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Special power supply for AC loss test for superconducting magnet

An AC loss, superconducting magnet technology, applied in the direction of AC power input conversion to AC power output, electrical components, adjustment of electrical variables, etc., can solve the problems of inability to guarantee current, complex structure, high price, etc. The effect of high road gain and low production cost

Inactive Publication Date: 2007-11-14
NANJING UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

One method mostly uses voltage feedback. The main disadvantage is that it cannot guarantee that the current will remain constant under the condition of load changes, so as to maintain a very small AC waveform distortion.
The other adopts inverter technology, which is complex in structure and expensive

Method used

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  • Special power supply for AC loss test for superconducting magnet

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Embodiment Construction

[0016] The power supply is mainly composed of two parts: an operational amplifier and a differential amplifier circuit, a constant current source circuit and a power output. The power amplifying circuit mainly uses a dual power supply complementary symmetrical circuit (OCL Class A and B push-pull amplifier circuit) as the output of the power supply.

[0017] 1. Constant current source circuit

[0018] In the figure, B1 is an AC signal source, B3 operational amplifier constitutes a constant current source for series current negative feedback, and B16 is a feedback resistor. B10 and B11 are amplifying circuits that provide driving current for the post-stage power amplifier. B11, B12, B13 also eliminate crossover distortion of AC amplification as bias circuits.

[0019] 2. Power amplifier circuit

[0020] The power output tubes of push-pull amplification use a pair of triodes to form a composite tube: one pair of triodes B17 and B18 form a composite tube A1, and the other pair...

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Abstract

The power supply is composed of operational amplification circuit (OAC) and power amplification circuit (PAC). The output end of OAC is connected to PAC. Output from complementary symmetry circuit of dual power supplies is adopted in PAC, which uses diode as bias circuit. Being connected to feedback resistance, the push pull amplification circuit is connected to the input end of OAC. Features are: high loop gain, small waveform distortion, capable of carrying out linear power amplification with high fidelity for inputted AC signal. Using AC inverse feedback to guarantee independence between outputted current and load, the invention is especially suitable to power supply with high requirement of waveform.

Description

technical field [0001] The invention relates to a special AC power supply for testing the AC loss of superconducting magnets, which is especially suitable for occasions with high requirements for large current and output waveform. Background technique [0002] In the past ten years, high-temperature superconducting materials have been widely used in high-temperature superconducting cables, transformers, high-current leads and superconducting magnets. One of the key factors affecting the application of high temperature superconducting materials is its AC loss. High-temperature superconducting materials will generate AC loss through AC power and in an alternating magnetic field. If the heat cannot be dissipated in time, the temperature of the conductor will rise and the critical current will drop, which will obviously affect the safe operation of the superconducting device. Therefore, measuring the AC loss of high temperature superconducting materials has important practical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/293G05F1/12
Inventor 纪圣谋丁世英徐健健
Owner NANJING UNIV
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