CN105451408B - A kind of BUCK types circuit of LED - Google Patents
A kind of BUCK types circuit of LED Download PDFInfo
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- CN105451408B CN105451408B CN201410444388.4A CN201410444388A CN105451408B CN 105451408 B CN105451408 B CN 105451408B CN 201410444388 A CN201410444388 A CN 201410444388A CN 105451408 B CN105451408 B CN 105451408B
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Abstract
The invention discloses a kind of BUCK types circuit of LED, including：Pressure unit, LED circuit unit, N type switch tube and control unit, wherein pressure unit is for being depressured the alternating voltage for being input to BUCK type circuit of LED from power grid；LED circuit unit includes at least one light emitting diode, and the LED circuit unit is connect with pressure unit and N type switch tube, and makes the light emitting diode continue to shine in the case where N type switch tube turns off；Control unit includes the Darlington transistor being made of two N-type double pole triodes, and described control unit is connect with N type switch tube and LED circuit unit, and the shutdown of N type switch tube is controlled by temperature-compensating and Voltage Feedback.The BUCK type circuit of LED of the present invention can make the electric current of the light emitting diode in circuit more stable when fluctuation occurs for the alternating voltage of power grid input or environment temperature fluctuates.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of BUCK types circuit of LED.
Background technology
BUCK type circuits, also referred to as Buck conversion circuit, the circuit can be depressured higher input voltage, so
Output gives the load of circuit connection afterwards, operating voltage is provided for load, for example, BUCK types circuit can be light emitting diode
The luminous offer operating voltage of (Light-Emitting Diode, abbreviation LED).
Fig. 1 is the circuit diagram of the BUCK type circuit of LED of the prior art.As shown in Figure 1, the BUCK types shine
Diode circuit includes：Fuse FUS, rectifier bridge, inductor LS1, the first capacitor being made of four the first diode DS1
To third capacitor (CS1-CS3), the first light emitting diode LDS1, the second light emitting diode LDS2, the second diode DS2,
Three diode DS3, the main winding TS1 of transformer and auxiliary winding TS2, the first electric group to the 6th resistance (RS1-RS6) and first
Transistor QS1 and second transistor QS2, wherein the first transistor QS1 and second transistor QS2 is ambipolar three pole of N-type
Pipe, and second transistor QS2 is used to control the shutdown of the first transistor QS1；In addition, the VAC expressions in Fig. 1 are input to from power grid
The alternating voltage of BUCK type circuit of LED.
As shown in Figure 1, pass through the electricity of two light emitting diodes (LDS1 and LDS2) in BUCK type circuit of LED
Stream determined by the turn-on and turn-off of the first transistor QS1, and the shutdown of the first transistor QS1 be by second transistor QS2 Lai
Control, principle are：When second transistor QS2 is connected, the ideal base drive current of the first transistor QS1 passes through second transistor
QS2 is discharged so that the first transistor QS1 shutdowns.According to the characteristic of double pole triode, when environment temperature increases, second
The forward voltage of BE (the base stage and emitter) knots of transistor QS2 can reduce, this can influence second transistor QS2 to first crystal
The control of pipe QS1, to generate large effect to the electric current of light emitting diode；When the alternating voltage VAC of power grid input increases
When, second transistor QS2 can not turn off the first transistor QS1 in time, to the electric current of light emitting diode also will produce compared with
Big influence.
In conclusion BUCK types circuit of LED in the prior art, when wave occurs for the alternating voltage of power grid input
When dynamic or environment temperature fluctuates, large effect can be generated to the electric current of the light emitting diode in circuit, to influence
The stability of its electric current.
Invention content
In view of this, the embodiment of the present invention provides a kind of BUCK types circuit of LED, it is in the prior art to solve
BUCK type circuit of LED can be right when fluctuation occurs for the alternating voltage of power grid input or environment temperature fluctuates
The technical issues of electric current of light emitting diode in circuit generates large effect, stability to influence its electric current.
An embodiment of the present invention provides a kind of BUCK types circuit of LED, including：Pressure unit, light emitting diode return
Road unit, N type switch tube and control unit, wherein
The pressure unit is for being depressured the alternating voltage for being input to BUCK type circuit of LED from power grid；
The LED circuit unit includes at least one light emitting diode, the LED circuit unit with
The pressure unit is connected with the N type switch tube, and makes the light emitting diode in the case where the N type switch tube turns off
Continue to shine；
Described control unit includes the Darlington transistor being made of two N-type double pole triodes, described control unit and institute
N type switch tube is stated to connect with the LED circuit unit, described control unit by temperature-compensating and Voltage Feedback come
Control the shutdown of the N type switch tube.
Further, described control unit is additionally operable to control the conducting of the N type switch tube；
Described control unit includes the shutdown subelement that subelement is connected and is connect with the conducting subelement, wherein institute
The conducting that conducting subelement is used to control the N type switch tube is stated, the shutdown subelement is used to pass through temperature-compensating and voltage
It feeds back to control the shutdown of the N type switch tube, the shutdown subelement includes Darlington transistor.
Further, the Darlington transistor in the shutdown subelement includes the first N-type triode and the second N-type triode,
The first N-type triode and the second N-type triode are N-type double pole triode, the base of the first N-type triode
Base stage of the pole as the Darlington transistor, the collector of the collector of the first N-type triode and the second N-type triode
It is connected together as the collector of the Darlington transistor, the emitter of the first N-type triode and three pole of the second N-type
The base stage of pipe connects, the emitter of the emitter of the second N-type triode as the Darlington transistor；
The shutdown subelement further includes the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and
Nine resistance, wherein the 8th resistance is negative tempperature coefficient thermistor；
One end of 4th resistance is connect with the conducting subelement, the other end and the described 5th of the 4th resistance
One end of resistance is connected with one end of the 6th resistance, the other end of the 5th resistance and the base stage of the Darlington transistor and
One end of 7th resistance connects, and the other end of the 7th resistance is connect with one end of the 8th resistance, and the described 8th
The other end of resistance is connected together and is grounded with the emitter of the Darlington transistor, the collector of the Darlington transistor with it is described
Subelement connection is connected, the other end of the 6th resistance is connect with one end of the N type switch tube and the 9th resistance, institute
State the other end ground connection of the 9th resistance.
Further, the conducting subelement includes：First resistor, second resistance, 3rd resistor, the first capacitor,
The auxiliary winding of one diode and transformer, wherein the first end of one end of the first resistor and the auxiliary winding of the transformer
It is connected with one end of the 4th resistance in the shutdown subelement, the other end of the first resistor and first capacitor
First end connects, the second end ground connection of the auxiliary winding of the transformer, the second end of first capacitor and second electricity
One end of resistance, the collector for turning off the Darlington transistor in subelement are connected with the N type switch tube, the second resistance
The other end is connect with the LED circuit unit, the one end and institute of one end of the 3rd resistor with the second resistance
State the cathode connection of the first diode, the plus earth of the other end of the 3rd resistor and first diode.
Further, the N type switch tube is third N-type triode, and the base stage of the third N-type triode is led with described
The second end connection of the first capacitor in logical subelement, the emitter of the third N-type triode and the shutdown subelement
In the 6th resistance other end connection, the collector of the third N-type triode and the LED circuit unit connect
It connects.
Further, the LED circuit unit includes the first light emitting diode, the second light emitting diode, transformation
The main winding of device, the second capacitor and the second diode；
The cathode of the first end of the main winding of the transformer and second light emitting diode, second capacitor
First end is connected with the other end of the second resistance in the conducting subelement, the second end of the main winding of the transformer and institute
The collector for stating third N-type triode is connected with the anode of second diode, the cathode of second diode with it is described
The anode of first light emitting diode, second capacitor second end connected with the pressure unit, described first shine two
The cathode of pole pipe is connect with the anode of second light emitting diode.
Further, the pressure unit include fuse, the rectifier bridge, the third capacitance that are made of four third diodes
Device, inductor and the tenth resistance, wherein the tenth resistance is metal oxide varistor；
One end of the fuse and the third end of the rectifier bridge constitute the input terminal of the pressure unit, the decompression
The input terminal of unit is for receiving the alternating voltage inputted from power grid, the other end of the fuse and the first of the rectifier bridge
End connection, the second end of the rectifier bridge are connect with one end of the inductor, the 4th end ground connection of the rectifier bridge, the electricity
The other end of sensor is connect with one end of the first end of the third capacitor and the tenth resistance, the third capacitor
The other end of second end and the tenth resistance is grounded.
Further, the third N-type triode is N-type double pole triode.
BUCK types circuit of LED provided in an embodiment of the present invention, passes through the temperature-compensating of the control unit in circuit
The shutdown of N type switch tube is controlled with Voltage Feedback, wherein temperature-compensating can be such that control unit is fluctuated in environment temperature
When can control the shutdown of N type switch tube more stablely, Voltage Feedback can make the alternating current that control unit is inputted in power grid
The shutdown of N type switch tube can be controlled when pressure life fluctuation more in time, in this way when wave occurs for the alternating voltage of power grid input
When dynamic or environment temperature fluctuates, the influence of the electric current to the light emitting diode in circuit can be reduced, so as to so that
The electric current of light emitting diode is more stable.
Description of the drawings
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, of the invention other
Feature, objects and advantages will become more apparent upon：
Fig. 1 is the circuit diagram of the BUCK type circuit of LED of the prior art；
Fig. 2 is a kind of structural schematic diagram of BUCK types circuit of LED provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of another kind BUCK type circuit of LED provided in an embodiment of the present invention；
Fig. 4 is a kind of circuit diagram of BUCK types circuit of LED provided in an embodiment of the present invention.
Specific implementation mode
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limitation of the invention.It also should be noted that in order to just
In description, only some but not all contents related to the present invention are shown in the drawings.
The embodiment of the present invention provides a kind of BUCK types circuit of LED.Fig. 2 is one kind provided in an embodiment of the present invention
The structural schematic diagram of BUCK type circuit of LED.As shown in Fig. 2, the BUCK types circuit of LED includes：Decompression
Unit 11, LED circuit unit 12, N type switch tube 13 and control unit 14, wherein the pressure unit 11 for pair
The alternating voltage that BUCK type circuit of LED is input to from power grid is depressured；The LED circuit unit 12 wraps
Include at least one light emitting diode, the LED circuit unit 12 and the pressure unit 11 and the N type switch tube
13 connections, and make the light emitting diode continue to shine in the case where the N type switch tube 13 turns off；Described control unit 14
Include the Darlington transistor being made of two N-type double pole triodes, described control unit 14 and the N type switch tube 13 and described
LED circuit unit 12 connects, and described control unit 14 is controlled the N-type by temperature-compensating and Voltage Feedback and opened
Close the shutdown of pipe 13.
It should be noted that described control unit 14 controls N type switch tube 13 by temperature-compensating and Voltage Feedback
Shutdown, wherein the part with temperature compensation function can be arranged as required to corresponding temperature-compensating electricity in control unit 14
Realize that the part with Voltage Feedback effect can be arranged as required to corresponding voltage feedback circuit in control unit 14 in road
To realize.
When BUCK type circuit of LED works, by the temperature-compensating in control unit 14, environment can be reduced
The forward voltage of N-type double pole triode reduces generated influence when temperature increases, and control unit 14 is made to be sent out in environment temperature
It still can steadily work when raw fluctuation so that control unit 14 is more stable to the control of N type switch tube 13, so as to
So that electric current of light emitting diode is more stable in the case of this；By the Voltage Feedback in control unit 14, when power grid input
When alternating voltage increases, control unit 14 can turn off N type switch tube 13 in time, can reduce the wave of voltage in power grid in this way
The influence of the dynamic electric current to light emitting diode, so that the electric current of the light emitting diode in the case of this is more stable.
Fig. 3 is the structural schematic diagram of another kind BUCK type circuit of LED provided in an embodiment of the present invention.Such as Fig. 3 institutes
Show, on the basis of Fig. 2, further, described control unit 14 is additionally operable to control the conducting of the N type switch tube；The control
Unit 14 processed includes the shutdown subelement 142 that subelement 141 is connected and is connect with the conducting subelement 141, wherein described to lead
Logical subelement 141 is used to control the conducting of the N type switch tube 13, the shutdown subelement 142 be used for by temperature-compensating with
Voltage Feedback controls the shutdown of the N type switch tube 13, and the shutdown subelement 142 is to including Darlington transistor.
The shutdown of the N type switch tube 13 is controlled by turning off temperature-compensating and the Voltage Feedback of subelement 142, works as electricity
When the alternating voltage of net input occurs to fluctuate or environment temperature fluctuates, it can reduce to the light emitting diode in circuit
The influence of electric current, so as to so that the electric current of light emitting diode is more stable.
Fig. 4 is a kind of circuit diagram of BUCK types circuit of LED provided in an embodiment of the present invention.As shown in figure 4, excellent
Selection of land, the Darlington transistor QN in the shutdown subelement 142 include the first N-type triode Q1 and the second N-type triode Q2, described
First N-type triode Q1 and the second N-type triode Q2 is N-type double pole triode, the first N-type triode Q1's
Base stage of the base stage as the Darlington transistor QN, the collector of the first N-type triode Q1 and the second N-type triode Q2
Collector be connected together as the collector of the Darlington transistor QN, the emitter of the first N-type triode Q1 and institute
State the base stage connection of the second N-type triode Q2, the hair of the emitter of the second N-type triode Q2 as the Darlington transistor QN
Emitter-base bandgap grading；The shutdown subelement 142 further includes the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th
Resistance R8 and the 9th resistance R9, wherein the 8th resistance R8 is negative temperature coefficient (Negative Temperature
Coefficient, abbreviation NTC) thermistor；One end of the 4th resistance R4 is connect with the conducting subelement 141, described
The other end of 4th resistance R4 is connect with one end of one end of the 5th resistance R5 and the 6th resistance R6, the 5th electricity
The other end of resistance R5 is connect with one end of the base stage of the Darlington transistor QN and the 7th resistance R7, the 7th resistance R7's
The other end is connect with one end of the 8th resistance R8, the transmitting of the other end and the Darlington transistor QN of the 8th resistance R8
Pole connects together and is grounded, and the collector of the Darlington transistor QN is connect with the conducting subelement 141, the 6th resistance
The other end of R6 is connect with one end of the N type switch tube 13 and the 9th resistance R9, the other end of the 9th resistance R9
Ground connection.
It should be noted that when BUCK type circuit of LED works, the first N-type triode Q1 and the second N-type three
Pole pipe Q2 is operated in amplification region.In addition, for convenience described below, the other end for defining the 4th resistance R4 is first node
N1。
As shown in Figure 4, it is preferable that the conducting subelement 141 includes：First resistor R1, second resistance R2,3rd resistor
The auxiliary winding T12 of R3, the first capacitor C1, the first diode D1 and transformer, wherein one end of the first resistor R1 and institute
It states the first end of the auxiliary winding T11 of transformer to connect with one end of the 4th resistance R4 in the shutdown subelement 142, described the
The other end of one resistance R1 is connect with the first end of the first capacitor C1, the second end of the auxiliary winding T12 of the transformer
Ground connection, the second end of the first capacitor C2 and the Da Lin in one end of the second resistance R2, the shutdown subelement 142
The collector and the N type switch tube 13 of pipe QN connects, and the other end and the light emitting diode of the second resistance R2 return
Road unit 12 connects, the moon of one end of the 3rd resistor R3 and one end and the first diode D1 of the second resistance R2
Pole connects, the plus earth of the other end of the 3rd resistor R3 and the first diode D1.
As shown in figure 4, further, the N type switch tube 13 is third N-type triode Q3, the third N-type triode
The base stage of Q3 is connect with the second end of the first capacitor C1 in the conducting subelement 141, the third N-type triode Q3's
Emitter is connect with the other end of the 6th resistance R6 in the shutdown subelement 142, the current collection of the third N-type triode Q3
Pole is connect with the LED circuit unit 12.Wherein, the third N-type triode Q3 can be ambipolar three pole of N-type
Pipe.
It should be noted that third N-type triode Q3 is main power switch tube, work in BUCK type circuit of LED
When, third N-type triode Q3 is operated in HF switch state.
As shown in figure 4, further, the LED circuit unit 12 includes the first light emitting diode LD1, second
Light emitting diode LD2, the main winding T11 of transformer, the second capacitor C2 and the second diode D2；The main winding of the transformer
The first end of T11 and the cathode of the second light emitting diode LD2, the first end of the second capacitor C2 and conducting
The other end of second resistance R2 in unit 141 connects, the second end of the main winding T11 of the transformer and the third N-type
The collector of triode Q3 is connected with the anode of the second diode D2, the cathode and described first of the second diode D2
The anode of light emitting diode LD1, the second end of the second capacitor C2 and the pressure unit 11 connect, and described first shines
The cathode of diode LD1 is connect with the anode of the second light emitting diode LD2.
As shown in figure 4, further, the pressure unit 11 includes fuse FU, is made of four third diode D3
Rectifier bridge DA, third capacitor C3, inductor L1 and the tenth resistance R10, wherein the tenth resistance R10 be metal oxidation
Object varistor (Metal Oxide Varistor, abbreviation MOV)；The of one end of the fuse FU and the rectifier bridge DA
Three end A3 constitute the input terminal of the pressure unit 11, and the input terminal of the pressure unit 11 is for receiving the friendship inputted from power grid
Galvanic electricity presses VAC, the other end of the fuse FU to be connect with the first end A1 of the rectifier bridge DA, and the second of the rectifier bridge DA
End A2 is connect with one end of the inductor L1, the 4th end A4 ground connection of the rectifier bridge DA, the other end of the inductor L1
It is connect with one end of the first end of the third capacitor C3 and the tenth resistance R10, the second of the third capacitor C3
The other end of end and the tenth resistance R10 are grounded.
Next, being described further to the operation principle of BUCK types circuit of LED shown in Fig. 4.
The alternating voltage VAC of BUCK type circuit of LED is input to from power grid, by the inductance in pressure unit 11
The antihypertensive effect of L1 can be that the luminous of light emitting diode in LED circuit unit 12 provides operating voltage.When
When three N-type triode Q3 conductings, electric current passes through rectifier bridge DA, the first light emitting diode LD1, the second light emitting diode LD2, transformation
The main winding T11 and third N-type triode Q3 of device form conducting circuit；When third N-type triode Q3 is closed, the master of transformer
The energy stored in winding T11 is formed by the second diode D2, the first light emitting diode LD1 and the second light emitting diode LD2
Circuit carry out electric current release, this completes a cycle of the HF switch of BUCK type circuit of LED, and
And have continuous electric current on light emitting diode within this period and flow through, allow it to constantly luminous lighting.
When entire BUCK types circuit of LED is opened, the ideal base drive current of third N-type triode Q3 originally by
Second resistance R2 is provided, its subsequent ideal base drive current passes through the electricity of first resistor R1 and first by the auxiliary winding T12 of transformer
Container C1 is provided.The shutdown of third N-type triode Q3 is reached by what the first N-type triode Q1 and the second N-type triode Q2 were formed
Islington pipe QN is controlled.When Darlington transistor QN is connected, the ideal base drive current of third N-type triode Q3 can be discharged, from
And third N-type triode Q3 is made to close.Therefore, the turn-on time of control third N-type triode Q3 is to determine to flow through in circuit
The key point whether electric current of light emitting diode is stablized.
In the shutdown subelement 142 of control unit 14, the 5th resistance R5, the 7th resistance R7, the 8th resistance R8, the first N
Type triode Q1 and the second N-type triode Q2 form temperature-compensation circuit, and the operation principle of the circuit is as follows：As first node N1
Voltage when being more than (VBE1+VBE2) × (R5+R7+R8)/(R7+R8), Darlington transistor QN conducting controls third N-type triode
Q3 is turned off, wherein VBE1 represents the forward voltage of the BE knots of the first N-type triode Q1, and VBE2 represents the second N-type triode Q2's
The forward voltage of BE knots.When environment temperature increases, according to the characteristic of double pole triode, the forward voltage of BE knots can reduce,
That is VBE1+VBE2 can be reduced.Since R8 is negative tempperature coefficient thermistor, with the raising of environment temperature, the 8th resistance R8's
Resistance value can reduce, therefore, with the variation of environment temperature, the value of expression formula (VBE1+VBE2) × (R5+R7+R8)/(R7+R8)
It is approximately steady state value, when the voltage of first node N1 can in this way still ensured that in varying environment temperature in identical voltage value
So that Darlington transistor QN is connected, and third N-type triode Q3 is made to turn off.Pass through above-mentioned temperature compensation function so that different
Under environment temperature, third N-type triode Q3 remains to keep essentially identical turn-on time, to reduce the fluctuation of environment temperature
Influence to the electric current of light emitting diode in BUCK type circuit of LED.
In the shutdown subelement 142 of control unit 14, the 4th resistance R4, the 6th resistance R6 and the 9th resistance R9 composition electricity
Pressure feedback circuit, the operation principle of the voltage feedback circuit are：When the alternating voltage of power grid input increases, and third at this time
The Q3 conductings of N-type triode, the voltage of the auxiliary winding T12 of transformer can increase, and can make first node N1 by the 4th resistance R4
Voltage increases, and the raising of the voltage of first node N1 can be such that Darlington transistor QN is connected, so as to so that third N-type triode Q3
It turns off in time, to reduce the shadow of voltage fluctuation of the electric current of light emitting diode in BUCK type circuit of LED in by power grid
It rings；In addition, the 9th resistance R9 can also detect the emitter current of third N-type triode Q3, and the electric current in the 9th resistance
The voltage generated on R9 is applied to first node N1 by the 6th resistance R6, to control the shutdown of third N-type triode Q3, to
Voltage fluctuation of the electric current of light emitting diode in BUCK type circuit of LED in by power grid, which can also be reduced, to be influenced.
BUCK types circuit of LED provided in an embodiment of the present invention, passes through the temperature-compensating of the control unit in circuit
The shutdown of N type switch tube is controlled with Voltage Feedback, wherein temperature-compensating can be such that control unit is fluctuated in environment temperature
When can control the shutdown of N type switch tube more stablely, Voltage Feedback can make the alternating current that control unit is inputted in power grid
The shutdown of N type switch tube can be controlled when pressure life fluctuation more in time, in this way when wave occurs for the alternating voltage of power grid input
When dynamic or environment temperature fluctuates, the influence of the electric current to the light emitting diode in circuit can be reduced, so as to so that
The electric current of light emitting diode is more stable.
Note that above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The present invention is not limited to specific embodiments described here, can carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out to the present invention by above example
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
May include other more equivalent embodiments, and the scope of the present invention is determined by scope of the appended claims.
Claims (7)
1. a kind of BUCK types circuit of LED, which is characterized in that including：Pressure unit, LED circuit unit, N
Type switching tube and control unit, wherein
The pressure unit is for being depressured the alternating voltage for being input to BUCK type circuit of LED from power grid；
The LED circuit unit includes at least one light emitting diode, the LED circuit unit with it is described
Pressure unit is connected with the N type switch tube, and so that the light emitting diode is continued in the case where the N type switch tube turns off
It shines；
Described control unit includes the Darlington transistor being made of two N-type double pole triodes, described control unit and the N-type
Switching tube is connected with the LED circuit unit, and described control unit is by temperature-compensating and Voltage Feedback to control
State the shutdown of N type switch tube；
Described control unit is additionally operable to control the conducting of the N type switch tube；Described control unit include conducting subelement and with
The shutdown subelement of the conducting subelement connection, wherein the conducting subelement is for controlling leading for the N type switch tube
Logical, the shutdown subelement is used to control the shutdown of the N type switch tube, the shutdown by temperature-compensating and Voltage Feedback
Subelement includes Darlington transistor；
The shutdown subelement further includes the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance and the 9th electricity
Resistance, wherein the 8th resistance is negative tempperature coefficient thermistor；One end of 4th resistance connects with the conducting subelement
It connecing, the other end of the 4th resistance is connect with one end of one end of the 5th resistance and the 6th resistance, and the described 5th
The other end of resistance is connect with one end of the base stage of the Darlington transistor and the 7th resistance, the other end of the 7th resistance
It is connect with one end of the 8th resistance, the other end of the 8th resistance is connected together with the emitter of the Darlington transistor
And be grounded, the collector of the Darlington transistor is connect with the conducting subelement, the other end and the N-type of the 6th resistance
Switching tube is connected with one end of the 9th resistance, the other end ground connection of the 9th resistance.
2. BUCK types circuit of LED according to claim 1, it is characterised in that：
Darlington transistor in the shutdown subelement includes the first N-type triode and the second N-type triode, first N-type three
Pole pipe and the second N-type triode are N-type double pole triode, are reached described in the base stage conduct of the first N-type triode
The base stage of Islington pipe, the collector of the first N-type triode connect together work with the collector of the second N-type triode
For the collector of the Darlington transistor, the emitter of the first N-type triode and the base stage of the second N-type triode connect
It connects, the emitter of the emitter of the second N-type triode as the Darlington transistor.
3. BUCK types circuit of LED according to claim 2, it is characterised in that：
The conducting subelement includes：First resistor, second resistance, 3rd resistor, the first capacitor, the first diode and transformation
The auxiliary winding of device, wherein one end of the first resistor and the first end of the auxiliary winding of the transformer and shutdown are single
One end of the 4th resistance in member connects, and the other end of the first resistor is connect with the first end of first capacitor, institute
State the second end ground connection of the auxiliary winding of transformer, it is the second end of first capacitor and one end of the second resistance, described
The collector of Darlington transistor in shutdown subelement is connected with the N type switch tube, the other end of the second resistance with it is described
LED circuit unit connects, the one end and first diode of one end of the 3rd resistor with the second resistance
Cathode connection, the plus earth of the other end of the 3rd resistor and first diode.
4. BUCK types circuit of LED according to claim 3, which is characterized in that the N type switch tube is the 3rd N
Type triode, the base stage of the third N-type triode are connect with the second end of the first capacitor in the conducting subelement, institute
The emitter for stating third N-type triode is connect with the other end of the 6th resistance in the shutdown subelement, the third N-type three
The collector of pole pipe is connect with the LED circuit unit.
5. BUCK types circuit of LED according to claim 4, which is characterized in that the LED circuit list
Member includes the first light emitting diode, the second light emitting diode, the main winding of transformer, the second capacitor and the second diode；
The first of the cathode of the first end of the main winding of the transformer and second light emitting diode, second capacitor
The other end of second resistance in end and the conducting subelement connects, the second end of the main winding of the transformer and described the
The collector of three N-type triodes is connected with the anode of second diode, the cathode of second diode and described first
The anode of light emitting diode, second capacitor second end connected with the pressure unit, first light emitting diode
Cathode connect with the anode of second light emitting diode.
6. BUCK types circuit of LED according to claim 5, which is characterized in that the pressure unit includes insurance
Silk, rectifier bridge, third capacitor, inductor and the tenth resistance being made of four third diodes, wherein the tenth resistance
For metal oxide varistor；
One end of the fuse and the third end of the rectifier bridge constitute the input terminal of the pressure unit, the pressure unit
Input terminal for receiving alternating voltage input from power grid, the first end company of the other end of the fuse and the rectifier bridge
It connects, the second end of the rectifier bridge is connect with one end of the inductor, the 4th end ground connection of the rectifier bridge, the inductor
The other end connect with one end of the first end of the third capacitor and the tenth resistance, the second of the third capacitor
The other end of end and the tenth resistance is grounded.
7. BUCK types circuit of LED according to claim 4, which is characterized in that the third N-type triode is N
Type double pole triode.
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| CN201410444388.4A CN105451408B (en) | 2014-09-02 | 2014-09-02 | A kind of BUCK types circuit of LED |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010131889A2 (en) * | 2009-05-11 | 2010-11-18 | 전자부품연구원 | Light-emitting diode driving circuit and driving method |
| CN102244955A (en) * | 2010-05-14 | 2011-11-16 | 皇家飞利浦电子股份有限公司 | Adaptive circuit |
| CN103108438A (en) * | 2011-11-15 | 2013-05-15 | 东林科技股份有限公司 | Light source supplying module |
| CN103889116A (en) * | 2014-03-14 | 2014-06-25 | 浙江生辉照明有限公司 | LED driving circuit composed of discrete devices |
| CN104023455A (en) * | 2014-06-27 | 2014-09-03 | 电子科技大学 | LED (light emitting diode) constant-current drive circuit based on BJT (bipolar junction transistor) switch tube |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5887524B2 (en) * | 2011-04-19 | 2016-03-16 | パナソニックＩｐマネジメント株式会社 | Power supply |
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2014
- 2014-09-02 CN CN201410444388.4A patent/CN105451408B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010131889A2 (en) * | 2009-05-11 | 2010-11-18 | 전자부품연구원 | Light-emitting diode driving circuit and driving method |
| CN102244955A (en) * | 2010-05-14 | 2011-11-16 | 皇家飞利浦电子股份有限公司 | Adaptive circuit |
| CN103108438A (en) * | 2011-11-15 | 2013-05-15 | 东林科技股份有限公司 | Light source supplying module |
| CN103889116A (en) * | 2014-03-14 | 2014-06-25 | 浙江生辉照明有限公司 | LED driving circuit composed of discrete devices |
| CN104023455A (en) * | 2014-06-27 | 2014-09-03 | 电子科技大学 | LED (light emitting diode) constant-current drive circuit based on BJT (bipolar junction transistor) switch tube |
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| CN105451408A (en) | 2016-03-30 |
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