Control circuit for a resonant converter having at least two output signals
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorsJian Deng, Xiahe Zhang, Qiukai Huang
Life of this patent
Estimating the term…
Abstract
A control circuit for a resonant converter having at least two output signals, the control circuit including: a charge feedback circuit configured to generate a charge feedback signal representing a resonant current of a resonant circuit in the resonant converter; and a switching control signal generating circuit configured to generate switching control signals according to the charge feedback signal and feedback signals representing error information of each of the at least two output signals.
Claims20
A control circuit for a resonant converter having at least two output signals, the control circuit comprising:
- a) a charge feedback circuit configured to generate a charge feedback signal representing a resonant current of a resonant circuit in the resonant converter;
- b) a switching control signal generating circuit configured to generate switching control signals according to the charge feedback signal and feedback signals representing error information of each of the at least two output signals;
- c) wherein the resonant converter comprises a switch circuit for generating a periodic square wave voltage to drive the resonant circuit;
- d) wherein when a first switch unit in the switch circuit is turned on, energy on a primary side of a transformer is transmitted to a first output terminal through a first secondary winding;
- e) wherein when a second switch unit in the switch circuit is turned on, energy on the primary side of the transformer is transmitted to a second output terminal through a second secondary winding;
- f) wherein the first output terminal generates a first output signal, and the second output terminal generates a second output signal;
- and
- g) wherein the first output terminal is coupled to a dotted terminal of the first secondary winding, and the second output terminal is coupled to a non-dotted terminal of the second secondary winding.
A control circuit for a resonant converter having at least two output signals, the control circuit comprising:
- a) a charge feedback circuit configured to generate a charge feedback signal representing a resonant current of a resonant circuit in the resonant converter;
- b) a switching control signal generating circuit configured to generate switching control signals according to the charge feedback signal and feedback signals representing error information of each of the at least two output signals;
- c) wherein a DC component of the charge feedback signal is controlled to be equal to a bias voltage;
- d) wherein the switching control signal generating circuit deactivates a first control signal to turn off the first switch unit when the charge feedback signal rises to a sum of the bias voltage and the second feedback signal;
- and
- e) wherein the periodic square wave voltage generated by the switch circuit is switched from a high voltage corresponding to an input voltage to a low voltage corresponding to a reference ground.
A control circuit for a resonant converter having at least two output signals, the control circuit comprising:
- a) a charge feedback circuit configured to generate a charge feedback signal representing a resonant current of a resonant circuit in the resonant converter;
- b) a switching control signal generating circuit configured to generate switching control signals according to the charge feedback signal and feedback signals representing error information of each of the at least two output signals;
- c) wherein a DC component of the charge feedback signal is controlled to be equal to a bias voltage;
- d) wherein the switching control signal generating circuit deactivates a second control signal to turn off the second switch unit when the charge feedback signal drops to a difference between the bias voltage and the first feedback signal;
- and
- e) wherein the periodic square wave voltage generated by the switch circuit is switched from a low voltage corresponding to a reference ground to a high voltage corresponding to an input voltage.
Dependencies are inferred from the claim text.