A backup inverter integrated power supply

Abstract

The utility model aims at providing a backup inverter integration power supply, easy operation, easy maintenance, internal battery is easy to replace, effectively promotes power supply stability of power distribution automation terminal. The utility model discloses inverter complete machine, inverter complete machine includes two -way switching unit, two -way switching unit accesses alternating current input power supply, two -way switching unit is connected with inverter control unit and contactor, inverter control unit includes AC / DC conversion unit, battery, DC / AC conversion unit that connects gradually, DC / AC conversion unit with contactor connects, contactor with power distribution terminal is connected. The utility model is applied to the technical field of inverter.

Description

Technical Field

[0001] This utility model applies to the technical field of inverters, and particularly relates to an integrated backup inverter power supply. Background Technology

[0002] FTU refers to a distribution automation terminal. An inverter converts DC power into AC power of fixed frequency and voltage or frequency and voltage regulation. It mainly consists of an inverter bridge, control logic, and filter circuits. The product involves the field of DC-to-AC power conversion technology. In accordance with the State Grid Corporation's "1135" distribution network operation service management strategy, this battery-chargeable inverter is specifically designed for distribution automation terminals and is suitable for pole-mounted FTU front-end power supply or other industries requiring uninterrupted DC power supply with high requirements. There are three types of FTU energy storage power supply and placement methods: 1. External phosphoric acid battery, 2. Internal capacitor, 3. Internal lithium battery. FTUs are usually installed outdoors, and their energy storage power supply may age or experience contact failures over time. Most inverters use the FTU's own built-in power supply for power inversion. If the internal energy storage power supply of the FTU fails after the AC source is disconnected, the FTU will be unable to continue operating, and the replacement process for the internal energy storage of the FTU is quite cumbersome.

[0003] This product has two output modes. Under normal circumstances, when AC power is available, the contactor inside the inverter switches to bypass output AC power to supply power to the FTU. If the AC power is disconnected, the contactor automatically switches to main output, using the DC voltage from the inverter's internal battery to convert it into AC voltage to power the FTU, extending its continuous operating time, similar to the function of a "power bank". When AC power is restored, the contactor inside the product automatically switches to AC output and charges the inverter's internal battery. The internal battery is easy to replace, and the entire unit is simple to operate and maintain. Therefore, it is necessary to provide a backup inverter integrated power supply that is easy to operate and maintain, with an easily replaceable internal battery, effectively improving the power supply stability of the distribution automation terminal. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a backup inverter integrated power supply that is easy to operate and maintain, with an easy-to-replace internal battery, effectively improving the power supply stability of the power distribution automation terminal.

[0005] The technical solution adopted by this utility model is as follows: This utility model includes an inverter unit, the inverter unit includes a dual-channel switching unit, the dual-channel switching unit is connected to an AC input power supply, the dual-channel switching unit is connected to an inverter control unit and a contactor, the inverter control unit includes an AC / DC conversion unit, a battery, and a DC / AC conversion unit connected in sequence, the DC / AC conversion unit is connected to the contactor, and the contactor is connected to the power distribution terminal.

[0006] As can be seen from the above scheme, this application has two output modes. Under normal circumstances, when the AC input power is available, the contactor switches to bypass output AC power to supply power to the distribution terminal. If the AC input power is disconnected, the contactor automatically switches to main output, using the DC voltage of the inverter's internal battery to convert it into AC voltage to power the distribution terminal, extending its continuous working time, similar to the function of a "power bank". When the AC input power is restored, the contactor automatically switches to AC output and charges the inverter's internal battery. The internal battery is easy to replace. The structure of switching between bypass output and main output after dual power input inverter effectively avoids the situation where the FTU fails to work due to power failure, which helps to improve the power supply stability of the distribution terminal. It is easy to operate and maintain. The entire inverter adopts a waterproof design, which can improve safety.

[0007] In a preferred embodiment, the AC / DC conversion unit includes a power management chip and a high-frequency transformer, the power management chip is connected to the dual-path switching unit, and the power management chip is connected to the battery via the high-frequency transformer.

[0008] In a preferred embodiment, the inverter control unit further includes a signal sampling circuit connected to the battery.

[0009] In a preferred embodiment, the inverter control unit further includes a drive board, and the AC / DC conversion unit, the battery, and the DC / AC conversion unit are all connected to the drive board.

[0010] In a preferred embodiment, the inverter control unit further includes an alarm and reverse connection protection circuit connected to the battery. Attached Figure Description

[0011] Figure 1 This is a system architecture diagram of this utility model;

[0012] Figure 2 This is a flowchart of the inverter voltage process of this utility model;

[0013] Figure 3This is the circuit schematic of the AC / DC conversion unit;

[0014] Figure 4 This is the circuit schematic of the signal sampling circuit.

[0015] Figure 5 This is the circuit diagram of the alarm and reverse connection protection circuit.

[0016] Figure 6 This is the circuit schematic of the DC / AC conversion unit 8. Detailed Implementation

[0017] like Figures 1 to 6 As shown, in this embodiment, the present invention includes an inverter unit 1, which includes a dual-channel switching unit 2 connected to an AC input power supply 3. The dual-channel switching unit 2 is connected to an inverter control unit 4 and a contactor 5. The inverter control unit 4 includes an AC / DC conversion unit 6, a battery 7, and a DC / AC conversion unit 8 connected in sequence. The DC / AC conversion unit 8 is connected to the contactor 5, and the contactor 5 is connected to the power distribution terminal 9. The DC / AC conversion unit 8 is used to convert the battery voltage inside the inverter into AC voltage.

[0018] This application has two output modes. Under normal circumstances, when the AC input power supply 3 is powered on, the contactor 5 switches to bypass output AC power to supply power to the distribution terminal 9. If the AC input power supply 3 is disconnected, the contactor 5 automatically switches to main output, using the DC voltage of the battery inside the inverter to convert it into AC voltage to power the distribution terminal 9, extending its continuous working time, similar to the function of a "power bank". When the AC input power supply 3 is restored, the contactor 5 automatically switches to AC output and charges the battery inside the inverter.

[0019] The dual-path switching unit 2 includes a main path and a bypass path. Two AC input power supplies 3 are input to the dual-path switching unit 2, which switches one input to the inverter unit 1. If the AC power supply is available at the front end, it charges the battery inside the inverter. Simultaneously, the contactor 5 switches to the bypass output, directly outputting the AC power from the front end to the power distribution terminal 9. If the AC power supply is interrupted, the battery 7 outputs AC power through the DC / AC conversion unit 8, and the contactor 5 switches to the main output, allowing the battery 7 to supply power to the power distribution terminal 9.

[0020] like Figure 3As shown, in this embodiment, the AC / DC conversion unit 6 includes a power management chip U1 and a high-frequency transformer T1. The power management chip U1 is connected to the dual-channel switching unit 2, and the power management chip U1 is connected to the battery 7 via the high-frequency transformer T1. The AC / DC conversion unit 6 converts the input AC to stable DC, ensuring the stability and reliability of the output voltage. It is suitable for various occasions requiring DC power supply. AC: Alternating Current; DC: Direct Current.

[0021] like Figure 4 As shown, in this embodiment, the inverter control unit 4 further includes a signal sampling circuit connected to the battery 7. The signal sampling circuit samples the battery voltage and the output voltage, and the output voltage is adjusted according to the sampled voltage.

[0022] In this embodiment, the inverter control unit 4 further includes a drive board, and the AC / DC conversion unit 6, the battery 7, and the DC / AC conversion unit 8 are all connected to the drive board. The drive board is model EGS005Q, and it is used to achieve an empty carrier waveform distortion rate of less than 1.5%, a full carrier waveform distortion rate of less than 3%, and a high-precision output voltage, which can meet the waveform requirements of the inverter industry.

[0023] like Figure 5 As shown, in this embodiment, the inverter control unit 4 also includes an alarm and reverse connection protection circuit. The alarm and reverse connection protection circuit is connected to the battery 7. The module's internal buzzer sounds after the battery is reverse-connected, and the power supply is not damaged. It also has overload and short circuit protection functions.

[0024] In this embodiment, Figure 2 This demonstrates the process of converting battery voltage into AC power and outputting it within the inverter. The inverter consists of: a DC input unit (receiving DC power to charge the battery and power subsequent units); a voltage regulation unit (adjusting the DC voltage to the operating voltage of the inverter units); an inverter unit (converting the DC voltage from the DC input unit into AC voltage); a rectification and filtering unit (ensuring the inverted voltage waveform is sinusoidal); and an AC output unit (outputting the shaped AC power after inversion).

[0025] In this embodiment, the parameters of the inverter unit 1 are described as follows:

[0026] (1) The module's AC input operating range is 176-264Vac / 45-65Hz, with a typical value of 220Vac / 50Hz.

[0027] (2) Operating ambient temperature range: -40℃ to +70℃.

[0028] (3) The main power input and the backup power input are isolated from each other with a withstand voltage of 2000Vac and a leakage current of ≤5mA.

[0029] (4) The maximum charging current of the 24V lithium iron phosphate battery is 0.8-1.4A, and the full charge voltage is 28.5-29V.

[0030] (5) Equipped with one working indicator light and two touch buttons (inverter start and stop).

[0031] (6) Protective performance:

[0032] 1. It has protection functions against DC bus voltage overvoltage and undervoltage.

[0033] 2. The module's internal buzzer sounds after the battery is reversed, but the power supply is not damaged.

[0034] 3. The inverter output has overload and short circuit protection functions.

[0035] 4. Electromagnetic compatibility performance: Meets the requirements of Level 4 electromagnetic compatibility anti-interference capability.

[0036] In this embodiment, the parameter values ​​tested are:

[0037]

[0038]

[0039] Although the embodiments of this utility model are described with reference to actual solutions, they do not constitute a limitation on the meaning of this utility model. For those skilled in the art, modifications to the implementation schemes and combinations with other schemes based on this specification are obvious.

Claims

1. A backup inverter integrated power supply, comprising an inverter unit (1), characterized in that: The inverter unit (1) includes a dual-channel switching unit (2), which is connected to an AC input power supply (3). The dual-channel switching unit (2) is connected to an inverter control unit (4) and a contactor (5). The inverter control unit (4) includes an AC / DC conversion unit (6), a battery (7), and a DC / AC conversion unit (8) connected in sequence. The DC / AC conversion unit (8) is connected to the contactor (5), and the contactor (5) is connected to a power distribution terminal (9).

2. The backup inverter integrated power supply according to claim 1, characterized in that: The AC / DC conversion unit (6) includes a power management chip (U1) and a high-frequency transformer (T1). The power management chip (U1) is connected to the dual-path switching unit (2), and the power management chip (U1) is connected to the battery (7) via the high-frequency transformer (T1).

3. The backup inverter integrated power supply according to claim 1, characterized in that: The inverter control unit (4) further includes a signal sampling circuit, which is connected to the battery (7).

4. The backup inverter integrated power supply according to claim 1, characterized in that: The inverter control unit (4) also includes a drive board, and the AC / DC conversion unit (6), the battery (7), and the DC / AC conversion unit (8) are all connected to the drive board.

5. The backup inverter integrated power supply according to claim 1, characterized in that: The inverter control unit (4) also includes an alarm and reverse connection protection circuit, which is connected to the battery (7).

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