Resonance drive modular control method with dynamic power supply

Abstract

The invention provides a resonance drive module control method with a dynamic power, adopting the technical scheme: the traditional hard switch drive is improved to the resonance soft switch drive, the dynamic power +Von capacitance pump lower than Ugs is used to supply power to drive the voltage Ugs, in the non-driving period, the grid voltage Ugs is -Voff negative bias, which effectively overcomes Ci 'the Miller effect', reduces the feedtrhough harm of the half bridge or the full bridge; the capacitance pump of the power Von in the driving period and the capacitance pump of the -Voff in the non-driving period are all supplied with power by a secondary winding of an isolating transformer, namely the transformer transmits the driving frequency f, also transmits the two dynamic capacitance pump power +Von and -Voff. The invention has the advantages of strong interference killing feature, higher reliability of the negative bias drive of the combination module, little loss, high efficiency and excellent performance price ratio.

Description

technical field [0001] The invention relates to a control method of a switching power supply, in particular to a control method of a low-loss resonant drive module specially used for non-common-ground power electronic switch drive. Background technique [0002] The most important part of the switching power supply is the power electronic switch, which is the key part of the weak current control of the strong current. It can be expressed by the D pole and the S pole representing the strong current switch and the G pole representing the weak current drive. See figure 1 shown. When the gate is applied with a high-level drive voltage Ugs (generally not exceeding 20 volts), see figure 1 t in (C) 1 to t 2 , T 3 to t 4 , t 5 to t 6 Period, so that the power electronic switch is controlled by strong current, so ids indicates that the power electronic switch is turned on (ON), and in the period when there is no driving voltage Ugs (no control signal), see figure 1 Period t in...

AI Technical Summary

Problems solved by technology

How to reduce the driving power consumption ΔPg? Selecting a power electronic switching tube with a small Ci may lead to a higher saturated on-resistance Rds(ON) of the switching tube and increase the conduction loss; reducing the frequency may lead to an increase in the inductance core; the most effective and active method should pay attention to Reduce the driving voltage Ugs

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