Energy feedback type AC/DC electronic load simulator

Abstract

The invention discloses an electronic load simulation device, in particular to an electronic load simulation device which is universal for AC and DC, can realize arbitrary load characteristic simulation, and an energy feedback type electronic load simulation device. The device takes a two-stage PWM inverter with a common DC bus as the core Composition, the input stage PWM inverter is connected to the power supply under test through the input filter inductor to form the load characteristic simulation part of the electronic load; the output stage PWM inverter is connected to the power grid through the isolation transformer and the output filter inductor to form the energy feedback part of the electronic load; The characteristic simulation part and the energy feedback part are independent of each other in control. The load characteristic simulation adopts a single current instantaneous value control method to control the amplitude and waveform of the input load current, and the energy feedback adopts a voltage and current double closed-loop control method including a phase-locked loop. Controlling the waveform of the output network side current and the DC side bus voltage, the invention has small loss and high power factor of the network side, and is an energy-saving AC and DC universal electronic load simulation device.

Description

technical field [0001] The invention relates to an electronic load simulation device, in particular to an energy-saving AC / DC universal electronic load simulation device which realizes arbitrary load characteristic simulation and energy feedback grid through a power electronic conversion circuit. Background technique [0002] Various types of AC power supplies and DC power supplies need to be tested on-load during the R&D process or before the products leave the factory to test the electrical performance of the power supply. There are two ways to form the load: one is composed of passive components such as resistors, inductors, capacitors, etc. This is the most traditional form of load. This kind of load has the following disadvantages: [0003] 1) It is inconvenient to adjust the parameters of the load size, and it is not easy to control accurately; [0004] 2) The stability of the load size and parameters is not high, and it changes with the change of the load temperature...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide an electronic load solution in order to overcome the shortcomings of the existing electronic loads, such as the lack of versatility, the inability to simulate linear loads with any power factor, and large power consumption.

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