CN201550026U - Photovoltaic control inverter for solar energy - Google Patents

Abstract

The utility model relates to a photovoltaic control inverter dedicated to solar energy, the charging control unit of which controls the access of two sets of photovoltaic battery components; the storage battery energy storage unit provides photovoltaic battery energy storage components; the microprocessor control unit detects the battery module voltage, according to The remaining power of the battery is controlled by the first MOSFET and the second MOSFET to realize different charging methods for the battery, and at the same time detect the temperature of the battery and compensate the cut-off point. At the same time, the unit completes the battery voltage, low-voltage bus current, load voltage, For the detection of the high-voltage bus voltage, the microprocessor unit judges whether it is normal in real time, and even provides protection signals and instructions when the system fails, and shuts down the power circuit; Inverter two-stage structure, using a dedicated PWM integrated control chip to switch on and off; the auxiliary power module realizes complete isolation of input and output, and supplies power to the control chip.

Description

Photovoltaic control inverter for solar energy

technical field

The utility model relates to an inverter, in particular to a photovoltaic control inverter dedicated to solar energy, which belongs to the field of new energy utilization.

Background technique

Today, when the energy crisis is becoming increasingly prominent, the use of new energy has attracted widespread attention from all over the world. Solar energy has become an ideal among many new energy sources due to its green, non-polluting, renewable, and strong regional adaptability.

The system that converts solar energy into electrical energy for daily use is generally called a photovoltaic power generation system, which generally includes photovoltaic panels, chargers, batteries, and inverters. Among them, chargers, batteries, inverters, etc. are collectively referred to as balancing components. Chargers and inverters are responsible for converting the power of photovoltaic modules into stable 220V/50Hz AC power for daily use, and are the most important parts of the balance components.

Generally, when the charger and the inverter are used independently as a system, they are connected, and the power level can be freely matched, but the wiring is cumbersome. Many devices are used, the cost is high, the reliability is poor, the line loss is large, and the system efficiency is low.

Utility model content

1. Technical problems to be solved:

In view of the above shortcomings, the utility model provides an integrated photovoltaic charger and inverter, which improves the overall efficiency of the photovoltaic charging control inverter, and increases the portability and ease of use of solar energy utilization devices. inverter.

2. Technical solution:

The utility model comprises a charging control unit, a storage battery energy storage unit, a power conversion and its control unit, a microprocessor control unit, and an auxiliary power supply module;

The charging control unit controls the access of two sets of photovoltaic battery components;

The battery energy storage unit provides photovoltaic battery energy storage components;

The microprocessor control unit detects the voltage of the battery module, and controls the first MOSFET and the second MOSFET according to the remaining power of the battery to realize different charging methods for the battery.

The power conversion and its control unit adopt a two-stage structure of rectification and public frequency inverter after high-frequency inverter boost, and use a dedicated PWM integrated control chip to switch and control it; the front-stage main circuit uses a push-pull conversion circuit to complete the boost conversion. Its voltage stabilization detects the high-voltage bus voltage after boosting and rectification as feedback, and controls the switching tube to make its switching state ensure the stability of the high-voltage bus voltage. The high-frequency transformer ensures the isolation of input and output; the postscript samples the output AC signal and feeds it back to the control chip. Calculate the pulse width to control the switching period to stabilize the output voltage;

The auxiliary power supply module realizes complete isolation of input and output, and supplies power to the control chip.

The charging control unit controls the access of two sets of photovoltaic battery components, and if necessary, the number of channels can be increased at will, and only the corresponding power circuits and control signals need to be added.

The auxiliary power supply module adopts integrated control chip UC3842.

3. Beneficial effects:

The photovoltaic control inverter of the utility model integrates the functions of a charger and an inverter, and completes the conversion of solar energy to household electric energy. It is convenient and reliable to use only access to battery components and batteries. The photovoltaic control inverter has completed the integration of solar energy utilization devices, and the whole machine has high efficiency and strong reliability. The utility model adopts a micro-processing controller and a dedicated integrated control chip for charging control and inverter control, which improves the control accuracy of the system and greatly improves the performance index of the whole machine; the industrial-grade high-speed micro-processing chip provides system protection control and improves the reliability of the system. The two-stage inverter voltage regulation structure improves the impact resistance and output voltage accuracy of the system; the high-frequency isolation design improves the safety of the system

Description of drawings

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

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the photovoltaic control inverter dedicated to solar energy includes a charging control unit, a battery energy storage unit, a power conversion and its control unit, a microprocessor control unit, and an auxiliary power module.

The charging control unit controls the access of two sets of photovoltaic battery modules. If necessary, the number of circuits can be increased at will by adding corresponding power circuits and control signals.

The battery energy storage unit provides photovoltaic cell energy storage components.

The microprocessor control unit detects the voltage of the battery module, and controls the first MOSFET and the second MOSFET according to the remaining power of the battery to realize different charging methods for the battery. The power rises rapidly, and the second MOSFET charging circuit is turned off as the voltage rises, and the voltage continues to rise, making the first MOSFET work and pulse charging mode, floating charge for the battery voltage, closing the charging circuit when the battery is full, and switching points for all stages The hysteresis loops are all set to solve the problem of control jitter. At the same time, the temperature of the battery is detected, and the cut-off point is compensated to ensure the life of the battery. At the same time, the unit completes the detection of battery voltage, low-voltage bus current, load voltage, and high-voltage bus voltage. The microprocessor unit judges whether it is normal in real time, and even provides protection signals and instructions when the system fails. Turn off the power circuit to make the system work safely and reliably.

The power conversion and its control unit adopts a two-stage structure of rectification and public frequency inverter after high-frequency inverter boost, and uses a dedicated PWM integrated control chip to switch and control it. The pre-stage main circuit uses a push-pull conversion circuit to complete the boost conversion. Its voltage regulator detects the boosted and rectified high-voltage bus voltage as feedback, and controls the switching tube to make its switching state ensure the stability of the high-voltage bus voltage. The high-frequency transformer ensures the isolation of input and output, which ensures the safety of the system. Postscript samples the output AC signal and feeds it back to the control chip, and calculates the pulse width to control the switching period to stabilize the output voltage. The structural inverter topology increases the system's ability to resist load shocks.

In addition, to realize complete isolation of input and output, the auxiliary power supply module is an essential part. This system uses the integrated control chip UC3842 to design and realize the auxiliary power supply to supply power to the control chip.

Although the utility model has been disclosed as above with preferred embodiments, they are not used to limit the utility model, and any skilled person can make various changes or changes without departing from the spirit and scope of the utility model. modification, so the protection scope of the present utility model shall be defined by the protection scope of the claims of the present application.

Claims (3)

1. A photovoltaic control inverter dedicated to solar energy, characterized in that: comprising a charging control unit, a storage battery energy storage unit, power conversion and a control unit thereof, a microprocessor control unit, and an auxiliary power supply module; The charging control unit controls the access of two sets of photovoltaic battery components; The battery energy storage unit provides photovoltaic battery energy storage components; The microprocessor control unit detects the voltage of the battery module, and controls the first MOSFET and the second MOSFET according to the remaining power of the battery to realize different charging modes for the battery; The power conversion and its control unit adopt a two-stage structure of rectification and public frequency inverter after high-frequency inverter boost, and use a dedicated PWM integrated control chip to switch and control it; the front-stage main circuit uses a push-pull conversion circuit to complete the boost conversion. Its voltage stabilization detects the high-voltage bus voltage after boosting and rectification as feedback, and controls the switching tube to make its switching state ensure the stability of the high-voltage bus voltage. The high-frequency transformer ensures the isolation of input and output; the postscript samples the output AC signal and feeds it back to the control chip. Calculate the pulse width to control the switching period to stabilize the output voltage; The auxiliary power supply module realizes complete isolation of input and output, and supplies power to the control chip. 2. The photovoltaic control inverter dedicated to solar energy according to claim 1, characterized in that: the charging control unit controls the access of two sets of photovoltaic battery components, and if necessary, the number of circuits can be increased at will, only Need to increase the corresponding power circuit and control signal. 3. The photovoltaic control inverter dedicated to solar energy according to claim 1, wherein the auxiliary power supply module adopts an integrated control chip UC3842.