High efficiency DC/DC converter and controller

摘要

Systems, methods, and devices for use in a DC/DC converter. A circuit uses a full-bridge power semiconductor subcircuit along with a high power transformer subcircuit, a diode bridge subcircuit, and a parallel capacitor to provide galvanic isolation and boost the voltage from a power source such as a photovoltaic panel. To ensure zero voltage switching for the power semiconductors, either a passive auxiliary subcircuit or an inductor coupled in parallel to a transformer in the transformer subcircuit may be used. A controller which derives its timing signals from the transformer primary current is used to control the timing of the power semiconductors in the circuit. The circuit and its controller allows for self-adjusting regardless of load and uses the entire switching cycle to be used for power transfer.

主权项

1. A circuit for use as a DC/DC converter, the circuit comprising:
a full-bridge subcircuit coupled in parallel to an input, said full-bridge subcircuit including a plurality of power semiconductors arranged in a bridge configuration; a high frequency transformer subcircuit coupled to said full-bridge subcircuit; a diode bridge subcircuit coupled to said transformer subcircuit; a parallel capacitor coupled in parallel to said diode bridge subcircuit; a subcircuit for providing reactive current for said power semiconductors for zero voltage switching of said semiconductors;wherein
said parallel capacitor is coupled to an output of said converter; said subcircuit for providing reactive current is a single auxiliary subcircuit coupled to said full bridge subcircuit; said single auxiliary subcircuit being coupled directly between one of said plurality of power semiconductors in said full bridge subcircuit and ground; said single auxiliary subcircuit consists of an auxiliary inductor and an auxiliary capacitor coupled in series to one another.