JP3196251B2 - Discharge lamp defect detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor lighting device installed in a park, a road, or the like.

[0002]

2. Description of the Related Art Heretofore, a work for detecting a defect of a lamp of a lighting apparatus of this kind has been mainly performed at night. This is because in the daytime, the light is turned off by the photo switch and cannot be determined at a glance.

[0003]

In recent years, it has become more difficult for nighttime inspection workers to find one, and there is an increasing demand for a device capable of performing daytime inspection. However, a lighting lamp requires a considerable amount of time to light up, and a lot of time is required to check a large number of lighting devices. In addition, if the vehicle is moved and inspected during the day, the vehicle stops frequently and the stop time is long, which causes traffic congestion.

It is an object of the present invention to provide a device which can detect a lamp defect in the daytime and can perform the operation quickly.

[0005]

According to a first aspect of the present invention, there is provided an apparatus for detecting a point in a discharge lamp provided with a power supply voltage via a ballast, comprising: a zero cross detection means for detecting a zero cross of the power supply voltage; Current detecting means for detecting a current value supplied to the discharger, and whether or not the discharge lamp is in a defective state based on the level of the current value detected by the current detecting means after a predetermined time from the time when the zero-cross detecting means detects the zero-cross. It is configured to include a determination unit for determining whether the determination is made, and an output unit for outputting the determination result.

According to a second aspect of the present invention, there is provided an apparatus for detecting a point of a discharge lamp to which a power supply voltage is applied via a ballast, wherein the zero cross detection means for continuously detecting a zero cross of the power supply voltage; Voltage detecting means for detecting whether or not the power supply voltage value is within a predetermined range after a predetermined time from each time when the zero cross is detected, and current detection for detecting the presence or absence of a current between the ballast and the discharge lamp Means, determining means for determining whether or not the discharge lamp is defective based on the detection results of the voltage detecting means and the current detecting means, and output means for outputting the determination result of the determining means. It has a configuration.

[0007]

In the structure of the first aspect, the phase and level of the current I supplied to the ballast are different between when the discharge lamp is turned on and when the discharge lamp is not in operation. The judging means judges whether the discharge lamp is lit or not based on a change in the phase and level of the current I with reference to the point in time when the power supply voltage crosses zero. The output means outputs this determination result.

[0008] In the configuration of the second aspect, the zero-cross detecting means continuously detects the zero-cross of the power supply voltage. The voltage detecting means detects whether or not the power supply voltage within a predetermined time from each of a plurality of successive zero-cross points is within a predetermined range. As a result, the instantaneous fluctuation of the power supply voltage is detected, so that the determination means can know whether or not the light has disappeared in accordance with the presence or absence of the current detected by the current detection means, and accurately determine whether the discharge lamp is on or not. be able to. The output means outputs this determination result.

[0009]

FIG. 1 shows an embodiment of the present invention. The defect detection device 1 of this embodiment is a device that detects a defect of a lamp (discharge lamp) 3 of a lighting device 2. Both the lighting device 2 and the point detection device 1 are mounted on a single support provided near the road.

The lighting device 2 includes a cutout switch 4 for turning on and off a commercial power supply. A photoswitch 5 and a ballast 6 are connected between the cutout switch 4 and the lamp 3.

The fault detecting device 1 has a transformer 8 whose primary side is connected to both ends of a light receiving element 5a of a photo switch 5 via a fuse 7, and an input terminal of which is connected to a secondary side of the transformer 8. A rectifier circuit 9; a power supply circuit 10 connected to the output side of the rectifier circuit 9; a zero-cross detecting means 11 which is also connected to the output side of the rectifier circuit 9; Current detecting means 12 for detecting a current value between the ballasts 6; determining means 13 for determining whether the lamp 3 is on or off based on the output of the zero-cross detecting means 11 and the output of the current detecting means 12, And a light emitting diode 14 (output means) for displaying the judgment result of the means 13. The zero-cross detecting means 11 includes resistors 11A and 11B for dividing the output voltage of the rectifier circuit 9, and the resistors 11A and 11B.
Transistor 11 whose base is connected to the connection point between A and 11B
C. The current detecting means 12 includes a current transformer 12
A, a resistor 12B and an amplifier 12C.

The judging means 13 is constituted by a microcomputer, and includes a CPU (central processing unit) 15, a timer 16, an ADC 17 for A / D converting the current value of the current detecting means 12, and FIGS.
ROM 18 and CPU storing the processing program shown in FIG.
RAM for holding data used in the process of processing performed by 15
19, comprising an output port 20, which are connected to the bus 14. The light emitting diode 14 described above is connected to the output port 20.

The CPU 15 is supplied with a zero-cross (interrupt) signal from the zero-cross detecting means 11 and a timer (interrupt) signal from the timer 16.

Next, the fault detection device 1 thus configured
Will be described with reference to FIGS.

First, the zero cross interrupt processing of FIG. 3 will be described. The zero-cross detecting means 11 supplies a zero-cross signal to the CPU 15 when the voltage V shown in FIG. The CPU 15 uses the timer
16 is started (step 301). The timer 16 outputs a timer (1) signal to the CPU 15 after a lapse of t _{1 ms} after the start of counting and a timer (2) signal after a lapse of t _{2 ms} . Here, t _{1 ms} is the time when the current value I is at a certain level when the lamp 3 is out of _sight , as shown in FIG. 6, and t _{2 ms} is the time when the current value I is at another certain level when the lamp 3 is turned on. It is. Each level is obtained by operating the ballast 6 and the lamp 3 in advance.

Next, the timer (1) interrupt processing of FIG. 4 will be described. When receiving the timer (1) signal from the timer 16, the CPU 15 determines whether or not the current value I is within the specified level (step 401). If YES, the energization flag is set (step 402). The energization flag is reset (step 403), and the processing ends in any case.

Next, the timer (2) interrupt processing of FIG. 5 will be described. When the timer 16 receives the timer (2) signal from the timer 16, the CPU 15 determines whether the current value I is within the specified level (step 501). If YES, the CPU 15 sets a lighting flag (step 502), and the process ends. . NO at step 501
, Reset the lighting flag (step 503),
Determine whether the energization flag is set (step
504). If YES is determined in step 504, the non-energizing flag is reset (step 506). If NO is determined, the non-energizing flag is set (step 505), and 1 is added to the count value of the counter (step 507). This count value is a value indicating the length of the faulty period, and is 1 every half cycle of the power supply voltage.
Is added.

Next, the main processing of FIG. 2 will be described.
When there is no interrupt signal described above, the CPU 15 performs this main processing. First, the CPU 15 waits until the energization flag is set (step 201), and performs warm-up when the energization flag is set (step 202).
During this warm-up period, the lamp out display is canceled, the counter is cleared, and the extinguishing flag is set.
Here, the release of the lamp out display means to turn off the light emitting diode 14. The counter clear is to set the count value of the above-mentioned counter to zero. The setting of the extinguishing flag is to set a flag indicating that the lamp is extinguished due to extinguishing, that is, a voltage drop due to an instantaneous fluctuation of the power supply voltage.

Next, the CPU 15 determines whether the lighting flag is set (step 203), and if YES, cancels the lamp out display (step 204), and returns to step 203. If NO is determined in the step 203, it is determined in a step 205 whether or not the non-energizing flag is set. If YES in step 205, it is determined whether the count value is smaller than n (step 208). Here, the count value indicates the number of half cycles of the power supply voltage as described above, and indicates the length of the non-point (non-energized) period. n is a predetermined number. If YES is determined in step 208, the exit flag is set (step 209), and the process returns to step 203. Steps
If NO is determined in 208, the process returns to step 201. Steps
If NO is determined in 205, it is determined whether the extinction flag is set (step 206). If NO in step 205, the lamp is turned off and displayed (step 207), and the process returns to step 201. When YES is determined in the step 206, the process returns to the step 201. Note that the out-of-lamb indication indicates that the light emitting diode 14 is turned on.

According to the present embodiment, the lamp extinguishing is not displayed when the lamp goes out, so that useless lamp replacement can be prevented.

FIG. 7 is a block diagram of another embodiment of the present invention. The defect detection device 30 of this embodiment is also connected to the illumination device 2 similar to that shown in FIG. This fault detection device
Reference numeral 30 denotes a power supply circuit section, a zero-cross detecting means 32, a voltage detecting means 33, a current detecting means 34, a microcomputer 35 as a determining means, and a light emitting diode 36 as an output means.

The power supply circuit section 31 includes a transformer 36 having a primary side connected to both ends of the light receiving element 5a of the photo switch 5 via a fuse 37, a power supply circuit 38 connected to a secondary side of the transformer 36, A rectifier circuit 39 having an input terminal connected to the output side of each of the light receiving element 5a and the circuit opening / closing section 5b of the switch 5, a diode 40 having an anode connected to one output terminal of the rectifier circuit 39, It comprises a capacitor 42 provided between the cathode and ground.

The zero-cross detecting means 32 includes resistors 43 and 44 for dividing the output voltage of the rectifier circuit 39, a transistor 45 having a base connected to a connection point between the resistors 43 and 44, and turning on and off the transistor 45. It comprises a photocoupler 46 for detection and an inverter 47 for inverting the output of the photocoupler 46.

The voltage detecting means 33 includes resistors 48 and 49 for dividing the output voltage of the rectifier circuit 39, Zener diodes 50 and 51 having one ends connected to the connection points of the resistors 48 and 49, and Zener diodes 50 and 51. Transistors 52 and 53 whose bases are connected to the other ends of the transistors 52 and 53, and photocouplers 54 and 55 for detecting on / off of the transistors 52 and 53. Zener diode 50,
The respective threshold levels are V _ref2 and V _ref1 .

The current detecting means 34 has a primary side connected to a current transformer 56 connected between the ballast 6 of the lighting device 2 and the lamp 3.
And an interface 57 connected to the secondary side of the current transformer 56.

The microcomputer 35 includes a CPU 60, a timer 62, an input port 63, a ROM 64, a RAM 65, and an output port.
66 and a bus 67 connecting them. In addition, CPU
OSC 61 for generating a basic clock signal is connected to 60. The input port 63 is supplied with output signals of the photocouplers 54 and 55 of the voltage detecting means 33 and an output signal of the interface 57 of the current detecting means 34. Also C
The output signal of the inverter 47 of the zero-cross detecting means 32 is directly supplied to the PU 60. Further, the output from the output port 66 is made to reach the light emitting diode 36. 8 to 8 for operating the CPU 60 in the ROM 64.
A processing program as shown in the flowchart of 10 is stored.

Next, the operation of the defect detection device 30 will be described with reference to the flowcharts of FIGS.

First, the zero cross interrupt processing of FIG. 8 will be described. The zero-crossing detecting means 32 gives a zero-crossing interrupt signal to the CPU 60 when the voltage V shown in FIG. The CPU 60 thereby activates the timer 62 (step 801). The timer 62 outputs a timer signal to the CPU 60 after a lapse of t _ms from the start of the time measurement.
Here, t _ms is a quarter cycle of the power supply voltage as shown in FIG.

Next, the timer interrupt processing of FIG. 9 will be described. CPU60 is given the timer signal from the timer 62 the voltage V _t at that time, determines whether there between V _ref1 and V _ref2 (step 901). This judgment is based on input port 63
Of D ₀ terminal is performed based on the input of the D ₁ terminal. When the voltage V _t is greater than V _ref1, the transistor 53 Onto Nari D ₀ is a low level (logical value "0") of the voltage detecting means 33, and the when the voltage V _t is smaller than V _ref2 voltage detection transistor 52 is D ₁ turns off means 33 is at the high level (logical value "1"). CPU60 step
When YES is determined in 901, it sets a flag (hereinafter V _I flag) indicating the state of there is an input voltage. CPU60 is reset when it is determined NO in step 901, the V _I flag (step 903), adds 1 to the counter (without hereinafter V _I counter) indicating the time at which the state of no input voltage continues (step 904) . This counter is incremented by 1 every half cycle of the voltage V.

Next, the main processing of FIG. 10 will be described.
First CPU60 waits until V _I present flag is set (step 1001), the V _I present flag is set V ₁
The clear counter is cleared, the extinction flag is reset, and warm-up is performed (step 1002). Here, the extinguishing flag is a flag indicating that the lamp has been extinguished due to a voltage drop due to an instantaneous fluctuation of the power supply voltage, as in the above-described embodiment. Next, the CPU 60 cancels the lamp out display (step 1003). Here, releasing the lamp out display means to turn off the light emitting diode 36 connected to the output port 66. Then CPU60 is V _I present flag is determined whether it is set (step 1004), if it is set upright consumption flag determines whether it is set (step 1005), which also if it is set step Return to 1002. If NO is determined in step 1005, the current detecting means 34
To determine whether the output I _L of there (step 1007), in the case of there I _L to release the lamp-out display (step 1008)
Returns to step 1004, in the case of No I _L Back went the lamp out indication to (step 1009), step 1004. Here, the lamp out display indicates that the light emitting diode 36 connected to the output port 66 is turned on. CPU60 count value without V _I counter is determined whether n is less than if NO is determined in step 1004 (step 1010). Here, n is a predetermined number. NO in step 1010
When it is judged that the process returns to step 1001, if it is determined that YES is determined whether there I _L (step 1011), sets the stand consumption flag is regarded as fade-out for no I _L (step
1012), returns to step 1004, in the case of there I _L immediately returns to step 1004.

In this embodiment, 2-bit A / D conversion is performed using the zener diodes 50 and 51. However, the power supply voltage V may be input by an A / D converter 70 of an IC as shown in FIG. . In this case, the CPU 60 determines that Vt is _equal to _Vref1 and _Vref.
It detects whether it is between _ref2 . In the configuration shown in FIG. 12, a photocoupler is not used, and instead, a transformer 71 is provided so that a commercial power supply is not directly connected to the microcomputer 72 side.

[0032]

According to the first and second aspects of the present invention, it is possible to easily recognize the fault of the lamp even in the daytime, and to perform the inspection work quickly.

According to the first aspect of the present invention, since the current supplied to the ballast is detected, when the present invention is connected to an existing lighting device which is attached to a support, The work is very simple, since it is sufficient to work on the ballast usually provided at the lower part of the column.

According to the second aspect of the present invention, it is possible to detect whether the discharge lamp goes out or not, so that it is possible to accurately determine whether the discharge lamp is turned on or not.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire configuration of an embodiment of the present invention.

FIG. 2 is a flowchart for explaining the operation of the apparatus shown in FIG. 1;

FIG. 3 is a flowchart for explaining the operation of the apparatus shown in FIG. 1;

FIG. 4 is a flowchart for explaining the operation of the apparatus shown in FIG. 1;

FIG. 5 is a flowchart for explaining the operation of the device shown in FIG. 1;

FIG. 6 is a diagram showing a phase shift of a ballast supply current with respect to a power supply voltage of the apparatus shown in FIG. 1;

FIG. 7 is a diagram showing the overall configuration of another embodiment of the present invention.

8 is a flowchart for explaining the operation of the device shown in FIG.

FIG. 9 is a flowchart for explaining the operation of the device shown in FIG. 7;

FIG. 10 is a flowchart for explaining the operation of the device shown in FIG. 7;

FIG. 11 is a diagram illustrating a relationship between a power supply voltage and a reference voltage of the device illustrated in FIG. 7;

FIG. 12 is a diagram showing an example in which a part of the device shown in FIG. 7 is modified.

[Explanation of symbols]

 1 Non-point detection circuit 11 Zero cross detection means 12 Current detection means 13 Judgment means 32 Zero cross detection means 33 Voltage detection means 34 Current detection means 35 Judgment means (microcomputer)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-195898 (JP, A) JP-A-62-223289 (JP, A) JP-A-62-195897 (JP, A) 89971 (JP, A) JP-A-58-30096 (JP, A) JP-A-58-30097 (JP, A) JP-A-1-102876 (JP, U) JP-A-62-31398 (JP, U) 58-147195 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H05B 41/14-41/298

Claims (2)

(57) [Claims] 1. A discharge lamp fault detection device provided with a power supply voltage via a ballast, a zero cross detection means for detecting a zero cross of the power supply voltage, and a current for detecting a current value supplied to the ballast. Detecting means; determining means for determining whether or not the discharge lamp is defective based on the level of the current value detected by the current detecting means after a predetermined time from when the zero-cross detecting means detects the zero-crossing; And an output means for outputting the output of the discharge lamp. 2. An apparatus according to claim 1, wherein said power supply voltage is supplied via a ballast. 2. The apparatus according to claim 1, further comprising: a zero-cross detecting means for continuously detecting a zero-cross of said power supply voltage; Voltage detection means for detecting whether or not the power supply voltage value after a predetermined time from a time point is within a predetermined range, current detection means for detecting the presence or absence of a current between the ballast and the discharge lamp; A determination unit for determining whether or not the discharge lamp is defective based on a detection result of each of the detection unit and the current detection unit; and an output unit for outputting a determination result of the determination unit. Discharge point defect detection device.