An apparatus and method for controlling a voltage converter

H - Electricity – 02 – M

Patent

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Details

H02M 3/155 (2006.01) B60L 11/18 (2006.01) B60L 15/20 (2006.01) H02J 7/00 (2006.01) H02M 3/157 (2006.01) H02M 7/5387 (2006.01) B60K 6/04 (2006.01)

Patent

CA 2470934

By using a target voltage Vc* of a capacitor connected to the output side of a DC/DC converter and a voltage Vb of a battery connected to the input side of the DC/DC converter, a duty ratio D (Vb/Vc*) as a drive instruction of the DC/DC converter is calculated (S100, S102). By using the voltage Vb, the electromotive force Vbo of the battery, and the charge/discharge current Ib of the battery, an internal resistance Rb ((Vbo - Vb)/Ib) is calculated (S104). According to the internal resistance Rb and the electromotive force Vbo, the current value (value Vbo/2Rb) when the battery output becomes maximum is set as the upper limit value of the optimal current range IR (S106). the DC/DC converter is driven/controlled by limiting the duty ratio D so that the current Ib is within the range of the optimal current range IR (S108, S110, S112). Thus, it is possible to appropriately convert the battery input voltage.

L'utilisation d'une tension cible Vc* d'un condensateur relié au côté sortie d'un convertisseur continu-continu, et d'une tension Vb d'un accumulateur relié au côté entrée du convertisseur continu-continu, permet de calculer (S100, S102) un facteur de marche D (Vb/Vc*) en tant qu'instruction d'entraînement du convertisseur continu-continu. L'utilisation de la tension Vb, de la force électromotrice Vbo de l'accumulateur, et du courant de charge/décharge Ib de l'accumulateur, permet de calculer (S104) une résistance interne Rb ((Vbo Vb)/Ib). En fonction de la résistance interne Rb et de la force électromotrice Vbo, lorsque la sortie de l'accumulateur est maximum, la valeur du courant (valeur Vbo/2Rb) est fixée comme valeur limite supérieure de la plage IR (S106) de courant optimale. Le convertisseur continu-continu est entraîné/commandé par limitation du facteur de marche D de sorte que le courant Ib soit compris dans la plage IR de courant optimal (S108, S110, S112). Ce mode de réalisation permet de convertir la tension d'entrée de l'accumulateur.

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