JP3040642U - 2 power supply type battery charger - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a dual power supply type battery charger for dual use which can be connected to a DC power supply from an automobile cigarette lighter receptacle and an AC power supply from a residential power outlet unit. is there. A battery charger according to the present invention comprises: (a) a first set of input terminals for electrically connecting to a DC power supply of a first voltage; and (b) an AC power supply of a second voltage. A second set of input terminals for connecting, and (c) a set of output terminals for electrically connecting to a power input terminal of a rechargeable battery,
(d) electrically connected between a first set of input and output terminals of a battery charger for converting a first voltage direct current to a third voltage direct current suitable for charging a battery. And (e) an electrical connection between the second set of input terminals and the first set of input terminals of the battery charger for converting the second voltage alternating current into the first voltage direct current. And a second conversion circuit connected to.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates generally to battery chargers, and more particularly to dual power battery chargers.

[0002]

[Prior art]

 As battery-powered electrical and electronic products become more popular, many manufacturers are adopting rechargeable batteries in such devices to reduce the cost of battery replacement for end users. An increasing number of portable electronic devices for the masses include personal communication devices such as portable car phones. Virtually all mobile phones utilize rechargeable battery packs that users can recharge on a regular basis when needed.

Many manufacturers offer battery chargers designed to operate from a DC power source, such as a vehicle battery. Such DC operated chargers are equipped with a dedicated adapter designed to interface with the standard cigarette lighter receptacle used in automobiles. For this reason, the user must use a DC operated charger to charge the battery while on the move.

In order to charge a battery using an AC power supply at home or in the workplace, it is necessary to use an AC power supply battery charger. AC battery chargers typically include an adapter to interface with a standard power outlet unit built into the wall of a home or workplace. The AC battery charger also includes a conversion circuit for converting a standard 110 or 220 volt AC voltage to the 12 volt DC voltage required to charge the battery.

[0005] Because the battery charger for DC power supplies is designed to operate on DC power and only works in conjunction with a standard cigarette lighter receptacle, the user needs to use a DC power supply when charging a battery with an AC power supply. You cannot use a battery charger for the battery. Similarly, the battery charger for AC power supplies is designed to operate on AC and to work in conjunction with a standard wall power outlet unit so that users can charge from a DC power source such as a cigarette lighter receptacle. Sometimes the AC battery charger cannot be used.

Therefore, when the user wants to charge the battery from both the DC power supply and the AC power supply of the automobile, both the DC power supply battery charger and the AC power supply battery charger must be purchased. I was in profit. Furthermore, if users want to be able to charge from both AC and DC outside their home or workplace, they must move their AC battery charger from their home or workplace to that location. I was suffering from the inconvenience. Therefore, not only is it a waste of money to purchase and maintain two different charging devices, but the user must always keep track of where their AC power charging unit is. There wasn't.

[0007]

[Problems to be solved by the device]

 Therefore, there is a need for a battery charger that can physically work together with a cigarette lighter receptacle installed in an automobile and an AC power outlet unit installed in a house or a workplace. There is also a need for a battery charger that is electrically connected to both a DC power supply and an AC power supply to supply a direct current power suitable for charging a battery. Therefore, the present invention seeks to provide a battery charger that can meet these requirements.

[0008]

[Means for Solving the Problems]

 The present invention provides a dual power source battery charger for charging a rechargeable battery having a power input terminal. The battery charger comprises (a) a first set of input terminals for electrically connecting to a DC power supply of a first voltage, and (b) a second set of terminals for electrically connecting to an AC power supply of a second voltage. Suitable for charging a battery with a pair of input terminals, (c) a pair of output terminals for electrically connecting to a power input terminal of a rechargeable battery, and (d) direct current of a first voltage The first conversion circuit electrically connected between the input terminal and the output terminal of the first set of the battery charger for converting into the DC of the third voltage, and (e) the crossing of the second voltage. It is composed of a second conversion circuit electrically connected between the second set of input terminals of the battery charger and the first set of input terminals for converting the first voltage into direct current.

The battery charger further comprises an AC adapter for connecting and operating the battery charger to an AC power outlet, the AC adapter electrically connected to the second set of input terminals. Preferably, the AC adapter comprises a pair of prongs for interlocking operation with a residential wall power outlet unit.

The battery charger further comprises a DC adapter for connecting and operating the battery charger to a DC power outlet, the DC adapter electrically connected to the first set of input terminals. The DC adapter is preferably operable to connect to the cigarette lighter receptacle of the vehicle. The battery charger further comprises a shell for housing the first and second sets of input terminals, output terminals, and the first and second conversion circuits. The AC and DC adapters can be mounted on the outer surface of the housing.

In another embodiment, the battery charger of the present invention comprises: (a) a first set of input terminals for electrically connecting to an AC power supply of a first voltage; and (b) a second voltage of A second set of input terminals for electrically connecting to a DC power source; (c) a set of output terminals for electrically connecting to a power input terminal of a rechargeable battery; A first electrically connected between a first set of input terminals and an output terminal of a battery charger for converting a one voltage alternating current into a third voltage direct current suitable for charging a battery. A conversion circuit, and (e) an electrical connection between the input and output terminals of the second set of the battery charger for converting the direct current of the second voltage into the direct current of the third voltage suitable for charging the battery. And a second conversion circuit that is electrically connected.

These and other features, forms and advantages of the invention will be more clearly understood with reference to the following description, claims and accompanying drawings.

[0013]

[Embodiment of the invention]

 Referring to FIG. 1, there is shown a dual power battery charger 10 for charging a rechargeable battery having a power input terminal according to an embodiment of the present invention. The battery charger 10 includes (a) a first set of input terminals 12 for electrically connecting to a DC power supply of a first voltage, and (b) for electrically connecting to an AC power supply of a second voltage. A second set of input terminals 14, (c) a set of output terminals 16 for electrically connecting to a power input terminal of a rechargeable battery, and (d) charging the battery with a direct current of a first voltage. A first conversion circuit 18 electrically connected between the input terminal 12 and the output terminal 16 of the first set of the battery charger 10 for converting into a direct current of a third voltage suitable for ) A first electrically connected between the second set of input terminals 14 and the first set of input terminals 12 of the battery charger 10 for converting the second voltage alternating current into the first voltage direct current. 2 conversion circuit 20. Therefore, the first conversion circuit 18 and the second conversion circuit 20 are electrically connected in series.

2-4, the battery charger 10 preferably further comprises a shell 22 for housing the components of the battery charger 10 described above. The battery charger 10 further includes an AC adapter 24 for connecting and operating the battery charger 10 to the AC power outlet, where the AC adapter 24 is electrically connected to the second set of input terminals 14. . Preferably, the AC adapter 24 comprises two pins 26 for interlocking operation with a residential power outlet unit. For example, the American Electric Manufacturers Association (NEMA) 5-15p plug standard, 125VAC, 10A, can be used.

The battery charger 10 further comprises a DC adapter 28 for connecting and operating the battery charger 10 to a DC power outlet, where the DC adapter 28 electrically connects to the first set of input terminals 12. Connected. Preferably, the DC adapter 28 comprises a device for interlocking with a cigarette lighter receptacle of a vehicle. For example, a cigarette lighter adapter (12-15VDC, 15A) can be used. As shown in FIG. 2, the AC adapter 24 and the DC adapter 28 are attached to the outer surface of the shell 22 and are electrically connected through the shell 22 to the first conversion circuit 18 and the second conversion circuit 20, respectively.

Thus, the battery charger 10 of the present invention can be plugged into a cigarette lighter housing of a vehicle to charge the battery on the move, and the wall power to charge the battery using alternating current. It has the advantage that it can also be plugged into an outlet unit.

The AC adapter 24 is composed of two pins 26 slidably arranged on the shell 22. To insert the battery charger 10 into the wall power outlet unit, the pin 26 is slid out of the shell 22 and exposed. This sliding pin is easily feasible for many manufacturers.

Referring to FIGS. 5-7, a battery charger 10 according to another embodiment of the present invention is shown. In this embodiment, the AC adapter 24 is composed of a pair of pins 26 rotatably attached to the shell 22. This rotating pin is easily feasible for many manufacturers. To insert the battery charger 10 into the wall power outlet unit, rotate the pin 26 away from the shell 22 to expose it. In all other respects, the battery charger 10 of the embodiment shown in FIGS. 5-7 is similar to the battery charger 10 of the embodiment shown in FIGS.

Referring to FIG. 8, a first voltage DC in the range of between about 12 volts and about 25 volts is converted to a third voltage DC of about 12 volts to charge the battery. A circuit example of the 1 conversion circuit 18 is shown. The first conversion circuit is composed of a pair of input terminals 30 for connecting to a DC power supply and a pair of output terminals 32 for supplying DC to charge a battery. The first conversion circuit further includes resistors R1, R2 (3.6K) and Rsc (0.33), a capacitor Co (470μF polar (POLARIZED) electrolytic capacitor (LYTIC)), C5 (100μF 25V polar electrolytic capacitor) and C _T2 (470 pF film capacitor (FILM)), coil (transformer) L3 (220 μH), Zener diode D5 (1N5819), and IC U2 (MC34063 manufactured by Motorola). These circuit components are electrically connected as shown in FIG.

The IC U2 is a monolithic control circuit having a function necessary for the DC-DC converter. IC U2 includes an internal temperature compensated reference, a comparator, a duty cycle controlled oscillator with active current limiter circuit, a driver and a high current output switch. The oscillator of IC U2 consists of a current source and reservoir that charges and discharges an external timing capacitor C _T2 between preset upper and lower thresholds. Typical charge and discharge currents are 35 μA and 200 μA, respectively, in a ratio of about 1 to 6. Thus, in a charge-discharge cycle, the ramp-up time is 6 times longer than the ramp-down time. The upper threshold is equal to the internal reference voltage of 1.25 volts and the lower threshold is equal to about 0.75 volts. The oscillator operates continuously at a rate controlled by the selected value of capacitor C _T2 .

The first conversion circuit 18 uses a step-dpwn converter. The coil (ind uctor) L3 switches the input voltage to both ends (across) via an internal switch of the IC U2. When the switch is off, coil L3 discharges to the output capacitor Co. A regulated DC output voltage is obtained across the output capacitor C o and is controlled by varying the on-time of the switch. The capacitor C _T2 is used to set the on time of the switch. Capacitor C5 is an input filter capacitor and is rated at about 35V DC. The resistors R1 and R2 are used to set the output voltage value. The resistor Rsc is used to set the maximum output current value.

The internal switch of IC U2 disconnects the input voltage (Vin) and provides a variable duty cycle square wave to a simple LC filter formed by coil L3 and capacitor Co. This filter smoothes the square wave and controls the percent conduction time (% Ton) over the total switching cycle time of the switch (ie, On time (Ton) + Off time (Toff)). This creates a DC output voltage (Vout) that can be set to any level lower than the input. Thus, Vout = Vin (% Ton) = Vin [Ton / (Ton + Toff)].

IC U2 achieves a constant voltage by varying the on-time (T on) and overall switching cycle time. When the switch is off, the current I through coil L3 is zero and the output voltage Vout is at its rated value. The output voltage across the capacitor Co will eventually drop below the rated value since there are only components that supply current to the external load. This undervoltage is monitored by the switching control circuit and drives switch Q1 into saturation. The coil current begins to flow from the input voltage Vin, passes through the switch and the capacitor Co in parallel with the load and rises at a rate of ΔI / Δt = V / L. Where ΔI is the rate of change of current in coil L3, Δt is the rate of change of time, and V and L are the voltage and inductance in coil L3. The voltage across the coil is equal to Vin-Vsat-Vout, i.e. (input voltage)-(saturation voltage of the switch of ICU2)-(output voltage), and the peak current is IL = [(Vin- Vsat-Vout) / L] t.

At the end of the on-time, the switch is turned off. When the magnetic field of the coil begins to decay, it produces a reverse voltage that favors the bias D1 and the peak current decays at a rate of ΔI / Δt = V / L when the power is supplied to the capacitor Co and the load. . During quiescent operation, the output voltage is constant and the system operates in discontinuous mode.

Referring to FIG. 9, a circuit example of the second conversion circuit 20 for converting alternating current into direct current is shown. This conversion circuit is composed of a pair of input terminals 34 for electrically connecting to an AC power supply and a pair of output terminals 36 for supplying direct current to the first conversion circuit 18 shown in FIG. .

The second conversion circuit 20 further includes resistors Ron (330K 400V), Roff (150K) and Rs (2M), a capacitor C1 (0.15 μF film capacitor), C 2 (22 μF 35V polar electrolytic capacitor), C3. (1 μF polar electrolytic capacitor), C4 (2.2 μF 450V polar electrolytic capacitor) and C _T1 (150 pF film capacitor), diodes D1 (1N4937), D2 (1N4937), D3 (1N4935) and D4 (1N4006), It is composed of coils L1 (1 m H 400 V) and L2 (70 μH), a MOS type field effect transistor Q1, a fuse F1 (0.25 A fuse), and an IC U1 (UC C3889 manufactured by Motorola). These circuit components are electrically connected as shown in FIG. It will be appreciated that all of the circuit components for the second conversion circuit 20 are readily applicable to one of ordinary skill in the art.

The second conversion circuit 20 converts an AC input of a second voltage in the range of about 80 volts to about 265 volts to a DC of a first voltage of about 12 volts. The second conversion circuit uses cascaded flyback converters operated in discontinuous current mode. Two series flyback converter stages are used to perform the voltage transformation. The first flyback converter stage comprises a coil L1 whose input voltage is switched when the MOS field effect transistor Q1 is turned on. The electric power stored in the coil L1 as a current increases linearly until the MOS field effect transistor Q1 is turned off. Then, the coil L1 discharges to the capacitor C1 with which the diode D1 is conducting. In a steady state, the switching action of the MOS field effect transistor Q1 produces a net DC voltage across the capacitor C1 which is the output capacitor of the first flyback converter stage.

The second flyback converter stage comprises a coil L2 which switches between both ends of the capacitor C1 while the MOS field effect transistor Q1 is on. The voltage across coil L2 is negative with respect to ground voltage, and the power stored in coil L2 as a current increases linearly. When the MOS field effect transistor Q1 is switched off, the coil L2 discharges into the capacitor C2. A constant voltage DC output is obtained across the capacitor C2 which can be controlled by changing the on-time of the MOS field effect transistor Q1. Capacitor C3 maintains the supply voltage to IC U1 within the UVLO hysteresis region of IC U1 when the second flyback converter stage begins to operate. Capacitor C4 is a bulk input capacitor and is rated at 450 VDC or higher, and diodes D1 to D4 are 800 volt diodes.

Since the circuit operates in discontinuous coil current mode, the diode switching speed does not necessarily have to be accurate. However, the diode should have a recovery time of 0.25 ms or less. Operating at sufficiently high frequencies, standard 1N4937, 600 volt diodes can be used for high voltage switching, and low voltage 1N4935 diodes can be used as output diodes. Timing capacitor C _T1 and resistors Ron and Roff are used to set the value of the operating frequency of the circuit. Resistor R 1 is rated at about 400 volts. The resistor Rs is connected in parallel with the timing capacitor C _T1 and is used to discharge the capacitor C _T1 when the converted output voltage goes to zero. The resistor Rs is also only provided to set the maximum off-time of the MOS field effect transistor Q1 and is used to program the start-up phase of the converter and the minimum frequency for short-circuit protection. is there.

Referring to FIG. 10, a battery charger 10 according to another embodiment of the present invention includes (a) a set of AC input terminals 38, (b) a set of DC input terminals 40, and (c). A set of output terminals 42, (d) an AC-DC converter 44 electrically connected between the AC input terminal 38 and the output terminal 42, and (e) a DC input terminal 40 and the output terminal 42. And a DC-DC converter 46 electrically connected therebetween. AC-DC converter 44 converts an alternating voltage in the range of about 80-265 volts to a DC voltage of about 12 volts suitable for charging batteries. The DC-DC converter 46 converts a DC voltage of about 25 volts into a DC output voltage of about 12 volts. The AC-DC and DC-DC conversion circuits shown in FIGS. 8 and 9 should be used for the AC-DC converter 44 and the DC-DC converter 46 of the embodiment of the battery charger 10 shown in FIG. 10, respectively. You can The battery charger 10 includes (a) an AC adapter 24 electrically connected to an AC input terminal 38, (b) a DC adapter 28 electrically connected to a DC input terminal 40, and (c) a housing 22. Can be further provided, all of which are the same as those described in the previous embodiment.

When charging the battery using the battery of the automobile, the user inserts the DC adapter 28 into the cigarette lighter receptacle of the automobile. In a typical mobile phone equipped with batteries such as nickel-cadmium battery, nickel-hydrogen battery (NiMH), lithium-ion chemical reaction battery, etc., the battery charger 10 can charge the battery in about 4 to 5 hours. When charging the battery with an AC power source, the user plugs pin 26 of the AC adapter directly into the wall power outlet unit. With AC power input, the battery charger 10 charges the car phone battery described above in about 8 to 10 hours. When used with a car telephone, the battery charger 10 preferably utilizes the data port or charging port of the telephone to eliminate the need for a bulky desktop housing to hold the telephone. The dimensions of the battery charger housing should not exceed 76.2 mm (3 in) long x 25.4 mm (1 in) high x 50.8 mm (2 in) wide.

The above-described embodiments of the present invention are only some possible examples of the battery charger 10 of the present invention. The present invention is not limited to operation according to the embodiments described in the present description, and the invention disclosed herein does not depart from the spirit and scope of the present invention in order to obtain equivalent effects. It should be understood that it is easy for a person skilled in the art to change into For example, a power line attached to a plug could be used instead of a sliding or rotating pin for an AC adapter to actuate a wall outlet unit.

[Brief description of the drawings]

FIG. 1 is a block diagram of a dual power source battery charger according to an embodiment of the present invention.

FIG. 2 is a perspective view of a dual power source battery charger according to an embodiment of the present invention.

FIG. 3 is a side view of the battery charger of FIG.

FIG. 4 is a bottom view of the battery charger of FIG.

FIG. 5 is a perspective view showing a battery charger according to another embodiment of the present invention.

6 is a side view of the battery charger of FIG.

FIG. 7 is a bottom view of the battery charger of FIG.

FIG. 8 is a diagram showing a circuit example of a DC conversion circuit used in the battery charger of the present invention.

FIG. 9 is a diagram showing a circuit example of an AC conversion circuit used in the battery charger of the present invention.

FIG. 10 is a block diagram of a battery charger according to another embodiment of the present invention.

[Explanation of symbols]

 10 Battery Charger 12 First Set Input Terminal 14 Second Set Input Terminal 16 Output Terminal 18 First Conversion Circuit 20 Second Conversion Circuit 22 Shell 24 AC Adapter 26 Pin 28 DC Adapter 30 Input Terminal 32 Output Terminal 34 Input Terminal 36 Output Terminal 38 AC Input Terminal 40 DC Input Terminal 42 Output Terminal 44 AC-DC Converter 46 DC-DC Converter

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // H02M 3/00 H02M 3/00 Y 7/06 8726-5H 7/06 A (73) Practical use Patent holder 597029284 738 Arrow Ground Circle, Covina, CA 91722, U.S.A. S. A. (72) Inventor Harry Maquitarian, West Coast Pioneer Drive, Number 110, No. 110, Glendale, California 91203, USA

Claims (14)

[Utility model registration claims] 1. A dual power source battery charger for charging a rechargeable battery having a power input terminal, comprising: (a)
A first set of input terminals for electrically connecting to a first voltage direct current power supply; (b) a second set of input terminals for electrically connecting to a second voltage alternating current power supply; (c) A set of output terminals for electrically connecting to a power input terminal of a rechargeable battery, and (d) for converting a direct current of a first voltage into a direct current of a third voltage suitable for charging the battery. A first conversion circuit electrically connected between a first set of input terminals and an output terminal of the battery charger; and (e) a first alternating current of a second voltage.
It is characterized by comprising a second conversion circuit electrically connected between a second set of input terminals and a first set of input terminals of the battery charger for converting the voltage into direct current. Battery charger. 2. The apparatus further comprises an AC adapter for interfacing the battery charger to the AC power outlet, the AC adapter electrically connected to the second set of input terminals. The battery charger according to claim 1. 3. The AC adapter is a pair of pins for connecting and operating a residential power outlet unit.
The battery charger according to claim 2, wherein the battery charger comprises: 4. A direct current adapter for connecting and operating the battery charger to a direct current power outlet, the direct current adapter being electrically connected to the first set of input terminals. 1. The battery charger described in 1. 5. The battery charger according to claim 4, wherein the DC adapter further comprises a device for connecting and operating with a cigarette lighter receptacle of a vehicle. 6. The battery charger according to claim 1, further comprising a shell for accommodating the first and second sets of input terminals, output terminals, and first and second conversion circuits. . 7. A dual power source battery charger for charging a rechargeable battery having a power input terminal, comprising: (a)
A first set of input terminals for electrically connecting to a DC power supply of a first voltage, and (b) electrically connecting to a first set of input terminals for connecting and operating a battery charger to a DC power outlet. A DC adapter, and (c) a second set of input terminals for electrically connecting to an AC power supply of a second voltage; (d)
An AC adapter electrically connected to the second set of input terminals for connecting and operating the battery charger to the AC power outlet; and (e) electrically connecting to the power input terminal of the rechargeable battery. A set of output terminals, and (f) a first set of input and output terminals of the battery charger for converting a direct current of a first voltage into a direct current of a third voltage suitable for charging a battery A first conversion circuit electrically connected in between,
(g) A second conversion electrically connected between the second set of input terminals and the first set of input terminals of the battery charger for converting the second voltage alternating current into the first voltage direct current. A battery charger comprising a circuit and a battery charger. 8. A shell further comprising a first and second set of input terminals, output terminals, and first and second conversion circuits disposed within the shell, and a DC adapter and an AC adapter included in the shell. The battery charger according to claim 7, which is attached to an outer surface of the battery. 9. A dual power source battery charger for charging a rechargeable battery having a power input terminal, the battery charger comprising:
A first set of input terminals for electrically connecting to a first voltage alternating current power supply; (b) a second set of input terminals for electrically connecting to a second voltage direct current power supply; (c) A set of output terminals for electrically connecting to a power input terminal of a rechargeable battery, and (d) for converting an alternating current of a first voltage into a direct current of a third voltage suitable for charging the battery. A first converter circuit electrically connected between a first set of input terminals and an output terminal of the battery charger; and (e) a third voltage suitable for charging the battery with a direct current of a second voltage. And a second conversion circuit electrically connected between the input terminal and the output terminal of the second set of the battery charger for converting into DC. 10. An AC adapter for connecting and operating the battery charger to an AC power outlet, the AC adapter being electrically connected to the first set of input terminals. 9. The battery charger according to item 9. 11. The battery charger according to claim 10, wherein the AC adapter is composed of a pair of pins for connecting and operating to the residential power outlet unit. 12. The apparatus further comprises a DC adapter for connecting and operating the battery charger to the DC power outlet, wherein the DC adapter is electrically connected to the second set of input terminals. 9. The battery charger according to item 9. 13. The battery charger according to claim 12, wherein the DC adapter comprises a device for connecting and operating to a cigarette lighter receptacle of an automobile. 14. The battery charger according to claim 9, further comprising a shell for housing the first and second sets of input terminals and for housing the first and second conversion circuits. .