Control circuit and food processor

Abstract

The application provides a control circuit and a food processor, wherein the control circuit comprises: a motor driving circuit having a first connection end, the motor driving circuit normally operates when the first connection end is grounded; a cover detection circuit for detecting the opening and closing state of the cover, the cover detection circuit has a second connection end, and the first connection end is connected with the second connection end; wherein when the cover is in the opening state, the cover detection circuit pulls the first connection end to be suspended, and when the cover is in the closing state, the cover detection circuit pulls the first connection end to be grounded; in this process, the opening and closing state of the door directly affects whether the motor driving circuit normally operates, so that the probability that the motor driving circuit controls the motor to operate when the cover is in the opening state is reduced, and the safety of the motor operation is improved.

Description

Technical Field

[0001] This invention relates to the field of circuit control technology, and more specifically, to a control circuit and a food processor. Background Technology

[0002] Currently, in the noodle machine industry, the motor is controlled by directly cutting off the high voltage. This control scheme is not very reliable and poses safety risks. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, a first aspect of the present invention is to provide one type of control circuit.

[0005] A second aspect of the present invention is that a second control circuit is provided.

[0006] A third aspect of the present invention is that a food processing machine is provided.

[0007] In view of this, according to a first aspect of the present invention, the present invention provides a control circuit, comprising: a motor drive circuit having a first connection terminal, wherein the motor drive circuit operates normally when the first connection terminal is grounded; and a cover detection circuit for detecting the opening and closing state of the cover, having a second connection terminal, wherein the first connection terminal is connected to the second connection terminal; wherein, when the cover is in an open state, the cover detection circuit pulls the first connection terminal to suspend it, and when the cover is in a closed state, the cover detection circuit pulls the first connection terminal to ground.

[0008] This application proposes a control circuit that includes a motor drive circuit for controlling the operation of a motor and a cover detection circuit for detecting the opening and closing state of a cover. Since the cover detection circuit is connected to the first connection terminal of the motor drive circuit, the opening and closing state of the cover is fed back to the motor drive circuit. For example, when the cover is in the open state, the cover detection circuit pulls the first connection terminal to suspend it, preventing the motor drive circuit from operating normally. Conversely, when the cover is in the closed state, the cover detection circuit pulls the first connection terminal to ground, allowing the motor drive circuit to meet the conditions for normal operation and thus operate normally.

[0009] During this process, the opening and closing state of the door directly affects whether the motor drive circuit operates normally. Therefore, it can reduce the probability of the motor drive circuit controlling the motor to run when the cover is open, thereby improving the safety of motor control.

[0010] Furthermore, in the above technical solution, the connection between the cover detection circuit and the motor drive circuit is used to control the motor. This is a process of using weak current detection and controlling strong current based on the weak current detection results, which ensures the safety and compliance of motor control.

[0011] In addition, the control circuit proposed in this application also includes the following additional technical features.

[0012] In the above technical solution, the cover detection circuit includes: a first switching transistor, the first end of which is a second connection terminal, and the second end of which is grounded; a first power supply; and a detection switch having a first pin and a second pin, the first pin being connected to the first power supply and the control terminal of the first switching transistor, and the second pin being grounded; wherein, when the cover is in the open state, the first pin and the second pin are not connected, the first end and the second end of the first switching transistor are disconnected, and the first connection terminal is suspended; when the cover is in the closed state, the first pin and the second pin are connected, the first end and the second end of the first switching transistor are connected, and the first connection terminal is grounded.

[0013] In this technical solution, the open and closed states of the cover can be characterized by the state of the detection switch. Specifically, when the cover is in the open state, the first and second pins are not connected, and conversely, when the cover is in the closed state, the first and second pins are connected. Therefore, the open and closed state of the cover can be known by whether the first and second pins of the detection switch are connected, thereby realizing the acquisition of the open and closed state of the cover.

[0014] The first power supply is used to transmit an electrical signal to the first switching transistor to detect whether the first and second pins of the switch are connected. This signal is then used to switch the state of the first connection terminal by controlling the operation of the first switching transistor. Specifically, when the first and second pins of the first switching transistor are disconnected, the second connection terminal is not grounded through the first switching transistor. Therefore, the first connection terminal connected to the second connection terminal is suspended. Conversely, when the first and second pins of the first switching transistor are connected, the second connection terminal is grounded through the first switching transistor. Therefore, the first connection terminal connected to the second connection terminal is also grounded.

[0015] In the above technical solution, the opening and closing state of the cover is acquired and converted into an electrical signal that can be recognized by the circuit components by setting a first switching tube, a first power supply and a detection switch, thereby realizing the control of the suspension and grounding of the first connection terminal. In this process, the circuit structure for controlling the suspension and grounding of the first connection terminal is simple and low in cost, ensuring the reliability of the control circuit.

[0016] In the above technical solution, there is a connection point between the first pin, the first power supply and the control terminal of the first switching transistor. The cover detection circuit also includes: a first capacitor, the first end of the first capacitor is connected to the connection point and the second end of the first capacitor is connected to the second pin.

[0017] In this technical solution, a first capacitor is used to limit the response speed of the first switching transistor. Specifically, when the cover is open, the first power supply charges the first capacitor. As charging progresses, the voltage across the first capacitor continuously increases until it can no longer increase. Conversely, when the cover is closed, because the first and second pins of the detection switch are connected, the first capacitor forms a circuit with the grounding point through the detection switch. At this time, the electrical energy stored in the first capacitor is continuously released, and the voltage across the first capacitor continuously decreases. When the voltage drops to the level that satisfies the turn-on voltage of the first switching transistor, the first and second pins of the first switching transistor are connected. At this time, the first connection terminal of the motor drive circuit is grounded.

[0018] In the above process, the charging and discharging of the first capacitor requires a certain amount of time, which can be used as a delay time for the control circuit to avoid the motor drive circuit frequently switching between normal and abnormal operation states, thereby improving the reliability of the control circuit operation.

[0019] In the above technical solution, there is a connection point between the first pin, the first power supply and the control terminal of the first switching transistor. The cover detection circuit also includes a first resistor located between the control terminal of the first switching transistor and the connection point.

[0020] In this technical solution, by setting a first resistor, the current flowing through the control terminal of the first switching transistor is limited, thereby avoiding the probability of the first switching transistor being damaged due to overcurrent during actual use, thus improving the reliability of the control circuit operation.

[0021] In the above technical solution, there is a connection point between the first pin, the first power supply and the control terminal of the first switching transistor. The cover detection circuit also includes a second resistor located between the first power supply and the connection point.

[0022] In this technical solution, by setting a second resistor, the voltage at the connection point can be reasonably set, thereby reducing the probability of safety risks that may occur in the actual use of the control circuit due to excessive voltage at the connection point.

[0023] Furthermore, when both the first capacitor and the second resistor are present, the first resistor limits the charging current when the first power supply charges the first capacitor, thus preventing the first power supply and / or the first capacitor from malfunctioning due to excessive charging current during the charging process. It is understood that the second resistor can reduce the charging current when the first capacitor is charged, thereby ensuring the stability of the control circuit during operation.

[0024] In one of the technical solutions, the value of the second resistor can be selected according to the actual application scenario, and its specific value is not limited here.

[0025] In the above technical solution, there is a connection point between the first pin, the first power supply and the control terminal of the first switching transistor. The cover detection circuit also includes a third resistor, located between the connection point and the first pin.

[0026] In this technical solution, a third resistor is set to limit the current flowing through the detection switch, preventing the detection switch from malfunctioning due to excessive current when the first and second pins of the detection switch are connected. It is understood that the third resistor can reduce the current flowing through the detection switch during operation, thus ensuring the stability of the control circuit.

[0027] Furthermore, when the cover is closed, a third resistor is used to accelerate the release of electrical energy from the first capacitor, thereby improving the overall response speed of the control circuit and enhancing the user experience of the control circuit.

[0028] In one technical solution, the motor drive circuit includes: at least two power supply lines, each power supply line including two sub-terminals; at least two relays, each corresponding to one of the at least two power supply lines, each relay including a first stationary contact, a second stationary contact and a moving contact, the first stationary contact and the second stationary contact being connected to the corresponding two sub-terminals respectively, and the moving contact being used to connect to the motor; at least two switching devices, each corresponding to one of the relays, the first end of each switching device being connected to the corresponding relay, the second end of each switching device being a first connection end, and each switching device being used to control the corresponding relay to switch the connection state of the moving contact with the first stationary contact and the second stationary contact, so as to switch the rotation direction of the motor.

[0029] This technical solution provides a specific structure for the motor drive circuit. Specifically, by defining the included power supply lines, and with each power supply line including two sub-terminals, the forward and reverse rotation of the motor can be controlled by utilizing the connection state of the moving contact with the first stationary contact and the second stationary contact after the relay is connected to the sub-terminals.

[0030] Specifically, in one possible technical solution, when the switching device is turned on, the moving contact of the relay is connected to the first stationary contact, and when the switching device is turned off, the moving contact of the relay is connected to the second stationary contact.

[0031] Specifically, in one possible technical solution, when the switching device is off, the moving contact of the relay is connected to the first stationary contact, and when the switching device is on, the moving contact of the relay is connected to the second stationary contact.

[0032] In one of the technical solutions, the motor drive circuit also includes a second capacitor located between the moving contacts of different relays.

[0033] In this technical solution, a second capacitor is provided to absorb the surge or voltage fluctuations across the second capacitor after the relay is activated, thereby improving the stability of power supply to the motor.

[0034] In the above technical solution, the value of the second capacitor is selected according to the actual application scenario, and is not limited here.

[0035] In one of the technical solutions, the motor drive circuit also includes a fourth resistor, located between the moving contacts of different relays.

[0036] In this technical solution, a fourth resistor is set so that it can be used in conjunction with the second capacitor to dissipate the electrical energy absorbed by the second capacitor, thus preventing excessive electrical energy from accumulating on the second capacitor and affecting the normal operation of the motor.

[0037] In one of the technical solutions, the fourth resistor is composed of multiple resistors. By adopting the above technical solution, it can be obtained by using combinations of resistors with commonly used resistance values, thereby reducing the selection cost of the fourth resistor.

[0038] In one of the technical solutions, the value of the fourth resistor is determined according to the actual application scenario, and its specific value will not be elaborated here.

[0039] One of the technical solutions also includes a power speed control circuit, which includes: a thyristor, the first end of which is used to receive a power supply signal, and the second end of which is connected to a motor drive circuit to control the operating power and / or speed of the motor connected to the motor drive circuit; and a drive circuit connected to the first and third ends of the thyristor, the drive circuit having a third pin, which is connected to a second connection terminal; wherein, when the third pin is grounded, the drive circuit operates normally.

[0040] In this technical solution, a thyristor and a drive circuit are used to control the motor's operating power and / or speed. Since the drive circuit is connected to the second connection terminal, the power speed control circuit's normal operation is controlled by the opening and closing state of the cover. Specifically, when the cover is closed, the cover detection circuit pulls the third pin to ground, allowing the power speed control circuit to meet the conditions for normal operation and thus operate normally.

[0041] During this process, the opening and closing state of the door directly affects whether the power speed regulation circuit operates normally. Therefore, it can reduce the probability of the power speed regulation circuit continuing when the cover is open, thereby improving the safety of motor control.

[0042] In one of the technical solutions, the Silicon Controlled Rectifier (SCR) is a high-power electrical component, also known as a thyristor. It has advantages such as small size, high efficiency, and long lifespan. In automatic control systems, it can be used as a high-power driving device to control high-power equipment with low-power controls. It has been widely used in AC / DC motor speed control systems, power regulation systems, and servo systems.

[0043] Thyristors are classified into two types: unidirectional thyristors and bidirectional thyristors. A bidirectional thyristor, also called a three-terminal bidirectional thyristor, is abbreviated as TRIAC. Structurally, a bidirectional thyristor is equivalent to two unidirectional thyristors connected in reverse, and this type of thyristor has bidirectional conduction capability. Its on / off state is determined by the control electrode. Applying a positive pulse (or negative pulse) to the control electrode will turn it on in the forward (or reverse) direction. The advantage of this device is its simple control circuit and the absence of reverse withstand voltage issues, making it particularly suitable for use as an AC contactless switch, which is not limited in this application.

[0044] In one technical solution, the driving circuit includes: a fifth resistor, the first end of which is connected to the first end of the thyristor; a sixth resistor, the first end of which is connected to the third end of the thyristor and the second end of the fifth resistor; and a second switch, the first end of which is connected to the second end of the sixth resistor, and the second end of the second switch is the third pin; wherein, when the cover is in the open state, the cover detection circuit pulls the third pin to suspend it, and when the cover is in the closed state, the cover detection circuit pulls the third pin to ground.

[0045] This technical solution provides a detailed scheme for the drive circuit. The opening and closing state of the cover is fed back to the control of the thyristor by a second switching transistor, thereby controlling whether the power speed regulation circuit can operate normally from the perspective of the drive circuit.

[0046] Specifically, by setting the fifth and sixth resistors, the voltage difference between the first and third terminals of the thyristor is expressed in the form of voltage, so that the second switching transistor can control it.

[0047] In one of the technical solutions, the values ​​of the fifth and sixth resistors can be selected according to actual usage requirements, and their specific values ​​will not be elaborated here.

[0048] In one of the technical solutions, the sixth resistor can be obtained by combining two or more resistors in series and / or in parallel.

[0049] In this technical solution, the above design reduces the difficulty of selecting the sixth resistor and also facilitates a reduction in the manufacturing cost of the control circuit. One technical solution also includes a control chip connected to the control terminals of at least two switching devices and a cover detection circuit, used to drive the at least two switching devices to operate according to the opening and closing state of the cover, thereby controlling the rotation direction of the motor.

[0050] In this technical solution, when controlling the rotation direction of the motor, the opening and closing state of the cover is obtained, and the rotation direction of the motor is controlled according to the opening and closing state of the cover. In this process, the adjustment factor of the rotation direction is increased, reducing the probability of adjusting the rotation direction of the motor before the cover is closed, thereby ensuring the reliability of the control circuit operation.

[0051] Specifically, the control chip is used to control the motor drive circuit to stop responding when it detects that the cover is open, such as maintaining the original rotation direction, so as to avoid the situation where the user is pinched when the motor changes the rotation direction.

[0052] In any of the above technical solutions, a control chip is also included, which is connected to the control terminal of the second switching transistor and the cover detection circuit, for controlling the operating power and / or speed of the motor connected to the motor drive circuit based on the opening and closing state of the cover.

[0053] In this technical solution, a power speed regulation circuit is used to control the power and / or speed of the motor, reducing the likelihood of the motor running before the cover is closed, thus ensuring the reliability of the control circuit. Specifically, when the cover is detected to be open, the motor is stopped to prevent injury to the user from being pinched while the motor is running.

[0054] In any of the above technical solutions, a third switch is also included, the control terminal of which is connected to the cover detection circuit, the first terminal of which is grounded, and the second terminal of which is connected to the control chip so that the control chip can determine the opening and closing state of the cover.

[0055] In this technical solution, a third switch is used to connect with the cover detection circuit to obtain the opening and closing state of the cover. In this process, the opening and closing state of the cover is directly obtained by the circuit, which ensures the accuracy of the detection results.

[0056] In any of the above technical solutions, a seventh resistor is also included, located between the control terminal of the third switch and the cover detection circuit.

[0057] In this technical solution, by setting a seventh resistor, the current flowing through the control terminal of the third switching transistor can be limited, thus preventing damage due to excessive current and improving the reliability of the control circuit.

[0058] In one of the technical solutions, one end of the seventh resistor is connected to the control terminal of the third switch, and the other end of the seventh resistor is connected to the connection point.

[0059] In one of the technical solutions, the control chip is specifically used to: acquire the voltage information of the second terminal of the third switching transistor; and determine the opening and closing state of the cover based on the comparison result between the voltage information and the preset voltage information.

[0060] This technical solution provides a detailed method for the control chip to determine the opening and closing state of the cover. By acquiring the voltage information of the second terminal of the third switch, the opening and closing state of the cover can be determined based on the magnitude of the voltage information of the second terminal of the third switch.

[0061] Specifically, when the cover is open, the voltage at the connection point is relatively high. At this time, the third switch is on, meaning its first and second terminals are connected, and the voltage at its second terminal is low. Conversely, when the cover is closed, the voltage at the connection point is relatively low, and the third switch is off, meaning its first and second terminals are not connected, and the voltage at its second terminal is high. By comparing this voltage information with preset voltage information, the voltage level at the second terminal of the third switch can be determined, thus indicating the open or closed state of the cover.

[0062] In the above technical solution, the control chip is also used to output a reminder message when the open / closed state is the open state.

[0063] In this technical solution, by outputting reminder information, the user is informed of the current status of the food processor using the application control circuit, thereby enabling the corresponding processing to be performed.

[0064] In one of the technical solutions, the notification information can take the form of sound, light, or text, or one or more of these.

[0065] In one of the technical solutions, text can be displayed using the display panel of the food processor.

[0066] A second aspect of the present invention is to provide a control circuit comprising: a cover detection circuit for detecting the open / closed state of a cover; a motor drive circuit connected to the cover detection circuit for adjusting the rotation direction of the motor; a power speed control circuit connected to the cover detection circuit and the motor drive circuit; and a control chip connected to the cover detection circuit, the motor drive circuit, and the power speed control circuit for controlling the rotation direction of the motor according to the open / closed state of the cover; and / or controlling the operating power and / or speed of the motor connected to the motor drive circuit according to the open / closed state of the cover.

[0067] In this technical solution, the control circuit includes the cover detection circuit, motor drive circuit, power speed regulation circuit and control chip as described above. The connection relationship between the cover detection circuit, motor drive circuit, power speed regulation circuit and control chip is the same as described above, and will not be repeated here.

[0068] A third aspect of the present invention is to provide a food processor, comprising: a motor; and a control circuit as described in any of the above.

[0069] In the above technical solution, the food processing machine is a noodle machine, which includes a mixing assembly and an extrusion assembly. The mixing assembly includes a mixing chamber with an upper opening, a cover that closes the upper opening of the mixing chamber, and a mixing blade arranged in the mixing chamber. The extrusion assembly includes an extrusion chamber, a screw, and a die. A connecting opening is provided between the mixing chamber and the extrusion chamber. The extrusion chamber has a noodle outlet. The die is installed at the noodle outlet and connected to the screw. A motor is used to drive the mixing blade and the screw to rotate. When the cover is in the open state, the motor drive circuit responds to the received control information. When the cover is in the closed state, the motor drive circuit does not respond to the received control information.

[0070] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0071] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0072] Figure 1 A schematic diagram of the topology of the cover detection circuit in an embodiment of the present invention is shown;

[0073] Figure 2 A schematic diagram of the motor drive circuit topology in an embodiment of the present invention is shown.

[0074] in, Figure 1 and Figure 2 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0075] 100 Motor drive circuit, 102 First connection terminal, 200 Cover detection circuit, 202 Second connection terminal, 204 First power supply, 300 Power speed regulation circuit, 302 Third terminal, 400 Control chip, Q1 First switching transistor, H detection switch, C1 First capacitor, R1 First resistor, R2 Second resistor, R3 Third resistor, REL relay, Q2 Switching device, C2 Second capacitor, C3 Third capacitor, R4 Fourth resistor, SCR thyristor, R5 Fifth resistor, R6 Sixth resistor, Q3 Second switching transistor, Q4 Third switching transistor, R7 Seventh resistor, C4 Fourth capacitor, R8 Eighth resistor. Detailed Implementation

[0076] To better understand the above aspects, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0077] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0078] In one embodiment, such as Figure 1 and Figure 2 As shown, a control circuit is proposed, including: a motor drive circuit 100 having a first connection terminal 102, wherein the motor drive circuit 100 operates normally when the first connection terminal 102 is grounded; and a cover detection circuit 200 for detecting the opening and closing state of the cover, having a second connection terminal 202, wherein the first connection terminal 102 is connected to the second connection terminal 202; wherein, when the cover is in the open state, the cover detection circuit 200 pulls the first connection terminal 102 to suspend it, and when the cover is in the closed state, the cover detection circuit 200 pulls the first connection terminal 102 to ground.

[0079] This application proposes a control circuit, which includes a motor drive circuit 100 for controlling the operation of a motor and a cover detection circuit 200 for detecting the opening and closing state of a cover. Since the cover detection circuit 200 is connected to the first connection terminal 102 of the motor drive circuit 100, the opening and closing state of the cover is fed back to the motor drive circuit 100. For example, when the cover is in the open state, the cover detection circuit 200 pulls the first connection terminal 102 to suspend it, so that the motor drive circuit 100 cannot operate normally. Conversely, when the cover is in the closed state, the cover detection circuit 200 pulls the first connection terminal 102 to ground, so that the motor drive circuit 100 meets the conditions for normal operation and thus operates normally.

[0080] During this process, the opening and closing state of the door directly affects whether the motor drive circuit 100 operates normally. Therefore, it can reduce the probability of the motor drive circuit 100 controlling the motor to run when the cover is open, thereby improving the safety of motor control.

[0081] Furthermore, in the above embodiments, the motor is controlled by utilizing the connection between the cover detection circuit 200 and the motor drive circuit 100. This process involves using weak current detection and controlling strong current based on the weak current detection results, thus ensuring the safety and compliance of motor control.

[0082] In the above embodiment, the cover detection circuit 200 includes: a first switch Q1, the first end of the first switch Q1 being the second connection terminal 202, and the second end of the first switch Q1 being grounded; a first power supply 204; and a detection switch H, having a first pin and a second pin, the first pin being connected to the control terminal of the first power supply 204 and the first switch Q1, and the second pin being grounded; wherein, when the cover is in the open state, the first pin and the second pin are not connected, the first end and the second end of the first switch Q1 are disconnected, and the first connection terminal 102 is suspended; when the cover is in the closed state, the first pin and the second pin are connected, the first end and the second end of the first switch Q1 are connected, and the first connection terminal 102 is grounded.

[0083] In this embodiment, the open and closed states of the cover can be characterized by the state of the detection switch H. Specifically, when the cover is in the open state, the first pin and the second pin are not connected; conversely, when the cover is in the closed state, the first pin and the second pin are connected. Therefore, the open and closed state of the cover can be known by whether the first pin and the second pin of the detection switch H are connected, thereby realizing the acquisition of the open and closed state of the cover.

[0084] The first power supply 204 transmits an electrical signal to the first switch Q1 to detect whether the first and second pins of the switch H are connected, thereby switching the state of the first connection terminal 102 by controlling the operation of the first switch Q1. Specifically, when the first and second pins of the first switch Q1 are disconnected, the second connection terminal 202 is not grounded through the first switch Q1, and therefore, the first connection terminal 102 connected to the second connection terminal 202 is suspended. Conversely, when the first and second pins of the first switch Q1 are connected, the second connection terminal 202 is grounded through the first switch Q1, and therefore, the first connection terminal 102 connected to the second connection terminal 202 is also grounded.

[0085] In the above embodiment, the opening and closing state of the cover is obtained and converted into an electrical signal that can be recognized by the circuit components by setting the first switch Q1, the first power supply 204 and the detection switch H, thereby realizing the control of the suspension and grounding of the first connection terminal 102. In this process, the circuit structure for controlling the suspension and grounding of the first connection terminal 102 is simple and inexpensive, ensuring the reliability of the control circuit.

[0086] In the above embodiment, there is a connection point between the first terminal, the first power supply 204 and the control terminal of the first switching transistor Q1. The cover detection circuit 200 also includes: a first capacitor C1, the first end of the first capacitor C1 is connected to the connection point, and the second end of the first capacitor C1 is connected to the second terminal.

[0087] In this embodiment, a first capacitor C1 is provided to limit the response speed of the first switch Q1. Specifically, when the cover is open, the first power supply 204 charges the first capacitor C1. As charging proceeds, the voltage across the first capacitor C1 continuously increases until it can no longer increase. Conversely, when the cover is closed, since the first and second pins of the detection switch H are connected, the first capacitor C1 forms a circuit with the grounding point through the detection switch H. At this time, the electrical energy stored in the first capacitor C1 is continuously released, and the voltage across the first capacitor C1 continuously decreases. When the voltage drops to the level that satisfies the turn-on voltage of the first switch Q1, the first and second pins of the first switch Q1 are connected. At this time, the first connection terminal 102 of the motor drive circuit 100 is grounded.

[0088] During the above process, the charging and discharging of the first capacitor C1 requires a certain amount of time, which can be used as a delay time for the control circuit to avoid the motor drive circuit 100 frequently switching between normal and abnormal operation states, thereby improving the reliability of the control circuit operation.

[0089] In the above embodiment, there is a connection point between the first terminal, the first power supply 204 and the control terminal of the first switch Q1. The cover detection circuit 200 also includes a first resistor R1, located between the control terminal of the first switch Q1 and the connection point.

[0090] In this embodiment, by setting a first resistor R1, the current flowing through the control terminal of the first switching transistor Q1 is limited, thereby avoiding the possibility of the first switching transistor Q1 being damaged due to overcurrent during actual use, thus improving the reliability of the control circuit operation.

[0091] In the above embodiment, there is a connection point between the first terminal, the first power supply 204 and the control terminal of the first switching transistor Q1. The cover detection circuit 200 also includes a second resistor R2, located between the first power supply 204 and the connection point.

[0092] In this embodiment, by limiting the setting of the second resistor R2, the voltage at the connection point can be reasonably set using the second resistor R2, thereby reducing the probability of safety risks that may occur in the actual use of the control circuit due to excessive voltage at the connection point.

[0093] Furthermore, when the first capacitor C1 and the second resistor R2 are both present, the first resistor R1 limits the charging current of the first power supply 204 when charging the first capacitor C1, so as to avoid the first power supply 204 and / or the first capacitor C1 from malfunctioning due to excessive charging current during the charging process. It is understood that the second resistor R2 can reduce the charging current of the first capacitor C1 when charging, thus ensuring the stability of the control circuit during operation.

[0094] In one embodiment, the value of the second resistor R2 can be determined according to the actual application scenario, and its specific value is not limited here.

[0095] In the above embodiment, there is a connection point between the first pin, the first power supply 204 and the control terminal of the first switching transistor Q1. The cover detection circuit 200 also includes a third resistor R3, located between the connection point and the first pin.

[0096] In this embodiment, a third resistor R3 is provided to limit the current flowing through the detection switch H, preventing the detection switch H from malfunctioning due to excessive current when the first and second pins of the detection switch H are connected. It is understood that the third resistor R3 can reduce the current flowing through the detection switch H during operation, ensuring the stability of the control circuit.

[0097] In addition, when the cover is closed, the third resistor R3 is used to accelerate the release of electrical energy in the first capacitor C1, thereby improving the overall response speed of the control circuit and enhancing the user experience of the control circuit.

[0098] In one embodiment, the motor drive circuit 100 includes: at least two power supply lines, each power supply line including two sub-terminals; at least two relays REL, corresponding one-to-one with the at least two power supply lines, each relay REL including a first stationary contact, a second stationary contact and a moving contact, the first stationary contact and the second stationary contact being connected to the corresponding two sub-terminals respectively, and the moving contact being used to connect to the motor; at least two switching devices Q2, corresponding one-to-one with the relays REL, the first end of each switching device Q2 being connected to the corresponding relay REL, the second end of each switching device Q2 being a first connection terminal 102, and each switching device Q2 being used to control the corresponding relay REL to switch the connection state of the moving contact with the first stationary contact and the second stationary contact, so as to switch the rotation direction of the motor.

[0099] In this embodiment, a specific structure of the motor drive circuit 100 is given. Specifically, by defining the included power supply lines, and each power supply line including two sub-terminals, the forward and reverse rotation of the motor can be controlled by utilizing the connection state of the moving contact with the first stationary contact and the second stationary contact after the relay REL is connected to the sub-terminals.

[0100] Specifically, in one possible embodiment, when the switching device Q2 is turned on, the moving contact of the relay REL is connected to the first stationary contact, and when the switching device Q2 is turned off, the moving contact of the relay REL is connected to the second stationary contact.

[0101] Specifically, in one possible embodiment, when the switching device Q2 is off, the moving contact of the relay REL is connected to the first stationary contact, and when the switching device Q2 is on, the moving contact of the relay REL is connected to the second stationary contact.

[0102] In one embodiment, a rectifier circuit BD is further included. The output of the rectifier circuit BD is connected to at least two power supply lines for outputting DC power to at least two power supply lines. The rectifier circuit BD is used to receive AC power and convert AC power into DC power.

[0103] In one embodiment, the motor drive circuit 100 further includes a second capacitor C2 located between the moving contacts of different relays REL.

[0104] In this embodiment, a second capacitor C2 is provided to absorb the surge formed across the second capacitor C2 after the relay REL is activated, or to absorb the voltage fluctuations across the two capacitors, thereby improving the stability of power supply to the motor.

[0105] In the above embodiments, the value of the second capacitor C2 is selected according to the actual use scenario, and is not limited here.

[0106] In one embodiment, the motor drive circuit 100 further includes a fourth resistor R4 located between the moving contacts of different relays REL.

[0107] In this embodiment, a fourth resistor R4 is provided so that it can be used in conjunction with the second capacitor C2 to dissipate the electrical energy absorbed by the second capacitor C2, thereby preventing excessive electrical energy from accumulating on the second capacitor C2 and affecting the normal operation of the motor.

[0108] In one embodiment, the fourth resistor R4 is composed of multiple resistors. By adopting the above embodiment, it can be obtained by using a combination of resistors with commonly used resistance values, thereby reducing the selection cost of the fourth resistor R4.

[0109] In one embodiment, the value of the fourth resistor R4 is determined according to the actual application scenario, and its specific value will not be described in detail here.

[0110] In one embodiment, a power speed control circuit 300 is also included. The power speed control circuit 300 includes: a silicon controlled rectifier (SCR), the first terminal of which is used to receive a power supply signal, and the second terminal of which is connected to the motor drive circuit 100 for controlling the operating power and / or speed of the motor connected to the motor drive circuit 100; and a drive circuit connected to the first and third terminals of the SCR. The drive circuit has a third pin 302, which is connected to the second connection terminal 202. The drive circuit operates normally when the third pin 302 is grounded.

[0111] In this embodiment, a silicon controlled rectifier (SCR) and a drive circuit are configured to control the motor's operating power and / or speed using the SCR. Since the drive circuit is connected to the second connection terminal 202, the power speed control circuit 300 can operate normally under the control of the cover's opening and closing state. Specifically, when the cover is closed, the cover detection circuit 200 pulls the third pin 302 to suspend it, preventing the power speed control circuit 300 from operating normally. Conversely, when the cover is closed, the cover detection circuit 200 pulls the third pin 302 to ground, allowing the power speed control circuit 300 to meet the conditions for normal operation and thus operate normally.

[0112] During this process, the opening and closing state of the door directly affects whether the power speed regulation circuit 300 operates normally. Therefore, it can reduce the probability of the power speed regulation circuit 300 continuing to operate when the cover is open, thereby improving the safety of motor control.

[0113] In one embodiment, a Silicon Controlled Rectifier (SCR) is a high-power electrical component, also known as a thyristor. It has advantages such as small size, high efficiency, and long lifespan. In automatic control systems, it can be used as a high-power driving device to control high-power equipment with low-power controls. It is widely used in AC / DC motor speed control systems, power regulation systems, and servo systems.

[0114] Thyristor SCRs are classified into two types: unidirectional thyristor SCRs and bidirectional thyristor SCRs. A bidirectional thyristor SCR, also called a three-terminal bidirectional thyristor SCR, is abbreviated as TRIAC. Structurally, a bidirectional thyristor SCR is equivalent to two unidirectional thyristor SCRs connected in reverse, and this type of thyristor SCR has bidirectional conduction capability. Its on / off state is determined by the control electrode. Applying a positive pulse (or negative pulse) to the control electrode will turn it on in the forward (or reverse) direction. The advantage of this device is its simple control circuit and the absence of reverse withstand voltage issues, making it particularly suitable for use as an AC contactless switch, which is not limited in this application.

[0115] In one embodiment, the driving circuit includes: a fifth resistor R5, the first end of which is connected to the first end of the silicon controlled rectifier (SCR); a sixth resistor R6, the first end of which is connected to the third end of the SCR and the second end of the fifth resistor R5; a second switch Q3, the first end of which is connected to the second end of the sixth resistor R6, and the second end of the second switch Q3 is a third pin 302; wherein, when the cover is in the open state, the cover detection circuit 200 pulls the third pin 302 to suspend it, and when the cover is in the closed state, the cover detection circuit 200 pulls the third pin 302 to ground.

[0116] In this embodiment, a detailed scheme for the drive circuit is given. The opening and closing state of the cover is fed back to the control of the SCR by the second switch Q3, thereby controlling whether the power speed regulation circuit 300 can operate normally from the perspective of the drive circuit.

[0117] Specifically, by setting the fifth resistor R5 and the sixth resistor R6, the voltage difference between the first and third terminals of the thyristor SCR is expressed in the form of voltage, so that the second switching transistor Q3 can be controlled.

[0118] In one embodiment, the values ​​of the fifth resistor R5 and the sixth resistor R6 can be selected according to actual usage needs, and their specific values ​​will not be described in detail here.

[0119] In one embodiment, the sixth resistor R6 may be obtained by combining two or more resistors in series and / or in parallel.

[0120] In this embodiment, the above design can reduce the difficulty of selecting the sixth resistor R6, and at the same time, it can also help reduce the manufacturing cost of the control circuit.

[0121] In one embodiment, it further includes: a control chip 400, connected to the control terminals of at least two switching devices Q2 and the cover detection circuit 200, for driving at least two switching devices Q2 to operate according to the opening and closing state of the cover, and controlling the rotation direction of the motor.

[0122] In this embodiment, when controlling the rotation direction of the motor, the opening and closing state of the cover is obtained, and the rotation direction of the motor is controlled according to the opening and closing state of the cover. In this process, the adjustment factor of the rotation direction is increased, reducing the probability of adjusting the rotation direction of the motor before the cover is closed, thereby ensuring the reliability of the control circuit operation.

[0123] Specifically, the control chip 400 is used to control the motor drive circuit 100 to stop responding when it detects that the cover is in an open state, so as to avoid the situation where the user is pinched when the motor changes the rotation direction.

[0124] In any of the above embodiments, a control chip 400 is further included, which is connected to the control terminal of the second switch Q3 and the cover detection circuit 200, for controlling the operating power and / or speed of the motor connected to the motor drive circuit 100 based on the opening and closing state of the cover.

[0125] In this embodiment, the power and / or speed of the motor are controlled by the power speed regulation circuit 300, which reduces the probability of the motor running before the cover is closed, thereby ensuring the reliability of the control circuit operation.

[0126] Specifically, when the cover is detected to be open, the motor is controlled to stop running in order to prevent the user from being pinched while the motor is running.

[0127] In any of the above embodiments, a third switch Q4 is further included. The control terminal of the third switch Q4 is connected to the cover detection circuit 200. The first terminal of the third switch Q4 is grounded, and the second terminal of the third switch Q4 is connected to the control chip 400 so that the control chip 400 can determine the opening and closing state of the cover.

[0128] In this embodiment, a third switch Q4 is used to connect to the cover detection circuit 200, thereby obtaining the opening and closing state of the cover. In this process, the opening and closing state of the cover is directly obtained by the circuit, ensuring the accuracy of the detection results.

[0129] In any of the above embodiments, a seventh resistor R7 is also included, located between the control terminal of the third switch Q4 and the cover detection circuit 200.

[0130] In this embodiment, by setting a seventh resistor R7, the current flowing through the control terminal of the third switch Q4 is limited, thus preventing damage due to excessive current and improving the reliability of the control circuit.

[0131] In one embodiment, one end of the seventh resistor R7 is connected to the control terminal of the third switch Q4, and the other end of the seventh resistor R7 is connected to the connection point.

[0132] In one embodiment, the control chip 400 is specifically used to: acquire voltage information at the second terminal of the third switch Q4; and determine the opening and closing state of the cover based on the comparison result between the voltage information and preset voltage information.

[0133] In this embodiment, a detailed scheme for the control chip 400 to determine the opening and closing state of the cover is given. The opening and closing state of the cover is determined by obtaining the voltage information of the second terminal of the third switch Q4.

[0134] Specifically, when the cover is open, the voltage at the connection point is relatively high. At this time, the third switch Q4 is turned on, meaning its first and second terminals are connected, and the voltage at its second terminal is low. Conversely, when the cover is closed, the voltage at the connection point is relatively low, and the third switch Q4 is turned off, meaning its first and second terminals are not connected, and the voltage at its second terminal is high. By comparing this voltage information with preset voltage information, the voltage level at the second terminal of the third switch Q4 can be determined, thus indicating the open or closed state of the cover.

[0135] In the above embodiment, the control chip 400 is also used to output a reminder message when the open / closed state is the open state.

[0136] In this embodiment, a reminder message is output so that the user is aware of the current status of the food processor controlled by the application control circuit, thereby enabling the corresponding processing to be performed.

[0137] In one embodiment, the reminder message may take the form of one or more of sound, light, and text.

[0138] In one embodiment, text can be displayed using the display panel of the food processor.

[0139] In any of the above embodiments, the system further includes: a third capacitor C3, the first end of which is connected to the first end of the silicon controlled rectifier (SCR); and an eighth resistor R8, the first end of which is connected to the second end of the third capacitor C3, and the second end of which is connected to the second end of the SCR.

[0140] In this embodiment, by setting a third capacitor C3 and an eighth resistor R8, the combined use of the third capacitor C3 and the eighth resistor R8 can eliminate voltage fluctuations that may occur during the operation of the SCR, thereby improving the stability of the food processor during operation.

[0141] In one embodiment, a fourth capacitor C4 is also included, with its first terminal connected to the first terminal of the second switch Q3 and its second terminal connected to the second terminal of the second switch Q3.

[0142] In one embodiment, 1, RE1, and RE2 are the drive signals for two relays REL, and MC is the drive signal for a silicon controlled rectifier (SCR). H is a magnetic switch. When the cover is closed, pins 1 and 3 of H are connected. When the cover is opened, pins 1 and 3 of H are disconnected.

[0143] 2. When the noodle machine lid is closed, pins 1 and 3 of H are connected. As capacitor C1 discharges, the voltage of HG1 gradually decreases, eventually approaching 0V. The voltage at the first connection terminal 102 also decreases to 0V. If the main chip detects that pin HG1 is below 1.2V, it determines that the lid is closed and can proceed with normal noodle machine operation and motor control.

[0144] 3. When the noodle machine lid is removed, pins 1 and 3 of H are disconnected. As capacitor C1 charges, the voltage at pin B of Q1 and Q4 gradually increases to nearly 5V, and the voltage at the first connection terminal 102 also gradually increases to nearly 5V. The main chip detects that pin HG1 is above or equal to 1.2V and determines that the lid is open. The software then disables the MC, RE1, and RE2 drivers, and the machine interface displays a lid-open notification to the user. Simultaneously, the voltage at the first connection terminal 102 is close to 5V, meaning that pin E of switching device Q2 is close to 5V. This means that switching devices Q2 and the second switching transistor Q3 will never conduct when the lid is open, effectively forcing the two relays REL and SCR to shut down, meeting safety requirements and improving reliability.

[0145] In one embodiment, a control circuit is provided, comprising: a cover detection circuit 200 for detecting the open / closed state of a cover; a motor drive circuit 100 connected to the cover detection circuit 200 for adjusting the rotation direction of the motor; a power speed control circuit 300 connected to the cover detection circuit 200 and the motor drive circuit 100; and a control chip 400 connected to the cover detection circuit 200, the motor drive circuit 100, and the power speed control circuit 300 for controlling the rotation direction of the motor according to the open / closed state of the cover; and / or controlling the operating power and / or speed of the motor connected to the motor drive circuit 100 according to the open / closed state of the cover.

[0146] In this embodiment, the control circuit includes a cover detection circuit 200, a motor drive circuit 100, a power speed regulation circuit 300, and a control chip 400 as described above. The connection relationship between the cover detection circuit 200, the motor drive circuit 100, the power speed regulation circuit 300, and the control chip 400 is consistent with that described above, and will not be repeated here.

[0147] In one embodiment, a food processor is provided, including: a motor; and a control circuit as described above.

[0148] In the above embodiment, the food processing machine is a noodle machine, which includes a mixing assembly and an extrusion assembly. The mixing assembly includes a mixing chamber with an upper opening, a cover that closes the upper opening of the mixing chamber, and a mixing blade arranged in the mixing chamber. The extrusion assembly includes an extrusion chamber, a screw, and a die. A connecting opening is provided between the mixing chamber and the extrusion chamber. The extrusion chamber has a noodle outlet. The die is installed at the noodle outlet and connected to the screw. A motor is used to drive the mixing blade and the screw to rotate. When the cover is in the open state, the motor drive circuit 100 responds to the received control information. When the cover is in the closed state, the motor drive circuit 100 does not respond to the received control information.

[0149] In the description of this invention, the term "a plurality of" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. The terms "connection," "installation," "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0150] In the description of this invention, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this invention, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0151] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control circuit, characterized in that, include: The motor drive circuit has a first connection terminal. When the first connection terminal is grounded, the motor drive circuit operates normally. A cover detection circuit for detecting the open / closed state of a cover has a second connection terminal, wherein the first connection terminal is connected to the second connection terminal. When the cover is in the open state, the cover detection circuit pulls the first connection terminal to suspend it; when the cover is in the closed state, the cover detection circuit pulls the first connection terminal to ground. The control circuit also includes a power speed regulation circuit, which includes: A thyristor, wherein the first terminal of the thyristor is used to receive a power supply signal, and the second terminal of the thyristor is connected to the motor drive circuit for controlling the operating power and / or speed of the motor connected to the motor drive circuit; A driving circuit is connected to the first and third terminals of the thyristor, and the driving circuit has a third pin, which is connected to the second connection terminal. When the third pin is grounded, the drive circuit operates normally; when the third pin is suspended, the power speed control circuit cannot operate normally. The driving circuit includes: The fifth resistor, the first end of which is connected to the first end of the thyristor; The sixth resistor has its first end connected to the third end of the thyristor and the second end of the fifth resistor. The second switch has its first terminal connected to the second terminal of the sixth resistor, and the second terminal of the second switch is the third terminal; the second switch feeds back the opening and closing state of the cover to the thyristor. Specifically, when the cover is in the open state, the cover detection circuit pulls the third pin to suspend it; when the cover is in the closed state, the cover detection circuit pulls the third pin to ground.

2. The control circuit according to claim 1, characterized in that, The cover detection circuit includes: The first switching transistor has a first terminal that is the second connection terminal and a second terminal that is grounded. First power source; The detection switch has a first pin and a second pin. The first pin is connected to the control terminal of the first power supply and the first switching transistor, and the second pin is grounded. When the cover is in the open state, the first end and the second end are not connected, the first end and the second end of the first switch tube are disconnected, and the first connection end is suspended. When the cover is in the closed state, the first end and the second end are connected, the first end and the second end of the first switch tube are connected, and the first connection end is grounded.

3. The control circuit according to claim 2, characterized in that, The first pin, the first power supply, and the control terminal of the first switching transistor have a connection point, and the cover detection circuit further includes: A first capacitor, wherein a first end of the first capacitor is connected to the connection point, and a second end of the first capacitor is connected to the second terminal; The first resistor is located between the control terminal of the first switching transistor and the connection point; A second resistor is located between the first power source and the connection point; and / or The third resistor is located between the connection point and the first pin.

4. The control circuit according to any one of claims 1 to 3, characterized in that, The motor drive circuit includes: At least two power supply lines, each power supply line including two sub-terminals; At least two relays are provided, each corresponding to at least two power supply lines. Each relay includes a first stationary contact, a second stationary contact, and a moving contact. The first stationary contact and the second stationary contact are respectively connected to the corresponding two sub-terminals, and the moving contact is used to connect to the motor. At least two switching devices are provided, each corresponding to a relay. The first end of each switching device is connected to the corresponding relay, and the second end of each switching device is the first connection end. Each switching device is used to control the corresponding relay to switch the connection state of the moving contact with the first stationary contact and the second stationary contact, so as to switch the rotation direction of the motor.

5. The control circuit according to claim 4, characterized in that, The motor drive circuit also includes: A second capacitor is located between the moving contacts of different relays; and / or The fourth resistor is located between the moving contacts of the different relays.

6. The control circuit according to claim 4, characterized in that, Also includes: A control chip is connected to the control terminals of the at least two switching devices and the cover detection circuit, and is used to drive the at least two switching devices to operate according to the opening and closing state of the cover, thereby controlling the rotation direction of the motor.

7. The control circuit according to claim 1, characterized in that, Also includes: A control chip, connected to the control terminal of the second switching transistor and the cover detection circuit, is used to control the operating power and / or speed of the motor connected to the motor drive circuit based on the opening and closing state of the cover.

8. The control circuit according to claim 6, characterized in that, Also includes: The third switch is connected to the control terminal of the cover detection circuit. The first terminal of the third switch is grounded, and the second terminal of the third switch is connected to the control chip so that the control chip can determine the opening and closing state of the cover.

9. The control circuit according to claim 8, characterized in that, Also includes: The seventh resistor is located between the control terminal of the third switch and the cover detection circuit.

10. The control circuit according to claim 8, characterized in that, The control chip is specifically used for: Obtain the voltage information at the second terminal of the third switch transistor; The opening / closing state of the cover is determined based on the comparison result between the voltage information and the preset voltage information.

11. A control circuit, characterized in that, include: The cover detection circuit is used to detect the open / closed state of the cover; A motor drive circuit, connected to the cover detection circuit, is used to adjust the rotation direction of the motor; A power speed regulation circuit is connected to the cover detection circuit and the motor drive circuit; A control chip, connected to the cover detection circuit, the motor drive circuit, and the power speed regulation circuit, is used to control the rotation direction of the motor according to the opening and closing state of the cover; and / or The operating power and / or speed of the motor connected to the motor drive circuit are controlled according to the opening and closing state of the cover.

12. A food processing machine, characterized in that, include: Electric motor; The control circuit as described in any one of claims 1 to 11.

13. The food processing machine according to claim 12, characterized in that, The food processing machine is a noodle machine, which includes a mixing component and an extrusion component; The stirring assembly includes a stirring chamber with an upper opening, a cover that covers the upper opening of the stirring chamber, and a stirring blade arranged inside the stirring chamber. The extrusion assembly includes an extrusion cavity, a screw, and a die head. A communication opening is provided between the mixing cavity and the extrusion cavity. The extrusion cavity is provided with an outlet. The die head is installed at the outlet and connected to the screw. The motor is used to drive the mixing blade and the screw to rotate. When the cover is in the open state, the motor drive circuit responds to the received control information; when the cover is in the closed state, the motor drive circuit does not respond to the received control information.

Images