Monitoring management circuit and carrier power supply system

Abstract

The utility model discloses a monitoring management circuit and a carrier power supply system. The carrier power supply system comprises a power supply input end, a positive bus and a negative bus, the monitoring management circuit comprises a current detection module, an enabling control module and a first power supply management module, and the current detection module is connected with the positive bus and is used for detecting the current of the positive bus and generating an overcurrent signal according to the current; the enabling control module is connected with the current detection module and is used for generating an enabling signal when the overcurrent signal is smaller than or equal to a first preset threshold value and stopping generating the enabling signal when the overcurrent signal is larger than the first preset threshold value; the first power management module is connected with the power input end, the positive bus and the enabling control module and used for outputting carrier power voltage to the positive bus according to the enabling signal and power input voltage provided by the power supply end. The monitoring management circuit can disconnect the loop from the positive electrode when the carrier power supply system is short-circuited, so that the carrier power supply system is protected in time.

Description

Technical Field

[0001] The present application relates to the field of carrier communication technology, and in particular to a monitoring management circuit and a carrier power supply system. Background Art

[0002] Modern industrial control currently places increasingly stringent requirements on on-site wiring and communication. Carrier-powered communication, with its simplicity, scalability, and ease of maintenance, is widely used in the building control industry. Carrier-powered communication utilizes power lines as a communication channel, transmitting analog or digital signals via carrier waves while also providing power. For example, direct communication between indoor units and wired controllers requires only two wires for both power and communication.

[0003] However, the power supply solution between the subject and the receiver of carrier-powered communication is not perfect. In scenarios with multiple power supply entities and multiple power receivers, wiring short circuits or overcurrent problems often occur. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application needs to provide a monitoring management circuit and a carrier power supply system.

[0005] The monitoring and management circuit of the embodiment of the present application is used in a carrier power supply system, wherein the carrier power supply system includes a power input terminal and a bus, wherein the bus includes a positive bus and a negative bus, and the monitoring and management circuit includes:

[0006] a current detection module, connected to the positive bus, configured to detect the current of the positive bus and generate an overcurrent signal according to the current;

[0007] an enable control module, connected to the current detection module, configured to generate an enable signal when the overcurrent signal is less than or equal to a first preset threshold, and stop generating the enable signal when the overcurrent signal is greater than the first preset threshold;

[0008] The first power management module is connected to the power input terminal, the positive bus and the enable control module, and is used to output a carrier power voltage to the positive bus according to the enable signal and the power input voltage provided by the power supply terminal.

[0009] In some embodiments, the first power management module includes:

[0010] A voltage conversion unit, wherein the voltage conversion unit is respectively connected to the power input terminal, the positive bus and the enable control module, and is used to output the carrier power supply voltage to the positive bus according to the power input voltage when receiving the enable signal from the enable control module.

[0011] In some embodiments, the first power management module includes:

[0012] a voltage conversion unit, the voltage conversion unit being connected to the power input terminal and configured to generate the carrier power voltage according to the power input voltage;

[0013] A switch unit is connected to the voltage conversion unit, the positive bus and the enable control module, and the switch unit is used to be turned on when receiving the enable signal so that the voltage conversion unit is connected to the positive bus.

[0014] In some embodiments, the monitoring management circuit further includes:

[0015] a reverse connection detection module connected to the positive bus, the negative bus, and the enable control module, the reverse connection detection module being configured to detect a connection state of the bus and generate a reverse connection detection signal according to the connection state;

[0016] The enable control module is further configured to stop providing the enable signal to the first power management module when the reverse connection detection signal is a high level signal.

[0017] In some embodiments, the monitoring management circuit further includes a controller connected to the current detection module and the enable control module, and the controller is configured to:

[0018] When the overcurrent signal is less than a second preset threshold, controlling the enable control module to provide the enable signal to the first power management module; or

[0019] When the overcurrent signal is greater than the second preset threshold and less than the first preset threshold, the enable control module is controlled to provide the enable signal to the first power management module for a preset period of time and then stop providing the enable signal to the first power management module.

[0020] In some embodiments, the monitoring management circuit further includes a second power management module, the second power management module being connected to the power input terminal and configured to generate a reference voltage based on the power input voltage of the power input terminal; the enable control module includes a first enable generation unit, the first enable generation unit including:

[0021] a first current limiting resistor, one end of the first current limiting resistor being connected to the second power management module, and the other end of the first current limiting resistor being connected to the first power management module;

[0022] A first switching transistor, wherein a first electrode of the first switching transistor is connected to the other end of the first current limiting resistor, a second electrode of the first switching transistor is connected to the ground end, and a control electrode of the first switching transistor is connected to the current detection module.

[0023] In some embodiments, the enable control module includes a second enable generation unit, and the first enable generation unit includes:

[0024] a second current limiting resistor, one end of the second current limiting resistor being connected to the second power management module, and the other end of the second current limiting resistor being connected to the first power management module;

[0025] a second switching transistor, wherein a first electrode of the second switching transistor is connected to the other end of the second current limiting resistor, a second electrode of the second switching transistor is connected to the ground end, and a control electrode of the second switching transistor is connected to the reverse connection detection module and the controller.

[0026] In some embodiments, the reverse connection detection module includes:

[0027] a third current limiting resistor, one end of which is connected to the positive bus;

[0028] a first diode, wherein an anode of the first diode is connected to the cathode bus;

[0029] a fourth current limiting resistor, one end of the fourth current limiting resistor being connected to the second power management module;

[0030] a fifth current limiting resistor, one end of the fifth current limiting resistor being connected to the other end of the fourth current limiting resistor, and the other end of the fifth current limiting resistor being connected to the enable control module;

[0031] An optocoupler device, the optocoupler device including a first pin, a second pin, a third pin and a fourth pin, the first pin being connected to the cathode of the first diode, the second pin being connected to the other end of the third current-limiting resistor, the third pin being connected to the ground end, and the fourth pin being connected to the other end of the fourth current-limiting resistor.

[0032] In some embodiments, the current detection module includes:

[0033] an overcurrent protection resistor connected in series to the positive bus;

[0034] An integrated operational amplifier unit is connected to both ends of the overcurrent protection resistor and the enable control module, and is used to generate the overcurrent signal according to the voltage across both ends of the overcurrent protection resistor.

[0035] In some embodiments, the integrated operational amplifier unit includes one of a subtractor and a differential amplifier.

[0036] In some embodiments, the integrated operational amplifier unit includes:

[0037] a first detection resistor, one end of the first detection resistor being connected to one end of the overcurrent protection resistor;

[0038] a second detection resistor, one end of the second detection resistor being connected to the other end of the overcurrent protection resistor;

[0039] a comparator, comprising a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected to the other end of the first detection resistor, the second input terminal is connected to the other end of the second detection resistor, and the output terminal is connected to the enable control module;

[0040] a differential amplifier resistor, one end of which is connected to the second input end, and the other end of which is connected to the output end;

[0041] a first grounding resistor, one end of which is connected to the first input terminal, and the other end of which is connected to the ground terminal;

[0042] A second grounding resistor has one end connected to the output end and the other end connected to the ground end.

[0043] In some embodiments, the overcurrent protection resistor includes multiple overcurrent protection resistors, and the multiple overcurrent protection resistors are connected in parallel.

[0044] In some embodiments, the monitoring management circuit further includes:

[0045] A second diode has an anode connected to the first power management module and a cathode connected to the positive bus.

[0046] The carrier power supply system of the embodiment of the present application includes the monitoring and management circuit of any of the above embodiments.

[0047] In the monitoring management circuit and carrier power supply system of the embodiment of the present application, an overcurrent signal is generated by connecting the current detection module to the positive bus to detect the current of the positive bus, and the enable control module stops generating the enable signal when the overcurrent signal is greater than a first preset threshold value (that is, when a short circuit occurs in the carrier power supply system), so that the first power management module stops providing the carrier power supply voltage to the positive bus when a short circuit occurs in the carrier power supply system, that is, disconnects from the positive pole of the carrier power supply system to stop supplying power to the load device, thereby achieving protection of the carrier power supply system.

[0048] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0050] Figure 1 It is a module schematic diagram of the carrier power supply system of the embodiment of the present application.

[0051] Figure 2 This is another module diagram of the carrier power supply system according to the embodiment of the present application.

[0052] Figure 3 It is a circuit diagram of a carrier power supply system according to an embodiment of the present application.

[0053] Description of main component symbols:

[0054] 100-carrier power supply system; 10-monitoring management circuit, 11-current detection module, R11-overcurrent protection resistor, 111-integrated operational amplifier unit, R12-first detection resistor, R13-second detection resistor, IC1-comparator, R14-differential amplifier resistor, R15-first grounding resistor, 12-enable control module, 121-first enable generation unit, R21-first current limiting resistor, Q1-first switching transistor, 122-second enable generation unit, R 22-second current limiting resistor, Q2-second switching transistor, 13-first power management module, 131-voltage conversion unit, 14-reverse connection detection module, R41-third current limiting resistor, D1-first diode, R42-fourth current limiting resistor, R45-fifth current limiting resistor, IC2-optocoupler device, 15-controller, 16-second power management module, 20-power input terminal, 30-bus, 31-positive bus, 32-negative bus, GND-ground terminal. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0056] As modern industrial control places increasingly stringent requirements on on-site wiring and communication, carrier-based power supply communication, with its simplicity, scalability, and ease of maintenance, is widely used in the building control industry. Depending on the communication protocol, carrier-based communication currently includes Home Bus carrier-based communication, 485 carrier-based communication, and KNX carrier-based communication.

[0057] Typically, communication chip manufacturers only provide communication solutions, but their power supply solutions between the main body and the recipient of carrier-powered communication are not perfect. When the wiring scenario of the application has multiple power supply bodies and multiple power recipients, if one or several devices have abnormal conditions such as short circuits, it will trigger the main power supply device to shut down the MOS for protection control. Since the control protection of the main power supply device acts on the negative end of the bus, but abnormal conditions such as short circuits occur on other bus devices, this will cause the short-circuit loop to still exist, and the short-circuit protection function cannot be normally implemented. At the same time, the circuit shutdown relies on chip control, and when an abnormality occurs, it cannot be shut down in a timely and effective manner.

[0058] In view of this, please see Figure 1 and Figure 3 The present application provides a carrier power supply system 100, which includes a monitoring and management circuit 10, a power input terminal 20, and a bus 30. The power input terminal 20 is connected to the bus 30 through the monitoring and management circuit 10. The bus 30 includes a positive bus 31 and a negative bus 32. The monitoring and management circuit 10 is used to control the power input terminal 20 to supply power to the bus 30.

[0059] The monitoring and management circuit 10 includes a current detection module 11, an enable control module 12, and a first power management module 13. The current detection module 11 is connected to the negative bus 32 and is used to detect the current of the positive bus 31 and generate an overcurrent signal based on the current. The enable control module 12 is connected to the current detection module 11 and is used to generate an enable signal when the overcurrent signal is less than or equal to a first preset threshold, and to stop generating the enable signal when the overcurrent signal is greater than the first preset threshold. The first power management module 13 is connected to the power input terminal 20, the positive bus 31, and the enable control module 12, and is used to output a carrier power supply voltage to the positive bus 31 based on the enable signal and the power input voltage provided by the power supply terminal.

[0060] In the carrier power supply system 100 and the detection management circuit of the embodiment of the present application, an overcurrent signal is generated by connecting the current detection module 11 to the positive bus 31 to detect the current of the positive bus 31, and the enable control module 12 stops generating the enable signal when the overcurrent signal is greater than the first preset threshold value (that is, when an overcurrent or short circuit occurs in the carrier power supply system 100), so that the first power management module 13 stops providing the carrier power supply voltage to the positive bus 31 when a short circuit occurs in the carrier power supply system 100, that is, disconnecting from the positive pole of the carrier power supply system 100 to stop supplying power to the load device, thereby achieving protection of the carrier power supply system 100.

[0061] Specifically, the carrier power supply system 100 adopts power line carrier technology. Those skilled in the art can understand that power line carrier technology (Power Line Communication, PLC) refers to injecting a high-frequency carrier signal into the power line through a coupler, and then using the power line as a transmission medium to transmit the signal to the target location, and finally demodulating and processing it through the corresponding receiving equipment, thereby realizing data transmission and control.

[0062] The carrier power supply system 100 includes a power supply device, a positive bus 31, a negative bus 32 and a load device, and the power supply device can be connected to the load device through the positive bus 31 and the negative bus 32. The power supply device can supply power to the load device through the positive bus 31 and the negative bus 32 and communicate with the load device.

[0063] For example, in some examples, the carrier power supply system 100 can be a central air-conditioning system, which includes a wired controller and an indoor unit, wherein the wired controller serves as a power supply device for the indoor unit, and the indoor unit serves as a load device. The wired controller and the indoor unit can be connected through the positive bus 31 and the negative bus 32, so that the wired controller can power the indoor unit and communicate with the indoor unit at the same time.

[0064] The power supply device may include a power input terminal 20 and a monitoring and management circuit 10 electrically connected to the power input terminal 20. The power input terminal 20 may be a power source for the power supply device and may output a power input voltage, which may be 34 volts. The monitoring and management circuit 10 is connected to the load device via a positive bus 31 and a negative bus 32 to form a loop. The monitoring and management circuit 10 is capable of converting the power input voltage into the carrier power voltage required by the load device and transmitting it to the load device via the positive bus 31 to power the load device.

[0065] The monitoring and management circuit 10 includes a current detection module 11, an enable control module 12, and a first power management module 13. The current detection module 11 is connected to the positive bus 31. The magnitude of the overcurrent signal is positively correlated with the current in the positive bus 31. That is, the greater the current in the positive bus 31, the greater the overcurrent signal. Therefore, the overcurrent signal can be used to determine the current in the positive bus 31 and, therefore, whether a short circuit or overcurrent condition exists in the carrier power system 100.

[0066] The enable control module 12 is connected to the current detection module 11, and the first power management module 13 is connected to the power input terminal 20 and the positive bus 31, respectively. The enable control module 12 is configured to generate an enable signal when the overcurrent signal is less than or equal to a first preset threshold value, and input the enable signal to the first power management module 13, causing the first power management module 13 to convert the power input voltage at the power input terminal 20 into a carrier power voltage based on the enable signal and output the voltage to the positive bus 31. The enable control module 12 is further configured to stop generating the enable signal when the overcurrent signal is greater than the first preset threshold value, causing the first power management module 13 to stop converting the power input voltage at the power input terminal 20 into the carrier power voltage.

[0067] It should be noted that the first preset threshold is a value set by the monitoring management circuit 10 to determine whether the carrier power supply system 100 is short-circuited. The actual size of the first preset threshold can be set according to the actual situation of the carrier power supply system 100, and the specific value is not limited. When the overcurrent signal is greater than the first preset threshold, it indicates that the carrier power supply system 100 has a short circuit or overcurrent phenomenon, and the power supply device needs to be disconnected from the load device. Therefore, the enable control module 12 stops generating the enable signal when the overcurrent signal is greater than the first preset threshold, thereby controlling the first power management module 13 to be disconnected from the positive bus 31, so that the power supply device is disconnected from the load device, thereby realizing the protection of the carrier power supply system 100 when the monitoring management circuit 10 is in an abnormal state in the carrier power supply system 100.

[0068] See also Figure 3 In some embodiments, the first power management module 13 includes a voltage conversion unit 131, which is respectively connected to the power input terminal 20, the positive bus 31 and the enable control module 12, and is used to output a carrier power supply voltage to the positive bus 31 according to the power input voltage when receiving an enable signal from the enable control module 12.

[0069] In this way, voltage conversion can be achieved by setting up only one voltage conversion unit 131, and the power input terminal 20 and the positive bus 31 can be turned on and off, which simplifies the circuit structure of the monitoring management circuit 10 and improves the stability of the monitoring management circuit 10.

[0070] The voltage conversion unit 131 can be a synchronous step-down converter or a power supply chip such as a synchronous Buck converter. For example, the voltage conversion unit 131 can use the RT6361 low-power asynchronous Buck converter or the LM16020 synchronous buck converter. It can be understood that the LMR16020 is a 60V, 2A step-down regulator with an integrated high-side MOSFET. The device has a wide input voltage range of 4.3V to 60V and is suitable for regulating various types of power supplies suitable for medium and non-regulated power supplies from industrial to automotive applications. The RT6361 is a non-synchronous Buck converter using a peak current mode control architecture with a load capacity of 1.5A, an operating voltage range of 4V to 60V, and an output voltage adjustable between 0.8V and VIN.

[0071] In some embodiments, the first power management module 13 includes a voltage conversion unit 131 and a switching unit (not shown in the figure), the voltage conversion unit 131 is connected to the power input terminal 20, and is used to generate a carrier power supply voltage based on the power input voltage; the switching unit is connected to the voltage conversion unit 131, the positive bus 31 and the enable control module 12, and the switching unit is used to turn on when receiving an enable signal so that the voltage conversion unit 131 is connected to the positive bus 31.

[0072] It should be noted that the switching unit can be a switching device such as a triode, a MOS transistor or a relay. For example, in some examples, the switching unit includes a switching transistor, wherein the switching transistor can be a MOS transistor. It can be understood that the MOS transistor has the advantages of high response speed, low power consumption and low driving power. The source of the switching transistor is connected to the voltage conversion unit 131, the drain of the switching transistor is connected to the positive bus 31, and the gate of the switching transistor is connected to the enable control module 12. When the gate of the switching transistor receives an enable signal, the source and drain of the switching transistor are turned on, so that the voltage conversion unit 131 and the positive bus 31 are turned on, and the voltage conversion unit 131 can provide a carrier power supply voltage to the positive bus 31. When the gate of the switching transistor does not receive an enable signal, the source and drain of the switching transistor are turned off, so that the voltage conversion unit 131 and the positive bus 31 are disconnected.

[0073] In this way, the voltage conversion unit 131 and the positive bus 31 are controlled to be turned off by the switch unit, that is, the power input terminal 20 and the positive bus 31 are turned off independently of the normal operation of the system software, thereby reducing the risk while ensuring the speed of turning off the voltage conversion unit 131 and the positive bus 31.

[0074] See also Figure 2 and Figure 3In some embodiments, the monitoring management circuit 10 further includes a reverse connection detection module 14, which is connected to the positive bus 31, the negative bus 32 and the enable control module 12, and is used to detect the wiring status of the bus and generate a reverse connection detection signal according to the wiring status; the enable control module 12 is also used to stop providing an enable signal to the first power management module 13 when the reverse connection detection signal is a high-level signal.

[0075] Specifically, the connection state includes a positive connection state and a reverse connection state, wherein the positive connection state indicates that the connection between the bus and the load device is normal, and the voltage of the positive bus 31 is a positive voltage (flowing from the first power management module 13 to the positive bus 31), and the reverse connection state indicates that the connection between the bus and the load device is abnormal, and the voltage of the positive bus 31 is a reverse voltage (flowing from the positive bus 31 to the first power management module 13). When the connection state is the positive connection state, the reverse connection detection signal output by the reverse connection detection module 14 is a high-level signal (1), and the enable control module 12 provides an enable signal to the first power management module 13 according to the high-level signal, so that the first power management module 13 can provide a carrier power supply voltage to the positive bus 31. When the connection state is the reverse connection state, the reverse connection detection signal output by the reverse connection detection module 14 is a low-level signal (0), and the enable control module 12 stops providing the enable signal to the first power management module 13 according to the low-level signal, so that the first power management module 13 is disconnected from the positive bus 31.

[0076] In this way, by setting the reverse connection detection module 14 , the carrier power supply can be shut down when the connection of the carrier power supply system 100 is abnormal, thereby protecting the safety of the carrier power supply system 100 .

[0077] See also Figure 2 and Figure 3 In some embodiments, the monitoring management circuit 10 further includes a controller 15, which is connected to the current detection module 11 and the enable control module 12. The controller 15 is configured to control the enable control module 12 to provide an enable signal to the first power management module 13 when the overcurrent signal is less than a second preset threshold; or to control the enable control module 12 to provide an enable signal to the first power management module 13 for a preset period of time and then stop providing the enable signal to the first power management module 13 when the overcurrent signal is greater than the second preset threshold and less than the first preset threshold.

[0078] The controller 15 may be a microcontroller unit (MCU). The second preset threshold is smaller than the first preset threshold. The second preset threshold is used to determine whether the carrier power supply system 100 is in an overload operating state. If the overcurrent signal is smaller than the second preset threshold, it indicates that the carrier power supply system 100 is in a normal operating state. If the overcurrent signal is greater than the second preset threshold, it indicates that the carrier power supply system 100 is in an overload operating state.

[0079] The controller 15 may provide a control signal to the enable control module 12 to control whether the enable control module 12 provides the enable signal to the first power management module 13. The control signal may be a level signal. When the control signal is a high level signal, the enable control module 12 is controlled to provide the enable signal to the first power management module 13. When the control signal is a low level signal, the control cabinet controls the enable control module 12 to stop providing the enable signal to the first power management module 13.

[0080] For example, in some examples, the first preset threshold value may be 0.7, and the second preset threshold value may be 0.4. When the overcurrent signal is less than 0.4, indicating that the carrier power supply system 100 is in a normal operating state, the controller 15 is configured to provide a high-level signal to the enable control module 12, thereby controlling the enable control module 12 to provide an enable signal to the first power management module 13. If the overcurrent signal is greater than 0.4 but less than 0.7, the controller 15 provides a high-level signal to the enable control module 12 for a preset duration, and then provides a low-level signal, thereby controlling the first power management module 13 to stop providing the enable signal to the first power management module 13 after providing the enable signal for the preset duration. If the overcurrent signal is greater than 0.7, the controller 15 provides a low-level signal to the enable control module 12, thereby controlling the enable control module 12 to stop providing the enable signal to the first power management module 13.

[0081] In this way, through the setting of the controller 15, when an overcurrent occurs in the positive bus 31, the monitoring management circuit 10 can realize a real-time protection or a delayed adjustment protection function.

[0082] See also Figure 2 and Figure 3 In some embodiments, the monitoring management circuit 10 also includes a second power management module 16, which is connected to the power input terminal 20 and is used to generate a reference voltage based on the power input voltage of the power input terminal 20; the enable control module 12 includes a first enable generation unit 121, and the first enable generation unit 121 includes a first current limiting resistor R21 and a first switching transistor Q1, one end of the first current limiting resistor R21 is connected to the second power management module 16, and the other end of the current limiting resistor is connected to the first power management module 13; the first electrode of the first switching transistor Q1 is connected to the other end of the first current limiting resistor R21, the second electrode of the first switching transistor Q1 is connected to the ground terminal GND, and the control electrode of the first switching transistor Q1 is connected to the current detection module 11.

[0083] The second power management module 16 is used to provide power to other modules or electronic components of the monitoring management circuit 10. The second power management module 16 may include a voltage conversion circuit or a voltage conversion unit 131, etc., which can implement voltage conversion. For example, in some examples, the power input voltage of the power input terminal 20 is 34 volts, and the reference voltage may be 3.3 volts. In this case, the second power management module 16 may be a synchronous buck converter such as the LM16020.

[0084] The first switching transistor Q1 can be a switching device such as a MOS transistor, a transistor, or a relay. For example, in this embodiment, the first switching transistor Q1 is described as an NPN transistor. The first electrode of the first switching transistor Q1 is a collector, the second electrode of the first switching transistor Q1 is an emitter, and the control electrode of the first switching transistor Q1 is a base. The first switching transistor Q1 is turned on when the voltage difference between the control electrode and the second electrode is greater than the turn-on voltage. When the overcurrent signal is greater than a first preset threshold (i.e., when there is an overcurrent or short circuit), the voltage difference between the control electrode and the second electrode of the first switching transistor Q1 is greater than the turn-on voltage, and the first electrode and the second electrode of the first switching transistor Q1 are turned on. In other words, the first switching transistor Q1 is turned on, and the second power management module 16, the first current limiting resistor R21, the first switching transistor Q1, and the ground terminal GND form a loop. The enable input terminal of the first voltage conversion unit 131 is effectively grounded, that is, the first voltage conversion unit 131 does not receive the enable signal. In this case, the first voltage conversion unit 131 stops providing the carrier power supply voltage to the positive bus 31.

[0085] In this way, through the setting of the first switching transistor Q1, when a short circuit or overcurrent occurs in the carrier power supply system 100, a hard shutdown is achieved through the first switching transistor Q1. In this way, it does not rely on the normal operation of the system software, reduces risks and ensures the speed of power shutdown.

[0086] See also Figure 3 In some embodiments, the enable control module 12 includes a second enable generation unit 122, the first enable generation unit 121 includes a second current limiting resistor R22 and a second switching transistor Q2, one end of the second current limiting resistor R22 is connected to the second power management module 16, and the other end of the current limiting resistor is connected to the first power management module 13; the first electrode of the second switching transistor Q2 is connected to the other end of the first current limiting resistor R21 and the other end of the second current limiting resistor R22, the second electrode of the second switching transistor Q2 is connected to the ground terminal GND, and the control electrode of the second switching transistor Q2 is connected to the reverse connection detection module 14 and the controller 15.

[0087] It should be noted that the second switch transistor Q2 can be a switching device such as a MOS tube, a transistor or a relay. For example, in this embodiment, the second switch transistor Q2 is described as a PNP type transistor, wherein the second electrode of the second switch transistor Q2 is a collector, the second electrode of the second switch transistor Q2 is an emitter, and the control electrode of the second switch transistor Q2 is a base. The second switch transistor Q2 is turned on when the potential of the control electrode is low, and is turned off when the potential of the control electrode of the second switch transistor Q2 is high. When the control electrode of the second switch transistor Q2 receives a high-level signal of the reverse connection detection signal output by the reverse connection detection module 14 (i.e., the wiring state is normal) or receives a high-level signal of the control signal output by the controller 15 (i.e., the circuit state is in normal working state), the first electrode and the second electrode of the second switch transistor Q2 are turned off, that is, the second switch transistor Q2 is turned off, and the second power management module 16, the second current limiting resistor R22, and the first power management module 13 form a loop, and the second power management module 16 provides an enable signal to the first power management module 13; when the control electrode of the second switch transistor Q2 receives a high-level signal of the reverse connection detection signal output by the reverse connection detection module 14 (i.e., the wiring state is normal) or receives a high-level signal of the control signal output by the controller 15 (i.e., the circuit state is in normal working state), the first electrode and the second electrode of the second switch transistor Q2 are turned off, that is, the second switch transistor Q2 is turned off, and the second power management module 16, the second current limiting resistor R22, and the first power management module 13 form a loop, and the second power management module 16 provides an enable signal to the first power management module 13; When the reverse connection detection signal output by the detection module 14 is a low-level signal (i.e., the wiring state is abnormal) or the control signal received from the controller 15 is a low-level signal (i.e., overcurrent or overload working state), the first electrode and the second electrode of the second switching transistor Q2 are turned on, that is, the second switching transistor Q2 is turned on, and the second power management module 16, the second switching transistor Q2 and the ground terminal GND form a loop, and the enable input terminal of the second power management module 16 is equivalently grounded, that is, the first voltage conversion unit 131 does not receive the enable signal. At this time, the first voltage conversion unit 131 stops providing the carrier power supply voltage to the positive bus 31.

[0088] See also Figure 3 In some embodiments, the reverse connection detection module 14 includes a third current limiting resistor R41, a first diode D1, a fourth current limiting resistor R42, a fifth current limiting resistor R43 and an optocoupler device IC2, wherein one end of the third current limiting resistor R41 is connected to the positive bus 31, the positive electrode of the first diode D1 is connected to the negative bus 32, and one end of the fourth current limiting resistor R42 is connected to the second power management module 16; one end of the fifth current limiting resistor R43 is connected to the other end of the fourth current limiting resistor R42, and the other end of the fifth current limiting resistor R43 is connected to the enable control module 12; the optocoupler device IC2 includes a first pin 1, a second pin 2, a third pin 3 and a fourth pin 4, the first pin 1 is connected to the cathode of the first diode D1, the second pin 2 is connected to the other end of the third current limiting resistor R41, the third pin 3 is connected to the ground terminal GND, and the fourth pin 4 is connected to the other end of the fourth current limiting resistor R42.

[0089] The third current-limiting resistor R41 may be multiple, for example, two, three, four, or more. In this embodiment, two third current-limiting resistors R41 are used as an example for illustration, and the two third current-limiting resistors R41 can be connected in parallel. In this way, the power consumption of the third current-limiting resistor R41 can be reduced, thereby reducing the rated power of the monitoring and management circuit 10, and at the same time, preventing a single third current-limiting resistor R41 from being damaged due to excessive current.

[0090] When the connection state is positive, the optocoupler IC2 is turned off, and the second power management module 16, the fourth current-limiting resistor R42, the fifth current-limiting resistor R43, and the control electrode of the second switch transistor Q2 of the enable control module 12 are connected. The potential of the control electrode of the second switch transistor Q2 is high, causing the second switch transistor Q2 to be turned off, thereby enabling the reverse connection detection module 14 to provide a high-level signal to the enable control module 12. When the connection state is reverse, the optocoupler IC2 is turned on, and the second power management module 16, the fourth current-limiting resistor R42, the optocoupler IC2, and the ground terminal GND form a closed loop. The potential of the control electrode of the second switch transistor Q2 of the enable control module 12 is low, and the second switch transistor Q2 is turned on, thereby enabling the reverse connection detection module 14 to provide a low-level signal to the enable control module 12.

[0091] See also Figure 3 In some embodiments, the current detection module 11 includes an overcurrent protection resistor R11, which is connected in series to the positive bus 31; the integrated operational amplifier unit 111 is connected to both ends of the overcurrent protection resistor R11 and the enable control module 12, and is used to generate an overcurrent signal according to the voltage across the overcurrent protection resistor R11.

[0092] Specifically, the overcurrent protection resistor R11 can be one or more. In this embodiment, the overcurrent protection resistor R11 can include multiple, for example, two, three, or four or more. For example, in some examples, the overcurrent protection resistor R11 can be described as four, and the four overcurrent protection resistors R11 can be arranged in two parallel and two series. In this way, by providing multiple overcurrent protection resistors R11, the power consumption of the overcurrent protection resistor R11 can be reduced, so that the rated power of the monitoring and management circuit 10 is reduced, and at the same time, damage to a single overcurrent protection resistor R11 due to excessive current is avoided.

[0093] The integrated operational amplifier unit 111 includes a subtractor or a differential amplifier. In this embodiment, the integrated operational amplifier unit 111 can be a differential amplifier. It can be understood that the differential amplifier can adjust the differential gain, thereby adjusting the magnitude of the output value. In this way, the integrated operational amplifier unit 111 can be adapted to different enable control modules 12 or controllers 15. This increases the application range of the integrated operational amplifier unit 111.

[0094] Specifically, the integrated operational amplifier unit 111 includes a first detection resistor R12, a second detection resistor R13, a comparator IC1, a differential amplifier resistor R14, a first grounding resistor R15, and a second grounding resistor R16. One end of the first detection resistor R12 is connected to one end of the overcurrent protection resistor R11; one end of the second detection resistor R13 is connected to the other end of the overcurrent protection resistor R11; the comparator IC1 includes a first input terminal +, a second input terminal -, and an output terminal. The first input terminal + is connected to the other end of the first detection resistor R12, the second input terminal - is connected to the other end of the second detection resistor R13, and the output terminal is connected to the enable control module 12; one end of the differential amplifier resistor R14 is connected to the second input terminal -, and the other end of the differential amplifier resistor R14 is connected to the output terminal; one end of the first grounding resistor R15 is connected to the first input terminal +, and the other end of the first grounding resistor R15 is connected to the ground terminal GND. One end of the second grounding resistor R16 is connected to the output terminal, and the other end is connected to the ground terminal GND.

[0095] In some embodiments, the monitoring management circuit 10 further includes a second diode D2 , wherein the anode of the second diode D2 is connected to the first power management module 13 , and the cathode of the second diode D2 is connected to the positive bus 31 .

[0096] In this way, a reverse voltage on the bus can be avoided from flowing back into the first power management module 13 , thereby protecting the safety of the first power management module 13 .

[0097] Throughout this specification, reference to terms such as "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0098] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A monitoring and management circuit for a carrier power supply system, characterized in that The carrier power supply system includes a power input terminal and a bus, the bus includes a positive bus and a negative bus, and the monitoring management circuit includes: a current detection module, connected to the positive bus, configured to detect the current of the positive bus and generate an overcurrent signal according to the current; an enable control module, connected to the current detection module, configured to generate an enable signal when the overcurrent signal is less than or equal to a first preset threshold, and stop generating the enable signal when the overcurrent signal is greater than the first preset threshold; The first power management module is connected to the power input terminal, the positive bus and the enable control module, and is used to output a carrier power voltage to the positive bus according to the enable signal and the power input voltage provided by the power supply terminal.

2. The monitoring management circuit according to claim 1, characterized in that: The first power management module includes: A voltage conversion unit is respectively connected to the power input terminal, the positive bus and the enable control module, and is used to output the carrier power supply voltage to the positive bus according to the power input voltage when receiving the enable signal from the enable control module.

3. The monitoring management circuit according to claim 1, characterized in that: The first power management module includes: a voltage conversion unit, connected to the power input terminal, and configured to generate the carrier power voltage according to the power input voltage; A switch unit is connected to the voltage conversion unit, the positive bus and the enable control module, and the switch unit is used to be turned on when receiving the enable signal so that the voltage conversion unit is connected to the positive bus.

4. The monitoring management circuit according to claim 1, characterized in that: The monitoring management circuit also includes: a reverse connection detection module connected to the positive bus, the negative bus, and the enable control module, the reverse connection detection module being configured to detect a connection state of the bus and generate a reverse connection detection signal according to the connection state; The enable control module is further configured to stop providing the enable signal to the first power management module when the reverse connection detection signal is a high level signal.

5. The monitoring management circuit according to claim 4, characterized in that: The monitoring management circuit further includes a controller connected to the current detection module and the enable control module, and configured to: When the overcurrent signal is less than a second preset threshold, controlling the enable control module to provide the enable signal to the first power management module; or When the overcurrent signal is greater than the second preset threshold and less than the first preset threshold, the enable control module is controlled to provide the enable signal to the first power management module for a preset period of time and then stop providing the enable signal to the first power management module.

6. The monitoring management circuit according to claim 5, characterized in that: The monitoring management circuit further includes a second power management module, the second power management module being connected to the power input terminal and configured to generate a reference voltage according to the power input voltage of the power input terminal; The enabling control module includes a first enabling generation unit, and the first enabling generation unit includes: a first current limiting resistor, one end of the first current limiting resistor being connected to the second power management module, and the other end of the first current limiting resistor being connected to the first power management module; A first switching transistor, wherein a first electrode of the first switching transistor is connected to the other end of the first current limiting resistor, a second electrode of the first switching transistor is connected to the ground end, and a control electrode of the first switching transistor is connected to the current detection module.

7. The monitoring management circuit according to claim 6, characterized in that: The enabling control module includes a second enabling generation unit, and the first enabling generation unit includes: a second current limiting resistor, one end of the second current limiting resistor being connected to the second power management module, and the other end of the second current limiting resistor being connected to the first power management module; a second switching transistor, wherein a first electrode of the second switching transistor is connected to the other end of the first current limiting resistor and the other end of the second current limiting resistor, a second electrode of the second switching transistor is connected to the ground end, and a control electrode of the second switching transistor is connected to the reverse connection detection module and the controller.

8. The monitoring management circuit according to claim 4, characterized in that: The reverse connection detection module includes: a third current limiting resistor, one end of which is connected to the positive bus; a first diode, wherein an anode of the first diode is connected to the cathode bus; a fourth current limiting resistor, one end of the fourth current limiting resistor being connected to the second power management module; a fifth current limiting resistor, one end of the fifth current limiting resistor being connected to the other end of the fourth current limiting resistor, and the other end of the fifth current limiting resistor being connected to the enable control module; An optocoupler device, the optocoupler device including a first pin, a second pin, a third pin and a fourth pin, the first pin being connected to the cathode of the first diode, the second pin being connected to the other end of the third current-limiting resistor, the third pin being connected to the ground end, and the fourth pin being connected to the other end of the fourth current-limiting resistor.

9. The monitoring management circuit according to claim 1, characterized in that: The current detection module includes: an overcurrent protection resistor connected in series to the positive bus; An integrated operational amplifier unit is connected to both ends of the overcurrent protection resistor and the enable control module, and is used to generate the overcurrent signal according to the voltage across both ends of the overcurrent protection resistor.

10. The monitoring management circuit according to claim 9, characterized in that: The integrated operational amplifier unit includes one of a subtractor and a differential amplifier.

11. The monitoring and management circuit according to claim 9 or 10, characterized in that: The integrated operational amplifier unit comprises: a first detection resistor, one end of the first detection resistor being connected to one end of the overcurrent protection resistor; a second detection resistor, one end of the second detection resistor being connected to the other end of the overcurrent protection resistor; a comparator, comprising a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected to the other end of the first detection resistor, the second input terminal is connected to the other end of the second detection resistor, and the output terminal is connected to the enable control module; a differential amplifier resistor, one end of which is connected to the second input end, and the other end of which is connected to the output end; a first grounding resistor, one end of which is connected to the first input terminal, and the other end of which is connected to the ground terminal; A second grounding resistor has one end connected to the output end and the other end connected to the ground end.

12. The monitoring management circuit according to claim 9, characterized in that: The overcurrent protection resistor includes multiple ones, and the multiple overcurrent protection resistors are connected in parallel.

13. The monitoring management circuit according to claim 1, characterized in that: The monitoring management circuit also includes: A second diode has an anode connected to the first power management module and a cathode connected to the positive bus.

14. A carrier power supply system, characterized in that: The carrier power supply system includes the monitoring and management circuit according to any one of claims 1-13.

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