A motor controller comprises a switch circuit, a control unit, and a duty cycle processing unit. The switch circuit is coupled to a motor for driving the motor. The control unit is configured to generate a plurality of control signals to control the switch circuit. The duty cycle processing unit receives a first pulse width modulation signal, where the first pulse width modulation has a first duty cycle. The duty cycle processing unit is configured to judge if the first duty cycle is equal to 0% or 100%. The duty cycle processing unit comprises a duty cycle computing unit, where the duty cycle computing unit is configured to capture the first duty cycle.

A motor controller comprises a switch circuit, a control unit, and a duty cycle processing unit. The switch circuit is coupled to a motor for driving the motor. The control unit is configured to generate a plurality of control signals to control the switch circuit. The duty cycle processing unit receives a first pulse width modulation signal, where the first pulse width modulation has a first duty cycle. The duty cycle processing unit is configured to judge if the first duty cycle is equal to 0% or 100%. The duty cycle processing unit comprises a duty cycle computing unit, where the duty cycle computing unit is configured to capture the first duty cycle.

An apparatus for regulating a slew time of an output voltage of a motor driver system includes a gate current control circuit which has a first input coupled to receive a target slew time and a second input coupled to receive a slew time. The gate current control circuit provides an incremented gate current if the slew time is greater than the target slew time and provides a decremented gate current if the slew time is less than the target slew time. The apparatus includes a gate driver which has a first input coupled to receive a PWM signal and a second input coupled to receive the gate current. The gate driver provides a gate drive signal.

An apparatus for regulating a slew time of an output voltage of a motor driver system includes a gate current control circuit which has a first input coupled to receive a target slew time and a second input coupled to receive a slew time. The gate current control circuit provides an incremented gate current if the slew time is greater than the target slew time and provides a decremented gate current if the slew time is less than the target slew time. The apparatus includes a gate driver which has a first input coupled to receive a PWM signal and a second input coupled to receive the gate current. The gate driver provides a gate drive signal.

A control circuit regulates the propagation delay of a field effect transistor (FET) before the FET transitions to the Miller region by applying a pre-charge current for a fixed duration to the gates of the FET. After the fixed duration, the current is reduced to a lower drive current level which is based on a desired output voltage slew rate. After the FET transitions to the Miller region, the output voltage slews down in accordance with the output voltage slew rate. By regulating the slew-rate of the output voltage in the Miller region and regulating the propagation delay of the FET prior to the Miller region, the control circuit reduces electromagnetic interference (EMI) caused by the switching of the FET, thereby improving electromagnetic compatibility (EMC) of switch mode driver systems without increasing the propagation delay of the FET.

An exercise machine comprises a user force input element, a transmission unit, an electric motor, and an electrical circuit connected to the electric motor. The user force input element is connected to the electric motor via the transmission unit such that said electric motor turns at an angular velocity which is different than the velocity or angular velocity of the user force input element. The motor runs as a generator such that when the electric motor is turned, an electrical current is developed in the electrical circuit. The electrical circuit comprises an electrical resistor, a switching element, a Pulse Width Modulation (PWM) controller, and a load reference controller.

An exercise machine comprises a user force input element, a transmission unit, an electric motor, and an electrical circuit connected to the electric motor. The user force input element is connected to the electric motor via the transmission unit such that said electric motor turns at an angular velocity which is different than the velocity or angular velocity of the user force input element. The motor runs as a generator such that when the electric motor is turned, an electrical current is developed in the electrical circuit. The electrical circuit comprises an electrical resistor, a switching element, a Pulse Width Modulation (PWM) controller, and a load reference controller.

A control circuit applied to a lifting platform controls a motor to adjust the height of a platform. The control circuit includes an AC/DC conversion circuit, a DC/DC conversion circuit, a detection unit, and a control unit. The detection unit detects an output end of the AC/DC conversion circuit and provides a detection signal. The control unit provides a PWM signal according to the detection signal to control the DC/DC conversion circuit so that the DC/DC conversion circuit converts a DC voltage to an output voltage. When the control unit realizes that the DC voltage or a DC power provided by the AC/DC conversion circuit is less than a power supply threshold according to the detection signal, the control unit decreases a duty cycle of the PWM signal to maintain the DC voltage or the DC power to be greater than or equal to the power supply threshold.

A control circuit applied to a lifting platform controls a motor to adjust the height of a platform. The control circuit includes an AC/DC conversion circuit, a DC/DC conversion circuit, a detection unit, and a control unit. The detection unit detects an output end of the AC/DC conversion circuit and provides a detection signal. The control unit provides a PWM signal according to the detection signal to control the DC/DC conversion circuit so that the DC/DC conversion circuit converts a DC voltage to an output voltage. When the control unit realizes that the DC voltage or a DC power provided by the AC/DC conversion circuit is less than a power supply threshold according to the detection signal, the control unit decreases a duty cycle of the PWM signal to maintain the DC voltage or the DC power to be greater than or equal to the power supply threshold.

A battery pack and charger platform including a voltage coupling circuit comprising an input that receives an input voltage and an output that sends an output voltage, a voltage monitoring circuit having an input coupled to the voltage coupling circuit output and an output, and a power source having an input coupled to the voltage monitoring circuit output, the power source input receives an input voltage representative of a charge instruction.