Patent ID: 8086280
Filing Date: 2011-12-27
Classification: H04B

Abstract:
1. An explosion-proof communication relay module, comprising: a non-metallic housing; a processor; a first antenna and a second antenna both positioned completely within the housing; a radio receiver and relay circuit coupled to the processor, the first antenna and the second antenna, the radio receiver and relay circuit configured to receive radio frequency signals from the first antenna at a first frequency and retransmit the received signals from the second antenna at a second frequency different from the first frequency; a battery coupled to the processor and to the radio receiver and relay circuit, wherein the battery is rechargeable; an induction coil coupled to a rectifier coupled to the battery, wherein the induction coil and rectifier are configured to generate a voltage which can be used to charge the battery when an alternating magnetic field is applied to the induction coil; a fault tolerant circuit element coupled to the battery; and a transistor coupled between the rectifier and the battery with a control lead coupled to the processor, wherein the processor, first antenna, second antenna, radio receiver, relay circuit, battery and fault tolerant circuit element are all positioned completely within the non-metallic housing, and wherein the processor is configured with processor-executable software instructions to regulate charging of the battery when the voltage is generated by the induction coil and rectifier.