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US 5,796,595 AGranted
Interleaved continuous flyback power converter system
AssigneeAstec International Limited
InventorDavid A. Cross
Life of this patent
Estimating the term…
Abstract
An interleaved flyback electrical power converter system having a plurality of flyback power converters operated in continuous mode, each converter utilizing a power switch operated under zero voltage switching conditions. The interleaved flyback power converter system is highly efficient and compact, and is suitable for use in high power, high frequency applications.
Claims32
An interleaved continuous flyback power converter system for providing power to a load, said system comprising:
- an output port for coupling said system to said load;
- and
- first and second flyback power converters, wherein said converters are coupled in parallel to said output port and operate in continuous mode, and further wherein each said power converter comprises:
- an input port for receiving an input voltage;
- a transformer having a primary winding and a secondary winding, wherein a first terminal of said primary winding is coupled to a first terminal of said input port and further wherein a second terminal of said secondary winding is coupled to a second terminal of said output port;
- a power switch, said power switch having first and second conduction terminals, wherein voltage across said first and second conduction terminals defines a switch voltage, and further wherein said first conduction terminal of said power switch is coupled to a second terminal of said primary winding and said second conduction terminal of said power switch is coupled to a second terminal of said input port, said power switch being switched to alternating ON and OFF states, wherein power is coupled from said input port to said primary winding during said ON states and wherein substantially no power is coupled from said input port to said primary winding during said OFF states, said transformer storing energy during said ON states and releasing energy to the output port during said OFF states, further wherein said switch voltage is substantially zero volts when said power switch is switched to said ON state from said OFF state;
- a series combination of a clamp capacitor and a clamp switch, said series combination having one terminal coupled to the first terminal of said input port and the first terminal of said primary winding, said series combination having a second terminal coupled to said second terminal of said primary winding, said clamp switch having an auxiliary ON state and an auxiliary OFF state;
- and
- a rectifier, wherein a first terminal of said rectifier is coupled to a first terminal of said secondary winding and a second terminal of said rectifier is coupled to a first terminal of said output port such that current is substantially blocked from flowing from said output port to said secondary winding during said ON states of the power switch and is enabled to flow to said output port during said OFF states;
- said system further comprising:
- an output capacitor coupled to said output port;
- and
- control means coupled to each of said clamp switches and each of said power switches for switching said power and clamp switches between said ON and OFF states and said auxiliary ON and OFF states, respectively.
10 more elements
A flyback power converter system for providing power to a load, said system comprising:
- an output port for coupling said system to said load;
- and
- N flyback power converters, where N is an integer greater than two, wherein said N flyback power converters are coupled in parallel to said output port and operated in continuous mode, and further wherein each of said power converters is operated 360/N degrees out of phase with respect to another one of said power converters and each of said power converters comprises:
- an input port for receiving an input voltage;
- a transformer having a primary winding and a secondary winding, wherein a first terminal of said primary winding is coupled to a first terminal of said input port and further wherein a second terminal of said secondary winding is coupled to a second terminal of said output port;
- a power switch, said power switch having first and second conduction terminals, wherein voltage across said first and second conduction terminals defines a switch voltage, and further wherein said first conduction terminal of said power switch is coupled to a second terminal of said primary winding and said second conduction terminal of said power switch is coupled to a second terminal of said input port, said power switch being switched to alternating ON and OFF states, wherein power is coupled from said input port to said primary winding during said ON states and wherein substantially no power is coupled from said input port to said primary winding during said OFF states, said transformer storing energy during said ON states and releasing energy to the output port during said OFF states, further wherein said switch voltage is substantially zero volts when said power switch is switched to said ON state from said OFF state;
- a series combination of a clamp capacitor and a clamp switch, said series combination having one terminal coupled to the first terminal of said input port and the first terminal of said primary winding, said series combination having a second terminal coupled to said second terminal of said primary winding, said clamp switch having an auxiliary ON state and an auxiliary OFF state;
- and
- a rectifier, wherein a first terminal of said rectifier is coupled to a first terminal of said secondary winding and a second terminal of said rectifier is coupled to a first terminal of said output port such that current is substantially blocked from flowing from said output port to said secondary winding during said ON states of the power switch and is enabled to flow to said output port during said OFF states;
- said system further comprising:
- an output capacitor coupled to said output port;
- and
- control means coupled to each of said clamp switches and each of said power switches for switching said power and clamp switches between said ON and OFF states and said auxiliary ON and OFF states, respectively.
10 more elements
Dependencies are inferred from the claim text.