CN206498566U - One kind splits isolation drive power supply - Google Patents
One kind splits isolation drive power supply Download PDFInfo
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- CN206498566U CN206498566U CN201720157328.3U CN201720157328U CN206498566U CN 206498566 U CN206498566 U CN 206498566U CN 201720157328 U CN201720157328 U CN 201720157328U CN 206498566 U CN206498566 U CN 206498566U
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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
- 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]
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Abstract
The utility model splits isolation drive power supply there is provided one kind, belongs to driving power supply technical field.It solves existing driving power supply and there is the problem of stroboscopic causes user's visual impairment.This driving power supply, including input protection circuit, input rectifying filter circuit, isolation circuit, output filter circuit, power supply circuit and control circuit；The input termination civil power of input protection circuit, the input of output termination input rectifying filter circuit；The output end of input rectifying filter circuit connects the input of isolation circuit primary side and power supply circuit respectively；Power supply circuit output end connection control circuit；The secondary side output filter circuit of isolation circuit, the output end of output filter circuit is connected with the drop ripple circuit of the ripple value for reducing output current, and the output end of drop ripple circuit is used to connect LED load.This driving power supply output current ripple accounting is low, no stroboscopic, the eyesight of user will not be caused damage, practicality is good.
Description
Technical field
The utility model belongs to driving power supply technical field, is related to one kind and splits isolation drive power supply.
Background technology
A large amount of with large power semiconductor LED (LED) light source use, its energy-saving and environmental protection, specular removal, overlength
The novel illumination light source in life-span, in the case where global environmental pollution aggravates the exhaustion increasingly with non-renewable energy resources, has caused
The common concern of countries in the world, especially Europe, the United States, the great attention of Asia developed country, at the same time efficiently, energy-saving and environmental protection
LED/light source also largely applied in actual life every field, each Illumination Enterprise all strives item and develops such light source and drive
Dynamic power supply, but traditional incandescent lamp, fluorescent lamp and LED lamp generally have and there is stroboscopic phenomenon, and the eyes given people are damaged；
At this stage in Power Management Design, it is contemplated that power supply cost, assembling volume, the complexity of circuit, existing LED lamp have stroboscopic
Phenomenon.Some do not have the electrical source power factor of stroboscopic and very low, and harmonic wave is serious, causes the interference to other electrical equipments, it is impossible to
Normal work；Also some do not have the power supply inefficiencies of stroboscopic, can only accomplish single voltage, it is impossible to each place of the compatible whole world
Need for electricity.Such as a kind of light-emitting diode light source driving [application number of Chinese patent：201010551052.X] disclose
Following technical scheme：The light-emitting diode light source driving, including EMI input constraints circuit, input rectifying filter circuit,
PFC and DC converting circuit, IC auxiliary power supplies circuit, output rectification filter unit, constant pressure and constant current output feedback control circuit,
It is characterized in that：EMI input constraint circuits are by CX1；L1；CX2；L2 is constituted, and is filtered out the output electric signal after power network clutter and is connected to
The 2-1 pin and 2-3 pin of input rectifying filter circuit carry out rectification and filtered by C1；Direct current after rectifying and wave-filtering is electrically connected to isolation
The primary 7-6 ends of transformer and 7-5 ends；The V1 in PFC and DC converting circuit is connected to, realizes power factor effect just and directly
Circulation is changed, while be connected to IC auxiliary power supply circuits, through isolating transformer be coupled to by-pass group 7-3 ends and 7-4 ends carry out it is whole
The VDD pin that the PFC and power factor of electric network correcting chip IC1 in DC converting circuit is connected to after stream filtering are powered for it；Pass through
Isolating transformer winding coil in power switch pipe V1 cut-off and conducting, and circuit carries out the conversion of magnetic energy and electric energy, by
The 7-2 ends and 7-1 ends of isolating transformer are connected to output rectification filter unit, carry out defeated with constant current by constant pressure after rectifying and wave-filtering
Go out feedback control circuit to loaded work piece；Constant pressure is connected to the defeated of output rectification filter unit with constant current output feedback control circuit
Go out end carry out partial pressure sampling, output end working condition is detected by photoelectrical coupler IC2, and feed back to grid power because
Number correcting chip IC1 1 pin and 2 pin carries out error amplification detection, the voltage constant output of control output current.Such scheme has
High Power Factor (PF) and low harmonics distortion (THD), the real energy-saving and environmental protection for accomplishing LED, extra long life effect, but the party
Case is in order to realize high input power factor, and single-level power factor correction (PFC) is on flyback topologies circuit, and this topological structure has
In one weakness, output current always 100 hertz or 120 hertz frequencies fluctuation, that is to say, that the ripple of output current compared with
Big to be generally larger than 20%, ripple makes LED luminosity non-constant compared with conference, causes visual flicker or interference video equipment, this
Sample not only substantially reduces LED service life, at the same higher stroboscopic the eyes of light fixture user can be also more prone to it is tired
The sensation of labor.
The content of the invention
The purpose of this utility model is there is above mentioned problem for existing technology, it is proposed that one kind splits isolation drive electricity
Source, technical problem to be solved in the utility model is：The stroboscopic of driving power supply how is eliminated to protect the eyesight of user.
The purpose of this utility model can be realized by following technical proposal：One kind splits isolation drive power supply, including defeated
Enter protection circuit, input rectifying filter circuit, isolation circuit, output filter circuit, power supply circuit and control circuit；The input
The input termination civil power of protection circuit, the input of output termination input rectifying filter circuit；The input rectifying filter circuit
Output end connect the input of isolation circuit primary side and power supply circuit respectively；The power supply circuit output end connection control circuit；
The secondary side output filter circuit of the isolation circuit, it is characterised in that the output end of the output filter circuit is connected with
For the drop ripple circuit for the ripple value for reducing output current, the output end of the drop ripple circuit is used to connect LED load.
Principle of the present utility model is as follows：Civil power by being connected to input rectifying filter circuit after input protection circuit, by
Input rectifying filter circuit carries out rectification and filtering, obtains the straight direct current of waveform, and power supply circuit and isolation electricity are inputted respectively
Road, control circuit is conveyed to after power supply circuit progress partial pressure, so as to control the startup of circuit to power, in above process,
By the frequency of control circuit start and controlling switch power supply, adjust the current value of output, realize Constant current output, at the same by every
From circuit carry out high-low pressure isolation, be connected to output filter circuit carry out output filtering, after filtering after current wave deformation
It is straight, finally by by electric current input drop ripple circuit in, further reduce the line in output current by dropping ripple circuit
Ripple electric current, makes ripple current be reduced to less than 1%, so as to eliminate the stroboscopic of output voltage, protects the eyesight of user.
In above-mentioned one kind splits isolation drive power supply, the drop ripple circuit includes ripple current filter controller
U2, metal-oxide-semiconductor Q2, resistance R20, resistance R21, resistance R26, electric capacity C5, electric capacity C7, electric capacity C9 and diode D9；The resistance R21
One termination output filter circuit output end, resistance R21 another termination ripple current filter controller U2 Vcc pin；Electricity
The positive pole for holding C9 connects the output end of output filter circuit, and negative pole connects ripple current filter controller U2 LEDP pin；The resistance
R20 one end connects diode D9 positive pole and metal-oxide-semiconductor Q2 drain D, another termination ripple current filter of the resistance R20 respectively
Wave controller U2 LEDN pin；The negative pole difference connecting resistance R26 of diode D9 one end and electric capacity C5 one end；The electricity
Hinder R26 other end difference and then ripple current filter controller U2 DRV pin and the grid G of metal-oxide-semiconductor；The ripple current filter
Wave controller U2 CMP pin connect electric capacity C7 one end；The other end, the ripple current filter controller U2 GND of the electric capacity C7
Pin, the source S of metal-oxide-semiconductor are grounded.Dropping ripple current filter controller U2 in ripple circuit uses model LZC821's efficient
Ripple current filter controller, its pin is defined as follows：1.LEDN, the pin is output ripple detection feedback pin；2.LEDP, should
Pin is input ripple detection；3.VCC：12V input pins；4.GND grounding pins；5. feedback compensation pin；6.MOS pipes drive
Pin, from single phase PFC flyback forward current converter, output voltage pulsation detection and electric current regulation, automatic compensation output electricity
Stream, system ripple-free electric current, LZC821 adjust automatically LED currents fully allow metal-oxide-semiconductor Q2 power consumptions to minimize, so as to avoid MOS
Pipe Q2 crosses cause thermal damage.Feedback is detected by ripple and fed back, the control to ripple current is realized, it is dropped to less than 1%, from
And eliminate stroboscopic.
In above-mentioned one kind splits isolation drive power supply, the output filter circuit include diode D7, resistance R17,
Resistance R18, resistance R19, electric capacity C12 and electric capacity C6；The positive pole of the diode D7 connects the primary side output of isolation circuit, described
Diode D7 negative pole connects the input of drop ripple circuit；One end of the resistance R17 and resistance R18 one end are and diode
D7 positive pole connection, the one end of the other end of the resistance R17 and the resistance R18 other end with electric capacity C12 is connected, electric capacity
The C12 other end connects the positive pole of diode D7 negative pole, resistance R19 one end and electric capacity C6 respectively, and the resistance R19's is another
One end and electric capacity C6 negative pole are grounded.By setting output filter circuit so that in the DC voltage for reducing pulsation as far as possible
Alternating component, retain its flip-flop, make output voltage ripple coefficient reduction, waveform becomes smoother, so corresponding
The amplitude of ripple current is reduced, to eliminate the stroboscopic of driving power supply.
In above-mentioned one kind splits isolation drive power supply, the input rectifying filter circuit includes rectification unit, PF and controlled
Unit and High frequency filter unit processed, the rectification unit is included by diode D1, diode D2, diode D3 and diode D4 structures
Into bridge rectifier；The PF control units include inductance L3, resistance R2 and electric capacity C2；The High frequency filter unit includes electricity
Hold C4, resistance R14, resistance R15, resistance R16 and diode D12；The input and input protection circuit of the bridge rectifier
Output end connection, the output end of the bridge rectifier is connected with inductance L3 one end and resistance R2 one end respectively, described
The inductance L3 other end other end respectively with resistance R2, electric capacity C2 one end, the input of power supply circuit and electric capacity C4
One end is connected；The other end ground connection of the electric capacity C2；The other end of the electric capacity C4 is connected with diode D12 negative pole, described
Resistance R14, resistance R15 and resistance R16 are in parallel with electric capacity C4, and the positive pole of the diode D12 is first with isolation circuit respectively
Level side output end P- is connected with control circuit.Rectification unit by the alternating voltage of the positive and negative change of input by being changed into unidirectional arteries and veins
Dynamic voltage, then carries out the control of power factor (PF) by PF control units, and High frequency filter unit is used for the height for filtering out power input
Frequency part, so as to reduce the High-frequency Interference in power circuit.
In above-mentioned one kind splits isolation drive power supply, the input protection circuit includes the fuse being sequentially connected
F1, the first electromagnetic interface filter and the second electromagnetic interface filter；First electromagnetic interface filter is by inductance L1, piezo-resistance TVR1 and electric capacity
CX1 is constituted, and second electromagnetic interface filter is made up of inductance L2, piezo-resistance TVR2 and electric capacity CX2.Fuse F1 is used for circuit
In overload protection, the first electromagnetic interface filter and the second electromagnetic interface filter be mainly used in allowing the useful signal of low frequency to pass through, and
High-frequency Interference is suppressed.
In above-mentioned one kind splits isolation drive power supply, it is described control circuit include switch control chip U1, resistance R6,
Resistance R7, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R22, resistance R23, diode D11, metal-oxide-semiconductor
Q1, electric capacity C10 and electric capacity C11, the VDD pin of the switch control chip U1 are connected with power supply circuit, the switch control chip
The one end of U1 DRV pin respectively with resistance R13, resistance R22 is connected, COMP pin and the electric capacity C10 of the switch control chip U1
One end connection, the FB pin of switch control chip U1 one end respectively with electric capacity C11, resistance R6 one end and resistance R7
One end is connected, the CS pin of switch control chip U1 one end respectively with resistance R9, resistance R10 one end, the one of resistance R11
The source S connection at end, resistance R12 one end and metal-oxide-semiconductor Q1；The other end of the resistance R13 and resistance R22 connect two poles respectively
Pipe D11 positive pole and negative pole；The drain D of the metal-oxide-semiconductor Q1 and the resistance R7 other end are connected with power supply circuit, the MOS
Pipe Q1 grid G is connected with diode D11 positive pole and resistance R23 one end respectively, the other end and resistance of the resistance R23
R11 one end connection；The other end of the resistance R6, the resistance R9 other end, the resistance R10 other end, resistance R11 it is another
The other end at end, the resistance R12 other end, the electric capacity C10 other end and electric capacity C11 is grounded.Switch control chip is used
LZC811B, it is internal with clamp circuit, for the top or bottom of periodically variable waveform to be maintained at into a certain determination
In DC level.CS pin cooperation resistance R9, resistance R10, resistance R11 and resistance R12 realize the detecting and regulation of output current, FB
The compensation that pin is adjusted as input, while can detect that discharge time and overvoltage are detected.DRV pin as metal-oxide-semiconductor Q1 driving pin,
Realize the control of switching frequency.
In above-mentioned one kind splits isolation drive power supply, the power supply circuit include resistance R3, resistance R5, resistance R8,
Electric capacity C3, diode D5 and diode D6, described resistance R5 one end are connected with PF control unit output ends, and the resistance R5's is another
One end is connected with resistance R3 one end, resistance R3 other end one end respectively with resistance R8, switch control chip U1 VDD
Pin, electric capacity C3 positive pole, diode D6 negative pole connection, the other end of the resistance R8 are connected with diode D5 negative pole, institute
The positive pole for stating diode D5 is connected with isolation circuit output, and the positive pole of the diode D6 is connected with electric capacity C3 negative pole, electric capacity
C3 negative pole ground connection.Power supply circuit is mainly that control circuit provides the preceding power supply of startup and powered after starting, wherein, startup is preceding to power
Mainly there is input voltage to input to the switch control chip in control circuit after resistance R5 and resistance R3 partial pressures, while in circuit
Diode D6 play a part of filter high frequency voltage stabilizing；Powered after startup it is main by isolation circuit output voltage through diode D5 and
The switch control chip in control circuit is inputed to after resistance R8 partial pressures.
Compared with prior art, the isolation drive power supply of the present utility model that splits has advantages below：1 by setting drop line
Wave circuit realizes the control to the ripple current in output current, makes it below 1%, so can effectively eliminate driving power supply
Stroboscopic；2, by setting PF control units in input rectifying filter circuit, realize the power factor controlling to driving power supply,
Improve the power consumption efficiency of LED load；3 by setting two-stage electromagnetic interface filter to realize high-frequency suppressing, while coordinating High frequency filter list
Member, is filtered out to greatest extent to High-frequency Interference；4th, using the form of two-stage electromagnetic interface filter, the line footpath of inductance is reduced, is reduced
The space requirement of electromagnetic interface filter, facilitates the arrangement of circuit on circuit boards.
Brief description of the drawings
Fig. 1 is the theory diagram of the present utility model for splitting isolation drive power supply.
Fig. 2 is the circuit theory diagrams of the present utility model for splitting isolation drive power supply.
In figure, 1. input protection circuits；The electromagnetic interface filters of 1a. first；The electromagnetic interface filters of 1b. second；2. input rectifying is filtered
Circuit；2a. rectification units；2b.PF control units；2c. High frequency filter units；3. isolation circuit；4. output filter circuit；5. supply
Circuit；6. control circuit；7. ripple circuit drops.
Embodiment
The following is specific embodiment of the utility model and with reference to accompanying drawing, further is made to the technical solution of the utility model
Description, but the utility model is not limited to these embodiments.
As shown in figure 1, originally splitting isolation drive power supply includes input protection circuit 1, input rectifying filter circuit 2, isolation
Circuit 3, output filter circuit 4, power supply circuit 5 and control circuit 6；The input termination civil power of input protection circuit 1, output termination
The input of input rectifying filter circuit 2；The output end of input rectifying filter circuit 2 connects the primary side of isolation circuit 3 and confession respectively
The input of circuit 5；The output end connection control circuit 6 of power supply circuit 5；The secondary side output filter circuit 4 of isolation circuit 3,
The output end of output filter circuit 4 is connected with the drop ripple circuit 7 of the ripple value for reducing output current, drop ripple circuit 7
Output end be used for connect LED load.
Specifically, as shown in Fig. 2 input protection circuit 1 includes fuse F1, the first electromagnetic interface filter being sequentially connected
1a and the second electromagnetic interface filter 1b；First electromagnetic interface filter 1a is made up of inductance L1, piezo-resistance TVR1 and electric capacity CX1, the 2nd EMI
Wave filter 1b is made up of inductance L2, piezo-resistance TVR2 and electric capacity CX2.Fuse F1, the first EMI are passed sequentially through after civil power input
Wave filter 1a and the second electromagnetic interface filter 1b, the overload protection that fuse is used in circuit, the first electromagnetic interface filter 1a and the 2nd EMI
Wave filter 1b is mainly used in allowing the useful signal of low frequency to pass through, and High-frequency Interference is suppressed.Used in the present embodiment
The mode of two grades of electromagnetic interface filters can effectively reduce inductance L1 and inductance L2 line footpath, so as to reduce input protection circuit 1 in electricity
Volume on the plate of road, facilitates circuit arrangement.
Input rectifying filter circuit 2 includes rectification unit 2a, PF control unit 2b and High frequency filter unit 2c, rectification unit
2a includes the bridge rectifier being made up of diode D1, diode D2, diode D3 and diode D4, and rectification unit 2a is by inciting somebody to action
The alternating voltage of the positive and negative change of input is changed into unidirectional pulsating volage and is then output to PF control units 2b；PF control unit 2b bags
Include inductance L3, resistance R2 and electric capacity C2；High frequency filter unit 2c includes electric capacity C4, resistance R14, resistance R15, resistance R16 and two
Pole pipe D12, PF control unit 2b carries out the control of power factor (PF) to the electric current of input, while limiting EMI in input protection circuit 1
Peak point current；The input of bridge rectifier is connected with the output end of input protection circuit 1, the output end point of bridge rectifier
It is not connected with inductance L3 one end and resistance R2 one end, the other end, the electric capacity C2 of the inductance L3 other end respectively with resistance R2
One end, the input of power supply circuit 5 and electric capacity C4 one end connection；Electric capacity C2 other end ground connection；Electric capacity C4's is another
End is connected with diode D12 negative pole, and resistance R14, resistance R15 and resistance R16 are in parallel with electric capacity C4, and diode D12 is just
Pole is connected with the primary side output end P- and control circuit 6 of isolation circuit 3 respectively, so as to enter to the HFS of power input
Row is filtered out, further the High-frequency Interference in reduction power circuit.In the present embodiment, isolation circuit 3 is high-low pressure isolating transformer
T3。
Circuit 6 is controlled to include switch control chip U1, resistance R6, resistance R7, resistance R9, resistance R10, resistance R11, resistance
R12, resistance R13, resistance R22, resistance R23, diode D11, metal-oxide-semiconductor Q1, electric capacity C10 and electric capacity C11, switch control chip U1
VDD pin be connected with power supply circuit 5, the one end of switch control chip U1 DRV pin respectively with resistance R13, resistance R22 is connected,
Switch control chip U1 COMP pin are connected with electric capacity C10 one end, and switch control chip U1 FB pin are respectively with electric capacity C11's
One end connection of one end, resistance R6 one end and resistance R7, switch control chip U1 CS pin one end respectively with resistance R9, electricity
Hinder R10 one end, resistance R11 one end, resistance R12 one end and metal-oxide-semiconductor Q1 source S connection；Resistance R13 and resistance R22
The other end connect diode D11 positive pole and negative pole respectively；Metal-oxide-semiconductor Q1 drain D and the resistance R7 other end with power supply
Circuit 5 is connected, and metal-oxide-semiconductor Q1 grid G is connected with diode D11 positive pole and resistance R23 one end respectively, and resistance R23's is another
One end is connected with resistance R11 one end；The resistance R6 other end, the resistance R9 other end, the resistance R10 other end, resistance R11
The other end, the resistance R12 other end, the electric capacity C10 other end and electric capacity the C11 other end be grounded.Switch control chip
Using LZC811B, it is internal with clamp circuit, for the top or bottom of periodically variable waveform to be maintained at into a certain true
In fixed DC level.CS pin cooperation resistance R9, resistance R10, resistance R11 and resistance R12 realize detecting and the tune of output current
Section, the compensation that FB pin are adjusted as input, while can detect that discharge time and overvoltage are detected.DRV pin as metal-oxide-semiconductor Q1 drive
Dynamic pin, realizes the control of switching frequency.
Power supply circuit 5 includes resistance R3, resistance R5, resistance R8, electric capacity C3, diode D5 and diode D6, resistance R5 mono-
End is connected with PF control unit 2b output ends, and the resistance R5 other end is connected with resistance R3 one end, the resistance R3 other end point
The VDD pin, electric capacity C3 positive pole, diode D6 negative pole of one end, switch control chip U1 not with resistance R8 are connected, resistance R8
The other end be connected with diode D5 negative pole, diode D5 positive pole is connected with the output of isolation circuit 3, diode D6 positive pole
It is connected with electric capacity C3 negative pole, electric capacity C3 negative pole ground connection.Power supply circuit 5 predominantly control circuit 6 provide start before power supply and
Powered after startup, wherein, power supply mainly has input voltage to input to control circuit 6 after resistance R5 and resistance R3 partial pressures before starting
In switch control chip, while the diode D6 in circuit play a part of filter high frequency voltage stabilizing；Powered after startup it is main by every
The switch control chip in control circuit 6 is inputed to after diode D5 and resistance R8 partial pressures from the output voltage of circuit 3.
Output filter circuit 4 includes diode D7, resistance R17, resistance R18, resistance R19, electric capacity C12 and electric capacity C6；Two
Pole pipe D7 positive pole connects the primary side output of isolation circuit 3, and diode D7 negative pole connects the input of drop ripple circuit 7；Resistance
The positive pole of R17 one end and resistance R18 one end with diode D7 is connected, and the resistance R17 other end and resistance R18's is another
Hold one end with electric capacity C12 to be connected, the electric capacity C12 other end connect respectively diode D7 negative pole, resistance R19 one end and
Electric capacity C6 positive pole, the resistance R19 other end and electric capacity C6 negative pole are grounded.Pass through the electric capacity C12 in output filter circuit 4
It is filtered so that reduce the alternating component in the DC voltage of pulsation as far as possible, retains its flip-flop, makes output voltage line
Wave system number is reduced, and waveform becomes smoother, the amplitude of ripple current is so reduced accordingly, to eliminate the frequency of driving power supply
Dodge.
Drop ripple circuit 7 include ripple current filter controller U2, metal-oxide-semiconductor Q2, resistance R20, resistance R21, resistance R26,
Electric capacity C5, electric capacity C7, electric capacity C9 and diode D9；The output end of a resistance R21 termination output filter circuit 4, resistance R21's
Another termination ripple current filter controller U2 Vcc pin；Electric capacity C9 positive pole connects the output end of output filter circuit 4, negative pole
Connect ripple current filter controller U2 LEDP pin；Resistance R20 one end connects the leakage of diode D9 positive pole and metal-oxide-semiconductor Q2 respectively
Pole D, resistance R20 another termination ripple current filter controller U2 LEDN pin；Diode D9 negative pole difference connecting resistance R26
One end and electric capacity C5 one end；Resistance R26 other end difference and then ripple current filter controller U2 DRV pin and MOS
Pipe Q2 grid G；Ripple current filter controller U2 CMP pin connect electric capacity C7 one end；The electric capacity C7 other end, ripple current
Filter controller U2 GND pin, metal-oxide-semiconductor Q2 source S are grounded；Electric capacity C9 positive pole and diode D9 positive pole are drawn respectively
Wire is used to be connected with LED load as output end.Wherein, electric capacity C9 uses electrochemical capacitor, and electric capacity C7 is used as compensating electric capacity；Drop
Ripple current filter controller U2 uses model LZC821 efficient ripple current filter controller in ripple circuit 7, and it draws
Pin is defined as follows：1.LEDN, the pin is output ripple detection feedback pin；2.LEDP, the pin is input ripple detection；
3.VCC：12V input pins；4.GND grounding pins；5. feedback compensation pin CMP；6.MOS pipe Q2 drives pin DRV, from single-order
Section PFC flyback forward current converters, output voltage pulsation detection and electric current regulation, compensate output current, system is without line automatically
Ripple electric current, LZC821 adjust automatically LED currents fully allow metal-oxide-semiconductor Q2 power consumptions to minimize, so that avoiding metal-oxide-semiconductor Q2 crosses heat waste
It is bad.Feedback is detected by ripple and fed back, the control to ripple current is realized, it is dropped to less than 1%, so as to eliminate frequency
Dodge.
Principle of the present utility model is as follows：Civil power is by input protection circuit 1, by fuse F1 overload detection and two
The High-frequency Interference of level electromagnetic interface filter is connected to input rectifying filter circuit 2 after suppressing, and carries out rectification by bridge rectifier, obtains
Unidirectional pulsating volage, then carries out power factor controlling by PF control units 2b, finally exports electric signal tremendously high frequency filter unit
2c, obtains the straight direct current of waveform after High frequency filter, and power supply circuit 5 and isolation circuit 3 are then inputted respectively, by power supply electricity
Road 5 is by being conveyed to control circuit 6 after resistance R5 and resistance R3 partial pressures, to control the startup of circuit 6 to power, in said process
In, start the frequency of simultaneously controlling switch power supply by control circuit 6, adjust the current value of output, realize constant current controlling.Work as control
After circuit 6 starts, power supply circuit 5 is powered after being started by diode D5 and resistance R8.Electric signal after high-frequency filtering leads to
Cross isolation circuit 3 carry out high-low pressure isolation, be connected to output filter circuit 4 carry out output filtering, after filtering after electric current
It is straight that waveform becomes, and finally by by electric current input drop ripple circuit 7, output electricity is further reduced by dropping ripple circuit 7
Ripple current in stream, makes ripple current be reduced to less than 1%, so as to eliminate the stroboscopic of output voltage, protection user's regards
Power.In the present embodiment, the scope of mains input voltage is 85-277V, and output voltage is also 85-277V accordingly, actually should
It can be configured as needed in.
Specific embodiment described herein is only to the utility model spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement or using similar to described specific embodiment
Mode substitute, but without departing from spirit of the present utility model or surmount scope defined in appended claims.
Claims (6)
1. one kind splits isolation drive power supply, including input protection circuit (1), input rectifying filter circuit (2), isolation circuit
(3), output filter circuit (4), power supply circuit (5) and control circuit (6)；The input termination city of the input protection circuit (1)
Electricity, the input of output termination input rectifying filter circuit (2)；The output end of the input rectifying filter circuit (2) connects respectively
The input of isolation circuit (3) primary side and power supply circuit (5)；Power supply circuit (5) the output end connection control circuit (6)；Institute
State the secondary side output filter circuit (4) of isolation circuit (3), it is characterised in that the output end of the output filter circuit (4)
The drop ripple circuit (7) of the ripple value for reducing output current is connected with, the output end of the drop ripple circuit (7) is used to connect
Connect LED load, the drop ripple circuit (7) include ripple current filter controller U2, metal-oxide-semiconductor Q2, resistance R20, resistance R21,
Resistance R26, electric capacity C5, electric capacity C7, electric capacity C9 and diode D9；The one of the resistance R21 terminates the defeated of output filter circuit (4)
Go out end, resistance R21 another termination ripple current filter controller U2 Vcc pin；Electric capacity C9 positive pole connects output filter circuit
(4) output end, negative pole connects ripple current filter controller U2 LEDP pin；One end of the resistance R20 connects diode respectively
D9 positive pole and metal-oxide-semiconductor Q2 drain D, another termination ripple current filter controller U2 of resistance R20 LEDN pin；Institute
State diode D9 negative pole difference connecting resistance R26 one end and electric capacity C5 one end；The other end of the resistance R26 respectively and then
Ripple current filter controller U2 DRV pin and metal-oxide-semiconductor Q2 grid G；The CMP pin of the ripple current filter controller U2 connect
Electric capacity C7 one end；The other end of the electric capacity C7, ripple current filter controller U2 GND pin, metal-oxide-semiconductor Q2 source S it is equal
Ground connection.
2. one kind according to claim 1 splits isolation drive power supply, it is characterised in that the output filter circuit (4)
Including diode D7, resistance R17, resistance R18, resistance R19, electric capacity C12 and electric capacity C6；The positive pole of the diode D7 connects isolation
The primary side output of circuit (3), the negative pole of the diode D7 connects the input of drop ripple circuit (7)；The one of the resistance R17
The positive pole of end and resistance R18 one end with diode D7 is connected, the other end of the resistance R17 and the resistance R18 other end
One end with electric capacity C12 is connected, and the electric capacity C12 other end connects diode D7 negative pole, resistance R19 one end and electricity respectively
Hold C6 positive pole, the other end of the resistance R19 and electric capacity C6 negative pole are grounded.
3. one kind according to claim 1 or 2 splits isolation drive power supply, it is characterised in that the input rectifying filtering
Circuit (2) includes rectification unit (2a), PF control units (2b) and High frequency filter unit (2c), and the rectifier power source is included by two
The bridge rectifier that pole pipe D1, diode D2, diode D3 and diode D4 are constituted；The PF control units (2b) include inductance
L3, resistance R2 and electric capacity C2；The High frequency filter unit (2c) includes electric capacity C4, resistance R14, resistance R15, resistance R16 and two
Pole pipe D12；The input of the bridge rectifier is connected with the output end of input protection circuit (1), the bridge rectifier
Output end is connected with inductance L3 one end and resistance R2 one end respectively, and the other end of the inductance L3 is another with resistance R2 respectively
One end, electric capacity C2 one end, the input of power supply circuit (5) and electric capacity C4 one end connection；The other end of the electric capacity C2
Ground connection；The other end of the electric capacity C4 is connected with diode D12 negative pole, the resistance R14, resistance R15 and resistance R16 with
Electric capacity C4 is in parallel, and the positive pole of the diode D12 is respectively with the primary side output end P- of isolation circuit (3) and controlling circuit (6)
It is connected.
4. one kind according to claim 1 or 2 splits isolation drive power supply, it is characterised in that the input protection circuit
(1) fuse F1, the first electromagnetic interface filter (1a) and the second electromagnetic interface filter (1b) being sequentially connected are included；The first EMI filters
Ripple device (1a) is made up of inductance L1, piezo-resistance TVR1 and electric capacity CX1, and second electromagnetic interface filter (1b) is by inductance L2, pressure-sensitive
Resistance TVR2 and electric capacity CX2 compositions.
5. one kind according to claim 1 or 2 splits isolation drive power supply, it is characterised in that control circuit (6) bag
Include switch control chip U1, resistance R6, resistance R7, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance
R22, resistance R23, diode D11, metal-oxide-semiconductor Q1, electric capacity C10 and electric capacity C11, the switch control chip U1 VDD pin are with supplying
Circuit (5) is connected, and the one end of the DRV pin of the switch control chip U1 respectively with resistance R13, resistance R22 is connected, described to open
The COMP pin for closing control chip U1 are connected with electric capacity C10 one end, the FB pin of the switch control chip U1 respectively with electric capacity C11
One end, resistance R6 one end and resistance R7 one end connection, the CS pin of the switch control chip U1 are respectively with resistance R9's
One end, resistance R10 one end, resistance R11 one end, resistance R12 one end and metal-oxide-semiconductor Q1 source S connection；The resistance
R13 and resistance the R22 other end connect diode D11 positive pole and negative pole respectively；The drain D and resistance R7 of the metal-oxide-semiconductor Q1
The other end be connected with power supply circuit (5), the positive pole and resistance R23 of the grid G of the metal-oxide-semiconductor Q1 respectively with diode D11
One end connection, the other end of the resistance R23 is connected with resistance R11 one end；The other end of the resistance R6, resistance R9
The other end, the resistance R10 other end, the resistance R11 other end, the resistance R12 other end, electric capacity the C10 other end and electric capacity
The C11 other end is grounded.
6. one kind according to claim 1 or 2 splits isolation drive power supply, it is characterised in that power supply circuit (5) bag
Include resistance R3, resistance R5, resistance R8, electric capacity C3, diode D5 and diode D6, described resistance R5 one end and PF control units
(2b) output end is connected, and the other end of the resistance R5 is connected with resistance R3 one end, the resistance R3 other end respectively with resistance
R8 one end, switch control chip U1 VDD pin, electric capacity C3 positive pole, diode D6 negative pole connection, the resistance R8's is another
One end is connected with diode D5 negative pole, and the positive pole of the diode D5 is connected with isolation circuit (3) output, the diode D6
Positive pole be connected with electric capacity C3 negative pole, electric capacity C3 negative pole ground connection.
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| CN201720157328.3U CN206498566U (en) | 2017-02-21 | 2017-02-21 | One kind splits isolation drive power supply |
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| CN201720157328.3U CN206498566U (en) | 2017-02-21 | 2017-02-21 | One kind splits isolation drive power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109996372A (en) * | 2019-04-30 | 2019-07-09 | 电子科技大学中山学院 | LED driving power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109996372A (en) * | 2019-04-30 | 2019-07-09 | 电子科技大学中山学院 | LED driving power supply |
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| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A separate isolated driving power supply Effective date of registration: 20201209 Granted publication date: 20170915 Pledgee: Bank of Taizhou Co.,Ltd. Jiaojiang Jiefang Road sub branch Pledgor: ZheJiang YongYao Lighting Co.,Ltd. Registration number: Y2020330001163 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |