Controller With Loop Impedance Modulation For Power Converter
AssigneeSystem General Corp.
InventorTa-yung Yang
Life of this patent
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Abstract
A control circuit is provided to generate a mode signal at light load of the power converter. The mode signal is coupled to disable the switching signal for saving power. The impedance of an input circuit is increased in response to the mode signal. Furthermore, a soft start circuit is initiated by the mode signal when switching signal is enabled. An external capacitor associates with the impedance of the input circuit determine the off period of the switching signal.
Claims14
A control circuit of a power converter, comprising:
- a switching circuit, coupled to a feedback loop of the power converter to generate a switching signal in response to a feedback signal for output regulation;
- a soft start circuit, coupled to switching circuit and generating a soft start signal to control the switching signal;
- a resistive device, coupled to the feedback loop;
- and
- a comparison circuit, coupled to the feedback loop to compare the feedback signal with a threshold signal for generating a mode signal;
- wherein the mode signal is used to disable the switching signal for saving power, modulate an impedance of the resistive device and reset the soft start circuit for enabling soft start of the switching signal when the switching signal is enabled.
A controller of a power converter, comprising:
- a switching circuit, coupled to a feedback loop of the power converter to generate a switching signal in response to a feedback signal;
- a comparison circuit, coupled to the feedback loop 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 the mode signal is coupled to disable the switching signal for saving power and a resistance of the resistive device is increased in response to the mode signal.
A control circuit of a power converter, comprising:
- a switching circuit, coupled to an input circuit of the power converter to generate a switching signal in response to a feedback signal;
- and
- a comparison circuit, coupled to the input circuit of the power converter to generate a mode signal when the feedback signal of the input circuit is lower than a threshold signal;
- wherein the mode signal is coupled to turn off the switching signal for saving power and an impedance of the input circuit is increased in response to the mode signal.
A controller of a power converter, comprising:
- a switching circuit, coupled to an-input circuit of the power converter to generate a switching signal in response to a feedback signal;
- a soft start circuit, coupled to switching circuit and generating a soft start signal to control the switching signal;
- and
- a comparison circuit, coupled to the input circuit of the power converter to generate a mode signal when the feedback signal of the feedback input circuit is lower than a threshold signal;
- wherein the mode signal is coupled to disable the switching signal for saving power and the mode signal is further coupled to reset the soft start circuit for enabling soft start of the switching signal when switching signal is enabled.
Dependencies are inferred from the claim text.