CN103742942A - Automobile-mounted cigarette lighter with protection device - Google Patents

Abstract

The invention discloses a car cigarette lighter with a protective device. When the bimetal sheet of the existing cigarette lighter cannot be ejected, the car instrument will be burnt out if the temperature is too high. The return spring of the present invention is sleeved on the guide and positioning tube, the guide and positioning tube is sleeved on the connecting rod, and the tail of the connecting rod is fixed with the pull button; one end of the resistance wire is embedded in the slit of the head of the connecting rod, and the other end is fixed on the resistor On the inner wall of the seat; the bimetal is embedded in the groove on the top of the porcelain seat; the bottom of the porcelain seat is embedded in the bottom inner wall of the shell; the bottom of the conductive spring is snapped into the porcelain seat; the resistance seat is set on the top of the bimetal; The box body is arranged at the bottom of the shell, the top of the plastic seat is embedded in the bottom cover of the heat insulation box; the top of the lug is embedded in the bottom of the plastic seat; the wiring seat is arranged at the bottom of the lug; the fastening nut presses the wiring seat. When the bimetal sheet of the present invention cannot bounce off the resistance seat, the circuit module forcibly disconnects the circuit, thereby ensuring the safety of the cigarette lighter and the automobile instrument.

Description

A car cigarette lighter with self-contained protection device

technical field

The invention belongs to the technical field of automobiles and relates to a car cigarette lighter, in particular to a car cigarette lighter with a protective device.

Background technique

A cigarette lighter is a car device whose main function is to light a cigarette. When the cigarette lighter is pressed in, the heating part is embedded in the bimetal sheet of the cigarette lighter socket, and a loop is formed inside, the circuit is turned on, and the resistance wire will be heated to a temperature sufficient to make the cigarette burn (1050-1100°C). , the user can use to light a cigarette. But now many cigarette lighters have a common problem, that is, when the bimetal sheet cannot pop out of the heating part of the cigarette lighter, the resistance wire is always heated, and when the temperature is too high, it will burn out the car instrument or other parts; A wire is added to the smoke device to cut off the power when the temperature is too high, but there is still a potential safety hazard. This is currently an intractable problem.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides a vehicle-mounted cigarette lighter with its own protection device. When the bimetal sheet fails to deform normally and bounces off the resistance seat, the circuit module forcibly disconnects the circuit to ensure that the cigarette lighter and the car instrument safety.

The invention includes a heating assembly and a cigarette lighter socket.

The heating assembly includes a positioning seat, a dust cover, a spring cover, a return spring, a guiding positioning tube, a connecting rod, a pull button, a resistance seat and a resistance wire; the positioning seat is open at the top and has a through hole at the bottom Cylindrical, the dust jacket is cylindrical with both ends open; the dust jacket is set outside the positioning seat, the spring cover is arranged on the top of the positioning seat, and is slidably connected with the inner wall of the positioning seat; the return spring , The guiding and positioning tube and the connecting rod are all arranged inside the positioning seat; the return spring is sleeved on the guiding and positioning tube; the guiding and positioning tube is sleeved on the connecting rod, and the bottom extends into the through hole at the bottom of the positioning seat inside, and is slidingly connected with the positioning seat; the tail of the connecting rod protrudes out of the spring cover and is fixed with the pull button; the resistance seat and the resistance wire are sequentially set on the head of the connecting rod, and one end of the resistance wire is embedded in the connecting rod In the slit of the head, the other end is fixed on the inner wall of the disc-shaped resistance seat.

The cigarette lighter socket includes a conductive screw rod, a conductive spring, a bimetallic sheet, a porcelain seat, a shell, a circuit board, a heat insulation box, a plastic seat, a lug, a wiring seat and a fastening nut. The conductive screw passes through the bimetal sheet, the ceramic base, the shell, the top of the heat insulation box, the circuit board, the bottom of the heat insulation box, the plastic seat, the lug and the wire socket in turn, and the tail passes through the shoulder and the bimetal Axially positioned, the head is threaded with a fastening nut.

The shell is cylindrical with an open top, and two bimetallic sheet protruding grooves are symmetrically opened on the side wall; a groove is opened on the top of the porcelain base, and a conductive spring slot is opened on the side wall of the groove , the other side wall is provided with a conductive spring auxiliary installation slot, and a wire through hole is opened near the conductive spring slot; the bottom of the bimetallic sheet is embedded in the groove on the top of the porcelain base, and the metal sheets of the two arms extend out correspondingly. The bimetal sheet protrudes out of the slot; the bottom of the porcelain seat is embedded in the bottom inner wall of the shell.

The spring coil at the bottom of the conductive spring is bent to form a circlip structure for the hole, which is inserted into the conductive spring clamping groove and the conductive spring auxiliary installation groove of the porcelain base. The dust jacket of the heating assembly is set in the shell, and the resistance seat is set on the top of the bimetal sheet.

The heat insulation box includes a box body and a bottom cover, and the teeth of the bottom cover are embedded in the tooth grooves of the box body; the box body is arranged at the bottom of the casing; a plastic seat is provided on the bottom cover for installation hole, the plastic seat installation block on the top of the plastic seat is embedded in the plastic seat installation hole of the bottom cover; the lug is an inverted L-shaped bracket, and the top is embedded in the wiring seat installation groove at the bottom of the plastic seat; the wiring seat is set At the bottom of the lug; one end of the connection wire of the terminal block is connected to the lug, and the other end is connected to the terminal block; the fastening nut compresses the terminal block.

The circuit board is arranged in the box body of the heat insulation box, and the thermistor on the circuit board passes through the bottom cover, the plastic seat and the lug in turn, and is arranged close to the fastening nut; the circuit board is welded with grounding wires, wiring Sheet connection wires and conductive spring connection wires; the grounding wires pass through the bottom cover and the plastic seat in turn, and are connected to the vehicle body; the connection piece connection wires pass through the bottom cover and the plastic seat in turn, and are welded to the lugs; The connecting wires of the conductive spring pass through the wire through holes of the box body, the casing and the porcelain base in turn, and are connected with the conductive spring.

The tail of the connecting rod is threadedly connected with the embedded nut, and the embedded nut is embedded in the pull button; the middle part of the connecting rod is provided with a positioning shaft section, and the upper shoulder of the positioning shaft section is close to the bottom of the guiding positioning tube; the resistance A mica sheet is arranged between the seat and the lower shoulder of the positioning shaft section of the connecting rod, and between the resistance seat and the resistance wire.

The bottom of the housing is provided with a plurality of heat insulation box positioning protrusions; the top of the box body is provided with a plurality of heat insulation box positioning holes, and the number of heat insulation box positioning holes is equal to the number of heat insulation box positioning protrusions ; Each heat insulation box positioning protrusion of the housing is respectively embedded in the corresponding heat insulation box positioning hole.

The conductive spring is a conical coil spring.

A mica sheet is arranged between the wiring seat and the wiring piece.

The heat insulation box adopts heat insulation insulation material.

The circuit module of the circuit board includes a power supply module, a processor chip U1, a current control module and a temperature protection module; the processor chip U1 adopts a PIC12F675 chip.

The power module includes a diode D1, a step-down chip U2, a first capacitor C1, a second capacitor C2, a first resistor R1 and a second resistor R2; the +12V voltage output by the battery is connected to the wire and the circuit through the lug and the lug The voltage input terminal E2 of the board is connected, the voltage input terminal E2 of the circuit board is connected with the positive pole of the diode D1, and the negative pole of the diode D1 is connected with the Vin end of the step-down chip U2 and one end of the first capacitor C1; The ADJ end is connected to one end of the first resistor R1 and one end of the second resistor R2; the other end of the first resistor R1 is connected to the other end of the first capacitor C1 and one end of the second capacitor C2 and grounded; the Vout of the step-down chip U2 The end is connected with the other end of the second capacitor C2, the 1 pin of the processor chip U1 and the other end of the second resistor R2, and outputs +5V voltage; the step-down chip U2 adopts the spx1117 chip.

The current control module includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, an NMOS transistor Q1 and a third capacitor C3; the processor The 2 pins of the chip U1 are connected to the LED, the 8 pins are grounded, and the 5 pins are suspended; the 3 pins of the processor chip U1 are connected to the g pole of the NMOS transistor Q1, and the d pole of the NMOS transistor Q1 is connected to the wire through a conductive spring. The interface E3 of the conductive spring is connected; the s pole of the NMOS transistor Q1 is connected to one end of the seventh resistor R7, one end of the third resistor R3, one end of the fourth resistor R4, one end of the fifth resistor R5 and one end of the sixth resistor R6; The other end of the seventh resistor R7 is connected to one end of the third capacitor C3, one end of the eighth resistor R8, and the 6 pin of the processor chip U1; the other end of the third resistor R3 is connected to the other end of the fourth resistor R4 One end, the other end of the fifth resistor R5, the other end of the sixth resistor R6, the other end of the eighth resistor R8 and the other end of the third capacitor C3 are connected to one end of the ground wire, and the other end of the ground wire is connected to the vehicle body E1 and ground.

The temperature protection module includes a fourth capacitor C4, a ninth resistor R9, a tenth resistor R10, and a thermistor R11; one end of the ninth resistor R9 is connected to one end E5 of the thermistor R11 and 1 of the processor chip U1. Pin connection, the other end is connected with the 4 pins of the processor chip U1 and one end of the fourth capacitor C4; one end of the tenth resistor R10 is connected with the 7 pins of the processor chip U1 and the other end E4 of the thermistor R11 connection; the other end of the fourth capacitor C4 and the other end of the tenth resistor R10 are grounded.

Beneficial effects of the present invention:

1. On the premise of realizing the basic functions of the cigarette lighter, the present invention adds a circuit module, and uses the timer and AD sampling function inside the chip to control and protect the cigarette lighter; when the bimetal sheet cannot deform normally and pops off the resistance seat , the circuit module forcibly disconnects the circuit to ensure the safety of the cigarette lighter and the car instrument.

2. The heat insulation box of the present invention adopts heat insulation materials to avoid damage and interference to the circuit module during the working process of the cigarette lighter, increase its operation stability, and improve product reliability.

Description of drawings

Fig. 1 is the perspective view of each part among the present invention;

Fig. 2 is a sectional view of the overall structure of the present invention;

Fig. 3 is the perspective view of housing in the present invention;

Fig. 4 is the perspective view of porcelain seat among the present invention;

Fig. 5 is the perspective view of conductive spring among the present invention;

Figure 6-1 is a perspective view of the heat insulation box in the present invention;

Figure 6-2 is a perspective view of the box body of the heat insulation box in the present invention;

Fig. 7 is the perspective view of plastic seat among the present invention;

Fig. 8 is the perspective view of circuit board among the present invention;

Fig. 9 is an installation perspective view of connecting wires of a circuit board in the present invention;

Fig. 10 is a circuit diagram of the circuit board except the temperature protection module in the present invention;

Fig. 11 is a circuit diagram of the temperature protection module of the circuit board in the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 and 2, a car cigarette lighter with a built-in protection device includes a heating component and a cigarette lighter socket.

The heating assembly includes a positioning seat 1, a dust cover 2, a spring cover 3, a return spring 4, a guiding and positioning tube 5, a connecting rod 6, a pull button 8, a resistance seat 9 and a resistance wire 10; the positioning seat 1 is open at the top and open at the bottom. It is cylindrical with through holes, and the dustproof cover 2 is cylindrical with both ends open; The inner wall is slidingly connected; the return spring 4, the guide positioning tube 5 and the connecting rod 6 are all arranged inside the positioning seat 1; the return spring 4 is set on the guide positioning tube 5; the guide positioning tube 5 is set on the connecting rod 6 , the bottom extends into the through hole at the bottom of the positioning seat 1, and is slidably connected with the positioning seat 1; the tail of the connecting rod 6 extends out of the spring cover 3, and is threaded with the embedded nut 7, and the embedded nut 7 is embedded in the pull button 8 Inside; the middle part of the connecting rod 6 is provided with a positioning shaft section, and the upper shoulder of the positioning shaft section is close to the bottom of the guiding positioning tube 5; the resistance seat 9 and the resistance wire 10 are sequentially sleeved on the head of the connecting rod 6, and the resistance wire 10 One end is embedded in the slit of the head of the connecting rod 6, and the other end is fixed on the inner wall of the disc-shaped resistance seat 9. A mica sheet 11 is provided between the resistance seat 9 and the lower shoulder of the positioning shaft section of the connecting rod 6 , and between the resistance seat 9 and the resistance wire 10 .

The cigarette lighter socket includes a conductive screw 12, a conductive spring 13, a bimetallic sheet 14, a ceramic base 15, a housing 16, a circuit board 17, a heat insulation box 18, a plastic base 19, a lug 20, a wiring base 21 and a fastening nut twenty three. The conductive screw 12 passes through the bimetal 14, the porcelain base 15, the housing 16, the top of the heat insulation box 18, the circuit board 17, the bottom of the heat insulation box 18, the plastic seat 19, the lug 20 and the wiring seat 21, and the tail Through the axial positioning of the shoulder and the bimetal 14, the head is threadedly connected with the fastening nut 23.

As shown in Figures 2, 3 and 4, the shell 16 is a cylindrical shape with an open top, two positioning protrusions 16-1 for the heat insulation box are arranged symmetrically at the bottom, and two bimetal sheet protruding grooves are arranged symmetrically on the side wall 16-2; the top of the porcelain base 15 is provided with a groove 15-1, one side wall of the groove 15-1 is provided with a conductive spring clamping groove 15-2, and the other side wall is provided with a conductive spring auxiliary installation groove 15-3 , there is a wire through hole 15-4 near the conductive spring slot 15-2; the bottom of the bimetal 14 is embedded in the groove 15-1 on the top of the porcelain base 15, and the metal sheets of the two arms extend out of the corresponding bimetal respectively. The sheet protrudes from the groove 16-2; the bottom of the porcelain seat 15 is embedded in the bottom inner wall of the housing 16.

As shown in Figures 2, 4 and 5, the conductive spring 13 is a conical helical spring, and the coil at the bottom is bent to form a circlip structure 13-1 for the hole, which is inserted into the conductive spring slot 15-2 of the porcelain seat and conducts The spring assist is installed in the groove 15-3. The dust jacket 2 of the heating assembly is set in the housing, and the resistance base 9 is set on the top of the bimetal 14 .

As shown in Figures 2, 6-1, 6-2 and 7, the heat insulation box 18 includes a box body 18-1 and a bottom cover 18-2, and the tooth inlay 18-3 of the bottom cover is embedded in the tooth inlay groove 18- of the box body. 5 inside; the top of the box body 18-1 is symmetrically provided with two heat insulation box positioning holes 18-6, and the two heat insulation box positioning protrusions 16-1 of the shell are respectively embedded in the corresponding heat insulation box positioning holes 18-6 Inside; the bottom cover 18-2 is provided with a plastic seat installation hole 18-4, and the plastic seat installation block 19-1 on the top of the plastic seat 19 is embedded in the plastic seat installation hole 18-4 of the bottom cover; the lug 20 is an inverted L shaped bracket, the top is embedded in the wiring seat installation groove 19-2 at the bottom of the plastic seat 19; One end is connected to the lug 20, and the other end is connected to the terminal block 21; the fastening nut 23 compresses the terminal block 20.

As shown in Figures 2, 8 and 9, the circuit board 17 is arranged in the box body 18-1 of the heat insulation box, and the thermistor R11 on the circuit board 17 passes through the bottom cover 18-2, the plastic seat 19 and the lug in sequence 20, and set it close to the fastening nut 23; the circuit board 17 is welded with a grounding wire 17-1, a lug connecting wire 17-2 and a conductive spring connecting wire 17-3; the grounding wire 17-1 passes through the bottom cover 18 in turn -2 and the plastic seat 19 are connected with the car body; the lug connecting wire 17-2 passes through the bottom cover 18-2 and the plastic seat 19 in turn, and is welded with the lug 20; the conductive spring connecting wire 17-3 passes through the box successively The lead through hole 15-4 of body 18-1, housing 16 and porcelain base is connected with conductive spring 13. The heat insulation box 18 is made of ceramics, so as to prevent the cigarette lighter from interfering with and damaging the circuit board 17 during operation, and increase the operation stability of the protection device; the mica sheet 11 has the functions of heat insulation and insulation.

As shown in FIGS. 10 and 11 , the circuit modules of the circuit board 17 include a power supply module, a processor chip U1 , a current control module and a temperature protection module; the processor chip U1 is a PIC12F675 chip.

The power module includes a diode D1, a step-down chip U2, a first capacitor C1, a second capacitor C2, a first resistor R1 and a second resistor R2; the +12V voltage output by the storage battery passes through the lug 20 and the lug connecting wire 17-2 and The voltage input terminal E2 of the circuit board 17 is connected, the voltage input terminal E2 of the circuit board 17 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the Vin terminal of the step-down chip U2 and one end of the first capacitor C1; the step-down chip U2 The ADJ end of the first resistor R1 is connected to one end of the second resistor R2; the other end of the first resistor R1 is connected to the other end of the first capacitor C1 and one end of the second capacitor C2 and grounded; the step-down chip U2 The Vout end is connected with the other end of the second capacitor C2, the 1 pin of the processor chip U1 and the other end of the second resistor R2, and outputs +5V voltage; wherein, the step-down chip U2 adopts the spx1117 chip.

The current control module includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, an NMOS transistor Q1 and a third capacitor C3; 2 pins of the processor chip U1 The pins are connected to the LED, the 8 pins are grounded, and the 5 pins are suspended; the 3 pins of the processor chip U1 are connected to the g pole of the NMOS transistor Q1, and the d pole of the NMOS transistor Q1 is connected to the wire 17-3 and the conductive spring 13 through a conductive spring. The interface E3 is connected; the s pole of the NMOS transistor Q1 is connected to one end of the seventh resistor R7, one end of the third resistor R3, one end of the fourth resistor R4, one end of the fifth resistor R5 and one end of the sixth resistor R6; the seventh resistor The other end of R7 is connected to one end of the third capacitor C3, one end of the eighth resistor R8 and the 6 pin of the processor chip U1; the other end of the third resistor R3, the other end of the fourth resistor R4, the fifth resistor R5 The other end, the other end of the sixth resistor R6, the other end of the eighth resistor R8 and the other end of the third capacitor C3 are connected to one end of the ground wire 17-1, and the other end of the ground wire 17-1 is connected to the vehicle body E1 and grounded.

The temperature protection module includes a fourth capacitor C4, a ninth resistor R9, a tenth resistor R10 and a thermistor R11; one end of the ninth resistor R9 is connected to one end E5 of the thermistor R11 and the 1 pin of the processor chip U1, and the other One end is connected with pin 4 of the processor chip U1 and one end of the fourth capacitor C4; one end of the tenth resistor R10 is connected with the pin 7 of the processor chip U1 and the other end E4 of the thermistor R11; the end of the fourth capacitor C4 The other end and the other end of the tenth resistor R10 are both grounded.

The working principle of the car cigarette lighter with its own protection device:

Press the pull button 8 with the resistance wire 10, the resistance seat 9 is stuck in the bimetal 14, the whole cigarette lighter forms an electronic circuit, and the circuit heats the resistance wire 10; when heated to a certain temperature, the bimetal 14 deformation, the resistance seat 9 is ejected, and the user can light a cigarette. When the bimetallic strip 14 fails to deform normally and bounces off the resistance seat 9, the processor chip U1 of the circuit board 17 forcibly disconnects the circuit to ensure the safety of the cigarette lighter.

The working principle of the circuit module of the car cigarette lighter with its own protection device:

The timer and AD sampling function inside the processor chip U1 are used to control and protect the cigarette lighter, which can realize 18s power-off, power-off when the current is greater than 8.5A, and power-off when the temperature of thermistor R11 reaches 87°C. The working time of the qualified cigarette lighter is 11-16s, and the longest time is not more than 18s, so the circuit module of the cigarette lighter makes the cigarette lighter work for 18s and power off; after the cigarette lighter is installed in the car, the working voltage is 9-15V , the working current is about 7A, when the current is greater than 8.5A, the cigarette lighter will be powered off; similarly, when the temperature of the detected thermistor R11 reaches 87°C, the cigarette lighter will also be powered off.

Claims (7)

1. an automobile mounted cigar lighter that carries protective device, comprise heating component and cigarette lighter socket, it is characterized in that: described heating component comprises positioning seat, dirt-proof boot, spring cup, return spring, guide-localization pipe, connecting rod, pull-button, resistor block and resistance wire; Described positioning seat is the cylindrical shape that open-top, bottom offer through hole, and dirt-proof boot is all open cylindrical shapes of two ends; Described dirt-proof boot is nested with outside positioning seat, and spring cup is arranged on positioning seat top, and is slidably connected with the inwall of positioning seat; Return spring, guide-localization pipe and connecting rod are all arranged on positioning seat inside; Described return spring is nested with on guide-localization pipe; Described guide-localization pipe box is put on connecting rod, and bottom is stretched in the through hole of positioning seat bottom, and is slidably connected with positioning seat; The afterbody of connecting rod stretches out outside spring cup, and fixes with pull-button; Described resistor block and resistance wire are nested with the head at connecting rod successively, and one end of resistance wire embeds in the joint-cutting of connecting rod head, and the other end is fixed on the resistor block inwall of dish type;

Described cigarette lighter socket comprises conductive lever, power spring, bimetal leaf, porcelain seat, housing, circuit board, heat insulation box, plastic seat, lug plate, junction block and clamp nut; Described conductive lever is successively through bottom, plastic seat, lug plate and the junction block of the top of bimetal leaf, porcelain seat, housing, heat insulation box, circuit board, heat insulation box, and afterbody is by the shaft shoulder and bimetal leaf axial location, and head is threaded with clamp nut;

Described housing is the cylindrical shape of open-top, and sidewall symmetry offers two bimetal leafs and stretches out groove; The top of described porcelain seat offers groove, and a sidewall of groove offers power spring draw-in groove, and another sidewall offers power spring auxiliary mounting groove, near power spring draw-in groove place, offers wire through-hole; The bottom of described bimetal leaf embeds in the groove at porcelain seat top, and the sheet metal of two arms stretches out respectively corresponding bimetal leaf and stretches out outside groove; The bottom of described porcelain seat embeds the bottom interior wall of housing;

The spring coil of described power spring bottom is bent to form circlip for hole structure, snaps in the power spring draw-in groove and power spring auxiliary mounting groove of porcelain seat; The dirt-proof boot of described heating component is nested with in housing, and resistor block is arranged on bimetal leaf top;

Described heat insulation box comprises box body and bottom, and the dental inlay of bottom embeds in the dental inlay groove of box body; Described box body is arranged on the bottom of housing; On described bottom, offer plastic seat installing hole, the plastic seat mounting blocks at plastic seat top embeds in the plastic seat installing hole of bottom; Described lug plate is inverted L bracket, and top embeds in the junction block mounting groove of plastic seat bottom; Described junction block is arranged on lug plate bottom; One end that junction block connects wire is connected with lug plate, and the other end is connected with junction block; Clamp nut compresses junction block;

Described circuit board is arranged in the box body of heat insulation box, and the thermistor on circuit board passes bottom, plastic seat and lug plate successively, and is adjacent to clamp nut setting; On circuit board, being welded with earth lead, lug plate connects wire and is connected wire with power spring; Described earth lead through bottom and plastic seat, is connected with car body successively; Described lug plate connects wire successively through bottom and plastic seat, and welds with lug plate; Described power spring connects wire successively through the wire through-hole of box body, housing and porcelain seat, is connected with power spring.

2. a kind of automobile mounted cigar lighter that carries protective device according to claim 1, is characterized in that: the afterbody of described connecting rod is threaded with embedded nut, and embedded nut embeds in pull-button; The middle part of connecting rod is provided with location shaft part, and the upper shaft shoulder of location shaft part is adjacent to the bottom of guide-localization pipe; Between the lower shaft shoulder of the location shaft part of described resistor block and connecting rod, be equipped with mica sheet between resistor block and resistance wire.

3. a kind of automobile mounted cigar lighter that carries protective device according to claim 1, is characterized in that: the bottom of described housing is provided with a plurality of heat insulation box positioning convex; The top of described box body offers a plurality of heat insulation box locating holes, and the quantity of heat insulation box locating hole equates with the quantity of heat insulation box positioning convex; Each heat insulation box positioning convex of housing embeds respectively in corresponding heat insulation box locating hole.

4. a kind of automobile mounted cigar lighter that carries protective device according to claim 1, is characterized in that: described power spring is tapered coil spring.

5. a kind of automobile mounted cigar lighter that carries protective device according to claim 1, is characterized in that: between described junction block and lug plate, be provided with mica sheet.

6. a kind of automobile mounted cigar lighter that carries protective device according to claim 1, is characterized in that: described heat insulation box adopts partiting thermal insulation material.

7. a kind of automobile mounted cigar lighter that carries protective device according to claim 1, is characterized in that: the circuit module of described circuit board comprises power module, processor chips U1, current control module and temperature protection module; Described processor chips U1 adopts PIC12F675 chip;

Described power module comprises diode D1, step-down chip U2, the first capacitor C 1, the second capacitor C 2, the first resistance R 1 and the second resistance R 2; Export+12V voltage of storage battery connects wire by lug plate and lug plate and is connected with the voltage input end E2 of circuit board, the voltage input end E2 of circuit board is connected with the positive pole of diode D1, and the negative pole of diode D1 is connected with the Vin end of step-down chip U2, one end of the first capacitor C 1; The ADJ end of described step-down chip U2 is connected with one end of the first resistance R 1 and one end of the second resistance R 2; The other end of the first resistance R 1 is connected with the other end of the first capacitor C 1 and one end of the second capacitor C 2 and ground connection; The Vout end of step-down chip U2 is connected with the other end of the other end of the second capacitor C 2,1 pin of processor chips U1 and the second resistance R 2, and output+5V voltage; Described step-down chip U2 adopts spx1117 chip;

Described current control module comprises the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, NMOS pipe Q1 and the 3rd capacitor C 3; 2 pins of described processor chips U1 meet LED, 8 pin ground connection, and 5 pins are unsettled; 3 pins of described processor chips U1 are connected with the g utmost point of NMOS pipe Q1, and the d utmost point of NMOS pipe Q1 connects wire by power spring and is connected with the interface E3 of power spring; The NMOS pipe s utmost point of Q1 and one end of the 7th resistance R 7, one end of the 3rd resistance R 3, one end of one end of the 4th resistance R 4, the 5th resistance R 5 and one end of the 6th resistance R 6 are connected; The other end of described the 7th resistance R 7 is connected with 6 pins of one end of the 3rd capacitor C 3, one end of the 8th resistance R 8 and processor chips U1; The other end of the other end of the other end of the other end of the other end of described the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 8th resistance R 8 and the 3rd other end of capacitor C 3 and one end of earth lead are connected, and the other end of earth lead is connected with car body E1 and ground connection;

Described temperature protection module comprises the 4th capacitor C 4, the 9th resistance R 9, the tenth resistance R 10 and thermistor R11; One end of described the 9th resistance R 9 is connected with one end E5 of thermistor R11 and 1 pin of processor chips U1, and the other end is connected with 4 pins of processor chips U1 and one end of the 4th capacitor C 4; One end of described the tenth resistance R 10 is connected with 7 pins of processor chips U1 and the other end E4 of thermistor R11; The equal ground connection of the other end of the other end of the 4th capacitor C 4 and the tenth resistance R 10.

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