Control guide circuit and charging pile

Abstract

The utility model provides a control guide circuit and a charging pile, the control guide circuit comprises a power supply module, a change-over switch, a voltage detection point and a master control module, the positive pole of the power supply module is connected with the first switching end of the change-over switch, the negative pole of the power supply module is connected with the second switching end of the change-over switch, and the voltage detection point is connected with the master control module. The fixed end of the change-over switch is connected with the main control module through the voltage detection point; and the main control module is used for determining the first voltage of the voltage detection point and controlling the connection state of the change-over switch according to the first voltage.

Description

Technical Field

[0001] The utility model relates to a charging pile technology, in particular to a control guidance 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 technology, when the charging pile interacts with the car, a control guidance circuit is needed to identify the object connected to the charging pile. The electric car will only be charged when it is determined that the object is an electric car rather than other media. Currently, many control guidance circuits implement corresponding functions through push-pull circuits. However, push-pull circuits have crossover distortion problems, which affect the stability of the control guidance circuit and make the control guidance circuit susceptible to external interference. Utility Model Content

[0004] The utility model provides a control guidance 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 guidance circuit, which includes a power module, a switching switch, a voltage detection point and a main control module, wherein the positive pole of the power module is connected to the first switching end of the switching switch, the negative pole of the power module is connected to the second switching end of the switching switch, and the fixed end of the switching switch is connected to the main control module via the voltage detection point;

[0007] The main control module is used to determine a first voltage at the voltage detection point, and control a connection state of the switch according to the first voltage.

[0008] In some embodiments, the connection state of the switching switch includes a first connection state and a second connection state; the first connection state indicates that the fixed end of the switching switch is connected to the first switching end, and the second connection state indicates that the fixed end of the switching switch is connected to the second switching end.

[0009] In some embodiments, the control steering circuit also includes a switch tube, a first end of which is respectively connected to the positive pole of the power module and the first switching end of the switching switch, a second end is connected to the main control module, and a third end is grounded.

[0010] In some embodiments, when the switch tube is an NPN transistor, the first end of the switch tube is the collector of the NPN transistor, the second end is the base of the NPN transistor, and the third end is the emitter of the NPN transistor.

[0011] In some embodiments, the control guidance circuit is connected to a charging object, and the main control module is also used to determine a voltage change value between the first voltage and a reference voltage, and compare the voltage change value with a set threshold value. If it is determined that the voltage change value is greater than or equal to the set threshold value, the switching switch is controlled to switch from a first connection state to a second connection state; the reference voltage is the voltage of the voltage detection point when the control guidance circuit is not connected to a charging object and the switching switch is in the first connection state.

[0012] In some embodiments, the main control module is also used to send a pulse width modulation (PWM) signal to the second end of the switch tube to drive the switch tube to be turned on and off when controlling the switching switch to switch from the first connection state to the second connection state.

[0013] In some embodiments, the main control module is also used to determine the second voltage of the voltage detection point when controlling the switching switch to switch from the first connection state to the second connection state, determine whether the second voltage is in the normal threshold range of -12V, and if it is determined to be yes, control the switching switch to switch from the second connection state back to the first connection state.

[0014] In some embodiments, the main control module is also used to determine the third voltage of the voltage detection point when controlling the switching switch to switch from the second connection state back to the first connection state, determine whether the third voltage is within the normal threshold range of 6V, and charge the charging object if it is determined to be yes.

[0015] In some embodiments, the control guidance circuit further includes an alarm circuit, and the alarm circuit is connected to the main control module;

[0016] The main control module is further used to: when it is determined that the second voltage is not within the normal threshold range of -12V, control the alarm circuit to send an alarm signal.

[0017] The utility model also provides a charging pile, which includes one or more control guidance circuits mentioned above.

[0018] The utility model provides a control guidance circuit and a charging pile, wherein the control guidance circuit comprises a power module, a switching switch, a voltage detection point and a main control module, wherein the positive pole of the power module is connected to the first switching end of the switching switch, the negative pole of the power module is connected to the second switching end of the switching switch, and the fixed end of the switching switch is connected to the main control module via the voltage detection point; the main control module is used to determine the first voltage of the voltage detection point and control the connection state of the switching switch according to the first voltage.

[0019] It can be seen that in the utility model, the control steering circuit does not include a push-pull circuit, so the control steering circuit does not have the problem of crossover distortion. In this way, the stability of the circuit can be ensured, making the circuit less susceptible to external interference during operation; in addition, the control steering circuit needs to detect negative pressure to determine that the charging object is an electric vehicle rather than other media. In the utility model, the positive branch and the negative branch of the power module are separated by a switching switch, which can more conveniently perform negative pressure detection and make the circuit implementation simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an application scenario diagram of a control guidance circuit provided by the utility model;

[0021] Figure 2 A schematic diagram of the structure of a control guidance circuit provided by the utility model;

[0022] Figure 3 A schematic diagram of the structure of another control and guidance circuit provided by the utility model;

[0023] Figure 4 The utility model is a schematic diagram of the structure of a charging pile. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] Figure 1 This is an application scenario diagram of a control guidance circuit provided by the utility model, such as Figure 1 As shown, the control guidance circuit 10 provided by the utility model 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.

[0027] Here, the charging pile 11 can be an AC charging pile or a DC charging pile, and the present invention does not limit this.

[0028] It should be noted that the charging object 1 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.

[0029] Below Figure 1 Based on Figure 2 The above process is described exemplarily.

[0030] Figure 2 A schematic diagram of the structure of a control guidance circuit provided by the utility model is shown as follows: Figure 2 As shown, the control guidance circuit 10 includes a power module 101, a voltage detection point 102, a switching switch 103 and a main control module 104, the positive pole of the power module 101 is connected to the first switching end of the switching switch 103, the negative pole of the power module 101 is connected to the second switching end of the switching switch 103, and the fixed end of the switching switch 103 is connected to the main control module 104 via the voltage detection point 102.

[0031] The main control module 104 is used to determine a first voltage at the voltage detection point 102 and control a connection state of the switch 103 according to the first voltage.

[0032] Here, the power module 101 is used to power each module in the control guidance circuit 10, wherein the voltage range of the power module 101 is related to the relevant standards applicable to the control guidance circuit 10. By way of example, assuming that the applicable standard of the control guidance circuit 10 is the national standard GB / T18487.1-2023 for electric vehicle power batteries, the voltage range of the power module 101 is ±12V. At this time, the positive voltage of the power module 101 is +12V, i.e. 12V, and the negative voltage is -12V. This will be used as an example for explanation later.

[0033] Exemplarily, the voltage detection point is also called a control pilot (CP) detection point, which is located between the switch 103 and the main control module 104, and its voltage range is ±12V.

[0034] In the present invention, the connection state of the switching switch includes a first connection state and a second connection state; wherein the first connection state represents that the fixed end of the switching switch is connected to the first switching end, and the second connection state represents that the fixed end of the switching switch is connected to the second switching end.

[0035] Exemplarily, the switching switch may be a relay, or other switching device having two switching ends, which is not limited in the present invention.

[0036] It should be noted that the first connection state is the default connection state of the switch; Figure 3 A schematic diagram of another control and guidance circuit provided by the utility model is shown in FIG. Figure 3 As shown, when the switch 103 is in the first connection state, the positive electrode (+12V) of the power module is connected to the ADC pin (corresponding to the ADC pin) of the main control module via the voltage detection point 102. Figure 3 when the switch 103 is in the second connection state, the negative electrode (-12V) of the power module is connected to the ADC pin of the main control module via the voltage detection point 102.

[0037] In some embodiments, the control steering circuit 10 also includes a switch tube, a first end of the switch tube is respectively connected to the positive pole of the power module 101 and the first switching end of the switch 103, a second end is connected to the main control module, and a third end is grounded.

[0038] In the present invention, the switch tube is used to realize the switching function of the circuit; here, the type of the switch tube is not limited, and it can be an NPN transistor, a PNP transistor, an NMOS transistor or a PMOS transistor, etc.; the NPN transistor is used as an example for explanation below.

[0039] For example, see Figure 3 In the case where the switch tube is an NPN transistor, the first end of the switch tube is the collector of the NPN transistor, the second end is the base of the NPN transistor, and the third end is the emitter of the NPN transistor.

[0040] It can be understood that in the related art, most of the control steering circuits use push-pull circuits to achieve corresponding functions. Since the emitter of the NPN transistor in the push-pull circuit is the output end, there is a tube voltage drop problem. To solve this problem, it is necessary to redesign the power module or add an additional power conversion circuit, which leads to a high complexity of the circuit. However, in the control steering circuit provided by the utility model, a push-pull circuit is not used, and the common collector circuit is changed to a common emitter circuit, which can effectively solve the tube voltage drop problem, that is, there is no need to redesign the power module or add an additional power conversion circuit, and the existing power module can be directly used. In this way, the complexity of the circuit can be effectively reduced.

[0041] Exemplarily, the main control module 104 may include a main control chip, which is also called a microcontroller unit (MCU) chip. Here, the model and packaging form of the MCU chip are not specifically limited.

[0042] In the utility model, the control guidance circuit 10 is connected to the charging object 13 through the fixed end of the switching switch 103; the main control module 104 can determine the first voltage of the voltage detection point 102, and then control the connection state of the switching switch 103 according to the first voltage; here, the first voltage refers to the voltage determined by the main control module 104 for the voltage detection point 102 when the control guidance circuit 10 is connected to the charging object 13 and the switching switch 103 is in the first connection state.

[0043] In some embodiments, the main control module 104 is also used to: determine the voltage change value between the first voltage and the reference voltage, compare the voltage change value with a set threshold, and if it is determined that the voltage change value is greater than or equal to the set threshold, control the switching switch 103 to switch from the first connection state to the second connection state.

[0044] Exemplarily, the reference voltage is the voltage of the voltage detection point 102 when the control steering circuit 10 is not connected to the charging object 13 and the switch 103 is in the first connection state; Figure 3 It can be seen from the circuit shown that the reference voltage is equal to the positive voltage 12V of the power module 101.

[0045] In the utility model, the main control module 104 can obtain the reference voltage of the voltage detection point 102 in advance. In this way, when the main control module 104 determines the first voltage of the voltage detection point 102, it will determine the voltage change value between the first voltage and the reference voltage, and compare the voltage change value with the set threshold to obtain a comparison result; then, the connection state of the switching switch 103 is controlled according to the comparison result.

[0046] Exemplarily, according to the above content, the first voltage is the voltage determined by the main control module 104 when the control guidance circuit 10 is connected to the charging object 13, and the reference voltage is the voltage obtained by the main control module 104 when the control guidance circuit 10 is not connected to the charging object 13. Since the charging object 13 will be divided when connected to the circuit, the first voltage is less than the reference voltage. Here, the difference between the first voltage and the reference voltage can be determined as the voltage change value.

[0047] Here, the value of the set threshold value can be determined according to the relevant standards applicable to the control and guidance circuit 10; for example, assuming that the relevant standards applicable to the control and guidance circuit 10 are GB / T 18487.1-2023, according to the standard, when the control and guidance circuit 10 of the charging pile is not connected to the charging object 13, the voltage at the voltage detection point is 12V, that is, the reference voltage is 12V; when the control and guidance circuit 10 of the charging pile is connected to the charging object 13, the voltage at the voltage detection point will change. Assuming that the main control module 104 determines that the voltage at the voltage detection point is 9V, it means that the connected charging object 13 may be a normal charging object or an abnormal object, which needs to be further determined under negative pressure conditions. Here, the set threshold value can be determined according to the difference between 12V and 9V, that is, the set threshold value is set to about 3V, for example, it can be set to 2.9V, 3V or 3.1V, etc.

[0048] Furthermore, after determining the voltage change value between the first voltage and the reference voltage, the main control module 104 can compare the voltage change value with a set threshold value. When the comparison result is that the voltage change value is greater than or equal to the set threshold value, it indicates that the control guidance circuit 10 is connected to the charging object 13. At this time, the control switching switch is switched from the first connection state to the second connection state to further determine whether the charging object is a normal charging object. On the contrary, when the comparison result is that the voltage change value is less than the set threshold value, it indicates that the control guidance circuit is not connected to the charging object. At this time, the main control module 104 continues to determine the voltage at the voltage detection point until the voltage change value between the determined voltage and the reference voltage is greater than or equal to the set threshold value.

[0049] In some embodiments, the main control module 104 is also used to determine the second voltage of the voltage detection point when the control switch is switched from the first connection state to the second connection state, determine whether the second voltage is in the normal threshold range of -12V, and if it is determined to be yes, control the switching switch to switch from the second connection state back to the first connection state.

[0050] Exemplarily, when the switching switch 103 is in the second connection state, the negative pole of the power module 101 is connected to the charging object 13 via the switching switch 103. At this time, the main control module 104 determines the second voltage of the voltage detection point, and determines whether the second voltage is in the normal threshold range of -12V. If it is determined to be yes, it means that the charging object 13 is a normal charging object. At this time, the switching switch is controlled to switch from the second connection state back to the first connection state to prepare for subsequent charging. Otherwise, it means that the charging object 13 is not a normal charging object.

[0051] It should be noted that the value of the normal threshold interval can be set according to the actual circuit, and the embodiment of the utility model is not limited to this. For example, the normal threshold interval can be ±0.1V or ±0.2V of the corresponding voltage.

[0052] It can be understood that when the switch 103 is in the second connection state, if the charging object 13 is a normal charging object, such as Figure 3 The electric car 105 shown in the figure contains a diode inside, and the diode has unidirectional conductivity, so it will not divide the voltage at the voltage detection point. At this time, the voltage at the voltage detection point is equal to the negative voltage of the power module 101 -12V; therefore, if the main control module 104 determines that the second voltage is in the normal threshold range of -12V, it can be said that the charging object 13 is a normal charging object. On the contrary, if the main control module 104 determines that the second voltage is not in the normal threshold range of -12V, it means that the charging object 13 has divided the voltage at the voltage detection point to a certain extent. At this time, it can be determined that the charging object 13 is an abnormal charging object.

[0053] It can be seen that in the present invention, if it is necessary to determine whether the charging object 13 is a normal charging object in the negative pressure branch, it is only necessary to switch the connection state of the switching switch 103 through the main control module 104, and the circuit implementation is simpler; in addition, by switching the switch 103 to separate the positive branch and the negative branch of the power supply module 101, the interference between the circuits can be reduced, and the type of the charging object 13 can be accurately determined.

[0054] In some embodiments, the control guidance circuit 10 also includes an alarm circuit, which is connected to the main control module 104; the main control module 104 is also used to: when it is determined that the charging object 13 is an abnormal charging object, control the alarm circuit to send an alarm signal.

[0055] In the present invention, when the main control module 104 determines that the charging object 13 is an abnormal charging object, it will send an alarm signal to the alarm circuit for alarm. At this time, the charging operation will not be performed.

[0056] Here, there is no limitation on the sending method of the alarm signal, for example, it can be a light-emitting method or a voice method.

[0057] It can be seen that in the present invention, by setting an alarm circuit in the control guidance circuit 10, it can be ensured that when an abnormal charging object, such as a child, accidentally touches the charging pile, an alarm signal is issued in time to remind the abnormal charging object to stay away from the charging pile.

[0058] In some embodiments, the main control module 104 is further configured to send a PWM signal to the second end of the switch tube to drive the switch tube to be turned on and off when controlling the switch 103 to switch from the first connection state to the second connection state.

[0059] In the present utility model, according to the above content, it can be known that the purpose of the main control module 104 switching the switching switch 103 from the first connection state to the second connection state is to determine whether the charging object 13 is a normal charging object. If it is determined that the charging object 13 is a normal charging object, the switching switch 103 will be controlled to switch from the second connection state back to the first connection state, that is, the default connection state, to enter the subsequent charging preparation.

[0060] Exemplarily, when the main control module 104 controls the switch 103 to switch from the second connection state back to the first connection state, it sends a PWM control signal to the second end of the switch tube 102 to drive the switch tube to be turned on and off.

[0061] Here, the size of the PWM control signal is related to the relevant standard applicable to the control steering circuit 10; for example, assuming that the relevant standard applicable to the control steering circuit 10 is GB / T 18487.1-2023, the PWM control signal can be a 1kHz PWM control signal.

[0062] For example, see Figure 3 In the case where the switch tube is an NPN transistor, the base of the switch tube receives the 1kHz PWM control signal (corresponding to Figure 3 When CP_PWM in the circuit is reached, the PWM control signal is output from the collector. At this time, the voltage at the voltage detection point changes from 9V to 9V PWM. If the electric car 105 detects 9V PWM, the switch S2 is closed, and the resistors R2 and R3 are connected in parallel. The two parallel resistors and the previous resistor R1 divide the voltage. At this time, the voltage at the voltage detection point changes from 9V PWM to 6V PWM.

[0063] In some embodiments, the main control module 104 is also used to determine the third voltage of the voltage detection point when the control switch is switched from the second connection state back to the first connection state, determine whether the third voltage is within the normal threshold range of 6V, and charge the charging object if it is determined to be so.

[0064] Exemplarily, according to the above content, when the main control module 104 controls the switch to switch from the second connection state back to the first connection state, the voltage at the voltage detection point will change from 9V PWM to 6V PWM; at this time, the main control module 104 determines the third voltage of the voltage detection point.

[0065] Further, the main control module 104 determines whether the third voltage of the voltage detection point is in the normal threshold range of 6V. If so, it means that the charging object meets the charging requirements. At this time, the charging object is charged. That is to say, if the main control module 104 determines that the third voltage of the voltage detection point is in the normal threshold range of 6V, for example, 6V, the charging object will be charged; otherwise, it means that the charging object does not meet the charging requirements. At this time, the charging object will not be charged.

[0066] It can be seen that in the present invention, the control steering circuit only includes a switch tube, and does not use a push-pull circuit, thereby ensuring that the control steering circuit does not have the problem of crossover distortion. In this way, the stability of the circuit can be ensured, making the circuit less susceptible to external interference during operation; in addition, the control steering circuit needs to detect negative pressure to determine that the charging object is an electric vehicle rather than other media. In the present invention, the positive branch and the negative branch of the power module are separated by a switching switch, which can more conveniently perform negative pressure detection and make the circuit implementation simpler.

[0067] It should be noted that the main control module 104 may also include a control guide sampling circuit, wherein the input end of the control guide sampling circuit is connected to the voltage detection point, and the output end is connected to the sampling pin of the MCU chip, wherein the control guide sampling circuit is used to convert the voltage of the voltage detection point into a voltage that meets the voltage input range of the MCU chip after obtaining it, and input the converted voltage into the MCU chip, the MCU chip samples the converted voltage and converts the processed voltage into the previous voltage according to the corresponding conversion relationship, and then performs the above-mentioned processing on the voltage, or directly performs the above-mentioned processing on the converted voltage according to the corresponding conversion relationship. The processing process is similar to the above-mentioned embodiment, and will not be repeated here to avoid repeated description.

[0068] The utility model also provides a charging pile 11, such as Figure 4 As shown, the charging pile 11 includes a control guidance circuit 10 of any of the above solutions.

[0069] As in the above-mentioned embodiment, the control steering circuit includes a power module, a switching switch, a voltage detection point and a main control module, the positive electrode of the power module is connected to the first switching end of the switching switch, the negative electrode of the power module is connected to the second switching end of the switching switch, and the fixed end of the switching switch is connected to the main control module via the voltage detection point;

[0070] The main control module is used to determine a first voltage at a voltage detection point and control a connection state of the switch according to the first voltage.

[0071] As in the above-mentioned embodiment, the connection state of the switch includes a first connection state and a second connection state; the first connection state indicates that the fixed end of the switch is connected to the first switching end, and the second connection state indicates that the fixed end of the switch is connected to the second switching end.

[0072] As in the above-mentioned embodiment, the control steering circuit also includes a switch tube, a first end of the switch tube is respectively connected to the positive pole of the power module and the first switching end of the switch, a second end is connected to the main control module, and a third end is grounded.

[0073] As in the above embodiment, when the switch tube is an NPN transistor, the first end of the switch tube is the collector of the NPN transistor, the second end is the base of the NPN transistor, and the third end is the emitter of the NPN transistor.

[0074] As in the aforementioned embodiment, the control guidance circuit is connected to the charging object by a main control module, and the main control module is also used to determine the voltage change value between the first voltage and the reference voltage, and compare the voltage change value with the set threshold value. If it is determined that the voltage change value is greater than or equal to the set threshold value, the control switching switch is switched from the first connection state to the second connection state; the reference voltage is the voltage of the voltage detection point when the control guidance circuit is not connected to the charging object and the switching switch is in the first connection state.

[0075] As in the above-mentioned embodiment, the main control module is also used to send a pulse width modulation (PWM) signal to the second end of the switch tube to drive the switch tube to be turned on and off when controlling the switch to switch from the first connection state to the second connection state.

[0076] As in the aforementioned embodiment, the main control module is also used to determine the second voltage of the voltage detection point when controlling the switching switch to switch from the first connection state to the second connection state, determine whether the second voltage is in the normal threshold range of -12V, and if it is determined to be yes, control the switching switch to switch from the second connection state back to the first connection state.

[0077] As in the aforementioned embodiment, the main control module is also used to determine the third voltage of the voltage detection point when the control switch is switched from the second connection state back to the first connection state, determine whether the third voltage is within the normal threshold range of 6V, and charge the charging object if it is determined to be so.

[0078] As in the aforementioned embodiment, the control guidance circuit further includes an alarm circuit, and the alarm circuit is connected to the main control module;

[0079] The main control module is further used to: when it is determined that the second voltage is not within the normal threshold interval of -12V, control the alarm circuit to send an alarm signal.

[0080] It should be noted that the relevant circuit structure diagrams provided in the present utility model are not limited to the above Figure 3 The present invention is not limited to the described circuit structure.

[0081] 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.

[0082] 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.

[0083] 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 steering circuit, characterized in that: The control and guidance circuit includes a power module, a switching switch, a voltage detection point and a main control module, the positive pole of the power module is connected to the first switching end of the switching switch, the negative pole of the power module is connected to the second switching end of the switching switch, and the fixed end of the switching switch is connected to the main control module via the voltage detection point; The main control module is used to determine a first voltage at the voltage detection point, and control a connection state of the switch according to the first voltage.

2. The circuit according to claim 1, characterized in that The connection state of the switching switch includes a first connection state and a second connection state; the first connection state indicates that the fixed end of the switching switch is connected to the first switching end, and the second connection state indicates that the fixed end of the switching switch is connected to the second switching end.

3. The circuit according to claim 2, characterized in that The control steering circuit also includes a switch tube, a first end of which is respectively connected to the positive electrode of the power module and the first switching end of the switch, a second end is connected to the main control module, and a third end is grounded.

4. The circuit according to claim 3, characterized in that In the case where the switch tube is an NPN transistor, the first end of the switch tube is the collector of the NPN transistor, the second end is the base of the NPN transistor, and the third end is the emitter of the NPN transistor.

5. The circuit according to claim 4, characterized in that The control guidance circuit is connected to a charging object, and the main control module is further used to determine a voltage change value between the first voltage and a reference voltage, compare the voltage change value with a set threshold, and if it is determined that the voltage change value is greater than or equal to the set threshold, control the switching switch to switch from a first connection state to a second connection state; the reference voltage is the voltage of the voltage detection point when the control guidance circuit is not connected to a charging object and the switching switch is in the first connection state.

6. The circuit according to claim 5, characterized in that The main control module is also used to send a pulse width modulation (PWM) signal to the second end of the switch tube to drive the switch tube to be turned on and off when controlling the switch to switch from the first connection state to the second connection state.

7. The circuit according to claim 6, characterized in that The main control module is also used to determine the second voltage of the voltage detection point when controlling the switching switch to switch from the first connection state to the second connection state, determine whether the second voltage is in the normal threshold range of -12V, and if it is determined to be yes, control the switching switch to switch from the second connection state back to the first connection state.

8. The circuit according to claim 7, characterized in that The main control module is also used to determine the third voltage of the voltage detection point when controlling the switching switch to switch from the second connection state back to the first connection state, determine whether the third voltage is within the normal threshold range of 6V, and charge the charging object if it is determined to be yes.

9. The circuit according to claim 7 or 8, characterized in that The control guidance circuit also includes an alarm circuit, and the alarm circuit is connected to the main control module; The main control module is further used to: when it is determined that the second voltage is not within a normal threshold range of -12V, control the alarm circuit to send an alarm signal.

10. A charging pile, characterized in that: The charging pile comprises the control steering circuit according to any one of claims 1-9.

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