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DC-DC converter control system and method and DC-DC converter

A DC-DC and control system technology, applied in control/regulation systems, output power conversion devices, instruments, etc., can solve the problems of voltage conversion efficiency reduction, static current consumption, etc., and achieve the effect of improving voltage conversion efficiency

Active Publication Date: 2022-04-29
上海先楫半导体科技有限公司
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AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a DC-DC converter control system, method and DC-DC converter, which are used to solve the two kinds of work of the DC-DC converter in the prior art. Quiescent current is consumed during mode switching, resulting in a decrease in voltage conversion efficiency

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  • DC-DC converter control system and method and DC-DC converter
  • DC-DC converter control system and method and DC-DC converter
  • DC-DC converter control system and method and DC-DC converter

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Embodiment Construction

[0051] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0052] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the drawings rather than the number, shape and size of components...

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Abstract

The invention provides a control system and method for a DC-DC converter and the DC-DC converter, and the method comprises the steps: detecting the charging and discharging times of an inductor in a charging period in a PFM mode, and switching the working mode of the DC-DC converter into a PWM mode if the charging and discharging times reach preset times; in the PWM mode, the PWM duty ratio is detected, and if the PWM duty ratio is smaller than a first threshold value, the working mode of the DC-DC converter is switched into the PFM mode. According to the DC-DC converter, extra quiescent current does not need to be consumed, the voltage conversion efficiency of the DC-DC converter in the light load state can be greatly improved, and meanwhile the DC-DC converter has the transient response performance that when the current is suddenly increased, the PFM mode can be rapidly switched to the PWM mode.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a control system and method for a DC-DC converter and the DC-DC converter. Background technique [0002] With the widespread use of portable electronic devices, usage scenarios powered by batteries have become necessary. In order to maximize battery life, an excellent power management module needs to ensure high power conversion efficiency at both light and heavy loads, and have fast and stable transient response capabilities when the load changes instantaneously. DC-DC converters are widely used due to their high voltage conversion efficiency. In order to have high voltage conversion efficiency at both light load and heavy load, the controller of the DC-DC converter often uses PFM (Pulse-Frequency Modulation, pulse frequency modulation) control mode at light load and uses PWM (Pulse-Width Modulation, pulse width modulation) control mode. [0003] In order to reali...

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Application Information

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IPC IPC(8): H02M3/156H02M3/157
CPCH02M3/156H02M3/157Y02B70/10
Inventor 吴晓闻田磊张菁健
Owner 上海先楫半导体科技有限公司
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