CN104661399B - A kind of constant current driver circuit for LED based on DC/DC voltage raising and reducings - Google Patents
A kind of constant current driver circuit for LED based on DC/DC voltage raising and reducings Download PDFInfo
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- CN104661399B CN104661399B CN201410446508.4A CN201410446508A CN104661399B CN 104661399 B CN104661399 B CN 104661399B CN 201410446508 A CN201410446508 A CN 201410446508A CN 104661399 B CN104661399 B CN 104661399B
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Abstract
Circuit, DC/DC buck-boost modes switching circuit, DC/DC boost control circuits, LED illumination unit, current sampling circuit and single chip machine controlling circuit are automatically generated the invention discloses a kind of constant current driver circuit for LED based on DC/DC voltage raising and reducings, including power switch, low pressure/ultralow pressure supplying channels, DC/DC voltage reduction circuits, voltage detecting circuit, boostrap circuit, lifting voltage inductance, internal work power supply.The characteristics of constant current driver circuit for LED of the present invention has constant current output, it is adaptable to which the series and parallel of more piece super capacitor is used.
Description
Technical field
DC/DC voltage boosting-reducing constant current driver circuit for LED is based on the present invention relates to one kind, belongs to the driving of DC/DC LED constant currents
Technical field.
Background technology
At present, global energy shortage worry raise once again, save the energy be we face in future it is important the problem of.
And ultracapacitor (farad capacitor, gold electric capacity) is that the one kind grown up in recent years being capable of massive store electricity
Can, and be a kind of new type of energy storage device between capacitor and battery with high-power charge and discharge characteristic, by with
Efficient LED coordinates, and can be widely used in emergency lighting and portable lighting field.
Ultracapacitor has the following advantages that compared with present rechargeable battery；It is safe, extra long life, green ring
Protect, good cryogenic property, power density is high.Wherein minimum discharge voltage can be that any battery is incomparable close to 0V.
Therefore Width funtion, the voltage boosting-reducing constant current driver circuit for LED of ultra low voltage work are researched and developed in field of LED illumination to be put in work
A new problem in face of Cheng Shi.
At present, the LED drive chip of its offer of the manufacturer of many DC/DC LED drive chips is primarily directed to common
Battery designed as power supply, the voltage range that its DC/DC decompression constant-current drive circuits are used is generally at tens volts to several
Volt, the minimum operating voltage of DC/DC voltage increase and current constant driving circuits is usual more than 0.8 volt, DC/DC synchronization ascending, descending volt circuits
Normal working voltage scope is generally at 2 volts to 5 volts, therefore for the ultracapacitor that multistage series and parallel is used, ideal state from
Work 0 volt and rise to the current still blank of DC/DC voltage boosting-reducings constant current driver circuit for LED of more than ten volts or so energy normal works.
The content of the invention
A kind of LED constant current based on DC/DC voltage boosting-reducings is provided the present invention seeks to the defect existed for prior art
Drive circuit.
The present invention to achieve the above object, is adopted the following technical scheme that：A kind of LED constant current based on DC/DC voltage boosting-reducings
Drive circuit, including power switch, low pressure/ultralow pressure supplying channels, DC/DC voltage reduction circuits, voltage detecting circuit, bootstrapping
Circuit, lifting voltage inductance, internal work power supply automatically generate circuit, DC/DC buck-boost modes switching circuit, DC/DC boosting controls
Circuit processed, LED illumination unit, current sampling circuit and single chip machine controlling circuit；
The power switch, its input is connected with ultracapacitor, and its output end is powered logical with low pressure/ultralow pressure respectively
Road, DC/DC voltage reduction circuits and voltage detecting circuit connection；The output end of the DC/DC voltage reduction circuits respectively with
Lift voltage inductance and boostrap circuit connection；It is described lifting voltage inductance output end respectively with DC/DC buck-boost mode switching circuits
Circuit connection is automatically generated with internal work power supply；The boostrap circuit and the internal work power supply automatically generate the defeated of circuit
Go out end to be connected with low pressure/ultralow pressure supplying channels；The output end of the low pressure/ultralow pressure supplying channels connects with lifting voltage inductance
Connect；The output end of the voltage detecting circuit respectively with DC/DC boost control circuits and DC/DC buck-boost mode switching circuits
Connection；The DC/DC boost control circuits and the internal work power supply automatically generate the output end of circuit with the DC/DC
Buck-boost mode switching circuit is connected；The output end of the DC/DC buck-boost modes switching circuit is connected with LED illumination unit；
The output end of the LED illumination unit is connected with current sampling circuit；The control signal of the single chip machine controlling circuit and electricity
Source switch is connected, and its control output end is connected with DC/DC boost control circuits and DC/DC voltage reduction circuits respectively；Wherein, institute
State single chip machine controlling circuit and DC/DC boost control circuits and power supply is drawn at LED illumination unit.
Further, the low pressure/ultralow pressure supplying channels include voltage detector U5, resistance R6, PMOS Q2, NMOS
Pipe Q3, NMOS tube Q4 and electric capacity C3；The 3rd pin of the voltage detector U5 is connected to power switch S1 output end, and it the 2nd
Pin is connected to the earth terminal of circuit, and its 1st pin is connected by resistance R6 with PMOS Q2 grid；The PMOS Q2's
Output end of source electrode and NMOS tube the Q3 drain electrode with power switch S1 is connected；The drain electrode of the PMOS Q2, NMOS tube Q3
2nd pin of source electrode, NMOS tube Q4 source electrode and electric capacity C3 is connected with DC/DC the 6th pins for being depressured constant-current driven chip U1；
1st pin of the grid of the NMOS tube Q3, NMOS tube Q4 drain electrode and electric capacity C3 is connected with resistance R2 the 1st pin；Institute
The grid for stating NMOS tube Q4 is connected to DC/DC decompression constant-current driven chips U1 the 1st pin.
Further, the voltage detecting circuit includes voltage detector U4, resistance R7, NMOS tube Q7 and the pole of Schottky two
Pipe D7；The 3rd pin of the voltage detector U4 is connected with power switch S1 output end, and its 2nd pin is connected to circuit
Earth terminal, its 1st pin is connected by resistance R7 with NMOS tube Q7 grid；The source electrode of the NMOS tube Q7 is connected to circuit
Earth terminal, the grid of the drain electrode of the NMOS tube Q7 and Schottky diode D7 the 2nd pin with PMOS Q5 and Q6 is connected；
The 1st pin of the Schottky diode D7 is connected to DC/DC voltage increase and current constant driving chips U2 the 4th pin.
Further, the DC/DC voltage reduction circuits include DC/DC decompression constant-current driven chips U1, electric capacity C1, resistance
R1 and decompression sustained diode 3；The 1st pin of the DC/DC decompression constant-current driven chips U1 is connected to NMOS tube Q4 grid
Pole, its 2nd pin is connected to the earth terminal of circuit, and its 3rd pin is connected to LED light emitting diodes D9 the 2nd pin, and it the 4th
Pin and resistance R1 the 2nd pin are connected to Schottky diode D8 the 1st pin, its 5th pin and electric capacity C1 the 1st pin
And resistance R1 the 1st pin is all connected to power switch S1 output end, the of its 6th pin and decompression sustained diode 3
2 pins are connected to lifting voltage inductance L1 the 1st pin；The 1st pin and the electric capacity C1 of the decompression sustained diode 3
2nd pin is all connected to the earth terminal of circuit.
Further, the DC/DC boost control circuits include DC/DC voltage increase and current constant driving chips U2, resistance R11, electricity
Hold C11 and electric capacity C12；2nd pin of the 1st pin of the DC/DC voltage increase and current constants driving chip U2 and lifting voltage inductance L1 connects
Connect, its 2nd pin is connected to the earth terminal of circuit, its 3rd pin is connected to resistance R4 the 1st pin, its 4th pin and resistance
R11 the 2nd pin is connected to Schottky diode D7 the 1st pin, its 5th pin, the 6th pin, resistance R11 the 1st pin,
Electric capacity C11 the 1st pin and electric capacity C12 the 1st pin are all connected to light emitting diode D9 the 1st pin；The electric capacity C11's
2nd pin and electric capacity C12 the 2nd pin are all connected to the earth terminal of circuit.
Further, the boostrap circuit includes electric capacity C2 and switching diode D2；Draw the 1st of the switching diode D2
Pin is connected to power switch S1 output end, and its 2nd pin and electric capacity C2 the 1st pin drive core with DC/DC decompression constant currents
Piece U1 the 1st pin connection；The 2nd pin of the electric capacity C2 is connected to DC/DC decompression constant-current driven chips U1 the 6th pin.
Further, the DC/DC buck-boost modes switching circuit includes PMOS Q5, PMOS Q6 and the pole of Schottky two
Pipe D1；The 1st pin of the Schottky diode D1 is connected to lifting voltage inductance L1 the 2nd pin with PMOS Q5 source electrode,
Its 2nd pin and PMOS Q6 source electrode are connected to LED light emitting diodes D9 the 1st pin；The drain electrode of the PMOS Q5 with
PMOS Q6 drain electrode connection, the grid of the PMOS Q5 and PMOS Q6 grid are connected to NMOS tube Q7 drain electrode.
Further, the internal work power supply, which automatically generates circuit, includes Schottky diode D4, electric capacity C5, resistance
R5, electric capacity C4, voltage-regulator diode D10 and resistance R2；The 1st pin of the electric capacity C5, resistance R5 the 1st pin, electric capacity C4
1st pin and voltage-regulator diode D10 the 2nd pin are connected with Schottky diode D4 the 2nd pin, the pole of Schottky two
Pipe D4 the 1st pin is connected with lifting voltage inductance L1 the 2nd pin, the 2nd pin of the resistance R2, electric capacity C5 the 2nd pin,
Grid of resistance R5 the 2nd pin with PMOS Q5 and Q6 is connected, and resistance R2 the 1st pin is connected to NMOS tube Q4 leakage
Pole, electric capacity C4 the 2nd pin is connected to the earth terminal of circuit with voltage-regulator diode D10 the 1st pin.
Further, the current sampling circuit includes resistance R3 and resistance R4；The 1st pin of the resistance R3 is connected to
DC/DC decompression constant-current driven chips U1 the 3rd pin, resistance R3 the 2nd pin and resistance R4 the 1st pin are connected to DC/DC
Voltage increase and current constant driving chip U2 the 3rd pin, the 2nd pin of the resistance R4 is connected to the earth terminal of circuit.
Further, the single chip machine controlling circuit includes PMOS Q1, electric capacity C8, resistance R8, NMOS tube Q9, electric capacity
C9, resistance R10, single-chip microcomputer U3, resistance R9, NMOS tube Q8, Schottky diode D6, Schottky diode D8, electric capacity C6, electric capacity
C7, Schottky diode D5；The source electrode of the PMOS Q1 is connected with power switch S1 input, PMOS Q1 grid with
Power switch S1 output end connection；The grid of the 1st pin of the electric capacity C8, resistance R8 the 1st pin and NMOS tube Q9 is equal
Drain electrode with PMOS Q1 is connected；The 2nd pin, resistance R8 the 2nd pin, NMOS tube the Q9 source electrode and electric capacity of the electric capacity C8
C9 the 2nd pin is connected with the earth terminal of circuit；The drain electrode of the 1st pin and NMOS tube Q9 of the electric capacity C9, resistance R10
2nd pin is connected with single-chip microcomputer U3 the 1st pin；The 1st pin, electric capacity C6 the 1st pin, the electric capacity C7 of the resistance R10
The 5th pin with single-chip microcomputer U3 of the 1st pin, Schottky diode D5 the 2nd pin and resistance R9 the 1st pin connect
Connect；The 2nd pin of the resistance R9 is connected with single-chip microcomputer U3 the 4th pin；The 2nd pin of the electric capacity C6 and the of electric capacity C7
2 pins are connected with the earth terminal of circuit；The 1st pin of the Schottky diode D5 is connected to LED light emitting diodes D9's
1st pin；The grid of the NMOS tube Q8 is connected to single-chip microcomputer U3 the 3rd pin；The source electrode of the NMOS tube Q8 is connected to list
Piece machine U3 the 6th pin；The drain electrode of the NMOS tube Q8 and Schottky diode D6 the 2nd pin with Schottky diode D8
The 2nd pin connection；What the 1st pin of the Schottky diode D6 was connected to DC/DC voltage increase and current constant driving chips U2 the 4th draws
Pin, the 1st pin of the Schottky diode D8 is connected to DC/DC decompression constant-current driven chips U1 the 4th pin；The monolithic
Machine U3 the 2nd pin is connected to the earth terminal of circuit；Wherein, the electric capacity C6, electric capacity C7 and Schottky diode D5 constitute one
Individual power-off accumulation power supply.
The beneficial effect of invention：The characteristics of constant current driver circuit for LED of the present invention has constant current output, it is adaptable to many
The series and parallel of section super capacitor is used.In the circuit, pressing mold is lifted by devising low pressure/ultralow pressure supplying channels and DC/DC
Formula switching circuit so that traditional buck constant-current drive circuit can start work, the startup of whole circuit at lower voltages
Voltage is 0.9 volt, and its minimum operating voltage is to 0.6 volt, the characteristics of being worked with ultralow pressure.The electricity of the constant current driver circuit for LED
Source voltage is big using scope, the continuous normal work of 0.6 to more than ten volt.
Brief description of the drawings
The allomeric function structured flowchart of Fig. 1 present invention.
The integrated circuit schematic diagram of Fig. 2 present invention.
DC/DC decompressions control principle drawing in Fig. 3 present invention.
The DC/DC boosting rectifier control schematic diagrams of Fig. 4 present invention.
Embodiment
Shown in Fig. 1, it is related to a kind of constant current driver circuit for LED based on DC/DC voltage boosting-reducings, including it is power switch 2, low
Pressure/ultralow pressure supplying channels 3, DC/DC voltage reduction circuits 10, voltage detecting circuit 11, boostrap circuit 4, lifting voltage inductance 8,
Internal work power supply automatically generates circuit 5, DC/DC buck-boost modes switching circuit 6, DC/DC boost control circuits 7, LED illumination
Unit 13, current sampling circuit 12 and single chip machine controlling circuit 9；Power switch 2, its input is connected with ultracapacitor 1, its
Output end is connected with low pressure/ultralow pressure supplying channels 3, DC/DC voltage reduction circuits 10 and voltage detecting circuit 11 respectively；
The output end of DC/DC voltage reduction circuits 10 is connected with lifting voltage inductance 8 and boostrap circuit 4 respectively；Lift the output of voltage inductance 8
End automatically generates circuit 5 with DC/DC buck-boost modes switching circuit 6 and internal work power supply respectively and is connected；Boostrap circuit 4 and interior
The output end that portion's working power automatically generates circuit 5 is connected with low pressure/ultralow pressure supplying channels 3；Low pressure/ultralow pressure is powered logical
The output end in road 3 is connected with lifting voltage inductance 8；The output end of voltage detecting circuit 11 respectively with DC/DC boost control circuits 7 with
And DC/DC buck-boost modes switching circuit 6 is connected；DC/DC boost control circuits 7 and internal work power supply automatically generate circuit 5
Output end be connected with DC/DC buck-boost modes switching circuit 6；The output end of DC/DC buck-boost modes switching circuit 6 with
LED illumination unit 13 is connected；The output end of LED illumination unit 13 is connected with current sampling circuit 12；Single chip machine controlling circuit 9
Control signal is connected with power switch 2, and its control output end is controlled with DC/DC boost control circuits 7 and DC/DC decompressions respectively
Circuit 10 is connected；Wherein, the single chip machine controlling circuit 9 and DC/DC boost control circuits 7 draw at LED illumination unit 13
Go out power supply.
Fig. 2 is the schematic diagram of the integrated circuit of the present invention.It can be seen that low pressure/ultralow pressure supplying channels 3 include voltage
Detector U5, resistance R6, PMOS Q2, NMOS tube Q3, NMOS tube Q4 and electric capacity C3；Voltage detector U5 the 3rd pin connection
To power switch S1 output end, its 2nd pin is connected to the earth terminal of circuit, and its 1st pin passes through resistance R6 and PMOS
Q2 grid connection；Output end of the drain electrode of PMOS Q2 source electrode and NMOS tube Q3 with power switch S1 is connected；PMOS
Q2 drain electrode, NMOS tube Q3 source electrode, NMOS tube Q4 source electrode and electric capacity C3 the 2nd pin drive with DC/DC decompression constant currents
Dynamic chip U1 the 6th pin connection；1st pin of NMOS tube Q3 grid, NMOS tube Q4 drain electrode and electric capacity C3 is and resistance
R2 the 1st pin connection；NMOS tube Q4 grid is connected to DC/DC decompression constant-current driven chips U1 the 1st pin.
Wherein, voltage detecting circuit 11 includes voltage detector U4, resistance R7, NMOS tube Q7 and Schottky diode D7；
Voltage detector U4 the 3rd pin is connected with power switch S1 output end, and its 2nd pin is connected to the earth terminal of circuit, its
1st pin is connected by resistance R7 with NMOS tube Q7 grid；NMOS tube Q7 source electrode is connected to the earth terminal of circuit, NMOS tube
The grid of Q7 drain electrode and Schottky diode D7 the 2nd pin with PMOS Q5 and Q6 is connected；Schottky diode D7's
1st pin is connected to DC/DC voltage increase and current constant driving chips U2 the 4th pin.
Wherein, DC/DC voltage reduction circuits 10 include DC/DC decompression constant-current driven chips U1, electric capacity C1, resistance R1 and drop
Sustained diode 3 is pressed, DC/DC decompression constant-current driven chips U1 the 1st pin is connected to NMOS tube Q4 grid, its 2nd pin
The earth terminal of circuit is connected to, its 3rd pin is connected to LED light emitting diodes D9 the 2nd pin, its 4th pin and resistance R1
The 2nd pin be connected to Schottky diode D8 the 1st pin, its 5th pin and electric capacity C1 the 1st pin and resistance R1
1st pin is all connected to power switch S1 output end, and the 2nd pin of its 6th pin and decompression sustained diode 3 is connected to
Lift voltage inductance L1 the 1st pin；1st pin of the decompression sustained diode 3 and the 2nd pin of the electric capacity C1 connect
It is connected to the earth terminal of circuit.
Wherein, DC/DC boost control circuits 7 include DC/DC voltage increase and current constant driving chips U2, resistance R11, electric capacity C12 and
Electric capacity C11, DC/DC voltage increase and current constant driving chip U2 the 1st pin is connected with lifting voltage inductance L1 the 2nd pin, its 2nd pin
The earth terminal of circuit is connected to, its 3rd pin is connected to resistance R4 the 1st pin, its 4th pin and resistance R11 the 2nd pin
Schottky diode D7 the 1st pin is connected to, its 5th pin, the 6th pin, resistance R11 the 1st pin, 1st of electric capacity C2
Pin and electric capacity C11 the 1st pin are all connected to LED light emitting diodes D9 the 1st pin；Electric capacity C12 the 2nd pin and electric capacity
C11 the 2nd pin is all connected to the earth terminal of circuit.
Wherein, boostrap circuit 4 includes electric capacity C2 and switching diode D2；Switching diode D2 the 1st pin is connected to electricity
Source switch S1 output end, its 2nd pin and electric capacity C2 the 1st pin draw with the 1st of DC/DC decompression constant-current driven chips U1 the
Pin is connected；Electric capacity C2 the 2nd pin is connected to DC/DC decompression constant-current driven chips U1 the 6th pin.
Wherein, DC/DC buck-boost modes switching circuit 6 includes PMOS Q5, PMOS Q6 and Schottky diode D1；Xiao
Special based diode D1 the 1st pin and PMOS Q5 source electrode are connected to lifting voltage inductance L1 the 2nd pin, its 2nd pin with
PMOS Q6 source electrode is connected to LED light emitting diodes D9 the 1st pin；PMOS Q5 drain electrode connects with PMOS Q6 drain electrode
Connect, PMOS Q5 grid and PMOS Q6 grid are connected to NMOS tube Q7 drain electrode.
Wherein, internal work power supply, which automatically generates circuit 5, includes Schottky diode D4, electric capacity C5, resistance R5, electric capacity
C4, voltage-regulator diode D10 and resistance R2；Electric capacity C5 the 1st pin, resistance R5 the 1st pin, electric capacity C4 the 1st pin and steady
Pressure diode D10 the 2nd pin be connected with Schottky diode D4 the 2nd pin, Schottky diode D4 the 1st pin and
Lift voltage inductance L1 the 2nd pin connection, resistance R2 the 2nd pin, electric capacity C5 the 2nd pin, resistance R5 the 2nd pin with
PMOS Q5 and Q6 grid connection, resistance R2 the 1st pin are connected to NMOS tube Q4 drain electrode, electric capacity C4 the 2nd pin with
Voltage-regulator diode D10 the 1st pin is all connected to the earth terminal of circuit.
Wherein, current sampling circuit 12 includes resistance R3 and resistance R4；Resistance R3 the 1st pin is connected to DC/DC decompressions
Constant-current driven chip U1 the 3rd pin, resistance R3 the 2nd pin and resistance R4 the 1st pin are connected to the drive of DC/DC voltage increase and current constants
Dynamic chip U2 the 3rd pin, resistance R4 the 2nd pin is connected to the earth terminal of circuit.
Lifting voltage inductance 8 is made up of inductance L1.Inductance L1 the 1st pin is depressured the 6th of constant-current driven chip U1 with DC/DC
Pin is connected, and inductance L1 the 2nd pin is connected with DC/DC voltage increase and current constant driving chips U2 the 1st pin.
Wherein, single chip machine controlling circuit 9 includes PMOS Q1, electric capacity C8, resistance R8, NMOS tube Q9, electric capacity C9, resistance
R10, single-chip microcomputer U3, resistance R9, NMOS tube Q8, Schottky diode D6, Schottky diode D8, electric capacity C6, electric capacity C7, Xiao Te
Based diode D5；PMOS Q1 source electrode is connected with power switch S1 input, PMOS Q1 grid and power switch S1
Output end connection, the leakage of the grid of electric capacity C8 the 1st pin, resistance R8 the 1st pin and NMOS tube Q9 with PMOS Q1
Pole is connected, electric capacity C8 the 2nd pin, resistance R8 the 2nd pin, NMOS tube Q9 source electrode and electric capacity C9 the 2nd pin with electricity
The earth terminal connection on road, the drain electrode of electric capacity C9 the 1st pin and NMOS tube Q9, resistance R10 the 2nd pin are with single-chip microcomputer U3's
1st pin connects, resistance R10 the 1st pin, electric capacity C6 the 1st pin, electric capacity C7 the 1st pin, Schottky diode D5
2nd pin, resistance R9 the 1st pin are connected with single-chip microcomputer U3 the 5th pin, and resistance R9 the 2nd pin is with single-chip microcomputer U3's
4th pin is connected, and electric capacity C6 the 2nd pin and electric capacity C7 the 2nd pin are connected with the earth terminal of circuit, Schottky diode
D5 the 1st pin is connected to LED light emitting diodes D9 the 1st pin.What NMOS tube Q8 grid was connected to single-chip microcomputer U3 the 3rd draws
Pin, NMOS tube Q8 source electrode is connected to single-chip microcomputer U3 the 6th pin, NMOS tube Q8 drain electrode and the 2nd of Schottky diode D6 the
Pin is connected with Schottky diode D8 the 2nd pin, and Schottky diode D6 the 1st pin is connected to DC/DC boosting perseverances
Driving chip U2 the 4th pin is flowed, Schottky diode D8 the 1st pin is connected to DC/DC decompression constant-current driven chips U1's
4th pin；Single-chip microcomputer U3 the 2nd pin is connected to the earth terminal of circuit；Wherein, the electric capacity C6, electric capacity C7 and Schottky two
Pole pipe D5 constitutes a power-off accumulation power supply；Because single-chip microcomputer has memory function, the power-off accumulation power supply can cause this
Single chip machine controlling circuit 9 is able to ensure that to single-chip microcomputer after a loss of power provides the working time that power supply maintains 5 seconds.
Wherein, power switch 2 is made up of power switch S1, power switch S1 input and the power end of ultracapacitor
Connection, power switch S1 output end is connected with DC/DC the 5th pins for being depressured constant-current driven chip U1.
Operationally, ultracapacitor 1 is as power supply by power switch 2 to electricity for the constant current driver circuit for LED of the present invention
Road provides power supply.Forward voltage drop VF values during LED normal works are in 3.0-3.5V, and we set according to LED forward voltage drop VF values
The switching point voltage of fixed its boosting and decompression is VQ=3.6V.Voltage detector U4 detection voltage is set as VQ values.Work as power supply
When voltage is higher than VQ values, DC/DC voltage reduction circuits 10 work, and the detection voltage of voltage detecting circuit 11 is higher than VQ values, DC/DC liters
Voltage-controlled circuit processed 7 is closed.Low pressure/ultralow pressure supplying channels 3 are also what is closed simultaneously, and boostrap circuit 4 drops to DC/DC
Voltage-controlled circuit processed 10 itself provides bootstrap voltage mode, while being used as the control voltage of low pressure ultralow pressure supplying channels 3.DC/DC is depressured
Control circuit 10 by lifting voltage inductance 8, then by DC/DC buck-boost modes switching circuit 6, then pass through LED illumination unit
13, then complete decompression work to current sampling circuit 12.Circuit 5 is wherein automatically generated by internal work power supply and produces internal work
Make voltage, provide voltage to low pressure/ultralow pressure supplying channels 3 all the way, another road is carried to DC/DC buck-boost modes switching circuit 6
Voltage supplied.
When supply voltage is less than VQ values, the detection voltage of voltage detecting circuit 11 is less than VQ values, opens DC/DC boosting rectifier controls
Circuit 7, boost mode is switched to by DC/DC buck-boost modes switching circuit 6.Now supply voltage is depressured by DC/DC and controlled
Circuit 10, by lifting voltage inductance 8, is controlled it by DC/DC boost control circuits 7 all the way；Another road passes through DC/DC
Buck-boost mode switching circuit 6, boosting work is completed by LED illumination unit 13, then by current sampling circuit 12.
When supply voltage is less than 2.8V, low pressure/ultralow pressure supplying channels 3 are opened, and replace DC/DC voltage reduction circuits
10, supply voltage directly provides power supply by low pressure/ultralow pressure supplying channels 3 to the part of DC/DC boost control circuits 7.Monolithic
Machine control circuit 9 is the control circuit of auxiliary, and switch the signal produced by power switch 2 carries out function control to single-chip microcomputer.
Forward voltage drop VF values during due to LED normal works are in 3.0-3.5V, and we are according to LED forward voltage drop VF values
The switching point voltage of its boosting and decompression is set as VQ=3.6V.Voltage detector U4 detection voltage is set as VQ values.
When voltage detector U4 the 3rd pin input voltage be higher than VQ values when, its 1st pin output voltage equal to its 3rd
Pin input voltage；When its 3rd pin input voltage is less than VQ values, its 1st pin output voltage is low level.
When voltage detector U4 the 3rd pin detects input voltage higher than VQ values, voltage detector U4 the 1st pin
Output voltage is equal to the 3rd pin input voltage；Voltage detector U4 the 1st pin is exported by grid of the resistance R7 to NMOS tube Q7
Pole provides high level, and NMOS tube Q7 is turned on, and when NMOS tube Q7 is turned on, PMOS Q5 is given in NMOS tube Q7 drain electrode, PMOS Q6's
Grid provides low level, PMOS Q5, PMOS Q6 conducting, by Schottky diode D1 short circuits.Now, resistance R1, electric capacity C1,
DC/DC decompressions constant-current driven chip U1, switching diode D2, electric capacity C2, decompression sustained diode 3, inductance L1, PMOS Q5,
It is permanent that PMOS Q6, light emitting diode D9, electric capacity C11, resistance R3 and resistance R4 composition DC/DC reduction voltage loops carry out DC/DC decompressions
Stream mode works.Referring to Fig. 3.
When input voltage is less than VQ values, voltage detector U4 the 1st pin exports low level, and the of voltage detector U4
1 pin provides low level, NMOS tube Q7 cut-offs, PMOS Q5 and PMOS Q6 cut-offs by resistance R7 to NMOS tube Q7 grid.
Wherein it is higher than 2.8V in supply voltage, during less than VQ values, the supply voltage of DC/DC boost control circuits is depressured constant current by DC/DC
Driving chip U1 6 pin are provided, and are represented below the 6th pin for being depressured chip with Pin 6.Pin 6, inductance L1, resistance R11, electricity
Hold C12, DC/DC voltage increase and current constant driving chip U2, Schottky diode D1, electric capacity C11, light emitting diode D9 and resistance R4 compositions
DC/DC boostings loop carries out the work of DC/DC voltage increase and current constants pattern.Referring to Fig. 4.
Now DC/DC reduction voltage circuits are not completely closed, but in a kind of collimation stream output state, are continued to pair
LED illumination unit provides portion of electrical current, but constant-current characteristics is ensured by being transformed into DC/DC booster circuits part.
When input voltage is less than 2.8V, DC/DC decompression constant-current driven chip U1 under-voltage lockings, DC/DC decompression constant currents are driven
Dynamic chip U1 the 6th pin also cannot provide power supply without output to DC/DC boost control circuits 7, DC/DC boostings now
The supply voltage of control circuit 7 is just provided by low pressure/ultralow pressure supplying channels 3.
During work, when voltage detector U5 the 3rd pin detects input voltage higher than 2.8V, the output of its 1st pin
Voltage is equal to the input voltage of the 3rd pin, and when its 3rd pin detects input voltage less than 2.8V, the output of its 1st pin is low
Level.So when voltage detector U5 the 3rd pin detects input voltage less than 2.8V, its 1st pin output low level,
Voltage detector U5 output pin provides low level by resistance R6 to PMOS Q2 grid, and PMOS Q2 GS voltages are met
Turn-on condition and turn on, formed power path powered to DC/DC boost control circuits；
When supply voltage is less than 1.5V, PMOS Q2 on state characteristic is deteriorated, and is turned on using NMOS tube Q3 and gives power supply shape
Into passage, it is ensured that the good low-voltage power supply characteristic of DC/DC boost control circuits.
When low voltage starting, PMOS Q2 conductings realize that low-voltage starts.
As can be seen from Figure 2, design NMOS tube Q3 is set to improve ultralow pressure working characteristics in the circuit of the present invention,
In order to not influence DC/DC to be depressured constant-current driven chip U1 normal work, control pipe NMOS tube Q4 is added, is dropped using DC/DC
The bootstrap voltage mode produced during the U1 work of pressure constant-current driven chip, it is ensured that the NMOS in DC/DC decompression constant-current driven chip U1 work
Pipe Q4 is in the conduction state, keeps NMOS tube Q3 GS voltages to be in cut-off state for 0 volt.Supply voltage works less than 2.8V
When, DC/DC decompression constant-current driven chips U1 the 6th pin is without output, NMOS tube Q4 cut-offs, NMOS tube Q3 conductings, for boosting electricity
The ultralow pressure work on road provides power supply.
In addition, it is necessary to which explanation is：Single-chip microcomputer U3 in the present invention is independent auxiliary control lines road, is only used for LED
The function control such as PWM darkenings.
During work, PMOS Q1, NMOS tube Q9 are combined into switch S1 condition discriminating signals.By single-chip microcomputer U3 the 1st pin
Input, then the 6th pin and the 3rd pin output control NMOS tube Q8 by single-chip microcomputer U3, it is logical when circuit is operated in DC/DC decompressions
Cross Schottky diode D8 and constant-current driven chip U1 progress PWM light modulations are depressured to DC/DC；When circuit is operated in DC/DC boostings,
PWM light modulations are carried out to DC/DC voltage increase and current constant driving chips U2 by Schottky diode D6.
When power switch S1 is connected, PMOS Q1 cut-offs, PMOS Q1 drain electrode provides low to NMOS tube Q9 grid
Level, NMOS tube Q9 cut-offs, single-chip microcomputer U3 the 1st pin is detected as high level.When power switch S1 disconnects, PMOS Q1's
Drain and provide high level to NMOS tube Q9 grid, NMOS tube Q9 conductings, single-chip microcomputer U3 the 1st pin is detected as low level.
When power switch S1 is connected, single-chip microcomputer U3 the 1st pin detects high level, first makes the 3rd pin and the 6th pin
High level is output as simultaneously, subsequently into Schema control, logical combination level is exported.
When power switch S1 disconnects, single-chip microcomputer U3 the 1st pin detects low level, makes the 3rd pin and the 6th pin same
When be output as low level, it is ensured that next time switch S1 connect can make DC/DC voltage boosting-reducings constant-current drive circuit enter work shape
State, subsequent single-chip microcomputer should be operated in micro energy lose state.Power-off accumulation power supply can cause the single chip machine controlling circuit after a loss of power
It is able to ensure that to single-chip microcomputer and the working time that power supply maintains 5 seconds is provided.
Presently preferred embodiments of the present invention is these are only, is not intended to limit the invention, it is all in the spirit and principles in the present invention
Within, any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (10)
1. a kind of constant current driver circuit for LED based on DC/DC voltage boosting-reducings, it is characterised in that including power switch (2), low
Pressure/ultralow pressure supplying channels (3), DC/DC voltage reduction circuits (10), voltage detecting circuit (11), boostrap circuit (4), lifting
Voltage inductance (8), internal work power supply automatically generate circuit (5), DC/DC buck-boost modes switching circuit (6), DC/DC boosting controls
Circuit (7) processed, LED illumination unit (13), current sampling circuit (12) and single chip machine controlling circuit (9)；
The power switch (2), its input is connected with ultracapacitor (1), and its output end is powered with low pressure/ultralow pressure respectively
Passage (3), DC/DC voltage reduction circuits (10) and voltage detecting circuit (11) connection；The DC/DC voltage reduction circuits
(10) output end is connected with lifting voltage inductance (8) and boostrap circuit (4) respectively；The output end point of the lifting voltage inductance (8)
Circuit (5) is not automatically generated with DC/DC buck-boost modes switching circuit (6) and internal work power supply to be connected；The boostrap circuit
(4) automatically generate the output end of circuit (5) with internal work power supply and be connected with low pressure/ultralow pressure supplying channels (3)；It is described low
The output end of pressure/ultralow pressure supplying channels (3) is connected with lifting voltage inductance (8)；The output end of the voltage detecting circuit (11)
It is connected respectively with DC/DC boost control circuits (7) and DC/DC buck-boost modes switching circuit (6)；The DC/DC boostings control
The output end that circuit (7) processed and the internal work power supply automatically generate circuit (5) switches with the DC/DC buck-boost modes
Circuit (6) is connected；The output end of the DC/DC buck-boost modes switching circuit (6) is connected with LED illumination unit (13), described
The output end of LED illumination unit (13) is connected with current sampling circuit (12)；The control input of the single chip machine controlling circuit (9)
End be connected with power switch (2), its control output end respectively with DC/DC boost control circuits (7) and DC/DC voltage reduction circuits
(10) connect；Wherein, the single chip machine controlling circuit (9) and DC/DC boost control circuits (7) are from LED illumination unit (13)
Draw power supply in place.
2. the constant current driver circuit for LED as claimed in claim 1 based on DC/DC voltage boosting-reducings, it is characterised in that described low
Pressure/ultralow pressure supplying channels (3) include voltage detector U5, resistance R6, PMOS Q2, NMOS tube Q3, NMOS tube Q4 and electric capacity
C3；The 3rd pin of the voltage detector U5 is connected to power switch S1 output end, and its 2nd pin is connected to connecing for circuit
Ground terminal, its 1st pin is connected by resistance R6 with PMOS Q2 grid；The leakage of the source electrode and NMOS tube Q3 of the PMOS Q2
Output end extremely with power switch S1 is connected；The drain electrode of the PMOS Q2, NMOS tube Q3 source electrode, NMOS tube Q4 source electrode
It is connected with electric capacity C3 the 2nd pin with DC/DC the 6th pins for being depressured constant-current driven chip U1；The grid of the NMOS tube Q3,
NMOS tube Q4 drain electrode and electric capacity C3 the 1st pin are connected with resistance R2 the 1st pin；The grid connection of the NMOS tube Q4
Constant-current driven chip U1 the 1st pin is depressured to DC/DC.
3. the constant current driver circuit for LED as claimed in claim 1 based on DC/DC voltage boosting-reducings, it is characterised in that the electricity
Pressure detection circuit (11) includes voltage detector U4, resistance R7, NMOS tube Q7 and Schottky diode D7；The voltage detector
U4 the 3rd pin is connected with power switch S1 output end, and its 2nd pin is connected to the earth terminal of circuit, and its 1st pin passes through
Resistance R7 is connected with NMOS tube Q7 grid；The source electrode of the NMOS tube Q7 is connected to the earth terminal of circuit, the NMOS tube Q7
Drain electrode and Schottky diode D7 grid of the 2nd pin with PMOS Q5 and Q6 be connected；The Schottky diode D7
The 1st pin be connected to DC/DC voltage increase and current constant driving chips U2 the 4th pin.
4. the constant current driver circuit for LED as claimed in claim 1 based on DC/DC voltage boosting-reducings, it is characterised in that the DC/
DC voltage reduction circuits (10) include DC/DC decompression constant-current driven chips U1, electric capacity C1, resistance R1 and decompression fly-wheel diode
D3；The 1st pin of the DC/DC decompression constant-current driven chips U1 is connected to NMOS tube Q4 grid, and its 2nd pin is connected to electricity
The earth terminal on road, its 3rd pin is connected to LED light emitting diodes D9 the 2nd pin, its 4th pin and resistance R1 the 2nd pin
Schottky diode D8 the 1st pin is connected to, its 5th pin and electric capacity C1 the 1st pin and resistance R1 the 1st pin are equal
Power switch S1 output end is connected to, the 2nd pin of its 6th pin and decompression sustained diode 3 is connected to lifting voltage inductance
L1 the 1st pin；1st pin of the decompression sustained diode 3 and the 2nd pin of the electric capacity C1 are all connected to circuit
Earth terminal.
5. the constant current driver circuit for LED as claimed in claim 1 based on DC/DC voltage boosting-reducings, it is characterised in that the DC/
DC boost control circuits (7) include DC/DC voltage increase and current constant driving chips U2, resistance R11, electric capacity C11 and electric capacity C12；The DC/
DC voltage increase and current constant driving chips U2 the 1st pin is connected with lifting voltage inductance L1 the 2nd pin, and its 2nd pin is connected to circuit
Earth terminal, its 3rd pin is connected to resistance R4 the 1st pin, and its 4th pin and resistance R11 the 2nd pin are connected to Xiao Te
Based diode D7 the 1st pin, its 5th pin, the 6th pin, resistance R11 the 1st pin, electric capacity C11 the 1st pin and electric capacity
C12 the 1st pin is all connected to light emitting diode D9 the 1st pin；The 2nd pin of the electric capacity C11 and the 2nd of electric capacity C12 the
Pin is all connected to the earth terminal of circuit.
6. the constant current driver circuit for LED based on DC/DC voltage boosting-reducings as claimed in claim 1, it is characterised in that it is described from
Lifting circuit (4) includes electric capacity C2 and switching diode D2；The 1st pin of the switching diode D2 is connected to power switch S1's
Output end, its 2nd pin and electric capacity C2 the 1st pin are connected with DC/DC the 1st pins for being depressured constant-current driven chip U1；Institute
The 2nd pin for stating electric capacity C2 is connected to DC/DC decompression constant-current driven chips U1 the 6th pin.
7. the constant current driver circuit for LED as claimed in claim 1 based on DC/DC voltage boosting-reducings, it is characterised in that the DC/
DC buck-boost modes switching circuit (6) includes PMOS Q5, PMOS Q6 and Schottky diode D1；The Schottky diode
D1 the 1st pin is connected to lifting voltage inductance L1 the 2nd pin with PMOS Q5 source electrode, and its 2nd pin is with PMOS Q6's
Source electrode is connected to LED light emitting diodes D9 the 1st pin；The drain electrode of the PMOS Q5 is connected with PMOS Q6 drain electrode, institute
The grid of the grid and PMOS Q6 of stating PMOS Q5 is connected to NMOS tube Q7 drain electrode.
8. the constant current driver circuit for LED as claimed in claim 1 based on DC/DC voltage boosting-reducings, it is characterised in that in described
Portion's working power, which automatically generates circuit (5), includes Schottky diode D4, electric capacity C5, resistance R5, electric capacity C4, voltage-regulator diode
D10 and resistance R2；The 1st pin, resistance R5 the 1st pin, electric capacity C4 the 1st pin and voltage-regulator diode of the electric capacity C5
D10 the 2nd pin is connected with Schottky diode D4 the 2nd pin, Schottky diode D4 the 1st pin and lifting piezoelectricity
Feel L1 the 2nd pin connection；2nd pin of the 2nd pin of the resistance R2, electric capacity C5 the 2nd pin and resistance R5 with
PMOS Q5 and Q6 grid connection, resistance R2 the 1st pin are connected to NMOS tube Q4 drain electrode；Draw the 2nd of the electric capacity C4
Pin and voltage-regulator diode D10 the 1st pin are connected to the earth terminal of circuit.
9. the constant current driver circuit for LED as claimed in claim 1 based on DC/DC voltage boosting-reducings, it is characterised in that the electricity
Flowing sample circuit (12) includes resistance R3 and resistance R4；The 1st pin of the resistance R3 is connected to DC/DC decompression constant current driving cores
Piece U1 the 3rd pin, resistance R3 the 2nd pin and resistance R4 the 1st pin are connected to DC/DC voltage increase and current constant driving chips U2's
3rd pin, the 2nd pin of the resistance R4 is connected to the earth terminal of circuit.
10. the constant current driver circuit for LED as claimed in claim 1 based on DC/DC voltage boosting-reducings, it is characterised in that the list
Piece machine control circuit (9) includes PMOS Q1, electric capacity C8, resistance R8, NMOS tube Q9, electric capacity C9, resistance R10, single-chip microcomputer U3, electricity
Hinder R9, NMOS tube Q8, Schottky diode D6, Schottky diode D8, electric capacity C6, electric capacity C7, Schottky diode D5；It is described
PMOS Q1 source electrode is connected with power switch S1 input, and PMOS Q1 grid connects with power switch S1 output end
Connect；Drain electrode of the grid of the 1st pin of the electric capacity C8, resistance R8 the 1st pin and NMOS tube Q9 with PMOS Q1 is connected；
The 2nd pin of the electric capacity C8, resistance R8 the 2nd pin, NMOS tube Q9 source electrode and electric capacity C9 the 2nd pin with circuit
Earth terminal is connected；2nd pin of the 1st pin of the electric capacity C9, NMOS tube Q9 drain electrode and resistance R10 is with single-chip microcomputer U3's
1st pin is connected；The 1st pin, electric capacity C6 the 1st pin, electric capacity C7 the 1st pin, the Schottky diode of the resistance R10
D5 the 2nd pin and resistance R9 the 1st pin are connected with single-chip microcomputer U3 the 5th pin；The 2nd pin of the resistance R9 with
Single-chip microcomputer U3 the 4th pin connection；The 2nd pin of the electric capacity C6 and electric capacity C7 the 2nd pin connect with the earth terminal of circuit
Connect；The 1st pin of the Schottky diode D5 is connected to LED light emitting diodes D9 the 1st pin；The grid of the NMOS tube Q8
Pole is connected to single-chip microcomputer U3 the 3rd pin；The source electrode of the NMOS tube Q8 is connected to single-chip microcomputer U3 the 6th pin；The NMOS
Pipe Q8 drain electrode and Schottky diode D6 the 2nd pin are connected with Schottky diode D8 the 2nd pin；The Schottky
Diode D6 the 1st pin is connected to DC/DC voltage increase and current constant driving chips U2 the 4th pin, the Schottky diode D8's
1st pin is connected to DC/DC decompression constant-current driven chips U1 the 4th pin；The 2nd pin of the single-chip microcomputer U3 is connected to circuit
Earth terminal；Wherein, the electric capacity C6, electric capacity C7 and Schottky diode D5 constitute a power-off accumulation power supply.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410446508.4A CN104661399B (en) | 2014-09-03 | 2014-09-03 | A kind of constant current driver circuit for LED based on DC/DC voltage raising and reducings |
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| CN201410446508.4A CN104661399B (en) | 2014-09-03 | 2014-09-03 | A kind of constant current driver circuit for LED based on DC/DC voltage raising and reducings |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105376891A (en) * | 2015-12-11 | 2016-03-02 | 成都翰道科技有限公司 | Multifunctional LED lamp intelligent control system |
| CN106411126B (en) * | 2016-11-28 | 2018-12-25 | 扬州工业职业技术学院 | A kind of portable laser booster power drive module |
| CN108696971B (en) * | 2017-04-07 | 2024-02-20 | 上海鸣志自动控制设备有限公司 | Control method of control system compatible with DALI and PWM dimming interface |
| CN110351924B (en) * | 2019-06-11 | 2021-11-23 | 浙江阳光照明灯具有限公司 | LED drive circuit with low standby power consumption |
| CN110445236B (en) * | 2019-07-30 | 2024-04-30 | 成都信息工程大学 | Energy conversion device and working method thereof |
| CN111210782A (en) * | 2020-03-10 | 2020-05-29 | 上海闻泰电子科技有限公司 | Synchronous rectification backlight driving circuit, electronic equipment and method |
| CN111698815B (en) * | 2020-05-14 | 2021-08-03 | 大茂伟瑞柯车灯有限公司 | Method for realizing LED voltage self-adaption based on voltage boosting and voltage reducing integrated circuit |
| CN114340085B (en) * | 2022-03-11 | 2022-06-10 | 浙江芯昇电子技术有限公司 | Photoelectric smoke sensor driving circuit and driving method thereof |
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|---|---|---|---|---|
| CN202392666U (en) * | 2011-11-30 | 2012-08-22 | 深圳建溢宝电子有限公司 | Emergency lamp |
| CN103956789A (en) * | 2014-04-25 | 2014-07-30 | 桂林市啄木鸟医疗器械有限公司 | Voltage stabilization power supply circuit of photo-curing machine LED lamp |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202392666U (en) * | 2011-11-30 | 2012-08-22 | 深圳建溢宝电子有限公司 | Emergency lamp |
| CN103956789A (en) * | 2014-04-25 | 2014-07-30 | 桂林市啄木鸟医疗器械有限公司 | Voltage stabilization power supply circuit of photo-curing machine LED lamp |
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Denomination of invention: A constant current LED driving circuit based on DC / DC boost Buck Effective date of registration: 20210819 Granted publication date: 20170829 Pledgee: China Construction Bank Corporation Changzhou Branch Pledgor: CHANGZHOU DONGCUN ELECTRONIC Co.,Ltd. Registration number: Y2021980007956 |