How does the pure sine wave inverter's overload protection work

The overload protection mechanism of the Pure Sine Wave Inverter is a key component to ensure its safe and stable operation. It is designed to avoid damage to the inverter and its connected electrical equipment or more serious electrical failures when the load is too large. This mechanism monitors the current changes in the electrical system in real time and responds quickly to abnormal conditions to achieve effective protection for the inverter and its related equipment.

The core of the overload protection mechanism lies in current detection and signal processing. The Pure Sine Wave Inverter is equipped with a high-precision current transformer (CT) that can collect current signals in the electrical system in real time. These current signals are converted to generate proportional voltage signals for subsequent processing and analysis.

The converted voltage signals are transmitted to the microprocessor of the inverter. As the control core of the overload protection mechanism, the microprocessor continuously collects, calculates and stores these signals and compares them with the preset current setting value. The current setting value is set according to the rated power of the inverter and the load characteristics of the connected equipment, representing the maximum safe current that the inverter can withstand.

Once the actual current exceeds the current setting value and lasts for the preset overcurrent time, the microprocessor will issue a trip command to trigger the action mechanism inside the inverter, usually an electromagnetic relay or a solid-state relay. This mechanism can quickly cut off the circuit and disconnect the power supply, thereby effectively protecting the inverter and its connected electrical equipment from further damage. This process is usually automatic and does not require human intervention, ensuring fast response and efficient protection.

The overload protection mechanism of the pure sine wave inverter also has a variety of protection features to further enhance its comprehensive protection capabilities. Among them, time-limited protection is an important protection method. When the load current exceeds the set current setting value and lasts for the set overcurrent time, the inverter will automatically trip and cut off the circuit. This protection method is particularly suitable for application scenarios that require precise control of overcurrent time, such as precision equipment in industrial automation systems.

Inverse time protection is another key protection feature. The principle is that the greater the ratio of load current to current setting value, the shorter the trip time. This protection method can respond more quickly to severe overload conditions, thereby reducing the risk of equipment damage. When the ratio of the load current to the current setting value exceeds a certain set value (called the instantaneous multiple), the inverter will regard this situation as a short circuit. In this case, the inverter will quickly cut off the circuit in a very short time (usually within 0.5 seconds) to prevent the short-circuit current from damaging the equipment.