Current detection circuit

A technology of current detection circuit and detection resistor, which is applied in electrical components, measurement by digital measurement technology, conversion of AC power input to DC power output, etc., can solve problems such as low signal-to-noise ratio, achieve suppression of common-mode voltage, detection The result is accurate and the effect of avoiding common mode interference

Active Publication Date: 2016-11-16
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this differential detection method often introduces significant common-mode noise comp...

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Embodiment Construction

[0019] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0020] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "an example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in...

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Abstract

The invention discloses a current detection circuit which can be used for detecting a load current of an H bridge circuit. According to the current detection circuit, a positive voltage and a negative voltage of two ends of a detection resistor can be alternately and respectively detected through controlling two amplifiers, the other amplifier works at a zeroing state when one amplifier works in a signal amplification state, a problem of common-mode interference in the prior art can avoided when bidirectional current detection is carried out, and a precise detection current signal can be provided.

Description

technical field [0001] Embodiments of the present invention relate to electronic circuits, and more particularly to current detection circuits for detecting load currents of H-bridge circuits. Background technique [0002] The H-bridge circuit is powered by a single power supply VIN, and is often used to drive a motor or other loads that operate in both directions. figure 1 is a simple schematic diagram of an H-bridge circuit. Such as figure 1 As shown, the switching tubes M1 and M4 form a first switching tube pair, and the switching tubes M2 and M3 form a second switching tube pair. When the switch tubes M1 and M4 are turned on, and the switch tubes M2 and M3 are turned off, the voltage at the terminal A is greater than the voltage at the terminal B, and the forward current flows through the load and runs in a certain direction (for example, clockwise). When the switch tubes M2 and M3 are turned on, and the switch tubes M1 and M4 are turned off, the voltage at terminal B...

Claims

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Application Information

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IPC IPC(8): G01R19/25
CPCG01R19/25H02M7/5387H02M1/0009H02M7/537
Inventor 刘明亮
Owner CHENGDU MONOLITHIC POWER SYST
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