Driving circuit and switching power supply device

By designing a driving circuit for switching power supply, using the third switching element and the second switching element to achieve rapid discharge and low loss shutdown of the input capacitor, the current limiting problem and application limitations during reverse reset of the drive transformer in the prior art are solved, and the effect of low power consumption and wide application is achieved.

CN114079368BActive Publication Date: 2025-03-25TDK CORP
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Patent Information

Application Number
CN202010841782.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-08-20
Publication Date
2025-03-25
Estimated Expiration
2040-08-20

AI Technical Summary

Technical Problem

The prior art lacks a current limiting resistance when the drive transformer is reverse reset, resulting in a large reset current flowing in the PNP type transistor, or even damage, and the application is limited to a one-way pulsed driving signal.

Method used

A driving circuit is designed to quickly discharge the charge stored in the input capacitance of the first switching element by opening the third switching element, and quickly turn it off with the second switching element, and adjust the charge discharge speed and working point through the resistor element to ensure the stability and low power consumption of the driving circuit.

Benefits of technology

It realizes rapid discharge and low loss shutdown of large input capacitors, reduces power consumption and temperature rise of the driver IC and transformer, and is suitable for AC pulses and unidirectional positive pulses, with a wider range of applications.

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Abstract

The present invention provides a driving circuit for driving a first switching element, comprising: a first diode, a cathode terminal of which is connected to a gate terminal of the first switching element; a second switching element, a first terminal of which is connected to an anode terminal of the first diode, a second terminal of which is connected to the gate terminal of the first switching element, and a third terminal of which is connected to a source terminal of the first switching element; a third switching element, a drain terminal of which is connected to the anode terminal of the first diode, and a source terminal of which is connected to the source terminal of the first switching element; a parallel circuit comprising a Zener diode and a first capacitor; and a driving transformer having a coil, one end of which is connected to the drain terminal of the third switching element via the parallel circuit, the other end of which is connected to the gate terminal of the third switching element and to the source terminal of the third switching element via a second diode, one end of the parallel circuit is connected to one end of the coil, and the cathode terminal of the second diode is connected to the other end of the coil.
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