In-parallel sampling over-current protection circuit

A technology of overcurrent protection circuit and sampling circuit, which is applied in the direction of electrical components, output power conversion devices, etc., can solve the problems of poor consistency, unfavorable mass production, and increased temperature rise of devices, so as to achieve simple and easy circuit and facilitate mass production , the effect of channel current reduction

Active Publication Date: 2012-11-28
BEIJING KEYTONE ELECTRONICS RELAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the series sampling resistor increases the power consumption, the greater the control current, the greater the power consumption, resulting in an increase in the temperature rise of the device during normal operation, which has a certain impact on the reliability of the device
[0004] 1. The series sampling method increases the power consumption, thereby increasing the temperature rise of the device. In the application, the heat dissipation requirements are higher, and the product consistency

Method used

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Examples

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Example Embodiment

[0032] Example one

[0033] Such as figure 1 Shown is the circuit diagram of the parallel sampling overcurrent protection circuit of the first embodiment of the present invention. This invention is used inside a solid-state relay or a solid-state power controller, and specifically includes:

[0034] The temperature drift suppression circuit includes: a first resistor R1, a first thermistor RT1, a second resistor R2, a second thermistor RT2, and an operational amplifier OAMP; a parallel sampling circuit includes: a first switch tube Q1, a second thermal resistor The sensitive resistor RT2 and the second resistor R2; the output power component is composed of N second switching tubes in parallel. In this embodiment, as a preference, N=2 is selected, that is, two second switching tubes are connected in parallel, respectively Q2 and Q3; reference input terminal Ref, first output terminal Vout1 and second output terminal Vout2.

[0035] In the temperature drift suppression circuit, the fi...

Example Embodiment

[0043] Example two

[0044] Such as figure 2 Shown is a circuit diagram of a parallel sampling overcurrent protection circuit according to the second embodiment of the present invention. This invention is used inside a solid state relay or a solid state power controller, and specifically includes:

[0045] The temperature drift suppression circuit includes: a first resistor R1, a first thermistor RT1, a second resistor R2, a second thermistor RT2, and an operational amplifier OAMP; a parallel sampling circuit includes: a first switch tube Q1, a second thermal resistor The sensitive resistor RT2 and the second resistor R2; the output power component is composed of N second switching tubes in parallel. In this embodiment, as a preference, N=3 is selected, that is, three second switching tubes are connected in parallel, Q2, Q3 and Q4; reference input terminal Ref, first output terminal Vout1 and second output terminal Vout2.

[0046] In the temperature drift suppression circuit, the f...

Example Embodiment

[0054] Example three

[0055] Such as image 3 Shown is a circuit diagram of a parallel sampling overcurrent protection circuit of the third embodiment of the present invention. This invention is used inside a solid state relay or a solid state power controller, and specifically includes:

[0056] The temperature drift suppression circuit includes: a first resistor R1, a first thermistor RT1, a second resistor R2, a second thermistor RT2, and a comparator; a parallel sampling circuit includes: a first switch tube Q1, a second thermistor The resistance RT2 and the second resistance R2; the output power component is composed of N second switching tubes in parallel. In this embodiment, as a preference, N=1, that is, a second switching tube Q2; refer to the input terminals Ref and the first switching tube. An output terminal Vout1 and a second output terminal Vout2.

[0057] In the temperature drift suppression circuit, the first terminal of the first resistor R1 is connected to the re...

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Abstract

The invention discloses an in-parallel sampling over-current protection circuit. The in-parallel sampling over-current protection circuit comprises a temperature-drift suppression circuit, an in-parallel sampling circuit, an output power component, a reference input end, a first output end and a second output end, wherein the temperature-drift suppression circuit consists of a first resistor, a first thermistor, a second resistor, a second thermistor and an operation amplifier; the in-parallel sampling circuit consists of a first switching tube, another second thermistor and a second resistor; the output power component is formed by N second switching tubes in a parallel connection manner; output current flows through the first output end and the second output end; when the output current is overlarge, voltage of a second input end of the operation amplifier is higher than voltage of a first input end, the signal level of the output end of the operation amplifier is changed, the first switching tube and the second switching tubes are disconnected to realize over-current protection; and the temperature-drift suppression circuit carries out compensation by the first thermistor and the second thermistor, and by voltage distribution between the first resistor and the first thermistor and voltage distribution between the second resistor and the second thermistor, a proportional relation is formed, and flexible adjustment of over-current protection points is realized.

Description

technical field [0001] The present invention relates to an overcurrent protection circuit, more specifically, to a parallel overcurrent sampling protection circuit with temperature stability and low power consumption, which can be used inside a solid-state relay or a solid-state power controller to realize overcurrent at the output end Protect. Background technique [0002] Usually, the overcurrent protection circuit of the solid state relay or the solid state power controller adopts the method of series sampling resistor. The disadvantage of this method is that the series sampling resistor increases the power consumption, the greater the control current, the greater the power consumption, resulting in an increase in the temperature rise of the device during normal operation, which has a certain impact on the reliability of the device. Therefore, various overcurrent sampling circuits have been developed in the prior art for overcurrent protection of devices. [0003] Among...

Claims

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Application Information

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IPC IPC(8): H02M1/32
Inventor 闫军政赵钢吴维刚董海建
Owner BEIJING KEYTONE ELECTRONICS RELAY
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