JPS601757B2 - High frequency discharge lamp lighting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a high-frequency discharge lamp lighting device that improves starting performance during dimming switching through a rational circuit arrangement.

In general, when a discharge lamp is lit at high frequency, it is easy to perform dimming and lighting, so it is adopted as a means of improving additional functions of lighting equipment, but it is necessary to fully consider the startability of the discharge lamp when switching dimming.

That is, since a dimming means is inserted into the filament heat circuit when switching the light, there is a drawback that sufficient filament heat cannot be obtained. In order to solve this problem, the discharge lamp was first turned on at full brightness and then switched to dimming, but this had the disadvantage of complicating the structure. The present invention solves the above-mentioned drawbacks and uses a rational circuit arrangement to make the startability when switching dimming completely equal to that when switching to full-light switching.One embodiment of the present invention will be described below with reference to the drawings. explain.

The configuration on which the present invention is based is that an AC power supply 1 is supplied to a preheating start type discharge lamp 3 via a high frequency oscillation unit 2 (which oscillates at about 20 KHz), and a transfer is made between the high frequency oscillation unit 2 and the discharge lamp 3. A device into which a light control means 4 is inserted, which has a dimming control section 5 that controls the light control means 4, and which controls the preheating path of the filaments 3a and 3b of the discharge lamp 3 into which the separately mentioned light control means 4 is inserted. It is equipped with a heat control section 6 and a timer 7 for controlling the preheating control section 6.

The dimming means 4 is, for example, a known saturable reactor, and in this case, the dimming control section 5 corresponds to a DC power source.

Next, the main configuration of the present invention is an AC power supply 1 and a high frequency oscillation section 2.
, a switch 8 is inserted between the dimming controller 5 and the timer 7, and a switch means 9 is inserted between the AC power supply 1 and the dimming controller 5, and the switch 8 switches the discharge lamp 3 to full light. When lighting the discharge lamp 3, power is supplied to the high frequency oscillator 5 and the timer 7, and when the discharge lamp 3 is dimmed, power is supplied to the high frequency oscillator 2 and the timer 7, and after the set time of the timer 7 has elapsed (approximately 1 second). This timer 7 causes the switch means 9 to become non-conductive.

The switch 8 is an example of a rotary switch, and its rotary piece 8a is set to switch in three stages, that is, full light - dimming - off. The dotted line indicates full light operation, and the solid line indicates dimming off. Corresponds to fusuma. The switch means 9 is, for example, Phototriack (trade name), which is optically coupled and conductive by a signal from the timer 7 before the set time of the timer 7 has elapsed, and after the set time of the timer 5 has elapsed, the optical coupling is no longer performed. It leads to discontinuity. Next, the operation of the above configuration will be explained.

When the rotating piece 8a is on the dotted line, that is, when all lights are switched, power is also supplied to the dimming control unit 5, the impedance of the dimming means 4 becomes almost 0, and the subheating control unit 6 is turned on within the set time of the timer 7. The filament 3a is generated by the high frequency oscillator 2 through
, 3b are heated. After the set time of the timer 7 has elapsed, the child heat control section 6 becomes non-conductive and the filament 3a
, b is applied from the high frequency oscillator 2, and the discharge lamp 3 is fully lit. When the rotating twill 8a is on the solid line, that is, when switching the dimming, power is supplied to the dimming control unit 5 via the suitable switch means 9 within the set time of the timer 7, and the impedance of the dimming means 4 is almost the same. 0, and the child heating of the filaments 3a and 3b is performed exactly equally in the case of full light.

Then, after the set time of the timer 7 has elapsed, the child heat control section 6 becomes non-conductive, and at the same time, the switch means 9 also becomes non-conductive, and the impedance of the sightseeing means 4 is increased by the dimming control section 5, and the discharge lamp 3 is turned off. The light is dimmed through this impedance. ．． 0 As described above, the present invention makes it possible to make the filament child heat at the time of light switching completely equal to that at the time of full light switching,
It has the characteristics of good startability and a rational circuit layout.

[Brief explanation of drawings]

The drawing is a block diagram based on an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... AC power supply, 2... High frequency oscillation part, 3... Discharge lamp, 3a, 3b... Filament, 4... Lighting means,
5... Dimming control section, 6... Preheating control section, 7... Timer 0-1, 8... Switch, 9... Switching means.

Claims (1)

[Claims] 1. A dimming control unit for supplying AC power to a preheating start type discharge lamp via a high-frequency oscillation unit, interposing a dimming means between the high-frequency oscillation unit and the discharge lamp, and controlling the dimming means. and a timer that controls a preheating control section that controls a filament preheating path of the discharge lamp in which the dimming means is inserted, wherein the AC power source, the high frequency oscillation section, the dimming control section, and A switch is inserted between the timer, and a switch means is inserted between the AC power source and the dimming control section, and when the discharge lamp is turned on at full power, the switch is configured to control the high-frequency oscillation section and the dimming control section. Power is supplied to the dimming control unit and the timer, and when the discharge lamp is dimmed and lit, power is supplied to the high frequency oscillation unit and the timer, and after the set time of the timer has elapsed, the timer disables the switching means. A high-frequency discharge lamp lighting device characterized by leading to conduction.