JPS6324639Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dimmer device for sequentially starting two discharge lamps in series.

BACKGROUND ART Conventionally, this type of discharge lamp dimmer device has a configuration as shown in FIG. In the same figure,
Reference numeral 1 denotes an AC power supply, and 2 a dimming signal generation unit, which includes triaxes 3 and 4, a trigger element 5, a capacitor 6, a resistor 7, a variable resistor 8, etc., and generates a predetermined dimming signal by adjusting the variable resistor 8. Occur. 9 and 10 are discharge lamps, which are connected in series with each other. 11 is a ballast, which includes a primary winding 12 and a secondary winding 13.
A ballast main body 14 having a phase control section 15, a pulse voltage generation section 16, a preheating transformer 17, a starting compensation capacitor 18, etc. are incorporated. The phase control section 15 controls the phase of the power supply voltage according to the dimming signal from the dimming signal generating section 2, and includes a resistor 19.
and a triax 20, etc. The pulse voltage generator 16 includes a coil 21, a capacitor 22, and a resistor 2.
Consists of 3rd prize.

According to the above configuration, when the triax 20 is turned on, the pulse voltage generated in the pulse voltage generator 16 is superimposed on the secondary voltage of the ballast 11, one of the discharge lamps 9 is slightly discharged through the starting compensation capacitor 18, and then Then, the other discharge lamp 10 is lit and started. However, in this case, when the phase angle becomes large during dimming, the energy of this pulse energy alone is small, and a considerably high voltage pulse is required, which increases the size of the ballast 11 and requires high insulation performance.

In view of the above-mentioned problems, the present invention enables discharge lamps to be lit with relatively low-voltage pulses even when the phase angle becomes large during dimming, makes it possible to downsize the ballast, and requires only low insulation performance. The feature is that one of the stabilizers 11 is connected to both ends of the AC power supply 1.
A series circuit of the secondary winding 12 and a phase control unit 15 that controls the phase of the power supply voltage applied to the primary winding 12 is connected, and this series circuit is connected to the two parts of the ballast 11.
A pulse voltage generation unit which connects a series circuit of the secondary winding 13 and a pair of discharge lamps 9 and 10 in parallel, and charges the capacitor 22 during phase control of the phase control unit 15 to generate a pulse voltage in the secondary winding 13. 16 connected in parallel to the primary winding 12, the phase control unit 15 has first and second phase controls that are turned on and off alternately every half cycle of the power supply voltage. elements 24 and 25, so that current flows in the opposite direction to the primary winding 12 and the pulse voltage generator 16 every half cycle of the power supply voltage by turning on and off the first and second phase control elements 24 and 25. , one ends of the first and second phase control elements 24 and 25 are connected to each DC side terminal of the diode bridge 26, and one end of the primary winding 12 and the pulse voltage generator 16 are connected to each AC side terminal, respectively. One end of the pulse voltage generator 16 is started so that the capacitor voltage of the pulse voltage generator 16 and the power supply voltage are superimposed and applied to one discharge lamp 10 when the first and second phase control elements 24 and 25 are off. A pair of discharge lamps 9, 1 via a compensation capacitor 18
It is at the point connected to the connection part of 0.

The following will explain the illustrated embodiment of the present invention. In FIG.
Separated from the circuit on the side of the next winding 12, the phase control section 15 includes a first phase control element 24 and a second phase control element 25, which are configured by a triac and are connected in antiparallel to each other. These phase control elements 2
4 and 25 are connected to the primary winding 12 side circuit and the pulse voltage generator 16 through forward diodes 27, 28, 29, and 30 constituting a diode bridge 26, and are connected to the pulse voltage generator 16 through diodes 31 and 32. It is designed to be gate-controlled by a dimming signal from a dimming signal generator 2. The pulse voltage generator 16 is connected to the connection between the discharge lamps 9 and 10 via a starting compensation capacitor 18. Further, a resistor 33 is connected in parallel to the capacitor 22.

According to the configuration of the above embodiment, when a power supply voltage is applied between the power supply terminals, the trigger element 5, the triac 3, and the triac 4 are activated according to the adjustment of the variable resistor 8.
are turned on sequentially, and the dimming signal generating section 2 generates a dimming signal every half cycle of the power supply voltage. Therefore, in the phase control section 15, the first and second phase control elements 2
4 and 25 are turned on and off alternately in half waves at a predetermined dimming angle. First or second phase control element 24,2
5 turns on the pulse voltage generator 16 from the power supply 1.
A current flows to charge the capacitor 22, and this charging current generates a pulse voltage in the coil 21.
This is superimposed on the secondary voltage of the ballast 11 and the discharge lamp 9
, the discharge lamp 9 starts reliably and quickly. And the first and second phase control elements 24, 2
When one of the discharge lamps 1 is turned off, the capacitor voltage of the pulse voltage generator 16 and the power supply voltage are superimposed and one discharge lamp 1 is turned off.
0, a current flows through the discharge lamp 10 via the resistor 23 and the starting compensation capacitor 18, and the discharge lamp 10 slightly discharges. Therefore, even if the phase angle becomes large during dimming, the discharge lamps 9, 10 can be illuminated with relatively low pulses.
can be lit reliably, the ballast can be made smaller, and high insulation performance is not required.

FIG. 3 shows another embodiment, in which an oscillation transformer 34 is provided in place of the coil 21 of the previous embodiment, and the other configurations are the same as those of the previous embodiment, and the same effects are achieved.

According to the present invention, when the first phase control element and the second phase control element are off, the capacitor voltage of the pulse voltage generator and the power supply voltage are superimposed and applied to one of the discharge lamps, causing a slight discharge. Therefore, when the first phase control element or the second phase control element is on, even if the phase angle becomes large during dimming, the discharge lamp can be lit with a relatively low voltage pulse, and therefore the ballast can be turned on. It can be made smaller and also eliminates the need for high insulation performance.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional example, FIG. 2 is a circuit diagram showing one embodiment of the present invention, and FIG. 3 is a circuit diagram showing another embodiment. 1... AC power supply, 9, 10... Discharge lamp, 11...
... Ballast, 12 ... Primary winding, 13 ... Secondary winding, 15 ... Phase control section, 16 ... Pulse voltage generation section, 18 ... Starting compensation capacitor, 24 ... First phase control element , 25... second phase control element, 2
7, 28, 29, 30...diode.

Claims (1)

[Utility Model Claim] A primary winding 1 of a ballast 11 is connected to both ends of an AC power source 1.
A series circuit of the primary winding 12 and a phase control unit 15 for controlling the phase of the power supply voltage applied to the primary winding 12 is connected, and the secondary winding 1 of the ballast 11 is connected to this series circuit.
In a sequential start two-lamp series lighting type discharge lamp dimmer, a series circuit of a primary winding 12 and a pair of discharge lamps 9, 10 are connected in parallel, and a pulse voltage generating section 16 is connected in parallel to the primary winding 12 for generating a pulse voltage in a secondary winding 13 by charging a capacitor 22 during phase control by a phase control section 15, The phase control section 15 includes first and second phase control elements 24, 25 which are alternately turned on and off every half cycle of the power supply voltage. One end of the first and second phase control elements 24, 25 is connected to each DC side terminal of a diode bridge 26, and one end of the primary winding 12 and the pulse voltage generating section 16 is connected to each AC side terminal of the diode bridge 26 so that a current in the opposite direction flows through the primary winding 12 and the pulse voltage generating section 16 every half cycle of the power supply voltage by turning on and off the first and second phase control elements 24, 25. One end of the pulse voltage generating section 16 is connected to the pair of discharge lamps 9, 10 via a starting compensation capacitor 18 so that the capacitor voltage of the pulse voltage generating section 16 and the power supply voltage are superimposed and applied to one of the discharge lamps 10 when the first and second phase control elements 24, 25 are turned off.
1. A sequential start two-lamp series lighting discharge lamp dimmer, comprising: