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[2013-03-17]
Fluorescent lamp electronic ballast, the protection device by a high-voltage pulse filter, high-voltage protection circuit to prevent the continuous starter circuit can prevent normal starter due to the AC grid instantaneous pressure pulse or fluorescent light can not cause the damage to the electronic ballast. Protection device is simple, cost increase much, can greatly improve the reliability of electronic ballasts....
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[2013-03-17]
The fluorescent electronic ballast interrupter protection circuitry, including electronic ballasts, and connected with the electronic ballast fluorescent lamps, a fluorescent interrupter protection circuit is also connected between the electronic ballast and fluorescent. Fluorescent interrupter said protection circuit includes a delay closing the circuit and filament interrupter circuit, delay closing the output terminal of the circuit with the electronic ballast is connected and through the filament interrupter circuit and lamp connection....
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[2013-03-17]
Electronic ballasts with overload protection,Power supply section in series with a positive temperature system thermistor, when the load over the load, caused by network voltage is too high and other reasons the electronic ballast working current increases, overload operation, positive temperature coefficient thermistor temperature rises, the resistance increases, circuit breaker protection. the hps ballasts protective reliable, simple structure, low cost, easy to universal application....
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[2013-03-16]
high-power (≥ 250W) street lights: high pressure sodium lights are efficient, considering the high pressure sodium ballasts loss, luminaire efficiency and optical channel utilization factors, the overall efficiency of 0.55 meter, sodium lamp light efficiency is approximately 70 ~ 751m / W; LED street light efficiency in the United States, approximately 621m / W, the best domestic enterprises has reached 56 to 581m / W. Therefore, the high-power street lamps, LED than sodium lamp energy efficiency lower....
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[2013-03-16]
Thyristor converter shift phase ignitor is constituted by a basic element transformer or inductor, an electrolytic capacitor and a variable resistor so that the thyristor conduction angle corresponding change by changing the magnitude and phase of the triac gate current, reaching shiftthe purpose of the phase: simple structure; wide adjustment range; ignitor power; temperature drift; easy to introduce, or a combination of control signals constitute the open-loop control or closed loop regulation system; suppression instantaneous breakdown voltage thyristor; without auxiliarypower; low cost; conserve power, suitable for high pressure sodium ballasts and metal halide ballasts....
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[2013-03-16]
Electronic ballasts of fluorescent lamps with constant current regulator, an increase in the power input and the rectifier between varistor R7, capacitors C6, C7, C8, and common mode choke ring B2 consisting of anti-interference and harmonic suppression circuit, a total ofmode choke ring B2 two coils, equal to the number of turns, the wound in the opposite direction. BG1, BG2 the base and emitter between the connected across a capacitor C9, C10, equal capacity in the power transistor. The starter capacitor C5 and then the a thermistor R8. The advantages: reducing pollution on the grid, anti-interference, stable performance, long lamp life....
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[2013-03-16]
Resistant current impact of energy-saving lamps dedicated ultra-small high-voltage capacitors,And energy-saving lamps special ultra small high-pressure metal-film capacitors constituted by the housing, a capacitor core and lead; wherein said capacitor core by three string type media and the electrode; metallized film capacitor core the exposed electrodes formed wavy edge and Layer Media four plates interleaved the superimposed structure trebles media and electrodes. Sprayed gold layer wavy edge of the electrode is formed by spray technics, not only the metallized film and coated with gold layer firmly attached, and the impact of the current resistance. The higher voltage resistance, capacitance stability, more secure and reliable performance, small size....
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[2013-03-15]
Series resonant the electronic ballasts filament preheating control circuit, the ballast inverter drive output terminal connected to the series resonant circuit L1, C1, L1, C1 between series with a filament transformer, the secondary winding of the filament transformer and lampfilament pin is connected to a switching circuit in parallel, the primary coil of the filament transformer, the lamp connected in parallel to the filament transformer primary coil connected in series between the resonance capacitor C1, and by grounding DC blocking capacitor C2, in the fluorescent lamp filament pre-end, lamp normal working after the primary winding of the filament transformer is switching circuit bypass, the filament power is no longer provided. The switch of the lamp, long life, low power loss, high energy efficiency....
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[2013-03-15]
The electronic ballasts with IC off function,The MOS gate driver IC (MGD), drives a pair of MOS gate controlled power semiconductor device used in, for example, the half-bridge circuit used in the electronic ballast circuit in the power supply circuit to drive a resonant load or a driving gas discharge lamps. The gate drive circuit includes a protection circuit to protect the components in the drive circuit when the lamp failure or removal by prohibiting the output of the two drives without being damaged. When the lights are back in, the gate drive circuit without the power switch of the lamp to restart the lamp drive circuit....
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[2013-03-15]
Random noise, with sawtooth composite FM Metal Halide Ballasts,High-intensity discharge HID metal halide lamp energy saving electric light source technology, specifically a random noise, with sawtooth composite FM metal halide ballast. With electromagnetic interference suppression filter EMI main power rectifier circuits, active power factor pre-adjustment circuit APFC DC power supply and control circuit, self-oscillating pulse generator, the drive of the half-bridge or full-bridge, half-bridge or full-bridge switches inverse modulation of the starting circuit, characterized in also has a random noise generator....
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