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Oblique wave injection circuit based on oblique wave reset and error compensation method in switching power supply

A technology of injection circuit and switching power supply, which is used in ramp injection circuit for error compensation, and in the field of ramp injection circuit, it can solve problems such as switching power supply output error, and achieve the effect of eliminating output error and keeping output voltage constant.

Active Publication Date: 2021-05-28
成都稳海半导体有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen that the traditional ramp injection circuit will cause the switching power supply to introduce output errors, and it is necessary to propose a ramp injection circuit that can compensate output errors

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  • Oblique wave injection circuit based on oblique wave reset and error compensation method in switching power supply
  • Oblique wave injection circuit based on oblique wave reset and error compensation method in switching power supply
  • Oblique wave injection circuit based on oblique wave reset and error compensation method in switching power supply

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Embodiment Construction

[0034]In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] It should be noted that in the present invention, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. For example, the first state and the second state of the control signal can be interchanged. It can be that the first state represents high l...

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Abstract

The invention relates to a ramp injection circuit based on ramp reset and an error compensation method in a switching power supply. In the ramp injection circuit, a ramp voltage generation module is used for generating ramp voltage with a linearly increased voltage value under the control of a first control signal; controlling the voltage value of the ramp voltage to be reset to zero only when the first control signal is converted from the first state to the second state; the error compensation module is used for generating compensation voltage proportional to reference voltage, and the oblique wave injection circuit subtracts the compensation voltage from the oblique wave voltage to output a result as final oblique wave voltage. When the oblique wave injection circuit is applied to the switching power supply, the oblique wave voltage is irrelevant to the working duty ratio of a switching device in the switching power supply, so that the problem of an output error caused by the fact that the oblique wave voltage is relevant to the working duty ratio of a switching device in a traditional switching power supply internally integrated with an oblique wave injection circuit is solved; the output voltage of the switching power supply is kept constant under the condition of different duty ratios, and the output error of the switching power supply is eliminated.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and relates to a ramp wave injection circuit, in particular to a ramp wave injection circuit based on ramp wave reset technology and with error compensation function, and a switching power supply using the ramp wave injection circuit proposed by the present invention. method of error compensation. Background technique [0002] With the development of technology, in order to meet the market demand, the requirements for switching power supply are getting higher and higher, and switching power supply is usually required to have the advantages of fast response speed and so on. In order to simplify the peripheral components and reduce the output ripple, the switching power supply with fixed on-time integrates a slope injection circuit inside. Such as figure 1 As shown, in the fixed on-time switching power supply with integrated internal slope injection circuit, the slope injection circuit ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/088
CPCH02M1/088
Inventor 向本才
Owner 成都稳海半导体有限公司
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