Patent ID: 9621068
Date: 2017-04-11
CPC Classifications: H02M,H05B,Y02B

Claim:
1. A method of driving a load, the method comprising: a) monitoring an AC input to a rectifier circuit in real-time, wherein said rectifier circuit comprises first and second rectifier circuits; b) turning off a first controllable switch and turning on a second controllable switch when said AC input is in a first state, wherein said first state comprises said AC input being in a positive half cycle and increasing, or said AC input being in said positive half cycle and decreasing while being at least as high as a predetermined threshold value; c) using said AC input to supply power to a load circuit and an output capacitor via said first rectifier circuit when said AC input is in said first state, wherein said first rectifier circuit comprises a first diode and said second controllable switch; d) turning on said first and second controllable switches and using said output capacitor to supply power to said load circuit when said AC input is in a second state, wherein said second state comprises said AC input being in positive half cycle and decreasing to less than said predetermined threshold value; e) turning on said first and second controllable switches and using said output capacitor to supply power to said load circuit when said AC input is in a third state, wherein said third state comprises said AC input being in said negative half cycle and having an absolute value decreasing to be less than said predetermined threshold value; and f) when said AC input is in said second state, maintaining said second controllable switch as on, and turning off said first controllable switch, until said AC input enters a fourth state, in response to a present load driving signal being less than an expected driving signal.