Patent ID: 9214855
Filing Date: 2015-12-15
Classification: H02M,Y02B

Abstract:
1. A constant current power factor correction circuit, comprising: an input capacitor configured to receive an input current from a constant current source and produce an input voltage; a rectifier bridge configured to receive the input current and full-wave rectify the input current; a controller, wherein the controller senses the input current and the input voltage and continuously monitors the input voltage and compares the input voltage to a reference voltage; a switching device coupled to the controller, wherein the switching device is switchable between a first state and an second state, wherein when the switching device is in the first state, the input capacitor is charged from the input current and the input voltage rises, and when the switching device is in the second state, the input capacitor is drained and the input voltage drops, wherein the controller switches the switching device from the first state to the second state when the input voltage reaches the reference voltage; and a DC output bus providing an output voltage, wherein the output voltage is a conditioned form of the input voltage, wherein the input voltage is shaped to be in phase with the input current from the constant current source.