Power supply apparatus
An object of the present invention is to provide a charging apparatus having high efficiency of charging a battery by inputting an alternating current voltage. A charging apparatus that charges a direct current battery includes a step-down converter unit to which a direct current voltage from a power supply is input and that converts the direct current voltage, and when a voltage of the direct current battery is between a predetermined first voltage smaller than a charge completion voltage of the direct current battery and the charge completion voltage, a variable voltage that increases from the first voltage to the charge completion voltage in accordance with charging of the direct current battery is input to the step-down converter unit.
1. A charging apparatus that charges a direct current battery, comprising:
a step-down converter unit that is configured to convert a direct current voltage input from a power supply to which a direct current voltage from a power supply is input and that converts the direct current voltage, wherein when a voltage of the direct current battery is between a predetermined first voltage lower than a charge completion voltage of the direct current battery and the charge completion voltage, and an input voltage to the step-down converter unit is controlled so as to increase from the first voltage to the charge completion voltage as the direct current battery charges; and
a step-up converter unit to which a direct current voltage from a power supply is input and that converts the direct current voltage, wherein
the direct current voltage converted by the step-up converter unit is input in the step-down converter unit, and the first voltage is input in the step-up converter unit,
when the voltage of the direct current battery is lower than the first voltage, the step-down converter unit is subjected to voltage control such that an input voltage to the step-down converter unit is the first voltage, and
the step-up converter unit is controlled such that power supplied to the direct current battery is constant power.
2. The charging apparatus according to claim 1 ,
wherein when the voltage of the direct current battery is lower than the first voltage, the first voltage is input to the step-down converter unit.
3. The charging apparatus according to claim 1 ,
wherein when the voltage of the direct current battery is lower than the first voltage, the step-up converter unit is subjected to the voltage control such that the input voltage to the step-down converter unit is the first voltage.
4. The charging apparatus according to claim 3 ,
wherein when the voltage of the direct current battery is lower than the first voltage, the step-down converter unit is subjected to constant power control such that power supplied to the direct current battery is constant.
5. The charging apparatus according to claim 3 ,
wherein when the voltage of the direct current battery is between the first voltage and the charge completion voltage, the step-up converter unit is subjected to the constant power control such that the power supplied to the direct current battery is constant.
6. The charging apparatus according to claim 1 ,
wherein when the voltage of the direct current battery is the charge completion voltage or higher, the step-up converter unit is subjected to constant voltage control such that a voltage supplied to the direct current battery is constant.
7. The charging apparatus according to claim 1 , further comprising
an AC-DC converter unit that converts an alternating current voltage into a direct current voltage,
wherein the direct current voltage converted by the AC-DC converter unit is input in the step-up converter unit.
8. The charging apparatus according to claim 1 ,
wherein the step-down converter unit includes an operation mode in which an input side and an output side of the step-down converter unit is short-circuited in a direct current manner.
9. A charging system comprising:
a direct current battery; and
the charging apparatus that charges the direct current battery according to claim 1 .
10. A charging apparatus that charges a direct current battery, comprising:
a step-down converter unit that is configured to convert a direct current voltage input from a power supply, to which a direct current voltage from a power supply is input and that converts the direct current voltage, wherein when a voltage of the direct current battery is between a predetermined first voltage lower than a charge completion voltage of the direct current battery and the charge completion voltage, a variable voltage that increases from the first voltage to the charge completion voltage in accordance with charging of the direct current battery is input to the step-down converter unit;
a step-up converter unit to which a direct current voltage from a power supply is input and that converts the direct current voltage, wherein
the direct current voltage converted by the step-up converter unit is input in the step-down converter unit,
the first voltage is input in the step-up converter unit,
when the voltage of the direct current battery is lower than the first voltage, the step-down converter unit is subjected to voltage control such that an input voltage to the step-down converter unit is the first voltage, and
when the voltage of the direct current battery is between the first voltage and the charge completion voltage, the step-down converter unit is subjected to the voltage control such that the input voltage to the step-down converter unit is the voltage of the direct current battery.
11. The charging apparatus according to claim 10 ,
wherein when the voltage of the direct current battery is lower than the first voltage, the first voltage is input to the step-down converter unit.
12. The charging apparatus according to claim 10 ,
wherein the step-up converter unit is controlled such that power supplied to the direct current battery is constant power.
13. The charging apparatus according to claim 10 ,
wherein when the voltage of the direct current battery is lower than the first voltage, the step-up converter unit is subjected to the voltage control such that the input voltage to the step-down converter unit is the first voltage.
14. The charging apparatus according to claim 13 ,
wherein when the voltage of the direct current battery is lower than the first voltage, the step-down converter unit is subjected to constant power control such that power supplied to the direct current battery is constant.
15. The charging apparatus according to claim 13 ,
wherein when the voltage of the direct current battery is between the first voltage and the charge completion voltage, the step-up converter unit is subjected to the constant power control such that the power supplied to the direct current battery is constant.
16. The charging apparatus according to claim 10 ,
wherein when the voltage of the direct current battery is the charge completion voltage or higher, the step-up converter unit is subjected to constant voltage control such that a voltage supplied to the direct current battery is constant.