US 12,231,066 B2
Two degrees of control through pulse width modulation interface
Jonathan Blake, Newington, CT (US); Michael S. Smyth, Andrews, IN (US); and Luis Arnedo, South Glastonbury, CT (US)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed by Carrier Corporation, Palm Beach Gardens, FL (US)
Filed on Jul. 12, 2022, as Appl. No. 17/862,953.
Claims priority of provisional application 63/222,777, filed on Jul. 16, 2021.
Prior Publication US 2023/0015020 A1, Jan. 19, 2023
Int. Cl. G05B 5/00 (2006.01); F25B 49/02 (2006.01); H02H 7/08 (2006.01); H02P 1/04 (2006.01); H02P 23/14 (2006.01)
CPC H02P 23/14 (2013.01) [F25B 49/025 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method of operating a heating, ventilation, and/or air conditioning (HVAC) system, comprising:
transmitting, using an equipment control board, an operation request in a pulse width modulation (PWM) signal to an electronically commutate motor (ECM) controller of a blower motor, wherein the operation request comprises a switching period command configured to vary a switching period of the PWM signal;
operating the blower motor in accordance with the operation request by varying the switching period of the PWM signal;
detecting a parameter of the blower motor for each of a plurality of switching periods as the switching period varies; and
mapping the parameter of the blower motor for each of the plurality of switching periods;
the method further comprising:
transmitting, using the equipment control board, a second operation request in a second PWM signal to the ECM controller of the blower motor, wherein the second operation request comprises a second switching period command configured to hold a second switching period of the second PWM signal fixed; and
operating the blower motor in accordance with the second operation request by varying the duty cycle of the second PWM signal and holding the second switching period fixed;
detecting a second parameter of the blower motor for each second operation request; and
mapping the second parameter of the blower motor for each of the second operation requests.