CN105992438A - LED silicon controlled rectifier dimming driving circuit - Google Patents
LED silicon controlled rectifier dimming driving circuit Download PDFInfo
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- CN105992438A CN105992438A CN201510086359.XA CN201510086359A CN105992438A CN 105992438 A CN105992438 A CN 105992438A CN 201510086359 A CN201510086359 A CN 201510086359A CN 105992438 A CN105992438 A CN 105992438A
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Abstract
The invention relates to an LED silicon controlled rectifier dimming driving circuit. After a silicon controlled rectifier dimmer is connected with an alternating current power source, two ends of the silicon controlled rectifier dimmer are connected with a rectifier. The LED silicon controlled rectifier dimming driving circuit comprises a high-frequency switch transformer, an SSL2101T chip, a resistance voltage dividing sampling circuit, a current-limiting resistor, a bleeder resistor, an oscillation circuit, and an RCD clamp circuit. According to the LED silicon controlled rectifier dimming driving circuit, the externally-connected silicon controlled rectifier dimmer is adopted, so that an output current variation range is 0-347.7 mA, current variation is approximate to a logarithmic curve, and a light dimming process is free of flicker. The circuit has a good dimming effect; the overall conversion efficiency of the circuit in full load is 73%; and the power factor of the circuit is 0.762. Thus, the circuit has the advantages of simple structure, low cost, high efficiency, good power factor and the like, and can support a conventional silicon controlled rectifier dimmer and is suitable for being used as a replacement type miniwatt LED driver.
Description
Technical field
The present invention relates to a kind of LED drive circuit, particularly to a kind of LED thyristor regulating optical drive
Circuit.
Background technology
Controllable silicon dimmer, starts most to be applied to electric filament lamp light modulation, can be convenient by light-control knob
Ground controls to give the energy of bulb, thus regulates the brightness of electric filament lamp.Controllable silicon dimmer has huge
Big energy-saving benefit.
At present, electric filament lamp is more and more replaced for energy-saving LED lamp.How to use thyristor regulating
The light modulation of light device compatible with LED drives, and playing bigger energy-saving effect becomes the problem needing to solve.
Summary of the invention
A kind of LED thyristor regulating light drive circuit of the offer of the present invention, to overcome above-mentioned existing skill
The defect of art.
The present invention provides a kind of LED thyristor regulating light drive circuit, controllable silicon dimmer and alternating current
After source is connected, two ends are connected with commutator U1；High frequency switch transformer T1, has: in side
A winding, b winding, the c winding of opposite side；SSL2101T chip has BRIGHTNESS
End, PWMLIMIT end, RC end, RC2 end, ISENSE end, SOURCE end, VCC end, AUX
End, DRAIN end, SBLEED end, WBLEED end and GND end；Current-limiting resistance 20 first end with
BRIGHTNESS end is connected, and the second end is connected with PWMLIMIT end, and the 3rd end is adopted with electric resistance partial pressure
Sample circuit 10 is connected；Oscillating circuit 40 first end is connected with RC end, and the second end is connected with RC2 end,
3rd end ground connection；GND end ground connection；13rd resistance R13 one end is connected with ISENSE end, another
End ground connection；14th resistance R14 one end is connected with the negative pole of rectifier bridge U1, other end ground connection；The
12 resistance R12 one end are connected with ISENSE end, and the other end is connected with the negative pole of rectifier bridge U1；The
15 resistance R15 one end are connected with SOURCE end, other end ground connection；6th electric capacity C6 one end with
VCC end is connected, other end ground connection；Second diode VR2 negative pole is connected with VCC end, the other end
Ground connection；11st resistance R11 one end is connected with AUX end, and the other end and the 6th diode D6 are just
The most connected；Tenth resistance R10 one end is connected with the negative pole of the 6th diode D6, the other end and VCC
End is connected；B winding one end is connected with the positive pole of the 6th diode D6, other end ground connection；RCD clamps
Position circuit 50 first end is connected with DRAIN end, and the second end and the 4th diode D4 negative pole are connected；c
Winding one end is connected with RCD clamp circuit 50 second end, and the other end is connected with DRAIN end；4th
The positive pole of diode D4 is connected with the positive pole of rectifier bridge U1；Bleeder resistance 30 first end and SBLEED
End is connected, and the second end is connected with WBLEED, and the 3rd end is connected with rectifier bridge U1 positive pole；Resistance divides
Pressure sample circuit 10 first end is connected with rectifier bridge U1 positive pole, and the second end is connected with current-limiting resistance 20,
3rd end ground connection；One end of first electric capacity C1 is connected with rectifier bridge U1 positive pole, other end ground connection；c
One end of winding is connected with the positive pole of the 7th diode D7, the other end and light-emitting diode group LED
Negative pole be connected and ground connection；The positive pole of light-emitting diode group LED and the 7th diode D7 negative pole are connected；
7th electric capacity C7, one end of the 8th electric capacity C8 are all connected with the positive pole of light-emitting diode group LED,
The other end all ground connection.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: also include the output overvoltage protection circuit 60 with optocoupler U2；16th resistance R16
One end is connected with first end of optocoupler U2, and the other end is connected with light-emitting diode group LED positive pole；Light
Second end of coupling U2 is connected with the negative pole of controllable accurate source of stable pressure, the 3rd end ground connection, the 4th end with
PWMLIMIT end is connected；The plus earth of controllable accurate source of stable pressure；18th resistance R18 one end
Being connected with first end of optocoupler U2, the other end is connected with second end of optocoupler U2；17th resistance
R17 one end is connected with the positive pole of light-emitting diode group LED, the other end and controllable accurate source of stable pressure
With reference to the most connected；9th electric capacity C9 one end is extremely connected with the reference of controllable accurate source of stable pressure, the other end
It is connected with second end of optocoupler U2；19th resistance R19 one end and the reference of controllable accurate source of stable pressure
The most connected, other end ground connection；Tenth electric capacity C10 one end is connected with the positive pole of controllable accurate source of stable pressure,
Other end ground connection.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: electric resistance partial pressure sample circuit 10 includes the first resistance R1, the second resistance R2 and the 3rd
Electric capacity C3；One end of first resistance is the first end and the rectifier bridge of electric resistance partial pressure sample circuit 10
U1 positive pole is connected；The other end is the second end of electric resistance partial pressure sample circuit 10, with current-limiting resistance 20
It is connected；Second resistance R2 one end is all the second end of electric resistance partial pressure sample circuit 10, with current limliting electricity
Resistance 20 is connected；The other end is electric resistance partial pressure sample circuit 10 the 3rd end, ground connection；3rd electric capacity C3
One end is all the second end of electric resistance partial pressure sample circuit 10, is connected with current-limiting resistance 20；The other end
It is all electric resistance partial pressure sample circuit 10 the 3rd end, ground connection.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: current-limiting resistance 20 includes the 6th resistance R6 and the 7th resistance R7；6th resistance R6
The first end that one end is current-limiting resistance 20, be connected with BRIGHTNESS end；The other end is current limliting
3rd end of resistance 20, is connected with electric resistance partial pressure sample circuit 10；One end of 7th resistance R7 is
Second end of current-limiting resistance 20, is connected with PWMLIMIT end；The other end is all current-limiting resistance 20
The 3rd end, be connected with electric resistance partial pressure sample circuit 10.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: bleeder resistance 30 includes the 3rd resistance R3 and the 4th resistance R4；3rd resistance R3
The second end that one end is bleeder resistance 30, be connected with WBLEED end；The other end is bleeder resistance
3rd end of 30, is connected with the positive pole of rectifier bridge U1；One end of 4th resistance R4 is bleeder resistance
First end of 30, is connected with SBLEED end；The other end is all the 3rd end of bleeder resistance 30, with
The positive pole of rectifier bridge U1 is connected.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: oscillating circuit 40 includes the 5th resistance R5, the 8th resistance R8 and the 4th electric capacity C4；
5th resistance R5 one end is the first end of oscillating circuit 40, is connected with RC end；The other end is vibration
3rd end of circuit 40, ground connection；8th resistance R8 one end is all the first end of oscillating circuit 40,
It is connected with RC end；The other end is the second end of oscillating circuit 40, is connected with RC2 end；4th electricity
Hold C4 one end and be all the first end of oscillating circuit 40, be connected with RC end；The other end is all vibration electricity
3rd end on road 40, ground connection.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: RCD clamp circuit 50 includes the 5th diode D5, the 5th electric capacity C5 and the 9th electricity
Resistance R9；Second end that one end is RCD clamp circuit 50 of the 9th resistance R9, with the 4th diode
The negative pole of D4 is connected；The negative pole of the other end and the 5th diode D5 is connected；The one of 5th electric capacity C5
End is all the second end of RCD clamp circuit 50, is connected with the negative pole of the 4th diode D4；Another
End is connected with the negative pole of the 5th diode D5；The most extremely RCD clamp circuit of the 5th diode D5
First end of 50, is connected with DRAIN end.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: the second diode VR2 is Schottky diode.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: optocoupler U2 model is PC817A.
Further, the present invention provides a kind of LED thyristor regulating light drive circuit, it is also possible to have this
The feature of sample: controllable accurate source of stable pressure model is TL431.
The beneficial effect of the invention
A kind of LED thyristor regulating light drive circuit provided according to the present invention, based on SSL2101T
LED thyristor regulating light drive circuit.When the specified input of 220V, use external controllable silicon light modulation
Device, output curent change scope is 0～347.7mA, and curent change approximate log curve dimmed
Journey flicker free, has good dimming effect, and full load circuit overall transformation efficiency is 73%, merit
Rate factor is 0.762.It is preferable that this circuit has simple in construction, low cost, efficiency and power factor,
Support the advantages such as conventional controllable silicon dimmer, be suitable as replaced type low-power LED driver.
Accompanying drawing explanation
Fig. 1 is the LED thyristor regulating light drive circuit figure of the present invention.
Fig. 2 is dimming control voltage and switching frequency graph of a relation.
Detailed description of the invention
The present invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Fig. 1 is the LED thyristor regulating light drive circuit figure of the present invention.
As it is shown in figure 1, the conventional controllable silicon dimmer of a support based on SSL2101T chip is anti-
Swashing formula LED drive circuit, voltage input is 180～240V, and rated output voltage, electric current are
20V/350mA, nominal load is 7W, for driving the large power white light LED of 6 1W/350mA.
After controllable silicon dimmer is connected with alternating current power supply, two ends are connected with commutator U1；Alternating current power supply
And also set up electric fuse F1 between commutator U1.
SSL2101T chip has BRIGHTNESS end, PWMLIMIT end, RC end, RC2 end, ISENSE
End, SOURCE end, VCC end, AUX end, DRAIN end, SBLEED end, WBLEED end and GND end.
High frequency switch transformer T1, has: at a winding, the b winding of side, the c of opposite side
Winding.
Current-limiting resistance 20 first end is connected with BRIGHTNESS end, and the second end is connected with PWMLIMIT end,
3rd end is connected with electric resistance partial pressure sample circuit 10.
Oscillating circuit 40 first end is connected with RC end, and the second end is connected with RC2 end, the 3rd termination
Ground.
13rd resistance R13 one end is connected with ISENSE end, other end ground connection；14th resistance
R14 one end is connected with the negative pole of rectifier bridge U1, other end ground connection；12nd resistance R12 one end with
ISENSE end is connected, and the other end is connected with the negative pole of rectifier bridge U1.
15th resistance R15 one end is connected with SOURCE end, other end ground connection.
6th electric capacity C6 one end is connected with VCC end, other end ground connection；Second diode VR2 negative pole with
VCC end is connected, other end ground connection.Second diode VR2 is Schottky diode.
11st resistance R11 one end is connected with AUX end, the other end and the positive pole of the 6th diode D6
It is connected；Tenth resistance R10 one end is connected with the negative pole of the 6th diode D6, the other end and VCC
End is connected；B winding one end is connected with the positive pole of the 6th diode D6, other end ground connection.
RCD clamp circuit 50 first end is connected with DRAIN end, the second end and the 4th diode D4 negative pole
It is connected；C winding one end is connected with RCD clamp circuit 50 second end, and the other end is connected with DRAIN end；
The positive pole of the 4th diode D4 is connected with the positive pole of rectifier bridge U1.
Bleeder resistance 30 first end is connected with SBLEED end, and the second end is connected with WBLEED, the 3rd end
It is connected with rectifier bridge U1 positive pole.
Electric resistance partial pressure sample circuit 10 first end is connected with rectifier bridge U1 positive pole, the second end and current limliting electricity
Resistance 20 is connected, the 3rd end ground connection.
One end of first electric capacity C1 is connected with rectifier bridge U1 positive pole, other end ground connection.
One end of c winding is connected with the positive pole of the 7th diode D7, the other end and light-emitting diode group
The negative pole of LED is connected and ground connection；The positive pole of light-emitting diode group LED and the 7th diode D7 negative pole
It is connected；7th electric capacity C7, the 8th electric capacity C8 one end all with the positive pole of light-emitting diode group LED
It is connected, the other end all ground connection.
The GND end ground connection of SSL2101T chip.
LED thyristor regulating light drive circuit has output overvoltage protection circuit 60.
Optocoupler U2 uses PC817A.Controllable accurate source of stable pressure uses TL431.
16th resistance R16 one end is connected with first end of optocoupler U2, the other end and light emitting diode
Group LED positive pole is connected.
Second end of optocoupler U2 is connected with the negative pole of controllable accurate source of stable pressure, the 3rd end ground connection, and the 4th
End is connected with PWMLIMIT end；The plus earth of controllable accurate source of stable pressure.
18th resistance R18 one end is connected with first end of optocoupler U2, and the other end is with optocoupler U2's
Second end is connected.
17th resistance R17 one end is connected with the positive pole of light-emitting diode group LED, the other end with can
The reference of control precision voltage regulator is the most connected.
9th electric capacity C9 one end is extremely connected with the reference of controllable accurate source of stable pressure, the other end and optocoupler
Second end of U2 is connected.
19th resistance R19 one end is extremely connected with the reference of controllable accurate source of stable pressure, other end ground connection.
Tenth electric capacity C10 one end is connected with the positive pole of controllable accurate source of stable pressure, other end ground connection.
Electric resistance partial pressure sample circuit 10 includes the first resistance R1, the second resistance R2 and the 3rd electric capacity C3.
One end of first resistance is the first end and the rectifier bridge U1 positive pole phase of electric resistance partial pressure sample circuit 10
Even；The other end is the second end of electric resistance partial pressure sample circuit 10, is connected with current-limiting resistance 20.The
Two resistance R2 one end are all the second end of electric resistance partial pressure sample circuit 10, are connected with current-limiting resistance 20；
The other end is electric resistance partial pressure sample circuit 10 the 3rd end, ground connection.3rd electric capacity C3 one end is all electricity
Second end of resistance pressure sampling circuit 10, is connected with current-limiting resistance 20；The other end is all resistance and divides
Pressure sample circuit 10 the 3rd end, ground connection.
Current-limiting resistance 20 includes the 6th resistance R6 and the 7th resistance R7.One end of 6th resistance R6
For the first end of current-limiting resistance 20, it is connected with BRIGHTNESS end；The other end is current-limiting resistance 20
The 3rd end, be connected with electric resistance partial pressure sample circuit 10.One end of 7th resistance R7 is current limliting electricity
Second end of resistance 20, is connected with PWMLIMIT end；The other end is all the 3rd end of current-limiting resistance 20,
It is connected with electric resistance partial pressure sample circuit 10.
Bleeder resistance 30 includes the 3rd resistance R3 and the 4th resistance R4.One end of 3rd resistance R3
For the second end of bleeder resistance 30, it is connected with WBLEED end；The other end is the of bleeder resistance 30
Three ends, are connected with the positive pole of rectifier bridge U1.One end of 4th resistance R4 is the of bleeder resistance 30
One end, is connected with SBLEED end；The other end is all the 3rd end of bleeder resistance 30, with rectifier bridge
The positive pole of U1 is connected.
Oscillating circuit 40 includes the 5th resistance R5, the 8th resistance R8 and the 4th electric capacity C4.5th electricity
Resistance R5 one end is the first end of oscillating circuit 40, is connected with RC end；The other end is oscillating circuit
3rd end of 40, ground connection.8th resistance R8 one end is all the first end of oscillating circuit 40, with RC
End is connected；The other end is the second end of oscillating circuit 40, is connected with RC2 end.4th electric capacity C4
One end is all the first end of oscillating circuit 40, is connected with RC end；The other end is all oscillating circuit 40
The 3rd end, ground connection.
RCD clamp circuit 50 includes the 5th diode D5, the 5th electric capacity C5 and the 9th resistance R9.
Second end that one end is RCD clamp circuit 50 of the 9th resistance R9, with bearing of the 4th diode D4
The most connected；The negative pole of the other end and the 5th diode D5 is connected.One end of 5th electric capacity C5 is all
Second end of RCD clamp circuit 50, is connected with the negative pole of the 4th diode D4；The other end and
The negative pole of five diode D5 is connected.The of the most extremely RCD clamp circuit 50 of the 5th diode D5
One end, is connected with DRAIN end.
R1, R2 and C3 form electric resistance partial pressure sample circuit, to the DC pulse electricity after copped wave rectification
It is pressed with valid value to sample.R6, R7 are current-limiting resistance.R3, R4 are bleeder resistance, and R3 is permissible
When input current is relatively low as extra current loop, keep the normally of controllable silicon dimmer；
R4 is restarted and controllable silicon latch for the zero passage of dimmer.R5, R8 and C4 form oscillating circuit,
Upper and lower bound for configuration switch frequency.R9, C5 and D5 form RCD clamp circuit, inhale
Receive leakage inductance due to voltage spikes to protect switching tube.T1 is high frequency switch transformer, and D6 is auxiliary limit rectification
Diode, D7 is output commutation diode, R14 Yu R15 is input current sampling resistor.R17、
R19 is output voltage sampling resistor, forms output with R16, R18, TL431 and optocoupler PC817A
Overvoltage crowbar.
The method of LED thyristor regulating photocontrol is, by DC pulse moving voltage phase after detection rectifier bridge
Parallactic angle or the change of virtual value, correspondingly control the change of switching frequency or dutycycle, to change
Output voltage and electric current.Used here as the SSL2101T chip of NXP company, R1, R2 and C3
Composition dimming detection circuit, the meansigma methods of the DC pulse moving voltage of detection rectifier bridge output, by this electricity
Flatten average and be converted into a smooth d. c. voltage signal as dimming control voltage
(VBRIGHTNESS) chip is given.
Fig. 2 is dimming control voltage and switching frequency graph of a relation.
According to formula Pout=LP·IP 2·fconv·η/2Understanding, output is directly proportional to switching frequency.Such as Fig. 2
Shown in, in the range of 0-2.3V, the switching frequency of chip increases along with the increase of dimming control voltage
Adding, reduce and reduce, output and output electric current change the most accordingly, thus reach light modulation
Purpose.
Claims (10)
1. a LED thyristor regulating light drive circuit, it is characterised in that:
After controllable silicon dimmer is connected with alternating current power supply, two ends are connected with commutator (U1)；
High frequency switch transformer (T1), has: at a winding, the b winding of side, another
The c winding of side；
SSL2101T chip have BRIGHTNESS end, PWMLIMIT end, RC end, RC2 end,
ISENSE end, SOURCE end, VCC end, AUX end, DRAIN end, SBLEED end, WBLEED
End and GND end；
Current-limiting resistance (20) first end is connected with BRIGHTNESS end, the second end and PWMLIMIT
End is connected, and the 3rd end is connected with electric resistance partial pressure sample circuit (10)；
Oscillating circuit (40) first end is connected with RC end, and the second end is connected with RC2 end, the
Three end ground connection；
GND end ground connection；
13rd resistance (R13) one end is connected with ISENSE end, other end ground connection；14th
Resistance (R14) one end is connected with the negative pole of rectifier bridge (U1), other end ground connection；12nd
Resistance (R12) one end is connected with ISENSE end, the negative pole phase of the other end and rectifier bridge (U1)
Even；
15th resistance (R15) one end is connected with SOURCE end, other end ground connection；
6th electric capacity (C6) one end is connected with VCC end, other end ground connection；Second diode (VR2)
Negative pole is connected with VCC end, other end ground connection；
11st resistance (R11) one end is connected with AUX end, the other end and the 6th diode (D6)
Positive pole be connected；Tenth resistance (R10) one end is connected with the negative pole of the 6th diode (D6),
The other end is connected with VCC end；B winding one end is connected with the positive pole of the 6th diode (D6),
Other end ground connection；
RCD clamp circuit (50) first end is connected with DRAIN end, the second end and the 4th diode
(D4) negative pole is connected；C winding one end is connected with RCD clamp circuit (50) second end, another
End is connected with DRAIN end；The positive pole of the 4th diode (D4) and the positive pole of rectifier bridge (U1)
It is connected；
Bleeder resistance (30) first end is connected with SBLEED end, and the second end is connected with WBLEED,
3rd end is connected with rectifier bridge (U1) positive pole；
Electric resistance partial pressure sample circuit (10) first end is connected with rectifier bridge (U1) positive pole, and second
End is connected with current-limiting resistance (20), the 3rd end ground connection；
One end of first electric capacity (C1) is connected with rectifier bridge (U1) positive pole, other end ground connection；
One end of c winding is connected with the positive pole of the 7th diode (D7), the other end and luminous two
The negative pole of pole pipe group (LED) is connected and ground connection；The positive pole of light-emitting diode group (LED) and
Seven diodes (D7) negative pole is connected；7th electric capacity (C7), one end of the 8th electric capacity (C8)
All positive poles with light-emitting diode group (LED) are connected, the other end all ground connection.
LED thyristor regulating light drive circuit the most according to claim 1, its feature exists
In:
Also include the output overvoltage protection circuit (60) with optocoupler (U2)；
16th resistance (R16) one end is connected with the first end of optocoupler (U2), the other end with
Light-emitting diode group (LED) positive pole is connected；
Second end of optocoupler (U2) is connected with the negative pole of controllable accurate source of stable pressure, the 3rd end ground connection,
4th end is connected with PWMLIMIT end；The plus earth of controllable accurate source of stable pressure；
18th resistance (R18) one end is connected with the first end of optocoupler (U2), the other end with
Second end of optocoupler (U2) is connected；
17th resistance (R17) one end is connected, separately with the positive pole of light-emitting diode group (LED)
One end is extremely connected with the reference of controllable accurate source of stable pressure；
9th electric capacity (C9) one end is extremely connected with the reference of controllable accurate source of stable pressure, the other end with
Second end of optocoupler (U2) is connected；
19th resistance (R19) one end is extremely connected with the reference of controllable accurate source of stable pressure, another
End ground connection；
Tenth electric capacity (C10) one end is connected with the positive pole of controllable accurate source of stable pressure, another termination
Ground.
LED thyristor regulating light drive circuit the most according to claim 1 and 2, it is special
Levy and be:
Wherein, electric resistance partial pressure sample circuit (10) includes the first resistance (R1), the second resistance
And the 3rd electric capacity (C3) (R2)；
One end of first resistance is the first end and the rectifier bridge of electric resistance partial pressure sample circuit (10)
(U1) positive pole is connected；The other end is the second end of electric resistance partial pressure sample circuit (10), with limit
Leakage resistance (20) is connected；
Second resistance (R2) one end is all the second end of electric resistance partial pressure sample circuit (10), with
Current-limiting resistance (20) is connected；The other end is electric resistance partial pressure sample circuit (10) the 3rd end, connects
Ground；
3rd electric capacity (C3) one end is all the second end of electric resistance partial pressure sample circuit (10), with
Current-limiting resistance (20) is connected；The other end is all electric resistance partial pressure sample circuit (10) the 3rd end,
Ground connection.
LED thyristor regulating light drive circuit the most according to claim 1 and 2, it is special
Levy and be:
Wherein, current-limiting resistance (20) includes the 6th resistance (R6) and the 7th resistance (R7)；
First end that one end is current-limiting resistance (20) of the 6th resistance (R6), with BRIGHTNESS
End is connected；The other end is the 3rd end of current-limiting resistance (20), with electric resistance partial pressure sample circuit (10)
It is connected；
Second end that one end is current-limiting resistance (20) of the 7th resistance (R7), with PWMLIMIT
End is connected；The other end is all the 3rd end of current-limiting resistance (20), with electric resistance partial pressure sample circuit
(10) it is connected.
LED thyristor regulating light drive circuit the most according to claim 1 and 2, it is special
Levy and be:
Wherein, bleeder resistance (30) includes the 3rd resistance (R3) and the 4th resistance (R4)；
Second end that one end is bleeder resistance (30) of the 3rd resistance (R3), with WBLEED
End is connected；The other end is the 3rd end of bleeder resistance (30), with the positive pole of rectifier bridge (U1)
It is connected；
First end that one end is bleeder resistance (30) of the 4th resistance (R4), with SBLEED
End is connected；The other end is all the 3rd end of bleeder resistance (30), with rectifier bridge (U1) just
The most connected.
LED thyristor regulating light drive circuit the most according to claim 1 and 2, it is special
Levy and be:
Wherein, oscillating circuit (40) include the 5th resistance (R5), the 8th resistance (R8) and
4th electric capacity (C4)；
5th resistance (R5) one end is the first end of oscillating circuit (40), is connected with RC end；
The other end is the 3rd end of oscillating circuit (40), ground connection；
8th resistance (R8) one end is all the first end of oscillating circuit (40), with RC end phase
Even；The other end is the second end of oscillating circuit (40), is connected with RC2 end；
4th electric capacity (C4) one end is all the first end of oscillating circuit (40), with RC end phase
Even；The other end is all the 3rd end of oscillating circuit (40), ground connection.
LED thyristor regulating light drive circuit the most according to claim 1 and 2, it is special
Levy and be:
Wherein, RCD clamp circuit (50) includes the 5th diode (D5), the 5th electric capacity (C5)
With the 9th resistance (R9)；
Second end that one end is RCD clamp circuit (50) of the 9th resistance (R9), with the 4th
The negative pole of diode (D4) is connected；The negative pole of the other end and the 5th diode (D5) is connected；
One end of 5th electric capacity (C5) is all the second end of RCD clamp circuit (50), with
The negative pole of four diodes (D4) is connected；The negative pole of the other end and the 5th diode (D5) is connected；
First end of the most extremely RCD clamp circuit (50) of the 5th diode (D5), with
DRAIN end is connected.
LED thyristor regulating light drive circuit the most according to claim 1 and 2, it is special
Levy and be:
Wherein, the second diode (VR2) is Schottky diode.
LED thyristor regulating light drive circuit the most according to claim 2, its feature exists
In:
Wherein, optocoupler (U2) model is PC817A.
LED thyristor regulating light drive circuit the most according to claim 2, its feature exists
In:
Wherein, controllable accurate source of stable pressure model is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510086359.XA CN105992438A (en) | 2015-02-16 | 2015-02-16 | LED silicon controlled rectifier dimming driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510086359.XA CN105992438A (en) | 2015-02-16 | 2015-02-16 | LED silicon controlled rectifier dimming driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105992438A true CN105992438A (en) | 2016-10-05 |
Family
ID=57037780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510086359.XA Pending CN105992438A (en) | 2015-02-16 | 2015-02-16 | LED silicon controlled rectifier dimming driving circuit |
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| Country | Link |
|---|---|
| CN (1) | CN105992438A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655787A (en) * | 2016-11-28 | 2017-05-10 | 北京无线电测量研究所 | Voltage conversion array plane power supply circuit |
| CN107734761A (en) * | 2017-11-01 | 2018-02-23 | 上海典芯半导体有限公司 | A kind of integrated LED light adjusting circuits of hypervelocity |
| CN107800273A (en) * | 2017-11-27 | 2018-03-13 | 浙江凯发电气有限公司 | A kind of external circuit breaker electric source circuit of electric energy meter |
| CN109936889A (en) * | 2017-12-15 | 2019-06-25 | 松下知识产权经营株式会社 | Dimming drive circuit and lighting device using the same |
-
2015
- 2015-02-16 CN CN201510086359.XA patent/CN105992438A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655787A (en) * | 2016-11-28 | 2017-05-10 | 北京无线电测量研究所 | Voltage conversion array plane power supply circuit |
| CN107734761A (en) * | 2017-11-01 | 2018-02-23 | 上海典芯半导体有限公司 | A kind of integrated LED light adjusting circuits of hypervelocity |
| CN107800273A (en) * | 2017-11-27 | 2018-03-13 | 浙江凯发电气有限公司 | A kind of external circuit breaker electric source circuit of electric energy meter |
| CN109936889A (en) * | 2017-12-15 | 2019-06-25 | 松下知识产权经营株式会社 | Dimming drive circuit and lighting device using the same |
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Application publication date: 20161005 |