Charging pile and voltage acquisition method of control guide circuit of charging pile

Abstract

The invention discloses a charging pile and a voltage acquisition 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 charged equipment and controls a waveform timer to start; the detection signal is converted into a control guide signal according to the connection state of the charging pile and the charged equipment; the waveform timer monitors the control guide signal, and when the control guide signal is overturned from the first level to the second level, the waveform timer triggers the overflow interrupt signal; the control module receives an overflow interrupt signal of the waveform timer and controls the acquisition timer to start; an overflow interrupt signal is triggered after timing of the acquisition timer is finished, and the control module receives the overflow interrupt signal of the acquisition timer and acquires a control guide signal; and the control module generates a voltage grade signal according to the control guide signal, and judges the connection state between the charging pile and the charged equipment according to the voltage grade signal. According to the embodiment of the invention, the voltage acquisition effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of charging piles, and in particular to a charging pile and a voltage acquisition method of a control and guidance circuit thereof. Background Art

[0002] The charging pile's control and guidance circuitry controls the charging pile to output a detection signal to the device being charged. The voltage level of the control and guidance signal generated from this detection signal is used to determine the connection status between the charging pile and the device being charged. Therefore, accurate acquisition of the control and guidance signal determines the connection status between the charging pile and the device being charged.

[0003] However, the existing technology has high power consumption and low accuracy in voltage collection, and therefore, the existing technology has poor voltage collection effect. Summary of the Invention

[0004] The present invention provides a voltage acquisition method for a charging pile and a control and guidance circuit thereof, so as to solve the problem of poor voltage acquisition effect.

[0005] According to one aspect of the present invention, a method for collecting voltage of a charging pile control and guidance circuit is provided. 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 guide circuit includes:

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

[0008] The waveform timer monitors the control pilot signal, and when the control pilot signal flips from the first level to the second level, the waveform timer triggers an overflow interrupt signal; the control module receives the overflow interrupt signal of the waveform timer and controls the acquisition timer to start;

[0009] The collection timer triggers an overflow interrupt signal after timing ends, and the control module receives the overflow interrupt signal of the collection timer and collects the control guidance signal;

[0010] 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.

[0011] Optionally, the overflow interrupt signal is triggered after the acquisition timer expires, and the control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal, including:

[0012] When the acquisition timer reaches the first time, an overflow interrupt signal is triggered;

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

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

[0015] Optionally, 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:

[0016] The control module generates a digital electrical signal according to the control guide signal and converts the digital electrical signal into the voltage level signal;

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

[0018] Optionally, the control module is configured to detect the connection status between the charging pile and the charged device according to 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, the charging pile and the charged device are not connected;

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

[0021] When the voltage level signal is the third voltage, the charging pile and the charged device are connected and charging is in progress; the first voltage is greater than the second voltage; and 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 expires, an overflow interrupt signal is triggered, and after the control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal, the method further includes:

[0024] The acquisition timer triggers multiple overflow interrupts, and the control module respectively 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, and then includes:

[0026] The control module generates a digital electrical signal according to each of the control guide signals and converts the digital electrical signal into a plurality of voltage level signals;

[0027] The control module selects the middle value of each of the voltage level signals as the target voltage level signal, and detects the connection status between the charging pile and the charged device according to the target voltage level signal.

[0028] According to another aspect of the present invention, a charging pile is provided, which adopts the voltage acquisition method of the charging pile control guidance circuit provided by any embodiment of the present invention.

[0029] The technical solution provided by the embodiment of the present invention sets a waveform timer and an acquisition timer, wherein the waveform timer is used to monitor the control pilot signal, so that when the control pilot signal flips to the second level, the control module can promptly control the acquisition timer to start, and perform signal acquisition after the acquisition timer triggers the overflow interrupt signal. This effectively avoids unstable control pilot signals, helps prevent the influence of interference signals on signal acquisition, and achieves accurate acquisition of control pilot signals, so that the voltage level signal has high accuracy. The present invention does not require the control module to set an instruction delay, nor does it require multiple repeated acquisitions within a signal cycle. It does not occupy the system resources of the control module, ensures the efficient operation of the control module, and has low power consumption and good acquisition effect.

[0030] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 This is a flow chart of a voltage acquisition method for a charging pile control guide circuit provided by an embodiment of the present invention;

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

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

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

[0036] Figure 5 This is a flowchart of another method for collecting voltage of a charging pile control guide circuit provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0039] An embodiment of the present invention provides a method for collecting voltage from a charging pile control and guidance circuit. The control and guidance circuit includes a control module, a signal output module, a waveform timer, and a collection timer; the signal output module, waveform timer, and collection timer are all connected to the control module. The method can be executed by the control module. Figure 1 This is a flow chart of a method for collecting voltage of a charging pile control guide circuit provided by an embodiment of the present invention. Figure 1 , the voltage acquisition method of the charging pile control guide circuit includes:

[0040] S110. The control module controls the signal output module to output a detection signal to the charged device 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 charged device, 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. Because the charged device contains components such as resistors and capacitors, when the charging pile is connected to the charged device, the detection signal can be divided and converted into control and guidance signals of varying magnitudes depending on the connection status between the charging pile and the charged device. Therefore, the detection signal and the control and guidance signal are signals of different magnitudes but the same frequency.

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

[0043] When the signal output module outputs the detection signal, the waveform timer is activated. The waveform timer can be used to monitor different levels of the control pilot signal. For example, the first level can be a low level, and the second level can be a high level. When the control pilot signal transitions from a low level to a high level, the waveform timer triggers an overflow interrupt signal. If the control pilot signal is directly at a high level when the waveform timer is activated, the waveform timer directly triggers the overflow interrupt signal.

[0044] At the moment the waveform timer triggers the overflow interrupt signal, which is also the moment the control pilot signal reaches the second level, the control pilot signal may not be stable at this moment. Directly collecting the control pilot signal may result in inaccurate results. Therefore, the control module starts the collection timer and collects the control pilot signal after the collection timer expires.

[0045] S130 , after the acquisition timer has finished timing, an overflow interrupt signal is triggered, and the control module receives the overflow interrupt signal of the acquisition timer and acquires a control guide signal.

[0046] The acquisition timer can be adaptively set based on the duration of the second level. The control and guidance signal is unstable at the moment the second level flips from the first level to the second level, or when the second level is about to flip back to the first level. Therefore, it is necessary to avoid these moments when acquiring the control and guidance signal. For example, the acquisition timer can be set to 60% of the duration of the second level. At this point, the control and guidance signal is stable. This setting reduces interference during signal acquisition and ensures the accuracy of the acquired control and guidance signal data at these moments.

[0047] 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.

[0048] When the control module reads the voltage value, the control pilot signal may be converted into a voltage level signal, and the voltage level signal may be used to represent the actual voltage value of the control pilot signal.

[0049] When the charging pile and the charged device are not connected, the detection signal is not divided, and the voltage level signal is the same as the voltage of the detection signal. The voltage level signal at this time can be used to indicate that the charging pile and the charged device are not connected.

[0050] When the charging pile and the charged device are connected, the detection signal is divided, and the voltage level signal is smaller than the voltage of the detection signal. The voltage level signal at this time can be used to indicate that the charging pile and the charged device are connected.

[0051] When the charging pile is connected to the charged device and no charging is being performed, the voltage divided value of the detection signal is small. For example, the voltage level signal is 75% of the size of the detection signal. At this time, the voltage level signal can be used to indicate that the charging pile and the charged device are connected and no charging is being performed.

[0052] When the charging pile is connected to the charged device and charging is in progress, the voltage divided value of the detection signal is larger. For example, the voltage level signal is 50% of the size of the detection signal. The voltage level signal at this time can be used to indicate that the charging pile and the charged device are connected and charging is in progress.

[0053] The technical solution provided by the embodiment of the present invention sets a waveform timer and an acquisition timer, wherein the waveform timer is used to monitor the control pilot signal, so that when the control pilot signal flips to the second level, the control module can promptly control the acquisition timer to start, and perform signal acquisition after the acquisition timer triggers the overflow interrupt signal. This effectively avoids unstable control pilot signals, helps prevent the influence of interference signals on signal acquisition, and achieves accurate acquisition of control pilot signals, so that the voltage level signal has high accuracy. The present invention does not require the control module to set an instruction delay, nor does it require multiple repeated acquisitions within a signal cycle. It does not occupy the system resources of the control module, ensures the efficient operation of the control module, and has low power consumption and good acquisition effect.

[0054] Figure 2 This is a flowchart of a specific implementation method of S130 provided by an embodiment of the present invention. Figure 2 Based on the above embodiments, optionally, in step S130, after the acquisition timer expires, an overflow interrupt signal is triggered, and the control module receives the overflow interrupt signal of the acquisition timer and acquires the control guide signal, including:

[0055] S131 , when the acquisition timer reaches a 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 guide signal.

[0057] Among them, when the waveform timer triggers the overflow interrupt signal, that is, the control guide signal is flipped from the first level to the second level, at this time, the control module controls the acquisition timer to start timing, and triggers the overflow interrupt signal after the first time, and the control module performs signal acquisition on the control guide signal at the second level.

[0058] When performing signal acquisition, by delaying the first time of the acquisition timer, the control module can avoid the moment when the control guide signal just flips from the first level to the second level when acquiring the control guide signal, and trigger the overflow interrupt signal before the second level flips 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 an accurate value with a stable state.

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

[0060] Among them, when the first level is flipped to the second level, the stability at the second level gradually changes from unstable to stable, and becomes unstable again when the second level is about to flip to the first level. Therefore, by being in the range of 60%-70% of the duration of the second level, the second level is in the most stable period of the signal, and the collection of the control guidance signal within this range is more accurate.

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

[0062] Figure 3 This is a flowchart of a specific implementation method of S140 provided by an embodiment of the present invention. 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 a digital electrical signal according to the control guidance signal and converts it into a voltage level signal.

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

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

[0066] When the charging pile and the charged device are not connected, the detection signal is not divided, and the voltage level signal has the same voltage as the detection signal. The voltage level signal can be a first voltage, which indicates that the charging pile and the charged device are not connected.

[0067] When the charging station and the device are connected, the detection signal is divided, and the voltage level signal can be a second voltage or a third voltage. Both the second voltage and the third voltage are smaller than the voltage of the detection signal. The second and third voltages can be used to indicate that the charging station and the device are connected.

[0068] When the charging pile is connected to the charged device and is not charging, the voltage divided 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 charged device are connected and are not charging.

[0069] When the charging pile is connected to the charged device and charging is in progress, the voltage divided value of the detection signal is larger, and the voltage level signal can be a third voltage, which can be used to indicate that the charging pile and the charged device are connected and charging is in progress.

[0070] The embodiment of the present invention realizes the judgment of the connection relationship between the charging pile and the charged device by comparing the voltage level signal with the first voltage, the second voltage and the third voltage. The control guidance signal collected by the present invention is accurate. Therefore, the judgment of the connection relationship between the charging pile and the charged device is also highly accurate.

[0071] Figure 4 This is a flowchart of a specific implementation method of S142 provided by an embodiment of the present invention. Figure 4 Based on the above embodiments, optionally, S142, the control module is configured to detect the connection status between the charging pile and the charged device according to 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, the charging pile and the charged device are not connected.

[0073] When the charging pile and the charged device are not connected, the voltage level signal at this time is the actual magnitude of the voltage of the detection signal. The voltage level signal at this time can be a first voltage, which is the same as the voltage of the detection signal and is used to indicate that the charging pile and the charged device 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 and the charged device are connected but not charging.

[0075] Among them, when the charging pile and the charged device are connected, the detection signal is divided at this time. When the charging pile and the charged device are not charging, the divided voltage 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 charged device are connected and not charging.

[0076] Optionally, the second voltage is ¾ of the first voltage, and the second voltage may be 9V.

[0077] S1423: When the voltage level signal is the third voltage, the charging pile and the charged device are connected and charging is in progress.

[0078] When the charging pile is connected to the charged device and charging is in progress, the voltage value of the detection signal is larger, and the voltage level signal can be a third voltage. The third voltage can be used to indicate that the charging pile and the charged device 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 1 / 2 of the first voltage, and the third voltage may be 6V.

[0080] Figure 5 This is a flow chart of another method for collecting voltage of a charging pile control guide circuit provided by an embodiment of the present invention. Figure 5 Based on the above embodiments, optionally, after S130, when the collection timer expires and triggers an overflow interrupt signal, the control module receives the overflow interrupt signal of the collection timer and collects the control guide signal, and further includes:

[0081] S150 , the collection timer triggers multiple overflow interrupts, and the control module collects the control guidance signal according to the time of each overflow interrupt.

[0082] The acquisition timer performs timing once in each cycle of the control pilot signal. Therefore, the control module can perform signal acquisition once for the second level in different cycles of the control pilot signal.

[0083] Specifically, when the control pilot 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 pilot signal within the cycle.

[0084] When the control pilot signal changes from the first level to the second level again, the waveform timer triggers the overflow interrupt signal again, the acquisition timer is restarted, and the waveform timer begins a new round of timing. When the acquisition timer triggers the overflow interrupt, the control module collects the control pilot signal within that period.

[0085] For example, when the collection timer triggers 20 overflow interrupts, the control module collects 20 control pilot signals. With this setting, only 20 samples are needed to obtain data of 20 control pilot signals.

[0086] However, to ensure data accuracy, existing technologies require multiple sampling cycles, for example, 20 times. Data filtering and calculation are then performed to obtain data for a single control pilot signal. To obtain data for 20 control pilot signals, 4,000 control pilot signal samples are required. Consequently, existing technologies result in high operating pressure and energy consumption for the control module, as well as low sampling efficiency and poor sampling quality.

[0087] Continue to refer Figure 5 Based on the above embodiments, optionally, in step S150, the acquisition timer triggers multiple overflow interrupts, and the control module collects the control guidance signal according to the time of each overflow interrupt, and then includes:

[0088] S160. The control module generates digital electrical signals according to the respective control guide signals and converts the digital electrical signals into multiple voltage level signals.

[0089] When the control module collects multiple control pilot signals, each control pilot signal can be generated into a digital electrical signal and converted into a voltage level signal in sequence.

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

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

[0092] The present invention also provides a charging pile. The voltage acquisition method of the charging pile control and guidance circuit provided by any embodiment of the present invention has the corresponding beneficial effects of the acquisition method, which will not be described in detail.

[0093] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0094] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for collecting voltage of a charging pile control guide circuit, characterized in that: The control 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; The voltage acquisition method of the charging pile control guide circuit includes: The control module controls the signal output module to output a detection signal to the charged device and controls the start of the waveform timer; the detection signal is converted into a control guidance signal according to the connection status between the charging pile and the charged device, and the detection signal and the control guidance signal have the same frequency; The waveform timer monitors the control pilot signal, and when the control pilot signal flips from the first level to the second level, the waveform timer triggers an overflow interrupt signal; the control module receives the overflow interrupt signal of the waveform timer and controls the acquisition timer to start; The collection timer triggers an overflow interrupt signal after timing ends, and the control module receives the overflow interrupt signal of the collection timer and collects the control guidance signal; 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.

2. The voltage acquisition method of the charging pile control guide circuit according to claim 1, characterized in that: The overflow interrupt signal is triggered after the acquisition timer ends, and the control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal, which includes: When the acquisition timer reaches the first time, an overflow interrupt signal is triggered; The control module receives an overflow interrupt signal of the acquisition timer and acquires the control guidance signal.

3. The voltage acquisition method of the charging pile control guide circuit according to claim 2, characterized in that: The first time is within a range of 60%-70% of a duration of the control pilot signal being at the second level.

4. The voltage acquisition method of the charging pile control guide circuit according to claim 1, characterized in that: 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: The control module generates a digital electrical signal according to the control guide signal and converts the digital electrical signal into the voltage level signal; The control module is used to detect the connection status between the charging pile and the charged device according to the relationship between the voltage level signal and the first voltage, the second voltage and the third voltage.

5. The voltage acquisition method of the charging pile control guide circuit according to claim 4, characterized in that: The control module is configured to detect the connection status between the charging pile and the charged device according to 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, the charging pile and the charged device are not connected; When the voltage level signal is the second voltage, the charging pile and the charged device are connected but not charging; When the voltage level signal is the third voltage, the charging pile and the charged device are connected and charging is in progress; the first voltage is greater than the second voltage; and the second voltage is greater than the third voltage.

6. The voltage acquisition method of the charging pile control guide circuit according to claim 4, 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.

7. The voltage acquisition method of the charging pile control guide circuit according to claim 1, characterized in that: After the acquisition timer triggers an overflow interrupt signal after timing ends, the control module receives the overflow interrupt signal of the acquisition timer and acquires the control guidance signal, and further includes: The acquisition timer triggers multiple overflow interrupts, and the control module respectively acquires the control guidance signal according to the time of each overflow interrupt.

8. The voltage acquisition method of the charging pile control guide circuit according to claim 7, 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, and then includes: The control module generates a digital electrical signal according to each of the control guide signals and converts the digital electrical signal into a plurality of voltage level signals; The control module selects the middle value of each of the voltage level signals as the target voltage level signal, and detects the connection status between the charging pile and the charged device according to the target voltage level signal.

9. A charging pile, characterized in that: A voltage acquisition method for a charging pile control guide circuit as described in any one of claims 1 to 8 is adopted.

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