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1. 发明授权

US11871493B2 Timing adjustments for accurate zero-crossing determination 有权
公开(公告)号：US11871493B2
公开(公告)日：2024-01-09
申请号：US17804005
申请日：2022-05-25
申请人： Leviton Manufacturing Co., Inc.
发明人： Brian Anthony Yokum , Ronald James Gumina
IPC分类号： H05B47/10
CPC分类号： H05B47/10
摘要： Timing adjustment for accurate zero-crossing determination includes obtaining time offset(s) representing amounts of time between (i) zero-crossings of an input signal waveform, representative of an input AC waveform, input to a zero-crossing detector circuit and (ii) corresponding transitions of an output signal from an output of the circuit to a microcontroller, and determining times of the zero-crossings of the input AC waveform, which includes determining times of the corresponding transitions as detected by the microcontroller and adjusting the determined times using the time offset(s) to produce the times of the zero-crossings of the input AC waveform. In another aspect, input AC frequency is determined by determining pulse width(s) of pulse(s) of the output signal, and adjusting a half-cycle time corresponding to the pulse width(s) using the time offset(s) to provide a duration of half-cycles of the input AC waveform and inform a frequency of the input AC waveform.

2. 发明授权

US11777400B2 Switching control in electrical load controllers 有权
公开(公告)号：US11777400B2
公开(公告)日：2023-10-03
申请号：US18049348
申请日：2022-10-25
申请人： Leviton Manufacturing Co., Inc.
发明人： Brian Anthony Yokum , Ronald James Gumina
IPC分类号： H02M5/293 , H02M1/08 , H02M1/00
CPC分类号： H02M1/083 , H02M1/0058 , H02M5/293
摘要： Operating an electrical load controller includes, in one aspect, detecting zero-crossings of an AC waveform, determining periods each corresponding to a full cycle of the AC waveform, determining a frequency of the AC waveform based on the determined periods, and controlling a supply of AC power to a load based thereon using the determined frequency to fire a switching circuit of the electrical load controller. In another aspect, a method includes maintaining a minimum on-time for which a control signal to the switching circuit is to remain in an ON state to fire the switching circuit; based on a desired load level setting of the electrical load controller, setting a corresponding control signal turn-on time to turn the control signal to the ON state to conduct the supply of AC power to the load, the control signal turn-on time corresponding to a firing angle of half cycles of the AC power; selecting a control signal turn-off time to turn the control signal to the OFF state, where the selecting is made between (i) a first turn-off time equal to the set turn-on time plus the minimum on-time, and (ii) a second turn-off time equal to a default turn-off time for turning the control signal to the OFF state, the control signal turn-off time corresponding to a second angle of half cycles of the AC power; and controlling the supply of AC power to the load by selectively controlling the switching circuit to conduct the supply of AC power to the load, the controlling the supply of AC power to the load including: based on turning the control signal to the ON state during a half cycle of the AC power at the set control signal turn-on time, holding the control signal in the ON state until the selected control signal turn-off time during the half cycle.

3. 发明授权

US11515779B2 Switching control in electrical load controllers 有权
公开(公告)号：US11515779B2
公开(公告)日：2022-11-29
申请号：US17325164
申请日：2021-05-19
申请人： Leviton Manufacturing Co., Inc.
发明人： Brian Anthony Yokum , Ronald James Gumina
IPC分类号： H02M5/293 , H02M1/08 , H02M1/00
摘要： Operating an electrical load controller includes, in one aspect, detecting zero-crossings of an AC waveform, determining periods each corresponding to a full cycle of the AC waveform, determining a frequency of the AC waveform based on the determined periods, and controlling a supply of AC power to a load based thereon using the determined frequency to fire a switching circuit of the electrical load controller. In another aspect, a method includes maintaining a minimum on-time for which a control signal to the switching circuit is to remain in an ON state to fire the switching circuit; based on a desired load level setting of the electrical load controller, setting a corresponding control signal turn-on time to turn the control signal to the ON state to conduct the supply of AC power to the load, the control signal turn-on time corresponding to a firing angle of half cycles of the AC power; selecting a control signal turn-off time to turn the control signal to the OFF state, where the selecting is made between (i) a first turn-off time equal to the set turn-on time plus the minimum on-time, and (ii) a second turn-off time equal to a default turn-off time for turning the control signal to the OFF state, the control signal turn-off time corresponding to a second angle of half cycles of the AC power; and controlling the supply of AC power to the load by selectively controlling the switching circuit to conduct the supply of AC power to the load, the controlling the supply of AC power to the load including: based on turning the control signal to the ON state during a half cycle of the AC power at the set control signal turn-on time, holding the control signal in the ON state until the selected control signal turn-off time during the half cycle.

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