CN103079320A - LED (Light Emitting Diode) constant current controller and LED constant current drive circuit - Google Patents
LED (Light Emitting Diode) constant current controller and LED constant current drive circuit Download PDFInfo
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- CN103079320A CN103079320A CN2013100270580A CN201310027058A CN103079320A CN 103079320 A CN103079320 A CN 103079320A CN 2013100270580 A CN2013100270580 A CN 2013100270580A CN 201310027058 A CN201310027058 A CN 201310027058A CN 103079320 A CN103079320 A CN 103079320A
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Abstract
The invention provides an LED (Light Emitting Diode) constant current controller and an LED constant current drive circuit. The LED constant current drive circuit only comprises two parts, namely an input rectifying circuit and LED constant current control modules, wherein the LED constant current control modules comprise LED string lights and the LED constant current controller which are connected in parallel, and the LED constant current controller comprises an NMOS (N-channel metal oxide semiconductor) tube, a current detection resistor, a drive, a reference source and a logic circuit and drives the LED string lights by a constant-magnitude current through detecting the voltage supplied by a power supply device and controlling the magnitude of the current flowing through the LED string lights. According to the LED constant current controller and the LED constant current drive circuit, a drive circuit manner with an extremely-simplified periphery is provided for an LED constant current driving power supply, wherein the LED constant current control modules can be combined differently according to user requirements; and the whole circuit is simple in structure, high in power factor, low in harmonic distortion, small in volume, convenient in use debugging and mounting, flexible in use and low in production cost.
Description
Technical field
The present invention relates to a kind of led drive circuit, particularly relate to a kind of LED constant-current controller and LED constant-current drive circuit.
Background technology
AC-powered LED illumination can reduce cost, but voltage ripple of power network can cause the LED overcurrent to drive and affect its useful life, is important so in the occasion of Alternating Current Power Supply LED is carried out the constant current driving.Led drive circuit mainly adopts the schemes such as non-isolation Buck step-down scheme, PSR former limit feedback and isolation pulse width modulation (PWM) Switching Power Supply at present.Though Buck step-down scheme is simple in structure, but still exists filter capacitor to limit useful life, and required power type device, inductance etc. are unfavorable for the minimum words of cost.The former limit of PSR feedback requires high to transformer, the batch production consistency is bad.PWM Switching Power Supply scheme constant-current circuit mainly contains two kinds of methods: a kind of direct application PWM integrated circuit carries out the peak value current limliting, and this method is simple in structure, but constant current accuracy is poor; Another method is sampled to the LED operating current, obtaining sampled voltage and reference voltage compares and enlarges the rear drive optocoupler PWM integrated circuit is carried out closed loop feedback control, this method constant current accuracy is high, but owing to need special-purpose constant-current circuit, peripheral circuit is complicated, be not easy, cost compare is high.
Summary of the invention
In order to address the above problem, the purpose of this invention is to provide a kind of LED constant-current controller, when driving many series LEDs, finish LED constant current control according to the size of input voltage.
Another object of the present invention provides a kind of LED constant-current drive circuit, in that serial connection LED lamp number is had the different application scenarios that require, is combined into multiple constant-current drive circuit and satisfies application requirements.
For reaching as above purpose, the invention provides following technical scheme:
A kind of LED constant-current controller comprises: NMOS pipe, current sense resistor, driver, a reference source and logical circuit; Described LED constant-current controller is connected in parallel on the LED lamp string two ends of required control or is connected in series with LED lamp string, wherein the drain electrode of NMOS pipe connects the anode input of controller, the cathode end that connects controller behind the negative input of the source electrode connection driver of NMOS pipe and the series current detection resistance, the output of driver connects the grid of NMOS pipe, a reference source provides reference voltage to use to the anodal input of driver and logical circuit, logical circuit is by coming the anode voltage of LED lamp string and default turning-on voltage threshold value and shutoff voltage threshold ratio driver is controlled, and the opening and turn-off of control NMOS pipe realizes that the constant current to LED lamp string drives control.
Preferably, when the LED constant-current controller was connected in parallel on the two ends of required control LED lamp string, described anode input connected the anode of the LED lamp string of required control, and described cathode end connects the negative electrode of LED lamp string.
Preferably, when LED constant-current controller and LED lamp string were connected in series, the anode input of controller was current input terminal, and cathode end is current output terminal.
A kind of application is the LED constant-current drive circuit of LED constant-current controller as mentioned above, comprising: supply unit comprises input rectification circuit, in order to supply power supply; Some LED constant-current control modules, be connected in series in the circuit, utilize supply unit supply LED luminous, described LED constant-current control module comprises: a LED lamp string, it comprises 1 the above LED that is connected in series, the one LED constant-current controller is connected in parallel in anode and the negative electrode of a described LED lamp string, detects the voltage that supply unit provides and the electric current that constant size is provided for LED lamp string.
Preferably, also comprise some the 2nd LED lamp strings and some the 2nd LED constant-current controllers that are connected in the circuit, wherein the anode input of the 2nd LED constant-current controller is current input terminal, cathode end is current output terminal, utilize the flow through size of LED lamp string stream of LED constant-current controller control, to realize constant size current drives LED lamp string.
Compared with prior art, a kind of LED constant-current controller and LED constant-current drive circuit provided by the invention have the following advantages:
1, behind the rectification circuit without the filter capacitor in the traditional circuit, can prolong the working life of whole drive circuit;
2, can provide higher constant current accuracy;
3, behind the rectification circuit without the filter capacitor in the traditional circuit, can improve power factor and the total harmonic distortion of drive circuit, reduce drive circuit to the interference of electrical network;
4, AC power supply, wide-voltage range input;
5, circuit structure is simple, volume is little, easy for installation, cost is low.
Description of drawings
Fig. 1 is the fundamental diagram of LED constant-current controller of the present invention;
Fig. 2 is LED constant-current control module circuit diagram in the LED constant-current drive circuit of the present invention;
Fig. 3 is LED constant-current controller internal circuit framework of the present invention;
Fig. 4 is LED constant-current drive circuit application circuit of the present invention;
Fig. 5 is that the operating current of LED lamp string in Fig. 4 circuit changes schematic diagram with the AC cycle.
Embodiment
Embodiments of the invention provide the embodiment of LED constant-current controller and LED constant-current drive circuit.As shown in Figure 3, the LED constant-current controller comprises: NMOS pipe, current sense resistor, driver, a reference source and logical circuit; Described LED constant-current controller is connected in parallel on the LED lamp string two ends of required control or is connected in series with LED lamp string, wherein the drain electrode of NMOS pipe connects the anode input of controller, the cathode end that connects controller behind the negative input of the source electrode connection driver of NMOS pipe and the series current detection resistance, the output of driver connects the grid of NMOS pipe, a reference source provides reference voltage to use to the anodal input of driver and logical circuit, logical circuit is by coming the anode voltage of LED lamp string and default turning-on voltage threshold value and shutoff voltage threshold ratio driver is controlled, and the opening and turn-off of control NMOS pipe realizes that the constant current to LED lamp string drives control.When the LED constant-current controller was connected in parallel on the two ends of required control LED lamp string, described anode input connected the anode of the LED lamp string of required control, and described cathode end connects the negative electrode of LED lamp string.When LED constant-current controller and LED lamp string were connected in series, the anode input of controller was current input terminal, and cathode end is current output terminal.
As shown in Figure 4, the LED constant-current drive circuit comprises: supply unit comprises input rectification circuit, in order to supply power supply; Some LED constant-current control modules, be connected in series in the circuit, utilize supply unit supply LED luminous, described LED constant-current control module comprises: a LED lamp string, it comprises 1 the above LED that is connected in series, the one LED constant-current controller (T1 to Tn) is connected in parallel in anode and the negative electrode of a described LED lamp string, detects the voltage that supply unit provides and the electric current that constant size is provided for LED lamp string.Circuit also comprises the 2nd LED lamp string and the 2nd LED constant-current controller (T(n+1) that is connected in the circuit), wherein the anode input of the 2nd LED constant-current controller is current input terminal, cathode end is current output terminal, utilize the flow through size of LED lamp string stream of LED constant-current controller control, to realize constant size current drives LED lamp string.
For better understanding the working method of LED constant-current drive circuit, below illustrate first and the operation principle of LED constant-current controller then LED constant-current drive circuit working method is described.
The operation principle of LED constant-current controller is (such as Fig. 1, Fig. 2, shown in Figure 3): voltage is gradually in the elevation process behind the AC AC rectification, as LED constant-current controller both end voltage Vak during less than Vdrop voltage, begin to have electric current to flow through I_ak in the LED constant-current controller, the electric current that the LED lamp in parallel with the LED constant-current controller ganged up among Fig. 2 is 0, I_ak can increase with the increase of Vak, this moment I_ak＜Imax(Fig. 3 LED constant-current controller in this process inside roughly operation principle be: when 0V＜Vak＜Vdrop, the driving signal that logical circuit produces driver is managed complete conducting by NMOS, and NMOS pipe conducting after-current Isense is by NMOS pipe and current sense resistor; Isense can increase along with the increase of Vak; The voltage that I_ak ≈ Isense=Vak/ current sense resistor＜Imax in this process, Isense produce at current sense resistor is much smaller than the magnitude of voltage of reference voltage source); When LED constant-current controller both end voltage Vak is elevated to Vdrop voltage and Vak＜Voff_th voltage, the LED constant-current controller begins to pass through with the maximum current Imax that the LED constant-current controller is limited, the electric current that the LED lamp in parallel with the LED constant-current controller ganged up among Fig. 2 still is 0, this moment I_ak=Imax(Fig. 3 LED constant-current controller in this process inside roughly operation principle be: after voltage that the rising edge testing circuit detects Vak is elevated to Vdrop voltage, the driving signal that logical circuit produces driver is done at linear conducting region by the NMOS plumber, it is more insufficient namely to drive the less NMOS conducting of signal, and the electric current that the NMOS pipe flows through is also less; At Vak〉behind the Vdrop, Isense produces voltage more near the magnitude of voltage of reference voltage source at current sense resistor, and it is less to drive signal, and the NMOS conducting is more insufficient, the internal resistance of NMOS is larger, and the electric current I sense that flows through NMOS pipe and current sense resistor is clamped at Imax; Iak ≈ Isense=Imax=reference voltage/current sense resistor in this process, along with the rising of Vak, the energy that the NMOS pipe consumes is more); When LED constant-current controller both end voltage Vak is elevated to Voff_th voltage, the LED constant-current controller will turn-off (no current passes through), among Fig. 2 the LED lamp string in parallel with the LED constant-current controller will have electric current pass through (in this process the inside of Fig. 3 LED constant-current controller roughly operation principle be: after voltage that the rising edge testing circuit detects Vak is elevated to Voff_th voltage, logical circuit can turn-off the NMOS pipe fully, no current flows through in NMOS pipe and the current detection circuit, and electric current can flow through LED constant-current controller outside LED lamp string in parallel; I_ak ≈ Isense=0 in this process).Behind the AC AC rectification in the gradually reduction process of voltage, when LED constant-current controller both end voltage Vak is reduced to Von_th voltage and Vak greater than Vdrop voltage, the LED constant-current controller begins again to pass through with the maximum current Imax that the LED constant-current controller is limited, the electric current that the LED lamp in parallel with the LED constant-current controller ganged up among Fig. 2 still is 0, the inside of I_ak=Imax(this moment Fig. 3 LED constant-current controller in this process roughly operation principle is: detect the voltage drop of Vak when the trailing edge testing circuit behind Von_th voltage, the driving signal that logical circuit produces driver is operated in again linear conducting region by the NMOS pipe, it is more insufficient namely to drive the less NMOS conducting of signal, and the electric current that the NMOS pipe flows through is also less; Isense can produce voltage more away from the magnitude of voltage of reference voltage source at current sense resistor, and the NMOS conducting is more abundant, and the internal resistance of NMOS is less, and NMOS manages and the electric current I sense of current sense resistor still can be clamped at Imax but flow through; Iak ≈ Isense=Imax=reference voltage/current sense resistor in this process, along with the reduction of Vak, the NMOS pipe consumes fewer); When LED constant-current controller both end voltage Vak drops to Vdrop voltage, electric current I _ the ak that flows through in the LED constant-current controller begins to reduce, I_ak can reducing and reduce with Vak, this moment I_ak＜Imax, the electric current that the LED lamp in parallel with the LED constant-current controller ganged up among Fig. 2 still for the inside of 0(Fig. 3 LED constant-current controller in this process roughly operation principle be: detect the voltage drop of Vak when logical circuit behind Vdrop voltage, the driving signal that logical circuit produces driver is managed complete conducting by NMOS, and NMOS pipe conducting after-current Isense is by NMOS pipe and current sense resistor; Isense can reduce along with reducing of Vak; The voltage that I_ak ≈ Isense=Vak/ current sense resistor＜Imax in this process, Isense produce at current sense resistor is much smaller than the magnitude of voltage of reference voltage source).
LED constant-current drive circuit working method of the present invention (such as Fig. 4, shown in Figure 5): in whole AC ac cycle, the voltage of LED constant-current controller T (n+1) is always less than its Vdrop voltage, so I_ak (n+1) can be less than the maximum On current Imax ' of T (n+1) in the cycle at whole AC.Voltage is gradually in the elevation process behind the AC AC rectification, Voff_th voltage LED constant-current controller less than normal at first turn-offs among the T1 to Tn, LED lamp string in parallel will have electric current to flow through with it, and other conducting LED constant-current controller can be the maximum current limit that flows through LED lamp string in Imax; Along with the remaining LED constant-current controller of the rising of AC voltage can turn-off (after reaching the Voff_th voltage of corresponding LED constant-current controller) successively, until T1 to Tn when all turn-offing whole LED lamp string all can have electric current to pass through, this moment, Iled can be limited in the Imax '.Behind the AC AC rectification in the gradually reduction process of voltage, Von_th voltage at first conducting of LED constant-current controller bigger than normal among the T1 to Tn, LED lamp string in parallel will extinguish with it, and its can be the maximum current limit by other LED lamp string in Imax; Along with successively conducting of the remaining LED constant-current controller of the reduction of AC voltage (after reaching the Von_th voltage of corresponding LED constant-current controller), until the LED lamp string in parallel with T1 to Tn all extinguishes during the whole conducting of T1 to Tn, only have the lamp string of connecting with T (n+1) just to understand conducting, its electric current can be limited in Imax.With the variation of AC ac cycle, the LED constant-current drive circuit repeats the top course of work repeatedly, realizes the purpose that the LED constant current drives.
Annotate: selected LED constant-current controller T1 among 1, Fig. 4 ... the maximum current capability size of Tn is basically identical,
If Imax ≈ Imax1 ≈ Imax2 is ≈ ... ≈ Imaxn;
The maximum current capability Imax ' of selected LED constant-current controller T (n+1) among 2, Fig. 4=Imax (n+1)〉Imax;
The Vdrop electrical voltage point of 3, LED constant-current controller T (n+1) is greater than LED constant-current controller T1 ... Tn;
4, in the actual production, the otherness of components and parts makes LED constant-current controller T1 ... the Vdrop voltage of Tn there are differences.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also do some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a LED constant-current controller is characterized in that, comprising:
The NMOS pipe, current sense resistor, driver, a reference source and logical circuit;
Described LED constant-current controller is connected in parallel on the LED lamp string two ends of required control or is connected in series with LED lamp string, wherein the drain electrode of NMOS pipe connects the anode input of controller, the cathode end that connects controller behind the negative input of the source electrode connection driver of NMOS pipe and the series current detection resistance, the output of driver connects the grid of NMOS pipe, a reference source provides reference voltage to use to the anodal input of driver and logical circuit, logical circuit is by coming the anode voltage of LED lamp string and default turning-on voltage threshold value and shutoff voltage threshold ratio driver is controlled, and the opening and turn-off of control NMOS pipe realizes that the constant current to LED lamp string drives control.
2. LED constant-current controller according to claim 1, it is characterized in that: when the LED constant-current controller is connected in parallel on the two ends of required control LED lamp string, described anode input connects the anode of the LED lamp string of required control, and described cathode end connects the negative electrode of LED lamp string.
3. LED constant-current controller according to claim 1 is characterized in that: when LED constant-current controller and LED lamp string were connected in series, the anode input of controller was current input terminal, and cathode end is current output terminal.
4. use the as claimed in claim 1 LED constant-current drive circuit of LED constant-current controller for one kind, comprising:
Supply unit comprises input rectification circuit, in order to supply power supply; Some LED constant-current control modules, be connected in series in the circuit, utilize supply unit supply LED luminous, described LED constant-current control module comprises: a LED lamp string, it comprises 1 the above LED that is connected in series, the one LED constant-current controller is connected in parallel in anode and the negative electrode of a described LED lamp string, detects the voltage that supply unit provides and the electric current that constant size is provided for LED lamp string.
5. a kind of LED constant-current drive circuit according to claim 4, it is characterized in that, also comprise some the 2nd LED lamp strings and some the 2nd LED constant-current controllers that are connected in the circuit, wherein the anode input of the 2nd LED constant-current controller is current input terminal, cathode end is current output terminal, utilize the flow through size of LED lamp string stream of LED constant-current controller control, to realize constant size current drives LED lamp string.
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Cited By (7)
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| CN103974505A (en) * | 2013-02-06 | 2014-08-06 | 安恩国际公司 | LED Lighting Device |
| CN104219831A (en) * | 2013-06-03 | 2014-12-17 | 安恩科技股份有限公司 | Light-emitting diode lighting device having multiple driving stages |
| CN104797037A (en) * | 2014-01-16 | 2015-07-22 | 安恩科技股份有限公司 | Low-flicker light-emitting diode lighting device having multiple driving stages |
| CN105722272A (en) * | 2016-02-15 | 2016-06-29 | 深圳迈睿智能科技有限公司 | Initial voltage adaptive method for constant-voltage dimming power supply |
| CN106413201A (en) * | 2016-11-23 | 2017-02-15 | 赛尔富电子有限公司 | Constant-current power supply with various current outputs for LED lamps |
| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| US10596987B2 (en) | 2016-09-21 | 2020-03-24 | Hyundai Motor Company | Apparatus for controlling electric current of vehicle and vehicle having the apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103974505A (en) * | 2013-02-06 | 2014-08-06 | 安恩国际公司 | LED Lighting Device |
| CN103974505B (en) * | 2013-02-06 | 2016-05-04 | 安恩国际公司 | Light emitting diode illuminating apparatus |
| CN104219831A (en) * | 2013-06-03 | 2014-12-17 | 安恩科技股份有限公司 | Light-emitting diode lighting device having multiple driving stages |
| CN104797037A (en) * | 2014-01-16 | 2015-07-22 | 安恩科技股份有限公司 | Low-flicker light-emitting diode lighting device having multiple driving stages |
| CN104797037B (en) * | 2014-01-16 | 2017-04-12 | 安恩科技股份有限公司 | Low-flicker light-emitting diode lighting device having multiple driving stages |
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| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| CN107660013B (en) * | 2016-07-26 | 2024-04-05 | 上海莱托思电子科技有限公司 | LED two-end constant-current driving chip and constant-current driving method |
| US10596987B2 (en) | 2016-09-21 | 2020-03-24 | Hyundai Motor Company | Apparatus for controlling electric current of vehicle and vehicle having the apparatus |
| CN106413201A (en) * | 2016-11-23 | 2017-02-15 | 赛尔富电子有限公司 | Constant-current power supply with various current outputs for LED lamps |
| CN106413201B (en) * | 2016-11-23 | 2024-04-09 | 赛尔富电子有限公司 | Constant-current power supply for outputting various currents of LED lamp |
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Address after: 611731, room 1, building 3, No. 401, West Avenue, Chengdu hi tech Zone (West District, Sichuan) Patentee after: Chengdu Qi Chen electronic Limited by Share Ltd Address before: 611731 innovation center, No. 4, West core road, hi tech West District, Sichuan, Chengdu C341-343 Patentee before: Chengdu Chip-Rail Microelectronic Co., Ltd. |