Control guide sampling circuit and charging pile

Abstract

The utility model provides a control guiding sampling circuit and a charging pile, the control guiding sampling circuit is connected with a voltage detection point, the control guiding sampling circuit comprises a first voltage dividing conversion module, a second voltage dividing conversion module and a main control chip, the first voltage dividing conversion module is used for dividing the negative voltage of the voltage detection point, and the second voltage dividing conversion module is used for dividing the negative voltage of the voltage detection point; reversing the divided first sub-voltage, and inputting the reversed first voltage to the main control chip; the second voltage division conversion module is used for dividing the positive voltage of the voltage detection point, amplifying a second sub-voltage after voltage division, and inputting the amplified second voltage to the main control chip; the main control chip is used for determining the charging state represented by the voltage detection point according to the first voltage or the second voltage; the first voltage and the second voltage are in a voltage input range of the main control chip.

Description

Technical Field

[0001] The utility model relates to a charging pile technology, in particular to a control guidance sampling circuit and a charging pile. Background Art

[0002] As new energy vehicle technology becomes increasingly mature, charging piles play a vital role in vehicle charging.

[0003] In the related art, when the charging pile interacts with the car, a control guidance circuit is needed to judge the charging status of the car. In actual applications, the control guidance sampling circuit inside the control guidance circuit samples the voltage at the detection point, and judges the charging status of the car based on the sampled voltage. Since the voltage range of the sampled voltage is usually plus or minus 12V, if it is processed directly, the subsequent chip will be damaged. To solve this problem, the conventional circuit method is to convert the sampled voltage of plus or minus 12V into the chip voltage input range of 0 to VCC for subsequent processing. However, this method causes the voltage range corresponding to the sampled voltage to be relatively small, which is easy to cause misjudgment. Utility Model Content

[0004] The utility model provides a control guidance sampling circuit and a charging pile.

[0005] The technical solution of the utility model is achieved in this way:

[0006] The utility model provides a control-guided sampling circuit, characterized in that the control-guided sampling circuit is connected to a voltage detection point, and the control-guided sampling circuit comprises a first voltage-dividing conversion module, a second voltage-dividing conversion module and a main control chip, wherein the first voltage-dividing conversion module is respectively connected to the voltage detection point and the main control chip, and the second voltage-dividing conversion module is respectively connected to the voltage detection point and the main control chip;

[0007] The first voltage division conversion module is used to divide the negative voltage at the voltage detection point, reverse the divided first sub-voltage, and input the reversed first voltage to the main control chip;

[0008] The second voltage division conversion module is used to divide the positive voltage of the voltage detection point, amplify the divided second sub-voltage, and input the amplified second voltage to the main control chip;

[0009] The main control chip is used to determine the charging state represented by the voltage detection point according to the first voltage or the second voltage; the first voltage and the second voltage are within the voltage input range of the main control chip.

[0010] In some embodiments, the control guidance sampling circuit also includes a first diode and a second diode, the positive electrode of the first diode is grounded via the first voltage divider conversion module, and the negative electrode is connected to the voltage detection point; the positive electrode of the second diode is connected to the voltage detection point, and the negative electrode is grounded via the second voltage divider conversion module.

[0011] In some embodiments, the first voltage divider conversion module includes a first voltage divider module and an operational amplifier module, and the second voltage divider conversion module includes a second voltage divider module and the operational amplifier module; one end of the first voltage divider module is connected to the positive electrode of the first diode, and the other end is connected to the operational amplifier module, one end of the second voltage divider module is connected to the negative electrode of the first diode, and the other end is connected to the operational amplifier module, and the other end of the operational amplifier module is connected to the main control chip.

[0012] In some embodiments, the first voltage divider module is used to divide the negative voltage of the voltage detection point to obtain a first sub-voltage; the second voltage divider module is used to divide the positive voltage of the voltage detection point to obtain a second sub-voltage; the absolute value of the first sub-voltage is equal to twice the absolute value of the second sub-voltage.

[0013] In some embodiments, the first voltage-dividing module includes at least two first voltage-dividing resistors connected in series, one end of the at least two first voltage-dividing resistors connected in series is connected to the anode of the first diode, and the other end is grounded; the first voltage-dividing resistor connected to the anode of the first diode has its other end connected to the operational amplifier module.

[0014] In some embodiments, the second voltage-dividing module includes at least two second voltage-dividing resistors connected in series, one end of the at least two second voltage-dividing resistors connected in series is connected to the cathode of the second diode, and the other end is grounded; the second voltage-dividing resistor connected to the cathode of the second diode has its other end connected to the operational amplifier module.

[0015] In some embodiments, the operational amplifier module includes a first operational amplifier, a negative input terminal of the first operational amplifier is connected to the first voltage divider module, a positive input terminal is connected to the second voltage divider module, and an output terminal is connected to the main control chip.

[0016] In some embodiments, the operational amplifier module includes a second operational amplifier and a third operational amplifier; the negative input terminal of the second operational amplifier is connected to the first voltage divider module, the positive input terminal is grounded, and the output terminal is connected to the main control chip; the positive input terminal of the third operational amplifier is connected to the second voltage divider module, the negative input terminal is grounded, and the output terminal is connected to the main control chip.

[0017] In some embodiments, the operational amplifier module includes a first follower amplifier and a fourth operational amplifier; the positive input terminal of the first follower amplifier is connected to the first voltage divider module, and the output terminal is connected to the negative input terminal of the fourth operational amplifier; the positive input terminal of the fourth operational amplifier is connected to the second voltage divider module, and the output terminal is connected to the main control chip.

[0018] In some embodiments, the operational amplifier module includes a second follower amplifier, a fifth operational amplifier and a sixth operational amplifier; the positive input terminal of the second follower amplifier is connected to the first voltage divider module, and the output terminal is connected to the negative input terminal of the fifth operational amplifier, the positive input terminal of the fifth operational amplifier is grounded, and the output terminal is connected to the main control chip; the positive input terminal of the sixth operational amplifier is connected to the second voltage divider module, the negative input terminal is grounded, and the output terminal is connected to the main control chip.

[0019] The utility model also provides a charging pile, which includes the aforementioned control guidance sampling circuit.

[0020] The utility model provides a control guidance sampling circuit and a charging pile. The control guidance sampling circuit is connected to a voltage detection point. The control guidance sampling circuit comprises a first voltage division conversion module, a second voltage division conversion module and a main control chip. The first voltage division conversion module is used to divide the negative voltage of the voltage detection point, reverse the first sub-voltage after the voltage division, and input the reversed first voltage to the main control chip; the second voltage division conversion module is used to divide the positive voltage of the voltage detection point, amplify the second sub-voltage after the voltage division, and input the amplified second voltage to the main control chip; the main control chip is used to determine the charging state represented by the voltage detection point according to the first voltage or the second voltage; the first voltage and the second voltage are within the voltage input range of the main control chip.

[0021] It can be seen that in the present invention, the negative voltage and positive voltage of the voltage detection point are separately processed by the first voltage division conversion module and the second voltage division conversion module respectively and input into the main control chip for subsequent judgment; that is, when the voltage range of the voltage detection point is positive or negative 12V, it is only necessary to convert the negative voltage of -12V to 0V into the voltage input range of 0 to VCC of the main control chip, and convert the positive voltage of 0 to 12V into the voltage input range of 0 to VCC of the main control chip. Compared with directly converting the sampling voltage of positive or negative 12V to 0 to VCC, the present invention can effectively improve the voltage range corresponding to the sampling voltage and reduce the possibility of misjudgment of the main control chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1This is an application scenario diagram of a control guidance sampling circuit provided by the utility model;

[0023] Figure 2 A first structural schematic diagram of a control guidance sampling circuit provided by the utility model;

[0024] Figure 3 A second structural schematic diagram of the control guidance sampling circuit provided by the utility model;

[0025] Figure 4 A third structural schematic diagram of the control guidance sampling circuit provided by the utility model;

[0026] Figure 5 A fourth structural schematic diagram of the control guidance sampling circuit provided by the utility model;

[0027] Figure 6 A fifth structural schematic diagram of the control guidance sampling circuit provided by the utility model;

[0028] Figure 7 A sixth structural schematic diagram of the control guidance sampling circuit provided by the utility model;

[0029] Fig. 8A A schematic diagram of the first voltage waveform corresponding to the main control chip provided by the utility model;

[0030] Figure 8B A schematic diagram of the second voltage waveform corresponding to the main control chip provided by the utility model;

[0031] Figure 8C A schematic diagram of the third voltage waveform corresponding to the main control chip provided by the utility model;

[0032] Fig.9A A schematic diagram of the fourth voltage waveform corresponding to the main control chip provided by the utility model;

[0033] Fig. 9B A schematic diagram of the fifth voltage waveform corresponding to the main control chip provided by the utility model;

[0034] Fig. 9C A schematic diagram of the sixth voltage waveform corresponding to the main control chip provided by the utility model;

[0035] Fig.10 It is a structural schematic diagram of a control and guidance circuit of the utility model;

[0036] Fig.11 The utility model is a schematic diagram of the structure of a charging pile. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0039] Figure 1 This is an application scenario diagram of a control guidance sampling circuit provided by the utility model, such as Figure 1 As shown, the control guidance sampling circuit 1 is a partial circuit in the control guidance circuit 10, and the control guidance circuit 10 can be applied to a charging pile 11; wherein one end of the charging pile 11 is connected to an external power source 12, and the other end is connected to a charging object 13.

[0040] Here, the charging pile 11 can be an AC charging pile or a DC charging pile, and the present invention does not limit this.

[0041] It should be noted that the charging object 13 may be a normal charging object, such as an electric car to be charged; it may also be an abnormal charging object, such as a child who accidentally touches the charging pile; therefore, to ensure charging safety, when the charging pile 11 is connected to the charging object 13, it is necessary to determine whether the charging object 13 is a normal charging object, and if it is determined to be so, charge the charging object 13.

[0042] Below Figure 1 Based on Figure 2 The above process is described exemplarily.

[0043] For example, Figure 2 The first structural diagram of the control guidance sampling circuit provided by the utility model is as follows: Figure 2 As shown, the control guidance sampling circuit 1 is connected to the voltage detection point 14, and the control guidance sampling circuit 1 includes a first voltage division conversion module 15, a second voltage division conversion module 16 and a main control chip 17. The first voltage division conversion module 15 is connected to the voltage detection point 14 and the main control chip 17 respectively, and the second voltage division conversion module 16 is connected to the voltage detection point 14 and the main control chip 17 respectively; wherein,

[0044] The first voltage division conversion module 15 is used to divide the negative voltage of the voltage detection point 14, reverse the first sub-voltage after the voltage division, and input the reversed first voltage to the main control chip 17;

[0045] The second voltage division conversion module 16 is used to divide the positive voltage of the voltage detection point 14, amplify the divided second sub-voltage, and input the amplified second voltage to the main control chip 17;

[0046] The main control chip 17 is used to determine the charging state represented by the voltage detection point 14 according to the first voltage or the second voltage; the first voltage and the second voltage are within the voltage input range of the main control chip 17.

[0047] Here, the voltage detection point 14 is also called the control pilot (CP) detection point, and its voltage range is related to the relevant standards applicable to the control pilot circuit 10. By way of example, assuming that the applicable standard of the control pilot circuit 10 is the national standard for electric vehicle power batteries GB / T 18487.1-2023, the voltage range of the voltage detection point 14 is ±12V, which will be used as an example for explanation later.

[0048] Exemplarily, the main control chip 17 is also called a microcontroller unit (MCU) chip. Here, the model and packaging form of the MCU chip are not specifically limited. Among them, the voltage input range of the main control chip 17 is 0~VCC, and the value of VCC is usually 3.3V.

[0049] In the utility model, the control guidance sampling circuit 1 also includes a first diode and a second diode, wherein the positive electrode of the first diode is grounded via a first voltage divider conversion module 15, and the negative electrode is connected to a voltage detection point 14; the positive electrode of the second diode is connected to the voltage detection point 14, and the negative electrode is grounded via a second voltage divider conversion module 16.

[0050] It can be understood that due to the unidirectional conductivity of the diode, when the voltage at the voltage detection point 14 is negative, the first diode is in the on state and the second diode is in the off state. At this time, the first voltage divider conversion module 15 can detect the negative voltage at the voltage detection point 14; and when the voltage at the voltage detection point 14 is positive, the first diode is in the off state and the second diode is in the on state. At this time, the second voltage divider conversion module 16 can detect the positive voltage at the voltage detection point 14.

[0051] It can be seen that in the present invention, by setting two diodes in opposite directions in the circuit, the positive and negative voltages at the voltage detection point can be sampled separately, which facilitates the subsequent processing of the positive voltage and negative voltage, making the circuit implementation simpler.

[0052] In some embodiments, the first voltage divider conversion module 15 includes a first voltage divider module and an operational amplifier module, and the second voltage divider conversion module 16 includes a second voltage divider module and an operational amplifier module; one end of the first voltage divider module is connected to the positive electrode of the first diode, and the other end is connected to the operational amplifier module, one end of the second voltage divider module is connected to the negative electrode of the second diode, and the other end is connected to the operational amplifier module, and the other end of the operational amplifier module is connected to the main control chip 17.

[0053] In the utility model, the first voltage divider module is used to divide the negative voltage of the voltage detection point 14 to obtain a first sub-voltage; combined with the connection relationship between the first voltage divider module and the operational amplifier module, it can be seen that after obtaining the first sub-voltage, the first voltage divider module will input the first sub-voltage to the operational amplifier module, and reverse the first sub-voltage through the operational amplifier module to obtain the reversed first voltage, and then input the reversed first voltage to the main control chip 17.

[0054] Here, reversing the first sub-voltage means amplifying the first sub-voltage by one negative factor, that is, the first sub-voltage has the same voltage as the first voltage but has an opposite direction; wherein the value of the first voltage is between the voltage input range of 0 and VCC of the main control chip 17; for example, if the first sub-voltage is -2V, the first voltage is 2V.

[0055] It can be understood that since the voltage range of negative voltage is -12V~0, which is not within the voltage input range of the main control chip 17, the main control chip will be damaged if the negative voltage is not divided and reversed. Therefore, when the negative voltage is sampled, the sampled negative voltage is divided and reversed so that the voltage input to the main control chip is between 0 and VCC, thereby ensuring the safety of the main control chip.

[0056] In some embodiments, the first voltage divider module includes at least two first voltage divider resistors connected in series, one end of the at least two first voltage divider resistors connected in series is connected to the anode of the first diode, and the other end is grounded; the first voltage divider resistor connected to the anode of the first diode has its other end connected to the operational amplifier module.

[0057] Exemplarily, the number of first voltage-dividing resistors included in the first voltage-dividing module may be two or more, and the number may be set according to actual needs, which is not limited in the embodiment of the utility model.

[0058] The connection relationship of the first voltage dividing module is exemplarily described below by taking the example that the first voltage dividing module includes two first voltage dividing resistors.

[0059] Exemplarily, exemplary, Figure 3 The second structural diagram of the control guidance sampling circuit provided by the utility model is as follows: Figure 3 As shown, the first voltage-dividing module includes a first voltage-dividing resistor R1 and a first voltage-dividing resistor R2 connected in series, one end of the first voltage-dividing resistor R1 is connected to the positive electrode of the first diode D1, the common end of the first voltage-dividing resistor R1 and the first voltage-dividing resistor R2 is connected to the operational amplifier module (not shown in the figure), and the other end of the first voltage-dividing resistor R2 is grounded.

[0060] For example, in combination Figure 3As can be seen from the circuit connection relationship shown, the negative voltage at the voltage detection point 14 is input to the first voltage-dividing resistor R1 and the first voltage-dividing resistor R2 through the first diode D1, and the negative voltage is divided by the first voltage-dividing resistor R1 and the first voltage-dividing resistor R2 to obtain a first sub-voltage, and the first sub-voltage is input to the operational amplifier module for reverse operation; wherein, the voltage division process can refer to formula (1):

[0061] V1=(CP1-Vb1)*R2 / (R1+R2)(1)

[0062] Wherein, V1 represents the first sub-voltage, CP1 represents the negative voltage, and Vb1 represents the voltage drop of the first diode D1.

[0063] It can be seen that in the present invention, by dividing and reversing the sampled negative voltage, the negative voltage can be raised, so that the voltage input to the main control chip meets the processing requirements, ensuring the circuit performance.

[0064] In the utility model, the second voltage divider module is used to divide the positive voltage of the voltage detection point 14 to obtain a second sub-voltage; combined with the connection relationship between the second voltage divider module and the operational amplifier module, it can be seen that after obtaining the second sub-voltage, the second voltage divider module will input the second sub-voltage to the operational amplifier module, and the second sub-voltage will be amplified by the operational amplifier module to obtain the amplified second voltage, and the amplified second voltage will be input to the main control chip 17.

[0065] Here, amplifying the second sub-voltage refers to doubling the second sub-voltage, that is, the second voltage is twice the second sub-voltage; wherein the value of the second voltage is between the voltage input range of 0 and VCC of the main control chip 17; for example, if the second sub-voltage is 1V, the second voltage is 2V.

[0066] It can be understood that since the voltage range of the positive voltage is 0~12V, which exceeds the voltage range of the main control chip 17, the utility model divides and amplifies the positive voltage so that the voltage input to the main control chip is between 0~VCC to meet the processing requirements of the main control chip 17.

[0067] In some embodiments, the second voltage divider module includes at least two second voltage divider resistors connected in series, one end of the at least two second voltage divider resistors connected in series is connected to the cathode of the second diode, and the other end is grounded; the second voltage divider resistor connected to the cathode of the second diode has its other end connected to the operational amplifier module.

[0068] Exemplarily, the number of the second voltage-dividing resistors included in the second voltage-dividing module may be two or more, and the number may be set according to actual needs, which is not limited in the embodiment of the utility model.

[0069] Below Figure 3On this basis, taking the second voltage dividing module including two second voltage dividing resistors as an example, the connection relationship of the second voltage dividing module is exemplarily described.

[0070] For example, see Figure 3 The second voltage-dividing module includes a second voltage-dividing resistor R3 and a second voltage-dividing resistor R4 connected in series, one end of the second voltage-dividing resistor R3 is connected to the cathode of the second diode D2, the common end of the second voltage-dividing resistor R3 and the second voltage-dividing resistor R4 is connected to an operational amplifier module (not shown in the figure), and the other end of the second voltage-dividing resistor R4 is grounded.

[0071] For example, in combination Figure 3 As can be seen from the circuit connection relationship shown, the positive voltage at the voltage detection point 14 is input to the second voltage-dividing resistor R3 and the second voltage-dividing resistor R4 through the second diode D2, and the positive voltage is divided by the second voltage-dividing resistor R3 and the second voltage-dividing resistor R4 to obtain a second sub-voltage, and the second sub-voltage is input to the operational amplifier module for amplification; wherein, the voltage division process can refer to formula (2):

[0072] V2=(CP2-Vb2)*R4 / (R3+R4)(2)

[0073] Wherein, V2 represents the second sub-voltage, CP2 represents the positive voltage, and Vb2 represents the voltage drop of the second diode D2; if the second diode D2 is of the same model as the first diode D1, Vb2 is equal to Vb1.

[0074] It can be seen that in the present invention, by dividing and amplifying the sampled positive voltage, the voltage input to the main control chip meets the processing requirements, thereby ensuring circuit performance.

[0075] It should be noted that the absolute value of the first sub-voltage V1 is equal to twice the absolute value of the second sub-voltage V2, that is, both satisfy: |V1|=2|V2|. Since the second sub-voltage V2 is a positive value, it can be abbreviated as: |V1|=2V2.

[0076] In the present invention, the voltage divider module can be configured so that the first sub-voltage V1 and the second sub-voltage V2 satisfy the above relationship. Figure 2 , the resistance values ​​of the first voltage-dividing resistors in the first voltage-dividing module and the second voltage-dividing resistors in the second voltage-dividing module can be set so that |V1|=2V2.

[0077] It can be understood that when |V1|=2V2, the first voltage and the second voltage input to the main control chip 17 after being processed by the operational amplifier module are equal; at this time, the voltage received by the main control chip 17 is a DC voltage.

[0078] Exemplarily, assuming that the first sub-voltage is -2V, the second sub-voltage is 1V. At this time, the first voltage and the second voltage input to the main control chip 17 are both 2V.

[0079] In the present invention, the operational amplifier module can be implemented by a variety of different types of circuit structures. Each type of circuit structure is exemplarily described below.

[0080] In some embodiments, the operational amplifier module may include a first operational amplifier, a negative input terminal of the first operational amplifier is connected to the first voltage divider module, a positive input terminal is connected to the second voltage divider module, and an output terminal is connected to the main control chip.

[0081] Exemplarily, the operational amplifier module also includes a first input resistor, a feedback resistor and a second input resistor, wherein the first input resistor is connected to the negative input terminal of the first operational amplifier, the second input resistor is connected to the positive input terminal of the first operational amplifier, and the feedback resistor is connected between the negative input terminal and the output terminal of the first operational amplifier.

[0082] It should be noted that the first input resistor and the feedback resistor have the same resistance value. This is because when the two resistance values ​​are equal, the first operational amplifier can achieve the reverse processing of the first sub-voltage V1 and the double amplification of the second sub-voltage V2. Figure 4 Provide explanation.

[0083] For example, Figure 4 The third structural diagram of the control guidance sampling circuit provided by the utility model is as follows: Figure 4 As shown, the operational amplifier module includes a first operational amplifier U1, a common end of a first voltage-dividing resistor R1 and a first voltage-dividing resistor R2 is connected to a negative input end of the first operational amplifier U1 via a first input resistor R5, a common end of a second voltage-dividing resistor R3 and a second voltage-dividing resistor R4 is connected to a positive input end of the first operational amplifier U1 via a second input resistor R7, a feedback resistor R6 is connected between the negative input end and the output end of the first operational amplifier U1, and the output end of the first operational amplifier U1 is connected to a main control chip 17 (not shown in the figure).

[0084] In some embodiments, the operational amplifier module includes a second operational amplifier and a third operational amplifier; the negative input terminal of the second operational amplifier is connected to the first voltage divider module, the positive input terminal is grounded, and the output terminal is connected to the main control chip; the positive input terminal of the third operational amplifier is connected to the second voltage divider module, the negative input terminal is grounded, and the output terminal is connected to the main control chip.

[0085] Exemplarily, the operational amplifier module further includes two identical first input resistors, a feedback resistor, and a second input resistor. Here, the connection method of the first input resistor, the feedback resistor, and the second input resistor is the same as Figure 4The connection method shown is similar. For ease of understanding, the following Figure 5 Provide explanation.

[0086] For example, Figure 5 The fourth structural diagram of the control guidance sampling circuit provided by the utility model is as follows Figure 5 As shown, the operational amplifier module includes a second operational amplifier U2 and a third operational amplifier U3, the common end of the first voltage-dividing resistor R1 and the first voltage-dividing resistor R2 is connected to the negative input end of the second operational amplifier U2 via the first input resistor R5, the positive input end of the second operational amplifier U2 is grounded via the second input resistor R7, the output end is connected to the main control chip 17 (not shown in the figure), and the feedback resistor R6 is connected between the negative input end and the output end of the second operational amplifier U2; the common end of the second voltage-dividing resistor R3 and the second voltage-dividing resistor R4 is connected to the positive input end of the third operational amplifier U3 via another second input resistor R7, the negative input end of the third operational amplifier U3 is grounded via another first input resistor R5, the output end is connected to the main control chip 17, and another feedback resistor R6 is connected between the negative input end and the output end of the third operational amplifier U3.

[0087] In some embodiments, the operational amplifier module includes a first follower amplifier and a fourth operational amplifier; the positive input terminal of the first follower amplifier is connected to the first voltage divider module, and the output terminal is connected to the negative input terminal of the fourth operational amplifier; the positive input terminal of the fourth operational amplifier is connected to the second voltage divider module, and the output terminal is connected to the main control chip.

[0088] Exemplarily, the operational amplifier module further includes a first input resistor, a feedback resistor, and a second input resistor. Here, the connection method of the first input resistor, the feedback resistor, and the second input resistor is the same as Figure 4 The connection method shown is similar. For ease of understanding, the following Figure 6 Provide explanation.

[0089] For example, Figure 6 The fifth structural diagram of the control guidance sampling circuit provided by the utility model is as follows Figure 6 As shown, the operational amplifier module includes a first follower amplifier K1 and a fourth operational amplifier U4, the common end of the first voltage-dividing resistor R1 and the first voltage-dividing resistor R2 is connected to the negative input end of the fourth operational amplifier U4 via the first follower amplifier K1 and the first input resistor R5, the common end of the second voltage-dividing resistor R3 and the second voltage-dividing resistor R4 is connected to the positive input end of the fourth operational amplifier U4 via the second input resistor R7, the feedback resistor R6 is connected between the negative input end and the output end of the fourth operational amplifier U4, and the output end of the fourth operational amplifier U4 is connected to the main control chip 17 (not shown in the figure).

[0090] In some embodiments, the operational amplifier module includes a second follower amplifier, a fifth operational amplifier and a sixth operational amplifier; the positive input terminal of the second follower amplifier is connected to the first voltage divider module, and the output terminal is connected to the negative input terminal of the fifth operational amplifier, the positive input terminal of the fifth operational amplifier is grounded, and the output terminal is connected to the main control chip; the positive input terminal of the sixth operational amplifier is connected to the second voltage divider module, the negative input terminal is grounded, and the output terminal is connected to the main control chip.

[0091] Exemplarily, the operational amplifier module further includes two identical first input resistors, a feedback resistor, and a second input resistor. Here, the connection method of the first input resistor, the feedback resistor, and the second input resistor is the same as Figure 4 The connection method shown is similar. For ease of understanding, the following Figure 7 Provide explanation.

[0092] For example, Figure 7 The sixth structural diagram of the control guidance sampling circuit provided by the utility model is as follows Figure 7 As shown, the operational amplifier module includes a second follower amplifier K2, a fifth operational amplifier U5 and a sixth operational amplifier U6. The common end of the first voltage-dividing resistor R1 and the first voltage-dividing resistor R2 is connected to the negative input end of the fifth operational amplifier U5 via the second follower amplifier K2 and the first input resistor R5. The positive input end of the fifth operational amplifier U5 is grounded via the second input resistor R7, and the output end is connected to the main control chip 17 (not shown in the figure). The feedback resistor R6 is connected between the negative input end and the output end of the second operational amplifier U2; the common end of the second voltage-dividing resistor R3 and the second voltage-dividing resistor R4 is connected to the positive input end of the sixth operational amplifier U6 via another second input resistor R7, the negative input end of the sixth operational amplifier U6 is grounded via another first input resistor R5, and the output end is connected to the main control chip 17. Another feedback resistor R6 is connected between the negative input end and the output end of the sixth operational amplifier U6.

[0093] It should be noted that Figures 4 to 7 The functions of the control-guided sampling circuits shown are the same, that is, the reverse processing process and the double amplification processing process corresponding to the operational amplifier modules in each circuit are the same. Accordingly, the reverse processing process can refer to formula (3):

[0094] V1'=(CP1-Vb1)*R2 / (R1+R2)*(-R6 / R5)(3)

[0095] Wherein, V1' represents a first voltage, and the first input resistor R5 and the feedback resistor R6 satisfy: R5 = R6.

[0096] Accordingly, the double magnification process can refer to formula (4):

[0097] V2'=(CP2-Vb2)*R4 / (R3+R4)*(1+R6 / R5)(4)

[0098] Wherein, V2' represents the second voltage.

[0099] By way of example, according to the above content, when the voltage at the voltage detection point 14 is ±12V, by setting the resistance values ​​of the first voltage-dividing resistor R1, the first voltage-dividing resistor R2, the second voltage-dividing resistor R3 and the second voltage-dividing resistor R4, the first sub-voltage V1 and the second sub-voltage V2 satisfy: |V1|=2V2; when the first input resistor R5 and the feedback resistor R6 are equal, it can be seen from formula (3) and formula (4) that the first voltage V1' is equal to the second voltage V2'. In addition, since the voltage input range of the main control chip 17 is 0~VCC, the values ​​of the first voltage V1' and the second voltage V2' are between 0~VCC. At this time, the first voltage and the second voltage received by the main control chip 17 are DC voltages, such as Fig. 8A shown.

[0100] It can be understood that when the minimum negative voltage of the voltage detection point 14 is -12V, the voltage will not be divided due to the connection of the electric vehicle, and when the maximum positive voltage of the voltage detection point is 12V, the voltage will be divided due to the connection of the electric vehicle, so that the voltage of the voltage detection point will become 9V, 6V, etc. At this time, the voltage change of the second voltage received by the main control chip 17 is as follows: Figure 8B and Figure 8C shown.

[0101] In the present invention, the main control chip 17 can determine the charging state represented by the voltage detection point according to the voltage change of the received first voltage or the second voltage.

[0102] Exemplarily, the charging state represented by the voltage detection point 14 refers to the charging state corresponding to the charging object, which may include any of the following: not connected to the charging object, connected to an abnormal charging object, connected to a normal charging object, and charging a normal charging object.

[0103] For example, if the main control chip 17 determines that the positive voltage at the voltage detection point 14 does not exceed the normal threshold interval of 12V based on the second voltage, it means that there is no voltage division. At this time, it can be determined that the charging state is not connected to the charging object 13. Here, the normal threshold interval of 12V can be 12V±0.05V, or 12V±0.1V, etc.

[0104] Exemplarily, if the main control chip 17 determines that the voltage change value of the positive voltage at the voltage detection point 14 is greater than or equal to the first set threshold value based on the second voltage, it means that there is a voltage division situation, that is, the circuit is connected to a charging object 13. At this time, the main control chip 17 can continue to determine whether the charging object 13 is a normal charging object based on the first voltage.

[0105] Here, the first set threshold may be set to about 3V, for example, 2.9V, 3V or 3.1V, etc. Exemplarily, if the main control chip determines that the positive voltage changes from 12V to 9V according to the second voltage, it is determined that a charging object 13 is connected to the circuit.

[0106] Furthermore, if the main control chip 17 determines that the negative voltage at the voltage detection point 14 does not exceed the normal threshold interval of -12V based on the first voltage, it means that the charging object 13 is a normal charging object. This is because the diode in the electric vehicle has unidirectional conductivity and does not divide the negative voltage. At this time, it can be determined that the charging state is connected to a normal charging object. Otherwise, it is determined that the charging state is connected to an abnormal charging object. Here, the -12V normal threshold interval can be -12V±0.05V, or -12V±0.1V, etc.

[0107] Exemplarily, if the main control chip 17 determines that the circuit is connected to a normal charging object, and determines, based on the second voltage, that the voltage change value of the positive voltage at the voltage detection point 14 is greater than the second set threshold, it means that the normal charging object is ready for charging. At this time, the charging state can be determined as charging the normal charging object.

[0108] Here, the second set threshold may be set to about 3V, for example, 2.9V, 3V or 3.1V, etc. Exemplarily, if the main control chip 17 determines that the positive voltage changes from 9V to 6V according to the second voltage, it determines that the normally charged object can be charged.

[0109] It should be noted that if |V1|≠2V2 in the actual circuit, or the absolute values ​​of the maximum positive voltage and the minimum negative voltage at the voltage detection point 14 are not equal, for example, the maximum positive voltage is 12V and the minimum negative voltage is -11V, then the first voltage and the second voltage input to the main control chip 17 through the voltage divider module and the operational amplifier module will fluctuate in a small range and will no longer be DC voltages. The actual voltage waveform can be adjusted by the actual circuit. In addition, since the voltage input range of the main control chip 17 is 0~VCC, the values ​​of the first voltage V1' and the second voltage V2' are still between 0~VCC. At this time, the voltage received by the main control chip 17 is as follows: Fig.9A Shown

[0110] It can be understood that when the minimum negative voltage of the voltage detection point 14 is -11V, the voltage will not be divided due to the connection of the electric vehicle, and when the maximum positive voltage of the voltage detection point is 12V, the voltage will be divided due to the connection of the electric vehicle, so that the voltage at the voltage detection point will become 9V, 6V, etc. At this time, the voltage change received by the main control chip 17 is as follows: Fig. 9B and Fig. 9C shown.

[0111] It can be seen that in the present invention, the negative voltage and positive voltage at the voltage detection point are separately processed by the first voltage division conversion module and the second voltage division conversion module and input into the main control chip; that is, when the voltage range of the voltage detection point is positive or negative 12V, it is only necessary to convert the negative voltage of -12V to 0V into the voltage input range of 0 to VCC of the main control chip, and convert the positive voltage of 0 to 12V into the voltage input range of 0 to VCC of the main control chip. Compared with directly converting the sampling voltage of positive or negative 12V to 0 to VCC, the present invention can effectively improve the voltage range corresponding to the sampling voltage and greatly reduce the possibility of misjudgment of the main control chip.

[0112] The utility model also provides a control guidance circuit 10, such as Fig.10 As shown, the control steering circuit 10 includes the control steering sampling circuit 1 of any of the above schemes.

[0113] The utility model also provides a charging pile 11, such as Fig.11 As shown, the charging pile 11 includes the control guidance sampling circuit 1 of any of the above solutions.

[0114] As in the above-mentioned embodiment, the control-guide sampling circuit is connected to the voltage detection point, and the control-guide sampling circuit includes a first voltage-dividing conversion module, a second voltage-dividing conversion module and a main control chip, the first voltage-dividing conversion module is respectively connected to the voltage detection point and the main control chip, and the second voltage-dividing conversion module is respectively connected to the voltage detection point and the main control chip;

[0115] A first voltage division conversion module, used for dividing the negative voltage at the voltage detection point, reversing the divided first sub-voltage, and inputting the reversed first voltage to the main control chip;

[0116] A second voltage division conversion module is used to divide the positive voltage at the voltage detection point, amplify the divided second sub-voltage, and input the amplified second voltage to the main control chip;

[0117] The main control chip is used to determine the charging state represented by the voltage detection point according to the first voltage or the second voltage; the first voltage and the second voltage are within the voltage input range of the main control chip.

[0118] As in the aforementioned embodiment, the control guidance sampling circuit further includes a first diode and a second diode, wherein the anode of the first diode is grounded via a first voltage divider conversion module, and the cathode is connected to a voltage detection point; the anode of the second diode is connected to the voltage detection point, and the cathode is grounded via a second voltage divider conversion module.

[0119] As in the aforementioned embodiment, the first voltage divider conversion module includes a first voltage divider module and an operational amplifier module, and the second voltage divider conversion module includes a second voltage divider module and an operational amplifier module; one end of the first voltage divider module is connected to the positive electrode of the first diode, and the other end is connected to the operational amplifier module, one end of the second voltage divider module is connected to the negative electrode of the second diode, and the other end is connected to the operational amplifier module, and the other end of the operational amplifier module is connected to the main control chip.

[0120] As in the aforementioned embodiment, the first voltage divider module is used to divide the negative voltage at the voltage detection point to obtain a first sub-voltage; the second voltage divider module is used to divide the positive voltage at the voltage detection point to obtain a second sub-voltage; the absolute value of the first sub-voltage is equal to twice the absolute value of the second sub-voltage.

[0121] As in the aforementioned embodiment, the first voltage-dividing module includes at least two first voltage-dividing resistors connected in series, one end of the at least two first voltage-dividing resistors connected in series is connected to the anode of the first diode, and the other end is grounded; the first voltage-dividing resistor connected to the anode of the first diode has its other end connected to the operational amplifier module.

[0122] As in the aforementioned embodiment, the second voltage-dividing module includes at least two second voltage-dividing resistors connected in series, one end of the at least two second voltage-dividing resistors connected in series is connected to the cathode of the second diode, and the other end is grounded; the second voltage-dividing resistor connected to the cathode of the second diode has its other end connected to the operational amplifier module.

[0123] As in the above embodiment, the operational amplifier module includes a first operational amplifier, a negative input terminal of the first operational amplifier is connected to the first voltage divider module, a positive input terminal is connected to the second voltage divider module, and an output terminal is connected to the main control chip.

[0124] As in the aforementioned embodiment, the operational amplifier module includes a second operational amplifier and a third operational amplifier; the negative input terminal of the second operational amplifier is connected to the first voltage divider module, the positive input terminal is grounded, and the output terminal is connected to the main control chip; the positive input terminal of the third operational amplifier is connected to the second voltage divider module, the negative input terminal is grounded, and the output terminal is connected to the main control chip.

[0125] As in the aforementioned embodiment, the operational amplifier module includes a first follower amplifier and a fourth operational amplifier; the positive input terminal of the first follower amplifier is connected to the first voltage divider module, and the output terminal is connected to the negative input terminal of the fourth operational amplifier; the positive input terminal of the fourth operational amplifier is connected to the second voltage divider module, and the output terminal is connected to the main control chip.

[0126] As in the aforementioned embodiment, the operational amplifier module includes a second follower amplifier, a fifth operational amplifier and a sixth operational amplifier; the positive input terminal of the second follower amplifier is connected to the first voltage divider module, and the output terminal is connected to the negative input terminal of the fifth operational amplifier, the positive input terminal of the fifth operational amplifier is grounded, and the output terminal is connected to the main control chip; the positive input terminal of the sixth operational amplifier is connected to the second voltage divider module, the negative input terminal is grounded, and the output terminal is connected to the main control chip.

[0127] It should be noted that the relevant circuit structure diagrams provided in the present utility model are not limited to the above Figures 4 to 7 The present invention is not limited to the described circuit structure.

[0128] The above are only embodiments of the utility model, but they do not limit the patent scope of the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above specific implementations, or replace some of the technical features therein with equivalents. Any equivalent structure made by using the contents of the utility model specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of protection of the utility model patent.

[0129] It should be understood that "one embodiment" or "an embodiment" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the utility model. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in various embodiments of the utility model, the size of the serial number of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the utility model. The above-mentioned serial numbers of the utility model are only for description and do not represent the advantages and disadvantages of the embodiments.

[0130] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control-guided sampling circuit, characterized in that: The control guide sampling circuit is connected to the voltage detection point, and the control guide sampling circuit includes a first voltage division conversion module, a second voltage division conversion module and a main control chip, the first voltage division conversion module is respectively connected to the voltage detection point and the main control chip, and the second voltage division conversion module is respectively connected to the voltage detection point and the main control chip; The first voltage division conversion module is used to divide the negative voltage at the voltage detection point, reverse the divided first sub-voltage, and input the reversed first voltage to the main control chip; The second voltage division conversion module is used to divide the positive voltage of the voltage detection point, amplify the divided second sub-voltage, and input the amplified second voltage to the main control chip; The main control chip is used to determine the charging state represented by the voltage detection point according to the first voltage or the second voltage; the first voltage and the second voltage are within the voltage input range of the main control chip.

2. The circuit according to claim 1, characterized in that The control guidance sampling circuit also includes a first diode and a second diode, wherein the anode of the first diode is grounded via the first voltage division conversion module, and the cathode is connected to the voltage detection point; the anode of the second diode is connected to the voltage detection point, and the cathode is grounded via the second voltage division conversion module.

3. The circuit according to claim 2, characterized in that The first voltage divider conversion module includes a first voltage divider module and an operational amplifier module, and the second voltage divider conversion module includes a second voltage divider module and the operational amplifier module; one end of the first voltage divider module is connected to the positive electrode of the first diode, and the other end is connected to the operational amplifier module, one end of the second voltage divider module is connected to the negative electrode of the second diode, and the other end is connected to the operational amplifier module, and the other end of the operational amplifier module is connected to the main control chip.

4. The circuit according to claim 3, characterized in that The first voltage divider module is used to divide the negative voltage at the voltage detection point to obtain a first sub-voltage; the second voltage divider module is used to divide the positive voltage at the voltage detection point to obtain a second sub-voltage; the absolute value of the first sub-voltage is equal to twice the absolute value of the second sub-voltage.

5. The circuit according to claim 3, characterized in that The first voltage-dividing module includes at least two first voltage-dividing resistors connected in series, one end of the at least two first voltage-dividing resistors connected in series is connected to the anode of the first diode, and the other end is grounded; the first voltage-dividing resistor connected to the anode of the first diode has its other end connected to the operational amplifier module.

6. The circuit according to claim 3, characterized in that The second voltage-dividing module includes at least two second voltage-dividing resistors connected in series, one end of the at least two second voltage-dividing resistors connected in series is connected to the cathode of the second diode, and the other end is grounded; the second voltage-dividing resistor connected to the cathode of the second diode has its other end connected to the operational amplifier module.

7. The circuit according to any one of claims 3 to 6, characterized in that: The operational amplifier module includes a first operational amplifier, a negative input terminal of the first operational amplifier is connected to the first voltage divider module, a positive input terminal is connected to the second voltage divider module, and an output terminal is connected to the main control chip.

8. The circuit according to any one of claims 3 to 6, characterized in that: The operational amplifier module includes a second operational amplifier and a third operational amplifier; the negative input terminal of the second operational amplifier is connected to the first voltage divider module, the positive input terminal is grounded, and the output terminal is connected to the main control chip; the positive input terminal of the third operational amplifier is connected to the second voltage divider module, the negative input terminal is grounded, and the output terminal is connected to the main control chip.

9. The circuit according to any one of claims 3 to 6, characterized in that: The operational amplifier module includes a first follower amplifier and a fourth operational amplifier; the positive input terminal of the first follower amplifier is connected to the first voltage divider module, and the output terminal is connected to the negative input terminal of the fourth operational amplifier; the positive input terminal of the fourth operational amplifier is connected to the second voltage divider module, and the output terminal is connected to the main control chip.

10. The circuit according to any one of claims 3 to 6, characterized in that: The operational amplifier module includes a second follower amplifier, a fifth operational amplifier and a sixth operational amplifier; the positive input terminal of the second follower amplifier is connected to the first voltage divider module, and the output terminal is connected to the negative input terminal of the fifth operational amplifier, the positive input terminal of the fifth operational amplifier is grounded, and the output terminal is connected to the main control chip; the positive input terminal of the sixth operational amplifier is connected to the second voltage divider module, the negative input terminal is grounded, and the output terminal is connected to the main control chip.

11. A charging pile, characterized in that: The control-guided sampling circuit comprises the control-guided sampling circuit according to any one of claims 1 to 10.

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