Method related to pulse current pulse width comparison
A technology of pulse current and pulse voltage, which is applied in the field of short-circuit protection of motor insulation corona resistance test, can solve the problems of unfavorable protection device personal safety, short-circuit protection scheme cannot be applied to modular equipment, and long protection time of protection measures, etc., to achieve protection The effect of personal safety
Inactive Publication Date: 2020-07-17
SICHUAN UNIV
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Problems solved by technology
[0005] At present, there are few reports on the short-circuit protection measures for the corona resistance test of pulse power supplies at home and abroad, and most of them focus on the short-circuit protection of power electronic devices. The existing short-circuit protection schemes cannot be applied to modular equipment with complete packaging of power electronic devices, and It takes a long time to implement protection measures after a short circuit, which is not conducive to the protection of devices and personal safety
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[0028] Such as figure 1 As shown, a method for comparing the pulse width of pulse current, including installing a current sensor at the output end of the pulse power supply to collect the pulse current signal flowing through the sample, reducing the current signal by a ratio of 1000:1 and then transmitting it to the core through the signal line Control board; after the current signal reaches the core control board, the pulse current signal is converted into a pulse voltage signal through the voltage-taking resistor, and then it is followed by the same phase, amplified and reversed by the operational amplifier circuit, and the representative positive polarity and negative polarity are obtained. Two pulse voltage signals representing positive and negative polarity are respectively processed by a voltage comparator with corresponding comparison values, and two high and low level signals are obtained, which are input into the FPGA for logic judgment processing. By counting the pul...
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The invention discloses a method related to pulse current pulse width comparison. The method comprises the steps of acquiring a pulse current signal on a wire between the output end of a pulse power supply and a test sample, scaling down and feeding back to a control panel; matching the reduced pulse current signal with a voltage tapping resistor, and converting the pulse current signal into a pulse voltage signal; carrying out following and amplifying on the pulse voltage signal by an operational amplifier circuit on the control panel; comparing the voltage signals processed by the operational amplifier circuit by a voltage comparator, and then outputting high level or low level representing positive and negative polarities respectively; enabling the output high level or low level to convert the voltage pulse signal with amplitude nonlinear change into a linear square wave signal and input the linear square wave signal into an IO port of the FPGA; and enabling the FPGA to judge the pulse width change of the square wave signal before and after short circuit according to the input square wave signal and determine whether to start short circuit protection or not. By means of the scheme, the purposes of system and personnel safety are achieved, and high practical value and promotional value are achieved.
Description
technical field [0001] The invention belongs to the technical field of short-circuit protection for motor insulation and corona resistance testing, and in particular relates to a method for comparing pulse widths of pulse currents. Background technique [0002] With the development of power electronics technology, variable frequency motors are widely used in wind power generation, high-speed railways, new energy vehicles and ship drives. However, the variable frequency motor works under the pulse width modulation (PWM) voltage, and the insulation of the variable frequency motor bears the impact of the high-frequency repetitive pulse square wave with the same breaking frequency as the PWM. Due to the impedance mismatch at the end of the stator, it is easy to generate overvoltage , so as to withstand more severe electrical stress. When the electrical stress exceeds the partial discharge initiation voltage (PDIV), partial discharge is prone to occur, thereby accelerating the ag...
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IPC IPC(8): G01R29/027G01R31/52G01R31/56G01R31/12G01R31/34H02H3/08
CPCG01R29/0273G01R31/1227G01R31/34H02H3/08
Inventor 王鹏陈君强顾洋豪董涵
Owner SICHUAN UNIV