Three-phase detection module
First Claim
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1. A method comprising:
- receiving N power signals, each having a different one of N phases, over N power supply lines that supply power to a motor, wherein N is an integer greater than two;
using a first isolator, selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines;
using a second isolator, generating a signal based on the first current; and
selectively generating a phase failure signal when the signal is less than a predetermined threshold,wherein the first isolator includes a first optocoupler,wherein activating the first switch using the first isolator includes supplying current to a light emitter of the first optocoupler,wherein the second isolator includes a second optocoupler, andwherein generating the signal includes supplying a total current including the first current to a light emitter of the second optocoupler.
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Abstract
A method includes receiving N power signals, each having a different one of N phases, over N power supply lines, where N is an integer greater than two. The method further includes selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines. The method includes generating a signal based on the first current, and selectively generating a phase failure signal when the signal is less than a predetermined threshold.
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Citations
18 Claims
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1. A method comprising:
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receiving N power signals, each having a different one of N phases, over N power supply lines that supply power to a motor, wherein N is an integer greater than two; using a first isolator, selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines; using a second isolator, generating a signal based on the first current; and selectively generating a phase failure signal when the signal is less than a predetermined threshold, wherein the first isolator includes a first optocoupler, wherein activating the first switch using the first isolator includes supplying current to a light emitter of the first optocoupler, wherein the second isolator includes a second optocoupler, and wherein generating the signal includes supplying a total current including the first current to a light emitter of the second optocoupler. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving N power signals, each having a different one of N phases, over N power supply lines, wherein N is an integer greater than two; selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines; generating a signal based on the first current; selectively generating a phase failure signal when the signal is less than a predetermined threshold; and activating the first switch for a predetermined period of time based on a duration of one cycle of one of the N power signals, wherein the predetermined period is equal to the duration plus a predetermined value.
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17. A method comprising:
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receiving N power signals, each having a different one of N phases, over N power supply lines, wherein N is an integer greater than two; selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines; generating a signal based on the first current; selectively generating a phase failure signal when the signal is less than a predetermined threshold; selectively activating a second switch to allow a second current to flow from the second one of the N power supply lines to a third one of the N power supply lines; selectively activating a third switch to allow a third current to flow from the third one of the N power supply lines to the first one of the N power supply lines; activating the first switch; comparing the signal to a second predetermined threshold while the first switch is activated; after the signal exceeds the second predetermined threshold, alternately activating the second switch and the third switch; comparing the signal to the second predetermined threshold while the second switch is activated; comparing the signal to the second predetermined threshold while the third switch is activated; and generating a phase reversal signal in response to detecting the signal exceeding the second predetermined threshold while the third switch is activated prior to detecting the signal exceeding the second predetermined threshold while the second switch is activated.
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18. A method comprising:
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receiving N power signals, each having a different one of N phases, over N power supply lines, wherein N is an integer greater than two; selectively activating a first switch to allow a first current to flow from a first one of the N power supply lines to a second one of the N power supply lines; generating a signal based on the first current; selectively generating a phase failure signal when the signal is less than a predetermined threshold; selectively activating a second switch to allow a second current to flow from the second one of the N power supply lines to a third one of the N power supply lines; selectively activating a third switch to allow a third current to flow from the third one of the N power supply lines to the first one of the N power supply lines; activating the first switch; comparing the signal to a second predetermined threshold while the first switch is activated; after the signal exceeds the second predetermined threshold, alternately activating the second switch and the third switch; determining a first time at which the signal exceeds the second predetermined threshold while the second switch is activated; determining a second time at which the signal exceeds the second predetermined threshold while the third switch is activated; and generating a phase reversal signal in response to the first time being later than the second time.
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Specification