Patent ID: 9712102
Date: 2017-07-18
CPC Classifications: F04D,G06F,H02K,H02P

Claim:
1. A servo fan comprising a programming control device coupled to a motor, the programming control device comprising: an input/output interface, having a first connection line, a second connection line, a third connection line and a fourth connection line, wherein the first connection line is coupled to an operation voltage, the second connection line is coupled to a ground voltage, the third connection line is used for outputting a frequency generator signal or receiving a clock signal, and the fourth connection line is used for receiving a voltage of speed signal, or receiving and outputting a programming data signal; a micro processing unit, having a plurality of pins and having a non-volatile memory, wherein the non-volatile memory stores a firmware used for driving the motor; and a function circuit, coupled to the input/output interface and the micro processing unit, and determining whether the micro processing unit enters a programming mode to update the firmware according to a magnitude of the operation voltage, wherein the function circuit comprises: a voltage detector, coupled to the first connection line to receive the operation voltage, and outputting the control signal when the operation voltage is lower than a predetermined voltage, and outputting an enable signal to a first pin in the plurality of pins to make the micro processing unit to enter the programming mode.