Title:
DRIVING SYSTEM OF POWER CONVERSION DEVICE OF ELEVATOR
Document Type and Number:
WIPO Patent Application WO/2020/188784
Kind Code:
A1
Abstract:
A gate driving circuit of a voltage-driven semiconductor according to the related art comprises an optimal gate resistor adjusted according to an input capacitance of a gate terminal of the voltage-driven semiconductor. However, since the input capacitance of the gate terminal varies depending on the product type, there is a problem in that a substrate on which the gate driving circuit of the voltage-driven semiconductor is mounted needs to be prepared for each voltage-driven semiconductor. When a voltage is applied to a gate terminal of the voltage-driven semiconductor, the voltage rise time of the voltage of the gate terminal changes in proportion to the capacitance of the gate terminal. In a method of estimating the capacitance of the gate terminal on the basis of a difference in the voltage rise time, a counting circuit using a pulse having a constant cycle is used. The total number of pulse counts is measured from a time when the voltage is applied to the gate terminal to a time when the voltage reaches a threshold voltage or higher. Thereafter, a gate current of the gate driving circuit is adjusted using a gate resistance adjustment voltage that is proportional to the total number of pulse counts.
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Inventors:
TAKIZUKA TAKAHIRO (JP)
Application Number:
PCT/JP2019/011673
Publication Date:
September 24, 2020
Filing Date:
March 20, 2019
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
International Classes:
H02M1/08; H03K17/28
Foreign References:
| JP2006222593A | 2006-08-24 | |||
| JP2011239383A | 2011-11-24 | |||
| JP2008048569A | 2008-02-28 |
Attorney, Agent or Firm:
MURAKAMI, Kanako et al. (JP)
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