CN205546045U

CN205546045U - Wide input voltage range's of 120 -347VAC LED constant current drive power supply

Info

Publication number: CN205546045U
Application number: CN201620080049.7U
Authority: CN
Inventors: 马生茂; 周焱; 顾赛燕
Original assignee: ZHANGJIAGANG MAIZHI ELECTRONIC SCIENCE & TECHNOLOGY Co Ltd
Current assignee: ZHANGJIAGANG MAIZHI ELECTRONIC SCIENCE & TECHNOLOGY Co Ltd
Priority date: 2016-01-27
Filing date: 2016-01-27
Publication date: 2016-08-31
Anticipated expiration: 2026-01-27

Abstract

The utility model relates to a wide input voltage range's of 120 -347VAC LED constant current drive power supply, including AC input unit, two FLY -BUCK unit, adjustment accuracy of power factor unit, wide voltage start -up unit and output constant current source unit, AC input unit inserts power supply network including the EMC filtering treatment circuit and the bridge type full wave rectification ware that connect gradually, the input of EMC filtering treatment circuit, and bridge type full wave rectification ware output is connected pair FLY -BUCK units, adjustment accuracy of power factor unit and wide voltage and is started the unit, the adjustment accuracy of power factor unit starts the two FLY -BUCK units of unit connection with wide voltage, and two FLY -BUCK units include single -stage PFC control circuit, negative feedback sampling circuit and two FLY -BUCK power conversion circuit, and output constant current source unit is connected to two FLY -BUCK power conversion circuit outputs, and the LED product is connected to output constant current source unit output. This LED constant current drive power supply realizes that the PF value is not less than 0.9, THD value and is not more than 20 index under input gamut, output load are not less than 50% the condition.

Description

A kind of 120-347VAC Wide input voltage range LED Constant-current driving power supply

Technical field

The utility model relates to LED illumination and drives field, particularly relates to the LED constant current driving power supply of the wide scope of a kind of 120-347V AC input, high target.

Background technology

At present LED illumination drive field, the LED drive power of AC input wide-voltage range generally exist input AC high-tension in the case of, value is relatively low for power factor (Power Factor, PF), total harmonic distortion (Total Harmonic Distortion, THD) value is higher, and wide-voltage range is typically 120-277VAC, though portioned product is labeled as 100-305VAC, but it is substantially identical, is all the input voltage taking into account 120VAC, 240VAC, 277VAC these three standard.Generally in the case of input 277VAC, PF value, THD value are poor, especially in the case of actually used 70%, 50% load current of client, are generally unattainable the requirement of Energy Star.Therefore, the utility model provides the LED drive power of a kind of novel AC input wide-voltage range, input voltage range can reach 120-347VAC, the input voltage of 120VAC, 240VAC, 277VAC, 347VAC these four standard can be taken into account, simultaneously can be at input 277VAC, 347VAC, in the case of output loading is not less than 50%, make PF value not less than 0.9, THD value is not more than 20, thus really realizes actually used energy-saving and environment friendly LED illumination System.

Summary of the invention

The utility model is just for technical problem present in existing LED drive power, there is provided a kind of 120-347VAC of input and reality to meet the LED constant current of input voltage fluctuation 10% requirement in this voltage range and drive power supply, realize in the case of input gamut, output loading are not less than 50%, PF value is not less than 0.9, and THD value is not more than the index of 20.

To achieve these goals, the technical solution adopted in the utility model is, the LED constant current of a kind of 120-347VAC wide input voltage range drives power supply, including AC input block, double FLY-BUCK unit, power factor adjustment unit, wide-voltage startup unit and output constant current source unit, wherein

AC input block, for providing Rectified alternating current, circuit and bridge full wave rectifier is processed including the EMC filtering being sequentially connected with, described EMC filtering processes the input of circuit and accesses power supply grid, and described bridge full wave rectifier output connects double FLY-BUCK unit, power factor adjustment unit and wide-voltage startup unit；

Power factor adjustment unit, it is connected with double FLY-BUCK unit, the pulsating direct current signal of telecommunication sent into through AC input block of sampling, it is thus achieved that voltage signal, the current signal that the current sample provided with double FLY-BUCK unit again obtains compares, and completes the Matching and modification of voltage, current waveform；

Double FLY-BUCK unit, including single-stage PFC (PFC) control circuit, negative-feedback sample circuit and double FLY-BUCK circuit for power conversion, described negative-feedback sample circuit is all connected with single-stage PFC control circuit with double FLY-BUCK circuit for power conversion, use the FLY-BUCK circuit for power conversion of two paralleling and interleaving work, it is achieved the energy conversion within the complete period under pwm pattern；

Wide-voltage startup unit, is connected with double FLY-BUCK unit, the pulsating direct current signal of telecommunication sent into through AC input block of sampling, and the pulsating direct current signal of telecommunication is delivered to single-stage PFC control circuit in double FLY-BUCK unit after treatment, it is ensured that the energy supply of control circuit；

Output constant current source unit, its input connects double FLY-BUCK unit, and output connects LED product, it is achieved effective control of output electric current, meets the LED product control requirement to output electric current, reaches the effect of output constant current, light modulation.

As a kind of improvement of the present utility model, the single-stage PFC control circuit of described pair of FLY-BUCK unit uses single-stage PFC control chip NCP1652 as controller, this controller is in addition to containing circuit such as error amplifier, pulse width modulator (PWM), saw-toothed wave generators, also it is integrated with Soft-Skip circuit, high voltage startup circuit, electric voltage feed forward, detection of power loss, input locking, built-in overload timer and high accuracy multiplier, has that integrated level is high, device is few and the feature such as low cost.

nullAs a kind of improvement of the present utility model，Double FLY-BUCK circuit for power conversion of described pair of FLY-BUCK unit include a FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion，The input of a described FLY-BUCK circuit for power conversion connects the OUTA pin of controller NCP1652 by the grid of the first power switch pipe MOSFET，The input of described 2nd FLY-BUCK circuit for power conversion connects the OUTB pin of controller NCP1652 by the grid of the second power switch pipe MOSFET，The output of the oneth FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion is connected to input and the input of output constant current source unit of negative-feedback sample circuit；And set the non-overlapping time delay between OUTA pin and OUTB pin at the Rdelay pin of controller NCP1652 and an indirect resistance of signal ground, thus control a FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion respectively through the first power switch pipe MOSFET and the second power switch pipe MOSFET the two MOSFET opened that interlocks, energy is delivered to output from input.

As a kind of improvement of the present utility model, the output of the bridge full wave rectifier of described AC input block connects the rear class filter circuit being made up of the first inductance and the first electric capacity, the span of described first electric capacity is 0.1 μ F-1.0 μ F, high switching frequency can be reduced, provide low-impedance power for single-stage PFC control circuit.

As a kind of improvement of the present utility model, described power factor adjustment unit includes two the first resistor voltage divider circuits being in parallel and the second resistor voltage divider circuit, first resistor voltage divider circuit connects the AC IN pin of controller NCP1652, bridge full wave rectifier rectification the information of line voltage is input to the multiplier of controller NCP1652 by the sine wave exported by the first resistor voltage divider circuit；Second resistor voltage divider circuit connects the V of controller NCP1652_FFPin, the line voltage through rectifying and wave-filtering is input in controller NCP1652 by the second resistor voltage divider circuit, is used for adjusting controller.

As a kind of improvement of the present utility model, described wide-voltage startup unit includes the direct current start-up circuit of controller NCP1652 and starts voltage V_CCProduce circuit, described direct current start-up circuit includes Schottky diode, the first commutation diode, the first current limliting divider resistance and the second electric capacity, the anode of Schottky diode and the positive pole of the first commutation diode are connected, the negative pole of the first commutation diode connects and accesses signal ground after the second electric capacity, and the negative pole of the first commutation diode is connected and is connected with the HV pin of controller NCP1652 after the first current limliting divider resistance；Described startup voltage V_CCProduce circuit and include the second commutation diode, the 3rd commutation diode, the second current limliting divider resistance, the 3rd electric capacity, the 4th electric capacity and coupling inductor, the positive pole of the second commutation diode is connected with coupling inductor, the negative pole of the second commutation diode connects the positive pole of the 3rd commutation diode, and the negative pole of the 3rd commutation diode is connected and is connected with the Vcc pin of controller NCP1652 after the second current limliting divider resistance；One end of 3rd electric capacity is connected between the negative pole of the second commutation diode and the positive pole of the 3rd commutation diode, and another terminates signal ground；One end of 4th electric capacity is connected between the second current limliting divider resistance and Vcc pin, and another terminates signal ground.

As a kind of improvement of the present utility model, described EMC filtering processes circuit and includes fuse, coupling inductance, resistor, 5th electric capacity, second inductance, 6th electric capacity, 7th electric capacity and the 8th electric capacity, on the live wire of fuse incoming transport electrical network, the Same Name of Ends of coupling inductance connects zero line and the live wire of AC network respectively, different name end parallel connection in coupling inductance accesses resistor, at the two ends of resistor, parallel connection accesses the 5th electric capacity and the 6th electric capacity successively, it is serially connected with the second inductance between the 5th electric capacity and the 6th electric capacity, 7th capacitances in series is between zero line and zero connection protection line, 8th capacitance series is between zero connection protection line and the second inductance.

As a kind of improvement of the present utility model, described first resistor voltage divider circuit includes the first resistance, the second resistance, the 3rd resistance and the 4th resistance being sequentially connected in series, it is parallel with the 9th electric capacity at the 4th resistance two ends, the end of the 4th resistance accesses signal ground, draws the AC IN pin that one article of branch road connects controller NCP1652 between the 3rd resistance and the 4th resistance；Described second resistor voltage divider circuit includes the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance being sequentially connected in series, it is parallel with the 9th resistance and the tenth electric capacity at the two ends of the 8th resistance, the end of the 8th resistance accesses signal ground, draws the V that one article of branch road connects controller NCP1652 between the 7th resistance and the 8th resistance_FFPin.

nullAs a kind of improvement of the present utility model，A described FLY-BUCK circuit for power conversion includes the first transformer、First diode、Tenth resistance、11st electric capacity、First output commutation diode and the first output capacitance，The positive pole of the first diode and the former limit Same Name of Ends of the first transformer connect the drain electrode of the first power switch pipe MOSFET，After tenth resistance and the 11st electric capacity are in parallel, one end is connected with the negative pole of the first diode，The other end connects the former limit different name end of the first transformer，The secondary Same Name of Ends of the first transformer connects the positive pole of the first output commutation diode，The negative pole of the first output commutation diode connects the positive pole of the first output capacitance，The negative pole of the first output capacitance and the secondary different name end of the first transformer access simulation ground after being connected，The branch road the first output as double FLY-BUCK unit is drawn between negative pole and the positive pole of the first output capacitance of the first output commutation diode；Described 2nd FLY-BUCK circuit for power conversion includes the second transformer, second diode, 11st resistance, 12nd electric capacity and the second output commutation diode, the positive pole of the second diode and the former limit Same Name of Ends of the second transformer connect the drain electrode of the second power switch pipe MOSFET, after 11st resistance and the 12nd electric capacity are in parallel, one end is connected with the negative pole of the second diode, the other end connects the former limit different name end of the second transformer, the secondary Same Name of Ends of the second transformer connects the positive pole of the second output commutation diode, the secondary different name of the second transformer terminates into simulation ground, the negative pole of the second output commutation diode draws the second output as double FLY-BUCK unit；The former limit different name end of the first transformer and the second transformer is connected with the rear class filter circuit output of AC input block, and the source electrode of the first power switch pipe MOSFET and the second power switch pipe MOSFET is connected and is then connected to the rear class filter circuit output of AC input block after the 12nd resistance of connecting；Described negative-feedback sample circuit includes current/voltage testing circuit and the photoisolator being sequentially connected, on the one hand first output of double FLY-BUCK unit and the second output connect current/voltage testing circuit, on the other hand output constant current source unit is connected, the doubleway output end of photoisolator lead up to the 13rd resistance connect controller NCP1652 FB pin, another road is connected with the rear class filter circuit output of AC input block.

As a kind of improvement of the present utility model, the external timing capacitor of CT pin of described controller NCP1652 produces the sawtooth waveforms of a 0.2V-0.4V and sets the frequency of oscillator and the gain of multiplier, RAMP COMP pin regulates, with an indirect resistance of signal ground, the slope compensation amount being added on current signal, prevents harmonic vibration；FB pin connects an external error amplifier circuit, described external error amplifier circuit includes triode, the 14th resistance, the 13rd electric capacity and the 14th electric capacity, one end of 14th resistance connects FB pin, the base stage of other end connecting triode, one end of 13rd electric capacity connects FB pin, the colelctor electrode of other end connecting triode, the 14th electric capacity is connected between the base stage of triode and emitter stage, and the emitter stage of triode accesses signal ground；The output of internal multiplier is filtered by CM pin with an indirect electric capacity of signal ground, it is sequentially connected in series a resistance and electric capacity between AC COMP pin and signal ground and sets limit as AC reference amplifier, signal ground is accessed after one resistance of Latch pin serial connection, signal ground, I is accessed after one resistance of Rdelay pin serial connection_AVGAn external resistance and an electric capacity between pin and signal ground, this resistance and electric capacity is connected in parallel, I_SPOSAn external resistance and an electric capacity between pin and signal ground, this resistance and electric capacity are connected in parallel, and I_SPOSThe first power switch pipe MOSFET and the source electrode of the second power switch pipe MOSFET is connected after pin serial connection the 15th resistance, the 16th resistance and the 17th resistance is concatenated between OUTA pin and signal ground, and between the 16th resistance and the 17th resistance, draw the grid that one article of branch road connects the first power switch pipe MOSFET, the 18th resistance and the 19th resistance is concatenated between OUTB pin and signal ground, and between the 18th resistance and the 19th resistance, draw the grid that one article of branch road connects the second power switch pipe MOSFET, GND pin accesses signal ground, it is connected by coupling electric capacity between signal ground with simulation ground.

Relative to prior art, advantage of the present utility model is as follows, 1) this LED constant current drives the simple in construction of power supply, input voltage range wider, PF value can be kept under nominal input condition more than 0.9, THD value is less than 0.2, in 120-347V AC input gamut, meet the requirement of Energy Star, be that the LED of a kind of low cost high target drives solution；2) double FLY-BUCK unit is used can fundamentally to avoid the defect that PF value existing when causing inputting AC voltage height because input AC voltage range is the widest and THD value decline simultaneously, the FLY-BUCK circuit for power conversion of two paralleling and interleaving work is used in double FLY-BUCK unit, realize the energy conversion within the complete period under pwm pattern, under identical initial conditions, improve input current sample amplitude, for improving PF value, reduce THD value and provide condition, simultaneously because use the FLU-BUCK circuit for power conversion of two paralleling and interleaving work, significantly reduce the DC ripple electric current after conversion, improve the duty of rear class output constant current source unit；3) for input AC voltage range width, the situation that input voltage is high, and for reaching high PF value, power factor adjustment unit is sampled through the pulsating direct current signal of telecommunication of AC input block feeding, it is thus achieved that voltage signal, then the current signal that the current sample provided with double FLY-BUCK unit obtains compares, complete the Matching and modification of voltage, current waveform, to obtain high PF value, in the case of AC input gamut voltage, output loading are not less than 50%, PF value is not less than 0.9；4) wide-voltage startup unit is for input AC voltage range width, solve control circuit power pack, and solve high voltage startup, continued power problem and propose, thus solve the AC input input low-voltage that causes of Width funtion and startup voltage that high voltage causes takes into account problem, during providing product normally to work, control the energy supply of part simultaneously；5) AC input block includes that the EMC filtering being sequentially connected with processes circuit, bridge full wave rectifier and rear class filter circuit, EMC filtering processes circuit and solves Conduction Interference problem, bridge full wave rectifier completes AC input and turns the function of Rectified alternating current, rear class filter circuit carries out High frequency filter to the pulsating direct current signal of telecommunication further, a low-impedance power is provided for double FLY-BUCK unit, the design using NCP1652 controller to carry out single-stage PFC control circuit has low cost, simple in construction, operating efficiency advantages of higher, simultaneously, inherent defect for single-stage PFC is improved, accelerate loop response, reduce electromagnetic interference signal, reduce noise, reduce input industrial frequency harmonic.

Accompanying drawing explanation

Fig. 1 is schematic block circuit diagram of the present utility model.

Fig. 2 is circuit theory diagrams of the present utility model.

Detailed description of the invention

In order to deepen understanding and cognition of the present utility model, below in conjunction with the accompanying drawings the utility model it is further described and introduce.

As depicted in figs. 1 and 2, the LED constant current of a kind of 120-347VAC wide input voltage range drives power supply, including AC input block, double FLY-BUCK unit, power factor adjustment unit, wide-voltage startup unit and output constant current source unit.Wherein,

AC input block, for providing Rectified alternating current, circuit and bridge full wave rectifier is processed including the EMC filtering being sequentially connected with, described EMC filtering processes the input of circuit and accesses power supply grid, and described bridge full wave rectifier output connects double FLY-BUCK unit, power factor adjustment unit and wide-voltage startup unit.

Power factor adjustment unit, it is connected with double FLY-BUCK unit, the pulsating direct current signal of telecommunication sent into through AC input block of sampling, it is thus achieved that voltage signal, the current signal that the current sample provided with double FLY-BUCK unit again obtains compares, and completes the Matching and modification of voltage, current waveform.

Double FLY-BUCK unit, including single-stage PFC (PFC) control circuit, negative-feedback sample circuit and double FLY-BUCK circuit for power conversion, described negative-feedback sample circuit is all connected with single-stage PFC control circuit with double FLY-BUCK circuit for power conversion, use the FLY-BUCK circuit for power conversion of two paralleling and interleaving work, it is achieved the energy conversion within the complete period under pwm pattern.

Wide-voltage startup unit, is connected with double FLY-BUCK unit, the pulsating direct current signal of telecommunication sent into through AC input block of sampling, and the pulsating direct current signal of telecommunication is delivered to single-stage PFC control circuit in double FLY-BUCK unit after treatment, it is ensured that the energy supply of control circuit.

The output of the bridge full wave rectifier BR2 of described AC input block connects the rear class filter circuit being made up of the first inductance L7 and the first electric capacity C38, the span of described first electric capacity C38 is 0.1 μ F-1.0 μ F, high switching frequency can be reduced, provide low-impedance power for single-stage PFC control circuit.EMC filtering processes circuit and includes fuse F2, coupling inductance L5, resistor RP2, 5th electric capacity C36, second inductance L6, 6th electric capacity C37, 7th electric capacity C19 and the 8th electric capacity C21, on the live wire L4 of fuse F2 incoming transport electrical network, the Same Name of Ends of coupling inductance L5 connects the zero line N1 and live wire L4 of AC network respectively, different name end parallel connection in coupling inductance L5 accesses resistor RP2, at the two ends of resistor RP2, parallel connection accesses the 5th electric capacity C36 and the 6th electric capacity C37 successively, it is serially connected with the second inductance L6 between the 5th electric capacity C36 and the 6th electric capacity C37, 7th electric capacity C19 is connected between zero line N1 and zero connection protection line CASE1, 8th electric capacity C21 is serially connected between zero connection protection line CASE1 and the second inductance L6.

The single-stage PFC control circuit of described pair of FLY-BUCK unit uses single-stage PFC control chip NCP1652 as controller.Double FLY-BUCK circuit for power conversion include a FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion, the input of a described FLY-BUCK circuit for power conversion connects the OUTA pin P13 of controller NCP1652 by the grid of the first power switch pipe MOSFET D15, the input of described 2nd FLY-BUCK circuit for power conversion connects the OUTB pin P14 of controller NCP1652 by the grid of the second power switch pipe MOSFET D16, the output of the oneth FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion is connected to input and the input of output constant current source unit of negative-feedback sample circuit；And set the non-overlapping time delay between OUTA pin P13 and OUTB pin P14 at the Rdelay pin P9 of controller NCP1652 and an indirect resistance of signal ground, thus control a FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion respectively through the first power switch pipe MOSFET D15 and the second power switch pipe MOSFET D16 the two MOSFET opened that interlocks, energy is delivered to output from input.

nullA described FLY-BUCK circuit for power conversion includes the first transformer T2、First diode D8、Tenth resistance R33、11st electric capacity C25、First output commutation diode D13 and the first output capacitance C28，The positive pole of the first diode D8 and the former limit Same Name of Ends of the first transformer T2 connect the drain electrode of the first power switch pipe MOSFET D15，After tenth resistance R33 and the 11st electric capacity C25 is in parallel, one end is connected with the negative pole of the first diode D8，The other end connects the former limit different name end of the first transformer T2，The secondary Same Name of Ends of the first transformer T2 connects the positive pole of the first output commutation diode D13，The negative pole of the first output commutation diode D13 connects the positive pole of the first output capacitance C28，The negative pole of the first output capacitance C28 and the secondary different name end of the first transformer T2 access simulation ground after being connected，The branch road the first output as double FLY-BUCK unit is drawn between negative pole and the positive pole of the first output capacitance C28 of the first output commutation diode D13；nullDescribed 2nd FLY-BUCK circuit for power conversion includes the second transformer T3、Second diode D11、11st resistance R34、12nd electric capacity C27 and second output commutation diode D14，The positive pole of the second diode D11 and the former limit Same Name of Ends of the second transformer T3 connect the drain electrode of the second power switch pipe MOSFET D16，After 11st resistance R34 and the 12nd electric capacity C27 is in parallel, one end is connected with the negative pole of the second diode D11，The other end connects the former limit different name end of the second transformer T3，The secondary Same Name of Ends of the second transformer T3 connects the positive pole of the second output commutation diode D14，The secondary different name of the second transformer T3 terminates into simulation ground，The negative pole of the second output commutation diode D14 draws the second output as double FLY-BUCK unit；The former limit different name end of the first transformer T2 and the second transformer T3 is connected with the rear class filter circuit output of AC input block, and the source electrode of the first power switch pipe MOSFET D15 and the second power switch pipe MOSFET D16 is connected and is then connected to the rear class filter circuit output of AC input block after the 12nd resistance R50 that connects；Described negative-feedback sample circuit includes current/voltage testing circuit and the photoisolator being sequentially connected, on the one hand first output of double FLY-BUCK unit and the second output connect current/voltage testing circuit, on the other hand output constant current source unit is connected, the doubleway output end of photoisolator lead up to the 13rd resistance connect controller NCP1652 FB pin P4, another road is connected with the rear class filter circuit output of AC input block.

Described power factor adjustment unit includes two the first resistor voltage divider circuits being in parallel and the second resistor voltage divider circuit, first resistor voltage divider circuit connects the AC IN pin P3 of controller NCP1652, bridge full wave rectifier rectification the information of line voltage is input to the multiplier of controller NCP1652 by the sine wave exported by the first resistor voltage divider circuit；Second resistor voltage divider circuit connects the V of controller NCP1652_FFPin P5, the line voltage through rectifying and wave-filtering is input in controller NCP1652 by the second resistor voltage divider circuit, is used for adjusting controller.

Described first resistor voltage divider circuit includes the first resistance R11, the second resistance R13, the 3rd resistance R14 and the 4th resistance R35 being sequentially connected in series, it is parallel with the 9th electric capacity C39 at the 4th resistance R35 two ends, the end of the 4th resistance R35 accesses signal ground, draws the AC IN pin P3 that one article of branch road connects controller NCP1652 between the 3rd resistance R14 and the 4th resistance R35；Described second resistor voltage divider circuit includes the 5th resistance R12, the 6th resistance R15, the 7th resistance R26 and the 8th resistance R36 being sequentially connected in series, it is parallel with the 9th resistance R37 and the tenth electric capacity C40 at the two ends of the 8th resistance R36, the end of the 8th resistance R36 accesses signal ground, draws the V that one article of branch road connects controller NCP1652 between the 7th resistance R26 and the 8th resistance R36_FFPin P5.

Described wide-voltage startup unit includes the direct current start-up circuit of controller NCP1652 and starts voltage V_CCProduce circuit, described direct current start-up circuit includes Schottky diode D4, the first commutation diode D6, the first current limliting divider resistance R43 and the second electric capacity C23, the anode of Schottky diode D4 and the positive pole of the first commutation diode D6 are connected, the negative pole of the first commutation diode D6 connects and accesses signal ground after the second electric capacity C23, and the negative pole of the first commutation diode D6 is connected and is connected with the HV pin P16 of controller NCP1652 after the first current limliting divider resistance R43；Described startup voltage V_CCProduce circuit and include the second commutation diode D7, the 3rd commutation diode D12, the second current limliting divider resistance R27, the 3rd electric capacity C47, the 4th electric capacity C24 and coupling inductor, the positive pole of the second commutation diode D7 is connected with coupling inductor, the negative pole of the second commutation diode D7 connects the positive pole of the 3rd commutation diode D12, and the negative pole of the 3rd commutation diode D12 is connected and is connected with the Vcc pin P12 of controller NCP1652 after the second current limliting divider resistance R27；One end of 3rd electric capacity C47 is connected between negative pole and the positive pole of the 3rd commutation diode D12 of the second commutation diode D7, and another terminates signal ground；One end of 4th electric capacity C24 is connected between the second current limliting divider resistance R27 and Vcc pin P12, and another terminates signal ground.

CT external timing capacitor C45 of pin P1 of described controller NCP1652 produces the sawtooth waveforms of a 0.2V-0.4V and sets the frequency of oscillator and the gain of multiplier, RAMP COMP pin P2 regulates, with an indirect resistance R41 of signal ground, the slope compensation amount being added on current signal, prevents harmonic vibration；FB pin P4 connects an external error amplifier circuit, described external error amplifier circuit includes triode Q1, the 14th resistance R52, the 13rd electric capacity C49 and the 14th electric capacity C43, one end of 14th resistance R52 connects FB pin P4, the base stage of other end connecting triode Q1, one end of 13rd electric capacity C49 connects FB pin P4, the colelctor electrode of other end connecting triode Q1,14th electric capacity C43 is connected between base stage and the emitter stage of triode Q1, and the emitter stage of triode Q1 accesses signal ground；The output of internal multiplier is filtered by CM pin P6 with an indirect electric capacity C41 of signal ground, it is sequentially connected in series a resistance R38 and electric capacity C42 between AC COMP pin P7 and signal ground and sets limit as AC reference amplifier, signal ground is accessed after Latch pin P8 one resistance R40 of series connection, signal ground, I is accessed after Rdelay pin P9 one resistance R42 of series connection_AVGBetween pin P10 and signal ground, an external resistance R47 and an electric capacity C46, this resistance R47 and electric capacity C46 are connected in parallel, I_SPOSBetween pin P11 and signal ground, an external resistance R49 and an electric capacity C48, this resistance R49 and electric capacity C48 are connected in parallel, and I_SPOSnullThe first power switch pipe MOSFET D15 and the source electrode of the second power switch pipe MOSFET D16 is connected after pin P11 series connection the 15th resistance R30，The 16th resistance R48 and the 17th resistance R44 is concatenated between OUTA pin P13 and signal ground，And between the 16th resistance R48 and the 17th resistance R44, draw the grid that one article of branch road connects the first power switch pipe MOSFET D15，The 18th resistance R51 and the 19th resistance R45 is concatenated between OUTB pin P14 and signal ground，And between the 18th resistance R51 and the 19th resistance R45, draw the grid that one article of branch road connects the second power switch pipe MOSFET D16，GND pin P15 accesses signal ground，It is connected by coupling electric capacity C22 between signal ground with simulation ground.

AC input block: AC input filters protection, then the rectification through BR2 through the prime of F2, L5, RP2, C36, L6, C37, C19, C21, through the rear class filtering of L7, C38, it is provided that to rear class Rectified alternating current.

Power factor adjustment unit: the Rectified alternating current that prime AC input block provides, at this element, through R11, R13, R14 and R35, C39, it is provided that to control chip NCP1652 mono-road AC voltage signal；Through R12, R15, R26 and R36, C40, it is provided that to control chip NCP1652 mono-road AC voltage signal；Here the AC voltage signal sampled, enters control chip, becomes the benchmark AC voltage signal adjusting control system；Current signal is sampled through R50, R30, R49, R48, sends into control chip, becomes the reference current signal of control system；Here sampled current signals be by D15, D16 the two interlock work MOSFET provide, current sample is achieved within the complete period of system work, optimize sampled current signals, provide the foundation for power factor adjustment unit steady operation in the case of high input voltage, time to ensure that input AC is high-tension, PF value not less than 0.9, THD value no more than 20.Really realize the environmental protection that client uses.

Wide-voltage startup unit: the Rectified alternating current that prime AC input block provides, at this element, through the step-down process of D4, it is ensured that the ceiling voltage to control chip is less than and requires；It is rectified into direct current through D6；C23 energy storage, after R43 current limliting dividing potential drop, sends into control chip NCP1652, and bootrom works, and completes the work of starting stage control system；After control system initialization, through D7, D12 rectification, R27 current limliting dividing potential drop, C47, C24 energy storage, control chip enters normal operating conditions.

Double FLY-BUCK unit: be one and realize being converted to determine D/C voltage by wide for input AC voltage, complete the preliminary energy conversion of product；Simultaneously because use FLY-BUCK conversion plan, decreasing due to input AC voltage range width to greatest extent, the pulse width variation under the high AC input condition caused is big, and the high-end PF value, the change of THD value that cause are too fast；Simultaneously because use double FLY-BUCK pattern, optimize high-end PF value, THD value further.The Rectified alternating current that prime AC input block provides, at this element, interlock the MOSFET opened through D15, D16 the two, control T2, T3 respectively, energy is delivered to output from input, D15, D16 service time of input can not be the most open-minded within a cycle and it is necessary to ensures there is reliable time interval between two MOSFET service times, to prevent inefficacy damage product；Owing to D15, D16 keep the service time of relatively big space rate within a work period of control system, effective solution current sample single peak is the highest, the least problem caused of dutycycle, the current signal sampled is easier to and voltage sampling signal carries out coupling regulation, thus brings higher PF value, lower THD value；Simultaneously because use, double MOSFET is staggered opens transmission energy, the energy ezpenditure that FLY-BUCK transmission energy during bring is greatly reduced, thus improves product efficiency；It is in continuous state owing to exporting electric current during working in whole control system, output filter capacitor value can be greatly reduced, under extreme case, even can cancel output filter capacitor；Owing to input current is also at continuous state, the filter inductance of AC input block can be greatly reduced inductance value, it is also possible to meets EMC Requirements.In this element, U5, U6 in negative-feedback sample circuit is that output carries out degenerative core devices to input control system, to ensure stablizing of output end voltage, current sample part is simultaneously fed into control system, is controlled with the power output transmitting energy.

Output constant current source unit, in the utility model example, generally uses constant-current source control chip to add peripheral circuit, such as LM3409 etc.；Digital circuit can also be used to carry out collocation process, to realize effective control of output electric current, meet product to the control of output electric current, adjust requirement, reach the effect of output constant current, light modulation.

In sum, the utility model discloses the input of a kind of AC Width funtion, adapts to the product of multiple types voltage, it is effectively increased the PF value of product simultaneously, reduces THD value, reduce output filter capacitor, the low cost of input filter inductance, high target, high reliability product.Use the circuit-mode of bipolar parallel connection in the product, have the advantage that output current fluctuation is little, output filter capacitor can be greatly decreased, for less demanding product, output capacitance in circuit for power conversion can be saved, and this is the unexistent function of existing LED drive power, but also THD value can be greatly reduced, improving PF value, the EMC reducing input processes circuit components (ensuring compliance with FCC15 CLASS2 nominally)；This is the new mode that a kind of circuit variation is brought, and actual test effect is fine.

It should be noted that above-described embodiment, be not used for limiting protection domain of the present utility model, equivalents done on the basis of technique scheme or replacement each fall within the utility model scope of the claimed protection.In the claims, word " comprises " and does not excludes the presence of the element not arranged in the claims.Word first, second and third use do not indicate that any order, can be title by these word explanations.

Claims

1. the LED constant current of a 120-347VAC wide input voltage range drives power supply, it is characterized in that: include AC input block, double FLY-BUCK unit, power factor adjustment unit, wide-voltage startup unit and output constant current source unit, wherein, AC input block includes that the EMC filtering being sequentially connected with processes circuit and bridge full wave rectifier, described EMC filtering processes the input of circuit and accesses power supply grid, and described bridge full wave rectifier output connects double FLY-BUCK unit, power factor adjustment unit and wide-voltage startup unit；The output of power factor adjustment unit is connected with double FLY-BUCK unit, double FLY-BUCK unit include single-stage PFC control circuit, negative-feedback sample circuit and double FLY-BUCK circuit for power conversion, described negative-feedback sample circuit is all connected with single-stage PFC control circuit with double FLY-BUCK circuit for power conversion, the output of wide-voltage startup unit is connected with double FLY-BUCK unit, the input of output constant current source unit connects double FLY-BUCK unit, and the output of output constant current source unit connects LED product.

The LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 1 drives power supply, it is characterised in that the single-stage PFC control circuit of described pair of FLY-BUCK unit uses single-stage PFC control chip NCP1652 as controller.

nullThe LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 2 drives power supply，It is characterized in that，Double FLY-BUCK circuit for power conversion of described pair of FLY-BUCK unit include a FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion，The input of a described FLY-BUCK circuit for power conversion connects the OUTA pin of controller NCP1652 by the grid of the first power switch pipe MOSFET，The input of described 2nd FLY-BUCK circuit for power conversion connects the OUTB pin of controller NCP1652 by the grid of the second power switch pipe MOSFET，The output of the oneth FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion is connected to input and the input of output constant current source unit of negative-feedback sample circuit；And set the non-overlapping time delay between OUTA pin and OUTB pin at the Rdelay pin of controller NCP1652 and an indirect resistance of signal ground, thus control a FLY-BUCK circuit for power conversion and the 2nd FLY-BUCK circuit for power conversion respectively through the first power switch pipe MOSFET and the second power switch pipe MOSFET the two MOSFET opened that interlocks, energy is delivered to output from input.

The LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 1 drives power supply, it is characterised in that the output of the bridge full wave rectifier of described AC input block connects the rear class filter circuit being made up of the first inductance and the first electric capacity.

The LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 2 drives power supply, it is characterized in that, described power factor adjustment unit includes two the first resistor voltage divider circuits being in parallel and the second resistor voltage divider circuit, first resistor voltage divider circuit connects the AC IN pin of controller NCP1652, bridge full wave rectifier rectification the information of line voltage is input to the multiplier of controller NCP1652 by the sine wave exported by the first resistor voltage divider circuit；Second resistor voltage divider circuit connects the V of controller NCP1652_FFPin, the line voltage through rectifying and wave-filtering is input in controller NCP1652 by the second resistor voltage divider circuit.

The LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 2 drives power supply, it is characterised in that described wide-voltage startup unit includes the direct current start-up circuit of controller NCP1652 and starts voltage V_CCProduce circuit, described direct current start-up circuit includes Schottky diode, the first commutation diode, the first current limliting divider resistance and the second electric capacity, the anode of Schottky diode and the positive pole of the first commutation diode are connected, the negative pole of the first commutation diode connects and accesses signal ground after the second electric capacity, and the negative pole of the first commutation diode is connected and is connected with the HV pin of controller NCP1652 after the first current limliting divider resistance；Described startup voltage V_CCProduce circuit and include the second commutation diode, the 3rd commutation diode, the second current limliting divider resistance, the 3rd electric capacity, the 4th electric capacity and coupling inductor, the positive pole of the second commutation diode is connected with coupling inductor, the negative pole of the second commutation diode connects the positive pole of the 3rd commutation diode, and the negative pole of the 3rd commutation diode is connected and is connected with the Vcc pin of controller NCP1652 after the second current limliting divider resistance；One end of 3rd electric capacity is connected between the negative pole of the second commutation diode and the positive pole of the 3rd commutation diode, and another terminates signal ground；One end of 4th electric capacity is connected between the second current limliting divider resistance and Vcc pin, and another terminates signal ground.

The LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 1 drives power supply, it is characterized in that, described EMC filtering processes circuit and includes fuse, coupling inductance, resistor, 5th electric capacity, second inductance, 6th electric capacity, 7th electric capacity and the 8th electric capacity, on the live wire of fuse incoming transport electrical network, the Same Name of Ends of coupling inductance connects zero line and the live wire of AC network respectively, different name end parallel connection in coupling inductance accesses resistor, at the two ends of resistor, parallel connection accesses the 5th electric capacity and the 6th electric capacity successively, it is serially connected with the second inductance between the 5th electric capacity and the 6th electric capacity, 7th capacitances in series is between zero line and zero connection protection line, 8th capacitance series is between zero connection protection line and the second inductance.

The LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 5 drives power supply, it is characterized in that, described first resistor voltage divider circuit includes the first resistance, the second resistance, the 3rd resistance and the 4th resistance being sequentially connected in series, it is parallel with the 9th electric capacity at the 4th resistance two ends, the end of the 4th resistance accesses signal ground, draws the AC IN pin that one article of branch road connects controller NCP1652 between the 3rd resistance and the 4th resistance；Described second resistor voltage divider circuit includes the 5th resistance, the 6th resistance, the 7th resistance and the 8th resistance being sequentially connected in series, it is parallel with the 9th resistance and the tenth electric capacity at the two ends of the 8th resistance, the end of the 8th resistance accesses signal ground, draws the V that one article of branch road connects controller NCP1652 between the 7th resistance and the 8th resistance_FFPin.

nullThe LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 3 drives power supply，It is characterized in that，A described FLY-BUCK circuit for power conversion includes the first transformer、First diode、Tenth resistance、11st electric capacity、First output commutation diode and the first output capacitance，The positive pole of the first diode and the former limit Same Name of Ends of the first transformer connect the drain electrode of the first power switch pipe MOSFET，After tenth resistance and the 11st electric capacity are in parallel, one end is connected with the negative pole of the first diode，The other end connects the former limit different name end of the first transformer，The secondary Same Name of Ends of the first transformer connects the positive pole of the first output commutation diode，The negative pole of the first output commutation diode connects the positive pole of the first output capacitance，The negative pole of the first output capacitance and the secondary different name end of the first transformer access simulation ground after being connected，The branch road the first output as double FLY-BUCK unit is drawn between negative pole and the positive pole of the first output capacitance of the first output commutation diode；Described 2nd FLY-BUCK circuit for power conversion includes the second transformer, second diode, 11st resistance, 12nd electric capacity and the second output commutation diode, the positive pole of the second diode and the former limit Same Name of Ends of the second transformer connect the drain electrode of the second power switch pipe MOSFET, after 11st resistance and the 12nd electric capacity are in parallel, one end is connected with the negative pole of the second diode, the other end connects the former limit different name end of the second transformer, the secondary Same Name of Ends of the second transformer connects the positive pole of the second output commutation diode, the secondary different name of the second transformer terminates into simulation ground, the negative pole of the second output commutation diode draws the second output as double FLY-BUCK unit；The former limit different name end of the first transformer and the second transformer is connected with the rear class filter circuit output of AC input block, and the source electrode of the first power switch pipe MOSFET and the second power switch pipe MOSFET is connected and is then connected to the rear class filter circuit output of AC input block after the 12nd resistance of connecting；Described negative-feedback sample circuit includes current/voltage testing circuit and the photoisolator being sequentially connected, on the one hand first output of double FLY-BUCK unit and the second output connect current/voltage testing circuit, on the other hand output constant current source unit is connected, the doubleway output end of photoisolator lead up to the 13rd resistance connect controller NCP1652 FB pin, another road is connected with the rear class filter circuit output of AC input block.

The LED constant current of a kind of 120-347VAC wide input voltage range the most as claimed in claim 2 drives power supply, it is characterized in that, the external timing capacitor of CT pin of described controller NCP1652 produces the sawtooth waveforms of a 0.2V-0.4V and sets the frequency of oscillator and the gain of multiplier, RAMP COMP pin regulates, with an indirect resistance of signal ground, the slope compensation amount being added on current signal, prevents harmonic vibration；FB pin connects an external error amplifier circuit, described external error amplifier circuit includes triode, the 14th resistance, the 13rd electric capacity and the 14th electric capacity, one end of 14th resistance connects FB pin, the base stage of other end connecting triode, one end of 13rd electric capacity connects FB pin, the colelctor electrode of other end connecting triode, the 14th electric capacity is connected between the base stage of triode and emitter stage, and the emitter stage of triode accesses signal ground；The output of internal multiplier is filtered by CM pin with an indirect electric capacity of signal ground, it is sequentially connected in series a resistance and electric capacity between AC COMP pin and signal ground and sets limit as AC reference amplifier, signal ground is accessed after one resistance of Latch pin serial connection, signal ground, I is accessed after one resistance of Rdelay pin serial connection_AVGAn external resistance and an electric capacity between pin and signal ground, this resistance and electric capacity is connected in parallel, I_SPOSAn external resistance and an electric capacity between pin and signal ground, this resistance and electric capacity are connected in parallel, and I_SPOSThe first power switch pipe MOSFET and the source electrode of the second power switch pipe MOSFET is connected after pin serial connection the 15th resistance, the 16th resistance and the 17th resistance is concatenated between OUTA pin and signal ground, and between the 16th resistance and the 17th resistance, draw the grid that one article of branch road connects the first power switch pipe MOSFET, the 18th resistance and the 19th resistance is concatenated between OUTB pin and signal ground, and between the 18th resistance and the 19th resistance, draw the grid that one article of branch road connects the second power switch pipe MOSFET, GND pin accesses signal ground, it is connected by coupling electric capacity between signal ground with simulation ground.