GPRS module for automatic heating of SIM card in low-temperature environment and temperature control method

Abstract

The invention discloses a GPRS module for automatic heating of an SIM card in a low-temperature environment and a temperature control method. The GPRS module includes a main control module, a GPRS communication module, an SIM card temperature detection circuit and an SIM card heating circuit. The GPRS communication module is provided with a UART interface which is in communication with the main control module and is also provided with a reference voltage output pin, an ADC sampling input pin and a heating control signal output pin. The SIM card temperature detection circuit is connected with the reference voltage output pin and the ADC sampling input pin of the GPRS communication module. The SIM card heating circuit is connected with the heating control signal output pin of the GPRS communication. A detection end of the SIM card temperature detection circuit and a heating end of the SIM card heating circuit are arranged around an SIM card. In the GPSR module for automatic heating of the SIM card in the low-temperature environment, the GPRS communication module is provided with the ADC pin and the control pin and AT commands are expanded at the same time and peripheral temperature detection and heating circuits are used in combination to realize low-temperature detection and heating of the SIM card and a problem that the SIM card is susceptible to work abnormity in a low temperature is solved.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a GPRS module capable of automatically heating a SIM card in a low-temperature environment and a temperature control method thereof. Background technique [0002] With the rapid development of my country's smart grid, more than 60 million smart meters are applied to the field every year, and the climax of smart meter installation has brought a huge demand for mobile data communication terminals, most of which use GPRS communication modules For remote data communication, millions of GPRS communication terminals are used in the field of smart meters every year. [0003] What GPRS communication module uses at present is common SIM card, and its operating temperature range is -25 ℃~+85 ℃. In northern China, the temperature is cold in winter, especially in Heilongjiang and other regions, where the lowest temperature in winter can reach -40°C. The low temperature environmen...

AI Technical Summary

Problems solved by technology

In northern China, the temperature is cold in winter, especially in Heilongjiang and other regions, where the lowest temperature in winter can reach -40°C. The low temperature environment seriously affects the normal operation of electronic equipment, especially the SIM card, and it is easy to cause poor contact between the SIM card and the equipment. The communication failure caused greatly affected the business operation of the power company.

Images