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US 9,143,047 B2Granted
Loosely regulated feedback control for high efficiency isolated DC-DC converters
AssigneeTDK-Lambda Corporation
InventorCarl Wildrick
Life of this patent
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Abstract
The improved DC-DC converter apparatus includes a primary side circuit and a secondary side circuit that is galvanically isolated from the primary. The primary side induces a voltage in the secondary side that provides an output voltage for driving POLs. A flux-control device measures the transformer primary side flux to control the primary side duty cycle, thereby loosely regulating the output voltage of the secondary side circuit.
Claims10
An isolated DC-DC converter system comprising:
- a primary side circuit;
- a secondary side circuit;
- a transformer comprising at least one primary side winding and a secondary side winding;
- and
- a flux-control device;
- wherein
- said primary side circuit is configured to accept an input voltage;
- said secondary side circuit is galvanically isolated from said primary side circuit by said transformer;
- said secondary side circuit is configured to generate an output voltage determined by a duty cycle of said primary side circuit;
- said flux-control device is configured to vary said duty cycle of said primary side circuit based only upon a measured volt-second of a monitored primary side winding of said transformer;
- and
- said flux-control device is configured to loosely regulate said output voltage by adjusting said duty cycle of said primary side circuit.
9 more elements
An isolated DC-DC converter method-comprising:
- in an isolated DC-DC converter comprising a primary side circuit galvanically isolated from a secondary side circuit, a galvanic isolation provided by a transformer comprising at least one primary winding and a secondary winding,
- measuring a volt-second of a monitored primary side winding of said transformer;
- and
- loosely regulating a voltage output of said secondary side circuit by altering a duty cycle of said monitored primary side circuit based only on said volt-second measurement.
1 more element
Dependencies are inferred from the claim text.