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Offset voltage eliminating circuit

An offset voltage and circuit technology, which is applied in the direction of adjusting electrical variables, electrical components, control/regulation systems, etc., can solve problems such as output voltage imbalance, and achieve the effect of improving adjustment accuracy

Inactive Publication Date: 2016-10-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] What the present invention aims to solve is to provide a dynamic elimination circuit for its output voltage imbalance in view of the stability and adjustment accuracy problems brought about by the current self-adaptive on-time control system

Method used

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Embodiment Construction

[0015] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0016] The equivalent frame diagram of the control loop of the whole system of the present invention can be as follows figure 1 As shown, SW is the switch output node of the system, and the output VOUT is divided by the resistors Rf1 and Rf2 to obtain the feedback voltage VFB. The invention adopts an on-chip compensation technology, obtains a sawtooth wave including DC information and inductor current information by filtering the potential information of SW, and obtains its DC component by using a circuit. Then use the subtraction circuit to make a difference to extract its AC component, that is, to obtain the required ripple information in the same direction as the inductor current. Then add it to the feedback signal VFB through the ripple superposition circuit, so as to ensure that the ripple of the output capacitor with phase lag is weaker than the ripple ...

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Abstract

The invention belongs to the technical field of electronic circuits, and relates to an offset voltage eliminating circuit. An on-chip compensation technology is adopted, sawtooth wave including DC information and inductive current information is obtained by performing filtering processing on potential information of SW, and DC components are obtained by utilizing the circuit. Then AC components are extracted by utilizing a subtraction circuit to perform subtraction so as to obtain ripple information homonymous with the required inductive current. Then the ripple information and feedback signals VFB are added through a ripple superposition circuit so that phase lagged output capacitor ripple is enabled to be weaker than the compensated ripple, and stable working of the system can be ensured; meanwhile, repeated design of the parameters of the conventional off-chip ripple compensation circuit under different applications can be avoided and the range of application of the circuit can be increased.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to an offset voltage elimination circuit. Background technique [0002] Compared with the traditional voltage mode control or current mode control, the control system based on output ripple has the characteristics of faster transient response and simple control loop, especially the ripple control based on constant on-time The potential of adaptive constant frequency characteristics has attracted much attention. [0003] However, in the constant conduction control mode, the feedback voltage VFB triggers the Ton timing by constantly triggering the valley limit (reference level Vref). There is a certain offset voltage ΔV between the DC level of the feedback voltage VFB and the reference voltage Vref, and this offset is the system imbalance caused by the system control structure. As a result, there is a deviation between the actual output voltage value and the ideal set value...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M1/14
CPCH02M1/143H02M3/156
Inventor 周泽坤徐俊冯捷斐李天生石跃王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA