US 12,424,924 B2
Alternating current control system
Hui-Chiang Yang, Taipei Hsien (TW); and Chia-Chang Lin, New Taipei (TW)
Assigned to NIKO SEMICONDUCTOR CO., LTD., New Taipei (TW)
Filed by NIKO SEMICONDUCTOR CO., LTD., New Taipei (TW)
Filed on Mar. 16, 2023, as Appl. No. 18/184,793.
Claims priority of application No. 111144901 (TW), filed on Nov. 24, 2022.
Prior Publication US 2024/0178745 A1, May 30, 2024
Int. Cl. H02M 1/08 (2006.01); H02M 1/36 (2007.01)
CPC H02M 1/083 (2013.01) [H02M 1/36 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An alternating current control system, which is adapted to an alternating current power source, the alternating current control system comprising:
a zero-crossing detector including an alternating current signal processing circuit and an optocoupler, wherein the alternating current signal processing circuit is electrically connected to the alternating current power source, and the optocoupler is electrically connected to the alternating current signal processing circuit and outputs a zero crossing detection signal;
a microcontroller including a first control pin, a second control pin, and a third control pin, wherein the first control pin is electrically connected to the optocoupler for receiving the zero crossing detection signal, the second control pin receives a switch state signal, and the third control pin outputs a control signal;
a constant current driver electrically connected to the third control pin for receiving the control signal;
an alternating current solid state relay electrically connected between the constant current driver and the alternating current power source; and
a switch device, connected to the second control pin and configured to output a switch state signal to the second control pin;
wherein, when the microcontroller determines that the switch device is switched from a closed state to an open state at a first time point according to a change of the switch state signal, the microcontroller activates an electrical connection between the alternating current solid state relay and the alternating current power source at a second time point, wherein the second time point is later than the first time point and a time difference between the second time point and the first time point is at least one pulse period of the zero crossing detection signal;
wherein, when the microcontroller determines that the switch device is switched from the open state to the closed state at a third time point based on the change of the switch state signal, the microcontroller deactivates the electrical connection between the alternating current solid state relay and the alternating current power source at a fourth time point, wherein the fourth time point is later than the third time point and a time difference between the fourth time point and the third time point is at least one pulse cycle of the zero crossing detection signal.