Fan speed regulation circuit, energy storage cooling system and energy storage system

Abstract

The invention discloses a fan speed regulation circuit, an energy storage cooling system and an energy storage system. The fan speed regulation circuit comprises a processing module; the driving circuit module is coupled with the processing module and used for receiving the first control signal sent by the processing module, generating a second control signal according to the first control signal and outputting the second control signal to the target fan; the driving detection circuit module is coupled with the driving circuit module and the processing module and is used for acquiring the second control signal, generating a first sampling signal and outputting the first sampling signal to the processing module; the state feedback circuit module is coupled with the processing module and used for collecting a state signal of the target fan, generating a state feedback signal and outputting the state feedback signal to the processing module; wherein the processing module is used for adjusting the first control signal according to the second control signal, the sampling signal and / or the state feedback signal. By means of the mode, hardware self-detection of the fan speed regulation circuit and state detection of the fan can be achieved.

Description

Technical Field

[0001] This application relates to the technical field of fan control, and particularly to a fan speed regulation circuit, an energy storage cooling system, and an energy storage system. Background Art

[0002] During the operation of electronic devices, heat is often generated. Considering this situation, more and more electronic devices are equipped with corresponding cooling systems. For example, in the cooling system, a cooling fan is mainly used for heat dissipation. Taking a battery energy storage system as an example, heat is generated during the charging and discharging process of the battery. The cooling system can effectively control the temperature and prevent the battery from overheating. Overheating will accelerate battery aging, shorten its service life, and may even cause thermal runaway, resulting in serious consequences such as battery damage, combustion, or explosion. Secondly, a suitable temperature environment helps the battery maintain good performance, enabling the energy storage system to work stably and efficiently, ensuring the continuous supply of electricity and the safety and reliability of the energy storage system.

[0003] The disadvantage is that the failure of the cooling fan will have an adverse impact. For example, it will cause poor heat dissipation of the battery pack, resulting in too high battery temperature. This will not only accelerate battery aging and shorten the battery service life, but may also cause a decline in battery performance, such as capacity attenuation and lower charge and discharge efficiency. In severe cases, it may even cause thermal runaway, resulting in safety accidents such as battery swelling, combustion, and explosion. Based on this, the drive and detection of the cooling fan are very important. Summary of the Invention

[0004] This application provides a fan speed regulation circuit, an energy storage cooling system, and an energy storage system, which can realize the hardware self-check of the fan speed regulation circuit and the status detection of the fan.

[0005] In a first aspect, this application provides a fan speed regulation circuit, which includes: a processing module; a drive circuit module, coupled to the processing module, for receiving a first control signal sent by the processing module, generating a second control signal according to the first control signal, and outputting the second control signal to a target fan; a drive detection circuit module, coupled to the drive circuit module and the processing module, for collecting the second control signal, generating a first sampling signal, and outputting the first sampling signal to the processing module; a status feedback circuit module, coupled to the processing module, for collecting the status signal of the target fan, generating a status feedback signal and outputting it to the processing module; wherein, the processing module is used to adjust the first control signal according to the second control signal, the sampling signal, and / or the status feedback signal.

[0006] Among them, the drive circuit module includes: an upper bridge arm unit, the input end of the upper bridge arm unit is coupled to the processing module, and the first end of the upper bridge arm unit is used to receive the supply voltage; a lower bridge arm unit, the input end of the lower bridge arm unit is coupled to the processing module, and the output end of the lower bridge arm unit is coupled to the output end of the upper bridge arm unit; among them, when the first control signal is at a low level, the power device in the lower bridge arm unit is turned off, and a second control signal with a high level is output through the upper bridge arm unit; when the first control signal is at a high level, the power device in the upper bridge arm unit is turned off, and a second control signal with a low level is output through the lower bridge arm unit.

[0007] Among them, the upper bridge arm unit includes: a first voltage dividing unit, the first end of the first voltage dividing unit is coupled to the processing module, and the second end of the first voltage dividing unit is grounded; a first power device unit, the control end of the first power device unit is coupled to the voltage dividing node of the first voltage dividing unit, the first end of the first power device unit is used to receive the supply voltage, and the second end of the first power device unit is coupled to the second end of the first voltage dividing unit; a second power device unit, the control end of the second power device unit is coupled to the output end of the first power device unit, the first end of the second power device unit is used to receive the supply voltage, and the second end of the second power device unit is used as the output end of the upper bridge arm unit; the lower bridge arm unit includes: a second voltage dividing unit, the first end of the second voltage dividing unit is coupled to the processing module, and the second end of the second voltage dividing unit is grounded; a third power device unit, the first end of the third power device unit is coupled to the voltage dividing node of the second voltage dividing unit, and the second end of the third power device unit is coupled to the second end of the second voltage dividing unit; a fourth power device unit, the control end of the fourth power device unit is coupled to the voltage dividing node of the second voltage dividing unit, the first end of the fourth power device unit is coupled to the second end of the second power device unit, and the second end of the fourth power device unit is coupled to the control end of the third power device unit; among them, when the first control signal is at a low level, the power device in the fourth power device unit is turned off, and a second control signal with a high level is output through the second power device unit; when the first control signal is at a high level, the power device in the second power device unit is turned off, and a second control signal with a low level is output through the fourth power device unit.

[0008] Among them, the drive detection circuit module includes: a third voltage dividing unit, the first end of the third voltage dividing unit is coupled to the drive circuit module, and the second end of the third voltage dividing unit is grounded; a first amplifying unit, the first input end of the first amplifying unit is coupled to the voltage dividing node of the third voltage dividing unit, the second input end of the first amplifying unit is coupled to the output end of the first amplifying unit, and the output end of the first amplifying unit is coupled to the drive circuit module.

[0009] Among them, the state feedback circuit module includes: a fourth voltage dividing unit, the first end of the fourth voltage dividing unit is used to couple to the target fan and receive the power supply voltage, and the second end of the fourth voltage dividing unit is grounded; a fifth power device unit, the control end of the fifth power device unit is coupled to the voltage dividing node of the fourth voltage dividing unit, the first end of the fifth power device unit is coupled to the processing module, and the second end of the fifth power device unit is grounded; among them, when the target fan is normal, the fourth voltage dividing unit receives a state signal with a low level, and the fifth power device unit generates a state feedback signal with a high level and outputs it to the processing module; when the target fan is abnormal, the fourth voltage dividing unit receives the power supply voltage, and the fifth power device unit generates a state feedback signal with a low level and outputs it to the processing module.

[0010] Among them, the fan speed control circuit further includes: a power supply control module, coupled to the processing module, the external power supply terminal, the drive circuit module and the state feedback circuit module, and is used to receive the control signal of the processing module and convert the first voltage provided by the external power supply terminal into the power supply voltage.

[0011] Among them, the power supply control module includes: a control unit, the control end of the control unit is coupled to the processing module, and the first end of the control unit is grounded; a conversion unit, the input end of the conversion unit is coupled to the external power supply terminal, the control end of the conversion unit is coupled to the second end of the control unit, and the output end of the conversion unit is coupled to the drive circuit module and the state feedback circuit module, and is used to convert the first voltage provided by the external power supply terminal into the power supply voltage.

[0012] Among them, the fan speed control circuit further includes: a power supply detection module, coupled to the power supply control module and the processing module, and is used to receive the power supply voltage and generate a second sampling signal and output it to the processing module.

[0013] Among them, the power supply detection module further includes: a fifth voltage dividing unit, the first end of the fifth voltage dividing unit is coupled to the power supply control module, and the second end of the fifth voltage dividing unit is grounded; a second amplifying unit, the first input end of the second amplifying unit is coupled to the voltage dividing node of the fifth voltage dividing unit, the second input end of the second amplifying unit is coupled to the output end of the second amplifying unit, and the output end of the second amplifying unit is coupled to the processing module.

[0014] In a second aspect, the present application provides an energy storage cooling system, and the energy storage cooling system includes the fan speed control circuit provided in the first aspect.

[0015] In a third aspect, the present application provides an energy storage system, including the fan speed control circuit provided in the first aspect, or the energy storage cooling system provided in the second aspect.

[0016] The beneficial effects of the present application are as follows: Different from the prior art, the fan speed control circuit, energy storage cooling system, and energy storage system provided by the present application are provided with a drive circuit module in the fan speed control circuit, which receives the first control signal sent by the processing module, generates a second control signal according to the first control signal, and outputs the second control signal to the target fan to drive the target fan to work. In addition, a drive detection circuit module is provided in the fan speed control circuit to collect the second control signal output by the drive circuit module, generate a first sampling signal, and output the first sampling signal to the processing module, so that the processing module can complete the detection of the drive circuit module. Moreover, a status feedback circuit module is provided in the fan speed control circuit to collect the status signal of the target fan, generate a status feedback signal, and output it to the processing module, so that the processing module can complete the status detection of the fan. Thus, the hardware self-check of the fan speed control circuit and the status detection of the fan are realized, effectively avoiding the spread of faults caused by the faults of the fan speed control circuit or the fan. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. Among them:

[0018] Figure 1 It is a schematic structural diagram of an embodiment of the fan speed control circuit provided by the present application;

[0019] Figure 2 It is a schematic structural diagram of an embodiment of the drive circuit module provided by the present application;

[0020] Figure 3 It is a schematic structural diagram of an embodiment of the drive detection circuit module provided by the present application;

[0021] Figure 4 It is a schematic structural diagram of an embodiment of the status feedback circuit module provided by the present application;

[0022] Figure 5 It is a schematic structural diagram of another embodiment of the fan speed control circuit provided by the present application;

[0023] Figure 6 It is a schematic structural diagram of an embodiment of the power control module provided by the present application;

[0024] Figure 7 It is a schematic structural diagram of another embodiment of the fan speed control circuit provided by the present application;

[0025] Figure 8 It is a schematic structural diagram of an embodiment of the power detection module provided by the present application;

[0026] Figure 9 is a schematic flowchart of an embodiment of the fan speed regulation method provided by the present application;

[0027] Figure 10 is a schematic structural diagram of an embodiment of the energy storage cooling system provided by the present application;

[0028] Figure 11 is a schematic structural diagram of an embodiment of the energy storage system provided by the present application;

[0029] Figure 12 is a schematic structural diagram of another embodiment of the energy storage system provided by the present application. Detailed implementation manners

[0030] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. Additionally, it should be noted that for the convenience of description, only parts related to the present application rather than all structures are shown in the accompanying drawings. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0031] Referring to "embodiments" in this article means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The phrase appears in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

[0032] During the operation of electronic devices, heat is often generated. Considering this situation, more and more electronic devices are equipped with corresponding cooling systems. For example, the cooling system mainly uses a cooling fan for heat dissipation. Taking the battery energy storage system as an example, heat is generated during the charging and discharging process of the battery, and the cooling system can effectively control the temperature to prevent the battery from overheating. Overheating will accelerate the aging of the battery, shorten its service life, and may even cause thermal runaway, resulting in serious consequences such as battery damage, combustion, or explosion. Secondly, a suitable temperature environment helps the battery maintain good performance, enabling the energy storage system to operate stably and efficiently, ensuring the continuous supply of electricity and the safety and reliability of the energy storage system.

[0033] The disadvantage is that the failure of the cooling fan will have an adverse impact. For example, it will cause poor heat dissipation of the battery pack, resulting in too high battery temperature. This will not only accelerate battery aging and shorten the battery life, but may also cause a decline in battery performance, such as capacity attenuation and lower charge and discharge efficiency. In severe cases, it may even trigger thermal runaway, causing safety accidents such as battery swelling, combustion, and explosion. Based on this, the driving and detection of the cooling fan are very important.

[0034] Based on this, the present application proposes to set a drive circuit module in the fan speed control circuit, which receives the first control signal sent by the processing module, generates a second control signal according to the first control signal, and outputs the second control signal to the target fan, so as to drive the target fan to work. And a drive detection circuit module is set in the fan speed control circuit to collect the second control signal output by the drive circuit module, generate a first sampling signal, and output the first sampling signal to the processing module, so that the processing module can complete the detection of the drive circuit module. And a status feedback circuit module is set in the fan speed control circuit to collect the status signal of the target fan, generate a status feedback signal and output it to the processing module, so that the processing module can complete the status detection of the fan, thereby realizing the hardware self-check of the fan speed control circuit and the status detection of the fan, effectively avoiding the spread of faults caused by the failure of the fan speed control circuit or the fan. For specific reference, see the following embodiments.

[0035] See Figure 1 , Figure 1 is a schematic structural diagram of an embodiment of the fan speed control circuit provided by the present application. The fan speed control circuit 100 includes: a processing module 10, a drive circuit module 20, a drive detection circuit module 30, and a status feedback circuit module 40.

[0036] The drive circuit module 20 is coupled to the processing module 10, and is used to receive the first control signal sent by the processing module 10, generate a second control signal according to the first control signal, and output the second control signal to the target fan 200.

[0037] The drive detection circuit module 30 is coupled to the drive circuit module 20 and the processing module 10, and is used to collect the second control signal, generate a first sampling signal, and output the first sampling signal to the processing module 10.

[0038] The status feedback circuit module 40 is coupled to the processing module 10, and is used to collect the status signal of the target fan 200, generate a status feedback signal and output it to the processing module 10; wherein, the processing module 10 is used to adjust the first control signal according to the second control signal, the sampling signal, and / or the status feedback signal.

[0039] In an application scenario, the target fan 200 is used to dissipate heat from the energy storage system. The processing module 10 detects the temperature of the energy storage system and sends a first control signal to the drive circuit module 20 according to the temperature. The drive circuit module 20 generates a second control signal according to the first control signal and outputs the second control signal to the target fan 200. The target fan 200 operates according to the second control signal to dissipate heat from the energy storage system. The drive detection circuit collects the second control signal during this process, generates a first sampling signal, and outputs the first sampling signal to the processing module 10. The first sampling signal can characterize whether the output of the drive circuit module 20 is normal. That is, the processing module 10 can detect whether the drive circuit module 20 is normal according to the first sampling signal. When the drive circuit module 20 is abnormal, it is determined that a fault has occurred, and then the first control signal sent to the drive circuit module 20 is stopped, and the fault can be reported.

[0040] Similarly, the status feedback circuit module 40 collects the status signal of the target fan 200 during this process, generates a status feedback signal, and outputs the status feedback signal to the processing module 10. The status feedback signal can characterize whether the target fan 200 is normal. That is, the processing module 10 can detect whether the target fan 200 is normal according to the status feedback signal. When the target fan 200 is abnormal, it is determined that a fault has occurred, and then the first control signal sent to the drive circuit module 20 is stopped, and the fault can be reported.

[0041] In this embodiment, a drive circuit module 20 is provided in the fan speed control circuit 100 to receive the first control signal sent by the processing module 10, generate a second control signal according to the first control signal, and output the second control signal to the target fan 200 to drive the target fan 200 to operate. And a drive detection circuit module 30 is provided in the fan speed control circuit 100 to collect the second control signal output by the drive circuit module 20, generate a first sampling signal, and output the first sampling signal to the processing module 10, so that the processing module 10 can complete the detection of the drive circuit module 20. And a status feedback circuit module 40 is provided in the fan speed control circuit 100 to collect the status signal of the target fan 200, generate a status feedback signal, and output the status feedback signal to the processing module 10, so that the processing module 10 can complete the status detection of the fan, thereby realizing the hardware self-check of the fan speed control circuit 100 and the status detection of the fan, effectively avoiding the fault spread caused by the fault of the fan speed control circuit 100 or the fan.

[0042] Further, referring to Figure 2 , the drive circuit module 20 includes: an upper bridge arm unit 21 and a lower bridge arm unit 22.

[0043] The input end of the upper bridge arm unit 21 is coupled to the processing module 10, and the first end of the upper bridge arm unit 21 is used to receive the supply voltage IO.VDD.

[0044] The input end of the lower bridge arm unit 22 is coupled to the processing module 10, and the output end of the lower bridge arm unit 22 is coupled to the output end of the upper bridge arm unit 21.

[0045] Wherein, when the first control signal PWM.WR is at a low level, the power device in the lower bridge arm unit 22 is turned off, and the second control signal PWM.OUT with a high level is output through the upper bridge arm unit 21; when the first control signal PWM.WR is at a high level, the power device in the upper bridge arm unit 21 is turned off, and the second control signal PWM.OUT with a low level is output through the lower bridge arm unit 22.

[0046] Exemplarily, the upper bridge arm unit 21 includes: a first voltage dividing unit 211, a first power device unit 212, and a second power device unit 213.

[0047] The first end of the first voltage dividing unit 211 is coupled to the processing module 10, and the second end of the first voltage dividing unit 211 is grounded.

[0048] The control end of the first power device unit 212 is coupled to the voltage dividing node of the first voltage dividing unit 211. The first end of the first power device unit 212 is used to receive the supply voltage IO.VDD, and the second end of the first power device unit 212 is coupled to the second end of the first voltage dividing unit 211.

[0049] The control end of the second power device unit 213 is coupled to the output end of the first power device unit 212. The first end of the second power device unit 213 is used to receive the supply voltage IO.VDD, and the second end of the second power device unit 213 serves as the output end of the upper bridge arm unit 21.

[0050] The lower bridge arm unit 22 includes: a second voltage dividing unit 221, a third power device unit 222, and a fourth power device unit 223.

[0051] The first end of the second voltage dividing unit 221 is coupled to the processing module 10, and the second end of the second voltage dividing unit 221 is grounded.

[0052] The first end of the third power device unit 222 is coupled to the voltage dividing node of the second voltage dividing unit 221, and the second end of the third power device unit 222 is coupled to the second end of the second voltage dividing unit 221.

[0053] The control end of the fourth power device unit 223 is coupled to the voltage dividing node of the second voltage dividing unit 221. The first end of the fourth power device unit 223 is coupled to the second end of the second power device unit 213, and the second end of the fourth power device unit 223 is coupled to the control end of the third power device unit 222.

[0054] Among them, when the first control signal PWM.WR is at a low level, the power device in the fourth power device unit 223 is turned off, and the second control signal PWM.OUT with a high level is output through the second power device unit 213.

[0055] When the first control signal PWM.WR is at a high level, the power device in the second power device unit 213 is turned off, and the second control signal PWM.OUT with a low level is output through the fourth power device unit 223.

[0056] Specifically, the first voltage dividing unit 211 includes a resistor R17 and a resistor R19. The first power device unit 212 includes a triode Q5, a resistor R22, and a capacitor C11. The second power device unit 213 includes a triode Q8 and a diode D5. The second voltage dividing unit 221 includes a resistor R15, a diode D3, a diode D2, a capacitor C10, and a resistor R20. The third power device unit 222 includes a resistor R23, a triode Q6, a resistor R25, and a capacitor C14. The fourth power device unit 223 includes a triode Q9 and a resistor R27. Further, the drive circuit module 20 further includes a resistor R28, a diode D6, and a capacitor C17.

[0057] The processing module 10 generates a first control signal PWM.WR and inputs it to the drive circuit module 20. When the first control signal PWM.WR is at a low level, the voltage division of the resistor R15 and the resistor R20 is 0, and the triode Q9 is turned off; the resistor R17 and the resistor R19 are 0, the triode Q5 is turned off, the base of the triode Q8 is pulled up to the supply voltage IO.VDD through the resistor R22, the triode Q8 is turned on, and the second control signal PWM.OUT is at a high level. When the first control signal PWM.WR is at a high level, the voltage division of the resistor R17 and the resistor R19 drives the triode Q5 to turn off. The triode Q5 and the resistor R22 form a voltage division. Since the saturation voltage drop of the triode is less than 0.2V, the triode Q8 is turned off; the voltage division of the resistor R15 and the R20 drives the triode Q9 to turn on, and the second control signal PWM.OUT is pulled low, so the second control signal PWM.OUT is at a low level. Since the driving ability of the triode is greater than that of the processing module 10, the PWM amplified output function is realized.

[0058] When the first control signal PWM.WR transitions from low level to high level, the first control signal PWM.WR passes through resistor R15 and diode D3, and then reaches resistor R20 and capacitor C10. A voltage drop will occur across diode D3 in this circuit. The voltage of capacitor C10 will not change suddenly. After capacitor C10 is charged, its voltage rises. When the voltage of capacitor C10 rises to the conduction voltage of triode Q9, triode Q9 conducts. The first control signal PWM.WR drives triode Q5 through voltage division by resistor R17 and resistor R19. There is no capacitor and no voltage drop caused by a diode in this circuit, so the driving voltage of triode Q9 rises later than that of triode Q5. After triode Q5 conducts, triode Q8 cuts off. Thus, the dead time between the time when Q8 cuts off in advance and the conduction time of Q9 is realized, avoiding the simultaneous conduction of triode Q8 and triode Q9, which may cause damage to the triode.

[0059] When the first control signal PWM.WR transitions from high level to low level, the low-level signal of the first control signal PWM.WR quickly discharges the charge of capacitor C10 through Schottky diode D2, and triode Q9 cuts off; the low-level signal of the first control signal PWM.WR pulls down the voltage of the base of triode Q5 through resistor R17, and triode Q5 cuts off. Resistor R22 charges capacitor C11. When the voltage of capacitor C11 is higher than the conduction voltage of Q8, Q8 conducts. Thus, the dead time between the time when Q9 cuts off in advance and the conduction time of Q8 is realized, and the simultaneous conduction of triode Q8 and Q9 may cause damage to the triode.

[0060] When the equivalent resistance of the external load RL_load is too small, it will cause the output current of the second control signal PWM.OUT to be too large. After exceeding the set value, combined with Figure 6 the current limiting loop of the power supply control module 50 will work, and the output voltage of IO.VDD will decrease, that is, the amplitude of the second control signal PWM.OUT will decrease until the output current of PWM.OUT is not greater than the set value. Thus, overcurrent limitation of the PWM.OUT output current is realized, protecting the device from overheating and burning out.

[0061] When the equivalent resistance of the external load RH_load is too small, it will cause the input current of the second control signal PWM.OUT to be too large. After exceeding the set value, the voltage generated by the current across resistor R27 drives triode Q6 to conduct through resistor R25. Triode Q6 pulls down the base voltage of triode Q9 through resistor R23 to adjust the working state of triode Q9, and the equivalent resistance of triode Q9 becomes larger. The equivalent resistance of triode Q9, resistor R28, and the external load RH_Load form a voltage division to reduce the input current of the second control signal PWM.OUT until the input current of the second control signal PWM.OUT is not greater than the set value. Thus, overcurrent limitation of the input current of the second control signal PWM.OUT is realized, protecting the device from overheating and burning out.

[0062] When the external access voltage VCC is higher than the voltage of the second control signal PWM.OUT, the diode D5 can effectively prevent the internal circuit from being damaged due to current conduction.

[0063] Further, referring to Figure 3 , the drive detection circuit module 30 includes: a third voltage dividing unit 31 and a first amplifying unit 32.

[0064] The first end of the third voltage dividing unit 31 is coupled to the drive circuit module 20, and the second end of the third voltage dividing unit 31 is grounded. The first input terminal of the first amplifying unit 32 is coupled to the voltage dividing node of the third voltage dividing unit 31, the second input terminal of the first amplifying unit 32 is coupled to the output terminal of the first amplifying unit 32, and the output terminal of the first amplifying unit 32 is coupled to the drive circuit module 20.

[0065] Specifically, the third voltage dividing unit 31 includes a resistor R16, a resistor R18, a diode D4, and a capacitor C13. The first amplifying unit 32 includes an operational amplifier U3, a resistor R29, and a capacitor C16.

[0066] Wherein, when the second control signal PWM.OUT is input to the resistor R16, the resistor R16 and the resistor R18 divide the voltage to charge the capacitor C13. The operational amplifier U3 converts the voltage of the capacitor C13 into a low-impedance voltage source signal and generates a first sampling signal PWM.CHK to be input to the processing module 10. The processing module 10 samples and calculates. If the sampled voltage exceeds the upper or lower limit of the set value, it is determined that the output of the second control signal PWM.OUT is abnormal, and the output of the first control signal PWM.WR is stopped. Thus, the output detection, abnormal diagnosis, and protection functions of the second control signal PWM.OUT are realized.

[0067] Further, referring to Figure 4 , the state feedback circuit module 40 includes: a fourth voltage dividing unit 41 and a fifth power device unit 42.

[0068] The first end of the fourth voltage dividing unit 41 is used to be coupled to the target fan 200 and receive the supply voltage IO.VDD, and the second end of the fourth voltage dividing unit 41 is grounded. The control terminal of the fifth power device unit 42 is coupled to the voltage dividing node of the fourth voltage dividing unit 41, the first end of the fifth power device unit 42 is coupled to the processing module 10, and the second end of the fifth power device unit 42 is grounded.

[0069] Among them, when the target fan 200 is normal, the fourth voltage dividing unit 41 receives the status signal DIL with a low level, and the fifth power device unit 42 generates a status feedback signal DI.RD with a high level and outputs it to the processing module 10; when the target fan 200 is abnormal, the fourth voltage dividing unit 41 receives the power supply voltage IO.VDD, and the fifth power device unit 42 generates a status feedback signal DI.RD with a low level and outputs it to the processing module 10.

[0070] Specifically, the fourth voltage dividing unit 41 includes a resistor R31, a diode D7, a capacitor C18, a diode D8, a resistor R30, a resistor R32, a capacitor C15, and a resistor R26. The fifth power device unit 42 includes a triode Q7, a resistor R24, a resistor R21, and a capacitor C12.

[0071] Among them, the status signal DIL of the fan is input to the resistor R30. The resistors R32 and R26 form a voltage division to drive the triode Q7, and the signal is input to the processing module 10 through the resistor R21. The processing module 10 executes a control strategy according to the fan status.

[0072] When the fan fails, the output is open. The power supply voltage IO.VDD is divided by the resistor R31, the diode D7, and the resistor R32, and drives the triode Q7 through the resistor R30. The triode Q7 conducts, and forms a voltage division with the resistor R24. Since the saturation conduction voltage drop of the triode Q7 is small, the processing module 10 detects the status feedback signal DI.RD with a low level.

[0073] When the fan is normal, a low level is output, and the electric energy of the capacitor C15 is consumed through the resistor R30. The voltage of the capacitor C15 drops to the cut-off voltage of the triode Q7, and the triode Q7 cuts off. After the triode Q7 cuts off, the voltage signal detected by the processing module 10 is pulled up by the resistor R24, and the processing module 10 detects the status feedback signal DI.RD with a high level.

[0074] Further, referring to Figure 5 , the fan speed control circuit 100 further includes: a power supply control module 50. The power supply control module 50 is coupled to the processing module 10, an external power supply terminal, a driving circuit module 20, and a status feedback circuit module 40, and is used to receive the control signal of the processing module 10 and convert the first voltage provided by the external power supply terminal into the above-mentioned power supply voltage IO.VDD.

[0075] Further, referring to Figure 6 , the power supply control module 50 includes: a control unit 51 and a conversion unit 52.

[0076] The control terminal of the control unit 51 is coupled to the processing module 10, and the first terminal of the control unit 51 is grounded. The input terminal of the conversion unit 52 is coupled to an external power supply terminal (e.g., the external power supply terminal provides a 24V voltage). The control terminal of the conversion unit 52 is coupled to the second terminal of the control unit 51, and the output terminal of the conversion unit 52 is coupled to the drive circuit module 20 and the status feedback circuit module 40, and is used to convert the first voltage provided by the external power supply terminal into a supply voltage IO.VDD.

[0077] Specifically, the control unit 51 includes a resistor R3, a resistor R7, and a triode Q2. The conversion unit 52 includes a resistor R1, a resistor R4, a triode Q1, a resistor R2, a resistor R6, a resistor R9, a capacitor C5, a triode Q3, a capacitor C3, a triode Q4, a diode U2, a capacitor C6, a diode D1, a resistor R11, a resistor R12, a capacitor C8, and a capacitor C9.

[0078] Among them, the external DC 24V input passes through the resistor R1, the resistor R2, the triode Q4, and the diode D1, and is converted to obtain the supply voltage IO.VDD (such as a 5.5V constant voltage power supply). The resistor R11 and the resistor R12 divide the voltage of the supply voltage IO.VDD and then feedback it to the diode U2. The diode U2 adjusts the equivalent internal resistance from the C pin to the A pin of the diode U2 according to the feedback voltage inside, and forms a voltage division with the resistor R2. This divided voltage is input to the triode Q4 to adjust the voltage drop of the triode, and realizes the stable voltage output of the closed-loop control supply voltage IO.VDD. When the current I flows through the resistor R1, the resistor R1 generates a voltage drop V1 = I / R1. When the current I increases, the voltage drop V1 of the resistor R1 will increase. After the voltage drop V1 voltage increases and exceeds the conduction voltage of the triode Q1, the triode Q1 will conduct with current limiting. The triode Q1 forms a voltage division with the resistor R6 and the resistor R9. This divided voltage drives the triode Q3 to conduct with current limiting. The triode Q3 forms a voltage division with the resistor R2. This divided voltage is input to the triode Q4 to adjust the voltage drop of the triode. However, the larger the current I is, the larger the voltage drop V1 generated by R1 is, the smaller the conduction internal resistance of the triode Q1 is, the larger the voltage division of R9 is, the smaller the conduction internal resistance of the triode Q3 is, the smaller the voltage division of the triode Q3 and the resistor R2 is, the smaller the output voltage of the triode Q4 is. When the load remains unchanged, the voltage of the supply voltage IO.VDD becomes smaller, and the current I will also become smaller, thus realizing current limiting output. The high-voltage control signal IO.VDD.CTRL output by the processing module 10 is divided by the resistor R3 and the resistor R7, and drives the triode Q2 to conduct. The conduction internal resistance of the triode Q2 is much smaller than that of the resistor R2, and the saturation conduction voltage drop of the triode Q2 is less than 0.2V. Therefore, the triode Q4 will cut off, thereby realizing the stop output of the supply voltage IO.VDD. Among them, the capacitors C3, C5, and C6 can improve the stability of the control loop.

[0079] Refer to Figure 7, the fan speed control circuit 100 further includes: a power supply detection module 60. The power supply detection module 60 is coupled to the power supply control module 50 and the processing module 10, and is configured to receive a supply voltage and generate a second sampling signal for output to the processing module.

[0080] See Figure 8 , the power supply detection module 60 further includes: a fifth voltage dividing unit 61 and a second amplifying unit 62.

[0081] The first end of the fifth voltage dividing unit 61 is coupled to the power supply control module 50, and the second end of the fifth voltage dividing unit 61 is grounded. The first input terminal of the second amplifying unit 62 is coupled to the voltage dividing node of the fifth voltage dividing unit 61, the second input terminal of the second amplifying unit 62 is coupled to the output terminal of the second amplifying unit 62, and the output terminal of the second amplifying unit 62 is coupled to the processing module 10.

[0082] Specifically, the fifth voltage dividing unit 61 includes a resistor R13, a resistor R10, and a capacitor C7. The second amplifying unit 62 includes an operational amplifier U1B, a resistor R8, a resistor R14, a capacitor C4, a resistor R5, and a capacitor C2.

[0083] Among them, the resistor R13 is connected to the output terminal of the power supply control module 50 to receive the supply voltage IO.VDD, the resistor R14 is connected to the reference ground GND, and after being amplified by the operational amplifier U1B, it is output to the resistor R5. The resistor R5 and the capacitor C2 form a first-order filter network, and the filtered stable voltage second sampling signal IO.VDD.CHK is input to the ADC sampling of the processing module 10. The processing module 10 calculates the voltage of the supply voltage IO.VDD according to the sampling value. If this voltage exceeds the upper or lower limit of the set value, it will be regarded as a circuit fault, and the output of the first control signal PWM.WR, the power supply output, and the fault reporting will be stopped. Thus, the circuit diagnosis and protection functions are realized.

[0084] See Figure 9 , Figure 9 is a schematic flow chart of an embodiment of the fan speed control method provided by the present application. The method includes:

[0085] Step 91: The processing module outputs a first control signal according to the temperature of the energy storage system.

[0086] Step 92: The processing module monitors the first sampling signal output by the drive detection circuit module and the second sampling signal output by the power supply detection module.

[0087] Step 93: When the processing module detects that the first sampling signal and / or the second sampling signal is abnormal, it stops the output of the first control signal and reports a fault.

[0088] In an application scenario, after the system is initialized, the processing module sets the duty cycle of the first control signal according to the temperature of the battery pack, and monitors the voltages of the first sampling signal IO.VDD.CHK and the second sampling signal PWM.CHK in real time. If both voltages are normal, it continues to monitor the temperature of the battery pack and then sets the duty cycle of the first control signal. If one of the voltages is abnormal, it stops the output of the first control signal, reports a fault, and after a 10-second delay, it resumes monitoring the temperature of the battery pack and then sets the duty cycle of the first control signal output. Thus, the functions of hardware self-check, automatic protection, and automatic recovery after fault elimination are realized.

[0089] Refer to Figure 10 , Figure 10 which is a schematic structural diagram of an embodiment of the energy storage cooling system provided by this application. The energy storage cooling system 300 includes the fan speed control circuit 100 of any of the above embodiments.

[0090] Refer to Figure 11 , Figure 11 which is a schematic structural diagram of an embodiment of the energy storage system provided by this application. The energy storage system 400 includes the fan speed control circuit 100 of any of the above embodiments.

[0091] Refer to Figure 12 , Figure 12 which is a schematic structural diagram of another embodiment of the energy storage system provided by this application. The energy storage system 400 includes the energy storage cooling system 300 of any of the above embodiments.

[0092] In summary, for the fan speed control circuit 100, the energy storage cooling system 300, and the energy storage system 400 provided by this application, a drive circuit module 20 is set in the fan speed control circuit 100 to receive the first control signal sent by the processing module 10, generate a second control signal according to the first control signal, and output the second control signal to the target fan 200 to drive the target fan 200 to work. A drive detection circuit module 30 is set in the fan speed control circuit 100 to collect the second control signal output by the drive circuit module 20, generate a first sampling signal, and output the first sampling signal to the processing module 10 so that the processing module 10 can complete the detection of the drive circuit module 20. A status feedback circuit module 40 is set in the fan speed control circuit 100 to collect the status signal of the target fan 200, generate a status feedback signal, and output it to the processing module 10 so that the processing module 10 can complete the status detection of the fan. Thus, the hardware self-check of the fan speed control circuit 100 and the status detection of the fan are realized, effectively avoiding the spread of faults caused by the failure of the fan speed control circuit 100 or the fan.

[0093] In several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0094] If the integrated unit in the above-mentioned other embodiments is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs that can store program codes.

[0095] The above is only the embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A fan speed control circuit, characterized in that: The fan speed control circuit comprises: Processing module; a driving circuit module, coupled to the processing module, configured to receive a first control signal sent by the processing module, generate a second control signal according to the first control signal, and output the second control signal to a target fan; a driving detection circuit module, coupled to the driving circuit module and the processing module, configured to collect the second control signal, generate a first sampling signal, and output the first sampling signal to the processing module; A state feedback circuit module, coupled to the processing module, for collecting a state signal of the target fan, generating a state feedback signal and outputting it to the processing module; The processing module is used to adjust the first control signal according to the second control signal, the sampling signal and / or the state feedback signal.

2. The fan speed control circuit according to claim 1, characterized in that: The driving circuit module comprises: An upper bridge arm unit, wherein an input end of the upper bridge arm unit is coupled to the processing module, and a first end of the upper bridge arm unit is used to receive a power supply voltage; A lower bridge arm unit, wherein an input end of the lower bridge arm unit is coupled to the processing module, and an output end of the lower bridge arm unit is coupled to an output end of the upper bridge arm unit; Wherein, when the first control signal is at a low level, the power device in the lower bridge arm unit is turned off, and the second control signal with a high level is output through the upper bridge arm unit; When the first control signal is at a high level, the power device in the upper bridge arm unit is turned off, and the second control signal with a low level is output through the lower bridge arm unit.

3. The fan speed control circuit according to claim 2, characterized in that: The upper bridge arm unit comprises: A first voltage dividing unit, wherein a first end of the first voltage dividing unit is coupled to the processing module, and a second end of the first voltage dividing unit is grounded; a first power device unit, wherein a control end of the first power device unit is coupled to a voltage dividing node of the first voltage dividing unit, a first end of the first power device unit is used to receive the supply voltage, and a second end of the first power device unit is coupled to a second end of the first voltage dividing unit; a second power device unit, wherein a control end of the second power device unit is coupled to an output end of the first power device unit, a first end of the second power device unit is used to receive the power supply voltage, and a second end of the second power device unit is used as an output end of the upper bridge arm unit; The lower bridge arm unit comprises: A second voltage dividing unit, wherein a first end of the second voltage dividing unit is coupled to the processing module, and a second end of the second voltage dividing unit is grounded; A third power device unit, wherein a first end of the third power device unit is coupled to the voltage dividing node of the second voltage dividing unit, and a second end of the third power device unit is coupled to the second end of the second voltage dividing unit; a fourth power device unit, wherein a control end of the fourth power device unit is coupled to the voltage dividing node of the second voltage dividing unit, a first end of the fourth power device unit is coupled to the second end of the second power device unit, and a second end of the fourth power device unit is coupled to the control end of the third power device unit; Wherein, when the first control signal is at a low level, the power device in the fourth power device unit is turned off, and the second control signal with a high level is output through the second power device unit; When the first control signal is at a high level, the power device in the second power device unit is turned off, and the second control signal with a low level is output through the fourth power device unit.

4. The fan speed regulating circuit according to claim 1, characterized in that: The drive detection circuit module comprises: A third voltage dividing unit, wherein a first end of the third voltage dividing unit is coupled to the driving circuit module, and a second end of the third voltage dividing unit is grounded; A first amplifying unit, wherein a first input terminal of the first amplifying unit is coupled to a voltage dividing node of the third voltage dividing unit, a second input terminal of the first amplifying unit is coupled to an output terminal of the first amplifying unit, and an output terminal of the first amplifying unit is coupled to the driving circuit module.

5. The fan speed regulating circuit according to claim 1, characterized in that: The state feedback circuit module comprises: a fourth voltage dividing unit, wherein a first end of the fourth voltage dividing unit is used to couple the target fan and receive the power supply voltage, and a second end of the fourth voltage dividing unit is grounded; a fifth power device unit, wherein a control end of the fifth power device unit is coupled to the voltage dividing node of the fourth voltage dividing unit, a first end of the fifth power device unit is coupled to the processing module, and a second end of the fifth power device unit is grounded; Wherein, when the target fan is normal, the fourth voltage dividing unit receives the state signal with a low level, and the fifth power device unit generates the state feedback signal with a high level and outputs it to the processing module; When the target fan is abnormal, the fourth voltage dividing unit receives the supply voltage, and the fifth power device unit generates the state feedback signal with a low level and outputs it to the processing module.

6. The fan speed regulating circuit according to claim 1, characterized in that: The fan speed control circuit also includes: The power control module is coupled to the processing module, the external power supply terminal, the driving circuit module and the state feedback circuit module, and is used to receive the control signal of the processing module and convert the first voltage provided by the external power supply terminal into a power supply voltage.

7. The fan speed regulating circuit according to claim 6, characterized in that: The power control module comprises: A control unit, wherein a control end of the control unit is coupled to the processing module, and a first end of the control unit is grounded; A conversion unit, wherein the input end of the conversion unit is coupled to the external power supply end, the control end of the conversion unit is coupled to the second end of the control unit, and the output end of the conversion unit is coupled to the driving circuit module and the state feedback circuit module, and is used to convert the first voltage provided by the external power supply end into the supply voltage.

8. The fan speed regulating circuit according to claim 6, characterized in that: The fan speed control circuit also includes: The power detection module is coupled to the power control module and the processing module, and is used to receive the power supply voltage and generate a second sampling signal to output to the processing module.

9. The fan speed regulating circuit according to claim 8, characterized in that: The power detection module also includes: a fifth voltage dividing unit, wherein a first end of the fifth voltage dividing unit is coupled to the power control module, and a second end of the fifth voltage dividing unit is grounded; A second amplifying unit, wherein a first input terminal of the second amplifying unit is coupled to the voltage dividing node of the fifth voltage dividing unit, a second input terminal of the second amplifying unit is coupled to the output terminal of the second amplifying unit, and an output terminal of the second amplifying unit is coupled to the processing module.

10. An energy storage cooling system, characterized in that: The energy storage cooling system includes a fan speed control circuit as described in any one of claims 1-9.

11. An energy storage system, characterized in that: It comprises the fan speed regulation circuit as described in any one of claims 1 to 9, or the energy storage cooling system as described in claim 10.

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