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USB-C Adapter Widely Used Jun 09, 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 constant current and voltage conversion, the engineers typically provide appropriate output overload protection for the USB-C Adapter, To ensure safe operation of the USB-C Adapter. Introduced two kinds of current application of a wide range of output overload protection technology

1. Constant power limit protection method

The constant input power limit protection method is one of the more common switching power supply output protection technologies. 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. 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 in the consumption of 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 over-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.