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Title:
POWER CONVERSION DEVICE AND TEMPERATURE INCREASE CALCULATION METHOD THEREOF
Document Type and Number:
WIPO Patent Application WO/2011/162318
Kind Code:
A1
Abstract:
A temperature increase of a semiconductor switching element, which forms part of a power conversion device such as an inverter, is estimated by an extremely simple method to assess the degradation and remaining lifetime of the semiconductor switching element. In a heat generation amount calculation unit (12) in a calculation processor (3), current command values (Id*, Iq*) and voltage command values (vu*, vv*, vw*) are used to calculate chip loss. First, current values (iu*, iv*, iw*) of each output phase are estimated from the current command values. The ON/OFF loss of a chip is represented by a function of an estimate value for current flowing in each output phase, and the loss can be derived by integration with the PWM carrier frequency (f). In addition, with respect to conduction loss, it is necessary to integrate conduction time with the current estimate value and saturated voltage which is a function of the current estimate value, but the conduction time is calculated from the relationship between the carrier amplitude and the voltage command value for each control period (fsw) of the switching element. In addition, the absolute temperature is calculated by the addition of an atmospheric temperature sensor.

Inventors:
AYANO Hideki (HITACHI LTD., 1-1, Omika-cho 7-chome, Hitachi-sh, Ibaraki 92, 〒3191292, JP)
綾野 秀樹 (〒92 茨城県日立市大みか町七丁目1番1号 株式会社日立製作所 日立研究所内 Ibaraki, 〒3191292, JP)
ISHIKAWA Katsumi (HITACHI LTD., 1-1, Omika-cho 7-chome, Hitachi-sh, Ibaraki 92, 〒3191292, JP)
石川 勝美 (〒92 茨城県日立市大みか町七丁目1番1号 株式会社日立製作所 日立研究所内 Ibaraki, 〒3191292, JP)
OGAWA Kazutoshi (HITACHI LTD., 1-1, Omika-cho 7-chome, Hitachi-sh, Ibaraki 92, 〒3191292, JP)
Application Number:
JP2011/064347
Publication Date:
December 29, 2011
Filing Date:
June 23, 2011
Export Citation:
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Assignee:
HITACHI, LTD. (6-6 Marunouchi 1-chome, Chiyoda-ku Tokyo, 80, 〒1008280, JP)
株式会社日立製作所 (〒80 東京都千代田区丸の内一丁目6番6号 Tokyo, 〒1008280, JP)
AYANO Hideki (HITACHI LTD., 1-1, Omika-cho 7-chome, Hitachi-sh, Ibaraki 92, 〒3191292, JP)
綾野 秀樹 (〒92 茨城県日立市大みか町七丁目1番1号 株式会社日立製作所 日立研究所内 Ibaraki, 〒3191292, JP)
ISHIKAWA Katsumi (HITACHI LTD., 1-1, Omika-cho 7-chome, Hitachi-sh, Ibaraki 92, 〒3191292, JP)
石川 勝美 (〒92 茨城県日立市大みか町七丁目1番1号 株式会社日立製作所 日立研究所内 Ibaraki, 〒3191292, JP)
International Classes:
H02M7/48; H02P27/06
Attorney, Agent or Firm:
POLAIRE I.P.C. (7-1 Hatchobori 2-chome, Chuo-ku Tokyo, 32, 〒1040032, JP)
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Claims: