Electronic switching ballast for a fluorescent lamp
    2.
    发明授权
    Electronic switching ballast for a fluorescent lamp 失效
    电子开关镇流器用于荧光灯

    公开(公告)号:US5010278A

    公开(公告)日:1991-04-23

    申请号:US365865

    申请日:1989-06-14

    申请人: Sung H. Kang

    发明人: Sung H. Kang

    IPC分类号: H05B41/282

    CPC分类号: H05B41/2828 Y10S315/07

    摘要: An electronic switching ballast for fluorescent lamp having a rectifying circuit, a square generator, a phase discriminator, a switching time differentiating circuit and a wave shaping circuit. The alternating current input signal provided to the ballast is rectified by the rectifying circuit to a direct current signal. The square generator generates a square wave signal in reference to the direct current signal. The phase discriminator compares a feedback signal from the wave shaping circuit with a reference signal corresponding to the direct current signal to provide a full-wave rectified signal. The switching time differentiating circuit combines the square wave signal and full-wave rectified signal, and differentiates the combined signal to generate a pair of pulsed signals. The pulsed signals are out of phase with respect to one another. The wave shaping circuit provides a full-wave sinusoidal signal in reference to the pair of pulsed signals to an external circuit and feeds at least a portion of the signal back to the phase discriminator.