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    • 51. 发明授权
    • Output power control circuit for a mobile radio apparatus
    • 用于移动无线电设备的输出功率控制电路
    • US4870698A
    • 1989-09-26
    • US113115
    • 1987-10-27
    • Tsutomu KatsuyamaIsao YoshidaToyoo KanaiYasunobu Taguchi
    • Tsutomu KatsuyamaIsao YoshidaToyoo KanaiYasunobu Taguchi
    • H04B1/40H03G3/20H04B1/036H04B1/04H04B7/005H04B7/26
    • H04W52/52H04B1/036H04B2001/0416H04W52/36Y02B60/50
    • An output power control circuit is provided in a casing of a mobile radio apparatus together with an automatic power control circuit and an RF signal amplifier. The output power control circuit applied level control signals to the automatic power control circuit for maintaining the power level of the output RF signal of the RF amplifier at one of a plurality of output power levels corresponding to the level control signals. The output power control circuit has a receiver, a temperature sensing circuit and a logic circuit. The receiver receives RF signals transmitted by a master station and detects power level setting command signals included in the received RF signal. The temperature sensing circuit detects an internal temperature of the casing and provides a power reduction signal upon detecting that the internal temperature has exceeded a predetermined temperature. The logic circuit receives the power level setting command signal from said receiver, and generates a level control signal for determining an output power level corresponding to the power level setting command signal, and generates a level control signal for determining an output power level which is lower than that specified by the power level setting command signal upon receiving the power reduction signal from the temperature sensing circuit.
    • 输出功率控制电路与自动功率控制电路和RF信号放大器一起设置在移动无线电设备的壳体中。 输出功率控制电路将电平控制信号施加到自动功率控制电路,用于将RF放大器的输出RF信号的功率电平维持在与电平控制信号对应的多个输出功率电平中的一个上。 输出功率控制电路具有接收器,温度检测电路和逻辑电路。 接收机接收由主站发送的RF信号,并且检测包括在所接收的RF信号中的功率电平设置命令信号。 温度检测电路检测到壳体的内部温度,并且在检测到内部温度已经超过预定温度时提供功率降低信号。 逻辑电路接收来自所述接收机的功率电平设定命令信号,并产生用于确定与功率电平设定指令信号对应的输出功率电平的电平控制信号,并生成电平控制信号,以确定较低的输出功率电平 比从温度检测电路接收到功率降低信号时由功率电平设定指令信号指定的值高。
    • 53. 发明授权
    • Overcurrent protection apparatus for DC motor
    • 直流电机过电流保护装置
    • US4473856A
    • 1984-09-25
    • US335358
    • 1981-12-29
    • Kenichiroh TakahashiHiromitsu NakanoIsao Yoshida
    • Kenichiroh TakahashiHiromitsu NakanoIsao Yoshida
    • H02H7/085H02H3/093H02H7/08
    • H02H7/0833
    • An overcurrent protection apparatus for a DC motor which can be used with a speed control system of a DC motor to prevent an overcurrent condition arising when the DC motor is run with a heavy load or locked by an overload from burning or overheating windings of the motor. The apparatus is constructed using at least one integrated circuit and includes a current mirror circuit for detecting an overcurrent and for cutting off the supply current of the DC motor. A timing circuit prevents overcurrents lasting only a short time from triggering the apparatus to shut down the motor. Once the apparatus is triggered to shut off the motor, the motor will remain off for an indefinite period of time until the apparatus is reset.
    • 一种用于直流电动机的过电流保护装置,其可与直流电动机的速度控制系统一起使用,以防止当直流电动机由重负载运行或被电动机的燃烧或过热绕组过载锁定时产生的过电流条件 。 该装置使用至少一个集成电路构造,并且包括用于检测过电流并用于切断直流电动机的供电电流的电流镜电路。 定时电路可防止持续时间短的过电流触发装置关闭电机。 一旦设备触发关闭电机,电机将保持关闭无限期,直到设备复位为止。