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Abnormal multi-pulse elimination circuit for converter

A technology for eliminating circuits and converters, applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., can solve problems such as output voltage jitter, achieve the effect of removing resistors and capacitors, and optimizing circuit characteristics

Pending Publication Date: 2022-04-12
SOUTHCHIP SEMICON TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at solving the problem of the output voltage jitter caused by the abnormal pulse injection caused by the structure of the existing ripple injection in the case of DCM, and proposes an abnormal pulse elimination circuit for the converter

Method used

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  • Abnormal multi-pulse elimination circuit for converter

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Embodiment Construction

[0009] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0010] The present invention utilizes the idea of ​​feedback and combines the working states of each point when the circuit is working. Since there is a forward path in the existing circuit, the SW voltage can affect the internal ripple injection point through the resistance and capacitance under certain conditions. The invention introduces a negative sw voltage path (-gm) to offset the influence of the positive path. The switch is only turned on in DCM, and will not affect the normal circuit loop operation in other working states.

[0011] Such as figure 1 As shown in the schematic diagram of the circuit of the present invention, with the help of the existing transconductance operational amplifier inside the circuit, a current related to the sw point is generated at the ripple injection point, which is used to eliminate the sw point through the resistance-capacitan...

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Abstract

The invention belongs to the technical field of analog integrated circuits, and particularly relates to an abnormal multi-pulse elimination circuit for a converter. According to the invention, the whole circuit is modified in the circuit, a capacitor is newly added from the sw point to couple internal nodes, and reverse is carried out through internal ota, so that the influence caused by the sw point is suppressed. According to an existing ripple insection, filtering processing is carried out on a point only through a capacitor in a circuit, however, in order to achieve the optimal elimination effect, the size of a resistor and a capacitor is large, and the requirement for the area of the circuit is very strict, the resistor and the capacitor in the circuit can be removed by simply adjusting the circuit, and the circuit characteristic can be optimized.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a multiple pulse elimination circuit for a converter. Background technique [0002] At present, there are many working modes of the DCDC system, and various application environments require different modes to meet their application requirements. Among various control modes, the method of ripple injection at the output terminal has been particularly favored in recent years because it can directly sample the ripple at the external output terminal to the internal controller. The advantage of this mode is that the ripple at the output can be involved as a system variable, which can effectively control the ripple at the output. The efficiency of the circuit is optimized. When the system is in DCM mode, the SW point is at the moment when the lower tube is turned off. There is an LC resonance composed of the external inductance L1 and the external capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M1/44H02M1/14H02M1/088
Inventor 王佳煜李芝友
Owner SOUTHCHIP SEMICON TECH SHANGHAI CO LTD