JP2009224046A - Led module, lighting device, and illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED module, a lighting device and an illumination device wherein one kind of lighting circuit can cope with the LED module having various series connections, and safety, reliability and high versatility can be secured. <P>SOLUTION: The LED module 1 includes: an LED series circuit 11 in which a plurality of LEDs are connected in series; a notification terminal 15c by which a connection/separation of the LED module 1 is notified in response to the connection/separation of a terminal 11c for lighting device connection to and from the lighting device 2. The lighting device 2 includes: a DC/DC conversion circuit 22 which outputs a direct current to the LED module 1; a constant voltage portion 23; a constant current portion 24; a load state detection portion 25 which detects the connection/separation of the LED module 1; and an operation control part 27 by which the DC/DC conversion circuit 22 is put into an operation state when the load state detection portion 25 detects the connection of the LED module 1, and the DC/DC conversion circuit 22 is put into an stop state when the separation is detected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an LED module including an LED series circuit in which a plurality of LEDs are connected in series, a lighting device that lights such an LED module, and a lighting device including such an LED module and the lighting device.

  Since development of LED (Light Emitting Diode: semiconductor light emitting diode) has progressed and technology capable of emitting white light has been developed, it has been proposed to use LED as a light source of an illumination lamp.

  However, since a sufficient amount of light cannot be obtained with a single LED, an illumination device including an LED module on which a plurality of LEDs are mounted has been proposed (for example, see Patent Document 1).

  FIG. 5 is a circuit diagram showing a circuit configuration of a conventional LED module and lighting device.

  A conventional LED module 101 includes an LED series circuit 111 in which a plurality of (for example, five) LEDs are connected in series, and a lighting device connection terminal 111c (for example, a connector) that connects the LED series circuit 111 as a load to the lighting device 102. With. The lighting device connection terminal 111c is connected to the output terminal 122c of the lighting device 102 by insertion.

  A conventional lighting device 102 includes a rectifying circuit 121 that rectifies alternating current, a DC / DC converting circuit 122 that performs DC / DC conversion on the output of the rectifying circuit 121 and outputs direct current to an LED module 101 in which a plurality of LEDs are connected in series. The constant voltage unit 123 that detects the output voltage of the DC / DC conversion circuit 122 and feeds it back to the DC / DC conversion circuit 122 to keep the output voltage constant, and detects the output current of the DC / DC conversion circuit 122 to detect DC. A constant current unit 124 that feeds back the / DC conversion circuit 122 and keeps the output current constant.

  The rectifier circuit 121 supplies the DC / DC conversion circuit 122 with a voltage obtained by rectifying and smoothing the alternating current input via the power supply terminal 121c by the diode bridge D1 and the capacitor C1.

  The DC / DC conversion circuit 122 includes a transformer Tf whose primary side is connected to the rectifier circuit 121, and a switching element Q2 (for example, a field effect transistor) connected in series to the primary side of the transformer Tf. The output of the rectifier circuit 121 is turned on / off by the switching element Q2 (the current flowing through the transformer Tf is turned on / off), and the magnitude of the direct current obtained on the secondary side of the transformer Tf is adjusted.

  That is, the secondary side of the transformer Tf is connected to the diode D2 and the capacitor C4 for rectifying and smoothing the secondary output of the transformer Tf, and is configured to supply direct current to the LED module 101 from the output terminal 122c. .

  The on-time (on / off switching) of the switching element Q2 is controlled by the integrated circuit 122j connected to the rectifier circuit 121. The integrated circuit 122j includes a power supply terminal HV, a drive terminal Drv, a feedback signal terminal FB, a current detection terminal CS, and a reference potential terminal GND.

  The power supply terminal HV inputs the output of the rectifier circuit 121 as a power supply and operates the integrated circuit 122j. The drive terminal Drv outputs a PWM signal to the switching element Q2. The PWM signal is appropriately adjusted by a signal fed back from the constant voltage unit 123 and the constant current unit 124 to the feedback signal terminal FB via the feedback control unit 126. The current detection terminal CS is configured to detect the peak current of the resistor R2 and control the on-time of the switching element Q2.

  The feedback control unit 126 is configured by a so-called photocoupler, the primary side is configured by a light emitting element 126d (for example, an LED), and the secondary side is configured by a light receiving element 126t (for example, a phototransistor), with electrical insulation. The feedback is applied to the integrated circuit 122j.

  The anode of the light emitting element 126d is connected to the positive side of the output terminal 122c via the resistor R3, and the cathode of the light emitting element 126d is connected to the cathode of the Zener diode ZD. The collector of the light receiving element 126t is connected to the feedback signal terminal FB, and the emitter of the light receiving element 126t is connected to the reference potential terminal GND.

  The constant voltage unit 123 is configured by a series circuit of a resistor R3 connected to both ends of the capacitor C4, a light emitting element 126d of the feedback control unit 126, and a Zener diode ZD.

  In a state where the LED module 101 is connected to the lighting device 102, the voltage between the terminals of the output terminal 122c rises, and the rated voltage Vz of the Zener diode ZD (more precisely, the rated voltage Vz, both ends of the resistor R3). When the voltage and the forward voltage of the light emitting element 126d constituting the primary side of the feedback control unit 126 are exceeded, a forward current flows through the light emitting element 126d and the light emitting element 126d emits light. That is, the optical signal from the light emitting element 126d is transmitted to the light receiving element 126t.

  Since the light signal from the light emitting element 126d is detected by the light receiving element 126t and the light receiving element 126t is turned on, the feedback signal terminal FB is pulled down to the potential of the reference potential terminal GND to suppress the on time of the switching element Q2. It is possible to suppress the voltage between the terminals of the output terminal 122c.

  That is, the constant voltage unit 123 is configured to detect the output voltage of the DC / DC conversion circuit 122 and feed back to the DC / DC conversion circuit 122 (integrated circuit 122j) to keep the output voltage constant.

  The constant current unit 124 includes a resistor R3, a light emitting element 126d of the feedback control unit 126, a transistor Q3, a resistor R5, a resistor R6, and a capacitor C5. The resistor R5 is inserted and connected to the negative wiring path of the output terminal 122c.

  When the LED module 101 is connected to the lighting device 102 and the current supplied to the LED module 101 rises and the voltage drop at the resistor R5 exceeds the base voltage of the transistor Q3, the transistor Q3 is turned on and emits light. A forward current flows through the element 126d, and the light emitting element 126d emits light. That is, the optical signal from the light emitting element 126d is transmitted to the light receiving element 126t.

  Since the light signal from the light emitting element 126d is detected by the light receiving element 126t and the light receiving element 126t is turned on, the feedback signal terminal FB is pulled down in the direction of the reference potential terminal GND to suppress the on time of the switching element Q2 and output. It becomes possible to suppress the voltage between the terminals of the use terminal 122c, and to suppress the current supplied to the LED module 101.

  That is, the constant current unit 124 is configured to detect the output current of the DC / DC conversion circuit 122 and feed back to the DC / DC conversion circuit 122 (integrated circuit 122j) to keep the output current constant.

  The resistor R4 flows a bias current for stabilizing the oscillation of the DC / DC converter 122 when the load is released, so the capacitor C4 is connected for primary-secondary coupling for suppressing electromagnetic noise. ing.

  In a state where the LED module 101 is connected to the lighting device 102, the DC / DC conversion circuit 122 is set to operate at a constant current, and the LED module 101 is set to light at a constant current.

  On the other hand, when the LED module 101 is separated from the lighting device 102 for replacement or the like, since no current flows to the LED module 101, no voltage drop occurs at the resistor R5, and the transistor Q3 is turned off. The output voltage of the DC / DC conversion circuit 122 rises and is set to operate at a constant voltage with a voltage based on the Zener diode ZD.

  When the LED module 101 is reconnected to the lighting device 102 with the output voltage increased, the response of the constant current unit 124 is delayed at the moment of connection, and the voltage set by the constant voltage unit 123 becomes the LED module 101 (LED Since it is applied as it is to the series circuit 111), an excessive inrush current flows to the LED as compared with the normal lighting. Normally, the voltage set by the constant voltage unit 123 is set to about 1.1 to 1.2 times that at the time of normal lighting (at the time of constant current operation) so that the LED is not broken even at the time of reconnection described above. is there.

  For example, since five LEDs are connected, assuming that the voltage per LED is 3.5 volts, the voltage supplied to the LED module 101 is 3.5 × 5 = 17.5 (volts). That is, the voltage set in the constant voltage unit 123 of the lighting device 102 is, for example, 17.5 × 1.2 = 21 (volts).

For example, when the LED module 101 having four LEDs in the LED series circuit 111 is connected to the lighting device 102 set in this way, 21 volts is applied to the four LEDs at the time of reconnection. As a result, there is a problem that an excessive current may flow to the LED when it is connected and the LED may be destroyed. Further, when the number is smaller, a larger inrush current is generated.
JP 2006-210271 A

  This invention is made | formed in view of such a condition, Comprising: It is an LED module provided with the LED series circuit which connected several LED in series, Comprising: It responds to connection / separation of the terminal for lighting device connection with respect to a lighting device. When the LED module (lighting device connection terminal) is connected to the lighting device by providing a notification terminal for notifying the lighting device of connection / separation to the lighting device by connecting / disconnecting to the lighting device. An object of the present invention is to provide an LED module capable of preventing the breakage of the LED module by providing the lighting device with a function of preventing the occurrence of the inrush current and ensuring safety and reliability.

  The present invention is a lighting device including a DC / DC conversion circuit that outputs direct current to an LED module in which a plurality of LEDs are connected in series, and a load state detection unit that detects connection / separation of the LED module; Operation control for setting the DC / DC conversion circuit in the operating state when the load state detection unit detects the connection of the LED module, and for stopping the DC / DC conversion circuit when the load state detection unit detects the separation of the LED module By providing the unit, a lighting device capable of preventing inrush current from the DC / DC conversion circuit to the LED module, preventing destruction of the connected LED module, and ensuring safety and reliability. For other purposes.

  In addition, the present invention includes the LED module according to the present invention and the lighting device according to the present invention, so that the LED module as a load is changed and the number of LEDs connected in series is different (small). Even if it does, it becomes possible to prevent generation | occurrence | production of the inrush current from a lighting device, and it aims at providing the illuminating device which prevented destruction of the LED module and ensured safety and reliability.

  The LED module according to the present invention is an LED module comprising an LED series circuit in which a plurality of LEDs are connected in series, and a lighting device connection terminal for connecting the LED series circuit as a load to the lighting device, A notification terminal for notifying the lighting device of connection / separation of the LED module by connecting / disconnecting the lighting device in response to connection / separation of the lighting device connection terminal to / from the device; And a lighting device connection terminal mechanism that mechanically integrates the lighting device connection terminal and the lighting device connection terminal.

  With this configuration, it is possible to connect the notification terminal to the lighting device according to the connection of the lighting device connection terminal to the lighting device, and to notify the lighting device that the LED module is connected to the lighting device. Providing the lighting device with a function to prevent the occurrence of inrush current when the LED module (lighting device connection terminal) is connected to the lighting device, thereby preventing destruction of the LED module and ensuring safety and reliability. Can do.

  Moreover, the lighting device according to the present invention includes a rectifying circuit that rectifies alternating current, a DC / DC converting circuit that outputs a direct current to an LED module in which the output of the rectifying circuit is DC / DC converted and a plurality of LEDs are connected in series, and A lighting device including a constant current unit that detects an output current of the DC / DC conversion circuit and feeds back the DC / DC conversion circuit to keep the output current constant, A load state detection unit for detecting separation, and when the load state detection unit detects connection of the LED module, the DC / DC conversion circuit is set in an operating state, and the load state detection unit detects separation of the LED module An operation control unit for stopping the DC / DC conversion circuit, an output terminal for outputting direct current to the connected LED module, and the load state detection unit. A detection terminal, characterized in that it comprises a said output terminal and the detection terminal output terminal mechanism which is mechanically integrated.

  With this configuration, the connection / separation of the LED module to the detection terminal and the connection / separation of the LED module to the output terminal are synchronized, and when the connection of the LED module is detected, the DC / DC conversion circuit is set to the operating state. When the separation of the LED module is detected, the DC / DC conversion circuit is stopped and the inrush current from the DC / DC conversion circuit to the LED module can be prevented. Safety and reliability can be ensured by preventing destruction of the battery.

  Further, in the lighting device according to the present invention, the operation control unit is a delay driving unit that causes the DC / DC conversion circuit to be in an operation state after a predetermined time has elapsed when the load state detection unit detects the connection of the LED module. It is characterized by providing.

  With this configuration, even when the connection of the detection terminal to the LED module occurs momentarily earlier than the connection of the output terminal to the LED module, the DC / DC conversion circuit can be reliably started up with constant current operation. Inrush current to the LED module can be prevented.

  Moreover, the illuminating device according to the present invention is an illuminating device including an LED module having an LED series circuit in which a plurality of LEDs are connected in series, and a lighting device that outputs a direct current to the LED module. The LED according to the present invention is characterized in that the lighting device is the lighting device according to the present invention.

  With this configuration, even when an LED module as a load is changed and an LED module having a different number of LEDs connected in series is connected, it is possible to prevent the occurrence of an inrush current from the lighting device. It can be set as the illuminating device which prevented destruction and ensured safety and reliability.

  The LED module according to the present invention is an LED module including an LED series circuit in which a plurality of LEDs are connected in series, and a lighting device connection terminal for connecting the LED series circuit as a load to the lighting device. A notification terminal for notifying the lighting device of connection / separation of the LED module by connecting / disconnecting the lighting device in response to connection / separation of the lighting device connection terminal to / from the device; And a lighting device connection terminal mechanism unit that mechanically integrates the lighting device connection terminal, so that the notification terminal is connected to the lighting device according to the connection of the lighting device connection terminal to the lighting device, and the LED Since it is possible to notify the lighting device that the module is connected to the lighting device, the LED module (lighting device connection terminal) is connected to the lighting device. An effect that can be secured to prevent breakage of the LED module safety and reliability by giving the lighting device a function of preventing the occurrence of the inrush current when connection was.

  Further, according to the lighting device of the present invention, a rectifier circuit that rectifies alternating current, and a DC / DC converter circuit that outputs direct current to an LED module in which the output of the rectifier circuit is DC / DC converted and a plurality of LEDs are connected in series. And a constant current unit that detects the output current of the DC / DC conversion circuit and feeds back to the DC / DC conversion circuit to keep the output current constant. The load state detection unit to detect, and when the load state detection unit detects the connection of the LED module, the DC / DC conversion circuit is set to the operating state, and when the load state detection unit detects the separation of the LED module, the DC / DC conversion is performed. An operation control unit for stopping the circuit, an output terminal for outputting a direct current to the connected LED module, a detection terminal constituting the load state detection unit, and the output terminal And the output terminal mechanism unit that mechanically integrates the detection terminals, so that the connection / separation of the LED module to the detection terminal and the connection / separation of the LED module to the output terminal are synchronized. When the connection of the LED module is detected, the DC / DC conversion circuit is set to the operating state, and when the separation of the LED module is detected, the DC / DC conversion circuit is set to the stop state, and the DC / DC conversion circuit is connected to the LED module. Since occurrence of inrush current can be prevented, the connected LED module can be prevented from being destroyed, and the safety and reliability can be ensured.

  Moreover, according to the illuminating device which concerns on this invention, it is an illuminating device provided with the LED module which has an LED series circuit which connected several LED in series, and the lighting device which outputs direct current to an LED module, Comprising: Since the LED according to the present invention and the lighting device is the lighting device according to the present invention, even when the LED module as a load is changed and the LED modules having different numbers of LEDs connected in series are connected, It is possible to prevent the occurrence of inrush current from the lighting device, and it is possible to cope with various series numbers of LED modules with one type of lighting device, and to make the lighting device highly versatile while ensuring safety and reliability. There is an effect that can be.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
Based on FIG. 1, the LED module and the lighting device according to Embodiment 1 will be described.

  1 is a circuit diagram showing a circuit configuration of an LED module and a lighting device according to Embodiment 1 of the present invention.

  The LED module 1 according to the present embodiment includes an LED series circuit 11 in which a plurality of (for example, five) LEDs are connected in series, and a lighting device connection terminal 11c that connects the LED series circuit 11 as a load to the lighting device 2. (For example, a connector). The lighting device connection terminal 11c is connected to the output terminal 22c of the lighting device 2 by insertion.

  Further, the LED module 1 is connected / disconnected to the lighting device 2 by connecting / disconnecting the lighting device 2 in response to the connection / disconnection of the lighting device connection terminal 11 c to / from the lighting device 2. Is provided with a notification terminal 15c (for example, a connector). The notification terminal 15c is connected to the detection terminal 25c of the lighting device 2 by insertion.

  That is, the LED module 1 includes a notification unit 15 that notifies connection / separation of the LED module 1. The notification unit 15 includes, for example, a pair of notification terminals 15c and a terminal connection unit 15w that connects the notification terminals 15c to each other. The notification status will be described later together with the description of the lighting device 2.

  With this configuration, the notification terminal 15c is connected to the lighting device 2 according to the connection of the lighting device connection terminal 11c to the lighting device 2, and the lighting device 2 is notified that the LED module 1 is connected to the lighting device 2. Therefore, it is possible to destroy the LED module 1 by providing the lighting device 2 with a function of suppressing the inrush current when the LED module 1 (lighting device connection terminal 11c) is connected to the lighting device 2. It can prevent and secure safety and reliability.

  The LED module 1 includes a lighting device connection terminal mechanism 17 in which the notification terminal 15c and the lighting device connection terminal 11c are mechanically integrated. The lighting device connection terminal mechanism 17 is fitted into the output terminal mechanism 28 of the lighting device 2, and the lighting device connection terminal 11c is used as the output terminal 22c, and the notification terminal 15c is used as the detection terminal 25c. It is possible to connect to.

  Therefore, by providing the lighting device connection terminal mechanism 17, it is possible to synchronize the connection / separation of the notification terminal 15 c to the lighting device 2 and the connection / separation of the lighting device connection terminal 11 c to the lighting device 2. The notification terminal 15c can be made to function with high accuracy.

  The lighting device 2 according to the present embodiment includes a rectifier circuit 21 that rectifies alternating current, and DC / DC that outputs the direct current to the LED module 1 in which the output of the rectifier circuit 21 is DC / DC converted and a plurality of LEDs are connected in series. A conversion circuit 22, a constant voltage unit 23 that detects the output voltage of the DC / DC conversion circuit 22 and feeds back to the DC / DC conversion circuit 22 to keep the output voltage constant, and an output current of the DC / DC conversion circuit 22 And a constant current unit 24 that feeds back to the DC / DC conversion circuit 22 and keeps the output current constant.

  The lighting device 2 according to the present embodiment includes a load state detection unit 25 that detects connection / separation of the LED module 1 and DC / DC conversion when the load state detection unit 25 detects connection of the LED module 1. An operation control unit 27 is provided that puts the circuit 22 into an operating state and puts the DC / DC conversion circuit 22 into a stopped state when the load state detecting unit 25 detects the separation of the LED module 1.

  Therefore, when the connection of the LED module 1 is detected, the DC / DC conversion circuit 22 is set in the operating state, and when the separation of the LED module 1 is detected, the DC / DC conversion circuit 22 is set in the stop state. Since it is possible to prevent the inrush current from the conversion circuit 22 to the LED module 1, it is possible to prevent the connected LED module 1 from being broken and to ensure safety and reliability.

  Further, the lighting device 2 according to the present embodiment includes an output terminal 22c (for example, a connector) that outputs a direct current to the connected LED module 1 and a detection terminal 25c (for example, a connector) that constitutes the load state detection unit 25. And an output terminal mechanism unit 28 that mechanically integrates the output terminal 22c and the detection terminal 25c. As described above, the output terminal mechanism 28 is fitted into the lighting device connection terminal mechanism 17 so that the output terminal 22c is the lighting device connection terminal 11c and the detection terminal 25c is the notification terminal. 15c can be connected to 15c.

  Therefore, by providing the output terminal mechanism 28, it is possible to synchronize the connection / separation of the LED module 1 to / from the detection terminal 25c and the connection / separation of the LED module 1 to the output terminal 22c. The terminal 25c can be made to function with high accuracy.

  The rectification circuit 21 supplies the DC / DC conversion circuit 22 with a voltage obtained by rectifying and smoothing the alternating current input via the power supply terminal 21c by the diode bridge D1 and the capacitor C1.

  The DC / DC conversion circuit 22 includes a transformer Tf whose primary side is connected to the rectifier circuit 21, and a switching element Q2 (for example, a field effect transistor) connected in series to the primary side of the transformer Tf. The output of the rectifier circuit 21 is turned on / off by the switching element Q2 (the current flowing through the transformer Tf is turned on / off), and the magnitude of the direct current obtained on the secondary side of the transformer Tf is adjusted.

  That is, the secondary side of the transformer Tf is connected to the diode D2 and the capacitor C4 for rectifying and smoothing the secondary output of the transformer Tf, and is configured to supply direct current to the LED module 1 from the output terminal 22c. .

  The on-time (on / off switching) of the switching element Q2 is controlled by the integrated circuit 22j connected to the rectifier circuit 21. The integrated circuit 22j includes a power supply terminal HV, a drive terminal Drv, a feedback signal terminal FB, a current detection terminal CS, and a reference potential terminal GND.

  The power supply terminal HV inputs the output of the rectifier circuit 21 as a power supply and operates the integrated circuit 22j. The drive terminal Drv outputs a PWM signal to the switching element Q2. The PWM signal is appropriately adjusted by a signal fed back from the constant voltage unit 23 and the constant current unit 24 to the feedback signal terminal FB via the feedback control unit 26. The current detection terminal CS functions together with the resistor R2 to adjust the bias of the switching element Q2.

  The feedback control unit 26 is configured by a so-called photocoupler, the primary side is configured by a light emitting element 26d (for example, an LED), and the secondary side is configured by a light receiving element 26t (for example, a phototransistor), with electrical insulation. Thus, feedback is applied to the integrated circuit 22j.

  The anode of the light emitting element 26d is connected to the plus side of the output terminal 22c via the resistor R3, and the cathode of the light emitting element 26d is connected to the cathode of the Zener diode ZD. The collector of the light receiving element 26t is connected to the feedback signal terminal FB, and the emitter of the light receiving element 26t is connected to the reference potential terminal GND.

  The constant current unit 24 includes a resistor R3, a light emitting element 26d of the feedback control unit 26, a transistor Q3, a resistor R5, a resistor R6, and a capacitor C5. The resistor R5 is inserted and connected to the negative wiring path of the output terminal 22c.

  When the LED module 1 is connected to the lighting device 2 and the current supplied to the LED module 1 rises and the voltage drop at the resistor R5 exceeds the base voltage of the transistor Q3, the transistor Q3 is turned on and emits light. A forward current flows through the element 26d, and the light emitting element 26d emits light. That is, the optical signal from the light emitting element 26d is transmitted to the light receiving element 26t.

  The optical signal from the light emitting element 26d is detected by the light receiving element 26t, and the light receiving element 26t is turned on. Therefore, the feedback signal terminal FB is pulled down in the direction of the reference potential terminal GND, and the on time of the switching element Q2 is suppressed and output. It is possible to suppress the voltage between the terminals of the use terminal 22c and suppress the current supplied to the LED module 1.

  That is, the constant current unit 24 is configured to detect the output current of the DC / DC conversion circuit 22 and feed back to the DC / DC conversion circuit 22 (integrated circuit 22j) to keep the output current constant.

  As in the prior art, the resistor R4 flows a bias current for stabilizing the oscillation of the DC / DC converter 22 when the load is released, so the capacitor C4 has a primary-secondary coupling for suppressing electromagnetic noise. Connected for use.

  Moreover, although the constant voltage part 23 is not necessarily required, it is more preferable to put it. The constant voltage unit 23 is configured by a series circuit of a resistor R3 connected to both ends of the capacitor C4, a light emitting element 26d of the feedback control unit 26, and a Zener diode ZD, as in the prior art.

  Operations of the load state detection unit 25 and the operation control unit 27 will be described. As described above, the load state detection unit 25 includes a pair of detection terminals 25c. The operation control unit 27 includes a resistor R1 and a transistor Q1 connected to both ends of the output of the rectifier circuit 21.

  In the operation control unit 27, the resistor R1 is connected to one (plus side) of the output of the rectifier circuit 21, the emitter of the transistor Q1 is connected to the other (minus side), and the other end of the resistor R1 is connected to the base of the transistor Q1. . The base of the transistor Q1 is connected to one terminal of the detection terminal 25c, and the other terminal of the detection terminal 25c is connected to the reference potential terminal GND. The collector of the transistor Q1 is connected to the feedback signal terminal FB.

  Therefore, in a state where the LED module 1 is connected to the lighting device 2, the pair of detection terminals 25c are connected to each other (short circuit state, that is, a state where the connection of the lighting device 2 is detected), and the transistor. Since the base of Q1 is always the potential of the reference potential terminal GND, the transistor Q1 is turned off. When the transistor Q1 is in an off state, the feedback signal terminal FB is separated from the transistor Q1.

  That is, in a state where the LED module 1 is connected to the lighting device 2, the integrated circuit 22 j operates normally and supplies a constant current to the LED module 1 with the DC / DC conversion circuit 22 in an operating state.

  On the other hand, in a state where the LED module 1 is separated from the lighting device 2, the pair of detection terminals 25c are separated from each other (separated state, that is, a state where separation of the lighting device 2 is detected), and a transistor. Since the base of Q1 is biased by the resistor R1 and the base current is supplied, the transistor Q1 is turned on.

  That is, the integrated circuit 22j is brought into a state where the feedback signal terminal FB is pulled down to the level of the reference potential terminal GND, and the stopped state is maintained. Therefore, in a state where the LED module 1 is separated from the lighting device 2, the DC / DC conversion circuit 22 is stopped and the supply of direct current to the LED module 1 is stopped.

  According to the lighting device 2 according to the present embodiment, when the LED module 1 is separated, the voltage increase in the DC / DC conversion circuit 22 that has occurred in the conventional lighting device does not occur. Therefore, it is possible to reliably prevent the occurrence of an inrush current that has occurred due to reconnection.

  As described above, the lighting device 2 according to the present embodiment includes the load state detection unit 25 that detects the connection / separation of the LED module 1 and the DC / DC when the load state detection unit 25 detects the connection of the LED module 1. Since the DC conversion circuit 22 is in an operation state, and the load state detection unit 25 detects the separation of the LED module 1, an operation control unit 27 that stops the DC / DC conversion circuit 22 is provided. It is possible to reliably prevent the occurrence of inrush current due to reconnection.

<Embodiment 2>
Based on FIG. 2, the LED module and the lighting device according to Embodiment 2 will be described.

  FIG. 2 is a circuit diagram showing a circuit configuration of the LED module and the lighting device according to Embodiment 2 of the present invention.

  Since the LED module 1 according to the present embodiment is the same as the LED module 1 according to the first embodiment, description thereof is omitted. Moreover, since the lighting device 2 according to the present embodiment is basically the same as the lighting device 2 according to the first embodiment, different items will be mainly described.

  In the lighting device 2 according to the present embodiment, the load state detection unit 25 is different from the load state detection unit 25 of the first embodiment in that the load state detection unit 25 includes a detection terminal separation circuit unit 25s. Further, since the detection terminal separation circuit unit 25s is provided, the connection state of the detection terminal 25c is also different from that of the first embodiment.

  The detection terminal separation circuit unit 25s is constituted by a so-called photocoupler, the primary side is constituted by a light emitting element 25sd (for example, an LED), and the secondary side is constituted by a light receiving element 25st (for example, a phototransistor), with electrical insulation. The operation control unit 27 is controlled in the state.

  One terminal of the detection terminal 25c is connected to the positive side of the output terminal 22c via the resistor 7, and one terminal of the detection terminal 25c is connected to the anode of the light emitting element 25sd, and the cathode of the light emitting element 25sd. Is connected to the anode of a Zener diode ZD. The collector of the light receiving element 25st is connected to the base of the transistor Q1, and the emitter of the light receiving element 25st is connected to the reference potential terminal GND.

  When the LED module 1 is separated, no current flows through the light emitting element 25sd. Accordingly, the light receiving element 25st is also turned off, and the base of the transistor Q1 is biased by the resistor R1 and the base current is supplied, so that the transistor Q1 is turned on.

  That is, the integrated circuit 22j is brought into a stopped state in which the feedback signal terminal FB is pulled down to the reference potential terminal GND level. Therefore, in a state where the LED module 1 is separated from the lighting device 2, the DC / DC conversion circuit 22 is stopped and the supply of direct current to the LED module 1 is stopped.

  Further, in a state where the LED module 1 is connected to the lighting device 2, the pair of detection terminals 25 c are connected to each other (a short circuit state, that is, a state where the connection of the lighting device 2 is detected) and the resistance. 7 and the light emitting element 25sd constitute a series circuit, and a forward current flows through the light emitting element 25sd, and the light emitting element 25sd emits light. That is, the optical signal from the light emitting element 26d is transmitted to the light receiving element 25st.

  The optical signal from the light emitting element 25sd is detected by the light receiving element 25st, and the light receiving element 25st is turned on, so that the base of the transistor Q1 is always at the potential of the reference potential terminal GND. That is, the transistor Q1 is turned off. When the transistor Q1 is in an off state, the feedback signal terminal FB is separated from the transistor Q1.

  Therefore, in a state where the LED module 1 is connected to the lighting device 2, the integrated circuit 22 j operates normally and supplies a constant current to the LED module 1 with the DC / DC conversion circuit 22 in an operating state.

  In the state where the LED module 1 is separated, the operation of the lighting device 2 is stopped. Therefore, even if the LED module 1 is connected to the lighting device 2 (output terminal 22c) again, the LED module 1 Does not light up. In this case, the lighting device 2 can be turned on again by disconnecting the connection to the alternating current at the power supply terminal 21c and connecting the lighting device 2 to the alternating current again.

  In addition, this Embodiment aims at implement | achieving the state which insulated the LED module 1 from the primary side of the transformer Tf.

<Embodiment 3>
Based on FIG. 3, the LED module and the lighting device according to Embodiment 3 will be described.

  FIG. 3 is a circuit diagram showing a circuit configuration of the LED module and the lighting device according to Embodiment 3 of the present invention.

  Since the LED module 1 according to the present embodiment is the same as the LED module 1 according to the first embodiment, description thereof is omitted. Moreover, since the lighting device 2 according to the present embodiment is basically the same as the lighting device 2 according to the first embodiment, different items will be mainly described.

  In the lighting device 2 according to the present embodiment, when the load state detection unit 25 detects the connection of the LED module 1, the operation control unit 27 delays driving the DC / DC conversion circuit 22 in the operation state after a certain time has elapsed. The unit 29 is provided.

  Therefore, even when the connection of the detection terminal 25c to the LED module 1 occurs for a moment earlier than the connection of the output terminal 22c to the LED module 1, the DC / DC conversion circuit 22 is reliably started up with a constant current operation. And inrush current to the LED module 1 can be reliably prevented.

  The delay driver 29 can be realized by inserting an appropriate delay circuit (for example, a CR circuit) between the base of the transistor Q1 and the resistor R1.

<Embodiment 4>
Based on FIG. 4, the LED module and the lighting device according to Embodiment 4 will be described.

  FIG. 4 is a circuit diagram showing a circuit configuration of the LED module and the lighting device according to Embodiment 4 of the present invention.

  Since the LED module 1 according to the present embodiment is the same as the LED module 1 according to the first embodiment, description thereof is omitted. Moreover, since the lighting device 2 according to the present embodiment is basically the same as the lighting device 2 according to the second embodiment, different items will be mainly described.

  The lighting device 2 according to the present embodiment is obtained by applying the delay driving unit 29 employed in the lighting device 2 according to the third embodiment to the lighting device 2 according to the second embodiment. In other words, in the present embodiment, the delay time of the delay drive unit 29 is set longer than the time from when the power is supplied to the power supply terminal 21c until the DC / DC conversion operation of the DC / DC conversion circuit 22 starts. It is.

  Therefore, in the second embodiment, when the power is turned on, the operation control unit 27 may operate earlier than the DC / DC conversion operation of the DC / DC conversion circuit 22 and the DC / DC conversion operation may not be started. In the embodiment, the LED module 1 is securely connected when the power is turned on by setting it longer than the time from when the power is supplied to the power supply terminal 21c until the DC / DC conversion operation of the DC / DC conversion circuit 22 is started. Can be lit.

<Embodiment 5>
A lighting device (not shown) according to the fifth embodiment includes the LED module 1 and the lighting device 2 described in the first to fourth embodiments. Therefore, description will be made by applying the reference numerals used in the first to fourth embodiments as they are.

  That is, the lighting device according to the present embodiment is a lighting device including an LED module 1 having an LED series circuit 11 in which a plurality of LEDs are connected in series, and a lighting device 2 that outputs a direct current to the LED module 1. The LED module 1 is the LED described in any one of the first to fourth embodiments, and the lighting device 2 is the lighting described in any one of the first to fourth embodiments. Device 2.

  With this configuration, even when the LED module 1 as a load is changed and the LED modules 1 having different numbers of LEDs connected in series are connected, it is possible to prevent the occurrence of an inrush current from the lighting device 2. The LED module 1 can be prevented from being destroyed, and one type of lighting device 2 can cope with various numbers of LED modules 1 in series, and a highly versatile lighting device can be obtained while ensuring safety and reliability.

It is a circuit diagram which shows the circuit structure of the LED module and lighting device which concern on Embodiment 1 of this invention. It is a circuit diagram which shows the circuit structure of the LED module which concerns on Embodiment 2 of this invention, and a lighting device. It is a circuit diagram which shows the circuit structure of the LED module which concerns on Embodiment 3 of this invention, and a lighting device. It is a circuit diagram which shows the circuit structure of the LED module which concerns on Embodiment 4 of this invention, and a lighting device. It is a circuit diagram which shows the circuit structure of the conventional LED module and a lighting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 LED module 2 Lighting device 11 LED series circuit 11c Lighting device connection terminal 15 Notification part 15c Notification terminal 15w Terminal connection part 17 Lighting device connection terminal mechanism part 21 Rectifier circuit 21c Power supply terminal 22 DC / DC conversion circuit 22c For output Terminal 22j Integrated circuit 23 Constant voltage section 24 Constant current section 25 Load state detection section 25c Detection terminal 25s Detection terminal separation circuit section 25sd Light emitting element 25st Light receiving element 26 Feedback control section 26d Light emitting element 26t Light receiving element 27 Operation control section 28 Output Terminal mechanism part 29 Delay drive part Q2 Switching element

Claims (4)

An LED module comprising an LED series circuit in which a plurality of LEDs are connected in series, and a lighting device connection terminal for connecting the LED series circuit as a load to a lighting device,
A notification terminal for notifying the lighting device of connection / separation of the LED module by connecting / separating to the lighting device in response to connection / separation of the lighting device connection terminal with respect to the lighting device;
An LED module comprising: a lighting device connection terminal mechanism that mechanically integrates the notification terminal and the lighting device connection terminal. A rectifying circuit that rectifies alternating current, a DC / DC converting circuit that outputs a direct current to an LED module in which a plurality of LEDs are connected in series by DC / DC conversion, and an output current of the DC / DC converting circuit And a constant current unit that keeps the output current constant by feeding back to the DC / DC conversion circuit,
A load state detection unit for detecting connection / separation of the LED module;
When the load state detection unit detects the connection of the LED module, the DC / DC conversion circuit is put into an operating state, and when the load state detection unit detects the separation of the LED module, the DC / DC conversion circuit is turned on. An operation control unit to be stopped;
An output terminal for outputting a direct current to the connected LED module;
A detection terminal constituting the load state detection unit;
A lighting device comprising: an output terminal mechanism unit that mechanically integrates the output terminal and the detection terminal. The lighting device according to claim 2,
The operation control unit includes a delay drive unit that puts the DC / DC conversion circuit into an operation state after a predetermined time has elapsed when the load state detection unit detects the connection of the LED module. An illumination device comprising: an LED module having an LED series circuit in which a plurality of LEDs are connected in series; and a lighting device that outputs direct current to the LED module,
The LED module is the LED module according to claim 1,
The lighting device according to claim 2 or 3, wherein the lighting device is the lighting device according to claim 2.

Images