System and method for controlling a synchronous rectifier
AssigneeToyota Motor Engineering & Manufacturing North America, Inc.
InventorsJongwon SHIN, Masanori ISHIGAKI
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Abstract
A power system includes DC-DC power conversion circuitry that has a first switch and a second switch on either side of a transformer, and the second switch is operates as a synchronous rectifier. Power transfer from a primary side to secondary side of the DC-DC power conversion circuitry is controlled by operating the first switch. A drive signal for the second switch is calculated based on a sensed transformer winding current, and operation of the second switch is controlled based on the drive signal.
Claims20
A system comprising:
- DC-DC power conversion circuitry including a first switch and a second switch on either side of a transformer wherein the second switch is configured to operate as a synchronous rectifier, the transformer being connected to the first and second switches such that currents and voltages in both windings of the transformer are in phase;
- and
- control circuitry configured to
- control power transfer from a primary side to secondary side of the DC-DC power conversion circuitry via the first switch,
- calculate a drive signal for the second switch based on a sensed transformer winding current, and
- control operation of the second switch based on the drive signal.
A method comprising:
- controlling power transfer from a primary side to secondary side of DC-DC power conversion circuitry including a first switch and a second switch on either side of a transformer wherein the second switch is configured to operate as a synchronous rectifier via the first switch, the transformer being connected to the first and second switches such that currents and voltages in both windings of the transformer are in phase;
- calculating a drive signal for the second switch based on a sensed transformer winding current;
- and
- controlling operation of the second switch based on the drive signal.
A system controller comprising:
- circuitry configured to
- control power transfer from a primary side to secondary side of DC-DC power conversion circuitry including a first switch and a second switch on either side of a transformer wherein the second switch is configured to operate as a synchronous rectifier via the first switch, the transformer being connected to the first and second switches such that currents and voltages in both windings of the transformer are in phase;
- calculate a drive signal for the second switch based on a sensed transformer winding current;
- and
- control operation of the second switch based on the drive signal.
Dependencies are inferred from the claim text.