Due to the crucial role inverters play in converting DC to AC in circuits, their safety is of paramount importance. In the event of a short circuit in the inverter power supply, there is a risk of burning. To effectively prevent short circuits, it is essential to pay close attention to the overcurrent and short-circuit protection circuit within the inverter power supply. This article will introduce the design of overcurrent and short-circuit protection circuits.
In real-life scenarios, most loads are impulse loads, such as incandescent bulbs, which have a lower resistance in their cold state compared to when they are lit. Rectifier loads like computers and televisions, due to the need for a larger capacitor to filter the rectified AC input, experience a higher impulse current. Additionally, motor inductive loads such as refrigerators require a significant amount of power to produce a large torque from stationary to normal operation, resulting in a higher starting current. Aerial Ground Power: 2, 36V Aerial Power: 1, 400Hz Variable Frequency Power: 7, 115/200V Power: 2, 27V DC Power: 5, 400Hz Power: 12, Aerial Power
If our inverters are only capable of being set to a single rated output power that can operate continuously, loads with starting power exceeding this rated output power cannot be powered up. This necessitates matching the inverter to the starting power, which is clearly inefficient. In practice, when designing overcurrent and short-circuit protection circuits, we design two protection points: rated power and peak power. Generally, the peak power is set at 2-3 times the rated power. The rated power is not protected for long-term operation, while the peak power typically provides protection for only a few seconds.
