Current control circuit
US4107593A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1977 |
| Grant date | Aug 15, 1978 |
| Priority date | — |
| Expiry date | Apr 7, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electronic circuit is provided for controlling the energization of the windings of a stepper motor. The electronic circuit is responsive to a sequencing circuit which selects which one of the stepper windings is to be energized. The electronic circuit includes switching transistors which are electrically connected to the stepper windings. The switching transistors are responsive to a control circuit to allow a selected one of the stepper windings to be energized by a voltage source. The switching transistors interrupt the energization of the selected stepper winding when the control circuit senses a predetermined amount of current flowing through the selected stepper winding. The control circuit causes the switching transistors to maintain this interruption for a predetermined time period after which the control circuit allows the energization to continue. The control circuit includes a resettable delay monostable multivibrator which is reset upon receiving a sequencing signal from the sequencing circuit. After being reset, the multivibrator provides a signal which immediately allows a second stepper winding to be energized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.