Electric lamp and discharge devices: systems – Pulsating or a.c. supply – Periodic-type current and/or voltage regulator in the supply...
Reexamination Certificate
1999-07-29
2001-05-08
Vu, David (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
Periodic-type current and/or voltage regulator in the supply...
C315S2090SC, C315S276000
Reexamination Certificate
active
06229268
ABSTRACT:
The present invention relates to a device for supplying power to at least one bromine tungsten filament lamp comprising an electronic transformer composed at least of a frequency converter for generating a high-frequency output and a high-frequency transformer.
BACKGROUND OF THE INVENTION
A bromine tungsten filament lamp is a large kind of light source for modem lighting, and most of service voltages of bromine tungsten filament lamps are low voltage of 12 V. Therefore, when 120V/50 Hz or 220V/50 Hz power supply is adopted, transformer must be used. At present there are two kinds of transformers for bromine tungsten filament lamps. One is iron-core transformer and the other electronic transformer. The advantage of the former is simple circuit, but the disadvantages are high consumption, heavy weight and large size. For higher power, the disadvantages are more obvious. The advantages of the latter are low consumption, small size and light weight. Therefore, the electronic transformer of bromine tungsten filament lamp has been extensively used. The principle of frequency conversion and voltage transformation is applied to electronic transformer, which is composed of rectification filter circuit, frequency conversion circuit and high-frequency transformer. The frequency of electronic transformer is 20-60 Khz. The development of modern lighting requires multi-region directional lighting, so one electronic transformer of bromine tungsten filament lamp is required to have the function of being used by several bromine tungsten filament lamps. Meanwhile a certain length of output feeder line must be used. But because the working frequency of bromine tungsten filament lamp is rather high, the transmission impedance of output feeder line itself is low. The impedance is close to that of bromine tungsten filament lamp. Besides, in installation, the length of feeder line and distance between lines are not fixed by the user and the number of bromine tungsten filament lamp not fixed either. Therefore, the serious mismatched output will occur. Practice shows that when the output is mismatched, the output power is lowered and the luminance lowered too. In the most serious case, the frequency conversion switching transistor of the frequency converter will be burnt. If the number of installed lamps is rather small, the load is less than nominal power and the lamps will be overpowered, their life shortened and the switching transistor burnt. On account of the above causes, the current electronic transformer of bromine tungsten filament lamp sold in the market cannot be connected with output feeder line.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a device for eliminating the unfavourable effect due to feeder line connection to the high-frequency transformer of the electronic transformer for supplying power to at least one bromine tungsten filament lamp.
In a device for supplying power to at least one bromine tungsten filament lamp comprising an electronic transformer composed at least of a frequency converter and a high-frequency transformer this object and other objects are attained according to the invention by providing an alternating current to pulsating direct current converter connected in between the output of the high-frequency transformer and the feeder line of the bromine tungsten filament lamp. The alternating current to pulsating current converter is connected by its input terminal externally to the output of the high-frequency output transformer of the electronic transformer and by its output terminal to the load for supplying a pulsating direct current. The eliminator device according to the present invention makes it possible to overcome the mismatching of output caused by output feeder line.
In an embodiment of the invention the alternating current—direct current converter is a half-wave, full-wave or bridge type alternating current—pulsating current converter.
After the power supply of high frequency output passes through this eliminator device for unfavourable effects of feeder line, the wave form of current is transformed, the effect of impedance change of feeder line eliminated and the matching and stability of output is achieved. The electronic transformer operates normally. Frequency conversion switching transistor is not easy to burn.
REFERENCES:
patent: 4360783 (1982-11-01), Nagasawa et al.
patent: 4423478 (1983-12-01), Bullock et al.
patent: 4906901 (1990-03-01), Carroll
patent: 5128593 (1992-07-01), Gilbert
patent: 5343122 (1994-08-01), Sugimori et al.
patent: 5537008 (1996-07-01), Matsuda et al.
Dennison, Scheiner Schultz & Wakeman
Mass Technology (H.K.) Ltd.
Vu David
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