Safe flashlight

Abstract

The utility model discloses a safe flashlight. In order to solve the problem that potential safety hazards are easily caused by the fact that an existing flashlight lacks the functions of safe unlocking and power self-adjusting, a power self-adjusting loop is adopted to receive stress values and direction signals transmitted by an inductor set integrated in the flashlight, and the power of the flashlight is adjusted; the lock control loop receives an operation signal of a lock control button arranged on the outer surface of the flashlight and controls the operation state of the functional switch, an unlocking button and a gravity sensing function are added on the flashlight, the technical effects of automatically adjusting the power of the flashlight and preventing mistaken touch are achieved, and safety accidents are reduced.

Description

Technical Field

[0001] The utility model relates to the field of lighting equipment, in particular to a safety flashlight. Background Art

[0002] Existing flashlight designs have been greatly improved in terms of convenience and functionality, but there are still some hidden dangers in terms of safety. One of the most notable problems is the lack of a safety unlocking function. When the flashlight is not in use, if the switch is accidentally touched, especially when the flashlight lumen is set very high, the flashlight will immediately start and release a lot of heat. This will not only consume the battery power, but more importantly, long-term high temperature may cause damage to the flashlight's internal components and may even cause safety accidents such as fire. Therefore, adding a safety unlocking function to the flashlight is an important measure to ensure safe use and avoid potential dangers.

[0003] For example, a "multifunctional high-power LED dimming flashlight" disclosed in Chinese patent documents, with announcement number CN200982536Y, includes a head assembly, a light source assembly, a neck, a body and a back seat connected to each other to form an integral body, the light source assembly is a bare light emitting diode chip with a power of not less than 1W mounted on an aluminum-based printed circuit board heat sink, and an optical lens is provided at the light outlet of the light emitting diode; a middle partition is provided in the middle of the neck, and the aluminum-based printed circuit board heat sink is inserted into the middle partition; a control circuit board is installed between the middle partition and the battery box, and positive and negative electrodes are drawn out from the aluminum-based printed circuit board heat sink, and the positive and negative electrodes are connected to the control circuit board by wires, and a switch button is provided on the control circuit board. It can only be adjusted manually through the switch, and automatic adjustment cannot be achieved, and there are still safety hazards. Summary of the invention

[0004] The utility model mainly solves the problem that the existing flashlights lack the function settings of safety unlocking and power self-adjustment, which makes the flashlights easy to cause safety hazards; it provides a safety flashlight, which adds an unlocking button to the flashlight. Only when the unlocking button is unlocked, the switch control button of the flashlight can switch the function. A gravity sensing function is added to the circuit board of the flashlight. When the flashlight is placed in the Z direction, the power of the flashlight is automatically reduced, the light becomes dim, and the heat generated by the flashlight is reduced, so as to prevent a large amount of heat from being generated when placed, causing the desktop to heat up, catch fire, and other safety accidents.

[0005] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0006] The utility model includes a control circuit provided with a microcontroller, and the control circuit includes: a power self-regulating circuit, which receives stress value and direction signal transmitted by a sensor group integrated inside the flashlight, and adjusts the power of the flashlight; a lock control circuit, which receives an operation signal of a lock control button arranged on the outer surface of the flashlight, and controls the operation state of the functional switch.

[0007] A lock control circuit is introduced, which controls the operating state of the functional switch by receiving the operation signal of the lock control button set on the outer surface of the flashlight. This means that when the flashlight is not in use, even if the switch is accidentally touched, the flashlight will not start immediately due to the action of the lock control circuit, thus avoiding unnecessary power consumption and potential safety hazards. The power self-regulation circuit in the control circuit can receive the stress value and direction signal transmitted by the sensor group integrated inside the flashlight. According to these signals, the circuit can intelligently adjust the power output of the flashlight.

[0008] Preferably, in the lock control circuit, one of the microcontroller output pins is connected to the lock control switch, and several output pins are respectively connected to the LED load light group to form a lock circuit; several input pins of the microcontroller are respectively connected to the functional switch to form a control circuit with the LED load; the lock control switch is turned on, the functional switch is short-circuited, the lock control switch is cut off, and the functional switch is turned on. The lock control circuit design realizes safe locking to ensure that the flashlight is not started intentionally. When the lock control switch is turned off, the functional switch is normal; when it is turned on, the functional switch fails, which improves the safety of use.

[0009] Preferably, in the locking circuit, the microcontroller receives the lock switch on signal, and the LED load output pin is closed; in the control circuit, the microcontroller receives the lock switch off signal, the LED load output pin is connected, and the control circuit is turned on. In the locking circuit, the microcontroller intelligently responds to the lock switch signal, turns off or connects the LED load, and ensures the safe use of the flashlight. The control circuit is flexibly turned on, which improves convenience and ensures that users can work or explore safely at night.

[0010] Preferably, the sensor group includes a gravity sensor and an acceleration sensor integrated inside the flashlight; in the power self-regulating loop, the receiving end of the microcontroller receives the stress value signal and the stress direction signal calculated by the sensor group, the microcontroller is connected to the transistor base, the transistor collector is connected to one end of the LED load, and the other end of the LED load is connected to the negative pole of the power supply. The sensor group monitors intelligently, and the microcontroller adjusts the power accurately. Gravity and acceleration sensing ensure that the brightness of the flashlight adapts to the environment, is safe and energy-saving, and has smarter operation.

[0011] Preferably, the transistor base receives a power reduction signal, the collector current decreases, and the LED load current decreases; the transistor base receives a power increase signal, the transistor collector current increases, and the LED load current increases. The brightness of the LED load can be flexibly adjusted by the power reduction and power increase signals received by the transistor base. This design not only achieves energy-saving effects, but also can adjust the brightness according to environmental requirements, providing a more comfortable and safe lighting experience, while improving the practicality and intelligence level of the flashlight.

[0012] Preferably, the acceleration sensor and the gravity sensor both establish a two-dimensional coordinate system with the horizontal direction as the base surface, and further establish a three-dimensional coordinate system along the direction perpendicular to the base surface on the basis of the two-dimensional coordinate system, obtain the angle and verticality between the stress and the vertical axis in the three-dimensional coordinate system, and obtain the stress direction signal and stress value signal. The three-dimensional coordinate system accurately captures the stress direction and value, realizes the intelligent adjustment of the flashlight power, ensures the lighting effect, and improves the safety and convenience of use.

[0013] Preferably, an overcurrent protection resistor group and an overheat protection resistor group are also provided in the power self-regulating circuit, and are connected to the transistor emitter. The overcurrent protection resistor group can effectively limit the current in the circuit to prevent damage to the LED lamp beads and other electronic components due to excessive current. The overheat protection resistor group can sense the temperature change in the circuit. When the temperature is too high, the power in the circuit is reduced by changing the resistance value, thereby preventing safety accidents caused by overheating of the circuit. The setting of these two groups of resistor groups not only protects the safety of the flashlight circuit, but also prolongs the service life of the flashlight, so that the flashlight can work stably and reliably in complex environments.

[0014] Preferably, the locking circuit is further provided with a current limiting resistor group connected between the microcontroller and the LED load. The current limiting resistor group is provided in the locking circuit, which can effectively limit the current between the microcontroller and the LED load, and prevent the LED lamp beads or the microcontroller from being damaged due to excessive current. This design not only enhances the safety of the flashlight, but also ensures the stable operation of the LED load, prolongs the service life of the flashlight, and provides users with a more reliable and safe lighting experience.

[0015] The beneficial effects of the utility model are:

[0016] 1. The utility model is a safety flashlight, which adds an unlock button to the flashlight. Only when the unlock button is unlocked, the switch control button of the flashlight can switch functions, thereby improving the safety of use and preventing accidental touches;

[0017] 2. The utility model provides a safety flashlight, which adds a gravity sensing function to the circuit board of the flashlight. When the flashlight is placed in a vertical downward direction, the power of the flashlight is automatically reduced, the light becomes dim, and the heat generated by the flashlight is reduced to prevent a large amount of heat from being generated when placed, causing the desktop to heat up, catch fire, and other safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a structure diagram of a safety flashlight control circuit. DETAILED DESCRIPTION

[0019] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0020] Embodiment 1:

[0021] A safety flashlight of this embodiment, such as Figure 1 As shown, it includes a control circuit with a microcontroller, and the control circuit includes: a power self-regulating circuit, which receives the stress value and direction signal transmitted by the sensor group integrated inside the flashlight, and adjusts the power of the flashlight; a lock control circuit, which receives the operation signal of the lock control button set on the outer surface of the flashlight, and controls the operating state of the functional switch.

[0022] To implement the logic of a total lock-controlled switch S1 controlling other functional switches S2, wherein when the lock-controlled switch S1 is connected, the other functional switches S2 are disconnected, and when the lock-controlled switch S1 is disconnected, the other functional switches S2 are turned on. This logic control can be implemented by a microcontroller U1.

[0023] In the lock control circuit, the specific connection relationship of the components is as follows:

[0024] Microcontroller U1: As the logic control center, it receives signals from the lock switch S1 and the functional switch S2, and controls the working state of the LED or other loads. Lock switch S1: Connected to an input pin of the microcontroller U1 (such as pin 2 in the figure) as the total control signal input. Functional switch S2: Connected to other input pins of the microcontroller U1 (such as pin 3 in the figure) to control specific functions or load LEDs. LED3, LED4, LED5, etc.: Connected to output pins 4 and 5 of the microcontroller U1, and controlled by the microcontroller U1 to turn them on and off. Transistor Q1: Used to drive load LEDs or other high-power loads, and its control end (Base / Gate) is connected to the output pin of the microcontroller U1. Resistors such as R2, R3, and R4: Used to limit current and protect LEDs and transistors.

[0025] The circuit logic of the lock control loop is:

[0026] For the lock switch S1: When the lock switch S1 is closed (i.e. the lock switch S1 is connected), the microcontroller U1 receives a control signal, and according to the programming logic, the microcontroller U1 will turn off the outputs of all load LEDs and other loads controlled by it. At this time, no matter what state the functional switch S2 is in, it will not affect the working state of the load LED or other loads, because the main lock switch S1 has cut off their control path.

[0027] For the functional switch S2: When the lock switch S1 is disconnected (i.e. the main lock switch is cut off), the microcontroller U1 no longer receives the control signal of the lock switch S1 and enters the normal working state. At this time, the state of the functional switch S2 will determine the working state of the load LED or other loads. For example, if the functional switch S2 is closed, the microcontroller U1 may light up a load LED according to the programmed logic.

[0028] The current trend and operating status of the lock control circuit are:

[0029] When the lock switch S1 is closed, the microcontroller U1 receives the control signal of the lock switch S1 and turns off the output of all load LEDs and other loads through its internal logic. The current will not flow through the load LEDs or other loads turned off by the microcontroller U1, but may flow through the internal circuit of the microcontroller U1 and the lock switch S1 itself.

[0030] When the lock switch S1 is disconnected and the functional switch S2 is working normally, the microcontroller U1 no longer receives the control signal of the lock switch S1 and enters the normal working state. If the functional switch S2 is closed, the microcontroller U1 will control the light of the load LED or other load according to its programming logic and the state of these switches. The current will flow through the output pin of the microcontroller U1, the load LED or other load, and possible current limiting resistors (such as R2, R3, etc.), and then flow back to the power supply.

[0031] In addition, it should be noted that the microcontroller U1 needs to be programmed, the appropriate input and output pins need to be set, and the corresponding control logic needs to be written to implement the above functions. At the same time, the stability of the power supply should be ensured to avoid voltage fluctuations from damaging the microcontroller and other components. Depending on the actual application scenario, it may be necessary to add safety protection circuits such as overcurrent protection and overheating protection. Select appropriate current limiting resistors according to the power requirements of the load LED or other loads to protect these components from damage.

[0032] For the lock control loop, ensure that the lock control switch S1 is connected to the input pin of the microcontroller U1 to receive the total lock signal. Connect the capability switch S2 to other input pins of the microcontroller U1. Connect the load LED or other load to the output pin of the microcontroller U1, and drive and protect it through the Q1 transistor and current limiting resistors (such as R2, R3, etc.). Modify the programming logic of the microcontroller U1 according to actual needs to ensure that the lock control switch S1 can correctly control the working status of other switches and load LEDs.

[0033] In order to realize the function of a safety flashlight that automatically reduces the power when the LED is placed downward and automatically increases the power when the LED is facing upward, we need a sensor that can detect the tilt angle of the flashlight, such as a gravity sensor or an accelerometer, and a circuit that works in conjunction with the microcontroller U1 and other circuit components.

[0034] The circuit elements of the power self-regulating loop design include:

[0035] Microcontroller U1: Responsible for receiving the signal from the sensor and controlling the power of the flashlight according to the signal. Gravity sensor / acceleration sensor: Detects the inclination angle of the flashlight, which is less than 3 degrees from the vertical direction and the internal stress of the gravity sensor is balanced, and outputs an analog or digital signal to the microcontroller U1. LED (such as LED10): The lighting LED of the flashlight, its brightness is controlled by the microcontroller U1. Transistor Q1: Acts as a switch or driver to control the on and off and brightness of the LED. R2: A resistor connected to the collector of transistor Q1, used to limit the current passing through transistor Q1. R7 or R6: A resistor connected to the base of transistor Q1, used to adjust the base current of transistor Q1, thereby controlling its output current. Power supply and battery: Provide power for the entire circuit.

[0036] The circuit working principle of the power self-regulating loop is:

[0037] During the automatic power reduction adjustment process, signal detection is first performed. When the flashlight is placed downward, the gravity sensor / accelerometer detects a specific tilt angle and outputs a signal to the microcontroller U1. Then signal processing is performed. After receiving the sensor signal, the microcontroller U1 determines that the current state of the flashlight is downward according to the preset logic and generates a control signal. To control the brightness of the LED, the microcontroller U1 controls the base current of the transistor Q1 (through R7 or R6), thereby controlling the collector current of the transistor Q1, that is, the current of the LED. When the microcontroller U1 outputs a low current or a shutdown signal, the collector current of the transistor Q1 decreases and the brightness of the LED decreases.

[0038] At this time, the current in the power regulation loop flows as follows: power supply → microcontroller U1 → R7 / R6 → transistor Q1 base → transistor Q1 collector → LED → power supply negative terminal. When the power is reduced, the current on R7 / R6 decreases, resulting in a decrease in transistor Q1 collector current and a decrease in LED brightness.

[0039] During the automatic power recovery adjustment process, signal detection is first performed. When the flashlight is placed upward, the gravity sensor / accelerometer detects another specific tilt angle and outputs a signal to the microcontroller U1. After receiving the sensor signal, the microcontroller U1 determines that the current state of the flashlight is upward and generates a control signal. The microcontroller U1 increases the base current of the transistor Q1 (through R7 or R6), thereby increasing the collector current of the transistor Q1, that is, the current of the LED. The LED brightness recovers.

[0040] At this time, the current flow in the power regulation loop is the same as when the power is reduced, but the current on R7 / R6 increases, causing the collector current of transistor Q1 to increase and the brightness of the LED to increase.

[0041] It should be noted that the choice of gravity sensor / accelerometer should be determined according to the specific needs of the flashlight and the tilt angle range. The programming logic of the microcontroller U1 needs to be written according to the output signal of the sensor to achieve correct power regulation. The brightness of the LED can be achieved by adjusting the base current of the transistor Q1, but care should be taken not to exceed the maximum operating current of the LED and the maximum allowable current of the transistor Q1. Additional protection circuits may be required in the circuit, such as overcurrent protection, overheating protection, etc., to ensure the safe operation of the flashlight.

[0042] In addition to the above-mentioned power self-regulation loop and lock control loop, Figure 1 The circuit also contains other components, the non-isolated buck chip U2, whose function is that U2 is usually used as a non-isolated buck chip on the circuit board. The main function of this chip is to reduce the input voltage to the required output voltage level to meet the voltage requirements of other components in the circuit. The advantages of U2 are its high performance and fast response (which may refer to fast response speed or stable performance), and it supports large current output, which is very important for circuits that require high power. Because U2 has these advantages, it is often used in the design of integrated computer host chips and consumer electronics.

[0043] It also includes an integrated circuit component U3, which is usually an integrated circuit component, that is, the entity of an integrated circuit. An integrated circuit is a circuit form that integrates multiple electronic components (such as transistors, resistors, capacitors, etc.) on a single chip. An integrated circuit is the physical reflection of such an integrated circuit. U3 can perform various functions, depending on its design and purpose. For example, it may be a microcontroller, an amplifier, a digital signal processor, etc. The role of U3 in the circuit depends on the specific task it is designed to perform.

[0044] The above circuit structure also contains many capacitor structures. Capacitors have multiple functions in the circuit, including decoupling, bypassing, energy storage and filtering; eliminating coupling interference between amplifiers at each stage and filtering out interference in the output signal; providing energy to local devices to make the output of the regulator uniform; capacitors are components that can store charge and release energy when needed; in power systems, capacitors are important components for improving power factor; in electronic circuits, capacitors are the main components for obtaining oscillation, filtering, phase shifting, bypassing, coupling and other functions.

[0045] In summary, U2, U3 and capacitor components all play an indispensable role in the circuit. They each have unique functions and advantages, and together ensure the stable operation and efficient performance of the circuit.

[0046] Embodiment 2:

[0047] A safety flashlight of this embodiment is further designed with a circuit structure based on the lock control loop of embodiment 1. In order to refine the circuit structure and integrate related components into the lock control loop, the circuit is designed according to the following contents: Select a microcontroller with sufficient I / O pins, logic processing capabilities and appropriate packaging. Assign a pin (such as pin 2) to the main lock switch S1. Assign a separate pin (such as pin 3, pin 4, etc.) to each functional switch (S2, S3, etc.). Assign one or more output pins to each LED or other load.

[0048] The circuit includes: Master lock switch S1: one end is connected to the input pin of the microcontroller (such as pin 2), and the other end is connected to the power supply or ground (depending on the switch type and circuit design). Functional switches S2, S3, etc.: one end of each switch is connected to the input pin of the microcontroller (such as pin 3, pin 4, etc.), and the other end is connected to the power supply or ground. LED or other load: the positive pole of each LED or other load is connected to the output pin of the microcontroller, and the negative pole is connected to the ground through a current limiting resistor. Transistor (Q1, Q2, etc.): for high-power LED or other load, use a transistor for driving. The base of the transistor is connected to the output pin of the microcontroller, the collector is connected to the positive pole of the LED or other load, and the emitter is connected to the ground. Current limiting resistor (R2, R3, R4, etc.): according to the specifications of the LED or other load and the power supply voltage, select the appropriate current limiting resistor value. One end of the resistor is connected to the positive pole of the LED or other load, and the other end is connected to the ground.

[0049] Provide stable power supply for microcontrollers, LEDs and other loads. According to the voltage and current requirements of the microcontroller and load, select a suitable power module or battery to add safety protection circuits such as overcurrent protection and overheating protection to prevent power fluctuations or abnormal loads from damaging the circuit. Add safety protection circuits such as overcurrent protection and overheating protection to prevent power fluctuations or abnormal loads from damaging the circuit. Program the microcontroller, set the input and output pins, and write the control logic to implement the logic of the main lock switch S1 to control other functional switches (S2, S3, etc.).

[0050] In the design of the lock control circuit of the safety flashlight, the circuit structure contains several key parts. The power supply provides power to the entire circuit and is turned on or off by the master lock switch (S1). This switch is directly connected to an input pin (such as pin 2) of the microcontroller (U1) to send a master lock signal to the microcontroller.

[0051] When the master lock switch (S1) is closed, it sends a signal to the microcontroller (U1), and the microcontroller turns off the output of all LEDs or other loads controlled by it according to the preset logic. This means that no matter what state other functional switches (such as S2, S3, etc.) are in, the LEDs or other loads will not work because the master lock switch (S1) has cut off their control path.

[0052] On other input pins of the microcontroller (such as pin 3, pin 4, etc.), we connected functional switches (S2, S3, etc.). These switches are used to control specific functions of the flashlight or turn the LED on and off. When the master lock switch (S1) is disconnected, the microcontroller no longer receives the master lock signal and enters normal working state. At this time, the state of the functional switch will determine the working state of the LED or other load.

[0053] To drive LEDs or other high-power loads, we use transistors (such as Q1, Q2, etc.). The bases of these transistors are connected to the output pins of the microcontroller (such as pin X, pin Y, etc.), the collectors are connected to the positive terminal of the LED or other load, and the emitters are connected to the ground. The microcontroller drives the LED or other load on and off by controlling the base level of the transistor.

[0054] We also add current limiting resistors (such as R1, R2, etc.) between the positive terminal of the LED or other load and the ground. These resistors are used to limit the current and protect the LED and transistor from damage. According to the specifications of the LED or other load and the power supply voltage, choose the appropriate current limiting resistor value.

[0055] Finally, the entire circuit is connected together through the ground wire to form a complete loop. When the ground wire connection is stable, the circuit can work properly. It should be noted that the stability of the power supply is crucial to the normal operation of the entire circuit, so it is necessary to select an appropriate power module or battery and ensure that voltage fluctuations do not cause damage to the microcontroller and other components.

[0056] In practical applications, the circuit needs to be further optimized and adjusted according to the specific needs and environmental conditions of the flashlight. For example, safety protection circuits such as overcurrent protection and overheating protection can be added to improve the safety and reliability of the circuit. At the same time, the microcontroller needs to be programmed, the appropriate input and output pins need to be set, and the corresponding control logic needs to be written to implement the various functions of the flashlight.

[0057] Embodiment 3:

[0058] A safety flashlight of this embodiment is further designed with a circuit structure based on the power self-regulating loop of embodiment 1. In order to refine the circuit structure and realize the power self-regulating function of the flashlight, it is necessary to integrate the gravity sensor / acceleration sensor, microcontroller (U1), LED, transistor (Q1) and other related components into a complete power self-regulating loop. The following is a further detailed description of the circuit structure.

[0059] U1 (microcontroller): As the control center of the entire circuit, it receives the signal from the gravity sensor / accelerometer and adjusts the brightness of the LED according to the signal. Gravity sensor / accelerometer: Detects the tilt angle of the flashlight and outputs an analog or digital signal to U1. LED (such as LED10): The lighting LED of the flashlight, the brightness is controlled by U1. Q1 (transistor): As the driver of the LED, it controls the current of the LED to adjust its brightness. R2: A current-limiting resistor connected in series with the LED to protect the LED from damage by excessive current. R7 / R6: A resistor connected to the base of Q1, used to adjust the base current of Q1, thereby controlling the brightness of the LED. Power supply and battery: Provide stable power for the entire circuit. Other protection circuits (such as overcurrent protection, overheating protection, etc.): Ensure the safe operation of the flashlight.

[0060] The working principle of the power reduction circuit is as follows: Signal detection: The gravity sensor / acceleration sensor detects the tilt angle of the flashlight when it is placed downward and outputs a signal to U1. Signal processing: After receiving the sensor signal, U1 determines that the flashlight is in a downward state and generates a control signal to reduce the brightness of the LED according to the preset logic. LED brightness control: U1 reduces the current output to the base of Q1 (through R7 / R6), thereby reducing the collector current of Q1 and reducing the current of the LED, thereby reducing the brightness of the LED. Current flow: power supply → U1 (control signal output) → R7 / R6 → Q1 base → Q1 collector → LED → R2 → power supply negative pole.

[0061] The working principle of the power recovery circuit is as follows: Signal detection: The gravity sensor / accelerometer detects the tilt angle of the flashlight when it is placed upward and outputs a signal to U1. After receiving the sensor signal, U1 determines that the flashlight is in an upward state and generates a control signal to increase the brightness of the LED according to the preset logic. LED brightness control: U1 increases the current output to the base of Q1 (through R7 / R6), thereby increasing the collector current of Q1 and increasing the current of the LED to recover the LED brightness. Current flow: The same as when the power is reduced, but the current on R7 / R6 increases, resulting in an increase in the collector current of Q1 and an increase in the brightness of the LED.

[0062] Sensor selection: Select the appropriate gravity sensor / accelerometer according to the specific needs of the flashlight and the tilt angle range. U1 programming: Write a program for the microcontroller so that it can correctly read the sensor's signal and adjust the LED brightness based on the signal. LED and Q1 specifications: Make sure that the LED and Q1 specifications meet the power and current requirements of the flashlight to avoid damaging the components or affecting the performance of the flashlight. Protection circuit: Add necessary protection circuits, such as overcurrent protection, overheating protection, etc., to improve the safety and reliability of the flashlight.

[0063] In the circuit, the gravity sensor / accelerometer is connected to an input pin of U1, the positive electrode of the LED is connected to the collector of Q1, and the base of Q1 is connected to an output pin of U1 through R7 / R6. The power supply provides power to the entire circuit and provides current limiting protection for the LED through R2. In addition, other necessary protection circuits and components need to be added to ensure the stable and safe operation of the flashlight.

[0064] It should be understood that the embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A safety flashlight, comprising a control circuit provided with a microcontroller, characterized in that: The control circuit includes: a power self-regulating circuit, which receives the stress value and direction signal transmitted by the sensor group integrated inside the flashlight, and adjusts the power of the flashlight; a lock control circuit, which receives the operation signal of the lock control button set on the outer surface of the flashlight, and controls the operation state of the functional switch; Wherein, the power self-regulating loop includes a microcontroller U1, which receives the signal from the sensor and controls the power of the flashlight according to the signal; wherein, the lock control loop includes a microcontroller U1, which receives the signal from the lock control switch S1 and the functional switch S2, and controls the working state of the LED or other loads.

2. A safety flashlight according to claim 1, characterized in that: In the lock control loop, one of the microcontroller output pins is connected to the lock control switch, and several output pins are respectively connected to the LED load light group to form a lock loop; several input pins of the microcontroller are respectively connected to the functional switch to form a control loop with the LED load; the lock control switch is turned on, the functional switch is short-circuited, the lock control switch is cut off, and the functional switch is turned on.

3. A safety flashlight according to claim 2, characterized in that: In the locking loop formed by the locking control loop, the microcontroller receives the locking switch on signal, and the LED load output pin is closed; in the control loop, the microcontroller receives the locking switch off signal, the LED load output pin is connected, and the control loop is turned on.

4. A safety flashlight according to claim 1, characterized in that: The sensor group includes a gravity sensor and an acceleration sensor integrated inside the flashlight; in the power self-regulating loop, the receiving end of the microcontroller receives the stress numerical signal and the stress direction signal calculated by the sensor group, the microcontroller is connected to the transistor base, the transistor collector is connected to one end of the LED load, and the other end of the LED load is connected to the negative electrode of the power supply.

5. A safety flashlight according to claim 4, characterized in that: When the transistor base receives a power reduction signal, the collector current decreases, and the LED load current decreases; when the transistor base receives a power increase signal, the transistor collector current increases, and the LED load current increases.

6. A safety flashlight according to claim 1 or 4, characterized in that: The acceleration sensor and gravity sensor in the sensor group establish a two-dimensional coordinate system with the horizontal direction as the base surface, and further establish a three-dimensional coordinate system along the direction perpendicular to the base surface on the basis of the two-dimensional coordinate system to obtain the angle and verticality between the stress and the vertical axis in the three-dimensional coordinate system, and obtain the stress direction signal and the stress value signal.

7. A safety flashlight according to claim 1 or 4, characterized in that: In the power self-regulating loop, an overcurrent protection resistor group and an overheat protection resistor group are also arranged and connected to the emitter of the transistor.

8. A safety flashlight according to claim 1, 2 or 3, characterized in that: In the locking loop formed by the locking control loop, a current limiting resistor group is also provided, which is connected between the microcontroller and the LED load.

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