Loosely regulated feedback control for high efficiency isolated DC-DC converters

摘要

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.

主权项

1. 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.