CN104349544A - LED driving apparatus and illuminating device - Google Patents
LED driving apparatus and illuminating device Download PDFInfo
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- CN104349544A CN104349544A CN201410350686.7A CN201410350686A CN104349544A CN 104349544 A CN104349544 A CN 104349544A CN 201410350686 A CN201410350686 A CN 201410350686A CN 104349544 A CN104349544 A CN 104349544A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
提供LED驱动装置以及照明器具。LED驱动装置构成为通过将输入电力变换为直流电力并将直流电力供给到多个LED光源侧，来对多个LED光源进行驱动。LED驱动装置具备：调整部，其分别调整要向多个LED光源侧供电的直流电力，将分别调整后的该直流电力作为向多个LED光源各自的输出；以及控制部。控制部构成为在用于分别检测多个LED光源的异常的异常检测部检测出多个LED光源的一部分的异常时，进行调整部的控制以使调整部向该一部分的输出停止，并且使调整部向多个LED光源的剩余部分的输出增大。
We provide LED driving devices and lighting fixtures. The LED drive device is configured to drive a plurality of LED light sources by converting input power into DC power and supplying the DC power to the sides of the plurality of LED light sources. The LED drive device includes: an adjustment unit that adjusts DC power to be supplied to the plurality of LED light sources, and outputs the adjusted DC power to each of the LED light sources; and a control unit. The control unit is configured to control the adjustment unit to stop the output of the adjustment unit to the part, and to adjust part to increase the output of the remainder of the plurality of LED light sources.
Description
Technical field
The present invention relates to a kind of LED drive device and ligthing paraphernalia.
Background technology
Japanese Unexamined Patent Publication No 2011-154841 (hereinafter referred to as " document 1 ") discloses a kind of LED lamp device.Device described in document 1 possesses DC/DC transducer, switch control portion, PWM (Pulse Width Modulation: pulse-width modulation) controller and abnormity detection portion.The connection of switch control portion to the output of two LED light sources and DC/DC transducer carries out switching controls with selecting a property.PWM controller correspondingly makes the output of DC/DC transducer increase or reduce with the LED light source being connected to the output of DC/DC transducer by switch control portion.Abnormity detection portion detects the exception (short circuit, non-loaded etc.) of two LED light sources respectively, stops to detecting that the LED light source of an abnormal side is powered.
In the device described in document 1, by stopping powering make it extinguish to creating abnormal LED light source, easily identify that this LED light source creates exception thus.
In addition, in the LED drive device as the device described in document 1, multiple LED light source driven, there is following situation: when some LED light sources create abnormal, if just stop the driving of this LED light source (making this LED light source extinguish), produce undesirable condition.Such as, when LED light source be used in road lighting, tunnel illumination light source, due to multiple LED light source a part extinguish and likely cause being difficult to guarantee required MIN illumination.
Summary of the invention
The present invention completes in view of above-mentioned problem, its object is to suppress the illumination when a part of LED light source creates abnormal to decline.
LED drive device of the present invention (A1, A2) is configured to, by input electric power being transformed to direct current power and above-mentioned direct current power being supplied to multiple LED light source (B1, B2) side, drive above-mentioned multiple LED light source (B1, B2).Above-mentioned LED drive device (A1, A2) possesses abnormity detection portion (3), adjustment part (C) and control part (D).Above-mentioned abnormity detection portion (3) is configured to the exception detecting above-mentioned multiple LED light source (B1, B2) respectively.Above-mentioned adjustment part (C) is configured to adjust respectively will to the above-mentioned direct current power of above-mentioned multiple LED light source (B1, B2) side supply, using this direct current power after adjustment respectively as to the respective output of above-mentioned multiple LED light source (B1, B2).Above-mentioned control part (D) is configured to when above-mentioned abnormity detection portion (3) detects the exception of a part for above-mentioned multiple LED light source (B1, B2), the control carrying out above-mentioned adjustment part (C) stops to the output of this part to make above-mentioned adjustment part (C), and above-mentioned adjustment part (C) is increased to the output of the remainder of above-mentioned multiple LED light source (B1, B2).
In one embodiment, above-mentioned LED drive device (A1) possesses ac/dc transformation component (4).Above-mentioned ac/dc transformation component (4) is configured to the alternating electromotive force as above-mentioned input electric power to be transformed to direct current power.Above-mentioned adjustment part (C) possesses multiple DC/DC conversion portion (1,2), and the plurality of DC/DC conversion portion (1,2) are connected in parallel in the output end of above-mentioned ac/dc transformation component (4).Above-mentioned multiple LED light source (B1, B2) is one by one connected with multiple output end of above-mentioned multiple DC/DC conversion portion (1,2).Above-mentioned multiple DC/DC conversion portion (1,2) is configured to the above-mentioned direct current power from above-mentioned ac/dc transformation component (4) to be transformed to the direct current power corresponding with the control of above-mentioned control part (D) respectively.
In one embodiment, above-mentioned LED drive device (A2) possesses multiple ac/dc transformation component (4A, 4B).Above-mentioned multiple ac/dc transformation component (4A, 4B) is configured to the alternating electromotive force as above-mentioned input electric power to be transformed to direct current power respectively.Above-mentioned adjustment part (C) possesses multiple DC/DC conversion portion (1,2), and the plurality of DC/DC conversion portion (1,2) are one by one connected with multiple output end of above-mentioned multiple ac/dc transformation component (4A, 4B).Above-mentioned multiple LED light source (B1, B2) is one by one connected with multiple output end of above-mentioned multiple DC/DC conversion portion (1,2).Above-mentioned multiple DC/DC conversion portion (1,2) is configured to each direct current power from above-mentioned multiple ac/dc transformation component (4A, 4B) to be transformed to the direct current power corresponding with the control of above-mentioned control part (D).
In one embodiment, above-mentioned control part (D) is configured to make above-mentioned adjustment part (C) to above-mentioned multiple LED light source (B1 in the control carrying out above-mentioned adjustment part (C), the value of output B2) is than above-mentioned multiple LED light source (B1, B2) when respective rated value is low, above-mentioned multiple LED light source (B1 is detected in above-mentioned abnormity detection portion (3), during the exception of a part B2), carry out the control of above-mentioned adjustment part (C) to make above-mentioned adjustment part (C) to above-mentioned multiple LED light source (B1, B2) output of a part stops, and make above-mentioned adjustment part (C) to above-mentioned multiple LED light source (B1, the value of the output of remainder B2) is close to above-mentioned rated value.
In one embodiment, above-mentioned control part (D) is configured to make above-mentioned adjustment part (C) to above-mentioned multiple LED light source (B1 in the control carrying out above-mentioned adjustment part (C), the value of output B2) is than above-mentioned multiple LED light source (B1, B2) when respective rated value is low, above-mentioned multiple LED light source (B1 is detected in above-mentioned abnormity detection portion (3), during the exception of a part B2), carry out the control of above-mentioned adjustment part (C) to make above-mentioned adjustment part (C) to above-mentioned multiple LED light source (B1, B2) output of a part stops, and make above-mentioned adjustment part (C) to above-mentioned multiple LED light source (B1, the value of the output of remainder B2) is consistent with above-mentioned rated value.
In one embodiment, above-mentioned multiple LED light source (B1, B2) comprises the first LED light source and the second LED light source (B1, B2).Above-mentioned control part (D) is configured to make above-mentioned adjustment part (C) to above-mentioned first LED light source and above-mentioned second LED light source (B1 in the control carrying out above-mentioned adjustment part (C), the value of output B2) is mutually the same and than above-mentioned first LED light source and above-mentioned second LED light source (B1, B2) when respective rated value is low, above-mentioned first LED light source and above-mentioned second LED light source (B1 is detected in above-mentioned abnormity detection portion (3), during the exception of a side B2), carry out the control of above-mentioned adjustment part (C) to make above-mentioned adjustment part (C) to above-mentioned first LED light source and above-mentioned second LED light source (B1, the output of the side B2) stops, and make above-mentioned adjustment part (C) to above-mentioned first LED light source and above-mentioned second LED light source (B1, the value of the output of the opposing party B2) becomes the value of 2 times of this output, or make the value of this output become this rated value when this value of 2 times exceedes above-mentioned rated value.
Ligthing paraphernalia of the present invention possesses above-mentioned LED drive device (A1, A2), the multiple LED light sources (B1, B2) driven by above-mentioned LED drive device (A1, A2) and at least keeps the appliance body (70) of above-mentioned multiple LED light source (B1, B2).
LED drive device of the present invention and ligthing paraphernalia have following effect: control part controls light modulation portion and in multiple LED light source, do not detect that the output of abnormal LED light source increases to make adjustment part (C) by abnormity detection portion, therefore, it is possible to suppress the illumination when a part of LED light source creates abnormal to decline.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the execution mode representing LED drive device involved in the present invention.
Fig. 2 is the circuit diagram of the abnormity detection portion of above-mentioned LED drive device.
Fig. 3 is the circuit diagram of another execution mode representing LED drive device involved in the present invention.
Fig. 4 is the circuit diagram of the another execution mode representing LED drive device involved in the present invention.
The C of A ~ Fig. 5 of Fig. 5 is the oscillogram of the action specification of above-mentioned LED drive device.
Fig. 6 is the circuit diagram of other structure of the DC/DC transducer represented in above-mentioned LED drive device.
The B of A and Fig. 7 of Fig. 7 represents the execution mode of ligthing paraphernalia involved in the present invention, and the A of Fig. 7 is end view, and the B of Fig. 7 is bottom view.
Embodiment
Below, the LED drive device in the execution mode involved by present invention will be described in detail with reference to the accompanying.
The LED drive device A1 of present embodiment possesses adjustment part C, abnormity detection portion 3, ac/dc transformation component 4, full-wave rectifier 5, control part D and light adjusting circuit portion 6 etc. as shown in Figure 1.In the example in fig 1, adjustment part C is made up of DC/DC conversion portion 1 and DC/DC conversion portion 2.Ac/dc transformation component 4 is made up of power-factor improvement (Power Factor Correction: power factor correction) circuit.
Full-wave rectifier 5 is made up of diode bridge, outputs to ac/dc transformation component 4 after carrying out full-wave rectification to the alternating voltage supplied from AC power E and alternating current.
Ac/dc transformation component 4 is configured to the alternating electromotive force as input electric power to be transformed to direct current power.In the example in fig 1, ac/dc transformation component 4 is made up of well-known boost chopper in the past, and this boost chopper comprises the switch element 41 be made up of field-effect transistor, the PFC control circuit 40, choking-winding 42, diode 43, smmothing capacitor 44 etc. of switch element 41 being carried out to switch control rule.Wherein, the action of this boost chopper is in the past well-known, therefore detailed.
Multiple DC/DC conversion portion 1 and 2 is connected in parallel in the output end of ac/dc transformation component 4.At this, the output end of ac/dc transformation component 4 is made up of the two ends of smmothing capacitor 44.Multiple DC/DC conversion portion 1 and 2 be configured to respectively by from exchanging/direct current power in DC converting portion 4 is transformed to the direct current power corresponding with the control of control part D.In the example in fig 1, DC/DC conversion portion 1 is well-known buck circuit in the past, comprises switch element 11, inductor 12, diode 13, smmothing capacitor 14, detects winding 15 and diode 16 etc.The negative electrode of diode 13 is connected with the cathode output end of the output end of ac/dc transformation component 4, and the anode of diode 13 is connected with the drain electrode of switch element 11.The source electrode of switch element 11 is connected with the cathode output end of the ac/dc transformation component 4 be grounded.The first end of inductor 12 is connected with the anode of diode 13, and the second end of inductor 12 is connected with the negative pole end of smmothing capacitor 14.The positive terminal of smmothing capacitor 14 is connected with the negative electrode of diode 13.And the two ends of smmothing capacitor 14 form the output end in DC/DC conversion portion 1, and it is connected with in multiple LED light source B1 and B2, i.e. LED light source B1.In addition, detect winding 15 and inductor 12 magnetic coupling, detect the first end ground connection of winding 15, and the second end detecting winding 15 is connected with the anode of diode 16.And the negative electrode of diode 16 is connected with abnormity detection portion 3.
In the example in fig 1, DC/DC conversion portion 2 is also well-known buck circuit in the past, comprises switch element 21, inductor 22, diode 23, smmothing capacitor 24, detects winding 25 and diode 26 etc.The negative electrode of diode 23 is connected with the cathode output end of ac/dc transformation component 4, and the anode of diode 23 is connected with the drain electrode of switch element 21.The source electrode of switch element 21 is grounded.The first end of inductor 22 is connected with the anode of diode 23, and the second end of inductor 22 is connected with the negative pole end of smmothing capacitor 24.The positive terminal of smmothing capacitor 24 is connected with the negative electrode of diode 23.And the two ends of smmothing capacitor 24 form the output end in DC/DC conversion portion 2, and it is connected with another LED light source B2.In addition, detect winding 25 and inductor 22 magnetic coupling, the first end detecting winding 25 is grounded, and the second end detecting winding 25 is connected with the anode of diode 26.And the negative electrode of diode 26 is connected with abnormity detection portion 3.
In the example in fig 1, control part D is made up of first control circuit 10 and second control circuit 20.First control circuit 10 is after connecting switch element 11, and switch element 11 just disconnects by the peak value reaching regulation once the electric current (inductor current) flowing through switch element 11 via inductor 12.When switch element 11 disconnects, the magnetic energy be accumulated in inductor 12 is released, and is charged smmothing capacitor 14 via diode 13.Then, when flowing to the regenerative current vanishing of smmothing capacitor 14 from inductor 12, switch element 11 is connected by first control circuit 10 again.By carrying out switch control rule by first control circuit 10 pairs of switch elements 11 like this, the direct voltage inputted can be depressurized to the direct voltage required for the first LED light source B1 from ac/dc transformation component 4.
Similarly, second control circuit 20 is after connecting switch element 21, and switch element 21 just disconnects by the peak value reaching regulation once the electric current (inductor current) flowing through switch element 21 via inductor 22.When switch element 21 disconnects, the magnetic energy be accumulated in inductor 22 is released, and is charged smmothing capacitor 24 via diode 23.Then, when flowing to the regenerative current vanishing of smmothing capacitor 24 from inductor 22, switch element 21 is connected by second control circuit 20 again.By carrying out switch control rule by second control circuit 20 pairs of switch elements 21 like this, the direct voltage inputted can be depressurized to the direct voltage required for the second LED light source B2 from ac/dc transformation component 4.
Wherein, above-mentioned first control circuit 10 and the control action of second control circuit 20 are called as critical conduction mode, but its purport is not be defined in this.Namely, switch element 11,21 is connected (continuous mode) by the moment that the first and second control circuits 10,20 also can reach higher than the lower limit of zero at regenerative current, or also after regenerative current vanishing, switch element 11,21 can be connected (discontinuous mode).
Light adjusting circuit portion 6 is configured to read dimming level from the dim signal from outside input, the dimming level read out is supplied to first control circuit 10 and second control circuit 20.First control circuit 10 and second control circuit 20 correspondingly change with the dimming level provided from light adjusting circuit portion 6 peak value compared with inductor current.Then, by peak change, increase or reduce the direct current power (amount of power supply) supplied to the first LED light source B1 and the second LED light source B2, thus the light output of the first LED light source B1 and the second LED light source B2 is adjusted (light modulation).Wherein, as the light-dimming method in light adjusting circuit portion 6, also can use and with stop the ratio that supply electric current during change dimming level, so-called pulse light modulation (バ ー ス ト Tone light from DC/DC conversion portion 1,2 to LED light source B1, B2 during supply electric current by changing).Can also by above-mentioned two kinds of light-dimming methods combination.
Abnormity detection portion 3 is configured to the exception detecting multiple LED light source respectively.In the example in fig 1, abnormity detection portion 3 is configured to the exception detecting the first LED light source B1 and the second LED light source B2 respectively.Such as, abnormity detection portion 3 is made up of comparator, microcomputer.And abnormity detection portion 3 is configured to the exception (short circuit or non-loaded) detecting the first LED light source B1 and the second LED light source B2 according to the detection voltage detecting generation in winding 15,25 respectively.Such as, when detecting the exception of a part (being the side in the first LED light source B1 and the second LED light source B2 in the example in fig 1) of multiple LED light source, abnormity detection portion 3 is to the control circuit 10 or 20 output abnormality detection signal corresponding with this part.
Fig. 2 illustrates the physical circuit example of abnormity detection portion 3.In addition, in fig. 2, illustrate only the circuit structure that the detection voltage (first detects voltage) that produces in the detection winding 15 with DC/DC conversion portion 1 is corresponding, about the circuit structure corresponding with the detection voltage (second detects voltage) produced in the detection winding 25 in DC/DC conversion portion 2 (except microcomputer 30.), omit diagram.Wherein, that detects illustrated in circuit structure corresponding to voltage and Fig. 2 with second is identical with the circuit structure that first detects voltage corresponding.
Detect voltage (first detect voltage and second detect voltage) be is zero during the connection of switch element 11,21, be the voltage signal of the square wave of high level at the off period of switch element 11,21, the output voltage in voltage during high level and DC/DC conversion portion 1,2 has dependency relation.Thus, when LED light source B1, B2 there occurs short trouble, the output voltage in DC/DC conversion portion 1,2 is almost nil, and therefore detection voltage is also the voltage close to zero.On the other hand, when the distribution of the connection due to LED light source B1, B2 and DC/DC conversion portion 1,2 not exclusively or in LED light source B1, B2 disconnects and becomes no-load condition, the output voltage in DC/DC conversion portion 1,2 and input voltage (output voltage of ac/dc transformation component 4) roughly equal.Therefore, voltage is detected higher than voltage time normal.
In the example in figure 2, in abnormity detection portion 3, after the radio-frequency component comprised in the first detection voltage being removed by the low pass filter by being made up of resistance R1 and capacitor C1, detecting voltage by divider resistance R2, R3 to first and carrying out dividing potential drop.Detect voltage with first after dividing potential drop to charge to capacitor C2, the both end voltage of capacitor C2 is imported into the input port of microcomputer 30.Microcomputer 30 detects after voltage (first after dividing potential drop detects voltage) carries out A/D conversion be input to input port first and compares with large threshold value and these two threshold values of little threshold value.
Then, if detect voltage to first to carry out A/D and convert the value that obtains lower than little threshold value (hereinafter referred to as " the first lower limit ") or higher than large threshold value (hereinafter referred to as " the first higher limit "), then expression first LED light source B1 is created the first abnormal anomaly detection signal and outputs to the first and second control circuits 10,20 respectively by microcomputer 30.In addition, the first lower limit be set to than time normal first detect voltage fully little and be greater than zero value.In addition, the first higher limit be set to than first time normal detect voltage fully large and equal input voltage than the output voltage in hypothesis DC/DC conversion portion 1,2 time first and second detect the little value of voltages.Similarly, abnormity detection portion 3 is carried out A/D convert the value and large threshold value that obtain and these two threshold values of little threshold value compare by being detected voltage to be input to another input port second.Then, if detect voltage to second to carry out A/D and convert the value that obtains lower than little threshold value (the second lower limit) or higher than large threshold value (the second higher limit), then expression second LED light source B2 is created the second abnormal anomaly detection signal and outputs to the first and second control circuits 10,20 respectively by microcomputer 30.
Control part D is configured to when abnormity detection portion 3 detects the exception of a part for multiple LED light source, and the control carrying out adjustment part C stops to the output of this part to make adjustment part C, and adjustment part C is increased to the output of the remainder of multiple LED light source.In the example in fig 1, DC/DC conversion portion 1, when being transfused to the first anomaly detection signal, is stopped by the switch motion of shutdown switch element 11 by first control circuit 10.That is, first control circuit 10 makes adjustment part C stop to the output of the first LED light source B1 of the part as above-mentioned multiple LED light source.DC/DC conversion portion 2, when being transfused to the second anomaly detection signal, is stopped by the switch motion of shutdown switch element 21 by second control circuit 20.That is, second control circuit 20 makes adjustment part C stop to the output of the second LED light source B2 of the part as above-mentioned multiple LED light source.Its result, stops powering to the side in LED light source B1, B2 of creating exception (short circuit or non-loaded), can realize respectively the protection in DC/DC conversion portion 1,2, output voltage exception rise suppression.
And, first control circuit 10 is not when being transfused to the first anomaly detection signal and be transfused to the second anomaly detection signal, by making the peak value of the regulation disconnected by switch element 11,21 higher than time normal, make to increase from DC/DC conversion portion 1 to the direct current power (amount of power supply) of the first LED light source B1.In other words, first control circuit 10 makes adjustment part C increase to the output of the first LED light source B1 of the remainder as above-mentioned multiple LED light source.Its result, the light output (light quantity) of the first LED light source B1 increases, therefore, it is possible to suppress the illumination when the second LED light source B2 extinguishes to decline.
Similarly, second control circuit 20, when not being transfused to the second anomaly detection signal and be transfused to the first anomaly detection signal, by making peak value higher than time normal, makes to increase from DC/DC conversion portion 2 to the direct current power of the second LED light source B2.In other words, second control circuit 20 makes adjustment part C increase to the output of the second LED light source B2 of the remainder as above-mentioned multiple LED light source.Its result, the light output of the second LED light source B2 increases, therefore, it is possible to suppress the illumination when the first LED light source B1 extinguishes to decline.
As mentioned above, the LED drive device A1 of present embodiment is configured to, by input electric power being transformed to direct current power (direct current power of expectation) and this direct current power being supplied to multiple LED light source B1, B2 side, drive multiple LED light source B1, B2.And the LED drive device A1 of present embodiment possesses: abnormity detection portion 3, consist of the exception detecting multiple LED light source B1, B2 respectively; And adjustment part C (DC/DC conversion portion 1 and DC/DC conversion portion 2), consisting of adjustment respectively will to the direct current power of multiple LED light source B1, B2 sides supply, using this direct current power after adjustment respectively as to multiple LED light source B1, B2 output separately.Further, the LED drive device A1 of present embodiment possesses control part D (first control circuit 10 and second control circuit 20).Control part D is configured to when abnormity detection portion 3 detects the exception of a part of multiple LED light source B1, B2, the control carrying out adjustment part C (DC/DC conversion portion 1,2) stops to the output of this part to make adjustment part C, and adjustment part C is increased to the output of the remainder of multiple LED light source B1, B2.
Thus, first control circuit 10 and second control circuit 20 carry out the control of adjustment part C to make not detect that the output of the remainder of abnormal above-mentioned multiple LED light source B1, B2 increases to abnormity detection portion 3, therefore, it is possible to suppress illumination during abnormal generation to decline.Wherein, preferably, if first control circuit 10 and second control circuit 20 are no longer transfused to the first anomaly detection signal and the second anomaly detection signal, then restart the switch motion of a part for the switch element 11,21 stopped, and make peak value revert to original value (value before being transfused to anomaly detection signal).In addition, preferably, the output of the remainder of the switch element 11,21 that output is increased is reverted to original value by first control circuit 10 and second control circuit 20.Thereby, it is possible to malfunction when avoiding eliminating in replacing by LED light source B1, B2 etc. exception (short circuit, non-loaded).
In addition, in the LED drive device A1 of present embodiment, preferably possess ac/dc transformation component 4, this ac/dc transformation component 4 is configured to the alternating electromotive force as above-mentioned input electric power to be transformed to direct current power.Further, preferably, adjustment part C possesses multiple DC/DC conversion portion 1,2, and the plurality of DC/DC conversion portion 1,2 is connected in parallel in the output end of ac/dc transformation component 4.Preferably, multiple LED light source (first and second LED light source B1, B2) is one by one connected with the output end in multiple DC/DC conversion portion 1,2.Preferably, multiple DC/DC conversion portion 1,2 is configured to the direct current power from interchange/DC converting portion 4 to be transformed to the direct current power corresponding with the control of control part D respectively.As long as such structure, just an ac/dc transformation component 4 can be shared, therefore, it is possible to the simplification of realizing circuit structure by multiple DC/DC conversion portion 1,2.
As other execution mode of the present invention, also can be as follows: LED drive device A2 possesses multiple ac/dc transformation component 4A, 4B as shown in Figure 3, the plurality of ac/dc transformation component 4A, 4B are configured to the alternating electromotive force as above-mentioned input electric power to be transformed to direct current power respectively.And, preferably, multiple DC/DC conversion portion 1,2 is one by one connected with multiple output end of multiple ac/dc transformation component 4A, 4B, and multiple LED light source (first and second LED light source B1, B2) is one by one connected with multiple output end in multiple DC/DC conversion portion 1,2.In the example in figure 3, multiple DC/DC conversion portion 1,2 is configured to each direct current power from multiple ac/dc transformation component 4A, 4B to be transformed to the direct current power corresponding with the control of control part D.In addition, also following structure can be set to: as shown in Figure 4, abnormity detection portion 3 is set respectively for two DC/DC conversion portions 1,2, the anomaly detection signal of each abnormity detection portion 3 is outputted to respectively the control circuit 10,20 in two DC/DC conversion portions 1,2.
In addition, preferably, control part D (the first and second control circuits 10,20) is when the control carrying out adjustment part C (DC/DC conversion portion 1,2) makes adjustment part C lower than multiple LED light source rated value separately (rated electrical value) to the value of the output of multiple LED light source (first and second LED light source B1, B2), when abnormity detection portion 3 detects the exception of a part for multiple LED light source, stop adjustment part C to the output of this part.Such as, rated value corresponds to the power value to LED light source (rated electrical value) when the light output of LED light source becomes 100%.Further, preferably, control part D carries out the control of adjustment part C to make adjustment part C to the value of the output of multiple LED light source (first and second LED light source B1, B2) close to above-mentioned rated value.
Such as, in the A of Fig. 5 shown in dotted line α, assuming that control part D (first control circuit 10 and second control circuit 20) adjusts the output in (minimizing) adjustment part C (DC/DC conversion portion 1 and DC/DC conversion portion 2) by initial illuminance correction.Then, when the first LED light source B1 there occurs abnormal, first control circuit 10 makes DC/DC conversion portion 1 stop.On the other hand, preferably, if the second LED light source B2 is normal, then second control circuit 20 stops initial illuminance correction and the output in DC/DC conversion portion 2 is increased as shown in solid line β in the A of Fig. 5, makes the light output of the second LED light source B2 close to rated value (100%).Or the output that second control circuit 20 also can increase DC/DC conversion portion 2 as shown in solid line γ in the B of Fig. 5 makes the light output of the second LED light source B2 be rated value (100%).That is, control part C also can be configured to carry out the control of adjustment part C to make adjustment part C consistent with above-mentioned rated value to the value of the output of the remainder of multiple LED light source.Control when like this light output being set to rated value with first control circuit 10 and second control circuit 20 becomes easy advantage.
As other control example, also can when low light modulation (such as dimming level less than 50%), carry out controlling to make light output and original lightness roughly equal (when detecting the exception of a LED light source when the number of multiple LED light source is 2, the light output of another normal LED light source being increased to the light output of 2 times) as shown in solid line β in the C of Fig. 5.In detail, control part D when the control carrying out adjustment part C make adjustment part C to the value (with light output level) of the output of first and second LED light source B1, B2 mutually the same and lower than first and second LED light source B1, B2 rated value separately, if first and second LED light source B1, B2 dimming level separately (light output level) is less than 50%, then this dimming level (light output level) can be increased to 2 times.Therefore, control part D also can be configured to when the control carrying out adjustment part C make adjustment part C to the value of the output of first and second LED light source B1, B2 mutually the same and lower than first and second LED light source B1, B2 rated value separately, when abnormity detection portion 3 detects the exception of the side in first and second LED light source B1, B2, adjustment part C is stopped to the output of this side.In this case, the control that control part D is configured to carry out adjustment part C becomes the value (β with reference to the C of Fig. 5) of 2 times of this output to make adjustment part C to the value (α with reference to the C of Fig. 5) of the output of the opposing party in first and second LED light source B1, B2 or makes when this value of 2 times exceedes above-mentioned rated value the value of this output become this rated value (β with reference to the C of Fig. 5).
In addition, the LED drive device A1 of present embodiment, A2 are configured to drive (lighting) first and second LED light source B1, B2, but also the LED light source that can be configured to more than three drives.In addition, multiple LED light source B1, B2 that the LED drive device A1 of present embodiment, A2 drive need not be the LED light source of identical (rated voltage is identical with rated current), can be the LED light sources that rated voltage is different with at least one party of rated current.
In addition, when only having a DC/DC conversion portion 1 or 2 to carry out action when exception, compared with when carrying out action normal with two DC/DC conversion portions 1,2, the output voltage of ac/dc transformation component 4 is underload, and the possibility therefore risen is high.In addition, becoming in underloaded situation, the output voltage of ac/dc transformation component 4 produces fluctuation, and the electric current flowing through LED light source B1 or B2 due to the impact of this fluctuation produces variation, thus likely produces flicker.
But, in the LED drive device A1, A2 of present embodiment, increase owing to making the output of the DC/DC conversion portion 1 or 2 of the side proceeding action, the i.e. remainder of above-mentioned multiple LED light source, therefore, compared with the situation not making output increase, the rising of the output voltage of ac/dc transformation component 4 and the generation of fluctuation can be suppressed.
In addition, switch element 11,21 is set to the circuit structure of hot side (high-pressure side) (wherein by DC/DC conversion portion 1,2, illustrate only DC/DC conversion portion 1 in figure 6, omit the diagram in DC/DC conversion portion 2).
The B of A and Fig. 7 of Fig. 7 represents the execution mode of ligthing paraphernalia involved in the present invention.The ligthing paraphernalia 7 of present embodiment, in middle uses such as street lamps, possesses the appliance body 70 installed on the top of the pillar P being erected on ground.
Appliance body 70 is formed as flat rectangular box by aluminium diecasting, is accommodated with the first LED light source B1 and the second LED light source B2 in inside.Light from LED light source B1, B2, forming the fenestra 71 of rectangle with first and second LED light source B1, B2 lower surface opening in opposite directions, is radiated downwards by this fenestra 71 by appliance body 70.Wherein, fenestra 71 is reinforced transparent panel 72 obturation of glass.
In addition, in appliance body 70, also LED drive device A1 is accommodated with.LED drive device A1 is supplied to alternating voltage/alternating current via the power line (not shown) of the inside being laid in pole P from AC power E.
In addition, ligthing paraphernalia involved in the present invention is not limited to street lamp, such as, also can be the ligthing paraphernalia etc. to tunnel internal illumination.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-152956 | 2013-07-23 | ||
| JP2013152956A JP6167455B2 (en) | 2013-07-23 | 2013-07-23 | LED driving device and lighting apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN104349544A true CN104349544A (en) | 2015-02-11 |
| CN104349544B CN104349544B (en) | 2017-09-05 |
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| CN201410350686.7A Expired - Fee Related CN104349544B (en) | 2013-07-23 | 2014-07-22 | LED drive device and ligthing paraphernalia |
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| JP (1) | JP6167455B2 (en) |
| CN (1) | CN104349544B (en) |
Cited By (1)
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|---|---|---|---|---|
| TWI666969B (en) * | 2017-01-06 | 2019-07-21 | 日商東芝照明技術股份有限公司 | Power supply device and lighting device provided with the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102118623B1 (en) * | 2017-07-31 | 2020-06-03 | 주식회사 루닉스 | Flicker Prevention LED Lightening Device |
| CN113840428B (en) * | 2021-09-28 | 2023-12-08 | 厦门普为光电科技有限公司 | Multi-light source lighting system and control method thereof |
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| CN201557308U (en) * | 2009-10-29 | 2010-08-18 | 新巨企业股份有限公司 | LED lamp group monitoring circuit |
| CN201682666U (en) * | 2010-04-28 | 2010-12-22 | 优源科技股份有限公司 | Driver of adjustable light-emitting diode |
| CN101945513A (en) * | 2009-07-08 | 2011-01-12 | 连营科技股份有限公司 | Light emitting diode device with compensation mechanism |
| JP2011154841A (en) * | 2010-01-26 | 2011-08-11 | Panasonic Electric Works Co Ltd | Led lighting device, lighting fixture, and vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4776463B2 (en) * | 2006-07-20 | 2011-09-21 | シャープ株式会社 | Surface light source device, illumination device, backlight device, and display device |
| JP5132749B2 (en) * | 2010-10-07 | 2013-01-30 | 三菱電機株式会社 | Light source lighting device and lighting fixture |
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2013
- 2013-07-23 JP JP2013152956A patent/JP6167455B2/en active Active
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101945513A (en) * | 2009-07-08 | 2011-01-12 | 连营科技股份有限公司 | Light emitting diode device with compensation mechanism |
| CN201557308U (en) * | 2009-10-29 | 2010-08-18 | 新巨企业股份有限公司 | LED lamp group monitoring circuit |
| JP2011154841A (en) * | 2010-01-26 | 2011-08-11 | Panasonic Electric Works Co Ltd | Led lighting device, lighting fixture, and vehicle |
| CN201682666U (en) * | 2010-04-28 | 2010-12-22 | 优源科技股份有限公司 | Driver of adjustable light-emitting diode |
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| TWI666969B (en) * | 2017-01-06 | 2019-07-21 | 日商東芝照明技術股份有限公司 | Power supply device and lighting device provided with the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6167455B2 (en) | 2017-07-26 |
| JP2015023002A (en) | 2015-02-02 |
| CN104349544B (en) | 2017-09-05 |
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