Energy taking circuit used in series with power module equalizing resistor

Abstract

The invention relates to an energy taking circuit used in series with a power module equalizing resistor. A capacitor positive pole of a power unit is taken as a voltage input end HVin, and two powersupply power sources VOUT1 and VOUT2 are outputted. A voltage equalizing resistor, a first full control switching device, a rectifier diode, a first voltage sampling circuit, a driving circuit, a starting circuit, a starting capacitor, a storage capacitor, a second voltage sampling circuit, a main control circuit, a power conversion circuit and a power supply diode are included. The energy takingcircuit is independent of an original energy taking power source on a power module, when the original energy taking power source fails, standby power supply can be provided for a bypass contactor trigger circuit of the power unit to ensure reliable implementation of the contactor bypass action. The energy taking circuit is connected with a power unit capacitor after being connected in series withthe equalizing resistor, voltage withstanding levels of a full control device and the storage capacitor are reduced, and design convenience is high. The energy taking circuit is advantaged in that thecircuit principle is concise, reliability is high, the VOUT1 and VOUT2 dual power source output function is achieved, and flexible application is achieved.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an energy harvesting circuit used in series with a voltage equalizing resistor of a power module. Background technique [0002] The bridge arm of the MMC flexible direct current transmission converter valve, the cascaded reactive power compensation device, the cascaded active filter device, the inverter unit of the cascaded high-voltage frequency conversion device, and the main part of the chopper unit of the cascaded DC power supply device The loop structure is composed of many power units in series. When the power module fails, it should be able to bypass reliably to ensure the continuous operation of the equipment. [0003] At present, the power supply of the secondary board of the power unit traditionally adopts the method of directly extracting energy from the capacitor of the power unit. Due to the complex principle and large size of the energy acquisition power s...

AI Technical Summary

Problems solved by technology

When the energy harvesting power supply fails, the power unit cannot be controlled, and the entire device needs to be powered off before it can be manually bypassed, which will have a serious impact on the operation of the device

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