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An overcurrent protection circuit

An overcurrent protection circuit, overcurrent protection technology, applied in emergency protection circuit devices, protections that respond to overcurrents, circuit devices, etc., can solve the problems of inability to achieve protection and slow response speed.

Active Publication Date: 2021-08-24
河南嘉晨智能控制股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the over-current protection is realized by software, the over-current protection point can be easily adjusted, but the response speed is slow, at least on the order of milliseconds
Therefore, it is indispensable to implement overcurrent protection through hardware, but adjusting the resistor divider ratio may lead to the inability to realize the protection function under low temperature conditions

Method used

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Embodiment Construction

[0026] A detailed description will be given below in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the present invention provides an overcurrent protection circuit for realizing overcurrent protection of a power MOSFET, at least including a voltage sampling circuit, a comparator Comp1 and a pull-up resistor R4. The positive input terminal of the comparator Comp1 is connected with the voltage sampling circuit. The negative input terminal of the comparator Comp1 is connected to the reference voltage Vref. The output terminal of the comparator Comp1 is connected to the pull-up resistor R4. A thermistor R-NTC is connected between the first voltage dividing resistor R1 and the second voltage dividing resistor R2 of the voltage sampling circuit. The thermistor R-NTC is connected in parallel with the second voltage dividing resistor R2 and is connected in series with the first voltage dividing resistor R1 to divide the voltage.

[0028] Preferab...

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PUM

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Abstract

The invention relates to an overcurrent protection circuit with temperature compensation, which at least includes a voltage sampling circuit, a comparator and a pull-up resistor, the positive input terminal of the comparator is connected to the voltage sampling circuit, and the negative input terminal is connected to a reference voltage , and the output terminal of the comparator is connected to the pull-up resistor, a thermistor is connected between the first voltage dividing resistor and the second voltage dividing resistor of the voltage sampling circuit, and the thermistor is connected to the first voltage dividing resistor The two voltage dividing resistors are connected in parallel and are connected in series with the first voltage dividing resistor to divide the voltage. Through this setting method, overcurrent protection can be realized under low temperature conditions by adjusting the ratio of resistor voltage division.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an overcurrent protection circuit with temperature compensation. Background technique [0002] The overcurrent protection circuit is usually designed in the application of the power circuit. When the comparator is designed as the overcurrent protection circuit, the voltage change in the circuit needs to be sampled. The application scenario of a power Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) is taken as an example for illustration. The advantage of the MOSFET is that the driving circuit is simple, the driving current required by the MOSFET is relatively small, and it can usually be directly driven by a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or an open-collector TTL driving circuit. Moreover, MOSFET has no charge storage effect, its switching is relatively fast, and it can work at a faster speed. In ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/12H02H3/00H02H3/08
CPCH02H3/006H02H3/085H02H7/1203
Inventor 武凯李飞姚欣
Owner 河南嘉晨智能控制股份有限公司
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