Detection module, device and system for detecting fan's connection and disconnection states

A detection device for detecting fan's connection and disconnection states, comprising:

• a fan having a positive power terminal, a negative power terminal, a rotation speed control terminal, and a rotation speed feedback terminal;
• and
• a detection module including:
• a power supply unit for receiving an external power supply;
• the power supply unit being connected to the positive power terminal and the negative power terminal of the fan, and providing the external power supply to the fan via the positive power terminal and the negative power terminal;
• and
• a processor unit being connected to the power supply unit and capable of generating a detection signal and a rotation speed control signal to the fan via the rotation speed control terminal;
• the rotation speed control signal driving the fan to operate and accordingly generate a fan rotation speed signal, which is transmitted to the processor unit via the rotation speed feedback terminal of the fan;
• and the detection signal transmitted to the fan being fed back to the processor unit via the rotation speed feedback terminal of the fan;
• whereby the processor unit determines whether the fan is connected to or disconnected from the detection module according to whether or not a fed back detection signal is received by the processor unit from the fan.

A detection system for detecting fan's connection and disconnection states, comprising:

• a fan having a positive power terminal, a negative power terminal, a rotation speed control terminal, and a rotation speed feedback terminal;
• a detection module including:
• a power supply unit for receiving an external power supply;
• the power supply unit being connected to the positive power terminal and the negative power terminal of the fan, and providing the external power supply to the fan via the positive power terminal and the negative power terminal;
• and
• a processor unit being connected to the power supply unit and capable of generating a detection signal and a rotation speed control signal to the fan via the rotation speed control terminal;
• the rotation speed control signal driving the fan to operate and accordingly generate a fan rotation speed signal, which is transmitted to the processor unit via the rotation speed feedback terminal of the fan;
• and the detection signal transmitted to the fan being fed back to the processor unit via the rotation speed feedback terminal of the fan;
• and
• a host being connected to the detection module via a communication connection unit, and determining whether the fan is connected to or disconnected from the detection module according to whether or not a fed back detection signal is received by the processor unit from the fan and transmitted to the host via the communication connection unit.