Charging circuit and charging pile with adjustable DC voltage

Abstract

The utility model relates to a charging circuit and a charging pile with adjustable DC voltage, and the circuit includes: a first charging gun, which is used to connect to a device to be charged to determine the charging voltage value required for charging; a first charging unit, which is used to output a DC voltage; a second charging unit, which is used to output a DC voltage; and an output control unit, which is used to control the first charging unit and / or the second charging unit to be connected in parallel with the first charging gun when the charging voltage value is not greater than the set voltage, so as to input a DC voltage not greater than the set voltage to the device to be charged, and to control the first charging unit to be connected in series with the second charging unit and then connected in parallel with the first charging gun when the charging voltage value is greater than the set voltage, so as to input a DC voltage greater than the set voltage to the device to be charged. The utility model can meet both low-voltage charging and high-voltage charging requirements, and realizes flexible control of the charging voltage.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile chargers, in particular to a charging circuit and a charging pile with adjustable direct current voltage. Background Art

[0002] With the promotion and popularization of pure electric vehicles, fast charging (recharging) is a rigid demand, and DC 1000V, 1500V and higher high-voltage batteries have gradually become popular. However, the DC voltage output in conventional chargers generally ranges from DC50 to 1000V, which cannot take into account the charging needs of high-voltage batteries above DC1000V. In other words, existing chargers cannot meet the needs of different DC voltage levels at the same time. At present, there is an urgent need for a charging device that can meet both low-voltage charging and high-voltage charging needs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a charging circuit and a charging pile with adjustable DC voltage.

[0004] The technical solution adopted by the utility model to solve the technical problem is: constructing a charging circuit with adjustable DC voltage, comprising:

[0005] The first charging gun is used to connect to the device to be charged to determine the charging voltage value required for charging;

[0006] A first charging unit, configured to output a DC voltage;

[0007] A second charging unit, used for outputting a DC voltage;

[0008] An output control unit is connected to the first charging gun, the first charging unit and the second charging unit, and is used to control the first charging unit and / or the second charging unit to be connected in parallel with the first charging gun when the charging voltage value is not greater than the set voltage, so as to input a DC voltage not greater than the set voltage to the device to be charged, and to control the first charging unit to be connected in series with the second charging unit and then connected in parallel with the first charging gun when the charging voltage value is greater than the set voltage, so as to input a DC voltage greater than the set voltage to the device to be charged.

[0009] Preferably, the output control unit comprises:

[0010] a fifth switch connected between the negative output terminal of the first charging unit and the positive output terminal of the second charging unit;

[0011] a sixth switch, one end of which is connected to the positive output end of the first charging unit and the positive electrode of the first charging gun, and the other end of which is connected to the positive output end of the second charging unit;

[0012] a seventh switch connected between the negative electrode of the first charging gun and the negative output end of the second charging unit;

[0013] The second switch is connected between the negative electrode of the first charging gun and the negative output end of the first charging unit.

[0014] Preferably, the charging circuit further includes:

[0015] a second charging gun, whose positive electrode is connected to the positive output end of the first charging unit via the sixth switch, and whose negative electrode is connected to the negative output end of the second charging unit;

[0016] Furthermore, the output control unit further comprises:

[0017] a third switch connected between the positive electrode of the second charging gun and the positive output end of the second charging unit;

[0018] a first switch connected between the positive output terminal of the first charging unit and the positive electrode of the first charging gun;

[0019] The fourth switch is connected between the negative output terminal of the second charging unit and the negative electrode of the second charging gun.

[0020] Preferably, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch are DC contactors respectively.

[0021] Preferably, the charging circuit with adjustable DC voltage further includes:

[0022] A switch control module is connected to the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch.

[0023] Preferably, the first charging unit and the second charging unit respectively include a plurality of charging modules;

[0024] Wherein, the plurality of charging modules included in the first charging unit are connected in parallel;

[0025] The plurality of charging modules included in the second charging unit are connected in parallel.

[0026] Preferably, the voltage output by each charging module is in the range of DC50 to 1000V.

[0027] Preferably, the charging circuit with adjustable DC voltage further includes:

[0028] A control switch, the output end of which is connected to the power supply end of each charging module;

[0029] The manual switch has an output end connected to the input end of the control switch, and its input end is used to connect to the mains.

[0030] Preferably, the control switch is an AC contactor, and the manual switch is a circuit breaker.

[0031] The utility model also constructs a charging pile, which comprises the above-mentioned charging circuit with adjustable DC voltage.

[0032] The implementation of the utility model has the following beneficial effects: providing a charging circuit with adjustable DC voltage; controlling the first charging unit and / or the second charging unit to be connected in parallel with the first charging gun through the output control unit when the charging voltage value is not greater than the set voltage, so as to input a DC voltage not greater than the set voltage to the device to be charged, and controlling the first charging unit to be connected in series with the second charging unit and then connected in parallel with the first charging gun when the charging voltage value is greater than the set voltage, so as to input a DC voltage greater than the set voltage to the device to be charged; the utility model can meet the needs of both low-voltage charging (such as charging below DC1000V) and high-voltage charging (such as charging above DC1000V), not only realizing flexible control of the charging voltage, but also solving the needs of high-voltage battery charging of new energy vehicles, and the utility model also has the advantage of simple circuit structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0034] Figure 1 It is a circuit schematic diagram of a charging circuit with adjustable DC voltage in some embodiments of the utility model;

[0035] Figure 2 It is a circuit schematic diagram of a charging circuit with adjustable DC voltage in other embodiments of the utility model. DETAILED DESCRIPTION

[0036] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0037] Figure 1 The circuit schematic diagram of a charging circuit with adjustable DC voltage in some embodiments of the utility model can be used to inflate an electric vehicle and can adjust and provide a DC voltage according to different DC voltage requirements of the electric vehicle, such as providing a DC voltage below DC1000V and above DC1000V. Figure 1 As shown, the charging circuit includes a first charging gun 41 , a first charging unit 10 , a second charging unit 20 and an output control unit 30 .

[0038] The first charging gun 41 is used to connect to the device to be charged to determine the charging voltage value required for charging the device to be charged. Specifically, after the first charging gun 41 is connected to the device to be charged (i.e., the electric car), the energy output by the charging circuit can be transferred to the device to be charged, so the existing charging gun can be used in this embodiment. It should be noted that the determination of the DC voltage required for the device to be charged can be checked by the existing charging controller (it should be noted that the existing charging controllers are all equipped with a charging voltage detection function). Of course, the battery voltage of the device to be charged can also be determined by the existing voltage measurement module or device, thereby determining the charging voltage value required for charging the device to be charged, and no specific restrictions are made here.

[0039] The first charging unit 10 is used to output a DC voltage.

[0040] Furthermore, if Figure 1 As shown, the first charging unit 10 may include a plurality of charging modules, and the charging modules included in the first charging unit 10 are connected in parallel with each other. It is understandable that the more the number of charging modules is, the greater the maximum output current of the first charging unit 10 is.

[0041] Optionally, the first charging unit 10 includes four charging modules. Furthermore, the charging module may be an existing charging circuit or module capable of converting an AC voltage into a DC voltage. In addition, the output voltage of each charging module may be DC50-1000V.

[0042] The second charging unit 20 is used to output a DC voltage.

[0043] Furthermore, if Figure 1 As shown, the second charging unit 20 may include a plurality of charging modules, and the charging modules included in the second charging unit 20 are connected in parallel with each other. Specifically, the model of the charging module constituting the second charging unit 20 may be consistent with that of the first charging unit 10, so that the second charging unit 20 and the first charging unit 10 can output a DC voltage of similar or even equal magnitude, so that the second charging unit 20 and the first charging unit 10 can output a stable and reliable power supply after being connected in parallel. In addition, the number of charging modules included in the second charging unit 20 may also be 4, so that the second charging unit 20 and the first charging unit 10 can output the same charging power.

[0044] The output control unit 30 is connected to the first charging gun 41, the first charging unit 10 and the second charging unit 20. The output control unit 30 is used to control the first charging unit 10 and / or the second charging unit 20 to be connected in parallel with the first charging gun 41 when the charging voltage value is not greater than the set voltage, so as to input a DC voltage not greater than the set voltage to the device to be charged. The output control unit 30 is also used to control the first charging unit 10 to be connected in series with the second charging unit 20 and then connected in parallel with the first charging gun 41 when the charging voltage value is greater than the set voltage, so as to input a DC voltage greater than the set voltage to the device to be charged.

[0045] Specifically, when the charging voltage value is not greater than the set voltage, under the action of the output control unit 30, if only the first charging unit 10 is connected in parallel with the first charging gun 41, only the first charging unit 10 provides a DC voltage to the first charging gun 41; if only the second charging unit 20 is connected in parallel with the first charging gun 41, only the second charging unit 20 provides a DC voltage to the first charging gun 41; if the first charging unit 10 and the second charging unit 20 are connected in parallel with the first charging gun 41 at the same time, the first charging unit 10 and the second charging unit 20 simultaneously provide a DC voltage to the first charging gun 41, which is equivalent to capacity expansion, that is, increasing the maximum charging current output by the charging circuit, so that the device to be charged can achieve high-current fast charging. It can be understood that the first charging unit 10 and the second charging unit 20 can be each other's backup chargers, so that when one of the charging units fails, the other charging unit can be replaced, and when the device to be charged needs high-current fast charging, the two charging units can work at the same time to achieve fast charging.

[0046] When the charging voltage value is greater than the set voltage, it means that a single charging unit can no longer meet the charging voltage requirement of the device to be charged. At this time, the output control unit 30 will control the first charging unit 10 and the second charging unit 20 to be connected in series first, so as to increase or even double the output voltage, so that the first charging gun 41 can output a DC voltage higher than the set voltage to charge the device to be charged.

[0047] It can be understood that the set voltage can be determined by the maximum DC voltage that can be output by the first charging unit 10 and the second charging unit 20. For example, if the DC voltage range output by the first charging unit 10 and the second charging unit 20 is DC50~1000V, then the set voltage can be equal to DC1000V. Furthermore, the first charging unit 10 and the second charging unit 20 can output a maximum of DC2000V after being connected in series, that is, the utility model can provide a charging voltage of up to twice the DC voltage.

[0048] It can be understood that in this embodiment, when the charging voltage value is not greater than the set voltage, the output control unit controls the first charging unit and / or the second charging unit to be connected in parallel with the first charging gun to input a DC voltage not greater than the set voltage to the device to be charged, and when the charging voltage value is greater than the set voltage, the first charging unit and the second charging unit are controlled to be connected in series and then connected in parallel with the first charging gun to input a DC voltage greater than the set voltage to the device to be charged. This embodiment can meet the needs of both low-voltage charging (such as charging below DC1000V) and high-voltage charging (such as charging above DC1000V), not only realizing flexible control of the charging voltage, but also solving the needs of high-voltage battery charging of new energy vehicles, and this embodiment also has the advantage of simple circuit structure.

[0049] In some embodiments, Figure 1 As shown, the output control unit 30 includes a fifth switch 35 , a sixth switch 36 , a seventh switch 37 and a second switch 32 .

[0050] The fifth switch 35 is connected between the negative output end of the first charging unit 10 and the positive output end of the second charging unit 20, one end of the sixth switch 36 is connected to the positive output end of the first charging unit 10 and the positive pole of the first charging gun 41, the other end of the sixth switch 36 is connected to the positive output end of the second charging unit 20, the seventh switch 37 is connected between the negative pole of the first charging gun 41 and the negative output end of the second charging unit 20, and the second switch 32 is connected between the negative pole of the first charging gun 41 and the negative output end of the first charging unit 10.

[0051] See also Figure 1 In this embodiment, when the fifth switch 35, the sixth switch 36 and the seventh switch 37 are disconnected and the second switch 32 is closed, it is equivalent to that the first charging unit 10 is connected in parallel with the first charging gun 41; when the fifth switch 35 and the second switch 32 are disconnected and the sixth switch 36 and the seventh switch 37 are closed, it is equivalent to that the second charging unit 20 is connected in parallel with the first charging gun 41; when the fifth switch 35 is disconnected and the second switch 32, the sixth switch 36 and the seventh switch 37 are closed, it is equivalent to that the first charging unit 10 and the second charging unit 20 are respectively connected in parallel with the first charging gun 41; when the sixth switch 36 and the second switch 32 are disconnected and the fifth switch 35 and the seventh switch 37 are closed, it is equivalent to that the first charging unit 10 and the second charging unit 20 are connected in series and then connected in parallel with the first charging gun 41.

[0052] In some embodiments, Figure 2As shown, the charging circuit further includes a second charging gun 42, and the output control unit 30 further includes a third switch 33, a first switch 31 and a fourth switch 34. The positive electrode of the second charging gun 42 is connected to the positive output terminal of the first charging unit 10 via the sixth switch 36, and the negative electrode thereof is connected to the negative output terminal of the second charging unit 20. The third switch 33 is connected between the positive electrode of the second charging gun 42 and the positive output terminal of the second charging unit 20, the first switch 31 is connected between the positive output terminal of the first charging unit 10 and the positive electrode of the first charging gun 41, and the fourth switch 34 is connected between the negative output terminal of the second charging unit 20 and the negative electrode of the second charging gun 42.

[0053] Specifically, when the first charging gun 41 is only connected in parallel with the first charging unit 10, by controlling the third switch 33 and the fourth switch 34 to be closed, the second charging unit 20 can be connected in parallel with the second charging gun 42, so that the second charging gun 42 can output a DC voltage to another device to be charged to charge it. It can be understood that the implementation of this embodiment can make the charging circuit output two sets of DC voltages and charge two devices to be charged at the same time, which can improve the utilization rate of circuit resources. Moreover, after adding the third switch 33, the second charging gun 42 can also output a charging voltage higher than the set voltage, specifically: control the second switch 32, the third switch 33 and the seventh switch 37 to be disconnected, and the fifth switch 35, the sixth switch 36 and the fourth switch 34 to be closed, so that the first charging unit 10 and the second charging unit 20 can be connected in series and then form a parallel structure with the second charging gun 42. Furthermore, the function of the first switch 31 is to control whether the first charging gun 41 forms a power circuit with the output control unit 30, that is, to control whether the first charging gun 41 outputs a charging voltage; and the function of the fourth switch 34 is to control whether the second charging gun 42 forms a power circuit with the output control unit 30, that is, to control whether the second charging gun 42 outputs a charging voltage. In addition, the second charging gun 42 can use a charging gun of the same model as the first charging gun 41.

[0054] It should be noted that the positive poles of the several charging modules included in the first charging unit 10 correspond to the positive output end of the first charging unit 10 after being connected, and the negative poles of the several charging modules included in the first charging unit 10 correspond to the negative output end of the first charging unit 10 after being connected; the positive poles of the several charging modules included in the second charging unit 20 correspond to the positive output end of the second charging unit 20 after being connected, and the negative poles of the several charging modules included in the first charging unit 10 correspond to the negative output end of the second charging unit 20 after being connected.

[0055] In some embodiments, the first switch 31, the second switch 32, the third switch 33, the fourth switch 34, the fifth switch 35, the sixth switch 36 and the seventh switch 37 are DC contactors respectively. Of course, the first to seventh switches 37 can also be replaced by existing relays or switch circuits composed of power switch tubes, as long as the opening and closing actions can be realized on the circuits where the corresponding switches (including the first to seventh switches) are located.

[0056] In some embodiments, the charging circuit further includes a switch control module (not shown). The switch control module is connected to the first switch 31, the second switch 32, the third switch 33, the fourth switch 34, the fifth switch 35, the sixth switch 36 and the seventh switch 37, and the switch control module is used to control the opening and closing of the first switch 31, the second switch 32, the third switch 33, the fourth switch 34, the fifth switch 35, the sixth switch 36 and the seventh switch 37 respectively. Specifically, if the first to seventh switches are DC contactors, then the switch control module may include a PLC controller, and the PLC controller may be connected to the excitation coil of each DC contactor to control whether the relevant coil is excited, thereby realizing the control of the opening and closing of the first to seventh switches; of course, if the first to seventh switches are existing switch circuits composed of power switch tubes, then the switch control module may be a host computer, and by executing existing algorithms, such as outputting high and low levels or communicating, it can also control the opening and closing of the first to seventh switches. In other words, the switch control module may be a host computer or composed of devices such as processors and microprocessors, as long as it can control the first to seventh switches to be opened and closed, and no specific restrictions are made here.

[0057] In some embodiments, Figure 1 or Figure 2 As shown, the charging circuit also includes a control switch 2 and a manual switch 1. The output end of the control switch 2 is connected to the power supply end of each charging module, the output end of the manual switch 1 is connected to the input end of the control switch 2, and the input end of the manual switch 1 is used to connect to the mains (such as three-phase mains).

[0058] In some embodiments, the control switch 2 can be an AC contactor, and the three-phase output end of the AC contactor serves as the output end of the control switch 2 and is connected to the power supply end of each charging module. The three-phase input end of the AC contactor serves as the input end of the control switch 2 and is connected to the manual switch 1. The excitation coil of the AC contactor is connected to the control module so that the control module can control the opening and closing state of the control switch 2.

[0059] Optionally, the manual switch 1 is a circuit breaker.

[0060] The utility model also provides a charging pile, comprising a charging circuit with adjustable DC voltage provided in an embodiment of the utility model.

[0061] It can be understood that the above embodiments only express the preferred implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the patent scope of the utility model. It should be pointed out that, for ordinary technicians in this field, without departing from the concept of the utility model, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the utility model. Therefore, all equivalent changes and modifications made to the scope of the claims of the utility model should belong to the scope covered by the claims of the utility model.

Claims

1. A charging circuit with adjustable DC voltage, characterized in that: include: A first charging gun (41) is used to connect to a device to be charged to determine a charging voltage value required for charging the device; A first charging unit (10) configured to output a DC voltage; A second charging unit (20), configured to output a DC voltage; an output control unit (30), connected to the first charging gun (41), the first charging unit (10) and the second charging unit (20), and configured to control the first charging unit (10) and / or the second charging unit (20) to be connected in parallel with the first charging gun (41) when the charging voltage value is not greater than a set voltage, so as to input a DC voltage not greater than the set voltage to the device to be charged, and to control the first charging unit (10) to be connected in series with the second charging unit (20) and then connected in parallel with the first charging gun (41) when the charging voltage value is greater than the set voltage, so as to input a DC voltage greater than the set voltage to the device to be charged; Wherein, the output control unit (30) comprises: a fifth switch (35), connected between the negative output terminal of the first charging unit (10) and the positive output terminal of the second charging unit (20); a sixth switch (36), one end of which is connected to the positive output end of the first charging unit (10) and the positive electrode of the first charging gun (41), and the other end of which is connected to the positive output end of the second charging unit (20); a seventh switch (37), connected between the negative electrode of the first charging gun (41) and the negative output end of the second charging unit (20); The second switch (32) is connected between the negative electrode of the first charging gun (41) and the negative output end of the first charging unit (10).

2. The charging circuit with adjustable DC voltage according to claim 1, characterized in that: The charging circuit further comprises: a second charging gun (42), the positive electrode of which is connected to the positive output end of the first charging unit (10) via the sixth switch (36), and the negative electrode of which is connected to the negative output end of the second charging unit (20); Furthermore, the output control unit (30) further comprises: a third switch (33) connected between the positive electrode of the second charging gun (42) and the positive output end of the second charging unit (20); A first switch (31) connected between the positive output terminal of the first charging unit (10) and the positive electrode of the first charging gun (41); The fourth switch (34) is connected between the negative output end of the second charging unit (20) and the negative pole of the second charging gun (42).

3. The charging circuit with adjustable DC voltage according to claim 2, characterized in that: The first switch (31), the second switch (32), the third switch (33), the fourth switch (34), the fifth switch (35), the sixth switch (36) and the seventh switch (37) are respectively DC contactors.

4. The charging circuit with adjustable DC voltage according to claim 2, characterized in that: Also includes: A switch control module is connected to the first switch (31), the second switch (32), the third switch (33), the fourth switch (34), the fifth switch (35), the sixth switch (36) and the seventh switch (37).

5. The charging circuit with adjustable DC voltage according to any one of claims 1 to 4, characterized in that: The first charging unit (10) and the second charging unit (20) respectively comprise a plurality of charging modules; Wherein, the plurality of charging modules included in the first charging unit (10) are connected in parallel; The plurality of charging modules comprised by the second charging unit (20) are connected in parallel.

6. The charging circuit with adjustable DC voltage according to claim 5, characterized in that: The voltage output by each charging module is in the range of DC50~1000V.

7. The charging circuit with adjustable DC voltage according to claim 5, characterized in that: Also includes: A control switch (2), the output end of which is connected to the power supply end of each charging module; The manual switch (1) has an output end connected to the input end of the control switch (2), and the input end is used to connect to the mains.

8. The charging circuit with adjustable DC voltage according to claim 7, characterized in that: The control switch (2) is an AC contactor, and the manual switch (1) is a circuit breaker.

9. A charging pile, characterized in that: A charging circuit with adjustable DC voltage comprising the charging circuit as claimed in any one of claims 1 to 8.

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