Patent · US Expired

Half bridge circuit drive without collector bias current peak

US6172890A · kind A · utility

1Cited by

4References

10Claims

0Family size

Assignee

Patent-Treuhand-Gesellschaft fur elektrische Gluhlampen mbH · DE

Inventor

Felix Franck · Hersbruck, DE

Key dates

Filing date	Dec 27, 1999
Grant date	Jan 9, 2001
Priority date	—
Expiry date	Dec 27, 2019

Classification

Technology area (CPC H)Electricity
CPC primaryH05B41/2825
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

By adding a base bridging capacitor (C6, C6') between the base connections of a bipolar transistor bridge oscillator, in particular of an electronic ballast for a low-pressure gas discharge lamp, the collector initial current peak is avoided, while ensuring that the switching transistors (T1, T2) are switched on, without any voltage, at the right time.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.