Control circuit of auxiliary power supply, auxiliary power supply and optical storage all-in-one machine

Abstract

The utility model relates to the technical field of optical storage all-in-one machine auxiliary power supply control, in particular to a control circuit of an auxiliary power supply, the auxiliary power supply and an optical storage all-in-one machine. The control circuit comprises a multi-path electricity taking unit, an electrical conversion unit and an auxiliary power supply unit. The multi-path electricity taking unit is used for obtaining electric energy from a plurality of power supplies; the electrical conversion unit is electrically connected with the multi-path power taking unit and is used for adjusting and isolating each path of power supply; and the auxiliary power supply unit is electrically connected with the electrical conversion unit and is used for providing stable auxiliary power supply output. The multi-path electricity taking unit comprises a photovoltaic electricity taking circuit, a storage battery electricity taking circuit and an alternating current electricity taking circuit. The electrical conversion unit comprises an MPPT circuit, an isolation transformer, a switching circuit and a rectifying circuit. According to the utility model, multi-source power supply and effective isolation of the auxiliary power supply are realized, and the power supply stability and the system safety are improved. Meanwhile, due to the design of the electrical conversion unit, effective utilization and conversion of each path of power supply are ensured, and the overall efficiency and reliability of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of auxiliary power supply control of light storage all -in -one, concretely relates to a control circuit of auxiliary power supply, auxiliary power supply and light storage all -in -one. BACKGROUND

[0002] In the existing light storage all -in -one system, the power supply stability and system isolation of auxiliary power supply are two problems that need to be solved. The current auxiliary power supply system usually relies on single power input, which leads to the auxiliary power supply may not be able to continuously and stably power in certain working conditions, such as power grid failure or insufficient battery power. This power instability may cause the operation of the entire light storage all -in -one system to be interrupted, affecting the reliability and efficiency of the system.

[0003] In addition, the existing auxiliary power supply system often lacks effective electrical isolation measures. Direct connection between different power sources may cause electrical interference, and even in some cases, safety hazards. For example, when the high-voltage power grid is directly connected with the low-voltage battery system, sensitive equipment may be damaged or safety accidents may occur due to voltage surges.

[0004] In addition, the existing system also has deficiencies in switching and coordination between multiple power sources. When switching between different power sources, there may be a brief power interruption or voltage fluctuation, which is unacceptable for critical equipment that requires continuous and stable power supply.

[0005] These problems seriously affect the overall performance and reliability of the light storage all -in -one system. The instability of the auxiliary power supply may cause the failure of system monitoring, control and protection functions, and the lack of effective isolation increases the safety risk of the system. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a control circuit of auxiliary power supply, auxiliary power supply and light storage all -in -one to solve the problems of unstable power supply of auxiliary power supply and lack of effective isolation in the prior art.

[0007] To achieve the above-mentioned purpose, the utility model provides a control circuit of auxiliary power supply, which comprises a multiple power taking unit, an electrical conversion unit and an auxiliary power supply unit. The multiple power taking unit is used for obtaining electrical energy from multiple power sources. The electrical conversion unit is electrically connected with the multiple power taking unit and is used for adjusting and isolating each power source. The auxiliary power supply unit is electrically connected with the electrical conversion unit and is used for providing stable auxiliary power output.

[0008] Further, the multiple power taking unit comprises a photovoltaic power taking circuit, and the electrical conversion unit comprises an MPPT circuit. The output end of the photovoltaic power taking circuit is electrically connected with the input end of the MPPT circuit, and the output end of the MPPT circuit is electrically connected with the auxiliary power supply unit.

[0009] Specifically, the multi-path power taking unit comprises a battery power taking circuit, and the electrical conversion unit comprises a first isolation transformer. An output end of the battery power taking circuit is electrically connected with an input end of the first isolation transformer, and an output end of the first isolation transformer is electrically connected with the auxiliary power supply unit. The first isolation transformer is a high-frequency isolation step-up transformer.

[0010] In addition, the multi-path power taking unit comprises an alternating current power taking circuit, and the alternating current power taking circuit comprises a power grid power taking circuit and a backup power source power taking circuit. The electrical conversion unit comprises a switching circuit, a rectifier circuit and a second isolation transformer. The power grid power taking circuit and the backup power source power taking circuit are electrically connected with an input end of the switching circuit, an output end of the switching circuit is electrically connected with an input end of the rectifier circuit, an output end of the rectifier circuit is electrically connected with an input end of the second isolation transformer, and an output end of the second isolation transformer is electrically connected with the auxiliary power supply unit. The second isolation transformer is a high-frequency isolation step-down transformer.

[0011] In addition, the electrical conversion unit further comprises an anti-backflow device, and the anti-backflow device is electrically connected with an output end of the electrical conversion unit.

[0012] Further, the utility model still includes output adjustment unit, output adjustment unit is electrically connected with the output end of auxiliary power supply unit. Output adjustment unit comprises third isolation transformer, be used for outputting multi-path low voltage direct current.

[0013] In order to realize above-mentioned purpose, the utility model also provides an auxiliary power supply, including as above-mentioned control circuit, is used for providing stable power output.

[0014] In addition, the utility model further provides a light storage integrated machine, including photovoltaic power generation unit, energy storage unit, inverter unit and as above-mentioned auxiliary power supply. Photovoltaic power generation unit, energy storage unit, inverter unit and the auxiliary power supply are electrically connected with each other, realize multifunctional power management.

[0015] The auxiliary power supply control circuit provided by the utility model realizes flexible switching of multiple power supplies through the multi-path power taking unit, improves the power supply stability of the auxiliary power supply. The isolation transformer in the electrical conversion unit realizes effective isolation between each power supply, and improves the safety of the system to a certain extent. In addition, the design of the auxiliary power supply unit ensures stable power output, and meets the continuous operation demand of the light storage integrated machine system.

[0016] The use of the MPPT circuit improves the efficiency of photovoltaic power generation, and the application of the high-frequency isolation transformer not only realizes electrical isolation, but also performs voltage conversion, so that each power supply can adapt to the demand of the auxiliary power supply. The design of the switching circuit and the rectifier circuit enables the AC power supply to be flexibly switched and converted into DC power, further enhancing the adaptability of the system. The anti-backflow device prevents current backflow and protects each power supply unit. The design of the output regulation unit ensures the stability of the output voltage, meeting the power supply needs of different devices. These features work together to improve the overall performance and reliability of the photovoltaic storage integrated machine system to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is an embodiment of the auxiliary power supply control circuit block diagram of the utility model;

[0018] Figure 2 It is an embodiment of the auxiliary power supply control circuit structure diagram of the utility model.

[0019] In the figure: 10, multiple power taking units, 11, photovoltaic power taking circuit, 12, battery power taking circuit, 13, AC power taking circuit, 131, power grid power taking circuit, 132, backup power supply power taking circuit, 20, electrical conversion unit, 21, MPPT circuit, 22, first isolation transformer, 23, switching circuit, 24, rectifier circuit, 25, second isolation transformer, 26, anti-backflow device, 30, auxiliary power supply unit, 40, output regulation unit, 41, third isolation transformer. DETAILED DESCRIPTION

[0020] The technical scheme of the utility model will be described in detail below in combination with the drawings and specific embodiments. It should be noted that the described embodiments are only used to explain the technical principles of the utility model, and not to limit the scope of protection. Those skilled in the art should understand that without deviating from the spirit and scope of the utility model, various modifications, changes or equivalent replacements can be made to these embodiments. These modifications, changes or equivalent replacements should be considered to fall within the protection scope defined in the claims of the utility model.

[0021] As Figure 1 and Figure 2 shown, the utility model provides a kind of auxiliary power supply control circuit, including multiple power taking unit 10, electrical conversion unit 20 and auxiliary power supply unit 30.The multiple power taking unit 10 is used to obtain electric energy from multiple power supply.The electrical conversion unit 20 is electrically connected with the multiple power taking unit 10, for adjusting and isolating each power supply.The auxiliary power supply unit 30 is electrically connected with the electrical conversion unit 20, for providing stable auxiliary power supply output.

[0022] The multi-channel power extraction unit 10 includes a photovoltaic power extraction circuit 11. The electrical conversion unit 20 includes an MPPT circuit 21. Figure 2 As shown, the PV+ and PV- ports of the photovoltaic array are connected to the MPPT circuit. The output of the MPPT circuit is connected to the auxiliary power supply via a DC bus and a first diode. The output of the photovoltaic power extraction circuit 11 is electrically connected to the input of the MPPT circuit 21, and the output of the MPPT circuit 21 is electrically connected to the auxiliary power supply unit 30. Preferably, the operating frequency of the MPPT circuit 21 is 20kHz to 100kHz.

[0023] The multi-channel power supply unit 10 also includes a battery power supply circuit 12. The electrical conversion unit 20 includes a first isolation transformer 22. Figure 2 As shown, the BAT+ and BAT- ports of the battery are connected to the first high-frequency isolation transformer. The output of the first high-frequency isolation transformer outputs DC 200V, which supplies power to the auxiliary power supply through the second diode. The secondary winding of the first high-frequency isolation transformer is grounded. The output of the battery power supply circuit 12 is electrically connected to the input of the first isolation transformer 22, and the output of the first isolation transformer 22 is electrically connected to the auxiliary power supply unit 30. The first isolation transformer 22 is a high-frequency isolation step-up transformer. Preferably, the operating frequency of the first isolation transformer 22 is 50kHz to 200kHz, and the step-up ratio is 1:5 to 1:10.

[0024] The multi-source power supply unit 10 further includes an AC power supply circuit 13, which comprises a mains power supply circuit 131 and a backup power supply circuit 132. The electrical conversion unit 20 includes a switching circuit 23, a rectifier circuit 24, and a second isolation transformer 25. For example... Figure 2 As shown, the diesel generator and the power grid are connected to a relay switching circuit. The output of the relay switching circuit is connected to a rectifier bridge circuit, and the output of the rectifier bridge circuit is connected to a second high-frequency isolation transformer. The second high-frequency isolation transformer outputs DC 200V and supplies power to the auxiliary power supply through a third diode. The secondary winding of the second high-frequency isolation transformer is grounded. The power grid circuit 131 and the backup power supply circuit 132 are electrically connected to the input of the switching circuit 23. The output of the switching circuit 23 is electrically connected to the input of the rectifier circuit 24. The output of the rectifier circuit 24 is electrically connected to the input of the second isolation transformer 25. The output of the second isolation transformer 25 is electrically connected to the auxiliary power supply unit 30. The second isolation transformer 25 is a high-frequency isolation step-down transformer. Preferably, the operating frequency of the second isolation transformer 25 is 40kHz to 150kHz, and the step-down ratio is 10:1 to 20:1.

[0025] The electrical conversion unit 20 further comprises an anti-backflow device 26, which is electrically connected with the output end of the electrical conversion unit 20. The anti-backflow device 26 is a diode. Preferably, the diode is a Schottky diode, and the reverse breakdown voltage thereof is not less than 600 V.

[0026] The utility model further includes an output adjustment unit 40, which is electrically connected with the output end of the auxiliary power supply unit 30. As shown in Figure 2 After the auxiliary power supply is powered, it outputs multiple low-voltage direct currents through the third high-frequency isolation step-down transformer, and outputs a stable power supply, and the auxiliary power supply is grounded. The output adjustment unit 40 includes a third isolation transformer 41 for outputting multiple low-voltage direct currents. Preferably, the output voltage of the third isolation transformer 41 includes 3.3 V, 5 V, 12 V, and 24 V.

[0027] In one specific embodiment of the utility model, the photovoltaic power supply circuit 11 is connected to a photovoltaic array, and the output voltage range thereof is 200 V to 800 V. The MPPT circuit 21 converts the voltage into a stable 400 V direct current voltage. The battery power supply circuit 12 is connected to a 48 V battery, and the voltage is raised to 400 V through the first isolation transformer 22. The alternating current power supply circuit 13 can be connected to a 220 V alternating current power grid or a 220 V diesel generator, and the voltage is converted into a 400 V direct current voltage through the switching circuit 23, the rectifier circuit 24, and the second isolation transformer 25. The three 400 V direct current voltages are collected to the auxiliary power supply unit 30 through the anti-backflow device 26, and then converted into the required multiple low-voltage direct currents through the output adjustment unit 40.

[0028] The auxiliary power supply control circuit of the utility model mainly realizes stable and reliable power supply through the three stages of multiple power supply, electrical conversion, and auxiliary power supply output. In the multiple power supply stage, the direct current generated by the photovoltaic array is input to the MPPT circuit 21 through the photovoltaic power supply circuit 11; the 48 V battery is connected to the first isolation transformer 22 through the battery power supply circuit 12; and the 220 V alternating current power grid or the 220 V diesel generator is connected to the switching circuit 23 through the alternating current power supply circuit 13.

[0029] In the electrical conversion stage, the MPPT circuit 21 performs maximum power point tracking on the photovoltaic input, converts the unstable photovoltaic voltage into a stable 400 V direct current voltage, the first isolation transformer 22 boosts the 48 V battery voltage to 400 V direct current voltage and provides electrical isolation. The switching circuit 23 selects the power grid or the backup power supply according to the power supply demand, the rectifier circuit 24 converts the alternating current into direct current, and the second isolation transformer 25 adjusts the voltage to 400 V direct current and provides isolation.

[0030] In the auxiliary power output stage, three 400V DC currents are collected by respective diodes (anti-backflow devices 26) to the auxiliary power unit 30. The auxiliary power unit 30 receives the collected electric energy and ensures stable output through internal control. The output adjustment unit 40 (third isolation transformer 41) converts the 400V DC current into multiple low-voltage DC currents (such as 3.3V, 5V, 12V, and 24V) to meet the power supply requirements of different devices.

[0031] During the control process, the system preferentially uses photovoltaic power generation, and the MPPT circuit 21 adjusts in real time to obtain maximum power output. When photovoltaic power generation is insufficient, the system automatically switches to battery power supply and provides the required electric energy through the first isolation transformer 22. If neither photovoltaic power nor battery power can meet the power supply requirements, the system starts to take power from the power grid, and if the power grid is unavailable, it switches to a backup power source (such as a diesel generator).

[0032] The switching circuit 23 is responsible for smooth switching between different AC power sources to ensure power supply continuity. All power sources output stable 400V DC currents after passing through respective isolation transformers and rectifier circuits. The anti-backflow devices 26 (diodes) prevent reverse current flow to protect each power source. The auxiliary power unit 30 comprehensively manages multiple inputs to ensure stable and reliable power output. The output adjustment unit 40 converts the voltage into multiple low-voltage DC currents according to actual requirements for use by various devices.

[0033] Through this multiple protection and intelligent control method, the circuit can provide continuous and stable auxiliary power in various situations, thereby improving the reliability and adaptability of the system to a certain extent.

[0034] In another embodiment, the utility model provides a kind of auxiliary power, and the auxiliary power includes the control circuit as described above. Electric energy is obtained from different power sources by multiple power taking units, and each power source is adjusted and isolated by electrical conversion unit, and finally stable power output is provided by auxiliary power unit. The auxiliary power in the embodiment is suitable for a variety of power supply environments, and can still provide continuous power support in the case of power grid fluctuation or unstable photovoltaic power generation.

[0035] In another embodiment, the utility model further provides a kind of light storage integrated machine, and the light storage integrated machine includes photovoltaic power generation unit, energy storage unit, inverter unit and auxiliary power as described above. The photovoltaic power generation unit is used to convert solar energy into electric energy, the energy storage unit is used to store electric energy, the inverter unit is used to convert DC into AC, and the auxiliary power is responsible for providing stable power output in the case of unstable photovoltaic power generation or insufficient energy storage. The synergistic effect between each unit enables the light storage integrated machine to efficiently manage and allocate electric energy, achieving power supply in multiple scenarios.

[0036] The control circuit of the auxiliary power supply has the following beneficial effects:

[0037] The multi-path power taking unit realizes flexible switching of multiple power supplies, improves the power supply stability and reliability of the auxiliary power supply. The isolation transformer in the electrical conversion unit realizes effective isolation between the power supplies, enhancing the safety of the system. The use of the MPPT circuit improves the efficiency of photovoltaic power generation, and the application of the high-frequency isolation transformer not only realizes electrical isolation, but also performs voltage conversion, so that each power supply can adapt to the needs of the auxiliary power supply. The design of the switching circuit and the rectifier circuit enables the AC power supply to be flexibly switched and converted to DC power, further enhancing the adaptability of the system. The setting of the anti-flow device prevents current backflow and protects each power supply unit. The design of the output adjustment unit ensures the stability of the output voltage, meeting the power supply needs of different devices. These features work together to improve the overall performance and reliability of the photovoltaic storage integrated machine system to a certain extent, providing a guarantee for the long-term stable operation of the system.

[0038] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Therefore, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and its equivalent technologies, the utility model also intends to include these modifications and variations.

Claims

1. A control circuit for an auxiliary power supply, characterized by include: A multi-source power supply unit is used to obtain electrical energy from multiple power sources; An electrical conversion unit, the input of which is connected to the output of the multiple power supply unit, is used to regulate and isolate each power source; An auxiliary power supply unit, the input of which is electrically connected to the output of the electrical conversion unit, is used to provide a stable auxiliary power output; The multi-channel power supply unit includes a photovoltaic power supply circuit, a battery power supply circuit, and an AC power supply circuit. The electrical conversion unit includes an MPPT circuit for connecting the photovoltaic power supply circuit, a first isolation transformer for connecting the battery power supply circuit, and a switching circuit, a rectifier circuit, and a second isolation transformer for connecting the AC power supply circuit.

2. The control circuit of claim 1, wherein, The output terminal of the photovoltaic power collection circuit is electrically connected to the input terminal of the MPPT circuit, and the output terminal of the MPPT circuit is electrically connected to the auxiliary power supply unit.

3. The control circuit of claim 1, wherein, The output terminal of the battery power supply circuit is electrically connected to the input terminal of the first isolation transformer, and the output terminal of the first isolation transformer is electrically connected to the auxiliary power supply unit.

4. The control circuit of claim 3, wherein, The first isolation transformer is a high-frequency isolation step-up transformer.

5. The control circuit of claim 1, wherein, The AC power supply circuit includes a mains power supply circuit and a backup power supply circuit. The mains power supply circuit and the backup power supply circuit are electrically connected to the input terminal of the switching circuit. The output terminal of the switching circuit is electrically connected to the input terminal of the rectifier circuit. The output terminal of the rectifier circuit is electrically connected to the input terminal of the second isolation transformer. The output terminal of the second isolation transformer is electrically connected to the auxiliary power supply unit.

6. The control circuit of claim 5, wherein, The second isolation transformer is a high-frequency isolation step-down transformer.

7. The control circuit of claim 1, wherein, The electrical conversion unit also includes an anti-backflow device, which is electrically connected to the output terminal of the electrical conversion unit.

8. The control circuit of claim 1, wherein, It also includes an output regulation unit, which is electrically connected to the output terminal of the auxiliary power supply unit. The output regulation unit includes a third isolation transformer for outputting multiple low-voltage DC power.

9. An auxiliary power supply, characterized by Includes the control circuit as described in any one of claims 1-8.

10. A light storage integrated machine, characterized by, include: The photovoltaic power generation unit, energy storage unit, inverter unit, and auxiliary power supply as described in claim 9; wherein the photovoltaic power generation unit, energy storage unit, inverter unit, and auxiliary power supply are electrically connected.

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