Buffer switch circuit

Abstract

The invention discloses a buffer switch circuit. The circuit comprises a buffer module, a switch module and a rectification module which are connected through leads, wherein the buffer module is used for buffering the switching-on pulse rising edge and the switching-off pulse failing edge of the switch module; the switch module is used for realizing the closing and opening of a circuit passage; the rectification module is used for rectifying an output voltage; and a rectification protection module is used for preventing the reverse breakdown of the rectification module. According to the buffer switch circuit disclosed by the invention, the buffer module is added on the basis of the switch circuit in the prior art, so that a switch pipe is high in speed and low in conduction loss; and the rectification protection module can prevent the reverse breakdown of a rectification diode and guarantee the normal work of the switch circuit.

Description

technical field [0001] The invention relates to a switch circuit, in particular to a buffer switch circuit. Background technique [0002] The switching power supply is mainly used for power conversion, and the energy conversion part mainly completes the energy conversion process by turning on and off the switch tube. Such as Figure 1 to Figure 3 As shown, there are two basic topological forms of switching power supply energy converters, namely boost chopper (Boost) topology and buck chopper (Buck) topology, and any other topologies are variants of these two basic topologies. Since the appearance of switching power supplies, the industry has been committed to improving the power density of switching power supplies, and one of the main means is to increase the operating frequency. As the operating frequency increases, the capacity of the main energy storage devices in the energy conversion topology, such as the inductor L and the capacitor C, can decrease linearly, thereby r...

AI Technical Summary

Problems solved by technology

However, as the switching frequency increases, the loss of the switch S, an important device in the topology, will also increase linearly, so the conversion efficiency will decrease, which is an important factor hindering the miniaturization of switching power supplies

[0003] Taking MOSFET, a switching device commonly used in switching power supplies, as an example (it can also be applied to IGBT), the MOSFET switch tube is a channel type, which is equivalent to a water gate. The longer the wide switching time, and the switching loss is proportional to the switching time

So this is a contradiction, it is impossible to use a single switch tube to achieve a high-speed and low conduction loss switching circuit

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