An AC charging pile and charging method compatible with three-phase electricity and single-phase electricity

Abstract

The present invention provides an AC charging pile and a charging method compatible with three-phase electricity and single-phase electricity in the technical field of AC charging piles. The charging pile includes a control detection module, an ACDC power supply module, and a charging gun; the control detection module includes an MCU, a switching switch, a power supply detection unit, a CP detection unit, a first relay, and a second relay; the MCU is connected to the switching switch, the power supply detection unit, the CP detection unit, the first relay, the second relay, and the ACDC power supply module; the ACDC power supply module is connected to the power supply detection unit and the CP detection unit; the output end of the first relay is connected to the pins A and N of the charging gun; the output end of the second relay is connected to the pins B and C of the charging gun; the pin PE of the charging gun is used to connect the grounding end of the power grid; the CP detection unit is connected to the charging gun; the power supply detection unit is used to connect the A phase electricity, the B phase electricity, the C phase electricity and the neutral line of the power grid. The advantages of the present invention are: the compatibility of the AC charging pile is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of AC charging piles, and in particular to an AC charging pile and a charging method that are compatible with three-phase electricity and single-phase electricity. Background Art

[0002] With the rapid development of new energy, more and more automobile manufacturers have begun to develop new energy vehicles, and more and more people have begun to choose to buy more energy-saving and environmentally friendly new energy vehicles. The construction of charging piles is an important guarantee for the popularization of new energy vehicles.

[0003] Charging piles are divided into DC charging piles and AC charging piles. AC charging piles have low power and slow charging, and their cost is much lower than that of DC charging piles. Therefore, individuals can purchase their own set of AC charging piles at a lower cost.

[0004] AC charging piles are divided into three-phase piles and single-phase piles. Due to historical reasons, most old communities cannot meet the needs of three-phase power access. Only newly built communities are equipped with both single-phase and three-phase power. New energy vehicles are flourishing. Some models support charging with three-phase and single-phase power, while some models only support charging with single-phase power. Therefore, individuals often encounter incompatibility issues after purchasing AC charging piles for installation.

[0005] Therefore, how to provide an AC charging pile and charging method that is compatible with three-phase electricity and single-phase electricity to improve the compatibility of the AC charging pile has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide an AC charging pile and a charging method that are compatible with three-phase electricity and single-phase electricity, so as to improve the compatibility of the AC charging pile.

[0007] In a first aspect, the present invention provides an AC charging pile compatible with three-phase electricity and single-phase electricity, including a control detection module, an ACDC power supply module and at least one charging gun;

[0008] The control detection module includes an MCU, a switch, a power detection unit, a CP detection unit, a first relay and a second relay;

[0009] The MCU is respectively connected to the switching switch, the power detection unit, the CP detection unit, the first relay, the second relay and the output end of the ACDC power module; the input end of the ACDC power module is used to connect the A phase electricity and the neutral line of the power grid, and the output end is connected to the power detection unit and the CP detection unit; the input end of the first relay is used to connect the A phase electricity and the neutral line of the power grid, and the output end is connected to the pins A and N of the charging gun; the input end of the second relay is used to connect the B phase electricity and the C phase electricity of the power grid, and the output end is connected to the pins B and C of the charging gun; the pin PE of the charging gun is used to connect the ground terminal of the power grid; the CP detection unit is connected to the charging gun; the power detection unit is used to connect the A phase electricity, B phase electricity, C phase electricity and the neutral line of the power grid.

[0010] Further, the power supply detection unit is provided with a voltage detection subunit, a current detection subunit, a phase detection subunit and a phase sequence detection subunit;

[0011] The voltage detection subunit, the current detection subunit, the phase detection subunit and the phase sequence detection subunit are all connected to the MCU.

[0012] Furthermore, it also includes an audible and visual alarm connected to the MCU and the ACDC power supply module.

[0013] In a second aspect, the present invention provides a charging method compatible with three-phase electricity and single-phase electricity, comprising the following steps:

[0014] Step S10, the ACDC power supply module converts the single-phase AC power of the power grid into DC power and supplies power to the control detection module;

[0015] Step S20: The MCU controls the operation of the first relay and the second relay based on the signal triggered by the switching switch, thereby controlling the charging gun to charge the new energy vehicle with single-phase or three-phase electricity.

[0016] Step S30: During the charging process, the MCU performs real-time detection of the power supply connected to the grid through the power supply detection unit.

[0017] Furthermore, the step S20 specifically includes the following steps in no particular order:

[0018] Step S21: The MCU closes the first relay and disconnects the second relay based on the single-phase charging signal triggered by the switch, and the charging gun charges the new energy vehicle through the A-phase electricity;

[0019] Step S22: The MCU closes the first relay and the second relay based on the three-phase charging signal triggered by the switching switch, and the charging gun charges the new energy vehicle through the A-phase electricity, the B-phase electricity and the C-phase electricity;

[0020] The MCU detects whether there is input current in the B-phase power and C-phase power connected to the second relay through the current detection subunit. If so, the new energy vehicle continues to be charged through the A-phase power, B-phase power and C-phase power; if not, the second relay is disconnected and the charging gun charges the new energy vehicle through the A-phase power.

[0021] Furthermore, the step S30 is specifically as follows:

[0022] During the charging process, the MCU detects the charging voltage in real time through the voltage detection subunit, detects the charging current in real time through the current detection subunit, detects the phase of the three-phase electricity in real time through the phase detection subunit, and detects the phase sequence of the three-phase electricity in real time through the phase sequence detection subunit, and determines whether there is an abnormality in the charging voltage, charging current, phase or phase sequence. If not, charging continues; if so, the first relay and the second relay are disconnected to stop charging the new energy vehicle.

[0023] The advantages of the present invention are:

[0024] A first relay is set to switch on and off A-phase electricity and the neutral line, and a second relay is set to switch on and off B-phase electricity and C-phase electricity, and both the first relay and the second relay are connected to the MCU, a power detection unit including a voltage detection subunit, a current detection subunit, a phase detection subunit and a phase sequence detection subunit is set to connect the MCU, A-phase electricity, B-phase electricity, C-phase electricity and the neutral line, and the MCU is set to be connected to a switching switch for switching between single-phase charging and three-phase charging. The MCU controls the switching of the first relay and the second relay based on a signal triggered by the switching switch to allow the charging gun to output single-phase electricity or three-phase electricity, and during the charging process, the charging voltage, charging current, phase and phase sequence are detected in real time by the power detection unit to determine whether there is an abnormality. If an abnormality occurs, the first relay and the second relay are immediately disconnected, ultimately making the AC charging pile compatible with single-phase charging and three-phase charging, and automatically cutting off the power when an abnormality occurs, thereby greatly improving the compatibility and safety of the AC charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0026] Figure 1 The present invention is a circuit principle block diagram of an AC charging pile compatible with three-phase electricity and single-phase electricity.

[0027] Figure 2 It is a circuit principle block diagram of the MCU of the present invention.

[0028] Figure 3 The present invention is a flow chart of a charging method compatible with three-phase electricity and single-phase electricity.

[0029] Marking Description:

[0030] 100-An AC charging pile compatible with three-phase electricity and single-phase electricity, 1-control detection module, 2-ACDC power module, 3-charging gun, 11-MCU, 12-switching switch, 13-power detection unit, 14-CP detection unit, 15-first relay, 16-second relay, 17-sound and light alarm, 131-voltage detection subunit, 132-current detection subunit, 133-phase detection subunit, 134-phase sequence detection subunit. DETAILED DESCRIPTION

[0031] The technical solution in the embodiment of the present application has the following overall idea: a first relay 15 is set to switch on and off the A-phase power and the neutral line, and a second relay 16 is set to switch on and off the B-phase power and the C-phase power, and the first relay 15 and the second relay 16 are both connected to the MCU 11, and the MCU 11 is set to be connected to the switching switch 12. The MCU 11 controls the switching of the first relay 15 and the second relay 16 based on the signal triggered by the switching switch 12, so that the charging gun 3 can output single-phase power or three-phase power, so as to improve the compatibility of the AC charging pile 100.

[0032] Please refer to Figures 1 to 3 As shown, a preferred embodiment of an AC charging pile 100 compatible with three-phase electricity and single-phase electricity of the present invention includes a control detection module 1, an ACDC power supply module 2 and at least one charging gun 3; the control detection module 1 is used to control the operation of the AC charging pile 100; the ACDC power supply module 2 is used to convert the single-phase AC power input from the power grid into DC power to power the control detection module 1; the charging gun 3 is used to connect to a new energy vehicle (not shown), thereby charging the new energy vehicle and communicating with the new energy vehicle;

[0033] The control detection module 1 includes an MCU 11, a switching switch 12, a power detection unit 13, a CP detection unit 14, a first relay 15 and a second relay 16; the MCU 11 is used to control the operation of the AC charging pile 100. In the specific implementation, it is sufficient to select an MCU that can realize this function from the prior art, and it is not limited to any model, such as the STM32F103 series MCU of ST Company, and the control program is well known to those skilled in the art, which can be obtained by those skilled in the art without creative labor; the switching switch 12 is used to switch between single-phase charging and three-phase charging; the power detection unit 13 is used to The charging voltage, charging current, phase and phase sequence of the input power supply are detected; the CP detection unit 14 is used to detect the PWM signal of the new energy vehicle, or send a PWM signal to the new energy vehicle, and then communicate with the new energy vehicle. In the specific implementation, it is only necessary to select a device that can realize this function from the prior art, and it is not limited to any model. For example, an AC charging device CP control guide signal driving and acquisition circuit disclosed in application number CN201910879005.9 can be obtained by those skilled in the art without creative labor; the first relay 15 is used to switch on and off the A phase power and the neutral line; the second relay 16 is used to switch on and off the B phase power and the C phase power;

[0034] The MCU11 is respectively connected to the switching switch 12, the power detection unit 13, the CP detection unit 14, the first relay 15, the second relay 16 and the output end of the ACDC power module 2; the input end of the ACDC power module 2 is used to connect the A phase electricity and the neutral line of the power grid, and the output end is connected to the power detection unit 13 and the CP detection unit 14; the input end of the first relay 15 is used to connect the A phase electricity and the neutral line of the power grid, and the output end is connected to the pins A and N of the charging gun 3; the input end of the second relay 16 is used to connect the B phase electricity and the C phase electricity of the power grid, and the output end is connected to the pins B and C of the charging gun 3; the pin PE of the charging gun 3 is used to connect the ground terminal of the power grid; the CP detection unit 14 is connected to the charging gun 3; the power detection unit 13 is used to connect the A phase electricity, the B phase electricity, the C phase electricity and the neutral line of the power grid. Figure 1 The pins A, B, C, N, and PE of the power grid represent phase A power, phase B power, phase C power, neutral line, and ground respectively.

[0035] The power detection unit 13 is provided with a voltage detection subunit 131, a current detection subunit 132, a phase detection subunit 133 and a phase sequence detection subunit 134; the voltage detection subunit 131 is used to detect the charging voltage, the current detection subunit 132 is used to detect the charging current, the phase detection subunit 133 is used to detect the phase of the three-phase electricity, and the phase sequence detection subunit 134 is used to detect the phase sequence of the three-phase electricity. In the specific implementation, it is sufficient to select a device that can realize the corresponding function from the prior art, and it is not limited to any model. This can be obtained by those skilled in the art without creative labor;

[0036] The voltage detection subunit 131 , the current detection subunit 132 , the phase detection subunit 133 , and the phase sequence detection subunit 134 are all connected to the MCU 11 .

[0037] It also includes an audible and visual alarm 17 connected to the MCU 11 and the ACDC power module 2 for alarming when an abnormality occurs in the AC charging pile 100 .

[0038] A preferred embodiment of a charging method compatible with three-phase electricity and single-phase electricity of the present invention comprises the following steps:

[0039] Step S10, the ACDC power module converts the single-phase AC power of the power grid into DC power, and then supplies power to the MCU, CP detection unit and sound and light alarm of the control detection module;

[0040] Step S20: The MCU controls the operation of the first relay and the second relay based on the signal triggered by the switching switch, thereby controlling the charging gun to charge the new energy vehicle with single-phase or three-phase electricity.

[0041] Step S30: During the charging process, the MCU performs real-time detection of the power supply connected to the grid through the power supply detection unit.

[0042] The step S20 specifically includes the following steps in no particular order:

[0043] Step S21, the MCU closes the first relay and disconnects the second relay based on the single-phase charging signal triggered by the switching switch, and the charging gun charges the new energy vehicle through the A-phase power; when the MCU receives the single-phase charging signal, even if the AC charging pile is connected to the power grid through three-phase power and the new energy vehicle also supports three-phase charging, the new energy vehicle is only charged through single-phase power at this time, that is, the user can choose to charge through single-phase power or three-phase power as needed;

[0044] Step S22: The MCU closes the first relay and the second relay based on the three-phase charging signal triggered by the switching switch, and the charging gun charges the new energy vehicle through the A-phase electricity, the B-phase electricity and the C-phase electricity;

[0045] The MCU detects whether there is input current in the B-phase and C-phase electricity connected to the second relay through the current detection sub-unit. If so, the new energy vehicle will continue to be charged through the A-phase electricity, B-phase electricity and C-phase electricity; if not, it means that the power grid only supports single-phase electricity, then the second relay will be disconnected, and the charging gun will charge the new energy vehicle through the A-phase electricity.

[0046] The step S30 is specifically as follows:

[0047] During the charging process, the MCU detects the charging voltage in real time through the voltage detection subunit, detects the charging current in real time through the current detection subunit, detects the phase of the three-phase electricity in real time through the phase detection subunit, and detects the phase sequence of the three-phase electricity in real time through the phase sequence detection subunit, and determines whether there is an abnormality in the charging voltage, charging current, phase or phase sequence. If not, continue charging; if so, disconnect the first relay and the second relay, stop charging the new energy vehicle, and alarm through the sound and light alarm. During the charging process, the charging power of the new energy vehicle is calculated in real time through the detected charging voltage and charging current and billed.

[0048] In summary, the advantages of the present invention are:

[0049] A first relay is set to switch on and off A-phase electricity and the neutral line, and a second relay is set to switch on and off B-phase electricity and C-phase electricity, and both the first relay and the second relay are connected to the MCU, a power detection unit including a voltage detection subunit, a current detection subunit, a phase detection subunit and a phase sequence detection subunit is set to connect the MCU, A-phase electricity, B-phase electricity, C-phase electricity and the neutral line, and the MCU is set to be connected to a switching switch for switching between single-phase charging and three-phase charging. The MCU controls the switching of the first relay and the second relay based on a signal triggered by the switching switch to allow the charging gun to output single-phase electricity or three-phase electricity, and during the charging process, the charging voltage, charging current, phase and phase sequence are detected in real time by the power detection unit to determine whether there is an abnormality. If an abnormality occurs, the first relay and the second relay are immediately disconnected, ultimately making the AC charging pile compatible with single-phase charging and three-phase charging, and automatically cutting off the power when an abnormality occurs, thereby greatly improving the compatibility and safety of the AC charging pile.

[0050] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. An AC charging pile compatible with three-phase and single-phase electricity, Features: It includes a control detection module, an ACDC power supply module and at least one charging gun; The control detection module includes an MCU, a switch, a power detection unit, a CP detection unit, a first relay and a second relay; The MCU is respectively connected to the switching switch, the power detection unit, the CP detection unit, the first relay, the second relay and the output end of the ACDC power module; the input end of the ACDC power module is used to connect the A phase electricity and the neutral line of the power grid, and the output end is connected to the power detection unit and the CP detection unit; the input end of the first relay is used to connect the A phase electricity and the neutral line of the power grid, and the output end is connected to the pins A and N of the charging gun; the input end of the second relay is used to connect the B phase electricity and the C phase electricity of the power grid, and the output end is connected to the pins B and C of the charging gun; the pin PE of the charging gun is used to connect the ground terminal of the power grid; the CP detection unit is connected to the charging gun; the power detection unit is used to connect the A phase electricity, the B phase electricity, the C phase electricity and the neutral line of the power grid; The power supply detection unit is provided with a voltage detection subunit, a current detection subunit, a phase detection subunit and a phase sequence detection subunit; The voltage detection subunit, the current detection subunit, the phase detection subunit and the phase sequence detection subunit are all connected to the MCU.

2. An AC charging pile compatible with three-phase electricity and single-phase electricity as claimed in claim 1, Features: It also includes an audible and visual alarm connected to the MCU and the ACDC power supply module.

3. A charging method compatible with three-phase electricity and single-phase electricity, Features: The method requires the use of an AC charging pile as described in any one of claims 1 to 2, and comprises the following steps: Step S10, the ACDC power supply module converts the single-phase AC power of the power grid into DC power and supplies power to the control detection module; Step S20: The MCU controls the operation of the first relay and the second relay based on the signal triggered by the switching switch, thereby controlling the charging gun to charge the new energy vehicle with single-phase or three-phase electricity. Step S30: During the charging process, the MCU performs real-time detection of the power supply connected to the grid through the power supply detection unit.

4. A charging method compatible with three-phase electricity and single-phase electricity as claimed in claim 3, Features: The step S20 specifically includes the following steps in no particular order: Step S21: The MCU closes the first relay and disconnects the second relay based on the single-phase charging signal triggered by the switch, and the charging gun charges the new energy vehicle through the A-phase electricity; Step S22: The MCU closes the first relay and the second relay based on the three-phase charging signal triggered by the switching switch, and the charging gun charges the new energy vehicle through the A-phase electricity, the B-phase electricity and the C-phase electricity; The MCU detects whether there is input current in the B-phase power and C-phase power connected to the second relay through the current detection subunit. If so, the new energy vehicle continues to be charged through the A-phase power, B-phase power and C-phase power; if not, the second relay is disconnected and the charging gun charges the new energy vehicle through the A-phase power.

5. A charging method compatible with three-phase electricity and single-phase electricity as claimed in claim 3, Features: The step S30 is specifically as follows: During the charging process, the MCU detects the charging voltage in real time through the voltage detection subunit, detects the charging current in real time through the current detection subunit, detects the phase of the three-phase electricity in real time through the phase detection subunit, and detects the phase sequence of the three-phase electricity in real time through the phase sequence detection subunit, and determines whether there is an abnormality in the charging voltage, charging current, phase or phase sequence. If not, charging continues; if so, the first relay and the second relay are disconnected to stop charging the new energy vehicle.

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