CN104284481B - The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge - Google Patents
The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge Download PDFInfo
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- CN104284481B CN104284481B CN201410425933.5A CN201410425933A CN104284481B CN 104284481 B CN104284481 B CN 104284481B CN 201410425933 A CN201410425933 A CN 201410425933A CN 104284481 B CN104284481 B CN 104284481B
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Abstract
The invention discloses without bridge no electrolytic capacitor low ripple high-powered LED lamp constant current source, press down ordinary telegram road including ac power circuit, control circuit, coupling output circuit and ripple；Ac power circuit includes constant-current driven chip U1 and U2 being controlled by the positive and negative half-wave of alternating current power supply Uin, and alternating current positive and negative half-wave current loop, the electric current of above-mentioned current loop all flows through primary side winding N11 and the N12 of magnetic integrated transformer TR, to be respectively induced the voltage running voltage through control circuit offer constant-current driven chip U1 and U2 at vice-side winding NV1 and NV2, produce the sensing coupled output circuit of secondary current at center pillar secondary windings N2 and export load LED lamp；Ripple presses down ordinary telegram road and stabilizes current ripples；The constant current source of the present invention does not use bridge rectifier and electrochemical capacitor and promotes electric work power, improves reliability, expands stream and promote chip drives ability, reduce that chip operating temperature improves the life-span, constant current accuracy is high, current ripples is little, LED does not flashes, circuit meets environmental friendly principle.
Description
Technical field
The invention belongs to LED constant current source technology, particularly to without bridge no electrolytic capacitor low ripple high-powered LED lamp Constant Electric Current
Source.
Background technology
The DU family chip of Shanghai dutycycle Electronic Science and Technology Co., Ltd., is the analogue technique ripe low cost and high accuracy
Digital programming technique combine, wherein, DU8966 chip is one of outstanding LED constant current power drives chip of cost performance, base
In each pulse close-loop current constant control technology, it is adapted to the condition that wide power voltage, wide load voltage and inductance parameters are wider, permanent
Stream precision is 3%, high PF power factor, low harmony wave THD；DU8966 built-in quasi-resonance TRUQR technology, makes electronic power switch every
Individual pulse all realizes 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 as efficient source drive, simple circuit, the percent of pass of production in enormous quantities, to input AC electricity
Source width range accommodation, all fine to the adaptability of load inductance amount error, yield rate is stable.But, it is confined to built-in
The driving force of MOSFET is limited, and DU8966 is only applicable to the middle low power LED of below 45W, it is difficult to drive more than hectowatt grade
High-powered LED lamp.Furthermore, the LED constant current source of application DU8966 all uses bridge rectifier at present, and bridge rectifier not only loses
The electric work power of low-tension supply, and causing when not turning on " work dead band " of bridge rectifier diode itself, reduce constant current
Power supply reliability；Electrochemical capacitor is used to be filtered realizing the low ripple of LED, owing to the life-span of electrochemical capacitor is remote at load end
Much smaller than the life-span of LED, decrease the service life of constant current source, reduce reliability.
Summary of the invention
The technical problem to be solved in the present invention is to provide and a kind of does not use the lifting electric work power of bridge rectifier and electrochemical capacitor, raising
Reliability, the chip drives ability that improves, the low ripple high-powered LED lamp constant current of no electrolytic capacitor without bridge of reduction chip operating temperature
Power supply, thus realize improving its working life, constant current accuracy is high, current ripples is little, LED does not flashes, circuit environmental protection.
The present invention is with the following technical scheme above-mentioned technical problem of solution:
The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge, including: ac power circuit, control circuit, coupling
Output circuit and ripple press down ordinary telegram road；
Described ac power circuit connects alternating current power supply Uin, including being controlled by alternating current power supply Uin positive half-wave and negative half-wave polarity
Control alternation or the constant-current driven chip U1 of half ripple of having a rest and high-voltage large-current electronic switch T1, constant-current driven chip U2
With high-voltage large-current electronic switch T2, and, by constant-current driven chip U1 and constant-current driven chip U2 respectively control conducting friendship
Half-wave current loop born by stream electricity positive half-wave current loop and alternating current, and the electric current of above-mentioned current loop all flows through magnetic integrated transformer TR
Primary side winding N11 and primary side winding N12, produce respectively with the vice-side winding NV1 and vice-side winding NV2 at magnetic integrated transformer TR
Induced voltage, produces sensing secondary current at the center pillar secondary windings N2 of magnetic integrated transformer TR；
Described control circuit includes that alternating current positive half-wave current loop and alternating current bear the turn-on control circuit in half-wave current loop, perseverance
Stream driving chip U1 and the start-up circuit of constant-current driven chip U2, self-powered circuit and constant-current control circuit；
The sensing secondary current that described coupling output circuit produces above-mentioned center pillar secondary windings N2 is rectified, after filtering output to negative
Carry LED；
Described ripple press down ordinary telegram road for reclaim in alternating current power supply and ac power circuit produce harmonic wave THD and electromagnetic interference EMI,
After rectified, output is to load LED lamp；
The integrated chip that described constant-current driven chip U1 and constant-current driven chip U2 all uses model to be DU8966.
Described magnetic integrated transformer TR includes " day " shaped magnetic core post, and, primary side winding N11 and primary side winding N12 are the most right
Being wound on two side columns of " day " shaped magnetic core post with claiming, vice-side winding NV1 and vice-side winding NV2 is wound on being respectively symmetrically
On two side columns of " day " shaped magnetic core post, center pillar secondary windings N2 is wound on the center pillar of " day " shaped magnetic core post, additional around
Group N31 and additional winding N32 is wound on two side columns of " day " shaped magnetic core post with being respectively symmetrically.
Described alternating current positive half-wave current loop is: at alternating current positive half-wave, electric current is from the positive polarity L end stream of alternating current power supply Uin
Go out, flow through fuse wire F, the different name end of primary side winding N11 and Same Name of Ends, the collection of high-voltage large-current electronic switch T1 successively
Electrode and emitter stage, public zero potential OV, diode D2, the different name end of primary side winding N12 and Same Name of Ends, return to alternating current power supply
The negative polarity N end of Uin；Being controlled by this alternating current positive half-wave, constant-current driven chip U1 works, and constant-current driven chip U2 does not works；
Half-wave current loop born by described alternating current: bear half-wave at alternating current, and electric current is from the negative polarity N end stream of alternating current power supply Uin
Go out, flow through Same Name of Ends and different name end, the colelctor electrode of high-voltage large-current electronic switch T2 and the transmitting of primary side winding N12 successively
Pole, public zero potential OV, diode D1, the Same Name of Ends of primary side winding N11 and different name end, fuse wire F, return to alternating current
The positive polarity L end of source Uin；Being controlled by this alternating current and bear half-wave, constant-current driven chip U2 works, constant-current driven chip U1 not work
Make.
The turn-on control circuit of described alternating current positive half-wave current loop includes: one end of start-up capacitance Cj1 connects primary side winding N11
Same Name of Ends, the other end connect diode D6 positive pole, the negative pole of diode D6 is simultaneously connected with constant-current driven chip U1 through resistance R6
Vgs pin, one end of electric capacity of voltage regulation C71, the grid of low-voltage and high-current MOSFET pipe T51 and drain electrode, electric capacity of voltage regulation C71's
The other end connects public zero potential OV；The source electrode of low-voltage and high-current MOSFET pipe T51 is simultaneously connected with high-voltage large current electronic cutting
Closing grid and one end of resistance R51 of T1, the other end of resistance R51 connects the DRN pin of constant-current driven chip U1；When voltage stabilizing electricity
When the voltage at appearance C71 two ends is positive 15 volts, high-voltage large-current electronic switch T1 turns on, and alternating current positive half-wave current loop is led
Logical；
Described alternating current is born the turn-on control circuit in half-wave current loop and is included: one end of start-up capacitance Cj2 connects primary side winding N12
Different name end, the other end connect diode D6 positive pole, the negative pole of diode D6 is simultaneously connected with constant-current driven chip U2 through resistance R6
Vgs pin, one end of electric capacity of voltage regulation C72, the grid of low-voltage and high-current MOSFET pipe T52 and drain electrode, electric capacity of voltage regulation C72's
The other end connects public zero potential OV, and the source electrode of low-voltage and high-current MOSFET pipe T52 is simultaneously connected with high-voltage large current electronic cutting
Closing grid and one end of resistance R52 of T2, the other end of resistance R52 connects the DRN pin of constant-current driven chip U2；When voltage stabilizing electricity
When the voltage at appearance C72 two ends is positive 15 volts, high-voltage large-current electronic switch T2 turns on, and alternating current is born half-wave current loop and led
Logical.
The start-up circuit of described constant-current driven chip U1 includes: at alternating current positive half-wave, electric current is from positive polarity L of alternating current power supply Uin
End flows out, and flows through fuse wire F, the different name end of primary side winding N11 and Same Name of Ends, start-up capacitance Cj1, energy storage capacitor successively
Cv, public zero potential OV, diode D2, the different name end of primary side winding N12 and Same Name of Ends, return to the negative polarity of alternating current power supply Uin
N end；The VCC pin of constant-current driven chip U1 is connected between start-up capacitance Cj1 and energy storage capacitor Cv, when energy storage capacitor Cv two ends
Voltage is more than 7.5 volts, and constant-current driven chip U1 starts work；
The start-up circuit of described constant-current driven chip U2 includes: bear half-wave at alternating current, and electric current is from negative polarity N of alternating current power supply Uin
End flows out, and flows through Same Name of Ends and different name end, start-up capacitance Cj2, energy storage capacitor Cv, the public zero potential of primary side winding N12 successively
OV, diode D1, the Same Name of Ends different name end of primary side winding N11, fuse wire F, return to positive polarity L of alternating current power supply Uin
End；The VCC pin of constant-current driven chip U2 is connected between start-up capacitance Cj2 and energy storage capacitor Cv, when energy storage capacitor Cv two ends electricity
Pressure is more than 7.5 volts, and constant-current driven chip U2 starts work；
Described self-powered circuit, after starting at constant-current driven chip U1 or constant-current driven chip U2, it is provided that constant-current driven chip
U1 or the running voltage of constant-current driven chip U2；This self-powered circuit includes: the Same Name of Ends of vice-side winding NV1 is through current-limiting resistance R13
Connecting the positive pole of diode D13, the negative pole of diode D13 connects the negative pole of diode D14, and the positive pole of diode D14 is through current limliting electricity
Resistance R14 connect vice-side winding NV2 different name end, 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 is simultaneously connected with between diode D13 and diode D14, the other end of energy storage capacitor Cv, vice-side winding
The GND of the different name end of NV1, the Same Name of Ends of vice-side winding NV2, the GND pin of constant-current driven chip U1 and constant-current driven chip U2 draws
Foot is all connected with public zero potential OV.
The constant-current control circuit of described constant-current driven chip U1 and constant-current driven chip U2 includes: the sensing of vice-side winding NV1 output
Voltage feeds back to the FB pin of constant-current driven chip U1, the sense of vice-side winding NV2 output through the dividing potential drop of resistance R11 and resistance r11
Voltage is answered to feed back to the FB pin of constant-current driven chip U2 through the dividing potential drop of resistance R12 Yu resistance r12；One end of sampling resistor RCS
Being simultaneously connected with the CS pin of constant-current driven chip U1 and the CS pin of constant-current driven chip U2, the other end connects public zero potential OV.
Described coupling output circuit includes: one end of center pillar secondary windings N2 is simultaneously connected with one end and the energy storage electricity of energy storage capacitor C01
Holding one end of C02, the other end of center pillar secondary windings N2 is simultaneously connected with the positive pole of commutation diode D01 and commutation diode D02
Negative pole, the other end of energy storage capacitor C01 and the negative pole of commutation diode D01 are all connected with the positive terminal of load LED lamp, energy storage capacitor
The other end of C02 and the positive pole of commutation diode D02 are all connected with the negative pole end of load LED lamp；Load LED lamp two ends the most in parallel
RC parallel filtering circuit；By designing the number of turn of center pillar secondary windings N2, the load LED lamp of adaptive each electric pressure.
Described ripple presses down ordinary telegram road and includes: one end of additional winding N31 is simultaneously connected with diode D311's after tuning coil L31
Positive pole and the negative pole of diode D312, the other end connects one end of additional winding N32 and is simultaneously connected with at energy storage capacitor C01 and energy storage
Between electric capacity C02, the other end of additional winding N32 is simultaneously connected with positive pole and two poles of diode D321 after tuning coil L32
The negative pole of pipe D322, the negative pole of diode D311 and the negative pole of diode D321 are all connected with the positive terminal of load LED lamp, diode
The positive pole of 312 and the positive pole of diode D322 are all connected with the negative pole end of load LED lamp.
The remarkable advantage of the present invention is:
1, the Polarity Control two panels DU8966 collection of the half-wave period of positive half-wave or negative half-wave after utilizing input ac power zero passage
Become chip alternation or half ripple high-frequency PWM current constant control main circuit current of having a rest, by low-voltage and high-current MOSFET pipe source
Pole drives and controls the big current flowing loop of high-voltage large-current electronic switch conducting formation, replaces rectifier bridge to realize no bridge type rectification,
Directly produce the AC-AC mode of operation of high-frequency RF, improve power factor PF value, effectively promote the electric work efficiency of alternating current power supply,
Reduce cost.
2, without electrochemical capacitor, LED constant current power supply reliability is promoted.
3, using integrated magnetic, two side columns at common three post magnetic cores arrange armature winding N11 and N12；Center pillar secondary windings
N2 is arranged in magnetic core center pillar, arranges additional winding N31 and N32 at two side column edges, makes full use of winding leakage inductance and just also assists in
The work of energy.Primary side winding N11 and N12 are activated electric capacity Cj1 and Cj2 and safety electric capacity Cx and constitute LC closed-loop path, work as exchange
Power supply Uin zero passage, or " dead band period " moment of internal power electrical switch, this recovery stray EM field, LC closed-loop path is former
This harmful harmonic wave negative energy, is converted into center pillar secondary windings N2, the positive energy of additional winding N31 and N32, feeds back to load
LED, had both promoted electric work power, had reduced again THD and EMI.
4, because of without electrochemical capacitor, for the high ripple problem without filtering, the present invention utilizes side column magnetic flux and center pillar resultant flux
Between there is phase contrast effect, additional winding N31 and N32 is set at two side column edges, and seals in inductance L31, inductance respectively
L32, respectively constitutes " series resonant tank " with electric capacity C01 and with electric capacity C02, be tuned at respectively supply harmonic THD exists humorous
Two frequencies that wave energy is bigger, then the most harmful harmonic alternating current energy, turn harm into good, and reclaim and are converted into DC current
Source, powers to filter capacitor C0, plays the effect pressing down flat LED current ripple, so, it is not necessary to the electrochemical capacitor of high capacitance
Make filter capacitor, it is possible to realize LED low ripple, both avoid the integrity problem using electrochemical capacitor to cause, it also avoid
Electrolyte pollution, it is achieved circuit environmental protection, improves reliability and the working life of constant current source；
5, in the big current flowing loop of ac power circuit, big electric current no longer flows through the integrated core of DU8966 as prior art
The MOSFET pipe that sheet is built-in, can reduce chip operating temperature, improve its service life；
6, DU8966 chip drives high-voltage large-current electronic switch, low electricity by the output of low-voltage and high-current MOSFET pipe source electrode
Big current MOS FET pipe is pressed to play current expanding function, it is achieved small-power chip DU8966 drives the mesh of high-voltage large-current electronic switch
, thus realize DU8966 chip small-power within 45 watts and control to apply to hectowatt grade high-powered LED lamp power supply；
7, play DU8966 High Power Factor, adapt to wide power, the wide load voltage of adaptation, the adaptation wider tolerance of energy storage inductance
But still have that constant current accuracy is high, current ripples is little, LED does not flashes, the advantage of low cost；
8, with the capacitive reactance of start-up capacitance Cj1 and Cj2 as not consuming the startup scheme of active power, traditional resistance blood pressure lowering is replaced
Startup scheme.
9, the public zero potential in circuit is unsettled, it is achieved isoelectric level, can reduce the impact of thunder and lightning.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the present invention.
Detailed description of the invention
Below in conjunction with Fig. 1, the detailed description of the invention of the present invention is further described.
As it is shown in figure 1, without bridge no electrolytic capacitor low ripple high-powered LED lamp constant current source, including: ac power circuit, control
Circuit, coupling output circuit and ripple press down ordinary telegram road；
The constant current source of the present invention uses magnetic integrated transformer TR, including " day " shaped magnetic core post, and, primary side winding N11
It is wound on being respectively symmetrically on two side columns of " day " shaped magnetic core post with primary side winding N12, vice-side winding NV1 and vice-side winding
NV2 is wound on two side columns of " day " shaped magnetic core post with being respectively symmetrically, and center pillar secondary windings N2 is wound on " day " shaped magnetic core
On the center pillar of post, additional winding N31 and additional winding N32 is wound on two side columns of " day " shaped magnetic core post with being respectively symmetrically.
Described ac power circuit connects alternating current power supply Uin, including being controlled by alternating current power supply Uin positive half-wave and negative half-wave polarity
Control alternation or the constant-current driven chip U1 of half ripple of having a rest and high-voltage large-current electronic switch T1, constant-current driven chip U2
With high-voltage large-current electronic switch T2, and, by constant-current driven chip U1 and constant-current driven chip U2 respectively control conducting friendship
Half-wave current loop born by stream electricity positive half-wave current loop and alternating current, and the electric current of above-mentioned current loop all flows through magnetic integrated transformer TR
Primary side winding N11 and primary side winding N12, produce respectively with the vice-side winding NV1 and vice-side winding NV2 at magnetic integrated transformer TR
Induced voltage, produces sensing secondary current at the center pillar secondary windings N2 of magnetic integrated transformer TR；Constant-current driven chip U1 and constant current
The integrated chip that driving chip U2 all uses model to be DU8966.
Described alternating current positive half-wave current loop is: at alternating current positive half-wave, electric current is from the positive polarity L end stream of alternating current power supply Uin
Go out, flow through fuse wire F, the different name end of primary side winding N11 and Same Name of Ends, the collection of high-voltage large-current electronic switch T1 successively
Electrode and emitter stage, public zero potential OV, diode D2, the different name end of primary side winding N12 and Same Name of Ends, return to alternating current power supply
The negative polarity N end of Uin；Being controlled by this alternating current positive half-wave, constant-current driven chip U1 works, and constant-current driven chip U2 does not works；
Half-wave current loop born by described alternating current: bear half-wave at alternating current, and electric current is from the negative polarity N end stream of alternating current power supply Uin
Go out, flow through Same Name of Ends and different name end, the colelctor electrode of high-voltage large-current electronic switch T2 and the transmitting of primary side winding N12 successively
Pole, public zero potential OV, diode D1, the Same Name of Ends of primary side winding N11 and different name end, fuse wire F, return to alternating current
The positive polarity L end of source Uin；Being controlled by this alternating current and bear half-wave, constant-current driven chip U2 works, constant-current driven chip U1 not work
Make.
Described control circuit includes that the turn-on control circuit in half-wave current loop born by alternating current positive half-wave current loop and alternating current, permanent
Stream driving chip U1 and the start-up circuit of 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 loop includes: one end of start-up capacitance Cj1 connects primary side winding N11
Same Name of Ends, the other end connect diode D6 positive pole, the negative pole of diode D6 is simultaneously connected with constant-current driven chip U1 through resistance R6
Vgs pin, one end of electric capacity of voltage regulation C71, the grid of low-voltage and high-current MOSFET pipe T51 and drain electrode, electric capacity of voltage regulation C71's
The other end connects public zero potential OV；The source electrode of low-voltage and high-current MOSFET pipe T51 is simultaneously connected with high-voltage large current electronic cutting
Closing grid and one end of resistance R51 of T1, the other end of resistance R51 connects the DRN pin of constant-current driven chip U1；Ignore low electricity
Press conducting internal resistance rcs (on) of big current MOS FET pipe T51, be equivalent to the voltage at electric capacity of voltage regulation C71 two ends and be positive 15 volts and directly drive height
Voltage high-current electrical switch T1 turns on, and alternating current positive half-wave current loop turns on；
Described alternating current is born the turn-on control circuit in half-wave current loop and is included: one end of start-up capacitance Cj2 connects primary side winding N12
Different name end, the other end connect diode D6 positive pole, the negative pole of diode D6 is simultaneously connected with constant-current driven chip U2 through resistance R6
Vgs pin, one end of electric capacity of voltage regulation C72, the grid of low-voltage and high-current MOSFET pipe T52 and drain electrode, electric capacity of voltage regulation C72's
The other end connects public zero potential OV, and the source electrode of low-voltage and high-current MOSFET pipe T52 is simultaneously connected with high-voltage large current electronic cutting
Closing grid and one end of resistance R52 of T2, the other end of R52 connects the DRN pin of constant-current driven chip U2；Ignore low-voltage big
Conducting internal resistance rcs (on) of current MOS FET pipe T52, is equivalent to the voltage at electric capacity of voltage regulation C72 two ends and is positive 15 volts and directly drives high voltage
Heavy-current electronic switch T2 turns on, and the conducting of half-wave current loop born by alternating current.
The start-up circuit of described constant-current driven chip U1 includes: at alternating current positive half-wave, electric current is from positive polarity L of alternating current power supply Uin
End flows out, and flows through fuse wire F, the different name end of primary side winding N11 and Same Name of Ends, start-up capacitance Cj1, energy storage capacitor successively
Cv, public zero potential OV, diode D2, the different name end of primary side winding N12 and Same Name of Ends, return to the negative polarity of alternating current power supply Uin
N end；The VCC pin of constant-current driven chip U1 is connected between start-up capacitance Cj1 and energy storage capacitor Cv, when energy storage capacitor Cv two ends
Voltage is more than 7.5 volts, and constant-current driven chip U1 starts work；
The start-up circuit of described constant-current driven chip U2 includes: bear half-wave at alternating current, and electric current is from negative polarity N of alternating current power supply Uin
End flows out, and flows through Same Name of Ends and different name end, start-up capacitance Cj2, energy storage capacitor Cv, the public zero potential of primary side winding N12 successively
OV, diode D1, the Same Name of Ends different name end of primary side winding N11, fuse wire F, return to positive polarity L of alternating current power supply Uin
End；The VCC pin of constant-current driven chip U2 is connected between start-up capacitance Cj2 and energy storage capacitor Cv, when energy storage capacitor Cv two ends electricity
Pressure is more than 7.5 volts, and constant-current driven chip U2 starts work；
Described self-powered circuit, after starting at constant-current driven chip U1 or constant-current driven chip U2, it is provided that constant-current driven chip
U1 or the running voltage of constant-current driven chip U2；This self-powered circuit includes: the Same Name of Ends of vice-side winding NV1 is through current-limiting resistance R13
Connecting the positive pole of diode D13, the negative pole of diode D13 connects the negative pole of diode D14, and the positive pole of diode D14 is through current limliting electricity
Resistance R14 connect vice-side winding NV2 different name end, 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 is simultaneously connected with between diode D13 and diode D14, the other end of energy storage capacitor Cv, vice-side winding
The GND of the different name end of NV1, the Same Name of Ends of vice-side winding NV2, the GND pin of constant-current driven chip U1 and constant-current driven chip U2 draws
Foot is all connected with public zero potential OV.
The constant-current control circuit of described constant-current driven chip U1 and constant-current driven chip U2 includes: the sensing of vice-side winding NV1 output
Voltage feeds back to the FB pin of constant-current driven chip U1, the sense of vice-side winding NV2 output through the dividing potential drop of resistance R11 and resistance r11
Voltage is answered to feed back to the FB pin of constant-current driven chip U2 through the dividing potential drop of resistance R12 Yu resistance r12；One end of sampling resistor RCS
Being simultaneously connected with the CS pin of constant-current driven chip U1 and the CS pin of constant-current driven chip U2, the other end connects public zero potential OV.
At the series arm two ends of alternating current power supply Uin series connection fuse wire F varistor Rv and safety electric capacity Cx in parallel also respectively,
In order to protection circuit；The protection diode DZ1 of 15V is connected between the emitter stage and grid of high-voltage large-current electronic switch T1,
The protection diode DZ2 of 15V is connected between the emitter stage and grid of high-voltage large-current electronic switch T2.
Described coupling output circuit includes: one end of center pillar secondary windings N2 is simultaneously connected with one end and the energy storage electricity of energy storage capacitor C01
Holding one end of C02, the other end of center pillar secondary windings N2 is simultaneously connected with the positive pole of commutation diode D01 and commutation diode D02
Negative pole, the other end of energy storage capacitor C01 and the negative pole of commutation diode D01 are all connected with the positive terminal of load LED lamp, energy storage capacitor
The other end of C02 and the positive pole of commutation diode D02 are all connected with the negative pole end of load LED lamp；Load LED lamp two ends the most in parallel
RC parallel filtering circuit.RC parallel filtering circuit includes the filter capacitor C0 and resistance R0 of parallel connection.By design center pillar secondary windings
The number of turn of N2, the load LED lamp of the most each adaptive electric pressure.
Described ripple presses down ordinary telegram road and includes: one end of additional winding N31 is simultaneously connected with diode D311's after tuning coil L31
Positive pole and the negative pole of diode D312, the other end connects one end of additional winding N32 and is simultaneously connected with at energy storage capacitor C01 and energy storage
Between electric capacity C02, the other end of additional winding N32 is simultaneously connected with positive pole and two poles of diode D321 after tuning coil L32
The negative pole of pipe D322, the negative pole of diode D311 and the negative pole of diode D321 are all connected with the positive terminal of load LED lamp, diode
The positive pole of 312 and the positive pole of diode D322 are all connected with the negative pole end of load LED lamp.
The operation principle of the turn-on control circuit of described alternating current positive half-wave current loop is: owing to the capacitive reactance of start-up capacitance Cj1 limits
Stream, the Vgs pin powered to constant-current driven chip U1, play built-in 15 volts of this Vgs pin, the effect of stabilivolt of 8 milliamperes,
Electric capacity of voltage regulation C71 two ends are made to have positive 15 ± 1 volts of burning voltage.DRN pin and CS pin inner portions pair as constant-current driven chip U1
Logical, it is 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 manages
T51 turns on, be equivalent to the Vgs pin voltage stabilizing 15 of the gate turn-on constant-current driven chip U1 of high-voltage large-current electronic switch T1 ±
1 volt, then high-voltage large-current electronic switch T1 conducting, there is alternating current positive half-wave current loop described in big current flowing, and should
Big electric current is no longer flow through the built-in metal-oxide-semiconductor of constant-current driven chip U1, and constant-current driven chip U1 reduces heating.Half-wave electricity born by alternating current
Flow back to the operation principle of turn-on control circuit on road ibid.Thus, it is achieved that " without bridge " work of no bridge type rectification, directly real
The alternating current power supply of existing low frequency AF transfers the AC-AC work that constant-current driven chip U1 controls the high-frequency RF of high-voltage large-current electronic switch T1 to
Operation mode, has saved bridge rectifier, reduces cost, improves electric work efficiency.
For the industrial power of 50 hertz, every half ripple of alternating current accounts for 10 milliseconds.At alternating current positive half-wave, work as energy storage capacitor
Cv both end voltage is more than 7.5 volts, and constant-current driven chip U1 starts work；Above-mentioned 10 milliseconds of positive half-wave periods, diode D2 leads
Logical, make the rest 10 milliseconds that do not works out of control of high-voltage large-current electronic switch T2；After constant-current driven chip U1 starts work, by
Self-powered circuit provides running voltage to constant-current driven chip U1, when power supply electric capacity Cv two ends electricity end is between 7.5 to 27 volts, permanent
Stream driving chip U1 normally works；When power supply electric capacity Cv two ends electricity end is less 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, half-wave, diode are born at alternating current
D1 turns on, and the rest 10 milliseconds that do not works out of control of high-voltage large-current electronic switch T1, constant-current driven chip U2 operation principle is ibid.
When the alternating current zero passage of alternating current power supply Uin input, the power supply electric capacity Cv both end voltage time more than 7.5 volts is more than 10ms,
Then constant-current driven chip U1 and constant-current driven chip U2 all works, but now AC-less power energy input, it is referred to as 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 works, and the exchange of 50 He Zhi is changed into 20 kilo hertzs of sesame superaudio pulses, the at this moment integrated transformations of magnetic
The side column magnetic flux of device TR flows to center pillar from right to left, and center pillar magnetic flux flows from left to right；Otherwise, when bearing half-wave 10 at alternating current
The millisecond period, constant-current driven chip U2 drives the work of high-voltage large-current electronic switch T2, and the alternating current of 50 He Zhi is changed into 20,000
He Zhi superaudio pulse, 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；Two-way flow
Magnetic flux cutting center pillar secondary windings N2, produces sensing secondary current ILED, and rectified diode D01 and commutation diode D02 is whole
Stream, becomes DC current and is stored in energy storage capacitor C01 and energy storage capacitor C02, simultaneously to the filter capacitor C0 of RC parallel filtering circuit
Charging is also powered to load LED lamp.Due to commutation diode D01 and commutation diode D02, with energy storage capacitor C01 and energy storage capacitor
It is combined into " times voltage commutation " between C02, there is automatic frequency multiplication effect, so, the filter capacitor of RC parallel filtering circuit
CO is required for the electrochemical capacitor of high capacitance, it is possible to obtain relatively low ripple；Be better than common tradition inverse-excitation type halfwave rectifier to
LED powers and bigger ripple occurs.
At alternating current positive half-wave, no matter whether constant-current driven chip U1 works, when sampling resistor RCS two ends pressure drop reaches 1.2 volts,
This pulse ends；The FB pin detection inductive current of constant-current driven chip U1 is zero, when meeting " the lowest point switch " principle, and constant current
Driving chip U1 just exports next pulse enabling signal, it is achieved the fine regulation and control of pulse duty factor one by one, it is achieved 3% constant current essence
Degree.In like manner, bearing half-wave at alternating current, constant-current driven chip U2 also realizes the fine regulation and control of pulse duty factor one by one, it is achieved 3% is permanent
Stream precision.
Load LED lamp in terms of C-V characteristic, its essence is that a string dog days' Zener diode is connected, so, DC current source must be used
Constant current is powered to load LED lamp, is different from traditional powering with direct voltage source voltage stabilizing to load LED lamp, hence it is evident that improve load
The reliability of LED work.
Owing to alternating current power supply itself exists harmonic wave, more control respectively due to constant-current driven chip U1 and constant-current driven chip U2 alternation
High-voltage large-current electronic switch T1 processed and the HF switch with high-voltage large-current electronic switch T2 run, and add magnetic characteristic
B=f (H) curve non-linear, certainly exists THD harmonic wave, and these THD harmonic waves and EMI interference belong to the negative energy being harmful to；For
This, reclaimed these negative energies by additional winding N31 and additional winding N32, respectively by diode D311, diode D312, two poles
Pipe D321 and diode D322 is converted into DC current source positive energy the negative energy reclaimed, to filter capacitor C0 charging simultaneously to negative
Load LED is powered, and presses down the current ripples of flat load LED lamp, so being required for electrochemical capacitor also have low ripple, improves sexual valence
Ratio.
Tuning coil L31 can also be increased further between one end and the positive pole of diode D311 of additional winding N31, with
And between one end and the positive pole of diode D321 of additional winding N32, increase tuning coil L32, energy among tuning THD harmonic wave
The harmonic frequency relatively concentrated, makes the above-mentioned effect turned harm into good more effective.
Preferably less than voltage high-current MOSFET pipe T51 and low-voltage and high-current MOSFET pipe T52 be about 20V low-voltage MOSFET,
The high sensitivity of Ugs4.5v saturation conduction, big electric current are about the MOSFET pipe of 5 peaces to 20 peaces, and price is the cheapest.Due to low-voltage
Big current MOS FET pipe T51 and low-voltage and high-current MOSFET pipe T52 is operated in source electrode output services situation, and its output impedance is very
Low, it is possible to high efficiency controls high-voltage large-current electronic switch T1 and high-voltage large-current electronic switch T2 the most respectively.This reality
The MOSFET pipe that the low-voltage and high-current MOSFET pipe T51 and low-voltage and high-current MOSFET pipe T52 executing example uses 20 volt 10 to pacify
10N02, high-voltage large-current electronic switch T1 and high-voltage large-current electronic switch T2 use the IGBT24N65 of 650 volts of 24A, surely
Voltage capacitance C71 and C72 are 105/25V electric capacity, the constant current source of the present invention can be made to have by the value of flexible design sampling resistor RCS
Below 1000W output, then, the constant current source of the present invention can make the integrated chip of DU8966 from less than only 45 watts small-powers
Driving force, expand to more than hundreds of watts high-power driving abilities, the significant increase cost performance of constant current source, meets big merit
The rate LED demand to high-power constant current source.
Claims (7)
1. without bridge no electrolytic capacitor low ripple high-powered LED lamp constant current source, it is characterised in that including: ac power circuit, control circuit, coupling output circuit and ripple press down ordinary telegram road；
Described ac power circuit connects alternating current power supply Uin, including being controlled by alternating current power supply Uin positive half-wave and negative half-wave Polarity Control alternation or the constant-current driven chip U1 of half ripple of having a rest and high-voltage large-current electronic switch T1, constant-current driven chip U2 and high-voltage large-current electronic switch T2, and, half-wave current loop born by the alternating current positive half-wave current loop and the alternating current that are controlled conducting by constant-current driven chip U1 and constant-current driven chip U2 respectively, the electric current of above-mentioned current loop all flows through primary side winding N11 and primary side winding N12 of magnetic integrated transformer TR, induced voltage is produced respectively with the vice-side winding NV1 and vice-side winding NV2 at magnetic integrated transformer TR, sensing secondary current is produced at the center pillar secondary windings N2 of magnetic integrated transformer TR；
Described control circuit includes that alternating current positive half-wave current loop and alternating current bear the turn-on control circuit in half-wave current loop, constant-current driven chip U1 and the start-up circuit of constant-current driven chip U2, self-powered circuit and constant-current control circuit；
The sensing secondary current that described coupling output circuit produces above-mentioned center pillar secondary windings N2 is rectified, after filtering output to load LED lamp；
Described ripple presses down ordinary telegram road for reclaiming the harmonic wave THD and electromagnetic interference EMI produced in alternating current power supply and ac power circuit, rectified after output to load LED lamp；
The integrated chip that described constant-current driven chip U1 and constant-current driven chip U2 all uses model to be DU8966.
The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge the most according to claim 1, it is characterized in that, described magnetic integrated transformer TR includes " day " shaped magnetic core post, and, primary side winding N11 and primary side winding N12 are wound on two side columns of " day " shaped magnetic core post with being respectively symmetrically, vice-side winding NV1 and vice-side winding NV2 is wound on two side columns of " day " shaped magnetic core post with being respectively symmetrically, center pillar secondary windings N2 is wound on the center pillar of " day " shaped magnetic core post, additional winding N31 and additional winding N32 is wound on two side columns of " day " shaped magnetic core post with being respectively symmetrically.
The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge the most according to claim 1, it is characterized in that, described alternating current positive half-wave current loop is: at alternating current positive half-wave, electric current flows out from the positive polarity L end of alternating current power supply Uin, flow through fuse wire F, the different name end of primary side 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 primary side winding N12 and Same Name of Ends successively, return to the negative polarity N end of alternating current power supply Uin；Being controlled by this alternating current positive half-wave, constant-current driven chip U1 works, and constant-current driven chip U2 does not works；
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 alternating current power supply Uin, flow through Same Name of Ends 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 primary side winding N11 and different name end, the fuse wire F of primary side winding N12 successively, return to the positive polarity L end of alternating current power supply Uin；Being controlled by this alternating current and bear half-wave, constant-current driven chip U2 works, and constant-current driven chip U1 does not works；
Described high-voltage large-current electronic switch T1 and high-voltage large-current electronic switch T2 all use the IGBT24N65 of 650 volts of 24A.
The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge the most according to claim 1, it is characterized in that, the turn-on control circuit of described alternating current positive half-wave current loop includes: one end of start-up capacitance Cj1 connects the Same Name of Ends of primary side winding N11, the other end connects the positive pole of diode D6, the negative pole of diode D6 is simultaneously connected with 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, 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 is simultaneously connected with grid and one end of resistance R51 of high-voltage large-current electronic switch T1, 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 turns on, and alternating current positive half-wave current loop turns on；
Described alternating current is born the turn-on control circuit in half-wave current loop and is included: one end of start-up capacitance Cj2 connects the different name end of primary side winding N12, the other end connects the positive pole of diode D6, the negative pole of diode D6 is simultaneously connected with the Vgs pin of constant-current driven chip U2 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 is simultaneously connected with grid and one end of resistance R52 of high-voltage large-current electronic switch T2, 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 turns on, and the conducting of half-wave current loop born by alternating current；
Described high-voltage large-current electronic switch T1 and high-voltage large-current electronic switch T2 all use the IGBT24N65 of 650 volts of 24A.
The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge the most according to claim 1, it is characterized in that, the start-up circuit of described constant-current driven chip U1 includes: at alternating current positive half-wave, electric current flows out from the positive polarity L end of alternating current power supply Uin, flow through fuse wire F, the different name end of primary side 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 primary side winding N12 and Same Name of Ends successively, return to the negative polarity N end of alternating current power supply Uin；The VCC pin of constant-current driven chip U1 is connected between start-up capacitance Cj1 and energy storage capacitor Cv, when energy storage capacitor Cv both end voltage is more than 7.5 volts, and constant-current driven chip U1 starts work；
The start-up circuit of described constant-current driven chip U2 includes: bear half-wave at alternating current, electric current flows out from the negative polarity N end of alternating current power supply Uin, flows through the Same Name of Ends of primary side 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 primary side winding N11, fuse wire F successively, returns to the positive polarity L end of alternating current power supply Uin；The VCC pin of constant-current driven chip U2 is connected between start-up capacitance Cj2 and energy storage capacitor Cv, when energy storage capacitor Cv both end voltage is more than 7.5 volts, and constant-current driven chip U2 starts work；
Described self-powered circuit, after starting at constant-current driven chip U1 or constant-current driven chip U2, it is provided that constant-current driven chip U1 or the running voltage of constant-current driven chip U2；This self-powered circuit includes: 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 simultaneously connected with between diode D13 and diode D14, 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 and the GND pin of constant-current driven chip U2 are all connected with public zero potential OV.
The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge the most according to claim 1, it is characterized in that, the constant-current control circuit of described constant-current driven chip U1 and constant-current driven chip U2 includes: the induced voltage of vice-side winding NV1 output 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 of vice-side winding NV2 output feeds back to the FB pin of constant-current driven chip U2 through the dividing potential drop of resistance R12 Yu resistance r12；One end of sampling resistor RCS is simultaneously connected with the CS pin of constant-current driven chip U1 and the CS pin of constant-current driven chip U2, and the other end connects public zero potential OV.
The low ripple high-powered LED lamp constant current source of no electrolytic capacitor without bridge the most according to claim 1, it is characterized in that, described coupling output circuit includes: one end of center pillar secondary windings N2 is simultaneously connected with one end and one end of energy storage capacitor C02 of energy storage capacitor C01, the other end of center pillar secondary windings N2 is simultaneously connected with positive pole and the negative pole of commutation diode D02 of commutation diode D01, the other end of energy storage capacitor C01 and the negative pole of commutation diode D01 are all connected with the positive terminal of load LED lamp, the other end of energy storage capacitor C02 and the positive pole of commutation diode D02 are all connected with the negative pole end of load LED lamp；Load LED lamp two ends RC parallel filtering circuit also in parallel；By designing the number of turn of center pillar secondary windings N2, the load LED lamp of adaptive each electric pressure.
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| CN105050262A (en) * | 2015-07-13 | 2015-11-11 | 南宁常萌电子科技有限公司 | All-solid-state low-ripple LED lamp intelligent numerical control power supply |
| CN104980014A (en) * | 2015-07-13 | 2015-10-14 | 南宁常萌电子科技有限公司 | APFC method of boost with no DC bias and no electrolytic capacitor |
| CN107124107B (en) * | 2017-05-05 | 2019-02-05 | 广西高焱电气工程有限责任公司 | No electrolytic capacitor separate AC-AC power supplies |
| CN111066376B (en) * | 2017-09-16 | 2022-12-23 | 凤凰电机公司 | Light source device, exposure device, and method for determining light source device |
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| CN101282606B (en) * | 2008-05-05 | 2012-10-03 | 深圳唐微科技发展有限公司 | Control method for power adapter of LED lamp without electrolysis capacitor |
| CN101488705A (en) * | 2009-02-18 | 2009-07-22 | 南宁常萌电子科技有限公司 | A soft-switching process |
| US8581517B2 (en) * | 2009-09-17 | 2013-11-12 | O2 Micro, Inc | Systems and methods for driving a light source |
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| US20140117878A1 (en) * | 2012-05-15 | 2014-05-01 | Exar Corporation | Merged-stage high efficiency high power factor hb-led driver without electrolytic capacitor |
| CN202857064U (en) * | 2012-09-27 | 2013-04-03 | 杭州鸿德照明科技有限公司 | Novel wide-input-voltage LED non-isolated single-chip constant-current drive circuit |
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