Monitoring management circuit and carrier power supply system

Abstract

The invention 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] At present, modern industrial control has higher and higher requirements for on-site wiring and communication. Carrier power supply communication is widely used in the building control industry with its simplicity, scalability and easy maintenance. Carrier power supply communication refers to a communication method that uses power lines as communication channels, transmits analog or digital signals through carriers, and uses power lines for power supply at the same time. For example, direct communication between the indoor unit and the wire controller only requires two wires to realize power supply and communication functions.

[0003] However, the power supply solution between the subject and the receiver of carrier-powered communication is not perfect. In scenarios where there are multiple power suppliers and multiple power receivers, wiring short circuits or overcurrent problems often occur. Summary of the invention

[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 management circuit of the embodiment of the present application is used for a carrier power supply system, 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:

[0006] a current detection module, connected to the positive bus, for detecting the current of the positive bus and generating 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 of the enable control module.

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

[0012] A voltage conversion unit, the voltage conversion unit is connected to the power input terminal and is used to generate the carrier power supply 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 is used to detect the 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, the controller is connected to the current detection module and the enabling control module, and the controller is used 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 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 is connected to the power input terminal, and is used to generate a reference voltage according to the power input voltage of the power input terminal; the enable control module includes a first enable generation unit, and the first enable generation unit includes:

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

[0022] A first switch transistor, wherein a first electrode of the first switch transistor is connected to the other end of the first current limiting resistor, a second electrode of the first switch transistor is connected to a ground terminal, and a control electrode of the first switch 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 is connected to the second power management module, and the other end of the second current limiting resistor is connected to the first power management module;

[0025] A second switch transistor, wherein a first electrode of the second switch transistor is connected to the other end of the second current limiting resistor, a second electrode of the second switch transistor is connected to the ground end, and a control electrode of the second switch 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 which is 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 enabling control module;

[0031] An optocoupler device, the optocoupler device includes a first pin, a second pin, a third pin and a fourth pin, the first pin is connected to the cathode of the first diode, the second pin is connected to the other end of the third current limiting resistor, the third pin is connected to the ground terminal, and the fourth pin is 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 the two ends of the overcurrent protection resistor and the enable control module, and is used to generate the overcurrent signal according to the voltage across the two ends of the overcurrent protection resistor.

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

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

[0037] A first detection resistor, one end of which is connected to one end of the overcurrent protection resistor;

[0038] A second detection resistor, one end of which is 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 implementation mode of the present application includes the monitoring management circuit of any one of the above implementation modes.

[0047] In the monitoring management circuit and carrier power supply system of the implementation mode 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 apparent from the description below, or will be learned through the 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 implementation mode of the present application.

[0051] Figure 2 It is another module schematic diagram of the carrier power supply system of the implementation mode 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 switch transistor, 122-second enable generation unit, R22-second current limiting resistor, Q2-second switching transistor, 13-first power management module, 131-voltage conversion unit, 14-reverse detection module, R41-third current limiting resistor, D1-first diode, R42-fourth current limiting resistor, R45-fifth current limiting resistor, IC2-optical coupler, 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 cannot be understood as limiting the present application.

[0056] As modern industrial control has higher and higher requirements for on-site wiring and communication, carrier power supply communication is widely used in the building control industry with its simplicity, scalability and easy maintenance. According to different communication protocols, the current carrier communication includes Home bus carrier communication, 485 carrier communication, KNX carrier communication, etc.

[0057] Usually, communication chip manufacturers only provide communication solutions, but their power supply solutions between the subject and the recipient of carrier-powered communication are not perfect. When there are multiple power supply bodies and multiple power recipients in the application wiring scenario, if one or several devices have abnormal conditions such as short circuit, 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 circuit occur on other bus devices, this will cause the short-circuit loop to still exist, and the short-circuit protection function cannot be implemented normally. At the same time, the loop shutdown relies on chip control, and when an abnormality occurs, it cannot be shut down in time and effectively.

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

[0059] The monitoring 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 according to 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 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 according to the enable signal and the power input voltage provided by the power supply terminal.

[0060] In the carrier power supply system 100 and the monitoring management circuit 10 of the implementation mode 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 wire controller and an indoor unit, wherein the wire controller serves as a power supply device for the indoor unit, and the indoor unit serves as a load device. The wire controller and the indoor unit can be connected through a positive bus 31 and a negative bus 32, so that the wire 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 management circuit 10 electrically connected to the power input terminal 20, wherein the power input terminal 20 may be a power supply of the power supply device, capable of outputting a power input voltage, and the power input voltage may be 34 volts. The monitoring management circuit 10 is connected to the load device through a positive bus 31 and a negative bus 32 to form a loop. The monitoring management circuit 10 can convert the power input voltage into a carrier power voltage required by the load device, and transmit it to the load device through the positive bus 31 to power the load device.

[0065] The monitoring management circuit 10 includes a current detection module 11, an enabling control module 12 and a first power management module 13. Among them, the current detection module 11 can be connected to the positive bus 31, and the overcurrent signal is positively correlated with the current of the positive bus 31, that is, the larger the current of the positive bus 31, the larger the overcurrent signal. Therefore, the current of the positive bus 31 can be judged by the overcurrent signal, thereby determining whether there is a short circuit or overcurrent phenomenon in the carrier power supply system 100.

[0066] The enable control module 12 is connected to the current detection module 11, and the first power management module 13 is respectively connected to the power input terminal 20 and the positive bus 31. The enable control module 12 is used to generate an enable signal when the overcurrent signal is less than or equal to the first preset threshold value, and input it to the first power management module 13, so that the first power management module 13 converts the power input voltage of the power input terminal 20 into a carrier power voltage according to the enable signal and outputs it to the positive bus 31. The enable control module 12 is also used to stop generating the enable signal when the overcurrent signal is greater than the first preset threshold value, so that the first power management module 13 stops converting the power input voltage of the power input terminal 20 into a carrier power voltage.

[0067] It should be noted that the first preset threshold is a value set by the monitoring management circuit 10 for determining 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 a short circuit or overcurrent occurs in the carrier power supply system 100, 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 achieving the protection of the carrier power supply system 100 when the monitoring management circuit 10 is in an abnormal state.

[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 only one voltage conversion unit 131, and the on-off of the power input terminal 20 and the positive bus 31 can be achieved, 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 buck converter or a power 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 buck 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 supply suitable for medium and non-regulated power supplies from industry to automobiles. The RT6361 is an asynchronous 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 according to 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 be turned on when an enable signal is received so that the voltage conversion unit 131 is connected to the positive bus 31.

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

[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 also includes a controller 15, which is connected to the current detection module 11 and the enable control module 12. The controller 15 is used 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 the second preset threshold; or when the overcurrent signal is greater than the second preset threshold and less than the first preset threshold, control the enable control module 12 to provide the 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.

[0078] The controller 15 may be a microcontroller unit (MCU). The second preset threshold is less than the first preset threshold, and the second preset threshold is used to determine whether the carrier power supply system 100 is in an overload working state. If the overcurrent signal is less than the second preset threshold, it indicates that it is in a normal working state. If the overcurrent signal is greater than the second preset threshold, it indicates that it is in an overload working 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 an 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 an 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. The controller 15 is used to provide a high level signal to the enable control module 12 when the overcurrent signal is less than 0.4, indicating that the carrier power supply system 100 is in a normal working state, so as to control 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 and less than 0.7, after providing a high level signal of a preset duration to the enable control module 12, a low level signal is provided, so as to control 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, a low level signal is provided to the enable control module 12, so as to control 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 according to 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 supply power to other modules or electronic components of the monitoring management circuit 10. The second power management module 16 may include a circuit that can implement voltage conversion, such as a voltage conversion circuit or a voltage conversion unit 131. 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, then the second power management module 16 may be a synchronous buck converter of model LM16020.

[0084] The first switch transistor Q1 can be a switch device such as a MOS tube, a triode or a relay. For example, in this embodiment, the first switch transistor Q1 is described by taking an NPN type triode as an example. The first electrode of the first switch transistor Q1 is a collector, the second electrode of the first switch transistor Q1 is an emitter, and the control electrode of the first switch transistor Q1 is a base. The first switch 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 the first preset threshold (i.e., overcurrent or short circuit), the differential voltage between the control electrode and the second electrode of the first switch transistor Q1 is greater than the turn-on voltage, then the first electrode and the second electrode of the first switch transistor Q1 are turned on, that is, the first switch transistor Q1 is turned on, the second power management module 16, the first current limiting resistor R21, the first switch transistor Q1 and the ground terminal GND form a loop, and the enable input terminal of the first voltage conversion unit 131 is equivalent to grounding, 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.

[0085] Thus, by setting the first switch transistor Q1, when a short circuit or overcurrent occurs in the carrier power supply system 100, hard shutdown is achieved through the first switch transistor Q1. Thus, it is not dependent on the normal operation of the system software, reducing the risk while ensuring 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 switch device such as a MOS tube, a triode or a relay. For example, in this embodiment, the second switch transistor Q2 is described by taking a PNP type triode as an example, 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. It is turned on when the potential of the control electrode of the second switch transistor Q2 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 reverse connection detection signal output by the reverse connection detection module 14 as a high-level signal (i.e., the wiring state is normal) or receives a control signal output by the controller 15 as a high-level signal (i.e., the circuit state is in a 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 for the first power management module 13; when the control electrode of the second switch transistor Q2 receives a reverse connection detection signal output by the reverse connection detection module 14 as a high-level signal (i.e., the wiring state is normal) or receives a control signal output by the controller 15 as a high-level signal (i.e., the circuit state is in a 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 for the first power management module 13; When the reverse connection detection signal output by the 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 equivalent to 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 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 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 negative electrode 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] Among them, the third current limiting resistor R41 can be multiple, for example, it can be 2, 3 or 4 or more. In this embodiment, the third current limiting resistor R41 can be described by taking 2 as an example, and the 2 third current limiting resistors R41 can be set in parallel. In this way, the power consumption of the third current limiting resistor R41 can be reduced to reduce the rated power of the monitoring management circuit 10, and at the same time, the single third current limiting resistor R41 is prevented from being damaged due to excessive current.

[0090] When the connection state is positive connection, the optocoupler device 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, and the potential of the control electrode of the second switch transistor Q2 is high, so that the second switch transistor Q2 is turned off, that is, the reverse connection detection module 14 provides a high-level signal to the enable control module 12. When the connection state is reverse connection, the optocoupler device IC2 is turned on, and the second power management module 16, the fourth current limiting resistor R42, the optocoupler device IC2 and the ground terminal GND form a closed loop, and 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, that is, the reverse connection detection module 14 provides 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 connects the two 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 two ends of the overcurrent protection resistor R11.

[0092] Specifically, the overcurrent protection resistor R11 may be one or more. In this embodiment, the overcurrent protection resistor R11 may include multiple, for example, 2, 3 or 4 or more. For example, in some examples, the overcurrent protection resistor R11 may be described by taking 4 as an example, and the 4 overcurrent protection resistors R11 may be set in two parallel and two series. In this way, by setting 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 management circuit 10 is reduced, and at the same time, the damage of 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 size of the output value, so that the integrated operational amplifier unit 111 can be adapted to different enabling control modules 12 or controllers 15. The application range of the integrated operational amplifier unit 111 is improved.

[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 enabling 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 an anode of the second diode D2 is connected to the first power management module 13 , and a cathode of the second diode D2 is connected to the positive bus 31 .

[0096] In this way, it is possible to prevent the reverse voltage on the bus from flowing back into the first power management module 13 , thereby protecting the safety of the first power management module 13 .

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[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 spirit 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 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, for detecting the current of the positive bus and generating 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 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 is used to detect the 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, which is connected to the current detection module and the enabling control module, and is used for: 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 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 is connected to the power input terminal, and is used 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 is connected to the second power management module, and the other end of the first current limiting resistor is connected to the first power management module; A first switch transistor, wherein a first electrode of the first switch transistor is connected to the other end of the first current limiting resistor, a second electrode of the first switch transistor is connected to a ground terminal, and a control electrode of the first switch 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 is connected to the second power management module, and the other end of the second current limiting resistor is 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 terminal, 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 comprises: 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 which is 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 enabling control module; An optocoupler device, the optocoupler device includes a first pin, a second pin, a third pin and a fourth pin, the first pin is connected to the cathode of the first diode, the second pin is connected to the other end of the third current limiting resistor, the third pin is connected to the ground terminal, and the fourth pin is 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 comprises: An overcurrent protection resistor, connected in series to the positive bus; An integrated operational amplifier unit is connected to the two ends of the overcurrent protection resistor and the enable control module, and is used to generate the overcurrent signal according to the voltage across the two 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 management circuit according to claim 9 or 10, characterized in that: The integrated operational amplifier unit comprises: A first detection resistor, one end of which is connected to one end of the overcurrent protection resistor; A second detection resistor, one end of which is 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 comprises the monitoring and management circuit described in any one of claims 1-13.

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