Low-cost self-oscillating driver circuit

摘要

A driver circuit for powering a load is disclosed. The driver circuit includes a self-oscillating half-bridge circuit, a resonant driver in electrical communication with the self-oscillating half-bridge circuit, and a DC voltage supply in electrical communication with the resonant driver. The self-oscillating half-bridge circuit is configured to generate a high-frequency AC signal. The resonant driver is configured to limit a current of the high-frequency AC signal and produce a limited output voltage based on the high-frequency AC signal. The DC voltage supply is configured to rectify the limited output voltage into a DC output voltage including a substantially constant current for powering the load.

主权项

1. A driver circuit for powering a load, comprising:
a self-oscillating half-bridge circuit generating a high-frequency AC signal, wherein the self-oscillating half-bridge circuit comprises a transformer including a first winding, a second winding, and a third winding, and wherein the first winding and the second winding include opposite polarities; a resonant driver in electrical communication with the self-oscillating half-bridge circuit, the resonant driver circuit limiting a current of the high-frequency AC signal and produce a limited output voltage based on the high-frequency AC signal, the resonant driver including a capacitor connected directly to the third winding of the transformer in series, wherein the capacitor and the third winding of the transformer are connected in parallel with the load; and a DC voltage supply in electrical communication with the resonant driver rectifying the limited output voltage into a DC output voltage including a substantially constant current for powering the load.