JPH10289789A - Discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of instantaneously re-lighting a high pressure discharge lamp, such as a high pressure sodium lamp and the like at the power failure time of a commercial power source in a place where no emergency power source is available. SOLUTION: At the live time of an AC power source, a battery V2 is charged by a charge circuit E. A switching circuit X2 is connected to the battery V2 , and a power conversion circuit B which lights a high-pressure discharge lamp LA using the battery V2 as a power source is connected to the output terminal of the switching circuit X2 . An igniter IG2 , which applies a high voltage pulse voltage to the high pressure discharge lamp LA at the starting time of the high-pressure discharge lamp LA, is connected between the power conversion circuit B and the high pressure discharge lamp LA at the power failure time of an AC power source Vs. When power failure is detected by a power failure detection circuit F, a switching circuit X1 is opened so that the switching circuit X2 is closed by the output signal of the power failure detection circuit F, and the high-pressure discharge lamp LA is stably lighted by a circuit composed of the battery V2 , the switching circuit X2 , the power conversion circuit B, the igniter IG2 , and the high pressure discharge lamp LA.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp lighting device for lighting a high pressure discharge lamp such as a high pressure sodium lamp and a metal halide lamp.

[0002]

2. Description of the Related Art A sodium lamp is generally used as a light source for illuminating a tunnel. However, when the power supply from the commercial power supply to the lighting device is cut off due to a power failure,
The lights are extinguished, which is very dangerous for traveling vehicles. In order to avoid this kind of danger, in large tunnels such as expressways, an emergency power supply is provided for each tunnel, and when a commercial power outage occurs, the power supply circuit of the lighting equipment is switched to the emergency power supply and turned on again. The method has been adopted. Here, a low-pressure sodium lamp is mainly used as a conventional light source for illuminating the inside of a tunnel. Even if the lamp is turned off due to a power failure, the lamp is immediately turned on again when the emergency power supply is switched.

In recent years, instead of a low-pressure sodium lamp, a high-pressure sodium lamp with higher color rendering properties has been used as a light source, for example, for monitoring the inside of a tunnel with a camera. A high-pressure sodium lamp, unlike a low-pressure sodium lamp, generally requires a high-voltage pulse voltage of about 2,000 V to 5,000 V at the time of starting the lamp. High pulse voltage is required.

As an instantaneously relighting type lighting device for a high-pressure sodium lamp, for example, a lighting device having a circuit configuration as shown in FIG. 24 is provided. In the lighting device having the circuit configuration shown in FIG. 24, a pulse transformer T ₁₁ and a voltage-responsive switching element Q are connected to the output terminal of a copper-iron type ballast A including an inductance element L ₁₁ and a capacitor C ₁₁ to which an AC power supply Vs is connected. _11, to connect the igniter IG ₁ for generating a low-pressure pulse voltage becomes a capacitor C _12, C _13, igniter IG
A _first output terminal, a pulse transformer T _12, the voltage responsive switching element Q _12, and connect the igniter IG ₂ for generating a high-voltage pulse consists capacitor C _14, resistor R _11, a high pressure sodium at the output end of the igniter IG ₂ A high-pressure discharge lamp LA composed of a lamp is connected. Here, the igniter IG ₁ generates a pulse voltage of several kV, and the igniter I
G ₂ is to generate several tens kV pulse voltage the pulse voltage as a power supply. Therefore, in this lighting device, when the high-pressure discharge lamp LA goes out, a pulse voltage of several tens of kV is generated, and the lighting device can be re-lit instantaneously.

[0005]

However, many tunnels other than the large-sized tunnels described above do not have an emergency power supply for each tunnel, so that the lighting device having the circuit configuration shown in FIG. Sometimes cannot be re-lit. When a low-pressure sodium lamp is used as a light source, an emergency power supply (battery) is provided for each lighting fixture, and when a power failure occurs, the emergency power supply is used to relight the lamp. In the case of a lamp, it cannot be turned on again.

The present invention has been made in view of the above circumstances, and has as its object to discharge a high-pressure discharge lamp such as a high-pressure sodium lamp instantaneously when a commercial power supply fails in a place where there is no emergency power supply. A lighting device is provided.

[0007]

According to the first aspect of the present invention, there is provided a copper-iron type ballast having an inductance element and connected to an AC power supply, and a ballast connected to an output terminal of the ballast. A first igniter, a high-pressure discharge lamp connected to an output terminal of the first igniter, a charging circuit connected to an AC power supply for charging a battery, and a lighting circuit for lighting the high-pressure discharge lamp using the battery as a power supply. A power conversion circuit for supplying power,
A second igniter connected between the power conversion circuit and the high-pressure discharge lamp, a power failure detection circuit for detecting a power failure of the AC power supply, a ballast and the first power supply when the AC power supply is turned on based on an output of the power failure detection circuit; A first switching circuit that switches the high-pressure discharge lamp to be turned on via the igniter; and a high-voltage discharge via the power conversion circuit and the second igniter when the AC power supply fails based on the output of the power failure detection circuit. And a second switching circuit that switches so that the electric lamp is turned on. Even when a commercial power supply is interrupted in a tunnel or the like without an emergency power supply, a high-pressure discharge lamp is provided by using a battery as a power supply. Can be instantaneously relighted and maintained. As a result, it is possible to secure an illuminance that does not hinder the running of the vehicle even when the commercial power supply stops.

According to a second aspect of the present invention, in the first aspect, the power conversion circuit has a booster circuit for boosting the output voltage of the battery, and has at least a switching element and a choke coil, and is connected to an output terminal of the booster circuit. And a current limiting circuit for supplying desired power to the high-pressure discharge lamp, so that the high-pressure discharge lamp can be stably turned on. According to a third aspect of the present invention, since a filter circuit for removing high-frequency current is provided between the current limiting circuit and the second igniter in the second aspect of the present invention, a phenomenon that an arc fluctuates during lighting is caused. Problems can be prevented, and the high pressure discharge lamp can be more stably lit and maintained.

According to a fourth aspect of the present invention, a polarity inverting circuit for inverting the polarity of the output of the filter circuit at a low frequency is provided between the filter circuit and the second igniter. Since the polarity of the power supplied to the discharge lamp is inverted at a low frequency, it is possible to prevent the life of the high pressure discharge lamp from being shortened. The invention according to claim 5 is the invention according to claim 1, wherein the first
Since the igniter and the second igniter are commonly used, the number of parts can be reduced, and the size and cost can be reduced.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the first and second igniters generate a high-voltage pulse voltage large enough to instantaneously relight the high-pressure discharge lamp. The high-pressure discharge lamp can be reliably turned on again. In a seventh aspect based on the first aspect, the first switching circuit is provided between the ballast and the first igniter, and the second switching circuit controls an output of the power conversion circuit. Since it is provided between the control circuit and the control power supply circuit that generates power for the control circuit, a battery, a power conversion circuit, a second igniter,
A circuit composed of a high-pressure discharge lamp can be reliably operated by a small-capacity switching element at the time of a power failure.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, there is provided delay means for giving a delay time to the switching operation of the first switching circuit and the second switching circuit, so that both switching circuits are simultaneously closed or Opening can be reliably prevented. According to a ninth aspect of the present invention, in the eighth aspect, the delay means comprises:
When the power failure detection circuit detects a power failure of the AC power supply,
After the switching circuit is opened, the second switching circuit is closed, and when the AC power is restored, the second switching circuit is opened and then the first switching circuit is opened.
Is closed.

According to a tenth aspect of the present invention, in the second aspect, the booster circuit includes a switching element, and means for controlling the switching element so that an output voltage of the booster circuit becomes a predetermined value. It is a feature. The invention according to claim 11 is the invention according to claim 10, wherein
A step-up circuit, a transformer in which the primary side and the secondary side are reversely wound, the switching element connected in series to the primary winding of the transformer, and a diode in which the anode side is connected in series to the secondary winding of the transformer, It is a flyback type booster circuit having a secondary winding and a capacitor connected in parallel to a series circuit of a diode.

According to a twelfth aspect of the present invention, in the tenth aspect of the present invention, the step-up circuit includes a transformer having a primary side and a secondary side wound positively, and the switching element connected in series to a primary winding of the transformer. A first diode whose anode side is connected in series to a secondary winding of a transformer, a second diode connected in anti-parallel to a series circuit of the secondary winding and the first diode, and a second diode And a forward booster circuit having a choke coil and a series circuit of a capacitor connected in parallel with each other.

According to a thirteenth aspect of the present invention, in the tenth aspect, the booster circuit includes a series circuit of a choke coil and a switching element, and a series circuit of a diode and a capacitor connected in parallel to the switching element. A step-up circuit. According to a fourteenth aspect, in the tenth aspect, the predetermined value of the output voltage of the booster circuit is equal to or higher than a voltage across the discharge lamp necessary for starting the high pressure discharge lamp or a voltage between both ends of the discharge lamp required to maintain lighting of the high pressure discharge lamp. The voltage is higher than the voltage.

According to a fifteenth aspect of the present invention, in the tenth aspect, the predetermined value of the output voltage of the step-up circuit is appropriately changed according to an elapsed time after a power failure of the AC power supply. is there. According to a sixteenth aspect of the present invention, in the fifteenth aspect, the predetermined value of the output voltage of the booster circuit is set to a relatively large value until a predetermined time elapses after the AC power supply is cut off. After that, since it is set to a relatively small value, the startability of the high pressure discharge lamp is improved,
The time required to reach the rated output can be shortened.

According to a seventeenth aspect of the present invention, in the sixteenth aspect, the predetermined value of the output voltage of the step-up circuit is a discharge voltage necessary for starting the high-pressure discharge lamp until a predetermined time has elapsed after the AC power supply has stopped. Since the voltage is set to be equal to or higher than the voltage between both ends of the lamp, and is set so as to gradually decrease at a voltage equal to or higher than the voltage between both ends of the discharge lamp necessary for maintaining lighting of the high-pressure discharge lamp after a predetermined time, the energy of the battery can be used effectively. .

According to an eighteenth aspect of the present invention, in the second aspect, the current limiting circuit controls the switching element of the current limiting circuit such that an output voltage or an output current of the current limiting circuit becomes a predetermined value. It is characterized by having a means for performing. According to a nineteenth aspect of the present invention, in the invention of the eighteenth aspect, the predetermined value of each of the output voltage and the output current of the current limiting circuit is appropriately changed according to the elapsed time after the AC power supply is cut off. Energy can be used effectively.

A twentieth aspect of the present invention is a first power conversion circuit connected to an AC power supply for supplying power for lighting a high pressure discharge lamp, and a first power conversion circuit connected between the first power conversion circuit and the high pressure discharge lamp. A first igniter connected thereto, the high-pressure discharge lamp connected to an output terminal of the first igniter, a charging circuit connected to an AC power supply for charging a battery, and lighting the high-pressure discharge lamp using the battery as a power supply A second power conversion circuit that supplies power for the second power conversion circuit, a second igniter connected between the second power conversion circuit and the high-pressure discharge lamp, a power failure detection circuit that detects a power failure of the AC power supply, A first switching circuit for switching the high-pressure discharge lamp through the first power conversion circuit and the first igniter based on an output of the power failure detection circuit via the first power conversion circuit and the first igniter, and an output of the power failure detection circuit; Based on the AC power The at collector 2 of the power conversion circuit and the second
And a second switching circuit for switching the high-pressure discharge lamp to be turned on via the igniter, even if a commercial power supply is interrupted in a tunnel or the like without an emergency power supply. In addition, the high-pressure discharge lamp can be instantaneously relighted using the battery as a power source, and can be maintained. As a result, it is possible to secure an illuminance that does not hinder the running of the vehicle even when the commercial power supply stops.

According to a twenty-first aspect, in the twentieth aspect, each power conversion circuit has a booster circuit, at least a switching element and a choke coil, and supplies power for stably lighting the high-pressure discharge lamp. Since the power supply circuit includes the current circuit, it is possible to supply electric power necessary for starting and maintaining the lighting of the high-pressure discharge lamp, so that the high-pressure discharge lamp can be stably lit and maintained.

According to a twenty-second aspect of the present invention, in the twentieth aspect, the boosting circuit of the first power conversion circuit and the boosting circuit of the second power conversion circuit are shared, and based on the output of the power failure detection circuit. Since the step-up ratio of the step-up circuit is appropriately changed between the time when the AC power is supplied and the time when the power is interrupted, the number of components can be reduced, and the device can be reduced in size and cost. According to a twenty-third aspect of the present invention, in the first or twentieth aspect, the first igniter generates a relatively low-voltage pulse voltage for starting the high-pressure discharge lamp, and the second igniter generates the pulse voltage of the high-pressure discharge lamp. Since a relatively high-voltage pulse voltage for instantaneous relighting is generated, a relatively low-voltage pulse voltage required for starting the high-pressure discharge lamp is applied at the time of normal power on / off where instantaneous relighting is not required except during a power failure, The reliability and safety of parts can be improved.

According to a twenty-fourth aspect of the present invention, in the twenty-third aspect, there is provided an extinguishing detection circuit for detecting the extinguishing of the high-pressure discharge lamp when the AC power supply is energized, and the extinguishing detection circuit detects the extinguishing of the high-pressure discharge lamp. When the operation is performed, the second igniter is temporarily operated, so that even if the high-pressure discharge lamp goes out, the second igniter can be turned on again instantaneously by the output of the second igniter.

According to a twenty-fifth aspect of the present invention, in the first aspect, a dimming signal input circuit to which a dimming signal is input is provided,
When a dimming signal is input to the dimming signal input circuit, the first switching circuit is opened based on the output of the dimming signal input circuit and the second switching circuit is opened.
And the output of the second power conversion circuit is controlled, so that a dimming function can be provided with a simple configuration.

According to a twenty-sixth aspect of the present invention, in the first aspect of the present invention, there is provided an extinguishing detection circuit for detecting the extinguishing of the high-pressure discharge lamp when the AC power is supplied, and the extinguishing detection circuit detects the extinguishing of the high-pressure discharge lamp. Sometimes, the first switching circuit is opened and the second switching circuit is closed, so that even if the high-pressure discharge lamp goes out for some reason, it can be turned on again and maintained.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 shows a circuit block diagram of a discharge lamp lighting device of the present embodiment. In this embodiment, as shown in FIG. 1, an input terminal TM ₁ ,
Via a TM ₂ , a copper-iron type ballast A comprising an inductance element L ₁₁ and a capacitor C ₁₁ for stably lighting the high-pressure discharge lamp LA is connected. through the circuit X _1, it connects the igniter IG ₁ applied to the high pressure discharge lamp LA high pressure pulse voltage at the start of the high pressure discharge lamp LA.

In the present embodiment, the AC power supply Vs
The charging circuit E is connected via the input terminals TM ₁ and TM ₂ . The output terminal of the charging circuit E is connected to the battery connection terminals TM ₃ , T
It is connected to the battery V ₂ through M _4. Here, the charging circuit E is a circuit for charging the battery V _2. In addition, battery V ₂
The connects the switching circuit X ₂ described later via a battery connection terminal TM _3, TM _4, the output terminal of the switching circuit X _2, battery V ₂
Conversion circuit B for lighting high-pressure discharge lamp LA using power supply
Are connected. Between the power conversion circuit B and the high-pressure discharge lamp LA, the high-pressure discharge lamp LA
And a high-voltage pulse to connect the igniter IG ₂ to be applied to the high pressure discharge lamp LA at the start of the. Further, the AC power supply V
s is connected to an AC power supply V via input terminals TM ₁ and TM _2.
The power outage detection circuit F that detects the power outage of s is connected. The switching circuits X ₁ and X ₂ are closed or opened by the output signal of the power failure detection circuit F.

[0026] In this embodiment, the AC power source Vs at the time of energization, and closing the switching circuit X _1, by opening the switching circuit X _2, AC power source Vs, switching circuit X _1, igniter I
G ₁ : The high-pressure discharge lamp LA is stably turned on by a circuit (AC power supply circuit) constituted by the high-pressure discharge lamp LA, and the battery V ₂ is charged by the charging circuit E. On the other hand, the AC power source Vs is power failure, the power failure detection circuit F detects the power failure, the switching circuit X ₁ is open switching circuit X ₂ is closed by the output signal of the power failure detection circuit F, a battery V _2, switch Circuit X ₂ , power conversion circuit B, igniter IG ₂ , and high-pressure discharge lamp LA
Light A stably.

FIG. 2 shows an example in which the power conversion circuit B in FIG. 1 is composed of a booster circuit G and a current limiting circuit H. here,
The current limiting circuit H is configured by a step-down chopper circuit including a switching element Q ₂₁ composed of a MOSFET, a choke coil L ₂₁ , a diode D _{21 and the} like. In this device, the voltage of the battery V ₂ (for example, 24 V) is increased by, for example, 25
Boosted to 0V, and the control circuit of the switching element Q ₂₁ is connected to the gate of the switching element Q ₂₁ (not shown)
By turning on and off (switching) at a frequency of several tens of kHz, desired power is supplied to the high-pressure discharge lamp LA, and the high-pressure discharge lamp LA can be stably turned on and maintained.

(Embodiment 2) FIG. 3 shows a circuit diagram of a discharge lamp lighting device according to this embodiment. By the way, when high-frequency power is supplied to the high-pressure discharge lamp LA, a phenomenon that an arc fluctuates during lighting may occur. To solve this kind of problem, as shown in FIG.
Between the limiting circuit H and igniter IG ₂ in, choke coil L _22, may be connected to filter circuit I consisting of the capacitor C _21. Filter circuit I is a high frequency power (high frequency current) limiting circuit H is outputted bypassed by capacitor C _21, so outputs a direct-current power obtained by removing high-frequency components, the high pressure discharge lamp LA by providing a filter circuit I Lighting can be maintained more stably.

(Embodiment 3) FIG. 4 is a circuit diagram of a discharge lamp lighting device according to this embodiment. The basic configuration of this embodiment is substantially the same as the circuit configuration of FIG. 3 shown in the second embodiment, between the filter circuit I and igniter IG _2, points having a polarity inverting circuit J is the second embodiment Different.

By the way, generally, the high pressure discharge lamp LA is directly
When the lamp is turned on, the electrode of the high-pressure discharge lamp LA deteriorates,
The life of the discharge lamp LA may be shortened. this
On the other hand, in the present embodiment, the switching element Q_{twenty two}, Q_{twenty five}
Is on and switching element Q _{twenty three}, Q_{twenty four}Is off,
Switching element Q_{twenty three}, Q_{twenty four}Is on and the switching element
Q_{twenty two}, Q_{twenty five}Is turned off and the low frequency alternately (for example,
(Several tens to several hundreds of Hz).
An alternating lamp current flows at a frequency. In short, this implementation
In the embodiment, the polarity of the power supplied to the high-pressure discharge lamp LA is
As it is reversed by waves, stress is applied to the electrode on one side of the lamp
Of the high-pressure discharge lamp LA.
Can be stopped. Note that the switching element Q_{twenty two}, Q
_{twenty five}, Q_{twenty three}, Q_{twenty four}Consists of MOSFETs,
On / off by a control circuit (not shown) connected to the
Controlled.

(Embodiment 4) FIG. 5 shows a discharge lamp according to this embodiment.
1 shows a circuit diagram of a lighting device. The basic configuration of this embodiment is
The ignition system according to the third embodiment is substantially the same as the third embodiment.
Ita IG₁, IG_TwoThe feature is that they are shared. here
Igniter IG ₁Igniter I
G₁A DC voltage for driving is supplied.

In this embodiment, when the AC power supply Vs is energized,
Connects the AC output of the copper-iron type ballast A to the diode bridge D
B₃₁, Capacitor C₃₁Rectifier smoothing by igniter
IG ₁To supply. Also, when the AC power supply Vs
Is the DC power at the output terminal of the filter circuit I of the power conversion circuit B.
Pressure is diode D₃₂Through igniter IG₁Supplied to
It is. Note that the capacitor C₃₂Is igniter IG₁Out of
For applying a high pressure pulse voltage to the high pressure discharge lamp LA.
Things.

In the present embodiment, since the igniters IG ₁ and IG ₂ of the third embodiment are shared, the number of parts can be reduced, and the size and cost of the device can be reduced. FIG. 6 is a view specifically showing the configuration of the igniter IG ₁ in FIG. Here, igniter IG
₁ generates a high-voltage pulse voltage that can instantaneously relight the high-pressure discharge lamp LA.

[0034] Igniter IG₁Is the capacitor C₃₁Both ends
And the resistance R₃₁, Capacitor C₃₃so
Capacitor C depends on the time constant determined₃₃Charge the conden
Sa C ₃₃Is the voltage-responsive switching element Q₃₁of
When the breakover voltage is reached, the switching element Q
₃₁Turns on and capacitor C₃₃The charge stored in the
Strans T₃₁Discharge through the primary winding. Then
Pulse transformer T₃₁Pulse transformer T according to the turns ratio of
₃₁Energy is transmitted to the secondary side of the diode D ₃₃Through
Capacitor C₃₄Charge. Repeat the above operation,
Capacitor C₃₄Voltage rises across the spark gap
Q₃₂Spark gap when the breakover voltage
Q₃₂Breaks down and the capacitor C₃₄Accumulated charge
The pulse transformer T₃₂Discharge through the primary winding. You
Then, the pulse transformer T₃₂Pulse traverse according to the turns ratio of
Once T₃₂Is transmitted to the secondary side of the igniter I
G ₁Tens kV high voltage pulse voltage is generated at the output of
Capacitor C for high pulse voltage₃₂High pressure discharge lamp LA
Is applied.

Therefore, even if the AC power supply Vs is interrupted after the normal lighting, the switching circuit X ₂ is closed, and the high voltage pulse voltage of several tens kV is supplied to the high pressure discharge lamp LA by the igniter IG ₁ using the battery V ₂ as a power supply. As a result, the high-pressure discharge lamp LA can be re-lit instantaneously. Further, even if the AC power source Vs is switched circuit X ₂ closed switching circuit X ₁ is opened power recovery to the power failure, several tens kV by igniter IG ₁
Can be supplied to the high-pressure discharge lamp LA,
The high-pressure discharge lamp LA can be instantly relighted.

(Embodiment 5) FIG. 7 is a circuit diagram of a discharge lamp lighting device according to this embodiment. In the present embodiment, the fourth embodiment
And a current limiting circuit H and the filter circuit I and the polarity inversion circuit J in the power conversion circuit B used in the switching elements Q _{22,
Q 23, Q 24, Q 25} , diode D _21, D _22, the choke coil L _21, L _22, is obtained by construction of full-bridge circuit K due to the capacitor C _21.

[0037] Here, the switching element Q ₂₃ and the switching element Q ₂₅ repeats on and off alternately at a low frequency of several tens to several hundreds Hz. During the period the switching element Q ₂₃ is on, the repeated on-off switching element Q ₂₄ is at a high frequency of several tens kHz (switching elements Q _22, Q ₂₅ are turned off), the period the switching element Q ₂₅ is turned on, the switching element Q ₂₂ repeats on and off at a high frequency of several tens kHz (switching elements Q _23, Q ₂₄ are turned off). The switching element Q ₂₂ to Q ₂₅ is made of MOSFET, turning on and off of the switching element Q ₂₂ to Q ₂₅ is controlled by a connected to the gate control circuit (not shown).

[0038] Here, when the switching element Q ₂₂ is turned on (the switching element Q ₂₅ is turned on, the switching element Q _23, Q ₂₄ are turned off), the switching elements Q _22, the choke coil L _21, igniter IG _1, chalk Coil L
_22, the current flows in the path of the switching element Q _25, the switching element Q ₂₂ is turned off (switching element Q ₂₅ is turned on, the switching element Q _23, Q ₂₄ is turned off) and, stored energy of the choke coil L ₂₁ is a choke coil L ₂₁ , igniter IG ₁ , choke coil L ₂₂ , switching element Q ₂₅ , diode D ₂₁ , and choke coil L ₂₁ are emitted.

When the switching element Q ₂₄ is on (the switching element Q ₂₃ is on and the switching elements Q ₂₂ and Q ₂₅ are off), the switching element Q ₂₄ , the choke coil L ₂₂ , the igniter IG ₁ , and the choke coil L
_21, the current flows in the path of the switching element Q _23, the switching element Q ₂₄ is turned off (switching element Q ₂₃ is turned on, the switching element Q _22, Q ₂₅ is turned off) and, stored energy choke coil of the choke coil L ₂₁ L _21, the switching elements Q _23, diode D _22, a choke coil L
₂₂ , the igniter IG ₁ and the choke coil L ₂₁ are discharged. Here, in the present embodiment, the choke coil L
_A filter circuit is constituted by ₂₂ and the capacitor C ₂₁ .
That is, the switching element Q ₂₂ of the switching element Q ₂₁ is 7 in FIG. 6 (Q _24), similarly to the choke coil L ₂₁ is the choke coil L _21, a diode D ₂₁ is a diode D
To ₂₁ (D _22), the choke coil L ₂₂ is the choke coil L
_22, capacitor C ₂₁ is equivalent to the capacitor C _21.

[0040] In this embodiment, the switching element Q ₂₃ and the switching element Q ₂₅ is repeated alternately turned on and off at a low frequency, it is possible to supply power to alternating at a low frequency to the high pressure discharge lamp LA, a high pressure discharge lamp LA Can be shortened. (Embodiment 6) FIG. 8 is a circuit diagram of a discharge lamp lighting device according to this embodiment.

In this embodiment, the power conversion used in the fourth embodiment is described.
The current limiting circuit H and the filter circuit I in the conversion circuit B have opposite polarities.
Switching circuit J and switching element Q_{twenty two}, Q_{twenty three}, Daioh
Do D _{twenty one}, D_{twenty two}, Choke coil L_{twenty one}, L_{twenty two}, Condenser
C_{twenty one}, C_{twenty two}, C_{twenty three}By half bridge circuit L
It has been achieved. In this embodiment, the switching element
Q_{twenty three}Is off and switching element Q_{twenty two}Is high frequency of several tens of kHz
On and off by the wave and the switching element Q_{twenty two}But
Switching element Q_{twenty three}Is turned on at high frequency of tens of kHz
It is turned off at a low frequency (several tens to hundreds of Hz).
repeat.

[0042] Here, in the period when the switching element Q ₂₃ is the switching element Q ₂₂ off is high-frequency switching, when the switching element Q ₂₂ is turned on, the capacitor C _22, the switching elements Q _22, the choke coil L _22, igniter IG _1, the choke coil L _21, a current flows through a path of the capacitor C _22, is turned off the switching element Q ₂₂ is, the choke coil L ₂₁ of stored energy choke coil L _21, capacitor C _23, a diode D _22, a choke coil L ₂₂ , the igniter IG ₁ and the choke coil L ₂₁ are discharged.

The switching element Q_{twenty two}Is off and sui
Switching element Q_{twenty three}During high-frequency switching
The switching element Q_{twenty three}Is on,
Sa C _{twenty three}, Choke coil L_{twenty one}, Igniter IG₁, Cho
Arc coil L_{twenty two}, Switching element Q_{twenty three}, Capacitor C
_{twenty three}Current flows through the path of the switching element Q_{twenty three}Turns off
Then, choke coil L_{twenty one}The stored energy of the chalk
Coil L_{twenty one}, Igniter IG₁, Choke coil L_{twenty two},
Diode D_{twenty one}, Capacitor C_{twenty two}, Choke coil L_{twenty one}
It is released by the route.

Here, in this embodiment, the choke coil
L_{twenty two}And capacitor C_{twenty one}Constitute a filter circuit. One
That is, the switching element Q shown in FIG._{twenty one}Is the switch in FIG.
Element Q_{twenty two}(Q_{twenty three}), The choke coil L_{twenty one}But
Yoke coil L_{twenty one}And diode D_{twenty one}Is diode D_{twenty one}
(D_{twenty two}), Choke coil L_{twenty two}Is the choke coil L _{twenty two}
And the capacitor C_{twenty one}Is the capacitor C_{twenty one}Is equivalent to

In this embodiment, the switching element Q_{twenty two}When
Switching element Q_{twenty three}High frequency on / off operation of low frequency
The power alternating at low frequency is discharged to high voltage
It can be supplied to the lamp LA. (Embodiment 7) FIG. 9 shows the discharge lamp lighting device of this embodiment.
A road map is shown. FIG. 9 shows the switching circuit X in FIG.₁, X_Two,
Specific examples of the power failure detection circuit F and the charging circuit E are shown.
It is. The switching circuit X₁Relay contact r
It is closed when the source Vs is energized. P in FIG.
The control power supply circuit P includes a power transformer T
₄₁The voltage of the AC power supply Vs is stepped down by the
Ridge DB₄₁, Diode D₄₃, Capacitor C₄₁By
Circuit for rectifying and smoothing and creating a control power supply Vcc (for example, 12 V)
It is. The charging circuit E includes a diode D₄₂, Resistance R₄₁From
And the resistance R₄₁V due to charging current limited by_TwoTo
Charge. The power failure detection circuit F is connected to the power supply of the control power supply circuit P.
Lance T₄₁Stepped down by diode bridge DB₄₁In order
Flow resistance R₅₁, R₅₂Voltage obtained by dividing
Capacitor C₅₁And the capacitor C₅₁Voltage across
And the voltage of the control power supply Vcc is ₅₃, R₅₄Divided by
The reference voltage obtained by the comparator IC₅₁Compare with
You.

Here, the power failure detection circuit F is provided with an AC power supply Vs
When a power failure occurs, the comparator IC₅₁Output is high level
To low level. Comparator IC₅₁Output
Becomes low level, the relay excitation coil RL₁Current
Stops flowing and the switching circuit X ₁Relay contact r is open
It is. Comparator IC₅₁Output goes low
Then, the switching circuit X_TwoThen, transistor Q₆₁Turns off
And transistor Q₆₂Turns on, and transistor Q
₆₃Is turned on, and the control power supply Vcc is supplied to the control circuit M.
Then, the control circuit M performs switching of the power conversion circuit B.
Element Q_{twenty one}And switching element Q_{twenty two}~ Q_{twenty five}The third embodiment
The on / off control is performed as described above. At this time,
The power conversion circuit B has a battery V_TwoVoltage is supplied and the power
In the conversion circuit B, the battery V_TwoIs boosted by the booster circuit G
Is done.

[0047] Thus, even if the power failure AC power source Vs, since the output of the power conversion circuit B is supplied to the igniter IG _1, instantaneously relighting the high pressure discharge lamp LA, a it is possible to stabilize the lighting . In the present embodiment, the switching circuit X ₂
Is provided between the control power supply circuit P and the control circuit M, so that the AC power supply power failure circuit composed of the battery V ₂ , the power conversion circuit B, and the igniter IG ₂ is reliably operated by a small-capacity switching element at the time of power failure. be able to.

(Embodiment 8) FIG. 10 is a circuit diagram of a discharge lamp lighting device according to this embodiment. The basic configuration of the present embodiment is substantially the same as that of the seventh embodiment, and FIG.
And a delay circuit N to the output side of the power failure detection circuit F differs from the switching circuit X ₁ and the switching circuit embodiment 7 in that gave a delay time for the operation of the X ₂ in.

Hereinafter, the characteristic operation will be described with reference to FIG.
explain. Now, time t₁AC power supply Vs at blackout
(See FIG. 11A), the comparator IC
₅₁Changes from a high level to a low level (see FIG. 1).
1 (b)). Then, the resistance R of the delay circuit₅₅And conde
Sensor C₅₂Time t, delayed by the time determined by the time constant_Two
Comparator IC₅₂Output from high level to low level
(See FIG. 11C). In addition,
TA IC₅₁And the output of the comparator IC are AND times
Road IC₅₃AND circuit IC ₅₃Output
Is the time t₁Changes from high level to low level
(See FIG. 11D). AND circuit IC₅₃Output is low
Level, the relay excitation coil RL₁Electric current flows through
And switching circuit X₁Relay contact r is open (off)
(See FIG. 11E). On the other hand, the switching circuit X_TwoNo
Anti-R₆₁, R₆₄Is connected to the comparator IC₅₁Output
End is diode D₆₁And the comparator I
C₅₂Output terminal is diode D₆₂Connected via
Switching circuit X_TwoIs a comparator IC₅₁Output and Comparator
Rator IC₅₂It operates according to the OR signal with the output of. Toes
Switching circuit X_TwoIs the diode D₆₁Output at time t_Two
At low level (see FIG. 11 (f)).
Star Q₆₃Turns on (see FIG. 11 (g)). Accordingly
Time t₁And switching circuit X₁Is released at time t_Two
And switching circuit X_TwoCloses.

Thereafter, at time t_ThreeAt the AC power supply Vs
When power is supplied (restored) (see FIG. 11A), the comparator
TA IC₅₁Output changes from low level to high level
(See FIG. 11B). After that, the resistance of the delay circuit
R₅₅And capacitor C₅₂Is delayed by the time determined by the time constant of
Time t_FourComparator IC₅₂Output is low level
To a high level (see FIG. 11C), and AND
Circuit IC₅₃Output changes from low level to high level.
(See FIG. 11D). AND circuit IC₅₃Output is
Level, the relay excitation coil RL₁Current flows through
Switching circuit X ₁Relay contact r is closed (on)
(See FIG. 11E). On the other hand, the switching circuit X_TwoThe daio
Code D₆₁Output at time t_ThreeTo a high level (Fig. 11
(F)) and the transistor Q₆₃Turns off (FIG. 11)
(G)). Therefore, at time t_ThreeAnd switching circuit X_TwoBut
Released at time t_FourAnd switching circuit X₁Is closed.

Thus, in this embodiment, the switching circuit X ₁
Since a are operated to have a delay time of the switching circuit X _2, from both switching circuit X _1, X ₂ are simultaneously closed or opened can be reliably prevented, troubles such as contact welding due to the simultaneous ON contact Can be prevented. (Embodiment 9) FIG. 12 is a circuit diagram of a discharge lamp lighting device according to this embodiment.

In the discharge lamp lighting device of the present embodiment, the booster circuit G of the eighth embodiment is obtained by replacing the primary and secondary sides with a transformer T ₂₁ , a switching element Q ₂₆ , and a diode D
₂₃ constitute a converter of the flyback type comprising a capacitor C _24. Here, the booster circuit G is off (switching) the switching element Q ₂₆ is at a high frequency of several tens kHz, the energy stored in the primary winding of the transformer T ₂₁ to when the switching element Q _26, the switching element Q ₂₆ the transmitted to the secondary winding of the transformer T ₂₁ at the time of off, via the diode D ₂₃ to charge the capacitor C _24. Further, the booster circuit G detects the voltage between both ends of the capacitor C ₂₄ by the output voltage detection circuit 20, and the output voltage detection circuit 20 feeds back the on / off ratio of the switching element Q ₂₆ based on the voltage between both ends of the capacitor C _24. Control and
Outputs a predetermined voltage.

(Embodiment 10) FIG. 13 is a circuit diagram of a discharge lamp lighting device according to this embodiment. In the discharge lamp lighting device of the present embodiment, the booster circuit G of the eighth embodiment includes a transformer T ₂₁ in which the primary side and the secondary side are wound forward, a switching element Q
_26, the diode D _23, D _24, the choke coil L _23, are constituted by the converter of the forward type comprising a capacitor C _24.

Here, the booster circuit G is a switching element
Q₂₆Is on / off (switching) at high frequency of several tens of kHz
And the switching element Q₂₆When the transformer T_{twenty one}of
The energy stored in the primary winding is simultaneously transferred to the transformer T_{twenty one}No
Transmit to the next winding, diode D_{twenty three}, Choke coil L_{twenty three}
Through the capacitor C_{twenty four}Charge. Also, the booster circuit G
Is the capacitor C_{twenty four}Output voltage detection circuit 20
And the output voltage detection circuit 20 is a capacitor
C_{twenty four}Switching element Q based on the voltage across ₂₆On
Feedback control of OFF ratio to output a predetermined voltage
You.

(Embodiment 11) FIG. 14 is a circuit diagram of a discharge lamp lighting device according to this embodiment. In the discharge lamp lighting device according to the present embodiment, the booster circuit G according to the eighth embodiment includes a booster chopper including a choke coil L ₂₄ , a switching element Q ₂₇ , a diode D ₂₅ , and a capacitor C ₂₄ .

Here, in the booster circuit G, the switching element Q ₂₇ is turned on / off (switching) at a high frequency of several tens of kHz.
Is, the energy stored in the choke coil L ₂₄ to when the switching element Q _27, to charge the capacitor C ₂₄ through the diode D ₂₅ and released upon off of the switching element Q _27. Further, the booster circuit G detects the voltage between both ends of the capacitor C ₂₄ by the output voltage detection circuit 20, and the output voltage detection circuit 20 feeds back the on / off ratio of the switching element Q ₂₆ based on the voltage between both ends of the capacitor C _24. It controls and outputs a predetermined voltage.

[0057] Also when the AC power source Vs is a power failure in any of the booster circuit G in FIGS. 12 to 14, the voltage of the battery V ₂ (e.g., 24V) necessary to re-lighting of the high-pressure discharge lamp LA from voltage (for example 250V; high voltage pulse (Excluding the voltage), so that the lighting can be maintained even after the high pressure discharge lamp LA is turned on. (Embodiment 12) By the way, the high pressure discharge lamp LA needs a relatively high voltage for starting even if the high voltage pulse voltage is excluded,
After lighting, the lighting can be maintained at a voltage relatively lower than the voltage required for starting. Also, since the high-pressure discharge lamp LA requires a certain period of time from startup to the rated output (start-up process), it is necessary to supply more current to the high-pressure discharge lamp LA in order to shorten the start-up process time. There is.

The basic configuration of the present embodiment is substantially the same as that of the ninth to eleventh embodiments, and the output voltage of the booster circuit G in FIGS. 12 to 14 is changed as shown in FIG. to reach the rated output (up to time t _11), or to a high pressure discharge lamp LA is started, by setting a higher voltage than during stable lighting, to enhance the startability of the high pressure discharge lamp LA, the rated output It is possible to shorten the time required to become.

The battery V _{2, which} is the power source of the circuit that operates when the AC power source Vs fails, has finite energy. On the other hand, if the illuminance suddenly drops during a power outage, it will be extremely dark,
Even if the illuminance is gradually lowered after several seconds to several tens of seconds, the eyes adapt and do not feel so dark. Therefore, FIG.
5 (b) as shown in, for example, by the time t ₁₁ 'after the human eye adapts set to go down gradually the output voltage of the booster circuit, enable finite energy of the battery V ₂ Can be used for

(Embodiment 13) FIG.
1 shows a circuit diagram of an electric light lighting device. The basic configuration of this embodiment is
The power conversion is substantially the same as that of the ninth embodiment shown in FIG.
The output terminal of the filter circuit I of the circuit B detects the voltage of the output terminal.
An output voltage detection circuit 21 is provided.
21 based on the voltage detected by the current limiting circuit H.
Switching element Q_{twenty one}The on / off ratio is controlled.
Therefore, a predetermined voltage can be output. Ma
In addition, as shown in FIG.
The same as in the twelfth embodiment by setting
And battery V _TwoCan effectively use the finite energy of
it can.

(Embodiment 14) FIG. 18 is a circuit diagram of a discharge lamp lighting device according to this embodiment. This embodiment is a circuit for lighting the high-pressure discharge lamp LA when the AC power supply Vs is energized.
A switching circuit X _1, between the igniter IG _1, is provided with a power conversion circuit B '. The basic circuit configuration of power conversion circuit B ′ is substantially the same as power conversion circuit B in FIG. 14 described in the eleventh embodiment. In the present embodiment,
The power conversion circuit B ′ includes the filter circuit I ′ and the polarity inversion circuit J ′, but it is sufficient that the power conversion circuit B ′ includes at least the booster circuit G ′ and the current limiting circuit H ′. Here, the booster circuit G ′
Is constituted by a boost type chopper including a choke coil L ₇₁ , a switching element Q ₇₁ , a diode D ₇₂ , and a capacitor C ₇₁ .

In this embodiment, the AC power supply Vs (for example, A
During energization of C200V), rectifies the AC power source Vs with a diode bridge DB _71, starting the high pressure discharge lamp LA by the boost circuit G 'the output voltage of the diode bridge DB _71, the boost to the required voltage sustaining (eg 250V) can do. (Embodiment 15) FIG. 19 is a circuit diagram of a discharge lamp lighting device according to this embodiment.

In the present embodiment, in the discharge lamp lighting device of the fourteenth embodiment, the power conversion circuit B and the power conversion circuit B are shared (that is, the boosting circuit G ′ and the boosting circuit G are shared). ), The output of the power failure detection circuit F causes the control circuit M to control the switching element Q _{71 of the} booster circuit G ′.
The on-off ratio is changed, and the step-up ratio is appropriately changed.

Therefore, in this embodiment, the high-pressure discharge lamp LA can be started and lit with a small number of components even when the power supply voltage is different, such as when the AC power supply Vs is energized and during a power failure. (Embodiment 16) FIG. 20 is a circuit diagram of a discharge lamp lighting device according to this embodiment.

[0065] In this embodiment, as shown in FIG. 20, the igniter IG ₁ for generating a pulse voltage at the time of energization of the AC power source Vs, provided separately and igniter IG ₂ for generating a pulse voltage at the time of interruption of the AC power source Vs ing. Here, the igniter IG ₁ is configured to generate a relatively low pulse voltage enough to start the high pressure discharge lamp LA, a relatively high pressure pulse of only igniter IG ₂ is a high pressure discharge lamp LA is instantaneously relight It is configured to generate a voltage.

In this embodiment, the igniter IG₁The
Rus transformer T₃₃, Capacitor C₃₅, C₃₆, Voltage response
Switching element Q₃₃Igniter
IG ₁Voltage-responsive switching element Q
₃₃When the voltage reaches the breakover voltage, the voltage response
Switching element Q₃₃Turns on and the pulse transformer T ₃₃
A pulse voltage corresponding to the turns ratio of the high-pressure discharge lamp LA is
Be added. When the high pressure discharge lamp LA is turned on, the igniter I
G₁The voltage between both ends of the
Q₃₃Pulse voltage
Generation stops.

Thus, in this embodiment, at the time of a normal power on / off operation that does not require instantaneous relighting other than during a power failure, a relatively low-voltage pulse voltage required for starting the high-pressure discharge lamp LA is generated. Reliability and safety can be improved. (Embodiment 17) FIG. 21 is a circuit diagram of a discharge lamp lighting device according to this embodiment.

By the way, generally, the high pressure discharge lamp LA is
If the output of the AC power supply Vs decreases instantaneously, it may go out (for example, it may go out even if it drops by about 10% per cycle). The basic configuration of this embodiment is substantially the same as that of FIG. 20 described in the sixteenth embodiment. The high-pressure discharge lamp LA is provided with an extinguishing detection circuit 30 for detecting the extinguishing of the high-pressure discharge lamp LA. when is obtained by so as to temporarily operate the igniter IG _2.

In the present embodiment, the falling edge detection circuit 30
When the extinguishing of the high pressure discharge lamp LA is detected, the extinguishing is performed.
Switching circuit X in accordance with the output signal of the_TwoSui
Switching element Q₆₄Is turned on to supply power to the control circuit M
And the switching element of the booster circuit G in the power conversion circuit B
Q₂₆And the switching element Q of the current limiting circuit H_{twenty one}Only switch
(The polarity inversion circuit J is kept stopped).
Then, igniter IG _TwoWorks and the relatively high pressure pal
Voltage is generated and applied to the high pressure discharge lamp LA.

[0070] Thus, in the present embodiment, while supplying a voltage with copper iron ballast A, it is possible to relight instantly by igniter IG _2. (Embodiment 18) FIG. 22 is a circuit diagram of a discharge lamp lighting device according to this embodiment. The basic configuration of this embodiment is the same as that of the first embodiment.
This is substantially the same as FIG. 16 described in FIG. 3, and is different from the thirteenth embodiment in that dimming signal input terminals TM ₅ and TM ₆ are provided so that the high-pressure discharge lamp LA can be dimmed and lit.

In the present embodiment, when a dimming signal is input to the dimming signal input terminals TM ₅ and TM ₆ from the outside when the AC power supply Vs is energized, the dimming determination circuit 50 (dimming signal input circuit). Switching element Q of power failure detection circuit F by output
₅₁ is turned on, and the above-described AC power supply power failure circuit is operated even though there is no power failure. Further, the lighting control and dimming on-off ratio of the switching element Q ₂₁ of the current limiting circuit H from the control circuit M of the power conversion circuit B. Although the energy of the battery V ₂ is consumed, so continue to be charged from the AC power source Vs, the voltage of the battery V ₂ is not lowered. Therefore, a dimming function can be provided with a simple configuration.

(Embodiment 19) FIG. 23 is a circuit diagram of a discharge lamp lighting device according to this embodiment. By the way, AC power supply Vs
There is a case where the high-pressure discharge lamp LA goes out for some reason when the power is supplied. In the present embodiment, in order to solve a problem of this kind, the off detection circuit 40 is provided, the power failure detection circuit F, is provided with a switching element Q ₅₁ is turned on and off controlled by the output of the off detection circuit 40.

The copper-iron type ballast A is generally made of an insulating material.
If used for a long time, insulation will deteriorate and
Il L₁₁Abnormal (excessive) current flows through the choke coil
Le L ₁₁May emit smoke. In the present embodiment,
Arc coil L₁₁Chalk to prevent smoke from
Coil L₁₁Temperature when the winding temperature is detected and the power supply is cut off.
Current fuse that blows due to fuse or abnormal current
It is provided in ballast A.

Therefore, in the present embodiment, even if the above-described AC power supply circuit is cut off due to the life of the copper-iron type ballast A and the high pressure discharge lamp LA is turned off, the turn-off detecting circuit 40 detects the high pressure discharge lamp LA. Turn-off is detected, and turn-off detection circuit 4
Since the switching element Q ₅₁ is turned on by the output of 0, even though the AC power source Vs is not a power failure, the output of the power failure detection circuit F of the comparator IC ₅₁ is from the high level to the low level, the AC power supply described above In the power failure circuit, the high-pressure discharge lamp LA is lit again and is kept lit.

[0075]

According to the first aspect of the present invention, there is provided a copper-iron type ballast having an inductance element and connected to an AC power supply, a first igniter connected to an output terminal of the ballast, and a first igniter. A high-pressure discharge lamp connected to the output end of the power supply, a charging circuit connected to an AC power supply for charging the battery, a power conversion circuit for supplying power for lighting the high-pressure discharge lamp using the battery as a power supply, and a power conversion circuit A second igniter connected between the power supply and the high-pressure discharge lamp, a power failure detection circuit for detecting a power failure of the AC power supply, and a ballast and the first igniter when the AC power supply is turned on based on an output of the power failure detection circuit. A first switching circuit that switches the high-pressure discharge lamp to be turned on via the power conversion circuit and the second igniter based on an output of the power failure detection circuit, based on an output of the power failure detection circuit. Be done And a second switching circuit that switches between high-pressure discharge lamps using a battery as a power source. This has the effect. As a result, it is possible to secure an illuminance that does not hinder the running of the vehicle even when the commercial power supply stops.

According to a second aspect of the present invention, in the first aspect, the power conversion circuit has a booster circuit for boosting the output voltage of the battery and at least a switching element and a choke coil and is connected to an output terminal of the booster circuit. And a current limiting circuit for supplying desired power to the high-pressure discharge lamp, so that the high-pressure discharge lamp can be stably turned on.

According to a third aspect of the present invention, in the second aspect of the present invention, since a filter circuit for removing high-frequency current is provided between the current limiting circuit and the second igniter, a phenomenon in which an arc fluctuates during lighting. Can be prevented,
There is an effect that the high-pressure discharge lamp can be more stably lit and maintained. According to a fourth aspect of the present invention, in the third aspect of the present invention, a polarity inverting circuit for inverting the polarity of the output of the filter circuit at a low frequency is provided between the filter circuit and the second igniter. Since the polarity of the supplied power is inverted at a low frequency, there is an effect that the life of the high pressure discharge lamp can be prevented from being shortened.

According to a fifth aspect of the present invention, in the first aspect of the invention, the first igniter and the second igniter are shared, so that the number of parts can be reduced, and miniaturization and cost reduction can be achieved. There is an effect that can be. Claim 6
According to the invention of claim 1, in the invention of claim 1, the first and second igniters generate a high-voltage pulse voltage large enough to instantaneously relight the high-pressure discharge lamp. This has the effect of being able to be re-lit.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the first switching circuit is provided between the ballast and the first igniter, and the second switching circuit is connected to the output of the power conversion circuit. Is provided between the control circuit that controls the power supply and the control power supply circuit that generates the power of the control circuit, so that a circuit including a battery, a power conversion circuit, a second igniter, and a high-pressure discharge lamp is provided.
There is an effect that a small-capacity switching element can be reliably operated at the time of a power failure.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, since there is provided a delay means for giving a delay time to the switching operation of the first switching circuit and the second switching circuit, both switching circuits are simultaneously closed or There is an effect that opening can be reliably prevented. According to a sixteenth aspect of the present invention, in the fifteenth aspect, the predetermined value of the output voltage of the booster circuit is set to a relatively large value until a predetermined time elapses after the AC power supply is cut off. Thereafter, since the value is set to a relatively small value, there is an effect that the startability of the high-pressure discharge lamp can be improved and the time until the rated output can be shortened.

According to a seventeenth aspect of the present invention, in the sixteenth aspect, the predetermined value of the output voltage of the booster circuit is a discharge voltage necessary for starting the high-pressure discharge lamp until a predetermined time has elapsed after the AC power supply failed. Since the voltage is set to be equal to or higher than the voltage between both ends of the lamp, and is set so as to gradually decrease at a voltage equal to or higher than the voltage between both ends of the discharge lamp necessary for maintaining lighting of the high-pressure discharge lamp after a predetermined time, the energy of the battery can be used effectively. This has the effect.

According to a nineteenth aspect of the present invention, in the eighteenth aspect of the present invention, the predetermined value of each of the output voltage and the output current of the current limiting circuit is appropriately changed in accordance with the elapsed time after the power supply of the AC power supply is cut off. This has the effect that the energy of the battery can be used effectively. According to a twentieth aspect of the present invention, a first power conversion circuit is connected to an AC power supply and supplies power for lighting the high pressure discharge lamp, and is connected between the first power conversion circuit and the high pressure discharge lamp. A first igniter, the high-pressure discharge lamp connected to an output terminal of the first igniter, a charging circuit connected to an AC power supply for charging a battery, and power for lighting the high-pressure discharge lamp using the battery as a power supply Power supply circuit, a second igniter connected between the second power conversion circuit and the high-pressure discharge lamp, a power failure detection circuit for detecting a power failure of the AC power supply, and a power failure detection circuit A first switching circuit that switches so that the high-pressure discharge lamp is turned on through the first power conversion circuit and the first igniter when the AC power is supplied based on the output of
Based on the output of the power failure detection circuit, the second
Power conversion circuit and a second switching circuit that switches the high-pressure discharge lamp to be turned on via a second igniter, so that even if a commercial power supply fails due to a tunnel without an emergency power supply, etc. In addition, there is an effect that the high pressure discharge lamp can be instantaneously relighted and maintained to be lit by using the battery as a power source. As a result, it is possible to secure an illuminance that does not hinder the running of the vehicle even when the commercial power supply stops.

According to a twenty-first aspect of the present invention, in the twentieth aspect, each power conversion circuit has a booster circuit, at least a switching element and a choke coil, and supplies power for stably lighting the high-pressure discharge lamp. Since the power supply circuit includes the flow circuit, it is possible to supply electric power required for starting and maintaining the lighting of the high-pressure discharge lamp, so that the high-pressure discharge lamp can be stably maintained.

According to a twenty-second aspect of the present invention, in the twentieth aspect, the booster circuit of the first power conversion circuit and the booster circuit of the second power conversion circuit are shared, and based on the output of the power failure detection circuit. Since the step-up ratio of the step-up circuit is appropriately changed between the time when the AC power is supplied and the time when the power is interrupted, the number of parts can be reduced, and the size and cost of the device can be reduced.

According to a twenty-third aspect of the present invention, in the first or twentieth aspect, the first igniter generates a relatively low-voltage pulse voltage for starting the high-pressure discharge lamp, and the second igniter generates the high-voltage pulse voltage. Since the discharge lamp generates a relatively high pulse voltage that instantaneously relights, a relatively low voltage pulse voltage required for starting the high pressure discharge lamp is applied during normal power on / off when instantaneous relighting is not required except during a power failure. Therefore, there is an effect that the reliability and safety of parts can be improved.

According to a twenty-fourth aspect of the present invention, in accordance with the twenty-third aspect of the present invention, an extinguishing detection circuit is provided for detecting the extinguishing of the high-pressure discharge lamp when the AC power supply is energized. Since the second igniter is temporarily operated when the operation is performed, there is an effect that even if the high-pressure discharge lamp goes out, the second igniter can be instantaneously turned on again by the output of the second igniter.

According to a twenty-fifth aspect, in the first aspect, a dimming signal input circuit to which a dimming signal is input is provided,
When a dimming signal is input to the dimming signal input circuit, the first switching circuit is opened based on the output of the dimming signal input circuit and the second switching circuit is opened.
Is closed and the output of the second power conversion circuit is controlled, so that there is an effect that a dimming function can be provided with a simple configuration.

According to a twenty-sixth aspect of the present invention, in the first aspect of the present invention, there is provided an extinguishing detection circuit for detecting the extinguishing of the high-pressure discharge lamp when the AC power is supplied, and the extinguishing detection circuit detects the extinguishing of the high-pressure discharge lamp. Sometimes, the first switching circuit is opened and the second switching circuit is closed, so that even if the high-pressure discharge lamp goes out for some reason, there is an effect that the high-pressure discharge lamp can be turned on again and maintained.

[Brief description of the drawings]

FIG. 1 is a circuit block diagram showing a first embodiment.

FIG. 2 is a circuit diagram of the same.

FIG. 3 is a circuit diagram showing a second embodiment.

FIG. 4 is a circuit diagram showing a third embodiment.

FIG. 5 is a circuit diagram showing a fourth embodiment.

FIG. 6 is a circuit diagram showing a specific example of part of the above.

FIG. 7 is a circuit diagram showing a fifth embodiment.

FIG. 8 is a circuit diagram showing a sixth embodiment.

FIG. 9 is a circuit diagram showing a seventh embodiment.

FIG. 10 is a circuit diagram showing an eighth embodiment.

FIG. 11 is an operation explanatory diagram of the above.

FIG. 12 is a circuit diagram showing a ninth embodiment;

FIG. 13 is a circuit diagram showing a tenth embodiment.

FIG. 14 is a circuit diagram showing an eleventh embodiment.

FIG. 15 is an operation explanatory diagram of the twelfth embodiment.

FIG. 16 is a circuit diagram showing a thirteenth embodiment.

FIG. 17 is an operation explanatory view of the above.

FIG. 18 is a circuit diagram showing a fourteenth embodiment.

FIG. 19 is a circuit diagram showing a fifteenth embodiment;

FIG. 20 is a circuit diagram showing a sixteenth embodiment.

FIG. 21 is a circuit diagram showing a seventeenth embodiment.

FIG. 22 is a circuit diagram showing an eighteenth embodiment.

FIG. 23 is a circuit diagram showing a nineteenth embodiment.

FIG. 24 is a circuit diagram showing a conventional example.

[Explanation of symbols]

Vs AC power source V ₂ cell A copper iron ballast B power conversion circuit E charging circuit F power failure detection circuit IG _1, IG ₂ igniter LA pressure discharge lamp X _1, X ₂ switching circuit

Claims (26)

[Claims] 1. A ballast of an iron type having an inductance element and connected to an AC power supply, a first igniter connected to an output terminal of the ballast, and connected to an output terminal of the first igniter. A high-pressure discharge lamp, a charging circuit connected to an AC power supply for charging the battery, a power conversion circuit for supplying power for lighting the high-pressure discharge lamp using the battery as a power supply, and a power conversion circuit and the high-pressure discharge lamp. A second igniter connected to the power supply, a power failure detection circuit for detecting a power failure of the AC power supply, and the high-pressure discharge lamp via the ballast and the first igniter when the AC power supply is turned on based on the output of the power failure detection circuit. A first switching circuit that switches to be turned on, and a second switching circuit that switches to turn on the high-pressure discharge lamp via the power conversion circuit and the second igniter based on the output of the power failure detection circuit via a power conversion circuit and a second igniter when a power failure occurs in the AC power supply. And a switching circuit. 2. The power conversion circuit includes a booster circuit for boosting an output voltage of a battery, and has at least a switching element and a choke coil, and is connected to an output terminal of the booster circuit to supply desired power to the high-pressure discharge lamp. The discharge lamp lighting device according to claim 1, comprising a current limiting circuit. 3. Between the current limiting circuit and a second igniter,
3. The discharge lamp lighting device according to claim 2, further comprising a filter circuit for removing high-frequency current. 4. The discharge lamp lighting device according to claim 3, wherein a polarity inversion circuit for inverting the polarity of the output of the filter circuit at a low frequency is provided between the filter circuit and the second igniter. 5. The discharge lamp lighting device according to claim 1, wherein the first igniter and the second igniter are shared. 6. The discharge lamp lighting device according to claim 1, wherein the first and second igniters generate a high-voltage pulse voltage large enough to instantly relight the high-pressure discharge lamp. . 7. The first switching circuit is provided between the ballast and the first igniter, and the second switching circuit generates a control circuit for controlling an output of the power conversion circuit and a power supply for the control circuit. 2. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device is provided between the discharge lamp and the control power supply circuit. 8. The discharge lamp lighting device according to claim 7, further comprising delay means for giving a delay time to the switching operation of the first switching circuit and the second switching circuit. 9. The delay means closes the second switching circuit after opening the first switching circuit when a power failure of the AC power supply is detected by the power failure detection circuit, and switches the second switching circuit when the AC power supply is restored. 9. The discharge lamp lighting device according to claim 8, wherein the first switching circuit is closed after the switching circuit is opened. 10. The discharge lamp lighting device according to claim 2, wherein the booster circuit has a switching element and means for controlling the switching element so that an output voltage of the booster circuit becomes a predetermined value. . 11. A step-up circuit comprising: a transformer having a primary side and a secondary side wound in reverse; said switching element connected in series to a primary winding of the transformer; and an anode side connected in series to a secondary winding of the transformer. 11. The discharge lamp lighting device according to claim 10, wherein the discharge lamp lighting device is a flyback type booster circuit having a diode connected and a capacitor connected in parallel to a series circuit of the secondary winding and the diode. 12. A step-up circuit comprising: a transformer having a primary side and a secondary side wound in a positive winding; the switching element connected in series to a primary winding of the transformer; and an anode connected in series to a secondary winding of the transformer. A first diode connected thereto, a second diode connected in anti-parallel to a series circuit of the secondary winding and the first diode, and a series of a choke coil and a capacitor connected in parallel to the second diode. The discharge lamp lighting device according to claim 10, wherein the discharge lamp lighting device is a forward booster circuit having a circuit. 13. The booster circuit is a chopper type booster circuit having a series circuit of a choke coil and a switching element, and a series circuit of a diode and a capacitor connected in parallel to the switching element. 10. The discharge lamp lighting device according to 10. 14. A predetermined value of the output voltage of the booster circuit is not less than a voltage across the discharge lamp necessary for starting the high pressure discharge lamp or not less than a voltage across the discharge lamp required to maintain lighting of the high pressure discharge lamp. The discharge lamp lighting device according to claim 10. 15. The discharge lamp lighting device according to claim 10, wherein the predetermined value of the output voltage of the step-up circuit is appropriately changed according to an elapsed time after a power failure of the AC power supply. 16. A predetermined value of the output voltage of the booster circuit is set to a relatively large value until a predetermined time elapses after the interruption of the AC power supply, and is set to a relatively small value after the predetermined time. The discharge lamp lighting device according to claim 15, comprising: 17. A predetermined value of the output voltage of the step-up circuit is set to be equal to or higher than a voltage across the discharge lamp required for starting the high-pressure discharge lamp until a predetermined time has elapsed after the AC power supply has been cut off. 17. The discharge lamp lighting device according to claim 16, wherein the discharge lamp lighting device is set so as to gradually decrease at a voltage equal to or higher than a voltage between both ends of the discharge lamp necessary for maintaining lighting of the high pressure discharge lamp. 18. The current limiting circuit includes means for controlling a switching element of the current limiting circuit such that an output voltage or an output current of the current limiting circuit has a predetermined value. The discharge lamp lighting device as described in the above. 19. The system according to claim 18, wherein the predetermined value of each of the output voltage and the output current of the current limiting circuit is appropriately changed according to an elapsed time after a power failure of the AC power supply.
The discharge lamp lighting device as described in the above. 20. A first power conversion circuit which is connected to an AC power supply and supplies power for lighting a high pressure discharge lamp;
A first igniter connected between the power conversion circuit and the high-pressure discharge lamp, a high-pressure discharge lamp connected to an output terminal of the first igniter, and a charging circuit connected to an AC power supply to charge the battery A second power conversion circuit that supplies power for lighting the high-pressure discharge lamp using a battery as a power supply, and a second igniter connected between the second power conversion circuit and the high-pressure discharge lamp. A power failure detection circuit for detecting a power failure of the AC power supply, and the high pressure discharge lamp is turned on via the first power conversion circuit and the first igniter when the AC power supply is energized based on the output of the power failure detection circuit. A first switching circuit for switching, and a second switching circuit for switching on the high-pressure discharge lamp via the second power conversion circuit and the second igniter based on an output of the power failure detection circuit through a second power conversion circuit and a second igniter.
And a switching circuit. 21. Each power conversion circuit comprises a booster circuit and a current limiting circuit having at least a switching element and a choke coil and supplying power for stably lighting the high-pressure discharge lamp. 20. The discharge lamp lighting device according to 20. 22. The booster circuit of the first power conversion circuit and the booster circuit of the second power conversion circuit are shared, and the booster circuit is used when the AC power is supplied and when the power failure occurs based on the output of the power failure detection circuit. 3. The method according to claim 2, wherein the step-up ratio is changed appropriately.
2. The discharge lamp lighting device according to 1. 23. A first igniter generates a relatively low-voltage pulse voltage for starting the high-pressure discharge lamp, and a second igniter generates a relatively high-voltage pulse voltage for restarting the high-pressure discharge lamp instantaneously. 21. The discharge lamp lighting device according to claim 1 or claim 20. 24. An extinguishing detection circuit for detecting the extinguishing of the high-pressure discharge lamp when the AC power supply is energized, and temporarily operates the second igniter when the extinguishing detection circuit detects the extinguishing of the high-pressure discharge lamp. The discharge lamp lighting device according to claim 23, wherein the discharge lamp lighting device is operated. 25. A dimming signal input circuit to which a dimming signal is input is provided, and when a dimming signal is input to the dimming signal input circuit, the first switching circuit is activated based on an output of the dimming signal input circuit. The discharge lamp lighting device according to claim 1, wherein the output is opened and the second switching circuit is closed, and the output of the second power conversion circuit is controlled. 26. A light-off detection circuit for detecting the light-off of the high-pressure discharge lamp when the AC power supply is energized. When the light-off detection circuit detects light-off of the high-pressure discharge lamp, the first switching circuit is opened and the second switching circuit is opened. The discharge lamp lighting device according to claim 1, wherein the switching circuit is closed.