Abstract: A linear power controller system may be implemented that includes locked-rotor protection circuitry that is primarily assembled using analog circuit components. The locked rotor protection circuitry may be part of a power module in the system. The power module may be a switched power source that includes temperature circuit. A control loop may be established in the system to maintain the voltage across a motor that is driver by the power module. Circuitry for establishing a close loop with a motor may be positioned in a control head in the system or in a power module in the system. Temperature protection circuitry may be integrated into a current source in the power module to provide automatic thermal shutdown of the current source. The linear power module may specifically include analog circuitry that is arranged to establish a control loop with the motor.

Abstract: The invention relates to a method and system for linear speed control for electric direct current motors, in which digital to analog converter circuitry is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state machine means is used for converting the duty cycle of an input signal for output to the digital to analog converter means, and a closed loop feedback means is used for monitoring and setting the voltage across the motor. An over-current sense circuit can be used for monitoring the current across or passing through the electric motor. An over/under voltage sense circuit can be used for monitoring voltage of the electric motor. The resulting 8-bit digital control signal is converted to an analog voltage for the electric motor.