transferred from the output end of the rectifying module to the supporting capacitor, which is equivalent to adding a virtual impedance, so that the fluctuation of the output voltage of the power take-off generator rectified by the rectifying module can be reduced, the working stability of the power take-off generator is improved, and the use of a vehicle-mounted battery is reduced.
On the basis of the above-described embodiment:
as a preferred embodiment, a dc/dc conversion module is disposed between the rectification module and the support capacitor;
after the target voltage of the supporting capacitor is controlled to be increased or decreased based on the output voltage, the method further comprises the following steps:
generating a control signal based on the increased or decreased target voltage;
and outputting a control signal to the direct current/direct current conversion module to adjust the energy transferred from the output end of the rectification module to the support capacitor to increase or decrease.
The present embodiment aims to provide a way to control the energy transferred from the output end of the rectifier module to the support capacitor to increase or decrease, and specifically, generate a control signal based on the increased or decreased target voltage and output the control signal to the dc/dc conversion module, and the dc/dc conversion module adjusts the power absorbed by the support capacitor to increase or decrease based on the control signal.
It should be noted that the control signal may be, but is not limited to, a PWM (Pulse width modulation) signal generated based on the target voltage, and the dc/dc conversion module adjusts the energy value transferred from the output end of the rectification module to the support capacitor to a value corresponding to the PWM signal based on the PWM signal to reduce the fluctuation of the output voltage of the power take-off generator rectified by the rectification module. The dc/dc conversion module in the present application may be, but is not limited to, a Boost circuit. Referring to fig. 4, fig. 4 is a schematic diagram of a Boost circuit provided in the present invention, wherein the Boost circuit is composed of a switching tube Q, a diode D, and an inductor L.
Therefore, the mode provided by the application can realize the function of increasing or reducing the energy transferred from the output end of the output voltage control rectification module to the support capacitor, is simple and reliable, and is easy to realize.
As a preferred embodiment, before generating the control signal based on the increased or decreased target voltage, the method further includes:
acquiring actual voltages at two ends of a support capacitor;
generating a control signal based on the increased or decreased target voltage, comprising:
the control signal is generated based on a difference between the increased or decreased target voltage and the actual voltage.
Considering that the manner of directly generating the control signal based on the increased or decreased target voltage and then controlling the energy transferred from the output end of the rectifier module to the support capacitor to be increased or decreased is an open-loop control manner, control instability may occur.
In order to solve the technical problem, a closed-loop control mode is adopted in the application for energy transferred from the output end of the rectification module to the support capacitor, specifically, actual voltages at two ends of the support capacitor are further obtained, a control signal is generated according to a difference value between a target voltage and the actual voltages, and the direct current/direct current conversion module performs closed-loop regulation on the energy transferred from the output end of the rectification module to the support capacitor, so that the energy transferred from the output end of the rectification module to the support capacitor is stabilized at a value corresponding to the target voltage. Specifically, the value of the support capacitance in this application is 4950uF, and assuming that the target voltage is 760V, 10V is adjusted up and down. The increased energy transferred from the output of the rectifier module to the support capacitor is
Wherein E is the increased energy transferred from the output end of the rectifier module to the support capacitor, C is the support capacitance value, and V is1Is a target voltage, V2To support the actual voltage across the capacitor. When the dc/dc conversion module is a Boost circuit, the switching frequency of the switching tube in the dc/dc conversion module is 16KHz, and the corresponding switching time is 62.5us, then the speed of the actual voltage rise at the two ends of the supporting capacitor is 0.0225V/62.5 us-360V/s, that is, when the actual voltage change at the two ends of the supporting capacitor is 10V, 1/36s is used, and the increased power transferred from the output end of the rectification module to the supporting capacitor is P-E/T-37.8675-36-1.363 kW, where P is the increased power transferred from the output end of the rectification module to the supporting capacitor. Therefore, the supporting capacitor can play a role in absorbing redundant energy transferred by the rectifying module, and the cost of the capacitor is low.
In addition, the specific values of the support capacitor in the present application are not limited to the above examples, and the present application is not limited thereto.
In conclusion, the method and the device adopt a closed-loop control mode, and stability and reliability of controlling the energy transferred from the output end of the rectifier module to the support capacitor to be increased or reduced are improved.
As a preferred embodiment, controlling the target voltage of the supporting capacitor to increase or decrease based on the output voltage includes:
judging whether the output voltage is larger than the maximum value of a preset range or smaller than the minimum value of the preset range;
if the output voltage is larger than the maximum value of the preset range, controlling the target voltage of the support capacitor to increase;
and if the output voltage is smaller than the minimum value of the preset range, controlling the target voltage of the support capacitor to be reduced.
The present embodiment is directed to a specific implementation manner of how to control the target voltage of the support capacitor to increase or decrease, specifically, first, whether the output voltage is greater than a maximum value of a preset range or less than a minimum value of the preset range is determined, that is, whether the output voltage is within the preset range is determined. When the output voltage is judged to be larger than the maximum value of the preset range, controlling the target voltage of the support capacitor to increase; and when the output voltage is judged to be smaller than the minimum value of the preset range, controlling the target voltage of the support capacitor to be reduced. After that, generating a first control signal based on the increased target voltage and outputting the first control signal to the direct current/direct current conversion module, wherein the direct current/direct current conversion module controls the energy transferred from the output end of the rectification module to the support capacitor to increase based on the first control signal; or a second control signal is generated based on the reduced target voltage and is output to the direct current/direct current conversion module, the direct current/direct current conversion module controls the energy transferred from the output end of the rectification module to the support capacitor to be reduced based on the second control signal, so that the fluctuation of the output voltage of the power take-off generator rectified by the rectification module is reduced, and the stability of the output voltage of the power take-off generator rectified by the rectification module is improved.
As a preferred embodiment, obtaining the output voltage of the power take-off generator after being rectified by the rectifying module comprises:
and receiving the output voltage of the power take-off generator sent by the detection filtering module after rectification by the rectification module, wherein the filtering coefficient of the detection filtering module is greater than the corresponding filtering coefficient when the output voltage of the power take-off generator after rectification by the rectification module is stable. .
Considering that the output voltage of the power take-off generator rectified by the rectifying module cannot be obtained, and noise waves may appear in the obtained output voltage; therefore, the output voltage is sent through the detection filtering module and the output voltage is filtered to filter noise waves in the output voltage. Still consider that the output voltage of power takeoff generator after rectifier module rectification is undulant easily, in order to accelerate the speed that makes the output voltage of power takeoff generator after rectifier module rectification resume stable, the filtering degree of detection filter module in this application should not be too deep. Based on this, the filter coefficient in this application is greater than the corresponding filter coefficient when the output voltage of power takeoff generator after rectifier module rectification is stable. Specifically, the filter coefficient in this application is 0.2, and the corresponding filter coefficient is 0.01 when the output voltage of the power take-off generator rectified by the rectifier module is stable, that is, the filter coefficient is adjusted from 0.01 to 0.2 in this application, so as to accelerate the response speed, and the specific numerical value of the filter coefficient is not limited to the above example, and is not particularly limited in this application.
As a preferred embodiment, the method further comprises the following steps:
the power take-off generator controller receives the output voltage of the power take-off generator rectified by the rectifying module and outputs a motor control signal based on the output voltage to control the output voltage of the power take-off generator rectified by the rectifying module.
Specifically, the power take-off generator controller connected with the power take-off generator and the detection filter module is further arranged in the application, the power take-off generator controller is used for controlling the output voltage of the power take-off generator after being rectified by the rectifier module, so that the output voltage is kept stable, the application controls the output voltage of the power take-off generator after being rectified by the rectifier module based on the filtered output voltage, and the filter coefficient is larger than the filter coefficient when the output voltage is stable, so that the response speed of the power take-off generator for controlling the output voltage to recover stably is accelerated.
As a preferred embodiment, controlling the target voltage to increase based on the output voltage to increase the energy transferred from the output terminal of the rectifier module to the supporting capacitor includes:
and controlling the target voltage to be increased based on the output voltage and the maximum value of the energy absorbable by the support capacitor so as to increase the energy transferred from the output end of the rectifying module to the support capacitor.
Considering that the energy absorbable by the supporting capacitor is limited, when the target voltage is controlled to be increased so that the energy transferred from the output end of the rectifier module to the supporting capacitor is increased, the energy transferred from the output end of the corresponding rectifier module to the supporting capacitor when the target voltage is increased should not be larger than the maximum value of the energy absorbable by the supporting capacitor. Therefore, the target voltage is controlled to be increased based on the maximum value of the output voltage and the energy absorbable by the support capacitor, so that the energy transferred from the output end of the rectifier module to the support capacitor is increased, and the stability and the safety of the capacitor are guaranteed.
As a preferred embodiment, the method further comprises the following steps:
judging whether the output voltage is greater than an output voltage threshold value, wherein the output voltage threshold value is greater than the maximum value of a preset range;
if yes, the alarm device is controlled to give an alarm.
For the convenience of staff can in time know the unusual condition of power take-off generator power supply, this application still controls alarm device and reports to the police when output voltage is greater than the output voltage threshold value. Wherein, the alarm device can be one or the combination of a plurality of sound alarm device, vibration alarm device and light alarm device. Therefore, the mode that the control alarm device is used for alarming is convenient for workers to know the power supply state of the power take-off generator, the power take-off generator can be timely processed when power supply of the power take-off generator is abnormal, and the reliability of power supply of the power take-off generator is guaranteed.
As a preferred embodiment, there is a switch between the power take-off generator and the rectifier module, and the method further includes:
and when the output voltage is greater than the output voltage threshold value, the control switch is switched off.
Considering that the output voltage of the engine rectified by the rectifying module may be too large, for example, the power takeoff generator is out of control, so that the output voltage of the power takeoff generator rectified by the rectifying module cannot be supplied normally, and the load may be damaged. In order to solve the above technical problem, in the present application, when the output voltage is greater than the output voltage threshold, the power take-off generator is controlled to stop working, which may be that a switch between the power take-off generator and the rectifier module is turned off, or other implementation manners are also possible, for example, the power take-off generator controller controls the power take-off generator to stop outputting the voltage, and the present application is not limited specifically herein.
In conclusion, in the embodiment, when the fluctuation of the output voltage is large and larger than the threshold value of the output voltage, the power take-off generator stops supplying power, so that the load is prevented from being damaged, and the safety and the reliability of power supply of the power take-off generator are ensured.
Referring to fig. 5, fig. 5 is a block diagram of a voltage control system applied to a vehicle-mounted converter according to the present invention, including:
the power take-off generator is used for generating power by being linked with the vehicle engine;
the judging unit is used for judging whether the output voltage is within a preset range of the output voltage or not;
and the control unit is used for controlling the target voltage of the supporting capacitor to increase so as to increase the energy transferred from the output end of the rectifying module to the supporting capacitor or controlling the target voltage of the supporting capacitor to decrease so as to decrease the energy transferred from the output end of the rectifying module to the supporting capacitor based on the output voltage, so that the output voltage of the power take-off generator rectified by the rectifying module is kept stable.
For the introduction of the voltage control system, please refer to the above method embodiment, which is not described herein again.
Referring to fig. 6, fig. 6 is a block diagram of a voltage control apparatus according to the present invention, the apparatus includes:
a memory for storing a computer program;
and the processor is used for realizing the voltage control method when executing the computer program.
For the introduction of the voltage control device, please refer to the above method embodiment, which is not described herein again.
In order to solve the technical problem, the application further provides a vehicle-mounted converter, which comprises the voltage control device.
The vehicle-mounted converter in the present application may be, but is not limited to, a vehicle-mounted rectification inverter device, please refer to fig. 7, and fig. 7 is a block diagram of a structure of a vehicle-mounted rectification inverter device provided in the present invention. The vehicle-mounted rectification inverter device may include, but is not limited to, a filtering module 6, a rectifying module 7, a dc/dc conversion module 8, a capacitor 9, and an inverter module 10 in addition to the voltage control device. The filtering module 6 is used for filtering noise waves in alternating current output by the engine, the rectifying module 7 is used for converting the filtered alternating current into direct current, the direct current/direct current conversion module 8 is used for performing voltage regulation processing on the direct current rectified by the rectifying module 7, the capacitor 9 is used for reducing fluctuation of output voltage of the power take-off generator rectified by the filtering module 6 and the rectifying module 7, and the inverter module 10 is used for converting the direct current into the alternating current to supply power to a load.
For other descriptions of the vehicle-mounted converter provided by the present application, please refer to the above method embodiment, and the present application is not repeated herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.