JP2001284084A - Discharge lamp lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device which can easily release latch up an IC is latched up by a faulty operation. SOLUTION: The discharge lamp lighting device illuminating all the times comprises a detecting circuit M1 and a reset circuit N1, where the detecting circuit M1, composed of resistors R3, R4, R5 connected to the output end of a filter circuit I, a comparator COMP1, a standard power source Verf 1 connected to the noninverting input end of the comparator COMP1, a resistor 6 and a light-emitting diode D4 connected to the output end of the comparator COMP1 detects the latch up of an IC A which is controlling a driving circuit F1, and the reset circuit N1, composed of a resistor R1 connected parallel to a capacitor C2, and a manual switch SW1, releases the latch up when the IC A is latched up and the manual switch SW1 is turned on, by reducing the power source voltage of the IC A until the latch up of the IC A is released.

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.

[0002]

2. Description of the Related Art Hitherto, low pressure sodium lamps have been the mainstream for tunnel lighting, and magnetic circuit type lighting devices have been the mainstream for lighting these lamps.

[0003] In a nighttime tunnel, so-called thinning-out lighting, in which a lamp is turned on at a certain interval, has been performed to save energy, but the road surface illuminance in the tunnel has been uneven to some extent.

However, recently, in order to enhance the safety in the tunnel, high-pressure sodium having a higher color rendering property and a high-frequency fluorescent lamp have been adopted.

[0005] In addition, a tunnel has been proposed which proposes a more uniform illumination even at night by employing an electronic lighting device using a semiconductor element or the like which enables continuous dimming control.

[0006]

An electronic lighting device uses a much larger number of elements than a magnetic circuit lighting device, and performs complicated control, so ICs are often used.

[0007] Generally, ICs are susceptible to noise.
Various devices have been devised so as not to malfunction even with noise in the lighting device or external noise.

However, under the influence of hyper radio which generates very strong noise, IC malfunctions and sometimes I
C may latch up and the lamp may go out.

Further, once latch-up occurs in the IC, it is not released as long as control power is supplied to the IC. In a normal lighting device, the control power is supplied if the main power is supplied to the lighting device. In this case, a method of temporarily turning off the main power to release the latch-up and turning on the main power again is adopted.

[0010] However, in the case of a device having a collective power supply such as tunnel lighting, all the lighting devices connected to the power supply are turned off once, which is very dangerous for a car running in a tunnel.

If a switch capable of cutting off the main power supply is provided inside each lighting fixture, a large-capacity switch is required to cut off the main current, which is disadvantageous in both size and cost.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a discharge lamp lighting device capable of easily releasing latch-up when an IC is latched-up due to malfunction.

[0013]

According to the first aspect of the present invention, there is provided a discharge lamp lighting device which is always lit using an electronic lighting circuit for 24 hours to achieve the above object. Latches up, the IC
Reset means for releasing the latch-up of the IC, wherein the latch-up of the IC is released by the reset means when the IC is latched up. According to this configuration, when the IC is latched up due to a malfunction, the latchup can be released by the reset means and the discharge lamp can be turned on again.

According to a second aspect of the present invention, in the first aspect, the reset means is a manual switch, and when the IC is latched up due to a malfunction,
Latch-up can be released arbitrarily and the discharge lamp can be turned on again.

According to a third aspect of the present invention, in the second aspect of the present invention, the manual switch is also used as an operation switch for flashing control of lighting of the discharge lamp. In addition, it is possible to control the flashing of the lighting of the discharge lamp without providing a switch for turning off the main power supply.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the reset means sets the power supply voltage of the IC to the I level.
C to a voltage at which latch-up of C is released
2. The method according to claim 1, wherein the latch-up of C is released.
The same effect can be obtained.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a latch-up detecting means for detecting a latch-up of the IC is provided. Can be detected.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the reset means performs a reset operation in accordance with a latch-up detection result of a latch-up detection means for detecting a latch-up of the IC. Even if the discharge lamp is turned off due to the latch-up of the IC, the discharge lamp can be turned on again by automatically releasing the latch-up of the IC.

According to a seventh aspect of the present invention, in the fifth or sixth aspect, the latch-up detecting means detects that the IC has latched up by detecting a decrease in the supply voltage to the discharge lamp. The latch-up of the IC can be detected.

According to an eighth aspect of the present invention, in the fifth or sixth aspect of the present invention, the latch-up detecting means outputs a notification signal when detecting that the IC has latched up. You can be notified that it has been uploaded.

[0021]

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

(Embodiment 1) FIG. 1 is a circuit diagram of the first embodiment, in which a pulsating voltage that has been subjected to full-wave rectification by a rectifier circuit DB from an AC power supply Vs is converted into a DC voltage by a power converter B. The polarity of the DC output voltage of the power conversion unit B is alternately inverted by a polarity inversion circuit J to output an alternating current, thereby supplying lighting power to the discharge lamp LA.

The power converter B includes a booster circuit G for boosting the full-wave rectified pulsating voltage from the rectifier circuit DB, and a booster circuit G
, A current limiting circuit H whose output is controlled by a control signal input from a control circuit K1, and a filter circuit I which smoothes the DC output of the current limiting circuit H.
And

The booster circuit G includes a choke coil L1 with a secondary winding, an FET Q1, a diode D1, and an FET Q1.
And a step-up chopper circuit composed of a drive circuit F3 for performing on / off control of the power supply. The drive circuit F3 controls on / off of the FET Q1 so that a predetermined DC output voltage boosted across the both ends of the smoothing capacitor C1 is obtained.

The smoothing capacitor C1 is connected to a FET Q via a diode D1 to smooth the output voltage of the booster circuit G.
1 in parallel.

The current limiting circuit H includes an FET Q2, a diode D
2, a step-down chopper circuit composed of a choke coil L2 and a drive circuit F1 for controlling on / off of the FET Q2. The drive circuit F1 controls the DC output of the current limiting circuit H by controlling on / off of the FET Q2 according to a control signal from the control circuit K1.

The filter circuit I includes a capacitor C3, a choke coil L3, and the like. The capacitor C3 is
The choke coil L3 is connected in parallel with the output terminal of the current limiting circuit H, and the choke coil L3 is connected in series with the choke coil L2 to form a low-pass filter for suppressing the harmonic current content of the output current of the current limiting circuit H to a predetermined value. I do.

The polarity inversion circuit J includes FETs Q3, Q4, Q
5, Q6 and a drive circuit F2. FETQ
3, Q4, Q5, Q6 are connected to a full bridge, and a pair of switching elements Q3, Q6 and Q4, Q5 are turned on / off alternately at a constant repetition frequency by a drive signal from a drive circuit F2. The alternating voltage is output by alternately inverting the polarity of the DC output voltage of the power conversion unit B, and alternating power having a frequency suitable for the discharge lamp LA is supplied.

The control circuit K1 is composed of an electronic circuit such as an ICA for controlling the drive circuit F1 of the FET Q2.

The control power supply circuit P includes a resistor R2, a diode D3, a capacitor C2, and a choke coil L with a secondary winding.
1 secondary winding. Power is supplied from the booster circuit G by the secondary winding of the choke coil L1 with the secondary winding, and the voltage across the capacitor C2 charged via the resistor R2 and the diode D3 is supplied to the control circuit K1 as control power. Is done. Of course, the control power source is the control circuit K1.
The power supply of the ICA included in the above.

The reset circuit N1 is composed of a series circuit of a resistor R1 connected in parallel with a capacitor C2 and a manual switch SW1 such as a self-return type push button switch.
It constitutes reset means for releasing the latch-up of the ICA.

The detection circuit M1 includes resistors R3, R4, R5 connected to the output terminal of the filter circuit I, and a comparator CO.
MP1, a reference voltage source Vref1 connected to the non-inverting input terminal of the comparator COMP1, and the comparator COMP
1 and a resistor R6 and a light emitting diode D4
, And constitutes latch-up detecting means for detecting that the IC has latched up.

Next, the operation of the first embodiment will be described.

First, the drive circuit F in the control circuit K1
When the ICA controlling the latch circuit 1 latches up for some reason, the FET Q2 is turned off, the lighting power of the discharge lamp LA is not supplied, the output voltage V1 of the filter circuit I decreases, and the discharge lamp LA is turned off. Filter circuit I
As the output voltage V1 of the detection circuit M1 decreases,
3, when the voltage V2 of the inverting input of the comparator COMP1 divided by R4 and R5 becomes lower than the voltage of the reference voltage source Vref1 input to the non-inverting input of the comparator COMP1, the output of the comparator COMP1 becomes H level. The H level output becomes the notification signal, and the light emitting diode D4 is turned on.

When the manual switch SW1 is turned on after confirming that the light emitting diode D4 is turned on, the electric charge stored in the capacitor C2 which supplies the control power to the control circuit K1 is discharged through the resistor R1, and both ends of the capacitor C2 are discharged. When the manual switch SW1 is turned off again when the voltage of the CAM drops below the voltage for resetting the latched-up ICA, the capacitor C2 is charged and the control power is supplied to the control circuit K1, and the ICA releases the latch-up. Normal operation again, and the discharge lamp LA is turned on again. At this time, the resistance value of the resistor R1 is determined by the value of I which latches up the charge of the capacitor C2 while the manual switch SW1 is on.
The resistance is set to a value that allows sufficient discharge so that the voltage drops to the voltage at which CA is reset.

(Embodiment 2) FIG. 2 shows the circuit configuration of Embodiment 2; however, the basic configuration is substantially the same as that of Embodiment 1, and the manual switch SW1 and the resistor R1 in Embodiment 1 are connected to each other. A reset circuit N2 composed of a transistor Q7 and a resistor R1.
In that the resistor R6 and the light emitting diode D4, which are the components of the detection circuit M1, are replaced by a detection circuit M2 in which a flip-flop T is replaced, and the output of the flip-flop T is connected to the base of the transistor Q7.
Since other configurations are the same as those of the first embodiment, the same components are denoted by the same reference numerals and description thereof will be omitted.

The reset circuit N2 comprises a series circuit of a resistor R1 and a transistor Q7 connected in parallel to a capacitor C2.

The detection circuit M2 includes resistors R3, R4, R5 connected to the output terminal of the filter circuit I, and a comparator CO.
MP1, a reference voltage source Vref1 connected to the non-inverting input terminal of the comparator COMP1, and the comparator COMP
1 is composed of a flip-flop T connected to the output terminal.

Next, the operation of the second embodiment will be described.

As in the first embodiment, when the ICA latches up, the output of the comparator COMP1 changes from the L level to the H level, and the flip-flop T to which this rising signal is input is a one-pulse H-level signal having a predetermined width. Is output. When this high-level pulse signal is input to the base of the transistor Q7 of the reset means N2, the transistor Q7 turns on, and the electric charge charged in the capacitor C2 that supplies the control power to the control circuit K1 is changed to the resistance R1 When the transistor Q7 turns off when the voltage across the capacitor C2 falls below the voltage for resetting the latched-up ICA, the first embodiment
Similarly, the latched-up ICA is reset and operates normally again, and the discharge lamp LA is turned on again.

(Embodiment 3) FIG. 3 is a circuit block diagram of Embodiment 3 in which a pulsating voltage that has been full-wave rectified by a rectifier circuit DB from an AC power supply Vs is supplied with a booster circuit G and a smoothing capacitor C.
1. The power is converted into a predetermined DC output by a power conversion unit B including a current limiting circuit H, and the polarity inversion circuit J passes through a filter circuit I that suppresses the harmonic current content of the output of the power conversion unit B to a predetermined value. The alternating current is output by inverting the polarity of the voltage, and the discharge lamp L
A is supplied with lighting power. 1, 2, and 3 can be considered to have the same circuit configuration at the same circuit reference numeral, and thus the detailed circuit configuration of FIG. 3 is referred to FIG. 1 and FIG. 2.

Further, a control circuit K1 including an electronic circuit such as an IC, including an ICA for controlling the current limiting circuit H to output a predetermined direct current, and outputting a power supply for the control circuit using the bus voltage of the booster circuit as an input. A control power supply circuit P, a capacitor C2 connected to both ends of the control power supply output of the control power supply circuit P,
The reset circuit N3 is configured by a series circuit of a resistor R1 connected in parallel with the capacitor C2 and a manual switch SW1 such as a self-return type push button switch.

The third embodiment does not include a latch-up detection circuit as in the first and second embodiments, and performs latch-up detection by turning off the high-pressure discharge lamp LA to simplify the circuit configuration. I have. If the ICA in the control circuit K1 is latched up for some reason and the high pressure discharge lamp LA is turned off, it is confirmed that the high pressure discharge lamp LA is turned off, and the manual switch SW1 is once turned on and turned off again. As in the first embodiment, the ICA is released from the latch-up and starts operating normally again, and the discharge lamp LA is turned on again.

(Embodiment 4) FIG. 4 shows the circuit configuration of the embodiment 4, but the basic configuration is substantially the same as that of the embodiment 3, and the manual switch SW1 and the resistor R1 in the embodiment 3 Is replaced by a reset circuit N4 including a switch SW2 capable of holding a state and a resistor R1. The other configuration is the same as that of the third embodiment, so that the same components are denoted by the same reference numerals and description thereof will be omitted.

When the switch SW2 is turned off, the control power is supplied from the control power circuit P via the capacitor C2 to the control circuit K.
1, the discharge lamp LA is turned on, and when the switch SW2 is turned on, the electric charge stored in the capacitor C2 which supplies the control power to the control circuit K1 is discharged through the resistor R1, and the electric charge is discharged across the capacitor C2. , The control power is no longer supplied to the control circuit K1, and the discharge lamp LA is turned off. Since the switch SW2 is a switch capable of holding the ON / OFF state, the ON / OFF state of the discharge lamp LA is held according to the ON / OFF state of the switch SW2.
Therefore, by turning on / off the switch SW2 even in the state where the AC power supply Vs is being input, it is possible to control the flashing of the lighting of the discharge lamp LA.

When the ICA is latched up and the discharge lamp is turned off, the latch-up can be released by turning on and off the switch SW2 as in the third embodiment.

[0047]

According to the first aspect of the present invention, in order to achieve the above object, in a discharge lamp lighting device that is always lit for 24 hours using an electronic lighting circuit, an IC used for controlling the electronic lighting circuit is latched up. And reset means for releasing latch-up of the IC when the IC is latched up. According to this configuration, when the IC is latched up due to a malfunction, there is an effect that the latchup is released by the reset means and the discharge lamp can be turned on again.

According to a second aspect of the present invention, in the first aspect, the reset means is a manual switch, and when the IC is latched up due to a malfunction,
There is the effect that the latch-up can be released arbitrarily and the discharge lamp can be turned on again.

According to a third aspect of the present invention, in the second aspect of the present invention, the manual switch is also used as an operation switch for flashing control of lighting of the discharge lamp. In addition, there is an effect that the flashing control of lighting of the discharge lamp can be performed without providing a switch for cutting off the main power supply.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the reset means sets the power supply voltage of the IC to the I level.
C to a voltage at which latch-up of C is released
2. The method according to claim 1, wherein the latch-up of C is released.
The same effect can be obtained.

According to a fifth aspect of the present invention, in any one of the first to fourth aspects of the present invention, a latch-up detecting means for detecting a latch-up of the IC is provided. There is an effect that it can be detected.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the reset means performs a reset operation in accordance with a latch-up detection result of a latch-up detecting means for detecting a latch-up of the IC. Even if the discharge lamp is turned off due to the latch-up of the IC, the discharge lamp can be turned on again by automatically releasing the latch-up of the IC.

According to a seventh aspect of the present invention, in the fifth or sixth aspect, the latch-up detecting means detects that the IC has latched up by detecting a decrease in the supply voltage to the discharge lamp. This has the effect that the latch-up of the IC can be detected.

According to an eighth aspect of the present invention, in the fifth or sixth aspect of the present invention, the latch-up detecting means outputs a notification signal when detecting that the IC has latched up. It has the effect of being able to report that it has been up.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing Embodiment 1 of the present invention.

FIG. 2 is a circuit diagram showing a second embodiment of the present invention.

FIG. 3 is a circuit diagram showing a third embodiment of the present invention.

FIG. 4 is a circuit diagram showing a fourth embodiment of the present invention.

[Explanation of symbols]

 B power converter DB rectifier circuit J polarity inversion circuit K1 control circuit LA discharge lamp M1 detection circuit N1 reset circuit

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Noriyuki Fukumori 1048 Kazuma Kadoma, Kadoma-shi, Osaka F-term in Matsushita Electric Works, Ltd. (reference) 3K072 AA11 BA05 CA16 EB05 GA03 GB03 GB18 GC04 HA02

Claims (8)

[Claims] 1. A discharge lamp lighting device which is always lit for 24 hours using an electronic lighting circuit, comprising reset means for releasing latch-up of an IC used for controlling the electronic lighting circuit when the IC is latched up. Discharge lamp lighting device characterized by the above-mentioned. 2. The discharge lamp lighting device according to claim 1, wherein said reset means is a manual switch. 3. The discharge lamp lighting device according to claim 2, wherein the manual switch is also used as an operation switch for flashing control of lighting of the discharge lamp. 4. The discharge lamp according to claim 1, wherein said reset means releases the latch-up of said IC by lowering a power supply voltage of said IC to a voltage at which said latch-up of said IC is released. Lighting device. 5. The discharge lamp lighting device according to claim 1, further comprising latch-up detecting means for detecting latch-up of said IC. 6. The discharge lamp lighting device according to claim 1, wherein said reset means performs a reset operation in accordance with a latch-up detection result of a latch-up detection means for detecting latch-up of said IC. 7. The discharge lamp according to claim 5, wherein the latch-up detecting means detects that the IC has latched up by detecting a decrease in a supply voltage to the discharge lamp. Lighting device. 8. The method according to claim 1, wherein the latch-up detecting means includes an IC.
7. The discharge lamp lighting device according to claim 5, wherein a notification signal is output when detecting that the battery has latched up.