JP6936039B2 - Semiconductor device, battery monitoring system, start signal detection method and communication method - Google Patents

Semiconductor device, battery monitoring system, start signal detection method and communication method Download PDF

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JP6936039B2
JP6936039B2 JP2017079318A JP2017079318A JP6936039B2 JP 6936039 B2 JP6936039 B2 JP 6936039B2 JP 2017079318 A JP2017079318 A JP 2017079318A JP 2017079318 A JP2017079318 A JP 2017079318A JP 6936039 B2 JP6936039 B2 JP 6936039B2
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関口　勝
勝 関口
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Lapis Semiconductor Co Ltd
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Description

本発明は、半導体装置、電池監視システム、起動信号の検出方法及び通信方法に関する。 The present invention relates to a semiconductor device, a battery monitoring system, a start signal detection method, and a communication method.

通信可能に接続された複数の電池監視用の半導体装置を用いて、組電池を構成する複数の電池セルの各々の状態を監視する電池監視システムが知られている。 There is known a battery monitoring system that monitors the state of each of a plurality of battery cells constituting an assembled battery by using a plurality of semiconductor devices for monitoring batteries connected so as to be able to communicate with each other.

例えば、特許文献１には、電池セル群の電池電圧を監視する監視手段と、電池セル群の電池電圧から駆動電圧を生成する電圧生成手段と、駆動電圧によって動作する通信手段と、省電力モード設定信号に応じて、電圧生成手段の駆動を制御する制御手段と、を各々が備えた複数の電池監視装置を備えた電池監視システムが記載されている。この電池監視システムにおいて、省電力モード設定信号が出力された場合、これを受信した一方の電池監視装置において、制御手段が電圧生成手段を起動させて駆動状態とし、駆動電圧に応じた供給電圧を他方の電池監視装置に供給する。供給電圧が供給された他方の電池監視装置において、制御手段が、電圧生成手段を起動させて駆動状態とする。 For example, Patent Document 1 describes a monitoring means for monitoring the battery voltage of a battery cell group, a voltage generating means for generating a drive voltage from the battery voltage of the battery cell group, a communication means operated by the drive voltage, and a power saving mode. A battery monitoring system including a control means for controlling the drive of the voltage generating means according to a set signal and a plurality of battery monitoring devices each equipped with the control means is described. When a power saving mode setting signal is output in this battery monitoring system, in one of the battery monitoring devices that receives the signal, the control means activates the voltage generating means to put it in the driving state, and supplies the supply voltage according to the driving voltage. Supply to the other battery monitoring device. In the other battery monitoring device to which the supply voltage is supplied, the control means activates the voltage generation means to bring it into a driving state.

特開２０１４−１３４４５４号公報Japanese Unexamined Patent Publication No. 2014-134454

複数の電池監視用の半導体装置（以下、電池監視ＩＣと称する）を、通信可能に多段接続して構成される電池監視システムにおいて、電池監視ＩＣの各々を停止状態（パワーダウン状態）から稼働状態に起動させる場合、複数の電池監視ＩＣを制御するコントローラから初段の電池監視ＩＣに起動信号を送信する。 In a battery monitoring system composed of a plurality of semiconductor devices for battery monitoring (hereinafter referred to as battery monitoring ICs) connected in multiple stages so as to be communicable, each of the battery monitoring ICs is in an operating state from a stopped state (power down state). A start signal is transmitted from a controller that controls a plurality of battery monitoring ICs to the first-stage battery monitoring ICs.

電池監視ＩＣの各々は、起動信号を検出する起動検出回路を備えており、初段の電池監視ＩＣは、自身の起動検出回路においてコントローラから供給される起動信号を検出すると稼働状態に移行し、次段の電池監視ＩＣに起動信号を送信する。次段の電池監視ＩＣは、自身の起動検出回路において初段の電池監視ＩＣから供給される起動信号を検出すると稼働状態に移行する。初段の電池監視ＩＣから次段の電池監視ＩＣへの起動信号の供給は、これらの電池監視ＩＣ間で通信を行うための通信線を介して行われる。この通信線にはノイズが混入する場合があり、通信線に混入したノイズによって、次段の電池監視ＩＣの起動検出回路において起動信号を誤検出する場合があった。 Each of the battery monitoring ICs is equipped with a start-up detection circuit that detects a start-up signal. A start signal is transmitted to the battery monitoring IC of the stage. When the battery monitoring IC in the next stage detects a start signal supplied from the battery monitoring IC in the first stage in its own start detection circuit, it shifts to the operating state. The supply of the start signal from the battery monitoring IC of the first stage to the battery monitoring IC of the next stage is performed via a communication line for communicating between these battery monitoring ICs. Noise may be mixed in this communication line, and the start signal may be erroneously detected in the start detection circuit of the battery monitoring IC in the next stage due to the noise mixed in the communication line.

また、電池監視ＩＣの各々は、通信線に接続された通信回路を備え、電池監視ＩＣ間で、種々のデータの送受信を行う。電池監視ＩＣ間での通信は、通信線に混入する同相ノイズの影響を排除するために差動信号を用いて行われる場合がある。例えば、初段の電池監視ＩＣの通信回路と通信を行う次段の電池監視ＩＣの通信回路に、ノイズを含んでいない電源電圧が与えられている場合において、通信線を介して初段の電池監視ＩＣから供給される通信信号にノイズが混入している場合について考える。通信信号に混入したノイズの振幅が、次段の電池監視ＩＣの通信回路に与えられる電源電圧の電圧幅を超えると、次段の電池監視ＩＣによって受信される受信信号が電源電圧の電圧レベルでクランプされ、初段の電池監視ＩＣから供給される通信信号を、次段の電池監視ＩＣにおいて適正に受信できなくなるおそれがある。 Further, each of the battery monitoring ICs is provided with a communication circuit connected to a communication line, and various data are transmitted and received between the battery monitoring ICs. Communication between the battery monitoring ICs may be performed using a differential signal in order to eliminate the influence of in-phase noise mixed in the communication line. For example, when a power supply voltage that does not include noise is applied to the communication circuit of the battery monitoring IC of the next stage that communicates with the communication circuit of the battery monitoring IC of the first stage, the battery monitoring IC of the first stage is supplied via the communication line. Consider the case where noise is mixed in the communication signal supplied from. When the amplitude of the noise mixed in the communication signal exceeds the voltage range of the power supply voltage given to the communication circuit of the battery monitoring IC in the next stage, the received signal received by the battery monitoring IC in the next stage is at the voltage level of the power supply voltage. The communication signal that is clamped and supplied from the battery monitoring IC of the first stage may not be properly received by the battery monitoring IC of the next stage.

本発明は、上記した点に鑑みてなされたものであり、通信線を介して行われる半導体装置間の通信において、通信線に混入するノイズに起因する弊害の発生を抑制することを目的とする。 The present invention has been made in view of the above points, and an object of the present invention is to suppress the occurrence of harmful effects caused by noise mixed in the communication line in communication between semiconductor devices performed via the communication line. ..

本発明に係る半導体装置は、差動伝送線路を構成する一対の第１の通信線を介して供給される起動信号を検出した場合に検出信号を出力する起動検出回路と、前記起動検出回路から前記検出信号が出力された場合にそれぞれ起動される第１の電源回路及び第２の電源回路と、前記第１の通信線に接続され、前記第１の電源回路から電源電圧の供給を受ける第１の通信回路と、前記第２の電源回路から電源電圧の供給を受けて起動した場合に前記起動信号を、差動伝送線路を構成する一対の第２の通信線に送出する第２の通信回路と、を含む。前記起動検出回路は、前記第１の通信線に接続される第１の入力端子及び第２の入力端子と、前記第１の端子と前記第２の端子との間に設けられ、前記第１の入力端子の電位が前記第２の入力端子の電位よりも高い場合に電流を発生させる整流部と、前記電流が発生した場合に電圧を発生させる電圧発生部と、前記電圧の発生に応じて前記検出信号を出力する出力部と、を含む。 The semiconductor device according to the present invention comprises a start-up detection circuit that outputs a detection signal when a start-up signal supplied via a pair of first communication lines constituting a differential transmission line is detected, and a start-up detection circuit. A first power supply circuit and a second power supply circuit that are activated when the detection signal is output, and a second power supply circuit that is connected to the first communication line and receives power supply voltage from the first power supply circuit. The first communication circuit and the second communication that sends the start signal to a pair of second communication lines constituting the differential transmission line when the power supply voltage is supplied from the second power supply circuit and is started. Including the circuit. The activation detection circuit is provided between the first input terminal and the second input terminal connected to the first communication line, and between the first terminal and the second terminal, and the first terminal is provided. A rectifying unit that generates a current when the potential of the input terminal of is higher than the potential of the second input terminal, a voltage generating unit that generates a voltage when the current is generated, and a voltage generating unit that generates a voltage when the current is generated, according to the generation of the voltage. Includes an output unit that outputs the detection signal.

本発明に係る電池監視システムは、直列接続された複数の電池セルの各々の状態を監視する、第１の半導体装置及び第２の半導体装置を含む電池監視システムである。前記第１の半導体装置及び前記第２の半導体装置は、それぞれ、差動伝送線路を構成する一対の第１の通信線を介して供給される起動信号を検出した場合に検出信号を出力する起動検出回路と、前記起動検出回路から前記検出信号が出力された場合にそれぞれ起動される第１の電源回路及び第２の電源回路と、前記第１の通信線に接続され、前記第１の電源回路から電源電圧の供給を受ける第１の通信回路と、前記第２の電源回路から電源電圧の供給を受けて起動した場合に前記起動信号を、差動伝送線路を構成する一対の第２の通信線に送出する第２の通信回路と、前記検出信号が出力された場合に起動される電源回路から電源電圧の供給を受け、前記複数の電池セルのうちの対応する電池セルの電圧を測定するセル電圧測定回路と、を含む。前記第１の半導体装置の前記第２の通信回路と、前記第２の半導体装置の前記第１の通信回路とが通信線を介して接続されている。前記起動検出回路は、前記第１の通信線に接続される第１の入力端子及び第２の入力端子と、前記第１の端子と前記第２の端子との間に設けられ、前記第１の入力端子の電位が前記第２の入力端子の電位よりも高い場合に電流を発生させる整流部と、前記電流が発生した場合に電圧を発生させる電圧発生部と、前記電圧の発生に応じて前記検出信号を出力する出力部と、を含む。 The battery monitoring system according to the present invention is a battery monitoring system including a first semiconductor device and a second semiconductor device that monitors the state of each of a plurality of battery cells connected in series. The first semiconductor device and the second semiconductor device each output a detection signal when they detect a start signal supplied via a pair of first communication lines constituting a differential transmission line. The detection circuit, the first power supply circuit and the second power supply circuit that are activated when the detection signal is output from the activation detection circuit, and the first power supply that are connected to the first communication line are connected to the first power supply. A first communication circuit that receives a power supply voltage from the circuit and a pair of second communication circuits that form a differential transmission line receive the start-up signal when the power supply voltage is supplied from the second power supply circuit. The power supply voltage is supplied from the second communication circuit transmitted to the communication line and the power supply circuit activated when the detection signal is output, and the voltage of the corresponding battery cell among the plurality of battery cells is measured. Includes a cell voltage measuring circuit. The second communication circuit of the first semiconductor device and the first communication circuit of the second semiconductor device are connected via a communication line. The activation detection circuit is provided between the first input terminal and the second input terminal connected to the first communication line, and between the first terminal and the second terminal, and the first terminal is provided. A rectifying unit that generates a current when the potential of the input terminal of is higher than the potential of the second input terminal, a voltage generating unit that generates a voltage when the current is generated, and a voltage generating unit that generates a voltage when the current is generated, according to the generation of the voltage. Includes an output unit that outputs the detection signal.

本発明に係る起動信号の検出方法は、差動伝送線路を構成する一対の通信線を介して供給される起動信号を検出した場合に、検出信号を出力する起動検出回路における前記起動信号の検出方法であって、前記通信線に接続される第１の入力端子及び第２の入力端子のうち、前記第１の入力端子の電位が前記第２の入力端子の電位よりも高い場合に電流を発生させ、前記第１の入力端子の電位が前記第２の入力端子の電位以下の場合に前記電流を発生させず、前記電流の発生に伴って発生する電圧に基づいて前記検出信号を出力することを含む。 The activation signal detection method according to the present invention detects the activation signal in the activation detection circuit that outputs the detection signal when the activation signal supplied via the pair of communication lines constituting the differential transmission line is detected. In the method, of the first input terminal and the second input terminal connected to the communication line, when the potential of the first input terminal is higher than the potential of the second input terminal, a current is applied. When the potential of the first input terminal is equal to or lower than the potential of the second input terminal, the current is not generated, and the detection signal is output based on the voltage generated with the generation of the current. Including that.

本発明に係る他の半導体装置は、電池セルから電圧の供給を受け、第１の電源電圧を出力する第１の電源回路と、前記第１の電源電圧の供給を受け、差動信号によって外部と通信を行う第１の通信回路と、前記電池セルから電圧の供給を受け、前記第１の電源電圧の電圧レベルとは異なる電圧レベルの第２の電源電圧を出力する第２の電源回路と、前記第２の電源電圧の供給を受け、差動信号によって外部と通信を行う第２の通信回路と、を含む。 The other semiconductor device according to the present invention receives a first power supply circuit that receives a voltage supply from a battery cell and outputs a first power supply voltage, and receives the supply of the first power supply voltage and externally receives a differential signal. A first communication circuit that communicates with the battery cell, and a second power supply circuit that receives a voltage supply from the battery cell and outputs a second power supply voltage having a voltage level different from the voltage level of the first power supply voltage. A second communication circuit that receives the supply of the second power supply voltage and communicates with the outside by a differential signal.

本発明に係る他の通信システムは、直列接続された複数の電池セルの各々の状態を監視する、第１の半導体装置及び第２の半導体装置を含む電池監視システムである。前記第１の半導体装置及び前記第２の半導体装置は、それぞれ、電池セルから電圧の供給を受け、第１の電源電圧を出力する第１の電源回路と、前記第１の電源電圧の供給を受け、差動信号によって外部と通信を行う第１の通信回路と、前記電池セルから電圧の供給を受け、前記第１の電源電圧の電圧レベルとは異なる電圧レベルの第２の電源電圧を出力する第２の電源回路と、前記第２の電源電圧の供給を受け、差動信号によって外部と通信を行う第２の通信回路と、前記複数の電池セルのうち、対応する電池セルの電圧を測定するセル電圧測定回路と、を含む。前記第１の半導体装置の前記第２の通信回路と、前記第２の半導体装置の前記第１の通信回路とが差動伝送線路を構成する一対の通信線を介して接続されている。 Another communication system according to the present invention is a battery monitoring system including a first semiconductor device and a second semiconductor device that monitors the state of each of a plurality of battery cells connected in series. The first semiconductor device and the second semiconductor device each receive a voltage supply from a battery cell and output a first power supply voltage to supply a first power supply circuit and the first power supply voltage. A first communication circuit that receives and communicates with the outside by a differential signal, and receives a voltage supply from the battery cell, and outputs a second power supply voltage with a voltage level different from the voltage level of the first power supply voltage. The voltage of the second power supply circuit, the second communication circuit that receives the supply of the second power supply voltage and communicates with the outside by a differential signal, and the voltage of the corresponding battery cell among the plurality of battery cells. Includes a cell voltage measuring circuit for measuring. The second communication circuit of the first semiconductor device and the first communication circuit of the second semiconductor device are connected via a pair of communication lines forming a differential transmission line.

本発明に通信方法は、直列接続された複数の電池セルのうち、高電位側の電池セルの電圧を測定するセル電圧測定回路を含む第１の半導体装置に設けられた通信回路と、前記複数の電池セルのうち、低電位側の電池セルの電圧を測定するセル電圧測定回路を含む第２の半導体装置に設けられた通信回路との間の通信方法であって、前記高電位側の電池セルから電圧の供給を受ける電源回路から出力される電圧を、前記第１の半導体装置に設けられた通信回路の電源電圧として供給し、前記低電位側の電池セルから電圧の供給を受ける電源回路から出力される電圧を、前記第２の半導体装置に設けられた通信回路の電源電圧として供給することを含む。 The communication method according to the present invention includes a communication circuit provided in a first semiconductor device including a cell voltage measuring circuit for measuring the voltage of a battery cell on the high potential side among a plurality of battery cells connected in series, and the plurality of communication circuits. A method of communicating with a communication circuit provided in a second semiconductor device including a cell voltage measuring circuit for measuring the voltage of a battery cell on the low potential side among the battery cells of the above. A power supply circuit that supplies the voltage output from the power supply circuit that receives the voltage supply from the cell as the power supply voltage of the communication circuit provided in the first semiconductor device, and receives the voltage supply from the battery cell on the low potential side. The voltage output from is supplied as the power supply voltage of the communication circuit provided in the second semiconductor device.

本発明によれば、通信線を介して行われる半導体装置間の通信において、通信線に混入するノイズに起因する弊害の発生を抑制することができる。 According to the present invention, in communication between semiconductor devices performed via a communication line, it is possible to suppress the occurrence of harmful effects caused by noise mixed in the communication line.

本発明の実施形態に係る電池監視システムの構成を示す回路ブロック図である。It is a circuit block diagram which shows the structure of the battery monitoring system which concerns on embodiment of this invention. 本発明の実施形態に係る起動検出回路の構成の一例を示す回路図である。It is a circuit diagram which shows an example of the structure of the activation detection circuit which concerns on embodiment of this invention. 本発明の実施形態に係る電池監視システムの起動時の動作を示すタイミングチャートである。It is a timing chart which shows the operation at the time of starting of the battery monitoring system which concerns on embodiment of this invention. 電池セルの接続ラインにノイズが発生していない場合における、本発明の実施形態に係る電池監視システムの起動時の各部の電圧を示すタイミングチャートである。It is a timing chart which shows the voltage of each part at the time of starting of the battery monitoring system which concerns on embodiment of this invention in the case where noise is not generated in the connection line of a battery cell. 電池セルの接続ラインにノイズが発生している場合における、本発明の実施形態に係る電池監視システムの起動時の各部の電圧を示すタイミングチャートである。It is a timing chart which shows the voltage of each part at the time of starting of the battery monitoring system which concerns on embodiment of this invention in the case where noise is generated in the connection line of a battery cell. 比較例に係る起動検出回路の構成を示す回路図である。It is a circuit diagram which shows the structure of the start detection circuit which concerns on a comparative example. 比較例に係る起動検出回路を用いた電池監視システムの起動時の各部の電圧を示すタイミングチャートである。It is a timing chart which shows the voltage of each part at the time of starting of the battery monitoring system using the start detection circuit which concerns on a comparative example. 比較例に係る起動検出回路を用いた電池監視システムの起動時の各部の電圧を示すタイミングチャートである。It is a timing chart which shows the voltage of each part at the time of starting of the battery monitoring system using the start detection circuit which concerns on a comparative example. 電池セルの接続ラインにノイズが発生していない場合における、初段の電池監視ＩＣから次段の電池監視ＩＣへの信号伝送時における、電池監視ＩＣの各部の電圧を示すタイミングチャートである。It is a timing chart which shows the voltage of each part of the battery monitoring IC at the time of signal transmission from the battery monitoring IC of the first stage to the battery monitoring IC of the next stage when noise is not generated in the connection line of a battery cell. 電池セルの接続ラインにノイズが発生していない場合における、初段の電池監視ＩＣから次段の電池監視ＩＣへの信号伝送時における、電池監視ＩＣの各部の電圧を示すタイミングチャートである。It is a timing chart which shows the voltage of each part of the battery monitoring IC at the time of signal transmission from the battery monitoring IC of the first stage to the battery monitoring IC of the next stage when noise is not generated in the connection line of a battery cell. 電池セルの接続ラインにノイズが発生している場合における、初段の電池監視ＩＣから次段の電池監視ＩＣへの信号伝送時における、電池監視ＩＣの各部の電圧を示すタイミングチャートである。It is a timing chart which shows the voltage of each part of the battery monitoring IC at the time of signal transmission from the battery monitoring IC of the first stage to the battery monitoring IC of the next stage when noise is generated in the connection line of a battery cell. 電池セルの接続ラインにノイズが発生している場合における、初段の電池監視ＩＣから次段の電池監視ＩＣへの信号伝送時における、電池監視ＩＣの各部の電圧を示すタイミングチャートである。It is a timing chart which shows the voltage of each part of the battery monitoring IC at the time of signal transmission from the battery monitoring IC of the first stage to the battery monitoring IC of the next stage when noise is generated in the connection line of a battery cell. 比較例に係る電池監視ＩＣを備えた電池監視システムの構成を示す回路ブロック図である。It is a circuit block diagram which shows the structure of the battery monitoring system provided with the battery monitoring IC which concerns on a comparative example. 比較例に係る電池監視システムにおいて、電池セルの接続ラインにノイズが発生している場合における、初段の電池監視ＩＣから次段の電池監視ＩＣへの信号伝送時における、電池監視ＩＣの各部の電圧を示すタイミングチャートである。In the battery monitoring system according to the comparative example, the voltage of each part of the battery monitoring IC at the time of signal transmission from the first stage battery monitoring IC to the next stage battery monitoring IC when noise is generated in the connection line of the battery cell. It is a timing chart which shows. 比較例に係る電池監視システムにおいて、電池セルの接続ラインにノイズが発生している場合における、初段の電池監視ＩＣから次段の電池監視ＩＣへの信号伝送時における、電池監視ＩＣの各部の電圧を示すタイミングチャートである。In the battery monitoring system according to the comparative example, the voltage of each part of the battery monitoring IC at the time of signal transmission from the first stage battery monitoring IC to the next stage battery monitoring IC when noise is generated in the connection line of the battery cell. It is a timing chart which shows.

以下、本発明の実施形態について図面を参照しつつ説明する。尚、各図面において、実質的に同一又は等価な構成要素又は部分には同一の参照符号を付している。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, substantially the same or equivalent components or parts are designated by the same reference numerals.

図１は、本発明の実施形態に係る電池監視システム１の構成を示す回路ブロック図である。電池監視システム１は、直列接続された複数の電池セル５０を含む組電池の各電池セル５０の状態を監視するシステムである FIG. 1 is a circuit block diagram showing a configuration of a battery monitoring system 1 according to an embodiment of the present invention. The battery monitoring system 1 is a system that monitors the state of each battery cell 50 of the assembled battery including a plurality of battery cells 50 connected in series.

電池監視システム１は、縦列接続された電池監視ＩＣ１０＿１及び１０＿２と、電池監視ＩＣ１０＿１及び１０＿２を制御するＭＣＵ（Micro Controller Unit）２２と、ＭＣＵ２２と電池監視ＩＣ１０＿１とを通信可能に接続するとともにこれらを電気的に絶縁するトランス等を含む絶縁回路２４と、複数の電池セル５０を含んで構成される組電池と、を有する。なお、本実施形態では、一例として、電池監視ＩＣを２段構成とした電池監視システムを例示しているが、電池監視ＩＣの段数は、監視対象となる電池セルの数に応じて適宜変更することが可能である。 The battery monitoring system 1 communicatively connects the battery monitoring ICs 10_1 and 10_2 connected in series, the MCU (Micro Controller Unit) 22 that controls the battery monitoring ICs 10_1 and 10_2, and the MCU 22 and the battery monitoring IC 10_1, and electrically connects them. It has an insulating circuit 24 including a transformer and the like that substantially insulates the battery, and an assembled battery including a plurality of battery cells 50. In this embodiment, as an example, a battery monitoring system in which the battery monitoring IC has a two-stage configuration is illustrated, but the number of stages of the battery monitoring IC is appropriately changed according to the number of battery cells to be monitored. It is possible.

複数の電池セル５０は、各々が互いに異なる複数の電池セルを含むように群分けされ、電池セル群５１Ａ、５１Ｂを形成している。電池監視ＩＣ１０＿１は、高電位側の電池セル群５１Ａに対応して設けられ、電池セル群５１Ａに含まれる電池セル５０の各々の状態を監視する。電池監視ＩＣ１０＿２は、電池セル群５１Ｂに対応して設けられ、電池セル群５１Ｂに含まれる電池セル５０の各々の状態を監視する。なお、電池監視ＩＣ１０＿１、１０＿２がそれぞれ監視する電池セル５０の数は、適宜変更することが可能である。 The plurality of battery cells 50 are grouped so as to include a plurality of battery cells, each of which is different from each other, and form the battery cell groups 51A and 51B. The battery monitoring IC 10_1 is provided corresponding to the battery cell group 51A on the high potential side, and monitors the state of each of the battery cells 50 included in the battery cell group 51A. The battery monitoring IC 10_2 is provided corresponding to the battery cell group 51B, and monitors the state of each of the battery cells 50 included in the battery cell group 51B. The number of battery cells 50 monitored by the battery monitoring ICs 10_1 and 10_2 can be changed as appropriate.

電池監視ＩＣ１０＿１及び１０＿２は、それぞれ、半導体基板に形成された集積回路（ＩＣ：Integrated Circuit）を含む半導体装置である。電池監視ＩＣ１０＿１及び１０＿２は、互いに同じ構成を有しており、それぞれ、昇圧回路１１、降圧回路１２、セル電圧測定回路１３、起動検出回路１４、レギュレータ１５、制御回路１６、第１の通信回路１７、第２の通信回路１８及びスイッチ回路１９を含んで構成されている。 The battery monitoring ICs 10_1 and 10_2 are semiconductor devices including integrated circuits (ICs) formed on semiconductor substrates, respectively. The battery monitoring ICs 10_1 and 10_2 have the same configuration as each other, and are a booster circuit 11, a step-down circuit 12, a cell voltage measurement circuit 13, a start detection circuit 14, a regulator 15, a control circuit 16, and a first communication circuit 17, respectively. , A second communication circuit 18 and a switch circuit 19 are included.

セル電圧測定回路１３は、対応する電池セル群を構成する各電池セル５０の各電極に接続され、各電池セル５０のセル電圧を測定する。 The cell voltage measuring circuit 13 is connected to each electrode of each battery cell 50 constituting the corresponding battery cell group, and measures the cell voltage of each battery cell 50.

電池セル群５１Ａ及び５１Ｂにおける、最も高電位側の電池セルの正極の電圧は、それぞれ、ローパスフィルタ２０によってノイズ成分が除去される。昇圧回路１１は、ローパスフィルタ２０から出力されるノイズ成分が除去された電圧ＶＣＣを昇圧した電圧ＶＵＰ（＞ＶＣＣ）を出力する。昇圧回路１１から出力される電圧ＶＵＰは、セル電圧測定回路１３に供給される。 The voltage of the positive electrode of the battery cell on the highest potential side in the battery cell groups 51A and 51B has a noise component removed by the low-pass filter 20, respectively. The booster circuit 11 outputs a voltage VUP (> VCS) that boosts the voltage VCS from which the noise component output from the low-pass filter 20 has been removed. The voltage VUP output from the booster circuit 11 is supplied to the cell voltage measurement circuit 13.

降圧回路１２は、対応する電池セル群における、最も高電位側の電池セル５０の正極に直接接続されており、当該電池セルの正極の電圧ＶＣＣ１を降圧した電圧ＶＣＣ２（＜ＶＣＣ１）を出力する。 The step-down circuit 12 is directly connected to the positive electrode of the battery cell 50 on the highest potential side in the corresponding battery cell group, and outputs the voltage VCS2 (<VCC1) obtained by stepping down the voltage VCS1 of the positive electrode of the battery cell.

レギュレータ１５の低電位側の電源入力端子には、対応する電池セル群における、最も低電位側の電池セル５０の負極が接続されており、当該電池セル５０の負極の電圧ＶＳＳが入力される。レギュレータ１５の高電位側の電源入力端子には、ローパスフィルタ２０の出力端子が接続されており、ローパスフィルタ２０の出力電圧ＶＣＣが入力される。レギュレータ１５は、所定の電圧レベルを有する電圧ＶＤＤ（＜ＶＣＣ２）を出力する。 The negative electrode of the battery cell 50 on the lowest potential side in the corresponding battery cell group is connected to the power input terminal on the low potential side of the regulator 15, and the voltage VSS of the negative electrode of the negative electrode of the battery cell 50 is input. The output terminal of the low-pass filter 20 is connected to the power input terminal on the high potential side of the regulator 15, and the output voltage VCS of the low-pass filter 20 is input. The regulator 15 outputs a voltage VDD (<VCC2) having a predetermined voltage level.

第１の通信回路１７には、対応する電池セル群における、最も高電位側の電池セル５０の正極の電圧ＶＣＣ１及び降圧回路１２から出力される電圧ＶＣＣ２が電源電圧として供給される。電池監視ＩＣ１０＿１の第１の通信回路１７は、一対の通信線Ｌ１及びＬ２を介して絶縁回路２４に接続されている。通信線Ｌ１及びＬ２は、差動伝送線路を構成し、信号レベルが相補関係にある差動信号を伝送する。すなわち、第１の通信回路１７は、通信線Ｌ１及びＬ２を介して、差動信号を用いてＭＣＵ２２との間で通信を行う。 In the first communication circuit 17, the voltage VCS1 of the positive electrode of the battery cell 50 on the highest potential side and the voltage VCS2 output from the step-down circuit 12 in the corresponding battery cell group are supplied as the power supply voltage. The first communication circuit 17 of the battery monitoring IC 10_1 is connected to the insulation circuit 24 via a pair of communication lines L1 and L2. The communication lines L1 and L2 form a differential transmission line and transmit differential signals having complementary signal levels. That is, the first communication circuit 17 communicates with the MCU 22 using the differential signal via the communication lines L1 and L2.

第２の通信回路１８には、対応する電池セル群における、最も低電位側の電池セル５０の負極の電圧ＶＳＳ及びレギュレータ１５から出力される電圧ＶＤＤが電源電圧として供給される。電池監視ＩＣ１０＿１の第２の通信回路１８は、一対の通信線Ｌ３及びＬ４を介して電池監視ＩＣ１０＿２の第１の通信回路１７に接続されている。通信線Ｌ３及びＬ４は、差動伝送線路を構成し、信号レベルが相補関係にある差動信号を伝送する。すなわち、電池監視ＩＣ１０＿１の第２の通信回路１８と、電池監視ＩＣ１０＿２の第１の通信回路１７は、通信線Ｌ３及びＬ４を介して、差動信号を用いて相互に通信を行う。通信線Ｌ３の途中及び通信線Ｌ４の途中には、それぞれ、直流成分を遮断するキャパシタＣ１及びＣ２が設けられている。 In the second communication circuit 18, the voltage VSS of the negative electrode of the battery cell 50 on the lowest potential side in the corresponding battery cell group and the voltage VDD output from the regulator 15 are supplied as the power supply voltage. The second communication circuit 18 of the battery monitoring IC 10_1 is connected to the first communication circuit 17 of the battery monitoring IC 10_2 via a pair of communication lines L3 and L4. The communication lines L3 and L4 form a differential transmission line and transmit differential signals having complementary signal levels. That is, the second communication circuit 18 of the battery monitoring IC 10_1 and the first communication circuit 17 of the battery monitoring IC 10_2 communicate with each other using the differential signals via the communication lines L3 and L4. Capacitors C1 and C2 for blocking the DC component are provided in the middle of the communication line L3 and in the middle of the communication line L4, respectively.

制御回路１６は、第１の通信回路１７、第２の通信回路１８及びセル電圧測定回路１３を制御する。 The control circuit 16 controls the first communication circuit 17, the second communication circuit 18, and the cell voltage measurement circuit 13.

電池監視ＩＣ１０＿１の起動検出回路１４は、スイッチ回路１９を介して通信線Ｌ１及びＬ２に接続されている。電池監視ＩＣ１０＿１の起動検出回路１４は、電池監視ＩＣ１０＿１が停止状態（パワーダウン状態）にある場合に、ＭＣＵ２２から通信線Ｌ１及びＬ２を介して供給される起動信号を検出すると検出信号Ｓｄを出力する。電池監視ＩＣ１０＿１の起動検出回路１４から出力される検出信号Ｓｄは、電池監視ＩＣ１０＿１の昇圧回路１１、降圧回路１２、レギュレータ１５に供給される。停止状態にある電池監視ＩＣ１０＿１の昇圧回路１１、降圧回路１２、レギュレータ１５は、検出信号Ｓｄが供給されると起動し、それぞれ電圧ＶＵＰ、ＶＣＣ２、ＶＤＤを出力する。 The start detection circuit 14 of the battery monitoring IC 10_1 is connected to the communication lines L1 and L2 via the switch circuit 19. The start detection circuit 14 of the battery monitoring IC 10_1 outputs a detection signal Sd when it detects a start signal supplied from the MCU 22 via the communication lines L1 and L2 when the battery monitoring IC 10_1 is in the stopped state (power down state). .. The detection signal Sd output from the start detection circuit 14 of the battery monitoring IC 10_1 is supplied to the step-up circuit 11, the step-down circuit 12, and the regulator 15 of the battery monitoring IC 10_1. The step-up circuit 11, step-down circuit 12, and regulator 15 of the battery monitoring IC 10_1 in the stopped state are activated when the detection signal Sd is supplied, and output voltages VUP, VCS2, and VDD, respectively.

電池監視ＩＣ１０＿２の起動検出回路１４は、スイッチ回路１９回路を介して通信線Ｌ３及びＬ４に接続されている。電池監視ＩＣ１０＿２の起動検出回路１４は、電池監視ＩＣ１０＿２が停止状態（パワーダウン状態）にある場合に、先に稼働状態となった電池監視ＩＣ１０＿１の第２の通信回路１８から通信線Ｌ３及びＬ４を介して供給される起動信号を検出すると、検出信号Ｓｄを出力する。電池監視ＩＣ１０＿２の起動検出回路１４から出力される検出信号Ｓｄは、電池監視ＩＣ１０＿２の昇圧回路１１、降圧回路１２、レギュレータ１５に供給される。停止状態にある電池監視ＩＣ１０＿２の昇圧回路１１、降圧回路１２、レギュレータ１５は、検出信号Ｓｄが供給されると起動し、それぞれ電圧ＶＵＰ、ＶＣＣ２、ＶＤＤを出力する。 The start detection circuit 14 of the battery monitoring IC 10_2 is connected to the communication lines L3 and L4 via the switch circuit 19 circuit. The start detection circuit 14 of the battery monitoring IC 10_2 connects the communication lines L3 and L4 from the second communication circuit 18 of the battery monitoring IC 10_1 that has been in the operating state earlier when the battery monitoring IC 10_2 is in the stopped state (power down state). When the activation signal supplied via the system is detected, the detection signal Sd is output. The detection signal Sd output from the start detection circuit 14 of the battery monitoring IC 10_2 is supplied to the step-up circuit 11, the step-down circuit 12, and the regulator 15 of the battery monitoring IC 10_2. The step-up circuit 11, step-down circuit 12, and regulator 15 of the battery monitoring IC 10_2 in the stopped state are activated when the detection signal Sd is supplied, and output voltages VUP, VCS2, and VDD, respectively.

図２は、本発明の実施形態に係る起動検出回路１４の構成の一例を示す回路図である。起動検出回路１４は、スイッチ回路１９を介して通信線Ｌ１（またはＬ４）に接続される入力端子Ｔ１及びスイッチ回路１９を介して通信線Ｌ２（またはＬ３）に接続される入力端子Ｔ２を有する。入力端子Ｔ１及びＴ２は、それぞれ、抵抗素子Ｒ１及びＲ２を介して電圧ＶＣＣが供給されるＶＣＣラインに接続されており、電圧ＶＣＣにプルアップされている。 FIG. 2 is a circuit diagram showing an example of the configuration of the activation detection circuit 14 according to the embodiment of the present invention. The activation detection circuit 14 has an input terminal T1 connected to the communication line L1 (or L4) via the switch circuit 19 and an input terminal T2 connected to the communication line L2 (or L3) via the switch circuit 19. The input terminals T1 and T2 are connected to the VCS line to which the voltage VCS is supplied via the resistance elements R1 and R2, respectively, and are pulled up to the voltage VCS.

起動検出回路１４は、入力端子Ｔ１とＴ２との間に設けられた抵抗素子Ｒ３及びダイオードＤ１を含んで構成される整流部３１を有する。抵抗素子Ｒ３は、一端が入力端子Ｔ１に接続され、他端がダイオードＤ１のアノードに接続されている。ダイオードＤ１のカソードは入力端子Ｔ２に接続されている。 The start detection circuit 14 has a rectifying unit 31 including a resistance element R3 and a diode D1 provided between the input terminals T1 and T2. One end of the resistance element R3 is connected to the input terminal T1 and the other end is connected to the anode of the diode D1. The cathode of the diode D1 is connected to the input terminal T2.

起動検出回路１４は、整流部３１に電流が発生した場合に電圧を発生させる電圧発生部３２を有する。電圧発生部３２は、ｐチャネル型のトランジスタＭ１、抵抗素子Ｒ４、インバータＡ１及びＡ２を含んで構成されている。トランジスタＭ１は、ゲートが抵抗素子Ｒ３とダイオードＤ１との接続点に接続され、ソースが入力端子Ｔ１に接続され、ドレインが抵抗素子Ｒ４の一端に接続されている。抵抗素子Ｒ４の他端は、電圧ＶＳＳが供給されるＶＳＳラインに接続されている。インバータＡ１は、入力端がトランジスタＭ１と抵抗素子Ｒ４との接続点に接続され、出力端がインバータＡ２の入力端に接続されている。 The start detection circuit 14 has a voltage generating unit 32 that generates a voltage when a current is generated in the rectifying unit 31. The voltage generating unit 32 includes a p-channel type transistor M1, a resistance element R4, and inverters A1 and A2. In the transistor M1, the gate is connected to the connection point between the resistance element R3 and the diode D1, the source is connected to the input terminal T1, and the drain is connected to one end of the resistance element R4. The other end of the resistance element R4 is connected to a VSS line to which the voltage VSS is supplied. The input end of the inverter A1 is connected to the connection point between the transistor M1 and the resistance element R4, and the output end is connected to the input end of the inverter A2.

起動検出回路１４は、電圧発生部３２における電圧の発生に応じて検出信号Ｓｄを出力する出力部３３として機能するラッチ回路Ｌａを有する。ラッチ回路Ｌａの入力端は、インバータＡ２の出力端に接続されている。 The start detection circuit 14 has a latch circuit La that functions as an output unit 33 that outputs a detection signal Sd in response to the generation of a voltage in the voltage generation unit 32. The input end of the latch circuit La is connected to the output end of the inverter A2.

以下に、電池監視システム１の起動時の動作について説明する。図３は、電池監視システム１の起動時の動作を示すタイミングチャートである。 The operation at the time of starting the battery monitoring system 1 will be described below. FIG. 3 is a timing chart showing the operation of the battery monitoring system 1 at startup.

電池監視ＩＣ１０＿１及び１０＿２が停止状態（パワーダウン状態）にある場合、電池監視ＩＣ１０＿１及び１０＿２において、昇圧回路１１、降圧回路１２、レギュレータ１５はオフ状態であり、電圧ＶＣＣ１、ＶＣＣ２及びＶＤＤは発生していない。すなわち、電池監視ＩＣ１０＿１及び１０＿２において、第１の通信回路１７、第２の通信回路１８及び制御回路１６には、電源電圧が供給されていないので、これらの回路は停止状態である。電池監視ＩＣ１０＿１及び１０＿２が停止状態にある場合、スイッチ回路１９のスイッチはオン状態とされ、起動検出回路１４が、起動信号を受信できる状態になっている。 When the battery monitoring ICs 10_1 and 10_2 are in the stopped state (power down state), the booster circuit 11, the step-down circuit 12, and the regulator 15 are in the off state in the battery monitoring ICs 10_1 and 10_2, and the voltages VCS1, VCS2, and VDD are generated. No. That is, in the battery monitoring ICs 10_1 and 10_2, since the power supply voltage is not supplied to the first communication circuit 17, the second communication circuit 18, and the control circuit 16, these circuits are in a stopped state. When the battery monitoring ICs 10_1 and 10_2 are in the stopped state, the switch of the switch circuit 19 is turned on, and the start detection circuit 14 is in a state of being able to receive the start signal.

ＭＣＵ２２から起動信号が出力されると、絶縁回路２４において、起動信号が差動信号形式の信号に変換される。差動信号形式に変換された起動信号は、通信線Ｌ１及びＬ２を介して初段の電池監視ＩＣ１０＿１に入力され、スイッチ回路１９を介して電池監視ＩＣ１０＿１の起動検出回路１４に入力される。初段の電池監視ＩＣ１０＿１の起動検出回路１４は、起動信号を検出すると、検出信号Ｓｄを出力し、これを電池監視ＩＣ１０＿１の昇圧回路１１、降圧回路１２及びレギュレータ１５に供給する。電池監視ＩＣ１０＿１の昇圧回路１１、降圧回路１２及びレギュレータ１５は検出信号Ｓｄが供給されると起動し、それぞれ、電圧ＶＵＰ、ＶＣＣ１及びＶＣＣ２、ＶＤＤを出力する。これにより、電池監視ＩＣ１０＿１のセル電圧測定回路１３、制御回路１６、第１の通信回路１７及び第２の通信回路１８が電源電圧の供給を受けることになり、これらの回路が起動し、電池監視ＩＣ１０＿１が稼働状態となる。 When the start signal is output from the MCU 22, the start signal is converted into a signal in the differential signal format in the insulation circuit 24. The start signal converted into the differential signal format is input to the battery monitoring IC 10_1 of the first stage via the communication lines L1 and L2, and is input to the start detection circuit 14 of the battery monitoring IC 10_1 via the switch circuit 19. When the start detection circuit 14 of the battery monitoring IC 10_1 in the first stage detects the start signal, it outputs a detection signal Sd and supplies the detection signal Sd to the step-up circuit 11, the step-down circuit 12 and the regulator 15 of the battery monitoring IC 10_1. The step-up circuit 11, step-down circuit 12 and regulator 15 of the battery monitoring IC 10_1 are activated when the detection signal Sd is supplied, and output voltages VUP, VCS1 and VCS2 and VDD, respectively. As a result, the cell voltage measuring circuit 13, the control circuit 16, the first communication circuit 17, and the second communication circuit 18 of the battery monitoring IC 10_1 are supplied with the power supply voltage, and these circuits are activated to monitor the battery. IC10_1 is put into operation.

稼働状態となった初段の電池監視ＩＣ１０＿１の第２の通信回路１８は差動信号形式の起動信号を出力し、通信線Ｌ３及びＬ４を介して次段の電池監視ＩＣ１０＿２に供給する。ここで、初段の電池監視ＩＣ１０＿１から送信される差動信号形式の起動信号をＴＸ、ＴＸＮとし、次段の電池監視ＩＣ１０＿２において受信される差動信号形式の起動信号をＲＸ、ＲＸＮとする。次段の電池監視ＩＣ１０＿２の起動検出回路１４は、起動信号を検出すると検出信号Ｓｄを出力する。これにより、次段の電池監視ＩＣ１０＿２のセル電圧測定回路１３、制御回路１６、第１の通信回路１７及び第２の通信回路１８が起動し、電池監視ＩＣ１０＿２が稼働状態となる。 The second communication circuit 18 of the first-stage battery monitoring IC 10_1 in the operating state outputs a start signal in the form of a differential signal and supplies the start signal to the next-stage battery monitoring IC 10_2 via the communication lines L3 and L4. Here, the differential signal type start signals transmitted from the first-stage battery monitoring IC 10_1 are referred to as TX and TXN, and the differential signal type start signals received by the next-stage battery monitoring IC 10_2 are referred to as RX and RXN. When the start detection circuit 14 of the battery monitoring IC 10_2 in the next stage detects the start signal, it outputs the detection signal Sd. As a result, the cell voltage measurement circuit 13, the control circuit 16, the first communication circuit 17, and the second communication circuit 18 of the battery monitoring IC 10_2 in the next stage are activated, and the battery monitoring IC 10_2 is put into operation.

組電池を構成する複数の電池セル５０が直列接続された接続ラインには、ノイズが発生する場合がある。従って、電池セル群５１Ａ及び電池セル群５１Ｂの接続点の電圧ＶＳＳにもノイズが重畳する。電池監視ＩＣ１０＿１においては、電圧ＶＳＳが供給されるレギュレータ１５から出力される電圧ＶＤＤにもノイズが重畳する。更に、電圧ＶＳＳ及び電圧ＶＤＤが電源電圧として供給される第２の通信回路１８に接続された通信線Ｌ３（ＴＸ、ＲＸ）、Ｌ４（ＴＸＮ、ＲＸＮ）にもノイズが重畳する。なお、通信線Ｌ３（ＴＸ、ＲＸ）、Ｌ４（ＴＸＮ、ＲＸＮ）に重畳するノイズは同相ノイズである。 Noise may occur in the connection line in which a plurality of battery cells 50 constituting the assembled battery are connected in series. Therefore, noise is also superimposed on the voltage VSS at the connection points of the battery cell group 51A and the battery cell group 51B. In the battery monitoring IC 10_1, noise is also superimposed on the voltage VDD output from the regulator 15 to which the voltage VSS is supplied. Further, noise is superimposed on the communication lines L3 (TX, RX) and L4 (TXN, RXN) connected to the second communication circuit 18 to which the voltage VSS and the voltage VDD are supplied as the power supply voltage. The noise superimposed on the communication lines L3 (TX, RX) and L4 (TXN, RXN) is in-phase noise.

図４Ａは、電池セル５０の接続ラインにノイズが発生していない場合における、電池監視システム１の起動時における各部の電圧を示すタイミングチャートである。図４Ｂは、電池セル５０の接続ラインにノイズが発生している場合における、電池監視システム１の起動時における各部の電圧を示すタイミングチャートである。 FIG. 4A is a timing chart showing the voltage of each part at the time of starting the battery monitoring system 1 when noise is not generated in the connection line of the battery cell 50. FIG. 4B is a timing chart showing the voltage of each part at the time of starting the battery monitoring system 1 when noise is generated in the connection line of the battery cell 50.

本発明の実施形態に係る起動検出回路１４によれば、電池セル５０の接続ライン発生するノイズに起因して、通信線Ｌ３、Ｌ４を介して初段の電池監視ＩＣ１０＿１から次段の電池監視ＩＣ１０＿２に供給される起動信号（ＴＸ、ＴＸＮ、ＲＸ、ＲＸＮ）にノイズが重畳した場合でも、次段の電池監視ＩＣ１０＿２の起動検出回路１４は、ノイズが発生していない場合（図４Ａ参照）と同様適切なタイミングで検出信号Ｓｄを出力することができる。すなわち、本発明の実施形態にかかる起動検出回路１４によれば、起動信号が伝送される通信線にノイズが発生している場合でも、起動信号の誤検出を防止することができる。 According to the start detection circuit 14 according to the embodiment of the present invention, due to the noise generated in the connection line of the battery cell 50, the first stage battery monitoring IC 10_1 is changed to the next stage battery monitoring IC 10_2 via the communication lines L3 and L4. Even when noise is superimposed on the supplied start signals (TX, TXN, RX, RXN), the start detection circuit 14 of the battery monitoring IC 10_2 in the next stage is appropriate as in the case where no noise is generated (see FIG. 4A). The detection signal Sd can be output at various timings. That is, according to the activation detection circuit 14 according to the embodiment of the present invention, it is possible to prevent erroneous detection of the activation signal even when noise is generated in the communication line through which the activation signal is transmitted.

以下に、起動検出回路１４の動作について説明する。起動検出回路１４の入力端子Ｔ１及びＴ２が同電位である場合、ダイオードＤ１はオフ状態を維持するので、抵抗素子Ｒ３及びダイオードＤ１によって構成される整流部３１は、電流を発生させない。従ってトランジスタＭ１はオフ状態を維持するので、インバータＡ１の入力端及びインバータＡ２の出力端はローレベルを維持する。これにより、ラッチ回路Ｌａから出力される検出信号Ｓｄの信号レベルは、起動信号の未検出を示すローレベルを維持する。入力端子Ｔ２の電位が入力端子Ｔ１の電位よりも高くなる場合についても同様である。 The operation of the start detection circuit 14 will be described below. When the input terminals T1 and T2 of the start detection circuit 14 have the same potential, the diode D1 maintains the off state, so that the rectifying unit 31 composed of the resistance element R3 and the diode D1 does not generate a current. Therefore, since the transistor M1 maintains the off state, the input end of the inverter A1 and the output end of the inverter A2 maintain the low level. As a result, the signal level of the detection signal Sd output from the latch circuit La maintains a low level indicating that the start signal has not been detected. The same applies to the case where the potential of the input terminal T2 is higher than the potential of the input terminal T1.

一方、起動検出回路１４の入力端子Ｔ１及びＴ２に起動信号が入力され、入力端子Ｔ１の電位が、入力端子Ｔ２の電位よりも高くなり、入力端子Ｔ１とＴ２との電位差が、ダイオードＤ１の順方向電圧ＶＦよりも大きくなると、ダイオードＤ１はオン状態となり、抵抗素子Ｒ３及びダイオードＤ１によって構成される整流部３１は、電流を発生させる。この電流により抵抗素子Ｒ３の両端に電位差が生じ、トランジスタＭ１がオン状態となる。トランジスタＭ１がオン状態となると抵抗素子Ｒ４に電流が流れ、インバータＡ１の入力端にはハイレベルの電圧が入力され、インバータＡ２の出力端には、ハイレベルの電圧が発生する。これにより、ラッチ回路Ｌａから出力される検出信号Ｓｄの信号レベルは、起動信号を検出したこと示すハイレベルに遷移する。ラッチ回路Ｌａは、検出信号Ｓｄの信号レベルをハイレベルに遷移させると、電池監視ＩＣが稼働状態にある間、検出信号Ｓｄの信号レベルをハイレベルに維持する。 On the other hand, a start signal is input to the input terminals T1 and T2 of the start detection circuit 14, the potential of the input terminal T1 becomes higher than the potential of the input terminal T2, and the potential difference between the input terminals T1 and T2 is in the order of the diode D1. When the voltage becomes larger than the directional voltage VF, the diode D1 is turned on, and the rectifying unit 31 composed of the resistance element R3 and the diode D1 generates a current. This current causes a potential difference between both ends of the resistance element R3, and the transistor M1 is turned on. When the transistor M1 is turned on, a current flows through the resistance element R4, a high level voltage is input to the input end of the inverter A1, and a high level voltage is generated at the output end of the inverter A2. As a result, the signal level of the detection signal Sd output from the latch circuit La transitions to a high level indicating that the start signal has been detected. When the signal level of the detection signal Sd is changed to a high level, the latch circuit La maintains the signal level of the detection signal Sd at a high level while the battery monitoring IC is in the operating state.

このように、本実施形態に係る起動検出回路１４によれば、入力端子Ｔ１の電位が、入力端子Ｔ２の電位よりも高くなる場合に、検出信号Ｓｄの信号レベルが起動信号を検出したことを示すハイレベルに遷移し、入力端子Ｔ１の電位と入力端子Ｔ２の電位が同じ場合、及び入力端子Ｔ２の電位が入力端子Ｔ１の電位よりも高くなる場合には、検出信号Ｓｄの信号レベルはローレベルを維持する。従って、通信線Ｌ３、Ｌ４を介して初段の電池監視ＩＣ１０＿１から次段の電池監視ＩＣ１０＿２に供給される起動信号（ＴＸ、ＴＸＮ、ＲＸ、ＲＸＮ）に同相ノイズが重畳した場合でも、次段の電池監視ＩＣ１０＿２の起動検出回路１４は、起動信号を適切に検出することが可能となる。 As described above, according to the activation detection circuit 14 according to the present embodiment, when the potential of the input terminal T1 is higher than the potential of the input terminal T2, the signal level of the detection signal Sd detects the activation signal. When the potential of the input terminal T1 and the potential of the input terminal T2 are the same, or when the potential of the input terminal T2 is higher than the potential of the input terminal T1 after transitioning to the indicated high level, the signal level of the detection signal Sd is low. Maintain the level. Therefore, even when in-phase noise is superimposed on the start signals (TX, TXN, RX, RXN) supplied from the first-stage battery monitoring IC 10_1 to the next-stage battery monitoring IC 10_2 via the communication lines L3 and L4, the next-stage battery The activation detection circuit 14 of the monitoring IC 10_2 can appropriately detect the activation signal.

図５は、比較例に係る起動検出回路１４Ｘの構成を示す回路図である。起動検出回路１４Ｘは、入力端子Ｔ１１、Ｔ１２、ｎチャネル型のトランジスタＭ１１、Ｍ１２、ｐチャネル型のトランジスタＭ１３、Ｍ１４、インバータＡ１１、ラッチ回路Ｌａ、抵抗素子Ｒ１１、Ｒ１２、Ｒ１３、Ｒ１４、Ｒ１５を含んで構成されている。 FIG. 5 is a circuit diagram showing the configuration of the start detection circuit 14X according to the comparative example. The start detection circuit 14X includes input terminals T11, T12, n-channel transistors M11, M12, p-channel transistors M13, M14, an inverter A11, a latch circuit La, resistance elements R11, R12, R13, R14, and R15. It is composed of.

入力端子Ｔ１１及びＴ１２には、それぞれ通信線を介して起動信号が入力される。抵抗素子Ｒ１１は、一端が入力端子Ｔ１１に接続され、他端がＶＳＳラインに接続されている。抵抗素子Ｒ１２は、一端が入力端子Ｔ１２に接続され、他端が電圧ＶＳＳラインに接続されている。すなわち、入力端子Ｔ１１及びＴ１２は、プルダウンされている。 Start signals are input to the input terminals T11 and T12 via communication lines, respectively. One end of the resistance element R11 is connected to the input terminal T11, and the other end is connected to the VSS line. One end of the resistance element R12 is connected to the input terminal T12, and the other end is connected to the voltage VSS line. That is, the input terminals T11 and T12 are pulled down.

トランジスタＭ１１は、ゲートが入力端子Ｔ１１に接続され、ソースがＶＳＳラインに接続され、ドレインがトランジスタＭ１３のドレイン及びトランジスタＭ１４のゲートに接続されている。トランジスタＭ１２は、ゲートが入力端子Ｔ１２に接続され、ソースがＶＳＳラインに接続され、ドレインがトランジスタＭ１４のドレイン及びトランジスタＭ１３のゲートに接続されている。 In the transistor M11, the gate is connected to the input terminal T11, the source is connected to the VSS line, and the drain is connected to the drain of the transistor M13 and the gate of the transistor M14. In the transistor M12, the gate is connected to the input terminal T12, the source is connected to the VSS line, and the drain is connected to the drain of the transistor M14 and the gate of the transistor M13.

トランジスタＭ１３及びＭ１４は、それぞれ、ソースが抵抗素子Ｒ１３及びＲ１４を介してＶＣＣラインに接続されている。インバータＡ１１は、入力端がトランジスタＭ１２のドレインに接続されるとともに抵抗素子Ｒ１５を介してＶＣＣラインに接続され、出力端がラッチ回路Ｌａの入力端に接続されている。 The sources of the transistors M13 and M14 are connected to the VCS line via the resistance elements R13 and R14, respectively. The input end of the inverter A11 is connected to the drain of the transistor M12 and is connected to the VCS line via the resistance element R15, and the output end is connected to the input end of the latch circuit La.

比較例に係る起動検出回路１４Ｘにおいては、入力端子Ｔ１２にハイレベル、入力端子Ｔ１１にローレベルの起動信号が入力されると、インバータＡ１１の入力端がローレベル、出力端がハイレベルとなり、ラッチ回路Ｌａの出力端から出力される検出信号Ｓｄの信号レベルが、起動信号を検出したことを示すハイレベルとなる。 In the start detection circuit 14X according to the comparative example, when a high level start signal is input to the input terminal T12 and a low level start signal is input to the input terminal T11, the input end of the inverter A11 becomes low level and the output end becomes high level, and the latch The signal level of the detection signal Sd output from the output end of the circuit La becomes a high level indicating that the start signal has been detected.

図６Ａ及び図６Ｂは、本発明の実施形態に係る起動検出回路１４に代えて、比較例に係る起動検出回路１４Ｘを用いた電池監視システムの起動時における各部の電圧を示すタイミングチャートであり、図６Ａは、電池セル５０の接続ラインにノイズが発生していない場合を示し、図６Ｂは、電池セル５０の接続ラインにノイズが発生している場合を示している。 6A and 6B are timing charts showing the voltages of each part at the time of starting the battery monitoring system using the start detection circuit 14X according to the comparative example instead of the start detection circuit 14 according to the embodiment of the present invention. FIG. 6A shows a case where noise is not generated in the connection line of the battery cell 50, and FIG. 6B shows a case where noise is generated in the connection line of the battery cell 50.

図６Ａに示すように、電池セル５０の接続ラインにノイズが発生していない場合には、比較例に係る起動検出回路１４Ｘは、初段の電池監視ＩＣ１０＿１から受信した起動信号（ＲＸ、ＲＸＮ）に基づいて、適切なタイミングで検出信号Ｓｄの信号レベルをハイレベルに遷移させる。 As shown in FIG. 6A, when noise is not generated in the connection line of the battery cell 50, the start detection circuit 14X according to the comparative example uses the start signal (RX, RXN) received from the battery monitoring IC 10_1 of the first stage. Based on this, the signal level of the detection signal Sd is changed to a high level at an appropriate timing.

一方、図６Ｂに示すように、電池監視ＩＣ１０＿２においては、電池セル５０の接続ラインにノイズが発生している場合においても、起動検出回路１４Ｘの電源電圧として印加される電圧ＶＳＳ及び電圧ＶＣＣにはノイズが重畳されない。電池監視ＩＣ１０＿２において、電圧ＶＳＳは、接地電圧（ＧＮＤ）に固定され、電圧ＶＣＣは、ローパスフィルタ２０の出力信号だからである。一方、電池監視ＩＣ１０＿２の起動検出回路１４Ｘの入力端子Ｔ１１及びＴ１２には、通信線Ｌ３及びＬ４に重畳しているノイズが印加される。このような状況においては、入力端子Ｔ１１及びＴ１２にゲートが接続されたトランジスタＭ１１及びＭ１２が、入力端子Ｔ１１及びＴ１２に印加されたノイズによってオンオフし、トランジスタＭ１１のドレインの寄生容量Ｃｐ１及びトランジスタＭ１２のドレインの寄生容量Ｃｐ２が異なる場合（Ｃｐ１＜Ｃｐ２）には、トランジスタＭ１２のドレインの電圧レベルが、ハイレベルとローレベルとの間で振動し、これによってラッチ回路Ｌａから出力される検出信号Ｓｄのレベルが、ハイレベルに遷移して保持されてしまうおそれがある。すなわち、通信線Ｌ３、Ｌ４にノイズが重畳した場合に、次段の電池監視ＩＣ１０＿２の起動検出回路１４Ｘは、起動信号を誤検出してしまうおそれがある。 On the other hand, as shown in FIG. 6B, in the battery monitoring IC 10_2, even when noise is generated in the connection line of the battery cell 50, the voltage VSS and the voltage VCS applied as the power supply voltage of the start detection circuit 14X are Noise is not superimposed. This is because, in the battery monitoring IC 10_2, the voltage VSS is fixed to the ground voltage (GND), and the voltage VCS is the output signal of the low-pass filter 20. On the other hand, noise superimposed on the communication lines L3 and L4 is applied to the input terminals T11 and T12 of the start detection circuit 14X of the battery monitoring IC 10_2. In such a situation, the transistors M11 and M12 whose gates are connected to the input terminals T11 and T12 are turned on and off by the noise applied to the input terminals T11 and T12, and the parasitic capacitance Cp1 and the transistor M12 of the drain of the transistor M11 are turned on and off. When the parasitic capacitance Cp2 of the drain is different (Cp1 <Cp2), the voltage level of the drain of the transistor M12 vibrates between the high level and the low level, and the detection signal Sd output from the latch circuit La is caused by this. There is a risk that the level will transition to a high level and be retained. That is, when noise is superimposed on the communication lines L3 and L4, the start detection circuit 14X of the battery monitoring IC 10_2 in the next stage may erroneously detect the start signal.

一方、本発明の実施形態に係る起動検出回路１４によれば、上記のように、入力端子Ｔ１及びＴ２に同相ノイズが印加された場合でも、ダイオードＤ１はオフ状態を維持し、ラッチ回路Ｌａの入力端にハイレベルの電圧が印加されることはないので、通信線に重畳する同相ノイズによって検出信号Ｓｄの信号レベルがハイレベルに遷移するが防止される。 On the other hand, according to the start detection circuit 14 according to the embodiment of the present invention, the diode D1 maintains the off state even when the in-phase noise is applied to the input terminals T1 and T2 as described above, and the latch circuit La Since a high level voltage is not applied to the input end, the signal level of the detection signal Sd is prevented from transitioning to a high level due to the in-phase noise superimposed on the communication line.

次に、電池監視ＩＣ１０＿１及び１０＿２がそれぞれ、電池セル５０の電圧を測定し、測定結果をＭＣＵ２２に送信する場合の動作について説明する。 Next, the operation when the battery monitoring ICs 10_1 and 10_2 each measure the voltage of the battery cell 50 and transmit the measurement result to the MCU 22 will be described.

はじめに、ＭＣＵ２２が、電池監視ＩＣ１０＿１及び１０＿２に、電池セル５０の電圧測定を行うべき指令を出力する。この指令は、絶縁回路２４を介して、初段の電池監視ＩＣ１０＿１の第１の通信回路１７によって受信される。電池監視ＩＣ１０＿１の第１の通信回路１７は、受信した指令を制御回路１６に送信する。制御回路１６は、ＭＣＵ２２からの指令に基づいて、セル電圧測定回路１３に電池セル５０のセル電圧の測定を実行させる。また、制御回路１６は、ＭＣＵ２２からの指令を第２の通信回路１８に送信する。第２の通信回路１８は、ＭＣＵ２２からの指令を通信線Ｌ３及びＬ４を介して次段の電池監視ＩＣ１０＿２に送信する。 First, the MCU 22 outputs a command to the battery monitoring ICs 10_1 and 10_2 to measure the voltage of the battery cell 50. This command is received by the first communication circuit 17 of the battery monitoring IC 10_1 in the first stage via the insulation circuit 24. The first communication circuit 17 of the battery monitoring IC 10_1 transmits the received command to the control circuit 16. The control circuit 16 causes the cell voltage measuring circuit 13 to measure the cell voltage of the battery cell 50 based on the command from the MCU 22. Further, the control circuit 16 transmits a command from the MCU 22 to the second communication circuit 18. The second communication circuit 18 transmits a command from the MCU 22 to the battery monitoring IC 10_2 of the next stage via the communication lines L3 and L4.

初段の電池監視ＩＣ１０＿１から送信されたＭＣＵ２２からの指令は、次段の電池監視ＩＣ１０＿２の第１の通信回路１７によって受信される。電池監視ＩＣ１０＿２の第１の通信回路１７は、受信した指令を制御回路１６に送信する。制御回路１６は、ＭＣＵ２２からの指令に基づいて、セル電圧測定回路１３に電池セル５０のセル電圧の測定を実行させる。 The command from the MCU 22 transmitted from the first-stage battery monitoring IC 10_1 is received by the first communication circuit 17 of the next-stage battery monitoring IC 10_2. The first communication circuit 17 of the battery monitoring IC 10_2 transmits the received command to the control circuit 16. The control circuit 16 causes the cell voltage measuring circuit 13 to measure the cell voltage of the battery cell 50 based on the command from the MCU 22.

次段の電池監視ＩＣ１０＿２のセル電圧測定回路１３によって測定されたセル電圧の測定結果は、制御回路１６を介して第１の通信回路１７に送信される。次段の電池監視ＩＣ１０＿２の第１の通信回路１７は、セル電圧の測定結果を通信線Ｌ３及びＬ４を介して初段の電池監視ＩＣ１０＿１の第２の通信回路１８に送信する。 The measurement result of the cell voltage measured by the cell voltage measuring circuit 13 of the battery monitoring IC 10_2 in the next stage is transmitted to the first communication circuit 17 via the control circuit 16. The first communication circuit 17 of the battery monitoring IC 10_2 in the next stage transmits the measurement result of the cell voltage to the second communication circuit 18 of the battery monitoring IC 10_1 in the first stage via the communication lines L3 and L4.

初段の電池監視ＩＣ１０＿１の第２の通信回路１８は、次段の電池監視ＩＣ１０＿２から受信したセル電圧の測定結果を制御回路１６に送信する。制御回路１６は、次段の電池監視ＩＣ１０＿２から受信したセル電圧の測定結果を第１の通信回路１７に送信する。その後、制御回路１６は、電池監視ＩＣ１０＿１のセル電圧測定回路１３によって測定されたセル電圧の測定結果を第１の通信回路１７に送信する。第１の通信回路１７は、電池監視ＩＣ１０＿２のセル電圧測定回路１３によって測定されたセル電圧の測定結果、及び電池監視ＩＣ１０＿１のセル電圧測定回路１３によって測定されたセル電圧の測定結果を、通信線Ｌ１、Ｌ２及び絶縁回路２４を介してＭＣＵ２２に順次送信する。 The second communication circuit 18 of the first-stage battery monitoring IC 10_1 transmits the measurement result of the cell voltage received from the next-stage battery monitoring IC 10_2 to the control circuit 16. The control circuit 16 transmits the measurement result of the cell voltage received from the battery monitoring IC 10_2 of the next stage to the first communication circuit 17. After that, the control circuit 16 transmits the measurement result of the cell voltage measured by the cell voltage measuring circuit 13 of the battery monitoring IC 10_1 to the first communication circuit 17. The first communication circuit 17 transmits the measurement result of the cell voltage measured by the cell voltage measurement circuit 13 of the battery monitoring IC 10_2 and the measurement result of the cell voltage measured by the cell voltage measurement circuit 13 of the battery monitoring IC 10_1. It is sequentially transmitted to the MCU 22 via L1, L2 and the insulation circuit 24.

図７Ａ及び図７Ｂは、それぞれ、電池セル５０の接続ラインにノイズが発生していない場合における、初段の電池監視ＩＣ１０＿１から次段の電池監視ＩＣ１０＿２への信号伝送時における、電池監視ＩＣ１０＿１及び１０＿２の各部の電圧を示すタイミングチャートである。 7A and 7B show the battery monitoring ICs 10_1 and 10_2 at the time of signal transmission from the first-stage battery monitoring IC 10_1 to the next-stage battery monitoring IC 10_2 when no noise is generated in the connection line of the battery cell 50, respectively. It is a timing chart which shows the voltage of each part.

初段の電池監視ＩＣ１０＿１の第２の通信回路１８には、電池監視ＩＣ１０＿１に対応する電池セル群５１Ａにおける最も低電位側の電池セルの負極の電圧ＶＳＳ及びレギュレータ１５から出力される電圧ＶＤＤが電源電圧として供給される。従って、初段の電池監視ＩＣ１０＿１から送信される差動信号形式の送信信号ＴＸ、ＴＸＮにおけるハイレベルは、電圧ＶＤＤのレベルＶｄｄと同じレベルとなり、送信信号ＴＸ、ＴＸＮにおけるローレベルは、電圧ＶＳＳのレベルＶｓｓと同じレベルとなる。 In the second communication circuit 18 of the first stage battery monitoring IC 10_1, the voltage VSS of the negative electrode of the battery cell on the lowest potential side in the battery cell group 51A corresponding to the battery monitoring IC 10_1 and the voltage VDD output from the regulator 15 are the power supply voltage. Supplied as. Therefore, the high level of the differential signal type transmission signals TX and TXN transmitted from the battery monitoring IC 10_1 of the first stage is the same level as the level Vdd of the voltage VDD, and the low level of the transmission signals TX and TXN is the level of the voltage VSS. It will be the same level as Vss.

次段の電池監視ＩＣ１０＿２の第１の通信回路１７には、電池監視ＩＣ１０＿２に対応する電池セル群５１Ｂにおける最も高電位側の電池セルの正極の電圧ＶＣＣ１及び降圧回路１２から出力される電圧ＶＣＣ２が電源電圧として供給される。すなわち、電池監視ＩＣ１０＿２の第１の通信回路１７は、電池セル５０の接続ラインに直接接続されており、ローパスフィルタ２０を介さない電圧ＶＣＣ１及び電圧ＶＣＣ１から降圧した電圧ＶＣＣ２が、電源電圧として第１の通信回路１７に供給される。次段の電池監視ＩＣ１０＿２の第１の通信回路１７は、初段の電池監視ＩＣ１０＿１から送信される送信信号ＴＸ、ＴＸＮを、受信信号ＲＸ、ＲＸＮとして受信する。受信信号ＲＸ、ＲＸＮにおけるハイレベルは、電圧ＶＣＣ１のレベルＶｃｃ１と同じレベルとなり、受信信号ＲＸ、ＲＸＮにおけるローレベルは、電圧ＶＣＣ２のレベルＶｃｃ２と同じレベルとなる。送信信号ＴＸ、ＴＸＮ及び受信信号ＲＸ、ＲＸＮは同じ信号となるので、初段の電池監視ＩＣ１０＿１と次段の電池監視ＩＣ１０＿２との間で通信が可能となる。 In the first communication circuit 17 of the battery monitoring IC 10_2 in the next stage, the voltage VCS1 of the positive electrode of the battery cell on the highest potential side in the battery cell group 51B corresponding to the battery monitoring IC 10_2 and the voltage VCS2 output from the step-down circuit 12 are provided. It is supplied as a power supply voltage. That is, the first communication circuit 17 of the battery monitoring IC 10_2 is directly connected to the connection line of the battery cell 50, and the voltage VCS1 not passing through the low-pass filter 20 and the voltage VCS2 stepped down from the voltage VCS1 are the first power supply voltages. It is supplied to the communication circuit 17 of. The first communication circuit 17 of the battery monitoring IC 10_2 in the next stage receives the transmission signals TX and TXN transmitted from the battery monitoring IC 10_1 in the first stage as reception signals RX and RXN. The high level of the received signals RX and RXN is the same level as the level Vcc1 of the voltage VCS1, and the low level of the received signals RX and RXN is the same level as the level Vcc2 of the voltage VCS2. Since the transmission signals TX and TXN and the reception signals RX and RXN are the same signal, communication is possible between the battery monitoring IC 10_1 in the first stage and the battery monitoring IC 10_2 in the next stage.

図８Ａ及び図８Ｂは、電池セル５０の接続ラインにノイズが発生している場合における、初段の電池監視ＩＣ１０＿１から次段の電池監視ＩＣ１０＿２への信号伝送時における、電池監視ＩＣ１０＿１及び１０＿２の各部の電圧を示すタイミングチャートである。 8A and 8B show the parts of the battery monitoring ICs 10_1 and 10_2 when the signal is transmitted from the battery monitoring IC 10_1 of the first stage to the battery monitoring IC 10_2 of the next stage when noise is generated in the connection line of the battery cell 50. It is a timing chart which shows the voltage.

図８Ａに示すように、電池セル５０の接続ラインにノイズが発生した場合、電圧ＶＤＤ及び電圧ＶＳＳにもノイズが重畳し、電圧ＶＤＤ及び電圧ＶＳＳが電源電圧として供給される電池監視ＩＣ１０＿１の第２の通信回路１８から送信される送信信号ＴＸ、ＴＸＮ及び電池監視ＩＣ１０＿２の通信回路１７が受信する受信信号ＲＸ、ＲＸＮにもノイズが重畳する。なお、通信線Ｌ３及びＬ４に伝送される送信信号ＴＸ、ＴＸＮ及び受信信号ＲＸ、ＲＸＮに重畳するノイズは同相ノイズである。 As shown in FIG. 8A, when noise is generated in the connection line of the battery cell 50, the noise is also superimposed on the voltage VDD and the voltage VSS, and the voltage VDD and the voltage VSS are supplied as the power supply voltage of the second battery monitoring IC 10_1. Noise is also superimposed on the transmission signals TX and TXN transmitted from the communication circuit 18 and the reception signals RX and RXN received by the communication circuit 17 of the battery monitoring IC 10_2. The noise superimposed on the transmission signals TX and TXN and the reception signals RX and RXN transmitted on the communication lines L3 and L4 is in-phase noise.

図８Ｂに示すように、電池セル５０の接続ラインにノイズが発生した場合、次段の電池監視ＩＣ１０＿２の第１の通信回路１７の電源電圧として供給される電圧ＶＣＣ１及びＶＣＣ２にもノイズが重畳する。次段の電池監視ＩＣ１０＿２の通信回路１７が受信する受信信号ＲＸ、ＲＸＮに重畳するノイズ及び電圧ＶＣＣ１及びＶＣＣ２に重畳するノイズは、同相ノイズであるので、受信信号ＲＸ、ＲＸＮは、ノイズの振幅が大きくなった場合でも、電圧ＶＣＣ１のレベルＶｃｃ１及び電圧ＶＣＣ２のレベルＶｃｃ２でクランプされることがない。従って、送信信号ＴＸ、ＴＸＮにノイズが重畳した場合でも、次段の電池監視ＩＣ１０＿２の第１の通信回路１７において、ＴＸとＴＸＮの差分に相当する差動信号を、ＲＸとＲＸＮとの差分に相当する差動信号として、適切に受信することが可能となる。 As shown in FIG. 8B, when noise is generated in the connection line of the battery cell 50, the noise is also superimposed on the voltages VCS1 and VCS2 supplied as the power supply voltage of the first communication circuit 17 of the battery monitoring IC 10_2 in the next stage. .. Since the noise superimposed on the received signals RX and RXN and the noise superimposed on the voltages VCS1 and VCS2 received by the communication circuit 17 of the battery monitoring IC 10_2 in the next stage are in-phase noise, the noise amplitudes of the received signals RX and RXN are high. Even when it becomes large, it is not clamped at the level Vcc1 of the voltage VCS1 and the level Vcc2 of the voltage VCS2. Therefore, even when noise is superimposed on the transmission signals TX and TXN, in the first communication circuit 17 of the battery monitoring IC 10_2 in the next stage, the differential signal corresponding to the difference between TX and TXN is used as the difference between RX and RXN. It can be appropriately received as a corresponding differential signal.

図９は、比較例に係る電池監視ＩＣ１０＿１Ｘ及び１０＿２Ｘを備えた電池監視システム１Ｘの構成を示す回路ブロック図である。比較例に係る電池監視ＩＣ１０＿１Ｘ及び１０＿２Ｘは、ローパスフィルタ２０から出力される、ノイズ成分が除去された電圧ＶＣＣ及び昇圧回路１１から出力されるノイズ成分を含まない電圧ＶＵＰ（＞ＶＣＣ）が、電源電圧として第１の通信回路１７に供給される点が、本発明の実施形態に係る電池監視ＩＣ１０＿１及び１０＿２と異なる。 FIG. 9 is a circuit block diagram showing a configuration of a battery monitoring system 1X including the battery monitoring ICs 10_1X and 10_2X according to a comparative example. The battery monitoring ICs 10_1X and 10_2X according to the comparative example have a voltage VCC (> VCS) output from the low-pass filter 20 from which noise components have been removed and a voltage VUP (> VCS) not including noise components output from the booster circuit 11 as a power supply voltage. It is different from the battery monitoring ICs 10_1 and 10_2 according to the embodiment of the present invention in that it is supplied to the first communication circuit 17.

初段の電池監視ＩＣ１０＿１Ｘの第２の通信回路１８には、電池監視ＩＣ１０＿１Ｘに対応する電池セル群５１Ａにおける最も低電位側の電池セルの負極の電圧ＶＳＳ及びレギュレータ１５から出力される電圧ＶＤＤが電源電圧として供給される。従って、電池セル５０の接続ラインにノイズが発生していない場合、初段の電池監視ＩＣ１０＿１Ｘから送信される差動信号形式の送信信号ＴＸ、ＴＸＮにおけるハイレベルは、電圧ＶＤＤのレベルＶｄｄと同じレベルとなり、送信信号ＴＸ、ＴＸＮにおけるローレベルは、電圧ＶＳＳのレベルＶｓｓと同じレベルとなる。 In the second communication circuit 18 of the first stage battery monitoring IC 10_1X, the voltage VSS of the negative electrode of the battery cell on the lowest potential side in the battery cell group 51A corresponding to the battery monitoring IC 10_1X and the voltage VDD output from the regulator 15 are the power supply voltage. Supplied as. Therefore, when noise is not generated in the connection line of the battery cell 50, the high level of the differential signal type transmission signals TX and TXN transmitted from the battery monitoring IC 10_1X of the first stage is the same level as the level Vdd of the voltage VDD. , The low level in the transmission signals TX and TXN is the same level as the level Vss of the voltage VSS.

次段の電池監視ＩＣ１０＿２Ｘの第１の通信回路１７には、ローパスフィルタ２０から出力されるノイズ成分が除去された電圧ＶＣＣ及び昇圧回路１１から出力されるノイズ成分を含まない電圧ＶＵＰが電源電圧として供給される。次段の電池監視ＩＣ１０＿２Ｘの第１の通信回路１７は、初段の電池監視ＩＣ１０＿１Ｘから送信される送信信号ＴＸ、ＴＸＮを、受信信号ＲＸ、ＲＸＮとして受信する。電池セル５０の接続ラインにノイズが発生していない場合には、受信信号ＲＸ、ＲＸＮにおけるハイレベルは、電圧ＶＵＰのレベルＶｕｐと同じレベルとなり、受信信号ＲＸ、ＲＸＮにおけるローレベルは、電圧ＶＣＣのレベルＶｃｃと同じレベルとなる。電池セル５０の接続ラインにノイズが発生していない場合には、送信信号ＴＸ、ＴＸＮ及び受信信号ＲＸ、ＲＸＮは同じ信号となるので、初段の電池監視ＩＣ１０＿１Ｘの第２の通信回路１８と次段の電池監視ＩＣ１０＿２Ｘの第１の通信回路１７との間で通信が可能となる。このように、比較例に係る電池監視ＩＣ１０＿１Ｘ及び１０＿２Ｘにおいては、第１の通信回路１７には、ノイズ成分を含まない電源電圧が供給される一方、第２の通信回路１８には、ノイズ成分を含む電源電圧が供給される。 In the first communication circuit 17 of the battery monitoring IC 10_2X in the next stage, a voltage VCS in which the noise component output from the low-pass filter 20 is removed and a voltage VUP not including the noise component output from the booster circuit 11 are used as the power supply voltage. Be supplied. The first communication circuit 17 of the battery monitoring IC 10_2X in the next stage receives the transmission signals TX and TXN transmitted from the battery monitoring IC 10_1X in the first stage as reception signals RX and RXN. When no noise is generated in the connection line of the battery cell 50, the high level of the received signals RX and RXN is the same level as the level Vup of the voltage VUP, and the low level of the received signals RX and RXN is the voltage VCS. It becomes the same level as the level Vcc. When no noise is generated in the connection line of the battery cell 50, the transmission signals TX and TXN and the reception signals RX and RXN are the same signals, so that the second communication circuit 18 and the next stage of the battery monitoring IC 10_1X in the first stage Communication with the first communication circuit 17 of the battery monitoring IC 10_2X of the above is possible. As described above, in the battery monitoring ICs 10_1X and 10_2X according to the comparative example, the power supply voltage containing no noise component is supplied to the first communication circuit 17, while the noise component is supplied to the second communication circuit 18. The including power supply voltage is supplied.

図１０Ａ及び図１０Ｂは、比較例に係る電池監視システム１Ｘにおいて、電池セル５０の接続ラインにノイズが発生している場合における、初段の電池監視ＩＣ１０＿１Ｘから次段の電池監視ＩＣ１０＿２Ｘへの信号伝送時における、電池監視ＩＣ１０＿１Ｘ及び１０＿２Ｘの各部の電圧を示すタイミングチャートである。 10A and 10B show a signal transmission from the first-stage battery monitoring IC 10_1X to the next-stage battery monitoring IC 10_2X when noise is generated in the connection line of the battery cell 50 in the battery monitoring system 1X according to the comparative example. It is a timing chart which shows the voltage of each part of the battery monitoring IC 10_1X and 10_2X in the above.

図１０Ａに示すように、電池セル５０の接続ラインにノイズが発生した場合、電圧ＶＤＤ及び電圧ＶＳＳにもノイズが重畳し、電圧ＶＤＤ及び電圧ＶＳＳが電源電圧として供給される電池監視ＩＣ１０＿１Ｘの第２の通信回路１８から送信される送信信号ＴＸ、ＴＸＮにもノイズが重畳する。 As shown in FIG. 10A, when noise is generated in the connection line of the battery cell 50, the noise is also superimposed on the voltage VDD and the voltage VSS, and the voltage VDD and the voltage VSS are supplied as the power supply voltage of the second battery monitoring IC 10_1X. Noise is also superimposed on the transmission signals TX and TXN transmitted from the communication circuit 18 of the above.

一方、図１０Ｂに示すように、電池セル５０の接続ラインにノイズが発生した場合でも、次段の電池監視ＩＣ１０＿２Ｘの第１の通信回路１７の電源電圧として供給される電圧ＶＵＰ及び電圧ＶＣＣにはノイズが重畳されない。このような状況において、ノイズの振幅が大きくなった場合には、次段の電池監視ＩＣ１０＿２Ｘの第１の通信回路１７が受信する受信信号ＲＸ、ＲＸＮは、図１０Ｂに示すように、第１の通信回路１７の電源電圧である電圧ＶＣＣのレベルＶｃｃ及び電圧ＶＵＰのレベルＶｕｐでクランプされる。この場合、受信信号ＲＸとＲＸＮとの差分に相当する差動信号において、図１０Ｂにおいてハッチングで示す不定領域Ｚが発生し、電池監視ＩＣ１０＿１Ｘの第２の通信回路１８から送信された信号を、電池監視ＩＣ１０＿２Ｘの第１の通信回路１７において適切に受信することができなくなる。 On the other hand, as shown in FIG. 10B, even if noise is generated in the connection line of the battery cell 50, the voltage VUP and the voltage VCS supplied as the power supply voltage of the first communication circuit 17 of the battery monitoring IC 10_2X in the next stage Noise is not superimposed. In such a situation, when the noise amplitude becomes large, the received signals RX and RXN received by the first communication circuit 17 of the battery monitoring IC 10_2X in the next stage are the first ones as shown in FIG. 10B. It is clamped at the level Vcc of the voltage VCS, which is the power supply voltage of the communication circuit 17, and the level Vup of the voltage VUP. In this case, in the differential signal corresponding to the difference between the received signals RX and RXN, the indefinite region Z shown by hatching in FIG. 10B is generated, and the signal transmitted from the second communication circuit 18 of the battery monitoring IC 10_1X is transmitted to the battery. It becomes impossible to properly receive the signal in the first communication circuit 17 of the monitoring IC 10_2X.

このように、比較例に係る電池監視システム１Ｘにおいては、初段の電池監視ＩＣ１０＿１Ｘの第２の通信回路１８には、ノイズが重畳した電圧ＶＳＳ及び電圧ＶＤＤが電源電圧として供給され、次段の電池監視ＩＣ１０＿２Ｘの第１の通信回路１７には、ノイズが重畳していない電圧ＶＣＣ及び電圧ＶＵＰが電源電圧として供給される。これにより、ノイズの振幅が大きくなった場合に、電池監視ＩＣ１０＿２Ｘの第１の通信回路１７に供給される電源電圧のレベルＶｃｃ及びＶｕｐのレベルで、受信信号ＲＸ、ＲＸＮがクランプされ、電池監視ＩＣ１０＿１Ｘと電池監視ＩＣ１０＿２Ｘとの間での通信が不能となる場合がある。 As described above, in the battery monitoring system 1X according to the comparative example, the voltage VSS and the voltage VDD on which noise is superimposed are supplied as the power supply voltage to the second communication circuit 18 of the battery monitoring IC 10_1X in the first stage, and the battery in the next stage. A voltage VCS and a voltage VUP on which noise is not superimposed are supplied as a power supply voltage to the first communication circuit 17 of the monitoring IC 10_2X. As a result, when the noise amplitude becomes large, the received signals RX and RXN are clamped at the levels Vcc and Vup of the power supply voltage supplied to the first communication circuit 17 of the battery monitoring IC 10_2X, and the battery monitoring IC 10_1X Communication between the battery monitoring IC 10_2X and the battery monitoring IC 10_2X may become impossible.

一方、本発明の実施形態に係る電池監視システム１によれば、初段の電池監視ＩＣ１０＿１の第２の通信回路１８及び次段の電池監視ＩＣ１０＿２の第１の通信回路１７には、互いに同じノイズを含む電源電圧が印加されるように構成されているので、ノイズの振幅が大きくなった場合でも、次段の電池監視ＩＣ１０＿２の第１の通信回路１７において受信される受信信号ＲＸ、ＲＸＮが、当該第１の通信回路１７に供給される電源電圧の電圧レベルでクランプされることはなく、電池監視ＩＣ１０＿１の第２の通信回路１８と電池監視ＩＣ１０＿２の第１の通信回路１７との間での通信を良好に保つことが可能となる。 On the other hand, according to the battery monitoring system 1 according to the embodiment of the present invention, the same noise is generated in the second communication circuit 18 of the first stage battery monitoring IC 10_1 and the first communication circuit 17 of the next stage battery monitoring IC 10_2. Since the power supply voltage including the voltage is applied, even if the noise amplitude becomes large, the received signals RX and RXN received in the first communication circuit 17 of the battery monitoring IC 10_2 in the next stage are the same. It is not clamped by the voltage level of the power supply voltage supplied to the first communication circuit 17, and communication between the second communication circuit 18 of the battery monitoring IC 10_1 and the first communication circuit 17 of the battery monitoring IC 10_2. Can be kept good.

なお、上記の説明では、初段の電池監視ＩＣ１０＿１の第２の通信回路１８から送信された信号を、次段の電池監視ＩＣ１０＿２の第１の通信回路１７が受信する場合について説明したが、次段の電池監視ＩＣ１０＿２の第１の通信回路１７から送信された信号を、初段の電池監視ＩＣ１０＿１の第２の通信回路１８が受信する場合においても、同様の効果を得ることができる。 In the above description, the case where the first communication circuit 17 of the battery monitoring IC 10_2 of the next stage receives the signal transmitted from the second communication circuit 18 of the battery monitoring IC 10_1 of the first stage has been described. The same effect can be obtained even when the signal transmitted from the first communication circuit 17 of the battery monitoring IC 10_1 of the first stage is received by the second communication circuit 18 of the battery monitoring IC 10_1 of the first stage.

また、本実施形態では、降圧回路１２から出力される電圧ＶＣＣ２を第１の通信回路１７の電源電圧として供給する場合を例示したが、昇圧回路から出力される電圧を第１の通信回路１７の電源電圧として供給してもよい。この場合、昇圧回路から出力される電圧に電池セル５０の接続ラインに発生するノイズと同相のノイズが重畳されるようにローパスフィルタ２０を介さない電圧が昇圧回路に入力される。 Further, in the present embodiment, the case where the voltage VCC2 output from the step-down circuit 12 is supplied as the power supply voltage of the first communication circuit 17 is illustrated, but the voltage output from the booster circuit 17 is supplied to the first communication circuit 17. It may be supplied as a power supply voltage. In this case, a voltage that does not pass through the low-pass filter 20 is input to the booster circuit so that noise in phase with the noise generated in the connection line of the battery cell 50 is superimposed on the voltage output from the booster circuit.

なお、電池監視システム１は、本発明における電池監視システムの一例である。電池監視ＩＣ１０＿１及び１０＿２は、本発明における半導体装置の一例である。起動検出回路１４は、本発明における起動検出回路の一例である。降圧回路１２は、本発明における第１の電源回路の一例である。レギュレータ１５は、本発明における第２の電源回路の一例である。第１の通信回路１７は、本発明における第１の通信回路の一例である。第２の通信回路１８は、本発明における第２の通信回路の一例である。 The battery monitoring system 1 is an example of the battery monitoring system in the present invention. The battery monitoring ICs 10_1 and 10_2 are examples of the semiconductor device in the present invention. The activation detection circuit 14 is an example of the activation detection circuit in the present invention. The step-down circuit 12 is an example of the first power supply circuit in the present invention. The regulator 15 is an example of the second power supply circuit in the present invention. The first communication circuit 17 is an example of the first communication circuit in the present invention. The second communication circuit 18 is an example of the second communication circuit in the present invention.

１ 電池監視システム
１０＿１、１０＿２ 電池監視ＩＣ
１１ 昇圧回路
１２ 降圧回路
１３ セル電圧測定回路
１４ 起動検出回路
１５ レギュレータ
１６ 制御回路
１７ 第１の通信回路
１８ 第２の通信回路
１９ スイッチ回路
２０ ローパスフィルタ
３１ 整流部
３２ 電圧発生部
３３ 出力部
５０ 電池セル
Ｌ１、Ｌ２、Ｌ３、Ｌ４ 通信線
Ｒ１、Ｒ２、Ｒ３、Ｒ４ 抵抗素子
Ａ１、Ａ２ インバータ
Ｄ１ ダイオード
Ｍ１ トランジスタ
Ｌａ ラッチ回路
Ｔ１、Ｔ２ 入力端子 1 Battery monitoring system 10_1, 10_2 Battery monitoring IC
11 Booster circuit 12 Step-down circuit 13 Cell voltage measurement circuit 14 Start detection circuit 15 Regulator 16 Control circuit 17 First communication circuit 18 Second communication circuit 19 Switch circuit 20 Low-pass filter 31 Rectifier 32 Voltage generator 33 Output section 50 Battery Cell L1, L2, L3, L4 Communication line R1, R2, R3, R4 Resistance element A1, A2 Inverter D1 Diode M1 Transistor La Latch circuit T1, T2 Input terminal

Claims (10)

差動伝送線路を構成する一対の第１の通信線を介して供給される起動信号を検出した場合に検出信号を出力する起動検出回路と、
前記起動検出回路から前記検出信号が出力された場合にそれぞれ起動される第１の電源回路及び第２の電源回路と、
前記第１の通信線に接続され、前記第１の電源回路から電源電圧の供給を受ける第１の通信回路と、
前記第２の電源回路から電源電圧の供給を受けて起動した場合に前記起動信号を、差動伝送線路を構成する一対の第２の通信線に送出する第２の通信回路と、
を含み、
前記起動検出回路は、
前記第１の通信線に接続される第１の入力端子及び第２の入力端子と、
前記第１の入力端子と前記第２の入力端子との間に設けられ、前記第１の入力端子の電位が前記第２の入力端子の電位よりも高い場合に電流を発生させる整流部と、
前記電流が発生した場合に電圧を発生させる電圧発生部と、
前記電圧の発生に応じて前記検出信号を出力する出力部と、
を含む半導体装置。 A start-up detection circuit that outputs a detection signal when a start-up signal supplied via a pair of first communication lines constituting a differential transmission line is detected, and a start-up detection circuit.
A first power supply circuit and a second power supply circuit that are activated when the detection signal is output from the activation detection circuit, respectively.
A first communication circuit connected to the first communication line and supplied with a power supply voltage from the first power supply circuit, and a first communication circuit.
A second communication circuit that sends the start signal to a pair of second communication lines constituting a differential transmission line when the power supply voltage is supplied from the second power supply circuit to start the operation.
Including
The start detection circuit is
The first input terminal and the second input terminal connected to the first communication line,
A rectifying unit provided between the first input terminal and the second input terminal and generating a current when the potential of the first input terminal is higher than the potential of the second input terminal.
A voltage generating part that generates a voltage when the current is generated, and
An output unit that outputs the detection signal in response to the generation of the voltage,
Semiconductor devices including. 前記整流部は、第１の抵抗素子と、前記第１の抵抗素子に接続されたダイオードと、を含み、
前記電圧発生部は、前記第１の抵抗素子と前記ダイオードとの接続点にゲートが接続されたトランジスタと、前記トランジスタに接続された第２の抵抗素子と、を含み、
前記出力部は、前記検出信号の信号レベルを保持するラッチ回路を含む
請求項１に記載の半導体装置。 The rectifying unit includes a first resistance element and a diode connected to the first resistance element.
The voltage generating unit includes a transistor in which a gate is connected to a connection point between the first resistance element and the diode, and a second resistance element connected to the transistor.
The semiconductor device according to claim 1, wherein the output unit includes a latch circuit that holds a signal level of the detection signal. 前記検出信号が出力された場合に起動される電源回路から電源電圧の供給を受け、電池セルの電圧を測定するセル電圧測定回路を更に含む
請求項１または請求項２に記載の半導体装置。 The semiconductor device according to claim 1 or 2, further comprising a cell voltage measuring circuit that receives a power supply voltage from a power supply circuit that is activated when the detection signal is output and measures the voltage of the battery cell. 前記第１の電源回路及び前記第２の電源回路は、それぞれ、前記電池セルから電圧の供給を受ける
請求項３に記載の半導体装置。 The semiconductor device according to claim 3, wherein the first power supply circuit and the second power supply circuit each receive a voltage supply from the battery cell. 直列接続された複数の電池セルの各々の状態を監視する、第１の半導体装置及び第２の半導体装置を含む電池監視システムであって、
前記第１の半導体装置及び前記第２の半導体装置は、それぞれ、
差動伝送線路を構成する一対の第１の通信線を介して供給される起動信号を検出した場合に検出信号を出力する起動検出回路と、
前記起動検出回路から前記検出信号が出力された場合にそれぞれ起動される第１の電源回路及び第２の電源回路と、
前記第１の通信線に接続され、前記第１の電源回路から電源電圧の供給を受ける第１の通信回路と、
前記第２の電源回路から電源電圧の供給を受けて起動した場合に前記起動信号を、差動伝送線路を構成する一対の第２の通信線に送出する第２の通信回路と、
前記検出信号が出力された場合に起動される電源回路から電源電圧の供給を受け、前記複数の電池セルのうちの対応する電池セルの電圧を測定するセル電圧測定回路と、
を含み、
前記第１の半導体装置の前記第２の通信回路と、前記第２の半導体装置の前記第１の通信回路とが通信線を介して接続され、
前記起動検出回路は、
前記第１の通信線に接続される第１の入力端子及び第２の入力端子と、
前記第１の入力端子と前記第２の入力端子との間に設けられ、前記第１の入力端子の電位が前記第２の入力端子の電位よりも高い場合に電流を発生させる整流部と、
前記電流が発生した場合に電圧を発生させる電圧発生部と、
前記電圧の発生に応じて前記検出信号を出力する出力部と、
を含む電池監視システム。 A battery monitoring system including a first semiconductor device and a second semiconductor device that monitors the state of each of a plurality of battery cells connected in series.
The first semiconductor device and the second semiconductor device are each
A start-up detection circuit that outputs a detection signal when a start-up signal supplied via a pair of first communication lines constituting a differential transmission line is detected, and a start-up detection circuit.
A first power supply circuit and a second power supply circuit that are activated when the detection signal is output from the activation detection circuit, respectively.
A first communication circuit connected to the first communication line and supplied with a power supply voltage from the first power supply circuit, and a first communication circuit.
A second communication circuit that sends the start signal to a pair of second communication lines constituting a differential transmission line when the power supply voltage is supplied from the second power supply circuit to start the operation.
A cell voltage measuring circuit that receives power supply voltage from a power supply circuit that is activated when the detection signal is output and measures the voltage of the corresponding battery cell among the plurality of battery cells.
Including
The second communication circuit of the first semiconductor device and the first communication circuit of the second semiconductor device are connected via a communication line.
The start detection circuit is
The first input terminal and the second input terminal connected to the first communication line,
A rectifying unit provided between the first input terminal and the second input terminal and generating a current when the potential of the first input terminal is higher than the potential of the second input terminal.
A voltage generating part that generates a voltage when the current is generated, and
An output unit that outputs the detection signal in response to the generation of the voltage,
Battery monitoring system including. 差動伝送線路を構成する一対の通信線を介して供給される起動信号を検出した場合に、検出信号を出力する起動検出回路における前記起動信号の検出方法であって、
前記通信線に接続される第１の入力端子及び第２の入力端子のうち、前記第１の入力端子の電位が前記第２の入力端子の電位よりも大きい場合に電流を発生させ、前記第１の入力端子の電位が前記第２の入力端子の電位以下の場合に前記電流を発生させず、前記電流の発生に伴って発生する電圧に基づいて前記検出信号を出力する
検出方法。 A method for detecting a start-up signal in a start-up detection circuit that outputs a detection signal when a start-up signal supplied via a pair of communication lines constituting a differential transmission line is detected.
Of the first input terminal and the second input terminal connected to the communication line, when the potential of the first input terminal is larger than the potential of the second input terminal, a current is generated to generate the first. A detection method in which the current is not generated when the potential of the input terminal 1 is equal to or lower than the potential of the second input terminal, and the detection signal is output based on the voltage generated with the generation of the current. 電池セルから電圧の供給を受け、第１の電源電圧を出力する第１の電源回路と、
前記第１の電源電圧の供給を受け、差動信号によって外部と通信を行う第１の通信回路と、
前記電池セルから電圧の供給を受け、前記第１の電源電圧の電圧レベルとは異なる電圧レベルの第２の電源電圧を出力する第２の電源回路と、
前記第２の電源電圧の供給を受け、差動信号によって外部と通信を行う第２の通信回路と、
を含む半導体装置。 A first power supply circuit that receives voltage from the battery cell and outputs the first power supply voltage,
A first communication circuit that receives the supply of the first power supply voltage and communicates with the outside by a differential signal.
A second power supply circuit that receives a voltage supply from the battery cell and outputs a second power supply voltage having a voltage level different from that of the first power supply voltage.
A second communication circuit that receives the supply of the second power supply voltage and communicates with the outside by a differential signal.
Semiconductor devices including. 前記第１の電源回路は、前記電池セルの端子電圧を降圧する降圧回路を含む
請求項７に記載の半導体装置。 The semiconductor device according to claim 7, wherein the first power supply circuit includes a step-down circuit that steps down the terminal voltage of the battery cell. 前記電池セルの電圧を測定するセル電圧測定回路を更に含む
請求項７または請求項８に記載の半導体装置。 The semiconductor device according to claim 7 or 8, further comprising a cell voltage measuring circuit for measuring the voltage of the battery cell. 直列接続された複数の電池セルの各々の状態を監視する、第１の半導体装置及び第２の半導体装置を含む電池監視システムであって、
前記第１の半導体装置及び前記第２の半導体装置は、それぞれ、
電池セルから電圧の供給を受け、第１の電源電圧を出力する第１の電源回路と、
前記第１の電源電圧の供給を受け、差動信号によって外部と通信を行う第１の通信回路と、
前記電池セルから電圧の供給を受け、前記第１の電源電圧の電圧レベルとは異なる電圧レベルの第２の電源電圧を出力する第２の電源回路と、
前記第２の電源電圧の供給を受け、差動信号によって外部と通信を行う第２の通信回路と、
前記複数の電池セルのうち、対応する電池セルの電圧を測定するセル電圧測定回路と、
を含み、
前記第１の半導体装置の前記第２の通信回路と、前記第２の半導体装置の前記第１の通信回路とが差動伝送線路を構成する一対の通信線を介して接続されている
電池監視システム。 A battery monitoring system including a first semiconductor device and a second semiconductor device that monitors the state of each of a plurality of battery cells connected in series.
The first semiconductor device and the second semiconductor device are each
A first power supply circuit that receives voltage from the battery cell and outputs the first power supply voltage,
A first communication circuit that receives the supply of the first power supply voltage and communicates with the outside by a differential signal.
A second power supply circuit that receives a voltage supply from the battery cell and outputs a second power supply voltage having a voltage level different from that of the first power supply voltage.
A second communication circuit that receives the supply of the second power supply voltage and communicates with the outside by a differential signal.
A cell voltage measuring circuit that measures the voltage of the corresponding battery cell among the plurality of battery cells, and a cell voltage measuring circuit.
Including
Battery monitoring in which the second communication circuit of the first semiconductor device and the first communication circuit of the second semiconductor device are connected via a pair of communication lines constituting a differential transmission line. system.
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