| CPC H02M 1/4241 (2013.01) [H02M 1/0058 (2021.05); H02M 1/007 (2021.05); H02M 1/0025 (2021.05); H02M 3/01 (2021.05)] | 17 Claims |
|
1. A power supply which stabilizes and
compensates resonant voltages, comprising:
an input end coupled to an input voltage;
an output end for outputting an output voltage;
a transformer configured to transfer energy of the input voltage from a primary side to a secondary side for supplying the output voltage, and comprising:
a first secondary winding disposed on the secondary side and including a first dotted terminal and a first undotted terminal;
a second secondary winding disposed on the secondary side and including a second dotted terminal and a second undotted terminal;
a primary winding disposed on the primary side and including a third dotted terminal and a third undotted terminal;
a first storage capacitor for storing the energy of the input voltage, and including:
a first end coupled to the input voltage; and
a second end coupled to a first ground level;
a first switch, including:
a first end coupled to the input voltage;
a second end coupled to the second end of the first storage capacitor; and
a control end for receiving a first control signal which switches between a first enable level and a first disable level;
a resonant circuit coupled to the primary winding in the transformer and configured to provide a soft-switching based on a second control signal and a third control signal, wherein the second control signal switches between a second enable level and a second disable level, and the third control signal switches between a third enable level and a third disable level;
a voltage stabilization and feedback compensation circuit configured to:
provide a reference voltage associated with the input voltage;
provide a feedback voltage associated with the reference voltage; and
receive a fourth control signal and lower the feedback voltage when the fourth signal is at a fourth enable level;
a first control circuit disposed on the primary side and configured to:
provide the first control signal and adjust a duty cycle of the first control signal according to the feedback voltage;
receive a detecting voltage and provide the fourth control signal having the fourth enable level when the detecting voltage is at a first level; and
a second control circuit disposed on the primary side and configured to:
provide the second control signal and the third control signal;
detect at least one resonant voltage of the resonant circuit;
adjust a duty cycle of the first control signal according to the feedback voltage;
provide the detecting voltage having the first level when it is determined based on the second control signal, the third control signal and the at least one resonant voltage that the resonant circuit is unable to provide the soft-switching; and
provide the detecting voltage having a second level when it is determined based on the second control signal, the third control signal and the at least one resonant voltage that the resonant circuit is able to provide the soft-switching;
wherein the voltage stabilization and feedback compensation circuit comprises:
a voltage regulator configured to provide a compensation current associated with the reference voltage and including:
a cathode end;
an anode end;
a reference end coupled to the reference voltage; and
a compensation capacitor coupled between the cathode end and the reference end of the voltage regulator for adjusting a gain of the voltage regulator;
a linear optical coupler comprising:
a light-emitting diode configured to convert electrical energy associated with the input voltage into optical energy, and including:
an anode coupled to the first end of the first storage capacitor;
a cathode coupled to the cathode end of the voltage regulator; and
an optical transistor configured to receive the optical energy and convert the optical energy into a feedback current, and including:
a first end coupled to the first control circuit for outputting the feedback voltage; and
a second end;
a feedback capacitor coupled to the optical transistor and configured to provide the feedback voltage by storing energy associated with the feedback current; and
an auxiliary switch including:
a first end coupled to the feedback capacitor;
a second end coupled to the first ground level; and
a control end coupled to the first control circuit for receiving the fourth control signal.
|