Dual frequency conversion control system

Abstract

The invention relates to a dual frequency conversion control system. The system comprises a first motor control module, a second motor control module and a micro-programmed control unit (MCU) master control module, wherein the first motor control module is used for controlling a working state of a first motor for performing 180-degree direct current frequency conversion control; the second motor control module is used for controlling a working state of a second motor for performing 180-degree direct current frequency conversion control; the MCU master control module generates a first group ofpulse width modulation (PWM) control signals and a second groups of PWM control signals, controls the first motor control module according to the first group of PWM control signals and controls the second motor control module according to the second group of PWM control signals; and the first group of PWM control signals and the second group of PWM control signals comprise 6 paths of PWM signals respectively. In a power system in which two motors are required to be simultaneously applied, one MCU master control module is adopted to simultaneously control the two motors for performing 180-degree direct current frequency conversion control; and the system has the advantages of low power consumption, lower noise, higher running stability of the motors and lower cost.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control, and more specifically relates to a double frequency conversion control system. Background technique [0002] In the power system of medium and large power motors, AC motors and DC motors are commonly used, and DC motors are further divided into brushless DC motors and brushed DC motors. For example, in the air conditioning control system, two motors need to be controlled, one is the compressor and the other is the outdoor fan. The traditional control method is to use two sets of control systems to control the compressor and the outdoor fan respectively. However, the output of these two motors The control methods used are different, some use AC motors, some use 120-degree DC frequency conversion control, but each has its own shortcomings, such as the power consumption of AC motors is generally large, and the power consumption of 120-degree DC frequency conversion drives brushl...

AI Technical Summary

Problems solved by technology

For example, in the air conditioning control system, two motors need to be controlled, one is the compressor and the other is the outdoor fan. The traditional control method is to use two sets of control systems to control the compressor and the outdoor fan respectively. However, the output of these two motors The control methods used are different, some use AC motors, some use 120-degree DC frequency conversion control, but each has its own shortcomings, such as the power consumption of AC motors is generally large, and the power consumption of 120-degree DC frequency conversion drives brushless motors. The utilization rate is low, the noise is large, and the stability of the motor operation is low. It can be seen that there are certain constraints in the specific implementation.

[0003] Therefore, in the power system that needs to use two motors at the same time, such as the above-mentioned control systems of air conditioners, refrigerators and washing machines, if the above-mentioned AC motor or 120-degree DC variable frequency drive brushless motor is used, and two sets of control systems are used to control these respectively When there are two motors, the power consumption is large, the power utilization rate is low, the noise is large, the stability of the motor operation is low, and the cost is high

Images