CHARGER

摘要

The charger includes a voltage conversion circuit that generates a DC voltage, output terminals that supply the DC voltage to a charging target, an auxiliary power supply interposed between a pair of electric paths connecting the output terminals and the voltage conversion circuit, a voltage detection circuit that detects a terminal voltage at the auxiliary power supply, a voltage conversion control unit operated by receiving power supply from the auxiliary power supply, the voltage conversion control unit configured to output a control signal that puts the voltage conversion circuit into a starting state in a period during which charging of the auxiliary power supply is necessary in a disconnected state in which the charging target is not connected to the output terminals, and that puts the voltage conversion circuit into a stopping state in a period during which the charging of the auxiliary power supply is not necessary, and a detection mechanism that detects a change in state from the disconnected state to a connected state in which the charging target is connected to the output terminals.

主权项

1. A charger that converts a supply voltage from an AC power supply and charges a charging target, the charger comprising:
a voltage conversion circuit configured to be connected to the AC power supply and to generate a DC voltage from the supply voltage in a starting state; a pair of output terminals configured to supply the DC voltage output from the voltage conversion circuit to the charging target; an auxiliary power supply interposed between a pair of electric paths connecting each of the output terminals and the voltage conversion circuit, and configured to receive power supplied from the voltage conversion circuit; a voltage detection circuit configured to detect a terminal voltage at the auxiliary power supply and to output a detection result; a voltage conversion control unit operated by receiving power supply from the auxiliary power supply, the voltage conversion control unit configured to
receive the detection result, andoutput a control signal that puts the voltage conversion circuit into the starting state in a period during which charging of the auxiliary power supply is necessary in a disconnected state in which the charging target is not connected to the pair of output terminals, and that puts the voltage conversion circuit into a stopping state in a period during which the charging of the auxiliary power supply is not necessary; and a detection mechanism configured to detect a change in state from the disconnected state to a connected state in which the charging target is connected to the pair of output terminals, wherein a first voltage that is an output voltage from the auxiliary power supply differs from a second voltage that is an input voltage to the charging target, and the voltage conversion circuit separately outputs the first and second voltages,wherein
the voltage conversion circuit includes a converter that converts the supply voltage into the first and second voltages, the converter includes:
a power transformer that includes a primary winding and a secondary winding provided with a center tap;a primary rectifier circuit that rectifies the supply voltage to generate the DC voltage;an AC voltage generator that generates an AC voltage based on the DC voltage output from the primary rectifier circuit, and supplies the AC voltage to the primary winding; andfirst and second secondary rectifier circuits that generate the first and second voltages by rectifying AC voltage induced in the secondary winding, respectively, the first secondary rectifier circuit is connected to both ends of the secondary winding and generates the first voltage, and the second secondary rectifier circuit is connected to one end and the center tap of the secondary winding and generates the second voltage.