US 12,218,496 B2
Encoder having overvoltage breakdown prevention circuit
Shouhei Nishino, Yamanashi (JP); and Youhei Kondou, Yamanashi (JP)
Assigned to FANUC CORPORATION, Yamanashi (JP)
Appl. No. 18/040,801
Filed by FANUC CORPORATION, Yamanashi (JP)
PCT Filed Sep. 7, 2021, PCT No. PCT/JP2021/032895
§ 371(c)(1), (2) Date Feb. 6, 2023,
PCT Pub. No. WO2022/054809, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 2020-153663 (JP), filed on Sep. 14, 2020.
Prior Publication US 2023/0307904 A1, Sep. 28, 2023
Int. Cl. H02H 7/20 (2006.01); G01D 5/244 (2006.01); H02H 1/00 (2006.01)
CPC H02H 7/20 (2013.01) [G01D 5/24466 (2013.01); H02H 1/0007 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An encoder comprising:
at least one internal power supply configured to generate an encoder main circuit driving voltage and output the encoder main circuit driving voltage;
an encoder main circuit configured to be driven by using the encoder main circuit driving voltage supplied from the internal power supply, and to generate rotation information of a rotary body;
an overvoltage breakdown prevention circuit configured to generate an abnormality detection unit driving voltage, based on a voltage supplied from a main power supply, and output the abnormality detection unit driving voltage;
an abnormality detection unit configured to be driven by using the abnormality detection unit driving voltage that is output from the overvoltage breakdown prevention circuit, and to detect an abnormality relating to the internal power supply; and
a shutoff circuit configured to shut off supply of the encoder main circuit driving voltage to the encoder main circuit by the internal power supply, at a time of abnormality detection by the abnormality detection unit.