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High voltage DC non-isolated voltage sampling circuit

A technology of isolating voltage and sampling circuit, applied in the direction of measuring current/voltage, measuring only voltage, measuring electrical variables, etc., it can solve problems such as affecting MCUAD port capture, signal distortion, and inability to truly feedback the real situation of the measured signal, to reduce Uncertain risks, the effect of accelerating development cycles

Active Publication Date: 2021-07-13
佛山市顺德区和而泰电子科技有限公司
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  • Abstract
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Problems solved by technology

In addition, the actual effect of Layout is not ideal, and the high-frequency noise interference can only be filtered out by increasing the capacitance of C2, but it will inevitably lead to other problems, such as: serious delay of sampling signal, signal distortion, and increased phase angle
Simulation results such as image 3 As shown, the common mode noise of SignalGND affects the capture of the real signal at the AD port of the MCU, and it is very serious. It has already seriously affected the sampling end, and it is impossible to truly feedback the real situation of the measured signal.

Method used

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  • High voltage DC non-isolated voltage sampling circuit

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Embodiment Construction

[0020] Embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0021] In view of the fact that common-mode noise has such a large impact, and the length of Signal GND must exist, it is feasible to attenuate the impact of common-mode noise on the MCU AD terminal in the case of long-distance common impedance. Figure 4 The circuit shown is to greatly attenuate the influence of common mode noise in the case of long-distance Signal GND, Figure 4 The circuit corresponds to the simulation model and results such as Figure 5 and Figure 6 shown.

[0022] Figure 5 As shown: the front-end sampling resistors R5 and R6 remain close to the Power GND, while R9, R10, R7, and C4 are close to the MCU AD sampling end. The longest common impedance common-mode noise appears at VRAND2, and the common-mode noise produces interference The signal amplitude is greatly attenuated by R9 and R10. After the attenuation, the common mode noise amp...

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Abstract

The invention discloses a high-voltage DC non-isolated voltage sampling circuit, which introduces a quantity resistance at the sampling end of the MCU AD, greatly reduces the common-mode noise introduced by the sampling signal loop length, and attenuates the common-mode noise amplitude by 10 times from the source, ensuring The MCU AD sampling terminal truly reflects the signal at the sampling terminal, which reduces the uncertain risk of PCB layout engineers on non-isolated common-mode noise processing, speeds up the project development cycle, and ensures that the system control can run stably for a long time.

Description

technical field [0001] The invention relates to the technical field of frequency conversion air conditioners, in particular to a high-voltage DC non-isolated voltage sampling circuit. Background technique [0002] The drive of outdoor controllers and compressors in the inverter air-conditioning industry uses a non-isolated method, which makes it particularly difficult to deal with common-mode noise interference of DC high-voltage sensitive signals. The industry requires engineers to have a clear understanding of noise interference in order to reasonably complete the PCB layout, and structural changes often It will increase the risk points in the design. This design greatly attenuates the influence of noise on the MCU AD sampling port in principle, and the changeable and complex controller structure limit will reduce the influence on the hardware engineer's PCB layout to a controllable range. In this way, project risks can be greatly reduced, as well as project development c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00
CPCG01R19/0084
Inventor 余冠涛
Owner 佛山市顺德区和而泰电子科技有限公司
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