阅读说明：本技术 一种高精度开关式电感测试仪 (high-precision switch type inductance tester ) 是由 谢准昌 田青青 谢孟洋 于 2018-07-20 设计创作，主要内容包括：本发明公开了一种高精度开关式电感测试仪,包括：主控制器电路、恒流源电路、开关电路以及检测电路；所述恒流源电路通过开关电路与电感连接,用于在所述主控制器电路控制下对所述电感进行充电和放电；所述检测电路输入端与所述开关电路连接,输出端与所述主控制器连接,用于将所述电感放电时的测量数据传输至所述主控制器电路；所述主控制器电路,用于接收所述检测电路传输来的所述测量数据,并进行分析和计算,从而得出所述电感的感值。本发明采用开关方式控制恒流源双向电感充放,利用电感恒压放电时电流线性变化这一特点,通过测量电感放电的时间从而计算出电感的感值,方法独特,具有很高的创新价值。(The invention discloses a high-precision switch type inductance tester, which comprises a main controller circuit, a constant current source circuit, a switch circuit and a detection circuit, wherein the constant current source circuit is connected with an inductor through the switch circuit and used for charging and discharging the inductor under the control of the main controller circuit, the input end of the detection circuit is connected with the switch circuit, the output end of the detection circuit is connected with the main controller and used for transmitting measurement data during the discharge of the inductor to the main controller circuit, and the main controller circuit is used for receiving the measurement data transmitted by the detection circuit and analyzing and calculating the measurement data to obtain an inductance value of the inductor.)

1, kinds of high-precision switch-type inductance tester, which is characterized in that the tester comprises a main controller circuit, a constant current source circuit, a switch circuit and a detection circuit;

the constant current source circuit is connected with the inductor through a switch circuit and is used for charging and discharging the inductor under the control of the main controller circuit;

the input end of the detection circuit is connected with the switch circuit, and the output end of the detection circuit is connected with the main controller and is used for transmitting the measurement data during the discharge of the inductor to the main controller circuit;

and the main controller circuit is used for receiving the measurement data transmitted by the detection circuit, analyzing and calculating the measurement data, and obtaining the inductance value of the inductor.

2. The high accuracy switched inductor tester of claim 1 further comprising a human-machine interaction module for displaying an inductance value of said inductor.

3. The high precision switch-mode inductance tester according to claim 1, wherein the human-computer interaction module uses a touch screen LCD as a display interface for human-computer interaction and an interface for human-computer operation, and is used for selecting different inductance types and collecting and measuring unknown inductance parameters in measurement.

4. The high accuracy switched inductor tester of claim 1 further comprising a data storage module in circuit connection with said main controller for storing different types of inductor calculation data formulas.

5. The high accuracy switched inductor tester of claim 1 further comprising a power module in circuit connection with said main controller.

6. The high accuracy switched inductance tester of claim 1 further comprising a driver circuit connected to said switching circuit.

Technical Field

The invention relates to the technical field of electronics, in particular to high-precision switch type inductance testing methods.

Background

The inductor is an element capable of converting electric energy into magnetic energy and storing the magnetic energy, and is also called a choke, a reactor and a dynamic reactor, the inductor is used for preventing the change of current, if no current passes through the inductor, the inductor prevents the current from flowing through the inductor, if the current flows through the inductor, the inductor tries to maintain the current unchanged when the circuit is disconnected, the inductor has the characteristic of preventing alternating current from passing through and allowing direct current to pass through smoothly, the higher the frequency is, the higher the coil impedance is, therefore, the inductor is mainly used for isolating and filtering alternating current signals or forming a resonance circuit with a capacitor, a resistor and the like, the inductor is applied in an electronic circuit, and the inductor is used for which is the main element for realizing oscillation, tuning, coupling, filtering, delaying, trapping and the like in the circuit and also has the functions of filtering signals, filtering noise, stabilizing current, suppressing electromagnetic wave interference and the like.

The inductor still measures inductance under the original sine wave excitation and only can measure a coil with the inductor being a fixed value, but the inductor is mostly used for a DC-DC switching power supply at present and works in a switching state instead of a sine state, so that better test methods for reflecting the switching characteristic of the inductor are needed at present.

Disclosure of Invention

In order to solve the problems in the prior art, the embodiment of the invention provides high-precision switch-type inductance testers, which comprises the following steps:

, it provides kinds of high-precision switch inductance tester, including main controller circuit, constant current source circuit, switch circuit and detection circuit;

the constant current source circuit is connected with the inductor through a switch circuit and is used for charging and discharging the inductor under the control of the main controller circuit;

the input end of the detection circuit is connected with the switch circuit, and the output end of the detection circuit is connected with the main controller and is used for transmitting the measurement data during the discharge of the inductor to the main controller circuit;

and the main controller circuit is used for receiving the measurement data transmitted by the detection circuit, analyzing and calculating the measurement data, and obtaining the inductance value of the inductor.

Optionally, the system further comprises a human-computer interaction module for displaying the inductance value of the inductor.

Optionally, the human-computer interaction module uses a touch screen LCD as a display interface for human-computer interaction and an interface for human-computer operation, and is used for selecting different inductance types and collecting and measuring unknown inductance parameters during measurement.

Optionally, the inductance calculation device further comprises a data storage module, which is connected with the main controller circuit and used for storing different types of inductance calculation data formulas.

Optionally, the system further comprises a power module, which is connected with the main controller circuit.

Optionally, the display device further comprises a driving circuit connected with the switch circuit.

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

(1) the constant current source bidirectional inductor is controlled to charge and discharge in a switching mode, the inductance value of the inductor is calculated by measuring the discharge time of the inductor by utilizing the characteristic of linear change of current during constant-voltage discharge of the inductor, and the method is unique and has high innovation value.

(2) The chip of the ARM single chip microcomputer is STM32, the main frequency can reach 72MHz, and the measurement resolution is very high.

(3) The design is simple, small in size, convenient to operate, low in cost, fast, have very strong interference killing feature, relative measurement accuracy is 2%, and have fine integratibility.

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 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 diagram of high-precision switched-inductor testers according to an embodiment of the present invention;

fig. 2 is a software flow chart of kinds of high-precision switch-mode inductance testers according to the embodiment of the invention.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in further with reference to the accompanying drawings.

The invention provides high-precision switch-type inductance testers, which are shown in figure 1 and comprise a main controller circuit 100, a constant current source circuit 200, a switch circuit 300 and a detection circuit 400;

the constant current source circuit 200 is connected to an inductor 500 through a switch circuit 300, and is configured to charge and discharge the inductor 500 under the control of the main controller circuit 100;

the input end of the detection circuit 400 is connected to the switch circuit 300, and the output end is connected to the main controller, and is configured to transmit the measurement data during the inductor discharging to the main controller circuit 100;

the main controller circuit 100 is configured to receive the measurement data transmitted by the detection circuit 400, and analyze and calculate the measurement data, so as to obtain an inductance value of the inductor.

Specifically, in this embodiment, STM32 is selected as the main control chip in the main controller circuit 100, which is a 32-bit microcontroller, ARM Cortex M3 core, whose maximum frequency is 72MHz, which has 128kb flash memory, 20kb ram, which has 100 pins, channels of PWM output, which is distinguished as 16 bits, which has 16 12-bit analog-to-digital converters, and the Atmega16 single chip microcomputer can meet the technical requirements of the present subject from the viewpoint of usability and economy.

Optionally, a human-computer interaction module 600 is further included, configured to display an inductance value of the inductor 600.

Optionally, the human-computer interaction module 600 uses a touch screen LCD as a display interface for human-computer interaction and an interface for human-computer operation, and is used for selecting different inductance types and collecting and measuring unknown inductance parameters during measurement.

Optionally, a data storage module 700 is further included, connected to the main controller circuit 100, for storing different types of inductance calculation data formulas.

Specifically, the data storage module 700, i.e., the EEPROM, is an AT24C256 with an I2C interface, is a 265K bit serial electrically erasable programmable read only memory produced by ATMEL corporation, is packaged by 8-pin double-row direct insertion, has the characteristics of compact structure, large storage capacity, and the like, can be directly interfaced with an I2C bus of an ARM, and is used for storing different types of inductance calculation data formulas to prevent signal data loss due to system power failure.

Optionally, a power module 800 is further included, coupled to the main controller circuit 100.

Optionally, a driving circuit 900 is further included, and is connected to the switching circuit 300.

In addition, the present embodiment also provides software simulation and fitting curves of kinds of high-precision switch-type inductance testers, and specifically, MATLAB is used for data fitting and simulation, analysis is performed on experimental results, and a logical relation formula of the inductor Lx with different types to be measured is obtained according to the measured tD and the measured internal resistance r.

The embodiment also provides an algorithm logic design of high-precision switch type inductance testers, and specifically, the software design of the system adopts a modular programming idea, each module program is written by using C language, and is independently debugged, and then the relation between the modules is established to enable the modules to work in a coordinated manner.

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

(1) the constant current source bidirectional inductor is controlled to charge and discharge in a switching mode, the inductance value of the inductor is calculated by measuring the discharge time of the inductor by utilizing the characteristic of linear change of current during constant-voltage discharge of the inductor, and the method is unique and has high innovation value.

(2) The chip of the ARM single chip microcomputer is STM32, the main frequency can reach 72MHz, and the measurement resolution is very high.

(3) The design is simple, small in size, convenient to operate, low in cost, fast, have very strong interference killing feature, relative measurement accuracy is 2%, and have fine integratibility.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, that is, may be located in places, or may be distributed on a plurality of network units.

Based on the understanding that the above technical solutions essentially or contributing to the prior art can be embodied in the form of a software product that can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing computer devices (which may be personal computers, servers, or network devices, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.