Title:
ELECTRICAL APPARATUS
Document Type and Number:
Japanese Patent JP2021171868
Kind Code:
A
Abstract:
To provide an electrical apparatus that can reduce the risk that a control circuit performs control without recognizing whether there is missing of an electronic component or not.SOLUTION: In an electrical apparatus 1, resistances Ra, Rc generate a prescribed protective threshold voltage by dividing 5 V into partial voltages in a prescribed ratio. A CPU 100 determines missing of the resistance Rc when detecting that a voltage of a d-terminal is 5 V at the time of startup. In this case, the CPU 100 arbitrarily resets the protective threshold voltage to be input to a nonreversal input terminal of a comparator 120 by setting the d-terminal in an open drain terminal and intermittently drawing an electric current. The CPU 100 determines missing of the resistance Ra when detecting that the voltage of the d-terminal is 0 V at the time of startup. In this case, the CPU 100 arbitrarily resets the protective threshold voltage to be input to the nonreversal input terminal of the comparator 120 by setting the d-terminal in an output terminal an outputting a PWM signal from the d-terminal.SELECTED DRAWING: Figure 1
Inventors:
HOSHINO KENICHI
KONO SACHIKAZU
NIITO TOSHIYA
KONO SACHIKAZU
NIITO TOSHIYA
Application Number:
JP2020076987A
Publication Date:
November 01, 2021
Filing Date:
April 23, 2020
Export Citation:
Assignee:
KOKI HOLDINGS CO LTD
International Classes:
H02M7/48; B25F5/00
Attorney, Agent or Firm:
Takashi Murai
Hiromi Murai
Hiromi Murai