CN211657994U - Food processor and control circuit thereof - Google Patents
Food processor and control circuit thereof Download PDFInfo
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- CN211657994U CN211657994U CN201921843085.4U CN201921843085U CN211657994U CN 211657994 U CN211657994 U CN 211657994U CN 201921843085 U CN201921843085 U CN 201921843085U CN 211657994 U CN211657994 U CN 211657994U
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Abstract
The application discloses cooking machine and control circuit thereof. The control circuit includes: a microswitch; the detection circuit is connected with the microswitch so as to generate at least two paths of corresponding detection signals according to the current switch state of the microswitch; and the control chip is connected with the detection circuit to receive the at least two detection signals and judge the current switch state of the microswitch according to the at least two detection signals so as to control the food processor to work. Through this kind of mode, can improve cooking machine's control accuracy, and accord with the ann rule requirement.
Description
Technical Field
The application relates to the technical field of electric appliances, in particular to a food processor and a control circuit thereof.
Background
With the improvement of living standard, people pay more and more attention to health, so more and more users choose to use the cooking machine to make food by oneself. In order to avoid the injury to the user, when the cooking cup of the cooking machine is separated from the base, the cooking machine can be controlled to stop working.
The inventor of this application discovers at long-term research and development in-process, among the prior art, adopts micro-gap switch to detect whether arrange the cup breaks away from the base usually to adopt control chip to produce control signal according to micro-gap switch's on off state, with control cooking machine stop work, but control signal often can receive the interference and lead to controlling wrong, and this kind of control is not conform to the safety regulation requirement.
SUMMERY OF THE UTILITY MODEL
The main technical problem who solves of this application is how to improve cooking machine's control accuracy, and makes cooking machine accord with the ann rule requirement.
In order to solve the technical problem, the application adopts a technical scheme that: a control circuit of a food processor is provided. The control circuit includes: a microswitch; the detection circuit is connected with the microswitch so as to generate at least two paths of corresponding detection signals according to the current switch state of the microswitch; and the control chip is connected with the detection circuit to receive the at least two detection signals and judge the current switch state of the microswitch according to the at least two detection signals so as to control the food processor to work.
In a specific embodiment, the control chip comprises a first input/output port and a second input/output port which are respectively connected with the detection circuit and receive a first detection signal and a second detection signal generated by the detection circuit so as to judge the current switch state of the microswitch according to the first detection signal and the second detection signal; wherein the logic levels of the first detection signal and the second detection signal are mutually exclusive.
In one embodiment, the detection circuit includes: the detection node is connected with the microswitch and is in a corresponding logic level according to the current switch state of the microswitch; the first detection unit is connected with the detection node and outputs a first detection signal according to the logic level of the detection node, wherein the logic level of the first detection signal is consistent with the logic level of the detection node; and a second detection unit connected to the detection node and outputting a second detection signal according to a logic level of the detection node, wherein the logic level of the second detection signal is opposite to the logic level of the detection node.
In one embodiment, the detection node is connected to the power signal through a first resistor.
In one embodiment, the first detection unit includes: the detection circuit comprises a second resistor and a first capacitor, wherein one end of the second resistor is connected with a detection node, the other end of the second resistor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded; and the connection node between the second resistor and the first capacitor is used as the output end of the first detection unit and is connected to the first input/output port of the control chip.
In one embodiment, the second detection unit includes: the control end of the switch tube is connected with the detection node, the first path end of the switch tube is connected to a power supply signal through the third resistor, and the second path end of the switch tube is grounded; one end of the second capacitor is connected to a connection node between the first path end of the switch tube and the third resistor, and the other end of the second capacitor is grounded; and the connection node between the second capacitor and the first path end and the third resistor of the switching tube is used as the output end of the second detection unit and is connected to the second input/output port of the control chip.
In a specific embodiment, the second detecting unit further includes: and the control end of the switching tube is connected to the detection node through the fourth resistor.
In one embodiment, the micro-switch includes a contact, a first terminal and a second terminal, wherein the first terminal is connected to ground, the second terminal is connected to a detection node of the detection circuit to output a current switch state of the micro-switch, and the contact is disposed between the first terminal and the second terminal to turn on or off the connection between the first terminal and the second terminal to switch the micro-switch between the switch states.
In one embodiment, the distance between the first terminal and the second terminal meets a preset safety specification; or the micro switch further comprises a third terminal arranged between the first terminal and the second terminal, and the third terminal is connected to the power signal.
In order to solve the above technical problem, another technical solution adopted by the present application is: a food processor is provided. This cooking machine includes: base, cooking cup and above-mentioned control circuit, control circuit set up in the base, and control circuit detects whether cooking cup is placed on the base to control cooking machine work.
The beneficial effect of this application is: be different from prior art, the control circuit of cooking machine of this application embodiment includes: a microswitch; the detection circuit is connected with the microswitch so as to generate at least two paths of corresponding detection signals according to the current switch state of the microswitch; and the control chip is connected with the detection circuit to receive the at least two detection signals and judge the current switch state of the microswitch according to the at least two detection signals so as to control the food processor to work. The control circuit of cooking machine of this application embodiment passes through detection circuit and produces two at least way detection signal according to micro-gap switch's current on off state to judge micro-gap switch's current on off state according to these two at least way detection signal through control chip, can avoid certain way detection signal error to appear and lead to micro-gap switch's on off state detection error, thereby lead to cooking machine maloperation's problem, and control chip acquires multichannel detection signal, accords with the ann's rule requirement that the chip detected. Therefore, the control accuracy of the food processor can be improved, and the safety requirements are met.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of a food processor of the present application;
fig. 2 is a schematic structural diagram of an embodiment of a control circuit of the food processor of the present application;
FIG. 3 is a schematic circuit diagram of the control circuit of the embodiment of FIG. 2;
fig. 4 is a schematic circuit structure diagram of another embodiment of the control circuit of the food processor of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be noted that the following examples are only illustrative of the present application, and do not limit the scope of the present application. Likewise, the following examples are only some examples and not all examples of the present application, and all other examples obtained by a person of ordinary skill in the art without any inventive step are within the scope of the present application.
The present application firstly provides a food processor, as shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of the food processor of the present application. The food processer 10 of the embodiment comprises a base 20, a food processing cup 30 and a control circuit 40, wherein the control circuit 40 is arranged on the base 20, and the control circuit 40 detects whether the food processing cup 30 is placed on the base 20 or not and controls the food processer 10 to work according to the placement state of the food processing cup 30.
Further, the food processor 10 further includes a motor (not shown), the motor is disposed on the base 20, and when the control circuit 40 detects that the food processing cup 30 is placed on the base 20, the motor is controlled to operate, so as to process the food in the food processing cup 30; the control circuit 40 detects that the cooking cup 30 leaves from the base 20, namely when the cup is lifted, the motor is controlled to stop working, so as to avoid injury to users and save power consumption.
The food processor 10 of the present embodiment may be a wall breaking machine, a cooking machine, etc.
The present application further provides a control circuit of a food processor, as shown in fig. 2, fig. 2 is a schematic structural diagram of an embodiment of the control circuit of the food processor of the present application. The control circuit 40 of the present embodiment can be used for the food processor 10 of the above embodiment, and the control circuit 40 includes: the micro-switch 410, the detection circuit 420 and the control chip 430, wherein the detection circuit 420 is connected with the micro-switch 410 to generate at least two corresponding detection signals according to the current switch state of the micro-switch 410; the control chip 430 is connected to the detection circuit 420 to receive the at least two detection signals of the detection circuit 420, and determine the current on-off state of the microswitch 410 according to the at least two detection signals, so as to control the food processor 10 to operate.
Specifically, when the cooking cup 30 is placed on the base 20, the microswitch 410 is triggered by the pressure exerted on the base 20 by the cooking cup 30, so that the microswitch 410 is in a closed state; when the cooking cup 30 leaves the base 20, the pressure applied on the base 20 is released, and the micro switch 410 returns to the off state; the detection circuit 420 generates at least two corresponding detection signals according to the current switch state of the micro switch 410, for example, the detection circuit 420 generates a detection signal "0, 1" when the micro switch 410 is in the off state, and generates a detection signal "1, 0" when the micro switch 410 is in the off state, and so on; the control chip 430 controls the food processor 10 to be in different working states according to different detection signals, for example, the control chip 430 controls the motor of the food processor 10 to rotate according to the detection signal "0, 1", the control chip 430 controls the motor of the food processor 10 to stop rotating according to the detection signal "1, 0", and so on.
Alternatively, as shown in fig. 3, fig. 3 is a schematic circuit structure diagram of the control circuit in the embodiment of fig. 2. The control chip 430 of the embodiment includes a first input/output port I/O1 and a second input/output port I/O2, the first input/output port I/O1 is connected to the detection circuit 420 and receives the first detection signal WD1 generated by the detection circuit 420, and the second input/output port I/O2 is connected to the detection circuit 420 and receives the second detection signal WD2 generated by the detection circuit 420; the control chip 430 determines the on-off state of the micro switch 410 according to the first detection signal WD1 and the second detection signal WD 2; wherein, the logic levels of the first detection signal WD1 and the second detection signal WD2 are mutually exclusive.
In the safety requirements of chip detection, it is necessary to perform an abnormal test on the first input/output port I/O1 and the second input/output port I/O2 of the control chip 430 at full high level (i.e., "1, 1") or full low level (i.e., "0, 0"), and in this embodiment, in order to avoid the problem that the first detection signal WD1 and the second detection signal WD2 are repeated with an abnormal detection signal and thus the detection accuracy is reduced, the logic levels of the first detection signal WD1 and the second detection signal WD2 are required to be mutually exclusive, such as "0, 1" or "1, 0".
The detection circuit 420 of this embodiment generates two mutually exclusive detection signals of logic level according to the switch state of the microswitch 410, and performs detection through two first input/output ports of the control chip 430, so that the safety requirement of chip detection can be met.
Optionally, the detection circuit 420 of this embodiment includes: a detection node 421, a first detection unit 422, and a second detection unit 423; the detection node 421 is connected to the micro switch 410 and is at a corresponding logic level according to the current switch state of the micro switch 410; the first detecting unit 422 is connected to the detecting node 421 and outputs a first detecting signal WD1 according to a logic level of the detecting node 421, wherein the logic level of the first detecting signal WD1 is consistent with the logic level of the detecting node 421; the second sensing unit 423 is connected to the sensing node 421 and outputs the second sensing signal WD2 according to a logic level of the sensing node 421, wherein the logic level of the second sensing signal WD2 is opposite to the logic level of the sensing node 421.
Optionally, the micro switch 410 of the present embodiment includes a contact W, a first terminal 1 and a second terminal 3, wherein the first terminal 1 is grounded, the second terminal 3 is connected to the detection node 421 of the detection circuit 420 to output the current switch state of the micro switch 410, and the contact W is disposed between the first terminal 1 and the second terminal 3 to turn on or off the connection between the first terminal 1 and the second terminal 3 to switch the micro switch 410 between the switch states.
Specifically, when the cooking cup 30 is placed on the base 20, due to the pressure of the cooking cup 30 on the base 20, two ends of the contact piece W are respectively connected to the first terminal 1 and the second terminal 3 to conduct the first terminal 1 and the second terminal 3, so that the micro switch 410 is turned off, and at this time, the logic level of the detection node 421 is pulled to a low level through the first terminal 1 and the second terminal 3; when the cooking cup 30 leaves the base 20, the pressure applied to the base 20 is released, and the contact W is disconnected from the first terminal 1 and the second terminal 3 to disconnect the first terminal 1 and the second terminal 3, so that the micro switch 410 is turned off, and at this time, the logic level of the detection node 421 is restored to the original level.
Optionally, the micro switch 410 of the present embodiment further includes a third terminal 2, the third terminal 2 is disposed between the first terminal 1 and the second terminal 3, and the third terminal 2 is connected to the power signal.
In this embodiment, the third terminal 2 is connected to the power signal, so that the short circuit between the first terminal 1 and the second terminal 3 can be avoided to cause the detection node 421 to be always grounded, thereby causing the problem that the on-off state of the micro switch 410 cannot be accurately detected.
In another embodiment, to avoid short circuit between the first terminal and the second terminal, the distance between the first terminal and the second terminal may be set to meet a preset safety specification. For example, the distance may be greater than or equal to 1.8 mm; if a third terminal is provided between the first terminal and the second terminal, the third terminal may be suspended.
The contact W is usually disposed at the bottom of the cooking cup 30 or on the upper surface of the base 20, and is not usually integrated into a circuit board (not shown), so as to facilitate maintenance of the contact W, the micro-switch 410 of the embodiment further includes a first seat CN1 and a second seat CN2, the first seat CN1 includes a first terminal 1, a second terminal 3, and a third terminal 2, the second seat CN2 includes a fourth terminal 1 ', a fifth terminal 3', and a sixth terminal 2 ', wherein the first seat CN1 is connected to the second seat CN2 in a plugging manner, the first terminal 1 is correspondingly connected to the fourth terminal 1', the second terminal 3 is correspondingly connected to the fifth terminal 3 ', and the third terminal 2 is correspondingly connected to the sixth terminal 2'.
Of course, in other embodiments, the contact pads may also be provided directly corresponding to the first and second terminals, as shown in fig. 4.
Alternatively, as can be seen from the above analysis, when the micro switch 410 is turned off, the logic level of the detection node 421 is pulled to a low level, and in order to improve the detection accuracy of the switch state of the micro switch 410, the detection node 421 of this embodiment is connected to a power signal (not shown) through the first resistor R1, so as to pull the logic level of the detection node 421 to a high level when the micro switch 410 is in the off state.
Optionally, the first detecting unit 422 of this embodiment includes: a second resistor R2 and a first capacitor C1, wherein one end of the second resistor R2 is connected to the detection node 421, the other end is connected to one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded; and a connection node between the second resistor R2 and the first capacitor C1, which is connected to the first input/output port I/O1 of the control chip 430, serves as an output terminal of the first sensing unit 422.
The second detection unit 423 of the present embodiment includes: a switch tube Q1 and a second capacitor C2, a control terminal B of the switch tube Q1 is connected to the detection node 421, a first path terminal C of the switch tube Q1 is connected to a power signal (not shown) through a third resistor R3, and a second path terminal E of the switch tube Q1 is grounded; one end of a second capacitor C2, one end of a second capacitor C2 is connected to a connection node between the first path end C of the switching tube Q1 and the third resistor R3, and the other end of the second capacitor C2 is grounded; wherein, a connection node between the second capacitor C2, the first path terminal C of the switching tube Q1, and the third resistor R3, which is connected to the second input/output port I/O2 of the control chip 430, serves as an output terminal of the second detection unit 423.
The present embodiment implements the inversion of the logic level of the detection node 421 through the switching tube Q1, so as to implement the mutual exclusion of the logic levels of the first detection signal of the first detection unit 422 and the second detection signal of the second detection unit 423.
The switching tube Q1 of the present embodiment is an NPN type transistor, and in other embodiments, an element capable of realizing signal inversion, such as a PNP type transistor and a MOS transistor, may also be used instead of the switching tube Q1 of the present embodiment.
Optionally, the second detecting unit 423 of this embodiment further includes: a fourth resistor R4, wherein the control terminal B of the switch Q1 is connected to the detection node 421 through the fourth resistor R4.
The third resistor R3 acts similar to the first resistor R1, so that the logic level of the detection node 421 is pulled high when the micro switch 410 is in the off state.
The voltage of the power supply signal may be +5V, or may be +4V or + 6V.
The resistor can adopt a variable resistor to facilitate circuit adjustment.
Of course, in other embodiments that do not require compliance with the above chip anomaly detection safety, a structure similar to the first detection unit 422 may be employed in place of the second detection unit 423 to implement two detection signals.
In this embodiment, when the food processing cup 30 is placed on the base 20, the micro switch 410 is turned off, the first terminal 1 is communicated with the second terminal 3, the voltage of the detection node 421 is pulled down to GND, and the first detection signal WD1 is directly pulled down to GND; and the switch Q1 is not conducting, so that the second detection signal WD2 is pulled up to + 5V. Therefore, when the microswitch 410 is turned off, the first detection signal WD1 and the second detection signal WD2 are "0" and "1", respectively.
When the cooking cup 30 leaves the base 20, the micro switch 410 is turned off, the first terminal 1 is disconnected from the second terminal 3, the voltage of the detection node 421 is pulled up to +5V, and the first detection signal WD1 is directly pulled up to + 5V; and the switch Q1 is in saturation conduction, so that the second detection signal WD2 is pulled down to GND. Therefore, when the microswitch 410 is turned off, the first detection signal WD1 and the second detection signal WD2 are "1" and "0", respectively.
When the cooking cup 30 leaves the base 20, except for the micro switch 410 being turned off, the first detection signal WD1 and the second detection signal WD2 cannot be "1" or "0" when a single device in the control circuit 40 fails to be short-circuited; and the short circuit between the first terminal 1 and the second terminal 3 and the short circuit between the second terminal 3 and the third terminal 2 can not occur the situation that the first detection signal WD1 and the second detection signal WD2 are respectively '1' and '0', which accords with the safety regulation requirement.
The level signal of the detection node 421 is divided into two paths, one path is to output the first detection signal WD1 to the first input/output port I/O1 of the control chip 430 in the forward direction, the other path is to output the second detection signal WD2 to the second input/output port I/O2 of the control chip 430 in the reverse direction through the switching tube Q1, the logic levels of the first detection signal WD1 and the second detection signal WD2 are mutually exclusive, and the abnormal test of the chip detection can be satisfied.
Be different from prior art, the control circuit of cooking machine of this application embodiment includes: a microswitch; the detection circuit is connected with the microswitch so as to generate at least two paths of corresponding detection signals according to the current switch state of the microswitch; and the control chip is connected with the detection circuit to receive the at least two detection signals and judge the current switch state of the microswitch according to the at least two detection signals so as to control the food processor to work. The control circuit of cooking machine of this application embodiment passes through detection circuit and produces two at least way detection signal according to micro-gap switch's current on off state to judge micro-gap switch's current on off state according to these two at least way detection signal through control chip, can avoid certain way detection signal error to appear and lead to micro-gap switch's on off state detection error, thereby lead to cooking machine maloperation's problem, and control chip acquires multichannel detection signal, accords with the ann's rule requirement that the chip detected. Therefore, the control accuracy of the food processor can be improved, and the safety requirements are met.
Further, when this application embodiment cooking machine's cooking cup breaks away from the base, adopt weak current control scheme only to break off the motor, and need not to adopt the power supply of forceful electric power scheme with whole control circuit, not only can practice thrift the cost, for example the module such as display screen need not to go up the power-on and restart moreover, and user experience is high.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A control circuit of a food processor, the control circuit comprising:
a microswitch;
the detection circuit is connected with the microswitch so as to generate at least two corresponding detection signals according to the current switch state of the microswitch;
and the control chip is connected with the detection circuit to receive the at least two detection signals and judge the current switch state of the microswitch according to the at least two detection signals so as to control the food processor to work.
2. The control circuit of claim 1, wherein the control chip comprises a first input/output port and a second input/output port, which are respectively connected to the detection circuit and receive a first detection signal and a second detection signal generated by the detection circuit, so as to determine the current switch state of the microswitch according to the first detection signal and the second detection signal;
wherein the logic levels of the first detection signal and the second detection signal are mutually exclusive.
3. The control circuit of claim 2, wherein the detection circuit comprises:
the detection node is connected with the microswitch and is in a corresponding logic level according to the current switch state of the microswitch;
a first detection unit connected to the detection node and outputting the first detection signal according to a logic level of the detection node, wherein the logic level of the first detection signal is identical to the logic level of the detection node;
and a second detection unit connected to the detection node and outputting the second detection signal according to a logic level of the detection node, wherein the logic level of the second detection signal is opposite to the logic level of the detection node.
4. The control circuit of claim 3, wherein the sense node is coupled to the power signal through a first resistor.
5. The control circuit according to claim 4, wherein the first detection unit includes: the detection circuit comprises a first capacitor, a second resistor and a first resistor, wherein one end of the second resistor is connected with the detection node, the other end of the second resistor is connected with one end of the first capacitor, and the other end of the first capacitor is grounded; and a connection node between the second resistor and the first capacitor is used as an output end of the first detection unit and connected to the first input/output port of the control chip.
6. The control circuit according to claim 4, wherein the second detection unit includes:
a control end of the switching tube is connected with the detection node, a first path end of the switching tube is connected to the power supply signal through a third resistor, and a second path end of the switching tube is grounded;
a second capacitor, one end of which is connected to the connection node between the first path end of the switch tube and the third resistor, and the other end of which is grounded;
and a connection node among the second capacitor, the first pass end of the switch tube and the third resistor is used as an output end of the second detection unit and is connected to a second input/output port of the control chip.
7. The control circuit of claim 6, wherein the second detection unit further comprises:
and the control end of the switching tube is connected to the detection node through the fourth resistor.
8. The control circuit of claim 3, wherein the micro-switch includes a contact, a first terminal, and a second terminal, wherein the first terminal is coupled to ground, wherein the second terminal is coupled to the sense node of the sense circuit to output a current switch state of the micro-switch, and wherein the contact is disposed between the first terminal and the second terminal to turn on or off the coupling between the first terminal and the second terminal to switch the micro-switch between switch states.
9. The control circuit of claim 8, wherein the distance between the first terminal and the second terminal meets a preset safety specification; or
The micro switch also comprises a third terminal which is arranged between the first terminal and the second terminal and is connected to a power supply signal.
10. The utility model provides a cooking machine which characterized in that, cooking machine includes: base, cooking cup and claim 1 to 9 any one the control circuit, control circuit set up in the base, control circuit detects whether cooking cup places on the base, in order to control cooking machine work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843085.4U CN211657994U (en) | 2019-10-29 | 2019-10-29 | Food processor and control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921843085.4U CN211657994U (en) | 2019-10-29 | 2019-10-29 | Food processor and control circuit thereof |
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| Publication Number | Publication Date |
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| CN211657994U true CN211657994U (en) | 2020-10-13 |
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| CN201921843085.4U Active CN211657994U (en) | 2019-10-29 | 2019-10-29 | Food processor and control circuit thereof |
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| CN (1) | CN211657994U (en) |
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