1. Field of the Invention
The present invention relates to a reel type power bank, in particular to the power bank having a built-in reel and a charging cable hidden in the reel and users can pull out the hidden micro USB charging cable from the reel to charge an electronic product.
2. Description of the Related Art
In various different types of portable electronic products such as mobile phones, MP3 players, personal digital assistants (PDA), notebook computers, electronic dictionaries, and digital cameras, battery is one of the necessary equipments. However, the aforementioned electronic products will become useless if the power of the battery is exhausted and a charging power supply is unavailable, particularly when a user carries the electronic products out, thus causing tremendous inconvenience to the user.
Therefore, a portable power bank has been introduced to the market, and such small-size power bank is stored with backup power, so that users do not have to worry about running out of battery in anywhere. Obviously, the power bank is convenient.
However, the conventional power bank charges an electronic product mainly in the following two methods: One method is to use a USB charging cable to connect the electronic product for charging, but this method cannot be used if users forget to carry the charging cable with them, and this method has a storage issue even if the users remember to carry the cable with them. The other method is to provide a small section of the USB charging cable 51 connected to the power bank 50 as shown in
In view of the aforementioned problems, the inventor of the present invention conducted researches and experiments and developed a reel type power bank to overcome the problems of the prior art.
It is a primary objective of the present invention to overcome the aforementioned problem of the prior art by providing a reel type power bank in accordance with the present invention.
To achieve the aforementioned objective, the present invention provides a reel type power bank with a built-in reel of a charging cable, such that the charging cable can be pulled out directly from the reel and connected to an electronic product for charging the electronic product without requiring users to carry an additional charging cable, so as to overcome the problem of charging inconveniently by the conventional power bank, and achieve the effect of providing a convenient carry and a user-friendly use.
Another objective of the present invention is to provide a reel type power bank connected to a DC-to-DC power conversion circuit for regulating the discharge voltage of the rechargeable battery to 5V, and the invention can satisfy the requirement of a compact power bank to provide a convenient carry.
To achieve the aforementioned objective, the present invention provides a reel type power bank, comprising: a housing, being a determined shaped body, and having an accommodating space therein; at least one rechargeable battery, installed on a side of the accommodating space; a control circuit board, installed in the housing and at an end corner opposite to the other side of the rechargeable battery, and having an inner side electrically coupled to the rechargeable battery, and further comprising: a charging input interface, coupled to the control circuit board, for inputting a charging power; a switch, coupled to the charging input interface, and electrically coupled to the rechargeable battery; a micro control unit (MCU), coupled to the switch; a constant voltage/constant current circuit, coupled to the MCU; a direct current to direct current (DC-to-DC) power conversion circuit, coupled to the constant voltage/constant current circuit and the switch; a universal serial bus (USB) output interface, coupled to the DC-to-DC power conversion circuit, and having a portion exposed from a surface of the housing, for outputting electric power; and a reel, built in the housing, and installed on a side of the control circuit board, and including a storage case, a winder disposed in the storage case, and a charging cable wound around the winder, and an outer end of the charging cable being extended from a notch formed at the periphery of the storage case and coupled to a USB plug, and an inner end of the charging cable being extended from the winder and out of the storage case, and electrically coupled to the DC-to-DC power conversion circuit, and the winder being rotatable clockwise or counterclockwise in the storage case, such that the charging cable can be pulled out for use or wound and hidden into the housing of the power bank.
Wherein, the MCU of the control circuit board is further coupled to an electricity capacity display interface, and the electricity capacity display interface is comprised of a plurality of light emitting diodes (LEDs), and a portion of the electricity capacity display interface is exposed from a surface of the housing.
In a preferred embodiment, the housing includes a groove formed on a side of the reel for accommodating the USB plug when the charging cable is wound.
With the aforementioned technical characteristics, the power bank of the present invention can regulate the discharge voltage of the rechargeable battery to 5V and satisfy the requirement of a compact power bank. In addition, the built-in reel of a charging cable can store a Micro USB charging cable of over 30 cm, so that users can pull out the charging cable from the reel directly and connected to an electronic product for charging the electronic product without the need of carrying the charging cable. Therefore, the invention can overcome the problems of charging inconveniently by the conventional power bank, and achieve the effect of providing a convenient carry and a user friendly use.
The present invention will become clearer in light of the following detailed description of an illustrative embodiment of this invention described in connection with the drawings. It is intended that the embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.
With reference to
With reference to
In
A switch 32 is coupled to the charging input interface 31 and electrically coupled to the rechargeable battery 20 for controlling a charge/discharge of the rechargeable battery 20.
A MCU 33 is coupled to the switch 32; a constant voltage/constant current circuit 34 is coupled to the MCU 33; a DC-to-DC power conversion circuit 35 is coupled to the constant voltage/constant current circuit 34 and the switch 32; a USB output interface 36 is coupled to the DC-to-DC power conversion circuit 35 and has a portion exposed from a surface of the housing 10 for outputting power.
In
Wherein, the DC-to-DC power conversion circuit 35 is provided for regulating an output voltage of the rechargeable battery 20, and the DC-to-DC power conversion circuit 35 of this preferred embodiment regulates the output voltage of the rechargeable battery 20 to 5V to supply the basic required DC voltage to the power bank. However, the output voltage of the rechargeable battery 20 of the invention is not limited to 5VDC voltage only.
In
Since the principle of winding the cable by the winder 42 is used which is a prior art and has been used in a reel of a mouse already, therefore the internal structure will not be described in detail. The present invention primarily applies the winding function of the winder and builds the reel 40 on a side of the control circuit board 30 within the limited space of the housing 10, and further extends the cable 46 from the winder 42 and out of the storage case 41, and the cable 46 is electrically coupled to the DC-to-DC power conversion circuit 35, so that the USB plug 44 at an outer end of the charging cable 43 can output power to charge an electronic product.
In addition, the storage case 41 is fixed in the housing 10, and the winder 42 can be rotated clockwise or counterclockwise in the storage case 41, such that the charging cable 43 can be pulled out for use or wound into the housing 10 of the power bank for storage. In a preferred embodiment, a latch (not shown in the figure) is disposed at the periphery of the winder 42, so that when the charging cable 43 is pulled or rewound, the latch will be latched automatically, and the charging cable 43 can be loosened by pulling the latch again, or the charging cable 43 can be rewound by pressing the latch again. However, the aforementioned winding/rewinding assembly and function are prior arts, and thus the latch inside the reel 40 will not be described in detail.
In this preferred embodiment, the reel 40 has an external diameter of approximately 4 cm. Since the Micro USB charging cable 43 is in a small and thin shape, therefore at least 30 cm of the Micro USB charging cable 43 can be wound. With reference to
In
In summation of the description above, the present invention has the following advantages:
1. The power bank of the present invention has the reel 40 built in the charging cable 43 and capable of storing a Micro USB charging cable 43 over 30 cm. The cable 43 can be pulled out directly for charging an electronic product without the need of carrying an additional charging cable. Therefore, the invention can overcome the problem of charging inconveniently by the conventional power bank, and achieve the effect of providing a convenient carry and a user-friendly use.
2. The power bank of the present invention is combined with the DC-to-DC power conversion circuit 35 to regulate the discharge voltage of the rechargeable battery 20 to 5V and satisfy the requirement of a compact power bank to provide users a convenient carry.