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A Constant Current Type High Power Electronic Load Control Circuit

A technology of electronic load and control circuit, which is applied in the direction of control/adjustment system, adjustment of electric variables, instruments, etc., and can solve problems such as poor system stability, system instability, oscillation of drive signal and current waveform, etc.

Active Publication Date: 2015-11-25
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the gate parasitic capacitance of IGBT is many times larger than that of MOSFET. When used as a constant current electronic load, if the traditional control method (such as attached figure 2 As shown), the obtained drive signal and current waveform oscillate, and the system stability is poor
If the control loop is not designed for stability, it is easy to cause system instability

Method used

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  • A Constant Current Type High Power Electronic Load Control Circuit
  • A Constant Current Type High Power Electronic Load Control Circuit
  • A Constant Current Type High Power Electronic Load Control Circuit

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] Constant current electronic load is the most commonly used mode in the use of electronic load, the basic principle diagram is attached figure 1 As shown, the transistor (MOSFET / IGBT) is connected to the power supply under test and consumes the power of the power supply under test. After the sampling voltage of the transistor is amplified by the amplifier circuit, it is compared with the voltage of the control signal through the comparator to obtain the driving signal. The driving signal output by the comparator The signal drives the transistor to work.

[0018] The control circuit of the traditional constant current electronic load, as attached figure 2 As shown, the collector of the IGBT is connected to the power supply under test. The voltage of the emitter of the IGBT is sampled through the sampling resistor, and compared with the ...

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Abstract

The invention provides a constant-current high-power electronic load control circuit and aims to solve the problem that the system is unstable due to the fact that an existing constant-current high-power electronic load control circuit is easy to vibrate. A driving level circuit is added between an original control circuit and an IGBT (insulated gate bipolar translator) power circuit, and a compensation link circuit is added on the original control circuit, so that by reasonable compensation parameter design, the constant-current high-power electronic load control circuit is stable, and stable working of loops under affection of IGBT parasitic parameters is guaranteed.

Description

technical field [0001] The invention relates to the field of electronic load control, in particular to a control circuit of an electronic load. Background technique [0002] The working principle of the electronic load is to control the driving level of the internal power MOSFET or transistor, and rely on the power tube to work in the linear region to dissipate power. It is an indispensable device for testing switching power supplies. Constant current electronic load is the most commonly used mode in the use of electronic load, the basic principle diagram is attached figure 1 shown. [0003] When the processing power reaches several kilowatts, the use of MOSFETs requires multiple groups of parallel connections, and the reliability of the equipment is likely to decrease. At this time, it is more appropriate to use the insulated gate bipolar transistor IGBT. However, the gate parasitic capacitance of IGBT is many times larger than that of MOSFET. When used as a constant curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/625
Inventor 张东来陈琦张晓峰刘贺曲璐金珊珊
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL