CN105376899B - A kind of BUCK type circuit of LED - Google Patents
A kind of BUCK type circuit of LED Download PDFInfo
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- CN105376899B CN105376899B CN201410444620.4A CN201410444620A CN105376899B CN 105376899 B CN105376899 B CN 105376899B CN 201410444620 A CN201410444620 A CN 201410444620A CN 105376899 B CN105376899 B CN 105376899B
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Abstract
The invention discloses a kind of BUCK type circuit of LED, it include: pressure unit, LED circuit unit, p-type switching 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；Control unit includes the Darlington transistor being made of two p-type double pole triodes, and described control unit is connect with pressure unit and p-type switching tube, and the shutdown of p-type switching tube is controlled by temperature-compensating and Voltage Feedback；LED circuit unit includes at least one light emitting diode, and the LED circuit unit is connect with p-type switching tube and control unit, and makes the light emitting diode continue to shine in the case where the shutdown of p-type switching tube.BUCK type circuit of LED of the 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 type circuit of LED.
Background technique
BUCK type circuit, also referred to as Buck conversion circuit, the circuit can be depressured higher input voltage, so
Output gives the load of the circuit connection afterwards, operating voltage is provided for load, for example, BUCK type 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 type shines
Diode circuit includes: fuse FUS, the rectifier bridge being made of four first diode DS1, inductor LS1, first capacitor device
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 p-type
Pipe, and second transistor QS2 is used to control the shutdown of the first transistor QS1；In addition, the VAC expression in Fig. 1 is 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 as follows: when second transistor QS2 conducting, the ideal base drive current of the first transistor QS1 passes through second transistor
QS2 is discharged, so that the first transistor QS1 is turned off.According to the characteristic of double pole triode, when environment temperature increases, second
The voltage of BE (the base stage and emitter) knot of transistor QS2 can reduce, this will affect second transistor QS2 to the first transistor
The control of QS1, so that the electric current to light emitting diode generates large effect；When the alternating voltage VAC of power grid input increases,
Second transistor QS2 can not turn off the first transistor QS1 in time, to can also generate to the electric current of light emitting diode biggish
It influences.
In conclusion BUCK type 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.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of BUCK type 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 electric current of light emitting diode in circuit generates large effect, thus the technical issues of influencing the stability of its electric current.
The embodiment of the invention provides a kind of BUCK type circuit of LED, comprising: pressure unit, light emitting diode return
Road unit, p-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；
Described control unit includes the Darlington transistor being made of two p-type double pole triodes, described control unit and institute
It states pressure unit to connect with the p-type switching tube, described control unit controls the p-type by temperature-compensating and Voltage Feedback
The shutdown of switching tube；
The LED circuit unit includes at least one light emitting diode, the LED circuit unit with
The p-type switching tube is connected with described control unit, and makes the light emitting diode in the case where p-type switching tube shutdown
Continue to shine.
Further, described control unit is also used to control the conducting of the p-type switching tube；
Described control unit includes the shutdown subelement that subelement is connected and connect with the conducting subelement, wherein institute
The conducting that conducting subelement is used to control the p-type switching tube is stated, the shutdown subelement is used to pass through temperature-compensating and voltage
It feeds back to control the shutdown of the p-type switching tube, the shutdown subelement includes Darlington transistor.
Further, the Darlington transistor in the shutdown subelement includes the first p-type triode and the second p-type triode,
The first p-type triode and the second p-type triode are p-type double pole triode, the base of the first p-type triode
Base stage of the pole as the Darlington transistor, the collector of the collector of the first p-type triode and the second p-type triode
It is connected together as the collector of the Darlington transistor, the emitter of the first p-type triode and three pole of the second p-type
The base stage of pipe connects, emitter of the emitter of the second p-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
One end of the other end of resistance, the emitter of the Darlington transistor and the 9th resistance connect together and with conducting
Unit connection, the collector of the Darlington transistor are connect with the conducting subelement, the other end and the P of the 6th resistance
Type switching tube is connected with the other end of the 9th resistance.
Further, the conducting subelement includes: first resistor, second resistance, 3rd resistor, first capacitor device,
The auxiliary winding of one diode and transformer, wherein the first end of the auxiliary winding of one end of the first resistor and the transformer
It is connected with one end of the 4th resistance in the shutdown subelement, the other end of the first resistor and the first capacitor device
First end connection, the emitter and institute of the second end of the auxiliary winding of the transformer and the Darlington transistor in the shutdown subelement
Pressure unit connection is stated, in one end of the second end of the first capacitor device and the second resistance, the shutdown subelement
The collector of Darlington transistor is connected with the p-type switching tube, the other end of the second resistance and the LED circuit
Unit connection, one end of the 3rd resistor are connect with the anode of one end of the second resistance and the first diode, institute
The other end for stating 3rd resistor is connect with the second end of the cathode of the first diode and the auxiliary winding of the transformer.
Further, the p-type switching tube is third p-type triode, and the base stage of the third p-type triode is led with described
The second end connection of first capacitor device in logical subelement, the emitter of the third p-type triode and the shutdown subelement
In the 6th resistance other end connection, the collector of the third p-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 anode 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 p-type triode is connected with the cathode of second diode, the anode of second diode, described
The cathode of one light emitting diode is connected together and is grounded with the second end of second capacitor, first light emitting diode
Anode connect with the cathode of second light emitting diode.
Further, the pressure unit include fuse, the rectifier bridge, the third capacitor 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 used to receive 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
One end of the other end of sensor, the first end of the third capacitor and the tenth resistance connect together and with the conducting
The second end of the auxiliary winding of transformer in subelement connects, the second end of the third capacitor and the tenth resistance it is another
One end ground connection.
Further, the third p-type triode is p-type double pole triode.
BUCK type 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 p-type switching tube is controlled with Voltage Feedback, wherein temperature-compensating can be such that control unit fluctuates in environment temperature
When can control the shutdown of p-type switching tube, the alternating current that Voltage Feedback can be such that control unit inputs in power grid more stablely
The shutdown of p-type switching 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, can reduce the influence of the electric current to the light emitting diode in circuit, so as to so that
The electric current of light emitting diode is more stable.
Detailed description of the invention
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 type 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 type circuit of LED provided in an embodiment of the present invention.
Specific embodiment
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 limiting 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 type 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 type circuit of LED includes: decompression
Unit 11, LED circuit unit 12, p-type switching tube 13 and control unit 14, wherein the pressure unit 11 for pair
The alternating voltage for being input to BUCK type circuit of LED from power grid is depressured；Described control unit 14 includes by two P
The Darlington transistor that type double pole triode is constituted, described control unit 14 and the pressure unit 11 and the p-type switching tube 13
Connection, described control unit 14 control the shutdown of the p-type switching tube 13 by temperature-compensating and Voltage Feedback；It is described to shine
Diode circuit unit 12 includes at least one light emitting diode, and the LED circuit unit 12 is switched with the p-type
Pipe 13 and described control unit 14 connect, and continue the light emitting diode in the case where p-type switching tube 13 shutdown
It shines.
It should be noted that described control unit 14 controls p-type switching tube 13 by temperature-compensating and Voltage Feedback
Shutdown, wherein the part in control unit 14 with temperature compensation function can according to need the corresponding temperature-compensating electricity of setting
Realize that the part in control unit 14 with Voltage Feedback effect, which can according to need, is arranged corresponding voltage feedback circuit in road
To realize.
In the work of BUCK type circuit of LED, by the temperature-compensating in control unit 14, environment can reduce
The forward voltage of p-type double pole triode reduces generated influence when temperature increases, and sends out control unit 14 in environment temperature
It still can steadily work when raw fluctuation, so that control unit 14 is more stable to the control of p-type switching 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 p-type switching 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 institute
Show, on the basis of Fig. 2, further, described control unit 14 is also used to control the conducting of the p-type switching tube；The control
Unit 14 processed includes the shutdown subelement 142 that subelement 141 is connected and connect with the conducting subelement 141, wherein described to lead
Logical subelement 141 is used to control the conducting of the p-type switching tube 13, the shutdown subelement 142 be used for by temperature-compensating with
Voltage Feedback controls the shutdown of the p-type switching tube 13, and the shutdown subelement 142 includes Darlington transistor.
The shutdown of the p-type switching 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 type 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 p-type triode Q1 and the second p-type triode Q2, described
First p-type triode Q1 and the second p-type triode Q2 is p-type double pole triode, the first p-type triode Q1's
Base stage of the base stage as the Darlington transistor QN, the collector of the first p-type triode Q1 and the second p-type triode Q2
Collector be connected together as the collector of the Darlington transistor QN, the emitter of the first p-type triode Q1 and institute
State the base stage connection of the second p-type triode Q2, hair of the emitter of the second p-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, the Darlington transistor QN of the 8th resistance R8
Pole and one end of the 9th resistance R9 connect together and connect with the conducting subelement 141, the Darlington transistor QN's
Collector is connect with the conducting subelement 141, the other end of the 6th resistance R6 and the p-type switching tube 13 and described the
The other end of nine resistance R9 connects.
It should be noted that in the work of BUCK type circuit of LED, the first p-type triode Q1 and the second p-type three
Pole pipe Q2 works in amplification region.In addition, the other end for defining the 4th resistance R4 is first node for convenience described below
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, first capacitor device C1, 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 device C1, the second end of the auxiliary winding T12 of the transformer
It is connect with the emitter of the Darlington transistor QN in the shutdown subelement 142 and the pressure unit 11, the first capacitor device
One end of the second end of C2 and the second resistance R2, the collector for turning off the Darlington transistor QN in subelement 142 and institute
The connection of p-type switching tube 13 is stated, the other end of the second resistance R2 connect with the LED circuit unit 12, and described the
One end of three resistance R3 is connect with the anode of one end of the second resistance R2 and the first diode D1, the 3rd resistor
The other end of R3 is connect with the second end of the cathode of the first diode D1 and the auxiliary winding T12 of the transformer.
As shown in figure 4, further, the p-type switching tube 13 is third p-type triode Q3, the third p-type triode
The base stage of Q3 is connect with the second end of the first capacitor device C1 in the conducting subelement 141, the third p-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 p-type triode Q3
Pole is connect with the LED circuit unit 12.Wherein, the third p-type triode Q3 can be ambipolar three pole of p-type
Pipe.
It should be noted that third p-type triode Q3 is main power switch tube, work in BUCK type circuit of LED
When, third p-type triode Q3 works 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 anode of the first end of T11 and 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 p-type
The collector of triode Q3 is connected with the cathode of the second diode D2, the anode of the second diode D2, described first
The cathode of light emitting diode LD1 is connected together and is grounded with the second end of the second capacitor C2, and described first luminous two
The anode of pole pipe LD1 is connect with the cathode of the second light emitting diode LD2.
As shown in figure 4, further, the pressure unit 11 is formed including fuse FU, by 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 used to receive the friendship inputted from power grid
Galvanic electricity presses VAC, and the other end of the fuse FU is 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,
The first end of the third capacitor C3 and one end of the tenth resistance R10 connect together and with the conducting subelement
The second end of the auxiliary winding T12 of transformer in 141 connects, the second end of the third capacitor C3 and the tenth resistance
The other end of R10 is grounded.
Next, being described further to the working principle of BUCK type 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 provide operating voltage for the luminous of light emitting diode in LED circuit unit 12.When
When three p-type triode Q3 are connected, electric current by rectifier bridge DA, the 9th resistance R9, third p-type triode Q3, the master of transformer around
Group T11, the second light emitting diode LD2 and the first light emitting diode LD1 form conducting circuit；When third p-type triode Q3 is closed
When, the energy stored in the main winding T11 of transformer passes through the second light emitting diode LD2, the first light emitting diode LD1 and second
The circuit that diode D2 is formed carries out electric current release, and this completes the HF switch of BUCK type circuit of LED
A cycle, and have continuous electric current on light emitting diode within this period and flow through, allow it to the photograph that constantly shines
It is bright.
When entire BUCK type circuit of LED open when, the ideal base drive current of third p-type triode Q3 originally by
Second resistance R2 and 3rd resistor R3 is provided, its subsequent ideal base drive current passes through the first electricity by the auxiliary winding T12 of transformer
R1 and first capacitor device C1 is hindered to provide.The shutdown of third p-type triode Q3 is by three pole the first p-type triode Q1 and the second p-type
The Darlington transistor QN of pipe Q2 composition is controlled.It, can be by the base drive electricity of third p-type triode Q3 when Darlington transistor QN conducting
Stream discharges, so that third p-type triode Q3 be made to close.Therefore, the turn-on time for controlling third p-type triode Q3 is to determine stream
The whether stable key point of electric current through the light emitting diode in circuit.
In the shutdown subelement 142 of control unit 14, the 5th resistance R5, the 7th resistance R7, the 8th resistance R8, the first P
Type triode Q1 and the second p-type triode Q2 forms temperature-compensation circuit, and the working principle of the circuit is as follows: in Fig. 4 second
On the basis of the voltage of node N2, if it is assumed that the voltage of second node N2 is 0, then the voltage of first node N1, three pole of the first p-type
The forward voltage VBE2 of the BE knot of the forward voltage VBE1 and the second p-type triode Q2 of the BE knot of pipe Q1 is negative value.When first
When the voltage of node N1 is less than (VBE1+VBE2) × (R5+R7+R8)/(R7+R8), Darlington transistor QN conducting controls third p-type
Triode Q3 shutdown.When environment temperature increases, according to the characteristic of double pole triode, the forward voltage of BE knot can be reduced, i.e.,
VBE1+VBE2 can be reduced.Since R8 is negative tempperature coefficient thermistor, with the raising of environment temperature, the resistance of the 8th resistance R8
Value can reduce, and therefore, with the variation of environment temperature, expression formula (VBE1+VBE2) × (R5+R7+R8)/(R7+R8) value is close
Like being steady state value, the voltage of first node N1 can in this way made when still ensuring that in varying environment temperature in identical voltage value
Darlington transistor QN conducting, and turn off third p-type triode Q3.By above-mentioned temperature compensation function, so that in different rings
At a temperature of border, third p-type triode Q3 is still able to maintain essentially identical turn-on time, to reduce the fluctuation pair of environment temperature
The influence of 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
Press feed circuit, the working principle of the voltage feedback circuit are as follows: when the alternating voltage of power grid input increases, and third at this time
P-type triode Q3 conducting, the voltage of the auxiliary winding T12 of transformer can reduce, then make first node N1's by the 4th resistance R4
Voltage reduces, and the reduction of the voltage of first node N1 can be such that Darlington transistor QN is connected, so as to so that third p-type triode Q3
It turns off in time, to reduce shadow of the electric current by the voltage fluctuation in power grid of light emitting diode in BUCK type circuit of LED
It rings；In addition, the 9th resistance R9 can also detect the emitter current of third p-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 p-type triode Q3, thus
Also the electric current that can reduce light emitting diode in BUCK type circuit of LED is influenced by the voltage fluctuation in power grid.
BUCK type 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 p-type switching tube is controlled with Voltage Feedback, wherein temperature-compensating can be such that control unit fluctuates in environment temperature
When can control the shutdown of p-type switching tube, the alternating current that Voltage Feedback can be such that control unit inputs in power grid more stablely
The shutdown of p-type switching 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, can reduce the influence of the electric current to the light emitting diode in circuit, so as to so that
The electric current of light emitting diode is more stable.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to 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 by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (7)
1. a kind of BUCK type circuit of LED characterized by comprising pressure unit, LED circuit unit, P
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；
Described control unit includes the shutdown subelement that subelement is connected and connect with the conducting subelement, wherein the control
Unit processed is connect with the pressure unit and the p-type switching tube, and the conducting subelement is for controlling the p-type switching tube
Conducting, the shutdown subelement are used to control the shutdown of the p-type switching tube, the pass by temperature-compensating and Voltage Feedback
Disconnected subelement includes Darlington transistor, the shutdown subelement further include the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance,
8th resistance and the 9th 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 5th resistance of the 4th resistance
One end connected with one end of the 6th resistance, the other end of the 5th resistance and the base stage of the Darlington transistor and described
One end of 7th resistance connects, and the other end of the 7th resistance is connect with one end of the 8th resistance, the 8th resistance
The other end, the emitter of the Darlington transistor and one end of the 9th resistance connect together and with the conducting subelement
Connection, the collector of the Darlington transistor are connect with the conducting subelement, and the other end of the 6th resistance is opened with the p-type
The other end of 9th resistance described in Guan Guanhe connects；
The LED circuit unit includes at least one light emitting diode, the LED circuit unit with it is described
P-type switching tube is connected with described control unit, and continues the light emitting diode in the case where p-type switching tube shutdown
It shines.
2. BUCK type circuit of LED according to claim 1, it is characterised in that:
Darlington transistor in the shutdown subelement includes the first p-type triode and the second p-type triode, first p-type three
Pole pipe and the second p-type triode are p-type double pole triode, are reached described in the base stage conduct of the first p-type triode
The base stage of Islington pipe, the collector of the first p-type triode connect together work with the collector of the second p-type triode
For the collector of the Darlington transistor, the base stage of the emitter of the first p-type triode and the second p-type triode connects
It connects, emitter of the emitter of the second p-type triode as the Darlington transistor.
3. BUCK type circuit of LED according to claim 2, it is characterised in that:
The conducting subelement includes: first resistor, second resistance, 3rd resistor, first capacitor device, first diode and transformation
The auxiliary winding of device, wherein the first end and shutdown of the auxiliary winding of one end of the first resistor and the transformer 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 the first capacitor device, institute
The second end of the auxiliary winding of transformer is stated to connect with the emitter of the Darlington transistor in the shutdown subelement and the pressure unit
It connects, the second end of the first capacitor device and one end, the collection for turning off the Darlington transistor in subelement of the second resistance
Electrode is connected with the p-type switching tube, and the other end of the second resistance is connect with the LED circuit unit, described
One end of 3rd resistor is connect with the anode of one end of the second resistance and the first diode, the 3rd resistor it is another
One end is connect with the second end of the cathode of the first diode and the auxiliary winding of the transformer.
4. BUCK type circuit of LED according to claim 3, which is characterized in that the p-type switching tube is the 3rd P
Type triode, the base stage of the third p-type triode are connect with the second end of the first capacitor device in the conducting subelement, institute
The emitter for stating third p-type triode is connect with the other end of the 6th resistance in the shutdown subelement, the third p-type three
The collector of pole pipe is connect with the LED circuit unit.
5. BUCK type 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 anode 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 p-type triodes is connected with the cathode of second diode, the anode of second diode, first hair
The cathode of optical diode is connected together and is grounded with the second end of second capacitor, the sun of first light emitting diode
Pole is connect with the cathode of second light emitting diode.
6. BUCK type 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 be used to receive the alternating voltage inputted 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, the first end of the third capacitor and one end of the tenth resistance connect together and single with conducting
The second end of the auxiliary winding of transformer in member connects, the other end of the second end of the third capacitor and the tenth resistance
Ground connection.
7. BUCK type circuit of LED according to claim 4, which is characterized in that the third p-type triode is P
Type double pole triode.
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| CN201410444620.4A CN105376899B (en) | 2014-09-02 | 2014-09-02 | A kind of BUCK type circuit of LED |
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| CN105376899B true CN105376899B (en) | 2019-01-08 |
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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 CN201410444620.4A patent/CN105376899B/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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| CN105376899A (en) | 2016-03-02 |
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