A circuit for a charger, a charger and a charging method using the charger

Abstract

The present invention discloses a circuit for a charger, a charger and a method for charging using the charger. The circuit includes: a first live wire (L1), a first auxiliary live wire (L1`), a first neutral wire (N1), a first auxiliary neutral wire (N1`), a first ground wire (EARTH1), a first auxiliary ground wire (EARTH1`), an identification signal module, an auxiliary live wire signal detection module, a main controller, a charging protocol controller, an input port and an output port. The embodiment of the present invention determines the output current capability of the charger power supply by detecting whether the voltage difference between the first auxiliary live wire and the first ground wire is greater than a first preset threshold value and detecting whether an IR signal exists, thereby adjusting the charging power of an electric vehicle according to power supplies with different load capacities in different occasions, so that users can charge electric vehicles on different power supplies without worrying about charging failures or safety accidents caused by power mismatch.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging, and in particular relates to a circuit for a charger, a charger and a method for charging using the charger. Background Art

[0002] As petroleum fuels bring negative impacts on the environment, new energy vehicles are gradually becoming popular. New energy vehicles include plug-in hybrid vehicles and pure electric vehicles (hereinafter collectively referred to as electric vehicles). Among them, electric vehicles have the advantages of protecting the environment, saving energy and driving the development of related industries. Therefore, the development speed of electric vehicles has been getting faster and faster in recent years.

[0003] For electric vehicles, the popularity and ease of use of charging equipment are of great concern to users. In order to facilitate charging, many users bring their own portable AC charging equipment with them, which can charge the vehicle directly in places with AC power without having to find charging piles.

[0004] However, since power sources with different load capacities may appear in different situations, if the power source cannot meet the nominal power requirement, safe charging cannot be performed, and when the power source output capacity is greater than the nominal power, the vehicle cannot be charged at a faster speed. Summary of the invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a circuit for a charger, a charger and a method for charging using the charger. The technical problem to be solved by the present invention is achieved by the following technical solutions:

[0006] A circuit for a charger, comprising a first live wire, a first auxiliary live wire, a first neutral wire, a first auxiliary neutral wire, a first ground wire, a first auxiliary ground wire, an identification signal module, an auxiliary live wire signal detection module, a main controller, a charging protocol controller, an input port and an output port, wherein:

[0007] The first ends of the first live wire, the first auxiliary live wire, the first neutral wire, the first auxiliary neutral wire, the first ground wire and the first auxiliary ground wire are connected to the input port, the second ends of the first live wire, the first neutral wire and the first ground wire are connected to the input port, the second end of the first auxiliary live wire is connected between the first live wire and the output port, the second end of the first auxiliary neutral wire is connected between the first neutral wire and the output port, and the second end of the first auxiliary ground wire is connected between the first ground wire and the output port;

[0008] The identification signal module, the identification signal line IR is connected between the input port and the main controller, and is used to detect whether the IR signal exists and output a first detection result;

[0009] The auxiliary live wire signal detection module is connected to the first auxiliary live wire, the first ground wire and the first auxiliary ground wire, and is used to detect whether the voltage difference between the first auxiliary live wire and the first ground wire is greater than a first preset threshold value, and generate a second detection result;

[0010] The main controller is connected to the auxiliary live wire signal detection module and the charging protocol controller, and is used to receive the first detection result and the second detection result, and control the charging protocol controller to generate a CP signal according to the first detection result and the second detection result;

[0011] The charging protocol controller is connected to the output port, and is used to generate the CP signal according to the first detection result and the second detection result.

[0012] In one embodiment of the present invention, the charging protocol controller is specifically configured to generate the CP signal using an H-bridge according to the first detection result and the second detection result.

[0013] In one embodiment of the present invention, it also includes an isolated positive voltage AC / DC connected to the first live wire and the first neutral wire, for providing a positive isolation voltage relative to the secondary circuit ground.

[0014] In one embodiment of the present invention, the charging protocol controller includes a controller module and a resistor, wherein:

[0015] The first inlet and the second inlet of the control circuit chip are both connected to the main controller, the first outlet of the controller module is connected to the output port through the resistor, the second outlet of the controller module is connected to the output port, and the controller circuit is also connected to the positive isolation voltage and the secondary circuit ground.

[0016] In one embodiment of the present invention, it further includes a first switch, a second switch, a third switch, a residual current protector and a voltage and current detection module, wherein:

[0017] The first end of the first switch is connected to the input port through the first live line, the second end of the first switch is connected to the output port through the first live line, the first end of the second switch is connected to the input port through the first auxiliary live line, the second end of the second switch is connected between the second end of the first switch and the output port through the first auxiliary live line, the first end of the third switch is connected to the input port through the first neutral line, the second end of the third switch is connected to the output port through the first neutral line, and the second end of the first auxiliary neutral line is connected between the first neutral line and the first end of the third switch;

[0018] The residual current protector is connected to the main controller and is used to monitor the current difference between the first live wire, the first auxiliary live wire and the first neutral wire;

[0019] The voltage and current detection module is connected between the first live wire and the first end of the first switch, the first ground wire, and is also connected to the main controller, and is used to detect whether the voltage exceeds the second preset threshold and whether the current exceeds the third preset threshold.

[0020] An embodiment of the present invention further provides a charger, comprising any of the above circuits, and also comprising a power line, wherein the power line comprises a second live line, a second neutral line, a second ground line, and a cable input head, wherein:

[0021] The second live wire is connected between the first live wire and the cable input connector, the second neutral wire is connected between the first neutral wire and the cable input connector, and the second ground wire is connected between the first ground wire and the cable input connector.

[0022] In one embodiment of the present invention, the power line further includes a second auxiliary live line, a second auxiliary neutral line and a second auxiliary ground line, wherein:

[0023] The second auxiliary live wire is connected between the second live wire and the cable input terminal, the second auxiliary neutral wire is connected between the second neutral wire and the cable input terminal, and the second auxiliary ground wire is connected between the second ground wire and the cable input terminal.

[0024] In one embodiment of the present invention, the power cable further includes an identification signal line, and the identification signal line is connected between the identification signal module and the cable input head.

[0025] In one embodiment of the present invention, the charger further comprises a main control box, the circuit for the charger is arranged in the main control box, and a temporary grounding hole is arranged on the main control box.

[0026] An embodiment of the present invention further provides a method for charging using a charger, wherein the charger is any one of the chargers described above, and the method comprises:

[0027] Detect whether the voltage difference between the first auxiliary live wire and the first ground wire is greater than a first preset threshold:

[0028] If the voltage difference between the first auxiliary live wire and the first ground wire is greater than a first preset threshold, continue to detect whether the IR signal exists, if yes, charge according to the output current of the first power supply, if no, charge according to the output current of the second power supply;

[0029] If the voltage difference between the first auxiliary live wire and the first ground wire is not greater than the first preset threshold, continue to detect whether the IR signal exists, if yes, charge according to the output current of the third power supply, if no, charge according to the output current of the fourth power supply;

[0030] The currents output by the third power supply output current, the fourth power supply output current, the first power supply output current and the second power supply output current increase in sequence.

[0031] Beneficial effects of the present invention:

[0032] The embodiment of the present invention determines the output current capability of the charger power supply by detecting whether the voltage difference between the first auxiliary live wire and the first ground wire is greater than the first preset threshold value and detecting whether the IR signal exists. Thus, the charging power of the electric vehicle can be adjusted according to power supplies with different load capacities in different occasions, so that the user can charge the electric vehicle on different power supplies without worrying about charging failures or safety accidents caused by power mismatch.

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of a charger provided by an embodiment of the present invention;

[0035] Figure 2 is a flow chart of a method for charging using a charger provided by an embodiment of the present invention;

[0036] Figure 3 is a schematic diagram of a charging protocol controller provided by an embodiment of the present invention;

[0037] Figure 4 It is a structural schematic diagram of a device body provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to specific embodiments, but the embodiments of the present invention are not limited thereto.

[0039] Embodiment 1

[0040] See also Figure 1 , Figure 1 Schematic diagram of a circuit for a charger provided by an embodiment of the present invention. The embodiment of the present invention provides a circuit for a charger, a first live wire L1, a first auxiliary live wire L1', a first neutral wire N1, a first auxiliary neutral wire N1', a first ground wire EARTH1, a first auxiliary ground wire EARTH1', an identification signal module, an auxiliary live wire signal detection module, a main controller, a charging protocol controller, an input port and an output port, wherein:

[0041] The first ends of the first live wire L1, the first auxiliary live wire L1`, the first neutral wire N1, the first auxiliary neutral wire N1`, the first earth wire EARTH1 and the first auxiliary earth wire EARTH1` are connected to the input port, the second ends of the first live wire L1, the first neutral wire N1 and the first earth wire EARTH1 are connected to the input port, the second end of the first auxiliary live wire L1` is connected between the first live wire L1 and the output port, the second end of the first auxiliary neutral wire N1` is connected between the first neutral wire N1 and the output port, and the second end of the first auxiliary earth wire EARTH1` is connected between the first earth wire EARTH1 and the output port;

[0042] The identification signal module, the identification signal line IR is connected between the input port and the main controller, and is used to detect whether the IR signal exists and output a first detection result;

[0043] Specifically, the IR signal is an identification signal, wherein the first detection result includes the presence of the IR signal and the absence of the IR signal.

[0044] The detection of IR signals can be achieved through resistors, and in addition to using resistors, other passive devices or circuits such as thermistors and voltage regulator diodes can also be used, including but not limited to.

[0045] The IR signal can be detected by measuring the voltage generated on the first ground line EARTH1 when the IR current passes through. If the voltage is equal to the power supply voltage, it means there is no IR signal. If the voltage is less than the power supply voltage, it means there is IR.

[0046] The auxiliary live wire signal detection module is connected to the first auxiliary live wire L1', the first ground wire EARTH1 and the first auxiliary ground wire EARTH1', and is used to detect whether the voltage difference between the first auxiliary live wire L1' and the first ground wire EARTH1 is greater than a first preset threshold value, and generate a second detection result;

[0047] The second detection result includes that the voltage difference between the first auxiliary live wire L1' and the first ground wire EARTH1 is greater than the first preset threshold and the voltage difference between the first auxiliary live wire L1' and the first ground wire EARTH1 is not greater than the first preset threshold;

[0048] Among them, the value of the first preset threshold can be set by those skilled in the art according to actual needs and is not specifically limited here.

[0049] The main controller is connected to the auxiliary live wire signal detection module and the charging protocol controller, and is used to receive the first detection result and the second detection result, and output the first detection result and the second detection result to the charging protocol controller;

[0050] Furthermore, the main controller uses MCU (Microcontroller Unit) as a control unit to control peripherals and realize the overall function of the system.

[0051] The charging protocol controller is connected to the output port, and is used to determine the output current capability according to the first detection result and the second detection result, and generate the CP signal.

[0052] Furthermore, the charging protocol used by the charging protocol controller is GB T1878.1-2015, which can communicate with the vehicle in accordance with national standard requirements and usage methods, and report to the vehicle the power output capacity of the charger equipped with the circuit of this embodiment; at the same time, it can monitor the signal fed back by the vehicle to obtain the vehicle status, thereby deciding whether to supply power to the vehicle.

[0053] For further information, see Figure 2 The output current capability can be determined by detecting whether the voltage difference between the first auxiliary live wire L1' and the first ground wire EARTH1 is greater than a first preset threshold:

[0054] If the voltage difference between the first auxiliary live wire L1` and the first ground wire EARTH1 is greater than a first preset threshold, it can be determined that the output current capacity is above a certain set value, for example, the set value is 25A. At this time, continue to detect whether the IR signal exists. If it exists, charge according to the output current of the first power supply. If not, charge according to the output current of the second power supply.

[0055] If the voltage difference between the first auxiliary live wire L1` and the first ground wire EARTH1 is not greater than the first preset threshold, it can be determined that the output current capacity is below a certain set value. At this time, continue to detect whether the IR signal exists. If it exists, charge according to the output current of the third power supply. If it does not exist, charge according to the output current of the fourth power supply.

[0056] The currents output by the third power supply output current, the fourth power supply output current, the first power supply output current and the second power supply output current increase in sequence.

[0057] For example, the current output capacity of the first power supply output current is 16-25A, the current output capacity of the second power supply output current is less than 16A, the current output capacity of the third power supply output current is more than 32A, and the current output capacity of the fourth power supply output current is 25-32A.

[0058] This embodiment determines the ability of the charger's power supply to output current by detecting whether the voltage difference between the first auxiliary live wire and the first ground wire is greater than a first preset threshold value and detecting whether an IR signal exists. This makes it possible to adjust the charging power of the electric vehicle according to power supplies with different load capacities in different occasions, so that users can charge the electric vehicle on different power supplies without having to worry about charging failures or safety accidents caused by power mismatch.

[0059] In one embodiment, the charging protocol controller is specifically configured to generate the CP signal using an H-bridge according to the first detection result and the second detection result.

[0060] Specifically, the CP signal is generated by the charging protocol controller. The CP signal of the unconnected vehicle is an output signal of -12V, 0V, and +12V to the ground without load. Of course, it can also be an output signal of other sizes. This embodiment does not specifically limit this. The circuit of this embodiment can generate a power supply with a positive isolation voltage VDD of +12V isolated from floating, and the secondary circuit ground is GND. Using an H-bridge circuit, the H-bridge power supply is connected to the positive isolation voltage VDD and the secondary circuit ground GND, and the two output ends of the H-bridge, one end output is connected to the PE signal, and the other end output is connected to the CP signal. When the H-bridge is forward-conducted, the positive isolation voltage VDD is in a low-impedance state to the CP signal, the secondary circuit ground GND is in a low-impedance state to the PE signal, and the CP signal is +12V; when the H-bridge is reverse-conducted, the positive isolation voltage VDD is in a low-impedance state to the PE signal, the secondary circuit ground GND signal is in a low-impedance state to the CP signal, and the CP signal is -12V; when the H-bridge output is disabled, the PE signal and the CP signal are both in a high-impedance state, that is, the CP signal is 0V.

[0061] For further information, see Figure 3, the charging protocol controller includes a controller module and a resistor R, wherein the first inlet IN+ and the second inlet IN- of the controller module are both connected to the main controller, the first outlet OUT+ of the controller module is connected to the output port through the resistor R, the second outlet OUT- of the controller module is connected to the output port, and the controller module is also connected to the positive isolation voltage VDD and the secondary circuit ground GND. Among them, the first outlet OUT+ outputs the CP signal through the resistor R, and the second outlet OUT- outputs the PE signal, for example, the size of the resistor R is 1k / 1W, for example, the positive isolation voltage VDD is 12V. For example, the controller module can be L9110 or L298n. In this embodiment, the method of generating CP using an H-bridge, wherein the H-bridge circuit can also be composed of a triode, a MOS tube, and can also be implemented using an existing H-bridge circuit and module.

[0062] This embodiment uses an H-bridge to output a CP signal, which simplifies the circuit, thereby reducing overall costs and reducing failure points.

[0063] In one embodiment, the circuit further includes an isolated positive voltage AC / DC connected to the first live line L1 and the first neutral line N1 for providing a positive isolated voltage VDD relative to the secondary circuit ground GND. For example, the isolated positive voltage AC / DC provides an isolated voltage of +12V.

[0064] The entire circuit uses an isolated positive voltage AC / DC circuit to generate a floating power supply isolated from the ground. The floating power supply is a positive isolated voltage VDD, such as a +12V power supply.

[0065] In one embodiment, the circuit further includes a first switch K1, a second switch K2, a third switch K3, a residual current protector and a voltage and current detection module, wherein:

[0066] The first end of the first switch K1 is connected to the input port through the first live line L1, the second end of the first switch K1 is connected to the output port through the first live line L1, the first end of the second switch K2 is connected to the input port through the first auxiliary live line L1', the second end of the second switch K2 is connected between the second end of the first switch K1 and the output port through the first auxiliary live line L1', the first end of the third switch K3 is connected to the input port through the first neutral line N1, the second end of the third switch K3 is connected to the output port through the first neutral line N1, and the second end of the first auxiliary neutral line N1' is connected between the first neutral line N1 and the first end of the third switch K3;

[0067] The residual current protector is connected to the main controller and is used to monitor the current difference between the first live wire L1, the first auxiliary live wire L1' and the first neutral wire N1;

[0068] The residual current protector can be a leakage protector, which uses a mutual inductor to monitor the current difference between the first live wire L1, the first auxiliary live wire L1` and the first neutral wire N1. When leakage occurs, the first switch K1, the second switch K2 and the third switch K3 can be actively cut off, or the first switch K1, the second switch K2 and the third switch K3 can be cut off through the main controller. The residual current protector will report the leakage situation to the main controller so that the main controller can control the working conditions of other parts, thereby ensuring the working safety of the charger.

[0069] The voltage and current detection module is connected between the first live wire L1 and the first end of the first switch K1, the first ground wire EARTH1, and is also connected to the main controller, and is used to detect whether the voltage exceeds the second preset threshold and whether the current exceeds the third preset threshold.

[0070] The voltage and current detection module is used to measure the AC voltage and current, to prevent the danger caused by excessively high or low voltage, to prevent the danger caused by excessive current, and to measure electric energy.

[0071] Among them, the numerical values ​​of the second preset threshold and the third preset threshold can be set by those skilled in the art according to actual needs, and are not specifically limited here.

[0072] An embodiment of the present invention further provides a charger, comprising the circuit for a charger as described in any one of the above embodiments, the charger further comprising a power line, the power line comprising a second live line L2, a second neutral line N2, a second ground line EARTH2, and a cable input head, wherein:

[0073] The second live wire L2 is connected between the first live wire L1 and the cable input connector, the second neutral wire N2 is connected between the first neutral wire N1 and the cable input connector, and the second ground wire EARTH2 is connected between the first ground wire EARTH1 and the cable input connector.

[0074] The power line is used to connect the device body provided with the circuit of this embodiment to a power source, and to provide a power capacity identification signal and temperature monitoring for the device body.

[0075] The cable input head can be a standard plug or an open cable head, which can be matched with various power sockets and terminal blocks.

[0076] In one embodiment, the power line further includes a second auxiliary live line L2', a second auxiliary neutral line N2' and a second auxiliary ground line EARTH2', wherein:

[0077] The second auxiliary live wire L2' is connected between the second live wire L2 and the cable input head, the second auxiliary neutral wire N2' is connected between the second neutral wire N2 and the cable input head, and the second auxiliary earth wire EARTH2' is connected between the second earth wire EARTH2 and the cable input head.

[0078] In one embodiment, the power cable further includes an identification signal line IR, and the identification signal line IR is connected between the identification signal module and the cable input head.

[0079] The cable used to connect the cable input head in this embodiment can use a 3-core cable or a 4-core cable, wherein the 3-core cable includes a second live wire L2, a second neutral wire N2, and a second ground wire EARTH2, and the 4-core cable includes a second live wire L2, a second neutral wire N2, a second ground wire EARTH2 and an identification signal wire IR.

[0080] The power cord of this embodiment also includes a cable output head. The cable of the cable output head can use a 6-core cable or a 7-core cable. The 6-core cable includes a second live wire L2, a second auxiliary live wire L2`, a second neutral wire N2, a second auxiliary neutral wire N2`, a second ground wire EARTH2 and a second auxiliary ground wire EARTH2`. The 7-core cable includes a second live wire L2, a second auxiliary live wire L2`, a second neutral wire N2, a second auxiliary neutral wire N2`, a second ground wire EARTH2 and a second auxiliary ground wire EARTH2` and an identification signal line IR. For example, the cable output head is a 7-core waterproof aviation plug for connecting to the device body.

[0081] For example, if the power supply is a socket with a power supply capacity of 16A, connect a 3-core cable: that is, connect the second live wire L2, the second neutral wire N2, and the second ground wire EARTH2; if the power supply is a socket with a power supply capacity of 16-25A, connect a 4-core cable: connect 4 wires: that is, connect the second live wire L2, the second neutral wire N2, the second ground wire EARTH2 and the identification signal line IR; if the power supply is a socket with a power supply capacity of 25-31A, connect a 6-core cable: that is, connect the second live wire L2, the second auxiliary live wire L2`, the second neutral wire N2, the second auxiliary neutral wire N2`, the second ground wire EARTH2 and the second auxiliary ground wire EARTH2`; if the power supply is a socket with a power supply capacity of 32A or above, connect a 7-core cable: that is, connect the second live wire L2, the second auxiliary live wire L2`, the second neutral wire N2, the second auxiliary neutral wire N2`, the second ground wire EARTH2 and the second auxiliary ground wire EARTH2` and the identification signal line IR.

[0082] This embodiment can switch the power connector cables of different power lines so that the device body equipped with the circuit of this embodiment can identify the cable identification, thereby obtaining the power output capacity and then adjusting the charging power of the electric vehicle. Users can charge the vehicle on different power sources without worrying about charging failures or safety accidents caused by power mismatch.

[0083] This embodiment can adapt to different power supply modes and identification modes by replacing different power cords.

[0084] See also Figure 4 The device body of this embodiment refers to a device that can convert AC power into GBT18487.1 AC charging signals accepted by electric vehicles, adjust the charging power signal according to the identification of the power output capacity, and connect the electric vehicle at the same time. The device body includes a main control box, a charging gun cable and a charging gun, wherein the circuit of this embodiment is arranged in the main control box, so as to realize the charging protocol docking with the vehicle, power identification, safety protection function, and human-computer interaction function, and the main control box includes the following components: power access aviation plug, circuit, output cable waterproof Gland connector, and temporary grounding hole; the main control box is composed of a waterproof junction box as the main body, and the outer shell includes a power access aviation plug 1, HMI (human-machine interaction interface), an output cable Gland head 4 and a temporary grounding hole, for example, the power access aviation plug 1 is a 7-core flange aviation plug, wherein the HMI includes a 2-digit digital tube 2 and a waterproof button 3, and the user can use the waterproof button 3 to stop charging or set the charging current in an emergency, and obtain the charging current information or fault code through the 2-digit digital tube.

[0085] The main control box of this embodiment is provided with a temporary grounding hole, which is used for charging in situations where the power supply cannot provide a ground wire, providing a charging solution for situations where there is no ground wire, while avoiding the safety hazards caused by the use of equipment such as ground-free sockets. The ground wire of this embodiment can be connected by means of nearby grounding, such as a grounding busbar, a metal facility buried underground or in a wall, a temporary grounding pin inserted into wet soil, etc. The main control box provides a temporary grounding hole into which a terminal can be inserted, for example, a connecting wire with a banana plug at one end and an alligator clip at the other end. Connect the banana plug to the main control box, and clamp the alligator clip at the other end of the connecting wire to a buried grounding busbar, a metal facility underground or in a wall, a temporary grounding pin inserted into wet soil, etc., to complete the grounding and meet the grounding requirements for safe charging.

[0086] In addition to using a banana plug for connection, the temporary grounding hole of this embodiment can also use other types of plugs, such as an aviation plug, a terminal block, etc., and can provide a connector for connecting to a ground cable outside the housing panel.

[0087] Since sockets with different power supply capabilities often have different external dimensions, and an electric vehicle charger with a single power plug can only be plugged into a fixed type of socket, this embodiment can obtain the corresponding power output capacity by using power cords with different types of plugs, charge according to the power output capacity, or charge at a power within the power output capacity specified by the user.

[0088] For charging in situations without a ground wire, existing chargers need to bypass the vehicle control and guidance function protection method, which makes charging potential safety hazards. For example, when the power supply has a live neutral line or a live neutral reverse connection fault, the entire vehicle shell will be charged, which poses a risk of electric shock. For charging in situations without a ground wire, the charger of this embodiment uses a ground wire that is a conductor connected to the earth. It is directly connected to the earth through the main control box of the charging device, which can achieve local grounding and thus achieve safe charging.

[0089] This embodiment uses an isolated positive voltage AC / DC to power the circuit, and the entire charging device is in a suspended state relative to the PE signal. For example, the isolated positive voltage AC / DC powers the circuit with a size of +12V. In this state, there is a +12V isolated power supply, and an H-bridge can be used to generate a ±12V square wave CP signal.

[0090] See also Figure 2 The embodiment of the present invention further provides a method for charging using a charger based on the above embodiment, the method comprising:

[0091] Detect whether the voltage difference between the first auxiliary live wire L1' and the first ground wire EARTH1 is greater than a first preset threshold:

[0092] If the voltage difference between the first auxiliary live wire L1` and the first ground wire EARTH1 is greater than a first preset threshold, it can be determined that the output current capacity is above a certain set value, for example, the set value is 25A. At this time, continue to detect whether the IR signal exists. If it exists, charge according to the output current of the first power supply. If not, charge according to the output current of the second power supply.

[0093] If the voltage difference between the first auxiliary live wire L1` and the first ground wire EARTH1 is not greater than the first preset threshold, it can be determined that the output current capacity is below a certain set value. At this time, continue to detect whether the IR signal exists. If it exists, charge according to the output current of the third power supply. If it does not exist, charge according to the output current of the fourth power supply.

[0094] The currents output by the third power supply output current, the fourth power supply output current, the first power supply output current and the second power supply output current increase in sequence.

[0095] The IR signal can be detected by measuring the voltage drop on the first ground line EARTH1 when the IR current passes through. If the voltage drop is equal to the power supply voltage, it means there is no IR signal. If the voltage drop is less than the power supply voltage, it means there is IR.

[0096] For example, the current output capacity of the first power supply output current is 16-25A, the current output capacity of the second power supply output current is less than 16A, the current output capacity of the third power supply output current is more than 32A, and the current output capacity of the fourth power supply output current is 25-32A.

[0097] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0098] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0099] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0100] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A circuit for a charger, characterized in that: include: A first live wire (L1), a first auxiliary live wire (L1`), a first neutral wire (N1), a first auxiliary neutral wire (N1`), a first ground wire (EARTH1), a first auxiliary ground wire (EARTH1`), an identification signal module, an auxiliary live wire signal detection module, a main controller, a charging protocol controller, an input port and an output port, wherein: The first ends of the first live wire (L1), the first auxiliary live wire (L1`), the first neutral wire (N1), the first auxiliary neutral wire (N1`), the first ground wire (EARTH1) and the first auxiliary ground wire (EARTH1`) are connected to the input port, the second ends of the first live wire (L1), the first neutral wire (N1) and the first ground wire (EARTH1`) are connected to the input port, the second end of the first auxiliary live wire (L1`) is connected between the first live wire (L1) and the output port, the second end of the first auxiliary neutral wire (N1`) is connected between the first neutral wire (N1) and the output port, and the second end of the first auxiliary ground wire (EARTH1`) is connected between the first ground wire (EARTH1) and the output port; The identification signal module is connected between the input port and the main controller, and is used to detect whether the IR signal exists and output a first detection result; The auxiliary live wire signal detection module is connected to the first auxiliary live wire (L1`), the first ground wire (EARTH1) and the first auxiliary ground wire (EARTH1`), and is used to detect whether the voltage difference between the first auxiliary live wire (L1`) and the first ground wire (EARTH1) is greater than a first preset threshold value, and generate a second detection result; The main controller is connected to the auxiliary live wire signal detection module and the charging protocol controller, and is used to receive the first detection result and the second detection result, and output the first detection result and the second detection result to the charging protocol controller; The charging protocol controller is connected to the output port, and is used to determine the output current capability according to the first detection result and the second detection result, and generate a CP signal.

2. The circuit according to claim 1, characterized in that The charging protocol controller is specifically configured to generate the CP signal according to the first detection result and the second detection result by using an H-bridge.

3. The circuit according to claim 2, characterized in that It also includes an isolated positive voltage AC / DC connected to the first live line (L1) and the first neutral line (N1) for providing a positive isolated voltage (VDD) relative to the secondary circuit ground (GND).

4. The circuit according to claim 3, characterized in that The charging protocol controller includes a controller module and a resistor (R), wherein: The first inlet (IN+) and the second inlet (IN-) of the controller module are both connected to the main controller, the first outlet (OUT+) of the controller module is connected to the output port through the resistor (R), the second outlet (OUT-) of the controller module is connected to the output port, and the controller module is also connected to the positive isolation voltage (VDD) and the secondary circuit ground (GND).

5. The circuit according to claim 1, characterized in that It also includes a first switch (K1), a second switch (K2), a third switch (K3), a residual current protector and a voltage and current detection module, wherein: The first end of the first switch (K1) is connected to the input port through the first live line (L1), the second end of the first switch (K1) is connected to the output port through the first live line (L1), the first end of the second switch (K2) is connected to the input port through the first auxiliary live line (L1'), the second end of the second switch (K2) is connected between the second end of the first switch (K1) and the output port through the first auxiliary live line (L1'), the first end of the third switch (K3) is connected to the input port through the first neutral line (N1), the second end of the third switch (K3) is connected to the output port through the first neutral line (N1), and the second end of the first auxiliary neutral line (N1') is connected between the first neutral line (N1) and the first end of the third switch (K3); The residual current protector is connected to the main controller and is used to monitor the current difference between the first live wire (L1), the first auxiliary live wire (L1') and the first neutral wire (N1); The voltage and current detection module is connected between the first live wire (L1) and the first end of the first switch (K1), the first ground wire (EARTH1), and is also connected to the main controller, and is used to detect whether the voltage exceeds a second preset threshold and whether the current exceeds a third preset threshold.

6. A charger, characterized in that: The circuit according to any one of claims 1 to 5 further comprises a power line, wherein the power line comprises a second live line (L2), a second neutral line (N2), a second ground line (EARTH2), and a cable input head, wherein: The second live wire (L2) is connected between the first live wire (L1) and the cable input head, the second neutral wire (N2) is connected between the first neutral wire (N1) and the cable input head, and the second ground wire (EARTH2) is connected between the first ground wire (EARTH1) and the cable input head.

7. The charger according to claim 6, characterized in that: The power line also includes a second auxiliary live line (L2'), a second auxiliary neutral line (N2') and a second auxiliary ground line (EARTH2'), wherein: The second auxiliary live wire (L2`) is connected between the second live wire (L2) and the cable input head, the second auxiliary neutral wire (N2`) is connected between the second neutral wire (N2) and the cable input head, and the second auxiliary ground wire (EARTH2`) is connected between the second ground wire (EARTH2) and the cable input head.

8. The charger according to claim 6 or 7, characterized in that: The power cable further comprises an identification signal line (IR), and the identification signal line (IR) is connected between the identification signal module and the cable input head.

9. The charger according to claim 6, characterized in that: It also includes a main control box, in which the circuit for the charger is arranged, and a temporary grounding hole is arranged on the main control box.

10. A method for charging using a charger, characterized in that: The charger is the charger according to any one of claims 6 to 9, and the method comprises: Detecting whether a voltage difference between a first auxiliary live wire (L1') and a first ground wire (EARTH1) is greater than a first preset threshold; If the voltage difference between the first auxiliary live wire (L1`) and the first ground wire (EARTH1) is greater than a first preset threshold, continue to detect whether the IR signal exists, if so, charge according to the output current of the first power supply, if not, charge according to the output current of the second power supply; If the voltage difference between the first auxiliary live wire (L1`) and the first ground wire (EARTH1) is not greater than a first preset threshold, continue to detect whether the IR signal exists, if so, charge according to the output current of the third power supply, if not, charge according to the output current of the fourth power supply; The currents output by the third power supply output current, the fourth power supply output current, the first power supply output current and the second power supply output current increase in sequence.

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