A mobile device

Abstract

This invention discloses a mobile device. The mobile device includes: an external expansion interface, a switch selection module, a first signal processing module, a control module, a second signal processing module, a safety module, and a wheel braking module. The external expansion interface, the first signal processing module, and the second signal processing module are all connected to the switch selection module. The first signal processing module is connected to the control module. The control module and the second signal processing module are respectively connected to the safety module. The safety module is connected to the wheel braking module. The safety module supplies power to the wheel braking module, enabling the wheel braking module to control the movement of the mobile device. The technical solution of this invention ensures that the mobile device can only move when the charging cable is fully retracted.

Description

Technical Field

[0001] This invention relates to the field of mobile device technology, and more particularly to a mobile device. Background Technology

[0002] With the development of technology, many previously fixed devices have become mobile. They are powered by lithium batteries, have a smaller size, and can be charged by connecting to the mains power.

[0003] However, existing mobile devices have the following two shortcomings.

[0004] 1. There is no safety mechanism to determine whether the charging cable is still connected to the socket. Moving movable devices while the cable is connected to the socket could cause safety issues. (Existing technology only detects the presence of mains voltage; this mechanism fails when the charging cable is connected to the socket but the socket is not powered.)

[0005] 2. Without a safety check to ensure that the charging cable is properly stored, safety issues can easily arise if the cable is not properly stored when moving the device. Summary of the Invention

[0006] This invention provides a mobile device that can only be moved when the charging cable is fully retracted and the charging plug is plugged into the external expansion interface of the mobile device.

[0007] According to one aspect of the present invention, a mobile device is provided, comprising: an external expansion interface, a switch selection module, a first signal processing module, a control module, a second signal processing module, a safety module, and a wheel braking module. The external expansion interface, the first signal processing module, and the second signal processing module are all connected to the switch selection module. The first signal processing module is connected to the control module. The control module and the second signal processing module are respectively connected to the safety module. The safety module is connected to the wheel braking module.

[0008] The control module is configured to send a first control command to the switch selection module if the output signal of the first signal processing module is detected, so as to connect the external expansion interface to the mains power; and to send a second control command to the switch selection module if the output signal of the first signal processing module is not detected, so as to connect the external expansion interface to the second signal processing module.

[0009] The safety module is used to supply power to the wheel braking module when it receives a first control signal sent by the control module and a second control signal sent by the second signal processing module, so that the wheel braking module controls the movement of the mobile device.

[0010] Furthermore, the first signal processing module includes: a signal demodulation unit, a power filter, and an AC-DC conversion unit. The switch selection module is connected to the signal demodulation unit, the signal demodulation unit is connected to the power filter, the power filter is connected to the AC-DC conversion unit, and the AC-DC conversion unit is connected to the control module.

[0011] Furthermore, the second signal processing module includes a signal modulation unit and a signal conversion unit. The switch selection module is connected to the signal modulation unit, and both the signal modulation unit and the signal demodulation unit are connected to the signal conversion unit. The signal conversion unit is also connected to the safety module.

[0012] Furthermore, the signal modulation unit includes: a current source, a first resistor, a first signal acquisition and processing subunit, and a first relay. The current source is connected to the first resistor, the first resistor is connected to the first signal acquisition and processing subunit, the first signal acquisition and processing subunit is connected to the first relay, and the first relay is connected to the signal conversion unit.

[0013] The first signal acquisition and processing subunit is used to acquire the voltage across the first resistor, and when the voltage across the first resistor is greater than a threshold, it controls the first relay to output dry contacts.

[0014] The first relay is used to output dry contacts to the signal conversion unit;

[0015] The current source is used to generate a modulated current waveform at a preset frequency.

[0016] Furthermore, the signal modulation unit further includes a signal synchronization subunit, the current source is connected to the signal synchronization subunit, the signal synchronization subunit is connected to the first resistor, and the signal synchronization subunit is used to control the signals of the L line and N line to be in phase and frequency.

[0017] Furthermore, the signal modulation unit further includes a second resistor, which is connected to the first signal acquisition and processing subunit and the current source respectively, wherein the first resistor is the acquisition resistor for the L line and the second resistor is the acquisition resistor for the N line.

[0018] Furthermore, the signal demodulation unit includes: a second signal acquisition and processing subunit, a third resistor, and a second relay. The current source is connected to the third resistor, the third resistor is connected to the second signal acquisition and processing subunit, the second signal acquisition and processing subunit is connected to the second relay, and the second relay is connected to the signal conversion unit. The third resistor is the acquisition resistor of the ground wire.

[0019] Furthermore, the switch selection module is used to connect the signal demodulation unit and the signal modulation unit when the charging cable is connected to the external expansion interface.

[0020] Furthermore, the mobile device also includes a battery power supply module and a DC-DC conversion module, wherein the battery power supply module is connected to the DC-DC conversion module and the wheel braking module respectively, and the DC-DC conversion module is connected to the safety module.

[0021] Furthermore, the switch selection module includes three sets of relay switches.

[0022] This invention discloses a mobile device. The mobile device includes: an external expansion interface, a switch selection module, a first signal processing module, a control module, a second signal processing module, a safety module, and a wheel braking module. The external expansion interface, the first signal processing module, and the second signal processing module are all connected to the switch selection module. The first signal processing module is connected to the control module. The control module and the second signal processing module are respectively connected to the safety module. The safety module is connected to the wheel braking module. The safety module supplies power to the wheel braking module upon receiving a first control signal from the control module and a second control signal from the second signal processing module, thereby enabling the wheel braking module to control the movement of the mobile device. This invention ensures that the mobile device can only move when the charging cable is fully retracted and the charging plug is plugged into the external expansion interface.

[0023] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a mobile device according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the charging cable connection of a mobile device in an embodiment of the present invention;

[0027] Figure 3 This is a functional block diagram of a mobile device connected to mains power in an embodiment of the present invention;

[0028] Figure 4 This is a functional block diagram of a mobile device not connected to mains power in an embodiment of the present invention;

[0029] Figure 5 This is a structural block diagram of the switch selection module in this embodiment of the invention connecting the external expansion interface to the mains power.

[0030] Figure 6 This is a block diagram of the switch selection module in this embodiment of the invention, which connects the external expansion interface to the signal modulation unit.

[0031] Figure 7 This is a circuit block diagram of the signal modulation unit and the signal demodulation unit in an embodiment of the present invention;

[0032] Figure 8 This is a structural block diagram of the security and module in an embodiment of the present invention. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] It is understood that before using the technical solutions disclosed in the various embodiments of this disclosure, users should be informed of the types, scope of use, and usage scenarios of the personal information involved in this disclosure in an appropriate manner in accordance with relevant laws and regulations, and user authorization should be obtained.

[0036] Example 1

[0037] Figure 1 This is a schematic diagram of the structure of a mobile device provided in an embodiment of the present invention. The mobile device specifically includes: an external expansion interface 110, a switch selection module 120, a first signal processing module 130, a control module 140, a second signal processing module 150, a safety module 160, and a wheel braking module 170.

[0038] The external expansion interface, the first signal processing module, and the second signal processing module are all connected to the switch selection module. The first signal processing module is connected to the control module. The control module and the second signal processing module are respectively connected to the safety module. The safety module is connected to the wheel braking module.

[0039] The control module is configured to send a first control command to the switch selection module if the output signal of the first signal processing module is detected, so as to connect the external expansion interface to the mains power; and to send a second control command to the switch selection module if the output signal of the first signal processing module is not detected, so as to connect the external expansion interface to the second signal processing module.

[0040] The safety module is used to supply power to the wheel braking module when it receives a first control signal sent by the control module and a second control signal sent by the second signal processing module, so that the wheel braking module controls the movement of the mobile device.

[0041] The mobile device can be a mobile stamp cart or other devices that require charging.

[0042] The first control signal sent by the control module is a signal for controlling the movement of the mobile device, and the second control signal is a signal for controlling the movement of the mobile device.

[0043] The wheel braking module is used to control the movement of the wheels of the mobile device after receiving a power supply signal.

[0044] It should be noted that, as Figure 2 As shown, Figure 2 The diagram on the left shows a schematic of a charging cable connection socket for a mobile device. Figure 2 In the scenario shown on the left, the mobile device cannot move. Figure 2 The illustration on the right shows the charging cable of the mobile vehicle fully stowed away and the charging plug plugged into the external expansion port of the mobile device. Figure 2 In the scenario illustrated on the right, the movable vehicle can be moved.

[0045] Optionally, the first signal processing module includes: a signal demodulation unit, a power filter, and an AC-DC conversion unit. The switch selection module is connected to the signal demodulation unit, the signal demodulation unit is connected to the power filter, the power filter is connected to the AC-DC conversion unit, and the AC-DC conversion unit is connected to the control module.

[0046] Optionally, the second signal processing module includes a signal modulation unit and a signal conversion unit. The switch selection module is connected to the signal modulation unit, and both the signal modulation unit and the signal demodulation unit are connected to the signal conversion unit. The signal conversion unit is also connected to the safety module.

[0047] like Figure 3 The diagram shows the functional block diagram when the mobile device is connected to AC power. The charging cable connects to AC power, and the control module identifies this connection by acquiring the output of the AC-DC conversion unit and outputs a signal to the switch selection module. The switch selection module connects the external expansion interface to AC power 220V. This external expansion interface can also connect to other devices. The control module outputs a signal to the safety module indicating that the mobile device cannot be moved. The signal conversion unit outputs the same signal to the safety module, causing the safety module to cut off the power supply to the wheel brake module, thus preventing the mobile device from moving.

[0048] In the prior art, when a mobile device is connected to a socket, it occupies a socket regardless of whether it is charging or not. In scenarios where there is only one socket, it is impossible to connect other electrical devices. The external expansion interface in the embodiment of the present invention can also connect other electrical devices. That is to say, when a mobile device is connected to a socket, the external expansion interface can be used by other electrical devices to charge them.

[0049] like Figure 4 The diagram shows the functional block diagram when the mobile device is not connected to mains power. The charging cable is not connected to mains power and is connected to an external expansion interface. The control module identifies this by acquiring the output of the AC-DC conversion unit and outputs a signal to the switch selection module. The switch selection module connects the external expansion interface to the signal modulation unit. The signal demodulation unit acquires its own signal and sends it to the signal conversion unit. The control module outputs a signal to the safety module to control the movement of the mobile device. The signal conversion unit outputs a signal to the safety module to control the movement of the mobile device. The safety module only supplies power to the wheel brake module when both the control module and the signal conversion unit simultaneously output a signal indicating that the device can be pushed, thus enabling the movement of the mobile device.

[0050] Optionally, the switch selection module includes three sets of relay switches.

[0051] like Figure 5 and Figure 6 As shown, Figure 5 A block diagram showing the structure of the switch selection module connecting an external expansion interface to the mains power. Figure 6 This is a block diagram showing the connection between the external expansion interface and the signal modulation unit for the switch selection module. The switch selection module includes three sets of relay switches. The switch selection module can be controlled by a control module. When the control module detects the output of the AC-DC conversion unit, it connects the three wires of the external expansion interface sequentially to the AC power supply 220. When the control module does not detect the output of the AC-DC conversion unit, it connects the three wires of the external expansion interface sequentially to the signal modulation unit.

[0052] Optionally, the signal modulation unit includes: a current source, a first resistor, a first signal acquisition and processing subunit, and a first relay. The current source is connected to the first resistor, the first resistor is connected to the first signal acquisition and processing subunit, the first signal acquisition and processing subunit is connected to the first relay, and the first relay is connected to the signal conversion unit.

[0053] The first signal acquisition and processing subunit is used to acquire the voltage across the first resistor, and when the voltage across the first resistor is greater than a threshold, it controls the first relay to output dry contacts.

[0054] The first relay is used to output dry contacts to the signal conversion unit;

[0055] The current source is used to generate a modulated current waveform at a preset frequency.

[0056] Optionally, the signal modulation unit further includes a signal synchronization subunit, the current source is connected to the signal synchronization subunit, the signal synchronization subunit is connected to the first resistor, and the signal synchronization subunit is used to control the signals of the L line and N line to be in phase and at the same frequency.

[0057] Optionally, the signal modulation unit further includes a second resistor, which is connected to the first signal acquisition and processing subunit and the current source, respectively, wherein the first resistor is the acquisition resistor for the L line and the second resistor is the acquisition resistor for the N line.

[0058] Optionally, the signal demodulation unit includes: a second signal acquisition and processing subunit, a third resistor, and a second relay. The current source is connected to the third resistor, the third resistor is connected to the second signal acquisition and processing subunit, the second signal acquisition and processing subunit is connected to the second relay, and the second relay is connected to the signal conversion unit. The third resistor is the acquisition resistor of the ground wire.

[0059] like Figure 7 As shown, Figure 7This is a circuit block diagram of the signal modulation unit and the signal demodulation unit. Figure 7 In this circuit, G is a variable-frequency AC current source. The signal synchronization subunit is used to synchronize the signals of the L and N lines, ensuring they are in phase and frequency. The first signal acquisition and processing subunit acquires and processes the voltage across resistors Ra and Rb. For example, it can control the first relay to output a dry contact when the voltage across Ra and / or Rb reaches a threshold. The second signal acquisition and processing subunit acquires and processes the voltage across resistor Rm. For example, it can control the second relay to output a dry contact when the voltage across Rm reaches a threshold. The first relay outputs a dry contact to the signal conversion unit. The second relay outputs a dry contact to the signal conversion unit. The AC current source G can generate a modulated current waveform of a certain frequency. Through the switch selection module, when the charging cable is connected to the external expansion interface, the signal demodulation unit and the signal modulation unit are connected to form a loop. The modulated waveform is generated across resistor Rm, which can be identified and judged by the second signal acquisition and processing subunit to monitor whether the charging cable has been fully retracted; and a dry contact is output through the second relay K. On the other side, the AC current source G can generate a modulated current waveform of a certain frequency. After passing through the signal synchronization subunit, the signals applied to the L line and N line are common-mode signals with the same frequency and phase. After passing through resistors Ra and Rb, and through the switch selection module, when the charging cable is connected to the external expansion interface, the insulation between the L line, N line and the ground line (shell) can be monitored. When the insulation between either the L line or N line and the ground line (shell) decreases, it can be monitored by the first signal acquisition and processing subunit and output to the signal conversion unit by the first relay K.

[0060] Optionally, the signal demodulation unit further includes a signal isolation subunit, which is used to isolate the signals of the signal demodulation unit from those of the signal modulation unit.

[0061] Optionally, the switch selection module is used to connect the signal demodulation unit and the signal modulation unit when the charging cable is connected to an external expansion interface.

[0062] Optionally, the mobile device further includes a battery power supply module and a DC-DC conversion module, wherein the battery power supply module is connected to the DC-DC conversion module and the wheel braking module respectively, and the DC-DC conversion module is connected to the safety module.

[0063] Optionally, the safety module includes: a transformer and a switch, wherein the main side of the transformer is connected to the DC-DC conversion module, the secondary side of the transformer is connected to the wheel braking module, and the switch is connected to the control module.

[0064] Optionally, the safety module further includes a feedback isolation circuit, through which the secondary side of the transformer is connected to the control module and the signal conversion unit. For example, the secondary side of the transformer outputs a level that can be safely disconnected by the control module and the signal conversion unit alone to supply power to the subsequent circuits.

[0065] like Figure 8 As shown, Figure 8 The structural block diagram of the safety and module is shown. The main circuit of the safety and module includes a transformer and a switch. The control module and the signal conversion unit jointly control the safety and module. The safety and module will output normally if and only if the control signals of the control module and the signal conversion unit are pulse signals of a certain frequency.

[0066] When the following situation occurs:

[0067] a. The control signal of the control module is always high or always low;

[0068] b. The control signal of the signal conversion unit is always high or always low;

[0069] c. The control signal of the control module is constantly high or constantly low due to a fault;

[0070] d. The control signal of the signal conversion unit is constantly high or constantly low due to a fault;

[0071] Neither the safety nor the module outputs power. This ensures that the wheel brake module receives no power in case of a fault or abnormal condition.

[0072] The safety module includes: a transformer, a switch, a power supply circuit, an isolation acquisition circuit, an isolation drive circuit, a feedback isolation circuit, and a control circuit. The transformer isolates the main circuit's input and output. The switch performs DC-DC power conversion between the input and output terminals through high-frequency switching. The power supply circuit provides power to the circuit. The isolation acquisition circuit is needed because the control signal and the drive switch signal are not grounded. It also generates a feedback signal similar to the control signal, which is acquired and sent to the control module or signal conversion unit for judgment. The isolation drive circuit is also needed because the control signal and the drive switch signal are not grounded. The feedback isolation circuit acquires the voltage signal from the main circuit's safety module output and sends it to the control circuit in isolation. The control circuit regulates the voltage output of the main circuit's safety module based on the voltage signal sent by the feedback isolation circuit.

[0073] This invention discloses a mobile device. The mobile device includes: an external expansion interface, a switch selection module, a first signal processing module, a control module, a second signal processing module, a safety module, and a wheel braking module. The external expansion interface, the first signal processing module, and the second signal processing module are all connected to the switch selection module. The first signal processing module is connected to the control module. The control module and the second signal processing module are respectively connected to the safety module. The safety module is connected to the wheel braking module. The safety module supplies power to the wheel braking module upon receiving a first control signal from the control module and a second control signal from the second signal processing module, thereby enabling the wheel braking module to control the movement of the mobile device. This invention ensures that the mobile device can only move when the charging cable is fully retracted and the charging plug is plugged into the external expansion interface.

[0074] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A mobile device, characterized by include: The system includes an external expansion interface, a switch selection module, a first signal processing module, a control module, a second signal processing module, a safety module, and a wheel braking module. The external expansion interface, the first signal processing module, and the second signal processing module are all connected to the switch selection module. The first signal processing module is connected to the control module. The control module and the second signal processing module are respectively connected to the safety module. The safety module is connected to the wheel braking module. The control module is configured to send a first control command to the switch selection module if the output signal of the first signal processing module is detected, so as to connect the external expansion interface to the mains power; and to send a second control command to the switch selection module if the output signal of the first signal processing module is not detected, so as to connect the external expansion interface to the second signal processing module. The safety module is used to supply power to the wheel braking module when it receives a first control signal sent by the control module and a second control signal sent by the second signal processing module, so that the wheel braking module controls the movement of the mobile device; The first signal processing module includes: a signal demodulation unit, a power filter, and an AC-DC conversion unit. The switch selection module is connected to the signal demodulation unit, the signal demodulation unit is connected to the power filter, the power filter is connected to the AC-DC conversion unit, and the AC-DC conversion unit is connected to the control module. The second signal processing module includes: a signal modulation unit and a signal conversion unit. The switch selection module is connected to the signal modulation unit. The signal modulation unit and the signal demodulation unit are both connected to the signal conversion unit. The signal conversion unit is connected to the safety module. The signal modulation unit includes: a current source, a first resistor, a first signal acquisition and processing subunit, and a first relay. The current source is connected to the first resistor, the first resistor is connected to the first signal acquisition and processing subunit, the first signal acquisition and processing subunit is connected to the first relay, and the first relay is connected to the signal conversion unit. The first signal acquisition and processing subunit is used to acquire the voltage across the first resistor, and when the voltage across the first resistor is greater than a threshold, it controls the first relay to output dry contacts. The first relay is used to output dry contacts to the signal conversion unit; The current source is used to generate a modulated current waveform at a preset frequency.

2. The mobile device of claim 1, wherein, The signal modulation unit further includes a signal synchronization subunit, the current source is connected to the signal synchronization subunit, the signal synchronization subunit is connected to the first resistor, and the signal synchronization subunit is used to control the signals of the L line and N line to be in phase and frequency.

3. The mobile device of claim 1, wherein, The signal modulation unit further includes a second resistor, which is connected to the first signal acquisition and processing subunit and the current source, respectively. The first resistor is the acquisition resistor for the L line, and the second resistor is the acquisition resistor for the N line.

4. The mobile device according to claim 3, characterized in that, The signal demodulation unit includes: a second signal acquisition and processing subunit, a third resistor, and a second relay. The current source is connected to the third resistor, the third resistor is connected to the second signal acquisition and processing subunit, the second signal acquisition and processing subunit is connected to the second relay, and the second relay is connected to the signal conversion unit. The third resistor is the acquisition resistor of the ground wire.

5. The mobile device of claim 4, wherein, The switch selection module is used to connect the signal demodulation unit and the signal modulation unit when the charging cable is connected to the external expansion interface.

6. The mobile device of claim 1, wherein, The mobile device further includes a battery power supply module and a DC-DC conversion module. The battery power supply module is connected to the DC-DC conversion module and the wheel braking module, respectively. The DC-DC conversion module is connected to the safety module.

7. The mobile device of claim 1, wherein, The switch selection module includes three sets of relay switches.

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