| 摘要 |
A doorbell device is provided. The doorbell device includes a user interface, a control circuit, a power switching circuit, a first capacitor, a second capacitor, and a charge/discharge control circuit. The user interface includes a button. The control circuit is coupled to the user interface and generates a power control signal according to a state of the button. The power switching circuit is coupled to the control circuit and outputs a first voltage signal at a first node to supply power to the control circuit according to the power control signal. The first capacitor is coupled to the first node. The charge/discharge control circuit is coupled between the first node and the second capacitor and controls whether the second capacitor is charged or discharged according to the first voltage signal. |
| 主权项 |
1. A doorbell device, comprising:
a user interface, comprising a button; a control circuit, coupled to the user interface, for generating a power control signal according to a state of the button; a power switching circuit, coupled to the control circuit, for outputting a first voltage signal at a first node to supply power to the control circuit according to the power control signal; a first capacitor, coupled to the first node; a second capacitor; and a charge/discharge control circuit, coupled between the first node and the second capacitor, for controlling whether the second capacitor is charged or discharged according to the first voltage signal. |
