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Sampling circuit with adjustable precision, and measuring device

A sampling circuit and precision technology, applied in the field of circuits, can solve the problems of small application range of the sampling circuit, and achieve the effect of wide sampling range and improved safety.

Pending Publication Date: 2019-03-29
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a sampling circuit and measuring equipment with adjustable precision in order to solve the technical problem that the application range of the sampling circuit in the prior art is small

Method used

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  • Sampling circuit with adjustable precision, and measuring device
  • Sampling circuit with adjustable precision, and measuring device
  • Sampling circuit with adjustable precision, and measuring device

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Embodiment Construction

[0022] like figure 1 As shown, in the embodiment of the present invention, a sampling circuit with adjustable precision is provided, which includes a resistor divider circuit 1 , a programmable amplifier 2 , a programmable attenuator 3 , an analog switch 4 , a voltage follower 5 and an MCU 6 . The details are described below respectively.

[0023] like figure 2 As shown, in the embodiment of the present invention, the resistor divider circuit 1 adopts a typical resistor divider circuit, which includes a resistor R1 and a resistor R2, one end of the resistor R1 receives the sampling signal, and the other end is connected to one end of the resistor R2 , the other end of the resistor R2 is grounded, and the connecting ends of the resistor R1 and the resistor R2 are respectively connected to the programmable amplifier and the programmable attenuator. When the signal to be sampled is a voltage signal, the resistor divider circuit 1 is used to divide the voltage signal to be samp...

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Abstract

The invention discloses a sampling circuit with adjustable precision. The sampling circuit comprises a programmable amplifier, a programmable attenuator and an MCU, wherein the programmable amplifieris used for amplifying a to-be-sampled electric signal; the programmable attenuator is used for attenuating the to-be-sampled electric signal; and the MCU is used for selecting the programmable amplifier and the programmable attenuator and controlling an amplification factor of the programmable amplifier or an attenuation factor of the programmable attenuator. The sampling circuit has the advantages of being adjustable in precision and wide in sampling range. The invention further discloses a measuring device adopting the sampling circuit.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a sampling circuit with adjustable precision and a measuring device using the sampling circuit. Background technique [0002] In the industrial field, it is often necessary to collect DC quantities such as DC voltage and DC current in order to control the control object. In the existing technology, generally the direct current flow is directly connected to the sampling circuit for measurement. For a relatively complex sampling environment, the DC value to be measured may be large or small, and the sampling accuracy of the sampling circuit cannot be adjusted, resulting in a too small application range. Contents of the invention [0003] The object of the present invention is to provide a sampling circuit and measuring equipment with adjustable precision to solve the technical problem that the sampling circuit in the prior art has a small application range. [0004] In the embodiment of...

Claims

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Application Information

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IPC IPC(8): G01R31/28
CPCG01R31/28
Inventor 滕晓伟叶王建廖冠尧任鹏
Owner GREE ELECTRIC APPLIANCES INC
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