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Current sampling circuit

A current sampling and circuit technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problems such as the large influence of the current sampling circuit, and achieve the effect of eliminating high-order harmonics

Pending Publication Date: 2018-01-16
ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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Problems solved by technology

[0004] The main purpose of the present invention is to provide a current sampling circuit to solve the problem that the current sampling circuit is greatly affected by high-order harmonics in the related art

Method used

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Embodiment Construction

[0018] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0019] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0020] It should be noted that the terms "first...

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Abstract

The present invention discloses a current sampling circuit. The circuit comprises an RC filtering circuit and an amplification circuit; the input end of the RC filtering circuit receives current sampling signals and are used for filtering the current sampling signals; and the input end of the amplification circuit is connected with the output end of the RC filtering circuit and is used for amplifying the current sampling signals filtered by the RC filtering circuit and transmitting the amplified current sampling signals to a sampler. According to the current sampling circuit of the invention,the RC filtering circuit and the amplification circuit are adopted, and therefore, the problem that a current sampling circuit in the prior art is greatly affected by higher harmonics can be solved.

Description

technical field [0001] The present invention relates to the technical field of current sampling circuits, in particular to a current sampling circuit. Background technique [0002] One of the sources of the high-order harmonics of the motor current is the frequent switching of the IPM. The magnitude of the high-order harmonic components of the motor current will affect the size of the torque ripple of the motor. If the high-order harmonic components are small, the torque ripple of the motor will be small, and vice versa. The same is true. Since the motor current is an important position estimation parameter, it requires high real-time performance, so in the existing motor current sampling circuit, if a filtering link is added before the operational amplifier, the current will be delayed, and the amplification factor of the operational amplifier will not be able to Therefore, even if the delay compensation is added to the software, the hardware will cause a certain degree of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 邓险峰敖文彬姚丽娜
Owner ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION
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