Control circuit having an impedance modulation controlling power converter for saving power
AssigneeSystem General Corp.
InventorTa-yung Yang
Life of this patent
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Abstract
A standby circuit is provides to on/off a power converter for power saving. The standby circuit includes a comparison circuit. The comparison circuit is coupled to a feedback loop of the power converter to generate a mode signal when a feedback signal of the feedback loop is lower than a threshold signal. A resistive device is coupled to the feedback loop. The resistance of the resistive device is increased in response to the mode signal. The mode signal is further coupled to turn off a switching control circuit of the power converter.
Claims15
A standby circuit of a power converter, comprising:
- a comparison circuit, coupled to a feedback loop of the power converter to compare a feedback signal with a threshold signal for generating a mode signal;
- and
- a resistive device, coupled to the feedback loop;
- wherein resistance of the resistive device is changed in response to the mode signal.
A controller of a power converter comprising:
- a standby circuit including:
- a comparison circuit, coupled to a feedback loop of the power converter to generate a mode signal when a feedback signal of the feedback loop is lower than a threshold signal;
- and
- a resistive device, coupled to the feedback loop;
- wherein resistance of the resistive device is increased in response to the mode signal;
- and
- a switching control circuit, generating a switching signal to regulate an output of the power converter in response to the mode signal.
A control circuit of a power converter, comprising:
- a standby circuit, including:
- a feedback input circuit;
- and
- a comparison circuit, coupled to the feedback input circuit of the power converter to generate a mode signal when a feedback signal of the feedback input circuit is lower than a threshold signal;
- wherein impedance of the feedback input circuit is changed in response to the mode signal;
- and
- a switching control circuit, generating a switching signal to regulate an output of the power converter in response to the mode signal.
Dependencies are inferred from the claim text.