Door opening and closing protection control circuit and dish washing machine

Abstract

The utility model discloses a door switch protection control circuit and a dish-washing machine, the circuit comprises a door switch, a switch control unit, a main control unit and a driving unit, the input end of the door switch is connected to a first power supply for outputting a door signal; a first input end of the switch control unit is connected to a second power supply, and a second input end of the switch control unit is connected with the gate switch and is used for outputting a corresponding first control signal according to the gate signal; the input end of the main control unit is connected with the door switch and is used for outputting a corresponding second control signal according to the door signal; the first input end of the driving unit is connected with the main control unit, the second input end of the driving unit is connected with the switch control unit, the output end of the driving unit is connected with a load, and the driving unit drives the load to be opened or closed according to the first control signal and / or the second control signal; therefore, the mechanical service life of the door switch can be prolonged, the product is stable, and the use safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwashers, in particular to a door switch protection control circuit and a dishwasher. Background Art

[0002] In the related technology, existing commercial dishwashers directly control the power on and off of the main control board load through the door lock switch, which poses a safety hazard. Long-term high-current switching affects the life of the contact points of the door switch, resulting in reduced reliability. In addition, commercial dishwashers are usually used frequently, and the cleaning machine is turned on and off for a long time. There is a possibility of software failure or untimely processing, which may cause high-temperature and high-pressure water to splash onto users. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the purpose of the utility model is to propose a door switch protection control circuit, which can not only extend the mechanical life of the door switch and improve the product stability by adding a switch control unit for hardware control, but also quickly cut off the load through hardware control when the software fails, preventing the washing water pump from splashing high-pressure and high-temperature water to the user.

[0004] The second objective of the present invention is to provide a dishwasher.

[0005] To achieve the above-mentioned purpose, a door switch protection control circuit proposed in an embodiment of the first aspect of the utility model includes: a door switch, wherein the input end of the door switch is connected to a first power supply for outputting a door signal; a switch control unit, wherein the first input end of the switch control unit is connected to a second power supply, the second input end of the switch control unit is connected to the door switch, and the switch control unit is used to output a corresponding first control signal according to the door signal; a main control unit, wherein the input end of the main control unit is connected to the door switch, and the main control unit is used to output a corresponding second control signal according to the door signal; a drive unit, wherein the first input end of the drive unit is connected to the main control unit, the second input end of the drive unit is connected to the switch control unit, the output end of the drive unit is connected to a load, and the drive unit drives the load to turn on or off according to the first control signal and / or the second control signal.

[0006] According to the door switch protection control circuit proposed by the utility model, the input end of the door switch is connected to the first power supply to output a door signal; the first input end of the switch control unit is connected to the second power supply, and the second input end of the switch control unit is connected to the door switch to output a corresponding first control signal according to the door signal; the input end of the main control unit is connected to the door switch to output a corresponding second control signal according to the door signal; the first input end of the drive unit is connected to the main control unit, the second input end of the drive unit is connected to the switch control unit, and the output end of the drive unit is connected to the load, and the drive unit drives the load to turn on or off according to the first control signal and / or the second control signal; thereby, not only can the mechanical life of the door switch be extended and the product stability be improved, but also when the software fails, the load can be quickly cut off through hardware control to prevent the washing water pump from splashing high-pressure and high-temperature water to the user.

[0007] In addition, the door switch protection control circuit proposed in the present invention may also have the following additional technical features:

[0008] Optionally, the switch control unit includes: a first resistor, one end of which is connected to the second power supply; a second resistor, one end of which is connected to one end of the first resistor; a third resistor, one end of which is connected to the other end of the second resistor; a first triode, the collector of which is connected to the other end of the third resistor, the emitter of which is grounded, and the base of which is connected to the other end of the first resistor; a second triode, the collector of which is connected to the base of the first triode, and the emitter of which is grounded; a fourth resistor, one end of which is connected to the base of the second triode, and the other end of which is connected to the gate switch; a MOS tube, the source of which is connected to the second power supply, the drain of which is connected to the driving unit, and the gate of which is connected between the other end of the second resistor and one end of the third resistor.

[0009] Optionally, the MOS tube is a PMOS tube.

[0010] Optionally, the first power supply is a 5V DC power supply, and the second power supply is a 12V DC power supply.

[0011] Optionally, the load includes a washing motor and a water inlet solenoid valve.

[0012] Optionally, the washing motor is connected to the driving unit through a first relay, and the water inlet solenoid valve is connected to the driving unit through a second relay, so that the driving unit drives the washing motor to open or close through the first relay, and the driving unit drives the water inlet solenoid valve to open or close through the second relay.

[0013] To achieve the above object, a second embodiment of the present invention provides a dishwasher, comprising the door switch protection control circuit as described above.

[0014] According to the dishwasher of the embodiment of the utility model, the door switch protection control circuit can not only extend the mechanical life of the door switch and improve product stability, but also quickly cut off the load through hardware control when the software fails, preventing the washing water pump from splashing high-pressure and high-temperature water to the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of a door switch protection control circuit according to an embodiment of the present utility model;

[0016] Figure 2 The figure is a circuit diagram of a door switch protection control circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0019] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] refer to Figure 1 As shown, the door switch protection control circuit proposed in the embodiment of the utility model includes a door switch 10, a switch control unit 20, a main control unit 30 and a drive unit 40.

[0021] Among them, the input end of the door switch 10 is connected to the first power supply for outputting a door signal; the first input end of the switch control unit 20 is connected to the second power supply, the second input end of the switch control unit 20 is connected to the door switch, and the switch control unit 20 is used to output a corresponding first control signal according to the door signal; the input end of the main control unit 30 is connected to the door switch 10, and the main control unit 30 is used to output a corresponding second control signal according to the door signal; the first input end of the drive unit 40 is connected to the main control unit 30, the second input end of the drive unit 40 is connected to the switch control unit 20, and the output end of the drive unit 40 is connected to the load 50, and the drive unit 40 drives the load 50 to turn on or off according to the first control signal and / or the second control signal.

[0022] As an embodiment, the first power supply is a 5V DC power supply, and the second power supply is a 12V DC power supply.

[0023] It should be noted that the main control unit 30 is powered by 5V DC. When the door switch 10 is closed, a 5V door signal is sent to the main control unit 30, and when the door switch 10 is opened, a 0V door signal is sent to the main control unit 30, so that the main control unit 30 can identify the current switch state of the door switch 10 according to the received door signal; when the main control unit 30 receives the door signal, it executes the preset function to control the drive unit 40 and other functions, thereby controlling the external load 50 to turn on and off; at the same time, the door switch 10 will also control the switch control unit 20 when it is closed and opened, so as to control the DC 12V power supply of the drive unit, thereby controlling the opening and closing of the external load, wherein, when the door switch 10 is turned on, the external load is controlled to turn on, and when the door switch 10 is closed, the external load is controlled to turn off.

[0024] That is to say, when the door switch 10 is closed, the main control unit 30 can perform the preset function normally, and when the door switch 10 is opened, the switch control unit 20 immediately cuts off the drive unit 40 at a speed of about 50ns. The main control unit 30 needs about 500us from detecting that the door switch 10 is opened to turning off the drive unit 40, which is much slower than the hard control. When the main control unit 30 fails and flies away, and at the moment of opening the door, the switch control unit 20 can quickly shut down the load operation to ensure the safety of personnel, thereby improving the safety and reliability of the use scenario of the commercial dishwasher, while extending the life of the door switch and reducing the material cost of the door switch.

[0025] In summary, the door switch protection control circuit can support both software and hardware control, so as to reduce the current and strong electricity flowing through the door switch contacts by improving the control mechanism of the door switch, thereby reducing the cost of the door switch and increasing the mechanical life; and by introducing a hardware control mechanism, the load can be quickly cut off, such as the water inlet solenoid valve and the washing pump, to prevent the washing water pump from splashing high-pressure and high-temperature water onto personnel, thereby improving the rapid shutdown capability; furthermore, the hardware control part can quickly shut down the load operation to prevent software failures from causing control protection failure, thereby improving the safety and reliability of the use scenarios of commercial dishwashers.

[0026] As an example, Figure 2 As shown, the switch control unit 20 includes a first resistor R1, a second resistor R2, a third resistor R3, a first transistor Q2, a second transistor Q3, a fourth resistor R6 and a MOS transistor Q1.

[0027] Among them, one end of the first resistor R1 is connected to the second power supply; one end of the second resistor R2 is connected to one end of the first resistor R1; one end of the third resistor R3 is connected to the other end of the second resistor R2; the collector of the first triode Q2 is connected to the other end of the third resistor R3, the emitter of the first triode Q2 is grounded, and the base of the first triode Q2 is connected to the other end of the first resistor R1; the collector of the second triode Q3 is connected to the base of the first triode Q2, and the emitter of the second triode Q3 is grounded; one end of the fourth resistor R4 is connected to the base of the second triode Q3, and the other end of the fourth resistor R6 is connected to the gate switch 10; the source of the MOS tube Q1 is connected to the second power supply, the drain of the MOS tube Q1 is connected to the driving unit 40, and the gate of the MOS tube Q1 is connected between the other end of the second resistor R2 and one end of the third resistor R3.

[0028] As an embodiment, the MOS tube Q1 is a PMOS tube.

[0029] As an embodiment, the load 50 includes a washing motor and a water inlet solenoid valve.

[0030] As an embodiment, the washing motor is connected to the driving unit 40 through a first relay, and the water inlet solenoid valve is connected to the driving unit 40 through a second relay, so that the driving unit 40 drives the washing motor to open or close through the first relay, and the driving unit 40 drives the water inlet solenoid valve to open or close through the second relay.

[0031] It should be noted that, since the load power supply is 220V AC, a relay is connected between the load 50 and the drive unit 40 to perform switch control.

[0032] In summary, according to the door switch protection control circuit proposed by the utility model, the input end of the door switch is connected to the first power supply to output a door signal; the first input end of the switch control unit is connected to the second power supply, and the second input end of the switch control unit is connected to the door switch to output a corresponding first control signal according to the door signal; the input end of the main control unit is connected to the door switch to output a corresponding second control signal according to the door signal; the first input end of the drive unit is connected to the main control unit, the second input end of the drive unit is connected to the switch control unit, and the output end of the drive unit is connected to the load, and the drive unit drives the load to open or close according to the first control signal and / or the second control signal; thereby, not only can the mechanical life of the door switch be extended and the product stability be improved, but also when the software fails, the load can be quickly cut off through hardware control to prevent the washing water pump from splashing high-pressure and high-temperature water to the user.

[0033] In addition, an embodiment of the utility model further provides a dishwasher, comprising the door switch protection control circuit as described above.

[0034] According to the dishwasher of the embodiment of the utility model, the door switch protection control circuit can not only extend the mechanical life of the door switch and improve product stability, but also quickly cut off the load through hardware control when the software fails, preventing the washing water pump from splashing high-pressure and high-temperature water to the user.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0040] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A door switch protection control circuit, characterized in that: include: A gate switch, wherein an input terminal of the gate switch is connected to a first power supply for outputting a gate signal; a switch control unit, wherein a first input terminal of the switch control unit is connected to a second power supply, a second input terminal of the switch control unit is connected to the gate switch, and the switch control unit is used to output a corresponding first control signal according to the gate signal; A main control unit, wherein an input end of the main control unit is connected to the door switch, and the main control unit is used to output a corresponding second control signal according to the door signal; A driving unit, wherein a first input end of the driving unit is connected to the main control unit, a second input end of the driving unit is connected to the switch control unit, an output end of the driving unit is connected to a load, and the driving unit drives the load to turn on or off according to the first control signal and / or the second control signal.

2. The door switch protection control circuit according to claim 1, characterized in that: The switch control unit comprises: a first resistor, wherein one end of the first resistor is connected to the second power supply; a second resistor, wherein one end of the second resistor is connected to one end of the first resistor; a third resistor, one end of the third resistor being connected to the other end of the second resistor; a first triode, wherein the collector of the first triode is connected to the other end of the third resistor, the emitter of the first triode is grounded, and the base of the first triode is connected to the other end of the first resistor; a second triode, wherein the collector of the second triode is connected to the base of the first triode, and the emitter of the second triode is grounded; a fourth resistor, one end of the fourth resistor being connected to the base of the second transistor, and the other end of the fourth resistor being connected to the gate switch; A MOS tube, wherein a source of the MOS tube is connected to the second power supply, a drain of the MOS tube is connected to the driving unit, and a gate of the MOS tube is connected between the other end of the second resistor and one end of the third resistor.

3. The door switch protection control circuit according to claim 2, characterized in that: The MOS tube is a PMOS tube.

4. The door switch protection control circuit according to claim 1, characterized in that: The first power supply is a 5V DC power supply, and the second power supply is a 12V DC power supply.

5. The door switch protection control circuit according to claim 1, characterized in that: The load includes a washing motor and a water inlet solenoid valve.

6. The door switch protection control circuit according to claim 5, characterized in that: The washing motor is connected to the driving unit through a first relay, and the water inlet solenoid valve is connected to the driving unit through a second relay, so that the driving unit drives the washing motor to open or close through the first relay, and the driving unit drives the water inlet solenoid valve to open or close through the second relay.

7. A dishwasher, characterized in that: The invention comprises the door switch protection control circuit according to any one of claims 1 to 6.

Images