Communication device and communication system

Abstract

The invention relates to a communication device and a communication system, each communication device under the communication system is provided with a charging switch module, an energy storage module, a power supply control module and a voltage conversion module, and the energy storage module is connected to a power line of a communication bus through the charging switch module. When the voltage value of the output voltage of the energy storage module reaches a first threshold value, the power supply control module outputs a turn-off signal to the charging switch module to control the charging switch module to be turned off, and outputs a power-on control signal to control the voltage conversion module to output a power supply signal to power on the communication equipment at the same time; the communication equipment can be ensured to be electrified to work after being stably powered, so that the whole communication system can work stably, and the situation that the system cannot work normally due to the fact that a host power supply of the communication system enters overload protection is avoided.

Description

Technical Field

[0001] This application belongs to the field of power electronics technology, and particularly relates to a communication device and a communication system. Background Art

[0002] For a common RS485 communication architecture, there is one host with multiple sub-devices hanging under it, and each sub-device is powered by the host. However, in this topology, multiple sub-devices are powered on simultaneously. If the number of sub-devices is large, the capacitive load during power-on is too large, resulting in a very large instantaneous pulse during power-on, causing the output power supply of the host to enter overload protection, and thus the system cannot work properly.

[0003] Common solutions are to calculate the above problems in advance, figure out how many devices can be hung on one bus, and then carry out construction. If the power consumption of the sub-device itself is too large, the number of devices that can be hung on the bus is very small, and the resources cannot be fully utilized. Summary of the Invention

[0004] The purpose of this application is to provide a communication device and a communication system, aiming to solve the problem that when multiple sub-devices of a traditional communication system are powered on simultaneously, the load is too large, causing the output power supply of the host to enter overload protection, and thus the system cannot work properly.

[0005] In a first aspect, an embodiment of this application provides a communication system for connecting to a host through a communication bus. The communication device includes:

[0006] A charging switch module;

[0007] An energy storage module, connected to the power line of the communication bus through the charging switch module, for storing and releasing electrical energy based on the current of the power line;

[0008] A power supply control module, connected to the energy storage module and the charging switch module, for outputting a turn-off signal to the charging switch module and an on-power control signal when the voltage value of the output voltage of the energy storage module reaches a first threshold. The turn-off signal is used to control the charging switch module to turn off;

[0009] A voltage conversion module, connected to the energy storage module and the power supply control module, for outputting a power supply signal based on the on-power control signal and the output voltage. The power supply signal is used to supply power to the entire communication device;

[0010] A communication module, connected to the communication line of the communication bus and the voltage conversion module, for powering on based on the power supply signal and communicating with the host.

[0011] In some embodiments, it further includes a control module, which is connected to the voltage conversion module and is configured to output the power-on control signal to the voltage conversion module after power-on.

[0012] In some embodiments, it further includes a detection module. The detection module is connected to the energy storage module and the control module, and is configured to detect the magnitude of the output voltage and output a detection signal.

[0013] The control module is further connected to the charging switch module, and is further configured to output a conduction signal to the charging switch module when it is determined according to the detection signal that the voltage value of the output voltage is less than or equal to the first threshold. The conduction signal is used to control the charging switch module to conduct.

[0014] In some embodiments, the control module is further configured to:

[0015] When the voltage value of the output voltage is less than or equal to the secondary voltage threshold, output the conduction signal until the voltage value of the output voltage is greater than or equal to the primary voltage threshold; or, output the conduction signal for a first duration.

[0016] Wherein the first threshold ≤ the secondary voltage threshold < the primary voltage threshold.

[0017] In some embodiments, the control module is further configured to:

[0018] When the voltage value of the output voltage is less than or equal to the tertiary voltage threshold, output the conduction signal until the voltage value of the output voltage is greater than or equal to the primary voltage threshold.

[0019] Wherein the tertiary voltage threshold < the first threshold < the primary voltage threshold.

[0020] In some embodiments, the control module is further configured to:

[0021] When the voltage value of the output voltage is less than or equal to the tertiary voltage threshold and a first charging permission command is obtained through the communication module, output the conduction signal at intervals for a preset number of second durations. The second charging permission command carries the characteristic information of the preset number of second durations.

[0022] Wherein, the tertiary voltage threshold < the first threshold.

[0023] In some embodiments, the control module is further configured to:

[0024] During the process of outputting the conduction signal, when a pause charging command is obtained through the communication module and the voltage value of the output voltage is greater than or equal to the secondary voltage threshold, the output of the conduction signal is stopped and the turn-off signal is output;

[0025] Wherein, the pause charging command carries the voltage value of the output voltage of other communication devices, and the voltage value of the output voltage of other communication devices ≤ the tertiary voltage threshold < the first threshold.

[0026] In some embodiments, the power supply control module includes:

[0027] A comparison circuit, the first input terminal and the second input terminal of the comparison circuit are respectively connected to the output terminal of the energy storage module and the reference circuit, and the output terminal is connected to the charging switch module and the voltage conversion module. The reference circuit is used to provide the first threshold.

[0028] In some embodiments, the charging switch module includes:

[0029] A first switch tube, connected in series between the power line and the energy storage module;

[0030] A second switch tube, the first conduction end of the second switch tube is connected to the power line, the second conduction end of the second switch tube is connected to the control end of the first switch tube, the control end of the second switch tube is connected to the power supply control module and the control module, and the first switch tube is controlled by the turn-off signal and the conduction signal.

[0031] In some embodiments, the voltage conversion module includes:

[0032] A switch circuit, the input terminal is connected to the energy storage module, the control terminal is connected to the power supply control module and the control module, and the switch circuit is controlled by the power-on control signal;

[0033] A voltage conversion circuit, the input terminal is connected to the output terminal of the switch circuit, and the output terminal outputs the power supply signal.

[0034] In a second aspect, an embodiment of the present application provides a communication device for connecting to a host through a communication bus. The communication device includes:

[0035] A charging switch module;

[0036] An energy storage module, connected to the power line of the communication bus through the charging switch module, and used for storing and releasing electric energy based on the current of the power line;

[0037] A voltage conversion module, connected to the energy storage module, is configured to output a power supply signal based on a power-on control signal and the output voltage of the energy storage module, and the power supply signal is used to supply power to the entire communication device;

[0038] A control module, configured to output the power-on control signal to the voltage conversion module after power-on;

[0039] A detection module, connected to the energy storage module, is configured to detect the magnitude of the output voltage and output a detection signal;

[0040] A control module, connected to the voltage conversion module, the detection module, and the charging switch module, is configured to output the power-on control signal after power-on, determine the voltage value of the output voltage according to the detection signal, and output a conduction signal to the charging switch module when the voltage value of the output voltage is less than or equal to a first threshold, and the conduction signal is used to control the charging switch module to conduct;

[0041] A communication module, connected to the communication line of the communication bus and the voltage conversion module, is configured to be powered on based on the power supply signal and communicate with the host.

[0042] In some embodiments, the charging switch module includes:

[0043] A first switch tube, connected in series between the power supply line and the energy storage module;

[0044] A second switch tube, a first conduction end of the second switch tube is connected to the power supply line, a second conduction end of the second switch tube is connected to a control end of the first switch tube, a control end of the second switch tube is connected to the power supply control module and the control module, and the first switch tube is controlled by the conduction signal.

[0045] In a third aspect, an embodiment of the present application provides a communication system, including:

[0046] A host device;

[0047] Multiple communication devices as described in any one of the above, the communication devices are connected to the host device through a communication bus, and the host device supplies power to and interacts with information with each of the communication devices based on the communication bus.

[0048] The beneficial effects of the embodiments of the present application compared with the related art are as follows: A charging switch module, an energy storage module, a power supply control module, and a voltage conversion module are provided in each communication device in the communication system, and the energy storage module is connected to the power supply line of the communication bus through the charging switch module. When the voltage value of the output voltage of the energy storage module reaches the first threshold, the power supply control module outputs a turn-off signal to the charging switch module to control the charging switch module to turn off, and at the same time outputs a power-on control signal to control the voltage conversion module to output a power supply signal to power on the communication device. Thus, it can be ensured that the communication device is powered on as a whole after stable power supply is obtained, so that the entire communication system can work stably, avoiding the main power supply of the communication system from entering overload protection, and thus the system cannot work properly. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 FIG. is a schematic structural diagram of a communication system provided by an embodiment of the present application;

[0050] Figure 2 FIG. is a schematic structural diagram of a communication device provided by an embodiment of the present application;

[0051] Figure 3 FIG. is a schematic structural diagram of a communication device provided by an embodiment of the present application;

[0052] Figure 4 FIG. is a partial circuit schematic diagram of a communication device provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0054] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0055] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0056] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0057] As Figure 1 shown, a communication device 100 provided by an embodiment of this application is used to connect to a host device 200 through a communication bus. As Figure 2 shown, the communication device 100 includes a charging switch module 110, an energy storage module 120, a power supply control module 130, a voltage conversion module 140, and a communication module 150.

[0058] The energy storage module 120 is connected to the power supply line VCC of the communication bus through the charging switch module 110 and is used to store and release electrical energy based on the current of the power supply line VCC; the power supply control module 130 is connected to the energy storage module 120 and the charging switch module 110 and is used to output a turn-off signal to the charging switch module 110 and an on-power control signal when the voltage value of the output voltage V1 of the energy storage module 120 reaches a first threshold, and the turn-off signal is used to control the charging switch module 110 to turn off; the voltage conversion module 140 is connected to the energy storage module 120 and the power supply control module 130 and is used to output a power supply signal Vout based on the on-power control signal and the output voltage V1, and the power supply signal Vout is used to supply power to the entire communication device 100; the communication module 150 is connected to the communication lines A / B of the communication bus and the voltage conversion module 140 and is used to be powered on based on the power supply signal Vout and communicate with the host device 200.

[0059] Among them, the power-on control signal is used to control the voltage conversion module 140 to connect to the power supply line VCC for power-on. It can be understood that multiple communication devices 100 (i.e., slave devices) are connected to a communication bus of the host device 200 in the communication system, and the communication bus is, for example, an RS485 bus. The charging switch module 110 is default-conducted. At the initial stage of power-on, the energy storage modules 120 of all communication devices 100 are charged together. If there are fewer communication devices 100, the impact on the voltage of the power supply line VCC of the communication bus is small, and the power supply line VCC can normally output electrical energy to charge the energy storage modules 120 of each communication device 100. When there are more communication devices 100 connected to the communication bus, simultaneous charging of the energy storage modules 120 of each communication device 100 will cause the host power supply load of the host device 200 providing the charging current to be too large, which may cause overcurrent protection, and the host power supply will restart. Then, the energy storage modules 120 of each communication device 100 start charging again, and the host power supply overloads and restarts again. This cycle continues until the energy storage modules 120 of the communication devices 100 are fully charged (i.e., the voltage value of the output voltage V1 of the energy storage module 120 reaches the first threshold), and the power supply control module 130 outputs a turn-off signal to turn off the charging switch module 110. At this time, the host power supply can stably output. It should be noted that when the power supply control module 130 outputs a turn-off signal, it also outputs a power-on control signal. That is, only when the charging switch module 110 is turned off, the voltage conversion module 140 is triggered by the power-on control signal to output a power supply signal Vout, and at this time, the entire communication device 100 is powered on, so as to ensure the stable power supply and communication of the entire communication system.

[0060] In some embodiments, the first threshold is, for example, 7V (volts).

[0061] In some embodiments, the energy storage module 120 is, for example, a lithium battery, a rechargeable battery, or a large capacitor.

[0062] As Figure 3 shown, in some embodiments, the communication device 100 further includes a control module 160. The control module 160 is connected to the voltage conversion module 140 and is used to output a power-on control signal to the voltage conversion module 140 after power-on.

[0063] The control module 160 is, for example, a microprocessor. The control module 160 powers on and works based on the power supply signal Vout output by the voltage conversion module 140 after power-on, and immediately outputs a power-on control signal to the voltage conversion module 140 after power-on to maintain the voltage conversion module 140 to continue working and output the power supply signal Vout, ensuring normal power supply of the entire machine. During the normal operation of the entire machine, the control module 160 will continuously maintain the provision of this power-on control signal until the communication device 100 needs to shut down and then stops outputting this power-on control signal.

[0064] As Figure 3As shown, in some embodiments, the communication device 100 further includes a detection module 170. The detection module 170 is connected to the energy storage module 120 and the control module 160, and is used to detect the magnitude of the output voltage V1 and output a detection signal. The control module 160 is further connected to the charging switch module 110, and is further used to output a conduction signal to the charging switch module 110 when it is determined according to the detection signal that the voltage value of the output voltage V1 is less than or equal to the first threshold. The conduction signal is used to control the charging switch module 110 to conduct.

[0065] All power supplies of the communication device 100 are provided by the energy storage module 120. During normal operation, the connection between the energy storage module 120 and the power supply line VCC of the communication bus is disconnected (i.e., the charging switch module 110 is disconnected) for most of the time. It is not until its voltage drops to the first threshold that the control module 160 will output a conduction signal to turn on the charging switch module 110 to charge the energy storage module 120. It can be understood that

[0066] In some scenarios, if the voltages of the energy storage modules 120 of multiple communication devices 100 all drop to the first threshold and need to be charged, the host power supply may be overloaded and restarted at this time. Therefore, a set of charging logics between different sub-devices needs to be set.

[0067] The charging end voltage thresholds of the energy storage module 120 are divided into three levels:

[0068] The first-level voltage threshold refers to the voltage when the energy storage module 120 is fully charged. For example, if the voltage of the power supply line VCC of the communication bus is 12V, then the first-level voltage threshold is 12V. Usually, in this case, the energy storage module 120 can be used for a long time.

[0069] The second-level voltage threshold refers to the voltage at which the entire communication device 100 can work, such as 7.2V or 7.5V. The continuous working time between the first level and the second level is TH1.

[0070] The third-level voltage threshold refers to the voltage that can only support the control module 160 and the communication module 150 on the board, such as 3.3V, 3.5V, 5V or 5.5V. The continuous working time between the second level and the third level is TH2.

[0071] In some embodiments, the control module 160 is further used for:

[0072] When the voltage value of the output voltage V1 is less than or equal to the second-level voltage threshold, output a conduction signal until the voltage value of the output voltage V1 is greater than or equal to the first-level voltage threshold, that is, the charging switch module 110 can conduct, and the energy storage module 120 is charged to a full state. Then, output a turn-off signal to disconnect the charging switch module 110 and release the charging power of the power supply line VCC, where the first threshold ≤ the second-level voltage threshold < the first-level voltage threshold.

[0073] Among them, setting the first threshold ≤ the secondary voltage threshold can ensure that when the charging power of the communication device 100 is insufficient, the electric energy of the energy storage module 120 can still maintain the operation of the whole machine for a period of time.

[0074] Optionally, the control module 160 is further configured to:

[0075] When the voltage value of the output voltage V1 is less than or equal to the secondary voltage threshold, control the communication module 150 to send a second charging request, and when a second charging permission command is obtained through the communication module 150, output a conduction signal until the voltage value of the output voltage V1 is greater than or equal to the first voltage threshold.

[0076] In some cases, the charging process of the communication device 100 requires unified configuration by the host device 200.

[0077] Optionally, the control module 160 is further configured to:

[0078] After the voltage value of the output voltage V1 is greater than or equal to the first voltage threshold, control the communication module 150 to send a charging completion command to inform the host device 200 that the communication device 100 has been charged, and release the voltage of the power supply line VCC to facilitate the charging of other communication devices 100.

[0079] In some embodiments, the control module 160 is further configured to:

[0080] When the voltage value of the output voltage V1 is less than or equal to the secondary voltage threshold, output a conduction signal for the first duration.

[0081] It can be understood that the conduction signal for the first duration enables the energy storage module 120 to be charged for the first duration. Among them, the first duration can be configured according to the charging power of the power supply line VCC and the stored power of the energy storage module 120. In particular, the charging for the first duration can at least ensure that the voltage value of the output voltage V1 of the energy storage module 120 is greater than or equal to the secondary voltage threshold. Compared with the energy storage module 120 being charged to full, charging for the first duration can release the charging power of the power supply line VCC in advance to facilitate the charging of other communication devices 100.

[0082] Optionally, the control module 160 is further configured to:

[0083] When the voltage value of the output voltage V1 is less than or equal to the secondary voltage threshold, control the communication module 150 to send a second charging request, and when a third charging permission command is obtained through the communication module 150, output a conduction signal for the first duration, where the third charging permission command carries characteristic information of the first duration.

[0084] In some cases, the charging process of the communication device 100 requires unified configuration by the host device 200.

[0085] In some scenarios, when the output voltage V1 of the energy storage module 120 in each communication device 100 drops to the secondary voltage threshold, charging needs to start. When the current communication device 100 needs to charge, the communication device 100 needs to send a charging notification command to the host device 200 via communication line A / B on the communication bus of the communication module 150, indicating that charging is about to start and the charging will last for the first duration. If within this first duration period, the output voltage V1 of the energy storage module 120 of another communication device 100 also drops to the secondary voltage threshold and needs to charge, then it is necessary to wait until the end of the first duration or wait for the current communication device 100 to send a charging complete command indicating full charge.

[0086] In some embodiments, the control module 160 is further configured to:

[0087] When the voltage value of the output voltage V1 is less than or equal to the tertiary voltage threshold, an on-signal is output until the voltage value of the output voltage V1 is greater than or equal to the primary voltage threshold, where the tertiary voltage threshold < the first threshold.

[0088] At this time, the voltage value of the output voltage V1 of the energy storage module 120 of the communication device 100 is less than or equal to the tertiary voltage threshold, and only the control module 160 and the communication module 150 can be maintained to work. Priority charging is required.

[0089] Optionally, the control module 160 is further configured to:

[0090] When the voltage value of the output voltage V1 is less than or equal to the tertiary voltage threshold, while outputting the on-signal, the communication module 150 is also controlled to send a charging notification command to the host device 200. The host device 200 then issues a stop charging command to other communication devices 100 that are charging. After receiving the stop charging command, the other communication devices 100 that are charging exit the charging, that is, stop outputting the on-signal and output an off-signal to their charging switch modules 110, where the output voltage V1 of the energy storage module 120 of the other communication devices 100 should be greater than or equal to the secondary voltage threshold. At this time, the current communication device 100 starts charging.

[0091] In some embodiments, the control module 160 is further configured to:

[0092] When the voltage value of the output voltage V1 is less than or equal to the tertiary voltage threshold, an on-signal is output until the voltage value of the output voltage V1 is greater than or equal to the secondary voltage threshold. At this time, the device starts charging.

[0093] When the voltage value of the output voltage V1 of the energy storage module 120 reaches the secondary voltage threshold, if the voltage value of the output voltage V1 of the energy storage module 120 of the communication device 100 does not drop to the tertiary voltage threshold, continue charging until the primary voltage threshold is reached and then release the charging power of the power supply line VCC. If the voltage value of the output voltage V1 of the energy storage module 120 reaches the secondary voltage threshold and the voltage value of the output voltage V1 of the energy storage module 120 of another communication device 100 drops to the voltage threshold, immediately release the charging power of the power supply line VCC.

[0094] In some embodiments, the control module 160 is further configured to:

[0095] When the voltage value of the output voltage V1 is less than or equal to the tertiary voltage threshold, output a conduction signal for a certain duration.

[0096] It can be understood that the conduction signal for a certain duration enables the energy storage module 120 to be charged for a certain duration. Among them, the certain duration can be configured according to the charging power of the power supply line VCC and the stored power of the energy storage module 120. In particular, charging for a certain duration can at least ensure that the voltage value of the output voltage V1 of the energy storage module 120 is greater than or equal to the secondary voltage threshold. Compared with the energy storage module 120 being charged to full, charging for a certain duration can release the charging power of the power supply line VCC in advance, facilitating charging of other communication devices 100.

[0097] Optionally, the control module 160 is further configured to:

[0098] When the voltage value of the output voltage V1 is less than or equal to the tertiary voltage threshold, control the communication module 150 to send a third charging request; and when a fourth charging permission command is obtained through the communication module 150, output a conduction signal until the voltage value of the output voltage V1 is greater than or equal to the secondary voltage threshold.

[0099] In some cases, the charging process of the communication device 100 needs to be uniformly configured by the host device 200.

[0100] In some embodiments, the control module 160 is further configured to:

[0101] When the voltage value of the output voltage V1 is less than or equal to the tertiary voltage threshold and a first charging permission command is obtained through the communication module 150, intermittently output a preset number of conduction signals with a second duration, and the first charging permission command carries characteristic information of the preset number of second durations.

[0102] If the voltage value of the output voltage V1 of the energy storage module 120 of the current communication device 100 drops to the third-level voltage threshold, and other communication devices 100 have the same situation during the charging process and need to be charged after falling to the third-level voltage threshold, the host device 200 needs to configure these communication devices 100 that have fallen to the third-level voltage threshold to charge in time. For example, at the first moment, the first communication device 100 starts charging for the second time period and then stops. At the moment when the second time period ends, the second communication device 100 stops charging for the second time period. Then the first communication device 100 continues to charge for the second time period, and so on. Each communication device 100 takes turns to charge for the second time period. The charging logic is triggered when multiple communication devices 100 drop to the third-level voltage threshold at the same time. The user can configure and debug the second time period according to the actual situation.

[0103] Among them, the characteristic information of the preset second time lengths should include the number of second time lengths output at intervals, the set value of the second time length, etc.

[0104] In some embodiments, the control module 160 is further configured to:

[0105] While outputting the on signal, the control communication module 150 sends a charging notification command to the host device 200 .

[0106] In some embodiments, the control module 160 is further configured to:

[0107] After the voltage value of the output voltage V1 is greater than or equal to the corresponding voltage threshold or stops outputting the conduction signal, the control communication module 150 sends a charging completion command to inform the host device 200 that the communication device 100 has been charged and releases the voltage of the power line VCC to facilitate the configuration of other communication devices 100 for charging.

[0108] In some embodiments, the control module 160 is further configured to:

[0109] In the process of outputting the on-signal, the communication module 150 obtains the charging pause command, and when the voltage value of the output voltage V1 is greater than or equal to the secondary voltage threshold, the on-signal is stopped from being output and the off-signal is output; wherein the charging pause command carries the voltage value of the output voltage V1 of other communication devices 100, and the voltage value of the output voltage V1 of other communication devices 100 is ≤ the tertiary voltage threshold < the first threshold. In this way, the host device 200 can configure the communication device 100 that needs to be charged first to charge immediately, so as to avoid power supply and communication instability of the communication system.

[0110] In some embodiments, the communication device 100 further includes a power supply circuit 180. The power supply circuit 180 includes a voltage-dividing resistor R1 and a voltage-regulating diode D1. The voltage-dividing resistor R1 and the voltage-regulating diode D1 are connected in series between the output terminal of the energy storage module 120 and the ground. The cathode of the voltage-regulating diode D1 serves as the output terminal of the power supply circuit 180, and outputs a power supply voltage V2.

[0111] As Figure 4 shown, in some embodiments, the power supply control module 130 includes:

[0112] A comparison circuit. The first input terminal and the second input terminal of the comparison circuit are respectively connected to the output terminal of the energy storage module 120 and the reference circuit. The output terminal is connected to the charging switch module 110 and the voltage conversion module 140. The reference circuit is used to provide a first threshold value.

[0113] Among them, the comparison circuit includes a comparator U1. The inverting input terminal of the comparator U1 constitutes the first input terminal and is connected to the output of the energy storage module 120 through a first voltage-dividing network (resistors R2, R3). The non-inverting input terminal of the comparator U1 constitutes the second input terminal and is connected to the power supply voltage V2 through a second voltage-dividing network (resistors R4, R5). The power supply voltage V2 is divided by the second voltage-dividing network to obtain the voltage of the first threshold value. It can be understood that the second voltage-dividing network is the reference circuit. The output terminal of the comparator U1 is connected to the voltage conversion module 140 through a resistor R6.

[0114] In some embodiments, the charging switch module 110 includes:

[0115] A first switching tube Q1, connected in series between the power supply line VCC and the energy storage module 120;

[0116] A second switching tube Q2. The first conduction terminal of the second switching tube Q2 is connected to the power supply line VCC. The second conduction terminal of the second switching tube Q2 is connected to the control terminal of the first switching tube Q1. The control terminal of the second switching tube Q2 is connected to the power supply control module 130 and the control module 160. The first switching tube Q1 is controlled by a turn-off signal and a turn-on signal.

[0117] Among them, the first switching tube Q1 is, for example, a first PMOS tube. The source of the first PMOS tube is connected to the power supply line VCC, and the drain is connected to the energy storage module 120. The second switching tube Q2 is, for example, a first NMOS tube. The drain of the first NMOS tube is connected to the power supply line VCC. The source of the first NMOS tube is connected to the gate of the first PMOS tube and grounded through a resistor R11. The gate of the first NMOS tube is connected to the first IO port IO1 of the control module 160 and the output terminal of the comparator U1.

[0118] In some embodiments, the voltage conversion module 140 includes:

[0119] A switching circuit 141, with its input terminal connected to the energy storage module 120 and its control terminal connected to the power supply control module 130 and the control module 160. The switching circuit 141 is controlled by a power-on control signal.

[0120] A voltage conversion circuit 142, with its input terminal connected to the output terminal of the switching circuit 141 and its output terminal outputting a power supply signal Vout.

[0121] Among them, the switching circuit 141 includes a second PMOS transistor and a second NMOS transistor. The gate of the second NMOS transistor constitutes the control terminal of the switching circuit 141, which is connected to the second IO port IO2 of the control module 160 and the output terminal of the comparator U1, receives the power-on control signal, and is grounded through the resistor R7. The drain of the second NMOS transistor is connected to the power supply line VCC through the resistor R8. The drain of the second NMOS transistor is also connected to the gate of the second PMOS transistor. The source of the second NMOS transistor is grounded. The source of the second PMOS transistor is connected to the energy storage module 120. The drain of the second PMOS transistor constitutes the output terminal of the switching circuit 141 and is connected to the input terminal of the voltage conversion circuit 142.

[0122] The voltage conversion circuit 142 is, for example, a DC-DC module or an LDO (low dropout regulator) module.

[0123] In some embodiments, the detection module 170 includes a resistor R9 and a resistor R10. The resistor R9 and the resistor R10 are connected in series between the energy storage module 120 and the ground. The series connection node of the resistor R9 and the resistor R10 is connected to the ADC (analog-to-digital converter) port of the control module 160. The control module 160 obtains the magnitude of the output voltage V1 of the energy storage module 120 based on the voltage component obtained through the ADC port.

[0124] Please continue to refer to Figure 1 , this embodiment of the present application also provides a communication system, including:

[0125] A host device 200;

[0126] Multiple communication devices 100 as described above. The communication devices 100 are connected to the host device 200 through a communication bus. The host device 200 supplies power to and interacts with information with each communication device 100 based on the communication bus.

[0127] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included within the protection scope of the present application.

Claims

1. A communication device, characterized in that: Used to connect with the host through a communication bus, the communication device includes: Charging switch module; an energy storage module, connected to a power line of the communication bus through the charging switch module, for storing and releasing electric energy based on the current of the power line; a power supply control module, connected to the energy storage module and the charging switch module, and configured to output a shutdown signal to the charging switch module and a power-on control signal when the voltage value of the output voltage of the energy storage module reaches a first threshold, wherein the shutdown signal is used to control the charging switch module to shut down; A voltage conversion module, connected to the energy storage module and the power supply control module, and configured to output a power supply signal based on the power-on control signal and the output voltage, wherein the power supply signal is used to supply power to the entire communication device; A communication module is connected to the communication line of the communication bus and the voltage conversion module, and is used to power on based on the power supply signal and communicate with the host.

2. The communication device according to claim 1, characterized in that It also includes a control module, which is connected to the voltage conversion module and is used to output the power-on control signal to the voltage conversion module after power-on.

3. The communication device according to claim 2, characterized in that It also includes a detection module, which is connected to the energy storage module and the control module and is used to detect the magnitude of the output voltage and output a detection signal; The control module is also connected to the charging switch module, and is also used to output a conduction signal to the charging switch module when it is determined by the detection signal that the voltage value of the output voltage is less than or equal to the first threshold value, and the conduction signal is used to control the conduction of the charging switch module.

4. The communication device according to claim 3, characterized in that The control module is also used for: When the voltage value of the output voltage is less than or equal to the secondary voltage threshold, output the conduction signal until the voltage value of the output voltage is greater than or equal to the primary voltage threshold; or, output the conduction signal of the first duration; Among them, the first threshold ≤ the secondary voltage threshold < the primary voltage threshold.

5. The communication device according to claim 3, characterized in that The control module is also used for: When the voltage value of the output voltage is less than or equal to the third-level voltage threshold, outputting the conduction signal until the voltage value of the output voltage is greater than or equal to the first-level voltage threshold; The third-level voltage threshold is less than the first threshold and less than the first-level voltage threshold.

6. The communication device according to claim 3, characterized in that The control module is also used for: When the voltage value of the output voltage is less than or equal to the third-level voltage threshold and the first charging permission command is obtained through the communication module, the conduction signal of the preset second time length is output at intervals, and the first charging permission command carries the characteristic information of the preset second time length; Among them, the third-level voltage threshold is less than the first threshold.

7. The communication device according to any one of claims 4 to 6, characterized in that: The control module is also used for: In the process of outputting the conduction signal, when a charging pause command is obtained through the communication module and when the voltage value of the output voltage is greater than or equal to the secondary voltage threshold, the conduction signal is stopped from being output and the shutdown signal is output; The charging pause command carries the voltage value of the output voltage of other communication devices, and the voltage value of the output voltage of other communication devices is ≤ the third-level voltage threshold < the first threshold.

8. The communication device according to claim 1, characterized in that The power supply control module comprises: A comparison circuit, wherein the first input terminal and the second input terminal of the comparison circuit are respectively connected to the output terminal of the energy storage module and the reference circuit, the output terminal is connected to the charging switch module and the voltage conversion module, and the reference circuit is used to provide the first threshold.

9. The communication device according to claim 2, characterized in that The charging switch module comprises: A first switch tube, connected in series between the power line and the energy storage module; A second switch tube, wherein the first conduction end of the second switch tube is connected to the power line, the second conduction end of the second switch tube is connected to the control end of the first switch tube, the control end of the second switch tube is connected to the power supply control module and the control module, and the first switch tube is controlled by the shutdown signal and the conduction signal.

10. The communication device according to claim 2, characterized in that The voltage conversion module comprises: A switch circuit, wherein the input end is connected to the energy storage module, the control end is connected to the power supply control module and the control module, and the switch circuit is controlled by the power-on control signal; The voltage conversion circuit has an input end connected to the output end of the switch circuit and an output end outputting the power supply signal.

11. A communication device, characterized in that: Used to connect with the host through a communication bus, the communication device includes: Charging switch module; an energy storage module, connected to a power line of the communication bus through the charging switch module, for storing and releasing electric energy based on the current of the power line; A voltage conversion module, connected to the energy storage module, used to output a power supply signal based on a power-on control signal and an output voltage of the energy storage module, wherein the power supply signal is used to supply power to the entire communication device; A control module, used for outputting the power-on control signal to the voltage conversion module after power-on; A detection module, which is connected to the energy storage module and is used to detect the magnitude of the output voltage and output a detection signal; a control module, connected to the voltage conversion module, the detection module and the charging switch module, configured to output the power-on control signal after power-on, determine the voltage value of the output voltage according to the detection signal, and output a conduction signal to the charging switch module when the voltage value of the output voltage is less than or equal to a first threshold, wherein the conduction signal is used to control the charging switch module to conduct; A communication module is connected to the communication line of the communication bus and the voltage conversion module, and is used to power on based on the power supply signal and communicate with the host.

12. The communication device according to claim 11, characterized in that The charging switch module comprises: A first switch tube, connected in series between the power line and the energy storage module; A second switch tube, wherein the first conduction end of the second switch tube is connected to the power line, the second conduction end of the second switch tube is connected to the control end of the first switch tube, the control end of the second switch tube is connected to the power supply control module and the control module, and the first switch tube is controlled by the conduction signal.

13. A communication system, characterized in that: include: Host device; A plurality of communication devices according to any one of claims 1 to 10 or claim 11 or 12, wherein the communication devices are connected to the host device via a communication bus, and the host device supplies power to each of the communication devices and exchanges information based on the communication bus.

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