1 Introduction
In recent years, China's coal mine mechanization and automation have been increasing, and mine monitoring, communication, instrumentation automation systems and other applications are becoming more and more common, but the special environment of coal mines requires that coal mine electrical equipment must use intrinsically safe equipment. The intrinsically safe power supply is an indispensable part of the mine intrinsically safe system. Its technological advancement and product quality determine the reliability of the intrinsically safe equipment, which directly affects the accuracy and stability of the monitoring system data collection, and is related to mine safety. Production, resilience and miners' safety.
2. System overall plan
According to the standard of DC stabilized power supply for coal mine, the input voltage of the power supply is 75%~110% of the nominal value of AC 127V (ie 95V~140V), and the ripple voltage of the output voltage should not exceed 5% of the DC output voltage of 12V. According to the requirements, this paper uses TOP244Y switching power supply chip, on the basis of high-frequency switching power supply, plus over-voltage protection circuit and over-current protection circuit, designed a new 12V intrinsically safe power supply (highest open circuit voltage 12.4V maximum short-circuit current 150mA) .
As shown in Figure 1, the system includes the following three parts:
Switching power supply circuit, overvoltage protection circuit, overcurrent protection circuit.
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