CN110035587A - A kind of high power factor LED drive circuit simplified and its implementation - Google Patents
A kind of high power factor LED drive circuit simplified and its implementation Download PDFInfo
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- CN110035587A CN110035587A CN201910421735.4A CN201910421735A CN110035587A CN 110035587 A CN110035587 A CN 110035587A CN 201910421735 A CN201910421735 A CN 201910421735A CN 110035587 A CN110035587 A CN 110035587A
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Classifications
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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]
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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
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The invention discloses a kind of high power factor LED drive circuits simplified; including safety protective circuit A; safety protective circuit A is connect with surge protection and rectification circuit B; surge protection and rectification circuit B are connect with filter circuit C; filter circuit C is connect with core work circuit H; core work circuit H is internally connected with overvoltage crowbar F or core work circuit H is internally connected with overvoltage crowbar F and electromagnetic compatibility circuit E；The invention also discloses a kind of implementation methods of high power factor LED drive circuit simplified；Surge protection and rectification module are adjusted by the frame structure of rectifier bridge stack and pressure-sensitive or TVS device are integrated into inside rectifier bridge by the patent device led in the present invention using cooperation supplier Shandong crystalline substance, and two modules of two original rectifications and antisurge function are combined into one by the present invention.
Description
Technical field
The invention belongs to LED drive circuit technical fields, and in particular to a kind of high power factor LED drive circuit simplified
And its implementation.
Background technique
The general nature of illuminating industry is made the transition from traditional lighting to LED illumination in recent years, is sent out by the high speed of more than ten years
Exhibition, LED illumination product gradually substitute traditional lighting products.Due to the fast lifting of LED illumination product cost.In and
State as the whole world electric light source major production base, make from scheme, exploitation, supply chain, processing and manufacturing, packing and selling hang down
Gradually accomplish ultimate attainment in straight integration, Hengdian Group obtains large-scale manufacturing enterprise of nation's illumination as electric light source class, vertical
That does in integration is especially prominent, wherein introduce herein it is a kind of based on periphery reduction Idear and semiconductor supplier develop jointly
LED high power factor (HPF) simplifies circuit.
High power factor (HPF) scheme as shown 1 currently more simplified on the market, corresponding module are divided with reference to figure
2, include protection circuit (A: safeguard protection and antisurge protection), rectification circuit (B), filter circuit (C), anti-surge protection circuit
(D), function of tonic chord Buck circuit (H), EMC improve complementary module (E), OVP overvoltage protective module (F), IC power supply module (G), defeated
Current error control circuit (I) out, this is essentially more popular scaled-down version high power factor (HPF) the driving electricity of Vehicles Collected from Market
Source, but there are still structure is complicated, device is various, the problem of leading to high production cost.
Summary of the invention
The purpose of the present invention is to provide a kind of high power factor LED drive circuits simplified, to solve above-mentioned background skill
The problem of being proposed in art.A kind of high power factor LED drive circuit simplified provided by the invention, having can simplify reducer
The characteristics of part is to reduce production cost.
Another object of the present invention is to provide a kind of implementation method of high power factor LED drive circuit simplified.
To achieve the above object, the invention provides the following technical scheme: a kind of high power factor LED driving electricity simplified
Road, including safety protective circuit A, safety protective circuit A are connect with surge protection and rectification circuit B, surge protection and rectified current
Road B is connect with filter circuit C, and filter circuit C is connect with core work circuit H, and core work circuit H is internally connected with over-voltage guarantor
Protection circuit F or core work circuit H are internally connected with overvoltage crowbar F and electromagnetic compatibility circuit E.
In the present invention further, the safety protective circuit A includes fuse resistance F1, and the one of fuse resistance F1
End is connect with firewire L, and the other end is connect with surge protection and rectification circuit B.
In the present invention further, the surge protection and rectification circuit B include antisurge rectifier bridge stack BD1, anti-wave
4 feet for gushing rectifier bridge stack BD1 connect the other end of fuse resistance F1, and 3 feet of antisurge rectifier bridge stack BD1 are grounded, and antisurge is whole
2 feet of stream bridge heap BD1 meet zero curve N, and 1 foot of antisurge rectifier bridge stack BD1 meets filter circuit C.
In the present invention further, diode is also connected on 2 feet and 4 feet of the antisurge rectifier bridge stack BD1
TVS。
In the present invention further, the filter circuit C includes inductance L1, capacitor C1 and capacitor C2, wherein inductance L1
One end connect with 1 foot of antisurge rectifier bridge stack BD1, the other end of inductance L1 is connect with core work circuit H, inductance L1 with
One end of the 1 foot connection of antisurge rectifier bridge stack BD1 is connected with capacitor C1, the other end ground connection of capacitor C1, inductance L1 and core
One end of operating circuit H connection is connected with capacitor C2, the other end ground connection of capacitor C2.
In the present invention further, the core work circuit H includes chip U1, wherein 4 feet of chip U1 connect electricity
Feel one end of L1,3 feet of chip U1 are hanging, and the 2 feet ground connection of chip U1,1 foot of chip U1 connects overvoltage crowbar F, chip
7 feet of U1 are connected with resistance R1, and the other end ground connection of resistance R1, the both ends of resistance R1 are parallel with resistance R2, the 5 of chip U1 and 6
Foot is connect with one end of diode D1 and inductance T1, and the other end of diode D1 connects with 4 feet of chip U1 and the end LED+ respectively
It connects, the other end of inductance T1 is connect with the end LED-, and capacitor C3 and resistance R4 are also respectively connected between the end LED+ and the end LED-.
In the present invention further, the overvoltage crowbar F includes resistance R3, and one end of resistance R3 is with chip U1's
The connection of 1 foot, the other end ground connection of resistance R3.
In the present invention further, the electromagnetic compatibility circuit E includes capacitor C4, and one end and the end LED- of capacitor C4 connects
It connects, the other end of capacitor C4 is connect with the ground terminal of resistance R1.
In the present invention further, the implementation method of the high power factor LED drive circuit simplified, including with
Lower step:
(1), using fuse resistance F1 as security protection module；
(2), surge protection and rectification module are used as using antisurge rectifier bridge stack BD1 and diode TVS cooperation；
(3), electromagnetic compatibility processing module is done as pi type filter using inductance L1, capacitor C1 and capacitor C2 cooperation；
(4), using resistance R1, resistance R2, resistance R3, resistance R4, diode D1, inductance T1, capacitor C3 and chip U1
Cooperate the core work module as Buck topology；
(5), wherein, resistance R3 cooperates chip U1 to do overvoltage protection processing, and capacitor C4 makees at the radiation reply of electromagnetic compatibility
Reason.
In the present invention further, the implementation method of the high power factor LED drive circuit simplified, safety are protected
Protection circuit A includes fuse resistance F1, and one end of fuse resistance F1 is connect with firewire L, the other end and surge protection and rectification
Circuit B connection；Surge protection and rectification circuit B include antisurge rectifier bridge stack BD1, and 4 feet of antisurge rectifier bridge stack BD1 meet guarantor
The other end of dangerous silk resistance F1, the 3 feet ground connection of antisurge rectifier bridge stack BD1,2 feet of antisurge rectifier bridge stack BD1 meet zero curve N,
1 foot of antisurge rectifier bridge stack BD1 meets filter circuit C；Diode is also connected on 2 feet and 4 feet of antisurge rectifier bridge stack BD1
TVS；Filter circuit C includes inductance L1, capacitor C1 and capacitor C2, wherein one end of inductance L1 is with antisurge rectifier bridge stack BD1's
The connection of 1 foot, the other end of inductance L1 are connect with core work circuit H, and inductance L1 is connect with 1 foot of antisurge rectifier bridge stack BD1
One end be connected with capacitor C1, the other end ground connection of capacitor C1, inductance L1 is connected with electricity with the one end connecting core work circuit H
Hold C2, the other end ground connection of capacitor C2；Core work circuit H includes chip U1, wherein the 4 feet connection inductance L1's of chip U1
3 feet of one end, chip U1 are hanging, and the 2 feet ground connection of chip U1,1 foot of chip U1 connects overvoltage crowbar F, 7 feet of chip U1
It is connected with resistance R1, the other end ground connection of resistance R1, the both ends of resistance R1 are parallel with resistance R2, and 5 and 6 feet of chip U1 are with two
Pole pipe D1 is connected with one end of inductance T1, and the other end of diode D1 is connect with 4 feet of chip U1 and the end LED+ respectively, inductance T1
The other end connect with the end LED-, capacitor C3 and resistance R4 are also respectively connected between the end LED+ and the end LED-；Overvoltage protection electricity
Road F includes resistance R3, and one end of resistance R3 is connect with 1 foot of chip U1, the other end ground connection of resistance R3；Electromagnetic compatibility circuit E
Including capacitor C4, one end of capacitor C4 is connect with the end LED-, and the other end of capacitor C4 is connect with the ground terminal of resistance R1.
Compared with prior art, the beneficial effects of the present invention are:
1, the present invention by optimization after on surge protection reduce 1 device, remove on VCC/comp 2 devices,
Remove 2~4 devices (freewheeling diode parallel resistance is because slightly having difference in practical pressure-resistant environment number) on EMC, in OVP mistake
1~3 device (with EMC situation, and there are also the C6 in drop-down capacitor such as Fig. 1/2 for part), global optimization are saved in pressure protection
Device afterwards is estimated at 6~10, even more if technology end requires difference, in the feelings for substantially reducing device optimization Layout
PCB size can also be saved under condition, reduce production cost；
2, the patent device led in the present invention using cooperation supplier Shandong crystalline substance passes through surge protection and rectification module whole
Pressure-sensitive or TVS device is integrated into inside rectifier bridge by the frame structure adjustment of stream bridge heap, and the present invention is by two original rectifications and resists
Two modules of surge function are combined into one；
3, it needs multiple resistance to be adjusted to Rovp by series connection partial pressure OVP overvoltage protective module in the present invention and only needs one
0805 resistance；
4, overall architecture of the present invention is especially radiated more easy to handle, it is only necessary to a Y capacitance by being changed to floatingly in EMC on the spot
(F), F does not need solve EMC or even under particular requirement (as single pressure, such as EMC do not have to ground connection).
Detailed description of the invention
Fig. 1 is that conventional drive scheme schematic diagram and module divide figure in the market；
Fig. 2 simplifies drive scheme schematic diagram and module division figure for of the invention；
Fig. 3 is that drive scheme of simplifying of the invention is the schematic diagram and module division figure for reinforcing radiation treatment；
Fig. 4 is that bridge heap internal framework of the present invention adjusts structure chart；
In figure: 1,2 foot of bridge heap；2,4 foot of bridge heap；3, TVS chip；4, electrode plate.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment 1
Fig. 1-4 is please referred to, the present invention is the following technical schemes are provided: a kind of high power factor LED drive circuit simplified, packet
Include safety protective circuit A, safety protective circuit A is connect with surge protection and rectification circuit B, surge protection and rectification circuit B with
Filter circuit C connection, filter circuit C are connect with core work circuit H, and core work circuit H is internally connected with overvoltage protection electricity
Road F and electromagnetic compatibility circuit E.
Further, safety protective circuit A includes fuse resistance F1, and one end of fuse resistance F1 is connect with firewire L,
The other end is connect with surge protection and rectification circuit B.
Further, surge protection and rectification circuit B include antisurge rectifier bridge stack BD1, antisurge rectifier bridge stack BD1's
4 feet connect the other end of fuse resistance F1, the 3 feet ground connection of antisurge rectifier bridge stack BD1, and 2 feet of antisurge rectifier bridge stack BD1 connect
1 foot of zero curve N, antisurge rectifier bridge stack BD1 meet filter circuit C.
Further, diode TVS is also connected on 2 feet and 4 feet of antisurge rectifier bridge stack BD1.
Further, filter circuit C includes inductance L1, capacitor C1 and capacitor C2, wherein one end of inductance L1 and antisurge
1 foot of rectifier bridge stack BD1 connects, and the other end of inductance L1 is connect with core work circuit H, inductance L1 and antisurge rectifier bridge stack
One end of the 1 foot connection of BD1 is connected with capacitor C1, the other end ground connection of capacitor C1, and inductance L1 is connect with core work circuit H
One end is connected with capacitor C2, the other end ground connection of capacitor C2.
Further, core work circuit H includes chip U1, wherein one end of the 4 feet connection inductance L1 of chip U1, core
3 feet of piece U1 are hanging, and the 2 feet ground connection of chip U1,1 foot of chip U1 connects overvoltage crowbar F, and 7 feet of chip U1 are connected with
The other end of resistance R1, resistance R1 is grounded, and the both ends of resistance R1 are parallel with resistance R2,5 and 6 feet of chip U1 with diode D1
It is connected with one end of inductance T1, the other end of diode D1 is connect with 4 feet of chip U1 and the end LED+ respectively, and inductance T1's is another
End is connect with the end LED-, and capacitor C3 and resistance R4 are also respectively connected between the end LED+ and the end LED-.
Further, overvoltage crowbar F includes resistance R3, and one end of resistance R3 is connect with 1 foot of chip U1, resistance R3
The other end ground connection.
Further, electromagnetic compatibility circuit E includes capacitor C4, and one end of capacitor C4 is connect with the end LED-, and capacitor C4's is another
One end is connect with the ground terminal of resistance R1.
Embodiment 2
Referring to Fig. 3, this embodiment differs from embodiment 1 in that: core work circuit H is internally connected with over-voltage guarantor
Protection circuit F does not connect electromagnetic compatibility circuit E；The present embodiment may be used in the case where width presses input (multiple specified level pressure)
To meet the requirement of electromagnetic compatibility.
Further, the implementation method of the high power factor LED drive circuit of the present invention simplified, including following step
It is rapid:
(1), using fuse resistance F1 as security protection module；
(2), surge protection and rectification module are used as using antisurge rectifier bridge stack BD1 and diode TVS cooperation；
(3), electromagnetic compatibility processing module is done as pi type filter using inductance L1, capacitor C1 and capacitor C2 cooperation；
(4), using resistance R1, resistance R2, resistance R3, resistance R4, diode D1, inductance T1, capacitor C3 and chip U1
Cooperate the core work module as Buck topology；
(5), wherein, resistance R3 cooperates chip U1 to do overvoltage protection processing (i.e. OVP), and capacitor C4 makees the spoke of electromagnetic compatibility
Penetrate reply processing.
The rectification for the patent device that the present invention is mainly led using cooperation supplier Shandong crystalline substance and the module of Surge (antisurge)
Merging is that internal truss frame structure adjustment is done by rectifier bridge stack, and the structure newly increased that pressure-sensitive or TVS device is mounted is on the upper side,
Concrete operations be increase in the structure basis of Yuan Qiaodui one layer of radiating surface share bridge heap two input pins seal TVS chip into
It goes, specifically, being connected with TVS chip 3 above antisurge rectifier bridge stack BD1, the top of TVS chip 3 is connected with electrode plate 4,
Electrode plate 4 is connect with 2 feet of antisurge rectifier bridge stack BD1, to make the 2 of 3 one side of TVS chip and antisurge rectifier bridge stack BD1
Foot 1 connects, and the another side of TVS chip 3 is connect with 2 feet 4 of antisurge rectifier bridge stack BD1, rectifies to realize in antisurge
The diode TVS in parallel on 4 feet of the 2 of bridge heap BD1 realizes rectification to realize bridge heap and (pressure-sensitive) integration of TVS
With antisurge function integration, Fig. 4 can be specifically referred to；
VCC capacitor (i.e. C5 in Fig. 1) of the present invention is the adjustment of whole topological structure, at present the high power of market prevalence because
Plain IC essentially floats ground framework, powers when MOS switch turns off only inside IC substantially for the power supply of IC, thus needs
VCC charging is wanted to be still power-up state to maintain when MOS is opened inside IC, the present invention directly changes overall topology
For on the spot, power supply, which is directly pulled through from bus (i.e. network where L1 and C2 node), to be continued a little, and built in IC only needs
10pF or so capacitor, that is, sustainable is powered to internal VDD, and VDD is not necessarily to external bulky capacitor；
Comp capacitor of the invention can save, and be the mode by adjusting amplifier, on the market high power currently popular
Factor chip is by current mode amplifier+capacitor mode, and the present invention is using voltage-type amplifier+capacitance (PF grades built-in)
The mode of network is realized.
The present invention is by shifting gears: using voltage-type amplifier+resistance-capacitance network, Lai Shixian saves COMP capacitor.When
Amplifier input terminal in-phase end and reverse side, i.e. benchmark Iref and feedback Iled it is inconsistent when, can give feedback capacity impulse electricity, change
Comp voltage.As Iref=iled, comp voltage is fixed, and reaches stable state.
For the present invention in the processing of OVP overvoltage protection, the Chinese invention patent of directly application cooperation IC supplier Kiwi is (special
Benefit number are as follows: 201611026216.0) main thought uses voltage-second balance, gives directly applying in application end.It directly will be original
OVP pull-up resistor/drop-down capacitor saves.
The present invention mainly has benefited from whole topology and has to be changed to floatingly on the spot, in EMC in the processing of EMC (electromagnetic compatibility)
Radiation treatment on it is more easy to handle, the RC of actual test almost freewheeling diode parallel connection can be saved, Y capacitance (capacitor C4)
It is that part default process (such as CISPR 15:2013 in single pressure request) can be done according to actual requirement, such as Fig. 2.
In conclusion the present invention removes 2 by reducing by 1 device on surge protection after optimization on VCC/comp
Device, remove on EMC 2~4 devices (freewheeling diode parallel resistance because in practical pressure-resistant environment number slightly difference),
It is saved on OVP overvoltage protection 1~3 device (with EMC situation, and there are also pull down the C6 of capacitor as shown in figure 1 for part), it is whole
Device after optimization is estimated at 6~10, even more if technology end requires difference, is substantially reducing device optimization Layout
In the case where can also save PCB size.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of high power factor LED drive circuit simplified, it is characterised in that: including safety protective circuit A, safeguard protection electricity
Road A is connect with surge protection and rectification circuit B, and surge protection and rectification circuit B are connect with filter circuit C, filter circuit C and core
The H connection of heart operating circuit, core work circuit H, which is internally connected with inside overvoltage crowbar F or core work circuit H, to be connected
It is connected to overvoltage crowbar F and electromagnetic compatibility circuit E.
2. a kind of high power factor LED drive circuit simplified according to claim 1, it is characterised in that: the safety
Protecting circuit A includes fuse resistance F1, and one end of fuse resistance F1 is connect with firewire L, the other end and surge protection and whole
Current circuit B connection.
3. a kind of high power factor LED drive circuit simplified according to claim 2, it is characterised in that: the surge
Protection and rectification circuit B include antisurge rectifier bridge stack BD1, and 4 feet of antisurge rectifier bridge stack BD1 connect the another of fuse resistance F1
One end, the 3 feet ground connection of antisurge rectifier bridge stack BD1,2 feet of antisurge rectifier bridge stack BD1 connect zero curve N, antisurge rectifier bridge stack
1 foot of BD1 meets filter circuit C.
4. a kind of high power factor LED drive circuit simplified according to claim 3, it is characterised in that: the anti-wave
It gushes and is also connected with diode TVS on 2 feet and 4 feet of rectifier bridge stack BD1.
5. a kind of high power factor LED drive circuit simplified according to claim 4, it is characterised in that: the filtering
Circuit C includes inductance L1, capacitor C1 and capacitor C2, wherein and one end of inductance L1 is connect with 1 foot of antisurge rectifier bridge stack BD1,
The other end of inductance L1 is connect with core work circuit H, and one end that inductance L1 is connect with 1 foot of antisurge rectifier bridge stack BD1 connects
It is connected to capacitor C1, the other end ground connection of capacitor C1, inductance L1 is connected with capacitor C2 with the one end connecting core work circuit H, electricity
Hold the other end ground connection of C2.
6. a kind of high power factor LED drive circuit simplified according to claim 5, it is characterised in that: the core
Operating circuit H includes chip U1, wherein one end of the 4 feet connection inductance L1 of chip U1,3 feet of chip U1 are hanging, chip U1's
1 foot of 2 feet ground connection, chip U1 connects overvoltage crowbar F, and 7 feet of chip U1 are connected with resistance R1, another termination of resistance R1
Ground, the both ends of resistance R1 are parallel with resistance R2, and 5 and 6 feet of chip U1 are connect with one end of diode D1 and inductance T1, two poles
The other end of pipe D1 is connect with 4 feet of chip U1 and the end LED+ respectively, and the other end of inductance T1 is connect with the end LED-, the end LED+ with
Capacitor C3 and resistance R4 are also respectively connected between the end LED-.
7. a kind of high power factor LED drive circuit simplified according to claim 6, it is characterised in that: the over-voltage
Protecting circuit F includes resistance R3, and one end of resistance R3 is connect with 1 foot of chip U1, the other end ground connection of resistance R3.
8. a kind of high power factor LED drive circuit simplified according to claim 7, it is characterised in that: the electromagnetism
Compatible circuit E includes capacitor C4, and one end of capacitor C4 is connect with the end LED-, and the other end of capacitor C4 and the ground terminal of resistance R1 connect
It connects.
9. the implementation method of the high power factor LED drive circuit according to claim 1-8 simplified, feature
It is, comprising the following steps:
(1), using fuse resistance F1 as security protection module；
(2), surge protection and rectification module are used as using antisurge rectifier bridge stack BD1 and diode TVS cooperation；
(3), electromagnetic compatibility processing module is done as pi type filter using inductance L1, capacitor C1 and capacitor C2 cooperation；
(4), cooperated using resistance R1, resistance R2, resistance R3, resistance R4, diode D1, inductance T1, capacitor C3 and chip U1
Core work module as Buck topology；
(5), wherein, resistance R3 cooperates chip U1 to do overvoltage protection processing, and capacitor C4 makees the radiation reply processing of electromagnetic compatibility.
10. the implementation method of the high power factor LED drive circuit according to claim 9 simplified, it is characterised in that: peace
Full protection circuit A includes fuse resistance F1, and one end of fuse resistance F1 is connect with firewire L, the other end and surge protection and
Rectification circuit B connection；Surge protection and rectification circuit B include antisurge rectifier bridge stack BD1,4 feet of antisurge rectifier bridge stack BD1
The other end of fuse resistance F1, the 3 feet ground connection of antisurge rectifier bridge stack BD1 are connect, 2 feet of antisurge rectifier bridge stack BD1 connect zero
1 foot of line N, antisurge rectifier bridge stack BD1 meet filter circuit C；Two are also connected on 2 feet and 4 feet of antisurge rectifier bridge stack BD1
Pole pipe TVS；Filter circuit C includes inductance L1, capacitor C1 and capacitor C2, wherein one end of inductance L1 and antisurge rectifier bridge stack
1 foot of BD1 connects, and the other end of inductance L1 is connect with core work circuit H, 1 foot of inductance L1 and antisurge rectifier bridge stack BD1
One end of connection is connected with capacitor C1, the other end ground connection of capacitor C1, one end connection that inductance L1 is connect with core work circuit H
There are capacitor C2, the other end ground connection of capacitor C2；Core work circuit H includes chip U1, wherein 4 feet of chip U1 connect inductance
3 feet of one end of L1, chip U1 are hanging, and the 2 feet ground connection of chip U1,1 foot of chip U1 connects overvoltage crowbar F, chip U1
7 feet be connected with resistance R1, the other end ground connection of resistance R1, the both ends of resistance R1 are parallel with resistance R2,5 and 6 feet of chip U1
It is connect with one end of diode D1 and inductance T1, the other end of diode D1 is connect with 4 feet of chip U1 and the end LED+ respectively,
The other end of inductance T1 is connect with the end LED-, and capacitor C3 and resistance R4 are also respectively connected between the end LED+ and the end LED-；Over-voltage
Protecting circuit F includes resistance R3, and one end of resistance R3 is connect with 1 foot of chip U1, the other end ground connection of resistance R3；Electromagnetic compatibility
Circuit E includes capacitor C4, and one end of capacitor C4 is connect with the end LED-, and the other end of capacitor C4 is connect with the ground terminal of resistance R1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910421735.4A CN110035587A (en) | 2019-05-21 | 2019-05-21 | A kind of high power factor LED drive circuit simplified and its implementation |
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| CN201910421735.4A CN110035587A (en) | 2019-05-21 | 2019-05-21 | A kind of high power factor LED drive circuit simplified and its implementation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730540A (en) * | 2019-10-17 | 2020-01-24 | 横店集团得邦照明股份有限公司 | LED circuit adopting inductor series connection mode and implementation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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