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Current measuring method

A technology for measuring current and current, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., to achieve the effect of low cost, easy implementation, and wide range of measuring current

Inactive Publication Date: 2004-11-03
DALIAN UNIV OF TECH
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Problems solved by technology

[0009] Only one current transformer CT and related circuits are used to simultaneously obtain the pulse voltage signal with a one-to-one correspondence between the working power supply of the measuring device itself and the duty cycle and the measured current, and the current is realized by measuring the duty cycle of the pulse voltage signal. The method of measurement has not yet been reported

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Embodiment Construction

[0024] Below in conjunction with the accompanying drawings, the specific implementation and best embodiments of the present invention will be described in detail.

[0025] as attached figure 1 As shown, the working principle of the current measurement is: the current in the current-carrying wire 9 (that is, the measured current) passes through the current transformer CT1, the shunt regulator 2, the rectifier filter 3 and the voltage stabilizer 4, and then outputs a stable voltage , to supply power to relevant circuits; when the current in the current-carrying wire 9 changes, the input voltage of the voltage regulator 4 will also change, and this voltage is sampled by the sampling circuit 6, and the hysteresis comparator 7 detects the signal from the sampling circuit 6 , output a pulse voltage, the pulse voltage is controlled by the drive circuit 8 to turn on and off the shunt regulator 2, so as to ensure that the input voltage of the voltage regulator 4 remains within an appro...

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Abstract

The present invention belongs to the field of electronic measurement technology, and is especially one new kind of current measuring method. Without need of outer work power supply, one current transformer CT, current / voltage converting circuit and other circuit are used to obtain the work power supply for the measurement device and relative measured current signal. The present invention features that only one current transformer CT, one current / voltage converting circuit comprising shunt regulator, rectifying filter, sampling circuit, delayed comparator, driver circuit and voltage stabilizer, and one signal processing and displaying unit are used to obtain the work power supply for the measurement device and one pulse voltage signal with duty ratio corresponding to the measured current for current measurement via the duty ratio measurement. The present invention has wide measurement range, and is especially suitable for where no work power supply is provided.

Description

technical field [0001] The invention belongs to the technical field of electronic measurement and relates to a new method for measuring current. This method is especially suitable for use in occasions where it is difficult to provide external working power. Background technique [0002] Current is one of the most fundamental physical quantities. At present, there are many known methods for measuring current, such as: [0003] 1. Use electromagnetic or magnetoelectric pointer ammeter, which is based on the principle of electromagnetic action and the condition of the balance between electromagnetic torque and mechanical torque to realize current measurement; [0004] 2. Using the Hall current sensor, it is based on the relationship between the magnitude of the Hall potential and the current in the current-carrying conductor to achieve current measurement; [0005] 3. Using the voltage drop generated when the current passes through the resistance, it is based on the law of O...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01R19/25
Inventor 戚栋王宁会吴彦夏元化
Owner DALIAN UNIV OF TECH
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