JPS6178099A - Discharge lamp lighting apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a discharge lamp lighting device for lighting a discharge lamp such as a fluorescent lamp.

[Background technology]

As shown in FIG. 3, a conventional discharge lamp lighting device connects a commercial power source 1 to a rectifying bridge 7, 2. The capacitor 4 converts the current to direct current, and the transistors 7.8. IIE anti-5.6. Reactor 3. Capacitor 9. The discharge lamp 12 is turned on by implementing a high frequency inverter device τI constituted by a leaky oscillation transformer 10 and the like.

11 is a pulse generator for starting the discharge lamp 12, which has a circuit configuration as shown in FIG. 4, and its operation is as follows.
The high frequency voltage generated in the output winding N] of
3, and charges the capacitor 1G through the resistor 14, illuminating it. When the direct fL1i voltage charged in the capacitor 16 reaches the breakover voltage VaV of the switching element (SSS) 15, the charge in the capacitor 16 is discharged via the primary t1 line of the pulse transformer 17.
A high voltage pulse necessary for starting the discharge lamp 12 is obtained in the secondary winding of the pulse transformer 17. In this case, the pulse $i[
The value is roughly determined by the breakover voltage VBO of the 5SSI5 and the step-up ratio of the primary and secondary windings of the pulse transformer 17, and the pulse repetition period is determined by the oscillation transformer l.
The voltage of output winding N3 of O and resistor 14 and capacitor 1
It is determined approximately by the charging time constant of 6 and the breakover voltage VBO of SSS15.

By adding such a pulse generator 11, when the commercial power is turned on, the high frequency inverter device I operates in a no-load state until the discharge lamp 12 starts, and the output winding N2. The induced voltage of N3 is high, so the pulse generator 11 continues to operate and generates high voltage pulses. When 12 or 1 discharge lamps are lit, 1 discharge lamp and 10 transformers are lit.
The voltage across the output winding N2 is reduced to the tube voltage of the discharge lamp 12, and the voltage across the output winding N3 is similarly reduced. In this foreshadowing, the pulse generator 11 will stop operating.
By selecting the breakover voltage VlIo of 5SS15, the generation of pulses can be stopped after the discharge lamp is turned on. Therefore, there is no need to worry about noise during lighting, and the lighting device's (ItM) characteristics are not affected.

In addition, the 31st! As a power source for the pulse generator 11 in 1, a DC 11!111 may be provided separately, but a detection device is required to stop the pulse after lighting the discharge lamp.

Figure 5 shows the discharge lamp 12 and oscillation transformer lO in Figure 3.
This is an example in which a parallel circuit of a reactor 18 and a switch 19 is inserted in series between the output winding 1IillN2 and a function is added to perform stepwise dimming by operating the switch 19. In this case, when the switch 19 is closed, the 3'8! The pulse generator 11 operates similarly to that of J, but switch 1
When the switch 9 is open, that is, in the stage dimming state, a back electromotive force is generated in the switch 18 due to a large voltage drop.
Even when the discharge lamp 12 is turned on, the output voltage of the oscillation transformer IO does not change much, and therefore it becomes difficult to stop the pulse generator 11. As a result, there are problems in that noise is generated due to pulse generation during dimming, the discharge lamp 12 flickers due to high-voltage pulses, and reliability is lowered due to deterioration of circuit components.

Note that the input terminals a and b of the pulse generator ll are connected to the discharge lamp 1.
The method of connecting both ends of 2 is also effective, but! It is necessary to set the operating voltage of the switching element (SSS) +5 shown in J4el high, making it expensive. Furthermore, the tube voltage of the discharge lamp 12 is higher during stage dimming than when the lamp is fully lit, but there is a possibility that the pulse cannot be stopped during stage dimming.

[Purpose of the invention]

The present invention provides a reactor for light emission between a discharge lamp and a high frequency inverter device to emit light, and has a pulse emitting nodule device: 6', which has a simple configuration and can be used even during dimming. Reliably stops the operation of the pulse generator,
It is an object of the present invention to provide a discharge lamp lighting system that can prevent lighting problems caused by pulse application.

[Disclosure of the invention]

The discharge lamp lighting device of the present invention includes a high-frequency impark device that is supplied with power from a DC power supply, a discharge lamp that is lit by being supplied with the output of the high-frequency inverter device, and a power supply path from the high-frequency impark device to the discharge lamp. When the voltage obtained by adding a part of the output voltage of the dimming reactor inserted therein, a part of the output voltage of the high frequency inverter device, and a part of the back electromotive voltage of the dimming reactor to the depolarization value exceeds a predetermined value. The present invention is characterized in that it is configured to include a pulse generator that generates a high-voltage pulse for starting and applies it between 148 of the discharge lamp.

In this way, high frequency inhaak! When the voltage obtained by adding a part of the JE's output voltage and a part of the reverse voltage of the dimming reactor to the depolarization value exceeds a predetermined value, the pulse generator emits a high voltage pulse to 1'I/L). As a result, sufficient pulse voltage is generated until the discharge lamp is lit, and after the discharge lamp is lit, the pulse can be stopped easily and reliably, whether the lamp is fully lit or dimmed, and the pulse voltage can be stopped easily and reliably during lighting. The noise can be prevented without impairing the reliability of the lighting device.

A first embodiment of this invention will be described based on FIG.

This discharge lamp lighting device connects a commercial power source 1 to a rectifier bridge 2.
Convert to DC with capacitor 4, transformer/stuff, 3. li
Anti-5, 6. Reactor 3. Capacitor 9. The discharge lamp 12 is turned on by driving a high frequency inverter device (2) constituted by a leakage type oscillation transformer 10 and the like. Further, a parallel circuit of a reactor 18 and a switch 19 is provided between the discharge lamp 12 and the output winding N2 of the oscillation transformer 10, and switching between full lighting and light lighting is performed by opening and closing the switch 19.

Further, 11 is a pulse generator for starting the discharge lamp 12, and li! as shown in FIG. It has an l-way configuration, and its operation will be explained below. That is, the output winding N3 of the oscillation transformer lO and the secondary Ji! of the reactor 18! The high frequency voltage applied differentially to the line N2' (added to the depolarization) is rectified by the diode 13, and the capacitor 16 is charged via the resistor 14. And capacitor 16
The DC voltage charged to is the breakover voltage vB of SSS l 5.

1! of capacitor 16 via the primary winding of pulse transformer +7. The load is discharged and the pulse transformer 17
A high voltage pulse necessary for starting the discharge lamp 12 is obtained in the secondary winding (same as described in the conventional example).

If the switch 19 is now closed, the primary winding [N+' of the reactor 18 is short-circuited, and therefore no induced voltage is generated in the secondary winding N2' of the reactor 18, and the input terminal a of the pulse generator #j device II , b, only the induced voltage of the output winding N, which is one of the secondary -tI wires of the oscillation transformer 10, is applied, and the operation is similar to that shown in Fig. 5, and after the discharge lamp is lit, the output The induced voltage in the winding N] is reduced and the pulse can be stopped.

On the other hand, when the switch 19 is opened, the tube current of the discharge lamp 12 is reduced by the actuator 18 and the light is dimmed step by step. Since no induced voltage is generated in the secondary winding N2' of the oscillation transformer 18, the same operation as shown in FIG. 5 is performed by the induced voltage in the oscillation transformer output winding N3, similar to when the switch 19 is closed.

When the discharge lamp 12 starts and dims and lights up, a back electromotive force is generated at both ends of the reactor 18 due to the tube current, and +77
An induced voltage proportional to the turns ratio also appears in the secondary winding N2' of No.8. This induced voltage VN2' and the output J1 of the oscillation transformer 1o when the discharge lamp 12 is dimmed and lit! Induced voltage V of line N3
If the number of turns of the reactor 18 is set so that N3 cancels vectorially, the input voltage of the pulse generation value 211 can be reduced, and therefore the operation of the pulse generator 11 can be stopped. Therefore, it is possible to solve the problem of noise during dimming lighting, and the discharge lamp 1
It is possible to prevent a decrease in reliability due to flickering or deterioration of circuit components.

A second embodiment of the invention will be explained based on FIG.
．． In this discharge lamp lighting device, a tap is provided in the output winding N2 in place of the output winding N3 of the oscillation transformer 10 in FIG. 1, and a tap is provided in place of the secondary winding N2' of the reactor I8. The tap voltage of the output @line N2 of the oscillation transformer 10 and the tap voltage of the actuator 18 are differentially applied (
The main operation is the same as that in FIG. 1.

This embodiment has the same effects as the first embodiment.

In addition, in the above embodiment, the number of discharge lamps 12 was one, but two
It may be a series circuit of three or more lights or a series-parallel circuit of three or more lights.
In addition to connecting the reactors 9 in parallel, it is also possible to perform this by switching the taps of the reactor 18 or the like.

C Effects of the Invention] The discharge lamp lighting device of the present invention has a dimming reactor inserted and connected in the power supply path from the high frequency inverter device to the discharge lamp, and also applies a high voltage pulse between both ends of the discharge lamp when starting the discharge lamp. When the magnetic pressure, which is the sum of part of the output voltage of the high-frequency inverter and part of the back electromotive force of the dimming reactor, exceeds a predetermined value, the pulse generator generates high-voltage pulses. As a result, sufficient pulse voltage is generated until the discharge lamp is lit, and after the discharge lamp is lit, whether it is fully lit or dimmed, the pulse can be stopped quickly and reliably. It is possible to prevent noise during lighting, and the reliability of the lighting device is not compromised.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a first embodiment of this invention, Figure 2 is a circuit diagram of a second embodiment of this invention, and Figure 3 is a conventional FI.
l,'; A circuit diagram of a four-lamp lighting device, FIG. 4 is a specific circuit diagram of the main part thereof, and FIG. 5 is a circuit diagram of another conventional discharge lamp lighting device. 1... High frequency inverter device, 10... Oscillation transformer, 12... Discharge lamp, 18... Reactor (for fil light), 19... Switch, +1... Pulse generator height j18y! I inverter'I! i! /I Iso I2 Figure 3! la Figure 4 Figure 5

Claims (2)

[Claims] (1) A high-frequency inverter device that is supplied with power from a DC power source, a discharge lamp that is lit by being supplied with the output of the high-frequency inverter device, and a dimming device that is inserted in the power supply path from the high-frequency inverter device to the discharge lamp. generating a high voltage pulse for starting when a voltage obtained by adding a part of the output voltage of the reactor and the high frequency inverter device and a part of the back electromotive voltage of the dimming reactor to a depolarizing value exceeds a predetermined value; A discharge lamp lighting device comprising: a pulse generator that applies a pulse between both ends of the discharge lamp. (2) The pulse generator includes a diode that rectifies the voltage added to the depolarization, and a capacitor that is charged through a resistor with the voltage rectified by the diode.
Claim No. 1, comprising: a voltage-responsive switching element that becomes conductive when the voltage of the capacitor exceeds a predetermined value; and a pulse transformer that supplies power from the capacitor to the primary winding through the voltage-responsive switching element. 1) The discharge lamp lighting device described in item 1).