Control method and circuit of buck-boost converter
By setting the time threshold and the ripple voltage signal feedback signal to control the mode switching of the buck-boost converter, the problem of slow response speed in the prior art is solved, and faster response and more stable output voltage are achieved.
CN120601746APending Publication Date: 2025-09-05SG MICRO CORP
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Patent Information
- Application Number
- CN202510630442.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-15
- Publication Date
- 2025-09-05
AI Technical Summary
Technical Problem
The existing buck-boost converter control circuit requires a compensation circuit, which results in a slow transient response speed and affects the stability of the output voltage.
Method used
The mode switching is determined by using a set time threshold and a feedback signal of the ripple voltage signal of the output voltage in the inductor current. The on-time of the four power switches is controlled by a loop feedback module and a logic control module, avoiding the error amplifier and compensation network and improving the response speed.
Benefits of technology
The switching response speed of the four power switches is improved, and the stability of the output voltage is enhanced.
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Figure CN120601746A_ABST
Abstract
The embodiment of the invention provides a control method and circuit of a buck-boost converter. The control circuit comprises the steps that a loop feedback module obtains a feedback signal of output voltage under the effect of a ripple voltage signal of current of an inductor; when the buck-boost converter works in a buck mode, and second conduction time of simultaneous conduction of a second power switch and a fourth power switch controlled by a feedback signal is less than a first time threshold value of the buck mode, the logic control module controls the buck-boost converter to be converted from the buck mode to the buck-boost mode; and when the buck-boost converter works in the buck-boost mode and the first conduction time representing simultaneous conduction of the first power switch and the third power switch is greater than a second time threshold of the boost mode, controlling the buck-boost converter to be converted from the buck-boost mode to work in the boost mode. The embodiment of the invention is suitable for the mode switching process of the buck-boost converter.
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