Surge suppression circuit and switching control circuit

Abstract

The invention provides a surge suppression circuit and a switching control circuit which are used for filtering voltage concussion caused by an inductor. The surge suppression circuit comprises an energy release path and a sensing circuit, wherein one end of the energy release path is coupled with the connecting end of a circuit, and the other end of the energy release path is coupled with a reference potential; and the sensing circuit is coupled with the connecting end, a sensing circuit of a switching unit is provided with a high-pass element, and the high-pass element is used for conducting the energy release path of the switching unit when the voltage of the connecting end of the switching unit has radio-frequency signals.

Description

Technical field [0001] The invention relates to a surge suppression circuit and a conversion control circuit, in particular to a surge suppression circuit and a conversion control circuit for suppressing high-frequency oscillation signals of potential caused by inductance elements. Background technique [0002] See figure 1 , figure 1 It is a circuit diagram of a traditional DC-to-DC step-down conversion circuit. The DC-DC step-down conversion circuit includes a controller 10, transistors M1 and M2, an inductor L, and an output capacitor Cout. The transistors M1 and M2 are connected in series to an input power source Vin and a ground potential. One end of the inductor L is coupled to the junction of the transistors M1 and M2, and the other end is coupled to the output capacitor Cout to output an output voltage Vout. The controller 10 generates a control signal UG and LG according to the output voltage Vout and the voltage signal Vp of the transistors M1 and M2 to control the tra...

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Problems solved by technology

[0004] Such a phenomenon will cause the withstand voltage level of transistors M1 and M2 to be even as figure 1 When the controller 10 in the shown embodiment is connected to the connection point of the transistors M1 and M2, the withstand voltage level of the controller 10 also needs to be increased at the same time

This will not only increase the overall circuit cost, but also the voltage range of the voltage signal Vp will vary with different circuit designs, and may still exceed the withstand voltage of the controller and transistor, resulting in shortened service life or even damage

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