Overvoltage protection circuit for mine intrinsic safety power source
A technology of overvoltage protection circuit and intrinsically safe power supply, which is applied in the direction of protection against overvoltage, can solve problems such as no overvoltage, and achieve the effect of improving reliability and protecting safety
Inactive Publication Date: 2013-06-19
XIAN GUANGRONG ELECTRICAL
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[0003] The purpose of the present invention is to provide an overvoltage protection circuit for mine-used intrinsically safe power supplies, which solves the shortcomings of no overvoltage protection circuit in the prior art, and can output voltage in time when the voltage of the product is too high. shut-off, to ensure the safety of products and electrical appliances
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[0008] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0009] see figure 1 , the present invention comprises switch circuit, feedback circuit, and sampling circuit comprises resistance R6, resistance R5 and transistor Q2, and switch circuit comprises resistance R4 and transistor Q1, freewheeling resistance R7 and bias resistance R8 connected in parallel at both ends of transistor Q1, and the front end of resistance R6 Connect with the transistor Q1, the back end of the resistor R6 is connected to the external circuit one way, and the other is connected to the resistor R5, the transistor Q2, and the resistor R4 in turn, and the resistor R4 is connected to the transistor Q1 to form a loop; the transistor Q2 passes through the transistor Q3, the regulator Z1 and the transistor Q1 is connected, and the other path is connected with the triode Q1 through the resistor R9 and the voltage regulator tube Z...
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The invention relates to an overvoltage protection circuit for a mine intrinsic safety power source. A 5V / 12V / 18V three-terminal regulator is used by most traditional mine intrinsic safety power source products for conducting voltage transformation, and a special overvoltage protection circuit in a circuit is not available; contingency problems of electric appliances and products can be caused in the situation that a power source can not be turned off in time when the three terminal regulator is short-circuited, and thus final failures of the products or electric appliances are caused. The overvoltage protection circuit for the mine intrinsic safety power source is characterized in that the front end of a resistor R6 is connected with a triode Q1, one path of the back end of the resistor R6 is connected with an external circuit, and the other path of the back end of the resistor R6 is sequentially connected with a resistor R5, a triode Q2 and a resistor R4, and the resistor R4 is connected with the triode Q1 to form a loop. One path of a triode Q2 is connected with the triode Q1 through a triode Q3 and a voltage regulator tube, the other path of the triode Q2 is connected with the triode Q1 through a resistor R9 and the voltage regulator tube Z1. According to the overvoltage protection circuit for the mine intrinsic safety power source, in-time turn-off of the product output by the product when the output voltage of the product is overvoltage is achieved by using a simple circuit, and thus the safety of electric appliances is effectively protected.
Description
technical field [0001] The invention relates to an overvoltage protection circuit of a mine-used intrinsically safe power supply. Background technique [0002] Most of the traditional mining intrinsically safe power supply products use 5V\12V\18V three-terminal voltage regulators for voltage transformation. There is no dedicated overvoltage protection circuit in the circuit. When the three-terminal voltage regulator is short-circuited, the power supply cannot be turned off in time. In this case, it may cause subsequent problems of electrical appliances or products, resulting in the final failure of products or electrical appliances. Contents of the invention [0003] The purpose of the present invention is to provide an overvoltage protection circuit for mine-used intrinsically safe power supplies, which solves the shortcomings of no overvoltage protection circuit in the prior art, and can output voltage in time when the voltage of the product is too high. The shutdow...
Claims
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IPC IPC(8): H02H3/20
Inventor 张弘
Owner XIAN GUANGRONG ELECTRICAL