Multi-loop power supply circuit for charging pile, charging device and charging equipment

Abstract

The utility model belongs to the technical field of charging system power supply control, and discloses a multi-loop power supply circuit for a charging pile, a charging device and charging equipment. The multi-loop power supply circuit comprises a power supply end, a Q1 power supply switch, a Q2 power supply switch, a KM1 alternating current contactor and a QF1 load switch; the KM1 alternating current contactor comprises a normally-open main contact, a normally-closed main contact and an A1 coil, the Q1 power supply switch input end and the Q2 power supply switch input end are both connected with the power supply end, the Q2 power supply switch output end is connected with the normally-open main contact of the KM1 alternating current contactor, the Q1 power supply switch output end is connected with the normally-closed main contact of the KM1 alternating current contactor, and the Q1 power supply switch output end is connected with the normally-closed main contact of the KM1 alternating current contactor. A normally-closed main contact and a normally-open main contact of the KM1 alternating current contactor are connected with the input end of a QF1 load switch, the output end of the QF1 load switch is used for being connected with a load, the input and output end of an A1 coil is connected with the output end of a Q2 power supply switch, and the technical problem that in the prior art, a charging pile is powered off from a single loop, and when the loop is powered off or breaks down, all terminals cannot operate is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power supply control of charging systems, and relates to a multi-circuit power supply circuit, a charging device and charging equipment for a charging pile. Background Art

[0002] With the rapid development of the charging pile industry, users are increasingly demanding high-power charging, which is driving charging pile manufacturers to move towards group charging and supercharging. For high-power main cabinets, the incoming current can reach thousands of amperes, posing a severe challenge to the power supply system.

[0003] If a single-circuit power supply is used, a frame circuit breaker is usually used, but it is large in size and heavy in weight, which makes it very inconvenient to install, maintain and replace. Currently, high-power group charging hosts on the market all use plastic cases. For hosts with a capacity of more than 800A, in order to ensure the stability and safety of the power supply, a strategy of evenly dividing the power supply among modules is usually adopted, and two or more plastic case circuit breakers are used for protection. However, many charging pile terminals on the market draw power from a single circuit of the host. If this circuit is powered off or fails, all terminals will not be able to operate.

[0004] Therefore, a multi-circuit power supply circuit, a charging device and a charging pile for a charging pile are proposed, which can ensure normal use of other modules when some modules of the host are powered off. Utility Model Content

[0005] The purpose of the present utility model is to provide a multi-circuit power supply circuit, a charging device and a charging equipment for a charging pile. Through the multi-circuit power supply design, when there is a problem with a power supply of a certain power supply module of the charging pile host, only the power supply module of the corresponding power supply is cut off, and the whole machine will not be unable to operate. The technical problem in the prior art that the terminals of the charging pile draw power from a single circuit of the host and all terminals will be unable to continue to operate if this circuit is powered off or fails is solved.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A multi-circuit power supply circuit for a charging pile includes: a power supply end, a Q1 power supply switch, a Q2 power supply switch, a KM1 AC contactor, and a QF1 load switch; the input ends of the Q1 power supply switch and the Q2 power supply switch are respectively connected to the power supply end, the input end of the KM1 AC contactor is connected to the output end of the Q1 power supply switch and the output end of the Q2 power supply switch, the output end of the KM1 AC contactor is connected to the input end of the QF1 load switch, and the output end of the QF1 load switch is used to connect the load.

[0007] Furthermore, the KM1 AC contactor includes a normally open main contact, a normally closed main contact and an A1 coil; the Q1 power supply switch output end is connected to the normally closed main contact, the Q2 power supply switch output end is connected to the normally open main contact, the normally open main contact and the normally closed main contact output ends are both connected to the QF1 load switch input end, and the A1 coil input and output ends are connected to the Q2 power supply switch output end.

[0008] Furthermore, the power supply end includes m power supplies, and the m power supplies are adapted to the number of KMn AC contactors, KMn is n AC contactors, and m=n+1.

[0009] Furthermore, the KM1 AC contactor is 4P / 2NO+2NC.

[0010] Furthermore, it also includes a Q3 power supply switch, a KM2 AC contactor, and a QF2 load switch; the input end of the Q3 power supply switch is connected to the power supply end, the output end of the Q3 power supply switch is connected to the input end of the normally open main contact of the KM2 AC contactor, the normally closed main contact input end of the KM2 AC contactor is connected to the output end of the QF1 load switch, the normally closed main contact output end of the KM2 AC contactor is used to connect the load, and the normally open main contact output end of the KM2 AC contactor is connected to the normally closed main contact output end of the KM2 AC contactor.

[0011] Furthermore, it also includes a Qm power supply switch, a KMn AC contactor, and a QFn load switch; the input end of the Qm power supply switch is connected to the power supply end, the output end of the Qm power supply switch is connected to the input end of the normally open main contact of the KMn AC contactor, the normally closed main contact input end of the KMn AC contactor is connected to the load switch output end of the QFn-1 load switch, the normally closed main contact output end of the KMn AC contactor is used to connect to the load, and the normally open main contact output end of the KMn AC contactor is connected to the normally closed main contact output end of the KMn AC contactor.

[0012] Furthermore, the KMn AC contactor determines whether the power supply is at a low level through the analog digital input interface of the CMU_DI control board.

[0013] Furthermore, the m 2,n 1.

[0014] The utility model also provides a charging device, comprising the above-mentioned multi-circuit power supply circuit for a charging pile.

[0015] The utility model also provides a charging device, comprising the above-mentioned charging device.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The utility model discloses a multi-circuit power supply circuit for a charging pile, which designs the charging pile into multiple independent power supply circuits, each circuit is responsible for a specific module or component, and each circuit is independent of each other and does not affect each other.

[0018] The utility model discloses a multi-circuit power supply circuit for a charging pile. The AC contactor is equipped with a redundant power supply. When the main power supply fails, the redundant power supply can quickly take over the power supply task to ensure the continuous operation of modules or components.

[0019] The utility model discloses a multi-circuit power supply circuit for a charging pile. The circuit monitors the power status of each circuit in real time through the analog digital input interface of the control panel. Once the main power supply fails, the circuit switches to the redundant power supply and issues a warning signal, facilitating timely maintenance by maintenance personnel.

[0020] The utility model discloses a multi-circuit power supply circuit for a charging pile. The multi-circuit power supply redundancy design helps to extend the service life of the charging pile host and its components. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 The utility model is a circuit diagram of a multi-circuit power supply circuit applied to a charging pile. DETAILED DESCRIPTION

[0023] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," and the like in the specification and claims of the present invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the numbers used in this manner are interchangeable where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or that are inherent to these processes, methods, products, or apparatus.

[0025] The present invention is described in further detail below with reference to the accompanying drawings:

[0026] Example 1

[0027] The utility model provides a multi-circuit power supply circuit for a charging pile. Taking two-way Q1 power supply switches and Q2 power supply switches as examples, the circuit further includes a power supply terminal, a KM1 AC contactor, and a QF1 load switch. The power supply terminal includes two power supplies, each power supply including a neutral wire and a live wire, the neutral wire being represented by the letter N and the live wire being represented by the letter L. The Q1 power supply switch is connected to the first power supply, the Q2 power supply switch is connected to the second power supply, the KM1 AC contactor is composed of two normally open main contacts, two normally closed main contacts, and an A1 coil. The output terminal of the Q1 power supply switch is connected to the normally closed main contact of the KM1 AC contactor, the output terminal of the Q2 power supply switch is connected to the normally open main contact of the KM1 AC contactor, the output terminals of the normally open main contact and the normally closed main contact of the KM1 AC contactor are both connected to the input terminal of the QF1 load switch, the output terminal of QF1 is used to connect to the load, and finally, the input and output terminals of the A1 coil are connected to the output terminal of the Q2 power supply switch. It should be noted that the KM1 AC contactor is a 4P / 2NO+2NC type.

[0028] Working principle: Under normal conditions, the Q1 power supply switch and the Q2 power supply switch supply power, and the A1 coil of the KM1 AC contactor is energized. After that, the two normally closed main contacts of the KM1 AC contactor are disconnected and the two normally open main contacts are closed. The Q2 power supply switch supplies power to the QF1 load switch behind it. When the power supply circuit of the Q2 power supply switch fails, the two normally closed main contacts of the KM1 AC contactor change from the disconnected state to the closed state, and the two normally open main contacts of the KM1 AC contactor change from the closed state to the disconnected state. At this time, the A1 coil loses power, and the KM1 AC contactor returns to its initial state. Figure 1 As shown, the QF1 load switch will continue to be powered by the Q1 power switch.

[0029] Example 2

[0030] Taking the three-way Q1 power supply switch, Q2 power supply switch, and Q3 power supply switch as an example, it also includes the KM1 AC contactor, KM2 AC contactor, QF1 load switch, and QF2 load switch. The KM2 AC contactor consists of two normally open main contacts, two normally closed main contacts, and the A2 coil. In this case, the QF1 load switch is a power switch for the Q1 power supply switch and the Q2 power supply switch through the KM1 AC contactor. The two normally closed main contacts of the KM2 AC contactor are connected to the output of the QF1 load switch. The input of the Q3 power supply switch is connected to the power supply, and the output is connected to the two normally open main contacts of the KM2 AC contactor. The two normally closed main contacts and two normally open main contacts of the KM2 AC contactor are both connected to the QF2 load switch. The output of the QF2 load switch is used to connect to the load. Finally, the input and output of the A2 coil are connected to the output of the Q3 power supply switch.

[0031] By analogy, the power supply terminal includes m power supplies, each of which is connected to m power switches, represented as Q1 through Qm. Q1 through Qm represent power switches for different power supplies, and the number of power switches is determined by the number of power supplies, m. AC contactors KM1 through KMn have two normally open and two normally closed main contacts. The number of KMn AC contactors matches the number of Qm power switches, where m = n + 1. It should be noted that there are at least two Qm power switches, and at least one KMn AC contactor. The input of the Qm power switch is connected to the power supply terminal, the output of the Qm power switch is connected to the input of the normally open main contact of the KMn AC contactor, the normally closed main contact input of the KMn AC contactor is connected to the output of the QFn-1 load switch, the normally closed main contact output of the KMn AC contactor is used to connect to a load, and the normally open main contact output of the KMn AC contactor is connected to the normally closed main contact output of the KMn AC contactor.

[0032] To sum up, for the three power supply circuits, the rear-stage power supply of the KM1 AC contactor with dual power supply redundancy is regarded as one power supply, and the third power supply is regarded as two power supplies. Repeat the redundant solution of the two power supply circuits, and so on for four power supplies, five power supplies...

[0033] The CMU_DI control board also includes analog and digital inputs, which are compatible with the number of KMn AC contactors. These interfaces are connected to the corresponding KMn AC contactors to determine whether the power supply is in a low-level state. If a low-level state is detected, it indicates a problem with the power supply, requiring maintenance personnel to investigate the power supply or circuit. The load can utilize multiple backup power sources, significantly reducing the probability of load power outages or failures and improving load reliability. Finally, the power supply is connected to a 220V voltage.

[0034] Example 3

[0035] The utility model also provides a charging device, including the above-mentioned multi-circuit power supply circuit for the charging pile, the multi-circuit power supply circuit includes: a Qm power supply switch, a KMn AC contactor, and a QFn load switch; the input end of the Qm power supply switch is connected to the power supply end, the output end of the Qm power supply switch is connected to the input end of the normally open main contact of the KMn AC contactor, the normally closed main contact input end of the KMn AC contactor is connected to the load switch output end of the QFn-1 load switch, the normally closed main contact output end of the KMn AC contactor is used to connect to the load, and the normally open main contact output end of the KMn AC contactor is connected to the normally closed main contact output end of the KMn AC contactor.

[0036] Example 4

[0037] The utility model also provides a charging device, including the above-mentioned charging device, the charging device including a Qm power supply switch, a KMn AC contactor, and a QFn load switch; the input end of the Qm power supply switch is connected to the power supply end, the output end of the Qm power supply switch is connected to the input end of the normally open main contact of the KMn AC contactor, the normally closed main contact input end of the KMn AC contactor is connected to the load switch output end of the QFn-1 load switch, the normally closed main contact output end of the KMn AC contactor is used to connect to the load, and the normally open main contact output end of the KMn AC contactor is connected to the normally closed main contact output end of the KMn AC contactor.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A multi-circuit power supply circuit for a charging pile, characterized by: Including power supply end, Q1 power supply switch, Q2 power supply switch, KM1 AC contactor, QF1 load switch; The input ends of the Q1 power supply switch and the Q2 power supply switch are respectively connected to the power supply end, the input end of the KM1 AC contactor is connected to the output end of the Q1 power supply switch and the output end of the Q2 power supply switch, the output end of the KM1 AC contactor is connected to the input end of the QF1 load switch, and the output end of the QF1 load switch is used to connect the load.

2. The multi-circuit power supply circuit for a charging pile according to claim 1, characterized in that: The KM1 AC contactor includes a normally open main contact, a normally closed main contact and an A1 coil; The output end of the Q1 power supply switch is connected to the normally closed main contact, the output end of the Q2 power supply switch is connected to the normally open main contact, the output ends of the normally open main contact and the normally closed main contact are both connected to the input end of the QF1 load switch, and the input and output ends of the A1 coil are connected to the output end of the Q2 power supply switch.

3. The multi-circuit power supply circuit for a charging pile according to claim 1, characterized in that: The power supply end includes m power supplies, and the m power supplies are adapted to the number of KMn AC contactors, KMn is n AC contactors, and m=n+1.

4. The multi-circuit power supply circuit for a charging pile according to claim 1, characterized in that: The KM1 AC contactor is 4P / 2NO+2NC.

5. The multi-circuit power supply circuit for a charging pile according to claim 2, characterized in that: It also includes Q3 power supply switch, KM2 AC contactor, QF2 load switch; The Q3 power supply switch input end is connected to the power supply end, the Q3 power supply switch output end is connected to the input end of the normally open main contact of the KM2 AC contactor, the normally closed main contact input end of the KM2 AC contactor is connected to the output end of the QF1 load switch, the normally closed main contact output end of the KM2 AC contactor is used to connect the load, and the normally open main contact output end of the KM2 AC contactor is connected to the normally closed main contact output end of the KM2 AC contactor.

6. The multi-circuit power supply circuit for a charging pile according to claim 2, characterized in that: It also includes Qm power supply switch, KMn AC contactor, QFn load switch; The Qm power supply switch input end is connected to the power supply end, the Qm power supply switch output end is connected to the input end of the normally open main contact of the KMn AC contactor, the normally closed main contact input end of the KMn AC contactor is connected to the load switch output end of the QFn-1 load switch, the normally closed main contact output end of the KMn AC contactor is used to connect the load, and the normally open main contact output end of the KMn AC contactor is connected to the normally closed main contact output end of the KMn AC contactor.

7. The multi-circuit power supply circuit for a charging pile according to claim 6, characterized in that: The KMn AC contactor determines whether the power supply is at a low level through the analog digital input interface of the CMU_DI control board.

8. The multi-circuit power supply circuit for a charging pile according to claim 3, characterized in that: The m 2,n 1.

9. A charging device, characterized in that: It comprises a multi-circuit power supply circuit for a charging pile as described in any one of claims 1-8.

10. A charging device, characterized in that: Comprising the charging device as claimed in claim 9.

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