Patent ID: 11917738
Assignee: SAVANT TECHNOLOGIES LLC
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. A dummy load control method compatible with a triac dimmer, wherein a dummy load module for the triac dimmer and a dummy load control circuit comprising a capacitor are connected to a power supply input end, and the dummy load control method comprises:
in response to an input voltage of the power supply input end after rectification being an AC half-wave with a period of T when the power supply input end is not connected to the triac dimmer, and the input voltage after rectification being a phase-cut AC half-wave with the period T when the power supply input end is connected to the triac dimmer, and within the period T, a time period during which the voltage is a zero voltage in the phase-cut AC half-wave being longer than a time period during which the voltage is the zero voltage in the AC half-wave by at least a predetermined time interval,
controlling, using the input voltage of the power supply input end, charge/discharge time of the capacitor, so that: the voltage at one end of the capacitor is less than a first turn-on voltage when the power supply input end is connected to the triac dimmer, thereby enabling the dummy load module to be turned on when the power supply input end is connected to the triac dimmer and the input voltage of the power supply input end is between the zero voltage and a predetermined first power supply voltage; and the voltage at the one end of the capacitor is greater than the first turn-on voltage when the power supply input end is not connected to the triac dimmer, thereby enabling the dummy load module to be turned off when the power supply input end is not connected to the triac dimmer, and
wherein the first turn-on voltage is less than the first power supply voltage.