CN209215478U - Low-cost multi-channel current detection circuit module - Google Patents

Abstract

The utility model discloses a kind of low-cost multi-channel current detection circuit module, including Multi-current Sampling circuit, the signal input part connection corresponding with multidiameter option switch respectively of the sampled signal output end of each current sampling circuit；One signal output channels of multiselect of the multidiameter option switch and the internal A/D converter input terminal of single-chip microcontroller connect, and the single-chip microcontroller realizes communication connection by serial communication interface and host computer.The utility model advantage is that detection range is big, and the linearity, stability are good, and precision is high；Multichannel current signal can be acquired simultaneously, and single-chip microcontroller carries AD quantization, and cost is relatively low.

Description

Low-cost multi-channel current detection circuit module

Technical field

The utility model relates to current detection circuit modules, more particularly, to low-cost multi-channel current detection circuit mould Block.

Background technique

In various instruments such as chemical analyzer operational process, electric current is excessive in order to prevent or mutation causes electrically instrument Damage, needs that current detection module is arranged in current supply circuit, to detect the electric current in instrument current supply circuit.Mesh Before, for the current detection module of above-mentioned instrument current supply circuit, existing deficiency is: 1, sampling resistor electric signal collected compared with It is weak, it is easy to be interfered；2, it is easy the common mode interference by circuit, the linearity is poor；3, original state is uncertain, the linearity compared with Difference；4, sense channel is less.

Summary of the invention

The utility model aim is to provide a kind of low-cost multi-channel current detection circuit module.

To achieve the above object, the utility model takes following technical proposals:

Low-cost multi-channel current detection circuit module described in the utility model, including Multi-current Sampling circuit, often A signal input part corresponding with multidiameter option switch connects the sampled signal output end of a current sampling circuit respectively It connects；One signal output channels of multiselect of the multidiameter option switch and the internal A/D converter input terminal of single-chip microcontroller connect, described Single-chip microcontroller realizes communication connection by serial communication interface and host computer.

Each current sampling circuit is by sampling resistor, the difference amplifier with benchmark, voltage clamp circuit group At；The differential amplifier inputs with benchmark are connect with the sampling resistor, and difference amplifier output end passes through the electricity The signal input part connection corresponding with the multidiameter option switch of flat clamp circuit.

The utility model advantage is that detection range is big, and the linearity, stability are good, and precision is high；Multi-path electricity can be acquired simultaneously Signal is flowed, single-chip microcontroller carries AD quantization, and cost is relatively low.

Detailed description of the invention

Fig. 1 is the schematic block circuit diagram of the utility model.

Specific embodiment

It elaborates with reference to the accompanying drawing to the embodiment of the present invention, the present embodiment before being with technical solution of the present invention It puts and is implemented, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to down State embodiment.

As shown in Figure 1, low-cost multi-channel current detection circuit module described in the utility model, including 16 road electric currents Sample circuit, per current sampling circuit all the way by sampling resistor (2m Ω), the difference amplifier (INA240A1) with benchmark, electricity Flat clamp circuit (clamping level 0-3.3 volt) composition；Differential amplifier inputs with benchmark are connect with sampling resistor, and difference is put Big device output end is connected by a voltage clamp circuit signal input part corresponding with 16 tunnels selection switch (CD4067B)； One signal output channels of multiselect of multidiameter option switch and the internal A/D converter input terminal of single-chip microcontroller (STM32f103C8T6) connect It connects, single-chip microcontroller realizes communication connection by serial communication interface and host computer.

Claims (2)

1. a kind of low-cost multi-channel current detection circuit module, it is characterised in that: including Multi-current Sampling circuit, Mei Gesuo The signal input part connection corresponding with multidiameter option switch respectively of the sampled signal output end for the current sampling circuit stated；Institute The internal A/D converter input terminal of one signal output channels of multiselect and single-chip microcontroller of stating multidiameter option switch connects, the single-chip microcontroller Communication connection is realized by serial communication interface and host computer.

2. low-cost multi-channel current detection circuit module according to claim 1, it is characterised in that: each electricity Stream sample circuit is made of sampling resistor, the difference amplifier with benchmark, voltage clamp circuit；The difference with benchmark is put Big device input terminal is connect with the sampling resistor, and difference amplifier output end is selected by the voltage clamp circuit and the multichannel Select the corresponding signal input part connection of switch.