Three-phase current sensor and estimator
US6301137A · kind A · utility
Inventor
Key dates
| Filing date | Nov 3, 2000 |
| Grant date | Oct 9, 2001 |
| Priority date | — |
| Expiry date | Nov 3, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a three-phase DC-to-AC inverter including, for driving each leg of the load, a controlled power driver such a pulse-width modulated field-effect transistor (FET) or insulated gate bipolar transistor (IGBT) pair, an estimator for estimating the current in each leg of the load. A low-resistance leg resistor is connected in series in the lower leg of each transistor pair. The voltages across the leg resistors are applied to two differential amplifiers to generate two discrete voltage difference values that are transmitted to an estimator. The estimator solves specified differential equations using suitably interconnected combiners, integrators, amplifiers and multipliers, or discrete digital equivalent or programmed computer equivalent, to derive a value for the estimated current in each leg of the load.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.