| 摘要 |
<p>An access control device for communication power supply storage battery is applied to the communication technology field. The device comprises an Alternating Current (AC)/battery voltage detection circuit, sequential control circuit, a relay and the first MOS transistor. The AC/DC voltage detection circuit is set for detecting the on-off of the system AC and the residual electricity of a storage battery, and inputting a detection result to the sequential control circuit. The two output ends of the sequential control circuit are respectively connected with the gate electrode of the first MOS transistor, and the input end of the relay, the sequential control circuit is used for controlling the first MOS transistor to switch on and the relay contact to switch off when the system AC is powered off and the battery voltage is lower than the threshold value; and controlling the relay to be switched on when the system AC is powered on, so as to realize the normal access of a system. The source electrode and the drain electrode of the first MOS transistor are respectively connected with the two ends of the relay contact. By adopting the device, the requirements of miniaturization and embedded installation of power supply systems can be satisfied.</p> |
