JP2016167396A - Led power supply device and led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To implement cost reduction and simplification of wiring for lighting control in an LED power supply device for lighting control output of two systems.SOLUTION: An LED power device (100) includes a first DC power supply circuit (200A) for generating DC first output current from an AC power supply (AC) and supplying the first output current to a first LED (70A), a first drive control circuit (500A) for making the first DC power supply circuit output first output current based on a current target value, a second DC power supply circuit (200B) for generating DC second output current from the AC power source and supplying the second output current to a second LED (70B), a second drive control circuit (500B) for making the second DC power supply circuit output second output current based on a current target value, a lighting control circuit (600) for determining a current target value based on an input lighting-control signal and outputting the current target value to the first and second drive control circuits, and operation holding means for holding the second or first current target value to a predetermined value when the first or second DC power supply circuit stops.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an LED power supply device and an LED lighting device using the LED power supply device.

  Patent Document 1 discloses a tunnel illumination device. In this lighting device, a plurality of lighting fixtures are connected to a power cable wired along the tunnel at a predetermined interval, and each lighting fixture is connected to a plurality of power supply circuits branched from the power cable and a plurality of power supply circuits. LED light sources connected to each other are provided.

  Patent Document 2 discloses a power supply device that lights an LED. The power supply device has a constant current power supply unit that outputs a constant current to the LED to light the LED, and a correspondence relationship between the configuration of the LED, the dimming degree of the LED, and the current value of the constant current output from the constant current power supply unit in advance. A storage unit for storing and a dimmer for instructing the dimming degree, a current value corresponding to the combination of the configuration of the LED and the dimming degree is read from the storage unit, and a constant current of the read current value is a constant current power supply unit And a control unit for outputting to the control unit.

JP 2011-142026 A JP 2012-175887 A

  By the way, in the LED lighting apparatus for road lights, the structure of a 2 system | strain output is requested | required so that it may not be in a light extinction state at the time of failure of the LED power supply device contained in an LED lighting apparatus. Specifically, in one LED lighting device, two LED power supply devices branched from an AC power supply line and two LED modules connected to the respective LED power supply devices are mounted. As a result, even when the LED power supply device or LED module of one system is turned off due to failure or the like, the lighting state by the LED power supply device and LED module of the other system is obtained, and the LED lighting device as a whole is turned off. Is avoided. In recent years, dimming lighting has been introduced for road lights as well as general lighting from the viewpoint of energy saving and the like. Therefore, if the configuration for dimming disclosed in Patent Document 2 is applied to each of a plurality of power supply circuits and LED light sources connected in parallel as disclosed in Patent Document 1, one LED is provided. Two-system dimming output in the lighting device should be possible.

  As a configuration example of the two-system dimming output as described above, FIG. 6 shows a block diagram of the LED power supply device 105 and the LED illumination device 155 according to the reference example. As shown in FIG. 6, the LED lighting device 155 is connected to the LED power supply device 105 and the power supply devices 105 </ b> A and 105 </ b> B each including two sets of power supply devices 105 </ b> A and 105 </ b> B branched from the AC power supply AC (AC lines L <b> 1 and L <b> 2). It includes LED modules 700A and 700B connected. When a failure occurs in a part of the power supply, the current stage current fuse is often blown. Therefore, as shown in FIG. 6, it is necessary to isolate the system in the previous stage of the current fuse, that is, in the AC lines L1 and L2. The power supply devices 105A and 105B include DC power supply circuits 200A and 200B, detection circuits 300A and 300B, auxiliary power supply circuits 400A and 400B, drive control circuits 500A and 500B, and dimming control circuits 605A and 605B, respectively. Details will be apparent from the description of the embodiment described later). The dimming control circuits 605A and 605B include voltage regulator circuits 610A and 610B, current control circuits 625A and 625B including a microcomputer, and dimming input circuits 630A and 630B, respectively. The dimming signal from the dimming signal generation source D is input to the dimming input circuit 630A through the terminals T7A and T8A, and the wiring is branched at the terminals T7A and T8A, and the dimming input through the terminals T7B and T8B. Input to the circuit 630B. However, according to such a configuration, the high cost of the LED power supply device 105 and the LED lighting device 155 and the complexity of the dimming wiring are problematic.

  Accordingly, the present invention provides a two-system dimming output LED power supply device that can be turned off by the operation of the other output system even when one output system is stopped, and an LED lighting device that uses the LED power supply device. It is an object to realize simplification of the light control wiring.

  The LED power supply device of the present invention includes a first DC power supply circuit that generates a first DC output current from an AC power supply and supplies the first output current to the first LED, and a first current target value. A first drive control circuit that outputs a first output current to the first DC power supply circuit based on the first DC current output circuit, generates a second output current of DC from the AC power supply, and outputs the second output current to the second LED. A second DC power supply circuit to be supplied; a second drive control circuit for causing the second DC power supply circuit to output a second output current based on the second current target value; and a dimming signal input thereto. A dimming control circuit that determines the first and second current target values and outputs the first and second current target values to the first and second drive control circuits, respectively, and a first DC power supply circuit. If it stops, the second target current value is held at a predetermined value, and the second DC power supply circuit stops. To and an operating holding means for holding the first current target value to a predetermined value.

  According to the LED power supply device, the dimming control circuit that outputs the first and second current target values based on the dimming signal to the first and second drive control circuits, respectively, and the first or second DC power supply circuit The operation holding means for holding the second or first current target value at a predetermined value when the operation stops. In other words, a configuration in which one dimming control circuit is shared between the two system outputs can be realized while ensuring the function of preventing the other system from being turned off by stopping one system. In this way, in the LED power supply device for two-line dimming output, it is possible to reduce the cost and simplify the dimming wiring.

  Here, the operation holding means dimmes the first control voltage generated based on the operation of the first DC power supply circuit and the second control voltage generated based on the operation of the second DC power supply circuit. A circuit for supplying to the control circuit is provided, and the dimming control circuit is configured to be operable by supplying one of the first and second control voltages. Thereby, even when the first or second DC power supply circuit is stopped, the control voltage of the dimming control circuit is secured, and the second or first current target value is output. Even if the LED is turned off, the dimming control of the LED of the other system is reliably executed.

  The dimming control circuit includes control voltage detection means for detecting a supply state of the first and second control voltages, and the first control voltage is detected when it is detected that the first control voltage is substantially not supplied. The second current target value is increased, or the second current target value is determined to be a value corresponding to the total light output, and it is detected that the second control voltage is substantially not supplied. The current target value may be increased, or the first current target value may be determined to be a value corresponding to the total light output. Thereby, even when the LED of one of the two systems is turned off, the LED of the other system is brightened or is in an all-light state. It is reduced.

  In addition, the operation holding means operates to supply a first control voltage generated based on the operation of the first DC power supply circuit to the dimming control circuit, and to operate the first DC power supply circuit and the dimming control circuit. And a circuit that outputs a fixed voltage value generated from the second control voltage generated based on the operation of the second DC power supply circuit as the second current target value when the operation is stopped. Good. Accordingly, a configuration in which the control voltage of the dimming control circuit is generated only based on the operation of the first DC power supply circuit is possible, and the wiring around the dimming control circuit is simplified.

  Furthermore, the fixed voltage value may be set to a value equal to or greater than the current target value corresponding to the all-optical output. As a result, even when the first LED of one system is turned off, the second LED of the other system is in the all-light state or the brightened state, so the degree of dimming as a whole of the two systems of LEDs is increased. It is reduced.

  A first current detection circuit that detects a first output current and outputs a first current detection value; and a second current that detects a second output current and outputs a second current detection value. And a detection circuit, wherein the first drive control circuit is configured to perform constant current control on the first output current so that the first current detection value and the first current target value coincide with each other. The second drive control circuit is configured to perform constant current control on the second output current so that the second current detection value matches the second current target value. Thus, the configuration of the LED power supply device of the present invention is also suitably applied to the configuration in which the first and second drive control circuits feedback control the first and second output currents, respectively.

  In addition, a first power supply device including a first DC power supply circuit, a first drive control circuit, and a dimming control circuit is mounted on the first substrate, and the second DC power supply circuit and the second drive control circuit are mounted on the first substrate. A second power supply device including the power supply device is mounted on the second substrate. With this configuration, the first power supply device and the second power supply device sharing one dimming control circuit are connected by a simple wiring.

  The LED lighting device of the present invention includes any one of the LED power supply devices described above, a first LED module having a first LED, and a second LED module having a second LED. Thereby, the LED lighting apparatus which enjoys each of the above effects is realized.

It is a figure which shows the LED power supply device and LED lighting apparatus by the 1st Embodiment of this invention. It is a figure which shows the drive control circuit and the light control circuit in the LED power supply device of 1st Embodiment. It is a figure which shows the drive control circuit and dimming control circuit in the LED power supply device of the 2nd Embodiment of this invention. It is a figure which shows the drive control circuit and the light control circuit in the LED power supply device of the 3rd Embodiment of this invention. It is a figure which shows the LED power supply device and LED lighting apparatus by the modification of this invention. It is a figure which shows the LED power supply device and LED lighting apparatus by a reference example.

<First Embodiment>
FIG. 1 shows a circuit configuration of an LED power supply device 100 according to a first embodiment of the present invention and an LED lighting device 150 using the same. LED lighting device 150 includes LED power supply device 100 including power supply devices 100A and 100B, and LED modules 700A and 700B connected to power supply devices 100A and 100B, respectively. The power supply device 100A and the power supply device 100B are mounted on separate substrates, and are accommodated in, for example, one housing. Throughout this specification, substantially the same components are denoted by the same reference numerals, and “A” or “B” is appended to the end of the reference numerals of the components corresponding to each other. A duplicate description is omitted.

  The AC lines L1 and L2 from the AC power supply AC are connected to the input terminals T1A and T2A of the power supply device 100A, and are branched at the input terminals T1A and T2A and connected to the input terminals T1B and T2B of the power supply device 100B. . Output terminals T3A and T4A of power supply device 100A are connected to terminals T5A and T6A of LED module 700A via wirings W1A and W2A, respectively. Similarly, the output terminals T3B and T4B of the power supply device 100B are connected to the terminals T5B and T6B of the LED module 700B via the wirings W1B and W2B, respectively.

  The dimming signal generation source D is connected to the power supply apparatus 100A via terminals T7 and T8. In the present embodiment, the dimming signal generated by the dimming signal generation source D is, for example, an AC 200 V signal, and indicates the dimming degree depending on the presence or absence of the signal. Specifically, for example, lighting of all lights is instructed when the dimming signal (AC200V voltage) is off, and lighting of dimming is instructed when the dimming signal is on. However, the format of the dimming signal is not limited to the above. For example, the dimming signal may be a PWM signal. In this case, the on-duty of the PWM signal is set according to the dimming rate.

  The LED module 700A includes an LED 71A composed of a plurality of LED elements connected in series between the terminal T6A and the terminal T7A. In addition, in the figure, although the LED array of the single row connected in series in each LED module is shown, in each LED module, the LED array of several rows may be connected in parallel. The configuration of the LED module 700B is the same as the configuration of the LED module 700A. Further, the LED modules 700A and 700B may be integrated in the same casing as the LED power supply apparatus 100, or may be configured as separate bodies in separate casings. Further, the LED modules 700A and 700B may be integrated, or may be configured as separate bodies.

  The power supply apparatus 100A includes a DC power supply circuit 200A, a detection circuit 300A, an auxiliary power supply circuit 400A, a drive control circuit 500A, and a dimming control circuit 600. On the other hand, the power supply device 100B includes a DC power supply circuit 200B, a detection circuit 300B, an auxiliary power supply circuit 400B, and a drive control circuit 500B. In other words, the dimming control circuit 600 is included in the power supply apparatus 100A and is not included in the power supply apparatus 100B. For example, there are provided two substrates on which a DC power supply circuit, a detection circuit, an auxiliary power supply circuit, a drive control circuit, and a dimming control circuit can be mounted (that is, with such a pattern wiring). The entire circuit including the control circuit 600 may be mounted, and the circuit other than the dimming control circuit may be mounted on the other substrate. Thereby, standardization of the substrate becomes possible. The terminals T9A, T10A, and T11A of the power supply device 100A and the terminals T9B, T10B, and T11B of the power supply device 100B are connected to each other via wirings W3, W4, and W5, respectively. In this way, the power supply device 100A and the power supply device 100B sharing one dimming control circuit 600 are connected by a simple wiring.

  DC power supply circuit 200A includes an input rectifier circuit 210A and a DC / DC converter 220A. Since the configuration of the DC power supply circuit 200B is the same as that of the DC power supply circuit 200A, only the DC power supply circuit 200A will be described below, and the description of the DC power supply circuit 200B will be omitted.

  The input rectifier circuit 200A includes current fuses 1A and 2A, a diode bridge 3A, an input capacitor 4A, and a noise filter as necessary. An AC voltage from an AC power source AC (for example, commercial power source) is input to the input rectifier circuit 200A, and a full-wave rectified output from the diode bridge 3A is input to the DC / DC converter 220A.

  In this embodiment, the DC / DC converter 220A is an isolated flyback converter, and constitutes a so-called one-converter flyback step-down circuit having a power factor improving function. The DC / DC converter 220A includes a switching element 5A made of a MOSFET or the like, a transformer 6A, a resistor 7A, a diode 8A, and an output capacitor 9A (hereinafter also referred to as “capacitor 9A”). Hereinafter, the reference potential on the primary winding side of the transformer 6A is referred to as a primary side ground G1a (G1b in the power supply circuit 100B), and the reference potential on the secondary winding side is referred to as a secondary side ground G2. Since the DC / DC converter 220A is a power factor improving type, the output capacitor 9A has a smoothing function of low frequency ripple (ripple based on the input power supply frequency). Therefore, the capacity of the input capacitor 4A << the capacity of the output capacitor 9A. For example, the input capacitor 4A is a film capacitor, and the output capacitor 9A is an electrolytic capacitor.

  In the DC / DC converter 220A, energy is accumulated by the primary winding of the transformer 6A during the ON period of the switching element 5A, and the energy is transferred from the secondary winding side of the transformer 6A via the diode 8A during the OFF period of the switching element 5A. The capacitor 9A is charged. The output of the DC / DC converter 220A is determined by the on-duty (on width) in the PWM control of the switching element 5A, the turn ratio of the secondary winding to the primary winding of the transformer 6A, and the like. The switching element 5A is driven by a drive control circuit 500A (a switching control IC 10A described later), and the control IC 10A appropriately adjusts the driving state with reference to the current of the switching element 5A detected by the resistor 7A. In the following description, the output voltage and output current of the DC / DC converter 220A are referred to as “output voltage” and “output current”, respectively.

  The detection circuit 300A includes a voltage detection circuit including voltage detection resistors 11A, 12A, and 13A, and a current detection circuit including a current detection resistor 14A. The voltage detection resistors 11A, 12A and 13A are composed of a voltage dividing resistor circuit connected in parallel to the capacitor 9A of the DC / DC converter 220A, and a voltage proportional to the output voltage is generated in the resistor 13A. The current detection resistor 14A is a low resistance element inserted between the secondary side ground G2 and the terminal T4A, and a voltage proportional to the output current is generated in the current detection resistor 14. The configuration of the detection circuit 300B is the same as the configuration of the detection circuit 300A.

  The auxiliary power circuit 400A includes a primary side auxiliary winding including a transformer 6A, a primary side auxiliary power circuit including a diode 15A and a capacitor 16A, and a secondary side auxiliary winding including a secondary side auxiliary winding of the transformer 6A, a diode 17A and a capacitor 18A. A power supply circuit is provided. The auxiliary power circuit 400A generates control power for the drive control circuit 500A and the dimming control circuit 600 based on the switching operation of the switching element 5A. The voltage generated in the primary side auxiliary winding is rectified and smoothed by the diode 15A and the capacitor 16A, and this smoothed voltage is made constant by a series regulator, a Zener diode or the like (not shown) as necessary, and drive control is performed. It is supplied as the control voltage Vs1 of the primary side circuit of the circuit 500A. The voltage generated in the secondary side auxiliary winding is rectified and smoothed by the diode 17A and the capacitor 18B. The voltage of the capacitor 18B is supplied as the control voltage Vcc1 of the secondary side circuit of the drive control circuit 500A and the dimming control circuit 600. The control voltage Vcc1 may be supplied based on the voltage of the capacitor 9A in addition to or instead of the voltage obtained from the auxiliary winding of the transformer 6A. The configuration of the auxiliary power supply circuit 400B is the same as that of the auxiliary power supply circuit 400A, and the auxiliary power supply circuit 400B generates a primary side control voltage Vs2 and a secondary side control voltage Vcc2.

  The drive control circuit 500A has nodes A1, A2, Vs1, G1a, G2, Vcc1, A3, A4, and A5, which are nodes B1, B2, Vs2, G1b, G2, Vcc2, B3, V5 of the drive control circuit 500B. It corresponds to B4 and B5, respectively. The node A1 (B1) is connected to the gate of the switching element 5A (5B), and the node A2 (B2) is connected to the connection point between the source terminal of the switching element 5A (5B) and the resistor 7A (7B). The detection value of the output voltage and the detection value of the output current are input to the nodes A3 and A4 (B3 and B4) from the detection circuit 300A (300B), respectively. The target current value S1 (S2) from the dimming control circuit 600 is input to the node A5 (B5). The node G1a (G1b) has the same potential as the primary side ground G1a (G1b), and the node G2 has the same potential as the secondary side ground G2. The nodes Vs1 and Vcc1 (Vs2 and Vcc2) are at the same potential as the control voltages Vs1 and Vcc1 (Vs2 and Vcc2), respectively.

  FIG. 2 shows the drive control circuits 500A and 500B and the dimming control circuit 600. Since the configuration of the drive control circuit 500B is substantially the same as the configuration of the drive control circuit 500A, the drive control circuit 500A will be mainly described below. For the sake of clarification, the connection with respect to the control voltages Vcc1 and Vcc2, the secondary side ground G2, etc. is not shown.

  The primary side circuit of the drive control circuit 500A includes a control IC 10A and a photocoupler 26A (phototransistor portion). The control IC 10A performs PWM control of the switching element 5A with an ON width based on the output state of the phototransistor of the photocoupler 26A. Peripheral circuit components may be connected to the control IC 10A as necessary.

  The secondary circuit of the drive control circuit 500A includes a voltage regulator circuit 19A, operational amplifiers 20A and 21A, diodes 22A and 23A, resistors 24A and 25A, and a photocoupler 26A (photodiode portion). As an outline, the voltage regulator circuit 19A is composed of, for example, a series regulator, a three-terminal regulator, etc., and makes the control power supply Vcc1 constant. The operational amplifier 21A is a constant current control operational amplifier that has the function of making the output current constant, and the operational amplifier 20A is a constant voltage control operational amplifier that has the function of making the output voltage constant. Then, according to the output state of the DC / DC converter 220A, one of constant current control and constant voltage control is selected by the diode OR circuit composed of the diodes 22A and 23A, and the input state of the photocoupler 26A is determined. That is, the switching element 5A is PWM-controlled by the drive control circuit 500A so as to perform either constant current control or constant voltage control. However, in the following description, it is assumed that constant current control is selected unless otherwise specified.

  The current detection value detected by the current detection resistor 14A is input to the negative input terminal (−) of the operational amplifier 21A for constant current control, and the target value of the output current, that is, the current target value S1 is input to the positive input terminal (+). Is input from the dimming control circuit 600 (current adjustment circuit 620). Note that a feedback element (not shown) (a resistor, a capacitor, or a series or parallel circuit thereof) is connected between the negative input terminal and the output terminal of the operational amplifier 21A. The operational amplifier 21A amplifies and outputs an error between the current detection value input to the negative input terminal and the current target value input to the positive input terminal. In other words, when the diode 23A is turned on and the constant current control is selected, the operational amplifier 21A determines the ON width in the PWM control so that the detected current value matches the current target value.

  The voltage detection value detected by the voltage detection resistors 11A to 13A is input to the negative input terminal (−) of the operational amplifier 20A for constant voltage control, and the target value (voltage upper limit value) of the output voltage is input to the positive input terminal (+). ) Is input from the voltage source Vref. The voltage source Vref is a divided voltage of the output voltage of the voltage regulator 19A. Note that a feedback element (not shown) is also connected between the negative input terminal and the output terminal of the operational amplifier 20A. The operational amplifier 20A amplifies and outputs an error between the voltage detection value input to the negative input terminal and the upper limit value input to the positive input terminal. In other words, when the diode 22A is turned on and constant voltage control is selected, the operational amplifier 20A determines the ON width in the PWM control so that the voltage detection value matches the voltage upper limit value.

  The diode OR circuit composed of the diodes 22A and 23A is turned on with respect to the lower one of the output terminal voltage of the operational amplifier 20A and the output terminal voltage of the operational amplifier 20B. The common anode of the diode OR circuit is connected to the cathode side of the photodiode of the photocoupler 26A. The anode of the photodiode of the photocoupler 26A is connected to the output of the voltage regulator 19A via a resistor 24A, and the resistor 25A is connected in parallel to the photodiode. The resistor 24A may be inserted on the cathode side of the photodiode. An output current corresponding to the current (light emission) flowing through the photodiode flows through the phototransistor of the photocoupler 26A. As described above, the control IC 10A generates a PWM drive signal having a pulse width corresponding to the output state of the phototransistor of the photocoupler 26A, and outputs it as the gate voltage of the switching element 5A.

  The dimming control circuit 600 will be described with reference to FIGS. 1 and 2. The dimming circuit 600 includes diodes 27 and 28, a voltage regulator circuit 610, a current adjustment circuit 620 including a microcomputer, and a dimming input circuit 630. The dimming input circuit 630 includes resistors 29 to 31, a diode 32, and a photocoupler 33.

  The voltage regulator circuit 610 receives the control voltage Vcc1 generated by the auxiliary power supply circuit 400A via the diode 27 and the control voltage Vcc2 generated by the auxiliary power supply circuit 400B via the diode 28. The voltage regulator circuit 610 includes, for example, a three-terminal regulator, a series regulator, and the like, and generates a control power supply for the microcomputer of the current adjustment circuit 620 from the input control voltage Vcc1 or Vcc2. Here, the auxiliary power supply circuits 400A and 400B and the voltage regulator circuit 610 are configured so that the current adjustment circuit 620 can be operated by supplying one of the control voltages Vcc1 and Vcc2. In the present embodiment, a configuration in which both the diodes 27 and 28 are included in the power supply apparatus 100A is shown, but only the diode 27 may be included in the power supply apparatus 100A and the diode 28 may be included in the power supply apparatus 100B.

  In the dimming input circuit 630, the dimming signal (for example, AC 200 V signal) input from the terminals T 7 and T 8 is divided by the resistors 29 and 30 and the resistor 31, and half-wave rectified by the diode 32, and the photocoupler 33. Input to the photodiode. A current is generated in the phototransistor of the photocoupler 33 when the dimming signal is on, and no current is generated when the dimming signal is off.

  The current adjustment circuit 620 detects the dimming signal based on the current of the phototransistor of the photocoupler 33. As described above, in the present embodiment, it is assumed that all-light lighting is executed when the dimming signal is off, and dimming lighting is executed when the dimming signal is on. Therefore, when there is no output from the photocoupler 33, the current adjustment circuit 620 outputs current target values S1 and S2 corresponding to all-light lighting to the drive control circuits 500A and 500B, respectively, and there is an output from the photocoupler 33. In this case, the current target values S1 and S2 corresponding to the dimming lighting are output to the drive control circuits 500A and 500B, respectively. In the present embodiment, it is assumed that the current target values S1 and S2 at the time of all-light lighting are equal to each other, and the current target values S1 and S2 at the time of dimming lighting are also equal to each other.

  Therefore, the normal operation of the LED power supply device 100 and the LED lighting device 150 is as follows. In the dimming control circuit 600, current target values S1 and S2 are determined based on off / on of the dimming signal, and the current target values S1 and S2 are input to the drive control circuits 500A and 500B. Then, the drive control circuits 500A and 500B control the DC power supply circuits 200A and 200B (DC / DC converters 220A and 220B) according to the current target values S1 and S2, respectively, and the LEDs 70A and 70B are all lit / dimmed. Is done.

  Here, when the DC / DC converter 220A stops due to a failure of the DC power supply circuit 200A or the like, the LED 70A is turned off and the control voltage Vcc1 is not generated. Further, even when the output voltage becomes an overvoltage state (no load state) due to disconnection or the like of the LED 70A, the DC / DC converter 220A is intermittently driven by the operation of the operational amplifier 20A of the drive control circuit 500A, and the sufficient control voltage Vcc1. Is no longer generated. Here, assuming that the power supply device 100B is normal, the control voltage Vcc2 is generated by the operation of the DC / DC converter 220B, and the dimming control circuit 600 (current adjustment circuit 620) is operated by the control voltage Vcc2 as described above. To do. Therefore, the current target values S1 and S2 are input to the drive control circuits 500A and 500B, and only the drive control circuit 500B controls the DC power supply circuit 200B (DC / DC converter 220B) according to the current target value S2, and the LED 70B All-light lighting or dimming lighting is performed. Thereby, even when the DC power supply circuit 200A is stopped, the LED lighting device 150 is prevented from being turned off and the dimming control is executed.

  Similarly, when the DC / DC converter 220B stops due to a failure of the DC power supply circuit 200B, the LED 70B is turned off and the control voltage Vcc2 is not generated. Further, even when the output voltage becomes an overvoltage state (no load state) due to disconnection of the LED 70B or the like, the DC / DC converter 220B is in an intermittent drive state by the operation of the operational amplifier 20B of the drive control circuit 500B, and the sufficient control voltage Vcc2 Is no longer generated. Here, assuming that the power supply device 100A is normal, the control voltage Vcc1 is generated by the operation of the DC / DC converter 220A, and the dimming control circuit 600 (current adjustment circuit 620) is operated by the control voltage Vcc1 as described above. To do. Therefore, the current target values S1 and S2 are input to the drive control circuits 500A and 500B, and only the drive control circuit 500A controls the DC / DC converter 220A according to the current target value S1, and the LED 70A is turned on or dimmed. Lighting is performed. As a result, even when the DC power supply circuit 200B is stopped, the LED lighting device 150 is prevented from being turned off and the dimming control is executed.

  As described above, the LED power supply device 100 according to the present embodiment generates the DC output current from the AC power supply AC and supplies the output current to the LED 70A, and the DC power supply circuit 200A based on the current target value S1. A drive control circuit 500A for generating an output current, a DC power supply circuit 200B for generating a DC output current from the AC power supply AC and supplying the output current to the LED 70B, and an output current for the DC power supply circuit 200B based on the current target value S2. And a dimming control circuit 600 that determines the current target values S1 and S2 based on the input dimming signal and outputs the current target values S1 and S2 to the drive control circuits 500A and 500B, respectively. . The diodes 27 and 28 for supplying the control voltage Vcc1 generated based on the operation of the DC power supply circuit 200A and the control voltage Vcc2 generated based on the operation of the DC power supply circuit 200B to the dimming control circuit 600 are operation holding means. The dimming control circuit 600 is configured to be operable by supplying at least one of the control voltages Vcc1 and Vcc2. With this configuration, at least the following effects can be obtained.

(1) Cost reduction of apparatus and simplification of dimming wiring One dimming control circuit 600 is shared in two system outputs while ensuring the function of preventing the other system from being turned off by stopping one system. In the LED power supply device and the LED lighting device for two-line dimming output, the cost can be reduced and the dimming wiring can be simplified.

(2) Execution of reliable dimming control Even when the DC power supply circuit 200A or 200B is stopped, the control voltage of the dimming control circuit 600 is ensured, and thereby the current target value S2 or S1 is output. Therefore, even if the LEDs of one system are turned off, the dimming control of the LEDs of the other system is reliably executed.

(3) Simplification of wiring between power supply devices A power supply device 100A including a DC power supply circuit 200A, a drive control circuit 500A, and a dimming control circuit 600 is mounted on one substrate, and includes a DC power supply circuit 200B and a drive control circuit 500B. Power supply device 100B is mounted on the other substrate. With this configuration, a simple wiring connection between the power supply device 100A and the power supply device 100B sharing one dimming control circuit 600 is possible.

<Second Embodiment>
In the first embodiment, when the DC power supply circuit 200A (200B) of one system stops, the DC power supply circuit 200B (200A) of the other system performs all-light lighting or dimming lighting according to the dimming signal. The configuration to do is shown. In the present embodiment, a configuration is shown in which when the DC power supply circuit 200A (200B) of one system is stopped, the DC power supply circuit 200B (200A) of the other system increases the output current or performs all-light lighting. The dimming control circuit 600 is different between the present embodiment and the first embodiment, and other components are the same.

  FIG. 3 shows drive control circuits 500A and 500B and a dimming control circuit 600 in the LED power supply apparatus 100 of this embodiment. The dimming control circuit 600 of the present embodiment includes control voltage detection means for detecting the supply state of the control voltages Vcc1 and Vcc2. As an example of the configuration relating to the control voltage detection means, the control voltage Vcc1 is input to the current adjustment circuit 620 via a voltage dividing circuit made up of resistors 34 and 35, and the control voltage Vcc2 is passed through a voltage dividing circuit made up of resistors 36 and 37. To the current adjustment circuit 620. Further, if necessary, a circuit for limiting the voltage applied to the microcomputer of the current adjustment circuit 620 may be added. Thereby, in the current adjustment circuit 620, the presence or absence of the control voltages Vcc1 and Vcc2 is detected as the detection signals d1 and d2, respectively. For the sake of clarity of illustration, the connection with respect to the control voltages Vcc1 and Vcc2, the secondary side ground G2, etc. is not shown.

  Here, when the DC / DC converter 220A is stopped due to a failure of the DC power supply circuit 200A or the like on the power supply device 100A side, the LED 70A is turned off and the control voltage Vcc1 is not generated. Further, even when the output voltage becomes an overvoltage state (no load state) due to disconnection or the like of the LED 70A, the DC / DC converter 220A is intermittently driven by the operation of the operational amplifier 20A of the drive control circuit 500A, and the sufficient control voltage Vcc1. Is no longer generated. Therefore, the detection signal d1 becomes a low level, and the current adjustment circuit 620 can detect that the control power Vcc1 is not substantially supplied and that the LED 70A is in the extinguished state. Similarly, when the sufficient control voltage Vcc2 is not generated on the power supply device 100B side, the detection signal d2 becomes low level, and the current adjustment circuit 620 indicates that the control power supply Vcc2 is not substantially supplied, and thus the LED 70B is turned off. It can detect that it is in a state.

  When detecting that the control voltage Vcc1 is not substantially supplied, the current adjustment circuit 620 increases the current target value S2 to a predetermined current target value S2 ′. In this case, the value of the current target value S1 is arbitrary, but the output is preferably stopped to reduce power consumption. Similarly, when it is detected that the control voltage Vcc2 is not substantially supplied, the current adjustment circuit 620 increases the current target value S1 to a predetermined current target value S1 ′. In this case, the value of the current target value S2 is also arbitrary, but the output is preferably stopped to reduce power consumption.

  The predetermined current target values S1 ′ and S2 ′ may be values corresponding to the total light output, for example. In this case, S2 = S2 ′ when the all-light output is performed before the control voltage Vcc1 is decreased, and S1 = S2 ′ when the all-light output is performed before the control voltage Vcc2 is decreased. S1 ′. Further, the predetermined current target values S1 ′ and S2 ′ are in consideration of the balance with the emission luminance of other normal LED lighting devices 150 connected to the same dimming signal generation source D and arranged along the road. It may be determined. For example, when the dimming rate indicated by the dimming signal from the dimming signal generation source D to each LED lighting device 150 is Dx%, the predetermined current target values S1 ′ and S2 ′ are 1.5 × Dx%. May be set to a value corresponding to the dimming rate. For example, when Dx% is 50%, the dimming rate indicated by the current target values S1 ′ and S2 ′ is 75%. Here, the predetermined current target values S1 ′ and S2 ′ are the current target values corresponding to all-light lighting, taking into account the lifetime of the LEDs 70A and 70B, the derating of each component constituting the DC power supply circuits 200A and 200B, and the like. A higher value (for example, a value corresponding to a light control rate of 150%) may be set.

  As described above, according to the present embodiment, the dimming control circuit 620 includes the voltage dividing circuits 34 to 37 that detect the supply state of the control voltages Vcc1 and Vcc2, and the control voltage Vcc1 is not substantially supplied. Is detected, the current target value S2 is increased or determined to be a value corresponding to the total light output, and the current target value S1 is increased when it is detected that the control voltage Vcc2 is substantially not supplied. Or a value corresponding to the total light output. Therefore, in the present embodiment, in addition to the effects of (1) cost reduction and simplification of the dimming wiring and (3) simplification of the wiring between the power supply devices described above with respect to the first embodiment, the following effects are obtained. can get.

(4) Reduction of dimming level when one system is turned off Even when one of the LEDs 70A or 70B of one system is turned off, the LED 70B or 70A of the other system is brightened or becomes an all-light state. The dimming degree as a whole, that is, the LED lighting device 150 as a whole is reduced.

<Third Embodiment>
In the first and second embodiments, the dimming control circuit 600 operates by receiving the supply of the control voltage Vcc1 and the control voltage Vcc2. However, in the present embodiment, the dimming control circuit 600 has the control voltage. A configuration in which only the supply of Vcc1 is received is shown. The drive control circuit 500B and the dimming control circuit 600 are different between the present embodiment and the first embodiment, and the other components are the same.

  FIG. 4 shows drive control circuits 500A and 500B and a dimming control circuit 600 in the LED power supply apparatus 100 of the present embodiment. The dimming control circuit 600 of this embodiment is supplied with the control voltage Vcc1 generated by the auxiliary power supply circuit 400A based on the operation of the DC / DC converter 220A, and is not supplied with the control voltage Vcc2. Therefore, the wiring W3 in FIG. 1 is unnecessary. In the drive control circuit 500B, the resistors 39B and 40B are connected to the positive input terminal of the operational amplifier 21B via the resistor 38B, and the current adjustment circuit 620 is further connected to the node B5. The resistors 39B and 40B are voltage dividing circuits and divide the output voltage of the voltage regulator circuit 19B. Therefore, the current target value S2 is set such that all-light lighting or dimming lighting is executed in a state where the resistors 38B to 40B are connected. For the sake of clarity, the connection with respect to the control voltage Vcc1 and the secondary side ground G2 is not shown.

  Here, when the DC / DC converter 220A stops due to a failure of the DC power supply circuit 200A or the like, the LED 70A is turned off and the control voltage Vcc1 is not generated. Further, even when the output voltage becomes an overvoltage state (no load state) due to disconnection or the like of the LED 70A, the DC / DC converter 220A is intermittently driven by the operation of the operational amplifier 20A of the drive control circuit 500A, and the sufficient control voltage Vcc1. Is no longer generated. Therefore, the current adjustment circuit 620 stops operating and does not output the current target values S1 and S2. As a result, the node B5 of the drive control circuit 500B is opened, and a fixed voltage value determined by the voltage dividing circuit of the resistors 39B and 40B is input as a current target value to the negative input terminal of the operational amplifier 21B. The drive control circuit 500B controls the DC power supply circuit 200B according to the fixed current target value, and the LED 70B is turned on.

  The fixed voltage value needs to be set to at least a value for not turning off the LED 70B. Preferably, the fixed voltage value may be set to a value corresponding to the current target value for all-light lighting, or may be set in consideration of the lifetime of the LED 70B, derating of each component constituting the DC power supply circuit 200B, and the like. You may set to the value exceeding the electric current target value of lighting.

  On the other hand, the operation state of the power supply apparatus 100B does not affect the operation of the power supply apparatus 100A. Therefore, as in the case of the first embodiment, even when the power supply device 100B (DC power supply circuit 200B) is stopped, the power supply device 100A causes the LED 70A to be all-lighted or dimmed based on the dimming signal.

  As described above, according to the present embodiment, the diode 27 that supplies the dimming control circuit 620 with the control voltage Vcc1 generated based on the operation of the DC power supply circuit 200A, and the power supply device 100A (the DC power supply circuit 200A and the dimming control). When the control circuit 620) stops operating, the resistors 39B and 40B that output a fixed voltage value generated from the control voltage Vcc2 generated based on the operation of the DC power supply circuit 200B as the current target value S2 are operation holding means. It is provided as. Thereby, in this embodiment, in addition to the effects of (1) cost reduction and simplification of the dimming wiring described above with respect to the first embodiment, the following effects can be obtained.

(3α) Further simplification of wiring between power supply devices Wiring for connecting the control voltage Vcc2 from the power supply device 100B not including the dimming control circuit 600 to the power supply device 100A including the dimming control circuit 600 is provided. Can be omitted. Therefore, it is possible to further simplify the wiring between the power supply apparatus 100A (the dimming control circuit 600) and the power supply apparatus 100B.

(5) Reduction of dimming degree when one system is turned off The fixed voltage value as the current target value is set to a value equal to or higher than the current target value corresponding to the total light output. Therefore, even when the LED 70A of one system is turned off, the LED 70B of the other system is in an all-light state or a light-intensifying state, so that the dimming degree of the entire LEDs 70A and 70B, that is, the LED lighting device 150 as a whole is reduced. Is done.

<Modification>
Although preferred embodiments of the present invention have been described above, the present invention can be modified into various modes as shown below, for example.

(1) Modification of output current control In each of the above embodiments, the configuration in which the output current is constant-current controlled (feedback control) in each power supply apparatus has been described. However, as shown in FIG. A configuration is also possible. FIG. 5 shows a circuit configuration when feedforward control is applied in the first embodiment. As shown in FIG. 5, the reference potentials of the drive control circuits 500A and 500B are the same primary side ground G1, and the primary side control voltages Vs1 and Vs2 are supplied to the dimming control circuit 620, and the secondary side control voltage is supplied. Is not generated. The target current values S1 and S2 are directly input to the control ICs 10A and 10B, respectively. Also in the second and third embodiments, feedforward control as shown in FIG. 5 can be applied.

(2) Modification of DC / DC converters 220A and 220B In each of the above embodiments, the power factor improving type isolated flyback converter is adopted as the DC / DC converters 220A and 220B, but the power factor improving circuit (boost chopper circuit). Other types of converter circuits such as a combination of a flyback converter and a combination of a power factor correction circuit (a step-up chopper circuit) and a step-down chopper circuit may be employed.

(3) Modification of Auxiliary Power Supply Circuits 400A and 400B In the above embodiments, the control voltages Vcc1 and Vcc2 are set to constant voltages in the drive control circuits 500A and 500B and the dimming control circuit 600, respectively. The power supply circuits 400A and 400B may be configured such that each control voltage is constant. In this case, the constant control voltage is supplied to the drive control circuits 500A and 500B and the dimming control circuit 600, respectively, so that the voltage regulator circuits 19A, 19B and 610 are not necessary.

(4) Modification of Arrangement of Dimming Control Circuit 600 In each of the above embodiments, the dimming control circuit 600 is included in the power supply device 100A as a configuration that simplifies the wiring between the power supply device 100A and the power supply device 100B. As shown, a configuration in which the dimming control circuit 600 is provided separately from the power supply devices 100A and 100B is also possible. That is, the dimming control circuit 600 may be mounted on a third substrate different from the substrate on which the power supply devices 100A and 100B are mounted. In this case, wiring between the dimming control circuit 600 and the power supply apparatus 100A and between the dimming control circuit 600 and the power supply apparatus 100B is required, but the power supply apparatus 100A is replaced due to a failure or the like. In addition, since the use of the dimming control circuit 600 can be continued, the maintenance cost can be reduced.

(5) Modification of Dimming Signal In each of the above embodiments, an AC power supply (for example, AC 200V) signal is exemplified as the dimming signal. However, as described above with respect to the dimming input circuit 630, the dimming signal is a PWM signal. There may be. In this case, in the dimming input circuit 630, an integrating circuit (smoothing circuit) is provided before or after the photocoupler 33, and the effective value or average value of the PWM signal is input to the current adjustment circuit 620 as an analog value. The current adjustment circuit 620 can determine the dimming rate, that is, the current target values S1 and S2 according to the analog value.

27, 28 Diode (operation holding means)
34, 35, 36, 37 Resistance (control voltage detection means)
39B, 40B resistance (operation holding means)
70A, 70B LED
100 LED power supply device 100A, 100B power supply device 150 LED lighting device 200A, 200B DC power supply circuit 300A, 300B detection circuit 400A, 400B auxiliary power supply circuit 500A, 500B drive control circuit 600 dimming control circuit 610 voltage regulator circuit 620 current regulator circuit 630 Dimming input circuit 700A, 700B LED module

Claims (8)

An LED power supply,
A first DC power supply circuit that generates a first DC output current from an AC power supply and supplies the first output current to the first LED;
A first drive control circuit for causing the first DC power supply circuit to output the first output current based on a first current target value;
A second DC power supply circuit for generating a second output current of DC from the AC power supply and supplying the second output current to the second LED;
A second drive control circuit for causing the second DC power supply circuit to output the second output current based on a second current target value;
Dimming that determines the first and second current target values based on the input dimming signal and outputs the first and second current target values to the first and second drive control circuits, respectively. A control circuit;
When the first DC power supply circuit is stopped, the second current target value is held at a predetermined value, and when the second DC power supply circuit is stopped, the first current target value is set to a predetermined value. The LED power supply device provided with the operation holding means to hold in.   2. The LED power supply device according to claim 1, wherein the operation holding means is based on a first control voltage generated based on an operation of the first DC power supply circuit and an operation of the second DC power supply circuit. An LED comprising a circuit for supplying the generated second control voltage to the dimming control circuit, wherein the dimming control circuit is configured to be operable by supplying one of the first and second control voltages; Power supply.   3. The LED power supply device according to claim 2, wherein the dimming control circuit includes control voltage detection means for detecting a supply state of the first and second control voltages, and the first control voltage is substantially equal. When it is detected that the supply is stopped, the second current target value is increased, or the second current target value is determined to be a value corresponding to the total light output, and the second control voltage is substantially An LED configured to increase the first current target value or to determine the first current target value to a value corresponding to the total light output when it is detected that the power supply is no longer supplied Power supply.   2. The LED power supply device according to claim 1, wherein the operation holding unit supplies a first control voltage generated based on an operation of the first DC power supply circuit to the dimming control circuit; When the first DC power supply circuit and the dimming control circuit stop operating, the fixed voltage value generated from the second control voltage generated based on the operation of the second DC power supply circuit is LED power supply apparatus provided with the circuit which outputs as 2 electric current target values.   5. The LED power supply device according to claim 4, wherein the fixed voltage value is set to a value equal to or greater than a current target value corresponding to all light output. The LED power supply device according to any one of claims 1 to 5,
A first current detection circuit that detects the first output current and outputs a first current detection value;
And a second current detection circuit that detects the second output current and outputs a second current detection value, wherein the first drive control circuit includes the first current detection value and the first current detection value. The first output current is configured to be constant current controlled so that the current target values of the second current control value coincide with each other, and the second drive control circuit determines that the second current detection value and the second current target value are An LED power supply device configured to perform constant current control on the second output current so as to match.   The LED power supply device according to any one of claims 1 to 6, wherein the first power supply device including the first DC power supply circuit, the first drive control circuit, and the dimming control circuit is a first power supply device. An LED power supply device mounted on a substrate, wherein a second power supply device including the second DC power supply circuit and the second drive control circuit is mounted on a second substrate. LED lighting comprising the LED power supply device according to any one of claims 1 to 7, a first LED module having the first LED, and a second LED module having the second LED. apparatus.

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