FR2783108A1 - Mobile telephone battery with AC/DC recharging, especially through line supply - Google Patents

Abstract

The mobile telephone battery can be charged directly over a line supply, and includes a casing, put together from a front plate (20) and a back casing body (21). A hollow reception (22) is arranged on the front side of the front plate to hold a plug (30). A charger is installed in a casing; and includes an AC input plug (60), a rectification, filtering, and stabilization arrangement, a transformer (1), and a charging circuit (65) with a transistor control circuit (64) for charging the mobile telephone battery with a DC current.

Description

RECHARGEABLE MOBILE PHONE BATTERY

ALTERNATIVE CURRENT / DIRECT CURRENT

  The present invention relates to "an alternating current / direct current rechargeable mobile phone battery", especially to a mobile phone battery which can be charged directly from the mains or charged using a direct current charger ordinary

available on the market.

  To charge a conventional mobile phone battery, in order to replenish the energy consumed, a charger must be used. For this reason, the user must additionally purchase a charger and pay the price. Besides that, the charger is too large and too heavy and it is cumbersome to transport.

  Because of these drawbacks, manufacturers have improved it.

  As shown in Figure 1, the rechargeable battery consists of a housing (10) and a charger, etc. A concave box (13) with two notches on its left and right sides is placed on a panel (12) of the box (10) to contain a plug (15) swiveling outwards and positionable. The plug (15) comprises two pieces (16) of electrical connection extending forward and a pin (17) conductive support connecting, crosswise, the pieces (16) of electrical connection. Left and right conductive plates (18) with notches are installed on the circuit board (11) of the charger to grip the conductive support axis (17) of the plug (15). Then, the mains current (alternating current) can be delivered to the charger via the electrical connection parts (16), the conductive support pin (17) and the conductive plates (18) of the plug (15). . However, this design of the conductive support axis (17) increases the electrical resistance; moreover, the contact between the conductive support axis (17) and the conductive plates (18) of the circuit board (11) is in the form of a quick coupling, which cannot be a firm contact. Next to that, when we pivot outwards and position the plug (15), as well as when we retract and store it, the conductive support axis (17) does not separate from the conductive plate (18), it is still subject to abrasion and this results in a drop in conductivity. In addition, since the positioning of the conductive support axis (17) of the plug (15) is based on the firm assembly of the circuit board (11) and the support of the conductive plate (18), it occurs always play. This is not an ideal structure for operation. There is also another drawback. The plug (15) constitutes the AC input terminals of the charger. After rectification, filtering and stabilization, the alternating current is converted into a direct current to drive the transformer and the load circuit via a drive circuit composed of transistors. On the one hand, direct current is used to charge rechargeable batteries (19), on the other hand, it supplies energy to the mobile phone via the DC output terminals of the panel (12). When the accumulators (19) are fully charged, the charger cannot automatically cut the driven circuit. This will result in a waste of energy and a shortening of the life of the circuit and of the accumulators (19). Another problem is that there is no full charge indicator and no protection of the accumulators (19) against overheating. Due to the disadvantages of the rechargeable mobile phone battery, the inventor sought a new way to solve these problems and finally came up with the invention of a "battery for

  mobile phone rechargeable by alternating current / direct current ".

  The object of the present invention to provide a "battery for mobile phone rechargeable by alternating current / direct current". The plastic axis of the plug is held between the concave cabinet of the panel and the rear housing body, causing the electrical connection parts of the plug to bear strongly on elastic conductive parts of the charger circuit board. When the plug is retracted and stored, the electrical connection parts will be disconnected from the elastic conductive parts. The plug can be assembled quickly and securely as a whole, it has a

  extended service life and improved conduction quality.

  Another object of the present invention is to provide a "battery for mobile phone rechargeable by alternating current / direct current", in which an outwardly pivoting and positionable plug is placed on the back of the housing body, making the battery rechargeable can be charged directly by the sector without the

detach from the mobile phone.

  The third object of the present invention is to provide a "battery for mobile phone rechargeable by alternating current / direct current", in which a two-color LED (light-emitting diode), a heat-sensitive resistor and the rechargeable accumulators are connected in parallel to the charging circuit. When the charging voltage is lower than the reference voltage, the red light of the two-color LED lights up. When the batteries are fully charged, the green light of the two-color LED lights up and a low potential comes out to an optically coupled switch from an analog integrated circuit to stop the charge. Therefore, we

  saves energy and prolongs battery life.

  The characteristics and advantages of the invention will emerge

  moreover from the description which will follow by way of example with reference to

  in the accompanying drawings, in which: Figure 1 is an exploded view of a rechargeable prior art battery for a mobile phone; Figure 2 is a view of the aspect of the invention; Figure 3 is an exploded view of Figure 2; Figure 4 is a perspective view showing the plug (of Figure 2) which has been pivoted outward and positioned; Figure 5 is a sectional view showing the plug (of Figure 4) which has been pivoted outward and positioned; Figure 6 is a side view of Figure 5; Figure 7 is a view showing the plug of Figure 6 which has been retracted and stored; Figure 8 is a block diagram of the charger of the present invention; Figure 9 is a circuit diagram of Figure 8; and Figure 10 shows the appearance of another practical example of the

present invention.

  As shown in Figure 2, the "AC / DC rechargeable mobile phone battery" is primarily a rechargeable mobile phone battery that can be charged directly from the mains (typically AC 110-240 V). A charger is fixed in a box, and a space forming a concave box (22) is formed on the front of the panel (20) of the box to contain the plug (30) (which can be pivoted outwards and similarly positioned that retracted and stored) which is used for direct charging

by the sector.

  As shown in Figure 3, the rechargeable battery case is composed of the panel (20) and a rear body (21) of the case by connecting them by high frequency welding. A concave box space (22) is provided on the front of the panel (20), notches (25) are made respectively at the rear ends of the left and right side walls (23, 24) of the concave box (22) to receive the left and right sections (32, 33) of the plastic support pin of the plastic body (31) of the plug (30). The left and right parts (34, 35) for the electrical connection of the plug pass through the plastic body (31) (being longer towards the front and shorter towards the rear). A pair of plates (26, 27) forming a plastic support is placed on the internal side of the rear housing body opposite one another, one being on the left, the other on the right. The plastic support plates grasp the support axis (32, 33) of the plug using their notches (28) located at the front end of the plates to allow the plug (30) to pivot, around from the axis, outwards and to position or to

retract and put away.

  The charger circuit board (50) and the rechargeable accumulators (67) are permanently installed in the case of the rechargeable battery. Two elastic conductive parts (51, 52), extending out of the circuit board (50), are used as the AC input terminals. The rear ends of the parts (34, 35) for the electrical connection of the plug (30) are pressed elastically against the parts (51, 52). Figures 4, 5, and 6 show the plug (30) in the pivoted outward position and positioned. The plastic body (31) of the plug (30) has a shape adapted to that of the left and right walls (23, 24) of the concave box (22). The plastic support pin (32, 33) is gripped and held by a plate (26, 27) forming a support and its notches (25, 28) of the same material. This process can reduce the electrical resistance, improve the quality of current conduction, which results in that the alternating current can pass regularly in the charger through the parts (34, 35) of electrical connection of the plug (30). and the elastic conductive parts (51, 52). In addition, the plug has a large

  service life and can be assembled quickly and securely.

  As shown in Figure 7, when the rechargeable batteries do not need to be charged, we can retract and store the plug (30) in the concave box space (22) of the panel (20), then the rear ends of the parts (34, 35) for the electrical connection of the plug (30) are detached from the elastic conductive parts (51, 52) of the

circuit board (50).

  As shown in Figure 8, an alternating current of 110 to 240 V enters via the AC input terminal (60) of the rechargeable battery, and then passes through the rectifier circuit (61), the circuit (62 ) filtering, the voltage stabilization circuit (63), the drive circuit (64) and the charging circuit (65) for charging the rechargeable batteries (67). When using a charger available on the market, the charging current flows through the DC terminal (69) and the elastic charging part (42) (as shown in Figure 3) to enter the rechargeable batteries (67). When the rechargeable batteries are fully charged, the DC current can be passed to the mobile phone through its DC output terminal (68) and the conductive part (40).

as shown in Figure 3.

  1 5 Referring to FIG. 9, the alternating current of 110 to 240 V enters via the terminal (60) of the alternating current input of the charger, then is rectified in direct current by means of a rectifier (D1), mounted in bridge, of the rectifier circuit (61). The current limiting resistor (R1) is used to limit the current within a defined range; the resistor (R2) and the diode (D2) combined with the transistor (Q1) are used as a filter and, together with a Zener diode (D3) of the voltage stabilization circuit, give a comparison reference voltage for the section overcurrent protection

attack circuit.

  A switching circuit, which gives a suitable voltage for controlling the transistor (Q2) is composed of a transistor (Q1) and an optical coupler (El). Rechargeable batteries (67) are charged via the transformer (T) and the charging circuit (65). The load circuit (65) is connected to the output terminal of the secondary transformer winding. The following elements are connected in the charging circuit (65), in parallel: a two-color LED, a capacitor (E4) connected in series with a diode (D4), and the rechargeable batteries (67). Via a zener diode (D5) and a resistor (R7), an analog integrated circuit (E2) is connected to the connection point of the capacitor (C4) and the diode (D4) to give a reference voltage. Another end of the analog integrated circuit (E2) is connected to the switching point of the LED

  two-color to compare the charging voltage with the reference voltage.

  When the voltage is lower than the reference voltage (the potential of pin # 3 is lower than that of pin # 2), the drive circuit (64) is implemented, and the rechargeable batteries (67) are charged via the transformer (T) and the charging circuit (65). At the same time, the two-color LED (see the light window (29) in Figure 3) lights up red, indicating that charging is in progress. When the rechargeable batteries are fully charged (the potential of pin # 2 is lower than that of pin # 3), the diode (D4) is conductive and the two-color LED lights up in green. At the same time, a lower potential goes out to the optical switch integrated circuit (E1), coming from the analog integrated circuit (E2), to block the transistor (Q2) and stop the load. This results in saving energy and

  prolongs the life of the circuit and the accumulators.

  Before connecting the rechargeable accumulators (67) to the output terminals on the secondary side of the transformer (T), two heaters (R10, Rll) sensitive to heat are connected in series with a circuit (66) for protection against overheated. When the temperature inside the rechargeable batteries (67) rises, the resistance value of the heat-sensitive resistors R10, Rl1 decreases correspondingly, which provides protection against overheating.

  to stop charging the rechargeable batteries.

  As shown in Figure 10, the concave box (220) is placed on the back of the box (210) to contain the plug (30) allowing the rechargeable battery to be charged by mains current without detaching it from the

mobile phone.

  In summary, the "battery for mobile phone rechargeable by alternating current / direct current" has a long service life and can be assembled quickly and securely; its conductivity is higher than that of others; it is suitable for charging a mobile phone in the waiting state; it includes indicators intended to display the state of charge (in charge or fully charged); it can stop charging automatically, which means that the life of the circuits and rechargeable batteries is extended. She can in practice

meet all requirements.

Claims (4)

  1. Battery for mobile phone rechargeable by alternating current / direct current, in particular a kind of battery for mobile phone which can be charged directly on the current of the sector, characterized in that it comprises: a housing composed of a panel (20 ) and a rear housing body (21) including a concave box (22) which is placed on the front of the panel to contain a plug (30) which can pivot outwards and position; a charger installed in said housing (20, 21), the alternating current entering via its alternating current input plug and then being rectified, filtered and stabilized to attack a transformer (T) and a charging circuit ( 65), via a transistor drive circuit, for charging rechargeable batteries (67) with direct current and its direct current output terminal being connected to elastic conductive parts (51, 52) for delivering direct current to the mobile phone, said charger comprising a plastic support pin (32, 33) extended at its two ends, on the left and right sides of the plastic body of the housing plug, to be inserted into left notches and right of the concave box (22) on the panel (20), the extended ends also being gripped by the front notches of the left and right plates forming a support which are installed face to face in the b rear box, and left and right parts of electrical connection penetrating through the plastic body; two elastic conductive parts (51, 52), used as AC input terminals, extending out of the circuit board and pressing on the rear ends of the electrical connection parts of the plug pivoted outwards; an optically coupled switch (E1) connected to the base of the charger driver circuit transistor; a charging circuit (65) connected to the output terminal of the secondary transformer coil (T), the following elements being connected to said charging circuit: a two-color LED, a capacitor (C4) connected in series with a diode (D4 ), and rechargeable batteries; an analog integrated circuit being connected to the connection point of the capacitor (C4) and the diode (D4) via a Zener diode (D5) to provide a reference voltage; another end of the analog integrated circuit being connected to the switching point of the two-color LED to compare the charging voltage with the reference voltage; the two-color LED lighting up in red when the voltage is lower than the reference voltage, the diode (D4) driving and the two-color LED lighting up in green when the rechargeable batteries are fully charged; at the same time, a lower potential coming out of the optical switch of the circuit   integrated analog to block the transistor of the driving circuit.   2. Battery for mobile phone rechargeable by alternating current / direct current according to claim 1, in which the plug (30) on the housing can be retracted and can be stored in the concave box (22) of the panel and in which, at the same time , the electrical connection part of the plug disconnects from the elastic conductive part of the circuit board, its rear end moving upwards. 3. Battery for mobile phone rechargeable by alternating current / direct current according to claim 1, in which the concave box (22) is placed on the back of the case to contain the plug, thus making it possible to charge the mobile phone with the current of the sector without dismantling it.   An alternating current / direct current rechargeable mobile phone battery according to claim 1, wherein the rechargeable accumulators (67) are connected in series with a heat sensitive resistor before being connected to the winding. secondary of the charger.