A High Efficiency Compact Fast Charging Source

Abstract

The invention discloses a high-efficiency compact fast charging source, which includes a flyback switch circuit and a drive protection circuit, wherein the flyback switch circuit includes a flyback transformer, a power switch and a power switch for suppressing voltage overshoot and oscillation. The absorption circuit, the power switch includes a gallium nitride switching device; the driving protection circuit includes a voltage stabilization source and a diode for connecting the voltage stabilization source and the power switch. The present invention uses a D-type or E-type gallium nitride device as a power switch device in a flyback circuit, and at the same time improves the drive protection circuit in the flyback circuit to control the off bias voltage of the power switch, which not only reduces the switching loss, Also improves the circuit stability.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a high-efficiency compact fast charging source. Background technique [0002] With the miniaturization of electronic products, portable electronic devices such as smart phones and laptops are more and more widely used in people's lives, and each portable electronic device needs to be equipped with a battery charger. Due to the different battery capacities of various portable electronic devices and the incompatibility of charging interfaces, almost everyone or every family needs to have multiple different chargers, and because the efficiency and power density of the older generation chargers are relatively low , The volume and weight of the charger are relatively large, and the charging speed is relatively slow. This phenomenon needs to be improved with the advancement of technology. [0003] With the development of power electronics technology and information technology, a new gene...

AI Technical Summary

Problems solved by technology

Since the switching loss of the power supply is generally proportional to the switching frequency, especially when the flyback circuit topology is used, the leakage inductance loss of the isolation transformer is often greater than the loss of the power switching device during the high-frequency switching operation. The loss makes the efficiency of the power supply decrease with the increase of the switching frequency, which further causes the overheating of the power device and the entire product. Therefore, how to increase the switching frequency while maintaining high efficiency has become a challenge for the design of a new generation of fast charging power supply.

In addition, because the new generation of fast charging sources must be able to meet the battery charging requirements of all portable electronic devices, the output voltage range is very wide, at least need to cover the range of 5V to 20V, and the load current variation range is also very wide, how to maintain in this case Optimum power efficiency and reliable operation of power devices is also a challenging design topic

On the other hand, because the space design of the new generation of fast charging sources is very compact, the electromagnetic interference coupling between components and wires is relatively strong, which makes the electromagnetic compatibility design more challenging.

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