CN1113404A

CN1113404A - Electronic device for controlling application of a charging current thereto and associated method therefor

Info

Publication number: CN1113404A
Application number: CN94190572A
Authority: CN
Inventors: 戴维·M·德摩罗
Original assignee: Motorola Inc
Current assignee: Motorola Solutions Inc
Priority date: 1993-06-30
Filing date: 1994-06-30
Publication date: 1995-12-13
Also published as: CA2143949C; GB2285717A; GB9505466D0; WO1995001699A1; GB2285717B

Abstract

An electronic device, such as a radiotelephone, is connectable to a variable-level power source. Circuitry of the electronic device generates power-source control signals to select the power levels of the signal generated by the variable-level power source. When the electronic device comprises a radiotelephone having a rechargeable battery pack carried therewith, the variable-level power source is operative to recharge the battery cells of the battery pack when the transmitter circuitry of the radiotelephone is not being operated. When the transmitter circuitry of the radiotelephone is being operated, the battery cells of the battery pack are not recharged and the power level of the signal generated by the variable-level power source is of a level to power the transceiver circuitry of the radiotelephone.

Description

Electronic device for controlling application of a charging current thereto and associated method therefor

The present invention submits, is entitled as the continuation that " the charging current control applying electronic devices and methods therefor with internal charge adjuster ", application number are the part of 083751 patent application to by David M.DeMuro on June 30th, 1993.

The present invention relates to can be by the electronic installation of chargeable power supply power supply, be specifically related to have the electronic installation and the method thereof of rechargable power supplies, rechargable power supplies can be received an external power source, and this external power source can provide working power, can be to the rechargable power supplies charging of this electronic installation.

A lot of electronic installations can allow by the battery supply that one or more battery cells are formed it to be powered in design.In some cases, when this electronic installation be not in the time of maybe can not being placed near permanent or other fixing power supply, must use battery supply to give this electronic installation power supply.In other cases, utilize battery supply, because of not needing feed cable permanent or other fixing power supply interconnection, so can increase the mobility of this device with this electronic installation and this to this electronic installation power supply.Typically, the battery supply of being made up of one or more secondary battery unit batteries in order to this electronic installation power supply directly carries or is contained in this electronic installation with this electronic installation.

, because of battery supply can only store the energy of limiting the quantity of, so battery supply is subjected to the restriction of the energy storage capacity of this battery supply for this electronic installation power supply.Battery supply can make this battery supply stored energy discharge to the electronic installation power supply.In case the stored energy of battery supply discharges to such an extent that surpass to a certain degree, must change battery supply so that this electronic installation works on.Increase the energy memory space of battery supply, for example comprise the quantity of the element cell of this power supply, cause increasing the size (and weight) of this power supply again by increase.When battery supply carries with electronic installation, the mode of the energy memory space of this increase battery supply has reduced the portability of this electronic installation, in view of this, design is during battery supply, must carry between the portability of electronic installation of this battery supply and trade off increasing energy memory space and minimizing.

It is a kind of typically by the electronic installation of battery power that a kind of portable (or movably) radiophone comes to this.Typically battery supply directly carries with this radiophone, and size and weight can fetter the portability of this radiophone rightly.A radiophone comprises wireless transceiver circuitry, and this transceiver circuitry comprises transmitter circuitry and receiver circuit, in order to send and to receive modulated signal respectively.In the typical work of radiophone,, receive in order to indicate the signal of this radiophone incoming call with wait to the power supply of receiver circuit partial continuous.After this, the transmitter circuitry of this radiophone part also is powered, to allow to send thus modulated signal.

For being operated in radiophone that multiple cellular communication system makes in order to sending modulated signal thus, and receive the modulated signal that sends to it (modulated signal that is sent by this radiophone and the modulated signal that sends to this radiophone are to send respectively) simultaneously on the frequency channels that separates.For be operated in radiophone that other cellular communication system makes in order in the time period of non-while and with this radiophone two-way communication during send and receive modulated signal, this Receiver And Transmitter circuit part all is powered in non-time period while.

The receiver circuit of radiophone partly is powered and waits for that simultaneously send to it hereinafter is referred to as time that this radiophone is in " standby " mode (certainly in order to time of the signal of indication incoming call, the user who only is noted that at radiophone wish initial and when after this carrying out a call this user also often offer this radiophone working power; During At All Other Times, do not offer this radiophone working power, and this radiophone is not powered and receives the signal that sends to it.In other words, the user of radiophone is chosen in that the inoperation radiophone receives the incoming call that sends to this radiophone under " standby " mode, but only gives this radiophone power supply at the start time durations of call of this user).

Usually, for the quantity of the desired energy of transmitter circuitry part of operate wireless telephone set greater than being the desired amount of energy of its receiver circuit part of operation.Even because of the device of reality is lower than desirable efficient, some part of energy that is applied to radiophone is converted into heat energy, Gu Er causes this radiophone heating.Again because of the transmitter circuitry of operating this radiophone partly needs more energy, thus at the transmitter circuitry part duration of work of radiophone than only when receiver circuit is partly worked, producing more heat.

Developed the rechargable power supplies that constitutes by one or more chargeable secondary battery unit batteries already, and can be available on market.Some so commercially available, rechargeable battery power supplys have the structure that is designed for to the radiophone power supply.It is favourable using chargeable battery supply, because of this chargeable storage element cell can recharge by applying charging current on it, that produced by power supply.In case recharged, the chargeable battery power supply just can re-use.Some structure rechargeables of rechargeable battery power supply and re-using, up to in addition above 500 times.

As previously mentioned, chargeable battery supply typically comprises one or several secondary battery unit battery, and they are with series connection (or other) connection, and typically is contained in the public shell.This shell constitutes the battery supply that is commonly referred to battery pack with these element cells.For simplicity, this structure generally also is called " battery " with generic term, and this specification will use the term of this simplification sometimes.

The secondary battery unit battery of chargeable battery supply is made of various structural material, for example, can comprise lithium (Li) material, nickel-cadmium (Ni-Cd) material or nickel metal hydride (NiMHO ₂) material.The secondary battery unit battery that is made of these different materials presents different characteristics between its charge period.

Battery charging equipment also can have been bought on market, in order to allow the rechargeable battery power source charges.The battery charger that contains this battery charging equipment typically comprises a power supply, when suitably being connected to this charging device of accepting this working power, provides working power with to this rechargeable battery power source charges.

The energy that is applied to the working power of rechargeable battery power supply is converted into chemical energy, and this chemical energy is by the rechargeable battery element cell storage of this battery supply.On this secondary battery unit battery, apply working power and the rechargeable battery element cell is become be full of in the back in the past time period.But, because actual equipment is lower than desirable efficient, changed into heat energy so be added to certain part energy of secondary battery unit battery, cause the heat history of this secondary battery unit battery.

Some battery charging equipments have to be made electronic equipment and battery supply the two can accept the structure of working power.This battery charging equipment not only provides working power to the charging of the rechargeable primary cell of this battery supply but also provide working power that this electronic equipment can be worked.

For example, the radiophone that the battery charging equipment of structural type allows to have the rechargeable battery group is accepted working power with the element cell charging to this battery pack, also allow the circuit working of this radiophone, the battery charging equipment of this structural type can have been bought.Yet as previously mentioned, in the equipment of reality, produced heat as the accessory substance of radiophone circuit working, and, heat also produced as accessory substance to the element cell charging process of battery supply.

The various rechargeable battery structures of being made up of the element cell of rechargeable battery power supply present charging curve (these curves are the curves with the voltage of the function scale of time).During the element cell of this structure recharges, because of the amount of energy of its stored increases in time, so the voltage level of the element cell of this power supply also increases.The voltage level of the electric energy on being added to this battery structure is during less times greater than the voltage level of (for example big approximately 1 volt) this battery structure, and the charging of rechargeable power supply realizes most effectively.In other words, when voltage level " tracking " the rechargeable battery power source voltage level of the electric energy of this battery charge, recharging most effectively of this battery structure realized.The voltage level that is added to the electric energy of rechargeable battery power supply must be greater than rechargeable battery power source voltage level, so that energy is sent to this battery supply., when the voltage level of the electric energy that is added to this battery supply is a bit larger tham the voltage level of this battery supply, be converted into heat energy corresponding to the pith of the electric energy of this voltage difference.

When the rechargeable battery power supply is implemented as the part of electronic equipment (as radiophone), be added to the heat energy that produces during the rechargeable battery power supply in charge power supply and cause this electronic equipment heating.The heating of electronic equipment may cause the user of this electronic equipment uncomfortable, also influences the performance of this equipment.

In view of the above, need a kind ofly in order to rechargeable battery is applied the device of charging now, described rechargeable battery is located in the electronic equipment, does not also produce excessive heat energy.

For this reason, the invention provides and to have overcome a kind of Apparatus for () and method therefor of problem above-mentioned in the prior art.

Its advantage of the present invention is also to provide a kind of electronic equipment that contains rechargeable power supply, wherein this electronic equipment can be connected with the power supply of a variable level, this power supply provides working power, with to this rechargeable power source charges, the present invention simultaneously also provides working power, so that the operation of the electronic circuit of this electronic equipment.

The present invention includes other advantage and characteristic, after having read present embodiment described in detail below, will be more clear.

For this reason, according to the present invention, disclose a kind of electronic equipment here, it is releasably connected on the power supply of variable level.The power supply of variable level has power control circuit, and the reception of power source-responsive control signal during its work is with the power level of control by the working power of variable level power supply generation.When the power supply Be Controlled of variable level, this electronic equipment operationally receives the working power that is produced by this variable level power supply.Connection Element comprises at least the first Connection Element and second Connection Element, allows releasably to be connected with the variable level power supply.First Connection Element allows the variable level power supply to receive on it, receives the working power that is produced by the variable level power supply.Second Connection Element allows the power control circuit of variable level power supply to be connected on it.Be connected with the charging signals that receives time response with rechargeable power supply, wherein the variable level power supply is connected with first Connection Element.In voltage sensing circuit when work, is in order to the voltage level of sensing rechargeable power supply with in order to produce the signal of the voltage level of representing institute's sensing.Represent the signal of this voltage level to form power control signal, so that be added on second Connection Element of this Connection Element and be added to again on the power control circuit of variable level power supply.In response to the voltage level of rechargeable power supply, the power level of the electric energy that is produced by this variable level power supply changes.

Read following description with reference to the following drawings and will understand the present invention better.

Fig. 1 illustrates typical battery charge curve, and wherein the voltage of measuring on the output at the secondary battery unit battery of rechargeable battery during the battery charge is to draw by the function of time;

Fig. 2 illustrates the block diagram of the electronic equipment of the preferred embodiment of the present invention that is connected with a variable level power supply;

Fig. 3 illustrates the block diagram of the radio receiving-transmitting unit of the preferred embodiments of the present invention that are connected with the variable level power supply that are similar to Fig. 2.

Fig. 4 illustrates the part block diagram of charging regulator and the sketch of partial circuit figure, the part of the electronic equipment of its pie graph 2 and Fig. 3 radio set;

Fig. 5 illustrates the schematic diagram of a cellular radiotelephone of the radio receiving-transmitting unit of the preferred embodiment of the present invention that is similar to Fig. 4;

Fig. 6 illustrates the flow chart of steps of the method for the preferred embodiments of the present invention.

As mentioned above, portable electric appts is often by rechargeable Power supply. When rechargeable power supply has exhausted the energy of storage, use battery charger to give the rechargeable primary cell charging of rechargeable power supply.

Can obtain now the structure of several battery chargers, so that this portable electric appts can be put together with entrained rechargeable power supply, this working power had both been supplied with the rechargeable secondary battery unit battery of this rechargeable power supply like this, also supplied with the circuit of this electronic equipment.

, because the power transfer between battery charger and this electronic equipment is not total efficiency, the part energy of the working power that is produced by this battery charger is converted into heat energy, and this heat energy makes the temperature rising of this electronic equipment. And when the voltage level of the working power that is produced by this battery charger was higher than the voltage level of galvanic cell of rechargeable power supply significantly, the major part of the working power that is produced by this battery charger was converted into heat energy. Accordingly, the temperature by the electronic equipment of this rechargeable power supply power supply raises significantly. In a concrete example, wherein this electronic equipment comprises a radiophone that is operated in the cellular communication system, and the working power that this battery charger produces changes heat energy into so that the temperature of this radiophone raises. The rising of this radiophone temperature can cause that the user of this radiophone is uncomfortable, also affects the performance of this radiophone.

Follow the tracks of the voltage level of the rechargeable secondary battery unit battery of this rechargeable power supply by the voltage level that makes the working power that battery charger produces, the amount of energy that is converted into working power heat energy, that produced by this battery charger reduces to minimum.

When this battery charger comprises the power supply of a variable level, need not be constant voltage level by the voltage level of the working power of this power generation. The voltage level of this working power is transformable, thereby has reduced the quantity of the energy that changes heat energy between the element cell charge period of this rechargeable power supply.

By the level-variable power supply that comprises this battery charger being provided the element cell level indication of this rechargeable power supply, this variable level power supply can carry out work to produce the working power of voltage level, this voltage level is corresponding to the voltage level that still is a bit larger tham the element cell of this rechargeable power supply, and producing heat at this between the element cell charge period can reduce.

As previously mentioned, the voltage level of the element cell of rechargeable power supply increases along with the increase of the quantity of the energy of this element cell storage during adding the work power supply to it.

Fig. 1 is the diagram of the typical battery charge curve of nickel-cadmium rechargeable primary cell.This battery charge curve constitutes as the function of time, the voltage curve measured on the output of nickel-cadmium rechargeable unit battery.

In Fig. 1, voltage is that the unit scale is drawn on the longitudinal axis 10 with the volt, and to be the unit scale with the second represent on transverse axis 12 time, result curve 14 usually in response to added working power so that increase in the time to the element cell charging.As shown in the figure, however general increase is not linear.The point 16 of curve 14 and the such voltage level of 17 representatives: the current level of the working power on these 2 element cells that are added to the rechargeable battery power supply changes.In beginning with in the drawings with the time durations of " quick charge stage " indication, the current level that is added to the working power of element cell is a quite high value.Then, with the time durations of " trick charge stage " (corresponding to the part between the point 16 and 17 of curve 14) expression, the current level that is added to the working power of element cell 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 these other types has the charging curve of further feature shape,, be correct generally speaking along with the increase voltage by the amount of energy of this battery storage generally increases.Under any circumstance, be added to the voltage of the working power of this element cell by making the level-variable power supply trace that comprises battery charger, the heat energy of generation has reduced.

Forward the block diagram of Fig. 2 below to, with the electronic equipment of the preferred embodiments of the present invention of label 20 expression releasably to be connected placement with variable level power supply 22.Variable level power supply 22 comprises that power control circuit 24 is as its part.Control circuit 24 work are with the voltage level of control by the working power of level-variable power supply 22 generations.

Variable level power supply 22 utilizes the

circuit

26 and 28 in

connector

34 and 40 to be connected to electronic equipment 20, the connectors of the inserted terminal representative that shown here is is represented by dotted lines, rectangle surrounds.Variable level power supply 22 can be received indoor power supply (utilizing connectors 42 to connect) or other suitable power source of a routine again.

Variable level power supply 22 is operated in the working power that produces any voltage level on the circuit 26.The circuit 46 that connects electronic equipment 22 receives the working power that is produced by power supply 22 with convenient power supply 22 on circuit 26 when connector 34 is received electronic equipment 20.Circuit 46 is received the electronic circuit 52 of electronic equipment 20 again, thereby provides working power to circuit 52 it to be worked.

Circuit 46 is also received charging regulator 58, and it is adjusted in the value of the working power that produces on the circuit 46.Produce the signal of an adjusting on the charging regulator 58 online 64, circuit 64 is received rechargeable battery power supply 70.Power supply 70 is made up of one or several rechargeable element cell.Connect by this, be added in the working power that produces by power supply 22 on the circuit 26 on the element cell of rechargeable battery power supply 70 its rechargeable unit battery charge.

It is chemical energy that the element cell of rechargeable battery power supply 70 changes by power supply 22 working power energy that produce and that regulated by charging regulator 58, and this chemical energy is stored in the element cell of rechargeable battery power supply.

Battery supply 70 utilizes circuit 72 to be connected to electronic circuit 52.When power supply 22 is not received electronic equipment 20 and when it provides working power, the stored energy of battery supply 70 is used for to circuit 52 power supplies, thereby electronic equipment 20 can be worked.But 52 power supplies have discharged the stored energy of battery supply 70 to circuit with the energy of battery supply 70 storage.In case the energy consumption of battery supply 70 storage is to being lower than to a certain degree, the element cell of this battery supply should add that charging current charges to it.

Control circuit 74 also constitutes the part of electronic equipment 20.Control circuit 74 utilizes circuit 76 to receive electronic circuit 52 and utilizes circuit 78 to receive charging regulator.

Voltage detecting circuit and temperature sensing circuit constitute the part of electronic equipment 20 in

addition.Circuit

82 and 84 be placed on rechargeable battery power supply 70 near, the voltage level and the temperature levels of rechargeable battery power supply 70 are measured in their work respectively.

Voltage detecting circuit 82 with the method work of routine so that for example measure the cell voltage level of power supply 70 by measuring voltage level on the output contact of power supply 70.

Temperature sensing circuit 84 is worked similarly in a usual manner, and for example can comprise a temperature sensor of placing near the element cell of battery supply 70.Therefore battery supply 70 replacedly comprises a temperature sensor, and as transducer 84, this transducer is placed on the inside of battery 70 boxes, and the indication of temperature range of the element cell of power supply 70 is provided.

Voltage sensing circuit 82 work and on circuit 86, produce the signal of the voltage level of pilot cell power supply 70.Similarly, temperature sensing circuit 84 work and on circuit 88, produce the signal of the temperature range of indication power supply 70.

Circuit

86 and 88 is connected to control electric wire 74 and the voltage level of battery supply 70 and the indication of temperature range is provided for this control circuit respectively.

When power supply 22 when connector 40 is received electronic equipment 20, the circuit 90 between circuit 86 and the connector 40 provides the signal of the voltage level of pilot cell power supply 70 for variable level power supply 22 by circuit 28.In this way, the indication of the voltage level of battery supply 70 offers power control circuit 24, and it controls the voltage level of the working power that is produced by battery 22 again.Thereby, depend on the voltage level of battery supply 70 at the voltage level of the working power that produces by power supply 22 on the circuit 26 and on circuit 46.Because at the conditioning signal that is produced by charging regulator 58 on the circuit 64 is relevant with the working power value that produces on circuit 46, the conditioning signal value that is added in battery supply 70 depends on the voltage level of the measurement of power supply 70.

Electronic equipment 20 comprises input unit 112, and this input unit 112 utilizes circuit 118 to receive electronic circuit 52.Similarly, the display unit 124 that for example comprises light-emitting diode is also received electronic equipment 52 by circuit 128.

The user of electronic equipment 20 is by suitable startup (as starting the on/off switch of several parts that can the comprise input unit 112) operating equipment 20 of input unit 112.The part work of electronic circuit 52 responds its input connecting circuit unit, when receiving equipment 20 by linkage unit 34, on circuit 46, receive the working power that produces by power supply 22, perhaps on circuit 70, receive the working power that produces by battery supply 70 similarly.When electronic circuit 52 work, indicate the signal of this work to offer control circuit 74 by circuit 76.

As previously mentioned, when the voltage level of the working power on the element cell that is added in rechargeable battery power supply (being power supply 70) here just is a bit larger tham the voltage level of this power subsystem battery, carry out the recharging of element cell of battery supply 70 most effectively.When the voltage level of the working power that produces when power supply 22 surpassed the voltage level of this battery supply significantly, the major part of this working power was changed into heat energy.This heat energy makes electronic equipment 20 heatings.But, follow the tracks of the voltage level of this battery power unit battery by the voltage level that makes the working power that produces by power supply 22, reduce working power and changed heat energy into.(in a preferred embodiment of the invention, approximately the voltage level than the element cell of this battery supply is high one volt for the voltage level that makes the working battery that is produced by power supply 22.）

Forwarding the block diagram of Fig. 3 below to, show the radio receiving-transmitting unit of the preferred embodiment of the present invention, here is a radiophone, usually with label 220 expressions.Radiophone 220 is corresponding to the electronic equipment 20 of Fig. 2.Level-variable power supply 222 is releasably received radiophone 220 and is comprised as its a part of power control circuit 224.

Level-variable power supply 222 can be received radiophone 220 by the circuit 226 and 228 that is connected to

connector

234 and 240, and this connector is expressed as connectors here, to be placed on the inserted terminal representative in the rectangle shown in the dotted line.Level-variable power supply 222 can be received the domestic power supply (connecting by connectors 242) of a routine again or receive the power supply of automobile.Power supply 222 is operated in the working power that produces the voltage level that requires on the circuit 226.

The circuit 246 interconnection connectors 234 of radiophone 220 and the transceiver circuitry of radiophone 220 here are expressed as and comprise receiver circuit part 250 and transmitter circuitry part 252.When power supply 222 was received the connector 234 of radiophone 220, the working power that is produced by power supply 222 was added to Receiver And

Transmitter circuit part

250 and 252, so that provide working power to operate circuit part separately for

circuit part

250 and 252.

Charging regulator 258 also constitutes the part of radiophone 220 and receives circuit 246, receives the working power that is produced by power supply 222 when power supply 220 is received connector 234 by circuit 226.Charging regulator 258 work are to be adjusted in the working power value that produces on the circuit 246 and to produce a conditioning signal on circuit 246, and this signal is added to rechargeable battery power supply 270 and makes its element cell charging.

Rechargeable battery power supply 270 is connected to Receiver And

Transmitter circuit part

250 and 252 by circuit 272.When variable level power supply 222 is not received radiophone 220, use the energy in the element cell that is stored in rechargeable battery power supply 270 that working power operation Receiver And Transmitter circuit part is provided.

Control circuit 274 utilizes circuit 276 to receive transmitter and

receiver circuit part

250 and 252 and utilize circuit 278 to receive charging regulator 258.

Voltage sensing circuit 282 and temperature sensing circuit 284 also constitute the part of radiophone 220.Voltage and

temperature sensing circuit

282 and 284

circuit

82 and 84 corresponding to Fig. 2.Voltage sensing circuit 282 work is so that at the signal that produces the voltage level that indication records on the circuit 286 on the element cell of battery supply 270, and temperature sensing circuit 284 work are so that produce the signal of temperature range of the element cell of pilot cell power supply 270 on circuit 288.Control circuit 274 is received

circuit

286 and 288 so that receive the signal that is produced by voltage sensing circuit 282 and temperature sensing circuit 284 respectively on

circuit

286 and 288 separately.

Circuit 290 is connected between circuit 286 and the connector 240, and when power supply 222 was received connector 240 by circuit 228, the signal of voltage level of element cell that pilot cell power supply 270 is provided was to level-variable power supply 222.Particularly, power control circuit 224 receives the signal of indication by the voltage level of the battery supply 270 of voltage sensing circuit 282 measurements.

Control circuit 224 work makes the voltage level of the working power that produced by power supply 222 in response to the voltage level change of the element cell of battery supply 270.In a preferred embodiment, control circuit 224 makes that the voltage level of the working power that produced by power supply 222 is than the about high one volt voltage level of the voltage level that records of the element cell of battery supply 270.The working power that is produced by power supply 222 is added to radiophone 220 by circuit 226, and this working power is by charging regulator 258 adjustings and add the element cell charging of the signal of adjusted to battery supply 270 on circuit 264.In this way, rechargeable battery power supply 270 can recharge effectively.

Also show radiophone 220 among the figure and comprise input unit, it receives Receiver And

Transmitter circuit part

250 and 252 by circuit 318.Similarly, display unit 324 is received

circuit part

250 and 252 by circuit 328.

Forward the part block diagram of Fig. 4, the sketch of partial circuit figure below to, a charging regulator is shown with label 358.Charging regulator 358 is similar to the charging regulator 58 of the electronic equipment 20 of the charging regulator 258 of radiophone 220 of Fig. 3 and Fig. 2.Corresponding on circuit 446, being added to charging regulator 358 by the power supply 222 of two figure in front and the working power of 22 working powers that produce.Charging control signal is added to charging regulator 358 on circuit 494, and it is to carry out to be similar to the method that produces the charging control signal of charging regulator 58 and 258 respectively on the

circuit

78 and 278 of Fig. 2 and 3.And producing conditioning signal to be similar to the method that produces conditioning signal on the

circuit

64 and 264 in Fig. 2 and 3 respectively on the circuit 464.

The signal that produces on circuit 446 is added to the source electrode of field effect transistor 504.The bushing of field effect transistor 504 is received the circuit 464 between resistance 510 and diode 516.

The comparator 524 that constitutes differential amplifier comprises a positive input terminal, the left side of receiving resistance 510 by resistance 530.The negative input end of comparator 524 is received the right side of resistance 510 by resistance 536.Shunt resistance 542 and 548 is received the positive and negative input of comparator 524 respectively.

Comparator 524 is producing the differential output signal of representing the difference between the signal that is added in its positive and negative input on the circuit 554.Because the signal that is added in the positive and negative input of comparator 524 is meant the voltage level that is shown in resistance 510 left sides and right side part, so the signal that produces on the circuit 554 be the voltage drop of representative on resistance 510 (and, because voltage and drain electrode is current related, so current related on the signal of generation on the circuit 554 and circuit 464).

Circuit 554 is received the positive input terminal of comparator 560.Comparator 560 also disposes and constitutes a differential amplifier.The charging control signal that produces on circuit 494 is added to many inputs of comparator 560.The differential output of the comparator 560 that produces on circuit 566 is added to the control utmost point of field effect transistor 504 by resistance 572.Shunt capacitance 578 further is connected between the control utmost point and ground of field effect transistor 504.The loop that forms between the drain electrode of field effect transistor 504 and the control utmost point thereof constitutes a feedback loop, it allows to be controlled on the circuit 464 electric current (and power level) of the signal that produces because be added in signal value that the control of field effect transistor 504 extremely goes up make field effect transistor 504 with method (being similar to the work of a valve) work of routine so that the current level of control drain electrode and circuit 464.And the control of the value of added charging control signal is added to the value of the signal of this control utmost point on circuit 494.Be directed at the signal that on circuit 464, produces in the suitable variation of the signal value that produces on the circuit 494 and have any required value.

The control circuit 74 of electronic equipment 20 and radiophone 220 and 274 work are so that the time that the element cell of definite power supply 70 separately and 270 charges fully.The determining unit battery charges fully and can carry out with several method.

In the first embodiment of the present invention, determine time ratio respectively by the element cell temperature range variation of

voltage detecting circuit

82 and 282 battery supplies of measuring.When the time ratio that changes surpassed first preset value,

control circuit

74 or 274 produced signal respectively on

circuit

78 or 278, and made charging regulator 58 and 258 make the conditioning signal that produces on

circuit

64 and 264 be reduced to first level that reduces respectively.When the time ratio that changes when the temperature value of element cell surpasses the second predetermined value,

control circuit

74 and 274 work are so that produce signal respectively on

circuit

78 and 278, making charging regulator 58 and 258 produce the signal of regulating respectively on

circuit

64 and 264 is second preset value.

In the second embodiment of the present invention,

control circuit

74 and 274 is with similar method work, but is in response to the temperature value (rather than its rate of change) of the element cell of battery supply 70 and 270.When measuring this temperature value greater than first preset value,

control circuit

74 and 274 produces signal respectively on

circuit

78 and 278, so that reduce the value by charging

regulator

64 and 264 signals that produce respectively, they are used to the element cell charging of power supply separately.

In the third embodiment of the present invention,

control circuit

74 and 274 is still worked in a similar fashion, but the voltage level of the element cell of the power supply 70 that response is measured respectively by

voltage sensing circuit

82 and 282 and 270.Consult the curve chart of Fig. 1, when the measuring voltage level of the element cell of

battery supply

70 or 270 surpassed level corresponding to the point 16 on the curve 14, it was first values that reduce that

control circuit

74 and 274 work make by charging regulator 58 and 258 signals that produce.And alarmmed when arriving second preset value then when the voltage level of the element cell of

power supply

70 and 270,

control circuit

74 and 274 makes charging regulator 58 and 258 produce the signal of the second minimizing value on

circuit

64 and 264 producing signal on

circuit

78 and 278.

Forward the sketch of Fig. 5 below to, it shows a radiophone with label 620 expressions.Radiophone 620 is corresponding to the radiophone 220 shown in the block diagram of Fig. 3.The casing of the radiophone 620 of Fig. 5 is put in each unit of the radiophone of representing with the square frame form among Fig. 3 220, but for rechargeable battery power supply 270, the battery pack 624 that comprises shown here.

Radiophone 620 is received variable level power supply 622 by

circuit

626 and 628, and circuit 626 is connected the connector of power supply 622 to radiophone 620 with 628 by connectors 630.(in the figure, the connector of radiophone 620 is blocked and cannot see, but corresponding to the

connector

234 and 240 of Fig. 3.) connectors 642 also is shown in the figure, power supply 626 can be received on the conventional domestic power supply.Though (connectors 642 comprises the connectors that can receive conventional domestic power supply, and other connectors that allows to receive other type of power certainly equally also is possible.）

Because power supply 622 is placed away from radiophone 620, but receives it by

circuit

626 and 628, the user is operate wireless telephone set 620 easily also, and no matter the connection between radiophone 620 and the power supply 622.Because the voltage level of the working power that is produced by power supply 622 is followed the tracks of the voltage level of this battery pack, thereby realized recharging of this battery cell effectively and the energy that do not surpass changes heat energy into.

Fig. 6 is the logical flow chart of step of listing this method of embodiments of the invention, label 800 expressions.When the level-variable power supply was received this radiophone, this method work to be receiving the working power that is produced by the variable level power supply, and this variable level power supply has the power control signal that response receives and the power control circuit of working.

At first, pointed as square frame 806, this variable level power supply is releasably received this radiophone.

Then, pointed as square frame 812, connect a rechargeable power supply to receive charging signals, this charging signals responds this variable level power supply and is connected so that the time of working power to this radiophone is provided.

Then, pointed as square frame 818, will offer transceiver circuitry by the working power of variable level power supply generation or the power supply that produces by the energy that rechargeable power supply is stored.

Then, pointed as square frame 824, the signal of the voltage level of rechargeable power supply is represented in generation.Represent the signal of this voltage level to constitute this power control signal and be added to the variable level power supply, and be added to the power control circuit of variable level power supply again, thereby make the voltage level change of the power level response rechargeable power supply of the power supply that produces by the variable level power supply.

Though the present invention narrates in conjunction with the embodiment shown in each figure, should understand, also can use other similar embodiment, and can retrofit and increase is used to carry out identical function of the present invention and does not depart from the present invention described embodiment.Therefore, the present invention is not limited in any single embodiment, but constitutes according to the range and the scope of the narration of claims.

Claims

1, a kind of electronic equipment is releasably received a variable level power supply, is used to receive the power supply that is produced by the variable level power supply when being connected with it, it is characterized in that described electronic equipment comprises:

A connector that can be connected with the variable level power supply, described connector comprise first connector of the power supply that reception is produced by the variable level power supply and second connector of a power control signal are provided for the level-variable power supply;

A rechargeable power supply is operationally received first connector so that receive power supply and operationally receive second connector so that the power control signal of the voltage level of this rechargeable power supply of indication is provided from this variable level power supply.

According to the electronic equipment of claim 1, it is characterized in that 2, this rechargeable power supply comprises a battery supply that is made of at least one secondary battery unit battery.

3, according to the electronic equipment of claim 1, it is characterized in that, also comprise electronic circuit, be operably connected alternately to receive one of power supply that produces by the power supply that produces at the level-variable power supply of first connector with by the energy of described rechargeable power supply storage.

According to the electronic equipment of claim 3, it is characterized in that 4, this electronic circuit comprises at least a portion of a radio receiving-transmitting unit.

According to the electronic equipment of claim 4, it is characterized in that 5, this radio receiving-transmitting unit comprises a radiophone.

6, according to the electronic equipment of claim 1, it is characterized in that, also comprise a charging regulator, operationally be connected between first connector and described rechargeable power supply of described connector, so that receive power supply and charge for described rechargeable power supply to regulate electric current from the power supply of variable level power supply by producing the charging signals of regulating from the variable level power supply.

7, according to the electronic equipment of claim 6, it is characterized in that, described charging regulator comprises a feedback control circuit, be operably connected so that receive the charging conditioning signal, and will represent signal and this charging conditioning signal of the electric current in the charging signals of regulating to compare so that regulate the electric current of power supply.

8, use to the method that rechargeable power supply charges, is characterized in that described method comprises step by the power supply of the variable level power supply generation that is connect:

(a) reception is added on the rechargeable power supply this rechargeable power supply charging by the power supply of variable level power supply generation with this power supply; With

(b) provide the power control signal of the voltage level of indicating this rechargeable power supply to the variable level power supply.

9, method according to Claim 8 is characterized in that, described step (b) comprises that the voltage level according to this rechargeable power supply provides (b1) step by step of power control signal.

10, method according to Claim 8 is characterized in that, comprises that also step (c) charging adjusting is used for recharging of this rechargeable power supply from the electric current of the power supply of variable level power supply and the charging signals of an adjusting of generation.