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Stepless-adjustment pure resistive alternating current load

An AC load, stepless adjustment technology, applied in the improvement of basic electrical components, etc., can solve the problem of not being able to achieve continuous adjustment, achieve the effect of simple and practical method, reduce the size of resistance devices, and avoid contact problems

Inactive Publication Date: 2018-07-24
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, pure resistance devices and switching circuits can be used to realize AC variable pure resistance loads, but continuous adjustment cannot be achieved.

Method used

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  • Stepless-adjustment pure resistive alternating current load

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Embodiment Construction

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below, obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0019] Such as figure 1 As shown, a steplessly adjustable pure resistive AC load includes: bridge rectifier D, multiplier IC, Zener diode DW, capacitor C, high-power tube BG, first resistor R1, second resistor R2, third The resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the seventh resistor R7, the third resistor R3 and the fourth resistor R4 are adjustable resistors. The input of the bridge rectifier D is connected to the secondary voltage output of the voltage transformer CVT,...

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Abstract

The invention relates to a stepless-adjustment pure resistive alternating current load. The load comprises a voltage transformer, a bridge rectifier, a multiplier, a voltage stabilizing diode, a capacitor, a high power tube, a first resistor, a second resistor, a third resistor and a fourth resistor. The input end of the bridge rectifier is connected to the secondary voltage output end of the voltage transformer. One end of bridge rectifier output is connected to one end of the first resistor, one end of the second resistor and the drain electrode of the high power tube. The other end of the first resistor is connected to one end of the capacitor, one end of the third resistor and the cathode of the voltage stabilizing diode. The sliding point of the third resistor is connected to the input end y of the multiplier. The other end of the second resistor is connected to one end of the fourth resistor. The sliding point of the fourth resistor is connected to the input end x of the multiplier. The output end Z of the multiplier is connected to the grid electrode of the high power tube. Compared with the prior art, by using the load of the invention, a circuit is simple and practical andreliability is high.

Description

technical field [0001] The invention relates to the field of voltage transformer precision, in particular to a stepless adjustment pure resistive AC load. Background technique [0002] In the process of realizing high-precision voltage transformer measurement, there is a close relationship between the voltage accuracy delivered by the voltage transformer and the load of the voltage transformer. In the current voltage transformer application, generally by ensuring the voltage accuracy within a reasonable range within a reasonable load range, due to the uncertainty of the load, although the work within the accuracy range can be achieved, the dispersion within the accuracy range is also objective existing. Even in the case of light load, the voltage accuracy is out of tolerance because the working load exceeds the reasonable load range; especially at present, the digital energy meter is widely used, and its working load is much smaller than one-tenth of the traditional inducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R1/20
CPCG01R1/20
Inventor 叶铮罗彦鸣赵树龙戴春怡
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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