Variable voltage converter modulation obtaining lower minimum boost ratio
US10576828B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 2017 |
| Grant date | Mar 3, 2020 |
| Priority date | — |
| Expiry date | Sep 4, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T90/14
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A variable voltage converter for an electric drive system has upper and lower switching devices in series between positive and negative buses. An inductance couples a junction between the switching devices to a DC battery. A controller is configured to drive the switches according to PWM gate signals based on an expected boost ratio of the converter. The PWM gate signals have a nominal dead-time insertion for both the upper and lower switching devices when the expected boost ratio is greater than a predetermined boost ratio. In order to extend a range of achievable boost ratios during regeneration operation, the PWM gate signals are without dead-time insertion for the upper switching device and the lower switching device remains continuously off when the expected boost ratio is less than the predetermined boost ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.