CN105451409B - The straight tube LED power of compatible inductance, electric ballast - Google Patents

The straight tube LED power of compatible inductance, electric ballast Download PDF

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Publication number
CN105451409B
CN105451409B CN201410522998.1A CN201410522998A CN105451409B CN 105451409 B CN105451409 B CN 105451409B CN 201410522998 A CN201410522998 A CN 201410522998A CN 105451409 B CN105451409 B CN 105451409B
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China
Prior art keywords
inductance
circuit
connect
resistance
capacitance
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CN201410522998.1A
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Chinese (zh)
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CN105451409A (en
Inventor
叶飞文
刘振华
付玉峰
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惠州Tcl照明电器有限公司
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Abstract

The present invention relates to the straight tube LED powers of a kind of compatible inductance, electric ballast, including a sequentially connected at least rectification circuit, filter circuit, circuit of power factor correction, switching circuit, Buck conversion circuit and the pulse-width modulation circuit being connect respectively with filter circuit and switching circuit, each rectification circuit is connected with two incoming ends, and Buck conversion circuit has the output end for connecting LED load.It is compatible with the alternating current accessed in the straight tube LED power of inductance, electric ballast and passes through rectifier circuit rectifies, filter circuit filters, circuit of power factor correction improves power factor, switching circuit, pulse-width modulation circuit and Buck conversion circuit export stable voltage and current to LED light, prevent the instantaneous pressure exported by ballast from burning out LED light to extend its service life.

Description

The straight tube LED power of compatible inductance, electric ballast

Technical field

The present invention relates to technical field of LED light illumination, more particularly to a kind of compatible inductance, the straight tube of electric ballast LED power.

Background technology

Fluorescent lamp be it is a kind of using hypobaric mercury vapour after powered up excitated fluorescent powder and send out the headlamp of visible light Tool, was once used widely.Fluorescent lamp in the prior art includes:Fluorescent tube, starter, electronic type or inductor formula town Flow device.However, including toxic metals mercury and fluorescent powder in fluorescent lamp, the serious dirt to environment is caused in its production and after discarding Dye, in addition, the light that fluorescent lamp is sent out affects vision with scintillation.

Compared with fluorescent lamp, LED light has many advantages, such as low energy consumption, long lifespan, asepsis environment-protecting, is increasingly liked by user Love, it has been trend of the times that LED light, which gradually replaces fluorescent lamp,.Also due to holders such as T4, T5, T8 for commonly adapting to fluorescent tube Largely exist, re-replaces and need to spend larger manpower and materials suitable for LED lamp holder and circuit, therefore, it is necessary to one kind In the case where not dismantling original electric ballast or Inductive ballast, the LED light electricity of the holders such as T4, T5, T8 can be adapted to Source circuit.

Instantaneous pressure of traditional LED light power circuit due to being difficult to bear ballast, be easy to cause the damage of LED light, Influence the service life of LED light.

Invention content

Based on this, it is necessary to provide it is a kind of can bear instantaneous pressure impact compatibility inductance, electric ballast straight tube LED power.

A kind of straight tube LED power of compatible inductance, electric ballast, including:A sequentially connected at least rectification circuit, filter Wave circuit, circuit of power factor correction, switching circuit, Buck conversion circuit and respectively with the filter circuit and described open The pulse-width modulation circuit of powered-down road connection, each rectification circuit are connected with two incoming ends, and the Buck conversion circuit has The first output end for connecting LED load and second output terminal;

The rectification circuit is used to export direct current signal extremely after the AC signal that two incoming ends receive is carried out rectification The filter circuit;

The filter circuit be used for by the direct current signal high frequency waves and clutter filter out rear output smoothing signal to institute State circuit of power factor correction and the pulse-width modulation circuit;

The circuit of power factor correction after the phase difference of voltage and electric current in the smooth signal for reducing exporting school Electrical signals are to the switching circuit;

The pulse-width modulation circuit is for persistently generating pulse signal to the switching circuit;

The switching circuit for responding the pulse signal, alternate communication and disconnect the circuit of power factor correction and Connection between the Buck conversion circuit;

The Buck conversion circuit for will the correction electric signal carry out buck chopper after export to described first defeated Go out and the second output terminal.

In one embodiment, the rectification circuit is two, and the rectification circuit is rectifying full bridge;

Two ac input ends of the rectifying full bridge are connect with two incoming ends respectively, and direct current positive output end and direct current are born defeated Outlet is connect with the filter circuit respectively.

In one embodiment, the filter circuit includes:First common mode inductance, the first inductance, the second inductance, first Capacitance, the second capacitance, the 17th resistance and the 18th resistance,

One end of first coil and one end of the second coil connect with the rectification circuit in first common mode inductance Connect, in first common mode inductance other end of the other end and the second coil of first coil respectively with first inductance One end and the connection of one end of second inductance;

First inductance is connect with the 17th resistor coupled in parallel, second inductance and the 18th resistor coupled in parallel Connection, one end of first inductance are connect by first capacitance with one end of second inductance, first inductance The other end connect with the other end of second inductance by second capacitance;

The other end of second inductance is connect with ground terminal;

The other end of the other end of first inductance and second inductance connects with the circuit of power factor correction It connects, the other end of first inductance is also connect with the pulse-width modulation circuit.

In one embodiment, the circuit of power factor correction includes:First diode, the second diode, third Diode, the first polar capacitor, the second polar capacitor, first resistor and second resistance,

First polar capacitor anode and cathode respectively with the other end of first inductance and the described 3rd 2 The cathode of pole pipe connects, and the anode of the third diode is connect with the other end of second inductance;

The cathode of first diode and anode respectively with the other end of first inductance and second polarity The anode connection of capacitance, the cathode of second polar capacitor are connect with the other end of second inductance;

Second diode anode and cathode respectively with the cathode of the third diode and the one or two pole The anode connection of pipe;

The first resistor is connected in parallel with first polar capacitor, the second resistance and second polar capacitor It is connected in parallel;

The cathode of first diode is connect with the switching circuit.

In one embodiment, the switching circuit includes:Field-effect tube, the 4th diode, the 7th capacitance, the 11st Capacitance, the 12nd capacitance, the tenth resistance, twelfth resistor, variable resistance, thirteenth resistor, the 16th resistance and the 19th Resistance,

The source electrode of the field-effect tube is connect by the thirteenth resistor with ground terminal, the source electrode of the field-effect tube also according to Secondary to be connect with ground terminal by the variable resistance, the twelfth resistor, the 7th capacitance is in parallel with the twelfth resistor Connection;

The cathode of 4th diode and anode respectively with the pulse-width modulation circuit and the grid of the field-effect tube Pole connects, and the grid of the field-effect tube is connect by the 19th resistance with ground terminal, the tenth resistance and the described 4th Diodes in parallel connects;

The drain electrode of the field-effect tube passes sequentially through the 12nd capacitance, the 16th resistance and the one or two pole The cathode of pipe connects, and the drain electrode of the field-effect tube is also connect with the Buck conversion circuit;

11st capacitance is connect with the drain electrode of the field-effect tube and source electrode respectively.

In one embodiment, the pulse-width modulation circuit includes:Drive IC, third capacitance, the 4th capacitance, the 5th electricity Appearance, the 6th capacitance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance,

The high input voltage foot of the driving IC passes sequentially through the 5th resistance, the 4th resistance and first inductance The other end connection;

The oscillator control foot of the driving IC passes sequentially through the 8th resistance, the 9th resistance and the driving IC Driving FET grid foot connection and connect with ground terminal by the 7th resistance, it is described drive IC driving field-effect Tube grid foot is connect with the cathode of the 4th diode;

The current sense feedback foot of the driving IC is connect by the twelfth resistor with ground terminal, and the driving IC's connects Lower margin is connect with ground terminal, and the interior voltage-stabilized power supply voltage foot of the driving IC passes through the third capacitance and the described 4th in parallel Capacitance is connect with ground terminal, and the interior voltage-stabilized power supply voltage foot of the driving IC also passes sequentially through the 6th resistance, institute in parallel It states the 5th capacitance and the 6th capacitance is connect with ground terminal, the pulsewidth modulation foot of the threshold value foot of the driving IC and the driving IC It is connect with ground terminal by the 5th capacitance after connection.

In one embodiment, the Buck conversion circuit includes:5th diode, the 6th diode, third pole Property capacitance and third inductance,

5th diode is connected in parallel with the 6th diode homopolarity, the cathode of the 5th diode with it is described The anode connection of the cathode of first diode and the third polar capacitor, anode and the field of the 5th diode are imitated Should the drain electrode of pipe and one end connection of the third inductance, the other end of the third inductance and the third polar capacitor Cathode connects;

The both ends of the third polar capacitor are connect with first output end and the second output terminal respectively.

In one embodiment, further include the second common mode inductance,

In second common mode inductance in one end of first coil and second common mode inductance the second coil one end point It is not connect with the both ends of the third polar capacitor;

In second common mode inductance in the other end of first coil and second common mode inductance the second coil it is another End is connect with first output end and the second output terminal respectively.

In one embodiment, further include the 9th capacitance, the tenth capacitance, the first varistor and the second varistor MOV2,

9th capacitance respectively with an ac input end of a rectifying full bridge and another rectifying full bridge One ac input end connects, the tenth capacitance respectively with another ac input end of a rectifying full bridge and another described Another ac input end of rectifying full bridge connects;

First varistor is connected to two ac input ends of a rectifying full bridge;Second varistor connects It is connected between two ac input ends of another rectifying full bridge.

In one embodiment, further include overvoltage crowbar, the overvoltage crowbar includes:First voltage stabilizing, two pole Pipe, the second zener diode, bidirectional triode thyristor, the 14th resistance, the 15th resistance and the 8th capacitance,

The anode of the bidirectional triode thyristor is connect with first output end, the cathode of the bidirectional triode thyristor and described the Two output ends connect, and the 8th capacitance connect with the 15th resistor coupled in parallel, one end of the 8th capacitance and described pair It is connected to silicon-controlled cathode, the control that the other end of the 8th capacitance passes through the 14th resistance and the bidirectional triode thyristor Pole connection processed, the anode of first zener diode are connect with the cathode of second zener diode, first voltage stabilizing The cathode of diode is connect with the anode of the bidirectional triode thyristor, anode and the 8th capacitance of second zener diode The other end connection.

Above-mentioned compatible inductance, electric ballast straight tube LED power in the alternating current that accesses pass through rectifier circuit rectifies, filtering Circuit filtering, circuit of power factor correction improve power factor, switching circuit, pulse-width modulation circuit and Buck conversion circuit Stable voltage and current is exported to LED light, prevents the instantaneous pressure exported by ballast from burning out LED light, to extend LED light Service life.

Description of the drawings

Fig. 1 is that the circuit structure of the straight tube LED power of the compatibility inductance of a preferred embodiment of the present invention, electric ballast shows It is intended to;

Fig. 2 is the circuit structure of the straight tube LED power of the compatibility inductance of another embodiment of the present invention, electric ballast Schematic diagram.

Specific implementation mode

As shown in Figure 1, it is the compatibility inductance of a preferred embodiment of the present invention, the straight tube LED power 10 of electric ballast Structural schematic diagram, including:First rectification circuit 210, the second rectification circuit 220, filter circuit 300, PFC electricity Road 400, switching circuit 500, pulse-width modulation circuit 600 and Buck conversion circuit 700, filter circuit 300, power factor school Positive circuit 400, switching circuit 500 and Buck conversion circuit 700 are sequentially connected, pulse-width modulation circuit 600 respectively with filtering Circuit 300 and switching circuit 500 connect, and the first rectification circuit 210 is connected with the first incoming end 110 and the second incoming end 120, the Two rectification circuits 220 are connected with third incoming end 130 and the 4th incoming end 140, and Buck conversion circuit 700 has for connecting The first output end 810 and second output terminal 820 of LED load.

The AC signal that first rectification circuit 210 is used to receive the first incoming end 110 and the second incoming end 120 carries out whole Direct current signal is exported after stream to filter circuit 300, similarly, the second rectification circuit 220 is for connecing third incoming end 130 and the 4th Enter after the AC signal that end 140 receives carries out rectification and exports direct current signal to filter circuit 300.

In practical applications, since the both ends of traditional Fluorescent Light and Fixtures are respectively set, there are two powered electrodes, and first connects Enter end 110 and the second incoming end 120 is connect with two powered electrodes of wherein one end respectively, third incoming end 130 and the 4th connects Enter end 140 to connect with two powered electrodes of the other end respectively.It can be as needed selectively by the first incoming end 110 and second Incoming end 120 accesses alternating current, or third incoming end 130 and the 4th incoming end 140 are accessed alternating current.

In the present embodiment, said so that the first rectification circuit 210 and the second rectification circuit 220 are rectifying full bridge as an example Bright, the first rectification circuit 210 includes:Diode D1, diode D2, diode D3 and diode D4;Second rectification circuit 220 Including:Diode D5, diode D6, diode D7 and diode D8.Two ac input ends of the first rectification circuit 210 are distinguished It is connect with the first incoming end 110 and the second incoming end 120, two ac input ends of the second rectification circuit 220 connect with third respectively Enter end 130 and the 4th incoming end 140 connect, the direct current positive output end and direct current negative output terminal of the first rectification circuit 210 respectively with Filter circuit 300 connects, the direct current positive output end and direct current negative output terminal of the second rectification circuit 220 respectively with filter circuit 300 Connection.

Filter circuit 300 be used for by direct current signal high frequency waves and clutter filter out rear output smoothing signal to power factor Correcting circuit 400 and pulse-width modulation circuit 600.

Filter circuit 300 includes:First common mode inductance L1, the first inductance L2, the second inductance L3, the first capacitance C1, second Capacitance C2, the 17th resistance R19 and the 18th resistance R20.

The direct current positive output end of one end of first coil 301 and the first rectification circuit 210 and the in first common mode inductance L1 The direct current positive output end of two rectification circuits 220 connects, the other end and the first inductance of first coil 301 in the first common mode inductance L1 One end of L2 connects.The direct current negative output terminal of one end of the second coil 302 and the first rectification circuit 210 in first common mode inductance L1 It is connected with the direct current negative output terminal of the second rectification circuit 220, the other end and second of the second coil 302 in the first common mode inductance L1 One end of inductance L3 connects.First inductance L2 and the 17th resistance R19 is connected in parallel, the second inductance L3 and the 18th resistance R20 It is connected in parallel, one end of the first inductance L2 is connect by the first capacitance C1 with one end of the second inductance L3, and the first inductance L2's is another One end is connect by the second capacitance C2 with the other end of the second inductance L3.The other end of second inductance L3 is grounded.First inductance L2 The other end and the other end of the second inductance L3 connect with circuit of power factor correction 400, the other end of the first inductance L2 is also It is connect with pulse-width modulation circuit 600.Wherein, the first common mode inductance L1 plays the role of filtering high frequency signals, in setting for circuit board In meter, the effect of EMI filtering is also functioned to, the electromagnetic wave outside radiation for inhibiting to generate.

Circuit of power factor correction 400 is for reducing output calibration telecommunications after the phase difference of voltage and electric current in smooth signal Number to switching circuit 500.

Circuit of power factor correction 400 includes:First diode D9, the second diode D10, third diode D11, first Polar capacitor C3, the second polar capacitor C4, first resistor R1 and second resistance R2.

The anode and cathode of first polar capacitor C3 respectively with the other end of the first inductance L2 and third diode D11 Cathode connects, and the anode of third diode D11 is connect with the other end of the second inductance L3.The cathode and anode of first diode D9 It is connect respectively with the anode of the other end of the first inductance L2 and the second polar capacitor C4, the cathode of the second polar capacitor C4 and the The other end of two inductance L3 connects.The anode and cathode of second diode D10 respectively with the cathode of third diode D11 and the The anode connection of one diode D9.First resistor R1 is connected in parallel with the first polar capacitor C3, second resistance R2 and the second polarity Capacitance C4 is connected in parallel, and the cathode of the first diode D9 is connect with switching circuit 500.

When the voltage that filter circuit 300 exports is higher, the first polar capacitor C3 and the second polar capacitor C4 are with concatenated side Formula charges, and output current is to switching circuit 500;The voltage that filter circuit 300 exports is less than the first polar capacitor C3 and second When voltage on polar capacitor C4, the second diode D10 reverse bias, the first polar capacitor C3 and the second polar capacitor C4 difference It is discharged by first resistor R1 and second resistance R2, is improved by the phase difference of voltage and electric current in the smooth signal of reduction Power factor realizes energy-efficient effect to improve the active power of LED light.

Pulse-width modulation circuit 600 is for persistently generating pulse signal to switching circuit 500.

Switching circuit 500 is used for response impulse signal, alternate communication and disconnection circuit of power factor correction 400 and buck Connection between translation circuit 700.

Switching circuit 500 includes:Field-effect tube Q1, the 4th diode D14, the 7th capacitance C8, the 11st capacitance C13, 12 capacitance C14, the tenth resistance R10, twelfth resistor R12, variable resistance RT, thirteenth resistor Rx, the 16th resistance R18 with And the 19th resistance R21.

The source electrode of field-effect tube Q1 is connect by thirteenth resistor Rx with ground terminal, and the source electrode of field-effect tube Q1 also passes sequentially through Variable resistance RT, twelfth resistor R12 are connect with ground terminal, and the 7th capacitance C8 and twelfth resistor R12 is connected in parallel.Four or two pole The cathode and anode of pipe D14 is connect with the grid of pulse-width modulation circuit 600 and field-effect tube Q1 respectively, the grid of field-effect tube Q1 Pole is connect by the 19th resistance R21 with ground terminal, and the tenth resistance R10 and the 4th diode D14 is connected in parallel.Field-effect tube Q1's Drain electrode passes sequentially through the 12nd capacitance C14, the 16th resistance R18 is connect with the cathode of the first diode D9, field-effect tube Q1's Drain electrode is also connect with Buck conversion circuit 700.The both ends of 11st capacitance C13 respectively with the drain electrode of field-effect tube Q1 and source electrode Connection.In the present embodiment, thirteenth resistor Rx includes:Resistance R13, resistance R14 and resistance R15, resistance R13, resistance R14 with And resistance R15 is connected in parallel.The both ends variable resistance RT are also parallel with eleventh resistor R11.

Pulse-width modulation circuit 600 includes:Drive IC, third capacitance C5, the 4th capacitance C6, the 5th capacitance C7A, the 6th capacitance C7B, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9.This reality It applies in example, driving IC is the integrated circuit of SQ9910 models.

The high input voltage foot Vin of integrated circuit SQ9910 passes sequentially through the 5th resistance R5, the 4th resistance R4 and the first inductance The other end of L2 connects.The oscillator control foot Rosc of integrated circuit SQ9910 passes sequentially through the 8th resistance R8, the 9th resistance R9 It connect with the driving FET grid foot GATE of integrated circuit SQ9910 and is connect with ground terminal by the 7th resistance R7, integrated The driving FET grid foot GATE of circuit SQ9910 is connect with the cathode of the 4th diode D14.Integrated circuit SQ9910's Current sense feedback foot CS is connect by twelfth resistor R12 with ground terminal, and grounding leg GND and the ground terminal of integrated circuit SQ9910 connect It connects, the interior voltage-stabilized power supply voltage foot VDD of integrated circuit SQ9910 passes through third capacitance C5 and the 4th capacitance C6 in parallel and ground The interior voltage-stabilized power supply voltage foot VDD of end connection, integrated circuit SQ9910 also passes sequentially through the 6th resistance R6, the in parallel the 5th electricity Hold C7A and the 6th capacitance C7B to connect with ground terminal, the pulsewidth tune of the threshold value foot LD and integrated circuit SQ9910 of integrated circuit SQ9910 It is connect with ground terminal by the 5th capacitance C7A after foot PWM_D connections processed.Further include 3rd resistor R3,3rd resistor in the present embodiment One end of R3 is connect with the anode of the first diode D9, and the other end of 3rd resistor R3 is connected to the 5th resistance R5 and the 4th resistance Between R4.

The pulse letter of the driving FET grid foot GATE outputs of integrated circuit SQ9910 is set by the 6th resistance R6 Number duty ratio size, the on and off time of control field-effect tube Q1.In the present embodiment, the pulse signal is square wave Signal.

Buck conversion circuit 700 for high-ranking officers' electrical signals carry out buck chopper after output to the first output end 810 with And second output terminal 820.In the present embodiment, the first output end 810 and second output terminal 820 are respectively used to connection external LED lamp Positive and negative anodes.

Buck conversion circuit 700 includes:5th diode D12, the 6th diode D13, third polar capacitor C9 and Third inductance Lx.

5th diode D12 is connected in parallel with the 6th diode D13 homopolarities, the cathode and the one or two of the 5th diode D12 The anode connection of the cathode and third polar capacitor C9 of pole pipe D9, the leakage of the anode and field-effect tube Q1 of the 5th diode D12 Pole and the connection of one end of third inductance Lx, the other end of third inductance Lx are connect with the cathode of third polar capacitor C9.Third The both ends of polar capacitor C9 are connect with the first output end 810 and second output terminal 820 respectively.Specifically, third inductance Lx packets It includes:Inductance L4, inductance L5 and inductance L6 and inductance L7, inductance L4, inductance L5, inductance L6 and inductance L7 are connected in series with, And it is connect respectively with the cathode of the anode of the 5th diode D12 and third polar capacitor C9.Above-mentioned Buck conversion circuit 700 Referred to as BUCK circuits.The energy storage when conducting of third inductance Lx scene effect pipes Q1, it is continuous to LED light when scene effect pipe Q1 ends Stream.Meanwhile third inductance Lx and third polar capacitor C9 form the more stable voltage and current of second-order filter system output to LED Lamp.

Further include the second common mode inductance L8 in the present embodiment.One end and second of first coil in second common mode inductance L8 One end of the second coil is connect with the both ends of third polar capacitor C9 respectively in common mode inductance L8.First in second common mode inductance L8 The other end of the second coil is exported with the first output end 810 and second respectively in the other end of coil and the second common mode inductance L8 820 connection of end.

Further include the 9th capacitance C11, the tenth capacitance C12, the first varistor MOV1 and second pressure-sensitive in the present embodiment Resistance MOV2.

9th capacitance C11 respectively with an ac input end of the first rectification circuit 210 and the second rectification circuit 220 one Ac input end connect, the tenth capacitance C12 respectively with another ac input end and the second rectified current of the first rectification circuit 210 Another ac input end on road 220 connects, and the first varistor MOV1 is connected to two ac input ends of the first rectification circuit 210 Between, the second varistor MOV2 is connected between two ac input ends of the second rectification circuit 220.

Further include first switch S1, second switch S2, the in the present embodiment for ease of controlling the energization and power-off of LED light Three switch S3 and the 4th switch S4.First switch S1 connects with an ac input end of the first rectification circuit 210 and first respectively Enter 110 connection of end;Second switch S2 connects with another ac input end of the first rectification circuit 210 and the second incoming end 120 respectively It connects;Third switch S3 is connect with an ac input end of the second rectification circuit 220 and third incoming end 130 respectively;4th switch S4 is connect with another ac input end of the second rectification circuit 220 and the 4th incoming end 140 respectively.First switch S1, second open Close S2, third switch S3 and the 4th switch S4 can be in button switch, toggle switch, audio-switch, the light-operated switches such as open the light Any one.

In other embodiments, connection is connected between an ac input end of the first rectification circuit 210 and the first incoming end 110 There is switch, switch is connected between the ac input end and third incoming end 130 of the second rectification circuit 220.

Electric current to prevent from flowing into the straight tube LED power 10 of compatible inductance, electric ballast is excessive to damage member therein Device further includes fuse F1, fuse F2 and fuse F3 in the present embodiment.Fuse F1 is connected to the first incoming end 110 and first rectification circuit 210 an ac input end between;Fuse F2 is connected to the second incoming end 120 and the first rectification Between another ac input end of circuit 210;Fuse F3 is connected to.In other embodiments, the first incoming end 110 and first It is connected with fuse between one ac input end of rectification circuit 210, the one of third incoming end 130 and the second rectification circuit 220 Fuse is connected between ac input end.

As shown in Fig. 2, it is the compatibility inductance of another embodiment of the present invention, the straight tube LED power of electric ballast 20 electrical block diagram.It is compatible with inductance, the straight tube LED power 20 of electric ballast includes compatible inductance, electric ballast Straight tube LED power 10 and overvoltage crowbar 900.

Overvoltage crowbar 900 includes:First zener diode ZD2, the second zener diode ZD3, bidirectional triode thyristor Q3, 14th resistance R16, the 15th resistance R17 and the 8th capacitance C10.

The anode of bidirectional triode thyristor is connect with the first output end, and the cathode of bidirectional triode thyristor is connect with second output terminal, tool Body, the anode and cathode of bidirectional triode thyristor Q3 is connect with the anode and cathode of third polar capacitor C9 respectively, the 8th capacitance C10 It is connected in parallel with the 15th resistance R17, one end of the oneth the 8th capacitance C10 is connect with the cathode of bidirectional triode thyristor Q3, the 8th electricity The other end for holding C10 is connect by the 14th resistance R16 with the control pole of bidirectional triode thyristor Q3, the first zener diode ZD2's The cathode of the second zener diode ZD3 of anode connects, and the cathode of the first zener diode ZD2 connects with the anode of bidirectional triode thyristor Q3 It connects, the anode of the second zener diode ZD3 is connect with the other end of the 8th capacitance C10.

The operation principle of above-mentioned overvoltage crowbar 900 is as follows:

When load is in the overtension of the anode of bidirectional triode thyristor Q3, the first zener diode ZD2 and the second voltage stabilizing two Pole pipe ZD3 breakdown, and to the 8th capacitance C10 chargings, the voltage at the 8th both ends capacitance C10 gradually rises so that bidirectional triode thyristor Q3 The current potential of control pole reach conducting threshold values, the anode and cathode of bidirectional triode thyristor Q3 realizes conducting, to be connected to first The positive and negative anodes short circuit of the LED light of output end 810 and second output terminal 820, prevents from burning out LED light because of overtension, play Press protective effect.

Above-mentioned compatible inductance, electric ballast straight tube LED power 10 in the alternating current that accesses pass through the first rectification circuit 210 Or 220 rectification of the second rectification circuit, filter circuit 300 filter, circuit of power factor correction 400 improves power factor, switch electricity Road 500, pulse-width modulation circuit 600 and Buck conversion circuit 700 export stable voltage and current to LED light, prevent because The instantaneous pressure of ballast output burns out LED light, to extend the service life of LED light.

Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.

Claims (9)

1. the straight tube LED power of a kind of compatible inductance, electric ballast, which is characterized in that including:Sequentially connected at least one is whole Current circuit, filter circuit, circuit of power factor correction, switching circuit, Buck conversion circuit and respectively with the filtered electrical The pulse-width modulation circuit that road is connected with the switching circuit, each rectification circuit are connected with two incoming ends, and the buck becomes Circuit is changed with the first output end and second output terminal for connecting LED load;
AC signal of the rectification circuit for receiving two incoming ends carries out after rectification output direct current signal to described Filter circuit;
The filter circuit be used for by the direct current signal high frequency waves and clutter filter out rear output smoothing signal to the work( Rate factor correcting circuit and the pulse-width modulation circuit;
The circuit of power factor correction is for reducing output calibration electricity after the phase difference of voltage and electric current in the smooth signal Signal is to the switching circuit;
The pulse-width modulation circuit is for persistently generating pulse signal to the switching circuit;
The switching circuit alternate communication and disconnects the circuit of power factor correction and described for responding the pulse signal Connection between Buck conversion circuit;
The Buck conversion circuit is used to after the correction electric signal is carried out buck chopper export to first output end With the second output terminal;
Wherein, the compatible inductance, electric ballast straight tube LED power further include overvoltage crowbar, the overvoltage protection Circuit includes:First zener diode, the second zener diode, bidirectional triode thyristor, the 14th resistance, the 15th resistance and Eight capacitances, the anode of the bidirectional triode thyristor are connect with first output end, the cathode of the bidirectional triode thyristor and described the Two output ends connect, and the 8th capacitance connect with the 15th resistor coupled in parallel, one end of the 8th capacitance and described pair It is connected to silicon-controlled cathode, the control that the other end of the 8th capacitance passes through the 14th resistance and the bidirectional triode thyristor Pole connection processed, the anode of first zener diode are connect with the cathode of second zener diode, first voltage stabilizing The cathode of diode is connect with the anode of the bidirectional triode thyristor, anode and the 8th capacitance of second zener diode The other end connection.
2. the straight tube LED power of compatible inductance according to claim 1, electric ballast, which is characterized in that the rectification Circuit is two, and the rectification circuit is rectifying full bridge;
Two ac input ends of the rectifying full bridge are connect with two incoming ends respectively, direct current positive output end and direct current negative output terminal It is connect respectively with the filter circuit.
3. the straight tube LED power of compatible inductance according to claim 1, electric ballast, which is characterized in that the filtering Circuit includes:First common mode inductance, the first inductance, the second inductance, the first capacitance, the second capacitance, the 17th resistance and the tenth Eight resistance,
One end of first coil and one end of the second coil are connect with the rectification circuit in first common mode inductance, institute State in the first common mode inductance the other end of the other end of first coil and the second coil one end with first inductance respectively And one end connection of second inductance;
First inductance is connect with the 17th resistor coupled in parallel, and second inductance connects with the 18th resistor coupled in parallel It connects, one end of first inductance is connect by first capacitance with one end of second inductance, first inductance The other end is connect by second capacitance with the other end of second inductance;
The other end of second inductance is connect with ground terminal;
The other end of the other end of first inductance and second inductance is connect with the circuit of power factor correction, institute The other end for stating the first inductance is also connect with the pulse-width modulation circuit.
4. the straight tube LED power of compatible inductance according to claim 3, electric ballast, which is characterized in that the power Factor correcting circuit includes:First diode, the second diode, third diode, the first polar capacitor, the second polar capacitor, First resistor and second resistance,
First polar capacitor anode and cathode respectively with the other end of first inductance and the third diode Cathode connection, the third diode anode connect with the other end of second inductance;
The cathode of first diode and anode respectively with the other end of first inductance and second polar capacitor Anode connection, the cathode of second polar capacitor connect with the other end of second inductance;
The anode and cathode of second diode respectively with the cathode of the third diode and first diode Anode connection;
The first resistor is connected in parallel with first polar capacitor, and the second resistance is in parallel with second polar capacitor Connection;
The cathode of first diode is connect with the switching circuit.
5. the straight tube LED power of compatible inductance according to claim 4, electric ballast, which is characterized in that the switch Circuit includes:Field-effect tube, the 4th diode, the 7th capacitance, the 11st capacitance, the 12nd capacitance, the tenth resistance, the 12nd electricity Resistance, variable resistance, thirteenth resistor, the 16th resistance and the 19th resistance,
The source electrode of the field-effect tube is connect by the thirteenth resistor with ground terminal, and the source electrode of the field-effect tube also leads to successively Cross the variable resistance, the twelfth resistor is connect with ground terminal, the 7th capacitance is connected in parallel with the twelfth resistor;
The cathode and anode of 4th diode connect with the pulse-width modulation circuit and the grid of the field-effect tube respectively It connects, the grid of the field-effect tube is connect by the 19th resistance with ground terminal, the tenth resistance and the four or two pole Pipe is connected in parallel;
The drain electrode of the field-effect tube passes sequentially through the 12nd capacitance, the 16th resistance and first diode Cathode connects, and the drain electrode of the field-effect tube is also connect with the Buck conversion circuit;
11st capacitance is connect with the drain electrode of the field-effect tube and source electrode respectively.
6. the straight tube LED power of compatible inductance according to claim 5, electric ballast, which is characterized in that the pulsewidth Modulation circuit includes:Drive IC, third capacitance, the 4th capacitance, the 5th capacitance, the 6th capacitance, the 4th resistance, the 5th resistance, the Six resistance, the 7th resistance, the 8th resistance and the 9th resistance,
It is another with first inductance that the high input voltage foot of the driving IC passes sequentially through the 5th resistance, the 4th resistance One end connects;
The oscillator control foot of the driving IC passes sequentially through the drive of the 8th resistance, the 9th resistance and the driving IC Dynamic fet gate foot is connected and is connect with ground terminal by the 7th resistance, the driving FET grid of the driving IC Pole foot is connect with the cathode of the 4th diode;
The current sense feedback foot of the driving IC is connect by the twelfth resistor with ground terminal, the grounding leg of the driving IC It is connect with ground terminal, the interior voltage-stabilized power supply voltage foot of the driving IC passes through the third capacitance in parallel and the 4th capacitance It is connect with ground terminal, the interior voltage-stabilized power supply voltage foot of the driving IC also passes sequentially through the 6th resistance, in parallel described the Five capacitances and the 6th capacitance are connect with ground terminal, and the threshold value foot of the driving IC is connect with the pulsewidth modulation foot of the driving IC It is connect afterwards with ground terminal by the 5th capacitance.
7. the straight tube LED power of compatible inductance according to claim 5, electric ballast, which is characterized in that the decompression Formula translation circuit includes:5th diode, the 6th diode, third polar capacitor and third inductance,
5th diode is connected in parallel with the 6th diode homopolarity, the cathode and described first of the 5th diode The anode connection of the cathode of diode and the third polar capacitor, anode and the field-effect tube of the 5th diode Drain electrode and the third inductance one end connection, the cathode of the other end of the third inductance and the third polar capacitor Connection;
The both ends of the third polar capacitor are connect with first output end and the second output terminal respectively.
8. the straight tube LED power of compatible inductance according to claim 7, electric ballast, which is characterized in that further include Two common mode inductances,
In second common mode inductance in one end of first coil and second common mode inductance one end of the second coil respectively with The both ends of the third polar capacitor connect;
In second common mode inductance in the other end of first coil and second common mode inductance the second coil the other end point It is not connect with first output end and the second output terminal.
9. the straight tube LED power of compatible inductance according to claim 2, electric ballast, which is characterized in that further include Nine capacitances, the tenth capacitance, the first varistor and the second varistor MOV2,
9th capacitance friendship with an ac input end of a rectifying full bridge and another rectifying full bridge respectively Flow input terminal connection, the tenth capacitance respectively with another ac input end of a rectifying full bridge and another rectification Another ac input end of full-bridge connects;
First varistor is connected to two ac input ends of a rectifying full bridge;Second varistor is connected to Between two ac input ends of another rectifying full bridge.
CN201410522998.1A 2014-09-29 2014-09-29 The straight tube LED power of compatible inductance, electric ballast CN105451409B (en)

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CN106385733B (en) * 2016-10-13 2018-02-27 厦门阳光恩耐照明有限公司 The LED daylight lamp drive circuit of compatible electronic formula, inductance type and alternating current
CN106793338A (en) * 2017-01-25 2017-05-31 浙江东元照明有限公司 The LED drive circuit of compatible various ballasts
CN106793432A (en) * 2017-03-08 2017-05-31 深圳金中誉电子科技有限公司 A kind of novel double end single-electrode fluorescent light electronic ballast circuit
CN106793349B (en) * 2017-03-21 2019-01-15 惠州桑尼伟太阳能科技有限公司 The protection circuit of booting moment impact over-voltage

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