| 摘要 |
<p>A switch status detection circuit includes three input terminals and a ground terminal. Two input terminals connect to a power supply via respective switches, receiving a respective voltage signal. The third connects to the power supply, receiving a neutral signal. A neutral synchronization circuit, between the third and the ground terminal, generates a positive pulsed current signal as a function of the neutral signal. Two capacitors, each with a respective first terminal connected to a corresponding input terminal, and a respective second terminal connected to the ground terminal, are charged by the current signal when the capacitors corresponding switch is in an off state. Respective output terminals are coupled to each capacitors first terminal to provide respective control signals, indicating the respective switch's state as a function of voltage level across that capacitor. Each control signal has a logic level corresponding to its respective switch's state.</p> |
