Isolated-type multiple electronic ballast combined dimming execution circuit

Abstract

The invention provides an isolated-type multiple electronic ballast combined dimming execution circuit which comprises a PWM light dimmer. Each electronic ballast is respectively provided with a dimming execution modular circuit which comprises a signal isolation circuit, a signal restoration circuit and a signal conversion circuit. An input port of the signal isolation circuit of each diming execution modular circuit is connected to a PWM signal bus of the PWM light dimmer. An output port of the signal conversion circuit of each diming execution modular circuit is respectively connected with each electronic ballast. The signal isolation circuit is used for transmitting a PWM signal and isolating the electronic ballasts. The signal restoration circuit is used for restoration of a distorted PWM signal during the transmission process. The signal conversion circuit is used for converting the restored PWM signal to a dimming signal to be provided to the electronic ballasts. Through modularization and bus connection form, the PWM signal is connected to a control system so as to realize one-to-many electronic ballast dimming control.

Description

technical field [0001] The invention relates to a combined dimming executive circuit between electronic ballasts of multiple high-pressure gas discharge lamps. Background technique [0002] High-pressure gas discharge lamps are favored in green lighting projects due to their advantages of high luminous efficiency, long life and good color rendering, and the matching electronic ballasts have also become a research hotspot. Dimming is often required in electronic ballasts. In this way, people can adjust the brightness of the lamp according to the actual lighting effect, so as to achieve the effect of energy saving. The dimming control of some electronic ballasts, the circuit and the control circuit are designed on the same circuit board, which is difficult to maintain. Once one of the components is broken, the entire system needs to be checked. Moreover, the existing equipment all adopt their own control systems, which cannot achieve one-to-many unified control. Mainly beca...

AI Technical Summary

Problems solved by technology

The dimming control of some electronic ballasts, the circuit and the control circuit are designed on the same circuit board, which is difficult to maintain. Once one of the components is broken, the entire system needs to be checked.

Moreover, the existing equipment all adopt their own control systems, and it is impossible to achieve one-to-many unified control

Mainly because most of the current electronic ballasts use non-isolated circuits. When using one dimmer to control multiple electronic ballasts, if the communication interface is not isolated from the main circuit, each communication interface is connected to the Together, the operating points of different potentials may be forcibly connected, which will cause damage to the electronic ballast

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