CN103257662B - Linear constant-current modulation circuit - Google Patents
Linear constant-current modulation circuit Download PDFInfo
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- CN103257662B CN103257662B CN201210066941.6A CN201210066941A CN103257662B CN 103257662 B CN103257662 B CN 103257662B CN 201210066941 A CN201210066941 A CN 201210066941A CN 103257662 B CN103257662 B CN 103257662B
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Abstract
The invention relates to a linear constant-current modulation circuit which comprises a voltage detection circuit, a power tube (M1), a switch tube (M2) and a plurality of resistors (Rext). The power tube (M1) is serially connected with the switch tube (M2), the switch tube (M2) is connected with the resistors (Rext) in parallel, the voltage detection circuit detects voltage difference (VM1) of two ends of the power tube (M1), and the switch tube (M2) is in a cut-off state under the control of the voltage detection circuit when the voltage difference (VM1) exceeds a preset threshold voltage (VMT). The linear constant-current modulation circuit has the advantages that adverse effect on a constant-current circuit when working power of an existing power tube is excessively high is eliminated, and the operational stability and the operational reliability of the linear constant-current modulation circuit are improved.
Description
Technical field
The present invention relates to integrated circuit fields, particularly relate to a kind of linear constant-current modulation circuit.
Background technology
At present, linear constant-current modulation circuit is widely used a kind of element circuit in Analogous Integrated Electronic Circuits, has a wide range of applications in practice.In linear constant-current modulation circuit, see Fig. 1, error amplifier (EA) is by amplifying with comparing of internal reference level (Vref) feedback voltage (Vcs), power tube (M1) is modulated, thus accurately controls steady current (Io).Computing formula is:
Io＝Vref/Rcs (1)
VL＝Io*RL (2)
VM＝Vin-VL (3)
PM1＝VM*Io＝(Vin-VL)*Io (4)
When the impedance RL of load changes little, the pressure drop VL on it is when flowing through steady current Io, also substantially constant, and so when input voltage vin changes, the pressure drop VM fallen on power tube M1 will change thereupon.That is to say that the basic functional principle of Heising modulation circuit is exactly the resistance by modulation power pipe, reach the object making output constant current.When input voltage vin becomes large, modulated by loop, make the conducting resistance of power tube also become large, thus the voltage drop at power tube two ends is increased thereupon, make output current Io can keep constant.But consequence is exactly, when input voltage becomes large, the power that power tube is born also linearly increases thereupon, see Fig. 2.Especially, when input voltage vin is far longer than loaded pressure drop VL, the power that power tube is born is very large, and heat condition will be more serious.
Summary of the invention
For the linear constant-current modulation circuit of prior art, the power ratio that power tube is born is comparatively large, and more serious problem of generating heat, the present invention proposes a kind of linear constant-current modulation circuit.
In first aspect, the invention provides a kind of linear constant-current modulation circuit.This circuit comprises voltage detecting circuit, power tube (M1), switching tube (M2) and some resistance (Rext); Described power tube (M1) and described switching tube (M2) are connected in series; Described switching tube (M2) and described some resistance (Rext) are connected in parallel; Described voltage detecting circuit detects the voltage difference (VM1) at described power tube (M1) two ends, when described voltage difference (VM1) exceedes default threshold voltage (VMT), it is cut-off state that described voltage detecting circuit controls described switching tube (M2).
Linear constant-current modulation circuit provided by the invention solves in existing linear constant-current modulation circuit due to the excessive heat dissipation problem caused of power when power tube works, achieve in the linear constant-current modulation circuit power consumption object by internal power pipe and non-essential resistance shared, eliminate power tube operating power excessive time adverse effect that constant-current circuit is brought, improve the Stability and dependability of linear constant-current modulation circuit work.
Accompanying drawing explanation
Fig. 1 is prior art neutral line Heising modulation circuit diagram;
Fig. 2 is the voltage oscillogram in prior art linear constant-current modulation circuit;
Fig. 3 is a linear constant-current modulation circuit provided by the invention;
Fig. 4 is the voltage oscillogram in linear constant-current modulation circuit provided by the invention;
Fig. 5 is another linear constant-current modulation circuit provided by the invention.
Embodiment
Clearer for what make the technical scheme of the embodiment of the present invention and advantage express, below by drawings and Examples, technical scheme of the present invention is described in further detail.
The linear constant-current modulation circuit that Fig. 3 provides for the embodiment of the present invention; As shown in Figure 3, this constant-current control circuit comprises radiating circuit and existing constant-current control circuit; Wherein, this radiating circuit comprises: voltage detecting circuit, switching tube M2 and several non-essential resistances Rext; This existing constant-current control circuit comprises input voltage vin, load device, power tube M1, error amplifier EA, reference voltage Vref, feedback voltage V cs and resistance Rcs.
It should be noted that load device is in embodiments of the present invention the device such as resistance, LED, at this, is resistance for load device, is described the annexation of linear constant-current modulation circuit of the present invention, principle of work.
In the embodiment of the present invention, the grid of switching tube M2 is connected with voltage detecting circuit.By conducting or the cut-off state of voltage detecting circuit gauge tap pipe M2, the drain electrode of switching tube M2 is connected with the source electrode of power tube M1 in existing constant-current control circuit, and the source electrode of switching tube M2 is connected with resistance Rcs in existing constant-current control circuit; Voltage detecting circuit is connected with input voltage in existing constant-current control circuit, for detecting the change of input voltage, voltage detecting circuit is connected with the drain electrode of power tube M1 in existing constant-current control circuit, for detecting the change in voltage of input voltage after pull-up resistor RL, voltage detecting circuit is connected with the source electrode of power tube M1 in existing constant-current control circuit and the drain electrode of switching tube M2, for detecting the change in voltage of input voltage after pull-up resistor RL and power tube M1.
At drain electrode and the source electrode two ends non-essential resistance Rext in parallel of switching tube M2.Because switching tube M2 is in the low side of whole circuit, namely closely hold, top has power tube M1 to isolate, higher voltage need not be born as power tube M1, therefore, low-voltage device can be adopted to make switching tube M2, that is designed by the conducting resistance Rdson2 of switching tube M2 is less, the conducting resistance Rdson2 of switching tube M2 is far smaller than non-essential resistance Rext, the area spent or cost are less equally, because the conducting resistance Rdson2 of switching tube M2 is smaller, during conducting, the voltage drop that it is shared is also just smaller, therefore in follow-up derivation, this voltage drop can be ignored, moreover, due to when selecting resistance Rcs, that also the resistance of resistance Rcs is selected is less, during conducting, the voltage drop that it is shared is also just smaller, therefore in follow-up derivation, this voltage drop can be ignored.
Below in conjunction with Fig. 4, the course of work of the testing circuit of Fig. 3 is specifically described.Fig. 4 is the voltage oscillogram in linear constant-current modulation circuit provided by the invention.
The principle of embodiment of the present invention linear constant-current modulation circuit is, first according to the range set threshold voltage VMT of the input voltage of user, when input voltage vin is lower, the pressure drop VM1 at power tube M1 two ends is lower than the threshold voltage VMT set, switching tube M2 conducting, because the conducting resistance Rdson2 of switching tube M2 is smaller, be far smaller than the conducting resistance Rdson1 of power tube M1, the voltage then increased along with the time due to input voltage and the pressure drop VM produced, all drop on power tube M1, steady current Io from pull-up resistor RL through power tube M1, switching tube M2 and resistance Rcs flows to ground end, form path.When input voltage vin continues to increase, make the pressure drop VM1 at power tube M1 two ends reach threshold voltage VMT, switching tube M2 turns off by voltage detecting circuit, and make switching tube M2 be cut-off state, then steady current Io flows through from non-essential resistance Rext.
Therefore, when switching tube M2 ends, steady current Io flows through from non-essential resistance Rext, and non-essential resistance Rext bears the part pressure drop of VMT, and now, the pressure drop on power tube reduces according to the pressure drop born of non-essential resistance Rext of design, can be reduced to zero in theory.If input voltage vin continues to increase, by error amplifier EA, feedback voltage V cs was amplified with comparing of reference level Vref, the resistance of power tube M1 is modulated, make the resistance of power tube M1 start to increase, the voltage drop that it is born is corresponding increase also, bears unnecessary voltage drop.
When input voltage vin declines, and voltage detecting circuit detects that the pressure drop VM1 at power tube M1 two ends is lower than threshold voltage VMT, by switching tube M2 conducting, conducting resistance Rdson2 due to switching tube M2 is far smaller than non-essential resistance Rext, now electric current I o flows through from switching tube M2 again, therefore, the power problems of power tube in prior art neutral line Heising modulation circuit can be reduced by linear constant-current modulation circuit of the present invention, and then solve the problem of power tube heat radiation, make the temperature rise of each device in controllable scope, improve the Stability and dependability of system works.
For the principle of inventive Heising modulation circuit, be described below with reference to the principle of work of specific embodiment to circuit.
As shown in Figure 3 and Figure 4, in embodiments of the present invention, suppose that the scope of user's input voltage is between 50-150V, threshold voltage VMT is set as 50V, steady current Io is set as 100mA, the Standard resistance range of pull-up resistor RL is between 480 Ω-520 Ω, and non-essential resistance Rext determines according to formula below:
Rext＝VMT/Io (5)
Namely the resistance value of Rext is 500 Ω.
When input voltage is lower, if input voltage is at 70V, when pull-up resistor is 500 Ω, now steady current Io is after pull-up resistor RL, at the voltage of VM point for draw according to formula (3), VM=Vin-VL, namely now VM point voltage is 20V, therefore, after voltage detecting circuit detects the magnitude of voltage of VM point, by the resistance of error amplifier Modulating Power pipe M1, when making steady current Io flow through power tube M1, the voltage of 20V will be born, produce the power of 2W, the pressure drop VM1 at power tube M1 two ends is lower than the threshold voltage VMT set, voltage detecting circuit is by switching tube M2 conducting, because the conducting resistance Rdson2 of switching tube M2 is smaller, be far smaller than the conducting resistance Rdson1 of power tube M1, steady current Io from pull-up resistor RL through power tube M1, switching tube M2 and resistance Rcs flows to ground end, form path.
When input voltage vin continues to increase, as input voltage increases to 100V, when pull-up resistor is still 500 Ω, now steady current Io is after pull-up resistor RL, at the voltage of VM point for draw according to formula (3), VM point voltage is 50V, and the pressure drop on power tube VM1 is determined according to formula below:
VM1＝VM-VM2 (6)
Because the conducting resistance Rdson2 of switching tube M2 is smaller, be far smaller than the conducting resistance Rdson1 of power tube M1, the pressure drop on switching tube M2 is insignificant, and therefore, VM1=VM=50V, has reached the threshold value VMT of setting, 50V.
After voltage detecting circuit detects the magnitude of voltage of VM point, and the pressure drop VM1 at power tube M1 two ends reaches threshold voltage VMT, switching tube M2 turns off by voltage detecting circuit, make switching tube M2 be cut-off state, the resistance value due to non-essential resistance Rext is 500 Ω, and therefore non-essential resistance can the maximum voltage of dividing potential drop be 50V, after steady current Io flows through power tube M1, because switching tube M2 is cut-off state, steady current Io holds through non-essential resistance Rext and resistance Rcs with flowing to, and forms path.The pressure drop born according to the non-essential resistance Rext of design due to, the pressure drop on power tube M1 and reducing, can be reduced to zero in theory, as shown in Figure 4, when switching tube M2 turns off, power tube M1 two ends pressure drop reduces suddenly.
When input voltage vin continues to increase, as input voltage increases to 120V, when pull-up resistor is 500 Ω, now steady current Io is after pull-up resistor RL, at the voltage of VM point for draw according to formula (3), VM point voltage is 70V, pressure drop on power tube VM1 is determined according to formula (6), if steady current Io continues to flow to ground from switching tube M2, then VM1 is 70V, and in fact voltage detecting circuit detects that input voltage is after the magnitude of voltage of 120V and VM point, because input voltage is still in the state of increase, therefore, voltage detecting circuit maintains the cut-off state of switching tube M2, after steady current Io flows through power tube M1, switching tube M2 is still cut-off state, steady current Io holds through non-essential resistance Rext with resistance Rcs with flowing to, form path.Because switching tube M2 ends, the passable maximum dividing potential drop of non-essential resistance Rext is 50V, so power tube M1 needs dividing potential drop 20V, namely VM1 is reduced to 20V (50V be assume responsibility for by non-essential resistance) from 70V originally.After voltage detecting circuit detects the magnitude of voltage of VM point, by error amplifier EA, feedback voltage V cs was amplified with comparing of reference level Vref, the resistance of power tube M1 is modulated, the resistance of power tube M1 is made to start to increase, when steady current Io flows through power tube M1, the voltage of 20V will be born, produce the power of 2W, non-essential resistance Rext bears the voltage of 50V, produce the power of 5W, because non-essential resistance Rext is in the outside of integrated circuit, radiating condition is relatively good, ramp case can not be very serious, and, if when the power consumption of non-essential resistance Rext is excessive, also non-essential resistance Rext can be designed to by the structure of multiple resistor coupled in parallel, Rext1, Rext2, ... Rextn shares power consumption jointly, further reduction temperature.
When input voltage vin starts to decline, and when voltage detecting circuit detects the pressure drop VM1 at power tube M1 two ends lower than threshold voltage VMT, voltage detecting circuit is again by switching tube M2 conducting, and steady current Io flows through from power switch M2, bears unnecessary VM voltage by power tube M1.
According to the multiple situation described of illustrating above, the design load of circuit optimization draws according to following formula: the maximal value of getting input voltage vin is Vin_max,
Then maximum VM_max voltage=Vin_max-VL (7)
Then set threshold voltage VMT=VM_max/2 (8)
Again according to (5) formula, calculate the resistance of required non-essential resistance Rext.
It should be noted that, the power consumption of the power tube that the design load optimized according to above-mentioned formula can reduce in linear constant-current modulation circuit is more than half, and power consumption is reasonably distributed between internal power pipe and non-essential resistance Rext, make the temperature rise of each device in controllable scope, improve the Stability and dependability of system works.
Fig. 5 is another linear constant-current modulation circuit provided by the invention; Below in conjunction with Fig. 4, the course of work of the testing circuit of Fig. 5 is specifically described.
The principle of embodiment of the present invention linear constant-current modulation circuit is, first according to the range set threshold voltage VMT of the input voltage of user, as can be seen from Figure 4, the voltage (drain voltage of power tube M1) of VM point is identical with the change of input voltage, in embodiments of the present invention, voltage detecting circuit only need detect VM point voltage, according to conducting or the cut-off state of VM point voltage gauge tap pipe M2.
When VM point voltage is lower, the pressure drop VM1 at power tube M1 two ends is lower than the threshold voltage VMT set, switching tube M2 conducting, because the conducting resistance Rdson2 of switching tube M2 is smaller, be far smaller than the conducting resistance Rdson1 of power tube M1, then the voltage at VM point place, all drop on power tube M1, steady current Io holds from pull-up resistor RL through power tube M1, switching tube M2 and resistance Rcs with flowing to, and forms path.When VM point voltage continues to increase, make the pressure drop VM1 at power tube M1 two ends reach threshold voltage VMT, switching tube M2 turns off by voltage detecting circuit, and make switching tube M2 be cut-off state, then steady current Io flows through from non-essential resistance Rext.
Therefore, when switching tube M2 ends, steady current Io flows through from non-essential resistance Rext, and non-essential resistance Rext bears the part pressure drop of VMT, and now, the pressure drop on power tube reduces according to the pressure drop born of non-essential resistance Rext of design, can be reduced to zero in theory.If VM point voltage continues to increase, by error amplifier EA, feedback voltage V cs was amplified with comparing of reference level Vref, the resistance of power tube M1 is modulated, make the resistance of power tube M1 start to increase, the voltage drop that it is born is corresponding increase also, bears unnecessary voltage drop.
When VM point voltage declines, the pressure drop VM1 at power tube M1 two ends is lower than threshold voltage VMT, and by switching tube M2 conducting, the conducting resistance Rdson2 due to switching tube M2 is far smaller than non-essential resistance Rext, now electric current I o flows through from switching tube M2 again, and power tube M1 bears unnecessary VM voltage.
The above-mentioned all kinds of power tubes mentioned in embodiments of the present invention, can use ambipolar (BJT) power tube, can be MOS type power tube, also can be the power tube of other types.
In embodiments of the present invention, to illustrate working condition of the present invention, wherein, input voltage, threshold voltage and pull-up resistor are and illustrate, the resistance of pull-up resistor is in embodiments of the present invention for 500 Ω, and in actual applications, the resistance of pull-up resistor can change among a small circle, therefore, to calculate according to the resistance of concrete pull-up resistor in the calculation.
Above-described embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only the specific embodiment of the present invention; the protection domain be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a linear constant-current modulation circuit, comprises voltage detecting circuit, power tube (M1), switching tube (M2) and some resistance (Rext);
Described power tube (M1) and described switching tube (M2) are connected in series;
Described switching tube (M2) and described some resistance (Rext) are connected in parallel;
Described voltage detecting circuit detects the voltage difference (VM1) at described power tube (M1) two ends, when described voltage difference (VM1) exceedes default threshold voltage (VMT), it is cut-off state that described voltage detecting circuit controls described switching tube (M2).
2. a kind of linear constant-current modulation circuit as claimed in claim 1, it is characterized in that, described voltage detecting circuit detects the voltage difference (VM1) at described power tube (M1) two ends, detect the input voltage of described linear constant-current modulation circuit, when described voltage difference (VM1) exceedes default threshold voltage (VMT), it is cut-off state that described voltage detecting circuit controls described switching tube (M2), utilizes described input voltage to maintain the cut-off state of described switching tube (M2).
3. a kind of linear constant-current modulation circuit as claimed in claim 1, is characterized in that, described circuit also comprises load device, and described load device and described power tube (M1) are connected in series.
4. a kind of linear constant-current modulation circuit as claimed in claim 3, is characterized in that, described load device is resistance or LED.
5. a kind of linear constant-current modulation circuit as claimed in claim 1, it is characterized in that, described circuit also comprises error amplifier (EA), first input voltage of described error amplifier (EA) is reference voltage (Vref), second input voltage of described error amplifier (EA) is feedback voltage (Vcs), and the output terminal of described error amplifier (EA) is connected with the grid of described power tube (M1);
Described error amplifier (EA), by amplifying with comparing of described feedback voltage (Vcs) described reference voltage (Vref), adjusts the resistance of described power tube (M1).
6. a kind of linear constant-current modulation circuit as claimed in claim 1, it is characterized in that, when described voltage difference (VM1) is no more than described default threshold voltage (VMT), it is conducting state that described voltage detecting circuit controls described switching tube (M2), and the steady current (Io) of described linear constant-current modulation circuit flows to ground end by switching tube (M2).
7. a kind of linear constant-current modulation circuit as claimed in claim 1, is characterized in that, described power tube be following any one:
Bipolar-type power pipe, fet power pipe.
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| CN106502295A (en) * | 2016-11-05 | 2017-03-15 | 上海大学 | A kind of Constant Current Control System |
| CN113891523B (en) * | 2020-07-03 | 2023-09-05 | 酷矽半导体科技(上海)有限公司 | Driving circuit, driving chip, driving system and driving method suitable for pulsating voltage |
| CN112817359B (en) * | 2020-12-29 | 2021-12-21 | 中船重工安谱（湖北）仪器有限公司 | High-stability constant current source with wide load range |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207950A (en) * | 2006-12-20 | 2008-06-25 | 钰瀚科技股份有限公司 | System, redundant circuit and method for driving light emitting diode |
| CN101261526A (en) * | 2008-04-17 | 2008-09-10 | 上海威廉照明电气有限公司 | Enhancement type voltage regulation constant-current device and constant current source constituted by same |
| CN101504557A (en) * | 2008-09-25 | 2009-08-12 | 数能科技股份有限公司 | Constant current element construction in tandem connection, and circuit employing the same |
| JP2014082226A (en) * | 2011-09-30 | 2014-05-08 | Panasonic Corp | Constant current drive device, and load drive device using the same |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10215084A1 (en) * | 2002-04-05 | 2003-10-30 | Infineon Technologies Ag | Circuit arrangement for voltage regulation |
| US8791674B2 (en) * | 2010-07-16 | 2014-07-29 | Analog Devices, Inc. | Voltage regulating circuit and a method for producing a regulated DC output voltage from an unregulated DC input voltage |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207950A (en) * | 2006-12-20 | 2008-06-25 | 钰瀚科技股份有限公司 | System, redundant circuit and method for driving light emitting diode |
| CN101261526A (en) * | 2008-04-17 | 2008-09-10 | 上海威廉照明电气有限公司 | Enhancement type voltage regulation constant-current device and constant current source constituted by same |
| CN101504557A (en) * | 2008-09-25 | 2009-08-12 | 数能科技股份有限公司 | Constant current element construction in tandem connection, and circuit employing the same |
| JP2014082226A (en) * | 2011-09-30 | 2014-05-08 | Panasonic Corp | Constant current drive device, and load drive device using the same |
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