TH6786C3 - Fully electrically independent closed-loop dimming control circuit for dimmable electronic ballasts. - Google Patents

Abstract

DC60 (26/10/54) electrically isolated closed-loop dimming control circuit for electronic ballasts for ballasts. Dimmable electronic last according to this invention. Fluorescent lamp current regulation is used by feedback the lamp current through a high frequency transformer. And control current with an op-amp circuit that provides the output of the circuit Controlled as current or voltage via optical device (OPTO Device) can receive dimmer command that is 1-10 volt control DC voltage or control resistance. External with a high value of 1 megohm or more Or if not continue The dimmer command provides the maximum dimmer voltage that the ballast can operate normally. The dimming control circuit based on this invention offers high user safety. It is independent from the high voltage of the ballast system and will not damage the ballast when it is reverse-polarized at a dimmer input or receiving point. And can be used for real purposes Industrial Electrically isolated closed-loop dimming control circuit for electronic ballasts for ballasts. Dimmable electronic last according to this invention. Fluorescent lamp current regulation is used by feedback the lamp current through a high frequency transformer. And control current with an op-amp circuit that provides the output of the circuit Controlled as current or voltage through opto-type devices It can receive a dimmer command that is 1-10 volt direct control voltage or control resistance. External with a high value of 1 megohm or more Or if not continue The dimmer command provides the maximum dimmer voltage that the ballast can operate normally. The dimming control circuit based on this invention offers high user safety. Because it is independent from the high voltage of the ballast system and will not damage the ballast when it is reverse-polarized at the unloaded or dimmer input point. And can be used for real purposes Industrial

Claims (1)

1.Electrically independent closed-loop dimming control circuit For dimmer type electronic ballast Light can contain The straight-through rectifier and power factor improvement circuit (6) act as a sort. AC voltage from source to DC voltage with power factor approaching one. To supply the main circuit of the electronic ballast (7) that also serves to adjust the frequency for the resurfacing. Voltage or current delivered by the regulating circuit (10) to direct the fluorescent current (8) is characterized by The lighting control circuit has a high frequency current transformer (9) that serves to The current flowing into the fluorescent lamp (8) from the main circuit of the electronic ballast (7) to be fed to A flux control circuit (10) that controls the current of a closed-loop fluorescent lamp (8) and sends a control signal to an optical device (OPTO Device) (11) acting as a modulator. Voltage or current level for Define the working frequency of the electronic ballast main circuit (7).