JP2020120472A - Dcdcコンバータの制御装置 - Google Patents
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Abstract
Description
以下、本発明を具体化した第1実施形態を図面に基づいて説明する。図1は、本実施形態に係る電力変換システム100の構成図である。電力変換システム100は、車両に搭載されている。また、電力変換システム100が搭載される車両は、例えば、走行動力源として、内燃機関であるエンジンと、走行用のモータ260とを備えるハイブリット車両である。
図6に示すように、操作部70は、リアクトル電流ILrの極性に基づいて、昇圧制御と降圧制御との間の制御の切り換わりを判定してもよい。
第4配線LP4に電流センサ22が設けられていてもよい。
第2実施形態では、第1実施形態と異なる構成を主に説明する。なお、第1実施形態と同一の符号を付した構成は同一の構成を示し、その説明は繰り返さない。
第3実施形態では、第1実施形態と異なる構成を主に説明する。なお、第1実施形態と同一の符号を付した構成は同一の構成を示し、その説明は繰り返さない。
m1=VL/L … (1)
m2=(VL−VH)/L … (2)
リアクトル電流ILrの減少時の傾きm2が大きくなるほど、時比率が高くなるため、昇圧制御時において、第1,第2スイッチSW1,SW2が低周波発振しないための傾きMs条件は、下記式(3)の条件を満たせばよい。
m2/2≦Ms≦m2 … (3)
昇圧制御時では、第1,第2補償部55,65は、第1電圧センサ21により検出された高圧側電圧VHと、第2電圧センサ23により検出された低圧側電圧VLとを用いて、上記式(3)を満たすスロープ補償信号Slopeの傾きMsを算出する。
m3=−(VL−VH)/L … (4)
m4=−VL/L … (5)
降圧制御時において、第1,第2スイッチSW1,SW2が低周波発振しないための傾きMsの条件は、下記式(6)の条件を満たせばよい。
m4/2≦Ms≦m4 … (6)
降圧制御時では、第1,第2補償部55,65は、第2電圧センサ23により検出された低圧側電圧VLを用いて、上記式(6)を満たすスロープ補償信号Slopeの傾きMsを算出する。
図11に示すように、第1補償部55は、指令電流IL*にスロープ補償信号Slopeを加算することにより指令電流IL*を補償し、第2補償部65は、指令電流IL*にスロープ補償信号Slopeを減算することにより、指令電流IL*補償してもよい。
第4実施形態では、第1実施形態と異なる構成を主に説明する。なお、第1実施形態と同一の符号を付した構成は同一の構成を示し、その説明は繰り返さない。
第5実施形態では、第1実施形態と異なる構成を主に説明する。なお、第1実施形態と同一の符号を付した構成は同一の構成を示し、その説明は繰り返さない。
・第5実施形態において、第1,第2の電力授受対象としては、蓄電池に限らない。
Claims (5)
- 第1スイッチ(SW1,SWA)、第2スイッチ(SW2,SWB)、リアクトル(13,130a,130b)、低圧側端子(TL1,TL2)及び高圧側端子(TH1,TH1)を備え、
前記第1スイッチのオン操作によって前記低圧側端子からの電流を前記リアクトルに供給し、前記第1スイッチのオフ操作によって前記リアクトルに蓄積されたエネルギを放出させることにより、前記低圧側端子から供給される直流電圧を昇圧して前記高圧側端子から出力する昇圧制御と、
前記第2スイッチのオン操作によって前記高圧側端子からの電流を前記リアクトルに供給し、前記第2スイッチのオフ操作によって前記リアクトルに蓄積されたエネルギを放出させることにより、前記高圧側端子から供給される直流電圧を降圧して前記低圧側端子から出力する降圧制御と、を行うDCDCコンバータ(10)に適用されるDCDCコンバータの制御装置(30)であって、
前記低圧側端子から前記高圧側端子の向きで前記リアクトルに流れる電流の極性を正極性とし、前記高圧側端子から前記低圧側端子の向きで前記リアクトルに流れる電流の極性を負極性とし、
前記リアクトルに流れる電流値であるリアクトル電流を取得する電流取得部と、
前記昇圧制御が実施される期間では、正の指令電流を出力し、前記降圧制御が実施される期間では、負の指令電流を出力する指令値出力部(31)と、
前記第1スイッチの1スイッチング周期において、取得された前記リアクトル電流が正の前記指令電流に到達するまでは、前記第1スイッチのオン指令を出力し、取得された前記リアクトル電流が正の前記指令電流に到達した場合は、前記第1スイッチのオフ指令を出力する第1制御部(50)と、
前記第2スイッチの1スイッチング周期において、取得された前記リアクトル電流が負の前記指令電流に到達するまでは、前記第2スイッチのオン指令を出力し、取得された前記リアクトル電流が負の前記指令電流に到達した場合は、前記第2スイッチのオフ指令を出力する第2制御部(60)と、
前記昇圧制御が実施される期間であると判定した場合、前記第1制御部及び前記第2制御部のうち前記第1制御部からの前記オン指令又は前記オフ指令を選択し、選択した前記オン指令又は前記オフ指令により前記第1スイッチをオンオフ操作し、前記降圧制御が実施される期間であると判定した場合、前記第1制御部及び前記第2制御部のうち前記第2制御部からの前記オン指令又は前記オフ指令を選択し、選択した前記オン指令又は前記オフ指令により前記第2スイッチをオンオフ操作する操作部(70)と、
を備えるDCDCコンバータの制御装置。 - 前記第1スイッチの1スイッチング周期と前記第2スイッチの1スイッチング周期とが同じ周期であり、
前記第2制御部は、前記第2スイッチのオン指令を、前記第1制御部による前記第1スイッチのオン指令よりも1スイッチング周期の1/2だけずれたタイミングで出力する請求項1に記載のDCDCコンバータの制御装置。 - 前記低圧側端子に供給される直流電圧である低圧側電圧を取得する第1電圧取得部と、
前記高圧側端子に供給される直流電圧である高圧側電圧を取得する第2電圧取得部と、
前記昇圧制御が実施される期間において、取得された前記低圧側電圧と取得された前記高圧側電圧とに基づいて、前記指令電流を補償するスロープ補償信号を算出し、前記降圧制御が実施される期間において、取得された前記低圧側電圧に基づいて、前記スロープ補償信号を算出する補償信号算出部(55,65)と、を備え、
前記第1制御部及び前記第2制御部は、算出された前記スロープ補償信号を用いて、前記指令電流を補償する請求項1又は2に記載のDCDCコンバータの制御装置。 - 前記操作部は、前記指令値出力部から正の前記指令電流が入力された場合に、前記昇圧制御が実施されていると判定し、前記指令値出力部から負の前記指令電流が入力された場合に、前記降圧制御が実施されていると判定する請求項1〜3のいずれか一項に記載のDCDCコンバータの制御装置。
- 前記操作部は、取得された前記リアクトル電流が正極性である場合に、前記昇圧制御が実施されていると判定し、取得された前記リアクトル電流が負極性である場合に、前記降圧制御が実施されていると判定する請求項1〜3のいずれか一項に記載のDCDCコンバータの制御装置。
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