An electronic device includes a housing, a chip card received in the housing, and a chip card protecting cover assembly. A maximum worst-case excitation input is generated. A method for thermal ablation therapy using ultrasound energy involves positioning an ultrasound device in an undeployed position proximate to tissue to be heated; moving the ultrasound device from its undeployed position to a deployed position; and activating the ultrasound device to emit ultrasound energy for a predetermined period of time. Then, desired metal plating can be performed. The use of such a polycrystalline silicon raw material suppresses the local occurrence of the portions remaining unmelted, and can contribute to the stable production of single-crystalline silicon. The substrate-triggering control circuit is implemented with an active device, thereby reducing the chip size for the circuit and the loading effect on the pad.