Resonance switch driving controlling and protecting circuit

Abstract

The invention discloses a resonant switch driving control and protection circuit, which is applied to a bridge type series resonant circuit. It mainly includes repetitive pulse maximum frequency limiting circuit, dead zone time control circuit, maximum pulse width time control circuit, minimum pulse width time control circuit time control circuit, logic combination circuit, double frequency division drive circuit, etc. When the switching frequency is less than 1 / 2 resonant frequency, the resonant current works intermittently, and the circuit relies on the zero-crossing signal of the series resonant current to realize the zero-current / zero-voltage turn-off of the switching tube. It can meet the purpose of adjusting the output voltage by PFM mode and intermittent power supply. It is suitable for the driving pulse control of the bridge series resonant circuit. The work of the bridge switch always maintains the correct alternate driving sequence. It has multiple protections and stable and reliable performance. , strong anti-interference ability, widely used.

Description

technical field [0001] The invention belongs to the field of switch power supply control and relates to a resonant switch control protection circuit. Background technique [0002] In the general switching power inverter control system (including resonant switches), you can choose a suitable integrated control chip as the circuit for forming the driving pulse of the switching device. This kind of integrated chip uses a voltage-controlled oscillator (VCO) inside, and the change of the repeated working frequency is controlled by an external voltage, which cannot achieve rapid change and fast shutdown. The oscillation frequency of the voltage-controlled oscillator has a certain limited application range. Moreover, when it is necessary to adjust the duty of the pulse to realize intermittent power supply applications, it cannot meet the requirements. Contents of the invention [0003] The object of the present invention is to provide a resonant switch driving control and protec...

AI Technical Summary

Problems solved by technology

This type of integrated chip uses a voltage-controlled oscillator (VCO) inside, and the change of the repeated working frequency is controlled by an external voltage, which cannot achieve rapid change and fast shutdown. The oscillation frequency of the voltage-controlled oscillator has a certain limited application range.

Moreover, when it is necessary to adjust the duty of the pulse to realize intermittent power supply applications, it cannot meet the requirements

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