High voltage synchronous rectifier controller
AssigneeHoneywell International Inc.
InventorsJOSEPH MAROTTA, XAVIER ENRIQUEZ, STANISLAV SUCHOVSKY, STEVEN LAWSON
Life of this patent
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Abstract
A power supply may comprise a pulse-width-modulation (PWM) controller; a synchronous rectifier having a forward metal oxide field effect transistor (MOSFET) and a catch MOSFET; a forward gate driver; a catch gate driver; and the PWM controller connected so that a low output of the PWM controller facilitates operation of the catch MOSFET and so that the low output precludes operation of the forward MOSFET. The power supply may include a self powered synchronous rectifier that may be constructed with delay times that are independent of lot-to-lot and temperature-related timing variations of MOSFETS.
Claims20
A power supply comprising:
- a pulse-width-modulation (PWM) controller;
- a synchronous rectifier having a forward metal oxide field effect transistor (MOSFET) and a catch MOSFET;
- a forward gate driver for driving a gate of the forward MOSFET;
- a catch gate driver for driving a gate of the catch MOSFET;
- and
- the PWM controller connected so that a low output of the PWM controller facilitates operation of the catch MOSFET and so that the low output precludes operation of the forward MOSFET.
A synchronous rectifier comprising:
- a forward MOSFET;
- a forward gate driver for driving a gate of the forward MOSFET;
- a catch MOSFET;
- a catch gate driver for driving a gate of the catch MOSFET;
- and wherein an output pin of the catch gate driver is connected with a first input pin of the forward gate driver.
A method of performing rectification comprising the steps of:
- applying a power demand signal to a PWM controller;
- applying an output signal from the PWM controller to a driver for a forward MOSFET and a driver for a catch MOSFET;
- activating a catch MOSFET responsively to a low output signal from the PWM controller;
- and
- blocking activation of a forward MOSFET responsively to the low output signal so that cross conduction of the forward MOSFET and the catch MOSFET is precluded.
Dependencies are inferred from the claim text.