CN204465967U - The inverse-excitation type LED drive circuit of controllable silicon dimmer - Google Patents
The inverse-excitation type LED drive circuit of controllable silicon dimmer Download PDFInfo
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Abstract
The utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, and after controllable silicon dimmer is connected with AC power, two ends are connected with rectifier; There is high frequency switch transformer, SSL2101T chip, electric resistance partial pressure sample circuit, current-limiting resistance, bleeder resistance, oscillating circuit and RCD clamp circuit.Its advantage is to use external controllable silicon dimmer, and output current excursion is 0 ~ 347.7mA, curent change approximate log curve, dimming process flicker free, have good dimming effect, full load circuit integrity conversion efficiency is 73%, and power factor is 0.762.It is simple that this circuit has structure, and cost is low, and efficiency and power factor better, are supported the advantages such as conventional controllable silicon dimmer, are suitable as replaced type low-power LED driver.
Description
Technical field
The utility model relates to a kind of LED drive circuit, particularly a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer.
Background technology
Controllable silicon dimmer, starts to be applied to incandescent lamp light modulation most, can control the energy giving bulb easily by light-control knob, thus regulates the brightness of incandescent lamp.Controllable silicon dimmer has huge energy-saving benefit.
At present, in order to energy-saving LED lamp more and more replaces incandescent lamp.How to adopt the light modulation of controllable silicon dimmer compatible with LED to drive, playing larger energy-saving effect becomes the problem needing to solve.
Utility model content
The inverse-excitation type LED drive circuit of a kind of controllable silicon dimmer provided of the present utility model, to overcome the defect of above-mentioned prior art.
The utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, and after controllable silicon dimmer is connected with AC power, two ends are connected with rectifier U1; High frequency switch transformer T1, has: at a winding, the b winding of side, 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 is held with BRIGHTNESS and is connected, and the second end is held with PWMLIMIT and is connected, and the 3rd end is connected with electric resistance partial pressure sample circuit 10; Oscillating circuit 40 first end is held with RC and is connected, and the second end is held with RC2 and is connected, the 3rd end ground connection; GND holds ground connection; 13 resistance R13 one end is held with ISENSE and is connected, other end ground connection; 14 resistance R14 one end is connected with the negative pole of rectifier bridge U1, other end ground connection; 12 resistance R12 one end is held with ISENSE and is connected, and the other end is connected with the negative pole of rectifier bridge U1; 15 resistance R15 one end is held with SOURCE and is connected, other end ground connection; 6th electric capacity C6 one end is held with VCC and is connected, other end ground connection; Second diode VR2 negative pole is held with VCC and is connected, other end ground connection; 11 resistance R11 one end is held with AUX and is connected, and the other end is connected with the positive pole of the 6th diode D6; Tenth resistance R10 one end is connected with the negative pole of the 6th diode D6, and the other end is held with VCC and 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 held with DRAIN and is connected, and the second end is connected with the 4th diode D4 negative pole; C winding one end is connected with RCD clamp circuit 50 second end, and the other end is held with DRAIN and is connected; The positive pole of the 4th diode D4 is connected with the positive pole of rectifier bridge U1; Bleeder resistance 30 first end is held with SBLEED and is connected, and the second end is connected with WBLEED, and the 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 the 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, and the other end is connected with the negative pole of light-emitting diode group LED and ground connection; The positive pole of light-emitting diode group LED is connected with the 7th diode D7 negative pole; One end of 7th electric capacity C7, the 8th electric capacity C8 is all connected with the positive pole of light-emitting diode group LED, and the other end is ground connection all.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: also comprise the output overvoltage protection circuit 60 with optocoupler U2; 16 resistance R16 one end is connected with the first end of optocoupler U2, and the other end is connected with light-emitting diode group LED positive pole; 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 held with PWMLIMIT and is connected; The plus earth of controllable accurate source of stable pressure; 18 resistance R18 one end is connected with the first end of optocoupler U2, and the other end is connected with second end of optocoupler U2; 17 resistance R17 one end is connected with the positive pole of light-emitting diode group LED, and the other 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, and the other end is connected with second end of optocoupler U2; 19 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.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: electric resistance partial pressure sample circuit 10 comprises the first resistance R1, the second resistance R2 and the 3rd electric capacity C3; One end of first resistance be electric resistance partial pressure sample circuit 10 first end, be connected with rectifier bridge U1 positive pole; The other end is the second end of electric resistance partial pressure sample circuit 10, is connected with current-limiting resistance 20; Second resistance R2 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 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 is all electric resistance partial pressure sample circuit 10 the 3rd end, ground connection.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: current-limiting resistance 20 comprises the 6th resistance R6 and the 7th resistance R7; One end of 6th resistance R6 is the first end of current-limiting resistance 20, holds be connected with BRIGHTNESS; The other end is the 3rd end of current-limiting resistance 20, is connected with electric resistance partial pressure sample circuit 10; One end of 7th resistance R7 is the second end of current-limiting resistance 20, holds be connected with PWMLIMIT; The other end is all the 3rd end of current-limiting resistance 20, is connected with electric resistance partial pressure sample circuit 10.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: bleeder resistance 30 comprises the 3rd resistance R3 and the 4th resistance R4; One end of 3rd resistance R3 is the second end of bleeder resistance 30, holds be connected with WBLEED; The other end is the 3rd end of bleeder resistance 30, is connected with the positive pole of rectifier bridge U1; One end of 4th resistance R4 is the first end of bleeder resistance 30, holds be connected with SBLEED; The other end is all the 3rd end of bleeder resistance 30, is connected with the positive pole of rectifier bridge U1.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: oscillating circuit 40 comprises 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, holds be connected with RC; 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, holds be connected with RC; The other end is the second end of oscillating circuit 40, holds be connected with RC2; 4th electric capacity C4 one end is all the first end of oscillating circuit 40, holds be connected with RC; The other end is all the 3rd end of oscillating circuit 40, ground connection.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: RCD clamp circuit 50 comprises the 5th diode D5, the 5th electric capacity C5 and the 9th resistance R9; One end of 9th resistance R9 is the second end of RCD clamp circuit 50, is connected with the negative pole of the 4th diode D4; The other end is connected with the negative pole of the 5th diode D5; One end of 5th electric capacity C5 is all the second end of RCD clamp circuit 50, is connected with the negative pole of the 4th diode D4; The other end is connected with the negative pole of the 5th diode D5; The first end of the just very RCD clamp circuit 50 of the 5th diode D5, holds with DRAIN and is connected.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: the second diode VR2 is Schottky diode.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: optocoupler U2 model is PC817A.
Further, the utility model provides a kind of inverse-excitation type LED drive circuit of controllable silicon dimmer, can also have such feature: controllable accurate source of stable pressure model is TL431.
The beneficial effect of utility model
According to the inverse-excitation type LED drive circuit of a kind of controllable silicon dimmer that the utility model provides, based on the inverse-excitation type LED drive circuit of the controllable silicon dimmer of SSL2101T.When the specified input of 220V, use external controllable silicon dimmer, output current excursion is 0 ~ 347.7mA, curent change approximate log curve, dimming process flicker free, has good dimming effect, full load circuit integrity conversion efficiency is 73%, and power factor is 0.762.It is simple that this circuit has structure, and cost is low, and efficiency and power factor better, are supported the advantages such as conventional controllable silicon dimmer, are suitable as replaced type low-power LED driver.
Accompanying drawing explanation
Fig. 1 is the inverse-excitation type LED drive circuit figure of controllable silicon dimmer of the present utility model.
Fig. 2 is dimming control voltage and switching frequency graph of a relation.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Fig. 1 is the inverse-excitation type LED drive circuit figure of controllable silicon dimmer of the present utility model.
As shown in Figure 1, based on the inverse-excitation type LED drive circuit of the conventional controllable silicon dimmer of a support of SSL2101T chip, voltage is input as 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 AC power, two ends are connected with rectifier U1; Between AC power and rectifier U1, fuse F1 is also set.
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 winding of opposite side.
Current-limiting resistance 20 first end is held with BRIGHTNESS and is connected, and the second end is held with PWMLIMIT and is connected, and the 3rd end is connected with electric resistance partial pressure sample circuit 10.
Oscillating circuit 40 first end is held with RC and is connected, and the second end is held with RC2 and is connected, the 3rd end ground connection.
13 resistance R13 one end is held with ISENSE and is connected, other end ground connection; 14 resistance R14 one end is connected with the negative pole of rectifier bridge U1, other end ground connection; 12 resistance R12 one end is held with ISENSE and is connected, and the other end is connected with the negative pole of rectifier bridge U1.
15 resistance R15 one end is held with SOURCE and is connected, other end ground connection.
6th electric capacity C6 one end is held with VCC and is connected, other end ground connection; Second diode VR2 negative pole is held with VCC and is connected, other end ground connection.Second diode VR2 is Schottky diode.
11 resistance R11 one end is held with AUX and is connected, and the other end is connected with the positive pole of the 6th diode D6; Tenth resistance R10 one end is connected with the negative pole of the 6th diode D6, and the other end is held with VCC and 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 held with DRAIN and is connected, and the second end is connected with the 4th diode D4 negative pole; C winding one end is connected with RCD clamp circuit 50 second end, and the other end is held with DRAIN and is connected; The positive pole of the 4th diode D4 is connected with the positive pole of rectifier bridge U1.
Bleeder resistance 30 first end is held with SBLEED and is connected, and the second end is connected with WBLEED, and the 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 the 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, and the other end is connected with the negative pole of light-emitting diode group LED and ground connection; The positive pole of light-emitting diode group LED is connected with the 7th diode D7 negative pole; One end of 7th electric capacity C7, the 8th electric capacity C8 is all connected with the positive pole of light-emitting diode group LED, and the other end is ground connection all.
The GND of SSL2101T chip holds ground connection.
The inverse-excitation type LED drive circuit of controllable silicon dimmer has output overvoltage protection circuit 60.
Optocoupler U2 adopts PC817A.Controllable accurate source of stable pressure adopts TL431.
16 resistance R16 one end is connected with the first end of optocoupler U2, and the other end is connected with light-emitting diode group LED positive pole.
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 held with PWMLIMIT and is connected; The plus earth of controllable accurate source of stable pressure.
18 resistance R18 one end is connected with the first end of optocoupler U2, and the other end is connected with second end of optocoupler U2.
17 resistance R17 one end is connected with the positive pole of light-emitting diode group LED, and the other 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, and the other end is connected with second end of optocoupler U2.
19 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 comprises the first resistance R1, the second resistance R2 and the 3rd electric capacity C3.One end of first resistance be electric resistance partial pressure sample circuit 10 first end, be connected with rectifier bridge U1 positive pole; The other end is the second end of electric resistance partial pressure sample circuit 10, is connected with current-limiting resistance 20.Second resistance R2 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 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 is all electric resistance partial pressure sample circuit 10 the 3rd end, ground connection.
Current-limiting resistance 20 comprises the 6th resistance R6 and the 7th resistance R7.One end of 6th resistance R6 is the first end of current-limiting resistance 20, holds be connected with BRIGHTNESS; The other end is the 3rd end of current-limiting resistance 20, is connected with electric resistance partial pressure sample circuit 10.One end of 7th resistance R7 is the second end of current-limiting resistance 20, holds be connected with PWMLIMIT; The other end is all the 3rd end of current-limiting resistance 20, is connected with electric resistance partial pressure sample circuit 10.
Bleeder resistance 30 comprises the 3rd resistance R3 and the 4th resistance R4.One end of 3rd resistance R3 is the second end of bleeder resistance 30, holds be connected with WBLEED; The other end is the 3rd end of bleeder resistance 30, is connected with the positive pole of rectifier bridge U1.One end of 4th resistance R4 is the first end of bleeder resistance 30, holds be connected with SBLEED; The other end is all the 3rd end of bleeder resistance 30, is connected with the positive pole of rectifier bridge U1.
Oscillating circuit 40 comprises 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, holds be connected with RC; 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, holds be connected with RC; The other end is the second end of oscillating circuit 40, holds be connected with RC2.4th electric capacity C4 one end is all the first end of oscillating circuit 40, holds be connected with RC; The other end is all the 3rd end of oscillating circuit 40, ground connection.
RCD clamp circuit 50 comprises the 5th diode D5, the 5th electric capacity C5 and the 9th resistance R9.One end of 9th resistance R9 is the second end of RCD clamp circuit 50, is connected with the negative pole of the 4th diode D4; The other end is connected with the negative pole of the 5th diode D5.One end of 5th electric capacity C5 is all the second end of RCD clamp circuit 50, is connected with the negative pole of the 4th diode D4; The other end is connected with the negative pole of the 5th diode D5.The first end of the just very RCD clamp circuit 50 of the 5th diode D5, holds with DRAIN and is connected.
R1, R2 and C3 form electric resistance partial pressure sample circuit, sample to the DC pulse moving voltage effective value after copped wave rectification.R6, R7 are current-limiting resistance.R3, R4 are bleeder resistance, and R3 when input current is lower as extra current circuit, can keep the normally of controllable silicon dimmer; R4 is used for the zero passage of dimmer and restarts and latch with controllable silicon.R5, R8 and C4 form oscillating circuit, for the upper and lower bound of configuration switch frequency.R9, C5 and D5 form RCD clamp circuit, absorb leakage inductance due to voltage spikes with protection switch pipe.T1 is high frequency switch transformer, and D6 is auxiliary limit rectifier diode, and D7 is for exporting rectifier diode, and R14 and R15 is input current sampling resistor.R17, R19 are output voltage sampling resistor, form output overvoltage protection circuit with R16, R18, TL431 and optocoupler PC817A.
The method of LED thyristor regulating photocontrol is, by the change of DC pulse moving voltage phase angle or effective value after detection rectifier bridge, carrys out the change of correspondingly control switch frequency or duty ratio, to change output voltage and electric current.Here the SSL2101T chip of NXP company is used, R1, R2 and C3 form dimming detection circuit, detect the mean value of DC pulse moving voltage that rectifier bridge exports, this average voltage is converted into a level and smooth d. c. voltage signal and gives chip as dimming control voltage (VBRIGHTNESS).
Fig. 2 is dimming control voltage and switching frequency graph of a relation.
According to formula P
out=l
pi
p 2f
convη/2 are known, and power output is directly proportional to switching frequency.As shown in Figure 2, within the scope of 0-2.3V, the switching frequency of chip increases along with the increase of dimming control voltage, reduces and reduces, the also corresponding change thereupon of power output and output current, thus reaching the object of light modulation.
Claims (10)
1. an inverse-excitation type LED drive circuit for controllable silicon dimmer, is characterized in that:
After controllable silicon dimmer is connected with AC power, two ends are connected with rectifier (U1);
High frequency switch transformer (T1), has: at a winding, the b winding of side, 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 is held with BRIGHTNESS and is connected, and the second end is held with PWMLIMIT and is connected, and the 3rd end is connected with electric resistance partial pressure sample circuit (10);
Oscillating circuit (40) first end is held with RC and is connected, and the second end is held with RC2 and is connected, the 3rd end ground connection;
GND holds ground connection;
13 resistance (R13) one end is held with ISENSE and is connected, other end ground connection; 14 resistance (R14) one end is connected with the negative pole of rectifier bridge (U1), other end ground connection; 12 resistance (R12) one end is held with ISENSE and is connected, and the other end is connected with the negative pole of rectifier bridge (U1);
15 resistance (R15) one end is held with SOURCE and is connected, other end ground connection;
6th electric capacity (C6) one end is held with VCC and is connected, other end ground connection; Second diode (VR2) negative pole is held with VCC and is connected, other end ground connection;
11 resistance (R11) one end is held with AUX and is connected, and the other end is connected with the positive pole of the 6th diode (D6); Tenth resistance (R10) one end is connected with the negative pole of the 6th diode (D6), and the other end is held with VCC and 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 held with DRAIN and is connected, and the second end is connected with the 4th diode (D4) negative pole; C winding one end is connected with RCD clamp circuit (50) second end, and the other end is held with DRAIN and is connected; The positive pole of the 4th diode (D4) is connected with the positive pole of rectifier bridge (U1);
Bleeder resistance (30) first end is held with SBLEED and is connected, and the second end is connected with WBLEED, and the 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 the 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), and the other end is connected with the negative pole of light-emitting diode group (LED) and ground connection; The positive pole of light-emitting diode group (LED) is connected with the 7th diode (D7) negative pole; One end of 7th electric capacity (C7), the 8th electric capacity (C8) is all connected with the positive pole of light-emitting diode group (LED), and the other end is ground connection all.
2. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 1, is characterized in that:
Also comprise the output overvoltage protection circuit (60) with optocoupler (U2);
16 resistance (R16) one end is connected with the first end of optocoupler (U2), and the other end is connected with light-emitting diode group (LED) positive pole;
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 held with PWMLIMIT and is connected; The plus earth of controllable accurate source of stable pressure;
18 resistance (R18) one end is connected with the first end of optocoupler (U2), and the other end is connected with the second end of optocoupler (U2);
17 resistance (R17) one end is connected with the positive pole of light-emitting diode group (LED), and the other 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, and the other end is connected with the second end of optocoupler (U2);
19 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.
3. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 1 and 2, is characterized in that:
Wherein, electric resistance partial pressure sample circuit (10) comprises the first resistance (R1), the second resistance (R2) and the 3rd electric capacity (C3);
One end of first resistance be electric resistance partial pressure sample circuit (10) first end, be connected with rectifier bridge (U1) positive pole; The other end is the second end of electric resistance partial pressure sample circuit (10), is connected with current-limiting resistance (20);
Second resistance (R2) 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 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 is all electric resistance partial pressure sample circuit (10) the 3rd end, ground connection.
4. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 1 and 2, is characterized in that:
Wherein, current-limiting resistance (20) comprises the 6th resistance (R6) and the 7th resistance (R7);
One end of 6th resistance (R6) is the first end of current-limiting resistance (20), holds be connected with BRIGHTNESS; The other end is the 3rd end of current-limiting resistance (20), is connected with electric resistance partial pressure sample circuit (10);
One end of 7th resistance (R7) is the second end of current-limiting resistance (20), holds be connected with PWMLIMIT; The other end is all the 3rd end of current-limiting resistance (20), is connected with electric resistance partial pressure sample circuit (10).
5. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 1 and 2, is characterized in that:
Wherein, bleeder resistance (30) comprises the 3rd resistance (R3) and the 4th resistance (R4);
One end of 3rd resistance (R3) is the second end of bleeder resistance (30), holds be connected with WBLEED; The other end is the 3rd end of bleeder resistance (30), is connected with the positive pole of rectifier bridge (U1);
One end of 4th resistance (R4) is the first end of bleeder resistance (30), holds be connected with SBLEED; The other end is all the 3rd end of bleeder resistance (30), is connected with the positive pole of rectifier bridge (U1).
6. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 1 and 2, is characterized in that:
Wherein, oscillating circuit (40) comprises 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), holds be connected with RC; 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), holds be connected with RC; The other end is the second end of oscillating circuit (40), holds be connected with RC2;
4th electric capacity (C4) one end is all the first end of oscillating circuit (40), holds be connected with RC; The other end is all the 3rd end of oscillating circuit (40), ground connection.
7. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 1 and 2, is characterized in that:
Wherein, RCD clamp circuit (50) comprises the 5th diode (D5), the 5th electric capacity (C5) and the 9th resistance (R9);
One end of 9th resistance (R9) is the second end of RCD clamp circuit (50), is connected with the negative pole of the 4th diode (D4); The other end is connected with the negative pole of the 5th diode (D5);
One end of 5th electric capacity (C5) is all the second end of RCD clamp circuit (50), is connected with the negative pole of the 4th diode (D4); The other end is connected with the negative pole of the 5th diode (D5);
The first end of the just very RCD clamp circuit (50) of the 5th diode (D5), holds with DRAIN and is connected.
8. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 1 and 2, is characterized in that:
Wherein, the second diode (VR2) is Schottky diode.
9. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 2, is characterized in that:
Wherein, optocoupler (U2) model is PC817A.
10. the inverse-excitation type LED drive circuit of controllable silicon dimmer according to claim 2, is characterized in that:
Wherein, controllable accurate source of stable pressure model is TL431.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591540A (en) * | 2015-11-16 | 2016-05-18 | 浙江凯耀照明股份有限公司 | Auxiliary direct current low-voltage power supply circuit applicable to switch power supply |
| 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 |
-
2015
- 2015-02-16 CN CN201520113033.7U patent/CN204465967U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105591540A (en) * | 2015-11-16 | 2016-05-18 | 浙江凯耀照明股份有限公司 | Auxiliary direct current low-voltage power supply circuit applicable to switch power supply |
| 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 |
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