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Double detection type current sensor

A current sensor and dual detection technology, applied in the direction of measuring current/voltage, measuring electrical variables, instruments, etc., can solve problems such as influence and failure to meet special waveform current detection requirements, achieve frequency bandwidth, improve anti-interference performance, and suppress temperature effect of error

Inactive Publication Date: 2006-08-02
HUAZHONG UNIV OF SCI & TECH
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AI Technical Summary

Problems solved by technology

For the transient current whose amplitude is not too large, if a shunt is connected in series in the power electronic circuit, the electrical parameters of the circuit will be changed, which will have an impact on the measured current loop; if a comparator, current transformer, Rogowski Conventional sensing devices such as coils and Hall elements can no longer meet the detection requirements of the above-mentioned special waveform current

Method used

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Embodiment Construction

[0030] Depend on figure 1 As shown, 1 is a display, 2 is a computer for processing detection voltage signals from two groups of parallel channels; 3 is a filter, voltage-current conversion, and current amplification circuit for processing Hall voltages from two symmetrically arranged Hall detection elements; 4 is the filtering and integral amplifier circuit for processing the induced voltage from the Rogowski coil connected in series; 5 is the measured current bus; 6 is the dedicated ground layer; F 1 , F 2 and F 3 For three skeleton cores; A 1 and A 2 is the operational amplifier; R S1 and R S2 is the sampling resistance of two groups of detection channels; I F1 and I F2 is the current flowing in the two groups of detection channels; U S1 is the sampling resistor R S1 terminal voltage; U S2 is the output voltage of circuit 4; U R1 and U R2 is the sampling resistor R S2 The terminal voltage, H 1 and H 2 are two Hall elements; U H1 and U H2 Hall voltage output ...

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Abstract

This invention discloses a double-detecting current sensors, wherein there evenly and symmetrically located gas gaps in the circular iron core and feedback windings in two paralleling channels are cascaded one end of which is put to earth and the other is connected with one end of corresponding sample resistance; the output of two Hall components located symmetrically are to filter wave, to translate voltage and current and to enlarge current after kinematical gaining. And their outputs are connected with the other end of sample resistance. The voltage signals of both ends of said resistance are delivered into computer. And the both ends of cascaded Rogowski coil are connected with sample resistance and it signals can split wave, enlarge volume after kinematical gaining and its voltage signals are delivered to computer and displayed on the screen. The invention can overcome the shortcomings caused by iron core saturation and is of high accuracy and high anti-interference of magnetism and of simple structure.

Description

technical field [0001] The present invention relates to a current sensor, which is suitable for detecting DC and AC currents including: current feedback, cut-off control, steady current regulation, and transient current signal detection in DC side overcurrent and short circuit protection in power electronic equipment . Background technique [0002] Accurately detect and control non-sinusoidal current in DC transmission system, frequency conversion speed control device, UPS power supply, inverter welding machine, electrolytic plating, numerical control machine tool, microcomputer monitoring system, power grid monitoring system and various fields that need to isolate and detect non-sinusoidal current , is the fundamental guarantee for the safe and reliable operation of the equipment and the first problem to be solved. [0003] Rogowski coil, its magnetic circuit does not contain iron core, is a special structure of air-core coil, also known as air-core transformer. Because i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 李维波毛承雄陆继明
Owner HUAZHONG UNIV OF SCI & TECH
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