CN102253274B - Current detection method and device - Google Patents
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Abstract
The invention relates to a current detection method and device. The method comprises the following steps: A. respectively calculating the time tn corresponding to each syn-position analog to digital (AD) sampling of M syn-position analog to digital (AD) converters by taking a rising edge of enforced pulse width modulation (EPWM) of a drive switching tube as zero hour; B. determining the minimum value of high-level duration of an EPWM signal, and a syn-position value of the AD converter corresponding to the sampling time of the switching tube when the high-level duration of the EPWM signal is the minimum value according to the time corresponding to each syn-position AD sampling of the AD converter, the turn-on delay time of the switching tube and the turn-off delay time of the switching tube; and C. arranging the sampling of the current of the switching tube to the corresponding syn-position value when the high-level duration of the EPWM signal is the minimum value. By utilizing the technical scheme implementing the invention, the condition that the current flowing through the switching tube can be accurately detected is ensured on the premise that the high-level duration of the EPWM signal of the drive switching tube is limited to be shortest.
Description
Technical field
The present invention relates to Power Electronic Technique, more particularly, relate to a kind of electric current detecting method and device.
Background technology
The device that detects at present electric current in the industry generally adopts current transformer, shunting to take into account hall device, and the cost with HF current transformer is the cheapest again in these devices.
Fig. 1 is the circuit theory diagrams of the rectifier of UPS (Uninterruptible Power Supply, uninterrupted power source), and Fig. 2 is current sampling circuit figure, and Fig. 3 is the amplification circuit diagram of sample rate current; In conjunction with Fig. 1, Fig. 2 and Fig. 3, in the design of the rectifier of middle low power UPS, usually adopt HF current transformer CT1, CT2 to come the electric current of detector switch pipe Q1, Q2 respectively, wherein switching tube Q1, Q2 are driven by EPWM (Enhanced Pulse Width Modulator, the pulse-width modulator of enhancing) signal respectively.
Be that example describes with the current transformer CT1 of detector switch pipe Q1 electric current only below, the both sides, former limit of current transformer CT1 are connected in the branch road at switching tube Q1 place, connect resistance R 202 between the PFC_P_CT+ end of current transformer CT1 secondary and the PFC_P_CT-end, realize that switching tube Q1 closes the magnetic reset of the current transformer CT1 that has no progeny, thereby realize the release of the secondary energy of current transformer CT1.The positive pole of diode D112 connects the PFC_P_CT+ end, and its negative pole connects the PFC_P_I+ end, and resistance R 203 and resistance R 204 are connected in parallel on respectively between two input ends (being PFC_P_I+ end and PFC_P_I-end) of the amplifying circuit of sample rate current.Resistance R 203 and resistance R 204 realize that the sample rate current signal is to the conversion of voltage signal.Voltage signal after the conversion exports the AD converter (not shown) to by the PFC_P_I end after operational amplifier U19 amplifies, pass through software control algorithm then, with input current as input PFC (PowerFactor Correction, power factor correction) regulation and control object of Jiao Zhenging, so the accuracy of the current sampling data of switching tube directly influences the realization of stability and every performance index of system.
In the process of the above-mentioned current detecting of practical application, find that there are two drawbacks in this circuit: one, switching tube service time is too short, the high level lasting time that is the EPWM signal is too short, can cause accurately sample rate current signal, in addition occur adopting less than situation; Two, switching tube open delay time and the length of turn off delay time time, also can influence the accuracy of sample rate current signal.Describe in conjunction with Fig. 4, wherein, x is the high level lasting time of EPWM signal, y is the delay time of opening of described switching tube, d is the turn off delay time time of described switching tube, if the high level lasting time of EPWM signal, switching tube open delay time and the coupling of turn off delay time time is unreasonable, can make the sampling instant of switching tube electric current depart from " optimum sampling district ", then can cause accurately sample rate current signal, even occur adopting less than current data, so the above three time factor all can influence the accuracy of sample rate current signal.
Summary of the invention
The technical problem to be solved in the present invention is that the inaccurate defective of above-mentioned current detecting at prior art provides a kind of electric current detecting method and device, can detect the electric current of the switching tube that flows through the UPS rectifier exactly.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of electric current detecting method, the electric current for detection of flowing through switching tube comprises:
A. serve as zero constantly with the rising edge of the EPWM signal of driving switch pipe, calculate each cis-position AD sampling moment corresponding t of M cis-position AD converter respectively
n, n=1,2 ..., M;
B. determine the minimum value of the high level lasting time of EPWM signal according to each cis-position AD sampling moment corresponding of AD converter, the turn off delay time time of opening delay time and described switching tube of described switching tube, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value;
The cis-position value of the corresponding AD converter of sampling instant of switching tube electric current when C. placing the high level lasting time of described EPWM signal to be minimum value the sampling of switching tube electric current.
In electric current detecting method of the present invention, in step B, determine the minimum value of the high level lasting time of EPWM signal according to following constraint condition, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value:
Wherein, x is the high level lasting time of EPWM signal, and y is the delay time of opening of described switching tube, and d is the turn off delay time time of described switching tube.
In electric current detecting method of the present invention,
The delay time of opening of described switching tube comprises: opening of driving time-delay, switching tube self delayed time and the current sampling circuit time-delay;
The turn off delay time time of described switching tube comprises: drive turn off delay time and the current sampling circuit time-delay of time-delay, switching tube self.
In electric current detecting method of the present invention, in steps A,
The AD converter first cis-position AD sampling instant is:
t
1＝t
c+2.5·t
c+(1+S)·t
c
Wherein, t
cBe the sampling clock cycle of AD converter, S is the number of sampling time window;
AD converter second cis-position to the M cis-position AD sampling instant is:
t
i＝t
i-1+(1+1+S)·t
c
Wherein, i=2,3 ..., M.
The present invention also constructs a kind of current sensing means, and the electric current for detection of flowing through switching tube comprises:
Computing unit is used for rising edge with the EPWM signal of driving switch pipe and serves as zero constantly, calculates each cis-position AD sampling moment corresponding t of M cis-position AD converter respectively
n, n=1,2 ..., M;
Determining unit, be used for each the cis-position AD sampling moment corresponding according to AD converter, the turn off delay time time of opening delay time and described switching tube of described switching tube and determine the minimum value of the high level lasting time of EPWM signal, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value;
Dispensing unit, the cis-position value of the corresponding AD converter of sampling instant of switching tube electric current when placing the high level lasting time of EPWM signal to be minimum value for the sampling with the switching tube electric current.
In current sensing means of the present invention, in determining unit, determine the minimum value of the high level lasting time of EPWM signal according to following constraint condition, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value:
Wherein, x is the high level lasting time of EPWM signal, and y is the delay time of opening of described switching tube, and d is the turn off delay time time of described switching tube.
In current sensing means of the present invention, the delay time of opening of described switching tube comprises: opening of driving time-delay, switching tube self delayed time and the current sampling circuit time-delay;
The turn off delay time time of described switching tube comprises: drive turn off delay time and the current sampling circuit time-delay of time-delay, switching tube self.
In current sensing means of the present invention, in computing unit, the AD converter first cis-position AD sampling instant is:
t
1＝t
c+2.5·t
c+(1+S)·t
c
Wherein, t
cBe the sampling clock cycle of AD converter, S is the number of sampling time window;
AD converter second cis-position to the M cis-position AD sampling instant is:
t
i＝t
i-1+(1+1+S)·t
c
Wherein, i=2,3 ..., M.
Implement electric current detecting method of the present invention and device, under to the shortest prerequisite of the high level lasting time restriction of the EPWM signal of driving switch pipe, guaranteed to detect the electric current that flows through switching tube exactly.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the circuit theory diagrams of rectifier of the UPS of prior art;
Fig. 2 is the current sampling circuit figure of prior art;
Fig. 3 is the amplification circuit diagram of the sample rate current of prior art;
Fig. 4 is the sequential chart that EPWM output drive signal, actual switch pipe drive signal and AD mouth sample rate current signal;
Fig. 5 is the process flow diagram of electric current detecting method first embodiment of the present invention;
Fig. 6 is the process flow diagram of current sensing means first embodiment of the present invention.
Embodiment
As shown in Figure 5, in electric current detecting method first embodiment of the present invention, what at first should be noted that switching tube opens or turn-offs the signal controlling by EPWM, and when namely the EPWM signal was high level, switching tube was open-minded, and when the EPWM signal was low level, switching tube turn-offed.In the service time of switching tube, the electric current that flows through switching tube is sampled, changed and amplifies to circuit shown in Figure 3 by Fig. 1, and send into AD converter.For accurately sampling the electric current that flows through switching tube, the sampling instant of switching tube electric current is positioned at " optimum sampling district ", just, make the sampling instant of the cis-position corresponding with the switching tube current sample of AD converter be positioned at " optimum sampling district ".For the AD converter of determining, the sampling instant of its each cis-position determines, so, make sampling instant be positioned at " optimum sampling district ", should find the suitable time of switching tube conducting and the cis-position value of corresponding AD converter thereof, guarantee that again this ON time is the shortest.Owing to the time-delay that turned on and off of switching tube, so will find the suitable time of switching tube conducting, will determine the high level lasting time of the EPWM signal of gauge tap pipe conducting earlier again.So this electric current detecting method may further comprise the steps:
Step S101. serves as zero constantly with the rising edge of the EPWM signal of driving switch pipe, each the cis-position AD that calculates M cis-position AD converter respectively corresponding moment t that samples
n, n=1,2 ..., M; In this step, each cis-position AD that can calculate AD converter according to the datasheet of the selected chip of AD converter samples the corresponding moment, and for example, selecting chip in one embodiment is the F2806 of TI, and the AD clock period that this chip is set is t
c, the number of sampling time window is S, then the corresponding sampling instant of 16 of this chip AD sampling cis-positions is respectively:
The first cis-position AD corresponding moment of sampling is:
t
1=t
c+ 2.5t
c+ (1+S) t
cFormula 1
Wherein, first addend t
cFor triggering the time delays of AD sampling;
Second addend 2.5t
cSample and really begin the time delays of sampling for triggering AD;
The 3rd addend (1+S) t
cTime delays for the sampling maintenance;
The second cis-position AD corresponding moment of sampling is:
t
2=t
1+ (1+1+S) t
cFormula 2
Wherein, (1+1+S) t
cCompare (1+S) t in the formula 1
c, also need add previous cis-position and sample data-switching time of an employed clock period, so, on the basis of 1+S, add 1 again in the formula 2.
Similarly, the 3rd cis-position AD corresponding moment of sampling is:
t
3＝t
2+(1+1+S)·t
c
The 4th cis-position AD corresponding moment of sampling is:
t
4＝t
3+(1+1+S)·t
c
Similarly, the AD of following cis-position sample the corresponding moment please refer to second and third, four cis-position AD sample the corresponding moment, do not do at this and give unnecessary details.
In one embodiment, if the sampling clock frequency of AD converter is 12.5MHZ, its sampling clock cycle t then
cBe 0.08us, and the number S that sets the sampling time window is 5, then preceding 8 cis-position AD of this chip corresponding moment of sampling is respectively:
The first cis-position AD corresponding moment t that samples
1=0.76us;
The second cis-position AD corresponding moment t that samples
2=1.32us;
The 3rd cis-position AD corresponding moment t that samples
3=1.88us;
The 4th cis-position AD corresponding moment t that samples
4=2.44us;
The 5th cis-position AD corresponding moment t that samples
5=3.00us;
The 6th cis-position AD corresponding moment t that samples
6=3.56us;
The 7th cis-position AD corresponding moment t that samples
7=4.12us;
The 8th cis-position AD corresponding moment t that samples
8=4.68us;
Should be noted that back 8 cis-position AD corresponding moment of sampling also needs to calculate, its method is the same with preceding 8 cis-positions, in this omission.
The cis-position value of the corresponding AD converter of sampling instant of switching tube electric current when step S102. determines according to the turn off delay time time of opening delay time and described switching tube of each cis-position AD sampling moment corresponding of AD converter, described switching tube that the high level lasting time of the minimum value of high level lasting time of EPWM signal and EPWM signal is minimum value; In this step, preferably, determine the minimum value of the high level lasting time of EPWM signal according to following constraint condition, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value:
Wherein, x is the high level lasting time of EPWM signal, and y is the delay time of opening of described switching tube, and d is the turn off delay time time of described switching tube.
When the switching tube current sample was configured to different AD sampling cis-positions, according to above constraint condition, the high level lasting time of the EPWM signal that calculates was inevitable different, wherein certainly exists the minimum value of x.In the above-described embodiments, as shown in Figure 4, if survey to such an extent that the delay time of opening of switching tube is about 1.26us, the turn off delay time time of switching tube is about 1.44us, then respectively with preceding 8 of AD converter (back 8 also need substitution, in the present embodiment only before 8 describe for example) the corresponding moment t of cis-position
1, t
2, t
3, t
4, t
5, t
6, t
7, t
8The above constraint condition of substitution, and by calculating each current sample t constantly
iCorresponding x
i(i=1,2 ..., 8) minimum value be respectively:
The switching tube current sample is t constantly
1The time, the high level lasting time x of EPWM signal
1〉=1.00us, and then as can be known, x
1Minimum value be 1.00us;
The switching tube current sample is t constantly
2The time, the high level lasting time x of EPWM signal
2〉=-0.12us, and then as can be known, x
2Minimum value be that (should be noted that because the high level lasting time of the EPWM signal of actual driving switch pipe greater than 0, that is to say, be t at the switching tube current sample to 0us constantly
2The time, high level lasting time is that the EPWM signal of any value all is fit to, so, the high level lasting time x of EPWM signal
2Minimum value be 0us);
The switching tube current sample is t constantly
3The time, the high level lasting time x of EPWM signal
3〉=0.88us, and then as can be known, x
3Minimum value be 0.88us;
The switching tube current sample is t constantly
4The time, the high level lasting time x of EPWM signal
4〉=2.00us, and then as can be known, x
4Minimum value be 2.00us;
The switching tube current sample is t constantly
5The time, the high level lasting time x of EPWM signal
5〉=3.12us, and then as can be known, x
5Minimum value be 3.12us;
The switching tube current sample is t constantly
6The time, the high level lasting time x of EPWM signal
6〉=4.24us, and then as can be known, x
6Minimum value be 4.24us;
The switching tube current sample is t constantly
7The time, the high level lasting time x of EPWM signal
7〉=5.36us, and then as can be known, x
7Minimum value be 5.36us;
The switching tube current sample is t constantly
8The time, the high level lasting time x of EPWM signal
8〉=6.48us, and then as can be known, x
8Minimum value be 6.48us.
In the above-described embodiments, need detect the electric current of switching tube Q1, Q2 among Fig. 1 simultaneously, then the minimum value of the high level lasting time x of EPWM signal should be above-mentioned x
1～x
8Minimum value in the greater in minimum two.Obviously, in this embodiment, x
1～x
8Minimum value in minimum two be respectively x
2(0us) and x
3(0.88us), obviously, its greater is 0.88us, so the minimum value of x is 0.88us.At this moment, the current sample of two switching tube Q1, Q2 is respectively t2 and the t3 moment constantly, and the cis-position value of corresponding AD converter is respectively second cis-position and the 3rd cis-position.
Corresponding cis-position value when step S103. places the high level lasting time of EPWM signal to be minimum value the sampling of switching tube electric current.In the above-described embodiments, be specially: the current sample passage of switching tube Q1 among Fig. 1 is configured to second cis-position of AD converter, the current sample passage of switching tube Q2 among Fig. 1 is configured to the 3rd cis-position of AD converter.
The described method of present embodiment, owing to adopt above-described constraint condition, be positioned at " optimum sampling district " constantly so both guaranteed the current sample of switching tube, and then can detect the electric current that flows through switching tube exactly, the high level lasting time with the EPWM signal of driving switch pipe is restricted to the shortest again.
As shown in Figure 6, in current sensing means first embodiment of the present invention, this pick-up unit comprises computing unit 100, determining unit 200 and dispensing unit 300, wherein, the rising edge that computing unit 100 is used for the EPWM signal of driving switch pipe was zero moment, calculated each cis-position AD sampling moment corresponding t of M cis-position AD converter respectively
n, n=1,2 ..., M; Determining unit 200 is used for each the cis-position AD sampling moment corresponding according to AD converter, the turn off delay time time of opening delay time and described switching tube of described switching tube and determines the minimum value of the high level lasting time of EPWM signal, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value; Corresponding cis-position value when dispensing unit 300 places the high level lasting time of EPWM signal to be minimum value for the sampling with the switching tube electric current.
Preferably, in determining unit 200, determine the minimum value of the high level lasting time of EPWM signal according to following constraint condition, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value:
Wherein, x is the high level lasting time of EPWM signal, y is the delay time of opening of described switching tube, and d is the turn off delay time time of described switching tube, and the delay time y that opens of switching tube comprises that opening of driving time-delay, switching tube self delayed time and the current sampling circuit time-delay; The turn off delay time time d of switching tube comprises: drive turn off delay time and the current sampling circuit time-delay of time-delay, switching tube self.
Preferably, in computing unit 100, the AD converter first cis-position AD sampling instant is:
t
1＝t
c+2.5·t
c+(1+S)·t
c
Wherein, t
cBe the sampling clock cycle of AD converter, S is the number of sampling time window;
AD converter second cis-position to the M cis-position AD sampling instant is:
t
i＝t
i-1+(1+1+S)·t
c
Wherein, i=2,3 ..., M.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (8)
1. electric current detecting method, the electric current for detection of flowing through switching tube is characterized in that, comprising:
A. serve as zero constantly with the rising edge of the EPWM signal of driving switch pipe, calculate each cis-position AD sampling moment corresponding t of M cis-position AD converter respectively
n, n=1,2 ..., M;
B. determine the minimum value of the high level lasting time of EPWM signal according to each cis-position AD sampling moment corresponding of AD converter, the turn off delay time time of opening delay time and described switching tube of described switching tube, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value;
The cis-position value of the corresponding AD converter of sampling instant of switching tube electric current when C. placing the high level lasting time of described EPWM signal to be minimum value the sampling of switching tube electric current.
2. electric current detecting method according to claim 1, it is characterized in that, in step B, determine the minimum value of the high level lasting time of EPWM signal according to following constraint condition, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value:
Wherein, x is the high level lasting time of EPWM signal, and y is the delay time of opening of described switching tube, and d is the turn off delay time time of described switching tube.
3. electric current detecting method according to claim 1 is characterized in that,
The delay time of opening of described switching tube comprises: opening of driving time-delay, switching tube self delayed time and the current sampling circuit time-delay;
The turn off delay time time of described switching tube comprises: drive turn off delay time and the current sampling circuit time-delay of time-delay, switching tube self.
4. electric current detecting method according to claim 1 is characterized in that, in steps A,
The AD converter first cis-position AD sampling instant is:
t
1＝t
c+2.5·t
c+(1+S)·t
c
Wherein, t
cBe the sampling clock cycle of AD converter, S is the number of sampling time window;
AD converter second cis-position to the M cis-position AD sampling instant is:
t
i＝t
i-1+(1+1+S)·t
c
Wherein, i=2,3 ..., M.
5. current sensing means, the electric current for detection of flowing through switching tube is characterized in that, comprising:
Computing unit is used for rising edge with the EPWM signal of driving switch pipe and serves as zero constantly, calculates each cis-position AD sampling moment corresponding t of M cis-position AD converter respectively
n, n=1,2 ..., M;
Determining unit, be used for each the cis-position AD sampling moment corresponding according to AD converter, the turn off delay time time of opening delay time and described switching tube of described switching tube and determine the minimum value of the high level lasting time of EPWM signal, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value;
Dispensing unit, the cis-position value of the corresponding AD converter of sampling instant of switching tube electric current when placing the high level lasting time of EPWM signal to be minimum value for the sampling with the switching tube electric current.
6. current sensing means according to claim 5, it is characterized in that, in determining unit, determine the minimum value of the high level lasting time of EPWM signal according to following constraint condition, and the cis-position value of the high level lasting time of EPWM signal corresponding AD converter of sampling instant of switching tube electric current when being minimum value:
Wherein, x is the high level lasting time of EPWM signal, and y is the delay time of opening of described switching tube, and d is the turn off delay time time of described switching tube.
7. current sensing means according to claim 5 is characterized in that, the delay time of opening of described switching tube comprises: opening of driving time-delay, switching tube self delayed time and the current sampling circuit time-delay;
The turn off delay time time of described switching tube comprises: drive turn off delay time and the current sampling circuit time-delay of time-delay, switching tube self.
8. current sensing means according to claim 5 is characterized in that, in computing unit, the AD converter first cis-position AD sampling instant is:
t
1＝t
c+2.5·t
c+(1+S)·t
c
Wherein, t
cBe the sampling clock cycle of AD converter, S is the number of sampling time window;
AD converter second cis-position to the M cis-position AD sampling instant is:
t
i＝t
i-1+(1+1+S)·t
c
Wherein, i=2,3 ..., M.
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|---|---|---|---|---|
| CN101330224A (en) * | 2003-08-15 | 2008-12-24 | 美国能量变换公司 | Uninterruptible power supply |
| CN101436939A (en) * | 2007-11-13 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Sensing apparatus for AC power supply |
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| JPH08251839A (en) * | 1995-03-15 | 1996-09-27 | Kikusui Electron Corp | Uninterruptible power supply device and method of power harmonic current restraint thereof |
| US6735537B2 (en) * | 2002-03-15 | 2004-05-11 | Motorola, Inc. | Procedure for measuring the current in each phase of a three-phase device via single current sensor |
| JP4421515B2 (en) * | 2005-06-06 | 2010-02-24 | 株式会社Ｎｔｔファシリティーズ | DC uninterruptible power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101330224A (en) * | 2003-08-15 | 2008-12-24 | 美国能量变换公司 | Uninterruptible power supply |
| CN101436939A (en) * | 2007-11-13 | 2009-05-20 | 鸿富锦精密工业（深圳）有限公司 | Sensing apparatus for AC power supply |
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| JP特开2006-340564A 2006.12.14 |
| JP特开平8-251839A 1996.09.27 |
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