CN1114123A - Tracking external power supply - Google Patents

Tracking external power supply Download PDF

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Publication number
CN1114123A
CN1114123A CN94190638A CN94190638A CN1114123A CN 1114123 A CN1114123 A CN 1114123A CN 94190638 A CN94190638 A CN 94190638A CN 94190638 A CN94190638 A CN 94190638A CN 1114123 A CN1114123 A CN 1114123A
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CN
China
Prior art keywords
external power
power source
electronic equipment
power supply
voltage
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Granted
Application number
CN94190638A
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Chinese (zh)
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CN1060889C (en
Inventor
大卫·M·德莫罗
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Motorola Solutions Inc
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Motorola Inc
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Publication of CN1114123A publication Critical patent/CN1114123A/en
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Publication of CN1060889C publication Critical patent/CN1060889C/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/1607—Supply circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/007188—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters
    • H02J7/007192—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature
    • H02J7/007194—Regulation of charging or discharging current or voltage the charge cycle being controlled or terminated in response to non-electric parameters in response to temperature of the battery

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)

Abstract

An external power supply (22) powers an electronic device (20) having rechargeable cells (70). The external power supply (22) provides power (26) having a voltage which tracks the rechargeable cells. The voltage of the external power supply preferably tracks with an offset above the voltage (86) of the rechargeable cells. An external power supply type indicating device (130), such as a resistor, indicates to the electronic device the type of external power supply. The external power supply (22) can thus provide power for fast-charge or trickle-charge operations, and charge control circuitry within the electronic device is capable of accurately controlling charge of the rechargeable cells based upon the type of external power supply indicated by the resistor.

Description

Tracking external power supply
The application is the continuation of part application of the following U.S. Patent application of David M.DeMuro: the applying date is that September 2, number of patent application in 1993 are 115074, name is called " have the charge inside adjuster and be used to control the electronic installation of the charging current that adds to it and relevant method thereof with temperature sensor "; The applying date is that June 30, number of patent application in 1993 are 083571, name is called " have the charge inside adjuster and be used to control the electronic installation of the charging current that adds to it and relevant method thereof "; The applying date is that November 9, patent application preface in 1993 are 149686, name is called " method and the device of determining external power supply type ".
The present invention relates to use the rechargeable power supply electronic equipment powered, be specifically related to have the electronic equipment and related methods of rechargeable power supply, this rechargeable power supply can connect an external power source, and this external power source can provide working power that the rechargeable power supply of this electronic equipment is recharged.
Many electronic equipments are configured such type: it allows by the battery power that comprises one or more secondary battery unit batteries.In some cases, when this electronic equipment is not or can not places near permanent or other fixing power supply, need to use battery supply to this power electronic equipment.In other cases, use battery supply to this power electronic equipment to increase the portability of this equipment, because do not need power cable to make electronic equipment be connected to permanent or other fixing power supply.Typically, comprise the one or more secondary battery unit batteries that are used for the battery supply of this power electronic equipment be directly with establish that electronic equipment carries or this electronic equipment of packing in.
But, because the energy that battery supply can only memory limited quantity, so battery supply is subjected to the restriction of the energy storage capacity of this battery supply to this power electronic equipment.Make the stored energy discharge of this battery supply with this electronic equipment of battery power.In case the discharge of the stored energy of battery supply surpasses certain degree, just need to change this battery supply this electronic equipment can be worked on.Increase the energy storage capacity of battery supply, such as the secondary battery unit cell number that comprises this power supply by increase, this will increase the volume (and weight) of this power supply.The method of the energy storage capacity of this increase battery supply has reduced the portability of this electronic equipment when battery supply carries with electronic equipment.Therefore, when design during battery supply, be equipped with between the portability of electronic equipment of this battery supply and trade off increasing energy storage capacity and reduction.
Portable or movable wireless telephone set is a kind of typically by the electronic equipment of battery power.This battery supply typically directly carries with this radiophone, and its volume and weight can exceedingly not limit the portability of this radiophone.Radiophone comprises radio receiving-transmitting unit, and this transceiver comprises transmitter circuitry and the receiver circuit that sends and receive modulated signal respectively.In the operation of typical radiophone, its receiver circuit is partly powered continuously when wait receives the alerting signal that is indicated to this radiophone.After this, the transmitter circuitry of this radiophone part also powers up so that transmit modulated signal from it.
The radiophone of working in many cellular communication systems is constructed for sending modulated signal from it, also receives the modulated signal (being sent on the channel that separates by this radiophone modulated signal that send and that send to it) that sends to it simultaneously.The radiophone of in other cellular communication system, working be configured in case non-while time durations and with this radiophone two-way communication during send and receive modulated signal, be powered at this Receiver And Transmitter circuit part of non-while time durations.
To be called this radiophone below in the time that the receiver circuit of this radiophone partly is powered the transmission of the signal of waiting for the indication incoming call simultaneously is the time that is in " standby " mode.(certainly, only be noted that when customer requirements to begin when finishing call afterwards that the user of radiophone also often provides working power to this radiophone; Do not providing working power At All Other Times, and this radiophone does not power up and receives the signal that sends to it to this radiophone.That is to say that the user of radiophone can select the radiophone of inoperation " standby " mode to receive the incoming call that sends to this radiophone, and this radiophone of just during this user begins call, powering).
Usually, it is bigger than the amount of operation its receiver circuit part desired energy to operate the amount of the desired energy of transmitter circuitry part of this radiophone.And because physical device is lower than desirable efficient, the part energy that is added to this radiophone is converted into heat energy, causes the thermal accumlation of radiophone.Because the transmitter circuitry of operate wireless telephone set partly needs more energy, so only when receiver circuit is partly worked, have corresponding more substantial heat to produce at the transmitter circuitry part duration of work ratio of radiophone.
Developed and the available rechargeable battery power supply of forming by one or several rechargeable battery element cell on market.What some were such is the structure that is designed for the radiophone power supply at commercially available, rechargeable battery power supply.It is favourable using the rechargeable battery power supply, because its rechargeable primary cell can charge by adding the charging current that is produced by power supply.In case after recharging, this rechargeable battery power supply just can re-use.The rechargeable battery power supply rechargeable of some structures and re-use nearly even above 500 times.
As previously mentioned, the rechargeable battery power supply typically is made up of one or several secondary battery unit battery.These secondary battery unit batteries are with series connection (or alternate manner) connection, and in the public shell of packing into typically.Shell constitutes battery supply with the secondary battery unit battery, often is also referred to as battery pack.For simplicity, this structure is usually also used general terms " battery ".This specification will often use the term of this simplification.
The secondary battery unit battery of rechargeable battery power supply is made of the material of various different structures.For example, the rechargeable battery element cell can be by lithium (Li) material, NI-G (Ni-Cd) material or nickel metal hydride (NiMHO 2) the material formation.The secondary battery unit battery that these different materials constitute presents different characteristics between its charge period.
Battery charging equipment also is commercially available, allows the rechargeable battery power supply is recharged.The battery charger that comprises this battery charging equipment typically comprises a power supply, when suitably receiving charging device and receive working power, is used to add working power and the rechargeable battery power supply is recharged.
The working power energy that is added in the rechargeable battery power supply is transformed to chemical energy, and this chemical energy is by the rechargeable battery element cell storage of battery supply.At the time durations in a past working power is added to that the secondary battery unit battery becomes this rechargeable battery element cell to recharge fully.But, because physical device is lower than desirable efficient, being transformed to heat energy so be added in the energy of the definite part of secondary battery unit battery, this causes secondary battery unit battery thermal accumlation.
Some battery charging equipments are this structural types: its permission electronic equipment also has battery supply, and the two receives working power together.This battery charging equipment not only provides working power that the rechargeable battery element cell of battery supply is recharged, but also provides working power to allow electronic device works.
For example, it is available allowing radiophone and rechargeable battery reception working power that the secondary battery unit battery charge of battery pack is allowed the battery charging equipment of the structure type of this radiophone circuit working simultaneously.But, as previously mentioned, in physical device, produce the byproduct of heat as radiotelephone circuit work.And, produce the byproduct of heat simultaneously as the process of the secondary battery unit battery that recharges this battery supply.
The various rechargeable battery structures that comprise the secondary battery unit battery of rechargeable battery power supply present multiple charging curve (this is the voltage curve with the function scale of time).In time during recharging the secondary battery unit battery of this structure, because the amount of energy that is stored in wherein increases, the voltage level of the secondary battery unit battery of this power supply also increases.The supply voltage that is added to the rechargeable battery power supply must be greater than rechargeable battery power source voltage level, so that energy is transferred to battery supply.But,, be converted into heat energy corresponding to the pith of the energy of this voltage difference when the supply voltage that is added to battery supply during significantly greater than the voltage level of battery supply.
When the rechargeable battery power supply is realized as a radiophone as the part of electronic equipment, be added to the heat energy that produces during the rechargeable battery power supply in charge power supply and cause the electronic equipment heating.This heating of electronic equipment can make the user of electronic equipment uncomfortable but also influence its performance.
What therefore, need is that charge power supply can be added to the rechargeable battery in the electronic equipment and not produce the device of excessive heat energy.
Portable a, battery powered apparatus as a cell phone in, by the power supply input of an outside is provided so that this user can from as the main power source of indoor electric current or this equipment of power operation of vehicle so that keep battery supply.And there is also a desire for the battery charger of this device interior, and being used to recharge the battery pack of this equipment, it can be in this device interior or outside.This equipment and internal cell charger thereof require to provide required suitable voltage of this equipment and battery with the charging internal cell or to this power devices at power supply of this device external or adapter.
In addition, various external power sources are often arranged.For example, high-power type can provide quickly charging battery, and low-cost, low-power type can provide the battery charging battery.Because according to connecting which external adapter, the work of internal charger is with difference, this equipment must detect and have which class external power adapter.
Therefore, also need to be provided for detecting the type of the external power adapter of receiving an equipment and change the operation of equipment along with the variation of the type of power supply adaptor and battery.The present invention has bigger system flexibility and has the improved performance of all types of external power sources.
Will better desirable the present invention when reading with reference to the accompanying drawings, wherein:
Fig. 1 is that the diagram that is connected across the typical battery charge curve in the voltage of measuring on the output of secondary battery unit battery of rechargeable battery between its charge period is drawn as the function of time;
Fig. 2 is the block diagram that is connected to the external charger of an electronic equipment according to the present invention;
Fig. 3 is the block diagram that is connected to another external charger of an electronic equipment according to the present invention; With
Fig. 4 is a view of describing an external charger receiving a cellular radiotelephone according to the present invention.
As mentioned above, portable electric appts is often by a rechargeable power supply power supply.When rechargeable power supply exhausts the energy of storage, use battery charging equipment that the rechargeable battery element cell of rechargeable power supply is recharged.
The battery charging equipment of several structures is available, and they allow portable electric appts to place together with the rechargeable power supply that carries, so that working power rechargeable battery element cell and this electronic device circuitry to rechargeable power supply is provided.
But because power transfer is not a total efficiency between battery charging equipment and this electronic equipment, the energy of the definite part of the working power that is produced by battery charging equipment is converted into heat energy, and the temperature of this electronic equipment is risen.And when the voltage level of the working power that is produced by battery charging equipment was higher than the voltage level of secondary battery unit battery of rechargeable power supply significantly, the major part of the working power that is produced by this battery charging equipment was converted into heat energy.As a result, the significant rising appears in the temperature by this rechargeable power supply electronic equipment powered.Under specific situation, electronic equipment comprises a radiophone that is operated in the cellular communication system, and the working power that is produced by battery charging equipment is converted to heat energy and causes this radiophone temperature to rise.This rising of radiophone temperature can make this radiophone user uncomfortable, and the performance that influences this radiophone.
When the voltage level of the working power that is produced by external power source was followed the tracks of the rechargeable battery cell voltage level of rechargeable power supply, the amount of the working power energy that is produced by this battery charging equipment was converted into heat energy and reduces to minimum.
When battery charging equipment comprised the power supply of level-variable, it was a constant voltage level that the voltage level of the working power that is produced by this power supply need not.On the contrary, the voltage level of this working power can change, thereby has reduced the amount that is converted into the energy of heat energy between the primary cell charge period of rechargeable power supply.
By the level-variable power supply that comprises the battery charging equipment with the voltage level of indicating the secondary battery unit battery that recharges power supply is provided, can make the power supply of level-variable power work with the voltage level of generation work, this voltage level is corresponding to the voltage level that still is a bit larger tham rechargeable power supply secondary battery unit battery, and the heating that occurs during primary cell recharges can be reduced.
Also as mentioning in front, the voltage level of rechargeable power supply secondary battery unit battery along with during adding working power to it by the increase of the amount of the energy of secondary battery unit battery storage and increase.
Fig. 1 is the diagram of the representative cells charging curve of nickel-cadmium rechargeable primary cell.The battery charge curve be by measure on the output that jumps to nickel-cadmium rechargeable battery element cell, constitute as the voltage curve of the function of time.
In Fig. 1, draw along the longitudinal axis 10 with the voltage of volt scale, and with second scale time along transverse axis 12 expressions.The curve 14 that obtains is usually increasing so that recharge in time of this secondary battery unit battery corresponding to adding working power to it.As directed, general increase is not linear.The voltage level that on behalf of the current level of the working power that is added in the rechargeable battery power supply, the point 16 of curve 14 and 17 change.In beginning with in the figure with the time durations of " quick charge stage " expression, the current level that is added to the working power of secondary battery unit battery is quite high value.Then, with the time durations (corresponding to curve 14 parts between the point 16 and 17) in " trick charge stage ", the current level that is added to the working power of this battery is first value that reduces in the drawings.After this, with the time durations of " keeping the charging stage " expression, the current level that is added to the working power of this primary cell is second value that reduces in the drawings.
The feature charging curve of the battery structure of other type can be represented similarly.Though the battery structure of other type has the charging curve of further feature shape, owing to increased by these battery storage amount of energy, the total increase of voltage is correct generally speaking.In any case, adding to the voltage of secondary battery unit battery by making the level-variable power supply trace working power that comprises battery charging equipment, the heat energy of generation has reduced.
Fig. 2 illustrates the external power source 22 that is connected that can throw off with an electronic equipment 20 according to the present invention.External power source 22 comprises a transformer 112, a rectifier 114 and a voltage regulator 120.114 (AC) 120 volts that exchange from the wall outlet 140 of feed-line electric current of the transformer 112 of Fig. 2 and rectifier are transformed to direct current (DC) voltage.Rectifier 114 is full-wave rectifier preferably.And be preferably in the regulating circuit that is provided for the voltage of level and smooth rectification after the transformer 112.Electronic equipment 20 comprises the battery by a plurality of rechargeable battery element cells 70.The rechargeable battery element cell of forming this battery can comprise that a secondary battery unit battery constitutes by any amount of secondary battery unit battery.Similarly, a rechargeable battery element cell can easily be adapted to have two or several secondary battery unit batteries.The rechargeable battery element cell 70 of electronic equipment 20 is by the power source charges that provides from external power source 22.
External power source 22 has a voltage regulator 120, and the voltage signal that its response receives from electronic equipment 20 on circuit 86 is followed the tracks of the voltage of rechargeable unit battery 70.The voltage regulator 120 of external power source 22 provides a voltage with respect to the voltage of rechargeable unit battery 70 for electronic equipment 20.Follow the tracks of rechargeable battery element cell power supplys 70 voltages, electronic equipment 20 outsides by providing, the heat dissipation of this electronic equipment internal has reduced.
External power source 22 work are to produce the working power of any level of various voltage levels on circuit 26.Various voltage levels can be the voltage increments that increases progressively of variable voltage level or separation continuously.When external power source was received electronic equipment 20 on connector 34, the circuit 26 of electronic equipment 20 was connected, to receive the working power that is produced by external power source 22.Circuit 26 also is connected so that the parts of working power to electronic equipment 20 to be provided.For example, in a preferred embodiment, electronic equipment 20 is portable radio telephone sets, and in such embodiments, when connecting external power source 22, it can give the parts power supply of radiophone.Alternately, rechargeable battery element cell 70 can be connected the parts power supply to electronic equipment 20.This rechargeable primary cell 70 can be connected internal part power supply, even external power source 22 is when receiving electronic equipment 20 on connector 34.
The power supply that is provided by external power source 22 has the voltage of being controlled by the voltage regulator 120 of external power source 22.External power source 22 also comprises a resistance 130, and it receives the type of the external power source of electronic equipment 20 to electronic equipment 20 indications.Transistor 58 responses in the electronic equipment 20 are partly controlled the power supply that offers rechargeable battery element cell 70 from external power source 22 by the type of the external power source of resistance 130 indications.Transistor 58 is regulated electric current or the charging that offers rechargeable battery element cell 70.Voltage regulator 120 is used to regulate the voltage that is added to electronic equipment 20 from external power source 22.
Resistance 130 has the type of following the tracks of cell voltage to electronic equipment 20 these external power sources 22 of indication.More old-fashioned power supply does not comprise necessary voltage-tracing circuit.And, more old-fashioned power supply but comprise be used to the to charge battery control circuit of control, in arrangement of the present invention, it is to be placed in the electronic equipment 20.When electronic equipment 20 detects the old-fashioned power supply that does not have resistance 130, this electronic equipment 20 will know that old-fashioned power supply can not provide suitable external voltage following function.This resistance that is called manual testing's resistance can have about 33000 ohm resistance for the quick charge external power source, and is about 10000 ohm for the trick charge external power source.Alternately, resistance 130 can other indication element as X-bridge-electric capacity with single resonance characteristic to, diode as having unique reverse bias or hitting Schottky diode or Zener diode towards voltage, perhaps other semiconductor such as memory element replace.And can use the array of these elements, as electric resistance array.Therefore, except guaranteeing the necessary electric rate charging of electronic equipment 20 with external power source 22, resistance 130 also guarantees not allow electronic equipment 20 to use old-fashioned power supply.
Based at the measured value at resistance 61 two ends with by the type of the external power source of resistance 130 indications, the transistor 58 of electronic equipment 20 is Control current or to the charging of rechargeable battery element cell 70 partly.Controller 74 detects the type of external power source 22 according to the resistance of resistance 130.Controller can be according to special charging typical case of type selecting of the external charger of being indicated by resistance 130, as shown in fig. 1.
Foreign current 22 can provide one of two level of electric current typically.One class foreign current 22 provides high level of current quick charge rechargeable battery element cell 70.Low current is provided another kind of external power source 22 so that trick charge rechargeable battery element cell 70.Controller 74 provides a control voltage to comparator 63.Comparator 63 relatively should control voltage and the voltage of being measured at resistance 61 two ends by comparator 62.The output of comparator 63 is used for Control current by transistor 58 or from the charging of external power source 22 to rechargeable battery element cell 70.Controller 74 provides control voltage to comparator 63 according to the type of the external power source of being indicated by resistance 130.Except the type by the external power source 22 of resistance 130 indication, controller 74 also can be considered other parameter.These parameters of being considered by controller 74 can be included in the present desired current drain of other parts or the temperature of rechargeable battery element cell 70 for example of voltage, the electronic equipment 20 of rechargeable battery element cell 70.
As previously mentioned, when the mains voltage level that is added in rechargeable battery element cell 70 only was a bit larger tham the voltage that can show the charging accumulator element cell, recharging most effectively of rechargeable battery element cell 70 carried out.When the voltage that is provided by external power source 22 surpassed the voltage of rechargeable battery element cell 70 widely, the major part of power supply was transformed to heat energy.This heat energy has caused heat loss in the electronic equipment 20.But, make the voltage-tracing that provides by external power source 22 recharge the voltage of secondary battery unit battery 70, reduced from the heat energy of the power conversion of external power source 22.Therefore, because external power source 22 has a voltage regulator 120, the voltage of the rechargeable battery element cell 70 on its response line 86 has reduced the heating of electronic equipment 20.
In addition, according to a preferred embodiment of the invention, the voltage regulator 120 of external power source 22 provides a voltage to electronic equipment on circuit 86, and its skew is higher than the voltage of rechargeable battery element cell 70.Preferably, the voltage that offers electronic equipment 20 by external power source 22 about 1.4 volts of skew on by the voltage of the rechargeable battery element cell 70 of circuit 86 indications.Therefore, the voltage regulator 120 of external power source 22 is programmed provides skew external power source 22 about 1.4 volts.These about 1.4 volts of skews are preferably used in normal 6 volts of nickel metal hydride (NiMHO 2) or nickel-cadmium (Ni-Cd) battery.About 1.4 volts of skews are at transistor 58, and resistance 61 and diode 65 two ends produce about 0.9 volt pressure drop, produce about 0.5 volt of pressure drop at rechargeable battery element cell two ends.But for such battery, this deviation range can be about 0.5 volt to about 3.0 volts, above on the charging control section part of also considering at electronic equipment 20 during listed pressure drop, approximately be this cell voltage a thirtieth to half.In addition, when use have 8.4 volts rated voltage lithium battery or when having the lithium solid state battery of 9.0 volts of rated voltages, higher by the skew that the voltage regulator 120 of external power source 22 provides.For example, 12 volts of batteries preferably have an appointment 1.9 to about 5.0 volts skew.
By parts such as transistor 58, resistance 61 or the diode 65 of power consumption from electronic equipment 20 inside shifted out, this skew helps to reduce the heating of electronic equipment 20.Offset voltage also provides suitable pressure drop on transistor 58, resistance 61 and diode, be used for electric current or charging control by the controller 74 that has minimum heat in these electronic equipment 20 inside.
Fig. 3 illustrates the block diagram of receiving an external power source 23 of electronic equipment 20 according to another embodiment of the invention through connector 35.External power source 23 is received in a control voltage of indication rechargeable battery element cell 70 voltages on the circuit 86.External power source 23 provides a charging voltage to rechargeable battery element cell 70 according to the voltage of the rechargeable battery element cell on the circuit 86 through transistor 58.External power source 23 also comprises an external charger type indicator part, and as diode 135, its indication is connected to the type of the external power source of electronic equipment 20.
External power source 23 comprises a pulse width modulator 160, replaces the voltage regulator 120 of Fig. 2 embodiment.In the embodiment shown in fig. 3, pulse width modulator 160 will be desired VD from the DC converting of the adapter input of the cigarette lighter assembly of automobile for example.According to the voltage of the rechargeable battery element cell 70 of input on circuit 86, pulse width modulator 160 modulation are from the pulsewidth of the input of the cigarette adapter connector 150 of automobile.Smoothing circuit such as capacitor 170 are used in output in pulse width modulator 160, provide level and smooth direct current to output to electronic equipment 20.Though the embodiment of Fig. 3 illustrates the pulse width modulator 160 of the connector 150 that for example is connected to a cigarette adapter, pulse width modulator 160 also can be operated in other input voltage.For example, when using at least one rectifier diode, 120 volts of ac line voltages can offer pulse width modulator 160.
Translate into the schematic diagram of Fig. 4 now, show a radiophone of generally representing with label 620.The electronic equipment 20 of Fig. 2 or 3 embodiment can be the radiophone 620 with element of this electronic equipment 20, described element is placed in the shell of radiophone 620 of Fig. 4, except rechargeable battery element cell 70, the battery pack 624 that comprises shown here.
Radiophone 620 utilizes circuit 626 and 628 to receive external power source 622, and these two circuits 626 and 628 are received external power source 622 connector of radiophone 620 by a pin connector 630.Also show feed-line electric current wall outlet 642 among Fig. 4, allow external power source to receive conventional domestic power supply.Though feed-line electric current wall plug 642 comprises a connector that allows to receive conventional domestic power supply, other connector that allows to receive other type of power certainly is possible similarly.
Because external power source 622 is placed away from radiophone 620, but utilizes circuit 626 and 628 to receive it, thus radiophone 620 can operate easily by the user, and no matter the connection between radiophone 620 and the external power source 622.Because the voltage level of the working power that external power source 622 produces is followed the tracks of the voltage level of this battery pack, thus the rechargeable battery element cell of this battery pack to recharge by realizing and do not have excessive energy conversion effectively be heat energy.
In a word, the invention provides a kind of external power source of tracking, be used to provide power supply that the rechargeable battery element cell is charged.This external power source provides the power supply with voltage following the tracks of the rechargeable battery cell voltage.The voltage of rechargeable battery element cell passes to external power source and external power source provides a floating voltage to this response.The supply voltage that external power source provides preferably is offset scheduled volume of voltage of rechargeable battery element cell.This voltage is offset with the heat dissipation in this electronic equipment of further minimizing and the variation of operating the charge inside control assembly is provided, and effective charging that the rechargeable battery element cell is provided.External power source can be can be to the macrocell of this rechargeable battery element cell quick charge, high-power type, perhaps another situation, and it can be to be merely able to low current type that this rechargeable battery element cell is charged at a slow speed.The type of external power source is indicated by a resistance, and electronic equipment responds this resistance, discerns the classification of external power adapter by the value identification external power supply type that detects this resistance in the power supply externally.

Claims (10)

1, a kind of external power source that is connected to an electronic equipment, this electronic equipment have can use the charging control circuit of described external power source to one or several rechargeable battery element cell charging, it is characterized in that described external power source comprises:
The connector that can receive this electronic equipment is to provide external power source to described electronic equipment and the next signal of this electronic equipment of reception; With
A supply convertor is operationally received described connector, provides this external power source to this electronic equipment according to the signal that receives from this electronic equipment.
According to the external power source of claim 1, it is characterized in that 2, described supply convertor comprises a voltage control circuit operationally receiving described connector, its response is from the voltage of the next signal trace rechargeable battery element cell of this electronic equipment.
According to the external power source of claim 2, it is characterized in that 3, described voltage control circuit has the voltage control characteristic that response is followed the tracks of with a variation that is higher than the rechargeable battery cell voltage from the next signal of this electronic equipment.
According to the external power source of claim 3, it is characterized in that 4, described voltage control circuit is with about a thirtieth voltage control characteristic to the variation tracking of making an appointment with half of this rechargeable battery cell voltage.
According to the external power source of claim 4, it is characterized in that 5, described voltage control circuit has with about 0.2 volt of voltage control characteristic of following the tracks of to about 3.0 volts variation.
6, according to the external power source of claim 1, it is characterized in that, further comprise and operationally receive the external charger type indicating device of described connector to the used external power supply type of this electronic equipment indication.
According to the external power source of claim 6, it is characterized in that 7, described external charger type indicating device further comprises a resistance, it operationally receives described connector to the used external power supply type of this electronic equipment indication.
8, according to the external power source of claim 1, it is characterized in that, further comprise another connector, it is operably connected so that provide power supply from a power supply to described supply convertor.
9, external power source according to Claim 8 is characterized in that, described another connector comprises a cigarette adapter.
10, external power source according to Claim 8 is characterized in that, described another connector comprises feed-line electric current wall outlet.
CN94190638A 1993-09-02 1994-07-29 Tracking external power supply Expired - Fee Related CN1060889C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US11507493A 1993-09-02 1993-09-02
US08/115,074 1993-09-02
US24532594A 1994-05-18 1994-05-18
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JPH08503599A (en) 1996-04-16
GB2288292A (en) 1995-10-11
ITRM940556A1 (en) 1996-02-26
IT1272798B (en) 1997-06-30
CA2144966A1 (en) 1995-03-09
GB2288292B (en) 1998-03-25
FR2709886A1 (en) 1995-03-17
BR9405568A (en) 1999-09-08
CA2144966C (en) 1997-02-25
CN1060889C (en) 2001-01-17
AU683534B2 (en) 1997-11-13
GB9509136D0 (en) 1995-07-12
WO1995006994A1 (en) 1995-03-09
AU1614295A (en) 1996-04-04
ITRM940556A0 (en) 1994-08-26

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