Automotive high intensity discharge ballast
US7642727B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2006 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Dec 29, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A new ballast circuit for automotive high intensity discharge (HID) applications is disclosed. The ballast utilizes two DC/DC converters and two low frequency inverter switches. The ballast also includes an integrated high voltage ignition circuit. The positive DC/DC converter builds up a high ignition voltage in addition to raising the DC position bus. When the lamp breaks down, the DC bus voltage decreases and the ignition circuit falls inactive. The DC/DC stages are then alternately conductive to supply power to the lamp via the low frequency inverter switches. The disclosed ballast reduces the number of the switches used to four from a typical six, it utilizes independently controlled voltage source, and provides a more efficient run-up voltages waveform during pre-steady state running of the lamp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.