JP2018037233A - LED lighting device and LED lighting device - Google Patents

Abstract

In an LED lighting device including a plurality of lighting circuits that respectively light a plurality of LED arrays, the plurality of LED arrays can be lighted simultaneously. An LED lighting device includes a first DC / DC converter that causes a first output voltage to reach a first forward voltage of a first LED array after a first time has elapsed since power-on. The first lighting circuit 10 having the first lighting circuit 10 is connected to the same power source as the first lighting circuit, and the second LED array 25 receives the second output voltage after the second time shorter than the first time since the power-on. A second lighting circuit 20 having a second DC / DC converter 22 capable of reaching a second forward voltage of the second forward voltage, and a second forward voltage after a first time after the power is turned on. A standby circuit 30 is provided to maintain the second output voltage below the second forward voltage before the first output voltage reaches the first forward voltage so as to reach the voltage. [Selection] Figure 1

Description

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

Patent Document 1 discloses a light source lighting device having a plurality of output systems. The light source lighting device includes a first LED array, a second LED array having a chromaticity different from that of the first LED array, first and second lighting circuits for lighting the first and second LEDs, respectively. Control means for controlling each lighting circuit so as to dim the first and second LEDs, respectively. As a result, a plurality of LEDs having different chromaticities are lit and their light outputs are mixed to obtain a light output of intermediate chromaticity as a whole.

Japanese Patent No. 5675114

  However, in general, the forward voltage Vf of LEDs having different chromaticities is different, and the number of LED elements connected in series in the LED array of each chromaticity may be different. Therefore, the total forward voltage of LED arrays with different chromaticities is likely to be different from each other. Therefore, if the timing at which the output voltage reaches the forward voltage of the LED array differs between the lighting circuits for the LED arrays of the respective chromaticities, the mixed color becomes uneven at the start of lighting, and good visual properties are obtained. Cannot be obtained. The problem of the time difference between the start of lighting is not limited to the configuration for color mixing, but is a problem common to a multi-system configuration in which a plurality of LED arrays should start lighting simultaneously by a plurality of lighting circuits.

  Therefore, an object of the present invention is to enable a plurality of LED arrays to be simultaneously turned on in an LED lighting device and an LED lighting device including a plurality of lighting circuits that respectively light the plurality of LED arrays.

  The LED lighting device according to the present disclosure includes a first DC / DC converter that causes the first output voltage to reach the first forward voltage of the first LED array after a first time has elapsed since power-on. The second output voltage is connected to the same power source as the lighting circuit and the first lighting circuit, and the second output voltage is set to the second forward direction of the second LED array after a second time shorter than the first time from the power-on. A second lighting circuit having a second DC / DC converter capable of reaching a voltage, and a second output voltage so that the second forward voltage reaches a second forward voltage after a first time after power-on. A standby circuit that maintains the second output voltage below the second forward voltage before the one output voltage reaches the first forward voltage.

  According to the LED lighting device of the present disclosure, the first output voltage reaches the first forward voltage so that the second output voltage reaches the second forward voltage after a first time from power-on. Previously, the second output voltage is maintained below the second forward voltage. Thereby, the timing at which the first and second output voltages reach the first and second forward voltages, respectively, becomes equal, and the time difference between the start of lighting of the first and second LED arrays can be eliminated. Therefore, in the LED lighting device including a plurality of lighting circuits that respectively light the plurality of LED arrays, the plurality of LED arrays can be lit simultaneously.

  In the LED lighting device according to the first aspect, the first lighting circuit further includes a first detection circuit that detects the first output voltage, and the second lighting circuit detects the second output voltage. And a control circuit for controlling the second DC / DC converter so that the second output voltage matches the target voltage, and the standby circuit converts the target voltage to the second forward voltage after power-on. Less than the standby voltage, and when the first output voltage exceeds the standby release voltage less than the first forward voltage, the target voltage is switched to a voltage higher than the second forward voltage. The standby voltage and the standby release voltage are set so that the output voltage of the first voltage reaches the second forward voltage after a first time from the power-on. Thus, since the second output voltage is maintained at a standby voltage lower than the second forward voltage until the first output voltage exceeds the standby release voltage, the standby voltage and the standby release voltage are set by The second output voltage can reach the second forward voltage after a first time from power on. Therefore, the timing when the first and second output voltages reach the first and second forward voltages, respectively, that is, the lighting start timing of the first and second LED arrays can be matched with high accuracy. Become.

  Here, the difference between the first forward voltage and the standby release voltage or the difference between the second forward voltage and the standby voltage is preferably 5 V or more and 15 V or less. By such a difference, the voltage difference from the cancellation of the standby state of the second output voltage to the arrival of the second forward voltage is reduced, and the lighting time difference due to the variation in the first or second output voltage is reduced. Generation can be suppressed. In addition, erroneous lighting of the second LED array due to variations in the second forward voltage or non-lighting of the second LED array due to variations in the first forward voltage can be prevented. Therefore, the lighting start timing coincides with high accuracy.

  In the LED lighting device of the second form, the second lighting circuit determines the second DC / DC converter so that the second output voltage matches the detection circuit and the second output voltage to match the target voltage. The control circuit further includes a voltage controllable circuit. The standby circuit uses the value obtained by subtracting the second time from the first time as a standby time, and the standby circuit sets the target voltage to a standby voltage lower than the second forward voltage after power-on. And the target voltage is switched to a voltage equal to or higher than the second forward voltage after elapse of the standby time after the second output voltage reaches the standby voltage. In this way, the time difference between the start of lighting of the first LED array and the start of lighting of the second LED array is acquired in advance, and the second output voltage is less than the second forward voltage for the standby time corresponding to this time difference. The standby voltage is maintained, whereby the second output voltage reaches the second forward voltage after a first time from power-on. Therefore, the timing at which the first and second output voltages reach the first and second forward voltages, respectively, that is, the lighting start timing of the first and second LED arrays can be matched with a simple configuration. It becomes.

  In the LED lighting device according to the third aspect, the standby circuit starts the second DC / DC converter after the standby time has elapsed since the power was turned on, with the value obtained by subtracting the second time from the first time as the standby time. Configured as follows. In this way, the time difference between the start of lighting of the first LED array and the start of lighting of the second LED array is acquired in advance, and the start-up of the second DC / DC converter is delayed by the standby time corresponding to this time difference. Thus, the second output voltage reaches the second forward voltage after a first time from the power-on. Therefore, the timing at which the first and second output voltages reach the first and second forward voltages, respectively, that is, the lighting start timing of the first and second LED arrays can be matched with a simple configuration. It becomes.

  The LED lighting device of the 4th form is the 1st lighting detection part which detects the lighting start of the 1st LED array, the 2nd lighting detection part which detects the lighting start of the 2nd LED array, and the 1st lighting A time difference calculation unit that calculates a difference between the lighting start time of the first LED array detected by the detection unit and the lighting start time of the second LED array detected by the second lighting detection unit, and the difference decreases. As described above, a compensation circuit including a setting update unit that updates the setting of the standby release voltage, the standby voltage, or the standby time is further provided. As described above, the standby release voltage, the standby voltage, or the standby time is optimized for each lighting operation, and the time difference between the start of lighting of the first and second LED arrays is always minimized. Therefore, according to the above configuration, the time-dependent change and individual variation in the rising speed of the output voltage of the first and second DC / DC converters and the time-dependent change and individual variation of the forward voltage of the first and second LED arrays are caused. The deviation of the lighting start timing is appropriately compensated, and the lighting start timings of the first and second LED arrays can be matched with higher accuracy.

  The LED lighting device of the present disclosure includes any one of the above LED lighting devices and an LED unit provided with the first and second LED arrays, and includes the chromaticity of the first LED array and the second LED array. Unlike the chromaticity, the first LED array and the second LED array are arranged for color mixing. Thereby, since the first and second LED arrays are turned on simultaneously, a uniform mixed emission color can be obtained from the beginning of lighting, and good visual illumination can be realized.

It is a circuit diagram which shows the LED lighting device and LED lighting apparatus of 1st Embodiment. It is a figure explaining an example of operation | movement of the LED lighting device of 1st Embodiment. It is a figure explaining the other example of operation | movement of the LED lighting device of 1st Embodiment. It is a circuit diagram which shows the LED lighting device and LED lighting apparatus of 2nd Embodiment. It is a figure explaining an example of operation | movement of the LED lighting device of 2nd Embodiment. It is a figure explaining the other example of operation | movement of the LED lighting device of 2nd Embodiment. It is a circuit diagram which shows the LED lighting device and LED lighting apparatus of 3rd Embodiment. It is a figure explaining an example of operation | movement of the LED lighting device of 3rd Embodiment. It is a figure explaining the other example of operation | movement of the LED lighting device of 3rd Embodiment. It is a block diagram which shows the compensation circuit etc. of the LED lighting device by 4th Embodiment. It is a block diagram which shows the compensation circuit etc. of the LED lighting device by 4th Embodiment.

<First Embodiment>
In FIG. 1, the circuit diagram of the LED lighting device 1 by the 1st Embodiment of this invention and the LED lighting apparatus 3 using the same is shown. The LED lighting device 3 includes an LED lighting device 1 and an LED unit 2, and the LED lighting device 1 is fed from an AC power source AC such as a commercial power source and supplies a predetermined DC output to the LED unit 2. The LED lighting device 1 includes lighting circuits 10 and 20 and a standby circuit 30, and the LED unit 2 includes LED arrays 15 and 25. The lighting circuits 10 and 20 are connected in parallel to the AC power source AC and light the LED arrays 15 and 25, respectively.

  The LED arrays 15 and 25 have different chromaticities, and in the LED unit 2, the LED elements constituting the LED array 15 and the LED elements constituting the LED array 25 are mixedly and dispersedly arranged for color mixing. Is done. The LED arrays 15 and 25 have different forward voltages. In the following description, the forward voltage of the LED array 15 is denoted as Vf1, and the forward voltage of the LED array 25 is denoted as Vf2.

  The lighting circuit 10 includes an input circuit 11, a DC / DC converter 12, a detection circuit 13, and a control circuit 14, and the lighting circuit 20 includes an input circuit 21, a DC / DC converter 22, a detection circuit 23, and a control circuit 24. The lighting circuits 10 and 20 have the same configuration except for connection wiring to the standby circuit 30 and circuit constants. Therefore, in the following, the lighting circuit 20 will be mainly described on behalf of the lighting circuits 10 and 20, but by replacing the maximum digit number of each symbol in the description of the lighting circuit 20 from 2 to 1, the lighting circuit 10 The explanation of is valid.

  The input circuit 21 includes a diode bridge 211 and an input capacitor 212. The AC input voltage is full-wave rectified by the diode bridge 211, and a pulsating voltage appears in the input capacitor 212. Note that the input circuit 21 may be omitted when a DC voltage from a DC power source is input to the LED lighting device 1.

  The DC / DC converter 22 includes a switching element 221 (MOSFET), a transformer 222, a diode 223, and a smoothing capacitor 224, and supplies DC power to the LED array 25 by PWM driving of the switching element 221. In this embodiment, the DC / DC converter 22 is an isolated flyback converter, and constitutes a so-called one-converter flyback circuit having a power factor improving function. The DC / DC converter 22 may be another type of converter such as a buck converter or a buck boost converter, or a power factor correction circuit may be added. The primary side reference potential (potential of the low potential side node of the input capacitor 112/212) of the DC / DC converter 12/22 is called primary side ground G1p / G2p, respectively, and the secondary side reference potential (smoothing capacitor 124/224). (The potential of the low potential side node) is referred to as secondary side ground G1s / G2s.

  Energy is accumulated by the primary winding of the transformer 222 during the on period of the switching element 221, and the energy is charged to the smoothing capacitor 224 from the secondary winding side of the transformer 222 via the diode 223 during the off period of the switching element 221. . The output power of the DC / DC converter 22 is determined by the on-duty (duty ratio) in the PWM control of the switching element 221, the turn ratio of the secondary winding to the primary winding, and the like. The switching element 221 is driven by a control IC 251 for switching control described later. In the following description, the output voltages of the DC / DC converters 12 and 22 are referred to as output voltages V1 and V2, respectively, and the output currents of the DC / DC converters 12 and 22 are referred to as output currents I1 and I2, respectively.

  Further, the lighting circuit 10/20 has an auxiliary power circuit (not shown). This auxiliary power supply circuit uses one or both of a voltage obtained by rectifying and smoothing a voltage generated in the auxiliary winding of the transformer 122/222 or a voltage obtained by dropping the voltage generated in the capacitor 124/224 as the control power supply Vcc1 of the control circuit 14/24. / Vcc2 is generated.

  The detection circuit 23 includes a voltage detection circuit including resistors 231 and 232 and a current detection circuit including a current detection resistor 33. The voltage detection circuit (resistors 231 and 232) is a voltage dividing resistor circuit connected in parallel to the output capacitor 224, and a voltage proportional to the output voltage is generated in the resistor 232. The current detection resistor 233 includes a low resistance element, and a voltage proportional to the output current is generated in the low resistance element.

  The control circuit 24 includes operational amplifiers 241 and 242, resistors 243 and 244, diodes 245 and 246, resistor 247, photocoupler 248 (photodiode 249 and phototransistor 250), control IC 251 and variable voltage source 252. The pre-stage circuit of the photodiode 249 receives the supply of the control power supply Vcc2 and operates with the secondary side ground G2s as a reference potential. The subsequent circuit of the phototransistor 250 operates with the primary side ground G2p as a reference potential in response to the supply of a primary side control power supply (not shown). In general, the operational amplifier 241 is a constant voltage control operational amplifier that has a function of making the output voltage V2 constant, and the operational amplifier 242 is a constant current control operational amplifier that has a function of making the output current I2 constant. Note that the circuit configuration of the control circuit 24 shown in the present embodiment is an exemplification, and other forms of circuit configurations may be employed as long as the circuit has the same function as this circuit configuration.

  The detection voltage detected by the detection circuit 23 (resistors 231 and 232) is input to the negative input terminal (−) of the operational amplifier 241 for constant voltage control, and the target voltage (upper limit) of the output voltage is input to the positive input terminal (+). Voltage) is input from the voltage dividing points of the resistors 243 and 244. Note that a feedback element (not shown) (a resistor, a capacitor, or a series circuit or a parallel circuit thereof) is connected between the negative input terminal and the output terminal of the operational amplifier 241. The operational amplifier 241 amplifies and outputs an error between the detection voltage input to the negative input terminal and the target voltage input to the positive input terminal. In other words, when the diode 245 is turned on and the constant voltage control is selected, the operational amplifier 241 determines the output terminal voltage so that the detected voltage matches the target voltage.

  The detection current detected by the detection circuit 23 (current detection resistor 233) is input to the negative input terminal (−) of the operational amplifier 242 for constant current control, and the target of the output current (target current) is input to the positive input terminal (+). ) Is input from the variable voltage source 252. Note that a feedback element (not shown) is also connected between the negative input terminal and the output terminal of the operational amplifier 242. The operational amplifier 242 amplifies and outputs an error between the detection current input to the negative input terminal and the target current input to the positive input terminal. In other words, when the diode 246 is turned on and the constant current control is selected, the operational amplifier 242 determines the output terminal voltage so that the detected current matches the target current. Each of the variable voltage sources 152 and 252 includes, for example, a microcomputer, and adjusts the ratio between the output current I1 and the output current I2 (the dimming rates of the LED arrays 15 and 25) according to an external signal. Thereby, the chromaticity of the LED arrays 15 and 25 as a whole, that is, the chromaticity of the mixed color as the LED unit 2 is adjusted.

  The diode OR circuit composed of the diodes 245 and 246 is turned on with respect to the lower one of the output terminal voltage of the operational amplifier 241 and the output terminal voltage of the operational amplifier 242. The common anode of the diode OR circuit is connected to the cathode side of the photodiode 249. A control voltage Vcc2 is supplied to the anode of the photodiode 249 through the resistor 247. An output current corresponding to the current (light emission) flowing through the photodiode 249 flows through the phototransistor 250.

  The control IC 251 includes a general LED driver IC, and peripheral circuit elements (not shown) are appropriately connected to the control IC 251. The control IC 251 generates a PWM drive signal having a pulse width corresponding to the output state of the phototransistor 250 and outputs it as the gate voltage of the switching element 221. For example, the control IC 251 decreases / increases the on width of the PWM control to increase / decrease the current of the phototransistor 250, and decreases / increases the output current or output voltage.

  Thereby, after the rising period of the DC / DC converter 22 (that is, during stable operation), the control circuit 24 performs constant voltage control for matching the detection voltage with the target voltage or constant current for matching the detection current with the target current. Execute control. On the other hand, during the rising period of the DC / DC converter 22, since the detected voltage and the detected current are less than the target voltage and the target current, respectively, the control circuit 24 operates the DC / DC converter 22 in the maximum output state (that is, Drive with maximum on-duty). Therefore, during the rising period of the DC / DC converter 22, the output voltage V2 increases exclusively according to the output capability of the DC / DC converter 22.

  The standby circuit 30 includes a photocoupler 300 (photodiode 301 and phototransistor 302), a comparator 310, a transistor 320, resistors 311, 315 and 321, and a voltage source 312. A detection voltage from the detection circuit 23 (that is, a voltage of the voltage dividing resistor 232) is input to the photodiode 301, and a current having a magnitude corresponding to the detection voltage flows to the phototransistor 302. The reference potential in the circuit on the phototransistor 302 side is the secondary side ground G2s. In the present embodiment, the lighting circuits 10 and 20 have secondary grounds G1s and G2s having different potentials. However, when the lighting circuits 10 and 20 have a common secondary ground, a photocoupler is used. 300 may be omitted.

  In the comparator 310, the voltage of the resistor 311 that increases according to the current of the phototransistor 302 is input to the positive input terminal, and the voltage of the voltage source 312 is input to the negative input terminal. The voltage source 312 may be a divided value of the control voltage Vcc2. The voltage of the resistor 311 corresponds to the voltage of the output voltage V1, and the voltage of the voltage source 312 corresponds to a predetermined voltage less than the forward voltage Vf1 of the LED array 15. Hereinafter, this predetermined voltage is referred to as standby release voltage Vr. Thus, the output terminal of the comparator 310 is low level (zero) when the output voltage V1 is equal to or lower than the standby release voltage Vr, and is high level (open) when the output voltage V1 exceeds the standby release voltage Vr. Become.

  The transistor 320 is turned on when the output of the comparator 310 is at a high level, and the resistor 321 is connected in parallel to the resistor 244 of the control circuit 24. As a result, when the output of the comparator 310 is at a high level (when the transistor 320 is off), the target voltage for constant voltage control by the operational amplifier 241 decreases. Hereinafter, the target voltage with the transistor 320 turned off is referred to as a normal target voltage Vn, and the target voltage with the transistor 320 turned on is referred to as a standby voltage Vs. Note that the functions of the comparator 310 and the transistor 320 can be replaced by a microcomputer. In this case, the voltage at the non-inverting input terminal of the operational amplifier 241 (that is, the standby voltage Vs) can be a continuously variable value.

  FIG. 2A illustrates an example of the operation of the LED lighting device 1 of the present embodiment. In FIG. 2A, the upper stage shows the output voltage V1 (broken line) and the output voltage V2 (solid line), the lower stage shows the operating state of the transistor 320, and the horizontal axis is time. In the present embodiment, the DC / DC converters 12 and 22 are activated simultaneously. The rising speeds of the output voltages V1 and V2 depend on the output capacities of the DC / DC converters 12 and 22, respectively, and in particular the capacities of the smoothing capacitors 114 and 214. In this example, the smoothing capacitors 114 and 214 have substantially the same capacity, and the rising speed of the output voltage V1 and the rising speed of the output voltage V2 are the same.

The setting of each voltage in the present embodiment is as follows (however, the embodiment is not limited to these numerical values).
The forward voltage Vf1 is 100V.
The forward voltage Vf2 is 50V.
The target voltage for the output voltage V1 is a voltage (for example, 120V) higher than the forward voltage Vf1.
The standby release voltage Vr (the voltage that causes the transistor 320 to transition from the off state to the on state) with respect to the output voltage V1 is 90 V that is less than the forward voltage Vf1.
The normal target voltage Vn (target voltage when the transistor 320 is off) with respect to the output voltage V2 is higher than the forward voltage Vf2 (for example, 70V).
The standby voltage Vs (the target voltage when the transistor 320 is on) with respect to the output voltage V2 is 40 V, which is less than the forward voltage Vf2.
It is assumed that resistors 143, 144, 243, 244 and 321 and voltage source 312 are selected according to the above settings.

  At time t0, the AC power supply AC is turned on to the LED lighting device 1, and the DC / DC converters 12 and 22 are activated. Strictly speaking, the DC / DC converters 12 and 22 are started after the AC power source AC is turned on. However, in the present disclosure, unless otherwise specified, the AC power source AC is turned on and each DC / DC converter is started. Are substantially simultaneous. After the time t0, the output voltages V1 and V2 increase according to the output capability of the DC / DC converters 12 and 22 until the respective target voltages are reached. At time t0, the transistor 320 is on. Therefore, the output voltages V1 and V2 increase according to the output capability of the DC / DC converters 12 and 22 until reaching the respective target voltages 120V and 40V.

  At time t1, the output voltage V2 reaches the target voltage, that is, the standby voltage Vs = 40V. Therefore, after time t1, the control circuit 24 performs constant voltage control and maintains the output voltage V2 at the standby voltage Vs = 40V. On the other hand, the output voltage V <b> 1 continues to increase according to the output capability of the DC / DC converter 12.

  Assuming that the target voltage for the output voltage V2 is set to the normal target voltage Vn (70V), the LED array 25 is lit before the LED array 15 at the virtual lighting time tv when the output voltage V2 reaches the forward voltage Vf2. Will start. Therefore, in the present embodiment, the standby circuit 30 causes the control circuit 24 to hold the output voltage V2 at the standby voltage Vs, and waits for the LED array 25 to be lit.

  At time t2, the output voltage V1 exceeds the standby release voltage Vr. As a result, the output of the comparator 310 is switched from the high level to the low level, and the transistor 320 transitions from the on state to the off state. Therefore, the target voltage for the output voltage V2 is switched from the standby voltage Vs (40V) to the normal target voltage Vn (70V), and the increase of the output voltage V2 according to the output capability of the DC / DC converter 22 is resumed.

  At time t3, the output voltages V1 and V2 reach the forward voltages Vf1 and Vf2, respectively, and the LED arrays 15 and 25 start to light simultaneously. After the time t3, the constant current control is executed in the lighting circuits 10 and 20, respectively.

  In this example, since the output capabilities of the DC / DC converters 12 and 22 are the same and the rising speeds of the output voltages V1 and V2 are the same, the difference between the forward voltage Vf1 and the standby release voltage Vr is the forward voltage Vf2. It is equal to the difference of the standby voltage Vs.

  On the other hand, the above operation is substantially the same when the output capability of the DC / DC converter 12 and the output capability of the DC / DC converter 22 are different, that is, when the rising speeds of the output voltage V1 and the output voltage V2 are different. . However, the relationship between the difference between the forward voltage Vf1 and the standby release voltage Vr and the difference between the forward voltage Vf2 and the standby voltage Vs according to the ratio of the rising speeds of the output voltages V1 and V2 is the same as in the case of FIG. 2A. Different.

  FIG. 2B shows an operation when the rising speeds of the output voltage V1 and the output voltage V2 are different. The definitions of the vertical and horizontal axes and times t0 to t3 and tv in FIG. 2B are the same as those in FIG. 2A. In this example, for example, it is assumed that the capacity of the smoothing capacitor 214 is smaller than the capacity of the smoothing capacitor 114, and the rising speed of the output voltage V2 is 1.25 times the rising speed of the output voltage V1.

  In this case, the forward voltages Vf1 and Vf2, the target voltage and standby release voltage Vr for the output voltage V1, and the normal target voltage Vn for the output voltage V2 are the same as those in the example of FIG. 2A. For example, the standby voltage Vs Is set to 37.5 V (= Vf2− (Vf1−Vr) × 1.25 = 50− (100−90) × 1.25). That is, when the ratio of the rising speed of the output voltage V2 to the rising speed of the output voltage V1 is α, the standby voltage Vs and the standby release voltage Vr are set so that (Vf1−Vr) × α = Vf2−Vs. Just do it. This generalization is also true when the rate of increase of the output voltage V2 is slower than the rate of increase of the output voltage V1.

  The difference between the forward voltage Vf1 and the standby release voltage Vr or the difference between the forward voltage Vf2 and the standby voltage Vs is preferably about 5V to 15V. With such a difference, the voltage difference from the cancellation of the standby state of the output voltage V2 to the arrival of the forward voltage Vf2 can be reduced, and the occurrence of the lighting time difference due to the variation in the output voltage V1 or V2 can be suppressed. Further, the LED caused by erroneous lighting of the LED array 25 due to variations in the forward voltage Vf2 (due to Vs ≧ Vf2) or due to variations in the forward voltage Vf1 (due to Vr> Vf1). The non-lighting of the array 25 can be prevented. Therefore, the lighting start timing coincides with high accuracy.

  As described above, the LED lighting device 1 of the present invention includes the lighting circuit 10, the lighting circuit 20 connected to the same power source as the lighting circuit 10, and the standby circuit 30. The lighting circuit 10 includes a DC / DC converter 12 that causes the output voltage V1 to reach the forward voltage Vf1 of the LED array 15 after a lapse of time t3 since the power is turned on, and the lighting circuit 20 has a time tv (tv <t3) from the power on. After that, the DC / DC converter 22 is capable of causing the output voltage V2 to reach the forward voltage Vf2 of the LED array 25. The standby circuit 30 maintains the output voltage V2 below the forward voltage Vf before the output voltage V1 reaches the forward voltage Vf1, so that the output voltage V2 reaches the forward voltage Vf2 after time t3 from the power-on. Configured as follows. Thereby, the timings at which the output voltages V1 and V2 reach the forward voltages Vf1 and Vf2 are equalized, and the time difference between the start of lighting of the LED arrays 15 and 25 can be eliminated. Therefore, in the LED lighting device including a plurality of lighting circuits that respectively light the plurality of LED arrays, the plurality of LED arrays can be lit simultaneously.

  Further, in the LED unit 2 of the LED lighting device 3, when the LED arrays 15 and 25 having different chromaticities are arranged for color mixing, the LED arrays 15 and 25 are lit at the same time. Color is obtained and good visual illumination is achieved.

  In particular, according to the present embodiment, the lighting circuit 10 includes a detection circuit 13 that detects the output voltage V1, and the lighting circuit 20 includes a detection circuit 23 that detects the output voltage V2 and a DC so that the output voltage V2 matches the target voltage. A control circuit 24 capable of constant voltage control of the DC / DC converter 22 is included. The standby circuit 30 maintains the target voltage of the output voltage V2 at the standby voltage Vs less than the forward voltage Vf2 after power-on, and when the output voltage V1 exceeds the standby release voltage Vr less than the forward voltage Vf1, the output voltage V2 The standby voltage Vs and standby release voltage Vr are set so that the target voltage is switched to the normal target voltage Vn that is equal to or higher than the forward voltage Vf2, and the output voltage V2 reaches the forward voltage Vf2 after time t3 from the power-on. Is done. Thus, since the output voltage V2 is maintained at the standby voltage Vs less than the forward voltage Vf2 until the output voltage V1 exceeds the standby release voltage Vr, the output voltage Vs and the standby release voltage Vr are set according to the setting of the output voltage Vs and the standby release voltage Vr. V2 can reach the forward voltage Vf2 at a desired time t3. Therefore, the timing at which the output voltages V1 and V2 reach the forward voltages Vf1 and Vf2, respectively, that is, the lighting start timings of the LED arrays 15 and 25 can be matched with high accuracy.

<Second Embodiment>
In the first embodiment, the target voltage increase switching timing in the lighting circuit 20 is based on the output voltage V1, but in this embodiment, the target voltage increase switching timing in the lighting circuit 20 is a predetermined standby time. The structure based on is shown.

  In FIG. 3, the circuit diagram of the LED lighting device 1 of this embodiment and the LED lighting apparatus 3 using the same is shown. The configuration of the standby circuit 30 is different between the present embodiment and the first embodiment. In this embodiment, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the detailed description is abbreviate | omitted.

  The standby circuit 30 includes a transistor 320, a resistor 321, a determination unit 330, and a timer circuit 335. The standby circuit 30 receives the control voltage Vcc2 and operates using the secondary side ground G2s as a reference potential. The determination voltage from the detection circuit 23 (the voltage of the resistor 232) is input to the determination unit 330, as in the operational amplifier 241. The determination unit 330 determines whether or not the output voltage V2 has reached the standby voltage Vs based on the detected voltage. When the output voltage V2 has not reached the standby voltage Vs, the determination unit 330 does not start the timer circuit 335, and the transistor 320 is maintained in the off state. When the output voltage V2 reaches the standby voltage Vs, the determination unit 330 activates the timer circuit 335, and after the timer 335 counts a predetermined standby time Ts, the transistor 320 is turned on.

  An example of the operation of the LED lighting device 1 of the present embodiment will be described with reference to FIGS. 4A and 4B. 4A and 4B, the upper stage shows the output voltage V1 (broken line) and the output voltage V2 (solid line), the lower stage shows the operating state of the transistor 320, and the horizontal axis is time. In the example of FIG. 4A, the rising speed of the output voltage V1 and the rising speed of the output voltage V2 are the same. In the example of FIG. 4B, the rising speed of the output voltage V2 is higher than the rising speed of the output voltage V1. Although both figures are shown for clarity of illustration, the operation is the same in either case.

The setting of each voltage in the present embodiment is as follows (however, the embodiment is not limited to these numerical values).
The forward voltage Vf1 is 100V.
The forward voltage Vf2 is 55V.
The target voltage for the output voltage V1 is a voltage (for example, 120V) higher than the forward voltage Vf1.
The normal target voltage Vn with respect to the output voltage V2 is a voltage (for example, 70 V) higher than the forward voltage Vf2.
The standby voltage Vs for the output voltage V2 is 45 V, which is less than the forward voltage Vf2.
It is assumed that resistors 143, 144, 243, 244 and 321 are selected according to the above settings.

  At time t0, the AC power supply AC is turned on to the LED lighting device 1, and the DC / DC converters 12 and 22 are activated. After the time t0, the output voltages V1 and V2 increase according to the output capability of the DC / DC converters 12 and 22 until the respective target voltages are reached. At time t0, the transistor 320 is on. Therefore, the output voltages Vc1 and Vc2 rise according to the output capability of the DC / DC converters 12 and 22 until reaching the respective target voltages 120V and 45V.

  At time t1, the output voltage V2 reaches the target voltage, that is, the standby voltage Vs = 45V. Therefore, after time t1, the control circuit 24 performs constant voltage control and maintains the output voltage V2 at the standby voltage Vs = 45V. At time t1, the determination unit 330 starts the timer 335. On the other hand, the output voltage V <b> 1 continues to increase according to the output capability of the DC / DC converter 12.

  Assuming that the target voltage for the output voltage V2 is set to the normal target voltage Vn (70V), the LED array 25 is lit before the LED array 15 at the virtual lighting time tv when the output voltage V2 reaches the forward voltage Vf2. Will start. In this case, a time difference Td (= t3−tv) between the lighting start of the LED array 15 and the lighting start of the LED array 25 is set as the standby time Ts. The time difference Td is acquired in advance by actual measurement or the like. Thereby, the standby circuit 30 holds the output voltage V2 at the standby voltage Vs over the standby time Ts, and delays the lighting of the LED array 25.

  At time t2, the timer circuit 335 finishes counting the standby time Ts, whereby the transistor 320 transitions from the on state to the off state. Therefore, the target voltage for the output voltage V2 is switched from the standby voltage Vs (45V) to the normal target voltage Vn (70V), and the increase of the output voltage V2 according to the output capability of the DC / DC converter 22 is resumed.

  At time t3, the output voltages V1 and V2 reach the forward voltages Vf1 and Vf2, respectively, and the LED arrays 15 and 25 start to light simultaneously. After the time t3, the constant current control is executed in the lighting circuits 10 and 20, respectively.

  As described above, according to the present embodiment, the lighting circuit 20 includes the detection circuit 23 that detects the output voltage V2, and the control that can control the DC / DC converter 22 so that the output voltage V2 matches the target voltage. Circuit 24 is included. Then, the standby circuit 30 sets the target voltage of the output voltage V2 in the forward direction after power-on as the standby voltage Vs is a predetermined voltage less than the forward voltage Vf2 and the standby time Ts is a value Td obtained by subtracting the time tv from the time t3. The standby voltage Vs lower than the voltage Vf2 is maintained, and the target voltage is switched to the normal target voltage Vn equal to or higher than the forward voltage Vf2 after the standby time Ts elapses after the output voltage V2 reaches the standby voltage Vs. Is done. Thus, the time difference Td between the start of lighting of the LED array 15 and the start of lighting of the LED array 25 is acquired in advance, and the output voltage V2 is maintained below the forward voltage Vf2 for the standby time Ts corresponding to this time difference Td. As a result, the output voltage V2 can reach the forward voltage Vf2 at a desired time t3. Therefore, the timing at which the output voltages V1 and V2 reach the forward voltages Vf1 and Vf2, respectively, that is, the lighting start timings of the LED arrays 15 and 25 can be matched with a simple configuration.

<Third Embodiment>
In the second embodiment, the configuration in which the standby state of the target voltage of the output voltage V1 is canceled based on the standby time Ts has been described. However, in this embodiment, the activation of the DC / DC converter 22 occurs at the standby time Ts. The structure delayed based on this is shown.

  In FIG. 5, the circuit diagram of the LED lighting device 1 of this embodiment and the LED lighting apparatus 3 using the same is shown. The configuration of the standby circuit 30 is different between the present embodiment and the second embodiment. In this embodiment, the same code | symbol is attached | subjected to the structure similar to 2nd Embodiment, and the detailed description is abbreviate | omitted.

  The standby circuit 30 includes a timer circuit 335 and a power supply detection unit 340, and operates using the primary side ground G1s as a reference potential. The power supply detection unit 340 detects the output voltage of the diode bridge 211, for example, and detects the input of the AC power supply AC. The power detection unit 340 starts the timer 335 when detecting power-on. When the timer circuit 335 is activated, the timer circuit 335 counts the waiting time Ts similar to that of the second embodiment. The timer circuit 335 disables the operation of the drive unit 251 before the standby time Ts elapses, and enables the operation of the drive unit 251 after the standby time Ts elapses. That is, the DC / DC converter 22 is in a stopped state from when the power is turned on until the standby time Ts elapses, and is activated after the standby time Ts elapses.

  An example of operation | movement of the LED lighting device 1 of this embodiment is demonstrated to FIG. 6A and 6B. 6A and 6B, the upper stage shows the output voltage V1 (broken line) and the output voltage V2 (solid line), the lower stage shows the operating state of the DC / DC converter 22, and the horizontal axis is time. In the example of FIG. 6A, the rising speed of the output voltage V1 is the same as the rising speed of the output voltage V2. In the example of FIG. 6B, the rising speed of the output voltage V2 is higher than the rising speed of the output voltage V1. Although both figures are shown for clarity of illustration, the operation is the same in either case.

The setting of each voltage in the present embodiment is as follows (however, the embodiment is not limited to these numerical values).
The forward voltage Vf1 is 100V.
The forward voltage Vf2 is 55V.
The target voltage for the output voltage V1 is a voltage (for example, 120V) higher than the forward voltage Vf1.
The normal target voltage Vn with respect to the output voltage V2 is a voltage (for example, 70 V) higher than the forward voltage Vf2.

  At time t0, the AC power source AC is turned on to the LED lighting device 1 and the DC / DC converter 12 is activated. After time t0, the output voltage V1 increases according to the output capability of the DC / DC converter 12. At time t0, the DC / DC converter 22 is not activated.

  If the DC / DC converters 12 and 22 are activated simultaneously, the LED array 25 starts lighting before the LED array 15 at the virtual lighting time tv when the output voltage V2 (V2 ′) reaches the forward voltage Vf2. Will end up. In this case, a time difference Td (= t3−tv) between the lighting start of the LED array 15 and the lighting start of the LED array 25 is set as the standby time Ts. The time difference Td is acquired in advance by actual measurement or the like.

  At time t4, the DC / DC converter 22 is activated, and the output voltage V2 starts to increase according to the output capability of the DC / DC converter 22. On the other hand, the output voltage V <b> 1 continues to increase according to the output capability of the DC / DC converter 12. As described above, in this embodiment, the standby circuit 30 activates the DC / DC converter 22 after the standby time Ts from power-on to delay the lighting of the LED array 25.

  At time t3, the output voltages V1 and V2 reach the forward voltages Vf1 and Vf2, respectively, and the LED arrays 15 and 25 start to light simultaneously. After the time t3, the constant current control is executed in the lighting circuits 10 and 20, respectively.

  As described above, in the present embodiment, the standby circuit 30 starts the DC / DC converter 22 after the standby time Ts has elapsed since the power was turned on, with the value Td obtained by subtracting the time tv from the time t3 as the standby time Ts. Composed. Thus, the time difference Td between the start of lighting of the LED array 15 and the start of lighting of the LED array 25 is acquired in advance, and the activation of the DC / DC converter 22 is delayed by the standby time Ts corresponding to this time difference Td. As a result, the output voltage V2 can reach the forward voltage Vf2 at a desired time t3. Therefore, the timing at which the output voltages V1 and V2 reach the forward voltages Vf1 and Vf2, respectively, that is, the lighting start timings of the LED arrays 15 and 25 can be matched with a simple configuration.

<Fourth Embodiment>
In the first to third embodiments, the configuration in which the operation setting (standby voltage Vs, standby release voltage Vr or standby time Ts) in the standby circuit 30 is fixed has been described. However, in the present embodiment, the operation setting is performed. Shows a configuration that can be updated or corrected every time the lamp is turned on. In the present embodiment, the capacitances of the capacitors 114 and 214 that affect the increase rate of the output voltage can be reduced along with the usage time due to deterioration over time, and the capacitances thereof vary depending on individual variations. This is to compensate for a deviation in lighting timing caused by a change or variation in. In addition, the present embodiment is also effective for compensating for a deviation in lighting timing when the forward voltages Vf1 and Vf2 have a change with time or individual variation in the LED arrays 15 and 25.

  FIG. 7 shows a compensation circuit 40 of this embodiment and its peripheral circuit applicable to the LED lighting device 1 of the first embodiment. FIG. 8 shows a compensation circuit 40 of this embodiment and its peripheral circuits applicable to the LED lighting device 1 of the second and third embodiments. In this embodiment, the same code | symbol is attached | subjected to the structure similar to the 1st-3rd embodiment, and the detailed description is abbreviate | omitted.

  7 and 8, the compensation circuit 40 includes lighting detection units 41 and 42, a time difference calculation unit 43, and a setting update unit 44. Compensation circuit 40 is composed of a microcomputer or the like, and may have a CPU including the above-described units and a memory (not shown) that can exchange data with the CPU. The compensation circuit 40 updates various operation settings in the standby circuit 30 so as to reduce the time difference between the start of lighting of the LED array 15 and the start of lighting of the LED array 25.

  The lighting detection unit 41 is connected to the output terminal of the operational amplifier 142 for constant current control, and detects the start of lighting of the LED array 15 based on the state of constant current control in the control circuit 14. The lighting detection unit 42 is connected to the output terminal of the constant current control operational amplifier 242 and detects the lighting start of the LED array 25 based on the state of constant current control in the control circuit 24. For example, before and after the start of lighting, since the error between the detected current (= zero) and the target current changes from a large state to a small error between the detected current and the target current, the output states of the operational amplifiers 142 and 242 are changed. It changes abruptly. The lighting detection units 41 and 42 can specify the lighting start time of the LED arrays 15 and 25 by detecting such a steep change in the output state of the operational amplifiers 142 and 242, respectively.

The time difference calculation unit 43 calculates a time difference Δt (= t ₂₀ −t ₁₀ ) between the lighting time t ₁₀ specified by the lighting detection unit 41 and the lighting time t ₂₀ specified by the lighting detection unit 42.

(1) Configuration of FIG. 7 (refer to the first embodiment)
The setting updating unit 44 adjusts the voltage (hereinafter referred to as “threshold”) of the negative input terminal of the comparator 310 based on the time difference Δt detected by the time difference calculation unit 43.

Specifically, when t ₂₀ > t ₁₀ , the LED array 25 has started lighting later than the LED array 15. Therefore, the setting update unit 44 decreases the standby release voltage Vr by lowering the threshold value of the comparator 310. Thereby, the time t2 in FIG. 2A and FIG. 2B is advanced at the next lighting time. Conversely, when t ₂₀ <t ₁₀ , the LED array 25 has started lighting earlier than the LED array 15. Therefore, the setting update unit 44 increases the standby release voltage Vr by increasing the threshold value of the comparator 310. Thereby, the time t2 in FIG. 2A and FIG. 2B becomes late at the time of next lighting. Thereby, at the next lighting, the timing when the output voltage V1 reaches the forward voltage Vf1 and the timing when the output voltage V2 reaches the forward voltage Vf2 coincide.

When the functions of the comparator 310, the transistor 320, and the resistor 321 are replaced by a microcomputer, the setting update unit 44 can also adjust the standby voltage Vs via the microcomputer. Specifically, when t ₂₀ > t ₁₀ , the LED array 25 starts lighting later than the LED array 15, so the setting update unit 44 causes the microcomputer to increase the standby voltage Vs. This shortens the time t2 to t3 of the output voltage V2 in FIGS. 2A and 2B at the next lighting. Conversely, if t ₂₀ <t ₁₀ , the LED array 25 has started lighting earlier than the LED array 15, so the setting update unit 44 causes the microcomputer to reduce the standby voltage Vs. As a result, the time t2 to t3 of the output voltage V2 in FIGS. 2A and 2B is extended at the next lighting. Thereby, at the next lighting, the timing when the output voltage V1 reaches the forward voltage Vf1 and the timing when the output voltage V2 reaches the forward voltage Vf2 coincide.

(2) Configuration of FIG. 8 (refer to the second and third embodiments)
The setting update unit 44 adjusts the standby time Ts in the timer circuit 335 based on the time difference Δt detected by the time difference calculation unit 43. As indicated by the solid line, when the timer circuit 335 is connected to the determination unit 330, the timer circuit 335 is connected to the transistor 320 to determine its off timing (second embodiment). As indicated by a broken line, when the timer circuit 335 is connected to the power supply detection unit 340, the timer circuit 335 is connected to the drive unit 251 to determine the start timing of the DC / DC converter 22 (third Embodiment).

Specifically, when t ₂₀ > t ₁₀ , the LED array 25 starts to be turned on later than the LED array 15, so the setting update unit 44 decreases the waiting time Ts. Thereby, at the next lighting, time t2 in FIGS. 4A and 4B or time t4 in FIGS. 6A and 6B is advanced. Conversely, when t ₂₀ <t ₁₀ , the LED array 25 starts lighting earlier than the LED array 15, so the setting update unit 44 increases the waiting time Ts. As a result, at the next lighting, the time t2 in FIGS. 4A and 4B or the time t4 in FIGS. 6A and 6B is delayed. Thereby, at the next lighting, the timing when the output voltage V1 reaches the forward voltage Vf1 and the timing when the output voltage V2 reaches the forward voltage Vf2 coincide.

  When the determination unit 330 is connected to the timer circuit 335 and the functions of the transistor 320, the timer circuit 335, and the like are replaced by a microcomputer, the setting update unit 44 sets the standby voltage Vs via the microcomputer. It can also be adjusted. The adjustment operation of the standby voltage Vs in this case is the same as that described above with reference to FIG. In this case, the waiting time Ts may be a fixed value or a variable value.

As described above, the LED lighting device 1 of the present embodiment further includes the compensation circuit 40. The compensation circuit 40 includes a lighting detection unit 41 that detects the lighting start of the LED array 15, a lighting detection unit 42 that detects the lighting start of the LED array 25, and a lighting start time t ₁₀ of the LED array 15 detected by the lighting detection unit 41. lighting standby release voltage Vr as the time difference calculating portion 42 calculates a difference Delta] t, and the difference Delta] t decreases the lighting start mode t ₂₀ of the LED array 25, which is detected by the detection unit 42, the standby voltage Vs or waiting time A setting update unit 44 that updates the setting of Ts is included. As described above, the standby release voltage Vr, the standby voltage Vs, or the standby time Ts is optimized for each lighting operation, and the time difference between the start of lighting of the LED arrays 15 and 25 is always minimized. Therefore, according to the above configuration, the change in the rising speed of the output voltages V1 and V2 and the individual variation, and the deviation of the lighting start timing due to the temporal change and the individual variation of the forward voltages Vf1 and Vf2 are appropriately compensated, and the LED array. It becomes possible to match the lighting start timings of 15 and 25 with higher accuracy.

  Further, when the present embodiment is applied to the update of the standby time Ts, the initial value of the standby time Ts is set to an arbitrary value such as zero, and the standby time Ts is acquired by the initial lighting (test lighting) of the LED lighting device 3. It is possible to automatically set the waiting time Ts for the second and subsequent lighting (practical lighting). Thereby, the process which acquires the initial value of waiting time Ts by measurement becomes unnecessary, and the introduction ease of LED lighting device 1 and LED lighting device 3 increases.

<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) Change in the number of systems In each of the above embodiments, the configuration of two-system output (that is, two sets of lighting circuits and LED arrays) is shown, but a configuration having three or more systems of output is also possible. In this case, the lighting circuit with the slowest time for the output voltage to reach the forward drop voltage of the LED array is the lighting circuit 10 (first lighting circuit), and each of the other lighting circuits is the lighting circuit 20 (second lighting). Each embodiment can be implemented as a circuit).

(2) Modification of magnitude relation of forward voltage In each of the above embodiments, the virtual lighting time tv of the LED array with the lower forward voltage occurs before the lighting time of the LED array with the higher forward voltage. It was explained on the assumption that On the other hand, each of the above embodiments can also be applied to a configuration in which the virtual lighting time tv of the LED array with the lower forward voltage occurs after the lighting time of the LED array with the higher forward voltage. In this case, standby voltage Vs> standby release voltage Vr can be satisfied. Moreover, although each said embodiment showed the case where the forward voltage of several LED arrays was mutually different, each said embodiment has the same forward voltage of several LED array, and several lighting circuits are the same. The present invention is also applicable when the output voltage rise rate is different. In any case, the lighting circuit whose output voltage reaches the forward voltage drop of the LED array in the later time is used as the lighting circuit 10 (first lighting circuit), and the other lighting circuit is used as the lighting circuit 20 (second lighting circuit). Each embodiment can be implemented as a lighting circuit).

(3) Modifications related to application In each of the above embodiments, a configuration in which color mixing is performed using a plurality of LED arrays having different chromaticities has been described. However, each of the above embodiments is related to the difference in chromaticity of a plurality of LED arrays. In other words, the present invention is applicable when it is necessary to simultaneously light a plurality of LED arrays by a plurality of lighting circuits.

DESCRIPTION OF SYMBOLS 1 LED lighting device 2 LED unit 3 LED illumination device 10, 20 Lighting circuit 12, 22 DC / DC converter 13, 23 Detection circuit 14, 24 Control circuit 15, 25 LED array 30 Standby circuit 40 Compensation circuit 41, 42 Lighting detection part 43 Time difference calculation unit 44 Setting update unit

Claims (9)

An LED lighting device,
A first lighting circuit having a first DC / DC converter that causes the first output voltage to reach the first forward voltage of the first LED array after a first time has elapsed since power-on;
The second output voltage is connected to the same power source as the first lighting circuit, and the second output voltage is changed to the second forward voltage of the second LED array after a second time shorter than the first time since the power is turned on. A second lighting circuit having a second DC / DC converter capable of reaching;
Before the first output voltage reaches the first forward voltage, the first output voltage reaches the second forward voltage so that the second output voltage reaches the second forward voltage after the first time from power-on. And a standby circuit for maintaining the output voltage of 2 below the second forward voltage. The first lighting circuit further includes a first detection circuit for detecting the first output voltage;
The second lighting circuit can control the constant voltage of the second DC / DC converter so that the second output circuit detects the second output voltage and the second output voltage matches the target voltage. Further including a control circuit,
When the standby circuit maintains the target voltage at a standby voltage less than the second forward voltage after power-on, and the first output voltage exceeds a standby release voltage less than the first forward voltage The target voltage is configured to be switched to a voltage equal to or higher than the second forward voltage, and the second output voltage reaches the second forward voltage after the first time from power-on. The LED lighting device according to claim 1, wherein a standby voltage and the standby release voltage are set.   The LED lighting device according to claim 2, wherein a difference between the first forward voltage and the standby release voltage or a difference between the second forward voltage and the standby voltage is 5 V or more and 15 V or less. The second lighting circuit includes a detection circuit for detecting the second output voltage, and a control circuit capable of performing constant voltage control on the second DC / DC converter so that the second output voltage matches a target voltage. Further including
A value obtained by subtracting the second time from the first time is set as a standby time.
The standby circuit maintains the target voltage at a standby voltage lower than the second forward voltage after power-on, and after the standby time elapses after the second output voltage reaches the standby voltage. The LED lighting device according to claim 1, wherein the LED lighting device is configured to switch the target voltage to a voltage equal to or higher than the second forward voltage. A value obtained by subtracting the second time from the first time is set as a standby time.
2. The LED lighting device according to claim 1, wherein the standby circuit is configured to start the second DC / DC converter after the standby time has elapsed since power-on. 3.   The first lighting detection unit that detects the lighting start of the first LED array, the second lighting detection unit that detects the lighting start of the second LED array, and the first lighting detection unit detected by the first lighting detection unit A time difference calculation unit for calculating a difference between the start of lighting of the first LED array and the start of lighting of the second LED array detected by the second lighting detection unit; and the difference so that the difference decreases. The LED lighting device according to claim 2, further comprising a compensation circuit including a setting update unit that updates a setting of the standby voltage or the standby release voltage.   The first lighting detection unit that detects the lighting start of the first LED array, the second lighting detection unit that detects the lighting start of the second LED array, and the first lighting detection unit detected by the first lighting detection unit A time difference calculation unit for calculating a difference between the start of lighting of the first LED array and the start of lighting of the second LED array detected by the second lighting detection unit; and the difference so that the difference decreases. The LED lighting device according to claim 4, further comprising a compensation circuit including a setting update unit that updates the setting of the standby time or the standby voltage.   The first lighting detection unit that detects the lighting start of the first LED array, the second lighting detection unit that detects the lighting start of the second LED array, and the first lighting detection unit detected by the first lighting detection unit A time difference calculation unit for calculating a difference between the start of lighting of the first LED array and the start of lighting of the second LED array detected by the second lighting detection unit; and the difference so that the difference decreases. The LED lighting device according to claim 5, further comprising a compensation circuit including a setting update unit that updates the setting of the standby time. An LED lighting device according to any one of claims 1 to 8 and an LED unit provided with the first and second LED arrays, wherein the chromaticity of the first LED array and the second LED array are provided. LED illuminating apparatus in which the chromaticity of the LED array is different and the first LED array and the second LED array are arranged for color mixing.

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