Resonant power supply, primary-side feedback excitation power supply controller, method, and control apparatus

A primary-side feedback excitation power supply controller, electrically connected to a bridge circuit, an LC series resonant network, and a primary-side winding of a transformer that are in a resonant power supply, wherein the primary-side feedback excitation power supply controller is configured to:

• receive an input voltage Vt and an input current Ir provided by the LC series resonant network;
• calculate an excitation inductance Lm.est based on the input current Ir;
• and
• output a drive signal to the bridge circuit, wherein the drive signal is based on the input voltage Vt, the input current Ir, and the excitation inductance Lm.est, and wherein the drive signal is to drive the bridge circuit to convert a direct current provided by a power supply into a square wave signal.

A control method, applied to a primary-side feedback excitation power supply controller, the method comprising:

• receiving, by the primary-side feedback excitation power supply controller, an input voltage Vt and an input current Ir that are provided by an LC series resonant network, wherein the primary-side feedback excitation power supply controller is electrically connected to a bridge circuit, the LC series resonant network, and a primary-side winding of a transformer that are in a resonant power supply;
• outputting, by the primary-side feedback excitation power supply controller, a drive signal to the bridge circuit in response to receiving the input voltage Vt and the input current Ir;
• driving the bridge circuit, based on the drive signal, to convert a direct current provided by a power supply into a square wave signal;
• calculating an excitation inductance Lm.est;
• calculating an output voltage Vo.est and an output current Io.est of the resonant power supply based on the input voltage Vt, the input current Ir, a leakage inductance Llk1 of the primary-side winding, and the excitation inductance Lm.est;
• and
• outputting the drive signal to the bridge circuit.

A control apparatus, comprising:

• a load;
• and
• a resonant power supply electrically connected to the load, wherein the resonant power supply further comprises:
• a transformer, comprising a primary-side winding and a secondary-side winding;
• a bridge circuit, electrically connected to a power supply, and configured to convert, based on a drive signal, a first direct current provided by the power supply into a square wave signal;
• an LC series resonant network, electrically connected to the bridge circuit and the primary-side winding, and configured to convert the square wave signal into a first alternating current, and output the first alternating current to the primary-side winding, wherein the first alternating current comprises an input voltage Vt and an input current Ir;
• a rectifier bridge, electrically connected to the secondary-side winding, and configured to convert a second alternating current produced on the secondary-side winding into a second direct current;
• and
• a primary-side feedback excitation power supply controller, electrically connected to the primary-side winding, the bridge circuit, and the LC series resonant network, and configured to:
• receive the input voltage Vt and the input current Ir;
• calculate an excitation inductance Lm.est based on the input current Ir;
• and
• output the drive signal to the bridge circuit, wherein the drive signal is based on the input voltage Vt, the input current Ir, and the excitation inductance Lm.est.

A non-transitory computer readable storage medium, comprising computer instructions stored thereon which, when executed by a primary-side feedback excitation power supply controller, cause the primary-side feedback excitation power supply controller to:

• receive an input voltage Vt and an input current Ir that are provided by an LC series resonant network electrically connected to the primary-side feedback excitation power supply controller;
• calculate an excitation inductance Lm.est;
• calculate an output voltage Vo.est, and an output current Io.est of a resonant power supply based on the input voltage Vt, the input current Ir, a leakage inductance Llk1 of a primary-side winding of a transformer in the resonant power supply, and the excitation inductance Lm.est, wherein the primary-side feedback excitation power supply controller is electrically connected to the primary-side winding;
• and
• output a drive signal to a bridge circuit that is electrically connected to the primary-side feedback excitation power supply controller, wherein the drive signal is for driving the bridge circuit to convert a direct current provided by a power supply into a square wave signal.

A computer program product, comprising computer instructions stored on a non-transitory computer readable storage medium, wherein when the computer instructions are run on a primary-side feedback excitation power supply controller, the primary-side feedback excitation power supply controller configured to:

• receive an input voltage Vt and an input current Ir that are provided by an LC series resonant network electrically connected to the primary-side feedback excitation power supply controller;
• calculate an excitation inductance Lm.est;
• calculate an output voltage Vo.est, and an output current Io.est of a resonant power supply based on the input voltage Vt, the input current Ir, a leakage inductance Llk1 of a primary-side winding of a transformer in the resonant power supply, and the excitation inductance Lm.est, wherein the primary-side feedback excitation power supply controller is electrically connected to the primary-side winding;
• and
• output a drive signal to a bridge circuit that is electrically connected to the primary-side feedback excitation power supply controller, wherein the drive signal is for driving the bridge circuit to convert a direct current provided by a power supply into a square wave signal.