CN202841658U - Intelligent ten-pin LED drive chip - Google Patents
Intelligent ten-pin LED drive chip Download PDFInfo
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- CN202841658U CN202841658U CN2012205571091U CN201220557109U CN202841658U CN 202841658 U CN202841658 U CN 202841658U CN 2012205571091 U CN2012205571091 U CN 2012205571091U CN 201220557109 U CN201220557109 U CN 201220557109U CN 202841658 U CN202841658 U CN 202841658U
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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
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Abstract
The utility model relates to the technical field of integrated chips and discloses an intelligent ten-pin LED drive chip. The intelligent ten-pin LED drive chip comprises an angle detection circuit for detecting voltage signals inputted by a triac dimmer, and the angle detection circuit is connected with a dimming and decoding circuit which is connected with an MOSFET (metal-oxide-semiconductor field-effect transistor) switching signal control circuit. The intelligent ten-pin LED drive chip is capable of updating a traditional lighting system using a TRIAC for dimming to an LED lighting system rapidly at a low cost without changing existing infrastructure, wide-range and stable intensity control can be guaranteed to be provided during use of LED lamps, and flicker can be avoided.
Description
Technical field
The utility model relates to the integrated chip technical field, particularly a kind of ten pin LED intelligent drives chips.
Background technology
Owing to the TRIAC(controllable silicon dimmer that incandescent lamp uses is simple in structure, cost is low) just can realize easily light modulation, so all be that employing incandescent lamp and fluorescent lamp throw light in the most dwelling house, commercial and industrial occasion.Along with the proposition of green illumination, the LED illumination has become a mainstream technology.At present, every country is promoting to substitute incandescent lamp and the fluorescent lamp that uses in dwelling house, the commercial and industrial occasion with the LED lamp.But, want realization and replace incandescent lamp with the LED lamp, just must be able to use existing power supply control and circuit realization to the light modulation of LED lamp.TRIAC is to be that incandescent lamp or Halogen lamp LED design specially, and incandescent lamp and Halogen lamp LED all are resistive loads for TRI AC, and what impact the very little variation of voltage can not produce on their brightness; And LED is light-emitting diode, be luminous energy with electric energy conversion directly, as long as voltage has very little variation, will cause the great changes of LED lamp brightness, therefore when using TRIAC directly the LED lamp to be carried out light modulation, can produce the flicker of 120Hz and/or can not realize the light modulation ratio of 100:1.
The utility model content
The purpose of this utility model is for above-mentioned deficiency, a kind of ten pin LED intelligent drives chips are provided, this ten pin LED intelligent drives chip is combined with existing TRIAC and can be kept original dimming behavior, and can so that when brightness adjustment control the brightness of LED lamp change steadily, can not produce stroboscopic phenomenon.
For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of ten pin LED intelligent drives chips, comprise the angle testing circuit for detection of the voltage signal of controllable silicon dimmer input, described angle testing circuit is connected with the light modulation decoding circuit, and described light modulation decoding circuit connects MOSFET pipe switching signal control circuit; Described angle testing circuit comprises the comparator C 1 that anode is connected with the tenth pin BLDR of described chip, the negative terminal of described comparator C 1 connects the 7.2V level, the output serial connection delayer T1 of described comparator C 1, be connected with the branch road of releasing between the anode of described comparator C 1 and described the tenth pin BLDR, the branch circuit parallel connection that described release branch road and described comparator C 1 and timer T1 form, described release branch road and described timer T1 are connected the buffer B1 in the described light modulation decoding circuit simultaneously, and described buffer B1 connects the first pin ASNS of described chip; Described light modulation decoding circuit also comprises comparator C 2, the positive termination 4.9V level of described comparator C 2, the negative terminal of described comparator C 2 connects the anode of comparator C 3 and the second pin FLTR1 of described chip simultaneously, the output of described comparator C 2 connects the Enable Pin of comparator C 3, the negative terminal of described comparator C 3 connects ramp generator RAMP GEN, described ramp generator RAMP GEN can produce 1～3V, 5.9KHz sawtooth waveforms, the output of described comparator C 3 connects the three-prong DIM of described chip and described MOSFET pipe switching signal control circuit simultaneously; Described MOSFET pipe switching signal control circuit comprises controller, and the output of described controller connects the 8th pin GATE of described chip.
As a kind of improvement, described MOSFET pipe switching signal control circuit also comprises the comparator C 6 that anode is connected with the 4th pin COFF of described chip, the negative terminal of described comparator C 6 connects the 1.276V level, the output of described comparator C 6 is held with S end and R that the output of described controller is connected respectively latch LATCH, and the Q end of described latch LATCH connects described the 8th pin GATE.
As further improvement, described MOSFET pipe switching signal control circuit also comprises the power sense circuit that is connected with the 9th pin VCC of described chip, the output of described power sense circuit is held two inputs that are connected respectively with door G3 with the Q of described latch LATCH, described output with door G3 is connected buffer B2, and described buffer B2 connects described the 8th pin GATE.
As further improvement, also be connected with overvoltage protection and current detection circuit and current detection and feedback circuit between described light modulation decoding circuit and the described MOSFET pipe switching signal control circuit.
As further improvement; described overvoltage protection and current detection circuit comprise field effect transistor FET2; the grid of described field effect transistor FET2 connects the output of described comparator C 3; the drain electrode contact resistance R2 of described field effect transistor FET2; described resistance R 2 connects the 750mV level; contact resistance R3 is gone back in the drain electrode of described field effect transistor FET2, and described resistance R 3 connects the 5th pin FLTR2 of described current detection and feedback circuit and described chip simultaneously.
As further improvement, described current detection and feedback circuit comprises the comparator C 4 that negative terminal is connected with described resistance R 3, the anode of described comparator C 4 connects the anode of comparator C 5, the negative terminal of described comparator C 5 connects the 1.27V level, common the 7th pin ISNS that connects described chip of the anode that the anode of described comparator C 4 is connected with comparator C, the output that described comparator C 4 is connected with comparator C all connects described controller.
As further improvement, the described branch road of releasing comprises the resistance R 1 of the anode that connects simultaneously described the tenth pin BLDR and described comparator C 1, described resistance R 1 connects the drain electrode of acoustic effect pipe FET1, and the grid of described field effect transistor FET1 connects described buffer B1 simultaneously with described timer T1.
The beneficial effects of the utility model are: because ten pin LED intelligent drives chips described in the utility model comprise the angle testing circuit for detection of the voltage signal of controllable silicon dimmer input, the angle testing circuit is connected with the light modulation decoding circuit, and the light modulation decoding circuit connects MOSFET pipe switching signal control circuit; 80V～270V alternating current is exported the tenth pin BLDR that the ac voltage signal that carries different angles information is input to chip after controllable silicon dimmer (TRIAC) is regulated, the level that the BLDR pin detects compares by the comparator C 1 of angle testing circuit inside, thereby judges that TRIAC is conducting or shutoff.When TRIAC was in conducting state, the ac voltage signal that carries different angles information drove buffer B1 in release branch road and the light modulation decoding circuit through the delay of timer T1 after by comparator C 1.Buffer B1 output in the light modulation decoding circuit connects the first pin ASNS, duty ratio of the first pin ASNS output is proportional to the voltage signal of 0～4V of TRIAC signal, the voltage signal of 0～4V is input in the comparator C 3 by the second pin FLTR1, produce a 1～3V with ramp generator RAMP GEN, 5.9kHz sawtooth signal compare after, the voltage signal of a higher frequency of output, this signal driver three-prong DIM and MOSFET pipe switching signal control circuit are controlled the 8th pin GATE driving LED lamp by controller.Can so that when brightness adjustment control the brightness of LED lamp change steadily, can not produce stroboscopic phenomenon.
In sum, ten pin LED intelligent drives chips described in the utility model can not be upgraded to the LED illuminator in the situation that existing infrastructure is not changed with will having the traditional illumination system fast and low-cost that uses TRIAC to carry out light modulation now, and guarantee that the LED lamp in use can provide brightness adjustment wide region, stable, can't produce flicker.
Description of drawings
Fig. 1 is internal circuit schematic diagram of the present utility model;
Fig. 2 is pin figure of the present utility model;
Fig. 3 is dimmer application circuit theory diagrams of the present utility model;
Embodiment
Below in conjunction with drawings and Examples, further set forth the utility model.
Shown in Fig. 1, Fig. 2 and Fig. 3 are common, a kind of ten pin LED intelligent drives chips, the chip model is OR8445, comprise the angle testing circuit for detection of the voltage signal of controllable silicon dimmer input, the angle testing circuit is connected with the light modulation decoding circuit, and the light modulation decoding circuit connects MOSFET pipe switching signal control circuit; The angle testing circuit comprises the comparator C 1 that anode is connected with the tenth pin BLDR of chip, the negative terminal of comparator C 1 connects the 7.2V level, the output serial connection timer T1 of comparator C 1, the delay time of T1 is 4 μ s, be connected with the branch road of releasing between the anode of comparator C 1 and the tenth pin BLDR, the branch circuit parallel connection that branch road and described comparator C 1 and timer T1 form of releasing, release branch road and timer T1 is connected buffer B1 in the light modulation decoding circuit simultaneously, and buffer B1 connects the first pin ASNS of chip; The light modulation decoding circuit also comprises comparator C 2, the positive termination 4.9V level of comparator C 2, the negative terminal of comparator C 2 connects the anode of comparator C 3 and the second pin FLTR1 of chip simultaneously, the output of comparator C 2 connects the Enable Pin of comparator C 3, the negative terminal of comparator C 3 connects ramp generator RAMP GEN, ramp generator RAMP GEN is for can produce 1～3V, 5.9KHz saw-toothed wave generator, the output of comparator C 3 connects the three-prong DIM of chip and MOSFET pipe switching signal control circuit simultaneously; MOSFET pipe switching signal control circuit comprises controller, and the output of controller connects the 8th pin GATE of chip.The branch road of releasing comprises the resistance R 1 of the anode that connects simultaneously the tenth pin BLDR and comparator C 1, the resistance of R1 is 230 Ω, resistance R 1 connects the drain electrode of field effect transistor FET1, the grid of field effect transistor FET1 connects buffer B1 simultaneously with timer T1, and buffer B1 can be by the first pin ASNS output 0～4V voltage signal.80V～270V alternating current is exported the tenth pin BLDR that the ac voltage signal that carries different angles information is input to chip after TRIAC regulates, the level that the BLDR pin detects compares by the comparator C 1 of angle testing circuit inside, thereby judges that TRIAC is conducting or shutoff.When TRIAC was in conducting state, the ac voltage signal that carries different angles information drove buffer B1 in release branch road and the light modulation decoding circuit through the delay of timer T1 after by comparator C 1.Buffer B1 output in the light modulation decoding circuit connects the first pin ASNS, duty ratio of the first pin ASNS output is proportional to the voltage signal of 0～4V of TRIAC signal, the voltage signal of 0～4V is input in the comparator C 3 by the second pin FLTR1, produce a 1～3V with ramp generator RAMP GEN, 5.9kHz sawtooth signal compare after, the voltage signal of a higher frequency of output, this signal driver three-prong DIM and MOSFET pipe switching signal control circuit are controlled the 8th pin GATE driving LED lamp by controller.Can so that when brightness adjustment control the brightness of LED lamp change steadily, can not produce stroboscopic phenomenon.
Described MOSFET pipe switching signal control circuit also comprises the comparator C 6 that anode is connected with the 4th pin COFF of chip, the negative terminal of comparator C 6 connects the 1.276V level, the output of comparator C 6 is held with S end and R that the output of controller is connected respectively latch LATCH, be connected the drain electrode of field effect transistor FET3 between the anode of comparator C 6 and the four pin COFF, the grid of field effect transistor FET3 connects the output with door G3, and the Q end of latch LATCH connects the 8th pin GATE.MOSFET pipe switching signal control circuit also comprises the power sense circuit that is connected with the 9th pin VCC that is used for input power of chip, the 9th pin VCC connects voltage stabilizing circuit REGULATORS and power supply low level detection circuit VccUVLO simultaneously, power supply low level detection circuit VccUVLO connects respectively and door G1 with the output that is connected breaking circuit THERMAL SHUTDOWN, hold two inputs that are connected respectively with door G3 with the output of door G1 with the Q of latch LATCH, be connected buffer B2 with the output of door G3, buffer B2 connects the 8th pin GATE.The protection chip carries out work in the normal situation of power supply, can prolong the useful life of chip.
Also be connected with overvoltage protection and current detection circuit and current detection and feedback circuit between light modulation decoding circuit and the MOSFET pipe switching signal control circuit.Overvoltage protection and current detection circuit comprise field effect transistor FET2; the grid of field effect transistor FET2 connects the output of comparator C 3; the drain electrode contact resistance R2 of field effect transistor FET2; the resistance of resistance R 2 is 50k Ω; resistance R 2 connects the 750mV level; contact resistance R3 is gone back in the drain electrode of field effect transistor FET2, and the resistance of resistance R 3 is 370k Ω, and resistance R 3 connects the 5th pin FLTR2 of described current detection and feedback circuit and chip simultaneously.Exchange the output signal of optical decoding circuit and carry out filtering, produce the dc voltage that an amplitude changes from 0～750mA.Corresponding dimmer duty ratio is from 25% to 75% to change, thereby TRIAC angle of flow scope is directly controlled the peak current of LED to 135 degree from 45 degree, obtains almost the dimming scope from 0%～100%.
Current detection and feedback circuit comprises the comparator C 4 that negative terminal is connected with resistance R 3, the anode of comparator C 4 connects the anode of comparator C 5, the negative terminal of comparator C 5 connects the 1.27V level, the common contact resistance R4 of the anode of the anode of comparator C 4 and comparator C 5, resistance R 4 resistances are 1k Ω, resistance R 4 connects the 7th pin ISNS of chip, the anode that the anode of comparator C 4 is connected with comparator C also connects the drain electrode of field effect transistor FET4 jointly, the grid of field effect transistor FET4 connects timer T2, the setting-up time of timer T2 is 125ns, timer T2 connects the output of inverter I, the input of inverter I connects the output with door G3, and the output that comparator C 4 is connected with comparator C all connects controller.
The base stage of field effect transistor FET1, field effect transistor FET2, field effect transistor FET3 and field effect transistor FET4 respectively with corresponding source shorted, and ground connection.
As shown in Figure 2, the pin of chip is described as follows:
The first pin ASNS: the PWM output pin of light modulation decoding circuit.Output signal is 0～4V, and duty ratio is proportional to TRIAC open-interval pwm signal.
The second pin FLTR1: the input pin of first filtering signal.The pwm signal filtering of 120Hz, the 0～4V of ASNS output is converted to a direct current signal, this direct current signal by with one from 1～3V, frequency is that the sawtooth signal of 5.9KHz compares, and produce a higher frequency, and duty ratio is proportional to TRIAC open-interval pwm signal.When this pin is moved the representative value greater than 4.9V(to) time, three-state entered.
Three-prong DIM: the difunctional DIM pin of I/O.This pin can drive by external PWM signal, to reach the purpose of light modulation.It also can be used as output signal, is connected to the DIM pin of other chip, and perhaps other led driver then can be simultaneously carries out light modulation to many groups led circuit.
The 4th pin COFF: the turn-off time arranges pin.The user is connected to the electric capacity (not shown in FIG.) of this pin and the current value that flows into this pin, the turn-off time that setting controller CONTROLLER is constant by setting.
The 5th pin FLTR2: the second filtering signal input pin.The electric capacity (not shown in FIG.) that is connected to this pin converts the PWM dim signal of light modulation decoding circuit output to a direct current signal, with control LED electric current.This pin also can be as simulation light modulation input.
The 6th pin GND: chip ground pin.
The 7th pin ISNS:LED current detecting pin is used for arranging maximum LED electric current.
The driving pin of the 8th pin GATE: field effect transistor FET5.
The 9th pin VCC: input voltage pin.This pin provides supply voltage for internal control circuit and gate drivers.
The tenth pin BLDR: the pin of releasing.Provide input signal to the angle testing circuit, and can by the 230 Ω resistance of releasing, make electric current flow through TRIAC, and guarantee that TRIAC can work.
Light modulation principle of the present utility model is as follows: the OR8445 chip can be realized the linear regulation to LED brightness with the TRIAC combination.As shown in Figure 3,80V～270V alternating current access TRIAC, the output of TRIAC connects rectifier bridge, the output of rectifier bridge connects step-down, phase detectors, step-down, the output of phase detectors connects the tenth pin BLDR of OR8445 chip, the 8th pin GATE contact resistance R5 of OR8445 chip, resistance R 5 connects the grid of field effect transistor FET5, the drain electrode of field effect transistor FET5 connects the LED lamp, be the power supply of LED lamp, the base stage of field effect transistor FET5 is connected the 7th pin ISNS that connects the OR8445 chip with source shorted, be connected with resistance R 6 between the 7th pin ISNS of OR8445 chip and the 6th pin GND.The output after TRIAC regulates of 80V～270V alternating current contains the ac voltage signal of different light modulation angle informations, ac voltage signal is after the rectifier bridge rectification, through step-down, after processing, phase detectors offer the tenth pin BLDR of OR8445 chip, the OR8445 chip is according to the step-down of the tenth pin BLDR input, the pwm signal of the LED current feedback signal control output different duty of the voltage signal that contains low pressure angle of flow information that phase detectors are sent here and the 7th pin ISNS sampling, be used for driving outside field effect transistor FET5, realize the work of constant-current driving LED lamp.Can not be upgraded to the LED illuminator in the situation that existing infrastructure is not changed with will having the traditional illumination system fast and low-cost that uses TRIAC to carry out light modulation now, and guarantee that LED in use can provide brightness adjustment wide region, stable, can't produce flicker.
The utility model is not limited to above-mentioned concrete execution mode, and those of ordinary skill in the art is from above-mentioned design, and without performing creative labour, all conversion of having done all drop within the protection range of the present utility model.
Claims (7)
1. ten pin LED intelligent drives chips, it is characterized in that, comprise that described angle testing circuit is connected with the light modulation decoding circuit for detection of the angle testing circuit of the voltage signal of controllable silicon dimmer input, described light modulation decoding circuit connects MOSFET pipe switching signal control circuit;
Described angle testing circuit comprises the comparator C 1 that anode is connected with the tenth pin BLDR of described chip, the negative terminal of described comparator C 1 connects the 7.2V level, the output serial connection delayer T1 of described comparator C 1, be connected with the branch road of releasing between the anode of described comparator C 1 and described the tenth pin BLDR, the branch circuit parallel connection that described release branch road and described comparator C 1 and timer T1 form, described release branch road and described timer T1 are connected the buffer B1 in the described light modulation decoding circuit simultaneously, and described buffer B1 connects the first pin ASNS of described chip;
Described light modulation decoding circuit also comprises comparator C 2, the positive termination 4.9V level of described comparator C 2, the negative terminal of described comparator C 2 connects the anode of comparator C 3 and the second pin FLTR1 of described chip simultaneously, the output of described comparator C 2 connects the Enable Pin of comparator C 3, the negative terminal of described comparator C 3 connects ramp generator RAMP GEN, described ramp generator RAMP GEN can produce 1～3V, 5.9KHz sawtooth waveforms, the output of described comparator C 3 connects the three-prong DIM of described chip and described MOSFET pipe switching signal control circuit simultaneously;
Described MOSFET pipe switching signal control circuit comprises controller, and the output of described controller connects the 8th pin GATE of described chip.
2. ten pin LED intelligent drives chips according to claim 1, it is characterized in that, described MOSFET pipe switching signal control circuit also comprises the comparator C 6 that anode is connected with the 4th pin COFF of described chip, the negative terminal of described comparator C 6 connects the 1.276V level, the output of described comparator C 6 is held with S end and R that the output of described controller is connected respectively latch LATCH, and the Q end of described latch LATCH connects described the 8th pin GATE.
3. ten pin LED intelligent drives chips according to claim 2, it is characterized in that, described MOSFET pipe switching signal control circuit also comprises the power sense circuit that is connected with the 9th pin VCC of described chip, the output of described power sense circuit is held two inputs that are connected respectively with door G3 with the Q of described latch LATCH, described output with door G3 is connected buffer B2, and described buffer B2 connects described the 8th pin GATE.
4. ten pin LED intelligent drives chips according to claim 1 is characterized in that, also are connected with overvoltage protection and current detection circuit and current detection and feedback circuit between described light modulation decoding circuit and the described MOSFET pipe switching signal control circuit.
5. ten pin LED intelligent drives chips according to claim 4; it is characterized in that; described overvoltage protection and current detection circuit comprise field effect transistor FET2; the grid of described field effect transistor FET2 connects the output of described comparator C 3; the drain electrode contact resistance R2 of described field effect transistor FET2; described resistance R 2 connects the 750mV level; contact resistance R3 is gone back in the drain electrode of described field effect transistor FET2, and described resistance R 3 connects the 5th pin FLTR2 of described current detection and feedback circuit and described chip simultaneously.
6. ten pin LED intelligent drives chips according to claim 5, it is characterized in that, described current detection and feedback circuit comprises the comparator C 4 that negative terminal is connected with described resistance R 3, the anode of described comparator C 4 connects the anode of comparator C 5, the negative terminal of described comparator C 5 connects the 1.27V level, common the 7th pin ISNS that connects described chip of the anode that the anode of described comparator C 4 is connected with comparator C, the output that described comparator C 4 is connected with comparator C all connects described controller.
7. ten pin LED intelligent drives chips claimed in claim 1, it is characterized in that, the described branch road of releasing comprises the resistance R 1 of the anode that connects simultaneously described the tenth pin BLDR and described comparator C 1, described resistance R 1 connects the drain electrode of field effect transistor FET1, and the grid of described field effect transistor FET1 connects described buffer B1 simultaneously with described timer T1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012205571091U CN202841658U (en) | 2012-10-26 | 2012-10-26 | Intelligent ten-pin LED drive chip |
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| CN2012205571091U CN202841658U (en) | 2012-10-26 | 2012-10-26 | Intelligent ten-pin LED drive chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107358912A (en) * | 2017-08-18 | 2017-11-17 | 深圳市德普微电子有限公司 | A kind of single dual-colored LED display screen drive chip |
| CN106604479B (en) * | 2017-01-23 | 2017-12-29 | 无锡恒芯微科技有限公司 | The non-isolated LED light adjusting circuits dimmed with PWM and direct current |
-
2012
- 2012-10-26 CN CN2012205571091U patent/CN202841658U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106604479B (en) * | 2017-01-23 | 2017-12-29 | 无锡恒芯微科技有限公司 | The non-isolated LED light adjusting circuits dimmed with PWM and direct current |
| CN107358912A (en) * | 2017-08-18 | 2017-11-17 | 深圳市德普微电子有限公司 | A kind of single dual-colored LED display screen drive chip |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20181026 |