CN103941069A - Method for removing DC bias voltage in AC current sampling process - Google Patents
Method for removing DC bias voltage in AC current sampling process Download PDFInfo
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- CN103941069A CN103941069A CN201310742039.6A CN201310742039A CN103941069A CN 103941069 A CN103941069 A CN 103941069A CN 201310742039 A CN201310742039 A CN 201310742039A CN 103941069 A CN103941069 A CN 103941069A
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Abstract
The invention relates to an AC motor, and particularly relates to DC bias voltage in the AC current sampling process. Provided is a method for removing the DC bias voltage in the AC current sampling process. The method comprises that: an AC current is sent to an analog circuit processing module, and the AC current is converted into an AC voltage signal with superposition of the DC bias voltage via a current sensor and a bias voltage circuit; the AC voltage signal with superposition of the DC bias voltage is converted into a discrete AC signal with DC bias via an analog-to-digital converter in a microprocessor module; and finally a DC discrete signal representing the current size of the DC bias voltage and an AC discrete signal representing the size and frequency of the AC current are obtained after the discrete AC signal with DC bias passes through a closed loop system formed by a subtracter, an integrator and a proportional amplifier so that removing of the DC bias voltage in the AC current sampling process is realized. A DC discrete component can be obtained via the method.
Description
Technical field
The present invention relates to alternating current generator, relate in particular to DC offset voltage in alternating current sampling process.
Background technology
Under normal circumstances, the sampling of alternating current is by AC current sensor, current signal to be converted to ac voltage signal to be sampled by microprocessor, the positive voltage signal and microprocessor can only be sampled under normal circumstances, so ac current signal has added a DC offset voltage in the process that changes into ac voltage signal, (this ac voltage signal comprises sign alternating current size and the continuous component of interchange of frequency and the continuous component of direct current being brought by DC offset voltage to make ac voltage signal be always positive voltage signal, especially, in the time that alternating current is 0, ac voltage signal is shown as d. c. voltage signal, be DC offset voltage signal).The ac voltage signal thereby microcontroller can normally be sampled.
The interchange discrete signal that microprocessor samples ac voltage signal obtains comprises sign alternating current size and the interchange discrete component of frequency and the direct current discrete component of being brought by DC offset voltage, and direct current discrete component is a kind of useless signal in actual application, so we will find out the size of above-mentioned direct current discrete component, then in sampling processing process, it is removed, obtain real sign alternating current size and the discrete component that exchanges of frequency.
The removal method of direct current biasing (direct current discrete component) is under normal circumstances: suppose that the direct current discrete component of being brought by DC offset voltage is a fixed value.Be that (now ac voltage signal was shown as d. c. voltage signal in 0 o'clock at ac current signal, be DC offset voltage signal), microprocessor samples is also recorded current sampled value, the direct current discrete component that this value is brought as DC offset voltage, then after sampling process in deduct appeal sampled value, obtain characterizing the discrete component that exchanges of alternating current size and frequency.But the direct current discrete component that actual conditions are DC offset voltages to be brought is not to be a fixed value, but has certain variation range.For example: DC offset voltage is generally to be provided by stable-pressure device, but along with rising and the reduction of stable-pressure device working temperature, DC offset voltage also can fluctuate in certain scope, also there is conforming problem in the stable-pressure device of same model different batches, so the method is unfavorable for improving the performance of product, neither be very desirable in versatility.And the method can only just can obtain characterizing the direct current discrete component of DC offset voltage size when ac current signal is 0, if now sampled signal is subject to external interference, the direct current discrete component obtaining is so exactly a full of prunes value.
Summary of the invention
The present invention is intended to overcome the defect of prior art, and DC offset voltage removal device in a kind of alternating current sampling process is provided.By the getable direct current discrete component of the present invention.
In order to solve the problems of the technologies described above, a kind of DC offset voltage removal method in alternating current sampling process, it comprises:
Analog circuitry processes module, this module mainly comprises current sensor and bias voltage circuit; With
Microprocessor processes module, microprocessor mainly comprises analog to digital converter, subtracter, integrator and proportional amplifier, subtracter, integrator and proportional amplifier composition closed-loop system;
And comprise the following steps:
Step 1, sends alternating current into analog circuitry processes module, through current sensor and bias voltage circuit, alternating current is changed into the ac voltage signal of the DC offset voltage that superposeed;
Step 2, the analog to digital converter of the ac voltage signal of the DC offset voltage that superposeed in microprocessor module, converts the discrete AC signal with direct current biasing to the ac voltage signal of the DC offset voltage that superposeed;
Step 3, the closed-loop system of discrete AC signal with direct current biasing through being formed by subtracter, integrator and proportional amplifier, finally obtain characterizing the interchange discrete signal of the current direct current discrete signal by DC offset voltage size and sign alternating current size and frequency, thereby realize the removal of DC offset voltage in alternating current sampling process.
It is that the amount that direct current discrete component that DC offset voltage is brought is regarded a variation as is processed that the present invention is different from above-mentioned classic method, obtains characterizing the interchange discrete component of alternating current size and frequency thereby the method for calculating by microprocessor closed loop calculates the size of the current direct current discrete component of being brought by DC offset voltage in real time.Owing to being that closed loop is calculated, the method has improved the computational accuracy of direct current discrete component, thereby has improved current sample precision; Owing to being real-time calculating, the method can real-time calculating characterize the direct current discrete component of current DC offset voltage size and by it removal, improve the antijamming capability of current sample simultaneously in the situation that working environment changes; The method versatility is good, easily realizes.
Key of the present invention is to calculate accurately in real time the direct current discrete component size of being brought by DC offset voltage, then after sampling process in deduct above-mentioned direct current discrete component, obtain characterizing the discrete component that exchanges of alternating current size and frequency, the method has following advantage with respect to traditional method: first, owing to being the calculating of microprocessor real-time closed-loop, the method has improved the computational accuracy of direct current discrete component, thereby has improved current sample precision.The second, owing to being that microprocessor closed loop is calculated, the calculating of direct current discrete component is not vulnerable to extraneous interference.The 3rd, what the method was can be in the situation that working environment changes real-time calculates current direct current discrete component size, improves current sample precision.The 4th, versatility is good, easily realizes.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further illustrated:
Fig. 1 is high-level schematic functional block diagram of the present invention.
Embodiment
As shown in Figure 1, in figure 1 be analog signal processing module, 2 for microprocessor processes module, 3 for current sensor and bias voltage circuit, 4 for subtracter, 5 for integrator, 6 for proportional amplifier, 7 be analog-to-digital conversion module; A is that alternating current, b are that superposeed ac voltage signal, the c of DC offset voltage is to be that to characterize current direct current discrete signal, e by DC offset voltage size be the interchange discrete signal that characterizes alternating current size and frequency with discrete AC signal, the d of direct current biasing.
DC offset voltage removal method in a kind of alternating current sampling process of the present invention, the method needs two main functional modules, first, analog circuitry processes module, this module mainly comprises current sensor and bias voltage circuit, alternating current is changed into the ac voltage signal of the DC offset voltage that superposeed.Second, microprocessor processes module, microprocessor mainly comprises analog to digital converter, subtracter, integrator and proportional amplifier, the stack that wherein analog to digital converter is brought analog circuitry processes module the ac voltage signal of DC offset voltage convert the discrete AC signal with direct current biasing to, subtracter, integrator and proportional amplifier composition closed-loop system, can be to process in real time and calculate the interchange discrete component that characterizes the current direct current discrete component by DC offset voltage size and characterize alternating current size and frequency with the discrete AC signal of direct current biasing.
The concrete steps of implementing the method are:
Step 1, sends alternating current into analog circuitry processes module, through current sensor and bias voltage circuit, alternating current is changed into the ac voltage signal of the DC offset voltage that superposeed.
Step 2, the analog to digital converter of the ac voltage signal of the DC offset voltage that superposeed in microprocessor module, converts the discrete AC signal with direct current biasing to the ac voltage signal of the DC offset voltage that superposeed.
Step 3, chooses suitable proportional amplifier, and the enlargement factor value of proportional amplifier is less, and for example 1/65536.
Step 4, discrete AC signal with direct current biasing is through forming closed-loop system by subtracter, integrator and proportional amplifier, finally obtain characterizing the interchange discrete signal of the current direct current discrete signal by DC offset voltage size and sign alternating current size and frequency, thereby realize the removal of direct current biasing in alternating current sampling process.
Claims (1)
1. DC offset voltage removal method in an alternating current sampling process, is characterized in that, it comprises:
Analog circuitry processes module, this module mainly comprises current sensor and bias voltage circuit; With
Microprocessor processes module, microprocessor mainly comprises analog to digital converter, subtracter, integrator and proportional amplifier, subtracter, integrator and proportional amplifier composition closed-loop system;
And comprise the following steps:
Step 1, sends alternating current into analog circuitry processes module, through current sensor and bias voltage circuit, alternating current is changed into the ac voltage signal of the DC offset voltage that superposeed;
Step 2, the analog to digital converter of the ac voltage signal of the DC offset voltage that superposeed in microprocessor module, converts the discrete AC signal with direct current biasing to the ac voltage signal of the DC offset voltage that superposeed;
Step 3, the closed-loop system of discrete AC signal with direct current biasing through being formed by subtracter, integrator and proportional amplifier, finally obtain characterizing the interchange discrete signal of the current direct current discrete signal by DC offset voltage size and sign alternating current size and frequency, thereby realize the removal of DC offset voltage in alternating current sampling process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310742039.6A CN103941069A (en) | 2013-12-30 | 2013-12-30 | Method for removing DC bias voltage in AC current sampling process |
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| CN201310742039.6A CN103941069A (en) | 2013-12-30 | 2013-12-30 | Method for removing DC bias voltage in AC current sampling process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267230A (en) * | 2014-10-17 | 2015-01-07 | 国家电网公司 | Signal recovery method for passive electronic type voltage transformer |
| CN112051535A (en) * | 2020-09-28 | 2020-12-08 | 珠海格力电器股份有限公司 | Signal determination device, storage medium, and electronic device |
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| CN2060892U (en) * | 1988-12-22 | 1990-08-22 | 清华大学 | Dynamic electricity sensor of closed loop detecting optical fibers of modulated light source |
| US5699011A (en) * | 1996-08-02 | 1997-12-16 | Zenith Electronics Corporation | DC offset compensation method and apparatus |
| CN1286834A (en) * | 1997-11-17 | 2001-03-07 | 艾利森公司 | Modulation system and mehtods including oversampling of narrow bandwidth signals and DC offset compensation |
| CN1602007A (en) * | 2003-09-24 | 2005-03-30 | 三星电子株式会社 | Apparatus for cancellation of DC offset in time division duplexing mode direct conversion receiver |
| CN101436420A (en) * | 2007-11-15 | 2009-05-20 | 株式会社日立制作所 | Offset compensator and optical disc drive using the same |
| CN101937017A (en) * | 2010-08-10 | 2011-01-05 | 珠海中慧微电子有限公司 | Dynamic direct-current removing method for intelligent electric meter during alternating-current sampling |
| CN202421312U (en) * | 2011-12-20 | 2012-09-05 | 首瑞（北京）投资管理集团有限公司 | Device for monitoring alternating current being in series connection with direct current system |
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- 2013-12-30 CN CN201310742039.6A patent/CN103941069A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2060892U (en) * | 1988-12-22 | 1990-08-22 | 清华大学 | Dynamic electricity sensor of closed loop detecting optical fibers of modulated light source |
| US5699011A (en) * | 1996-08-02 | 1997-12-16 | Zenith Electronics Corporation | DC offset compensation method and apparatus |
| CN1286834A (en) * | 1997-11-17 | 2001-03-07 | 艾利森公司 | Modulation system and mehtods including oversampling of narrow bandwidth signals and DC offset compensation |
| CN1602007A (en) * | 2003-09-24 | 2005-03-30 | 三星电子株式会社 | Apparatus for cancellation of DC offset in time division duplexing mode direct conversion receiver |
| CN101436420A (en) * | 2007-11-15 | 2009-05-20 | 株式会社日立制作所 | Offset compensator and optical disc drive using the same |
| CN101937017A (en) * | 2010-08-10 | 2011-01-05 | 珠海中慧微电子有限公司 | Dynamic direct-current removing method for intelligent electric meter during alternating-current sampling |
| CN202421312U (en) * | 2011-12-20 | 2012-09-05 | 首瑞（北京）投资管理集团有限公司 | Device for monitoring alternating current being in series connection with direct current system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104267230A (en) * | 2014-10-17 | 2015-01-07 | 国家电网公司 | Signal recovery method for passive electronic type voltage transformer |
| CN104267230B (en) * | 2014-10-17 | 2018-03-30 | 国家电网公司 | A kind of signal reduction method of passive electronic type voltage transformer |
| CN112051535A (en) * | 2020-09-28 | 2020-12-08 | 珠海格力电器股份有限公司 | Signal determination device, storage medium, and electronic device |
| CN112051535B (en) * | 2020-09-28 | 2021-10-22 | 珠海格力电器股份有限公司 | Signal determination method and device, storage medium and electronic device |
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