Voltage adapter systems for use in an appliance

摘要

Voltage adapter systems for use in an appliance are provided. An exemplary voltage adapter system can include a TRIAC. The exemplary voltage adapter system can include a voltage detection circuit configured to detect an input voltage of an alternating current power signal and connect the TRIAC in series with a load of the appliance when the input voltage is greater than a threshold voltage. The exemplary voltage adapter system can include 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. An exemplary firing angle control circuit can include a resistor, a capacitor, and a DIAC. The exemplary firing angle control circuit can be configured to trigger the TRIAC when the voltage across the capacitor exceeds a breakover voltage associated with the DIAC.

主权项

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.