Power supply control circuit, power supply equipment, power supply system and power supply control method

Abstract

The invention discloses a power supply control circuit, power supply equipment, a power supply system and a power supply control method. The power supply control circuit comprises a control unit, an induction circuit unit, a signal loop switch and a main circuit unit, the induction circuit unit is used for detecting whether external equipment is connected to a power supply port of the power supply equipment or not, and when it is detected that the external equipment is connected to the power supply port of the power supply equipment, a starting signal is generated and sent to the control unit; and the control unit is used for closing the signal loop switch based on the starting signal so as to establish a signal loop with the external equipment, carrying out communication state detection with the external equipment based on the established signal loop, and starting the main circuit unit to supply power to the external equipment after the communication state detection is passed. The output reliability and safety of the power supply control circuit are improved, and the standby power consumption of the circuit can be reduced.

Description

Technical Field

[0001] This application relates to the technical field of power supply control, and specifically relates to a power supply control circuit, a power supply device, a power supply system, and a power supply control method. Background Art

[0002] For two devices that need to be frequently connected or disconnected through a terminal block or a socket, such as a power supply device and a power receiving device, the common design idea when disconnecting the connection between the two devices is to disconnect the high-voltage or high-power circuit connecting the two devices from the internal circuit of the device, but other signal circuits are not disconnected. After the signal circuit is disconnected from the external device, it is equivalent to being exposed to the external environment of the device.

[0003] When the two devices are disconnected, the signal terminals exposed to the external environment of the device are extremely vulnerable to external signal interference. In particular, static electricity, short circuits caused by human operations, mistriggers, and out-of-control within the system may cause high voltage to be output from the signal weak current port, resulting in safety problems such as electric shock risks, equipment damage, or fires. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of this application is to provide a power supply control circuit, a power supply device, a power supply system, and a power supply control method, which can completely disconnect the connection circuit from the inside of the device to the external terminal when the two devices are not connected through a terminal block or a socket, thereby avoiding safety problems such as electric shock risks, equipment damage, or fires caused by external signal interference to the signal terminals exposed to the external environment of the device, and improving the safety and reliability of the power supply system.

[0005] To achieve the above purpose and other related purposes, this application provides a power supply control circuit applied to a power supply device, including:

[0006] A control unit, and an induction circuit unit, a signal circuit switch, and a main circuit unit connected to the control unit;

[0007] The induction circuit unit is used to detect whether there is an external device connected to the power supply port of the power supply device. When it detects that there is an external device connected to the power supply port of the power supply device, it generates and sends a start signal to the control unit;

[0008] The control unit is used to close the signal circuit switch based on the start signal to establish a signal circuit with the external device, and perform a first communication status detection with the external device based on the established signal circuit. When the first communication status detection passes, the main circuit unit is started to supply power to the external device.

[0009] In an optional embodiment of this application, the induction circuit unit includes a Hall detection circuit and / or a metal detection circuit;

[0010] The Hall detection circuit senses whether an external device is connected to the power supply port of the power supply device by detecting a Hall detection magnet disposed at a preset position in the external device.

[0011] The metal detection circuit senses whether an external device is connected to the power supply port of the power supply device by detecting a metal detection block disposed at a preset position in the external device.

[0012] In an alternative embodiment of the present application, the power supply control circuit further includes a main circuit switch connected between the main circuit unit and the power supply terminal of the power supply port.

[0013] When the first communication status detection passes, the control unit activates the main circuit unit and closes the main circuit switch to supply power to the external device.

[0014] In an alternative embodiment of the present application, when the first communication status detection passes, the control unit activates the main circuit unit and performs a second communication status detection with the external device based on the established signal loop. After the second communication status detection passes, the main circuit switch is closed to supply power to the external device.

[0015] In an alternative embodiment of the present application, the control unit is further configured to disconnect the signal loop switch when the first communication status detection fails or the second communication status detection fails, so as to disconnect the signal loop with the external device.

[0016] In an alternative embodiment of the present application, a connection detection circuit is further included, and the control unit is sequentially connected to the communication terminal of the power supply port through the connection detection circuit and the signal loop switch.

[0017] The connection detection circuit is configured to perform communication status detection with the external device based on the established signal loop and send the communication status detection result to the control unit.

[0018] In an alternative embodiment of the present application, the main circuit unit includes a power conversion control chip and a voltage conversion system, and the power conversion control chip is connected to the control unit.

[0019] The control unit is configured to control the operation of the power conversion control chip.

[0020] The power conversion control chip is configured to monitor, regulate, and control the input power supply, and control the operation of the voltage conversion system to output a stable voltage required by the external device.

[0021] In an alternative embodiment of the present application, the control unit includes a central processing system, an isolation switch control, an optoelectronic switch, a main power chip startup control system, and an auxiliary power control switch;

[0022] The central processing system is connected to the induction circuit unit, and is configured to close the signal loop switch based on the startup signal to establish a signal loop with the external device, and perform a first communication status detection with the external device based on the established signal loop;

[0023] The input end of the isolation switch control is connected to the induction circuit unit or the central processing system, and the output end is connected to the input end of the main power chip startup control system through the optoelectronic switch;

[0024] The output end of the main power chip startup control system is connected to the control end of the power conversion control chip;

[0025] The isolation switch control is configured to, when the first communication status detection passes, control the main power chip startup control system through the optoelectronic switch to guide the power conversion control chip to start the voltage conversion system;

[0026] The auxiliary power control switch is connected between the power conversion control chip and the internal auxiliary power supply system, and is configured to, when the first communication status detection passes, close the circuit between the power conversion control chip and the internal auxiliary power supply system.

[0027] In an alternative embodiment of the present application, the control end of the auxiliary power control switch is connected to the main power chip startup control system or the central processing system.

[0028] In an alternative embodiment of the present application, the power supply control circuit further includes a grounding switch, one end of the grounding switch is connected to the grounding terminal of the power supply port, the other end is grounded, the grounding switch is controlled by the control unit, and is synchronously closed or turned off with the signal loop switch.

[0029] To achieve the above object and other related objects, the present application further provides a power supply device, and the power supply device adopts the power supply control circuit described in any one of the above.

[0030] To achieve the above object and other related objects, the present application further provides a power supply system, including:

[0031] A power supply device and a power receiving device;

[0032] The power supply device uses the power supply control circuit described in any one of the above to supply power to the power receiving device.

[0033] To achieve the above and other related objectives, the present application also provides a power supply control method applied to a power supply device, including:

[0034] Using an induction circuit unit to detect the access situation of an external device at the power supply port of the power supply device;

[0035] When the induction circuit unit detects that an external device is connected to the power supply port of the power supply device, close the signal loop switch to establish a signal loop with the external device;

[0036] Conduct the first communication status detection with the external device through the established signal loop;

[0037] When the first communication status detection passes, start the main circuit unit to supply power to the external device.

[0038] In an optional embodiment of the present application, when the first communication status detection passes, starting the main circuit unit to supply power to the external device includes:

[0039] When the first communication status detection passes, start the main circuit unit;

[0040] Conduct the second communication status detection with the external device again through the established signal loop;

[0041] When the second communication status detection passes, close the main circuit switch to supply power to the external device through the main circuit unit.

[0042] In an optional embodiment of the present application, when the first communication status detection fails or the second communication status detection fails, disconnect the signal loop switch and give an alarm.

[0043] In an optional embodiment of the present application, the induction circuit unit includes a Hall detection circuit and / or a metal detection circuit.

[0044] The power supply control circuit of the present application includes a control unit, an induction circuit unit, a signal loop switch, and a main circuit unit connected to the control unit. The induction circuit unit is used to detect whether an external device is connected to the power supply port of the power supply device. When it detects that an external device is connected to the power supply port of the power supply device, it generates and sends a start signal to the control unit. The control unit is used to close the signal loop switch based on the start signal to establish a signal loop with the external device, and perform the first communication status detection with the external device based on the established signal loop. When the first communication status detection passes, the main circuit unit is started to supply power to the external device. By introducing the induction circuit unit and the signal loop switch, when the power supply device is not connected to the external device, the terminals of the power supply port can be kept disconnected from the internal circuit, thereby not only improving the reliability and safety of the output of the power supply control circuit, but also reducing the standby power consumption of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The schematic diagram of the power supply system of the present application is shown.

[0046] Figure 2 The circuit schematic diagram of the power supply control circuit in a specific embodiment of the present application is shown.

[0047] Figure 3 The circuit schematic diagram of the power receiving device in a specific embodiment of the present application is shown.

[0048] Figure 4 The flow schematic diagram of the power supply control method in a specific embodiment of the present application is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0049] The following specific examples illustrate the embodiments of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present application.

[0050] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present application schematically. Therefore, only the components related to the present application are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0051] Such as Figures 1 - 3As shown in the figure, the present application discloses a power supply system, which includes a power supply device 100 and a power receiving device 200. Among them, the power supply device 100 has a power supply port 60 for supplying power to the outside and a power supply control circuit. The power supply port 60 includes a first power supply terminal 61, a first signal terminal 62, and a first common terminal 63; the power receiving device 200 is an external device, and a power receiving port 230 matching the power supply port 60 is provided thereon. Correspondingly, the power receiving port 230 includes a second power supply terminal 231, a second signal terminal 232, and a second common terminal 233. The power supply device 100 can supply power to the power receiving device 200 through the power supply control circuit. The power supply device 100 can be, for example, a charging station, a charging pile, a charger, an energy station, or other devices capable of supplying power to the outside. The power receiving device 200 can be, for example, a battery pack, or an electric tool such as a vacuum cleaner or a chain saw.

[0052] Figure 2 A power supply control circuit applied to the power supply device 100 is shown. The power supply control circuit includes an induction circuit unit 10, a control unit 20, signal loop switches S3, S4, and a main circuit unit 40. The control unit 20 is respectively connected to the induction circuit unit 10, the signal loop switches S3, S4, and the main circuit unit 40.

[0053] Among them, the induction circuit unit 10 is used to detect whether there is an external device connected to the power supply port 60. When it detects that there is an external device connected to the power supply port 60, it generates and sends a start signal to the central processing system 21 of the control unit 20; the central processing system 21 of the control unit 20 is used to close the signal loop switches S3, S4 as the first-level switches based on the start signal to establish a signal loop with the external device, and perform the first communication status detection with the external device based on the established signal loop to judge the external device connection situation and communication status. When the first communication status detection passes, it indicates that the external device is a power receiving device matching the power supply device 100 and the communication status is normal. At this time, the main circuit unit 40 is started by closing the auxiliary power control switch S1 and the optoelectronic switch S6 as the second-level switches, and after the main circuit unit 40 is started, the main circuit switch S2 as the third-level switch is closed to supply power to the external device. Through the stepped switch control logic, one layer of switches is confirmed and closed at a time until the relay serving as the main circuit switch S2 is closed after all signals are confirmed, thereby greatly increasing the safety factor of the power supply control system.

[0054] When the first communication status detection fails, it means that the external device is a device that does not match the power supply device 100 or other metal foreign matter, and the closed signal loop switches S3 and S4 are directly disconnected to cut off the connection between the first signal terminal 61 of the power supply port 60 and the internal circuit, and an error alarm message is issued. When the external device is removed from the power supply device 100, the alarm is lifted and the power supply device 100 enters the standby state, thereby avoiding the first signal terminal 61 exposed to the external environment of the device and being interfered by external signals, which may cause safety issues such as electric shock risks, equipment damage or fire, thereby improving the safety and reliability of the power supply system.

[0055] It should be noted that the first communication status detection is based on the communication protocol between the power supply device 100 and the powered device 200, and is performed according to the existing communication status detection method, so it will not be described in detail here. It should be noted that the number of signal loop switches in the power supply control circuit is determined according to the actual signal line, and each signal line can be provided with a signal loop switch. Figure 2 Only the case of two signal loop switches S3 and S4 is shown. The signals controlled by the signal loop switches S3 and S4 can be digital communication signals, external device voltage detection signals, or multiple composite mixed signals.

[0056] By introducing the sensing circuit unit 10 and the signal loop switches S3 and S4, when no external device is connected to the power supply port 60 of the power supply device 100, the terminals of the power supply port 60 can be kept disconnected from the internal circuit, thereby avoiding the risk of electric shock, equipment damage or fire caused by interference from external signals to the terminals exposed to the external environment of the device. This not only improves the reliability and safety of the power supply control circuit output, but also reduces the circuit standby power consumption.

[0057] In this embodiment, if Figure 2 and Figure 3 As shown, the sensing circuit unit 10 can adopt a Hall detection circuit 12 and a metal detection circuit 11. Accordingly, a Hall detection magnet that can be detected by the Hall detection circuit 12 and a metal detection block that can be detected by the metal detection circuit 11 need to be set in the matching powered device 200 as a target sensing object 220. The Hall detection circuit 12 senses whether an external device is connected to the power supply port 60 of the power supply device 100 by detecting the Hall detection magnet set at a preset position in the powered device; the metal detection circuit 11 senses whether an external device is connected to the power supply port 60 of the power supply device 100 by detecting the metal detection block set at a preset position in the external device.

[0058] The target induction object and the induction circuit unit 10 need to be set at appropriate positions convenient for accurate detection. For example, the induction circuit unit 10 can be set on the end face where the power supply port 60 of the power supply device 100 is located, and the target induction object 220 can be set on the end face of the power receiving device 200 where the power receiving port 230 is provided. It can be understood that in other embodiments, only the Hall detection circuit 12 or the metal detection circuit 11 can be set in the power supply device 100 as the induction circuit unit 10. Correspondingly, only the corresponding Hall detection magnet or metal detection block is set in the power receiving device 200 as the target induction object 220.

[0059] As Figure 2 shown, in this embodiment, the power supply control circuit is provided with a main circuit switch S2. The main circuit switch S2 is connected between the main circuit unit 40 and the first power supply terminal 62 of the power supply port 60, and is used to control the on / off of the circuit between the output end of the main circuit unit 40 and the first power supply terminal 62 of the power supply port 60. The main circuit switch S2 can be a relay, for example. When the first power supply terminal 62 is not connected to the power receiving device 200, the main circuit switch S2 is in the off state, so that the first power supply terminal 61 of the power supply port 60 is not charged, avoiding the risk of electric shock. When the first communication status detection passes, the control unit 20 can control the auxiliary power supply control switch S1 and the optoelectronic switch S6 to close to start the main circuit unit 40, and then close the main circuit switch S2 to supply power to the power receiving device 200 as an external device after the main circuit unit 40 is started.

[0060] In this embodiment, in order to further improve the safety of the power supply control circuit, after the first communication status detection passes and the control unit 20 starts the main circuit unit 40, the central processing system 21 of the control unit 20 also needs to perform a second communication status detection with the power receiving device 200 as an external device based on the established signal loop to judge the external device access situation and communication status again. Only when the second communication status detection passes, the main circuit switch S2 is closed to supply power to the power receiving device 200. When the second communication status detection fails, the previously closed signal loop switches S3 and S4 are also disconnected to cut off the connection between the first signal terminal 62 of the power supply port 60 and the internal circuit. At the same time, the auxiliary power supply control switch S1 and the optoelectronic switch S6 are also disconnected, so as to avoid safety problems such as electric shock risk, equipment damage or fire caused by external signal interference to the terminals exposed to the external environment of the power supply device, and improve the safety and reliability of the power supply system. It should be noted that the second communication status detection is based on the communication protocols of the power supply device 100 and the power receiving device 200, and is carried out according to the existing communication status detection method, so it will not be elaborated here.

[0061] In this embodiment, the power supply control circuit further includes a connection detection circuit 30. The central processing system 21 of the control unit 20 is sequentially connected to the communication terminal of the power supply port 60 through the connection detection circuit 30, signal loop switches S3 and S4. As a communication module, the connection detection circuit 30 is compatible with the communication and communication detection of different types of communication protocols, and is used to detect the communication status with external devices based on the established signal loop, and send the communication status detection result to the central processing system 21 of the control unit 20 for subsequent control logic. Of course, in some embodiments, the connection detection circuit 30 may not be provided, and the function of the connection detection circuit 30 may be directly implemented by the central processing system 21.

[0062] In a specific embodiment, the main circuit unit 40 includes a power conversion control chip 41 and a voltage conversion system 42. The power conversion control chip 41 is connected to the control unit 20, and the control unit 20 controls the operation of the power conversion control chip 41. The power conversion control chip 41 is used to monitor, adjust and control the input power supply, and control the operation of the voltage conversion system 42 to output a stable voltage required by the powered device 200. Specifically, various monitoring functions can be integrated in the power conversion control chip 41, such as input voltage monitoring, output voltage monitoring, current monitoring, etc. It controls the working state of the voltage conversion system 42 by monitoring the input and output voltages in real time and comparing them with preset standards. The power conversion control chip 41 is also responsible for connecting to the feedback loop of the voltage conversion system 42 to implement closed-loop control. By monitoring the output voltage, comparing the feedback signal with the reference voltage, and adjusting the operation of the voltage conversion system 42 as needed to maintain the stability and accuracy of the output voltage. The power conversion control chip 41 can also integrate various protection functions, such as overvoltage protection, overcurrent protection, over-temperature protection, etc. When an abnormal situation occurs in the voltage conversion system 42, the control chip can protect the safety of the system and equipment by means of controlling switches, adjusting the working frequency, etc.

[0063] In a specific embodiment, the control unit 20 includes a central processing system 21, an isolation switch control 22, an optoelectronic switch S6, a main power chip startup control system 23, and an auxiliary power control switch S1. The central processing system 21 is connected to the induction circuit unit 10 and is configured to close the signal loop switches S3 and S4 based on the startup signal to establish a signal loop with an external device and perform a first communication status detection with the external device based on the established signal loop. The input end of the isolation switch control 22 is connected to the induction circuit unit 10 or the central processing system 21, and the output end is connected to the input end of the main power chip startup control system 23 through the optoelectronic switch S6. The output end of the main power chip startup control system 23 is connected to the control end of the power conversion control chip 41. The isolation switch control 22 is configured to receive a control instruction issued by the induction circuit unit 10 when the first communication status detection passes, and control the main power chip startup control system 23 through the optoelectronic switch S6 to guide the power conversion control chip 41 to start the voltage conversion system 42, thereby completing the startup of the main circuit unit 40. The auxiliary power control switch S1 is connected between the power conversion control chip 41 and the internal auxiliary power supply system 50, and the control end of the auxiliary power control switch S1 is connected to the main power chip startup control system 23, that is, the auxiliary power control switch S1 is controlled by the main power chip startup control system 23. The auxiliary power control switch S1 is configured to close the circuit between the power conversion control chip 41 and the internal auxiliary power supply system 50 based on the control signal of the main power chip startup control system 23 when the first communication status detection passes.

[0064] It should be noted that in other embodiments, the isolation switch control 22 may also be connected to the central processing system 21. When the first communication status detection passes, the isolation switch control 22 directly receives the control instruction issued by the central processing system 21 and controls the main power chip startup control system 23 through the optoelectronic switch S6 according to the control instruction to guide the power conversion control chip 41 to start the voltage conversion system 42.

[0065] It should be noted that in other embodiments, the control end of the auxiliary power control switch S1 is connected to the central processing system 21. When the first communication status detection passes, the auxiliary power control switch S1 may also close the circuit between the power conversion control chip 41 and the internal auxiliary power supply system 50 through the control signal of the central processing system 21.

[0066] In an alternative embodiment of the present application, in order to effectively reduce circuit noise and interference, the power supply control circuit further includes a grounding switch S5. One end of the grounding switch S5 is connected to the first common terminal 63 of the power supply port 60, and the other end is grounded. The grounding switch S5 is controlled by the central processing system 21 of the control unit 20 and is closed or turned off synchronously with the signal loop switches S3 and S4. By setting the grounding switch S5, circuit noise and interference can be effectively reduced.

[0067] As Figure 4 shown, the present application also discloses a power supply control method for the above power supply control circuit, including the following steps:

[0068] Step S10, use the induction circuit unit 10 to detect the access situation of external devices at the power supply port 60 of the power supply device 100. The induction circuit unit 10 can be, for example, one or a combination of the Hall detection circuit 12 and the metal detection circuit 11. The Hall detection circuit 12 can determine whether an external device is connected to the power supply port 60 of the power supply device 100 by detecting a Hall detection magnet set at a preset position in the external device; the metal detection circuit 11 can determine whether an external device is connected to the power supply port 60 of the power supply device 100 by detecting a metal detection block set at a preset position in the external device.

[0069] Step S20, when the induction circuit unit 10 detects that an external device is connected to the power supply port 60 of the power supply device 100, close the signal loop switches S3 and S4 to establish a signal loop with the external device. When the induction circuit unit 10 detects that an external device is connected to the power supply port 60 of the power supply device 100, a start signal will be generated and sent to the central processing system 21 of the control unit 20. The central processing system 21 of the control unit 20 is used to close the signal loop switches S3 and S4 and the ground switch S5 based on the start signal to establish a signal loop with the external device. The signal loop is used for subsequent communication status detection and communication.

[0070] Steps S30 and S40, perform the first communication status detection with the external device through the established signal loop, and determine whether the first communication status detection passes. When the signal loop with the external device is established, at this time, the central processing system 21 of the control unit 20 also needs to attempt to communicate with the external device based on the constructed signal loop to determine whether the connected external device is a power receiving device 200 that matches the power supply device 100. If so, it means that the first communication status detection passes and enter step S50. If not, it means that the first communication status detection fails, and then enter step S60.

[0071] Step S50, when the first communication status detection passes, start the main circuit unit 40 to supply power to the external device. Specifically, when the first communication status detection passes, it means that the external device is a power receiving device 200 that matches the power supply device 100 and the communication status is normal. At this time, the control unit 20 can start the main circuit unit 40 to supply power to the external device by closing the auxiliary power control switch S1 and the optoelectronic switch S6.

[0072] Step S60: When the first communication status detection fails, disconnect signal loop switches S3 and S4 and give an alarm. Specifically, when the first communication status detection fails, it indicates that the external device is a device or object that does not match the power supply device 100. Then, the control unit 20 directly disconnects the already closed signal loop switches S3, S4, and grounding switch S5 to cut off the connection between the signal terminals of the power supply port 60 and the internal circuit, and sends an error alarm message.

[0073] In a specific embodiment, when the first communication status detection passes and the main circuit unit 40 is started, it is also necessary to perform a second communication status detection with the external device again through the established signal loop. When the second communication status detection passes, close the main circuit switch S2 to supply power to the external device through the main circuit unit 40. When the second communication status detection fails, it is also necessary to disconnect the signal loop switches S3, S4, grounding switch S5, auxiliary power control switch S1, and optoelectronic switch S6 and give an error alarm.

[0074] For the detailed control logic of the power supply control method, please refer to the description of the power supply control circuit part, which will not be elaborated here.

[0075] Next, it will be combined with Figure 2 to illustrate the working principle of the power supply control circuit:

[0076] When there is no connection outside the power supply device 100, all the switches in the switch system S1, S2, S3, S4, S5, S6 are in the off state. At this time, the metal detection circuit 11 and the Hall detection circuit 12 cannot detect any external device connected.

[0077] When an external device is connected to the power supply device 100, the metal detection circuit 11 and the Hall detection circuit 12 of the power supply device 100 will detect the corresponding signals, generate and send a start signal to the central processing system 21. The central processing system 21 will turn on the three switches S3, S4, and S5 inside and try to communicate with the connected external device. If the external device gives an information feedback at this time and the power supply device 100 confirms that there is no abnormality in the information feedback of the external device, it means that the external device is a normal power receiving device 200. Then, close the switch S1. At the same time, the disconnector control 22 sends a signal to the optoelectronic switch S6, and the optoelectronic switch S6 controls the main power chip to start the control system 23 to guide the power conversion control chip 41 to start the voltage conversion system 42, thus completing the start of the main circuit unit 40. After the main circuit unit 40 is started, it simultaneously detects the access situation and communication status of the external device. If everything is normal, the power supply device 100 will close the last switch S2 to supply power to the external device.

[0078] In abnormal circumstances, if the power supply device 100 is not connected to a normal device or other metal foreign objects, the system will also follow the procedure of turning on switches S3, S4, and S5, and then try to communicate with the external device. If the system receives an incorrect message or does not receive any message, the power supply device 100 will forcibly disconnect the closed switches S3, S4, and S5, and issue an error alarm indication. After the external device is removed from the power supply device 100, the alarm is lifted, and the system of the power supply device 100 enters standby mode.

[0079] In summary, the power supply control circuit of the present application includes a sensing circuit unit, a control unit, a signal loop switch and a main circuit unit, and the control unit is respectively connected to the sensing circuit unit, the signal loop switch and the main circuit unit; the sensing circuit unit is used to detect whether an external device is connected to the power supply port of the power supply device, and when it is detected that an external device is connected to the power supply port of the power supply device, a start signal is generated and sent to the control unit; the control unit is used to close the signal loop switch based on the start signal to establish a signal loop with the external device, and perform a first communication status detection with the external device based on the established signal loop, and when the first communication status detection passes, the main circuit unit is started to supply power to the external device. By introducing the sensing circuit unit and the signal loop switch, when the power supply device is not connected to the external device, each terminal of the power supply port can be kept in a disconnected state from the internal circuit, thereby not only improving the reliability and safety of the output of the power supply control circuit, but also reducing the standby power consumption of the circuit.

[0080] The power supply control circuit of the present application can also improve the reliability of connections between devices, avoid system false connection caused by improper connection during operation, and thus reduce the risk of equipment use caused by high contact resistance and high heat after system false connection.

[0081] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application.

[0082] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A power supply control circuit applied to a power supply device, characterized in that, Comprising: A control unit, and an induction circuit unit, a signal loop switch, and a main circuit unit connected to the control unit; The induction circuit unit is used to detect whether an external device is connected to the power supply port of the power supply device. When it detects that an external device is connected to the power supply port of the power supply device, it generates and sends a start signal to the control unit; The control unit is used to close the signal loop switch based on the start signal to establish a signal loop with the external device, and perform a first communication status detection with the external device based on the established signal loop. When the first communication status detection passes, it starts the main circuit unit to supply power to the external device.

2. The power supply control circuit according to claim 1, wherein The induction circuit unit includes a Hall detection circuit and / or a metal detection circuit; The Hall detection circuit senses whether an external device is connected to the power supply port of the power supply device by detecting a Hall detection magnet set at a preset position in the external device; The metal detection circuit senses whether an external device is connected to the power supply port of the power supply device by detecting a metal detection block set at a preset position in the external device.

3. The power supply control circuit according to claim 1, wherein The power supply control circuit further includes a main circuit switch, and the main circuit switch is connected between the main circuit unit and the power supply terminal of the power supply port; When the first communication status detection passes, the control unit starts the main circuit unit and closes the main circuit switch to supply power to the external device.

4. The power supply control circuit according to claim 3, wherein When the first communication status detection passes, the control unit starts the main circuit unit and performs a second communication status detection with the external device based on the established signal loop. After the second communication status detection passes, it closes the main circuit switch to supply power to the external device.

5. The power supply control circuit according to claim 4, wherein the control unit is further used to disconnect the signal loop switch when the first communication status detection fails or the second communication status detection fails, so as to disconnect the signal loop with the external device.

6. The power supply control circuit according to claim 1, wherein The main circuit unit includes a power conversion control chip and a voltage conversion system, and the power conversion control chip is connected to the control unit; The control unit is used to control the operation of the power conversion control chip; The power conversion control chip control unit is used to monitor, adjust, and control the input power supply, and control the operation of the voltage conversion system to output a stable voltage required by the external device.

7. The power supply control circuit according to claim 6, wherein The control unit includes a central processing system, an isolation switch control, an optoelectronic switch, a main power chip startup control system, and an auxiliary power control switch; The central processing system is connected to the induction circuit unit, and is used to close the signal loop switch based on the start signal to establish a signal loop with the external device, and perform a first communication status detection with the external device based on the established signal loop; The input end of the isolation switch control is connected to the induction circuit unit or the central processing system, and the output end is connected to the input end of the main power chip startup control system through the optoelectronic switch; The output end of the main power supply chip startup control system is connected to the control end of the power conversion control chip; The isolation switch control is used to, when the first communication status detection passes, control the main power supply chip startup control system through the optoelectronic switch to guide the power conversion control chip to start the voltage conversion system; The auxiliary power control switch is connected between the power conversion control chip and the internal auxiliary power supply system, and is used to close the circuit between the power conversion control chip and the internal auxiliary power supply system when the first communication status detection passes.

8. The power supply control circuit according to claim 7, characterized in that, The control end of the auxiliary power control switch is connected to the main power supply chip startup control system or the central processing system.

9. The power supply control circuit according to claim 1, wherein The power supply control circuit further includes a grounding switch. One end of the grounding switch is connected to the grounding terminal of the power supply port, and the other end is grounded. The grounding switch is controlled by the control unit and is synchronously closed or turned off with the signal loop switch.

10. The power supply control circuit according to claim 1, wherein It further includes a connection detection circuit. The control unit is sequentially connected to the communication terminal of the power supply port through the connection detection circuit and the signal loop switch; The connection detection circuit is used to perform communication status detection with the external device based on the established signal loop, and send the communication status detection result to the control unit when.

11. A power supply device, characterized in that, The power supply device adopts the power supply control circuit as described in any one of claims 1-10.

12. A power supply system, characterized in that, Including: A power supply device and a power receiving device; The power supply device adopts the power supply control circuit as described in any one of claims 1-10 to supply power to the power receiving device.

13. A power supply control method applied to a power supply device, characterized in that, Including: Using an induction circuit unit to detect the access situation of an external device at the power supply port of the power supply device; When the induction circuit unit detects that an external device is connected to the power supply port of the power supply device, close the signal loop switch to establish a signal loop with the external device; Perform the first communication status detection with the external device through the established signal loop; When the first communication status detection passes, start the main circuit unit to supply power to the external device.

14. The power supply control method according to claim 13, characterized in that, When the first communication status detection passes, start the main circuit unit to supply power to the external device, including: When the first communication status detection passes, start the main circuit unit; Perform the second communication status detection with the external device again through the established signal loop; When the second communication status detection passes, close the main circuit switch to supply power to the external device through the main circuit unit.

15. The power supply control method according to claim 14, wherein When the first communication status detection fails or the second communication status detection fails, disconnect the signal loop switch and give an alarm.

16. The power supply control method according to claim 13, characterized in that, The induction circuit unit includes a Hall detection circuit and / or a metal detection circuit.

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