CN102625528A - Constant-current control circuit and electronic equipment - Google Patents
- ️Wed Aug 01 2012
CN102625528A - Constant-current control circuit and electronic equipment - Google Patents
Constant-current control circuit and electronic equipment Download PDFInfo
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Publication number
- CN102625528A CN102625528A CN2012100651802A CN201210065180A CN102625528A CN 102625528 A CN102625528 A CN 102625528A CN 2012100651802 A CN2012100651802 A CN 2012100651802A CN 201210065180 A CN201210065180 A CN 201210065180A CN 102625528 A CN102625528 A CN 102625528A Authority
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- current control
- constant
- positive
- control circuit
- constant current Prior art date
- 2012-03-13 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
The invention is applicable in the field of control circuits and provides a constant-current control circuit and a piece of electronic equipment. The constant-current control circuit comprises a power supply conversion unit and a constant-current control unit which comprises an operational amplifier, a PMOS (P-channel Metal Oxide Semiconductor)tube, a PNP(P type semiconductor-N type semiconductor-P type semiconductor) power triode, a current detection resistor and a reference voltage source, forming a negative feedback circuit. Through the constant-current control circuit and the electronic equipment, the purpose of high-precision constant-current control to a load unit is realized and the problem that the current is difficult to control at high precision due to inconformity of the parameters of an existing power tube in the prior art is solved; the electronic equipment is more stable in performance; the service life of the electronic equipment is prolonged; and the electronic equipment is more energy-saving.
Description
Technical field
The present invention relates to the control circuit field, relate in particular to a kind of constant-current control circuit and electronic equipment.
Background technology
Because the performance requirement of components and parts or electronic system work; At present a lot of electronic equipments all need use constant-current control circuit; As as a kind of green light source of low-power consumption and be widely used in field LED such as illumination, demonstration backlight; Because its luminous particularity, the electric current that need flow through LED is constant relatively, and luminous ability is stable; Especially as the backlight of display screen, the size that requires to flow through every road series LED electric current especially is equal as far as possible, just can reach desirable display effect.
Commercial now constant-current control circuit generally all need utilize the relevant pressure drop of power tube (comprising NMOS, PMOS, NPN and PNP power tube) adjustment every road power tube, reaches the purpose that the adjustment electric current equates every road electric current.If power tube (comprising NMOS, PMOS, NPN and PNP power tube) is built-in, will increase chip area, thereby increase chip cost, the heat dissipation problem of power tube is difficult for solving in addition.So general solution is that power tube is external.
In the external power tube; Especially the highest with positive-negative-positive power tube cost performance; But because consistency, particularly positive-negative-positive power tube important parameters β value that the present manufacturing process of positive-negative-positive power tube is difficult to guarantee various parameters change very big along with the difference of technology, temperature, applied environment.So utilize the positive-negative-positive power tube as constant-current control circuit, bigger to the difficulty of Current Control.Therefore, there is the problem of Control current accurately that is difficult to that power tube causes owing to various parameters are inconsistent in prior art.
Summary of the invention
The object of the present invention is to provide a kind of constant-current control circuit, be intended to solve the problem of Control current accurately that is difficult to that power tube causes owing to various parameters are inconsistent in the prior art.
The present invention is achieved in that a kind of constant-current control circuit, is connected with load unit with external power source, and said constant-current control circuit comprises:
Power conversion unit, the input of the said external power source of input termination, the said load unit of output termination is used for converting said external power source to be applicable to said load unit work power supply;
The constant current control unit, the output of the said load unit of input termination, output head grounding is used for the electric current of the constant control flows of high accuracy through said load unit.
Said constant current control unit comprises operational amplifier, PMOS pipe, positive-negative-positive pliotron, current sense resistor, reference voltage source;
Wherein, The emitter of said positive-negative-positive pliotron Q is as the output of the said load unit of input termination of said constant current control unit, collector electrode meets said PMOS pipe M through said current sense resistor RSENS ground connection, base stage drain electrode; Collector electrode, the grid that the source electrode of said PMOS pipe M meets said NPN type pliotron Q connects the output of said operational amplifier OP; Collector electrode, the in-phase input end that the inverting input of said operational amplifier OP meets said positive-negative-positive pliotron Q connects the positive pole of said reference voltage source VREF, the minus earth of said reference voltage source VREF.
Said constant current control unit comprises many group constant current control branch roads, and said constant current control branch road comprises operational amplifier, PMOS pipe, positive-negative-positive pliotron, current sense resistor, reference voltage source;
Wherein, The emitter of said positive-negative-positive pliotron is as the output of the said load unit of input termination of said constant current control unit, collector electrode connects said PMOS pipe through said current sense resistor ground connection, base stage drain electrode; The source electrode of said PMOS pipe connects the collector electrode of said NPN type pliotron, the output that grid connects said operational amplifier; The inverting input of said operational amplifier connects the collector electrode of said positive-negative-positive pliotron, the positive pole that in-phase input end connects said reference voltage source, the minus earth of said reference voltage source.The in-phase input end of the operational amplifier of each the constant current control branch road in said many group constant current control branch roads all is connected with the positive pole of same reference voltage source, the common input that constitutes said constant current control unit of emitter of the positive-negative-positive pliotron of each the constant current control branch road in said many group constant current control branch roads.
Described this constant-current control circuit also comprises the PWM module; The output of said PWM module is connected with the control end of power conversion unit; Be used to adjust the size of the every road of said power conversion unit average output current, reach the purpose of said load unit being carried out the pulsewidth adjustment with the PWM pattern.
Another object of the present invention also is to provide a kind of electronic equipment that comprises said constant-current control circuit.
In the present invention; The said constant-current control circuit that comprises said power conversion unit and said constant current control unit through employing; Reach the purpose that said load unit is realized the high-accuracy and constant current control, thereby solved the problem of Control current accurately that is difficult to that the existing in prior technology power tube causes owing to various parameters are inconsistent.
Description of drawings
The schematic block circuit diagram of the constant-current control circuit that Fig. 1 provides for first embodiment of the invention;
The constant-current control circuit that Fig. 2 provides for second embodiment of the invention circuit theory diagrams;
The circuit theory diagrams of the constant-current control circuit that is used for the LED display backlight that Fig. 3 provides for third embodiment of the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer,, the present invention is done further detailed description below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only is used to explain the present invention, is not limited to the present invention.
In the present invention; The said constant-current control circuit that comprises said power conversion unit and said constant current control unit through employing; Reach the purpose that load unit is realized the high-accuracy and constant current control, thereby solved the problem of Control current accurately that is difficult to that the existing in prior technology power tube causes owing to various parameters are inconsistent.
With reference to Fig. 1, the schematic block circuit diagram of the constant-current control circuit that first embodiment of the invention provides, this constant-current control circuit comprises
power conversion unit100,
load unit200, constant
current control unit300.
Wherein, the input termination external power source of
power conversion unit100 is used for converting external power source to be applicable to
load unit200 work power supply; The output of the input termination
power conversion unit100 of
load unit200,
load unit200 carries out work through the power supply of
power conversion unit100 outputs; The output of the input
termination load unit200 of constant
current control unit300 is used for the electric current of constant control flows through
load unit200.
As one embodiment of the invention; This constant-current control circuit also comprises
PWM module400; The output of this
PWM module400 is connected with the control end of
power conversion unit100; Be used to adjust the size of
power conversion unit100 every road average output currents, reach the purpose of said load unit being carried out the pulsewidth adjustment with the PWM pattern.
With reference to Fig. 2; The circuit theory diagrams of the constant-current control circuit that second embodiment of the invention provides; This constant-current control circuit comprises
power conversion unit100,
load unit200, constant
current control unit300;
PWM module400, this constant
current control unit300 comprise operational amplifier OP, PMOS pipe M, positive-negative-positive pliotron Q, current sense resistor RSENS, reference voltage source VREF.
Wherein, The output of
PWM module400 is connected with the control end of
power conversion unit100; The input of the input termination external power source of
power conversion unit100, output
termination load unit200; The emitter of positive-negative-positive pliotron Q is as the output of the input
termination load unit200 of constant current control unit, collector electrode meets PMOS pipe M through current sense resistor RSENS ground connection, base stage drain electrode; Collector electrode, the grid that the source electrode of PMOS pipe M meets NPN type pliotron Q is connected in the output of operational amplifier OP; Collector electrode, the in-phase input end that the inverting input of operational amplifier OP is connected in positive-negative-positive pliotron Q is connected in the positive pole of reference voltage source VREF, the minus earth of reference voltage source VREF.
The circuit working principle of the embodiment of the invention is:
100 converts external power source into the power supply that is applicable to
load unit200 work; Size through PWM (Pulse Width Modulation)
module400 adjustment
power conversion units100 every road average output currents reaches the purpose of said load unit being carried out the pulsewidth adjustment with the PWM pattern.
Electric current I when the
load unit200 of flowing through EDuring increase, this moment, "+" terminal voltage V of current sense resistor RSENS raise, the voltage V of rising and reference voltage V REF relatively after, the voltage V that operational amplifier OP exports OUTReduce, according to formula (V GS=V OUT↓-V ↑) gate source voltage that can draw PMOS pipe M reduces, according to the pmos current formula
I DS ↑ = 1 2 C OX · μ n · W L · ( V GS ↓ - V Th ) 2 · ( 1 + λ · V DS ) ,So drain-source voltage V of PMOS pipe M DSIncrease, positive-negative-positive pliotron Q's penetrates base voltage V thus EBReduce.Because the emitter current of positive-negative-positive pliotron Q So through after the adjustment of constant-current control circuit, the electric current I of the
load unit200 of flowing through EReduce.
Otherwise, when the electric current I of
load unit200 EWhen reducing, this moment, "+" terminal voltage V of current sense resistor RSENS reduced, the voltage V of reduction and reference voltage V REF relatively after, the voltage V that operational amplifier OP exports OUTRaise, according to formula (V GS=V OUT↑-V ↓) can draw the gate source voltage increase that PMOS manages M, according to the pmos current formula
I DS ↓ = 1 2 C OX · μ n · W L · ( V GS ↑ - V Th ) 2 · ( 1 + λ · V DS ) ,So drain-source voltage V of PMOS pipe M DSReduce, positive-negative-positive pliotron Q's penetrates base voltage V thus EBIncrease.Because the emitter current of positive-negative-positive pliotron Q
So through after the adjustment of constant-current control circuit, the electric current I of the
load unit200 of flowing through EIncrease.
More than for the operation principle of constant-current control circuit of the present invention; The constant
current control unit300 of this constant-current control circuit comprises that operational amplifier OP, PMOS pipe M, positive-negative-positive power triode Q, current sense resistor RSENS, reference voltage source VREF constitute feedback loop, and it is stable to keep
load unit200 operating currents.
In the constant-current control circuit provided by the invention, the voltage V=(I of current sense resistor RSENS B+ β I B) RSENS=I ERSENS, I here EBe the electric current of the load unit of flowing through, the electric current of the load unit of therefore can flowing through is reflected on the current sense resistor RSENS fully, and promptly the voltage of current sense resistor RSENS is only relevant with the impedance of self with the electric current of the load unit of flowing through; And what reflect on the current sense resistor in the similar constant-current control circuit of prior art is the variation of positive-negative-positive power triode collector current, here the voltage V=I of current sense resistor RSENS CRSENS=β I BRSENS, promptly the β value of the voltage of current sense resistor RSENS and power tube self is relevant.Because the meeting of positive-negative-positive power tube β value is difference along with the difference of technology, temperature, applied environment, therefore can there be bigger error in similar constant-current control circuit.Therefore, a kind of constant-current control circuit provided by the invention has fundamentally solved in the constant-current control circuit owing to the isoparametric inconsistent Current Control error that causes of power tube β value, and control precision is higher.
Simultaneously; Owing to wherein flow through the current value of
unit200 for
so select the current sense resistor RSENS of different value; With obtaining the different current stabilization value of load unit of flowing through, therefore realize the adjustable of current stabilization value.
In addition, compare homogeneous circuit, make circuit structure simpler thereby saved such as some components and parts such as resistance.
In addition, this circuit is used for the constant-current control circuit of LED or other electronic equipments, the quiescent dissipation of every road series LED or the power consumption of other electronic equipments are reduced more than the 100 μ W, therefore more energy-conservation.
With reference to Fig. 3, the circuit theory diagrams of the constant-current control circuit that is used for the LED display backlight that third embodiment of the invention provides, this constant-current control circuit comprise
power conversion unit100,
load unit200, constant
current control unit300,
PWM module400.
The output of
PWM module400 is connected with the control end of
power conversion unit100, is used to adjust the size of
power conversion unit100 every road average output currents, reaches the purpose of said load unit being carried out the pulsewidth adjustment with the PWM pattern.
The input of the input termination external power source of
power conversion unit100, output
termination load unit200.
Wherein, constant
current control unit300 comprises many group constant current control branch roads, and each the constant current control branch road in said many group constant current control branch roads comprises operational amplifier, PMOS pipe, positive-negative-positive pliotron, current sense resistor, reference voltage source; Wherein first group of constant current control branch road comprises operational amplifier OP1, PMOS pipe M1, positive-negative-positive pliotron Q1, current sense resistor RSENS1, reference voltage source VREF; Second group of constant current control branch road comprises operational amplifier OP2, PMOS pipe M2, positive-negative-positive pliotron Q2, current sense resistor RSENS 2, reference voltage source VREF; And the like, N group constant current control branch road comprises operational amplifier OPN, PMOS pipe MN, positive-negative-positive pliotron QN, current sense resistor RSENSN, reference voltage source VREF.The in-phase input end that should organize the operational amplifier OP of each constant current control branch road in the constant current control branch roads all is connected with the positive pole of same reference voltage source VREF more.
This
load unit200 comprises the multiple series series LED that is in parallel.
The input termination external power source of
power conversion unit100, the input of the multiple series series LED200 that the output termination is in parallel, the input of each
road series LED200 of the multiple
series series LED200 that is in parallel joins.
The emitter of the positive-negative-positive pliotron Q of each group constant current control branch road connects the output of one road series LED, collector electrode connects the PMOS pipe through current sense resistor ground connection, base stage drain electrode separately as the input of constant current control unit; The source electrode of PMOS pipe connects the collector electrode of NPN type pliotron, the output that grid connects operational amplifier; The inverting input of operational amplifier connects the collector electrode of positive-negative-positive pliotron, the positive pole that in-phase input end connects reference voltage source, the minus earth of a reference source.
Wherein, the emitter of the positive-negative-positive pliotron Q of each the constant current control branch road in these many group constant current control branch roads connects road series LED in the
load unit200 separately as the input of each road constant current control branch road.
In the present embodiment; Because the circuit structure in the constant
current control unit300 in each group constant current control branch road is identical with second embodiment of the invention; The operation principle of the constant-current control circuit that then present embodiment provided also with second embodiment of the invention in consistent, therefore repeat no more.
Because being connected each road constant current control branch road separately with one road series LED, each road constant current control branch road all is connected in same reference voltage source VREF; Therefore the electric current of each road series LED of being in parallel of can guaranteeing to flow through equates, thereby has guaranteed that LED display reaches desirable display effect.
The embodiment of the invention also provides a kind of electronic equipment that comprises above-mentioned constant-current control circuit.
In embodiments of the present invention; The constant-current control circuit that comprises power conversion unit and constant current control unit through employing; This constant current control unit comprises that operational amplifier, PMOS pipe, positive-negative-positive pliotron, current sense resistor, reference voltage source constitute negative-feedback circuit; Reach the purpose that load unit is realized the high-accuracy and constant current control, thereby solved the problem of Control current accurately that is difficult to that the existing in prior technology power tube causes owing to various parameters are inconsistent.
In embodiments of the present invention, constant-current control circuit also has following beneficial effect:
1. control precision is high, has solved the problem of Control current accurately that is difficult to that power tube causes owing to various parameters such as β value are inconsistent completely; Control precision to electric current depends primarily on external current detecting unit simultaneously, and as adopting resistance as current detecting unit, and the precision of this resistance is ± 1% o'clock, and then the error of Current Control is ± 1% basically;
2. more energy-conservation, as this circuit being used for the LED constant-current control circuit, the quiescent dissipation of every road series LED is reduced more than the 100 μ W;
3. simple in structure, compare homogeneous circuit, make circuit simpler thereby saved such as some components and parts such as resistance.
Constant-current control circuit needing to be used for the electronic equipment of constant current control, can to make electronic device works more stable, prolong the life-span of electronic device works, more energy-conservation.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, having done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (5)
1. a constant-current control circuit is connected with load unit with external power source, it is characterized in that said constant-current control circuit comprises:
Power conversion unit, the input of the said external power source of input termination, the said load unit of output termination is used for converting said external power source to be applicable to said load unit work power supply;
The constant current control unit, the output of the said load unit of input termination, output head grounding is used for the electric current of the constant control flows of high accuracy through said load unit.
2. constant-current control circuit as claimed in claim 1 is characterized in that, said constant current control unit comprises operational amplifier OP, PMOS pipe M, positive-negative-positive pliotron Q, current sense resistor RSENS, reference voltage source VREF;
Wherein, The emitter of said positive-negative-positive pliotron Q is as the output of the said load unit of input termination of said constant current control unit, collector electrode meets said PMOS pipe M through said current sense resistor RSENS ground connection, base stage drain electrode; Collector electrode, the grid that the source electrode of said PMOS pipe M meets said NPN type pliotron Q connects the output of said operational amplifier OP; Collector electrode, the in-phase input end that the inverting input of said operational amplifier OP meets said positive-negative-positive pliotron Q connects the positive pole of said reference voltage source VREF, the minus earth of said reference voltage source VREF.
3. constant-current control circuit as claimed in claim 1; It is characterized in that; Said constant current control unit comprises many group constant current control branch roads, and each the constant current control branch road in said many group constant current control branch roads comprises operational amplifier, PMOS pipe, positive-negative-positive pliotron, current sense resistor, reference voltage source;
Wherein, The emitter of said positive-negative-positive pliotron is as the output of the said load unit of input termination of said constant current control unit, collector electrode connects said PMOS pipe through said current sense resistor ground connection, base stage drain electrode; The source electrode of said PMOS pipe connects the collector electrode of said NPN type pliotron, the output that grid connects said operational amplifier; The inverting input of said operational amplifier connects the collector electrode of said positive-negative-positive pliotron, the positive pole that in-phase input end connects said reference voltage source, the minus earth of said reference voltage source.
The in-phase input end of the operational amplifier of each the constant current control branch road in said many group constant current control branch roads all is connected with the positive pole of same reference voltage source, the common input that constitutes said constant current control unit of emitter of the positive-negative-positive pliotron of each the constant current control branch road in said many group constant current control branch roads.
4. constant-current control circuit as claimed in claim 1; It is characterized in that; Described this constant-current control circuit also comprises the PWM module, and the output of said PWM module is connected with the control end of power conversion unit, is used to adjust the size of the every road of said power conversion unit average output current.
5. an electronic equipment is characterized in that, comprises each described constant-current control circuit like claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2012100651802A CN102625528A (en) | 2012-03-13 | 2012-03-13 | Constant-current control circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100651802A CN102625528A (en) | 2012-03-13 | 2012-03-13 | Constant-current control circuit and electronic equipment |
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| CN102625528A true CN102625528A (en) | 2012-08-01 |
Family
ID=46565146
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| CN2012100651802A Pending CN102625528A (en) | 2012-03-13 | 2012-03-13 | Constant-current control circuit and electronic equipment |
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Cited By (4)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103957632A (en) * | 2014-04-25 | 2014-07-30 | 桂林市啄木鸟医疗器械有限公司 | Constant-current control circuit of light curing machine LED lamp |
| CN109061272A (en) * | 2018-08-30 | 2018-12-21 | 广州金升阳科技有限公司 | A kind of current detection circuit |
| CN109960303A (en) * | 2019-04-30 | 2019-07-02 | 深圳市明微电子股份有限公司 | A kind of self-adaption constant flow control device |
| CN117555383A (en) * | 2024-01-09 | 2024-02-13 | 成都市易冲半导体有限公司 | Constant voltage and constant current controller and power converter |
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| CN101146387A (en) * | 2007-10-10 | 2008-03-19 | 昝昕武 | A car background optical constant current control drive system and drive control method |
| CN202143265U (en) * | 2011-07-12 | 2012-02-08 | 科博达技术有限公司 | LED lamp controller based on digit PWM control technique |
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- 2012-03-13 CN CN2012100651802A patent/CN102625528A/en active Pending
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* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101146387A (en) * | 2007-10-10 | 2008-03-19 | 昝昕武 | A car background optical constant current control drive system and drive control method |
| CN202143265U (en) * | 2011-07-12 | 2012-02-08 | 科博达技术有限公司 | LED lamp controller based on digit PWM control technique |
Cited By (6)
* Cited by examiner, † Cited by third party| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103957632A (en) * | 2014-04-25 | 2014-07-30 | 桂林市啄木鸟医疗器械有限公司 | Constant-current control circuit of light curing machine LED lamp |
| CN109061272A (en) * | 2018-08-30 | 2018-12-21 | 广州金升阳科技有限公司 | A kind of current detection circuit |
| CN109061272B (en) * | 2018-08-30 | 2020-08-18 | 广州金升阳科技有限公司 | Current detection circuit |
| CN109960303A (en) * | 2019-04-30 | 2019-07-02 | 深圳市明微电子股份有限公司 | A kind of self-adaption constant flow control device |
| CN117555383A (en) * | 2024-01-09 | 2024-02-13 | 成都市易冲半导体有限公司 | Constant voltage and constant current controller and power converter |
| CN117555383B (en) * | 2024-01-09 | 2024-03-19 | 成都市易冲半导体有限公司 | Constant voltage and constant current controller and power converter |
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Application publication date: 20120801 |