| 摘要 |
The circuit provides the electrical supply to a direct current motor (1) using a first battery (2) and a series current chopper. This includes a first static switch (10) whose conduction is controlled by a first periodic signal (21). There is a second battery (3) with a second static switch (11) which is placed in one of the branches (18,19) connecting the motor to the second battery. The conduction of the second switch is controlled by a second periodic signal (22). A generator (23) produces the two periodic signals according to a synchronous but shifted pattern, with the frequency of the two signals being variable. The switching components may be transistors or thyristors, whilst the switching control system may incorporate an opto-electronic coupler (37,54) The generator comprises a monostable multivibrator emitting a rectangular signal which is the source of the two shifted signals. |
