CN105517267B - A kind of constant current drive control device using bus current control circuit - Google Patents
A kind of constant current drive control device using bus current control circuit Download PDFInfo
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- CN105517267B CN105517267B CN201410497137.2A CN201410497137A CN105517267B CN 105517267 B CN105517267 B CN 105517267B CN 201410497137 A CN201410497137 A CN 201410497137A CN 105517267 B CN105517267 B CN 105517267B
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Abstract
The present invention relates to a kind of bus current control circuit to include branch resistance, branch road electric capacity and branch current source, and wherein branch resistance and branch road electric capacity are in parallel forms branch road, and branch road one end is connected between bus bar resistance and load, other end connection branch current source；To the adjustable electric current of branch road output size, the voltage sum on voltage and branch resistance on bus bar resistance keeps constant in branch current source.Wherein branch resistance occupies the portion voltage of bus bar resistance, and consecutive variations occur for the size of current for making to export on bus, i.e., when the electric current for flowing into branch road increases, the voltage that branch resistance takes increases, and the voltage on bus bar resistance reduces, so that bus current reduces.Because branch current is smoothly adjusted by branch current source, therefore the regulation to output current on bus is also smooth.Avoiding problems using in the prior art in SPWM ripples or dimmer switch circuit, because driving current is discontinuous and caused by stroboscopic phenomenon.
Description
Technical field
The present invention relates to a kind of LED actuation techniques, are driven more particularly to a kind of constant current using bus current control circuit
Movement controller.
Background technology
The invention of semiconductor device and application LED (Light-Emitting Diode) luminous efficiency and luminous intensity increasingly increase
By force, it is increasingly becoming light source of new generation.Current LED driving is mainly constant current driving, and constant-current drive circuit is by special
LED drive chip realize, to LED carry out brightness regulation when, in LED constant current driving chip add serial digital signal and
PWM (pulse width modulation) signal.This dimming controlling method adjusts power switch pipe in high-frequency inverter using PWM ripples
Pulse duty factor, realize the regulation of LED power outputs.
Its principle is：Power switch pipe is set to be operated in ZVS (ZVT) state when turning on, shutdown moment needs to use
Absorption Capacitance so can both enter ZVS working methods, while EMI (do by electromagnetism to reach ZCS (Zero Current Switch) working condition
Disturb) and the electric stress of power switch pipe can obviously reduce.But if the pulse duty factor of PWM ripples is too small, so that driving electricity
Stream is discontinuous, it will loses ZVS condition of work, causes LED stroboscopic situation occur.In addition, producing PWM ripples needs one
Individual external waveshape generating device, increase the complexity and cost of circuit.
The content of the invention
The defects of stroboscopic situation be present for constant current driver circuit for LED in the prior art, herein proposed it is a kind of by
Active leg is connected on bus, takes the pressure drop on bus bar resistance, so as to realize the bus current size progress to input load
Continuously adjustable bus current control circuit, the present invention propose the constant current drive control device using the circuit.
Technical scheme is as follows：
A kind of constant current drive control device using bus current control circuit, it is characterised in that：It includes bus current control
Circuit processed, the bus current control circuit includes branch resistance, branch road electric capacity and branch current source, wherein the branch resistance
With branch road electric capacity composition branch road in parallel；One end of the branch road is connected between bus bar resistance and load, described in other end connection
Branch current source；The branch current source is to the adjustable electric current of branch road output size；It also includes current constant control chip, mother
Line resistance, the second diode and accumulation of energy inductance, the current constant control chip include the first pressure measurement pin, the second pressure measurement pin and opened
Close pin；The both ends of the bus bar resistance connect power supply and the positive pole of load respectively, and the negative pole of load connects the accumulation of energy
One end of inductance, the other end of the accumulation of energy inductance connect the positive pole of second diode and the switch pin, and described the
One pressure measurement pin is connected between the bus bar resistance and the power supply；By branch road electricity in the bus current control circuit
One end of resistance and the branch road electric capacity branch road formed in parallel is connected between bus bar resistance and load, branch road other end connection described the
Two pressure measurement pins；Voltage on the bus bar resistance keeps constant with the voltage sum on the branch resistance.
The branch road electric capacity is 0.01~0.22 μ F, and the branch resistance is 0.5~2K Ω.
The branch current source is a constant-current source.
The constant-current source includes the first triode, the second triode, equivalent voltage input source, branch road power supply；It is wherein variable
Certain pin of resistance connects the branch road power supply, another base stage determined pin and connect first triode, moves pin connection
The base stage of second triode；The base stage of first triode is additionally attached to the base stage of second triode and described dynamic
Between pin, the colelctor electrode of first triode is in the base stage of oneself, grounded emitter；The current collection of second triode
Output of the pole as the constant-current source, grounded emitter.
First triode can be replaced the first diode, wherein the positive pole of first diode simultaneously with it is described another
Necessarily connected between pin and the base stage of second triode and the dynamic pin, the negative pole ground connection of first diode,
The equivalent voltage input source is variable resistor or other variable voltage input circuits.
It also includes first resistor and second resistance, and the first resistor is connected to base stage and the institute of second triode
State between pin；One end of the second resistance is connected between the first resistor and the base stage of second triode,
The other end is connected on another dynamic pin；The emitter stage of second triode passes through a resistance eutral grounding.
The emitter stage of second triode passes through a resistance eutral grounding；The first pressure measurement pin, the second pressure measurement pin are used
Voltage between the measurement bus bar resistance and the branch resistance.
The current constant control chip is switch mode constant current driving chip.
The first pressure measurement pin is the power input of the switch mode constant current driving chip.
The current constant control chip, bus bar resistance, the second diode and accumulation of energy inductance carry out hybrid package.
The technique effect of the present invention is as follows：
A kind of constant current drive control device of the present invention includes bus current control circuit, and bus current control circuit includes branch
Road resistance, branch road electric capacity and branch current source, wherein branch resistance and branch road electric capacity are in parallel to form branch road, and branch road one end is connected to
Between bus bar resistance and load, other end connection branch current source；Branch current source is female to the adjustable electric current of branch road output size
Voltage sum on voltage and branch resistance on line resistance keeps constant.Wherein branch resistance occupies the part of bus bar resistance
Consecutive variations occur for voltage, the size of current for making to export on bus, i.e., when the electric current for flowing into branch road increases, branch resistance takes
Voltage increase, the voltage on bus bar resistance reduces, so that bus current reduces.Because branch current is to pass through branch current
Source is smoothly adjusted, therefore the regulation to output current on bus is also smooth.Avoiding problems make in the prior art
With in SPWM ripples or dimmer switch circuit, because driving current is discontinuous and caused by stroboscopic phenomenon.
Because branch resistance and a larger branch road electric capacity are in parallel, no matter how the voltage on bus bar resistance changes, branch
The ohmically voltage in road is all tended towards stability, and the characteristic of bus circuit in itself will not be impacted.
As long as the bus current control circuit of the present invention is accessed in bus when in use, the external circuitses without complexity
And wave generator circuit, circuit design is simplified, reduces use cost, and it is convenient and reliable.The present invention may be applied not only to LED light
The intensification modulation in source, apply also for motor etc. other need carry out constant current driving field.
The branch current source of the present invention be constant-current source, its constant-current source including the first triode, the second triode, can power transformation
Resistance, branch road power supply；Wherein certain pin connection branch road power supply of variable resistor, another base determined pin and connect the first triode
Pole, move the base stage that pin connects the second triode；Output of the colelctor electrode of second triode as constant-current source, grounded emitter.
By the consecutive variations of the equivalent voltage input source as variable resistance, (0-10V exports defeated for lamp control variable voltage
Enter), the output current in adjustment branch current source, export the branch currents of consecutive variations.Because the present invention is in above-mentioned constant-current source
First resistor and second resistance are accessed, makes the voltage between the base stage of the second triode and earth point relative to the defeated of variable resistor
Go out the proportional decay of voltage, be advantageous to the fine setting of branch current, LED operating current can be accurately set, extend LED uses the longevity
Life.
A kind of constant current drive control device of the present invention, bus current control circuit is connected between bus bar resistance and load,
Input load bus current to be adjusted.So cause bus current control circuit and special current constant control chip phase
With reference to hybrid package together, is advantageous to element stability in use afterwards.
Brief description of the drawings
Fig. 1 is the structural representation of the LED constant current drive control device of the present invention
Fig. 2 is the constant current chip of the present invention to bus bar resistance voltage VRsRegulation schematic diagram
Fig. 3 is to bus bar resistance voltage V after occupancy after access leg of the present inventionRs' regulation schematic diagram
Fig. 4 is the preferred scheme structural representation of the branch road constant-current source of the present invention
Embodiment
The present invention will be described below in conjunction with the accompanying drawings.
As shown in figure 1, the LED constant current drive control device of the present invention mainly includes current constant control chip 1, bus current controls
Circuit, LED load 3, bus bar resistance Rs, diode D1, accumulation of energy inductance L1With power supply VDD.It is to open with current constant control chip 1
Exemplified by pass formula constant-current driven chip 6808, the main (power input of the first pressure measurement pin 11 for using the first current constant control chip 1
VIN), the second pressure measurement pin 12 (voltage sampling port CS) and switch pin 13 (switch terminals DIM).Power supply VDD output connects
Meet bus bar resistance RsOne end, bus bar resistance RsThe other end connection LED load 3 positive pole, LED load 3 negative pole connection accumulation of energy
Inductance L1One end, accumulation of energy inductance L1The other end connect diode D respectively1Positive pole and current constant control chip 1 switch pin
13, diode D1Negative pole be connected to bus bar resistance RsBetween power supply VDD.
Bus bar resistance RsBus current control circuit is connected between LED load 3.Bus current control circuit is included by propping up
Road resistance RaWith branch road electric capacity C1The branch road that parallel connection is formed, and the branch road constant-current source 2 for branch road power supply..One end connection of branch road
In bus bar resistance RsBeing connected between LED load 3, other end connection branch road constant-current source 2, branch road constant-current supply 2 is powered for branch road,
Branch current I is inputted for branch roadRa, in branch resistance RaUpper generation branch resistance voltage VRa.First pressure measurement pin 11 is connected to mother
Line resistance RsClose to power supply VDD one end, the second pressure measurement pin 12 connection other end of the branch road away from bus, the first pressure measurement
The pressure measurement pin 12 of pin 11 and second is used for bus bar resistance voltage V after measurement takesRs' and branch resistance voltage VRaSum.This reality
Apply the branch road electric capacity C in example1Preferably 0.01~0.22 μ F, preferably 0.1 μ F, can also 0.001 μ F, using general high-reliability
Ceramic condenser；Branch resistance RaFor 0.5~2K Ω, preferably 1K Ω.
As shown in Fig. 2 when the branch road constant-current source 2 of bus current control circuit is not to branch resistance RaThe branch road at place is defeated
Out branch electric current IRa, and when power supply VDD rigid connections enter in circuit.First pressure measurement pin 11 and the second pressure measurement pin 12 detect
Bus bar resistance voltage VRsLess than minimum rated voltage Vmin, switch pin 13 and open, bus bar resistance voltage VRs, LED load 3, store
Can inductance L1, current constant control chip 1 formed loop, bus bar resistance voltage VRsGradually rise, accumulation of energy inductance L1Charging.When constant current control
The the first pressure measurement pin 11 and the second pressure measurement pin 12 of coremaking piece 1 detect bus bar resistance voltage VRsHigher than maximum rated voltage
VmaxWhen, switch pin 13 is closed, accumulation of energy inductance L1Electric discharge, diode D1Conducting, bus bar resistance voltage VRs, LED load 3, accumulation of energy
Inductance L1, diode D1Form loop, bus bar resistance voltage VRsIt is gradually reduced.When the first pressure measurement pin of current constant control chip 1
11 and second pressure measurement pin 12 detect bus bar resistance voltage VRsMinimize rated voltage VminWhen, switch pin 13 is opened, weight
Multiple above-mentioned steps.By the control of current constant control chip 1, make the electric current I of the positive pole of input LED load 3RsTend to be constant, reach pair
The purpose of LED constant current driving.
As shown in figure 3, when the branch road constant-current source 2 of bus current control circuit is to branch resistance RaThe branch road output branch at place
Road electric current IRa, branch resistance RaTake bus bar resistance RsThe bus bar resistance voltage V at placeRs, make bus bar resistance voltage V after occupancyRs'+
Branch resistance voltage VRa=bus bar resistance voltage VRs, then in the pressure measurement pin 11 of current constant control chip 1 first and the second pressure measurement pin
Measured value between 12 is constant.As the branch current I that branch road constant-current source 2 exportsRaWhen consecutive variations occur for size, branch resistance electricity
Press VRaAlso linear change occurs therewith.As branch current IRaBecome big, branch resistance voltage VRaWhen becoming big, bus bar resistance after occupancy
Voltage VRs' diminish, so as to input the bus current I of the positive pole of LED load 3RsAlso diminish, LED brightness step-down；Conversely, work as branch road
Electric current IRaDiminish, input the bus current I of the positive pole of LED load 3RsBecome big, the brightness for causing LED is uprised.Pass through one with this
Ball bearing made realizes continuous, the smooth adjustment to LED luminance, the maximum rated voltage V after regulationmaxV is reduced to therewithmax', it is minimum
Rated voltage VminV is reduced to therewithmin'。
As shown in figure 4, the branch road constant-current source 2 of the present invention is preferably by the first triode 21, the second triode 22, first resistor
R1, second resistance R2, variable resistor Rt, branch road power supply 23 form constant-current source.Wherein variable resistor RtCertain pin connection branch
Road power supply 23, another base stage determined pin and connect the first triode 21, move pin connection first resistor R1One end；Second resistance
R2Both ends respectively with first resistor R1The other end and the first triode 21 base stage connection, and first resistor R1It is another
The base stage also with the second triode 22 is held to be connected；The colelctor electrode of first triode 21 is in the base stage of oneself, grounded emitter；The
Output of the colelctor electrode of two triodes 22 as branch road constant-current source 2, emitter stage pass through a resistance eutral grounding, the preferred 20K of the resistance
Ω.First resistor R in the present embodiment1For 300~600K Ω, preferably 400K Ω；Second resistance R2For 70~150K Ω, preferably
100KΩ。
First triode 21 can be replaced a diode, the wherein R of the positive pole of diode and variable resistortIt is another to draw surely
Pin connects, and the positive pole of diode is connected to the base stage of the second triode 22 and the R of variable resistor simultaneouslytBetween dynamic pin, two poles
The negative pole ground connection of pipe.
It should be pointed out that embodiment described above can make those skilled in the art that the present invention be more fully understood
Create, but do not limit the invention in any way is created.Therefore, although this specification is created with embodiment to the present invention referring to the drawings
Make and have been carried out being described in detail, it will be understood by those skilled in the art, however, that still can be modified to the invention
Or equivalent substitution, in a word, all do not depart from the technical scheme of the spirit and scope of the invention and its improvement, and it all should contain
Cover among the protection domain of the invention patent.
Claims (6)
- A kind of 1. constant current drive control device using bus current control circuit, it is characterised in that：It is controlled including bus current Circuit, the bus current control circuit include branch resistance, branch road electric capacity and branch current source, wherein the branch resistance and Branch road electric capacity is in parallel to form branch road；One end of the branch road is connected between bus bar resistance and load, and the other end connects the branch Road current source；The branch current source is to the adjustable electric current of branch road output size；It also includes current constant control chip, bus Resistance, the second diode and accumulation of energy inductance, the current constant control chip include the first pressure measurement pin, the second pressure measurement pin and switch Pin；The both ends of the bus bar resistance connect power supply and the positive pole of load respectively, and the negative pole of load connects the accumulation of energy electricity One end of sense, the positive pole and the switch pin of other end connection second diode of the accumulation of energy inductance, described second The other end of diode is connected between the first pressure measurement pin, the bus bar resistance and the power supply；Described first surveys Pressure pipe pin is connected between the bus bar resistance and the power supply；In the bus current control circuit by branch resistance and One end of the branch road electric capacity branch road in parallel formed is connected between bus bar resistance and load, and branch road other end connection described second is surveyed Pressure pipe pin；Voltage on the bus bar resistance keeps constant with the voltage sum on the branch resistance.
- 2. constant current drive control device as claimed in claim 1, it is characterised in that：The branch road electric capacity is 0.01~0.22 μ F, The branch resistance is 0.5~2K Ω.
- 3. constant current drive control device as claimed in claim 1 or 2, it is characterised in that：The branch current source is a constant-current source.
- A kind of 4. constant current drive control device as claimed in claim 1, it is characterised in that：The current constant control chip is switching regulator Constant-current driven chip.
- A kind of 5. constant current drive control device as claimed in claim 4, it is characterised in that：The first pressure measurement pin is opened to be described The power input of pass formula constant-current driven chip.
- A kind of 6. constant current drive control device as claimed in claim 1 or 2, it is characterised in that：The current constant control chip, bus Resistance, the second diode and accumulation of energy inductance carry out hybrid package.
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| CN201410497137.2A CN105517267B (en) | 2014-09-25 | 2014-09-25 | A kind of constant current drive control device using bus current control circuit |
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| CN201410497137.2A CN105517267B (en) | 2014-09-25 | 2014-09-25 | A kind of constant current drive control device using bus current control circuit |
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| CN105517267B true CN105517267B (en) | 2017-12-15 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711307A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Dimmable light-emitting diode (LED) drive circuit and lamp |
| CN103124461A (en) * | 2013-01-21 | 2013-05-29 | 厦门海莱照明有限公司 | LED linear intelligent dimming module |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US8552659B2 (en) * | 2007-08-07 | 2013-10-08 | Koninklijke Philips N.V. | Method and apparatus for discriminating modulated light in a mixed light system |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711307A (en) * | 2011-03-28 | 2012-10-03 | 海洋王照明科技股份有限公司 | Dimmable light-emitting diode (LED) drive circuit and lamp |
| CN103124461A (en) * | 2013-01-21 | 2013-05-29 | 厦门海莱照明有限公司 | LED linear intelligent dimming module |
Non-Patent Citations (1)
| Title |
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| CL6808_LED_Drivers;hanqimin05;《百度文库》;20100319;全文 * |
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Effective date of registration: 20171117 Address after: 518000 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A Applicant after: Nine judicious control technology (Shenzhen) Co., Ltd. Address before: Nanning City, the Guangxi Zhuang Autonomous Region Gaoxin road 530007 East No. 25 Incubator Building 1 building 107-B room Applicant before: NANNING CIHUI TECHNOLOGY CO., LTD. |
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Effective date of registration: 20200617 Address after: Room 906, 16W building, science and technology Avenue West, Pak Shek Kok Science Park, Hong Kong, China Patentee after: Delight Innovative Technologies Ltd. Address before: 518000 Guangdong city of Shenzhen province Qianhai Shenzhen Hong Kong cooperation zone before Bay Road No. 1 building 201 room A Patentee before: Nine wise control technology (Shenzhen) Co.,Ltd. |
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