Power supplies having synchronous and asynchronous modes of operation
First Claim
1. A power supply comprising:
- an output terminal for supplying an output current to a load;
a transformer having a primary winding and a secondary winding, the secondary winding having a first terminal at one end of the secondary winding and a second terminal at an opposite end of the secondary winding;
a first diode coupled between the first terminal of the secondary winding and the output terminal;
a second diode coupled between the second terminal of the secondary winding and the output terminal;
a first switch coupled between the first terminal of the secondary winding and the output terminal;
a second switch coupled between the second terminal of the secondary winding and the output terminal; and
a controller coupled to the first switch and the second switch, the controller configured to control the power supply in an asynchronous mode when the output current is below a defined threshold by turning off the first switch and the second switch so current flows to the output terminal through the first diode and the second diode, and to control the power supply in a synchronous mode when the output current is above the defined threshold by alternately turning on the first switch and the second switch so current flows to the output terminal through the first switch and the second switch.
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Accused Products
Abstract
The present disclosure relates to power supplies and control methods for power supplies. Example power supplies include an output terminal, a transformer having a secondary winding including a first terminal and a second terminal, first and second diodes coupled between the output terminal and the first and second terminals, respectively, first and second switches coupled between the output terminal and the first and second terminals, respectively, and a controller coupled to the first switch and the second switch. The controller is configured to control the power supply in an asynchronous mode when output current is below a defined threshold so current flows to the output terminal through the first diode and the second diode, and to control the power supply in a synchronous mode when output current is above the defined threshold so current flows to the output terminal through the first switch and the second switch.
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Citations
20 Claims
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1. A power supply comprising:
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an output terminal for supplying an output current to a load; a transformer having a primary winding and a secondary winding, the secondary winding having a first terminal at one end of the secondary winding and a second terminal at an opposite end of the secondary winding; a first diode coupled between the first terminal of the secondary winding and the output terminal; a second diode coupled between the second terminal of the secondary winding and the output terminal; a first switch coupled between the first terminal of the secondary winding and the output terminal; a second switch coupled between the second terminal of the secondary winding and the output terminal; and a controller coupled to the first switch and the second switch, the controller configured to control the power supply in an asynchronous mode when the output current is below a defined threshold by turning off the first switch and the second switch so current flows to the output terminal through the first diode and the second diode, and to control the power supply in a synchronous mode when the output current is above the defined threshold by alternately turning on the first switch and the second switch so current flows to the output terminal through the first switch and the second switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of operating a power supply, the power supply having an output terminal, a transformer having a primary winding and a secondary winding, the secondary winding having a first terminal at a first end of the secondary winding and a second terminal at an opposite end of the secondary winding, a first diode coupled between the first terminal and the output terminal, a second diode coupled between the second terminal and the output terminal, a first switch coupled between the first terminal and the output terminal, and a second switch coupled between the second terminal and the output terminal, the method comprising:
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sensing an output current at the output terminal of the power supply; when the sensed current is below a defined threshold, operating the power supply in an asynchronous mode by turning off the first switch and the second switch so current flows to the output terminal through the first diode and the second diode; and when the sensed current is above a defined threshold, operating the power supply in a synchronous mode by alternately turning on the first switch and the second switch so current flows to the output terminal through the first switch and the second switch. - View Dependent Claims (17, 18, 19, 20)
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Specification