Charging device charging direct current battery

The invention discloses a charging device charging a direct current battery. The charging device comprises a voltage reduction converter unit which is used for inputting direct current voltage comingform a power source and converting the direct current voltage; and when the voltage of the direct current battery is between the preset first voltage lower than the charging complete voltage of the direct current battery and the charging complete voltage, the input power of the variable voltage direct current battery being charged from the first voltage to the charging complete voltage of the direct current battery is input in a step-down converter. The charging device can complete charging of the direct current battery in a short period, and charges the battery at the maximum input powder. 本发明公开了种对直流电池进行充电的充电装置，包括：降压转换器单元，输入来自电源的直流电压并转换该直流电压；其中当直流电池的电压处于低于直流电池的充电完成电压的预定第电压和充电完成电压之间时，根据充电从第电压增加到充电完成电压的可变电压直流电池的输入被输入到降压转换器单元。本发明能够在短时间内完成对直流电池的充电，并以最大输入功率充电。