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Slope Injection Circuit and Its Error Compensation Method in Switching Power Supply

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

Active Publication Date: 2022-03-29
成都稳海半导体有限公司
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  • Summary
  • 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

Method used

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  • Slope Injection Circuit and Its Error Compensation Method in Switching Power Supply
  • Slope Injection Circuit and Its Error Compensation Method in Switching Power Supply
  • Slope Injection Circuit and Its 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 ...

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Abstract

A slope injection circuit and its error compensation method in a switching power supply, wherein the slope voltage generating module includes a capacitor and a charging current generating unit, and the charging current generating unit is used to generate charging related to the difference between the output voltage of the switching power supply and the reference voltage Current; the ramp voltage generating module is controlled by the control signal, when the control signal is in the first state, the capacitor is charged with the charging current to increase the voltage on the capacitor, and when the control signal is in the second state, the capacitor is discharged, so that the voltage on the capacitor reduce to zero; the error compensation module is used to generate a compensation voltage proportional to the reference voltage, and subtract the compensation voltage from the voltage on the capacitor as the final ramp voltage. When the present invention is applied to a switching power supply, the reference voltage is superimposed on the voltage on the capacitor and the compensation voltage is subtracted as the final comparison reference, so that the comparison reference is constant, and the output voltage of the switching power supply under different duty ratios is kept constant, and the slope is eliminated. The error caused by the wave voltage.

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 with an error compensation function, and a method for error compensation using the ramp wave injection circuit proposed by the invention in a switching power supply. 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 generates the slope voltage Vripple and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/088H02M3/07
CPCH02M1/088H02M3/07
Inventor 向本才
Owner 成都稳海半导体有限公司
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