1. To solve the problem of gas concentration exceeding the limit in the main roadway caused by the constant speed operation of local ventilation fans in coal mines, our company has developed an explosion-proof and inherently safe dual power dual frequency converter. The device is designed as two independent explosion-proof boxes, which have two relatively independent frequency control systems and integrate the two sets of frequency control systems with the dual machine switching control system. The dual power dual frequency converter can control two ventilation fans simultaneously, and the two ventilation fans can be used as backups or divided into one main and one auxiliary. Both of these frequency conversion control systems can automatically adjust the speed of the ventilation fan according to changes in gas concentration, supply air as needed, and can switch automatically as long as the gas concentration does not exceed the limit. The switching methods are flexible and diverse, which can maintain continuous air supply to the working face. Ensure the safe discharge of gas and achieve "dual machine hot standby".

　　2. Adopting IGBT power module with movement, low power loss, and configuration.

　　3. Using vacuum heat pipes for natural heat dissipation and heat exchange, the radiator has a large heat dissipation capacity and is lightweight.

　　4. The device operation panel has good human-machine dialogue function, displaying various operating parameters, etc.

　　5. The device has functions such as overvoltage, undervoltage, overload, short circuit, phase loss, overheating, leakage lockout, and leakage protection, as well as fault memory and query functions.

　　6. The remote control circuit of the device is an inherently safe circuit with an open circuit voltage of DC15.5V and a short-circuit current of 10mA.