Protection module and portable food processing device

Abstract

The present invention discloses a protection module and a portable food processing device. The protection module is applied to the portable food processing device and includes a main control circuit, two switch circuits, and a sampling circuit. Before the motor starts, the main control circuit first turns on any switch circuit, obtains the voltage value output by the sampling circuit, and then compares this voltage value with a preset threshold value. Based on the comparison result, it can be determined whether the other switch circuit has an abnormality. If no abnormality has occurred, the other switch circuit is turned on; if an abnormality has occurred, the turned-on switch circuit is turned off. Therefore, the protection module will not lose its function of controlling the motor due to an abnormality in a single switch circuit, and the motor will not become uncontrollable, thereby improving the safety of the portable food processing device.

Description

Technical Field

[0001] The present invention relates to the technical field of motor control, and in particular to a protection module and a portable food processing device. Background Art

[0002] Existing portable food processing devices primarily include juicers, portable juicers, food processors, and food processors. These devices primarily consist of a handpiece, a cup detachably connected to the handpiece, and a crushing blade. Furthermore, the handpiece houses a motor and a control circuit that starts and stops the motor. This control circuit activates the motor, which in turn drives the crushing blade to achieve food processing.

[0003] Currently, motor start and stop control is typically achieved through a control circuit, typically using a field-effect transistor (MOSFET). However, if this MOSFET experiences an abnormality (such as failure, short circuit, or an abnormality in the control voltage), the motor becomes uncontrollable. In this case, since the handpiece and cup are detachably connected, if the user unscrews the cup, the crushing blades are exposed, potentially leading to a safety accident. Summary of the Invention

[0004] Based on this, the present invention provides a protection module and a portable food processing device to improve the safety of the portable food processing device.

[0005] In a first aspect, the present invention provides a protection module for use in a portable food processing device, wherein the portable food processing device comprises: a power circuit and a motor connected to the power circuit, wherein the protection module comprises:

[0006] Main control circuit;

[0007] Two switch circuits, both of which are connected to the main control circuit to be turned on or off respectively under the control of the main control circuit;

[0008] a sampling circuit, the sampling circuit being connected to the main control circuit and configured to convert a current value provided by a power supply circuit to the motor into a voltage value;

[0009] The two switching circuits and the sampling circuit are connected in series to the power supply circuit and the motor; the main control circuit is used to: before the motor is started, control any one of the two switching circuits to be turned on, obtain the voltage value output by the sampling circuit, compare the voltage value with a preset threshold, and determine whether to turn on the other switching circuit or turn off the turned-on switching circuit based on the comparison result.

[0010] Furthermore, the switching circuit includes a switching tube; the switching tube is connected in series to the power supply circuit and the motor; the control pin of the switching tube is connected to an output pin of the main control circuit to be turned on or off under the control of the output pin of the main control circuit.

[0011] Furthermore, the switching circuit also includes a discharge resistor and a current limiting resistor; the discharge resistor is connected in series to the control pin and the output pin of the switching tube; the current limiting resistor is connected in series to the control pin of the switching tube and the output pin of the main control circuit.

[0012] Furthermore, the switching tube is a triode or a field effect tube.

[0013] Furthermore, the sampling circuit includes a sampling resistor and a filter; the sampling resistor is connected in series to the power supply circuit and the motor; the filter is connected in parallel to the sampling resistor and connected to an input pin of the main control circuit.

[0014] Furthermore, the main control circuit is further configured to: control any one of the two switch circuits to be turned on, and then obtain the voltage value output by the sampling circuit after a preset time.

[0015] Furthermore, the main control circuit is used to: after controlling any one of the two switch circuits to be turned on, if the voltage value is less than the preset threshold, turn on the other switch circuit.

[0016] Furthermore, the main control circuit is used to: after controlling any one of the two switch circuits to be turned on, if the voltage value is greater than or equal to the preset threshold, turn off the turned-on switch circuit.

[0017] Furthermore, the main control circuit is used to generate an alarm message while turning off the switched-on switch circuit.

[0018] In a second aspect, the present invention provides a portable food processing device, comprising: a cup body, a head and a crushing tool; wherein the head is provided with a power supply circuit, a motor and the protection module as described in the first aspect.

[0019] The present invention discloses a protection module and a portable food processing device. The protection module is applied to the portable food processing device and includes a main control circuit, two switch circuits, and a sampling circuit. Before the motor starts, the main control circuit first turns on any switch circuit, obtains the voltage value output by the sampling circuit, and then compares this voltage value with a preset threshold value. Based on the comparison result, it can be determined whether the other switch circuit has an abnormality. If no abnormality has occurred, the other switch circuit is turned on; if an abnormality has occurred, the turned-on switch circuit is turned off. Therefore, the protection module will not lose its function of controlling the motor due to an abnormality in a single switch circuit, and the motor will not become uncontrollable, thereby improving the safety of the portable food processing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the circuit structure of a control circuit provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the circuit structure of a protection module provided in an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a specific circuit structure of a protection module in an embodiment of the present invention;

[0024] Figure 4 Schematic diagram of the circuit structure of the first switch circuit in an embodiment of the present invention;

[0025] Figure 5 Schematic diagram of the circuit structure of the second switch circuit in an embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the circuit structure of the sampling circuit in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] It should be understood that the terms used in this specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the specification and appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0029] It should also be understood that the terms "first", "second", "third", "fourth", etc. (if any) in the description, claims or above-mentioned drawings of the present invention are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features.

[0030] It should be further understood that the term "and / or" used in the present description and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0031] Existing portable food processing devices, such as portable juicers, primarily control the start and stop of their motors through a MOSFET. However, the inventors discovered that if this MOSFET fails, shorts, or its control voltage becomes abnormal, it loses its motor start and stop function, rendering the motor uncontrollable. In this case, since the handpiece and cup are detachably connected, attempting to unscrew the cup could result in a safety incident, such as a finger being scratched by the crushing blade.

[0032] Based on this, this embodiment provides a portable food processing device, which includes a cup body, a machine head and a crushing tool. Figure 1 The control circuit shown includes a power supply circuit 10 , a motor 20 and a protection module 30 .

[0033] The power supply circuit 10 may include a single lithium battery, multiple lithium batteries connected in series, or other circuits that can provide a stable working power supply for the motor 20 .

[0034] The power circuit 10, the motor 20 and the protection module 30 are connected in series, thereby forming a control circuit for the motor 20. It can be understood that this is equivalent to connecting the protection module 30 in series with the power supply circuit 10 and the motor 20.

[0035] The circuit structure of the protection module 30 is as follows: Figure 2As shown, it includes a main control circuit 310, two switch circuits (320 and 330) and a sampling circuit 340. It should be noted that, in order to facilitate distinction and understanding of the technical solution of the present invention, this embodiment uses a first switch circuit 320 and a second switch circuit 330 to distinguish the two switch circuits.

[0036] The main control circuit 310 includes a microcontroller unit (MCU). Specifically, the microcontroller unit executes the functions that can be achieved by the main control circuit 310 described in this embodiment to improve the safety of the portable food processing device.

[0037] The first switching circuit 320, the second switching circuit 330, and the sampling circuit 340 are connected in series to the power supply circuit 10 and the motor 20. Furthermore, both switching circuits are connected to the main control circuit 310, enabling each switching circuit to be turned on or off independently under the control of the main control circuit 310. The sampling circuit 340 is also connected to the main control circuit 310 and is configured to convert the current value provided by the power supply circuit 10 to the motor 20 into a voltage value, thereby enabling the main control circuit 310 to obtain this voltage value.

[0038] Based on the above-mentioned protection module 30, before the motor 20 starts, the main control circuit 310 first turns on any one of the switch circuits and then obtains the voltage value output by the sampling circuit 340. Specifically, the voltage value obtained when there is no abnormality in both switch circuits is different from the voltage value obtained when there is an abnormality in one of the switch circuits. Therefore, the voltage value is compared with a preset threshold value, and finally, based on the comparison result, it is determined whether to turn on the other switch circuit or whether to turn off the switched-on switch circuit. Among them, the preset threshold value can be set according to actual conditions, or it can be set according to the power supply circuit 10 and the motor 20. In this way, the protection module 30 will not lose its function of controlling the motor 20 due to an abnormality in a single switch circuit, so the motor 20 will not become uncontrollable.

[0039] In some embodiments, after the main control circuit 310 turns on any switching circuit, the voltage value output by the sampling circuit 340 can be obtained after a preset time, for example, after 100ms. This ensures that the main control circuit 310 can obtain the voltage value, thereby improving the reliability of the protection module 30.

[0040] In some embodiments, during the current startup of the motor 20, the main control circuit 310 can record the switch circuit that was preferentially turned on during the current startup. During the next startup of the motor, the main control circuit 310 can preferentially turn on the other switch circuit. For example, if the main control circuit 310 preferentially turns on the first switch circuit 320 during the current startup of the motor 20, the main control circuit 310 preferentially turns on the second switch circuit 330 during the next startup of the motor 20. As can be seen, the two switch circuits are preferentially turned on alternately, thereby enabling alternating detection of the two switch circuits.

[0041] In some embodiments, the voltage value obtained when no abnormality occurs in either switching circuit will be less than a preset threshold. Therefore, after the main control circuit 310 controls any one of the two switching circuits to turn on, it can determine whether the voltage value is less than the preset threshold, and if so, turn on the other switching circuit.

[0042] In some embodiments, the voltage value obtained when one of the switch circuits experiences an abnormality may be greater than or equal to a preset threshold. Therefore, after controlling either of the two switch circuits to conduct, the main control circuit 310 may determine whether the voltage value is greater than or equal to the preset threshold, and if so, shut off the switched-on switch circuit. In some further embodiments, the active circuit 310 simultaneously generates an alarm message upon shutting off the switched-on switch circuit, prompting the user to repair the portable food processing device.

[0043] For example, before the motor 20 starts, the main control circuit 310 first turns on the first switch circuit 320 and then obtains the voltage value output by the sampling circuit 340. Based on the comparison result of this voltage value with a preset threshold, it can be determined whether the second switch circuit 330 has an abnormality. If the voltage value is less than the preset threshold, it is determined that the second switch circuit 330 has not an abnormality. The second switch circuit 330 is then turned on, allowing the power supply circuit 10 to provide a stable operating power supply to the motor 20. This allows the motor to drive the shredding blades to rotate, achieving the purpose of food processing, such as juicing fruit. However, if the voltage value is greater than or equal to the preset threshold, it is determined that the second switch circuit 330 has an abnormality. At this point, the second switch circuit 330 has lost its control function. Therefore, the main control circuit 310 turns off the first switch circuit 320, and the motor 20 does not start. This prevents the protection module 30 from causing the motor 20 to become uncontrollable due to an abnormality in the second switch circuit 330, thereby improving the safety of the portable food processing device.

[0044] In some embodiments, the switching circuit includes a switching tube, which can be a transistor or a field-effect tube, wherein the switching tube is connected in series to the power supply circuit 10 and the motor 20. In addition, the control pin of the switching tube is connected to an output pin of the main control circuit 310, so that it can be turned on or off under the control of the output pin of the main control circuit 310.

[0045] For example, Figure 3 As shown, the first switch circuit 320 includes a first switch tube 321, which is connected in series with the motor 20 and the second switch module 330. Specifically, the control pin of the first switch tube 321 is connected to the first output pin OUT1 of the main control circuit 310. In this way, the main control circuit 310 can control the first switch tube 321 to be turned on or off through the first output pin OUT1.

[0046] For example, Figure 3 As shown, the second switch circuit 330 includes a second switch tube 331, which is connected in series with the first switch module 320 and the sampling circuit 340. Specifically, the control pin of the second switch tube 331 is connected to the second output pin OUT2 of the main control circuit 310. In this way, the main control circuit 310 can control the second switch tube 331 to be turned on or off through the second output pin OUT2.

[0047] In some further embodiments, the switching circuit further includes a discharge resistor and a current-limiting resistor. The discharge resistor is connected in series between the control pin and the output pin of the switch, while the current-limiting resistor is connected in series between the control pin of the switch and the output pin of the main control circuit 310. In this way, the discharge resistor and the current-limiting resistor can not only improve the operating efficiency of the switch but also extend the life of the switch. It should be noted that the resistance values ​​of the discharge resistor and the current-limiting resistor can be set according to actual conditions.

[0048] For example, Figure 4 As shown, the first switching transistor 321 is a field-effect transistor (MOS transistor). The drain D of the MOS transistor is connected to the motor 20, the source S is connected to the second switching circuit 320, and the gate G is connected to the first output pin OUT1 of the main control circuit via a first current-limiting resistor R2. In addition, a first discharge resistor R1 is connected in series between the gate G and source S of the MOS transistor.

[0049] For example, Figure 5 As shown, the second switching transistor 331 is a triode, with its collector c connected to the first switching circuit 320, its emitter e connected to the sampling circuit 340, and its base b connected to the second output pin OUT2 of the main control circuit via a second current-limiting resistor R4. Furthermore, a second discharge resistor R3 is connected in series between the base b and emitter e of the triode.

[0050] In some embodiments, as Figure 3 As shown, sampling circuit 340 includes a sampling resistor R5 and a filter 341. Specifically, sampling resistor R5 is connected in series with power supply circuit 10 and motor 20. Sampling resistor R5 is used to convert the current value provided by power supply circuit 10 to motor 10 into a voltage value. Filter 341 is connected in parallel with sampling resistor R5 and to an input pin IN1 of main control circuit 310. It is used to filter the voltage signal input to main control circuit 310 and protect main control circuit 310. It should be noted that the resistance value of sampling resistor R5 and filter 341 can be set according to actual conditions.

[0051] For example, Figure 6 As shown, the filter 341 includes a filter resistor R6 and a filter capacitor C1. It can be clearly seen from the figure that the filter 341 composed of the filter resistor R6 and the filter capacitor C1 is connected in parallel with the sampling resistor R5 and is connected to the first input pin IN1 of the main control circuit 310.

[0052] In summary, the protection module 30 provided in this embodiment, applied to a portable food processing device, includes a main control circuit 310, two switch circuits (320 and 330), and a sampling circuit 340. Before the motor 20 starts, the main control circuit 310 first turns on one of the switch circuits, obtains the voltage value output by the sampling circuit 340, and then compares this voltage value with a preset threshold value. Based on the comparison result, it can be determined whether the other switch circuit has an abnormality. If no abnormality has occurred, the other switch circuit is turned on; if an abnormality has occurred, the turned-on switch circuit is turned off. Therefore, the protection module 30 will not lose its function of controlling the motor 20 due to an abnormality in a single switch circuit, and thus the motor 20 will not become uncontrollable, thereby improving the safety of the portable food processing device.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A protection module, applied to a portable food processing device, the portable food processing device comprising: A power supply circuit and a motor connected to the power supply circuit, wherein the protection module comprises: Main control circuit; Two switching circuits, each comprising a switching tube, a discharge resistor, and a current-limiting resistor; the switching tube comprising a field-effect tube or a triode; the discharge resistor being connected in series to a control pin and an output pin of the switching tube; and the current-limiting resistor being provided between the switching tube and the main control circuit; both switching circuits being connected to the main control circuit to be turned on or off under the control of the main control circuit; a sampling circuit, the sampling circuit being connected to the main control circuit and configured to convert a current value provided by a power supply circuit to the motor into a voltage value; The two switching circuits and the sampling circuit are connected in series to the power supply circuit and the motor; the main control circuit is used to: before the motor starts, control one of the two switching circuits to turn on, obtain the voltage value output by the sampling circuit, compare the voltage value with a preset threshold, and if the voltage value is less than the preset threshold, turn on the other switching circuit; if the voltage value is greater than or equal to the preset threshold, turn off the switched circuit that has been turned on; during the motor startup process, record the switching circuit that is turned on first in this process, and start the other switching circuit first during the next startup of the motor.

2. The protection module according to claim 1, characterized in that: The switch tube is connected in series to the power supply circuit and the motor; the control pin of the switch tube is connected to an output pin of the main control circuit to be turned on or off under the control of the output pin of the main control circuit.

3. The protection module according to claim 1, characterized in that: The current limiting resistor is connected in series to the control pin of the switch tube and the output pin of the main control circuit.

4. The protection module according to claim 1, characterized in that: The sampling circuit includes a sampling resistor and a filter; The sampling resistor is connected in series to the power supply circuit and the motor; the filter is connected in parallel to the sampling resistor and is connected to an input pin of the main control circuit.

5. The protection module according to claim 1, characterized in that: The main control circuit is further configured to: control any one of the two switch circuits to be turned on, and then obtain the voltage value output by the sampling circuit after a preset time.

6. The protection module according to claim 1, characterized in that: The main control circuit is used to: turn off the switched-on switch circuit and generate alarm information at the same time.

7. A portable food processing device, characterized in that: The portable food processing device includes: a cup body, a head and a crushing tool; wherein the head is provided with a power supply circuit, a motor and the protection module according to any one of claims 1-6.

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