CN217882946U - Parallel direct-current power supply - Google Patents
Parallel direct-current power supply Download PDFInfo
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- CN217882946U CN217882946U CN202222005405.7U CN202222005405U CN217882946U CN 217882946 U CN217882946 U CN 217882946U CN 202222005405 U CN202222005405 U CN 202222005405U CN 217882946 U CN217882946 U CN 217882946U
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Abstract
The utility model discloses a parallel direct current power supply, which comprises a plurality of parallel power supply modules, wherein each power supply module comprises a power supply conversion unit connected between a power grid and a load and a storage battery; the power conversion unit comprises an APFC active power factor correction circuit and a first 220V DC/DC power converter which are sequentially connected in series; the input end of a 12VDC/DC power converter is also connected between the APFC active power factor correction circuit and the first 220V DC/DC power converter, the output end of the 12V DC/DC power converter is connected with the input end of a second 220V DC/DC power converter through a battery anti-reverse protection circuit, and the second 220V DC/DC power converter is connected between the first 220V DC/DC power converter and a load; the battery anti-reverse protection circuit is also connected with a storage battery. The utility model adopts the above structure parallelly connected type DC power supply, it is high to have the reliability, and is more nimble, compatible advantage such as good.
Description
Technical Field
The utility model relates to a direct current power supply technical field especially relates to a parallelly connected type direct current power supply.
Background
The existing storage battery adopts a series structure when in use, and the structure has the following problems: 1. the potential system reliability hazard exists when the storage batteries are in online capacity checking, the on-site capacity checking cost is high, and the online replacement, maintenance and capacity expansion are inconvenient; 2. when a plurality of battery packs are charged in series, the problem of unbalanced charge and discharge of each battery is easy to occur; 3. the requirement on the consistency of the internal resistance of the storage battery is high, the storage battery needs to be strictly matched, the charging and discharging precision of the whole system is seriously influenced by individual difference, and the service life of the storage battery is greatly reduced due to the condition that partial batteries are overcharged or overdischarged for a long time; 4. part of the electric energy is converted into heat energy, which wastes resources and does not save energy.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a parallelly connected type DC power supply has the reliability height, and is more nimble, compatible advantage such as good.
In order to achieve the above object, the present invention provides a parallel dc power supply, which includes a plurality of power modules connected in parallel between a power grid and a load, wherein each power module includes a power conversion unit connected between the power grid and the load and a storage battery connected to the power conversion unit;
the power conversion unit comprises an APFC active power factor correction circuit and a first 220V DC/DC power converter which are sequentially connected in series;
an input end of a 12V DC/DC power supply converter is connected between the APFC active power factor correction circuit and the first 220V DC/DC power supply converter, an output end of the 12V DC/DC power supply converter is connected with an input end of a second 220V DC/DC power supply converter through a battery anti-reverse protection circuit, and the second 220V DC/DC power supply converter is connected between the first 220V DC/DC power supply converter and a load;
the battery anti-reverse protection circuit is also connected with the storage battery.
Preferably, the power grid and the APFC active power factor correction circuit are connected in series with an alternating current input air switch.
Preferably, a direct current output air switch is connected between the second 220V DC/DC power converter and the load.
Therefore, the utility model adopts the above structure a parallelly connected type DC power supply has following beneficial effect:
1. the reliability is high, the performance of a single storage battery is reduced, other power modules cannot be influenced, the system can be conveniently configured and expanded according to the load, and the operation reliability of the direct current system is improved.
2. The system is more flexible, adopts the modular design, and can realize the system expansion and the maintenance and the replacement of the storage battery under the condition of no power failure according to the flexible configuration module quantity of the transformer substation scale.
3. The compatibility is good, the storage batteries are relatively independent, the batteries can be used in a mixed mode (new and old batteries, batteries of different brands and different types), the use efficiency of the storage batteries is improved, and the storage battery is economical and environment-friendly.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
Fig. 1 is a schematic diagram of a parallel dc power supply according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a parallel dc power supply according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, and it should be noted that the present embodiment is based on the technical solution, and the detailed embodiments and the specific operation processes are provided, but the protection scope of the present invention is not limited to the present embodiment.
Fig. 1 is a schematic diagram of a parallel dc power supply according to an embodiment of the present invention; fig. 2 is a circuit wiring diagram of a parallel dc power supply according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the structure of the present invention includes a plurality of power modules connected in parallel between the power grid and the load, wherein each power module includes a power conversion unit connected between the power grid and the load and a storage battery connected to the power conversion unit; the power conversion unit comprises an APFC active power factor correction circuit and a first 220V DC/DC power converter which are sequentially connected in series; the input end of a 12V DC/DC power converter is also connected between the APFC active power factor correction circuit and the first 220V DC/DC power converter, the output end of the 12V DC/DC power converter is connected with the input end of a second 220V DC/DC power converter through a battery anti-reverse protection circuit, and the second 220V DC/DC power converter is connected between the first 220V DC/DC power converter and a load; the battery anti-reverse protection circuit is also connected with the storage battery.
Preferably, the power grid and the APFC active power factor correction circuit are connected in series with an alternating current input air switch.
Preferably, a direct current output air switch is connected between the second 220V DC/DC power converter and the load.
The working principle is as follows: under the condition of alternating current power, the APFC performs active power factor correction; the battery is charged by a 12V DC/DC power supply converter; meanwhile, a first 220V DC/DC power converter supplies power to a load through a bus, the circuit supplies power to a conventional load, the output voltage is 230VDC, and the maximum current is 2A; if an impact load occurs and the single module output current is required to exceed 2A, firstly current is limited to enable the output voltage to be reduced to 222VDC, then the storage battery is used for supplementing the excessive current by a second 220V DC/DC power converter, the output of the second 220V DC/DC power converter is normally 2A, and the impact requirement of an inverse time-lag curve can be met. That is to say, under the condition of alternating current, the output current can meet the requirement of adding 1 time of current surge to the current found by the inverse time curve.
Under the condition of alternating current power failure, the second 220V DC/DC power converter extracts energy of the storage battery to supply power to a load through a bus, the output voltage is 222V, the long-time working current is 2A, and the impact meets an inverse time limit curve.
In this embodiment, in order to prevent the battery from supplying power to the bus when the ac power is supplied, the output voltage set by the second 220V DC/DC power converter is 222V, which is lower than 230V of the first 220V DC/DC power converter.
Therefore, the utility model adopts the above structure parallelly connected type DC power supply, it is high to have the reliability, and is more nimble, compatible advantage such as good.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solution of the present invention can still be modified or replaced by other equivalent means, and the modified technical solution can not be separated from the spirit and scope of the technical solution of the present invention.
Claims (3)
1. A parallel type direct current power supply comprises a plurality of power supply modules connected in parallel between a power grid and a load, and is characterized in that: the power supply module comprises a power supply conversion unit connected between a power grid and a load and a storage battery connected with the power supply conversion unit;
the power conversion unit comprises an APFC active power factor correction circuit and a first 220V DC/DC power converter which are sequentially connected in series;
the input end of a 12V DC/DC power converter is also connected between the APFC active power factor correction circuit and the first 220V DC/DC power converter, the output end of the 12V DC/DC power converter is connected with the input end of a second 220V DC/DC power converter through a battery anti-reverse protection circuit, and the second 220V DC/DC power converter is connected between the first 220V DC/DC power converter and a load;
the battery anti-reverse protection circuit is also connected with the storage battery.
2. A parallel type direct current power supply according to claim 1, characterized in that: and the power grid and the APFC active power factor correction circuit are connected with an alternating current input air switch in series.
3. A parallel type direct current power supply according to claim 1, characterized in that: and a direct-current output air switch is connected between the second 220V DC/DC power converter and the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222005405.7U CN217882946U (en) | 2022-08-01 | 2022-08-01 | Parallel direct-current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222005405.7U CN217882946U (en) | 2022-08-01 | 2022-08-01 | Parallel direct-current power supply |
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| Publication Number | Publication Date |
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| CN217882946U true CN217882946U (en) | 2022-11-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222005405.7U Active CN217882946U (en) | 2022-08-01 | 2022-08-01 | Parallel direct-current power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116488322A (en) * | 2023-06-25 | 2023-07-25 | 中铁电气化铁路运营管理有限公司 | Parallel low-voltage high-current output direct-current power supply device and control method |
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2022
- 2022-08-01 CN CN202222005405.7U patent/CN217882946U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116488322A (en) * | 2023-06-25 | 2023-07-25 | 中铁电气化铁路运营管理有限公司 | Parallel low-voltage high-current output direct-current power supply device and control method |
| CN116488322B (en) * | 2023-06-25 | 2023-09-12 | 中铁电气化铁路运营管理有限公司 | Parallel low-voltage high-current output direct-current power supply device and control method |
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