Door lock composite control circuit

Abstract

The utility model discloses a door lock composite control circuit which comprises a motor port, a door lock port, a power supply port, a detection port, a power supply module, a signal detection module, a level conversion module, an isolation module, a switch tube module, an intelligent power module and a three-phase inversion module. According to the technical scheme, the door closing and opening signals of the door lock port are detected through the signal detection module, the detection result is output outwards through the detection port, the level signal transmitted by the door lock port is converted through the level conversion module, and the switch tube module is driven through the isolation module. The switch tube module controls the electric connection between the power supply port and the intelligent power module according to a level signal of the door lock port; in practical application, when the door lock is opened, the driving power supply of the washing pump can be quickly disconnected, the washing pump is stopped immediately, safety accidents caused by high-temperature hot water spraying are prevented, and the scheme is safe and reliable in protection and extremely low in cost through multiple detection.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and more specifically to a door lock composite control circuit. Background Technology

[0002] As people's living standards improve, dishwashers have become a widely accepted kitchen appliance. Dishwashers using BLDC motors (brushless motors) are particularly popular due to their superior performance and energy efficiency. Dishwashers typically use high-temperature hot water for washing; if the dishwasher door is accidentally opened during the wash cycle, it can easily cause injury from the hot water jets. Therefore, door lock detection and control systems are crucial for preventing such accidents.

[0003] Currently, dishwasher door lock detection circuits on the market are generally divided into low-voltage control and high-voltage control. Low-voltage control disconnects the 12V power supply to the relay controlling the wash pump via the door lock, stopping the wash pump when the door is opened. High-voltage control disconnects the 220V power supply connected to the wash pump via the door lock, stopping the wash pump when the door is opened. Dishwashers use BLDC motors as wash pumps, and stopping the BLDC motor can only be achieved by sending communication data, which is not very secure. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a door lock composite control circuit.

[0005] The technical solution adopted by this utility model to solve the problem is:

[0006] A door lock composite control circuit includes a motor port, a door lock port, a power supply port, a detection port, a power module, a signal detection module, a level conversion module, an isolation module, a switching transistor module, an intelligent power module, and a three-phase inverter module;

[0007] The power supply module is connected to the level conversion module, the signal detection module, and the door lock port. The door lock port is connected to the signal detection module, the detection port is connected to the signal detection module, the signal detection module is connected to the level conversion module, the level conversion module is connected to the isolation module, the isolation module is connected to the switching transistor module, the switching transistor module is connected to the power supply port and the intelligent power module, the intelligent power module is connected to the three-phase inverter module, and the three-phase inverter module is connected to the motor port. In practical applications, the motor port is used to connect a washing pump equipped with a BLDC motor, the detection port is used to connect to the intelligent control chip, the door lock port is used to connect to the dishwasher's door lock assembly, and the power supply port is used to connect to an external power supply device.

[0008] As a further improvement to the above technical solution, the signal detection module includes a transistor Q1, resistors R1, R2, R3, and R4. The base of transistor Q1 is connected to the door lock port through resistor R1, the emitter of transistor Q1 is connected to ground, the two ends of resistor R2 are connected to the base and emitter of transistor Q1 respectively, the collector of transistor Q1 is connected to the detection port through resistor R4, and the collector of transistor Q1 is connected to the level conversion module through resistor R3.

[0009] As a further improvement to the above technical solution, the level conversion module includes a transistor Q2 and a resistor R5. The collector of the transistor Q1 is connected to the base of the transistor Q2 through the resistor R3. The emitter of the transistor Q2 is connected to the power supply module. The two ends of the resistor R5 are connected to the base and emitter of the transistor Q2 respectively. The collector of the transistor Q2 is connected to the isolation module.

[0010] As a further improvement to the above technical solution, the isolation module includes a control port, an optocoupler U1, and a resistor R6. The collector of the transistor Q2 is connected to the anode of the optocoupler U1, the cathode of the optocoupler U1 is connected to the control port or ground through the resistor R6, the emitter of the optocoupler U1 is connected to ground, and the collector of the optocoupler U1 is connected to the switching transistor module.

[0011] As a further improvement to the above technical solution, the switching module includes a switching transistor M1, resistors R7, R8, and R9. The collector of the optocoupler U1 is connected to the gate of the switching transistor M1 through resistors R7 and R8. The drain of the switching transistor M1 is connected to the intelligent power module. The source of the switching transistor M1 is connected to the power supply port. The source of the switching transistor M1 is connected to the connection point of resistors R7 and R8 through resistor R9.

[0012] The beneficial effects of this utility model are as follows: In this technical solution, the door opening and closing signals of the door lock port are detected by the signal detection module and the detection results are output to the outside through the detection port. The level conversion module converts the level signal transmitted by the door lock port and drives the switching tube module through the isolation module. The switching tube module controls the electrical connection between the power supply port and the intelligent power module according to the level signal of the door lock port. In practical applications, when the door lock is opened, the power supply to the washing pump can be quickly disconnected, so that the washing pump stops immediately and prevents high-temperature hot water from spraying out and causing safety accidents. This solution has undergone multiple tests, is safe and reliable, and has extremely low cost. Attached Figure Description

[0013] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a modular framework diagram of this utility model;

[0015] Figure 2 This is the circuit schematic diagram of this utility model. Detailed Implementation

[0016] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0017] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0020] Reference Figure 1 and Figure 2 This application discloses a door lock composite control circuit. Its first embodiment includes a motor port, a door lock port, a power supply port, a detection port, a power module, a signal detection module, a level conversion module, an isolation module, a switching transistor module, an intelligent power module, and a three-phase inverter module.

[0021] The power supply module is connected to the level conversion module, the signal detection module, and the door lock port. The door lock port is connected to the signal detection module, the detection port is connected to the signal detection module, the signal detection module is connected to the level conversion module, the level conversion module is connected to the isolation module, the isolation module is connected to the switching transistor module, the switching transistor module is connected to the power supply port and the intelligent power module, the intelligent power module is connected to the three-phase inverter module, and the three-phase inverter module is connected to the motor port. In practical applications, the motor port is used to connect a washing pump equipped with a BLDC motor, the detection port is used to connect to the intelligent control chip, the door lock port is used to connect to the dishwasher's door lock assembly, and the power supply port is used to connect to an external power supply device.

[0022] Specifically, in this embodiment, the signal detection module detects the door lock port's opening and closing signals and outputs the detection results through the detection port. The level conversion module converts the level signal transmitted through the door lock port and drives the switching module through the isolation module. The switching module controls the electrical connection between the power supply port and the intelligent power module based on the level signal of the door lock port. In practical applications, when the door lock is opened, the power supply to the washing pump can be quickly disconnected, causing the washing pump to stop immediately and preventing high-temperature hot water from spraying out and causing a safety accident. This solution has undergone multiple detections, is safe and reliable, and has extremely low cost.

[0023] As a further preferred embodiment, in this embodiment, the signal detection module includes an NPN transistor Q1, resistors R1, R2, R3, and R4. The base of transistor Q1 is connected to the door lock port through resistor R1, the emitter of transistor Q1 is connected to ground, the two ends of resistor R2 are connected to the base and emitter of transistor Q1 respectively, the collector of transistor Q1 is connected to the detection port through resistor R4, and the collector of transistor Q1 is connected to the level conversion module through resistor R3.

[0024] As a further preferred embodiment, in this embodiment, the level conversion module includes a PNP transistor Q2 and a resistor R5. The collector of transistor Q1 is connected to the base of transistor Q2 through the resistor R3. The emitter of transistor Q2 is connected to the power supply module. The two ends of the resistor R5 are connected to the base and emitter of transistor Q2 respectively. The collector of transistor Q2 is connected to the isolation module.

[0025] As a further preferred embodiment, in this embodiment, the isolation module includes a control port, an optocoupler U1, and a resistor R6. The collector of the transistor Q2 is connected to the anode of the optocoupler U1, the cathode of the optocoupler U1 is connected to the control port or ground through the resistor R6, the emitter of the optocoupler U1 is connected to ground, the collector of the optocoupler U1 is connected to the switching transistor module, and the control port is used to connect to the intelligent control chip.

[0026] As a further preferred embodiment, in this embodiment, the switching module includes a switching transistor M1, resistors R7, R8, and R9. The collector of the optocoupler U1 is connected to the gate of the switching transistor M1 through resistors R7 and R8. The drain of the switching transistor M1 is connected to the intelligent power module. The source of the switching transistor M1 is connected to the power supply port. The source of the switching transistor M1 is connected to the junction of resistors R7 and R8 through resistor R9.

[0027] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the concept of this utility model and the contents of the specification and drawings of this utility model, or direct or indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A door lock composite control circuit, characterized in that: It includes motor ports, door lock ports, power supply ports, detection ports, power modules, signal detection modules, level conversion modules, isolation modules, switching transistor modules, intelligent power modules, and three-phase inverter modules; The power supply module is connected to the level conversion module, the signal detection module, and the door lock port. The door lock port is connected to the signal detection module. The detection port is connected to the signal detection module. The signal detection module is connected to the level conversion module. The level conversion module is connected to the isolation module. The isolation module is connected to the switching transistor module. The switching transistor module is connected to the power supply port and the intelligent power module. The intelligent power module is connected to the three-phase inverter module. The three-phase inverter module is connected to the motor port.

2. The door lock composite control circuit according to claim 1, characterized in that: The signal detection module includes a transistor Q1, resistors R1, R2, R3, and R4. The base of transistor Q1 is connected to the door lock port through resistor R1, and the emitter of transistor Q1 is connected to ground. The two ends of resistor R2 are connected to the base and emitter of transistor Q1 respectively. The collector of transistor Q1 is connected to the detection port through resistor R4, and the collector of transistor Q1 is connected to the level conversion module through resistor R3.

3. The door lock composite control circuit according to claim 2, characterized in that: The level conversion module includes a transistor Q2 and a resistor R5. The collector of transistor Q1 is connected to the base of transistor Q2 through the resistor R3. The emitter of transistor Q2 is connected to the power supply module. The two ends of the resistor R5 are connected to the base and emitter of transistor Q2 respectively. The collector of transistor Q2 is connected to the isolation module.

4. A door lock composite control circuit according to claim 3, characterized in that: The isolation module includes a control port, an optocoupler U1, and a resistor R6. The collector of the transistor Q2 is connected to the anode of the optocoupler U1. The cathode of the optocoupler U1 is connected to the control port or ground through the resistor R6. The emitter of the optocoupler U1 is connected to ground. The collector of the optocoupler U1 is connected to the switching transistor module.

5. A door lock composite control circuit according to claim 4, characterized in that: The switching module includes a switching transistor M1, resistors R7, R8, and R9. The collector of the optocoupler U1 is connected to the gate of the switching transistor M1 through resistors R7 and R8. The drain of the switching transistor M1 is connected to the intelligent power module. The source of the switching transistor M1 is connected to the power supply port. The source of the switching transistor M1 is connected to the junction of resistors R7 and R8 through resistor R9.

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