CN203136246U - Dimming circuit suitable for linear high-voltage LED driver - Google Patents
Dimming circuit suitable for linear high-voltage LED driver Download PDFInfo
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- CN203136246U CN203136246U CN201320021348XU CN201320021348U CN203136246U CN 203136246 U CN203136246 U CN 203136246U CN 201320021348X U CN201320021348X U CN 201320021348XU CN 201320021348 U CN201320021348 U CN 201320021348U CN 203136246 U CN203136246 U CN 203136246U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model provides a dimming circuit suitable for a linear high-voltage LED driver; the dimming circuit comprises a rectifier bridge pile, at least two LED strings, a drive control IC, a drive switch, a PWM control switch and a PWM signal input terminal, wherein positive and negative poles of the two LED strings are mutually connected in series end to end; and the PWM control switch receives PWM signals, and controls disconnection-connection time percentage of the drive switch so as to adjust light-lightless time ratio of the LED strings, thereby finally obtaining a dimming purpose. The dimming circuit suitable for the linear high-voltage LED driver realizes dimming function of LED lighting fixture employing a linear high-voltage LED drive scheme.
Description
Technical field
The utility model belongs to the LED lighting technical field, is specifically related to a kind of light adjusting circuit of suitable linear low density led driver.
Background technology
Some companies have released a kind of employing linear low density led driver driving LED light fixture now, it needs to be no less than after the LED string of 2 sections series connection or series connection and the combination in parallel the LED of composition and goes here and there place in circuit in turn, to be added on the LED string through the pulsating voltage of over commutation then, measure the voltage of every section LED string of input by driving control chip at last, by the time input voltage reaches after the certain value, drives first section LED string of chip drives connection and constant current with lower current value; When arriving second section LED string of the later driving again of higher voltage connection and constant current in higher electric current; After waiting until that at last voltage is higher, connect the 3rd section LED string and constant current again in the electric current of higher value; When the voltage reduction is that process is just in time opposite.Adopt this linear low density led driver, improved the reliability of LED light fixture greatly, simplified production process, reduced production cost.But the LED light fixture of Switching Power Supply driving is still waiting to improve in the light modulation utility model relatively.
And the LED lamp brightness adjustment control that adopts the linear low density led driver at present generally adopts controllable silicon dimmer, and not only the low dimming effect of efficient is also poor.
The utility model content
The purpose of this utility model is to solve the defective that above-mentioned prior art exists, and a kind of light adjusting circuit that can regulate the suitable linear low density led driver of LED light by pwm signal is provided.
A kind of light adjusting circuit of suitable linear low density led driver, comprise the rectifier bridge heap, at least 2 sections LED strings that the head and the tail both positive and negative polarity is connected mutually, drive control IC, driving switch, the PWM control switch, the pwm signal input, the output head anode of described rectifier bridge heap connects the anodal of LED string and drives the power end VCC of control IC, the input that the negative pole of every section LED string is connected to corresponding driving switch respectively forms at least 2 road driving switch control circuits, the output of every road driving switch is connected to the corresponding current input that drives control IC respectively, the corresponding control output end that drives control IC is connected to the PWM control switch respectively, every road PWM control switch also is connected to the control end of corresponding driving switch respectively, the control end of all PWM control switchs is connected to the pwm signal input jointly, the earth terminal of described driving control IC and the negative pole of output end common ground of rectifier bridge heap;
Described LED string is that the LED that some LED or LED crystal grain are formed with the series connection form goes here and there or goes here and there with the LED that connects and combining form in parallel is formed;
Described drive IC is a kind of luminous LED drive integrated circult device of LED string of connecting mutually by at least 2 two sections head and the tail of voltage control both positive and negative polarity;
Described driving switch is by changing the conduction impedance that its control end voltage or electric current change its input and output;
The ratio of the high-low level of the PWM square-wave signal of described PWM control switch by importing its control end adjust the time ratio of driving switch break-make so that adjust the LED string luminous with fluorescent lifetime ratio not.
Further, described PWM square-wave signal is the square-wave signal of variable-width, and its frequency is not less than 100 hertz and be the even multiples of electric main frequency.
Further, described driving switch is NMOS pipe Q1, Q2, Q3, and described PWM control switch is NPN triode Q4, Q5, Q6; Rectifier bridge heap output head anode connects the anodal of first section LED string and drives the power end VCC of control IC, the negative pole of first section LED string connects the positive pole of second section LED string, the negative pole of second section LED string connects the positive pole of the 3rd section LED string, the negative pole of every section LED string meets corresponding NMOS pipe Q1, Q2, the drain electrode of Q3, each NMOS pipe Q1, Q2, the source electrode of Q3 meets the current input terminal S1 that drives control IC respectively, S2, S3, drive the control output end G1 of control IC correspondence, G2, G3 meets corresponding NMOS pipe Q4 respectively, Q5, the grid of Q6 and corresponding NPN triode Q1, Q2, the collector electrode of Q3, NPN triode Q1, Q2, the emitter of Q3 is connected to the earth terminal that drives control IC jointly, NPN triode Q1, Q2, the base stage of Q3 is connected to the pwm signal input jointly, the earth terminal of described driving control IC and rectifier bridge heap negative pole of output end common ground.
Further, described driving switch is NMOS pipe Q1, Q2, Q3, and described PWM control switch is NMOS pipe Q4, Q5, Q6; Rectifier bridge heap output head anode connects the anodal of first section LED string and drives the power end VCC of control IC, the negative pole of first section LED string connects the positive pole of second section LED string, the negative pole of second section LED string connects the positive pole of the 3rd section LED string, the negative pole of every section LED string meets corresponding NMOS pipe Q1, Q2, the drain electrode of Q3, each NMOS pipe Q1, Q2, the source electrode of Q3 meets the current input terminal S1 that drives control IC respectively, S2, S3, drive the control output end G1 of control IC correspondence, G2, G3 meets corresponding NMOS pipe Q1 respectively, Q2, the grid of Q3 and NMOS pipe Q4, Q5, the drain electrode of Q6, NMOS manages Q4, Q5, the source electrode of Q6 is connected to the earth terminal that drives control IC jointly, each NMOS pipe Q4, Q5, the grid of Q6 is connected to the pwm signal input jointly, the earth terminal of described driving control IC and rectifier bridge heap negative pole of output end common ground.
Further, described PWM control switch can also be PMOS pipe or PNP triode.
Further, described driving switch can also manage for PMOS, NPN triode or PNP triode.
The light adjusting circuit of the suitable linear low density led driver that the utility model provides, control the make-and-break time of each road driving switch of linear high-voltage LED driver by the pwm signal of the pwm signal input input that is connected simultaneously with each road PWM control switch, control the luminous and non-luminous time scale of LED string by the make-and-break time of controlling each road driving switch, and then reach the purpose of light modulation, solved the not good defective of LED illuminating product dimming effect of present use linear low density led driver.
Description of drawings
Fig. 1 is suitable for the light adjusting circuit structural representation of linear low density led driver for the utility model;
Fig. 2 is suitable for light adjusting circuit embodiment one electrical block diagram of linear low density led driver for the utility model;
Fig. 3 is suitable for light adjusting circuit embodiment two electrical block diagrams of linear low density led driver for the utility model;
Fig. 4 is voltage, the current waveform figure of the utility model LED string;
Fig. 5 is the oscillogram of the utility model pwm signal input input pwm signal;
Fig. 6 adds the current waveform figure of LED string behind the PWM dim signal for the utility model.
Description of reference numerals: 101-rectifier bridge heap, the 102-LED string, the 103-PWM control switch, 104-driving switch, 105-drive control IC, 106-PWM signal input part.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with the accompanying drawing in the utility model, technical scheme in the utility model is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
Fig. 1 is suitable for the light adjusting circuit structural representation of linear low density led driver for the utility model, as shown in Figure 1, the positive pole of rectifier bridge heap 101 meets first section LED and goes here and there 102 positive poles, and second section LED goes here and there 102 positive poles and connect the negative pole of first section LED string 102, and the connection of other LED lamps by that analogy; First PWM control switch 103 of the control termination of first driving switch 104, the negative pole of first section LED string 102 of the input termination of first driving switch 104, the output termination of first driving switch 104 drives the current input terminal of control IC105; Another current input terminal that the negative pole of second PWM control switch 103 of the control termination of second driving switch 104, second section LED string 102 of its input termination, output termination drive control IC105; The connection of other driving switchs by that analogy.
All-wave or half-wave rectifying circuit that rectifier bridge heap 101 of the present utility model is formed for the rectifier diode that civil power is become dc pulse moving voltage.
The LED of the present utility model string 102 LED string that be some LED or LED crystal grain form with the series connection form or the LED that forms with series connection and combining form in parallel go here and there, and the conducting voltage that LED goes here and there is than high many of conducting voltage single led or LED crystal grain.
Driving of the present utility model control IC105 is that a kind of LED that connects mutually by at least two sections head and the tail of voltage control both positive and negative polarity goes here and there 102 luminous LED drive integrated circult devices.Drive the luminance that control IC105 can adjust each section LED string according to the variation of input voltage.Then first section LED string is luminous when voltage drives the driving switch work conducting of first section LED string of control IC105 control when zero volt is elevated to the required voltage of first section LED string conducting, other LED string not conductings this moment; When voltage continues to be elevated to the required voltage of first section and the conducting simultaneously of second section LED string, the driving switch of first section LED string is closed in the driving switch conducting that drives second section LED string of control IC105 control simultaneously, thus because first period of this moment that first period and second section LED string are series connection and second section LED string are controlled by second section driving switch the while luminous; When voltage continues to be elevated to the required voltage of first section, second section and the conducting simultaneously of the 3rd section LED string again, drive driving switch conducting that control IC105 controls the 3rd section LED string and close the driving switch of first section, second section LED string simultaneously, so simultaneously luminous because first period, second period of this moment that first period, second period and the 3rd section LED string are series connection and the 3rd section LED ganged up the 3rd section driving switch control; If working method by that analogy when disposing more led light source.
Described PWM control switch 103 is drawn together a control end, and PWM control switch 103 is adjusted the time ratio of driving switch 104 break-makes by the ratio of the high-low level of PWM square-wave signal and then adjusted LED and go here and there 102 luminous and fluorescent lifetime ratios not.Described PWM control switch 103 is specifically as follows NMOS pipe, PMOS pipe, NPN triode or PNP triode.
Described pwm signal input 106 connects the control end of all PWM control switchs, and the pwm signal of importing pwm signal input 106 ports like this just can be controlled conducting and the shutoff of all driving switchs 104 simultaneously.
The course of work of the present utility model is to drive control IC105 to make at least two sections LED strings 102 luminous by the rule conducting according to the voltage control driving switch of importing 104, after the PWM dim signal was added to pwm signal input 106, pwm signal input 106 was connected with the control end of all PWM control switchs 103 simultaneously.PWM control switch 103 is in closed condition when the pwm signal of input is high level, and all driving switchs 104 turn-off (the LED string is not luminous); PWM control switch 103 is in opening state when pwm signal is low level, and all driving switchs 104 are subjected to drive IC 105 controls (the LED string is luminous by the control law that drives control IC105); So just can be by the high level of adjusting pwm signal and the time scale of shutoff and conducting that low level ratio is adjusted the LED driving switch, adjust the luminous and not luminous time scale of LED string by the shutoff of adjustment LED driving switch and the time scale of conducting, thereby reach the purpose of light modulation.Because the frequency of PWM dim signal is not less than 100 hertz, so human eye perceives is less than flash of light.
Go here and there 102 luminous processes as can be seen from driving LED that at least two sections head and the tail of control IC105 control both positive and negative polarities connect mutually, LED string 102 is luminous according to the Changing Pattern flicker of the dc pulse moving voltage of civil power after rectifier bridge is piled 101 rectifications, so because human eye has persistence of vision can not feel flicker.If but the frequency of PWM dim signal is not that the integer multiple of dc pulse moving voltage frequency just has tangible scintillation after the rectification.So PWM dim signal frequency of the present utility model is selected the even multiples of electric main frequency for use.
Preferably, the utility model is the square-wave signal of variable-width from the PWM square-wave signal of pwm signal input 106 inputs, its frequency is not less than 100 hertz, and be the even multiples of electric main frequency, the utility model is that the LED lamp does not glimmer in the light modulation process in order to make in this frequency of using pwm signal as the purpose of the even multiples of electric main frequency.
Fig. 2 is suitable for light adjusting circuit embodiment one electrical block diagram of linear low density led driver for the utility model; As shown in Figure 2, PWM control switch 103 is by NPN triode Q4, Q5, Q6 constitutes, described driving switch 104 is by NMOS pipe Q1, Q2, Q3 forms, rectifier bridge is piled the power end VCC that 101 output head anodes connect the anodal of first section LED string 102 and drive control IC105, the negative pole of first section LED string 102 connects the positive pole of second section LED string 102, the negative pole of second section LED string 102 connects the positive pole of the 3rd section LED string 102, the negative pole of every section LED string 102 meets corresponding NMOS pipe Q1, Q2, the drain electrode of Q3, each NMOS pipe Q1, Q2, the source electrode of Q3 meets the current input terminal S1 that drives control IC105 respectively, S2, S3, drive the control output end G1 of control IC105 correspondence, G2, G3 meets corresponding NMOS pipe Q1 respectively, Q2, the grid of Q3 and corresponding NPN triode Q4, Q5, the collector electrode of Q6, NPN triode Q4, Q5, the emitter of Q6 is connected to the earth terminal that drives control IC105 jointly, NPN triode Q4, Q5, the base stage of Q6 is connected to pwm signal input 106 jointly, and earth terminal and the rectifier bridge of described driving control IC105 are piled 101 negative pole of output end common grounds.
When pwm signal input 106 during for high level all NPN triode 103 saturation conductions then the control end level of all driving switchs 104 be forced to be locked as low level (less than 300 millivolts), driving switch 104 is the high resistant off state at this moment, and all LED strings are just not luminous yet; All NPN triodes 103 are not conducting of high resistant when pwm signal input 106 is low level, and then the control end level of all driving switchs 104 changes according to the level of drive IC 105 control output ends, and all LED strings are subjected to drive IC 105 controls luminous by rule.So just can adjust the time scale of driving switch shutoff and conducting by regulating pwm signal input high level and low level ratio, driving switch turn-offs and the time scale of conducting is adjusted the luminous and not luminous time scale of LED string by adjusting, and finally reaches the purpose of light modulation.
When pwm signal input 106 during for high level NMOS pipe Q4, Q5, Q6 saturation conduction then the control end level of all driving switch Q1, Q2, Q3 be forced to be locked as low level (less than 300 millivolts), driving switch Q1, Q2, Q3 are the high resistant off state at this moment, and all LED strings are just not luminous yet; All NMOS pipe Q4, Q5, Q6 are not conducting of high resistant when pwm signal input 106 is low level, then the control end level of all driving switch Q1, Q2, Q3 changes according to the level of drive IC 105 control output ends, and all LED strings are subjected to drive IC 105 controls luminous by rule.High level that so just can be by regulating pwm signal and low level ratio are adjusted driving switch and are turn-offed time scale with conducting, driving switch turn-offs and ON time is recently adjusted the luminous and not luminous time scale of LED string by adjusting, and finally reaches the purpose of light modulation.
Only for further specifying structure, usage and the characteristics of PWM light adjusting circuit, the utility model does not limit linear low density led driver circuit linear low density led driver circuit structure described in the utility model.
PWM light adjusting circuit described in the utility model can be used with linear low density LED drive IC and driving switch, also can be integrated in linear low density LED drive IC inside together with driving switch, and the utility model does not limit this.
Situation when being 3 sections with LED string among Fig. 2 or Fig. 3 embodiment is below set forth light modulation scheme of the present utility model in conjunction with voltage, the current waveform figure of LED string:
Fig. 4 is voltage, the current waveform figure of the utility model LED string; As shown in Figure 4, the LED crosstalk corrugating of measuring in rectifier bridge heap back is shown in 402, when not having light modulation or the current waveform of pwm signal input LED string when being constant low level shown in 401, behind output ripple voltage waveform after the rectification of voltage process rectifier bridge heap, because the control that drives control IC is arranged, the electric current of LED string can make LED go here and there that conducting piecemeal is luminous to be changed according to the voltage that raises gradually, and therefore the current waveform 401 of three steps has just been arranged.
Fig. 5 is the oscillogram of the utility model pwm signal input input pwm signal, and as shown in Figure 5, the high-low level ratio is 50%, frequency is that 500 hertz voltage waveform is shown in 403.
Fig. 6 adds the current waveform figure of LED string behind the PWM dim signal for the utility model, as shown in Figure 6, the voltage waveform of LED string is shown in 404 after the light modulation, in conjunction with Fig. 4 and Fig. 5, after adding the PWM dim signal, when the PMW signal of input was high level, the PWM control switch was in closed condition, then driving switch ends, and this moment, the LED string did not have electric current to flow through; When the PMW signal of input was low level, the PWM control switch was in conducting state, and then driving switch is subjected to drive IC 105 controls, and at this moment, the LED string can be luminous by control law, and therefore current waveform shown in Figure 6 404 has just been arranged.Current waveform 404 after light modulation can significantly be found out, when the pwm signal level is high level the electric current of LED string be zero do not have luminous, the electric current of LED string changes by the control law of drive IC 105 when the pwm signal level is low level, current waveform 404 step-like among Fig. 6 has namely been arranged, thereby the LED string is changed luminous average time, and then reached the purpose of adjusting LED string luminosity, therefore, the utility model just can be controlled the brightness of LED string by the ratio that changes high-low level in the pwm signal.
It should be noted that at last: above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although with reference to previous embodiment the utility model is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment puts down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (6)
1. the light adjusting circuit of a suitable linear low density led driver, it is characterized in that, comprise rectifier bridge heap (101), at least 2 sections LED strings (102) that the head and the tail both positive and negative polarity is connected mutually, drive control IC (105), driving switch (104), PWM control switch (103), pwm signal input (106), the output head anode of described rectifier bridge heap (101) connects the anodal of LED string (102) and drives the power end VCC of control IC (105), the input that the negative pole of every section LED string (102) is connected to corresponding driving switch (104) respectively forms at least 2 road driving switch control circuits, the output of every road driving switch (104) is connected to the corresponding current input that drives control IC (105) respectively, the corresponding control output end that drives control IC (105) is connected to PWM control switch (103) respectively, every road PWM control switch (103) also is connected to the control end of corresponding driving switch (104) respectively, the control end of all PWM control switchs (103) is connected to pwm signal input (106) jointly, the negative pole of output end common ground of the earth terminal of described driving control IC (105) and rectifier bridge heap (101);
Described LED string (102) the LED string that be some LED or LED crystal grain form with the series connection form or go here and there with the LED of series connection and combining form in parallel composition;
Described drive IC (105) is a kind of LED string (102) luminous LED drive integrated circult device of connecting mutually by at least 2 two sections head and the tail of voltage control both positive and negative polarity;
Described driving switch (104) is by changing the conduction impedance that its control end voltage or electric current change its input and output;
The ratio of the high-low level of the PWM square-wave signal of described PWM control switch (103) by importing its control end adjust the time ratio of driving switch (104) break-make so that adjust LED string (102) luminous with fluorescent lifetime ratio not.
2. light adjusting circuit according to claim 1 is characterized in that, described PWM square-wave signal is the square-wave signal of variable-width, and its frequency is not less than 100 hertz and be the even multiples of electric main frequency.
3. light adjusting circuit according to claim 1 and 2 is characterized in that, described driving switch (104) is NMOS pipe Q1, Q2, Q3, and described PWM control switch (103) is NPN triode Q4, Q5, Q6; Rectifier bridge heap (101) output head anode connects the anodal of first section LED string (102) and drives the power end VCC of control IC (105), the negative pole of first section LED string (102) connects the positive pole of second section LED string (102), the negative pole of second section LED string (102) connects the positive pole of the 3rd section LED string (102), the negative pole of every section LED string (102) meets corresponding NMOS pipe Q1, Q2, the drain electrode of Q3, each NMOS pipe Q1, Q2, the source electrode of Q3 meets the current input terminal S1 that drives control IC (105) respectively, S2, S3, drive the corresponding control output end G1 of control IC (105), G2, G3 meets corresponding NMOS pipe Q4 respectively, Q5, the grid of Q6 and corresponding NPN triode Q1, Q2, the collector electrode of Q3, NPN triode Q1, Q2, the emitter of Q3 is connected to the earth terminal that drives control IC (105) jointly, NPN triode Q1, Q2, the base stage of Q3 is connected to pwm signal input (106) jointly, the earth terminal of described driving control IC (105) and rectifier bridge heap (101) negative pole of output end common ground.
4. light adjusting circuit according to claim 1 and 2 is characterized in that, described driving switch (104) is NMOS pipe Q1, Q2, Q3, and described PWM control switch (103) is NMOS pipe Q4, Q5, Q6; Rectifier bridge heap (101) output head anode connects the anodal of first section LED string (102) and drives the power end VCC of control IC (105), the negative pole of first section LED string (102) connects the positive pole of second section LED string (102), the negative pole of second section LED string (102) connects the positive pole of the 3rd section LED string (102), the negative pole of every section LED string (102) meets corresponding NMOS pipe Q1, Q2, the drain electrode of Q3, each NMOS pipe Q1, Q2, the source electrode of Q3 meets the current input terminal S1 that drives control IC (105) respectively, S2, S3, drive the corresponding control output end G1 of control IC (105), G2, G3 meets corresponding NMOS pipe Q1 respectively, Q2, the grid of Q3 and NMOS pipe Q4, Q5, the drain electrode of Q6, NMOS manages Q4, Q5, the source electrode of Q6 is connected to the earth terminal that drives control IC (105) jointly, each NMOS pipe Q4, Q5, the grid of Q6 is connected to pwm signal input (106) jointly, the earth terminal of described driving control IC (105) and rectifier bridge heap (101) negative pole of output end common ground.
5. light adjusting circuit according to claim 1 and 2 is characterized in that, described PWM control switch (103) can also be PMOS pipe or PNP triode.
6. light adjusting circuit according to claim 1 and 2 is characterized in that, described driving switch (104) can also be managed for PMOS, NPN triode or PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320021348XU CN203136246U (en) | 2013-01-16 | 2013-01-16 | Dimming circuit suitable for linear high-voltage LED driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320021348XU CN203136246U (en) | 2013-01-16 | 2013-01-16 | Dimming circuit suitable for linear high-voltage LED driver |
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| CN203136246U true CN203136246U (en) | 2013-08-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320021348XU Withdrawn - After Issue CN203136246U (en) | 2013-01-16 | 2013-01-16 | Dimming circuit suitable for linear high-voltage LED driver |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929845A (en) * | 2013-01-16 | 2014-07-16 | 陕西亚成微电子股份有限公司 | Light dimming circuit suitable for linear high-voltage LED driver |
| CN106455209A (en) * | 2016-09-30 | 2017-02-22 | 深圳Tcl数字技术有限公司 | Dimming interface circuit and alternating current driving circuit |
-
2013
- 2013-01-16 CN CN201320021348XU patent/CN203136246U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103929845A (en) * | 2013-01-16 | 2014-07-16 | 陕西亚成微电子股份有限公司 | Light dimming circuit suitable for linear high-voltage LED driver |
| CN103929845B (en) * | 2013-01-16 | 2016-06-29 | 陕西亚成微电子股份有限公司 | It is suitable for the light adjusting circuit of linear low density LED driver |
| CN106455209A (en) * | 2016-09-30 | 2017-02-22 | 深圳Tcl数字技术有限公司 | Dimming interface circuit and alternating current driving circuit |
| CN106455209B (en) * | 2016-09-30 | 2018-12-07 | 深圳Tcl数字技术有限公司 | Dimming interface circuit and AC driving circuit |
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| C14 | Grant of patent or utility model | ||
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| AV01 | Patent right actively abandoned |
Granted publication date: 20130814 Effective date of abandoning: 20160629 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |