CN109044226B

CN109044226B - Door switch circuit and washing appliance

Info

Publication number: CN109044226B
Application number: CN201810573667.9A
Authority: CN
Inventors: 雷振雄; 杨展华; 高鹏; 徐金平; 郭焕京
Original assignee: Midea Group Co Ltd; Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Priority date: 2018-06-06
Filing date: 2018-06-06
Publication date: 2020-12-22
Anticipated expiration: 2038-06-06
Also published as: CN109044226A

Abstract

The invention discloses a door switch circuit and a washing appliance. The washing appliance includes a washing pump, an input unit, and an output unit. The door switch circuit includes: a door switch and a control switch. One end of the door switch is connected with a direct current power supply. The input end of the control switch is connected with the other end of the door switch, the first output end of the control switch is connected with the power supply loop of the washing pump, and the door switch is used for responding to the door opening or closing action of the washing electric appliance so as to disconnect or connect the control switch to cut off the power supply loop of the washing pump when the washing electric appliance opens the door. According to the door switch circuit and the washing electric appliance, one end of the door switch is connected with the direct-current power supply, the other end of the door switch is connected to the weak current control loop of the control switch to control the power supply loop of the washing pump, the door switch is used for cutting off the weak current control loop of the control switch when the washing electric appliance is opened, the washing pump is forcibly disconnected, the washing pump stops working, and the safety of the washing electric appliance is improved.

Description

Door switch circuit and washing appliance

Technical Field

The invention relates to household appliances, in particular to a door switch circuit and a washing appliance.

Background

By the basin is usually arranged in to basin, the door body also is control panel, and control panel is last to be provided with the touch key and supplies the user to operate, need heat and spray water in the course of the work, and when the door body was opened, the power of washing pump needed to be cut off, however, basin formula dish washer door body structure is special, and the break-make of washing pump power can't be controlled to the installation micro-gap switch, and the security is relatively poor.

Disclosure of Invention

The embodiment of the invention provides a door switch circuit and a washing appliance.

The control method of the embodiment of the invention is used for washing an electric appliance, the electric appliance comprises a washing pump, an input unit and an output unit, and the door switch circuit comprises:

one end of the door switch is connected with a direct current power supply; and

the input end of the control switch is connected with the other end of the door switch, the first output end of the control switch is connected with the power supply loop of the washing pump, and the door switch is used for responding to the door opening or closing action of the washing electric appliance so as to disconnect or connect the control switch to cut off the power supply loop of the washing pump when the washing electric appliance opens the door.

In some embodiments, the door switch circuit further comprises: the input end of the detection circuit is connected with the second output end of the control switch, and the detection circuit is used for detecting the door opening or closing action of the washing electric appliance according to the state of the door switch; and

the input end of the controller is connected with the output end of the detection circuit, the output end of the controller is connected with the input unit and the output unit, and the controller is used for controlling the input unit and the output unit according to the door opening or closing action detected by the detection circuit.

In some embodiments, the detection circuit comprises:

the anode of the diode is the input end of the detection circuit;

one end of the first resistor is connected with the cathode of the diode;

one end of the second resistor is connected with the other end of the first resistor;

one end of the third resistor is connected with the other end of the second resistor;

a base electrode of the triode is connected with the other end of the third resistor, an emitting electrode of the triode is grounded, and a collector electrode of the triode is connected with an output end of the detection circuit and an input end of the controller;

and one end of the fourth resistor is connected with the collector of the triode, and the other end of the fourth resistor is connected with a preset power supply.

In some embodiments, the detection circuit further comprises:

one end of the fifth resistor is connected with one end of the third resistor, and the other end of the fifth resistor is connected with an emitting electrode of the triode;

a first capacitor connected in parallel with the fifth resistor.

In some embodiments, the detection circuit further comprises:

the second capacitor is connected between the other end of the fourth resistor and the ground;

and one end of the third capacitor is connected with the collector of the triode, and the other end of the third capacitor is connected with the emitter of the triode.

In certain embodiments, the control switch comprises a relay.

In some embodiments, the input unit is configured to receive a user input, and the controller is configured to execute a command corresponding to the user input when the washing appliance is closed.

In some embodiments, the controller is further configured to stop execution of the instruction corresponding to the user input when the washing appliance is opened.

In some embodiments, the output unit comprises a buzzer, and the controller is further configured to control the buzzer to sound every predetermined time to remind a user when the washing appliance opens the door.

The washing appliance of the embodiment of the invention comprises the door switch circuit.

According to the door switch circuit and the washing electric appliance, one end of the door switch is connected with the direct-current power supply, the other end of the door switch is connected to the weak current control loop of the control switch to control the power supply loop of the washing pump, and the door switch is used for cutting off the weak current control loop of the control switch when the washing electric appliance is opened to realize forced disconnection of the washing pump, so that the washing pump stops working, and the safety of the washing electric appliance is improved.

Advantages of additional aspects 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.

Drawings

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

fig. 1 is a block diagram of a door switch circuit according to an embodiment of the present invention.

Fig. 2 is a schematic block diagram of a washing appliance according to an embodiment of the present invention.

FIG. 3 is a circuit schematic of a door switch circuit according to some embodiments of the present invention.

FIG. 4 is a circuit schematic of a door switch circuit according to some embodiments of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for the purpose of illustrating the embodiments of the present invention and are not to be construed as limiting the embodiments of the present invention.

The door switch circuit for a washing appliance and the washing appliance according to the embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to fig. 1 and 2, a washing appliance 1000 according to an embodiment of the present invention includes a washing pump 200, an input unit 300, and an output unit 400. The washing appliance may be a sump dishwasher.

With the concern of people about tableware hygiene, washing appliances such as dish washers are becoming increasingly popular, wherein the water tank type dish washer is gradually favored by users because the water tank type dish washer can be directly installed in the water tank, has a small size, does not occupy additional space, and does not need to change a water path or a circuit. The door body of the water tank type dish washing machine is opened along the vertical direction so that a user can place tableware to be washed, and the door body is closed after the tableware is placed. The door body also comprises a control panel, and the control panel usually comprises a solid key or a touch key for a user to input an instruction to control the dishwasher to wash. It is understood that a dishwasher, as a device requiring heating and water spraying, requires forcibly turning off power of a washing pump when a door is opened, thereby preventing hot water from causing injury to a user. The water tank type dish washer has high waterproof requirement due to the special structure of the door body, and cannot install the traditional micro-door switch, so that the problem of high safety becomes urgent to be solved.

The door switch circuit 100 according to the embodiment of the present invention includes a door switch 10 and a control switch 20.

One end of door switch 10 is connected to a dc power supply, the other end of door switch 10 is connected to an input terminal of control switch 20, and a first output terminal a of control switch 20 is connected to a power supply circuit of washing pump 200. The door switch 10 is used to respond to the door opening or closing operation of the washing appliance 1000, that is, the door switch 10 is turned off when the door is opened, that is, the door opening operation, and the door switch 20 is turned on when the door is closed, that is, the door closing operation. The control switch 20 is turned off in synchronization with the operation of the door switch 10, that is, the door switch 10 is turned off, the control switch 20 is turned off, the door switch 10 is connected, and the control switch 10 is connected. And the first output terminal a of the control switch 20 is connected to the power supply circuit of the washing pump 200, when the control switch 20 is turned off, the power supply circuit of the washing pump 200 is turned off, the washing pump 200 stops operating, and when the control switch 200 is connected, the washing pump 200 operates. That is, when the washing appliance 1000 opens the door, the door switch 10 is in the off state, the control switch 20 cuts off the power supply circuit of the washing pump 200, and the washing pump 200 stops operating, thereby realizing the forced disconnection. When the washing appliance 1000 is closed, the door switch 20 is in a connected state, the control switch 20 is connected, the power supply circuit of the washing pump 200 supplies power normally, and whether the washing pump 200 works or not can be controlled by a command of the controller of the washing appliance 1000.

In summary, one end of the door switch 10 is connected to the dc power supply, and the other end is connected to the weak current control circuit of the control switch 20 to control the power supply circuit of the washing pump 200, and the door switch 10 is used to cut off the weak current control circuit of the control switch 20 when the washing appliance is opened, so as to forcibly turn off the washing pump 200, stop the washing pump 200, and improve the safety of the washing appliance 1000.

In some embodiments, the door switch 10 may be a proximity switch and the control switch 20 may be a relay that controls the power circuit of the wash pump 200 by opening and closing its movable and stationary contacts.

Further, in some examples, the control switch 20 may include a plurality of power supply circuits for connecting more loads, such as a regeneration valve, and the like, and the connection manner of the power supply circuits and the on-off principle of the washing pump are substantially the same, and thus the detailed description thereof is omitted.

In some embodiments, the door switch circuit 100 further includes a detection circuit 30 and a controller 40.

Wherein, the input end of the detection circuit 30 is connected with the second output end b of the control switch 20, the output end of the detection circuit 30 is connected with the input end of the controller 40, and the output end of the controller 40 is connected with the input unit 300 and the output unit 400. The detection circuit 30 detects the on/off state of the door switch 10 through the control switch 20 connected to the input terminal, and detects the door opening or closing operation of the washing appliance 1000 according to the state of the door switch 10. The controller 40 controls the input unit 300 and the output unit 400 according to the detected door opening or closing motion.

The controller 40 may be an MCU in the washing appliance 1000.

In some embodiments, the input unit 300 is configured to receive a user input, and the controller 40 is configured to execute a command corresponding to the user input when the washing appliance 1000 is closed.

In such an embodiment, the controller 40 is also configured to stop executing the instruction corresponding to the user input when the washing appliance 1000 opens the door.

Specifically, the input unit 300 includes virtual or physical keys disposed on the door panel, and is configured to receive an input of a user to form a corresponding control command, when the door body is opened, a power supply circuit of a load such as a washing pump is cut off, and meanwhile, the controller 40 controls the corresponding load to stop executing the corresponding command when receiving a corresponding user instruction, so as to ensure safety of the washing appliance 1000 when the door body is opened. When the door body is closed, the controller 40 controls the corresponding load to execute the corresponding command when receiving the corresponding user command.

Further, in some embodiments, the output unit 400 includes a buzzer, and the controller 40 is further configured to control the buzzer to sound every predetermined time to remind the user when the washing appliance 1000 opens the door.

Specifically, in actual operation, the user probably forgets in time to close after opening the door body to cause the damage of washing electrical apparatus 1000, unexpected situations such as foreign matter entering washing cavity of dish washer take place, so, open the back at the door body, cut off the power supply circuit of the load including the washing pump on the one hand, guaranteed safe in utilization, on the other hand, every preset time sends the sound through bee calling organ and reminds the user to be in the state of opening the door, user experience preferred.

Of course, in other examples, the output unit may further include a breathing lamp, a voice broadcast device, and the like, and send out corresponding prompts through these devices to remind the user.

Referring to fig. 3 and 4, in some embodiments, the detection circuit 30 may include a diode D1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a transistor Q1.

The anode of the diode D1 is used as the input terminal of the detection circuit 30, and is connected to the second output terminal b of the control switch 20 through a wire harness. The cathode of the diode D1 is connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the base B of the transistor Q1, the emitter E of the transistor Q1 is grounded, and the collector C is connected to the input of the controller 40 as the output of the detection circuit 30. One end of the fourth resistor R4 is connected to the collector C of the three terminals, and the other end is connected to a predetermined power supply, which may be a +3.3V power supply. The diode D1 is used for rectification. The first resistor R1 and the second resistor R2 play a role in voltage division and current limitation to protect the diode. The third resistor R3 is used for limiting current, so that the base current of the transistor Q1 is allowed to work in an allowable range, and reliable stability of the operation of the transistor Q1 and the detection circuit 30 is ensured. The fourth resistor R4 is a pull-up resistor that provides a certain level to the transistor Q1. Specifically, when the detection circuit 30 is turned on, the predetermined power supply provides a high level to turn on the transistor Q1.

In some embodiments, the detection circuit 30 further includes a fifth resistor R5 and a first capacitor C1.

One end of the fifth resistor R5 is connected to one end of the third resistor R3, and the other end of the fifth resistor R5 is connected to the emitter E of the transistor Q1. The first capacitor C1 is connected in parallel with the fifth resistor R5. The fifth resistor R5 is a pull-down resistor, which pulls down the voltage of the base B of the triode Q1, reduces interference and ensures that the triode Q1 is not switched on by mistake. The first capacitor C1 connected in parallel is a bypass capacitor of the emitter of the transistor Q1.

In some embodiments, the detection circuit 30 further includes a second capacitor C2 and a third capacitor C3. The second capacitor C2 is connected between the other end of the fourth resistor R4 and ground. One end of the third capacitor C3 is connected to the collector C of the transistor Q1, and the other end is connected to the emitter E of the transistor Q1.

Therefore, when the door body is closed, the detection circuit 30 is conducted, the triode Q1 is conducted, and the controller 40 can obtain a signal of closing the door, so as to control the load to execute corresponding operation. When the door body is opened, the detection circuit 30 is disconnected, and the controller 40 obtains a door opening signal, so that the loads are controlled to suspend to execute corresponding operations, and the electricity utilization safety of the washing electric appliance 1000 is ensured.

In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the embodiments of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the embodiments of the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. Specific meanings of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific situations.

In embodiments of the invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or the first and second features being in contact, not directly, but via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The above disclosure provides many different embodiments or examples for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the invention, specific example components and arrangements are described above. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, embodiments of the invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, embodiments of the present invention provide examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the description herein, references to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processing module-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of embodiments of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. A door switch circuit for a washing appliance, the washing appliance including a washing pump, an input unit and an output unit, the door switch circuit comprising:

one end of the door switch is connected with a direct current power supply;

the input end of the control switch is connected with the other end of the door switch, the first output end of the control switch is connected with the power supply loop of the washing pump, the door switch is used for responding to the door opening or closing action of the washing electric appliance so as to disconnect or connect the control switch to cut off the power supply loop of the washing pump when the washing electric appliance opens the door, the control switch comprises a relay, and two ends of a coil of the relay are respectively connected with the door switch and the ground end;

the input end of the detection circuit is connected with the second output end of the control switch, and the detection circuit is used for detecting the door opening or closing action of the washing electric appliance according to the state of the door switch;

the input end of the controller is connected with the output end of the detection circuit, the output end of the controller is connected with the input unit and the output unit, the controller is used for controlling the input unit and the output unit according to the door opening or closing action detected by the detection circuit, and when the detection circuit detects the door opening action, the controller controls the washing electric appliance to stop executing the instruction received by the input unit.

2. The door switch circuit of claim 1 wherein the detection circuit comprises:

the anode of the diode is the input end of the detection circuit;

one end of the first resistor is connected with the cathode of the diode;

3. The door switch circuit of claim 2 wherein the detection circuit further comprises:

a first capacitor connected in parallel with the fifth resistor.

4. The door switch circuit of claim 3 wherein the detection circuit further comprises:

5. The door switch circuit of claim 1, wherein the input unit is configured to receive a user input, and the controller is configured to execute a command corresponding to the user input when the washing appliance is closed.

6. The door switch circuit of claim 5, wherein the controller is further configured to stop execution of the command corresponding to the user input when the washing appliance is opened.

7. The door switch circuit as claimed in claim 6, wherein the output unit includes a buzzer, and the controller is further configured to control the buzzer to sound every predetermined time to alert a user when the washer appliance is opened.

8. A washing appliance, characterized in that it comprises a door switch circuit according to any one of claims 1 to 7.