Overvoltage protection circuit
An overvoltage protection circuit and overvoltage technology, which is applied in the direction of protection against overvoltage, can solve the problems of damaged circuit components, irreparable, slow power-off speed, etc.
Inactive Publication Date: 2015-06-03
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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Problems solved by technology
[0002] At present, the stability requirements for micro-servers are getting higher and higher, and there are more and more mobile workstations. Most of the mobile workstations use batteries as mobile power sources, which requires point-to-point conversion. The high voltage after the power conversion module fails will be damaged. Circuit components, even causing irreparable consequences
Most of the overvoltage protection circuits commonly used in the market currently use relays as switches to slow down the power supply.
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[0020] Please refer to figure 1 , In a preferred embodiment of the present invention, an overvoltage protection circuit includes an overvoltage sensing circuit 10 , a switching element 20 and a delay circuit 30 .
[0021] Please refer to figure 2 , the delay circuit 30 includes a voltage converter U1 and a comparator U2. A power supply V0 is connected to a node 31 through a diode D5, the node 31 is connected to the negative input terminal of the comparator U2 through a resistor R11, and the negative input terminal is grounded through a resistor R12. The negative input terminal is also grounded through a capacitor C3. The node 31 is connected to the input terminal of the voltage converter U1, and the output terminal of the voltage converter U1 is connected to the positive input terminal of the comparator U2 through a resistor R14. The positive input end is grounded through a resistor R15. The input terminal and the output terminal of the voltage converter U1 are grounded t...
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An overvoltage protection circuit comprises a switch element and further comprises an overvoltage sensor circuit. The overvoltage sensor circuit comprises a voltage stabilizing diode and a switching circuit connected with the voltage stabilizing diode. The switch element comprises a control terminal, a first connecting end and a second connecting end, wherein the control terminal is connected with the switching circuit, the first connecting end is connected with a power supply, and the second connecting end is connected with a voltage output end. The voltage stabilizing diode is connected between the switching circuit and the power supply. The voltage stabilizing diode can be broken through when the power supply is in an overvoltage state. Thus, the switching circuit can close the switch element, and the power supply is prevented from supplying power for the voltage output end.
Description
technical field [0001] The invention relates to an overvoltage protection circuit. Background technique [0002] At present, the stability requirements for micro-servers are getting higher and higher, and there are more and more mobile workstations. Most of the mobile workstations use batteries as mobile power sources, which requires point-to-point conversion. The high voltage after the power conversion module fails will be damaged. The components of the circuit may even cause irreparable consequences. Most of the overvoltage protection circuits commonly used in the market currently use relays as switches to slow down the power supply. Contents of the invention [0003] In view of the above, it is necessary to provide an overvoltage protection circuit that quickly shuts down the power supply. [0004] An overvoltage protection circuit, including a switch element, the overvoltage protection circuit also includes an overvoltage sensing circuit, the overvoltage sensing circ...
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Inventor 王治大李孟冬
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD