| 摘要 |
PURPOSE:To accurately drive a load with an a.c. power supply by responding to the output of a pulse signal output means, applying power to the road when the output is in a specific level and producing an output control signal at a predetermined time duration per bit of a control data at a half cycle. CONSTITUTION:Plural kinds of operating-power level data of a load 12 are produced as control data per plurality of bits from a control-data output means per half cycle of a an a.c. power supply 13. The control data are stored in a pulse signal output means. A pulse signal modulated in pulse width modulation corresponding to a control data per bit is produced by the pulse signal output means every time when a output-control signal produced several times from the output-control signal generation means is applied to the pulse signal output means at a half cycle of drive power. The pulse signal is fed to a drive means 14 to apply power to the load 12 when the pulse signal is in a specific level. A detection signal is applied to an output control signal generation means by a half cycle detection means 18 per each half cycle of the drive cycle to produce an output-control signal at a different predetermined time duration per bit of the control data at a half cycle. |
