Microwave motion sensing device

Abstract

The utility model discloses a microwave motion inductive device, including circuit board, power interface, output interface, paster relay, circuit board has welded radio frequency module, radio frequency module electric connection has resistance module group and condenser module group, and power interface passes through triode and resistance module group and condenser module group and radio frequency module electric connection, and output interface and radio frequency module electric connection, and paster relay is welded on the circuit board, and paster relay is connected in parallel with triode, and paster relay passes through circuit board and resistance module group and condenser module group and radio frequency module electric connection, through triode to the power of power interface input plays the voltage stabilizing and current limiting effect, ensures radio frequency module and paster relay stable work, and the peak value and duration of surge current can be reduced with resistance module group, condenser module group, limit surge current size, improve radio frequency module and paster relay stable service life, and service life is long.

Description

Technical Field

[0001] This utility model relates to the field of motion sensing technology, specifically a microwave motion sensing device. Background Technology

[0002] Microwave motion sensing devices are intelligent detection equipment designed based on the Doppler radar principle. They are mainly used to detect the movement of objects and have the characteristics of strong penetration and excellent anti-interference ability. Their application scenarios include automatic lighting, automatic toilet lid opening, automatic doors, etc.

[0003] In related technologies, microwave motion sensing devices generate surge voltages and inrush currents in the power grid at the instant of switching on or off due to the inductance in the power grid. For microwave motion sensing devices that use relays as switching actuators, a huge surge current will be generated at the instant the relay's ground contact makes or breaks, as long as voltage and current are present. This large current not only interferes with other equipment in the power grid but also significantly shortens the lifespan of the relay, thus affecting the service life of the microwave motion sensing device. Utility Model Content

[0004] The purpose of this invention is to provide a microwave motion sensing device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a microwave motion sensing device, comprising a circuit board, wherein an radio frequency module is soldered on the circuit board, and the radio frequency module is electrically connected to a resistor module and a capacitor module through the circuit board;

[0006] The power interface is integrated on the circuit board. The power interface is electrically connected to the radio frequency module through a transistor, a resistor module, and a capacitor module. The radio frequency module detects moving people and objects through microwaves to achieve automated detection.

[0007] The output interface is integrated on the circuit board and is electrically connected to the radio frequency module through the circuit board. After the radio frequency module detects people and objects, it sends out an electrical signal through the output interface, which can provide a signal for other household appliances to work.

[0008] A surface mount relay is soldered onto a circuit board and connected in parallel with a transistor. The surface mount relay is electrically connected to an RF module through the circuit board, a resistor module, and a capacitor module. The surface mount relay also controls the load of an external electrical appliance.

[0009] The power interface supplies power to the RF module. After the RF module detects the movement of an object, it controls the operation of the surface-mount relay and controls the operation of electrical appliances through the output interface, thereby realizing the automatic operation of the electrical appliances.

[0010] Furthermore, the resistor module includes resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, and R11, and the capacitor module includes capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, and C10.

[0011] Furthermore, the circuit board integrates a grounding interface, which is electrically connected to the radio frequency module through a resistor R1, thereby improving the safety of power use.

[0012] Furthermore, the power interface and the transistor are provided with capacitor C10, and capacitors C8, C9 and resistor R11 are provided between the transistor and the RF module. Capacitors C8, C9 and R11 play a filtering and resonance role, and resistor R11 divides the voltage and limits the current to protect the RF module.

[0013] Furthermore, capacitors C4, C5, C6, and C7, and resistor R10 are provided between capacitor C9 and the surface mount relay. Together with the resistor module, they form a filter circuit to filter out noise in the microwave signal and participate in resonance to adjust the signal frequency and optimize the detection sensitivity.

[0014] Furthermore, resistors R8, C2, R9, C3, C1, R2, R3, R4, and R5 are provided between the surface mount relay and the radio frequency module to ensure stable operation of the surface mount relay and prevent it from being affected by surge current.

[0015] Furthermore, the radio frequency module is electrically connected to resistors R6 and R7 to prevent the radio frequency module from burning out due to high voltage.

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

[0017] (1) The transistor stabilizes and limits the current input to the power interface, ensuring stable operation of the RF module and surface mount relay. Combined with capacitor and resistor modules, it reduces the peak value and duration of surge current, limits the surge current magnitude, and extends the service life of the RF module and surface mount relay. Through signal conditioning and matching circuits composed of resistors, capacitors, and other components, microwave signals are filtered, amplified, and impedance matched, improving detection sensitivity and stability. For example, the filter capacitor effectively removes interference signals, making the reflected microwave signal received by the chip purer, thus more accurately determining whether motion has occurred.

[0018] (2) The radio frequency module utilizes the microwave Doppler effect to accurately detect the motion state of objects. Compared with infrared sensing and other methods, microwave sensing is not affected by environmental factors such as light, temperature, and humidity. It can work stably in dark, high-temperature or low-temperature environments, effectively detects the slight movements of people or objects, and is less prone to missed or false detections. It is suitable for complex and changeable environments such as warehouses and garages. Attached Figure Description

[0019] Figure 1 This is a schematic diagram showing the connection between the circuit board and various electronic components of this utility model;

[0020] Figure 2 This is a schematic diagram of the circuit board of this utility model.

[0021] In the diagram: 1. Circuit board; 2. RF module; 3. Power interface; 4. Output interface; 5. Ground interface; 6. Transistor; 7. Surface mount relay; 8. Capacitor module; 9. Resistor module. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Example:

[0024] Please see Figure 1-2 This utility model provides a technical solution: a microwave motion sensing device, including a circuit board 1, on which an radio frequency module 2 is soldered. The radio frequency module 2 is responsible for the transmission, reception and motion detection logic processing of microwave signals. The radio frequency module 2 is electrically connected to a resistor module 9 and a capacitor module 8 through the circuit board 1. The resistor module 9 is used for power filtering, signal coupling and high-frequency resonance. The resistor module 9 is used for signal voltage division, current limiting and impedance matching. The resistor module 9 and the capacitor module 8 can reduce the peak value and duration of surge current, limit the magnitude of surge current, and ensure the stable operation of the radio frequency module 2.

[0025] Power interface 3 is integrated on circuit board 1. Power interface 3 is electrically connected to RF module 2 through transistor 6, resistor module 9 and capacitor module 8. Power interface 3 is connected to DC power supply. The power first passes through transistor 6 (as a linear voltage regulator to stabilize the supply voltage), and then is filtered and current limited by resistor module 9 and capacitor module 8 before being delivered to RF module 2 to provide it with a stable operating voltage.

[0026] Output interface 4 is integrated on circuit board 1. The output interface 4 is electrically connected to radio frequency module 2 through circuit board 1. The external output terminal of the motion detection result of radio frequency module 2 transmits the detection signal (such as high and low level) of radio frequency module 2 to external electrical appliances (such as lamps and alarms).

[0027] The surface mount relay 7 is soldered onto the circuit board 1. The surface mount relay 7 is connected in parallel with the transistor 6. The surface mount relay 7 is electrically connected to the radio frequency module 2 through the circuit board 1, the resistor module 9, and the capacitor module 8. The surface mount relay 7 converts the weak current signal of the radio frequency module 2 into a strong current control signal to drive external electrical appliances.

[0028] Power interface 3 supplies power to RF module 2. After detecting the movement of an object, RF module 2 controls the operation of surface mount relay 7 and controls the operation of electrical appliances through output interface 4, thereby realizing the linkage control of external electrical appliances.

[0029] In this embodiment, as Figure 1 As shown, the resistor module 9 includes resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, and R11, and the capacitor module 8 includes capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, and C10.

[0030] In this embodiment, as Figure 1 As shown, the circuit board 1 integrates a grounding interface 5, which is electrically connected to the radio frequency module 2 through a resistor R1 to absorb interference signals such as electromagnetic radiation in the circuit and reduce interference to the radio frequency module 2.

[0031] In this embodiment, as Figure 1 As shown, the power interface 3 and the transistor 6 are equipped with capacitor C10 to filter out high-frequency noise introduced by the power supply. Between the transistor 6 and the RF module 2, there are capacitors C8 and C9 and resistor R11. Capacitors C8 and C9 are located between the transistor 6 and the RF module 2 and serve as filter capacitors to filter out residual noise in the output voltage of the transistor 6. At the same time, they utilize the energy storage characteristics of capacitors to provide a short-term energy replenishment to the RF module 2 when the power supply voltage fluctuates instantaneously (such as voltage drops caused by relay operation), ensuring its continuous and stable operation. Resistor R11 is a current-limiting resistor to precisely control the current flowing into the RF module 2, ensuring that it does not exceed the maximum rated current of the chip and avoid overcurrent damage.

[0032] In this embodiment, as Figure 1As shown, capacitors C4, C5, C6, C7, and resistor R10 are provided between capacitor C9 and surface mount relay 7. Capacitors C4, C5, C6, and C7 absorb back electromotive force, reducing electromagnetic interference to RF module 2 and other components, and can also filter out high-frequency noise when the relay is working. Resistor R10 limits the current flowing through the relay coil.

[0033] In this embodiment, as Figure 1 As shown, a resistor R8, a capacitor C2, a resistor R9, a capacitor C3, a capacitor C1, a resistor R2, a resistor R3, a resistor R4, and a resistor R5 are provided between the surface mount relay 7 and the radio frequency module 2. The capacitors C1, C2, and C3 prevent the DC potentials of the radio frequency module 2 and the relay from affecting each other. The resistors R2, R3, R4, and R5 provide a stable static voltage for the control pins of the radio frequency module 2. The resistors R8 and R9 limit the current of the control signal.

[0034] In this embodiment, as Figure 1 As shown, the radio frequency module 2 is electrically connected to resistors R6 and R7, which serve to perform impedance matching and signal conditioning.

[0035] Specifically, during use, the external DC power supply is connected through power interface 3, filtered by capacitor C10, and then regulated by transistor 6. The regulated voltage is filtered again by capacitors C8 and C9. Part of it is fed to surface-mount relay 7 after current limiting and filtering by resistor R10 and capacitors C4-C7, and the other part is fed to the power supply pins (pins 5 and 6) of RF module 2 after current limiting by resistor R11. At the same time, ground interface 5 is connected to RF module 2 through resistor R1 to form a complete power supply circuit, and all components enter standby mode.

[0036] After the RF module 2 is powered on, the internal oscillator starts to continuously transmit microwave signals. The microwave signal propagates outward. If there is no moving object in the range, the frequency of the reflected wave is the same as that of the transmitted wave. After being received by the RF module 2, there is no obvious frequency difference. If there is moving object (such as human movement), the frequency of the reflected wave will be shifted due to the Doppler effect. The shifted reflected wave will be received by the RF module 2.

[0037] The high-level trigger signal output by RF module 2 drives the surface mount relay 7 to power on. At the same time, the trigger signal of RF module 2 outputs a high level to the outside through output interface 4. After receiving the signal, the external electrical appliance works in conjunction with the closed state of the relay. When the movement ends, the output interface 4 returns to a low level, the relay contacts open, and the electrical appliance stops working.

[0038] 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 microwave motion sensing device, characterized in that, include: Circuit board (1), on which an RF module (2) is soldered, and the RF module (2) is electrically connected to a resistor module (9) and a capacitor module (8) through the circuit board (1). Power interface (3), the power interface (3) is integrated on the circuit board (1), the power interface (3) is electrically connected to the radio frequency module (2) through the transistor (6), the resistor module (9) and the capacitor module (8); Output interface (4), the output interface (4) is integrated on the circuit board (1), and the output interface (4) is electrically connected to the radio frequency module (2) through the circuit board (1); A surface mount relay (7) is soldered onto a circuit board (1). The surface mount relay (7) is connected in parallel with a transistor (6). The surface mount relay (7) is electrically connected to the radio frequency module (2) through the circuit board (1), a resistor module (9), and a capacitor module (8). The power interface (3) supplies power to the radio frequency module (2). After the radio frequency module (2) detects the movement of the object, it controls the surface mount relay (7) to run and controls the electrical appliances to work through the output interface (4).

2. The microwave motion sensing device according to claim 1, characterized in that: The resistor module (9) includes resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, and R11. The capacitor module (8) includes capacitors C1, C2, C3, C4, C5, C6, C7, C8, C9, and C10.

3. The microwave motion sensing device according to claim 2, characterized in that: The circuit board (1) integrates a ground interface (5), which is electrically connected to the radio frequency module (2) through a resistor R1.

4. A microwave motion sensing device according to claim 2, characterized in that: The power interface (3) and the transistor (6) are provided with capacitor C10, and capacitors C8, C9 and resistor R11 are provided between the transistor (6) and the radio frequency module (2).

5. A microwave motion sensing device according to claim 4, characterized in that: The capacitor C9 is connected to the surface mount relay (7) by capacitors C4, C5, C6, C7 and resistor R10.

6. A microwave motion sensing device according to claim 2, characterized in that: The patch relay (7) and the radio frequency module (2) are provided with resistor R8, capacitor C2, resistor R9, capacitor C3, capacitor C1, resistor R2, resistor R3, resistor R4, and resistor R5.

7. A microwave motion sensing device according to claim 2, characterized in that: The radio frequency module (2) is electrically connected to resistors R6 and R7.

Images