Input voltage sensor responsive to load conditions
AssigneePower Integrations, Inc.
InventorsZhao-Jun Wang, Giao Minh Pham, Roland Sylvere Saint-Pierre
Life of this patent
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Abstract
An ac-dc power converter controller includes a switch driver circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from an input of the power converter to an output of the power converter. An input sense circuit is coupled to receive an input sense signal representative of the input of a power converter. A sense enable circuit is coupled to generate a sense enable signal in response to the drive signal. The sense enable signal is coupled to control the input sense circuit to sense the input sense signal for an extended duration of time after the power switch turns OFF.
Claims24
An ac-dc power converter controller, comprising:
- a switch driver circuit coupled to generate a drive signal to control switching of a power switch to control a transfer of energy from an input of the power converter to an output of the power converter;
- an input sense circuit coupled to receive an input sense signal representative of the input of a power converter, wherein the input sense circuit is a current input sense circuit, and wherein the input sense signal representative of the input of the power converter is a current, wherein input sense circuit comprises a high voltage transistor coupled to receive the input sense signal;
- and
- a sense enable circuit coupled to generate a sense enable signal in response to the drive signal, wherein the sense enable signal is coupled to control the input sense circuit to sense the input sense signal for an extended duration of time after the power switch turns OFF.
A power converter, comprising:
- an input winding coupled to receive an input of the power converter;
- an output winding coupled to deliver an output to a load coupled to an output of the power converter;
- a power switch coupled to the input winding of the power converter;
- an isolation circuit coupled to provide galvanic isolation and coupled to sense a switching voltage;
- and
- a power converter controller coupled to the isolation circuit, wherein the power converter controller is further coupled to generate a drive signal coupled to control switching of the power switch to control a transfer of energy from the input of the power converter to the output of the power converter in response to a feedback signal representative of the output of the power converter, wherein the power converter controller includes:
- a switch driver circuit coupled to generate the drive signal to control switching of the power switch to control the transfer of energy from the input of the power converter to the output of the power converter;
- an input sense circuit to receive an input sense signal representative of the input of a power converter, wherein the input sense circuit is a current input sense circuit, and wherein the input sense signal representative of the input of the power converter is a current, wherein input sense circuit comprises a high voltage transistor coupled to receive input sense signal;
- and
- a sense enable circuit coupled to generate a sense enable signal in response to the drive signal, wherein the sense enable signal is coupled to control the input sense circuit to sense the input sense signal for an extended duration of time after the power switch turns OFF.
Dependencies are inferred from the claim text.