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A Slope Injection Circuit and Switching Power Supply Error Compensation Method Not Affected by Duty Cycle

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

Active Publication Date: 2022-03-29
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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  • A Slope Injection Circuit and Switching Power Supply Error Compensation Method Not Affected by Duty Cycle
  • A Slope Injection Circuit and Switching Power Supply Error Compensation Method Not Affected by Duty Cycle
  • A Slope Injection Circuit and Switching Power Supply Error Compensation Method Not Affected by Duty Cycle

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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 ramp wave injection circuit and the switching power supply error compensation method not affected by the duty cycle, the ramp voltage generation module is used in the ramp wave injection circuit to generate a ramp voltage whose voltage value rises linearly under the control of the first control signal, only when the second When a control signal changes from the first state to the second state, the voltage value of the control ramp voltage is reset to zero; the error compensation module is used to sample the peak voltage of the ramp voltage as the compensation voltage, and the ramp injection circuit subtracts the compensation from the ramp voltage voltage as the final ramp voltage output. When the present invention is applied to a switching power supply, it can solve the problem of output error introduced due to the relationship between the ramp voltage and the duty cycle of the switching device in the switching power supply in the traditional switching power supply with an internal integrated ramp wave injection circuit, and realize the adjustment of the ramp wave The peak value of the voltage produces error compensation in the system, so that the output voltage of the switching power supply remains constant under 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 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. Such as figure 1 As shown, in the fixed on-time switching power supply with integrated internal slope injection circuit, the slope injection circuit g...

Claims

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Application Information

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Patent Type & Authority Patents(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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