Radio transmission modules having intrinsic safety

摘要

Described herein are arrangements and methods for achieving intrinsic safety for a radio transmission module. One aspect provides an apparatus for transmitting signals in an explosion-hazardous area with intrinsic safety, including: a radio transmission module having a high frequency module and an electronic control circuit disposed on a printed circuit board, said electronic control circuit being configured to control a voltage supply to the high frequency module in response to one or more of: output voltage of the high frequency module exceeding a predetermined voltage value, as independently measured by at least two independently operating hardware circuits; and a temperature of a heat-conducting potting compound potted over heat generating components disposed on the printed circuit board exceeding a predetermined temperature value, as independently sensed by at least two independently operating temperature circuits. Other embodiments are described.

主权项

1. An arrangement for achieving intrinsic safety of a radio transmission module with an HF power stage (RF-P) and an electronic control unit (Se) on a board for transmitting signals and measured values in an explosion-hazardous area, which includes an external voltage supply, an antenna connector (Aa) and an input connector, characterized in that
at the base of an antenna (A) at least two independently operating hardware circuits (P1, P2, P3) are arranged for rectification of output voltage of the HF power stage (RF-P) and for comparison with a maximum admissible value, each comprising one rectifier circuit (GL1, GL2, GL3) and one comparator (K1, K2, K3) whose outputs are connected via a control circuit (Se) with a limiter circuit (Bgr) for switching off voltage supply or for limiting output power of the radio transmission module to a maximum admissible value.