JP7188624B2 - Lighting devices and luminaires - Google Patents

Description

The present disclosure relates to lighting devices and lighting fixtures.

Patent Literature 1 discloses a discharge lamp lighting device free of power supply voltage, to which a wide range of AC voltages, for example, from 100V to 254V is input. This discharge lamp lighting device can suppress an increase in power consumption even if the voltage value of the input AC voltage increases.

JP-A-2008-61309

Lighting fixtures installed in office buildings, factories, etc. may have different input voltages depending on the location of installation. For this reason, lighting fixtures called power supply voltage free lighting fixtures that can be lit with an input voltage in the range of AC 100V to AC 254V are sometimes used. A lighting fixture with no power supply voltage can be realized by controlling the electric power supplied to the lighting load constant regardless of the input voltage in the internal lighting device.

Generally, in office buildings and the like, both AC100V and AC200V are often supplied to each tenant by single-phase three-wire. In this case, either AC 100V or AC 200V is selected and used for the lighting equipment with no power supply voltage. Generally, AC200V is often used. Assume that the operator intended to wire the lighting equipment so that the input voltage was AC 200V, but the input voltage was mistakenly AC 100V. This occurs, for example, when the wiring is grounded in the middle due to the wiring being pinched or the like. At this time, the lighting fixture lights normally even with an input voltage of AC 100V due to incorrect wiring. For this reason, there is a risk that the operator will not notice the incorrect wiring.

Further, in order to grasp the input voltage to the lighting equipment after the lighting equipment is installed, a measuring device such as a tester is generally required. Therefore, it may take time to grasp the input voltage.

The present disclosure has been made to solve the above-described problems, and an object of the present disclosure is to obtain a lighting device and a lighting fixture with which an input voltage can be easily grasped.

A lighting device according to the present disclosure includes a lighting circuit that receives an input voltage from an external power supply and turns on a light source, a control circuit that controls the lighting circuit, and a voltage detection circuit that detects the input voltage. The control circuit determines that the magnitude of the input voltage supplied from the external power supply is a first voltage, a second voltage, the first voltage, and a It determines which of the voltages other than the second voltage, and outputs the determination result to the notification unit.

In the lighting device according to the present disclosure, the control circuit determines the magnitude of the input voltage according to the signal from the external device, and outputs the determination result to the notification unit. Therefore, the operator can easily grasp the input voltage.

1 is a circuit block diagram of a lighting fixture according to Embodiment 1; FIG. FIG. 4 is a diagram showing another connection method between an external power supply and an input terminal; 4 is a flow chart showing the operation of the control circuit according to the first embodiment; 4 is a flow chart showing the operation of a mode switching unit according to Embodiment 1; 4 is a flow chart showing the operation of a voltage determination unit according to Embodiment 1; FIG. 10 is a circuit block diagram of a lighting fixture according to Embodiment 2; 8 is a flow chart showing the operation of the control circuit according to the second embodiment;

A lighting device, a lighting device, and a lighting fixture according to embodiments of the present disclosure will be described with reference to the drawings. The same reference numerals are given to the same or corresponding components, and repetition of description may be omitted.

Embodiment 1.
FIG. 1 is a circuit block diagram of lighting fixture 1 according to Embodiment 1. As shown in FIG. A lighting fixture 1 includes an input terminal 3 , a lighting device 10 and a light source 4 .

The lighting fixture 1 is supplied with an input voltage Vi from an external power supply. The external power supply is a single-phase three-wire power supply that is a commercial power supply. The external power supply comprises two power supplies AC connected in series. The voltage of each power supply AC is AC100V. A neutral point N for grounding is provided at the connection point of the two power sources AC. An external power supply supplies a first voltage and a second voltage. The first voltage is 100V AC and the second voltage is 200V AC.

The input terminal 3 of the lighting fixture 1 includes a high potential side terminal 3a and a low potential side terminal 3b. Two power sources AC are connected between the high potential side terminal 3a and the low potential side terminal 3b. Therefore, AC 200V is applied to the input terminal 3 of the lighting fixture 1 . In addition, the outer shell of the lighting fixture 1 is connected to the grounding terminal and has the same potential as the neutral point N.

The external power supply and the lighting fixture 1 are connected by a switch SW2. It is desirable that the switch SW2 be a double-ended power switch. Switch SW2 is, for example, a wall switch. The switch SW2 may be a switch mounted indoors. The switch SW2 has a switch La and a switch Lb. The switch La connects the high potential side terminal 3a and the external power supply. The switch Lb connects the low potential side terminal 3b and the external power supply. The voltages between the switch La and the neutral point N and between the neutral point N and the switch Lb are AC 100V, respectively.

The light source 4 includes a plurality of LEDs 4a connected in series. A light source 4 is a lighting load. Although two LEDs 4a are illustrated in FIG. 1, the number of LEDs 4a included in the light source 4 may be other than this. Also, a plurality of LEDs 4a may be connected in parallel or in series-parallel.

The lighting device 10 has an input terminal 13 and an output terminal 16 . Input terminal 13 is connected to input terminal 3 . The output terminal 16 is connected with the light source 4 . A rectifying circuit 11 is connected to an input terminal 13 of the lighting device 10 . The rectifier circuit 11 rectifies an AC voltage input from an external power supply via the input terminal 13 . The rectifier circuit 11 is a bridge rectifier circuit or the like. The rectifier circuit 11 may include a circuit that generates a DC voltage, such as a boost chopper circuit.

A voltage detection circuit 12 is connected to the output of the rectifier circuit 11 . A voltage detection circuit 12 detects an input voltage Vi to the lighting device 10 from an external power supply. The input voltage Vi is the voltage applied to the input terminal 3 or the input terminal 13 . The voltage detection circuit 12 includes resistors 12a and 12b connected in series. A series circuit of the resistors 12 a and 12 b has one end connected to the high potential side output of the rectifier circuit 11 and the other end connected to the low potential side output of the rectifier circuit 11 . A connection point between the resistors 12 a and 12 b is connected to the control circuit 17 . A detection voltage Vp, which is the voltage at the connection point of the resistors 12 a and 12 b, is input to the control circuit 17 . The voltage detection circuit 12 is a voltage dividing circuit in which a voltage obtained by rectifying the input voltage Vi is divided by resistors 12a and 12b.

A lighting circuit 15 is connected to the voltage detection circuit 12 on the side opposite to the rectification circuit 11 . The lighting circuit 15 is supplied with an input voltage Vi from an external power source to light the light source 4 . The lighting circuit 15 comprises a switching element 15a, a diode 15b, a coil 15c and a capacitor 15d. The drain of the switching element 15a is connected to the output of the rectifier circuit 11 on the high potential side. The source of the switching element 15a is connected to the cathode of the diode 15b and one end of the coil 15c. A gate of the switching element 15 a is connected to the switching element driver 14 .

The anode of the diode 15b is connected to the output of the rectifier circuit 11 on the low potential side. The other end of the coil 15c is connected to the positive electrode of the capacitor 15d. The negative electrode of the capacitor 15d is connected to the output of the rectifier circuit 11 on the low potential side. The output voltage of the lighting circuit 15 is applied across the capacitor 15d. The output voltage of lighting circuit 15 is supplied to light source 4 via output terminal 16 .

The lighting circuit 15 lights the light source 4 when the input voltage Vi is in the range of AC100V to AC254V. The lighting circuit 15 lights the light source 4 regardless of whether the input voltage Vi is the first voltage or the second voltage. The lighting circuit 15 is free of power supply voltage. The lighting circuit 15 is not limited to this, and the lighting circuit 15 may correspond to the range of the input voltage Vi of AC100V to AC200V. In this embodiment, lighting circuit 15 is a step-down converter circuit.

The lighting device 10 has a detection resistor Rd. The detection resistor Rd is connected between the low potential side of the output terminal 16 and the negative electrode of the capacitor 15d. A voltage Vr corresponding to the light source current flowing through the light source 4 is applied to the detection resistor Rd. Voltage Vr is input to control circuit 17 .

The lighting device 10 includes a control circuit 17 that controls the lighting circuit 15 . The control circuit 17 is, for example, a microcomputer. The control circuit 17 outputs a dimming signal Vu for switching the switching element 15a. Generally, the voltage of the dimming signal Vu is lower than the driving voltage of the switching element 15a. For this reason, the dimming signal Vu is input to the switching element driver 14, and causes the switching element 15a to perform switching operation via the switching element driver 14. FIG.

The operation modes of the control circuit 17 include a steady operation mode and a voltage determination mode. The control circuit 17 has a mode switching section 17a. The mode switching unit 17a switches the state of the control circuit 17 between the steady operation mode and the voltage determination mode according to a signal from an external device. The mode switching unit 17a is a mode switching switch that switches the operation mode of the control circuit 17 according to a signal from an external device.

In this embodiment, the external device is the switch SW2. The mode switching unit 17 a detects the intermittent of the input voltage Vi due to the pullless operation from the detected voltage Vp of the voltage detection circuit 12 . Here, the pullless operation is an operation to turn on/off the switch SW2 within a certain period of time, as will be described later. When the pullless operation is detected, the mode switching unit 17a sets the state of the control circuit 17 to the voltage determination mode.

The control circuit 17 also has a dimming signal output section 17b. When the control circuit 17 is in the steady operation mode, the dimming signal output unit 17b outputs the dimming signal Vu to the lighting circuit 15 so that the dimming rate of the light source 4 matches the target value.

Further, the control circuit 17 has a voltage determination section 17c. The voltage determination unit 17c determines the magnitude of the input voltage Vi from the external power supply from the voltage Vp detected by the voltage detection circuit 12 when the control circuit 17 is in the voltage determination mode. The voltage determination unit 17c determines whether the input voltage Vi is the first voltage or the second voltage. The voltage determination unit 17c includes, for example, a comparator that compares the input voltage Vi with the first voltage and the second voltage.

The mode switching unit 17a stops the voltage determination unit 17c when the control circuit 17 is in the steady operation mode, and activates the voltage determination unit 17c when the control circuit 17 is in the voltage determination mode. That is, the mode switching unit 17a transmits a pullless operation determination signal to the voltage determination unit 17c when detecting a pullless operation within a certain period of time. This activates the voltage determination unit 17c.

The voltage determination unit 17c outputs the determination result of the input voltage Vi to the notification unit. The notification unit notifies the operator of the determination result. In this embodiment, the notification section includes a light source 4 .

FIG. 2 is a diagram showing another connection method between the external power supply and the input terminal 3. As shown in FIG. In this way, construction work may be performed in which AC 100 V is applied to the input terminal 3 by single-phase two-wire.

Next, the operation of the lighting fixture 1 will be described with reference to FIGS. 3 to 5. FIG. FIG. 3 is a flow chart showing the operation of the control circuit 17 according to the first embodiment. First, the switch SW2 is turned on to start supplying power to the lighting fixture 1 . When the power is turned on, the input voltage Vi of AC 200V is supplied from the input terminal 3 to the lighting fixture 1 .

The rectifier circuit 11 smoothes the input voltage Vi after full-wave rectification. This converts the input voltage Vi into direct current. A part of this DC voltage is divided and supplied to the control circuit 17 as the control power supply Vdd. When the control power supply Vdd is applied to the control circuit 17, the control circuit 17 is initialized as shown in step S1. When the control circuit 17 is initialized, it is set to the steady operation mode as shown in step S2. In the steady operation mode, the control circuit 17 normally lights the light source 4, as shown in step S3.

Next, the operation of the control circuit 17 for normally lighting the light source 4 in the steady operation mode in step S3 will be described. The control circuit 17 outputs a dimming signal Vu to control the lighting circuit 15 . The dimming signal Vu is a DC signal that turns on and off the switching element 15a with a High signal and a Low signal. The High time of the dimming signal Vu corresponds to the ON time of the switching element 15a.

The dimming signal output section 17b detects the light source current from the voltage Vr. The light source current corresponds to the dimming rate. The dimming signal output unit 17b outputs the dimming signal Vu based on the voltage Vr so that the light source 4 is lit with a preset brightness. For example, if the target value of the dimming rate is 80%, the dimming signal output unit 17b outputs the dimming signal Vu so that the dimming rate becomes 80%. When the dimming rate is lower than the target value, the dimming signal output unit 17b lengthens the High time of the dimming signal Vu. Also, the higher the input voltage Vi, the shorter the High time of the dimming signal Vu.

As described above, by adjusting the ON time of the switching element 15a, constant current control is performed so that the current supplied from the lighting circuit 15 to the light source 4 is constant regardless of the magnitude of the input voltage Vi. The control circuit 17 may receive a PWM signal or a signal transmitted by digital communication from outside the lighting device 10 . In this case, the control circuit 17 may output the dimming signal Vu according to the duty ratio of the signal input from the outside.

During normal lighting, the mode switching unit 17a detects the presence or absence of a pullless operation, as shown in step S4. FIG. 4 is a flow chart showing the operation of the mode switching unit 17a according to the first embodiment. The pullless operation is an operation of intermittently interrupting the input voltage Vi in a short period of time. The pullless operation in this embodiment refers to switching the switch SW2 between ON, OFF, and ON within three seconds, for example.

The mode switching unit 17a takes in the detected voltage Vp of the voltage detection circuit 12 and determines whether or not there is a pullless operation. The mode switching unit 17a A/D converts the detected voltage Vp. Thereby, the mode switching unit 17a detects the detection voltage Vp, which is a DC voltage corresponding to the input voltage Vi. For example, when AC254V is input to the input terminal 13, the detected voltage Vp=15V. When AC200V is input to the input terminal 13, the detected voltage Vp=11.8V. When 100V AC is input to the input terminal 13, the detected voltage Vp=5.9V. The resistance values of the resistors 12a and 12b are set so that the detection voltage Vp has the above value with respect to the input voltage Vi.

The mode switching unit 17a reads the A/D converted value of the detected voltage Vp at regular sampling intervals. A sampling time is, for example, 10 ms. Here, when the input voltage Vi is interrupted by the pullless operation, the A/D conversion value switches between a Low signal and a High signal along with time transition. Here, the Low signal is 0V. Further, intermittent input voltage Vi means that the power is turned off from the power-on state, and then turned on again immediately after that. At this time, the value read by the mode switching unit 17a switches in the order of High signal, Low signal, and High signal.

As shown in step S21, it is assumed that the mode switching unit 17a detects a fall from a high signal to a low signal accompanying a change of the input voltage Vi from on to off. At this time, as shown in step S22, the mode switching unit 17a activates the pullless timer. As shown in step S25, the pullless timer counts the determination time. The determination time is, for example, 3 seconds.

Next, as shown in step S23, while the pullless timer is running, it is assumed that the mode switching unit 17a detects a rise from the Low signal to the High signal, which is the change when the power is turned on. When the mode switching unit 17a detects that the power is turned on again during the determination time, the mode switching unit 17a determines that there is a pullless operation, as shown in step S24. When the mode switching unit 17a determines that there is a pullless operation, the state of the control circuit 17 transitions from the steady operation mode to the voltage determination mode as shown in step S5 of FIG.

After starting the pull-less timer, if no rise is detected even after the determination time has elapsed, the mode switching unit 17a stops the pull-less timer as shown in step S26. At this time, as shown in step S2 of FIG. 3, the mode switching unit 17a sets the control circuit 17 to the steady operation mode.

Next, the voltage determination mode will be explained. In the voltage determination mode, the voltage determination section 17c is activated. As shown in step S6, the voltage determination unit 17c determines the magnitude of the input voltage Vi based on the A/D conversion value of the detected voltage Vp.

FIG. 5 is a flow chart showing the operation of the voltage determining section 17c according to the first embodiment. As shown in steps S31 to S34, the voltage determination unit 17c compares the A/D conversion value with four thresholds. The four thresholds are stored in advance in the voltage determination section 17c. As a result, it is determined which of the three types of voltage, ie, 200 VAC, 100 VAC, and other voltages, the input voltage Vi is.

Considering the voltage fluctuation of the commercial power supply, the threshold for determining the input voltage Vi of 200 V AC is set to the A/D conversion value corresponding to Vp = 11.8 V ± 10% when determining the input voltage Vi of 100 V AC. is set to an A/D conversion value corresponding to Vp=5.9V±10%.

First, as shown in step S31, the voltage determination unit 17c determines whether the input voltage Vi is AC200V+10% or less. When the input voltage Vi is greater than AC200V+10%, it is determined that the input voltage Vi is a voltage other than AC200V and AC100V. When the input voltage Vi is 200 VAC+10% or less, the voltage determination unit 17c determines whether the input voltage Vi is 200 VAC−10% or more, as shown in step S32. If the input voltage Vi is AC200V-10% or more, it is determined that the input voltage Vi is AC200V.

When the input voltage Vi is lower than AC200V-10%, the voltage determination unit 17c determines whether the input voltage Vi is AC100V+10% or less, as shown in step S33. When the input voltage Vi is greater than AC100V+10%, it is determined that the input voltage Vi is a voltage other than AC200V and AC100V. When the input voltage Vi is AC100V+10% or less, the voltage determination unit 17c determines whether the input voltage Vi is AC100V-10% or more, as shown in step S34. If the input voltage Vi is AC100V-10% or more, the input voltage Vi is determined to be AC100V. If the input voltage Vi is less than AC100V-10%, it is determined that the input voltage Vi is a voltage other than AC200V and AC100V.

Note that the voltage value of the commercial power supply may fluctuate. Therefore, the input voltage Vi may be affected by voltage fluctuations. The voltage determination unit 17c may acquire the detected voltage Vp multiple times and determine the magnitude of the input voltage Vi when all of the multiple detected voltages Vp have the same value. For example, the voltage determination unit 17c may acquire the A/D converted value of the detected voltage Vp three times, and if the same value is obtained three times in succession, the voltage determination may be performed using the acquired value. From the above, it is possible to suppress the influence of voltage fluctuations and determine the input voltage Vi more accurately.

After determining the input voltage Vi, the control circuit 17 shifts to the notification operation shown in step S7. In the notification operation, the voltage determination unit 17c controls the lighting circuit 15 according to the determination result to change the lighting state of the light source 4. FIG. First, the voltage determination unit 17c outputs a light control pattern according to the determination result to the light control signal output unit 17b. The dimming signal output unit 17b outputs a dimming signal Vu for lighting the light source 4 in a lighting pattern different from normal lighting according to the lighting pattern.

An example of a lighting pattern different from normal lighting will be described. When the input voltage Vi is determined to be 100 V AC, the control circuit 17 outputs the dimming signal Vu so that the light source 4 blinks. Further, when the input voltage Vi is determined to be 200 V AC, the control circuit 17 outputs the dimming signal Vu so that the light source 4 is lit at the lower limit. Here, the lower limit lighting is a lighting state in which the dimming rate is lower than that of normal lighting. If the input voltage Vi is determined to be any other voltage, the control circuit 17 outputs the dimming signal Vu to turn off the light source 4 . Table 1 shows the lighting pattern of the above notification operation.

As described above, the light source 4 is lit in a lighting state different from usual by the notification operation. This allows the operator to easily grasp the input voltage Vi. Also, the worker can know the input voltage Vi by using the function of the installed lighting fixture 1 . Therefore, it is possible to easily check whether there is wiring abnormality after installation without using a measuring device such as a tester.

Here, it is assumed that the power line on the Lb side touches the metal part of the outer shell of the lighting fixture 1 or the like. In this case, the power line may be grounded. At this time, even if it is assumed that 200V AC is connected to the input terminal 3, the voltage input to the lighting device 10 is 100V AC. As described above, the lighting device 10 is lit even at AC 100V. Therefore, if the breaker in the building where the lighting device 1 is installed does not trip due to a ground fault, the operator may not notice the abnormal state.

Similarly, even if AC 100 V is input to the lighting device 10 due to a wiring error, it is difficult to notice the wiring error only by testing the normal lighting of the light source 4 . Since the outer shell of the lighting fixture 1 is grounded, even if a worker touches the outer shell of the lighting fixture 1, an electric shock or the like can be prevented. However, the lighting device 1 is in a state different from the usage state intended by the user. For this reason, there is a possibility that a problem may occur in the lighting fixture 1 or in the external wiring.

On the other hand, in the lighting fixture 1 of the present embodiment, the input voltage Vi is determined by the pullless operation of the switch SW2. The lighting pattern corresponding to the determination result allows the operator to easily check the input voltage Vi.

If the determination result is different from the intended voltage, the operator checks the wiring state, for example, in the following procedure. First, the line voltage between the high potential side terminal 3a and the low potential side terminal 3b is measured. Alternatively, the line voltage of the input terminal 13 may be measured. If the measured line voltage is different from the intended input voltage Vi, the voltage of the wiring between the switch SW2 and the input terminal 3 and the line voltage of the switch SW2 are measured. Next, the breaker of the external power supply is turned off, and the ground connection of the lighting fixture 1 and the ground connection of the neutral point N are checked.

Further, after the above wiring confirmation is completed, the input voltage Vi judgment function becomes unnecessary. Therefore, after confirming the input voltage Vi, the pullless operation by the switch SW2 may be assigned to another function. As another function, for example, the light control rate of the light source 4 may be changed to a predetermined light control rate by pullless operation.

As a method of allocating the pullless operation to another function, the lighting device 10 may be provided with an invalidation switch SW3 for invalidating the pullless operation with respect to the determination of the magnitude of the input voltage Vi by the control circuit 17 and the output of the determination result. . Disable switch SW3 may be, for example, a jumper switch. In this case, by inserting a jumper pin into the jumper switch, the pullless operation can be assigned to another function. It is not limited to this, and a special operation or the like for complicated power supply intermittence may be used.

By assigning the pullless operation to another function, even if the user unintentionally performs the pullless operation, it is possible to prevent the notification operation from occurring. Therefore, it is possible to prevent the user from falling into an unintended lighting state.

The operator of the present embodiment includes all persons who perform pullless operation. For example, the worker may be a construction worker who installs the lighting fixture 1, a user of the lighting fixture 1, or a user of the building in which the lighting fixture 1 is installed.

Further, in the present embodiment, the control circuit 17 includes the mode switching section 17a, the dimming signal output section 17b, and the voltage determination section 17c separately. Alternatively, the mode switching unit 17a, the dimming signal output unit 17b, and the voltage determination unit 17c may be integrated. As the control circuit 17, any circuit that determines the magnitude of the input voltage Vi from the voltage Vp detected by the voltage detection circuit 12 according to a signal from an external device and outputs the determination result to the notification unit can be employed.

The control circuit 17 may be dedicated hardware or may be a CPU (Central Processing Unit) that executes a program stored in a memory. A CPU is also called a central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, DSP.

If the control circuit 17 is dedicated hardware, the control circuit 17 may be, for example, a single circuit, multiple circuits, a programmed processor, a parallel programmed processor. Also, the control circuit 17 may be an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array). Furthermore, the control circuit 17 may be a combination of these. The functions of the mode switching unit 17a, the dimming signal output unit 17b, and the voltage determination unit 17c may be implemented by control circuits. Also, the functions of the respective units may be collectively realized by the control circuit 17 .

When the control circuit 17 is a CPU, the functions of the mode switching section 17a, the dimming signal output section 17b, and the voltage determination section 17c are implemented by software, firmware, or a combination of software and firmware. Software and firmware are written as programs and stored in memory. The control circuit 17 realizes the function of each section by reading out and executing a program stored in the memory.

That is, the control circuit 17 determines the magnitude of the input voltage Vi from the voltage Vp detected by the voltage detection circuit 12 according to the signal from the external device, and outputs the determination result to the notification unit. Prepare. It can also be said that these programs cause a computer to execute the procedures or methods of the mode switching section 17a, the dimming signal output section 17b, and the voltage determination section 17c.

Here, the memory corresponds to, for example, non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, EEPROM, magnetic disk, flexible disk, optical disk, compact disk, mini disk, DVD, and the like. RAM is an abbreviation for Random Access Memory. ROM is an abbreviation for Read Only Memory. EPROM is an abbreviation for Erasable Programmable Read Only Memory. EEPROM is an abbreviation for Electrically Erasable Programmable Read-Only Memory.

Note that the functions of the mode switching unit 17a, the dimming signal output unit 17b, and the voltage determination unit 17c may be partly implemented by dedicated hardware and partly implemented by software or firmware. For example, the function of the mode switching unit 17a and the voltage determination unit 17c is realized by the control circuit 17 as dedicated hardware, and the dimming signal output unit 17b is read by the control circuit 17 reading out a program stored in the memory. It is possible to realize the function by executing it.

Thus, the control circuit 17 can implement each of the functions described above by means of hardware, software, firmware, or a combination thereof.

Also, in the present embodiment, the light source 4 is used as the notification unit, but other notification units may be used as long as they can notify the operator of the determination result.

Further, in this embodiment, the external power supply is assumed to be a single-phase three-wire power supply. This embodiment is not limited to this, and the present embodiment can be applied as long as the external power source is a power source that supplies voltages of a plurality of magnitudes. Also, even if the external power supply is a power supply that supplies a single voltage, the present embodiment can be applied to check for wiring abnormalities.

Further, in the pullless operation of the present embodiment, the switch SW2 is turned on, off, and on within three seconds. The pull-less operation is not limited to this, and may be any operation that turns the switch SW2 on or off multiple times within a certain period of time.

These modifications can be appropriately applied to lighting devices and lighting fixtures according to the following embodiments. Note that the lighting device and the lighting fixture according to the following embodiment have many points in common with the first embodiment, so the explanation will focus on the points of difference from the first embodiment.

Embodiment 2.
FIG. 6 is a circuit block diagram of lighting fixture 201 according to Embodiment 2. As shown in FIG. A lighting fixture 201 of the present embodiment includes a lighting device 210 . The lighting device 210 has an extension terminal 218 for connecting an external device. The lighting device 210 also includes a control circuit 217 . The control circuit 217 further includes a mode switching section 217d in addition to the configuration of the first embodiment. Other configurations are the same as those of the first embodiment.

In this embodiment, the external device is the confirmation unit 219 . Confirmation unit 219 communicates with control circuit 217 via extension terminal 218 . Moreover, in this embodiment, the notification unit is the confirmation unit 219 . The confirmation unit 219 has a display for displaying the input voltage Vi. The display section is composed of an LED or the like.

The extension terminal 218 is a terminal for connecting a retrofitted extension unit. Optional functions such as dimming control and wireless control can be added to the lighting fixture 1 by the expansion unit. In this embodiment, the input voltage Vi is determined by connecting the confirmation unit 219 to the extension terminal 218 .

The extension terminal 218 is connected to the mode switching section 217 d of the control circuit 17 . The mode switching unit 217d is a communication unit that communicates with the device connected to the extension terminal 218. FIG. The mode switching unit 217d is, for example, a serial interface. The mode switching unit 217 d has at least two communication lines connected to the extension terminal 218 . The two communication lines are a serial data transmission line and a serial data reception line. The mode switching unit 217d performs serial communication with an expansion unit connected to the outside of the lighting device 10 via the expansion terminal 18 .

The mode switching unit 217d determines whether or not the confirmation unit 219 is connected to the extension terminal 218 by a method described later. When the mode switching unit 217d determines that the confirmation unit 219 is connected to the extension terminal 218, it sets the state of the control circuit 217 to the voltage determination mode. The voltage determination unit 17c determines the magnitude of the input voltage Vi from the voltage Vp detected by the voltage detection circuit 12 in the voltage determination mode. The voltage determination section 17 c outputs the determination result to the confirmation unit 219 via the extension terminal 218 . The confirmation unit 219 displays the determination result.

Next, the operation of the lighting fixture 201 of this embodiment will be described. FIG. 7 is a flow chart showing the operation of the control circuit 217 according to the second embodiment. When the switch SW2 is turned on, the lighting fixture 1 is supplied with AC200V. When the control circuit 217 is energized with the control power supply Vdd, the control circuit 217 is initialized as shown in step S1.

Next, as shown in step S208, the mode switching section 217d detects whether or not the confirmation unit 219 is connected. For example, the control circuit 217 determines that some extension unit is connected to the extension terminal 18 by detecting that the communication line of the mode switching section 217d is pulled up. The mode switching unit 217d serially communicates with the expansion unit connected to the expansion terminal 218. FIG. Through this serial communication, the mode switching unit 217d determines that the extension unit connected to the extension terminal 218 is the confirmation unit 219. FIG. As described above, the presence or absence of the confirmation unit 219 can be detected.

If the confirmation unit 219 is connected, the control circuit 217 shifts to the voltage determination mode, as shown in step S5. Steps S5 and S6 are the same as in the first embodiment.

The determination result of the input voltage Vi is transmitted to the confirmation unit 219 by serial communication from the voltage determination section 17c via the mode switching section 217d. As shown in step S209, the confirmation unit 19 notifies the received judgment result by a unit notifying operation to be described later.

Next, it is assumed that the operator removes the confirmation unit 219 without turning off the external power supply after completing the wiring confirmation by the operator. At this time, the operation of step S208 causes the control circuit 217 to switch to the steady operation mode shown in step S2. As a result, the lighting device 210 normally lights the light source 4 as shown in step S3. After the initialization in step S1, the same operation is performed even when the confirmation unit is not attached.

Next, the unit notification operation will be explained. The confirmation unit 219 displays the input voltage Vi on the display. This allows the operator to easily grasp the input voltage Vi. In addition, the operator can know the input voltage Vi of the lighting device 210 even when the light source 4 is not attached to the lighting device 210 . Also, the confirmation unit 219 is removed during normal use of the lighting device 201 . Therefore, it is possible to prevent switching to the voltage determination mode against the user's intention.

The display section of the confirmation unit 19 may be composed of a 7-segment LED or an LED matrix panel. As a result, more detailed voltage determination results can be notified than in the notification by the three types of lighting patterns in the first embodiment. Furthermore, a message prompting confirmation of wiring connection and a specific confirmation method may be displayed on the display unit. As a result, the worker can quickly check the wiring without referring to the manual.

In the first embodiment and the present embodiment, the operator is notified of the input voltage Vi by a change in the light of the notification unit. As a modification, the confirmation unit 219 may notify the determination result by voice. In this case, the confirmation unit 219 incorporates a speaker. This allows the operator to know the input voltage Vi without looking at the light source 4 or the confirmation unit 219 .

Also, the confirmation unit 219 may include a speech synthesis IC. The confirmation unit 219 may notify by voice a message prompting confirmation of the wiring connection and a specific confirmation method along with the determination result. As a result, the operator can be promptly prompted to check the wiring.

In this embodiment, the transition to the voltage determination mode is performed by connecting the confirmation unit 219 to the extension terminal 218 . Alternatively, for example, the switch SW2 may be turned on while a push button switch provided in the lighting device 10 is pressed, thereby transitioning to the voltage determination mode. Also in this case, it is possible to prevent unintentional switching to the voltage determination mode due to an erroneous operation by the user.

Further, in this embodiment, the control circuit 217 includes both the mode switching section 17a and the mode switching section 217d. Therefore, the voltage determination by the pullless operation and the voltage determination by the confirmation unit 219 can be used together. The present embodiment is not limited to this, and the mode switching unit 17a may not be provided.

Further, in FIG. 6, the voltage determination section 17c and the mode switching section 217d transmit and receive signals via the dimming signal output section 17b. Not limited to this, the voltage determination unit 17c and the mode switching unit 217d may directly transmit and receive signals.

Note that the technical features described in each embodiment may be used in combination as appropriate.

Reference Signs List 1, 201 lighting fixture 10, 210 lighting device 4 light source 12 voltage detection circuit 15 lighting circuit 17, 217 control circuit 17a, 217d mode switching unit 17c voltage determination unit 218 extension terminal 219 confirmation unit , AC power supply, SW2 switch, SW3 invalid switch, Vi input voltage, Vp detection voltage

Claims (2)

a lighting circuit that receives an input voltage from an external power source and lights a light source;
a control circuit that controls the lighting circuit;
a voltage detection circuit that detects the input voltage;
with
The control circuit determines, from the voltage detected by the voltage detection circuit in response to a signal from an external device, that the magnitude of the input voltage supplied from the external power supply is a first voltage, a second voltage, and a first voltage. and a voltage other than the second voltage, and outputs the determination result to a notification unit. A lighting fixture comprising the lighting device according to claim 1 and the light source.

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