Patent ID: 7994736

Claim:
A cold cathode fluorescent lamp inverter apparatus comprising: a DC power source configured to rectify an AC voltage of an AC power source; a first series circuit connected to both ends of the DC power source and including a first switching element and a second switching element; a second series circuit connected between a connection point of the first and second switching elements and one of the ends of the DC power source and including a primary winding of a transformer, a reactor, and a capacitor; at least one cold cathode fluorescent lamp having a first end connected to a first end of a secondary winding of the transformer; a current detector having a first end connected to a second end of the at least one cold cathode fluorescent lamp and a second end connected to a second end of the secondary winding of the transformer, the current detector being configured to detect a value of a current passing through the at least one cold cathode fluorescent lamp; and a controller configured to turn on/off the first and second switching elements alternately with each other according to a measurement signal so that the current passing through the at least one cold cathode fluorescent lamp may have a predetermined value, wherein at least one of the current detector and controller is configured to detect a ripple component direct from the DC power source, and provide the measurement signal, the ripple component in the detected current value having been reduced in the measurement signal.