CN108155708A - A kind of wearable electronic equipment power supply method and device - Google Patents
A kind of wearable electronic equipment power supply method and device Download PDFInfo
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- CN108155708A CN108155708A CN201810139635.8A CN201810139635A CN108155708A CN 108155708 A CN108155708 A CN 108155708A CN 201810139635 A CN201810139635 A CN 201810139635A CN 108155708 A CN108155708 A CN 108155708A
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- lithium battery
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004146 energy storage Methods 0.000 claims abstract description 40
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 39
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 39
- 239000003990 capacitor Substances 0.000 claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000009434 installation Methods 0.000 claims abstract description 15
- 230000005669 field effect Effects 0.000 claims description 37
- 239000004065 semiconductor Substances 0.000 claims description 37
- 230000005611 electricity Effects 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 9
- 229910001416 lithium ion Inorganic materials 0.000 description 9
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 206010063493 Premature ageing Diseases 0.000 description 1
- 208000032038 Premature aging Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- 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
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/342—The other DC source being a battery actively interacting with the first one, i.e. battery to battery charging
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of wearable electronic equipment power supply method and devices.For a kind of wearable electronic equipment of the present invention for electric installation, described device includes charging port, first switch circuit, quick charge module, second switch circuit, energy-storage module, current detection module and power supply detection port.A kind of wearable electronic equipment method of supplying power to, includes the following steps, step 1：Start to charge up management；Step 2：Start super capacitor individually to charge；Step 3：Start lithium battery individually to charge；Step 4:Start super capacitor to charge for lithium battery；Step 5：Into charging suspend mode.A kind of wearable electronic equipment method of supplying power to of the present invention and device, by the use of the capacitor of quick charged large capacity as main energy storage device, high-capacity lithium battery is assists energy storage device, and powered by the way of multi-mode to wearable electronic equipment, solve the problems, such as that wearable electronic equipment charging is slow and cruise duration is short.
Description
Technical field
The present invention relates to wearable electronic equipment field, especially a kind of wireless bluetooth device power supply method and device.
Background technology
As people are familiar with wearable electronic equipment, the wearable electronic equipments such as bluetooth headset, Intelligent bracelet are
Progress into people's daily life.During actual use, wearable electronic equipment power consumption is fast, and people often forget about again to fill
Electricity causes when needing using electronic equipment, usually can not normal use due to not enough power supply.In addition, wearable electronics
The time of equipment charge is generally up to a few hours, and the process of user's waiting facilities charging is very long, and user is allowed to feel too troublesome
And have to abandon using.Thus people are not fine for the consumption experience of wearable electronic equipment, in order to improve wearing
The cruising ability and quick charge capability of formula electronic equipment are badly in need of solving the problems, such as the power supply charge and discharge of wearable electronic equipment.
Invention content
In order to solve the above-mentioned technical problem, the object of the present invention is to provide a kind of wearable electronic equipment power supply method and dresses
It puts, for solving the problems, such as that wearable electronic equipment charging is slow and cruise duration is short.
The technical solution adopted in the present invention is：A kind of wearable electronic equipment supplies electric installation, and described device includes charging
Port, first switch circuit, quick charge module, second switch circuit, energy-storage module, current detection module and supply port；
The output terminal of the charging port is connect with the input terminal of first switch circuit；
The output terminal of the first switch circuit is connect with the input terminal of quick charge module；
The output terminal of the quick charge module is connect with the input terminal of second switch circuit；
The output terminal of the second switch circuit and the input terminal of energy-storage module connect；
The output terminal of the energy-storage module is connect with supply port；
The output terminal of the current detection module is connect with the input terminal of first switch circuit；
The output terminal of the current detection module is connect with the input terminal of second switch circuit；
The input terminal of the current detection module and the output terminal of energy-storage module connect.
Preferably, main control MCU is connected described for electric installation by supply port.
Preferably, the main control MCU can be the master control of arbitrary wearable electronic equipment, and the wearable electronic equipment can be with
It is bluetooth headset, smartwatch, Intelligent bracelet, intelligent shoe and intelligent glasses etc..
Preferably, it can be lithium ion battery and/or ion capacitance to assist energy storage device.
Preferably, the first switch circuit includes the first metal-oxide-semiconductor field effect transistor；The first switch circuit includes second
Metal-oxide-semiconductor field effect transistor；The quick charge module includes the first capacitance, the first inductance and diode；The energy-storage module includes auxiliary
Help energy storage device and second resistance；
The drain electrode of first metal-oxide-semiconductor field effect transistor and the anode of charging port connect；The source of first metal-oxide-semiconductor field effect transistor
Pole and the first inductance connection；
First inductance and the first capacitance connection；Tell the other end ground connection of the first capacitance；
The anode of the diode is connect with the source electrode of the first metal-oxide-semiconductor field effect transistor；The minus earth of the diode；
The anode for assisting energy storage device is connect with the drain electrode of the second metal-oxide-semiconductor field effect transistor；The energy storage device of assisting
Cathode is connect with second resistance；The other end ground connection of second resistance.
Preferably, first capacitance is super capacitor, for fast storage electric energy and provides electric energy to assisting accumulator
Part；First metal-oxide-semiconductor field effect transistor is used to be turned on and off quick-charging circuit；It is described to assist energy storage device for storing for future use
Electric energy.
Preferably, the first output terminal of the current detection module is connect with the grid of the first metal-oxide-semiconductor field effect transistor；The electricity
The second output terminal of stream detection module is connect with the grid of the second metal-oxide-semiconductor field effect transistor；The third output of the current detection module
Hold and assist the cathode connection of energy storage device.
Preferably, the current detection module includes sampling resistor and microcontroller, the sampling resistor with microcontroller
Input terminal connects.
A kind of wearable electronic equipment method of supplying power to, applied to the wearable electronic equipment for electric installation, the side
Method includes the following steps：
Step 1：Charging wire accesses, and system starts to charge up management；
Step 2：Judge lithium battery charged state；If lithium battery has been filled with, system enters charging suspend mode；If lithium battery
Underfill, system start super capacitor charge mode；
Step 3：Judge super capacitor charged state；When super capacitor is charged to preset value, system starts lithium battery charging
Pattern；When super capacitor underfill, but during charging wire disconnection, lithium battery charged state is judged, if lithium battery underfill and charging
Line is off, and system enters super capacitor for lithium battery charge mode；
Step 4:After system starts lithium battery charge mode, when lithium battery underfill, but during charging wire disconnection, system enters
Super capacitor charge mode；
Step 5：After system enters super capacitor charge mode, until super capacitor discharge off, system enters charging and stops
Sleep mode.
The beneficial effects of the invention are as follows：
The present invention is a kind of wearable electronic equipment method of supplying power to and device, utilizes the capacitance of quick charged large capacity
Device is as main energy storage device, and the lithium battery of large capacity low price is assists energy storage device, and given by the way of with multi-mode
Wearable electronic equipment is powered.Within the charging time of one minute or so, storage reaches the call usage time of 8 hours or so
Electricity can more provide the cruise duration up to several days.User can be allowed to wait during idle time simultaneously to be supplemented charging, allow user can
Instantaneous quick charge also can normally charge at a slow speed.
Description of the drawings
The specific embodiment of the present invention is described further below in conjunction with the accompanying drawings：
Fig. 1 is that the present invention is the structure diagram that a kind of wearable electronic equipment supplies electric installation；
Fig. 2 is that the present invention is the specific embodiment schematic diagram that a kind of wearable electronic equipment supplies electric installation；
Fig. 3 is that the present invention is the another specific embodiment schematic diagram that a kind of wearable electronic equipment supplies electric installation；
Fig. 4 is that the present invention is a kind of flow diagram of wearable electronic equipment method of supplying power to.
Specific embodiment
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.
A kind of wearable electronic equipment of the present embodiment supplies electric installation, and with reference to figure 1, device includes charging port, first switch
Circuit, quick charge module, second switch circuit, energy-storage module, current detection module and supply port.The output of charging port
End is connect with the input terminal of first switch circuit；The output terminal of first switch circuit is connect with the input terminal of quick charge module；
The output terminal of quick charge module is connect with the input terminal of second switch circuit；The output terminal and energy-storage module of second switch circuit
Input terminal connection；The output terminal of energy-storage module is connect with supply port；The output terminal of current detection module and first switch electricity
The input terminal connection on road；The output terminal of current detection module is connect with the input terminal of second switch circuit；Current detection module
The output terminal of input terminal and energy-storage module connects.
A kind of wearable electronic equipment supplies a specific embodiment of electric installation, and with reference to figure 2, first switch circuit includes first
Metal-oxide-semiconductor field effect transistor Q1；First switch circuit includes the second metal-oxide-semiconductor field effect transistor Q2；Quick charge module includes the first capacitance C1, the
One inductance L1 and diode；Energy-storage module includes assisting energy storage device BT1 and second resistance R2.
The drain electrode of first metal-oxide-semiconductor field effect transistor Q1 and the anode of charging port connect；The source electrode of first metal-oxide-semiconductor field effect transistor Q1 with
First inductance L1 connections；First inductance L1 is connect with the first capacitance C1；Tell the other end ground connection of the first capacitance C1；Diode L
Anode connect with the source electrode of the first metal-oxide-semiconductor field effect transistor Q1；The minus earth of diode L；Assist the anode of energy storage device BT1 with
The drain electrode connection of second metal-oxide-semiconductor field effect transistor Q2；The cathode for assisting energy storage device BT1 is connect with second resistance R2；Second resistance R2
The other end ground connection.
First capacitance C1 is super capacitor, for fast storage electric energy and provides electric energy and gives lithium ion battery BT1；First
Metal-oxide-semiconductor field effect transistor Q1 is used to be turned on and off quick-charging circuit；Lithium ion battery BT1 is used to store for future use electric energy.
First output terminal of current detection module is connect with the grid of the first metal-oxide-semiconductor field effect transistor Q1；Current detection module
Second output terminal is connect with the grid of the second metal-oxide-semiconductor field effect transistor Q2；The third output terminal of current detection module is with assisting accumulator
The cathode connection of part BT1.
The present embodiment wearable electronic equipment is for the operation principle of electric installation：
After first metal-oxide-semiconductor field effect transistor Q1 is linked into 5V power source charges port, current detection module is started to work, and is started to the
One capacitance C1 charges, while the second metal-oxide-semiconductor field effect transistor Q2 also begins to work, and battery charging is carried out to lithium ion battery BT1.First
After the completion of capacitance C1, lithium ion battery BT1 mechanical charges are expired to battery capacity.When inputting disconnection, the electricity on the first capacitance C1
Persistently it can charge to lithium ion battery BT1 and main control MCU is powered.
In some application scenarios, which avoids any modification of wearable electronic equipment main control chip, only needs
The process of quick charge and electric discharge is completed in one external power supply by the management of external current detection module.Specifically, it is electric
Stream detection module may include current detecting chip ACS712 and/or current detecting chip AD8217.
Further, which has different optimization under different application scenarios, to reach best using effect.
For example can also save the circuits such as the second metal-oxide-semiconductor field effect transistor Q2, lithium ion battery BT1, only use the part of quick charge and quick
Rechargeable battery reduces the applications such as cost.
As being further improved for scheme, with reference to figure 3, the another specific embodiment of the present embodiment.The device includes charging
Port, the first metal-oxide-semiconductor field effect transistor Q1, the first current-limiting resistance R1, first capacitance C1, DCDC charge power supply, the first inductance L1, second
Capacitance C2, energy storage device BT1, second resistance R2, main control MCU are assisted.
The grid of first metal-oxide-semiconductor field effect transistor Q1 and the output terminal of main control MCU connect；The source electrode of first metal-oxide-semiconductor field effect transistor Q1
It is connect with the anode of charging port；The drain electrode of first metal-oxide-semiconductor field effect transistor Q1 is connect with the first current-limiting resistance R1；First current-limiting resistance
The other end of R1 is connect with the first capacitance C1；The other end ground connection of first capacitance C1；The anode of DCDC charge power supplies and the first limit
Leakage resistance R1 connections；The cathode of DCDC charge power supplies is connect with the first inductance L1；The other end and the second capacitance of first inductance L1
C2 connections；The other end ground connection of second capacitance C2；The anode for assisting energy storage device BT1 is connect with the first inductance L1；Assist energy storage
The cathode of device BT1 is connect with second resistance R2；The other end ground connection of second resistance R2.
First output terminal of main control MCU is connect with the grid of the first metal-oxide-semiconductor field effect transistor Q1；
The second output terminal of main control MCU is connect with the anode of DCDC power modules；
The third output terminal of main control MCU is connect with assisting the cathode of energy storage device BT1.
Its operation principle is：When bluetooth headset is linked into charger, the main control MCU of bluetooth is activated.Main control MCU judges first
The voltage of capacitance C1 and the second capacitance C2 if the voltage of the second capacitance C2 is less than full voltage value, begin preparing for charging；If
Second capacitance C2 electricity is less than, preferentially starts to charge to the first capacitance C1, at this moment opens charging metal-oxide-semiconductor field effect transistor Q1, and monitoring is filled
The voltage of electric current and the second capacitance C2；5v super capacitors are used in the present embodiment, the mode for having plug-in is led to
It crosses the first current-limiting resistance R1 and carries out current limliting and control charging current, MOS are closed when charging current is more than preset current value
Effect pipe Q1, be delayed tens milliseconds after open metal-oxide-semiconductor field effect transistor Q1 again, discontinuously to the first capacitance C1 charge.It avoids just starting
When excessive electric current, charger is allowed to enter guard mode, equipment charge can not be given.
With reference to figure 4, Denso is supplied applied to the wearable electronic equipment for a kind of wearable electronic equipment method of supplying power to
It puts, the described method comprises the following steps：
Step 1：Charging wire accesses, and system starts to charge up management；
Step 2：Judge lithium battery charged state；If lithium battery has been filled with, system enters charging suspend mode；If lithium battery
Underfill, system start super capacitor charge mode；
Step 3：Judge super capacitor charged state；When super capacitor is charged to 80%, system starts lithium battery charging mould
Formula；When super capacitor underfill, but during charging wire disconnection, lithium battery charged state is judged, if lithium battery underfill and charging wire
It is off, system enters super capacitor for lithium battery charge mode；
Step 4:After system starts lithium battery charge mode, when lithium battery underfill, but during charging wire disconnection, system enters
Super capacitor charge mode；
Step 5：After system enters super capacitor charge mode, until super capacitor discharge off, system enters charging and stops
Sleep mode.
In the present embodiment, according to above-mentioned steps, first judge the state of lithium ion battery, confirm the pattern shape currently taken
State.Then start to carry out quick charge to super capacitor, when capacitance is charged to 80% situation, start to fill lithium battery
Electricity, lithium battery enter charging suspend mode after being full of.If off charging in the way of charging, then by the electricity of super capacitor after
Continue and charge to lithium battery.Until the electricity of capacitance be finished or lithium battery be full of enter suspend mode.
In the prior art, 5V-2A charging currents can fill the electric energy of 5v*2A/60=0.16Wh at one minute, if using 5V
It charging, in the case of the electron equipment of 3V power supplies, can about provide the electric energy of 45mah, the power consumption of Bluetooth headset is about 9MA,
The bluetooth conversation time of 5 hours or so can be provided in the case of the phone charger charging of standard.Under mixed charged pattern
Again using the lithium battery of large capacity low price as supplement electricity source, you can realize charging one minute, the reality of call 18 hours
It uses.
The capacity of super capacitor can be calculated by equation below：
Formula：F/V/3600=V AH
So：5V 1F=(5v-2v) * 1f/3V/3600=2.5mah
Operating voltages of the wherein 5v for capacitor, the minimum operating voltage of 2V chips, in 2V hereinafter, the inconvenient profit of voltage
With.So it is minimum operating voltage that the present embodiment, which chooses 2V,.If call by can be calculated work to be provided 1 hour or so
Need the capacitor of 4F or so.
In the present embodiment, worked together using lithium ion battery and super capacitor.If super capacitor class energy storage is used completely
Device, due to the limitation of bluetooth headset volume, usage time will compare short.It can be reduced using the mode of hybrid power supply
Cost offers convenience to using.Using super capacitor, quick high-multiplying-power battery does quick charge, meets 1 to 2 hours of user
Emergency use, be further continued for after the completion of use charging lithium battery is full of.It can both charge at any time repeatedly in this way, and can be with
More days of the use of long-life avoids the premature aging during the use of frequent charge and discharge of common 2 primary cell.It is in addition, super
The self discharge of grade capacitance is bigger, and in standby mode, general several days time capacitances are given out light electric energy with regard to self discharge, pass through this group
The mode of conjunction slowly charges the electric energy of capacitance to common lithium battery in standby mode, the electric energy of capacitances is waited to use
Afterwards, lithium battery power supply is switched to, such stand-by time can accomplish more than half a year, avoid the problem of stand-by time is short.
It is that the preferable of the present invention is implemented to be illustrated, but the invention is not limited to the implementation above
Example, those skilled in the art can also make various equivalent variations under the premise of without prejudice to spirit of the invention or replace
It changes, these equivalent deformations or replacement are all contained in the application claim limited range.
Claims (6)
1. a kind of wearable electronic equipment supplies electric installation, which is characterized in that described device includes charging port, first switch electricity
Road, quick charge module, second switch circuit, energy-storage module, current detection module and supply port；
The output terminal of the charging port is connect with the input terminal of first switch circuit；
The output terminal of the first switch circuit is connect with the input terminal of quick charge module；
The output terminal of the quick charge module is connect with the input terminal of second switch circuit；
The output terminal of the second switch circuit and the input terminal of energy-storage module connect；
The output terminal of the energy-storage module is connect with supply port；
The output terminal of the current detection module is connect with the input terminal of first switch circuit；
The output terminal of the current detection module is connect with the input terminal of second switch circuit；
The input terminal of the current detection module and the output terminal of energy-storage module connect.
2. a kind of wearable electronic equipment according to claim 1 supplies electric installation, which is characterized in that the first switch electricity
Road includes the first metal-oxide-semiconductor field effect transistor；The first switch circuit includes the second metal-oxide-semiconductor field effect transistor；The quick charge module packet
Include the first capacitance, the first inductance and diode；The energy-storage module includes assisting energy storage device and second resistance；
The drain electrode of first metal-oxide-semiconductor field effect transistor and the anode of charging port connect；The source electrode of first metal-oxide-semiconductor field effect transistor with
First inductance connection；
First inductance and the first capacitance connection；Tell the other end ground connection of the first capacitance；
The anode of the diode is connect with the source electrode of the first metal-oxide-semiconductor field effect transistor；The minus earth of the diode；
The anode for assisting energy storage device is connect with the drain electrode of the second metal-oxide-semiconductor field effect transistor；The cathode for assisting energy storage device
It is connect with second resistance；The other end ground connection of second resistance.
3. a kind of wearable electronic equipment according to claim 2 supplies electric installation, which is characterized in that first capacitance is
Super capacitor for fast storage electric energy and provides electric energy to assisting energy storage device；
First metal-oxide-semiconductor field effect transistor is used to be turned on and off quick-charging circuit；
It is described to assist energy storage device for storing for future use electric energy.
4. a kind of wearable electronic equipment according to claim 2 supplies electric installation, which is characterized in that the current detecting mould
First output terminal of block is connect with the grid of the first metal-oxide-semiconductor field effect transistor；The second output terminal of the current detection module and second
The grid connection of metal-oxide-semiconductor field effect transistor；The third output terminal of the current detection module is connect with assisting the cathode of energy storage device.
5. a kind of wearable electronic equipment according to claim 1 supplies electric installation, which is characterized in that the current detecting mould
Block includes sampling resistor and microcontroller, and the sampling resistor is connect with the input terminal of microcontroller.
6. a kind of wearable electronic equipment method of supplying power to, which is characterized in that it the described method comprises the following steps,
Step 1：Charging wire accesses, and system starts to charge up management；
Step 2：Judge lithium battery charged state；If lithium battery has been filled with, system enters charging suspend mode；If lithium battery underfill,
System starts super capacitor and individually charges；
Step 3：Judge super capacitor charged state；When super capacitor is charged to preset value, system starts lithium battery and individually charges；
When super capacitor underfill, but when charging wire disconnects, lithium battery charged state is judged, if lithium battery underfill and charging wire is in
Off-state, system start super capacitor and charge for lithium battery；
Step 4:After system starts the independent charging of lithium battery, when lithium battery underfill, but during charging wire disconnection, system starts super
Capacitance individually charges；
Step 5：After system enters super capacitor charge mode, until super capacitor discharge off, system enters charging suspend mode.
Priority Applications (1)
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| CN201810139635.8A CN108155708A (en) | 2018-02-11 | 2018-02-11 | A kind of wearable electronic equipment power supply method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112688383A (en) * | 2020-12-15 | 2021-04-20 | 维沃移动通信有限公司 | Power supply control circuit, power supply control method and device and electronic equipment |
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| CN106505726A (en) * | 2016-12-20 | 2017-03-15 | 东北电力大学 | Based on battery and the DC UPS of super capacitor |
| CN107040019A (en) * | 2017-04-19 | 2017-08-11 | 广州志正电气有限公司 | A kind of lithium battery quick charge device and charging method |
| CN207896718U (en) * | 2018-02-11 | 2018-09-21 | 深圳市富登科技有限公司 | A kind of wearable electronic equipment is for electric installation |
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| CN112688383A (en) * | 2020-12-15 | 2021-04-20 | 维沃移动通信有限公司 | Power supply control circuit, power supply control method and device and electronic equipment |
| CN112688383B (en) * | 2020-12-15 | 2023-06-20 | 维沃移动通信有限公司 | Power supply control circuit, power supply control method and device and electronic equipment |
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