Time delay logic of motor control
First Claim
1. An electronic circuit for controlling a brushless motor (BLM), the electronic circuit comprising:
- an input for receiving a digital position signal from a Hall effect sensor, the Hall effect sensor for detecting the angular position of a BLM rotor;
a second input for receiving a digital pulse width modulated speed control signal; and
first circuitry for generating first and second drive signals based on the digital position signal, the first and second drive signals each comprising alternating driving intervals and non-driving intervals, the first and second drive signals for driving a BLM electromagnet with current of a first polarity during driving intervals of the first drive signal, and for driving the BLM electromagnet with current of a second, opposite polarity during driving intervals of the second drive signal,wherein the driving intervals of the first drive signal are temporally spaced from the driving intervals of the second drive signal such that endings of the driving intervals of the first drive signal do not coincide with the beginning of the driving intervals of the second drive signal.
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Accused Products
Abstract
Circuitry for controlling a motor, such as a brushless motor (BLM), is disclosed. The circuitry may comprise one or more inputs for receiving rotor position signals from one or more Hall effect sensors that detect the position of, for example, a BLM rotor. The circuitry may also comprise an input for receiving a pulse width modulated speed control signal. The circuitry generates one or more drive signals, each drive signal having a plurality of driving intervals. Each drive signal may control power switches during its driving intervals, the power switches being coupled to electromagnets of the BLM. The circuitry may cause the driving intervals of a first drive signal to be temporally spaced from the driving intervals of a second drive signal.
79 Citations
20 Claims
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1. An electronic circuit for controlling a brushless motor (BLM), the electronic circuit comprising:
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an input for receiving a digital position signal from a Hall effect sensor, the Hall effect sensor for detecting the angular position of a BLM rotor; a second input for receiving a digital pulse width modulated speed control signal; and first circuitry for generating first and second drive signals based on the digital position signal, the first and second drive signals each comprising alternating driving intervals and non-driving intervals, the first and second drive signals for driving a BLM electromagnet with current of a first polarity during driving intervals of the first drive signal, and for driving the BLM electromagnet with current of a second, opposite polarity during driving intervals of the second drive signal, wherein the driving intervals of the first drive signal are temporally spaced from the driving intervals of the second drive signal such that endings of the driving intervals of the first drive signal do not coincide with the beginning of the driving intervals of the second drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electronic circuit for controlling a brushless motor (BLM), the electronic circuit comprising:
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first and second inputs for receiving first and second digital position signals from respective first and second Hall effect sensors, the first and second Hall effect sensors for detecting the angular position of a BLM rotor; first circuitry for generating first and second drive signals based on the first and second digital position signals, the first and second drive signals each comprising alternating driving intervals and non-driving intervals, the first and second drive signals for driving a BLM electromagnet with current of a first polarity during driving intervals of the first drive signal, and for driving the BLM electromagnet with current of a second, opposite polarity during driving intervals of the second drive signal; second circuitry for generating the Boolean logical XOR logical combination of the first and second digital position signals; a first pulse generator for generating transition pulses in response to rising edges of the XOR logical combination of the first and second digital position signals; and third circuitry for generating the Boolean logical AND combination of the first position signal with the transition pulses from the first pulse generator, and for generating the Boolean logical AND combination of the logical complement of the first position signal with the transition pulses from the first pulse generator. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for controlling a brushless motor (BLM), the method comprising:
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electronically receiving a digital position signal from a Hall effect sensor, the Hall effect sensor for detecting the angular position of a BLM rotor; electronically generating first and second drive signals based on the digital position signal, the first and second drive signals each comprising alternating driving intervals and non-driving intervals, the first and second drive signals for driving a BLM electromagnet with current of a first polarity during driving intervals of the first drive signal, and for driving the BLM electromagnet with current of a second, opposite polarity during driving intervals of the second drive signal; and electronically causing temporal spacing between the driving intervals of the first drive signal and the driving intervals of the second drive signal. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification