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Current sampling and limiting circuit of four-switch Buck-Boost converter

A current sampling and limiting circuit technology, which is applied in the field of current sampling and limiting circuits and analog integrated circuits, can solve the problems of increased power consumption and achieve the effects of short delay time, high sampling accuracy and short delay

Active Publication Date: 2019-10-18
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This current detection method is simple in structure and has high precision, but the detection resistor R SENSE The current flowing above will generate corresponding power consumption. As the current increases, the power consumption will also increase, and only the valley current of the inductor current can be detected and limited.

Method used

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  • Current sampling and limiting circuit of four-switch Buck-Boost converter
  • Current sampling and limiting circuit of four-switch Buck-Boost converter
  • Current sampling and limiting circuit of four-switch Buck-Boost converter

Examples

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Embodiment 1

[0038] This embodiment provides a current sampling and limiting circuit of a four-switch Buck-Boost converter, such as figure 1 , 3 , Shown in 4, comprise transconductance amplifier Gm circuit 1, current limiting comparator COMP circuit 2; Wherein:

[0039] The transconductance amplifier Gm circuit is used to sample the sampling resistor R SENSE voltage on and converts to a sampled current I SENSE ;Sampling current I SENSE with slope compensation current I SLOP Through resistance R P Perform superposition and summation to obtain the voltage V S Input to the non-inverting input of the pulse width modulator PWM; the output voltage of the error amplifier V C Input for the inverting terminal of the pulse width modulator PWM, the voltage V S with V C The pulse control signal PWM is output by comparison with the pulse width modulator PWM;

[0040] The current limit comparator COMP circuit is used to limit the inductor current, the sense resistor R SENSE The voltage on the...

Embodiment 2

[0056] This embodiment provides a current sampling and limiting circuit of a four-switch Buck-Boost converter, such as figure 1 , 3 , Shown in 5, comprise transconductance amplifier Gm circuit 1, current limiting comparator COMP circuit 2;

[0057] The specific structure and connection method of the transconductance amplifier Gm circuit 1 of this embodiment are the same as those of the first embodiment.

[0058] As a specific solution of this embodiment, such as Figure 5 As shown, the current limiting comparator COMP circuit 2 of the present embodiment is comparator COMP1, comparator COMP2, inverter INV3, two-input AND gate AND1, two-input AND gate AND2 and two-input OR gate OR; wherein:

[0059] The non-inverting input terminal of the comparator COMP1 is connected with the reference voltage signal V TH_Buck phase connection, the inverting input is connected to the input signal V CS It is connected with the non-inverting input terminal of the comparator COMP2, and its ou...

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Abstract

The invention provides a current sampling and limiting circuit of a four-switch Buck-Boost converter. The current sampling and limiting circuit comprises a transconductance amplifier Gm circuit and acurrent limit comparator COMP circuit, wherein the transconductance amplifier Gm circuit generating circuit is used for converting the voltage of a sampling resistor RSENSE into a sampling current ISENSE to be overlaid with a slope compensation current ISLOPE to be summed to obtain a voltage VS to be used as the same-phase end input of a PWM (pulse width modulator); the output voltage VC in an error amplifier in the circuit serves as the opposite-phase end input of the PWM; the voltage VS and the VC are compared through the PWM to output a pulse control signal PWM. The voltage obtained by sampling is compared with a set current limiting threshold value VR through the COMP comparator to obtain a current limiting signal ILIMIT; and the pulse signal PWM and the current limiting signal ILIMITare subjected to OR gate to obtain a final pulse signal VPWM, and a power tube is controlled to be switched on and off. By adopting the circuit structure disclosed by the invention, the peak value andthe valley value of the inductance current of the four-switch Buck-Boost converter can be sampled and limited, and the circuit structure has the advantages of being high in current sampling precisionand small in area.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an analog integrated circuit, in particular to a current sampling and limiting circuit of a four-switch Buck-Boost converter. Background technique [0002] With the rapid development of semiconductor technology and the continuous development of application fields, maximum power tracking technology is the key technology of micro energy harvesting system. Its main function is to realize the maximum power conversion of energy harvester, which has significant application value. [0003] With the rapid development of electronic technology, there are more and more types of electronic products, and their functions are becoming more and more perfect, which effectively drives the rapid development of DC-DC switching power supplies that provide DC voltage drive for them. The current sampling and limiting technology can detect the current of the power tube, prevent the power tube ...

Claims

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Application Information

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IPC IPC(8): H02M1/32G01R19/00
CPCG01R19/00H02M1/32H02M1/0009H02M1/0038
Inventor 李演明席晓丽文常保王飚雷旭
Owner CHANGAN UNIV
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