Patent ID: 8427008

Claim:
An electronic power supply circuit, comprising: a step-up converter structured to receive an input voltage and to convert the input voltage into first and second output voltages to power first and second circuit branches, respectively; a timer circuit coupled to the step-up converter and configured to generate timer signals configured to control the converter to alternately generate the first output voltage to power the first circuit branch and the second output voltage to power the second circuit branch; a regulation circuit configured to regulate overvoltages across an output capacitor during commutations between the first and second output voltages, the regulation circuit including: a first MOSFET transistor configured to electrically couple the first circuit branch to ground, the first MOSFET transistor having a gate; a second MOSFET transistor configured to electrically couple the second circuit branch to ground, the second MOSFET transistor having a gate; a first operational amplifier configured to provide a first gate signal to the gate of the first MOSFET transistor; and a second operational amplifier configured to provide a second gate signal to the gate of the second MOSFET transistor; and a commutation circuit configured to activate, in accordance with the timer signals from the timer circuit, the step-up converter, the commutation circuit including: a first comparator configured to compare the first gate signal with the input voltage and to provide a first activation signal to the step-up converter in response to the first gate signal reaching the input voltage; and a second comparator configured to compare the second gate signal with the input voltage and to provide a second activation signal to the step-up converter in response to the second gate signal reaching the input voltage.