JP2014211392A - Voltage detector - Google Patents
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
Abstract
Description
本発明は、電圧検出装置に関する。 The present invention relates to a voltage detection device.
下記特許文献１には、内部の電子回路を静電気から保護する電池システムが開示されている。この電池システムは、複数の電池セルが直列に接続された複数のセルグループからなるバッテリと、セルグループ毎に設けられ、セルグループの各電池セルの両電極に接続され、各電池セルの電圧を検出する集積回路と、集積回路から入力される検出信号に基づいて集積回路を制御するバッテリコントローラと、集積回路を搭載する基板を収納するケースと、各電池セルに並列に接続されるノイズ対策用コンデンサと、各電池セルの正極と集積回路との間に設けられた抵抗器と、各電池セルと集積回路とを接続する全ての信号線をグランドに接続する静電気対策用コンデンサとを備え、上記信号線に侵入した静電気を、静電気対策用コンデンサを介してグランドに放出する。 Patent Document 1 listed below discloses a battery system that protects an internal electronic circuit from static electricity. This battery system includes a battery composed of a plurality of cell groups in which a plurality of battery cells are connected in series, and is provided for each cell group, and is connected to both electrodes of each battery cell of the cell group. Integrated circuit for detection, battery controller for controlling the integrated circuit based on a detection signal input from the integrated circuit, a case for storing a substrate on which the integrated circuit is mounted, and noise countermeasures connected in parallel to each battery cell A capacitor, a resistor provided between the positive electrode of each battery cell and the integrated circuit, and an anti-static capacitor that connects all signal lines connecting each battery cell and the integrated circuit to the ground. Static electricity that has entered the signal line is discharged to the ground via a static electricity prevention capacitor.
ところで、上記従来技術では、電池セルの電圧を検出する際に、該電圧に含まれるノイズを除去するために抵抗器及びコンデンサからなるフィルタ回路を用いているが、該フィルタ回路の時定数が小さい場合、電圧に含まれるノイズを効果的に除去できない。その対策として、例えばコンデンサを増やして、フィルタ回路の時定数を調整することも考えられるが、その場合、部品点数が増えてしまうという問題が発生する。 By the way, in the above prior art, when detecting the voltage of the battery cell, a filter circuit composed of a resistor and a capacitor is used to remove noise contained in the voltage, but the time constant of the filter circuit is small. In this case, noise included in the voltage cannot be effectively removed. As a countermeasure, for example, it is conceivable to increase the number of capacitors and adjust the time constant of the filter circuit. However, in this case, there is a problem that the number of parts increases.
本発明は、上述した事情に鑑みてなされたものであり、部品点数を増やすことなく、電圧に含まれるノイズを効果的に除去することを目的とする。 The present invention has been made in view of the above-described circumstances, and an object thereof is to effectively remove noise included in a voltage without increasing the number of parts.
上記目的を達成するために、本発明では、バッテリを構成する複数の電池セル各々の電圧を検出し、該電圧を示す検出信号を出力する電圧検出回路と、前記検出信号を所定の間隔でサンプリングして電圧値を取得する電圧値取得手段とを具備する電圧検出装置であって、前記電圧値取得手段は、前記検出信号から取得した電圧値にノイズが含まれるか否か判定し、電圧値にノイズが含まれると判定した場合には、ノイズが含まれる前の所定回数分の移動平均を算出し、ノイズが含まれると判定した電圧値を移動平均値で置き換える、という手段を採用する。 In order to achieve the above object, in the present invention, a voltage detection circuit that detects the voltage of each of a plurality of battery cells constituting a battery and outputs a detection signal indicating the voltage, and samples the detection signal at a predetermined interval. Voltage value acquisition means for acquiring a voltage value, wherein the voltage value acquisition means determines whether or not noise is included in the voltage value acquired from the detection signal, and the voltage value If it is determined that noise is included, a moving average is calculated for a predetermined number of times before the noise is included, and a voltage value determined to include noise is replaced with a moving average value.
本発明では、第２の解決手段として、上記第１の解決手段において、前記電圧値取得手段は、前記検出信号から取得した電圧値が所定の閾値を上回る場合には、電圧値にノイズが含まれていると判定する、という手段を採用する。 In the present invention, as the second solution means, in the first solution means, the voltage value acquisition means includes noise in the voltage value when the voltage value acquired from the detection signal exceeds a predetermined threshold value. Adopting a means to determine that the
本発明では、第３の解決手段として、上記第２の解決手段において、前記電圧値取得手段は、前記検出信号から取得した電圧値が所定の閾値を上回り、かつ該電圧値の前後の値が前記所定の閾値を下回る場合には、電圧値にノイズが含まれていると判定する、という手段を採用する。 In the present invention, as a third solving means, in the second solving means, the voltage value acquiring means has a voltage value acquired from the detection signal exceeding a predetermined threshold value, and values before and after the voltage value are If it falls below the predetermined threshold, a means is adopted in which it is determined that the voltage value includes noise.
本発明では、第４の解決手段として、上記第２または第３の解決手段において、前記バッテリと前記電圧検出回路との間に設けられ、前記バッテリの前記電池セルから入力される電圧に含まれるノイズを除去し、該電圧を前記電圧検出回路に出力するフィルタ回路をさらに具備する電圧検出装置であって、前記所定の閾値として、前記バッテリの前記電池セルの特性、前記フィルタ回路の特性及び前記電圧値取得手段のサンプリング周期に基づいて推定された１つのサンプル間で発生しうる電圧値の変動よりも大きな値が設定されている、という手段を採用する。 In the present invention, as a fourth solution, in the second or third solution, the voltage is provided between the battery and the voltage detection circuit, and is included in the voltage input from the battery cell of the battery. A voltage detection apparatus further comprising a filter circuit that removes noise and outputs the voltage to the voltage detection circuit, wherein the predetermined threshold value includes the battery cell characteristics, the filter circuit characteristics, and the A means is adopted in which a value larger than the fluctuation in voltage value that can occur between one sample estimated based on the sampling period of the voltage value acquisition means is set.
本発明では、第５の解決手段として、上記第１〜第４のいずれか１つの解決手段において、前記所定回数分は、３２あるいは６４回分である、という手段を採用する。 In the present invention, as the fifth solving means, in the first to fourth solving means, the predetermined number of times is 32 or 64 times.
本発明では、第６の解決手段として、上記第１〜第３のいずれか１つの解決手段において、前記所定回数分は、０．４４３とサンプリング周期とを乗算した値をカットオフ周期で除算した値分である、という手段を採用する。 In the present invention, as a sixth solving means, in any one of the first to third solving means, a value obtained by multiplying 0.443 and a sampling period is divided by a cutoff period for the predetermined number of times. Adopting the means of value.
本発明によれば、電圧値取得手段が、電圧検出回路から入力される検出信号から取得した電圧値にノイズが含まれるか否か判定し、電圧値にノイズが含まれると判定した場合には、ノイズが含まれる前の所定回数分の移動平均を算出し、ノイズが含まれると判定した電圧値を移動平均値で置き換えることによって、部品点数を増やすことなく、電圧に含まれるノイズを効果的に除去することができる。 According to the present invention, when the voltage value acquisition means determines whether or not the voltage value acquired from the detection signal input from the voltage detection circuit includes noise, and determines that the voltage value includes noise. By calculating the moving average for a predetermined number of times before noise is included and replacing the voltage value determined to contain noise with the moving average value, the noise included in the voltage can be effectively reduced without increasing the number of parts. Can be removed.
以下、図面を参照して、本発明の実施形態について説明する。
本実施形態に係る電圧検出装置Ａは、電気自動車（ＥＶ：Electric Vehicle）あるいはハイブリッド自動車（ＨＶ：Hybrid Vehicle）等の移動車両に搭載され、バッテリＢを構成する各電池セルＣ１〜Ｃｎの電圧状態を監視するものである。このような電圧検出装置Ａは、図１に示すように、放電回路Ｈ１〜Ｈｎ、フィルタ回路Ｆ１〜Ｆｎ、電圧検出回路Ｄ及びマイコンＭ（電圧値取得手段）を備える。なお、電圧検出回路Ｄ及びマイコンＭは、本実施形態における電圧検出手段を構成する。
Embodiments of the present invention will be described below with reference to the drawings.
The voltage detection apparatus A according to the present embodiment is mounted on a moving vehicle such as an electric vehicle (EV) or a hybrid vehicle (HV), and voltage states of the battery cells C1 to Cn constituting the battery B. Is to monitor. As shown in FIG. 1, such a voltage detection device A includes discharge circuits H1 to Hn, filter circuits F1 to Fn, a voltage detection circuit D, and a microcomputer M (voltage value acquisition means). Note that the voltage detection circuit D and the microcomputer M constitute voltage detection means in the present embodiment.
放電回路Ｈ１〜Ｈｎは、各電池セルＣ１〜Ｃｎに並列に接続され、過充電状態である電池セルＣ１〜ＣｎをマイコンＭから入力される制御信号に基づいて放電させるものである。このような放電回路Ｈ１〜Ｈｎは、図１に示すように、スイッチング素子Ｓ１〜Ｓｎ及び第１の抵抗器Ｒａ１〜Ｒａｎから構成されている。なお、放電回路Ｈ１〜Ｈｎは同じ構成であるので、放電回路Ｈ１のスイッチング素子Ｓ１及び抵抗器Ｒ１についてのみ説明し、放電回路Ｈ２〜Ｈｎについては説明を省略する。 The discharge circuits H1 to Hn are connected in parallel to the battery cells C1 to Cn, and discharge the battery cells C1 to Cn in an overcharged state based on a control signal input from the microcomputer M. As shown in FIG. 1, such discharge circuits H1 to Hn are composed of switching elements S1 to Sn and first resistors Ra1 to Ran. Since the discharge circuits H1 to Hn have the same configuration, only the switching element S1 and the resistor R1 of the discharge circuit H1 will be described, and the description of the discharge circuits H2 to Hn will be omitted.
スイッチング素子Ｓ１は、例えば、バイポーラトランジスタであり、ベース端子がマイコンＭに接続され、エミッタ端子が電池セルＣ１の正極に接続され、コレクタ端子が第１の抵抗器Ｒａ１の一端に接続されている。このようなスイッチング素子Ｓ１は、マイコンＭから電圧値がハイレベルである制御信号がベース端子に入力されるとオン状態となって、過充電状態である電池セルＣ１の電力を第１の抵抗器Ｒａ１に放電する。一方、スイッチング素子Ｓ１は、電圧値がローレベルである制御信号がベース端子に入力されないと、オフ状態となって、電池セルＣ１から第１の抵抗器Ｒａ１への放電を停止する。 The switching element S1 is, for example, a bipolar transistor, the base terminal is connected to the microcomputer M, the emitter terminal is connected to the positive electrode of the battery cell C1, and the collector terminal is connected to one end of the first resistor Ra1. The switching element S1 is turned on when a control signal having a high voltage value is input from the microcomputer M to the base terminal, and the power of the battery cell C1 in the overcharged state is supplied to the first resistor. Discharge to Ra1. On the other hand, when a control signal having a low voltage value is not input to the base terminal, the switching element S1 is turned off and stops discharging from the battery cell C1 to the first resistor Ra1.
また、スイッチング素子Ｓ１は、バイポーラトランジスタ以外にも、例えばＦＥＴトランジスタ（Field Effect Transistor：電界効果トランジスタ）やＩＧＢＴ（Insulated Gate Bipolar Transistor：絶縁ゲートバイポーラトランジスタ）であってもよい。 In addition to the bipolar transistor, the switching element S1 may be, for example, an FET transistor (Field Effect Transistor) or an IGBT (Insulated Gate Bipolar Transistor).
第１の抵抗器Ｒａ１は、一端がスイッチング素子Ｓ１のコレクタ端子に接続され、他端が電池セルＣ１の負極に接続されている。このような第１の抵抗器Ｒａ１は、スイッチング素子Ｓ１がオン状態となると、電池セルＣ１から電力が入力され、該電力を熱エネルギーに変換する、つまり発熱する。 One end of the first resistor Ra1 is connected to the collector terminal of the switching element S1, and the other end is connected to the negative electrode of the battery cell C1. When the switching element S1 is turned on, such first resistor Ra1 receives power from the battery cell C1 and converts the power into heat energy, that is, generates heat.
フィルタ回路Ｆ１〜Ｆｎは、各電池セルＣ１〜Ｃｎから出力される電圧に含まれるノイズを除去するローパスフィルタ回路であり、各電池セルＣ１〜Ｃｎと電圧検出回路Ｄとの間に各々設けられている。このようなフィルタ回路Ｆ１〜Ｆｎは、図１に示すように、第２の抵抗器Ｒｂ１〜Ｒｂｎ及びコンデンサＣｄ１〜Ｃｄｎから構成されている。 The filter circuits F1 to Fn are low-pass filter circuits that remove noise included in the voltages output from the battery cells C1 to Cn, and are provided between the battery cells C1 to Cn and the voltage detection circuit D, respectively. Yes. Such filter circuits F1 to Fn are composed of second resistors Rb1 to Rbn and capacitors Cd1 to Cdn, as shown in FIG.
なお、フィルタ回路Ｆ１〜Ｆｎは同じ構成であるので、フィルタ回路Ｆ１の第２の抵抗器Ｒｂ１及びコンデンサＣｄ１についてのみ説明し、フィルタ回路Ｆ２〜Ｆｎについては説明を省略する。 Since the filter circuits F1 to Fn have the same configuration, only the second resistor Rb1 and the capacitor Cd1 of the filter circuit F1 will be described, and the description of the filter circuits F2 to Fn will be omitted.
第２の抵抗器Ｒｂ１は、一端がスイッチング素子Ｓ１のエミッタ端子及び電池セルＣ１の正極に接続され、他端がコンデンサＣｄ１の一端及び電圧検出回路Ｄに設けられた複数の内の１つの入力端子に接続されている。
コンデンサＣｄ１は、一端が第２の抵抗器Ｒｂ１の他端及び電圧検出回路Ｄの１つの入力端子に接続され、他端がグランドに接続されている。
The second resistor Rb1 has one end connected to the emitter terminal of the switching element S1 and the positive electrode of the battery cell C1, and the other end connected to one end of the capacitor Cd1 and one input terminal of the voltage detection circuit D. It is connected to the.
The capacitor Cd1 has one end connected to the other end of the second resistor Rb1 and one input terminal of the voltage detection circuit D, and the other end connected to the ground.
電圧検出回路Ｄは、各電池セルＣ１〜Ｃｎの電圧を検出し、その検出結果をデジタルデータである電圧検出データ（検出信号）に変換するＡ／Ｄ変換機能やマイコンＭとの通信機能を有する専用のＩＣチップである。このような電圧検出回路Ｄは、高電圧（例えば６０Ｖ）の電力によって稼働可能であり、低電圧（例えば１２Ｖ）で稼動可能なマイコンＭとフォトカプラ等の絶縁素子を介して接続されることによって、マイコンＭと電気的に絶縁されると共に通信可能に接続される。 The voltage detection circuit D has an A / D conversion function that detects the voltage of each of the battery cells C1 to Cn and converts the detection result into voltage detection data (detection signal) that is digital data, and a communication function with the microcomputer M. It is a dedicated IC chip. Such a voltage detection circuit D can be operated with electric power of a high voltage (for example, 60V), and is connected to the microcomputer M operable with a low voltage (for example, 12V) via an insulating element such as a photocoupler. Are electrically insulated from the microcomputer M and are communicably connected.
マイコンＭは、ＣＰＵ（Central Processing Unit）、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）及び電気的に相互接続された各部と各種信号の送受信を行うインターフェイス回路等から構成されたＩＣチップであり、上述した絶縁素子を介して電圧検出回路Ｄと通信可能に接続されている。 The microcomputer M is an IC chip composed of a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and an interface circuit that transmits and receives various signals to / from each electrically connected part. Yes, and connected to the voltage detection circuit D via the above-described insulating element.
このマイコンＭは、上記ＲＯＭに記憶された各種演算制御プログラムに基づいて各種の演算処理を行うと共に各部と通信を行うことにより電圧検出装置Ａの全体動作を制御する。詳細については後述するが、上述したフィルタ回路Ｆ１〜Ｆｎによって除去できなかった電圧値に含まれるノイズを除去する。 The microcomputer M controls various operations of the voltage detection device A by performing various arithmetic processes based on various arithmetic control programs stored in the ROM and communicating with each unit. Although details will be described later, noise included in the voltage value that could not be removed by the above-described filter circuits F1 to Fn is removed.
次に、このように構成された本電圧検出装置Ａの動作について図２及び図３を参照して説明する。
マイコンＭは、電圧検出回路Ｄから入力される電圧検出データ（検出信号）を所定の間隔でサンプリングして各電池セルＣ１〜Ｃｎの電圧値を取得する。つまり、マイコンＭは、電圧検出回路Ｄから入力される電圧検出データから予め割り当てられたタイミングで各電池セルＣ１〜Ｃｎの電圧値を取得する。そして、マイコンＭは、取得した各電池セルＣ１〜Ｃｎの電圧値に基づいて電圧検出装置Ａの全体動作を制御する。
Next, the operation of the voltage detection apparatus A configured as described above will be described with reference to FIGS.
The microcomputer M samples the voltage detection data (detection signal) input from the voltage detection circuit D at a predetermined interval, and acquires the voltage values of the battery cells C1 to Cn. That is, the microcomputer M acquires the voltage value of each of the battery cells C1 to Cn from the voltage detection data input from the voltage detection circuit D at a timing assigned in advance. And the microcomputer M controls the whole operation | movement of the voltage detection apparatus A based on the acquired voltage value of each battery cell C1-Cn.
ここで、マイコンＭは、フィルタ回路Ｆ１〜Ｆｎによって除去できなかった電圧値に含まれるノイズを除去するために、以下の特徴的な処理を実行する。まず、マイコンＭは、予め割り当てられたタイミングで電圧検出データから電圧値を取得し、該電圧値が所定の閾値を上回るか否か判定する（ステップＳ１）。マイコンＭは、電圧値が所定の閾値を下回る場合（ＮＯの場合）、通常の処理を実行する（ステップＳ２）。つまり、マイコンＭは、電圧値が所定の閾値を下回る場合には、電圧値にノイズが含まれていないとして、通常通りの処理を行う。 Here, the microcomputer M executes the following characteristic processing in order to remove noise included in the voltage values that could not be removed by the filter circuits F1 to Fn. First, the microcomputer M acquires a voltage value from the voltage detection data at a timing assigned in advance, and determines whether or not the voltage value exceeds a predetermined threshold (step S1). The microcomputer M executes normal processing when the voltage value falls below a predetermined threshold (in the case of NO) (step S2). That is, when the voltage value is lower than the predetermined threshold, the microcomputer M performs normal processing by assuming that the voltage value does not include noise.
一方、マイコンＭは、上記電圧値が所定の閾値を上回る場合（ＹＥＳの場合）、該電圧値の前後の値が所定の閾値を下回るか否か判定する（ステップＳ３）。マイコンＭは、上記電圧値の前後の値が所定の閾値を下回る場合（ＹＥＳの場合）、該電圧値の前の所定回数分の移動平均を算出し、該電圧値を移動平均値で置き換える（ステップＳ４）。 On the other hand, when the voltage value exceeds the predetermined threshold value (in the case of YES), the microcomputer M determines whether the values before and after the voltage value are lower than the predetermined threshold value (step S3). When the value before and after the voltage value falls below a predetermined threshold value (in the case of YES), the microcomputer M calculates a moving average for a predetermined number of times before the voltage value, and replaces the voltage value with the moving average value ( Step S4).
つまり、マイコンＭは、電圧検出データから取得した電圧値が所定の閾値を上回り、かつ該電圧値の前後の値が所定の閾値を下回る場合には、上記電圧値にノイズが含まれているとして、該電圧値の前の所定回数分の移動平均を算出し、該電圧値を移動平均値で置き換える。 That is, when the voltage value acquired from the voltage detection data exceeds the predetermined threshold value and the values before and after the voltage value are lower than the predetermined threshold value, the microcomputer M determines that the voltage value includes noise. The moving average for a predetermined number of times before the voltage value is calculated, and the voltage value is replaced with the moving average value.
例えば、マイコンＭは、予め割り当てられたタイミングで電圧検出データから図３に示す電圧値Ｖ１を取得し、電圧値Ｖ１が所定の閾値（例えば、図３に示す１００ｍＶ）を上回り、かつ該電圧値Ｖ１の前後の値である図３に示す電圧値Ｖ０と電圧値Ｖ２とが所定の閾値を下回ると、電圧値Ｖ１にノイズが含まれているとして、電圧値Ｖ１の前の所定回数分（例えば、図３に示すＶ０〜Ｖ−Ｍ）の移動平均Ｖｘ（図３参照）を算出し、該電圧値Ｖ１を移動平均Ｖｘで置き換える。 For example, the microcomputer M acquires the voltage value V 1 shown in FIG. 3 from the voltage detection data at a pre-assigned timing, the voltage value V 1 exceeds a predetermined threshold (for example, 100 mV shown in FIG. 3), and the When the voltage value V 0 and the voltage value V 2 shown in FIG. 3 is a longitudinal value of the voltage value V 1 falls below a predetermined threshold value, as there is noise in the voltage value V 1, the voltage value V 1 The moving average V x (see FIG. 3) of the previous predetermined number of times (for example, V 0 to V −M shown in FIG. 3) is calculated, and the voltage value V 1 is replaced with the moving average V x .
また、上記所定の閾値として、バッテリＢの電池セルＣ１〜Ｃｎの特性、フィルタ回路Ｆ１〜Ｆｎの特性及びマイコンＭのサンプリング周期に基づいて推定された１つのサンプル間で発生しうる電圧値の変動よりも大きな値を設定している。また、移動平均を算出する際の上記所定回数分を、３２あるいは６４回分にして、処理負荷を軽減するようにしてもよい。 Further, as the predetermined threshold value, the fluctuation of the voltage value that can occur between one sample estimated based on the characteristics of the battery cells C1 to Cn of the battery B, the characteristics of the filter circuits F1 to Fn, and the sampling period of the microcomputer M. A larger value is set. Further, the predetermined number of times when calculating the moving average may be 32 or 64 times to reduce the processing load.
このようにして、ノイズを含む電圧値Ｖ１をノイズを含まない近似値に補正できる。そして、マイコンＭは、このように補正した各電池セルＣ１〜Ｃｎの電圧値に基づいて電圧検出装置Ａの全体動作を制御する。 In this way, it corrects the voltage value V 1 containing noise approximation without the noise. And the microcomputer M controls the whole operation | movement of the voltage detection apparatus A based on the voltage value of each battery cell C1-Cn correct | amended in this way.
一方、マイコンＭは、上記電圧値の前後の値が所定の閾値を上回る場合（ＮＯの場合）、電圧検出回路Ｄに異常が発生していると判断する（ステップＳ５）。 On the other hand, when the values before and after the voltage value exceed a predetermined threshold value (in the case of NO), the microcomputer M determines that an abnormality has occurred in the voltage detection circuit D (step S5).
このような本実施形態によれば、マイコンＭは、電圧検出回路Ｄから入力される電圧検出データから取得した電圧値にノイズが含まれるか否か判定し、電圧値にノイズが含まれると判定した場合には、ノイズが含まれる前の所定回数分の移動平均を算出し、ノイズが含まれると判定した電圧値を移動平均値で置き換えることによって、部品点数を増やすことなく、電圧に含まれるノイズを効果的に除去することができる。 According to the present embodiment, the microcomputer M determines whether or not the voltage value acquired from the voltage detection data input from the voltage detection circuit D includes noise, and determines that the voltage value includes noise. In this case, the moving average is calculated for a predetermined number of times before the noise is included, and the voltage value determined to include the noise is replaced with the moving average value, thereby being included in the voltage without increasing the number of parts. Noise can be effectively removed.
以上、本発明の実施形態について説明したが、本発明は上記実施形態に限定されることなく、例えば以下のような変形が考えられる。
（１）上記実施形態において、マイコンＭは、電圧検出回路Ｄから入力される電圧検出データから取得した電圧値が所定の閾値を上回り、かつ該電圧値の前後の値が所定の閾値を下回る場合に、電圧値にノイズが含まれているとして、電圧値の前の所定回数分の移動平均を算出し、該電圧値を移動平均値で置き換えたが、本発明はこれに限定されない。例えば、マイコンＭは、電圧検出回路Ｄから入力される電圧検出データから取得した電圧値が所定の閾値を上回る場合には、電圧値にノイズが含まれているとして、電圧値の前の所定回数分の移動平均を算出し、該電圧値を移動平均値で置き換えるようにしてもよい。
As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the microcomputer M has a case where the voltage value acquired from the voltage detection data input from the voltage detection circuit D exceeds a predetermined threshold value, and values before and after the voltage value are lower than the predetermined threshold value. In addition, assuming that noise is included in the voltage value, a moving average for a predetermined number of times before the voltage value is calculated and replaced with the moving average value, but the present invention is not limited to this. For example, if the voltage value acquired from the voltage detection data input from the voltage detection circuit D exceeds a predetermined threshold value, the microcomputer M determines that the voltage value includes noise and the predetermined number of times before the voltage value. A moving average of minutes may be calculated, and the voltage value may be replaced with a moving average value.
（２）上記実施形態では、処理負荷を軽減するために、移動平均を算出する際の上記所定回数分を、３２あるいは６４回分にしたが、本発明はこれに限定されない。例えば、上記所定回数分を、０．４４３とマイコンＭのサンプリング周波数ｆｓとを乗算した値をカットオフ周波数ｆｃで除算した値（つまり「０．４４３×ｆｓ/ｆｃ」）分にしてもよい。 (2) In the above embodiment, in order to reduce the processing load, the predetermined number of times when calculating the moving average is 32 or 64 times, but the present invention is not limited to this. For example, the predetermined number of times may be a value obtained by dividing 0.443 and the sampling frequency fs of the microcomputer M by the cutoff frequency fc (that is, “0.443 × fs / fc”).
（３）上記実施形態は、フィルタ回路Ｆ１〜Ｆｎによって電圧値からノイズを除去できなかった場合に、該電圧値を補正するものであるが、本発明はこれに限定されない。例えば、フィルタ回路Ｆ１〜Ｆｎを具備しない電圧検出装置に、本発明を適用するようにしてもよい。つまり、マイコンＭの処理のみによって、電圧値に含まれるノイズを除去するようにしてもよい。 (3) Although the above embodiment corrects the voltage value when noise cannot be removed from the voltage value by the filter circuits F1 to Fn, the present invention is not limited to this. For example, the present invention may be applied to a voltage detection device that does not include the filter circuits F1 to Fn. That is, noise included in the voltage value may be removed only by the processing of the microcomputer M.
Ａ…電圧検出装置、Ｂ…バッテリ、Ｃ１〜Ｃｎ…電池セル、Ｈ１〜Ｈｎ…放電回路、Ｆ１〜Ｆｎ…フィルタ回路、Ｄ…電圧検出回路、Ｍ…マイコン（電圧値取得手段）、Ｓ１〜Ｓｎ…スイッチング素子、Ｒａ１〜Ｒａｎ…第１の抵抗器、Ｒｂ１〜Ｒｂｎ…第２の抵抗器、Ｃｄ１〜Ｃｄｎ…コンデンサ A ... Voltage detection device, B ... Battery, C1-Cn ... Battery cell, H1-Hn ... Discharge circuit, F1-Fn ... Filter circuit, D ... Voltage detection circuit, M ... Microcomputer (voltage value acquisition means), S1-Sn ... switching elements, Ra1 to Ran ... first resistors, Rb1 to Rbn ... second resistors, Cd1 to Cdn ... capacitors
Claims (6)
前記電圧値取得手段は、前記検出信号から取得した電圧値にノイズが含まれるか否か判定し、電圧値にノイズが含まれると判定した場合には、ノイズが含まれる前の所定回数分の移動平均を算出し、ノイズが含まれると判定した電圧値を移動平均値で置き換えることを特徴とする電圧検出装置。 A voltage detection circuit that detects a voltage of each of a plurality of battery cells constituting the battery and outputs a detection signal indicating the voltage; a voltage value acquisition unit that samples the detection signal at a predetermined interval to acquire a voltage value; A voltage detection device comprising:
The voltage value acquisition means determines whether or not noise is included in the voltage value acquired from the detection signal. If it is determined that the voltage value includes noise, the voltage value acquisition means is a predetermined number of times before the noise is included. A voltage detection apparatus that calculates a moving average and replaces a voltage value determined to contain noise with a moving average value.
前記所定の閾値として、前記バッテリの前記電池セルの特性、前記フィルタ回路の特性及び前記電圧値取得手段のサンプリング周期に基づいて推定された１つのサンプル間で発生しうる電圧値の変動よりも大きな値が設定されていることを特徴とする請求項２または３に記載の電圧検出装置。 A filter circuit that is provided between each battery cell of the battery and the voltage detection circuit, removes noise included in a voltage input from the battery cell of the battery, and outputs the voltage to the voltage detection circuit; A voltage detection device further comprising:
The predetermined threshold value is larger than the voltage value fluctuation that can occur between one sample estimated based on the characteristics of the battery cell of the battery, the characteristics of the filter circuit, and the sampling period of the voltage value acquisition means. 4. The voltage detection device according to claim 2, wherein a value is set.
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| JP2007166847A (en) * | 2005-12-16 | 2007-06-28 | Nissan Motor Co Ltd | Capacity regulator of battery pack |
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