High-voltage frequency converter with over-voltage protection function and over-voltage protection method of frequency converter
A high-voltage inverter, protection function technology, applied in the output power conversion device, the conversion of AC power input to AC power output, electrical components and other directions, can solve problems such as production accidents, damage to the inverter and external equipment, to avoid The effect of production accidents
Inactive Publication Date: 2013-04-17
JIANGSU LIPU ELECTRONICS & TECH
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Problems solved by technology
When an overvoltage fault occurs in a high-voltage inverter, if it cannot be found and dealt with immediately, the inverter and external equipment will be damaged, and production accidents will occur
Method used
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Embodiment 1
[0031] Embodiment one: figure 1 As shown, a high-voltage frequency converter with overvoltage protection function has a line voltage of 6kV and uses a 1700V IGBT, including a power cabinet 1. There are 15 power units in the power cabinet 1, and each phase contains 5 power unit.
[0032] The high-voltage frequency converter also includes:
[0033] An incoming line voltage signal acquisition module that collects and outputs the input voltage signal of the high-voltage frequency converter located at the power inlet of the high-voltage frequency converter;
[0034] A power unit voltage signal acquisition module that is located at the power unit A1 of phase A of the high-voltage frequency converter and collects and outputs the output voltage signal of the power unit A1;
[0035] Receive the input voltage signal of the high-voltage frequency converter and the output voltage signal of the power unit, and convert the input voltage signal of the high-voltage frequency converter and t...
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The invention discloses a high-voltage frequency converter with an over-voltage protection function, and an over-voltage protection method of the frequency converter. The high-voltage frequency converter comprises an incoming line voltage signal acquisition module, a power unit voltage signal acquisition module, an analog / digital conversion module, a signal comparison module and a master control module, wherein the analog / digital conversion module receives a voltage signal and converts the voltage signal to a digital signal for output; the signal comparison module receives the digital signal, compares the digital signal with a reference voltage signal, and outputs an over-voltage signal; and the master control module receives the over-voltage signal, and controls power frequency output of the high-voltage frequency converter. According to the invention, the incoming line voltage signal acquisition module and the power unit voltage signal acquisition module can automatically detect an over-voltage fault of the frequency converter, and when the over-voltage fault occurs, the master control module switches the output of the high-voltage frequency converter to power frequency output, and an alarm signal is emitted simultaneously, so that the frequency converter and external devices are automatically protected, and production accidents are avoided.
Description
technical field [0001] The invention relates to a high-voltage frequency converter, in particular to a high-voltage frequency converter with an overvoltage protection function and an overvoltage protection method thereof. Background technique [0002] The technology of realizing AC control by changing the AC frequency is called frequency conversion technology. Its core is the frequency converter, which realizes the automatic adjustment of the motor operating speed by converting the power supply frequency, and changes the fixed grid frequency of 50Hz to a variable frequency. At the same time, the power supply voltage is adjusted to a certain adaptable range. [0003] Because of its ability to realize stepless speed regulation and transform the traditional motor into an intelligent motor, the high-voltage frequency converter has significant energy-saving benefits, can control the starting current within the rated current, has no impact current, has little impact on the power g...
Claims
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Login to View More IPC IPC(8): H02M5/00H02M1/32
Inventor 余芙容姚大胜余维成
Owner JIANGSU LIPU ELECTRONICS & TECH