Patent ID: 8030869

Claim:
A drive amplifier system for driving at least one motor, comprising: a drive control device configured for providing at least one drive command; at least one drive amplifier connected to the drive control device configured for receiving the at least one drive command, and configured to drive the at least one motor, each of the at least one drive amplifiers comprising: a control circuit configured for receiving the at least one drive command to drive a corresponding motor of the at least one motor; and a state memory comprising: an over-current setting module configured for storing an over-current value of each of the at least one drive amplifiers; and a work state module configured for storing a work state of each of the at least one drive amplifiers; and a power supply configured for providing power for the at least one drive amplifier to drive the at least one motor correspondingly, comprising: a current sensor configured for sensing a actual current value provided by the power supply for the at least one drive amplifier, and a power control circuit comprising: a state comparator comprising a work state discriminator configured for determining a work state of each of the at least one drive amplifiers and outputting an over-current value of the at least one drive amplifier that is working, and an over-current value discriminator for receiving the over-current value from the work state discriminator and adding up the over-current values of each of the at least one drive amplifiers that are working to get a total over-current value, and outputting the total over-current value functioning as a reference current value; a controller configured for receiving the reference current value and outputting the reference current value; and an over-current detection circuit configured for receiving the reference current value from the controller and the actual current value from the current sensor to compare the reference current value with the actual current value; wherein the over-current detection circuit outputs an over-current detection signal in response to the actual current value being more than the reference current value.