Patent ID: 8054008

Claim:
A power converter comprising: a first direct current converter configured to convert alternating current voltage from an alternating current power supply, into direct current voltage, and to correct a power factor; an LED group load configured to emit light with predetermined direct current voltage; and a second direct current converter configured to electrically isolate the first direct current converter and the LED group load from each other, and to convert the direct current voltage from the first direct converter, into the predetermined direct current voltage and then supply the predetermined direct voltage to the LED group load, wherein the second direct current converter includes: a transformer configured to isolate a primary side and a secondary side from each other; a current detection circuit disposed on the secondary side of the transformer, and configured to detect current flowing into the LED group load; an error amplifier configured to amplify an error between a current value detected by the current detection circuit and a reference current value; a signal transmission isolation element configured to transmit a control signal based on an output signal from the error amplifier, to the primary side; and a switching element disposed on the primary side, and configured to transfer power to the secondary side through the transformer by being turned on/off according to the control signal transmitted from the signal transmission isolation element.