Fan driving circuit and range hood

Abstract

The utility model relates to a fan driving circuit and a range hood. The fan driving circuit comprises a first driving circuit which is used for receiving a PWM wave signal sent by the controller, is in a conducting state and supplies power to a first relay; the second driving circuit is used for receiving the PWM wave signal sent by the controller, is in a conducting state and supplies power to the second relay; the first interlocking function circuit is used for controlling the first driving circuit to be disconnected when the second driving circuit is switched on; the second interlocking function circuit is used for controlling the second driving circuit to be disconnected when the first driving circuit is switched on; the first relay is used for being switched on when the first driving circuit is switched on and driving the fan to operate according to a first operation gear; and the second relay is used for being switched on when the second driving circuit is switched on and driving the fan to operate according to the second operation gear. According to the invention, interlocking among the gears of the motor of the fan can be realized, and danger caused by accidental conduction is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to range hood technology field especially is a fan drive circuit and range hood. BACKGROUND

[0002] At present, the safety of the motor drive of the modern household range hood affects the safe use of the range hood and the personal safety of the user. In the prior art, the motor drive circuit of the range hood is a single relay control circuit, and the single relay control circuit realizes the switching of the load. However, the single relay control circuit cannot guarantee that the motor taps of each gear are mutually locked and independently work. SUMMARY

[0003] Therefore, it is necessary to provide a fan drive circuit and a range hood aiming at the above technical problems.

[0004] In a first aspect, a fan drive circuit is provided, which comprises a first drive circuit, a second drive circuit, a first interlocking function circuit, a second interlocking function circuit, a first relay circuit and a second relay circuit; wherein,

[0005] The first drive circuit is connected with the first interlocking function circuit, the first relay circuit, the second interlocking function circuit and a controller respectively, the first relay circuit is connected with a control interface of a first running gear of a fan, and the first interlocking function circuit is connected with the second drive circuit;

[0006] The second drive circuit is connected with the second interlocking function circuit, the second relay circuit, the first interlocking function circuit and the controller respectively, the second relay circuit is connected with a control interface of a second running gear of the fan, and the second interlocking function circuit is connected with the first drive circuit;

[0007] The first drive circuit is used for receiving a PWM wave signal sent by the controller, and is in a conduction state to supply power to the first relay circuit;

[0008] The second drive circuit is used for receiving a PWM wave signal sent by the controller, and is in a conduction state to supply power to the second relay circuit;

[0009] The first interlocking function circuit is used for controlling the first drive circuit to be disconnected when the second drive circuit is in a conduction state;

[0010] The second interlocking function circuit is used for controlling the second drive circuit to be disconnected when the first drive circuit is in a conduction state;

[0011] The first relay circuit is used to turn on when the first driving circuit is turned on, and drive the fan to run according to the first running gear.

[0012] The second relay circuit is used to turn on when the second driving circuit is turned on, and drive the fan to run according to the second running gear.

[0013] As an optional implementation, the first driving circuit comprises a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a first electrolytic capacitor, a first diode, a second diode and a first capacitor.

[0014] The collector of the first triode is connected to the first relay circuit, the base of the first triode is connected to one end of the first resistor, the other end of the first resistor is connected to the first interlocking function circuit, one end of the second resistor and one end of the third resistor respectively, the emitter of the first triode is connected to the collector of the second triode, the base of the second triode is connected to the other end of the second resistor, one end of the second resistor is connected to the first interlocking function circuit and one end of the third resistor respectively, the emitter of the second triode is connected to one end of the fourth resistor, the negative electrode of the first electrolytic capacitor and the positive electrode of the second diode and grounded, one end of the third resistor is connected to the first interlocking function circuit, the other end of the third resistor is connected to the other end of the fourth resistor, the positive electrode of the first electrolytic capacitor, the second interlocking function circuit and the negative electrode of the first diode respectively, the positive electrode of the first diode is connected to the negative electrode of the first capacitor and the negative electrode of the first diode respectively, the positive electrode of the first capacitor is connected to the controller, and the first triode and the second triode constitute a double failure protection triode TTL circuit.

[0015] As an optional implementation, the first interlocking function circuit comprises a third triode, a fifth resistor and a sixth resistor.

[0016] The collector of the third triode is connected to the first driving circuit, the emitter of the third triode is connected to one end of the fifth resistor and grounded, and the base of the third triode is connected to the other end of the fifth resistor and one end of the sixth resistor respectively, and the other end of the sixth resistor is connected to the second driving circuit.

[0017] As an optional implementation, the first relay circuit comprises a first power supply, a first relay and a third diode.

[0018] The ACL firewire of the first relay connects the control interface of the first running gear of the fan, the positive electrode of the first relay connects the first power supply and the negative electrode of the third diode respectively, and the negative electrode of the first relay connects the positive electrode of the third diode and the first drive circuit respectively.

[0019] As an optional implementation, the second drive circuit comprises a fourth triode, a fifth triode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second electrolytic capacitor, a fourth diode, a fifth diode and a second capacitor.

[0020] The collector of the fourth triode connects the second relay circuit, one end of the base of the fourth triode connects the seventh resistor, the other end of the seventh resistor connects the second interlocking function circuit, one end of the eighth resistor and one end of the ninth resistor respectively, the emitter of the fourth triode connects the collector of the fifth triode, the base of the fifth triode connects the other end of the eighth resistor, one end of the eighth resistor connects the second interlocking function circuit and one end of the ninth resistor respectively, the emitter of the fifth triode connects one end of the tenth resistor, the negative electrode of the second electrolytic capacitor and the positive electrode of the fifth diode and is grounded, one end of the ninth resistor connects the second interlocking function circuit, the other end of the ninth resistor connects the other end of the tenth resistor, the positive electrode of the second electrolytic capacitor, the negative electrode of the fourth diode and the first interlocking function circuit respectively, the positive electrode of the fourth diode connects the negative electrode of the second capacitor and the negative electrode of the fifth diode respectively, the positive electrode of the second capacitor connects the controller, and the fourth triode and the fifth triode constitute a double failure protection triode TTL circuit.

[0021] As an optional implementation, the second interlocking function circuit comprises a sixth triode, an eleventh resistor and a twelfth resistor.

[0022] The collector of the sixth triode connects the second drive circuit, the emitter of the sixth triode connects one end of the eleventh resistor and is grounded, the base of the sixth triode connects the other end of the eleventh resistor and one end of the twelfth resistor respectively, and the other end of the twelfth resistor connects the first drive circuit.

[0023] As an optional implementation, the second relay circuit comprises a second relay, a second power supply and a sixth diode.

[0024] The ACL firewire of the second relay is connected to the control interface of the second running gear of the fan, the positive pole of the second relay is connected to the second power supply and the negative pole of the sixth diode respectively, and the negative pole of the second relay is connected to the positive pole of the sixth diode and the second driving circuit respectively.

[0025] As an optional implementation, the duty cycle of the PWM wave signal is 50%.

[0026] In a second aspect, an oil fume exhauster is provided, which comprises the fan driving circuit according to the first aspect.

[0027] The utility model provides a kind of fan driving circuit and oil fume exhauster, the technical scheme provided by the embodiment of the utility model at least brings following beneficial effects: discard the IO single level control relay circuit of prior art, adopt interlock function circuit drive, solve motor tap mutual short circuit. Through the interlock between each gear winding of the motor of fan, prevent accident, carry out accidental conduction protection. Using PWM driving method, in addition there is double failure protection triode TTL circuit combination, realize double failure protection, the stable voltage output of controller control. To improve the reliable use of household range hood motor drive. Improve the development efficiency of developer, shorten development cycle, improve product reliability lay great foundation.

[0028] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, can also obtain other drawings according to these drawings.

[0030] Figure 1 The structure diagram of the fan driving circuit of prior art provided by the embodiment of the utility model is shown in the figure.

[0031] Figure 2 The structure diagram of the fan driving circuit provided by the embodiment of the utility model is shown in the figure. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the utility model more clear, the following will be further described in detail by combining with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the utility model.

[0033] Figure 1 This is a schematic diagram of a prior art wind turbine drive circuit provided for an embodiment of this utility model. (See diagram below.) Figure 1 As shown, a single relay control circuit is used to switch the load, but it cannot guarantee that the taps of each motor position are mutually locked and work independently. Moreover, its single IO port control is prone to failure due to unexpected crashes, and the start-up process may cause safety risks of malfunction.

[0034] Figure 2 This is a schematic diagram of a fan drive circuit provided for an embodiment of the present utility model. (See attached diagram.) Figure 2 As shown, the driving circuit includes a first driving circuit 201, a second driving circuit 202, a first interlocking function circuit 203, a second interlocking function circuit 204, a first relay circuit 205, and a second relay circuit 206.

[0035] The first drive circuit 201 is connected to the first interlock function circuit 203, the first relay circuit 205, the second interlock function circuit 204 and the controller respectively. The first relay circuit 205 is connected to the control interface of the first operating position of the fan. The first interlock function circuit 203 is connected to the second drive circuit 202.

[0036] The second drive circuit 202 is connected to the second interlock function circuit 204, the second relay circuit 206, the first interlock function circuit 203 and the controller respectively. The second relay circuit 206 is connected to the control interface of the second operating position of the fan. The second interlock function circuit 204 is connected to the first drive circuit 201.

[0037] The first drive circuit 201 is used to receive the PWM wave signal sent by the controller, and is in a conducting state to supply power to the first relay circuit 205.

[0038] The second drive circuit 202 is used to receive the PWM wave signal sent by the controller, and is in a conducting state to supply power to the second relay circuit 206.

[0039] The first interlocking function circuit 203 is used to control the first driving circuit 201 to be disconnected when the second driving circuit 202 is turned on.

[0040] The second interlocking function circuit 204 is used to control the second drive circuit 202 to be disconnected when the first drive circuit 201 is turned on.

[0041] The first relay circuit 205 is used to be turned on when the first drive circuit 201 is turned on, so as to drive the fan to run at the first operating level.

[0042] The second relay circuit 2026 is used to turn on when the second driving circuit 202 is turned on, and drive the fan to run at the second running gear.

[0043] As an optional embodiment, the first driving circuit 201 comprises a first triode Q1, a second triode Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first electrolytic capacitor C11, a first diode D1, a second diode D2 and a first capacitor C21.

[0044] The collector of the first triode Q1 is connected to the first relay circuit 205, the base of the first triode Q1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the first interlocking function circuit 203, one end of the second resistor R2 and one end of the third resistor R3 respectively, the emitter of the first triode Q1 is connected to the collector of the second triode Q2, the base of the second triode Q2 is connected to the other end of the second resistor R2, one end of the second resistor R2 is connected to the first interlocking function circuit 203 and one end of the third resistor R3 respectively, the emitter of the second triode Q2 is connected to one end of the fourth resistor R4, the negative electrode of the first electrolytic capacitor C11 and the positive electrode of the second diode D2 and grounded, one end of the third resistor R3 is connected to the first interlocking function circuit 203, the other end of the third resistor R3 is connected to the other end of the fourth resistor R4, the positive electrode of the first electrolytic capacitor C11, the second interlocking function circuit 204 and the negative electrode of the first diode D1 respectively, the positive electrode of the first diode D1 is connected to the negative electrode of the first capacitor C21 and the negative electrode of the first diode D1 respectively, and the positive electrode of the first capacitor C21 is connected to the controller. In this way, when the PWM wave signal sent by the controller to the first driving circuit 201 is high level, the current charges the first electrolytic capacitor C11 through the first capacitor C21, the first diode D1 and the third resistor R3 until the level is stable. The current flows through the be junction of the second triode Q2 through the second resistor R2 and the third resistor R3, and the current is Ib_Q2, and the second triode Q2 is saturated and turned on. After the voltage of the first capacitor C21 is full, there is no current through the first diode D1. When the PWM wave signal sent by the controller to the first driving circuit 201 is low level, the first capacitor C21 is discharged through the second diode D2 and the first capacitor C21, and the first electrolytic capacitor C11 is discharged through the be junction of the second triode Q2 through the second resistor R2 and the third resistor R3, the current is Ib_Q2, and the second triode Q2 is saturated and turned on.

[0045] As an optional embodiment, the first triode Q1 and the second triode Q2 constitute a double failure protection triode TTL circuit. In this way, when any one of the first triode Q1 and the second triode Q2 fails and is short-circuited, the other triode can still be normally driven to work, avoiding safety risks.

[0046] As an optional implementation, the first interlocking function circuit 203 comprises a third transistor Q3, a fifth resistor R5, and a sixth resistor R6.

[0047] The collector of the third transistor Q3 is connected to the first drive circuit 201, the emitter of the third transistor Q3 is connected to one end of the fifth resistor R5 and grounded, the base of the third transistor Q3 is connected to the other end of the fifth resistor R5 and one end of the sixth resistor R6 respectively, and the other end of the sixth resistor R6 is connected to the second drive circuit 202. In this way, the third transistor Q3, the fifth resistor R5, and the sixth resistor R6 form a circuit with interlocking function through cross connection, and the working principle is as follows: when the first drive circuit 201 receives a PWM wave signal, the voltage of the first electrolytic capacitor C11 is 4.3V, the sixth transistor Q6 is saturated and turned on due to the voltage division of the peripheral static working point resistors, the eleventh resistor R11, and the twelfth resistor R12, Vbe_Q6≈0.7V, so the Vce_sat_Q6≈0V; at this time, Vbe_Q4≈0V is closed, so at this time, the second drive voltage 202 is connected to the control interface of the second running gear, the second relay REL2 is closed, thereby realizing the interlocking function of the gear of the fan.

[0048] As an optional implementation, the first relay circuit 205 comprises a first power supply 12V, a first relay REL1, and a third diode D3.

[0049] The ACL live wire of the first relay REL1 is connected to the control interface of the first running gear of the fan, the positive electrode of the first relay REL1 is connected to the first power supply 12V and the negative electrode of the third diode D3 respectively, and the negative electrode of the first relay REL1 is connected to the positive electrode of the third diode D3 and the first drive circuit 201 respectively.

[0050] As an optional implementation, the second drive circuit 202 comprises a fourth transistor Q4, a fifth transistor Q5, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second electrolytic capacitor C12, a fourth diode D4, a fifth diode D5, and a second capacitor C22.

[0051] The collector of the fourth transistor Q4 is connected to the second relay circuit 206, the base of the fourth transistor Q4 is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the second interlocking function circuit 204, one end of the eighth resistor R8 and one end of the ninth resistor R9 respectively, the emitter of the fourth transistor Q4 is connected to the collector of the fifth transistor Q5, the base of the fifth transistor Q5 is connected to the other end of the eighth resistor R8, one end of the eighth resistor R8 is connected to the second interlocking function circuit 204 and one end of the ninth resistor R9 respectively, the emitter of the fifth transistor Q5 is connected to one end of the tenth resistor R10, the negative electrode of the second electrolytic capacitor C12 and the positive electrode of the fifth diode D5 and grounded respectively, one end of the ninth resistor R9 is connected to the second interlocking function circuit 204, the other end of the ninth resistor R9 is connected to the other end of the tenth resistor R10, the positive electrode of the second electrolytic capacitor C12, the negative electrode of the fourth diode D4 and the first interlocking function circuit 203 respectively, the positive electrode of the fourth diode D4 is connected to the negative electrode of the second capacitor C22 and the negative electrode of the fifth diode D5 respectively, and the positive electrode of the second capacitor C22 is connected to the controller. In this way, when the PWM wave signal sent by the controller to the second drive circuit 202 is high level, the current charges the second electrolytic capacitor C12 through the second capacitor C22, the fourth diode D4 and the ninth resistor R9 until the level is stable. The current flows through the be junction of the fourth transistor Q4 through the eighth resistor R8 and the ninth resistor R9, and the current is Ib_Q4, and the fourth transistor Q4 is saturated and turned on. After the voltage of the second capacitor C22 is full, there is no current through the fourth diode D4. When the PWM wave signal sent by the controller to the second drive circuit 202 is low level, the second capacitor C22 is discharged through the fifth diode D5 and the second capacitor C22, and the second electrolytic capacitor C12 is discharged through the be junction of the fifth transistor Q5 through the eighth resistor R8 and the ninth resistor R9, and the current is Ib_Q5, and the fifth transistor Q5 is saturated and turned on.

[0052] As an optional implementation, the fourth transistor Q4 and the fifth transistor Q5 form a double failure protection transistor TTL circuit. In this way, when any one of the fourth transistor Q4 and the fifth transistor Q5 fails and is short-circuited, the other transistor can still be normally driven to work, avoiding safety risks.

[0053] As an optional implementation, the second interlocking function circuit 204 includes the sixth transistor Q6, the eleventh resistor R11 and the twelfth resistor R12.

[0054] The collector of the sixth transistor Q6 is connected to the second driving circuit 202, the emitter of the sixth transistor Q6 is connected to one end of the eleventh resistor R11 and grounded, the base of the sixth transistor Q6 is connected to the other end of the eleventh resistor R11 and one end of the twelfth resistor R12 respectively, and the other end of the twelfth resistor R12 is connected to the first driving circuit 201. In this way, the sixth transistor Q6, the eleventh resistor R11 and the twelfth resistor R12 form a circuit with interlocking function through cross connection, and the working principle is as follows: when the second driving circuit 201 receives the PWM wave signal, the voltage of the second electrolytic capacitor C12 is 4.3V, the Vbe_Q3 of the third transistor Q3 is about 0.7V due to the voltage division of the fifth resistor R5 and the sixth resistor R6, so the third transistor Q3 is saturated and turned on, and the Vce_sat_Q3 thereof is about 0V; at this time, Vbe_Q1 is about 0V and is closed, so at this time the first driving voltage 201 is connected to the control interface of the first running gear, the first relay REL1 is closed, thereby realizing the interlocking function of the gear of the fan.

[0055] As an optional embodiment, the second relay circuit 206 includes a second relay REL2, a second power supply 12V and a sixth diode D6.

[0056] The ACL live wire of the second relay REL2 is connected to the control interface of the second running gear of the fan, the positive electrode of the second relay REL2 is connected to the second power supply 12V and the negative electrode of the sixth diode D6 respectively, and the negative electrode of the second relay REL2 is connected to the positive electrode of the sixth diode D6 and the second driving circuit 202 respectively.

[0057] As an optional embodiment, the duty ratio of the PWM wave signal is 50%. When the PWM wave signal sent by the controller to the first driving circuit 201 is high, the first capacitor C21 is full of voltage, and then there is no current through the first diode D1, at this time the first electrolytic capacitor C11 discharges through the be junction of the second transistor Q2 via the second resistor R2 and the third resistor R3 until the voltage of the be junction of the second transistor is less than Vbe_sat=0.3V, and then the second transistor Q2 is closed. When the PWM wave signal sent by the controller to the first driving circuit 201 is low, the first electrolytic capacitor C11 discharges through the be junction of the second transistor Q2 via the second resistor R2 and the third resistor R3, and when the voltage of the first electrolytic capacitor C11 is discharged to less than Vbe_sat=0.3V, the second transistor Q2 is closed. Therefore, in order to realize the continuous conduction of the second transistor Q2, the PWM duty ratio is designed to be 50% to keep the second transistor Q2 continuously conducting, and in the case of accidental crash, when the level of the pin connected to the controller of the first driving circuit 201 is always high or always low, the second transistor Q2 is closed to avoid safety risks.

[0058] Further, the oil fume machine includes the fan driving circuit introduced in the above Figure 2 The fan driving circuit is not repeated here.

[0059] The utility model embodiment provides a fan driving circuit, has discarded the single level control relay circuit of IO of prior art, adopts interlock function circuit drive, solves the mutual short circuit between motor taps. Through the interlock between each gear winding of the motor of fan, prevent accidents, carry out accidental conduction protection. Adopt PWM drive method, in addition there is double failure protection triode TTL circuit combination, realizes double failure protection, controller control's regulated output. Thus has promoted household range hood motor drive reliable use. Improve the development efficiency of developer, shorten the development cycle, improve product reliability lays great foundation.

[0060] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, it can include the processes of the above-mentioned embodiments. Any reference to memory, storage, database or other medium in each embodiment provided by the utility model can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM) and memory bus dynamic RAM (RDRAM).

[0061] It should be noted that the relative terms, such as first and second, and the like, are used herein only to distinguish one entity or operation from another, and do not necessarily require or imply any actual such relationship or order between such entities or operations. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element preceded by "comprises a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the recited element.

[0062] It should also be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for display, analyzed data, etc.) involved in the utility model are all information and data authorized by the user or fully authorized by all parties.

[0063] Each embodiment in the specification is described in a related manner, and the same or similar parts between each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the related parts can be referred to the part of the method embodiment.

[0064] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, not all possible combinations of the technical features in the above embodiments are described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the specification.

[0065] The above-described embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the invention patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the utility model, some modifications and improvements can be made, which are within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. A fan drive circuit, characterized by comprising: The fan driving circuit comprises a first driving circuit, a second driving circuit, a first interlocking function circuit, a second interlocking function circuit, a first relay circuit and a second relay circuit; wherein, The first driving circuit is connected with the first interlocking function circuit, the first relay circuit, the second interlocking function circuit and a controller respectively, the first relay circuit is connected with a control interface of a first running gear of a fan, and the first interlocking function circuit is connected with the second driving circuit. The second driving circuit is connected with the second interlocking function circuit, the second relay circuit, the first interlocking function circuit and the controller respectively, the second relay circuit is connected with a control interface of a second running gear of the fan, and the second interlocking function circuit is connected with the first driving circuit. The first driving circuit is used for receiving a PWM wave signal sent by the controller and being in a conduction state to supply power to the first relay circuit. The second driving circuit is used for receiving a PWM wave signal sent by the controller and being in a conduction state to supply power to the second relay circuit. The first interlocking function circuit is used for controlling the first driving circuit to be off when the second driving circuit is on. The second interlocking function circuit is used for controlling the second driving circuit to be off when the first driving circuit is on. The first relay circuit is used for being on to drive the fan to run according to the first running gear when the first driving circuit is on. The second relay circuit is used for being on to drive the fan to run according to the second running gear when the second driving circuit is on.

2. The drive circuit according to claim 1, characterized in that, The first driving circuit comprises a first triode, a second triode, a first resistor, a second resistor, a third resistor, a fourth resistor, a first electrolytic capacitor, a first diode, a second diode and a first capacitor. The collector of the first triode is connected with the first relay circuit, one end of the base of the first triode is connected with the first resistor, the other end of the first resistor is connected with the first interlocking function circuit, one end of the second resistor and one end of the third resistor respectively, the emitter of the first triode is connected with the collector of the second triode, the base of the second triode is connected with the other end of the second resistor, one end of the second resistor is connected with the first interlocking function circuit and one end of the third resistor respectively, the emitter of the second triode is connected with one end of the fourth resistor, the negative electrode of the first electrolytic capacitor and the positive electrode of the second diode and grounded, one end of the third resistor is connected with the first interlocking function circuit, the other end of the third resistor is connected with the other end of the fourth resistor, the positive electrode of the first electrolytic capacitor, the second interlocking function circuit and the negative electrode of the first diode respectively, the positive electrode of the first diode is connected with the negative electrode of the first capacitor and the negative electrode of the first diode respectively, the positive electrode of the first capacitor is connected with the controller, and the first triode and the second triode constitute a double failure protection triode TTL circuit.

3. The drive circuit according to claim 1, characterized by The first interlocking function circuit comprises a third triode, a fifth resistor and a sixth resistor; The collector of the third triode is connected to the first drive circuit, the emitter of the third triode is connected to one end of the fifth resistor and grounded, and the base of the third triode is connected to the other end of the fifth resistor and one end of the sixth resistor respectively, and the other end of the sixth resistor is connected to the second drive circuit.

4. The drive circuit according to claim 1, characterized by The first relay circuit comprises a first power supply, a first relay and a third diode; The ACL firewire of the first relay is connected to the control interface of the first running gear of the fan, the positive pole of the first relay is connected to the first power supply and the negative pole of the third diode respectively, and the negative pole of the first relay is connected to the positive pole of the third diode and the first drive circuit respectively.

5. The drive circuit according to claim 1, characterized by The second drive circuit comprises a fourth triode, a fifth triode, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second electrolytic capacitor, a fourth diode, a fifth diode and a second capacitor; The collector of the fourth triode is connected to the second relay circuit, the base of the fourth triode is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the second interlocking function circuit, one end of the eighth resistor and one end of the ninth resistor respectively, the emitter of the fourth triode is connected to the collector of the fifth triode, the base of the fifth triode is connected to the other end of the eighth resistor, one end of the eighth resistor is connected to the second interlocking function circuit and one end of the ninth resistor respectively, the emitter of the fifth triode is connected to one end of the tenth resistor, the negative pole of the second electrolytic capacitor and the positive pole of the fifth diode and grounded, one end of the ninth resistor is connected to the second interlocking function circuit, the other end of the ninth resistor is connected to the other end of the tenth resistor, the positive pole of the second electrolytic capacitor, the negative pole of the fourth diode and the first interlocking function circuit respectively, the positive pole of the fourth diode is connected to the negative pole of the second capacitor and the negative pole of the fifth diode respectively, the positive pole of the second capacitor is connected to the controller, and the fourth triode and the fifth triode constitute a double failure protection triode TTL circuit.

6. The drive circuit of claim 1, wherein The second interlocking function circuit comprises a sixth triode, an eleventh resistor and a twelfth resistor; The collector of the sixth triode is connected to the second drive circuit, the emitter of the sixth triode is connected to one end of the eleventh resistor and grounded, and the base of the sixth triode is connected to the other end of the eleventh resistor and one end of the twelfth resistor respectively, and the other end of the twelfth resistor is connected to the first drive circuit.

7. The drive circuit of claim 1, wherein The second relay circuit comprises a second relay, a second power supply and a sixth diode; The ACL firewire of the second relay is connected to the control interface of the second running gear of the fan, the positive pole of the second relay is connected to the second power supply and the negative pole of the sixth diode respectively, and the negative pole of the second relay is connected to the positive pole of the sixth diode and the second drive circuit respectively.

8. The drive circuit of claim 1, wherein, The duty cycle of the PWM wave signal is 50%.

9. A range hood characterized by The range hood includes the fan drive circuit as claimed in any one of claims 1 to 8.

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