JP4753966B2 - Power conversion device and temperature correction method for current sensor device - Google Patents

Power conversion device and temperature correction method for current sensor device Download PDF

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JP4753966B2
JP4753966B2 JP2008134524A JP2008134524A JP4753966B2 JP 4753966 B2 JP4753966 B2 JP 4753966B2 JP 2008134524 A JP2008134524 A JP 2008134524A JP 2008134524 A JP2008134524 A JP 2008134524A JP 4753966 B2 JP4753966 B2 JP 4753966B2
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史人 田中
祐司 蔵本
泰介 岩切
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Mitsubishi Electric Corp
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Description

本発明は、電力変換装置並びに電流センサ装置の温度補正方法に関する。 The present invention relates to a temperature compensation method of the power converter and current sensor device.

電力変換装置では、モータ等の負荷を最適に駆動するために負荷電流を逐次測定及び制御する必要があり、従来、非接触型の電流センサであるホール素子が多く用いられている。ホール素子は、素子に直交する磁界に比例した電圧を発生する磁界-電圧変換素子であり、ホール素子により得られるセンサ信号値は、下記の式１により補正される。なお、式１においてＶ０’は補正済信号値、Ｖoutはセンサ信号値、Ｖoffは無磁界時のセンサ信号値、Ｇは物理量変換係数である。
Ｖ０’＝Ｇ×（Ｖout−Ｖoff） （１） In a power conversion device, it is necessary to sequentially measure and control a load current in order to optimally drive a load such as a motor. Conventionally, a Hall element that is a non-contact type current sensor is often used. The Hall element is a magnetic field-voltage conversion element that generates a voltage proportional to a magnetic field orthogonal to the element, and a sensor signal value obtained by the Hall element is corrected by the following Equation 1. In Equation 1, V 0 ′ is a corrected signal value, Vout is a sensor signal value, Voff is a sensor signal value when there is no magnetic field, and G is a physical quantity conversion coefficient.
V 0 ′ = G × (Vout−Voff) (1)

従来の電流センサは、物理量変換後の電流値を高精度とするために、センサ信号値Ｖoutに対して個体及び温度変動を抑制する必要があった。従来、ホール素子を利用した一般的な電流センサ回路（図３参照）において個体差を抑制するための手法として、抵抗Ｒ２をトリミングにより調整し、磁界印加時のセンサ信号値Ｖoutを所望の値としていた。また、温度変動を抑制する手法として、特許文献1では、抵抗Ｒ２に感温素子であるサーミスタを配置することで、周囲温度の影響によるセンサ出力電圧の変動を抑制した電流センサ装置が示されている。
特開２００２−７１７７３号公報 The conventional current sensor needs to suppress individual and temperature fluctuations with respect to the sensor signal value Vout in order to make the current value after physical quantity conversion highly accurate. Conventionally, as a technique for suppressing individual differences in a general current sensor circuit using a Hall element (see FIG. 3), the resistor R2 is adjusted by trimming, and the sensor signal value Vout at the time of applying a magnetic field is set as a desired value. It was. As a technique for suppressing temperature fluctuation, Patent Document 1 discloses a current sensor device in which a thermistor, which is a temperature sensitive element, is arranged in a resistor R2, thereby suppressing fluctuation in sensor output voltage due to the influence of ambient temperature. Yes.
JP 2002-71773 A

このように、ホール素子は同一磁界に対して個体差及び温度変動が大きく、センサ出力信号の個体差及び温度変動を抑制する必要があった。しかし、上述のトリミングによる手法では、高価なトリミング装置が必要であるため加工費が高くなり、また、所望のセンサ信号値が得られるまで調整作業を繰り返すため長時間を要し、さらにトリミングに失敗した場合、再調整はできないため歩留まりが低下するという問題があった。また、上記特許文献１による温度変動を抑制する手法では、サーミスタの温度特性にも個体差があるため、ホール素子の温度特性と一致性が高くなければ所望の精度が得られないという課題がある。   As described above, the Hall elements have large individual differences and temperature fluctuations with respect to the same magnetic field, and it is necessary to suppress individual differences and temperature fluctuations of the sensor output signal. However, the above-described trimming method requires an expensive trimming device, which increases the processing cost, and requires a long time to repeat adjustment work until a desired sensor signal value is obtained, and further trimming fails. In such a case, since readjustment cannot be performed, there is a problem that the yield decreases. In addition, the technique for suppressing temperature fluctuation according to Patent Document 1 has a problem that desired accuracy cannot be obtained unless the temperature characteristics of the Hall element are high because the temperature characteristics of the thermistor have individual differences. .

本発明は、上記のような問題点を解消するためになされたもので、出力信号の個体差及び温度変動を抑制するための調整作業にかかる加工費を低減し、調整時間を短縮し、さらに歩留まり向上を図ることが可能な電流センサ装置を備えることにより、モータ駆動の制御が高精度で行える電力変換装置を得ることを目的とする。 The present invention has been made to solve the above-described problems, and reduces processing costs for adjustment work for suppressing individual differences in output signals and temperature fluctuations, shortening adjustment time, and It is an object of the present invention to provide a power conversion device capable of controlling motor drive with high accuracy by providing a current sensor device capable of improving yield .

さらに、加工費の低減及び調整時間の短縮を図ることが可能な電流センサ装置の温度補正方法を提供することを目的とする。   Furthermore, it aims at providing the temperature correction method of the current sensor apparatus which can aim at reduction of processing cost and shortening of adjustment time.

本発明に係る電力変換装置は、モータ駆動時の電流を電流センサ装置により測定しモータ制御を行う電力変換装置であって、電流センサ装置は、被測定電流により発生する磁界の値に応じて変化する信号を出力し、この出力信号を出力電圧に変換する電流センサ回路と、電流センサ回路の出力電圧を補正するための検出値補正情報を記憶する記憶手段と、電流センサ回路の周囲温度を測定する感温素子を備え、検出値補正情報は、電流センサ回路からの出力電圧情報と、感温素子からの周囲温度情報と、電流センサ回路の調整時において磁気回路が無い状態で基準磁界発生装置により求めたゲインとその時の周囲温度情報から得られるゲインの温度特性情報と、電流センサ回路の調整時において磁気回路を付属した状態で求めた基準温度ゲイン情報と、基準温度ゲイン情報から求められる基板基準温度ゲイン情報と、ゲインの温度特性情報に基づき求められる基板に磁気回路を付属した状態におけるゲインの温度特性情報αを含み、基準温度ゲイン情報とゲインの温度特性情報αから得られるグラフより出力ゲインを算出し、下式により電流センサ回路の出力電圧を温度補正した補正済電流値を得るものである。
Ｉ’＝Ｇct(T)×（Ｖout−Ｖoff）
Ｉ’は補正済電流値、Ｇct(T)は出力ゲイン、Ｖoutはセンサ信号値、Ｖoffは無磁界時のセンサ信号値。 A power conversion device according to the present invention is a power conversion device that controls a motor by measuring a current when a motor is driven by a current sensor device, and the current sensor device changes according to a value of a magnetic field generated by a current to be measured. A current sensor circuit for converting the output signal into an output voltage, storage means for storing detection value correction information for correcting the output voltage of the current sensor circuit, and measuring the ambient temperature of the current sensor circuit The detection value correction information includes output voltage information from the current sensor circuit, ambient temperature information from the temperature sensor, and a reference magnetic field generator in the absence of a magnetic circuit when adjusting the current sensor circuit. the gain temperature characteristic information of the gain obtained from the ambient temperature information at that time was determined, the reference temperature determined by the state that came magnetic circuit at the time of adjustment of the current sensor circuit Gay Wherein the information, and a substrate reference temperature gain information obtained from the reference temperature gain information, a temperature characteristic information of the gain α in a state that came the magnetic circuit substrate obtained based on the temperature characteristic information of the gain, the reference temperature gain information and gain The output gain is calculated from the graph obtained from the temperature characteristic information α, and a corrected current value obtained by temperature-correcting the output voltage of the current sensor circuit is obtained by the following equation .
I ′ = Gct (T) × (Vout−Voff)
I ′ is the corrected current value, Gct (T) is the output gain, Vout is the sensor signal value, and Voff is the sensor signal value when there is no magnetic field.

また、本発明に係る電流センサ装置の温度補正方法は、被測定電流により発生する磁界の値に応じて変化する信号を検出し、この出力信号を出力電圧に変換する電流センサ回路と、電流センサ回路の出力電圧を補正するための検出値補正情報を記憶する記憶手段と、電流センサ回路の周囲温度を測定する感温素子を有する電流センサ装置の温度補正方法であって、電流センサ回路の調整時において、電流センサ回路が搭載された基板単体にて、磁気回路が無い状態で基準磁界発生装置より求めたゲインとその時の周囲温度からゲインの温度特性情報を求め、続いて基板に磁気回路を付属した状態にて通電を行うことにより基準温度ゲイン情報を求め、これらを検出値補正情報として前記記憶手段に書き込む第１のステップと、第１のステップで求めた基準温度ゲイン情報のグラフを直線補間することにより基板基準温度ゲイン情報を求め、検出値補正情報として記憶手段に書き込む第２のステップと、第１のステップで求めたゲインの温度特性情報に基づき基板に磁気回路を付属した状態におけるゲインの温度特性情報αを求め、検出値補正情報として記憶手段に書き込む第３のステップと、記憶手段に書き込まれた基準温度ゲイン情報とゲインの温度特性情報αから得られるグラフより出力ゲインを算出し、下式により電流センサ回路の出力電圧を温度補正した補正済電流値を得る第４のステップを含むものである。
Ｉ’＝Ｇct(T)×（Ｖout−Ｖoff）
Ｉ’は補正済電流値、Ｇct(T)は出力ゲイン、Ｖoutはセンサ信号値、Ｖoffは無磁界時のセンサ信号値。 A temperature correction method for a current sensor device according to the present invention detects a signal that changes in accordance with the value of a magnetic field generated by a current to be measured, and converts the output signal into an output voltage, and a current sensor A temperature correction method for a current sensor device having storage means for storing detection value correction information for correcting the output voltage of the circuit and a temperature sensing element for measuring the ambient temperature of the current sensor circuit, the adjustment of the current sensor circuit during at substrate alone by the current sensor circuit is mounted, determine the gain temperature characteristic information from the ambient temperature at that time and gain determined from the reference magnetic field generator in a state the magnetic circuit is not, a magnetic circuit on the substrate followed by determined reference temperature gain information by performing energization with accessory state, a first step of writing in the storage means them as detection values correction information, a first step Seeking substrate reference temperature gain information by linearly interpolating the graph of the reference temperature gain information calculated, a second step of writing into the storage means as a detected value correction information, the temperature characteristic information of the gain obtained in the first step Based on the third step of obtaining the gain temperature characteristic information α in the state where the magnetic circuit is attached to the substrate and writing the detected value correction information in the storage means, the reference temperature gain information written in the storage means and the gain temperature characteristic information This includes a fourth step of calculating an output gain from a graph obtained from α and obtaining a corrected current value obtained by temperature-correcting the output voltage of the current sensor circuit by the following equation .
I ′ = Gct (T) × (Vout−Voff)
I ′ is the corrected current value, Gct (T) is the output gain, Vout is the sensor signal value, and Voff is the sensor signal value when there is no magnetic field.

本発明によれば、電流センサ回路により検出された出力電圧を記憶手段に記憶させた検出値補正情報により補正し、出力電圧の個体差を抑制した電流センサ装置を備えることにより、モータ制御を高精度で行える電力変換装置を得ることができる。 According to the present invention, by providing a current sensor apparatus which suppresses individual difference of the corrected output voltage value detected by the correction information stored the detected output voltage in the storage means by the current sensor circuit, the motor control A power converter that can be performed with high accuracy can be obtained.

また、本発明に係る電流センサ装置の温度補正方法によれば、記憶手段に書き込まれた検出値補正情報により個々の電流センサ回路の温度特性に応じた温度補正が行えるため、電流センサ装置の出力電圧の温度変動を高精度で抑制することができ、加工費の低減及び調整時間の短縮を図ることができる。   Further, according to the temperature correction method of the current sensor device according to the present invention, since the temperature correction according to the temperature characteristics of each current sensor circuit can be performed by the detection value correction information written in the storage means, the output of the current sensor device The temperature fluctuation of the voltage can be suppressed with high accuracy, and the processing cost can be reduced and the adjustment time can be shortened.

参考例１．
図１は、本発明の参考例１に係る電流センサ装置の構成を示す概略図である。本参考例１における電流センサ装置１は、モータ制御系の電力変換装置においてモータの負荷電流を測定するものであり、電流センサ回路２と、この電流センサ回路２の出力電圧を補正するための検出値補正情報を記憶する記憶手段である記憶装置３とを、同一のプリント基板上に配置したものである。 Reference Example 1
FIG. 1 is a schematic diagram showing a configuration of a current sensor device according to Reference Example 1 of the present invention. The current sensor device 1 in the present reference example 1 measures a load current of a motor in a power conversion device of a motor control system, and a current sensor circuit 2 and detection for correcting an output voltage of the current sensor circuit 2 A storage device 3 which is a storage means for storing value correction information is arranged on the same printed circuit board.

電流センサ回路２は、例えばホール素子であり、素子に直交する磁界に比例した電圧を発生する。すなわち、被測定電流により発生する磁界の値に応じて変化する信号を出力する磁気センサ部と、この出力信号を出力電圧に変換する変換手段を備えている。ただし、電流センサ回路２は、ホール素子のような磁界-電圧変換素子に限定されるものではなく
、ＭＲ素子やＧＭＲ素子等の磁気電圧変換素子を用いてもよい。 The current sensor circuit 2 is a Hall element, for example, and generates a voltage proportional to a magnetic field orthogonal to the element. That is, a magnetic sensor unit that outputs a signal that changes in accordance with the value of the magnetic field generated by the current to be measured, and conversion means that converts the output signal into an output voltage are provided. However, the current sensor circuit 2 is not limited to a magnetic field-voltage conversion element such as a Hall element, and a magnetic voltage conversion element such as an MR element or a GMR element may be used.

また、記憶装置３としては、主に半導体メモリが用いられるが、電流センサ回路２の出力電圧を補正するための検出値補正情報を記憶することができる手段であれば特に限定するものではない。記憶装置３に記憶される検出値補正情報としては、電流センサ装置１の調整時において、電流センサ回路２に流した負荷電流に対するセンサ出力電圧から求めた物理量変換係数Ｇが少なくとも含まれる。物理量変換係数Ｇの求め方については参考例２で説明する。 As the storage device 3, a semiconductor memory is mainly used. However, the storage device 3 is not particularly limited as long as it can store detection value correction information for correcting the output voltage of the current sensor circuit 2. The detected value correction information stored in the storage device 3 includes at least the physical quantity conversion coefficient G obtained from the sensor output voltage with respect to the load current that has been passed through the current sensor circuit 2 when the current sensor device 1 is adjusted. Reference example 2 will explain how to obtain the physical quantity conversion coefficient G.

さらに、本参考例１における電流センサ装置１は、図２に示すように、記憶装置３に記憶された検出値補正情報を、外部（図２では電力変換装置の駆動用回路４）に伝達する伝達手段５を有している。伝達手段５は、例えば記憶装置３に記憶された電流センサ回路２周辺の温度情報等を駆動用回路４に伝達することができる。 Furthermore, as shown in FIG. 2, the current sensor device 1 according to the first reference example transmits the detection value correction information stored in the storage device 3 to the outside (the drive circuit 4 of the power conversion device in FIG. 2). A transmission means 5 is provided. The transmission unit 5 can transmit, for example, temperature information around the current sensor circuit 2 stored in the storage device 3 to the driving circuit 4.

本参考例１の比較例として、ホール素子を利用した一般的な電流センサ回路の調整方法を図３及び図４を用いて説明する。図３は、ホール素子を利用した一般的な電流センサ回路を示しており、バッファ回路であるＯＰアンプ１１とホール素子１２及び抵抗Ｒ１、Ｒ２を有している。また、図４は、図３に示す電流センサ回路のトリミングによる調整
方法を示している。図４に示すように、トリミングによる調整方法では、抵抗Ｒ２をトリミングにより所望のセンサ信号値（Ｖout）が得られるまで調整する作業を繰り返すため
、長時間を要していた。また、トリミング装置は高価であるため加工費が高くなり、さらにトリミングに失敗した場合、再調整はできないため歩留まり低下の原因となっていた。 As a comparative example of the reference example 1 , a general method of adjusting a current sensor circuit using a Hall element will be described with reference to FIGS. FIG. 3 shows a general current sensor circuit using a Hall element, which includes an OP amplifier 11 that is a buffer circuit, a Hall element 12, and resistors R1 and R2. FIG. 4 shows an adjustment method by trimming the current sensor circuit shown in FIG. As shown in FIG. 4, in the adjustment method by trimming, the operation of adjusting the resistor R2 until the desired sensor signal value (Vout) is obtained by trimming takes a long time. Further, since the trimming apparatus is expensive, the processing cost is high, and if trimming fails, readjustment cannot be performed, which causes a decrease in yield.

本参考例１における電流センサ装置１によれば、電流センサ回路２により検出された出力電圧を、電流センサ回路２と同一のプリント基板上に配置された記憶装置３に記憶させた検出値補正情報により補正することにより、センサ出力信号の個体差を抑制することが可能である。また、トリミング装置を必要としないため、電流センサ装置１の個体差を抑制するための調整作業における加工費を低減でき、調整時間の短縮及び歩留まりの向上が図られる。 According to the current sensor device 1 in the present reference example 1 , the detected value correction information in which the output voltage detected by the current sensor circuit 2 is stored in the storage device 3 arranged on the same printed circuit board as the current sensor circuit 2 is used. It is possible to suppress the individual difference of the sensor output signal by correcting by the above. Moreover, since a trimming device is not required, the processing cost in the adjustment work for suppressing the individual difference of the current sensor device 1 can be reduced, and the adjustment time can be shortened and the yield can be improved.

参考例２．
図５は、本発明の参考例２に係る電力変換装置の構成を示す概略図である。なお、図５中、図２と同一、相当部分には同一符号を付し、説明を省略する。本参考例２における電力変換装置６は、上記参考例１における電流センサ装置１と、電力変換装置６を駆動するための駆動用回路４を、同一ユニットに配置することにより一体化したものである。 Reference Example 2
FIG. 5 is a schematic diagram showing a configuration of a power conversion device according to Reference Example 2 of the present invention. 5 that are the same as or equivalent to those in FIG. 2 are assigned the same reference numerals, and descriptions thereof are omitted. The power conversion device 6 in the present Reference Example 2 is obtained by integrating the current sensor device 1 in the above Reference Example 1 and the driving circuit 4 for driving the power conversion device 6 in the same unit. .

本参考例２における電力変換装置６は、モータ７を駆動時の負荷電流を電流センサ装置１により測定し、モータ制御を行うものであり、図６に示すように、モータ７を駆動するために必要な情報を電流センサ装置１から駆動用回路４に伝達する伝達手段５を有している。なお、電流センサ装置１を構成する電流センサ回路２及び記憶装置３は各々、駆動用回路４が実装された駆動用基板に搭載することもできるし、別のプリント基板に搭載しても良い。 The power conversion device 6 in this reference example 2 measures the load current at the time of driving the motor 7 by the current sensor device 1 and performs motor control. As shown in FIG. It has a transmission means 5 for transmitting necessary information from the current sensor device 1 to the driving circuit 4. Note that each of the current sensor circuit 2 and the storage device 3 constituting the current sensor device 1 can be mounted on a driving substrate on which the driving circuit 4 is mounted, or may be mounted on another printed circuit board.

次に、本参考例２における電力変換装置６の動作について、図７のフローチャートを用いて説明する。まず、ステップ１（Ｓ１）において、電力変換装置６の出力電圧値Ｖoを、電流センサ装置１の電流センサ回路２により測定する。次に、ステップ２（Ｓ２）では、記憶装置３に記憶された物理量変換係数Ｇを呼び出し、ステップ１で測定した出力電圧値Ｖoに対して出力値の補正を行う。 Next, operation | movement of the power converter device 6 in this reference example 2 is demonstrated using the flowchart of FIG. First, in step 1 (S1), the output voltage value Vo of the power converter 6 is measured by the current sensor circuit 2 of the current sensor device 1. Next, in step 2 (S2), the physical quantity conversion coefficient G stored in the storage device 3 is called, and the output value is corrected with respect to the output voltage value Vo measured in step 1.

物理量変換係数Ｇは、予め電流センサ回路２の調整時（初期特性測定時）において、所望の信号値Ｖo’、センサ信号値Ｖout、無磁界時のセンサ信号値Ｖoffから、以下の２式
によって求められる。
Ｇ＝Ｖo’／（Ｖout−Ｖoff) （２） ステップ３（Ｓ３）において、ステップ２で求められた物理量変換係数Ｇにより補正された補正済出力電圧Ｖ０’を出力する。 The physical quantity conversion coefficient G is obtained in advance by the following two formulas from the desired signal value Vo ′, sensor signal value Vout, and sensor signal value Voff when there is no magnetic field when the current sensor circuit 2 is adjusted (at the time of initial characteristic measurement). It is done.
G = Vo ′ / (Vout−Voff) (2) In step 3 (S3), the corrected output voltage V 0 ′ corrected by the physical quantity conversion coefficient G obtained in step 2 is output.

本参考例２によれば、電流センサ回路２により検出された出力電圧を、電流センサ回路２と同一のプリント基板上に配置された記憶装置３に記憶させた検出値補正情報により補正し、センサ出力信号の個体差を抑制することが可能な電流センサ装置１を備えることにより、低価格で精度の高い電力変換装置６が得られる。また、電流センサ装置１と電力変換装置６の駆動用回路４を一体化することにより、部品点数の低減及び装置の小型化が図られる。 According to this reference example 2 , the output voltage detected by the current sensor circuit 2 is corrected by the detection value correction information stored in the storage device 3 arranged on the same printed circuit board as the current sensor circuit 2, and the sensor By providing the current sensor device 1 capable of suppressing individual differences in output signals, the power converter 6 with high accuracy can be obtained at a low price. Further, by integrating the driving circuit 4 of the current sensor device 1 and the power conversion device 6, the number of parts can be reduced and the device can be downsized.

実施の形態１．
図８は、本発明の実施の形態１に係る電力変換装置の構成を示す概略図である。なお、図８中、図５と同一、相当部分には同一符号を付し、説明を省略する。本実施の形態１における電力変換装置９は、上記参考例１における電流センサ装置１と電力変換装置９を駆動するための駆動用回路４を、同一ユニットに配置することにより一体化し、さらに電流センサ回路２の周囲温度を測定する感温素子８を備えたものである。 Embodiment 1 FIG.
FIG. 8 is a schematic diagram showing the configuration of the power conversion device according to Embodiment 1 of the present invention. 8 that are the same as or equivalent to those in FIG. 5 are assigned the same reference numerals, and descriptions thereof are omitted. The power conversion device 9 in the first embodiment is integrated by disposing the current sensor device 1 in the reference example 1 and the driving circuit 4 for driving the power conversion device 9 in the same unit, and further, a current sensor. A temperature sensitive element 8 for measuring the ambient temperature of the circuit 2 is provided.

本実施の形態１における電力変換装置９は、モータ７を駆動時の負荷電流を電流センサ装置１により測定し、モータ制御を行うものであり、図９に示すように、モータ７を駆動するために必要な情報を、電流センサ装置１から駆動用回路４に伝達する伝達手段５を有している。なお、電流センサ装置１を構成する電流センサ回路２及び記憶装置３は各々、駆動用回路４が実装された駆動用回路基板に搭載することもできるし、別のプリント基板に搭載しても良い。 The power conversion device 9 according to the first embodiment measures the load current when the motor 7 is driven by the current sensor device 1 and performs motor control, and drives the motor 7 as shown in FIG. Transmission means 5 for transmitting necessary information from the current sensor device 1 to the driving circuit 4. The current sensor circuit 2 and the storage device 3 constituting the current sensor device 1 can be mounted on a driving circuit board on which the driving circuit 4 is mounted, or may be mounted on another printed circuit board. .

さらに、駆動用回路４が搭載された駆動用回路基板に感温素子８を配置し、物理量変換係数Ｇの温度特性を設定し、記憶装置３に記憶する。具体的には、周囲温度Ｔ1時のセン
サ信号値Ｖout1及び感温素子８の出力温度Ｔ11、周囲温度Ｔ2時のセンサ信号値Ｖout2及
び感温素子８の出力温度Ｔ22から、物理量変換係数Ｇの温度特性を設定する。また、感温素子８による出力温度を逐次観測することにより、物理量変換係数Ｇに逐次温度補正を行い、センサ出力信号の温度変動を抑制する。なお、感温素子８を搭載する位置は特に限定するものではなく、駆動用回路基板でなくてもよい。 Further, the temperature sensing element 8 is arranged on the driving circuit board on which the driving circuit 4 is mounted, and the temperature characteristic of the physical quantity conversion coefficient G is set and stored in the storage device 3. Specifically, from the sensor signal value Vout1 at the ambient temperature T1 and the output temperature T11 of the temperature sensing element 8, the sensor signal value Vout2 at the ambient temperature T2 and the output temperature T22 of the temperature sensing element 8, the temperature of the physical quantity conversion coefficient G. Set characteristics. In addition, by sequentially observing the output temperature from the temperature sensing element 8, the physical quantity conversion coefficient G is sequentially corrected to suppress temperature fluctuations in the sensor output signal. The position where the temperature sensitive element 8 is mounted is not particularly limited, and may not be a driving circuit board.

次に、本実施の形態１における電力変換装置９の動作について、図１０のフローチャートを用いて説明する。まず、ステップ１（Ｓ１）において、電力変換装置９の出力電圧値Ｖoを、電流センサ装置１の電流センサ回路２により測定する。次に、ステップ２（Ｓ２
）では、電流センサ回路２の周囲温度Ｔを感温素子８により測定する。 Next, operation | movement of the power converter device 9 in this Embodiment 1 is demonstrated using the flowchart of FIG. First, in step 1 (S1), the output voltage value Vo of the power conversion device 9 is measured by the current sensor circuit 2 of the current sensor device 1. Next, step 2 (S2
), The ambient temperature T of the current sensor circuit 2 is measured by the temperature sensing element 8.

続いてステップ３（Ｓ３）において、ステップ１で測定した出力電圧値Ｖoとステップ２で測定した周囲温度Ｔから、記憶装置３により温度補正された物理量変換係数Ｇを求める。物理量変換係数Ｇの求め方は上記参考例２と同様であり、本実施の形態１ではさらに、物理量変換係数Ｇに温度補正を行うものである。温度補正方法については後述する。さらに、ステップ４（Ｓ４）において、温度補正された物理量変換係数により補正された補正済出力電圧Ｖ０’を出力する。 Subsequently, in step 3 (S3), the physical quantity conversion coefficient G corrected in temperature by the storage device 3 is obtained from the output voltage value Vo measured in step 1 and the ambient temperature T measured in step 2. The method for obtaining the physical quantity conversion coefficient G is the same as that in the above-described Reference Example 2. In the first embodiment, the physical quantity conversion coefficient G is further subjected to temperature correction. The temperature correction method will be described later. Further, in step 4 (S4), the corrected output voltage V 0 ′ corrected by the physical quantity conversion coefficient corrected in temperature is output.

本実施の形態１における電力変換装置９の温度補正方法について、図１１〜図１３を用いて説明する。まず、図１１のフローチャートのステップ１（Ｓ１）において、電流センサ装置１が搭載されたプリント基板単体にて、磁気回路が無い状態で基準磁界発生装置によりゲインＧctmの温度特性αＭを求め、これを検出値補正情報として記憶装置３に書き
込む。ここでゲインとは、図１２に示すように、出力電圧Ｖout1、Ｖout2と電流値I1、I2から定義されるもので、単位はＡ／Ｖである。本実施の形態１では、ゲインＧct（Ａ／Ｖ）の温度特性αを求め、これにより温度補正を行うものである。 A temperature correction method for power conversion device 9 according to the first embodiment will be described with reference to FIGS. First, in step 1 (S1) of the flow chart of FIG. 11, the temperature characteristic αM of the gain Gctm is obtained by the reference magnetic field generator in the absence of a magnetic circuit on a single printed circuit board on which the current sensor device 1 is mounted. The detected value correction information is written in the storage device 3. Here, the gain is defined from the output voltages Vout1 and Vout2 and the current values I1 and I2 as shown in FIG. 12, and the unit is A / V. In the first embodiment, the temperature characteristic α of the gain Gct (A / V) is obtained and temperature correction is performed by this.

ステップ１におけるゲインＧctmの温度特性αＭの求め方について、図１３を用いて説
明する。図１３中、点線は、電流センサ回路２が搭載されたプリント基板単体にて磁気回路無しの状態で基準磁界発生装置より求めたゲインＧctmの温度特性αＭであり、感温素
子８により測定された周囲温度Ｔ1時のセンサ信号値Ｖout1及び電流値I1から算出された
ゲインＧctm(T1)と、周囲温度Ｔ2時のセンサ信号値Ｖout2及び電流値I2から算出されたゲインＧctm(T2)から、ゲインＧctmの温度特性αＭが得られる。 A method for obtaining the temperature characteristic αM of the gain Gctm in step 1 will be described with reference to FIG. In FIG. 13, the dotted line is the temperature characteristic αM of the gain Gctm obtained from the reference magnetic field generator in the state where the printed circuit board on which the current sensor circuit 2 is mounted and without the magnetic circuit, and was measured by the temperature sensing element 8. Gain Gctm (T1) calculated from sensor signal value Vout1 and current value I1 at ambient temperature T1 and gain Gctm (T2) calculated from sensor signal value Vout2 and current value I2 at ambient temperature T2 Is obtained.

次に、同プリント基板に電流センサ用磁気回路を付属した状態、すなわち総ＡＳＳＹ状態にて実通電を行い、基準温度ゲインＧct(Ｔ0)を求め、これを検出値補正情報として記
憶装置３に書き込む。なお、ここまでの動作は調整時に行われるもので、初期特性として必要であるが、通常動作時には不要である。 Next, actual energization is performed in the state where the magnetic circuit for the current sensor is attached to the same printed circuit board, that is, the total ASSY state, the reference temperature gain Gct (T0) is obtained, and this is written in the storage device 3 as detection value correction information. . The operation so far is performed at the time of adjustment and is necessary as an initial characteristic, but is not necessary at the time of normal operation.

次に、ステップ２（Ｓ２）では、上記ステップ１で求めた初期特性をもとに、基板基準
温度ゲインＧctｍ(Ｔ0)を求め、検出値補正情報として記憶装置３に書き込む。基板基準
温度ゲインＧctｍ(Ｔ0)は、基準温度ゲインのグラフ(図１３中点線で示す)を直線補間す
ることにより求められる。さらに、ステップ３（Ｓ３）において、同プリント基板に電流センサ用磁気回路を付属した状態におけるゲインＧctの温度特性αを求め、検出値補正情報として記憶装置３に書き込む。 Next, in step 2 (S2), the substrate reference temperature gain Gctm (T0) is obtained based on the initial characteristics obtained in step 1, and is written in the storage device 3 as detected value correction information. The substrate reference temperature gain Gctm (T0) is obtained by linearly interpolating a reference temperature gain graph (shown by a dotted line in FIG. 13). Further, in step 3 (S3), the temperature characteristic α of the gain Gct in a state where the current sensor magnetic circuit is attached to the same printed circuit board is obtained and written in the storage device 3 as detected value correction information.

以上のステップ１〜ステップ３において記憶装置３に書き込まれた検出値補正情報により、ステップ４（Ｓ４）において出力ゲインＧct(T)が算出される。ここで得られた出力
ゲインＧct(T)とは、各電流センサ回路２の個体差を含めた温度補正を行うものであり、
上記参考例２で求めた物理量変換係数Ｇの温度特性を含めたものと言える。 The output gain Gct (T) is calculated in step 4 (S4) based on the detection value correction information written in the storage device 3 in steps 1 to 3 described above. The output gain Gct (T) obtained here is for temperature correction including individual differences of each current sensor circuit 2.
It can be said that the temperature characteristic of the physical quantity conversion coefficient G obtained in Reference Example 2 is included.

例えばホール素子のような磁界-電圧変換素子の電流センサ回路２により得られるセン
サ信号値は、一般に下記の式１により補正される。式１においてＶ０’は補正済信号値、Ｖoutはセンサ信号値、Ｖoffは無磁界時のセンサ信号値、Ｇは物理量変換係数である。
Ｖ０’＝Ｇ×（Ｖout−Ｖoff） （１） For example, a sensor signal value obtained by a current sensor circuit 2 of a magnetic field-voltage conversion element such as a Hall element is generally corrected by the following equation 1. In Equation 1, V 0 ′ is a corrected signal value, Vout is a sensor signal value, Voff is a sensor signal value when there is no magnetic field, and G is a physical quantity conversion coefficient.
V 0 ′ = G × (Vout−Voff) (1)

ここで、本実施の形態１における温度補正方法により求めた出力ゲインＧct(T)を用い
、モータ制御を行うために電流センサ回路２からの電圧信号を電流値に変換すると、式１は式３のようになる。式３においてＩ’は補正済電流値である。
Ｉ’＝Ｇct(T)×（Ｖout−Ｖoff） （３） Here, when the output gain Gct (T) obtained by the temperature correction method in the first embodiment is used and the voltage signal from the current sensor circuit 2 is converted into a current value in order to perform motor control, the expression 1 becomes the expression 3 become that way. In Expression 3, I ′ is a corrected current value.
I ′ = Gct (T) × (Vout−Voff) (3)

なお、本実施の形態１による温度補正方法は、ホール素子に限らず、温度依存性に直線性がある素子であれば適用でき、温度補正による精度が補償される。例えばＭＲ素子やＧＭＲ素子等の磁気電圧変換素子を用いた場合にも適用可能である。 Note that the temperature correction method according to the first embodiment is not limited to the Hall element, but can be applied to any element having linearity in temperature dependence, and accuracy by temperature correction is compensated. For example, the present invention can be applied to a case where a magnetic voltage conversion element such as an MR element or a GMR element is used.

本実施の形態１に係る電力変換装置によれば、上記参考例２と同様の効果に加え、さらに、電流センサ回路２の周囲温度を測定する感温素子８を備えることにより、物理量変換係数Ｇの温度特性を設定するようにしたので、電流センサ回路２の温度特性に応じた温度補正を逐次行うことができ、電流センサ回路２の出力電圧の温度変動を抑制することができる。 According to the power conversion device according to the first embodiment, in addition to the same effects as those of the reference example 2, the physical quantity conversion coefficient G is further provided by including the temperature sensing element 8 that measures the ambient temperature of the current sensor circuit 2. Thus, the temperature correction according to the temperature characteristic of the current sensor circuit 2 can be sequentially performed, and the temperature fluctuation of the output voltage of the current sensor circuit 2 can be suppressed.

また、一般に、電力変換装置においては複数の電流センサ装置１が配置されるため、個々の電流センサ回路２に対する検出値補正情報を記憶した記憶装置３をそれぞれ配置することにより、複数の電流センサ装置１の個体差及び温度変動を抑制でき、高精度でモータ制御を行える電力変換装置が得られる。   In general, since a plurality of current sensor devices 1 are arranged in a power conversion device, a plurality of current sensor devices are arranged by arranging storage devices 3 each storing detection value correction information for each current sensor circuit 2. Thus, a power conversion device that can suppress individual differences and temperature fluctuations and can perform motor control with high accuracy is obtained.

本発明に係る電力変換装置は、例えばモータ駆動装置のモータ制御に利用することができる。 Engaging Ru power converting apparatus according to the present invention can be used, for example, the motor control of the motor driving device.

本発明の参考例１に係る電流センサ装置の構成を示す概略図である。It is the schematic which shows the structure of the current sensor apparatus which concerns on the reference example 1 of this invention. 本発明の参考例１に係る電流センサ装置の伝達手段を示す概略図である。It is the schematic which shows the transmission means of the current sensor apparatus which concerns on the reference example 1 of this invention. ホール素子を利用した一般的な電流センサ回路を示す図である。It is a figure which shows the general current sensor circuit using a Hall element. 本発明の参考例１の比較例であるトリミングによる調整方法を示す図である。It is a figure which shows the adjustment method by trimming which is a comparative example of the reference example 1 of this invention. 本発明の参考例２に係る電力変換装置の構成を示す概略図である。It is the schematic which shows the structure of the power converter device which concerns on the reference example 2 of this invention. 本発明の参考例２に係る電力変換装置の構成を示す概略図である。It is the schematic which shows the structure of the power converter device which concerns on the reference example 2 of this invention. 本発明の参考例２に係る電力変換装置の動作を示すフローチャート図である。It is a flowchart figure which shows operation | movement of the power converter device which concerns on the reference example 2 of this invention. 本発明の実施の形態１に係る電力変換装置の構成を示す概略図である。It is the schematic which shows the structure of the power converter device which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る電力変換装置の構成を示す概略図である。It is the schematic which shows the structure of the power converter device which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る電力変換装置の動作を示すフローチャート図である。It is a flowchart figure which shows operation | movement of the power converter device which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る電力変換装置の温度補正方法を示すフローチャート図である。It is a flowchart figure which shows the temperature correction method of the power converter device which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る電力変換装置におけるゲインの定義を示す図である。It is a figure which shows the definition of the gain in the power converter device which concerns on Embodiment 1 of this invention. 本発明の実施の形態１に係る電力変換装置におけるゲインの温度特性α、αＭの定義を示す図である。It is a figure which shows the definition of the temperature characteristics (alpha) and (alpha) M of the gain in the power converter device which concerns on Embodiment 1 of this invention.

１ 電流センサ装置、２ 電流センサ回路、３ 記憶装置、４ 駆動用回路、５ 伝達手段、６、９ 電力変換装置、７ モータ、８ 感温素子、１１ ＯＰアンプ、１２ ホール素子。   DESCRIPTION OF SYMBOLS 1 Current sensor apparatus, 2 Current sensor circuit, 3 Memory | storage device, 4 Drive circuit, 5 Transmission means, 6, 9 Power converter, 7 Motor, 8 Temperature sensing element, 11 OP amplifier, 12 Hall element.

Claims (2)

モータ駆動時の電流を電流センサ装置により測定しモータ制御を行う電力変換装置あって、前記電流センサ装置は、被測定電流により発生する磁界の値に応じて変化する信号を出力し、この出力信号を出力電圧に変換する電流センサ回路と、前記電流センサ回路の出力電圧を補正するための検出値補正情報を記憶する記憶手段と、前記電流センサ回路の周囲温度を測定する感温素子を備え、前記検出値補正情報は、前記電流センサ回路からの出力電圧情報と、前記感温素子からの周囲温度情報と、前記電流センサ回路の調整時において磁気回路が無い状態で基準磁界発生装置により求めたゲインとその時の前記周囲温度情報から得られるゲインの温度特性情報と、前記電流センサ回路の調整時において磁気回路を付属した状態で求めた基準温度ゲイン情報と、前記基準温度ゲイン情報から求められる基板基準温度ゲイン情報と、前記ゲインの温度特性情報に基づき求められる前記基板に前記磁気回路を付属した状態におけるゲインの温度特性情報αを含み、前記基準温度ゲイン情報と前記ゲインの温度特性情報αから得られるグラフより出力ゲインを算出し、下式により前記電流センサ回路の出力電圧を温度補正した補正済電流値を得ることを特徴とする電力変換装置。
Ｉ’＝Ｇct(T)×（Ｖout−Ｖoff）
Ｉ’は補正済電流値、Ｇct(T)は出力ゲイン、Ｖoutはセンサ信号値、Ｖoffは無磁界時のセンサ信号値。 A power conversion device that controls a motor by measuring a current when a motor is driven by a current sensor device, wherein the current sensor device outputs a signal that changes according to a value of a magnetic field generated by a current to be measured, and outputs the signal. A current sensor circuit for converting the output voltage of the current sensor circuit, storage means for storing detection value correction information for correcting the output voltage of the current sensor circuit, and a temperature sensing element for measuring the ambient temperature of the current sensor circuit, The detected value correction information was obtained by a reference magnetic field generator in the absence of a magnetic circuit during adjustment of the current sensor circuit, output voltage information from the current sensor circuit, ambient temperature information from the temperature sensing element, and adjustment of the current sensor circuit. gain and the temperature characteristic information of the gain obtained from the ambient temperature information at that time, the reference temperature obtained in a state that came magnetic circuit at the time of adjustment of the current sensor circuit Wherein the gain information, and a substrate reference temperature gain information obtained from the reference temperature gain information, a temperature characteristic information of the gain α at the accessory state the magnetic circuit on the substrate to be determined based on the temperature characteristic information of the gain, the Power conversion characterized in that an output gain is calculated from a graph obtained from reference temperature gain information and temperature characteristic information α of the gain, and a corrected current value obtained by temperature-correcting the output voltage of the current sensor circuit is obtained by the following equation: apparatus.
I ′ = Gct (T) × (Vout−Voff)
I ′ is the corrected current value, Gct (T) is the output gain, Vout is the sensor signal value, and Voff is the sensor signal value when there is no magnetic field. 被測定電流により発生する磁界の値に応じて変化する信号を検出し、この出力信号を出
力電圧に変換する電流センサ回路と、前記電流センサ回路の出力電圧を補正するための検
出値補正情報を記憶する記憶手段と、前記電流センサ回路の周囲温度を測定する感温素子を有する電流センサ装置の温度補正方法であって、
前記電流センサ回路の調整時において、前記電流センサ回路が搭載された基板単体にて、磁気回路が無い状態で基準磁界発生装置より求めたゲインとその時の周囲温度からゲインの温度特性情報を求め、続いて前記基板に磁気回路を付属した状態にて通電を行うことにより基準温度ゲイン情報を求め、これらを前記検出値補正情報として前記記憶手段に書き込む第１のステップ、
前記第１のステップで求めた前記基準温度ゲイン情報のグラフを直線補間することにより基板基準温度ゲイン情報を求め、前記検出値補正情報として前記記憶手段に書き込む第２のステップ、
前記第１のステップで求めたゲインの温度特性情報に基づき前記基板に前記磁気回路を付属した状態におけるゲインの温度特性情報αを求め、前記検出値補正情報として前記記憶手段に書き込む第３のステップ、
前記記憶手段に書き込まれた前記基準温度ゲイン情報と前記ゲインの温度特性情報αから得られるグラフより出力ゲインを算出し、下式により前記電流センサ回路の出力電圧を温度補正した補正済電流値を得る第４のステップを含むことを特徴とする電流センサ装置の温度補正方法。
Ｉ’＝Ｇct(T)×（Ｖout−Ｖoff）
Ｉ’は補正済電流値、Ｇct(T)は出力ゲイン、Ｖoutはセンサ信号値、Ｖoffは無磁界時のセンサ信号値。 A current sensor circuit that detects a signal that changes in accordance with the value of the magnetic field generated by the current to be measured, converts the output signal into an output voltage, and detection value correction information for correcting the output voltage of the current sensor circuit. A temperature correction method for a current sensor device having storage means for storing and a temperature sensing element for measuring the ambient temperature of the current sensor circuit ,
When adjusting the current sensor circuit, obtain the temperature characteristic information of the gain from the gain obtained from the reference magnetic field generator and the ambient temperature at that time in a state where there is no magnetic circuit on a single substrate on which the current sensor circuit is mounted , Subsequently, a first step of obtaining reference temperature gain information by energizing the substrate with a magnetic circuit attached thereto, and writing these into the storage means as the detection value correction information,
A second step of obtaining substrate reference temperature gain information by linearly interpolating the graph of the reference temperature gain information obtained in the first step, and writing it into the storage means as the detection value correction information;
A gain temperature characteristic information α in a state where the magnetic circuit is attached to the substrate on the basis of the gain temperature characteristic information obtained in the first step, and writing to the storage means as the detection value correction information. ,
An output gain is calculated from a graph obtained from the reference temperature gain information written in the storage means and the temperature characteristic information α of the gain, and a corrected current value obtained by temperature-correcting the output voltage of the current sensor circuit by the following equation is obtained. A temperature correction method for a current sensor device, comprising: obtaining a fourth step.
I ′ = Gct (T) × (Vout−Voff)
I ′ is the corrected current value, Gct (T) is the output gain, Vout is the sensor signal value, and Voff is the sensor signal value when there is no magnetic field.
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