Variable-frequency speed control input voltage conversion device and method thereof

Abstract

A variable-frequency speed control input voltage conversion device belongs to the field of converters. Existing input conversion devices can not give attention to production technique, cost, conversion precision and the like simultaneously, and the device of the invention comprises a voltage conversion module and an information processing module. The device is characterized in that the voltage conversion module comprises an industrial frequency transformer which can be electrically connected with commercial power and a voltage division circuit for dividing voltage, the information processing module comprises an A / D conversion unit which is connected with the voltage conversion module, a storage unit for storing transformation coefficients of the industrial frequency transformer and the voltage division coefficients of the voltage division circuit, and a computing unit for calculating input voltage values according to the transformation coefficients, the voltage division coefficients and digital signals output by the A / D conversion unit, and the voltage division circuit comprises a first voltage division resistance and a second voltage division resistance. The insulation between strong electricity of commercial power and weak electricity of a central processing unit is realized on a circuit structure, the cost is low, the reliability is high, the production technique is simple,and the precision is high.

Description

【Technical field】 [0001] The invention relates to a construction tool, specifically a frequency conversion speed regulation input voltage conversion device and a method thereof, which belong to the field of frequency converters. 【Background technique】 [0002] The high-frequency vibration motor requires 380V / 200HZ three-phase power supply, which can be rectified and filtered through 380V / 50HZ three-phase mains input, and then converted into 380V / 200HZ three-phase power supply through power devices. Since the mains power is fluctuating, if it is directly inverted without conversion, the voltage of the inverter power supply will also fluctuate correspondingly, which does not match the voltage required by the motor. Therefore, it is necessary to collect the change value of the mains voltage for adjustment and control The output voltage of the inverter makes the inverter work more stable. There are two main ways to collect mains voltage. One is to use simple resistor voltage di...

AI Technical Summary

Problems solved by technology

The input voltage comes from the municipal power grid, and through the secondary coil of the power frequency transformer, the isolation between the strong power of the mains and the weak power of the information processing module is realized, ensuring the safety of the conversion circuit. At the same time, the cost of the power frequency transformer is higher than that of the high frequency transformer. Low; the storage unit built into the information processing module saves two coefficients, which are the proportional relationship between the secondary coil and the primary coil of the power frequency transformer K1 and the voltage division coefficient K2 in the voltage dividing circuit, and the conversion of the input voltage of the frequency conversion speed regulation of the high-frequency vibration motor During the production process of the device, the K1 and K2 values ​​can be obtained by using the detection equipment, and the values ​​are sent to the information processing module for storage. Due to the two coefficients, it can solve the discreteness of the proportional relationship between the secondary coil and the primary coil of the power frequency transformer. Problems and the low precision of the voltage dividing resistors in the voltage dividing circuit, the voltage dividing resistors only need ordinary resistors, no precision resistors or adjustable resistors, avoiding the complexity of production due to manual adjustment of adjustable resistors, and avoiding the need for adjustable resistors. Value temperature drift problem

Images