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A control method and device for a high-precision transformer constant-current sweeping power supply

A technology of sweep frequency power supply and control method, which is applied in the direction of output power conversion device, electrical components, etc., can solve the problems of low frequency accuracy, easy oscillation, slow dynamic response, etc., and achieves high frequency accuracy and improved stability. Effect

Active Publication Date: 2018-11-13
HEFEI KEWELL POWER SYST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional high-power inverters usually use IGBT as the switching device, the switching frequency is low, and the quality of the output waveform cannot be guaranteed in a wide frequency range, so the general frequency conversion range is narrow
For frequency converters with a wide frequency range, frequency hopping is usually used, but a large sine table needs to be established, and the frequency accuracy is not high, so continuous frequency changes cannot be achieved
In addition, the traditional constant current inverter power supply usually adopts current single closed-loop control, the system stability is poor, the dynamic response is slow, and oscillation is easy to occur

Method used

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  • A control method and device for a high-precision transformer constant-current sweeping power supply
  • A control method and device for a high-precision transformer constant-current sweeping power supply
  • A control method and device for a high-precision transformer constant-current sweeping power supply

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Embodiment 1

[0054] Now take the constant current frequency sweep for transformer testing as an example, the inverter outputs 0~15A, 45~400Hz variable frequency current, the specific control method is as follows:

[0055] (1) Assuming that the current output current command frequency is 80Hz, the method for generating the command current reference frequency is as follows:

[0056] 1a. Load a sine table with 200 points in the DSP control circuit, that is, the fixed carrier ratio is N=200;

[0057] 1b. When the instruction frequency is 80Hz, the carrier frequency is 16kHz;

[0058] 1c. Use the continuous increase and decrease mode to obtain the carrier interruption period value T pr =150M / 16k / 2=4688, thus obtaining the reference frequency f of the command current ref = 80Hz.

[0059] (2) Assuming that the current output current command size is 10A, the closed-loop control method described is:

[0060] 2a. Measure the output current and the output voltage of the variable frequency power s...

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Abstract

The invention relates to a control method for a high-precision transformer constant-current frequency-sweeping power supply. The closed-loop control generates a modulation wave; the obtained modulation wave is sent to the FPGA / CPLD pulse modulation circuit for real-time comparison with the triangular carrier wave, thereby generating a switching tube drive pulse; judging whether the current current reaches the command value, thereby generating a new frequency command. The invention also discloses a control device for a high-precision transformer constant-current frequency-sweeping power supply. In the present invention, the output frequency of the frequency converter can be continuously adjusted, and the frequency accuracy is very high; the control of the output current is converted into the control of the output voltage, which improves the stability of the entire control system; the asynchronous modulation is adopted to realize the fixed switching frequency of the driving pulse ; Ensure that the output current has reached the command value by continuously judging the effective value of the output current.

Description

technical field [0001] The invention relates to the technical field of power electronics and magnetic element testing, in particular to a control method and device for a high-precision transformer constant-current frequency-sweeping power supply. Background technique [0002] The transformer is an important equipment in the power transmission and distribution link of the power grid. When using the mechanical vibration frequency response method to diagnose the fault of the transformer winding, a stable variable frequency constant current source is required. The design idea of ​​the variable frequency constant current source is to control the inverter after PWM modulation Output frequency and output voltage, and use negative feedback to make the load current track the given current to achieve constant current frequency sweep. Constant current sweeping power supply is mainly used for testing magnetic components such as transformers, so frequency conversion power supply is requi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08
CPCH02M1/08H02M1/0012
Inventor 唐德平
Owner HEFEI KEWELL POWER SYST CO LTD
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