A power supply output overcurrent and overvoltage protection device and anti-interference method thereof
A technology of overcurrent and overvoltage protection and power output, which is applied in the field of power supply to achieve the effects of improving the reliability of overvoltage protection, improving the reliability of overcurrent protection, and improving reliability
Active Publication Date: 2018-05-04
CHONGQING MAS SCI & TECH CO LTD
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[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is how to solve the problem of how electromagnetic interference affects the normal operation of the overcurrent and overvoltage protection of the power supply, and provide a power supply output overcurrent and overvoltage protection device and its anti-interference method
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[0022] Example: see figure 1 A power supply output overcurrent and overvoltage protection device includes an input interface part, a main power supply part, a current sampling circuit, a voltage sampling circuit, a reference voltage part, a control logic part, an output switch part and an output interface part. The current sampling circuit includes a positive side current sampling circuit for collecting the positive current of the output terminal of the main power supply part and a negative side current sampling circuit for collecting the negative current of the output terminal of the main power supply part; A positive side current sampling resistor and a negative side current sampling resistor are connected in series, the positive side current sampling circuit collects the voltage at both ends of the positive side current sampling resistor, and the negative side current sampling circuit collects the voltage at both ends of the negative side current sampling resistor; correspo...
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The invention discloses a power supply output overcurrent and overvoltage protection device and an anti-interference method thereof. The overcurrent and overvoltage protection device includes an input interface part, a main power supply part, a current sampling circuit, a voltage sampling circuit, a reference voltage part, a control Logic part, output switch part, and output interface part; the control process of the power output anti-interference method is as follows: 1) When the positive and negative sampling currents flow simultaneously, the control logic part immediately outputs a shutdown signal to the output switch part; 2 ) When the positive side voltage and the negative side voltage are overvoltage at the same time, the control logic part immediately outputs a shutdown signal to the output switch part. The invention can avoid the influence of electromagnetic interference on the power supply, so that the output of the power supply is more stable and reliable.
Description
technical field [0001] The invention relates to the field of power supplies, in particular to a power supply output overcurrent and overvoltage protection device and an anti-interference method thereof. Background technique [0002] The power supply is a device that supplies power to electrical equipment. Most of the current power supplies are mainly composed of voltage conversion circuits, filter circuits, overvoltage and overcurrent protection circuits, and switching circuits. At present, coal mine power supply safety barriers have relatively high voltage and current protection requirements due to coal mine-related regulations. Now it is generally used to detect overcurrent and overvoltage on one side of the power supply, and its anti-interference performance is low. Contents of the invention [0003] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is how to solve the problem of how electromagnetic interference affects th...
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IPC IPC(8): H02H7/10H02H3/26
Inventor 王征章建马焰叶立胜全太锋
Owner CHONGQING MAS SCI & TECH CO LTD