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    • 5. 发明授权
    • Reference frequency and low voltage detector circuit
    • 参考频率和低电压检测电路
    • US4568877A
    • 1986-02-04
    • US531989
    • 1983-09-12
    • Timothy M. Tinsley
    • Timothy M. Tinsley
    • G01R19/155G01R19/00
    • G01R19/155
    • A reference frequency and low voltage detector circuit for use with a constant frequency A.C. voltage source is disclosed in which a first supply circuit supplies a first voltage wave form having a repetition rate and magnitude proportional to the A.C. source voltage. A second supply circuit supplies a regulated D.C. voltage of a fixed magnitude as long as the amplitude of the A.C. source voltage is normal. The voltages produced by the first and second supply circuits are supplied to noninverting and inverting input terminals of a differential amplifier which produces a rectangular wave output signal only when the A.C. source voltage is normal. The differential amplifier output signal provides a frequency reference under normal conditions and signals a user device to switch to a secondary mode of operation when the repetition rate of the rectangular wave form changes.
    • 公开了一种用于恒定频率交流电压源的参考频率和低电压检测器电路,其中第一电源电路提供具有与交流电源电压成比例的重复率和幅度的第一电压波形。 只要交流电源电压的幅度正常,第二电源电路就提供固定幅度的调节直流电压。 由第一和第二电源电路产生的电压被提供给差分放大器的非反相和反相输入端,该差分放大器仅在交流电源电压正常时产生矩形波输出信号。 差分放大器输出信号在正常条件下提供频率参考,并且当矩形波形的重复率改变时,信号用户设备切换到次要操作模式。
    • 7. 发明授权
    • Locally powered control system having a remote sensing unit with a two
wire connection
    • 本地供电的控制系统具有带两线连接的遥感单元
    • US5635896A
    • 1997-06-03
    • US174568
    • 1993-12-27
    • Timothy M. TinsleyEdward L. Schwarz
    • Timothy M. TinsleyEdward L. Schwarz
    • G05D23/19G08C19/16H04B3/54H04M11/04
    • H04B3/548G05D23/1905G08C19/16H04B2203/5425H04B2203/5458H04B2203/547
    • A communication system comprises a remote switching module having two signal terminals connected by just two conductors to the signal terminals of a local decoding module. Power is directly provided only to the local decoding module, which applies DC voltage of a first level across the conductors. The remote switching module has a voltage regulator which provides power of a second voltage level lower than the first level for operating a control unit in the switching module. The control unit controls a variable impedance having higher and lower impedance levels and which is connected across the switching module's signal terminals. The decoding module can detect the different impedance levels by sensing the current flow on the conductors. The switching module communicates with the decoding module by modulating the time intervals between changes in impedance levels. The system has particular utility for retrofitting cooling to a heating systems where preexisting thermostat wiring has only two conductors, say when an air conditioning function is added to a previously heat only system. The system is also useful when installing electronic thermostats on heating and cooling systems originally controlled by a mechanical thermostat.
    • 通信系统包括具有两个信号端的远程开关模块,两个信号端子仅通过两个导体连接到本地解码模块的信号端。 电源直接提供给本地解码模块,该模块在导体之间施加第一级的直流电压。 远程开关模块具有电压调节器,其提供低于第一电平的第二电压电平的功率,用于操作开关模块中的控制单元。 控制单元控制具有更高和更低阻抗水平的可变阻抗,并且其连接在开关模块的信号端子两端。 解码模块可以通过感测导体上的电流来检测不同的阻抗水平。 开关模块通过调制阻抗电平变化之间的时间间隔与解码模块进行通信。 该系统具有特殊的用途,用于将冷却装置加热到其中预先存在的恒温器布线仅具有两个导体的加热系统,例如当将空调功能添加到以前仅加热的系统时。 在原来由机械恒温器控制的加热和冷却系统上安装电子恒温器时,该系统也很有用。