Water inlet valve water inlet pulse control circuit and dish washing machine

Abstract

The water inlet valve water inlet pulse control circuit comprises a single chip microcomputer, a pulse circuit, a relay and a water inlet valve, the input end of the pulse circuit is connected to the single chip microcomputer, the output end of the pulse circuit is connected to a coil of the relay, and the water inlet valve is connected to a contact switch of the relay; when the dish-washing machine is in a water inlet stage, the single-chip microcomputer sends high-low level pulse signals to the pulse circuit, the pulse circuit outputs current to the coil of the relay, and the coil is electrified to attract the contact switch to open the water inlet valve; when the dish-washing machine is not in the water inlet stage, the single-chip microcomputer does not send high-low level pulse signals to the pulse circuit, the pulse circuit does not output current to the coil of the relay, the contact switch of the relay is kept disconnected, and the water inlet valve is kept closed. The control mode of the water inlet valve is changed into pulse control, the water inlet valve can be opened only when the single chip microcomputer sends out high-low level pulses, otherwise, the water inlet valve is kept in a normally-closed state, and therefore the situation that water enters the water inlet valve due to abnormal electrification is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of dishwasher water inlet valve control, and more specifically to a water inlet valve water inlet pulse control circuit and a dishwasher. Background Art

[0002] At present, dishwasher water inlet control is mostly controlled by normally closed solenoid valves, which are powered on and off. When the motherboard is overheated or other unknown factors cause the chip to be abnormal, the water inlet solenoid valve port may continue to be powered, causing the water inlet valve relay to be continuously attracted, causing the dishwasher to continue to be filled with water, flooding the user's kitchen.

[0003] Therefore, it is necessary to propose a new solution to solve the above problems. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the above-mentioned prior art and provides a water inlet valve water inlet pulse control circuit and a dishwasher. By changing the control mode of the water inlet valve to pulse control, the water inlet valve will be opened only when the single-chip microcomputer sends high and low level pulses, otherwise the water inlet valve remains in a normally closed state, so as to avoid the water inlet valve being abnormally energized and constantly inletting water.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A water inlet valve water inlet pulse control circuit comprises a single chip microcomputer, a pulse circuit, a relay and a water inlet valve, wherein the input end of the pulse circuit is connected to the single chip microcomputer, the output end of the pulse circuit is connected to the coil of the relay, and the water inlet valve is connected to the contact switch of the relay; when the dishwasher is in the water inlet stage, the single chip microcomputer sends high and low level pulse signals to the pulse circuit, the pulse circuit outputs current to the coil of the relay, the coil is energized to attract the contact switch to open the water inlet valve; when the dishwasher is not in the water inlet stage, the single chip microcomputer does not send high and low level pulse signals to the pulse circuit, the pulse circuit does not output current to the coil of the relay, the contact switch of the relay remains disconnected, and the water inlet valve remains closed.

[0007] Further, the pulse circuit includes a resistor R100, a capacitor C20, a diode D21, a diode D22, a capacitor EC7, a resistor R101, a resistor R102, a transistor Q20, a resistor R103, a resistor R104, a MOS tube Q21, and a diode D23. One end of the resistor R100 is connected to the single-chip microcomputer, and the other end of the resistor R100 is connected to one end of the capacitor C20. The other end of the capacitor C20 is respectively connected to the cathode of the diode D21 and the anode of the diode D22. The cathode of the diode D22 is respectively connected to one end of the capacitor EC7, one end of the resistor R01 and one end of the resistor R102. 2 is connected to the base of the transistor Q20, the emitter of the transistor Q20 is respectively connected to the anode of the diode D21, the other end of the capacitor EC7 and the other end of the resistor R01, and the common connection end thereof is grounded, the collector of the transistor Q20 is connected to one end of the resistor R103, the other end of the resistor R103 is respectively connected to one end of the resistor R104 and the gate of the MOS transistor Q21, the source of the MOS transistor Q21 is respectively connected to the other end of the resistor R104 and the cathode of the diode D23, and the common connection end thereof is connected to the +12V voltage, the drain of the MOS transistor Q21 is connected to the anode of the diode D23, and the common connection end thereof is connected to the coil of the relay.

[0008] The utility model also provides a dishwasher, comprising the water inlet pulse control circuit of the water inlet valve.

[0009] The beneficial effect of the utility model is that in the utility model, by changing the control mode of the water inlet valve to pulse control, the water inlet valve will be opened only when the single chip microcomputer sends high and low level pulses, otherwise the water inlet valve remains in a normally closed state to avoid the water inlet valve being abnormally energized and constantly inletting water. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the structure of the water inlet pulse control circuit of the water inlet valve in this embodiment;

[0011] Figure 2 is a circuit diagram of the pulse circuit in this embodiment.

[0012] Figure numerals: single chip microcomputer 1, pulse circuit 2, relay 3, water inlet valve 4. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] Embodiment: A water inlet valve water inlet pulse control circuit, such as Figure 1-Figure 2 As shown, it includes a single-chip microcomputer 1, a pulse circuit 2, a relay 3 and a water inlet valve 4, the input end of the pulse circuit 2 is connected to the single-chip microcomputer 1, the output end of the pulse circuit 2 is connected to the coil of the relay 3, and the water inlet valve 4 is connected to the contact switch of the relay 3; when the dishwasher is in the water filling stage, the single-chip microcomputer 1 sends high and low level pulse signals to the pulse circuit 2, the pulse circuit 2 outputs current to the coil of the relay 3, the coil is energized to attract the contact switch to open the water inlet valve 4; when the dishwasher is not in the water filling stage, the single-chip microcomputer 1 does not send high and low level pulse signals to the pulse circuit 2, the pulse circuit 2 does not output current to the coil of the relay 3, the contact switch of the relay 3 remains disconnected, and the water inlet valve 4 remains closed.

[0015] By adopting the above method, the control mode of the water inlet valve 4 is changed to pulse control. The water inlet valve 4 will be opened only when the single chip microcomputer 1 sends high and low level pulses, otherwise the water inlet valve 4 remains in a normally closed state.

[0016] Further, such as Figure 2 As shown, the pulse circuit 2 includes a resistor R100, a capacitor C20, a diode D21, a diode D22, a capacitor EC7, a resistor R101, a resistor R102, a transistor Q20, a resistor R103, a resistor R104, a MOS transistor Q21, and a diode D23. One end (JSF end) of the resistor R100 is the input end of the pulse circuit 2, connected to the single-chip computer 1, and used to control the high and low level pulse signals. The other end of the resistor R100 is connected to one end of the capacitor C20, and the other end of the capacitor C20 is respectively connected to the cathode of the diode D21 and the anode of the diode D22. The cathode of the diode D22 is respectively connected to one end of the capacitor EC7, one end of the resistor R01 and one end of the resistor R102. The other end of the resistor R102 is connected to the transistor The base of Q20 and the emitter of the transistor Q20 are respectively connected to the positive electrode of the diode D21, the other end of the capacitor EC7 and the other end of the resistor R01, and their common connection end is grounded. The collector of the transistor Q20 is connected to one end of the resistor R103, and the other end of the resistor R103 is respectively connected to one end of the resistor R104 and the gate of the MOS transistor Q21. The source of the MOS transistor Q21 is respectively connected to the other end of the resistor R104 and the negative electrode of the diode D23, and their common connection end is connected to a +12V voltage. The drain of the MOS transistor Q21 is connected to the positive electrode of the diode D23, and its common connection end (JSF′ end) is the output end of the pulse circuit 2, which is connected to the coil of the relay 3 and is used to control the relay 3 to be attracted and disconnected, so as to control the opening and closing of the water inlet valve 4.

[0017] When the dishwasher is in the water filling stage, the single-chip computer 1 sends high and low level pulse signals to the input end of the pulse circuit 2, the pulse circuit 2 outputs current to the coil of the relay 3, the coil is energized to attract the contact switch to open the water inlet valve 4; when the dishwasher is not in the water filling stage, the single-chip computer 1 does not send high and low level pulse signals, the pulse circuit 2 does not output current to the coil of the relay 3, the contact switch of the relay 3 remains disconnected, and the water inlet valve 4 remains closed.

[0018] The present embodiment also provides a dishwasher, comprising the above-mentioned water inlet valve water inlet pulse control circuit. Specifically, the dishwasher of the present embodiment, due to the use of the above-mentioned water inlet valve water inlet pulse control circuit, changes the control mode of the water inlet valve 4 to pulse control, and only when the single chip computer 1 sends high and low level pulses will the water inlet valve 4 be opened, otherwise the water inlet valve 4 remains in a normally closed state, so as to avoid the water inlet valve 4 being abnormally energized and constantly inletting water.

[0019] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A water inlet valve water inlet pulse control circuit, characterized in that: The dishwasher comprises a single-chip computer (1), a pulse circuit (2), a relay (3) and a water inlet valve (4); the input end of the pulse circuit (2) is connected to the single-chip computer (1), the output end of the pulse circuit (2) is connected to the coil of the relay (3), and the water inlet valve (4) is connected to the contact switch of the relay (3); when the dishwasher is in the water inlet stage, the single-chip computer (1) sends high and low level pulse signals to the pulse circuit (2), the pulse circuit (2) outputs current to the coil of the relay (3), the coil is energized to attract the contact switch to open the water inlet valve (4); when the dishwasher is not in the water inlet stage, the single-chip computer (1) does not send high and low level pulse signals to the pulse circuit (2), the pulse circuit (2) does not output current to the coil of the relay (3), the contact switch of the relay (3) remains disconnected, and the water inlet valve (4) remains closed.

2. A water inlet valve water inlet pulse control circuit according to claim 1, characterized in that: The pulse circuit (2) comprises a resistor R100, a capacitor C20, a diode D21, a diode D22, a capacitor EC7, a resistor R101, a resistor R102, a transistor Q20, a resistor R103, a resistor R104, a MOS transistor Q21, and a diode D23. One end of the resistor R100 is connected to the single-chip computer (1), the other end of the resistor R100 is connected to one end of the capacitor C20, the other end of the capacitor C20 is respectively connected to the cathode of the diode D21 and the anode of the diode D22, the cathode of the diode D22 is respectively connected to one end of the capacitor EC7, one end of the resistor R01 and one end of the resistor R102, and the resistor R102 The other end of the transistor is connected to the base of the transistor Q20, the emitter of the transistor Q20 is respectively connected to the anode of the diode D21, the other end of the capacitor EC7 and the other end of the resistor R01, and the common connection end thereof is grounded, the collector of the transistor Q20 is connected to one end of the resistor R103, the other end of the resistor R103 is respectively connected to one end of the resistor R104 and the gate of the MOS transistor Q21, the source of the MOS transistor Q21 is respectively connected to the other end of the resistor R104 and the cathode of the diode D23, and the common connection end thereof is connected to a +12V voltage, the drain of the MOS transistor Q21 is connected to the anode of the diode D23, and the common connection end thereof is connected to the coil of the relay (3).

3. A dishwasher, characterized in that: It comprises the water inlet pulse control circuit of the water inlet valve as described in any one of claims 1-2.

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