| 摘要 |
An electronic current transformer (ECT) based on complete self-excitation power supply is provided. The ECT includes an energy-obtaining coil, a rapid voltage-stabilizing circuit and an Analog/Digital (A/D) converting circuit. The output of energy-obtaining coil is connected with the input of the voltage-stabilizing circuit. The output of voltage-stabilizing circuit is connected with the control end of the A/D converting circuit. The ECT uses two branch circuits to obtain energy directly from bus bar magnetic field to be measured respectively, synthesizes two waveshapes output to fill in the trough of wave each other, and reduces pulse of direct current. In this way, the trough voltage of the synthesized waves is higher than the required stable value of direct voltage and directly meets the input requirement of stabilizing module of voltage-stabilizing circuit. As a result, the ECT can activate the A/D converting circuit rapidly. The present invention has solved the delay problem caused by using single coil to obtain energy, and has characteristics of small wake-up current, rapid activation and wide application. The ECT can omit additional laser power supply device, simplify the architecture, improve the reliability of operation and service life, and reduce the cost.
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