JP2000091085A - Discharge lamp lighting device and pulse generating circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a discharge lamp lighting device capable of re-lighting a discharge lamp without operating cutting and reconnection of a power source in the case where the discharge lamp is extinguished by an instantaneous interruption of service or lowering of voltage. SOLUTION: This discharge lamp lighting device is provided with a ballast 1 for lighting a discharge lamp 8 and a timer 3a for operating a pulse device 2a for outputting the pulse for starting the discharge lamp 8 for the predetermined time. This discharge lamp lighting device is also provided with detecting circuits 7, D, R1, PC for detecting voltage rise to be generated between both electrodes of the discharge lamp 8 when the discharge lamp 8 is extinguished by the instantaneous interruption of service or lowering of voltage of a power source, and signal generating circuits R2, C, R3 for generating the signal for reset-starting the timer 3a. When the detecting circuits 7, D, R1, PC detect voltage rise generated between both the electrodes of the discharge lamp 8, the signal generating circuits R2, C, R3 generate the signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a ballast for lighting a discharge lamp, a pulse device for generating a pulse for starting the discharge lamp, and a timer for operating the pulse device for a predetermined time. And a pulse generation circuit useful for reset-starting the timer.

[0002]

2. Description of the Related Art In a discharge lamp, a high-pressure sodium lamp, a high-pressure mercury lamp and a metal halide lamp are sometimes collectively referred to as an HID lamp (High Intensity Discharge Lamp). These are small, high-output and high-efficiency lamps. , Characterized by long life. Among them, high pressure sodium lamps and metal halide lamps generally require a high pulse voltage to start the lamp.

FIG. 4 is a block diagram showing a configuration example of a conventional discharge lamp lighting device for lighting an HID lamp. The discharge lamp lighting device includes a ballast 1 for lighting the HID lamp 8, a pulse device 2 for generating a pulse for starting and lighting the HID lamp 8, a built-in pulse device 2, and A timer 3 for activating the time, one output terminal of the pulse device 2 is connected to a tap at an intermediate portion of the choke coil in the ballast 1, and the other output terminal is connected to the choke coil in the ballast 1. Of the ballast 1 and the HI
The pulse devices 2 are connected in parallel so that the D lamps 8 are in series.

In the discharge lamp lighting device having such a configuration, when the commercial power is turned on, the timer 3 is reset and started, and
Thereby, the pulse device 2 starts generating a pulse. The pulse generated by the pulse device 2 is boosted (in the order of several thousand volts) according to the turns ratio of the portion of the choke coil in the ballast 1 divided by the tap and the whole, and the HID lamp 8
Is turned on by the boosted high-voltage pulse. HI
While the D lamp 8 is lit, the voltage (lamp voltage) generated between the two electrodes decreases (several tens to hundreds of volts).

[0005] The HID lamp 8 is turned off by an instantaneous power failure (0.5 to several Hz) of the commercial power supply. In this case, the commercial power supply is temporarily cut off and reconnected, and the pulse device 2 is reset and activated. Otherwise, the HID lamp 8 cannot be turned on again. When the HID lamp 8 is turned on, the internal vapor pressure thereof becomes high. However, once the HID lamp 8 is turned off, the HID lamp 8 does not turn on while the internal vapor pressure is high even if commercial power is restored. Therefore, in such a case, in preparation for the case where the commercial power supply is cut off and reconnected, and the timer 3 is reset and started, an estimated time for the internal vapor pressure to decrease is anticipated, and the set time of the timer 3 (5 to 30 minutes) ), During which the pulse device 2
To generate a pulse.

[0006]

Recently, the use of high-pressure sodium lamps as a basic lighting part in tunnels has been increasing. However, when the power goes out in a tunnel due to a momentary power failure of a commercial power supply, an administrator notices the fact. And, as mentioned above,
Unless the commercial power supply is once cut off and reconnected, and the pulse device 2 is reset and started, there is a problem that the commercial power supply is left in a state of being turned off even though it is normal.

As a technique for solving this problem, a lamp current detecting circuit is provided, and when the lamp current detecting circuit detects the lamp current, the generation of the high voltage pulse is stopped and the timer circuit is reset to a reset state. An electric lamp lighting device is disclosed in Japanese Patent Application Laid-Open No. 10-27693. The power supply device further includes an operation power supply unit connected to the ballast, and a voltage detection unit connected in series to the operation power supply unit. When the voltage detection unit detects a voltage equal to or higher than a predetermined value, the operation power supply unit A discharge lamp lighting device for operating a timer circuit by supplying power and operating a high voltage pulse generating means is disclosed in
No. 41077.

The present invention has been made in view of the above-described circumstances. According to the first and second aspects of the present invention, when the discharge lamp is turned off due to an instantaneous power failure or voltage drop, the power supply is cut off and reconnected. An object of the present invention is to provide a discharge lamp lighting device that can be re-lit without need. In the third invention,
It is an object of the present invention to provide a pulse generation circuit useful for the discharge lamp lighting device according to the first and second inventions.

[0009]

According to a first aspect of the present invention, there is provided a discharge lamp lighting device for operating a ballast for lighting a discharge lamp and a pulse device for outputting a pulse for starting the discharge lamp for a predetermined time. A discharge lamp lighting device provided with a timer for detecting, when the discharge lamp is turned off due to an instantaneous power failure or voltage drop of a power supply, a detection circuit for detecting a voltage rise occurring between both electrodes of the discharge lamp; A signal generation circuit for generating a signal for reset-activating the timer, wherein the signal generation circuit generates the signal when the detection circuit detects the rise.

[0010] In this discharge lamp lighting device, when the discharge lamp is turned off due to an instantaneous power failure or voltage drop of the power supply, the detection circuit detects a voltage rise occurring between both electrodes of the discharge lamp.
The signal generation circuit generates a signal for reset-starting the timer when the detection circuit detects a voltage increase occurring between both electrodes of the discharge lamp. Thus, when the discharge lamp is turned off due to an instantaneous power failure or a voltage drop, the discharge lamp can be turned on again without the need to cut off and reconnect the power supply.

According to a second aspect of the present invention, in the discharge lamp lighting device, the signal generating circuit includes a capacitor and a first resistor, and a series circuit to which a predetermined voltage is applied, and a time constant larger than a time constant of the series circuit. And a second resistor connected in parallel to the capacitor to form a discharge circuit having the following formula: a voltage generated in the first resistor by a charging current to the capacitor when the predetermined voltage is applied. , And a signal for reset-activating the timer.

[0012] In this discharge lamp lighting device, the signal generating circuit is configured to form a second discharge circuit having a time constant larger than the time constant of the series circuit including the capacitor and the first resistor.
Are connected in parallel with the capacitor. Therefore, when a predetermined voltage is applied to the series circuit, a current (charging current) flows through the first resistor and the capacitor, and the voltage generated in the first resistor is used as a single-shot signal for reset-starting the timer. Can be generated as On the other hand, when the predetermined voltage is not applied to the series circuit, the electric charge in the capacitor is discharged by the second resistor.

[0013] With this configuration, the discharge lamp lighting device can reset the timer by a single signal, and can activate the pulse device for a predetermined time, so that the discharge lamp is turned off due to an instantaneous power failure or voltage drop. In this case, re-lighting can be performed without the need to cut off and reconnect power. Also, since the electric charge in the capacitor is discharged, after the discharge lamp is turned on and the predetermined voltage is no longer applied to the series circuit, after the time based on the time constant of the discharge circuit has elapsed, the predetermined circuit is again supplied to the series circuit. When a voltage is applied, a charging current flows, a voltage can be generated in the first resistor, a single signal can be generated, and a timer can be started by reset.

A pulse generating circuit according to a third aspect of the present invention includes a detecting circuit for detecting a voltage change to be detected, a series circuit including a capacitor and a first resistor, to which a predetermined voltage is to be applied, A second resistor connected in parallel to the capacitor so as to form a discharge circuit having a time constant larger than a constant, and when the detection circuit detects the voltage fluctuation, the predetermined voltage is applied to the series circuit. A voltage generated in the first resistor is generated as a pulse by a charging current supplied to the capacitor by the predetermined voltage.

In this pulse generation circuit, a second resistor is connected in parallel with the capacitor so as to form a discharge circuit having a time constant larger than the time constant of the series circuit including the capacitor and the first resistor. Therefore, when a predetermined voltage is applied to the series circuit, a current (charging current) flows through the first resistor and the capacitor, and the voltage generated at the first resistor can be generated as a single pulse. On the other hand, when the predetermined voltage is not applied to the series circuit, the electric charge in the capacitor is discharged by the second resistor.

Thus, the pulse generation circuit can start the timer by resetting, and discharges the electric charge in the capacitor, so that the time constant of the discharge circuit is reduced after the predetermined voltage is no longer applied to the series circuit. After a lapse of time based on the above, when a predetermined voltage is applied to the series circuit again, a charging current flows, a voltage is generated in the first resistor, and a pulse can be generated. It is useful for the discharge lamp lighting device according to the invention.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below.
This will be described with reference to the drawings showing the above. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of an embodiment of a discharge lamp lighting device and a pulse generation circuit according to the present invention. The discharge lamp lighting device and the pulse generation circuit
HID lamp 8 (High Intensity Dischar
ge Lamp: ballast 1 for lighting a high-intensity discharge lamp
A pulse device 2a for generating a pulse for starting and lighting the HID lamp 8, a pulse device 2a built in the pulse device 2a,
A timer 3a for operating the pulse device 2a for a predetermined time.

One output terminal of the pulse device 2a is connected to a tap at an intermediate portion of a choke coil in the ballast 1,
The other output terminal is connected to one end of a choke coil in the ballast 1 and is connected to a commercial power supply by the ballast 1 and the H.
An ID lamp 8 is connected in series, and a pulse device 2a is connected in parallel.

The discharge lamp lighting device and the pulse generation circuit are connected to the HID lamp 8 and the ballast 1 at the connection point.
SS7 (Silcon Symmetrical Switch; Sidac, Diac); diode D having an anode connected to SSS7; resistor R1 having one terminal connected to the cathode of diode D; and anode connected to the other terminal of resistor R1. The cathode is the HID lamp 8 and the pulse device 2a
A light emitting diode LD connected to a connection point with a terminal not connected to the ballast 1 and a phototransistor PT forming a light emitting diode LD and a photocoupler PC.

The breakover voltage of SSS7 is HID
The voltage is set to be larger than the lamp voltage of the lamp 8 × 1.41 V and smaller than the secondary-side no-load voltage of the ballast 1 × 1.41 V. SSS7, diode D, resistor R1, and photocoupler PC constitute a detection circuit. The diode D
The voltage applied to the light emitting diode LD is limited in one direction to prevent damage, and the resistor R1 limits the current flowing through the light emitting diode LD to prevent damage.

The discharge lamp lighting device and the pulse generating circuit further include a resistor R2 (first resistor) having one terminal connected to the positive lead wire 6 of a power supply circuit (not shown) of the timer 3a, and a resistor R2. A capacitor C having one terminal connected to the other terminal and the collector of the phototransistor PT connected to the other terminal is provided, and the emitter of the phototransistor PT is connected to the negative lead line 5 (ground line) of the power supply circuit of the timer 3a. )It is connected to the.

The discharge lamp lighting device and the pulse generation circuit also include a resistor R3 (second resistor) so as to constitute a discharge circuit having a time constant sufficiently larger than that of a series circuit including the resistor R2 and the capacitor C. ) Is connected in parallel with the capacitor C, and the connection point of the resistor R2 and the capacitor C is connected to the reset start terminal 4 of the timer 3a. The time constant of the series circuit of the capacitor C and the resistor R3 is sufficiently larger than the cycle of the commercial power supply.

Hereinafter, the operation of the discharge lamp lighting device and the pulse generating circuit having such a configuration will be described. When the commercial power is turned on, the discharge lamp lighting device and the pulse generation circuit
The SSS 7 repeats on / off in synchronization with the commercial power supply by the voltage between both ends of the HID lamp 8 which is turned off, whereby the photocoupler PC repeats on / off. When the photocoupler PC is turned on once, the voltage of the power supply circuit of the timer 3a is applied to the series circuit including the resistor R2 and the capacitor C, and the capacitor C is charged.

At this time, the charging current to the capacitor C flows for a moment, and as shown in FIG. 2A, the voltage drop reaching approximately 0 V (the potential of the negative electrode side lead wire 5) at the connection point between the resistor R2 and the capacitor C. Occurs. This becomes a reset pulse, the timer 3a is reset activated, and the pulse device 2a starts to generate a pulse. (Since the timer 3a has already been activated when the commercial power is turned on, it is activated again. ). The charging current flows to the capacitor C, and once the capacitor C is charged, the capacitor C and the resistor R
3 is sufficiently larger than the cycle of the commercial power supply and the discharge current is small. Therefore, even if the photocoupler PC repeats on / off in synchronization with the commercial power supply, the capacitor C
A sufficiently large charging current does not flow. Therefore,
The timer 3a is not restarted.

The pulse generated by the pulse device 2a is boosted (in the order of several thousand volts) in accordance with the turns ratio of the portion of the choke coil in the ballast 1 divided by the tap and the whole.
The HID lamp 8 is turned on by the boosted high-voltage pulse. While the HID lamp 8 is turned on, the voltage (lamp voltage) generated between the two electrodes decreases (several tens to hundreds of volts).

When the HID lamp 8 is not turned on, the voltage generated between the two electrodes does not decrease and the photocoupler PC repeats on / off. However, as described above, a sufficiently large charging current to the capacitor C flows. Since there is no timer 3a
Is not started again, and when the set time elapses, the pulse device 2a stops.

When the HID lamp 8 is turned on and the voltage generated between the two electrodes decreases, the SSS 7 does not turn on,
As a result, the photocoupler PC does not turn on. When the photocoupler PC is turned off, the voltage of the power supply circuit of the timer 3a is not applied to the series circuit including the resistor R2 and the capacitor C, and the charge charged in the capacitor C is discharged through the resistor R3. This discharge is shown in FIG.
This is performed according to a sufficiently large time constant, as shown in FIG.

When the HID lamp 8 is turned on, its internal vapor pressure becomes high. However, once it is turned off, it does not turn on while the internal vapor pressure is high. Therefore, when the HID lamp 8 is turned off, the time when the internal steam is cooled and the internal steam pressure is reduced is estimated in preparation for the case where the commercial power supply is cut off and reconnected and the timer 3a is reset and started. 3 Set time (5 to 30 minutes) (predetermined time)
During that time, a pulse is generated by the pulse device 2a.

When the HID lamp 8 is turned off due to an instantaneous power failure or voltage drop of the commercial power supply when the discharge from the capacitor C is not sufficient, the timer 3a is reset even if the photocoupler PC is repeatedly turned on / off. Not done. However, at that time, the timer 3a is set to the pulse device 2a.
Is operated, and the operation time of the pulse device 2a remains longer than the time required for cooling the internal vapor of the HID lamp 8, and the HID lamp 8 can be turned on again.

When the discharge from the capacitor C is sufficient and the timer 3a can be reset and activated by the charging current, the HID lamp 8 is turned off due to an instantaneous power failure of the commercial power supply, a voltage drop, or the like. At this time, the secondary side of the ballast 1 is in a no-load state,
The voltage across the ID lamp 8 rises as a no-load voltage,
Accordingly, the voltage across the SSS 7 also increases. as a result,
As shown in FIG. 3A, the SSS is synchronized with the commercial power supply.
7 repeats the on / off operation, whereby the photocoupler P
C repeats on / off.

The absence of each end of the waveform shown in FIG. 3A indicates a period during which the SSS 7 is on (conducting). When the photocoupler PC is turned on once, the timer 3a is connected to the series circuit including the resistor R2 and the capacitor C.
Is applied, and the capacitor C is charged.

At this time, the charging current to the capacitor C flows for a moment, and as shown in FIG. 3B, a voltage drop reaches approximately 0 V (the potential of the negative electrode side lead wire 5) across the resistor R2. This becomes a reset pulse, and the timer 3a is reset and started, regardless of whether the timer 3a is operating or stopped, and the pulse device 2a starts to generate a pulse.

When the charging current flows to the capacitor C and the capacitor C is charged once, the time constant of the capacitor C and the resistor R3 is sufficiently larger than the cycle of the commercial power supply, and the discharging current is small. Even if the on / off operation is repeated in synchronization with the commercial power supply, a sufficiently large charging current to the capacitor C does not flow. Therefore, timer 3
a is not activated again.

The pulse generated by the pulse device 2a is boosted (in the order of several thousand volts) in accordance with the turns ratio of the portion of the choke coil in the ballast 1 divided by the tap and the whole,
The HID lamp 8 is turned on by the boosted high-voltage pulse. While the HID lamp 8 is turned on, the voltage (lamp voltage) generated between the two electrodes decreases (several tens to hundreds of volts).

When the voltage generated between both electrodes of the HID lamp 8 decreases, the SSS 7 does not turn on, and the photocoupler PC does not turn on. When the photocoupler PC is turned off, the voltage of the power supply circuit of the timer 3a is not applied to the series circuit including the resistor R2 and the capacitor C, and the electric charge charged in the capacitor C is reduced to the resistance R3
Is discharged through. This discharge is performed according to a sufficiently large time constant, as shown in FIG.

As described above, once turned off, the HID lamp 8 does not turn on while the internal vapor pressure is high.
Therefore, the time when the internal steam is cooled and the internal steam pressure is reduced is estimated, and the timer 3 causes the pulse device 2a to generate a pulse for a set time (5 to 30 minutes) (predetermined time).
In addition, the above-described pulse generation circuit is not limited to the above-described discharge lamp lighting device, and may be any device that requires a single pulse.
Can be used.

[0037]

According to the discharge lamp lighting device according to the first aspect of the present invention, when the discharge lamp is turned off due to an instantaneous power failure or voltage drop, the discharge lamp can be relighted without the need to cut off and reconnect the power supply. Become.

According to the discharge lamp lighting device of the second invention,
With a single signal, the timer can be reset and started, and the pulse device can be operated for a predetermined time, so if the discharge lamp is turned off due to an instantaneous power failure or voltage drop, the power supply needs to be shut off and reconnected. Re-lighting is possible without the need. Also, since the electric charge in the capacitor is discharged, after the discharge lamp is turned on and the predetermined voltage is no longer applied to the series circuit, after the time based on the time constant of the discharge circuit has elapsed, the predetermined circuit is again supplied to the series circuit. When a voltage is applied, a charging current flows, a voltage can be generated in the first resistor, a single signal can be generated, and a timer can be started by reset.

According to the pulse generation circuit of the third invention,
The timer can be reset and started, and the charge in the capacitor is discharged.After a predetermined voltage is no longer applied to the series circuit, after the time based on the time constant of the discharge circuit has passed, the timer is connected to the series circuit. When a predetermined voltage is applied again, a charging current flows, causing a voltage to be generated in the first resistor and being generated as a pulse.
It is useful for the discharge lamp lighting device according to the invention.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a discharge lamp lighting device and a pulse generation circuit according to the present invention.

FIG. 2 is a waveform diagram for explaining operations of the discharge lamp lighting device and the pulse generation circuit according to the present invention.

FIG. 3 is a waveform chart for explaining operations of the discharge lamp lighting device and the pulse generation circuit according to the present invention.

FIG. 4 is a block diagram showing a configuration example of a conventional discharge lamp lighting device.

[Explanation of symbols]

 Reference Signs List 1 ballast 2a pulse device 3a timer 4 reset start terminal 7 SSS (detection circuit) 8 HID lamp (discharge lamp) C capacitor D diode (detection circuit) LD light emitting diode (detection circuit) PC photocoupler (detection circuit) PT phototransistor (Detection circuit) R1 resistance (detection circuit) R2 resistance (first resistance) R3 resistance (second resistance)

Claims (3)

[Claims] 1. A discharge lamp lighting device comprising: a ballast for lighting a discharge lamp; and a timer for operating a pulse device for outputting a pulse for starting the discharge lamp for a predetermined time. When the electric lamp is turned off due to an instantaneous power failure or voltage drop of the power supply, a detection circuit that detects a voltage increase that occurs between both electrodes of the discharge lamp, and a signal generation circuit that generates a signal for resetting and starting the timer. A discharge lamp lighting device, wherein the signal generation circuit generates the signal when the detection circuit detects the rise. 2. The signal generation circuit according to claim 1, wherein the signal generation circuit includes a capacitor and a first resistor, and forms a series circuit to which a predetermined voltage is to be applied and a discharge circuit having a time constant larger than a time constant of the series circuit. A second resistor connected in parallel to the capacitor, and a voltage generated in the first resistor by a charging current to the capacitor when the predetermined voltage is applied, for reset-starting the timer. 2. The discharge lamp lighting device according to claim 1, wherein the discharge lamp lighting device is used as a signal. 3. A series circuit comprising a detection circuit for detecting a voltage fluctuation to be detected, a capacitor and a first resistor, to which a predetermined voltage is to be applied, and a discharge having a time constant larger than the time constant of the series circuit. A second resistor connected in parallel with the capacitor to form a circuit, wherein the predetermined voltage is applied to the series circuit when the detection circuit detects the voltage fluctuation, A pulse generating circuit, wherein a voltage generated in a first resistor is generated as a pulse by a charging current to the capacitor.