JP2013089570A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire which restricts flickering of light in illumination.SOLUTION: A luminaire 100 includes: power supply lines 3A, 3B and 3C connected to a power supply terminal 1; light-emitting diodes 4A and 4B inserted in the power supply lines; switches 7A and 7B, connected to the power supply lines on the downstream side of the light-emitting diodes, which switch the light-emitting diodes on and off; capacitors 8A and 8B which are connected in parallel to the switches; bypass lines 103A and 103B which bypass the light-emitting diodes between the power supply terminal and the switches; and a switching section 102 which selectively switches the destination of power fed to the power supply terminal between the power supply lines and the bypass lines. When the light-emitting diodes are turned off, the switching section connects the power supply terminal with the bypass lines.

Description

  The present invention relates to a lighting device.

  Conventionally, a plurality of power supplies that are electrically connected to an external device that detects a predetermined state change corresponding to a display target and supplies power from the power source to the external device in response to the detection of the state change of the external device. There has been a display device including a line and a light-emitting element incorporated in the power supply line so as to be lit by supplying power (see, for example, Patent Document 1).

JP 2006-103666 A

  By the way, the conventional display device includes a power supply cutoff means for cutting off the power supply from the power source to the power supply line over the extinguishing period, and a noise countermeasure capacitor connected in parallel to the transistor for switching on / off of the light emitting diode. With.

  This power supply cutoff means suppresses the flashing of the light emitting diode by setting the period in which the abnormal voltage and abnormal current are generated as the extinguishing period.

  However, since a capacitor is connected in parallel to the light emitting diode, when power is turned off after the extinguishing period by the power supply cut-off means has elapsed, a current for charging the capacitor flows. Even if it is off, there is a possibility that a flashing light emitting diode may occur.

  Then, an object of this invention is to provide the illuminating device which suppressed the flashing of illumination.

  An illumination device according to an aspect of the present invention includes a power supply line connected to a power supply terminal, a light emitting diode inserted into the power supply line, and a power supply line downstream of the light emitting diode. A switch for switching on / off, a capacitor connected in parallel to the switch, a bypass line for bypassing the light emitting diode between the power supply terminal and the switch, and a power input to the power supply terminal A switching unit that selectively switches a supply destination to the power supply line or the bypass line, and the switching unit connects the power supply terminal and the bypass line when the light emitting diode is turned off.

  A lighting device according to another aspect of the present invention includes a power supply line connected to a power supply terminal, a light emitting diode inserted into the power supply line, a power supply line connected to the power supply line downstream of the light emitting diode, and the light emission. A switch for switching on / off of a diode; a capacitor connected in parallel to the switch; and a transistor inserted into the power supply line between the power supply terminal and the light emitting diode, and emitting light of the light emitting diode At the start, the transistor is pulsed.

  According to the present invention, it is possible to provide an illumination device that can suppress a flashing of illumination.

It is a figure which shows the circuit structure of the illuminating device of a comparative example. FIG. 3 is a diagram illustrating a circuit configuration of the illumination device according to the first embodiment. FIG. 6 is a diagram illustrating an operation of the illumination device 100 according to the first embodiment. FIG. 3 is a diagram illustrating a circuit configuration of the illumination device according to the first embodiment. It is a figure which shows operation | movement of the illuminating device 200 of Embodiment 2. FIG.

  Before describing the embodiment to which the lighting device of the present invention is applied, problems that may occur in the lighting device of the comparative example will be described with reference to FIG.

  FIG. 1 is a diagram illustrating a circuit configuration of a lighting device of a comparative example.

  The lighting device 10 of the comparative example includes, as main components, a power supply terminal 1, a fuse 1A, a relay 2, power supply lines 3A, 3B, and 3C, LEDs (Light Emitting Diodes) 4A and 4B, a lamp 5, and lighting. It includes a state switching unit 6, switches 7A, 7B, 7C and 7D, and capacitors 8A and 8B.

  The illuminating device 10 is arrange | positioned in the vehicle interior of a vehicle, for example. Here, a case will be described in which the switches 7A, 7B, and 7D are npn-type transistors, and the switch 7C is an N-type MOSFET (Metal Oxide Semiconductor Field Effect Transistor).

  The power supply terminal 1 is a terminal that is connected to a vehicle battery and receives DC power from the battery. The power supply terminal 1 is connected to the relay 2 via the fuse 1A. The fuse 1A is inserted to prevent an overcurrent between the power supply terminal 1 and the relay 2.

  The relay 2 has a contact 2A and a coil 2B. The contact 2A is inserted between the fuse 1A and the power supply lines 3A to 3B. The coil 2B is provided to drive the contact 2A and is connected to the collector of the switch 7D.

  The coil 2B is driven by switching a voltage input to the base of the switch 7D, and switches the contact 2A to a conductive state or a non-conductive state. If the contact 2A is in a conducting state, the relay 2 is on, and if the contact 2A is in a non-conducting state, the relay 2 is off. When the relay 2 is turned on, the power supply terminal 1 and the power supply lines 3A to 3B are electrically connected.

  One end of each of the power supply lines 3A, 3B, and 3C is connected to the contact 2A of the relay 2, and is connected in parallel to each other. The LED 4A is inserted into the power supply line 3A, and the LED 4B is inserted into the power supply line 3B. Further, the lamp 5 and the lighting state switching unit 6 are inserted into the power supply line 3C.

  The other end of the power supply line 3A is connected to the collector of the switch 7A and one end of the capacitor 8A. The other end of the power supply line 3B is connected to the collector of the switch 7B and one end of the capacitor 8B. The other end of the power supply line 3C is connected to the drain of the switch 7C.

  The LEDs 4A and 4B are inserted into the power supply lines 3A and 3B, respectively. LED4A, 4B is arrange | positioned as illumination in a vehicle interior, for example, and is used for room lamp, floor light, meter illumination, console illumination, etc., for example. The LEDs 4A and 4B are inserted into the power supply lines 3A and 3B together with a resistor for resistance adjustment.

  The lamp 5 is inserted in the power supply line 3C. The lamp 5 is used, for example, as a room lamp or a floor light in the vehicle interior.

  The lighting state switching unit 6 is inserted into the power supply line 3 </ b> C on the downstream side of the lamp 5. The lighting state switching unit 6 has four contacts 6A, 6B, 6C, and 6D. The contact 6 </ b> A is connected to the lamp 5. The contact 6B is held at a floating potential, and when the contact 6A is connected to the contact 6B, the lamp 5 is held in an extinguished state (always off) even when the relay 2 is turned on.

  The contact 6C is connected to the drain of the switch 7C. When the contact 6A is connected to the contact 6C, the lamp 5 is turned on by turning on the switch 7C when the relay 2 is turned on. For example, if the switch 7C is interlocked with a sensor that detects opening and closing of a vehicle door so that the switch 7C is turned on when the door is opened, the contact 6A and the contact 6C are connected, When the door is opened, the lamp 5 is turned on (door-linked lighting).

  The contact 6D is grounded. When the contact 6A and the contact 6D are connected while the relay 2 is on, the lamp 5 is lit (always lit).

  As described above, the lighting state switching unit 6 switches and sets the lighting state of the lamp 5 to any one of always-off, door-linked lighting, or always-on. The lighting state switching unit 6 is configured to be switched manually, for example, so that the user of the vehicle can select. In addition, always-off, door-linked lighting, or always-on is an example of a lighting state, and other lighting states may be included, and there are only two of any one of normally-off, door-linked lighting, or always-on. May be.

  The switches 7A and 7B are connected to the downstream ends of the power supply lines 3A and 3B, respectively. The switches 7A and 7B are composed of, for example, npn type transistors, the collectors are connected to the power supply lines 3A and 3B, and the emitters are grounded.

  The bases of the switches 7A and 7B are connected to an ECU (Electric Control Unit) for illumination, and a PWM (Pulse Width Modulation) voltage is input to the bases. On / off is performed according to the duty ratio. If the switches 7A and 7B are turned on while the relay 2 is on, the LEDs 4A and 4B are lit.

  The switch 7C is connected to the downstream end of the power supply line 3C. The switch 7C is connected to the contact 6C of the lighting state switching unit 6. The switch 7C is, for example, an NMOS transistor, the drain is connected to the power supply line 3C, and the source is grounded.

  The switch 7C has a gate connected to the lighting ECU, and is turned on / off according to the duty ratio of the PWM voltage when a PWM voltage is input to the base. When the relay 2 is on and the contact 6A and the contact 6C of the lighting state switching unit 6 are connected, the lamp 5 is lit when the switch 7C is turned on.

  The switch 7D is composed of, for example, an npn type transistor. The collector of the switch 7D is connected to the coil 2B of the relay 2, and the emitter is grounded. The switch 7D has a base connected to the ECU for illumination. When a PWM voltage is input to the base, the switch 7D is turned on / off according to the duty ratio of the PWM voltage. When the switch 7D is turned on, the contact 2A of the relay 2 is connected and the relay 2 is turned on. When the switch 7D is turned off, the contact 2A of the relay 2 is disconnected and the relay 2 is turned off.

  The capacitors 8A and 8B are connected in parallel between the collectors and emitters of the switches 7A and 7B, respectively. The capacitors 8A and 8B are connected to remove the switching noise of the switches 7A and 7B.

  The terminal 9A is provided between the output terminal of the LED 4A, the collector of the switch 7A, and the capacitor 8A. The terminal 9B is provided between the output terminal of the LED 4B, the collector of the switch 7B, and the capacitor 8B. The terminal 9C is provided between the contact 6C of the lighting state switching unit 6 and the drain of the switch 7C. The terminal 9D is provided between the coil 2B of the relay 2 and the collector of the switch 7D.

  Terminals 9A to 9D are terminals of the ECU for illumination. That is, the switches 7A, 7B, 7C, 7D and the capacitors 8A, 8B are part of the circuit of the lighting ECU. However, the switches 7A, 7B, 7C, 7D and the capacitors 8A, 8B may be disposed outside the lighting ECU. In this case, what is necessary is just to connect the control terminal of ECU for illumination to the base of switch 7A, 7B, 7D and the gate of switch 7C. In this case, the terminals 9A to 9D are not necessary.

  In the lighting device 10 of the comparative example as described above, when it is not necessary to turn on the LEDs 4A, 4B and the lamp 5, the lighting ECU turns off the switch 7D and turns off the relay 2, thereby turning on the lighting. The device 10 is disconnected from the vehicle battery.

  The case where it is not necessary to turn on the LEDs 4A and 4B and the lamp 5 is, for example, a state where the vehicle is not used, for example, a state where the vehicle is locked from the outside.

  When it is not necessary to turn on the LEDs 4A, 4B and the lamp 5, the lighting device 10 is disconnected from the battery of the vehicle. For example, even when the LEDs 4A, 4B or the lamp 5 are locked while being turned on, Alternatively, the lamp 5 is turned off to suppress the battery discharge and the battery life reduction.

  By the way, when the relay 2A is turned on from the off state, even if the switches 7A and 7B are off, the capacitors 8A and 8B are charged, so that current is instantaneously supplied to the power supply lines 3A and 3B. Flowing.

  For this reason, even if the switches 7A and 7B are off, when the relay 2A is switched from off to on, the LEDs 4A and 4B may flash. When the LEDs 4A and 4B are flashed even when the switches 7A and 7B are off, there is a possibility that the vehicle user may feel uncomfortable or uncomfortable.

  As described above, in the lighting device 10 according to the comparative example, when the relay 2A is switched from OFF to ON, the LEDs 4A and 4B may be flashed, which may cause the vehicle user to feel uncomfortable or uncomfortable.

  Therefore, in the embodiment described below, an illumination device that solves the above-described problems is provided.

  Embodiments to which the illumination device of the present invention is applied will be described below.

<Embodiment 1>
FIG. 2 is a diagram illustrating a circuit configuration of the lighting apparatus according to the first embodiment.

  The lighting device 100 of Embodiment 1 includes, as main components, a power supply terminal 1, a fuse 1A, a relay 102, power supply lines 3A, 3B, 3C, LEDs 4A, 4B, a lamp 5, a lighting state switching unit 6, and a switch 7A. , 7B, 7C, 7D, capacitors 8A, 8B, and bypass lines 103A, 103B.

  Of the constituent elements of the lighting apparatus 100 of the first embodiment, the same or equivalent constituent elements as those of the lighting apparatus 10 of the comparative example are denoted by the same reference numerals, and description thereof is omitted.

  The relay 102 is a three-terminal relay having terminals 102A, 102B, 102C, a contact 102D, and a coil 2B.

  The terminal 102A is connected to the power supply terminal 1 via the fuse 1A. The terminal 102B is connected to the power supply lines 3A to 3C. The terminal 102C is connected to the bypass lines 103A and 103B. The contact 102D selectively switches the connection destination of the terminal 102A to the terminal 102B or 102C. FIG. 2 shows a state where the contact 102D connects the terminal 102A and the terminal 102C.

  In the relay 102, when no current flows through the coil 2B, the contact 102D connects the terminal 102A and the terminal 102C. On the other hand, when an electric current flows through the coil 2B and electromagnetic force is generated, the contact 102D is switched to connect the terminal 102A and the terminal 102B.

  In a state where the terminals 102A and 102B of the relay 102 are connected, the LEDs 4A and 4B are turned on / off by turning on / off the switches 7A and 7B. When the terminal 102A and the terminal 102B of the relay 102 are connected and the terminal 6A and the terminal 6C of the lighting state switching unit 6 are connected, the lamp 5 is turned on / off by turning on / off the switch 7C. Is done.

  The bypass line 3A connects the terminal 102C of the relay 102 and the point A of the power supply line 3A. The bypass line 3A bypasses the LED 3A between the relay 102 and the point A. That is, the bypass line 3A bypasses the LED 3A between the power supply terminal 1 and the switch 7A.

  The bypass line 3B connects the terminal 102C of the relay 102 and the point B of the power supply line 3B. The bypass line 3B bypasses the LED 3B between the relay 102 and the point B. That is, the bypass line 3B bypasses the LED 3B between the power supply terminal 1 and the switch 7B. The number of bypass lines 3A and 3B is one on the upstream side (the power supply terminal 1 side) from the connection point C.

  Next, the operation of the lighting apparatus 100 according to Embodiment 1 will be described with reference to FIG.

  FIG. 3 is a diagram illustrating an operation of the illumination device 100 according to the first embodiment. FIG. 3 shows whether or not power supply to the LEDs 4A and 4B and the lamp 5 is necessary (necessary / unnecessary), the connection destination (terminal 102B or 102C) of the terminal 102A of the relay 102, and the charging state (charging / charging) (Non-charging).

  As shown in FIG. 3, no power supply is required at time t0, and the terminal 102A of the relay 102 is connected to the terminal 102C. That is, the contact 102D of the relay 102 connects the terminal 102A and the terminal 102C as shown in FIG.

  In this state, the power supply terminal 1 is connected to the bypass lines 103A and 103B via the terminal 102A, the contact 102D, and the terminal 102C of the relay 102. That is, the power supply terminal 1 is connected to the capacitors 8A and 8B via the relay 102 and the bypass lines 103A and 103B.

  For this reason, at time t0, power supply is not required, but the capacitors 8A and 8B are connected to the power supply terminal 1 and are charged. The state where power supply is unnecessary is, for example, a case where the vehicle is locked from the outside. In such a case, the door lock ECU detects that the vehicle is locked, and the door lock ECU notifies the lighting ECU that the vehicle is locked. It is determined that supply is unnecessary.

  Next, the power supply is switched to the main at time t1. The power supply is switched to the main point when, for example, the vehicle is unlocked. For example, in a vehicle equipped with a smart entry system, when a user holding a smart key approaches the vehicle, the door lock ECU unlocks the door lock, and the door lock is unlocked and communicates to the lighting ECU. In this case, the lighting ECU determines that power supply is necessary.

  At time t1, the connection destination of the terminal 102A of the relay 102 is switched from the terminal 102C to the terminal 102B. Thereby, the power supply terminal 1 is connected to the power supply lines 3A to 3C. The relay 102 is switched by the lighting ECU.

  For this reason, LED4A, 4B and the lamp | ramp 5 will be in the state in which on / off control is possible by switch 7A-7C.

  By the way, in the lighting device 100 according to the first embodiment, the capacitors 8A and 8B are charged even when power supply is unnecessary.

  Therefore, even when the power supply is switched from unnecessary to necessary at time t1, the capacitors 8A and 8B are not charged unlike the lighting device 10 of the comparative example (see FIG. 1), and the power supply is switched from unnecessary to necessary. Current does not flow through the power supply lines 3A and 3B.

  For this reason, in the lighting apparatus 100 of Embodiment 1, even if the connection destination of the terminal 102A of the relay 102 is switched from the terminal 102C to the terminal 102B, it is possible to suppress the LEDs 4A and 4B from flashing.

  As described above, according to the first embodiment, it is possible to provide the lighting device 100 that suppresses the blinking of the LEDs 4A and 4B when the relay 102 switches from a state where power supply is not necessary to a necessary state.

  By suppressing the blinking lights of the LEDs 4A and 4B, it is possible to suppress discomfort and discomfort to the vehicle user.

  In the above description, the case where the switches 7A, 7B, and 7D are npn-type transistors and the switch 7C is an N-type MOSFET has been described. However, the switches 7A, 7B, and 7D may be pnp-type transistors. The switch 7C may be a P-type MOSFET.

  Moreover, although the illuminating device 100 demonstrated the form containing two LED4A, 4B above, as long as the number of LED is one or more, what number may be sufficient. Further, the lighting device 100 may not include the lamp 5.

  The switches 7A to 7D may be driven by a driving method other than the PWM driving method.

  In addition, although the form which applied the illuminating device 100 to the vehicle was demonstrated above, the illuminating device 100 is applicable other than a vehicle. It is particularly public in environments where lighting is driven by battery power.

<Embodiment 2>
FIG. 4 is a diagram illustrating a circuit configuration of the lighting apparatus according to the first embodiment.

  The illuminating device 200 of Embodiment 2 includes, as main components, a power supply terminal 1, power supply lines 3A, 3B, 3C, LEDs 4A, 4B, a lamp 5, a lighting state switching unit 6, and switches 7A, 7B, 7C, 7D. , Capacitors 8A and 8B, and MOSFET 201.

  Of the constituent elements of the lighting apparatus 200 of the first embodiment, the same or equivalent constituent elements as those of the lighting apparatus 10 of the comparative example are denoted by the same reference numerals and description thereof is omitted.

  The MOSFET 201 is, for example, a P-type MOSFET. The drain of the MOSFET 201 is connected to the power supply terminal 1, and the source is connected to the power supply lines 3A to 3C. Further, the gate of the MOSFET 201 is connected to the collector of the switch 7D through a resistor for resistance adjustment.

  The MOSFET 201 is driven by switching on / off of the switch 7D under the control of the lighting ECU.

  In the state where the switch 7D is off, the transistor constituting the switch 7D is off, so that the P-type MOSFET 201 is off.

  On the other hand, when the switch 7D is turned on, the MOSFET 201 is turned on because the gate of the MOSFET 201 is grounded via the switch 7D.

  Next, the operation of the lighting apparatus 200 according to the second embodiment will be described with reference to FIG.

  FIG. 5 is a diagram illustrating an operation of the lighting apparatus 200 according to the second embodiment. FIG. 5 shows whether or not power supply to the LEDs 4A, 4B and the lamp 5 is necessary (necessary / unnecessary), the MOSFET 201 is turned on (ON) / off (OFF), and the capacitors 8A, 8B are charged (charged / uncharged). The time transition of is shown.

  At time t0, power supply is unnecessary, and the MOSFET 201 is turned off. When the MOSFET 201 is off, the power supply terminal 1 and the power supply lines 3A to 3C are not connected, so that the capacitors 8A and 8B are not charged (uncharged).

  When power supply is switched to the main at time t1, MOSFET 201 is pulse-driven until time t2. In FIG. 5, the pulse driving is performed three times between the times t1 and t2. In order to drive the MOSFET 201 in a pulsed manner, the switch 7D may be driven in a pulsed manner by applying a voltage to the base of a transistor that constitutes the switch 7D by an illumination ECU.

  In this way, while the MOSFET 201 is pulse-driven, the capacitors 8A and 8B are charged in stages, and charging is completed at time t2.

  The pulse width and the number of pulses when the MOSFET 201 is pulse-driven are such that the capacitors 8A and 8B can be sufficiently charged by pulse-driving the MOSFET 201 between times t1 and t2, and the LEDs 4A and 4B do not blink. The pulse width may be set to For this reason, the pulse width and the number of pulses are not limited to those shown in FIG.

  By setting such a pulse width, even when the switches 7A and 7B are on, the LEDs 4A and 4B are not lit while the MOSFET 201 is pulse-driven between the time t1 and the time t2. Capacitors 8A and 8B can be charged.

  For this reason, according to the lighting apparatus 200 of the second embodiment, the capacitors 8A and 8B are charged by pulse driving the MOSFET 201 during a predetermined time (time t1 to t2) when the power supply is not necessary and is switched to the main. At the same time, the flashing of the LEDs 4A and 4B can be suppressed.

  After the time t2 when the charging of the capacitors 8A and 8B is completed, the LEDs 4A and 4B and the lamp 5 can be turned on by switching the switches 7A, 7B and 7C.

  Moreover, according to the illuminating device 200 of Embodiment 2, it has the structure which replaced the fuse 1A and the relay 2 in the illuminating device 10 of the comparative example with the semiconductor relay (MOSFET201).

  Here, as the fuse 1A, for example, a semiconductor relay formed of a MOSFET can be used. In such a case, since the semiconductor relay (MOSFET) used as the fuse 1A can be used as the MOSFET 201 shown in FIG. 4, the lighting device 200 can be realized without adding components.

  By suppressing the blinking lights of the LEDs 4A and 4B, it is possible to suppress discomfort and discomfort to the vehicle user.

  The embodiment using the P-type MOSFET 201 has been described above. However, if the MOSFET 201 has a circuit configuration capable of connecting the power supply terminal 1 and the power supply lines 3A to 3C when power supply is required, N It may be a type of MOSFET.

  As mentioned above, although the illuminating device of exemplary embodiment of this invention was demonstrated, this invention is not limited to embodiment disclosed specifically, and does not deviate from a claim, Various modifications and changes are possible.

DESCRIPTION OF SYMBOLS 100 Lighting apparatus 1 Power supply terminal 102 Relay 3A, 3B, 3C Power supply line 4A, 4B LED
5 lamp 6 lighting state switching unit 7A, 7B, 7C, 7D switch 8A, 8B capacitor 9A, 9B, 9C, 9D terminal 103A, 103B bypass line 200 lighting device 201 MOSFET

Claims (4)

A power supply line connected to the power terminal;
A light emitting diode inserted into the power supply line;
A switch connected to a power supply line on the downstream side of the light emitting diode, and for switching on and off the light emitting diode;
A capacitor connected in parallel to the switch;
A bypass line that bypasses the light emitting diode between the power supply terminal and the switch;
A switching unit that selectively switches a supply destination of power input to the power supply terminal to the power supply line or the bypass line, and the switching unit switches between the power supply terminal and the bypass line when the light emitting diode is turned off. Connect the lighting device.   The switching unit is a three-terminal relay having a first terminal connected to the power supply terminal, a second terminal connected to the power supply line, and a third terminal connected to the bypass line. Item 2. The lighting device according to Item 1. A power supply line connected to the power terminal;
A light emitting diode inserted into the power supply line;
A switch connected to a power supply line on the downstream side of the light emitting diode, and for switching on and off the light emitting diode;
A capacitor connected in parallel to the switch;
And a transistor inserted into the power supply line between the power supply terminal and the light emitting diode, and the transistor is pulse-driven at the start of light emission of the light emitting diode.   The lighting device according to claim 3, wherein the transistor is a MOS transistor.

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