CIRCUITRY FOR SUPPLYING ELECTRICAL POWER TO LOADS

摘要

A circuit for supplying power comprises: at least a first transformer, the first transformer comprising a primary winding and a secondary winding; a first circuit portion; and a second circuit portion, the first circuit portion comprising the primary winding of the first transformer, at least a first switch and a first sub-circuit, the first switch and the first sub-circuit arranged in parallel. The first sub-circuit comprises at least a first diode and a second sub-circuit, the first diode and the second sub-circuit arranged in series. The second sub-circuit comprises at least a first capacitor and at least a first load arranged in parallel. The second circuit portion comprises the secondary winding of the first transformer, at least a second diode and a third sub-circuit, the second diode and the third sub-circuit arranged in series. The third sub-circuit comprises at least a second capacitor and at least a second load arranged in parallel, at least one of the first load and the second load comprising at least a first solid state light emitting element, at least a first transistor, at least a first resistor and at least a first operational amplifier. The first solid state light emitting element, the first transistor, and the first resistor arranged in series. A cathode end of the first solid state light emitting element is electrically connected to a source of the first transistor. The first resistor is electrically connected to a collector of the first transistor, and the operational amplifier drives a gate voltage of the first transistor. A reference voltage is provided as a first input to the operation amplifier and a voltage from a node between the collector of the first transistor and the first resistor is a second input to the operational amplifier.