Circuit for controlling current switching in multiple inductive loads, with single current detector, particularly for windings of step motors
US4928049A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1988 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Sep 16, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P8/12
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The circuit controls current switching in multiple inductive loads (L1, L2, L3, L4) fed by means of respective switching switches (SW1, SW2, SW3, SW4) and by means of respective current adjustment switches (SWA, SWB), and comprises a single sense resistor (R) in series to said switching switches, and a single comparator circuit (C, FF) adapted to generate a logical signal (Q) when the voltage across the sense resistor exceeds a reference voltage (V.sub.ref), which drives a plurality of AND gates (PA, PB) which control said adjustment switches and the second inputs whereof are driven by respective square-wave signals in opposite phase with a period equal to twice the switching period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.