CN108347809A - A kind of LED drive circuit of compatible electronic ballast - Google Patents
A kind of LED drive circuit of compatible electronic ballast Download PDFInfo
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- CN108347809A CN108347809A CN201810331893.6A CN201810331893A CN108347809A CN 108347809 A CN108347809 A CN 108347809A CN 201810331893 A CN201810331893 A CN 201810331893A CN 108347809 A CN108347809 A CN 108347809A
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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]
Abstract
The invention discloses a kind of LED drive circuit of compatible electronic ballast, which includes：First heater chain, for receiving first voltage signal by electric ballast and being converted to second voltage signal, output to the first rectification circuit；Second heater chain, for receiving first voltage signal by electric ballast and being converted to tertiary voltage signal, output to isolation circuit；Isolation circuit, for forming the 4th voltage signal, output to the first rectification circuit according to tertiary voltage signal control relay；First rectification circuit forms Rectified alternating current for carrying out rectifying and wave-filtering to second voltage signal and tertiary voltage signal.Driving circuit provided in an embodiment of the present invention realizes the electrical isolation of the first heater chain and the second heater chain by a relay, can reduce the complexity of circuit structure, and cost is relatively low.
Description
Technical field
The present embodiments relate to light emitting diode LED lighting technical field more particularly to a kind of compatible electronic ballasts
LED drive circuit.
Background technology
Currently, existing LED constant current source, is connected directly with electric ballast, and due to electric ballast
The signal that output end is exported is high frequency ac signal, when electric ballast matching fluorescent lamp normal work, electric ballast
The high-frequency ac voltage of output is up to 380-600V/25-80KHz, and high-frequency ac voltage is directly accessed LED module, can lead to LED
Fluorescent tube is broken down by high-voltage to be burned with the constant-current source in LED drive circuit.
To solve the above-mentioned problems, include frequently with LED light source drive control circuit at present：Input circuit and switch electricity
Road, wherein input circuit includes two groups of heater chains and rectification circuit, and two groups of heater chains receive the height of electron rectifier output
Frequency AC signal obtains LED required voltages letter by being exported after rectifier circuit rectifies to switching circuit by switching circuit
Number.However, in order to make the protection of the pick-up current of two groups of heater chains meet IEC62776 security regulations Valuation Standards, it is necessary to two
Isolation circuit is installed between group heater chain.But existing isolation circuit usually requires two relays and could realize two groups of lamps
Electrical isolation between silk circuit makes pick-up current protection meet IEC62776 security regulations Valuation Standards, the first device used
Part is more, and the complexity of circuit structure is higher, and cost is higher.
Invention content
The present invention provides a kind of LED drive circuit of compatible electronic ballast, can reduce the complexity of circuit structure, at
This is relatively low.
The embodiment of the present invention proposes a kind of LED drive circuit of compatible electronic ballast, including：Input circuit and isolation electricity
Road；Wherein, input circuit includes：First heater chain, the second heater chain and the first rectification circuit；The isolation circuit packet
It includes：Relay；
First heater chain, for receiving first voltage signal by electric ballast and being converted to second voltage letter
Number, output to first rectification circuit；
Second heater chain, for receiving first voltage signal by electric ballast and being converted to tertiary voltage letter
Number, output to the isolation circuit；
The isolation circuit forms the 4th voltage signal for controlling the relay according to the tertiary voltage signal,
It exports to first rectification circuit；
First rectification circuit, for carrying out rectification filter to the second voltage signal and the tertiary voltage signal
Wave forms Rectified alternating current.
The LED drive circuit of compatible electronic ballast provided in an embodiment of the present invention, the first heater chain, for passing through electricity
Sub-ballast receives first voltage signal and is converted to second voltage signal, output to the first rectification circuit；Second heater chain,
For receiving first voltage signal by electric ballast and being converted to tertiary voltage signal, output to isolation circuit；Isolation electricity
Road, for forming the 4th voltage signal, output to the first rectification circuit according to tertiary voltage signal control relay；First rectification
Circuit forms Rectified alternating current for carrying out rectifying and wave-filtering to second voltage signal and tertiary voltage signal.The embodiment of the present invention
The driving circuit of offer realizes the electrical isolation of the first heater chain and the second heater chain by a relay, can drop
The complexity of low circuit structure, cost are relatively low.
Description of the drawings
Fig. 1 is the structure diagram of the LED drive circuit of the compatible electronic ballast in the embodiment of the present invention one；
Fig. 2 is the structure diagram of the LED drive circuit of the compatible electronic ballast in the embodiment of the present invention one；
Fig. 3 is the circuit diagram of the LED drive circuit of the compatible electronic ballast in the embodiment of the present invention two.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is the structure diagram of the LED drive circuit for the compatible electronic ballast that the embodiment of the present invention one provides, this implementation
Example is applicable to driving LED lamp tube, as shown in Figure 1, the LED drive circuit of compatible electronic ballast includes mainly：Input circuit
10 and isolation circuit 20；Wherein, input circuit includes：First heater chain 101, the second heater chain 102 and the first rectified current
Road 103；Isolation circuit 20 includes：Relay.
Electric ballast 30 connects mains supply, and mains supply is by being converted to first voltage letter after electric ballast 30
Number and second voltage signal, wherein first voltage signal and second voltage signal are high-frequency voltage signal.
First heater chain 101, for passing through the reception first voltage signal of electric ballast 30 and being converted to second voltage
Signal, output to first rectification circuit 103.First heater chain 101 is to hinder first voltage signal with LED load
Anti- matching.Second heater chain 102, for passing through the reception first voltage signal of electric ballast 30 and being converted to tertiary voltage letter
Number, output to the isolation circuit 20；Second heater chain 102 is that second voltage signal and LED load are carried out impedance matching.
Isolation circuit 20, for forming the 4th voltage signal, output to the first rectified current according to tertiary voltage signal control relay 201
Road 103.First rectification circuit 103 forms arteries and veins for carrying out rectifying and wave-filtering to second voltage signal and the tertiary voltage signal
Dynamic direct current.
Fig. 2 is the structure diagram of the LED drive circuit of the compatible electronic ballast in the embodiment of the present invention one, such as Fig. 2 institutes
Show, input circuit 10 further includes：Second rectification circuit 104；Wherein, the first input end and the first lamp of the second rectification circuit 104
The output end of the output end connection of silk circuit 101, the second input terminal of the second rectification circuit 104 and the second heater chain 102 connects
It connects, for carrying out rectifying and wave-filtering to second voltage signal and tertiary voltage signal, forms the 5th voltage signal, electricity is extremely isolated in output
Road 20.
Further, input circuit 10 further includes：Regulator circuit 105, for keeping the output of the second rectification circuit 104
Five voltage signals are constant；Wherein, the input terminal of regulator circuit 105 is connect with the output end of the second rectification circuit 104；Regulator circuit
105 output end is connect with isolation circuit 20.
Further, input circuit 1 further includes：First fuse 106 and second fuse 107, in the first heater chain
101 output end is connect by first fuse 106 with the first input end of the first rectification circuit 103.In the second heater chain
102 output end is connect by second fuse 107 with the first input end of the second rectification circuit 105.106 He of first fuse
For second fuse 107 for carrying out overheat protector, it is more than 125 degrees Celsius to prevent temperature when fluorescent tube overcurrent inside lamp cap.Work as temperature
More than 125 degrees Celsius, first fuse 106 or second fuse 107 fuse degree, and then the input cut off the power, and play protection
The effect of electric ballast and LED lamp tube.
Further, as shown in Fig. 2, the LED drive circuit of compatible electronic ballast further includes：Switching circuit 40 and output
Circuit 50；The input terminal of switching circuit 40 is connect with the output end of the first rectification circuit 103, the output end of switching circuit 40 with it is defeated
Go out the input terminal of circuit 50；For Rectified alternating current to be converted to the 7th constant voltage signal of electric current；Output circuit 50 and LED
The load of lamp connects, for the 7th voltage signal to be filtered, the load of output the 8th voltage signal driving LED light.
Further, isolation circuit 20 further includes：First coupled capacitor 202；Wherein, the first of the first coupled capacitor 202
End is connect with the first input end of the first rectification circuit 101, the second end of the first coupled capacitor 202 and the second rectification circuit 104
First input end connection.
The LED drive circuit of compatible electronic ballast provided in this embodiment, the first heater chain, for passing through electronics town
Stream device receives first voltage signal and is converted to second voltage signal, output to the first rectification circuit；Second heater chain, is used for
First voltage signal is received by electric ballast and is converted to tertiary voltage signal, output to isolation circuit；Isolation circuit is used
In forming the 4th voltage signal according to tertiary voltage signal control relay, export to the first rectification circuit；First rectification circuit,
For carrying out rectifying and wave-filtering to second voltage signal and tertiary voltage signal, Rectified alternating current is formed.Drive provided in this embodiment
Dynamic circuit realizes the electrical isolation of the first heater chain and the second heater chain by a relay, can reduce circuit knot
The complexity of structure, cost are relatively low.
Embodiment two
Fig. 3 is the circuit diagram of the LED drive circuit of the compatible electronic ballast in the embodiment of the present invention two, and the present embodiment exists
On the basis of the various embodiments described above, the LED drive circuit of compatible electronic ballast has been advanced optimized.As shown in figure 3, input electricity
Road includes the first heater chain, the second heater chain, the first rectification circuit, the second rectification circuit and regulator circuit.
Electric ballast 30 connects mains supply, i.e., the power-frequency voltage signal that voltage is 220V, frequency is 50HZ, alternating current electricity
Source is by being converted to first voltage signal and second voltage signal after electric ballast 30, wherein first voltage signal and the
Two voltage signals are high-frequency voltage signal.
First heater chain includes：First simulation filament L1, first resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4, the first capacitance C1 and the second capacitance C2；Wherein, the first end of the first simulation filament L1 and with electron rectifier first
Output end connects, and the second end of the first simulation filament L1 and the second output terminal of electron rectifier connect；The of first resistor R1
One end is connect with the first end of the first end of second resistance R2, the first end of the first capacitance C1 and the first simulation filament L1 respectively；
The first end of 3rd resistor R3 simulates filament L1 with the first end of the 4th resistance R4, the first end of the second capacitance C2 and first respectively
Second end connection；The second end of first resistor R1 respectively with the second end of second resistance R2, the second end of the first capacitance C1,
The second end of three resistance R3, the second end of the 4th resistance R4, the second end of the second capacitance C2 and the first rectification circuit it is first defeated
Enter end connection.First heater chain, for receiving first voltage signal by electric ballast and being converted to second voltage signal,
It exports to the first rectification circuit.Specifically, output voltage and LED load of first heater chain for carrying out electron rectifier
Impedance matching can enhance the compatibility of electric ballast.
Further, pass through the first defeated of first fuse F1 and the first rectification circuit in the output end of the first heater chain
Enter end connection.
Second heater chain includes：Second simulation filament L2, thirteenth resistor R13, the 14th resistance R14, the 15th electricity
Hinder R15, the 16th resistance R16, the tenth capacitance C10 and the 11st capacitance C11；Wherein, the first end of the second simulation filament L2 and
It is connect with the third output end of electron rectifier, the second end of the second simulation filament L2 and the 4th output end of electron rectifier connect
It connects；The first end of thirteenth resistor R13 respectively with the first end of the 14th resistance R14, the first end and second of the tenth capacitance C10
Simulate the first end connection of filament L2；The first end of 15th resistance R15 respectively with the first end of the 16th resistance R16, the tenth
The first end of one capacitance C11 is connected with the second end of the second simulation filament L2；The second end of thirteenth resistor R13 is respectively with the tenth
The of the second end of four resistance R14, the second end of the tenth capacitance C10, the second end of the 15th resistance R15, the 16th resistance R16
Two ends, the 11st capacitance C11 second end connected with the first input end of the second rectification circuit.Second heater chain, for leading to
It crosses electric ballast to receive first voltage signal and be converted to tertiary voltage signal, output to the second rectification circuit.Specifically, the
Two heater chains are used to carry out the impedance matching of the output voltage and LED load of electron rectifier, can enhance electric ballast
Compatibility.
Further, pass through the first defeated of second fuse F2 and the second rectification circuit in the output end of the second heater chain
Enter end connection.First fuse F1 and second fuse F2 is for carrying out overheat protector, when preventing fluorescent tube overcurrent inside lamp cap
Temperature is more than 125 degrees Celsius.When temperature is more than 125 degrees Celsius, first fuse F1 or second fuse F2 fuse, and then cut off
The input of power supply is played the role of protecting electric ballast and LED lamp tube.
First rectification circuit includes：First diode D1, the second diode D2, third diode D3, the 4th diode D4,
8th capacitance C8, the 17th resistance R17 and 18 resistance R18；Wherein, the cathode of the first diode D1 and the second diode D2
Cathode connects；The anode of first diode D1 is connect with the output end of the cathode of the 4th diode D4 and the first heater chain, the
The anode of two diode D2 is connect with the output end of the cathode of third diode D3 and isolation circuit, the anode of third diode D3
It is connect with the anode of the 4th diode D4；The first end of 8th capacitance C8 is connect with the cathode of the second diode D2, the 8th capacitance
The second end of C8 is connect with the anode of third diode D3；The first end of the first end of 17th resistance R17 and 18 resistance R18
Connection, the second end of the 17th resistance R17 are connect with the anode of third diode D3, the other end and the diode D2 of resistance R13
Cathode connection.
Second rectification circuit includes：5th diode D5, the 6th diode D6, the 7th diode D7, the 8th diode D8
With the 9th capacitance C9；Wherein, the cathode of the 5th diode D5 is connect with the cathode of the 6th diode D6；The sun of 5th diode D5
Pole is connect with the output end of the cathode of the 8th diode D8 and the second heater chain, the anode of the 6th diode D6 and the seven or two pole
The cathode of pipe D7 is connected with the output end of isolation circuit, and the anode of the 7th diode D7 is connect with the anode of the 8th diode D8；
The first end of 9th capacitance C9 is connect with the cathode of the 6th diode D6, and the second end of the 9th capacitance C9 is with the 7th diode D7's
Anode connects.
Regulator circuit includes：5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first zener diode ZD1, first
Field-effect tube M1 and third capacitance C3；Wherein, the first end of the 5th resistance R5 first end and second with the 7th resistance R7 respectively
First output end of rectification circuit connects, and the second end of the 5th resistance R5 is connect with the first end of the 6th resistance R6；First effect
Should the drain electrode of pipe M1 connect with the second end of the 7th resistance R7, the grid of the first field-effect tube M1 respectively with the 6th resistance R6
Two ends are connected with the cathode of the first zener diode ZD1, and the source electrode of the first field-effect tube M1 connects with the first end of third capacitance C3
It connects；The second end of the anode and the 5th capacitance C5 of first zener diode ZD4 is grounded respectively.
Further, LED circuit further includes isolation circuit, and isolation circuit includes relay KT and the first coupled capacitor CY1；
The first end of first coupled capacitor CY1 is connect with the first input end of the first rectification circuit, the second end of the first coupled capacitor CY1
It is connect with the first input end of the second rectification circuit.
Relay including six terminals be respectively first terminal K1, Second terminal K2, third terminal K3, forth terminal K4,
5th terminal K5 and the 6th terminal K6；First output end of first terminal K1 and regulator circuit connects, Second terminal K2 and voltage stabilizing
The second output terminal of circuit connects；Third terminal K3 is connect with the output end of the second heater chain；Forth terminal K4 and first is whole
Second input terminal of current circuit connects；5th terminal is connect with the 6th terminal.
Further, the relay usually manufactured in electrical arrangement usually has 8 terminals, in embodiments of the present invention,
Only six terminals therein are used.Remaining two terminals are vacantly handled.
Further, the normally opened relay used in the present embodiment.In embodiments of the present invention when electric ballast
When four output ends all have high-frequency voltage signal output, wherein the voltage signal of the first output end and second output terminal output,
The first input end of the second rectification circuit, third output end are carried out after the first filament match circuit and the first coupled capacitor
With the voltage signal of the 4th output end output, inputted by carry out the second rectification circuit after the second filament match circuit second
End, two input terminals of the second rectification circuit can input voltage signal, which carries out whole by the second rectification circuit
After stream filtering and regulator circuit carry out voltage stabilizing, control relay KT is attracted.At this point, third terminal K3 and the 5th terminal K5 are closed
It closes, forth terminal K4 and the 6th terminal K6 are closed.The voltage signal of the output end output of second heater chain passes through third terminal
The 5th terminal K5 of K3, forth terminal K4 and the 6th terminal K6 enter the second input terminal of the first rectification circuit.When two filament electricity
When road outputs voltage signal to the second rectification circuit simultaneously, relay KT is attracted, circuit turn-on.When arbitrary in two heater chains
One when cannot output voltage signal to the second rectification circuit, relay KT is in normally open, cannot be attracted, and circuit will not be led
It is logical, and then have the function that isolation, so that pick-up current protection is met IEC62776 security regulations Valuation Standards.
The LED drive circuit of compatible electronic ballast further includes：Switching circuit and output circuit.
Switching circuit includes：Second zener diode ZD2, third zener diode ZD3, the 4th zener diode ZD4,
Eight resistance R8, the 9th resistance R9, the 4th capacitance C4, the tenth resistance R10, eleventh resistor R11 and the first thyristor Q1；Wherein,
The cathode of second zener diode ZD2 is connect with the first input circuit, anode and the third voltage stabilizing two of the second zener diode ZD2
The cathode of pole pipe ZD3 connects, and the anode of third zener diode ZD3 is connect with the cathode of the 4th zener diode ZD4；First is brilliant
The control pole of brake tube Q1 respectively with the first end of the 8th resistance R8, the first end of the first end and the 4th capacitance C4 of the 9th resistance R9
Connection, the cathode of the first thyristor Q1 are connect with the second end of the second end of the 9th resistance R9 and the 4th capacitance C4；First brilliant lock
The anode of pipe Q1 is connect with the first end of eleventh resistor R11, and the of the second end of eleventh resistor R11 and the tenth resistance R10
One end connects, and the second end of the tenth resistance R10 and the cathode of the first thyristor Q1 are grounded respectively；The second end of 8th resistance R8 with
The anode of third zener diode ZD3 connects.
Output circuit includes：Twelfth resistor R12, the 5th capacitance C5, the 6th capacitance C6, the electrolysis of the 7th capacitance C7 and first
Capacitance CE1, wherein the first end of twelfth resistor R12 respectively with the first end of the 5th capacitance C5, the 6th capacitance C6 first
The anode connection at end, the first end of the 7th capacitance C7 and the first electrolytic capacitor CE1；The second end of twelfth resistor R12 respectively with
The second end of 5th capacitance C5, the second end of the 6th capacitance C6, the second end of the 7th capacitance C7 and the first electrolytic capacitor CE1 it is negative
Pole connects；The anode of first electrolytic capacitor CE1 is connect with the positive of LED light, the cathode of the first electrolytic capacitor CE1 and LED light
Cathode connects.
The LED drive circuit of the compatible electronic ballast provided in embodiments of the present invention is come real using a relay
Show the first heater chain and the second heater chain when four output ends of electric ballast all have high-frequency voltage signal output,
The voltage signal of wherein the first output end and second output terminal output, by the first filament match circuit and the first coupled capacitor it
The first input end of the second rectification circuit, the voltage signal of third output end and the output of the 4th output end, by second are carried out afterwards
The second input terminal of the second rectification circuit is carried out after filament match circuit, two input terminals of the second rectification circuit can input
Voltage signal, the voltage signal are carried out by the second rectification circuit after rectifying and wave-filtering and regulator circuit carry out voltage stabilizing, control after
Electric appliance is attracted.At this point, third terminal and the 5th terminal are closed, forth terminal and the 6th terminal are closed.Second heater chain it is defeated
The voltage signal of outlet output enters the of the first rectification circuit by the 5th terminal of third terminal, forth terminal and the 6th terminal
Two input terminals.When two heater chains output voltage signal to the second rectification circuit simultaneously, relay is attracted, circuit turn-on.
When any one in two heater chains cannot output voltage signal to the second rectification circuit, relay is in normally open,
It cannot be attracted, circuit does not turn on, and then has the function that isolation, so that pick-up current protection is met IEC62776 security regulations and recognizes
Card standard.The complexity of circuit structure can be reduced, cost is relatively low.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (10)
1. a kind of LED drive circuit of compatible electronic ballast, which is characterized in that including：Input circuit and isolation circuit；Its
In, input circuit includes：First heater chain, the second heater chain and the first rectification circuit；The isolation circuit includes：Relay
Device；
First heater chain, for receiving first voltage signal by electric ballast and being converted to second voltage signal,
It exports to first rectification circuit；
Second heater chain, for receiving first voltage signal by electric ballast and being converted to tertiary voltage signal,
It exports to the isolation circuit；
The isolation circuit forms the 4th voltage signal, output for controlling the relay according to the tertiary voltage signal
To first rectification circuit；
First rectification circuit, for carrying out rectifying and wave-filtering, shape to the second voltage signal and the tertiary voltage signal
At Rectified alternating current.
2. the LED drive circuit of compatible electronic ballast according to claim 1, which is characterized in that the input circuit
Further include：Second rectification circuit；Wherein,
The first input end of second rectification circuit is connect with the output end of first heater chain, second rectified current
Second input terminal on road is connect with the output end of second heater chain, for the second voltage signal and tertiary voltage
Signal carries out rectifying and wave-filtering, forms the 5th voltage signal, output to the isolation circuit.
3. the LED drive circuit of compatible electronic ballast according to claim 1, which is characterized in that the compatible electronic
The LED drive circuit of ballast further includes：Switching circuit and output circuit；
The input terminal of the switching circuit is connect with the output end of first rectification circuit, the output end of the switching circuit with
The input terminal of the output circuit；For the Rectified alternating current to be converted to the 7th constant voltage signal of electric current；
The load of the output circuit and LED light connects, for the 7th voltage signal to be filtered, output the 8th
Voltage signal drives the load of LED light.
4. the LED drive circuit of compatible electronic ballast according to claim 1, which is characterized in that first filament
Circuit includes：First simulation filament, first resistor, second resistance, 3rd resistor, the 4th resistance, the first capacitance and the second capacitance；
Wherein,
Described first simulates the first end of filament and is connect with the first output end of the electron rectifier, the first simulation lamp
The second end of silk is connect with the second output terminal of the electron rectifier；
The first end of the first resistor respectively with the first end of the second resistance, the first end of first capacitance and described
The first end connection of first simulation filament；
The first end of the 3rd resistor respectively with the first end of the 4th resistance, the first end and first of second capacitance
Simulate the first end connection of filament；
The second end of the first resistor respectively with the second end of the second resistance, second end of first capacitance, described
The second end of 3rd resistor, the second end of the 4th resistance, the second end of second capacitance and first rectification circuit
First input end connection.
5. the LED drive circuit of compatible electronic ballast according to claim 1, which is characterized in that the isolation circuit
Further include：First coupled capacitor；Wherein,
The first end of first coupled capacitor is connect with the first input end of first rectification circuit, the first coupling electricity
The second end of appearance is connect with the first input end of second rectification circuit.
6. the LED drive circuit of compatible electronic ballast according to claim 1, which is characterized in that the input circuit
Further include：Regulator circuit, for keeping the 5th voltage signal of the second rectification circuit output constant；Wherein, the voltage stabilizing
The input terminal of circuit is connect with the output end of second rectification circuit；The output end of the regulator circuit is in the isolation circuit
Connection.
7. the LED drive circuit of compatible electronic ballast according to claim 6, which is characterized in that the regulator circuit
Including：5th resistance, the 6th resistance, the 7th resistance, the first zener diode, the first field-effect tube and third capacitance；Wherein,
The first end of 5th resistance is defeated with the first of the first end of the 7th resistance and second rectification circuit respectively
Outlet connects, and the second end of the 5th resistance is connect with the first end of the 6th resistance；
The drain electrode of first field-effect tube is connect with the second end of the 7th resistance, the grid point of first field-effect tube
It is not connect with the cathode of the second end of the 6th resistance and the first zener diode, the source electrode of first field-effect tube and institute
State the first end connection of third capacitance；
The anode of first zener diode and the second end of the 5th capacitance are grounded respectively.
8. the LED drive circuit of compatible electronic ballast according to claim 1, which is characterized in that the relay packet
It is respectively first terminal, Second terminal, third terminal, forth terminal, the 5th terminal and the 6th terminal to include six terminals；
The first terminal is connect with the first output end of the regulator circuit, and the of the Second terminal and the regulator circuit
Two output ends connect；The third terminal is connect with the output end of second heater chain；The forth terminal and described the
Second input terminal of one rectification circuit connects；5th terminal is connect with the 6th terminal.
9. the LED drive circuit of compatible electronic ballast according to claim 3, which is characterized in that the switching circuit
Including：Second zener diode, third zener diode, the 4th zener diode, the 8th resistance, the 9th resistance, the 4th capacitance,
Tenth resistance, eleventh resistor and the first thyristor；Wherein,
The cathode of second zener diode is connect with first input circuit, the anode of second zener diode with
The cathode of the third zener diode connects, the moon of the anode of the third zener diode and the 4th zener diode
Pole connects；
The control pole of first thyristor respectively with the first end of the 8th resistance, the first end of the 9th resistance and institute
State the first end connection of the 4th capacitance, second end and fourth electricity of the cathode of first thyristor with the 9th resistance
The second end of appearance connects；The anode of first thyristor is connect with the first end of the eleventh resistor, the 11st electricity
The second end of resistance is connect with the first end of the tenth resistance, the moon of the second end and first thyristor of the tenth resistance
Pole is grounded respectively；The second end of 8th resistance is connect with the anode of the third zener diode.
10. the LED drive circuit of compatible electronic ballast according to claim 3, which is characterized in that the output circuit
Including：Twelfth resistor, the 5th capacitance, the 6th capacitance, the 7th capacitance and the first electrolytic capacitor, wherein
The first end of the twelfth resistor respectively with the first end, the first end of the 6th capacitance, institute of the 5th capacitance
State the first end of the 7th capacitance and the anode connection of first electrolytic capacitor；
The second end of the twelfth resistor respectively with the 5th capacitance second end, second end of the 6th capacitance, described
The second end of 7th capacitance is connected with the cathode of the first electrolytic capacitor；
The anode of first electrolytic capacitor is connect with the anode of LED light, the cathode of first electrolytic capacitor and bearing for LED light
Pole connects.
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| CN201810331893.6A CN108347809A (en) | 2018-04-13 | 2018-04-13 | A kind of LED drive circuit of compatible electronic ballast |
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| CN201810331893.6A CN108347809A (en) | 2018-04-13 | 2018-04-13 | A kind of LED drive circuit of compatible electronic ballast |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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