Energy-saving flashlight and its control circuit

Abstract

The invention discloses an energy-saving flashlight and a control circuit thereof. The energy-saving flashlight comprises: a shell; a screw cap threadedly connected to one end of the shell, a transparent glass mounted on the screw cap; an end cap fixedly connected to the other end of the shell; a sleeve arranged in the shell; through the cooperation of a power-generating float, a gear and a rack; the flashlight shakes during movement, so the sealed cavity shakes, the liquid level of the internal energy storage liquid fluctuates, the power-generating float floats up and down through the fluctuation of the liquid level, the power-generating float drives the rack to move up and down, the up and down movement of the rack drives the gear and the rotating shaft to rotate, the first rotating wheel is driven to rotate through the rotation of the rotating shaft, the belt is driven to rotate through the first rotating wheel, the second rotating wheel is driven to rotate through the belt, the kinetic energy and potential energy are converted into electrical energy for charging a rechargeable battery, so that the LED lamp is generated through the anode pole for lighting the LED lamp, and the rechargeable battery is provided with energy according to the principle of energy conversion and hydropower generation, which is green and environmentally friendly.

Description

Technical Field

[0001] The invention belongs to the technical field of flashlights, in particular to an energy-saving flashlight and a control circuit thereof. Background Art

[0002] A flashlight, also known as a flashlight, is a handheld electronic lighting tool. It consists of a battery-powered bulb, a focusing reflector, and a handle-type housing for handholding. As flashlights are widely used in various operations such as forestry and engineering, flashlights with a single function can no longer meet people's requirements, and a single power supply method cannot meet work needs.

[0003] A Chinese patent with publication number CN205504568U discloses an energy-saving multifunctional flashlight, including a flashlight housing, a cathode terminal, a charging power source, an anode interface, a metal reflector, an LED energy-saving lamp, a second conductive metal belt, a switch button, a metal slide key and a first conductive metal belt; a cathode terminal is installed at the center of the inner right surface wall of the flashlight housing, and a charging socket is provided at the center of the right side of the front surface wall of the flashlight housing, a metal slide key is provided on the left side of the first conductive metal belt, and a switch button is provided on the left side of the metal slide key. The beneficial effects of the utility model are: the energy-saving multifunctional flashlight does not require an external battery, and also has a rechargeable power supply for energy storage. It replaces ordinary lighting lamps with energy-saving LED lamps, which prolongs the service life of the bulb, and is green, environmentally friendly, economical, safe and durable. The energy-saving multifunctional flashlight has high power generation efficiency and low power consumption. The flashlight is provided with an electric energy display screen. At the same time, the charging socket provided in the flashlight is a universal mobile phone socket, and the mobile phone can also be charged.

[0004] In the above technology, flashlights are mostly used for outdoor lighting. When used for outdoor lighting, short-term battery power supply is not enough for long-term work. Although some flashlights are also powered by solar panels, the solar panels are fixed to the flashlight casing. When the light is shining to store electricity, the power supply inside the flashlight may be damaged due to excessive heat while charging, which is not convenient for long-term use of energy storage.

[0005] Therefore, the present invention provides an energy-saving flashlight. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: an energy-saving flashlight described in the present invention comprises:

[0008] case;

[0009] Screw cap threaded onto one end of the housing

[0010] Clear glass mounted on a screw cap;

[0011] an end cover fixedly connected to the other end of the shell;

[0012] A sleeve disposed in the housing;

[0013] two rechargeable batteries mounted in the sleeve;

[0014] LED light provided in the screw cap via anode pole;

[0015] An energy storage mechanism provided at one end of the sleeve;

[0016] The energy storage mechanism includes a sealed cavity fixedly connected to one end of the sleeve near the end cover; energy storage liquid is provided in the sealed cavity; a connecting plate is fixedly connected to the top of the sealed cavity; two rotating shafts are rotatably connected between the sealed cavity and the connecting plate through bearings, and gears are fixedly connected to the rotating shafts; a sliding component is provided on one side of the gears, and racks are slidably connected to the sliding components, and the gears are meshed with adjacent racks; a power generation float is fixedly connected to the bottom of the racks through a soft rope; a first rotating wheel is fixedly connected to one end of the rotating shaft, and an input end of one of the rechargeable batteries is rotatably connected to a second rotating wheel through a rotating shaft, driving a belt to be sleeved between the first rotating wheel and the second rotating wheel.

[0017] Preferably, the sliding assembly includes a side plate and a sliding column; two side plates are provided and are both fixedly connected to one side of the rack; the sliding column is fixedly connected to the inner wall of the sealing cavity, and the side plates are both slidably connected to the sliding column.

[0018] Preferably, one end of the sleeve is fixedly connected to a fixing plate, and the fixing plate is fixedly connected to the inner wall of the shell; the anode pole is fixedly connected to the fixing plate, and a reflector is threadedly connected to the anode pole; the outer side wall of the other end of the sleeve is fixedly connected to a fixing sleeve, and the fixing sleeve is fixedly connected to the inner wall of the shell; a cathode pole is fixedly connected between the shell and the sleeve; and a charging plug is slidably connected to the end cover.

[0019] Preferably, the outer side wall of the shell is rotatably connected to the first bracket via a pin; a first groove is provided on the side wall of the first bracket close to the shell, and the second bracket is rotatably connected in the first groove via a pin; second grooves are provided on both side walls of the first bracket away from the connecting end; and a third bracket is rotatably connected in the second groove via a pin.

[0020] Preferably, two vertical plates are fixedly connected to one end of the outer wall of the shell near the end cover; the vertical plates are slidably connected to limiting columns, and the two limiting columns are fixedly connected to limiting plates; springs are sleeved on the outer sides of the limiting columns; the two ends of the spring are respectively fixedly connected to the vertical plate and the limiting plate; the first bracket cooperates with the limiting plate.

[0021] Preferably, a slide groove is provided on the shell, and the slide groove extends to the end cover; a slider is slidably connected in the slide groove, and the outer wall of the slider is fixedly connected to the solar panel; a magnet is fixedly connected to the inner wall of the solar panel, and the solar panel is electrically connected to the rechargeable battery.

[0022] Preferably, a sealing ring is fixedly connected to the inner wall of the rotary cover, and the sealing ring is used for waterproofing.

[0023] Preferably, a fluorescent ring is fixedly connected to the outer side wall of the screw cap, and the fluorescent ring is used for prompting.

[0024] Preferably, a switch button is installed on the outer side wall of the shell, and the switch button is electrically connected to the rechargeable battery; a display screen is provided on one side of the switch button, and the display screen is used to display the power level.

[0025] Preferably, the outer side of the shell is covered with a sheath, and the sheath is set to have a frosted surface.

[0026] The present invention also provides a control circuit for an energy-saving flashlight, the control circuit comprising:

[0027] A buck circuit, wherein the buck circuit is connected to an energy storage mechanism;

[0028] A hybrid mode charging circuit is connected to the buck circuit, and the hybrid mode charging circuit is connected to a rechargeable battery.

[0029] Preferably, the hybrid mode charging circuit includes a constant current generating circuit, a duty cycle generating circuit, an internal resistance compensation circuit, a state switching control circuit and a temperature protection circuit connected to each other;

[0030] The mixed mode charging circuit is used to charge the rechargeable battery by switching to one of trickle charging, constant current charging, fast pulse charging and slow pulse charging according to the voltage of the rechargeable battery.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. The energy-saving flashlight described in the present invention cooperates with a power-generating float, a gear and a rack, and cooperates with a first rotating wheel, a second rotating wheel and a belt. During the movement, the flashlight shakes, so the sealed chamber shakes. The shaking of the sealed chamber causes the liquid level of the energy storage liquid inside to fluctuate. The power-generating float floats up and down due to the fluctuation of the liquid level, and the power-generating float drives the rack to move up and down. The up and down movement of the rack drives the gear and the rotating shaft to rotate. The rotation of the rotating shaft drives the first rotating wheel to rotate, and the belt drives the first rotating wheel to rotate. The belt drives the second rotating wheel to rotate, and the kinetic energy and potential energy are converted into electrical energy for charging the rechargeable battery, thereby generating electricity for the LED lamp through the anode pole for lighting the LED lamp. The power-generating float, gear and rack cooperate according to the principle of energy conversion and hydropower generation to provide energy for the rechargeable battery. This is green and environmentally friendly, and the LED lamp is energy-saving and environmentally friendly.

[0033] 2. An energy-saving flashlight described in the present invention needs to be fixed in a position through the cooperation of the first bracket, the second bracket and the third bracket. When the first bracket, the second bracket and the third bracket provided by the present invention are in use, the first bracket needs to be spread out, and then the second bracket is taken out from the first bracket and rotated to a suitable angle, and finally the two third brackets are taken out and rotated to a suitable angle, and the first bracket, the second bracket and the third bracket are spread out and the flashlight is fixed, which is convenient for the work of the staff and does not need to hold the flashlight all the time; when the first bracket is not spread out, it needs to be fixed to the outside of the shell, and after the first bracket and other brackets are combined, the limit plate is pulled upward, and the limit column is pulled upward through the limit plate, the spring is stretched, and the gap between the limit plate and the shell becomes larger, the first bracket is brought close to one side of the shell, and the limit plate is slowly lowered. Under the action of the spring, the limit plate and the limit column are quickly reset to fix the first bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] Figure 1 is a stereogram of the present invention;

[0036] Figure 2 is a cross-sectional view of the present invention;

[0037] Figure 3 is a cross-sectional view of the sealing cavity in the present invention;

[0038] Figure 4 It is a schematic diagram of the structure of the gear and rack in the present invention;

[0039] Figure 5 It is a schematic diagram of the structure in which the first bracket, the second bracket and the third bracket are stretched out in the present invention;

[0040] Figure 6It is a schematic diagram of the structure in which the first bracket, the second bracket and the third bracket are combined in the present invention;

[0041] Figure 7 It is a structural schematic diagram of a vertical plate cross section in the present invention;

[0042] Figure 8 It is a structural schematic diagram of the slider in the present invention;

[0043] Fig. 9 It is a schematic diagram of the structure enlarged at A in the present invention;

[0044] Fig.10 It is a system block diagram of a control circuit composed of a step-down Buck circuit and a hybrid mode charging circuit in the present invention;

[0045] Fig.11 This is a diagram of the buck circuit architecture in the present invention;

[0046] Fig.12 is a circuit topology diagram of the hybrid mode charging circuit in the present invention;

[0047] Fig.13 It is a charging flow chart of the present invention;

[0048] Fig.14 It is a schematic diagram of the energy-saving flashlight of the present invention in a straight line state;

[0049] Fig.15 is a schematic diagram of the L-shaped state of the energy-saving flashlight of the present invention;

[0050] Fig.16 This is a schematic diagram (partial cross-sectional view) of the assembly of the barrel assembly and the barrel head assembly of the energy-saving flashlight of the present invention.

[0051] In the figure: 1, shell; 11, end cover; 12, charging plug; 13, cathode pole; 14, fixing plate; 15, reflector; 16, anode pole; 17, LED light; 18, switch button; 19, display screen; 110, fixing sleeve; 2, screw cap; 21, fluorescent ring; 22, transparent glass; 23, sealing ring; 3, sheath; 31, solar panel; 32, slide groove; 33, slider; 4, sleeve; 41, charging Battery; 42, power generation float; 43, rotating shaft; 431, first rotating wheel; 432, belt; 433, second rotating wheel; 44, gear; 45, rack; 46, connecting plate; 47, side plate; 48, sliding column; 49, sealing chamber; 5, first bracket; 51, second bracket; 52, first groove; 53, third bracket; 54, second groove; 55, limit plate; 56, vertical plate; 57, limit column; 58, spring. DETAILED DESCRIPTION

[0052] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0053] Embodiment 1

[0054] like Figures 1 to 9 As shown, an energy-saving flashlight according to an embodiment of the present invention comprises: a housing 1; a screw cap 2 threadedly connected to one end of the housing 1; a transparent glass 22 mounted on the screw cap 2; an end cap 11 fixedly connected to the other end of the housing 1; a sleeve 4 arranged in the housing 1; two rechargeable batteries 41 installed in the sleeve 4; an LED lamp 17 arranged in the screw cap 2 via an anode pole 16; an energy storage mechanism arranged at one end of the sleeve 4; the energy storage mechanism comprises a sealed cavity 49 fixedly connected to one end of the sleeve 4 close to the end cap 11; an energy storage liquid is arranged in the sealed cavity 49; a connecting plate 46 is fixedly connected to the top of the sealed cavity 49; the sealed cavity There are two rotating shafts 43 rotatably connected between 49 and the connecting plate 46 through bearings, and gears 44 are fixedly connected to the rotating shafts 43; a sliding component is provided on one side of the gear 44, and a rack 45 is slidably connected to the sliding component, and the gears 44 are meshed with adjacent racks 45; the bottom of the rack 45 is fixedly connected to the power generation float 42 through a soft rope; one end of the rotating shaft 43 is fixedly connected to the first rotating wheel 431, and the input end of one of the rechargeable batteries 41 is rotatably connected to the second rotating wheel 433 through a rotating shaft, driving a belt 432 provided between the first rotating wheel 431 and the second rotating wheel 433.

[0055] In the prior art, flashlights are mostly used for outdoor lighting. When used for outdoor lighting, short-term battery power supply is not enough for long-term work. Although some existing flashlights are also powered by solar panels 31, the solar panels 31 are fixed to the flashlight housing. When the light is shining to store electricity, the power supply inside the flashlight may be damaged due to excessive heat while charging, which is not convenient for long-term use of energy storage. When the energy storage mechanism provided by the present invention is used, the flashlight shakes during the movement, so the sealed cavity 49 shakes. The sealed cavity 49 shakes, and the liquid level of the internal energy storage liquid fluctuates. The power generation float 42 floats up and down through the fluctuation of the liquid level, and the power generation float 42 drives the gear The rack 45 moves up and down, and the up and down movement of the rack 45 drives the gear 44 and the rotating shaft 43 to rotate. The rotation of the rotating shaft 43 drives the first rotating wheel 431 to rotate, and the belt 432 drives the second rotating wheel 433 to rotate through the first rotating wheel 431. The kinetic energy and potential energy are converted into electrical energy for charging the rechargeable battery 41, so that the LED lamp 17 is generated through the anode pole 16 for lighting the LED lamp 17. The power generation float 42, the gear 44 and the rack 45 cooperate according to the principle of energy conversion and hydropower generation to provide energy for the rechargeable battery 41, which is green and environmentally friendly, and the LED lamp 17 is energy-saving and environmentally friendly.

[0056] like Figure 4 As shown, the sliding assembly includes a side plate 47 and a sliding column 48; two side plates 47 are provided, both of which are fixed to one side of the rack 45; the sliding column 48 is fixed to the inner wall of the sealing cavity 49, and the side plates 47 are slidably connected to the sliding column 48.

[0057] When the sliding column 48 and the side plate 47 provided by the present invention are in use, the rack 45 drives the side plate 47 to slide on the sliding column 48 during the movement of the rack 45, and the sliding column 48 limits the rack 45 in the vertical direction.

[0058] like Figure 2 As shown, one end of the sleeve 4 is fixedly connected to a fixing plate 14, and the fixing plate 14 is fixedly connected to the inner wall of the shell 1; the anode pole 16 is fixedly connected to the fixing plate 14, and a reflector 15 is threadedly connected to the anode pole 16; the outer side wall of the other end of the sleeve 4 is fixedly connected to a fixing sleeve 110, and the fixing sleeve 110 is fixedly connected to the inner wall of the shell 1; a cathode pole 13 is fixedly connected between the shell 1 and the sleeve 4; and a charging plug 12 is slidably connected to the end cover 11.

[0059] The fixing plate 14 and the fixing sleeve 110 provided by the present invention are used to fix the sleeve 110 tube 4 when in use, providing a stable space for the rechargeable battery 41 and the energy storage mechanism; the reflector 15 is threadedly connected for easy replacement; when the charging plug 12 is not working, it slides in the end cover 11 without affecting the normal operation of the flashlight, and when it needs to be inserted into a socket for charging, it can be slid out for easy charging.

[0060] like Figure 5 and Figure 6 As shown, the outer wall of the shell 1 is rotatably connected to the first bracket 5 via a pin; the first bracket 5 is provided with a first groove 52 on the side wall close to the shell 1, and the second bracket 51 is rotatably connected to the first groove 52 via a pin; the first bracket 5 is provided with second grooves 54 on the two side walls away from the connecting end; the third bracket 53 is rotatably connected to the second groove 54 via a pin.

[0061] When the staff is performing inspection work, it is sometimes necessary to fix the flashlight in one position. When the first bracket 5, the second bracket 51 and the third bracket 53 provided by the present invention are used, the first bracket 5 needs to be opened, and then the second bracket 51 is taken out of the first bracket 5 and rotated to a suitable angle. Finally, the two third brackets 53 are taken out and rotated to a suitable angle. After the first bracket 5, the second bracket 51 and the third bracket 53 are opened and the flashlight is fixed, it is convenient for the staff to work without having to hold the flashlight all the time.

[0062] like Figure 6 and Figure 7As shown, two vertical plates 56 are fixedly connected to one end of the outer wall of the shell 1 close to the end cover 11; the vertical plates 56 are slidably connected to the limiting columns 57, and the two limiting columns 57 are fixedly connected to the limiting plates 55; the outer sides of the limiting columns 57 are sleeved with springs 58; the two ends of the spring 58 are respectively fixedly connected to the vertical plates 56 and the limiting plates 55; the first bracket 5 cooperates with the limiting plates 55.

[0063] When the limiting column 57 and the limiting plate 55 provided by the present invention are in use, when the first bracket 5 is not expanded, they need to be fixed on the outside of the shell 1. After the first bracket 5 and other brackets are combined, the limiting plate 55 is pulled upward, and the limiting column 57 is pulled upward through the limiting plate 55. The spring 58 is stretched, and the gap between the limiting plate 55 and the shell 1 becomes larger. The first bracket 5 is brought close to one side of the shell 1, and the limiting plate 55 is slowly lowered. Under the action of the spring 58, the limiting plate 55 and the limiting column 57 are quickly reset to fix the first bracket 5.

[0064] like Figure 1 and Figure 8 As shown, a slide groove 32 is provided on the shell 1, and the slide groove 32 extends to the end cover 11; a slider 33 is slidably connected in the slide groove 32, and a solar panel 31 is fixedly connected to the outer wall of the slider 33; a magnet is fixedly connected to the inner wall of the solar panel 31, and the solar panel 31 is electrically connected to the rechargeable battery 41.

[0065] The solar panel 31 provided by the present invention is used to provide an energy source for the rechargeable battery 41 when in use. When light is needed, the solar panel 31 is taken out from the slide groove 32 through the slider 33. After storing energy through light, it is clamped together by the cooperation of the slider 33 and the slide groove 32. The inner wall of the solar panel 31 is fixed with a magnet, and the outer side of the shell 1 is provided with an iron sheet. The cooperation between the magnet and the iron sheet fixes the solar panel 31 to the outer side of the shell 1 for charging the rechargeable battery 41. It is mostly used when the flashlight is working statically and the energy storage mechanism cannot continue to store energy for the rechargeable battery 41.

[0066] like Figure 2 As shown, a sealing ring 23 is fixedly connected to the inner wall of the rotary cover 2, and the sealing ring 23 is used for waterproofing.

[0067] When the sealing ring 23 provided by the present invention is in use, when the housing 1 and the rotary cover 2 are fixed, the housing 1 and the end cover 11 are sealed under the action of the sealing ring 23, thereby improving the sealing performance of the housing 1 for waterproofing.

[0068] like Figure 1 As shown, a fluorescent ring 21 is fixedly connected to the outer wall of the rotary cover 2, and the fluorescent ring 21 is used for prompting.

[0069] When the fluorescent ring 21 provided by the present invention is in use, at night when the surroundings are dark, the fluorescent ring 21 emits light, which makes it convenient for workers to quickly determine the position of the flashlight.

[0070] like Figure 1 As shown, a switch button 18 is installed on the outer wall of the housing 1, and the switch button 18 is electrically connected to the rechargeable battery 41; a display screen 19 is provided on one side of the switch button 18, and the display screen 19 is used to display the power level.

[0071] The switch button 18 provided by the present invention is used to switch the flashlight when in use, and the power level is displayed on the display screen 19, which is convenient for real-time detection of the power level of the rechargeable battery 41 and real-time understanding of the status of the rechargeable battery 41.

[0072] like Figure 1 As shown, the outer side of the housing 1 is provided with a sheath 3, and the sheath 3 is set to be a frosted surface.

[0073] When the protective cover 3 provided by the present invention is in use, the protective cover 3 is provided with a frosted surface, which is convenient for the staff to hold and is used for anti-slip.

[0074] Working principle: In the prior art, flashlights are mostly used for outdoor lighting. When used for outdoor lighting, short-term battery power supply is not enough for long-term work. Although some existing flashlights are also powered by solar panels 31, the solar panels 31 are fixed to the flashlight housing. When the light is shining to store electricity, the power supply inside the flashlight may be damaged due to excessive heat while charging, which is not convenient for long-term use of energy storage. When the energy storage mechanism provided by the present invention is used, the flashlight shakes during the movement, so the sealed cavity 49 shakes. The sealed cavity 49 shakes, and the liquid level of the internal energy storage liquid fluctuates. The power generation float 42 floats up and down through the fluctuation of the liquid level, and the power generation float 42 brings The movable rack 45 moves up and down, and the gear 44 and the rotating shaft 43 are driven to rotate through the up and down movement of the rack 45. The first rotating wheel 431 is driven to rotate through the rotation of the rotating shaft 43, and the belt 432 is driven to rotate through the first rotating wheel 431, and the second rotating wheel 433 is driven to rotate through the belt 432. The kinetic energy and potential energy are converted into electrical energy for charging the rechargeable battery 41, so that the LED lamp 17 is generated through the anode pole 16 for lighting the LED lamp 17. Through the cooperation of the power generation float 42, the gear 44 and the rack 45, according to the principle of energy conversion and hydropower generation, energy is provided for the rechargeable battery 41, which is green and environmentally friendly, and the LED lamp 17 is energy-saving and environmentally friendly;

[0075] When the staff is checking the work, sometimes it is necessary to fix the flashlight in one position. When the first bracket 5, the second bracket 51 and the third bracket 53 provided by the present invention are in use, it is necessary to open the first bracket 5, then take out the second bracket 51 from the first bracket 5 and rotate it to a suitable angle, and finally take out the two third brackets 53 and rotate them to a suitable angle, and wait for the first bracket 5, the second bracket 51 and the third bracket 53 to be opened and the flashlight is fixed, which is convenient for the staff to work without having to hold the flashlight all the time; when the first bracket 5 is not opened, it needs to be fixed to the outside of the shell 1, and after the first bracket 5 and other brackets are combined, the limit plate 55 is pulled up, and the limit column 57 is pulled up through the limit plate 55, the spring 58 is stretched, and the gap between the limit plate 55 and the shell 1 becomes larger, the first bracket 5 is brought close to one side of the shell 1, and the limit plate 55 is slowly lowered. Under the action of the spring 58, the limit plate 55 and the limit column 57 are quickly reset to fix the first bracket 5;

[0076] When illumination is needed, the solar panel 31 is taken out from the slide groove 32 through the slider 33. After illumination and energy storage, the solar panel 31 is clamped together through the cooperation of the slider 33 and the slide groove 32. A magnet is fixed to the inner wall of the solar panel 31, and an iron sheet is provided on the outer side of the shell 1. The cooperation between the magnet and the iron sheet fixes the solar panel 31 to the outer side of the shell 1 for charging the rechargeable battery 41. It is mostly used when the flashlight is working statically and the energy storage mechanism cannot continue to store energy for the rechargeable battery 41.

[0077] Embodiment 2

[0078] This second embodiment provides a control circuit for an energy-saving flashlight based on the energy-saving flashlight of the first embodiment. Specifically, the control circuit is used to connect the rechargeable battery 41, the solar panel 31 and the energy storage mechanism.

[0079] like Fig.10 As shown, the control circuit includes a buck circuit and a hybrid mode charging circuit. The buck circuit is connected to the energy storage mechanism / solar panel; the hybrid mode charging circuit is connected to the buck circuit, and the hybrid mode charging circuit is connected to the rechargeable battery. The hybrid mode charging circuit is used to switch to one of trickle charging, constant current charging, fast pulse charging and slow pulse charging to charge the rechargeable battery according to the voltage of the rechargeable battery.

[0080] In the present invention, the step-down Buck circuit provides a 3.6V power supply voltage, which has a small voltage difference from the fully charged level 3.4V of the rechargeable battery 41, so that the drain-source voltage drop of the power tube in the subsequent linear structure charging circuit is low, thereby reducing the subsequent charging power consumption.

[0081] In a preferred implementation, the buck circuit adopts hysteresis voltage mode control. When the load of the subsequent stage is light, the Buck circuit can be put into sleep mode through hysteresis control mode, and the power tube and control-related circuits can be turned off, so that the power consumption of the Buck circuit is reduced. In addition, the entire buck circuit adopts voltage control mode, without error amplifier, and there is no need to consider loop stability and related.

[0082] In a specific implementation, in a hybrid mode charging circuit, a pulse charging method is combined with a constant current and constant voltage charging method. The constant current and constant voltage charging control part realizes the form of trickle-constant current-constant voltage; the pulse charging control part uses pulses with constant current size, constant frequency, and variable duty cycle for charging. Preferably, the front section uses a larger duty cycle of 75%, and the back section uses a smaller duty cycle of 25%. Adding the pulse charging stage to the second half of the constant current control stage can reduce the polarization of the rechargeable battery caused by a longer constant current charging time, and can still maintain a faster charging speed. The method of first fast pulses and then slow pulses in the pulse control is more friendly to the health of the rechargeable battery that is close to full charge.

[0083] like Fig.11 As shown, the designed Buck circuit has a large input voltage range, and most of the internal control circuit modules require a stable power supply, so a stable power rail is established through the internal power rail circuit (INTERNAL RAIL) to provide a power rail from CAP to VIN for the drive circuit of the upper power tube MP and a power rail from GND to VIN2 for the drive circuit of the lower tube MN.

[0084] Specifically, the undervoltage lockout circuit (UVLO) detects whether the input voltage VIN is undervoltage. When the input voltage VIN is not undervoltage, the buck circuit starts to work normally, and the bandgap reference voltage source circuit (BGP) starts to establish a reference voltage output V ref 、V ref_o It also provides bias current for other circuit modules. When the input voltage VIN is undervoltage, the enable signal is low level and the Buck circuit does not work.

[0085] The output signal generated by the logic control part (BUCK CONTROL) controls the drive circuit, thereby controlling the periodic on and off of the upper and lower power tubes to obtain a stable output voltage. The logic control part performs logic synthesis on the peak current comparator output (CSE_VO), the reverse current comparator output (ZCD_VO), and the sleep control module output (SLEEP_VO) to generate the control signals P_Driver and N_Driver of the drive circuit.

[0086] The sleep control module (SLEEP) outputs the voltage V OUTThe sampling value and the reference voltage V ref_o Perform hysteresis comparison, when the output voltage V OUT The high threshold V H When the output voltage is lower than the low threshold value V L When the circuit enters sleep mode, the circuit leaves sleep mode and re-enters normal working state. When the circuit enters sleep mode, the modules related to power supply voltage and current bias establishment are still working, while the circuits related to the control part are turned off, thereby reducing the static power consumption of the overall circuit. The high and low thresholds of the output voltage designed in this paper are ±12mV of the rated value respectively.

[0087] The peak current comparator (CSE) limits the output current I L According to the peak current of 260mA set in this paper, the SW point potential when the inductor current reaches the peak value is calculated, and then the SW point potential is compared with the set voltage value to generate a current limiting control signal, which is finally input to the logic control part for processing. When the inductor current reaches the peak value, a gate control signal to shut down the upper power tube is generated, and the inductor current I L Start decreasing from the peak current.

[0088] In the specific implementation, the control of the buck circuit mainly includes a hysteresis voltage comparison module, a peak current detection part and a reverse current comparator. The hysteresis voltage control module samples the output voltage V OUT , its feedback voltage V FB It is compared with the set upper and lower thresholds to generate a control signal to regulate the shutdown and conduction of the upper and lower power tubes. L For output capacitor C OUT The charging speed or the discharge speed of the output capacitor to the load is different, that is, the output voltage V OUT The slope of change is different, so the time to encounter the upper and lower thresholds varies. Therefore, the hysteresis voltage mode control has no fixed frequency and is essentially pulse frequency modulation (PFM), with a simple structure and fast transient response speed.

[0089] Table 1 Correspondence between voltage and charging mode selection

[0090] Rechargeable battery voltage <![CDATA[V BAT <V L ]]> <![CDATA[V L <V BAT <V M1 ]]> <![CDATA[V M1 <V BAT <V M2 ]]> <![CDATA[V M2 <V BAT <V H ]]> <![CDATA[V BAT >In H ]]> Charging Mode Trickle Constant current Fast Pulse Slow Pulse Charging End

[0091] Combined with Table 1, the voltage VBAT of the charging battery 14 is low, lower than V L When the battery voltage V BAT Reach V L When the battery voltage V BATReach the preset V M1 When the battery voltage V BAT Reach the preset V M2 When the battery voltage VBAT reaches the full charge level V H When the voltage is high, the battery enters the constant voltage stage until the battery is fully charged. L 、V M1 、V M2 、V H It is the reference potential when the state is switched.

[0092] like Fig.12 As shown, the hybrid charging circuit of the present invention is composed of a constant current generating circuit, a duty cycle generating circuit, an internal resistance compensation circuit, a state switching control circuit and a temperature protection circuit.

[0093] Specifically, in the circuit principle of the present invention, trickle-constant current-pulse-constant voltage charging of rechargeable batteries is mainly achieved by two control circuits. One part is a linear control constant current and constant voltage circuit, which can realize trickle charging when the voltage of the rechargeable battery is low and subsequent constant current and constant voltage charging, that is, it corresponds to the constant current generating circuit; the other part is the pulse charging control part, which realizes pulse charging of a constant current for the rechargeable battery, and the duty cycle generating circuit obtains 75% and 25% pulse signals to realize a combination of fast and slow pulses. Specifically, as Fig.12 As shown, the two-part control circuit corresponds to two power tubes MP1 and MP2 connected in series and their corresponding two gate control branches. The control signal is generated by sampling the charging battery voltage and comparing it with multiple reference potential points to complete the multi-stage charging process, that is, the state switching control circuit completes the relevant comparison.

[0094] In the specific implementation, regarding the working principle of the internal resistance compensation circuit, the longer the charging time of the rechargeable battery is, the higher the voltage V BAT The closer to full charge, the internal resistance of the rechargeable battery will gradually increase, and the original full charge level V H Calibration is performed through an internal resistance compensation circuit.

[0095] In the present invention, the temperature protection circuit is used to shut down the charging circuit in the case of too low temperature or too high temperature, so as to perform temperature protection on the rechargeable battery.

[0096] refer to Fig.12 , the present invention specifically describes each port and signal:

[0097] (1)V BK is the output of the previous Buck circuit, V BAT is the charging battery voltage, βV BAT is the sampling voltage of the charging battery, βV BKThe output sampling voltage of the front-stage Buck circuit, V SET is the constant current charging size setting signal, Freq is the frequency signal, V RTC is the thermistor voltage.

[0098] (2) TC / CC_SET, CC / Pluse_SET, FC / SC_SET, and END_SET are the reference potential points for trickle current to constant current, constant current to pulse, fast pulse to slow pulse, and end of charging, respectively.

[0099] (3) EN, TC_EN, CC_EN, CC / Pluse_EN, FC / SC_EN, END_EN, and VT_EN are respectively the charging enable, trickle charging enable, constant current charging enable, constant current to pulse charging enable, slow pulse charging enable, charging end enable, and normal temperature enable signals.

[0100] Specifically, Fig.13 As shown, the charging process of the control circuit of the present invention is as follows:

[0101] S100: Buck start

[0102] First, the buck circuit needs to establish the output voltage V normally. BK .

[0103] S200: Enable signal EN is valid

[0104] After the buck circuit works normally, the enable signal EN becomes valid and the subsequent charging circuit is started.

[0105] S300: Determine the charging battery voltage

[0106] Next, the system will determine the charging battery voltage V BAT Is it less than the minimum voltage V L .

[0107] S400: Trickle pre-charge

[0108] If V BAT <V L , then enter the trickle pre-charge stage until V BAT >V L .

[0109] S500: After trickle pre-charge, check V BAT Is it greater than the high voltage threshold V H .

[0110] If V BAT >V H , then stop charging.

[0111] If VBAT <V H , then determine whether to enter the constant current charging stage.

[0112] S600: constant current charging;

[0113] If V BAT Less than the middle voltage V M1 , entering the constant current charging stage.

[0114] If V BAT Greater than the intermediate voltage V M1 , then according to V BAT Switch between fast pulse charging or slow pulse charging.

[0115] S700: Fast pulse charging

[0116] If V M1 <V BAT <V M2 , entering the fast pulse charging stage.

[0117] S800: Slow pulse charging

[0118] If in the fast pulse charging stage, V BAT >V M2 , then switch to slow pulse charging.

[0119] S9000: Stop charging

[0120] During the charging process, V BAT , when V BAT Greater than V H , if yes, then stop charging and the battery is fully charged.

[0121] The entire charging process of the rechargeable battery of the present invention is that the output voltage V is normally established in the front-stage buck circuit. BK After that, the enable signal EN is valid, the subsequent charging circuit enters the working state, and determines the relationship between the charging battery voltage and multiple reference potentials, and performs switching control of the charging mode until the battery is fully charged.

[0122] Combined with the above Table 1, the charging process is as follows: When there is voltage input at the beginning, the buck circuit starts, the startup is completed and the normal output voltage V is established. BK Then start to judge the charging stage, first judge the charging battery voltage V BAT Is it lower than V L If yes, the rechargeable battery is trickle charged with a small current, otherwise it is charged to see if it is higher than the full charge voltage V H When the battery voltage V BAT Between V L With VH When the charging battery voltage V BAT Sequentially with V LM1 、V LM2 The comparison is completed, that is, the judgment and selection of the rechargeable battery in the constant current charging, fast pulse charging and slow pulse charging mode are completed, until the rechargeable battery voltage reaches the full charging level V H , stop charging.

[0123] Embodiment 3

[0124] join Fig.14 and Fig.15 The present invention further provides a new structure of an energy-saving flashlight based on the first and second embodiments. The rotating connection structure of the flashlight includes a barrel assembly A and a barrel head assembly B that are rotatably connected to each other. When the barrel head assembly B rotates to a certain position relative to the barrel assembly A, the flashlight is in a straight or L shape as a whole to meet different user needs.

[0125] It is understandable that the barrel assembly A includes a housing 1 and related parts arranged in the housing 1. The barrel assembly B is the lamp cap of the flashlight, and the barrel assembly B includes a lamp cap housing, a screw cap 2 connected to the lamp cap housing, a transparent glass 22 and related parts.

[0126] Specifically, a connecting shaft is provided on the end surface of the shell of the barrel body component A, and a connecting hole rotatably plugged with the connecting shaft is provided on the end surface of the barrel head component B; the connecting hole can be formed on the lamp barrel component B.

[0127] The connecting shaft is provided with a block that can be elastically reset, and at least part of the block is elastically exposed on the connecting shaft; the inner wall of the connecting hole is processed with a relatively concave card slot; when the connecting shaft is plugged into the connecting hole, the block and the card slot are mutually snap-connected to realize the rotational connection between the barrel assembly A and the barrel head assembly B. During assembly, the worker presses the card block by hand to retract it into the connecting shaft, and then inserts the connecting shaft into the connecting hole. When it reaches the specified position, the card block is elastically reset to be exposed on the connecting shaft and snapped into the card slot, realizing the rotational connection between the barrel assembly A and the barrel head assembly B.

[0128] The rotating connection structure does not require any tools when assembled and can be installed by hand, so the installation is convenient and quick; the card block is elastically inserted into the card slot to ensure that the connection between the barrel assembly A and the barrel head assembly B is stable and reliable, and will not fail due to long-term use. The performance is reliable and the service life is long.

[0129] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An energy-saving flashlight, comprising: Housing (1); A screw cap (2) threadedly connected to one end of the housing (1) A transparent glass (22) mounted on the screw cap (2); An end cover (11) fixedly connected to the other end of the housing (1); A sleeve (4) disposed in the housing (1); Two rechargeable batteries (41) mounted in the sleeve (4); An LED lamp (17) disposed in the rotary cover (2) via an anode pole (16); An energy storage mechanism provided at one end of the sleeve (4); The invention is characterized in that: the energy storage mechanism comprises a sealed cavity (49) fixedly connected to one end of the sleeve (4) near the end cover (11); energy storage liquid is provided in the sealed cavity (49); a connecting plate (46) is fixedly connected to the top of the sealed cavity (49); two rotating shafts (43) are rotatably connected between the sealed cavity (49) and the connecting plate (46) via bearings, and gears (44) are fixedly connected to the rotating shafts (43); a sliding assembly is provided on one side of the gears (44), and racks (45) are slidably connected to the sliding assembly, and the gears (44) are meshed with adjacent racks (45); the bottom of the racks (45) is fixedly connected to a power generation float (42) via a soft rope; a first rotating wheel (431) is fixedly connected to one end of the rotating shaft (43), and an input end of one of the rechargeable batteries (41) is rotatably connected to a second rotating wheel (433) via a rotating shaft, driving a belt (432) sleeved between the first rotating wheel (431) and the second rotating wheel (433); The sliding assembly comprises a side plate (47) and a sliding column (48); two side plates (47) are provided, both of which are fixedly connected to one side of the rack (45); the sliding column (48) is fixedly connected to the inner wall of the sealing cavity (49), and the side plates (47) are slidably connected to the sliding column (48); A fixing plate (14) is fixedly connected to one end of the sleeve (4), and the fixing plate (14) is fixedly connected to the inner wall of the shell (1); the anode pole (16) is fixedly connected to the fixing plate (14), and a reflector (15) is threadedly connected to the anode pole (16); a fixing sleeve (110) is fixedly connected to the outer wall of the other end of the sleeve (4), and the fixing sleeve (110) is fixedly connected to the inner wall of the shell (1); a cathode pole (13) is fixedly connected between the shell (1) and the sleeve (4); and a charging plug (12) is slidably connected to the end cover (11); The outer wall of the shell (1) is rotatably connected to a first bracket (5) via a pin; a first groove (52) is provided on a side wall of the first bracket (5) close to the shell (1), and a second bracket (51) is rotatably connected to the first groove (52) via a pin; second grooves (54) are provided on two side walls of the first bracket (5) away from the connection end; and a third bracket (53) is rotatably connected to the second grooves (54) via a pin; Two vertical plates (56) are fixedly connected to one end of the outer wall of the shell (1) close to the end cover (11); the vertical plates (56) are slidably connected to limit posts (57), and the two limit posts (57) are fixedly connected to the limit plates (55); springs (58) are sleeved on the outer sides of the limit posts (57); the two ends of the spring (58) are respectively fixedly connected to the vertical plates (56) and the limit plates (55); the first bracket (5) cooperates with the limit plates (55); The housing (1) is provided with a slide groove (32), the slide groove (32) extending to the end cover (11); a slider (33) is slidably connected in the slide groove (32), and a solar panel (31) is fixedly connected to the outer wall of the slider (33); a magnet is fixedly connected to the inner wall of the solar panel (31), and the solar panel (31) is electrically connected to the rechargeable battery (41); The energy-saving flashlight further comprises a control circuit, wherein the control circuit is used to connect the rechargeable battery (41), the solar panel (31) and the energy storage mechanism respectively, and the control circuit comprises: A buck circuit, wherein the buck circuit is connected to the energy storage mechanism; A hybrid mode charging circuit, wherein the hybrid mode charging circuit is connected to the buck circuit, and the hybrid mode charging circuit is connected to a rechargeable battery; The hybrid mode charging circuit combines the pulse charging mode with the constant current and constant voltage charging mode. The charging process of the control circuit is as follows: S100: Buck start; The buck circuit needs to establish the output voltage V normally. BK ; S200: Enable signal EN is valid; After the Buck circuit works normally, the enable signal EN becomes valid and the subsequent charging circuit is started; S300: Determine the voltage of the rechargeable battery; Determine the voltage V of the rechargeable battery BAT Is it less than the minimum voltage V L ; S400: trickle pre-charge; If V BAT <V L , then enter the trickle pre-charge stage until V BAT >V L ; S500: After trickle pre-charge, check V BAT Is it greater than the high voltage threshold V H ; If V BAT >V H , then stop charging; If V BAT <V H , then determine whether to enter the constant current charging stage; S600: constant current charging; If V BAT Less than the middle voltage V M1 , enter the constant current charging stage; If V BAT Greater than the intermediate voltage V M1 , then according to V BAT Switch between fast pulse charging or slow pulse charging; S700: fast pulse charging; If V M1 <V BAT <V M2 , enter the fast pulse charging stage, V M2 It is the reference voltage when the state is switched; S800: slow pulse charging; If in the fast pulse charging stage, V BAT >V M2 , then switch to slow pulse charging; S9000: Stop charging; During the charging process, V BAT , when V BAT Greater than V H , if yes, then stop charging and the battery is fully charged.

2. An energy-saving flashlight according to claim 1, characterized in that: A sealing ring (23) is fixedly connected to the inner wall of the rotary cover (2), and the sealing ring (23) is used for waterproofing.

3. An energy-saving flashlight according to claim 1, characterized in that: A switch button (18) is installed on the outer side wall of the housing (1), and the switch button (18) is electrically connected to the rechargeable battery (41); a display screen (19) is provided on one side of the switch button (18), and the display screen (19) is used to display the power level.

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