CN104345764A - Constant-flow source - Google Patents
Constant-flow source Download PDFInfo
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- CN104345764A CN104345764A CN201410625849.8A CN201410625849A CN104345764A CN 104345764 A CN104345764 A CN 104345764A CN 201410625849 A CN201410625849 A CN 201410625849A CN 104345764 A CN104345764 A CN 104345764A
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Abstract
The application provides a constant-flow source, comprising a constant-flow source circuit and a controller, wherein the controller is connected with an input end of the constant-flow source circuit; the controller is used for outputting an alternating current signal with a preset frequency; the constant-flow source outputs the alternating current signal with the preset frequency through the controller after passing through the constant-flow source circuit to obtain an alternating current constant-flow signal with the required frequency, so that the frequency of the alternating current constant-flow source is not limited by 50Hz of power frequency and can be adjusted according to the actual requirements.
Description
Technical field
The application relates to switch power technology field, particularly relates to a kind of constant current source.
Background technology
Along with the development of modern technologies, the application of constant current source also becomes important day by day, if robot, industrial automation, satellite communication, power communication, intelligent instrumentation and other digital control field are all in the urgent need to using constant current circuit.Therefore, research and develop constant-current circuit tool to be of great significance.Many occasions, especially high accuracy measurement and control system needs high-precision voltage source and current source, simultaneously, the high speed development of microelectronic technique, to we providing many miniaturizations, integrated high precision electro potential source, but for current source, the high-precision current source that especially working current is large still needs user's designed, designed to realize.
Application number be 201110086911.7 patent of invention disclose a kind of by input AC signal element, input stage EMI filter unit, rectification circuit unit, PFC testing circuit unit, main control loop unit, main switch circuit unit, transformer isolation circuit unit, the AC constant-current source of output rectification filter unit and current sample control loop unit composition, this invention has low cost, institute takes up space the advantage such as little, but, its weak point is, because its AC signal is provided by 220V/50Hz AC power, therefore its AC constant-current source can only export the power frequency component of 50Hz, the frequency of constant current source signal cannot be regulated.
Summary of the invention
In view of this, the application provides a kind of constant current source, with overcome constant current source of the prior art can only export 50Hz power frequency component and cannot the problem of frequency of regulation output constant current source signal.
For achieving the above object, the application provides following technical scheme:
A kind of constant current source, comprising: constant-current source circuit and the controller be connected with the input end of described constant-current source circuit;
Wherein, described controller is for exporting the AC signal of predeterminated frequency.
Preferably, described controller comprises: micro-control unit MCU and Direct Digital Synthesizer DDS;
Wherein, described MCU exports the AC signal of predeterminated frequency for controlling described DDS.
Preferably, described controller also comprises: the digital to analog converter DAC be connected with described MCU and described DDS respectively;
Wherein, described DAC is for controlling the amplitude of the AC signal of described DDS output;
Described MCU also controls the output current of described DDS for the output voltage by controlling described DAC.
Preferably, also comprise: bandpass filter, carry out filtering process for the AC signal exported described controller, obtain the AC signal after filtering process.
Preferably, described wave filter is Butterworth second-order bandpass filter.
Preferably, also comprise: the instrument amplifier be connected with described bandpass filter and described constant-current source circuit respectively, for amplifying preset multiple to the amplitude of the AC signal after described filtering process.
Preferably, also comprise: the current collector be connected with output terminal and the described controller of described constant-current source circuit respectively, for gathering the current value of constant current source, and feeds back to described controller by described current value;
Described controller is also for carrying out the dynamic adjustments of electric current according to the feedback signal obtained.
Preferably, described current collector comprises: sampling resistor and sample circuit;
Wherein, described sample circuit calculates the current value of described constant current source according to the voltage drop at the described sampling resistor two ends collected.
Preferably, described sample circuit comprises: differential amplifier and RMS-DC converter chip.
Preferably, described sampling resistor is Low Drift Temperature sampling resistor.
From above technical scheme, this application provides a kind of constant current source, comprising: constant-current source circuit and the controller be connected with the input end of described constant-current source circuit; Wherein, described controller is for exporting the AC signal of predeterminated frequency.The AC signal that this constant current source exports predeterminated frequency by controller exports after constant-current source circuit, obtains the interchange constant current signal of required frequency, makes the frequency of AC constant-current source no longer be confined to work frequency 50Hz, but can regulate according to actual needs.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
The schematic diagram of a kind of constant current source that Fig. 1 provides for the embodiment of the present application one;
The schematic diagram of a kind of constant-current source circuit that Fig. 2 provides for the embodiment of the present application one;
The structural representation of a kind of controller that Fig. 3 provides for the embodiment of the present application one;
The schematic diagram of a kind of constant current source that Fig. 4 provides for the embodiment of the present application two;
The structural representation of a kind of controller that Fig. 5 provides for the embodiment of the present application two;
The structural representation of a kind of current collector that Fig. 6 provides for the embodiment of the present application two.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For overcome constant current source of the prior art can only export 50Hz power frequency component and cannot the problem of frequency of regulation output constant current source signal, this application provides a kind of constant current source, concrete scheme is as described below:
Embodiment one
As shown in Figure 1, a kind of schematic diagram of constant current source that provides for the embodiment of the present application one of Fig. 1.This constant current source comprises: constant-current source circuit 101 and the controller 102 be connected with the input end of constant-current source circuit 101.
As shown in Figure 2, a kind of schematic diagram of constant-current source circuit that provides for the embodiment of the present application one of Fig. 2.In this application, constant-current source circuit adopts classical constant-current source circuit, and the OPA551 of TI company selected by the amplifier in constant-current source circuit.Wherein, the formula that steady current produces is I
o=U
i/ R
o.Constant current source signal frequency adjustable extent in the application is 1Hz ~ 1MHz, and wherein, frequency is for presetting.
Wherein, controller 102 is for exporting the AC signal of predeterminated frequency.
As shown in Figure 3, a kind of structural representation of controller that provides for the embodiment of the present application one of Fig. 3.In the present embodiment, controller comprises: micro-control unit MCU301 and Direct Digital Synthesizer DDS302.
Wherein, MCU301 exports the AC signal of predeterminated frequency for control DDS302.
Concrete, as mentioned above, constant current source signal frequency adjustable extent in the application is 1Hz ~ 1MHz, first by pre-set for required frequency, export the AC signal of predeterminated frequency by MCU301 by SPI (Serial Peripheral interface, Serial Peripheral Interface) bus marco DDS302, take MCU pin and system resource less, less demanding to MCU, the chips such as ARM7 can realize this AC constant-current source.
In this application, DDS302 can adopt the DDS chip AD9834 of AD company, does not limit at this.
From above technical scheme, the embodiment of the present application one provides a kind of constant current source, comprising: constant-current source circuit and the controller be connected with the input end of described constant-current source circuit; Wherein, described controller is for exporting the AC signal of predeterminated frequency.The AC signal that this constant current source exports predeterminated frequency by controller exports after constant-current source circuit, obtain the interchange constant current signal of required frequency, the frequency of AC constant-current source is made no longer to be confined to work frequency 50Hz, but can regulate according to actual needs, and, only need be controlled by spi bus, take MCU pin and system resource less, less demanding to MCU, the chips such as ARM7 can realize this AC constant-current source.
Embodiment two
As shown in Figure 4, a kind of schematic diagram of constant current source that provides for the embodiment of the present application two of Fig. 4.This constant current source comprises: controller 401, bandpass filter 402, instrument amplifier 403, constant-current source circuit 404 and current collector 405.
Controller 401 is for exporting the AC signal of predeterminated frequency.
In the present embodiment, controller 401 can controller as described in embodiment one, also can be other.As shown in Figure 5, a kind of structural representation of controller that provides for the embodiment of the present application two of Fig. 5.This controller comprises: micro-control unit MCU501, digital to analog converter DAC502 and Direct Digital Synthesizer DDS503.
Wherein, MCU501 is connected with DAC502 by spi bus, for carrying out the output current of control DDS503 further by the output voltage of control DAC502.
MCU501 is connected with DDS503 by spi bus, exports the AC signal of predeterminated frequency for control DDS502.
DAC502 and DDS503 is connected, for controlling the amplitude size of sinusoidal ac signal, i.e. and the amplitude of the AC signal of control DDS503 output; .
In this application, DAC502 can adopt the DAC chip AD5620 of AD company, and DDS503 can adopt the DDS chip AD9834 of AD company, does not limit at this.The two forms exiting signal generating circuit jointly, and by the output current size of the output voltage control AD9834 of control AD5620, formula is I
oUT=18 (V
ref-V
dAC)/6.8k Ω, then by the output signal frequency of MCU control AD9834, required sinusoidal ac signal can be obtained.
Bandpass filter 402 is specifically connected with the DDS in controller 401, carries out filtering process, obtain the AC signal after filtering process for the AC signal exported controller 401.
Because the noise in output signal of AD9834 chip is larger, filtering circuit or bandpass filter need be adopted to carry out filtering to it, the application specifically can adopt Butterworth second-order bandpass filter offset of sinusoidal AC signal to carry out filtering, and this is not restricted, can also be other wave filters.
The instrument amplifier 403 be connected with bandpass filter 402 and constant-current source circuit 403 respectively, for amplifying preset multiple to the amplitude of the AC signal after filtering process.
Concrete, in the present embodiment, instrument amplifier 403 can be selected as required, if do not need, can remove, and namely instrument amplifier 403 can carry out selecting or abandoning according to actual needs.Mainly in order to filtered AC signal being carried out the suitable amplification of amplitude.
Constant-current source circuit adopts classical constant-current source circuit, concrete, can comply with as shown in Figure 2.The OPA551 of TI company selected by amplifier in constant-current source circuit.Wherein, the formula that steady current produces is I
o=U
i/ R
o.
The current collector be connected with the output terminal of constant-current source circuit 404 and the MCU of controller 401 respectively, for gathering the current signal of constant current source, and current signal being fed back to the MCU of controller 401, MCU is used for the dynamic adjustments of carrying out electric current according to the feedback signal obtained.
Concrete, as shown in Figure 6, the structural representation of a kind of current collector that Fig. 6 provides for the embodiment of the present application two.Current collector comprises: sampling resistor 601 and sample circuit 602.
Wherein, sample circuit 602 calculates the current value of constant current source according to the voltage drop at sampling resistor 601 two ends collected.
Concrete, sampling resistor 601 is connected with the output terminal of constant-current source circuit, through over-sampling circuit 602, the current signal feedback collected is understood the MCU of controller.Constant current source feeds back to MCU by sampling resistor and sample circuit, the current value of current output can be obtained, the feedback signal utilizing MCU to obtain and initialize signal comparison, carry out dynamic adjustments, and namely MCU can be regulated by comparison function, value as feedback signal is large, carried out the output voltage of regulating and controlling AD5620 by MCU inside programming, turned down, until meet the requirements, thus the size of the AC constant-current source of regulation output, thus reach the object of stable constant current signal.
Constant current source signal frequency adjustable extent in the application is 1Hz ~ 1MHz, 1mA ~ 200mA, and wherein, frequency is for presetting, and electric current can dynamic adjustments at work, can adapt to the demand of all kinds of exciting signal source.
Concrete, in the present embodiment, sample circuit is made up of differential amplifier and RMS-DC converter chip.
In the present embodiment, sinusoidal ac signal is produced by AD9834, AD5620 regulates the amplitude of sinusoidal signal, by entering constant-current source circuit after second order Butterworth bandpass filter, produce AC signal, by sample circuit, interchange constant current signal is fed back to MCU again, thus reach the object of dynamic adjustment.
The constant current source that the application provides can the size of in use dynamic conditioning constant current source signal, adopts the sampling resistor of Low Drift Temperature effectively significantly can fall the impact of Low Drift Temperature, therefore has higher degree of stability.And, conveniently can change frequency and the size of output current signal at work, the demand of variety classes pumping signal can be met.
The application only need be controlled by spi bus, take MCU pin and system resource less, less demanding to MCU, the chips such as ARM7 can realize this dynamically programmable AC constant-current source.
From above technical scheme, the embodiment of the present application two provides a kind of constant current source, comprising: controller, bandpass filter, instrument amplifier, constant-current source circuit and current collector; Wherein, described controller for exporting the AC signal of predeterminated frequency, and carries out the dynamic adjustments of electric current according to the signal of current collector feedback; Described bandpass filter is used for carrying out filtering process to the AC signal that described controller exports, and obtains the AC signal after filtering process; Described instrument amplifier is used for amplifying preset multiple to the amplitude of the AC signal after described filtering process; Described current signal for gathering the current signal of constant current source, and is fed back to described controller by described current collector.The AC signal that this constant current source exports predeterminated frequency by controller exports after constant-current source circuit, obtain the interchange constant current signal of required frequency, the frequency of AC constant-current source is made no longer to be confined to work frequency 50Hz, but can regulate according to actual needs, and, controller achieves the dynamic adjustments to electric current by the feedback signal of current collector, and only need be controlled by spi bus, take MCU pin and system resource less, less demanding to MCU, the chips such as ARM7 can realize this dynamically programmable AC constant-current source.
Finally, also it should be noted that, in this article, the such as relational terms of first and second grades and so on is only used for an entity or operation to separate with another entity or operational zone, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
In this instructions, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the application.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the application, can realize in other embodiments.Therefore, the application can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a constant current source, is characterized in that, comprising: constant-current source circuit and the controller be connected with the input end of described constant-current source circuit;
Wherein, described controller is for exporting the AC signal of predeterminated frequency.
2. constant current source according to claim 1, is characterized in that, described controller comprises: micro-control unit MCU and Direct Digital Synthesizer DDS;
Wherein, described MCU exports the AC signal of predeterminated frequency for controlling described DDS.
3. constant current source according to claim 2, is characterized in that, described controller also comprises: the digital to analog converter DAC be connected with described MCU and described DDS respectively;
Wherein, described DAC is for controlling the amplitude of the AC signal of described DDS output;
Described MCU also controls the output current of described DDS for the output voltage by controlling described DAC.
4. the constant current source according to claims 1 to 3 any one, is characterized in that, also comprises: bandpass filter, carries out filtering process, obtain the AC signal after filtering process for the AC signal exported described controller.
5. constant current source according to claim 4, is characterized in that, described wave filter is Butterworth second-order bandpass filter.
6. constant current source according to claim 4, is characterized in that, also comprises: the instrument amplifier be connected with described bandpass filter and described constant-current source circuit respectively, for amplifying preset multiple to the amplitude of the AC signal after described filtering process.
7. constant current source according to claim 4, it is characterized in that, also comprise: the current collector be connected with output terminal and the described controller of described constant-current source circuit respectively, for gathering the current signal of constant current source, and feeds back to described controller by described current signal;
Described controller is also for carrying out the dynamic adjustments of electric current according to the feedback signal obtained.
8. constant current source according to claim 7, is characterized in that, described current collector comprises: sampling resistor and sample circuit;
Wherein, described sample circuit calculates the current value of described constant current source according to the voltage drop at the described sampling resistor two ends collected.
9. constant current source according to claim 8, is characterized in that, described sample circuit comprises: differential amplifier and RMS-DC converter chip.
10. constant current source according to claim 8, is characterized in that, described sampling resistor is Low Drift Temperature sampling resistor.
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|---|---|---|---|
| CN201410625849.8A CN104345764A (en) | 2014-11-07 | 2014-11-07 | Constant-flow source |
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|---|---|---|---|
| CN201410625849.8A CN104345764A (en) | 2014-11-07 | 2014-11-07 | Constant-flow source |
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Cited By (8)
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| CN105404343A (en) * | 2015-11-20 | 2016-03-16 | 国网山东省电力公司电力科学研究院 | AC constant current source for current transformer correction |
| CN106487237A (en) * | 2015-08-31 | 2017-03-08 | 中国石油天然气股份有限公司 | Sender unit |
| CN106681415A (en) * | 2016-09-28 | 2017-05-17 | 三峡大学 | Low frequency dual path AC constant current source device |
| CN108776505A (en) * | 2018-06-13 | 2018-11-09 | 常州同惠电子股份有限公司 | A kind of high-precision forward adjustable current source circuit |
| CN110441704A (en) * | 2019-07-23 | 2019-11-12 | 广州供电局有限公司 | Battery detection circuit |
| CN114217659A (en) * | 2021-12-03 | 2022-03-22 | 国网浙江省电力有限公司建德市供电公司 | Voltage-controlled alternating current constant current source circuit and arc suppression coil automatic compensation calibration device |
| CN115046625A (en) * | 2022-07-15 | 2022-09-13 | 中国兵器装备集团自动化研究所有限公司 | Low-frequency weak vibration signal detection system |
| CN115061527A (en) * | 2022-07-28 | 2022-09-16 | 国仪量子(合肥)技术有限公司 | Control method of voltage-controlled current source |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106681415A (en) * | 2016-09-28 | 2017-05-17 | 三峡大学 | Low frequency dual path AC constant current source device |
| CN106681415B (en) * | 2016-09-28 | 2017-11-14 | 三峡大学 | A kind of low frequency double-circuit communication constant-current source device |
| CN108776505A (en) * | 2018-06-13 | 2018-11-09 | 常州同惠电子股份有限公司 | A kind of high-precision forward adjustable current source circuit |
| CN110441704A (en) * | 2019-07-23 | 2019-11-12 | 广州供电局有限公司 | Battery detection circuit |
| CN114217659A (en) * | 2021-12-03 | 2022-03-22 | 国网浙江省电力有限公司建德市供电公司 | Voltage-controlled alternating current constant current source circuit and arc suppression coil automatic compensation calibration device |
| CN115046625A (en) * | 2022-07-15 | 2022-09-13 | 中国兵器装备集团自动化研究所有限公司 | Low-frequency weak vibration signal detection system |
| CN115061527A (en) * | 2022-07-28 | 2022-09-16 | 国仪量子(合肥)技术有限公司 | Control method of voltage-controlled current source |
| CN115061527B (en) * | 2022-07-28 | 2024-02-23 | 国仪量子技术(合肥)股份有限公司 | Control method of voltage-controlled current source |
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