JP2021136127A - Lighting device and illuminating device - Google Patents

Abstract

To obtain a lighting device and an illuminating device enabling suppression of difference in brightness of light sources having different luminous efficiencies.SOLUTION: A lighting device according to the present disclosure comprises: a lighting circuit which causes a light source to be lighted; an output terminal portion having a first terminal, a second terminal and a third terminal, and supplying output power of the lighting circuit from the first terminal and the second terminal or the first terminal and the third terminal to the light source; a series circuit which is formed from a first detection resistor and a second detection resistor connected in series, and connects the second terminal and the lighting circuit, and in which a connection point between the first detection resistor and the second detection resistor is electrically connected to the third terminal; and a control unit which controls the lighting circuit in such a way that a voltage generated in the series circuit matches a predetermined target value.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to lighting devices and lighting devices.

Patent Document 1 discloses a lighting device including a constant current power supply, a light emitting module, and a control unit. The light emitting module includes a pair of main terminals that can be connected to a constant current power supply, and one or more light sources that are connected between the pair of main terminals. Further, an information output unit having a resistor for outputting connection information of the light emitting module is connected between the main terminals of the light emitting module. The control unit recognizes the connection information of the light emitting module by the current flowing through the resistor of the information output unit and controls the drive of the constant current power supply.

Japanese Patent No. 5046067

The LED light source of the lighting device may be replaced with an LED light source having improved luminous efficiency. At this time, when the LED forward current set before the replacement flows, the LED light source after the replacement lights up brighter than before the replacement. In order to keep the brightness constant before and after replacement, it is necessary to take measures such as changing the parts of the lighting circuit of the lighting device.

In the lighting device of Patent Document 1, the drive of the constant current power supply can be controlled according to the state of the light emitting module. However, it is not considered to make the brightness constant according to the luminous efficiency. In addition, it is necessary to provide an information output unit in the light emitting module in advance.

The present disclosure has been made in order to solve the above-mentioned problems, and an object of the present disclosure is to obtain a lighting device and a lighting device capable of suppressing a difference in brightness between light sources having different luminous efficiencies.

The lighting device according to the present disclosure has a lighting circuit for lighting a light source, a first terminal, a second terminal, and a third terminal, and the output power of the lighting circuit is the first terminal and the second terminal or the second terminal. The first terminal, the output terminal portion supplied from the third terminal to the light source, and the first detection resistor and the second detection resistor connected in series are formed, and the second terminal and the lighting circuit are connected to each other. A series circuit in which the connection point between the first detection resistor and the second detection resistor is electrically connected to the third terminal, and the lighting so that the voltage generated in the series circuit matches a predetermined target value. It includes a control unit that controls the circuit.

In the lighting device according to the present disclosure, the output power of the lighting circuit can be controlled by supplying the output power of the lighting circuit from the first terminal and the second terminal to the light source and by supplying the output power of the lighting circuit from the first terminal and the third terminal to the light source. The detection resistor that detects the voltage used can be changed. Therefore, when light sources having different luminous efficiencies are used, the difference in brightness can be suppressed by selecting the terminal to be used from the output terminal portions.

It is a figure explaining the structure of the lighting apparatus which concerns on Embodiment 1. FIG. It is a circuit block diagram of the lighting apparatus which concerns on Embodiment 1. FIG. It is a figure explaining the structure of the lighting apparatus which concerns on a comparative example. It is a figure explaining the structure of the output terminal part and the input terminal part at the time of shipment of the lighting apparatus which concerns on Embodiment 1. FIG. It is a figure explaining the structure of the input terminal part at the time of exchanging the light source part which concerns on Embodiment 1. FIG. It is a figure explaining the structure of the input terminal part which concerns on 1st modification of Embodiment 1. FIG. It is a figure explaining the structure of the input terminal part which concerns on the 2nd modification of Embodiment 1. FIG. It is a circuit block diagram at the time of shipment of the lighting apparatus which concerns on Embodiment 2. FIG. It is a circuit block diagram after replacement of the light source part of the lighting apparatus which concerns on Embodiment 2. FIG.

The lighting device and the lighting device according to each embodiment will be described with reference to the drawings. The same or corresponding components may be designated by the same reference numerals and the description may be omitted.

Embodiment 1.
FIG. 1 is a diagram illustrating a configuration of a lighting device 100 according to a first embodiment. The lighting device 100 includes a lighting device 10 and a light source unit 80 having a light source 85. The lighting device 100 is, for example, an exit light fixture.

The lighting device 10 includes a circuit board 11. The circuit board 11 is formed with a lighting circuit and an output terminal portion, which will be described later. The lighting circuit lights the light source 85. The output terminal portion has a first terminal 51, a second terminal 52, and a third terminal 53. The first terminal 51 is electrically connected to the output on the high potential side of the lighting circuit.

The lighting device 10 includes a series circuit 12. The series circuit 12 is formed from a first detection resistor Ra and a second detection resistor Rb connected in series. The series circuit 12 connects the second terminal 52 and the grounding terminal. The ground terminal is electrically connected to the output on the low potential side of the lighting circuit. That is, the series circuit 12 is electrically connected to the output on the low potential side of the lighting circuit. Further, in the series circuit 12, the connection point between the first detection resistor Ra and the second detection resistor Rb is electrically connected to the third terminal 53.

The output terminal unit supplies the output power of the lighting circuit from the first terminal 51 and the second terminal 52 or the first terminal 51 and the third terminal 53 to the light source 85.

One end of the first detection resistor Ra is connected to the control unit. As a result, the control unit detects the voltage generated in the series circuit 12. The control unit according to the present embodiment is a constant current control unit 19, which will be described later. The control unit has, for example, a microcomputer.

The light source unit 80 is, for example, an LED light source module. The light source unit 80 includes a light source substrate 86 and an input terminal unit. A plurality of light sources 85 are mounted on the light source substrate 86. The input terminal portion has a first terminal 81, a second terminal 82, and a third terminal 83. The input terminal unit receives the output power of the lighting circuit from the output terminal unit of the lighting device 10.

A light source 85 is connected between the first terminal 81 and the second terminal 82 or between the first terminal 81 and the third terminal 83. The light source 85 is a light emitting element such as an LED. The plurality of light sources 85 are connected in series. The anode of the light source 85 is connected to the first terminal 81 side, and the cathode is connected to the second terminal 82 and the third terminal 83 side. The light source unit 80 may include one or more light sources 85. Further, the plurality of light sources 85 may be connected in parallel or in series and parallel.

In FIG. 1, the cathode of the light source 85 is connected to the second terminal 82 and the third terminal 83. At the time of use, one of the second terminal 82 and the third terminal 83 is connected to the light source 85, and the other is in an open state.

When the first terminal 51 and the second terminal 52 of the output terminal portions are used, the first terminal 51 and the first terminal 81 are connected, and the second terminal 52 and the second terminal 82 are connected. At this time, the third terminal 53 and the third terminal 83 are in the open state. When the first terminal 51 and the third terminal 53 of the output terminal portions are used, the first terminal 51 and the first terminal 81 are connected, and the third terminal 53 and the third terminal 83 are connected. At this time, the second terminal 52 and the second terminal 82 are in the open state. In this way, the input terminal portion of the light source unit 80 is electrically connected to one of the second terminal 52 and the third terminal 53 and the first terminal 51.

FIG. 2 is a circuit block diagram of the lighting device 100 according to the first embodiment. An external power supply AC is connected to the input side of the lighting device 10 via the input terminal portion CN1. The lighting device 10 is supplied with electric power from the external power supply AC to light the light source 85.

The lighting device 10 includes a lighting circuit 15. The lighting circuit 15 has a rectifier circuit DB1 and an insulated flyback circuit. The rectifier circuit DB1 is also called a diode bridge. The rectifier circuit DB1 rectifies the AC power of the external power supply AC. A capacitor C1 is connected in parallel to the pair of output ends of the rectifier circuit DB1. One end of the primary side of the transformer T1 is connected to the high potential side of the pair of output ends of the rectifier circuit DB1. The other end of the primary side of the transformer T1 is connected to the control unit IC1.

The control unit IC1 is a flyback control IC. The control unit IC1 has a built-in switching element. The switching element included in the control unit IC1 is, for example, a MOSFET (Metal-Oxide-Semiconductor Field-Effective Transistor). The control unit IC1 controls the on / off of the built-in switching element to control the current flowing through the transformer T1.

The anode of the diode D1 is connected to the auxiliary winding on the primary side of the transformer T1. The cathode of the diode D1 is connected to the positive electrode of the control unit IC1 and the capacitor C2. The diode D1 supplies power to the control unit IC1 from the auxiliary winding of the transformer T1. The negative electrode of the capacitor C2 is connected to the grounding terminal.

The power failure detection unit 16 is connected in parallel with the capacitor C1. The cathode of the diode D1 is connected to the power failure detection unit 16.

A photocoupler PC1-1 is connected to the control unit IC1 via a resistor R1. The photocoupler PC1-1 is provided to input information on the secondary side of the transformer T1 to the control unit IC1. A capacitor C3 is connected between the line connecting the resistor R1 and the control unit IC1 and the grounding terminal.

The anode of the diode D2 is connected to one end of the flyback winding on the secondary side of the transformer T1. The diode D2 is provided to transmit a stable voltage to the output side. The positive electrode of the capacitor C4 is connected to the cathode of the diode D2. The negative electrode of the capacitor C4 is connected to the grounding terminal. Further, in the grounding line, the primary side and the secondary side of the transformer T1 are insulated by the capacitor C6.

The anode of the diode D3 is connected to the forward winding output on the secondary side of the transformer T1. A capacitor C5 is connected between the cathode of the diode D3 and the grounding terminal. The first terminal of the switching element Q1 is connected to the cathode of the diode D3 and the positive electrode of the capacitor C5. The switching element Q1 is, for example, a transistor. When the switching element Q1 is a transistor, the first terminal is a collector, the second terminal is an emitter, and the control terminal is a base. The control terminal is a terminal for switching between the first and second terminals.

One end of the resistor R3 is connected to the control terminal of the switching element Q1. The other end of the resistor R3 is connected to one end of the resistor R2 and the control unit IC2. The other end of the resistor R2 is connected to the cathode of the diode D3. A resistor R4 is connected between the first terminal and the second terminal of the switching element Q1.

One end of the resistor R5 and the control unit IC2 are connected to the second terminal of the switching element Q1. The positive electrode of the battery 13 is connected to the other end of the resistor R5. The negative electrode of the battery 13 is connected to the grounding terminal.

The control unit IC2 is a charge control unit. The control unit IC2 detects the voltage across the resistor R5. The control unit IC2 controls the current flowing through the resistor R2 so that the voltage across the resistor R5 matches the target value. As a result, the battery 13 is charged with a constant current. The battery 13 is supplied with a charging current from the forward winding on the secondary side of the transformer T1 via the switching element Q1.

One end of the coil L1 is connected to the positive electrode of the battery 13. The other end of the coil L1 is connected to the anode of the diode D6. The cathode of the diode D6 is connected to the positive electrode of the capacitor C7. The negative electrode of the capacitor C7 is connected to the grounding terminal. Further, the first terminal 51 is connected to the positive electrode of the capacitor C7 via the diode D5.

A switching element Q2 is connected between the connection point of the coil L1 and the diode D6 and the grounding terminal. The first terminal of the switching element Q2 is connected to the anode of the diode D6. The second terminal of the switching element Q2 is connected to the negative electrode of the capacitor C7. The control terminal of the switching element Q2 is connected to the control unit IC3. The switching element Q2 is, for example, a MOSFET. The coil L1, the diode D6, and the switching element Q2 form a booster circuit.

A voltage detection circuit is connected in parallel with the capacitor C7. The voltage detection circuit is composed of a resistor R8 and a resistor R9 connected in series. The voltage detection circuit detects the output voltage of the booster circuit formed by the coil L1, the diode D6, and the switching element Q2. The divided values of the resistors R8 and R9 are input to the control unit IC3. As a result, the control unit IC3 detects the output voltage of the booster circuit. The control unit IC3 turns on / off the switching element Q2 so that the detection voltage of the voltage detection circuit matches a predetermined target value. As a result, the control unit IC3 controls the booster circuit at a constant voltage. The booster circuit boosts the voltage of the battery 13 to light the light source 85 when the external power supply AC has a power failure or the like.

The anode of the diode D4 is connected to the cathode of the diode D2 and the positive electrode of the capacitor C4. The first terminal 51 is connected to the cathode of the diode D4. Further, a constant voltage control unit 17 is connected to the cathode of the diode D2 and the positive electrode of the capacitor C4 via a series circuit of resistors R6 and R7. A photocoupler PC1-2 is connected to the connection points of the resistors R6 and R7.

The constant voltage control unit 17 detects the output voltage on the secondary side of the transformer T1 via the resistors R6 and R7. The constant voltage control unit 17 calculates a target value of the output voltage on the secondary side of the transformer T1 from the detected voltage. The constant voltage control unit 17 transmits the calculated target value from the photocoupler PC1-2 to the primary side of the transformer T1. This target value is transmitted to the control unit IC1 via the photocoupler PC1-1. The control unit IC1 turns on / off the built-in switching element so that the target value and the output voltage on the secondary side of the transformer T1 match. As a result, constant voltage feedback of the insulated flyback circuit is realized.

When there is power supplied from the external power supply AC to the lighting circuit 15, the output voltage on the secondary side of the transformer T1 is supplied to the light source 85 via the diode D4. As a result, the light source 85 is turned on.

A control power generation circuit 18 is connected to the cathode of the diode D2 and the positive electrode of the capacitor C4. The control power supply generation circuit 18 generates power supplies for the constant voltage control unit 17, the control unit IC3, and the constant current control unit 19 from the output voltage on the secondary side of the transformer T1.

The output terminal portion CN2 is a 3-pole connector. The first terminal 51 of the output terminal portion CN2 is electrically connected to the cathode of the diode D4 which is the output on the high potential side of the lighting circuit 15. The second terminal 52 of the output terminal portion CN2 is electrically connected to one end of the first detection resistor Ra and the constant current control unit 19. Further, the third terminal 53 of the output terminal portion CN2 is electrically connected to the other end of the first detection resistor Ra and the other end of the second detection resistor Rb. The third terminal 53 is electrically connected to the grounding terminal via the second detection resistor Rb. A first detection resistor Ra is electrically connected between the second terminal 52 and the third terminal 53. The series circuit 12 connects the second terminal 52 and the lighting circuit 15.

At the time of shipment of the lighting device 100, the light source unit 80 is connected to the first terminal 51 and the third terminal 53. That is, the first terminal 51 and the first terminal 81 are connected, and the third terminal 53 and the third terminal 83 are connected. The second terminal 52 and the second terminal 82 are empty pins. For example, a harness is used to connect the lighting device 10 and the light source unit 80.

At this time, the voltage generated in the second detection resistor Rb corresponds to the light source current flowing through the light source unit 80. The constant current control unit 19 detects the voltage generated in the series circuit 12. As a result, the constant current control unit 19 can detect the voltage generated in the second detection resistor Rb. A predetermined target value is stored in the storage device included in the constant current control unit 19. The constant current control unit 19 controls the lighting circuit 15 so that the voltage generated in the series circuit 12 matches the target value.

The constant current control unit 19 has an integrated circuit such as a microcomputer. Further, the constant current control unit 19 may have a built-in switching element. The switching element incorporated in the constant current control unit 19 is, for example, a MOSFET. The constant current control unit 19 turns on / off the built-in switching element to control the current flowing through the light source 85. The constant current control unit 19 internally sets a target value of the voltage generated in the series circuit 12 in advance. The constant current control unit 19 controls the voltage generated in the series circuit 12 by a microcomputer or the like so that the voltage generated in the series circuit 12 matches the target value. The constant current control unit 19 turns on / off the built-in switching element so that the voltage generated in the series circuit 12 matches the target value. As a result, the light source 85 is turned on under constant current control.

Further, when the light source unit 80 is replaced with a light source unit having higher luminous efficiency, the light source unit is connected to the first terminal 51 and the second terminal 52. At this time, the first terminal 51 and the first terminal 81 are connected, and the second terminal 52 and the second terminal 82 are connected. The third terminal 53 and the third terminal 83 are empty pins. The harness that connects the lighting device 10 and the light source unit is included with the light source board. The harness and light source board are replaced as a set.

At this time, the voltage generated at both ends of the series circuit 12 corresponds to the light source current flowing through the light source unit. The constant current control unit 19 detects the voltage generated in the series circuit 12. The constant current control unit 19 controls the lighting circuit 15 so that the voltage generated in the series circuit 12 matches a predetermined target value. As a result, the light source is turned on by constant current control.

FIG. 3 is a diagram illustrating a configuration of a lighting device 800 according to a comparative example. The lighting device 800 includes a lighting device 810 and a light source unit 880. The lighting device 810 is different from the lighting device 10 in that the third terminal 53 is not provided. That is, the output terminal portion of the lighting device 810 is a two-pole connector. Further, the light source unit 880 does not include the third terminal 83. A detection resistor Rc is connected between the second terminal 52 of the lighting device 10 and the grounding terminal. The lighting device 810 is controlled so that the voltage generated in the detection resistor Rc matches the target value.

In general, LEDs are often used as the light source mounted on the guide light fixture. The life of the LED is, for example, 40,000 to 60,000 hours. When it reaches the end of its life, the light source will be replaced. Generally, the luminous efficiency of an LED light source is improved once every few years. Here, it is considered to replace the LED light source with the LED light source having improved luminous efficiency. At this time, if the constant current control is performed with the same light source current value as before the replacement, the LED light source after the replacement lights up brighter than before the replacement. For example, with a 10% efficiency improvement, the brightness of the light source will increase by 10%. At this time, there is a risk of exceeding the brightness limit value of the guide light display surface defined by JIL5502, which is a technical standard for guide light equipment and equipment for evacuation guidance systems.

On the other hand, in the present embodiment, when the output power of the lighting circuit 15 is supplied to the light source from the first terminal 51 and the second terminal 52, the light source current flows through the first detection resistor Ra and the second detection resistor Rb. At this time, the constant current control unit 19 controls the lighting circuit 15 so that the voltage generated across the series circuit 12 matches the target value.

Further, when the output power of the lighting circuit 15 is supplied to the light source from the first terminal 51 and the third terminal 53, the light source current flows through the second detection resistor Rb. At this time, the constant current control unit 19 controls the lighting circuit 30 so that the voltage generated in the second detection resistor Rb matches the target value. The second detection resistor Rb is one of the first detection resistor Ra and the second detection resistor Rb provided on the lighting circuit 15 side.

As described above, in the present embodiment, there are cases where the output power of the lighting circuit 15 is supplied to the light source from the first terminal 51 and the second terminal 52, and cases where the output power of the lighting circuit 15 is supplied to the light source from the first terminal 51 and the third terminal 53. , The value of the detection resistor for detecting the light source current can be changed. When the target value of the light source current is the same in the constant current control, the larger the detection resistance, the smaller the light source current. Therefore, when light sources having different luminous efficiencies are used, the difference in brightness from that before replacement can be suppressed by selecting the terminal to be used from the second terminal 52 and the third terminal 53. Here, brightness is also called illuminance.

That is, when using a light source having a higher luminous efficiency than before the replacement, the difference in brightness from before the replacement can be suppressed by selecting the terminal of the output terminal portion CN2 whose detection resistance is larger than that before the replacement. ..

For example, it is assumed that the first detection resistor Ra = 1Ω and the second detection resistor Rb = 10Ω. At this time, if the light source unit 80 is connected to the first terminal 51 and the third terminal 53 at the time of initial shipment, the detection resistor for detecting the light source current becomes Rb = 10Ω. Next, the light source unit 80 is replaced with a light source unit having higher luminous efficiency, and a new light source unit is connected to the first terminal 51 and the second terminal 52. At this time, the detection resistor for detecting the light source current is Ra + Rb = 11Ω.

When the target value is the same in the constant current control, the light source current decreases by about 10% when the detection resistance increases by 10%. When the luminous efficiency of the light source unit after replacement is 10% higher than that of the light source unit 80, the increase in brightness due to the luminous efficiency can be canceled by increasing the detection resistance.

On the contrary, when using a light source whose luminous efficiency is lower than that before replacement for some reason, by selecting the terminal of the output terminal CN2 whose detection resistance is smaller than that before replacement, the brightness is higher than that before replacement. The difference can be suppressed.

Further, in the present embodiment, it is not necessary to change the parts of the lighting circuit 15 in order to suppress the change in brightness before and after the replacement of the light source. Therefore, the light source can be easily replaced. Further, it is possible to prevent the brightness of the lighting device 100 from not satisfying the standard such as the brightness limit value of the guide light display surface.

The output terminal portion CN2 is not limited to the 3-pole connector, and may have four or more terminals. When the output terminal portion CN2 has n terminals, the series circuit 12 is formed from m detection resistors connected in series. m = n-1. The second terminal 52 is connected to one end of the series circuit 12, and the output of the lighting circuit 15 is connected to the other end. The connection points of the detection resistors adjacent to each other in the series circuit 12 are connected to any of the terminals of the output terminal portion CN2. In this case, even when the light source is replaced with a light source having high luminous efficiency a plurality of times, the difference in brightness from that before the replacement can be suppressed.

Further, in the present embodiment, the series circuit 12, the second terminal 52, and the third terminal 53 are provided on the low potential side of the pair of power supply lines of the lighting device 10. Not limited to this, the series circuit 12, the second terminal 52, and the third terminal 53 may be provided on the high potential side of the pair of power supply lines. The series circuit 12 may be provided at a portion where the light source current can be detected. That is, the series circuit 12 may connect the output terminal portion CN2 and the lighting circuit 15.

Further, in the present embodiment, even when the light source unit 80 is connected to the first terminal 51 and the third terminal 53, the constant current control unit 19 detects the voltage generated at both ends of the series circuit 12, so that the first terminal 51 and the third terminal 53 are connected to the light source unit 80. 2 The voltage generated in the detection resistor Rb is detected. As a modification of this, the constant current control unit 19 is electrically connected to the connection point between the first detection resistor Ra and the second detection resistor Rb, in addition to the first detection terminal electrically connected to one end of the first detection resistor Ra. It may have a second detection terminal connected to the device. The constant current control unit 19 may directly detect the voltage generated in the second detection resistor Rb by the detection voltage from the second detection terminal.

Further, in the present embodiment, the constant voltage control unit 17, the control unit IC3, and the constant current control unit 19 are separately provided. As a modification of this, a plurality of the constant voltage control unit 17, the control unit IC3, and the constant current control unit 19 may be formed as one control circuit.

FIG. 4 is a diagram illustrating a configuration of an output terminal portion CN2 and an input terminal portion CN3 at the time of shipment of the lighting device 100 according to the first embodiment. In the output terminal portion CN2, the first terminal 51, the second terminal 52, and the third terminal 53 are housed inside the housing 54. A protrusion 55 for preventing erroneous connection is formed inside the housing 54.

The input terminal portion CN3 has a housing 64. A groove 65 that fits with the protrusion 55 is formed in the housing 64. The input terminal portion CN3 is inserted into the housing 54 of the output terminal portion CN2. As a result, the input terminal portion CN3 and the output terminal portion CN2 are electrically connected. At this time, the input terminal portion CN3 covers the first terminal 51, the second terminal 52, and the third terminal 53.

At the time of shipment of the lighting device 100, wirings 61 and 62 electrically connected to the first terminal 81 and the third terminal 83 are connected to the input terminal portion CN3, respectively. The input terminal portion CN3 and the wirings 61 and 62 form a harness. The input terminal portion CN3 is electrically connected to the light source substrate by the wirings 61 and 62. At this time, the second terminal 82 is in the open state.

Further, the housing 54 and the housing 64 are formed with irregularities for preventing erroneous connection. Therefore, it is possible to prevent accidental connection. In particular, the terminals on the high potential side can be reliably connected. Further, the input terminal portion CN3 does not expose the first terminal 51, the second terminal 52, and the third terminal 53 of the output terminal portion CN2. Therefore, it is possible to prevent a person from accidentally touching the terminal.

FIG. 5 is a diagram illustrating a configuration of an input terminal portion CN3 at the time of replacement of the light source portion according to the first embodiment. When replaced with a light source unit having high luminous efficiency, wirings 61 and 62 electrically connected to the first terminal 81 and the second terminal 82 are connected to the input terminal unit CN3, respectively. At this time, the third terminal 83 is in the open state.

Further, when the input terminal portion CN3 shown in FIG. 5 is connected to the output terminal portion CN2 in the opposite direction, the first terminal 81 and the second terminal 82 are connected to the second terminal 52 and the third terminal 53 on the low potential side. NS. Therefore, it is possible to prevent the light source unit from breaking down even when the connection is erroneously connected.

FIG. 6 is a diagram illustrating a configuration of an input terminal portion CN3 according to the first modification of the first embodiment. The harness attached to the light source board may have wirings 61, 62, 63 electrically connected to the first terminal 81, the second terminal 82, and the third terminal 83 of the input terminal portion CN3, respectively. In this case, when connecting the input terminal portion CN3 to the output terminal portion CN2, the user removes the unused wirings 62 and 63.

FIG. 7 is a diagram illustrating a configuration of an input terminal portion CN3 according to a second modification of the first embodiment. The input terminal portion CN3 is electrically connected to one of the second terminal 52 and the third terminal 53 and the first terminal 51 of the output terminal portion CN2. At this time, the input terminal portion CN3 may expose the other of the second terminal 52 and the third terminal 53. The other of the second terminal 52 and the third terminal 53 is a terminal that is in an open state. In the example of FIG. 8, the input terminal portion CN3 covers the first terminal 51 and the second terminal 52 of the output terminal portion CN2, and the third terminal 53 is exposed.

These modifications can be appropriately applied to the lighting device and the lighting device according to the following embodiments. Since the lighting device and the lighting device according to the following embodiments have much in common with the first embodiment, the differences from the first embodiment will be mainly described.

Embodiment 2.
FIG. 8 is a circuit block diagram of the lighting device 200 according to the second embodiment at the time of shipment. In the present embodiment, the configuration of the lighting device 210 is different from that of the lighting device 10 of the first embodiment. The lighting device 210 is supplied with electric power from the external power supply AC to light the light source 85. The lighting device 210 may be connected to a DC power supply. When a DC power supply is connected to the lighting device 210, the rectifier circuit DB and the power supply circuit 20, which will be described later, are not required.

The lighting device 210 includes a rectifier circuit DB, a power supply circuit 20, a lighting circuit 30, and a control unit IC 21. The rectifier circuit DB rectifies the AC power of the external power supply AC.

The power supply circuit 20 is a PFC (Power Factor Direction) circuit. The power supply circuit 20 is also called a power factor improving circuit. The power supply circuit 20 is connected to the output of the rectifier circuit DB. The power supply circuit 20 boosts the pulsating current voltage rectified by the rectifier circuit DB, and charges the electrolytic capacitor C21 with a predetermined high DC voltage. The power supply circuit 20 is a booster circuit such as a booster chopper circuit. The power supply circuit 20 is a switching power supply circuit that generates a voltage across the electrolytic capacitor C21 by turning on / off the first switching element Q21.

In the power supply circuit 20, one end of the coil L21 is connected to the high potential side of the output of the rectifier circuit DB. The drain of the first switching element Q21 and the anode of the first diode D21 are connected to the other end of the coil L21.

The first switching element Q21 is, for example, a MOSFET. The source of the first switching element Q21 is connected to the negative electrode of the electrolytic capacitor C21. The gate of the first switching element Q21 is connected to the MOSFET driver 43. The cathode of the first diode D21 is connected to the positive electrode of the electrolytic capacitor C21.

The negative electrode of the electrolytic capacitor C21 is connected to the low potential side of the output of the rectifier circuit DB. A series circuit of resistors R21 and R22 is connected in parallel with the electrolytic capacitor C21. The connection points of the resistors R21 and R22 are connected to the P1 terminal of the control unit IC21.

The output voltage of the power supply circuit 20 is charged in the electrolytic capacitor C21. The resistors R21 and R22 form a voltage dividing circuit that divides the output voltage of the power supply circuit 20. The voltage across the electrolytic capacitor C21 is divided by the resistors R21 and R22 and input to the control unit IC21. The control unit IC 21 has a storage device. A predetermined voltage target value is stored in the storage device. The control unit IC 21 outputs a switching signal for turning on / off the first switching element Q21 so that the output voltage of the power supply circuit 20 matches the voltage target value.

Here, the output voltage of the microcomputer is generally smaller than the drive voltage of the MOSFET. Therefore, the switching signal from the control unit IC 21 is input to the MOSFET driver 43. The MOSFET driver 43 turns on / off the first switching element Q21 in response to the switching signal. As a result, stable switching can be realized.

A control power supply circuit unit 41 is connected to the output of the power supply circuit 20. The control power supply circuit unit 41 generates the power supply voltage V2 of the MOSFET driver 43 from the output voltage V1 of the power supply circuit 20. Further, a step-down circuit unit 42 is connected to the output of the control power supply circuit unit 41. The step-down circuit unit 42 generates the power supply voltage VDD of the control unit IC21 from the power supply voltage V2. The output of the step-down circuit unit 42 is connected to the VDD terminal of the control unit IC21. A capacitor C22 is connected between the output of the step-down circuit unit 42 and the grounding terminal.

A lighting circuit 30 is connected to the electrolytic capacitor C21. The lighting circuit 30 is supplied with electric power from the electrolytic capacitor C21 to light the light source 85. The lighting circuit 30 is a step-down circuit such as a back converter circuit. In the lighting circuit 30, the drain of the second switching element Q22 is connected to the positive electrode of the electrolytic capacitor C21. The second switching element Q22 is, for example, a MOSFET. The cathode of the second diode D22 and one end of the coil L22 are connected to the source of the second switching element Q22. The gate of the second switching element Q22 is connected to the MOSFET driver 43.

The negative electrode of the electrolytic capacitor C21 and one end of the second detection resistor Rb are connected to the anode of the second diode D22. The positive electrode of the capacitor C23 is connected to the other end of the coil L22. One end of the first detection resistor Ra is connected to the negative electrode of the capacitor C23. The other end of the first detection resistor Ra and the other end of the second detection resistor Rb are connected to each other. Further, one end of the first detection resistor Ra is connected to the P2 terminal of the control unit IC21.

The output terminal portion CN2 is a 3-pole connector. The first terminal 51 of the output terminal portion CN2 is electrically connected to the positive electrode of the capacitor C23, which is the output on the high potential side of the lighting circuit 30. The second terminal 52 of the output terminal portion CN2 is electrically connected to one end of the first detection resistor Ra and the P2 terminal of the control unit IC21. Further, the third terminal 53 of the output terminal portion CN2 is electrically connected to the other end of the first detection resistor Ra and the other end of the second detection resistor Rb. The third terminal 53 is electrically connected to the grounding terminal via the second detection resistor Rb. A first detection resistor Ra is electrically connected between the second terminal 52 and the third terminal 53.

The light source unit 80 is connected in parallel with the series circuit of the capacitor C23 and the first detection resistor Ra. The output voltage of the lighting circuit 30 is smoothed by the capacitor C23 and supplied to the light source unit 80. At the time of shipment of the lighting device 200, the light source unit 80 is connected to the first terminal 51 and the third terminal 53.

At this time, the voltage generated in the second detection resistor Rb corresponds to the light source current flowing through the light source unit 80. The control unit IC 21 detects the voltage generated in the series circuit 12 from the P2 terminal. As a result, the control unit IC21 can detect the voltage generated in the second detection resistor Rb. A predetermined target value is stored in the storage device of the control unit IC21. The control unit IC 21 controls the lighting circuit 30 so that the voltage generated in the series circuit 12 matches the target value.

That is, the control unit IC 21 outputs a switching signal for turning on / off the second switching element Q22 so that the voltage generated in the series circuit 12 matches the target value. Similar to the first switching element Q21, the control unit IC21 turns on and off the second switching element Q22 via the MOSFET driver 43. As a result, the light source 85 is turned on under constant current control.

At the time of initial shipment, the first terminal 51 and the first terminal 81 are connected, and the third terminal 53 and the third terminal 83 are connected. The second terminal 52 and the second terminal 82 are empty pins.

FIG. 9 is a circuit block diagram after replacement of the light source unit 180 of the lighting device 200 according to the second embodiment. In the state shown in FIG. 9, the light source unit 80 is replaced with the light source unit 180 having high luminous efficiency. The light source unit 180 includes a plurality of light sources 185. When the light source unit 180 is replaced, the light source unit 180 is connected to the first terminal 51 and the second terminal 52.

At this time, the voltage generated at both ends of the series circuit 12 corresponds to the light source current flowing through the light source unit 80. The control unit IC 21 detects the voltage generated in the series circuit 12 from the P2 terminal. The control unit IC 21 controls the lighting circuit 30 so that the voltage generated in the series circuit 12 matches a predetermined target value. As a result, the light source 185 is turned on by constant current control.

When the light source unit 180 is replaced, the first terminal 51 and the first terminal 81 are connected, and the second terminal 52 and the second terminal 82 are connected. The third terminal 53 and the third terminal 83 are empty pins.

In the present embodiment, when the output power of the lighting circuit 30 is supplied to the light source from the first terminal 51 and the second terminal 52, the light source current flows through the first detection resistor Ra and the second detection resistor Rb. At this time, the control unit IC 21 controls the lighting circuit 30 so that the voltage generated at both ends of the series circuit 12 matches the target value.

Further, when the output power of the lighting circuit 30 is supplied to the light source from the first terminal 51 and the third terminal 53, the light source current flows through the second detection resistor Rb. At this time, the control unit IC 21 controls the lighting circuit 30 so that the voltage generated in the second detection resistor Rb matches the target value. The second detection resistor Rb is one of the first detection resistor Ra and the second detection resistor Rb provided on the lighting circuit 30 side.

As described above, also in this embodiment, there are cases where the output power of the lighting circuit 30 is supplied to the light source from the first terminal 51 and the second terminal 52, and cases where the output power of the lighting circuit 30 is supplied to the light source from the first terminal 51 and the third terminal 53. The value of the detection resistor for detecting the light source current can be changed with. When the target value of the light source current is the same in the constant current control, the larger the detection resistance, the smaller the light source current. Therefore, when light sources having different luminous efficiencies are used, the difference in brightness from that before replacement can be suppressed by selecting the terminal to be used from the second terminal 52 and the third terminal 53.

The technical features described in each embodiment may be used in combination as appropriate.

10 lighting device, 11 circuit board, 12 series circuit, 13 battery, 15 lighting circuit, 16 power failure detection unit, 17 constant voltage control unit, 18 control power generation circuit, 19 constant current control unit, 20 power supply circuit, 30 lighting circuit , 41 Control power supply circuit, 42 Step-down circuit, 43 MOSFET driver, 51 1st terminal, 52 2nd terminal, 53 3rd terminal, 54 housing, 55 protrusion, 61 wiring, 62 wiring, 64 housing, 65 grooves , 80 light source unit, 81 1st terminal, 82 2nd terminal, 83 3rd terminal, 85 light source, 86 light source board, 100 lighting device, 180 light source unit, 185 light source, 200 lighting device, 210 lighting device, 800 lighting device, 810 lighting device, 880 light source, AC external power supply, C1, C2, C3, C4, C5, C6, C7 capacitor, C21 electrolytic capacitor, C22, C23 capacitor, CN1 input terminal, CN2 output terminal, CN3 input terminal , D1, D2, D3, D4, D5, D6 diode, D21 1st diode, D22 2nd diode, DB, DB1 rectifier circuit, IC1, IC2, IC3, IC21 control unit, L1, L21, L22 coil, PC1-1 , PC1-2 Photocoupler, Q1, Q2 switching element, Q21 1st switching element, Q22 2nd switching element, R1, R2, R3, R4, R5, R6, R7, R8, R9, R21, R22 resistance, Ra 1 detection resistance, Rb 2nd detection resistance, Rc detection resistance, T1 transformer

Claims (7)

A lighting circuit that lights the light source and
An output terminal having a first terminal, a second terminal, and a third terminal, and supplying the output power of the lighting circuit from the first terminal and the second terminal or the first terminal and the third terminal to the light source. Department and
It is formed from a first detection resistor and a second detection resistor connected in series, connects the second terminal and the lighting circuit, and the connection point between the first detection resistor and the second detection resistor is the third terminal. An electrically connected series circuit and
A control unit that controls the lighting circuit so that the voltage generated in the series circuit matches a predetermined target value.
A lighting device characterized by being provided with. When the control unit supplies the output power of the lighting circuit to the light source from the first terminal and the second terminal, the control unit lights the lighting so that the voltage generated at both ends of the series circuit matches the target value. When the circuit is controlled and the output power of the lighting circuit is supplied to the light source from the first terminal and the third terminal, it is provided on the lighting circuit side of the first detection resistor and the second detection resistor. The lighting device according to claim 1, wherein the lighting circuit is controlled so that the voltage generated on the side matches the target value. The first terminal is electrically connected to the output on the high potential side of the lighting circuit.
The lighting device according to claim 1 or 2, wherein the series circuit is electrically connected to an output on the low potential side of the lighting circuit. The lighting device according to any one of claims 1 to 3.
A light source unit having the light source and
A lighting device characterized by being provided with. The light source unit includes an input terminal unit that receives the output power of the lighting circuit from the output terminal unit.
The lighting device according to claim 4, wherein the input terminal portion is electrically connected to one of the second terminal and the third terminal and the first terminal. The lighting device according to claim 5, wherein the input terminal portion covers the first terminal, the second terminal, and the third terminal. The lighting device according to claim 5, wherein the input terminal portion exposes the other of the second terminal and the third terminal.

Images