CN107027220A - A kind of Dimmable LED drive circuit - Google Patents
A kind of Dimmable LED drive circuit Download PDFInfo
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- CN107027220A CN107027220A CN201710311574.4A CN201710311574A CN107027220A CN 107027220 A CN107027220 A CN 107027220A CN 201710311574 A CN201710311574 A CN 201710311574A CN 107027220 A CN107027220 A CN 107027220A
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- constant current
- resistant
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- pressure
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- 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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
A kind of Dimmable LED drive circuit, belongs to technical field of semiconductors.Including thyristor regulating optical module, constant current rectification module, power factor correction module, filtration module and circuit protection module; thyristor regulating optical module changes conducting delay and angle of flow size by changing light adjusting potentiometer RW resistances; so that the current duty cycle for flowing through LED changes, so as to influence LED brightness；The structure of traditional LED drive circuit is simplified by the constant current rectification module that pressure-resistant constant current device is constituted high reversely, rectification function and constant current function is combined, LED string is driven without adding other discrete constant current devices directly to connect civil power；Prevent that the electric current for flowing through LED is excessive using high molecular positive temp thermistor PPTC, piezo-resistance Rv protects LED string not damaged because of high voltage transient.Rectification, constant current and dimming function are combined together by the present invention, simplify the structure of drive circuit, and the miniaturization of drive system can be achieved, cost is reduced.
Description
Technical field
The invention belongs to technical field of semiconductors, and in particular to a kind of Dimmable LED drive circuit.
Background technology
Constant-current source is a kind of conventional electronic equipment and device, mainly for the protection of whole circuit, even if there is voltage not
The situation of stable or load resistance change very greatly, can ensure the stabilization of supply current, constant-current source is extensive in electronic circuit
Using such as driving of LED string.Traditional LED illumination driving it is general by rectifier bridge add (or multiple) constant current chip or
Constant current device is constituted, and constant current device is usually a kind of constant current device of similar JFET jfet structures, with double
To the characteristics of conducting, i.e., the effect of constant current, the leading similar to general-purpose diode in reverse operation are can reach in forward direction work
Logical mode, with higher electric current.During work, AC alternating current input rectifying bridges, then capacitor filtering is converted into direct current after filtering
Electricity, then connect constant current chip or constant current device (such as current regulator diode), reaches the effect of constant current output, so as to drive LED
Lamp string.
(the A vertical current regulator diode with trench cathode such as Yitao He
based on double epitaxial layers for LED lighting,Yitao He,Power
Semiconductor Devices＆IC's (ISPSD), 2015IEEE 27th International Symposium on,
Page(s):157-160,10-14May 2015) a kind of LED illumination drive system is proposed, as shown in figure 1, the LED illumination is driven
Dynamic system includes rectification filtering module and constant current chip two parts, and rectification filtering module is by rectifier bridge and a filter capacitor structure
Into constant current chip is any two end constant current device.The LED illumination drive system includes rectification and constant current two parts, and structure is more multiple
It is miscellaneous, and the drive system easily produces instantaneous pressure surge, without high current protective capability, easily burns LED.
The content of the invention
A kind of defect that the present invention exists for background technology, it is proposed that Dimmable LED drive circuit, increases thyristor regulating
Optical module and voltage protection module, constant current and rectification function are combined together so that LED driving is more simple and reliable, can be real
The miniaturization of existing drive system, and reduce further cost.
Technical scheme is as follows：
A kind of LED drive circuit, including thyristor regulating optical module, constant current rectification module, power factor correction module, filtering
Module and circuit protection module,
The constant current rectification module includes the first high reversely pressure-resistant constant current device D2, the second high reversely pressure-resistant constant current device
D3, the 3rd high high reversely pressure-resistant constant current device D5 of reversely pressure-resistant constant current device D4 and the 4th, the 3rd high reversely pressure-resistant constant current device
The high reversely pressure-resistant constant current device D5 of D4 and the 4th anode interconnects and is used as the first output end of the constant current rectification module, the 3rd
High reversely pressure-resistant constant current device D4 negative electrode connects the first high reversely pressure-resistant constant current device D2 anode and as the constant current rectification
Thyristor regulating optical module is set before the first input end of module, the first input end of the constant current rectification module, and the 4th is high reverse
Pressure-resistant constant current device D5 negative electrode connects the second high reversely pressure-resistant constant current device D3 anode and as the constant current rectification module
Second input, the first high high reversely pressure-resistant constant current device D3 of reversely pressure-resistant constant current device D2 and second negative electrode interconnection and conduct
Second output end of the constant current rectification module；
The power factor correction module includes the second electric capacity C2, the 3rd electric capacity C3, the first diode D6, the second diode
D7 and the 3rd diode D8, the 3rd diode D8 of second electric capacity C2 one end connection negative electrode and the second of the constant current rectification module
DC output end, the other end connects the first diode D6 negative electrode and the second diode D7 anode, the 3rd electric capacity C3 one end
The first diode D6 anode and the first DC output end of the constant current rectification module are connected, the other end connects the second diode
The anode of D7 negative electrode and the 3rd diode D8；
The filtration module include being connected on the DC output end of constant current rectification module first and the second DC output end it
Between the 4th electric capacity C4 and the 5th electric capacity C5 in parallel；
The circuit protection module includes high molecular positive temp thermistor PPTC and piezo-resistance Rv, high molecular positive temp temperature-sensitive
Second DC output end of a resistance PPTC termination constant current rectification module, its other end is followed by institute by piezo-resistance Rv
State the first DC output end of constant current rectification module.
Specifically, the thyristor regulating optical module includes light adjusting potentiometer RW, resistance R1, the first electric capacity C1, two-way triggering
Diode D1 and bidirectional triode thyristor VS1,
Light adjusting potentiometer RW one end is connected with the bidirectional triode thyristor VS1 first anode and as the thyristor regulating optical module
Input, the other end passes through one end that electric capacity C1 is connected after resistance R1 and bidirectional trigger diode D1 one end, two-way triggering
Diode D1 other end connection bidirectional triode thyristor VS1 control end, the of electric capacity C1 other end connection bidirectional triode thyristor VS1
Two anodes simultaneously connect the first input end of the constant current rectification module as the output end of the thyristor regulating optical module.
Specifically, the first input end and the second input of the constant current rectification module are ac input end.
Specifically, the first input end and the second input of the constant current rectification module are direct-flow input end.
Specifically, being the characteristics of the high reversely pressure-resistant constant current device：When forward voltage is more than pinch-off voltage, its electric current
Keep constant；When applying backward voltage, device is held off, and with high pressure-resistant.
Specifically, the described first high reversely pressure-resistant constant current device D2, the second high reversely pressure-resistant constant current device D3, the 3rd height are anti-
It is the high reversely pressure-resistant constant current device in mutually isostructural two end to the high reversely pressure-resistant constant current device D5 of pressure-resistant constant current device D4 and the 4th.
Specifically, the described first high reversely pressure-resistant constant current device D2, the second high reversely pressure-resistant constant current device D3, the 3rd height are anti-
To two ends high reversely pressure-resistant constant current devices of the high reversely pressure-resistant constant current device D5 of pressure-resistant constant current device D4 and the 4th for different structure.
First output and second output end two ends, direct current or friendship of the LED connection in series-parallel in the constant current rectification module
Stream electricity is connected between the second input of the input of the thyristor regulating optical module and the constant current rectification module.
The characteristics of high molecular positive temp thermistor PPTC is：When running current passes through high molecular positive temp thermistor
During PPTC, high molecular positive temp thermistor PPTC is in low resistive state；When have in circuit abnormal overcurrent by when, high molecular positive temp
Thermistor PPTC is in high-impedance state；After overcurrent disappears in circuit, polymer cooling, volume recovers normal, and macromolecule is just
Warm thermistor PPTC is in initial low resistive state again.
The characteristics of piezo-resistance Rv is：When there is high voltage transient to pass through, piezo-resistance Rv has electric current to flow through in low resistance state, when
Piezo-resistance Rv flows through in high-impedance state no current when voltage is normal.
Beneficial effects of the present invention are：The present invention adds dimming function using thyristor regulating optical module, is adjusted by changing
Photopotential device RW resistances change angle of flow size so that the dutycycle for flowing through LED electric current becomes so as to change conducting delay
Change, so that LED brightness is influenceed, and also bidirectional triode thyristor VS1 is easy to use, and dimming scope is wide；By high reversely pressure-resistant galvanostat
The New LED constant current driving of part composition simplifies the structure of traditional LED illumination drive circuit, makes rectification function and constant current function knot
Be combined together, without add other discrete constant current devices can directly external civil power drive LED string；Use high molecular positive temp heat
Quick resistance PPTC and piezo-resistance Rv realizes overcurrent protection and overvoltage protection, and certain protection is served in LED operation and is made
With.
Brief description of the drawings
A kind of structural representation for LED illumination drive system that Fig. 1 provides for background technology；
The internal structure for the Dimmable LED constant current driving that Fig. 2 provides for the present invention；
The output voltage wave figure that Fig. 3 is bidirectional triode thyristor VS1 in thyristor regulating optical module of the present invention；
Fig. 4 for the present invention in height reversely pressure-resistant constant current device I-V characteristic curve map；
Fig. 5 is overvoltage protection schematic diagram in circuit protection module of the present invention；
Fig. 6 is the high reversely pressure-resistant constant current device structure chart of one kind in embodiment.
Embodiment
With reference to specific embodiments and the drawings, the present invention is described in detail.
It is illustrated in figure 2 the specific schematic diagram of LED drive circuit proposed by the present invention, including controllable silicon light modulation module I, perseverance
Flow rectification module II, power factor correction module III, filtration module IV and circuit protection module V.Thyristor regulating in the present embodiment
A kind of circuit implementations of optical module I are, including light adjusting potentiometer RW, resistance R1, the first electric capacity C1, bidirectional trigger diode
D1 and bidirectional triode thyristor VS1, light adjusting potentiometer RW one end is connected with the bidirectional triode thyristor VS1 first anode and as described controllable
The input of silicon light-adjusting module, the other end by connected after resistance R1 electric capacity C1 one end and bidirectional trigger diode D1 one
End, bidirectional trigger diode D1 other end connection bidirectional triode thyristor VS1 control end, electric capacity C1 other end connection is two-way can
Control silicon VS1 second plate and connect the first defeated of the constant current rectification module as the output end of the thyristor regulating optical module
Enter end.
The constant current rectification module includes the first high reversely pressure-resistant constant current device D2, the second high reversely pressure-resistant constant current device
D3, the 3rd high high reversely pressure-resistant constant current device D5 of reversely pressure-resistant constant current device D4 and the 4th, the 3rd high reversely pressure-resistant constant current device
The high reversely pressure-resistant constant current device D5 of D4 and the 4th anode interconnects and is used as the first output end of the constant current rectification module, the 3rd
High reversely pressure-resistant constant current device D4 negative electrode connects the first high reversely pressure-resistant constant current device D2 anode and as the constant current rectification
Thyristor regulating optical module is set before the first input end of module, the first input end of the constant current rectification module, and the 4th is high reverse
Pressure-resistant constant current device D5 negative electrode connects the second high reversely pressure-resistant constant current device D3 anode and as the constant current rectification module
Second input, the first high high reversely pressure-resistant constant current device D3 of reversely pressure-resistant constant current device D2 and second negative electrode interconnection and conduct
Second output end of the constant current rectification module.
Further, the described first high reversely pressure-resistant constant current device D2, the second high reversely pressure-resistant constant current device D3, the 3rd high
The characteristics of high reversely pressure-resistant constant current device D5 of reverse pressure-resistant constant current device D4 and the 4th is：When forward voltage is more than pinch-off voltage
When, its constant current hold；When applying backward voltage, device is held off, and with high pressure-resistant.
Further, the described first high reversely pressure-resistant constant current device D2, the second high reversely pressure-resistant constant current device D3, the 3rd high
The high reversely pressure-resistant constant current device D5 of reverse pressure-resistant constant current device D4 and the 4th are the high reversely pressure-resistant galvanostat in mutually isostructural two end
Part, or the high reversely pressure-resistant constant current device in two ends of different structure.
Further, the first input end and the second input of the constant current rectification module can be ac input end,
It can be direct-flow input end.
The power factor correction module is by the second electric capacity C2, the 3rd electric capacity C3, the first diode D6, the second diode
The valley fill type Passive Power factor correction circuit of D7 and the 3rd diode D8 compositions, second electric capacity C2 one end connects the 3rd diode
Second DC output end of D8 negative electrode and the constant current rectification module, the other end connects the first diode D6 negative electrode and second
Diode D7 anode, the 3rd electric capacity C3 the first diode D6 of one end connection anode and the first of the constant current rectification module
DC output end, the other end connects the second diode D7 negative electrode and the 3rd diode D8 anode；The filtration module includes
It is connected on the 4th electric capacity C4 and the 5th in parallel between the DC output end of constant current rectification module first and the second DC output end
Electric capacity C5.
The circuit protection module includes high molecular positive temp thermistor PPTC and piezo-resistance Rv, high molecular positive temp temperature-sensitive
Second DC output end of a resistance PPTC termination constant current rectification module, its other end is followed by institute by piezo-resistance Rv
State the first DC output end of constant current rectification module.
Further, it is the characteristics of the high molecular positive temp thermistor PPTC：When running current is by PPTC,
PPTC is in low resistive state；When have in circuit abnormal overcurrent by when, PPTC be in high-impedance state；When overcurrent disappears in circuit
Afterwards, polymer is cooled down, and volume recovers normal, and PPTC is in initial low resistive state again.
High molecular positive temp thermistor PPTC prevents the electric current for flowing through LED excessive as overcurrent protection, piezo-resistance Rv
LED string is protected not damaged because of high voltage transient as overvoltage protection.
The present embodiment uses 220V electric main, and operation principle is：
The input of thyristor regulating optical module and the second input termination civil power 220V alternating currents of constant current rectification module, signal
During by thyristor regulating optical module, through light adjusting potentiometer RW, resistance R1Even load is to the first electric capacity C1Charged, when the first electricity
Hold C1Both end voltage reaches bidirectional trigger diode D1Conducting voltage when, bidirectional trigger diode D1Conducting, bidirectional triode thyristor
VS1 is also switched on.As shown in figure 3, output has certain conducting delay (delay), now output signal is the forward position per the half period
The removed copped wave of waveform.Signal is transmitted to constant current rectification module, by the rectified action and high reversely pressure-resistant constant current of rectifier bridge
Device constant current effect obtains constant DC signal.Power factor correction module has increased considerably whole in rectification constant flow module simultaneously
The angle of flow of flow tube, improves power factor.Signal module after filtering, is smoothly exported using capacitor charge and discharge principle
DC voltage, and make the reliable and stable work of the LED string of rear class.In circuit protection module, high molecular positive temp thermistor
PPTC provides overcurrent protection, and piezo-resistance Rv provides overvoltage protection.As shown in figure 5, when under normal working voltage, it is pressure-sensitive
Resistance Rv is in high-impedance state, when the voltage is greater than a threshold voltage, and piezo-resistance Rv will embody its clamping performance, and electric current drastically increases
Greatly so that electric current hardly flows through from LED, too high voltage pull-down, so as to reach overvoltage protection.These elements ensure that
LED is not because of electric current, voltage is excessive and damages, and can stablize the work of safety.In summary, in additional alternating current, LED string
On the electric current that flows through can be consistent, so as to lightening LED lamp string always.During LED string normal work, when lamp string two ends electricity
When pressure is less than startup voltage, LED cut-off no currents pass through, and start voltage when both end voltage is more than, LED lights, and pass through
Electric current is certain value, so current waveform is the square wave for having certain dutycycle.Light adjusting potentiometer in regulation light-adjusting module
RW, that is, the potentiometer resistance of access circuit is changed, so as to change conducting delay, angle of flow size is changed so that flow through
The dutycycle of LED electric current changes, and changes the size of average output current so as to have impact on LED brightness, reaches
The effect of light modulation.
Embodiment
In the present embodiment, the first high reversely pressure-resistant constant current device D2, the second high reversely pressure-resistant constant current device D3, the 3rd height are anti-
It is the high reversely pressure-resistant constant current device of identical to the high reversely pressure-resistant constant current device D5 of pressure-resistant constant current device D4 and the 4th.It is described high anti-
To the structural representation of pressure-resistant constant current device as shown in fig. 6, substrate 2 is lightly doped including p-type, it is lightly doped positioned at p-type on substrate 2
N-type lightly doped epitaxial layer 3, the diffusion P type trap zone 4 among N-type lightly doped epitaxial layer 3, it is described diffusion P type trap zone 4 be
Two and positioned at two ends, p-type heavily doped region 5 and N-type heavily doped region 7 among diffusion P type trap zone 4, positioned at N-type heavy doping
The deplection type channel area 6 of between area 7 and N-type lightly doped epitaxial layer 3 and embedded diffusion P type trap zone 4 upper surface, gently mixes positioned at N-type
Miscellaneous epitaxial layer 3 and the oxide layer 10 of the upper surface of deplection type channel area 6, cover the metallic cathode 9 of whole upper surface, light positioned at p-type
The metal anode 8 of the lower surface of doped substrate 2, the p-type heavily doped region 5, N-type heavily doped region 7 and the formation ohm of metallic cathode 9 connect
Touch.
One of ordinary skill in the art can make various do not depart from originally according to these technical inspirations disclosed by the invention
The other various specific deformations and combination of essence are invented, these deformations and combination are still within the scope of the present invention.
Claims (7)
1. a kind of Dimmable LED drive circuit, it is characterised in that including thyristor regulating optical module, constant current rectification module, power because
Plain correction module, filtration module and circuit protection module,
The constant current rectification module includes the first high reversely pressure-resistant constant current device (D2), the second high reversely pressure-resistant constant current device
(D3), the 3rd high reversely pressure-resistant constant current device (D4) and the 4th high reversely pressure-resistant constant current device (D5), the 3rd high reversely pressure-resistant perseverance
The anode interconnection of stream device (D4) and the 4th high reversely pressure-resistant constant current device (D5) is simultaneously used as the first of the constant current rectification module
Output end, the negative electrode of the 3rd high reversely pressure-resistant constant current device (D4) connects the anode and work of the first high reversely pressure-resistant constant current device (D2)
For the first input end of the constant current rectification module, thyristor regulating optical mode is set before the first input end of the constant current rectification module
Block, the negative electrode of the 4th high reversely pressure-resistant constant current device (D5) connects the second high reversely anode of pressure-resistant constant current device (D3) and as institute
State the second input of constant current rectification module, the first high reversely pressure-resistant constant current device (D2) and the second high reversely pressure-resistant constant current device
(D3) negative electrode interconnects and is used as the second output end of the constant current rectification module；
The power factor correction module includes the second electric capacity (C2), the 3rd electric capacity (C3), the first diode (D6), the two or two pole
(D7) and the 3rd diode (D8) are managed, the second electric capacity (C2) one end connects the negative electrode of the 3rd diode (D8) and the constant current rectification
Second DC output end of module, the other end connects the negative electrode of the first diode (D6) and the anode of the second diode (D7), the
One end of three electric capacity (C3) connects the anode of the first diode (D6) and the first DC output end of the constant current rectification module, separately
One end connects the negative electrode of the second diode (D7) and the anode of the 3rd diode (D8)；
The filtration module includes being connected between the DC output end of constant current rectification module first and second DC output end
4th electric capacity (C4) and the 5th electric capacity (C5) in parallel；
The circuit protection module includes high molecular positive temp thermistor (PPTC) and piezo-resistance (RV), high molecular positive temp temperature-sensitive
Second DC output end of the one termination constant current rectification module of resistance (PPTC), after its other end is by piezo-resistance (RV)
Connect the first DC output end of the constant current rectification module.
2. Dimmable LED drive circuit according to claim 1, it is characterised in that the thyristor regulating optical module includes
Light adjusting potentiometer (RW), resistance (R1), the first electric capacity (C1), bidirectional trigger diode (D1) and bidirectional triode thyristor (VS1), light modulation
Potentiometer (RW) one end is connected with the first anode of bidirectional triode thyristor (VS1) and as the input of the thyristor regulating optical module
End, the other end connects one end of electric capacity (C1) and one end of bidirectional trigger diode (D1), two-way triggering by resistance (R1) afterwards
The control end of the other end connection bidirectional triode thyristor (VS1) of diode (D1), the other end connection bidirectional triode thyristor of electric capacity (C1)
(VS1) the first input of second plate and the output end connection constant current rectification module as the thyristor regulating optical module
End.
3. Dimmable LED drive circuit according to claim 1, it is characterised in that the first of the constant current rectification module
Input and the second input are ac input end.
4. Dimmable LED drive circuit according to claim 1, it is characterised in that the first of the constant current rectification module
Input and the second input are direct-flow input end.
5. Dimmable LED drive circuit according to claim 1, it is characterised in that the high reversely pressure-resistant constant current device
The characteristics of be：When forward voltage is more than pinch-off voltage, its constant current hold；When applying backward voltage, device keeps closing
It is disconnected, and with high pressure-resistant.
6. Dimmable LED drive circuit according to claim 1, it is characterised in that the described first high reversely pressure-resistant constant current
Device (D2), the second high reversely pressure-resistant constant current device (D3), the 3rd high reversely pressure-resistant constant current device (D4) and the 4th are high reversely resistance to
It is the high reversely pressure-resistant constant current device in mutually isostructural two end to press constant current device (D5).
7. Dimmable LED drive circuit according to claim 1, it is characterised in that the described first high reversely pressure-resistant constant current
Device (D2), the second high reversely pressure-resistant constant current device (D3), the 3rd high reversely pressure-resistant constant current device (D4) and the 4th are high reversely resistance to
It is the high reversely pressure-resistant constant current device in two ends of different structure to press constant current device (D5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710311574.4A CN107027220A (en) | 2017-05-05 | 2017-05-05 | A kind of Dimmable LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710311574.4A CN107027220A (en) | 2017-05-05 | 2017-05-05 | A kind of Dimmable LED drive circuit |
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| CN107027220A true CN107027220A (en) | 2017-08-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110312339A (en) * | 2019-05-23 | 2019-10-08 | 鹰潭阳光照明有限公司 | A kind of LED lamp circuit of tunable optical |
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| CN203104912U (en) * | 2013-03-09 | 2013-07-31 | 张新安 | Light-emitting diode (LED) lamp driving power supply by employing silicon controlled dimming |
| CN105072765A (en) * | 2015-08-20 | 2015-11-18 | 电子科技大学 | Bridge type LED constant-current drive chip |
| CN105101555A (en) * | 2015-08-20 | 2015-11-25 | 电子科技大学 | LED constant current driving chip |
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- 2017-05-05 CN CN201710311574.4A patent/CN107027220A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202282601U (en) * | 2011-11-12 | 2012-06-20 | 袁毅 | Protection circuit combining high-polymer phenylthiocarbamide (PTC) thermistor and piezoresistor |
| CN203104912U (en) * | 2013-03-09 | 2013-07-31 | 张新安 | Light-emitting diode (LED) lamp driving power supply by employing silicon controlled dimming |
| CN105072765A (en) * | 2015-08-20 | 2015-11-18 | 电子科技大学 | Bridge type LED constant-current drive chip |
| CN105101555A (en) * | 2015-08-20 | 2015-11-25 | 电子科技大学 | LED constant current driving chip |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110312339A (en) * | 2019-05-23 | 2019-10-08 | 鹰潭阳光照明有限公司 | A kind of LED lamp circuit of tunable optical |
| CN110312339B (en) * | 2019-05-23 | 2021-04-20 | 鹰潭阳光照明有限公司 | Light-adjustable LED lamp circuit |
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Application publication date: 20170808 |