A three-way dimming CFL ballast operates at a single high bus voltage while varying switching frequency to control lamp current. The ballast accepts three different light level input switch command positions and an off position to provide three different light output levels. A closed loop current ...
Transistors, diodes, and collection of capacitors and inductors are placed into the ballast design to first rectify the AC power and create a follower resonant inverter circuit that generates the high-frequency, high-voltage power used to fire the lamp. Within this electronic ballast, one of the...
This approach works well because CFL tubes have high impedances when they are off and low impedance when they are running. The tube voltage is typically 150V p-p.*Figure 1: A CFL ballast drives a long string of LEDs.*By putting several LEDs in series and connecting them to a bridge ...
An integrated bootstrap section, eliminating the normally required bootstrap diode and the zener clamping on Vs, makes the L6574 well suited for low cost applications where few additional components are needed to build a high performance ballast. 所有功能 HIGH ACCURACY CURRENT...
• Running frequency 44.5 kHz; start frequency 111 kHz • Preheat: 0.7 s • 1.5 lamp current boost, set for 50 s Protective functions: • Coil saturation set to: –UBA20262: 2.3 A at 230 V –UBA20261: 2.8 A for 120 V ...
• Running frequency 44.5 kHz; start frequency 111 kHz • Preheat: 0.7 s • 1.5 ? lamp current boost, set for 50 s UBA20261 (120 V): • Input voltage range: 120 V; 15 %; 60 Hz • Input power: 18 W at 120 V
Detection frequency range: 9kHz~300MHz (EMI-9KB) or 9kHz~30MHz (EMI-9KA). The Surge Generator (Lightning Surge Generator) SG61000-5 is according to IEC/EN61000-4-5. LISUN supplies up to 30KV/15KA output. EMI-9KB EMI Test Receiver SG61000-5 Surge Generator ESD61000-2 ESD ...
3. The resulting high frequency is applied to the tube. Working : The resulting high frequency excites the electrons inside the CFL which has mercury vapors and argon inside. It is also coated with phosphor. This gets illuminated when the electron falls on it. So larger the surface area it...
Stage-wise circuit analysis shows as the resonant filter action limits the lamp current and dominates the switching frequency of the ballast in steady-state working condition. The half bridge of the power active devices generates a rectangular voltage wavefo...
A three-way dimming CFL ballast operates at a single high bus voltage while varying switching frequency to control lamp current. The ballast accepts three different light