CN105451409A - Straight tube LED power supply compatible with inductance/electronic ballast - Google Patents
Straight tube LED power supply compatible with inductance/electronic ballast Download PDFInfo
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- CN105451409A CN105451409A CN201410522998.1A CN201410522998A CN105451409A CN 105451409 A CN105451409 A CN 105451409A CN 201410522998 A CN201410522998 A CN 201410522998A CN 105451409 A CN105451409 A CN 105451409A
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Abstract
The invention relates to a straight tube LED power supply compatible with an inductance/electronic ballast. The straight tube LED power supply comprises at least one rectification circuit, a filtering circuit, a power factor correction circuit, a switch circuit, a buck conversion circuit and a pulse width modulation circuit connected with the filtering circuit and the switch circuit respectively, all of which are connected in sequence. Each rectification circuit is connected with two access ends. The buck conversion circuit is provided with an output end connected with an LED load. The commercial power connected with the straight tube LED power supply compatible with the inductance/electronic ballast is rectified by the rectification circuits and filtered by the filtering circuit, then the power factor correction circuit improves the power factor of the commercial power, and the switch circuit, the pulse width modulation circuit and the buck conversion circuit output a stable voltage and current to an LED lamp, so that the LED lamp is prevented from burned down by an instant high voltage output by the ballast, and the service lifetime of the LED lamp is prolonged.
Description
Technical field
The present invention relates to technical field of LED light illumination, particularly relate to the straight tube LED power of a kind of compatible inductance, electric ballast.
Background technology
Fluorescent lamp a kind ofly utilizes hypobaric mercury vapour excitated fluorescent powder and send the lighting of visible ray after powered up, was once used widely.Fluorescent lamp of the prior art comprises: fluorescent tube, starter, electronic type or inductor formula ballast.But include noxious metals mercury and fluorescent material in fluorescent lamp, cause the severe contamination to environment after it is produced and be discarded, in addition, the light that fluorescent lamp sends, with scintillation, affects one's power of vision.
Compared with fluorescent lamp, LED has the advantages such as low energy consumption, life-span length, asepsis environment-protecting, and be more and more subject to liking of user, it has been trend of the times that LED replaces fluorescent lamp gradually.Because the conventional supports such as T4, T5, T8 of fluorescent tube that adapt to also exist in a large number, again change and be applicable to LED lamp holder and circuit and need the manpower and materials that cost is larger, therefore, needing a kind of when not dismantling original electric ballast or Inductive ballast, the LED power circuit of the supports such as T4, T5, T8 can be adapted to.
Traditional LED power circuit, owing to being difficult to the instantaneous pressure bearing ballast, easily causes the damage of LED, affects the useful life of LED.
Summary of the invention
Based on this, be necessary that providing a kind of can bear the compatible inductance of instantaneous pressure impact, the straight tube LED power of electric ballast.
The straight tube LED power of a kind of compatible inductance, electric ballast, comprise: at least one rectification circuit connected successively, filter circuit, circuit of power factor correction, switching circuit, Buck conversion circuit and the pulse-width modulation circuit be connected with described filter circuit and described switching circuit respectively, each described rectification circuit is connected with two incoming ends, and described Buck conversion circuit has the output for connecting LED load;
Described rectification circuit exports direct current signal to described filter circuit after being used for that the AC signal that incoming end described in two receives is carried out rectification;
Described filter circuit is used for output smoothing signal after the high frequency waves in described direct current signal and clutter filtering to described circuit of power factor correction and described pulse-width modulation circuit;
Described circuit of power factor correction is for reducing the extremely described switching circuit of the output calibration signal of telecommunication after the phase difference of voltage and electric current in described smooth signal;
Described pulse-width modulation circuit is used for continuing to produce pulse signal to described switching circuit;
Described switching circuit for responding described pulse signal, alternate communication and the connection disconnected between described circuit of power factor correction and described Buck conversion circuit;
Described Buck conversion circuit exports described output to after being used for that the described correction signal of telecommunication is carried out buck chopper.
In one of them embodiment, described rectification circuit is two, and described rectification circuit is rectifying full bridge;
Two ac input ends of described rectifying full bridge are connected with two incoming ends respectively, and its direct current positive output end is connected with described filter circuit respectively with direct current negative output terminal.
In one of them embodiment, described filter circuit comprises: the first common mode inductance, the first inductance, the second inductance, the first electric capacity, the second electric capacity, the 17 resistance and the 18 resistance,
In described first common mode inductance, one end of the first coil and one end of the second coil are all connected with described rectification circuit, and in described first common mode inductance, the other end of the first coil and the other end of the second coil are connected with one end of described first inductance and one end of described second inductance respectively;
Described first inductance is connected with described 17 resistor coupled in parallel, described second inductance is connected with described 18 resistor coupled in parallel, one end of described first inductance is connected with one end of described second inductance by described first electric capacity, and the other end of described first inductance is connected with the other end of described second inductance by described second electric capacity;
The other end of described second inductance is held with ground and is connected;
The other end of described first inductance is all connected with described circuit of power factor correction with the other end of described second inductance, and the other end of described first inductance is also connected with described pulse-width modulation circuit.
In one of them embodiment, described circuit of power factor correction comprises: the first diode, the second diode, the 3rd diode, the first polar capacitor, the second polar capacitor, the first resistance and the second resistance,
The positive pole of described first polar capacitor is connected with the other end of described first inductance and the negative pole of described 3rd diode respectively with negative pole, and the positive pole of described 3rd diode is connected with the other end of described second inductance;
The negative pole of described first diode is connected with the other end of described first inductance and the positive pole of described second polar capacitor respectively with positive pole, and the negative pole of described second polar capacitor is connected with the other end of described second inductance;
The positive pole of described second diode is connected with the negative pole of described 3rd diode and the positive pole of described first diode respectively with negative pole;
Described first resistance and described first polar capacitor are connected in parallel, and described second resistance and described second polar capacitor are connected in parallel;
The negative pole of described first diode is connected with described switching circuit.
In one of them embodiment, described switching circuit comprises: field effect transistor, the 4th diode, the 7th electric capacity, the 11 electric capacity, the 12 electric capacity, the tenth resistance, the 12 resistance, variable resistor, the 13 resistance, the 16 resistance and the 19 resistance
The source electrode of described field effect transistor hold with ground by described 13 resistance and is connected, the source electrode of described field effect transistor also pass through successively described variable resistor, described 12 resistance with hold and be connected, described 7th electric capacity is connected with described 12 resistor coupled in parallel;
The negative pole of described 4th diode is connected with the grid of described pulse-width modulation circuit and described field effect transistor respectively with positive pole, the grid of described field effect transistor by described 19 resistance with hold and be connected, described tenth resistance is connected with described 4th diodes in parallel;
The drain electrode of described field effect transistor is connected with the negative pole of described first diode by described 12 electric capacity, described 16 resistance successively, and the drain electrode of described field effect transistor is also connected with described Buck conversion circuit;
Described 11 electric capacity is connected with the drain electrode of described field effect transistor and source electrode respectively.
In one of them embodiment, described pulse-width modulation circuit comprises: drive IC, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance,
The high input voltage pin of described drive IC is connected with the other end of described first inductance by described 5th resistance, described 4th resistance successively;
The oscillator control pin of described drive IC to be connected with the driving fet gate pin of described drive IC by described 8th resistance, described 9th resistance successively and by described 7th resistance with hold and be connected, the driving fet gate pin of described drive IC is connected with the negative pole of described 4th diode;
The current sense feedback pin of described drive IC by described 12 resistance with hold and be connected, the grounding leg of described drive IC is held with ground and is connected, the interior voltage-stabilized power supply voltage pin of described drive IC by described 3rd electric capacity in parallel and described 4th electric capacity with hold and be connected, the interior voltage-stabilized power supply voltage pin of described drive IC also hold with ground by described 6th resistance, described 5th electric capacity in parallel and described 6th electric capacity successively and is connected, the threshold values pin of described drive IC be connected with the pulse-width modulation pin of described drive IC rear pass through described 5th electric capacity with hold and be connected.
In one of them embodiment, described Buck conversion circuit comprises: the 5th diode, the 6th diode, the 3rd polar capacitor and the 3rd inductance,
Described 5th diode and described 6th diode homopolarity are connected in parallel, the negative pole of described 5th diode is connected with the positive pole of the negative pole of described first diode and described 3rd polar capacitor, the described positive pole of the 5th diode is connected with one end of the drain electrode of described field effect transistor and described 3rd inductance, and the other end of described 3rd inductance is connected with the negative pole of described 3rd polar capacitor;
The two ends of described 3rd polar capacitor are connected with described output.
In one of them embodiment, also comprise the second common mode inductance,
In described second common mode inductance, one end of the first coil is connected with the two ends of described 3rd polar capacitor respectively with one end of the second coil in described second common mode inductance;
In described second common mode inductance, the other end of the first coil is connected with described output with the other end of the second coil in described second common mode inductance.
In one of them embodiment, also comprise the 9th electric capacity, the tenth electric capacity, the first piezo-resistance and the second piezo-resistance MOV2,
Described 9th electric capacity is connected with an ac input end of rectifying full bridge described in one and an ac input end of rectifying full bridge described in another respectively, and described tenth electric capacity is connected with another ac input end of rectifying full bridge described in and another ac input end of rectifying full bridge described in another respectively;
Described first piezo-resistance is connected to two ac input ends of rectifying full bridge described in; Described second piezo-resistance is connected between two ac input ends of rectifying full bridge described in another.
In one of them embodiment, also comprise overvoltage crowbar, described overvoltage crowbar comprises: the first voltage stabilizing didoe, the second voltage stabilizing didoe, bidirectional triode thyristor, the 14 resistance, the 15 resistance and the 8th electric capacity,
The anode of described bidirectional triode thyristor is connected with described output with negative electrode, described 8th electric capacity is connected with described 15 resistor coupled in parallel, one end of described 8th electric capacity is connected with the negative electrode of described bidirectional triode thyristor, the other end of described 8th electric capacity is connected with the control pole of described bidirectional triode thyristor by described 14 resistance, the positive pole of described first voltage stabilizing didoe is connected with the negative pole of described second voltage stabilizing didoe, the negative pole of described first voltage stabilizing didoe is connected with the anode of described bidirectional triode thyristor, the positive pole of described second voltage stabilizing didoe is connected with the other end of described 8th electric capacity.
The civil power accessed in the straight tube LED power of above-mentioned compatible inductance, electric ballast passes through rectifier circuit rectifies, filter circuit filtering, circuit of power factor correction improves power factor, the voltage and current of switching circuit, pulse-width modulation circuit and Buck conversion circuit stable output is to LED, prevent the instantaneous pressure exported because of ballast from burning out LED, thus extend the useful life of LED.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the compatible inductance of a preferred embodiment of the present invention, the straight tube LED power of electric ballast;
Fig. 2 is the electrical block diagram of the compatible inductance of the another preferred embodiment of the present invention, the straight tube LED power of electric ballast.
Embodiment
As shown in Figure 1, it is the compatible inductance of a preferred embodiment of the present invention, the structural representation of the straight tube LED power 10 of electric ballast, comprise: the first rectification circuit 210, second rectification circuit 220, filter circuit 300, circuit of power factor correction 400, switching circuit 500, pulse-width modulation circuit 600 and Buck conversion circuit 700, filter circuit 300, circuit of power factor correction 400, switching circuit 500 and Buck conversion circuit 700 connect successively, pulse-width modulation circuit 600 is connected with filter circuit 300 and switching circuit 500 respectively, first rectification circuit 210 is connected with the first incoming end 110 and the second incoming end 120, second rectification circuit 220 is connected with the 3rd incoming end 130 and the 4th incoming end 140, Buck conversion circuit 700 has the first output 810 and the second output 820 for connecting LED load.
First rectification circuit 210 exports direct current signal to filter circuit 300 after carrying out rectification for the AC signal the first incoming end 110 and the second incoming end 120 received, in like manner, the second rectification circuit 220 exports direct current signal to filter circuit 300 after carrying out rectification for the AC signal the 3rd incoming end 130 and the 4th incoming end 140 received.
In actual applications, two ends due to traditional Fluorescent Light and Fixtures are respectively arranged with two and connect electrode, first incoming end 110 and the second incoming end 120 connect electric Electrode connection with two of wherein one end respectively, and the 3rd incoming end 130 and the 4th incoming end 140 connect electric Electrode connection with two of the other end respectively.Selectivity the first incoming end 110 and the second incoming end 120 can be accessed civil power as required, or the 3rd incoming end 130 and the 4th incoming end 140 are accessed civil power.
In the present embodiment, be rectifying full bridge for the first rectification circuit 210 and the second rectification circuit 220 and be described, the first rectification circuit 210 comprises: diode D1, diode D2, diode D3 and diode D4; Second rectification circuit 220 comprises: diode D5, diode D6, diode D7 and diode D8.Two ac input ends of the first rectification circuit 210 are connected with the first incoming end 110 and the second incoming end 120 respectively, two ac input ends of the second rectification circuit 220 are connected with the 3rd incoming end 130 and the 4th incoming end 140 respectively, the direct current positive output end of the first rectification circuit 210 is connected with filter circuit 300 respectively with direct current negative output terminal, and the direct current positive output end of the second rectification circuit 220 is connected with filter circuit 300 respectively with direct current negative output terminal.
Filter circuit 300 for by output smoothing signal after the high frequency waves in direct current signal and clutter filtering to circuit of power factor correction 400 and pulse-width modulation circuit 600.
Filter circuit 300 comprises: the first common mode inductance L1, the first inductance L 2, second inductance L 3, first electric capacity C1, the second electric capacity C2, the 17 resistance R19 and the 18 resistance R20.
In first common mode inductance L1, one end of the first coil 301 is connected with the direct current positive output end of the direct current positive output end of the first rectification circuit 210 and the second rectification circuit 220, and in the first common mode inductance L1, the other end of the first coil 301 is connected with one end of the first inductance L 2.In first common mode inductance L1, one end of the second coil 302 is connected with the direct current negative output terminal of the direct current negative output terminal of the first rectification circuit 210 and the second rectification circuit 220, and in the first common mode inductance L1, the other end of the second coil 302 is connected with one end of the second inductance L 3.First inductance L the 2 and the 17 resistance R19 is connected in parallel, second inductance L the 3 and the 18 resistance R20 is connected in parallel, one end of first inductance L 2 is connected with one end of the second inductance L 3 by the first electric capacity C1, and the other end of the first inductance L 2 is connected with the other end of the second inductance L 3 by the second electric capacity C2.The other end ground connection of the second inductance L 3.The other end of the first inductance L 2 is all connected with circuit of power factor correction 400 with the other end of the second inductance L 3, and the other end of the first inductance L 2 is also connected with pulse-width modulation circuit 600.Wherein, the first common mode inductance L1 plays the effect of filtering high frequency signals, in the design of circuit board, also plays the effect of EMI filtering, for suppressing the electromagnetic wave outside radiation produced.
Circuit of power factor correction 400 for reducing the output calibration signal of telecommunication after the phase difference of voltage in smooth signal and electric current to switching circuit 500.
Circuit of power factor correction 400 comprises: the first diode D9, the second diode D10, the 3rd diode D11, the first polar capacitor C3, the second polar capacitor C4, the first resistance R1 and the second resistance R2.
The positive pole of the first polar capacitor C3 is connected with the other end of the first inductance L 2 and the negative pole of the 3rd diode D11 respectively with negative pole, and the positive pole of the 3rd diode D11 is connected with the other end of the second inductance L 3.The negative pole of the first diode D9 is connected with the other end of the first inductance L 2 and the positive pole of the second polar capacitor C4 respectively with positive pole, and the negative pole of the second polar capacitor C4 is connected with the other end of the second inductance L 3.The positive pole of the second diode D10 is connected with the negative pole of the 3rd diode D11 and the positive pole of the first diode D9 respectively with negative pole.First resistance R1 and the first polar capacitor C3 is connected in parallel, and the second resistance R2 and the second polar capacitor C4 is connected in parallel, and the negative pole of the first diode D9 is connected 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 charges in the mode of series connection, and output current is to switching circuit 500; When the voltage that filter circuit 300 exports is lower than voltage on the first polar capacitor C3 and the second polar capacitor C4, second diode D10 reverse bias, first polar capacitor C3 and the second polar capacitor C4 discharges respectively by the first resistance R1 and the second resistance R2, power factor is improved by the phase difference reducing voltage and electric current in smooth signal, thus improve the active power of LED, realize energy-conservation effect.
Pulse-width modulation circuit 600 for lasting generation pulse signal to switching circuit 500.
Switching circuit 500 for response impulse signal, alternate communication and the connection disconnected between circuit of power factor correction 400 and Buck conversion circuit 700.
Switching circuit 500 comprises: field effect transistor Q1, the 4th diode D14, the 7th electric capacity C8, the 11 electric capacity C13, the 12 electric capacity C14, the tenth resistance R10, the 12 resistance R12, variable resistor RT, the 13 resistance Rx, the 16 resistance R18 and the 19 resistance R21.
The source electrode of field effect transistor Q1 hold with ground by the 13 resistance Rx and is connected, the source electrode of field effect transistor Q1 also pass through successively variable resistor RT, the 12 resistance R12 with hold and be connected, the 7th electric capacity C8 and the 12 resistance R12 is connected in parallel.The negative pole of the 4th diode D14 is connected with the grid of pulse-width modulation circuit 600 and field effect transistor Q1 respectively with positive pole, the grid of field effect transistor Q1 by the 19 resistance R21 with hold and be connected, the tenth resistance R10 and the 4th diode D14 is connected in parallel.The drain electrode of field effect transistor Q1 is connected with the negative pole of the first diode D9 by the 12 electric capacity C14, the 16 resistance R18 successively, and the drain electrode of field effect transistor Q1 is also connected with Buck conversion circuit 700.The two ends of the 11 electric capacity C13 are connected with the drain electrode of field effect transistor Q1 and source electrode respectively.In the present embodiment, the 13 resistance Rx comprises: resistance R13, resistance R14 and resistance R15, and resistance R13, resistance R14 and resistance R15 are connected in parallel.Variable resistor RT two ends are also parallel with the 11 resistance R11.
Pulse-width modulation circuit 600 comprises: drive IC, the 3rd electric capacity C5, the 4th electric capacity C6, the 5th electric capacity C7A, the 6th electric capacity 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.In the present embodiment, drive IC is the integrated circuit of SQ9910 model.
The high input voltage pin Vin of integrated circuit SQ9910 is connected with the other end of the first inductance L 2 by the 5th resistance R5, the 4th resistance R4 successively.The oscillator control pin Rosc of integrated circuit SQ9910 is connected with the driving fet gate pin GATE of integrated circuit SQ9910 by the 8th resistance R8, the 9th resistance R9 successively and pass through the 7th resistance R7 with hold and be connected, the driving fet gate pin GATE of integrated circuit SQ9910 is connected with the negative pole of the 4th diode D14.The current sense feedback pin CS of integrated circuit SQ9910 by the 12 resistance R12 with hold and be connected, the grounding leg GND of integrated circuit SQ9910 holds with ground and is connected, the interior voltage-stabilized power supply voltage pin VDD of integrated circuit SQ9910 by the 3rd electric capacity C5 in parallel and the 4th electric capacity C6 with hold and be connected, the interior voltage-stabilized power supply voltage pin VDD of integrated circuit SQ9910 is also successively by the 6th resistance R6, 5th electric capacity C7A in parallel and the 6th electric capacity C7B hold with ground and are connected, after the threshold values pin LD of integrated circuit SQ9910 is connected with the pulse-width modulation pin PWM_D of integrated circuit SQ9910 by the 5th electric capacity C7A with hold and be connected.In the present embodiment, also comprise the 3rd resistance R3, one end of the 3rd resistance R3 is connected with the positive pole of the first diode D9, and the other end of the 3rd resistance R3 is connected between the 5th resistance R5 and the 4th resistance R4.
The size of the duty ratio of the pulse signal that the driving fet gate pin GATE setting integrated circuit SQ9910 by the 6th resistance R6 exports, controls conducting and the deadline of field effect transistor Q1.In the present embodiment, described pulse signal is square-wave signal.
Buck conversion circuit 700 exports the first output 810 and the second output 820 to after carrying out buck chopper for high-ranking officers' electrical signals.In the present embodiment, the first output 810 is respectively used to the second output 820 both positive and negative polarity being connected external LED lamp.
Buck conversion circuit 700 comprises: the 5th diode D12, the 6th diode D13, the 3rd polar capacitor C9 and the 3rd inductance L x.
5th diode D12 and the 6th diode D13 homopolarity are connected in parallel, the negative pole of the 5th diode D12 is connected with the positive pole of the negative pole of the first diode D9 and the 3rd polar capacitor C9, the positive pole of the 5th diode D12 is connected with one end of the drain electrode of field effect transistor Q1 and the 3rd inductance L x, and the other end of the 3rd inductance L x is connected with the negative pole of the 3rd polar capacitor C9.The two ends of the 3rd polar capacitor C9 are connected with the first output 810 and the second output 820 respectively.Concrete, the 3rd inductance L x comprises: inductance L 4, inductance L 5 and inductance L 6 and inductance L 7, and inductance L 4, inductance L 5, inductance L 6 and inductance L 7 are connected in series, and is connected with the positive pole of the 5th diode D12 and the negative pole of the 3rd polar capacitor C9 respectively.Above-mentioned Buck conversion circuit 700 is also referred to as BUCK circuit.The energy storage during conducting of the 3rd inductance L x scene effect pipe Q1, to LED afterflow when scene effect pipe Q1 ends.Meanwhile, the 3rd inductance L x and the 3rd polar capacitor C9 forms the more stable voltage and current of second-order filter system output to LED.
In the present embodiment, also comprise the second common mode inductance L8.In second common mode inductance L8, one end of the first coil is connected with the two ends of the 3rd polar capacitor C9 respectively with one end of the second coil in the second common mode inductance L8.In second common mode inductance L8, the other end of the first coil is connected with the first output 810 and the second output 820 respectively with the other end of the second coil in the second common mode inductance L8.
In the present embodiment, also comprise the 9th electric capacity C11, the tenth electric capacity C12, the first piezo-resistance MOV1 and the second piezo-resistance MOV2.
9th electric capacity C11 is connected with an ac input end of the first rectification circuit 210 and an ac input end of the second rectification circuit 220 respectively, tenth electric capacity C12 is connected with another ac input end of the first rectification circuit 210 and another ac input end of the second rectification circuit 220 respectively, first piezo-resistance MOV1 is connected between two ac input ends of the first rectification circuit 210, and the second piezo-resistance MOV2 is connected between two ac input ends of the second rectification circuit 220.
For ease of controlling energising and the power-off of LED, in the present embodiment, also comprise the first switch S 1, second switch S2, the 3rd switch S 3 and the 4th switch S 4.First switch S 1 is connected with an ac input end of the first rectification circuit 210 and the first incoming end 110 respectively; Second switch S2 is connected with another ac input end of the first rectification circuit 210 and the second incoming end 120 respectively; 3rd switch S 3 is connected with an ac input end of the second rectification circuit 220 and the 3rd incoming end 130 respectively; 4th switch S 4 is connected with another ac input end of the second rectification circuit 220 and the 4th incoming end 140 respectively.First switch S 1, second switch S2, the 3rd switch S 3 and the 4th switch S 4 can in push-button switch, toggle switch, audio-switch, the light-operated switch such as to open the light any one.
In other embodiment, between an ac input end of the first rectification circuit 210 and the first incoming end 110, be connected with switch, between an ac input end of the second rectification circuit 220 and the 3rd incoming end 130, be connected with switch.
For preventing from flowing into the excessive and components and parts damaged wherein of the electric current of straight tube LED power 10 of compatible inductance, electric ballast, in the present embodiment, also comprise fuse F1, fuse F2 and fuse F3.Fuse F1 is connected between the first incoming end 110 and an ac input end of the first rectification circuit 210; Fuse F2 is connected between the second incoming end 120 and another ac input end of the first rectification circuit 210; Fuse F3 is connected to.In other embodiments, between the first incoming end 110 and an ac input end of the first rectification circuit 210, be connected with fuse, between the 3rd incoming end 130 and an ac input end of the second rectification circuit 220, be connected with fuse.
As shown in Figure 2, it is the electrical block diagram of the compatible inductance of the another preferred embodiment of the present invention, the straight tube LED power 20 of electric ballast.The straight tube LED power 20 of compatible inductance, electric ballast comprises compatible inductance, the straight tube LED power 10 of electric ballast and overvoltage crowbar 900.
Overvoltage crowbar 900 comprises: the first voltage stabilizing didoe ZD2, the second voltage stabilizing didoe ZD3, bidirectional triode thyristor Q3, the 14 resistance R16, the 15 resistance R17 and the 8th electric capacity C10.
The anode of bidirectional triode thyristor Q3 and negative electrode are connected with the positive pole of the 3rd polar capacitor C9 and negative pole respectively, 8th electric capacity C10 and the 15 resistance R17 is connected in parallel, one end of one or eight electric capacity C10 is connected with the negative electrode of bidirectional triode thyristor Q3, the other end of the 8th electric capacity C10 is connected with the control pole of bidirectional triode thyristor Q3 by the 14 resistance R16, the negative pole of the positive pole second voltage stabilizing didoe ZD3 of the first voltage stabilizing didoe ZD2 connects, the negative pole of the first voltage stabilizing didoe ZD2 is connected with the anode of bidirectional triode thyristor Q3, the positive pole of the second voltage stabilizing didoe ZD3 is connected with the other end of the 8th electric capacity C10.
The operation principle of above-mentioned overvoltage crowbar 900 is as follows:
When being carried in the overtension of anode of bidirectional triode thyristor Q3; first voltage stabilizing didoe ZD2 and the second voltage stabilizing didoe ZD3 punctures; and charge to the 8th electric capacity C10; the voltage at the 8th electric capacity C10 two ends raises gradually and makes the current potential of the control pole of bidirectional triode thyristor Q3 reach conducting threshold values; anode and the negative electrode of bidirectional triode thyristor Q3 realize conducting; thus will the both positive and negative polarity short circuit of the LED of the first output 810 and the second output 820 be connected to; prevent from burning out LED because of overtension, play overvoltage protection effect.
The civil power of access in the straight tube LED power 10 of above-mentioned compatible inductance, electric ballast is by the first rectification circuit 210 or the second rectification circuit 220 rectification, filter circuit 300 filtering, circuit of power factor correction 400 improves power factor, the voltage and current of switching circuit 500, pulse-width modulation circuit 600 and Buck conversion circuit 700 stable output is to LED, prevent the instantaneous pressure exported because of ballast from burning out LED, thus extend the useful life of LED.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the straight tube LED power of a compatible inductance, electric ballast, it is characterized in that, comprise: at least one rectification circuit connected successively, filter circuit, circuit of power factor correction, switching circuit, Buck conversion circuit and the pulse-width modulation circuit be connected with described filter circuit and described switching circuit respectively, each described rectification circuit is connected with two incoming ends, and described Buck conversion circuit has the output for connecting LED load;
Described rectification circuit exports direct current signal to described filter circuit after being used for that the AC signal that incoming end described in two receives is carried out rectification;
Described filter circuit is used for output smoothing signal after the high frequency waves in described direct current signal and clutter filtering to described circuit of power factor correction and described pulse-width modulation circuit;
Described circuit of power factor correction is for reducing the extremely described switching circuit of the output calibration signal of telecommunication after the phase difference of voltage and electric current in described smooth signal;
Described pulse-width modulation circuit is used for continuing to produce pulse signal to described switching circuit;
Described switching circuit for responding described pulse signal, alternate communication and the connection disconnected between described circuit of power factor correction and described Buck conversion circuit;
Described Buck conversion circuit exports described output to after being used for that the described correction signal of telecommunication is carried out buck chopper.
2. the straight tube LED power of compatible inductance according to claim 1, electric ballast, is characterized in that, described rectification circuit is two, and described rectification circuit is rectifying full bridge;
Two ac input ends of described rectifying full bridge are connected with two incoming ends respectively, and its direct current positive output end is connected with described filter circuit respectively with direct current negative output terminal.
3. the straight tube LED power of compatible inductance according to claim 1, electric ballast, it is characterized in that, described filter circuit comprises: the first common mode inductance, the first inductance, the second inductance, the first electric capacity, the second electric capacity, the 17 resistance and the 18 resistance
In described first common mode inductance, one end of the first coil and one end of the second coil are all connected with described rectification circuit, and in described first common mode inductance, the other end of the first coil and the other end of the second coil are connected with one end of described first inductance and one end of described second inductance respectively;
Described first inductance is connected with described 17 resistor coupled in parallel, described second inductance is connected with described 18 resistor coupled in parallel, one end of described first inductance is connected with one end of described second inductance by described first electric capacity, and the other end of described first inductance is connected with the other end of described second inductance by described second electric capacity;
The other end of described second inductance is held with ground and is connected;
The other end of described first inductance is all connected with described circuit of power factor correction with the other end of described second inductance, and the other end of described first inductance is also connected with described pulse-width modulation circuit.
4. the straight tube LED power of compatible inductance according to claim 3, electric ballast, it is characterized in that, described circuit of power factor correction comprises: the first diode, the second diode, the 3rd diode, the first polar capacitor, the second polar capacitor, the first resistance and the second resistance
The positive pole of described first polar capacitor is connected with the other end of described first inductance and the negative pole of described 3rd diode respectively with negative pole, and the positive pole of described 3rd diode is connected with the other end of described second inductance;
The negative pole of described first diode is connected with the other end of described first inductance and the positive pole of described second polar capacitor respectively with positive pole, and the negative pole of described second polar capacitor is connected with the other end of described second inductance;
The positive pole of described second diode is connected with the negative pole of described 3rd diode and the positive pole of described first diode respectively with negative pole;
Described first resistance and described first polar capacitor are connected in parallel, and described second resistance and described second polar capacitor are connected in parallel;
The negative pole of described first diode is connected with described switching circuit.
5. the straight tube LED power of compatible inductance according to claim 4, electric ballast, it is characterized in that, described switching circuit comprises: field effect transistor, the 4th diode, the 7th electric capacity, the 11 electric capacity, the 12 electric capacity, the tenth resistance, the 12 resistance, variable resistor, the 13 resistance, the 16 resistance and the 19 resistance
The source electrode of described field effect transistor hold with ground by described 13 resistance and is connected, the source electrode of described field effect transistor also pass through successively described variable resistor, described 12 resistance with hold and be connected, described 7th electric capacity is connected with described 12 resistor coupled in parallel;
The negative pole of described 4th diode is connected with the grid of described pulse-width modulation circuit and described field effect transistor respectively with positive pole, the grid of described field effect transistor by described 19 resistance with hold and be connected, described tenth resistance is connected with described 4th diodes in parallel;
The drain electrode of described field effect transistor is connected with the negative pole of described first diode by described 12 electric capacity, described 16 resistance successively, and the drain electrode of described field effect transistor is also connected with described Buck conversion circuit;
Described 11 electric capacity is connected with the drain electrode of described field effect transistor and source electrode respectively.
6. the straight tube LED power of compatible inductance according to claim 5, electric ballast, it is characterized in that, described pulse-width modulation circuit comprises: drive IC, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and the 9th resistance
The high input voltage pin of described drive IC is connected with the other end of described first inductance by described 5th resistance, described 4th resistance successively;
The oscillator control pin of described drive IC to be connected with the driving fet gate pin of described drive IC by described 8th resistance, described 9th resistance successively and by described 7th resistance with hold and be connected, the driving fet gate pin of described drive IC is connected with the negative pole of described 4th diode;
The current sense feedback pin of described drive IC by described 12 resistance with hold and be connected, the grounding leg of described drive IC is held with ground and is connected, the interior voltage-stabilized power supply voltage pin of described drive IC by described 3rd electric capacity in parallel and described 4th electric capacity with hold and be connected, the interior voltage-stabilized power supply voltage pin of described drive IC also hold with ground by described 6th resistance, described 5th electric capacity in parallel and described 6th electric capacity successively and is connected, the threshold values pin of described drive IC be connected with the pulse-width modulation pin of described drive IC rear pass through described 5th electric capacity with hold and be connected.
7. the straight tube LED power of compatible inductance according to claim 5, electric ballast, is characterized in that, described Buck conversion circuit comprises: the 5th diode, the 6th diode, the 3rd polar capacitor and the 3rd inductance,
Described 5th diode and described 6th diode homopolarity are connected in parallel, the negative pole of described 5th diode is connected with the positive pole of the negative pole of described first diode and described 3rd polar capacitor, the described positive pole of the 5th diode is connected with one end of the drain electrode of described field effect transistor and described 3rd inductance, and the other end of described 3rd inductance is connected with the negative pole of described 3rd polar capacitor;
The two ends of described 3rd polar capacitor are connected with described output.
8. the straight tube LED power of compatible inductance according to claim 7, electric ballast, is characterized in that, also comprises the second common mode inductance,
In described second common mode inductance, one end of the first coil is connected with the two ends of described 3rd polar capacitor respectively with one end of the second coil in described second common mode inductance;
In described second common mode inductance, the other end of the first coil is connected with described output with the other end of the second coil in described second common mode inductance.
9. the straight tube LED power of compatible inductance according to claim 2, electric ballast, is characterized in that, also comprises the 9th electric capacity, the tenth electric capacity, the first piezo-resistance and the second piezo-resistance MOV2,
Described 9th electric capacity is connected with an ac input end of rectifying full bridge described in one and an ac input end of rectifying full bridge described in another respectively, and described tenth electric capacity is connected with another ac input end of rectifying full bridge described in and another ac input end of rectifying full bridge described in another respectively;
Described first piezo-resistance is connected to two ac input ends of rectifying full bridge described in; Described second piezo-resistance is connected between two ac input ends of rectifying full bridge described in another.
10. the straight tube LED power of compatible inductance according to claim 1, electric ballast; it is characterized in that; also comprise overvoltage crowbar; described overvoltage crowbar comprises: the first voltage stabilizing didoe, the second voltage stabilizing didoe, bidirectional triode thyristor, the 14 resistance, the 15 resistance and the 8th electric capacity
The anode of described bidirectional triode thyristor is connected with described output with negative electrode, described 8th electric capacity is connected with described 15 resistor coupled in parallel, one end of described 8th electric capacity is connected with the negative electrode of described bidirectional triode thyristor, the other end of described 8th electric capacity is connected with the control pole of described bidirectional triode thyristor by described 14 resistance, the positive pole of described first voltage stabilizing didoe is connected with the negative pole of described second voltage stabilizing didoe, the negative pole of described first voltage stabilizing didoe is connected with the anode of described bidirectional triode thyristor, the positive pole of described second voltage stabilizing didoe is connected with the other end of described 8th electric capacity.
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Effective date of registration: 20190809 Address after: 516000 No. 72 Huifeng 4th Road, Zhongkai High-tech Zone, Huizhou City, Guangdong Province (Factory Building) Co-patentee after: Huarui photoelectric (Huizhou) Co. Ltd. Patentee after: TCL Huarui Lighting Technology (Huizhou) Co., Ltd. Address before: Three road 516006 in Guangdong province Huizhou City Zhongkai Road No. 26 Patentee before: Huizhou TCL Lighting Appliance Co., Ltd. |