PHASE LOGIC CIRCUITS FOR CONTROLLING MOTORS
First Claim
1. An electronic circuit for controlling a brushless motor (BLM), the electronic circuit comprising:
- 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;
a third input for receiving a digital pulse width modulated speed control signal;
a first logic gate for generating a first drive signal that comprises a Boolean logical combination of the first digital position signal and the speed control signal, the first drive signal for controlling a first full bridge configuration of power switches communicatively coupled to a first plurality of BLM electromagnets; and
a second logic gate for generating a second drive signal that comprises a Boolean logical combination of the second digital position signal and the speed control signal, the second drive signal for controlling a second full bridge configuration of power switches communicatively coupled to a second plurality of BLM electromagnets.
14 Assignments
0 Petitions
Accused Products
Abstract
Circuitry for controlling motors, 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 of which may comprise a logical combination (e.g., a logical AND combination) of the speed control signal and a rotor position signal, for controlling power switches that are coupled to electromagnets of the BLM.
93 Citations
31 Claims
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1. 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; a third input for receiving a digital pulse width modulated speed control signal; a first logic gate for generating a first drive signal that comprises a Boolean logical combination of the first digital position signal and the speed control signal, the first drive signal for controlling a first full bridge configuration of power switches communicatively coupled to a first plurality of BLM electromagnets; and a second logic gate for generating a second drive signal that comprises a Boolean logical combination of the second digital position signal and the speed control signal, the second drive signal for controlling a second full bridge configuration of power switches communicatively coupled to a second plurality of BLM electromagnets. - 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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a first input to receive a first position signal from a first sensor that detects the angular position of magnetic poles on a BLM rotor, the first position signal having active periods and inactive periods; a second input to receive a second position signal from a second sensor that detects the angular position of magnetic poles on the BLM rotor, the second position signal having active periods and inactive periods; control circuitry to receive the first position signal, the second position signal, and a speed control signal, and to generate first and second drive signals based on the position and speed control signals, wherein the first and second drive signals each comprise a plurality of inactive periods that correspond to the respective inactive periods of the first and second position signals, and wherein the first and second drive signals each further comprise a plurality of pulses that correspond to each of the respective active periods of the first and second position signals, a first bridge configuration of switches for receiving the first drive signal, and for coupling a power source to a first drive output during each of the plurality of pulses of the first drive signal; and a second bridge configuration of switches for receiving the second drive signal, and for coupling the power source to a second drive output during each of the plurality of pulses of the second drive signal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An electronic method for controlling a brushless motor (BLM), the electronic method comprising:
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electronically 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 magnetic north poles on a BLM rotor; electronically receiving a digital pulse width modulated speed control signal; electronically generating a first drive signal that comprises a logical combination of the first digital position signal and the speed control signal, the first drive signal for controlling a first set of one or more power switches communicatively coupled to a first set of one or more BLM electromagnets; and electronically generating a second drive signal that comprises a logical combination of the second digital position signal and the speed control signal, the second drive signal for controlling a second set of one or more power switches communicatively coupled to a second set of one or more BLM electromagnets. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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Specification