Power supply module for charging pile and charging pile

Abstract

The embodiment of the utility model discloses a power supply module for a charging pile and the charging pile, relates to the technical field of charging equipment, and aims to reduce the cost of the charging pile. According to the power module for the charging pile, the input end of a phase-shifting transformer is used for being connected with a power grid; the input end of the first rectifier is connected with the first output end of the phase-shifting transformer; the input end of the second rectifier is connected with the second output end of the phase-shifting transformer; the first output end of the second rectifier is connected with the first output end of the first rectifier; the first input end of the first DC-DC converter is connected with the second output end of the first rectifier, and the second input end of the first DC-DC converter is connected with the second output end of the second rectifier; the first output end of the first DC-DC converter is used for being connected with the first input end of a first charging gun, and the second output end of the first DC-DC converter is used for being connected with the second input end of the first charging gun.

Description

Technical Field

[0001] The present application relates to the technical field of charging equipment, and in particular to a power module for a charging pile and a charging pile. Background Art

[0002] The development of electric boats has put forward higher and higher requirements for fast charging. The development of new power batteries has supported 10C charging, that is, full charge in 6 minutes, with a charging power of up to 600kW and a charging current of 600A. The charging pile in the prior art is connected to the DC-DC converter by a distribution transformer through a power regulation circuit, and then the electric boat is charged through the output end of the DC-DC converter. However, the cost of the distribution transformer and the power regulation circuit is high, resulting in a high cost of the existing charging pile. Summary of the invention

[0003] In view of this, an embodiment of the present application provides a power module for a charging pile and a charging pile, which is convenient for reducing the cost of the charging pile.

[0004] In a first aspect, an embodiment of the present application provides a power supply module for a charging pile, comprising: a phase-shifting transformer, wherein the input end of the phase-shifting transformer is used to connect to a power grid; a first rectifier, wherein the input end of the first rectifier is connected to the first output end of the phase-shifting transformer; a second rectifier, wherein the input end of the second rectifier is connected to the second output end of the phase-shifting transformer; the first output end of the second rectifier is connected to the first output end of the first rectifier; a first DC-DC converter, wherein the first input end of the first DC-DC converter is connected to the second output end of the first rectifier, and the second input end of the first DC-DC converter is connected to the second output end of the second rectifier; the first output end of the first DC-DC converter is used to be connected to the first input end of a first charging gun, and the second output end of the first DC-DC converter is used to be connected to the second input end of the first charging gun.

[0005] According to a specific implementation of the embodiment of the present application, the first DC-DC converter is a non-isolated DC-DC converter.

[0006] According to a specific implementation manner of the embodiment of the present application, the second input end of the first DC-DC converter and the second output end of the first DC-DC converter are the same end.

[0007] According to a specific implementation method of an embodiment of the present application, it also includes a first blocking diode; the positive electrode of the first blocking diode is connected to the first output end of the first DC-DC converter; the negative electrode of the first blocking diode is used to be connected to the first input end of the first charging gun; the first output end of the first DC-DC converter is a positive electrode.

[0008] According to a specific implementation method of the embodiment of the present application, it also includes: a third rectifier, the input end of the third rectifier is connected to the third output end of the phase-shifting transformer; a fourth rectifier, the input end of the fourth rectifier is connected to the fourth output end of the phase-shifting transformer; the first output end of the fourth rectifier is connected to the first output end of the third rectifier; a second DC-DC converter, the first input end of the second DC-DC converter is connected to the second output end of the third rectifier, and the second input end of the second DC-DC converter is connected to the second output end of the fourth rectifier; the first output end of the second DC-DC converter is used to be connected to the first input end of the second charging gun, and the second output end of the second DC-DC converter is used to be connected to the second input end of the second charging gun.

[0009] According to a specific implementation method of an embodiment of the present application, it also includes a second blocking diode; the positive electrode of the second blocking diode is connected to the first output end of the second DC-DC converter; the negative electrode of the second blocking diode is used to be connected to the first input end of the second charging gun; the first output end of the second DC-DC converter is the positive electrode.

[0010] According to a specific implementation method of the embodiment of the present application, it also includes a first relay and a second relay; the first end of the first relay is connected to the first output end of the first DC-DC converter; the second end of the first relay is connected to the first output end of the second DC-DC converter; the first end of the second relay is connected to the second output end of the first DC-DC converter; the second end of the second relay is connected to the second output end of the second DC-DC converter.

[0011] According to a specific implementation method of the embodiment of the present application, it also includes: an inner shell, in which the first rectifier, the second rectifier, the third rectifier, the fourth rectifier, the first DC-DC converter and the second DC-DC converter are arranged; an outer shell, in which the inner shell is arranged; the phase-shifting transformer is arranged between the outer shell and the inner shell.

[0012] In the second aspect, an embodiment of the present application provides a charging pile, including: a power module, a first charging gun and a second charging gun; the power module is the power module described in the aforementioned embodiment; the first input of the first charging gun is connected to the first output end of the first DC-DC converter; the second input of the first charging gun is connected to the second output end of the first DC-DC converter; the first input of the second charging gun is connected to the first output end of the second DC-DC converter; the second input of the second charging gun is connected to the second output end of the second DC-DC converter.

[0013] In the present embodiment, a power module and a charging pile for a charging pile are provided, wherein the input end of the phase-shifting transformer is used to connect to a power grid, the input end of the first rectifier is connected to the first output end of the phase-shifting transformer, the input end of the second rectifier is connected to the second output end of the phase-shifting transformer, the first output end of the second rectifier is connected to the first output end of the first rectifier, the first input end of the first DC-DC converter is connected to the second output end of the first rectifier, the second input end of the first DC-DC converter is connected to the second output end of the second rectifier, the first output end of the first DC-DC converter is used to be connected to the first input end of the first charging gun, and the second output end of the first DC-DC converter is used to be connected to the second input end of the first charging gun. In this way, it is convenient to reduce the cost of the power module for the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic diagram of the structure of a power module for a charging pile provided in one embodiment of the present application. DETAILED DESCRIPTION

[0016] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings. It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0017] In order to enable those skilled in the art to better understand the technical concept, implementation plan and beneficial effects of the embodiments of the present application, specific embodiments are described in detail below.

[0018] Figure 1 A schematic diagram of a power module for a charging pile provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the power module for the charging pile of this embodiment may include: a phase-shifting transformer 1, a first rectifier 2, a second rectifier 3 and a first DC-DC converter 4.

[0019] The input end of the phase-shifting transformer 1 in this embodiment is used to connect to the power grid; the input end of the first rectifier 2 is connected to the first output end of the phase-shifting transformer 1; the input end of the second rectifier 3 is connected to the second output end of the phase-shifting transformer 1; the first output end of the second rectifier 3 is connected to the first output end of the first rectifier 2; the first input end of the first DC-DC converter 4 is connected to the second output end of the first rectifier 2, and the second input end of the first DC-DC converter 4 is connected to the second output end of the second rectifier 3.

[0020] In some embodiments, the input end of the phase-shifting transformer 1 can be connected to a high voltage of 10kV or 6kV, and the input voltage is phase-shifted by the phase-shifting transformer 1. The phase A1 of the voltage output from the first output end of the phase-shifting transformer 1 and the phase A2 of the voltage output from the first output end of the phase-shifting transformer 1 are not equal, for example, A1=22.5°, A2=-7.5°. It can be understood that the specific values ​​of A1 and A2 can be other angles besides the above examples.

[0021] In this embodiment, the phase-shifting transformer 1 can be used to isolate the power grid and the electric vehicle ship that is being charged by the power module in this embodiment.

[0022] The first output end of the phase-shifting transformer 1 is connected to the input end of the first rectifier 2 , and the first output end of the phase-shifting transformer 1 is connected to the input end of the second rectifier 3 , and a DC voltage is obtained through the first rectifier 2 and the second rectifier 3 respectively.

[0023] In some examples, the first rectifier 2 and the second rectifier 3 are three-phase regulators.

[0024] In this embodiment, the first output end of the second rectifier 3 is connected to the first output end of the first rectifier 2. It can be understood that the first output end of the second rectifier 3 is different from the first output end of the first rectifier 2 in that it is not a negative pole, nor a positive pole. That is, the first rectifier 2 and the second rectifier 3 are connected in series, and then the second output end of the first rectifier 2 is connected to the first input end of the first DC-DC converter 4, and the second output end of the second rectifier 3 is connected to the second input end of the first DC-DC converter 4. The change of the DC value is achieved through the first DC-DC converter 4.

[0025] In some examples, the first DC-DC converter 4 is a non-isolated DC-DC converter.

[0026] In some examples, the first DC-DC converter 4 is a multiple interleaved quasi-resonant soft-switching liquid-cooled step-down DC-DC converter; in other examples, the first DC-DC converter 4 is a step-down DC-DC converter.

[0027] The first output end of the first DC-DC converter 4 is used to be connected to the first input end of the first charging gun, and the second output end of the first DC-DC converter 4 is used to be connected to the second input end of the first charging gun.

[0028] The electric boat can be charged using the first charging gun.

[0029] In order to simplify the external structure of the first DC-DC converter 4, in some examples, the second input terminal of the first DC-DC converter 4 and the second output terminal of the first DC-DC converter 4 are the same terminal, that is, the second input terminal of the first DC-DC converter 4 and the second output terminal of the first DC-DC converter 4 share one terminal.

[0030] In this embodiment, the input end of the phase-shifting transformer 1 is used to connect to the power grid, the input end of the first rectifier 2 is connected to the first output end of the phase-shifting transformer 1, the input end of the second rectifier 3 is connected to the second output end of the phase-shifting transformer 1, the first output end of the second rectifier 3 is connected to the first output end of the first rectifier 2, the first input end of the first DC-DC converter 4 is connected to the second output end of the first rectifier 2, the second input end of the first DC-DC converter 4 is connected to the second output end of the second rectifier 3, the first output end of the first DC-DC converter 4 is used to be connected to the first input end of the first charging gun, and the second output end of the first DC-DC converter 4 is used to be connected to the second input end of the first charging gun. In this way, it is convenient to reduce the cost of the power module used for the charging pile and avoid the problem of high cost of the charging pile caused by the use of distribution transformers, power regulation circuits and DC-DC converters in the prior art.

[0031] In order to improve the reliability of charging the electric boat, in some examples, a first blocking diode 5 is also included.

[0032] The positive electrode of the first blocking diode 5 is connected to the first output end of the first DC-DC converter 4; the negative electrode of the first blocking diode 5 is used to be connected to the first input end of the first charging gun; the first output end of the first DC-DC converter 4 is the positive electrode.

[0033] The positive electrode of the first blocking diode 5 is connected to the positive electrode of the first DC-DC converter 4 , and the negative electrode of the first blocking diode 5 is used to be connected to the first input end of the first charging gun.

[0034] In some examples, the device further includes: a third rectifier 6 , a fourth rectifier 7 and a second DC-DC converter 8 .

[0035] Among them, the input end of the third rectifier 6 is connected to the third output end of the phase-shifting transformer 1; the input end of the fourth rectifier 7 is connected to the fourth output end of the phase-shifting transformer 1; and the first output end of the fourth rectifier 7 is connected to the first output end of the third rectifier 6.

[0036] A first input end of the second DC-DC converter 8 is connected to a second output end of the third rectifier 6 , and a second input end of the second DC-DC converter 8 is connected to a second output end of the fourth rectifier 7 .

[0037] The first output end of the second DC-DC converter 8 is used to be connected to the first input end of the second charging gun, and the second output end of the second DC-DC converter 8 is used to be connected to the second input end of the second charging gun.

[0038] The circuit formed by the third rectifier 6, the fourth rectifier 7 and the second DC-DC converter 8 in this embodiment is isolated from the circuit formed by the first rectifier 2, the second rectifier 3 and the first DC-DC converter 4. In this way, when the electric boat is charged using the second charging gun, it is isolated from the electric boat charged using the first charging gun, thereby improving safety.

[0039] In some examples, the phases of the voltages outputted from the third output terminal and the fourth output terminal of the phase-shifting transformer 1 are different, and are also different from the first output terminal and the second output terminal of the phase-shifting transformer 1. For example, the phase outputted from the first output terminal of the phase-shifting transformer 1 is 22.5°, the phase outputted from the second output terminal is -7.5°, the phase outputted from the third output terminal is 7.5°, and the phase outputted from the fourth output terminal is -22.5°.

[0040] In one example, a high voltage of 10 kV or 6 kV is input to the phase-shifting transformer 1, and converted into four groups of 420 V outputs of 22.5°, -7.5°, 7.5° and -22.5° with equal capacity and isolation from each other, wherein 22.5° and -7.5° are respectively input to the first rectifier 2 and the second adjuster and then connected in series, and 7.5° and -22.5° are respectively input to the third rectifier 6 and the fourth adjuster and then connected in series, to obtain two mutually isolated DC bus bars of about 1100 V. In this way, the current of the four groups of outputs can be equalized, thereby making the primary total current harmonic distortion (THDI) of the phase-shifting transformer 1 less than 3%.

[0041] In some examples, the first rectifier 2 and the second rectifier 3 , the third rectifier 6 and the fourth rectifier 7 may be rectifiers of the same model, and the first DC-DC converter 4 and the second DC-DC converter 8 may be converters of the same model.

[0042] In order to improve the reliability of charging the electric boat, in some examples, a second blocking diode 9 is also included; the positive electrode of the second blocking diode 9 is connected to the first output end of the second DC-DC converter 8; the negative electrode of the second blocking diode 9 is used to be connected to the first input end of the second charging gun; the first output end of the second DC-DC converter 8 is the positive electrode.

[0043] The anode of the second blocking diode 9 is connected to the anode of the second DC-DC converter 8 , and the cathode of the second blocking diode 9 is used to be connected to the first input end of the second charging gun.

[0044] In some examples, the first DC-DC converter 4 is connected to two isolated 1100V busbars through the first blocking diode 5, and the second DC-DC converter 8 is connected to two isolated 1100V busbars through the second blocking diode 9, forming two independent 250V-1000V, 0-400A outputs, which are respectively connected to the first charging gun and the second charging gun, thereby forming two isolated and independently controlled 400A charging power supplies.

[0045] In some embodiments, a first relay 10 and a second relay 11 are further included.

[0046] A first end of the first relay 10 is connected to a first output end of the first DC-DC converter 4; a second end of the first relay 10 is connected to a first output end of the second DC-DC converter 8; a first end of the second relay 11 is connected to a second output end of the first DC-DC converter 4; a second end of the second relay 11 is connected to a second output end of the second DC-DC converter 8.

[0047] The first relay 10 and the second relay 11 in this embodiment can be high-current DC relays. When only one charging gun is working, the first relay 10 and the second relay 11 are closed to form a 600A supercharge. When two charging guns are working at the same time, the first relay 10 and the second relay 11 are disconnected to form two mutually isolated and independently controlled dual 400A supercharge power sources. Since the supercharge time is short and the utilization rate is low, and the probability of two guns working at high power at the same time is even lower, and the phase-shifting transformer 1 has a short-term overload capacity, the transformer can be configured according to 500kVA to achieve the function of two 600A supercharges, which significantly saves the investment in power modules and grid capacity.

[0048] In some examples, the invention further includes: an inner shell and an outer shell.

[0049] The inner shell is provided with a first rectifier 2, a second rectifier 3, a third rectifier 6, a fourth rectifier 7, a first DC-DC converter 4 and a second DC-DC converter 8; the outer shell is provided with an inner shell; and the phase-shifting transformer 1 is provided between the outer shell and the inner shell.

[0050] In this embodiment, the first rectifier 2, the second rectifier 3, the third rectifier 6, the fourth rectifier 7, the first DC-DC converter 4 and the second DC-DC converter 8 are installed in the inner housing, and the inner housing and the phase-shifting transformer 1 are installed in the same transformer cabinet.

[0051] In some examples, the inner housing is a liquid-cooled chassis, which intelligently dissipates heat through a liquid-to-air heat exchanger and a temperature-controlled fan, and the exhaust air of the fan also provides forced air cooling for the transformer.

[0052] In the prior art, the full load efficiency caused by the use of active power factor correction and isolated DC-DC converter is about 96%. When connected to 10kV through a distribution transformer, the efficiency is reduced to 94% due to the loss of the 380V distribution line and the loss of the distribution transformer. In this embodiment, a phase-shifting transformer 1 and multiple rectifiers are used to achieve step-down, isolation and power factor correction, and a non-isolated DC-DC converter is used to achieve charging control. The 600kW dual-gun dynamic distribution 10kV input system occupies an area of ​​about 1 square meter, with a full load efficiency of 97% and a half-load efficiency of 98.5%, which effectively reduces the cost.

[0053] The present application provides a charging pile, including: a power module, a first charging gun and a second charging gun.

[0054] The power module of this embodiment is the corresponding dual-gun charging power module in the aforementioned embodiment. The first input of the first charging gun is connected to the first output end of the first DC-DC converter; the second input of the first charging gun is connected to the second output end of the first DC-DC converter; the first input of the second charging gun is connected to the first output end of the second DC-DC converter; the second input of the second charging gun is connected to the second output end of the second DC-DC converter.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0056] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0057] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A power module for a charging pile, characterized in that: include: A phase-shifting transformer, wherein an input end of the phase-shifting transformer is used to connect to a power grid; A first rectifier, wherein an input end of the first rectifier is connected to a first output end of the phase-shifting transformer; a second rectifier, wherein an input end of the second rectifier is connected to a second output end of the phase-shifting transformer; and a first output end of the second rectifier is connected to a first output end of the first rectifier; a first DC-DC converter, wherein a first input terminal of the first DC-DC converter is connected to a second output terminal of the first rectifier, and a second input terminal of the first DC-DC converter is connected to a second output terminal of the second rectifier; The first output end of the first DC-DC converter is used to be connected to the first input end of the first charging gun, and the second output end of the first DC-DC converter is used to be connected to the second input end of the first charging gun.

2. The power module according to claim 1, characterized in that: The first DC-DC converter is a non-isolated DC-DC converter.

3. The power module according to claim 1, characterized in that: The second input terminal of the first DC-DC converter and the second output terminal of the first DC-DC converter are the same terminal.

4. The power module according to claim 1, characterized in that: It also includes a first blocking diode; the positive electrode of the first blocking diode is connected to the first output end of the first DC-DC converter; the negative electrode of the first blocking diode is used to be connected to the first input end of the first charging gun; the first output end of the first DC-DC converter is the positive electrode.

5. The power module according to claim 4, characterized in that: Also includes: A third rectifier, wherein an input end of the third rectifier is connected to a third output end of the phase-shifting transformer; a fourth rectifier, wherein an input end of the fourth rectifier is connected to a fourth output end of the phase-shifting transformer; and a first output end of the fourth rectifier is connected to a first output end of the third rectifier; a second DC-DC converter, wherein a first input terminal of the second DC-DC converter is connected to a second output terminal of the third rectifier, and a second input terminal of the second DC-DC converter is connected to a second output terminal of the fourth rectifier; The first output end of the second DC-DC converter is used to be connected to the first input end of the second charging gun, and the second output end of the second DC-DC converter is used to be connected to the second input end of the second charging gun.

6. The power module according to claim 5, characterized in that: It also includes a second blocking diode; the positive electrode of the second blocking diode is connected to the first output end of the second DC-DC converter; the negative electrode of the second blocking diode is used to be connected to the first input end of the second charging gun; the first output end of the second DC-DC converter is the positive electrode.

7. The power module according to claim 6, characterized in that: Also includes a first relay and a second relay; The first end of the first relay is connected to the first output end of the first DC-DC converter; the second end of the first relay is connected to the first output end of the second DC-DC converter; The first end of the second relay is connected to the second output end of the first DC-DC converter; the second end of the second relay is connected to the second output end of the second DC-DC converter.

8. The power module according to claim 7, characterized in that: Also includes: An inner shell, wherein the first rectifier, the second rectifier, the third rectifier, the fourth rectifier, the first DC-DC converter and the second DC-DC converter are arranged; An outer shell, wherein the inner shell is disposed in the outer shell; The phase-shifting transformer is arranged between the outer shell and the inner shell.

9. A charging pile, characterized in that: include: A power module, a first charging gun and a second charging gun; the power module is the power module according to any one of claims 5 to 8; The first input of the first charging gun is connected to the first output end of the first DC-DC converter; the second input of the first charging gun is connected to the second output end of the first DC-DC converter; The first input of the second charging gun is connected to the first output end of the second DC-DC converter; the second input of the second charging gun is connected to the second output end of the second DC-DC converter.

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