JP7343333B2 - 電力変換装置 - Google Patents
電力変換装置 Download PDFInfo
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- JP7343333B2 JP7343333B2 JP2019154925A JP2019154925A JP7343333B2 JP 7343333 B2 JP7343333 B2 JP 7343333B2 JP 2019154925 A JP2019154925 A JP 2019154925A JP 2019154925 A JP2019154925 A JP 2019154925A JP 7343333 B2 JP7343333 B2 JP 7343333B2
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- 229910010271 silicon carbide Inorganic materials 0.000 description 1
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- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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Description
ここで、電流検出用MOSFET49のソース端子49sとバッテリ21の負極の間には、主電流検出部51が設けられている。主電流検出部51は、少なくとも、電流測定部52、測定電圧切換部53、及び主電流温度補正部54から構成されている。ここで、主電流温度補正部54は、マイクロコンピュータに内蔵された変換テーブルを使用したテーブル変換処理によって温度補正を行なう機能を備えている。
Vref=Rb*Ib…(1)
Vo=Rb*Ib+Rref*Ib…(2)
ここで(1)式から、Ib=Vref/Rbとなる。
次に、(2)式は以下のように表される。
Vo=Vref+Rref*Vref/Rb
そして、温度変化によって生じる測定電圧(Vref)からの出力電圧の差分(ΔV)は、
ΔV=Vo-Vref=Vref*Rref/Rb…(3)
となる。
Claims (13)
- パワーデバイスに流れる電流を推定する電流検出部を備えた電力変換装置において、
前記パワーデバイスは、電気抵抗が温度依存性を有する半導体基板に形成された少なくとも、主制御素子と電流センス素子からなると共に、前記主制御素子のドレイン端子と前記電流センス素子のドレイン端子とが接続されており、
前記電流検出部は、前記主制御素子のゲート端子、及び前記電流センス素子のゲート端子に与えられるゲート信号によって前記主制御素子、及び前記電流センス素子が共にオフされている状態で、前記主制御素子と前記電流センス素子のソース端子の間に所定の測定電圧を印加し、この時の前記主制御素子と前記電流センス素子の夫々の前記ソース端子の間の前記半導体基板に流れる電流から前記パワーデバイスの温度を推定する
ことを特徴とする電力変換装置。 - 請求項1に記載の電力変換装置において、
前記主制御素子はMOSFET(以下、制御用MOSFETと表記する)から形成され、前記電流センス素子はMOSFET(以下、電流検出用MOSFETと表記する)から形成され、
前記制御用MOSFETの前記ソース端子と、前記電流検出用MOSFETの前記ソース端子は、前記半導体基板によって形成された温度依存性抵抗(以下、ボディ抵抗と表記する)によって接続されている
ことを特徴とする電力変換装置。 - 請求項2に記載の電力変換装置において、
前記ボディ抵抗は、前記制御用MOSFETの前記ソース端子が接続されたP層と、前記電流検出用MOSFETの前記ソース端子が接続されたP層から形成されており、夫々の前記P層は共通のP層である
ことを特徴とする電力変換装置。 - 請求項2に記載の電力変換装置において、
前記電流検出部は、前記制御用MOSFETの前記ゲート端子と前記電流検出用MOSFETの前記ゲート端子に与えられる前記ゲート信号に対応して、電流検出モードと温度検出モードを実行し、
前記ゲート信号がオフ状態の前記温度検出モードでは、前記電流検出部は前記ボディ抵抗を流れる電流に基づいて前記パワーデバイスの温度を推定し、
前記ゲート信号がオン状態の前記電流検出モードでは、前記電流検出部は前記電流検出用MOSFETを流れるセンス電流と前記パワーデバイスの前記温度に基づいて前記制御用MOSFETを流れる主電流を推定する
ことを特徴とする電力変換装置。 - 請求項4に記載の電力変換装置において、
前記制御用MOSFETと前記電流検出用MOSFETがオフされる前記温度検出モードに対応して、前記測定電圧が前記電流検出用MOSFETの前記ソース端子に印加される
ことを特徴とする電力変換装置。 - 請求項4に記載の電力変換装置において、
前記電流検出用MOSFETの前記ソース端子には電流測定部が接続され、更に前記電流測定部には測定電圧を印可する測定電圧切換部が接続されており、
前記電流測定部は、演算増幅器、及び前記演算増幅器の出力部と反転入力(-)側とを接続する並列抵抗からなり、
前記演算増幅器の前記反転入力(-)側は前記電流検出用MOSFETの前記ソース端子に接続され、前記演算増幅器の非反転入力(+)側は前記測定電圧切換部に接続されて前記測定電圧が印加される
ことを特徴とする電力変換装置。 - 請求項6に記載の電力変換装置において、
前記演算増幅器の前記出力部には、前記温度検出モードにおける前記ボディ抵抗を流れる電流に基づいた第1の出力電圧が出力され、前記電流検出モードにおける前記電流検出用MOSFETを流れる電流に基づいた第2の出力電圧が出力され、
更に、前記電流検出部は主電流温度補正部を備え、前記主電流温度補正部に前記第1の出力電圧と前記第2の出力電圧が入力され、
前記主電流温度補正部は、前記第1の出力電圧から前記パワーデバイスの前記温度を推定し、前記第2の出力電圧から前記電流検出用MOSFETを流れるセンス電流を推定し、前記温度と前記センス電流に基づいて前記制御用MOSFETを流れる前記主電流を推定する
ことを特徴とする電力変換装置。 - 請求項7に記載の電力変換装置において、
前記パワーデバイスの前記温度は、前記第1の出力電圧と前記温度の関係を表す変換特性を備えた電圧/温度変換テーブルを用いて推定され、
前記電流検出用MOSFETを流れる前記センス電流は、前記第2の出力電圧と前記センス電流の関係を表す変換特性を備えた電圧/電流変換テーブルを用いて推定される
ことを特徴とする電力変換装置。 - パワーデバイスに流れる電流を推定する電流検出部を備えた電力変換装置において、
前記パワーデバイスは、電気抵抗が温度依存性を有する半導体基板に形成された少なくとも、主制御素子と電流センス素子からなると共に、前記主制御素子のドレイン端子と前記電流センス素子のドレイン端子とが接続されており、
前記電流検出部は、前記主制御素子のゲート端子、及び前記電流センス素子のゲート端子に与えられるゲート信号によって前記主制御素子、及び前記電流センス素子が共にオフされている状態で、前記主制御素子と前記電流センス素子のソース端子の間の前記半導体基板に定電流源から所定の定電流を流し、この時の前記主制御素子と前記電流センス素子の夫々の前記ソース端子の間の端子電圧から前記パワーデバイスの温度を推定する
ことを特徴とする電力変換装置。 - 請求項9に記載の電力変換装置において、
前記主制御素子はMOSFET(以下、制御用MOSFETと表記する)から形成され、前記電流センス素子はMOSFET(以下、電流検出用MOSFETと表記する)から形成され、
前記制御用MOSFETの前記ソース端子と、前記電流検出用MOSFETの前記ソース端子は、前記半導体基板によって形成された温度依存性抵抗(以下、ボディ抵抗と表記する)によって接続されている
ことを特徴とする電力変換装置。 - 請求項10に記載の電力変換装置において、
前記電流検出部は、前記制御用MOSFETの前記ゲート端子と前記電流検出用MOSFETの前記ゲート端子に与えられる前記ゲート信号に対応して、電流検出モードと温度検出モードを実行し、
前記ゲート信号がオフ状態の前記温度検出モードでは、前記電流検出部は前記ボディ抵抗と、前記ボディ抵抗を流れる前記定電流から定まる前記端子電圧に基づいて前記パワーデバイスの温度を推定し、
前記ゲート信号がオン状態の前記電流検出モードでは、前記電流検出部は前記電流検出用MOSFETを流れるセンス電流と前記パワーデバイスの前記温度に基づいて前記制御用MOSFETを流れる主電流を推定する
ことを特徴とする電力変換装置。 - 請求項11に記載の電力変換装置において、
前記電流検出用MOSFETの前記ソース端子には、前記定電流源と電流測定部が電流切換部を介して接続されており、
前記ゲート信号のオフ状態に対応して前記電流切換部が、前記電流検出用MOSFETの前記ソース端子と前記定電流源とを導通とし、且つ前記電流検出用MOSFETの前記ソース端子と前記電流測定部とを不導通としている時は、前記電流検出用MOSFETと前記制御用MOSFETの夫々の前記ソース端子の間の電圧が前記端子電圧として出力され、
前記ゲート信号のオン状態に対応して前記電流切換部が、前記電流検出用MOSFETの前記ソース端子と前記定電流源とを不導通とし、且つ前記電流検出用MOSFETの前記ソース端子と前記電流測定部とを導通としている時は、前記電流測定部によって前記電流検出用MOSFETに流れるセンス電流に基づいた電圧が出力電圧として出力され、
更に、前記電流検出部は主電流温度補正部を備え、前記主電流温度補正部には前記端子電圧と前記出力電圧が入力され、
前記主電流温度補正部は、前記端子電圧から前記パワーデバイスの前記温度を推定し、前記出力電圧から前記電流検出用MOSFETを流れるセンス電流を推定し、前記温度と前記センス電流に基づいて前記制御用MOSFETを流れる前記主電流を推定する
ことを特徴とする電力変換装置。 - 請求項12に記載の電力変換装置において、
前記パワーデバイスの前記温度は、前記端子電圧と前記温度の関係を表す変換特性を備えた電圧/温度変換テーブルを用いて推定され、
前記電流検出用MOSFETを流れる前記センス電流は、前記出力電圧と前記センス電流の関係を表す変換特性を備えた電圧/電流変換テーブルを用いて推定される
ことを特徴とする電力変換装置。
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