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Protection Switch Power Adapter Four Ways

Shenzhen GEO Technology Co.,Ltd | Updated: Sep 29, 2017

Protection switch power adapter four ways

Method One, pulse-by-pulse overcurrent or overcurrent limit

The overdrive or overcurrent limit for one-shot pulses is a very effective output overload protection method in practice, and is often used in additional secondary current limiting protection. In the previous switching equipment, power adapter the input current is to be monitored in real time. If this current exceeds the specified limit current value, the conduction pulse will be terminated. In the continuation of the flyback converter, its maximum current determines the power of the circuit, this type of protection circuit becomes a real power limit protection circuit.

Method 2, over-power delay shutdown protection

Ultra-power delay shutdown protection is the power adapter in the development process, must have an output overload protection technology. power adapter In a delayed trip system, the requirement for a short-time transient current is permissible and the power supply is turned off only when the current stress exceeds a safe value for a long time. The provision of short transients will not compromise the reliability of the power supply and will not have a significant impact on the cost of the power supply. Only long-term continuous current requirements will affect the cost and size of the circuit.

Method 3, flyback over power limit protection method

Counterattack super power protection method is currently in the domestic adapter R & D and manufacturers of the production process is widely used, this protection technology is an extension of the form of speed, in this form there is a circuit to monitor the primary and secondary voltage , Reducing the power when the output voltage is reduced. In this way, when the load resistance decreases, power adapter the output current is reduced to prevent the secondary components from being subjected to excessive stress damage. The disadvantage is that a lock occurs when used for non-linear loads.

Method 4, constant power limit protection method

Constant input power limiting protection method is one of the most common switching power adapter output protection technology in the world. The protection principle of this method is to protect the primary circuit by limiting the maximum transmission power. However, in the flyback converter, this technique can hardly protect the secondary output element. power adapter For example, in a discontinuous flyback converter, the primary side peak current has been limited, that is, given the limited transmit power.