A Programmable Current Detection Circuit

A technology for programming current and detection circuits, which is applied in the direction of measuring current/voltage, measuring devices, and measuring electrical variables, etc. It can solve the problems of increasing system complexity and power consumption, low precision of current detection circuits, and poor adjustability, etc., and achieves good results. Adjustability, save chip area, fast effect

Inactive Publication Date: 2016-07-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, an additional conversion module, an internal reference signal generation module, and an independent signal comparison module are usually required, which increases the complexity and power consumption of the system
Therefore, the traditional current detection circuit has low precision, slow speed, and poor adjustability

Method used

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  • A Programmable Current Detection Circuit
  • A Programmable Current Detection Circuit
  • A Programmable Current Detection Circuit

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Embodiment Construction

[0012] The specific embodiment of the present invention is described below in conjunction with accompanying drawing

[0013] A programmable current detection circuit provided by the present invention, its detailed technical scheme is as follows figure 1 As shown, it includes a current detection unit and a comparator, where the voltage at both ends of the sampling resistor is connected to the input terminal of the current detection unit, the built-in programmable current source provides two programmable currents, and the output of the current detection unit is connected to the input terminal of the comparator. The output terminal of the comparator is the final output of the programmable current detection circuit. Wherein, the comparator is used to further shape the output waveform, and a corresponding comparator circuit can be selected according to actual needs.

[0014] Due to the use of a programmable current source, two currents can be selected by coding, so that different ...

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Abstract

The invention relates to the technical field of electronic circuits, in particular to a programmable current detection circuit. The programmable current detection circuit of the present invention includes a sampling resistor, a current detection unit and a comparator; wherein, the power supply terminal of the current detection unit is connected to the power supply VIN, and its first input terminal is connected to the second input terminal after passing through the sampling resistor, and its first The output terminal is connected to the positive input terminal of the comparator, and the second output terminal is connected to the negative input terminal of the comparator; the output terminal of the comparator is the output terminal of the programmable current detection circuit. The beneficial effect of the present invention is that it is suitable for wide input power supply voltage; it can be applied to the current detection of high-power BUCK converters, the detection accuracy is high, the speed is fast, and the circuit structure is simple, which avoids the need for additional modules. The invention is particularly applicable to programmable current detection circuits.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a programmable current detection circuit. Background technique [0002] With the rapid development of portable digital products, switching power supply chips are widely used. While promoting the development of switching power chip technology, the market also puts forward higher requirements for the performance of switching power chip. Voltage-mode switching power supply chips have basically been eliminated and replaced by current-mode switching power supply chips. This is mainly due to the fact that compared with the voltage mode, the switching power supply chip of the current mode has the advantages of simple compensation network, fast transient response, and easy current protection. Compared with the voltage mode, the current mode switching power supply chip adds an important circuit module - the current detection circuit. In addition, the current det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
Inventor 周泽坤孙亚东石跃董渊赵倬毅王卓张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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