Food processor control circuit and food processor

Abstract

The utility model relates to the field of household appliances, and discloses a food processor control circuit and a food processor. The food processor control circuit comprises an alternating current power supply input port, a direct current power supply output port, a rectifier bridge circuit, a switch element connected with the alternating current power supply input port and the rectifier bridge circuit, a detection circuit connected between the switch element and the rectifier bridge circuit and a control chip connected with the detection circuit, and the control chip is used for being connected with a driving motor. The detection circuit comprises a main line port arranged between the switch element and the rectifier bridge circuit and a signal port connected with the control chip, and the main line port and the signal port are connected through a photoelectric coupler; and the control chip is used for controlling the driving motor to stop running when the pulse width of the pulse signal output by the signal port exceeds a preset pulse width range. Compared with the prior art, the food processor control circuit and the food processor provided by the embodiment of the utility model have the advantage that the safety can be improved.

Description

Technical Field

[0001] The utility model relates to the field of household appliances, and in particular to a food processor control circuit and a food processor. Background Art

[0002] In daily life, food processors such as wall breakers and soymilk machines are equipped with motors. In order to improve the safety performance of these household appliances equipped with motors, it is necessary to ensure that the motors of these household appliances equipped with motors do not rotate when the user operates them. One implementation method in the related art is to set a weak current switch in the wall breaker circuit, detect the user operation of these household appliances equipped with motors through the weak current switch, and then start / turn off the motor according to the detected user operation. In this way, when the weak current switch detects a fault, the motor cannot be effectively stopped, and there is a safety hazard. Another way is to add a switch element that switches on and off with the user's operation in the main circuit. When the user operates the appliance, the switch element is disconnected, causing the motor to be powered off and stop running. In this way, after the switch is disconnected, the voltage on the DC bus will drop rapidly, but the motor does not stop running, which is easy to cause damage to the back-end circuit. Utility Model Content

[0003] The utility model aims to provide a food processor control circuit and a food processor, which can improve the safety of the food processor.

[0004] In the first aspect, an embodiment of the present application provides a food processor control circuit, comprising: an AC power input port, a DC power output port, a rectifier bridge circuit connecting the AC power input port and the DC power output port, a switching element connecting the AC power input port and the rectifier bridge circuit, a detection circuit connected between the switching element and the rectifier bridge circuit, and a control chip connected to the detection circuit, wherein the control chip is used to connect a drive motor; the detection circuit comprises a main line port arranged between the switching element and the rectifier bridge circuit and a signal port connected to the control chip, wherein the main line port and the signal port are connected via a photocoupler; the control chip is used to control the drive motor to stop running when the pulse width of the pulse signal output by the signal port exceeds a preset pulse width range.

[0005] Compared with the prior art, in the food processor control circuit provided in the embodiment of the present application, a detection circuit is set in the high-voltage main circuit to detect the opening and closing state of the switch element, and the motor is turned off when the switch element is detected to be disconnected. Compared with the low-voltage detection, the high-voltage detection has higher accuracy, thereby reducing the safety problems caused by false detection and improving the safety performance of the food processor. In addition, when the switch element is detected to be disconnected, the motor is turned off in time, thereby reducing the damage to the back-end circuit caused by the motor that is still in operation when the switch in the main circuit is disconnected.

[0006] In an optional embodiment, the food processor control circuit further includes: a frequency conversion circuit and an electrolytic capacitor disposed between the DC power supply output port and the rectifier bridge circuit. The frequency conversion circuit and the electrolytic capacitor can be provided to control the motor more accurately, and the motor can be turned off more promptly when the switch element is detected to be disconnected, thereby further improving safety performance.

[0007] In an optional embodiment, the food processor control circuit further includes: a current limiting resistor arranged between the main line port and the rectifier bridge circuit, and a short-circuit switch element connected in parallel with the current limiting resistor; the control chip is used to control the drive motor to start running when the pulse width of the pulse signal output from the signal port belongs to the preset pulse width range, and control the short-circuit switch element to be disconnected, and the control chip is used to control the short-circuit switch element to be closed after a preset time. The current limiting resistor is set to reduce the main circuit current at startup to protect the main circuit, and the short-circuit switch element is set to short-circuit the current limiting resistor after a preset time, at which time the main circuit current has stabilized, and the short-circuit current limiting resistor can reduce the total power consumption of the circuit.

[0008] In an optional embodiment, the short-circuit switch element is a relay or a thyristor.

[0009] In an optional embodiment, the capacitance value of the electrolytic capacitor is greater than or equal to 220 microfarads and less than or equal to 470 microfarads, and the preset pulse width range is greater than or equal to 8 milliseconds and less than or equal to 12 milliseconds.

[0010] In an optional embodiment, the AC power input port includes a live port and a neutral port, and the switch element and the detection circuit are connected between the live port and the rectifier bridge circuit. The switch element and the detection circuit are connected between the live port and the rectifier bridge circuit, so that the switch element can cut off the power to the main circuit more timely, and the detection circuit can also detect the opening and closing state of the switch element more timely.

[0011] In an optional embodiment, the detection circuit further includes: a first diode, wherein an anode of the first diode is connected to the main line port, and a cathode of the first diode is connected to an anode of the photocoupler.

[0012] In an optional embodiment, the detection circuit also includes: a first resistor, a first capacitor, and a power supply port; the first resistor and the first capacitor are connected in series between the collector pin and the emitter pin of the photocoupler, the signal port is connected between the first resistor and the first capacitor, and the power supply port is connected between the first resistor and the emitter pin.

[0013] In a second aspect, an embodiment of the present application further provides a food processor, comprising: a food processor control circuit as described above and a drive motor connected to the food processor control circuit.

[0014] In an optional embodiment, the food processor includes a body and a cover body disposed on the body, the cover body is connected to a switch element of the food processor control circuit, the switch element is disconnected when the cover body is opened, and the switch element is closed when the cover body is closed. The cover body is connected to the switch element, the switch element is disconnected when the cover body is opened, and the switch element is closed when the cover body is closed, so that the motor can be turned off when the cover body is opened, and the motor can be turned on when the cover body is closed, thereby improving the safety of the food processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a structural schematic diagram of a food processor control circuit provided in Embodiment 1 of the present application;

[0017] Figure 2 A schematic diagram of the waveform of the alternating current input to the AC power input port;

[0018] Figure 3 It is a waveform diagram of the pulse signal output by the signal port when the switch element is closed;

[0019] Figure 4 A structural schematic diagram of a food processor control circuit provided by an embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of the structure of a food processor provided in the second embodiment of the present application;

[0021] Figure 6 This is a schematic diagram of a food processor provided in the second embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Generally, the components of the embodiment of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention but merely represents selected embodiments of the present invention.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0026] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0027] The first embodiment of the utility model provides a food processor control circuit, the food processor includes a driving motor, such as Figure 1 As shown, the food processor control circuit includes: an AC power input port 10, a DC power output port 20, a rectifier bridge circuit 30, a switch element 40, a detection circuit 50, a control chip 60, and a photoelectric coupler 70. The rectifier bridge circuit 30 is arranged between the AC power input port 10 and the DC power output port 20, the switch element 40 is arranged between the AC power input port 10 and the rectifier bridge circuit 30, the detection circuit 50 is arranged between the switch element 40 and the rectifier bridge circuit 30, and the detection circuit 50 is also connected to the control chip 60, and the control chip 60 is used to connect to the drive motor and control the drive motor to turn on and / or off. Further, the detection circuit 50 includes a main line port 51 arranged between the switch element 40 and the rectifier bridge circuit 30 and a signal port 52 connected to the control chip 60, and the main line port 51 and the signal port 52 are connected via the photoelectric coupler 70. The control chip 60 is connected to the signal port 52 and receives the pulse signal outputted from the signal port 52 . When the pulse width of the pulse signal outputted from the signal port 52 exceeds a preset pulse width range, the control chip 60 controls the driving motor to stop running.

[0028] Please refer to Figure 2 and Figure 3 , Figure 2FIG. 1 is a schematic diagram showing the waveform of the AC power input to the AC power input port 10. Figure 3 FIG. 4 is a waveform diagram of the pulse signal output by the signal port 52 when the switch element 40 is closed. Figure 2 , Figure 3 As shown, when the switch element 40 is closed, the AC power input from the AC power input port 10 is input into the detection circuit 50 via the main line port 51. When the AC power is in the positive half cycle, the photocoupler 70 is turned on, and the signal port 52 outputs a low level. When the AC power is in the negative half cycle, the photocoupler 70 is turned off, and the signal port 52 outputs a high level. At this time, the pulse signal output from the signal port 52 is a regular periodic signal, and the pulse width of the pulse signal is related to the period of the AC power. When the switch element 40 is turned off, the AC power input from the AC power input port 10 cannot be input into the detection circuit 50 via the main line port 51, the photocoupler 70 is continuously in the disconnected state, and the signal port 52 continuously outputs a high level. At this time, the pulse signal output from the signal port 52 is a continuous high level signal. In addition, when the switch element 40 is turned off, the pulse signal output from the signal port 52 may also be affected by other high-power electrical equipment in the circuit and fluctuate. Therefore, in actual application, a preset pulse width range can be set according to the cycle of the alternating current. The preset pulse width range is the pulse width of the pulse signal output by the signal port 52 when the switch element is closed. When the switch element 40 is disconnected, regardless of whether it is affected by other high-power electrical equipment in the circuit, the pulse width of the pulse signal output by the signal port 52 will exceed the preset pulse width range. Therefore, the closing and opening of the switch element 40 can be detected according to whether the pulse width of the pulse signal output by the signal port 52 exceeds the preset pulse width range. Therefore, the control chip can be set to control the drive motor to stop running when the pulse width of the pulse signal output by the signal port exceeds the preset pulse width range.

[0029] Compared with the prior art, in the food processor control circuit provided in the embodiment of the present application, a detection circuit is set in the high-voltage main circuit to detect the opening and closing state of the switch element, and the motor is turned off when the switch element is detected to be disconnected. Compared with the low-voltage detection, the high-voltage detection has higher accuracy, thereby reducing the safety problems caused by false detection and improving the safety performance of the food processor. In addition, when the switch element is detected to be disconnected, the motor is turned off in time, thereby reducing the damage to the back-end circuit caused by the motor that is still in operation when the switch in the main circuit is disconnected.

[0030] Further, such as Figure 4As shown, in some other embodiments of the present application, the food processor control circuit may further include: a frequency conversion circuit 80 and an electrolytic capacitor C1 disposed between the DC power supply output port 20 and the rectifier bridge circuit 30. The frequency conversion circuit 80 and the electrolytic capacitor C1 may be provided to control the motor more accurately, and the drive motor may be turned off more timely when the switch element 40 is detected to be disconnected, thereby further improving the safety performance.

[0031] Further, such as Figure 4 As shown, in some other embodiments of the present application, the food processor control circuit may further include: a current limiting resistor R1 disposed between the main line port 51 and the rectifier bridge circuit 30, and a short-circuit switch element 90 connected in parallel with the current limiting resistor R1; the control chip 60 controls the drive motor to start running when the pulse width of the pulse signal output by the signal port 52 belongs to the preset pulse width range, and controls the short-circuit switch element 90 to be disconnected, and the control chip 60 also controls the short-circuit switch element 90 to be closed after a preset time. Setting the current limiting resistor R1 can reduce the main circuit current when the drive motor starts to run, and protect the main circuit. Setting the short-circuit switch element 90 to short-circuit the current limiting resistor R1 after a preset time, the main circuit current has stabilized after the preset time, and the short-circuit current limiting resistor R1 can reduce the total power consumption of the circuit.

[0032] Specifically, in some embodiments of the present application, Figure 4 As shown, the short-circuit switch element 90 may be a relay. Alternatively, in some other embodiments of the present application, the short-circuit switch element 90 may also be a thyristor or other electronic element capable of realizing switch opening / closing, and may be flexibly configured according to actual needs.

[0033] Among them, the preset time can be flexibly set according to the power, model, rated current, rated voltage of the specific drive motor, the specific resistance value of the current limiting resistor R1, the charging characteristics of the electrolytic capacitor and other parameters. For example, the resistance value of the current limiting resistor R1 is 240Ω, and the charging current needs to be limited to 1.5A to protect the electrolytic capacitor and other components. According to the charging characteristics of the electrolytic capacitor, the electrolytic capacitor can be fully charged in about 1.5s, so the preset time can be set to be greater than 1.5s, such as 2s, 2.5s, etc.

[0034] Further, in some embodiments of the present application, the capacitance value of the electrolytic capacitor may be greater than or equal to 220 microfarads and less than or equal to 470 microfarads, and the preset pulse width range may be greater than or equal to 8 milliseconds and less than or equal to 12 milliseconds. When the motor is operated with 50 Hz AC power common in household appliances and 400W common power of the motor, the capacitance value of the electrolytic capacitor may be set to be greater than or equal to 220 microfarads and less than or equal to 470 microfarads, and the main line voltage will drop to a range that damages the back-end circuit within 50ms when the switch is disconnected. When the switch element is in a closed state, the pulse width of the pulse signal output by the signal port 52 is generally greater than or equal to 8 milliseconds and less than or equal to 12 milliseconds, and the disconnection of the switch element can be detected within 20ms, thereby shutting down the motor within 50ms.

[0035] Further, such as Figure 4 As shown, in some embodiments of the present application, the AC power input port 10 includes a live port PL and a neutral port PN, and the switch element 40 and the detection circuit 50 are connected between the live port PL and the rectifier bridge circuit 30. The switch element 40 and the detection circuit 50 are connected between the live port PL and the rectifier bridge circuit 30, so that the switch element 40 can cut off the power to the main circuit more timely, and the detection circuit 50 can also detect the opening and closing state of the switch element 40 more timely.

[0036] Further, such as Figure 4 As shown, the detection circuit 50 may further include: a first diode PN1 , wherein an anode of the first diode PN1 is connected to the main line port 51 , and a cathode of the first diode PN1 is connected to an anode of the photocoupler 70 .

[0037] In addition, if Figure 4 As shown, the detection circuit 50 may also include: a first resistor R2, a first capacitor C2, and a power supply port 53; the first resistor R2 and the first capacitor C2 are connected in series between the collector pin and the emitter pin of the photocoupler 70, the signal port 52 is connected between the first resistor R2 and the first capacitor C2, and the power supply port 53 is connected between the first resistor R2 and the emitter pin of the photocoupler 70.

[0038] The second embodiment of the present invention provides a food cooking machine, such as Figure 5 As shown, the food processor includes a food processor control circuit 101 as provided in the above-mentioned embodiment and a driving motor 102 connected to the food processor control circuit 101 .

[0039] Compared with the prior art, the food processor provided in the second embodiment of the present application includes the food processor control circuit 101 provided in the aforementioned embodiment, and therefore also has the same technical effects as the aforementioned embodiment. For details, please refer to the specific description in the aforementioned embodiment.

[0040] Specifically, Figure 6 As shown, in some other embodiments of the present application, the food processor may include a body 200 and a cover 300 disposed on the body 200, the cover 300 being connected to a switch element in the food processor control circuit 101, the switch element being disconnected when the cover 300 is opened, and the switch element being closed when the cover 300 is closed. The cover 300 is connected to the switch element, the switch element being disconnected when the cover 300 is opened, and the switch element being closed when the cover 300 is closed, so that the motor can be turned off when the cover 300 is opened, and the motor can be turned on when the cover 300 is closed, thereby improving the safety of the food processor.

[0041] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A food processor control circuit, characterized in that: The food processor comprises a driving motor, and the food processor control circuit comprises: An AC power input port, a DC power output port, a rectifier bridge circuit connecting the AC power input port and the DC power output port, a switch element connecting the AC power input port and the rectifier bridge circuit, a detection circuit connected between the switch element and the rectifier bridge circuit, and a control chip connected to the detection circuit, wherein the control chip is used to connect to a drive motor; The detection circuit includes a main line port arranged between the switch element and the rectifier bridge circuit and a signal port connected to the control chip, wherein the main line port and the signal port are connected via a photocoupler; The control chip is used for controlling the driving motor to stop running when the pulse width of the pulse signal outputted by the signal port exceeds a preset pulse width range.

2. The food processor control circuit according to claim 1, characterized in that: The food processor control circuit also includes: A frequency conversion circuit and an electrolytic capacitor are arranged between the DC power supply output port and the rectifier bridge circuit.

3. The food processor control circuit according to claim 2, characterized in that: The food processor control circuit also includes: A current limiting resistor provided between the main line port and the rectifier bridge circuit, and a short-circuit switch element connected in parallel with the current limiting resistor; The control chip is used to control the drive motor to start running when the pulse width of the pulse signal output by the signal port belongs to the preset pulse width range, and control the short-circuit switch element to be disconnected. The control chip is used to control the short-circuit switch element to be closed after a preset time period.

4. The food processor control circuit according to claim 3, characterized in that: The short-circuit switch element is a relay or a thyristor.

5. The food processor control circuit according to claim 2, characterized in that: The capacitance value of the electrolytic capacitor is greater than or equal to 220 microfarads and less than or equal to 470 microfarads, and the preset pulse width range is greater than or equal to 8 milliseconds and less than or equal to 12 milliseconds.

6. The food processor control circuit according to claim 1, characterized in that: The AC power input port includes a live wire port and a neutral wire port, and the switch element and the detection circuit are connected between the live wire port and the rectifier bridge circuit.

7. The food processor control circuit according to claim 1, characterized in that: The detection circuit also includes: A first diode, wherein an anode of the first diode is connected to the main line port, and a cathode of the first diode is connected to an anode of the photocoupler.

8. The food processor control circuit according to claim 1, characterized in that: The detection circuit also includes: A first resistor, a first capacitor, and a power supply port; The first resistor and the first capacitor are connected in series between the collector pin and the emitter pin of the photocoupler, the signal port is connected between the first resistor and the first capacitor, and the power supply port is connected between the first resistor and the emitter pin.

9. A food processor, characterized in that: include: A food processor control circuit as claimed in any one of claims 1 to 8 and a drive motor connected to the food processor control circuit.

10. The food processor according to claim 9, characterized in that The food processor comprises a body and a cover disposed on the body, wherein the cover is connected to a switch element of a control circuit of the food processor, the switch element is disconnected when the cover is opened, and the switch element is closed when the cover is closed.

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