CN205491311U - LED drive circuit of compatible electronic rectifier and commercial power - Google Patents

Abstract

The utility model discloses a LED drive circuit of compatible electronic rectifier and commercial power, including the main circuit, the commercial power switches on branch road and electronic rectifier and switches on the branch road, the commercial power switch on the branch road with electronic rectifier switches on the branch road and connects respectively the main circuit, wherein, electronic rectifier switches on the high frequency detection circuitry that high -frequency alternating current that the branch road crosses, allows electronic rectifier including the low -frequency AC electric flux that prevents the commercial power passes through, through carrying out the frequency detection to incoming signal for ECG and commercial power can drive LED through different branch roads, realize the compatibility of ECG and commercial power, have solved compatible limited problem, circuit safe and reliable.

Description

A kind of compatible electronic commutator and the LED drive circuit of civil power

Technical field

This utility model relates to LED technical field, particularly relates to a kind of compatible electronic commutator and civil power LED drive circuit.

Background technology

At present, the drive circuit main flow of LED lamp tube on the market has two big classes: a class is compatible electronic The circuit of commutator (ECG), this type of circuit is compatible limited due to the various existence of the model of ECG Problem；One class is the circuit worked under the input of civil power, and this two classes circuit all cannot the most compatible ECG And civil power.

Utility model content

The problem existed for prior art, it is whole that the purpose of this utility model is to propose a kind of compatible electronic Stream device and the LED drive circuit of civil power, this circuit can the most compatible ECG and the input signal of civil power, Solving compatible limited problem, circuit safety is reliable.

For reaching this purpose, this utility model by the following technical solutions:

A kind of compatible electronic commutator and the LED drive circuit of civil power, it is characterised in that including: main electricity Road, civil power conducting branches and electron rectifier conducting branches, described civil power conducting branches and described electronics are whole Stream device conducting branches connects described main circuit respectively, and wherein, described electron rectifier conducting branches includes resistance Only the low frequency ac of civil power by, allow the high-frequency detection electricity that the high-frequency alternating current of electron rectifier passes through Road.

Wherein, described frequency detection circuit includes the high pass allowing the high-frequency alternating current of electron rectifier to pass through Wave filter, described high pass filter includes electric capacity C2, C3 and resistance R7, and one end of R7 connects C2's One end, the other end of R7 connects one end of C3.

Wherein, described electron rectifier conducting branches also includes open loop protection circuit, described open-circuit-protection electricity Road includes IGCT Q4, resistance R1, R11, electric capacity C7 and stabilivolt ZD2, and the anode of ZD2 connects One end of R11, the other end of R11 connects the gate pole of Q4, one end of R1 and C7 connects the gate pole of Q4, The other end of R1 and C7, the minus earth of Q4.

Wherein, described electron rectifier conducting branches also includes commutator DB1, mu balanced circuit, metal-oxide-semiconductor Q2, turn off the branch road of described civil power conducting branches when described LED drive circuit is electron rectifier input Breaking circuit, described mu balanced circuit includes resistance R8, R9, R10, electric capacity C4, C5, C6 and voltage stabilizing Pipe ZD1, ZD3, described branch road breaking circuit includes that one end of metal-oxide-semiconductor Q3, described electric capacity C2 connects One input of described commutator DB1, one end of C3 connects another input of DB1, described The cathode output end of DB1 connects one end of R8, C4, C5, R9 and the negative electrode of ZD2 respectively, DB1's Cathode output end, the other end ground connection of R8, C4 and C5, the other end of R9 connects one end of C6 respectively With the negative electrode of ZD1, ZD3, the other end of C6 and the plus earth of ZD1, the anode of ZD3 connects respectively One end of R10, the grid of Q2 and the grid of Q3, the other end ground connection of R10, the drain electrode of Q2 connects The negative input of LED, the source ground of Q2 and Q3.

Wherein, described civil power conducting branches include resistive-capacitive voltage divider circuit, drive circuit, metal-oxide-semiconductor Q1 and Reduction voltage circuit, the outfan of described resistive-capacitive voltage divider circuit and described branch road breaking circuit connects described driving electricity The input on road, the outfan of described drive circuit connects the grid of Q1, and the drain electrode of Q1 connects described fall Volt circuit.

Wherein, described civil power conducting branches specifically include resistance R2, R3, R4, R5, R12, R13, R14, R15, R16, R17, R18, R19, R20 and R21, electrochemical capacitor C12, electric capacity C13, C14, diode D6, D7 and D8, driving chip U1, transformator T1 and metal-oxide-semiconductor Q1, R2's One end connects the negative electrode of D8 and the electrode input end of LED respectively, and the other end of R2 connects one end of R3, The other end of R3 connects one end of R4, the other end of R4 connect respectively one end of R5, the positive pole of C12, One end of C13 and the pin 5 of U1, the drain electrode of Q3, the negative pole of C12 and another termination of electric capacity C13 Ground, the pin 1 of U1 connects one end of R18, and the other end of R18 connects R19, R20 and R21 respectively One end, the other end ground connection of R19, R20 and R21, pin 2 ground connection of U1, the pin 3 of U1 Ground connection after being connected by C14 and R14, the other end of described R5 connects the negative electrode of D6, the anode of D6 Connect the Same Name of Ends of the secondary coil of T1 and one end of R12 respectively, the different name termination of the secondary coil of T1 Ground, the different name end of the primary coil of T1 connects the anode of D8 and the drain electrode of Q1 respectively, the primary line of T1 The Same Name of Ends of circle connects negative pole and the negative input of described LED of C10 respectively, and the other end of R12 divides Not Lian Jie R13 one end and the pin 4 of U1, the other end ground connection of R13, the pin 6 of U1 connects respectively One end of R15 and D7 negative electrode, the other end of R15 connects the grid of Q1, and the anode of D7 connects R16 One end, the other end of R16 connects the grid of Q1 and one end of R17 respectively, and the other end of R17 is even Connect one end of the source electrode of Q1, R19.

Wherein, described main circuit includes fuse, LC filter circuit, common mode inductance L2, rectifier bridge, π Type filter circuit and output circuit, the input of described fuse connects the input of described LED drive circuit End, the outfan of described fuse connects the input of described LC filter circuit, described LC filter circuit Outfan connect the input of L2, the outfan of L2 connects the input of described rectifier bridge, described whole The outfan of stream bridge connects the input of described π type filter circuit, the outfan of described π type filter circuit Connecting the input of described output circuit, the outfan of described output circuit connects LED, and described high frequency is filtered Wave circuit connects the outfan of described common mode inductance L2, and described resistive-capacitive voltage divider circuit connects the filtering of described π type The outfan of circuit.

Wherein, described LC filter circuit includes inductance L1 and electric capacity C1, and the two ends of C1 are connected to On two inputs of LED drive circuit, one end of L1 connects one end of C1.

Wherein, described fuse, rectifier bridge, π type filter circuit and output circuit include fuse F1, F2, F3 and F4, electric capacity C8, C9 and C11, electrochemical capacitor C10, inductance L5, commutation diode D1, D2, D3 and D4 and resistance R6, two live wire inputs of described LED drive circuit pass through F1 respectively With connect one end of C1 after F2, two zero line inputs are respectively by connecting C1 after F3 and F4 The other end, one end of L1 connects one end of C1, and the other end of L1 connects an input of L2, To the outfan of input connecting the anode of D1 and the negative electrode of D2 respectively, the other end of C1 connects Another input of L2, to the outfan of input connecting the anode of D3 and the moon of D4 respectively Pole, the negative electrode of D1 and D3 connects one end of C8 and one end of L5 respectively, the plus earth of D2 and D4, The other end of L5 connects one end of C9 and the positive pole of LED respectively, the other end ground connection of C8 and C9, C10 Positive pole, one end of C11 and R6 connects the positive pole of LED respectively, the negative pole of C10, C11's and R6 The other end connects the negative pole of LED respectively, and one end of described electric capacity C2 connects an outfan of L2, C2 The other end connect the input of DB1, one end of C3 connects another outfan of L2, C3's The other end connects another input of DB1, and the anode of Q4 connects the negative electrode of D3.

What the technical scheme that this utility model provides was brought has the beneficial effect that

Compatible electronic commutator of the present utility model and the LED drive circuit of civil power, including main circuit, city Conducting branch road and electron rectifier conducting branches, described civil power conducting branches and described electron rectifier are led Logical branch road connects described main circuit respectively, and wherein, described electron rectifier conducting branches includes stoping civil power Low frequency ac by, allow the frequency detection circuit that passes through of high-frequency alternating current of electron rectifier；Logical Cross and input signal is carried out frequency detecting so that ECG and civil power can be driven by different branch roads LED, it is achieved ECG and the compatibility of civil power, solves compatible limited problem, and circuit safety is reliable.

Accompanying drawing explanation

Fig. 1 is the circuit block diagram of the LED drive circuit that this utility model detailed description of the invention provides.

Fig. 2 is the circuit of the main circuit of the LED drive circuit that this utility model detailed description of the invention provides Figure.

Fig. 3 is the civil power conducting branches of the LED drive circuit that this utility model detailed description of the invention provides Circuit diagram.

Fig. 4 is the electricity of the electron rectifier of the LED drive circuit that this utility model detailed description of the invention provides Lu Tu.

Fig. 5 is the circuit diagram of the LED drive circuit that this utility model detailed description of the invention provides.

Detailed description of the invention

Further illustrate technical side of the present utility model below in conjunction with the accompanying drawings and by detailed description of the invention Case.

Seeing Fig. 1 to Fig. 5, Fig. 1 is the compatible electronic rectification that this utility model detailed description of the invention provides The circuit block diagram of the LED drive circuit of device and civil power, Fig. 2 is that this utility model detailed description of the invention carries The compatible electronic commutator of confession and the circuit diagram of the LED drive circuit of civil power, Fig. 3 is this utility model tool The circuit diagram of the civil power conducting branches of the LED drive circuit that body embodiment provides, Fig. 4 is that this practicality is new The circuit diagram of the electron rectifier of the LED drive circuit that type detailed description of the invention provides, Fig. 5 is this practicality The circuit diagram of the LED drive circuit that novel detailed description of the invention provides.

A kind of compatible electronic commutator and the LED drive circuit of civil power, it is characterised in that including: main electricity Road 10, civil power conducting branches 20 and electron rectifier conducting branches 30, described civil power conducting branches 20 Connecting described main circuit 10 respectively with described electron rectifier conducting branches 30, wherein, described electronics is whole Stream device conducting branches 30 includes the high frequency stoping the low frequency ac of civil power to pass through, allow electron rectifier The frequency detection circuit 31 that alternating current passes through.

Main circuit 10 is compatible ECG and the public circuit of civil power, and the output signal of ECG is high-frequency ac letter Number, the signal of the output of civil power is low frequency ac, and frequency detection circuit 31 is used for detecting this LED and drives The frequency of the input signal of circuit, stops the low frequency ac of civil power to pass through, allow the height of electron rectifier Frequently alternating current passes through, and when this LED drive circuit is civil power input, signal can not be by high-frequency detection electricity LED is sent to from civil power conducting branches 20 in road 31；When this LED drive circuit is ECG input, signal leads to Cross frequency detection circuit 31 and send to LED from ECG conducting branches 30, thus realize holding concurrently of ECG and civil power Hold.

Wherein, described frequency detection circuit 31 includes allowing the high-frequency alternating current of electron rectifier to pass through High pass filter, described high pass filter includes electric capacity C2, C3 and resistance R7, and one end of R7 connects One end of C2, the other end of R7 connects one end of C3.

Wherein, described electron rectifier conducting branches 30 also includes open loop protection circuit 33, described open circuit Protection circuit 33 includes IGCT Q4, resistance R1, R11, electric capacity C7 and stabilivolt ZD2, ZD2's Anode connects one end of R11, and the other end of R11 connects the gate pole of Q4, one end of R1 and C7 connects The gate pole of Q4, the other end of R1 and C7, the minus earth of Q4.

When circuit is in no-load condition, the output voltage of ECG is up to 800 1000V, if unprotected Measure circuit may be burned out, and open loop protection circuit 33 comes real by IGCT Q4 and stabilivolt ZD2 Existing open-circuit-protection, high voltage reverse breakdown stabilivolt ZD2 so that the gate voltage of IGCT Q4 reaches It turns on threshold values, and IGCT Q4 turns on, and is locked in by the output voltage of the rectifier bridge 14 of main circuit 10 The conduction voltage drop of Q4, protection circuit will not be damaged, and improves the safety coefficient of circuit simultaneously.

Wherein, described electron rectifier conducting branches 30 also includes commutator DB1, mu balanced circuit, MOS Pipe Q2, described LED drive circuit be electron rectifier input time turn off described civil power conducting branches Branch road breaking circuit, described mu balanced circuit includes resistance R8, R9, R10, electric capacity C4, C5, C6 and Stabilivolt ZD1, ZD3, described branch road breaking circuit includes metal-oxide-semiconductor Q3, one end of described electric capacity C2 Connecting an input of described commutator DB1, one end of C3 connects another input of DB1, The cathode output end of described DB1 connects one end of R8, C4, C5, R9 and the negative electrode of ZD2, DB1 respectively Cathode output end, the other end ground connection of R8, C4 and C5, the other end of R9 connects the one of C6 respectively End and the negative electrode of ZD1, ZD3, the other end of C6 and the plus earth of ZD1, the anode of ZD3 connects respectively Connecing one end of R10, the grid of Q2 and the grid of Q3, the other end ground connection of R10, the drain electrode of Q2 is even Connect the negative input of LED, the source ground of Q2 and Q3.

It, for stablizing the gate source voltage of metal-oxide-semiconductor Q2 and Q3, is shielded by mu balanced circuit 34, When ECG inputs, metal-oxide-semiconductor Q2 turns on, and the drain electrode of metal-oxide-semiconductor Q2 connects the negative pole of LED, constitutes ECG power circuit.

Wherein, described civil power conducting branches 20 includes resistive-capacitive voltage divider circuit 21, drive circuit 22, MOS Pipe Q123 and reduction voltage circuit 24, described resistive-capacitive voltage divider circuit 21 and described branch road breaking circuit 35 defeated Going out end and connect the input of described drive circuit 22, the outfan of described drive circuit 22 connects Q1's Grid, the drain electrode of Q1 connects described reduction voltage circuit 24.

Wherein, described civil power conducting branches 20 specifically include resistance R2, R3, R4, R5, R12, R13, R14, R15, R16, R17, R18, R19, R20 and R21, electrochemical capacitor C12, electric capacity C13, C14, diode D6, D7 and D8, driving chip U1, transformator T1 and metal-oxide-semiconductor Q1, R2's One end connects the negative electrode of D8 and the electrode input end of LED respectively, and the other end of R2 connects one end of R3, The other end of R3 connects one end of R4, the other end of R4 connect respectively one end of R5, the positive pole of C12, One end of C13 and the pin 5 of U1, the drain electrode of Q3, the negative pole of C12 and another termination of electric capacity C13 Ground, the pin 1 of U1 connects one end of R18, and the other end of R18 connects R19, R20 and R21 respectively One end, the other end ground connection of R19, R20 and R21, pin 2 ground connection of U1, the pin 3 of U1 Ground connection after being connected by C14 and R14, the other end of described R5 connects the negative electrode of D6, the anode of D6 Connect the Same Name of Ends of the secondary coil of T1 and one end of R12 respectively, the different name termination of the secondary coil of T1 Ground, the different name end of the primary coil of T1 connects the anode of D8 and the drain electrode of Q1 respectively, the primary line of T1 The Same Name of Ends of circle connects negative pole and the negative input of described LED of C10 respectively, and the other end of R12 divides Not Lian Jie R13 one end and the pin 4 of U1, the other end ground connection of R13, the pin 6 of U1 connects respectively One end of R15 and D7 negative electrode, the other end of R15 connects the grid of Q1, and the anode of D7 connects R16 One end, the other end of R16 connects the grid of Q1 and one end of R17 respectively, and the other end of R17 is even Connect one end of the source electrode of Q1, R19.

The driving chip U1 that civil power conducting branches 20 uses model to be SY5839 to drive metal-oxide-semiconductor Q1, When the voltage that the pin 5 of U1 inputs reaches to open threshold values, the pin 6 of U1 exports high level, Q1 Conducting, electric current flows through transformator T1 through Q1 to ground；The voltage inputted when the pin 5 of U1 is less than unlatching During threshold values, pin 6 output low level of U1, Q1 ends, and electric current flows through transformator through fly-wheel diode D8 forms loop.The working condition of Q1 is controlled by controlling the voltage of pin 5 of U1, wherein, The voltage of the pin 5 of U1 causes resistive-capacitive voltage divider circuit 21, and the drain electrode of Q1 connects reduction voltage circuit 24, fall Volt circuit 24 connects the output circuit 16 of main circuit 10, when Q1 on or off, and reduction voltage circuit 24 All can connect with output circuit 16, it is achieved thereby that the normal use under civil power initial conditions.

When ECG inputs, Q3 turns on, and the tube voltage drop of Q3 is carried in the pin 5 of driving chip U1, The level making the pin 5 of driving chip U1 reduces to zero, and the pin 6 of U1 fixes output low level, Q1 Being turned off, the pressure drop simultaneously making the secondary pole lateral coil of transformator T1 is zero, and T1 quits work, blood pressure lowering Circuit 24 disconnects with the output circuit of main circuit 10, and civil power conducting branches 20 quits work.

Wherein, described main circuit 10 include fuse 11, LC filter circuit 12, common mode inductance L213, Rectifier bridge 14, π type filter circuit 15 and output circuit 16, the input of described fuse 11 connects The input of described LED drive circuit, the outfan of described fuse 11 connects described LC filter circuit The input of 12, the outfan of described LC filter circuit 12 connects the input of L2, the outfan of L2 Connecting the input of described rectifier bridge 14, the outfan of described rectifier bridge 14 connects described π type filtered electrical The input on road 15, the outfan of described π type filter circuit 15 connects the defeated of described output circuit 16 Entering end, the outfan of described output circuit 16 connects LED, and described high-frequency filter circuit 31 connects described The outfan of common mode inductance L2, described resistive-capacitive voltage divider circuit 21 connects the output of described π type filter circuit End.

In main circuit 10, fuse 11 provides overcurrent protection, and LC filter circuit 12 is to civil power or ECG The power supply signal provided is filtered, and common mode inductance L2 is for filtering the electromagnetism of common mode in this power supply signal Interference signal, rectifier bridge 14 is for being converted to direct current signal by AC signal, and π type filter circuit 15 is used In the AC compounent filtered in this direct current signal so that the direct current signal ripple that rectification obtains is less, output Current signal after filtering is carried out further Filtering Processing by circuit 16, improves the anti-interference of circuit Ability, finally output DC powered LED.

Wherein, described LC filter circuit 12 includes inductance L1 and electric capacity C1, and the two ends of C1 connect respectively On two inputs of LED drive circuit, one end of L1 connects one end of C1.Inductance L1 can root Choosing of induction reactance is carried out, to improve this drive circuit compatibility to the ECG of different model according to the model of ECG Degree, reasonably selects electric capacity C1 can effectively reduce start peak voltage when EGC inputs.

Wherein, described fuse 11, rectifier bridge 14, π type filter circuit 15 and output circuit 16 wrap Include fuse F1, F2, F3 and F4, electric capacity C8, C9 and C11, electrochemical capacitor C10, inductance L5, Commutation diode D1, D2, D3 and D4 and resistance R6, two live wires of described LED drive circuit are defeated Enter end respectively by connecting one end of C1 after F1 and F2, two zero line inputs respectively by F3 and Connecting the other end of C1 after F4, one end of L1 connects one end of C1, and the other end of L1 connects L2's One input, to the outfan of input connecting the anode of D1 and the negative electrode of D2, C1 respectively The other end connect another input of L2, to the outfan of input connecting the sun of D3 respectively Pole and the negative electrode of D4, the negative electrode of D1 and D3 connects one end of C8 and one end of L5 respectively, D2 and The plus earth of D4, the other end of L5 connects one end of C9 and the positive pole of LED respectively, C8's and C9 Other end ground connection, the positive pole of C10, one end of C11 and R6 connects the positive pole of LED respectively, and C10's is negative Pole, the other end of C11 and R6 connects the negative pole of LED respectively, and one end of described electric capacity C2 connects L2 An outfan, the other end of C2 connects an input of DB1, and one end of C3 connects the another of L2 One outfan, the other end of C3 connects another input of DB1, and the anode of Q4 connects D3's Negative electrode.

Compatible electronic commutator of the present utility model and the LED drive circuit of civil power, including main circuit, city Conducting branch road and electron rectifier conducting branches, described civil power conducting branches and described electron rectifier are led Logical branch road connects described main circuit respectively, and wherein, described electron rectifier conducting branches includes stoping civil power Low frequency ac by, allow electron rectifier high-frequency alternating current pass through frequency detection circuit, open Road protection circuit and when ECG inputs turn off civil power conducting branches branch road breaking circuit；This LED drives Circuit is by carrying out frequency detecting to input signal so that ECG and civil power can be driven by different branch roads Dynamic LED, it is achieved ECG and the compatibility of civil power, solves compatible limited problem, can pass through simultaneously The ECG of regulation relevant parameter compatibility different model, circuit safety is reliable.

Know-why of the present utility model is described above in association with specific embodiment.These descriptions are intended merely to Explain principle of the present utility model, and can not be construed to by any way this utility model protection domain Limit.Based on explanation herein, those skilled in the art need not pay performing creative labour and can join Expecting other detailed description of the invention of the present utility model, these modes fall within protection of the present utility model Within the scope of.

Claims (9)

1. a compatible electronic commutator and the LED drive circuit of civil power, it is characterised in that including: main Circuit, civil power conducting branches and electron rectifier conducting branches, described civil power conducting branches and described electronics Commutator conducting branches connects described main circuit respectively, and wherein, described electron rectifier conducting branches includes Stop the low frequency ac of civil power by, allow the high-frequency detection passed through of high-frequency alternating current of electron rectifier Circuit.

LED drive circuit the most according to claim 1, it is characterised in that described high-frequency detection electricity Road includes the high pass filter allowing the high-frequency alternating current of electron rectifier to pass through, described high pass filter bag Including electric capacity C2, C3 and resistance R7, one end of R7 connects one end of C2, and the other end of R7 connects C3 One end.

LED drive circuit the most according to claim 2, it is characterised in that described electron rectifier Conducting branches also include open loop protection circuit, described open loop protection circuit include IGCT Q4, resistance R1, R11, electric capacity C7 and stabilivolt ZD2, the anode of ZD2 connects one end of R11, and the other end of R11 is even Connect the gate pole of Q4, one end of R1 and C7 connects the gate pole of Q4, the other end of R1 and C7, Q4 Minus earth.

LED drive circuit the most according to claim 3, it is characterised in that described electronic rectifier Device conducting branches also includes commutator DB1, mu balanced circuit, metal-oxide-semiconductor Q2, drives electricity at described LED Road is the branch road breaking circuit turning off described civil power conducting branches during electron rectifier input, described voltage stabilizing electricity Road includes resistance R8, R9, R10, electric capacity C4, C5, C6 and stabilivolt ZD1, ZD3, described branch road Breaking circuit includes that one end of metal-oxide-semiconductor Q3, described electric capacity C2 connects of described commutator DB1 Input, one end of C3 connects another input of DB1, and the cathode output end of described DB1 is respectively Connect one end of R8, C4, C5, R9 and the negative electrode of ZD2, the cathode output end of DB1, R8, C4 and The other end ground connection of C5, the other end of R9 connects one end of C6 and the negative electrode of ZD1, ZD3, C6 respectively The other end and the plus earth of ZD1, the anode of ZD3 connects the grid of one end of R10, Q2 respectively With the grid of Q3, the other end ground connection of R10, the drain electrode of Q2 connects the negative input of LED, Q2 Source ground with Q3.

LED drive circuit the most according to claim 4, it is characterised in that described city conducts props up Road includes resistive-capacitive voltage divider circuit, drive circuit, metal-oxide-semiconductor Q1 and reduction voltage circuit, described resistive-capacitive voltage divider electricity The outfan of road and described branch road breaking circuit connects the input of described drive circuit, described drive circuit Outfan connect the grid of Q1, the drain electrode of Q1 connects described reduction voltage circuit.

LED drive circuit the most according to claim 5, it is characterised in that described city conducts Branch road specifically include resistance R2, R3, R4, R5, R12, R13, R14, R15, R16, R17, R18, R19, R20 and R21, electrochemical capacitor C12, electric capacity C13, C14, diode D6, D7 and D8, Driving chip U1, transformator T1 and metal-oxide-semiconductor Q1, one end of R2 connects negative electrode and the LED of D8 respectively Electrode input end, the other end of R2 connects one end of R3, and the other end of R3 connects one end of R4, The other end of R4 connect respectively one end of R5, the positive pole of C12, one end of C13 and U1 pin 5, The drain electrode of Q3, the negative pole of C12 and the other end ground connection of electric capacity C13, the pin 1 of U1 connects R18 One end, the other end of R18 connects one end of R19, R20 and R21, R19, R20 and R21 respectively Other end ground connection, pin 2 ground connection of U1, the pin 3 of U1 connected by C14 and R14 after ground connection, The other end of described R5 connects the negative electrode of D6, and the anode of D6 connects the of the same name of the secondary coil of T1 respectively End and one end of R12, the different name end ground connection of the secondary coil of T1, the different name end of the primary coil of T1 divides Not connecting the anode of D8 and the drain electrode of Q1, the Same Name of Ends of the primary coil of T1 connects the negative of C10 respectively Pole and the negative input of described LED, the other end of R12 connects the pin 4 of R13 one end and U1 respectively, The other end ground connection of R13, the pin 6 of U1 connects one end and the D7 negative electrode of R15 respectively, and R15's is another One end connects the grid of Q1, and the anode of D7 connects one end of R16, and the other end of R16 connects respectively The grid of Q1 and one end of R17, the other end of R17 connects the source electrode of Q1, one end of R19.

Circuit the most according to claim 5, it is characterised in that described main circuit include fuse, LC filter circuit, common mode inductance L2, rectifier bridge, π type filter circuit and output circuit, described fuse Input connect the input of described LED drive circuit, the outfan of described fuse connects described LC The input of filter circuit, the outfan of described LC filter circuit connects the input of L2, the output of L2 End connects the input of described rectifier bridge, and the outfan of described rectifier bridge connects described π type filter circuit Input, the outfan of described π type filter circuit connects the input of described output circuit, described output The outfan of circuit connects LED, and described high-frequency filter circuit connects the outfan of described common mode inductance L2, Described resistive-capacitive voltage divider circuit connects the outfan of described π type filter circuit.

LED drive circuit the most according to claim 7, it is characterised in that described LC filtered electrical Road includes inductance L1 and electric capacity C1, and the two ends of C1 are connected to two inputs of LED drive circuit On, one end of L1 connects one end of C1.

LED drive circuit the most according to claim 8, it is characterised in that described fuse, whole Stream bridge, π type filter circuit and output circuit include fuse F1, F2, F3 and F4, electric capacity C8, C9 And C11, electrochemical capacitor C10, inductance L5, commutation diode D1, D2, D3 and D4 and resistance R6, Two live wire inputs of described LED drive circuit connect one end of C1 after passing through F1 and F2 respectively, Two zero line inputs are respectively by connecting the other end of C1 after F3 and F4, one end of L1 connects C1 One end, the other end of L1 connects an input of L2, to should the outfan of input connect respectively Connecing the anode of D1 and the negative electrode of D2, the other end of C1 connects another input of L2, to should be defeated The outfan entering end connects the anode of D3 and the negative electrode of D4 respectively, and the negative electrode of D1 and D3 connects respectively One end of C8 and one end of L5, the plus earth of D2 and D4, the other end of L5 connects C9's respectively One end and the positive pole of LED, the other end ground connection of C8 and C9, the positive pole of C10, one end of C11 and R6 Connect the positive pole of LED respectively, the negative pole of C10, the other end of C11 and R6 connects the negative pole of LED respectively, One end of described electric capacity C2 connects an outfan of L2, and one of the other end connection DB1 of C2 defeated Entering end, one end of C3 connects another outfan of L2, and another of the other end connection DB1 of C3 is defeated Entering end, the anode of Q4 connects the negative electrode of D3.