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USB-C Adapter Extensive Output Overload Protection Technology Jun 30, 2017

In order to ensure that the USB-C Adapter is able to meet the operating requirements of different environments during the development of new switching power supply USB-C Adapters and to provide users with continuous and stable current and voltage conversion, engineers typically provide appropriate output overload protection for the USB-C Adapter, To ensure safe operation of the USB-C Adapter. Introduce two widely used output overload protection technologies

1. Constant power limit protection method

Constant input power limiting protection method is one of the more common switching power USB-C Adapter output protection technology, this method is to protect the principle of limiting the maximum transmission power to protect the primary circuit. However, in the flyback converter, this technique can hardly protect the secondary output element. For example, in a discontinuous flyback converter, the primary side peak current has been limited, that is, given the limited transmit power. When the load resistance is reduced and the load exceeds its limit, the output voltage begins to drop. It is precisely because the specified input and the corresponding output voltage and current product, when the output voltage began to decline, the output current will rise. In the short circuit, the secondary current will become very large, in the switching power supply to consume all the power. This form of power limitation is generally only used as a supplement to some form of supplemental restrictions, such as secondary side current limiting.

2. Flyback super power limit protection method

Counterattack super power protection method is currently in the domestic USB-C Adapter R & D and manufacturers of the production process is more extensive, 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, 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.