Resistance output circuit

A technology for output circuits and resistors, applied in circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., can solve problems affecting the accuracy of resistor output circuits, and achieve the elimination of overcurrent The influence of the internal resistance of the pressure protector and the effect of improving the accuracy

Inactive Publication Date: 2009-05-20
SUPCON GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the overcurrent and overvoltage protection device itself has a certain internal resistance, and its resistance value will change with the change of circuit current and ambient temperature, thus affecting the accuracy of the entire resistance output circuit

Method used

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  • Resistance output circuit
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Embodiment Construction

[0023] Overcurrent and overvoltage protectors are often used in circuit design to protect the internal components of the circuit from being damaged under overvoltage and overcurrent conditions. Generally, an overcurrent and overvoltage protector is directly connected in series in the circuit, but No matter what kind of overcurrent and overvoltage protection device itself has a certain internal resistance, and its resistance value will change with the change of circuit current and ambient temperature, which will affect the output accuracy of the circuit. This has become a high-precision resistance output circuit. A key constraint on the design.

[0024] The basic idea of ​​the invention is to use the voltage clamping unit to clamp the voltage, and utilize the principle of virtual short and virtual break of the operational amplifier to eliminate the influence of the internal resistance of the overcurrent and overvoltage protector.

[0025] Please refer to figure 2 , is a schem...

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Abstract

Resistance output circuit includes structures: A-end of over current and over voltage protector (OCOVP) is connected to the output end, and B-end through first protective resistance (PR) is connected to the output end of first operational amplifier (OA); second PR is connected to connection line between inverted input end and output end of OA; connection port of first voltage clamping unit (VCU) is connected to connection line between first PR and first OCOVP; one end of the gain amplifier (GA) is connected to non-invert input end of first OA, and the other end to second OA; non-invert input end of second OA is connected to ground, and the invert input end through second OCOVP is connected to the input end; one end of third PR is connected to input end, and the other end is connected to connection line between fourth PR and GA, and the connection port of second VCU is connected to the connection line. The invention is in use for eliminating influence of internal resistance of OCOVP.

Description

technical field [0001] The invention relates to an overcurrent and overvoltage protection technology, in particular to a resistance output circuit for eliminating the influence of the internal resistance of an overcurrent and overvoltage protection device. Background technique [0002] In the design of resistance output circuits, it is usually used to directly connect an overcurrent and overvoltage protector in series in the circuit to protect the internal components of the circuit from being damaged in the case of overcurrent and overvoltage, such as figure 1 As shown, the circuit includes an input terminal, an output terminal, an internal circuit and an overcurrent and overvoltage protection device, and the overcurrent and overvoltage protection device is connected in series on the connection line between the input terminal and the output terminal. Because the overcurrent and overvoltage protection device itself has a certain internal resistance, and its resistance value w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/02H02H3/08H02H3/20H03H11/00
Inventor 李堂忠丁云单明星
Owner SUPCON GRP
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