Patent Publication Number: US-2016223175-A1

Title: Portable high power ac lighting

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a portable high power AC lighting, particularly to one that is easy for holding and carrying and that has a 360° lighting angle with high-brightness. 
     2. Description of the Related Art 
       FIG. 1  is a perspective view of a conventional flashlight  100 , comprising a body  101 , a front head  102  arranged at the front of the body  101 , and a small bulb  103  disposed inside the font head  102 . It has batteries (not shown) disposed inside the body  101  to supply DC power for the small bulb  103 . It is common among households due to its feature as easy carrying. However, the flash light  100  can only output low power electricity with neither a small bulb  103  nor a LED bulb, and the lighting angle θ is restricted as well. Thus, when it comes to occasions requiring high-brightness such as emergency rescue, traffic warning, and some working places, it is still inadequate. 
       FIG. 2  is a perspective view of a conventional working light  200 , comprising an AC bulb  201 , a protecting wire net  202 , a hook  203 , an extended line  205  and an AC plug  206 . It has the hook  203  to be hung up on an object  204  to provide lighting in working places. Such working lights have AC power to provide the AC bulb and consequently are able to output high power electricity that would satisfy the needs in working places like repair shops and garages. However, the AC power has to be acquired by connecting the extended line  205  and the AC plug  206  with main supply, and the extended line  205  may cause obstacles and inconveniences in the working process; more importantly, it places a restriction of environment. Therefore, such structure is still inadequate as well. 
     SUMMARY OF THE INVENTION 
     It is a primary object of the present invention to provide a portable high power AC lighting that has the DC energy in the series lithium battery pack inside the body thereof converted into AC energy for output, so as to form a lighting device of high-brightness with a 360° lighting angle that can solve the problems in the prior art and meanwhile has a portable feature and an AC bulb providing brighter luminance. 
     In order to achieve the objects, the present invention comprises a body arranged in a shape for holding with an installing space therein and an opening at the top thereof; a series lithium battery pack including a plurality of lithium batteries and disposed inside the installing space; at least one controlling circuit board disposed inside the installing space and electrically connected to the series lithium battery pack with a DC charging unit and an AC supply unit disposed thereon; a DC power input interface coupled to the controlling circuit board and arranged on the surface of the body uncovered; a bulb holder disposed inside the opening of the body and electrically connected to the controlling circuit board; an AC bulb, including a cap and a luminous body where the cap being mounted on the bulb holder, placing the luminous body above the opening and the AC bulb above the body; a light cover fixed above the opening in order to cover the AC bulb; said DC charging unit including a charging control loop with the input thereof coupled to the DC power input interface and a MCU coupled to said charging control loop with the positive and negative electrode separately coupled to the charging control loop and the MCU; and said AC supply unit including an output control loop with the input thereof coupled to the charging control loop and the positive electrode of the series lithium battery pack and coupled to the MCU as well for the output control loop to control the output of the direct currents, and a DC-AC converter with the input thereof coupled to the output control loop to convert direct currents to alternating currents and further provide the electricity for the AC bulb from the output terminal thereof; whereby the series lithium battery pack can restore DC energy and provide the electricity for the AC bulb via the AC supply unit, so as to form a portable high power AC lighting with a 360° lighting angle. 
     Furthermore, both electrodes of the series lithium battery pack are further coupled to a battery protection circuit and the negative electrode thereof is coupled to a current detector. The charging control loop of the DC charging unit is coupled to a constant voltage loop and a voltage regulator circuit, and the MCU is further coupled to a light signal display unit, a temperature controller and a switch button disposed on a corresponding first hollow hole arranged on the body and having a cover piece on the surface thereof. 
     In addition, the AC bulb is made of a compact fluorescent light bulb, a LED bulb, a PL energy saving light bulb, or a LED/PL fluorescent tube. The body of the present invention is assembled by two symmetrical housings with a groove along the joint surface for a water-proof rubber band to be disposed therein, making it water-proof; and a second hollow hole is arranged on the body in the corresponding position with the DC power input interface for it to be disposed therein, and the surface of the second hollow hole further includes a detachable water-proof pad. The light signal display unit thereof is further constructed by a plurality of arranged LED and light guiding tubes, and the body has a plurality of hollow holes corresponding to the position of the light signal display unit to emit the lights therefrom. 
     With the structures disclosed above, the present invention has the series lithium battery pack for recharge and saving the direct currents rapidly and repeatedly in order to provide the AC power for the AC bulb by an AC supply unit, forming a lighting device of high-brightness with a 360° lighting angle that can be held and carried easily like a bright torch. Additionally, the present invention uses a standard AC LED/PL bulb which is common in households, making it much easier to replace the bulb when needed. Hence, the present invention has the problems in the prior art solved and provides a high power but energy saving lighting device for continuous usage. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a conventional flashlight; 
         FIG. 2  is a perspective view of a conventional working light; 
         FIG. 3  is an exploded view of the present invention in an applicable embodiment; 
         FIG. 4  is an exploded view of the body and the bulb thereof in an applicable embodiment; 
         FIG. 5  is a perspective view of the present invention in an applicable embodiment; 
         FIG. 6  is a sectional view of the present invention in an applicable embodiment; and 
         FIG. 7  is a circuit block diagram of the present invention in an applicable embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     First of all, some certain words in this description and the subsequent claims referring to specific components shall be understandable for a skilled person in the art. In the following description and subsequent claims, the components are not distinguished by terms different from what other manufacturers may use but by functions, and the term ‘include’ and ‘comprise’ in the description and subsequent claims are referred to an open term that should be interpreted as ‘including, but not limited to.’ Besides, the term ‘couple’ includes both direct and indirect means of electrical connection. 
     Referring to  FIGS. 3-7 , in an applicable embodiment, the present invention comprises a body  10 , a series lithium battery pack  50 , at least one control circuit board  40 A, a bulb holder  60 , an AC bulb  80  and a light cover  20 . 
     The body  10  is arranged in a shape for holding with an installing space  11  arranged therein and an opening  12  at the top thereof; and the opening  12  has an electrode  13  arranged at the bottom. In this embodiment, the body  10  is assembled by two symmetrical housings  10   a ,  10   b  with a groove  14  along the joint surface for a water-proof rubber band  22  to be disposed therein, making the present invention water-proof. Moreover, the inner edge of the opening  12  has a first thread  15 , and the body  10  has a tab  16  arranged aside, and a magnet  53  and a D ring  54  are arranged at the bottom thereof for attaching and hanging. 
     The series lithium battery pack  50  includes a plurality of lithium batteries and disposed inside the installing space  11 . In this embodiment, the positive and negative electrodes thereof are further coupled to a battery protection circuit  51  and the negative electrode thereof is coupled to a current detector  52 . The battery protection circuit  51  can protect the series lithium battery pack  50  from sudden electrical surge or unusual situation, and the current detector  52  can detect the charging status of the series lithium battery pack  50 . In the embodiment, there is one set of series lithium battery pack  50 , but it is not limited to such application. There could be more than one pack so that one of which can be disposed inside the installing space  11  for usage and the others can be full charged and available for carrying in case of the need; simply arranging a detachable cover on the body  10  in the corresponding position would allow the replacement of the series lithium battery pack  50 . 
     The controlling circuit board  40 A is disposed inside the installing space  11  and electrically connected to the series lithium battery pack  50 . In the embodiment, there are a DC power input interface  30 , a DC charging unit  40  and an AC supply unit  70  disposed on the controlling circuit board  40 A. The DC power input interface  30  is coupled to the controlling circuit board  40 A and is arranged on the surface of the body  10  uncovered. In this embodiment, a second hollow hole  18  is arranged on the body  10  in the corresponding position with the DC power input interface  30  for it to be disposed therein, and the surface of the second hollow hole  18  further includes a detachable water-proof pad  181  which is usually wedged therein to ensure the present invention being water-proof; only when the present invention needs charging would it be removed. 
     The bulb holder  60  is disposed inside the opening  12  of the body  10  and is electrically connected to the controlling circuit board  40 A; in this embodiment, the bottom  62  of the bulb holder  60  is electrically connected to the electrode  13  of the bottom of the opening  12  in order to provide the AC power to the bulb holder  60  via the electrical contact  61 . 
     The AC bulb  80  includes a cap  81  and a luminous body  82 . The cap  81  is mounted on the electrical contact  61  of the bulb holder  60 , placing the luminous body  82  above the opening  12  and the AC bulb  80  above the body  10 . In the embodiment, the AC bulb  80  is made of a compact fluorescent lighting bulb and the cap  81  and the electrical contact  61  would be designed as a complementary spiral for screwing, but it is not limited to such application. It can also be a LED bulb, a PL energy saving light bulb, or a LED/PL fluorescent tube, and the cap  81  and the electrical contact  61  would also be designed as a complementary structure as well. 
     The light cover  20  is fixed above the opening  12  in order to cover the AC bulb  80 , and it could be made of light-transmitting PC materials. In the embodiment, the bottom edge of the light cover  20  has a second thread  21  to be screwed with the first thread  15  for the light cover  20  to be fixed above the opening  12  quickly and to cover the AC bulb  80 ; it is also convenient for replacing the AC bulb  80 . In this way, the body  10  and the light cover  20  are both sealed and water-proof. 
     The DC charging unit  40  is disposed on the control circuit board  40 A and includes a charging control loop  41  with the input thereof coupled to the DC power input interface  30 , and a MCU  42  coupled to said charging control loop  41  with the positive and negative electrode of the series lithium battery pack  50  separately coupled to the charging control loop  41  and the MCU  42 . In this embodiment, the charging control loop  41  of the DC charging unit  40  is further coupled to a constant voltage loop  44  and a voltage regulator circuit  43 , and the MCU  42  is further coupled to a light signal display unit  45 , a temperature controller  46  and a switch button  47  disposed on a corresponding first hollow hole  17  arranged on the body  10  and having a cover piece  171  on the surface thereof. Furthermore, the light signal display unit  45  is further constructed by a plurality of arranged LED  451  and light guiding tubes  452 , and the body  10  has a plurality of hollow holes  19  corresponding to the position of the light signal display unit  45  to emit the lights therefrom. 
     The AC supply unit  70  is disposed on the control circuit board  40 A and includes an output control loop  71  and a DC-AC converter  72 . The output control loop  71  has the input thereof coupled to the charging control loop  41  and the positive electrode of the series lithium battery pack  50 ; it is also coupled to the MCU  42  as well for the output control loop  71  to control the output of the direct currents; and the DC-AC converter  72  has the input thereof coupled to the output control loop  71  to convert direct currents from the DC charging unit  40  to alternating currents and further provide the electricity for the AC bulb  80  from the output terminal thereof. In the embodiment, the AC supply unit  70  further includes an output voltages control circuit  73  coupled in-between the output control loop  71  and the DC-AC converter  72  for controlling the output voltages, and an overload protection loop  74  coupled to the DC-AC converter  72  and the AC bulb  80 ; 
     whereby the series lithium battery pack  50  can restore DC energy and provide the electricity for the AC bulb  80  via the AC supply unit  70 , so as to form a portable high power AC lighting  90  with a 360° lighting angle that solves the problems in the prior art and meanwhile has a portable feature with brighter luminance as a flashlight. 
     Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.