Power supply system capable of realizing secure access and power supply access method

Abstract

The invention discloses a power supply system capable of realizing secure access, and relates to a power supply system capable of realizing secure access and a power supply access method, the power supply system capable of realizing secure access comprises a battery, a control module, a detection module, an output control module and an output port; the output port is used for connecting an external power supply or an external load; the output control module comprises a detection loop; the detection loop is provided with a current limiting device; the detection module comprises a trigger circuit and a detection circuit, and the control module is used for conducting a detection loop according to a trigger signal, calculating a sampling voltage and judging whether a connection fault exists or not; through the control logic of'default full disconnection 'and'first detection and second power-on', a path of dangerous large current generated due to reverse connection or short circuit at the moment of connection is cut off from the source, traditional afterward fusing protection is improved to beforehand intelligent prevention, and potential safety hazards in the connection stage are thoroughly eliminated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery system, and particularly relates to a power supply system capable of realizing safe access and a power supply access method. BACKGROUND

[0002] At present, the design concept of motorcycle auxiliary power supplies or starting power supplies on the market is mostly still derived from traditional lead-acid batteries. A common feature of such power supplies is that the output ports (positive output contact and negative output contact) are usually in a default on state after the system is powered on.

[0003] This "default on" design has serious safety hazards in actual use. When users connect such power supplies to motorcycle batteries or other devices, if the operation is not careful, the positive and negative terminals are easily reversed or the output port is short-circuited. Due to the default output of the power supply, once the reverse connection or short circuit occurs, a large inrush current will be generated, causing the connection terminal to spark, the connection cable to melt, and even causing a fire, which poses a serious threat to user and device safety.

[0004] Although some existing power supply products may integrate simple fuses and other overcurrent protection measures, this is a kind of post-protection mechanism, that is, the fuse will be blown after the dangerous current has been generated, and it cannot fundamentally prevent accidents. At present, there is still a lack of a low-cost and high-reliability power supply system that can automatically and safely complete connection state detection when the user connects the load, and only turns on the main power loop after confirming that the connection is correct.

[0005] Therefore, there is an urgent need in the art for a power supply device and its control method that can fundamentally eliminate such connection stage safety hazards, that is, the output port is in a default off state before confirming that the external connection is safe and reliable, thereby realizing the essential safety from "post-protection" to "prevention". SUMMARY

[0006] The purpose of the present application is to avoid the deficiencies in the prior art and provide a battery system technology that can effectively avoid safety hazards caused by incorrect connections.

[0007] The purpose of the present application is achieved by the following technical solutions: According to one of the present application, a power supply system capable of realizing safe access is provided, comprising: a battery, a control module, a detection module, an output control module and an output port; the output port is used for connecting an external power supply or an external load; the control module is connected with the output control module; the battery is connected with the output port through the output control module; the output control module comprises a detection loop; the detection loop is provided with a current limiting device; the detection module comprises a trigger circuit and a detection circuit, the trigger circuit is used for generating a trigger signal, and the detection circuit is used for acquiring a sampling voltage; the control module is used for turning on the detection loop according to the trigger signal, and calculating the sampling voltage to judge whether there is a connection fault.

[0008] Specifically, the output control module further comprises a main loop; if the sampling voltage is greater than 0 and less than a preset first voltage threshold, the control module judges that the connection is normal, and then turns on the main loop.

[0009] More specifically, the control module is further connected with an alarm module; if the sampling voltage is greater than a preset second voltage threshold, the alarm module generates a corresponding alarm signal.

[0010] Another specific, the current limiting device comprises a first MOS tube and a detection load, the source or drain of the first MOS tube is connected with the detection load; the main loop comprises a second MOS tube and a third MOS tube; the source or drain of the second MOS tube is connected with the source or drain of the third MOS tube, and the turn-off directions of the second MOS tube and the third MOS tube are opposite; the control module is connected with the gate of the first MOS tube, the second MOS tube and the third MOS tube respectively.

[0011] More specifically, one end of the detection load is connected with the drain of the first MOS tube, and the other end of the detection load is connected with the drain of the second MOS tube or the third MOS tube and the detection circuit respectively.

[0012] The above, the output port comprises a first output port and a second output port; the trigger circuit comprises a first switching device, a first capacitor, a first resistor and a second switching device; the control end of the first switching device is connected with the second output port; the first capacitor and the first resistor are connected in parallel; one end of the first capacitor is connected with the output end of the first switching device, and the other end of the first capacitor is connected with the control end of the second switching device; the input end of the second switching device is connected with the first output port, and the output end is used for generating and outputting the trigger signal.

[0013] Further, the first switch device comprises a fourth MOS tube, a gate of the fourth MOS tube is connected with the second output port end, and a source is grounded; the second switch device comprises a fifth MOS tube; one end of the first capacitor is connected with a drain of the fourth MOS tube, and the other end of the first capacitor is connected with a gate of the fifth MOS tube; a source of the fifth MOS tube is connected with the first output port, and a drain is used for generating and outputting a trigger signal; the trigger circuit further comprises a first stabilizing tube, a negative pole of the first stabilizing tube is connected with the gate of the fourth MOS tube, and a positive pole is connected with the second output port end.

[0014] Another specific embodiment further comprises a key wake-up module; the key wake-up module is connected with the first output port (P+) and is used for generating a first wake-up signal according to the output port; when the battery power is lower than a set first power threshold, the control module controls the battery not to output voltage externally and the internal power supply module not to output internal working voltage, and enters a sleep mode; When the battery is in the sleep mode, if the control module receives the first wake-up signal, the control module controls the battery to restore the internal working voltage and to output voltage externally.

[0015] More specifically, the internal power supply module and a charging wake-up module are further included; the internal power supply module is connected with the battery module and the control module respectively and is used for outputting the internal working voltage; the charging wake-up module is connected with the output port and the internal power supply module respectively and is used for generating a second wake-up signal when an external power supply is connected to the battery; when the battery is in the sleep mode, if the internal power supply module receives the second wake-up signal, the internal power supply module restores the internal working voltage and the battery restores the external output voltage.

[0016] More specifically, the charging wake-up module comprises a first triode and a second triode, a base of the first triode and the second triode is connected with a positive output end of the starting power supply, an emitter of the first triode is connected with a negative output end of the starting power supply, and a collector of the first triode is connected with a base of the second triode; an emitter of the second triode is connected with a base of the first triode; a collector of the second triode is used for outputting the second wake-up signal.

[0017] According to another aspect of the present application, a power supply access method is provided, which is applied in the above-mentioned power supply system capable of realizing safe access, and comprises the following steps: S1: generating a trigger signal according to a potential change of the output port; S2: turning on a detection loop according to the trigger signal; S3: sampling a voltage of the detection loop and calculating a sampling voltage; S4: judging whether a connection fault exists according to the sampling voltage; S5: if the connection is normal, turning on a main loop to supply power or charge.

[0018] Specifically, if the sampling voltage is greater than 0 and less than a preset first voltage threshold, it is judged that the connection is normal; if the sampling voltage is greater than a second voltage threshold, it is judged that there is a short circuit fault, the detection circuit is cut off at the same time, and a short circuit alarm is performed; if the sampling voltage is greater than a third voltage threshold, it is judged that there is a reverse connection fault, the detection circuit is cut off at the same time, and a reverse connection alarm is performed.

[0019] The application has the following beneficial effects: a power supply system capable of realizing safe access, comprising a battery, a control module, a detection module, an output control module and an output port; the output port is used for connecting an external power supply or an external load; the control module is connected with the output control module; one end of the battery is connected with a first output port, and the other end is connected with a second output port through the output control module; the output control module comprises a detection circuit; the detection circuit is provided with a current limiting device; the detection module comprises a trigger circuit and a detection circuit, the trigger circuit is used for generating a trigger signal, and the detection circuit is used for acquiring a sampling voltage; the control module is used for turning on the detection circuit according to the trigger signal, and calculating the sampling voltage to judge whether there is a connection fault; through the control logic of "default full disconnection" and "detecting first and then energizing", the path of dangerous large current caused by reverse connection or short circuit at the moment of connection is cut off from the source, the traditional post-fault fuse protection is upgraded to pre-intelligent prevention, and the safety hazard in the connection stage is completely eliminated. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 is a block schematic diagram of the electrical principle of a power supply system capable of realizing safe access according to an embodiment of the present application; Figure 2 is a circuit principle schematic diagram of an output control module of a power supply system capable of realizing safe access according to an embodiment of the present application; Figure 3 is a circuit principle schematic diagram of a trigger circuit of a power supply system capable of realizing safe access according to an embodiment of the present application; Figure 4 is a circuit principle schematic diagram of a detection circuit of a power supply system capable of realizing safe access according to an embodiment of the present application; Figure 5 is a circuit principle schematic diagram of an internal power supply module of a power supply system capable of realizing safe access according to an embodiment of the present application; Figure 6This is a schematic diagram of the circuit principle of a button wake-up module of a power system capable of secure access, according to an embodiment of this application. Figure 7 This is a schematic diagram of the circuit principle of a charging wake-up module of a power system that can achieve secure access, according to an embodiment of this application. Figure 8 This is a schematic diagram of the circuit principle of an alarm module for a power system capable of secure access, according to an embodiment of this application. Figure 9 This is a schematic flowchart of a power access method according to an embodiment of this application. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0023] Example 1 One implementation method of the power supply system capable of secure access according to this application is as follows: Figures 1 to 8 As shown, it includes: a battery, a control module, a detection module, an output control module, and an output port.

[0024] The output ports include a first output port P+ and a second output port P- for connecting an external power supply or an external load.

[0025] The control module is connected to the output control module; one end of the battery is connected to the first output port P+, and the other end is connected to the second output port P- through the output control module.

[0026] The output control module includes a main circuit and a detection circuit.

[0027] The detection circuit includes a detection load R114 and a first MOSFET Q40; the source or drain of the first MOSFET Q40 is connected to the detection load; the detection load is a resistor; in some embodiments, the detection load is a positive temperature coefficient thermistor (PTC), whose resistance increases sharply with its own temperature. In the event of the aforementioned short circuit, a large current will immediately flow through the PTC, causing it to heat up and enter a high-resistance state in a very short time, thereby limiting the current to a very small safe value that will not damage any components. This provides a valuable safety window for the MCU's detection and judgment.

[0028] The main loop comprises a second MOS Q17 and a third MOS Q18; a source or a drain of the second MOS Q17 is connected with a source or a drain of the third MOS Q18, and the off direction of the second MOS Q17 and the third MOS Q18 is opposite; and the control module is connected with the gate of the first MOS Q40, the second MOS Q17 and the third MOS Q18 respectively.

[0029] The other end of the detection load R114 is connected with the drain of the second MOS Q17 or the third MOS Q18, and the detection circuit is connected with the other end of the detection load R114.

[0030] The detection module is connected with the second output port P-, the control module and the output control module respectively; the detection module comprises a trigger circuit and a detection circuit; the trigger circuit is used for generating a trigger signal according to the potential change of the output port; and the detection circuit is used for acquiring the sampling voltage of the detection loop.

[0031] The control module comprises a built-in main control MCU; the main control MCU controls the first MOS Q40 to turn on the detection loop according to the trigger signal, and calculates the sampling voltage to determine whether there is a connection fault; if it is determined that the connection is normal, the main loop is turned on by controlling the second MOS Q17 and the third MOS Q18 to supply power or charge.

[0032] The control module is further connected with an alarm module; if the sampling voltage is greater than a preset second voltage threshold, the alarm module generates a corresponding alarm signal, and the alarm is performed through the connected buzzer.

[0033] In the power supply system capable of realizing safe access, the detection function and the power transmission function are separated by setting the independent detection loop and the main loop, and the control logic of "default full disconnection" and "first detection, then power on" cuts off the path of dangerous large current caused by reverse connection or short circuit in the connection moment from the source, improves the traditional post-fusion protection to the intelligent prevention in advance, and completely eliminates the safety hazards in the connection stage. The detection load R114 in the detection loop provides the overcurrent protection at the hardware level, so that even if the judgment logic fails, the fault current can be limited in the safe range, and the high reliability of the system is ensured.

[0034] According to one aspect of the present application, a power supply access method is also provided, which is applied in the power supply system capable of realizing safe access, as shown in Figure 9 The method comprises the following steps: S1: generating a trigger signal according to the potential change of the output port; S2: Turn on the detection circuit according to the trigger signal; S3: Sample the voltage of the detection circuit and calculate the sampling voltage; S4: Determine whether there is a connection fault according to the sampling voltage; S5: If the connection is normal, turn on the main circuit for power supply or charging.

[0035] Specifically, the main control MCU determines whether there is a connection fault as follows: 1) If the sampling voltage V_detect is greater than 0 and less than a preset first voltage threshold V_th1, it is determined that the connection is normal.

[0036] If the battery and the external load are normally connected in series, at this time, the second output port P- is connected to the negative electrode of the external load through the internal B-isopotential, so the sampling voltage V_detect > 0V. Therefore, the first voltage threshold V_th1 can be set to a positive threshold close to 0V, such as 0.5V.

[0037] That is, when the sampling voltage V_detect < the first voltage threshold V_th1, the main control MCU determines that the connection with the external load is correct, and then controls the output control module to disconnect the detection circuit and turn on the main circuit to normally supply power to the external load.

[0038] 2) If the sampling voltage is greater than a second voltage threshold, it is determined to be a short circuit fault, the detection circuit is disconnected, and a short circuit alarm is performed.

[0039] If the first output port P+ and the second output port P- are short-circuited by a metal object, and the small circuit switch is closed, the second output port P- will be pulled up to the potential of the positive electrode B+ of the battery through the short-circuit point. Therefore, the sampling voltage V_detect ≈ the battery voltage V_bat (for example, 12V). Therefore, the corresponding second voltage threshold V_th2 and the threshold V_th3 can be set according to the battery voltage V_bat.

[0040] When the second voltage threshold V_th2 < the sampling voltage V_detect < the threshold V_th3, the main control MCU determines that it is a short circuit and controls the main circuit and the detection circuit to remain disconnected, while performing a short circuit alarm.

[0041] 3) If the sampling voltage is greater than a third voltage threshold, it is determined to be a reverse connection fault, the detection circuit is disconnected, and a reverse connection alarm is performed.

[0042] If the external load is connected in reverse, it forms a reverse series connection with the battery. In this case, the potential of the second output port P- will be much higher than the potential of the battery B-. At this time, the sampling voltage V_detect ≈ 2 * V_bat (e.g., 24V). Therefore, the third threshold V_th4 can be configured to a threshold that is significantly higher than V_bat (e.g., 18V).

[0043] When the sampling voltage V_detect > the third threshold V_th4, the main control MCU determines that it is reverse connection and controls the main circuit and detection circuit to remain disconnected, while simultaneously issuing a reverse connection alarm.

[0044] Example 2 One implementation method of the power system and power access method that enables secure access according to this application is as follows: Figures 1 to 9 As shown, the main technical solution of this embodiment is basically the same as that of Embodiment 1. Features not explained in this embodiment are explained using the methods in Embodiment 1, and will not be repeated here. The difference between this embodiment and Embodiment 1 is as follows: The trigger circuit includes a first switching device, a first capacitor C34, a first resistor R77, and a second switching device.

[0045] The control terminal of the first switching device is connected to the second output port P- terminal; the first capacitor C34 and the first resistor R77 are connected in parallel; one end of the first capacitor C34 is connected to the output terminal of the first switching device, and the other end of the first capacitor C34 is connected to the control terminal of the second switching device; the input terminal of the second switching device is connected to the first output port P+, and the output terminal is used to generate and output a trigger signal.

[0046] Specifically, the first switching device includes a fourth MOSFET Q28, the gate of which is connected to the second output port P-, and the source is grounded; the second switching device includes a fifth MOSFET Q19; one end of the first capacitor C34 is connected to the drain of the fourth MOSFET Q28, and the other end of the first capacitor C34 is connected to the gate of the fifth MOSFET Q19; the source of the fifth MOSFET Q19 is connected to the first output port P+, and the drain is used to generate and output a trigger signal.

[0047] Furthermore, the trigger circuit also includes a first Zener diode ZD6, the negative terminal of which is connected to the gate of the fourth MOSFET Q28, and the positive terminal is connected to the P- terminal of the second output port.

[0048] Specific working principle: When the user connects this power supply to an external load or power source, a preliminary circuit is established once the clips contact the battery terminals. At this time, the voltage from the external battery will act on the trigger circuit through the second output port P-. When the voltage at the second output port P- exceeds the breakdown voltage of the Zener diode ZD6, the fourth MOSFET Q28 will be triggered to turn on, charging the first capacitor C34. During charging, the second MOSFET Q19 will be turned on, and the voltage level signal K_DET will change, forming a trigger signal output to the main control MCU of the control module.

[0049] Regardless of whether the external load or external power supply is connected in the correct or reverse direction, as long as the potential of the second output port P-point relative to the internal ground (GND) of the power supply changes drastically (high voltage or negative voltage appears), the circuit will generate a level transition signal and send this trigger signal (K_DET) to the main control MCU.

[0050] Once the main control MCU detects a valid signal on the K_DET pin, it determines that an external load is being connected and immediately starts the connection status detection program.

[0051] After the main control MCU starts the detection program, it will control the detection circuit to be turned on and keep the main circuit in a disconnected state.

[0052] Example 3 One implementation method of the power system and power access method that enables secure access according to this application is as follows: Figures 1 to 9 As shown, the main technical solution of this embodiment is basically the same as that of Embodiment 1 or Embodiment 2. Features not explained in this embodiment adopt the explanations in Embodiment 1 or Embodiment 2, and will not be repeated here. The difference between this embodiment and Embodiment 1 or Embodiment 2 is: The aforementioned power system capable of secure access also includes a button wake-up module, an internal power supply module, and a charging wake-up module.

[0053] The button wake-up module is connected to the output port and is used to generate a first wake-up signal based on the output port. When the battery power is lower than the set first power threshold, the control module controls the battery not to output voltage to the outside and the internal power supply module not to output internal operating voltage, thus entering a sleep mode. When the battery is in sleep mode, if the control module receives the first wake-up signal...

[0054] The internal power supply module is connected to both the battery module and the control module to output the internal operating voltage; the charging wake-up module is connected to both the output port and the internal power supply module to generate a second wake-up signal when the battery is connected to an external power source.

[0055] When the battery is in sleep mode, if the internal power supply module receives the first wake-up signal or the second wake-up signal, the internal power supply module restores its internal operating voltage and the battery restores its external output voltage.

[0056] More specifically, the charging wake-up module includes a first transistor Q8 and a second transistor Q13. The bases of the first transistor Q8 and the second transistor Q13 are connected to the positive output terminal of the power supply, the emitter of the first transistor Q8 is connected to the negative output terminal of the power supply, and the collector of the first transistor Q8 is connected to the base of the second transistor Q13. The emitter of the second transistor Q13 is connected to the base of the first transistor Q8. The collector of the second transistor Q13 is used to output a second wake-up signal.

[0057] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that this application is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of this application. Therefore, although this application has been described in detail through the above embodiments, this application is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of this application, the scope of which is determined by the scope of the appended claims.

Claims

1. A power supply system capable of realizing secure access, characterized by comprising: The power supply system comprises a battery, a control module, a detection module, an output control module and an output port. The output port is used for connecting an external power supply or an external load. The control module is connected with the output control module, and the battery is connected with the output port through the output control module. The output control module comprises a detection loop, and the detection loop is provided with a current limiting device. The detection module comprises a trigger circuit and a detection circuit, the trigger circuit is used for generating a trigger signal, and the detection circuit is used for acquiring a sampling voltage. The control module is used for turning on the detection loop according to the trigger signal, and calculating the sampling voltage to determine whether a connection fault exists.

2. The power supply system capable of realizing safe access according to claim 1, wherein the output control module further comprises a main loop. If the sampling voltage is greater than 0 and less than a preset first voltage threshold, the control module determines that the connection is normal, and then turns on the main loop.

3. The power supply system capable of realizing safe access according to claim 2, wherein the control module is further connected with an alarm module. If the sampling voltage is greater than a preset second voltage threshold, the alarm module generates a corresponding alarm signal.

4. The power supply system capable of realizing safe access according to claim 2, wherein the current limiting device comprises a first MOS tube (Q40) and a detection load (R114), and the source or drain of the first MOS tube (Q40) is connected with the detection load (R114). The main loop comprises a second MOS tube (Q17) and a third MOS tube (Q18), the source or drain of the second MOS tube (Q17) is connected with the source or drain of the third MOS tube (Q18), and the turn-off directions of the second MOS tube (Q17) and the third MOS tube (Q18) are opposite. The control module is connected with the gate of the first MOS tube (Q40), the second MOS tube (Q17) and the third MOS tube (Q18) respectively.

5. The power supply system capable of realizing safe access according to claim 4, wherein one end of the detection load (R114) is connected with the drain of the first MOS tube (Q40), and the other end of the detection load (R114) is connected with the drain of the second MOS tube (Q17) or the third MOS tube (Q18) and the detection circuit respectively.

6. The power supply system capable of realizing safe access according to any one of claims 1 to 5, wherein the output port comprises a first output port (P+) and a second output port (P-). The trigger circuit comprises a first switch device, a first capacitor (C34), a first resistor (R77) and a second switch device. ​ ​ ​ ​ ​ ​ The control end of the first switch device is connected with the second output port (P-); the first capacitor (C34) and the first resistor (R77) are connected in parallel; one end of the first capacitor (C34) is connected with the output end of the first switch device, and the other end of the first capacitor (C34) is connected with the control end of the second switch device; the input end of the second switch device is connected with the first output port (P+), and the output end is used for generating and outputting the trigger signal.

7. The power supply system capable of realizing safe access according to claim 6, characterized in that: The first switch device comprises a fourth MOS tube (Q28), and the gate of the fourth MOS tube (Q28) is connected with the second output port (P-), and the source is grounded; The second switch device comprises a fifth MOS tube (Q19); One end of the first capacitor (C34) is connected with the drain of the fourth MOS tube (Q28), and the other end of the first capacitor (C34) is connected with the gate of the fifth MOS tube (Q19); the source of the fifth MOS tube (Q19) is connected with the first output port (P+), and the drain is used for generating and outputting the trigger signal; The trigger circuit further comprises a first stabilizing tube (ZD6), the negative electrode of the first stabilizing tube (ZD6) is connected with the gate of the fourth MOS tube (Q28), and the positive electrode is connected with the second output port (P-).

8. The power system capable of secure access according to claim 6, wherein, Further comprising a key wake-up module; The key wake-up module is connected with the first output port (P+), and is used for generating a first wake-up signal according to the output port; When the battery power is lower than a set first power threshold, the control module controls the battery to not output voltage externally, and the internal power supply module does not output internal working voltage, and enters a sleep mode; When the battery is in the sleep mode, if the control module receives the first wake-up signal, the control module controls the battery to restore the internal working voltage and output voltage externally.

9. The power system capable of secure access according to claim 8, wherein, Further comprising: An internal power supply module and a charging wake-up module; The internal power supply module is connected with the battery module and the control module respectively, and is used for outputting internal working voltage; The charging wake-up module is connected with the output port and the internal power supply module respectively, and is used for generating a second wake-up signal when an external power supply is connected to the battery connection; When the battery is in the sleep mode, if the internal power supply module receives the second wake-up signal, the internal power supply module restores the internal working voltage and the battery restores the external output voltage.

10. The power supply system capable of realizing safe access according to claim 9, characterized in that: The charging wake-up module comprises a first triode (Q8) and a second triode (Q13), the base of the first triode (Q8) and the second triode (Q13) is connected with the positive output end of the starting power supply, the emitter of the first triode (Q8) is connected with the negative output end of the starting power supply, the collector of the first triode (Q8) is connected with the base of the second triode (Q13); the emitter of the second triode (Q13) is connected with the base of the first triode (Q8); the collector of the second triode (Q13) is used for outputting the second wake-up signal.

11. A power access method applied to the power system capable of realizing safe access according to any one of claims 1 to 10, characterized in that, The method comprises the following steps: S1: generating a trigger signal according to the potential change of the output port; S2: turning on a detection circuit according to the trigger signal; S3: sampling the voltage of the detection circuit and calculating a sampling voltage; S4: judging whether there is a connection fault according to the sampling voltage; S5: if the connection is normal, turning on a main circuit to supply power or charge.

12. The power supply access method according to claim 11, wherein: if the sampling voltage is greater than 0 and less than a preset first voltage threshold, it is judged that the connection is normal; if the sampling voltage is greater than a second voltage threshold, it is judged that there is a short circuit fault, the detection circuit is cut off, and a short circuit alarm is given; if the sampling voltage is greater than a third voltage threshold, it is judged that there is a reverse connection fault, the detection circuit is cut off, and a reverse connection alarm is given.

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