CN101763128A - Constant current source - Google Patents
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- CN101763128A CN101763128A CN200910188710A CN200910188710A CN101763128A CN 101763128 A CN101763128 A CN 101763128A CN 200910188710 A CN200910188710 A CN 200910188710A CN 200910188710 A CN200910188710 A CN 200910188710A CN 101763128 A CN101763128 A CN 101763128A
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- 239000003381 stabilizer Substances 0.000 claims abstract description 32
- 239000012530 fluid Substances 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000003044 adaptive effect Effects 0.000 abstract 2
- 230000005611 electricity Effects 0.000 abstract 1
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000007792 addition Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
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Abstract
The present invention discloses a constant current source which consists of a voltage stabilizer, a drive element, a constant feedback unit and a load adaptive feedback unit. The constant feedback unit controls the constant current source to provide constant current for the load, the load adaptive feedback unit controls the output voltage of constant current source to change as the change of load, and thereby realizing the adaptivity of load, enhancing the flexibility of the constant current source and the electricity utilizing efficiency, and reducing the complexity of the thermal design for the system.
Description
Technical field
The invention belongs to power technique fields, particularly the constant current source technical field.
Background technology
Solid state laser usually with laser diode as its pump light source, pump light source whether stablize the performance that directly influences laser, therefore the power supply of powering for laser diode must be a constant current source.Traditional constant current source, adopt voltage stabilizer that driving voltage is provided, connecting load by driving element is laser diode, add feedback loop simultaneously, load current and external setting-up electric current are compared, adjust the drive signal that feedback loop is given driving element according to this comparative result, by the conciliation realization constant current of driving element.Though this constant current source can satisfy the constant requirement of load current, for different loads, need the different constant current source of customization, use very flexible.In order to adapt to the variation of load, usually a given bigger driving voltage when designing this constant current source, but its utilization of power efficient is often lower, when constant current source institute bringing onto load hour, most of electric energy can be converted to heat energy, can strengthen the complexity of system's thermal design thus again.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of constant current source, and this constant current source possesses the function of loaded self-adaptive, can improve dirigibility and utilization of power efficient when using, reduces system's thermal design complexity.
For solving the problems of the technologies described above, the invention provides a kind of constant current source, comprise voltage stabilizer, driving element and constant current feedback unit, described voltage stabilizer provides driving voltage to the series circuit of described driving element and load, described constant current feedback unit detects load current, and provide drive signal to described driving element according to testing result, also comprise: the loaded self-adaptive feedback unit, described loaded self-adaptive feedback unit detects load voltage, and provides the adjustment signal according to testing result to described voltage stabilizer.
As a kind of optimal technical scheme of the present invention, described voltage stabilizer with described series circuit connected mode is: described voltage stabilizer is connected with load by described driving element.
As a kind of optimal technical scheme of the present invention, described voltage stabilizer with described series circuit connected mode is: described voltage stabilizer is connected with described driving element by load.
As a kind of optimal technical scheme of the present invention, described loaded self-adaptive feedback unit comprises the totalizer and second operational amplifier, described totalizer obtains load with described load voltage and predeterminated voltage addition voltage is set, described load is provided with voltage to described second operational amplifier and described driving voltage compares, and provides described adjustment signal to described voltage stabilizer.
As a kind of optimal technical scheme of the present invention, described loaded self-adaptive feedback unit comprises subtracter, totalizer and second operational amplifier, described subtracter subtracts each other the load both end voltage and obtains load voltage, described totalizer obtains load with described load voltage and predeterminated voltage addition voltage is set, described load is provided with voltage to described second operational amplifier and described driving voltage compares, and provides described adjustment signal to described voltage stabilizer.
As a kind of optimal technical scheme of the present invention, described constant current feedback unit comprises the inspection fluid element and first operational amplifier, described inspection fluid element is connected with described series circuit, described first operational amplifier is compressed into row relatively to inspection fluid element voltage and external setting-up Constant Electric Current, provides described drive signal to described driving element.
As a kind of optimal technical scheme of the present invention, described voltage stabilizer is dc conversion modules or the direct current conversion chip with Adjustable Output Voltage function.
As a kind of optimal technical scheme of the present invention, described driving element is bipolar transistor or MOSFET pipe.
As a kind of optimal technical scheme of the present invention, described inspection fluid element is resistance or Hall element.
As a kind of optimal technical scheme of the present invention, described predeterminated voltage is greater than the operating voltage of described driving element.
Constant current source of the present invention is under the control of above-mentioned feedback unit, not only realize the function that output current is constant, and its output voltage also can change with the variation of load, realize the function of loaded self-adaptive, thereby improved the dirigibility and the utilization of power efficient of its use, reduced system's thermal design complexity.
Description of drawings
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.
Fig. 1 is constant current source embodiment one schematic diagram of the present invention;
Fig. 2 is constant current source embodiment two schematic diagrams of the present invention;
Fig. 3 is constant current source of the present invention and traditional constant current source utilization of power efficient comparison diagram.
Embodiment
As shown in Figure 1, 2, constant current source of the present invention is made up of voltage stabilizer 1, driving element 2, constant current feedback unit 3 and loaded self-adaptive feedback unit 4.Dc conversion modules or the direct current conversion chip of voltage stabilizer 1 for having the Adjustable Output Voltage function, driving element 2 are bipolar transistor or MOSFET pipe.The series circuit 6 that voltage stabilizer 1 is formed to driving element 2 and load 5 provides driving voltage Vdd, constant current feedback unit 3 detects load current, and provide drive signal to driving element 2 according to testing result, adjust the output signal of driving element 2, self-adaptation feedback unit 4 detects load voltage, and provide the adjustment signal to voltage stabilizer 1 according to testing result, adjust the output signal of voltage stabilizer 1.
As shown in Figure 1, when driving element 2 was positive-negative-positive bipolar transistor or P channel-type MOSFET pipe, voltage stabilizer 1 connect load 5 by driving element 2; As shown in Figure 2, when driving element 2 was bipolar npn transistor npn npn or N channel-type MOSFET pipe, voltage stabilizer 1 connect driving element 2 by load 5.
As shown in Figure 1, 2, constant current feedback unit 3 comprises the inspection fluid element 7 and first operational amplifier 8.Inspection fluid element 7 is resistance or Hall element.Inspection fluid element 7 is connected with series circuit 6, load current produces the magnitude of voltage V1 corresponding to its size of current by inspection fluid element 7, the size of constant current source constant current is set by external setting-up constant current voltage V2, as two input signals of first operational amplifier 8, the output signal of first operational amplifier 8 is as the drive signal of driving element 2 respectively for V1, V2.V1, V2 compare by first operational amplifier 7, as V1 during greater than V2, first operational amplifier 8 reduces to export to the drive signal of driving element 2 automatically, as V1 during less than V2, first operational amplifier 8 increases the drive signal of exporting to driving element 2 automatically, driving element 2 output signals reduce or increase and respective change realizes constant current thus with drive signal.
As shown in Figure 1, when driving element 2 is positive-negative-positive bipolar transistor or P channel-type MOSFET pipe, self-adaptation feedback unit 4 comprises the totalizer 9 and second operational amplifier 10, because the resistance of inspection fluid element 7 is far smaller than the resistance of load 5, therefore the pressure drop of examining on the fluid element 7 can be ignored, and driving element 2 promptly can be used as load voltage Vload with the voltage of load 5 junctions.As shown in Figure 2, when driving element 2 was bipolar npn transistor npn npn or N channel-type MOSFET pipe, self-adaptation feedback unit 4 also comprised subtracter 11, and the voltage at load 5 two ends subtracts each other by subtracter 11 and obtains load voltage Vload.
As shown in Figure 1, 2, a given predeterminated voltage Vx, to guarantee the operate as normal of driving element 2, the Vx value is greater than the operating voltage of driving element 2, and concrete numerical value is set according to different application demands.Load voltage Vload and predeterminated voltage Vx are by totalizer 9 additions, produce load voltage Vload+Vx is set, as two input signals of second operational amplifier 10, the output signal of second operational amplifier 10 is as the adjustment signal of voltage stabilizer 1 respectively for this voltage and driving voltage Vdd.Vload+Vx and Vdd compare by second operational amplifier 10, as Vdd during greater than Vload+Vx, second operational amplifier 10 reduces to export to the adjustment signal of voltage stabilizer 1 automatically, thereby reduce Vdd, as Vdd during less than Vload+Vx, second operational amplifier 10 increases the adjustment signals of exporting to voltage stabilizer 1 automatically, thereby increases Vdd, guarantee that thus Vdd always equals Vload+Vx, realize the loaded self-adaptive function.
Constant current source utilization of power efficient E=load voltage Vload/ driving voltage Vdd.Setting traditional current source loads voltage is Vload1, and driving voltage is K1, and utilization of power efficient is E1, then E1=Vload1/K1.Setting current source loads voltage of the present invention is Vload2, predeterminated voltage Vx=K2, and driving voltage≤K1, Vload2+K2≤K1 then, i.e. Vload2+K2-K1≤0, setting its utilization of power efficient is E2, then E2=Vload2/ (Vload2+K2).When two kinds of constant current sources drive same load, when being Vload1=Vload2=V0, calculating can get: E1-E2=V0 * (V0+K2-K1)/(K1 * V0+K1 * K2), V0, K1, K2 are the numerical value greater than zero, and V0+K2-K1≤0, so E1-E2≤0, promptly the utilization of power efficient of traditional constant current source will be lower than the utilization of power efficient of constant current source of the present invention.
With reference to figure 3, the curve map that experimentizes and draw after the contrast with regard to utilization of power efficient for traditional constant current source and constant current source of the present invention.Get traditional constant current source driving voltage=10V, constant current source driving voltage≤10V of the present invention, Vx=1V.Experimental results show that when load voltage Vload identical, promptly two constant current sources drive under the equally loaded situation, the utilization of power efficient of constant current source of the present invention will be far longer than the utilization of power efficient of traditional constant current source.
Claims (10)
1. constant current source, comprise voltage stabilizer, driving element and constant current feedback unit, described voltage stabilizer provides driving voltage to the series circuit of described driving element and load, described constant current feedback unit detects load current, and provide drive signal to described driving element according to testing result, it is characterized in that, also comprise: the loaded self-adaptive feedback unit, described loaded self-adaptive feedback unit detects load voltage, and provides the adjustment signal of regulating described driving voltage to described voltage stabilizer according to testing result.
2. constant current source according to claim 1 is characterized in that, described voltage stabilizer with described series circuit connected mode is: described voltage stabilizer is connected with load by described driving element.
3. constant current source according to claim 1 is characterized in that, described voltage stabilizer with described series circuit connected mode is: described voltage stabilizer is connected with described driving element by load.
4. constant current source according to claim 2, it is characterized in that, described loaded self-adaptive feedback unit comprises the totalizer and second operational amplifier, described totalizer obtains load with described load voltage and predeterminated voltage addition voltage is set, described load is provided with voltage to described second operational amplifier and described driving voltage compares, and provides described adjustment signal to described voltage stabilizer.
5. constant current source according to claim 3, it is characterized in that, described loaded self-adaptive feedback unit comprises subtracter, totalizer and second operational amplifier, described subtracter subtracts each other the load both end voltage and obtains load voltage, described totalizer obtains load with described load voltage and predeterminated voltage addition voltage is set, described load is provided with voltage to described second operational amplifier and described driving voltage compares, and provides described adjustment signal to described voltage stabilizer.
6. constant current source according to claim 1, it is characterized in that, described constant current feedback unit comprises the inspection fluid element and first operational amplifier, described inspection fluid element is connected with described series circuit, described first operational amplifier is compressed into row relatively to inspection fluid element voltage and external setting-up Constant Electric Current, provides described drive signal to described driving element.
7. constant current source according to claim 1 is characterized in that, described voltage stabilizer is dc conversion modules or the direct current conversion chip with Adjustable Output Voltage function.
8. constant current source according to claim 1 is characterized in that, described driving element is bipolar transistor or MOSFET pipe.
9. constant current source according to claim 1 is characterized in that, described inspection fluid element is resistance or Hall element.
10. according to claim 4 or 5 described constant current sources, it is characterized in that described predeterminated voltage is greater than the operating voltage of described driving element.
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| CN2009101887100A CN101763128B (en) | 2009-12-03 | 2009-12-03 | Constant current source |
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| CN2009101887100A CN101763128B (en) | 2009-12-03 | 2009-12-03 | Constant current source |
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| CN103049033A (en) * | 2011-10-12 | 2013-04-17 | 欧司朗股份有限公司 | Constant current source circuit and sampling circuit |
| CN103455072A (en) * | 2012-06-05 | 2013-12-18 | 国民技术股份有限公司 | Adaptive bias circuit and voltage stabilizing circuit |
| CN104063004A (en) * | 2013-03-22 | 2014-09-24 | 国民技术股份有限公司 | Self-adaption regulating circuit of constant current source, method and chip |
| CN104252192A (en) * | 2013-06-28 | 2014-12-31 | 索尼公司 | Voltage detector, electronic device, and control method of voltage detector |
| TWI470393B (en) * | 2012-05-22 | 2015-01-21 | Integrated Solutions Technology Inc | Load-adaptive power generator |
| CN105764177A (en) * | 2014-12-15 | 2016-07-13 | 青岛海信宽带多媒体技术有限公司 | Driving method and driving circuit of laser in optical module |
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| CN109346908A (en) * | 2018-12-26 | 2019-02-15 | 吉林大学 | A kind of portable high-efficiency rate laser pump (ing) source module |
| CN109346918A (en) * | 2018-12-26 | 2019-02-15 | 吉林大学 | A kind of portable impedance self-adaptive laser diode drive module |
| CN109358695A (en) * | 2018-12-26 | 2019-02-19 | 吉林大学 | A kind of loaded self-adaptive constant-current source device |
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| US9024608B2 (en) | 2012-05-22 | 2015-05-05 | Integrated Solutions Technology Inc. | Load-adaptive power generator for driving a load device |
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Address after: 518051 Dazu laser building, 9 new West Road, North Nanshan District high tech park, Shenzhen, Guangdong Patentee after: HAN'S LASER TECHNOLOGY INDUSTRY GROUP Co.,Ltd. Address before: 518055 new West Road, North District, Nanshan District high tech park, Shenzhen, Guangdong, 9 Patentee before: HAN'S LASER TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20120314 |