Food processor control circuit and food processor comprising the same

Abstract

The application provides a food processor control circuit and a food processor comprising the same. The food processor control circuit is applied to a food processor. The food processor comprises a motor. The food processor control circuit comprises a power input end, a motor driving circuit and a controller. The power input end is used for connecting a power supply. The motor driving circuit is connected to the power input end and the motor. The controller comprises a control unit and a pre-driving circuit. The pre-driving circuit is connected to the motor driving circuit. The control unit is integrated in the same chip with the pre-driving circuit and is used for controlling the pre-driving circuit to control the motor driving circuit to drive the motor to work. The pre-driving circuit and the control unit of the application are integrated in the same chip, thereby reducing circuit elements and wiring and reducing the circuit volume.

Description

Technical Field

[0001] This application relates to the field of small household appliance technology, and more particularly to a food processor control circuit and a food processor including the same. Background Technology

[0002] With the continuous improvement of living standards, many different types of food processors have appeared on the market. The functions of food processors can include, but are not limited to, making soy milk, juicing, making rice paste, mincing meat, shaved ice, making coffee and / or preparing face masks.

[0003] Food processors typically include a motor, which can be driven in two ways. The first method involves the main control chip driving the motor through an IPM (Intelligent Power Module). However, the IPM module requires numerous external drive circuit components, resulting in a large circuit size. The second method involves the main control chip driving the motor through an IGBT (Insulated Gate Bipolar Transistor) pre-driver module and an IGBT driver module. This method also suffers from complex external circuitry, numerous components, and a large footprint. Utility Model Content

[0004] This application provides a food processor control circuit and a food processor including the same, which has fewer circuit components and occupies less space.

[0005] This application provides a food processor control circuit for use in a food processor, the food processor including a motor, and the food processor control circuit including:

[0006] Power input terminal, used to connect to the power supply;

[0007] A motor drive circuit is connected to the power input terminal and the motor.

[0008] The controller includes a control unit and a pre-drive circuit. The pre-drive circuit is connected to the motor drive circuit. The control unit and the pre-drive circuit are integrated in the same chip and are used to control the pre-drive circuit to control the motor drive circuit to drive the motor to work.

[0009] In some embodiments, by integrating the pre-drive circuit and the control unit into the same chip, the number of circuit elements and wiring is reduced, and the circuit size is reduced.

[0010] Optionally, the controller includes a drive filter circuit and / or an overcurrent protection circuit, which are integrated into the same chip as the control unit and the pre-drive circuit.

[0011] In some embodiments, by integrating the drive filter circuit and / or overcurrent protection circuit with the control unit and pre-drive circuit into the same chip, the number of circuit components and wiring is reduced, and the circuit size is reduced.

[0012] Optionally, the food processor control circuit includes a high-voltage bootstrap circuit connected to the power input terminal and the controller, used to power the controller.

[0013] In some embodiments, the high-voltage bootstrap circuit can raise the voltage at the power input terminal to better power the controller.

[0014] Optionally, the controller includes a first power receiving port and a second power receiving port, and the high-voltage bootstrap circuit includes a bootstrap capacitor and a bootstrap diode. The bootstrap capacitor is connected between the first power receiving port and the second power receiving port, the anode of the bootstrap diode is connected to the power input terminal, and the cathode of the bootstrap diode is connected between the first power receiving port and the bootstrap capacitor.

[0015] In some embodiments, the bootstrap capacitor is used to store charge, the bootstrap diode can prevent current backflow, and the bootstrap capacitor and bootstrap diode can raise the voltage at the power input terminal to provide a stable drive voltage for the controller.

[0016] Optionally, the high-voltage bootstrap circuit further includes a bootstrap resistor connected between the power input terminal and the bootstrap diode.

[0017] In some embodiments, the bootstrap resistor can limit the current of the bootstrap capacitor to prevent overcurrent from damaging circuit components.

[0018] Optionally, the control unit includes a control port, and the motor drive circuit includes a multi-phase inverter bridge arm circuit. Each phase inverter bridge arm circuit includes a high-side controllable switch and a low-side controllable switch connected in series. The connection terminals of the high-side controllable switch and the low-side controllable switch are connected to one phase winding of the motor. The high-side controllable switch and the low-side controllable switch each include a controllable terminal. The controllable terminal of the high-side controllable switch is connected to the pre-drive circuit, and the controllable terminal of the low-side controllable switch is connected to the control port. The pre-drive circuit is used to control the high-side controllable switch, and the control port is used to control the low-side controllable switch.

[0019] In some embodiments, the high-end controllable switch is controlled by a pre-drive circuit, and the low-end controllable switch is controlled by the controller's control port. This can provide a suitable drive voltage for the high-end controllable switch without requiring additional isolation devices, thus reducing circuit size.

[0020] Optionally, the food processor control circuit further includes a current detection circuit, the control unit includes a current detection port, and the current detection circuit is connected to the multiphase inverter bridge arm circuit and the current detection port.

[0021] In some embodiments, the motor current can be detected through a current detection port, thereby controlling the motor operation.

[0022] Optionally, the food processor control circuit includes a motor drive control circuit, which is connected to the controller and the motor drive circuit.

[0023] In some embodiments, the motor drive circuit control circuit can control whether the motor drive circuit works, thereby improving the safety of the circuit.

[0024] Optionally, the motor drive control circuit includes a drive control diode, the anode of which is connected to the controllable terminals of the high-side controllable switch and the low-side controllable switch, and the cathode of which is connected to the controller.

[0025] In some embodiments, the function of a motor drive control circuit can be easily and conveniently achieved by driving and controlling diodes.

[0026] This application also provides a food processor, including a motor and a food processor control circuit as described in any of the above claims, wherein the food processor control circuit is connected to the motor.

[0027] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0029] Figure 1 The diagram shown is a structural schematic of one embodiment of the food processor of this application.

[0030] Figure 2 As shown Figure 1 A partial circuit diagram of one embodiment of the food processor shown.

[0031] Figure 3 As shown Figure 2 The diagram shows a partial circuit diagram of one embodiment of the food processor control circuit.

[0032] Figure 4 As shown Figure 3 Another part of the circuit diagram of one embodiment of the food processor control circuit shown.

[0033] Figure 5 As shown Figure 3 Another part of the circuit diagram of one embodiment of the food processor control circuit shown. Detailed Implementation

[0034] This application provides a food processor control circuit and a food processor including the same. The food processor control circuit and the food processor including the same are described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0035] Figure 1 The diagram shown is a structural schematic of one embodiment of the food processor 10 of this application. Figure 1 As shown, the food processor 10 includes: a main unit 11 and a food processor cup 12.

[0036] In some embodiments, the main unit 11 is in the form of a base unit. The main unit 11 can provide electrical power, control and drive the food processor 10, and can interact with the user.

[0037] The blending cup 12 can be assembled to the main unit 11. In some embodiments, the blending cup 12 is detachably installed on the main unit 11. The blending cup 12 can hold ingredients for cooking. When the blending cup 12 is installed on the main unit 11, the main unit 11 can control the food processor 10 to perform cooking, such as blending or heating the ingredients. Figure 1 This application is not limited to the food processor described in this exemplary embodiment. Figure 1 The food processor shown can be other types of food processors.

[0038] Figure 2 As shown Figure 1 A partial circuit diagram of one embodiment of the food processor 10 is shown. Figure 2 As shown, the food processor 10 includes a motor 13 and a food processor control circuit 20, which is connected to the motor 13. The motor drives components such as the mixing blade to process the ingredients. The food processor control circuit 20 controls the operation of the motor 13.

[0039] The food processor control circuit 20 includes: a power input terminal 21, a motor drive circuit 23, and a controller 25.

[0040] The power input terminal 21 is used to connect to a power source. The power input terminal 21 includes a first power input terminal L and a second power input terminal N. The power source can be AC ​​mains power.

[0041] The motor drive circuit 23 connects the power input terminal 21 and the motor 13. The power input terminal 21 provides power to the motor drive circuit 23, enabling the motor drive circuit 23 to drive the motor 13. The motor drive circuit 23 converts the electrical energy provided by the power input terminal 21 into a drive signal suitable for the operation of the motor 13 through power devices.

[0042] The controller 25 includes a control unit 29 and a pre-drive circuit 28. The pre-drive circuit 28 is connected to the motor drive circuit 23. The control unit 29 and the pre-drive circuit 28 are integrated in the same chip and are used to control the pre-drive circuit 28 to control the motor drive circuit 23 to drive the motor 13 to work.

[0043] The pre-drive circuit 28 is connected to the motor drive circuit 23, and then to the motor 13, for driving the motor 13. The pre-drive circuit 28 can improve the driving capability of the motor drive circuit 23.

[0044] The control unit 29 provides control commands to the food processor control circuit 20. The control unit 29 has built-in various control algorithms and logic programs for controlling the operation of the food processor 10. The control unit 29 is connected to the pre-drive circuit 28 and provides control commands to the pre-drive circuit 28.

[0045] The control unit 29 and the pre-drive circuit 28 are integrated into the same chip. If the control unit 29 and the pre-drive circuit 28 were designed separately, multiple independent chips would be required, and wiring would be necessary between the chips for signal transmission. Using the same chip for both the control unit 29 and the pre-drive circuit 28 significantly reduces signal transmission and wiring between chips, lowering circuit complexity and cost. Depending on actual needs, the control unit 29 and the pre-drive circuit 28 can reuse the ports of the controller 25. The control unit 29 and the pre-drive circuit 28 can share peripheral circuits such as drive circuits and filter circuits, reducing the number of circuit components. Integration of the control unit 29 and the pre-drive circuit 28 also reduces signal transmission paths, lowers signal delay and loss, and makes communication between the control unit 29 and the pre-drive circuit 28 more stable and faster.

[0046] In some embodiments, by integrating the pre-drive circuit 28 and the control unit 29 into the same chip, the number of circuit components and wiring is reduced, the circuit size is reduced, and the circuit cost is lowered.

[0047] The food processor control circuit 20 includes a rectifier circuit 26, connected to the power input terminal 21 and the motor drive circuit 23. Figure 2 In the illustrated embodiment, the rectifier circuit 26 is a bridge circuit. The rectifier circuit 26 can convert the AC power from the power input terminal 21 into DC power. Regardless of whether the output voltage of the power input terminal 21 is in the positive or negative half-cycle of AC, the output voltage of the rectifier circuit 26 is always a unidirectional DC voltage, which powers the motor drive circuit 23.

[0048] In some embodiments, the controller 25 includes a drive filter circuit and / or an overcurrent protection circuit, which are integrated into the same chip as the control unit 29 and the pre-drive circuit 28.

[0049] The control unit 29 and the pre-drive circuit 28 can share the drive filter circuit and the overcurrent protection circuit, which improves circuit reusability and reduces the number of circuit components.

[0050] The controller 25 may also include other peripheral circuits, which are integrated into the same chip as the control unit 29 and the pre-drive circuit 28.

[0051] By integrating the drive filter circuit and / or overcurrent protection circuit with the control unit 29 and the pre-drive circuit 28 into the same chip, the number of circuit components and wiring is reduced, and the circuit size is reduced.

[0052] In other embodiments, the control unit 29 includes drive filtering and overcurrent protection programs to implement the functions of the drive filtering circuit and the overcurrent protection circuit. Implementing the drive filtering circuit and the overcurrent protection circuit through software programs can further reduce the number of circuit components and the circuit size.

[0053] Figure 3 As shown Figure 2 A partial circuit diagram of one embodiment of the food processor control circuit 20 is shown.

[0054] Figure 4 As shown Figure 3 Another part of the circuit diagram of one embodiment of the food processor control circuit 20 shown.

[0055] Figure 5 As shown Figure 3 Another part of the circuit diagram of one embodiment of the food processor control circuit 20 shown.

[0056] The food processor control circuit 20 includes a high-voltage bootstrap circuit 27, which is connected to the power input terminal 21 and the controller 25, and is used to power the controller 25.

[0057] The high-voltage bootstrap circuit 27 connects the power input terminal 21 and the controller 25, and can transmit the output voltage of the power input terminal 21 to the controller 25 to power the controller 25. The high-voltage bootstrap circuit 27 can raise the voltage of the power input terminal 21 and transmit it to the controller 25, so that the controller 25 obtains a higher supply voltage than the voltage of the power input terminal 21.

[0058] In some embodiments, the high-voltage bootstrap circuit 27 can raise the voltage at the power input terminal 21 to better power the controller 25.

[0059] The controller 25 includes a first power receiving port VB3 and a second power receiving port VS3. The high-voltage bootstrap circuit 27 includes a bootstrap capacitor C9 and a bootstrap diode D6. The bootstrap capacitor C9 is connected between the first power receiving port VB3 and the second power receiving port VS3. The anode of the bootstrap diode D6 is connected to the power input terminal 21, and the cathode of the bootstrap diode D6 is connected between the first power receiving port VB3 and the bootstrap capacitor C9.

[0060] During the positive half-cycle of the input voltage at power input terminal 21, the bootstrap diode D6 conducts, and the voltage at power input terminal 21 charges the bootstrap capacitor C9 through the bootstrap diode D6. The voltage across the bootstrap capacitor C9 gradually increases until it approaches the voltage at power input terminal 21. During the negative half-cycle of the input voltage at power input terminal 21, the bootstrap diode D6 is turned off to prevent reverse current flow, and the bootstrap capacitor C9 discharges. The voltage of the bootstrap capacitor C9 is superimposed on the voltage at power input terminal 21, providing a drive voltage higher than the voltage at power input terminal 21 to the first power receiving port VB3 and the second power receiving port VS3 of the controller 25.

[0061] Specifically, the high-voltage bootstrap circuit 27 supplies power to the pre-drive circuit 28 of the controller 25. The pre-drive circuit 28 includes ports WH, UH, and VH, which output drive signals to drive the transistors in the motor drive circuit 23. The high-voltage bootstrap circuit 27 can supply power to ports WH, UH, and VH.

[0062] In some embodiments, the bootstrap capacitor C9 is used to store charge, the bootstrap diode D6 can prevent current backflow, and the bootstrap capacitor C9 and the bootstrap diode D6 can raise the voltage of the power input terminal 21 to provide a stable drive voltage for the controller 25.

[0063] The high-voltage bootstrap circuit 27 also includes a bootstrap resistor R1, which is connected between the power input terminal 21 and the bootstrap diode D6.

[0064] The bootstrap resistor R1 is connected to the first power input terminal L and the anode of the bootstrap diode D6, serving as a current limiter. In some embodiments, the resistance value of the bootstrap resistor R1 ranges from 5Ω to 15Ω.

[0065] In some embodiments, the bootstrap resistor R1 can limit the current of the bootstrap capacitor C9 to prevent overcurrent from damaging circuit components.

[0066] The control unit 29 includes control ports UL, VL, and WL. The motor drive circuit 23 includes a multi-phase inverter bridge arm circuit 210. Each phase inverter bridge arm circuit includes high-side controllable switches Q3, Q5, and Q6 and low-side controllable switches Q9, Q7, and Q8 connected in series. Specifically, high-side controllable switch Q3 and low-side controllable switch Q9 are connected in series, high-side controllable switch Q5 and low-side controllable switch Q7 are connected in series, and high-side controllable switch Q6 and low-side controllable switch Q8 are connected in series. The connection terminals MOTO-U, MOTO-V, and MOTO-W of the high-end controllable switches Q3, Q5, and Q6 and the low-end controllable switches Q9, Q7, and Q8 are respectively connected to one phase winding of motor 13. The connection terminal MOTO-U of the high-end controllable switch Q3 and the low-end controllable switch Q9 is connected to the U-phase winding of motor 13. The connection terminal MOTO-V of the high-end controllable switch Q5 and the low-end controllable switch Q7 is connected to the V-phase winding of motor 13. The connection terminal MOTO-W of the high-end controllable switch Q6 and the low-end controllable switch Q8 is connected to the W-phase winding of motor 13.

[0067] High-end controllable switches Q3, Q5, and Q6, and low-end controllable switches Q9, Q7, and Q8 each include controllable terminals UHG, VHG, WHG, ULG, VLG, and WLG. The controllable terminals UHG, VHG, and WHG of the high-end controllable switches Q3, Q5, and Q6 are connected to the pre-drive circuit 28. The controllable terminal UHG is connected to the UH port of the pre-drive circuit 28, the controllable terminal VHG is connected to the VH port of the pre-drive circuit 28, and the controllable terminal WHG is connected to the WH port of the pre-drive circuit 28. The controllable terminals ULG, VLG, and WLG of the low-end controllable switches Q9, Q7, and Q8 are connected to the control ports UL, VL, and WL. The controllable terminal ULG is connected to the control port UL, the controllable terminal VLG is connected to the control port VL, and the controllable terminal WLG is connected to the control port WL. The pre-drive circuit 28 controls the high-side controllable switches Q3, Q5, and Q6, while control ports UL, VL, and WL control the low-side controllable switches Q9, Q7, and Q8. The high-side controllable switches Q3, Q5, and Q6 require higher drive voltages. Because the pre-drive circuit 28 is connected to the high-voltage bootstrap circuit 27, it can provide higher drive voltages for the high-side controllable switches Q3, Q5, and Q6.

[0068] In some embodiments, the high-end controllable switches Q3, Q5, and Q6 are controlled by the pre-drive circuit 28, and the low-end controllable switches Q9, Q7, and Q8 are controlled by the control ports UL, VL, and WL of the controller 25. This can provide suitable drive voltages for the high-end controllable switches Q3, Q5, and Q6 without the need for additional isolation devices, thus reducing the circuit size.

[0069] The food processor control circuit 20 also includes a current detection circuit 24, and the control unit 29 includes a current detection port OCP. The current detection circuit 24 is connected to the multiphase inverter bridge arm circuit 210 and the current detection port OCP.

[0070] The current detection circuit 24 can detect the current of the motor 13, thereby reflecting whether the motor 13 has experienced overcurrent or other faults. The controller 25 receives the current detected by the current detection circuit 24 through the current detection port OCP, determines the operating state of the motor 13, and then controls the operating state of the motor 13.

[0071] In some embodiments, the current of the motor 13 can be detected through the current detection port OCP, thereby controlling the operation of the motor 13.

[0072] The controller 25 includes an OPA1_IP port and an OPA1_IN port, which are connected to the U phase of the motor 13 and used to acquire the U phase current of the motor 13. The controller 25 also includes an OPA0_IP port and an OPA0_IN port, which are connected to the V phase of the motor 13 and used to acquire the V phase current of the motor 13.

[0073] The food processor control circuit 20 includes a motor drive control circuit 220, which connects the controller 25 and the motor drive circuit 23.

[0074] The motor drive control circuit 220 connects to the controllable terminals UHG, VHG, and WHG of the high-end controllable switches Q3, Q5, and Q6 in the motor drive circuit 23, as well as the UH, VH, and WH ports of the pre-drive circuit 28, and is used to control the connection between the pre-drive circuit 28 and the high-end controllable switches Q3, Q5, and Q6.

[0075] The motor drive control circuit 220 is also connected to the controllable terminals ULG, VLG, and WLG of the low-end controllable switches Q9, Q7, and Q8, as well as the control ports UL, VL, and WL of the controller 25, for controlling the connection between the controller 25 and the low-end controllable switches Q9, Q7, and Q8.

[0076] In some embodiments, the motor drive circuit control circuit 220 can control whether the motor drive circuit 23 is connected to the controller 25, control whether the motor drive circuit 23 is working, and disconnect the connection between the motor drive circuit 23 and the controller 25 when necessary, thereby improving the safety of the circuit.

[0077] The motor drive control circuit 220 includes drive control diodes D8, D10, D13, D14, D16, and D17. The anodes of the drive control diodes D8, D10, D13, D14, D16, and D17 are connected to the controllable terminals of the high-side controllable switches Q3, Q5, and Q6 and the low-side controllable switches Q9, Q7, and Q8. The cathodes of the drive control diodes are connected to the controller 25.

[0078] The drive control diode D8 is connected to the controllable terminals UHG and UH, the drive control diode D10 is connected to the controllable terminals ULG and UL, the drive control diode D13 is connected to the controllable terminals VHG and VH, the drive control diode D14 is connected to the controllable terminals VLG and VL, the drive control diode D15 is connected to the controllable terminals WHG and WH, and the drive control diode D17 is connected to the controllable terminals WLG and WL.

[0079] By driving and controlling diodes D8, D10, D13, D14, D16, and D17, the on and off times of high-end controllable switches Q3, Q5, and Q6, as well as low-end controllable switches Q9, Q7, and Q8, can be controlled, thereby controlling the operation of the motor drive circuit 23.

[0080] In some embodiments, the function of the motor drive control circuit 220 can be easily and conveniently achieved by driving control diodes D8, D10, D13, D14, D16, and D17.

Claims

1. A food processor control circuit, characterized in that, Applied to a food processor, the food processor includes a motor, and the food processor control circuit includes: Power input terminal, used to connect to the power supply; A motor drive circuit is connected to the power input terminal and the motor. The controller includes a control unit and a pre-drive circuit. The pre-drive circuit is connected to the motor drive circuit. The control unit and the pre-drive circuit are integrated in the same chip and are used to control the pre-drive circuit to control the motor drive circuit to drive the motor to work.

2. The food processor control circuit according to claim 1, characterized in that, The controller includes a drive filter circuit and / or an overcurrent protection circuit, and is integrated into the same chip as the control unit and the pre-drive circuit.

3. The food processor control circuit according to claim 1, characterized in that, The food processor control circuit includes a high-voltage bootstrap circuit, which is connected to the power input terminal and the controller to supply power to the controller.

4. The food processor control circuit according to claim 3, characterized in that, The controller includes a first power receiving port and a second power receiving port. The high-voltage bootstrap circuit includes a bootstrap capacitor and a bootstrap diode. The bootstrap capacitor is connected between the first power receiving port and the second power receiving port. The anode of the bootstrap diode is connected to the power input terminal, and the cathode of the bootstrap diode is connected between the first power receiving port and the bootstrap capacitor.

5. The food processor control circuit according to claim 4, characterized in that, The high-voltage bootstrap circuit also includes a bootstrap resistor connected between the power input terminal and the bootstrap diode.

6. The food processor control circuit according to claim 1, characterized in that, The control unit includes a control port, and the motor drive circuit includes a multi-phase inverter bridge arm circuit. Each phase inverter bridge arm circuit includes a high-side controllable switch and a low-side controllable switch connected in series. The connection terminals of the high-side controllable switch and the low-side controllable switch are connected to one phase winding of the motor. The high-side controllable switch and the low-side controllable switch each include a controllable terminal. The controllable terminal of the high-side controllable switch is connected to the pre-drive circuit, and the controllable terminal of the low-side controllable switch is connected to the control port. The pre-drive circuit is used to control the high-side controllable switch, and the control port is used to control the low-side controllable switch.

7. The food processor control circuit according to claim 6, characterized in that, The food processor control circuit also includes a current detection circuit, and the control unit includes a current detection port. The current detection circuit is connected to the multiphase inverter bridge arm circuit and the current detection port.

8. The food processor control circuit according to claim 6, characterized in that, The food processor control circuit includes a motor drive control circuit, which connects the controller and the motor drive circuit.

9. The food processor control circuit according to claim 8, characterized in that, The motor drive control circuit includes a drive control diode. The anode of the drive control diode is connected to the controllable terminals of the high-end controllable switch and the low-end controllable switch, and the cathode of the drive control diode is connected to the controller.

10. A food processor, characterized in that, It includes a motor and a food processor control circuit as described in any one of claims 1-9, wherein the food processor control circuit is connected to the motor.

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