Patent ID: 9356505
Filing Date: 2016-05-31
CPC Classification: H02M,Y02B

Claim Text:
1. A power supply circuit comprising: a switching voltage regulator connectable to a load, wherein the power supply circuit is configured for selectively supplying the switching voltage regulator with one of a first input voltage and a second input voltage in response to a control signal indicative of an operative state of the load such that the switching voltage regulator is switched between a working state in response to the first input voltage and a standby state in response to the second input voltage, a voltage converting element having an input terminal connected to a voltage bus for providing an input voltage to the voltage converting element and having an output terminal electrically connected to an input terminal of the switching voltage regulator, the voltage converting element being configured to convert the input voltage to an output voltage that is output to the switching voltage regulator via the output terminal, wherein a value of the output voltage of the voltage converting element is equal to the second input voltage of the switching voltage regulator, a bypass line having a first end connected to the voltage bus and a second end connected to a first terminal of a switching element for electrically connecting the bypass line to said input terminal of the switching voltage regulator, and a switch controlling element for opening and closing the switching element based on the control signal, wherein the voltage converting element is configured such that it enters a deactivated mode when the control signal indicates a working state of the load, the voltage converting element is further configured such that it enters an activated state when the control signal indicates a standby state of the load, wherein when the voltage converting element enters its activated state, the voltage converting element converts the input voltage to the output voltage and outputs the output voltage at its output terminal, the switch controlling element is configured such that it operates the switching element so that the bypass line is electrically connected to the input terminal of the switching voltage regulator when the control signal indicates the working state of the load, and the switch controlling element is configured such that it operates the switching element so that the bypass line is electrically disconnected from the input terminal of the switching voltage regulator when the control signal indicates the standby state of the load.