A kind of energy consumption AC electronic load and its working method

Abstract

The invention belongs to the field of power and electronic devices and particularly relates to an energy consumption type alternating-current electronic load. The electronic load comprises an alternating-current contactor, an alternating-current input filter inductor, an inverter bridge, a direct-current side capacitor, a chopping module, an energy consumption resistor, a detection module and a control module. The alternating-current contactor, the alternating-current input filter inductor, a first end and a second end of the inverter bridge and a to-be-measured power source form a circuit. A third end and a fourth end of the inverter bridge and the direct-current side capacitor form a circuit, and the chopping module and the energy consumption resistor are connected with the two ends of the direct-current side capacitor in series. The control module and the inverter bridge are connected with the chopping module, connection and disconnection of the inverter bridge and the chopping module are correspondingly controlled according to measured voltage and current values and preset parameters, and accordingly input current and power factors of the to-be-measured power source can be freely set; the voltage of the direct-current side capacitor is stably controlled, redundant energy is consumed, and the electronic load is simple in circuit structure and low in cost. The invention also discloses a work method of the electronic load.

Description

Technical field [0001] The invention belongs to the field of power electronic equipment, and specifically relates to an energy-consuming AC electronic load and a working method thereof. Background technique [0002] With the development of power electronic technology, a large number of power electronic power supplies are used, and higher and more accurate requirements are put forward for the testing of power electronic power supplies. The traditional power supply test generally uses a fixed resistive inductive load, and its power factor and output current cannot be set arbitrarily, and cannot be adapted to the accurate test of the power supply. [0003] Most of the existing electronic loads adopt a grid-connected energy feedback structure. The advantage of this method is that it can save energy. However, in some remote areas or special occasions, because there is no power grid or the power grid does not allow energy feedback, this type of electronic load cannot be used. [0004] Ene...

AI Technical Summary

Problems solved by technology

The traditional power supply test generally adopts a fixed resistive inductive load, and its power factor and output current cannot be set arbitrarily, which cannot adapt to the precise test of the power supply.

[0003] Most of the existing electronic loads adopt a grid-connected energy feedback structure. The advantage of this method is that it can save energy. However, in some remote areas or special occasions, because there is no power grid or the power grid does not allow energy feedback, this type of electronic load cannot be used.

[0004] Energy-consuming AC electronic loads generally use back-to-back power electronic converters, and the converters connected to the side of the power supply under test generally need to adopt a dual-loop control method of the DC bus voltage outer loop and the AC filter inductor current inner loop to track the output current of the power supply under test. , the controller design of this control method is complex and the system is not easy to be stable

There are also some types of electronic loads that consume energy by controlling the power consumption of multiple parallel-connected power devices (such as transistors or MOSFETs) working in the linear amplification region. Although this type of electronic load can be made into an energy-consuming load, its The energy consumption of a single power device is limited, and it requires a relatively complex and numerous drive circuit. It is not easy to make a high-power electronic load and the system is complex and costly. In addition, this type of electronic load has a fatal flaw that it can only adjust the load The size of the current, but the power factor of the load current cannot be adjusted

Images