Abstract: A circuit structure applied to a driver of an electronic device and for switching power supply units between series-connected and parallel-connected configurations includes an electricity output portion having a first end and a second end, two power supply units, and a switch unit. Each power supply unit includes an electricity element having a positive electrode and a negative electrode, a front diode having an anode connected to the positive electrode and a cathode electrically connected to the first end, and a rear diode having a cathode connected to the negative electrode and an anode electrically connected to the second end. The switch unit has a first end and a second end respectively connected to the positive electrode of one electricity element and the negative electrode of the other electricity element, and a closed-circuit state and an open-circuit state when the electricity elements are respectively series-connected or parallel-connected to output electricity.

Abstract: A circuit for regulating output power varies the output power based on the time that a connection to an AC power source is open. A microprocessor determines the open-circuit time of the input power source and varies a power source signal in response to the open-circuit time. The power source signal is, in turn, supplied to a trigger circuit that supplies power to a load to control the output power.