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    • 4. 发明授权
    • Self-calibrating electric clock circuit
    • 自校准电时钟电路
    • US4228346A
    • 1980-10-14
    • US907550
    • 1978-05-19
    • Charles E. Barker
    • Charles E. Barker
    • G04G3/00G06M3/12
    • G04G3/00
    • A clock circuit designed to keep time based upon a known frequency of an alternating current power supply is provided with a d.c. power backup system to operate the clock circuit during periods of a.c. power failure. The clock circuit includes a high frequency oscillator which generates a large number of timing pulses for each alternating current power cycle. During periods of normal operation on alternating current power, the number of oscillator timing pulses occurring between successive null points in the alternating current power supply waveform are counted and stored. When the clock circuit is operated from the d.c. power supply during periods of a.c. power failure, the last count of timing pulses between successive null points in the a.c. cycle is loaded as an initial count into a counter. The counter is decremented down to zero, whereupon the counter registers the passage of a period of time corresponding to the time interval between two null points in the a.c. power cycle, at that time no longer present. This count is used to update a time recorder to maintain accurate time even during periods of power failure.
    • 设计为基于交流电源的已知频率保持时间的时钟电路具有直流 电源备用系统在一段时间内操作时钟电路。 电源(检测)失败。 时钟电路包括高频振荡器,其产生用于每个交流电周期的大量定时脉冲。 在交流电力的正常工作期间,对交流电源波形中的连续零点之间出现的振荡器定时脉冲的数量进行计数和存储。 当时钟电路从直流电 电力供应。 电源故障,直流电源连续零点之间的定时脉冲的最后计数。 循环作为初始计数加载到计数器中。 计数器减少为零,因此计数器登记一段时间的通过,这段时间对应于a.c.中两个空点之间的时间间隔。 动力循环,当时不再存在。 该计数用于更新时间记录器,以便在电源故障期间保持准确的时间。
    • 6. 发明授权
    • High speed CMOS comparator circuit
    • 高速CMOS比较电路
    • US4410813A
    • 1983-10-18
    • US292772
    • 1981-08-14
    • Charles E. BarkerMichael D. Smith
    • Charles E. BarkerMichael D. Smith
    • H03K5/153H03K3/02H03K19/003H03K19/0948
    • H03K19/00384H03K19/0948
    • A high speed comparator comprising an operational amplifier and two inverter portions is provided. The output voltage of the operational amplifier biases a control transistor coupled to the first inverter portion which is coupled to the operational amplifier in a closed loop. A stable reference voltage is coupled to an input of the operational amplifier and forces the switch point of the first inverter to be at the reference voltage. If the second inverter portion comprises transistors having the gate dimensions thereof sized the same as the transistors of the first inverter portion, the switch point of the second inverter is also at the reference voltage. The switch point of the fast comparator has thereby been isolated from process and temperature variations.
    • 提供了一种包括运算放大器和两个逆变器部分的高速比较器。 运算放大器的输出电压偏置耦合到第一反相器部分的控制晶体管,该第一反相器部分以闭环耦合到运算放大器。 稳定的参考电压耦合到运算放大器的输入,并迫使第一反相器的开关点处于参考电压。 如果第二反相器部分包括具有与第一反相器部分的晶体管相同的栅极尺寸的晶体管,则第二反相器的开关点也处于参考电压。 因此,快速比较器的切换点与过程和温度变化隔离开来。
    • 7. 发明授权
    • Pulsing probe for microwave oven
    • 微波炉脉冲探头
    • US4220840A
    • 1980-09-02
    • US907670
    • 1978-05-19
    • Charles E. Barker
    • Charles E. Barker
    • G05D23/24H05B6/68H05B9/06
    • H05B6/6432G05D23/1913G05D23/24H05B6/6452
    • A microwave oven cooking control system is provided with a comestible probe for temperature sampling. The comestible probe is only intermittently energized so that self-heating is avoided. Energization of the probe is under the control of a timing mechanism, which concurrently produces a voltage signal that rapidly increments in steps corresponding to possible internal temperatures of the comestible. The voltage signal is compared against a reference voltage level, which in turn is governed by the internal temperature of the comestible as sensed by the probe. The comparison results are used to deactuate energization of the probe and to control the microwave energy transmitted to the comestible by the microwave oven magnetron. A threshold a.c. current detector is also connected to said magnetron control to deactuate operation of the magnetron when a low amplitude a.c. power signal is received.
    • 微波炉烹饪控制系统配有可食用探头进行温度采样。 可食用探针仅间歇地通电,避免了自热。 探头的通电受定时机制的控制,定时机构同时产生电压信号,该电压信号相应于可食物的可能的内部温度而逐步增加。 将电压信号与参考电压电平进行比较,参考电压电平又由探头感测到的可食物的内部温度决定。 比较结果用于停用探针的通电并控制由微波炉磁控管传输到食物的微波能量。 门槛a.c. 电流检测器也连接到所述磁控管控制器,以在低振幅a.c.时停止磁控管的操作。 接收电源信号。