Patent · US Expired

Transformerless power unit

US4591728A · kind A · utility

10Cited by

2References

3Claims

0Family size

Assignee

Diehl GmbH & Co. · DE

Inventors

Tilmann Kruger · Neunkirchen, DE
Werner Arnold · Plankstadt, DE
Leonhard Scheumann · Nuremberg, DE

Key dates

Filing date	Mar 8, 1984
Grant date	May 27, 1986
Priority date	—
Expiry date	Mar 8, 2004

Classification

Technology area (CPC H)Electricity
CPC primaryH02M7/05
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A transformerless power unit for an electronic apparatus, preferably a horological instrument, including a fluorescent display, with a compensating resistor network which is connected with one pole of the supply voltage, preferably of a series circuit constituted of an ohmic impedance and a capacitor, with a rectifier diode, with a stabilizer for the stabilization of the output direct voltage, and with a charging capacitor which is connected in parallel with the output.

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