A cigarette lighter device for realizing stable laser output

Abstract

This invention provides a cigarette lighting device that achieves stable laser output, relating to the field of semiconductor laser application technology. It includes a laser, a lithium battery, a boost regulator circuit, a constant current drive circuit, a timing control circuit, a first switch, and a second switch. The input terminal of the boost regulator circuit is connected to the lithium battery, and its output terminal is connected to the input terminal of the constant current drive circuit. The output terminal of the constant current drive circuit is connected to the laser. The output terminal of the timing control circuit is connected to the ground terminal of the constant current drive circuit. The first switch is located between the enable pin of the boost regulator circuit and the power supply, used to control the opening and closing of the boost regulator circuit. The second switch is connected to the trigger terminal of the timing control circuit, used to trigger the timing control circuit to output a signal. The cigarette lighting device provided by this invention can ignite tobacco within 2 seconds, with a power density approaching 1W / mm², far exceeding traditional laser ignition solutions.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor laser application technology, specifically to a cigarette lighting device that achieves stable laser output. Background Technology

[0002] The statements in this section are merely background information relating to this disclosure and do not necessarily constitute prior art.

[0003] Laser cigarette lighting technology is an environmentally friendly ignition method that uses the thermal effect generated by focusing a high-energy laser beam to ignite tobacco. Its principle is based on using a semiconductor laser emitted by a semiconductor laser, which is focused by an optical lens to form a high-energy-density spot, allowing the tobacco to reach its ignition point in a short time. Compared to traditional butane lighters, this technology has advantages such as no open flame, no fuel residue, and strong wind resistance, avoiding the environmental pollution problems caused by plastic casings and chemical fuels. However, existing laser cigarette lighting technology has the following significant drawbacks:

[0004] (1) The existing device uses a low-power laser of less than 1W, and the optical focusing design is not perfect, with a power density of less than 0.3W / mm. 2 This results in the tobacco taking more than 10 seconds to ignite. With low laser power, the only way to increase the laser power density is to compress the laser spot size. However, if the laser spot diameter is less than 1 mm, it is still impossible to quickly ignite the entire cigarette butt (which has a diameter greater than 5 mm).

[0005] (2) The lithium battery has poor power supply stability and lacks efficient power management. The output voltage of the lithium battery decreases with the amount of power. When directly driving the laser, the current fluctuates significantly, which leads to unstable laser power and inability to continuously output ≥2W of effective power.

[0006] (3) The existing device uses a single-stage switch to control the laser start and stop. After the user operates, the laser needs to be turned off manually. It is easy to forget and cause the laser to continue to work, which poses a safety hazard of overheating or accidental touch, reduces the life of the laser, and also causes the shell to overheat, affecting the grip. Utility Model Content

[0007] To address the aforementioned issues, this invention provides a cigarette lighter device that achieves stable laser output. Through the coordinated design of a boost voltage regulator circuit, a constant current drive circuit, and a timing control circuit, the lithium battery voltage is boosted and stabilized to the target value, and a constant current is output to drive a high-power laser. Combined with a collimating lens for optical focusing and a flip cover for laser shielding, this device enables rapid ignition of tobacco and provides safety protection.

[0008] This utility model provides a cigarette lighting device that achieves stable laser output, including: a laser emitting module, comprising a laser and a collimating lens connected to the optical path of the laser;

[0009] The power management module includes a lithium battery, a boost regulator circuit, and a constant current drive circuit; the input terminal of the boost regulator circuit is connected to the lithium battery, the output terminal of the boost regulator circuit is connected to the input terminal of the constant current drive circuit, and the output terminal of the constant current drive circuit is connected to the laser.

[0010] The control module includes a first switch S1, a second switch S2, and a timing control circuit; the first switch is connected in series with the enable terminal of the boost regulator circuit to control the on / off state of the boost regulator circuit; the second switch is connected to the trigger terminal of the timing control circuit, and the output terminal of the timing control circuit is connected to the switching device.

[0011] Furthermore, the boost regulator circuit includes a boost chip, an inductor L2, a capacitor C1, and a capacitor C2; the EN enable terminal of the boost chip is connected to one end of the first switch S1, and the other end of the first switch is connected to the lithium battery; the SW switching frequency control terminal of the boost chip is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to the VIN input terminal of the boost chip and the lithium battery; one end of the capacitor C1 is connected to the lithium battery, and the other end is grounded; the OUT output terminal of the boost chip is connected to one end of the capacitor C2, and the other end of the capacitor C2 is grounded; the AGND analog ground terminal and the PGND power ground terminal of the boost chip are both grounded.

[0012] Furthermore, the constant current drive circuit includes an FP7102 or FP7103 chip, an inductor L1, a diode D5, resistors R1 and R2, and capacitors C3, C4, C5, C6, and C7. The FB pin 1 of the FP7102 or FP7103 chip is connected to one end of resistor R2, and the other end of resistor R2 is grounded. The SW pins 5 and 6 of the FP7102 or FP7103 chip are connected to one end of inductor L1 and the cathode of diode D5. The other end of inductor L1 is connected to capacitors C6 and C7 and the positive output terminal LD+ of the constant current drive circuit. The positive terminal of diode D5 is... The negative terminals of capacitors C6 and C7 are grounded; the COMP pin 3 of the FP7102 or FP7103 chip is connected in series with the resistor R1 and the capacitor C3 and then grounded; the EN pin 2 and VCC pin 4 of the FP7102 or FP7103 chip are connected to the output terminal of the boost regulator circuit; the capacitors C4 and C5 are connected in parallel between the EN pin 2 and VCC pin 4 and ground; the GND pins 7 and 8 of the FP7102 or FP7103 chip are connected to the drain of the field-effect transistor, the source of the field-effect transistor is grounded, and the gate of the field-effect transistor is connected to the output terminal of the timing control circuit.

[0013] Furthermore, the timing control circuit includes an NE555DR chip, resistors RD1 and RD2, capacitors CD1 and CD2; the GND pin 1 of the NE555DR chip is grounded; the TRIG pin 2 of the NE555DR chip is connected to one end of the second switch S2 and one end of the resistor RD2, the other end of the second switch S2 is grounded, and the other end of the resistor RD2 is connected to the VCC pin 8 of the NE555DR chip; the THRES pin 6 and DISCH pin 7 of the NE555DR chip are connected and then connected to one end of the capacitor CD1 and one end of the resistor RD1, the other end of the capacitor CD1 is grounded, and the other end of the resistor RD1 is connected to the VCC pin 8 of the NE555DR chip; the CVOLT pin 5 of the NE555DR chip is connected to one end of the capacitor CD2, and the other end of the capacitor CD2 is grounded; the OUT pin 3 of the NE555DR chip is the output terminal of the timing control circuit.

[0014] Furthermore, the laser is a semiconductor laser, and a plano-convex lens is provided at the output end of the semiconductor laser. The plano-convex lens is used to collimate the laser beam to a spot area greater than 3 mm. 2 The beam of light.

[0015] Furthermore, the semiconductor laser can be any one or more semiconductor lasers operating in series.

[0016] Furthermore, the switching device includes a field-effect transistor (FET), the output terminal of the timing control circuit is connected to the gate of the FET, the drain of the FET is connected to the ground terminal of the constant current drive circuit, and the source of the FET is grounded.

[0017] Furthermore, the switching device also includes a relay, the output terminal of the timing control circuit is connected to the coil terminal pin 2 of the relay, the coil terminal pin 1 of the relay is grounded, the common terminal pin 3 of the relay is grounded, and the normally open terminal pin 4 of the relay is connected to the ground terminal of the constant current drive circuit.

[0018] Compared with the prior art, the cigarette lighter device with stable laser output provided by this utility model has the following beneficial effects:

[0019] (1) Based on high energy density output, the tobacco is ignited quickly. A high-power (power ≥ 3W) semiconductor laser and plano-convex lens focusing design are adopted to reduce the spot diameter to 2mm. Without reducing the laser ignition area, the laser power is increased by increasing the laser current, and the power density is increased to ≥ 0.9W / mm², so that the tobacco can be ignited within 2 seconds, which is far more efficient than the traditional solution.

[0020] (2) The boost regulator circuit, constant current drive circuit, and timing control circuit work together to ensure that the laser outputs stable power within a set time through the linkage logic of voltage boosting, constant current output, and timing control. Specifically, the boost regulator circuit stabilizes the lithium battery voltage to 5V, and the constant current drive circuit outputs a constant current of 4A, effectively suppressing voltage and current fluctuations and ensuring that the semiconductor laser power is stable at ≥3W.

[0021] (3) Design a two-stage switch and NE555 timing control circuit. After lightly touching the second switch, the laser output for a preset duration (1-5 seconds) will be automatically triggered and automatically turned off after the end of the operation. This avoids safety risks such as overheating or accidental touch caused by the laser continuing to work due to user forgetfulness.

[0022] (4) By connecting multiple lasers in series and working simultaneously, the laser power for cigarette lighting can be superimposed, thereby improving the efficiency of cigarette lighting. Attached Figure Description

[0023] The accompanying drawings, which form part of this disclosure, are used to provide a further understanding of this disclosure. The illustrative embodiments of this disclosure and their descriptions are used to explain this disclosure and do not constitute an undue limitation of this disclosure.

[0024] Figure 1 This is a schematic diagram of the overall structure of the cigarette lighter device provided by this utility model;

[0025] Figure 2 This is a diagram of the boost voltage regulator circuit provided by this utility model;

[0026] Figure 3 This is the circuit diagram of the boost chip provided by this utility model;

[0027] Figure 4 This is a functional block diagram of the boost chip provided by this utility model;

[0028] Figure 5 This is a constant current drive circuit diagram provided by this utility model;

[0029] Figure 6 This is a timing control circuit diagram for a switching device using a field-effect transistor, provided by this utility model.

[0030] Figure 7 This utility model provides a timing control circuit diagram for a switching device using a relay.

[0031] Figure 8 This is a schematic diagram of the working principle of the NE555DR chip in the timing control circuit provided by this utility model.

[0032] In the diagram, 1 is a collimating lens; 2 is a semiconductor laser; 3 is a switch button; 4 is a circuit board; 5 is a lithium battery; and 6 is a flip cover. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] Example 1

[0035] Please refer to the instruction manual appendix. Figure 1 This embodiment provides a cigarette lighting device that achieves stable laser output, including: a laser emitting module, comprising a laser and a collimating lens (1) connected to the optical path of the laser.

[0036] The power management module includes a lithium battery (5), a boost regulator circuit and a constant current drive circuit; the input terminal of the boost regulator circuit is connected to the lithium battery (5), the output terminal of the boost regulator circuit is connected to the input terminal of the constant current drive circuit, and the output terminal of the constant current drive circuit is connected to the laser.

[0037] The control module includes a first switch S1, a second switch S2, and a timing control circuit; the first switch is connected in series with the input terminal of the boost regulator circuit and is used to control the on / off state of the boost regulator circuit; the second switch is connected to the trigger terminal of the timing control circuit, and the output terminal of the timing control circuit is connected to the switching device.

[0038] The boost voltage regulator circuit, constant current drive circuit and timing control circuit are all soldered on the circuit board (4), and the first switch corresponds to the switch button (3) on the cigarette lighter device.

[0039] Specifically, such as Figure 2 As shown, the boost regulator circuit includes a boost chip, an inductor L2, a capacitor C1, and a capacitor C2; the EN enable pin of the boost chip is connected to one end of the first switch S1, and the other end of the first switch is connected to the lithium battery (5); the SW switching frequency control pin of the boost chip is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to the VIN input pin of the boost chip and the lithium battery (5); one end of the capacitor C1 is connected to the lithium battery (5), and the other end is grounded; the OUT pin of the boost chip is connected to one end of the capacitor C2, and the other end of the capacitor C2 is grounded; the AGND analog ground pin and the PGND power ground pin of the boost chip are both grounded.

[0040] In one specific embodiment, the boost chip may be of models such as SGM66055 or SCT12A0. Figure 3 and Figure 4As shown, the boost converter uses the SGM66055 chip, which is a 2.2MHz synchronous boost converter. Its operating principle is based on high-frequency switching control technology, achieving voltage conversion through the synergistic effect of internal switching transistors and external inductors and capacitors. It also integrates multiple protection mechanisms to ensure system stability. The specific process is as follows:

[0041] High-frequency switching control and boost principle

[0042] Switching and Inductor Energy Storage: The chip incorporates a MOSFET switch, which controls current switching via a high-frequency switch (2.2MHz). When the switch is on, the input voltage is applied to the inductor, causing the inductor current to rise linearly and store energy. When the switch is off, the inductor releases energy, which, combined with the input voltage, is output to the load via a synchronous rectifier, achieving a boost function. The high-frequency switch reduces the size of passive components such as inductors and capacitors, lowering system costs.

[0043] Synchronous rectification technology: The chip integrates a synchronous rectification switch, replacing traditional diode rectification, and provides a low-impedance path for inductor current during the switch's off-state. This technology significantly reduces rectification losses and improves conversion efficiency, typically reaching 93%. Synchronous rectification also reduces electromagnetic interference and optimizes output ripple performance.

[0044] Feedback regulation and voltage stabilization: The chip monitors the output voltage via the FB pin and dynamically adjusts the duty cycle of the switching transistor after comparing it with the internal reference voltage. When the output voltage fluctuates due to load changes, the feedback loop responds quickly to maintain the output voltage stable at 5.0V ± 2% accuracy. This mechanism ensures that the chip can achieve accurate voltage regulation within the input voltage range of 2.5V to 4.5V. When the load changes, the system can respond quickly to maintain a constant voltage.

[0045] Light-load and shutdown modes: The chip supports a light-load mode, which reduces switching losses and improves light-load efficiency by lowering the switching frequency. It also provides a shutdown control function, allowing the chip to be forced into a low-power state with a quiescent current of only 23μA via the EN pin.

[0046] Overcurrent Protection (OCP): Built-in overcurrent detection circuit automatically limits the current or shuts down the output when the output current exceeds the safe threshold and the chip's nominal 4A switching current capability, preventing component damage.

[0047] The working principle of the boost regulator circuit is as follows:

[0048] When the user presses the switch button (3) of the cigarette lighter device, the first switch S1 closes, the EN pin of the boost chip is at a high level, and the chip starts to work; the input pin 1 of the boost chip supports an input voltage range of 2.5V to 4.5V. When the input voltage is lower than the required 5V output voltage, the boost chip uses the internal switching transistor and the inductor L2 connected to the SW switching frequency control pin to boost the input voltage to provide a stable set output voltage. When the battery is connected to the input terminal, the input current is 4.2A when the battery voltage is 3.5V; 4A when the battery voltage is 3.7V; 3.8A when the battery voltage is 3.9V; and 3.6A when the battery voltage is 4.1V.

[0049] When the first switch S1 is disconnected and the EN pin is in a low-level state, the boost chip enters a low-power mode or a shutdown state.

[0050] Specifically, such as Figure 5 As shown, the constant current drive circuit includes an FP7102 or FP7103 chip, inductor L1, diode D5, resistors R1 and R2, capacitors C3, C4, C5, C6, and C7. The FB pin 1 of the FP7102 or FP7103 chip is connected to one end of resistor R2, and the other end of resistor R2 is grounded. The SW pins 5 and 6 of the FP7102 or FP7103 chip are connected to one end of inductor L1 and the cathode of diode D5. The other end of inductor L1 is connected to capacitors C6 and C7 and the positive output terminal LD+ of the constant current drive circuit. Diode D5... The positive terminal of pin 5 is grounded, and the negative terminals of capacitors C6 and C7 are grounded; the COMP pin 3 of the FP7102 or FP7103 chip is connected in series with resistor R1 and capacitor C3 and then grounded; the EN pin 2 and VCC pin 4 of the FP7102 or FP7103 chip are connected to the output terminal of the boost regulator circuit, and capacitors C4 and C5 are connected in parallel between the EN pin 2 and VCC pin 4 and ground; the GND pins 7 and 8 of the FP7102 or FP7103 chip are connected to the drain of the field-effect transistor, the source of the field-effect transistor is grounded, and the gate of the field-effect transistor is connected to the output terminal of the timing control circuit.

[0051] The boost converter chip provides the necessary power to the EN pin and power input pin 4 of the FP7102 or FP7103 chip via the output pin OUT, with an input voltage and current of 5V and 3A. The FB feedback pin 1 of the FP7102 or FP7103 chip receives a voltage reference signal from the signal acquisition module. The FP7102 or FP7103 chip connects to the negative terminal of the output load via FB pin 1 to detect the output voltage and compares it with an internal reference voltage to adjust the on-time of the switching transistor, thereby maintaining a stable output voltage. The adjustment voltage of the FB feedback pin is 0.25V, and the output current is set by Vfb and a current sampling resistor connected between the FB pin and ground, where I = Vfb / R2 = 4A. During the operation of the FP7102 or FP7103 chip, switch pins 5 and 6 are connected to the negative terminal of diode D5 and the first terminal of the first inductor L1, respectively. These pins are responsible for outputting PWM signals to control the on / off state of the internal switching transistor, achieving voltage step-down conversion. They also provide freewheeling current when the chip is off, ensuring stable circuit operation. The other terminal of the first inductor L1 is connected to the positive terminal of the output load. Ground pins 7 and 8 are connected to the negative terminal of the external power supply via a field-effect transistor, forming a reference zero potential point in the circuit. This provides a stable ground reference for the chip, ensuring normal circuit operation.

[0052] In one specific embodiment, the constant current drive circuit employs a high-current constant current drive module chip. This chip is a PWM-controlled buck converter, and its implementation principle is based on PWM control technology and a built-in P-MOSFET. It achieves efficient and stable laser driving through precise feedback and multiple protection mechanisms. The specific process is as follows:

[0053] PWM control mechanism: The chip uses a PWM pulse width modulation control circuit to linearly adjust the duty cycle from 0 to 100%, thereby achieving precise regulation of the output current.

[0054] Buck converter principle: The chip incorporates a high-current P-MOSFET, which converts the input voltage of 5V to a suitable output voltage of 2V through switching action. By selecting the current feedback resistor, a constant current output of 4A can be achieved. This ensures efficient energy conversion while simplifying the design of the external circuitry.

[0055] 0.25V Precision Feedback: The chip uses a 0.25V (±2%) reference voltage for feedback, with the output current set by an external resistor. This low reference voltage design effectively reduces power consumption while ensuring the stability of the drive current.

[0056] Constant current regulation function: The chip can flexibly set the output current through the feedback pin to meet different power drive requirements. The built-in constant current control scheme can control the current accuracy within ±2%.

[0057] Anti-interference and stability: The chip adopts a fixed operating frequency of 320KHz to reduce electromagnetic interference, and has a built-in cycle-by-cycle current limiting function to ensure stable output even under sudden load changes.

[0058] Specifically, such as Figure 6 and Figure 7 As shown, the timing control circuit includes an NE555DR chip, resistors RD1 and RD2, and capacitors CD1 and CD2. The GND pin of the NE555DR chip is grounded. The TRIG pin 2 of the NE555DR chip is connected to one end of the second switch S2 and one end of the resistor RD2. The other end of the second switch S2 is grounded, and the other end of the resistor RD2 is connected to the VCC pin 8 of the NE555DR chip. The THRES pin 6 and DISCH pin 7 of the NE555DR chip are connected to one end of the capacitor CD1 and one end of the resistor RD1. The other end of the capacitor CD1 is grounded, and the other end of the resistor RD1 is connected to the VCC pin 8 of the NE555DR chip. The CVOLT pin 5 of the NE555DR chip is connected to one end of the capacitor CD2, and the other end of the capacitor CD2 is grounded. The OUT pin 3 of the NE555DR chip is the output terminal of the timing control circuit.

[0059] Switching devices can be either field-effect transistors (FETs) or relays. When a field-effect transistor is used as the switching device, such as... Figure 6 As shown, the output of the timing control circuit is connected to the gate of the field-effect transistor (FET), the drain of the FET is connected to the ground of the constant current drive circuit, and the source of the FET is grounded. When a relay is used as the switching device, as shown... Figure 7 As shown, the output terminal of the timing control circuit is connected to pin 2 of the relay coil terminal, pin 1 of the relay coil terminal is grounded, pin 3 of the relay common terminal is grounded, and pin 4 of the relay normally open terminal is connected to the ground terminal of the constant current drive circuit.

[0060] In one specific embodiment, the working principle of the NE555DR chip in the timing control circuit is as follows: Figure 8 As shown, this chip achieves timing, oscillation, and pulse generation functions by controlling the output state through the synergistic effect of internal comparators, RS flip-flops, discharge transistors, and other components, and by using external internal resistance and capacitors to control the output state.

[0061] The NE555DR chip is configured in monostable trigger mode and includes: a voltage divider consisting of three 5KΩ resistors connected in series, a first comparator Comp1, a second comparator Comp2, an RS flip-flop, a discharge transistor, and a buffer amplifier. The voltage divider divides the power supply voltage Vcc into 1 / 3Vcc and 2 / 3Vcc reference voltages. The non-inverting input of the first comparator Comp1 is connected to the THRES pin 6, and the inverting input is connected to the 2 / 3Vcc reference voltage. The inverting input of the second comparator Comp2 is connected to the TRIG pin 2, and the non-inverting input is connected to the 1 / 3Vcc reference voltage. The set input S of the RS flip-flop is connected to the output of the second comparator, and the reset input R is connected to the output of the first comparator. One end of the discharge transistor is connected to pin 1 of the RS flip-flop, and the other end is connected to the DISCH pin 7. One end of the buffer amplifier is connected to pin 1 of the RS flip-flop, and the other end is connected to the OUT pin 3.

[0062] When a low-level signal less than 1 / 3Vcc is input to TRIG pin 2, the RS flip-flop is set, OUT pin 3 outputs a high level, the discharge transistor is turned off, and capacitor CD1 is charged through resistor RD1.

[0063] When the voltage of capacitor CD1 rises to 2 / 3Vcc, the RS flip-flop is reset, the OUT pin 1 outputs a low level, and the discharge transistor is turned on, so capacitor CD1 discharges through the DISCH pin 7.

[0064] The specific process is as follows:

[0065] Voltage divider: Composed of three 5KΩ resistors connected in series, it divides the power supply voltage into two reference voltages, 1 / 3Vcc and 2 / 3Vcc, which are connected to the inverting inputs of two comparators respectively.

[0066] Comparator: Contains two voltage comparators, Comp1 and Comp2. The non-inverting input of Comp1 is connected to the threshold input THR, and the inverting input of Comp2 is connected to the trigger input TRIG.

[0067] RS flip-flop: The state of the flip-flop is controlled by the output signal of the comparator, which determines the level of the output terminal.

[0068] Discharge transistor: Connected to the discharge DIS terminal, it controls the charging and discharging process of the external capacitor.

[0069] Buffer amplifier: Enhances the driving capability of the output terminal and provides high-level or low-level signals.

[0070] Connect to an astable mode with any duty cycle.

[0071] Charging process: After Vcc is turned on, the capacitor is charged through external resistors RD1 and RD2. When the capacitor voltage rises to 2 / 3Vcc, the RS flip-flop is reset, the output becomes low, and the discharge transistor turns on the capacitor to start discharging.

[0072] Discharge process: When the capacitor voltage discharges to 1 / 3Vcc, the RS flip-flop is set, the output becomes high, the discharge transistor is cut off, and the capacitor starts to charge again. This cycle repeats, generating periodic pulse signals.

[0073] In a timer monostable circuit, the output remains low. After being triggered at the input, the output becomes high, and after a set delay, it returns to low and remains there.

[0074] Capacitor CD1 is connected to the discharge terminal. Under stable conditions, both the output terminal and the discharge terminal are at low level. Therefore, capacitor CD1 is shorted to ground and will not pass through RD1.

[0075] The trigger terminal is connected to a high level via pull-up resistor RD2, and a low-level pulse is generated through a grounded switch. Pressing the switch grounds the trigger terminal, generating a low level. Since the trigger terminal is below 1 / 3 Vcc at this time, the output terminal becomes high, and the discharge terminal becomes high impedance. This causes capacitor CD1 to no longer be shorted to ground and begin charging through RD1. During charging, the voltage across CD1 increases until it reaches 2 / 3 Vcc. Once the threshold voltage reaches 2 / 3 Vcc, the output terminal becomes low, and the discharge terminal also becomes low. Therefore, CD1 stops charging and discharges through the discharge terminal.

[0076] The timer output achieves the timing output function of the constant current drive circuit by controlling the conduction of the ground terminal of the constant current drive circuit through the connection of the field-effect transistor.

[0077] The cigarette lighter also includes a flip cover (6), which is hinged to the light outlet of the semiconductor laser (2). The inside of the flip cover (6) is coated with light-absorbing material. When the flip cover is closed, it completely covers the laser light outlet and is used to block the laser beam when not in operation.

[0078] Explanation of the circuit connection relationships between the boost regulator circuit, the constant current drive circuit, and the timing control circuit:

[0079] (1) Power path: such as Figure 2 The lithium battery output is connected to the input terminal (VIN pin) of the boost regulator circuit, such as... Figure 2 and Figure 5 The output terminal (OUT pin) of the boost regulator circuit is also connected to the power input pins (VCC and EN pins) of the constant current drive circuit, providing a stable 5V operating voltage for the constant current drive circuit.

[0080] (2) Enable control: The first switch S1 is connected in series between the enable terminal (EN pin) of the boost regulator circuit and the positive terminal of the lithium battery to control the start and stop of the boost regulator circuit globally.

[0081] (3) Timing trigger: One end of the second switch S2 is grounded, and the other end is connected to the trigger pin of the timing control circuit (TRIG pin 2 of NE555) and resistor RD2 to trigger the timing signal.

[0082] (4) Constant current drive control: The output terminal of the timing control circuit (OUT pin 3 of NE555) is connected to the switching device (field-effect transistor gate or relay coil), and the switching device is connected in series in the grounding loop of the constant current drive circuit (between the GND pin of FP7102 / FP7103 and ground):

[0083] like Figure 6 Field-effect transistor (FET) design: Drain connected to the GND pin of the constant current drive circuit, source grounded;

[0084] like Figure 7 Relay solution: The normally open contact is connected to the GND pin of the constant current drive circuit, and the common terminal is grounded.

[0085] (5) Working logic:

[0086] Close the first switch → The boost regulator circuit outputs 5V to the constant current drive circuit;

[0087] Trigger the second switch → The timing control circuit outputs a high level → The switching device turns on → The grounding loop of the constant current drive circuit closes → The laser starts;

[0088] After the timing ends, the timing control circuit outputs a low level, the switching device is disconnected, and the constant current drive circuit stops working.

[0089] The overall working principle of this utility model is as follows:

[0090] S1: Close the first switch, and the boost regulator circuit boosts the voltage of the lithium battery (5) to 5V and outputs it to the constant current drive circuit;

[0091] S2: Touching the second switch triggers the timing control circuit to output a high-level signal to the switching device, turning on the switching device and allowing the constant current drive circuit to drive the laser to work with a constant current.

[0092] S3: The timing control circuit outputs a low-level signal according to the set time, the switching device is turned off, the constant current drive circuit stops working, and the laser is turned off.

[0093] Specifically, the boost regulator circuit uses high-frequency switching control technology to achieve voltage conversion by utilizing the synergistic effect of the built-in MOSFET switch and external inductor and capacitor, thereby boosting the 3.7V voltage of the lithium battery (5) to 5V.

[0094] Specifically, the constant current drive circuit converts the input 5V voltage to 2V voltage through the PWM pulse width modulation control circuit, and achieves a constant current output of 4A by setting the feedback resistor.

[0095] Specifically, the timing time of the timing control circuit is set by the parameters of the external resistor RD1 and capacitor CD1, and the timing time is 1.1×RD1×CD1.

[0096] In one specific embodiment, when a field-effect transistor (FET) is used as the switching device, the circuit connects to the enable pin of the boost regulator circuit via a first switch. Connecting the switch applies a high-level signal to the enable pin, controlling the boost chip to turn on. The boost chip then begins operating, performing voltage conversion and output. The output of the boost circuit is connected to a second switch and the input of the constant current drive circuit. The output of the timing control circuit is connected to the gate of the FET, its drain is connected to the ground terminal of the constant current drive circuit, and its source is grounded. The second switch is connected to the input terminal of the timing control circuit.

[0097] When the first switch is connected, the boost circuit output is activated. At this time, both the second switch and the constant current drive circuit have a 5V input. Touching the second switch activates the timing control circuit, which outputs a high-level signal to the MOSFET. The MOSFET then conducts, enabling the constant current drive circuit to start operating. After the set timing period, the output of the timing control circuit goes low, disconnecting the drain and source of the MOSFET and ending the constant current drive circuit's operation. When the first switch is disconnected, the enable pin of the boost regulator circuit is pulled low, and the circuit enters shutdown mode, ceasing operation.

[0098] In one specific embodiment, when the switching device is a relay, the timing control circuit outputs a low-level signal according to the set time, which controls the normally open contact of the relay to open and the normally closed contact to close, so that the constant current drive circuit stops working and the laser is turned off.

[0099] The laser can be switched to ignite by turning on the first switch and then pressing the second switch once to start the laser.

[0100] Laser: 850nm vertical-cavity surface-emitting semiconductor laser, using a plano-convex lens for beam collimation. The plano-convex lens is used to collimate the laser beam to a spot size greater than 3mm. 2 The light beam consists of one or more semiconductor lasers that operate in series. By connecting multiple lasers in series and having them operate simultaneously, the laser power for cigarette lighting can be superimposed, thus improving the efficiency of cigarette lighting.

[0101] Boost regulator circuit: A boost chip (in one specific embodiment, the boost chip can be SGM66055, SCT12A0, etc.) is used to boost the lithium battery (5) 3.7V to 5V, with an output current ≥3A and an efficiency >90%.

[0102] Constant current drive circuit: Utilizing the FP7103XR-LF chip, by adjusting the feedback resistor Rset of the FP7103XR-LF, the output current Iout = 4A, satisfying the power requirement P = 4A × 2.0V = 8W. Resistor matching: According to the FP7103XR-LF datasheet, Rset (Ω) = 0.25 / Iout, setting = 0.0625Ω is selected to achieve a 2V 4A current output to power the laser, with a laser output power greater than 3W.

[0103] The power density of the laser module output is calculated using the following formula:

[0104]

[0105] Specifically, the laser power for ignition is calculated as follows: at room temperature, the mass of tobacco ignited in 2 seconds is approximately 0.01g.

[0106] m = 0.01g, spot diameter 2mm (area: A = π × (1mm)) 2 =3.14159mm 2 ).

[0107] Energy requirements: Ignition point of tobacco shreds 250°C (specific heat capacity ≈ 1.2 J / g·°C), ΔT = 230°C):

[0108] Q=m×c×ΔT=0.01×1.2×230≈2.76J

[0109] Theoretical power (without heat loss): Q / t = 2.76 J / 2s ≈ 1.38 W

[0110] Actual power (heat loss compensation): The laser is an 850nm semiconductor laser. Experiments show that when the laser spot size is 2mm and the ignition time is less than 2s, the laser power density is ≥0.9W / mm² (total power ≥3W), the spot energy is concentrated and penetrates the surface of the tobacco. At a power of 3W, the laser drive circuit needs to output a constant current of 2V 4A.

[0111] In the description of this specification, the terms "connection", "installation", "fixing", "setting", etc. are interpreted in a broad sense. For example, "connection" can be a fixed connection or an indirect connection through an intermediate component without affecting the relationship between components and the technical effect. It can also be an integral connection or a partial connection. In such cases, those skilled in the art can understand the specific meaning of the above terms in this utility model or utility model according to the specific circumstances.

[0112] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A cigarette-lighting device that achieves stable laser output, characterized in that, include: A laser emitting module includes a laser and a collimating lens connected to the optical path of the laser; The power management module includes a lithium battery, a boost regulator circuit, and a constant current drive circuit; the input terminal of the boost regulator circuit is connected to the lithium battery, the output terminal of the boost regulator circuit is connected to the input terminal of the constant current drive circuit, and the output terminal of the constant current drive circuit is connected to the laser. The control module includes a first switch S1, a second switch S2, and a timing control circuit; the first switch is connected in series with the enable terminal of the boost regulator circuit to control the on / off state of the boost regulator circuit; the second switch is connected to the trigger terminal of the timing control circuit, and the output terminal of the timing control circuit is connected to the switching device.

2. The cigarette lighter device as described in claim 1, characterized in that, The boost regulator circuit includes a boost chip, an inductor L2, a capacitor C1, and a capacitor C2. The EN enable terminal of the boost chip is connected to one end of the first switch S1, and the other end of the first switch is connected to the lithium battery. The SW frequency control terminal of the boost chip is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to the VIN input terminal of the boost chip and the lithium battery. One end of the capacitor C1 is connected to the lithium battery, and the other end is grounded. The OUT output terminal of the boost chip is connected to one end of the capacitor C2, and the other end of the capacitor C2 is grounded. The AGND analog ground terminal and the PGND power ground terminal of the boost chip are both grounded.

3. The cigarette lighter device as described in claim 1, characterized in that, The constant current drive circuit includes an FP7102 or FP7103 chip, an inductor L1, a diode D5, resistors R1 and R2, and capacitors C3, C4, C5, C6, and C7. The FB pin 1 of the FP7102 or FP7103 chip is connected to one end of resistor R2, and the other end of resistor R2 is grounded. The SW pins 5 and 6 of the FP7102 or FP7103 chip are connected to one end of inductor L1 and the cathode of diode D5. The other end of inductor L1 is connected to capacitors C6 and C7 and to the positive output terminal LD+ of the constant current drive circuit. The anode of diode D5 is... The negative terminals of capacitors C6 and C7 are grounded; the COMP pin 3 of the FP7102 or FP7103 chip is connected in series with the resistor R1 and the capacitor C3 and then grounded; the EN pin 2 and VCC pin 4 of the FP7102 or FP7103 chip are connected to the output terminal of the boost regulator circuit; the capacitors C4 and C5 are connected in parallel between the EN pin 2 and VCC pin 4 and ground; the GND pins 7 and 8 of the FP7102 or FP7103 chip are connected to the drain of the field-effect transistor, the source of the field-effect transistor is grounded, and the gate of the field-effect transistor is connected to the output terminal of the timing control circuit.

4. The cigarette lighter device as described in claim 1, characterized in that, The timing control circuit includes an NE555DR chip, resistors RD1 and RD2, and capacitors CD1 and CD2. The GND pin of the NE555DR chip is grounded. The TRIG pin 2 of the NE555DR chip is connected to one end of the second switch S2 and one end of the resistor RD2, with the other end of the second switch S2 grounded. The other end of the resistor RD2 is connected to the VCC pin 8 of the NE555DR chip. The THRES pin 6 and DISCH pin 7 of the NE555DR chip are connected to one end of the capacitor CD1 and one end of the resistor RD1, with the other end of the capacitor CD1 grounded. The other end of the resistor RD1 is connected to the VCC pin 8 of the NE555DR chip. The CVOLT pin 5 of the NE555DR chip is connected to one end of the capacitor CD2, with the other end of the capacitor CD2 grounded. The OUT pin 3 of the NE555DR chip is the output terminal of the timing control circuit.

5. The cigarette lighter device as described in claim 1, characterized in that, The laser is a semiconductor laser, and a plano-convex lens is provided at the output end of the semiconductor laser. The plano-convex lens is used to collimate the laser beam to a spot size greater than 3mm. 2 The beam of light.

6. The cigarette lighter device as described in claim 5, characterized in that, The semiconductor laser can be any one or more semiconductor lasers operating in series.

7. The cigarette lighter device as described in claim 1, characterized in that, The switching device includes a field-effect transistor (FET). The output terminal of the timing control circuit is connected to the gate of the FET, the drain of the FET is connected to the ground terminal of the constant current drive circuit, and the source of the FET is grounded.

8. The cigarette lighter device as claimed in claim 1, characterized in that, The switching device also includes a relay. The output terminal of the timing control circuit is connected to the coil terminal pin 2 of the relay. The coil terminal pin 1 of the relay is grounded, the common terminal pin 3 of the relay is grounded, and the normally open terminal pin 4 of the relay is connected to the ground terminal of the constant current drive circuit.

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