Isolation type photovoltaic cell electric quantity information acquisition device

Abstract

The utility model provides an isolated photovoltaic cell electric quantity information acquisition device, which comprises eight single crystal cell panels, the outer ends of the eight single crystal cell panels are electrically connected with eight external ADC chips, the outer ends of the eight external ADC chips are connected with 16 optical couplers, the outer ends of the 16 optical couplers are provided with two single-pole analog switch chips, and the single-pole analog switch chips are electrically connected with the single crystal cell panels. Wherein the outer end of one single-pole analog switch chip is connected with a minimum MCU system module, the outer end of the other single-pole analog switch chip is connected with eight paths of rectification and voltage stabilization modules, and the outer end of the minimum MCU system module is connected with a path of USB to serial port chip. According to the invention, the problem that the working voltage of each photovoltaic cell panel is difficult to measure by using a conventional method because high voltage exists in the whole photovoltaic cell panel area in the case of normal illumination in the design of cell panel information acquisition is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery panel information acquisition, and more specifically, to an isolated photovoltaic battery power information acquisition device. Background Technique

[0002] An isolated photovoltaic battery power information acquisition device is a device designed specifically for solar panels. Its main function is to monitor and collect the power information of the panels in real time, including key parameters such as voltage, current, and power. This device usually uses a high-precision analog-to-digital converter (ADC) to ensure data accuracy and adopts isolation technology to improve system safety, preventing electrical noise and faults from spreading to other parts of the system.

[0003] In a photovoltaic inverter station, monocrystalline silicon or polycrystalline silicon battery panels are usually used. Multiple panels are connected in series to form a group, and multiple photovoltaic battery groups are then connected in parallel and connected to a photovoltaic inverter. Together with other accessories, they form an inverter system. Usually, the photovoltaic inverter will collect the voltage and current of the input photovoltaic battery group to calculate the MPP maximum power point tracking. Usually, for the aging of photovoltaic batteries, the photovoltaic inverter can only calculate the information of each group. For the aging of a single battery panel, it can only be estimated and cannot screen out a specific one.

[0004] Currently, the commonly used photovoltaic battery panel has a length of 2172 mm × a width of 1303 mm × a thickness of 40 mm. When under STC, the open-circuit voltage is below 56V. The highest voltage of the entire series-connected photovoltaic battery assembly is about 1500V, and the normal working voltage is also about 850V. Under normal lighting conditions, high voltage exists throughout the area of the entire photovoltaic battery panel. It is very difficult to measure the working voltage of each photovoltaic battery panel using conventional methods. Therefore, we make improvements and propose an isolated photovoltaic battery power information acquisition device. Content of the Utility Model

[0005] The purpose of the present utility model is to address the problem that under normal lighting conditions, high voltage exists throughout the area of the entire photovoltaic battery panel, and it is very difficult to measure the working voltage of each photovoltaic battery panel using conventional methods in the current design of battery panel information acquisition.

[0006] To achieve the above-mentioned utility model purpose, the present utility model provides the following technical solutions:

[0007] An isolated photovoltaic battery power information acquisition device to improve the above problems.

[0008] Specifically, this application is as follows:

[0009] Isolated photovoltaic cell power information acquisition device, including 8 single-crystal cell panels. The outer ends of the 8 single-crystal cell panels are electrically connected to 8 external ADC chips. The outer ends of the 8 external ADC chips are connected to 16 optocoupler devices. There are two single-pole analog switch chips at the outer ends of the 16 optocoupler devices. One of the single-pole analog switch chips is externally connected to a minimum MCU system module, and the other single-pole analog switch chip is externally connected to an 8-channel rectification and voltage stabilization module. The outer end of the minimum MCU system module is connected to a USB-to-serial port chip.

[0010] As a preferred technical solution of this application, it further includes: a flyback switching power supply package. The positive output terminal of the flyback switching power supply package is connected to one of the external ADC chips. The positive input terminal of the flyback switching power supply package is connected to the 8 single-crystal cell panels. The negative terminal of the flyback switching power supply package is connected to one of the external ADC chips.

[0011] As a preferred technical solution of this application, the outer ends of the 8 external ADC chips are connected to an 8-channel rectification and voltage stabilization module.

[0012] As a preferred technical solution of this application, the 8 single-crystal cell panels are electrically connected to each other.

[0013] As a preferred technical solution of this application, the 8 external ADC chips are respectively electrically connected to one end of the 16 optocoupler devices, and the other ends of the 6 optocoupler devices are respectively electrically connected between the two single-pole analog switch chips.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] In the solution of this application:

[0016] This device adopts isolation technology and an 8-channel non-ground-supplying method to collect the voltage, current, and output power of each photovoltaic cell panel during operation. The working information of each photovoltaic cell is output through the USB interface of this device and can work normally when stacked to 1500V. During operation, the output terminal is not rigidly connected to the entire photovoltaic inverter system, and it is harmless to the human body. Under the same lighting conditions, through the collected information output by this device, it is easy to distinguish the abnormal and aging conditions of a certain photovoltaic panel cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall component structure distribution diagram of the isolated photovoltaic cell power information acquisition device provided by this application;

[0018] Figure 2 It is the flyback switching power supply circuit distribution diagram of the isolated photovoltaic cell power information acquisition device provided by this application;

[0019] Figure 3Opto-coupler device communication circuit diagram of the isolated photovoltaic cell power information acquisition device provided by this application;

[0020] Figure 4 External ADC chip circuit diagram of the isolated photovoltaic cell power information acquisition device provided by this application;

[0021] Figure 5 Single-pole analog switch chip circuit diagram of the isolated photovoltaic cell power information acquisition device provided by this application;

[0022] Figure 6 USB to serial port chip circuit diagram of the isolated photovoltaic cell power information acquisition device provided by this application;

[0023] Figure 7 Circuit principle of the isolated photovoltaic cell power information acquisition device provided by this application Figure 1 ;

[0024] Figure 8 Circuit principle of the isolated photovoltaic cell power information acquisition device provided by this application Figure 2 ;

[0025] Figure 9 Circuit principle of the isolated photovoltaic cell power information acquisition device provided by this application Figure 3 ;

[0026] Figure 10 Circuit principle of the isolated photovoltaic cell power information acquisition device provided by this application Figure 4 ;

[0027] Figure 11 Circuit principle of the isolated photovoltaic cell power information acquisition device provided by this application Figure 5 ;

[0028] Figure 12 Circuit principle of the isolated photovoltaic cell power information acquisition device provided by this application Figure 6 . Detailed implementation manners

[0029] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model.

[0030] Accordingly, the following detailed description of the embodiments of the present utility model is not intended to limit the scope of the claimed present utility model, but merely represents some embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model. It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments may be combined with each other.

[0031] It should be noted that like reference numerals and letters denote like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] As Figures 1-12 shown, the present embodiment provides an isolated photovoltaic cell power information acquisition device, which includes 8 single crystal cell panels. The outer ends of the 8 single crystal cell panels are electrically connected to 8 external ADC chips. The outer ends of the 8 external ADC chips are connected to 16 optocoupler devices. Two single-pole analog switch chips are provided at the outer ends of the 16 optocoupler devices. The outer end of one of the single-pole analog switch chips is connected to a minimum MCU system module, and the outer end of the other single-pole analog switch chip is connected to an 8-channel rectification and voltage stabilization module. The outer end of the minimum MCU system module is connected to a USB to serial port chip.

[0033] As a preferred technical solution of the present application, it further includes: a flyback switch power supply package. The positive output end of the flyback switch power supply package is connected to one of the external ADC chips. The positive input end of the flyback switch power supply package is connected to the 8 single crystal cell panels. The negative end of the flyback switch power supply package is connected to one of the external ADC chips.

[0034] As a preferred technical solution of the present application, the outer ends of the 8 external ADC chips are connected to the 8-channel rectification and voltage stabilization module.

[0035] As a preferred technical solution of the present application, the 8 single crystal cell panels are electrically connected to each other through electrical signals.

[0036] As a preferred technical solution of the present application, the 8 external ADC chips are respectively electrically connected to one end of the 16 optocoupler devices, and the other ends of the 6 optocoupler devices are respectively electrically connected between the two single-pole analog switch chips.

[0037] As Figure 2As shown, as a preferred embodiment, on the basis of the above method, further, all components of this device are provided by a flyback switching power supply. The Flyback topology circuit is adopted, and the power is taken from the positive and negative poles of an 8-series single-crystal battery panel. Similar to the flyback switching power supplies on the market, one path of this flyback power supply provides power for the MCU, and another 8 paths of power are provided to supply power to the external ADC chips. Since these 8 paths of power are the 8 windings of the transformer and there is no grounding behavior, it is equivalent to that each of the 8 ADC chips is on a virtual ground plane alone. The superposition of the single-crystal battery panel voltages will not affect the ADC input sampling circuit, and it can work reliably and normally.

[0038] As Figure 3 shown, as a preferred embodiment, on the basis of the above method, further, the external ADC chip and the MCU of this device are independent of each other, there is no loop in between, and an optocoupler device is used during communication. The two use serial communication. The urat tx of the MCU is connected to the urat rx of the external ADC, and the urat rx of the MCU is connected to the urat tx of the external ADC. Usually, the MCU sends instructions to the external ADC chip, and the external ADC chip starts to convert the input signal, and sends the converted result to the receiving end of the MCU through the optocoupler;

[0039] The input circuit of the external ADC uses resistor voltage division. The voltage division circuit reduces the input voltage from 0 to 50V by 100 times and sends it to the external ADC for analog-to-digital conversion.

[0040] As Figure 4 shown, as a preferred embodiment, on the basis of the above method, further, this device has a total of 8 voltage sampling circuits, and the circuits of each path are the same. Since serial communication is used, the MCU cannot communicate with 8 external ADCs simultaneously, but communicates with the external ADCs alternately in sequence. This device adds two analog switches. The analog switch is a single-pole 8-channel one, and only one path can be kept conducting during normal operation. One analog switch is connected to the serial port sending end of the MCU, and one is connected to the serial port receiving end of the MCU. The MCU is connected to the control port of the analog switch with 3 GPIO, and the 3 GPIO increase in sequence from 0x00 to 0x07 and can be switched to the corresponding channel number. When the MCU wants to communicate with the external ADC chip, it only needs to configure the values of the 3 GPIO to communicate with the corresponding external ADC.

[0041] As Figure 5 shown, as a preferred embodiment, on the basis of the above method, further, the MCU is externally connected with a USB-to-serial chip. This circuit is mainly for the MCU to communicate with the host computer and transmit the data output by the MCU to the host computer.

[0042] As a preferred embodiment, on the basis of the above method, further, the device also reserves a debugging interface to facilitate software development work in the later stage.

[0043] When this application is in use: The isolation technology is adopted, and the 8-channel non-grounded method is used to collect the voltage, current and output power of each photovoltaic panel during operation. The working information of each photovoltaic cell is output through the USB interface of this device, and it can work normally when stacked to 1500V. When working, the output end is not rigidly connected to the entire photovoltaic inverter system and is harmless to the human body. Under the same light conditions, through the collected information output by this device, it is easy to distinguish the abnormal and aging conditions of a certain photovoltaic panel battery.

[0044] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. Although this specification has described the present invention in detail with reference to the above respective embodiments, the present invention is not limited to the above specific embodiments. Therefore, any modification or equivalent replacement of the present invention; and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention are covered by the scope of the claims of the present invention.

Claims

1. An isolated photovoltaic battery power information collection device, comprising 8-way monocrystalline battery panels, characterized in that: The outer end of the 8-way monocrystalline solar panel is electrically connected to an 8-way external ADC chip, the outer end of the 8-way external ADC chip is connected to a 16-way optocoupler device, and the outer end of the 16-way optocoupler device is provided with two single-pole analog switch chips, one of which is connected to a minimum MCU system module at the outer end, and the other is connected to an 8-way rectification and voltage stabilization module at the outer end, and the outer end of the minimum MCU system module is connected to a USB to serial port chip.

2. The isolated photovoltaic battery power information collection device according to claim 1, characterized in that: Also includes: A flyback switching power supply pack, wherein the positive output end of the flyback switching power supply pack is connected to one of the external ADC chips, the positive input end of the flyback switching power supply pack is connected to 8 single crystal battery panels, and the negative end of the flyback switching power supply pack is connected to one of the external ADC chips.

3. The isolated photovoltaic battery power information collection device according to claim 1, characterized in that: The external ends of the 8-way external ADC chips are connected to the 8-way rectification and voltage regulation modules.

4. The isolated photovoltaic battery power information collection device according to claim 1, characterized in that: The 8 monocrystalline solar panels are connected via electrical signals.

5. The isolated photovoltaic battery power information collection device according to claim 1, characterized in that: The 8-way external ADC chips are electrically connected to one end of the 16-way optocoupler devices respectively, and the other ends of the 6-way optocoupler devices are electrically connected to two single-pole analog switch chips respectively.

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