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Analog buffer, voltage measuring circuit and electric energy metering chip

A buffer and amplifying circuit technology, which is applied in the direction of measuring electrical variables, measuring electricity, and components of electrical measuring instruments, etc., can solve the problems of high input impedance of analog buffers, inability to take into account the linearity of common mode rejection performance, etc. Effects of Common Mode Rejection Requirements

Pending Publication Date: 2019-09-10
SHENZHEN RENERGY TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of this application is to provide an analog buffer, a detection circuit for voltage divider circuit parameters, and an electric energy metering chip, aiming to solve the problems of traditional analog buffers that cannot balance high input impedance, common-mode rejection performance, and linearity

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  • Analog buffer, voltage measuring circuit and electric energy metering chip
  • Analog buffer, voltage measuring circuit and electric energy metering chip
  • Analog buffer, voltage measuring circuit and electric energy metering chip

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Embodiment Construction

[0017] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0018] It should be noted that when an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present application, "pl...

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Abstract

An analog buffer is divided into two stages, the first stage is two pairs of input differential amplifiers, the second stage is an amplifier, and output of the second stage can be fed back to the input end of one pair of differential amplifiers in the first stage to form the analog buffer. According to the analog buffer, a common-mode part in an input signal can be eliminated, so that the analog buffer outputs an unsaturated input common-mode signal, and the common-mode rejection requirement of a subsequent circuit of the analog buffer is reduced; and meanwhile, the analog buffer can ensure that the output signal is an input differential signal, so that the analog buffer is prevented from being saturated when the input differential signal is a strong differential signal, and the requirement of the application on the linearity of the analog buffer is met.

Description

technical field [0001] The application belongs to the technical field of electronic circuits, and in particular relates to an analog buffer, a voltage measurement circuit and an electric energy measurement chip. Background technique [0002] The energy meter with accurate automatic fault detection is an important part of the intelligent electric energy metering system. At present, in the voltage measurement circuit with fault detection, the voltage to be measured is generally attenuated to the input of the ADC (analog-to-digital converter) through the sampling network. Within the voltage safety range, the digital output converted by the ADC enters the digital processing unit for voltage amplitude and phase processing; at the same time, the special detection signal is sent to the ADC after passing through the sampling network, and the digital output converted by the ADC enters the digital processing unit for processing. For the processing of voltage amplitude and phase, by ob...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/32H03F3/45H03F3/68H03F1/56G01R1/30
CPCH03F1/3211H03F1/3205H03F3/45479H03F3/45179H03F3/68H03F1/56G01R1/30
Inventor 刘凯陈世超许建超夏书香
Owner SHENZHEN RENERGY TECH
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