POWER CONVERTER AND METHOD OF CONTROLLING THE SAME
First Claim
Patent Images
1. A power converter comprising:
- a full-bridge switching circuit configured for converting a DC input voltage into a square wave voltage;
a resonant circuit electrically connected to the full-bridge switching circuit to receive the square wave voltage and configured to convert the square wave voltage into a resonant voltage;
a transformer having an input side and an output side;
the input side electrically connected to the resonant circuit to receive the resonant voltage;
an over-voltage protection unit electrically connected to the output side to detect an output voltage outputted from the output side and configured to produce an output voltage signal;
a PWM control unit configured for producing PWM signals;
a trigging control unit receiving the output voltage signal and the PWM signals and configured for producing a trigging control signal; and
a driving unit receiving the trigging control signal and the PWM signals and configured to turn on or turn off the full-bridge switching circuit according to the trigging control signal and the PWM signals;
wherein the trigging control unit outputs a low-level trigging control signal to disable the driving unit at an end of duty cycle of a corresponding PWM signal when an over-voltage output is detected by the over-voltage protection unit.
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Abstract
A power converter includes a full-bridge switching circuit, a resonant circuit, a transformer, an over-voltage protection unit, a PWM control unit, a trigging control unit, and a driving unit. The over-voltage protection unit detects an output voltage of the power converter to produce an output voltage signal. The PWM control unit produces PWM signals. The trigging control unit receives the output voltage signal and the PWM signals to produce a trigging control signal. When an over-voltage output is detected by the over-voltage protection unit, the trigging control unit outputs the low-level trigging control signal to disable the driving unit at the end of duty cycle of the PWM signals.
21 Citations
16 Claims
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1. A power converter comprising:
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a full-bridge switching circuit configured for converting a DC input voltage into a square wave voltage; a resonant circuit electrically connected to the full-bridge switching circuit to receive the square wave voltage and configured to convert the square wave voltage into a resonant voltage; a transformer having an input side and an output side;
the input side electrically connected to the resonant circuit to receive the resonant voltage;an over-voltage protection unit electrically connected to the output side to detect an output voltage outputted from the output side and configured to produce an output voltage signal; a PWM control unit configured for producing PWM signals; a trigging control unit receiving the output voltage signal and the PWM signals and configured for producing a trigging control signal; and a driving unit receiving the trigging control signal and the PWM signals and configured to turn on or turn off the full-bridge switching circuit according to the trigging control signal and the PWM signals; wherein the trigging control unit outputs a low-level trigging control signal to disable the driving unit at an end of duty cycle of a corresponding PWM signal when an over-voltage output is detected by the over-voltage protection unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling a power converter;
- steps of the method comprising;
(a) providing a full-bridge switching circuit, a resonant circuit, and a transformer; (b) providing an over-voltage protection unit to detect an output voltage of the power converter and produce an output voltage signal; (c) providing a PWM control unit to produce PWM signals; (d) providing a trigging control unit to receive the output voltage signal and the PWM signals and produce a trigging control signal; (e) providing a driving unit to receive the trigging control signal and the PWM signals to turn on or turn off the full-bridge switching circuit; and (f) outputting a low-level trigging control signal by the trigging control unit to disable the driving unit at an end of duty cycle of the corresponding PWM signal when an over-voltage output is detected by the over-voltage protection unit. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
- steps of the method comprising;
Specification