What are the power adapter maintenance methods?
Power adapter maintenance method: pulse-by-pulse super power or over current limit, super power delay off protection, flyback super power limit, constant power limit maintenance method.
Method 1, the power adapter pulse-by-pulse super power or over current limit
Over-power or over-current limiting on pulse-by-pulse is a very effective output overload protection method in practical applications. This technique is often used in additional secondary-side current limiting maintenance. In previous switching devices, the input current was monitored in real time. If this current exceeded the specified limit current value, the turn-on pulse was terminated. In a non-continuation flyback converter, its large current determines the power of the circuit. This type of maintenance circuit becomes a real power limiting maintenance circuit.
Method 2, the adapter super power delay shutdown protection
The ultra-power delay shutdown protection is an output overload protection technology that must be provided during the development of the power adapter. In a time-delayed trip system, the requirement for short-term transient currents is tolerated only when the current stress exceeds the safe value for a long time. The provision of short transient currents will not compromise the reliability of the power supply, nor will it have a significant impact on the cost of the power supply. Only the requirement to temporarily continue the current will affect the cost and volume of the circuit.
Method 3, power adapter flyback ultra power limit maintenance method
Counter-attack super power maintenance method is currently widely used in adapter development and manufacturer production process. This maintenance technology is an extension of the upper speed form. There is a circuit to monitor the primary current and secondary voltage, and output. Reduce power when voltage drops. In this way, the output current is reduced when the load resistance is lowered, and the secondary component is prevented from being subjected to excessive stress damage. The disadvantage is that the locking phenomenon occurs when used for a non-linear load.
Method four, switching power adapter constant power limit maintenance method
The constant input power limit maintenance method is one of the most common output maintenance technologies for switching power supply adapters. The maintenance principle of this method is to maintain the primary side circuit by limiting the large transmission power. However, in a flyback converter, this technique can hardly maintain the secondary output components. For example, in a discontinuous flyback converter, the primary peak current is already limited, that is, the limited transmit power is given.
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