Charger

The invention discloses a charger, which relates to the charging technology. The charger aims to be a charging and discharging device capable of charging storage batteries with different voltages and discharging the storage batteries. The technical scheme includes that a primary winding of a transformer of the charger is connected with a power source, a tap switch K2 is opposite to various taps of a secondary winding of the transformer, a silicon-controlled rectifier BG2, an ammeter A1 and a safety fuse BX2 are sequentially serially connected onto a circuit between the tap switch K2 and an anode of an output end of the charger, one end of a resistor R1 is connected with a circuit between the tap switch K2 and the silicon-controlled rectifier BG2, one end of a resistor R2 and one end of a variable resistor W1 are connected with the other end of the resistor R1, the resistor R2 is parallelly connected with the variable resistor W1, the other ends of the resistor R2 and the variable resistor W1 are connected wit