CN103076482A - Motor current detection device and motor current detection method - Google Patents
Motor current detection device and motor current detection method Download PDFInfo
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- CN103076482A CN103076482A CN2012102242970A CN201210224297A CN103076482A CN 103076482 A CN103076482 A CN 103076482A CN 2012102242970 A CN2012102242970 A CN 2012102242970A CN 201210224297 A CN201210224297 A CN 201210224297A CN 103076482 A CN103076482 A CN 103076482A
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Abstract
The invention relates to a motor current detection device adopting bridge arm resistances and a motor current detection method. According to the method, sampling resistances are respectively connected in series between respective emitting electrodes of insulated gate bipolar translators (IGBT) respectively on respective lower bridge arms of three bridge arms of a frequency converter mutually connected with a motor and DCNs, wherein DCN refers to a negative electrode of direct-current bus voltage; a voltage drop on each resistance is transmitted to a next circuit for calculating current after being amplified, and therefore, the drain current of the IGBT of each lower bridge arm is detected. After the current flowing through each bridge arms is sampled, the three-phase current of the motor is calculated through a software algorithm. Compared with a traditional common motor current sampling mode, a sampling mode of the motor current detection method is simple and convenient and is high in precision. Moreover, a sampling circuit is simple in power supply and high in reliability, and thus, even if when motor current is not balanced, a response also can be rapidly made.
Description
Technical field
The present invention relates to motor current detection device and current of electric detection method.
Background technology
Existing current of electric detects (sampling) mode: employing CT(current sensor) or in the output phase line be connected in series sampling resistor, to the biphase current Direct Sampling of motor.
Existing current of electric sample mode need to be to the power supply that suspends of CT and sampling A/D chip, but the power supply of the power supply that is used for suspending is for being used for driving the charge pump boostrap circuit of upper brachium pontis switching tube gate pole, and the impact that integrated circuit is produced has:
(1) power of increase boostrap circuit, and when carrier frequency was low, the voltage fluctuation of boostrap circuit was larger;
(2) boostrap circuit only just has voltage when lower pipe switch, and therefore when frequency converter stopped, current sampling circuit can't be worked;
(3) when frequency converter restarts work, the boostrap circuit Voltage Establishment need to be about the time of 20us, during this period of time in, therefore current sampling circuit is not worked, uncontrollable electric current.
Also have, what existing current of electric sample mode adopted is directly biphase current to be sampled, and therefore when three-phase current unbalance, system can't detect.
Summary of the invention
The present invention proposes in view of the above problems, purpose is, a kind of motor current detection device and current of electric detection method are provided, utilize arm resistance (Leg shunt resistance) as sampling resistor, the current sample mode is easy, precision is high, and the sample circuit power supply mode is simple, reliability is high, and when current of electric is uneven, can respond rapidly.
To achieve these goals, the invention provides a kind of motor current detection device, each phase current for detection of motor, comprise: frequency converter, its each brachium pontis is connected with each phase line of said motor respectively, with regard to arbitrary brachium pontis in above-mentioned each brachium pontis, this brachium pontis is divided into top brachium pontis and bottom brachium pontis by the connected node that is connected with the phase line of said motor, above-mentioned top brachium pontis is connected with the positive pole of DC bus-bar voltage, above-mentioned bottom brachium pontis is connected with the negative pole of DC bus-bar voltage, be respectively equipped with on-off element for this brachium pontis of on/off at above-mentioned top brachium pontis and bottom brachium pontis, and each on-off element on above-mentioned each brachium pontis consists of PWM on-off element sequence; A plurality of sampling resistors are located at respectively on the bottom brachium pontis of each brachium pontis of above-mentioned frequency converter; Pick-up unit for detection of the electric current of the bottom brachium pontis of above-mentioned each brachium pontis that flows through above-mentioned frequency converter, calculates each phase current of said motor according to detected above-mentioned electric current.
In addition, the present invention also provides a kind of current of electric detection method, each phase current for detection of the motor that is connected with frequency converter, each brachium pontis of above-mentioned frequency converter is connected with each phase line of said motor respectively, with regard to the arbitrary brachium pontis in above-mentioned each brachium pontis, this brachium pontis is divided into top brachium pontis and bottom brachium pontis by the connected node that is connected with the phase line of said motor, above-mentioned top brachium pontis is connected with the positive pole of DC bus-bar voltage, above-mentioned bottom brachium pontis is connected with the negative pole of DC bus-bar voltage, be respectively equipped with on-off element for this brachium pontis of on/off at above-mentioned top brachium pontis and bottom brachium pontis, and, each on-off element on above-mentioned each brachium pontis consists of PWM on-off element sequence, bottom brachium pontis at each brachium pontis of above-mentioned frequency converter is respectively equipped with sampling resistor, the said motor electric current detecting method comprises: detecting step, according to the on/off state of said PWM on-off element sequence, detect the electric current of the bottom brachium pontis of above-mentioned each brachium pontis that flows through above-mentioned frequency converter; Calculation procedure according to detected above-mentioned electric current, is calculated each phase current of said motor.
In the current of electric detection method of above-mentioned employing arm resistance, three brachium pontis for frequency converter, respectively at the IGBT(insulated gate bipolar triode on the brachium pontis of the bottom of each brachium pontis) emitter and node DCN between be connected in series sampling resistor (arm resistance), to send the next stage circuit of crossing the electric current of this bottom brachium pontis for Flow to after the amplification of the pressure drop on this sampling resistor, detect thus the drain current of the IGBT of bottom brachium pontis, and by software algorithm, according to adopt like that as mentioned above the electric current that flows through respectively three brachium pontis calculate the three-phase current of motor.
The present invention utilizes arm resistance that the electric current that flows through respectively brachium pontis is detected (sampling), and power simple and reliable property of sample circuit is high, and it is also high to detect degree of accuracy.
If adopt current of electric sample mode of the present invention, then when the three-phase current unbalance of motor, system can detect and respond rapidly.
Description of drawings
Fig. 1 shows the figure of the circuit topology of motor current detection device of the present invention.
Fig. 2 is the figure be used to the circuit topology that the employed current of electric detection method of motor current detection device of the present invention is described.
Fig. 3 shows the figure of the space vector of voltage of the motor when the present invention relates to use three phase converter.
Fig. 4 shows the figure of the situation of space vector of voltage when the first sector.
Embodiment
Below, with reference to accompanying drawing, motor current detection device and the current of electric detection method of specific embodiments of the invention is elaborated.In the accompanying drawings, node (Node) DCP and DCN are that wherein, DCP is the positive pole of DC bus-bar voltage with two nodes of the DC bus-bar voltage after the three-phase industrial power rectifying and wave-filtering, and DCN is the negative pole of DC bus-bar voltage.
Fig. 1 is the figure that utilizes the circuit topology of the motor current detection device that arm resistance carries out the current of electric detection method of the present invention.As shown in Figure 1, by connected node P1, P2, the P3 on three brachium pontis of three phase converter UI, three phase lines of three phase alternating current motor M are connected with the first brachium pontis B1, the second brachium pontis B2, the 3rd brachium pontis B3 of three phase converter UI respectively, and above-mentioned connected node P1, P2, P3 are divided into respectively top brachium pontis b1, b2, b3 and bottom brachium pontis b1 ', b2 ', b3 ' with above-mentioned the first brachium pontis B1, the second brachium pontis B2, the 3rd brachium pontis B3.Top brachium pontis b1 is provided with on-off element VT1; Bottom brachium pontis b1 ' is provided with on-off element VT4 and sampling resistor R1; Establish on-off element VT3 on the brachium pontis b2 of top; Bottom brachium pontis b2 ' is provided with on-off element VT6 and sampling resistor R2; Top brachium pontis b3 is provided with on-off element VT5; Bottom brachium pontis b3 ' is provided with on-off element VT2 and sampling resistor R3, thus by consisting of PWM(pulse-length modulation for the top brachium pontis of each brachium pontis of on/off and the above-mentioned on-off element VT1～VT6 of bottom brachium pontis) on-off element sequence (switch train).And the top brachium pontis of above-mentioned each brachium pontis is connected with node DCP, and the bottom brachium pontis of above-mentioned each brachium pontis is connected with node DCN.Above-mentioned sampling resistor (arm resistance) R1～R2 is separately positioned on the bottom brachium pontis of each brachium pontis.
And on-off element VT1～VT6 is made of triode (transistor) circuit and diode (Diode) respectively, and this transistor circuit and diode are not particularly limited, and only show in the accompanying drawings the example that is made of the IGBT that comprises NPN type triode.At this moment, sampling resistor R1 ~ R3 is connected in series in respectively between the emitter and node DCN of the IGBT on the bottom brachium pontis that is arranged on each brachium pontis.
Detect in (sampling) method at current of electric of the present invention, the electric current of each brachium pontis in three brachium pontis that flow through respectively frequency converter is sampled, and calculate the three-phase current of motor by the known methods such as algorithm of utilizing software.Compare with existing common current sample mode, not only sample mode is easy in the present invention, degree of accuracy is high, and simple to the power supply of sample circuit, reliability is high, even and when current of electric is uneven, also can respond rapidly.
Fig. 2 is be used to the circuit topology that utilizes the current of electric detection method of motor current detection device of the present invention being described, wherein, simply illustrating on-off element VT1～VT6.As shown in Figure 2, when the drain current of the IGBT that has at the bottom brachium pontis to each brachium pontis on the three-phase inversion frequency changer circuit detects, at the IGBT(on-off element on the brachium pontis of the bottom of each brachium pontis) emitter and node DCN between be connected in series respectively sampling resistor (arm resistance) R1～R3, and connect respectively integrated operational amplifier (integrated operational amplifier) A～C at the two ends of each sampling resistor, utilize integrated operational amplifier A ~ C to detect the voltage (pressure drop) of sampling resistor R1～R3, send to for the next stage circuit that calculates electric current after then each ohmically voltage drop value being amplified.
Above-mentioned sampling resistor, its resistance value size are to determine with the size that flows through the electric current of this brachium pontis according to the output voltage range of sample circuit.If consider the power attenuation on the sampling resistor, then when selecting resistance, preferably aspect power, leave surplus.The voltage of sampling resistor can be illustrated by following formula.And in order to guarantee the accuracy of current sample, noninductive resistance is used in preferred sampling.
U=I*R+L*di/dt(formula 1)
Wherein, U is the voltage at sampling resistor two ends, and I is the electric current that flows through sampling resistor, and L is the stray inductance of sampling resistor, and di/dt is the differential of electric current for the time.
After the electric current of three brachium pontis is flow through respectively in sampling, calculate the three-phase current of motor by software algorithm.
In frequency converter of the present invention, control the action of PWM on-off element sequence by the vector width modulation (PWM) that utilizes space vector, control thus the speed of three phase alternating current motor M.Because realizing above-mentioned control by prior art, so carry out simple explanation at this.
Usually, with the PWM on-off element sequence of the three phase converter among Fig. 1 and Fig. 2, with the some connections (ON) in two on-off elements on each brachium pontis then the mode of another disconnection (OFF) control.Therefore, when the global switch state of expression PWM on-off element sequence, usually be shown as the 1 or 0 global switch state that represents PWM on-off element sequence by the state with upper switches element VT1, VT3, VT5.At this moment, 1 expression switch connection and state when switching on, the state that 0 expression switch disconnects.
When controlling by the way, the PWM on-off element sequence of frequency converter is in any one state in 6 kinds of on off states corresponding with the combination of the on/off (ON/OFF) of each on-off element VT1～VT.The PWM mode refers to, by not shown DSP(Digital SignalProcesser: digital signal processor) become next life 6 corresponding with above-mentioned 6 on off states respectively basic voltage vectors to generate pwm signal, and utilize pwm signal to control the mode of this control PWM on-off element sequence.
The space vector of voltage figure of the motor when Fig. 3 shows use three phase converter of the present invention, " 100 "～" 101 " that go out to mark on hexagonal each summit correspond respectively to the on/off state of switch VT1, VT3, VT5.And, the on/off state of on-off element VT4, VT6, VT2 respectively with the on/off opposite states of on-off element VT1, VT3, VT5.
The figure of the situation when Fig. 4 shows space vector of voltage and is arranged in space vector of voltage figure the first sector shown in Figure 3 wherein, simply shows respectively VT1～VT6.
With reference to Fig. 3 and Fig. 4, the phase current values that will flow through each phase line of three phase alternating current motor is made as respectively ia, ib, ic, the current value of exporting from integrated operational amplifier A～C respectively is made as ia_ad, ib_ad, ic_ad, the flow direction of the electric current that will flow into to three phase alternating current motor is made as "+" direction, the flow direction of the electric current that will flow out from three phase alternating current motor is made as "-" direction, so, corresponding to the on off state of each sector and the relation between each phase current as described in the following table.
In addition, in the situation that three phase alternating current motor does not break down, its each phase load obviously is symmetrical all the time.Therefore, be under 110,101 and 011 the state, also can calculate each phase current on off state.For example under on off state is 110 situation, because it is symmetrical to be applied to the load of each phase, so set up following relational expression: ia=ib=-ic/2=-ic_ad/2.Be also to be same (seeing above table for details) under 101,011 the state on off state.
With reference to Fig. 4, as follows, can detect the three-phase current of motor.
(1) according to by not shown DSP(digital signal processor) the PWM(pulse-length modulation that generates) signal, judge which sector of the first sector that voltage vector is arranged in the space vector of voltage figure of motor as shown in Figure 3～the 6th sector;
(2) for example, when switching vector selector is 100, as shown in Figure 4, on-off element VT1, VT2, VT6 are in opening state, and on-off element VT3, VT4, VT5 are in off-state, and voltage vector is arranged in the first sector of the space vector of voltage figure of motor, therefore as described in the above-mentioned form
Current i b=ib_ad
Current i c=ic_ad
Current i a=-(ib+ic)=-(ib_ad+ic_ad).
(3) according to above method, can calculate the instantaneous value of the three-phase current of the motor in the first sector～the 6th sector.
At this, show for example the method for the electric current that detects three phase alternating current motor, but current of electric detection method of the present invention equally also can be applicable to detect in the above alternating current generator of two-phase or three-phase, as long as with the phase line of each phase of motor on-off element sequence, sampling resistor and integrated operational amplifier are set accordingly respectively.
Claims (10)
1. motor current detection device, each phase current for detection of motor is characterized in that, comprising:
Frequency converter, its each brachium pontis is connected with each phase line of said motor respectively, with regard to arbitrary brachium pontis in above-mentioned each brachium pontis, this brachium pontis is divided into top brachium pontis and bottom brachium pontis by the connected node that is connected with the phase line of said motor, above-mentioned top brachium pontis is connected with the positive pole of DC bus-bar voltage, above-mentioned bottom brachium pontis is connected with the negative pole of DC bus-bar voltage, be respectively equipped with on-off element for this brachium pontis of on/off at above-mentioned top brachium pontis and bottom brachium pontis, and each on-off element on above-mentioned each brachium pontis consists of PWM on-off element sequence;
A plurality of sampling resistors are located at respectively on the bottom brachium pontis of each brachium pontis of above-mentioned frequency converter;
Pick-up unit for detection of the electric current of the bottom brachium pontis of above-mentioned each brachium pontis that flows through above-mentioned frequency converter, calculates each phase current of said motor according to detected above-mentioned electric current.
2. motor current detection device according to claim 1, it is characterized in that, above-mentioned detection device comprises a plurality of integrated operational amplifiers, these integrated operational amplifiers are connected with above-mentioned sampling resistor respectively, for detection of the pressure drop on each above-mentioned sampling resistor, and with sending the next stage circuit of crossing the electric current of above-mentioned bottom brachium pontis for Flow to after the above-mentioned pressure drop amplification, detect thus the electric current that flows through above-mentioned lower brachium pontis.
3. motor current detection device according to claim 1 and 2 is characterized in that, said motor is three phase alternating current motor.
4. motor current detection device according to claim 1 and 2 is characterized in that, above-mentioned sampling resistor is noninductive resistance.
5. motor current detection device according to claim 1 and 2, above-mentioned a plurality of on-off elements are made of the IGBT that comprises NPN type triode.
6. current of electric detection method, each phase current for detection of the motor that is connected with frequency converter is characterized in that,
Each brachium pontis of above-mentioned frequency converter is connected with each phase line of said motor respectively, with regard to the arbitrary brachium pontis in above-mentioned each brachium pontis, this brachium pontis is divided into top brachium pontis and bottom brachium pontis by the connected node that is connected with the phase line of said motor, above-mentioned top brachium pontis is connected with the positive pole of DC bus-bar voltage, above-mentioned bottom brachium pontis is connected with the negative pole of DC bus-bar voltage, be respectively equipped with on-off element for this brachium pontis of on/off at above-mentioned top brachium pontis and bottom brachium pontis, and, each on-off element on above-mentioned each brachium pontis consists of PWM on-off element sequence, bottom brachium pontis at each brachium pontis of above-mentioned frequency converter is respectively equipped with sampling resistor
The said motor electric current detecting method comprises:
Detecting step according to the on/off state of said PWM on-off element sequence, detects the electric current of the bottom brachium pontis of above-mentioned each brachium pontis that flows through above-mentioned frequency converter;
Calculation procedure according to detected above-mentioned electric current, is calculated each phase current of said motor.
7. current of electric detection method according to claim 6, it is characterized in that, in above-mentioned detecting step, detect respectively the pressure drop on each above-mentioned sampling resistor, and with sending the next stage circuit of crossing the electric current of above-mentioned bottom brachium pontis for Flow to after the above-mentioned pressure drop amplification, detect thus the electric current that flows through above-mentioned bottom brachium pontis.
8. according to claim 6 or 7 described current of electric detection methods, it is characterized in that said motor is three phase alternating current motor.
9. according to claim 6 or 7 described current of electric detection methods, it is characterized in that above-mentioned sampling resistor is noninductive resistance.
10. according to claim 6 or 7 described current of electric detection methods, it is characterized in that above-mentioned a plurality of on-off elements are made of the IGBT that comprises NPN type triode.
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| CN107155352A (en) * | 2014-10-30 | 2017-09-12 | 株式会社辰巳菱机 | Load testing apparatus |
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| CN113533828A (en) * | 2021-08-12 | 2021-10-22 | 中车青岛四方机车车辆股份有限公司 | Detection device for power supply circuit of three-phase motor and power supply system |
| CN113533828B (en) * | 2021-08-12 | 2024-05-07 | 中车青岛四方机车车辆股份有限公司 | Detection device and power supply system of power supply circuit of three-phase motor |
| WO2024053452A1 (en) * | 2022-09-09 | 2024-03-14 | パナソニックＩｐマネジメント株式会社 | Multi-level inverter |
| WO2024053453A1 (en) * | 2022-09-09 | 2024-03-14 | パナソニックＩｐマネジメント株式会社 | Multi-level inverter |
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