Converter switch current decoupling circuit

Abstract

The invention relates to a converter switch current decoupling circuit; for Buck, Boost and Buck-Boost converters, a switch current decoupling circuit is represented by taking an energy storage element as a center and a public branch, and with separated switch tube branch and diode branch; for Cuk and Zeta converters, if the branch circuit wherein an energy storage capacitor is located serves as the center branch of the circuit, the branch circuits where a first inductor and a first diode are located are arranged on the upper left and upper right of the central branch with an angle of 45 degrees; and branch circuits where a first switch tube and a second inductor are located are arranged on the lower left and lower right of the central branch with an angle of 45 degrees. Due to the adoption of the scheme, the circuit is simple and symmetrical, the physical process of energy storage and release of the energy storage element under the effect of the switch tube and the diode is achieved,the circuit is simple and easy to learn, and the circuit is a beneficial supplement of the existing basic DC-DC converter principle description.

Description

technical field [0001] The invention belongs to the field of electronics, in particular to an equivalent circuit of a converter. Background technique [0002] The existing basic DC-DC converters (including Buck, Boost, Buck-Boost, Cuk and Zeta) all adopt the power supply-switching unit-load description method in the circuit description, that is, the power supply supplies power to the load after being transformed by the switching unit. Such as Figure 1 to Figure 5 shown. Without loss of generality, taking Buck as an example, the power source is Vi, the switch tube S, diode D and inductor L together constitute the switching unit, the load is R, and C is the filter capacitor. [0003] The above circuits are all controlled by a single switch, so there are two working processes of the switch being turned on and the switch being turned off. There are two ways to describe the work process. Method 1 adopts the method of drawing circuit diagrams of the switching tube on-circuit a...

AI Technical Summary

Problems solved by technology

[0005] Comparing the two description methods, it can be seen that the first method is used to describe the working process, and the turn-on process and the shutdown process are described separately. The working process is clear and easy to understand, but the drawing is complicated and must be described with two pictures; the second method is used Describe the working process, the turn-on process and the turn-off process are combined and described. Only one picture can describe the two working processes, but the working process is not clear enough and difficult to understand, especially for Cuk and Zeta converters, the conduction current The flow path of the flow path and the flow path of the shut-off current are mixed together, which brings a lot of inconvenience to beginners

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