Filament preheating circuit design of electronic ballast There are two main ways to preheat the filament: ① Current filament preheating: In this preheating working mode, a fixed filament preheating current is passed through the filament of the lamp tube. ② Voltage filament preheating: In this preheating working mode, a certain filament preheating voltage is added to the filament of the lamp tube. If the lamp tube is dimmed to a lower brightness value, the filament current will be larger.
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