Detection circuit for door opening and closing of electrical equipment

Abstract

The utility model relates to the technical field of door opening and closing of electrical equipment, in particular to a detection circuit for door opening and closing of electrical equipment, which comprises a power supply VCC for providing working voltage; the switching circuit comprises a first current limiting circuit, a reverse voltage preventing circuit and a switch; the input end of the first current limiting circuit is electrically connected with a power supply VCC, the input end of the first current limiting circuit is electrically connected with the output end of the reverse voltage prevention circuit, one end of the reverse voltage prevention circuit is electrically connected with one end of the switch, and the other end of the switch is grounded; the signal detection circuit comprises a second current limiting circuit, a filter circuit and an MCU module; the input end of the second current limiting circuit is electrically connected with the output end of the first current limiting circuit, the output end of the second current limiting circuit is electrically connected with one end of the filter circuit and an I / O port of the MCU module, and one end of the filter circuit is grounded.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment door opening and closing technology, specifically a detection circuit for electrical equipment door opening and closing. Background Technology

[0002] Door opening / closing detection of electrical equipment is a crucial step in ensuring the safe operation and reliable performance of these devices. Currently, various electrical appliances are increasingly widely used in people's daily lives. For example, if a microwave oven cannot accurately and reliably detect when the door is open during operation, the microwave function may not be shut off, leading to microwave leakage and other hazards. Similarly, in electrical equipment that requires the detection of the open and closed states of mechanical switches for functional control, inaccurate detection can cause malfunctions.

[0003] Therefore, there is a need to provide a detection circuit for the opening and closing of electrical equipment doors to solve this problem. Utility Model Content

[0004] This invention provides a detection circuit for opening and closing doors of electrical equipment to solve the above-mentioned problems.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A detection circuit for opening and closing doors of electrical equipment, comprising:

[0007] Power supply VCC, which is used to provide the operating voltage;

[0008] A switching circuit, comprising: a first current limiting circuit, a reverse voltage prevention circuit, and a switch; the input terminal of the first current limiting circuit is electrically connected to the power supply VCC, the input terminal of the first current limiting circuit is electrically connected to the output terminal of the reverse voltage prevention circuit, one end of the reverse voltage prevention circuit is electrically connected to one end of the switch, and the other end of the switch is grounded;

[0009] The signal detection circuit includes a second current limiting circuit, a filter circuit, and an MCU module. The input terminal of the second current limiting circuit is electrically connected to the output terminal of the first current limiting circuit. The output terminal of the second current limiting circuit is electrically connected to one end of the filter circuit and the I / O port of the MCU module. One end of the filter circuit is grounded.

[0010] As a preferred embodiment of this utility model, the first current limiting circuit is set as a resistor R1.

[0011] As a preferred embodiment of this utility model, the reverse voltage prevention circuit is configured as diode D1.

[0012] As a preferred embodiment of this utility model, the switch is configured as a mechanical switch SW.

[0013] As a preferred embodiment of this utility model, the second current limiting circuit is set as resistor R2.

[0014] As a preferred embodiment of this utility model, the filter circuit is configured as capacitor C1.

[0015] As a preferred embodiment of this utility model, the MCU module is set as a BF7612EM28 chip or a BF7612DM28 chip.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] In this invention, when the switch is closed, the power supply VCC forms a loop through the first current limiting circuit, the reverse voltage prevention circuit, and the switch. Additionally, a low-level signal is output to the IO port of the MCU module through the second current limiting circuit. If the MCU module detects the low level, it indicates that the switch closure of the electrical equipment is normal. When the switch is open, the power supply VCC outputs a high level to the IO port of the MCU module through the first and second current limiting circuits. If the MCU module detects the high level, it indicates that the switch closure of the electrical equipment is abnormal.

[0018] Meanwhile, the filtering circuit can filter out high-frequency noise. When the mechanical switch of the electrical equipment is repeatedly switched on and off, there will be no phenomenon of large current being injected or pulled out at the MCU module's IO port. It accurately detects the open and closed state of the electrical equipment's switch, ensuring the normal operation of the equipment. This design circuit structure is simple and accurately judges the open and closed state of the switch, thereby ensuring that it will not cause abnormal function of the equipment. Attached Figure Description

[0019] Figure 1 This is a block diagram of the circuit of this utility model;

[0020] Figure 2 This is the circuit schematic diagram of the present invention. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0022] For an example, please refer to... Figure 1 This utility model provides a technical solution:

[0023] A detection circuit for opening and closing doors of electrical equipment, comprising:

[0024] Power supply VCC1, which is used to provide the operating voltage;

[0025] A switching circuit, comprising: a first current limiting circuit 2, a reverse voltage prevention circuit 3, and a switch 4; the input terminal of the first current limiting circuit 2 is electrically connected to the power supply VCC1, the input terminal of the first current limiting circuit 2 is electrically connected to the output terminal of the reverse voltage prevention circuit 3, one end of the reverse voltage prevention circuit 3 is electrically connected to one end of the switch 4, and the other end of the switch 4 is grounded.

[0026] The signal detection circuit includes: a second current limiting circuit 5, a filter circuit 6, and an MCU module 7; the input terminal of the second current limiting circuit 5 is electrically connected to the output terminal of the first current limiting circuit 2, the output terminal of the second current limiting circuit 5 is electrically connected to one end of the filter circuit and the I / O port of the MCU module 7, and one end of the filter circuit 6 is grounded;

[0027] When switch 4 is closed, power supply VCC1 forms a loop through the first current limiting circuit 2, the reverse voltage prevention circuit 3, and switch 4. Additionally, a low-level signal is output to the I / O port of MCU module 7 via the second current limiting circuit 5. If MCU module 7 detects the low-level signal, it indicates that switch 4 is closed without any abnormality. When switch 4 is open, power supply VCC1 outputs a high-level signal to the I / O port of MCU module 7 via the first current limiting circuit 2 and the second current limiting circuit 5. If MCU module 7 detects the high-level signal, it indicates that switch 4 is closed under abnormal conditions.

[0028] Meanwhile, the filter circuit 6 can filter out high-frequency noise. When the switch 4 of the electrical equipment is repeatedly switched on and off, there will be no phenomenon of large current being injected or pulled out at the IO port of the MCU module 7. The open and closed states of the switch of the electrical equipment can be accurately detected to ensure the normal operation of the equipment. This design circuit structure is simple and accurately judges the open and closed states of the switch 4, thereby ensuring that the equipment will not malfunction.

[0029] Please refer to Figure 1 , Figure 2 In this embodiment, the first current limiting circuit 2 is set as a resistor R1, the reverse voltage prevention circuit 3 is set as a diode D1, the switch 4 is set as a mechanical switch SW, the second current limiting circuit 5 is set as a resistor R2, the filter circuit 6 is set as a capacitor C1, and the MCU module is set as a BF7612EM28 chip or a BF7612DM28 chip.

[0030] When the mechanical switch SW of the electrical equipment is closed, the connection point of resistor R1 and diode D1 outputs a low level to the IO port of MCU module 7 through resistor R2. MCU module 7 detects the low level and determines that the mechanical switch SW is closed.

[0031] When the mechanical switch SW of the electrical equipment is opened, the connection point of R1 and D1 outputs a high level to the IO port of MCU module 7 through resistor R2. MCU module 7 detects the high level and determines that the mechanical switch SW is in the open state.

[0032] Additionally, diode D1 prevents reverse voltage from entering the IO port of MCU module 7, resistor R2 limits current, and capacitor C1 filters out high-frequency noise. When the mechanical switch SW of the electrical equipment is repeatedly switched on and off, there will be no large current flowing into or out of the IO port of MCU module 7. This accurately detects the open and closed state of the mechanical switch SW of the electrical equipment, ensuring the normal operation of the equipment.

[0033] The working principle of this utility model is as follows:

[0034] 1. When switch 4 is closed, the power supply VCC1 forms a loop through the first current limiting circuit 2, the reverse voltage prevention circuit 3, and switch 4. Then, a low level is output to the IO port of MCU module 7 through the second current limiting circuit 5. If MCU module 7 detects the low level, it means that there is no abnormality in the closing of switch 4 of the electrical equipment.

[0035] 2. When switch 4 is open, power supply VCC1 outputs a high level to the IO port of MCU module 7 through the first current limiting circuit 2 and the second current limiting circuit 5. MCU module 7 detects the high level, which means that the switch 4 of the electrical equipment is in an abnormal state of being closed.

[0036] 3. At the same time, the filter circuit 6 can filter out high-frequency noise. When the switch 4 of the electrical equipment is repeatedly switched on and off, there will be no phenomenon of large current being injected or pulled out at the IO port of the MCU module 7. The open and closed status of the switch 4 of the electrical equipment can be accurately detected to ensure the normal operation of the equipment.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A detection circuit for detecting opening of a door of an electrical appliance, characterized by: include: Power supply VCC, which is used to provide the operating voltage; A switching circuit, comprising: a first current limiting circuit, a reverse voltage prevention circuit, and a switch; the input terminal of the first current limiting circuit is electrically connected to the power supply VCC, the input terminal of the first current limiting circuit is electrically connected to the output terminal of the reverse voltage prevention circuit, one end of the reverse voltage prevention circuit is electrically connected to one end of the switch, and the other end of the switch is grounded; The signal detection circuit includes a second current limiting circuit, a filter circuit, and an MCU module. The input terminal of the second current limiting circuit is electrically connected to the output terminal of the first current limiting circuit. The output terminal of the second current limiting circuit is electrically connected to one end of the filter circuit and the I / O port of the MCU module. One end of the filter circuit is grounded.

2. The detection circuit for opening and closing doors of electrical equipment according to claim 1, characterized in that: The first current limiting circuit is set as resistor R1.

3. The detection circuit for opening and closing doors of electrical equipment according to claim 1, characterized in that: The circuit for preventing reverse voltage is configured as diode D1.

4. A detection circuit for opening and closing doors of electrical equipment according to claim 1, characterized in that: The switch is a mechanical switch SW.

5. A detection circuit for opening and closing doors of electrical equipment according to claim 1, characterized in that: The second current limiting circuit is set as resistor R2.

6. A detection circuit for opening and closing doors of electrical equipment according to claim 1, characterized in that: The filter circuit is configured with capacitor C1.

7. A detection circuit for opening and closing doors of electrical equipment according to claim 1, characterized in that: The MCU module is set to either a BF7612EM28 chip or a BF7612DM28 chip.

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