Ultra-low power high-speed current sampling circuit

A current sampling, ultra-low power consumption technology, applied in the direction of reducing power consumption, logic circuits with logic functions, circuits, etc., can solve the problems of lack of integration, difficult matching of time constants of two branches, etc. state response, accelerated settling time, and low power consumption

Active Publication Date: 2019-09-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF5 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this implementation method, the time constant of the RC branch is closely related to the inductance, capacitance, and resistan...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ultra-low power high-speed current sampling circuit
  • Ultra-low power high-speed current sampling circuit
  • Ultra-low power high-speed current sampling circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0044] The topological structure diagram of the current sampling circuit proposed by the present invention is as follows figure 1 As shown, it includes a sampling module and an auxiliary clamping module. The sampling module includes an operational amplifier and a first NMOS transistor NM1. The gate of the first NMOS transistor NM1 is connected to the gate of the power transistor in the switching power supply, and its drain is connected to the power transistor. The drain of the operational amplifier is connected to the power supply voltage, and its source is connected to the negative input terminal of the operational amplifier; the positive input terminal of the operational amplifier is connected to the source of the power tube, and the output voltage of the operational amplifier returns to the negative input terminal of the operational amplifie...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

An ultra-low power high-speed current sampling circuit belongs to the technical field of power management circuits. The current sampling circuit comprises a sampling module and an auxiliary clamping module, wherein the sampling module comprises an operational amplifier and a first NMOS transistor, the gate of the first NMOS transistor is connected to the gate of a power tube, the drain thereof is connected to the drain of the power tube and connected to the power supply voltage, and the source thereof is connected to the negative input terminal of the operational amplifier; the positive input terminal of the operational amplifier is connected to the source of the power tube, and the voltage of the output terminal of the operational amplifier returns to the negative input terminal of the operational amplifier through a feedback loop; the auxiliary clamp module sets upper and lower limits for the output voltage of the operational amplifier, the voltage clamp is used to accelerate the transient process from the disabled state to the enabled state, and an ultra-low power current sampling circuit with fast response speed is realized combined with the wide bandwidth. The invention also proposes an operational amplifier with a wide bandwidth to further accelerate the transient response of the current sampling circuit.

Description

technical field [0001] The invention belongs to the technical field of power management circuits, and in particular relates to a high-speed current sampling circuit with ultra-low power consumption. Background technique [0002] In the field of power management circuits, the current sampling circuit is a very important part. For switching power supplies, how to accurately and real-time collect the current information on the inductor for system control has become a key technology. The current sampling circuit judges whether the system is in an overcurrent state by sampling the inductor current information, which can prevent damage to the switching power supply in the event of overcurrent or short circuit. Secondly, current sampling, as a necessary technology in the current mode control mode, can control the stability of the loop and improve the response speed of the loop. Improving the accuracy and speed of current sampling and reducing the delay of sampling modules to ensu...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01R1/30H03K17/042H03K17/687H03K19/00H03K19/017H03K19/20H03K3/037H03F3/42
CPCG01R1/30H03F3/423H03K3/0377H03K17/04206H03K17/6871H03K19/0013H03K19/0016H03K19/017H03K19/20
Inventor 周泽坤王佳文金正扬王韵坤张波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap