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Oblique wave injection circuit immune to duty ratio and switching power supply error compensation method

A technology of injecting circuits and switching power supplies, applied in electrical components, output power conversion devices, etc., can solve problems such as switching power supply output errors, and achieve the effect of eliminating output errors

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 immune to duty ratio and switching power supply error compensation method
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  • Oblique wave injection circuit immune to duty ratio and switching power supply error compensation method

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Embodiment Construction

[0031] 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.

[0032] 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 ...

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Abstract

The invention relates to an oblique wave injection circuit immune to a duty ratio and a switching power supply error compensation method. According to the oblique wave injection circuit, an oblique wave voltage generating module is used to generate oblique wave voltage of which the voltage value is linearly increased under the control of a first control signal, the voltage value of the oblique wave voltage is controlled to be reset to zero only when the first control signal is converted from a first state to a second state; an error compensation module samples the peak voltage of the oblique wave voltage as a compensation voltage; the oblique wave injection circuit subtracts the compensation voltage from the oblique wave voltage and outputs a result as a final oblique wave voltage. When the oblique wave injection circuit is applied to a switching power supply, the problem of output errors caused by the fact that the oblique wave voltage is related to the working duty ratio of a switching device in a traditional switching power supply internally integrated with an oblique wave injection circuit can be solved, and compensation of errors generated by the peak value of the oblique wave voltage on a system is achieved, the output voltage of the switching power supply under different duty ratios is kept constant, 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 injection circuit with error compensation function, in particular to a ramp injection circuit based on ramp reset and peak sampling, and a switching power supply using the ramp injection circuit proposed by the present invention. A method for error compensation in a circuit. 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. like figure 1 As shown, in the fixed on-time switching power supply with integrated internal slope injection circuit, the slope injection circuit gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08
CPCH02M1/08
Inventor 向本才
Owner 成都稳海半导体有限公司
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