US 12,244,249 B1
System and method for advanced electronic starting switch assembly for split-phase induction motors for domestic dryers
Dingsheng Lin, Venetia, PA (US); Zheng Zhang, Saint Joseph, MI (US); Qianjie Ye, Jinan (CN); Hailing Li, Jinan (CN); Jiyi Sun, Jinan (CN); Jie Liu, Jinan (CN); Changping Yang, Shenzhen (CN); Wangyong Liu, Shenzhen (CN); and Shudong Zhu, Shenzhen (CN)
Assigned to Wolong Electric Group Co., Ltd., Zhejiang (CN)
Filed by Wolong Electric Group Co., Ltd., Zhejiang (CN)
Filed on Sep. 11, 2024, as Appl. No. 18/882,156.
Int. Cl. H02P 1/42 (2006.01); D06F 34/08 (2020.01); D06F 34/10 (2020.01); D06F 34/20 (2020.01); D06F 58/26 (2006.01); D06F 58/38 (2020.01); D06F 103/24 (2020.01); D06F 103/46 (2020.01); D06F 105/28 (2020.01); D06F 105/48 (2020.01); G01R 31/34 (2020.01); H02P 1/02 (2006.01); H02P 23/00 (2016.01); H02P 23/14 (2006.01); H02P 25/062 (2016.01); H05K 7/20 (2006.01)
CPC H02P 1/42 (2013.01) [D06F 34/08 (2020.02); D06F 34/10 (2020.02); D06F 34/20 (2020.02); D06F 58/26 (2013.01); D06F 58/38 (2020.02); G01R 31/343 (2013.01); H02P 1/028 (2013.01); H02P 23/0004 (2013.01); H02P 23/14 (2013.01); H02P 25/062 (2016.02); H05K 7/209 (2013.01); D06F 2103/24 (2020.02); D06F 2103/46 (2020.02); D06F 2105/28 (2020.02); D06F 2105/48 (2020.02)] 22 Claims
OG exemplary drawing
 
1. An electronic starting switch assembly for controlling operation of a dryer having a heating element and having a split-phase induction motor having a main winding and an auxiliary winding wrapped around a stator for rotation of a rotor having a rotor speed, an induction motor power supply and a heater element power supply, the electronic starting switch assembly comprising:
a microcontroller unit (MCU) configured to execute a control method for operating the dryer, including control of the split-phase induction motor of the dryer;
a memory configured to store parameters for a crossover condition;
sensing circuitry for sensing characteristics of the split-phase induction motor;
power switch circuits configured to connect and disconnect the auxiliary winding of the split-phase induction motor and the heater element respectively to the induction motor power supply and the heater element power supply;
wherein the MCU is configured to:
load a crossover coefficient from memory;
connect the auxiliary winding to the induction motor power supply to start ramping the rotor speed during a starting period of operation;
real-time sample a main winding current and an auxiliary winding current to generate a real-time samplings of the main winding current and the auxiliary winding current;
calculate stabilized startup forward magnitude current based on the main winding current and the auxiliary winding current;
determine and store in memory a crossover condition based on the stabilized startup forward magnitude current and the crossover coefficient;
monitor startup real-time forward magnitude current based on the real-time samplings of the main winding current and the auxiliary winding current during a startup period where the auxiliary winding is connected to the induction motor power supply;
determine that the startup real-time forward magnitude current meets the crossover condition and in response 1) disconnect the auxiliary winding from the induction motor power supply; and 2) connect the heater element to the heater element power supply.