Power supply overvoltage protection circuit
An overvoltage protection circuit and power supply technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as poor protection effect, low protection voltage, large PCB space, etc., and achieve good output overvoltage protection effect and cost. Low, simple structure effect
Inactive Publication Date: 2017-10-03
上海乐野网络科技有限公司
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Problems solved by technology
[0002] At present, the power supply output overvoltage protection circuit in the prior art usually detects the output voltage. When the output voltage is too high, the Zener diode is turned on, the optocoupler is turned on, and the triode is turned on, so that the IC chip can cause the protection voltage to be pulled. Low, so as to achieve output overvoltage protection, but this kind of technology has high cost, needs to occupy a large PCB space, and the protection effect is not good. Based on this, it is still necessary to design a power supply overvoltage protection circuit
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[0010] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0011] refer to figure 1 , This specific embodiment adopts the following technical solutions: a power supply overvoltage protection circuit, including the first diode D1-the fourth diode D4, the light-emitting diode D5, the triode Q1A, the MOS transistor Q2, the first resistor R1-the fourth Four resistors R4, the first capacitor C1-the third capacitor C3, the emitter of the triode Q1A and the source of the MOS transistor Q2 are connected to the input voltage Vin terminal, and the first resistor R1 and the base of the triode Q1A are connected between the emitter and the base. A series circuit of the third resistor R3, the collector of the transistor Q1A is connected to the gate of the second diode D2 to the MOS transistor Q2, and the node between t...
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The invention discloses a power supply overvoltage protection circuit and relates to the technical field of voltage protection. An emitter of a triode and a source of an MOS transistor are connected with an input voltage Vin end; a serial connection circuit formed by a first resistor and a third resistor is connected between the emitter and the base of the triode; the collector of the triode is connected with gates of a second diode and the MOS transistor; a node between the first resistor and the third resistor is inversely connected with a first diode to an earth end; the gate and drain of the MOS transistor are connected with the second resistor and a third diode to the earth end; the drain of the MOS transistor is also connected with a fourth triode, a fourth resistor and a light emitting diode to the earth end; the negative end of the fourth diode is also connected with a parallel circuit formed by a first capacitor, a second capacitor and a third capacitor to the earth end; and the negative end of the fourth diode is connected with a voltage output Vout end. The circuit is low in cost and small in occupied space, the relatively good output overvoltage protection effect can be obtained, and the safety and reliability of a power supply are improved.
Description
technical field [0001] The invention relates to the technical field of voltage protection, in particular to a power supply overvoltage protection circuit. Background technique [0002] At present, the power supply output overvoltage protection circuit in the prior art usually detects the output voltage. When the output voltage is too high, the Zener diode is turned on, the optocoupler is turned on, and the triode is turned on, so that the IC chip can cause the protection voltage to be pulled. Low, so as to realize the output overvoltage protection, but this kind of technology has high cost, needs to occupy a large PCB space, and the protection effect is not good. Based on this, it is still necessary to design a power supply overvoltage protection circuit. Contents of the invention [0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a power supply overvoltage protection circuit with low cost and small footprint, which ca...
Claims
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IPC IPC(8): H02H7/12
CPCH02H7/1203
Inventor 杜茂峰章岳鹏伍洁慧
Owner 上海乐野网络科技有限公司