US 12,093,066 B2
Electronic control device
Masahiro Doi, Hitachinaka (JP); Yuri Ohara, Hitachinaka (JP); and Takeo Yamashita, Hitachinaka (JP)
Assigned to Hitachi Astemo, Ltd., Hitachinaka (JP)
Appl. No. 17/286,698
Filed by Hitachi Astemo, Ltd., Hitachinaka (JP)
PCT Filed Sep. 19, 2019, PCT No. PCT/JP2019/036682
§ 371(c)(1), (2) Date Apr. 19, 2021,
PCT Pub. No. WO2020/084966, PCT Pub. Date Apr. 30, 2020.
Claims priority of application No. 2018-199210 (JP), filed on Oct. 23, 2018.
Prior Publication US 2021/0341957 A1, Nov. 4, 2021
Int. Cl. G05F 1/565 (2006.01); G05F 1/46 (2006.01); G05F 1/577 (2006.01); H03K 17/22 (2006.01)
CPC G05F 1/565 (2013.01) [G05F 1/465 (2013.01); G05F 1/577 (2013.01); H03K 17/223 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electronic control device comprising:
a first power supply circuit that outputs a first voltage;
a second power supply circuit that generates a second voltage from the first voltage; and
a terminal connected to either a gate terminal of a first MOSFET that outputs the second voltage, the output of the first power supply circuit, or the ground;
wherein the second power supply circuit includes:
a reference power supply that outputs a reference voltage;
an amplifier that amplifies the reference voltage;
a second MOSFET that receives the output of the amplifier and outputs the second voltage;
a voltage detection unit that detects a voltage value of the terminal; and
a switching unit that connects an output from the amplifier to either one of the terminal or a gate terminal of the second MOSFET, and
the switching unit is controlled based on a voltage value at a start detected by the voltage detection unit, wherein
the voltage detection unit has a detection filtering time and completes the detection when the voltage of the terminal maintains a constant voltage for a certain time, and
the detection result of the voltage detection unit is latched by the voltage detection unit.