CN103458565B - LED drive device and ligthing paraphernalia - Google Patents
LED drive device and ligthing paraphernalia Download PDFInfo
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- CN103458565B CN103458565B CN201310208284.9A CN201310208284A CN103458565B CN 103458565 B CN103458565 B CN 103458565B CN 201310208284 A CN201310208284 A CN 201310208284A CN 103458565 B CN103458565 B CN 103458565B
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention provides the LED drive device suitably can carrying out the detection of the abnormality according to dimming state.LED drive device (1) is arranged at ligthing paraphernalia (100), carrys out the LED module (10) that driving LED unit (10a, 10b) is formed by connecting in parallel.LED drive device (1) have by drive electric power export to LED module (10) DC/DC transducer (2), export with in the current detection circuit (3) of detection voltage (VL) corresponding to the middle electric current (Ia, Ib) flowed of LED module (10) and control circuit portion (4).LED drive device (1) carries out light modulation action according to the light modulation index signal (Sad) be transfused to LED module.Control circuit portion obtains the threshold voltage corresponding with light modulation index signal.Control circuit portion compares the threshold voltage detecting voltage and obtain, and detects the abnormality of LED module according to comparative result.
Description
Technical field
The present invention relates to LED drive device and ligthing paraphernalia, particularly relate to LED drive device and the ligthing paraphernalia that can carry out the light modulation of LED module.
Background technology
In recent years, in ligthing paraphernalia etc., the LED module multiple LED unit be formed by connecting in parallel uses as light source, and this LED unit is by LED(light-emitting diode) connect in the mode of connecting.As the LED drive device being used in such ligthing paraphernalia etc., having when there is the abnormality of flow abnormalities electric current in LED etc., according to its state, carrying out the LED drive device of the drived control such as the cut-out of electric current.
At following patent documentation 1, disclose the formation of the LED drive circuit being arranged on the lighting device possessing LED group.The body that is connected in series being connected to multiple LED in the mode of series connection is connected into multiple row and is formed by LED group in parallel.In this LED drive circuit, when any one flow abnormalities electric current be connected in series in body of multiple row, cut off the electric current being connected in series body of flow abnormalities electric current.In addition, in this LED drive circuit, when the output voltage to LED group's supply becomes overvoltage, cut off the electric current being connected in series whole row of body.
Patent documentation 1: Japanese Unexamined Patent Publication 2009-252344 publication
Above-mentioned LED drive device is configured to, and when there is abnormality, by using the control circuit of the closed loop corresponding with the kind of the exception occurred, in LED drive device, carries out protection act.But, in the formation of above-mentioned LED drive device, existing when carrying out brightness adjustment control, can not detect in the inside of LED drive device whether abnormal such problem occurs reality exactly.
That is, in above-mentioned LED drive device, if multiple LED short circuit or disconnection in a LED unit, then even at the current unevenness that each LED unit flows.Therefore, the driving voltage of each LED unit reduces, until average out between each LED unit.
Here, if LED module modulated light, then the forward voltage VF(forward voltage of LED) variation.In other words, the driving voltage of LED module changes according to dimming state.Therefore, in the detection method of the abnormality utilizing above-mentioned LED drive device to perform, even if when multiple LED becomes short-circuit condition or off-state in a LED unit, also not easily it can be used as exception and detect.
Summary of the invention
The present invention makes to solve such problem points, and its object is to provides LED drive device and the ligthing paraphernalia that suitably can carry out the detection of the abnormality according to dimming state.
To achieve these goals, according to certain aspect of the present invention, according to light modulation index signal to LED(light-emitting diode) the module LED drive device of carrying out light modulation action possesses: drive circuit portion, it exports driving electric power to LED module, current detection circuit, it is connected to LED module, and detect the electric current flowed in LED module, export the detection voltage corresponding with testing result, and control circuit portion, it compares the detection voltage exported from current detection circuit and the threshold voltage corresponding with light modulation index signal, and the abnormality of LED module is detected according to this comparative result.
The LED module that LED drive device can be formed by connecting in parallel to multiple LED unit carries out light modulation action, LED unit is formed by connecting in the mode of series connection by more than one LED, and the operation voltage of each LED unit becomes by above-mentioned control circuit portion not to be detected as abnormality at the abnormal voltage of prescribed limit.
Control circuit portion also can have light modulation table storage part, and it prestores the dimming ratio information corresponding with each signal in multiple light modulation index signal; Threshold voltage table storage part, it prestores the information about the threshold voltage corresponding with each signal in multiple light modulation index signal; Dimming ratio obtaining section, it obtains the dimming ratio information corresponding with light modulation index signal based on the information that light modulation table storage part stores; Threshold voltage obtaining section, its information stored based on threshold voltage table storage part obtains the threshold voltage corresponding with light modulation index signal; Information generated efferent, its dimming ratio information obtained based on dimming ratio obtaining section carrys out output pwm signal information generated; PWM signal generation section, its pwm signal information generated exported based on information generated efferent generates PWM dim signal, and exports the PWM dim signal of generation to drive circuit portion; And abnormity detection portion, its threshold voltage obtained threshold voltage obtaining section and comparing from the detection voltage that current detection circuit is transfused to, detects the abnormality of LED module according to this comparative result.
Control circuit portion can also have light modulation table storage part, and it prestores the dimming ratio information corresponding with each signal in multiple light modulation index signal; Dimming ratio obtaining section, it obtains the dimming ratio information corresponding with light modulation index signal based on the information that light modulation table storage part stores; Information generated efferent, its dimming ratio information obtained based on dimming ratio obtaining section carrys out output pwm signal information generated; PWM signal generation section, its pwm signal information generated exported based on information generated efferent generates PWM dim signal, and exports the PWM dim signal of generation to drive circuit portion; Threshold voltage calculating part, its dimming ratio information obtained based on dimming ratio obtaining section and light modulation index signal, calculate the threshold voltage corresponding with light modulation index signal; And abnormity detection portion, its threshold voltage calculated threshold voltage calculating part and comparing from the detection voltage that current detection circuit is transfused to, detects the abnormality of LED module according to this comparative result.
Control circuit portion can also stop controlling when detecting the abnormality of LED module drive circuit portion or the electric power reduced to LED module supplies.
Control circuit portion can also have: decision signal efferent, and it is when abnormity detection portion detects the abnormality of LED module, output error decision signal; And rub-out signal generating unit, rub-out signal, when being transfused to wrong decision signal from decision signal efferent, is exported to drive circuit portion by it.
According to other aspect of invention, ligthing paraphernalia possesses: the LED module that multiple LED unit is formed by connecting in parallel, and LED unit is formed by connecting in the mode of series connection by more than one LED; The above-mentioned LED drive device of driving LED module; And light modulation index signal is exported to the light adjusting and controlling device of LED drive device.
According to these inventions, control circuit portion compares the detection voltage and the threshold voltage corresponding with light modulation index signal that export from current detection circuit, and detects the abnormality of LED module according to this comparative result.Therefore, it is possible to provide LED drive device and the ligthing paraphernalia that suitably can carry out the detection of the abnormality according to dimming state.
Accompanying drawing explanation
Fig. 1 is the block diagram of the formation of the ligthing paraphernalia representing the LED drive device using the 1st execution mode of the present invention.
Fig. 2 is the block diagram of the formation representing LED drive device and LED module.
Fig. 3 is the flow chart of the order of the process action of the operational part that LED drive device is described.
Fig. 4 is the block diagram representing the LED drive device of the 2nd execution mode of the present invention and the formation of LED module.
Fig. 5 is the flow chart of the order of the process action of the operational part of the LED drive device that the 2nd execution mode is described.
The explanation of Reference numeral
1,101LED drive unit; 2DC/DC transducer (example in drive circuit portion); 3 current detection circuits; 4,104 control circuit portions; 10LED module; 10a, 10bLED unit; 20 light adjusting and controlling devices; 41 light modulation table storage parts; 42 operational parts (decision signal efferent, dimming ratio obtaining section, threshold voltage obtaining section, information generated efferent, abnormity detection portion, an example of threshold voltage calculating part); 43PWM signal generating unit; 44 threshold voltage table storage parts; 45A-D converter section; 46 rub-out signal generating units; 100 ligthing paraphernalias; 147 threshold voltage reservoir; Sad light modulation index signal; Sa dimming ratio information; Ss threshold voltage information; SpPWM signal information generated; ScPWM dim signal; Sj mistake decision signal; Se rub-out signal; Sf feedback signal; VL detects voltage; Vd(detects voltage) digital signal.
Embodiment
Below, the ligthing paraphernalia of the LED drive device using embodiments of the present invention is described.
［ the 1st execution mode ］
Fig. 1 is the block diagram of the formation of the ligthing paraphernalia of the LED drive device using the 1st execution mode of the present invention.
As shown in Figure 1, ligthing paraphernalia 100 possesses LED drive device 1, LED module 10 and light adjusting and controlling device 20.Ligthing paraphernalia 100 is lighted by driving by LED module 10 and throws light on.
LED drive device 1 is connected with LED module 10.LED drive device 1 driving LED module 10.
In the present embodiment, LED drive device 1 is connected with light adjusting and controlling device 20.Light adjusting and controlling device 20 pairs of LED drive device 1 export light modulation index signal Sad.The light modulation index signal Sad that LED drive device 1 is sent here based on the light adjusting and controlling device 20 from its outside, carries out light modulation action to LED module 10.That is, in lighting device 100, the brightness of the illumination employing LED module 10 can be changed.
Light modulation index signal Sad is such as digital signal.
Light adjusting and controlling device 20 is such as the remote controller being located at ligthing paraphernalia 100 in order to change brightness.The connection of light adjusting and controlling device 20 and LED drive device 1 can be wired, also can be wireless.When such as by wireless connections light adjusting and controlling device 20 and LED drive device 1, also can be configured to arrange illuminating part at light adjusting and controlling device 20, light accepting part is set in LED drive device 1, carry out infrared communication between.
Fig. 2 is the block diagram of the formation representing LED drive device 1 and LED module 10.
As shown in Figure 2, in the present embodiment, LED module 10 has the LED unit 10a, the 10b that are formed by connecting in the mode of series connection by multiple LED.LED module 10 is that LED unit 10a is connected in parallel with LED unit 10b and forms.
Be not limited to be provided with two LED unit 10a, 10b at LED module 10, also can be provided with more LED unit.Such as, also can be LED unit 10a, the 10b of more than three ... mutually connect in parallel and form LED module 10.LED unit 10a, 10b are not limited to have multiple LED, also can have a LED.Such as, LED module 10 also can be made up of the multiple LED mutually connected in parallel in units of.
LED drive device 1 has DC/DC transducer (example in drive circuit portion) 2, current detection circuit 3 and control circuit portion 4.LED module 10 is connected with DC/DC transducer 2 and current detection circuit 3.Light modulation index signal Sad is input to control circuit portion 4.That is, control circuit portion 4 is connected with light adjusting and controlling device 20.
DC/DC transducer 2 is connected with DC power supply Vcc.DC/DC transducer 2 exports to LED module 10 and drives electric power.Here, the PWM dim signal Sc exported from control circuit portion 4 is input to DC/DC transducer 2.DC/DC transducer 2, based on the PWM dim signal Sc be transfused to, makes the driving electric power variation exporting LED module 10 to carry out light modulation action to LED module 10.In addition, the rub-out signal Se exported from control circuit portion 4 when there is abnormality as described later in LED module 10 is input to DC/DC transducer 2.Such as, LED unit 10a and LED unit 10b both sides or wherein any one party becomes off-state or short-circuit condition time, from control circuit portion 4 output error signal Se.DC/DC transducer 2, based on rub-out signal Se, changes and exports to LED module 10 action driving electric power.Such as, DC/DC transducer 2, when being admitted to rub-out signal Se, stops exporting to LED module 10 action driving electric power.
Current detection circuit 3 is connected with LED module 10.Current detection circuit 3 detects the electric current of flowing in LED module 10, exports the detection voltage corresponding with its testing result.That is, current detection circuit 3 detects the electric current I a, the Ib that flow in LED unit 10a, 10b as magnitude of voltage, output detections voltage VL.Detect voltage VL and be input to control circuit portion 4.
Current detection circuit 3 comprises the resistance R1 be connected with the cathode side terminal of LED unit 10a and the resistance R2 be connected with the cathode side terminal of LED unit 10b.Resistance R1 and resistance R2 are by not being connected at connecting portion each other with the terminal of LED unit 10a, 10b connection side respectively.The connecting portion of this resistance R1, R2 is connected with earthing potential across resistance R0, and in addition, the connecting portion of resistance R1, R2 is connected with DC/DC transducer 2.The electric current of flowing LED module 10 is sent as feedback signal Sf from the connecting portion of resistance R1, R2 to DC/DC transducer 2.DC/DC transducer 2, based on feedback signal Sf, carries out the FEEDBACK CONTROL of the driving electric power of LED module 10.
Current detection circuit 3 comprises two diodes D1, D2.The anode-side connecting terminals of diode D1 is connected between the cathode side terminal of LED unit 10a and resistance R1.The anode-side connecting terminals of diode D2 is connected between the cathode side terminal of LED unit 10b and resistance R2.The cathode side terminal of diode D1, D2 is interconnected, and is connected with control circuit portion 4.Current detection circuit 3 exports the detection voltage VL corresponding with the electric current I a, the Ib that flow in LED unit 10a, 10b via diode D1, D2.
Control circuit portion 4 is such as microcomputer.Control circuit portion 4 compares the detection voltage VL exported from current detection circuit 3 and the threshold voltage corresponding with light modulation index signal Sad, detects the abnormality of LED module 10 according to this comparative result.The situation that the operation voltage of each LED unit 10a, 10b is become the abnormal voltage not in prescribed limit by control circuit portion 4 detects as abnormality.It is noted that, in the following description, when detecting voltage VL and being larger than threshold voltage, detect the abnormality of LED module 10.These action cases are the control program that puts rules into practice of control circuit portion 4 in this way, thus carries out in control circuit portion 4.
As shown in Figure 2, control circuit portion 4 has light modulation table storage part 41, an operational part (example of decision signal efferent, an example of dimming ratio obtaining section, an example of threshold voltage obtaining section, an example of information generated efferent a, example of abnormity detection portion) 42, PWM signal generation section 43, threshold voltage table storage part 44, A-D converter section 45 and rub-out signal generating unit 46.
Light modulation table storage part 41 and threshold voltage table storage part 44 are such as the ROM(in control circuit portion 4 can be such as flash memory or EEPROM etc.) the part of storage area.
Light modulation table storage part 41 prestores the dimming ratio information Sa corresponding with each signal in multiple light modulation index signal Sad.That is, dimming ratio information Sa is the information that dimming ratio when LED module 10 being driven with LED drive device 1 is corresponding.Dimming ratio information Sa is such as digital signal.The dimming ratio information Sa that multiple light modulation index signal Sad that can be corresponding with ligthing paraphernalia 100 are corresponding is respectively set in advance.In light modulation table storage part 41, each light modulation index signal Sad and the dimming ratio information Sa corresponding with it is established corresponding, and is stored as look-up table.It is noted that the hop count (light modulation hop count) of light modulation that can be corresponding with LED drive device 1 is such as 20 sections.
Threshold voltage table storage part 44 prestores information (threshold voltage information) Ss about the threshold voltage corresponding with each signal in multiple light modulation index signal Sad.Threshold voltage information Ss is such as the digital signal corresponding with each threshold voltage.Threshold voltage information Ss is calculated accordingly in advance with dimming ratio.In threshold voltage table storage part 44, store each light modulation index signal Sad and the threshold voltage information Ss corresponding with it and be established corresponding look-up table.In other words, in present embodiment, in control circuit portion 4, be previously stored with dimming ratio information Sa and threshold voltage information Ss in the mode that each signal in the light modulation index signal Sad of the hop count with tunable optical in LED drive device 1 is corresponding.In addition, threshold voltage information Ss such as according to the LED module 10(becoming the object that LED drive device 1 drives according to LED unit 10a, 10b ... quantity, quantity etc. for the LED of each unit) calculate.
Operational part 42 as described later, obtains the dimming ratio information Sa corresponding with the light modulation index signal Sad be transfused to from light modulation table storage part 41, generates pwm signal information generated Sp and exports PWM signal generation section 43 to.In addition, as described later, generation error decision signal Sj exports rub-out signal generating unit 46 to operational part 42.Pwm signal information generated Sp and wrong decision signal Sj is such as digital signal.
PWM signal generation section 43 is such as that benchmark generates pwm signal with timer.PWM signal generation section 43 generates PWM dim signal Sc based on the pwm signal information generated Sp exported from operational part 42, and the PWM dim signal Sc of generation is exported to DC/DC transducer 2.DC/DC transducer 2, based on the PWM dim signal Sc be output, makes LED module 10 drive.Its result is, based on the light modulation index signal Sad inputing to LED drive device 1, carries out light modulation action to LED module 10.
In A-D converter section 45, namely the analog voltage inputted is detected voltage VL be converted to digital signal Vd from current detection circuit 3.To be converted and the digital signal Vd obtained is sent to operational part 42.
Rub-out signal generating unit 46 be transfused to from operational part 42 export wrong decision signal Sj time, based on this wrong decision signal Sj generation error signal Se.The rub-out signal Se generated is output to DC/DC transducer 2.
Here, operational part 42 is by carrying out following process, thus output pwm signal information generated Sp and wrong decision signal Sj.
That is, operational part 42 is with reference to the look-up table being stored in light modulation table storage part 41, obtains the dimming ratio information Sa(operational part 42 corresponding with the light modulation index signal Sad being input to operational part 42 and plays function as dimming ratio obtaining section).Then, operational part 42, based on the dimming ratio information Sa obtained, generates pwm signal information generated Sp, so that with the dimming ratio driving LED module 10 corresponding with this dimming ratio information Sa.Thus, the pwm signal information generated Sp of generation is output to PWM signal generation section 43(operational part 42 and plays function as information generated efferent).
In addition, operational part 42, with reference to the look-up table be stored in threshold voltage table storage part 44, obtains namely corresponding with the threshold voltage digital signal of the threshold voltage signal Ss corresponding with the light modulation index signal Sad inputing to operational part 42 (operational part 42 plays function as threshold voltage obtaining section).Then, operational part 42 compares the digital signal obtained and the digital signal Vd corresponding with the detection voltage VL inputted from current detection circuit 3.In other words, operational part 42 compares to the threshold voltage corresponding with light modulation index signal Sad with from the detection voltage VL that current detection circuit 3 exports.Operational part 42, according to this comparative result, detects the abnormality (operational part 42 plays function as abnormity detection portion) of LED module 10.The test example of abnormality is as carried out as described below.When the abnormality of LED module 10 is detected, operational part 42 generation error decision signal Sj, and output error signal generating unit 46(operational part 42 plays function as decision signal efferent).
For operational part 42 as above action case as, made the actions such as the control program being stored in operational part 42 by operational part 42, perform as follows.
Fig. 3 is the flow chart of the order of the process action of the operational part 42 that LED drive device 1 is described.
As shown in Figure 3, in step sl, operational part 42 determines whether to be transfused to light modulation index signal Sad.Operational part 42 is (YES) when being transfused to light modulation index signal Sad, carries out the process of step S2.When light modulation index signal Sad is not transfused to (no), operational part 42 carries out the process of step S7.
In step s 2, operational part 42 calculates the coordinate data corresponding with light modulation index signal Sad.Coordinate data is in the respective table of light modulation table storage part 41 and threshold voltage table storage part 44, determine the data of the position of the information corresponding with light modulation index signal Sad.If operational part 42 calculates coordinate data, then carry out the process of step S3 and step S5.
In step s3, operational part 42 accesses light modulation table storage part 41, obtains the dimming ratio information Sa suitable with coordinate data.If operational part 42 obtains dimming ratio information Sa, then carry out the process of step S4.
In step s 4 which, operational part 42 generates pwm signal information generated Sp based on dimming ratio information Sa.Operational part 42 exports the pwm signal information generated Sp of generation to PWM signal generation section 43.If operational part 42 carries out the output of pwm signal information generated Sp, then return the process of step S1.
On the other hand, in step s 5, operational part 42 access thresholds voltmeter storage part 44, obtains the threshold voltage information Ss suitable with coordinate data.If operational part 42 obtains threshold voltage information Ss, then carry out the process of step S6.
In step s 6, operational part 42 upgrades threshold voltage based on threshold voltage information Ss.If renewal threshold voltage, then carry out the process of step S7.
In the step s 7, operational part 42 carries out the digital signal Vd corresponding with detecting voltage VL and whether is greater than comparing of the digital signal corresponding with threshold voltage.That is, operational part 42 compares detection voltage VL and whether is greater than threshold voltage.Operational part 42 is (YES) when being judged as that detection voltage VL is greater than threshold voltage, carries out the process of step S8.Operational part 42, when being judged as that detecting voltage VL is below threshold voltage (no), returns the process of step S1.
In step s 8, wrong decision signal Sj exports to rub-out signal generating unit 46 by operational part 42.If carry out the output of wrong decision signal Sj, then operational part 42 ends process action.
If rub-out signal generating unit 46 accepts the wrong decision signal Sj sent from operational part 42, then generation error signal Se, exports to DC/DC transducer 2.If DC/DC transducer 2 acceptance error signal Se, then the electric power to LED module 10 is stopped to supply.Its result, LED module 10 stops light-emission operation.
As described above, in the present embodiment, select the threshold voltage corresponding with dimming state, use the comparative result of this threshold voltage and detection voltage, judge the abnormality of LED module 10.Therefore, the LED drive device 1 of present embodiment, under any dimming state, according to dimming state, can both suitably carry out the detection of abnormality (generation etc. of disconnection, short circuit), the control action corresponding with abnormality.
In addition, according to the present embodiment, disconnection and the short circuit of the circuit in LED module 10 can suitably be detected, therefore, it is possible to prevent the component temperature in LED module 10 from rising to exceptional value.In addition, by the LED drive device 1 of present embodiment is installed on ligthing paraphernalia 100, the temperature that can prevent ligthing paraphernalia 100 from producing rises to the situation of exceptional value.
In threshold voltage table storage part 44, at random can set the numerical value of the look-up table about threshold voltage.Therefore, determine LED unit 10a, 10b ... the short-circuit detecting quantity of LED, carry out action based on this and stop becoming easy.In other words, according to the short circuit quantity of LED, the action whether carrying out LED module 10 can be determined and stops.Such as, even if can be that a LED becomes short-circuit condition and do not detect it, and, short-circuit condition is become to the LED of more than 2 and detects and the driving of LED module 10 is stopped.
As described above, at random can set the numerical value of the table about threshold voltage, thus determine LED unit 10a, 10b ... disconnection detection quantity, become easy based on this situation of carrying out action stopping.In other words, can according to LED unit 10a, 10b ... disconnection quantity, determine whether carry out action stopping.Such as, though can make LED unit 10a, 10b ... in one become off-state and also it does not detected, and, detect LED unit 10a, 10b ... in more than 2 become off-state, the driving of LED module 10 is stopped.
Control circuit portion 4 uses microcomputer to form.Therefore, it is possible to easily rewrite the control program (software) performed by control circuit 4.
［ the 2nd execution mode ］
Use the basic comprising of the ligthing paraphernalia of the LED drive device of the 2nd execution mode identical with the ligthing paraphernalia of the 1st execution mode, therefore not repeat specification here.In the 2nd execution mode, in the control circuit portion of LED drive device, replace threshold voltage table storage part and to be provided with the point of threshold voltage reservoir different from the 1st execution mode.
Fig. 4 is the block diagram representing the LED drive device of the 2nd execution mode of the present invention and the formation of LED module.
As shown in Figure 4, the LED drive device 101 of the 2nd execution mode possesses the DC/DC transducer 2 identical with the 1st above-mentioned execution mode and current detection circuit 3 and forms slightly different control circuit portion 104 with the 1st execution mode.Control circuit portion 104 does not possess threshold voltage table storage part 44, and alternatively has threshold voltage reservoir 147.Other formations in control circuit portion 104 are identical with the formation in the control circuit portion 4 of the 1st execution mode.
In the 2nd execution mode, threshold voltage information Ss is based on the dimming ratio information Sa that obtains in operational part 42 and is input to that the light modulation index signal Sad in control circuit portion 104 calculates.As undertaken by operational part 42, (operational part 42 plays function as threshold voltage calculating part to the calculated example of threshold voltage information Ss.）。The threshold voltage information Ss calculated is stored in threshold voltage reservoir 147.
Fig. 5 is the flow chart of the order of the process action of the operational part 42 of the LED drive device 101 that the 2nd execution mode is described.
As shown in Figure 5, carry out in the same manner as the process of the process till step S11 ~ S14 till the step S1 ~ S4 of the 1st execution mode.That is, operational part 42 obtains dimming ratio information Sa based on light modulation index signal Sad by light modulation table storage part 41, exports the pwm signal information generated Sp corresponding with the dimming ratio information Sa obtained to PWM signal generation section 43.
Here, in the 2nd execution mode, after the process of step S12, the process of step S13 is carried out.After the process of step S13, carry out the process of step S14 and step S15.
In step S15, operational part 42 is based on the dimming ratio information Sa obtained in step s 13 and the light modulation index signal Sad being input to control circuit portion 104, calculated threshold information of voltage Ss.That is, operational part 42 calculates the threshold voltage corresponding with light modulation index signal Sad.The threshold voltage information Ss calculated is stored in threshold voltage reservoir 147 by operational part 42.If store threshold voltage information Ss, then operational part 42 carries out the process of step S16.
In step s 16, operational part 42, based on the threshold voltage information Ss be stored in threshold voltage reservoir 147, upgrades threshold voltage.If renewal threshold voltage, operational part 42 carries out the process of step S17.
The process of step S17, S18 is carried out in the same manner as the process of the step S7 of the 1st execution mode, S8.That is, operational part 42 compares detection voltage VL and whether is greater than threshold voltage, if it is large to detect voltage VL, then exports wrong decision signal Sj to rub-out signal generating unit 46.If detecting voltage VL is below threshold voltage, then operational part 42 returns the process of step S1.
In the 2nd execution mode, also compare the threshold voltage corresponding with dimming state and detect voltage VL, judging the abnormality of LED module 10.Therefore, the effect identical with the 1st execution mode is obtained.
［ other ］
In above-mentioned execution mode, describe when abnormality occurs LED module 10, from control circuit portion 4(104) send rub-out signal Se to DC/DC transducer 2, if DC/DC transducer 2 acceptance error signal Se, then stop the formation exporting the action driving electric power to LED module 10.But, when there occurs abnormality, not necessarily the formation stopping exporting to LED module 10 action driving electric power.
Such as, when also can be configured to, in LED module 10, abnormality occurs, DC/DC transducer 2 makes the driving electric power sent to LED module 10 reduce.In this situation, when there is abnormality in LED module 10, operational part 42 is to PWM signal generation section 43 output pwm signal information generated Sp, to generate the PWM dim signal Sc making the electric current of flowing in LED module 10 reduce in PWM signal generation section 43, the PWM dim signal Sc that the electric current of flowing in LED module 10 is reduced is sent to DC/DC transducer 2 by PWM signal generation section 43.DC/DC transducer 2, based on this PWM dim signal Sc, can reduce the driving electric power sent to LED module 10.
In addition, such as, when also can there is abnormality in LED module 10, according to the situation occurred of abnormality, select minimizing to the driving electric power of LED module 10 transmission or stop driving the action of electric power to LED module 10 output and process.In this situation, such as, in the step S7 of Fig. 3, when being judged to be that detection voltage ratio threshold voltage is large, operational part 42 is according to the difference of its voltage, can select to export pwm signal information generated Sp to PWM signal generation section 43, make the PWM dim signal Sc of the electric current of flowing in LED module 10 minimizing to generate in PWM signal generation section 43 or export wrong decision signal Sj to rub-out signal generating unit 46, making to export to LED module 10 the rub-out signal Se driving the action of electric power to stop generating in rub-out signal generating unit 46.
In addition, in the above-described embodiment, show when detecting voltage VL and being greater than threshold voltage, judge that detecting voltage VL is the example of abnormal voltage.But, also can be judged as that the mode of abnormal voltage carrys out set threshold voltage when detecting voltage VL and being less than threshold voltage.In addition, also can set two threshold voltages, when detection voltage VL is not between two threshold voltages, be judged as abnormal voltage.
Also the characteristic point of above-mentioned execution mode can suitably be combined to form LED drive device, ligthing paraphernalia.Such as, threshold voltage table storage part and threshold voltage reservoir can be also provided with.
Each circuit of LED drive device also can use the circuit element different from above-mentioned execution mode to form.Such as, current detection circuit is not limited to only use above-mentioned resistance and diode to form.
The quantity forming the LED of LED unit is more than one, and the quantity of the LED unit be connected in parallel is more than 2.In addition, the LED module that LED drive device is not limited to multiple LED unit to connect in parallel, also can using the various LED modules that are made up of one or more LED as driven object as driven object.In this situation, also can suitably detect according to dimming state the abnormality occurred in LED module, according to abnormality, suitably and easily carry out the drived control of LED drive device.
Except above-mentioned DC/DC transducer, current detection circuit and control circuit portion in LED drive device, other circuit can also be provided with.In addition, in LED drive device, export to LED module and drive the formation in the drive circuit portion of electric power to be also not limited to DC power supply and DC/DC transducer.Such as, AC power and AC/DC transducer can also be used.
In addition, LED drive device of the present invention is not limited to the ligthing paraphernalia for irradiating space.Such as, LED drive device of the present invention also may be used for the ligthing paraphernalia of the backlight being used as various device.In addition, the present invention may be used for utilizing LED to irradiate the utensil of the light of special-purpose or to show and transmitting in the various devices such as the utensil of the information of the light self of use LED and can apply.
Process in above-mentioned execution mode can perform with software, also can carry out with hardware circuit.
The program of the process performing above-mentioned execution mode can be provided, also this program can be recorded in the recording mediums such as CD-ROM, floppy disk, hard disk, ROM, RAM, storage card and be supplied to user.Also program can be downloaded to device via communication lines such as networks.Performed by CPU etc. according to its program based on process illustrated in the article of above-mentioned flow chart.
Should expect that above-mentioned execution mode is not used in restriction for illustration on whole points.Scope of the present invention is not represented by above-mentioned explanation but represented by claims, comprises the whole change in the meaning and scope that are equal to the scope of claims.
Claims (6)
1. a LED drive device, it is the LED drive device that the LED module that forms being connected in parallel to multiple LED unit according to light modulation index signal that is light-emitting diode (LED) module carry out light modulation action, this LED unit is made up of a LED or the LED of more than 2 that is connected in series, the feature of this LED drive device is to possess:
Drive circuit portion, it exports driving electric power to described LED module;
Current detection circuit, it is connected to described LED module, and detects the electric current flowed in described LED module, exports the detection voltage corresponding with testing result; And
Control circuit portion, it compares the described detection voltage exported from described current detection circuit and the threshold voltage corresponding with described light modulation index signal, and detects the abnormality of described LED module according to this comparative result,
Described threshold voltage correspond to multiple described light modulation index signal separately in, the short-circuit detecting quantity of described LED of specified quantity or the disconnection detection quantity of described LED unit,
When described detection voltage does not exceed in the prescribed limit of described specified quantity in the short-circuit detecting quantity of described LED or the disconnection detection quantity of described LED unit, described control part does not detect described abnormality according to described comparative result,
When described detection voltage becomes the abnormal voltage not in described prescribed limit, described control part detects described abnormality according to described testing result.
2. LED drive device according to claim 1, is characterized in that,
Described control circuit portion has:
Light modulation table storage part, it prestores the dimming ratio information corresponding with each signal in multiple described light modulation index signal;
Threshold voltage table storage part, it prestores the information about the threshold voltage corresponding with each signal in multiple described light modulation index signal;
Dimming ratio obtaining section, its information stored based on described light modulation table storage part obtains the dimming ratio information corresponding with described light modulation index signal;
Threshold voltage obtaining section, its information stored based on described threshold voltage table storage part obtains the threshold voltage corresponding with described light modulation index signal;
Information generated efferent, its dimming ratio information obtained based on described dimming ratio obtaining section carrys out output pwm signal information generated;
PWM signal generation section, it generates PWM dim signal based on the pwm signal information generated exported from described information generated efferent, and exports the PWM dim signal of generation to described drive circuit portion; And
Abnormity detection portion, its threshold voltage that described threshold voltage obtaining section is obtained and comparing from the described detection voltage that described current detection circuit is transfused to, and detect the abnormality of described LED module according to this comparative result.
3. LED drive device according to claim 1, is characterized in that,
Described control circuit portion has:
Light modulation table storage part, it prestores the dimming ratio information corresponding with each signal in multiple described light modulation index signal;
Dimming ratio obtaining section, its information stored based on described light modulation table storage part obtains the dimming ratio information corresponding with described light modulation index signal;
Information generated efferent, its dimming ratio information obtained based on described dimming ratio obtaining section carrys out output pwm signal information generated;
PWM signal generation section, it generates PWM dim signal based on the pwm signal information generated be output from described information generated efferent, and exports the PWM dim signal of generation to described drive circuit portion;
Threshold voltage calculating part, its dimming ratio information obtained based on described dimming ratio obtaining section and described light modulation index signal calculate the threshold voltage corresponding with described light modulation index signal; And
Abnormity detection portion, its threshold voltage that described threshold voltage calculating part is calculated and comparing from the described detection voltage that described current detection circuit is transfused to, and detect the abnormality of described LED module according to this comparative result.
4. LED drive device according to claim 1, is characterized in that,
Described control circuit portion, when detecting the abnormality of described LED module, controls described drive circuit portion and to stop or the electric power reduced to described LED module supplies.
5. LED drive device according to claim 3, is characterized in that,
Described control circuit portion also has:
Decision signal efferent, it is when described abnormity detection portion detects the abnormality of described LED module, output error decision signal; And
Rub-out signal generating unit, it, when being transfused to described wrong decision signal from described decision signal efferent, exports described rub-out signal to described drive circuit portion.
6. a ligthing paraphernalia, is characterized in that, possesses:
LED module, it is formed by connecting in parallel by multiple LED unit, and described LED unit is formed by connecting in the mode of series connection by more than one LED;
Drive the LED drive device described in any one in the Claims 1 to 5 of described LED module; And
Light adjusting and controlling device, it exports described light modulation index signal to described LED drive device.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012123181A JP5781469B2 (en) | 2012-05-30 | 2012-05-30 | LED driving device and lighting apparatus |
| JP2012-123181 | 2012-05-30 |
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| CN103458565B true CN103458565B (en) | 2016-03-23 |
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| JP6296386B2 (en) * | 2014-03-11 | 2018-03-20 | パナソニックＩｐマネジメント株式会社 | Light control device and lighting system using the same |
| JP6707358B2 (en) | 2016-02-12 | 2020-06-10 | ローム株式会社 | LCD backlight LED drive circuit, its control circuit, electronic equipment |
| KR101753193B1 (en) * | 2017-03-10 | 2017-07-03 | 김종희 | Current control method for LED lighting fixtures through PWM control of LED modules connected in parallel |
| JP2021022512A (en) * | 2019-07-29 | 2021-02-18 | パナソニックＩｐマネジメント株式会社 | Lighting monitoring system and lighting monitoring method |
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| JP2010123273A (en) * | 2008-11-17 | 2010-06-03 | Ccs Inc | Led lighting device |
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| JP2013251065A (en) | 2013-12-12 |
| JP5781469B2 (en) | 2015-09-24 |
| CN103458565A (en) | 2013-12-18 |
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