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Electric power conversion system

專利號
US10097093B2
公開日期
2018-10-09
申請人
TOYOTA JIDOSHA KABUSHIKI KAISHA（JP Toyota-shi, Aichi-ken）
發(fā)明人
Shohei Sunahara; Hidetsugu Hamada; Akihiko Ide; Masatoshi Shinohara
IPC分類
H02J1/10; H02J3/38; H02M3/158
技術(shù)領(lǐng)域
pwm2,pwm,pwm1,cnv1,cnv2,shift,switching,phase,cnv,step
地域： Toyota-shi, Aichi-ken

摘要

An electric power conversion system includes: a first battery; a second battery; an electric power converter including a plurality of switching elements, and configured to bidirectionally step up or step down electric power between an output line and each the first and second batteries in accordance with PWM signals; and a controller configured to control first and second step-up and step-down circuits by generating first and second PWM signals. The first and second step-up and step-down circuits are established between each first and second batteries and the output line. The first and second PWM signals are signals for controlling step-up and step-down operation of each first and second step-up and step-down circuit. The controller is configured to, when coupling on-duty periods of both the first and second PWM signals with each other, execute an overlap phase shift that partially overlaps the on-duty periods of the first and second PWM signals.

說明書

? 2 ′ 2 ) × 360 ? ° = θ sft ( 2 )

The CNV controller 13 applies the phase shift based on the shift amount θsft to the next period PWM2t subsequent to the current period. As a result, as shown in FIG. 10, between the periods PWM21 to PWM23, the rising edge of the PWM signal PWM2 is advanced with respect to the falling edge of the PWM signal PWM1, and the advance amount (overlap width) reduces once every period. In addition, in a period PWM24, the falling edge of the PWM signal PWM1 coincides with the rising edge of the PWM signal PWM2.

In this way, by executing the overlap phase shift, even when the on period of the PWM signal is gradually shortened over multiple periods, separation of the rising edge of the PWM signal PWM2 from the falling edge of the PWM signal PWM1 is avoided. Therefore, the number of times of execution of the phase shift reduces, so it is possible to prevent an increase in switching loss of an auxiliary pulse accordingly.

權(quán)利要求

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