Overvoltage protection circuit
An overvoltage protection circuit and resistor technology, applied in the direction of protection against overvoltage, etc., can solve the problems of burning out the circuit, complex circuit structure, high risk of dead pixels, etc., to reduce cost and power consumption, circuit The effect of simple structure, fewer devices and nodes
Inactive Publication Date: 2014-03-26
ZHENGZHOU DANDIAN TECH SOFTWARE
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Problems solved by technology
In the circuit, due to factors such as circuit signal interference, short circuit or unstable power supply voltage, it may cause a sudden increase in voltage. Excessive voltage will affect the performance of the circuit, and there is a risk of burning the circuit
[0003] The overvoltage protection circuit is a necessary circuit to solve the problem of overvoltage. The structure of the circuit in the prior art is relatively complicated, and there are many devices and nodes required. More devices cause higher cost and power consumption, and more nodes cause the risk of dead pixels. Big
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[0008] Below in conjunction with accompanying drawing, the present invention is described in detail.
[0009] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0010] like figure 1 Shown is the circuit principle diagram of the overvoltage protection circuit of the present invention.
[0011] An overvoltage protection circuit of the present invention includes a voltage input terminal VIN and a voltage output terminal VOUT, a first resistor R1 is connected in series between the voltage input terminal VIN and the voltage output terminal VOUT, and further includes a A voltage regulating circuit is connected in parallel, and the voltage regulating circuit i...
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The invention discloses an overvoltage protection circuit which comprises a voltage input end (VIN) and a voltage output end (VOUT), wherein a first resistor (R1) is serially connected between the voltage input end (VIN) and the voltage output end (VOUT). The overvoltage protection circuit is characterized by also comprising a voltage adjustment circuit connected with the first resistor (R1) in parallel; the voltage adjustment circuit comprises a first NPN bipolar triode (N1), a second NPN bipolar transistor (N2), a first PNP bipolar transistor (P1), a second PNP bipolar transistor (P2), a second resistor (R2), a third resistor (R3), a first avalanche diode or a first zener diode (D1) and a second avalanche diode or a second zener diode (D2). The overvoltage protection circuit has the benefits that the circuit structure is simple, fewer devices and nodes are required, the cost and the power consumption are reduced, and the dead pixel risk is lowered.
Description
technical field [0001] The invention relates to an overvoltage protection circuit. Background technique [0002] The voltage required by portable electronic products is generally relatively low, generally 1.5V, 2.5V, 3.3V or 5V voltage. In the circuit, due to factors such as circuit signal interference, short circuit or unstable power supply voltage, the voltage may suddenly rise. Excessive voltage will affect the performance of the circuit, and there is a risk of burning the circuit. [0003] The overvoltage protection circuit is a necessary circuit to solve the problem of overvoltage. The structure of the circuit in the prior art is relatively complicated, and there are many devices and nodes required. More devices cause higher cost and power consumption, and more nodes cause the risk of dead pixels. big. Contents of the invention [0004] The object of the present invention is to provide an overvoltage protection circuit with a simple structure and few nodes in view o...
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IPC IPC(8): H02H3/20
Inventor 周晓东桑园余力
Owner ZHENGZHOU DANDIAN TECH SOFTWARE