Auxiliary power source bootstrapping circuit of power source converting device

Abstract

The invention discloses an auxiliary power source bootstrapping circuit of a power source converting device, comprising an input filtering capacitor, a surge protection resistor, a surge protection switch, a bootstrapping charging resistor, a bootstrapping energy storage capacitor and an auxiliary power source. One end of the input filtering capacitor is connected with a high-voltage input positive end while the other end of the input filtering capacitor is connected with a common end of the surge protection switch; a normally-opened point of the surge protection switch is connected with a high-voltage input negative end; the surge protection resistor is connected in parallel between the common point and the normally-opened point of the surge protection switch; one end of the bootstrapping charging resistor is connected with a normally-closed point of the surge protection switch; the other end of the bootstrapping charging resistor is connected with one end of the bootstrapping energystorage capacitor; the other end of the bootstrapping energy storage capacitor is connected with a high-voltage input negative end; and a control power supply end of the auxiliary power source is connected in parallel at the two ends of the bootstrapping energy storage capacitor. The auxiliary power source bootstrapping circuit of the power source converting device has the advantages of reducing the power consumption and the occupation space and improving the reliability.

Description

technical field [0001] The invention relates to an auxiliary power supply bootstrap circuit, which is suitable for auxiliary power supply bootstrap startup occasions in various medium and high-power power conversion devices. Background technique [0002] In all kinds of medium and high-power power conversion devices, the auxiliary power supply is used as the power supply of the control circuit. When the device is started, the auxiliary power supply must first realize the bootstrap start, and then the device can be started. Such as figure 1 Shown is a typical auxiliary power supply bootstrap start-up and anti-surge circuit of a power conversion device. The schematic diagram of the auxiliary power supply is shown in the dotted line box. First, the high voltage is input to charge the input filter capacitor (C1) and C2 through resistors R1 and R2 respectively. , when the voltage of C2 reaches the starting voltage of the auxiliary power controller, the auxiliary power starts to ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of large power consumption, large space occupation and poor reliability of the auxiliary power supply bootstrap circuit of the existing power conversion device, the present invention provides an auxiliary power supply of a power conversion device that reduces power consumption, reduces space occupation and improves reliability bootstrap circuit

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