CN104284481A - Bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of LED lamp - Google Patents
Bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of LED lamp Download PDFInfo
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Abstract
The invention discloses a bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of an LED lamp. The bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of the LED lamp comprises an alternating-current power supply circuit, a control circuit, a coupling-out circuit and a ripple wave restraining circuit. The alternating-current power supply circuit comprises a constant-current drive chip U1, a constant-current drive chip U2, an alternating-current positive half-wave current loop and an alternating-current negative half-wave current loop, wherein the constant-current drive chip U1 and the constant-current drive chip U2 are controlled by the positive half-wave and the negative half-wave of an alternating-current power supply Uin. The current of the alternating-current positive half-wave current loop and the current of the alternating-current negative half-wave current loop both flow through a primary winding N11 and a primary winding N12 of a magnetic integration transformer TR so that an induced voltage can be generated on a secondary winding NV1 and a secondary winding NV2, and then the working voltage of the constant-current drive chip U1 and the working voltage of the constant-current drive chip U2 are provided through the control circuit. An induced secondary current is generated on a center post secondary winding N2 and is output to the loaded LED lamp through the coupling-out circuit. The ripple wave restraining circuit restrains current ripple waves. According to the bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of the LED lamp, a bridge rectifier and an electrolytic capacitor are not adopted, so that the electric power is increased, the reliability is improved, the drive capability of the chips is improved through expanded current, the working temperature of the chips is lowered, the service life of the chips is prolonged, the constant-current precision is high, the current ripple waves are small, the LED lamp does not flicker, and the circuits meet the environmental-friendliness principle.
Description
Technical field
The invention belongs to LED constant-current supply technology, particularly without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply.
Background technology
The DU family chip of Shanghai duty ratio Electronic Science and Technology Co., Ltd., that the analogue technique of the low cost of maturation and high-precision digital programming technique are combined, wherein, DU8966 chip is one of outstanding LED constant current power drives chip of cost performance, based on each pulse close-loop current constant control technology, be adapted to the condition that wide power voltage, wide load voltage and inductance parameters are wider, constant current accuracy is 3%, high PF power factor, low harmony wave THD; DU8966 built-in quasi-resonance TRUQR technology, makes each pulse of electronic power switch realize real " the lowest point switch ", reduces that EMI is flat disturbs level, electronic power switch loss and temperature rise, promotes electric work efficiency.DU8966 chip is as efficient source drive, and simple circuit, the percent of pass of production in enormous quantities, to input ac power wide region adaptability, all fine to the adaptability of load inductance amount error, rate of finished products is stablized.But the driving force being confined to built-in MOSFET is limited, DU8966 is only applicable to the middle low power LED of below 45W, is difficult to the high-powered LED lamp driving more than hectowatt grade.Moreover at present the LED constant-current supply of application DU8966 all adopts bridge rectifier, and bridge rectifier not only have lost the electric work power of low-tension supply, and cause in " work dead band " during non-conducting of bridge rectifier diode itself, reduce constant-current supply reliability; Adopt electrochemical capacitor to carry out the low ripple that filtering realizes LED at load end, the life-span due to electrochemical capacitor is far smaller than life-span of LED, decreases the useful life of constant-current supply, reduces reliability.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of do not use bridge rectifier and electrochemical capacitor lifting electric work power, improve reliability, improve chip drives ability, reduce chip operating temperature without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, thus realize its working life of raising, constant current accuracy is high, current ripples is little, LED is not glimmered, circuit environmental protection.
The present invention solves the problems of the technologies described above with following technical scheme:
Without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, comprising: ac power circuit, control circuit, coupling output circuit and ripple press down ordinary telegram road;
Described ac power circuit connects AC power Uin, comprise the constant-current driven chip U1 and high-voltage large-current electronic switch T1 that are controlled by AC power Uin positive half wave and the alternation of negative half-wave Polarity Control or half ripple of having a rest respectively, constant-current driven chip U2 and high-voltage large-current electronic switch T2, and, the alternating current positive half wave current circuit of conducting is controlled respectively and half-wave current loop born by alternating current by constant-current driven chip U1 and constant-current driven chip U2, the electric current of above-mentioned current circuit all flows through the former limit winding N11 of magnetic integrated transformer TR and former limit winding N12, to produce induced voltage respectively at the vice-side winding NV1 of magnetic integrated transformer TR and vice-side winding NV2, inductive secondary electric current is produced at the center pillar secondary winding N2 of magnetic integrated transformer TR,
Described control circuit comprises alternating current positive half wave current circuit and alternating current and bears the turn-on control circuit in half-wave current loop, the start-up circuit of constant-current driven chip U1 and constant-current driven chip U2, self-powered circuit and constant-current control circuit;
Described coupling output circuit outputs to load LED lamp the inductive secondary electric current that above-mentioned center pillar secondary winding N2 produces after rectification, filtering;
Described ripple presses down ordinary telegram road for reclaiming the harmonic wave THD and electromagnetic interference EMI that produce in AC power and ac power circuit, after rectification, output to load LED lamp;
Described constant-current driven chip U1 and constant-current driven chip U2 all adopts model to be the integrated chip of DU8966.
Described magnetic integrated transformer TR comprises " day " shaped magnetic core post, and, former limit winding N11 and former limit winding N12 is respectively symmetrically around on two side columns of " day " shaped magnetic core post, vice-side winding NV1 and vice-side winding NV2 is respectively symmetrically around on two side columns of " day " shaped magnetic core post, center pillar secondary winding N2 is around on the center pillar of " day " shaped magnetic core post, and additional winding N31 and additional winding N32 is respectively symmetrically around on two side columns of " day " shaped magnetic core post.
Described alternating current positive half wave current circuit is: at alternating current positive half wave, electric current flows out from the positive polarity L end of AC power Uin, flow through fuse wire F, the different name end of former limit winding N11 and Same Name of Ends, the collector and emitter of high-voltage large-current electronic switch T1, public zero potential OV, diode D2, the different name end of former limit winding N12 and Same Name of Ends successively, get back to the negative polarity N end of AC power Uin; Be controlled by this alternating current positive half wave, constant-current driven chip U1 works, and constant-current driven chip U2 does not work;
Half-wave current loop born by described alternating current: bear half-wave at alternating current, electric current flows out from the negative polarity N end of AC power Uin, flow through the Same Name of Ends of former limit winding N12 and different name end, the collector and emitter of high-voltage large-current electronic switch T2, public zero potential OV, diode D1, the Same Name of Ends of former limit winding N11 and different name end, fuse wire F successively, get back to the positive polarity L end of AC power Uin; Be controlled by this alternating current and bear half-wave, constant-current driven chip U2 works, and constant-current driven chip U1 does not work.
The turn-on control circuit of described alternating current positive half wave current circuit comprises: one end of start-up capacitance Cj1 connects the Same Name of Ends of former limit winding N11, the other end connects the positive pole of diode D6, the negative pole of diode D6 connects the Vgs pin of constant-current driven chip U1, one end of electric capacity of voltage regulation C71, the grid of low-voltage and high-current MOSFET pipe T51 and drain electrode through resistance R6 simultaneously, and the other end of electric capacity of voltage regulation C71 connects public zero potential OV; The source electrode of low-voltage and high-current MOSFET pipe T51 connects the grid of high-voltage large-current electronic switch T1 and one end of resistance R51 simultaneously, and the other end of resistance R51 connects the DRN pin of constant-current driven chip U1; When the voltage at electric capacity of voltage regulation C71 two ends is positive 15 volts, high-voltage large-current electronic switch T1 conducting, the conducting of alternating current positive half wave current circuit;
The turn-on control circuit that half-wave current loop born by described alternating current comprises: one end of start-up capacitance Cj2 connects the different name end of former limit winding N12, the other end connects the positive pole of diode D6, the negative pole of diode D6 connects the Vgs pin of constant-current driven chip U2 simultaneously through resistance R6, one end of electric capacity of voltage regulation C72, the grid of low-voltage and high-current MOSFET pipe T52 and drain electrode, the other end of electric capacity of voltage regulation C72 connects public zero potential OV, the source electrode of low-voltage and high-current MOSFET pipe T52 connects the grid of high-voltage large-current electronic switch T2 and one end of resistance R52 simultaneously, the other end of resistance R52 connects the DRN pin of constant-current driven chip U2, when the voltage at electric capacity of voltage regulation C72 two ends is positive 15 volts, high-voltage large-current electronic switch T2 conducting, the conducting of half-wave current loop born by alternating current.
The start-up circuit of described constant-current driven chip U1 comprises: at alternating current positive half wave, electric current flows out from the positive polarity L end of AC power Uin, flow through fuse wire F, the different name end of former limit winding N11 and Same Name of Ends, start-up capacitance Cj1, energy storage capacitor Cv, public zero potential OV, diode D2, the different name end of former limit winding N12 and Same Name of Ends successively, get back to the negative polarity N end of AC power Uin; The VCC pin of constant-current driven chip U1 is connected between start-up capacitance Cj1 and energy storage capacitor Cv, and when energy storage capacitor Cv both end voltage is greater than 7.5 volts, constant-current driven chip U1 starts work;
The start-up circuit of described constant-current driven chip U2 comprises: bear half-wave at alternating current, electric current flows out from the negative polarity N of AC power Uin end, flows through the Same Name of Ends of former limit winding N12 and different name end, start-up capacitance Cj2, energy storage capacitor Cv, public zero potential OV, diode D1, the Same Name of Ends different name end of former limit winding N11, fuse wire F successively, gets back to the positive polarity L end of AC power Uin; The VCC pin of constant-current driven chip U2 is connected between start-up capacitance Cj2 and energy storage capacitor Cv, and when energy storage capacitor Cv both end voltage is greater than 7.5 volts, constant-current driven chip U2 starts work;
Described self-powered circuit, for after constant-current driven chip U1 or constant-current driven chip U2 starts, provides the operating voltage of constant-current driven chip U1 or constant-current driven chip U2, this self-powered circuit comprises: the Same Name of Ends of vice-side winding NV1 connects the positive pole of diode D13 through current-limiting resistance R13, the negative pole of diode D13 connects the negative pole of diode D14, the positive pole of diode D14 connects the different name end of vice-side winding NV2 through current-limiting resistance R14, the VCC pin of constant-current driven chip U1, the VCC pin of constant-current driven chip U2 and one end of energy storage capacitor Cv are connected between diode D13 and diode D14 simultaneously, the other end of energy storage capacitor Cv, the different name end of vice-side winding NV1, the Same Name of Ends of vice-side winding NV2, the GND pin of constant-current driven chip U1 is all connected public zero potential OV with the GND pin of constant-current driven chip U2.
The constant-current control circuit of described constant-current driven chip U1 and constant-current driven chip U2 comprises: the induced voltage that vice-side winding NV1 exports feeds back to the FB pin of constant-current driven chip U1 through the dividing potential drop of resistance R11 and resistance r11, and the induced voltage that vice-side winding NV2 exports feeds back to the FB pin of constant-current driven chip U2 through the dividing potential drop of resistance R12 and resistance r12; One end of sampling resistor RCS connects the CS pin of constant-current driven chip U1 and the CS pin of constant-current driven chip U2 simultaneously, and the other end connects public zero potential OV.
Described coupling output circuit comprises: one end of center pillar secondary winding N2 connects one end of energy storage capacitor C01 and one end of energy storage capacitor C02 simultaneously, the other end of center pillar secondary winding N2 connects the positive pole of rectifier diode D01 and the negative pole of rectifier diode D02 simultaneously, the other end of energy storage capacitor C01 is all connected the positive terminal of load LED lamp with the negative pole of rectifier diode D01, and the other end of energy storage capacitor C02 is all connected the negative pole end of load LED lamp with the positive pole of rectifier diode D02; Load LED lamp two ends also RC parallel filtering circuit in parallel; By the number of turn of design center pillar secondary winding N2, the load LED lamp of adaptive each electric pressure.
Described ripple presses down ordinary telegram road and comprises: one end of additional winding N31 connects the positive pole of diode D311 and the negative pole of diode D312 after tuning coil L31 simultaneously, the other end connects one end of additional winding N32 and is connected between energy storage capacitor C01 and energy storage capacitor C02 simultaneously, the other end of additional winding N32 connects the positive pole of diode D321 and the negative pole of diode D322 after tuning coil L32 simultaneously, the negative pole of diode D311 is all connected the positive terminal of load LED lamp with the negative pole of diode D321, the positive pole of diode 312 is all connected the negative pole end of load LED lamp with the positive pole of diode D322.
Remarkable advantage of the present invention is:
1, after utilizing input ac power zero passage the half-wave period of positive half wave or negative half-wave Polarity Control two panels DU8966 integrated chip alternation or have a rest half ripple high-frequency PWM current constant control main circuit current, control high-voltage large-current electronic switch conducting by low-voltage and high-current MOSFET pipe source drive and form big current flow cycle, rectifier bridge is replaced to realize no bridge type rectification, the AC-AC mode of operation of direct generation high-frequency RF, improve power factor PF value, the electric work efficiency of effective lifting AC power, reduces cost.
2, without electrochemical capacitor, LED constant current power supply reliability is promoted.
3, use integrated magnetic, armature winding N11 and N12 is set at two side columns of common three post magnetic cores; Center pillar secondary winding N2 is arranged in magnetic core center pillar, arranges additional winding N31 and N32 at two side column edges, makes full use of the work that winding leakage inductance also participates in positive energy.Former limit winding N11 and N12 forms LC closed-loop path through start-up capacitance Cj1 and Cj2 and safety electric capacity Cx, when AC power Uin zero passage, or " the dead band period " of internal power electronic switch instantaneously, the harmonic wave negative energy that this recovery stray EM field, LC closed-loop path is originally harmful, be converted into the positive energy of center pillar secondary winding N2, additional winding N31 and N32, feed back to load LED lamp, both promoted electric work power, again reduced THD and EMI.
4, cause is without electrochemical capacitor, for the high ripple problem without filtering, the present invention utilizes between side column magnetic flux and center pillar resultant flux exists phase difference effect, at two side column edges, additional winding N31 and N32 is set, and seal in inductance L 31 respectively, inductance L 32, form respectively " series resonant tank " with electric capacity C01 and with electric capacity C02, be tuned at respectively in supply harmonic THD and there are two larger frequencies of harmonic energy, so originally harmful harmonic alternating current energy, turn harm into good, recovery is converted into DC current source, power to filter capacitor C0, play the effect pressing down flat LED current ripple, so, filter capacitor need not be made with the electrochemical capacitor of high capacitance, just can realize LED low ripple, both the integrity problem using electrochemical capacitor to cause had been avoided, it also avoid electrolyte pollution, realizing circuit environmental protection, improve reliability and the working life of constant-current supply,
5, at the big current flow cycle of ac power circuit, big current no longer resembles prior art and flows through the built-in MOSFET pipe of DU8966 integrated chip, can reduce chip operating temperature, improve its useful life;
6, DU8966 chip is exported by low-voltage and high-current MOSFET pipe source electrode and drives high-voltage large-current electronic switch, low-voltage and high-current MOSFET pipe plays and expands stream effect, realize small-power chip DU8966 and drive the object of high-voltage large-current electronic switch, thus realize DU8966 chip to apply to hectowatt grade high-powered LED lamp power supply from small-power control within 45 watts;
7, played DU8966 High Power Factor, adapted to wide power, adapted to wide load voltage, adaptation energy storage inductance is compared with wide tolerance but still have the advantage that constant current accuracy is high, current ripples is little, LED is not glimmered, cost is low;
8, with the capacitive reactance of start-up capacitance Cj1 and Cj2 as the startup scheme not consuming active power, replace traditional resistance reduced-voltage starting scheme.
9, the public zero potential in circuit is unsettled, realizes equipotential, can reduce the impact of thunder and lightning.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with Fig. 1, the specific embodiment of the present invention is further described.
As shown in Figure 1, without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, comprising: ac power circuit, control circuit, coupling output circuit and ripple press down ordinary telegram road;
Constant-current supply of the present invention adopts magnetic integrated transformer TR, comprise " day " shaped magnetic core post, and, former limit winding N11 and former limit winding N12 is respectively symmetrically around on two side columns of " day " shaped magnetic core post, vice-side winding NV1 and vice-side winding NV2 is respectively symmetrically around on two side columns of " day " shaped magnetic core post, center pillar secondary winding N2 is around on the center pillar of " day " shaped magnetic core post, and additional winding N31 and additional winding N32 is respectively symmetrically around on two side columns of " day " shaped magnetic core post.
Described ac power circuit connects AC power Uin, comprise the constant-current driven chip U1 and high-voltage large-current electronic switch T1 that are controlled by AC power Uin positive half wave and the alternation of negative half-wave Polarity Control or half ripple of having a rest respectively, constant-current driven chip U2 and high-voltage large-current electronic switch T2, and, the alternating current positive half wave current circuit of conducting is controlled respectively and half-wave current loop born by alternating current by constant-current driven chip U1 and constant-current driven chip U2, the electric current of above-mentioned current circuit all flows through the former limit winding N11 of magnetic integrated transformer TR and former limit winding N12, to produce induced voltage respectively at the vice-side winding NV1 of magnetic integrated transformer TR and vice-side winding NV2, inductive secondary electric current is produced at the center pillar secondary winding N2 of magnetic integrated transformer TR, constant-current driven chip U1 and constant-current driven chip U2 all adopts model to be the integrated chip of DU8966.
Described alternating current positive half wave current circuit is: at alternating current positive half wave, electric current flows out from the positive polarity L end of AC power Uin, flow through fuse wire F, the different name end of former limit winding N11 and Same Name of Ends, the collector and emitter of high-voltage large-current electronic switch T1, public zero potential OV, diode D2, the different name end of former limit winding N12 and Same Name of Ends successively, get back to the negative polarity N end of AC power Uin; Be controlled by this alternating current positive half wave, constant-current driven chip U1 works, and constant-current driven chip U2 does not work;
Half-wave current loop born by described alternating current: bear half-wave at alternating current, electric current flows out from the negative polarity N end of AC power Uin, flow through the Same Name of Ends of former limit winding N12 and different name end, the collector and emitter of high-voltage large-current electronic switch T2, public zero potential OV, diode D1, the Same Name of Ends of former limit winding N11 and different name end, fuse wire F successively, get back to the positive polarity L end of AC power Uin; Be controlled by this alternating current and bear half-wave, constant-current driven chip U2 works, and constant-current driven chip U1 does not work.
Described control circuit comprises the turn-on control circuit that half-wave current loop born by alternating current positive half wave current circuit and alternating current, the start-up circuit of constant-current driven chip U1 and constant-current driven chip U2, self-powered circuit and constant-current control circuit;
The turn-on control circuit of described alternating current positive half wave current circuit comprises: one end of start-up capacitance Cj1 connects the Same Name of Ends of former limit winding N11, the other end connects the positive pole of diode D6, the negative pole of diode D6 connects the Vgs pin of constant-current driven chip U1, one end of electric capacity of voltage regulation C71, the grid of low-voltage and high-current MOSFET pipe T51 and drain electrode through resistance R6 simultaneously, and the other end of electric capacity of voltage regulation C71 connects public zero potential OV; The source electrode of low-voltage and high-current MOSFET pipe T51 connects the grid of high-voltage large-current electronic switch T1 and one end of resistance R51 simultaneously, and the other end of resistance R51 connects the DRN pin of constant-current driven chip U1; Ignore the conducting internal resistance rcs (on) of low-voltage and high-current MOSFET pipe T51, the voltage being equivalent to electric capacity of voltage regulation C71 two ends is positive 15 volts of Direct driver high-voltage large-current electronic switch T1 conducting, the conducting of alternating current positive half wave current circuit;
The turn-on control circuit that half-wave current loop born by described alternating current comprises: one end of start-up capacitance Cj2 connects the different name end of former limit winding N12, the other end connects the positive pole of diode D6, the negative pole of diode D6 connects the Vgs pin of constant-current driven chip U2 simultaneously through resistance R6, one end of electric capacity of voltage regulation C72, the grid of low-voltage and high-current MOSFET pipe T52 and drain electrode, the other end of electric capacity of voltage regulation C72 connects public zero potential OV, the source electrode of low-voltage and high-current MOSFET pipe T52 connects the grid of high-voltage large-current electronic switch T2 and one end of resistance R52 simultaneously, the other end of R52 connects the DRN pin of constant-current driven chip U2, ignore the conducting internal resistance rcs (on) of low-voltage and high-current MOSFET pipe T52, the voltage being equivalent to electric capacity of voltage regulation C72 two ends is positive 15 volts of Direct driver high-voltage large-current electronic switch T2 conducting, and the conducting of half-wave current loop born by alternating current.
The start-up circuit of described constant-current driven chip U1 comprises: at alternating current positive half wave, electric current flows out from the positive polarity L end of AC power Uin, flow through fuse wire F, the different name end of former limit winding N11 and Same Name of Ends, start-up capacitance Cj1, energy storage capacitor Cv, public zero potential OV, diode D2, the different name end of former limit winding N12 and Same Name of Ends successively, get back to the negative polarity N end of AC power Uin; The VCC pin of constant-current driven chip U1 is connected between start-up capacitance Cj1 and energy storage capacitor Cv, and when energy storage capacitor Cv both end voltage is greater than 7.5 volts, constant-current driven chip U1 starts work;
The start-up circuit of described constant-current driven chip U2 comprises: bear half-wave at alternating current, electric current flows out from the negative polarity N of AC power Uin end, flows through the Same Name of Ends of former limit winding N12 and different name end, start-up capacitance Cj2, energy storage capacitor Cv, public zero potential OV, diode D1, the Same Name of Ends different name end of former limit winding N11, fuse wire F successively, gets back to the positive polarity L end of AC power Uin; The VCC pin of constant-current driven chip U2 is connected between start-up capacitance Cj2 and energy storage capacitor Cv, and when energy storage capacitor Cv both end voltage is greater than 7.5 volts, constant-current driven chip U2 starts work;
Described self-powered circuit, for after constant-current driven chip U1 or constant-current driven chip U2 starts, provides the operating voltage of constant-current driven chip U1 or constant-current driven chip U2, this self-powered circuit comprises: the Same Name of Ends of vice-side winding NV1 connects the positive pole of diode D13 through current-limiting resistance R13, the negative pole of diode D13 connects the negative pole of diode D14, the positive pole of diode D14 connects the different name end of vice-side winding NV2 through current-limiting resistance R14, the VCC pin of constant-current driven chip U1, the VCC pin of constant-current driven chip U2 and one end of energy storage capacitor Cv are connected between diode D13 and diode D14 simultaneously, the other end of energy storage capacitor Cv, the different name end of vice-side winding NV1, the Same Name of Ends of vice-side winding NV2, the GND pin of constant-current driven chip U1 is all connected public zero potential OV with the GND pin of constant-current driven chip U2.
The constant-current control circuit of described constant-current driven chip U1 and constant-current driven chip U2 comprises: the induced voltage that vice-side winding NV1 exports feeds back to the FB pin of constant-current driven chip U1 through the dividing potential drop of resistance R11 and resistance r11, and the induced voltage that vice-side winding NV2 exports feeds back to the FB pin of constant-current driven chip U2 through the dividing potential drop of resistance R12 and resistance r12; One end of sampling resistor RCS connects the CS pin of constant-current driven chip U1 and the CS pin of constant-current driven chip U2 simultaneously, and the other end connects public zero potential OV.
Also piezo-resistance Rv in parallel and safety electric capacity Cx is distinguished, in order to protective circuit at the series arm two ends of AC power Uin series connection fuse wire F; Between the emitter and grid of high-voltage large-current electronic switch T1, connect the protection diode DZ1 of 15V, between the emitter and grid of high-voltage large-current electronic switch T2, connect the protection diode DZ2 of 15V.
Described coupling output circuit comprises: one end of center pillar secondary winding N2 connects one end of energy storage capacitor C01 and one end of energy storage capacitor C02 simultaneously, the other end of center pillar secondary winding N2 connects the positive pole of rectifier diode D01 and the negative pole of rectifier diode D02 simultaneously, the other end of energy storage capacitor C01 is all connected the positive terminal of load LED lamp with the negative pole of rectifier diode D01, and the other end of energy storage capacitor C02 is all connected the negative pole end of load LED lamp with the positive pole of rectifier diode D02; Load LED lamp two ends also RC parallel filtering circuit in parallel.RC parallel filtering circuit comprises filter capacitor C0 in parallel and resistance R0.By the number of turn of design center pillar secondary winding N2, the load LED lamp of adaptive each electric pressure in the market.
Described ripple presses down ordinary telegram road and comprises: one end of additional winding N31 connects the positive pole of diode D311 and the negative pole of diode D312 after tuning coil L31 simultaneously, the other end connects one end of additional winding N32 and is connected between energy storage capacitor C01 and energy storage capacitor C02 simultaneously, the other end of additional winding N32 connects the positive pole of diode D321 and the negative pole of diode D322 after tuning coil L32 simultaneously, the negative pole of diode D311 is all connected the positive terminal of load LED lamp with the negative pole of diode D321, the positive pole of diode 312 is all connected the negative pole end of load LED lamp with the positive pole of diode D322.
The operation principle of the turn-on control circuit of described alternating current positive half wave current circuit is: due to the capacitive reactance current limliting of start-up capacitance Cj1, to the Vgs pin powered of constant-current driven chip U1, play the effect of the voltage-stabiliser tube of this Vgs pin built-in 15 volts, 8 milliamperes, make electric capacity of voltage regulation C71 two ends have stable electrical positive pressure 15 ± 1 volts.When the DRN pin of constant-current driven chip U1 and CS pin inner portions are to logical, be considered as between this DRN pin and CS pin, having 0.5 ohm of small resistor to connect, source drive low-voltage and high-current MOSFET pipe T51 conducting, be equivalent to the Vgs pin voltage stabilizing 15 ± 1 volts the gate turn-on constant-current driven chip U1 of high-voltage large-current electronic switch T1, so high-voltage large-current electronic switch T1 conducting, big current is had to circulate described alternating current positive half wave current circuit, and this big current no longer flows through the built-in metal-oxide-semiconductor of constant-current driven chip U1, constant-current driven chip U1 reduces heating.The operation principle that the turn-on control circuit in half-wave current loop born by alternating current is the same.Thus, achieve " without bridge " work of no bridge type rectification, the AC power directly realizing low frequency AF transfers the AC-AC mode of operation that constant-current driven chip U1 controls the high-frequency RF of high-voltage large-current electronic switch T1 to, has saved bridge rectifier, reduce costs, improve electric work efficiency.
For the industrial powers of 50 hertz, every half ripple of alternating current accounts for 10 milliseconds.At alternating current positive half wave, when energy storage capacitor Cv both end voltage is greater than 7.5 volts, constant-current driven chip U1 starts work; Above-mentioned 10 milliseconds of positive half wave periods, diode D2 conducting, makes the high-voltage large-current electronic switch T2 rest 10 milliseconds that do not work out of control; When after constant-current driven chip U1 startup work, provide operating voltage by self-powered circuit to constant-current driven chip U1, when power supply electric capacity Cv two ends electricity end is between 7.5 to 27 volts, constant-current driven chip U1 normally works; When power supply electric capacity Cv two ends electricity end is lower than 7.5 volts, constant-current driven chip U1 under-voltage protection; When power supply electric capacity Cv two ends electricity end is higher than 27 volts, constant-current driven chip U1 overvoltage protection.In like manner, bear half-wave at alternating current, diode D1 conducting, the high-voltage large-current electronic switch T1 rest 10 milliseconds that do not work out of control, constant-current driven chip U2 operation principle is the same.
When the alternating current zero passage of AC power Uin input, the time that power supply electric capacity Cv both end voltage is greater than 7.5 volts is greater than 10ms, then constant-current driven chip U1 and constant-current driven chip U2 all works, but now AC-less power energy input, be called in " dead band ".
The operation principle of described coupling output circuit is: when in 10 milliseconds of periods of alternating current positive half wave, constant-current driven chip U1 drives high-voltage large-current electronic switch T1 work, the interchange of 50 He Zhi changes the pulse of 20 kilo hertzs of sesame superaudios into, at this moment the side column magnetic flux of magnetic integrated transformer TR flows to center pillar from right to left, and center pillar magnetic flux flows from left to right; Otherwise, when bearing 10 milliseconds of periods of half-wave at alternating current, constant-current driven chip U2 drives high-voltage large-current electronic switch T2 work, and the alternating current of 50 He Zhi changes the pulse of 20 kilo hertzs of sesame superaudios into, at this moment side column magnetic flux flows to center pillar from left to right, and center pillar magnetic flux flows from right to left; The magnetic flux cutting center pillar secondary winding N2 of two-way flow, produce inductive secondary electric current I LED, through rectifier diode D01 and rectifier diode D02 rectification, become direct current and be stored in energy storage capacitor C01 and energy storage capacitor C02, the filter capacitor C0 simultaneously to RC parallel filtering circuit charges and powers to load LED lamp.Due to rectifier diode D01 and rectifier diode D02, and be combined between energy storage capacitor C01 and energy storage capacitor C02 " times voltage commutation ", there is automatic frequency multiplication effect, so, the filter capacitor CO of RC parallel filtering circuit need not use the electrochemical capacitor of high capacitance, just can obtain lower ripple; Be better than common traditional inverse-excitation type halfwave rectifier to LED power occur larger ripple.
At alternating current positive half wave, no matter whether constant-current driven chip U1 works, and when sampling resistor RCS two ends pressure drop reaches 1.2 volts, this pulse ends; It is zero that the FB pin of constant-current driven chip U1 detects inductive current, and when meeting " the lowest point switch " principle, constant-current driven chip U1 just exports next pulse enabling signal, realizes the meticulous regulation and control of pulse duty factor one by one, realizes 3% constant current accuracy.In like manner, bear half-wave at alternating current, constant-current driven chip U2 also realizes the meticulous regulation and control of pulse duty factor one by one, realizes 3% constant current accuracy.
Load LED lamp viewed from voltage-current characteristic, its essence is that a string dog days' voltage stabilizing didoe is connected, so, must power to load LED lamp with DC current source constant current, be different from traditional powering to load LED lamp with direct voltage source voltage stabilizing, obviously improve the reliability of load LED lamp work.
Because AC power itself exists harmonic wave, more because constant-current driven chip U1 and constant-current driven chip U2 alternation control high-voltage large-current electronic switch T1 respectively and run with the HF switch of high-voltage large-current electronic switch T2, add the non-linear of magnetic characteristic B=f (H) curve, certainly exist THD harmonic wave, these THD humorous EMI of involving interference all belongs to harmful negative energy; For this reason, these negative energies are reclaimed by additional winding N31 and additional winding N32, by diode D311, diode D312, diode D321 and diode D322, the negative energy reclaimed is converted into DC current source positive energy respectively, charge to filter capacitor C0 and power to load LED lamp simultaneously, press down the current ripples of flat load LED lamp, so electrochemical capacitor need not be used also to have low ripple, improve cost performance.
Can also be further, tuning coil L31 is increased between one end and the positive pole of diode D311 of additional winding N31, and tuning coil L32 is increased between one end and the positive pole of diode D321 of additional winding N32, the harmonic frequency that among tuning THD harmonic wave, energy is comparatively concentrated, makes the above-mentioned effect turned harm into good more effective.
Preferred low-voltage and high-current MOSFET pipe T51 and low-voltage and high-current MOSFET pipe T52 is the low-voltage MOSFET of about 20V, the high sensitivity of Ugs4.5v saturation conduction, big current are about the MOSFET pipe that 5 peaces to 20 are pacified, and price is very cheap.Because low-voltage and high-current MOSFET pipe T51 and low-voltage and high-current MOSFET pipe T52 is operated in source electrode output services situation, its output impedance is very low, high efficiency reliably can control high-voltage large-current electronic switch T1 and high-voltage large-current electronic switch T2 respectively.The MOSFET pipe 10N02 that the low-voltage and high-current MOSFET pipe T51 of the present embodiment and low-voltage and high-current MOSFET pipe T52 adopts 20 volt 10 to pacify, high-voltage large-current electronic switch T1 and high-voltage large-current electronic switch T2 adopts the IGBT24N65 of 650 volts of 24A, electric capacity of voltage regulation C71 and C72 is 105/25V electric capacity, constant-current supply of the present invention can be made to have below 1000W power output by the value of flexible design sampling resistor RCS, so, constant-current supply of the present invention can make DU8966 integrated chip from only having less than 45 watts small-power driving forces, expand to more than hundreds of watts high-power driving abilities, the significant increase cost performance of constant-current supply, meet the demand of high-powered LED lamp to high-power constant-current supply.
Claims (8)
1. without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, it is characterized in that, comprising: ac power circuit, control circuit, coupling output circuit and ripple press down ordinary telegram road;
Described ac power circuit connects AC power Uin, comprise the constant-current driven chip U1 and high-voltage large-current electronic switch T1 that are controlled by AC power Uin positive half wave and the alternation of negative half-wave Polarity Control or half ripple of having a rest respectively, constant-current driven chip U2 and high-voltage large-current electronic switch T2, and, the alternating current positive half wave current circuit of conducting is controlled respectively and half-wave current loop born by alternating current by constant-current driven chip U1 and constant-current driven chip U2, the electric current of above-mentioned current circuit all flows through the former limit winding N11 of magnetic integrated transformer TR and former limit winding N12, to produce induced voltage respectively at the vice-side winding NV1 of magnetic integrated transformer TR and vice-side winding NV2, inductive secondary electric current is produced at the center pillar secondary winding N2 of magnetic integrated transformer TR,
Described control circuit comprises alternating current positive half wave current circuit and alternating current and bears the turn-on control circuit in half-wave current loop, the start-up circuit of constant-current driven chip U1 and constant-current driven chip U2, self-powered circuit and constant-current control circuit;
Described coupling output circuit outputs to load LED lamp the inductive secondary electric current that above-mentioned center pillar secondary winding N2 produces after rectification, filtering;
Described ripple presses down ordinary telegram road for reclaiming the harmonic wave THD and electromagnetic interference EMI that produce in AC power and ac power circuit, after rectification, output to load LED lamp;
Described constant-current driven chip U1 and constant-current driven chip U2 all adopts model to be the integrated chip of DU8966.
2. according to claim 1 without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, it is characterized in that, described magnetic integrated transformer TR comprises " day " shaped magnetic core post, and, former limit winding N11 and former limit winding N12 is respectively symmetrically around on two side columns of " day " shaped magnetic core post, vice-side winding NV1 and vice-side winding NV2 is respectively symmetrically around on two side columns of " day " shaped magnetic core post, center pillar secondary winding N2 is around on the center pillar of " day " shaped magnetic core post, additional winding N31 and additional winding N32 is respectively symmetrically around on two side columns of " day " shaped magnetic core post.
3. according to claim 1 without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, it is characterized in that, described alternating current positive half wave current circuit is: at alternating current positive half wave, electric current flows out from the positive polarity L end of AC power Uin, flow through fuse wire F, the different name end of former limit winding N11 and Same Name of Ends, the collector and emitter of high-voltage large-current electronic switch T1, public zero potential OV, diode D2, the different name end of former limit winding N12 and Same Name of Ends successively, get back to the negative polarity N end of AC power Uin; Be controlled by this alternating current positive half wave, constant-current driven chip U1 works, and constant-current driven chip U2 does not work;
Half-wave current loop born by described alternating current: bear half-wave at alternating current, electric current flows out from the negative polarity N end of AC power Uin, flow through the Same Name of Ends of former limit winding N12 and different name end, the collector and emitter of high-voltage large-current electronic switch T2, public zero potential OV, diode D1, the Same Name of Ends of former limit winding N11 and different name end, fuse wire F successively, get back to the positive polarity L end of AC power Uin; Be controlled by this alternating current and bear half-wave, constant-current driven chip U2 works, and constant-current driven chip U1 does not work.
4. according to claim 1 without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, it is characterized in that, the turn-on control circuit of described alternating current positive half wave current circuit comprises: one end of start-up capacitance Cj1 connects the Same Name of Ends of former limit winding N11, the other end connects the positive pole of diode D6, the negative pole of diode D6 connects the Vgs pin of constant-current driven chip U1, one end of electric capacity of voltage regulation C71, the grid of low-voltage and high-current MOSFET pipe T51 and drain electrode through resistance R6 simultaneously, and the other end of electric capacity of voltage regulation C71 connects public zero potential OV; The source electrode of low-voltage and high-current MOSFET pipe T51 connects the grid of high-voltage large-current electronic switch T1 and one end of resistance R51 simultaneously, and the other end of resistance R51 connects the DRN pin of constant-current driven chip U1; When the voltage at electric capacity of voltage regulation C71 two ends is positive 15 volts, high-voltage large-current electronic switch T1 conducting, the conducting of alternating current positive half wave current circuit;
The turn-on control circuit that half-wave current loop born by described alternating current comprises: one end of start-up capacitance Cj2 connects the different name end of former limit winding N12, the other end connects the positive pole of diode D6, the negative pole of diode D6 connects the Vgs pin of constant-current driven chip U2 simultaneously through resistance R6, one end of electric capacity of voltage regulation C72, the grid of low-voltage and high-current MOSFET pipe T52 and drain electrode, the other end of electric capacity of voltage regulation C72 connects public zero potential OV, the source electrode of low-voltage and high-current MOSFET pipe T52 connects the grid of high-voltage large-current electronic switch T2 and one end of resistance R52 simultaneously, the other end of resistance R52 connects the DRN pin of constant-current driven chip U2, when the voltage at electric capacity of voltage regulation C72 two ends is positive 15 volts, high-voltage large-current electronic switch T2 conducting, the conducting of half-wave current loop born by alternating current.
5. according to claim 1 without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, it is characterized in that, the start-up circuit of described constant-current driven chip U1 comprises: at alternating current positive half wave, electric current flows out from the positive polarity L end of AC power Uin, flow through fuse wire F, the different name end of former limit winding N11 and Same Name of Ends, start-up capacitance Cj1, energy storage capacitor Cv, public zero potential OV, diode D2, the different name end of former limit winding N12 and Same Name of Ends successively, get back to the negative polarity N end of AC power Uin; The VCC pin of constant-current driven chip U1 is connected between start-up capacitance Cj1 and energy storage capacitor Cv, and when energy storage capacitor Cv both end voltage is greater than 7.5 volts, constant-current driven chip U1 starts work;
The start-up circuit of described constant-current driven chip U2 comprises: bear half-wave at alternating current, electric current flows out from the negative polarity N of AC power Uin end, flows through the Same Name of Ends of former limit winding N12 and different name end, start-up capacitance Cj2, energy storage capacitor Cv, public zero potential OV, diode D1, the Same Name of Ends different name end of former limit winding N11, fuse wire F successively, gets back to the positive polarity L end of AC power Uin; The VCC pin of constant-current driven chip U2 is connected between start-up capacitance Cj2 and energy storage capacitor Cv, and when energy storage capacitor Cv both end voltage is greater than 7.5 volts, constant-current driven chip U2 starts work;
Described self-powered circuit, for after constant-current driven chip U1 or constant-current driven chip U2 starts, provides the operating voltage of constant-current driven chip U1 or constant-current driven chip U2, this self-powered circuit comprises: the Same Name of Ends of vice-side winding NV1 connects the positive pole of diode D13 through current-limiting resistance R13, the negative pole of diode D13 connects the negative pole of diode D14, the positive pole of diode D14 connects the different name end of vice-side winding NV2 through current-limiting resistance R14, the VCC pin of constant-current driven chip U1, the VCC pin of constant-current driven chip U2 and one end of energy storage capacitor Cv are connected between diode D13 and diode D14 simultaneously, the other end of energy storage capacitor Cv, the different name end of vice-side winding NV1, the Same Name of Ends of vice-side winding NV2, the GND pin of constant-current driven chip U1 is all connected public zero potential OV with the GND pin of constant-current driven chip U2.
6. according to claim 1 without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, it is characterized in that, the constant-current control circuit of described constant-current driven chip U1 and constant-current driven chip U2 comprises: the induced voltage that vice-side winding NV1 exports feeds back to the FB pin of constant-current driven chip U1 through the dividing potential drop of resistance R11 and resistance r11, and the induced voltage that vice-side winding NV2 exports feeds back to the FB pin of constant-current driven chip U2 through the dividing potential drop of resistance R12 and resistance r12; One end of sampling resistor RCS connects the CS pin of constant-current driven chip U1 and the CS pin of constant-current driven chip U2 simultaneously, and the other end connects public zero potential OV.
7. according to claim 1 without bridge no electrolytic capacitor low ripple high-powered LED lamp constant-current supply, it is characterized in that, described coupling output circuit comprises: one end of center pillar secondary winding N2 connects one end of energy storage capacitor C01 and one end of energy storage capacitor C02 simultaneously, the other end of center pillar secondary winding N2 connects the positive pole of rectifier diode D01 and the negative pole of rectifier diode D02 simultaneously, the other end of energy storage capacitor C01 is all connected the positive terminal of load LED lamp with the negative pole of rectifier diode D01, the other end of energy storage capacitor C02 is all connected the negative pole end of load LED lamp with the positive pole of rectifier diode D02, load LED lamp two ends also RC parallel filtering circuit in parallel, by the number of turn of design center pillar secondary winding N2, the load LED lamp of adaptive each electric pressure.
8. controllable silicon light modulation low pressure flicker free LED constant-current supply according to claim 1, it is characterized in that, described ripple presses down ordinary telegram road and comprises: one end of additional winding N31 connects the positive pole of diode D311 and the negative pole of diode D312 after tuning coil L31 simultaneously, the other end connects one end of additional winding N32 and is connected between energy storage capacitor C01 and energy storage capacitor C02 simultaneously, the other end of additional winding N32 connects the positive pole of diode D321 and the negative pole of diode D322 after tuning coil L32 simultaneously, the negative pole of diode D311 is all connected the positive terminal of load LED lamp with the negative pole of diode D321, the positive pole of diode 312 is all connected the negative pole end of load LED lamp with the positive pole of diode D322.
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