United States Patent ( 19 ) 11 Patent Number : 4 , 523 , 134

@inproceedings{Ip2017UnitedSP,
  title={United States Patent ( 19 ) 11 Patent Number : 4 , 523 , 134},
  author={Shik Luen Ip},
  year={2017}
}
(21) Appl. No.: 608,249 In a DC motor control system, switching element driv 22 Filed: May 8, 1984 ng circuits are connected to respective base circuits of four switching elements arranged to form a bridge cir (51) Int, Cl. ............................................... H02P 5/00 cuit which has a DC motor connected thereto as an 52) U.S. Cl. .................................... 318/313; 318/317; electric load thereon, and an output signal interlocking w 318/327; 318/341; 318/599 circuit is… CONTINUE READING