CN101630170A - Adaptive control device internally and externally set with constant current and method thereof - Google Patents
Adaptive control device internally and externally set with constant current and method thereof Download PDFInfo
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Abstract
The invention discloses an adaptive control device internally and externally set with constant current which is encapsulated inside a chip, comprising a reference voltage generation unit, an arithmetic amplifier, a constant current generation unit, a selection unit, an internal resistance and an external resistance connecting end; according to voltage of the external resistance connecting end, whether constant current is generated according to the internal resistance or the external resistance. In addition, the invention provides an adaptive control method applying the device to internally and externally set constant current. The invention combines the two constant current generation manners in the prior art, generates a technical scheme which not only can solve the problem of coexistence of the two manners, but also can exert respective advantages of the two manners.
Description
Technical field
The present invention relates to set a kind of device and method of set with constant current, relate in particular to a kind of adaptive controller and method of internally and externally set with constant current.
Background technology
In integrated circuit, often need to export constant electric current and give corresponding device, this constant current requirements changes insensitive to condition of work and external condition.For example, the supply voltage of variation, temperature, technology cause the variation that output current produces, and almost can ignore.
Constant electric current can produce with constant voltage and constant resistance.Because the restriction of early stage ic manufacturing process level though can obtain one with the almost negligible constant voltage of supply voltage, temperature variation, is difficult in the resistance that chip internal directly obtains a constant resistance.And the resistance of discrete resistors is generally all more accurate, and very little with the variation of condition of work.So in the Chip Packaging process, encapsulate a pin separately and come out, the constant voltage that connects a discrete resistors and chip internal between this pin and ground realizes the output of steady current.
As shown in Figure 1, a kind of employing in the system that discrete resistors realizes steady current, steady current generation device 1 comprises: reference voltage generation unit 11, operational amplifier 12, NMOS pipe M10, proportional current mirror (Current Mirror) 13, external resistance link 14 and current output terminal 16.Steady current generation device 1 is encapsulated in chip internal, link to each other with external discrete resistors R14 by independent external resistance link 14, the steady current Iref that produces amplifies through proportional current mirror 13, and the amplification steady current Iout that obtains offers external light-emitting D1 by current output terminal 16.
The reference voltage V 112 that reference voltage generation unit 11 produces is the negligible voltage signals of the variation with supply voltage, temperature, technology.Reference voltage V 112 is added in operational amplifier 12 positive input terminals, by the circuit adjustment, obtains one and the equal feedback voltage V 114 of reference voltage V 112 magnitudes of voltage at operational amplifier 12 negative feedback ends.When reference voltage V 112 equated with feedback voltage V 114, the electric current I ref that flows through NMOS pipe M10 just can be got by formula (1):
When reference voltage V 112 voltage constants, external discrete resistors R14 also is the resistance of a constant resistance, and the Iref of Chan Shenging also is a steady current so.Passing ratio current mirror 13 mirror images amplify, and just can obtain one and amplify constant output electric current I out.
Continuous progress along with integrated circuit technology, it is more accurate to make absolute resistance value ratio, resistance with different temperature coefficients, circuit designer has the resistance of negative temperature coefficient and the resistance with positive temperature coefficient (PTC) by adopting simultaneously, method by temperature compensation obtains the less relatively resistance of temperature coefficient, so just this resistance can be integrated in IC interior, it is simple that integrated circuit is used, and the cost of this scheme also decreases.
As shown in Figure 2, a kind of system that adopts built-in resistor to realize steady current.In steady current generation device 1 ' inside, the resistance R 151 of an integrated positive temperature coefficient (PTC) and the resistance R 152 of a negative temperature coefficient by the method for temperature compensation, have obtained the less relatively built-in resistor R15 of temperature coefficient.The principle of work of miscellaneous part is identical with the steady current generation device 1 of discrete resistors realization among Fig. 1.
But, adopt built-in resistor to realize the method for steady current, can only obtain the less relatively built-in resistor of temperature coefficient, the temperature coefficient of the interior resistance of steady current generation device distributes very discrete, and absolute resistance can not satisfy the demand of high precision output current.At this moment, need in circuit design, increase the resistor trimming circuit, with convenient when the circuit package Pretesting by repairing conditioning technology (trimming), built-in resistor is done fine setting satisfies the current precision requirement to guarantee its absolute resistance and temperature coefficient.Increased the complexity of circuit design and test so undoubtedly.And because the mode of the external relatively discrete resistors of temperature coefficient of the output circuit that the restriction of integrated circuit technology obtains is bigger.Simultaneously, because this resistance is built-in, the user can not adjust the size of output current easily according to the requirement of oneself.
Summary of the invention
The present invention will solve above-mentioned two kinds of existing problems of current settings method, brings into play advantage separately simultaneously, and a kind of adaptive controller and method of new internally and externally set with constant current is provided.
For addressing the above problem, the present invention proposes a kind of adaptive controller of internally and externally set with constant current, comprising: reference voltage generation unit, operational amplifier, steady current generation unit; Also comprise selected cell, built-in resistor, and the external resistance link that is used to connect external resistance; Described reference voltage generation unit provides first reference voltage to described operational amplifier positive input respectively, provides second reference voltage to described selected cell; Described operational amplifier negative feedback end is connected to selected cell, makes described first feedback voltage and described first reference voltage equate that output terminal is connected to described steady current generation unit; Described steady current generation unit output steady current, and the output branch pressure voltage is to described selected cell; Described selected cell also is connected to described built-in resistor, described external resistance link respectively; Wherein, described selected cell is exported first feedback voltage to described operational amplifier negative feedback end according to the state of described external resistance link.
Described adaptive controller also comprises the proportional current mirror, and described proportional current mirror receives the described steady current of described steady current generation unit output, the steady current that output is amplified.
The state of described external resistance link comprises: described external resistance link is unsettled, and the voltage of described external resistance link equates and be higher than described second reference voltage with described branch pressure voltage; Described external resistance link connects described external resistance, and the voltage of described external resistance link is according to described branch pressure voltage generation and be lower than described second reference voltage; Wherein, unsettled when described external resistance link, described first feedback voltage is the voltage according to the built-in resistor of described branch pressure voltage generation; When described external resistance link connects described external resistance, described first feedback voltage is the voltage of the external resistance link that produces according to described branch pressure voltage.
The described operational amplifier output first control voltage is to described steady current generation unit; When described first feedback voltage was lower than described first reference voltage, the described first control voltage increased; When described first feedback voltage equaled described first reference voltage, the described first control voltage was tending towards fixing; When described first feedback voltage was higher than described first reference voltage, the described first control voltage reduced.
Described selected cell comprises: voltage comparator, phase inverter, first transmission gate, second transmission gate, the 3rd transmission gate, first divider resistance, second divider resistance; Described voltage comparator positive input is connected to described reference voltage generation unit, be used to receive described second reference voltage, described voltage comparator negative feedback end connects described external resistance connection, described first transmission gate, first data terminal, described second divider resistance, second end, described voltage comparator output terminal is connected to described phase inverter input end, the described first transmission gate forward control end, the reverse control end of described second transmission gate, the reverse control end of described the 3rd transmission gate; Described inverter output is connected to the reverse control end of described first transmission gate, the described second transmission gate forward control end, described the 3rd transmission gate forward control end; Described first transmission gate, second data terminal is connected to described operational amplifier negative feedback end, described the 3rd transmission gate second data terminal; Described second transmission gate, first data terminal is connected to described second divider resistance, first end, described steady current generation unit, and described second transmission gate, second data terminal is connected to described first divider resistance, first end; Described the 3rd transmission gate first data terminal is connected to described first divider resistance, second end, described built-in resistor.
Described voltage comparator receives described second reference voltage signal and described comparative voltage, produces described second control signal; Described second control signal of the anti-phase processing of described phase inverter is exported anti-phase second control signal.
Described second reference voltage signal is higher than described comparative voltage, and then described second control signal is a high level, and described anti-phase second control signal is a low level, the described first transmission gate conducting, and described second transmission gate and described the 3rd transmission gate end; Described second reference voltage signal is lower than described comparative voltage, and then described second control signal is a low level, and described anti-phase second control signal is a high level, described second transmission gate and described the 3rd transmission gate conducting, and described first transmission gate ends.
The present invention also proposes a kind of self-adaptation control method that said apparatus carries out internally and externally set with constant current of using, and comprising: described selected cell is exported first feedback voltage to described operational amplifier according to the state of external resistance link; Described operational amplifier is according to first reference voltage and described first feedback voltage, and the output first control voltage is to described steady current generation unit, and the described first control voltage of foundation, and first feedback voltage and first reference voltage are followed; Described steady current generation unit is exported corresponding branch pressure voltage to described selected cell according to the described first control voltage; When first feedback voltage equated with first reference voltage, the steady current generation unit produced steady current according to first feedback voltage.
The state that obtains described external resistance link comprises: when the voltage of described external resistance link is higher than described second reference voltage, described first feedback voltage is the voltage of the built-in resistor that produces of described branch pressure voltage; When the voltage of described external resistance link is lower than described second reference voltage, described first feedback voltage is the voltage of the external resistance link that produces of described branch pressure voltage.
The voltage of described foundation second reference voltage and external resistance link is exported first feedback voltage, comprising: receive the voltage of second reference voltage and external resistance link, produce second control signal; Anti-phase processing second control signal is exported anti-phase second control signal; According to second control signal and anti-phase second control signal, export first feedback voltage.
Compared with prior art, the present invention has the following advantages: when the user pays close attention to cost and the method for inner setting electric current can satisfy requiring of its output current size and precision the time, can the pin of external discrete resistors is unsettled, and IC interior automatic setting electric current.As user when higher or internal current does not satisfy customer requirements to the accuracy requirement of electric current, can adopt external discrete resistors to reach its purpose.The user can select the current settings mode according to the requirement of oneself like this, can save system cost, simplifies and uses, and also can overcome the not enough or size of current of current precision and not satisfy drawbacks such as customer requirements.
Description of drawings
Fig. 1 realizes the system schematic of steady current for prior art adopts discrete resistors;
Fig. 2 realizes the system schematic of steady current for prior art adopts built-in resistor;
Fig. 3 forms synoptic diagram for the adaptive control system of internally and externally set with constant current of the present invention;
Fig. 4 forms synoptic diagram for the adaptive control system of the internally and externally set with constant current of a specific embodiment of the present invention;
Fig. 5 is the process flow diagram of the self-adaptation control method of internally and externally set with constant current of the present invention;
Fig. 6 is the process flow diagram of the self-adaptation control method of the internally and externally set with constant current of a specific embodiment of the present invention.
Embodiment
The present invention combines two kinds of steady current producing methods of the prior art, produces a kind of problem that can either overcome the dual mode existence, can bring into play the technical scheme of advantage separately again.Embodiments of the present invention are described in detail below in conjunction with accompanying drawing.
As shown in Figure 3, be a kind of synoptic diagram of adaptive control system of steady current.This control system comprises: the adaptive controller 2 of internally and externally set with constant current, proportional current mirror 23, external light-emitting D1.The adaptive controller 2 of internally and externally set with constant current is encapsulated in chip internal, and output steady current Iref is to proportional current mirror 23 input ends, and the steady current Iout that 23 outputs of proportional current mirror are amplified is to external light-emitting D1.The present invention only offers light emitting diode with the steady current that amplifies and schematically illustrates, but is not limited thereto, and steady current also can offer any device that needs steady current.
The adaptive controller 2 of internally and externally set with constant current comprises: reference voltage generation unit 21, operational amplifier 22, steady current generation unit M20, selected cell 24, built-in resistor R26, and external resistance link 25.Built-in resistor R26 is made up of the resistance R 261 of positive temperature coefficient (PTC) and the resistance R 262 of negative temperature coefficient.Behind resistance R 262 tc compensations of the resistance R 261 of positive temperature coefficient (PTC) and negative temperature coefficient, built-in resistor R26 is exactly a resistance value and the irrelevant resistance of temperature coefficient.External resistance link 25 connects external resistance R 25.Reference voltage generation unit 21 provides first reference voltage V 212 to concatenation operation amplifier 22 positive inputs respectively, provides second reference voltage V 232 to selected cell 24.
When first feedback voltage V 214 was lower than first reference voltage V 212, the first control voltage V216 increased; When first feedback voltage V 214 equaled first reference voltage V 212, the first control voltage V216 was tending towards fixing; When first feedback voltage V 214 was higher than first reference voltage V 212, the first control voltage V216 reduced.By the adjustment of operational amplifier 22, first feedback voltage V 214 and first reference voltage V 212 are equated.
Steady current generation unit M20 receives the first control voltage V216, output steady current Iref, and provide branch pressure voltage V218 to selected cell 24.The first control voltage V216 increases or when reducing, branch pressure voltage V218 also increases or reduces, and the voltage V244 of corresponding built-in resistor and the voltage V252 of external resistance link also increase or reduce.Thereby first feedback voltage V 214 is followed increase or is reduced, and equates until being adjusted to first reference voltage V 212, and this moment, branch pressure voltage V218 fixed, and steady current generation unit M20 produces steady current Iref.
Selected cell 24 also connects built-in resistor R26 and external resistance link 25 respectively.Determine the state of external resistance link according to the voltage V252 of second reference voltage V 232 and external resistance link.Selected cell 24 is exported first feedback voltage V 214 to operational amplifier 22 negative feedback ends according to the state of external resistance link.
Unsettled when external resistance link 25, the voltage V252 of external resistance link equates with branch pressure voltage V218, is higher than second reference voltage V 232.First feedback voltage V 214 is the voltage V244 of built-in resistor, and the voltage V244 of this built-in resistor produces according to branch pressure voltage V218.Steady current Iref is the voltage V244 of built-in resistor and the ratio of built-in resistor R26.
When external resistance link connects 25 external resistance R 25, produce the voltage V252 of external resistance link according to branch pressure voltage V218, the voltage V252 of external resistance link is lower than second reference voltage V 232.First feedback voltage V 214 is the voltage V252 of external resistance link.Steady current Iref is the voltage V252 of external resistance link and the ratio of external resistance R 25.
Proportional current mirror 23 input ends receive steady current Iref, at steady current Iout who amplifies in proportion of output terminal output, offer the external light-emitting D1 that needs steady current, make it shinny.
A kind of embodiment of adaptive controller of internally and externally set with constant current is provided as shown in Figure 4.Wherein, selected cell 24 comprises: voltage comparator 241, phase inverter 242, the first transmission gate T243, the second transmission gate T244, the 3rd transmission gate T245, the first divider resistance R200, the second divider resistance R220.The steady current generation unit is NMOS pipe M201.This place gives an actual example only to be used as and schematically illustrates, but is not limited thereto.
The first transmission gate T243, second data terminal is connected to operational amplifier 22 negative feedback ends, the 3rd transmission gate T245 second data terminal.
The second transmission gate T244, first data terminal is connected to the second divider resistance R220, first end, NMOS manages source electrode, and the second transmission gate T244, second data terminal is connected to the first divider resistance R200, first end.
The 3rd transmission gate T245 first data terminal is connected to the first divider resistance R200, second end, built-in resistor R26.
When external resistance link 25 had external resistance R 25 between ground, branch pressure voltage V218 obtained the voltage V252 of external resistance link after the second divider resistance R220 and external resistance R 25 dividing potential drops.The voltage V252 of external resistance link and comparative voltage V234 are same node voltage, when comparative voltage V234 is lower than second reference voltage V 232, and after voltage comparator 241 compares, the second control signal V236 of output high level.The phase inverter 242 anti-phase processing second control signal V236, the anti-phase second control signal V238 of output low level.The second control signal V236 is a high level, when the anti-phase second control signal V238 is low level, and the first transmission gate T243 conducting, the second transmission gate T244 and the 3rd transmission gate T245 end.Branch pressure voltage V218 is after the second divider resistance R220 and external resistance R 25 dividing potential drops, and the voltage V252 of the external resistance link that obtains passes to feedback voltage V 214 by the first transmission gate T243.
When feedback voltage V 214 is the voltage V252 of external resistance link,, first feedback voltage V, 214 final sums, first reference voltage V 212 is equated by the adjustment of operational amplifier 22.At this moment, produce constant steady current Iref in NMOS pipe M201 drain electrode, steady current Iref is the ratio of first feedback voltage V 214 and external resistance R 25.Just obtain the steady current Iout that amplifies after steady current Iref passing ratio current mirror 23 ratios are amplified, it is shinny to offer external light-emitting D1.Adjust the resistance of external resistance R 25, can obtain the steady current Iref of different numerical value.
On the contrary, when external resistance link 25 did not connect external resistance R 25 between ground, external resistance link 25 was unsettled, and the voltage V252 of external resistance link equals branch pressure voltage V218, does not have electric current to flow through the second divider resistance R220.The voltage V252 of external resistance link and comparative voltage V234 are same node voltage, second reference voltage V 232 that is input to voltage comparator 241 positive input terminals is lower than the comparative voltage V234 of negative feedback end, through the voltage comparator 242 second control signal V236 of back output low level relatively, the low level second control signal V236 exports the anti-phase second control signal V238 of high level after phase inverter 242 is anti-phase.The second control signal V236 is a low level, when the anti-phase second control signal V238 is high level, and the second transmission gate T244 and the 3rd transmission gate T245 conducting, the first transmission gate T243 ends.Branch pressure voltage V218 through the first divider resistance R200 and built-in resistor R26 dividing potential drop after, the voltage V244 of the built-in resistor that obtains passes to feedback voltage V 214 by the 3rd transmission gate T245.
When feedback voltage V 214 is the voltage V244 of built-in resistor,, first feedback voltage V, 214 final sums, first reference voltage V 212 is equated by the adjustment of operational amplifier 22.At this moment, produce steady current Iref in NMOS pipe M201 drain electrode, steady current Iref is the ratio of first feedback voltage V 214 and built-in resistor R26.Just obtain the steady current Iout that amplifies after steady current Iref passing ratio current mirror 23 ratios are amplified, it is shinny to offer external light-emitting D1.
The present invention provides a kind of self-adaptation control method that said apparatus carries out internally and externally set with constant current of using in addition.As shown in Figure 5, a kind of self-adaptation control method of internally and externally set with constant current comprises:
Step S1, selected cell is exported first feedback voltage to operational amplifier according to the state of external resistance link.
Step S2, operational amplifier are according to first reference voltage and first feedback voltage, and the output first control voltage is to the steady current generation unit, and the foundation first control voltage, and first feedback voltage and first reference voltage are followed.
When first feedback voltage V 214 was lower than first reference voltage V 212, the first control voltage V216 increased; When first feedback voltage V 214 equaled first reference voltage V 212, the first control voltage V216 was tending towards fixing, and when first feedback voltage V 214 was higher than first reference voltage V 212, the first control voltage V216 reduced.
The first control voltage V216 increases or when reducing, branch pressure voltage V218 also increases or reduces, and the voltage V244 of corresponding built-in resistor also increases or reduces.Thereby first feedback voltage V 214 is followed increase or is reduced, and equates that until being adjusted to first reference voltage V 212 branch pressure voltage V218 fixes.
Step S3, the steady current generation unit is exported corresponding branch pressure voltage to selected cell according to the first control voltage.
Step S4, when first feedback voltage equated with first reference voltage, the steady current generation unit produced steady current according to first feedback voltage.
When first feedback voltage V 214 was adjusted to and equates with first reference voltage V 212, branch pressure voltage V218 fixed, and steady current generation unit M20 produces steady current Iref.
So, when the voltage V252 of external resistance link is higher than second reference voltage V 232, first feedback voltage V 214 is that steady current Iref is the voltage V244 of built-in resistor and the ratio of built-in resistor R26 according to the voltage V244 of the built-in resistor of branch pressure voltage V218 generation.
When the voltage V252 of external resistance link is lower than second reference voltage V 232, first feedback voltage V 214 is that steady current Iref is the voltage V252 of external resistance link and the ratio of external resistance R 25 according to the voltage V252 of the external resistance link of branch pressure voltage V218 generation.
As shown in Figure 6, as step S2, can may further comprise the steps:
Step S21 receives the voltage V252 of second reference voltage V 232 and external resistance link, produces the second control signal V236.
Step S22, the anti-phase processing second control signal V236 exports the anti-phase second control signal V238.
Step S23 according to the second control signal V236 and the anti-phase second control signal V238, exports first feedback voltage V 214.
When the second reference voltage signal V232 is higher than the voltage V252 of external resistance link, then the second control signal V236 is a high level, and the anti-phase second control signal V238 is a low level, and feedback voltage V 214 is the voltage V252 of external resistance link.
When the second reference voltage signal V23 is lower than the voltage V252 of external resistance link, then the second control signal V236 is a low level, and the anti-phase second control signal V238 is a high level, and feedback voltage V 214 is the voltage V244 of built-in resistor.
Though the present invention discloses as above with preferred embodiment, the present invention is defined in this.Any those skilled in the art without departing from the spirit and scope of the present invention, all can do various changes and modification, so protection scope of the present invention should be with claim institute restricted portion.
Claims (10)
1. the adaptive controller of an internally and externally set with constant current, comprise: reference voltage generation unit, operational amplifier, steady current generation unit, it is characterized in that, also comprise selected cell, built-in resistor, and the external resistance link that is used to connect external resistance;
Described reference voltage generation unit provides first reference voltage to described operational amplifier positive input respectively, provides second reference voltage to described selected cell;
Described operational amplifier negative feedback end is connected to selected cell, makes described first feedback voltage and described first reference voltage equate that output terminal is connected to described steady current generation unit;
Described steady current generation unit output steady current, and the output branch pressure voltage is to described selected cell;
Described selected cell also is connected to described built-in resistor, described external resistance link respectively;
Wherein, described selected cell is exported first feedback voltage to described operational amplifier negative feedback end according to the state of described external resistance link.
2. adaptive controller as claimed in claim 1 is characterized in that, also comprises the proportional current mirror, and described proportional current mirror receives the described steady current of described steady current generation unit output, the steady current that output is amplified.
3. adaptive controller as claimed in claim 1, it is characterized in that, the state of described external resistance link comprises: described external resistance link is unsettled, and the voltage of described external resistance link equates and be higher than described second reference voltage with described branch pressure voltage; Described external resistance link connects described external resistance, and the voltage of described external resistance link is according to described branch pressure voltage generation and be lower than described second reference voltage;
Wherein, unsettled when described external resistance link, described first feedback voltage is the voltage according to the built-in resistor of described branch pressure voltage generation; When described external resistance link connects described external resistance, described first feedback voltage is the voltage of the external resistance link that produces according to described branch pressure voltage.
4. adaptive controller as claimed in claim 1 is characterized in that, the described operational amplifier output first control voltage is to described steady current generation unit; When described first feedback voltage was lower than described first reference voltage, the described first control voltage increased; When described first feedback voltage equaled described first reference voltage, the described first control voltage was tending towards fixing; When described first feedback voltage was higher than described first reference voltage, the described first control voltage reduced.
5. adaptive controller as claimed in claim 1 is characterized in that, described selected cell comprises: voltage comparator, phase inverter, first transmission gate, second transmission gate, the 3rd transmission gate, first divider resistance, second divider resistance;
Described voltage comparator positive input is connected to described reference voltage generation unit, be used to receive described second reference voltage, described voltage comparator negative feedback end connects described external resistance connection, described first transmission gate, first data terminal, described second divider resistance, second end, described voltage comparator output terminal is connected to described phase inverter input end, the described first transmission gate forward control end, the reverse control end of described second transmission gate, the reverse control end of described the 3rd transmission gate;
Described inverter output is connected to the reverse control end of described first transmission gate, the described second transmission gate forward control end, described the 3rd transmission gate forward control end;
Described first transmission gate, second data terminal is connected to described operational amplifier negative feedback end, described the 3rd transmission gate second data terminal;
Described second transmission gate, first data terminal is connected to described second divider resistance, first end, described steady current generation unit, and described second transmission gate, second data terminal is connected to described first divider resistance, first end;
Described the 3rd transmission gate first data terminal is connected to described first divider resistance, second end, described built-in resistor.
6. adaptive controller as claimed in claim 5 is characterized in that, described voltage comparator receives described second reference voltage signal and described comparative voltage, produces described second control signal; Described second control signal of the anti-phase processing of described phase inverter is exported anti-phase second control signal.
7. adaptive controller as claimed in claim 6, it is characterized in that, described second reference voltage signal is higher than described comparative voltage, then described second control signal is a high level, described anti-phase second control signal is a low level, the described first transmission gate conducting, described second transmission gate and described the 3rd transmission gate end; Described second reference voltage signal is lower than described comparative voltage, and then described second control signal is a low level, and described anti-phase second control signal is a high level, described second transmission gate and described the 3rd transmission gate conducting, and described first transmission gate ends.
8. an application rights requires 1 described device to carry out the self-adaptation control method of internally and externally set with constant current, it is characterized in that, comprising:
Described selected cell is exported first feedback voltage to described operational amplifier according to the state of external resistance link;
Described operational amplifier is according to first reference voltage and described first feedback voltage, and the output first control voltage is to described steady current generation unit, and the described first control voltage of foundation, and first feedback voltage and first reference voltage are followed;
Described steady current generation unit is exported corresponding branch pressure voltage to described selected cell according to the described first control voltage;
When first feedback voltage equated with first reference voltage, the steady current generation unit produced steady current according to first feedback voltage.
9. self-adaptation control method as claimed in claim 8, it is characterized in that, the state that obtains described external resistance link comprises: when the voltage of described external resistance link is higher than described second reference voltage, described first feedback voltage is the voltage of the built-in resistor that produces of described branch pressure voltage; When the voltage of described external resistance link is lower than described second reference voltage, described first feedback voltage is the voltage of the external resistance link that produces of described branch pressure voltage.
10. self-adaptation control method as claimed in claim 8 is characterized in that, the voltage of described foundation second reference voltage and external resistance link is exported first feedback voltage, comprising:
Receive the voltage of second reference voltage and external resistance link, produce second control signal;
Anti-phase processing second control signal is exported anti-phase second control signal;
According to second control signal and anti-phase second control signal, export first feedback voltage.
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| CN102183989B (en) * | 2011-04-14 | 2013-03-27 | 上海艾为电子技术有限公司 | Self-adaptive current control device |
| CN103179715A (en) * | 2011-12-20 | 2013-06-26 | 常熟卓辉光电科技有限公司 | Constant current drive circuit of large-power light-emitting diode (LED) |
| CN103853226A (en) * | 2012-11-30 | 2014-06-11 | 瑞昱半导体股份有限公司 | Fixed current generating circuit and related fixed current generating method |
| CN103853226B (en) * | 2012-11-30 | 2016-06-01 | 瑞昱半导体股份有限公司 | Fixed current produces circuit and fixed current production method |
| CN103841728A (en) * | 2014-03-18 | 2014-06-04 | 杰华特微电子（杭州）有限公司 | Multichannel load balancing steady flow control circuit, corresponding circuit combination and control method |
| CN110419015A (en) * | 2016-12-26 | 2019-11-05 | 德州仪器公司 | Method and apparatus for using floating bandgap reference and temperature-compensating to carry out negative output voltage active-clamp |
| CN106708165A (en) * | 2017-03-15 | 2017-05-24 | 深圳慧能泰半导体科技有限公司 | Current source circuit, chip and electronic equipment |
| CN108646844A (en) * | 2018-05-31 | 2018-10-12 | 上海矽润科技有限公司 | A kind of temperature-compensation circuit, temperature-compensation method |
| CN112506262A (en) * | 2020-12-29 | 2021-03-16 | 上海华力微电子有限公司 | High-utilization-rate band-gap reference circuit |
| CN114326894A (en) * | 2021-12-11 | 2022-04-12 | 深圳市力生美半导体股份有限公司 | High-precision voltage comparator trimming circuit with hysteresis, method and chip |
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