JP2017212197A - LED lighting device and LED unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device for multiple lights which does not output a high voltage even when a load connection end becomes no load. It also provides a highly efficient LED unit with low power consumption. In this LED lighting device, since voltage limiting diode elements D1 and D2 limit the potential on the output side, an excessive voltage is not output to the load connection terminals Pa and Pb. Further, since the operations of the voltage limiting diode elements D1 and D2 do not affect the dimming operation, both deep dimming and high voltage countermeasures can be achieved at the same time. Further, in the LED unit 70, since the transistor element TR provided for each light emitting diode row 73 predominantly determines the current value, the current value is biased even if the forward voltage of the light emitting diode row 73 varies. Does not occur. Therefore, it is possible to obtain an energy-saving LED unit that functions with a low-loss emitter resistor Rb and consumes less power. [Selection diagram] Fig. 1

Description

  The present invention relates to a multi-lamp LED lighting device and a low-loss LED unit for lighting a plurality of LED units with a constant current using a LED unit having a plurality of light emitting diodes (LEDs) connected thereto as a load.

  In recent years, energy saving momentum has increased, and LED lighting using light-emitting diode elements that have high luminous efficiency, long life, and low power consumption has become widespread. In addition, LED lighting devices for multiple lamps that light a plurality of LED units each having a plurality of light emitting diode elements connected thereto have been commercialized. Here, the forward voltage of the light-emitting diode element has variations and also changes depending on the temperature. Therefore, there is a large variation in the forward voltage of the LED unit composed of a plurality of light emitting diode elements. For this reason, it is preferable that the LED unit is driven at a constant current in terms of stability of illuminance and extending the life of the light emitting diode element. In this regard, the LC resonance type LED lighting device can drive the connected LED units with a constant current regardless of variations or fluctuations in the forward voltage of the LED units. Therefore, in the LED lighting device for LC resonance type multi-lamps, even when plural types of LED units having different numbers and types of light emitting diode elements are mixed, these LED units can be stably lit with a constant current. .

  However, the general constant current lighting type multi-lamp LED lighting device has many high-frequency oscillation circuits, high-frequency output circuits, and LED lighting circuits including current detection / current control means simply connected in parallel by the number of LED units. . Such LED lighting devices for multiple lamps have a number of parts, a complicated circuit configuration, and a high cost.

  In order to solve this problem, the inventors of the present application have made the invention described in [Patent Document 1] below. FIG. 14 shows a circuit diagram of the lighting device 1 described in [Patent Document 1]. The lighting device 1 described in [Patent Document 1] includes a DC power supply unit 20 that rectifies the power of the external power supply 10 by the rectification unit 22 and outputs the rectified power to the positive electrode B (+) and the negative electrode B (−), and the switching element Q1. , A high frequency output unit 50 (high frequency output circuit) that converts a direct current supplied from the positive electrode B (+) and the negative electrode B (−) into a predetermined high frequency alternating current and outputs it from the high frequency output point A. An LC resonance circuit unit 30 ′ including a high-frequency oscillation control unit 40 (high-frequency oscillation circuit) that alternately controls switching elements Q1 and Q2 of the high-frequency output unit 50, a resonance inductor element Lf, and a resonance capacitor element Cf. And load connection ends Pa and Pb from which AC power from the LC resonance circuit unit 30 ′ is output. An LED unit 70 ′ having a plurality of light emitting diode elements 72 is connected to the load connection ends Pa and Pb. As described above, the lighting device 1 described in [Patent Document 1] drives a plurality of LED units 70 ′ with a single high-frequency output unit 50 and a high-frequency oscillation control unit 40 at a constant current. As a result, the circuit configuration can be simplified and the component cost can be reduced.

  In addition, in the multi-LED lighting device, the user may intentionally remove the LED unit 70 'to perform a thinning operation. In this case, a high voltage is output between the unloaded load connection ends Pa and Pb to which the LED unit 70 'is not connected. With respect to this problem, in the lighting device 1 described in [Patent Document 1], when the load connection terminals Pa and Pb are unloaded, the connection of the LC resonance circuit unit 30 'is opened and the load connection terminals Pa and Pb are opened. The protective circuit unit 60 'prevents the high voltage output.

Japanese Patent No. 5319606

  However, the protection circuit section 60 'described in [Patent Document 1] requires a no-load signal that continues for a certain period of time in order to prevent malfunction. For this reason, a high voltage exceeding 10 kV is generated in the load connection terminals Pa and Pb and the circuit before the protection circuit 60 ′ operates, which may cause a safety problem and may damage the circuit element. Further improvements are desired.

  In addition, one of the major features of LED lighting is that dimming is possible. In recent years, there is also a demand for deep (dark) dimming with a dimming rate of 94%. However, the LC resonance type lighting device 1 cannot greatly deviate the operating frequency of the LC resonance circuit unit 30 from the resonance point. For this reason, there is a limit to dimming due to a change in operating frequency, and it is not possible to deal with dimming with a large dimming rate. Moreover, intermittent lighting of an LED unit is mentioned as one of the comparatively low-cost light control methods. This is because the LED unit blinks at high speed by intermittently outputting a high frequency signal for switching the high frequency output unit 50, and dimming (dimming) is performed by changing the ratio of the extinction period (off period). Is. However, in the lighting device 1 described in [Patent Document 1], the protection circuit unit 60 ′ cannot cope with this intermittent operation, and it is impossible to achieve both deep dimming and high voltage countermeasures during no load.

  Further, in the LED unit to which a large number of light emitting diode elements are connected, for example, as shown in the LED unit 7 in FIG. 15, a plurality of light emitting diode rows 73 in which a plurality of light emitting diode elements 72 are connected in series are connected in parallel. Is common. However, as described above, there is a variation in the forward voltage of each light emitting diode element 72, and thus there is also a variation in the forward voltage in the light emitting diode row 73 in which these are connected in series. For this reason, in the LED unit 7 in which the light emitting diode rows 73 are simply connected in parallel, even if constant current driving is performed on the units, the current value varies for each light emitting diode row 73 and the advantages of constant current driving cannot be fully utilized.

  In order to solve this problem, the light emitting diode elements 72 are selected for each forward voltage, and in addition to suppressing the fluctuation of the forward voltage of the light emitting diode array 73 itself, the resistance value of the current limiting resistor R is increased. Measures are taken to reduce the effects of forward voltage. However, when the resistance value of the current limiting resistor R is increased, there is a problem that the loss increases and the power consumption of the LED unit 7 as a whole increases.

  This invention is made | formed in view of the said situation, and it aims at providing the LED lighting device for multiple lamps which a high voltage does not output even when a load connection end becomes no load. Another object of the present invention is to provide a highly efficient LED unit with low power consumption.

The present invention
(1) A DC power supply unit 20 that supplies a DC current, a first switching element Q1 and a second switching element Q2 connected in series between outputs of the DC power supply unit 20, and the first switching element Q1 A plurality of high-frequency oscillation control units 40 that alternately turn on and off the second switching element Q2 and a connection point (high-frequency output point A) between the first switching element Q1 and the second switching element Q2 are connected in parallel. The LC resonance circuit unit 30 and the output rectification unit DB connected to the respective output points of the LC resonance circuit unit 30 to rectify the AC output from the LC resonance circuit unit 30 and output the rectified output to the load connection terminals Pa and Pb. Have
The LC resonance circuit unit 30 includes a resonance inductor element Lf having one end connected to a connection point A between the first switching element Q1 and the second switching element Q2, the other end of the resonance inductor element Lf, and the A multi-lamp LED lighting device including a resonance capacitor element Cf connected between the negative electrode B (−) of the DC power supply unit 20 and an LED unit 70 connected to the load connection ends Pa and Pb.
The LC resonance circuit unit 30 has a cathode connected to the positive electrode B (+) of the DC power supply unit 20 and an anode connected between the resonance inductor element Lf and the resonance capacitor element Cf. Any one of the element D1 and the second voltage limiting diode element D2 whose cathode is connected between the resonance inductor element Lf and the resonance capacitor element Cf and whose anode is connected to the negative electrode B (−) of the DC power supply unit 20 By providing the LED lighting devices 80 and 80a having at least one of these, the above-described problems are solved.
(2) The LED lighting devices 80 and 80a according to the above (1) are provided by further including an intermittent oscillation modulation unit 42 that intermittently operates the high-frequency oscillation control unit 40 at a predetermined time interval. To solve.
(3) The LED lighting device according to (1) or (2), wherein the LC resonance circuit unit 30 includes both the first voltage limiting diode element D1 and the second voltage limiting diode element D2. By providing 80 and 80a, the above-mentioned problem is solved.
(4) The protective circuit 60 is provided between the output rectifier DB and the load connection terminals Pa and Pb,
The protection circuit 60 includes a no-load detection unit 62 that generates a no-load signal when the load connection terminals Pa and Pb are unloaded, and a protective switching element that short-circuits the load connection terminals Pa and Pb by the no-load signal. (SCR) and a holding wiring 66 that flows a holding current through the protection switching element (SCR) and maintains the short-circuited state of the protection switching element (SCR) during an OFF period during intermittent operation. The above problem is solved by providing the LED lighting device 80a according to any one of (1) to (3).
(5) The direct current blocking capacitor Cdc is connected between the resonance inductor element Lf and the resonance capacitor element Cf, or between the resonance capacitor element Cf and the output rectifier DB (1) By providing the LED lighting devices 80 and 80a according to any one of (4) to (4), the above-described problem is solved.
(6) The LED lighting device 80 or 80a according to any one of (1) to (5), wherein the DC power supply unit 20 rectifies the commercial power supply by a full-wave rectifier circuit or a voltage doubler rectifier circuit. By providing the above, the above-described problems are solved.
(7) The LED lighting devices 80 and 80a according to any one of (1) to (6) above, wherein the DC power supply unit 20 includes a non-insulated active filter circuit 24 or an insulating active filter circuit. By providing, the above-mentioned problems are solved.
(8) In an LED unit in which a plurality of light emitting diode rows 73 in which a plurality of light emitting diode elements 72 are connected in series are connected in parallel,
Each light emitting diode row 73 includes a transistor element TR,
The light emitting diode row 73, the collector and emitter of the transistor element TR, and the emitter resistor Rb are connected in series, and all the bases of the transistor element TR are connected, so that all the transistor elements TR have the same potential. The above problem is solved by providing an LED unit 70 that is characterized in that the base current from the current source flows down.
(9) The load connection ends Pa and Pb have LED units 70 in which a plurality of light emitting diode rows 73 in which a plurality of light emitting diode elements 72 are connected in series are connected in parallel.
The LED unit 70 includes:
Each light emitting diode row 73 includes a transistor element TR,
The light emitting diode row 73, the collector and emitter of the transistor element TR, and the emitter resistor Rb are connected in series, and all the bases of the transistor element TR are connected, so that all the transistor elements TR have the same potential. The above problem is solved by providing the LED lighting devices 80 and 80a according to any one of the above (1) to (7), characterized in that the base current from the above is caused to flow down.
(10) The LED lighting devices 80 and 80a according to any one of the above (1) to (7) and (9) are provided, wherein the circuit board is configured as an integrated type or divided at an arbitrary circuit point. This solves the above problem.

The LED lighting device according to the present invention can limit the output voltage at no load by connecting a voltage limiting diode element to the LC resonance circuit.
The operation of the voltage limiting diode element does not affect the dimming operation by the intermittent signal. For this reason, by applying the present invention to an LED lighting device having a dimming function, it is possible to achieve both deep dimming by intermittent operation and high voltage countermeasures during no load.
In addition, the LED unit according to the present invention dominantly determines the current value that the transistor element provided for each light emitting diode row flows down to the light emitting diode row. For this reason, even if there is a variation in the forward voltage of the light emitting diode array, there is no large deviation in the value of the flowing current, and the emitter resistor functions with a low loss. Thereby, an energy-saving LED unit with low power consumption can be obtained.
By combining the LED lighting device and the LED unit according to the present invention, it is possible to obtain an LED lighting device that is excellent in safety and energy saving and has the maximum merit of constant current driving.

It is a circuit diagram of the LED lighting device which concerns on this invention. It is a circuit diagram of the LED lighting device which concerns on this invention provided with the active filter circuit. It is a circuit diagram of the LED lighting device which concerns on this invention provided with the light control function. It is a circuit diagram of the LED lighting device which concerns on this invention provided with the light control function and the active filter circuit. It is a circuit diagram of LC resonance circuit part of the LED lighting device concerning the present invention. It is a graph explaining an oscillation frequency and a resonance voltage. It is a graph which shows the effect of the voltage limiting diode element of the LED lighting device which concerns on this invention. It is a graph which shows the relationship between a light emitting diode element and its electric current value. It is a graph which shows the effect of the voltage limiting diode element of the LED lighting device which concerns on this invention. It is a circuit diagram of the LED lighting device of the 2nd form which concerns on this invention provided with the protection circuit. It is a circuit diagram of the LED lighting device of the 2nd form which concerns on this invention provided with the light control function and the protection circuit. It is a circuit diagram of the LED unit which concerns on this invention. It is a circuit diagram of the LED lighting device which concerns on this invention which showed the example of board | substrate division | segmentation. It is a circuit diagram of the conventional LED lighting device. It is a circuit diagram of the conventional LED unit.

  Embodiments of an LED lighting device according to the present invention will be described with reference to the drawings. Here, four LED lighting circuits 80 and 80a that have four LED lighting circuits and can connect four LED units as loads will be described as an example, but the number of LED lighting circuits is particularly limited. There may be any number within the allowable range of the circuit. Moreover, although the example which connected the LED unit 70 based on this invention mentioned later to the load connection ends Pa and Pb is shown here, the LED unit used for the LED lighting devices 80 and 80a is not limited to this, A well-known LED unit can be used.

  The LED lighting device 80 shown in FIG. 1 includes a DC power supply unit 20 that supplies power from an external power supply 10 as a DC current, and first and second switching elements Q1 and Q2, and outputs ( A high-frequency output unit 50 that converts a direct current supplied from the positive electrode B (+) and the negative electrode B (−) into a predetermined high-frequency alternating current and outputs the same, and the first switching element Q1 and the second switching element Q2 And a LC resonance circuit unit 30 connected in parallel to a connection point A (high-frequency output point A) between the first switching element Q1 and the second switching element Q2. And an output rectification unit DB connected to each output point (output point B) of the LC resonance circuit unit 30 and rectifying the AC output from the LC resonance circuit unit 30 and outputting the rectified output to the load connection terminals Pa and Pb. HaveAnd LED unit (for example, LED unit 70) which the some light emitting diode element 72 connected to these load connection ends Pa and Pb connects.

  The external power source 10 supplies power to the LED lighting device 80, and a known power source such as a generator or a battery can be used in addition to a commercial power source of 200V AC or 100V AC. The DC power supply unit 20 converts AC power from the external power supply 10 into DC and outputs it between the positive electrode B (+) and the negative electrode B (−). For example, a full-wave rectification rectifier 22 and a capacitor element And Ca. The capacitor element Ca of the DC power supply unit 20 may be an electrolytic capacitor, a film capacitor, a ceramic capacitor, or the like. When a 100V AC commercial power source is used for the external power source 10 and the above-described capacitor input type rectifier circuit is used for the DC power source unit 20, the LED lighting device 80 according to the present invention has an LED whose forward voltage is up to about 60V. The unit can be lit. By adopting a voltage doubler rectifier rectifier for the rectifier 22, it is possible to light an LED unit having a higher forward voltage than in the case of full wave rectification.

  Further, when measures against fluctuations in the input voltage from the external power supply 10, measures against harmonic distortion of the input current, and higher power factor are to be achieved, an active state is provided between the rectifier 22 and the capacitor element Ca as shown in FIG. A filter circuit 24 may be provided. A non-insulated active filter circuit 24 shown in FIG. 2 has an inductor element La and a diode Da connected in series to the plus output of the rectifier 22, and a drain terminal connected between the inductor element La and the diode Da. A high-frequency switching element Qa whose terminal is connected to the negative output of the rectifying unit 22; a control circuit 25 for turning on / off the high-frequency switching element Qa; and a smoothing capacitor (not shown) for smoothing the output of the rectifying unit 22. Yes. The smoothing capacitor has a small capacity that does not adversely affect the power factor. Then, the control circuit 25 performs on / off control of the high frequency switching element Qa at a predetermined frequency, so that when the high frequency switching element Qa is on, power corresponding to the power supply voltage of the external power supply 10 is stored in the inductor element La. When the element Qa is off, the power stored in the inductor element La is output to the capacitor element Ca side through the diode Da. Thereby, stabilization of the output voltage of the DC power supply unit 20, suppression of harmonic distortion of the input current from the external power supply 10, and higher power factor can be achieved. When an LED unit with a high forward voltage is lit, the inductor element La may be replaced with an insulating transformer to form an insulating active filter circuit, which may function as a flyback switching power supply in consideration of safety. .

  The high-frequency output unit 50 of the LED lighting device 80 is a known inverter circuit that converts a direct current supplied from the positive electrode B (+) and the negative electrode B (−) into a high-frequency alternating current having a predetermined frequency and outputs it. The first and second switching elements Q1 and Q2 are connected in series between the positive electrode B (+) and the negative electrode B (−) of the DC power supply unit 20. The source terminal of the first switching element Q1 is connected to the negative electrode B (−) of the DC power supply unit 20, the drain terminal is connected to the source terminal of the second switching element Q2, and the drain of the second switching element Q2 is connected. The terminal is connected to the positive electrode B (+). A connection point between the first and second switching elements Q1 and Q2 is a high-frequency output point A to the LC resonance circuit unit 30.

  The gate terminals of the first and second switching elements Q1 and Q2 are connected to the high frequency oscillation control unit 40, and are switched alternately by a high frequency signal having a predetermined oscillation frequency output from the high frequency oscillation control unit 40. Then, a high-frequency alternating current having this oscillation frequency is output to the high-frequency output point A. The oscillation frequency of the high-frequency oscillation control unit 40 is set near the resonance point of the LC resonance circuit unit 30.

  As the output rectification unit DB, a known diode bridge circuit or the like that rectifies the AC output from the LC resonance circuit unit 30 can be used. Further, it is preferable to insert a capacitor element Co between the outputs of the output rectifier DB. Note that, by optimizing the capacity of the capacitor element Co, it is possible to suppress the high-frequency ripple current flowing down the LED unit.

  As shown in FIGS. 3 and 4, the LED lighting device 80 according to the present invention intermittently operates the high-frequency oscillation control unit 40 at predetermined time intervals, and the intermittent oscillation modulation unit 42 has a predetermined value. A dimming signal output unit 44 for outputting the dimming signal.

  Here, the dimming operation by the intermittent oscillation modulation unit 42 and the dimming signal output unit 44 will be briefly described. First, an intermittent oscillation modulation unit 42 that intermittently operates the high frequency oscillation control unit 40 as described above is connected to the high frequency oscillation control unit 40, and a dimming signal output unit 44 is connected to the intermittent oscillation modulation unit 42. Here, when a user or the like gives an instruction to dim the LED unit with a dimming rate of 50%, the dimming signal output unit 44 outputs a dimming signal with a dimming rate of 50% to the intermittent oscillation modulation unit 42. As a result, the intermittent oscillation modulator 42 outputs an intermittent signal having a duty ratio at which the LED unit has a dimming rate of 50% to the high frequency oscillation controller 40. As a result, the high frequency oscillation control unit 40 intermittently outputs a high frequency signal for switching at a duty ratio of the intermittent signal. Thereby, the high frequency output part 50 outputs a high frequency alternating current only in the ON period of an intermittent signal. Thereby, the LC resonance circuit unit 30 intermittently outputs the drive current to the load side only during the ON period of the intermittent signal. As a result, the LED unit blinks at high speed, and as a result, the average amount of light decreases and the light is adjusted with a light reduction rate of 50%. For example, when a user or the like gives an instruction to dim the LED unit at 6% (dimming rate 94%), the dimming signal output unit 44 sends the dimming signal having the dimming rate 94% to the intermittent oscillation modulation unit 42. Output to. As a result, the intermittent oscillation modulation unit 42 outputs to the high frequency oscillation control unit 40 an intermittent signal having a duty ratio with a longer off period than when the light attenuation rate is 50%. As a result, the high-frequency oscillation control unit 40, the high-frequency output unit 50, and the LC resonance circuit unit 30 operate intermittently at an off interval longer than that when the dimming rate is 50%. Open and flash. As a result, the average amount of light further decreases, and the LED unit performs dimming operation with a dimming rate of 94%. When dimming is not performed, the high-frequency oscillation control unit 40, the high-frequency output unit 50, and the LC resonance circuit unit 30 operate continuously, and the LED unit is always in an all-light state. The dimming signal output unit 44 and the intermittent oscillation modulation unit 42 can generate a stepless intermittent signal by a known circuit configuration. Further, the period of the intermittent signal is shorter than 2 ms, preferably about 1.5 ms, even at the time of dimming at the maximum dimming rate so that humans do not feel flicker.

  Next, the LC resonance circuit unit 30 of the LED lighting device 80 according to the present invention will be described with reference to FIGS. Here, FIGS. 5A and 5B are circuit diagrams in which one LC resonance circuit unit 30 of the LED lighting device 80 is extracted.

First, in the LC resonance circuit unit 30 shown in FIG. 5A, one end of the resonance inductor element Lf is connected to the high frequency output point A of the high frequency output unit 50, and the other end is connected to the resonance capacitor via the DC blocking capacitor Cdc. Connected to one end of the element Cf. Further, the other end of the resonance capacitor element Cf is connected to the negative electrode B (−) of the DC power supply unit 20 via the current suppression resistor Rs. One end of the resonance capacitor element Cf (the connection point side with the resonance inductor element Lf) is the output point B. In this case, the resonance inductor element Lf, the resonance capacitor element Cf, and the DC blocking capacitor Cdc constitute an LC resonance circuit, and the frequency f0 at the resonance point is the inductor value of the resonance inductor element Lf Lf, the resonance capacitor element When the capacitance value of Cf is Cf and the capacitance value of the DC blocking capacitor Cdc is Cdc, it is calculated by the following equation.
f0 = 1 / (2π × (Lf × (Cf × Cdc) / (Cf + Cdc)) ^1/2 )

The DC blocking capacitor Cdc may be connected in series between the resonance inductor element Lf and the output point B (output rectification unit DB). Therefore, as shown in FIG. 5B, the DC blocking capacitor Cdc may be provided on the output point B side from the connection point of the resonance capacitor element Cf. In this case, the LC resonance circuit of the LC resonance circuit unit 30 includes the resonance inductor element Lf and the resonance capacitor element Cf, and the frequency f0 at the resonance point is calculated by the following equation.
f0 = 1 / (2π × (Lf × Cf) ^1/2 )

  Here, when the LC resonance type LED lighting circuit is operated at a frequency near the resonance point, the current flowing down to the load (LED unit) depends on the supply voltage from the DC power supply unit 20 and the inductance value of the resonance inductor element Lf. It is supposed to be determined uniquely. Therefore, the LED lighting device 80 can stably drive these LED units with a constant current regardless of the variation or magnitude of the forward voltage of the LED units.

  In a general LC resonance circuit, no element other than the load is connected between the resonance inductor element Lf and the resonance capacitor element Cf. However, the LC resonance circuit unit 30 of the LED lighting device 80 according to the present invention has a characteristic configuration in which the anode is connected between the resonance inductor element Lf and the resonance capacitor element Cf, and the cathode is the positive electrode of the DC power supply unit 20. The first voltage limiting diode element D1 connected to B (+), the cathode is connected between the resonance inductor element Lf and the resonance capacitor element Cf, and the anode is connected to the negative electrode B (−) of the DC power supply unit 20. Second voltage limiting diode element D2. The first and second voltage limiting diode elements D1 and D2 have a reverse leakage current that is sufficiently smaller than the output current at the output point B so as not to adversely affect the output of the LC resonance circuit unit 30. In addition, it is preferable to use a capacitor whose junction capacitance is sufficiently smaller than the capacitance of the resonance capacitor element Cf. As such first and second voltage limiting diode elements D1 and D2, it is preferable to use high-speed diodes having a junction capacitance of about 15 pF or less. 5A and 5B show an example in which both the first and second voltage limiting diode elements D1 and D2 are connected. As will be described later, depending on the output voltage of the DC power supply unit 20 or the like. May be only one of the first voltage limiting diode element D1 and the second voltage limiting diode element D2.

Here, the simulation results of the oscillation frequency and the resonance voltage at the output point B (no load) when the first and second voltage limiting diode elements D1 and D2 are not provided are shown in FIG. FIG. 6B shows the simulation result of the elapsed time from the start of resonance and the resonance voltage at the output point B (no load). The values of each element at this time were as follows. In an ideal circuit with no current loss in the circuit with the current suppression resistor Rs being 0Ω, the open circuit voltage under no load is theoretically infinite, but it can cope with infinite loads. Therefore, from the viewpoint of being able to cope with a wide range of load fluctuations, it is preferable to reduce the current suppression resistor Rs and relatively increase the open circuit voltage. Therefore, here, the resistance value of the current suppression resistor Rs is set to 10Ω.
Resonant inductor element Lf: 5.6 mH
Resonance capacitor element Cf: 0.0022 μF
DC blocking capacitor Cdc: 0.1 μF
Current suppression resistor Rs: 10Ω
Resonance point frequency: 45.8 kHz
External power supply voltage: AC200V ± 10%

  As shown in FIG. 6A, the resonance voltage rapidly increased as the oscillation frequency approached the resonance point of 45.8 kHz, and the value at the resonance point was about 28 kV. Further, in order to stably drive the LED unit with a constant current, a resonance voltage at no load is required to be approximately 1200 V or more. Therefore, the oscillation frequency of the high-frequency oscillation control unit 40 is set to a frequency as close as possible to the resonance point between 43.5 KHz and 48 kHz.

  Thus, in order to stably drive the LED unit with a constant current, it is necessary to operate the LC resonance circuit unit 30 at a frequency near the resonance point. However, when the LC resonance circuit unit 30 is operated at a frequency near the resonance point, a high voltage exceeding 1000 V is generated between the load connection terminals Pa and Pb when there is no load. Further, as shown in FIG. 6B, the rise of the resonance voltage is fast and does not require 1 mS to exceed 10 kV. Such a large voltage generated at the no-load load connection terminals Pa and Pb itself has a safety problem, and there is a risk of destroying the circuit elements of the LED lighting device 80 itself.

  In addition, in the method of increasing the resistance value of the current suppression resistor Rs and decreasing the resonance voltage at no load, the loss due to the heat generation of the current suppression resistor Rs is increased and the response is deteriorated. A resonant voltage cannot be obtained.

  In this regard, the LED lighting device 80 according to the present invention is provided between a connection point between the resonance inductor element Lf and the resonance capacitor element Cf of the LC resonance circuit unit 30 and the positive electrode B (+) and the negative electrode B (−). First and second voltage limiting diode elements D1 and D2 are provided. For this reason, when the voltage on the output side of the resonant inductor element Lf becomes larger than the positive electrode B (+) of the DC power supply unit 20 when there is no load, the first voltage limiting diode element D1 operates and operates on the positive electrode B (+) side. Current flows down. On the other hand, when the voltage on the output side of the resonant inductor element Lf becomes smaller than the negative electrode B (−) of the DC power supply unit 20, the second voltage limiting diode element D2 operates and current flows from the negative electrode B (−) side. Flow down. As a result, the voltage on the output side of the resonance inductor element Lf is limited between the negative electrode B (−) and the positive electrode B (+). As a result, the output voltage of the LC resonance circuit unit 30 is also limited according to the potentials of the positive electrode B (+) and the negative electrode B (−).

  Here, FIG. 7 shows a graph of the output voltage at the output point B when the LC resonance circuit unit 30 including the first and second voltage limiting diode elements D1 and D2 is not loaded. The value of each element is the same as in FIG. 6, the maximum output voltage (overvoltage) of the DC power supply unit 20 at no load is 360 Vdc, and the DC power supply during rated operation (when the load is fully connected) The output voltage of the unit 20 was 270 Vdc.

  In this configuration, the voltage on the output side of the resonance inductor element Lf is set to 0V to between the positive electrode B (+) and the negative electrode B (−) of the DC power supply unit 20 by the first and second voltage limiting diode elements D1 and D2. Limited to 360V. Therefore, the voltage at the output point B shown in FIG. 7 is an AC voltage whose upper limit is limited to about 180V and lower limit is about −180V, and it can be seen that an excessive voltage is not output even when there is no load.

  Next, the LED lighting device 80 having the first and second voltage limiting diode elements D1 and D2 and having a dimming function is used, and the number of light emitting diode elements 72 is set between the load connection terminals Pa and Pb. FIG. 8 (a) shows a graph of the current value when changed and connected in series. FIG. 8B shows a graph of the number of light-emitting diode elements and the current value at that time during dimming with an intermittent signal. Here, the solid line in FIG. 8A is the LED lighting device 80 according to the present invention provided with the first and second voltage limiting diode elements D1 and D2, and the broken line is provided with the voltage limiting diode elements D1 and D2. It is not a conventional LED lighting device. Further, the current value in FIG. 8B uses an average value with a sampling rate of 100 ms to 500 ms, and the current value increases or decreases according to the length of the OFF period of the intermittent operation.

  From FIG. 8A, there is no significant difference between the number of light emitting diode elements 72 connected in series up to 42 (forward voltage 126 Vdc), and the first and second voltage limiting diode elements D1, D2 are not recognized. It can be seen that stable constant current driving of the LED unit is possible regardless of the presence or absence of the LED. Therefore, it can be seen that the LED lighting device 80 according to the present invention can stably drive the LED unit having a forward voltage up to about 50% of the output voltage (270 Vdc) at the rated operation of the DC power supply unit 20 stably. .

  Further, from FIG. 8B, the current value that flows even during dimming with a light attenuation rate of 50% and a light attenuation rate of 94% shows the same behavior as in the case of all light, and the first and second voltage limiting diode elements. It can be seen that D1 and D2 do not affect the light control by the intermittent signal.

  Next, a graph of the output voltage at the output point B when no load is applied to the LC resonance circuit unit 30 having only the first voltage limiting diode element D1 is shown in FIG. 9A, and the second voltage limiting diode element D2 is shown. FIG. 9B shows a graph of the output voltage at the output point B of the LC resonance circuit unit 30 having only the no load.

  From FIG. 9A, the upper limit voltage of the output point B of the LC resonance circuit unit 30 including the first voltage limiting diode element D1 is limited to about 180 V by the function of the first voltage limiting diode element D1. I understand that. Further, although there is no limit on the lower limit side, the positive voltage resonance is limited by the first voltage limiting diode element D1, so that the voltage growth is suppressed and maintained at about -380V. Further, from FIG. 9B, the lower limit voltage of the output point B of the LC resonant circuit unit 30 including the second voltage limiting diode element D2 is limited to about −180 V by the function of the second voltage limiting diode element D2. It can be seen that Further, although there is no limit on the upper limit side, the negative voltage resonance is limited by the second voltage limiting diode element D2, so that the voltage growth is suppressed and maintained at about 380V. Thus, even when only one of the first voltage limiting diode element D1 and the second voltage limiting diode element D2 is connected, an excessive voltage exceeding 1000 V is output to the load connection terminals Pa and Pb. I understand that I don't. Therefore, for example, when the output voltage of the DC power supply unit 20 is relatively low and the safety or the like is sufficient even when the limitation is performed only on one side, the first and second voltage limiting diode elements D1 and D2 may be used as either one.

  Next, the operation of the LED lighting device 80 will be described. Here, an example of the LED lighting device 80 having both the first and second voltage limiting diode elements D1 and D2 and having a dimming function will be described. First, an LED unit (for example, LED unit 70) is connected between the load connection ends Pa and Pb, and the LED lighting device 80 is turned on. Thereby, the DC power supply unit 20 converts the electric power from the external power supply 10 into a DC current and supplies it to the high-frequency output unit 50 side. The high frequency oscillation control unit 40 outputs a preset high frequency signal to the high frequency output unit 50. Note that the high frequency signal at this time is a frequency near the resonance point of the LC resonance circuit unit 30. As a result, the first and second switching elements Q1 and Q2 of the high-frequency output unit 50 are alternately turned on / off, and a high-frequency alternating current having a frequency near the resonance point is applied to each LC resonance circuit unit 30 via the high-frequency output point A. Output. As a result, each LC resonance circuit unit 30 resonates and outputs an alternating current to the output rectification unit DB via the output point B. The output rectifier DB rectifies this alternating current and outputs it to the load connection terminals Pa and Pb. As a result, the LED unit is stably lit by constant current driving without depending on the forward voltage.

  Next, the user instructs the LED lighting device 80 to perform a dimming operation with a predetermined dimming rate. As a result, the dimming signal output unit 44 outputs a dimming signal corresponding to this instruction to the intermittent oscillation modulation unit 42. As a result, the intermittent oscillation modulation unit 42 outputs an intermittent signal having a duty ratio corresponding to the instructed dimming rate to the high frequency oscillation control unit 40. Thereby, the high frequency oscillation control unit 40, the high frequency output unit 50, and the LC resonance circuit unit 30 perform an intermittent operation according to the duty ratio of the intermittent signal. As a result, the LED unit blinks at high speed, and the amount of light decreases according to the duty ratio. Thereby, the light control with respect to an LED unit is performed. In the case of a load with an LED unit connected, the first and second voltage limiting diode elements D1 and D2 basically do not operate and do not participate in the lighting operation and the dimming operation.

  Next, when the LED units of specific load connection ends Pa and Pb are removed, the resonance voltage of the LC resonance circuit unit 30 increases. However, when the voltage on the output side of the resonant inductor element Lf exceeds the potential of the positive electrode B (+) and the negative electrode B (−) of the DC power supply unit 20, the first and second voltage limiting diode elements D1 and D2 operate. To do. Thereby, the voltage on the output side of the resonance inductor element Lf is limited to the range of the positive electrode B (+) and the negative electrode B (−). As a result, the output voltage at the output point B and the load connection ends Pa and Pb is also limited accordingly, and an excessive voltage is not generated at the load connection ends Pa and Pb.

  Thus, by providing the first and second voltage limiting diode elements D1 and D2, it is possible to prevent a high voltage from being generated at the no-load load connection ends Pa and Pb. However, depending on the specifications of the LED lighting device 80, it may be required to set the output voltage of the no-load load connection terminals Pa and Pb to 0V. Next, the configuration of the LED lighting device 80a according to the second embodiment of the present invention corresponding to this specification will be described with reference to FIGS. FIG. 10 is a diagram showing a second form of LED lighting device 80a that does not have a dimming function, and FIG. 11 is a diagram that shows a second form of LED lighting device 80a that has a dimming function.

  The LED lighting device 80a of the second embodiment shown in FIGS. 10 and 11 has a protection circuit 60 between the output rectification unit DB and the load connection terminals Pa and Pb. Next, an example of the protection circuit 60 suitable for the LED lighting device 80a will be described. First, a protection circuit 60 suitable for the LED lighting device 80a includes a no-load detection unit 62 that emits a no-load signal when the load connection ends Pa and Pb are unloaded, and a load connection end Pa and Pb between the load connection ends Pa and Pb. A protective switching element (SCR) that short-circuits and a holding wiring 66 for supplying a holding current that maintains the short-circuit state of the protective switching element (SCR). Note that a known thyristor SCR is preferably used as the protective switching element.

  The no-load detection unit 62 of the protection circuit 60 includes a voltage detection resistor Re that detects a voltage between the load connection terminals Pa and Pb, a current detection resistor Ri that detects a current flowing through the load, a voltage detection resistor Re, and a current detection. A no-load detection circuit 62a for detecting the presence or absence of a load from the value of the resistor Ri and generating a no-load signal. Further, the thyristor SCR as a protection switching element is connected between the outputs of the output rectifier DB via a diode element Db. At this time, the anode of the diode element Db is connected to the positive electrode of the output rectifier DB, and the cathode is connected to the anode of the thyristor SCR. Further, the cathode of the thyristor SCR is connected to the negative electrode of the output rectifier DB, and the no-load detection circuit 62a is connected to the gate of the thyristor SCR so that a no-load signal is input. Further, the holding wiring 66 connected to the positive electrode B (+) is connected to the anode of the thyristor SCR via the protective resistor Ra. Furthermore, a malfunction prevention capacitor Cb is connected to the signal line of the no-load signal.

  Next, the operation of the protection circuit 60 will be described. First, when an LED unit (for example, LED unit 70) is connected to the load connection ends Pa and Pb, the no-load detection circuit 62a is predetermined between the voltage detection resistor Re and the current detection resistor Ri and the load connection ends Pa and Pb. It is recognized that a predetermined current is flowing between the load connection terminals Pa and Pb. In this case, the no-load detection circuit 62a determines that there is a load (LED unit) and does not output a no-load signal. As a result, the thyristor SCR as the protection switching element maintains the off state.

  Next, when the LED unit is removed, for example, when there is no load between the load connection ends Pa and Pb, the no-load detection circuit 62a is predetermined between the voltage detection resistor Re and current detection resistor Ri and the load connection ends Pa and Pb. It is recognized that a high voltage exceeding the threshold value is generated, the load connection terminals Pa and Pb are opened, and the current flow is stopped. In this case, the no-load detection circuit 62a determines that there is no load between the load connection ends Pa and Pb and outputs a no-load signal. At this time, the malfunction prevention capacitor Cb operates to buffer the transmission of the no-load signal, and transmits the no-load signal to the thyristor SCR when the no-load signal is continuously generated for a certain period of time. As a result, the thyristor SCR is turned on to short-circuit the outputs of the output rectifier DB. Thereby, between the load connection ends Pa and Pb is 0V. When the thyristor SCR is turned on, the holding current always flows through the holding wiring 66. This holding current continues to flow even during the off period when the LED lighting circuit is stopped by the dimming operation. As a result, the thyristor SCR is not reset even in the off period and remains in the on state.

  Here, the protection circuit 60 requires a no-load signal that continues for a certain period of time to prevent malfunction. However, when the first and second voltage limiting diode elements D1 and D2 are not present, a high voltage exceeding 10 kV is generated in the load connection terminals Pa and Pb and the circuit before the protection circuit 60 operates, and the circuit element is damaged. There is a risk of doing. In this regard, in the LED lighting device 80a according to the present invention, the first and second voltage limiting diode elements D1 and D2 function and do not output an excessive voltage even before the protection circuit 60 operates. Therefore, the LED lighting device 80a according to the present invention has two levels of high safety, and the malfunction prevention time can be set relatively freely according to the operation and specifications of the LED lighting device 80.

  Next, an LED unit 70 suitable for the LED lighting devices 80 and 80a according to the present invention will be described with reference to FIG. Here, FIG. 12A is an example in which an NPN transistor is used as the transistor element TR of the LED unit 70, and FIG. 12B is an example in which a PNP transistor is used as the transistor element TR. In FIG. 12, the LED unit 70 has three LED units 73. However, the number of LED units 73 is not particularly limited, and the number of connected units such as 2, 4, 5, 6, etc. You may do it.

  The LED unit 70 according to the present invention shown in FIG. 12 is configured by connecting a plurality of light emitting diode rows 73 in which a plurality of light emitting diode elements 72 are connected in series. The LED unit 70 according to the present invention has a transistor element TR for each light emitting diode row 73, and an emitter resistor Rb is connected to the emitter of the transistor element TR. These transistor elements TR are connected so that the light-emitting diode array 73, the collector and emitter of the transistor element TR, and the emitter resistor Rb are in series. Therefore, when the transistor element TR is an NPN type transistor, as shown in FIG. 12A, the output from the load connection terminal Pa of the positive electrode (+) branches in parallel to the number of the light emitting diode rows 73, After the light emitting diode array 73, the collector of the transistor element TR, the emitter, and the emitter resistor Rb are connected in series, they are joined together and connected to the load connection terminal Pb of the negative electrode (−). Further, a base line is connected to the load connection terminal Pa of the positive electrode (+), and this base line branches after passing through the base resistor Rc and is connected to the bases of all the transistor elements TR. Therefore, the base current from the same potential flows through all the transistor elements TR.

  When the transistor element TR is a PNP type transistor, as shown in FIG. 12B, the output from the load connection terminal Pa of the positive electrode (+) branches in parallel to the number of the light emitting diode rows 73, The emitter resistor Rb, the emitter and collector of the transistor element TR, and the light-emitting diode array 73 are connected in series, and then merged and connected to the negative (−) load connection terminal Pb. Further, after all the base lines of the respective transistor elements TR are merged, they are connected to the load connection terminal Pb of the negative electrode (−) through the base resistance Rc. Therefore, the base current from the same potential flows through all the transistor elements TR.

Here, Table 1 shows values of currents flowing through the LED unit 70 according to the present invention and the light emitting diode array 73 of the conventional LED unit 7. Note that the LED unit 70 having the circuit configuration shown in FIG. The number of elements in the light-emitting diode array 73 (the number of light-emitting diode elements 72) is seven, and the resistance values of the current limiting resistor R and the emitter resistor Rb are 10Ω with a loss within an allowable range. Further, the drive current (applied current between the load connection terminals Pa and Pb) of the LED unit 70 was 150 mA, and the base resistance Rc was 4.7 kΩ. Note that the forward voltage of the light emitting diode element 72 is selected from those having a specified value of 2.8 V (at 50 mA), and the light emitting diode row 73 (first row) having a low forward voltage intentionally and the average forward direction. A light emitting diode row 73 (second row, third row) of voltage was produced and used.

  From Table 1, in the conventional LED unit 7, the current value of the light emitting diode row 73 of the first row in which the forward voltage was intentionally lowered was 64.1 mA, whereas the second value of the average forward voltage was 2nd. The current values of the light emitting diode row 73 in the third row and the third row were 42.4 mA and 43.5 mA, respectively, and the current distribution ratios were 42.7%, 28.3%, and 29.0%, respectively. Therefore, when the current limiting resistance R is set to 10Ω with low loss, in the conventional LED unit 7, the second row and the third row of light emitting diode rows 73 are added to the first row of light emitting diode rows 73 having a low forward voltage. It can be seen that about 1.5 times the current flows. In this case, the light emitting diode row 73 in the first row is relatively bright, the light emitting diode rows 73 in the second row and the third row emit light relatively dark, and the illuminance varies as a whole of the LED unit 7. Moreover, in the light emitting diode row | line | column 73 with the large electric current which flows down, there exists a possibility that the lifetime of the light emitting diode element 72 to comprise may be shortened.

  However, in the LED unit 70 according to the present invention, the current value of the first light-emitting diode array 73 is 51.1 mA, and the current value of the second and third light-emitting diode arrays 73 is 48.3 mA, respectively. It is 48.5 mA (base current 2.1 mA), and the current distribution ratios are 34.6%, 32.7%, and 32.8%, respectively, and it can be seen that substantially the same current flows. For this reason, the LED unit 70 according to the present invention hardly varies in illuminance, and the consumption of each light emitting diode element 72 can be averaged.

Next, Table 2 shows current values when two of the light emitting diode elements 72 in the first row are short-circuited to substantially have five elements.

  From Table 2, in the conventional LED unit 7, the current values flowing through the light emitting diode rows 73 are 146.4 mA, 1.8 mA, and 1.8 mA, respectively, and the current distribution ratios are 97.6%, 1.2%, 1.2%, and the current concentrates on the first light-emitting diode array 73 in which the two light-emitting diode elements 72 are short-circuited, and almost no current flows in the second and third light-emitting diode arrays 73. I understand. In this case, in addition to the light emitting diode rows 73 in the second row and the third row not being lit, an excessive current flows through the light emitting diode elements 72 in the first row, thereby shortening the life.

  On the other hand, in the LED unit 70 according to the present invention, the current values flowing through the light emitting diode rows 73 are 52.5 mA, 47.2 mA, and 47.7 mA (base current 2.6 mA), respectively, and the current distribution ratios are respectively It becomes 35.6%, 32.0%, 32.4%, and a big variation does not arise. Therefore, in the LED unit 70 according to the present invention, even when two light emitting diode elements 72 are short-circuited and the light emitting diode arrays 73 having greatly different forward voltages are connected, there is a large deviation in the current value of each light emitting diode array 73. It can be seen that all the light emitting diode rows 73 can emit light continuously without being generated. That is, in the LED unit 70 according to the present invention, for example, even when an arbitrary light emitting diode element 72 is damaged and short-circuited, the influence can be kept to a minimum and the lighting operation as a whole unit can be continued. In this current distribution function, by making the base potential of the transistor elements TR connected to each light emitting diode row 73 the same, each current flowing down to each light emitting diode row 73 (emitter resistor Rb) is equalized. This is because the transistor element TR operates and the transistor element TR side determines these current values predominantly.

  The LED unit 70 according to the present invention may be integrated with the LED lighting devices 80 and 80a to constitute the LED lighting devices 80 and 80a as a whole. At this time, the LED unit 70 is preferably detachable with respect to the load connection ends Pa and Pb, but may be configured with the same substrate. Furthermore, each part of the LED lighting devices 80 and 80a may be configured by the same substrate. As shown in FIG. 13, for example, the signal output unit 92 having the dimming signal output unit 44, the DC power supply unit 20, and the high frequency output The circuit 50, the LC resonance circuit unit 30, the power supply circuit unit 94 including the voltage limiting diode elements D1 and D2, the output circuit rectification unit 96 including the output rectification unit DB and the protection circuit 60, etc. You may do it.

  As described above, the LED lighting devices 80 and 80a according to the present invention include the first and second elements between the resonance inductor element Lf and the resonance capacitor element Cf that are not connected to each other in a general LC resonance circuit. The voltage limiting diode elements D1 and D2 are connected. Then, the first and second voltage limiting diode elements D 1 and D 2 are connected to the positive electrode B (+) and the negative electrode B (−) of the DC power supply unit 20. As a result, the potential on the output side of the resonance inductor element Lf is limited to the positive electrode B (+) and the negative electrode B (−) of the DC power supply unit 20, and the output voltage of the LC resonance circuit unit 30 is also limited accordingly. . For this reason, an excessive voltage is not output to the no-load load connection ends Pa and Pb. Further, since an excessive voltage is not output to the no-load load connection terminals Pa and Pb, the malfunction prevention time of the protection circuit 60 can be set relatively freely.

  The operations of the first and second voltage limiting diode elements D1 and D2 do not affect the dimming operation by the intermittent signal. For this reason, the LED lighting devices 80 and 80a according to the present invention can achieve both deep dimming by intermittent operation and high voltage countermeasures during no load.

  In addition, the LED unit 70 according to the present invention is provided with a transistor element TR for each of the light emitting diode rows 73 connected in parallel, and a base current from the same potential flows through the transistor element TR. In this configuration, the current value flowing down to the light emitting diode row 73 is determined predominantly by the transistor element TR, so that a large deviation occurs in the flowing current value even if the forward voltage of the light emitting diode row 73 varies. do not do. For this reason, the LED unit 70 according to the present invention does not need to use the current limiting resistor R having a large resistance value, and functions with the emitter resistor Rb having a small resistance value and a low loss. Thereby, the efficiency as the LED unit 70 as a whole increases, and an energy-saving LED unit with low power consumption can be obtained.

  Further, by connecting the LED unit 70 to the LED lighting devices 80 and 80a according to the present invention, it becomes possible to perform constant current driving not for each LED unit but for each light emitting diode array 73, and to maximize the merit of constant current driving. LED lighting devices 80 and 80a can be obtained. Furthermore, since the LED unit 70 according to the present invention has high efficiency and low power consumption as described above, it is possible to obtain the LED lighting devices 80 and 80a that are extremely energy saving.

  In addition, since said LED lighting device 80, 80a and LED unit 70 are examples, it is possible to change and implement the circuit of each part, a numerical value, a wiring route, etc. in the range which does not deviate from the summary of this invention. .

20 DC power supply
24 Non-isolated active filter circuit
30 LC resonance circuit
40 High frequency oscillation controller
42 Intermittent oscillation modulator
60 Protection circuit
62 No-load detector
66 Retention wiring
70 LED unit
72 Light Emitting Diode Device
73 Light Emitting Diode Array
80, 80a LED lighting device
A High frequency output point
D1 first voltage limiting diode element
D2 Second voltage limiting diode element
DB output rectifier
Cdc DC blocking capacitor
Cf resonant capacitor element
Lf Resonant inductor element
Pa, Pb Load connection end
Q1 first switching element
Q2 Second switching element
Rb Emitter resistance
SCR protection switching element (thyristor)
TR transistor element

Claims (10)

A DC power supply for supplying DC current;
A first switching element and a second switching element connected in series between the outputs of the DC power supply unit;
A high-frequency oscillation controller that alternately turns on and off the first switching element and the second switching element;
A plurality of LC resonance circuit parts connected in parallel to a connection point between the first switching element and the second switching element;
An output rectifier connected to each output point of the LC resonant circuit unit, rectifying an AC output from the LC resonant circuit unit and outputting the rectified output to a load connection end, and
The LC resonance circuit unit includes a resonance inductor element having one end connected to a connection point between the first switching element and the second switching element, the other end of the resonance inductor element, and a negative electrode of the DC power supply unit. A resonance capacitor element connected between
In the LED lighting device for multiple lamps that the LED unit is connected to the load connection end,
The LC resonance circuit section includes a first voltage limiting diode element having a cathode connected to the positive electrode of the DC power supply section and an anode connected between the resonance inductor element and the resonance capacitor element, and a cathode for the resonance. An LED lighting device comprising at least one of a second voltage limiting diode element connected between an inductor element and a resonance capacitor element and having an anode connected to a negative electrode of the DC power supply unit. The LED lighting device according to claim 1, further comprising an intermittent oscillation modulation unit that intermittently operates the high-frequency oscillation control unit at a predetermined time interval. 3. The LED lighting device according to claim 1, wherein the LC resonance circuit unit includes both a first voltage limiting diode element and a second voltage limiting diode element. 4. Each has a protection circuit between the output rectifier and the load connection end,
The protection circuit is
A no-load detector that emits a no-load signal when the load connection end is no load; and
A protective switching element that short-circuits between the load connection ends by the no-load signal;
4. A holding wiring that flows a holding current through the protection switching element and maintains a short-circuited state of the protection switching element during an OFF period during intermittent operation. LED lighting device of description. 5. The DC blocking capacitor is connected between the resonance inductor element and the resonance capacitor element, or between the resonance capacitor element and the output rectification unit. 6. LED lighting device. The LED lighting device according to any one of claims 1 to 5, wherein the DC power supply unit rectifies the commercial power supply by a full-wave rectifier circuit or a voltage doubler rectifier circuit. The LED lighting device according to any one of claims 1 to 6, wherein the DC power supply unit includes a non-insulated active filter circuit or an insulated active filter circuit. In an LED unit in which a plurality of light emitting diode rows in which a plurality of light emitting diode elements are connected in series are connected in parallel,
A transistor element is provided for each light emitting diode row,
The light emitting diode array, the collector, emitter and emitter resistance of the transistor element are connected in series, and all the bases of the transistor elements are connected so that a base current from the same potential is applied to all the transistor elements. An LED unit that is allowed to flow down. The load connection end has an LED unit in which a plurality of light emitting diode rows in which a plurality of light emitting diode elements are connected in series are connected in parallel,
The LED unit is
A transistor element is provided for each light emitting diode row,
The light emitting diode array, the collector, emitter and emitter resistance of the transistor element are connected in series, and all the bases of the transistor elements are connected so that a base current from the same potential is applied to all the transistor elements. The LED lighting device according to claim 1, wherein the LED lighting device is allowed to flow down. The LED lighting device according to any one of claims 1 to 7, wherein the circuit board is formed integrally or divided at an arbitrary circuit point.