Circuit for sensing individual leg current in a motor controller using resistive shunts
US5825641A · kind A · utility
46Cited by
4References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 26, 1998 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Jan 26, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor controller inverter circuit with resistive shunts for sensing the current flowing through individual legs of the motor controller. The circuit of the invention allows the use of a single monolithic three-phase driver by providing, in addition to a shunt resistor between the emitter pin of each low side IGBT and ground, an emitter return resistor between the emitter pin of each low side IGBT and the common V.sub.SO pin of the three-phase driver. The respective voltages developed across the shunt resistors can be sensed to determine the current flowing through the individual legs of the motor controller circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.