Patent ID: 9419533
Filing Date: 2016-08-16
CPC Classification: H02M

Claim Text:
1. A voltage adapter system for use in an appliance, the voltage adapter system comprising: a TRIAC; a switching element configured to connect the TRIAC in series with a load of the appliance when a voltage detection circuit detects an input voltage of an alternating current power signal is greater than a threshold voltage; and a firing angle control circuit configured to provide a gate signal to a gate of the TRIAC when the alternating current power signal reaches a phase angle; wherein the firing angle control circuit comprises: a resistor providing a resistance; a capacitor providing a capacitance, wherein the capacitor is located in series with the resistor and downstream a path of current flow with respect to the resistor; and a DIAC connected between the first resistor, the first capacitor, and the gate of the TRIAC; wherein the resistor and the capacitor are connected in parallel with the TRIAC.