Abstract: The invention provides a control circuit of a switch device. A single output pin of the control unit outputs an enable signal to control terminals of two switch units to control an on-state of the two switch units, and adjust a current size of a control current of the on-state of the switch device. One of the switch units after receiving the enable signal for a predetermined time is switched to an off-state, so as to reduce power consumption of the switch device.

Abstract: A design of cognitive radio (CR) signal structure which based on the spectral correlation can be used for active sensing. In this signal structure, the known pilots used for the primary users (PUs) are duplicated and reallocated in the CR transmission signal properly. With this CR signal structure, the received signal of spectrum sensors will become correlated on the subcarriers when PU reoccupation occurs while the CR transmission is active, and thus PU activities can easily be detected by computing the spectral correlation function. As compare with the traditional cyclostationary feature detection scheme, this method can enhance the active sensing performance while remaining the service quality of the CR system, achieving better detection performance in the same detection time, reducing sensing time (about 1/10 of the traditional sensing time), and still reaching the satisfactory outcome even in the circumstances of low SNR and SINR.

Abstract: An AC/DC converter includes a rectifier circuit, at least one restraining unit, and a power interruption detection circuit. The rectifier circuit is used for converting an AC (alternating current) to a DC (direct current) power source. The restraining unit is connected to an output terminal of the AC power supply. The restraining unit includes a resistor and a switch connected in parallel. The power interruption detection circuit detects whether an input power cycle is regular. When the input power cycle is interruptive, a signal is generated to change a state of the switch in the restraining unit to make the resistor of the interfere in the circuit to restrain an inrush current in any operational circumstance, such as warm startup or quick startup.

Abstract: An AC/DC converter includes a rectifier circuit, at least one restraining unit, and a power interruption detection circuit. The rectifier circuit is used for converting an AC (alternating current) to a DC (direct current) power source. The restraining unit is connected to an output terminal of the AC power supply. The restraining unit includes a resistor and a switch connected in parallel. The power interruption detection circuit detects whether an input power cycle is regular. When the input power cycle is interruptive, a signal is generated to change a state of the switch in the restraining unit to make the resistor of the interfere in the circuit to restrain an inrush current in any operational circumstance, such as warm startup or quick startup.