Inductive switch control circuit
By introducing the induction switch control circuit of radar sensor and control unit into the control switch, the existing control switch has been solved, and stable and reliable control of the load is achieved, which reduces the occurrence of false triggering and adapts to a variety of environmental conditions.
Patent Information
- Application Number
- CN202421583823.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-05
AI Technical Summary
The existing control switch has poor sensitivity and reliability, and is easily disturbed by environmental noise, heat sources, light sources, radio frequency radiation, etc., and when the ambient temperature is close to the human body temperature, the detection sensitivity decreases, resulting in short-term failure.
An induction switch control circuit is adopted, including a voltage conversion unit, a radar sensor, a control unit and a switching circuit. The radar sensor detects the dynamic changes of moving objects and provides a trigger signal to the control unit. The control unit analyzes and processes the signals sent by the radar sensor, and outputs corresponding control signals to the switching circuit, thereby controlling the on-off of the switching circuit.
It realizes stable and reliable control of the load, reduces the occurrence of false triggering, is not affected by environmental conditions such as temperature, humidity, light, airflow, etc., and is widely applicable and suitable for the control of various application equipment.
Smart Images
Figure CN222750423U_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of practical energy-saving switches, and in particular to an induction switch control circuit. Background Art
[0002] As people's living standards gradually improve, traditional control switches are inconvenient to use in dark environments, and due to the lack of energy-saving awareness of some people, there is a situation where the switch is not turned off when people leave, which easily causes energy waste; the above defects can no longer meet people's demand for intelligent and energy-saving switches. Based on the above reasons, sound and light control switches and infrared sensor switches have gradually become popular in recent years.
[0003] However, the switch of the sound and light control panel is easily affected by the environmental noise, resulting in too high switching frequency, which can easily damage the lamp. What's more, it is often necessary to create a high-decibel sound to trigger the switch, which can easily cause noise pollution; similarly, the infrared sensor panel switch is easily affected by heat sources, light sources, radio frequency radiation, and thermal airflow. At the same time, the passive infrared has poor penetration, and the infrared radiation of the human body is easily blocked. Moreover, when the ambient temperature is close to the human body temperature, the sensitivity of the detection is significantly reduced, causing the setting to fail for a short time. Summary of the invention
[0004] In view of this, an object of the present invention is to provide an inductive switch control circuit to solve the problem of poor sensitivity and reliability of the existing control switch, while also being able to reduce the occurrence of false triggering.
[0005] The purpose of the utility model can be achieved through the following technical solutions: an induction switch control circuit, including a voltage conversion unit, a radar sensor, a control unit and a switch circuit, the input end of the voltage conversion unit is connected to the power input through an interface circuit, the output end of the voltage conversion unit is connected to the control unit, the radar sensor is connected to the signal input end of the control unit and provides a human body sensing signal, the signal output end of the control unit is connected to the switch circuit and controls the on and off of the switch circuit according to the signal sent by the radar sensor, and the switch circuit is used to be connected to a load.
[0006] The present invention detects dynamic changes of moving objects through a radar sensor and provides a trigger signal to a control unit. The control unit analyzes and processes the signal sent by the radar sensor and outputs a corresponding control signal to a switch circuit, thereby controlling the on and off of the switch circuit to achieve control of the load.
[0007] Preferably, the switch circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a driver chip and a MOS tube; the signal output end of the control unit is respectively connected to the first resistor and the second resistor, the other end of the first resistor is grounded, and the other end of the second resistor is connected to the signal input end of the driver chip; the signal output end of the driver chip is connected to the gate G of the MOS tube through the third resistor and is grounded through the fourth resistor at the same time, the power supply end of the driver chip is connected to the voltage conversion unit; the source S of the MOS tube is grounded, and the drain D of the MOS tube is used to be connected to the load.
[0008] Preferably, the driver chip is EG27517.
[0009] Preferably, the voltage conversion unit adopts the IC chip AP62200TWU-7 and its peripheral circuits, and the voltage conversion unit is used to realize 12V to 3.3V conversion.
[0010] Preferably, an overvoltage protection circuit is provided between the voltage conversion unit and the control unit, and between the voltage conversion unit and the switch circuit.
[0011] Preferably, the control unit adopts MCU chip STC8G1K08A.
[0012] Preferably, the control unit is also connected to an active control circuit, and the active control circuit adopts a button switch.
[0013] Preferably, the control unit is further connected to an indication circuit, and the indication circuit is used to indicate an action signal of the active control circuit.
[0014] Preferably, the radar sensor is a Doppler radar.
[0015] Compared with the prior art, the inductive switch control circuit has the following advantages: it uses Doppler sensing to detect objects in a non-contact manner and performs switch control on this basis; the detection is stable and reliable and is not affected by environmental conditions such as temperature, humidity, light, and airflow; it has good reliability and can be installed in a non-metallic casing of a certain thickness such as plastic, glass, or wood for protection; it has a wide range of applicability and is suitable for the control of various application equipment, environmental auxiliary light source control, underground parking lots, channel lighting, and other fields. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 is a principle block diagram of the induction switch control circuit in the embodiment.
[0017] Figure 2 The circuit diagram of the main control part of the induction switch control circuit in the embodiment is DETAILED DESCRIPTION
[0018] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
[0019] like Figure 1 As shown, the induction switch control circuit of the utility model includes a voltage conversion unit, a radar sensor, a control unit and a switch circuit. The input end of the voltage conversion unit is connected to the power input through the interface circuit, the output end of the voltage conversion unit is connected to the control unit, the radar sensor is connected to the signal input end of the control unit and provides a human body sensing signal, the signal output end of the control unit is connected to the switch circuit and controls the on and off of the switch circuit according to the signal sent by the radar sensor, and the switch circuit is used to connect to the load.
[0020] Specifically, Figure 2 As shown:
[0021] The voltage conversion unit includes the IC chip AP62200TWU-7 and its peripheral circuits. The 12V voltage input from the power interface first passes through the resistor R16, and then outputs a 12V voltage and is transmitted to the VIN port of the IC chip. After being converted to 3.3V by the IC chip, a 3.3V voltage is output. The 12V voltage is transmitted to the switch circuit through the overvoltage protection circuit 1, and the 3.3V voltage is transmitted to the control unit through the overvoltage protection circuit 2. The overvoltage protection circuit 1 is composed of a transient suppression diode U6 and a capacitor C4 connected in parallel therewith, and the overvoltage protection circuit 2 is composed of a transient suppression diode U1.
[0022] The radar sensor uses Doppler radar, which uses the Doppler effect to detect the position and relative speed of moving targets, so that it can accurately detect moving people and objects, providing a basis for accurate control of switches. The radar signal is input through the interface and transmitted to the radar signal input terminal of the control unit.
[0023] The control unit uses the MCU chip STC8G1K08A. The 3.3V voltage from the voltage conversion unit is first filtered by a filter circuit connected to the voltage input port Vcc of the MCU chip. The filter circuit is composed of capacitors C1, C2, C3 and C5 in parallel. The signal output CCP2_2 of the MCU chip outputs a control signal to the switch circuit to realize switch control. The signal input by the radar sensor is input to the MCU chip through the pin ECI_2. Pins P3.0 and P3.1 of the MCU chip are connected to the active control circuit and the indication circuit; the active control circuit is implemented by a button for manual control; the indication circuit is used to indicate the action signal of the active control circuit, which is composed of an indicator light LED1 in series with a resistor R6.
[0024] The switch circuit includes resistor R3, resistor R4, resistor R5, resistor R15, driver chip EG27517 and MOS tube Q2; the signal output by the control MCU chip is connected to resistor R3 and resistor R15 respectively, the other end of resistor R15 is grounded, and the other end of resistor R3 is connected to the signal input terminal IN+ of the driver chip EG27517; the signal output terminal OUT of the driver chip EG27517 is connected to the gate G of the MOS tube Q2 through the resistor R5 and is grounded through the resistor R4 at the same time, and the power supply terminal of the driver chip is connected to the voltage conversion unit; the source S of the MOS tube Q2 is grounded and the drain D is used to be connected to the load.
[0025] The inductive switch control circuit of the utility model can be built into various application equipment to achieve precise control, reduce interference from environmental factors, and has good practicality and applicability.
[0026] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.
Claims
1. An inductive switch control circuit, characterized in that: It includes a voltage conversion unit, a radar sensor, a control unit and a switch circuit. The input end of the voltage conversion unit is connected to the power input through an interface circuit, the output end of the voltage conversion unit is connected to the control unit, the radar sensor is connected to the signal input end of the control unit and provides a human body sensing signal, the signal output end of the control unit is connected to the switch circuit and controls the on and off of the switch circuit according to the signal sent by the radar sensor, and the switch circuit is used to be connected to a load.
2. The inductive switch control circuit according to claim 1, characterized in that: The switch circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a driver chip and a MOS tube; the signal output end of the control unit is respectively connected to the first resistor and the second resistor, the other end of the first resistor is grounded, and the other end of the second resistor is connected to the signal input end of the driver chip; the signal output end of the driver chip is connected to the gate G of the MOS tube through the third resistor and is grounded through the fourth resistor at the same time, the power supply end of the driver chip is connected to the voltage conversion unit; the source S of the MOS tube is grounded, and the drain D of the MOS tube is used to be connected to the load.
3. An induction switch control circuit according to claim 1 or 2, characterized in that: The voltage conversion unit adopts the IC chip AP62200TWU-7 and its peripheral circuits, and the voltage conversion unit is used to realize 12V to 3.3V conversion.
4. The inductive switch control circuit according to claim 3, characterized in that: An overvoltage protection circuit is provided between the voltage conversion unit and the control unit, and between the voltage conversion unit and the switch circuit.
5. An induction switch control circuit according to claim 1 or 2, characterized in that: The control unit adopts the MCU chip STC8G1K08A.
6. An inductive switch control circuit according to claim 1 or 2, characterized in that: The control unit is also connected to an active control circuit, and the active control circuit uses a button switch.
7. The inductive switch control circuit according to claim 6, characterized in that: The control unit is also connected to an indication circuit, and the indication circuit is used to indicate an action signal of the active control circuit.
8. An inductive switch control circuit according to claim 1 or 2, characterized in that: The radar sensor is a Doppler radar.