A switching power supply circuit and TV set without high voltage and large electrolytic capacitor

Abstract

The invention discloses a switching power supply circuit and a television set without high-voltage large electrolytic capacitors. The switching power supply is connected to the electrical equipment and includes a first filter module, a rectifier module, a second filter module, a third filter module and Switching power supply module; the alternating current output by the alternating current power supply is filtered by the first filtering module and then rectified by the rectifying module to become direct current, and the switching power supply module converts the direct current filtered by the second filtering module into a pre- The voltage is set and output to the electrical equipment respectively; the first filtering module is used to suppress the common mode interference signal generated when the switching power supply module is working, and the second filtering module is used to suppress the common mode interference signal generated when the switching power supply module is working. The electromagnetic radiation interference signal and the differential mode interference signal, the third filter module is used to suppress the interference signal between the input end and the output end of the switching power supply module, effectively reducing electromagnetic radiation and improving the safety of power supply operation.

Description

A switching power supply circuit and TV set without high voltage and large electrolytic capacitor technical field The present invention relates to the technical field of power supply, in particular to a kind of switching power supply circuit without high voltage large electrolytic capacitor and power supply circuit. TV. Background technique With the development of society, people have higher and higher requirements on the volume, weight and cost of various machinery and equipment, corresponding to The requirements for the switching power supply are also higher, which makes the design of the EMI filter circuit in the switching power supply more difficult, and the traditional The EMI filter circuit is only suitable for switching power supplies with high-voltage large electrolytic capacitors, and switching power supplies without high-voltage large electrolytic capacitors The noise is large, and the conducted and radiated interference signals generated by the switching p...

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Problems solved by technology

[0002] With the development of society, people have higher and higher requirements for the volume, weight and cost of various machinery and equipment, and the corresponding requirements for switching power supplies are also higher, which makes the design of EMI filter circuits in switching power supplies more difficult. The traditional EMI filter circuit is only suitable for switching power supplies with high-voltage and large electrolytic capacitors. Switching power supplies without high-voltage and large electrolytic capacitors have relatively high noise, and the conduction and radiation interference signals generated by switching power supplies during operation are difficult to suppress. , which in turn reduces the safety of the switching power supply

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