Semiconductor laser ignition device

Abstract

The utility model discloses a semiconductor laser ignition device, and belongs to the technical field of laser ignition. The semiconductor laser ignition device comprises a semiconductor laser transmitter, a laser driving circuit and a push switch, the semiconductor laser transmitter comprises a shell, a semiconductor laser, a laser shaping lens and window glass are sequentially arranged in the shell from bottom to top, and an ignition opening is formed in the shell and located above the window glass; the output end of the laser driving circuit is electrically connected with the semiconductor laser, the input end of the laser driving circuit is electrically connected with a relay, and the relay is electrically connected with an external power supply; the push switch is arranged on the shell and electrically connected with a switch closing time-delay circuit, and the output end of the switch closing time-delay circuit is electrically connected with the relay. The service life of the ignition equipment can be prolonged, and the use convenience and stability of the ignition equipment are improved; the problems that an existing laser ignition device is too large in size and insufficient in operation convenience are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of laser ignition, in particular to a semiconductor laser ignition device. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] Traditional ignition methods such as spark plugs and heating wires have certain deficiencies in terms of power conversion efficiency, reaction speed, service life, etc. For example, the heating wire generates severe heat and its service life is generally about one month.

[0004] With the development of laser technology, laser products have been widely used in various fields. Among them, the development of laser ignition technology has been rapid and has been widely used in the fields of aviation, aerospace and automobile industry.

[0005] Most existing laser ignition devices achieve laser drive by powering the laser transmitter with their own batteries. However, the laser ignition moment requires large current energy and has high requirements for battery capacity, which results in a larger battery volume. This in turn increases the overall volume of the laser ignition device, making it difficult to carry and affecting the convenience of using the laser ignition device.

[0006] In addition, when the laser ignition device is working, the push switch needs to be pressed continuously, which affects the convenience of using the laser ignition device; and the large current has a greater impact on the life of the push switch, affecting the stability of the use of the laser ignition device. Utility Model Content

[0007] In view of the deficiencies in the prior art, the purpose of the embodiments of the present utility model is to provide a semiconductor laser ignition device to improve the convenience and reliability of the laser ignition equipment.

[0008] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0009] A semiconductor laser ignition device, comprising:

[0010] A semiconductor laser emitter, the semiconductor laser emitter comprising a shell, wherein a semiconductor laser, a laser shaping lens and a window glass are arranged in sequence from bottom to top inside the shell, and an ignition port is provided on the shell, and the ignition port is located above the window glass;

[0011] A laser driving circuit, wherein an output end of the laser driving circuit is electrically connected to the semiconductor laser, an input end of the laser driving circuit is electrically connected to a relay, and the relay is electrically connected to an external power supply;

[0012] A push switch is arranged on the housing, the push switch is electrically connected to a switch closing delay circuit, and an output end of the switch closing delay circuit is electrically connected to the relay.

[0013] In some embodiments, the switch closing delay circuit includes a 555 timer, a first resistor, a second resistor, a first capacitor, and a second capacitor;

[0014] The first end of the push switch is grounded, the second end of the push switch is electrically connected to the first end of the second resistor and the TRG end of the 555 timer respectively, and the second end of the second resistor is electrically connected to the high level end;

[0015] The first end of the first capacitor is grounded, the second end of the first capacitor is electrically connected to the first end of the first resistor and the THR end of the 555 timer respectively, and the second end of the first resistor is electrically connected to the RST end of the 555 timer; the first end of the second capacitor is electrically connected to the CTL end of the 555 timer, and the second end of the second capacitor is grounded; the OUT end of the 555 timer is electrically connected to the coil of the relay.

[0016] In some embodiments, the laser driving circuit includes a constant current switching regulator, the VCC terminal of the constant current switching regulator is electrically connected to the normally open end of the relay, the constant current switching regulator is electrically connected to a current output circuit, and the output end of the current output circuit is electrically connected to the electrode of the semiconductor laser emitter.

[0017] In some embodiments, the operating current of the push switch is no more than 50 mA, and the operating current of the relay is at least 2 A.

[0018] In some embodiments, a metal bracket is provided between the window glass and the ignition port.

[0019] In some embodiments, the horizontal diameter of the metal stent is less than 5 mm.

[0020] In some embodiments, a TYPE-C interface is provided on the housing, and the common end of the relay is electrically connected to an external power supply through the TYPE-C interface.

[0021] In some embodiments, the window glass is a sapphire sheet, and a laser anti-reflection film is disposed on the surface of the sapphire sheet.

[0022] In some embodiments, a heat sink is disposed at the bottom of the semiconductor laser.

[0023] In some embodiments, the laser shaping lens is a cylindrical positive lens or an aspherical convex lens.

[0024] The technical solution provided by the utility model has at least the following technical effects or advantages:

[0025] 1. The technical solution provided by the utility model adopts a high-efficiency semiconductor laser to generate laser through current excitation, which has the advantages of high energy conversion efficiency, fast response speed, long service life, etc., and fixes the semiconductor laser to the heat sink to provide stable heat dissipation for the semiconductor laser to ensure stable output of the laser.

[0026] 2. The technical solution provided by the utility model uses a constant current switch regulator to design a laser drive circuit, providing a constant current drive for the semiconductor laser transmitter, ensuring the stability of the load, ensuring that the equipment operates within a safe range, and improving the safety and stability of the load. It can provide an efficient and stable power supply for the load, thereby saving energy and reducing the cost of use.

[0027] 3. The technical solution provided by the utility model designs a switch closing delay circuit. After the push switch is pressed, the switch closing state is delayed by the switch closing delay circuit. Laser ignition can be achieved without pressing the push switch for a long time, thereby improving the convenience of using the semiconductor laser ignition device.

[0028] 4. The technical solution provided by the utility model does not require a built-in power supply and can be charged with the help of a power bank or a mobile phone carried by the user, thereby reducing the size and weight of the semiconductor laser ignition device and making it easier for users to carry it daily. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0030] Figure 1 It is a structural schematic diagram of a semiconductor laser ignition device provided by an embodiment of the utility model;

[0031] Figure 2 It is a schematic diagram of the internal structure of the semiconductor laser ignition device provided by the embodiment of the utility model;

[0032] Figure 3 It is a circuit diagram of a switch closing delay circuit provided by an embodiment of the utility model;

[0033] Figure 4 It is a circuit diagram of a laser driving circuit provided by an embodiment of the utility model;

[0034] In the figure: 1. Shell; 2. Semiconductor laser; 3. Laser shaping lens; 4. Window glass; 5. Ignition port; 6. PCB circuit board; 7. TYPE-C interface; 8. Push switch; 9. Heat sink.

[0035] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0037] As introduced in the background technology, the safety and stability of the laser ignition device in the prior art need to be improved. In order to solve the above technical problems, the utility model proposes a semiconductor laser ignition device, designs a delay switch circuit and improves the laser driving circuit to improve the reliability of the semiconductor laser ignition device.

[0038] Combination Figure 1-Figure 4 The semiconductor laser ignition device includes a semiconductor laser emitter, a laser driving circuit and a push switch 8. The semiconductor laser emitter includes a housing 1. A semiconductor laser 2, a laser shaping lens 3 and a window glass 4 are installed inside the housing 1. The laser shaping lens 3 is located directly above the emission hole of the semiconductor laser 2. The window glass 4 is located above the laser shaping lens 3 and fixed on the housing 1. A through hole is provided on the housing 1 corresponding to the window glass 4. A metal bracket is provided on the through hole. An ignition port 5 is provided on the metal bracket. The ignition port 5 is an image point formed by the light-emitting point of the semiconductor laser 2 after passing through the laser shaping lens 3. The opening diameter thereof is less than 5 mm. After the laser emitted by the semiconductor laser 2 is shaped by the laser shaping lens 3, it is emitted to the ignition port 5 through the window glass 4 on the housing 1 for ignition. The window glass 4 is used for physical isolation between the optical system and the ignition port 5 to prevent smoke pollution.

[0039] A PCB circuit board 6 is placed in the housing 1, and a switch closing delay circuit, a laser driving circuit and a relay are welded on the PCB circuit board 6. A TYPE-C interface 7 is installed on the housing 1. The input end of the laser driving circuit is electrically connected to the normally open end of the relay, and the common end of the relay is electrically connected to the TYPE-C interface 7, and is connected to an external power supply through the TYPE-C interface 7; the output end of the laser driving circuit is electrically connected to the semiconductor laser 2, and is used to drive the semiconductor laser 2 to work. The input end of the switch closing delay circuit is electrically connected to the push switch 8, and the output end of the switch closing delay circuit is electrically connected to the coil of the relay, and then the opening and closing of the laser driving circuit is controlled by controlling the connection between the common end and the normally open end or the normally closed end in the relay.

[0040] Further, such as Figure 1 As shown, the switch closing delay circuit includes a 555 timer, a first resistor, a second resistor, a first capacitor and a second capacitor. The first end of the push switch 8 is grounded, the second end of the push switch 8 is electrically connected to the first end of the second resistor R2 and the TRG end of the 555 timer, respectively, the first end of the second resistor R2 is electrically connected to the TRG end of the 555 timer, and the second end of the second resistor R2 is electrically connected to the high level end Vcc; the first end of the first capacitor C1 is grounded, the second end of the first capacitor C1 is electrically connected to the first end of the first resistor R1 and the THR end of the 555 timer, the first end of the first resistor R1 is electrically connected to the DIS end of the 555 timer, and the second end of the first resistor R1 is electrically connected to the RST end of the 555 timer; the first end of the second capacitor C2 is electrically connected to the CTL end of the 555 timer, and the second end of the second capacitor C2 is grounded; the OUT end of the 555 timer is electrically connected to the coil of the relay.

[0041] In this embodiment, the switch closing delay circuit is a timing monostable circuit. After the input terminal is triggered, the output terminal becomes a high level, and after a delay period, it changes back to a low level and remains low.

[0042] As an implementation mode, in the initial state, the TRG terminal of the 555 timer is connected to a high level through a pull-up resistor, and a low level pulse is generated by pressing the switch 8. After pressing the push switch 8, the TRG terminal of the 555 timer is grounded, generating a low level. At this time, since the voltage at the TRG terminal is less than 1 / 3 Vcc, the output of the OUT terminal of the 555 timer becomes a high level, the coil of the relay is energized, the common terminal of the relay contacts the normally open terminal, the laser driving circuit is connected to the external power supply, and the laser driving circuit works to provide a working current for the semiconductor laser 2, so that it generates laser.

[0043] At this time, the DIS terminal of the 555 timer becomes a high impedance state, so that the first capacitor C1 is no longer short-circuited and is charged through the first resistor R1. During charging, the voltage across the first capacitor C1 increases until the voltage reaches 2 / 3Vcc. After reaching 2 / 3Vcc, the output of the OUT terminal becomes a low level, the common terminal of the relay is connected to the normally closed terminal, the path between the laser drive circuit and the external power supply is disconnected, and the laser drive circuit stops working.

[0044] At the same time, the DIS terminal also becomes a low level, so the first capacitor C1 is no longer charged, but discharged through the DIS terminal. The high level continuous output time of the OUT terminal is the switch closing delay time of the first capacitor C1 charging from 0 to 2 / 3Vcc. During this time period, the semiconductor laser 2 emits lasers without long pressing the push switch 8. The time can be changed by the values ​​of the first capacitor C1 and the first resistor R1.

[0045] like Figure 2 As shown, the laser driving circuit includes a constant current switching regulator, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a diode D1 and an inductor L.

[0046] A first end of the third capacitor C3 is grounded, a second end of the third capacitor C3 is electrically connected to a first end of the third resistor R3, a second end of the third resistor R3 is electrically connected to a third end COMP of the constant current switch regulator, and the third end COMP of the constant current switch regulator is a loop compensation pin. A first end of the fourth capacitor C4 is grounded, and a second end of the fourth capacitor C4 is electrically connected to a fourth end VCC of the constant current switch regulator; a first end of the fifth capacitor C5 is grounded, and a second end of the fifth capacitor C5 is electrically connected to a fourth end VCC of the constant current switch regulator; the fourth end VCC of the constant current switch regulator is electrically connected to a normally open end of the relay; a first end FB of the constant current switch regulator is electrically connected to a first end of a fourth resistor R4, and a second end of the fourth resistor R4 is electrically connected to a second electrode LD- of the semiconductor laser emitter; a first end of the diode D1 is electrically connected to a sixth end SW of the constant current switch regulator, and a second end of the diode D1 is grounded; a first end of the inductor L is electrically connected to a fifth end SW2 of the constant current switch regulator, a second end of the inductor L is electrically connected to a sixth capacitor C6, a seventh capacitor C7 and an eighth capacitor C8 respectively, an eighth capacitor C8 is electrically connected to an eighth resistor R8, a first end of the eighth capacitor C8 is electrically connected to a first electrode LD+ of the semiconductor laser emitter, and a second end of the eighth capacitor C8 is electrically connected to a second electrode LD- of the semiconductor laser emitter.

[0047] Among them, the constant current switch regulator is a FP7102 chip step-down driver IC, LD is a semiconductor laser 2, the fourth capacitor is an input capacitor, the sixth capacitor is an output capacitor, the fifth capacitor and the seventh capacitor are filter capacitors, the third capacitor and the third resistor are system compensation loops, the fourth resistor R4 is a current sampling resistor, and the LD current is set. The diode D1 is used to conduct to provide an inductor discharge loop, and the inductor is used for energy storage and filtering. After pressing the push switch 8, the boost output is obtained through an external power supply to provide voltage for the chip, between the load output and the FB terminal, and the load current is set by a sampling resistor connected between FB and ground to set a variety of current outputs.

[0048] The laser driving circuit used in this embodiment is a laser driving circuit in the prior art, and its specific connection relationship and operation mode are not described in detail. The above-mentioned semiconductor emitter, laser shaping lens 3, etc. are fixed in the housing 1 through corresponding fixing brackets. This is the prior art in the field, and this embodiment does not make any improvements on this, so it is not described in detail here. The window glass 4 is a sapphire sheet, and the surface of the sapphire sheet is coated with a laser anti-reflection film, and the laser shaping lens 3 is a cylindrical positive lens.

[0049] In addition, the rated operating current of the push switch 8 is 500 mA. Under this operating current, many types of push switches 8 can be used, and the service life of the push switch 8 is extended. In this embodiment, the model of the push switch 8 is an Omron D2F series switch. The rated operating current of the relay is at least 2A, and the model of the relay is an OMRON G6K series, which is small in size, reducing the size of the semiconductor laser ignition device.

[0050] As an implementation mode, in order to dissipate heat from the semiconductor laser 2 , a heat sink 9 is installed at the bottom of the semiconductor laser 2 .

[0051] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.

Claims

1. A semiconductor laser ignition device, characterized in that: include: A semiconductor laser emitter, the semiconductor laser emitter comprising a shell, wherein a semiconductor laser, a laser shaping lens and a window glass are arranged in sequence from bottom to top inside the shell, and an ignition port is provided on the shell, and the ignition port is located above the window glass; A laser driving circuit, wherein an output end of the laser driving circuit is electrically connected to the semiconductor laser, an input end of the laser driving circuit is electrically connected to a relay, and the relay is electrically connected to an external power supply; A push switch is arranged on the housing, the push switch is electrically connected to a switch closing delay circuit, and an output end of the switch closing delay circuit is electrically connected to the relay.

2. The semiconductor laser ignition device according to claim 1, characterized in that: The switch closing delay circuit includes a 555 timer, a first resistor, a second resistor, a first capacitor and a second capacitor; The first end of the push switch is grounded, the second end of the push switch is electrically connected to the first end of the second resistor and the TRG end of the 555 timer respectively, and the second end of the second resistor is electrically connected to the high level end; The first end of the first capacitor is grounded, the second end of the first capacitor is electrically connected to the first end of the first resistor and the THR end of the 555 timer respectively, and the second end of the first resistor is electrically connected to the RST end of the 555 timer; the first end of the second capacitor is electrically connected to the CTL end of the 555 timer, and the second end of the second capacitor is grounded; the OUT end of the 555 timer is electrically connected to the coil of the relay.

3. The semiconductor laser ignition device according to claim 1, characterized in that: The laser driving circuit includes a constant current switching regulator, the VCC end of the constant current switching regulator is electrically connected to the normally open end of the relay, the constant current switching regulator is electrically connected to a current output circuit, and the output end of the current output circuit is electrically connected to the electrode of the semiconductor laser emitter.

4. The semiconductor laser ignition device according to claim 1, characterized in that: The operating current of the push switch is no more than 50 mA, and the operating current of the relay is at least 2 A.

5. The semiconductor laser ignition device according to claim 1, characterized in that: A metal bracket is arranged between the window glass and the ignition port.

6. The semiconductor laser ignition device according to claim 5, characterized in that: The horizontal diameter of the metal bracket is less than 5 mm.

7. The semiconductor laser ignition device according to claim 1, characterized in that: The housing is provided with a TYPE-C interface, and the common end of the relay is electrically connected to an external power supply through the TYPE-C interface.

8. The semiconductor laser ignition device according to claim 1, characterized in that: The window glass is a sapphire sheet, and a laser anti-reflection film is arranged on the surface of the sapphire sheet.

9. The semiconductor laser ignition device according to claim 1, characterized in that: A heat sink is arranged at the bottom of the semiconductor laser.

10. The semiconductor laser ignition device according to claim 1, characterized in that: The laser shaping lens is a cylindrical positive lens or an aspherical convex lens.

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