Method 1: Pulse Power or Overcurrent Limitation
In the development of aviation power supplies for new products, current limiting is essential due to the superpower output from a single pulse. This single-pulse superpower or current limiting method is highly effective in practical applications for overload protection and additional secondary-side current limiting. This technology is commonly used. In previous switches, input current is monitored in real-time. If the current exceeds a predetermined limit, the pulse is terminated. In flyback converters, high current determines the circuit's power. This type of protection circuit becomes a true power limiting protection circuit.
Method Two: Overload Power Off Delay Shutdown Protection
The ultra-power delay shutdown protection technology, as a highly effective overload protection technique, has been widely applied in domestic aviation power supply products. In the delay-tripping systems, power shutdown is only initiated when the current stress exceeds a safe threshold for a prolonged period. Short-term transient currents do not compromise the reliability of the power supply nor significantly impact its cost. Only long-term current demands affect the cost and size of the circuit. Aviation ground power, 2; 36V aviation power, 1; 400HZ variable frequency power, 7; 115/200V power, 2; 27V DC power, 5; 400HZ power, 12; aviation power supply.
Method Three: Reverse IP Protection
In addition to the aforementioned two methods, the flyback super-protection, which limits power, is also a crucial measure for ensuring the safe operation of aviation power sources. This technology, an extension in speed, is widely used in the research and manufacturing of aviation power sources in China. The adapter circuit, circuit, utilizes this protective method to monitor voltages on both the primary and secondary sides. When the output voltage drops, the power is reduced. Through this method, output current is decreased when the load resistance is low, thereby preventing excessive stress damage to the secondary components.
Method Four: Constant Power Limit Protection
A constant input power limitation protection method is one of the four aviation power supply protection technologies we will introduce today. It is a widely used output protection technology both domestically and internationally. Currently in development are the aviation 28V power supplies and 270V aviation DC power supplies, as well as ±135V DC aviation power supplies, which are all widely applied. The protection principle of this method is to protect the primary side circuit by limiting high output power. However, in a flyback converter, this technology is challenging to protect the side output. For instance, in a discontinuous flyback converter, the original edge peak current is limited, which is the limit of transmission power.
