Power supply circuit with surge suppression function

Abstract

The invention provides a power supply circuit, which comprises a transformer, a detection unit and a surge suppression module, wherein the transformer is provided with a primary coil and a secondary coil; the primary coil is used for receiving input voltage; the secondary coil is used for sensing the input voltage and correspondingly outputting output voltage; the detection unit is arranged in the primary coil for sensing whether surge voltage is generated in the primary oil so as to emit a detection signal; the surge suppression module is connected with the detection unit for receiving a detection signal so as to judge whether to perform surge suppression on the input voltage in the primary coil according to the detection signal; when the surge voltage is generated in the primary coil, the input voltage is transmitted into the surge suppression module to perform surge suppression treatment; and when the surge voltage is not produced in the primary coil, the input voltage is not transmitted into the surge suppression module. By using the power supply circuit, the surge voltage in the circuit can be effectively suppressed, the electromagnetic interface can be reduced, a surge suppression function is selectively used, and the working efficiency of the power supply circuit can be further improved.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to a power supply circuit with surge suppression function. Background technique [0002] With the continuous change of electronic products, designers are increasingly striving for perfection in the design of each link of the product. Among them, the power supply circuit of electronic products is an indispensable component module, such as figure 1 As shown, it is a functional system architecture diagram of a power supply circuit in the prior art. Generally speaking, the transformer 2 receives the input voltage output from the input port 1, and after stepping down, rectifies and filters it through the rectifying and filtering element 5, and then outputs it from the output port 6. voltage to power electronic products, wherein the input voltage of the input port 1 can be regulated by the pulse controller 3 , and the control switch 3 is used to control the conduction between the pulse controller...

AI Technical Summary

Problems solved by technology

However, on the one hand, because the power supply circuit works at high frequency, on the other hand, since the transformer coil cannot fully couple the iron core, and there is often a gap in the center of the iron core, leakage inductance will occur where the coupling is poor. Therefore, when the power supply circuit operates at the moment of switching power, it is relatively easy to generate a considerable surge voltage. The surge voltage will not only cause damage to electronic components, but also cause serious electromagnetic interference.

This will force the designer to be forced to provide in the selection of part specifications, and at the same time reduce the efficiency of the entire power supply circuit

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