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Overvoltage/overcurrent protection circuit

An overvoltage and overcurrent protection and circuit technology, which is applied in the protection of overcurrent and overvoltage, etc., can solve the problems of damaged diodes and anti-overvoltage diode protection, etc., to achieve low cost, prevent Damaged, simple material effects

Active Publication Date: 2013-02-20
PHICOMM (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an overvoltage and overcurrent protection circuit to solve the technical problem that the above-mentioned anti-overvoltage diode cannot be protected for a long time, and the diode will be damaged when the overvoltage does not disappear or when the overvoltage is very high

Method used

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  • Overvoltage/overcurrent protection circuit

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Embodiment Construction

[0015] The present invention will be further described below in combination with principle diagrams and specific operation examples.

[0016] like figure 1 As shown, the overvoltage and overcurrent protection circuit of the present invention includes a resettable fuse F3, a triac U4, a three-terminal adjustable shunt reference source U13, a first resistor R45, a second resistor R57 and a third resistor R93, and the resettable fuse Pin 1 of F3 is connected to the input voltage Vin, pin 2 is connected to pin 2 of the first resistor R45, pin 1 of the first resistor R45 is connected to pin 1 of the three-terminal adjustable shunt reference source U13, and pin 1 of the first resistor R45 is connected to a bidirectional Pin 3 of the thyristor U4, pin 1 of the triac U4 are connected to pin 2 of the first resistor R45, and pin 2 of the first resistor R45 outputs the voltage Vout. The bidirectional thyristor U4 and the three-terminal adjustable shunt reference source U13 play the role...

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Abstract

The invention discloses an overvoltage / overcurrent protection circuit which comprises a resettable fuse, a bidirectional triode thyristor, three-terminal adjustable shunt reference source, a first resistor, a second resistor and a third resistor, wherein a pin 1 of the resettable fuse is connected with input voltage and a pin 2 of the resettable fuse is connected with a pin 2 of the first resistor; a pin 1 of the first resistor is connected with a pin 1 of the three-terminal adjustable shunt reference source; the pin 1 of the first resistor is also connected with a pin 3 of the bidirectional triode thyristor; a pin 1 of the bidirectional triode thyristor is connected with the pin 2 of the first resistor; the pin 2 of the first resistor is used for outputting voltage; a pin 8 of the three-terminal adjustable shunt reference source is connected with a pin 1 of the second resistor; the pin 1 of the second resistor is connected with a pin 2 of the third resistor; and a pin 2 of the second resistor is used for outputting voltage. The circuit disclosed by the invention well converts overvoltage into overcurrent, and the equipment can be prevented from being damaged by long-time overvoltage / overcurrent.

Description

technical field [0001] The invention relates to integrated circuits, in particular to an overvoltage and overcurrent protection circuit. Background technique [0002] In the use of electronic products, it is often encountered in the case of circuit overcurrent (severe like a short circuit). At this time, the design usually connects a resettable fuse in series with the power input terminal for overcurrent protection, while the input When the voltage is too high, a TVS diode is generally used for overvoltage control, but this anti-overvoltage diode cannot be used for long-term protection. When the overvoltage does not disappear or the overvoltage is high, it will also damage the diode, thereby affecting Subsequent circuits cause devastating damage. Contents of the invention [0003] The purpose of the present invention is to provide an overvoltage and overcurrent protection circuit to solve the technical problem that the above-mentioned anti-overvoltage diode cannot be prot...

Claims

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Application Information

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IPC IPC(8): H02H3/20H02H3/08
Inventor 鲁灿
Owner PHICOMM (SHANGHAI) CO LTD
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