A Digital DC Current Sensor
A DC current and sensor technology, applied in the direction of voltage/current isolation, measurement using digital measurement technology, instruments, etc., can solve the problems of low linearity of sensors, inability to adapt to high-precision measurement, expensive chips, etc., and the process is simple Effect
Active Publication Date: 2022-02-18
NAVAL UNIV OF ENG PLA
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Problems solved by technology
The digital current sensor based on the duty cycle model is a low-cost digital sensor that can measure the measured current by measuring the duty cycle of the oscillating voltage waveform, but this type of sensor has low linearity and cannot adapt to high-precision measurement. At present, the method of digital-to-analog conversion is used to realize zero magnetic flux compensation, but the high-digit digital-to-analog conversion chip is expensive, which will make this type of sensor lose its price advantage
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[0018] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings. It should be noted here that the descriptions of these embodiments are used to help understand the present invention, but are not intended to limit the present invention.
[0019] Such as figure 1 As shown, the present invention provides a digital DC current sensor, comprising a ring iron core 1, a square wave excitation circuit, a shaping circuit and a square wave measurement circuit, the square wave excitation circuit passes through the excitation circuit wound on the primary side of the ring iron core 1 The self-excited oscillation of the coil 2 generates a square wave, and the shaping circuit is used to shape the square wave generated by the square wave excitation circuit, and the square wave measurement circuit measures the period and pulse width of the shaped square wave, and the square wave The PWM signal output end of the measurement ...
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The invention discloses a digital direct current sensor. It includes a ring iron core, a square wave excitation circuit, a shaping circuit and a square wave measurement circuit. The square wave excitation circuit generates a square wave through the self-excited oscillation of the excitation coil wound on the primary side of the ring iron core. The shaping circuit is used for the other side The square wave generated by the wave excitation circuit is reshaped, and the square wave measurement circuit measures the period and pulse width of the reshaped square wave. The PWM signal output end of the square wave measurement circuit is connected with a current compensation circuit, and the current The compensation coil of the compensation circuit is wound on the secondary side of the annular iron core to form a closed loop. The PWM signal output port of the square wave measurement circuit of the present invention is directly connected to the current compensation circuit, and the compensation is realized by changing the duty cycle of the output high and low levels, so that the measurement iron core is in a state of zero magnetic flux, and the measurement accuracy of the sensor is improved while not Significantly increased costs.
Description
technical field [0001] The invention belongs to the technical field of current measurement, and in particular relates to a digital direct current sensor. Background technique [0002] More and more power systems use DC power supply, and the system needs to measure the DC current flowing through it. The digital current sensor based on the duty cycle model is a low-cost digital sensor that can measure the measured current by measuring the duty cycle of the oscillating voltage waveform, but this type of sensor has low linearity and cannot adapt to high-precision measurement. At present, digital-to-analog conversion is used to realize zero flux compensation, but the high-digit digital-to-analog conversion chip is expensive, which will make this type of sensor lose its price advantage. Contents of the invention [0003] The object of the present invention is to provide a digital DC current sensor with simple structure and low cost in order to solve the above-mentioned shortcom...
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IPC IPC(8): G01R15/18G01R19/25
CPCG01R15/185G01R19/25
Inventor 罗宁昭杨锋张挺张尧
Owner NAVAL UNIV OF ENG PLA