Software-controlled electronic circuit for switching power to a three-phase motor
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United States of America Patent
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Jul 17, 2018
Grant Date -
Jul 13, 2017
app pub date -
Feb 3, 2017
filing date -
Jan 8, 2016
priority date (Note) -
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Abstract
The circuit for controlling a rotating three-phase motor of the type having three interconnected motor coils each corresponding to one of three phases employs a plurality of switching circuit components, each connected to the motor to supply current to one of the coils. A signal generator circuit produces in synchronism with the rotation of the motor a variable duty cycle pulse-width modulated signal for each of the switching circuit components. A logic gating circuit is coupled to the signal generator circuit and to the switching components. The logic gating circuit is operative to cause the switching circuit components to selectively place pairs of motor coils in current conducting states such that when the variable duty cycle pulse-width modulated signals are each concurrently in the same logical on-off state, the logic gating circuit supplies a logical off state to each of the switching circuit components.
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