Charging apparatus for secondary battery

A charging apparatus for a secondary battery, comprising:

• a power supply circuit connected to a primary winding of a transformer;
• a main winding and a sub winding connected to a secondary side of the transformer;
• a charging circuit connected to the main winding, the charging circuit supplying power to a battery pack to be charged;
• and
• a control circuit connected to the sub winding, the control circuit controlling the charging circuit,
• wherein the charging circuit comprises a LED indicating a standby state or a charge completion state, the LED being lighted at a light-load time of the charging circuit based on a command of the control circuit,
• wherein the LED is, at one end, connected to one end of a resistor, and is, at the other end, connected to the other end of the resistor, and
• wherein the control circuit allows the LED to blink responding to a charge state of the battery pack, controls current not to flow to the resistor when the LED is lighted, and controls current to flow to the resistor when the LED is not lighted.