CN214142940U - Washing machine door lock control circuit and washing machine - Google Patents
Washing machine door lock control circuit and washing machine Download PDFInfo
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- CN214142940U CN214142940U CN202022481110.8U CN202022481110U CN214142940U CN 214142940 U CN214142940 U CN 214142940U CN 202022481110 U CN202022481110 U CN 202022481110U CN 214142940 U CN214142940 U CN 214142940U
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Abstract
The utility model discloses a washing machine lock control circuit and washing machine, this washing machine lock control circuit includes lock control unit, motor control unit and controller, the motor control unit still includes reversal control unit and corotation control unit, the reversal control unit is used for when washing machine finishes or pauses the preset operation procedure and accords with the preset condition of opening the door, according to the first signal cutting that the controller sent with the connection of the first end of lock control unit; the forward rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a second signal sent by the controller when the washing machine finishes or pauses the preset operation program and accords with the preset door opening condition, and the coupling voltage transmission path of the driving motor is cut off when the washing machine finishes or pauses the preset operation program and accords with the preset door opening condition, so that the door lock control accuracy is improved, and the user experience is improved.
Description
Technical Field
The application relates to the field of washing machine control, in particular to a washing machine door lock control circuit and a washing machine.
Background
With the increasing of household electrical equipment and the continuous and severe power supply electromagnetic environment, users and markets also put higher requirements on the reliability of the whole machine.
The current washing machine scheme and operating environment have the following characteristics: considering cost pressure, a scheme of a series excited (non-variable frequency) motor is preferentially adopted; secondly, technological errors exist in the production process of inductive loads such as motors and the like, and the inductive loads cannot be completely consistent; and thirdly, when the power grid of part of areas is unstable or a plurality of electric appliances work simultaneously, the running electromagnetic environment is relatively severe.
Based on the characteristics, the prior art has the following problems: in the running process of the series excited motor, due to the fact that space coupling electromagnetic waves of a winding coil of the motor are serious, self-generated voltage is high (particularly when a winding process is improper or an enameled wire is poor), when a preset program is run and a door is opened, the coupling voltage can be transmitted to a board end detection circuit through a wire harness by the motor, the phenomenon that the door is actually opened but detected and identified as a door locking state is caused, and fault alarming (such as F14 and the like, wherein the defect of 3% of machine types of a part of machines) causes maintenance and user complaints. Secondly, when the user home socket LN is reversely connected, the coupling voltage value is higher (when the actually measured input 264 and LN are reversely connected, the coupling voltage can reach about 140V), and the alarm probability is higher.
Therefore, how to provide a washing machine door lock control circuit for improving the control reliability of the washing machine door lock is a technical problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The utility model provides a washing machine lock control circuit for solve among the prior art because the coupling voltage of series excited machine causes washing machine lock state false detection easily, technical problem that lock control reliability is low.
The circuit comprises a door lock control unit, a motor control unit and a controller, wherein the motor control unit also comprises a reverse rotation control unit and a forward rotation control unit, the first end of the reverse rotation control unit is connected with the first end of the controller, the first end of the forward rotation control unit is connected with the second end of the controller, the common joint point of the second end of the reverse rotation control unit and the second end of the forward rotation control unit is connected with the first end of the door lock control unit, the second end of the door lock control unit is connected with the third end of the controller, wherein,
the reverse rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a first signal sent by the controller when the washing machine finishes or suspends a preset operation program and meets a preset door opening condition;
and the forward rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a second signal sent by the controller when the washing machine finishes or suspends the preset operation program and meets the preset door opening condition.
In some embodiments of the present application, the door lock control unit further comprises a door lock detection unit and a door lock driving unit, the first end of the door lock detection unit is the second end of the door lock control unit, the second end of the door lock detection unit is the first end of the door lock control unit, the first end of the door lock driving unit is connected to the fourth end of the controller, the second end of the door lock driving power supply and the second end of the door lock detection unit are further connected to the door lock of the washing machine respectively, wherein,
the door lock detection unit is used for sending a square wave signal to a third end of the controller when the preset operation program runs so as to enable the controller to determine that the door lock of the washing machine is in a locking state; sending a high level signal to a third terminal of the controller when the preset operation program is ended or suspended so that the controller determines that the washing machine door lock is not in the locking state;
and the door lock driving unit is used for closing a door lock driving signal according to a control signal sent by the controller when the washing machine finishes or suspends the preset operation program and meets the preset door opening condition so as to enable the washing machine door lock to exit the locking state.
In some embodiments of the present application, the third terminal of the reverse rotation control unit and the fourth terminal of the reverse rotation control unit are further connected to a driving motor of the washing machine, respectively, the reverse rotation control unit further includes a first resistor, a second resistor, a first triode, a first diode, and a first relay, wherein,
the first end of the first resistor is the first end of the inversion control unit, the second end of the first resistor and the first end of the second resistor are connected to the base electrode of the first triode in a sharing mode, the collector electrode of the first triode and the anode of the first diode are connected to the first end of the coil of the first relay in a sharing mode, the second end of the coil of the first relay and the common junction of the cathode of the first diode are connected with a 12V direct-current power supply, the first end of the switch of the first relay is the third end of the inversion control unit, the second end of the switch of the first relay is the fourth end of the inversion control unit, the third end of the switch of the first relay is the second end of the inversion control unit, and the common junction of the second end of the second resistor and the emitter electrode of the first triode is grounded.
In some embodiments of the present application, the inversion control unit is specifically configured to:
and when the first signal is received, the first end of the switch of the first relay and the second end of the switch of the first relay are conducted to cut off the connection with the first end of the door lock control unit.
In some embodiments of the present application, the third terminal of the forward rotation control unit and the fourth terminal of the forward rotation control unit are further connected to the driving motor, respectively, the forward rotation control unit further includes a third resistor, a fourth resistor, a second triode, a second diode, and a second relay, wherein,
the first end of the third resistor is the first end of the forward rotation control unit, the second end of the third resistor and the first end of the fourth resistor are connected to the base electrode of the second triode, the collector electrode of the second triode and the anode of the second diode are connected to the first end of the coil of the second relay, the second end of the coil of the second relay and the common junction of the cathode of the second diode are connected with a 12V direct-current power supply, the first end of the switch of the second relay is the third end of the forward rotation control unit, the second end of the switch of the second relay is the fourth end of the forward rotation control unit, the third end of the switch of the second relay is the second end of the forward rotation control unit, and the common junction of the second end of the fourth resistor and the emitter electrode of the second triode is grounded.
In some embodiments of the present application, the forward rotation control unit is specifically configured to:
and when the second signal is received, the first end of the switch of the second relay and the second end of the switch of the second relay are conducted to cut off the connection with the first end of the door lock control unit.
In some embodiments of the present invention, the door lock detection unit further includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third transistor, a third diode, a fourth diode, a first capacitor, and a second capacitor, wherein,
the first ends of the first capacitor and the fifth resistor are connected to the first end of the door lock detection unit, the second end of the fifth resistor and the first end of the sixth resistor are connected to the collector of the third triode in common, the second end of the sixth resistor is connected with a 5V direct current power supply, the first end of the second capacitor, the cathode of the third diode, the first end of the seventh resistor and the first end of the eighth resistor are connected to the base electrode of the third triode in common, a second end of the eighth resistor is connected to a first end of the ninth resistor, a second end of the ninth resistor is connected to a cathode of the fourth diode, an anode of the fourth diode is a second end of the door lock detection unit, the second end of the first capacitor is grounded, and the common junction of the emitter of the third triode, the second end of the second capacitor, the anode of the third diode and the second end of the seventh resistor is grounded.
In some embodiments of the present application, the door lock detection unit is specifically configured to:
and when the first end of the door lock control unit is not connected with the reverse rotation control unit and the forward rotation control unit, the third triode is controlled to be cut off so as to output a high-level signal to the third end of the controller based on the first end of the door lock detection unit.
In some embodiments of the present application, the controller is further connected to a display screen, and the controller is further configured to:
when a high level signal output by the first end of the door lock detection unit is received, controlling a preset door lock icon on the display screen to be turned off and switching to a preset end prompt mode;
and switching on a second terminal of the switch of the first relay and a third terminal of the switch of the first relay, and switching on a second terminal of the switch of the second relay and a third terminal of the switch of the second relay to release the first relay and the second relay.
Correspondingly, the utility model also provides a washing machine, include as above washing machine lock control circuit, still include:
a housing provided with a door for putting in the washings;
an outer tub disposed inside the cabinet and storing washing water therein;
a drum arranged at the inner side of the outer barrel for accommodating the washings;
a driving module disposed in the tub for rotating the drum;
a water supply module for supplying the washing water to the outer tub;
a water draining module for draining the washing water stored in the outer tub.
By applying the technical scheme, in a washing machine door lock control circuit comprising a door lock control unit, a motor control unit and a controller, the motor control unit further comprises a reverse rotation control unit and a forward rotation control unit, and the reverse rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a first signal sent by the controller when the washing machine finishes or suspends a preset operation program and meets a preset door opening condition; the forward rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a second signal sent by the controller when the washing machine finishes or pauses the preset operation program and accords with the preset door opening condition, and the coupling voltage transmission path of the driving motor is cut off when the washing machine finishes or pauses the preset operation program and accords with the preset door opening condition, so that the door lock control accuracy is improved, and the user experience is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 shows a schematic structural diagram of a washing machine door lock control circuit according to an embodiment of the present invention;
fig. 2 shows a schematic structural diagram of a reverse rotation control unit and a forward rotation control unit in an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a door lock detection control unit and a door lock driving control unit in an embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a controller according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
The washing machine of some embodiments of the present application includes:
a cabinet for forming an external appearance, provided with a door for inputting laundry, the door being provided at an upper portion or a front portion of the cabinet;
an outer tub disposed inside the cabinet and storing washing water therein;
a drum disposed inside the tub, for storing laundry therein and washing the laundry;
a driving module including a driving motor, disposed at the tub, for washing the laundry by rotating the drum;
a water supply module for supplying washing water to the outer tub;
a drainage module for draining the washing water stored in the outer tub to the outside of the casing.
As described in the background art, in the prior art, the coupling voltage of the series motor is likely to cause the wrong detection of the state of the door lock of the washing machine, thereby reducing the reliability of the door lock control.
The embodiment of the present application provides a washing machine door lock control circuit, which is applied to the above washing machine, as shown in fig. 1, the circuit includes a door lock control unit 100, a motor control unit 200, and a controller 300, the motor control unit 200 further includes a reverse rotation control unit 201 and a forward rotation control unit 202, a first end of the reverse rotation control unit 201 is connected to a first end of the controller 300, a first end of the forward rotation control unit 202 is connected to a second end of the controller 300, a common point of a second end of the reverse rotation control unit 201 and a second end of the forward rotation control unit 202 is connected to a first end of the door lock control unit 100, a second end of the door lock control unit 100 is connected to a third end of the controller 300, wherein,
the reverse rotation control unit 201 is configured to disconnect the first end of the door lock control unit 100 according to a first signal sent by the controller 300 when the washing machine finishes or suspends a preset operation program and meets a preset door opening condition;
the forward rotation control unit 202 is configured to disconnect the first end of the door lock control unit 100 according to a second signal sent by the controller 300 when the washing machine finishes or suspends the preset operation procedure and meets the preset door opening condition.
Specifically, in the operation process of the washing machine, in order to prevent the user from accidentally inserting a hand into the machine barrel to cause accidental injury, a door lock is usually installed on a door of the washing machine, and the door and the control panel seat are locked by the door lock to ensure the safety of the user. The preset operation course may include a preset washing course, a preset drying course, etc. The preset door opening condition can be determined according to the water level of the washing machine, the temperature in the barrel and the rotating speed of the driving motor. When the washing machine finishes or suspends the preset operation program and meets the preset door opening condition, the door of the washing machine can be opened, the controller 300 sends a first signal to the reverse rotation control unit 201, the reverse rotation control unit 201 cuts off the connection between the reverse rotation control unit 201 and the first end of the door lock control unit 100, meanwhile, the controller 300 sends a second signal to the forward rotation control unit 202, and the forward rotation control unit 202 cuts off the connection between the forward rotation control unit 202 and the first end of the door lock control unit 100, so that the coupling signal of a driving motor is prevented from entering the door lock control unit, and the reliability of door lock control is improved.
The reverse rotation control unit 201 is also used to control the driving motor of the washing machine to rotate in a first rotation direction, and the forward rotation control unit 202 is also used to control the driving motor of the washing machine to rotate in a second rotation direction.
In order to further improve the reliability of the DOOR LOCK control, in some embodiments of the present invention, as shown in fig. 2 and 4, the DOOR LOCK control unit 100 further includes a DOOR LOCK detection unit 101 and a DOOR LOCK driving unit 102, a first terminal DT _ DOOR _ LOCK of the DOOR LOCK detection unit 101 is a second terminal of the DOOR LOCK control unit, a second terminal L' of the DOOR LOCK detection unit 101 is a first terminal of the DOOR LOCK control unit, the first terminal of the DOOR LOCK driving unit is connected to the fourth terminal 45 of the controller, pin DR _ DOOR, and the second terminal of the DOOR LOCK driving power supply and the second terminal of the DOOR LOCK detection unit are further connected to the DOOR LOCK of the washing machine, respectively, wherein,
the door lock detection unit 101 is configured to send a square wave signal to the third terminal 48 of the controller 300 when the preset operation program is running, so that the controller 300 determines that the door lock of the washing machine is in a locked state; when the preset operation program is finished or suspended, a high level signal is sent to the third terminal 48 of the controller 300, so that the controller 300 determines that the washing machine door lock is not in the locking state.
The door lock driving unit 102 is configured to close a door lock driving signal according to the control signal sent by the controller 300 when the washing machine finishes or suspends the preset operation program and meets the preset door opening condition, so that the washing machine door lock exits the locked state.
Specifically, when the preset operation program runs, the second end L' of the door lock detection unit 101 is connected to the reverse rotation control unit 201 and the forward rotation control unit 202, and the door lock detection unit 101 sends a square wave signal to the third end 48 of the controller 300, so that the controller 300 determines that the door lock of the washing machine is in a locked state, otherwise, the controller 300 sends alarm information;
when the preset operation program is finished or suspended, the second end L' of the door lock detection unit 101 is not connected to the reverse rotation control unit 201 and the forward rotation control unit 202, and the door lock detection unit 101 sends a high level signal to the third end 48 of the controller 300, so that the controller 300 determines that the door lock of the washing machine is not in the locked state, otherwise, the controller 300 sends alarm information.
When the washing machine finishes or suspends the preset operation program and meets the preset door opening condition, the controller 300 sends a control signal to the door lock driving unit 102, so that the washing machine door lock exits the locking state.
In order to ensure the reliability of the reverse rotation control unit, in some embodiments of the present application, as shown in fig. 1 and 3, the third terminal of the reverse rotation control unit 201 and the fourth terminal of the reverse rotation control unit 201 are further connected to a driving motor 400 of the washing machine, respectively, the reverse rotation control unit 201 further includes a first resistor R1, a second resistor R2, a first transistor N1, a first diode D1, and a first relay K4, wherein,
a first terminal of the first resistor R1 is a first terminal of the inversion control unit 201, a second terminal of the first resistor R1 and a first terminal of the second resistor R2 are commonly connected to a base of the first transistor N1, the collector of the first triode N1 and the anode of the first diode D1 are connected in common to a first end of the coil of the first relay K4, a second terminal of the coil of the first relay K4 and a common junction point of the cathode of the first diode D1 are connected to a 12V dc power supply, the first terminal 4 of the switch of the first relay K4 is the third terminal of the reversal control unit, the second terminal 3 of the switch of the first relay K4 is the fourth terminal of the reversal control unit, the third terminal 5 of the switch of the first relay K4 is the second terminal of the reverse control unit, the common junction of the second end of the second resistor R2 and the emitter of the first transistor N1 is grounded.
Specifically, the driving motor 400 includes a stator coil and a rotor coil, and the third terminal of the reverse rotation control unit 201 and the fourth terminal of the reverse rotation control unit 201 are connected to the stator coil of the driving motor 400 of the washing machine, respectively.
In order to improve the reliability of the door lock control circuit, in some embodiments of the present application, the reverse rotation control unit 201 is specifically configured to:
when the first signal is received, the first terminal 4 of the switch of the first relay and the second terminal 3 of the switch of the first relay are turned on to cut off the connection with the first terminal L' of the door lock control unit.
In this embodiment, when the reverse rotation control unit 201 receives the first signal, the first end 4 of the switch of the first relay K4 and the second end 3 of the switch of the first relay K4 are turned on, so that the first relay K4 attracts each other, and the connection with the first end L' of the door lock control unit is cut off, thereby preventing the coupling signal of the driving motor from entering the door lock control unit.
In order to ensure the reliability of the forward rotation control unit, in some embodiments of the present application, as shown in fig. 3, the third terminal of the forward rotation control unit 202 and the fourth terminal of the forward rotation control unit 202 are further connected to the driving motor, respectively, the forward rotation control unit further includes a third resistor R3, a fourth resistor R4, a second transistor N2, a second diode D2, and a second relay K5, wherein,
a first end of the third resistor R3 is a first end of the forward rotation control unit, a second end of the third resistor R3 and a first end of the fourth resistor R4 are commonly connected to a base of the second transistor N2, the collector of the second triode N2 and the anode of the second diode D2 are connected in common to a first end of the coil of the second relay K5, a second terminal of the coil of the second relay K5 is connected to a common junction of the cathode of the second diode D2 to a 12V dc power supply, the first terminal 4 of the switch of the second relay K5 is the third terminal of the forward rotation control unit, the second terminal 3 of the switch of the second relay K5 is the fourth terminal of the forward rotation control unit, the third terminal 5 of the switch of the second relay K5 is the second terminal of the forward rotation control unit, the common junction of the second end of the fourth resistor R4 and the emitter of the second transistor N2 is grounded.
Specifically, the third end of the forward rotation control unit 202 and the fourth end of the forward rotation control unit 202 are connected to the stator coils of the driving motor, respectively.
In order to improve the reliability of the door lock control circuit, in some embodiments of the present application, the forward rotation control unit 202 is specifically configured to:
when receiving the second signal, the first terminal 4 of the switch of the second relay K5 and the second terminal 3 of the switch of the second relay K5 are turned on to cut off the connection with the first terminal L' of the door lock control unit.
In this embodiment, when the forward rotation control unit 202 receives the second signal, the first end 4 of the switch of the second relay K5 and the second end 3 of the switch of the second relay K5 are turned on, so that the second relay K5 attracts each other, and the connection with the first end L' of the door lock control unit is cut off, thereby preventing the coupling signal of the driving motor from entering the door lock control unit.
In order to ensure the reliability of the door lock detecting unit, in some embodiments of the present invention, as shown in fig. 2, the door lock detecting unit 101 further includes a fifth resistor R41, a sixth resistor R39, a seventh resistor R44, an eighth resistor R42, a ninth resistor R43, a third transistor N6, a third diode D16, a fourth diode D30, a first capacitor C21, and a second capacitor C23, wherein,
first ends of the first capacitor C21 and the fifth resistor R41 are commonly connected to a first end DT _ DOOR _ LOCK of the DOOR LOCK detection unit, a second end of the fifth resistor R41 and a first end of the sixth resistor R39 are commonly connected to a collector of the third transistor N6, a second end of the sixth resistor R39 is connected to a 5V dc power supply, a first end of the second capacitor C23, a cathode of the third diode D16, a first end of the seventh resistor R44 and a first end of the eighth resistor R42 are commonly connected to a base of the third transistor N6, a second end of the eighth resistor R42 is connected to a first end of the ninth resistor R43, a second end of the ninth resistor R43 is connected to a cathode of the fourth diode D30, an anode of the fourth diode D30 is a second end L' of the DOOR LOCK detection unit, a second end of the first capacitor C21 is connected to ground, and an emitter of the third transistor N6 is connected to the third terminal N6, The common junction of the second end of the second capacitor C23, the anode of the third diode D16 and the second end of the seventh resistor R44 is grounded.
In order to improve the reliability of the door lock control circuit, in some embodiments of the present application, the door lock detection unit 101 is specifically configured to:
when the first terminal of the DOOR LOCK control unit 100 is not connected to the reverse rotation control unit 201 and the forward rotation control unit 202, the third transistor N6 is controlled to be turned off, so as to output a high level signal to the third terminal 48 of the controller 300 based on the first terminal DT _ DOOR _ LOCK of the DOOR LOCK detection unit 101.
In this embodiment, when the third transistor N6 is turned off, the first terminal DT _ DOOR _ LOCK of the DOOR LOCK detection unit 101 outputs a high level signal, so that the controller 300 receives a signal that the DOOR LOCK is reliably not in the locked state.
In order to improve the reliability of the door lock control circuit, in some embodiments of the present application, the controller 300 is further connected to a display screen, and the controller 300 is further configured to:
when a high level signal output by a first end DT _ DOOR _ LOCK of the DOOR LOCK detection unit 101 is received, controlling a preset DOOR LOCK icon on the display screen to be extinguished and switching to a preset end prompt mode;
the second terminal 3 of the switch of the first relay K4 and the third terminal 5 of the switch of the first relay K4 are turned on, and the second terminal 3 of the switch of the second relay K5 and the third terminal 5 of the switch of the second relay K5 are turned on to release the first relay K4 and the second relay K5.
When receiving a high level signal output by the first terminal DT _ DOOR _ LOCK of the DOOR LOCK detection unit 101, indicating that the DOOR LOCK exits the locked state, controlling the preset DOOR LOCK icon on the display screen to go out and shift to a preset end prompt mode, and releasing the relays K4 and K5. The preset ending prompt mode comprises the steps of sending out prompt sound and closing the display screen.
By applying the technical scheme, in a washing machine door lock control circuit comprising a door lock control unit, a motor control unit and a controller, the motor control unit further comprises a reverse rotation control unit and a forward rotation control unit, and the reverse rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a first signal sent by the controller when the washing machine finishes or suspends a preset operation program and meets a preset door opening condition; the forward rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a second signal sent by the controller when the washing machine finishes or pauses the preset operation program and accords with the preset door opening condition, and the coupling voltage transmission path of the driving motor is cut off when the washing machine finishes or pauses the preset operation program and accords with the preset door opening condition, so that the door lock control accuracy is improved, and the user experience is improved.
In order to further explain the technical idea of the utility model, combine specific application scene now, it is right to the technical scheme of the utility model explain.
As shown in fig. 2-4, the first relay K4 and the second relay K5 are used for controlling the rotor current direction of the driving motor in a single-switch manner, so as to realize the forward rotation and reverse rotation functions of the driving motor. After the preset operation program is finished, the first relay K4 and the second relay K5 are released, and the door lock signal is directly detected.
The door lock control process in the embodiment of the application comprises the following steps:
firstly, after a preset operation program is finished and the temperature, the water level and the rotating speed reach a preset DOOR opening condition, outputting a low level by a pin 45 DR _ DOOR of a main chip IC5 (namely a controller), removing a DOOR lock driving signal and enabling the washing machine DOOR lock to exit a locking state;
a 23 pin DR _ FZ of the main chip IC5 outputs a high level to enable the first relay K4 to be conducted, and a 24 pin DR _ ZZ of the IC5 outputs a high level to enable the second relay K5 to be conducted, so that a driving motor winding is cut off to be connected with a wiring harness at an L' position on the door lock detection unit 101;
the third triode N6 in the DOOR LOCK detection unit 101 is cut off, so that DT _ DOOR _ LOCK outputs reliable high level to 48 pins of the main chip IC 5; the main chip IC5 recognizes the valid door opening signal, the screen door lock icon is turned off, the END prompt (END, beep, screen off, etc.) is turned on, and the first relay K4 and the second relay K5 are released.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A washing machine door lock control circuit comprises a door lock control unit, a motor control unit and a controller, and is characterized in that the motor control unit further comprises a reverse rotation control unit and a forward rotation control unit, wherein the first end of the reverse rotation control unit is connected with the first end of the controller, the first end of the forward rotation control unit is connected with the second end of the controller, the common joint point of the second end of the reverse rotation control unit and the second end of the forward rotation control unit is connected with the first end of the door lock control unit, the second end of the door lock control unit is connected with the third end of the controller, wherein,
the reverse rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a first signal sent by the controller when the washing machine finishes or suspends a preset operation program and meets a preset door opening condition;
and the forward rotation control unit is used for cutting off the connection with the first end of the door lock control unit according to a second signal sent by the controller when the washing machine finishes or suspends the preset operation program and meets the preset door opening condition.
2. The circuit of claim 1, wherein the door lock control unit further comprises a door lock detection unit and a door lock driving unit, the first end of the door lock detection unit is the second end of the door lock control unit, the second end of the door lock detection unit is the first end of the door lock control unit, the first end of the door lock driving unit is connected to the fourth end of the controller, the second end of the door lock driving unit and the second end of the door lock detection unit are further connected to the door lock of the washing machine, respectively, wherein,
the door lock detection unit is used for sending a square wave signal to a third end of the controller when the preset operation program runs so as to enable the controller to determine that the door lock of the washing machine is in a locking state; sending a high level signal to a third terminal of the controller when the preset operation program is ended or suspended so that the controller determines that the washing machine door lock is not in the locking state;
and the door lock driving unit is used for closing a door lock driving signal according to a control signal sent by the controller when the washing machine finishes or suspends the preset operation program and meets the preset door opening condition so as to enable the washing machine door lock to exit the locking state.
3. The circuit of claim 1, wherein the third terminal of the reverse rotation control unit and the fourth terminal of the reverse rotation control unit are further connected to a driving motor of the washing machine, respectively, the reverse rotation control unit further comprises a first resistor, a second resistor, a first triode, a first diode, and a first relay, wherein,
the first end of the first resistor is the first end of the inversion control unit, the second end of the first resistor and the first end of the second resistor are connected to the base electrode of the first triode in a sharing mode, the collector electrode of the first triode and the anode of the first diode are connected to the first end of the coil of the first relay in a sharing mode, the second end of the coil of the first relay and the common junction of the cathode of the first diode are connected with a 12V direct-current power supply, the first end of the switch of the first relay is the third end of the inversion control unit, the second end of the switch of the first relay is the fourth end of the inversion control unit, the third end of the switch of the first relay is the second end of the inversion control unit, and the common junction of the second end of the second resistor and the emitter electrode of the first triode is grounded.
4. The circuit of claim 3, wherein the inversion control unit is specifically configured to:
and when the first signal is received, the first end of the switch of the first relay and the second end of the switch of the first relay are conducted to cut off the connection with the first end of the door lock control unit.
5. The circuit of claim 3, wherein the third terminal of the forward rotation control unit and the fourth terminal of the forward rotation control unit are further connected to the driving motor, respectively, the forward rotation control unit further comprises a third resistor, a fourth resistor, a second triode, a second diode, and a second relay, wherein,
the first end of the third resistor is the first end of the forward rotation control unit, the second end of the third resistor and the first end of the fourth resistor are connected to the base electrode of the second triode, the collector electrode of the second triode and the anode of the second diode are connected to the first end of the coil of the second relay, the second end of the coil of the second relay and the common junction of the cathode of the second diode are connected with a 12V direct-current power supply, the first end of the switch of the second relay is the third end of the forward rotation control unit, the second end of the switch of the second relay is the fourth end of the forward rotation control unit, the third end of the switch of the second relay is the second end of the forward rotation control unit, and the common junction of the second end of the fourth resistor and the emitter electrode of the second triode is grounded.
6. The circuit of claim 5, wherein the forward rotation control unit is specifically configured to:
and when the second signal is received, the first end of the switch of the second relay and the second end of the switch of the second relay are conducted to cut off the connection with the first end of the door lock control unit.
7. The circuit of claim 2, wherein the door lock detection unit further comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a third transistor, a third diode, a fourth diode, a first capacitor, and a second capacitor, wherein,
the first ends of the first capacitor and the fifth resistor are connected to the first end of the door lock detection unit, the second end of the fifth resistor and the first end of the sixth resistor are connected to the collector of the third triode in common, the second end of the sixth resistor is connected with a 5V direct current power supply, the first end of the second capacitor, the cathode of the third diode, the first end of the seventh resistor and the first end of the eighth resistor are connected to the base electrode of the third triode in common, a second end of the eighth resistor is connected to a first end of the ninth resistor, a second end of the ninth resistor is connected to a cathode of the fourth diode, an anode of the fourth diode is a second end of the door lock detection unit, the second end of the first capacitor is grounded, and the common junction of the emitter of the third triode, the second end of the second capacitor, the anode of the third diode and the second end of the seventh resistor is grounded.
8. The circuit of claim 7, wherein the door lock detection unit is specifically configured to:
and when the first end of the door lock control unit is not connected with the reverse rotation control unit and the forward rotation control unit, the third triode is controlled to be cut off so as to output a high-level signal to the third end of the controller based on the first end of the door lock detection unit.
9. The circuit of claim 8, wherein the controller is further coupled to a display screen, the controller further configured to:
and when a high-level signal output by the first end of the door lock detection unit is received, controlling a preset door lock icon on the display screen to be extinguished and switching to a preset end prompt mode.
10. A washing machine, comprising the washing machine door lock control circuit according to any one of claims 1 to 9, further comprising:
a housing provided with a door for putting in the washings;
an outer tub disposed inside the cabinet and storing washing water therein;
a drum arranged at the inner side of the outer barrel for accommodating the washings;
a driving module disposed in the tub for rotating the drum;
a water supply module for supplying the washing water to the outer tub;
a water draining module for draining the washing water stored in the outer tub.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022481110.8U CN214142940U (en) | 2020-10-30 | 2020-10-30 | Washing machine door lock control circuit and washing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022481110.8U CN214142940U (en) | 2020-10-30 | 2020-10-30 | Washing machine door lock control circuit and washing machine |
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| CN214142940U true CN214142940U (en) | 2021-09-07 |
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| CN202022481110.8U Active CN214142940U (en) | 2020-10-30 | 2020-10-30 | Washing machine door lock control circuit and washing machine |
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