Broken line detection circuit of PD fast charging line, mobile power supply and shared power bank system

Abstract

The invention relates to a disconnection detection circuit of a PD fast charge line, a mobile power supply and a shared power bank system. The disconnection detection circuit comprises a main control module, a charge and discharge management module, a no-load power supply trigger circuit and an interface module. Wherein the interface module comprises a first resistor, a first power supply end, a second power supply end, a first grounding end, a second grounding end, a CC signal end and a type-C line interface, and the first power supply end is electrically connected with the first grounding end through the first resistor; the second power supply end is electrically connected with the charging and discharging management module, the second grounding end is grounded, and the CC signal end is grounded through the no-load power supply trigger circuit; the control end of the no-load power supply trigger circuit is connected with the main control module; when the type-C line interface is not connected with charging equipment, the no-load power supply trigger circuit triggers the second power supply end to output the preset voltage, and the charging and discharging management module detects whether the interface module has current or not, so that whether the charging cable is disconnected or not is detected under the condition that a load is not connected, and the detection efficiency of disconnection of the PD fast charging line is improved.

Description

Technical Field

[0001] The present application relates to the technical field of charge and discharge management, and in particular to a disconnection detection circuit for a PD fast charging line, a mobile power source, and a shared power bank system. Background Art

[0002] With the popularity of electronic devices, Type-C interface, as a new universal interface, has gradually become the mainstream interface standard due to its advantages such as reversible pluggability, high-speed data transmission and high-power charging. However, in actual use, the problem of Type-C cable disconnection has always been an important factor affecting user experience. Once the power line, data line or ground line inside the cable is broken, it will not only cause the device to fail to charge normally, but may also cause data transmission errors and even damage the device.

[0003] In the prior art, the existing disconnection detection scheme is performed under load, but this scheme cannot be implemented for shared mobile power supplies, because the shared mobile power supplies are in a no-load state when they are returned, so the charging pile cannot monitor the disconnection of the mobile power supply. Therefore, the existing technology has the following problems with the disconnection detection function of the Type-C cable supporting the PD protocol: there is a lack of a mechanism that can detect whether the cable is disconnected without connecting to a load; the existing detection method may affect the output power of the fast charge, resulting in reduced charging efficiency; the detection accuracy is insufficient, and it is impossible to effectively distinguish whether the cable is actually disconnected, which is prone to misjudgment. Summary of the invention

[0004] The embodiments of the present application provide a PD fast charging cable disconnection detection circuit, a mobile power supply and a shared power bank system, so as to at least solve the problem in the related art that it is impossible to detect whether the charging cable is disconnected when no load is connected.

[0005] In a first aspect, an embodiment of the present application provides a PD fast charging line disconnection detection circuit, which is applied in a mobile power supply, and includes a main control module, a charge and discharge management module, a no-load power supply trigger circuit and an interface module; wherein,

[0006] The interface module includes a first resistor, a first power supply terminal, a second power supply terminal, a first ground terminal, a second ground terminal, a CC signal terminal and a type-C line interface, wherein the first power supply terminal and the first ground terminal are arranged inside the type-C line interface;

[0007] The first power supply terminal is electrically connected to the first ground through the first resistor; the second power supply terminal is electrically connected to the charge and discharge management module, the second ground terminal is grounded, and the CC signal terminal is grounded through the no-load power supply trigger circuit; the control terminal of the no-load power supply trigger circuit is connected to the main control module;

[0008] The mobile power supply is connected to a charging device via the type-C line interface. When the type-C line interface is not connected to a charging device, the main control module controls the no-load power supply trigger circuit to be turned on. After the circuit is turned on, the signal at the CC signal end is pulled low, and the second power supply end is triggered to output a preset voltage. After a preset period of time, the charge and discharge management module detects whether there is current in the interface module. If not, it is determined that the PD fast charging line is disconnected.

[0009] In one embodiment, the no-load power supply trigger circuit includes a first switch tube, a second resistor, a third resistor and a fourth resistor;

[0010] The drain of the first switch tube is connected to the CC signal end through the second resistor, the source of the first switch tube is grounded, and the gate of the first switch tube is connected to the main control module and the common ground through the third resistor and the fourth resistor respectively.

[0011] In one embodiment, the disconnection detection circuit further includes a grounding control circuit and a voltage dividing resistor.

[0012] Wherein, the grounding control circuit is connected between the main control module and the second grounding terminal; the voltage dividing resistor is connected between the common ground and the second grounding terminal; the second grounding terminal is connected to the common ground through the grounding control circuit or the voltage dividing resistor;

[0013] When the type-C line interface is connected to a charging device, the main control module controls the grounding control circuit to be turned on, and the second grounding end is connected to a common ground through the grounding control circuit;

[0014] When the type-C line interface is not connected to a charging device, the main control module controls the grounding control circuit to be disconnected, and the second grounding terminal is connected to the common ground through the voltage-dividing resistor.

[0015] In one embodiment, the disconnection detection circuit further includes a voltage acquisition circuit, and the voltage acquisition circuit is connected between the charge and discharge management module and the ground terminal;

[0016] When the type-C line interface is not connected to a charging device and the second power supply end is triggered to output a preset voltage, the charge and discharge management module detects the voltage value of the second ground end and determines whether the PD fast charging line is disconnected based on the voltage value.

[0017] In one embodiment, the grounding control circuit includes a second switch tube, a fifth resistor and a sixth resistor;

[0018] The drain of the second switch tube is connected to the second ground terminal, the source of the second switch tube is grounded, and the gate of the second switch tube is connected to the main control module and the 3.3V voltage through the fifth resistor and the sixth resistor respectively.

[0019] In one embodiment, the voltage acquisition circuit includes a seventh resistor and a first capacitor;

[0020] The first end of the seventh resistor is connected to the second ground end, and the second end is connected to the main control module. The first capacitor is connected between the second end of the seventh resistor and the common ground.

[0021] In one embodiment, the interface module further includes a second capacitor and a third capacitor, wherein the second capacitor and the third capacitor are connected between a common ground and a second power supply terminal, respectively.

[0022] In one embodiment, when the interface module is connected to a charging device, the main control module controls the no-load power trigger circuit to disconnect, the CC signal terminal is left floating, and the mobile power supply supplies power to the charging device through the type-C line interface.

[0023] In a second aspect, an embodiment of the present application provides a mobile power supply, including a battery cell and a disconnection detection circuit of the PD fast charging cable described in any of the above embodiments.

[0024] In a third aspect, an embodiment of the present application provides a shared power bank system, including a charging cabinet and a disconnection detection circuit for the PD fast charging cable provided in the second aspect.

[0025] The disconnection detection circuit of the PD fast charging line, the mobile power supply and the shared power bank system provided by the embodiments of the present application have at least the following technical effects:

[0026] A PD fast charging line disconnection detection circuit is set up, including a main control module, a charge and discharge management module, a no-load power supply trigger circuit and an interface module. Wherein, the interface module includes a first resistor, a first power supply terminal, a second power supply terminal, a first ground terminal, a second ground terminal, a CC signal terminal and a type-C line interface, wherein the first power supply terminal and the first ground terminal are arranged inside the type-C line interface; the first power supply terminal is electrically connected to the first ground through the first resistor; the second power supply terminal is electrically connected to the charge and discharge management module, the second ground terminal is grounded, and the CC signal terminal is grounded through the no-load power supply trigger circuit; the control end of the no-load power supply trigger circuit is connected to the main control module; the mobile power supply is connected to the charging device through the type-C line interface, when the type-C line interface is not connected to the charging device, the main control module controls the no-load power supply trigger circuit to turn on, after the conduction, the signal of the CC signal terminal is pulled low, and the second power supply terminal is triggered to output a preset voltage, after a preset time, the charge and discharge management module detects whether the interface module has current, if not, it is determined that the PD fast charging line is disconnected. The present application detects whether the charging cable is disconnected without connecting to a load by setting up the circuit of the no-load power supply trigger circuit and the interface module, thereby improving the detection efficiency of the PD fast charging cable disconnection.

[0027] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0029] Figure 1 This is a circuit structure diagram of a disconnection detection circuit of a PD fast charging line provided in one embodiment of the present application;

[0030] Figure 2 is a circuit schematic diagram of an interface module provided in an embodiment of the present application;

[0031] Figure 3 is a circuit schematic diagram of a no-load power supply trigger circuit provided in an embodiment of the present application;

[0032] Figure 4 is a circuit structure diagram of a disconnection detection circuit of a PD fast charging line provided in another embodiment of the present application;

[0033] Figure 5 is a circuit schematic diagram of a grounding control circuit provided in an embodiment of the present application;

[0034] Figure 6 It is a circuit schematic diagram of a voltage collection circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. Based on the embodiments provided in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0036] Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed in this application, some changes in design, manufacturing or production based on the technical content disclosed in this application are just conventional technical means, and should not be understood as insufficient content disclosed in this application.

[0037] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those of ordinary skill in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0038] Unless otherwise defined, the technical terms or scientific terms involved in this application should be understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the" and the like involved in this application do not indicate a quantitative limitation, and may represent the singular or plural. The terms "include", "comprise", "have" and any of their variations involved in this application are intended to cover non-exclusive inclusions; for example, a process, method, system, product or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units that are not listed, or may also include other steps or units inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there may be three relationships, for example, "A and / or B" can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects before and after are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0039] Based on the existing situation that it is impossible to detect whether the type-C charging cable is disconnected when no load is connected, the embodiments of the present application provide a PD fast charging cable disconnection detection circuit, a mobile power supply and a shared power bank system.

[0040] In a first aspect, an embodiment of the present application provides a disconnection detection circuit for a PD fast charging line. Figure 1 : is a circuit structure diagram of a disconnection detection circuit of a PD fast charging line. The disconnection detection circuit of the embodiment of the present application is applied in a mobile power source, especially a shared power bank in a public place.

[0041] The disconnection detection circuit of this embodiment includes a main control module, a charge and discharge management module, a no-load power supply trigger circuit and an interface module. The interface module of this embodiment includes a first resistor, a first power supply terminal, a second power supply terminal, a first ground terminal, a second ground terminal, a CC signal terminal and a type-C line interface, and the first power supply terminal and the first ground terminal are arranged inside the type-C line interface. The first power supply terminal is electrically connected to the first ground through the first resistor; the second power supply terminal is electrically connected to the charge and discharge management module, the second ground terminal is grounded, and the CC signal terminal is grounded through the no-load power supply trigger circuit; the control end of the no-load power supply trigger circuit is connected to the main control module.

[0042] For example, reference Figure 2 , Figure 2 The orange box in the middle is a type-C line interface, which includes a first resistor R1, and the resistance value can be set to 100KΩ. In this embodiment, the interface module includes at least three signal lines: power supply VBUS, CC (such as CC1), and ground terminal GND. Figure 2 The other two signal lines (DMC and DPC) in the present application do not make any improvements on the original circuit structure, so they are not described in this application. Figure 2 These signal lines are connected to the mobile power supply and the external charging device through the pads. In this embodiment, the end contacting the external charging device is defined as the first end of each signal line (i.e., the right side of the pad), and the end connected to the mobile power supply is defined as the second end of each signal line (i.e., the left side of the pad).

[0043] In this embodiment, when the interface module is connected to a charging device, the main control module controls the no-load power trigger circuit to be disconnected, the signal at the CC signal terminal is suspended, and the mobile power supplies power to the charging device through the type-C line interface. That is, under normal working conditions, the main control module on the mainboard controls the no-load power trigger circuit to be disconnected, so that the CC signal terminal is suspended, and after the charging device is connected, the CC signal terminal is triggered by the charging device itself.

[0044] In this embodiment, the mobile power supply is connected to a charging device via the type-C line interface. When the type-C line interface is not connected to a charging device, the main control module controls the no-load power supply trigger circuit to be turned on. After the circuit is turned on, the signal at the CC signal end is pulled low. After recognizing that the signal at the CC signal end is pulled low, the charge and discharge management module outputs a preset voltage to VBUS, that is, triggers the second power supply end to output a preset voltage. After a preset period of time, the charge and discharge management module detects whether there is current in the interface module. If not, it is determined that the PD fast charging line is disconnected.

[0045] Specific reference Figure 3 The no-load power supply trigger circuit includes a first switch tube Q1, a second resistor R2, a third resistor R3 and a fourth resistor R4. Specifically, the drain of the first switch tube Q1 is connected to the CC1 signal terminal through the second resistor R2, the source of the first switch tube Q1 is grounded, and the gate of the first switch tube Q1 is connected to the main control module and the common ground through the third resistor R3 and the fourth resistor R4 respectively.

[0046] In this embodiment, when the mobile power supply is used normally (supplying power to the load), the main control module outputs a detection signal (C_C_check) through the first output pin, and pulls down the gate level of the first switch tube Q1 through the detection signal (C_C_check), thereby turning off the first switch tube Q1. At this time, VBUS, type-C line, load, and GND in the interface module form a loop, so that the mainboard can normally supply power to the load through the type-C line.

[0047] When the mobile power supply is not connected to a load, the disconnection detection circuit provided in this embodiment performs disconnection detection. At this time, the gate level of the first switch tube Q1 is pulled high through the detection signal (C_C_check), so that the first switch tube Q1 is turned on. After Q1 is turned on, the CC1 signal is pulled low through R2 and Q1. The charge and discharge management module monitors the level signal of the CC signal end in real time. After recognizing that the signal at the CC signal end is pulled low, a preset voltage is output to VBUS, triggering the motherboard VBUS to output a 5V power supply. If the PD fast charging line is not disconnected, VBUS, type-C line, R1, and GND form a loop, and then the port current is collected through the charging management chip. According to the current, it is determined whether a complete loop is formed to determine whether the line is broken. If the line is not broken, the current will be detected; if the line is broken, the current cannot be detected.

[0048] In another preferred embodiment, the line break detection circuit also includes a grounding control circuit and a voltage-dividing resistor, wherein the grounding control circuit is connected between the main control module and the second ground terminal; the voltage-dividing resistor is connected between the common ground and the second ground terminal; and the second ground terminal is connected to the common ground via the grounding control circuit or the voltage-dividing resistor.

[0049] In an embodiment of the present application, when the type-C line interface is connected to a charging device, the main control module controls the grounding control circuit to be turned on, and the second grounding end is connected to the common ground through the grounding control circuit; when the type-C line interface is not connected to a charging device, the main control module controls the grounding control circuit to be turned off, and the second grounding end is connected to the common ground through the voltage divider resistor.

[0050] When the disconnection detection circuit includes a grounding control circuit, the disconnection detection can be judged by collecting the voltage in the circuit in addition to detecting the current. Figure 4The disconnection detection circuit also includes a voltage acquisition circuit, which is connected between the charge and discharge management module and the ground terminal; when the type-C line interface is not connected to a charging device and the second power supply terminal is triggered to output a preset voltage, the charge and discharge management module detects the voltage value of the second ground terminal and determines whether the PD fast charging line is disconnected based on the voltage value. If the line is not disconnected, a certain voltage value will be detected; if the line is disconnected, no voltage value will be detected.

[0051] Specific reference Figure 5 The grounding control circuit of this embodiment includes a second switch tube Q2, a fifth resistor R5 and a sixth resistor R6, wherein the drain of the second switch tube Q2 is connected to the second ground terminal C_GND, the source of the second switch tube Q2 is grounded, and the gate of the second switch tube Q2 is connected to the main control module and the 3.3V voltage through the fifth resistor R5 and the sixth resistor R6 respectively.

[0052] refer to Figure 6 The voltage acquisition circuit includes a seventh resistor R7 and a first capacitor C1, wherein the first end of the seventh resistor R7 is connected to the second ground terminal C_GND, and the second end is connected to the main control module, and the first capacitor C1 is connected between the second end of the seventh resistor R7 and the common ground. Figure 6 In the embodiment, R8 is a voltage-dividing resistor connected between the second ground terminal C_GND of the interface module and the common ground, and the resistance value of the voltage-dividing resistor R8 is 10KΩ±1%.

[0053] In a preferred embodiment, reference Figure 2 The interface module further includes a second capacitor C2 and a third capacitor C3, wherein the second capacitor C2 and the third capacitor C3 are respectively connected between a common ground and a second power supply terminal VBUS.

[0054] Combination Figure 2 , Figure 3 , Figure 5 and Figure 6In the embodiment of the present application, the power supply and ground inside the type-C line interface (i.e., the right side of the pad) are connected with a 100K (R1) resistor. In addition, on the mainboard (i.e., the left side of the pad), the ground of type-C is C_GND, and the power supply of Type-C is VBUS; C_GND of type-C is connected to GND through N-MOS (Q2); at the same time, C_GND of type-C is connected to GND through a 10K resistor (R8); C_GND is connected to the ADC acquisition pin (C_Detection) of the microcontroller through another 10K resistor (R7); the CC signal of Type-C is CC1; CC1 is connected to a 5.1K resistor (R1) and connected to GND through N-MOS (Q1); C_C_contrl is connected to the output pin of the microcontroller to control the switch of Q2; C_C_check is connected to another output pin of the microcontroller to control the switch of Q1.

[0055] In this embodiment, when the mobile power supply is in normal use (i.e., supplying power to the load), the main control module turns off Q1 and turns on Q2 by pulling the control signal C_C_contrl high and the detection signal C_C_check low. Since the internal resistance of Q2 is small, VBUS, type-C line, load, and C_GND form a loop through Q2. This allows the motherboard to supply power to the load normally through the type-C line.

[0056] When the mobile power bank is not connected to a load, a disconnection detection is performed. The main control module turns on Q1 and turns off Q2 by pulling down the control signal C_C_contrl and pulling up the detection signal C_C_check. Since Q2 is turned off, VBUS, type-C line, R1, and C_GND form a loop through R8. In addition, after Q1 is turned on, the CC1 signal is pulled down through R2 and Q1, triggering the motherboard VBUS to output a 5V power supply. The 5V power supply is divided by resistors R1 and R8, and the charge and discharge management module collects the voltage of the second ground terminal C_GND of the interface module through the detection pin C_Detection, thereby determining whether the TYPE-C line is disconnected.

[0057] In summary, the disconnection detection circuit provided in the embodiment of the present application pulls the CC signal end down to GND through the no-load power supply trigger circuit, thereby triggering VBUS to generate power, so that the power supply end and the ground end form a loop with the first resistor, so that disconnection detection can be performed. On the other hand, the grounding control circuit is used as the main circuit for normal use, so that the voltage-dividing resistor is not connected to the main circuit. If the voltage-dividing resistor is too large, the output power of the fast charge will be seriously affected; if the voltage-dividing resistor is too small, the voltage collected by C_Detection is too small, that is, the judgment accuracy of the disconnection detection is improved by setting the voltage-dividing resistor.

[0058] In a second aspect, an embodiment of the present application provides a mobile power supply, including a battery cell and a disconnection detection circuit of the PD fast charging cable described in any of the above embodiments. The disconnection detection process of this embodiment is the same as that of the disconnection detection circuit of the first aspect, and will not be repeated here.

[0059] In a third aspect, an embodiment of the present application provides a shared power bank system, including a charging cabinet and at least one disconnection detection circuit of the PD fast charging line provided in the second aspect. The disconnection detection process of this embodiment is the same as that of the disconnection detection circuit of the first aspect, and will not be repeated here.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A disconnection detection circuit for a PD fast charging line, characterized in that: Applied in mobile power supply, including main control module, charge and discharge management module, no-load power trigger circuit and interface module; The interface module includes a first resistor, a first power supply terminal, a second power supply terminal, a first ground terminal, a second ground terminal, a CC signal terminal and a type-C line interface, wherein the first power supply terminal and the first ground terminal are arranged inside the type-C line interface; The first power supply terminal is electrically connected to the first ground through the first resistor; the second power supply terminal is electrically connected to the charge and discharge management module, the second ground terminal is grounded, and the CC signal terminal is grounded through the no-load power supply trigger circuit; the control terminal of the no-load power supply trigger circuit is connected to the main control module; The mobile power supply is connected to a charging device via the type-C line interface. When the type-C line interface is not connected to a charging device, the main control module controls the no-load power supply trigger circuit to be turned on. After the circuit is turned on, the signal at the CC signal end is pulled low, and the second power supply end is triggered to output a preset voltage. After a preset period of time, the charge and discharge management module detects whether there is current in the interface module. If not, it is determined that the PD fast charging line is disconnected.

2. The disconnection detection circuit according to claim 1, characterized in that: The no-load power supply trigger circuit includes a first switch tube, a second resistor, a third resistor and a fourth resistor; The drain of the first switch tube is connected to the CC signal end through the second resistor, the source of the first switch tube is grounded, and the gate of the first switch tube is connected to the main control module and the common ground through the third resistor and the fourth resistor respectively.

3. The disconnection detection circuit according to claim 1, characterized in that: The disconnection detection circuit also includes a grounding control circuit and a voltage dividing resistor. Wherein, the grounding control circuit is connected between the main control module and the second grounding terminal; the voltage dividing resistor is connected between the common ground and the second grounding terminal; the second grounding terminal is connected to the common ground through the grounding control circuit or the voltage dividing resistor; When the type-C line interface is connected to a charging device, the main control module controls the grounding control circuit to be turned on, and the second grounding end is connected to a common ground through the grounding control circuit; When the type-C line interface is not connected to a charging device, the main control module controls the grounding control circuit to be disconnected, and the second grounding terminal is connected to the common ground through the voltage-dividing resistor.

4. The disconnection detection circuit according to claim 3, characterized in that: The disconnection detection circuit further includes a voltage acquisition circuit, and the voltage acquisition circuit is connected between the charge and discharge management module and the ground terminal; When the type-C line interface is not connected to a charging device and the second power supply end is triggered to output a preset voltage, the charge and discharge management module detects the voltage value of the second ground end and determines whether the PD fast charging line is disconnected based on the voltage value.

5. The disconnection detection circuit according to claim 3, characterized in that: The grounding control circuit includes a second switch tube, a fifth resistor and a sixth resistor; The drain of the second switch tube is connected to the second ground terminal, the source of the second switch tube is grounded, and the gate of the second switch tube is connected to the main control module and the 3.3V voltage through the fifth resistor and the sixth resistor respectively.

6. The disconnection detection circuit according to claim 4, characterized in that: The voltage acquisition circuit includes a seventh resistor and a first capacitor; The first end of the seventh resistor is connected to the second ground end, and the second end is connected to the main control module. The first capacitor is connected between the second end of the seventh resistor and the common ground.

7. The disconnection detection circuit according to claim 1, characterized in that: The interface module further includes a second capacitor and a third capacitor, wherein the second capacitor and the third capacitor are connected between a common ground and a second power supply terminal, respectively.

8. The disconnection detection circuit according to claim 1, characterized in that: When the interface module is connected to a charging device, the main control module controls the no-load power trigger circuit to be disconnected, the CC signal terminal is left floating, and the mobile power supply supplies power to the charging device through the type-C line interface.

9. A mobile power source, characterized in that: A disconnection detection circuit comprising a battery cell and a PD fast charging cable according to any one of claims 1 to 8.

10. A shared power bank system, characterized in that: It comprises a charging cabinet and at least one disconnection detection circuit of the PD fast charging line as claimed in claim 9.

Images