CN203339769U - Photovoltaic mains complementary input online energy storage power supply - Google Patents

Abstract

The utility model discloses an on-line energy storage power source with complementary input of photovoltaic mains power, which comprises a mains power charging circuit, a photovoltaic charging circuit, a storage battery and a battery acquisition module corresponding thereto. The storage battery is connected with a DC output circuit and an AC output circuit. The electric charging circuit, the photovoltaic charging circuit and the AC output circuit are connected to the storage battery through a charging and discharging circuit switching module connected to the battery parameter acquisition module, and the input end of the DC output circuit is connected to the charging and discharging circuit switching module and the circuit of the battery. The energy storage power supply collects solar energy through the photovoltaic module and stores it in the battery. The battery parameter acquisition module controls the charging and discharging circuit switching module to prevent overcharging and overdischarging of the energy storage battery; the energy storage power supply and the photovoltaic module are connected through the photovoltaic input port, which is convenient for installation and transportation , suitable for use in the wild and in areas with little or no electricity. Under the condition of insufficient light, the mains input can be selected to provide uninterrupted power supply for household loads.

Description

Photovoltaic mains complementary input online energy storage power supply

technical field

The utility model belongs to the field of energy storage power supply, in particular to an on-line energy storage power supply with complementary input of photovoltaic mains power.

Background technique

The increasing shortage of energy makes all countries are committed to building an energy-saving society. Solar energy has been widely used due to its non-polluting, renewable, and inexhaustible characteristics. At present, traditional power resources are generally in short supply. Solar energy clean energy development How to effectively utilize solar energy resources to benefit mankind is one of the most dynamic research topics in the world today. The known energy storage power supply is composed of an energy storage battery pack, a protection circuit and input and output ports, and is charged by a charger. This kind of energy storage power supply cannot be connected to new solar energy, and cannot meet the user's demand for new energy utilization. The independent solar power supply system mainly uses batteries to store energy, but when the batteries are not charged in time due to weather or other reasons, the batteries will be in an over-discharge state and cannot supply power to the load. For many household appliances, continuous power supply is required, which requires flexible switching between solar photovoltaic power generation and urban grid, and both power supply methods must be able to meet the power requirements of AC loads and DC loads at the same time, so as not to Damage electrical equipment or cause interruption of power supply.

Utility model content

The purpose of the utility model is to provide an on-line energy storage power supply with complementary input of photovoltaic mains power, so as to meet the requirements of complementary input of photovoltaic mains power of the energy storage power supply and simultaneously provide AC and DC output.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a photovoltaic mains complementary input online energy storage power supply, including a battery for mains charging through a mains charging circuit and a corresponding battery parameter acquisition module, The mains charging circuit is provided with a mains charger and a mains input port for connecting with the mains, and the charging input end of the storage battery is also provided with a photovoltaic charging circuit for photovoltaic charging, and the photovoltaic charging circuit It is equipped with a photovoltaic controller and a photovoltaic input port for connecting with the photovoltaic module. The battery is connected with a DC output circuit with a DC output port and a DC-AC conversion through an inverter module with an AC output port. The AC output circuit, the mains charging circuit, the photovoltaic charging circuit and the AC output circuit are connected to the storage battery through a charging and discharging circuit switching module connected to the battery parameter acquisition module, and the input end of the DC output circuit is connected to the charging and discharging circuit switch on the circuit of the module and battery.

The mains charging circuit and the photovoltaic charging circuit are controlled and strobed through a toggle switch.

The charging and discharging circuit switching module is a bidirectional IGBT module.

A control switch is provided on the circuit between the input end of the direct current output circuit and the storage battery.

An AC output switch is provided on the inverter module of the AC output circuit.

The DC output circuit is provided with a voltage conversion module.

The energy storage power supply also includes a control panel on which a display screen is connected to the output end of the DC output circuit for power supply; the battery parameter acquisition module is connected to the display screen through communication.

The photovoltaic charging circuit, the mains charging circuit and the AC output circuit are provided with indicator lights.

A fuse is provided on the circuit between the charging and discharging circuit switching module and the storage battery.

The DC output port includes a DC output terminal and/or a DC USB output port; the AC output port includes a three-hole socket and/or a two-hole socket.

The photovoltaic mains complementary input online energy storage power supply of the utility model charges the storage battery through the mains charging circuit or the photovoltaic charging circuit, and provides DC output and AC output at the same time. Under the condition of sufficient light, the photovoltaic input can be selected to supply power for the storage battery. , when the power generated by the photovoltaic system is insufficient, you can manually select the mains input to supply power to the battery. The energy storage power supply collects solar energy through the photovoltaic module and stores it in the storage battery. The battery parameter acquisition module controls the charging and discharging circuit switching module to prevent the energy storage battery from overcharging and overdischarging; the energy storage power supply is connected to the photovoltaic module through the photovoltaic input port, which is convenient for installation and transportation , suitable for use in the wild and in areas with little or no electricity. Under the condition of insufficient light, you can choose the mains input to provide uninterrupted power supply for household loads. It is mainly used in home energy storage, commercial operations, emergency rescue, field exploration, national defense construction, emergency power supply, leisure camping and other power backup occasions.

Description of drawings

Fig. 1 is a schematic circuit diagram of the utility model;

Fig. 2 is the front panel schematic diagram of the present utility model;

Fig. 3 is the rear panel schematic diagram of the present utility model;

Figure 4 is a flow chart of photovoltaic power supply control;

Fig. 5 is the flow chart of mains power supply control;

Fig. 6 is a control logic diagram of the input and output ports of the battery of the energy storage power supply.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is further introduced.

As shown in Figure 1 is the circuit diagram of the embodiment of the utility model photovoltaic mains complementary input online energy storage power supply, as can be seen from the figure, the energy storage power supply includes a storage battery for mains charging through a mains charging circuit and a corresponding battery Parameter acquisition module, the mains charging circuit is equipped with a mains charger INCH and a mains input port for connecting with the mains, the charging input end of the battery is also equipped with a photovoltaic charging circuit for photovoltaic charging, and the photovoltaic charging circuit It is equipped with a photovoltaic controller SOCN and a photovoltaic input port for connecting with photovoltaic modules. The battery is connected with a DC output circuit with a DC output port and an AC conversion through an inverter module INV and with an AC output port. The output circuit, the output terminals of the mains charging circuit and the photovoltaic charging circuit and the input terminal of the AC output circuit are connected together, and are connected to the battery through a charging and discharging circuit switching module connected to the battery parameter acquisition module, and the input of the DC output circuit The terminal is connected to the charging and discharging circuit switching module and the circuit of the storage battery.

In addition, the mains charging circuit and the photovoltaic charging circuit are controlled and strobed through a toggle switch SA1. The charging and discharging circuit switching module of this embodiment is a bidirectional IGBT module, which uses IGBT devices for switching control, and has the function of protecting the battery pack from overcharging, overdischarging, and overloading, and does not need additional contactors, relays, etc., and has a fast control response speed , low cost, high integration, low failure rate and other advantages.

There is an input indicator HD1 on the mains input circuit; a control switch (miniature circuit breaker) QF1 is set on the circuit between the input terminal of the DC output circuit and the battery; an AC control output switch ( residual current circuit breaker) QF2 and output indicator HD2, the inverter module is equipped with an AC output switch SA2, the AC output switch controls a switch level signal, when the inverter module receives the level signal and closes, the control The AC output circuit is connected, and the basic principle of its function is: the opening and closing of the IGBT is controlled by the trigger level pulse.

For digital products such as mobile phones and ipads that are widely popular in the market, the DC output port of this embodiment includes a DC output terminal and/or a DC USB output port, which can directly charge the above-mentioned digital products; a lithium-ion power battery is used to replace the traditional The battery is more environmentally friendly and efficient, making it possible to quickly replace traditional lead-acid batteries with lithium-ion power batteries. The DC output circuit is equipped with a voltage conversion module DC/DC, which converts the 24V voltage in the system and outputs it to two power ports with a voltage of 5V. Each of the power ports is connected to a USB interface separately, totaling two (USB1 and USB2).

In order to further ensure the safety of the circuit, a fuse F is provided on the circuit between the input end of the DC output circuit and the storage battery.

The energy storage power supply also includes a control panel, on which a display screen SC1 is provided, and the display screen SC1 is connected to the output terminal of the DC output circuit for power supply; the battery parameter acquisition module is connected to the power switch SB1, and is connected to the display screen through a communication interface. This module monitors the battery cell voltage, battery temperature, and battery string current, and performs SOC estimation and leakage monitoring; there are indicator lights on the photovoltaic charging circuit, mains charging circuit and AC output circuit; the display monitors the voltage, Current, SOC, temperature and other relevant parameters are displayed in real time, allowing users to intuitively understand the operating status of the energy storage power supply.

As shown in Figure 2 and Figure 3, it is a schematic diagram of the appearance of the front and rear panels of the utility model's photovoltaic mains complementary input online energy storage power supply. It can be seen from the figure that the front panel includes an AC input indicator light, a photovoltaic input indicator light, and an AC output indicator Lamp and battery undervoltage indicator and display screen, DC USB output port and AC output switch SA2, switching strobe switch SA1 for mains AC input and photovoltaic DC input, power switch SB1 and AC output socket (including three-hole socket and two hole socket); the rear panel includes mains input port, photovoltaic input port and cooling fan, which can automatically start the cooling fan according to the temperature setting value, with temperature management function; in addition, it also includes battery power input interface, control switch QF1 (that is, the battery power input switch in Figure 3) and the communication interface.

In this embodiment, the battery adopts 16 single lithium iron phosphate batteries as an example, and its working principle and process are explained as follows:

Charging scheme: The energy storage power supply sends out a pulse trigger signal through the small ship-type switching strobe switch on the control panel to control its charging mode to switch between photovoltaic and mains. The maximum charging current of the mains can reach 10A, and the maximum charging current of photovoltaics Can reach 45A. When the power switch SB1 is pressed and the display shows that the battery information is normal and there is no protection, when the photovoltaic power generation system is selected for charging, the photovoltaic module passes through the photovoltaic input port, switching strobe switch SA1 (photovoltaic input), photovoltaic controller SOCN, and control switch QF1 Connect to the battery for charging; when the mains charging is selected, the mains is connected to the battery through the mains input port, the switch strobe switch SA1 (mains input), the mains charger INCH, and the control switch QF1. During the charging process, the battery parameter acquisition module will continuously detect the voltage and temperature of all 16 single batteries in a cycle of 20ms. When it is detected that the voltage or temperature of any battery exceeds the set value (this parameter is adjustable), the battery parameter acquisition module sends a pulse trigger signal to the bidirectional IGBT module, disconnects the charging circuit, and before the alarm parameter returns to the normal value , and then manually send out any charging trigger signal, it will not close the IGBT conduction charging circuit. While disconnecting the charging circuit, the battery parameter acquisition module will send an alarm signal to the overvoltage indicator light on the operation panel, and inform the user through the display screen, so as to ensure the charging safety and functional index requirements of the entire energy storage power supply.

Discharge scheme: The discharge is divided into two parts: one part realizes the AC output through the inverter module, and the other part realizes the DC USB5V output through the DC voltage conversion module circuit. When the power supply is output, the battery parameter acquisition module can realize the acquisition and calculation of all battery parameters. When any single battery is detected to be undervoltage or overtemperature (threshold parameter can be adjusted), it will send a pulse signal to the IGBT to discharge When the IGBT receives the pulse signal, it will control the discharge circuit to disconnect, and before the alarm parameter returns to the normal value, if any discharge trigger signal is manually issued, the IGBT conduction discharge circuit will not be closed, and the undervoltage signal will be output at the same time. The undervoltage indicator light and display screen on the operation panel inform the user, thereby ensuring the discharge safety and functional index requirements of the entire energy storage power supply.

In addition, the photovoltaic input is designed as a wide dynamic DC input of 30V-100V, so it has a wide range of photovoltaic module access functions, which is convenient for users to connect 1-2 photovoltaic modules in series according to the actual situation.

As shown in Figure 4, the photovoltaic power supply control flow chart of the energy storage power supply of the utility model is shown. It can be seen from the figure that when the load is 0, it is judged whether the voltage of the battery is greater than the maximum set value, and if it is greater than the set value, the photovoltaic power supply is directly disconnected. Input, otherwise use photovoltaic input to charge the battery; when the load is not 0, judge whether the voltage of the battery is less than the minimum set value, if it is less than, use the photovoltaic system to directly supply power to the load, otherwise use the photovoltaic system and the battery as the load powered by.

As shown in Figure 5, the utility model energy storage power supply mains power supply control flow chart, as can be seen from the figure, when the load is 0, it is judged whether the voltage of the storage battery is greater than the maximum set value, and if it is greater than the set value, it is directly disconnected Mains input, otherwise use the mains input to charge the battery; when the load is not 0, judge whether there is a mains, if so, use the mains to directly supply power to the load, otherwise use the battery to jointly supply power to the load.

As shown in Figure 6, the control logic diagram of the battery input and output ports of the energy storage power supply of the utility model is shown. First, the voltage of the battery is detected, and if the detected cell voltage value is greater than the maximum set value of the cell charging, the charging input port is disconnected; If the voltage value of the battery pack is within the set range, the charging and discharging port is closed; if the detected cell voltage value is lower than the minimum setting value of the cell charging, the discharging port is disconnected.

Under the condition of sufficient light, the energy storage power supply of the utility model can select the photovoltaic input to supply power to the storage battery; when the power generation of the photovoltaic system is insufficient, the mains input can be manually selected to supply power to the storage battery to meet the needs of the system as a backup power supply. After the power grid is cut off, the energy storage power supply can realize the automatic switching function of the load power supply, and realize the automatic switching between the mains power and the energy storage power supply of the electric equipment. Under the condition of stable mains power, the electric equipment is given priority to use the mains power supply. ; If the mains fails, it can automatically switch to the battery power supply to provide uninterrupted power supply for the load.

The utility model has the following characteristics: the rated capacity of the energy storage power supply is 2.5kWh, which can be expanded in the range of 2.4kWh～6kWh according to the demand. The energy storage power supply collects solar energy through the photovoltaic module and stores it in the storage battery. The battery parameter acquisition module controls the charging and discharging circuit switching module to prevent the energy storage battery from overcharging and overdischarging; the energy storage power supply is connected to the photovoltaic module through the photovoltaic input port, which is convenient for installation and transportation , suitable for use in the wild and in areas with little or no electricity. Under the condition of insufficient light, you can choose the mains input to provide uninterrupted power supply for household loads. It is mainly used in home energy storage, commercial operations, emergency rescue, field exploration, national defense construction, emergency power supply, leisure camping and other power backup occasions.

In this embodiment, a switching gating switch is used to switch the mains input and photovoltaic input. Of course, the switching gating can also be realized by using an interlocking switch circuit. Any similar transformation into a conventional technical means for those skilled in the art falls within the scope of the utility model. within the scope of protection.

Claims (10)

1. An on-line energy storage power supply with complementary input of photovoltaic mains power, characterized in that: it includes a storage battery for mains charging through a mains charging circuit and a battery parameter acquisition module corresponding thereto, and the mains charging circuit is provided with A mains charger and a mains input port for connecting with the mains. The charging input end of the storage battery is also provided with a photovoltaic charging circuit for photovoltaic charging. The photovoltaic charging circuit is provided with a photovoltaic controller and used for The photovoltaic input port connected with the photovoltaic module, the battery is connected with a DC output circuit with a DC output port and an AC output circuit with an AC output port for DC-AC conversion through an inverter module, and the mains charging The circuit, the photovoltaic charging circuit and the AC output circuit are connected to the storage battery through a charging and discharging circuit switching module connected to the battery parameter acquisition module, and the input end of the DC output circuit is connected to the charging and discharging circuit switching module and the circuit of the battery. 2. The on-line energy storage power supply with complementary input of photovoltaic mains power according to claim 1, characterized in that: said mains power charging circuit and photovoltaic charging circuit are controlled and strobed by a toggle switch. 3. The on-line energy storage power supply with complementary input of photovoltaic mains power according to claim 1, characterized in that: the charging and discharging circuit switching module is a bidirectional IGBT module. 4. The on-line energy storage power supply with complementary input of photovoltaic mains power according to claim 1, characterized in that a control switch is provided on the circuit between the input terminal of the DC output circuit and the storage battery. 5. The on-line energy storage power supply with complementary input of photovoltaic mains power according to claim 1, characterized in that: the inverter module of the AC output circuit is provided with an AC output switch. 6. The on-line energy storage power supply with complementary input of photovoltaic mains power according to any one of claims 2-5, characterized in that: said DC output circuit is provided with a voltage conversion module. 7. The photovoltaic mains complementary input online energy storage power supply according to claim 6, characterized in that: the energy storage power supply also includes a control panel, the control panel is provided with a display screen, and the output terminal of the display screen and the DC output circuit Power supply connection; the battery parameter acquisition module is connected to the display screen through communication. 8. The on-line energy storage power supply with complementary input of photovoltaic mains power according to claim 7, characterized in that: the photovoltaic charging circuit, the mains power charging circuit and the AC output circuit are provided with indicator lights. 9. The on-line energy storage power supply with complementary input of photovoltaic mains power according to claim 8, characterized in that a fuse is provided on the circuit between the charging and discharging circuit switching module and the storage battery. 10. The photovoltaic mains complementary input online energy storage power supply according to claim 9, characterized in that: the DC output port includes a DC output terminal and/or a DC USB output port; the AC output port includes three holes sockets and/or two-prong sockets.

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