Power conversion circuit with energy recovery function and power supply with power conversion circuit

Abstract

The invention discloses a power conversion circuit with an energy recovery function and a power supply with the power conversion circuit, the power conversion circuit is matched with an external starting circuit and a driving circuit for use, the power conversion circuit comprises a power switch device, an MOS tube and a first diode, the gate pole of the MOS tube is connected with the VG end of the driving circuit, and the gate pole of the MOS tube is connected with the VG end of the driving circuit; the source electrode of the MOS tube is connected with the gate electrode of the power switch device, the source electrode of the power switch device is connected with the drain electrode of the MOS tube, the positive electrode of the first diode is connected between the source electrode of the power switch device and the drain electrode of the MOS tube, and the negative electrode of the first diode is connected with the VCC end of the driving circuit; in response to a driving signal output by the VG end, the MOS tube is turned off, and the power switch device is turned off; and when the VDS is greater than the voltage of the VCC end, the first diode is conducted, so that the VDS supplies power to the driving circuit through the first diode. According to the invention, the power consumption in power supply operation is reduced, and high-efficiency operation is realized while high power density is realized.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a power conversion circuit with an energy recovery function and a power supply with the same. Background technique [0002] With the miniaturization of electronic products, portable electronic devices such as smart phones and laptops are more and more widely used in people's lives, and each portable electronic device needs to be equipped with a battery charger. Due to the different battery capacities of various portable electronic devices and the incompatibility of charging interfaces, almost everyone or every family needs to have multiple different chargers, and because the efficiency and power density of the older generation chargers are relatively low , The volume and weight of the charger are relatively large, and the charging speed is relatively slow. This phenomenon needs to be improved with the advancement of technology. [0003] At the same time, with the increasingly fierc...

AI Technical Summary

Problems solved by technology

As we all know, when the output voltage of the power supply needs to change in a large range, the voltage of the auxiliary power supply will also change significantly. In this case, in order to keep the operating voltage of the control drive circuit within an appropriate range, then the auxiliary power supply The power supply also includes a voltage stabilizing circuit, so that the energy consumption and cost of the circuit will also increase accordingly.

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