Universal application circuit for three-phase, two-phase and single-phase resistance sampling and method

Abstract

The invention discloses a universal application circuit for three-phase, two-phase and single-phase resistance sampling and a method. The circuit comprises a rectifier bridge which is used for converting an input alternating current into a pulsating direct current, a filtering voltage stabilizing circuit which is used for filtering the direct current and stabilizing the bus voltage of the direct current, an inverter circuit which is used for converting the direct current into alternating current; a sampling circuit which is used for sampling the alternating current; and a sampling amplification circuit which is used for amplifying the voltage obtained by sampling. A universal adaptive structure is adopted in hardware, a user can conveniently switch a three-resistor system, a two-resistor system and a single-resistor system, a PCB does not need to be changed any more; a larger selection space is provided for cost and efficiency under different occasion application conditions; users withdifferent requirements are better met. The circuit and method are more flexible and applicable, and can be widely applied to the technical field of resistance sampling detection.

Description

technical field [0001] The invention relates to the technical field of resistance sampling and detection, in particular to a general application circuit and method for three-phase, two-phase and single-phase resistance sampling. Background technique [0002] Existing patents (such as patent numbers CN201820032656.5, CN201610776444.3 or CN201821788055.3, etc.) have described single-resistance and dual-resistance sampling systems. These hardwares are only used in one way and cannot be used universally. Usually, the sampling efficiency of three resistors is high, and the requirements for algorithms are low, but the cost is slightly higher; the sampling efficiency of single resistors is low, the requirements for algorithms are high, and the current needs to be reconstructed, but the cost is optimal; and the two resistors are in between. Manufacturers usually need to make comprehensive selection among them and update and upgrade products, so they generally hope that the hardware ...

AI Technical Summary

Problems solved by technology

[0002] Existing patents (such as patent No. CN201820032656.5, CN201610776444.3 or CN201821788055.3, etc.) have described single-resistance and dual-resistance sampling systems. These hardware are all used in one way alone and cannot be used universally.

Generally, the sampling efficiency of three resistors is high, and the requirements for the algorithm are low, but the cost is slightly higher; the sampling efficiency of the single resistor is low, the requirements for the algorithm are high, and the current needs to be reconstructed, but the cost is optimal; and the two resistors are in between.

Manufacturers usually need to make comprehensive selection among them and update and upgrade products, so they generally hope that the hardware can be compatible, so that they can quickly debug and upgrade the software without changing the hardware; When manufacturers want to be compatible with these three application circuits, they need to change the hardware and re-layout the PCB, which not only affects the production time, but also increases the cost.

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