| 摘要 |
PROBLEM TO BE SOLVED: To provide a load control apparatus which attains downsizing of components constituting a third power source section while enabling a large current as a charging current of a buffer capacitor, and is capable of reducing noise generation or load current vibration by reducing, as further as possible, an inter-switch voltage of the load control apparatus, when the buffer capacitor is completely charged. SOLUTION: A third power source section 16 has a zero-cross detector 16a for detecting 0V (zero-cross point) of an output voltage from a rectifier 12, a voltage detector 16b for detecting a terminal voltage of a buffer capacitor 14a, and a serial circuit of a thyristor element 16c and an MOSFET element 16d. When the zero-cross point is detected, a controller 13 outputs a trigger signal to the thyristor element 16c and conducts the MOSFET element 16d. When it is detected that the terminal voltage of the buffer capacitor 14a reaches a predetermined threshold, the controller 13 non-conducts the MOSFET element 16d. COPYRIGHT: (C)2011,JPO&INPIT
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