Charging system using charging contact for communication authentication

Abstract

The utility model provides a charging system using a charging contact for communication authentication, which comprises a charging base circuit and a terminal circuit, the charging base circuit is connected with the terminal circuit through the charging contact, and the charging system is suitable for household intelligent equipment with an automatic charging management function. The charging base circuit comprises an MCU, a DC-DC power supply circuit, a single-line communication circuit, a power switch circuit, an indicating lamp and a voltage acquisition circuit. The terminal circuit comprises an MCU, a single-line communication circuit, a power switch circuit, a voltage acquisition circuit and an RS485 communication circuit. Power signal multiplexing is achieved through the positive and negative electrodes of the charging contacts of the charging base and the power utilization terminal, communication authentication of the charging base and the power utilization terminal is achieved, and the safety of the charging process of the intelligent equipment and the visibility of charging information are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of intelligent device charging, in particular to a charging system using charging contacts for communication authentication. BACKGROUND

[0002] With the wide application of intelligent devices, household and commercial automation devices are increasingly widely used, and the automatic docking and charging technology between the charging base and the device is becoming more and more critical. However, the existing charging system still has some deficiencies, especially in terms of safety and information feedback. For household devices such as floor cleaning robots and robotic dogs, although they can automatically return to the charging base for charging, most systems only achieve basic power transmission and lack communication functions, which limits the intelligent management and safety of the devices. For commercial devices such as warehouse robots and delivery robots, although they also rely on similar charging methods, in high-end devices, most still do not achieve device authentication or detailed charging status feedback.

[0003] The above-mentioned traditional charging method usually lacks effective communication and authentication mechanism, and the charging base cannot accurately identify the connected device, which may cause unauthorized devices to access and cause potential battery damage or device failure. In addition, the existing charging technology cannot obtain and feedback the charging status information of the device such as charging time, battery remaining capacity, etc. after charging is completed, resulting in the user's lack of understanding of the battery health status of the device, thereby affecting the long-term service life of the device.

[0004] In order to improve the safety of the charging process of intelligent devices and the visibility of charging information, a device communication and authentication scheme before and after charging is urgently needed. Therefore, it is necessary to propose a charging system that can perform communication authentication. SUMMARY

[0005] Based on the above technical background problems, the present application provides a charging system using charging contacts for communication authentication, which includes a charging base circuit and a terminal circuit. The charging base circuit is connected to the terminal circuit through the charging contacts, and is suitable for household intelligent devices with automatic charging management function. The charging base and the terminal are authenticated through the power signal multiplexing of the positive and negative poles of the charging contacts. The charging base circuit includes an MCU, a DC-DC power supply circuit, a single-wire communication circuit, a power switch circuit, an indicator light and a voltage acquisition circuit. The terminal circuit includes an MCU, a single-wire communication circuit, a power switch circuit, a voltage acquisition circuit and an RS485 communication circuit.

[0006] The charging base circuit is located on one side of the charging base, connected with the terminal circuit through the charging contact, comprising a first MCU, a first DC-DC power supply circuit, a first single-wire communication circuit, a first power switch circuit, an indicator lamp, a first voltage acquisition circuit and a base side charging contact. The external AC-DC circuit converts 220V alternating current into direct current and then reduces the voltage to generate Vdc; the input end of the charging base circuit is connected with Vdc, and the output end is the base side charging contact.

[0007] The input end of the first DC-DC power supply circuit is connected with Vdc, and Vdc is reduced to Vcc to supply power to the first MCU.

[0008] The first power switch circuit controls the on-off of the charging loop on one side of the charging base, disconnects Vdc during communication and after charging, and connects Vdc during charging, comprising a first solid-state relay controller with protection and a first back-to-back MOS tube with bidirectional blocking, which constitute a complete solid-state relay function, the enable signal one output by the first MCU is used as the input of the first solid-state relay controller to control the on-off of the charging loop on one side of the charging base, and the output is the charging voltage Vcharge connected to the base side charging contact.

[0009] The first single-wire communication circuit controls the on-off of the communication loop on one side of the charging base, disconnects the communication loop during charging, and comprises a first solid-state relay and a first communication circuit; the first solid-state relay is controlled by the enable signal two output by the first MCU.

[0010] The indicator lamp comprises a power indicator lamp and a charging indicator lamp, the power indicator lamp prompts the on-off of Vdc, and the charging indicator lamp prompts the on-off of the charging loop on one side of the charging base.

[0011] The first voltage acquisition circuit monitors the charging voltage on one side of the charging base, i.e. the output voltage of the first power switch circuit, and the detected voltage is connected to the ADC pin of the first MCU to prevent the first single-wire communication circuit from being accidentally turned on during charging.

[0012] The first MCU processes the collected data and generates control signals to realize the communication function.

[0013] Preferably, the charging loop in the charging base circuit has the sequence of Vdc, the first power switch circuit and the base side charging contact from input to output, which is a one-way charging; the communication loop is composed of the first MCU, the first single-wire communication circuit and the base side charging contact, which is a two-way communication.

[0014] The terminal circuit is located at the side of the power terminal, and is connected with the charging base circuit through the charging contact to charge the power battery pack in the power terminal, and comprises a second MCU, a second DC-DC power supply circuit, a second single-wire communication circuit, a second power switch circuit, a second voltage acquisition circuit, an RS485 communication circuit and a terminal-side charging contact. The power terminal comprises a power battery pack and a battery management system. The input end of the terminal circuit is connected with the terminal-side charging contact, and the output end is connected with the power battery pack Vbat.

[0015] The input end of the second DC-DC power supply circuit is connected with Vbat, and Vbat is reduced to Vcc to supply power to the second MCU.

[0016] The second power switch circuit controls the on-off of the charging loop at the side of the power terminal, and disconnects Vbat when communicating and after charging is completed, and connects Vbat when charging, and comprises a second solid-state relay controller with protection and a second bidirectional blocking back-to-back MOS tube. The second solid-state relay controller and the second bidirectional blocking back-to-back MOS tube constitute a complete solid-state relay function. The enable signal three output by the second MCU is taken as the input of the second solid-state relay controller to control the on-off of the charging loop at the side of the power terminal, and the output is the charging voltage Vbat connected to the power battery pack.

[0017] The second single-wire communication circuit controls the on-off of the communication loop at the side of the power terminal, and disconnects the communication loop when charging, and comprises a second solid-state relay and a second communication circuit. The second solid-state relay is controlled to be on-off by the enable signal four output by the second MCU.

[0018] The second voltage acquisition circuit detects the charging voltage, that is, the voltage of the terminal-side charging contact, and the detected voltage is connected to the ADC pin of the second MCU to prevent the second single-wire communication circuit from being accidentally turned on during charging.

[0019] The second MCU processes the collected data and generates control signals to realize the communication function.

[0020] One end of the RS485 communication circuit is connected with the second MCU, and the other end is connected with the battery management system to realize half-duplex communication between the two.

[0021] Preferably, the charging loop in the terminal circuit has the input-to-output sequence of the terminal-side charging contact, the second power switch circuit and Vbat in order, and is a one-way charging loop; and the communication loop is composed of the battery management system, the second MCU, the second single-wire communication circuit and the terminal-side charging contact, and is a two-way communication loop.

[0022] The application discloses a charging system using charging contacts to perform communication authentication, power signal multiplexing is realized through positive and negative charging contacts of a charging base and a terminal, communication authentication of the charging base and the terminal is realized, and the safety of a smart device charging process and the visibility of charging information are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and therefore should not be considered as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0024] Figure 1 An electrical connection block diagram of the charging system using charging contacts to perform communication authentication according to the application;

[0025] Figure 2 An electrical connection block diagram of the charging base circuit of the charging system using charging contacts to perform communication authentication according to the application;

[0026] Figure 3 A schematic diagram of the first power switch circuit in the charging base circuit according to the application;

[0027] Figure 4 A schematic diagram of the first single-wire communication circuit in the charging base circuit according to the application;

[0028] Figure 5 A schematic diagram of the first MCU, the indicator light and the first voltage acquisition circuit in the charging base circuit according to the application;

[0029] Figure 6 An electrical connection block diagram of the terminal circuit of the charging system using charging contacts to perform communication authentication according to the application;

[0030] Figure 7 A schematic diagram of the second power switch circuit in the terminal circuit according to the application;

[0031] Figure 8 A schematic diagram of the second single-wire communication circuit in the terminal circuit according to the application;

[0032] Figure 9 A schematic diagram of the second MCU, the RS485 communication circuit and the second voltage acquisition circuit in the terminal circuit according to the application;

[0033] Numbering in the figure:

[0034] 10: charging base circuit; 20: terminal circuit; 30: charging contact; P2: base side charging contact; P3: terminal side charging contact;

[0035] 101: first MCU; 102: first DC-DC power supply circuit; 103: first single-wire communication circuit; 104: first power switch circuit; 105: indicator light;

[0036] 106: first voltage acquisition circuit; U1: first solid-state relay controller with protection; K1: first solid-state relay; 1031: first communication circuit;

[0037] Q1, Q2: first back-to-back MOS tube with bidirectional blocking;

[0038] 201: second MCU; 202: second single-wire communication circuit; 203: second power switch circuit; 204: second voltage acquisition circuit; 205: RS485 communication circuit;

[0039] 206: second DC-DC power supply circuit; U2: second solid-state relay controller with protection; K2: second solid-state relay; 2021: second communication circuit;

[0040] Q3, Q4: second back-to-back MOS tube with bidirectional blocking. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application.

[0042] Please refer to Figure 1 An electrical connection block diagram of a charging system using charging contacts for communication authentication described in the present application includes a charging base circuit 10 and a terminal circuit 20, and the charging base circuit 10 is connected to the terminal circuit 20 through charging contacts 30. An AC-DC circuit converts 220V alternating current to direct current and then reduces the voltage to generate Vdc; the input end of the charging base circuit 10 is connected to Vdc, and the output end is the 10-side charging contact. The power terminal includes a power battery pack and a battery management system, and the input end of the terminal circuit 20 is connected to the 20-side charging contact, and the output end is connected to the power battery pack.

[0043] Please refer toFigure 2 The electrical connection block diagram of the charging base circuit of the charging system for communication authentication using charging contacts according to the application comprises a first MCU (101), a first DC-DC power supply circuit (102), a first single-wire communication circuit (103), a first power switch circuit (104), an indicator light (105), a first voltage acquisition circuit (106), and a base-side charging contact P2. The external AC-DC circuit converts 220V alternating current into direct current and then reduces the voltage to generate Vdc; the input end of the DC-DC power supply circuit (102) is connected to Vdc, and Vdc is reduced to Vcc to power the first MCU (101); the first power switch circuit (104) controls the on-off of the charging voltage and the base-side charging contact P2 under the command output by the first MCU (101); the first single-wire communication circuit (103) controls the on-off of the communication signal and the base-side charging contact P2 under the command issued by the first MCU (101); the indicator light (105) prompts the on-off of Vdc and the on-off of the charging loop on the charging base side. The first voltage acquisition circuit (106) monitors the charging voltage, that is, the output voltage of the first power switch circuit (104), and the detected voltage is connected to the ADC pin of the first MCU (101).

[0044] Please refer to Figure 3 The schematic diagram of the first power switch circuit in the charging base circuit according to the application comprises a first solid-state relay controller (U1) with protection and a first back-to-back MOS tube (Q1, Q2) with bidirectional blocking. The first solid-state relay controller (U1) and the first back-to-back MOS tube (Q1, Q2) with bidirectional blocking constitute a complete solid-state relay function, the enable signal EN is input to the first solid-state relay controller (U1), controls the on-off of the charging loop on the charging base side, and the output is the charging voltage Vcharge, which is connected to the base-side charging contact P2. P1 is connected Figure 2 to the output Vdc of the AC-DC circuit.

[0045] Please refer to Figure 4 The schematic diagram of the first single-wire communication circuit in the charging base circuit according to the application comprises a first solid-state relay (K1) and a first communication circuit (1031). The first solid-state relay (K1) is controlled by the enable signal two (COM EN) issued by the first MCU (101) shown in Figure 2 ; the first communication circuit (1031) communicates with the first MCU (101) shown in Figure 2 through UART RX and UART TX.

[0046] Please refer to Figure 5The schematic diagram of the first MCU, the indicator light and the first voltage acquisition circuit in the charging base circuit of the application, comprising the first MCU (101), the indicator light 105 and the first voltage acquisition circuit (106). The indicator light 105 comprises the power indicator light POWER and the charging indicator light CHARGE, the power indicator light POWER prompting the on-off of Vdc, and the charging indicator light CHARGE prompting the on-off of the charging circuit on the side of the charging base. The first voltage acquisition circuit (106) monitors the charging voltage on the side of the charging base, i.e. Figure 3 The output voltage Vcharge of the first power switch circuit and the simultaneously detected voltage Vadc are connected to the ADC pin (Vadc) of the first MCU.

[0047] Please refer to Figure 6 The electrical connection block diagram of the terminal circuit of the charging system using the charging contact for communication authentication, comprising the second MCU (201), the second single-wire communication circuit (202), the second power switch circuit (203), the second voltage acquisition circuit (204), the RS485 second communication circuit 05, the second DC-DC power supply circuit (206) and the terminal-side charging contact P3. The terminal-side charging contact P3 is connected Figure 2 The charging-side charging contact P2, the input end of the second DC-DC power supply circuit (206) is connected with Vdc, the Vdc is reduced to Vcc to supply power to the second MCU (201); the second power switch circuit (203) controls the on-off of the charging voltage and the terminal-side charging contact P3 under the command output by the second MCU (201); the second single-wire communication circuit (202) controls the on-off of the communication signal and the terminal-side charging contact P3 under the command issued by the second MCU (201). The second voltage acquisition circuit (204) monitors the charging voltage, and the simultaneously detected voltage is connected to the ADC pin (Vadc2) of the second MCU (201).

[0048] Please refer to Figure 7 The schematic diagram of the second power switch circuit (203) in the terminal circuit of the application, comprising the second solid-state relay controller (U5) with protection and the second bidirectional blocking back-to-back MOS tube (Q7, Q8). The first solid-state relay controller (U5) and the second bidirectional blocking back-to-back MOS tube (Q7, Q8) constitute a complete solid-state relay function, the enable signal three EN is taken as the input of the second solid-state relay controller (U5), controls the on-off of the charging circuit on the side of the terminal, and the output is the charging voltage Vbat, which is connected to the power battery pack through P4. P3 is connected Figure 6 The terminal-side charging contact.

[0049] Please refer to Figure 8The schematic diagram of the second single-wire communication circuit (202) in the terminal circuit of the application, comprising a second solid-state relay (K2) and a second communication circuit (2021). The second solid-state relay (K2) is controlled by the enable signal four (COM EN) from the second MCU (201) shown in Figure 6 to turn on and off; the second communication circuit (2021) communicates with the second MCU (201) shown in Figure 6 by UART RX and UART TX.

[0050] Please refer to Figure 9 The schematic diagram of the second MCU, RS485 communication circuit and second voltage acquisition circuit in the terminal circuit of the application, comprising a second MCU (201), RS485 second communication circuit 05 and a second voltage acquisition circuit (204). The second voltage acquisition circuit (204) monitors the charging voltage on the terminal side, and the detected voltage Vcharge is connected to the ADC pin of the second MCU. One end of the RS485 second communication circuit 05 is connected to the second MCU (201), and the other end is connected to the battery management system of the external power battery pack. The second voltage acquisition circuit (204) detects the voltage of the charging contact on the terminal side, and the detected voltage is connected to the ADC pin of the second MCU (201). Figure 6

[0051] The above is only an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.​

Claims

1. A charging system that uses charging contacts for communication authentication, characterized in that, It includes a charging base circuit and a terminal circuit. The charging base circuit is connected to the terminal circuit through charging contacts. The charging base circuit includes an MCU, a DC-DC power supply circuit, a single-wire communication circuit, a power switch circuit, an indicator light, and a voltage acquisition circuit. The terminal circuit includes an MCU, a single-wire communication circuit, a power switch circuit, a voltage acquisition circuit, and an RS485 communication circuit. The charging base circuit is located on one side of the charging base and is connected to the terminal circuit through charging contacts. It includes a first MCU, a first DC-DC power supply circuit, a first single-wire communication circuit, a first power switch circuit, an indicator light, a first voltage acquisition circuit, and charging contacts on the base side. An external AC-DC circuit converts 220V AC power to DC power and then steps it down to generate Vdc. The input terminal of the charging base circuit is connected to Vdc, and the output terminal is the charging contacts on the base side. The input terminal of the DC-DC power supply circuit is connected to Vdc, which steps down Vdc to Vcc to supply power to the first MCU. The first power switch circuit controls the on / off state of the charging circuit on one side of the charging base. It includes a first solid-state relay controller with protection and a first back-to-back MOSFET with bidirectional blocking. The first solid-state relay controller and the first back-to-back MOSFET with bidirectional blocking constitute a complete solid-state relay function. The enable signal output by the first MCU is used as the input of the first solid-state relay controller to control the on / off state of the charging circuit on one side of the charging base. The output is the charging voltage Vcharge, which is connected to the charging contacts on the base side. The first single-wire communication circuit controls the on / off state of the communication circuit on one side of the charging base, including a first solid-state relay and a first communication circuit; the first solid-state relay is controlled by an enable signal 2 issued by the first MCU. The indicator lights include a power indicator light and a charging indicator light. The power indicator light indicates whether Vdc is on or off, and the charging indicator light indicates whether the charging circuit on one side of the charging base is on or off. The first voltage acquisition circuit monitors the charging voltage on one side of the charging base, which is the output voltage of the first power switch circuit, and the detected voltage is connected to the ADC pin of the first MCU. The first MCU processes the acquired data and generates control signals to achieve communication functions; The terminal circuit is located on the side of the power consumption terminal and is connected to the charging base circuit through charging contacts. It includes a second MCU, a second DC-DC power supply circuit, a second single-wire communication circuit, a second power switch circuit, a second voltage acquisition circuit, an RS485 communication circuit, and terminal-side charging contacts. The power consumption terminal includes a power battery pack and a battery management system. The input end of the terminal circuit is connected to the terminal-side charging contacts, and the output end is connected to the power battery pack Vbat. The input terminal of the second DC-DC power supply circuit is connected to Vbat, which steps down Vbat to Vcc to supply power to the second MCU; The second power switch circuit controls the on / off state of the charging circuit on the power terminal side, including a second solid-state relay controller with protection and a second bidirectional blocking back-to-back MOS transistor. The second solid-state relay controller and the second bidirectional blocking back-to-back MOS transistor constitute a complete solid-state relay function. The enable signal 3 output by the second MCU serves as the input of the second solid-state relay controller, controlling the on / off state of the charging circuit on the power terminal side. The output is the charging voltage Vbat, which is connected to the power battery pack. The second single-wire communication circuit controls the on / off state of the communication circuit on one side of the power terminal, including the second solid-state relay and the second communication circuit; the second solid-state relay is controlled by the enable signal 4 issued by the second MCU. The second voltage acquisition circuit detects the charging voltage, that is, the voltage of the charging contact on the terminal side, and the detected voltage is connected to the ADC pin of the second MCU. The second MCU processes the acquired data and generates control signals to realize communication functions; One end of the RS485 communication circuit is connected to the second MCU, and the other end is connected to the battery management system.

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