| 摘要 |
Load power control circuits for single HID luminaires include both retrofit circuitry and "new manufacture" circuitry for connection to both controlled-voltage and controlled-current ballast circuits. A suitable such control circuit may be substituted for the capacitor in the capacitor-control type of ballast circuit. Control is effected by a microcontroller that controls selective switching by associated triacs of one or more capacitors connected in parallel across the ballast circuit. The reactor-control type of control circuit is interposed between the line supply and the ballast circuit, and may include parallel-connected pairs of opposed (reverse-coupled) silicon controlled rectifiers operating under the control of the microprocessor.
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