Self-supply circuit and method for power semiconductor switch drive circuit

Abstract

The invention belongs to the field of electrical drive circuits, and aims to provide a self-supply circuit and method for a power semiconductor switch drive circuit; the circuit of the invention includes a power semiconductor switch and its drive circuit, a step-down rectifier circuit, a battery charging and discharging circuit, a filter Capacitor and isolation conversion voltage stabilization circuit, the step-down rectification circuit is connected to both ends of the main circuit of the power semiconductor switch, the step-down rectification circuit, battery charging and discharging circuit, isolation conversion voltage stabilization circuit, and filter capacitor are connected in sequence, and the isolation conversion voltage stabilization circuit The circuit adopts module isolation; the positive and negative poles of the drive circuit are respectively connected to the positive and negative poles of the filter capacitor, and the negative pole of the drive circuit is connected to the common ground of the power semiconductor switch negative pole. The beneficial effects of the invention are: no electromagnetic components are required to provide driving power, and the isolation ability is strong; the voltage output by the step-down rectifier circuit supplies power while charging the battery; the backup battery can provide emergency power supply to ensure the safe shutdown of the equipment; the optical fiber transmits pulse signals in one direction, Line interference is small.

Description

technical field [0001] The invention belongs to the field of electric drive circuits, and in particular relates to a self-supply circuit and method for a power semiconductor switch drive circuit. Background technique [0002] The energy-saving application of power electronic equipment is getting wider and wider, and the capacity is getting bigger and bigger, so the voltage level is getting higher and higher. Such as high-power induction heating power supply, medium and high voltage inverter, high voltage DC power transmission and transformation, etc. Since the power semiconductor switch works in a fast switching state, the rapid change of high voltage and large current is the main source of interference for power electronic equipment. To ensure the stable operation of the equipment, the drive circuit of the device is very critical. The operating voltage of the drive circuit is relatively low, and it is also the connection channel between the high-voltage main circuit and th...

AI Technical Summary

Problems solved by technology

Both drive methods use electromagnetic conversion elements (pulse transformer and drive power transformer), so it is easy to cause bidirectional transmission of interference, and the isolation capability is also limited, which is not conducive to improving the working voltage

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