CN203084175U - Constant current electronic load tester - Google Patents
Constant current electronic load tester Download PDFInfo
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- CN203084175U CN203084175U CN 201320094886 CN201320094886U CN203084175U CN 203084175 U CN203084175 U CN 203084175U CN 201320094886 CN201320094886 CN 201320094886 CN 201320094886 U CN201320094886 U CN 201320094886U CN 203084175 U CN203084175 U CN 203084175U
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Abstract
The utility model discloses a constant current electronic load tester which comprises a filter protection circuit, a constant current load circuit, a voltage acquisition circuit, a controller, a voltage output circuit, a reference voltage circuit, a keyboard display circuit and a serial interface circuit. According to the constant current electronic load tester, a PIC18 series single-chip microcomputer is adopted as the core, the set current value for constant current testing is set through a button and the display circuit, and accurate and stable constant current testing is realized through the cooperation of a high-precision instrument amplifier, a high-resolution serial analog-to-digital and digital-to-analog converter and a constant current circuit. In addition, communication with a computer can be realized for remote monitoring and control through an RS232 interface circuit. In addition, the tester has the advantages of simple circuit, low cost and the like.
Description
Technical field
The utility model belongs to the proving installation technical field, particularly relates to a kind of constant current electronics load testing instrument.
Background technology
In the output characteristics of measuring direct supply or when carrying out endurancing, traditional method is to utilize fixed resistance and variohm to serve as tested load.This method of testing has the following disadvantages: the variation range of test voltage is very big, and it is very complicated that the connection of load will become; In test process, because raising, load temperature causes load variations, need to adjust in real time the load size; And electric current can't be accomplished continuous variation, as accumulator is carried out discharge test, because the terminal voltage because of battery descends in the discharge process of accumulator, and makes discharge current progressively reduce, thereby is difficult to measure the discharge electricity amount of accumulator.
The constant current electronic load is a kind of by absorbing the electric energy that power supply provided, and simulates or replaces equipment true, static load with constant current value, is a kind of adjustable Constant Current Load.Electronic load has solved in the traditional test needs manual shift to cause the low problem of control accuracy with fixed resistance and variohm, the load in also can simulation true environment.Such as, generally the relatively stricter producer of power requirement is used the quality that electronic load detects power supply, in order to test or regulating load size, and short circuit, overcurrent, dynamic dispatching operating condition.Simultaneously, in the test of some instrument and meters, also carry out the test of dynamic load with the constant current electronic load.
Constant current electronics load testing instrument is a kind of test load that utilizes the constant current electronic load to serve as power supply to be measured, and the constant current electronic load is connected with computing machine; Utilize computer control control constant current electronic load, constitute the load of the required specification of test according to the demand of test, and utilize the computer-automatic collection test data, thus the high precision int and the robotization of realization power supply test.
Summary of the invention
In order to address the above problem, the utility model purpose is to provide a kind of control accuracy height, circuit constant current electronics load testing simple, with low cost.
In order to achieve the above object, the constant current electronics load testing instrument that provides of the utility model comprises: filter protective circuit, Constant Current Load circuit, voltage collection circuit, controller, voltage follower circuit, reference voltage circuit, keyboard-display circuit and serial interface circuit; Wherein:
Filter protective circuit is connected between power supply to be measured and the Constant Current Load circuit, is made up of input filter and input protection unit;
The Constant Current Load circuit provides the test Constant Current Load for power supply to be measured, and it adopts amplifier driven MOS power tube multistage " cascade " to expand the stream mode, the independent control of each grade;
Two input ends of voltage collection circuit are connected with reference voltage circuit with the Constant Current Load circuit respectively, its output terminal is connected with controller, mainly be made up of voltage amplifier and analog to digital converter two parts, wherein, voltage amplifier is made up of instrument amplifier and analog switch;
Controller is made of microcontroller chip, it is connected with voltage follower circuit, the voltage digital amount that is used for collecting is converted into current value, the current setting value of itself and constant current test is compared, then the digital to analog converter transmitting control commands in voltage follower circuit;
The input end of voltage follower circuit is connected with controller, output terminal is connected with the Constant Current Load circuit, mainly constitute by digital to analog converter, it converts the control order that receives to corresponding output voltage values, the size of current of each grade makes the total current value equal the current setting value of constant current test substantially in the control Constant Current Load circuit;
Reference voltage circuit is the reference voltage chip, it is connected with voltage follower circuit with voltage collection circuit respectively, be used to analog to digital converter and the digital to analog converter in the voltage follower circuit in the voltage collection circuit that 2.5V reference voltage source accurately is provided, to guarantee the stability and the accuracy of constant current control;
Keyboard-display circuit is made up of button and display, and it is connected with microcontroller, is mainly used in current value, the test duration of setting the constant current test and shows various state parameters;
Serial interface circuit is the RS232 interface circuit, and it is connected with controller, and the Transistor-Transistor Logic level conversion of signals that is used for controller is sent becomes the RS232 level signal, and direct then and PC computing machine carries out communication.
Among the Constant Current Load circuit, the model of described MOS power tube is IRFP260.
Described controller adopts the PIC18F4520 microcontroller.
Described controller is connected with analog to digital converter in the voltage collection circuit 3 by the SPI interface that carries.
The model of reference voltage chip is ADR421 in the described reference voltage circuit.
Among described voltage collection circuit, it is the modulus conversion chip of AD7718 that analog to digital converter adopts model, and the model of instrument amplifier is AD620, and the model of analog switch is CD4051.
The constant current electronics load testing instrument that the utility model provides is to be core with the PIC18 series monolithic, by button and display circuit the current setting value that constant current is tested is set, cooperates high-precision meter amplifier, high-resolution serial modulus and digital to analog converter and constant-current circuit to realize the accuracy and the stability of constant current test.In addition, utilize the RS232 interface circuit to realize remote monitoring control with the computing machine communication.In addition, this tester also has advantages such as circuit is simple, with low cost.
The result of use of the constant current electronics load testing instrument that the utility model provides is as follows:
1, adopting the PIC18F4520 single-chip microcomputer is the main control chip, possesses high efficient and the extremely strong anti-interference carried out.
2, form the ADC voltage collection circuit by 24 multi-channel high-accuracy modulus conversion chip AD7718 and low cost, high-precision meter amplifier AD620, cooperate accurate sampling resistor to convert the real-time current value in the constant current test process to the voltage digital amount exactly, and compare the voltage collection circuit of forming with the chip of price, on acquisition precision, be greatly improved.
3, the DAC voltage follower circuit is selected 16 lower powered voltage output analog-digital chip DAC7631 of serial for use, has guaranteed high control precision when having realized low power operation.
4, computing machine can be observed every state parameter of constant current electronic load by the RS232 interface circuit and the current setting value that constant current is tested can be set.But there are shortcomings such as control accuracy is poor, circuit complexity, cost height in constant current electronics load testing instrument commonly used at present.
Description of drawings
The constant current electronics load testing instrument composition frame chart that Fig. 1 provides for the utility model.
Voltage collection circuit schematic diagram in the constant current electronics load testing instrument that Fig. 2 provides for the utility model.
Constant Current Load circuit theory diagrams in the constant current electronics load testing instrument that Fig. 3 provides for the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the constant current electronics load testing instrument that the utility model provides is elaborated.
As shown in Figure 1, the constant current electronics load testing instrument that provides of the utility model comprises: filter protective circuit 1, Constant Current Load circuit 2, voltage collection circuit 3, controller 4, voltage follower circuit 5, reference voltage circuit 6, keyboard-display circuit 7 and serial interface circuit 8; Wherein:
Filter protective circuit 1 is connected between power supply 9 to be measured and the Constant Current Load circuit 2, form by input filter and input protection unit, input filter is used to make the output waveform of power supply 9 to be measured more level and smooth, the input protection unit possesses short-circuit protection and overload protection function, therefore can improve the reliability and the security of test;
Constant Current Load circuit 2 provides the test Constant Current Load for power supply 9 to be measured, as shown in Figure 3, it adopts amplifier driven MOS power tube multistage " cascade " to expand the stream mode, each level can independently be controlled, in order to improve control accuracy, adopt the output voltage of voltage follower circuit 5 to unify control, in addition, the MOS power tube is crossed cause thermal damage when preventing high-current test, is fixed with heat radiator and fan at its back side so that heat radiation and cooling;
Two input ends of voltage collection circuit 3 are connected with reference voltage circuit 6 with Constant Current Load circuit 2 respectively, and its output terminal is connected with controller 4; Voltage collection circuit 3 mainly is made up of voltage amplifier and analog to digital converter two parts, as shown in Figure 2, wherein, the voltage amplifier of being made up of instrument amplifier and analog switch possesses five ranges, the selection of range is realized by the control analog switch by controller 4, it can carry out the magnitude of voltage at the sampling with high precision resistance two ends in the constant-current circuit amplification of appropriateness, sends analog to digital converter then to; Analog to digital converter carries out the AD conversion to the magnitude of voltage of input, is about to voltage analog and converts digital quantity to, then digital signal is sent to controller 4;
The input end of voltage follower circuit 5 is connected with controller 4, output terminal is connected with Constant Current Load circuit 2, voltage follower circuit 5 mainly is made of digital to analog converter, it becomes corresponding output voltage values with controller 4 command conversion that receive, the size of current of each grade makes the total current value equal the current setting value of constant current test substantially in the control Constant Current Load circuit 2; Make the closed-loop path that is constituted by Constant Current Load circuit 2, voltage collection circuit 3, controller 4 and voltage follower circuit 5 form closed-loop control, thereby the constant current test is achieved;
Keyboard-display circuit 7 is made up of button and display, and it is connected with microcontroller 4, is mainly used in current value, the test duration of setting the constant current test and shows various state parameters;
Among Constant Current Load circuit 2, the model of described MOS power tube is IRFP260.
Described controller 4 adopts PI C18F4520 microcontroller.
Described controller 4 is connected with analog to digital converter in the voltage collection circuit 3 by the SPI interface that carries.
The model of reference voltage chip is ADR421 in the described reference voltage circuit 6.
Among described voltage collection circuit 3, it is the modulus conversion chip of AD7718 that analog to digital converter adopts model, and the model of instrument amplifier is AD620, and the model of analog switch is CD4051.
In addition, on described PC computing machine 10, can utilize upper computer software (for example VB or LabVIEW etc.) coding, to realize remote monitoring control constant current electronics loaded work piece.
The specific operation process of the constant current electronics load testing instrument that the utility model provides is:
1, selects the power supply that meets Instrument specification for use, power on after the affirmation.
2, before connecting power supply 9 to be measured, check every state parameter of instrument earlier.
3, set the current setting value of the constant current test of instrument by the input media on button on the keyboard-display circuit 7 or the PC computing machine 10.
4, connect power supply 9 beginning constant current tests to be measured.
Claims (6)
1. constant current electronics load testing instrument, it is characterized in that: described constant current electronics load testing instrument comprises: filter protective circuit (1), Constant Current Load circuit (2), voltage collection circuit (3), controller (4), voltage follower circuit (5), reference voltage circuit (6), keyboard-display circuit (7) and serial interface circuit (8); Wherein:
Filter protective circuit (1) is connected between power supply to be measured (9) and the Constant Current Load circuit (2), is made up of input filter and input protection unit;
Constant Current Load circuit (2) provides the test Constant Current Load for power supply to be measured (9), and it adopts amplifier driven MOS power tube multistage " cascade " to expand the stream mode, the independent control of each grade;
Two input ends of voltage collection circuit (3) are connected with reference voltage circuit (6) with Constant Current Load circuit (2) respectively, its output terminal is connected with controller (4), mainly form by voltage amplifier and analog to digital converter two parts, wherein, voltage amplifier is made up of instrument amplifier and analog switch;
Controller (4) is made of microcontroller chip, it is connected with voltage follower circuit (5), the voltage digital amount that is used for collecting is converted into current value, the current setting value of itself and constant current test is compared, then the digital to analog converter transmitting control commands in voltage follower circuit (5);
The input end of voltage follower circuit (5) is connected with controller (4), output terminal is connected with Constant Current Load circuit (2), mainly constitute by digital to analog converter, it becomes corresponding output voltage values with controller (4) command conversion that receives, the size of current of each grade in the control Constant Current Load circuit (2) makes the total current value equal the current setting value of constant current test substantially;
Reference voltage circuit (6) is the reference voltage chip, it is connected with voltage follower circuit (5) with voltage collection circuit (3) respectively, be used to analog to digital converter in the voltage collection circuit (3) and the digital to analog converter in the voltage follower circuit (5) that 2.5V reference voltage source accurately is provided, to guarantee the stability and the accuracy of constant current control;
Keyboard-display circuit (7) is made up of button and display, and it is connected with microcontroller (4), is mainly used in current value, the test duration of setting the constant current test and shows various state parameters;
Serial interface circuit (8) is the RS232 interface circuit, and it is connected with controller (4), is used for the Transistor-Transistor Logic level conversion of signals that controller (4) sends is become the RS232 level signal, and direct then and PC computing machine (10) carries out communication.
2. constant current electronics load testing instrument according to claim 1 is characterized in that: among Constant Current Load circuit (2), the model of described MOS power tube is IRFP260.
3. constant current electronics load testing instrument according to claim 1 is characterized in that: described controller (4) adopts the PIC18F4520 microcontroller.
4. constant current electronics load testing instrument according to claim 1 is characterized in that: described controller (4) is connected with analog to digital converter in the voltage collection circuit (3) by the SPI interface that carries.
5. constant current electronics load testing instrument according to claim 1 is characterized in that: the model of reference voltage chip is ADR421 in the described reference voltage circuit (6).
6. constant current electronics load testing instrument according to claim 1, it is characterized in that: among described voltage collection circuit (3), it is the modulus conversion chip of AD7718 that analog to digital converter adopts model, and the model of instrument amplifier is AD620, and the model of analog switch is CD4051.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320094886 CN203084175U (en) | 2013-03-01 | 2013-03-01 | Constant current electronic load tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320094886 CN203084175U (en) | 2013-03-01 | 2013-03-01 | Constant current electronic load tester |
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| CN203084175U true CN203084175U (en) | 2013-07-24 |
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| CN 201320094886 Expired - Lifetime CN203084175U (en) | 2013-03-01 | 2013-03-01 | Constant current electronic load tester |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412191A (en) * | 2013-08-26 | 2013-11-27 | 甘肃农业大学 | Minitype resistance measurement system |
| CN103698562A (en) * | 2013-12-26 | 2014-04-02 | 艾德克斯电子（南京）有限公司 | Electronic load device and simulation method thereof |
| CN104569855A (en) * | 2015-01-08 | 2015-04-29 | 珠海许继电气有限公司 | Automatic testing system for power supply |
| CN105700611A (en) * | 2016-03-18 | 2016-06-22 | 重庆长安汽车股份有限公司 | Adjustable constant current electronic load |
| CN107528298A (en) * | 2017-09-11 | 2017-12-29 | 深圳传音制造有限公司 | The protection circuit and electronic load of electronic load |
| CN107884606A (en) * | 2017-12-15 | 2018-04-06 | 安阳普莱电子照明有限公司 | A kind of electronic load device and the method using electronic load device Test driver |
| CN108303586A (en) * | 2017-10-20 | 2018-07-20 | 博众精工科技股份有限公司 | A kind of power test device |
| CN109975586A (en) * | 2019-04-12 | 2019-07-05 | 西安太乙电子有限公司 | A kind of constant current electronic load circuit and its working method |
| CN111044825A (en) * | 2019-12-28 | 2020-04-21 | 广东盈科电子有限公司 | Tester for testing 220V load and direct-current voltage |
| CN114325462A (en) * | 2022-01-04 | 2022-04-12 | 成都泰盟软件有限公司 | Intelligent detection device and method for USB charging device |
-
2013
- 2013-03-01 CN CN 201320094886 patent/CN203084175U/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103412191A (en) * | 2013-08-26 | 2013-11-27 | 甘肃农业大学 | Minitype resistance measurement system |
| CN103412191B (en) * | 2013-08-26 | 2015-07-01 | 甘肃农业大学 | Minitype resistance measurement system |
| CN103698562A (en) * | 2013-12-26 | 2014-04-02 | 艾德克斯电子（南京）有限公司 | Electronic load device and simulation method thereof |
| CN103698562B (en) * | 2013-12-26 | 2016-03-16 | 艾德克斯电子（南京）有限公司 | A kind of electronic load device and emulation mode thereof |
| CN104569855A (en) * | 2015-01-08 | 2015-04-29 | 珠海许继电气有限公司 | Automatic testing system for power supply |
| CN105700611A (en) * | 2016-03-18 | 2016-06-22 | 重庆长安汽车股份有限公司 | Adjustable constant current electronic load |
| CN107528298A (en) * | 2017-09-11 | 2017-12-29 | 深圳传音制造有限公司 | The protection circuit and electronic load of electronic load |
| CN107528298B (en) * | 2017-09-11 | 2020-08-14 | 深圳传音制造有限公司 | Protection circuit of electronic load and electronic load |
| CN108303586A (en) * | 2017-10-20 | 2018-07-20 | 博众精工科技股份有限公司 | A kind of power test device |
| CN107884606A (en) * | 2017-12-15 | 2018-04-06 | 安阳普莱电子照明有限公司 | A kind of electronic load device and the method using electronic load device Test driver |
| CN109975586A (en) * | 2019-04-12 | 2019-07-05 | 西安太乙电子有限公司 | A kind of constant current electronic load circuit and its working method |
| CN109975586B (en) * | 2019-04-12 | 2021-08-24 | 西安太乙电子有限公司 | Constant-current electronic load circuit and working method thereof |
| CN111044825A (en) * | 2019-12-28 | 2020-04-21 | 广东盈科电子有限公司 | Tester for testing 220V load and direct-current voltage |
| CN111044825B (en) * | 2019-12-28 | 2022-05-17 | 广东盈科电子有限公司 | Tester for testing 220V load and direct-current voltage |
| CN114325462A (en) * | 2022-01-04 | 2022-04-12 | 成都泰盟软件有限公司 | Intelligent detection device and method for USB charging device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: TIANJIN JINNENG YIANTAI TECHNOLOGY CO., LTD. Free format text: FORMER NAME: TIANJIN EMPIRETEST CORPORATION |
|
| CP03 | Change of name, title or address |
Address after: 300384 Huayuan Industrial Zone Tianjin City Road No. 10 Patentee after: TIANJIN JINNENG YIANTAI TECHNOLOGY CO.,LTD. Address before: 300384 Tianjin city Nankai District Huayuan Science Park Haitai development six 6 Haitai green industry base 3 door 301 seat M8 Patentee before: TIANJIN EMPIRETEST Corp. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20130724 |
|
| CX01 | Expiry of patent term |