EP1317673A1 - Circuit d'evaluation pour detecteur de courant, fonctionnant selon le principe de compensation et permettant notamment de mesurer des courants continus et des courants alternatifs, et procede d'exploitation d'un tel detecteur de courant - Google Patents

Circuit d'evaluation pour detecteur de courant, fonctionnant selon le principe de compensation et permettant notamment de mesurer des courants continus et des courants alternatifs, et procede d'exploitation d'un tel detecteur de courant

Info

Publication number
EP1317673A1
EP1317673A1 EP01967067A EP01967067A EP1317673A1 EP 1317673 A1 EP1317673 A1 EP 1317673A1 EP 01967067 A EP01967067 A EP 01967067A EP 01967067 A EP01967067 A EP 01967067A EP 1317673 A1 EP1317673 A1 EP 1317673A1
Authority
EP
European Patent Office
Prior art keywords
current
compensation
magnetic field
probe
digital
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01967067A
Other languages
German (de)
English (en)
Inventor
Hans-Georg KÖPKEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Publication of EP1317673A1 publication Critical patent/EP1317673A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
    • G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
    • G01R15/185—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core with compensation or feedback windings or interacting coils, e.g. 0-flux sensors

Definitions

  • the invention relates to a current sensor based on the compensation principle, in particular for measuring direct and alternating currents, in which the magnetic field generated in a magnetic core by a primary winding through which the current to be measured flows is compensated by a compensation current in a secondary winding, with the control of the compensation current at least one sensor influenced by the magnetic field detects deviations from the zero flow and feeds this as a measured value via the evaluation circuit to an amplifier arrangement to achieve the compensation current, the amplifier arrangement generating the compensation current in accordance with a pulsed control signal generated by the control circuit as a function of the measurement value in switching operation controls.
  • Such current sensors are also known under the technical term compensation current transformers and are used to measure direct and alternating currents in that the magnetic field generated by the measuring current in a magnetic core is compensated by a compensating current in a secondary winding.
  • a sensor is provided in the magnetic circuit, usually a magnetic field probe, which detects the deviations from the zero field.
  • the secondary current is an exact image of the current to be measured (cf. DE 3718857 AI).
  • the object of the present invention is a cost reduction compared to conventional current transformers, the accuracy having to be maintained.
  • the electronics should be integrable.
  • operation with a simple 5V supply is desirable for smaller current ranges.
  • this object is achieved by a method for operating a current sensor based on the compensation principle, in particular for measuring direct and alternating currents, in which the magnetic field generated in a magnetic core by a primary winding through which the current to be measured flows is generated by a compensation current in a secondary winding is compensated for, in order to control the compensation current, deviations from the zero flux are detected by a magnetic field probe and converted into a pulsed control signal, which is amplified to achieve the compensation current, and in that the pulsed control signal is derived from the probe current by the following method steps: - Excitation the magnetic field probe with a predetermined frequency and
  • This method according to the present invention can be solved particularly advantageously by means of an evaluation circuit for a current sensor based on the compensation principle, in particular for measuring direct and alternating currents, in which the magnetic field generated in a magnetic core by a primary winding through which the current to be measured flows is generated by a compensating current a secondary winding is compensated, with at least one sensor influenced by the magnetic field detecting deviations from the zero flux for controlling the compensation current and feeding this as a measured value via the evaluation circuit to an amplifier arrangement to achieve the compensation current, the amplifier arrangement generating the compensation current in accordance with one of the control circuit as a function of the measured value controls pulsed control signal in switching operation, the control circuit comprising the following elements: a first oscillator with a predetermined frequency to excite the Magnetic field probe, one or more electrical resistors at any point through which the magnetic field probe current flows to generate one or more potentials dependent on the probe current, - at least one comparator for converting one or more potentials into one or more discrete-value digital signals by comparison with one or
  • one or more potentials can also be converted into one or more discrete-value digital signals by evaluating potential differences.
  • the evaluation method or the evaluation circuit according to the present invention thus allows a completely digital implementation of the control electronics.
  • the magnetic field probe is fed, for example, via resistors with a rectangular voltage of a given frequency (e.g. 250 kHz), the probe signal is recorded by one or two comparators and the pulse widths are measured with counters.
  • the conventional analog output stage for the compensation current is replaced by a PWM output stage (frequency e.g. 1 MHz) with an upstream sigma-delta modulator.
  • the time measurement of the digital signals is particularly advantageously carried out by forming the difference between the times of the positive and the negative magnetic field probe control, this time difference being regulated to zero in such a way that deviations from the zero flow are eliminated.
  • complete suppression of the magnetic field probe frequency is made possible by the synchronization of the excitation of the magnetic field probe and the derivation of binary switching signals, in particular phase synchronization by means of a digital phase ocked-oop.
  • the evaluation circuit according to the invention has a synchronization device for synchronizing the first and the second oscillator, in particular a phase synchronization by means of a digital phase-locked loop.
  • synchronization to the subsequent measured value processing which in turn can be synchronized to a ripple that may be present on the current to be measured, is particularly advantageous.
  • Another advantageous embodiment uses the inductance of the compensation winding to smooth the compensation current.
  • evaluation method according to the invention or the corresponding evaluation circuit are tailored for integration in an integrated circuit such as, for example, a user-specified integrated circuit ASIC.
  • the evaluation circuit according to the invention can be used particularly advantageously with a current sensor described at the outset based on the compensation principle.
  • FIG. 1 block diagram of a compensation current transformer with evaluation according to the invention
  • FIG. 2 detection of the probe voltage FIG. 3 curve of the magnetic field probe voltage
  • FIG. 4 block diagram of the digital signal processing
  • the magnetic part is shown on the left, which contains a main core 1 with primary winding wl and compensation winding w2 and a flux probe 2.
  • the 'primary winding wl performs the measurement current il, and has a significantly lower number of turns (possibly only one turn) and the compensation winding w2.
  • the flow probe 2 consists, for example, of a Vitrovac® strip and a sensor coil w3.
  • the control 3 an oscillator, excites the magnetic field probe 2. This is followed by the actual evaluation with the circuit blocks 4 to 7 (to be explained in more detail below) and an output stage 8 operating in switching mode in order to regulate the compensation current i2 in such a way that the magnetic flux becomes zero.
  • the compensation current i2 is an image of the primary current il and can be processed further.
  • the pulsed output voltage of the output stage 8 is filtered.
  • the resulting compensation current i2 is sent through the compensation winding w2 and generates an output signal U via a terminating resistor 10 connected in series with the compensation winding w2, which is proportional to the compensation current i2 and with successful "correction of a deviation from the zero flow is also proportional to the measuring current il. ' • ...
  • the field probe 2 in the exemplary embodiment uses the extremely nonlinear, but exactly point-symmetrical magnetization characteristic of a Vitrovac® strip. With an alternating voltage with a frequency of 200 kHz to 500 kHz, the Vitrovac ⁇ strip is periodically driven in both directions up to saturation. Depending on the magnetic flux in the circle, an asymmetry arises which is evaluated.
  • the first variant is used, but due to the analog peak value rectification and further processing, it is not well suited for integration into an application-specific integrated circuit (ASIC).
  • ASIC application-specific integrated circuit
  • the aim of the invention presented here is to implement the previously unknown fixed-frequency square-wave power supply (third variant), which, as a further great advantage, enables the probe excitation to be synchronized with the switching frequency.
  • the conventional problem of the current ripple transmitted by the magnetic coupling from the probe 2 to the output current i2 in an integrating current measurement is eliminated without the need for complex and bandwidth-limiting analog filters.
  • the duty cycle is evaluated in a fully synchronized, purely digital design and can therefore be integrated in an ASIC.
  • the resulting curve has a short time constant at the beginning and end (relatively steep curve) and a flat area in between (corresponds to the steep branch of the hysteresis loop), the position of which shifts depending on the total flow ⁇ .
  • the difference between the pulse widths t1 and t2 in FIG. 2 is to be used for evaluation. If there is zero flow, the pulses P1 and P2 are of equal size, otherwise the pulses diverge. The difference between the pulse widths - and therefore the time difference between tl and t2 - must be regulated to zero.
  • the pulses P1 and P2 are converted into digital signals by two comparators (see elements 4a, 4b in FIG. 3) in a conversion device 4 shown in FIG.
  • the illustration according to FIG. 3 shows two possible forms of the construction of this comparator circuit, on the left a variant with two comparators 4a, 4b and in the right circuit a variant that manages with a comparator 4a.
  • the left circuit variant consists of a full-bridge arrangement for the magnetic field probe 2, which is fed from a voltage source.
  • Two resistors R1 and R2 connected in series to the left and right of the probe 2 are flowed through by the probe current and generate potentials which are dependent on the probe current and are evaluated by the two comparators 4a, 4b.
  • a switching threshold shortly above zero e.g. 2V as shown in FIG. 2, as small as possible
  • a shortly below zero e.g. -2V, as small as possible
  • FIG. 3 Since an asymmetry in the switching thresholds leads to an offset, the one shown in FIG variant shown on the left is selected, in which only one switching threshold is required.
  • the circuit variant according to FIG. 3 on the right avoids this source of error by measuring via a resistor R3 located in the common ground branch of the bridge, so that only one comparator 4a is required.
  • the voltage swing is smaller and the gate currents flow through the resistor at the switching instant when the gate is ground-related.
  • a capacitor (not shown) can be connected in parallel.
  • the gate voltage changes with ground-related gate control, which limits the maximum permissible voltage drop across the measuring resistor R3.
  • the excitation of the probe 2 takes place with a square-wave voltage of a predetermined frequency, which is generated by the block 3.
  • the signal of a half-bridge (two switches one above the other in FIG. 3) is shifted by one clock every second period, that is to say briefly 0 V to the
  • Probe placed. This causes the pulse end to be shifted by about half a cycle, so that with corresponding intermediate values, the pulse width measured with a digital counter changes between two adjacent measured values.
  • a slowly changing current i2 from -2 mA to 2 mA is fed in, whereby the primary winding wl remains open.
  • the compensation current and the resulting probe voltage mean that the position of the thresholds can be important. It can be seen that with the same thresholds for both comparators 4a, 4b there is no offset, but with smaller thresholds the linear working range of the probe is larger. As expected, an offset results for different thresholds.
  • the small offset which is also visible with symmetrical thresholds, can have various causes, e.g. remanence, external fields, etc.
  • the influence of errors in the time measurement (pulse width measurement) on the compensation current can be determined from the slope of the curves.
  • Such measurement errors arise, for example, from the runtime differences of the two comparators and from the influence of the temporal quantization, since the pulse width is determined in an isochronous design with an inaccuracy of half the clock signal.
  • the influence of offset errors of the comparators can be determined from the displacement of the curves at different thresholds.
  • the magnetic flux is regulated to zero with a PI controller 6 (cf. FIG. 1).
  • a change in the primary current il initially leads to a corresponding jump in the secondary current via the direct magnetic coupling; the magnetic flux (and thus the control loop) does not initially react.
  • the secondary current then begins to subside, so that the total flow in circuit 1 is no longer zero and a magnetic flux is formed, which is recognized by probe 2.
  • the PI controller 6 now begins to raise the secondary current again, so that the flow becomes steadily zero.
  • the integral part (I part) ensures that the stationary control deviation becomes zero.
  • the stationary error is thus determined exclusively by the measuring accuracy of the field probe 2.
  • a pulse width modulation output stage 7 (PWM) is used as an actuator.
  • PWM pulse width modulation output stage 7
  • a high switching frequency typically 1 MHz
  • an LC filter 9 typically dimensioning 100 ⁇ H, 100mF
  • the dynamic behavior of the LC filter 9 must be taken into account when setting the PI controller 6, as must the dynamic behavior of the compensation winding w2.
  • FIG. 4 shows a block diagram of the digital signal processing according to the invention, which is explained in more detail below.
  • the resolution of the clock-synchronously controlled PWM output stage 8 is relatively low, with a system clock of 80 MHz and a PWM output frequency of 1 MHz there are 80 stages, that is less than 7 bit resolution.
  • the PI controller 6 would recognize the errors resulting from this quantization in the resulting flow and would counteract them accordingly. resulting oscillations are, however, relatively large and deeply frequented.
  • a second-order sigma-delta modulator 7b connected upstream of the PWM unit 7a ensures that the desired voltage is set on average by varying the duty cycle.
  • the variation is such that the deviations are as high-frequency as possible and are therefore well suppressed by the low-pass filters (LC filter 9 and compensation winding w2) and a subsequent integrating current measurement.
  • the probe excitation 3 takes place synchronously to the PWM output by means of a corresponding clock signal 11a, for example with a quarter of the frequency, that is with 250 kHz.
  • the entire signal processing takes place, for example, synchronously with a system clock of 80 MHz, for example.
  • the jitter that generally arises between the asynchronous subsystem is not critical for the system behavior given such a high clock frequency.
  • a phase controller 11c (digital phase-locked loop PLL) ensures that the PWM 7, 7a and the probe excitation 3 can be synchronized with an externally predetermined signal 12 (typically the current controller sampling clock of 16 kHz, for example).
  • the synchronization takes place via counter 11, so that the resulting PWM signal follows the external synchronization signal 12 with a jitter of one or a few 80 MHz periods.
  • the entire system works isochronously, for example at 80MHz or 40MHz.
  • the frequency is regulated by the digital PLL 11c in such a way that the excitation of the probe takes place in phase synchronization with the externally predetermined synchronization signal 12. All that remains is a low jitter of a few 80 MHz periods, ie a few 10ns.
  • the PWM output stage 7a in turn switches in phase synchronization with the probe excitation 3.
  • the signals provided on the input side by the comparators 4a, 4b are further processed by two timer blocks 5a, 5b, which measure the pulse widths tl, t2 of the positive and negative probe voltages Pl, P2.
  • different comparators 4a, 4b or the same comparator 4a are used for both pulses P1, P2, as explained above.
  • the output signal is the pulse width measured in cycles from the system cycle.
  • the following block 5c forms the time difference and outputs this as signal e to the PI controller 6. If a predetermined maximum time difference is exceeded and if a predetermined minimum pulse duration is undershot, the output signal from block 5c is held at the corresponding maximum value.
  • a PI controller 6 with limitation has proven to be advantageous as a flow controller.
  • the value for limiting the control behavior can now be reduced so that the integrator does not leave the adjustment range that can be realized by the PWM.
  • the actual pulse width modulation takes place in block 7a.
  • This block receives the period by the phase controller 11c and the on time fcr ⁇ d from the quantization block 7c. Since only 80 levels can be set for the duty cycle at a PWM frequency of 1 MHz and a quartz frequency of 80 MHz, the quantization is taken into account.
  • the quantization takes place in block 7c, which receives the nominal voltage as a signed number with decimal places and the period m from the sigma-delta modulator 7b. From this, the switchover time is calculated and the signal fb is generated as feedback, which corresponds to the realized voltage and is fed back to the input of the sigma-delta modulator 7b.
  • Block 7b contains a second-order sigma-delta modulator.
  • a possible embodiment of the sigma-delta modulator 7b with subsequent quantization 7c is shown in the illustration in FIG.
  • the manipulated variable is set on the input side by the PI controller 6.
  • the sigma-delta modulator 7b supplies an unquantized signal m, which serves as an input signal for the subsequent quantization 7c.
  • the quantization 7c also supplies the feedback signal fb. 5 shows how fb is exactly fed back to the sigma-delta modulator 7b.
  • this sigma-delta modulator 7b acts like a dead time of one cycle.
  • the signal m changes by a few LSB (low significant bits) above and below the signal, switch back and forth.
  • An additional digital pseudo noise signal 'dither' can be used to avoid fertilization of limit cycles, as shown in FIG 5, are fed.
  • the double integrator structure ensures that the amplitude of the resulting interference spectrum is square over frequency in a wide range. This means that the interference is extremely small in the low-frequency useful signal range.
  • the larger interference amplitudes in the higher-frequency range are suppressed by the LC filter 9 (see FIG. 1) and the inductance of the compensation winding w2.
  • a limitation of the sigma-delta modulator 7b should be set to a high value; a limitation related to the actuating range must take place in the PI controller 6. The limit set in the PI controller 6 must still leave some space for the noise generated by the sigma-delta modulator 7b.
  • the goal of saving costs compared to conventional compensation current transformers can be achieved by integrating the evaluation or signal processing according to the invention into an ASIC.
  • a multitude of possibilities is conceivable to divide the required function blocks over one or more ASICs.
  • the representation according to FIG. 6 shows some conceivable variants.
  • each ASIC has an excitation 3, a switching threshold generator 4 with comparators (cf. FIG. 3), a block for digital signal processing with elements 5, 6, 7 according to the block diagram shown in FIG. 4, an amplifier device in the form of an output stage 8 and additionally an analog / digital converter 15 for converting the output voltage U falling across the resistor 10 and proportional to the measuring current il.
  • This variant allows the electronics to be placed directly on the magnetic part of the current transformer, which may be cheap for larger systems.
  • a one or two-phase measurement is also possible, three ASICs are required for the three-phase measurement that is usually required, which leads to a large number of items and thus favors cost-effective mass production.
  • FIG. 6b alternatively shows a division of the circuit into a digital part ASIC A4 and a mixed signal ASIC part A5 (includes the analog-digital converter 15 for all three phases).
  • the development effort for a purely digital ASIC is significantly less, in addition, the fast-clocking parts and the high-power output stages are separated from the sensitive A / D converters 15. It should be noted that a comparator with defined scarf 'will compel tthreshold and large power transistors Working in the "digital" ASIC.
  • the output stages 8 are also outsourced from the ASIC A6. If you provide a + -15V supply and external power amplifiers 8, you can connect the load resistor 10 on one side to a fixed reference potential, e.g. 2V. This enables the use of cheaper A / D converters, e.g. with an input range from 0V to 4V, as they are integrated in some microcontrollers.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Magnetic Variables (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

La présente invention concerne un traitement de signal qui permet la réalisation complètement numérique d'un équipement électronique, ce qui permet de réduire les frais grâce à une intégration complète dans un circuit intégré à application spécifique (application specific integrated circuit : ASIC). Selon cette invention, la sonde de champ magnétique est par exemple alimentée avec une tension carrée de fréquence prédéfinie, par l'intermédiaire de résistances, le signal de sonde est détecté par un ou deux comparateurs et les durées d'impulsion sont mesurées de manière numérique à l'aide de compteurs. De plus, les étages de sortie analogiques classiques pour le courant de compensation sont remplacés par des étages de sortie de modulation de largeur d'impulsion comprenant un modulateur sigma-delta monté en amont. Une synchronisation par rapport à un signal de synchronisation prédéfini (par exemple issu du traitement des valeurs de mesure) est possible.
EP01967067A 2000-09-13 2001-09-03 Circuit d'evaluation pour detecteur de courant, fonctionnant selon le principe de compensation et permettant notamment de mesurer des courants continus et des courants alternatifs, et procede d'exploitation d'un tel detecteur de courant Withdrawn EP1317673A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10045194 2000-09-13
DE10045194A DE10045194A1 (de) 2000-09-13 2000-09-13 Auswerteschaltung für einen Stromsensor nach dem Kompensationsprinzig, insbesondere zur Messung von Gleich- und Wechselströmen, sowie Verfahren zum Betrieb eines solchen Stromsensors
PCT/DE2001/003356 WO2002023204A1 (fr) 2000-09-13 2001-09-03 Circuit d'evaluation pour detecteur de courant, fonctionnant selon le principe de compensation et permettant notamment de mesurer des courants continus et des courants alternatifs, et procede d'exploitation d'un tel detecteur de courant

Publications (1)

Publication Number Publication Date
EP1317673A1 true EP1317673A1 (fr) 2003-06-11

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EP01967067A Withdrawn EP1317673A1 (fr) 2000-09-13 2001-09-03 Circuit d'evaluation pour detecteur de courant, fonctionnant selon le principe de compensation et permettant notamment de mesurer des courants continus et des courants alternatifs, et procede d'exploitation d'un tel detecteur de courant

Country Status (5)

Country Link
US (1) US6990415B2 (fr)
EP (1) EP1317673A1 (fr)
CN (1) CN1243986C (fr)
DE (1) DE10045194A1 (fr)
WO (1) WO2002023204A1 (fr)

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Also Published As

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CN1461413A (zh) 2003-12-10
US6990415B2 (en) 2006-01-24
DE10045194A1 (de) 2002-03-28
WO2002023204A1 (fr) 2002-03-21
CN1243986C (zh) 2006-03-01
US20040204875A1 (en) 2004-10-14

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