JPS5854591A - Device for firing dimmer type discharge lamp - 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 The present invention relates to a lighting device for a fluorescent cape discharge lamp, and particularly to a lighting device for controlling the firing angle of an alternating current voltage.

This invention relates to a lighting device for a dimmable discharge lamp that emits light.

In order to save power by providing the necessary amount of light where it is needed without degrading the quality of illumination, the iI and iI light discharge nail discharge lamps are used.

Dimmable discharge lamps have excellent dimming characteristics that allow continuous dimming of the illumination.

Such a dimmable discharge lamp is equipped with a dimmer, which controls the firing angle of the alternating current voltage supplied to the discharge lamp.

Using a dimmer, the AC voltage firing angle can be adjusted continuously, but with ordinary commercially available discharge lamps, if the lamp is operated at a firing angle above a certain point, the discharge lamp will malfunction.

Or, it has the characteristic of shortening the lifespan of a discharge lamp.

This is because general commercial discharge lamps use a filament preheating method to ensure low-temperature starting and to maintain the cathode and maintain discharge even if the voltage between the electrodes of the discharge lamp decreases.

Therefore, in such a discharge lamp, it is necessary to use the dimmer in such a way that the firing angle control value does not exceed a certain value.

However, if the light is turned on under dimming control at an ignition angle exceeding the above-mentioned certain value due to careless operation of the dimmer, the discharge lamp may become black due to insufficient preheating of the discharge lamp's filament, resulting in the life of the discharge lamp. There was a fear that it would shorten the term.

An object of the present invention is to provide a dimmable discharge lamp lighting device that does not cause facing deterioration of the discharge lamp even if careless wide angle control is performed using a dimmer. be.

In this invention, in order to achieve the above object, AC St pressure with one firing angle controlled is supplied to the inverter via a rectifier,
Due to the oscillation operation of this inverter.

In a dimmable discharge lamp lighting device that dims and lights the discharge lamp by boosting the voltage whose firing angle has been controlled and supplying the voltage to the discharge lamp, the value of the firing angle is detected, and this value is detected. The S-image is provided with a phase determination circuit that stops the oscillation operation of the inverter when a certain value is exceeded.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of a dimming type discharge lamp lighting device showing one embodiment of the present invention.

An alternating current voltage from an alternating current power source l is supplied to a discharge lamp j via a p-light device, a rectifier 3, and an inverter circuit da.

A 1-phase determining circuit 6 is connected to the output end of the rectifier J, and the output of this phase determining circuit 6 controls the oscillation operation of the inverter circuit DA.

Next, the operation of the circuit shown in FIG. 1 will be explained. Second
The figures ((roll) to O) are based on the waveforms of alternating current voltages whose firing angles are controlled by dimmers. Second
The shaded portions in the figure each indicate the voltage waveform output from the dimmer.

FIG. 2(A) shows an example in which firing angle %i control is not performed.

FIGS. 2(B), (0), and (D) show the phase angles of -11-6 and 26, respectively. In this way, the AC voltage whose firing angle is controlled by the spotlight is passed through the rectifier J to form a rectangular waveform whose amplitude is one-sided and whose polarity is tx.
Ru.

Figure 3 (4), (Bl, and (0) respectively show the waveforms of the outputs of the AC voltage yl/, the light transmitter, and the rectifier J. In Figure 3, the shaded portion is the conduction period. shows.

Controlling the arc angle using a dimmer is generally done using a thyristor cape. When a gate pulse is applied to the gate electrode of the thyristor, the thyristor becomes conductive. Once the thyristor is in the conductive state, the gate voltage is Even if it is removed, the conduction state is maintained.

Therefore, when a pulse voltage with a different pulse phase in each cycle is applied as a gate signal, the conduction angle of the cyrisk becomes qualitative, and the angular charge current changes from 0 to io.

It is possible to continuously kill and recommend to the extreme.

The inverter circuit da has the discharge voltage necessary for discharging the discharge lamp 5 and the discharge lamp! This circuit supplies the cathode heating voltage.

By performing oscillation operation using the power transistor cape and extracting the oscillation frequency via the transformer, the discharge lamp 3
The discharge voltage and filament heating voltage are obtained.

The phase determination circuit 6 uses #! As shown in FIG. 3(C), the firing angle φ is detected, and this firing angle φ is a preset constant value φ1. The oscillation operation of the inverter circuit DA is continued until the firing angle φ exceeds the value of φMAI, and when the firing angle φ exceeds the value of φMAI, the oscillation operation of the inverter circuit DA is stopped.

Therefore, the firing angle f! The firing angle of the AC voltage applied IIJTh is φ14. When it exceeds
The phase determination circuit 6 operates to stop the oscillation of the first inverter q, so that the discharge lamp S is not dyed.

FIG. q is a circuit diagram showing details of the embodiment shown in FIG. 7.

The transistor Q has a voltage value V corresponding to the firing angle phase φ.
Determine the value of φ. 1 in the base circuit of transistor Q1
connected resistors FA, FB and Zener diode ZDO
By choosing the values appropriately.

VM corresponding to the limit phase φMAX, a voltage P greater than Jr.
It can be turned on when F joins the pace of transistor Q.

When transistor Q, l turns on, transistor Q, f
) Since the voltage between the base and the terminal ξ is extremely small, the transistor Q is turned off. At the bases of transistors Qj and Q4 that constitute the oscillation circuit in the inverter,
A T[fi voltage is provided to provide the bias current.

This DC current and pressure are applied to the coil L1. It is supplied by a diode D2% capacitor C1, a resistor 'Rs, and a resistor 'R4.

On the other hand, a transistor Q is connected to the connection point between the resistor R3 and the resistor F.
Since the collectors of , are connected, the transistor Qt
When is on, transistor q.

A resistor Ha is connected between the base and emitter of the transistor Q4 and
Since it becomes a trunk connected through f, the transistor Q
, and transistor Q4 are turned off and stop one-shot operation.

As mentioned above, when the voltage value Vφ corresponding to K and the firing angle φ has a voltage image v2□X value corresponding to the limit firing angle phase φMA, the transistor Q,)2 is always in the off state. Therefore, the transistors Qs and Q4 operate, and therefore the oscillation operation of the inverter circuit is maintained.

On the other hand, if the 1 firing angle phase φ exceeds the limit firing angle phase φMAI, the transistor Q is turned off, so the base of the transistor Q is supplied with the driving 11, and therefore the transistor Qx is turned on. Become.

As a result, the operation of transistors Qa and Q4 is stopped,
The oscillation operation inside the inverter stops.

Diode DI and capacitor CI are transistor Ql
A rectifier circuit is configured to supply a collector voltage of .

Resistor px and capacitor C1 form a charging circuit for driving the base of transistor Q. Also, the resistor R1 and the diode DI are connected to a capacitor 0. Call 111 to quickly discharge the accumulated charge and perform a quick reset.

In this way, resistor P1 and capacitor C! By providing a charging circuit consisting of a charging circuit and a discharging circuit consisting of a resistor R3 and a diode D, interlocking due to a short-term constant control phase is prevented. This prevents the discharge lamp j from flickering.

In the circuit shown in FIG. 41, transistors Q3 and Q are used to stop the oscillation operation of the inverter circuit.
Although the 1st position of the base of 4 is controlled, stopping of the oscillation operation is not limited to this method.

For example, by constructing a part of the single oscillation circuit using an element that performs a switching operation, and controlling the opening and closing of this element, it is also possible to stop the single oscillation operation.

In addition, in this embodiment, a method is used to detect the dipping angle phase using the corresponding voltage value, but it is easier to detect the operation of the P) square than by detecting the one firing angle phase trtim. Needless to say, it can be done.

In addition, in FIGS. 1 and 4, the configuration is such that rectification is performed when the firing angle is controlled.

The same holds true even if firing angle control is performed on the edge where rectification has been performed.

As explained in detail above, in this invention, when the firing angle phase exceeds a certain level, the oscillation operation of the inverter circuit is stopped and the discharge lamp is turned off, so that inadvertent p-light is prevented. Even if the lamp is operated, it has the advantage of preventing blackening of the discharge lamp due to insufficient preheating of the filament.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. The wJ diagram is a waveform diagram showing the details of firing angle control, FIG. 3 is a waveform diagram of each part of the first part, and the rabbit diagram is a detailed circuit diagram of the block diagram shown in FIG. 1. C... AC w source, U... dimmer, 3... V current, q
...Inverter circuit, S...Discharge lamp, 6...Also: constant circuit. Representative Kiyoshi Inomata, Commissioner of the Patent Office
Island 1) Spring stacking ・1. Indication of the case Patent Application No. 153033 of 1989 2, Name of the invention Dimmable discharge lamp lighting device 3, Person making the amendment Relationship to the case Patent applicant Specification and drawings 8, Contents of the amendment Specification and drawings Engraving (no changes in content).

Claims (1)

[Claims] The alternating current voltage with a controlled firing angle is supplied to an inverter via a rectifier, and the oscillation operation of the inverter boosts the voltage with the controlled firing angle and supplies Km to the discharge lamp, thereby regulating the discharge lamp. A dimmable discharge lamp lighting device for lighting the light, characterized by comprising a phase determination circuit that detects the value of the firing angle and stops the oscillation operation of the inverter when this value exceeds a value by one step. Dimmable discharge lamp lighting device.