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Current-limiting circuit

A technology of current limiting circuit and power circuit, which is applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve the problems of high production cost, numerous circuit components, and low accuracy of current limiting value, so as to improve reliability and save energy. The effect of high precision of electric energy and current limit value

Active Publication Date: 2015-03-18
QINGDAO EASTSOFT COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention designs a current-limiting circuit for the problems of complex structure, numerous circuit elements, high production cost, positive temperature coefficient, and low accuracy of current-limiting value.

Method used

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Embodiment Construction

[0013] A current limiting circuit of the present invention, such as Figures 2 to 3 As shown, it includes two current sampling resistors R38 and R39 connected in parallel, filter capacitor C26 connected to the output terminal, current limiting transistor Q7, control transistor Q8, control switch transistor Q9, current limiting transistor Q7 and control transistor Q8 are PNP transistors , the control switch transistor Q9 is an NPN transistor.

[0014] The filter capacitor C26 is grounded; the base of the current-limiting transistor Q7 is connected to the collector of the control transistor Q8; the collector of the current-limiting transistor Q7 is connected to the output terminal; the emitter of the current-limiting transistor Q7 is connected to the output terminal VCC of the power supply circuit; the control transistor The base of Q8 is connected to the output terminal VCC of the power supply circuit, and the third voltage dividing resistor R37 is connected in series therebetw...

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PUM

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Abstract

The invention relates to a current-limiting circuit. The current-limiting circuit comprises sampling resistors, a filtering capacitor, a current-limiting triode, a control triode and a control switch triode, wherein the filtering capacitor is connected with an output end. A base electrode of the current-limiting triode is connected with a collector electrode of the control triode, an emitting electrode of the current-limiting triode is connected with a power circuit output end, and a collector electrode of the current-limiting triode is connected with the output end. A base electrode of the control triode is connected with the power circuit output end, and an emitting electrode of the control triode is connected with a +12V power supply. The sampling resistors are connected between the power circuit output end and the +12V power supply, an emitting electrode of the control switch triode is grounded, a base electrode of the control switch triode is connected with an enable signal end, a current-limiting resistor is serially connected between the base electrode of the control switch triode and the enable signal end, a collector electrode of the control switch triode is connected with the base electrode of the current-limiting triode, a voltage-dividing resistor is serially connected between the collector electrode of the control switch triode and the base electrode of the current-limiting triode, the collector electrode of the control triode is connected with the +12V power supply, and a voltage-dividing resistor is serially connected between the collector electrode of the control triode and the +12V power supply. A current-limiting value of the current-limiting circuit does not fluctuate along with change of voltage and is high in precision. Besides, the current-limiting circuit has the negative temperature coefficient characteristic, the current-limiting value is decreased along with temperature increase of the circuit, and accordingly electric energy is saved.

Description

technical field [0001] The invention relates to a current limiting circuit, in particular to a current limiting circuit used in a low-voltage power line carrier communication module. Background technique [0002] The currently known current limiting circuit has complex circuit structure, numerous circuit components, high production cost, positive temperature coefficient, and low accuracy of current limiting value. [0003] Such as figure 1 The current limiting circuit in the carrier module is shown, the function of the current limiting circuit is to limit the maximum current consumption of the carrier module to +12V, if the current amplification factor of the triode is H FE =300, the limited output current should not exceed 156mA, when the circuit enters the current limiting mode, the triode V3 will heat up, and the temperature will rise, resulting in the current amplification factor of the triode H FE Increase, so that the output current becomes larger, the temperature of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 王宪贤傅涛崔健胡亚军王锐张旭华聂廷卫周健胡云
Owner QINGDAO EASTSOFT COMM TECH
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