Synchronous rectifiers with reduced power loss and the method thereof
AssigneeChengdu Monolithic Power Systems Co., Ltd.
InventorLei Miao
Life of this patent
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Abstract
A synchronous rectifier monitors a driven signal of a synchronous switch. If the driven signal is provided within a set time length, the driven signal is latched off, to make the system enter light load mode.
Claims18
A synchronous rectifier used in an electronic circuit, wherein the electronic circuit has a transformer including a primary winding and a secondary winding, the synchronous rectifier comprising:
- a synchronous switch, coupled to the secondary winding of the transformer, the synchronous switch being controlled to be periodically turned on and turned off in response to a driven signal to convert an input voltage to an output voltage;
- wherein
- the driven signal is latched off if the driven signal is not provided within a first set time period, so as to have the synchronous rectifier enter light load mode.
A synchronous rectifier used in an electronic circuit, wherein the electronic circuit has a transformer including a primary winding and a secondary winding, the synchronous rectifier comprising:
- a synchronous switch, coupled to the secondary winding of the transformer, the synchronous switch being periodically turned on and turned off in response to a driven signal to convert an input voltage to an output voltage;
- and
- a light load comparator, configured to compare the driven signal with a light load voltage threshold, wherein the driven signal is latched off if the driven signal is lower and remains lower than the light load voltage threshold for a first set time period, so as to have the synchronous rectifier enter light load mode.
A synchronous rectifying method used in an electronic circuit, comprising:
- receiving an input voltage at a primary side of a transformer;
- periodically turning on and turning off a synchronous switch in response to a driven signal, to generate an output voltage;
- and
- monitoring the driven signal, if the driven signal is not provided within a first set time period, latching off the driven signal, to have the electronic circuit enter light load mode;
- otherwise, continuing periodically turning on and turning off the synchronous switch.
Dependencies are inferred from the claim text.