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公开(公告)号：US5426416A
公开(公告)日：1995-06-20
申请号：US963711
申请日：1992-10-19
CPC分类号： G01R31/006 , G01R19/0092
摘要： A high-amperage current sensor is disclosed which is suitable for use in an automotive electrical system and which is operatively unaffected by changes in ambient temperature. The current sensor utilizes a shunt assembly having at least one low-resistance shunt element connectable in line between a source of electrical energy and a load. Circuitry preferably configured on an application specific integrated circuit measures voltage drop across the shunt element due to current flow. As a result, an output signal is produced which may be fed to external circuitry for further processing. In presently preferred embodiments, the sensor may comprise analog circuitry producing an analog output signal and/or digital circuitry producing a digital output signal.
摘要翻译： 公开了一种适用于汽车电气系统的高安培电流传感器，其不受环境温度变化的影响。 电流传感器利用分流组件，其具有可连接在电能源和负载之间的至少一个低电阻分流元件。 优选地在专用集成电路上配置的电路测量由于电流而跨越分流元件的电压降。 结果，产生可以被馈送到外部电路进行进一步处理的输出信号。 在目前优选的实施例中，传感器可以包括产生模拟输出信号的模拟电路和/或产生数字输出信号的数字电路。
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公开(公告)号：US5084868A
公开(公告)日：1992-01-28
申请号：US193698
申请日：1988-05-13
IPC分类号： G08C15/04
CPC分类号： G08C15/04
摘要： The present invention is a multimode sensor system that transmits power down a common bus coaxial cable typically using an alternating current power source. Each remote unit connected to the coaxial cable and through an isolation transformer converts the alternating current power to direct current power for an integrated circuit bus interface. The interface is connected to the sensors. The interface is externally pin programmable to provide a carrier at a frequency for a channel assigned to the remote unit. The carrier is provided by a ripple counter producing a frequency divided signal compared to a fixed reference frequency, where the result of the comparison controls a voltage controlled oscillator. When plural low frequency analog signals are to be transmitted over the common bus, an on-chip multiplexer multiplexes the signals to an off-chip, external analog-to-digital converter. The analog-to-digital converter loads an on chip parallel to serial register that applies each bit of the sampled signal serially to an on chip Manchester encoder. The encoder modifies the input voltage of the voltage controlled oscillator operating at the carrier frequency. The oscillator signal is applied to the coaxial cable. Receivers at the end of the coaxial cable are each tunable to a designated carrier frequency and each decode the respective encoded signal. If a high frequency analog signal is supplied to the voltage controlled oscillator, the carrier is modulated by the high frequency signal and the receiver demodulates the signal. The integrated circuit is arranged so that the digital circuitry is generally isolated from the analog circuitry so noise immunity is enhanced.
摘要翻译： 本发明是一种多模传感器系统，其通常使用交流电源将公共总线同轴电缆发射功率。 连接到同轴电缆并通过隔离变压器的每个远程单元将交流电力转换为用于集成电路总线接口的直流电力。 接口连接到传感器。 该接口是外部可编程的，以便为分配给远程单元的通道提供一个频率的载波。 载波由波纹计数器提供，产生与固定参考频率相比的分频信号，其中比较结果控制压控振荡器。 当通过公共总线传输多个低频模拟信号时，片上多路复用器将信号复用到片外外部模数转换器。 模数转换器将片上并行串行寄存器加载，将串行采样信号的每一位应用于片上曼彻斯特编码器。 编码器修改以载波频率工作的压控振荡器的输入电压。 振荡器信号施加到同轴电缆。 同轴电缆末端的接收机各自可调谐到指定的载波频率，并且每个解码相应的编码信号。 如果将高频模拟信号提供给压控振荡器，则载波由高频信号调制，并且接收机解调该信号。 集成电路被布置成使得数字电路通常与模拟电路隔离，因此增强了抗噪声性。
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公开(公告)号：US4770842A
公开(公告)日：1988-09-13
申请号：US934238
申请日：1986-11-20
CPC分类号： G08C15/04
摘要： The present invention is a multimode sensor system that transmits power down a common bus coaxial cable typically using an alternating current power source. Each remote unit connected to the coaxial cable and through an isolation transformer converts the alternating current power to direct current power for an integrated circuit bus interface. The interface is connected to the sensors. The interface is externally pin programmable to provide a carrier at a frequency for a channel assigned to the remote unit. The carrier is provided by a ripple counter producing a frequency divided signal compared to a fixed reference frequency, where the result of the comparison controls a voltage controlled oscillator. When plural low frequency analog signals are to be transmitted over the common bus, an on-chip multiplexer multiplexes the signals to an off-chip, external analog-to-digital converter. The analog-to-digital converter loads an on chip parallel to serial register that applies each bit of the sampled signal serially to an on chip Manchester encoder. The encoder modifies the input voltage of the voltage controlled oscillator operating at the carrier frequency. The oscillator signal is applied to the coaxial cable. Receivers at the end of the coaxial cable are each tunable to a designated carrier frequency and each decode the respective encoded signal. If a high frequency analog signal is supplied to the voltage controlled oscillator, the carrier is modulated by the high frequency signal and the receiver demodulates the signal. The integrated circuit is arranged so that the digital circuitry is generally isolated from the analog circuitry so noise immunity is enhanced.
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