Patent · US Active

Protection circuit for intrinsically safe electro-magnetic actuators and a protection circuit for intrinsically safe energy supply systems

US7643262B2 · kind B2 · utility

2Cited by

7References

26Claims

0Family size

Assignee

DBT GMBH · DE

Inventors

Jens Titschert · Grafenau, DE
Markus Lenzing · Lüdinghausen, DE
Jeff Travis · Dexter, US
Dan Ferguson · Orem, US

Key dates

Filing date	Jan 18, 2006
Grant date	Jan 5, 2010
Priority date	—
Expiry date	Aug 3, 2026

Classification

Technology area (CPC H)Electricity
CPC primaryH02H9/008
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A protection circuit for intrinsically safe electromagnetic actuators operating on the voltage from a power unit (1) approved for underground mining, for switching electrohydraulic valves (5) in underground mining, comprising at least two spaced-apart short-circuit means (14, 16 or 16A) connected in parallel with the electromagnetic actuator coil (11) for short-circuiting the coil in the event of a reversal of the coil voltage. According to the invention, at least one of the short-circuit means comprises a short-circuit semi-conductor switch (16 or 16A) and a voltage-reversal detecting circuit (30) for activating the short-circuit semiconductor switch (16).

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