JPS6319078B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a discharge lamp lighting device for disaster prevention lights using a high frequency lighting device that can be lit using either an AC power source or a DC power source. This relates to a device that sometimes dims and lights only one light.

BACKGROUND ART Conventionally, a device shown in FIG. 1 has been proposed as a device which can be lit using either an AC power source or a DC power source and which reduces the power supplied to a discharge lamp when DC power is supplied.

In FIG. 1, 1 is an AC power source, 2 is a high frequency generator and an inverter, 3 is a rectifier, 4 is a discharge lamp, 5 is a current limiting impedance that limits the current flowing through the discharge lamp 4, and 6 is a DC power source, which is the AC power source. When power supply 1 is out of power due to an emergency, it replaces AC power supply 1.
It supplies power to the high frequency generator 2.
7 is a control device, which includes a diode 8, a capacitor 9,
The relay coil 10 detects whether the AC power source 1 or the DC power source 6 is being supplied to the high frequency generator 2, and reduces the power supplied to the discharge lamp 4 when the DC power source 6 is being supplied. It's getting old. A capacitor 11 is the same type of impedance element as the current limiting impedance 5. 12
is the contact point of the relay coil 10, and the relay coil 10
When the capacitor 11 is excited, the capacitor 11 is short-circuited. 13 and 14 are capacitors that limit the current flowing through the filament of the discharge lamp 4.

In the conventional example configured as described above, when AC power supply 1 is supplied, this voltage is applied to control device 7, half-wave rectified by diode 8, and then charges capacitor 9. The relay coil 10 is then excited by this voltage, and its contacts 12 are closed. At the same time, the voltage of the AC power supply 1 is also supplied to the rectifier 3, and the voltage converted into a pulsating current by the rectifier 3 is applied to the high frequency generator 2. Then, it is converted into a high frequency of several tens of KHz by a high frequency generator and applied to the filament of the discharge lamp 4 and both ends of the discharge lamp, so that the discharge lamp 4 is lit. Then, the current limited by the current limiting impedance 5 flows into the discharge lamp 4, and the discharge lamp 4 continues to be lit.

Next, a case will be described in which the AC power supply 1 is out of power due to an emergency. When the DC power supply 6 is supplied to the control device 7, the capacitor 9 is not charged because the diode 8 is connected with the opposite polarity to the DC power supply 1, and therefore the relay coil 10 is not excited. Therefore, the contacts 12 of the relay coil 10 are in an open state. On the other hand, the voltage of the DC power supply 6 is supplied to the high frequency generator 2 via the rectifier 3. It is then converted into a high frequency wave by the high frequency generator 2 and supplied to the filament of the discharge lamp 4 and both ends of the discharge lamp 4 . Therefore, the discharge lamp 4 is started, and after the start, a current limited by the impedance of the series circuit of the capacitor 5 and the capacitor 11 flows, and the discharge lamp 4 is lit in a dimmed state.

However, this method of limiting impedance does not work in lighting fixtures that have two discharge lamps and are connected in series. I end up. Originally, in the case of lighting equipment for disaster prevention lights, it is only necessary to turn on one lamp at a reduced level, so if two lamps are turned on, the capacity of the DC power supply 1 becomes large. In addition, the method of limiting impedance requires the provision of an impedance element that is operated only when the light is dimmed, which has the disadvantage that the lighting device becomes large and expensive.

The present invention has been made to eliminate such conventional drawbacks, and provides a discharge lamp lighting device for disaster prevention lamps that is small and inexpensive without adding any special impedance element.

The present invention will be explained below with reference to FIG. 1st
The same parts as in the figures are given the same reference numerals, and the explanation will be omitted.

In the embodiment shown in FIG. 2, reference numeral 15 is a high frequency generator, whose secondary voltage is applied to the discharge lamps 2 connected in series.
The lights 16 and 17 are set to start reliably and to operate stably after starting. 18 is a relay coil of the control device 7, and 19 is its contact point.
Reference numeral 20 denotes a starting auxiliary impedance, which is composed of a series circuit of a resistor 21, a choke coil 22, and a capacitor 23. One end of the starting auxiliary impedance 20 is connected to one end of the contact 19 of the relay coil 18.
One end is connected to the high frequency generator 15, and the other end of the starting auxiliary impedance 20 is connected to the filament connection point of the discharge lamps 16, 17 connected in series. Furthermore, the contact point 1 is located between the starting auxiliary impedance 20, the choke coil 22, and the capacitor 23.
It is connected to No. 9 normally closed contact (b contact). Further, a normally open contact (a contact) of the contact 19 is connected to one end of the filament of the discharge lamp 16.

A capacitor 24 has the function of limiting the current flowing when the discharge lamps 16 and 17 are turned on. 2
5, 26, and 27 are capacitors that limit the current flowing through the filament.

In one embodiment of the present invention configured as described above, when AC power supply 1 is supplied, relay coil 1
8 is excited, and its contact 19 is connected to the normally open contact (a contact) side. On the other hand, the voltage of this AC power supply 1 is also supplied to a high frequency generator 15 via a rectifier 3. Then, the high frequency generator 15 generates several tens of K.
The voltage that is converted to a high frequency of Hz and boosted is
It is applied to both ends of the parallel circuit of the discharge lamp 16 and the starting auxiliary impedance 20, and the discharge lamp 17 connected in series with this parallel circuit. In addition, discharge lamps 16,1
Each filament of 7 is connected to a capacitor 25, 26,
27. Until the discharge lamps 16 and 17 are started, the impedance of the discharge lamps 16 and 17 is very high, so the output voltage of the high frequency generator 15 is applied to the discharge lamp 17 via the starting auxiliary impedance 20. Since this voltage is set to a voltage high enough to start the discharge lamp 17, the discharge lamp 17 starts. When the discharge lamp 17 starts, the voltage of the discharge lamp 17 decreases, and since most of the output voltage of the high frequency generator 15 is applied to the discharge lamp 16, the discharge lamp 16 also starts. and discharge lamp 1
After lights 6 and 17 are turned on, the current limited by the capacitor 24 flows to the discharge lamps 16 and 17.
7 lights up at the rated value.

Next, a case will be described in which the AC power supply 1 is out of power due to an emergency. The voltage of the DC power supply 6 is applied to the control device 7, but since the diode 8 of the control device 7 is connected to have the opposite polarity to the DC power supply 6, the capacitor 9 is not charged and the relay coil 18 is not charged. Since no voltage is applied to either, the relay coil 18 is not excited. Yotsute relay coil 18
The contact 19 is connected to the normally closed contact (b contact) side. At this time, the resistance 21 of the starting auxiliary impedance 20 and the choke coil 22 are short-circuited.

On the other hand, the voltage of the DC power supply 6 is supplied to the high frequency generator 15 via the rectifier 3. Then, the voltage is converted to a high frequency and the boosted voltage is passed through the capacitor 23 of the starting auxiliary impedance 20 to the discharge lamp 1.
7. Since the output voltage of the high frequency generator 15 is set to reliably start the discharge lamps 16 and 17 directly connected in series, the discharge lamp 17
If applied only to the engine, it will start without any problem. After starting, the current limiting impedance 24 and the capacitor 23 of the starting auxiliary impedance 20 are connected in series, and a current limited by this composite impedance flows to the discharge lamp 17.
The discharge lamp 17 is lit in a dimmed state.

FIG. 3 is a diagram showing another embodiment of the present invention, in which a chiyoke coil is used as the current limiting impedance 28 of the discharge lamp 17. One end of the contact 19 of the relay coil 18 of the control device 7 is connected to the capacitor 22 of the starting auxiliary impedance 20 and the chiyoke coil 2.
It is connected to the connection point of 3. When the relay coil 18 is not excited, the contact 19 is connected to the resistor 2.
1 and capacitor 22 are short-circuited. Therefore, when the AC power supply 1 is out of power in an emergency, the voltage of the high frequency generator 15 is changed to the starting auxiliary impedance 2.
The voltage is applied to the discharge lamp 17 through the 0-channel coil 23, and the discharge lamp 17 starts. and discharge lamp 1
7, a current limited by the impedance determined by the series circuit of the current-limiting impedance 28 and the starting auxiliary impedance 20 is determined by the series circuit of the current limiting impedance 28 and the starting auxiliary impedance 20.

As described above, the present invention is a discharge lamp lighting device for disaster prevention lights using a high frequency generator that can be lit using either an AC power source or a DC power source, and when two discharge lamps are connected in series and DC power is supplied. In this system, one lamp is turned on in a dimmed manner by effectively utilizing the starting auxiliary impedance.

In the description of the present invention, the starting auxiliary impedance is composed of a series circuit of a resistor, a capacitor, and a choke coil. This starting assist impedance is generally adopted in consideration of the occurrence of an abnormal phenomenon in the discharge lamp, but the present invention is not limited to this. That is, it is sufficient that the starting auxiliary impedance includes the same type of impedance element as the current limiting impedance. Further, when the current limiting impedance is a check coil, a tap may be provided on the check coil of the starting auxiliary impedance, as shown in FIG. 4, in order to adjust the current of the discharge lamp in the dimmed state.

As described above, the present invention is a discharge lamp lighting device for disaster prevention lights that can be lit using either an AC power source or a DC power source.
When two discharge lamps are connected in series, in the event of an AC power outage in an emergency, one lamp can be dimmed and lit using the DC power supply, and there is no need to add special impedance as a dimming method. Therefore, the lighting device has the characteristics of being small and inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional embodiment, FIG. 2 is a circuit diagram showing one embodiment of the present invention, and FIGS. 3 and 4 are circuit diagrams showing other embodiments. 1... AC power supply, 3... Rectifier, 6... DC power supply,
7...Control device, 15...High frequency generator, 16,1
7...Discharge lamp, 19...Relay contact, 20...Starting auxiliary impedance, 24, 28...Current limiting impedance. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] 1. A high-frequency generator for lighting a discharge lamp by converting power from an AC power source into direct current using a rectifier, and a high-frequency generator for generating the high-frequency power in place of the AC power source when the AC power source is out of power. In a discharge lamp lighting device for disaster prevention lights, which is equipped with a DC power source that supplies power to the device and lights up the discharge lamp, two discharge lamps connected in series to the high frequency generator and the AC power source are supplied. A current-limiting impedance that lights two discharge lamps at their rated values, an auxiliary impedance connected in parallel to one of the discharge lamps, and an auxiliary impedance that opens one of the discharge lamps when the DC power is supplied. A discharge lamp lighting device for a disaster prevention lamp, further comprising: a control device that short-circuits a part of the auxiliary impedance to reduce the high frequency power supplied to the other discharge lamp compared to when the AC power is supplied. 2. The discharge lamp lighting device for a disaster prevention lamp according to claim 1, wherein the auxiliary impedance includes the same type of impedance as the current-limiting impedance element.