An overvoltage clamping circuit topological system
A technology of clamping circuit and topology, which is applied in the field of overvoltage clamping circuit topology system, can solve the problems of increasing circuit reliability, low precision of output clamping voltage, complicated circuit, etc., and achieve high working stability and reliability, clamping The effect of simple bit sum control and simplified circuit structure
Inactive Publication Date: 2014-02-26
TIANSHUI HUATIAN MICROELECTRONICS
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Problems solved by technology
The existing topological structure of the overvoltage clamping circuit, the driving circuit has two circuit types: one is to set the oscillator to drive the clamping switch with magnetic isolation and floating ground. This driving method uses magnetic components, which increases the volume of the product and is inconvenient. Miniaturization and integration; the second is to set the oscillator to use multiple voltage boosts to drive the clamping switch. This method is for high-voltage output circuits. There are many components used in the circuit, and the circuit becomes very complicated, which is not conducive to the circuit. Miniaturization and integration, while increasing the number of components in the circuit, the reliability of the circuit is also affected
Low accuracy of output clamp voltage due to pre-regulation drive
Method used
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[0019] The overvoltage clamping circuit topology system of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0020] like figure 1 The topological system of the overvoltage clamping circuit shown includes power input Vin, rectification and superposition drive unit 1, reference and drive signal unit 2, output detection feedback unit 3, clamp switch 4, and clamp switch 4 is a field effect transistor T1; the output end of the power input Vin is respectively connected to the input end of the clamp switch 4 and the input end of the reference and drive signal unit 2, and the output end of the clamp switch 4 is connected to the input end of the rectification superposition drive unit 1, the reference and drive signal unit The output end of 2 is respectively connected to the input end of the detection feedback unit 3 and the rectification and superimposition drive unit 1, and the output end of the detection feedback unit 3 i...
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The invention provides an overvoltage clamping circuit topological system comprising a power supply voltage, a rectification superposing driving unit, a reference and driving signal unit, an output detection feedback unit and a clamping switch. Driving oscillation source signals are subjected to rectification and are superposed on a clamping switch tube output terminal voltage, under a condition that a clamping switch tube does not carry out multi-time-voltage rectification to raise a driving voltage, switch-on of the clamping switch can be driven reliably, and feedback of a precise clamping output voltage is given by comparison of a detected voltage and a reference voltage. The circuit design simplifies a circuit structure and raises the precision degree of the output clamping voltage, and at the same time, the clamping and control of a high voltage output is simpler.
Description
technical field [0001] The invention belongs to the field of electronic devices, and in particular relates to an overvoltage clamping circuit topology system. Background technique [0002] Overvoltage clamping circuits are widely used in harsh power supply environments to protect electrical appliances from being damaged by overvoltage surge breakdown. The existing topological structure of the overvoltage clamping circuit, the driving circuit has two circuit types: one is to set the oscillator to drive the clamping switch with magnetic isolation and floating ground. This driving method uses magnetic components, which increases the volume of the product and is inconvenient. Miniaturization and integration; the second is to set the oscillator to use multiple voltage boosts to drive the clamping switch. This method is for high-voltage output circuits. There are many components used in the circuit, and the circuit becomes very complicated, which is not conducive to the ci...
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Inventor ζδΈε
Owner TIANSHUI HUATIAN MICROELECTRONICS