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High-side current detection circuit

A current detection circuit, high-end technology, applied in the direction of measuring current/voltage, logic circuit connection/interface layout, electrical components, etc., can solve the problems of low precision and slow speed of high-end current detection, and achieve fast response and high precision Effect

Active Publication Date: 2010-03-10
MAXIC TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of low precision and slow speed in high-side current detection, thereby providing a fast and high-precision high-side current detection circuit

Method used

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Examples

Experimental program
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Embodiment Construction

[0019] Figure 4 is a circuit diagram of a high-side current detection circuit of an embodiment of the present invention, which can be used as figure 1 The current detection circuit in.

[0020] like Figure 4 As shown, the transistor M0 is a high-end NMOS transistor. The drain of M0 is connected to the voltage input terminal VIN, and the source is connected to one end of the inductor L0; the other end of the inductor L0 provides the load with an output voltage Vout. Capacitor C0 provides AC filtering for the load.

[0021] In order to detect the current flowing through the drain-source of the transistor M0, the high-side current detection circuit mainly includes two parts, a voltage-current conversion circuit and a clamping circuit.

[0022] The voltage-current conversion circuit includes transistors M3, M4 and M5, and current sources I1 and I2. M3 and M4 together with current sources I1 and I2 form an operational amplifier. The positive input terminal of the operationa...

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Abstract

The invention provides a high-side current detection circuit which is used for detecting current flowing through a transistor to be detected. The detection circuit works under a first state of detecting the current and a second state of not detecting the current, and comprises a voltage following circuit, a voltage-current converting circuit and a clamping circuit, wherein the voltage following circuit enables a first point voltage under the first state to change along with a second point voltage, and the second point voltage reflects the current flowing through the transistor to be detected;the voltage-current converting circuit is used for converting the first point voltage into current and outputting the current; and the clamping circuit is used for clamping the first point voltage toa voltage higher than earth potential under the second state. The high-side current detection circuit can be used for monitoring high-side NMOS current, and has high precision and high reaction speed.

Description

technical field [0001] The invention relates to a high-side current detection circuit. Background technique [0002] Current measurement technology has a very wide range of applications, and many systems need to detect the magnitude of the inflow and outflow current. For example, current protection / current monitoring devices, 4-20mA current loop systems, programmable current sources, linear / switch mode power supplies, and chargers or battery gas gauges that need to know the ratio of incoming and outgoing current. Since many applications are portable, the current-sensing circuit must also be small and consume low power. [0003] figure 1 It is a schematic diagram of the application of the high-end NMOS current detection circuit in the step-down conversion circuit (Buck circuit). The Buck circuit is divided into two working states. In the first state, the NMOS tube M0 is turned on, and the inductor current rises with a certain slope. At this time, the current detection circ...

Claims

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Application Information

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IPC IPC(8): G01R19/00H02M3/00H03K19/0175H03F3/343
Inventor 景卫兵刘柳胜郑儒富
Owner MAXIC TECHNOLOGY CORPORATION