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    • 3. 发明授权
    • Alternating and direct current transformer using harmonic modulator
    • 使用谐波调制器的交流和直流电流互感器
    • US3710135A
    • 1973-01-09
    • US3710135D
    • 1971-01-15
    • TECHNICAL MANAGEMENT SERVICES
    • GILBERT R
    • H01F27/42H01F38/04H01F38/28H03C1/10H03K7/02H03K17/80
    • H01F27/427H01F38/04H01F38/28
    • The harmonic modulator, preferably a single-core second harmonic modulator, is made into a transformer capable of transforming both alternating and direct currents by the use of two output windings on the core, a ''''drive'''' winding and a ''''sense'''' winding. A high-gain amplifier is connected to the drive and sense windings in a first feed-back loop to quickly balance and maintain the voltage across the sense winding at zero, and to thus maintain the rate of change of flux in the core at zero. A second feed-back loop detects the second harmonic content of the output signal from the core, and feeds a signal back to the amplifier to balance out flux caused by very low frequency or direct current input signals. The modulator preferably uses a spiral tape magnetic core whose ends are connected together to form a short-circuited secondary winding for an energizing transformer. The end connection preferable passes through the core laminations so as to avoid unbalancing the device.
    • 谐波调制器,优选单核二次谐波调制器,被制成变压器,其能够通过使用芯上的两个输出绕组,“驱动”绕组和“感测”绕组来转换交流和直流电流。 高增益放大器连接到驱动器并且在第一反馈回路中感测绕组,以便将零感测绕组上的电压快速平衡并保持在零,并且因此将磁芯中的磁通变化率保持为零。 第二反馈回路检测来自核心的输出信号的二次谐波含量,并将信号反馈给放大器以平衡由极低频或直流输入信号引起的通量。 调制器优选使用螺旋带磁芯,其端部连接在一起以形成用于通电变压器的短路次级绕组。 端部连接优选通过芯层叠,以避免装置不平衡。