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Switching converter and control circuit thereof

A technology for switching converters and control circuits, applied in control/regulation systems, converting DC power input to DC power output, instruments, etc., can solve the problems of switching converters with a large range of frequency changes, and improve the frequency range. Increase the range, the effect of increasing the range

Pending Publication Date: 2022-06-21
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] In view of the above problems, the object of the present invention is to provide a switching converter and its control circuit, which solves the problem that the existing switching converter has a large frequency variation range under the condition of low input voltage

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  • Switching converter and control circuit thereof
  • Switching converter and control circuit thereof
  • Switching converter and control circuit thereof

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Embodiment Construction

[0041] Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, the same elements are designated by the same or similar reference numerals. For the sake of clarity, various parts in the figures are not drawn to scale. Additionally, some well-known parts may not be shown.

[0042] It should be understood that, in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connection. When an element or circuit is referred to as being "connected" to another element or an element / circuit is "connected" between two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directl...

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Abstract

The invention discloses a switching converter and a control circuit thereof. The control circuit comprises a hysteresis voltage control circuit which generates a hysteresis voltage according to a first feedback signal of the DC output voltage; the PWM comparator is used for comparing a superposed signal of the second feedback signal of the direct current output voltage and the ripple signal with the hysteresis voltage so as to generate a pulse width modulation signal; and the logic and driving circuit is used for converting the pulse width modulation signal into a switch control signal so as to control the conduction state of at least one switch tube, so that the switching converter can adaptively change the size of a hysteresis window according to the direct current output voltage, and the frequency stability range is widened.

Description

technical field [0001] The present invention relates to the technical field of switching power supplies, and more particularly, to a switching converter and a control circuit thereof. Background technique [0002] Switching converters have been widely used in electronic systems to generate operating voltages and currents required by internal circuit modules or loads. The switching converter uses a power switch tube to control the power transmission from the input end to the output end, so that a constant output voltage and / or output current can be provided at the output end. In switching converters, the ripple-based constant on-time control method evolved from hysteresis mode has the advantages of constant system frequency, good light-load efficiency, fast transient response, and easy implementation, so it has been widely used in recent years. Applications. [0003] figure 1 A schematic circuit diagram of a switching converter with a fixed hysteresis control mode and a co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M3/158H02M1/088
CPCH02M3/156H02M3/1582H02M1/088
Inventor 张宝全孙健李精文
Owner SG MICRO