CN206311944U - It is switched fast load device and photovoltaic energy storage device - Google Patents

Abstract

The utility model provides a photovoltaic energy storage device, which includes a display module, a communication control module, a battery management system, a grid-connected output terminal and an off-grid output terminal of a photovoltaic inverter, a battery, and a battery directly connected in series to the off-grid output terminal. A fast switching load device between external loads. The fast switching load device includes a single-chip microcomputer, a display electrically connected to the single-chip microcomputer, and a working power supply for the display and the single-chip microcomputer. The fast switching load device is also provided with a signal conversion module electrically connected with the single chip electromechanical device and an AC solid state relay electrically connected with the signal conversion module, and the driving signal transmitted by the signal conversion module controls the AC solid state relay on and off states. Such a setting realizes the purpose of quickly switching loads by setting the switching time interval according to the requirement to automatically switch the load, meets the requirements of automatic testing, saves labor costs, and controls the switching time interval accurately.

Description

Fast switching load device and photovoltaic energy storage device

technical field

The utility model relates to the photovoltaic industry, in particular to a fast switching load device and a photovoltaic energy storage device for automatically switching loads by setting a switching time interval according to requirements.

Background technique

At present, the aggravation of the energy crisis and the pollution of the environment by fossils are prompting the rapid progress of new energy technologies. Photovoltaic power generation has been more and more widely used and promoted due to its advantages of large reserves and no pollution. Photovoltaic energy storage system integrates inverter, step-up and energy storage, which is easy to install and use, and has good commercial prospects.

The photovoltaic energy storage system is mainly used to convert the direct current generated by photovoltaic modules into usable alternating current, which can be used by off-grid loads, and can also store the excess electric energy generated in the battery, and transmit it to the grid during peak power consumption Alleviate the pressure of electricity consumption and generate economic benefits.

Photovoltaic energy storage systems generally include display modules, communication control modules, battery management systems, photovoltaic inverters and batteries. The display module is mainly used to display the operating status of the entire energy storage system, the communication control module is mainly used to coordinate the operation of each functional module in the system, and the battery management system is mainly used for battery management. Photovoltaic inverters have the functions of grid-connected and off-grid output, which can not only output the generated electric energy on the grid, but also supply power to off-grid loads.

When used off-grid, the load will switch frequently. For example, in the household environment, the photovoltaic inverter is required to have strong load impact resistance to ensure that the photovoltaic inverter can work stably and reliably in the application environment with frequent current switching. The usual way of carrying out the load shock resistance test is to cut off the output switch directly when the system is working at full load, then immediately restore the output, and perform the operation of cutting off and then restoring repeatedly.

In the reliability testing and failure analysis of photovoltaic energy storage systems, frequent load switching tests are often required to verify the system's ability to withstand load shocks. The conventional method is to manually close and disconnect the load switch repeatedly, because the test time is usually long. It takes manpower, and the switching interval cannot be accurately controlled.

In view of this, it is necessary to design an improved fast switching load device and photovoltaic energy storage device to solve the above problems.

Utility model content

The purpose of the utility model is to provide a fast switching load device and a photovoltaic energy storage device that can automatically switch loads by setting the switching time interval according to requirements.

In order to achieve the above object, the utility model provides a fast switching load device, including a single-chip microcomputer, a display electrically connected to the single-chip electromechanical device, and a working power supply for the display and the single-chip microcomputer. The fast switching load device also A signal conversion module electrically connected to the single-chip electromechanical device and an AC solid state relay electrically connected to the signal conversion module are provided, and the driving signal transmitted by the signal conversion module controls the on and off states of the AC solid state relay .

As a further improvement of the utility model, the signal conversion module is a circuit system composed of several transistors and resistance elements.

As a further improvement of the present invention, the signal conversion module further includes a 12V switching power supply, and the output of the 12V switching power supply is controlled by the signal conversion module.

As a further improvement of the present invention, the driving signal is a control signal amplified by the 12V switching power supply through the signal conversion module.

As a further improvement of the utility model, the model of the single-chip microcomputer is STC12C5A60S2, and the single-chip microcomputer communicates, sends and receives instructions with the display and the signal conversion module.

As a further improvement of the utility model, the single-chip microcomputer outputs a control signal for switching between high and low levels to the signal conversion module.

As a further improvement of the utility model, the time interval for switching between high and low levels of the output control signal of the single-chip microcomputer is controlled by setting parameters of the display.

As a further improvement of the utility model, the display uses a 1602 display screen to display the feedback information of the operating state of the single-chip microcomputer.

As a further improvement of the utility model, the working power supply is a 5V switching power supply.

The utility model also provides a photovoltaic energy storage device, including a display module, a communication control module, a battery management system, a photovoltaic inverter and a storage battery. The photovoltaic inverter has a grid-connected output terminal and an off-grid output terminal. The photovoltaic energy storage device also includes the fast switching load device described in any one of the above technical solutions that is directly connected in series between the off-grid output terminal and the external load.

Compared with the prior art, the utility model quickly switches the load device and the photovoltaic energy storage device by adding a signal conversion module and an AC solid-state relay connected to the signal conversion module in the device, so that the switching time interval can be set according to the demand. The purpose of fast switching loads of automatic load switching meets the requirements of automatic testing, is convenient to operate, saves labor costs, and controls the switching time interval accurately.

Description of drawings

FIG. 1 is a schematic diagram of a simple circuit of a fast switching load device of the present invention.

Fig. 2 is a schematic diagram of a simple structure of a photovoltaic energy storage device of the present invention.

detailed description

In order to make the purpose, technical solution, and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

Please refer to FIG. 1 , which is a fast switching load device 100 disclosed by the utility model. The fast switching load device 100 includes a single-chip microcomputer 1, a display 2 electrically connected to the single-chip microcomputer 1, and an electrical connection with the single-chip microcomputer 1. The signal conversion module 3 that is electrically connected, the AC solid state relay 4 that is electrically connected with the signal conversion module 3, and the 5V working power supply 5 that supplies power to the single-chip microcomputer 1 and the display 2.

The model of the single-chip microcomputer 1 is STC12C5A60S2, and the single-chip microcomputer 1 communicates, sends and receives instructions with the display 2 and the signal conversion module 3 .

The display 2 is a 1602 display screen. By inputting a specific set value in the display screen 2, that is, the time interval for switching between high and low levels, the set value is written into the single-chip microcomputer 1 to control the single-chip microcomputer. 1 The time interval for outputting the high and low level switching of the control signal. At the same time, the display screen 2 displays the feedback information of the operating state of the single-chip microcomputer 1 .

The signal conversion module 3 is a circuit system composed of several transistors (not shown), several resistive elements (not shown) and a 12V working power supply 6 . The signal conversion module 3 receives the output control signal of the single-chip microcomputer 3, and the signal conversion module 3 controls the output of the 12V working power supply according to the output control signal of the high-low level switching output by the single-chip microcomputer 3, and the output signal After being amplified by the signal conversion module 3 , the drive control signal is output to the AC solid state relay 4 .

One end of the AC solid state relay 4 is signal-connected to the signal conversion module 3 to receive the drive control signal transmitted by the signal conversion module 3 , and the other end is electrically connected to an external load 9 . The drive control signal transmitted by the signal conversion module 3 controls the on and off states of the AC solid state relay 4, so as to realize the switching between the no-load and load states of the device under test (not shown) switch. The AC solid state relay 4 can perform high-frequency fast switching, and has a long working life, which is beneficial to prolonging the service life of the equipment.

In the embodiment of the present utility model, when the control signal output by the single-chip microcomputer 1 according to the time interval parameter written in the display screen 3 is at a high level, the transistor in the signal conversion module 3 is in a conduction state, The circuit system of the signal conversion module 3 is in a conduction state, the 12V working power supply is amplified by the signal conversion module 3 and outputs a drive control signal to the AC solid state relay 4, and the AC solid state relay 4 is in a conduction state, The loop where the load 9 is located is in a closed state, and the device under test is in a loaded state; correspondingly, when the control signal output by the single-chip microcomputer 3 according to the time interval parameter output by the display screen 3 is low level , the transistor in the signal conversion module 3 is in an off state, the circuit system of the signal conversion module 3 is in an off state, and the 12V working power supply has no signal output, that is, no driving control signal is transmitted to the AC solid state relay 4. The AC solid state relay 4 is in a blocked state, the circuit where the load 9 is located is in a disconnected state, and the device under test is in a no-load state. Therefore, the automatic and fast switching of the load state is controlled according to the switching time interval set according to the demand.

As shown in FIG. 2 , a photovoltaic energy storage device 200 using the fast switching load device 100 of the present invention is shown. The photovoltaic energy storage device 200 generally includes a display module (not numbered), a communication control module (not numbered), a battery management system (not numbered), a photovoltaic inverter (not numbered) and a battery (not numbered). The display module is mainly used to display the operating status information of the entire energy storage system device, the communication control module is mainly used to coordinate the operation of each functional module in the system, and the battery management system is mainly used to control the use of the storage battery and The charging and discharging management of the photovoltaic inverter. The fast switching load device 100 can be directly connected in series between the off-grid output terminal 8 of the photovoltaic energy storage device 200 and the off-grid load 9 . The fast load device 100 automatically controls the loaded and unloaded states of the load according to the switching time interval set according to the demand, compared with the traditional manual repeated closing and opening of the load switch, eliminating the need for long-term testing. Personnel time, while ensuring precise control of the time for fast switching of loads.

To sum up, by adding a signal conversion module 3 and an AC solid-state relay 4 connected to the signal conversion module signal 3 in the device, the utility model quickly switches the load device 100 and the photovoltaic energy storage device 200. The purpose of quickly switching loads by setting the switching time interval for automatic switching of loads meets the requirements of automatic testing, is convenient to operate, saves labor costs, and controls the switching time interval accurately.

In addition, the above embodiments are only used to illustrate the utility model and not to limit the technical solution described in the utility model. The understanding of this description should be based on those skilled in the art. Detailed descriptions have been made, but those skilled in the art should understand that those skilled in the art can still modify or replace the utility model without departing from the spirit and scope of the utility model. Its improvement should be included in the scope of claims of the present utility model.

Claims (10)

1. A fast switching load device, comprising a single-chip microcomputer, a display electrically connected to the single-chip microcomputer and a working power supply for the display and the single-chip microcomputer, it is characterized in that: the fast switching load device is also provided with the A signal conversion module electrically connected to the single chip motor and an AC solid state relay electrically connected to the signal conversion module, the driving signal transmitted by the signal conversion module controls the on and off states of the AC solid state relay. 2. The fast switching load device according to claim 1, wherein the signal conversion module is a circuit system composed of several transistors and resistance elements. 3. The fast switching load device according to claim 2, wherein the signal conversion module further includes a 12V switching power supply, and the output of the 12V switching power supply is controlled by the signal conversion module. 4. The fast switching load device according to claim 3, wherein the driving signal is a control signal amplified by the 12V switching power supply through the signal conversion module. 5. The fast switching load device according to claim 4, characterized in that: the model of the single-chip microcomputer is STC12C5A60S2, and the single-chip microcomputer communicates, sends and receives instructions with the display and the signal conversion module. 6 . The fast switching load device according to claim 5 , wherein the single-chip microcomputer outputs a control signal for switching between high and low levels to the signal conversion module. 7 . 7. The fast switching load device according to claim 6, characterized in that: the time interval for switching between high and low levels of the output control signal of the single-chip microcomputer is controlled by setting parameters on the display. 8. The fast switching load device according to claim 7, characterized in that: the display uses a 1602 display screen to display the feedback information of the operating state of the single-chip microcomputer. 9. The fast switching load device according to claim 8, characterized in that: the working power supply is a 5V switching power supply. 10. A photovoltaic energy storage device, comprising a display module, a communication control module, a battery management system, a photovoltaic inverter and a storage battery, the photovoltaic inverter has a grid-connected output terminal and an off-grid output terminal, characterized in that: The photovoltaic energy storage device further includes the fast switching load device according to any one of claims 1-9, which is directly connected in series between the off-grid output terminal and the external load.