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[2013-03-07]
The Digital high-pressure sodium lamp electronic ballasts, constant power control of the sodium lamp, the main program flow using event-driven, event-driven from the interrupt service routine; drive an event in the interrupt service routine, each corresponding to the main programthe task of the event is executed, the MPU control unit via this event-driven manner, and controls the respective circuits in the circuit module....
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[2013-03-07]
The digital control to achieve soft switching PWM technology and Automotive HID lamp ballasts , including power management module, flyback DC-DC converter, the main core module, the current auxiliary network, DC - AC converter, step-up circuit; characterized bymain core module including microcontroller, respectively connected to the input of microcontroller I / O interface, and the A / D converter module and connected to the microcontroller output of digital PWM module...
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[2013-03-07]
Fluorescent ballasts use of core openings, additional magnetic flux leakage tooth core box and placed the core to form a magnetic gap between which a period of saturation of the magnetic circuit and the magnetic flux leakage branch to improve ballastthe purpose of the working state....
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[2013-03-06]
The tunnel lighting fixtures,It consists of a glass mask, the cover, the porcelain lamp holders,the main reflector, the high pressure sodium ballasts, the lamp, and vice reflector. The grounds of which the main reflector composed of multiple strips plane stitching folded surface subreflector circle involute surfaces, the dimmable electronic ballasts,...
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[2013-03-06]
The efficient dimmable electronic ballasts, adjusted by the rectifier filter circuit, high frequency inverter circuit, power circuit and filament preheating circuit. Ballast power factor regulator capable of producing high power factor and low harmonic rate. The present invention also given an electronic ballast power regulation circuit, low power switch tube fever, so dimmable electronic ballasts commercialization....
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[2013-03-06]
Rapidly install the fluorescent fitting and its ballast. Including a fluorescent fixture and fluorescent ballasts, characterized in that the opening in the side of the light pipe bracket has a through hole in the through-hole is equipped with a ballast bracket disposed within the light pipe holder, said ballast Tropsch the frame is constituted by each side of a square guide groove, and a connecting plate connecting the rear end of the guide grooves of the two square, and each provided with a resilient positioning convex head at the inner side of the guide grooves of the two square uniformly disposed...
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[2013-03-05]
Electronic ballasts for lamps does not start protection. With a rectifier links, a RC network , a voltage divider , a delay trigger circuit and a thyristor switch. The protector directly or through damping capacitor and contains the master oscillator capacitor does not include the inductance of the main oscillation is detected branch sections for sampling voltage the delay capacitor charging, at least from thefluorescent ballasts LCR branch Dentsu light does not start trigger conduction in the state where a non-contact switch, will be detected branched sections approximate short-circuiting or the damping capacitance into branched sections is detected, forcing where slip damping current limiting to protect the components in the branch and main circuit where against long high-frequency or over-current damage, while the other branch is business as usual. The easy and flexible, safe and reliable....
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[2013-03-05]
Fluorescent ballasts by the ballast coil windings, relays, current limiting resistor and starter relay winding and starter series circuit with fluorescent tubes and relays normally closed contacts in series circuit in parallel,the parallel circuit of the ballast primary coil winding is connected to the power supply, the secondary coil winding and current limiting resistor in series, normally open relay contacts in series circuit with the primary coil windings and fluorescent series circuit in parallel. Generated in the secondary coil windings high voltage is applied to the tube ends, directly stimulate lamp strike and light-emitting, still lit the lamp filament has broken, so to extend the life of the lamp, and the magnetic ballast simple structure, reliable performance ....
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[2013-03-05]
Preheat electronic ballasts, the power supply circuit, the delay circuit and the preheating circuit and the switch circuit is constituted; wherein resonant capacitor across the lamp connected in parallel to a preheat start branch, the branch consists of a normally closed relay contacts and resistors and capacitors in series. Relay contacts which is equivalent to the lamp plus a jump bubble, it can overcome the shortcomings of the current electronic ballast, lamp and ballast work status improved, life has been extended....
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[2013-03-04]
Electronic ballasts resonant inverter circuit, comprising the EMI filter, the diode bridge, APFC control circuit, the inverter circuit, the parallel resonance circuit, the lamp load circuit, a phase compensation circuit, wherein: APFC power factor control circuit forcorrection, so that the input power factor of 0.98 or more, the input current harmonics up to standard; inverter circuit to provide energy for the parallel resonant circuit; parallel resonant circuit for generating a high voltage higher than the breakdown voltage of the fluorescent tube; lamp load circuit waslimiting negative resistance characteristics of the fluorescent tube....
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