Dishwasher and power supply control device thereof

Abstract

The present invention discloses a dishwasher and a power supply control device thereof, wherein the control device comprises a first switch circuit, a second switch circuit and a switch control circuit, the first switch circuit and the second switch circuit are connected in parallel between the power supply circuit and the AC live wire of the dishwasher, the control end of the switch control circuit is connected to the controlled end of the second switch circuit, and the controlled end of the switch control circuit is connected to the main controller of the dishwasher; the control device also comprises a switch auxiliary opening circuit, the control end of the switch auxiliary opening circuit is connected to the controlled end of the switch control circuit, and the controlled end of the switch auxiliary opening circuit is controlled by the washing water in the dishwasher tank. The dishwasher power supply control device of the present invention is controlled by dual live wire switching, the dishwasher is powered on during the door opening process, and the switch control circuit is controlled to be turned on after the liquid level probe is short-circuited, so as to achieve zero standby power consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of dishwashers, and in particular to a dishwasher and a power supply control device thereof. Background Art

[0002] Energy conservation and emission reduction has become a topic of common concern in today's world, and dishwashers are also constantly developing in the direction of low energy consumption. At present, the existing technology mainly uses a low-power switching power supply in the dishwasher to reduce the standby power consumption. For the current industry power consumption standards, the power consumption of the dishwasher in shutdown mode or standby / restart mode shall not exceed 0.5W, and the power consumption of the standby or restart mode of products with display functions shall not exceed 1W. Therefore, under such strict requirements on standby power consumption, the power consumed by the circuit on the electronic control board of the dishwasher needs to be reduced as much as possible. Since the multiple signal detection circuits and display circuits on the electronic control board of the dishwasher will work after the electronic control board is powered on, the standby power consumption of the dishwasher will be increased invisibly. For the existing technology that only uses a low-power switching power supply, it is impossible to reduce the standby power consumption to the above-mentioned standby power consumption requirements, which will cause the dishwasher to fail to meet the requirements of the industry power consumption standards. Summary of the invention

[0003] In order to solve the technical problem of high standby power consumption of existing dishwashers mentioned in the background technology, the present invention provides a dishwasher and a power supply control device thereof, which can realize zero standby power consumption by switching control of dual live wires and powering on the dishwasher when the door is opened.

[0004] To achieve the above-mentioned purpose, the specific technical solutions of a dishwasher and a power supply control device thereof of the present invention are as follows:

[0005] A dishwasher power supply control device comprises a first switch circuit, a second switch circuit and a switch control circuit, wherein the first switch circuit and the second switch circuit are connected in parallel between the dishwasher power supply circuit and the AC live wire, the control end of the switch control circuit is connected to the controlled end of the second switch circuit, and the controlled end of the switch control circuit is connected to the dishwasher main controller;

[0006] When the door of the dishwasher is opened, the first switch circuit is turned on, the power circuit is powered on, the power circuit outputs direct current, and the main controller outputs a start drive signal to the switch control circuit to control the switch control circuit to turn on. When the switch control circuit is turned on, the second switch circuit is turned on, and the live wire end of the power circuit is connected to the live wire of the AC power supply, so that the whole dishwasher is powered on;

[0007] When the door of the dishwasher switches from an open state to a closed state, the first switch circuit is disconnected, the main controller continuously outputs an opening drive signal to the switch control circuit, the switch control circuit is continuously turned on, and controls the second switch circuit to be continuously turned on;

[0008] The control device also includes a switch-assisted opening circuit, the control end of the switch-assisted opening circuit is connected to the controlled end of the switch control circuit, and the controlled end of the switch-assisted opening circuit is controlled by the washing water in the dishwasher sink. When the switch-assisted opening circuit is turned on, the switch-assisted opening circuit controls the switch control circuit to turn on, and the main controller stops outputting an opening drive signal to the switch control circuit.

[0009] Furthermore, the switch-assisted opening circuit includes a washing water detection component, and when the washing water detection component contacts the washing water in the sink, the switch-assisted opening circuit is turned on.

[0010] Furthermore, the washing water detection element includes a pair of liquid level probes, one liquid level probe is connected to the third resistor, and the other liquid level probe is connected to the switch control circuit.

[0011] Further, the liquid level probe is arranged at the lowest point of the dishwasher sink.

[0012] Furthermore, the main controller is electrically connected to the drying fan and the residual water pump of the dishwasher. When the main controller obtains that the drying fan switches from the on state to the off state, and / or when the main controller obtains that the residual water pump switches from the off state to the working state, the main controller outputs an on drive signal to the switch control circuit to start the residual water pump.

[0013] Furthermore, the second switching circuit includes a relay and a first diode, the common point of the first contact of the relay and the cathode of the first diode is the power supply end of the second switching circuit, the common point of the second contact of the relay and the anode of the first diode is the controlled end of the second switching circuit, and the third contact and the fourth contact of the relay are the input end and the output end of the second switching circuit respectively.

[0014] Furthermore, the switch control circuit includes a first resistor and an NPN transistor, one end of the first resistor is connected to the main controller, the other end of the first resistor is connected to the base of the NPN transistor, the collector of the NPN transistor is the control end of the switch control circuit, and the emitter of the NPN transistor is grounded.

[0015] Furthermore, the first switch circuit includes a door switch, and the door switch is a mechanical switch.

[0016] Furthermore, the control device also includes a timer, which is electrically connected to the main controller. When the timer obtains that the duration of the main controller outputting the start-up drive signal to the switch control circuit exceeds a duration threshold, the main controller stops outputting the start-up drive signal to the switch control circuit.

[0017] A dishwasher comprises the above-mentioned dishwasher power supply control device.

[0018] A dishwasher and a power supply control device thereof of the present invention have the following advantages:

[0019] The dishwasher power supply control device described in the present invention is controlled by dual live wire switching, and the dishwasher is powered on during the door opening process to achieve zero standby power consumption; during the process of the liquid level probe detecting the liquid level, the liquid level detection circuit drives the switch control circuit to be continuously triggered to ensure that the main controller is not reset due to interference and the dishwasher does not enter a power-off state. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the power supply control device of the dishwasher of the present invention;

[0021] Figure 2 This is a schematic structural diagram of another embodiment of the dishwasher power supply control device of the present invention.

[0022] Explanation of the numbers in the figure: 1. First switch circuit; 2. Main controller; 3. Second switch circuit; 4. Switch control circuit; 5. Switch auxiliary opening circuit; 6. Power supply circuit. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the present invention, a dishwasher and a power supply control device thereof of the present invention are further described in detail below with reference to the accompanying drawings.

[0024] Figure 1 The structure diagram of a dishwasher power supply control device is schematically shown. For the convenience of explanation, only the parts related to the embodiment of the present invention are shown. Figure 1 As shown, the dishwasher power supply control device provided by the present invention includes a power supply circuit 6 and a main controller 2. The power supply circuit 6 is connected to an AC power supply. When the power supply circuit 6 receives AC power input, it converts the AC power into DC power (such as +5V DC, +12V DC or +24V DC, etc.) to power the main controller 2 and the electrical equipment in the dishwasher.

[0025] The control device also includes a first switch circuit 1, a second switch circuit 3 and a switch control circuit 4. The first switch circuit 1 is arranged in parallel with the second switch circuit 3, and the common live wire end of the two switch circuits is connected to the live wire of the AC power supply, the common neutral wire end of the two switch circuits is connected to the live wire end of the dishwasher power circuit 6, the neutral wire end of the power circuit 6 is connected to the neutral wire, the control end of the switch control circuit 4 is connected to the controlled end of the second switch circuit 3, and the controlled end of the switch control circuit 4 is connected to the main controller 2.

[0026] When the door of the dishwasher is opened, the first switch circuit 1 is turned on, the power circuit 6 is powered on, the power circuit 6 outputs direct current, and the main controller 2 outputs a start drive signal to the switch control circuit 4 to control the switch control circuit 4 to be turned on. When the switch control circuit 4 is turned on, the second switch circuit 3 is controlled to be turned on, so that the live wire end of the power circuit 6 is connected to the live wire of the AC power supply, so that the whole dishwasher is powered on;

[0027] When the door of the dishwasher switches from an open state to a closed state, the first switch circuit 1 is disconnected. Since the main controller 2 continues to output an opening drive signal to the switch control circuit 4, the switch control circuit 4 continues to be turned on, controlling the second switch circuit 3 to be turned on continuously. At this time, the live wire end of the power supply circuit 6 and the live wire of the AC power supply are in a conducting state through the second switch circuit 3.

[0028] The control device further includes a switch auxiliary opening circuit 5, the control end of the switch auxiliary opening circuit 5 is connected to the controlled end of the switch control circuit 4, the controlled end of the switch auxiliary opening circuit 5 is controlled by the washing water in the dishwasher tank, and the stability of the dishwasher is improved by setting the switch auxiliary opening circuit 5. When the switch auxiliary opening circuit 5 is turned on, the conduction of the switch control circuit 4 can be controlled by the switch auxiliary opening circuit 5.

[0029] In this embodiment, the switch-assisted opening circuit 5 includes a washing water detection element. When the washing water detection element contacts the washing water in the water tank, the switch-assisted opening circuit 5 is turned on.

[0030] like Figure 2 As shown, the washing water detection component includes a pair of liquid level probes, one of which is connected to the third resistor R3, the other end of the third resistor R3 is a power supply end, and the other liquid level probe is connected to the switch control circuit 4. When the dishwasher is running, the main controller 2 controls the washing assembly of the dishwasher to inject water into the water tank, and the water short-circuits the two liquid level probes, thereby turning on the switch auxiliary opening circuit 5 and providing a high potential for the switch control circuit 4. The switch control circuit 4 controls the switch control circuit 5 to turn on, thereby keeping the power supply circuit 6 in a power-on state, effectively preventing the main controller 2 from being reset due to external interference, and the transistor Q1 is turned off, so that the dishwasher enters a zero-power standby state and does not work, thereby improving the stability of the whole machine.

[0031] Usually, when the washing water short-circuits the two liquid level probes, the voltage across the third resistor R3 and the current flowing through the third resistor R3 change. By detecting the electrical signal of the third resistor R3, it can be determined whether the switch auxiliary opening circuit 5 is turned on.

[0032] The dishwasher will perform a drain operation during the washing and drying processes. In order to ensure that the water in the sink or the residual water in the sink can short-circuit the liquid level probe, the liquid level probe is set at the lowest point of the dishwasher sink. During the draining process, the drain pump is turned on to drain the water. There is a certain amount of residual water in the water cup of the dishwasher. Therefore, after the dishwasher is dried, there is still a certain liquid level in the sink to ensure that the dishwasher is always powered on.

[0033] In other embodiments, the washing water detection member may also use a liquid level probe, and the other liquid level probe may be replaced by a water tank. Any structure in the prior art that can achieve washing water soaking the washing water detection member to enable the switch to assist in opening the circuit can be used as the washing water detection member of the present application.

[0034] In one embodiment, the dishwasher includes a drying component, the drying component includes a drying channel and a drying fan, the drying fan is placed in the drying channel, the control circuit of the drying fan is electrically connected to the main controller 2, the main controller 2 obtains the operating parameters of the drying fan in real time, such as the driving current and driving voltage of the drying fan, to determine the operating state of the drying fan, when the main controller 2 obtains that the drying fan switches from the on state to the stopped state, the main controller 2 outputs an on drive signal to the switch control circuit 4, that is, the main controller 2 outputs a high level to the switch control circuit 4, so that the main controller 2 drives the switch control circuit 4 to be continuously turned on to power the dishwasher.

[0035] In another embodiment, the dishwasher includes a water removal pump, and the control circuit of the water removal pump is electrically connected to the main controller 2. When the main controller 2 obtains that the water removal pump switches from a stopped state to a working state, the main controller 2 obtains the operating state of the water removal pump by detecting the electrical parameters of the water removal pump (such as current, voltage, etc.), and the main controller 2 outputs an on-drive signal to the switch control circuit 4. At the same time, the water removal pump is controlled to be turned on to drain the water in the sink. The two liquid level probes are disconnected, and the dishwasher is in a standby state. After the water removal pump stops, the dishwasher is used, and the main controller 2 stops outputting the on-drive signal to the switch control circuit 4, the switch control circuit 4 is disconnected, and the first switch circuit 1 is disconnected, so that the dishwasher is in a completely power-off state.

[0036] In addition, the working status of the drying fan and the residual water pump can be detected simultaneously. When it is detected that the drying fan stops and the residual water pump starts, the main controller 2 outputs an on-drive signal to the switch control circuit 4 .

[0037] During actual use, the dishwasher door will be opened when only taking and placing dishes or taking and placing dishes and washing them. Therefore, after the dishwasher door is switched from an open state to a closed state and the main controller 2 receives the power supply information from the power circuit 6, it determines whether the dishwasher enters the standby state.

[0038] Specifically, the control device also includes a timer, which is electrically connected to the main controller 2. The timer is used to record the duration of the main controller 2 outputting the start drive signal to the switch control circuit 4. When the timer obtains that the duration of the main controller 2 outputting the start drive signal to the switch control circuit 4 exceeds a duration threshold, the main controller 2 stops outputting the start drive signal to the switch control circuit 4.

[0039] In addition, the main controller 2 can also monitor in real time whether the washing component, drying component and other electrical equipment of the dishwasher are running to confirm whether the dishwasher has entered standby mode.

[0040] Specifically, in order to achieve zero power consumption when the dishwasher is in standby mode, the first switch circuit 1 includes a door switch SW, which is a mechanical switch. When the door of the dishwasher is opened, the mechanical switch is closed to connect the live wire end of the power supply circuit 6 to the live wire; when the door is closed, the mechanical switch is opened to disconnect the live wire end of the power supply circuit 6 from the live wire.

[0041] In one embodiment, if Figure 2 As shown, the second switch circuit 3 includes a relay K1 and a first diode D1, the common point of the first contact a of the relay K1 and the cathode of the first diode D1 is the power supply end of the second switch circuit 3, the common point of the second contact b of the relay K1 and the anode of the first diode D1 is the controlled end of the second switch circuit 3, the third contact c and the fourth contact d of the relay K1 are the input end and the output end of the second switch circuit 3, respectively, and are respectively connected to the live wire and the live wire end of the power supply circuit 6.

[0042] In other implementations, the second switch circuit 3 may also be an optocoupler device, which can also achieve the above functions.

[0043] like Figure 2 As shown, the switch control circuit 4 includes a first resistor R1 and a transistor Q1, one end of the first resistor R1 is a controlled end and is connected to the main controller 2, the other end of the first resistor R1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is the control end of the switch control circuit 4, the emitter of the transistor Q1 is grounded, the transistor Q1 is an NPN transistor, the transistor Q1 controls the switch of the relay K1, the base of the transistor Q1 inputs a high level, the transistor Q1 is turned on; the base of the transistor Q1 is low level, the transistor Q1 is turned off, thereby realizing the on-off control of the second switch circuit 3.

[0044] In order to ensure that the base of the transistor Q1 is at a low level when the dishwasher is in standby mode, a second resistor R2 is connected in parallel between the base and emitter of the transistor Q1 to prevent the transistor Q1 from being mistakenly turned on and the relay K1 from malfunctioning to power on the power circuit 6.

[0045] When the switch-assisted start-up circuit 5 is turned on, after the DC power supply is divided by resistors R2 and R3, the base voltage of the transistor Q1 may be higher than the start-up drive signal output by the main controller 2. In order to prevent the current from damaging the main controller 2, the control device also includes a second diode D2, the cathode end of the second diode D2 is connected to the controlled end of the first resistor R1, and the anode end of the second diode D2 is connected to the main controller 2.

[0046] The dishwasher control device of the present invention controls the connection between the live wire and the power circuit 6 through the door switch SW, the power circuit 6 outputs direct current, the main controller 2 outputs an opening drive signal to the transistor Q1, the transistor Q1 turns on the relay K1, and then the relay K1 is turned on, so that the live wire and the power circuit 6 are connected. When the power-on time of the power circuit 6 exceeds the time threshold, the main controller 2 outputs a power-off signal to the transistor Q1, that is, a low level, and the dishwasher is completely powered off; if the power-on time of the power circuit 6 does not exceed the time threshold, the conduction status of the liquid level probe is detected, and the switch-assisted opening circuit 5 is turned on, so that the transistor Q1 drives the relay K1 to be continuously closed, and the power circuit 6 is continuously turned on.

[0047] The washing water in the dishwasher short-circuits the liquid level probe, so that the transistor Q1 is always turned on when the dishwasher is working, the relay K1 is continuously closed, and the power supply circuit 6 is always powered; to prevent the main controller 2 from being reset by external interference when the dishwasher is working, the transistor Q1 is turned off, and the whole machine enters the standby 0 power consumption state and does not work; to improve the stability of the whole machine. The liquid level probe is set at the lowest point of the dishwasher sink to take advantage of the fact that there is still a certain amount of residual water in the cup after the dishwasher is dried. Even after the drying is completed, the dishwasher can be powered on because there is still liquid in the sink; when the power is off, the liquid level probe is disconnected by the residual water pump, and the main controller 2 level enters the standby state; the logic is as follows: the main controller 2 first controls the output high level to control the transistor Q1 to be turned on; then, the residual water pump is started to pump out the residual water in the dishwasher sink, so that the liquid level probe is disconnected; the main controller 2 outputs a low level, the power supply circuit 6 is disconnected, and the dishwasher is completely powered off.

[0048] Based on the positive role of the above-mentioned dishwasher power supply control device in zero-power standby and operation, the present invention also provides a dishwasher, including the above-mentioned dishwasher power supply control device.

[0049] The dishwasher power supply control device is controlled by dual live wire switching. The dishwasher is powered on during the process of opening the door to achieve zero standby power consumption. During the process of the liquid level probe detecting the liquid level, the switch auxiliary opening circuit is turned on and drives the switch control circuit 4 to be continuously triggered to ensure that the main controller 2 is not reset due to interference and the dishwasher does not enter a power-off state.

[0050] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A dishwasher power supply control device, characterized in that: It includes a first switch circuit, a second switch circuit and a switch control circuit, the first switch circuit and the second switch circuit are connected in parallel between the power circuit of the dishwasher and the AC live wire, the control end of the switch control circuit is connected to the controlled end of the second switch circuit, and the controlled end of the switch control circuit is connected to the main controller of the dishwasher; When the door of the dishwasher is opened, the first switch circuit is turned on, the power circuit is powered on, the power circuit outputs direct current, and the main controller outputs a start drive signal to the switch control circuit to control the switch control circuit to turn on. When the switch control circuit is turned on, the second switch circuit is turned on, and the live wire end of the power circuit is connected to the live wire of the AC power supply, so that the whole dishwasher is powered on; When the door of the dishwasher switches from an open state to a closed state, the first switch circuit is disconnected, the main controller continuously outputs an opening drive signal to the switch control circuit, the switch control circuit is continuously turned on, and controls the second switch circuit to be continuously turned on; The control device also includes a switch-assisted opening circuit, the control end of the switch-assisted opening circuit is connected to the controlled end of the switch control circuit, and the controlled end of the switch-assisted opening circuit is controlled by the washing water in the dishwasher sink. When the switch-assisted opening circuit is turned on, the switch-assisted opening circuit controls the switch control circuit to turn on, and the main controller stops outputting an opening drive signal to the switch control circuit.

2. The dishwasher power supply control device according to claim 1, characterized in that: The switch-assisted opening circuit includes a washing water detection element. When the washing water detection element contacts the washing water in the water tank, the switch-assisted opening circuit is turned on.

3. The dishwasher power supply control device according to claim 2, characterized in that: The washing water detection element comprises a pair of liquid level probes, one of which is connected to the third resistor and the other is connected to the switch control circuit.

4. The dishwasher power supply control device according to claim 3, characterized in that: The level probe is located at the lowest point of the dishwasher sink.

5. The dishwasher power supply control device according to claim 1, characterized in that: The main controller is electrically connected to the drying fan and the residual water pump of the dishwasher. When the main controller obtains that the drying fan switches from the on state to the off state, and / or before the main controller obtains that the residual water pump switches from the off state to the working state, the main controller outputs an on drive signal to the switch control circuit to start the residual water pump.

6. The dishwasher power supply control device according to claim 1, characterized in that: The second switch circuit includes a relay and a first diode, the common point of the first contact of the relay and the cathode of the first diode is the power supply end of the second switch circuit, the common point of the second contact of the relay and the anode of the first diode is the controlled end of the second switch circuit, and the third contact and the fourth contact of the relay are the input end and the output end of the second switch circuit respectively.

7. The dishwasher power supply control device according to claim 1, characterized in that: The switch control circuit includes a first resistor and an NPN transistor, one end of the first resistor is connected to the main controller, the other end of the first resistor is connected to the base of the NPN transistor, the collector of the NPN transistor is the control end of the switch control circuit, and the emitter of the NPN transistor is grounded.

8. The dishwasher power supply control device according to claim 1, characterized in that: The first switch circuit includes a door switch, which is a mechanical switch.

9. The dishwasher power supply control device according to claim 1, characterized in that: The control device also includes a timer, which is electrically connected to the main controller. When the timer obtains that the duration of the main controller outputting the start drive signal to the switch control circuit exceeds a duration threshold, the main controller stops outputting the start drive signal to the switch control circuit.

10. A dishwasher, characterized in that: It comprises the dishwasher power supply control device as described in any one of claims 1-9.

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