CN211859996U - Brushless motor working circuit and cooking machine - Google Patents

Abstract

The utility model provides a brushless motor working circuit and cooking machine. The brushless motor working circuit comprises a motor driving circuit for driving the brushless motor, a first rectifying circuit for supplying power to the brushless motor, an energy storage element connected between the first rectifying circuit and the motor driving circuit, a first controller, a cup cover detection circuit and an isolating switch circuit. The first controller is used for generating a motor driving signal to control the motor driving circuit and is provided with a motor driving signal enabling end enabling or disabling the motor driving signal. The cup cover detection circuit outputs a cup cover state signal with a cup cover opening signal and a cup cover closing signal. The isolating switch circuit is connected between the cup cover detection circuit and the first controller. When a cup cover opening signal is received, the isolating switch circuit enables the enabling end of the motor driving signal to be de-energized; when a cup cover closing signal is received, the isolating switch circuit enables the enabling end of the motor driving signal. The utility model discloses a circuit is reliable, with low costs.

Description

Brushless motor working circuit and cooking machine

Technical Field

The utility model relates to the technical field of household appliances, especially, relate to a brushless motor working circuit and cooking machine.

Background

With the increasing living standard of people, many different types of food processors appear on the market. The functions of the food processor mainly include, but are not limited to, functions of making soybean milk, grinding dry powder, squeezing juice, making minced meat, shaving ice, making coffee, preparing beauty mask for women and the like. The food processor can comprise a soybean milk machine, a stirrer, a wall breaking machine and the like. The different kinds of functions enrich the life of people.

The food processor stirs or crushes the food materials through the rotation of the motor-driven rotary knife assembly. The brushless motor does not have the carbon brush, so that the service life of the brushless motor is longer compared with that of a brush motor. Brushless motor is applied to the brushless broken wall machine of direct current. The brushless motor is controlled by a brushless motor operating circuit. The existing brushless motor working circuit usually adopts software logic to start and close the brushless motor according to the opening and closing state of the cup cover, however, certain safety risk exists in the adoption of software logic control.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can lower brushless motor working circuit of hardware control brushless motor and cost and cooking machine.

An aspect of the utility model provides a brushless motor working circuit is applied to in the cooking machine. The brushless motor working circuit comprises a motor driving circuit for driving the brushless motor, a first rectifying circuit, an energy storage element, a first controller, a cup cover detection circuit and an isolating switch circuit. The first rectifying circuit is connected to a power supply and used for supplying power to the brushless motor. The energy storage element is connected between the first rectifying circuit and the motor driving circuit. The first controller is used for generating a motor driving signal to control the motor driving circuit, and the first controller is provided with a motor driving signal enabling end used for enabling or disabling the motor driving signal. The cup cover detection circuit outputs a cup cover state signal for detecting the opening and closing of the cup cover of the food processor, and the cup cover state signal has a cup cover opening signal and a cup cover closing signal. The isolating switch circuit is connected between the cup cover detection circuit and the first controller. When the isolating switch circuit receives the cup cover opening signal, the isolating switch circuit enables the motor driving signal enabling end of the first controller to be disabled so that the brushless motor cannot work; when the isolating switch circuit receives the cup cover closing signal, the isolating switch circuit enables the motor driving signal enabling end of the first controller.

Further, the brushless motor working circuit further comprises an anti-surge circuit. The surge protection circuit is connected between the power supply and the first rectifying circuit, wherein the surge protection circuit comprises a relay and a first resistor which are connected in parallel. The anti-surge circuit can avoid damage of surge to other equipment in the loop, and can play a role in power-on charging protection of an energy storage element of the brushless motor.

Furthermore, the isolating switch circuit comprises a first optical coupling isolating circuit, the input stage of the first optical coupling isolating circuit is connected with the cup cover detection circuit, and the output stage of the first optical coupling isolating circuit is connected with the motor driving signal enabling end of the first controller. The first optical coupling isolation circuit has good isolation effect on input and output electric signals, so that the safety of the circuit is improved.

Further, the first optical coupling isolation circuit comprises a light emitting diode and a phototriode, the anode of the light emitting diode is connected with a first direct current power supply end, the cathode of the light emitting diode is connected to the cup cover detection circuit through a second resistor, the collector of the phototriode is connected with a second direct current power supply end, the emitter of the phototriode is connected to the ground through a third resistor, and the emitter of the phototriode is connected to the motor driving signal enabling end of the first controller. The second resistor is a current-limiting resistor, and the third resistor is a pull-down resistor.

Further, the cathode of the light emitting diode is also connected to the ground through the first capacitor. The first capacitor functions as a filter.

Furthermore, a second capacitor is connected in parallel to two ends of the third resistor. The second capacitor acts as a filter.

Further, the brushless motor working circuit further comprises a second controller and a second optical coupling isolation circuit, and the second optical coupling isolation circuit is connected between the first controller and the second controller. The second optical coupling isolation circuit can isolate the power supply of the first controller and the second controller, and two controllers are adopted, so that the processing capacity of the controllers can be improved.

Furthermore, the second controller is connected to the cup cover detection circuit and used for receiving the cup cover state signal output by the cup cover detection circuit. Thus, double protection control of the brushless motor can be performed.

Further, the brushless motor working circuit further comprises a second rectifying circuit connected to the power supply and a switching power supply circuit connected between the second rectifying circuit and the first controller. The second rectifying circuit is used for supplying power to the switching power supply circuit. Therefore, when the whole machine is powered on or powered off, the power supply circuit and the switching power supply circuit of the brushless motor are not influenced mutually, and the energy storage element does not influence the switching power supply circuit part.

Another aspect of the utility model provides a food processer, its including inside be provided with brushless motor's host computer, detachably install in cup subassembly, detachably on the host computer install in cup subassembly last bowl cover and as above be used for control brushless motor's brushless motor control circuit.

The utility model discloses a brushless motor working circuit and have cooking machine of this brushless motor working circuit can play the effect of hard switch to motor drive signal to can avoid just can start and close the safety risk that the motor brought after handling through software logic.

The utility model discloses a brushless motor working circuit and have cooking machine of this brushless motor working circuit can improve control chip's life.

The utility model discloses a brushless motor working circuit and have cooking machine safe and reliable, with low costs of this brushless motor working circuit.

Drawings

FIG. 1 is a schematic circuit diagram of an operating circuit of a brushless motor;

FIG. 2 is a circuit schematic diagram of an alternative operating circuit for a brushless motor;

FIG. 3 is a schematic circuit diagram of an operating circuit of another brushless motor;

fig. 4 is a schematic perspective view of a food processor according to an embodiment of the present invention;

fig. 5 is a schematic circuit diagram of an operating circuit of a brushless motor according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. Unless otherwise indicated, "front", "rear", "lower" and/or "upper" and the like are for convenience of description and are not limited to one position or one spatial orientation. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be noted that, in order to better embody the innovative features of the present invention, only the structural features closely related to the creation point of the present invention are shown and described in the drawings and the description thereof, and other less related structural features or other existing structural features are omitted or outlined. However, this does not mean that the brushless motor operating circuit and the food processor of the present invention do not necessarily include these other structural features, and the brushless motor operating circuit and the food processor of the present invention may include other structural features necessary for realizing the basic functions of the food processor.

Fig. 1 discloses a circuit diagram of a brushless motor operating circuit 100 applied to a dc brushless wall breaking machine. As shown in fig. 1, the brushless motor operating circuit 100 includes a cup lid detection circuit 110. In this brushless motor working circuit 100, when the cup lid of the dc brushless wall breaking machine is opened and closed, the cup lid state signal CAP is detected by the keypad control chip MCU2, the UART instruction of the serial port 134 is transmitted to the power board motor driver MCU1 through the UART (Universal Asynchronous Receiver/Transmitter ) according to the cup lid state signal CAP, the power board motor driver MCU1 controls the signal state of the motor driver circuit 103 according to the instruction, thereby controlling the start and stop of the brushless motor M.

However, the detection of the cup cover state signal CAP by the keypad control chip MCU2 needs to be realized through the keypad control chip MCU2 software logic, which presents a certain risk. Moreover, the keypad control chip MCU2 conveys the instruction to the power board motor driver chip MCU1, needs to communicate through the UART serial port 134, and the UART serial port 134 communication needs the implementation of software logic as well, and the communication is easily disturbed by power clutter, causes communication anomaly, and if the brushless motor M is required to shut down and not shut down in time at this moment, will cause certain risk.

Fig. 2 discloses a circuit diagram of a brushless motor operating circuit 200 of another dc brushless wall breaking machine. As shown in fig. 2, the brushless motor operating circuit 200 includes a cup lid detecting circuit 210. In the brushless motor working circuit 200, a control signal VC is output according to a cup cover state signal CAP detected by the keypad control chip MCU2, and the control signal VC directly controls the power enable of the power board motor driving chip MCU1 through hardware, so that the cup cover state signal CAP detected by the keypad control chip MCU2 is directly used for controlling the start and stop of the brushless motor M. When the cup cover of the direct current brushless wall breaking machine is closed, the power supply of the motor driving chip MCU1 is enabled; when the cup cover is opened, the power supply of the motor driving chip MCU1 is disabled, so that the brushless motor M can not be started, and the risk caused by the complex software evaluation required by the brushless motor working circuit 100 shown in figure 1 is effectively avoided. However, the control method of the brushless motor operating circuit 200 in fig. 2 is likely to cause a certain damage to the motor driving chip MCU1, and frequent operation may reduce the service life of the motor driving chip MCU 1.

Fig. 3 discloses a circuit diagram of a brushless motor operating circuit 300 of another dc brushless wall breaking machine. As shown in fig. 3, the brushless motor operating circuit 300 includes a lid detection circuit 310. In the brushless motor working circuit 300, the cup cover state signal CAP detected by the keypad control chip MCU2 directly controls the relay RLY3 connected to the bus of the brushless motor M, thereby controlling the on and off of the bus of the brushless motor M. When the cup cover of the direct current brushless wall breaking machine is closed, the bus of the brushless motor M is opened; when the cup cover is opened, the bus of the brushless motor M is closed, so that the brushless motor M can be ensured not to be started, and the risk caused by the complex software evaluation required by the brushless motor working circuit 100 shown in fig. 1 is also avoided. However, the control method of the brushless motor operating circuit 300 of fig. 3 requires the use of the relay RLY 3. However, since the cost of the relay is high, it results in an increase in the cost of the entire product and an increase in the occupied space of a Printed Circuit Board (PCB).

In view of this, the utility model provides an improved brushless motor working circuit.

Fig. 4 shows a perspective view of the food processor 10 according to an embodiment of the present invention. As shown in fig. 4, the food processor 10 according to an embodiment of the present invention includes a main body 11 and a cup body assembly 12. The food processor 10 can be a blender, a wall breaking machine, a soymilk maker or a juice extractor, etc.

In one embodiment, the host 11 is in the form of a stand. The host 11 can provide power, control and drive the food processor 10 to work, and can interact with the user. The host 11 includes a host housing 111, a main control board (not shown), and a touch panel 112 mounted on the host housing 111. The main body case 111 can house a brushless motor M (shown in fig. 5). The top of the host 11 may be provided with a host coupler (not shown).

The cup assembly 12 is detachably mounted to the main body 11, and may be separated from the main body when necessary. The cup body assembly 12 can contain food materials, and the food materials can be stirred, heated and/or vacuumized in the cup body assembly 12. A rotary knife assembly (not shown) can be assembled in the cup body assembly 12, the rotary knife assembly is connected with a rotating shaft of the brushless motor M, and the brushless motor M can drive the rotary knife assembly to rotate. The rotating knife assembly can be set as a stirring knife assembly, a wall breaking knife assembly or a juicing wheel assembly and the like.

The cup body assembly 12 includes a cup handle 121 disposed on one side. In one embodiment, the cup body assembly 12 includes a heating assembly (not shown) assembled to the bottom of the cup body assembly 12, such as a heating plate provided with a heating tube or an electromagnetic heating plate, which can be used to heat the food material. The rotary knife assembly can be assembled on the heating disc. The heating plate may be assembled with a Temperature sensor, such as an NTC (Negative Temperature Coefficient) sensor, for sensing the Temperature of the food material in the cup body assembly 12. In one embodiment, a cup coupler (not shown) is provided on the top of the cup assembly 12 and may protrude above the top surface of the cup handle 121. A cup coupler (not shown) is disposed at the bottom of the cup assembly 12, and the cup coupler is electrically connected to the cup coupler, for example, the cup coupler and the cup coupler can be electrically connected through a wire or a metal conductive member. Also, the cup coupler may be electrically pluggable with the host coupler.

The food processor 10 further comprises a cup cover 13, and the cup cover 13 can cover the cup body assembly 12. When the food processor 10 works, the cup cover 13 can be covered on the cup body assembly 12 to seal the cup opening of the cup body assembly 12. After the food processor 10 finishes working, the cup cover 13 can be taken down from the cup body assembly 12. In some embodiments, the cup lid 13 can be opened to add food during the cooking process of the cooking machine 10. Lid 13 includes lid handle 131. When lid 13 is closed on cup assembly 12, lid handle 131 is abutted to cup handle 121 and lid 13 is in place. In one embodiment, lid 13 may be screwed onto cup assembly 12 and rotated into position such that lid 13 covers cup assembly 12.

In one embodiment, lid 13 is provided with a lid coupler (not shown) that may be assembled within lid handle 131. When lid 13 is closed on cup assembly 12, a lid coupler on lid 13 may be electrically mated with a cup coupler on cup assembly 12.

In one embodiment, the food processor 10 may further include an exhaust cover 14 assembled to the lid 13, and the steam in the cup assembly 12 may be exhausted from a gap between the lid 13 and the exhaust cover 14.

The food processor 10 includes a brushless motor operating circuit 400 for controlling the brushless motor M. At least a portion of the brushless motor operating circuit 400 may be disposed on a main control board within the host 11. Fig. 5 shows a circuit diagram of a brushless motor operating circuit 400 according to an embodiment of the present invention. As shown in fig. 5, the brushless motor operating circuit 400 according to an embodiment of the present invention includes a cup lid detecting circuit 410, an isolating switch circuit 420, a first rectifying circuit 401, an energy storage element 402, a motor driving circuit 403 for driving the brushless motor M, and a first controller 404.

The lid detection circuit 410 can output a lid status signal CAP for detecting the opening and closing of the lid 13 of the food processor 10, wherein the lid status signal CAP has a lid opening signal and a lid closing signal. In one embodiment, the lid detect circuit 410 may include a resistor R4, a resistor R5 and a lid switch K1 connected in series between the first dc power supply terminal VDD and the ground GND 2. The connection point of the resistor R4 and the resistor R5 leads out a cup cover state signal CAP. A pair of contacts of lid switch K1 may be separately disposed on a cup coupler of cup assembly 12, and a trigger of lid switch K1 may be disposed on a lid coupler of lid 13. Thus, when lid 13 is closed on cup assembly 1222, the trigger of lid switch K1 may cause a pair of contacts of lid switch K1 to electrically connect, lid switch K1 to close, and lid detect circuit 410 outputs a low level lid close signal. When the lid 13 is opened, the lid detection circuit 410 outputs a lid open signal at a high level.

In one embodiment, the lid detect circuit 410 may further include a filter capacitor C3 connected in parallel across the resistor R5 and the lid switch K1.

The first rectifying circuit 401 is connected to the live line L and the neutral line N of the power supply, and is configured to rectify an ac strong current into a dc current to supply power to the brushless motor M.

The energy storage element 402 is connected between the first rectifier circuit 401 and the motor drive circuit 403. The energy storage element 402 may be, for example, an electrolytic capacitor. The energy storage element 402 may play a role of filtering, so as to stably supply the power voltage to the brushless motor M, and ensure that the power voltages at the two ends of the brushless motor M are more stable.

The first Controller 404 may be, for example, a single chip microcomputer (MCU, Micro-Controller Unit) or the like. The first controller 404 may generate a motor driving signal, for example, a PWM driving signal to control the motor driving circuit 403, and the first controller 404 has a motor driving signal enable terminal MotorEN for enabling or disabling the motor driving signal.

The isolator circuit 420 is coupled between the lid detect circuit 410 and the first controller 404. The isolation switch circuit 420 may receive the lid status signal CAP output by the lid detection circuit 410. When the isolating switch circuit 420 receives the cup lid opening signal, the isolating switch circuit 420 can disable the MotorEN at the motor driving signal enabling end of the first controller 404, so that the motor driving signal of the first controller 404 is disabled and the brushless motor M cannot work. When the isolating switch circuit 420 receives the cup lid closing signal, the isolating switch circuit 420 enables the MotorEN of the motor driving signal enabling end of the first controller 404, so that the motor driving signal of the first controller 404 is enabled, and the brushless motor M can work.

In the motor-driven working circuit 400 of the present invention, the cup lid state signal CAP outputted by the cup lid detecting circuit 410 can directly enable or disable the motor-driven signal of the first controller 404 through the isolating switch circuit 420. The isolation switch circuit 420 may act as a hard switch for the motor drive signal.

In some embodiments, the brushless motor operating circuit 400 of the present invention further comprises an anti-surge circuit 431. The surge preventing circuit 431 is connected between the power supply and the first rectifying circuit 401. The anti-surge circuit 431 can conduct and shunt in a very short time when a spike current or voltage is suddenly generated, so that damage of a surge to other equipment in a loop is avoided, and a power-on charging protection effect on the energy storage element 403 of the brushless motor M can be achieved. Anti-surge circuit 431 includes relay RLY and first resistor R1 connected in parallel. The first resistor R1 functions as a current limiter. The relay RLY is a bypass relay.

In some embodiments, the isolation switch circuit 420 includes a first optical coupling isolation circuit U1, an input stage of the first optical coupling isolation circuit U1 is connected to the lid detection circuit 410, and an output stage of the first optical coupling isolation circuit U1 is connected to a motor driving signal enable terminal motoreen of the first controller 404. The first optical coupler isolation circuit U1 has good isolation effect on input and output electric signals, so that the safety of the circuit is improved.

The first optical coupling isolation circuit U1 comprises a light emitting diode D and a phototriode Q, the anode of the light emitting diode D is connected with a first direct current power supply end VDD, the cathode of the light emitting diode D is connected to the cup cover detection circuit 410 through a second resistor R2, the collector of the phototriode Q is connected with a second direct current power supply end VCC, the emitter of the phototriode Q is connected to a ground GND1 through a third resistor R3, and the emitter of the phototriode Q is connected to a motor driving signal enabling end MotorEN of the first controller 404. The second resistor R2 is a current limiting resistor, and the third resistor R3 is a pull-down resistor.

In one embodiment, the cathode of the led D is further connected to the ground GND2 through a first capacitor C1, and the first capacitor C1 may function as a filter. In another embodiment, a second capacitor C2 is connected in parallel to the third resistor R3, and the second capacitor C2 can perform a filtering function.

The input terminal of the isolating switch circuit 420 is connected to the CAP status signal CAP, and the output terminal thereof is connected to the motor driving signal enable terminal motoreen of the first controller 404. When lid 13 is opened from closed, lid status signal CAP changes from low level to high level, and MotorEN of motor drive signal enable terminal of first controller 404 jumps from high level to low level, thereby turning off motor drive signal inside first controller 404, i.e., turning off brushless motor M. When the lid 13 is opened to closed, the lid state signal CAP is switched from high level to low level, and the motor driving signal enable terminal motoreen of the first controller 404 is switched from low level to high level, so that the brushless motor driving signal of the first controller 404 is enabled, that is, the brushless motor M can be turned on.

In some embodiments, the brushless motor operating circuit 400 of the present invention further comprises an electromagnetic compatibility circuit (EMC) 432. The electromagnetic compatibility circuit 432 is connected between the power supply and the first rectification circuit 401. In one embodiment, an electromagnetic compatibility circuit 432 is connected between the power supply and the anti-surge circuit 431. The electromagnetic compatibility circuit 432 can reduce the interference of the electric network to the food processor 10, the interference of the food processor 10 to the electric network, and the like.

In some embodiments, the brushless motor operating circuit 400 of the present invention further includes a second controller 433 and a second optical coupler and isolator circuit 434. The second Controller 433 may be, for example, a single chip microcomputer (MCU, Micro-Controller Unit) or the like. The second optical coupler isolation circuit 434 is connected between the first controller 404 and the second controller 433, and the second optical coupler isolation circuit 434 can perform power isolation on the first controller 404 and the second controller 433.

The utility model discloses an among brushless motor operating circuit 400, first controller 404 is power strip drive motor control chip for control brushless motor M, and second controller 433 is keypad control chip, is used for controlling touch panel and shows, controls motor control and panel display separately through two independent controllers respectively, thereby improves the throughput of controller.

In some embodiments, second controller 433 is coupled to lid detection circuitry 410 for receiving lid state signal CAP output by lid detection circuitry 410. In addition, the second controller 433 may inform the first controller 404 of the communication through the second optical coupler/isolator circuit 434 to start or shut down the brushless motor M, so that dual protection control of the brushless motor M may be performed.

In some embodiments, the brushless motor operating circuit 400 of the present invention further includes a second rectifying circuit 435 and a switching power supply circuit 436. A second rectifying circuit 435 is connected to the live L and neutral N lines of the power supply, for example to the electromagnetic compatibility circuit 432, for rectifying a strong alternating current into a direct current for powering the switching power supply circuit 436. The switching power supply circuit 436 is connected between the second rectifying circuit 435 and the first controller 404.

The utility model discloses an among brushless motor working circuit 400, brushless motor M's supply circuit and switching power supply circuit 436 adopt first rectifier circuit 401 and second rectifier circuit 435 to keep apart respectively, consequently, when the complete machine power-on with fall the electric time, brushless motor M's supply circuit and switching power supply circuit 436 do not influence each other, energy storage component 402 can not lead to the fact the influence to switching power supply circuit 436 part.

The brushless motor operating circuit 400 of the present invention solves the risk that the brushless motor operating circuit 100 shown in fig. 1 needs to be logically processed by software to start and close the motor.

The brushless motor operating circuit 400 of the present invention solves the risk of the reduction in the life of the chip that may be caused by the brushless motor operating circuit 200 shown in fig. 2.

The utility model discloses a brushless motor operating circuit 400 has solved the brushless motor operating circuit 300 shown in figure 3 relay cost higher, extravagant PCB usage space scheduling problem.

The utility model discloses a brushless motor working circuit 400 utilizes lower cost, ensures that electrical apparatus can not the mistake start and harm the user, guarantees user safe in utilization.

The utility model discloses a cooking machine 10 has with the utility model discloses a motor drive operating circuit 400 is similar useful technological effect roughly, so, no longer gives unnecessary details here.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a brushless motor working circuit, is applied to in cooking machine (10), its characterized in that: the brushless motor operating circuit (400) includes:

a motor drive circuit (403) for driving the brushless motor;

a first rectifying circuit (401) connected to a power supply for supplying power to the brushless motor;

an energy storage element (402) connected between the first rectifier circuit (401) and the motor drive circuit (403);

a first controller (404) for generating a motor drive signal to control the motor drive circuit (403), the first controller (404) having a motor drive signal enable terminal for enabling or disabling the motor drive signal;

the cup cover detection circuit (410) outputs a cup cover state signal for detecting the opening and closing of a cup cover of the food processor (10), and the cup cover state signal comprises a cup cover opening signal and a cup cover closing signal; and

an isolation switch circuit (420) connected between the lid detection circuit (410) and the first controller (404),

when the isolating switch circuit (420) receives the cup cover opening signal, the isolating switch circuit (420) enables the motor driving signal enabling end of the first controller (404) to be disabled so that the brushless motor cannot work; when the isolating switch circuit (420) receives the cup cover closing signal, the isolating switch circuit (420) enables the motor driving signal enabling end of the first controller (404).

2. The operating circuit of a brushless motor as claimed in claim 1, wherein: the brushless motor operating circuit (400) further comprises:

an anti-surge circuit (431) connected between the power supply and the first rectifying circuit (401),

wherein the surge protection circuit (431) comprises a relay and a first resistor which are connected in parallel.

3. The operating circuit of a brushless motor as claimed in claim 1, wherein: the isolation switch circuit (420) comprises a first optical coupling isolation circuit, the input stage of the first optical coupling isolation circuit is connected with the cup cover detection circuit (410), and the output stage of the first optical coupling isolation circuit is connected with the motor driving signal enabling end of the first controller (404).

4. The operating circuit of a brushless motor as claimed in claim 3, wherein: the first optical coupling isolation circuit comprises a light emitting diode and a phototriode, the anode of the light emitting diode is connected with a first direct current power supply end, the cathode of the light emitting diode is connected to the cup cover detection circuit (410) through a second resistor, the collector of the phototriode is connected with a second direct current power supply end, the emitter of the phototriode is connected to the ground through a third resistor, and the emitter of the phototriode is connected to the motor driving signal enabling end of the first controller (404).

5. The operating circuit of a brushless motor as claimed in claim 4, wherein: the cathode of the light emitting diode is also connected to the ground through the first capacitor.

6. The operating circuit of a brushless motor as claimed in claim 4, wherein: and a second capacitor is connected in parallel at two ends of the third resistor.

7. The operating circuit of a brushless motor as claimed in claim 1, wherein: further comprising:

a second controller (433); and

a second light-coupled isolation circuit (434) connected between the first controller (404) and the second controller (433).

8. The operating circuit of a brushless motor as claimed in claim 7, wherein: the second controller (433) is connected to the lid detection circuit (410) and is used for receiving the lid state signal output by the lid detection circuit (410).

9. The operating circuit of a brushless motor as claimed in claim 1, wherein: further comprising:

a second rectification circuit (435) connected to the power supply; and

a switching power supply circuit (436) connected between the second rectification circuit (435) and the first controller (404),

wherein the second rectifying circuit (435) is used for supplying power to the switching power supply circuit (436).

10. A cooking machine, its characterized in that: the method comprises the following steps:

the motor comprises a main machine (11), wherein a brushless motor is arranged in the main machine (11);

the cup body assembly (12) is detachably arranged on the main machine (11);

the cup cover (13) is detachably arranged on the cup body assembly (12); and

the brushless motor operating circuit (400) for controlling the brushless motor according to any of claims 1 to 9.

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