JPH01154496A - Lighting device for discharge lamp - Google Patents

Abstract

PURPOSE:To make it possible to inform of the life of a discharge lamp without causing uncomfortable feeling by detecting an initial condition of the last stage in the life of a discharge lamp by means of a 1st detection circuit, causing a display lamp to light, detecting a terminal condition of the last stage in the life of the discharge lamp and keeping the discharged lamp to be turned off. CONSTITUTION:A 1st detection circuit 61a of a detection device 61 detects a stage of a low detected voltage of a detection coil 5, namely an initial condition of the last stage in the life of a discharge lamp 6 while a 2nd detection circuit 61b of the detection device of detects a high detected voltage of the detection coil 5, namely a terminal condition of the last stage in the life of the discharge lamp 6. An informing circuit 41 is actuated by receiving a trigger outputted at the time of detection by the 1st detection circuit 61a of the initial condition being reached in the last stage of the life of the discharge lamp 6 to light a display lamp 42. If the detected voltage in the detection coil 5 further increases as a result of continued lighting of the discharge lamp 6 and more intensified half-wave discharge phenomenon, the informing circuit receives a trigger output from the 2nd detection circuit 61b and causes the oscillation of an inverter lighting circuit to turn off the discharge lamp 6. This arrangement permits to inform of the last stage in the life of the discharge lamp without causing uncomfortable feeling.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a discharge lamp lighting device equipped with an inverter lighting circuit.

[Conventional technology]

Conventionally, in a discharge lamp lighting device equipped with an inverter lighting circuit, devices such as those shown in Figs. 3 and 4 are known as devices that detect and notify the end of the life of the discharge lamp. . As schematically shown in Fig. 3, a rectifier circuit 3 is connected to a commercial AC N source 1 via a wall switch 2, an inverter lighting circuit 4 is connected to the rectifier circuit 3, and a detection voltage is connected to the lighting circuit 4. 1i15, a discharge lamp 6 is connected to the output end of the lighting circuit 4, a detection circuit 7 is connected to the detection winding 5, and an oscillation stop circuit 8 is connected to the detection circuit 7. Inverter lighting circuit 4
includes an inverter lighting circuit 11 that converts a DC voltage into a high frequency voltage, a starting circuit 12 that starts this oscillation circuit 11, and a feedback circuit 13 that maintains the oscillation of the inverter oscillation circuit 11.

As shown in FIG. 4, the rectifier circuit 3 used as a DC power source is formed by a diode bridge circuit 9. Further, the inverter oscillation circuit 11 has NPN transistors 16 and 17 connected to both ends of a resonant circuit formed by connecting the primary winding 141 of a magnetic leakage type optical wave transformer 14 and a capacitor 15 in parallel. The secondary winding 145 of the oscillation transformer 14 is formed as an output end. The starting circuit 12 includes a base resistor 18 connected to the base of the transistor 16 and a transistor 17.
and a base starting resistor 20 connected between both of these resistors 18 and 19 and the positive terminal of the rectifier circuit 3. Feedback circuit 13
is the base of each transistor 16.17 and the base resistance 1
The base power supply circuit 22 consists of the base valley wire 21 of the excavation transformer 14 whose winding ends are respectively connected to the connection points with 8.19 and the base power supply circuit 22. A smoothing capacitor 25 is connected in parallel to the line 23 via a rectifying diode 24 with the illustrated polarity, and a resistor 26 is connected to the connection point between the diode 24 and the capacitor 25. The resistor 26 is connected to the connection point between the base resistances 18 and 19 and the base startup resistance 20 in the starting circuit 12, and the connection point between the feedback winding FA23 and the capacitor 25 is connected to the emitter of the transistor 16.

The inverter lighting circuit 4 having such a configuration is activated by being supplied with the output of the rectifier circuit 3 as a DC power source. Then, the primary winding 14F of the oscillation transformer 14
The current flowing through the base line 21 returns from the base line 21. In addition, a voltage whose phase and saturation line match the voltage of the negative winding 141'' is induced in the feedback @Ie23, and this voltage is rectified by the diode 24 and smoothed by the capacitor 25, so that the saturation line A waveform DC voltage is obtained, which is applied to the resistor 26.
18 to the base of transistor 16, and resistor 26.19 to the base of transistor 17. Therefore, transistor 16.1
7 repeats on and off alternately. Thereby, the DC voltage supplied from the rectifier circuit 3 is converted into a high frequency voltage,
The voltage is boosted and discharged to the secondary AI 14s of the oscillation transformer 14,
The discharge lamp 6 is turned on.

The detection winding 5 is provided on the secondary side of the oscillation transformer 14. The detection circuit 7 includes a rectifier circuit 27 formed of a diode bridge circuit that rectifies the detection output of the detection winding 5.
A resistor 28 and a capacitor 29 for smoothing the output are connected in parallel to the output terminal of the circuit, and a time constant circuit consisting of a resistor 30 and a capacitor 31 is connected in parallel to the capacitor 29.
A trigger circuit including a trigger element 32 and a resistor 33 is connected to a capacitor 31. For example, a Zener diode is used as the trigger element, but a two-terminal thyristor may also be used instead.

Further, the excavation stop circuit 8 is formed of an NPN type transistor. The base and emitter of this transistor 8 are connected through the resistor 33 of the trigger circuit, and the emitter is connected to the feedback winding 23 and the capacitor 2.
It is also connected to the connection point with 5. The collector of this transistor 8 is connected to the connection point between the base resistances 18 and 19 and the base starting resistor 20 in the starting circuit 12.

By the way, it is known that the half-wave discharge phenomenon becomes stronger when the discharge lamp 6 reaches the end of its life. When the discharge lamp 6 is in such a state, the secondary winding 14 of the oscillation transformer 14
3 is increased, and the induced voltage in the detection winding 5 is also increased in proportion to it. Then, the potential of the capacitor 31 of the time constant circuit becomes high, so when this potential exceeds the Zener voltage of the trigger element 32, the trigger element 32 becomes conductive and sends a trigger output to the base of the transistor forming the excavation stop circuit 8. give.

This turns on transistor 8, so
No base current flows through the transistors 16 and 17 of the inverter lighting circuit 4, the oscillation of the inverter oscillation circuit 11 stops, and the discharge lamp 6 goes out. at the same time,
By stopping the oscillation as described above, the output voltage of the detection winding 5 disappears. Therefore, the potential of the capacitor 31 of the time constant circuit decreases, causing the trigger element 32 to become non-conductive, so that the transistor 8 as a sales stop circuit is turned off. Then, the collector potential of this transistor 8 is restored, and the transistor 16.1 of the inverter oscillation circuit 11
A base current flows through the inverter oscillation circuit 11, and the inverter oscillation circuit 11 restarts oscillation, and the discharge lamp 6 is turned on.

Thereafter, by repeating the above operations, the discharge lamp 6 performs a blinking operation, thereby indicating the end of the life of the discharge lamp 6.

[Problem that the invention seeks to solve]

By the way, when using a discharge lamp in a place where it is not easy to replace it immediately, such as a high ceiling in a hall or the ceiling of a moving vehicle, there is no choice but to leave it as is, regardless of the above-mentioned lifespan notification. As described above, in the conventional lighting device, the discharge lamp 6 is blinked at the end of its life to notify the end of its life.
Since the flashing notification is left unattended, there is a problem in that it gives a very unpleasant feeling.

Conventionally, as shown in Japanese Patent Application Laid-Open No. 16329/1983, at the end of the life of a discharge lamp, the number of blinks is detected in the soil where the discharge lamp is blinked, and when a predetermined number is detected, an oscillation stop circuit is installed. to stop the excavation operation and control
There are also plans to make it so that it can be pulled out.

However, even in this conventional example, the flashing of the discharge lamp still signals the end of its lifespan. Therefore, if the flashing period is set for a long time, as already mentioned, it will cause a very unpleasant feeling, and the flashing will cause discomfort. If the period of time is short, there is a problem in that there are fewer opportunities to notify the end of the life of the discharge lamp.

Therefore, the present invention provides a discharge lamp lighting device that can notify the end of the discharge lamp's life even after the discharge lamp has been turned off without causing discomfort, and can prevent progression of the discharge lamp's life at the end of the life. It's about doing.

[Means for solving the problem 1-] As shown in FIG. 14S, a detection winding 5 is provided on the secondary side of the oscillation transformer 14, and a detection device 61 for detecting a half-wave discharge phenomenon that occurs at the end of the life of the discharge lamp 6 is connected to the detection winding. Connect to 5. The detection device 61 is formed of a first detection circuit 61a that detects the beginning of the end of the life of the discharge lamp 6, and a second detection circuit 61b that detects the end of the end of the life of the discharge lamp 6. Further, a notification circuit 41 is connected to the output terminal of the first detection circuit 61a, and a notification circuit 41 is connected to receive the trigger output of the detection circuit 61a to continue lighting the indicator lamp 42 that indicates the lifespan of the discharge lamp 6. The above conventional problems are solved by connecting an oscillation stop circuit 8 which receives the output of the detection circuit 61b and continues to stop the oscillation of the inverter lighting circuit 4 to the output terminal of the detection circuit 61b.

[Effect]

In the present invention, the detection winding 5 and the detection device 61 detect the life span of the discharge lamp 6 by detecting the voltage rise on the secondary side of the oscillation transformer 14 based on the half-wave discharge phenomenon of the discharge lamp 6. In particular, the first detection circuit 61a of the detection VT device 61 detects the stage when the detection voltage of the detection winding 5 is low, that is, the initial state at the end of the life of the discharge lamp 6, and the second detection circuit 61b of the detection device 61 detects Detection volume 1! A stage where the detection voltage of J5 is high, that is, a terminal state at the end of the life of the discharge lamp 6 is detected. In the notification circuit 41, the first detection circuit 61a is connected to the discharge lamp 6.
When it is detected that the device has reached the initial state at the end of its lifespan, it operates in response to an output trigger and lights up the indicator light 42. Even at the end of such a life, the discharge lamp 6 continues to be lit by half-wave discharge. Therefore, the discharge lamp 6
In the early hours of the lifespan of the discharge lamp 6, without blinking,
The lifespan can be notified by lighting the indicator light 6.

As the discharge lamp 6 continues to light, the half-wave discharge phenomenon becomes stronger and the detection voltage of the detection winding 5 further increases.
The second detection circuit 61b detects the end of the life of the comfort lamp 6. The oscillation stop circuit 8 is the second detection circuit 61b.
It operates upon receiving a trigger output from the inverter lighting circuit 4 to stop the oscillation of the inverter lighting circuit 4 and turn off the discharge lamp 6. Note that, although the output voltage of the detection winding 5 disappears when the discharge lamp 6 is turned off, both circuits 61a of the detection device 61
, 61b are not affected by the output voltage of the detection winding 5 once they are activated, so the notification circuit 41 keeps its indicator lamp 42 lit, and the oscillation stop circuit 8 Excavation is not restarted by maintaining the excavation stop state of the inverter lighting circuit 4.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In the description, the same components as those of the conventional technology described using FIGS. 3 and 4 will be given the same reference numerals, and the description thereof will be omitted, and only the different components will be described.

The detection device 61 connected to the detection winding 5 includes a first detection circuit 61a that detects the beginning of the end of the life of the discharge lamp 6, and a second detection circuit 61b that detects the end of the end of the life of the discharge lamp 6. It is formed.

In other words, the first detection circuit 61a is a rectifier circuit 6 made of a diode bridge circuit that rectifies the detection output of the detection winding 5.
2, a resistor 63 and a capacitor 6 to smooth this output.
4 in parallel and a resistor 64.4 connected in series.
65 are connected in parallel, and a time constant circuit is connected to the resistor 65 along with the resistor 64. A capacitor 66 is connected in parallel, and roughly consists of a first trigger element 67 and a resistor 68 directly connected to this capacitor 66. It is formed by connecting trigger circuits in parallel.

The second detection circuit 611) includes a rectification circuit 62 formed of a diode bridge circuit that rectifies the detection output of the detection winding 5.
A resistor 63 and a capacitor 64 for smoothing this output are connected in parallel, and a time constant circuit consisting of a resistor 69 and a capacitor 70 in series with the capacitor 64 is connected in parallel. A trigger circuit consisting of a resistor 72 and a resistor 72 connected in series is connected in parallel.

Above 1st. For example, a Zener diode is used for the second element 67, 71, but a two-terminal thyristor may be used instead. Then, there is the detection level of the second trigger element 71.

The notification circuit indicated by 41 in the figure lights up the indicator lamp 42 which indicates the life span of the discharge lamp 6 in response to the trigger output from the first detection circuit 61a. In other words, this circuit 41 is formed by connecting a series circuit of a resistor 43, an indicator light 42, and a thyristor 44 to a rectifier circuit 3 as a DC power source, and connects the gate of the thyristor 44 to the v81 detection circuit 61a.
It is connected to the connection point between the first trigger element 67 and the resistor 68 of the trigger circuit.

Further, the oscillation of the inverter lighting circuit 4 is stopped [i stop circuit 8 is formed of a thyristor in order to continue to stop the excavation of the lighting circuit 4 after its operation, and its gate is connected to the second detection circuit 61b. 2nd trigger circuit
The I reading points of the trigger element 71 and the resistor 72 are connected.

According to the discharge lamp lighting device including the detection device 61, the notification circuit 41, and the oscillation stop circuit (thyristor) 8 as described above, when the wall switch 2 is turned on, the inverter lighting circuit 4 is connected to the rectifier circuit 3. By providing an output, this lighting circuit 4 can be started, and the primary winding 14P of the oscillation transformer 14
The feedback of the current from the base winding 21 through the base power supply circuit 22 and the application of the DC voltage obtained by the base power supply circuit 22 to the transistors 16.17 cause these transistors 16.17 to be repeatedly turned on and off alternately. Thereby, the rectifier circuit 3
The DC voltage supplied from the oscillating transformer 14 is converted into a high-frequency voltage, and the voltage is boosted and discharged to the secondary winding 143 of the oscillation transformer 14, so that the discharge lamp 6 can be lit.

Then, when the tli electric light 6 reached the end of its life,
When the wave discharge phenomenon becomes stronger, the voltage of the secondary winding 143 of the oscillation transformer 14 increases, and the induced voltage of the detection winding $25 also increases in proportion to this, which is detected by the detection device 61. In other words, the potential of the capacitors 66 and 70 of the time constant circuit included in the first and second detection circuits 61a and 61b of the detection device 61 rises. and,
When the potential of the capacitor 66 exceeds the Zener voltage of the first trigger element 67, the first trigger element 67 is rendered conductive. That is, the initial state of the discharge lamp 6 at the end of its life is detected, and thereby the first detection circuit 61
a provides a trigger output to the gate of the thyristor 44 included in the notification circuit 41. In addition, at this stage, the capacitor 7o
The potential is lower than the Zener voltage of the second trigger terminal 71.

Then, the thyristor 44 becomes conductive, and after that, the thyristor 44 maintains the conductive state by its self-holding function. As described above, when the thyristor 44 becomes conductive, the DC output from the rectifier circuit 3 is supplied to the indicator lamp 42 via the resistor 43, so the indicator lamp 42 lights up and the discharge lamp 6 is in the initial state at the end of its life. Notify that this has been reached.

The predictive notification of the life of the discharge lamp 6 by the indicator lamp 42 is continued until the wall switch 2 is turned off by the self-holding function of the thyristor 44. Further, the trigger output of the detection device 61 at the above stage only starts the operation of the notification circuit 41 as described above, and does not control the generation operation of the inverter lighting circuit 4. The inverter oscillation circuit 11 continues to oscillate, and the discharge lamp 6 continues to be lit.

However, the end of the life of the discharge lamp 6 is not notified by blinking the discharge lamp 6 at the end of its life, but the notification circuit 41 predicts and informs the end of the life of the discharge lamp 6 by lighting the indicator light 420. Since the lighting device is configured to continue lighting, it is possible to notify the end of the life of the discharge lamp 6 without causing discomfort as a lighting device for the discharge lamp 6 used in a place where replacement cannot be performed immediately.

Then, as the discharge lamp 6 continues to be lit after the end of life notification as described above, the half-wave emission phenomenon becomes stronger and the detection voltage of the detection winding 5 further increases. Therefore, the potential of the capacitor 70 of the time constant circuit included in the second detection circuit 61b of the detection device 61 becomes even higher, and the second voltage eventually exceeds the Zener voltage of the element 71. Then, at that point, the second trigger cord 71 is made conductive, and the terminal state of the discharge lamp 6 at the end of its life is detected. Thereby, the trigger output of the second detection circuit 61b is given to the gate of the thyristor 8, which serves as an oscillation stop circuit. Therefore, the thyristor 8 becomes conductive, and after that, the thyristor 8 maintains the conductive state by its self-holding function. Due to this conduction, base current no longer flows to the transistors 16 and 17 of the inverter lighting circuit 4, and the inverter oscillation circuit 1
At the same time as the oscillation of 1 stops, the discharge lamp 6 goes out.

Therefore, since the discharge lamp 6 does not continue lighting indefinitely at the end of its life, problems caused by continuous lighting at the end of its life include unstable lighting, intermittent lighting, abnormal light emission, and tube end problems. There is no risk of blackening, 'iIi pole drop, excessive temperature rise of the inverter lighting circuit 4, etc.

Moreover, even after the discharge lamp 6 is turned off as described above, as long as the cypress switch 2 is turned on, the notification circuit 4
Since the lamp 1 continues the notification operation, the location of the discharge lamp 6 that has reached the end of its life can be easily identified by the notification, and its replacement can be facilitated.

Further, in order to release the notification state and the excavation stop state of the notification circuit 41, it is sufficient to open and close the wall switch 2, whereby the thyristors 44 and 8 become non-conductive, respectively.
The notification circuit 41 and the oscillation stop circuit 8 prepare for the next operation.

〔Effect of the invention〕

As explained above, the present invention detects the initial state of the discharge lamp at the end of its life using the detection winding and the first detection circuit of the detection device, lights up the indicator light included in the notification circuit, and continues the lighting thereafter. 11 due to this lighting, not a Cpu! i The discharge lamp is turned on regardless of the lamp life notification, and the detection winding and the second detection circuit of the detection device detect the terminal state at the end of the discharge lamp life, and the inverter lighting circuit is activated via the oscillation stop circuit. Since the excavation was stopped and the excavation stop was continued to keep the discharge lamps off, the flashing of the discharge lamps was used as a lighting device for discharge lamps used in pumping places where replacement cannot be done immediately. It is possible to notify the lifespan of a discharge lamp without causing discomfort due to the discharge lamp, and this notification can be maintained even after the discharge lamp is turned off, making it easier to identify discharge lamps that have reached the end of their lifespan and improving maintainability. Since the discharge lamp is not turned on continuously at the end of its life, it has the effect of preventing the discharge lamp from progressing to the end of its life.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the concept of the present invention, and FIG. 2 is an electric circuit diagram showing an embodiment of the present invention. FIG. 3 is a block diagram showing the concept of the conventional example, and FIG. 4 is an electric circuit diagram of the conventional example. 3... DC Ichihara (rectifier circuit), 4... Inverter lighting circuit, 5... Detection winding,
6...tll electric light, 8... oscillation stop circuit (thyristor), 14... oscillation transformer, 14s... secondary winding, 41... notification circuit, 42... indicator light, 61...・・・
Detection device, 61a...first detection circuit, 61b...second detection circuit. Figure 3 Figure 4

Claims (1)

[Claims] An inverter lighting circuit is connected to a DC power source, a discharge lamp is connected to a secondary winding of an oscillation transformer included in the lighting circuit, and a detection winding is provided on the secondary side of the oscillation transformer.
A detection device for detecting a half-wave discharge phenomenon that occurs at the end of the life of the discharge lamp is connected to the detection winding, and the detection device is connected to a first detection circuit that detects the beginning of the end of the life of the discharge lamp;
and a second detection circuit for detecting the end of the lifespan of the discharge lamp, and an indicator lamp is turned on at the output end of the first detection circuit to indicate the lifespan of the discharge lamp upon receiving a trigger output from the detection circuit. Discharge lamp lighting characterized in that an oscillation stop circuit is connected to the output end of the second detection circuit to continue stopping oscillation of the inverter lighting circuit in response to a trigger output from the detection circuit. Device.