Charging guidance signal collection circuit, on-board charging inlet and charging stand for new energy vehicles

Abstract

The present invention relates to a charging guidance signal collection technical field of new energy vehicles, and provides a charging guidance signal collection circuit, an on-board charging inlet for new energy vehicles, and a charging stand, the charging guidance signal collection circuit including a signal amplifying and filtering circuit for receiving a charging guidance signal and amplifying and filtering the received charging guidance signal, and a voltage dividing circuit having an input terminal connected to an output terminal of the signal amplifying and filtering circuit for adjusting the charging guidance signal processed by the signal amplifying and filtering circuit to a target value, which is a voltage value that meets the electrical requirements of the charging guidance signal input pin of the on-board charging controller, the voltage dividing circuit including at least two series-connected variable resistors, and the resistance value of the variable resistor is variable according to the electrical requirements of the charging guidance signal input pin. The embodiments of the present invention can solve or mitigate the problem that the standard mismatch of the charging guidance signal makes it difficult to normally charge a new energy vehicle.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application filed on September 28, 2021, bearing application number 202111144495.1 and entitled "Charging guidance signal collection circuit, on-board charging inlet and charging station for new energy vehicles," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of collecting charging guidance signals for new energy vehicles, and in particular to a charging guidance signal collecting circuit, an on-board charging inlet for new energy vehicles, and a charging stand. [Background technology]

[0003] The charging guidance signal for new energy vehicles can realize communication functions such as connection confirmation, charging current confirmation, and charging start / stop between the onboard charging inlet for new energy vehicles and the charging station. Currently, there is no international standard for the charging guidance signal for new energy vehicles, and the standards for the charging guidance signals for new energy vehicles in each country / region are not consistent. As a result, a new energy vehicle that can be charged normally in one country / region may not be able to be charged normally in another country / region. Therefore, how to improve the charging adaptability of new energy vehicles is currently a technical issue that needs to be resolved urgently. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the embodiments of the present invention is to provide a charging guidance signal collecting circuit, an on-board charging inlet for a new energy vehicle, and a charging stand, so as to improve the charging adaptability of the new energy vehicle. [Means for solving the problem]

[0005] To achieve the above object, in one aspect, an embodiment of the present invention includes a signal amplifying and filtering circuit for receiving a charging guidance signal and amplifying and filtering the received charging guidance signal; a voltage divider circuit having an input terminal connected to an output terminal of the signal amplifying and filtering circuit, for adjusting the charge guidance signal processed by the signal amplifying and filtering circuit to a target value that is a voltage value that satisfies an electrical requirement of a charge guidance signal input pin of an on-board charging controller; The voltage divider circuit includes at least two series-connected variable resistors, and the resistance value of the variable resistors is variable according to the electrical requirements of the charging guidance signal input pin, thereby providing a charging guidance signal collection circuit.

[0006] In an embodiment of the present invention, the voltage divider circuit includes a first variable resistor and a second variable resistor connected in series, one end of the first variable resistor is connected to the output end of the signal amplifying filter circuit, the other end of the first variable resistor is connected to one end of the second variable resistor, and the other end of the second variable resistor is connected to a wire ground terminal, and a third connection point between the first variable resistor and the second variable resistor forms the output end of the charging guidance signal collecting circuit.

[0007] In an embodiment of the present invention, the impedance ratio of the first variable resistor to the second variable resistor is equal to or greater than 52.3.

[0008] In an embodiment of the present invention, the amplification factor of the signal amplifying filter circuit is at least 20 times, and the filter cutoff frequency of the signal amplifying filter circuit is 10 to 50 Hz.

[0009] In an embodiment of the present invention, the charging guidance signal collecting circuit further includes a pre-stage voltage dividing circuit, the output terminal of which is connected to the input terminal of the signal amplifying and filtering circuit, for receiving the charging guidance signal and reducing the charging guidance signal in a voltage dividing manner to provide an amplifying space for the signal amplifying and filtering circuit.

[0010] In an embodiment of the present invention, the step-down factor of the pre-stage voltage divider circuit is at least 20 times.

[0011] In an embodiment of the present invention, the charging guidance signal collecting circuit further includes a filter circuit, the output terminal of which is connected to the input terminal of the pre-stage voltage divider circuit, the input terminal of which is the input terminal of the charging guidance signal collecting circuit, for filtering out electromagnetic interference in the original charging guidance signal to obtain the charging guidance signal.

[0012] In an embodiment of the present invention, the filter circuit includes a first capacitor, a second capacitor, a first ferrite bead, and an inductor, where the first capacitor, the second capacitor, and the first ferrite bead form a π filter to filter out high-frequency electromagnetic interference in the original charging guidance signal, and the inductor is connected to the π filter to filter out electromagnetic interference other than that at a cutoff frequency of the π filter.

[0013] In an embodiment of the present invention, the input end of the first ferrite bead is the input end of the charging guidance signal collecting circuit, the output end of the first ferrite bead is connected to the input end of the inductor, the output end of the inductor is connected to the input end of the pre-stage voltage divider circuit, one end of the first capacitor is connected to the input end of the first ferrite bead, the other end of the first capacitor is connected to the protective ground terminal, one end of the second capacitor is connected to the output end of the first ferrite bead, and the other end of the second capacitor is connected to the protective ground terminal.

[0014] In an embodiment of the present invention, the pre-stage voltage divider circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the output end of the filter circuit, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to a wire ground terminal, and a first connection point between the first resistor and the second resistor forms the output end of the pre-stage voltage divider circuit.

[0015] In an embodiment of the present invention, the signal amplifying filter circuit includes an operational amplifier, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor, wherein the inverting input terminal of the operational amplifier is connected to the output terminal of the pre-stage voltage dividing circuit, the output terminal of the operational amplifier is connected to the input terminal of the voltage dividing circuit, one end of the third resistor is connected to the output terminal of the operational amplifier, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to a wire ground terminal, the inverting input terminal of the operational amplifier is connected to a second connection point which is a connection point between the third resistor and the fourth resistor, and the positive power supply of the operational amplifier is connected to the first connection point. a pin connected to a DC power supply, the negative power supply pin of the operational amplifier connected to a ground terminal; the third resistor and the fourth resistor form an amplification factor adjustment circuit of the operational amplifier; one end of the third capacitor is connected to the in-phase input terminal of the operational amplifier, and the other end of the third capacitor is connected to the ground terminal; the third capacitor filters out electromagnetic interference at the in-phase input terminal of the operational amplifier; one end of the fourth capacitor is connected to the output terminal of the operational amplifier, and the other end of the fourth capacitor is connected to the second connection point; and the fourth capacitor filters out electromagnetic interference at the output terminal of the operational amplifier.

[0016] In an embodiment of the present invention, the charging guidance signal collection circuit has one end connected to the wire ground terminal of the charging guidance signal collection circuit and the other end connected to the protective ground terminal, and further includes a second ferrite bead for realizing high-frequency isolation between the wire ground terminal and the protective ground terminal.

[0017] In another aspect, an embodiment of the present invention provides a charging device including: a charging guidance signal receiving terminal; the charging guidance signal collecting circuit, whose input terminal is connected to the output terminal of the charging guidance signal receiving terminal; The present invention further provides an on-board charging inlet for a new energy vehicle, including:

[0018] In another aspect, an embodiment of the present invention provides a charging device including: a charging guidance signal output terminal; the charging guidance signal collecting circuit, the output terminal of which is connected to the input terminal of the charging guidance signal output terminal; The present invention further provides a charging station including:

[0019] As can be seen from the above technical solutions according to the embodiments of the present invention, in the embodiments of the present invention, the voltage divider circuit can accurately adjust the charging guidance signal to a voltage value that meets the electrical requirements of the charging guidance signal input pin of the on-board charging controller, and allows new energy vehicles to adapt to the charging guidance signal standards of new energy vehicles in different countries / regions, thereby eliminating or alleviating the problem of difficulties in normal charging of new energy vehicles caused by inconsistent charging guidance signal standards, and further improving the charging adaptability of new energy vehicles.

[0020] In the following, in order to more clearly explain the technical solutions in the embodiments of the present invention or the prior art, drawings necessary for describing the embodiments or the prior art will be briefly introduced. The drawings in the following description are only some of the embodiments described in the present invention, and it is obvious to those skilled in the art that other drawings can also be obtained based on these drawings without any creative efforts. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 2 is a structural block diagram showing a charging guidance signal collection circuit in some embodiments of the present invention. [Figure 2] 1 is a circuit diagram showing a charging guidance signal collecting circuit according to some embodiments of the present invention; [Figure 3] FIG. 10 is a structural block diagram showing a charging guidance signal collecting circuit in some other embodiments of the present invention. [Figure 4] 10 is a circuit diagram showing a charging guidance signal collecting circuit according to another embodiment of the present invention; FIG. [Figure 5] FIG. 10 is a structural block diagram showing a charging guidance signal collecting circuit in some other embodiments of the present invention. [Figure 6] 10 is a circuit diagram showing a charging guidance signal collecting circuit according to another embodiment of the present invention; FIG. [Figure 7] 4 is a schematic diagram illustrating the connection between the wire ground terminal and the protective ground terminal of the charging guidance signal collecting circuit in some embodiments of the present invention. FIG. [Figure 8] 1 is a structural block diagram of an on-board charging inlet for a new energy vehicle according to some embodiments of the present invention; [Figure 9] FIG. 1 is a structural block diagram illustrating a charging station in some embodiments of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, in order to allow those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described with reference to the drawings in the embodiments of the present invention. It is clear that the described embodiments are only some embodiments of the present invention and do not represent all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative effort should fall within the scope of protection of the present invention. For example, in the following description, "a second member is formed above a first member" may include an embodiment in which the first member and the second member are formed to be in direct contact with each other, or an embodiment in which the first member and the second member are formed to be in indirect contact with each other (i.e., an additional member may be further included between the first member and the second member).

[0023] For convenience of description, some descriptions may use spatially relative terms such as "above," "below," "top," "below," etc. to describe the relationship of one element or component to another element or component (or several other elements or components) as shown in each drawing of the embodiment. It should be understood that the spatially relative terms are intended to encompass different orientations for use or operation of the device other than the orientation depicted in the drawing. For example, if the device in the drawing were inverted, an element or component described as "below" or "below" another element or component would then be positioned "above" or "on" the other element or component.

[0024] In view of the problem that the conventional new energy vehicle may have difficulty in normal charging due to inconsistencies in the charging guidance signal standards of new energy vehicles in different countries / regions, an embodiment of the present invention provides a charging guidance signal collection circuit that enables new energy vehicles to adapt to the charging guidance signal standards of new energy vehicles in different countries / regions, thereby eliminating or alleviating the problem that the new energy vehicle has difficulty in normal charging due to inconsistencies in the charging guidance signal standards, thereby improving the charging adaptability of new energy vehicles. Note that the charging guidance signal collection circuit of the embodiment of the present invention may be applied to an on-board charging inlet for new energy vehicles or to a charging station, which can be selected as needed during implementation.

[0025] The term "new energy vehicle" in the embodiments of the present invention refers to a new energy vehicle that is electrically powered and whose power battery can be charged, such as a battery electric vehicle (BEV) or a plug-in hybrid electric vehicle (HEV). It should be understood by those skilled in the art that the term "charging station" in the embodiments of the present invention refers to a charging station for charging new energy vehicles, and the term "charging guidance signal" in the embodiments of the present invention generally refers to a DC charging guidance signal.

[0026] As shown in FIG. 1, in some embodiments, the charging guidance signal collecting circuit may include a signal amplifying and filtering circuit 30 and a voltage dividing circuit 40.

[0027] The signal amplifying and filtering circuit 30 may receive the charging guidance signal and amplify and filter the received charging guidance signal. Amplification increases the voltage value of the charging guidance signal to exceed the voltage value currently corresponding to the specifications of all (or most) of the charging guidance signal, thereby facilitating voltage division adjustment in the subsequent voltage dividing circuit. In some embodiments, the amplification factor of the signal amplifying and filtering circuit 30 is at least 20 times to provide a sufficient input voltage for voltage division in the subsequent voltage dividing circuit 40. The filtering by the signal amplifying and filtering circuit 30 can improve the electromagnetic interference prevention performance of the charging guidance signal collecting circuit. In some embodiments, the filter cutoff frequency of the signal amplifying and filtering circuit 30 is 10 to 50 Hz.

[0028] The input terminal of the voltage divider circuit 40 is connected to the output terminal of the signal amplifying and filtering circuit 30. The voltage divider circuit 40 may adjust the charge guidance signal output after processing by the signal amplifying and filtering circuit 30 to a target voltage value that meets the electrical requirements of the charge guidance signal input pin of the onboard charge controller. The voltage divider circuit may include at least two series-connected variable resistors (i.e., voltage-dividing resistors with variable resistance), and the resistance of the variable resistor may be variable according to the electrical requirements of the charge guidance signal input pin. The charge guidance signal input pin of different onboard charge controllers has different maximum allowable input voltages, for example, 3.3 V and 5 V. Therefore, in an embodiment of the present invention, the voltage divider circuit 40 is designed to have a variable output voltage. Specifically, for a given target voltage, if the voltage value of the charge guidance signal is higher than the target voltage, the output voltage of the voltage divider circuit 40 may be reduced until it becomes equal to the target voltage. In this way, new energy vehicles can adapt to the standards of new energy vehicle charging guidance signals in different countries / regions, thereby eliminating or mitigating the problem of difficulties in normal charging of new energy vehicles due to inconsistencies in charging guidance signal standards, and further improving the charging adaptability of new energy vehicles.

[0029] As shown in FIG. 2, in some embodiments, the signal amplifying and filtering circuit 30 may include an operational amplifier UA1, a third resistor R3, a fourth resistor R4, a third capacitor C3, and a fourth capacitor C4. The operational amplifier UA1 has a forward input terminal that receives the charging guidance signal, an output terminal that is connected to the input terminal of the voltage divider circuit 40, one terminal of a third resistor R3 that is connected to the output terminal of the operational amplifier UA1, the other terminal of the third resistor R3 that is connected to one terminal of a fourth resistor R4 that is connected to the power line ground terminal, a reverse input terminal that is connected to the second junction between the third resistor R3 and the fourth resistor R4, a positive power supply pin of the operational amplifier UA1 that is connected to a DC power supply (e.g., +12V in FIG. 2), and a negative power supply pin of the operational amplifier UA1 that is connected to the power line ground terminal, and the third resistor R3 and the fourth resistor R4 form an amplification factor adjustment circuit for the operational amplifier UA1 so that the output terminal of the operational amplifier UA1 can output a charging guidance signal that satisfies a set amplification factor. Here, the amplification factor of the amplification factor adjustment circuit is

number

[0030] Because the operational amplifier UA1 has a high input impedance and a large common-mode suppression ratio, the charging guidance signal output after being processed by the signal amplifying and filtering circuit 30 is more stable than the received charging guidance signal. In addition, because the operational amplifier UA1 has a small output impedance, the subsequent voltage dividing circuit 40 can have a stronger load driving capability.

[0031] 2, one end of the third capacitor C3 is connected to the parallel input terminal of the operational amplifier UA1, and the other end of the third capacitor C3 is connected to the ground terminal. This capacitor C3 filters out electromagnetic interference at the parallel input terminal of the operational amplifier UA1, thereby improving the electromagnetic interference protection performance of the parallel input terminal of the operational amplifier UA1. One end of the fourth capacitor C4 is connected to the output terminal of the operational amplifier UA1, and the other end of the fourth capacitor C4 is connected to the second connection point. This capacitor C4 filters out electromagnetic interference at the output terminal of the operational amplifier UA1, thereby improving the electromagnetic interference protection performance of the output terminal of the operational amplifier UA1.

[0032] 2, in some embodiments, the voltage dividing circuit 40 may include a first variable resistor R5 and a second variable resistor R6. One end of the first variable resistor R5 is connected to the output end of the signal amplifying and filtering circuit UA1, the other end of the first variable resistor R5 is connected to one end of the second variable resistor R6, the other end of the second variable resistor R6 is connected to the power line ground terminal, and the third connection point between the first variable resistor R5 and the second variable resistor R6 forms the output end of the charging guidance signal collecting circuit.

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[0033] In this way, a simple double resistor voltage divider circuit can be used to achieve compatibility between the electrical requirements of the charging guidance signal and the charging guidance signal input pin of the on-board charging controller, and is also advantageous in reducing implementation costs and improving reliability. Here, the resistance relationship between the first resistor R1 and the second resistor R2 is determined by the voltage divider ratio (i.e.,

number

[0034] For example, in one embodiment, the allowable input voltage of the charging guidance signal input pin of some onboard charging controllers is 5V, but the charging guidance signal output from the charging station is often 12V. To ensure normal operation of the onboard charging controller, the adjusted output voltage of the voltage divider circuit 40 should not be higher than 5V. In this case, the impedance ratio between the first variable resistor R5 and the second variable resistor R6 should be 52.3 or greater. To achieve the impedance ratio between the first variable resistor R5 and the second variable resistor R6 of 52.3 or greater, the ratio between the minimum resistance value of the first variable resistor R5 and the maximum resistance value of the second variable resistor R6 should be 52.3 or greater. If the allowable input voltage of the charging guidance signal input pin of some other on-board charging controllers is lower than 5V (e.g., 3.3V), the impedance ratio between the first variable resistor R5 and the second variable resistor R6 should be larger, which can be achieved by increasing the resistance value of the first variable resistor R5 and / or decreasing the resistance value of the second variable resistor R6, so that the voltage range that can be output by the voltage divider circuit 40 can meet the standards for charging guidance signals for new energy vehicles in different countries / regions.

[0035] In some embodiments, the voltage division ratio of the voltage divider circuit 40 can be adjusted by manually adjusting the resistance value linearly or stepwise using an adjustment knob, i.e., the resistance value of the first variable resistor R5 and / or the second variable resistor R6 can be changed using an adjustment knob, and such adjustment is low cost. In other embodiments, the first variable resistor R5 and the second variable resistor R6 of the voltage divider circuit 40 may be configured with a structure that allows easy installation and removal, so that when the voltage division ratio of the voltage divider circuit 40 needs to be adjusted, the first variable resistor R5 and / or the second variable resistor R6 can be replaced.

[0036] As shown in FIG. 3 , in some other embodiments, the charging guidance signal collecting circuit may further include a pre-stage voltage divider circuit 20. The input terminal of the pre-stage voltage divider circuit 20 may receive the charging guidance signal, and the output terminal of the pre-stage voltage divider circuit 20 may be connected to the input terminal of the signal amplifying and filtering circuit 30. The pre-stage voltage divider circuit 20 may receive the charging guidance signal and step down the charging guidance signal using a voltage division method to provide an amplification space for the signal amplifying and filtering circuit. In some embodiments, the step-down factor of the pre-stage voltage divider circuit 20 is at least 20 times. Such step-down by the pre-stage voltage divider circuit 20 may also be beneficial for the charging guidance signal to meet the input voltage requirements of the input terminal of the signal amplifying and filtering circuit 30 (i.e., for the voltage value of the charging guidance signal to be within the allowable input voltage range of the input terminal of the signal amplifying and filtering circuit 30).

[0037] 4, in some embodiments, the pre-stage voltage divider circuit 20 may include a first resistor R1 and a second resistor R2. One end of the first resistor R1 is the input end of the charging guidance signal collecting circuit, and the first resistor R1 receives the charging guidance signal. The other end of the first resistor R1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the power line ground terminal. The first connection point between the first resistor R1 and the second resistor R2 may form the output end of the pre-stage voltage divider circuit 20. The voltage division principle, namely,

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[0038] 5, in some other embodiments, the charging guidance signal collection circuit may further include a filter circuit 10 in addition to the pre-stage voltage divider circuit 20, the signal amplifying and filtering circuit 30, and the voltage divider circuit 40. The input end of the filter circuit 10 is the input end of the charging guidance signal collection circuit and receives the original charging guidance signal, and the output end of the filter circuit 10 is connected to the input end of the pre-stage voltage divider circuit 20. The filter circuit 10 filters out electromagnetic interference in the original charging guidance signal, and through precise filtering, can further improve the electromagnetic interference prevention capability of the charging guidance signal collection circuit.

[0039] In the embodiment of the present invention, the original charging guidance signal refers to the charging guidance signal that has not been processed by the charging guidance signal collection circuit of the embodiment of the present invention. According to different application scenarios, the source of the original charging guidance signal is also different.

[0040] For example, in some embodiments, when the charging guidance signal collection circuit is applied to a scenario of an on-board charging inlet for a new energy vehicle, the original charging guidance signal may be provided from the charging guidance signal receiving terminal of the on-board charging inlet for a new energy vehicle, that is, the charging guidance signal receiving terminal may receive the charging guidance signal transmitted from the charging station and provide the charging guidance signal to the charging guidance signal collection circuit.

[0041] In some other embodiments, when the charging guidance signal collection circuit is applied to a charging station scenario, the original charging guidance signal may be provided from the charging guidance signal output terminal of the charging station, that is, a charging guidance signal collection circuit is added between the charging guidance signal output terminal and the charging guidance signal generation circuit, so that the charging guidance signal generated by the charging guidance signal generation circuit can be adjusted to an appropriate value by the charging guidance signal collection circuit, and the adjusted charging guidance signal can be provided to the on-board charging inlet for new energy vehicles via the charging guidance signal output terminal.

[0042] As shown in FIG. 6, in some embodiments, the filter circuit 10 may include a first capacitor C1, a second capacitor C2, a first ferrite bead FB1, and an inductor FB2, where the first capacitor C1, the second capacitor C2, and the first ferrite bead FB1 form a π filter to filter out high-frequency electromagnetic interference in the original charging guidance signal, and the inductor FB2 is connected to the π filter to filter out electromagnetic interference other than the cutoff frequency of the π filter. The input terminal of the first ferrite bead FB1 is connected to the input terminal of the charge guidance signal collecting circuit, the output terminal of the first ferrite bead FB1 is connected to the input terminal of the inductor FB2, the output terminal of the inductor FB2 is connected to the input terminal of the pre-stage voltage divider circuit, one terminal of the first capacitor C1 is connected to the input terminal of the first ferrite bead FB1, the other terminal of the first capacitor C1 is connected to the protective ground terminal, one terminal of the second capacitor C2 is connected to the output terminal of the first ferrite bead FB1, and the other terminal of the second capacitor C2 is connected to the protective ground terminal. By directly connecting the first capacitor C1 and the second capacitor C2 of the π-type filter to the protective ground terminal, interference with the secondary circuit (i.e., the pre-stage voltage divider circuit 20) can be minimized.

[0043] In order to ensure that inductor FB2 can eliminate electromagnetic interference at frequencies other than the cutoff frequency of the π filter, it is necessary to first determine the cutoff frequency of the π filter and then select an inductor FB2 with appropriate parameters. For example, if the cutoff frequency of the π filter is 50 Hz, it is necessary to select an inductor FB2 that can eliminate interference in the 0 to 50 Hz range. In other embodiments, depending on actual needs, the first ferrite bead FB1 may be replaced with an inductor, and the inductor FB2 may be replaced with a ferrite bead.

[0044] Those skilled in the art will appreciate that in other embodiments, the pre-stage voltage divider circuit 20 may be replaced by any other appropriate DC step-down circuit, the signal amplifier filter circuit 30 may be replaced by any other appropriate filter amplifier circuit, and the voltage divider circuit 40 may be replaced by any other appropriate DC step-down circuit.

[0045] For example, in some embodiments, the voltage divider circuit 40 may be replaced with a variable DC converter circuit, and the controller may obtain the output voltage of the DC converter circuit and compare it with a target value. If the output voltage of the DC converter circuit does not match the target value, the controller (e.g., an MCU, single-chip microcomputer, etc.) may output a pulse signal to adjust the duty cycle of the switching transistor of the DC converter circuit until the output voltage of the DC converter circuit matches the target value, thereby achieving automatic control. This control method is more accurate and efficient and eliminates the need for manual adjustment. Here, if the charging guidance signal collection circuit is applied to an on-board charging inlet for a new energy vehicle, the controller may be an on-board charging controller. If the charging guidance signal collection circuit is applied to a charging station, the controller may be a charging station controller. This can be advantageous for making full use of original components and reducing implementation costs.

[0046] For convenience of description, the charging guidance signal collection circuit will be described by dividing it into various units according to their functions. Of course, in implementing the present invention, the functions of each unit may be realized by the same or multiple pieces of software and / or hardware.

[0047] 7, in some embodiments, the charging guidance signal collection circuit further includes a second ferrite bead FB3, one end of which is connected to the ground terminal of the charging guidance signal collection circuit and the other end of which is connected to the protective ground terminal, and the second ferrite bead FB3 may provide high-frequency isolation between the ground terminal and the protective ground terminal, thereby satisfying the requirements for anti-interference connection and common effective connection between the protective ground terminal and the ground terminal.

[0048] As described above, the charging guidance signal collection circuit of the embodiment of the present invention is applicable to collecting all conventional charging guidance signals, has strong anti-interference capability, and can ensure normal charging of new energy vehicles in various complex environments. The application scenario of the charging guidance signal collection circuit of the embodiment of the present invention is flexible, and it also leaves room for modification to accommodate future changes in charging guidance signal specifications, and the modification work is very simple.

[0049] As shown in FIG. 8 , an embodiment of the present invention further provides an on-board charging inlet 100 for a new energy vehicle, including a charging guidance signal receiving terminal and a charging guidance signal collecting circuit. The input terminal of the charging guidance signal collecting circuit is connected to the output terminal of the charging guidance signal receiving terminal, and the output terminal of the charging guidance signal collecting circuit may be connected to a charging guidance signal input pin of an on-board charging controller. The charging guidance signal receiving terminal is connected to a charging stand to charge the new energy vehicle. After the charging guidance signal receiving terminal is connected to the charging stand, the charging stand may send a charging guidance signal to the on-board charging controller. The charging guidance signal collecting circuit can adjust a charging guidance signal of any standard to a voltage value that meets the electrical requirements of the charging guidance signal input pin of the on-board charging controller, allowing new energy vehicles to adapt to the charging guidance signal standards of new energy vehicles in different countries / regions, thereby eliminating or alleviating the problem of difficulties in normal charging of new energy vehicles due to inconsistent charging guidance signal standards and further improving the charging adaptability of new energy vehicles.

[0050] In some embodiments of the on-board charging inlet for new energy vehicles, the charging guidance signal collecting circuit comprises: a signal amplification and filtering circuit for receiving the charging guidance signal and amplifying and filtering the received charging guidance signal; a voltage divider circuit having an input terminal connected to an output terminal of the signal amplifying and filtering circuit, for adjusting the charging guidance signal processed by the signal amplifying and filtering circuit to a target value which is a voltage value that satisfies an electrical requirement of a charging guidance signal input pin of the on-board charging controller; The voltage divider circuit includes at least two series-connected variable resistors, and the resistance value of the variable resistors may be variable according to the electrical requirements of the charge guidance signal input pin.

[0051] In some embodiments of the on-board charging inlet for new energy vehicles, the voltage divider circuit includes a first variable resistor and a second variable resistor connected in series, one end of the first variable resistor is connected to an output end of the signal amplifying and filtering circuit, the other end of the first variable resistor is connected to one end of the second variable resistor, and the other end of the second variable resistor is connected to a wire ground terminal, and a third connection point between the first variable resistor and the second variable resistor forms an output end of the charging guidance signal collecting circuit.

[0052] In some embodiments of the on-board charging inlet for new energy vehicles, the impedance ratio between the first variable resistor and the second variable resistor is 52.3 or greater.

[0053] In some embodiments of the onboard charging inlet for new energy vehicles, the signal amplifying / filtering circuit should have an appropriately large amplification factor to provide a voltage division space for the subsequent voltage dividing circuit, for example, in some embodiments, the amplification factor of the signal amplifying / filtering circuit is at least 20. To improve the filtering effect, the smaller the filter cutoff frequency of the signal amplifying / filtering circuit, the better. Specifically, the smaller the filter cutoff frequency, the wider the coverage range for elimination of electromagnetic interference and the stronger the electromagnetic interference prevention capability. However, considering the implementation cost, the filter cutoff frequency of the signal amplifying / filtering circuit is preferably 10 to 50 Hz.

[0054] In some embodiments of the on-board charging inlet for new energy vehicles, the charging guidance signal collecting circuit comprises: The charging guidance signal is further provided with a front-stage voltage dividing circuit, the output terminal of which is connected to the input terminal of the signal amplifying filter circuit, for receiving the charging guidance signal, and for reducing the charging guidance signal by a voltage dividing method to provide an amplifying space for the signal amplifying filter circuit.

[0055] In some embodiments of the on-board charging inlet for new energy vehicles, the step-down factor of the pre-stage voltage divider circuit is at least 20 times.

[0056] In some embodiments of the on-board charging inlet for new energy vehicles, the charging guidance signal collecting circuit comprises: The charging guidance signal collecting circuit further includes a filter circuit, the output of which is connected to the input of the previous voltage dividing circuit, and the input of which is connected to the input of the charging guidance signal collecting circuit, for filtering out electromagnetic interference in the original charging guidance signal to obtain the charging guidance signal.

[0057] In some embodiments of the on-board charging inlet for new energy vehicles, the filter circuit includes a first capacitor, a second capacitor, a first ferrite bead, and an inductor, where the first capacitor, the second capacitor, and the first ferrite bead form a π filter to filter out high-frequency electromagnetic interference in the original charging guidance signal, and the inductor is connected to the π filter to filter out electromagnetic interference other than the cutoff frequency of the π filter.

[0058] In some embodiments of the on-board charging inlet for new energy vehicles, the input end of the first ferrite bead is the input end of the charging guidance signal collection circuit, the output end of the first ferrite bead is connected to the input end of the inductor, the output end of the inductor is connected to the input end of the pre-stage voltage divider circuit, one end of the first capacitor is connected to the input end of the first ferrite bead, the other end of the first capacitor is connected to the protective ground terminal, one end of the second capacitor is connected to the output end of the first ferrite bead, and the other end of the second capacitor is connected to the protective ground terminal.

[0059] In some embodiments of the on-board charging inlet for new energy vehicles, the pre-stage voltage divider circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the output end of the filter circuit, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the wire ground terminal, and a first connection point between the first resistor and the second resistor forms the output end of the pre-stage voltage divider circuit.

[0060] In some embodiments of the on-board charging inlet for new energy vehicles, the signal amplification filter circuit includes an operational amplifier, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor. The forward input terminal of the operational amplifier is connected to the output terminal of the previous stage voltage divider circuit, the output terminal of the operational amplifier is connected to the input terminal of the voltage divider circuit, one end of the third resistor is connected to the output terminal of the operational amplifier, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to the wire ground terminal, and the backward input terminal of the operational amplifier is connected to a second connection point which is the connection point between the third resistor and the fourth resistor. The positive power supply pin of the operational amplifier is connected to a DC power supply, and the negative power supply pin of the operational amplifier is connected to the wire ground terminal. The third resistor and the fourth resistor form an amplification factor adjustment circuit for the operational amplifier. One end of the third capacitor is connected to the same input terminal of the operational amplifier, and the other end of the third capacitor is connected to the wire ground terminal. The third capacitor filters out electromagnetic interference at the same input terminal of the operational amplifier. One end of the fourth capacitor is connected to the output terminal of the operational amplifier, and the other end of the fourth capacitor is connected to the second connection point. The fourth capacitor filters out electromagnetic interference at the output terminal of the operational amplifier.

[0061] In some embodiments of the on-board charging inlet for new energy vehicles, the charging guidance signal collection circuit further includes a second ferrite bead, one end of the second ferrite bead is connected to the wire ground terminal of the charging guidance signal collection circuit, and the other end of the second ferrite bead is connected to the protective ground terminal, so that the second ferrite bead achieves high-frequency isolation between the wire ground terminal and the protective ground terminal.

[0062] 9, an embodiment of the present invention further provides a charging station 200 in which a charging guidance signal output terminal and a charging guidance signal collection circuit are arranged. The input terminal of the charging guidance signal collection circuit may be connected to the charging guidance signal output terminal, and the output terminal of the charging guidance signal collection circuit may be connected to the charging guidance signal receiving terminal of an on-board charging inlet for a new energy vehicle. After the output end of the charging guidance signal collecting circuit is matched with the charging guidance signal receiving terminal of the on-board charging inlet for new energy vehicles, the charging guidance signal output from the charging guidance signal generating circuit of the charging station 200 is provided to the charging guidance signal collecting circuit via the charging guidance signal output terminal for processing. The charging guidance signal collecting circuit can adjust the charging guidance signal of any standard to a voltage value that meets the electrical requirements of the charging guidance signal input pin of any on-board charging controller, so that the charging station 200 can meet (or match) the electrical requirements of the charging guidance signal input pin of any on-board charging controller. In other words, by allowing the charging station 200 to charge new energy vehicles that adopt different charging guidance signal standards, the problem of difficulty in normal charging of new energy vehicles due to inconsistent charging guidance signal standards is resolved or alleviated, and further the charging adaptability of new energy vehicles is improved.

[0063] In some embodiments of the charging station, the charging guidance signal collection circuitry comprises: a signal amplification and filtering circuit for receiving the charging guidance signal and amplifying and filtering the received charging guidance signal; a voltage divider circuit having an input terminal connected to an output terminal of the signal amplifying and filtering circuit, for adjusting the charging guidance signal processed by the signal amplifying and filtering circuit to a target value which is a voltage value that satisfies an electrical requirement of a charging guidance signal input pin of the on-board charging controller; The voltage divider circuit includes at least two series-connected variable resistors, and the resistance value of the variable resistors may be variable according to the electrical requirements of the charge guidance signal input pin.

[0064] In some embodiments of the charging station, the voltage divider circuit includes a first variable resistor and a second variable resistor connected in series, one end of the first variable resistor is connected to an output end of the signal amplifying and filtering circuit, the other end of the first variable resistor is connected to one end of the second variable resistor, and the other end of the second variable resistor is connected to the power line ground terminal, and a third connection point between the first variable resistor and the second variable resistor forms an output end of the charging guidance signal collecting circuit.

[0065] In some embodiments of the charging station, the impedance ratio between the first variable resistor and the second variable resistor is 52.3 or greater.

[0066] In some embodiments of the charging station, the amplification factor of the signal amplifying and filtering circuit is at least 20 times, and the filter cutoff frequency of the signal amplifying and filtering circuit is 10 to 50 Hz.

[0067] In some embodiments of the charging station, the charging guidance signal collection circuitry comprises: The charging guidance signal is further provided with a front-stage voltage dividing circuit having an output terminal connected to an input terminal of the signal amplifying filter circuit, for receiving the charging guidance signal and reducing the charging guidance signal in a voltage dividing manner to provide an amplifying space for the signal amplifying filter circuit.

[0068] In some charging station embodiments, the step-down factor of the pre-divider circuit is at least 20 times.

[0069] In some embodiments of the charging station, the charging guidance signal collection circuitry comprises: The charging guidance signal collecting circuit further includes a filter circuit, the output of which is connected to the input of the previous voltage dividing circuit, and the input of which is connected to the input of the charging guidance signal collecting circuit, for filtering out electromagnetic interference in the original charging guidance signal to obtain the charging guidance signal.

[0070] In some embodiments of the charging station, the filter circuit includes a first capacitor, a second capacitor, a first ferrite bead, and an inductor, where the first capacitor, the second capacitor, and the first ferrite bead form a π filter to remove high-frequency electromagnetic interference in the original charging guidance signal, and the inductor is connected to the π filter to remove electromagnetic interference other than at a cutoff frequency of the π filter.

[0071] In some embodiments of the charging station, the input end of the first ferrite bead is connected to the input end of the charging guidance signal collection circuit, the output end of the first ferrite bead is connected to the input end of the inductor, the output end of the inductor is connected to the input end of the pre-stage voltage divider circuit, one end of the first capacitor is connected to the input end of the first ferrite bead, the other end of the first capacitor is connected to the protective ground terminal, one end of the second capacitor is connected to the output end of the first ferrite bead, and the other end of the second capacitor is connected to the protective ground terminal.

[0072] In some embodiments of the charging station, the pre-stage voltage divider circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the output end of the filter circuit, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to the power line ground terminal, and a first connection point between the first resistor and the second resistor forms the output end of the pre-stage voltage divider circuit.

[0073] In some embodiments of the charging station, the signal amplifying and filtering circuit includes an operational amplifier, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor, wherein the indirect input terminal of the operational amplifier is connected to the output terminal of the previous stage voltage dividing circuit, the output terminal of the operational amplifier is connected to the input terminal of the voltage dividing circuit, one terminal of the third resistor is connected to the output terminal of the operational amplifier, the other terminal of the third resistor is connected to one terminal of the fourth resistor, the other terminal of the fourth resistor is connected to the power line ground terminal, and the reverse input terminal of the operational amplifier is connected to a second connection point which is a connection point between the third resistor and the fourth resistor. The positive power supply pin of the operational amplifier is connected to a DC power supply, the negative power supply pin of the operational amplifier is connected to the wire ground terminal, the third resistor and the fourth resistor form an amplification factor adjustment circuit of the operational amplifier, one end of the third capacitor is connected to the same input terminal of the operational amplifier, the other end of the third capacitor is connected to the wire ground terminal, the third capacitor filters out electromagnetic interference at the same input terminal of the operational amplifier, one end of the fourth capacitor is connected to the output terminal of the operational amplifier, the other end of the fourth capacitor is connected to the second connection point, and the fourth capacitor filters out electromagnetic interference at the output terminal of the operational amplifier.

[0074] In some embodiments of the charging station, the charging guidance signal collection circuit further includes a second ferrite bead, one end of the second ferrite bead is connected to the wire ground terminal of the charging guidance signal collection circuit, and the other end of the second ferrite bead is connected to the protective ground terminal, so that the second ferrite bead achieves high-frequency isolation between the wire ground terminal and the protective ground terminal.

[0075] It should also be understood that in the embodiments of the present invention, the term "and / or" is simply a relational relationship for describing related objects, and represents that three relations may exist. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the text generally represents that the related objects before and after it are in an "or" relationship.

[0076] Each embodiment of the present invention is described in a progressive manner, and the same or similar parts between the embodiments may be referred to, and each embodiment focuses on the differences from other embodiments. In particular, the core improvements of the embodiment of the device (i.e., on-board charging inlet and charging stand for new energy vehicles) are basically similar to those of the embodiment of the charging guidance signal collection circuit, so they will only be briefly described, and reference may be made to the partial description of the embodiment of the charging guidance signal collection circuit for relevant parts.

[0077] In the description of the present invention, the use of reference terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described with reference to the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, general expressions for the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or characteristics may be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, unless mutually inconsistent, those skilled in the art may refer to and combine different embodiments or examples and features of different embodiments or examples described in the present invention.

[0078] The above description is merely an example of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the technical spirit and principles of the present application should be included within the scope of the claims of the present application. [Explanation of symbols]

[0079] 10 Filter Circuit 20 Pre-stage voltage divider circuit 30 Signal Amplification Filter Circuit 40 Voltage divider circuit R1 First resistor R2 Second resistor R3 Third resistor R4 Fourth resistor R5 First variable resistor R6 Second variable resistor C1 First capacitor C2 Second capacitor C3 Third capacitor C4 Fourth capacitor FB1 First ferrite bead FB2 inductor FB3 Second ferrite bead UA1 operational amplifier 100 On-board charging inlet for new energy vehicles 200 charging stations

Claims

1. A charging guidance signal collecting circuit, a signal amplification and filtering circuit for receiving the charging guidance signal and amplifying and filtering the received charging guidance signal; a voltage divider circuit having an input terminal connected to an output terminal of the signal amplifying and filtering circuit, for adjusting the charge guidance signal processed by the signal amplifying and filtering circuit to a target value which is a voltage value that satisfies the electrical requirements of the charge guidance signal input pin of an on-board charging controller, the voltage divider circuit including at least two series-connected variable resistors, the resistance values ​​of the variable resistors being variable according to the electrical requirements of the charge guidance signal input pin; a front-stage voltage dividing circuit having an output terminal connected to an input terminal of the signal amplifying filter circuit, for receiving a charging guidance signal, and for reducing the charging guidance signal by a voltage dividing method to provide an amplifying space for the signal amplifying filter circuit.

2. 2. The charging guidance signal collecting circuit according to claim 1, wherein the voltage dividing circuit includes a first variable resistor and a second variable resistor connected in series, one end of the first variable resistor is connected to an output end of the signal amplifying filter circuit, the other end of the first variable resistor is connected to one end of the second variable resistor, and the other end of the second variable resistor is connected to a wire ground terminal, and a third connection point between the first variable resistor and the second variable resistor forms an output end of the charging guidance signal collecting circuit.

3. 3. The charging guidance signal collecting circuit according to claim 2, wherein an impedance ratio between the first variable resistor and the second variable resistor is 52.3 or more.

4. 2. The charging guidance signal collecting circuit according to claim 1, wherein the amplification factor of the signal amplifying and filtering circuit is at least 20 times, and the filter cutoff frequency of the signal amplifying and filtering circuit is 10 to 50 Hz.

5. 2. The charging guidance signal collecting circuit according to claim 1, wherein the step-down factor of the pre-stage voltage dividing circuit is at least 20 times.

6. 2. The charging guidance signal collecting circuit according to claim 1, further comprising: a filter circuit having an output terminal connected to an input terminal of the front-stage voltage dividing circuit, an input terminal of the filter circuit being an input terminal of the charging guidance signal collecting circuit, for removing electromagnetic interference in the original charging guidance signal to obtain the charging guidance signal.

7. 7. The charging guidance signal collection circuit according to claim 6, wherein the filter circuit includes a first capacitor, a second capacitor, a first ferrite bead, and an inductor, wherein the first capacitor, the second capacitor, and the first ferrite bead form a π-type filter to remove high-frequency electromagnetic interference in the original charging guidance signal, and the inductor is connected to the π-type filter to remove electromagnetic interference at a frequency other than a cutoff frequency of the π-type filter.

8. 8. The charge guidance signal collection circuit according to claim 7, wherein an input end of the first ferrite bead is an input end of the charge guidance signal collection circuit, an output end of the first ferrite bead is connected to an input end of the inductor, an output end of the inductor is connected to an input end of the pre-stage voltage divider circuit, one end of the first capacitor is connected to the input end of the first ferrite bead, the other end of the first capacitor is connected to a protective ground terminal, one end of the second capacitor is connected to the output end of the first ferrite bead, and the other end of the second capacitor is connected to the protective ground terminal.

9. 7. The charging guidance signal collecting circuit according to claim 6, wherein the pre-stage voltage dividing circuit includes a first resistor and a second resistor, one end of the first resistor is connected to the output end of the filter circuit, the other end of the first resistor is connected to one end of the second resistor, and the other end of the second resistor is connected to a wire ground terminal, and a first connection point between the first resistor and the second resistor forms an output end of the pre-stage voltage dividing circuit.

10. The signal amplifying and filtering circuit includes an operational amplifier, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor, wherein the inverting input terminal of the operational amplifier is connected to the output terminal of the pre-stage voltage dividing circuit, the output terminal of the operational amplifier is connected to the input terminal of the voltage dividing circuit, one end of the third resistor is connected to the output terminal of the operational amplifier, the other end of the third resistor is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to a wire ground terminal, the inverting input terminal of the operational amplifier is connected to a second connection point which is a connection point between the third resistor and the fourth resistor, a positive power supply pin of the operational amplifier is connected to a DC power supply, 2. The charging guidance signal collecting circuit according to claim 1, wherein: a negative power supply pin of the amplifier is connected to a wire ground terminal; the third resistor and the fourth resistor form an amplification factor adjusting circuit of the operational amplifier; one end of the third capacitor is connected to a parallel input terminal of the operational amplifier and the other end of the third capacitor is connected to a wire ground terminal, the third capacitor filters out electromagnetic interference at the parallel input terminal of the operational amplifier; one end of the fourth capacitor is connected to an output terminal of the operational amplifier and the other end of the fourth capacitor is connected to the second connection point, the fourth capacitor filters out electromagnetic interference at the output terminal of the operational amplifier.

11. 2. The charging guidance signal collection circuit according to claim 1, further comprising a second ferrite bead, one end of which is connected to the wire ground terminal of the charging guidance signal collection circuit and the other end of which is connected to the protective ground terminal, for realizing high-frequency isolation between the wire ground terminal and the protective ground terminal.

12. a charging guidance signal receiving terminal; and a charging guidance signal collecting circuit according to any one of claims 1 to 11, wherein an input terminal of the charging guidance signal receiving terminal is connected to an output terminal of the charging guidance signal receiving terminal.

13. a charging guidance signal output terminal; and a charging guidance signal collecting circuit according to any one of claims 1 to 11, the output terminal of which is connected to the input terminal of the charging guidance signal output terminal.

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