Polyphase power supply protection circuit

A multi-phase power supply and protection circuit technology, which is applied to emergency protection circuit devices, circuit devices, and automatic disconnection emergency protection devices, etc., can solve the problem that the temperature deviation range cannot be set and the multi-phase power supply circuit cannot be accurately detected temperature, affecting the stability of the multi-phase power supply system, etc., to avoid regulation and ensure stability

Inactive Publication Date: 2015-09-23
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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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.

Method used

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  • Polyphase power supply protection circuit

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Embodiment Construction

[0010] Please refer to figure 1 , a preferred embodiment of the multi-phase power supply protection circuit of the present invention is used to protect a multi-phase power supply. The power supply protection circuit includes a temperature detection circuit 10 , a controller 20 and a pulse width modulator 30 . In this embodiment, the multi-phase power supply includes a three-phase power supply circuit 40 .

[0011] The temperature detection circuit 10 includes three digital temperature sensors U. In this embodiment, the model of each digital temperature sensor U is DS18B20. Each digital temperature sensor U includes a power input pin VCC, a ground pin GND and a digital signal output pin DQ. The ground terminal of each digital temperature sensor U is grounded, and the power supply terminal VCC is connected to a power supply. Each digital temperature sensor U is placed near a corresponding electronic component (such as a capacitor, a transistor (MOSFET)) included in a correspo...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H5/04
Inventor 孙东晖
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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