CN102645576B - Device and method for detecting zero crossing point of inductive current - Google Patents
Device and method for detecting zero crossing point of inductive current Download PDFInfo
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- CN102645576B CN102645576B CN201210153027.5A CN201210153027A CN102645576B CN 102645576 B CN102645576 B CN 102645576B CN 201210153027 A CN201210153027 A CN 201210153027A CN 102645576 B CN102645576 B CN 102645576B
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Abstract
The invention provides a device for detecting a zero crossing point of inductive current, aiming at the technical problem that the direction of inductive current can not be accurately judged by independently adopting a digital signal processor (DSP) hardware capture module (CAP) and a hysteresis comparison method. The device comprises a current sensor, a partial pressure conditioning module, a voltage following module, a pull-up bias module, a DSP module, an input module and a liquid crystal display (LCD) module. According to the invention, the phase locking function of a single-phase phase-locked loop based on a second-order generalized integrator (SOGI) is adopted, so that the phase locking for the inductive current can be realized, and the zero crossing point and the direction of the inductive current can be further detected. Through the device, the defects that separately using a hardware or software method is adopted are overcome; and equipment is simple, detection is convenient and fast and reliability is high.
Description
Technical field
The invention belongs to electric circuit inspection technical field, relate in particular to a kind of pick-up unit and detection method that judges the inductive current zero crossing of direction of current.
Background technology
Inductive current is the pulsating current of switching frequency level, and inductive current ripple is larger, and at zero point, the zero crossing at place will be more.How accurately judging inductive current direction, particularly in the occasion of dead area compensation, is the difficult point that we study.At present the method for judgement inductive current direction has two kinds: the hardware trapping module (CAP) in a kind of DSP of use module directly and null value comparison, but this kind of method is on hardware, to have adopted low-pass filter, the signal detecting has been caused to time delay, caused accurately judging zero crossing and the direction of electric current; Another kind method is to adopt stagnant chain rate method, but in real system, ripple size is along with inductance size, degree of modulation change and change, and this just causes stagnant ring ring width to be difficult to determine, and the also as easy as rolling off a log shake back and forth that causes zero crossing of this detection method, cause the problem of vibration.
Summary of the invention
For adopting the hardware trapping module (CAP) of DSP module and the technical barrier that stagnant ring relative method cannot accurately be judged inductive current direction, the invention provides a kind of software and hardware method that pick-up unit of inductive current zero crossing combines with software detection, realization is phase-locked to inductive current, then judges zero crossing and the direction of inductive current.The present invention has not only overcome the defect of independent employing hardware or software approach, and equipment is simple, and it is convenient to detect, and reliability is high.
The technical solution adopted in the present invention is:
A pick-up unit for inductive current zero crossing, by current sensor, dividing potential drop conditioning module, voltage follow module, on draw biasing module, DSP module, load module and LCD display module to form;
Current sensor is the sensor based on hall principle;
Dividing potential drop conditioning module, the current sampling signal that current sensor sampling is obtained is converted into voltage signal through resistance R 14, R16, and in the low-pass first order filter filtering sampling process consisting of the resistance R 15 in this module and capacitor C 1, the higher hamonic wave of signal obtains ac filter signal;
Voltage follow module, consists of resistance R 17 and operational amplifier U1; Operational amplifier U1 rises and has improved input impedance, and the effect that reduces the output impedance of dividing potential drop conditioning module; Ac filter signal is followed signal through voltage follow module output voltage;
On draw biasing module, by resistance R 18, R19, R20 and capacitor C 2, formed; Wherein, resistance R 18, R20 divide equally after the 3.3V supply voltage that driving voltage provides, the voltage follow signal of voltage follow module output has been converted to and take the direct current signal that 1.65V is intermediate point, after the filtering of the low-pass filter that this direct current signal forms through resistance R 19 and capacitor C 2 again, obtain DC filtering signal, by the ADC sampling module in this DC filtering signal access DSP module, carry out modulus processing subsequently;
DSP module is to adopt TMS320LF28335 chip, utilizes the algorithm routine of its inner ADC sampling module and setting to carry out modulus processing;
Load module and LCD display module, realize good in interactive function, algorithm routine is burned onto to the measuring ability of realizing inductive current zero crossing in DSP module, the data message simultaneously DSP module being carried out after modulus processing according to the setting of algorithm routine is presented at the upper demonstration of LCD;
During use:
First the current sensor of this pick-up unit is connected on to the current output terminal of inductance to be measured, the faint charge signal that current sensor is captured successively through dividing potential drop conditioning module, voltage follow module, on send in the ADC sampling module of DSP module after drawing the signal of biasing module to process; Signal enters after the ADC sampling module of DSP module, adopts phase locked algorithm to lock to obtain the phase angle theta of this inductive current; Subsequently obtained phase angle theta is judged: if phase angle
inductive current is negative sense, inductive current direction flag flag=0; If phase angle
or
inductive current is forward, inductive current direction flag flag=1; Finally, by the built-in GPIO unit of DSP module, the testing result of the direction of inductive current is presented on the LCD of this equipment.
The pick-up unit of described a kind of inductive current zero crossing, the detection algorithm of this pick-up unit is the single-phase phase-locked loop based on second order improper integral device; Current sensor by this pick-up unit is obtained and successively by dividing potential drop conditioning module, voltage follow module, on draw biasing module to process inductive current v by the orthogonal signal generator algorithm construction based on second order improper integral device, go out two-phase orthogonal signal v ' and the qv ' in two-phase rest frame α β, method by two-phase rest frame α β to the coordinate transform of synchronous rotating frame dq, wherein, α, β represent respectively the two-phase under two-phase rest frame, d axle represents real component, q axle represents idle component, extracts the idle component v of q axle
q, then the principle by phaselocked loop makes v
q=0, realization is phase-locked to inductive current.
The pick-up unit of described a kind of inductive current zero crossing, the model of its current sensor is LA58P.
Advantage of the present invention: circuit structure of the present invention is simple, compact, programmed algorithm is succinct, accurate, can not cause time delay or the concussion of signal on inductance to be measured in testing process.
Accompanying drawing explanation:
Fig. 1 is hardware block diagram of the present invention.
Fig. 2 is dividing potential drop conditioning module conditioning figure.
Fig. 3 is voltage follow module conditioning figure.
Fig. 4 draws biasing module conditioning figure on being.
Fig. 5 is algorithm main program flow chart.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Embodiment:
Now in conjunction with Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, hardware configuration of the present invention and method of testing are described.Hardware configuration of the present invention by current sensor, dividing potential drop modulate circuit, voltage follower, on draw biasing module, DSP module, load module and LCD display module to form.
First by this pick-up unit, the LA58P type current sensor based on hall principle is connected on the output terminal of the electric current of inductance to be measured, and the faint charge signal that current sensor LA58P is captured is passed to the dividing potential drop conditioning module of next stage;
Dividing potential drop conditioning module the current signal that receives is converted into voltage signal through resistance R 14, R16 and the low-pass first order filter filtering sampling process that forms by the resistance R 15 in this module and capacitor C 1 in the higher hamonic wave of signal obtain ac filter signal; Then pass to the voltage follow module of next stage;
Voltage follow module, consists of resistance R 17 and operational amplifier U1; This module receives higher level and transmits after next ac filter signal, reduces prime output impedance when improving input impedance; Specifically by operational amplifier U1 in this module, realize and improve input impedance, eliminate late-class circuit and prime current signal is converted to the impact of the change-over circuit of voltage signal, and the output impedance that reduces prime current-to-voltage converting circuit, eliminate the object on the impact of rear class booster circuit; Subsequently signal at the corresponding levels is delivered to next stage on draw biasing module;
On draw biasing module, by resistance R 18, R19, R20 and capacitor C 2, formed; Because the ADC sampling module input of DSP module is the DC quantity between 0～3V, therefore need to use the 3.3V supply voltage of resistance R18, R20 equipartition device driving voltage, the AC signal of voltage follow module output has been converted to and take the direct current signal that 1.65V is intermediate point, after the filtering of the low-pass filter that this direct current signal forms through resistance R 19 and capacitor C 2 again, obtain DC filtering signal, subsequently this DC filtering signal is transferred to the ADC sampling module of DSP module, carry out modulus processing;
DSP module adopts TMS320LF28335 chip, utilizes the algorithm routine of its inner ADC sampling module and setting to carry out modulus processing, is specially: signal is entered after the ADC sampling module of DSP module, adopt phase locked algorithm to lock to obtain the phase angle theta of this inductive current; Subsequently obtained phase angle theta is judged: if phase angle
inductive current is negative sense, inductive current direction flag flag=0; If phase angle
or
inductive current is forward, inductive current direction flag flag=1;
Described phase locked algorithm is the single-phase phase-locked loop technology based on second order improper integral device; First by successively through dividing potential drop conditioning module, voltage follow module, on draw the pretreated inductive current v of biasing module to go out two-phase orthogonal signal v ' and the qv ' in two-phase rest frame α β by the orthogonal signal generator algorithm construction based on second order improper integral device, method by two-phase rest frame α β to the coordinate transform of synchronous rotating frame dq, wherein, α, β represent respectively the two-phase under two-phase rest frame, d axle represents real component, and q axle represents idle component.Extract the idle component v of q axle
q, idle component v then
qby the closed-loop control of direct current signal and the principle of phase lock loop of pi regulator, make v
q=0, obtain angular frequency, by diagonal frequencies ω's
integrator obtains phase angle, then to locking to such an extent that the phase angle remainder of getting 2 π obtains phase angle theta;
Finally, the GPIO unit built-in by DSP module is presented at the testing result of the direction of inductive current on this equipment display terminal, by observing the level number of inductive current zone bit flag, can learn sense of current;
Load module and LCD display module, realize good in interactive function jointly; Comprise: algorithm routine is inputed to the measuring ability of realizing inductive current zero crossing in DSP module, the data message that DSP module is carried out after modulus processing according to the setting of algorithm routine shows.
The zero crossing that the present invention is applicable to the inductive current of any topological structure and modulation system circuit detects.
Claims (3)
1. a pick-up unit for inductive current zero crossing, by current sensor, dividing potential drop conditioning module, voltage follow module, on draw biasing module, DSP module, load module and LCD display module to form;
Current sensor is the sensor based on hall principle;
Dividing potential drop conditioning module, the current sampling signal that current sensor sampling is obtained is converted into voltage signal through resistance R 14, R16, and in the low-pass first order filter filtering sampling process consisting of the resistance R 15 in this dividing potential drop conditioning module and capacitor C 1, the higher hamonic wave of signal obtains ac filter signal;
Voltage follow module, consists of resistance R 17 and operational amplifier U1; Operational amplifier U1 rises and has improved input impedance, and the effect that reduces the output impedance of dividing potential drop conditioning module; Ac filter signal is followed signal through voltage follow module output voltage;
On draw biasing module, by resistance R 18, R19, R20 and capacitor C 2, formed; Wherein, resistance R 18, R20 divide equally after the 3.3V supply voltage that driving voltage provides, the voltage follow signal of voltage follow module output has been converted to and take the direct current signal that 1.65V is intermediate point, after the filtering of the low-pass filter that this direct current signal forms through resistance R 19 and capacitor C 2 again, obtain DC filtering signal, by the ADC sampling module in this DC filtering signal access DSP module, carry out modulus processing subsequently;
DSP module is to adopt TMS320LF28335 chip, utilizes the algorithm routine of its inner ADC sampling module and setting to carry out modulus processing;
Load module and LCD display module, realize good in interactive function, algorithm routine is burned onto to the measuring ability of realizing inductive current zero crossing in DSP module, the data message simultaneously DSP module being carried out after modulus processing according to the setting of algorithm routine is presented on LCD display module;
During use:
First the current sensor of this pick-up unit is connected on to the current output terminal of inductance to be measured, the faint charge signal that current sensor is captured successively through dividing potential drop conditioning module, voltage follow module, on send in the ADC sampling module of DSP module after drawing the signal of biasing module to process; Signal enters after the ADC sampling module of DSP module, adopts phase locked algorithm to lock to obtain the phase angle theta of this inductive current; Subsequently obtained phase angle theta is judged: if phase angle
inductive current is negative sense, inductive current direction flag flag=0; If phase angle
or
inductive current is forward, inductive current direction flag flag=1; Finally, by the built-in GPIO unit of DSP module, the testing result of the direction of inductive current is presented on LCD display module.
2. the pick-up unit of a kind of inductive current zero crossing according to claim 1, is characterized in that, the detection algorithm of this pick-up unit is the single-phase phase-locked loop based on second order improper integral device; Current sensor by this pick-up unit is obtained and successively by dividing potential drop conditioning module, voltage follow module, on draw biasing module to process inductive current v by the orthogonal signal generator algorithm construction based on second order improper integral device, go out two-phase orthogonal signal v ' and the qv ' in two-phase rest frame α β, method by two-phase rest frame α β to the coordinate transform of synchronous rotating frame dq, wherein, α, β represent respectively the two-phase under two-phase rest frame, d axle represents real component, q axle represents idle component, extracts the idle component v of q axle
q, then the principle by phaselocked loop makes v
q=0, realization is phase-locked to inductive current.
3. the pick-up unit of a kind of inductive current zero crossing according to claim 1, is characterized in that: the model of described current sensor is LA58P.
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| CN103412181B (en) * | 2013-09-02 | 2015-09-16 | 南京埃科孚电子科技有限公司 | For the inductive current zero cross detection circuit that boost power factor corrects |
| CN104808058B (en) * | 2014-01-26 | 2017-12-12 | 南京邮电大学 | A kind of measuring method of electric signal instantaneous phase |
| CN103956794B (en) * | 2014-05-12 | 2016-05-18 | 博耳(无锡)电力成套有限公司 | charging pile circuit control device |
| CN104578857B (en) * | 2015-01-12 | 2017-07-28 | 阳光电源股份有限公司 | Control method, control device and the photovoltaic generating system of photovoltaic generating system |
| CN105842527B (en) * | 2016-06-08 | 2018-10-16 | 江苏现代电力科技股份有限公司 | Anti-interference high-precision zero crossing detection device |
| WO2018146767A1 (en) * | 2017-02-09 | 2018-08-16 | 理化工業株式会社 | Zero-crossing detection device |
| CN106997003A (en) * | 2017-06-09 | 2017-08-01 | 郑州云海信息技术有限公司 | It is a kind of to realize the lossless system for exempting to tear measurement open of server power supply electric current |
| CN109782581B (en) * | 2018-12-07 | 2022-03-22 | 广东核电合营有限公司 | Proportional-integral regulating circuit and electric equipment |
| CN109917170B (en) * | 2019-04-04 | 2020-03-10 | 西南交通大学 | Method for detecting dq current of single-phase pulse rectifier without phase-locked loop |
| CN111521862A (en) * | 2020-06-01 | 2020-08-11 | 浙江嘉宏电力科技有限公司 | Accurate-calibration type zero-crossing detection method |
| CN113671244A (en) * | 2021-08-06 | 2021-11-19 | 优利德科技(中国)股份有限公司 | Amplification module, detection sampling device and signal sampling amplification method |
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