Multi-level switch power supply circuit and voltage conversion equipment

Abstract

The invention provides a multi-level switch power supply circuit and voltage conversion equipment. The circuit comprises a first-level voltage converter, a second-level voltage converter, a switch assembly and a control circuit, wherein an input end of the first-level voltage converter is connected with an input end of a multi-level switch power supply, a first output end of the first-level voltage converter is connected with one end of the switch assembly, a second output end of the first-level voltage converter is connected with a second input end of the second-level voltage converter, the other end of the switch assembly is connected with a first input end of the second-level voltage converter, a first input end of the control circuit is connected with the input end of the multi-level switch power supply, and an output end of the control circuit is connected with a control end of the switch assembly. The multi-level switch power supply circuit is advantaged in that when a voltage of the input end of the multi-level switch power supply is zero, a high voltage capacitor is made to disconnect with a back-level circuit, so the multi-level switch power supply is made to realize rapid power failure, people or conductive objects contacting the multi-level switch power supply can be prevented from being hurt by electric shock, safety of the multi-level switch power supply is improved, and user experience is improved.

Description

technical field [0001] The present application relates to the field of electronic technology, in particular to a multi-stage switching power supply circuit and voltage conversion equipment. Background technique [0002] In the current multi-stage switching power supply, the output ends of the power supplies of each stage include filter capacitors for filtering. And in order to achieve a better filtering effect, generally the higher the output voltage of the power supply, the larger the filter capacitor of the subsequent stage. [0003] Usually a large amount of charge can be stored in a large capacitor, which leads to the fact that when the voltage at the input terminal of the multi-level switching power supply is zero, the voltage at the output terminal cannot be zero in time. At this time, if people or conductive objects touch the multi-level switching power supply, it may It will cause the danger of electric shock or damage the high-voltage capacitor, affecting the use o...

AI Technical Summary

Problems solved by technology

[0003] Usually a large amount of charge can be stored in a large capacitor, which leads to the fact that when the voltage at the input terminal of the multi-level switching power supply is zero, the voltage at the output terminal cannot be zero in time. At this time, if people or conductive objects touch the multi-level switching power supply, it may It will cause the danger of electric shock or damage the high-voltage capacitor, which will affect the use of users, endanger the safety of users, and poor user experience

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