Control system and drive circuit board for aiding mechanical arm to escape

A control system of a mechanical arm, comprising:

• a first transform circuit outputting a first digital power signal in a first mode of the mechanical arm;
• a second transform circuit outputting a second digital power signal in the first mode of the mechanical arm, wherein when the control system is unable to control the mechanical arm to keep in the first mode, the second digital power signal is cut off;
• a third transform circuit outputting a third digital power signal when the control system is unable to control the mechanical arm to keep in the first mode;
• a decoder receiving a sensing signal, decoding the sensing signal, and outputting a decoded signal;
• a calculator coupled to the decoder for receiving the decoded signal and generating a speed signal according to the decoded signal;
• a computing circuit coupled to the third transform circuit for receiving the third digital power signal and comparing the third digital power signal with a power threshold signal to generate a power computing signal and coupled to the calculator for receiving the speed signal and comparing the speed signal with a speed threshold signal to generate a speed computing signal;
• and
• a control circuit coupled to the computing circuit for controlling the mechanical arm to change from the first mode to a second mode according to the speed computing signal and cutting off the second digital power signal, and for controlling the mechanical arm to change from the second mode to a third mode according to the power computing signal.