CN211630111U

CN211630111U - Food processing machine with multiple semiconductor switches and motor

Info

Publication number: CN211630111U
Application number: CN202020198376.9U
Authority: CN
Inventors: 王旭宁; 林小财; 杜春年
Original assignee: Joyoung Co Ltd
Current assignee: Joyoung Co Ltd
Priority date: 2020-02-24
Filing date: 2020-02-24
Publication date: 2020-10-02
Anticipated expiration: 2030-02-24

Abstract

The utility model discloses a food processor with a plurality of semiconductor switches and a motor, which is applied to a portable food processor and comprises a motor and a power circuit, wherein the power circuit is used for supplying power to the motor; the food processor also comprises at least two semiconductor switch assemblies, each semiconductor switch assembly comprises a semiconductor switch, and all the semiconductor switches are connected in series in a power supply loop of the motor; the food processor also comprises a main control chip for controlling the on-off of each semiconductor switch, and the control end of each semiconductor switch component is respectively electrically communicated with one control pin of the main control chip; when all the semiconductor switches are turned on, the motor is turned on. The utility model discloses a food preparation machine of motor is opened to many semiconductor switch, a plurality of semiconductor switch subassemblies switch on the motor simultaneously and just can work, the risk of motor work when can avoiding single control switch inefficacy.

Description

Food processing machine with multiple semiconductor switches and motor

Technical Field

The utility model relates to a kitchen appliances field, more specifically relates to a food preparation machine that motor was switched on to many semiconductor switch.

Background

Currently, most of portable food processors (such as carry-on juicers) in the small household appliance market use a single metal-oxide-semiconductor field effect transistor (MOS transistor) as a switch for driving a motor to work.

Because the traditional portable food processor has only one MOS tube for driving the motor to work, if the MOS tube is damaged and fails to be directly connected, a power supply is directly connected with the motor, and the blade is driven by the motor to rotate, so that serious safety risk exists.

SUMMERY OF THE UTILITY MODEL

The application provides a food processor with a motor switched on by a plurality of semiconductor switches, which is applied to a portable food processor and comprises the motor and a power circuit, wherein the power circuit is used for supplying power to the motor;

the food processor also comprises at least two semiconductor switch assemblies, each semiconductor switch assembly comprises a semiconductor switch, and all the semiconductor switches are connected in series in a motor power supply loop;

the food processor also comprises a main control chip for controlling the on-off of each semiconductor switch, and the control end of each semiconductor switch component is respectively electrically communicated with one control pin of the main control chip;

when all the semiconductor switches are turned on, the motor is turned on.

Optionally, the semiconductor switch is an MOS transistor, and a negative electrode of the power circuit is communicated with a ground terminal;

when the semiconductor switch is an N-channel MOS tube, the N-channel MOS tube is connected between the negative electrode of the motor and the grounding end in series;

or when the semiconductor switch is a P-channel MOS tube, the P-channel MOS tube is connected between the positive electrode of the power circuit and the positive electrode of the motor in series.

Optionally, the semiconductor switch subassembly is two, and the semiconductor switch in two semiconductor switch subassemblies is the N channel MOS pipe, is first MOS pipe and second MOS pipe respectively, concatenates between motor negative pole and earthing terminal behind first MOS pipe and the second MOS pipe intercommunication, wherein:

the source electrode of the first MOS tube is communicated with the drain electrode of the second MOS tube, the drain electrode of the first MOS tube is communicated with the negative electrode of the motor, and the source electrode of the second MOS tube is communicated with the grounding end; the grid of the first MOS tube is communicated with the first control pin of the main control chip, and the grid of the second MOS tube is communicated with the second control pin of the main control chip.

Optionally, the semiconductor switch components are two, the semiconductor switch in one of the semiconductor switch components is a P-channel MOS transistor, the semiconductor switch in the other semiconductor switch component is an N-channel MOS transistor, the P-channel MOS transistor is connected in series between the positive pole of the power circuit and the positive pole of the motor, and the N-channel MOS transistor is connected in series between the negative pole of the motor and the ground terminal, wherein:

the drain electrode of the P-channel MOS tube is communicated with the anode of the power circuit, the source electrode of the P-channel MOS tube is communicated with the anode of the motor, and the grid electrode of the P-channel MOS tube is communicated with the third control pin of the main control chip; and the drain electrode of the N-channel MOS tube is communicated with the negative electrode of the motor, the source electrode of the N-channel MOS tube is communicated with the grounding end, and the grid electrode of the N-channel MOS tube is communicated with the fourth control pin of the main control chip.

Optionally, the food processor further comprises a sampling resistor for detecting a current of a motor power supply loop, and the sampling resistor is connected in series in the motor power supply loop; one end of the sampling resistor, which is far away from the grounding end, is communicated with the sampling pin of the main control chip, at least one semiconductor switch is disconnected, and when the sampling resistor has a voltage drop, the main control chip judges that the disconnected semiconductor switch is invalid.

Optionally, when at least one semiconductor switch is an N-channel MOS transistor, the sampling resistor is connected in series between the source of the bottom N-channel MOS transistor and the ground terminal, and the bottom N-channel MOS transistor is an N-channel MOS transistor close to the ground terminal.

Optionally, the food processor further comprises: the N communication drive circuit is used for controlling the on-off of an N-channel MOS tube, and is connected in series between a control pin of the main control chip and a grid electrode of the N-channel MOS tube, wherein:

the N communication drive circuit comprises: the first resistor, the second resistor and the first capacitor are connected in parallel, the first end of the second resistor and the first capacitor after being connected in parallel is respectively communicated with the first end of the first resistor and the grid electrode of one N-channel MOS tube, the second end of the second resistor after being connected in parallel is communicated with the grounding end or the source electrode of one N-channel MOS tube, and the second end of the first resistor is communicated with one control pin of the main control chip.

Optionally, the food processor further comprises: the P communication drive circuit is used for controlling the on-off of a P channel MOS tube, and is connected in series between a control pin of the main control chip and a grid electrode of the P channel MOS tube, wherein:

the P communication driving circuit comprises: the first end of the third resistor is communicated with the base electrode of the triode respectively, the second end of the third resistor is communicated with the collector electrode of the triode, and the second end of the third resistor is communicated with one control pin of the main control chip;

the emitting electrode of the triode is communicated with the grid electrode of a P-channel MOS tube, and the collecting electrode of the triode is communicated with the grounding end or the source electrode of the P-channel MOS tube.

Optionally, the food processor further comprises: and the anode of the diode is communicated with the cathode of the motor, and the cathode of the diode is communicated with the anode of the motor.

Optionally, the power circuit comprises a battery assembly, the battery assembly providing a power source;

alternatively, the power circuit comprises a battery assembly and a charging port, and one of the battery assembly and the charging port provides power.

Compared with the prior art, the food processor with the motor switched on by the multiple semiconductor switches has the following beneficial effects: the food processor can comprise a plurality of semiconductor switch assemblies for controlling the on or off of the motor, the semiconductor switches are all connected in series in a power supply loop of the motor, only when all the semiconductor switch assemblies are simultaneously switched on, the motor can work, the working safety of the system is improved, and the risk of the motor working when the single control switch fails can be avoided.

In some embodiments of the present application, the multiple semiconductor switches turn on the motor, and the following effects can also be achieved:

1. the N-channel MOS tubes are respectively connected between the negative electrode of the motor and the grounding end in series, so that the N-channel MOS tubes can control the motor to be switched on or switched off at the same time.

2. The plurality of P-channel MOS tubes are respectively connected between the positive electrode of the power circuit and the positive electrode of the motor in series, so that the plurality of P-channel MOS tubes can control the motor to be switched on or switched off at the same time.

3. Compared with a single MOS tube control circuit, the motor can be connected in series in a motor loop through two N-channel MOS tubes, and only when the two N-channel MOS tubes are simultaneously conducted, the motor can work after starting.

4. Compared with a single MOS (metal oxide semiconductor) tube control circuit, the motor can be connected in series in a motor loop in a PMOS + NMOS tube combination mode, and only when the PMOS tube and the NMOS tube are simultaneously conducted, the motor can work after starting.

In some embodiments of the present application, the following effects can also be achieved:

1. can set up sampling resistor in motor power supply circuit, through the disconnection of single MOS pipe of main control chip control to and whether produce the pressure drop on detecting sampling resistor, realize the detection of failure of single MOS pipe, even there is the risk of single MOS pipe failure, also can control the shutoff of all the other MOS pipes through detecting MOS pipe failure, prevent that single MOS pipe from failing and have blade pivoted wounded's risk.

2. The two ends of the motor can be connected with a diode, and the energy of the reverse induced electromotive force generated by the motor at the moment of power supply disconnection is released through the diode, so that the follow current effect is achieved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.

Fig. 1 is a schematic structural diagram of a multiple semiconductor switch-on motor according to a first embodiment of the present invention;

fig. 2 is a schematic diagram of a motor control of a dual MOS transistor according to a first embodiment of the present invention;

fig. 3 is a flow chart of the single MOS tube failure detection of the food processor with the multiple semiconductor switches turning on the motor according to the embodiment of the present invention;

fig. 4 is a schematic diagram of a motor control of a dual MOS transistor according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The scheme provides a driving scheme of multiple MOS tubes, the multiple MOS tubes are connected in series in a motor loop, the motor can normally operate only by simultaneously connecting the multiple MOS tubes, and the risk of motor working when a single MOS tube fails can be avoided. Meanwhile, the failure detection of a single MOS tube can be realized, if the MOS tube is detected to be damaged, the MOS tube which can still normally work is immediately closed to stop the whole machine, and the working safety of the portable food processor is greatly improved.

Example one

The embodiment of the utility model provides a food preparation machine of motor is switched on to many semiconductor switch can be applied to portable food preparation machine. The food processor provided by this embodiment may include a motor and a power circuit that may be used to power the motor. Fig. 1 is a schematic structural diagram of a multiple semiconductor switch-on motor according to an embodiment of the present invention, as shown in fig. 1, the food processor provided in this embodiment may further include at least two semiconductor switch assemblies, each semiconductor switch assembly includes a semiconductor switch, and all the semiconductor switches are connected in series in a power supply circuit of the motor. When all the semiconductor switches are turned on, the motor is turned on.

In this embodiment, the food processor may include a plurality of semiconductor switch assemblies for controlling the motor Mot1 to be turned on or off. Specifically, as shown in fig. 1, the first semiconductor switch component, the ith semiconductor switch component, the jth semiconductor switch component and the nth semiconductor switch component are all connected in series in the power supply circuit of the motor respectively, the N semiconductor switch components are connected in series in the circuit of the motor as switches for controlling the motor to work and turn off, and the motor can work only when the N semiconductor switch components are simultaneously turned on, so that the risk of the motor working when a single control switch fails can be avoided. Wherein, i is 1,2 … … N, j is 1,2 … … N, N is not less than 2.

In this embodiment, the main control chip of the food processor can control the on/off of all the semiconductor switches. Specifically, the food processor provided by this embodiment may further include a main control chip for controlling on/off of each semiconductor switch, and the control terminal of each semiconductor switch assembly is electrically connected to one control pin of the main control chip.

In this embodiment, different control pins of the main control chip are respectively communicated with the control ends of different semiconductor switch assemblies, so that the plurality of semiconductor switch assemblies can be simultaneously controlled to be switched on or switched off through the plurality of different control pins. For example, the control switching circuit of the motor includes three semiconductor switching elements: the first control pin of the main control chip is communicated with the control end of the first semiconductor switch component so as to control the connection or disconnection of the first semiconductor switch component; a second control pin of the main control chip is communicated with a control end of the second semiconductor switch assembly so as to control the conduction or the disconnection of the second semiconductor switch assembly; and a third control pin of the main control chip is communicated with the control end of the third semiconductor switch component so as to control the connection or disconnection of the third semiconductor switch component.

Specifically, when the motor is controlled to work or stop working, the main control chip can control a plurality of different control pins to simultaneously output driving signals for switching on or off the semiconductor switch assemblies, so as to simultaneously control the switching on or off of the plurality of semiconductor switch assemblies. For example, in the case that the control switch circuit of the motor includes three semiconductor switch assemblies, if the main control chip controls the first control pin, the second control pin and the third control pin to output the driving signal for conduction, the first semiconductor switch assembly, the second semiconductor switch assembly and the third semiconductor switch assembly are conducted simultaneously.

The main control chip may control the semiconductor switch assembly to be turned on or off through the control pin according to the prior art, for example, a level signal (high level or low level) may be output through the control pin of the main control chip to control the semiconductor switch assembly to be turned on or off, which is not limited and described herein.

The embodiment of the utility model provides a food preparation machine of motor is opened to many semiconductor switch can include a plurality of semiconductor switch subassemblies for opening or turn-off of control motor, a plurality of semiconductor switch all concatenate in motor power supply loop, only switch on simultaneously when all semiconductor switch subassemblies, and the motor just can work, and the risk of motor work when single control switch inefficacy can be avoided to the work security of lift system.

Further, in the above embodiments, the semiconductor switch is a metal-oxide-semiconductor field effect transistor (MOS transistor), and the negative electrode of the power circuit is connected to the ground terminal. Wherein, a plurality of MOS pipes are established ties and can include in the motor supply circuit: when the semiconductor switch is an N-channel MOS tube (NMOS tube for short), the N-channel MOS tube is connected between the negative electrode of the motor and the grounding end in series.

In this embodiment, the semiconductor switch for controlling the turning on or off of the motor may be an N-channel MOS transistor, and the N-channel MOS transistors are respectively connected in series between the negative electrode of the motor and the ground terminal, so that the N-channel MOS transistors simultaneously control the turning on or off of the motor.

Specifically, when the N-channel MOS transistor is plural, the connection of the plural N-channel MOS transistors between the negative electrode of the motor and the ground terminal in series respectively may include: the source S and the drain D of every two N-channel MOS tubes are communicated, and the grid G of each N-channel MOS tube is communicated with one control pin of the main control chip.

For example, in this embodiment, the semiconductor switch device may be two N-channel MOS transistors, and the remaining number is the same as the implementation principle of the two N-channel MOS transistors, which is not described in detail in this embodiment.

Specifically, fig. 2 is the embodiment of the utility model provides a motor control schematic diagram of two MOS tubes that provides, as shown in fig. 2, semiconductor switch subassembly can be two, and semiconductor switch among two semiconductor switch subassemblies is the N channel MOS pipe, is first MOS pipe Q1 and second MOS pipe Q2 respectively, concatenates between motor negative pole and earthing terminal GND after first MOS pipe and the second MOS pipe intercommunication. Wherein:

the source S of the first MOS tube Q1 is communicated with the drain D of the second MOS tube Q2, the drain D of the first MOS tube Q1 is communicated with the negative electrode of the motor Mot1, and the source S of the second MOS tube Q2 is communicated with the ground terminal; the grid G of the first MOS tube is communicated with a first control pin of the main control chip, and the grid of the second MOS tube Q2 is communicated with a second control pin of the main control chip.

In this embodiment, N-channel MOS transistors Q1 and Q2 are connected in series in the motor circuit as a switch for controlling the operation and turn-off of the motor. Specifically, as shown in fig. 1, the positive electrode of the Motor is connected to the positive electrode B + of the battery, the negative electrode of the Motor is connected to the drain of the Q1, the drain of the Q2 is connected to the source of the Q1, the first control pin of the main control chip outputs driving signals Motor _ a to the gate of the Q1, and the second control pin of the main control chip outputs driving signals Motor _ B to the gate of the Q2.

When the driving signal Motor _ a is at a high level, the drain and the source of the Q1 are turned on; when the driving signal Motor _ a is low, the drain and source of Q1 are disconnected.

When the driving signal Motor _ B is at a high level, the drain and source of Q2 are turned on; when the driving signal Motor _ B is low, the drain and source of Q2 are disconnected.

The embodiment of the utility model provides a food preparation machine of motor is opened to many semiconductor switch compares in single MOS pipe control circuit, and this embodiment establishes ties in the motor return circuit through two N channel MOS pipes, only switches on simultaneously when two N channel MOS pipes, and the motor just can work after the start-up.

Further, in the above embodiment, the food processor may further include a sampling resistor for detecting a current of the motor power supply loop, and the sampling resistor is connected in series in the motor power supply loop; one end of the sampling resistor, which is far away from the grounding end, is communicated with the sampling pin of the main control chip, and when at least one semiconductor switch is disconnected and voltage drop exists on the sampling resistor, the main control chip judges that the disconnected semiconductor switch is invalid.

In this embodiment, a sampling resistor (e.g., R6 in fig. 2) may be disposed in the motor power supply circuit, and the sampling resistor is used to detect the motor circuit current, so as to be used as a criterion for detecting whether the MOS transistor fails.

Optionally, when the at least one semiconductor switch is an N-channel MOS transistor, the sampling resistor is connected in series between the source of the bottom N-channel MOS transistor and the ground terminal, and the bottom N-channel MOS transistor is an N-channel MOS transistor close to the ground terminal. As shown in fig. 2, the bottom N-channel MOS transistor may be Q2, the source of Q2 is connected to one end of a resistor R6, and the other end of the resistor R6 is grounded.

Specifically, when all MOS transistors are turned on, the motor operating current will generate a voltage drop on the sampling resistor (e.g., R6 in fig. 2), and the voltage drop is proportional to the current, i.e., there is a current in the circuit. When only one MOS tube is disconnected, the working current of the motor does not generate voltage drop on a sampling resistor (such as R6 in FIG. 2), namely, no current flows in the circuit. The voltage drop signal generated on the sampling resistor can be transmitted to the sampling pin of the main control chip through the current limiting resistor R5, one end of the capacitor C3 is connected with the resistor R5, and the other end of the capacitor C3 is connected to the ground.

The disconnection of single MOS pipe of this embodiment accessible main control chip control to and whether produce the pressure drop on detecting the sampling resistor through sampling signal AD _ motor, realize the failure detection of single MOS pipe, with the operating condition who detects the MOS pipe, get rid of the work hidden danger. Specifically, when at least one MOS tube is disconnected and a voltage drop exists on the sampling resistor, the main control chip judges that the disconnected semiconductor switch is invalid. In this embodiment, if it damages to detect there is the MOS pipe, then close the MOS pipe that still can normally work immediately and make the complete machine stop work, promptly, in many MOS pipe control circuit, even there is the risk of single MOS pipe inefficacy, also can control the shutoff of remaining MOS pipe through detecting the MOS pipe inefficacy, prevent that single MOS pipe inefficacy and have blade pivoted wounded's risk.

The main control chip judges that the disconnected semiconductor switch is invalid when at least one semiconductor switch is disconnected and voltage drop exists on the sampling resistor, and adopts a judgment algorithm in the prior art, for example, a preset judgment value (such as high level) can be set, a detection value of a control pin or an adopted pin is compared with the preset judgment value, and when the detection value of the control pin meets a condition (such as the detection value is high level), the main control chip judges that the semiconductor switch connected with the control pin is disconnected; when the detection value of the sampling pin meets the condition, the main control chip judges that the sampling resistor has voltage drop. Therefore, when the main control chip of the embodiment determines that the disconnected semiconductor switch is failed when at least one semiconductor switch is disconnected and a voltage drop exists on the sampling resistor, only the preset value set in the existing determination algorithm needs to be changed, and the algorithm does not need to be improved.

Specifically, fig. 3 is based on the utility model provides a food preparation machine that many semiconductor switches opened motor is to single MOS pipe failure detection's flowchart, as shown in fig. 3, based on the motor control schematic diagram of the two MOS pipes that fig. 2 is shown, specifically can include single MOS pipe failure detection:

s301: a double click is initiated.

S302: the main control chip drives the Q1 to be turned off, and the Q2 to be turned on.

S303: the main control chip detects whether current exists. If yes, go to S304; otherwise, S305 is executed.

S304: q1 and Q2 were turned off.

In this embodiment, after the double-click start, the first control pin of the main control chip outputs the driving signal Motor _ a at a low level, and the second control pin of the main control chip outputs the driving signal Motor _ B at a high level, at this time, Q1 is in an off state, Q2 is in an on state, and if a current is detected in the loop, it indicates that Q1 has failed. And then, the first control pin and the second control pin of the main control chip respectively output driving signals Motor _ A and Motor _ B to be low level, Q2 is turned off, and a current loop is closed.

S305: the main control chip drives the Q1 to be turned on, and the Q2 is turned off.

In this embodiment, when Q1 is turned off and Q2 is turned on, if no current is detected in the loop, it is indicated that Q1 is normal, and then Q2 is detected. When detecting the Q2, the first control pin of the main control chip outputs the driving signal Motor _ a at a high level, and the second control pin of the main control chip outputs the driving signal Motor _ B at a low level, at this time, the Q1 is turned on, and the Q2 is turned off.

S306: the main control chip detects whether current exists. If yes, go to S304; otherwise, S307 is executed.

In this embodiment, when the Q1 is turned on and the Q2 is turned off, if a current is detected in the loop, it indicates that the Q2 has failed, and then the first control pin and the second control pin of the main control chip respectively output the driving signals Motor _ a and Motor _ B at low level, the Q1 is turned off, and the current loop is turned off.

S307: the main control chip drives the Q1 and the Q2 to be conducted.

In this embodiment, when Q1 is turned on and Q2 is turned off, if there is no current in the detection loop, it indicates that Q2 is normal, and the single MOS transistor failure detection is ended. And only when both Q1 and Q2 detect normal, the two MOS tube conducting motors are driven to work.

The embodiment of the utility model provides a food preparation machine of motor is opened to many semiconductor switch can set up sampling resistor in motor power supply loop, through the disconnection of single MOS pipe of main control chip control to and whether produce the pressure drop on the detection sampling resistor, realize the inefficacy detection of single MOS pipe, even there is the risk that single MOS pipe became invalid, also can control the turn-off of all the other MOS pipes through detecting MOS pipe inefficacy, prevent that single MOS pipe from becoming invalid and have blade pivoted and hinder people's risk.

Further, in the above embodiment, the food processor may further include: an N communication drive circuit for controlling the on-off of an N-channel MOS tube, wherein the N communication drive circuit is connected in series between a control pin of a main control chip and a grid electrode of the N-channel MOS tube, and the N communication drive circuit comprises:

the N communication driving circuit may include: the circuit comprises a first resistor (R1 or R3 in figure 2), a second resistor (R2 or R4 in figure 2) and a first capacitor (C1 or C2 in figure 2), wherein the second resistor and the first capacitor are connected in parallel, a first end of the second resistor and a first end of the first capacitor are respectively communicated with a gate of an N-channel MOS (metal oxide semiconductor) transistor after being connected in parallel, a second end of the second resistor and a ground end or a source of the N-channel MOS transistor after being connected in parallel are communicated, and a second end of the first resistor is communicated with a control pin of a main control chip.

In this embodiment, as shown in fig. 2, the driving signal Motor _ a is connected to the gate of Q1 through a resistor R1, a capacitor C1 is connected in parallel with the resistor R2, one end of the parallel connection of C1 and R2 is connected to the gate of Q1, and the other end of the parallel connection of C1 and R2 is connected to the source of Q1. The driving signal Motor _ B is connected to the grid of the Q2 through a resistor R3, a capacitor C2 is connected with the resistor R4 in parallel, one end of the C2 and the R4 which are connected in parallel is connected to the grid of the Q2, and the other ends of the C2 and the R4 are connected to the ground.

When the driving signal Motor _ a is at a high level, the signal is divided by the resistors R1 and R2 to drive the drain and the source of the MOS transistor Q1 to be turned on, and the capacitor C1 performs a filtering function. When the driving signal Motor _ a is at a low level, the drain and the source of the MOS transistor Q1 are disconnected.

When the driving signal Motor _ B is at a high level, the signal is divided by the resistors R3 and R4 to drive the drain and the source of the Q2 to be turned on, and the capacitor C2 plays a role in filtering. When the driving signal Motor _ B is at a low level, the drain and the source of the MOS transistor Q2 are disconnected.

Further, in the above embodiment, the food processor may further include: and the diode is used for eliminating the reverse induced electromotive force of the motor, the anode of the diode is communicated with the cathode of the motor, and the cathode of the diode is communicated with the anode of the motor.

Specifically, as shown in fig. 2, the cathode of the diode D1 is connected to the anode of the motor, and the anode of the diode D1 is connected to the cathode of the motor Mot1, and since the motor is an inductive load and reverse induced electromotive force is generated at the moment of power supply disconnection, the present embodiment can release the energy of the reverse induced electromotive force of the motor through the diode D1, thereby playing a role of freewheeling.

Further, in the above embodiments, the power circuit may include a battery assembly that provides a power source. In the embodiment, the power supply is provided by adopting a battery mode, so that the food processor is convenient to use, and the problem of power supply when the food processor is used in a portable mode is solved.

Further, in the above embodiment, the power circuit may include a battery assembly and a charging port, one of the battery assembly and the charging port providing power. In the embodiment, the power supply is provided by adopting a battery and charging port mode, the use is convenient, the power supply problem when the food processor is used in a portable mode is solved, the power supply mode is various, and the use scene of the portable food processor is expanded.

Example two

The present embodiment provides a food processor with a multi-semiconductor switch-on motor, which is different from the first embodiment mainly in the type of MOS transistor of the semiconductor switch.

In this embodiment, the semiconductor switch may include a P-channel MOS transistor, and the series connection of the MOS transistors in the motor power supply circuit may include: when the semiconductor switch is a P-channel MOS tube, the P-channel MOS tube is connected between the positive electrode of the power circuit and the positive electrode of the motor in series.

In this embodiment, the semiconductor switch for controlling the turning on or off of the motor may be a P-channel MOS transistor (for short, a PMOS transistor), and the P-channel MOS transistors are respectively connected in series between the positive electrode of the power circuit and the positive electrode of the motor, so that the P-channel MOS transistors simultaneously control the turning on or off of the motor.

Specifically, when the P-channel MOS transistor is plural, the P-channel MOS transistor is respectively connected in series between the positive electrode of the power circuit and the positive electrode of the motor, and may include: the source S and the drain D of every two P-channel MOS tubes are communicated, and the grid G of each P-channel MOS tube is communicated with one control pin of the main control chip.

Further, in the above embodiment, the number of the semiconductor switch assemblies may be two, where the semiconductor switch in one semiconductor switch assembly is a P-channel MOS transistor, the semiconductor switch in the other semiconductor switch assembly is an N-channel MOS transistor, the P-channel MOS transistor is connected in series between the positive electrode of the power circuit and the positive electrode of the motor, and the N-channel MOS transistor is connected in series between the negative electrode of the motor and the ground terminal.

In this embodiment, a PMOS + NMOS transistor combination mode may be adopted to be connected in series to the motor loop to control the on or off of the motor at the same time. Specifically, fig. 4 is a schematic diagram of the motor control of the dual MOS transistors provided in the embodiment of the present invention, as shown in fig. 4, the drain D of the P-channel MOS transistor Q4 is communicated with the positive electrode B + of the power circuit, the source S of the P-channel MOS transistor Q4 is communicated with the positive electrode of the motor, and the gate G of the P-channel MOS transistor Q4 is communicated with the third control pin of the main control chip; the drain D of the N-channel MOS tube Q3 is communicated with the negative electrode of the motor, the source of the N-channel MOS tube Q3 is communicated with the grounding end, and the grid of the N-channel MOS tube Q3 is communicated with the fourth control pin of the main control chip.

In this embodiment, a scheme in which PMOS + NMOS transistors are connected in series in the motor circuit may be adopted instead of the double NMOS transistor scheme of the embodiment. Specifically, as shown in fig. 4, a P-channel MOS transistor Q4 and an N-channel MOS transistor Q3 are connected in series in the motor circuit to serve as switches for controlling the operation and turn-off of the motor.

The control principle of the P-channel MOS transistor Q4 is as follows: a third control pin of the main control chip outputs driving signals Motor _ P to a grid electrode of Q4, and when the driving signal Motor _ P is in a high level, a drain electrode and a source electrode of Q4 are conducted; when the driving signal Motor _ P is low, the drain and source of Q4 are disconnected.

The implementation principle of turning on or off the N-channel MOS transistor Q3 can refer to turning on or off the N-channel MOS transistor in the first embodiment, which is not described in detail in this embodiment.

The embodiment of the utility model provides a food preparation machine of motor is opened to many semiconductor switch compares in single MOS pipe control circuit, and the mode series connection that this embodiment combines through PMOS + NMOS pipe is in the motor return circuit, only switches on simultaneously when two MOS pipes, and the motor just can work after the start-up.

Further, in the above embodiment, the food processor may further include: the P communication drive circuit is used for controlling the on-off of the P channel MOS tube, and is connected in series between a control pin of the main control chip and a grid electrode of the P channel MOS tube, wherein:

the P communication driving circuit may include: a third resistor (R9 in fig. 4), a fourth resistor (R10 in fig. 4), a second capacitor (C5 in fig. 4) and a transistor (T in fig. 4), wherein the fourth resistor and the second capacitor are connected in parallel, a first end of the parallel connection is respectively communicated with a first end of the third resistor and a base of the transistor, a second end of the parallel connection is communicated with a collector of the transistor, and a second end of the third resistor is communicated with a control pin of the main control chip;

In this embodiment, as shown in fig. 4, the driving signal Motor _ P is connected to the gate of the MOS transistor Q4 through the resistor R2 and the transistor T, the capacitor C5 is connected in parallel with the resistor R10, one end of the parallel connection of the capacitor C5 and the resistor R10 is connected to the base of the transistor T, the other end of the parallel connection of the capacitor C5 and the resistor R10 is connected to the collector of the transistor T, and the collector of the transistor T is grounded. When the driving signal Motor _ P is at a high level, the signal is divided by the resistors R9 and R10 to drive the emitter and collector of the transistor T to be conducted, and further drive the drain and source of the MOS transistor Q4 to be conducted, and the capacitor C5 plays a role in filtering. When the driving signal Motor _ P is at a low level, the emitter and the collector of the transistor T are disconnected, and the drain and the source of the MOS transistor Q4 are disconnected.

Specifically, the control principle of the P-channel MOS transistor Q4 is as follows: a third control pin of the main control chip outputs a driving signal Motor _ P to a grid electrode of the Q4, when the driving signal Motor _ P is in a high level, the triode T is conducted, and a drain electrode and a source electrode of the Q4 are conducted; when the driving signal Motor _ P is at a low level, the transistor T is turned off, and the drain and the source of the Q4 are turned off.

In this embodiment, when there is one P-channel MOS transistor connected in series between the positive electrode of the power circuit and the positive electrode of the motor, the P-channel MOS transistor is connected to the collector of the transistor in the driving circuit. When a plurality of P-channel MOS tubes are serially connected between the positive electrode of the power circuit and the positive electrode of the motor, the collector electrode of the triode in the P-channel MOS tube at the upper end in the communication driving circuit can be connected to the source electrode of the P-channel MOS tube at the lower end. The upper end refers to one end of the two PMOS tubes close to the anode of the power circuit, and the lower end refers to one end of the two PMOS tubes close to the anode of the motor.

When the PMOS + NMOS transistor combination mode is used to control the on or off of the motor, the specific circuit and implementation principle of the driving circuit of the NMOS transistor related to the motor are the same as those of the dual NMOS transistor shown in the first embodiment, and this embodiment is not limited and described again.

Further, as shown in fig. 4, in this embodiment, a sampling resistor (e.g., R6 in fig. 4) may be disposed in the motor power supply circuit, and the sampling resistor is used to detect the motor circuit current, so as to be used as a judgment basis for detecting whether the MOS transistor fails. When the PMOS + NMOS transistor combination mode is used to control the on or off of the motor, the specific circuit and implementation principle of the sampling resistor R6 related to the PMOS + NMOS transistor combination mode are the same as those of the dual NMOS transistor scheme shown in the first embodiment, and this embodiment is not limited or described in detail.

Specifically, the detecting the failure of the single MOS transistor by using the PMOS + NMOS transistor combination method may include: after double-click starting, a third control pin of the main control chip outputs a driving signal Motor _ P at a low level, a fourth control pin of the main control chip outputs a driving signal Motor _ N at a high level, at the moment, the Q4 is in a disconnected state, and the Q3 is in a connected state.

When Q4 is turned off and Q3 is turned on, if current in the loop is detected, the fact that Q4 is failed is indicated, and immediately after output driving signals Motor _ P and Motor _ N are both low, Q3 is turned off, and the current loop is closed.

When Q4 is off and Q3 is on, if there is no current in the detection loop, Q4 is normal, and then Q3 is detected. When the Q3 is detected, the third control pin of the main control chip outputs a driving signal Motor _ P at a high level, the fourth control pin of the main control chip outputs a Motor _ N bit at a low level, at this time, the Q4 is turned on, and the Q3 is turned off.

When the Q4 is conducted and the Q3 is disconnected, if the current in the loop is detected, the Q3 is failed; immediately after the output drives both Motor _ P and Motor _ N low, Q4 is turned off and the current loop is closed. When the Q4 is conducted and the Q3 is disconnected, if no current exists in the detection loop, the Q3 is normal, and the single MOS tube failure detection is finished. And only when both Q4 and Q3 detect normal, the two MOS tube conducting motors are driven to work.

In the description of the present invention, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "mouth" word structure "and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the structure referred to has a specific orientation, is constructed and operated in a specific orientation, and thus, is not to be construed as limiting the present invention.

In the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "connected," "directly connected," "indirectly connected," "fixedly connected," "mounted," and "assembled" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening media, or may be connected through two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A food processor with a motor switched on by a plurality of semiconductor switches is applied to a portable food processor and is characterized by comprising the motor and a power circuit, wherein the power circuit is used for supplying power to the motor;

when all the semiconductor switches are turned on, the motor is turned on.

2. The food processor of claim 1, wherein the semiconductor switch is a metal oxide semiconductor field effect transistor (MOS) transistor, and the negative terminal of the power circuit is connected to ground;

or,

when the semiconductor switch is a P-channel MOS tube, the P-channel MOS tube is connected between the positive electrode of the power circuit and the positive electrode of the motor in series.

3. The food processor of claim 2, wherein the number of the semiconductor switch assemblies is two, the semiconductor switches of the two semiconductor switch assemblies are both N-channel MOS transistors, and are respectively a first MOS transistor and a second MOS transistor, and the first MOS transistor and the second MOS transistor are connected in series between the negative pole of the motor and the ground terminal after being connected, wherein:

the source electrode of the first MOS tube is communicated with the drain electrode of the second MOS tube, the drain electrode of the first MOS tube is communicated with the negative electrode of the motor, and the source electrode of the second MOS tube is communicated with the grounding end;

the grid of the first MOS tube is communicated with the first control pin of the main control chip, and the grid of the second MOS tube is communicated with the second control pin of the main control chip.

4. The food processor of claim 2, wherein the number of semiconductor switch assemblies is two, the semiconductor switch of one of the semiconductor switch assemblies is a P-channel MOS transistor, the semiconductor switch of the other semiconductor switch assembly is an N-channel MOS transistor, the P-channel MOS transistor is connected in series between the positive pole of the power circuit and the positive pole of the motor, and the N-channel MOS transistor is connected in series between the negative pole of the motor and the ground terminal, wherein:

the drain electrode of the P-channel MOS tube is communicated with the anode of the power circuit, the source electrode of the P-channel MOS tube is communicated with the anode of the motor, and the grid electrode of the P-channel MOS tube is communicated with the third control pin of the main control chip;

and the drain electrode of the N-channel MOS tube is communicated with the negative electrode of the motor, the source electrode of the N-channel MOS tube is communicated with the grounding end, and the grid electrode of the N-channel MOS tube is communicated with the fourth control pin of the main control chip.

5. The food processor of any one of claims 1-4, further comprising a sampling resistor for detecting a motor supply loop current, the sampling resistor connected in series in the motor supply loop;

one end of the sampling resistor, which is far away from the grounding end, is communicated with the sampling pin of the main control chip, at least one semiconductor switch is disconnected, and when the sampling resistor has a voltage drop, the main control chip judges that the disconnected semiconductor switch is invalid.

6. The food processor of claim 5, wherein the sampling resistor is connected in series between a source terminal of the bottom N-channel MOS transistor and a ground terminal when the at least one semiconductor switch is an N-channel MOS transistor, the bottom N-channel MOS transistor being an N-channel MOS transistor adjacent to the ground terminal.

7. A food processor as claimed in any one of claims 2 to 4, wherein the food processor further comprises: the N communication drive circuit is used for controlling the on-off of an N-channel MOS tube, and is connected in series between a control pin of the main control chip and a grid electrode of the N-channel MOS tube, wherein:

8. A food processor as claimed in any one of claims 2 to 4, wherein the food processor further comprises: the P communication drive circuit is used for controlling the on-off of a P channel MOS tube, and is connected in series between a control pin of the main control chip and a grid electrode of the P channel MOS tube, wherein:

9. A food processor as claimed in any one of claims 2 to 4, wherein the food processor further comprises: and the anode of the diode is communicated with the cathode of the motor, and the cathode of the diode is communicated with the anode of the motor.

10. The food processor of any of claims 1-4, wherein the power circuit includes a battery assembly that provides a power source;

or,

the power circuit comprises a battery assembly and a charging port, wherein one of the battery assembly and the charging port provides power.