JP2021086741A - Analysis device, monitoring method, program - Google Patents

Abstract

To simplify the detection of defects in a lighting device, for example, in managing road lighting and the like.SOLUTION: An analysis device is a plurality of lighting devices commonly connected to an AC power supply line, and detects the blinking frequency of the lighting device from a current flowing through the AC power supply line for the plurality of lighting devices each having a plurality of light emitting elements, and determines a defect of the lighting device corresponding to the blinking frequency on the basis of the current amplitude of the blinking frequency.SELECTED DRAWING: Figure 1

Description

The present invention relates to an analyzer, a monitoring method, and a program for analyzing a lighting device including a plurality of light emitting elements.

Road lighting should ensure a good visual environment for accurately grasping road conditions and traffic conditions at night or in places where the brightness changes suddenly, such as tunnels, to ensure the safety and smoothness of road traffic. Installed for the purpose. If there is a problem with the road lighting, for example, if the lighting in the tunnel is out of order during the daytime, the traveling speed of the passing vehicle will be reduced to ensure safety due to sudden changes in brightness. For this reason, traffic congestion may occur in the vehicle, which may lead to an accident. However, the current situation is that defects in road lighting are discovered through regular inspections and defect reports from passing vehicles. At the stage when a defect in the road lighting is reported, there are concerns about traffic jams and accidents during the period until repair or replacement. Necessary inspections are carried out at each stage to ensure that the road lighting facility meets the prescribed performance and function. According to the Road Lighting Facility Installation Standards of the Ministry of Land, Infrastructure, Transport and Tourism, performance is confirmed by measuring brightness or illuminance in principle, (1) average road surface brightness, (2) brightness uniformity (total uniformity), (3) visual function. Decreased glare (relative threshold increase), (4) inducibility, etc. are confirmed. In addition, inspections will be carried out in order to grasp the deterioration and damage of the function of the road lighting facility and to properly maintain the function by cleaning and repairing.

When sensors (eg, cameras) are individually installed on road lighting or the like to monitor the state of the lighting, the number of sensors installed becomes enormous, which is not realistic in terms of labor and cost of sensor installation.

Recently, a disaggregation technology (also called "equipment separation technology") that identifies electrical equipment such as home appliances in operation by analyzing the current waveform (combined current waveform) flowing through the main power supply has been proposed. There is. For example, in Patent Document 1, data on the fundamental wave and harmonic current and the phase with respect to their voltage is extracted from the measurement data detected by the measurement sensor installed near the feeding line inlet, and the fundamental wave and harmonic current and them are extracted. The operating state of the electrical equipment is estimated based on the data related to the phase with respect to the voltage of. According to the method of Patent Document 1 and the like, one measurement sensor may be installed for a plurality of lighting devices, so that the cost should be low. However, in a road illuminator, since a plurality of illuminating devices having the same configuration are connected to a feeder line, the individual current waveforms of the plurality of illuminating devices are separated from the analysis of the combined current waveform, and the individual illuminating devices are separated. It is difficult to identify the condition or defect. Therefore, it is difficult to apply the method to Patent Document 1 and the like to road lighting.

In Patent Document 2, a harmonic current having a feature not found in the harmonic current generated by the electric device in the electric device in the electric power consumer due to the operation of the specific electric device is made to flow in the indoor wiring circuit in the electric power consumer. The total load current and voltage are measured near the power supply line lead-in port of the power consumer, and the phase difference of the harmonic current with respect to the harmonic current and voltage of the total load current is obtained from the measured total load current and voltage. Disclosed is a configuration in which the operating state of the specific electric device is estimated based on the phase difference between the obtained harmonic current of the total load current and the harmonic current with respect to the voltage. In the method of Patent Document 2, in addition to the current sensor, it takes time and effort to install an additional harmonic generator, and extra power consumption (obstruction of economical operation) is also generated. In addition, tunnel lighting, which is the standard for installing road lighting facilities, should be operated efficiently and economically in consideration of traffic safety (operation of 5-8 tunnel lighting), which may cause problems. is there.

Regarding defect detection of a lighting device, for example, Patent Document 3 describes a device that detects a failure of at least one street light among a plurality of street lights that can be commonly connected to an AC (Alternate Current) power source. A means for acquiring an active power measurement value (P) indicating the total active power (Pt) supplied to the plurality of street lights by the AC power supply, and the AC power supply to the plurality of street lights. A means for acquiring an invalid power measurement value (Q) indicating the total active power (Qt) supplied with the above, and for detecting a fluctuation (ΔP) of the acquired active power measurement value (P). Means, means for detecting the fluctuation (ΔQ) of the acquired negative power measurement value (Q), the acquired active power measurement value (P), and the acquired invalid power measurement value (Q). Discloses a device having a configuration including a failure determining means for determining whether or not at least one failure of the street light has occurred based on the detected fluctuations (ΔP, ΔQ). .. With the method of Patent Document 3, it is not possible to determine which street light has failed.

Patent Document 4 describes a lighting management system that can easily and quickly disconnect and restore the lighting from the main power supply in the event of a ballast insulation failure or a lamp failure. Is disclosed. This lighting management system is a system that manages a plurality of lightings connected to the main power supply line and the dimming power supply line, and the switch connected to the main power supply line and the main power supply and the dimming power supply are turned on. The main power is turned off when the preset switch opening / closing time elapses from the time when the power detection unit that detects the order is detected and the dimming power → main power on order is detected by the power detection unit. Each of the plurality of illumination lamps is provided with a terminal device including a control unit that controls the opening and closing of the switch when the switch is opened and closed. When the road light of the road light pole N0.1 is normal, the circuit current value changes significantly when shifting from full lighting to dimming light. On the other hand, when the road light of the road light pole N0.1 has a lamp defect, the circuit current value does not change and shows a substantially constant value even when the lighting is changed from full lighting to dimming lighting. Therefore, it is possible to determine the lamp defect by monitoring the magnitude of the change in the circuit current value at the time of full lighting and the time of dimming lighting. Patent Document 4 describes that the road light pole N0. Of the road light in which the lamp defect occurs is specified from the lighting timing of each road light pole N0.

Japanese Unexamined Patent Publication No. 2000-292465 Japanese Unexamined Patent Publication No. 2004-38765 Special Table 2010-532073 Japanese Unexamined Patent Publication No. 2002-43071

As described above, when a sensor (for example, a camera) or the like is individually installed for a lighting device such as a road lighting device and the state of the lighting device is monitored, the number of sensors or the like installed is enormous, and it is troublesome to install the sensor or the like. It is not realistic in terms of cost and cost. For example, in Patent Document 4, a terminal device dedicated to each of a plurality of lighting lamps (a switch connected to the main power supply line, a power supply detection unit that detects the order in which the main power supply and the dimming power supply are turned on, and a switch opening / closing It has a control unit for controlling).

With the disaggregation technique disclosed in Patent Document 1 and the like, it is difficult to identify the state of each lighting device by waveform-separating the combined currents of a plurality of lighting devices having the same configuration. That is, with the above disaggregation technique, it is not possible to identify which of the plurality of lighting devices having the same configuration is defective.

Therefore, an object of the present invention is to provide a device, a method, and a program that enable simplification of detection of defects in a lighting device, for example, in managing a road lighting or the like.

According to one embodiment of the present invention, from the current flowing through the AC power supply line to the plurality of lighting devices commonly connected to the AC power supply line, each of which has a plurality of light emitting elements. A frequency detection unit that detects the blinking frequency of the lighting device, and a defective lighting device determination unit that determines the defect of the lighting device corresponding to the blinking frequency based on the detected current amplitude of the blinking frequency. An analyzer is provided.

According to one embodiment of the present invention, from the current flowing through the AC power supply line to the plurality of lighting devices that are commonly connected to the AC power supply line and each of which has a plurality of light emitting elements. Provided is a monitoring method for detecting a blinking frequency of the lighting device and determining a defect of the lighting device corresponding to the blinking frequency based on the current amplitude of the blinking frequency.

According to one embodiment of the present invention, from the current flowing through the AC power supply line to the plurality of lighting devices commonly connected to the AC power supply line, each of which has a plurality of light emitting elements. Provided is a program for causing a computer to execute a frequency detection process for detecting the blinking frequency of the lighting device and a process for determining a defect of the lighting device corresponding to the blinking frequency based on the current amplitude of the blinking frequency. ..

According to another embodiment of the present invention, RAM (Random Access Memory), ROM (Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), USB (Universal Serial Bus) device, SSD (Solid State Device), etc. A non-temporary computer-readable recording of the above program, such as a semiconductor memory of the above, or a storage device such as a storage device such as an HDD (Hard Disk Drive), a CD (Compact Disc) or a DVD (Digital Versatile Disc). The medium is provided.

According to the present invention, for example, in the management of road lighting and the like, it is possible to simplify the detection of defects in the lighting device.

It is a figure explaining one Embodiment of this invention. (A) and (B) are diagrams for explaining the LED lighting device according to the embodiment of the present invention. It is a figure explaining the operation of the LED lighting apparatus in one Embodiment of this invention. It is a figure explaining the operation of the LED lighting apparatus in one Embodiment of this invention. (A) and (B) are diagrams for explaining the LED lighting device according to the embodiment of the present invention. It is a figure explaining the structure of the current sensor and the analyzer in one Embodiment of this invention. It is a figure explaining the structure of the analyzer in one Embodiment of this invention. It is a figure explaining the structure of the analyzer in one Embodiment of this invention. (A) and (B) are diagrams for explaining the operation of the analyzer according to the embodiment of the present invention. It is a figure explaining the operation of the analyzer in another embodiment of this invention. It is a figure explaining the computer mounting example of the analyzer of embodiment of this invention.

An embodiment of the present invention will be described. FIG. 1 is a diagram schematically illustrating the configuration of an exemplary embodiment of the present invention. A plurality of LED (Light Emitting Diode) lighting devices 10A, 10B, and 10C commonly connected to a power supply line 21 from an AC (Alternate Current) power supply 20 are provided. The power supply line 21 may be a branch line from the distribution board. In each of the LED lighting devices 10A, 10B, and 10C, the AC-DC converter 13 converts the AC voltage into a DC (Direct Current) voltage. A DC-DC converter in which an input terminal is connected to the output terminal of the AC-DC converter 13 may be provided, and the DC voltage from the AC-DC converter 13 may be boosted or stepped down to provide a desired DC power supply voltage. .. Under the control of the controller 14, the switch 12 performs a dynamic lighting operation between the n LED groups A1 to the LED group An. The LED lighting devices 10B and 10C may have the same configuration as the LED lighting device 10A. Alternatively, the LED lighting devices 10B and 10C may have a different number of LED groups from the LED lighting device 10A. In FIG. 1, three LED lighting devices are shown simply for the sake of simplification of the drawing, but the number of LED lighting devices is not limited to three.

The current sensor 30 senses the AC current flowing through the power supply line 21 and transmits it to the analyzer 100. The AC current flowing through the power supply line 21 is the combined current (sum of currents) of the currents of the LED lighting devices 10A, 10B, and 10C.

The analyzer 100 acquires and monitors the AC current value detected by the current sensor 30, and when the current value changes by a predetermined change amount or rate or more (when it falls below), at least one of the LED lighting devices. It is determined that a defect (defect) has occurred in the LED lighting device, and the defective LED lighting device is identified. At that time, the analyzer 100 detects the blinking frequency of the LED lighting device that performs the dynamic lighting operation from the AC current value (time series data of the AC current) detected by the current sensor 30, and is based on the current amplitude of the blinking frequency. , The defect determination of the LED lighting device corresponding to the blinking frequency is performed. When the current amplitude of the blinking frequency is equal to or less than a predetermined value, the analyzer 100 determines that the LED lighting device corresponding to the blinking frequency is defective. According to this embodiment, even if the LED lighting devices 10A, 10B, and 10C have the same configuration, the analyzer 100 has an AC current value detected by the current sensor 30 (combined load current of the LED lighting devices 10A, 10B, and 10C). By extracting the current amplitudes of the blinking frequencies of the LED lighting devices 10A, 10B, and 10C, it is possible to determine (estimate) whether or not there is a defect in each LED lighting device or the degree of the defect.

Hereinafter, an example of the blinking frequency (reciprocal of the blinking cycle) of each LED lighting device will be described. The LED lighting devices A, B, and C each perform a dynamic lighting operation, and the blinking frequencies of the LED lighting devices A, B, and C are set to different values. In the LED lighting device A, the controller 14 controls the switch 12, and one LED group is turned on in order from the LED group A1 for the LED groups A1 to the LED group An (during this period, the remaining LED groups are not turned on), and n pieces are turned on. When all the lighting of the LED group A1 to the LED group An has been completed, the lighting of one LED group is turned on again in order from the LED group A1. In the LED lighting device A that dynamically lights, the period during which all the blinking (on / off) of the n LED groups A1 to the LED group An goes around is called the "blinking cycle" of the LED lighting device A.

The blinking cycle of the LED lighting devices A, B, and C is set to the same cycle during normal operation of the LED lighting devices A, B, and C, and during the period of monitoring the current flowing through the power supply line 21 with the analyzer 100 for analysis. When the device 100 detects a change in the current value and identifies a defective LED lighting device, the blinking cycles of the LED lighting devices A, B, and C may be set to different values. In this case, the analyzer 100 notifies the controllers 14 of the LED lighting devices A, B, and C of different blinking cycles, so that the blinking cycles of the LED lighting devices A, B, and C are set to different values. You may try to do it. In this case, the analyzer 100 may be arranged in a control device (control panel) that controls the LED lighting devices A, B, and C. Alternatively, a management server (not shown) or the like may notify the controllers 14 of the LED lighting devices A, B, and C via a communication line (network) of different blinking cycles. The controller 14 of the LED lighting devices A, B, and C may store the notified blinking cycle in an internal storage unit (not shown).

The analyzer 100 acquires (measures) in advance the current value of the combined current flowing through the power supply line 21 during normal operation of the LED lighting devices A, B, and C whose blinking cycles are set to different values, and the blinking cycle is set. The current values of the LED lighting devices A, B, and C set to different values during normal operation may be held in a storage device (not shown). Alternatively, the analyzer 100 may be configured to hold in advance the current value at the time of failure (fault) of the LED lighting devices A, B, and C in a storage device (not shown). For example, in the LED lighting device A of FIG. 1, one LED group is not lit (defective), and two LED groups are not lit (defective). .. .. , The current of the LED lighting device A in the case where the n LED groups are not lit (defective) may be stored in the storage device in advance. In this case, in the analyzer 100 or a management server (not shown), the current during operation of one LED group is calculated from the specifications of the LED group, and n group out of N is not lit (defective). The current of the LED lighting device A may be obtained. When the analyzer 100 determines that the LED lighting device A is defective, it determines how defective the LED lighting device A is (for example, the number of non-lighting LED groups) based on the current amplitude of the lighting frequency of the LED lighting device A. It may be judged (estimated).

The analyzer 100 may set the blinking cycle for the controllers 14 of the LED lighting devices A, B, and C via a wired or wireless communication line. Alternatively, a management server (not shown) connected to the analyzer 100 is provided in the cloud or the like, and a network such as the Internet or LAN (Local Area Network) or the Internet or a LAN (Local Area Network) is provided from the management server or the like on the cloud side to the LED lighting devices A, B, and C. The blinking cycle may be set via the communication line. Further, when the current sensor 30 is configured by an IoT (Internet of Things) device and is connected to a cloud server or the like via a gateway, the analyzer 100 may be mounted on the cloud server.

2A and 2B are diagrams for explaining an example of the configuration of the LED lighting device A in FIG. 1. In FIG. 2, for simplicity, n of the LED groups A1 to LED group An in FIG. 1 is set to 4, and LED groups A1 to LED group A4 are used. Further, each LED group has a configuration in which three white LEDs are connected in series, but the number of LEDs connected in series is not limited to three. Although not particularly limited, the white LED may be configured to produce white by combining a yellow phosphor that emits a complementary color of yellow that is excited by the blue light of the blue LED.

The AC-DC converter 13 of the power supply unit converts, for example, an AC voltage of 110-220V into a DC voltage of 12V, 24V, or the like. The DC-DC converter 15 generates a desired DC voltage by stepping down (or boosting) the DC voltage from the AC-DC converter 13. In FIG. 2A, the DC voltage (for example, 12V) from the AC-DC converter 13 is defined as the power supply voltage VCS, but the DC voltage from the AC-DC converter 13 is boosted by the DC-DC converter (for example). Of course, 24V or the like) may be supplied as the power supply voltage VCS to each LED group via the switch 12 (LED driver).

The switch 12 (LED driver) includes four switches SW1 to SW4 that are turned on and off, respectively, based on the control signals D1 to D4 from the controller 14. Each switch SW1 to SW4 includes a transistor Q1 (switch transistor). FIG. 2B is a diagram schematically showing the configuration of SW1 among the four switches SW1 to SW4 (SW2 to SW4 also have the same configuration). As shown in FIG. 2B, the emitter of the transistor Q1 (PNP transistor) is connected to the power supply voltage VCS, the base is connected to the control signal D1, and the collector corresponds to the + terminal of the corresponding LED group (LEDs connected in series). It is connected to the anode side of one end of the. When the control signal D1 is at the ground potential (Low level), the collector and emitter conduct (transistor Q1 is on), the collector supplies a DC power supply voltage VCS to one end of the corresponding LED group, and the LED group is forward biased. Then, a current (forward current) flows and lights up (lights up). When the control signal D1 is the power supply voltage VCS (High level), the transistor Q1 is turned off, no current flows through the LED group, and the LED group does not light (light up). Of course, the switch 12 (LED driver) may be provided with a constant current circuit that controls the LED group to be supplied with a constant current. Further, the transistor Q1 is not limited to the bipolar transistor, and of course, it may be a MOS (Metal Oxide Transistor) transistor.

The power supply voltage VCS is equal to or greater than (forward voltage of LEDs) × (number of LEDs connected in series). For example, when the DC voltage (for example, 12V) from the AC-DC converter 13 is the power supply voltage VCS, and the forward voltage of the white LEDs in the LED group is 3.2V (for example, the forward current: 20mA), FIG. As shown in A), one group can correspond to an LED group in which three white LED chips are connected in series. Alternatively, when the DC voltage from the AC-DC converter 13 is 24V, one group can correspond to a group of LEDs in which six white LEDs having a forward voltage of 3.2V are connected in series. In FIG. 2A, the DC-DC converter 15 steps down the DC voltage from the AC-DC converter 13, for example, a controller 14 composed of a 3.3V CMOS (Complementary MOS (Metal Oxide Semiconductor)) circuit. Supply power supply voltage. In this case, when the power supply voltage VCS is 12V, a level conversion circuit (not shown) for converting the voltage amplitude of the control signals D1 to D4 (logic signals) from the controller 14 from the 3.3V system to the 12V system is provided. When lighting more LEDs in each LED group, a plurality of LED series circuits may be connected in parallel. In the LED lighting device A, assuming that the AC input voltage of the AC-DC converter 13 is 100V, the DC output voltage is 24V, the DC current is 1A, and the power factor (= active power / apparent power) is 80%. The AC current of the LED lighting device A is 24 × 1 / (0.8 × 100) = 0.3A.

FIG. 3 is a diagram illustrating an example of dynamic lighting between the LED groups A1 to the LED group A4 in the LED lighting device A of FIG. In the controller 14 of the LED lighting device A, the dynamic lighting of the LED group is started from the LED group A1. A timer counter (not shown) built into the controller 14 counts up from 0. The controller 14 sets the control signal D1 to the Low level (ground (GND) potential) at the count value 1 (CNT1), and sets the control signal D1 to the High level (VCC) when the count value 2 (CNT2) is reached. The count value is cleared to 0, and the lighting control of the LED group A2 is switched. In the controller 14, the timer counter (not shown) counts up from 0, and when the count value 1 (CNT1) is reached, the control signal D2 is set to the Low level, and when the count value 2 (CNT2) is reached, the control signal D2 is set. The high level is set, the count value is cleared to 0, and the control is switched to the lighting control of the LED group A3. A timer counter (not shown) counts up from 0, and when the count value 1 (CNT1) is reached, the control signal D3 is set to the Low level, and when the count value 2 (CNT2) is reached, the control signal D3 is set to the High level. The count value is cleared to 0, and the control is switched to the lighting control of the LED group A4. A timer counter (not shown) counts up from 0, and when the count value 1 (CNT1) is reached, the controller 14 sets the control signal D4 to the Low level, and when the count value 2 (CNT2) is reached, the controller 14 sets the control signal D4. The high level is set, the count value is cleared to 0, and the control is switched to the blinking control of the LED group A1. When the control signals D1 to D4 from the controller 14 are at the Low level (ground (GND) level), the transistors Q1 of the switches SW1 to SW4 are turned on, and a current (forward current) flows through the LED groups A1 to A4, respectively. When the control signals D1 to D4 are at the high level (VCC), the transistors Q1 of the switches SW1 to SW4 are turned off, no current flows through the LED groups A1 to A4, and the lights are turned off. In FIG. 3, the blinking cycle is the period from the start of lighting of the LED group A1 to the start of lighting of the LED group A1 after all the blinking of the LED group A2, the LED group A3, and the LED group A4 has completed.

The period from 0 to the count value 1 (CNT1) of the timer counter (not shown) built in the controller 14 may be set as a blank period. During the blank period, all LED groups A1 to A4 are turned off. (Blank period + lighting period) × (number of LED groups) is the blinking cycle of the LED lighting device A. The duty ratio (ratio of ON and OFF) is lighting period / {(blank period + lighting period) × (number of LED groups)}.

The timer counter is not limited to the up counter, and may be a down counter (programmable down counter). For example, when the countdown is counted down from the set value CNT2 and the count value becomes CNT2-CNT1, the controller 14 sets the control signal D1 or the like to the Low level, and controls when the count value becomes 0. The signal D1 is set to the High level, the count value is set to CNT2, and the lighting control of the LED group A2 is switched.

Further, in FIG. 3, the program control by the controller 14 using the timer counter is illustrated, but in any case, the level of the sawtooth wave (voltage) generated by the sawtooth wave generator (not shown) can be compared by the comparator to perform PWM ( Pulse Width Modulation) It may be configured by using a circuit that generates a waveform. For example, when the voltage comparator 1 (not shown) that inputs the output voltage from the saw wave generator (not shown) detects the voltage level corresponding to the count value CNT1 in FIG. 3, this detection signal is used as a set signal and is the second. When the set reset latch (not shown) of 1 is set, the control signal D1 which is the output thereof is set to the Low level, and the voltage level corresponding to the count value CNT2 in FIG. 3 is detected by the voltage comparator 2 (not shown), this is obtained. Using the detection signal as a reset signal, the first set reset latch is reset to set the control signal D1 to the high level, and the outputs of the voltage comparators 1 and 2 are disconnected from the first set reset latch. Control to switch to a second set reset latch (not shown) that outputs the control signal D2 may be performed (the same applies to the third and fourth set reset latches that output the control signals D3 and D4).

FIG. 4 is a diagram illustrating dynamic lighting of LED lighting devices A and B having different blinking cycles. The maximum value CNT3 of the timer counter of the LED lighting device B is set to be larger than the maximum value CNT2 of the timer counter of the LED lighting device A. The lighting period TB0 of the LED lighting device B is longer than the lighting period TA0 of the LED lighting device A. Further, the lighting period TB of the LED lighting device B is longer than the lighting period TA of the LED lighting device A.

In FIG. 2 (A), the switch 12 (LED driver) is provided on the + terminal (anode) side of the LED group. For example, as shown in FIG. 5 (A), the switch 12 is attached to the − terminal (cathode) of the LED group. ) May be provided. In the configuration of FIG. 5 (A), as shown in FIG. 5 (B), the switch 12 has a transistor Q1 (LED driver) composed of an NPN transistor. In FIG. 5 (A), when the control signals D1 to D4 from the controller 14 are at the high level, the transistors Q1 (FIG. 5 (B)) of the switches SW1 to SW4 are turned on, respectively, and the current is applied to the LED groups A1 to the LED group A4. (Forward current) flows and lights up, and when the control signals D1 to D4 are at the Low level (GND level), the transistor Q1 of the switches SW1 to SW4 is turned off, and no current flows through the LED groups A1 to A4, which is not possible. It lights up.

FIG. 6 is a diagram illustrating an example of the configuration of the current sensor 30 and the analyzer 100. Although not particularly limited, the current sensor 30 has a measurement band of a wide band from direct current to MHz (Mega Hertz) order, such as a Hall element type zero flux system in which a Hall element and a current transformer are combined. Moreover, it is composed of a current sensor suitable for detecting a minute current. A secondary current flows through the feedback winding (feedback coil) 305 on the secondary side so as to cancel (cancel) the magnetic flux generated in the magnetic core 301 due to the AC current flowing through the power supply line 21. The Hall element 302 detects the magnetic flux that cannot be canceled in the low frequency range from the direct current, the output voltage of the Hall element 302 is input to the amplifier (AMP) 304, and the amplifier (AMP) 304 feeds back so as to cancel the magnetic flux. A secondary current is passed through the winding 305. The secondary current of the feedback winding 305 flows through the shunt resistor 306. A voltage proportional to the current flowing through the feedback winding 305 is generated across the shunt resistor 306. The voltage across the shunt resistor 306 is converted into a digital signal by an analog to digital converter (ADC). The voltage across the shunt resistor 306 may be input to the ADC 307 via a voltage follower (not shown). The digital signal from the ADC 307 is input to the transmission circuit 308. The transmission circuit 308 may convert the parallel digital signal from the ADC 307 into a serial bit signal and output it serially in synchronization with the multiplication clock of the sampling frequency of the ADC 307. The current sensor 30 may be a clamp type that sandwiches the power supply line 21. Needless to say, the current sensor 30 is not limited to the Hall element detection type zero flux method as long as it has a desired measurement accuracy and band. The ADC 307 may be a delta-sigma type ADC that serially outputs a digital signal obtained by converting an analog input signal.

In the analyzer 100, the receiving circuit 111 receives the digital signal transmitted from the current sensor 30. The receiving circuit 111 is a clock-and-data recovery circuit that extracts a clock signal whose frequency and phase are synchronized with the input serial bit signal, restores data synchronized with the clock signal obtained by dividing the clock signal, and outputs parallel bits. May be provided. When the ADC 307 of the current sensor 30 outputs an M-bit digital signal (M depends on the desired resolution, accuracy, etc., for example, M = 10 or 12, etc.), the clock and data recovery circuit (not shown) of the receiving circuit 111 , The clock signal in the device is synchronized with the received serial bit data, the serial bit data is converted into N-bit parallel data by the serial parallel conversion circuit using the clock signal in the device, and the clock signal in the device is divided by M. N-bit parallel data may be supplied to the controller 112 in synchronization with the clock.

In FIG. 6, the reception circuit 111 described above is configured to immediately and serially input a digital signal (bit signal) output from the current sensor 30, but the current sensor 30 is at the time of the measured instantaneous current value. After storing the series data in a buffer (not shown) in the current sensor 30, the time series data (predetermined byte length) is stored in a packet, and the packet is analyzed via, for example, a wired or wireless communication line. It may be transmitted to the device 100. The receiving circuit 111 of the analyzer 100 may receive the packet and pass the time-series data of M-bit parallel data per sample from the data stored in the packet to the assembly controller 112.

The controller 112 realizes the analysis function of the analyzer 100, and outputs the information of the defective LED device to the display device 114 when the presence / absence of detection of the defective LED device and the defective LED device are identified. The controller 112 may set different blinking cycles for the LED lighting devices A, B, and C of FIG. 1 via the communication device 115 via a wired or wireless network. Alternatively, the communication device 115 may transmit the information of the defective LED device to a management server (not shown), a terminal (mobile terminal) of a person in charge of maintenance, or the like that performs maintenance / management of the LED lighting device. The storage device 113 may be configured to store the blinking cycle, lighting time (duty ratio), dimming information, and the like of the LED lighting devices A, B, and C.

FIG. 7 is a diagram illustrating a functional configuration of the analyzer 100. The function of FIG. 7 is performed by, for example, the controller 112 of FIG. The controller 112 may be configured to include a processor (not shown) or a digital signal processor (DSP) specialized for signal processing. Referring to FIG. 7, the analyzer 100 includes a current monitor unit 101, a current change detection unit 102, a frequency detection unit 103, a defective LED lighting device determination unit 104, and a determination result output unit 105.

The current monitoring unit 101 monitors the peak value of the time series data (time series data of the instantaneous current for each sampling time measured by the current sensor 30) from the receiving circuit 111 of FIG. 6, and sets the maximum value of the peak value. The memory may be retained, or the RMS (Root Mean Square) value, the average value, or the like may be calculated and stored.

The current change detection unit 102 determines that there is a current change when the measurement result (for example, either the maximum value of the peak or the RMS value or the average value) is lower than a predetermined value. The current change detection unit 102 changes the amount or rate of change (= (typical value-measured value) / typical value) from the typical value of the measurement result (for example, the maximum value of the peak, or the RMS value or the average value). ) Is larger than a predetermined ratio (that is, when the amount of change in the measured value or the rate of change is large), it may be determined that there is a current change.

When the current change detection unit 102 determines that there is a current change, the frequency detection unit 103 blinks the respective LED lighting devices A, B, and C from the data received by the reception circuit 111 (time-series data of the instantaneous current). The frequency component corresponding to the frequency (= 1 / blinking cycle) is detected, and for example, the current amplitude is obtained. Then, when the current amplitude of the corresponding blinking frequency component is equal to or less than a predetermined value (non-negative value), the LED lighting device having the blinking frequency is determined to be defective. For example, for the LED lighting device A having a blinking frequency of TA, the frequency detection unit 103 performs lock-in detection (synchronous detection) at the blinking frequency (1 / TA) with respect to the time-series data of the instantaneous current received by the receiving circuit 111. When the amplitude component (current amplitude) corresponding to the blinking frequency (1 / TA) is equal to or less than a predetermined value, it is determined to be defective. The predetermined value is, for example, an amplitude component corresponding to the blinking frequency (1 / TA) when at least one LED group among the LED groups A1 to A4 is not lit (failure) in the LED lighting device A. It may be (current amplitude).

FIG. 8 is a diagram illustrating an example of the function of the frequency detection unit 103 of the synchronous detection method as the frequency detection unit 103 of the analyzer 100. In FIG. 8, the signal V _s (t) to be inspected is composed of time-series data received by the receiving circuit 111 from the value obtained by converting the instantaneous current flowing through the power supply line 21 by the ADC 307 of the current sensor 30 into a digital signal. The signal V _s (t) to be inspected corresponds to an AC current in which the currents of the LED lighting devices A to C are superimposed. As described above, the LED lighting devices A to C are connected to the management server (not shown) or the like before the lighting frequency of each LED lighting device is detected from the current flowing through the power supply line 21 in the analyzer 100. The lighting frequencies are set to be different from each other, and the analyzer 100 holds information on the lighting frequencies set for each LED lighting device.

_{In the frequency detection unit 103, the oscillator 1031 generates a reference signal V r} (t) of the blinking frequency of the LED lighting device to be detected. The first mixer 1032 multiplies the signal to be inspected (measurement signal) V _s (t) by the reference signal V _r (t). The 90 degree phase shifter 1033 shifts the phase of the reference signal V _r (t) by 90 degrees. The second mixer 1034 multiplies the signal to be inspected V _s (t) by the reference signal V _r '(t) phase-shifted by 90 degrees. The first low pass filter (LPF1) 1035 outputs a low frequency component (DC component) X of the output of the first mixer 1032. The second low-pass filter (LPF2) 1036 outputs the low frequency component (DC component) Y of the output of the second mixer 1034.

_{Let f r be} the blinking frequency of the LED lighting device to be detected (angular frequency ω _r = 2π _{f r} ). The frequency of the test signal V _s (t) and f _s (angular frequency ω _s = 2πf _s), and the phase phi. In the following, as shown in FIG. 3, in the LED lighting device, the current (DC current) flowing during the lighting period of the LED groups A1 to A4 has the same frequency ( _fr ) as the blinking frequency as the basic frequency. It is assumed that the current signals have different phases (corresponding to the phase difference between the control signals D1 to D4). Here, it is assumed that the AC current flowing through the power supply line 21 includes the _{signal V s (t) to be inspected having a frequency of f s} and a phase of φ, and this is represented by a sinusoidal signal. The input stage of the frequency detection unit 103 may be provided with a high-pass filter that cuts off the power supply frequency component (50Hz / 60Hz) and allows the blinking frequency component (frequency higher than the power supply frequency) of the LED lighting device to pass through. Good.

V _s (t) = A _s cos (ω _s t + φ) ・ ・ ・ (1)
V _r (t) = √2cos (ω _r t) ・ ・ ・ (2)

The _{signal obtained by phase-shifting V r} (t) = √2cos (ω _r t) by 90 degrees (the signal input to the mixer 1034) can be expressed as follows.
V _r '(t) = √2cos (ω _r t + 90) = -√2sin (ω _r t) ・ ・ ・ (3)

The output of the first mixer 1032 is
V _s (t) * V _r (t) = A _s cos (ω _s t + φ) * √ 2 _{cos (ω r} t)
= (A _s / √2) * {cos ((ω _s + ω _r ) t + φ) + cos ((ω _s --ω _r ) t + φ)} ・ ・ ・ (4)

The output of the second mixer 1034 is
V _s (t) * V _r '(t) = -A _s cos (ω _s t + φ) * √2 sin (ω _r t)
=-(A _s / √2) {sin ((ω _s + ω _r ) t + φ) --sin ((ω _s --ω _r ) t + φ)} ・ ・ ・ (5)

The first low-pass filter 1035 _{blocks (cuts) the frequency component (A s} / √2) cos ((ω _s + ω _r ) t + φ) and the low frequency component (A _s / √2) cos ((ω)). _{Pass s} -ω _r ) t + φ).
X = (A _s / √2) cos ((ω _s --ω _r ) t + φ) ・ ・ ・ (6)

The second low-pass filter 1036 blocks the frequency component (A _s / √2) sin ((ω _s + ω _r ) t + φ) and blocks the low frequency component (A _s / √2) sin ((ω _{s --ω). Let r} ) t + φ) pass.
Y = (A _s / √2) sin ((ω _s --ω _r ) t + φ) ・ ・ ・ (7)

When ω _s = ω _r ,
_{X = (A s / √2)} cos (φ) ··· (8)
_{Y = (A s / √2)} sin (φ) ··· (9)

The amplitude R of the frequency component ω _{r is}
^{R = √ (X 2 + Y} 2) = A s / (√2) ··· (10)
It can be found by.

The phase θ of the frequency component ω _{r is}
θ = arctan (Y / X) ・ ・ ・ (11)
It can be found by.

The first low-pass filter 1035 and the second low-pass filter 1036 are composed of a digital filter (for example, an IIR (Infinite Impulse Response) filter or the like).

By generating the reference signal Vr (t) of the blinking frequency of each LED lighting device to be detected, the amplitude of the blinking frequency of each LED lighting device can be obtained from the current (AC current) measured by the current sensor 30. _{For example, assuming} that the blinking frequencies of the LED lighting devices A, B, and C in FIG. 1 are f _rA , f rB, and f _rC (for example, f _rA > f _rB > f _rC ), the oscillator 1031 has frequencies f _rA and f _rB. , the reference signal V _r (t) is sequentially generated in f _rC, from the inspection signal V _s (t), successively, to obtain the frequency f _rA, f _rB, amplitude R _a of f _rC, R _B, and R _C .. In this case, the frequency detecting unit 103, an oscillator 1031, frequency f _rA, f _rB, and a frequency sweep in the order of f _rC, and detects the amplitude corresponding to a respective frequency.

The frequency detection unit 103, which performs frequency sweep in this way and obtains the current amplitude corresponding to the blinking frequency of the LED lighting device from the current, corresponds to obtaining the amplitude of the corresponding frequency component in the frequency spectrum of the frequency domain. Can be done. In this case, the signal V _s (t) to be inspected in the time domain is converted into the frequency domain by FFT (Fast Fourier Transform) (or DFT (Discrete Fourier Transform)), and the amplitude of the spectrum of the _{frequency component ω r is obtained.} May be good. _{In this case, R A} , R _B , and R _C are obtained from the amplitudes of the spectra of the frequency bins corresponding to _{the blinking frequencies f rA} , f _rB , and f _r C of each LED lighting device in the frequency domain obtained by one FFT. be able to.

Although the two-phase lock-in amplifier method by digital signal processing has been described with reference to FIG. 8, analog signal processing (mixer, oscillator, etc.) is received from the current sensor 30 (terminal voltage of shunt resistance 306 in FIG. 6). The low-pass filter is composed of an analog circuit), and X and Y may be obtained by a two-phase lock-in amplifier method, and the amplitude R may be obtained.

When the amplitude R detected by the frequency detection unit 103 is equal to or less than a predetermined value, the defective LED lighting device determination unit 104 determines that the LED lighting device having the blinking frequency is defective. The determination result output unit 105 outputs the determination result to the display device 114 or notifies the contact terminal, the management center, etc. (the management server, etc. that maintains and manages the road lighting) via the communication device 115. .. The defective LED lighting device determination unit 104 may determine the degree of failure of the LED lighting device that has been determined to be defective. For example, the defective LED lighting device determination unit 104 may determine how many LED groups corresponding to the n LED groups of the LED lighting device are not lit.

FIG. 9 is a diagram illustrating the method of the embodiment, and illustrates the operation procedure of the analyzer 100. Referring to FIG. 9A, the analyzer 100 of the present embodiment inputs and stores the blinking frequency of the dynamic lighting of each LED lighting device in the storage device in advance (S01). The blinking frequency of the dynamic lighting of each LED lighting device may be set from the management server (not shown) to the controller 14 (FIG. 1 or the like) in each LED lighting device via the communication network. At that time, the management server (not shown) may notify the blinking frequency of each LED lighting device to the analyzer 100 via the communication network, and store the blinking frequency in the storage device of the analyzer 100. Alternatively, a maintenance person or the like may input the settings from the screen of the input device or the display device of the analyzer 100. The peak value, average value, RMS value, and the like of the current consumption during dynamic lighting during normal operation of each LED lighting device may be set in advance in the storage device of the analyzer 100.

Referring to FIG. 9B, at the time of monitoring, the analyzer 100 receives the current value (time series data of instantaneous current) measured by the current sensor 30 (S11), and checks whether the current has changed (S12). When the current changes, the analyzer 100 detects the frequency component (lighting frequency) at which the current value changes (S13).

When the current amplitude of the blinking frequency is equal to or less than a predetermined value, the analyzer 100 determines that the LED lighting device having the blinking frequency is defective (S14).

Before the start of monitoring by the analyzer 100, the blinking frequencies of the plurality of LED lighting devices may be operated as different values from each other. Alternatively, the blinking frequencies of the plurality of LED lighting devices are set to be the same, the blinking frequencies f + Δf that differ based on the variation of each LED lighting device, etc. are measured by the analyzer 100, and f + Δf for each device is stored in the storage device. You may do so. Alternatively, in the total current measurement step S11 of FIG. 9B before the start of monitoring and after the start of monitoring, the blinking frequencies of the plurality of LED lighting devices are the same, and in step S12 of FIG. 9B, the analyzer 100 When a change in current is detected, the analyzer 100 may set different lighting frequencies for the controllers 14 in each LED lighting device via a communication line. Alternatively, the analyzer 100 notifies the management server (not shown) via the communication network, and the management server (not shown) sets different lighting frequencies to the controllers 14 in each LED lighting device via the communication network. You may do so. At that time, the management server (not shown) notifies the analyzer 100 of the blinking frequency of each LED lighting device via the communication network, holds the blinking frequency in the storage device of the analyzer 100, and then causes the analyzer 100 to perform the frequency detection step S13. May be executed. Alternatively, at the start of monitoring in FIG. 9B, immediately before the total current measurement step S11, the analyzer 100 or the management server (not shown) sets the blinking frequencies of the plurality of LED lighting devices to different values. You may do it.

FIG. 10 is a diagram illustrating a method of another embodiment of the present invention, and illustrates an operating procedure of the analyzer 100. In FIG. 10, during monitoring, the analyzer 100 receives the current (instantaneous current) measured by the current sensor 30 (S11), and is the same as in FIG. 9 (B) until it is checked whether the current has changed (S12). is there.

When a change in the current is detected in step S12, the blinking frequencies of the plurality of LED lighting devices may be set to different values to change the dimming (S23).

The dimming of the LED controls the amplitude control that changes the current (forward current) flowing through the LED and the ratio (duty ratio) of the lighting period (see FIG. 3) among the constant frequencies of lighting and non-lighting of the LED. There is a pulse control method that adjusts the brightness. Further, the dimming may be controlled by varying the number of LED groups.

For example, in FIG. 3, assuming that the lighting period of the LED groups A1 to A4 of the LED lighting device A before dimming control is 0.9 ms (millisecond) and the blank period is 100 us (microsecond), the blinking cycle is 1 ms * 4 = 4 ms. (= 250 Hz (Hertz)), and the duty ratio for one LED group is 0.9 / 4 = 0.225. Looking at the four LED groups A1 to A4 in the LED lighting device A, the total lighting time is 0.9 ms * 4 = 3.6 ms, and the overall duty ratio is 3.6 / 4 = 0.9.

As the dimming control, the lighting period of the LED groups A1 to A4 of the LED lighting device A is extended to 1.9 ms, and the blank period is set to 100 us. In this case, the blinking cycle is 2 ms * 4 = 8 ms (= 125 Hz), and the duty ratio for one LED group is 1.9 / 8 = 0.237. Looking at the four LED groups A1 to A4 in the LED lighting device A, the total lighting time is 1.9 ms * 4 = 7.6 ms, and the overall duty ratio is 7.6 / 8 = 0.95. By extending the period about twice, the duty ratio has increased slightly. In the dynamic lighting method, when the lighting time of one LED group is extended, the lighting time of the other LED groups is also extended by the same width, so that the non-lighting time of each LED group is also extended, and as a result, the individual LED groups are extended. Even if the lighting time of the LED is extended about twice, the duty ratio of each LED group and the overall duty ratio do not change so much. Therefore, in addition to the pulse width control, the dimming may be controlled by changing (increasing) the current (forward current) flowing through the LEDs or increasing the number of LEDs. The blinking frequencies of the plurality of LED lighting devices whose dimming is adjusted are set to different values, but preferably, the brightness of the plurality of LED lighting devices is substantially uniform among the plurality of LED lighting devices. It is adjusted to be. That is, for an LED lighting device with a small duty ratio, by increasing the current flowing through the LEDs or increasing the number of LEDs, the LED lighting device with a large duty ratio and the brightness (total luminous flux (lumen), luminosity (candela)) ) Etc.) may be calculated in advance so that they are almost the same.

The analyzer 100 or the management server changes the dimming of the LED group via the controller 14 of each LED lighting device. The analyzer 100 acquires the combined current of a plurality of LED lighting devices whose dimming is changed by the current sensor 30, and responds to the change in dimming by the two-phase lock-in amplifier method described with reference to FIG. When the current amplitude of the blinking frequency corresponding to each LED lighting device is acquired and the current amplitude does not correspond to the increase in the amplitude value corresponding to the increase in dimming, for example (for example, when it is equal to or less than a predetermined value). ), The LED lighting device of the relevant frequency is determined to be defective (S14).

FIG. 11 is a diagram illustrating an example in which the analyzer 100 is configured by the computer 200. Processor (CPU (Central Processing Unit), data processing device) 201, semiconductor memory (for example, RAM (Random Access Memory), ROM (Read Only Memory), or EEPROM (Electrically Erasable and Programmable ROM)), HDD (Hard) It includes a memory 202 including at least one of a Disk Drive), a CD (Compact Disc), a DVD (Digital Versatile Disc), a display (display device) 203, and a communication interface 204. A program that realizes the function of the controller of the analyzer 100 described in the above embodiment is stored in the memory 202, and the processor 201 reads and executes the program, for example, the analyzer 100 of FIG. Each process may be executed.

According to this embodiment, the state of individual LED lighting devices can be monitored with only a small number of current sensors with respect to the number of LED lighting devices. It is possible to grasp the progress of damage of the LED group, and it is easy to set the replacement response time of the LED lighting device.

When an LED lighting device whose operating current is less than a predetermined value is detected, the number of LEDs in the LED lighting device is increased, or the current flowing from the LED driver (constant current circuit) to the LEDs is increased (amplitude control). , Recovery measures such as extending the lighting time may be taken.

The above embodiment is suitable for application to road lighting facilities such as highways and tunnels on general roads, but LED lighting in a lighting system (vehicle or the like) in which a plurality of LED lighting devices are commonly connected to a power supply line. It can be applied to detect defects in equipment.

Further, in the above embodiment, the LED has been described as an example, but the present invention can also be applied to an organic EL (Electro Luminescence) lighting lamp.

The above embodiment is added as follows (but not limited to the following).

(Appendix 1)
For a plurality of lighting devices commonly connected to an AC power supply line, the plurality of lighting devices each having a plurality of light emitting elements.
A frequency detection unit that detects the blinking frequency of the lighting device from the current flowing through the AC power supply line, and
Based on the detected current amplitude of the blinking frequency, a defective lighting device determination unit that determines a defect of the lighting device corresponding to the blinking frequency, and a defective lighting device determination unit.
An analyzer equipped with.

(Appendix 2)
A current monitor unit that monitors the current flowing through the AC power supply line, and
When the current value monitored by the current monitor unit changes by exceeding a predetermined amount of change or change rate, the current change detection unit that detects the change in the current and the current change detection unit
With
When the change in the current is detected by the current change detection unit, the frequency detection unit detects the blinking frequency of the lighting device.
The analyzer according to Appendix 1, wherein the defective lighting device determination unit determines that the lighting device corresponding to the blinking frequency is defective when the current amplitude of the blinking frequency is lower than a predetermined value.
(Appendix 3)
The current monitor unit monitors the current of the AC power supply line in a state where the plurality of lighting devices are operating at different blinking frequencies.
The analyzer according to Appendix 2, wherein the frequency detection unit detects the blinking frequency from the current flowing through the AC power supply line for each blinking frequency of the plurality of lighting devices having different blinking frequencies.

(Appendix 4)
In a state where the plurality of lighting devices are operating at the same blinking frequency, the current monitor unit monitors the current of the AC power supply line.
When the change in the current is detected by the current change detection unit, the plurality of lighting devices are set to different blinking frequencies.
The analyzer according to Appendix 2, wherein the frequency detection unit detects the blinking frequency from the current flowing through the AC power supply line for each blinking frequency of the plurality of lighting devices set to different blinking frequencies. ..

(Appendix 5)
When the change in the current is detected by the current change detection unit, the dimming of the plurality of lighting devices is changed.
The analyzer according to Appendix 2, wherein the defective lighting device determination unit determines that the lighting device corresponding to the blinking frequency is defective when the current amplitude of the blinking frequency does not correspond to the variable portion of the dimming. ..

(Appendix 6)
Each of the lighting devices includes a group of first to Nth (N is an integer of 2 or more) light emitting elements including the plurality of the light emitting elements.
The blinking frequency of the lighting device is the reciprocal of the time period during which the first to Nth light emitting element groups are lit one by one in order and all the first to Nth light emitting element groups are lit. The analyzer according to any one of 1 to 5.

(Appendix 7)
A plurality of lighting devices commonly connected to an AC power supply line, each of which has a plurality of light emitting elements, detects the blinking frequency of the lighting device from the current flowing through the AC power supply line. And
A monitoring method characterized in that a defect determination of the lighting device corresponding to the blinking frequency is performed based on the current amplitude of the blinking frequency.

(Appendix 8)
When the change in the current is detected, the blinking frequency of the lighting device is detected.
The monitoring method according to Appendix 7, wherein when the current amplitude of the blinking frequency is less than a predetermined value, the lighting device corresponding to the blinking frequency is determined to be defective.

(Appendix 9)
The current of the AC power supply line is monitored while the plurality of lighting devices are operating at different blinking frequencies.
The monitoring according to Appendix 8, wherein when a change in the current is detected, the blinking frequency is detected from the current flowing through the AC power supply line for each blinking frequency of the plurality of lighting devices having different blinking frequencies. Method.

(Appendix 10)
While the plurality of lighting devices are operating at the same blinking frequency, the current of the AC power supply line is monitored.
When the change in the current is detected, the plurality of lighting devices are set to different blinking frequencies.
The monitoring method according to Appendix 8, wherein the blinking frequency is detected from the current flowing through the AC power supply line for each blinking frequency of the plurality of lighting devices set to different blinking frequencies.

(Appendix 11)
When the change in the current is detected, the dimming of the plurality of lighting devices is changed.
The monitoring method according to Appendix 8, wherein when the current amplitude of the blinking frequency does not correspond to the variable portion of the dimming, the lighting device corresponding to the blinking frequency is determined to be defective.

(Appendix 12)
A plurality of lighting devices commonly connected to an AC power supply line, each of which has a plurality of light emitting elements, detects the blinking frequency of the lighting device from the current flowing through the AC power supply line. Frequency detection processing and
A program that causes a computer to execute a process of determining a defect of the lighting device corresponding to the blinking frequency based on the current amplitude of the blinking frequency.

(Appendix 13)
A current monitor process that monitors the current flowing through the AC power supply line, and
When the current value monitored by the current monitor unit changes by exceeding a predetermined amount of change or rate of change, the current change detection process for detecting the change in the current and the current change detection process for detecting the change in the current.
When the change in the current is detected, the blinking frequency of the lighting device is detected by the frequency detection process.
The program according to Appendix 12 for causing the computer to execute a process of determining that the lighting device corresponding to the blinking frequency is defective when the current amplitude of the blinking frequency is less than a predetermined value.

(Appendix 14)
In the current monitoring process, the current of the AC power supply line is monitored in a state where the plurality of lighting devices are operating at different blinking frequencies.
When the change in the current is detected, the frequency detection process detects the blinking frequency from the current flowing through the AC power supply line for each blinking frequency of the plurality of lighting devices having different blinking frequencies. , Appendix 13 of the program.

(Appendix 15)
In the current monitoring process, the current of the AC power supply line is monitored while the plurality of lighting devices are operating at the same blinking frequency.
When the change in the current is detected, the plurality of lighting devices are set to different blinking frequencies.
The program according to Appendix 13, wherein the frequency detection process detects the blinking frequency from the current flowing through the AC power supply line for each blinking frequency of the plurality of lighting devices set to different blinking frequencies.

(Appendix 16)
When the change in the current is detected, the dimming of the plurality of lighting devices is changed.
The program according to Appendix 13, wherein when the current amplitude of the blinking frequency does not correspond to the variable portion of the dimming, the lighting device corresponding to the blinking frequency is determined to be defective.

The above disclosure of Patent Documents 1-4 shall be incorporated into this document by citation. Within the framework of the entire disclosure (including the scope of claims) of the present invention, it is possible to change or adjust the embodiments or examples based on the basic technical idea thereof. Further, various combinations or selections of various disclosure elements (including each element of each claim, each element of each embodiment, each element of each drawing, etc.) are possible within the scope of the claims of the present invention. .. That is, it goes without saying that the present invention includes all disclosure including claims, and various modifications and modifications that can be made by those skilled in the art in accordance with the technical idea.

10A-10C LED lighting device 11-1 to 11-n LED group 12 Switch 13 AC-DC converter 14 Controller 15 DC-DC converter 20 AC power supply 21 Power supply line 30 Current sensor 100 Analyzer 101 Current monitor unit 102 Current change detection unit 103 Frequency detection unit 104 Defective LED lighting device Judgment unit 105 Judgment result output unit 111 Reception circuit 112 Controller 113 Storage device 114 Display device 115 Communication device 200 Computer 201 Processor 202 Memory 203 Display 204 Communication interface 301 Magnetic core 302 Hall element 303 Constant current Source 304 Amplifier 305 Feedback winding 306 Shunt resistance 307 ADC
308 transmission circuit
1031 Oscillator 1032 First mixer (mixer 1)
1033 90 degree phase shifter 1034 2nd mixer (mixer 2)
1035 First low-pass filter (LPF1)
1036 Second low-pass filter (LPF2)

Claims (10)

For a plurality of lighting devices commonly connected to an AC power supply line, the plurality of lighting devices each having a plurality of light emitting elements.
A frequency detection unit that detects the blinking frequency of the lighting device from the current flowing through the AC power supply line, and
Based on the detected current amplitude of the blinking frequency, a defective lighting device determination unit that determines a defect of the lighting device corresponding to the blinking frequency, and a defective lighting device determination unit.
An analyzer equipped with. A current monitor unit that monitors the current flowing through the AC power supply line, and
When the current value monitored by the current monitor unit changes by exceeding a predetermined amount of change or change rate, the current change detection unit that detects the change in the current and the current change detection unit
With
When the change in the current is detected by the current change detection unit, the frequency detection unit detects the blinking frequency of the lighting device.
The analyzer according to claim 1, wherein the defective lighting device determination unit determines that the lighting device corresponding to the blinking frequency is defective when the current amplitude of the blinking frequency is lower than a predetermined value. The current monitor unit monitors the current of the AC power supply line in a state where the plurality of lighting devices are operating at different blinking frequencies.
The analyzer according to claim 2, wherein the frequency detection unit detects the blinking frequency from the current flowing through the AC power supply line for each blinking frequency of the plurality of lighting devices having different blinking frequencies. In a state where the plurality of lighting devices are operating at the same blinking frequency, the current monitor unit monitors the current of the AC power supply line.
When the change in the current is detected by the current change detection unit, the plurality of lighting devices are set to different blinking frequencies.
The analysis according to claim 2, wherein the frequency detection unit detects the blinking frequency from the current flowing through the AC power supply line for each blinking frequency of the plurality of lighting devices set to different blinking frequencies. apparatus. When the change in the current is detected by the current change detection unit, the dimming of the plurality of lighting devices is changed.
The analysis according to claim 2, wherein the defective lighting device determination unit determines that the lighting device corresponding to the blinking frequency is defective when the current amplitude of the blinking frequency does not correspond to the variable portion of the dimming. apparatus. Each of the lighting devices includes a group of first to Nth (N is an integer of 2 or more) light emitting elements including the plurality of the light emitting elements.
The blinking frequency of the lighting device is the reciprocal of the time period during which the first to Nth light emitting element groups are lit one by one in order and all the first to Nth light emitting element groups are lit. Item 2. The analyzer according to any one of Items 1 to 5. A plurality of lighting devices commonly connected to an AC power supply line, each of which has a plurality of light emitting elements, detects the blinking frequency of the lighting device from the current flowing through the AC power supply line. And
A monitoring method characterized in that a defect determination of the lighting device corresponding to the blinking frequency is performed based on the current amplitude of the blinking frequency. Monitor the current in the AC power line and
When the change in the current is detected, the blinking frequencies of the plurality of lighting devices set to different blinking frequencies are detected from the current flowing through the AC power supply line.
The monitoring method according to claim 7, wherein when the current amplitude of the blinking frequency is less than a predetermined value, the lighting device corresponding to the blinking frequency is determined to be defective. When the change in the current is detected, the dimming of the plurality of lighting devices is changed.
The monitoring method according to claim 7 or 8, wherein when the current amplitude of the blinking frequency does not correspond to the variable portion of the dimming, the lighting device corresponding to the blinking frequency is determined to be defective. A plurality of lighting devices commonly connected to an AC power supply line, each of which has a plurality of light emitting elements, detects the blinking frequency of the lighting device from the current flowing through the AC power supply line. Frequency detection processing and
A program that causes a computer to execute a process of determining a defect of the lighting device corresponding to the blinking frequency based on the current amplitude of the blinking frequency.

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