ST Life.augmented

Universal Motor High frequency PWM Drive

The pulse width modulation (PWM) technique (also known as chopper drive) is used to adjust the voltage applied to the motor. With the variation of the PWM duty cycle, the effective voltage seen by the motor can be changed. Compared to a phase-angle drive, a chopper drive requires a more complicated power stage with an input rectifier (if AC mains is the source), a power switch and a fast power diode for motor current recirculation at switch-off. The advantage of PWM modulation with respect to phase-angle partialization is higher efficiency, less acoustic noise and better EMC behavior, but it can have an impact on brush life duration.

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Technical Documentation

Application Notes

Description Version Size
AN1894: VIPower: VIPer12A non insulated buck and buck-boost converter reference board
1.2 305 KB
AN2300: An alternative solution to capacitive power supply using buck converter based on VIPer12A
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AN414: Controlling a brushed DC motor with an ST6265C or ST6260C MCU
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AN422: Improved Universal Motor Drive
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