Proximity switch based on Hall element

Abstract

The utility model discloses a proximity switch based on a Hall element, and belongs to the field of refrigerator door switches, a VDD interface end of a Hall element U4 is connected with one end of a power supply VCC and one end of a capacitor C12, an OUTPUT interface end of the Hall element U4 is connected with an input signal DOOR, the Hall element U4 comprises a reference power supply and a clock control module, the reference power supply is connected with an input end of a TMR sensor, and the clock control module is connected with an output end of the TMR sensor. The output end of the TMR sensor is connected with the Vbridge end of the filtering module, the vop end of the threshold selection module is connected with the Vref end of the filtering module, the output end of the filtering module is connected with the input end of the Schmitt trigger T, the output end of the Schmitt trigger T is connected with the output module, the output end of the output module is simultaneously connected with the base electrode of the MOS tube Q1 and the base electrode of the MOS tube Q2, and the output end of the MOS tube Q1 is connected with the output end of the output module. And the drain electrode of the MOS tube Q1, the drain electrode of the MOS tube Q2 and the OUTPUT interface end are mutually connected. According to the utility model, a reed switch is replaced by the Hall element, the physical structure of a magnetic corresponding component is effectively reduced, the probability of damage in the transportation and production process is reduced, and the cost is reduced by adopting a PCB patch form.

Description

Technical Field

[0001] The utility model relates to the field of refrigerator door switches, in particular to a proximity switch based on a Hall element. Background Art

[0002] As people's living standards improve, refrigerators have become a common household appliance. The working principle of the switch on the refrigerator door is based on the principle of circuit opening and closing. When the refrigerator door is closed, the contacts of the switch will touch each other, the circuit is closed, and the current can flow through the switch. At this time, the light bulb or other electrical equipment inside the refrigerator can work normally. When the refrigerator door is opened, the contacts of the switch are separated, the circuit is disconnected, and the current cannot pass through the switch, thereby cutting off the power supply to the electrical equipment. This can avoid wasting energy and causing safety hazards when the refrigerator door is opened.

[0003] The reed switch proximity switch used in traditional refrigerators is a power switch that can realize the on-off control between the two contacts of the reed switch by non-contact magnetic triggering. The proximity switch control function is realized by the change of magnetic field strength caused by the change of position of the magnet on the door seal when the door is opened and closed. In the normal production process, it is found that the proximity switch with reed switch structure has the disadvantages of poor detection sensitivity consistency, large PCB area occupied by reed switch and easy damage during transportation and installation. Utility Model Content

[0004] In view of some existing problems, the purpose of the present invention is to provide a proximity switch based on a Hall element to solve the problems raised in the above background technology.

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

[0006] A proximity switch based on a Hall element, comprising a Hall element U4, wherein a VDD interface end of the Hall element U4 is connected to a power source VCC and one end of a capacitor C12, and the other end of the capacitor C12 is grounded;

[0007] The GND interface terminal of the Hall element U4 is grounded;

[0008] The OUTPUT interface end of the Hall element U4 is connected to the input signal DOOR;

[0009] The Hall element U4 includes a reference power supply and a clock control module, the input end of the clock control module is electrically connected to the power supply VCC; the output end of the clock control module is connected to the threshold selection module, the power supply end of the Schmitt trigger T, and the output module;

[0010] The reference power supply is connected to the input end of the TMR sensor, and the output end of the TMR sensor is connected to the Vbridge end of the filter module;

[0011] The reference power supply is connected to the threshold selection module, and the vop terminal of the threshold selection module is connected to the Vref terminal of the filter module;

[0012] The output end of the filter module is connected to the input end of the Schmitt trigger T;

[0013] The output end of the Schmitt trigger T is connected to the input end of the output module;

[0014] The output end of the output module is connected to the base of the MOS tube Q1 and the base of the MOS tube Q2 at the same time;

[0015] The drain of the MOS tube Q1 and the drain of the MOS tube Q2 are connected to each other, and the drain of the MOS tube Q1 is connected to the OUTPUT interface terminal.

[0016] As a further solution of the utility model: the source of the MOS tube Q1 and the source of the MOS tube Q2 are grounded.

[0017] As a further solution of the utility model: the grounding terminals of the TMR sensor and the threshold selection module are grounded.

[0018] As a further solution of the utility model: the Hall element U4 patch is installed on a PCB board, an LED digital display screen is provided on the PCB board, the LED digital display screen is arranged on one side of the Hall element U4, three groups of lighting lights and nine groups of indicator lights are provided on the PCB board, multiple groups of buttons are provided on the PCB board, a buzzer is provided on the back of the PCB board, and a connector is provided on the PCB board.

[0019] As a further solution of the present invention: the models of the connector include but are not limited to JST, JAMI, CIB, molex, and HCB.

[0020] As a further solution of the utility model:

[0021] As a further solution of the utility model:

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] The utility model adopts Hall element to replace the reed switch. By using the Hall effect of semiconductor, when the overall structure of the proximity switch is unchanged, the magnet approaches or moves away from the port to output high and low levels according to the change of magnetic field when the door is opened or closed. When the door is opened or closed, the magnet approaches or moves away from the components to realize the switch control, effectively reducing the physical structure of the magnetic corresponding components and reducing the probability of damage during transportation and production. The PCB design is optimized, and the use of two chip resistors is reduced, which not only improves the consistency of the proximity switch detection sensitivity but also reduces the manufacturing cost.

[0024] The utility model optimizes the PCB design and adopts the form of PCB patch. The smaller volume enables it to be used in more products using proximity switches. Fewer patch resistors are used in the circuit design to reduce costs. The detection principle is the Hall effect of semiconductors, and the detection sensitivity and consistency are better than the magnetic control switch of the traditional reed switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The schematic diagram is a structural diagram of a proximity switch based on a Hall element.

[0026] Figure 2 The present invention is a schematic diagram of a circuit principle block diagram of a Hall element in a proximity switch based on a Hall element.

[0027] Figure 3 The figure is a schematic diagram of the installation of a proximity switch based on a Hall element in a PCB board.

[0028] Figure 4 for Figure 3 Side view of.

[0029] In the figure: 1. PCB board; 2. Light; 3. Connector; 4. LED digital display; 5. Button; 6. Indicator light; 7. Buzzer; U4, Hall element. DETAILED DESCRIPTION

[0030] 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 them. Based on the embodiments of 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.

[0031] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", and "connected" should be understood in a broad sense; for example, it can be a fixed connection, a detachable connection, or an integral connection, a mechanical connection, or an electrical connection, a direct connection, or an indirect connection through an intermediate medium, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0032] In order to improve the defects of the reed switch proximity switch, the utility model adopts the Hall element proximity switch solution. Currently, there are Hall switch circuits combined with programmable modules on the market, or other magnetic switches using metal Hall effect and programmed single-chip microcomputer chips, which are relatively expensive and are not realistic to be integrated on the display and control integrated board of low-end refrigerators;

[0033] See also Figure 1-4 , a proximity switch based on a Hall element, comprising a Hall element U4, a VDD interface end of the Hall element U4 is connected to a power source VCC and one end of a capacitor C12, and the other end of the capacitor C12 is grounded;

[0034] The GND interface terminal of the Hall element U4 is grounded;

[0035] The OUTPUT interface terminal of the Hall element U4 is connected to the DOOR input of the signal;

[0036] like Figure 2 As shown, the Hall element U4 includes a reference power supply and a clock control module, the input end of the clock control module is electrically connected to the power supply VCC; the output end of the clock control module is connected to the threshold selection module, the power supply end of the Schmitt trigger T, and the output module;

[0037] The reference power supply is connected to the input terminal of the TMR sensor, and the output terminal of the TMR sensor is connected to the Vbridge terminal of the filter module; the TMR sensor is a magnetic sensitive element that uses the tunnel magnetoresistance effect. By changing the external magnetic field, the resistance of the TMR sensor can be changed. The magnetoresistance effect is mainly used for the detection of magnetic fields.

[0038] The reference power supply is connected to the threshold selection module, and the vop terminal of the threshold selection module is connected to the Vref terminal of the filter module;

[0039] The output terminal of the filter module is connected to the T input terminal of the Schmitt trigger;

[0040] The output end of the Schmitt trigger T is connected to the input end of the output module;

[0041] The output end of the output module is connected to the base of MOS tube Q1 and the base of MOS tube Q2 at the same time;

[0042] The source of MOS tube Q1 and the source of MOS tube Q2 are grounded;

[0043] The drain of the MOS tube Q1 and the drain of the MOS tube Q2 are connected to each other, and the drain of the MOS tube Q1 is connected to the OUTPUT interface terminal;

[0044] The grounding terminals of the TMR sensor and threshold selection module are grounded; the Hall element U4 is used instead of the reed switch. By using the Hall effect of semiconductors, when the overall structure of the proximity switch remains unchanged, the magnet approaches or moves away from the port when the door is opened or closed, and the output high and low levels are output according to the change of the magnetic field. When the door is opened or closed, the magnet approaches or moves away from the components to realize the switch control, which effectively reduces the physical structure of the magnetic components and reduces the probability of damage during transportation and production.

[0045] The Hall element U4 chip is mounted on the PCB board 1 in the form of a PCB chip. Its small size allows it to be used in more products that use proximity switches. Fewer chip resistors are used in the circuit design to reduce costs.

[0046] like Figure 3-4 As shown, the PCB board 1 is provided with an LED digital display screen 4, which is arranged on one side of the Hall element U4. The LED digital display screen 4 is used to display numbers, so as to clearly display the temperature inside the refrigerator for people to check.

[0047] The PCB board 1 is provided with three groups of lighting lamps 2 and nine groups of indicator lights 6. The indicator lights 6 are convenient for indicating various working states of the refrigerator, and the lighting lamps 2 are convenient for lighting and are conducive to viewing.

[0048] A plurality of buttons 5 are provided on the PCB board 1, and the buttons 5 are convenient for people to adjust the refrigerator parameters later and facilitate the use of the device.

[0049] A buzzer 7 is provided on the PCB board 1. The buzzer 7 will sound an alarm when the refrigerator door is not closed for a long time, reminding the user to close the refrigerator door, which is beneficial to ensure that the refrigerator works well.

[0050] A connector 3 is provided on the PCB board 1. The models of the connector 3 include but are not limited to JST, JAMI, CIB, molex, HCB, etc., which facilitates the subsequent connection of the PCB board 1 to an external power supply and grounding.

[0051] The luminous flux of the whole board of the utility model is ≤90LM; the color temperature range is 6000-9000K; and an anti-static warning symbol is printed on the front of the PCB board 1.

[0052] PCB board 1 can withstand the neutral salt spray test (SS) 48b without obvious rust. The 9 indicator lights and 3 lighting lamps on the front of PCB board 1 need to be coated with high-transparency UV glue that meets environmental protection requirements. The glue should not affect the display effect of the LED lamp. Pay attention to avoid the key switch when applying glue to avoid affecting the key function after applying glue. At the same time, the thickness should not affect the subsequent assembly.

[0053] The utility model adopts Hall element to replace the reed switch. By using the Hall effect of semiconductor, when the overall structure of the proximity switch is unchanged, the magnet approaches or moves away from the port to output high and low levels according to the change of magnetic field when the door is opened or closed. When the door is opened or closed, the magnet approaches or moves away from the components to realize the switch control, effectively reducing the physical structure of the magnetic corresponding components and reducing the probability of damage during transportation and production. The PCB design is optimized, and the use of two chip resistors is reduced, which not only improves the consistency of the proximity switch detection sensitivity but also reduces the manufacturing cost.

[0054] The utility model optimizes the PCB design and adopts the form of PCB patch. The smaller volume enables it to be used in more products using proximity switches. Fewer patch resistors are used in the circuit design to reduce costs. The detection principle is the Hall effect of semiconductors, and the detection sensitivity and consistency are better than the magnetic control switch of the traditional reed switch.

[0055] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numerals in the claims should not be considered as limiting the claims involved.

[0056] In addition, it should be understood that although the present specification is described in accordance with implementation methods, not every implementation method includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A proximity switch based on a Hall element, characterized in that: It includes a Hall element U4, wherein a VDD interface end of the Hall element U4 is connected to a power source VCC and one end of a capacitor C12, and the other end of the capacitor C12 is grounded; The GND interface terminal of the Hall element U4 is grounded; The OUTPUT interface end of the Hall element U4 is connected to the input signal DOOR; The Hall element U4 includes a reference power supply and a clock control module, the input end of the clock control module is electrically connected to the power supply VCC; the output end of the clock control module is connected to the threshold selection module, the power supply end of the Schmitt trigger T, and the output module; The reference power supply is connected to the input end of the TMR sensor, and the output end of the TMR sensor is connected to the Vbridge end of the filter module; The reference power supply is connected to the threshold selection module, and the vop terminal of the threshold selection module is connected to the Vref terminal of the filter module; The output end of the filter module is connected to the input end of the Schmitt trigger T; The output end of the Schmitt trigger T is connected to the input end of the output module; The output end of the output module is connected to the base of the MOS tube Q1 and the base of the MOS tube Q2 at the same time; The drain of the MOS tube Q1 and the drain of the MOS tube Q2 are connected to each other, and the drain of the MOS tube Q1 is connected to the OUTPUT interface terminal.

2. A proximity switch based on a Hall element according to claim 1, characterized in that: The source of the MOS transistor Q1 and the source of the MOS transistor Q2 are grounded.

3. A proximity switch based on a Hall element according to claim 2, characterized in that: The grounding terminals of the TMR sensor and the threshold selection module are grounded.

4. A proximity switch based on a Hall element according to claim 3, characterized in that: The Hall element U4 patch is mounted on a PCB board (1); an LED digital display screen (4) is provided on the PCB board (1); the LED digital display screen (4) is arranged on one side of the Hall element U4; three groups of lighting lamps (2) and nine groups of indicator lights (6) are provided on the PCB board (1); a plurality of groups of buttons (5) are provided on the PCB board (1); a buzzer (7) is provided on the back of the PCB board (1); and a connector (3) is provided on the PCB board (1).

5. A proximity switch based on a Hall element according to claim 4, characterized in that: The models of the connector (3) include but are not limited to JST, JAMI, CIB, molex, and HCB.

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