Fan heat dissipation device for N-out-M framework vehicle-mounted equipment

Abstract

The invention relates to a fan heat dissipation device for N-out-of-M framework vehicle-mounted equipment, which is characterized in that a set of fan disc is arranged at each of the top and the bottom of a vehicle-mounted equipment machine cage, N fans are mounted in each set of fan disc, and heat dissipation is performed on N completely independent channels; the fan corresponding to each channel is independent, and the two fans of each channel are powered by the channel and the adjacent channel respectively to form redundant configuration, = M and Mgt; 1 and M are the number of actual operation channels. Compared with the prior art, the method has the advantages that fan redundancy configuration is achieved, the stability and usability of heat dissipation are improved, and channel work abnormity and descending caused by the heat dissipation problem are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of fan heat dissipation for vehicle-mounted equipment, and in particular to a fan heat dissipation device for an N-out-of-M architecture vehicle-mounted equipment. Background Art

[0002] As traffic pressure continues to increase across the country, the requirements for the rail transit industry and its equipment are also increasing. In the context of increasing rail transit capacity and reducing operating distances, the hardware computing and processing capabilities of rail transit on-board control equipment also need to be continuously enhanced. Enhancing hardware computing and processing capabilities will inevitably lead to a significant increase in equipment power consumption and heat generation. In order to ensure that the on-board equipment can operate stably, it is necessary to operate in an environment as close to room temperature as possible. Due to the limitations of vehicle space, on-board equipment is often installed in a small space with relatively poor ventilation and heat dissipation. Therefore, the cooling system of the on-board equipment itself is particularly important, which must ensure that the heat can be discharged quickly and the cooling system must operate reliably and stably.

[0003] Taking the commonly used three-out-of-two equipment in the N-out-of-M architecture as an example, the heat dissipation of the three channels in the on-board cage is generally to set a single fan at the bottom of the cage, and the fan of this channel is powered by this channel. If the fan of this channel fails, it will affect the heat dissipation of this channel, causing the ambient temperature in this channel to rise, and eventually exceed the operating range of the equipment. A further approach is to increase the monitoring of the fan operation status. Once the fan system is abnormal, the channel will be closed by automatic shutdown or manual intervention to avoid accidents caused by high temperature. However, this method causes a single channel to be unavailable due to a single fan failure, and the system enters a degraded mode, changing from three-out-of-two to two-out-of-two mode. Due to the particularity of the rail transit industry, it is necessary to ensure stable operation as much as possible to avoid operating terminals. If the equipment can still maintain operation with the remaining two channels, it is generally not allowed to repair the faulty channel immediately, and maintenance is required after the operation is completely completed. Therefore, the entire on-board equipment will continue to operate in the degraded mode for a long period of time. If any type of failure occurs in other channels at this time, the entire system will be unavailable, causing rail transit delays, suspensions, etc., which will have a significant impact on the availability and reliability of the entire rail transit signal system. In fact, the equipment in the channel where the fan fails can work normally. If normal operation can be maintained, the above situation can be avoided.

[0004] How to achieve the stability of fan heat dissipation of N-out-of-M architecture vehicle-mounted equipment has become a technical problem that needs to be solved. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a fan heat dissipation device for N-to-M architecture vehicle-mounted equipment.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, a fan cooling device for an N-out-of-M architecture vehicle-mounted equipment is provided, wherein a set of fan trays are arranged at the top and bottom of the vehicle-mounted equipment cage, respectively, and each set of the fan trays is equipped with N fans for cooling N completely independent channels; the fans corresponding to each channel are independent, and the two fans of each channel are powered by the current channel and the adjacent channel respectively, forming a redundant configuration, wherein N>=M and M>1, and M is the number of actual operating channels.

[0008] Preferably, each of the channels has an independent external power supply, and the external power supply is connected to a fan power supply monitoring module on each channel board, and the fan power supply monitoring module is used to supply power to the fan.

[0009] More preferably, the fan power supply monitoring module receives a rotation speed signal sent back by the fan and transmits it to a processing unit on the board for monitoring the status of the fan.

[0010] More preferably, the board of each channel includes two fan power supply monitoring modules, which are respectively connected to a fan in its own channel and a fan in a different fan disk of an adjacent channel. The module supplies power to the connected fans and receives signals sent back from the fan status.

[0011] More preferably, the two fan power supply monitoring modules in the same channel are respectively connected to the bottom fan of the own channel and the top fan of the adjacent channel.

[0012] More preferably, the fan power supply monitoring module includes an isolated power supply unit, a power supply control output unit and a fan monitoring unit; the power supply control output unit and the fan monitoring unit are respectively connected to the fan; and the other end of the power supply control output unit is connected to the isolated power supply unit.

[0013] More preferably, the isolated power supply unit isolates the power supply input from the outside of the channel into two independent power supplies, and outputs them to the power supply control unit for use, wherein one power supply is connected to the top fan of the adjacent channel, and the other is connected to the bottom fan of the channel.

[0014] More preferably, inside the power control unit, the power output by the isolated power supply unit is first connected to a fuse for overcurrent and short-circuit protection, then passes through the normally open contacts of a relay, and then connected to an inductor and a capacitor for filtering and anti-interference, and finally provides power for the fan.

[0015] More preferably, the relay isolates the fan power supply circuit from the internal control circuit of the board and then provides power to the fan.

[0016] More preferably, the coil of the relay is controlled by a fan control signal on the board.

[0017] More preferably, the fan monitoring unit is used to transmit the received fan status signal to the processing unit on the board for processing to finally obtain the rotation speed information of the board, wherein the fan status signal is a pulse signal within a certain frequency range generated by the rotation of the fan.

[0018] More preferably, the fan status signal is firstly subjected to high-frequency filtering by an inductor, and then divided by a resistor and subjected to low-frequency filtering, and then sent to an optocoupler isolator to isolate the signal, and then an internal signal is generated and handed over to the processing unit for processing.

[0019] More preferably, when the external power supply corresponding to a channel fails, only two fans connected to it stop running, where the two fans are a fan of the channel and a fan of a different fan disk of an adjacent channel, and the other fan of the adjacent channel and the fans of other channels are not affected.

[0020] More preferably, when the isolated power supply unit or the power supply control unit partially fails or the fan monitoring unit fails, only the operation of one fan connected thereto will be affected.

[0021] More preferably, the fan monitoring unit generates an alarm message when monitoring that the fan speed is lower than a threshold.

[0022] Preferably, N=3 and M=2, or N=5 and M=3.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) The present invention adopts two sets of fan trays at the top and bottom. The N fans installed inside each set of fan trays are respectively N completely independent channels for heat dissipation; the fans corresponding to each channel are independent, and the two fans of each channel are respectively powered by the channel and the adjacent channel to form a redundant configuration, so as to avoid the heat dissipation of the entire channel being affected by the failure of one fan, thereby improving the stability and availability of fan heat dissipation.

[0025] 2) The two fan control modules in each channel of the present invention respectively power the fans at the bottom of the channel and the top of the adjacent channel, thereby avoiding the situation where the top and bottom fans of a channel fail at the same time due to a common mode failure, effectively ensuring the heat dissipation of the channel and avoiding abnormal operation and degradation of the channel caused by heat dissipation problems.

[0026] 3) The isolated power supply, power control output and fan monitoring unit in the fan power supply monitoring module of the present invention are all equipped with protection measures, taking into account the device's own failure, over-voltage and under-voltage protection, load short circuit, overcurrent protection, and the power interface circuit's protection against possible external interference. Isolation is performed to prevent other functions of the board from being affected, thereby reducing systemic failures of the vehicle-mounted system when used on site.

[0027] 4) The device of the present invention has strong expansion and adaptation characteristics. On the premise of ensuring two independent fan power supply monitoring modules on the board and the fan power supply monitoring modules are connected to themselves and the adjacent channel fans respectively, it can be used in any N-out-of-M mode, including a degraded two-out-of-two mode, a more complex five-out-of-three mode and other modes.

[0028] 5) In the present invention, when the fan speed is monitored to be lower than a threshold, a fan alarm is triggered. When only one fan in a channel triggers an alarm, the other fan in the channel still operates normally, and the normal heat dissipation of the channel is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the arrangement of the vehicle-mounted equipment and redundant cooling fan trays of the three-out-of-two architecture in the present invention;

[0030] Figure 2 This is a schematic diagram of the three-channel internal board, fan power supply monitoring module and fan in the present invention;

[0031] Figure 3 This is a schematic diagram of the principle of the isolated power supply unit of the fan power supply monitoring module in the present invention;

[0032] Figure 4 This is a schematic diagram of the power control unit of the fan power supply monitoring module in the present invention;

[0033] Figure 5 A schematic diagram showing the principle of a fan monitoring unit of a fan power supply monitoring module in the present invention;

[0034] Figure 6 This is a schematic diagram of the connection between the fan power supply monitoring module and the fan in the present invention;

[0035] Figure 7 The structure of the fan power supply monitoring module of the present invention and the schematic diagram of connecting the fan;

[0036] Figure 8 It is a schematic diagram of the structure of the fan heat dissipation device of the N-out-of-M architecture vehicle-mounted equipment in the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0038] The technical solution of the present invention is an on-board device for a rail transit signal system. Taking the commonly used on-board device of three-out-of-two architecture as an example, the three independent channels of the on-board device are used for external I / O and calculation. When each channel receives the input and completes the calculation, the calculation results of the three channels will be compared. When the three results are completely consistent or any two of them are consistent, the consistent calculation result is recognized and output. According to the requirements of the safety equipment design, the channel where the inconsistency occurs has been identified as untrustworthy and will be isolated first. It can only be put back into use after waiting for subsequent re-inspection and confirmation. At this time, the device enters a two-out-of-two working mode. At the same time, in addition to the abnormal calculation results of the above-mentioned channels, other software and hardware failures that cause the channel to work abnormally or not work will cause this channel to be isolated. The remaining two channels form a two-out-of-two mode to continue to operate. Since the re-inspection process requires three communications to be carried out simultaneously, it will definitely interrupt the normal operation of the equipment. Therefore, at present, each rail transit operating unit will not perform this operation in normal operation devices, and usually perform this operation after the end of night operation. After a channel is isolated and the system is restored after the operation is finished, the device maintains a two-out-of-two mode of operation. At this time, the results of the two channels must be completely consistent to be considered acceptable by the system. If any abnormality occurs in any channel at this time, the entire device will be completely unavailable, and vehicles, sections or entire lines will be delayed or shut down at the operation site. The purpose of the present invention is to avoid the heat dissipation caused by the failure of the fan itself or the fan power supply when a channel itself is in a normal state, so that the channel that can operate normally is forced to stop and isolate.

[0039] The design architecture of the present invention adopts two sets of upper and lower fan systems to provide redundant heat dissipation services for N channels. At the same time, the fans corresponding to the N channels are independent of each other. The upper and lower fans are powered by the current channel and the adjacent channel respectively, and the fan status is transmitted back to ensure that in several different types of failure modes, the current channel can still ensure that the fan continues to work and provide reliable heat dissipation function.

[0040] This embodiment relates to a fan heat dissipation device for an N-to-M architecture vehicle-mounted device, such as Figure 8As shown. The vehicle-mounted equipment in the middle uses a standard cage that is 19 inches wide and 6U high. The cage is equipped with equipment for N completely independent channels. Each channel includes two independent fan power supply monitoring modules. A set of fan trays are arranged at the top and bottom of the cage respectively. Each set of fan trays is equipped with N fans for heat dissipation for N completely independent channels. The fans corresponding to each channel are independent, and the two fans of each channel are powered by the channel and the adjacent channel respectively, forming a redundant configuration.

[0041] Each channel has an independent external power supply, which is connected to the fan power supply monitoring module on each channel board. The fan power supply monitoring module is used to supply power to the fan, receive the speed signal sent back by the fan and transmit it to the processing unit on the board to monitor the status of the fan.

[0042] Two fan power supply monitoring modules in the same channel are respectively connected to the bottom fan of the own channel and the top fan of the adjacent channel.

[0043] The fan heat dissipation device of the present invention is not only applicable to vehicle-mounted devices with a three-out-of-two architecture, but also applicable to various modes of architecture, such as a degraded two-out-of-two mode, a more complex five-out-of-three mode, and other modes, provided that two independent fan power supply monitoring modules on the board are ensured, and the fan power supply monitoring modules are respectively connected to the fans of the adjacent channels. That is, it can be considered that the system and equipment with an N-out-of-M (N>=M, M>1) architecture are applicable.

[0044] The following uses a commonly used three-out-of-two architecture device as an example to explain in detail.

[0045] like Figure 1 The arrangement of the three-out-of-two architecture equipment and redundant cooling fan trays is shown. The vehicle-mounted equipment in the middle adopts a standard cage with a width of 19 inches and a height of 6U. Equipment with three channels is arranged in the cage: channel A in the three-out-of-two architecture, channel B in the three-out-of-two architecture, and channel C in the three-out-of-two architecture, hereinafter referred to as channel A, channel B, and channel C. Each channel contains 6U high boards of the same model and quantity, and each channel can achieve exactly the same function through the combination of the boards in the channel. At the same time, the three channels are completely independent of each other, and there is no non-isolated physical connection inside the cage. At the same time, the three channels have their own dedicated external power supply modules, and the three external power supply modules are also completely independent. The present invention arranges fan trays at the top and bottom of the cage to form a redundant fan arrangement, providing reliability and robustness of the cooling system. Three fans are installed in each of the two fan trays to dissipate heat for the three channels.

[0046] The card model and quantity in each channel will be adjusted according to different business needs. Figure 2 Take the settings in as an example to illustrate:

[0047] There are three boards in channel A: board 1_A, board 2_A, board 3_A

[0048] There are three boards in channel B: board 1_B, board 2_B, board 3_B

[0049] There are three boards in channel C: board 1_C, board 2_C, board 3_C

[0050] Regardless of the board combination selected, each channel must have a board containing a fan power supply monitoring module, that is, Figure 2 Board 1_A, Board 1_B and Board 1_C. Fan power supply monitoring module (such as Figure 2 The fan power supply monitoring module can be used as one of the functional modules of the three boards. It does not need to set up a special board to provide only the fan power supply monitoring function, which can help improve the integration of the board. At the same time, the power supply monitoring module itself also has a protection design to protect against external impacts; it also has an isolation design to ensure that faults on the fan path will not spread to other functional modules of the board.

[0051] The fan power supply monitoring module on board 1_A, board 1_B and board 1_C includes three units: an isolated power supply, a power control output unit and a fan monitoring unit. Figure 7 The power control output unit and the fan monitoring unit are connected to the fan respectively, and the other end of the power control output unit is connected to the isolated power supply.

[0052] Figure 3 Schematic diagram of the circuit principle of the isolated power supply in the fan power supply monitoring module. The isolated power supply unit is used to isolate the VCC_24V input externally of this channel into two independent channels, VCC_24V_ISO1 and VCC_24V_ISO2. VCC_24V_ISO1 is connected to the top fan of the adjacent channel, and VCC_24V_ISO2 is connected to the bottom fan of this channel.

[0053] Generally, the power of a single fan is not more than 5 watts. Based on the 50% derating consideration, an isolated power module with a rated output power of 10 watts or other power that meets the derating requirements can be selected. At the same time, the isolation voltage in DC mode must be greater than or equal to 1000VDC. Over- and under-voltage protection is met by the functions of the isolated power module itself. The capacitors C1, C2, C3, and C4 at the input and output ends of the isolation module play the role of energy storage and filtering. Depending on the selected isolated power module, the capacitance value is generally selected from uF to nF. After passing through the two isolated power supplies, two independent power supplies VCC_24V_ISO1 and VCC_24V_ISO2 are separated for use by the power control unit.

[0054] Figure 4 This is a schematic diagram of the output part of the power control unit. The relay is mainly used to isolate the fan power supply circuit from the internal control circuit of the board. The VCC_24V_ISO1 and VCC_24V_ISO2 output by the isolated power module enter the power control unit. First, the fuses F1 and F2 are connected for overcurrent and short-circuit protection. When overcurrent and short circuit occur at the fan end, the fuses can be blown to protect it. After that, through the normally open contacts of relays K1 and K2, the relay coil is controlled by the fan control signal FAN_CTRL on the board. In this way, any fault in the fan power supply path can be prevented from affecting the inside of the board through the connection of FAN_CTRL, and other normal functions of the board can be prevented from being damaged. The subsequent L1, L2 inductors and C5, C6 capacitors all play a role in filtering and anti-interference. Finally, the power output FAN1_24V and FAN2_24V are provided for the fan.

[0055] Figure 5 The schematic diagram of the circuit principle of the fan monitoring unit. The fan monitoring unit is used to transmit the fan status signal to the processing unit on the board, such as CPLD (Complex Programmable Logic Device) or FPGA for processing, and finally obtain the speed information of the board. The fan status signal SPEED_FAN is a pulse signal within a certain frequency range generated by the fan rotation. First, it is high-frequency filtered by inductors L3 and L4, and then divided by resistors R2 and R3 and low-frequency filtered before being sent to the optocoupler isolator. High and low frequency filtering can effectively filter out the interference of external clutter on the signal. D1 is a TVS tube, which is used to suppress external conductive electromagnetic interference. The fan status signal generates an internal signal FAN_SIGNAL after passing through the optocoupler isolator, which is processed by CPLD or FPGA. The optocoupler isolator effectively isolates the signal to prevent external impact from affecting the inside of the board through the FAN_SIGNAL connection.

[0056] After clarifying the function of the fan power supply monitoring module, we will continue to explain that there are two fan power supply monitoring modules on each board 1_A, board 1_B, and board 1_C. The connection relationship between each fan is as follows:

[0057] Connect VCC_FAN1_B on board 1_A to FAN1_B;

[0058] Connect VCC_FAN2_A on board 1_A to FAN2_A;

[0059] Connect VCC_FAN1_C to FAN1_C on board 1_B;

[0060] Connect VCC_FAN2_B on board 1_B to FAN2_B;

[0061] Connect VCC_FAN1_A on board 1_C to FAN1_A;

[0062] Connect VCC_FAN2_C to FAN2_C on board 1_C.

[0063] The VCC_FANX_Y (X is 1 or 2, Y is A, B or C) on each board here is the same module. The different numbers are mainly for the convenience of matching and identifying the fans.

[0064] From the description of the connection, we can see that the fan power supply monitoring module on each board is connected to the bottom fan of its own channel and the top fan of the adjacent channel respectively. This connection includes the power supply provided by the module to the fan and the signal that the fan sends back the status.

[0065] In order to display the connection more intuitively, Figure 6 Board 1_A is used as an example and the connections are added for easier reading. Figure 6 For example, VCC_FAN1_B on card 1_A in channel A is connected to FAN1_B in channel B, and VCC_FAN2_A in channel A is connected to FAN2_A in this channel. This connection design can effectively avoid and mitigate the following fault conditions:

[0066] 1. When the external unified power supply VCC_24V of channel A fails, fans FAN2_A and FAN1_B stop running, but channel B and channel C are completely independent of channel A. As long as their fan power supply is normal, the FAN1_A fan of channel A and the FAN2_B fan of channel B can work normally without affecting the heat dissipation of channel A and channel B. The three channels are normal and still work in three-out-of-two mode.

[0067] 2. When the isolated power supply fails, resulting in no output in one of VCC_24V_ISO1 or VCC_24V_ISO2, only the bottom fan of the channel or the top fan of the adjacent channel will fail, and the affected channel can still maintain the normal operation of the other fan without affecting its heat dissipation. At the same time, due to the protection of the isolated power supply module, it will not affect the external unified input VCC_24V, that is, it will not affect another fan using the same external input.

[0068] 3. When the output part of the power control unit fails, resulting in no output of FAN1_24V or FAN2_24V, it will only cause the bottom fan of this channel or the top fan of the adjacent channel to fail. The affected channel can still maintain the normal operation of the other fan and will not affect its heat dissipation. In addition, the over-voltage and under-voltage protection of the isolation power module itself and the over-current protection design of the fuse of the power control output part ensure that the fault will not affect the external unified input VCC_24V, that is, it will not affect another fan using the same external input of this channel. At the same time, since a relay is used to control the fan power supply, the fault will not be transmitted to the inside of the board through FAN_CTRL, thereby affecting the normal operation of other functions of the board.

[0069] 4. The fan itself fails. Common fan failures can be classified into three main states based on the results:

[0070] a) Aging or failure of the fan coil causes an internal short circuit in the coil, increasing the current. For this type of failure, the fuse in the power control output part will blow, stopping the continuous power supply to the fan. At this time, only the fan at the bottom of the channel or the top of the adjacent channel will stop working, and the fan at the other end of the channel can still work normally, without affecting the heat dissipation.

[0071] b) The fan speed decreases or stops due to aging. The failure mode of this type of failure is generally gradual deceleration until it stops. The whole process takes a long time. The fan can be monitored by the fan monitoring unit, and an alarm is generated when the speed is lower than a certain threshold. Due to the slow progress of this type of failure, there is usually enough time to wait for the operation to end and then take corresponding measures. At the same time, due to the individual differences of each fan, and the different effects of the top and bottom operating environments (such as temperature, humidity, dust, etc.) on the fan life, there is only a very small probability that the top and bottom fans will trigger alarms at the same time, so the heat dissipation of the channel can also be guaranteed to be normal.

[0072] c) Other unexpected events (such as foreign matter entering, blade breakage, etc.) cause the fan to rotate abnormally or stop. This type of fault and the second state above are handled through fan monitoring and corresponding processing mechanisms. Since this type of fault is a random fault, the two fans in the same channel are arranged separately, so it will not become a common cause to affect both fans at the same time, nor will it affect the heat dissipation of the channel.

[0073] 5. When the fan monitoring unit fails, the error FAN_SIGNAL will trigger the fan alarm, but the fan at the other end of the channel is still working normally and will not affect the heat dissipation of the channel. At the same time, the use of optical couplers for signal isolation can prevent external impacts on the inside of the board.

[0074] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A fan heat dissipation device for an N-out-of-M architecture vehicle-mounted device, characterized in that: The device arranges a set of fan trays at the top and bottom of the vehicle-mounted equipment cage respectively. Each set of fan trays is equipped with N fans for heat dissipation for N completely independent channels. The fans corresponding to each channel are independent of each other, and the two fans of each channel are powered by the channel and the adjacent channel respectively, forming a redundant configuration, where N>=M and M>1, and M is the number of actual operating channels.

2. A fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 1, characterized in that: Each of the channels has an independent external power supply, and the external power supply is connected to a fan power supply monitoring module on each channel board, and the fan power supply monitoring module is used to supply power to the fan.

3. A fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 2, characterized in that: The fan power supply monitoring module receives the rotation speed signal sent back by the fan and transmits it to the processing unit on the board to monitor the status of the fan.

4. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 2, characterized in that: The board of each channel includes two fan power supply monitoring modules, which are respectively connected to a fan in its own channel and a fan in a different fan disk of an adjacent channel. The module supplies power to the connected fans and receives signals sent back from the fan status.

5. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 4, characterized in that: The two fan power supply monitoring modules in the same channel are respectively connected to the bottom fan of the own channel and the top fan of the adjacent channel.

6. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 4, characterized in that: The fan power supply monitoring module includes an isolated power supply unit, a power control output unit and a fan monitoring unit; the power control output unit and the fan monitoring unit are connected to the fan respectively; the other end of the power control output unit is connected to the isolated power supply unit.

7. A fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 6, characterized in that: The isolated power supply unit isolates the power supply input from the outside of the channel into two independent power supplies, and outputs them to the power supply control unit for use, wherein one power supply is connected to the top fan of the adjacent channel, and the other power supply is connected to the bottom fan of the channel.

8. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 6, characterized in that: Inside the power control unit, the power output by the isolated power supply unit is first connected to a fuse for overcurrent and short circuit protection, then passes through the normally open contacts of a relay, and then connected to an inductor and a capacitor for filtering and anti-interference, and finally provides power for the fan.

9. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 8, characterized in that: The relay isolates the fan power supply circuit from the internal control circuit of the board and then provides power to the fan.

10. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 8, characterized in that: The coil of the relay is controlled by the fan control signal on the board.

11. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 6, characterized in that: The fan monitoring unit is used to transmit the received fan status signal to the processing unit on the board for processing to finally obtain the rotation speed information of the board, wherein the fan status signal is a pulse signal within a certain frequency range generated by the rotation of the fan.

12. A fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 11, characterized in that: The fan status signal is firstly subjected to high-frequency filtering by an inductor, and then divided by a resistor and subjected to low-frequency filtering, and then sent to an optocoupler isolator to isolate the signal, and then an internal signal is generated and handed over to the processing unit for processing.

13. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 2, characterized in that: When the external power supply corresponding to a channel fails, only the two fans connected to it stop running, where the two fans are a fan of the channel and a fan of a different fan disk of an adjacent channel. The other fan of the adjacent channel and the fans of other channels are not affected.

14. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 6, characterized in that: When the isolation power supply unit or the power supply control unit partially fails or the fan monitoring unit fails, only the operation of one fan connected thereto will be affected.

15. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 6, characterized in that: The fan monitoring unit generates an alarm message when monitoring that the fan speed is lower than a threshold.

16. The fan heat dissipation device for N out of M architecture vehicle-mounted equipment according to claim 1, characterized in that: The N=3 and M=2, or N=5 and M=3.

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