Fixed On-Time Switching Converter

Abstract

The invention discloses a constant conduction time switching conversion device, which includes a transformer. The transformer has a primary side and a secondary side. The primary side is connected to an electronic switch, and the secondary side is connected to a load and a processor. The processor is connected to a driver on the primary side through at least one coupling element, so as to connect to the electronic switch. The processor receives an output voltage or an output current on the load to generate a control signal accordingly. The driver receives the control signal through the coupling element, and switches the electronic switch accordingly to control the transformer to adjust the output voltage and output current. The duration of the switching state of the electronic switch is determined by the time point when the negative edge of the control signal rises to the positive edge and the positive edge It is determined by the time point of falling to the negative edge to achieve high-speed load transient response.

Description

technical field [0001] The present invention relates to a switching switching device, and more particularly to a constant on-time (COT) switching switching device. Background technique [0002] In recent years, with the advancement of science and technology, electronic products with various functions have been gradually developed. These electronic products with various functions not only meet the various needs of people, but also integrate into everyone's needs. Daily life makes people's life more convenient. These various electronic products with different functions are composed of various electronic components, and the power supply voltage required by each electronic component is not the same. Therefore, the AC power provided by today's power supply system is not suitable for direct supply to electronic product use. In order to provide an appropriate voltage for each electronic component to operate normally, these electronic products need to use a power conversion circui...

AI Technical Summary

Problems solved by technology

However, since the controller 22 is located on the primary side, it cannot directly detect the load voltage, and the TL431 and the compensation circuit cannot transmit the signal in the load voltage to the controller 22 in real time. Instead, the signal in the load voltage will be delayed and deformed, or even changed Slowly, it is transmitted to the controller 22, causing the controller 22 to respond to the ripple signal in the load voltage in real time, changing the switching mode of the electronic switch 12, and then quickly stabilizing the load voltage

Furthermore, a diode 24 connected to the secondary side acts as a synchronous rectifier, but it is not easy to control in continuous current mode (CCM)

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