| 摘要 |
A lamp dimmer circuit for a high intensity discharge lamp includes an auto transformer, a power factor correction capacitor, a reactor ballast, a solid state phase control current module, a dimming control, a high frequency power supply, a coupling transformer, a high frequency by pass capacitor and a lamp. The high frequency low current source formed by the high frequency by pass capacitor, coupling transformer and high frequency power supply act to maintain the lamp arc even with variations in line voltage.
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