JPS6262439B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to lighting of a discharge tube that is lit via a leakage transformer type ballast and to a non-contact starting device.

As a discharge lamp non-contact semiconductor starter (discharge tube non-contact semiconductor starter) to replace a conventional discharge lamp lighting device, for example, a glow starter, an AC power source 1 is equipped with a leakage transformer type ballast 2 as shown in FIG. A nonlinear capacitor 5 is connected to the filaments 4a and 4b of the discharge tube 3 through a diode 6 and a two-terminal silicon symmetrical switch (hereinafter abbreviated as SSS) 7. It has been proposed to connect a series circuit of This has the drawback of generating radio noise and noise due to vibration of the nonlinear capacitor 5. To prevent this drawback, SSS8 is connected in series with the nonlinear capacitor 5 of the circuit shown in FIG. 1, as shown in FIG. 2. However, such products are expensive.
Since two SSS7 and 8 were used, the disadvantage was that the cost was high.

The present invention relates to a discharge lamp lighting device that eliminates the above-mentioned drawbacks.

A third embodiment of the discharge lamp lighting device of the present invention will be described below.
This will be explained with figures.

In the discharge lamp lighting device of the present invention, as shown in FIG.
The preheating filaments 14a, 14 of the discharge tube 13 are connected to the secondary side of the leakage transformer type ballast 12 via
b, and the leakage transformer type ballast 12
A nonlinear capacitor 16 is connected to the leakage coil 15 of
are connected in parallel, and a diode 17 and a two-terminal silicon symmetrical switch (hereinafter referred to as SSS) are connected to the preheating filaments 14a and 14b of the discharge tube 13.
It is constructed by connecting 18 series circuits.

Next, the operating state of the discharge lamp lighting device of the present invention configured as described above will be explained.

First, a voltage is applied in the forward direction of the diode 17 from the AC power supply 11 via the leakage transformer type ballast 12, and when the voltage value exceeds the breakover voltage value of the SSS 18, the SSS 18 becomes conductive, and the preheating current increases as described above. Flows from the secondary coil of the leakage transformer type ballast 12 to the preheating filament 14a of the discharge tube 13, the SSS 18, the diode 17, and the preheating filament 14b of the discharge tube 13 in this order, and both filaments 14a, 14 of the discharge tube 13 flow in this order.
Preheat b. This preheating current continues to flow even after the polarity of the power supply voltage is reversed, but after the polarity of the power supply voltage is reversed, the nonlinear capacitor 16 is charged in the direction of arrow a in FIG. 3. When the preheating current has finished flowing, the power supply voltage is in the opposite direction of the diode 17 and is at a voltage just before the peak value, so the nonlinear capacitor 16 is connected to both ends of the leakage coil 15 of the leakage transformer type ballast 12. When a voltage (set higher than the saturation voltage of the nonlinear capacitor 16) is suddenly applied and rapidly charged in the direction opposite to the direction of arrow a, it becomes saturated and the current stops, causing leakage in the leakage transformer type ballast 12. A high pulse voltage with a steep rise is induced in the coil 15, and the pulse voltage is applied to the preheating filaments 14a and 14b at both ends of the discharge tube 13. As the above operation is repeated, the filaments 14a, 1 of the discharge tube 13
4b is sufficiently preheated and finally starts discharging and transitions to lighting. In this case, the breakover voltage of the SSS is set higher than the lighting voltage of the discharge tube 13, so it does not operate after lighting, and the nonlinear capacitor 16 is charged every half cycle of the power supply frequency depending on its saturation voltage. Although a voltage higher than the saturation voltage is applied to the leakage transformer type ballast 1
Since the lamp current (discharge tube 13 current) always flows through the leakage coil 15 of No. 2, a pulse voltage is not induced, and a stable lighting state without pulse noise is maintained.

4 to 7 show the configuration of other embodiments of the discharge lamp lighting device of the present invention, and FIG. 4 is similar to that of FIG. 3.
A thyristor 19 is used instead of the SSS 18, and in FIG. 4, 20 is a Zener diode, 21 and 22 are resistors, and the Zener diode 20 and resistors 21 and 22 constitute the gate circuit of the thyristor 19. , and Fig. 5 shows the case where the discharge tube 13 is applied to a mercury lamp or a sodium lamp that does not require preheating.
The figure shows that the voltage across the leakage coil 15 of the leakage transformer type ballast 12 is the nonlinear capacitor 1.
This is a case where the saturation voltage of the nonlinear capacitor 16 is obtained by connecting the intermediate tap 23 when the saturation voltage of the nonlinear capacitor 16 is lower than the saturation voltage of the seventh capacitor.
The figure shows a diode 24, a thyristor 25, and resistors 26 and 27 forming a gate circuit for the thyristor 25 added to the circuit shown in FIG. This is the case when the configuration is configured so that it can be used.

Since the discharge lamp lighting device of the present invention has the above-described configuration, by connecting a nonlinear capacitor in parallel to the leakage coil of the leakage transformer type ballast, a stable discharge lamp without pulse noise can be achieved with a small number of parts. can be realized, which has an extremely large advantage in terms of the manufacturing process and the cost of the lighting device, and moreover, the discharge lamp lighting device of the present invention
If applied to a 40W ballast, a 100V voltage is induced in the leakage coil of a leakage transformer type ballast, so the nonlinear capacitor that is used for 100V and below 30W can be used as is.
You can add a conventional 200V compatible circuit, or
It has the advantage that it is not necessary to use a dedicated capacitor.

[Brief explanation of the drawing]

1 and 2 are circuit diagrams of a conventional discharge lamp lighting device, FIG. 3 is a circuit diagram showing an embodiment of the discharge lamp lighting device of the present invention, and FIGS. 4 to 7 are circuit diagrams of a conventional discharge lamp lighting device. FIG. 3 is a circuit diagram showing another embodiment of the electric lamp lighting device. In the drawing, 1 and 11 are AC power supplies, 2 and 12 are leakage transformer type ballasts, 3 and 13 are discharge tubes, 1
4a and 14b are preheating filaments, and 16 is a nonlinear capacitor.

Claims (1)

[Claims] 1. In a discharge lamp lighting device in which a discharge tube is connected to an AC power source via a leakage transformer type ballast, a nonlinear capacitor is connected in parallel to the leakage coil of the leakage transformer type ballast. A discharge lamp lighting device characterized by: 2. Claim 1, characterized in that a semiconductor switch is connected to the non-power side of a discharge tube having a preheating filament that also serves as a discharge pole in series with the preheating filament and in parallel with the discharge tube. Discharge lamp lighting device as described in .