LED Dimming Light Advantages

LED Dimming Light Advantages 

A) Adjust the power supply voltage of the half-bridge inverter to achieve dimming. 

B) The pulse duty cycle (about 0.5) is fixed, so that the half-bridge inverter works in a soft-switching state, and can achieve wide dimming range dimming under the continuous working condition of the ballast inductor current (this can also make Simplified switch control circuit). 

C) Since the switching frequency is fixed, the control circuit design can be simplified for a given fluorescent lamp model. 

D) It can achieve smooth and almost linear lamp power adjustment control characteristics. 

E) A low-power solution can be obtained. The power supply voltage of the half-bridge inverter can be selected very low (for example, 5%-100% of the dimming range corresponds to 30-120v), so that low-voltage capacitors and low voltage withstand values can be used Power MOSFET. 

F) In addition to the small pulse duty cycle, when the lamp circuit fails, the discontinuous current working state of the power switch tube will also appear. When the lamp load has an open circuit failure, the inductor current will flow through the resonant voltage. Because the capacitance of this capacitor is smaller, the impedance is larger, and a higher voltage is generated on this resonant capacitor. Unless the two power switch tubes have an absorption protection circuit, the power switch tubes will bear great voltage stress at this time.