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Overcurrent protection circuit

An overcurrent protection circuit and overcurrent technology, applied in the direction of overcurrent protection, current/voltage measurement, and electrical variable measurement, can solve problems such as circuit system or electronic equipment damage, and achieve low cost effects

Inactive Publication Date: 2012-04-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for some circuits with large current to perform the overcurrent protection function, which also leads to damage to the circuit system or electronic equipment

Method used

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Examples

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Embodiment Construction

[0018] Such as figure 1 As shown, the common-mode voltage differential amplifier circuit 1 for detecting current is composed of a detection resistor and an INA117 high common-mode differential amplifier U1. The overcurrent discrimination circuit 2 is composed of No. 1 resistor R1, No. 1 capacitor C1 and comparator U3. The voltage level conversion and timing circuit 3 is composed of two No. 3 resistors R3 and No. 4 resistor R4, No. 2 capacitor C2 and No. 3 capacitor C3, and NE555 timer U2. Alarm circuit 4 is composed of No. 5 resistor R5, No. 1 transistor Q1 and buzzer LS. Photocoupler circuit 5 is composed of No. 6 resistor R6, No. 7 resistor R7, No. 4 capacitor C4, No. 5 capacitor C5, and photocoupler U4 . The totem pole circuit 6 is composed of No. 8 resistor R8, No. 9 resistor R9, No. 6 capacitor C6 and No. 7 capacitor C7, an NPN transistor Q2 and a PNP transistor Q3. The MOSFET turn-off circuit 7 is composed of No. 10 resistor R10, No. 11 resistor R11 and No. 12 resisto...

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PUM

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Abstract

The invention discloses an overcurrent protection circuit. A common mode voltage differential amplification circuit converts the acquired current value into a common mode voltage value; an overcurrent judgment circuit compares the common mode voltage value with a reference value; a voltage high-low converting and timing circuit outputs different voltage values to an alarm circuit and a photoelectric isolation circuit according to the comparison results, and a photoelectric coupler is switched on when the photoelectric isolation circuit receives low level and is switched off when the photoelectric isolation circuit receives high level; a totem-pole circuit is connected with a photoelectric coupling circuit; and an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) turnoff circuit is connected with a protected device or an electronic circuit. The overcurrent protection circuit is low in cost, and the maximal detection current can reach 200A, so that the electronic circuit or electronic equipment can be ensured to work safely.

Description

technical field [0001] The invention relates to an overcurrent protection circuit. Background technique [0002] In electronic circuit technology, especially in power supply technology, people pay more and more attention to the overcurrent protection of the system, which can ensure the reliable and stable operation of the system. In the actual electronic circuit system, when the system is over-current, the circuit cannot be used normally, and the whole system will be damaged if it is serious. In addition, once the system has a short circuit, it is very likely that the entire electronic circuit system will be burned out, causing economic losses and prolonging the system development cycle. In motor control, long-term overcurrent of the motor will cause the motor coil to burn out. In order to protect these electronic circuits or devices, an overcurrent protection circuit system must be added. [0003] Some equipment or electronic circuit systems in the prior art are installed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08G01R19/165
Inventor 李声晋王严伟卢刚周勇周广伟李鑫张松松魏世克杨静伟
Owner NORTHWESTERN POLYTECHNICAL UNIV
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