Induction dimming circuit in high temperature environment
By designing a high-temperature sensing dimming circuit, the problems of shortened sensing distance and low signal-to-noise ratio under high temperature were solved, realizing large-angle sensing and automatic brightness adjustment, thus meeting the needs of intelligent devices in high-temperature environments.
Patent Information
- Application Number
- CN202522117965.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-30
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-09-30
AI Technical Summary
In high-temperature environments, the existing sensing dimming circuits suffer from shortened sensing distance and low signal-to-noise ratio, making it difficult to achieve a large-angle sensing range and failing to meet the energy-saving, comfort, and safety requirements of smart devices in high-temperature environments.
A high-temperature environment sensing dimming circuit was designed, including an output working voltage power supply circuit, a microcontroller, a power detection module, a power adjustment module, a brightness detection module, a sensing probe module, and a brightness adjustment module. By connecting specific electronic components and modules, large-angle sensing and automatic brightness adjustment are realized.
Human body sensing at long distances (e.g., 20 meters) is achieved in high-temperature environments (e.g., 35°C), ensuring stable operation of the equipment under high-temperature conditions and automatic dimming function.
Smart Images
Figure CN224935811U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of lighting circuits, specifically relating to a sensor dimming circuit for high-temperature environments. Background Technology
[0002] With the widespread adoption of the Internet of Things (IoT) and smart homes, the demand for smart devices that integrate lighting control and human body sensing has surged. These devices are widely used in corridors, courtyards, garages, warehouses, factory workshops, and other locations, requiring the ability to adjust lighting brightness based on ambient light and human activity to achieve energy savings, comfort, and safety. At high temperatures, small temperature differences and low signal-to-noise ratios drastically shorten the sensing distance, and achieving a large-angle sensing range is often difficult due to limitations in optical design. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sensing dimming circuit for high-temperature environments.
[0004] The technical solution adopted by this utility model to solve its technical problem is: A high-temperature environment-based inductive dimming circuit includes a power supply circuit for output operating voltage BAT, a microcontroller, a power detection module, a power adjustment module, a brightness detection module, a sensor probe module, and a brightness adjustment module. The microcontroller has pins 3, 4, 5, 9, 10, 11, 12, 15, and 16. A capacitor is connected between pins 5 and 12 of the microcontroller. Pin 5 and one end of the capacitor are connected to network label VCC. Pin 4 of the microcontroller is connected to network label CDS. Pin 10 of the microcontroller is connected to the network... The microcontroller is labeled DIM, pin 11 is connected to network labeled TIME, pin 12 and the other end of capacitor 1 are grounded, pin 15 is connected to network labeled PIR, and pin 16 is connected to network labeled DIST. The power detection module consists of resistors 16 and 17, and capacitor 15. One end of resistor 16, one end of resistor 17, and one end of capacitor 15 are connected to pin 3 of the microcontroller. The other ends of resistor 17 and capacitor 15 are grounded, and the other end of resistor 16 is connected to the operating voltage BAT. The power regulation module consists of resistors 18 and 19. One end of resistor 18 and one end of resistor 19 are connected to pin 9 of the microcontroller. The other end of resistor 18 is connected to network label VCC, and the other end of resistor 19 is grounded. The brightness detection module consists of resistor 10 and a phototransistor. Resistor 11 is connected to network label VCC, and the other end of resistor 10 and the collector of the phototransistor are connected to network label CDS. The emitter of the phototransistor is grounded. The sensing probe module consists of an ET-W digital probe. Pin 1 of the ET-W digital probe is connected to network label VCC, pin 2 of the ET-W digital probe is connected to network label PIR, and the ET-W digital... The probe's pin 3 is grounded; the brightness adjustment module consists of resistors 11, 12, and 13, potentiometer 1, potentiometer 2, and potentiometer 3. One end of resistor 11, one end of resistor 12, and one end of resistor 13 are connected to network label VCC. The sliding ends of potentiometer 1, potentiometer 2, and potentiometer 3 are grounded. The fixed end of potentiometer 1 and the other end of resistor 11 are connected to network label DIM. The fixed end of potentiometer 2 and the other end of resistor 12 are connected to network label TIME. The fixed end of potentiometer 3 and the other end of resistor 13 are connected to network label DIST.
[0005] Preferably, the microcontroller is a PFS122B.
[0006] Compared with the prior art, this utility model has the following advantages and effects: This circuit can achieve wide-angle sensing, automatically adjust brightness, and operate in high-temperature environments (such as 35°C). Even when the ambient temperature is close to human body temperature, it can stably achieve human body sensing at long distances (such as 20 meters). Attached Figure Description
[0007] Figure 1The circuit diagram for the microcontroller, power detection module, and power regulation module is shown in the example.
[0008] Figure 2 The circuit diagram for the brightness detection module is shown in the example.
[0009] Figure 3 The circuit diagram of the sensing probe module is shown in the example.
[0010] Figure 4 The circuit diagram for the brightness adjustment module is shown in the example.
[0011] The accompanying drawings, which are provided to further illustrate this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. Detailed Implementation
[0012] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0013] Example
[0014] like Figures 1-4 As shown, the sensing dimming circuit includes a power supply circuit for outputting the working voltage BAT, a microcontroller U2, a power detection module, a power adjustment module, a brightness detection module, a sensing probe module, and a brightness adjustment module.
[0015] like Figure 1 As shown, microcontroller U2 has pins 3, 4, 5, 9, 10, 11, 12, 15, and 16. A capacitor C1 is connected between pins 5 and 12 of microcontroller U2. One end of pin 5 and capacitor C1 is connected to network label VCC. Pin 4 is connected to network label CDS. Pin 10 is connected to network label DIM. Pin 11 is connected to network label TIME. The other end of pin 12 and capacitor C1 is grounded. Pin 15 is connected to network label PIR. Pin 16 is connected to network label DIST. Specifically, pin 3 of microcontroller U2 is used to detect battery level, pin 4 is used to detect ambient brightness, pin 9 of microcontroller U2, in conjunction with pins 5 and 12, is used for program burning; pin 9 of microcontroller U2 can also be used for power adjustment; pin 10 of microcontroller U2 is used for brightness adjustment; pin 11 of microcontroller U2 is used for time adjustment; pin 16 of microcontroller U2 is used for distance adjustment; and pin 15 of microcontroller U2 is used to input probe signals. In this embodiment, microcontroller U2 is a PFS122B.
[0016] like Figure 1 As shown, the power detection module consists of resistor R16, resistor R17, and capacitor R15. One end of resistor R16, one end of resistor R17, and one end of capacitor R15 are connected to pin 3 of microcontroller U2. The other ends of resistor R17 and capacitor R15 are grounded, and the other end of resistor R16 is connected to the operating voltage BAT. Specifically, the power detection module is suitable for low-voltage battery lighting fixtures, detecting power levels to adjust the PWM discharge curve to ensure longer operating time.
[0017] like Figure 1 As shown, the power adjustment module consists of resistor R18 (18) and resistor R19 (19). One end of resistor R18 and one end of resistor R19 are connected to pin U29 of the microcontroller. The other end of resistor R18 is connected to the network label VCC, and the other end of resistor R19 is grounded. This power adjustment module is suitable for high-power lighting fixtures and can adjust the power over a certain period based on the voltage to ensure temperature compliance during long-term operation.
[0018] like Figure 2 As shown, the brightness detection module consists of a resistor R1 and a phototransistor I / O. One end of resistor R1 is connected to network label VCC, the other end of resistor R1 and the collector of the phototransistor I / O are connected to network label CDS, and the emitter of the phototransistor I / O is grounded. Specifically, the brightness detection module uses a resistor of appropriate value connected in series with the phototransistor I / O to read the changes caused by light intensity using the series voltage divider principle.
[0019] like Figure 3 As shown, the sensing probe module consists of an ET-W digital probe PIR1. Pin 1 of the ET-W digital probe PIR1 is connected to network label VCC, pin 2 is connected to network label PIR, and pin 3 is grounded. Specifically, the sensing probe module uses the ET-W digital probe PIR1 to generate a sensing signal by inputting a voltage of 2.5V-5.5V. The ET-W digital probe PIR1 can achieve a maximum sensing range of 360 degrees.
[0020] like Figure 4As shown, the brightness adjustment module consists of resistors 11R11, 12R12, and 13R13, potentiometers RP1, RP2, and RP3. One end of resistor 11R11, one end of resistor 12R12, and one end of resistor 13R13 are connected to network label VCC. The sliding terminals of potentiometers RP1, RP2, and RP3 are grounded. The fixed terminal of potentiometer RP1 and the other end of resistor 11R11 are connected to network label DIM; the fixed terminal of potentiometer RP2 and the other end of resistor 12R12 are connected to network label TIME; and the fixed terminal of potentiometer RP3 and the other end of resistor 13R13 are connected to network label DIST. Specifically, the brightness adjustment module uses three potentiometers connected in series with three resistors, rotating within a 265° range to adjust the voltage.
[0021] In this embodiment, the specific parameters or models of each electronic component include: resistor R1 with a resistance of 130KΩ, resistor R11 with a resistance of 100KΩ, resistor R12 with a resistance of 100KΩ, resistor R13 with a resistance of 100KΩ, resistor R16 with a resistance of 200KΩ, resistor R17 with a resistance of 100KΩ, resistor R18 with a resistance of 200KΩ, resistor R19 with a resistance of 100KΩ, potentiometer RP1 with a resistance of 100KΩ, potentiometer RP2 with a resistance of 100KΩ, and potentiometer RP3 with a resistance of 100KΩ. The use of these parameters and models of each electronic component is only one preferred embodiment in this embodiment, but not only this one preferred embodiment.
[0022] The above description in this specification is merely illustrative of the present invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not depart from the content of this specification or exceed the scope defined in the claims, all of which shall fall within the protection scope of this invention.
Claims
1. A high-temperature environment-based inductive dimming circuit, comprising a power supply circuit for outputting operating voltage BAT, a microcontroller, a power detection module, a power adjustment module, a brightness detection module, a sensing probe module, and a brightness adjustment module, characterized in that: The microcontroller has pins 3, 4, 5, 9, 10, 11, 12, 15, and 16. A capacitor is connected between pin 5 and pin 12. One end of pin 5 and capacitor is connected to network label VCC. Pin 4 is connected to network label CDS. Pin 10 is connected to network label DIM. Pin 11 is connected to network label TIME. The other end of pin 12 and capacitor is grounded. Pin 15 is connected to network label PIR. Pin 16 is connected to network label DIST. The power detection module consists of resistor 16, resistor 17, and capacitor 15. One end of resistor 16, one end of resistor 17, and one end of capacitor 15 are connected to pin 3 of the microcontroller. The other end of resistor 17 and capacitor 15 are grounded. The other end of resistor 16 is connected to the working voltage BAT. The power regulation module consists of resistor 18 and resistor 19. One end of resistor 18 and one end of resistor 19 are connected to pin 9 of the microcontroller. The other end of resistor 18 is connected to the network label VCC, and the other end of resistor 19 is grounded. The brightness detection module consists of a resistor 10 and a phototransistor. One end of the resistor 11 is connected to the network label VCC, the other end of the resistor 10 and the collector of the phototransistor are connected to the network label CDS, and the emitter of the phototransistor is grounded. The sensing probe module consists of an ET-W digital probe, where pin 1 of the ET-W digital probe is connected to network label VCC, pin 2 of the ET-W digital probe is connected to network label PIR, and pin 3 of the ET-W digital probe is grounded. The brightness adjustment module consists of resistors 11, 12, and 13, as well as potentiometers 1, 2, and 3. One end of resistors 11, 12, and 13 is connected to network label VCC. The sliding terminals of potentiometers 1, 2, and 3 are grounded. The fixed terminal of potentiometer 1 and the other end of resistor 11 are connected to network label DIM. The fixed terminal of potentiometer 2 and the other end of resistor 12 are connected to network label TIME. The fixed terminal of potentiometer 3 and the other end of resistor 13 are connected to network label DIST.
2. The inductive dimming circuit under high temperature environment according to claim 1, characterized in that: The microcontroller is model PFS122B.