Application of PAS Hall Current Sensor in Photovoltaic Shunt Box

Keywords: Photovoltaic combiner box, Hall current sensor

This article describes the application of the basic Hall principle of the current sensor in the PV combiner box. Given the ubiquitous "bird droppings" effect, the trend of monitoring the power generation of all panels in the front of the combiner box is becoming more and more obvious. Hall current The sensor can perform real-time on-line monitoring of the power generation of each panel or each panel's panel, enabling the staff to deal with the problematic panel in time.

1 Introduction

With the ever-decreasing resources of the planet's exploitable resources and the increase in population, the resource crisis facing humankind has become more and more serious. Under such conditions, the human desire to find new resources is also increasing. Nuclear power, hydropower, thermal power, wind power, Photovoltaic power has been constantly appearing in our field of vision in recent years, providing an endless supply of electric power for our lives. However, current power generation methods have secondary or tertiary pollution, such as nuclear radiation, carbon dioxide, etc. We have to face, in this case, many countries around the world to look into the photovoltaic industry. Photovoltaic (PV) is a valuable and clean resource with small secondary pollution and high utilization rate. However, in view of the environment, climate, and other reasons in the photovoltaic power generation region, current sensors monitor photovoltaic power generation.

2, the principle of current sensors

1) The principle of Hall current sensor

The Hall current sensor is based on the magnetic balance Hall principle, that is, the closed loop principle. When the magnetic flux generated by the primary current IP is concentrated in the magnetic circuit through the high quality magnetic core, the Hall element is fixed in the air gap to detect the magnetic flux, The multi-turn coil on the magnetic core outputs a reverse compensation current for canceling the magnetic flux generated by the primary IP so that the magnetic flux in the magnetic circuit always remains zero. After special circuit processing, the output of the sensor can output current changes that accurately reflect the primary current.

Hall closed-loop current sensor schematic

2) Characteristics of Hall Sensor

Hall sensor whether it is open-loop or closed-loop principle, the basic performance difference is not, the basic advantages are:

1, fast response time

2, low temperature drift

3, high precision

4, small size

5, frequency bandwidth

6, strong anti-interference ability

7, strong overload

Bai Aisi HIA-C01 Series Hall Closed Loop Current Sensor

Bai Aisi HIB-C15 Series Hall Closed Loop Current Sensor

HIA-C01 Series HIB-C15 Series

3, Hall current sensor application

There are many kinds of Hall current sensors manufactured by our company, and the types of sensors used in the photovoltaic industry are also inconsistent. There are basically two types of Hall current sensors based on the closed loop principle of HIA-C01 and HIB-C15. The basic application method is HIA-C01. The Hall current sensor detects the power generation status of each panel at the front end, and outputs signals to the signal acquisition device. The signal acquisition device undergoes the steps of acquisition, signal conversion, and the like, and the cable is transmitted to the control center. The control center uniformly performs power generation for each array. Monitoring, as shown below:

Bosch Hall closed-loop current sensor application block diagram

4, Hall current sensor needs to pay attention to when selecting and using:

1) Current sensor selection problem:

A. When selecting the current sensor, pay attention to whether the perforation size can ensure that the wire can pass through the sensor;

B. When selecting a current sensor, it is necessary to pay attention to whether there is a special environment such as high temperature, low temperature, high humidity, strong earthquake, etc. in the application environment of the site;

C. When selecting a current sensor, pay attention to whether the space structure is satisfied;

2) Use of current sensor:

A. When wiring, pay attention to the bare conductive part of the terminal block and try to prevent ESD impact. Engineers with professional construction experience are required to perform wiring operation on this product. The connection wires of the power supply, input, and output must be connected correctly. They must not be misplaced or reversed. Otherwise, the product may be damaged.

B, product installation environment should be non-conductive dust, corrosive

C. Severe vibration or high temperature may also cause damage to the product. Care must be taken when using it.

5. Concluding remarks

With the development of society, energy saving and emission reduction is the focus of current development, and unified monitoring of equipment in various industries, reducing personnel costs, wasting power, extending the service life of equipment, etc. Traditional current transformers, shunts and other products can no longer Responsible for more work, under this condition, the Hall current sensor can make more industry equipment work under monitoring, reduce the input costs of personnel and equipment maintenance, and more detailed information please consult

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