A charging pile and a voltage collection method of a control guide circuit thereof

Abstract

The application discloses a charging pile and a voltage collection method of a control guide circuit of the charging pile. The method comprises the following steps: a control module controls a signal output module to output a detection signal to a charged device and starts a waveform timer; the detection signal is converted into a control guide signal according to the connection state of the charging pile and the charged device; the waveform timer monitors the control guide signal, and when the control guide signal is flipped from a first level to a second level, the waveform timer triggers an overflow interrupt signal; the control module receives the overflow interrupt signal of the waveform timer and controls an acquisition timer to start; the acquisition timer triggers an overflow interrupt signal after timing ends, and the control module receives the overflow interrupt signal of the acquisition timer and collects the control guide signal; the control module generates a voltage level signal according to the control guide signal, and judges the connection state between the charging pile and the charged device according to the voltage level signal. The application improves the collection effect of the voltage.

Description

Technical Field

[0001] This invention relates to the field of charging pile technology, and in particular to a voltage acquisition method for a charging pile and its control and guidance circuit. Background Technology

[0002] The charging pile control and guidance circuit controls the charging pile to output a detection signal to the device being charged, and determines the connection status between the charging pile and the device being charged based on the voltage level of the control and guidance signal generated from the detection signal. Therefore, the accurate acquisition of the control and guidance signal determines the determination of the connection status between the charging pile and the device being charged.

[0003] However, existing technologies for voltage acquisition have high power consumption and low accuracy, resulting in poor voltage acquisition performance. Summary of the Invention

[0004] This invention provides a voltage acquisition method for a charging pile and its control and guidance circuit to solve the problem of poor voltage acquisition effect.

[0005] According to one aspect of the present invention, a voltage acquisition method for a charging pile control and guidance circuit is provided, wherein the control and guidance circuit includes a control module, a signal output module, a waveform timer, and an acquisition timer; the signal output module, the waveform timer, and the acquisition timer are all connected to the control module;

[0006] The voltage acquisition method of the charging pile control and guidance circuit includes:

[0007] The control module controls the signal output module to output a detection signal to the device being charged and controls the waveform timer to start; the detection signal is converted into a control guidance signal according to the connection status between the charging pile and the device being charged, and the detection signal and the control guidance signal have the same frequency.

[0008] The waveform timer monitors the control guidance signal. When the control guidance signal flips from a first level to a second level, the waveform timer triggers an overflow interrupt signal. The control module receives the overflow interrupt signal from the waveform timer and controls the acquisition timer to start.

[0009] When the acquisition timer finishes counting down, an overflow interrupt signal is triggered. The control module receives the overflow interrupt signal from the acquisition timer and acquires the control guidance signal.

[0010] The control module generates a voltage level signal based on the control guidance signal, and determines the connection status between the charging pile and the device being charged based on the voltage level signal.

[0011] Optionally, after the acquisition timer finishes counting down, an overflow interrupt signal is triggered. The control module receives the overflow interrupt signal from the acquisition timer and acquires the control guidance signal, including:

[0012] An overflow interrupt signal is triggered when the acquisition timer reaches the first time.

[0013] The control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal.

[0014] Optionally, the first time is within 60%-70% of the duration of the control guidance signal at the second level.

[0015] Optionally, the control module generates a voltage level signal based on the control guidance signal, and determines the connection status between the charging pile and the device being charged based on the voltage level signal, including:

[0016] The control module generates a digital electrical signal based on the control guidance signal and converts it into the voltage level signal;

[0017] The control module is used to detect the connection status between the charging pile and the device being charged based on the relationship between the voltage level signal and the first voltage, the second voltage, and the third voltage.

[0018] Optionally, the control module is used to detect the connection status between the charging pile and the device being charged based on the relationship between the voltage level signal and the first voltage, the second voltage, and the third voltage, including:

[0019] When the voltage level signal is the first voltage, there is no connection between the charging pile and the device being charged;

[0020] When the voltage level signal is the second voltage, the charging pile is connected to the device being charged but is not charging;

[0021] When the voltage level signal is the third voltage, the charging pile is connected to the device being charged and is charging; the first voltage is greater than the second voltage; the second voltage is greater than the third voltage.

[0022] Optionally, the first voltage is the same as the voltage of the detection signal, the second voltage is 3 / 4 of the first voltage, and the third voltage is 1 / 2 of the first voltage.

[0023] Optionally, after the acquisition timer finishes counting down and triggers an overflow interrupt signal, the control module, after receiving the overflow interrupt signal from the acquisition timer and acquiring the control guidance signal, further includes:

[0024] The acquisition timer triggers multiple overflow interrupts, and the control module acquires the control guidance signal according to the time of each overflow interrupt.

[0025] Optionally, the acquisition timer triggers multiple overflow interrupts, and the control module acquires the control guidance signal according to the time of each overflow interrupt, then includes:

[0026] The control module generates digital electrical signals according to each of the control guidance signals and converts them into multiple voltage level signals;

[0027] The control module selects the median value of each voltage level signal as the target voltage level signal, and detects the connection status between the charging pile and the device being charged based on the target voltage level signal.

[0028] According to another aspect of the present invention, a charging pile is provided, employing a voltage acquisition method for the charging pile control and guidance circuit as provided in any embodiment of the present invention.

[0029] The technical solution provided by this invention, through the setting of a waveform timer and a data acquisition timer, wherein the waveform timer is used to monitor the control guidance signal, so that when the control guidance signal flips to the second level, the control module can promptly control the start of the data acquisition timer, and perform signal acquisition after the data acquisition timer triggers an overflow interrupt signal, effectively avoiding unstable control guidance signals, helping to prevent the influence of interference signals on signal acquisition, achieving accurate acquisition of the control guidance signal, and making the voltage level signal have high accuracy. This invention does not require setting instruction delays through the control module, nor does it require multiple repeated acquisitions within one signal cycle, thus not consuming the system resources of the control module, ensuring the efficient operation of the control module, and exhibiting low power consumption and good acquisition effect.

[0030] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a flowchart of a voltage acquisition method for a charging pile control and guidance circuit according to an embodiment of the present invention;

[0033] Figure 2 This is a flowchart of a specific implementation method of S130 provided by an embodiment of the present invention;

[0034] Figure 3 This is a flowchart of a specific implementation method of S140 provided by an embodiment of the present invention;

[0035] Figure 4 This is a flowchart of a specific implementation method of S142 provided by an embodiment of the present invention;

[0036] Figure 5 This is a flowchart of another voltage acquisition method for a charging pile control and guidance circuit according to an embodiment of the present invention. Detailed Implementation

[0037] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] This invention provides a voltage acquisition method for a charging pile control and guidance circuit. The control and guidance circuit includes a control module, a signal output module, a waveform timer, and an acquisition timer; the signal output module, waveform timer, and acquisition timer are all connected to the control module. The voltage acquisition method for the charging pile control and guidance circuit can be executed by the control module. Figure 1 This is a flowchart illustrating a voltage acquisition method for a charging pile control and guidance circuit according to an embodiment of the present invention. (Reference) Figure 1 The voltage acquisition methods for the charging pile control and guidance circuit include:

[0040] S110, the control module outputs a detection signal to the device being charged and controls the waveform timer to start; the detection signal is converted into a control guidance signal according to the connection status between the charging pile and the device being charged, and the detection signal and the control guidance signal have the same frequency.

[0041] The signal output module can be used to output a detection signal, which can be, for example, a voltage signal. Since the device being charged contains components such as resistors and capacitors, when the charging pile is connected to the device, the detection signal can be divided and converted into control guidance signals of different magnitudes depending on the different connection states between the charging pile and the device. Therefore, the detection signal and the control guidance signal are signals of different magnitudes but the same frequency.

[0042] S120: The waveform timer monitors and controls the guidance signal. When the guidance signal changes from the first level to the second level, the waveform timer triggers an overflow interrupt signal. The control module receives the overflow interrupt signal from the waveform timer and controls the acquisition timer to start.

[0043] Specifically, a waveform timer starts simultaneously with the output of a detection signal from the signal output module. The waveform timer monitors different levels of the control guide signal. For example, the first level can be low, and the second level can be high. When the control guide signal transitions from low to high, the waveform timer triggers an overflow interrupt signal. If the control guide signal is high when the waveform timer starts, the waveform timer directly triggers an overflow interrupt signal.

[0044] The moment the waveform timer triggers the overflow interrupt signal, which is also the moment the control guide signal is at the second level, the control guide signal may not be in a stable state. If the control guide signal is directly acquired at this time, the acquisition result may be inaccurate. Therefore, the control module starts the acquisition timer and acquires the control guide signal only after the acquisition timer has finished counting.

[0045] S130. When the acquisition timer finishes counting down, an overflow interrupt signal is triggered. The control module receives the overflow interrupt signal from the acquisition timer and acquires the control and guidance signal.

[0046] The timing of the acquisition timer can be adaptively set according to the duration of the second level. When the second level transitions from the first level to the second level, or is about to transition back to the first level, the state of the control guide signal is unstable. Therefore, these two moments need to be avoided when acquiring the control guide signal. For example, the timing of the acquisition timer can be 60% of the duration of the second level. At this time, the control guide signal is in a stable state. This setting effectively reduces interference signals during signal acquisition, ensuring the accuracy of the acquired control guide signal data at that moment.

[0047] S140 The control module generates a voltage level signal based on the control guidance signal, and determines the connection status between the charging pile and the device being charged based on the voltage level signal.

[0048] When the control module reads the voltage value, it can convert the control guidance signal into a voltage level signal, which can be used to represent the actual voltage value of the control guidance signal.

[0049] When the charging station and the device being charged are not connected, the detection signal is not divided, and the voltage level signal has the same voltage magnitude as the detection signal. This voltage level signal can be used to indicate that the charging station and the device being charged are not connected.

[0050] When the charging station and the device being charged are connected, the detection signal is divided, and the voltage level signal is lower than the voltage of the detection signal. This voltage level signal can be used to indicate that the charging station and the device being charged are connected.

[0051] When the charging station is connected to the device being charged but not charging, the voltage division value of the detection signal is small, for example, the voltage level signal is 75% of the detection signal size. At this time, the voltage level signal can be used to indicate that the charging station and the device being charged are connected but not charging.

[0052] When the charging station is connected to the device being charged and charging is in progress, the voltage division value of the detection signal is relatively large. For example, the voltage level signal is 50% of the detection signal size. At this time, the voltage level signal can be used to indicate that the charging station and the device being charged are connected and charging is in progress.

[0053] The technical solution provided by this invention, through the setting of a waveform timer and a data acquisition timer, wherein the waveform timer is used to monitor the control guidance signal, so that when the control guidance signal flips to the second level, the control module can promptly control the start of the data acquisition timer, and perform signal acquisition after the data acquisition timer triggers an overflow interrupt signal, effectively avoiding unstable control guidance signals, helping to prevent the influence of interference signals on signal acquisition, achieving accurate acquisition of the control guidance signal, and making the voltage level signal have high accuracy. This invention does not require setting instruction delays through the control module, nor does it require multiple repeated acquisitions within one signal cycle, thus not consuming the system resources of the control module, ensuring the efficient operation of the control module, and exhibiting low power consumption and good acquisition effect.

[0054] Figure 2 This is a flowchart illustrating a specific implementation method of S130 provided in an embodiment of the present invention. (See reference...) Figure 2 Based on the above embodiments, optionally, in S130, after the acquisition timer finishes counting down, an overflow interrupt signal is triggered, and the control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal, including:

[0055] S131. When the acquisition timer reaches the first time, an overflow interrupt signal is triggered.

[0056] S132. The control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal.

[0057] When the waveform timer triggers an overflow interrupt signal, that is, when the control guide signal flips from the first level to the second level, the control module controls the acquisition timer to start timing, and triggers an overflow interrupt signal after the first time. The control module then acquires the control guide signal that is at the second level.

[0058] During signal acquisition, by delaying the acquisition timer at the first moment, the control module can avoid acquiring the control guide signal at the moment when the control guide signal just flips from the first level to the second level, and trigger an overflow interrupt signal before the second level flips back to the first level. This setting method is equivalent to reducing the unstable signal during signal acquisition, so that the control guide signal acquired by the control module is a stable and accurate value.

[0059] Based on the above embodiments, optionally, the first time is within 60%-70% of the duration of the control guidance signal at the second level.

[0060] When the first level flips to the second level, the stability of the second level gradually changes from unstable to stable, and then becomes unstable again just before the second level flips back to the first level. Therefore, the second level is in the most stable period of the signal within 60%-70% of the duration of the second level, and the acquisition of the control and guidance signal is more accurate within this range.

[0061] For example, when the frequency of the control guide signal is 1K and the duty cycle is 10%, if the first level is low and the second level is high, the duration of the second level in one cycle is 100 microseconds. At this time, the first time can be selected from a value in the range of 60-70 microseconds, for example, 60 microseconds.

[0062] Figure 3 This is a flowchart illustrating a specific implementation method of S140 provided in an embodiment of the present invention. (See reference...) Figure 3 Based on the above embodiments, optionally, S140, the control module generates a voltage level signal according to the control guidance signal, and determines the connection status between the charging pile and the charged device according to the voltage level signal, including:

[0063] S141. The control module generates digital electrical signals based on the control guidance signals and converts them into voltage level signals.

[0064] The control guidance signal can be an analog signal, but the control module needs to convert it into a digital electrical signal before it can continue to read and process the signal. Finally, the control module generates a voltage level signal based on the digital electrical signal, which is the actual voltage value of the control guidance signal.

[0065] S142. The control module is used to detect the connection status between the charging pile and the device being charged based on the relationship between the voltage level signal and the first voltage, the second voltage and the third voltage.

[0066] When the charging station and the device being charged are not connected, the detection signal is not divided, and the voltage level signal has the same voltage magnitude as the detection signal. The voltage level signal at this time can be the first voltage, which indicates that the charging station and the device being charged are not connected.

[0067] When the charging station and the device being charged are connected, the detection signal is divided into two voltage levels. The voltage level signal can be either a second voltage or a third voltage, both of which are lower than the magnitude of the detection signal. These second and third voltages can be used to indicate that the charging station and the device being charged are connected.

[0068] When the charging pile is connected to the device being charged but not charging, the voltage division value of the detection signal is small, and the voltage level signal can be a second voltage, which is used to indicate that the charging pile and the device being charged are connected but not charging.

[0069] When the charging pile is connected to the device being charged and charging is in progress, the voltage division value of the detection signal is relatively large, and the voltage level signal can be a third voltage. The third voltage can be used to indicate that the charging pile and the device being charged are connected and charging is in progress.

[0070] This invention achieves the determination of the connection relationship between the charging pile and the device being charged by comparing the voltage level signal with a first voltage, a second voltage, and a third voltage. The control guidance signal collected by this invention is accurate, therefore, the determination of the connection relationship between the charging pile and the device being charged also has high accuracy.

[0071] Figure 4 This is a flowchart illustrating a specific implementation method of S142 provided in an embodiment of the present invention. (See reference...) Figure 4 Based on the above embodiments, optionally, in step S142, the control module detects the connection status between the charging pile and the device being charged based on the relationship between the voltage level signal and the first voltage, the second voltage, and the third voltage, including:

[0072] S1421. When the voltage level signal is the first voltage, there is no connection between the charging pile and the device being charged.

[0073] When the charging station and the device being charged are not connected, the voltage level signal at this time is the actual magnitude of the detection signal voltage. This voltage level signal can be a first voltage, which is the same as the detection signal voltage, indicating that the charging station and the device being charged are not connected. For example, the first voltage can be 12V.

[0074] S1422. When the voltage level signal is the second voltage, the charging pile is connected to the device being charged but is not charging.

[0075] When the charging pile and the device being charged are connected, the detection signal is divided. When the charging pile and the device being charged are not being charged, the voltage division value of the detection signal is smaller, and the voltage level signal can be a second voltage. The second voltage is used to indicate that the charging pile and the device being charged are connected but not being charged.

[0076] Optionally, the second voltage is 3 / 4 of the first voltage, and the second voltage can be 9V.

[0077] S1423. When the voltage level signal is the third voltage, the charging pile is connected to the device being charged and is charging.

[0078] When the charging pile is connected to the device being charged and charging is in progress, the voltage division value of the detection signal is relatively large, and the voltage level signal can be a third voltage. The third voltage can be used to indicate that the charging pile and the device being charged are connected and charging is in progress. Therefore, the first voltage is greater than the second voltage, and the second voltage is greater than the third voltage.

[0079] Optionally, the third voltage is half of the first voltage, and the third voltage can be 6V.

[0080] Figure 5 This is a flowchart illustrating another voltage acquisition method for a charging pile control and guidance circuit provided in an embodiment of the present invention. (See reference) Figure 5 Based on the above embodiments, optionally, after S130, when an overflow interrupt signal is triggered after the acquisition timer finishes counting down, and the control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal, the following additional steps are included:

[0081] S150: The acquisition timer triggers multiple overflow interrupts, and the control module acquires control guidance signals according to the time of each overflow interrupt.

[0082] The acquisition timer counts once in each cycle of the control guidance signal. Therefore, the control module can acquire the second electrical average of the control guidance signal in different cycles.

[0083] Specifically, when the control guide signal changes from the first level to the second level, the waveform timer triggers an overflow interrupt signal, the acquisition timer starts, and the waveform timer restarts a new round of timing. When the acquisition timer triggers an overflow interrupt, the control module acquires the control guide signal within that cycle.

[0084] When the control guide signal changes from the first level to the second level again, the waveform timer triggers the overflow interrupt signal again, the acquisition timer restarts, and the waveform timer begins a new round of timing. When the acquisition timer triggers an overflow interrupt, the control module acquires the control guide signal within that cycle.

[0085] For example, when the acquisition timer triggers 20 overflow interrupts, the control module acquires 20 control boot signals. With this configuration, only 20 samples are needed to obtain data for 20 control boot signals.

[0086] However, to ensure data accuracy, existing technologies require multiple samplings within a single cycle, such as 20 times, followed by data filtering and calculation to obtain a single control guidance signal. To obtain data for 20 control guidance signals, 4000 samplings are necessary. Therefore, existing technologies place a heavy workload on the control module, resulting in high energy consumption, low sampling efficiency, and poor sampling performance.

[0087] Continue to refer to Figure 5 Based on the above embodiments, optionally, after S150, where the acquisition timer triggers multiple overflow interrupts and the control module acquires the control guidance signal according to the time of each overflow interrupt, the following steps are included:

[0088] S160: The control module generates digital electrical signals based on various control guidance signals and converts them into signals of multiple voltage levels.

[0089] When the control module acquires multiple control guidance signals, it can generate digital electrical signals from each control guidance signal and convert them into voltage level signals in sequence.

[0090] S170 The control module selects the median value of each voltage level signal as the target voltage level signal, and detects the connection status between the charging pile and the device being charged based on the target voltage level signal.

[0091] To further improve the accuracy of the voltage level signals, the median value of each voltage level signal can be used as the target voltage level signal, and the connection status can be determined based on the target voltage level signal. This method ensures that the voltage level signal used as the target voltage level signal is the most accurate voltage value, eliminating abnormal values ​​caused by interference and improving the sampling accuracy of the control module.

[0092] This invention also provides a charging pile. The voltage acquisition method for the charging pile control and guidance circuit provided in any embodiment of this invention has the corresponding beneficial effects, which will not be elaborated further.

[0093] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0094] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A voltage acquisition method for a charging pile control and guidance circuit, characterized in that, The control and guidance circuit includes a control module, a signal output module, a waveform timer, and a data acquisition timer; the signal output module, the waveform timer, and the data acquisition timer are all connected to the control module. The voltage acquisition method of the charging pile control and guidance circuit includes: The control module controls the signal output module to output a detection signal to the device being charged and controls the waveform timer to start; the detection signal is converted into a control guidance signal according to the connection status between the charging pile and the device being charged, and the detection signal and the control guidance signal have the same frequency. The waveform timer monitors the control guidance signal. When the control guidance signal flips from a first level to a second level, the waveform timer triggers an overflow interrupt signal. The control module receives the overflow interrupt signal from the waveform timer and controls the acquisition timer to start. When the acquisition timer finishes counting down, an overflow interrupt signal is triggered. The control module receives the overflow interrupt signal from the acquisition timer and acquires the control guidance signal. The control module generates a voltage level signal based on the control guidance signal, and determines the connection status between the charging pile and the device being charged based on the voltage level signal. When the acquisition timer finishes counting down, an overflow interrupt signal is triggered. The control module receives the overflow interrupt signal from the acquisition timer and acquires the control guidance signal, including: An overflow interrupt signal is triggered when the acquisition timer reaches the first time. The control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal; The control module generates a voltage level signal based on the control guidance signal, and determines the connection status between the charging pile and the device being charged based on the voltage level signal, including: The control module generates a digital electrical signal based on the control guidance signal and converts it into the voltage level signal; The control module is used to detect the connection status between the charging pile and the device being charged based on the relationship between the voltage level signal and the first voltage, the second voltage, and the third voltage. The control module is used to detect the connection status between the charging pile and the device being charged based on the relationship between the voltage level signal and the first voltage, the second voltage, and the third voltage, including: When the voltage level signal is the first voltage, there is no connection between the charging pile and the device being charged; When the voltage level signal is the second voltage, the charging pile is connected to the device being charged but is not charging; When the voltage level signal is the third voltage, the charging pile is connected to the device being charged and is charging; the first voltage is greater than the second voltage; the second voltage is greater than the third voltage.

2. The voltage acquisition method for the charging pile control and guidance circuit according to claim 1, characterized in that, The first time is within 60%-70% of the duration of the control guidance signal at the second level.

3. The voltage acquisition method for the charging pile control and guidance circuit according to claim 1, characterized in that, The first voltage is the same as the voltage of the detection signal, the second voltage is 3 / 4 of the first voltage, and the third voltage is 1 / 2 of the first voltage.

4. The voltage acquisition method for the charging pile control and guidance circuit according to claim 1, characterized in that, After the acquisition timer finishes counting down and triggers an overflow interrupt signal, the control module receives the overflow interrupt signal from the acquisition timer and acquires the control guidance signal, and then further includes: The acquisition timer triggers multiple overflow interrupts, and the control module acquires the control guidance signal according to the time of each overflow interrupt.

5. The voltage acquisition method for the charging pile control and guidance circuit according to claim 4, characterized in that, The acquisition timer triggers multiple overflow interrupts, and the control module acquires the control guidance signal according to the time of each overflow interrupt, followed by: The control module generates digital electrical signals according to each of the control guidance signals and converts them into multiple voltage level signals; The control module selects the median value of each voltage level signal as the target voltage level signal, and detects the connection status between the charging pile and the device being charged based on the target voltage level signal.

6. A charging pile, characterized in that, The voltage acquisition method of the charging pile control and guidance circuit as described in any one of claims 1-5 is adopted.

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