Power-supply circuit for DC appliance

A power-supply circuit for a DC appliance, comprising:

• an input unit including a first terminal and a second terminal so as to receive an input DC current from a DC power source;
• an output unit including a third terminal and a fourth terminal to output the input DC current entered by the input unit to a load;
• a connection unit, including a first conductive line and a second conductive line so as to interconnect the input unit and the output unit;
• a rectifier unit including first to fourth diodes coupled as a bridge diode format so as to rectify the input DC current from the DC power source in a predetermined direction;
• a condenser unit that is connected in parallel to the rectifier unit so as to be charged with a voltage in response to the rectified current, and discharges the charged voltage to the output unit from a second time point at which the input DC current is abruptly changed;
• and
• an inductor unit that is connected in series to the rectifier unit and the condenser unit interconnected in parallel to prevent an abrupt increase of DC current exceeding a predetermined current, in such a manner that the input DC current is gradually increased to the predetermined current from a first time point at which the input DC current is applied, wherein the inductor unit is connected between the output unit and the condenser unit,
• wherein the second time point at which the DC current is abruptly changed is a time point at which application of the DC input is interrupted,
• wherein the rectifier unit flows back a residual current present in the DC-appliance power-supply circuit to the output unit when the DC current input is stopped, such that a current and voltage of the DC-appliance power-supply circuit are gradually reduced, thereby preventing an arc phenomenon generated when the current is leaked to outside of the DC-appliance power-supply circuit.