| 摘要 |
PURPOSE:To obtain a small and light weight power source unit which reduces variations in the radiation of ultraviolet rays regardless of changes in the voltage while increasing the amount of ultraviolet rays, by converting a commercial AC power source to a higher frequency to be supplied to a discharge lamp lighting circuit and an incandescent lamp lighting circuit. CONSTITUTION:With a circuit 3, a commercial AC 1 undergoes a full-wave rectification 10 to be smoothed 11 and applied to a primary winding 15a of a transformer 15 through transistors 13 and 14 PP connected to a constant current inductance 12. A base is wound with a feedback winding 15c and a high frequency voltage is generated in a secondary winding to light a discharge lamp 5. Here, the amount of ultraviolet rays increases by about 8% while the rate of change in the radiation is reduced to one half with respect to the variation in the source voltage. With a circuit 4, a base current flows through resistances 19 and 20 by a DC voltage smoothed and an AC signal is applied between the base and emitter of a transistor 21 synchronizing the frequency generated in a control winding 22 of the transformer 15 to light an incandescent lamp 6 synchronizing the discharge lamp 5. This eliminates the need for a transformer with a commercial frequency, thereby enabling a smaller size and a lighter weight. |
