Polyphase power supply protection circuit

Abstract

A polyphase power supply protection circuit. The polyphase power supply protection circuit includes a temperature detection circuit, a controller and a pulse width modulator, wherein the temperature detection circuit transmits detected temperature to the controller, the controller takes the average of received temperature values, the temperature values detected by the temperature detection circuit are compared with the average value, a deviation value is obtained, an absolute value of the deviation value is compared with a preset value, and the controller outputs a control signal to the pulse width modulator according to a comparison result. The pulse width modulator outputs a plurality of pulse width modulating signals having different duty ratios according to the control signal output by the controller to adjust supply circuits, thereby avoiding frequent adjustment of current of a polyphase power supply in the prior art, and ensuring stability of the polyphase power supply.

Description

technical field [0001] The invention relates to a multi-phase power supply protection circuit. Background technique [0002] At present, in a multi-phase power supply, a certain phase power supply circuit often generates a large amount of heat due to an excessive current flowing through the phase power supply circuit. The previous multi-phase power supply protection circuit used an NTC (Negative Temperature Coefficient, negative temperature coefficient) thermistor to detect the temperature of the power supply circuit. Changes to indirectly reflect changes in temperature, but the use of NTC thermistors cannot accurately detect the temperature of the multi-phase power supply circuit, nor can it set a reasonable temperature deviation range, so this may cause frequent adjustments to the multi-phase power supply. Adjusting the current size of the multi-phase power supply system affects the stability of the multi-phase power supply system to a certain extent. Contents of the in...

AI Technical Summary

Problems solved by technology

[0002] At present, multi-phase power supply often generates a lot of heat due to the excessive current flowing through a certain phase power supply circuit.

The previous multi-phase power supply protection circuit used an NTC (Negative Temperature Coefficient, negative temperature coefficient) thermistor to detect the temperature of the power supply circuit. Changes to indirectly reflect changes in temperature, but the use of NTC thermistors cannot accurately detect the temperature of the multi-phase power supply circuit, nor can it set a reasonable temperature deviation range, so this may cause frequent adjustments to the multi-phase power supply. The current size is adjusted, which affects the stability of the multi-phase power supply system to a certain extent.

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