Redundant power supply circuit

Abstract

The utility model provides a redundant power supply circuit, and relates to the technical field of power supply and distribution. The circuit comprises an AC / DC switching power supply, a DC / DC switching power supply and an anti-reflux module. The anode output end of the AC / DC switching power supply and the anode output end of the DC / DC switching power supply are electrically connected with the anti-countercurrent module, and the output end of the anti-countercurrent module serves as the anode end of the redundant power supply circuit for supplying power to the outside; and the cathode output end of the AC / DC switching power supply is electrically connected with the cathode output end of the DC / DC switching power supply to form a cathode end for supplying power to the outside of the redundant power supply circuit. The first output voltage of the AC / DC switching power supply is slightly higher than the second output voltage of the DC / DC switching power supply, so that the mains supply can be preferentially used for supplying power, and when the mains supply is cut off, the battery pack is used for supplying power, so that the power shortage of the battery pack is avoided. In addition, the DC / DC switching power supply which is small in size and high in stability can replace a UPS, system cost can be reduced, and electric energy loss can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply and distribution, in particular to a redundant power supply circuit. Background Art

[0002] Under the background of today's energy structure transformation, industry and commerce are important electricity consumption industries, and industrial and commercial energy storage systems are an important development direction of energy storage. For example, as one of the power supplies for control and supporting systems in industrial and commercial energy storage systems, the 24V power supply plays a key role in maintaining the normal operation of the energy storage system. In conventional industrial and commercial energy storage systems, by configuring UPS (Uninterruptible Power System) to cooperate with the mains, through 220V / 24VAC / DC power supply, 24V dual power supply is achieved to ensure the stability of the energy storage system. However, there are also the following problems in configuring UPS: the system cost of UPS itself and its maintenance cost are relatively high; since the energy consumption of UPS power supply mainly includes no-load loss, full-load loss, and energy consumption generated by charging and discharging of built-in batteries, UPS has a large power loss, which will reduce the operating energy efficiency of the entire system. Utility Model Content

[0003] In view of this, an object of an embodiment of the present application is to provide a redundant power supply circuit, which can improve the problems of high cost and large power loss of redundant power supply.

[0004] In order to achieve the above technical objectives, the technical solutions adopted in this application are as follows:

[0005] An embodiment of the present application provides a redundant power supply circuit, the redundant power supply circuit comprising:

[0006] An AC / DC switching power supply for electrical connection to a mains power grid;

[0007] A DC / DC switching power supply and an anti-backflow module electrically connected to a battery pack, wherein a first output voltage of the AC / DC switching power supply is higher than a second output voltage of the DC / DC switching power supply, and a difference between the first output voltage and the second output voltage is within a preset range; a positive output terminal of the AC / DC switching power supply and a positive output terminal of the DC / DC switching power supply are both electrically connected to the anti-backflow module, and an output terminal of the anti-backflow module serves as a positive terminal for external power supply of the redundant power supply circuit; a negative output terminal of the AC / DC switching power supply is electrically connected to a negative output terminal of the DC / DC switching power supply, forming a negative terminal for external power supply of the redundant power supply circuit.

[0008] In some optional implementations, the redundant power supply circuit further includes: a battery pack electrically connected to an input end of the DC / DC switching power supply.

[0009] In some optional implementations, the redundant power supply circuit further includes: a power detection module electrically connected to the battery pack and used to detect the remaining power of the battery pack.

[0010] In some optional implementations, the redundant power supply circuit further includes: an alarm module electrically connected to the power detection module and used for low power alarm.

[0011] In some optional embodiments, the alarm module includes a light prompt unit and / or a sound prompt unit.

[0012] In some optional embodiments, the redundant power supply circuit further includes: a charger electrically connected to the battery pack and used to charge the battery pack, wherein an input end of the charger is used to be electrically connected to a commercial power grid.

[0013] In some optional embodiments, the redundant power supply circuit further includes: a switch module having a first switch and a second switch, wherein the first switch is connected in series to the positive input terminal of the AC / DC switching power supply, and the second switch is connected in series to the line between the positive output terminal of the DC / DC switching power supply and the input terminal of the anti-backflow module.

[0014] In some optional embodiments, the backflow prevention module includes a first diode and a second diode;

[0015] The anode of the first diode is electrically connected to the positive output terminal of the AC / DC switching power supply, and the anode of the second diode is electrically connected to the positive output terminal of the DC / DC switching power supply;

[0016] The cathode of the first diode and the cathode of the second diode are electrically connected to serve as the output end of the backflow prevention module.

[0017] In some optional implementations, the redundant power supply circuit further includes a circuit breaker disposed between the commercial power grid and the AC / DC switching power supply.

[0018] In some optional implementations, the first output voltage of the AC / DC switching power supply includes: any one of 12V, 24V, 36V and 48V.

[0019] The utility model adopting the above technical solution has the following advantages:

[0020] In the technical solution provided in the present application, the redundant power supply circuit includes an AC / DC switching power supply, a DC / DC switching power supply and an anti-backflow module. The positive output terminal of the AC / DC switching power supply and the positive output terminal of the DC / DC switching power supply are both electrically connected to the anti-backflow module, and the output terminal of the anti-backflow module serves as the positive terminal of the redundant power supply circuit for external power supply; the negative output terminal of the AC / DC switching power supply is electrically connected to the negative output terminal of the DC / DC switching power supply to form the negative terminal of the redundant power supply circuit for external power supply. The first output voltage of the AC / DC switching power supply is higher than the second output voltage of the DC / DC switching power supply, so that the mains power supply can be given priority. When the mains power is cut off, the battery pack will be used for power supply to avoid battery pack power loss. In addition, the mains power grid and the battery pack cooperate with the redundant power supply circuit to form a reliable dual-way power supply. Furthermore, the use of a small and stable DC / DC switching power supply can replace UPS, avoiding the shortcomings of high price, large size, and high regular maintenance cost of UPS. Finally, the power loss of the redundant power supply circuit is mainly the loss of the AC / DC switching power supply and the DC / DC switching power supply, and its loss is relatively small, which is beneficial to reducing the waste of power in the entire circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present application may be further described by the non-limiting embodiments given in the accompanying drawings. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A functional block diagram of a redundant power supply circuit provided in an embodiment of the present application.

[0023] Figure 2 A schematic diagram of the circuit principle of a redundant power supply circuit provided in an embodiment of the present application.

[0024] Icons: 100 - redundant power supply circuit; 110 - AC / DC switching power supply; 120 - DC / DC switching power supply; 130 - anti-backflow module; 131 - first diode; 132 - second diode; 140 - switch module. DETAILED DESCRIPTION

[0025] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0026] Please refer to Figure 1 The embodiment of the present application provides a redundant power supply circuit 100, which can be applied to industrial and commercial energy storage systems and can provide reliable power supply services for electrical equipment. The redundant power supply circuit 100 may include an AC / DC switching power supply 110, a DC / DC switching power supply 120 and an anti-backflow module 130. Among them, the input end of the AC / DC switching power supply 110 is used to be electrically connected to the mains power grid, and the input end of the DC / DC switching power supply 120 is used to be electrically connected to the battery pack.

[0027] The positive output terminal of the AC / DC switching power supply 110 and the positive output terminal of the DC / DC switching power supply 120 are both electrically connected to the anti-backflow module 130, and the output terminal of the anti-backflow module 130 serves as the positive terminal of the redundant power supply circuit 100 for external power supply. The negative output terminal of the AC / DC switching power supply 110 is electrically connected to the negative output terminal of the DC / DC switching power supply 120 to form the negative terminal of the redundant power supply circuit 100 for external power supply. Among them, the anti-backflow module 130 can improve the safety of power supply and avoid current backflow.

[0028] The first output voltage of the AC / DC switching power supply 110 is higher than the second output voltage of the DC / DC switching power supply 120, and the difference between the first output voltage and the second output voltage is within a preset range. The preset range can be flexibly set according to actual conditions, for example, the preset range is 10% or less of the second output voltage. The first output voltage is usually slightly higher than the second output voltage, so that the mains power supply can be given priority. Only when the mains power is cut off, the battery pack will be used for power supply to avoid battery pack power loss.

[0029] When the redundant power supply circuit 100 is used to supply power to the power-consuming device, the AC / DC switching power supply 110 is connected to the mains power grid, the DC / DC switching power supply 120 is connected to the battery pack, and the power-consuming device is connected to the negative terminal and the positive terminal of the redundant power supply circuit 100. That is, the mains power grid and the battery pack can form a dual power supply, and the battery pack serves as a redundant power supply. Under normal circumstances, the mains power grid supplies power to the power-consuming device. When the mains power grid is powered off, the battery pack supplies power to the power-consuming device.

[0030] It should be noted that the working voltage of the power device is adapted to the output voltage of the redundant power supply circuit 100. The output voltage of the redundant power supply circuit 100 can be the first output voltage of the AC / DC switching power supply 110 or the second output voltage of the DC / DC switching power supply 120.

[0031] In this embodiment, the AC / DC switching power supply 110 can be used to convert the alternating current of the mains power grid into a direct current output of a specified voltage, and the DC / DC switching power supply 120 can convert the direct current of the battery pack into a direct current output of a specified voltage.

[0032] The first output voltage of the AC / DC switching power supply 110 may be, but is not limited to, 12V, 24V, 36V, and 48V, etc., and may be flexibly determined according to actual conditions. The second output voltage of the DC / DC switching power supply 120 is slightly smaller than the second output voltage.

[0033] Please refer again Figure 2 In this embodiment, the backflow prevention module 130 may include two backflow prevention diodes, namely a first diode 131 and a second diode 132 .

[0034] An anode of the first diode 131 is electrically connected to the positive output terminal of the AC / DC switching power supply 110 , and an anode of the second diode 132 is electrically connected to the positive output terminal of the DC / DC switching power supply 120 .

[0035] The cathode of the first diode 131 and the cathode of the second diode 132 are electrically connected to serve as an output end of the backflow prevention module 130 .

[0036] In this embodiment, the anti-backflow module uses the first diode 131 and the second diode 132 to prevent the current output by the AC / DC switching power supply 110 from flowing to the DC / DC switching power supply 120. At the same time, it can also prevent the current output by the DC / DC switching power supply 120 from flowing to the AC / DC switching power supply 110, thereby improving the safety and reliability of power supply.

[0037] As an optional implementation, the redundant power supply circuit 100 may further include: a battery pack electrically connected to the input end of the DC / DC switching power supply 120. The battery pack may be composed of one or more single cells. The single cell may be, but is not limited to, a lithium battery, a lead-acid battery, etc.

[0038] As an optional implementation, the redundant power supply circuit 100 further includes: a power detection module electrically connected to the battery pack and used to detect the remaining power of the battery pack.

[0039] In this embodiment, the remaining power of the battery pack is detected by the power detection module, which can facilitate the management personnel to intuitively view the power usage of the battery pack and charge the battery pack when the remaining power is low. The implementation method of the power detection module to detect the remaining power of the battery pack is a conventional method and will not be described here.

[0040] As an optional implementation, the redundant power supply circuit 100 further includes: an alarm module electrically connected to the power detection module for low power alarm, wherein the alarm module includes a light prompt unit and / or a sound prompt unit.

[0041] The light prompt unit may be an alarm light, and the sound prompt unit may be a speaker or a buzzer, etc. The power detection module may generate an alarm signal when it detects that the remaining power of the battery pack is lower than the first specified power. The alarm module may emit a light and / or sound prompt upon receiving the alarm signal output by the power detection module, so as to promptly remind the management personnel of the problem that the remaining power of the battery pack is too low. The first specified power can be flexibly set according to the actual situation, for example, 20% of the total power.

[0042] As an optional implementation, the redundant power supply circuit 100 further includes: a charger electrically connected to the battery pack and used to charge the battery pack, wherein an input end of the charger is used to be electrically connected to a commercial power grid.

[0043] In this embodiment, the charger can be connected to the mains power grid to charge the battery pack. In addition, the charger is provided with a reverse current prevention diode to prevent the current of the battery pack from flowing to the mains power grid.

[0044] The charger can have functions such as automatic charging and manual charging. Manual charging means: manually plug the charger into the socket of the mains power grid and connect it to the input end of the battery pack. At this time, the charger charges the battery pack. Automatic charging means: after the charger is connected to the mains power grid and the battery pack, the battery pack will be charged only when the remaining power of the battery pack is lower than the second specified power; if the remaining power of the battery pack is higher than the second specified power, the charger does not need to charge the battery pack. The second specified power can be flexibly set according to actual conditions, for example, 50% of the total power.

[0045] As an optional implementation, the redundant power supply circuit 100 further includes: a switch module 140 having a first switch and a second switch, wherein the first switch is connected in series to the positive input terminal of the AC / DC switching power supply 110, and the second switch is connected in series to the line between the positive output terminal of the DC / DC switching power supply 120 and the input terminal of the backflow prevention module 130. As an example, the switch module 140 may be a single-pole double-way switch, or an integrated switch having at least two switches.

[0046] As an optional implementation, the redundant power supply circuit 100 further includes a circuit breaker disposed between the mains power grid and the AC / DC switching power supply 110. The type of the circuit breaker can be flexibly selected according to actual conditions.

[0047] Please refer again Figure 2 As an example, the AC / DC switching power supply 110 can be powered from the auxiliary power distribution box of the industrial and commercial energy storage cabinet by selecting a suitable circuit breaker, and the rated current of the circuit breaker is not less than 6A. The circuit breaker can be set between the switch module 140 and the mains power grid. Engineers can choose a wire diameter of not less than 1.5mm 2The wire draws power from the output terminal of the circuit breaker, and the L phase of the mains power grid is input to the 220V input L phase terminal of the AC / DC switching power supply 110 through one of the single-pole two-way switches. The N phase output of the circuit breaker is directly connected to the 220V input N phase terminal of the AC / DC switching power supply 110. Among them, the L phase line of the mains power passes through one of the two-way switch outputs to facilitate on-off control. In addition, power is drawn from the B+ / B- copper busbars connected to the battery pack of the energy storage system high-voltage box, and is respectively connected to the high-voltage input + / - terminals of the DC / DC switching power supply 120. The diameter of the connecting wire is not less than 1.5mm 2 , with a withstand voltage rating of not less than 3000V, and a fiberglass tube as the outer cover. The 24V+ on the output side of the AC / DC switching power supply 110 is connected to the input terminal of the first diode 131 for backflow prevention with a wire. The 24V- on the output side of the AC / DC switching power supply 110 is connected to the 24V- output terminal of the DC / DC switching power supply 120 with a wire. The 24V+ on the output side of the DC / DC switching power supply 120 passes through the other switch of the single-pole double-way switch and is connected to the input terminal of the second diode 132 for backflow prevention with a wire.

[0048] Based on the above design, the redundant power supply circuit 100 replaces the traditional UPS emergency power supply by using the positive and negative power supplies on the battery pack side of the energy storage system high-voltage box, and realizes the mains power output when the mains is powered on, and the battery pack power emergency output when the mains is out of power through the voltage difference between the AC / DC switching power supply 110 and the DC / DC switching power supply 120, forming a dual-circuit power supply, while ensuring that the battery pack power supply will not run out of power. The circuit is simple and reliable, does not require an additional UPS system, and uses a small and stable DC / DC switching power supply 120 to replace the UPS, avoiding the shortcomings of the UPS being high in price, large in size, and high in subsequent regular maintenance costs. The circuit has high energy conversion efficiency, can reduce energy waste, and can ensure the reliability of dual-circuit 24V power supply. That is, the circuit can reduce the investment and maintenance costs of the energy storage system and improve the integration of the energy storage system.

[0049] Through the description of the above implementation methods, technical personnel in this field can clearly understand that the present application can be implemented by hardware, and can also be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0050] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A redundant power supply circuit, characterized in that: The redundant power supply circuit comprises: An AC / DC switching power supply for electrical connection to a mains power grid; A DC / DC switching power supply and an anti-backflow module electrically connected to a battery pack, wherein a first output voltage of the AC / DC switching power supply is higher than a second output voltage of the DC / DC switching power supply, and a difference between the first output voltage and the second output voltage is within a preset range; a positive output terminal of the AC / DC switching power supply and a positive output terminal of the DC / DC switching power supply are both electrically connected to the anti-backflow module, and an output terminal of the anti-backflow module serves as a positive terminal for external power supply of the redundant power supply circuit; a negative output terminal of the AC / DC switching power supply is electrically connected to a negative output terminal of the DC / DC switching power supply, forming a negative terminal for external power supply of the redundant power supply circuit.

2. The redundant power supply circuit according to claim 1, characterized in that: The redundant power supply circuit also includes: a battery pack electrically connected to the input end of the DC / DC switching power supply.

3. The redundant power supply circuit according to claim 2, characterized in that: The redundant power supply circuit also includes: a power detection module electrically connected to the battery pack and used to detect the remaining power of the battery pack.

4. The redundant power supply circuit according to claim 3, characterized in that: The redundant power supply circuit further comprises: an alarm module electrically connected to the power detection module and used for low power alarm.

5. The redundant power supply circuit according to claim 4, characterized in that: The alarm module includes a light prompt unit and / or a sound prompt unit.

6. The redundant power supply circuit according to claim 2, characterized in that: The redundant power supply circuit further includes: a charger electrically connected to the battery pack for charging the battery pack, wherein an input end of the charger is electrically connected to a commercial power grid.

7. The redundant power supply circuit according to claim 1, characterized in that: The redundant power supply circuit also includes: a switch module having a first switch and a second switch, wherein the first switch is connected in series to the positive input terminal of the AC / DC switching power supply, and the second switch is connected in series to the line between the positive output terminal of the DC / DC switching power supply and the input terminal of the anti-backflow module.

8. The redundant power supply circuit according to claim 1, characterized in that: The backflow prevention module includes a first diode and a second diode; The anode of the first diode is electrically connected to the positive output terminal of the AC / DC switching power supply, and the anode of the second diode is electrically connected to the positive output terminal of the DC / DC switching power supply; The cathode of the first diode and the cathode of the second diode are electrically connected to serve as the output end of the backflow prevention module.

9. The redundant power supply circuit according to claim 1, characterized in that: The redundant power supply circuit also includes a circuit breaker arranged between the commercial power grid and the AC / DC switching power supply.

10. The redundant power supply circuit according to claim 1, characterized in that: The first output voltage of the AC / DC switching power supply includes any one of 12V, 24V, 36V and 48V.

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