Switched-capacitor isolated LED driver
A switched-capacitor voltage converter which is particularly well-suited for receiving a line voltage from which to drive current through a series of light emitting diodes (LEDs). Input voltage is rectified in a multi-level rectifier network having switched capacitors in an ascending-bank configuration for passing voltages in uniform steps between zero volts up to full received voltage V.sub.DC. A regulator section, operating on V.sub.DC, comprises switched-capacitor stages of H-bridge switching and flying capacitors. A current controlled oscillator drives the states of the switched-capacitor stages and changes its frequency to maintain a constant current to the load. Embodiments are described for isolating the load from the mains, utilizing an LC tank circuit or a multi-primary-winding transformer.
- Research Organization:
- Univ. of California, Oakland, CA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AR0000114
- Assignee:
- THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (Oakland, CA)
- Patent Number(s):
- 9,295,116
- Application Number:
- 14/293,107
- OSTI ID:
- 1243303
- Resource Relation:
- Patent File Date: 2014 Jun 02
- Country of Publication:
- United States
- Language:
- English
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