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An Offset Voltage Elimination Circuit Based on cot Control Mode

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

Inactive Publication Date: 2018-06-19
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 COT output voltage imbalance in view of the stability and adjustment accuracy problems brought about by the current COT control system

Method used

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  • An Offset Voltage Elimination Circuit Based on cot Control Mode
  • An Offset Voltage Elimination Circuit Based on cot Control Mode
  • An Offset Voltage Elimination Circuit Based on cot Control Mode

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Embodiment Construction

[0014] Below in conjunction with accompanying drawing, describe technical scheme of the present invention in detail:

[0015] 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 a phase lag is weaker than the rippl...

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Abstract

The invention belongs to the technical field of electronic circuits and relates to an offset voltage elimination circuit based on a COT control mode. The invention adopts an on-chip compensation technology, obtains a sawtooth wave including DC information and inductance current information by filtering the potential information of SW, and uses a circuit to obtain its DC component. 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 after compensation, and ensure the stable operation of the system; at the same time, it avoids the traditional on-chip The parameters of the external ripple compensation circuit need to be designed repeatedly, which increases the scope of application of the circuit.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits and relates to an offset voltage elimination circuit based on a COT control mode. 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 v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/158H02M1/0016
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