Anti-oscillation overvoltage protection circuit
An overvoltage protection circuit and resistor technology, applied in emergency protection circuit devices, protections that respond to overvoltage, circuit devices, etc., can solve problems such as damage to electronic devices, continuous switching and oscillation of power output terminals, and achieve good protection. effect of action
Pending Publication Date: 2020-01-10
WUXI SHENGJING ELECTRONICS TECH CO LTD
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Problems solved by technology
[0002] In the process of using electronic devices, the power supply plays a vital role, but due to improper operation or other reasons, it may cause overvoltage problems, so it is necessary to design an overvoltage protection circuit. Although the traditional overvoltage protection circuit can play a role When the voltage is too high to cut off the circuit protection, but when the input voltage is at the critical value of the overvoltage protection components, there will be oscillations of the power supply output switching continuously, thus damaging the electronic devices
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[0018] The specific embodiments of the present invention will be described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
[0019] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.
[0020] Such as figure 1 As shown, the anti-oscillation overvoltage protection circuit is used in the power supply part. The power supply includes an input port IN_V and an output port Safety_V, including a primary voltage stabilization unit 1, a secondary voltage stabilization unit 2, and a working Unit 3 and control unit 4, the primary voltage stabilizing unit 1 is connected to the power input port IN_V and the secondary voltage stabilizing unit 2, the secondary volt...
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The invention discloses an anti-oscillation overvoltage protection circuit. The overvoltage protection circuit is used for a power supply part of a power supply. The power supply comprises an input port IN_V and an output port Safety_V. The circuit comprises a first-stage voltage stabilizing unit, a second-stage voltage stabilizing unit, a working unit and a control unit, wherein the first-stage voltage stabilizing unit is connected with the power supply input port IN_V and the second-stage voltage stabilizing unit; the second-stage voltage stabilizing unit, the working unit and the control unit are connected in sequence, the output end of the control unit is connected with the power supply output port Safety_V; and the voltage stabilizing value of the first-stage voltage stabilizing unitis larger than that of the second-stage voltage stabilizing unit. Thus, the phenomenon that the output end of the circuit is continuously switched on and off at a voltage critical value can be avoided, and after the voltage is reduced to below the voltage value of the voltage stabilizing diode D2, the power supply of the power supply can be self-recovered, so that electronic devices can be well protected.
Description
Technical field: [0001] The invention belongs to the technical field of power supply protection, in particular to an anti-oscillation overvoltage protection circuit. Background technique: [0002] In the process of using electronic devices, power supply plays a vital role, but due to improper operation or other reasons, overvoltage problems may be caused, so it is necessary to design an overvoltage protection circuit. Although the traditional overvoltage protection circuit can play a role When the voltage is too high to cut off the circuit protection, but when the input voltage is at the critical value of the overvoltage protection components, there will be oscillations of the power supply output switching continuously, thus damaging the electronic devices. [0003] The information disclosed in this Background section is only for enhancing the understanding of the general background of the present invention and should not be taken as an acknowledgment or any form of suggesti...
Claims
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IPC IPC(8): H02H1/04H02H3/20H02H3/06
CPCH02H1/04H02H3/06H02H3/20
Inventor 徐海芳罗志怡赵先锋张永刚
Owner WUXI SHENGJING ELECTRONICS TECH CO LTD