The control system of pure sine wave inverter

The control system of a pure sine wave inverter is one of its core components. It uses sophisticated circuits and algorithms to ensure that the inverter can stably and efficiently convert DC power into pure sine wave AC power.

Microcontroller or Digital Signal Processor (DSP)

Pure sine wave inverters are usually equipped with a microcontroller or digital signal processor that executes the control algorithm and manages the various functions of the inverter. These processors have a high degree of computing power and programmability, allowing them to adapt to different operating conditions and load requirements.

control algorithm

The core of the control system is the control algorithm, whose goal is to monitor the input DC power supply and output AC load, and dynamically adjust the working status of the switching device to maintain the required output waveform. Common control algorithms include proportional integral derivative (PID) control and advanced model predictive control (MPC). These algorithms work in conjunction with the inverter's sensors to adjust the output waveform in real time to meet load demand.

PWM modulation technology

Pulse width modulation (PWM) technology is a key part of the control achieved in pure sine wave inverters. The control system uses PWM technology to generate high-frequency pulse signals by adjusting the on-time of the switching device. The average value of these signals constitutes the output waveform of the inverter. The control system adjusts the parameters of the PWM as needed to achieve the desired output frequency and amplitude.

Output current and voltage monitoring

In order to ensure that the current and voltage output by the inverter meet the set standards, the control system will be equipped with current and voltage sensors. These sensors provide necessary feedback information to the control system by monitoring changes in current and voltage in real time in order to adjust the parameters of the PWM and maintain the stability of the output.

Frequency and phase lock

For some applications, such as inverters connected to the power network, frequency and phase synchronization is crucial. The control system ensures that the frequency and phase of the inverter output are synchronized with the grid by using technologies such as phase-locked loop (PLL) to seamlessly connect the inverter to the grid.

Communication interfaces and smart functions

Modern pure sine wave inverters usually have communication interfaces, such as serial communication interfaces (RS485, Modbus) or wireless communication (Wi-Fi, Bluetooth), to enable integration and monitoring with other systems. In addition, some inverters are equipped with intelligent functions such as automatic load recognition, adaptive adjustment and remote monitoring to improve system operability and flexibility.

Fault detection and protection mechanism

The control system is also responsible for monitoring the operating status of the inverter and taking appropriate protective measures when a fault or abnormal situation occurs. Common protection mechanisms include overload protection, short circuit protection, over-temperature protection, etc. These mechanisms ensure that the inverter can operate safely under extreme conditions and prevent equipment damage.