High efficiency inductor-less off-line LED driver

摘要

The present document relates to providing power for driving SSL devices. A power converter converts a varying input voltage to supply an output voltage to a SSL device in series with a current source. The power converter comprises one or more capacitors; a plurality of switches to couple the capacitors in a plurality of configurations. A control unit operates the power converter in a plurality of operational modes providing a corresponding plurality of different conversion ratios between the input/output voltages. The operational modes comprise a first phase and a second phase, during which the capacitors are differently arranged. The control unit controls the switches to alternate between the phases at a commutation cycle rate. The control unit sets the operational mode based on the varying input voltage.

主权项

1. A solid state lighting (SSL) light bulb assembly comprising:
a SSL device; a driver circuit, converting supply electricity received through an electrical connection module into a controlled drive current for the SSL device, comprising:
a first power converter converting a varying input voltage at an input of the power converter into an output voltage at an output of the power converter supplying the output voltage to the solid state lighting, comprising;
one or more capacitors;a plurality of switches coupling said one or more capacitors with one another, with the input and/or with the output of the power converter according to a plurality of configurations; anda control unit operating the power converter in a plurality of operational modes providing a corresponding plurality of different conversion ratios between the input voltage and the output voltage of the power converter, wherein a first operational mode of said plurality of operational modes comprises a first phase, during which the one or more capacitors are arranged in a first configuration from said plurality of configurations, and a second phase, during which the one or more capacitors are arranged in a different second configuration from the plurality of configurations, and a current source at the output of the first power converter, supplying a constant current to the SSL device, when the SSL device is coupled to the output of the first power converter.