CN103547009B - linear current regulator - Google Patents

linear current regulator Download PDF

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Publication number
CN103547009B
CN103547009B CN201210235062.1A CN201210235062A CN103547009B CN 103547009 B CN103547009 B CN 103547009B CN 201210235062 A CN201210235062 A CN 201210235062A CN 103547009 B CN103547009 B CN 103547009B
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current
amplifier
resistance
current source
voltage
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CN103547009A (en
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丁明强
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Dengfeng Microelectronics Co., Ltd.
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Green Solution Technology Co Ltd
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Abstract

The present invention provides a kind of linear current regulator, comprises one first amplifier, a current conversion unit, one first resistance, a reference current source, an adjustment unit and a reference voltage circuit;Above-mentioned first amplifier has reverse input end, non-inverting input and outfan;Current conversion unit, by the magnitude of voltage of the first amplifier non-inverting input, is converted into adjustment electric current output;First resistance couples this reverse input end and the outfan of the first amplifier;Reference current source couples reverse input end and first resistance of the first amplifier;Adjustment unit couples reference current source, and exports a current signal in order to adjust a reference current of reference current source;And reference voltage circuit, wherein an input couples a reference voltage, and its another input is coupled to the outfan of the first amplifier.

Description

Linear current regulator
Technical field
The present invention relates to a kind of current regulator, and particularly to a kind of linear current regulator.
Background technology
Due to the demand of energy saving, LED is at present to be widely used in various field, all It is that electronic product, household appliances, automobile, traffic sign, billboard etc. need point source or face light The occasion in source, has become the application market of LED the most.No matter LED be via boosting, blood pressure lowering, Step-up/down or linear voltage regulator drive, and connect that each drive circuit is modal to be needed exactly Control the output brightness of light.At present, for the control method of LED luminance, predominantly numeral is adjusted Light and simulation light modulation two kinds.
Digital dimming i.e. allows driving electric current toggle from the zero between target current value, modal Method is to utilize pulse width modulation (PWM) to set to circulate and the working cycle, but often Can produce along with the problem of Electro Magnetic Compatibility with electromagnetic interference, the problem causing potential frequency.
In contrast, according to the relation that the output curent change of LED driver is proportional to brightness, With the simulation dimming mode of linear regulation LED, it is easier to carry out.Therefore, searching one is high The current regulator of the linearity is with the brightness of stability contorting LED, it has also become the art one Important problem.
Summary of the invention
In view of this, the present invention provides a kind of linear current regulator, by adjusting reference current The reference current in source, to set the magnitude of voltage of a wherein input of the first amplifier, and by means of Current conversion unit, changes into adjustment electric current output by this magnitude of voltage, to realize the function that electric current adjusts, And apply function that this electric current adjusts in the control of LED luminance.
Additionally, the present invention can go to adjust reference current source by having variable-resistance adjustment unit Current value, and when the parameter of current regulator is setting value, variable-resistance resistance value is with upper State magnitude of voltage the most linear, and can directly adjust its resistance value and linearly set adjustment electric current, This adjust electric current in addition to can be applicable to LED luminance, the charged electrical being equally applicable in charger Stream, finely tunes charging current by adjusting variable-resistance resistance value, and saves replacing charger The inconvenience of hardware is with time-consuming.
According to the linear current regulator of one embodiment of the invention, comprise:
One first amplifier, a current conversion unit, one first resistance, a reference current source, One adjustment unit and a reference voltage circuit;Above-mentioned first amplifier has reverse input end, non- Reverse input end and outfan.Current conversion unit, by the non-inverting input of the first amplifier Magnitude of voltage, be converted into adjustment electric current output;First resistance, this coupling the first amplifier is reverse Input and outfan;Reference current source, couples reverse input end and a resistance of the first amplifier; Adjustment unit, couples reference current source, and exports a current signal in order to adjust reference current source One reference current;And a reference voltage circuit, there are two inputs, wherein this input is defeated Enter a reference voltage, another this input, it is coupled to the outfan of the first amplifier.
Above-mentioned reference voltage circuit is an error amplifier or a comparator, and this reference voltage Circuit also includes an outfan, and this outfan exports a voltage signal to a power stage circuit.
According to another embodiment of the present invention, above-mentioned reference current source produces ginseng according to reference voltage Examine electric current.
According to another embodiment of the present invention, above-mentioned adjustment unit has a variable resistance, in order to Adjust reference current.
According to another embodiment of the present invention, above-mentioned adjustment unit also comprise one second amplifier, One fixed current source, one first switch element and one first mirror current source.And second amplifier, There is reverse input end, non-inverting input and outfan;Fixed current source, couples variable resistance With this non-inverting input of the second amplifier, and export a fixed current;First switch element, Having the first end, the second end and the 3rd end, the second end of the first switch element couples the second amplifier Outfan, the 3rd end couples reverse input end and one second resistance of the second amplifier;And the One mirror current source, couples the first end of the first switch element, and exports this current signal, wherein, This current signal is directly proportional to this fixed current.
Foundation another embodiment of the present invention, above-mentioned current regulator, wherein, fixed current source It is positioned at the inside of integrated circuit (IC), and this variable resistance is positioned at the outside of integrated circuit.
According to another embodiment of the present invention, above-mentioned reference current source comprise one the 3rd amplifier, One second switch element and one second mirror current source.3rd amplifier, have reverse input end, Non-inverting input and outfan, wherein the reverse input end input reference voltage of the 3rd amplifier; Second switch element, has the first end, the second end and the 3rd end, the second end of second switch element Coupling the outfan of the 3rd amplifier, the first end couples the non-inverting input and of the 3rd amplifier 3rd resistance;And second mirror current source, couple the 3rd end of second switch element, and export Reference current, wherein, reference current is directly proportional to reference voltage.
According to another embodiment of the present invention, above-mentioned current regulator, the second resistance therein etc. In the 3rd resistance.
According to another embodiment of the present invention, the electricity of the non-inverting input of the first above-mentioned amplifier Pressure value is directly proportional to variable-resistance resistance value.
According to another embodiment of the present invention, the non-inverting input of this above-mentioned the first amplifier Magnitude of voltage is equal to the product of variable-resistance resistance value with the current value of fixed current.
In sum, the having the advantage that of the present invention
1, the linear current regulator of the present invention, is applicable to the electricity needing electric current to adjust application On sub-commodity, such as: LED and charger;
2, by means of adjusting reference current source, to realize the function that electric current adjusts;And
3, by means of adjusting variable resistance, with direct Serial regulation electric current, and replacing can be saved The inconvenience of charger hardware is with time-consuming.
With embodiment, above-mentioned explanation will be explained in detail below, and the skill to the present invention Art scheme provides and further explains.
Accompanying drawing explanation
For the above and other purpose of the present invention, feature, advantage and embodiment can be become apparent from easily Understanding, appended accompanying drawing is described as follows:
Fig. 1 is the circuit diagram of an embodiment of the linear current regulator of the present invention;
Fig. 2 is that the circuit of an embodiment of the adjustment unit of the linear current regulator of the present invention shows It is intended to;
Fig. 3 is the circuit of an embodiment of the reference current source of the linear current regulator of the present invention Schematic diagram;
Fig. 4 is the high linearity Voltage Cortrol of an embodiment of the linear current regulator of the present invention Schematic diagram.
[main element description of reference numerals]
First amplifier 110
Current conversion unit 120
First resistance R1
Reference current source 130
Adjustment unit 140
Reference voltage circuit 150
Output electric current Io
The magnitude of voltage V1 of the non-inverting input of the first amplifier
Adjust electric current Ia
Current signal Im
Reference current Iref
Reference voltage Vref
Running voltage VDD
Fixed current Id
Second amplifier 141
Fixed current source 142
Variable resistance Rj
Second resistance R2
First switch element M1
First mirror current source 143
3rd amplifier 131
Second switch element M2
Second mirror current source 132
3rd mirror current source 133
Currentamplificationfactorβ
3rd resistance R3
Detailed description of the invention
In order to the narration making the present invention is more detailed with complete, can refer to appended accompanying drawing and following Described various embodiment, number identical in accompanying drawing represents same or analogous element.On the other hand, Well-known element and step are not described in embodiment, so that avoid causing the present invention need not The restriction wanted.
In " detailed description of the invention " with " claims ", unless literary composition has for article Being particularly limited to, otherwise " one " can refer to one or more with " being somebody's turn to do ".
Fig. 1 is the circuit diagram of an embodiment of the linear current regulator of the present invention.This line Property current regulator comprise one first amplifier 110, current conversion unit 120,1 first electricity Resistance R1, reference current source 130, adjustment unit 140 and a reference voltage circuit 150.
Above-mentioned first amplifier 110 has a reverse input end, a non-inverting input and an output End.Current conversion unit 120, by the magnitude of voltage of the non-inverting input of the first amplifier 110 V1, is converted into an adjustment electric current Ia output.First resistance R1 is coupled to the first amplifier 110 Reverse input end and outfan.Reference current source 130, is coupled to the anti-of the first amplifier 110 To input and the first resistance R1.Adjustment unit 140, is coupled to reference current source 130, and defeated Go out a current signal Im in order to adjust a reference current Iref of reference current source 130.
Reference voltage circuit 150 has two inputs, and wherein this input input one is with reference to electricity Pressure Vref, another input is coupled to the outfan of the first amplifier 110.In the present embodiment, ginseng Examine potential circuit 150 as a example by error amplifier, but the present invention is not limited, reference voltage electricity Road also can be selected for comparator or similar circuit.Reference circuit 150 is in order to (to be coupled to its one end This end of first amplifier 110) current potential, be equivalent to the current potential of the other end of reference circuit 150, The i.e. current potential of reference voltage Vref, and exported a voltage signal by the outfan of reference circuit 150 To a power stage circuit (not shown).
According to above-mentioned current regulator, the non-inverting input of the first amplifier 110 can be obtained Magnitude of voltage V1, equation below (1) calculates:
V1=(Im-Iref) × R1+Vref ... (1)
Wherein, V1 refers to the magnitude of voltage of the non-inverting input of the first amplifier 110, and Im refers to electric current Signal, Iref refers to the reference current of current source 130, and R1 refers to the first resistance, and Vref refers to reference to electricity Pressure.Can obtain via formula (1), magnitude of voltage V1 linearly changes along with current signal Im, electricity Stream signal Im is used for adjusting the reference current Iref of reference current source 130, via adjusting with reference to electricity Stream Iref, to set the magnitude of voltage V1 of the non-inverting input of the first amplifier 110, then by electricity Magnitude of voltage V1, via current conversion unit 120, is changed into adjustment electric current Ia output by pressure value V1, This adjusts electric current Ia and can be used to adjust the output electric current Io of electronic component, with LED with charger is Example, i.e. can be used to adjust the electric current flowing through LED, and then the brightness of control LED, also may utilize This adjusts electric current and is finely adjusted the electric current of charger, to control the charging interval of charger.Wherein, Above-mentioned current conversion unit 120 utilizes a resistance circuit to realize.
Fig. 2 is the electricity of an embodiment of the adjustment unit 140 of the linear current regulator of the present invention Road schematic diagram.Fix as in figure 2 it is shown, adjustment unit 140 comprises one second amplifier 141, Current source 142, one variable resistance Rj, one first switch element M1 and one first mirror current source 143。
Above-mentioned second amplifier 141, has a reverse input end, a non-inverting input and one defeated Go out end.Fixed current source 142, couples the non-inverting input of the second amplifier 141, and exports One fixed current Id.Variable resistance Rj couples this fixed current source 142.First switch element M1 Having one first end, one second end and one the 3rd end, second end of the first switch element M1 couples This outfan of second amplifier 141, the 3rd end couples the reverse input end of the second amplifier 141 With one second resistance R2.First mirror current source 143, has current amplification factor α and couples This first end of first switch element M1, and output current signal Im.
According to above-mentioned adjustment unit 140, can obtain current signal Im, equation below (2) is counted Calculate:
Im=α × Id × Rj/R2 ... (2)
Wherein, Im refers to the output current signal of the first mirror current source 143, and α refers to the first mirror image The current amplification factor of current source 143, Id refers to the output fixed current in fixed current source 142, Rj refers to that variable resistance, R2 refer to the second resistance.Can obtain via formula (2), current signal Im with The output fixed current Id in fixed current source 142 is directly proportional, and via changing variable resistance Rj's Resistance value, can change output current signal Im, and then adjust the reference of reference current source 130 Electric current Iref(refer to Fig. 1).
Above-mentioned fixed current source 142 can be the fixed current source that integrated circuit (IC) is internal, and Variable resistance Rj is positioned at integrated circuit external, adjusts the resistance value of variable resistance Rj by means of outside, The current value of IC interior can be controlled, so, the inconvenience changing hardware can be saved with time-consuming.
Fig. 3 is an embodiment of the reference current source 130 of the property degree current regulator of the present invention Circuit diagram.As it is shown on figure 3, reference current source comprises one the 3rd amplifier 131,1 second Switch element M2, one second mirror current source 132 and one the 3rd mirror current source 133.On State the 3rd amplifier 131 and there is a reverse input end, a non-inverting input and an outfan, its In the non-inverting input input reference voltage Vref of the 3rd amplifier 131.Second switch element M2 has one first end, one second end and one the 3rd end, second end of second switch element M2 Coupling the outfan of the 3rd amplifier 131, the first end couples one end of the 3rd mirror current source 133, 3rd end couples reverse input end and one the 3rd resistance R3 of the 3rd amplifier 131.Second mirror image Current source 132, has currentamplificationfactorβ and couples the other end of the 3rd mirror current source 133 3rd end of second switch element M2, and output reference current Iref.
According to above-mentioned reference current source 130, reference current Iref, equation below (3) can be obtained Calculate:
Iref=β × Vref/R3 ... (3)
Wherein, Iref refers to that reference current Iref, β that reference current source 130 exports refer to the second mirror image The currentamplificationfactorβ of current source 132, Vref refers to that reference voltage, R3 refer to the 3rd resistance.By Formula (3) can be learnt, reference current source 130 produces reference current Iref according to reference voltage Vref, When required reference current Iref is the biggest, the biggest optional reference voltage Vref, i.e. reference Electric current Iref and reference voltage Vref direct ratio.
According to formula (1)~formula (3), as R2=R3 and α=β, following equation can be obtained (4):
V1=(IdRj-Vref) R1 α/R2+Vref ... (4)
When R1 × α=R2 or R1=R2 and α=1, following equation (5) can be obtained:
V1=IdRj ... (5)
Wherein, V1 refers to the magnitude of voltage of the non-inverting input of the first amplifier 110, and Id refers to fix The output fixed current of current source 142, Rj refers to that variable resistance, Vref refer to that reference voltage, β refer to The current amplification factor of two mirror current sources 132, β, α refer to the electricity of the first mirror current source 143 Stream amplification coefficient, R1 refers to the first resistance, and R2 refers to the second resistance, and R3 refers to the 3rd resistance.
According to formula (5), the magnitude of voltage of the non-inverting input of the first amplifier 110 can be learnt V1 is directly proportional to variable resistance Rj, and as shown in Figure 4, Fig. 4 is that the linear current of the present invention adjusts The high linearity Voltage Cortrol schematic diagram of one embodiment of device.By means of adjusting variable resistance Rj's Resistance value, can obtain the magnitude of voltage V1 of the non-inverting input of high linearity, then by non-return defeated Enter end magnitude of voltage V1 via current conversion unit 120, change into adjustment electric current Ia output, Obtaining the adjustment electric current Ia with high linearity, this adjusts electric current Ia and can be used to control the bright of LED Spend or the electric current of charger is adjusted.
Although the disclosed mode performed as described above of the present invention, but the present invention of being not limited to, appoint What those of ordinary skill in the art, without departing from the spirit and scope of the present invention, it is possible to can make each Kind change and modification, therefore protection scope of the present invention with claim defined in the range of Accurate.

Claims (9)

1. a linear current regulator, it is characterised in that comprise:
One first amplifier, has a reverse input end, a non-inverting input and an outfan;
One current conversion unit, changes the magnitude of voltage of the non-inverting input of this first amplifier Become an adjustment electric current output;
One first resistance, couples this reverse input end and this outfan of this first amplifier;
One reference current source, couples this reverse input end and this first resistance of this first amplifier;
One adjustment unit, couples this reverse input end of this first amplifier, and exports an electric current Signal is in order to adjust a reference current of this reference current source, and wherein this adjustment unit includes one Variable resistance and one first mirror current source, this first mirror current source in order to output-controlled in this This current signal variable-resistance;And
One reference voltage circuit, has two inputs, and wherein this input input one is with reference to electricity Pressure, another this input is coupled to the outfan of this first amplifier.
2. linear current regulator as claimed in claim 1, it is characterised in that this reference Potential circuit is an error amplifier or a comparator, and this reference voltage circuit also includes that one is defeated Going out end, this outfan exports a voltage signal to a power stage circuit.
3. linear current regulator as claimed in claim 1, it is characterised in that this reference Current source produces this reference current according to this reference voltage.
4. linear current regulator as claimed in claim 1, it is characterised in that this adjustment Unit also comprises:
One second amplifier, has a reverse input end, a non-inverting input and an outfan;
One fixed current source, couples this non-return input of this variable resistance and this second amplifier End, and export a fixed current, the described variable resistance other end is connected with ground wire;
One first switch element, has one first end, one second end and one the 3rd end, and this is first years old Second end of switch element couples this outfan of this second amplifier, the 3rd end couple this second This reverse input end of amplifier and one second resistance, the described second resistance other end is with ground wire even Connect;
Wherein, this first mirror current source couples this first end of this first switch element, and defeated Going out this current signal, this current signal is directly proportional to this fixed current.
5. linear current regulator as claimed in claim 4, it is characterised in that this is fixed Current source is positioned at the inside of an integrated circuit, and this variable resistance is positioned at the outside of this integrated circuit.
6. linear current regulator as claimed in claim 4, it is characterised in that this reference Current source comprises:
One the 3rd amplifier, has a reverse input end, a non-inverting input and an outfan, Wherein the non-inverting input of the 3rd amplifier inputs this reference voltage;
One second switch element, has one first end, one second end and one the 3rd end, and this is second years old Second end of switch element couples this outfan of the 3rd amplifier, and the first end couples one the 3rd One end of mirror current source, the 3rd end couples this reverse input end and one of the 3rd amplifier Three resistance, the described 3rd resistance other end is connected with ground wire;And
One second mirror current source, couples the other end of the 3rd mirror current source, and output should Reference current, wherein, this reference current is directly proportional to this reference voltage.
7. linear current regulator as claimed in claim 6, it is characterised in that this is second years old Resistance is equal to the 3rd resistance.
8. linear current regulator as claimed in claim 7, it is characterised in that this is first years old The magnitude of voltage of the non-inverting input of amplifier is directly proportional to this variable-resistance resistance value.
9. linear current regulator as claimed in claim 7, it is characterised in that the first mirror The current amplification factor in image current source is equal to the current amplification factor of the second mirror current source, and This first resistance is multiplied by the current amplification factor of the first mirror current source and is equal to this second resistance, makes Obtain this first amplifier non-inverting input magnitude of voltage equal to this variable-resistance resistance value with The product of the current value of this fixed current.
CN201210235062.1A 2012-07-09 2012-07-09 linear current regulator Active CN103547009B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109256939B (en) * 2017-07-12 2020-09-01 赤多尼科两合股份有限公司 Current selection circuit and drive circuit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697871A (en) * 1970-03-19 1972-10-10 Leeds & Northrup Co Single element adjustment for span and gain
US4399399A (en) * 1981-12-21 1983-08-16 Motorola, Inc. Precision current source
US5570060A (en) * 1995-03-28 1996-10-29 Sgs-Thomson Microelectronics, Inc. Circuit for limiting the current in a power transistor
CN101025637A (en) * 2006-02-20 2007-08-29 智原科技股份有限公司 Current mode trimming device
CN101089770A (en) * 2006-06-15 2007-12-19 美国芯源系统股份有限公司 Low dropout linear regulator having high power supply rejection and low quiescent current

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3697871A (en) * 1970-03-19 1972-10-10 Leeds & Northrup Co Single element adjustment for span and gain
US4399399A (en) * 1981-12-21 1983-08-16 Motorola, Inc. Precision current source
US5570060A (en) * 1995-03-28 1996-10-29 Sgs-Thomson Microelectronics, Inc. Circuit for limiting the current in a power transistor
CN101025637A (en) * 2006-02-20 2007-08-29 智原科技股份有限公司 Current mode trimming device
CN101089770A (en) * 2006-06-15 2007-12-19 美国芯源系统股份有限公司 Low dropout linear regulator having high power supply rejection and low quiescent current

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