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Slope wave injection circuit with error compensation and error compensation method in switching power supply

An error compensation, switching power supply technology, applied in electrical components, output power conversion devices, conversion equipment without intermediate conversion to AC, etc., can solve problems such as switching power supply output errors, and achieve the effect of eliminating output errors.

Active Publication Date: 2022-04-08
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

Method used

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  • Slope wave injection circuit with error compensation and error compensation method in switching power supply
  • Slope wave injection circuit with error compensation and error compensation method in switching power supply
  • Slope wave injection circuit with error compensation and error compensation method in switching power supply

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Embodiment Construction

[0027] 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.

[0028] 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 le...

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Abstract

The ramp wave injection circuit with error compensation and the error compensation method in the switching power supply, the ramp voltage generation module in the ramp wave injection circuit generates a ramp voltage according to the first control signal, and the error compensation module filters the reference voltage according to the first control signal Controlling the generation of compensation voltage, when the first control signal is in the first state, the voltage value of the control ramp voltage rises linearly, the filter filters the reference voltage, and when the first control signal is in the second state, the voltage value of the control ramp voltage is zero 1. The input terminal of the filter is grounded, and the ramp voltage or the reference voltage is adjusted so that the compensation voltage output by the filter is equal to the peak voltage of the ramp voltage, and the final ramp voltage is obtained by subtracting the compensation voltage from the ramp voltage. When the present invention is applied to a switching power supply, the reference voltage is superimposed on the ramp voltage and the compensation voltage is subtracted as the final comparison reference, so that the comparison reference is constant, the output voltage remains constant under different duty ratios, and the error caused by the ramp voltage 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 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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