Overshoot voltage control method and circuit and switching converter

By designing an overshoot voltage control circuit for a switching converter, the on-time and feedback voltage during the transient change of load are detected, and the power tube is turned off based on the judgment result, the problem of overshoot voltage in the prior art increases the circuit area, and the overshoot voltage in the miniaturized and thinner products is realized.

CN119726583APending Publication Date: 2025-03-28SG MICRO CORP
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Patent Information

Application Number
CN202411907479.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-23
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing methods of reducing the overshoot voltage on the output voltage will lead to an increase in the circuit area, making it difficult to achieve miniaturization and thinning products.

Method used

An overshoot voltage control circuit is designed, including an on-time detection module, a feedback voltage detection module, an overshoot voltage control module and a driving control module. When the load changes transiently, the on-time and feedback voltage of the power tube are detected. If the on-time is greater than the steady-state value and the feedback voltage is greater than the preset reference voltage, an overshoot voltage control signal is generated, and the power tube is turned off under control, thereby reducing the energy transferred by the inductor to the output capacitor.

Benefits of technology

By reducing the slope of the inductor current, the overshoot voltage on the output voltage is reduced, and the overshoot voltage in transient response is reduced without increasing external components and changing system applications.

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Abstract

The embodiment of the invention provides an overshoot voltage control method and circuit and a switching converter, the circuit comprises a conduction time detection module, a feedback voltage detection module, an overshoot voltage control module and a driving control module, the conduction time detection module is used for detecting the conduction time of a lower power tube of the switching converter in the transient change process of a load, and the feedback voltage detection module is used for detecting the feedback voltage of the overshoot voltage control module; judging whether the turn-on time is greater than a steady-state value or not; the feedback voltage detection module is used for detecting the feedback voltage of the output voltage of the switching converter in the transient change process of the load and judging whether the feedback voltage is greater than a preset reference voltage or not; the overshoot voltage control module is used for generating an overshoot voltage control signal according to a first judgment result output by the conduction time detection module and a second judgment result output by the feedback voltage detection module; and the driving control module is used for controlling the turn-off of the lower power tube according to the overshoot voltage control signal. The problem that an existing mode of reducing overshoot voltage on output voltage can cause large occupied circuit area is solved.
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