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senses the current flowing through the capacitor

A technology for sensing capacitors and sensing current, which is applied in the direction of only measuring current, measuring current/voltage, components of electrical measuring instruments, etc., and can solve problems such as complex and expensive solutions

Active Publication Date: 2019-11-12
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this solution is expensive and complex
Yet another solution uses capacitors connected to capacitive nodes but offers limited bandwidth and accuracy

Method used

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  • senses the current flowing through the capacitor
  • senses the current flowing through the capacitor
  • senses the current flowing through the capacitor

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Embodiment Construction

[0011] This invention describes a circuit for sensing current in a capacitive network. For example, a series resonant DC-DC converter includes a resonant capacitor coupled (eg, connected) between a first node and ground. The resonant capacitor carries the primary current to be measured. A sensing capacitor is coupled to the resonant capacitor to form a shunt. A sense current flows through the sense capacitor, the sense current being proportional to the primary current through the resonant capacitor. A transimpedance amplifier is coupled to the sense capacitor and produces a voltage output proportional to the sense current flowing through the sense capacitor. In an embodiment, the transimpedance amplifier is implemented using a current feedback amplifier.

[0012] figure 1 is a simplified circuit schematic diagram of the primary side circuit of an isolated power converter illustrating a conventional DC-DC converter 100 . The PWM signal generating stage 101 generates a logi...

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Abstract

In a described example of a method and circuit for sensing current, a first current (I r ) flows through the first capacitor (108). A second capacitor (220) is coupled to the first capacitor (108) to form a shunt. The second current (I s ) flows through the second capacitor (220) and with the first current (I r ) proportional to. A transimpedance amplifier (240) is coupled to the output of the second capacitor (220) and has the same voltage as the second current (I s ) proportional to the voltage output (V O ).

Description

technical field [0001] The present invention relates generally to electronic circuits, and in particular to sensing current flowing through capacitors. Background technique [0002] A DC-DC converter is an electronic circuit that converts DC power from one voltage level to another. DC-DC converters are widely used in portable electronic devices to provide power from batteries or from AC-DC converters, and often in electronic circuits to regulate output voltage. For example, a DC-DC converter can compensate for varying load current and / or changes in input voltage. [0003] Measuring current in a DC-DC converter with minimal power loss and in an inexpensive manner is useful for a variety of control and safety purposes. However, especially in switching mode power converters, such measurements can be difficult or require additional components. [0004] For example, an isolated switched-mode converter, such as an LLC series resonant converter, has an input powered from a high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCH03F3/2173H03F3/45475H03F2200/351H03F2203/45528G01R19/0092H03F2200/129H03F2203/45156H02M1/0009G01R1/30H03F3/04H03F3/45071H03F2203/45022
Inventor 迈克尔·D·塞曼
Owner TEXAS INSTR INC