CN210697335U - Motor control circuit and cooking machine - Google Patents

Abstract

The application provides a motor control circuit and cooking machine. And the motor control circuit is used for controlling the motor of the food processor. The motor control circuit comprises a power supply circuit, a driving circuit, an electric control switch circuit and a main controller. The power circuit is connected with a power supply. The driving circuit is connected with the motor and the power supply. The electric control switch circuit comprises an electric control switch connected with the power circuit, the electric control switch is connected in a loop formed by connecting the driving circuit, the motor and the power supply, and the loop formed by connecting the driving circuit, the motor and the power supply is switched on and off. The main controller comprises a drive control port connected with the drive circuit and a switch control port connected with the electric control switch circuit. After the main controller controls the electric control switch to be conducted through the switch control port, the driving circuit is controlled to drive the motor through the driving control port. The food processor comprises a host, a cup assembly and a motor control circuit. The main machine comprises a motor. The cup assembly can be assembled to the main machine. The motor control circuit is connected with the motor and controls the motor. The safety is improved.

Description

Motor control circuit and cooking machine

Technical Field

The application relates to the field of small household appliances, in particular to a motor control circuit and a food processor.

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, squeezing fruit juice, making rice paste, mincing meat, shaving ice, making coffee and/or blending facial masks and the like. The food processor can comprise a soybean milk machine, a stirrer or a wall breaking food processor and other machines for crushing and stirring food materials.

The food processor comprises a motor and a motor control circuit, and the motor control circuit controls the motor. The motor control circuit comprises a driving circuit for driving the motor, and the driving circuit is interfered and possibly triggered by mistake in a standby state, so that the motor runs and potential safety hazards are brought.

SUMMERY OF THE UTILITY MODEL

The application provides a modified motor control circuit and cooking machine.

One aspect of the application provides a motor control circuit for control cooking machine's motor includes: the power supply circuit is connected with a power supply; a drive circuit connected to the motor and the power supply; the electric control switch circuit comprises an electric control switch connected with the power circuit, and the electric control switch is connected in a loop connected with the driving circuit, the motor and the power supply and is used for switching on and off the loop connected with the driving circuit, the motor and the power supply; and the main controller comprises a drive control port connected with the drive circuit and a switch control port connected with the electric control switch circuit, and the main controller controls the electric control switch to be switched on through the switch control port and then controls the drive circuit to drive the motor through the drive control port.

Furthermore, the electric control switch circuit comprises a first triode, the first triode and the electric control switch are connected in series with the power circuit, the first triode is connected with the switch control port, and the main controller controls the first triode through the switch control port.

Furthermore, the driving circuit comprises a silicon controlled device connected in series with the electric control switch, the driving control port of the main controller is connected with the silicon controlled device, and the main controller controls the silicon controlled device through the driving control port.

Further, the driving circuit comprises a second triode, the second triode is connected with the silicon controlled rectifier and the power circuit, and the second triode is connected with the main controller.

Further, the drive circuit comprises a debounce capacitor connected between the drive control port and the power circuit, the debounce capacitor having a capacitance value in a range of 0.1nF to 10 nF. In some embodiments, effective debounce may be achieved.

Further, the driving circuit comprises a driving current limiting resistor connected between the thyristor device and the second triode, and the resistance value of the driving current limiting resistor ranges from 51 Ω to 100 Ω. In some embodiments, the thyristor device may be actively driven.

Furthermore, the driving circuit comprises an absorption circuit connected with the silicon controlled device in parallel, the absorption circuit comprises a first capacitor, a second capacitor and an absorption resistor, the first capacitor is connected with the silicon controlled device in parallel, and the second capacitor is connected with the absorption resistor in series and then connected with the first capacitor in parallel. In some embodiments, the absorption circuit may protect the thyristor device from false triggering.

Further, the capacitance value of the first capacitor ranges from 1nF to 100 nF. In some embodiments, the thyristor device is not damaged or misfired when there is a momentary pulse.

Further, the electrically controlled switch comprises a relay.

Another aspect of the present application provides a food processor, including: a main machine including a motor; a cup assembly which can be assembled to the main machine; and the motor control circuit is connected with the motor and controls the motor.

The electric control switch is arranged in a loop of the motor control circuit, which is connected with the motor and the power supply, the main controller controls the electric control switch to be switched on through the switch control port and controls the driving circuit to drive the motor through the drive control port, and in some embodiments, the motor can not act when the driving circuit is interfered and is triggered mistakenly in a standby state, so that the safety requirement is met, and the safety is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

Fig. 1 is a schematic view of an embodiment of a food processor of the present application;

FIG. 2 is a schematic block diagram illustrating one embodiment of a motor control circuit of the present application;

FIG. 3 is a partial circuit diagram of one embodiment of the motor control circuit shown in FIG. 2;

FIG. 4 is a flow chart illustrating one embodiment of a motor control method of the present application;

fig. 5 is a waveform diagram showing the voltage output from the power supply.

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 application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, 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 application. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this 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 at least two. 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. Numerical ranges are inclusive of the endpoints.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application 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.

The motor control circuit of this application embodiment for control cooking machine's motor. The motor control circuit comprises a power supply circuit, a driving circuit, an electric control switch circuit and a main controller. The power circuit is connected with a power supply. The driving circuit is connected with the motor and the power supply. The electric control switch circuit comprises an electric control switch connected with the power circuit, the electric control switch is connected in a loop formed by connecting the driving circuit, the motor and the power supply, and the loop formed by connecting the driving circuit, the motor and the power supply is switched on and off. The main controller comprises a drive control port connected with the drive circuit and a switch control port connected with the electric control switch circuit. After the main controller controls the electric control switch to be conducted through the switch control port, the driving circuit is controlled to drive the motor through the driving control port.

According to the motor control circuit, the electric control switch is arranged in a loop of the motor control circuit, the motor and the power supply, the main controller controls the electric control switch to be switched on through the switch control port and then controls the driving circuit to drive the motor through the drive control port, and in some embodiments, the motor can not act when the driving circuit is interfered and is triggered mistakenly in a standby state, so that the safety requirement is met, and the safety is improved.

Fig. 1 is a schematic diagram of an embodiment of a food processor 10. The food processor 10 includes a main body 11 and a cup assembly 12. 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. A motor (not shown) may be assembled in the main body 11.

The cup assembly 12 may be assembled to the main body 11. In one embodiment, the cup assembly 12 is removably assembled to the host 11. The cup assembly 12 may contain food material therein, and the food material may be whipped, heated and/or vacuumed, etc. within the cup assembly 12. A stirring blade assembly (not shown) can be assembled in the cup assembly 12, and the stirring blade assembly is connected with a motor, and the motor can drive the stirring blade assembly to rotate so as to stir the food material.

Fig. 2 is a block diagram of one embodiment of a motor control circuit 100. The food processor 10 includes a motor control circuit 100. The motor control circuit 100 is used for controlling the motor 13 of the food processor 10. The motor control circuit 100 is connected to the motor 13 and controls the motor 13. The motor control circuit 100 includes a power supply circuit 101, a drive circuit 102, an electrically controlled switch circuit 103, and a main controller 104. The power supply circuit 101 is connected to a power supply 200. The power supply 200 may be an ac power supply, such as a mains power supply. The power supply circuit 101 may convert ac power output from the power supply 200 into dc power, and may convert strong power into weak power. The power supply circuit 101 may include a switching power supply.

The drive circuit 102 connects the motor 13 and the power source 200. The drive circuit 102 may drive the motor 13. The drive circuit 102 and the motor 13 are connected in series to the power supply 200. The electric control switch circuit 103 is connected to a circuit connecting the drive circuit 102, the motor 13 and the power supply 200, and turns on/off the circuit connecting the drive circuit 102, the motor 13 and the power supply 200. The main controller 103 includes a drive control port train connected to the drive circuit 102, and a switch control port RLY connected to the electrically controlled switch circuit 103. The main controller 103 controls the electrically controlled switch circuit 103 through the switch control port RLY, and controls the drive circuit 102 to drive the motor 13 through the drive control port RLY. After the main controller 103 controls the electric control switch circuit 103 to be conducted, the driving circuit 102 is controlled to drive the motor 13.

The power supply circuit 101 is connected to the main controller 103 and supplies power to the main controller 103. The power circuit 101 is connected with the electric control switch circuit 103 and supplies power to the electric control switch circuit 103. The power supply circuit 101 is connected to the drive circuit 102, and is connected to the drive circuit 102.

In some embodiments, motor control circuit 100 includes a zero crossing detection circuit 105, and zero crossing detection circuit 105 is coupled to power supply 200 to detect zero crossing points of the alternating current. The main controller 104 is connected to the zero-crossing detection circuit 105, detects a zero-crossing signal generated by the zero-crossing detection circuit 105, and controls the driving circuit 102 according to the zero-crossing signal.

Fig. 3 is a partial circuit diagram of one embodiment of the motor control circuit 100. Referring to fig. 2 and 3, the electrically controlled switch circuit 103 includes an electrically controlled switch K1 connected to the power supply circuit 101, an electrically controlled switch K1 connected to a circuit connecting the driving circuit 102, the motor 13 and the power supply 200, and turning on and off the circuit connecting the driving circuit 102, the motor 13 and the power supply 200. The main controller 104 controls the electric control switch K1 to be turned on through the switch control port RLY, and then controls the driving circuit 102 to drive the motor 13 through the driving control port Traic. Therefore, the motor 13 can not be electrified to act when the driving circuit 102 is interfered and is triggered by mistake in a standby state, the safety requirement is met, and the safety is improved. In the standby state, the main controller 104 controls the electronically controlled switch K1 to remain open, thus keeping the motor and the driving circuit 102 powered off.

In some embodiments, the electronically controlled switch K1 comprises a relay, the switch of which is connected in series with the drive circuit 102 and the motor 13, the coil of which is connected to the power circuit 101. When the main controller 104 controls the coil of the relay to be communicated with the power circuit 101, the power supply of the power circuit 101 is received, and the switch is closed; when the coil of the control relay is powered off, the switch is switched off. The first power supply terminal VCC1 is shown connected to the power supply circuit 101. the power supply circuit 101 may provide a dc voltage via the first power supply terminal VCC 1. In one embodiment, the first power supply terminal VCC1 provides a negative voltage, such as a-12V voltage.

In some embodiments, the electronically controlled switch circuit 103 includes a first transistor Q1, the first transistor Q1 is connected in series with the electronically controlled switch K1 in the power circuit 101, the first transistor K1 is connected to the switch control port RLY, and the main controller 104 controls the first transistor Q1 through the switch control port RLY. The main controller 104 controls the on-off of the electric control switch K1 by controlling the on-off of the first triode Q1, thereby controlling the on-off of the loop where the driving circuit 102 and the motor 13 are located. The first transistor Q1 remains in communication with ground. In one embodiment, the first transistor Q1 is a PNP transistor, the base of the first transistor Q1 is connected to the switch control port RLY of the main controller 104, the collector is connected to the electronically controlled switch K1, and the emitter is grounded. The collector of the first transistor Q1 is connected to the coil of the relay, which is connected to a first power supply terminal VCC 1. In some embodiments, a current limiting resistor R6 is connected in series between the base of the first transistor Q1 and the switch control port RLY of the main controller 104 to limit the current. In some embodiments, the base of the first transistor Q1 is coupled to ground through a pull-down resistor R7. The voltage provided by the first power supply terminal VCC1 is a negative voltage, when the switch control port RLY outputs a low level, the first triode Q1 is turned on, and the electronic control switch K1 is closed; on the contrary, when the switch control port RLY outputs a high level, the first triode Q1 is cut off, and the electronic control switch K1 is turned off. In some embodiments, the electronically controlled switch K1 is connected in parallel with a freewheeling diode D1 for discharging the coil when the electronically controlled switch K1 is open.

In some embodiments, the driving circuit 102 includes a thyristor SCR1 connected in series to the electronically controlled switch K1, a driving control port Traic of the main controller 104 is connected to the thyristor SCR1, and the main controller 104 controls the thyristor SCR1 through the driving control port Traic. The main controller 104 controls the turn-on time of the thyristor SCR1 to control the speed of the motor 13. After the zero-crossing detection circuit 105 detects the zero-crossing point of the alternating current, the main controller 104 delays for a period of time to control the SCR1 to be conducted. The conduction time of the silicon controlled device SCR1 in one period of the alternating current is controlled to be different by controlling different delay time after the zero crossing point, so that the rotating speed of the motor 13 is controlled to be different.

In some embodiments, the driving circuit 102 includes a second transistor Q2, the second transistor Q2 is connected to the SCR1 and the power circuit 101, and the second transistor Q2 is connected to the main controller 104. The main controller 104 controls the thyristor device SCR1 by controlling the on/off of the second transistor Q2. In one embodiment, the second transistor Q2 is an NPN transistor, a base of the second transistor Q2 is connected to the driving control port Traic of the main controller 104, an emitter of the second transistor Q2 is connected to the second power source terminal VCC2, and is connected to the power circuit 101 through the second power source terminal VCC2, and a collector of the second transistor Q2 is connected to the SCR 1. The base of the second transistor Q2 is connected to a second power supply terminal VCC2 through a pull-down resistor R4. A current limiting resistor R5 is connected in series between the base of the second transistor Q2 and the driving control port Traic of the main controller 104. When the driving control port Traic outputs a high level, the second triode Q2 is conducted, the second triode Q2 is conducted for a period of time, the driving control port Traic outputs a low level, and the second triode Q2 is cut off. Thus, trigger pulses of the SCR1 are provided to control the SCR1 to be conducted until the zero crossing point of alternating current, and the SCR1 is automatically cut off when the zero crossing point is reached. After a period of time from the zero crossing point, the second triode Q2 is controlled to be conducted for a period of time so as to control the SCR1 to be conducted until the next zero crossing point.

In some embodiments, the driving circuit 102 includes a debounce capacitor C3 connected between the driving control port Traic and the power circuit 101, and the debounce capacitor C3 has a capacitance value ranging from 0.1nF to 10 nF. Because the waveform of the driving control port Trace is a pulse waveform with the frequency equal to the mains frequency (the mains cycle is 10ms), the capacitance range of the debounce capacitor C3 is 0.1nF to 10nF, so that the debounce can be effectively realized, and the waveform is more regular.

In some embodiments, the driving circuit 102 includes a driving current limiting resistor R3 connected between the SCR1 and the second transistor Q2, and the driving current limiting resistor R3 has a resistance value ranging from 51 Ω to 100 Ω. The trigger current of the SCR1 is 35mA, so the drive current is (5-0.8V)/R3, which needs to be more than 35 mA. The resistance range of the driving current limiting resistor R3 is 51 omega to 100 omega, so that the driving circuit is larger than 35mA, and the silicon controlled rectifier device SCR1 can be effectively driven.

In some embodiments, the driving circuit 102 includes a current limiting resistor R2 connected between the SCR1 and ground, and the current limiting resistor R2 is connected in series between the control terminal G of the SCR1 and ground to prevent the SCR from triggering erroneously.

In some embodiments, the driving circuit 102 includes a snubber circuit 121 connected in parallel to the thyristor SCR1, the snubber circuit 121 includes a first capacitor C1, a second capacitor C2, and a snubber resistor R1, the first capacitor C1 is connected in parallel to the thyristor SCR1, and the second capacitor C2 and the snubber resistor R1 are connected in series and then connected in parallel to the first capacitor C1. The absorption loop 121 is used to protect the thyristor SCR1 from being triggered by mistake. The snubber circuit 121 is connected in parallel to the first pole T1 and the second pole T2 of the thyristor SCR 1.

In some embodiments, the capacitance of the first capacitor C1 ranges from 1nF to 100nF, so that the SCR1 is not damaged or misfired when there is a momentary pulse. In some embodiments, the first capacitor C1 is a high voltage ceramic tile capacitor.

FIG. 4 is a flow chart illustrating one embodiment of a motor control method 300. The motor control method 300 is used to control a motor and regulate the rotational speed of the motor. The motor control method 300 comprises steps 301-304. In step 301, the electronic control switch is controlled to be closed, so that the loops of the motor, the driving circuit and the power supply are communicated. The electric control switch is a switch of a mechanical mechanism, and a certain time is required for attracting.

In step 302, the driving circuit is controlled to drive the motor to increase the voltage of the motor from the first voltage Vmin to the second voltage Vmax after delaying for a first time period. The first time period may range from 50ms to 500ms, for example 200 ms. After the electric control switch is closed, the first time period is delayed to control the driving circuit to start working, so that the driving circuit is ensured to act after the electric control switch is closed, no voltage is generated when the contact of the electric control switch is attracted, and the service life of the electric control switch is prolonged. The voltage of the motor is increased from the first voltage Vmin to the second voltage Vmax, and the voltage is gradually increased, so that the motor can be smoothly started, the speed is gradually changed, and sudden change is avoided. In one embodiment, the voltage may be increased from the first voltage Vmin to one or more voltages between the first voltage Vmin and the second voltage Vmax and then to the second voltage Vmax, thereby gradually increasing the voltage and gradually increasing the speed of the motor.

In step 303, the drive circuit is controlled to maintain the voltage of the motor at the second voltage for a second period of time to ensure that the motor has started. The second period of time may range from 0.5s to 3s, for example 2 s.

In step 304, the driving circuit is controlled to adjust the voltage of the motor to the third voltage Vnormal. The third voltage Vnormal is lower than the second voltage Vmax and greater than the first voltage Vmin, and is a motor voltage corresponding to a gear set by a user, so that the rotating speed of the motor reaches the rotating speed corresponding to the gear selected by the user, and the motor is kept to operate at a low speed. So, can be when the user selects to carry out low-speed stirring function, under the motor low-speed start running state, can rise the voltage of motor to higher voltage, make the motor reach a higher rotational speed earlier, can with the big piece hard edible material precomminution, perhaps ensure after the motor has started, reduce the voltage of motor again, make the motor low-speed operation, reach the low-speed stirring function that the user selected to solve the problem of motor stall under the low-speed running state. In one embodiment, the voltage of the motor may be reduced to one or more voltages between the second voltage Vmax and the third voltage Vnormal before the third voltage Vnormal.

Fig. 5 is a waveform diagram of an ac voltage output from the power supply. The period corresponding to the hatched portion in the figure is a period in which the drive circuit is on. The longer the period of time that the drive circuit is on in one cycle, the higher the voltage of the motor and the higher the rotation speed of the motor. As can be seen from the figure, the time period of the conduction of the driving circuit is gradually lengthened and then gradually shortened, which means that the voltage of the motor is gradually increased and then gradually decreased, and the rotating speed of the motor is gradually increased and then gradually decreased to reach the rotating speed corresponding to the low-speed stirring function selected by the user.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (10)

1. The utility model provides a motor control circuit for control cooking machine's motor (13), its characterized in that includes:

a power supply circuit (101) connected to a power supply;

a drive circuit (102) connecting the motor (13) and the power supply;

the electric control switch circuit (103) comprises an electric control switch connected with the power circuit (101), and the electric control switch is connected to a loop connected with the drive circuit (102), the motor (13) and the power supply and is used for switching on and off the loop connected with the drive circuit (102), the motor (13) and the power supply; and

the main controller (104) comprises a drive control port connected with the drive circuit (102) and a switch control port connected with the electric control switch circuit (103), and after the main controller (104) controls the electric control switch to be conducted through the switch control port, the drive circuit (102) is controlled to drive the motor (13) through the drive control port.

2. The motor control circuit of claim 1, wherein the electronically controlled switching circuit (103) comprises a first transistor, the first transistor and the electronically controlled switch are connected in series to the power circuit (101), the first transistor is connected to the switch control port, and the main controller (104) controls the first transistor through the switch control port.

3. The motor control circuit of claim 1, wherein the drive circuit (102) comprises a thyristor device connected in series to the electrically controlled switch, the drive control port of the master controller (104) being connected to the thyristor device, the master controller (104) controlling the thyristor device through the drive control port.

4. The motor control circuit of claim 3, wherein the drive circuit (102) comprises a second transistor, the second transistor connecting the thyristor device and the power circuit (101), the second transistor connecting the main controller (104).

5. The motor control circuit according to claim 4, characterized in that the drive circuit (102) comprises a debounce capacitor connected between the drive control port and the power supply circuit (101), the debounce capacitor having a capacitance value in the range of 0.1nF to 10 nF.

6. The motor control circuit of claim 4, wherein the driver circuit (102) comprises a drive current limiting resistor coupled between the thyristor and the second transistor, the drive current limiting resistor having a resistance in a range of 51 Ω to 100 Ω.

7. The motor control circuit of claim 3, wherein the drive circuit (102) comprises an absorption circuit (121) connected in parallel with the thyristor, and wherein the absorption circuit (121) comprises a first capacitor, a second capacitor and an absorption resistor, the first capacitor is connected in parallel with the thyristor, and the second capacitor is connected in series with the absorption resistor and then connected in parallel with the first capacitor.

8. The motor control circuit of claim 7 wherein the first capacitor has a capacitance value in the range of 1nF to 100 nF.

9. The motor control circuit of claim 1 wherein said electrically controlled switch comprises a relay.

10. A food processor, comprising:

a main machine (11) including a motor (13);

a cup assembly (12) assemblable to the main body (11); and

a motor control circuit according to any of claims 1-9, connected to the motor (13) for controlling the motor (13).

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