Head-mounted direct illuminating lamp

Abstract

The utility model relates to the technical field of lighting lamps, aims to solve the technical problem that an existing head-mounted direct lighting lamp cannot realize multi-section dimming, and discloses a head-mounted direct lighting lamp which comprises a battery and a single chip microcomputer, and the single chip microcomputer is connected with an LED lighting circuit, a battery voltage detection circuit and a charging circuit. The single-chip microcomputer is connected with a knob adjusting circuit used for adjusting the brightness of the LED lighting circuit, the knob adjusting circuit comprises a potentiometer CW and a resistor R2, the potentiometer CW is connected with the first fixed end, the adjusting end of the potentiometer CW, the single-chip microcomputer and one end of the resistor R2, the other end of the resistor R2 is input with a pull-up power supply, and the potentiometer CW and the second fixed end are grounded. And a capacitor C1 is connected in parallel between the potentiometer CW and the first fixed end and the second fixed end. By introducing a multi-section continuous dimming function, a user can conveniently adjust the brightness of the LED lighting circuit through the knob adjusting circuit according to actual lighting requirements, so that switching of different brightness levels is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting lamps, in particular to a head-mounted direct-illumination lamp. Background Art

[0002] In many environments that require lighting, such as basements, tunnels, mines or other darker workplaces, traditional fixed lamps cannot meet the needs of mobility, and handheld lamps will occupy both hands, limiting work efficiency. In order to provide convenient lighting in these scenarios, head-mounted lamps came into being. Head-mounted lamps are fixed to the head through a headband, and can adjust the lighting direction as the head moves, allowing users to free their hands during work and improve work efficiency and safety.

[0003] Rechargeable head-mounted lamps are particularly popular because they are not restricted by power cords and can be used anywhere, providing great flexibility. Head-mounted lamps are usually equipped with high-brightness LED lights and have a long battery life, which can meet the lighting needs of long-term work. Many head-mounted lamps are also waterproof, dustproof and impact-resistant, suitable for various harsh environments.

[0004] Although head-mounted lamps have significant advantages in providing portable lighting, there are still some problems that need to be improved. For example, the lamps on the market use ordinary chip control buttons or DIP switches, which cannot be dimmed in multiple stages or adjust the power. Long-term charging will cause swelling, output short circuit will cause fire and smoke, and there will be no power display. Utility Model Content

[0005] The utility model aims to provide a head-mounted direct-emitting lamp to solve the technical problem that the existing head-mounted direct-emitting lamp cannot be dimmed in multiple stages.

[0006] To achieve the above-mentioned purpose, the utility model provides a head-mounted direct-emitting lamp, including a battery and a single-chip microcomputer, the single-chip microcomputer is connected to an LED lighting circuit, a battery voltage detection circuit and a charging circuit, the single-chip microcomputer is connected to a knob adjustment circuit for adjusting the brightness of the LED lighting circuit, the knob adjustment circuit includes a potentiometer CW and a resistor R2, the potentiometer CW and a first fixed end are connected to its adjustment end, the single-chip microcomputer, and one end of the resistor R2, a pull-up power supply is input to the other end of the resistor R2, the potentiometer CW and the second fixed end are grounded, and a capacitor C1 is connected in parallel between the potentiometer CW and the first fixed end and the second fixed end.

[0007] By introducing the multi-stage continuous dimming function, users can conveniently adjust the brightness of the LED lighting circuit through the knob adjustment circuit according to actual lighting needs, thereby realizing the switching of different brightness levels. This design enables the head-mounted direct lighting fixture to provide appropriate lighting brightness in various usage environments, improving the flexibility and convenience of use. The combination of the battery voltage detection circuit and the charging circuit ensures the battery status monitoring and charging management of the lamp during use, avoids the problem of battery over-discharge and over-charging, and prolongs the battery life. The combination of potentiometer CW, resistor R2, and capacitor C1 not only realizes precise brightness adjustment, but also reduces the electrical noise interference in the circuit through the filtering effect of the capacitor, ensuring the smoothness and stability of the dimming process.

[0008] Furthermore, the LED lighting circuit includes an NMOS tube Q16, the drain of the NMOS tube Q16 is connected to the positive electrode of the battery through the LED component, the source of the NMOS tube Q16 is grounded through a current-sensing resistor, the source of the NMOS tube Q16 is connected to the single-chip microcomputer through a resistor R6, one end of the resistor R6 is connected to the source of the NMOS tube Q16, the gate of the NMOS tube Q16 is connected to the single-chip microcomputer through a resistor R11, and the gate of the NMOS tube Q16 is grounded through a resistor R10.

[0009] By introducing NMOS tube Q16 in the LED lighting circuit and using it as a switch control element, the brightness adjustment of the LED component is made more accurate and efficient. The drain of NMOS tube Q16 is connected to the LED component and the positive electrode of the battery, and the source is grounded through a current detection resistor to realize the detection of LED current, and then through the control of the single-chip microcomputer, the stable operation and efficient lighting of the LED are ensured.

[0010] The source of the NMOS tube Q16 is connected to the single-chip microcomputer through the resistor R6, and the gate is connected to the single-chip microcomputer through the resistor R11, so that the single-chip microcomputer can flexibly control the conduction state of the NMOS tube Q16, thereby adjusting the brightness of the LED component. The gate of the NMOS tube Q16 is grounded through the resistor R10, ensuring that the gate voltage can be quickly discharged in the off state to prevent leakage current from affecting circuit performance.

[0011] It not only improves the response speed and dimming effect of the LED lighting circuit, but also through the use of current-sense resistors, it can monitor and feedback current information in real time, so that the system can better protect the LED components and extend their service life.

[0012] Furthermore, a screen backlight circuit and a display circuit for displaying charging and battery information, and an LDO circuit for providing stable power to the screen backlight and the single-chip microcomputer are also provided. The LDO circuit includes a linear step-down module U4. The positive electrode of the battery and the positive electrode of the external input power supply are connected to the input end of the step-down module U4 through a diode D2 and a diode D1 respectively. The output end of the step-down module U4 is used to output a VCC_3V power supply to supply power to the single-chip microcomputer and the screen backlight. The ground end of the step-down module U4 is grounded.

[0013] By integrating the screen backlight circuit and display circuit, users can view the charging status and battery information in real time, improving the user experience and making it more convenient and intuitive to use.

[0014] The LDO circuit uses a linear step-down module U4 to stably step down the voltage of the battery and external input power supply to 3V (VCC_3V), and supply power to the microcontroller and screen backlight. The battery and external input power supply are connected through diodes D1 and D2 respectively to ensure stable power supply under different power input conditions.

[0015] Preferably, the charging circuit includes a charging module U2, a battery temperature detection input terminal of the charging module U2 is grounded; a charging current setting terminal of the charging module U2 is grounded through a resistor R12; a ground terminal of the charging module U2 is grounded; a power supply terminal of the charging module U2 is connected to one end of a charging interface J4, and the other end of the charging interface J4 is used to connect to the negative pole of the charger; a battery positive pole connection terminal of the charging module U2 is connected to the positive pole of the battery, and the negative pole of the battery is connected to the other end of the charging interface J4; a charging completion indication terminal and a battery charging indication terminal of the charging module U2 are respectively connected to the single-chip microcomputer; an enable terminal of the charging module U2 is connected to a power supply through a resistor R14.

[0016] The head-mounted direct-illumination lamp provided by the utility model has the following advantages:

[0017] The potentiometer CW and the resistor R2 form a series voltage divider circuit. When the potentiometer CW is rotated, the voltage at the adjustable end of the potentiometer CW changes and is detected by the microcontroller so that the microcontroller can adjust the brightness of the LED component through the LED lighting circuit. The potentiometer CW adjustment is continuous, and there will be no sudden changes in brightness at different gears.

[0018] The combination of potentiometer CW, resistor R2 and capacitor C1 not only achieves precise brightness adjustment, but also reduces electrical noise interference in the circuit through the filtering effect of the capacitor, ensuring the smoothness and stability of the dimming process. By introducing the multi-stage continuous dimming function, users can conveniently adjust the brightness of the LED lighting circuit by adjusting the circuit with a knob according to actual lighting needs, thereby achieving switching between different brightness levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a functional block diagram of the head-mounted direct-illumination lamp provided by the utility model;

[0020] Figure 2 The schematic diagram of the knob adjustment circuit provided by the utility model;

[0021] Figure 3 The LED lighting circuit schematic diagram provided by the utility model;

[0022] Figure 4 The battery voltage detection circuit schematic diagram provided by the utility model;

[0023] Figure 5 The charging circuit schematic diagram provided by the utility model;

[0024] Figure 6 This is a schematic diagram of an LDO circuit provided by the utility model. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] See also Figure 1 The utility model provides a head-mounted direct-illumination lamp, including a single-chip microcomputer, which is respectively connected to a knob adjustment circuit, an LED lighting circuit, a battery voltage detection circuit, a charging circuit, an LDO circuit, a screen backlight and a display circuit.

[0027] See also Figure 2 The knob adjustment circuit includes a potentiometer CW, which is connected in series with a resistor R2, which is connected in parallel with a capacitor C1, a first fixed end of the potentiometer CW is grounded, a second fixed end of the potentiometer CW is connected to the MCU_AD port of the microcontroller, an adjustable end of the potentiometer CW is connected to its second fixed end, and the resistor R2 is connected to the MCU_H port of the microcontroller. The potentiometer CW and the resistor R2 form a series voltage divider circuit. When the potentiometer CW is rotated, the voltage at the adjustable end of the potentiometer CW changes and is detected by the microcontroller so that the microcontroller can adjust the output through the LED lighting circuit.

[0028] See also Figure 3 The LED lighting circuit includes an NMOS tube Q16, a drain of the NMOS tube Q16 is connected to the positive electrode of the battery through the LED component, a source of the NMOS tube Q16 is grounded through a current-sense resistor, the source of the NMOS tube Q16 is connected to the MCU_LIGHT_I port of the microcontroller through a resistor R6, one end of the resistor R6 is connected to the source of the NMOS tube Q16, and the other end of the resistor R6 is grounded through a capacitor C3.

[0029] In one embodiment, the current sensing resistor is formed by four 1 ohm resistors R5 , R6 , R7 and R8 connected in parallel.

[0030] The gate of NMOS tube Q16 is connected to the MCU_LIGHT_PWM port of the microcontroller through resistor R11, and the gate of NMOS tube Q16 is grounded through resistor R10. The microcontroller controls the switching speed of NMOS tube Q16 by outputting PWM waves of different frequencies, thereby adjusting the current flowing between the drain and the source, so that the brightness of the LED component changes.

[0031] The PWM waveform parameters output by the microcontroller depend on Figure 1 The potentiometer CW is adjusted, so the brightness of the LED component can be adjusted by rotating the potentiometer CW. If the LED component is short-circuited, it can be detected by the microcontroller and the output can be turned off by the NMOS tube Q16.

[0032] See also Figure 4 The battery voltage detection circuit includes a resistor R3 and a resistor R4. One end of the resistor R3 is connected to the positive electrode of the battery, one end of the resistor R4 is grounded, the other end of the resistor R3 is connected to the other end of the resistor R4 and connected to the MCU_VBAT interface of the microcontroller, and the resistor R4 is also connected in parallel with a capacitor C2. The resistor R3 and the resistor R4 form a series voltage divider circuit, and the microcontroller determines the battery voltage by detecting the voltage divider. If there is a problem with the battery, it can be detected by the microcontroller through the series voltage divider circuit.

[0033] See also Figure 5 The charging circuit includes a charging module U2. The first end of the charging module U2 is a battery temperature detection input end, which is directly grounded; the second end of the charging module U2 is a charging current setting end, which is grounded through a resistor R12. The charging current can be set by adjusting the value of the resistor R12; the third end of the charging module U2 is a grounding end, which is directly grounded; the fourth end of the charging module U2 is a power supply end, which is connected to one end of the charging interface J4, and the other end of the charging interface J4 is used to connect the negative electrode of the charger. Capacitors C4 and C5 are provided between the fourth end of the charging module U2 and the other end of the charging interface J4; the fifth end of the charging module U2 is The positive connection terminal of the battery is connected to the positive electrode of the battery, the negative electrode of the battery is connected to the other end of the charging interface J4, and a capacitor C6 is arranged between the 5th terminal of the charging module U2 and the other end of the charging interface J4; the 6th terminal of the charging module U2 is the charging completion indication terminal, which is connected to the STDBY port of the single-chip microcomputer, and the 7th terminal of the charging module U2 is the battery charging indication terminal, which is connected to the CHRG port of the single-chip microcomputer; the 8th terminal of the charging module U2 is the enable terminal, which is connected to the DC_5V power supply through the resistor R14, and can also be connected to the GPIO port of the single-chip microcomputer to select different enable modes; the 9th terminal of the charging module U2 is grounded.

[0034] See also Figure 6 In order to provide a more stable power supply for the single-chip microcomputer, an LDO circuit is set, including a linear buck module U4. The positive electrode of the battery and the positive electrode of the external input power supply are connected to the input end of the buck module U4 through diodes D2 and D1 respectively. The output end of the buck module U4 is used to output VCC_3V power to supply power to the single-chip microcomputer and the screen backlight. The ground end of the buck module U4 is grounded. The output end of the buck module U4 is grounded through capacitors C8 and C9 respectively, and the input end of the buck module U4 is grounded through capacitor C7 for filtering.

[0035] In one embodiment of the present invention, the capacitor C8 is preferably 0.1uF, and the capacitors C7 and C9 are preferably 10uF.

[0036] The head-mounted direct-illumination lamp provided by the utility model has the following advantages:

[0037] The potentiometer CW and resistor R2 form a series voltage divider circuit. When the potentiometer CW is rotated, the voltage at the adjustable end will change and be detected by the microcontroller, so that the microcontroller can adjust the brightness of the LED component through the LED lighting circuit. Since the adjustment of the potentiometer CW is continuous, there will be no sudden changes in brightness at different gears.

[0038] The combination of potentiometer CW, resistor R2 and capacitor C1 not only achieves precise brightness adjustment, but also reduces the electrical noise interference in the circuit through the filtering effect of the capacitor, ensuring the smoothness and stability of the dimming process. By introducing the multi-stage dimming function, users can conveniently adjust the brightness of the LED lighting circuit by adjusting the circuit with the knob according to actual lighting needs, thereby achieving switching between different brightness levels. This design makes brightness adjustment more flexible and meets the needs of various lighting environments.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A head-mounted direct-illumination lamp, comprising a battery and a single-chip microcomputer, wherein the single-chip microcomputer is connected to an LED lighting circuit, a battery voltage detection circuit and a charging circuit, characterized in that: The single-chip microcomputer is connected to a knob adjustment circuit for adjusting the brightness of the LED lighting circuit. The knob adjustment circuit includes a potentiometer CW and a resistor R2. The potentiometer CW and a first fixed end are connected to its adjustment end, the single-chip microcomputer, and one end of the resistor R2. A pull-up power supply is input to the other end of the resistor R2. The potentiometer CW and the second fixed end are grounded. A capacitor C1 is connected in parallel between the potentiometer CW and the first fixed end and the second fixed end.

2. The head-mounted direct-illumination lamp according to claim 1, characterized in that: The LED lighting circuit includes an NMOS tube Q16, a drain of the NMOS tube Q16 is connected to the positive electrode of the battery through an LED component, a source of the NMOS tube Q16 is grounded through a current-sensing resistor, the source of the NMOS tube Q16 is connected to the single-chip microcomputer through a resistor R6, one end of the resistor R6 is connected to the source of the NMOS tube Q16, a gate of the NMOS tube Q16 is connected to the single-chip microcomputer through a resistor R11, and the gate of the NMOS tube Q16 is grounded through a resistor R10.

3. The head-mounted direct-illumination lamp according to claim 2, characterized in that: A screen backlight circuit and a display circuit for displaying charging and battery information, as well as an LDO circuit for providing stable power to the screen backlight and the single-chip microcomputer are also provided. The LDO circuit includes a linear step-down module U4. The positive electrode of the battery and the positive electrode of the external input power supply are connected to the input end of the step-down module U4 through a diode D2 and a diode D1 respectively. The output end of the step-down module U4 is used to output a VCC_3V power supply to supply power to the single-chip microcomputer and the screen backlight. The ground end of the step-down module U4 is grounded.

4. The head-mounted direct-illumination lamp according to claim 2, characterized in that: The charging circuit includes a charging module U2, a battery temperature detection input terminal of the charging module U2 is grounded; a charging current setting terminal of the charging module U2 is grounded through a resistor R12; and a ground terminal of the charging module U2 is grounded; The power supply end of the charging module U2 is connected to one end of the charging interface J4, and the other end of the charging interface J4 is used to connect to the negative pole of the charger; the battery positive connection end of the charging module U2 is connected to the positive pole of the battery, and the negative pole of the battery is connected to the other end of the charging interface J4; the charging completion indication end and the battery charging indication end of the charging module U2 are respectively connected to the single-chip microcomputer; the enable end of the charging module U2 is connected to the power supply through the resistor R14.

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