AC dynamic detection device, AC dynamic detection method, insurance device and current display device

Abstract

The invention discloses an AC dynamic detection device, an AC dynamic detection method, an insurance device and a current display device. The AC dynamic detection device comprises a first DC power supply circuit, a second DC power supply circuit, a voltage-stabilizing reference circuit, a micro potential sampling circuit, a power-frequency AC amplifying circuit, a wave detection circuit, a calibration circuit, a signal display and an electromagnetic conversion COS phi amplification sampling and measurement circuit. The voltage output end of the first DC power supply circuit is connected with the power input end of the power-frequency AC amplifying circuit. The voltage output end of the second DC power supply circuit is connected with the power input end of the signal display. The voltage input end of the voltage-stabilizing reference circuit is connected with the second DC power supply circuit. The voltage output end of the voltage-stabilizing reference circuit is connected with the reference voltage input end of the signal display. The sampling voltage signal output end of the micro potential sampling circuit is connected with the input end of the power-frequency AC amplifying circuit. The output end of the power-frequency AC amplifying circuit is connected with the input end of the signal display sequentially through the wave detection circuit and the calibration circuit. The advantages of large measurement range, high sensitivity, direct and convenient measurement and the like are realized.

Description

technical field [0001] The invention relates to an alternating current detection device, in particular to an alternating current dynamic detection device and method, a safety device and a current display device. Background technique [0002] The measurement of alternating current is a very important measurement object in the measurement of electricity. The traditional methods of measuring alternating current are as follows: series resistance voltage division method with multimeter, electromagnetic conversion method using transformer, phase transformer detection, and The electro-magnetic-measuring method of the lying wheel watt-hour meter. Among them, the resistance voltage dividing method of multimeter and special meter has the highest resolution (taking four and a half digits as an example) of 100 microvolts, while the traditional method of measuring resistance is 200Ω. [0003] Above method all has comparatively mature product in various instruments and industry, househol...

AI Technical Summary

Problems solved by technology

For more scientific, long-term energy saving, continuous online measurement, especially large-scale, large-scale distributed monitoring, the above methods all have these inevitable defects: small measurement range, low sensitivity, unscientific, large body, weight , consumables, energy consumption, and high cost

Because whether it is an external voltage-dividing resistor with high-resistance voltage division or an electromagnetic conversion device, an auxiliary energy-consuming component is necessarily required for sampling in order to measure the AC current. In this way, it will inevitably result in continuous measurement range Small, low sensitivity, weight, large body, consumables, energy consumption, high cost; on the other hand, the loss of resources is also obvious, such as silicon steel sheets, insulating materials, copper materials, etc. required by electromagnetic converters

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