| 摘要 |
PURPOSE: A lighting apparatus is provided to satisfy user's desire by controlling lamp output using a microchip such as IGBT. CONSTITUTION: A back waveform converting unit(41) converts an input waveform of a dim level to a reverse waveform. A limit control unit(42) controls the reverse waveform input from the reverse waveform converting unit(41) and a detection signal of over load from a waveform shaping unit(46) to be transmitted to a drive unit(43). The drive unit(43) outputs drive signals in response to the signals from the limit control unit(42). An IGBT unit(44) receives the signals from the drive unit(43), and improves noises of the output by an RCL circuit of an electric sensor unit(45) to be supplied to a load. The electric current sensor unit(45) detects an electric current over the rated value in the output of the load, and transmits the detected signal to the limit control unit(42) where the signal is compared to break power supply, thereby causing the IGBT unit(44) to be in OFF.
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