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OwnerMarkus Zeigler, Andrew Johnsen +2inventors
InventorsMarkus Zeigler, Andrew Johnsen, Satish Chandupatla, Yaping-Abner Liu
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A PFC flyback converter topology is disclosed. The topology can be implemented in a single-stage and is particularly useful in driving dimmable solid state light sources in lighting applications, though other applications susceptible to instability at very low loading conditions may also benefit. Stable operation is achieved over a broader range of loading using the converter topology as provided herein. In a dimmable lighting application, stable operation (e.g., flicker-free lighting) is achieved at very low dimming levels (e.g., where the load is less than 10% full load). In some topologies, a serial arrangement including a stabilization network and a switch is connected across the solid state light sources or other load. A microcontroller unit controls the duty cycle of the switch to selectively steer excess current from the solid state light sources to the stabilization circuit, at very low dimming conditions.
A power converter for driving a variable load, the power converter comprising:
A method comprising:
A lighting system comprising:
A computer program product including one or more non-transitory machine-readable mediums encoded with instructions that, when executed by one or more processors, cause a process to be carried out to operate a single-stage power converter during a low load condition, the single-stage power converter including a stabilization circuit, the stabilization circuit to couple in parallel to the load, the process comprising:
A microcontroller unit (MCU) to controlling a single-stage power converter during a low load condition, the single-stage power converter including a stabilization circuit, the stabilization circuit to couple in parallel to the load, the MCU configured to:
Dependencies are inferred from the claim text.