CN107148113B - A kind of LED drive circuit for T-type fluorescent tube - Google Patents
A kind of LED drive circuit for T-type fluorescent tube Download PDFInfo
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- CN107148113B CN107148113B CN201710452641.4A CN201710452641A CN107148113B CN 107148113 B CN107148113 B CN 107148113B CN 201710452641 A CN201710452641 A CN 201710452641A CN 107148113 B CN107148113 B CN 107148113B
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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
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Abstract
The invention discloses a kind of LED drive circuits for T-type fluorescent tube, including input rectification circuit, chip power supply circuit, PWM control integrated circuit, Buck-Boost circuit and the LED load being electrically connected to each other；The output end of the input rectification circuit is separately connected the input terminal of chip power supply circuit and the input terminal of Buck-Boost circuit, the input terminal of the output end connection PWM control integrated circuit of the chip power supply circuit, the input terminal of the output end connection Buck-Boost circuit of the PWM control integrated circuit, the output end of the Buck-Boost circuit connect LED load.Using the present invention, circuit is simple, system cost is low, small in size, high-efficient, performance is stablized.
Description
Technical field
The present invention relates to field of circuit technology more particularly to a kind of LED drive circuits for T-type fluorescent tube.
Background technique
Recent decades, T-type fluorescent lamp are widelyd popularize, however, old and useless fluorescent lamp also results in pass to the harm of environment
Note, the production of the just phased out fluorescent lamp of many producers, with the development of science and technology LED illumination is more environmentally-friendly compared with fluorescent lamp, section
Can, more there is advantage in properties of product, more and more countries are promoting LED illumination product, wherein T-type fluorescent tube (with T5,
Based on T8) it is no exception, this needs a kind of compatible electric ballast (Instant Start with regard to too impatient to wait
Parallel LED T-type product) goes to replace traditional fluorescent lamp.
Summary of the invention
Technical problem to be solved by the present invention lies in provide that a kind of circuit is simple, system cost is low, small in size, efficiency
It is high, performance is stable, for the LED drive circuit of T-type fluorescent tube.
The technical problems to be solved by the invention also reside in, and provide a kind of LED drive circuit for T-type fluorescent tube, can be real
Existing single-ended alternating current and electric ballast input compatibility.
In order to solve the above-mentioned technical problems, the present invention provides a kind of LED drive circuits for T-type fluorescent tube, including phase
Input rectification circuit, chip power supply circuit, PWM control integrated circuit, Buck-Boost circuit and the LED load being mutually electrically connected；
The output end of the input rectification circuit is separately connected the input terminal of chip power supply circuit and the input terminal of Buck-Boost circuit,
The input terminal of the output end connection PWM control integrated circuit of the chip power supply circuit, the output of the PWM control integrated circuit
The input terminal of end connection Buck-Boost circuit, the output end of the Buck-Boost circuit connect LED load.
As an improvement of the above scheme, the LED drive circuit for T-type fluorescent tube further includes compatible electronic ballast electricity
Road and compatible electronic ballast control circuit；The output end of the compatible electronic ballast circuit is separately connected LED load and institute
The input terminal of compatible electronic ballast control circuit is stated, the output end connection chip of the compatible electronic ballast control circuit supplies
The input terminal of circuit.
As an improvement of the above scheme, the input rectification circuit includes insurance resistance, the first varistor, annular electro
Sense, filter capacitor, rectifier bridge, I-shaped inductance, first resistor and the second varistor；The insurance resistance and the first varistor
Connection, first varistor are connect by ring-shaped inductors with filter capacitor, the input terminal and filter capacitor of the rectifier bridge
Connection, the output end of the rectifier bridge are connect with I-shaped inductance and first resistor, and the I-shaped inductance is in parallel with first resistor simultaneously
It is connect with the second varistor.
As an improvement of the above scheme, the chip power supply circuit includes second resistance, the 5th resistance, the 6th resistance,
One diode and the 4th capacitor；5th resistance is connect with the latter end of the 6th resistance series connection with input rectification circuit, the other end
Integrated circuit connection is controlled with PWM；One termination PWM of the 4th capacitor controls integrated circuit, other end ground connection；Described first
One end of diode is connect with second resistance, and the other end and PWM control integrated circuit connection.
As an improvement of the above scheme, the Buck-Boost circuit includes third capacitor, metal-oxide-semiconductor, inductance, electrolysis electricity
Appearance, freewheeling diode, third diode, the 7th capacitor, the 8th resistance, the 9th resistance and the tenth resistance；The third capacitor
One end connects the drain electrode of metal-oxide-semiconductor, other end ground connection；The drain electrode of one end connection metal-oxide-semiconductor of 7th capacitor, other end connection
The source electrode of metal-oxide-semiconductor；8th resistance connect the source electrode of metal-oxide-semiconductor with one end after the 9th resistor coupled in parallel, and the other end connects afterflow two
Pole pipe；One end connect freewheeling diode after tenth resistance is in parallel with electrolytic capacitor, and the other end connects the one of third diode
The other end at end, the third diode passes through inductance connection metal-oxide-semiconductor；The integrated electricity of grid connection PWM control of the metal-oxide-semiconductor
Road.
As an improvement of the above scheme, the compatible electronic ballast circuit includes the 5th diode, the 6th diode, the
Seven diodes, the 8th diode, the 6th capacitor, the 11st capacitor and the 12nd capacitor；5th diode, the six or two pole
Pipe, the 7th diode and the 8th diode are connected with each other to constitute rectifier bridge；6th capacitor, the 11st capacitor and the 12nd
Capacitor is used to adjust the electric current of LED load；One end of 6th capacitor connects the cathode of the 6th diode, and other end connection is defeated
Enter rectification circuit；One end of 11st capacitor and the 12nd capacitor connects the cathode of the 7th diode, and the other end connects lamp
The lamp base of pipe.
As an improvement of the above scheme, the compatible electronic ballast control circuit include the tenth capacitor, the 9th diode,
Twelfth resistor, eleventh resistor, the 9th capacitor, voltage-stabiliser tube and triode；Tenth capacitor, the 9th diode and the 12nd
After resistance is sequentially connected in series, one end is connect with compatible electronic ballast circuit, the base stage connection of the other end and triode；Described tenth
After one resistance, the 9th capacitor, voltage-stabiliser tube are in parallel, the base stage of one end and triode is connected, other end ground connection；The collection of the triode
Electrode connects PWM control integrated circuit, emitter ground connection.
As an improvement of the above scheme, the PWM control integrated circuit includes PWM chip, the 7th resistance, the two or two pole
Pipe, the 5th capacitor, 3rd resistor and the 4th resistance；The PWM chip is separately connected chip power supply circuit, Buck-Boost circuit
And ground terminal, and Buck-Boost circuit is connected by the 7th resistance parallel with one another and the second diode, it is connect by the 5th capacitor
Ground connects chip power supply circuit and Buck-Boost circuit by 3rd resistor by the 4th resistance eutral grounding.
As an improvement of the above scheme, the PWM chip is JW1725；The PWM chip be equipped with chip power pin,
Drive pin, current sense pin, ground pin, loop compensation pin and loop feedback pin；The chip power pin connects
Chip power supply circuit is connect, the driving pin connects Buck-Boost electricity by the 7th resistance parallel with one another and the second diode
Road, the current sense pin connect Buck-Boost circuit, the floating ground of the ground pin connection, and the loop compensation pin leads to
It crosses the 5th capacity earth and is coupled to the output of error amplifier in PWM chip, the loop feedback pin passes through the 4th resistance
It connects floating ground and chip power supply circuit and Buck-Boost circuit is connected by 3rd resistor.
As an improvement of the above scheme, the PWM chip is SY5830；The PWM chip be equipped with chip power pin,
Drive pin, output current sample pin, ground pin, loop compensation pin, inductance zero current detection pin；The chip supplies
Fulgurite foot connects chip power supply circuit, and the driving pin is connected by the 7th resistance parallel with one another and the second diode
Buck-Boost circuit, the output current sample pin connection Buck-Boost circuit, the ground pin connection, it is described
Loop compensation pin passes through the 5th capacity earth and is coupled to the output of error amplifier in PWM chip, the inductance zero current
Detection pin by the 4th resistance eutral grounding and connects chip power supply circuit by 3rd resistor.
The invention has the following beneficial effects:
The present invention is suitable for T-type fluorescent tube, it can be achieved that single-ended alternating current and electric ballast input compatibility, have circuit it is simple,
System cost is low, small in size, high-efficient and steady performance.Specifically, when T-type fluorescent tube connects AC alternating current single ended input
When, input rectification circuit, chip power supply circuit, PWM control integrated circuit and the work of Buck-Boost circuit, and formed typical
Buck-Boost topological structure drives LED load.When T-type fluorescent tube connects electric ballast double-width grinding, third diode is reversed
Cut-off, compatible electronic ballast circuit and the work of compatible electronic ballast control circuit, drive LED load.
Detailed description of the invention
Fig. 1 is the mode of connection of T-type fluorescent tube；
Fig. 2 is another mode of connection of T-type fluorescent tube；
Fig. 3 is structural schematic diagram of the present invention for the LED drive circuit of T-type fluorescent tube；
Fig. 4 is another structural schematic diagram of the present invention for the LED drive circuit of T-type fluorescent tube；
Fig. 5 is first embodiment circuit diagram of the present invention for the LED drive circuit of T-type fluorescent tube；
Fig. 6 is second embodiment circuit diagram of the present invention for the LED drive circuit of T-type fluorescent tube.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.Only this is stated, the present invention occurs in the text or will occur up, down, left, right, before and after, it is inside and outside etc. just
Position word is not to specific restriction of the invention only on the basis of attached drawing of the invention.
It is high in the cost of the countries such as the U.S., track remodelling, to facilitate installation, needing one when fluorescent tube is died of old age
The LED T-type fluorescent tube of kind compatible electronic ballast (Instant Start Parallel) directly goes to replace traditional fluorescent lamp.
Meanwhile when electric ballast is died of old age, it can also be inputted by AC (alternating current) alternating current with lightening LED lamp
Pipe, so that the present invention is just solved for the LED drive circuit of T-type fluorescent tube as a result, convenient for users to farthest reducing cost
It has determined this problem.
The present invention is suitable for T-type fluorescent tube, it can be achieved that single-ended alternating current and electric ballast (Instant Start
Parallel) input compatibility, with circuit is simple, system cost is low, small in size, high-efficient and steady performance.
Structural schematic diagram of the present invention for the LED drive circuit of T-type fluorescent tube, packet of the present invention are shown referring to Fig. 3, Fig. 3
Include be electrically connected to each other input rectification circuit 1, chip power supply circuit 2, PWM control integrated circuit 3, Buck-Boost circuit 4 and
LED load.Wherein, input rectification circuit 1 for converting direct current for electric main, and inhibits EMI (Electro
Magnetic Interference electromagnetic interference).Chip power supply circuit 2, for powering for chip.PWM controls integrated circuit 3,
For providing control PWM (modulation of Pulse Width Modulation pulse width) signal for Buck-Boost circuit 4.
Buck-Boost circuit 4 is the topological structure of circuit, may make up buck switching circuit.LED load, preferably LED T-type lamp
Pipe.
When work, the input terminal of the output end connection input rectification circuit 1 of electric main, the input rectification circuit 1
Output end is separately connected the input terminal of chip power supply circuit 2 and the input terminal of Buck-Boost circuit 4, the chip power supply circuit
The input terminal of 2 output end connection PWM control integrated circuit 3, the output end of the PWM control integrated circuit 3 connect Buck-
The output end of the input terminal of Boost circuit 4, the Buck-Boost circuit 4 connects LED load (referring to Fig. 1).
Referring to fig. 4, Fig. 4 shows another structural schematic diagram of the present invention for the LED drive circuit of T-type fluorescent tube, with Fig. 3
Unlike, it further include compatible electronic ballast circuit 5 and compatible electronic ballast control circuit 6 in the present embodiment.Wherein, institute
The output end for stating compatible electronic ballast circuit 5 is separately connected the defeated of LED load and the compatible electronic ballast control circuit 6
Enter end, the input terminal of the output end connection chip power supply circuit 2 of the compatible electronic ballast control circuit 6.
When work, the output end of electric ballast is separately connected the input terminal and compatible electronic ballast of input rectification circuit 1
The input terminal of device circuit 5；The output end of the input rectification circuit 1 is separately connected the input terminal and Buck- of chip power supply circuit 2
The input terminal of Boost circuit 4, the input terminal of the output end connection PWM control integrated circuit 3 of the chip power supply circuit 2 are described
PWM controls the input terminal of the output end connection Buck-Boost circuit 4 of integrated circuit 3, the output of the Buck-Boost circuit 4
End connection LED load；The output end of the compatible electronic ballast circuit 5 is separately connected LED load and the compatible electronic town
The input terminal of device control circuit 6 is flowed, the output end connection chip power supply circuit 2 of the compatible electronic ballast control circuit 6
Input terminal (referring to fig. 2).
It should be noted that the present invention can connect electric main or electric ballast.When T-type fluorescent tube connects AC alternating current single ended input
When, input rectification circuit 1, chip power supply circuit 2, PWM control integrated circuit 3 and Buck-Boost circuit 4 work, and form allusion quotation
The Buck-Boost topological structure of type drives LED load (referring to Fig. 3).When T-type fluorescent tube connects electric ballast double-width grinding,
Compatible electronic ballast circuit 5 and compatible electronic ballast control circuit 6 work, and drive LED load (referring to fig. 4).
Below in conjunction with circuit diagram specifically, the present invention is described in further detail (referring to Fig. 5 and Fig. 6).
The input rectification circuit 1 includes insurance resistance F1, the first varistor VR1, ring-shaped inductors L3, filter capacitor
C2, rectifier bridge BD1, I-shaped inductance L1, first resistor R1 and the second varistor VR2.Wherein, the insurance resistance F1 and first
The side of varistor VR1 connects, and the other side of the first varistor VR1 is connected by ring-shaped inductors L3 and filter capacitor C2
Connect, the input terminal of the rectifier bridge BD1 is connect with filter capacitor C2, the output end of the rectifier bridge BD1 and I-shaped inductance L1 and
The side of first resistor R1 connects, I-shaped inductance L1 I-shaped inductance L1 in parallel and described with first resistor R1 and first resistor
The other side of R1 is connect with the second varistor VR2.
The chip power supply circuit 2 include second resistance R2, the 5th resistance R5, the 6th resistance R6, first diode D1 and
4th capacitor C4.Wherein, the 5th resistance R5 is connect with one end after the 6th resistance R6 series connection with input rectification circuit 1, another
End is connect with PWM control integrated circuit 3；A termination PWM of the 4th capacitor C4 controls integrated circuit 3, other end ground connection；Institute
The one end for stating first diode D1 is connect with second resistance R2, and the other end is connect with PWM control integrated circuit 3.
The Buck-Boost circuit 4 has wide output voltage, low harmony wave, low cost, line voltage and load regulation good
The characteristics of comprising third capacitor C3, metal-oxide-semiconductor Q1, inductance L2, electrolytic capacitor CE1, sustained diode 4, third diode D3,
7th capacitor C7, the 8th resistance R8, the 9th resistance R9 and the tenth resistance R10, the third capacitor C3, metal-oxide-semiconductor Q1, inductance L2,
Electrolytic capacitor CE1, sustained diode 4, third diode D3, the 7th capacitor C7, the 8th resistance R8, the 9th resistance R9 and the tenth
Resistance R10 is electrically connected to each other to constitute buck switching circuit.Wherein, one end of the third capacitor C3 connects metal-oxide-semiconductor Q1's
Drain electrode, other end ground connection；The drain electrode of one end connection metal-oxide-semiconductor Q1 of the 7th capacitor C7, the other end connect the source of metal-oxide-semiconductor Q1
Pole；One end connect the source electrode of metal-oxide-semiconductor Q1 after the 8th resistance R8 is in parallel with the 9th resistance R9, and the other end connects freewheeling diode
D4；One end connect sustained diode 4 after the tenth resistance R10 is in parallel with electrolytic capacitor CE1, and the other end connects the three or two pole
The other end of one end of pipe D3, the third diode D3 passes through inductance L2 connection metal-oxide-semiconductor Q1；The grid of the metal-oxide-semiconductor Q1 connects
Connect PWM control integrated circuit 3.It should be noted that when T-type fluorescent tube connects electric ballast double-width grinding, third diode D3
Reversed cut-off, compatible electronic ballast control circuit 6, compatible electronic ballast circuit 5 work, and drive LED load.
The compatible electronic ballast circuit 5 includes the 5th diode D5, the 6th diode D6, the 7th diode D7, the
Eight diode D8, the 6th capacitor C6, the 11st capacitor C11 and the 12nd capacitor C12.Wherein, the 5th diode D5, the 6th
Diode D6, the 7th diode D7 and the 8th diode D8 are connected with each other to constitute rectifier bridge；The 6th capacitor C6, the 11st
Capacitor C11 and the 12nd capacitor C12 is used to adjust the electric current of LED load；One end of the 6th capacitor C6 connects the six or two pole
The cathode of pipe D6, the other end connect input rectification circuit 1；One end of the 11st capacitor C11 and the 12nd capacitor C12 connects
The cathode of 7th diode D7, the lamp base of other end connecting tube.It should be noted that by adjusting compatible electronic ballast electricity
The size of 6th capacitor C6, the 11st capacitor C11 and the 12nd capacitor C12 in road 5, thus it is possible to vary the electric current of LED load, thus
The power of control output LED load.
The compatible electronic ballast control circuit 6 includes the tenth capacitor C10, the 9th diode D9, twelfth resistor
R12, eleventh resistor R11, the 9th capacitor C9, voltage-stabiliser tube Z1 and triode Q2.Wherein, the tenth capacitor C10, the 9th 2 pole
After pipe D9 and twelfth resistor R12 is sequentially connected in series, one end is connect with compatible electronic ballast circuit 5, the other end and triode Q2
Base stage connection；After the eleventh resistor R11, the 9th capacitor C9, voltage-stabiliser tube Z1 are in parallel, the base stage of one end and triode Q2 connect
It connects, other end ground connection；The collector of the triode Q2 connects PWM control integrated circuit 3, emitter ground connection.Wherein, the described tenth
Capacitor C10 can be substituted using resistance.
PWM control integrated circuit 3 include PWM chip U1, the 7th resistance R7, the second diode D2, the 5th capacitor C5,
3rd resistor R3 and the 4th resistance R4.Wherein, the PWM chip U1 is separately connected chip power supply circuit 2, Buck-Boost circuit
4 and ground terminal, and by the 7th resistance R7 parallel with one another and the second diode D2 connection Buck-Boost circuit 4, pass through the 5th
Capacitor C5 ground connection, is grounded by the 4th resistance R4, passes through 3rd resistor R3 connection chip power supply circuit 2 and Buck-Boost circuit
4.Preferably, the PWM chip U1 is preferably JW1725, SY5830 or BP3319, system that but not limited to this.
It is first embodiment circuit diagram of the present invention for the LED drive circuit of T-type fluorescent tube, this implementation referring to Fig. 5, Fig. 5
In example, the PWM chip U1 is JW1725, and JW1725 is a chip for aiming at LED and making, and is encapsulated using SOT23-6, can be answered
The non-isolated lifting type LED information display system of constant current driving control PFC for designing with active illumination, the constant-current characteristics of JW1725 only need very
Few peripheral components can reach excellent constant-current characteristics, and system cost is low, high-efficient.
The PWM chip U1 is equipped with chip power pin (VCC pin), driving pin (GATE pin), current detecting
Pin (ISP pin), ground pin (GND pin), loop compensation pin (COMP pin) and loop feedback pin (FB pin).
The chip power pin connects chip power supply circuit 2；The driving pin passes through the 7th resistance R7 and second parallel with one another
The grid of metal-oxide-semiconductor Q1 in diode D2 connection Buck-Boost circuit 4, to drive metal-oxide-semiconductor Q1；The current sense pin connects
The connecting node in Buck-Boost circuit 4 between the source electrode of metal-oxide-semiconductor Q1 and the 8th resistance R8, the 9th resistance R9 is connect, so that electric
Stream detection pin can be by the size of the 8th resistance R8 and the 9th resistance R9 adjustment output electric current, so as to adjust the power of power supply；
The floating ground of the ground pin connection；The loop compensation pin is grounded and is coupled in PWM chip U1 by the 5th capacitor C5 and used
In the output of the error amplifier of output electric current adjustment；The loop feedback pin by the 4th resistance R4 connects floating ground and by the
Three resistance R3 connection chip power supply circuits 2 and Buck-Boost circuit 4, wherein after 3rd resistor R3 connects with the 4th resistance R4,
Loop feedback pin can by sampling and outputting voltage detect LED load whether open/short.
Correspondingly, in chip power supply circuit 2, one end and rectified voltage connect after the 5th resistance R5, the 6th resistance R6 series connection
It connects, the other end is connect with the VCC pin of PWM chip U1；4th capacitor C4 mono- terminates the VCC pin of PWM chip U1, another termination
The floating ground of high pressure, for filtering out VCC ripple；One end of first diode D1 is connect with second resistance R2, the other end and PWM chip U1
VCC pin connection.Meanwhile in compatible electronic ballast control circuit 6, the tenth capacitor C10, the 9th diode D9 and the 12nd
After resistance R12 is sequentially connected in series, one end is connect with the cathode of the 8th diode D8 in compatible electronic ballast circuit 5, the other end
It is connect with the base stage of triode Q2；After the eleventh resistor R11, the 9th capacitor C9, voltage-stabiliser tube Z1 are in parallel, one end and triode
The base stage of Q2 connects, another floating ground of termination；The collector of the triode Q2 meets PWM chip U1 in PWM control integrated circuit 3
VCC pin, emitter connect floating ground.
Specifically, 6 feet are defined as follows:
Starting:
After system electrification, busbar voltage charges to VCC by start-up resistor, when capacitor VCC voltage reaches 21V, gate pole
Driving signal starts to switch, and chip enters steady-working state, changes powered by output voltage to chip at this time.Built-in VCC voltage
Defencive function.When VCC is more than 35V, chip interior 6mA electric current will drag down VCC.Once VCC voltage is lower than 7V, JW1725 stops
Work.
Loop compensation:
By connecting the 5th capacitor C5 in COMP pin, integral element is introduced into input current ring.In offline application,
Cross-over frequency is far longer than secondary power frequency 120Hz or 100Hz.In order to realize better PFC effect, COMP pin needs to engage suitable
Capacitor.
Current constant control:
JW1725 chip is according to the output electric current of the voltage signal control system on sampling resistor stream.System output current is flat
Mean value obtains calculation formula: ILED=100/Rcs (mA), wherein current sampling resistor of the Rcs between ISP pin and GND pin.
Critical conduction mode:
JW1725 works in inductance L2 current continuous-conduction mode, when the metal-oxide-semiconductor Q1 outside chip controls is connected, flows through
The electric current of inductance L2 is started from scratch rising, when metal-oxide-semiconductor Q1 shutdown outside chip controls, flows through the electric current of inductance L2 from peak value
It begins to decline, when the electric current of inductance L2 drops to zero, chip controls metal-oxide-semiconductor Q1 conducting again.
It should be noted that the triode Q2 real-time detection compatible electronic ballast in compatible electronic ballast control circuit 6
Whether device circuit 5, which works, drags down the VCC pin of PWM chip U1, controls the PWM output end of PWM chip U1, prevents PWM chip
U1 malfunction, flashing light.
Second embodiment circuit diagram of the present invention for the LED drive circuit of T-type fluorescent tube is shown referring to Fig. 6, Fig. 6, with
Unlike Fig. 5, in the present embodiment, the PWM chip U1 is SY5830, is encapsulated using SOT23-6.
The PWM chip U1 is equipped with chip power pin (VIN pin), pin (DRV pin), output electric current is driven to adopt
Sample pin (ISEN pin), ground pin (GND pin), loop compensation pin (COMP pin), inductance L2 zero current detection pipe
Foot (VSEN pin).
The chip power pin connects chip power supply circuit 2, and the driving pin passes through the 7th resistance parallel with one another
R7 and the second diode D2 connection Buck-Boost circuit 4, the output current sample pin connect Buck-Boost circuit 4,
The ground pin connection, the loop compensation pin is grounded by the 5th capacitor C5 and is coupled to error in PWM chip U1
The output of amplifier, the inductance L2 zero current detection pin are grounded by the 4th resistance R4 and pass through 3rd resistor R3 connection core
Piece power supply circuit 2.
Specifically, 6 feet are defined as follows:
| Pin | Title | Description |
| 1 | ISEN | Export current sample pin.This pin is used to export the control of size of current. |
| 2 | GND | Ground. |
| 3 | COMP | Loop compensation foot |
| 4 | VSEN | Inductance zero current detection foot |
| 5 | VIN | Chip power pin. |
| 6 | DRV | The switch of external power MOSFET drives. |
In addition, the PWM chip U1 can also be BP3319, encapsulated using SOT23-6,6 feet be specifically defined as
Under:
| Pin | Title | Description |
| 1 | GATE | The gate driving of external power MOSFET. |
| 2 | GND | Ground. |
| 3 | CS | Current sampling port connects sampling resistor to ground |
| 4 | FB | Feedback signal sampling end |
| 5 | VCC | Chip power |
| 6 | COMP | Loop compensation point |
It should be noted that work of the invention is former when PWM chip U1 selects JW1725, SY5830 or BP3319 respectively
It manages roughly the same.
From the foregoing, it will be observed that the present invention is suitable for T-type fluorescent tube, it can be achieved that single-ended alternating current and electric ballast input compatibility, have
Circuit is simple, system cost is low, small in size, high-efficient and steady performance.Specifically, when T-type fluorescent tube connects AC alternating current
When single ended input, input rectification circuit 1, chip power supply circuit 2, PWM control integrated circuit 3 and Buck-Boost circuit 4 work,
And typical Buck-Boost topological structure is formed, drive LED load.When T-type fluorescent tube connects electric ballast double-width grinding, the
Three diode D3 reversely end, and compatible electronic ballast circuit 5 and compatible electronic ballast control circuit 6 work, and driving LED is negative
It carries.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art
For, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also considered as
Protection scope of the present invention.
Claims (8)
1. a kind of LED drive circuit for T-type fluorescent tube, which is characterized in that including input rectification circuit, the core being electrically connected to each other
Piece power supply circuit, PWM control integrated circuit, Buck-Boost circuit and LED load；
The output end of the input rectification circuit be separately connected chip power supply circuit input terminal and Buck-Boost circuit it is defeated
Enter end, the input terminal of the output end connection PWM control integrated circuit of the chip power supply circuit, the PWM controls integrated circuit
Output end connection Buck-Boost circuit input terminal, the output end of the Buck-Boost circuit connects LED load；
The Buck-Boost circuit include third capacitor, metal-oxide-semiconductor, inductance, electrolytic capacitor, freewheeling diode, third diode,
7th capacitor, the 8th resistance, the 9th resistance and the tenth resistance；The drain electrode of one end connection metal-oxide-semiconductor of the third capacitor, the other end
Ground connection；The drain electrode of one end connection metal-oxide-semiconductor of 7th capacitor, the other end connect the source electrode of metal-oxide-semiconductor；8th resistance and
The source electrode of one end connection metal-oxide-semiconductor, the other end connect freewheeling diode after nine resistor coupled in parallel；Tenth resistance and electrolytic capacitor are simultaneously
One end connects freewheeling diode after connection, and the other end connects one end of third diode, and the other end of the third diode passes through
Inductance connection metal-oxide-semiconductor；The grid connection PWM of the metal-oxide-semiconductor controls integrated circuit；
The LED drive circuit for T-type fluorescent tube further includes compatible electronic ballast circuit and the control of compatible electronic ballast
Circuit；The output end of the compatible electronic ballast circuit is separately connected LED load and compatible electronic ballast control electricity
The input terminal on road, the input terminal of the output end connection chip power supply circuit of the compatible electronic ballast control circuit.
2. being used for the LED drive circuit of T-type fluorescent tube as described in claim 1, which is characterized in that the input rectification circuit packet
It is pressure-sensitive to include insurance resistance, the first varistor, ring-shaped inductors, filter capacitor, rectifier bridge, I-shaped inductance, first resistor and second
Resistance；
The insurance resistance is connect with the side of the first varistor, and the other side of first varistor passes through ring-shaped inductors
It is connect with filter capacitor, the input terminal of the rectifier bridge is connect with filter capacitor, the output end and I-shaped inductance of the rectifier bridge
And the side connection of first resistor, the I-shaped inductance I-shaped inductance in parallel and described with first resistor and first resistor it is another
Side is connect with the second varistor.
3. being used for the LED drive circuit of T-type fluorescent tube as described in claim 1, which is characterized in that the chip power supply circuit packet
Include second resistance, the 5th resistance, the 6th resistance, first diode and the 4th capacitor；
5th resistance is connect with the latter end of the 6th resistance series connection with input rectification circuit, the other end and the integrated electricity of PWM control
Road connection；
One termination PWM of the 4th capacitor controls integrated circuit, other end ground connection；
One end of the first diode is connect with second resistance, and the other end and PWM control integrated circuit connection.
4. being used for the LED drive circuit of T-type fluorescent tube as described in claim 1, which is characterized in that the compatible electronic ballast
Circuit includes the 5th diode, the 6th diode, the 7th diode, the 8th diode, the 6th capacitor, the 11st capacitor and the tenth
Two capacitors；
5th diode, the 6th diode, the 7th diode and the 8th diode are connected with each other to constitute rectifier bridge；
6th capacitor, the 11st capacitor and the 12nd capacitor are used to adjust the electric current of LED load；
One end of 6th capacitor connects the cathode of the 6th diode, and the other end connects input rectification circuit；
One end of 11st capacitor and the 12nd capacitor connects the cathode of the 7th diode, the lamp of other end connecting tube
Foot.
5. being used for the LED drive circuit of T-type fluorescent tube as described in claim 1, which is characterized in that the compatible electronic ballast
Control circuit includes the tenth capacitor, the 9th diode, twelfth resistor, eleventh resistor, the 9th capacitor, voltage-stabiliser tube and three poles
Pipe；
After tenth capacitor, the 9th diode and twelfth resistor are sequentially connected in series, one end and compatible electronic ballast circuit connect
It connects, the base stage connection of the other end and triode；
After the eleventh resistor, the 9th capacitor, voltage-stabiliser tube are in parallel, the base stage of one end and triode is connected, other end ground connection；
The collector of the triode connects PWM control integrated circuit, emitter ground connection.
6. being used for the LED drive circuit of T-type fluorescent tube as described in claim 1, which is characterized in that the integrated electricity of PWM control
Road includes PWM chip, the 7th resistance, the second diode, the 5th capacitor, 3rd resistor and the 4th resistance；
The PWM chip is separately connected chip power supply circuit, Buck-Boost circuit and ground terminal, and passes through the parallel with one another the 7th
Resistance and the second diode connect Buck-Boost circuit, pass through third by the 4th resistance eutral grounding by the 5th capacity earth
Resistance connects chip power supply circuit and Buck-Boost circuit.
7. being used for the LED drive circuit of T-type fluorescent tube as claimed in claim 6, which is characterized in that the PWM chip is
JW1725；
The PWM chip is equipped with chip power pin, driving pin, current sense pin, ground pin, loop compensation pin
And loop feedback pin；
The chip power pin connects chip power supply circuit, and the driving pin passes through the 7th resistance and second parallel with one another
Diode connects Buck-Boost circuit, and the current sense pin connects Buck-Boost circuit, the ground pin connection
Floating ground, the loop compensation pin pass through the 5th capacity earth and are coupled to the output of error amplifier in PWM chip, the ring
Road feedback pin connects floating ground by the 4th resistance and connects chip power supply circuit and Buck-Boost circuit by 3rd resistor.
8. being used for the LED drive circuit of T-type fluorescent tube as claimed in claim 6, which is characterized in that the PWM chip is
SY5830；
The PWM chip is equipped with chip power pin, driving pin, output current sample pin, ground pin, loop compensation
Pin, inductance zero current detection pin；
The chip power pin connects chip power supply circuit, and the driving pin passes through the 7th resistance and second parallel with one another
Diode connects Buck-Boost circuit, and the output current sample pin connects Buck-Boost circuit, the ground pin
Connection ground, the loop compensation pin passes through the 5th capacity earth and is coupled to the output of error amplifier in PWM chip, described
Inductance zero current detection pin by the 4th resistance eutral grounding and connects chip power supply circuit by 3rd resistor.
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| CN201710452641.4A CN107148113B (en) | 2017-06-15 | 2017-06-15 | A kind of LED drive circuit for T-type fluorescent tube |
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| CN107148113B true CN107148113B (en) | 2019-04-26 |
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| CN109245750A (en) * | 2018-10-18 | 2019-01-18 | 珠海格力电器股份有限公司 | Driving circuit, power optimization device and the photovoltaic system of floating ground switching tube |
| CN110139428A (en) * | 2019-04-20 | 2019-08-16 | 王欣怡 | It is a kind of to switch the LED light that be used in series with silicon controlled sound control |
| WO2021088114A1 (en) * | 2019-11-04 | 2021-05-14 | 佛山电器照明股份有限公司 | T-shaped tube-based led drive circuit |
| US11350501B2 (en) | 2019-11-04 | 2022-05-31 | Foshan Electrical and Lighting Co., Ltd | LED driving circuit based on t-shaped lamp tube |
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| CN202918541U (en) * | 2012-09-24 | 2013-05-01 | 宁波凯耀电器制造有限公司 | LED drive circuit compatible with fluorescent lamp ballast |
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| CN105828470A (en) * | 2016-01-15 | 2016-08-03 | 厦门佰明光电股份有限公司 | Wide-voltage, fully-compatible, self-adaptive and single/double-end LED tube |
| CN205726557U (en) * | 2016-05-09 | 2016-11-23 | 陈文军 | A kind of compatible LED circuit |
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| CN202918541U (en) * | 2012-09-24 | 2013-05-01 | 宁波凯耀电器制造有限公司 | LED drive circuit compatible with fluorescent lamp ballast |
| CN104754823A (en) * | 2015-02-13 | 2015-07-01 | 广州市莱帝亚照明科技有限公司 | Electronic ballast based LED lamp tube |
| CN204795749U (en) * | 2015-07-03 | 2015-11-18 | 佛山电器照明股份有限公司 | LED drive circuit of compatible sub - ballast of high frequency electric and low frequency input |
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