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Single Cell Systems Overview
Single Cell Systems Overview
Single Cell Systems Overview
Single Cell Systems Overview
Single Cell Systems Overview
Single Cell Systems Overview
Input Considerations
Input Considerations
Adapter Power Limits
Adapter Power Limits
Voltage Input Dynamic Power Management (VINDPM)
Voltage Input Dynamic Power Management (VINDPM)
Voltage Input Dynamic Power Management (VINDPM)
Voltage Input Dynamic Power Management (VINDPM)
VINDPM and DPPM working together
VINDPM and DPPM working together
Factors affecting thermal performance (effects on
Factors affecting thermal performance (effects on
Product Thickness and Battery Size: Smartphones
Product Thickness and Battery Size: Smartphones
Product Thickness and Battery Size: Smartphones
Product Thickness and Battery Size: Smartphones
Working around tradeoffs…
Working around tradeoffs…
Working around tradeoffs…
Working around tradeoffs…
Working around tradeoffs…
Working around tradeoffs…
Charge Cycle
Charge Cycle
Charge Time Optimizer in Action – bq2426x
Charge Time Optimizer in Action – bq2426x
Extending Run Time on Power Path Chargers
Extending Run Time on Power Path Chargers
Extending Run Time on Power Path Chargers
Extending Run Time on Power Path Chargers
Extending Run Time on Power Path Chargers
Extending Run Time on Power Path Chargers
Questions
Questions
Картинки из презентации «Battery Charger Design (1S): Key considerations and system design limitations» к уроку английского языка на тему «Без темы»

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Battery Charger Design (1S): Key considerations and system design limitations

содержание презентации «Battery Charger Design (1S): Key considerations and system design limitations.pptx»
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1Battery Charger Design (1S): Key 101A). ISYS=0.5A. IIN?1A. IBAT=0.5A. 10.
considerations and system design 11Dynamic Power-Path Management (DPPM).
limitations. Miguel Aguirre October, 2012. Function that monitors the input current,
1. input voltage and output currents of a
2Agenda. Single Cell Charger Systems Power-Path device and automatically gives
Input Considerations and Limitations priority to the system when the adapter
Topology Options Pros & Cons of Power can not support the system load See
Path Architecture Thermal Issues Market following example of DPPM function in a
Trends Needs vs. Limitations Charge Time linear charger. Same principle allies for
Optimizer Summary and Questions. 2. switching chargers. Assume 5W adapter (5V,
3Single Cell Systems Overview. Single 1A). ISYS=0.8A. IIN?1A. IBAT=0.2A. 11.
Cell Most Common Solution for Smartphones 12VINDPM and DPPM working together. VIN
(1s) and Tablets (1sXp) today Allows for 5V Adapter rated for 750mA. IIN. VSYS.
simple, low voltage design on the system IBAT. ISYS. Adapter Voltage Falls due to
(Max Battery Voltage 4.35V on some lithium Adapter Current Limit. Input Current
based chemistries) Simple design to charge Reduced by VINDPM function to Prevent
from a 5V supply as the charger will Adapter from Crashing. 750mA Charging.
always operate in step down mode Multiple 750mA Charging. Supplement Mode. 1.2A Load
cells in parallel allow for longer run Step.
times due to extra capacity This will 13Does VINDPM = DPPM? No. VINDPM
require a higher charge currents to prevents the adapter from hitting a
maintain an acceptable charge time. Charge “brown-out” condition. However, the
current will be a function of the current charger will not know how much current is
capability of the adapter. 3. going to the system and how much current
4Input Considerations. How many input is going to the battery. A charger can
connectors will the device have? Single have VINDPM and not have Power-path (DPPM)
Input (i.e. Micro-USB, Proprietary Charge current and system current is
Connector) Multiple Inputs (i.e. Micro-USB combined and the charger does not know how
and Dock Connector) How many input sources much current is being delivered only to
will the product support? USB charging the battery DPPM allows the charger to
only (Max current: 500mA for USB2.0, 900mA know exactly how much current is going to
for USB3.0) USB charging and/or adapter the battery. With this information, the
into single port For Micro-USB port, charger can reduce the charge current and
maximum current supported by adapter is extend the charging safety timer in the
1.8A USB specifies maximum current of 1.5A even the system demands higher currents
With a limit on the current, changing the Which one is better? Both topologies allow
input voltage allows you to increase your to charge the battery. Non DPPM chargers
output current USB Power Delivery (USBPD) will require the host to measure exactly
will allow for more power available for how much current goes to the battery for
charge solutions. Output current change proper termination. 13.
based on input voltage (assume 90% 14Thermal Regulation and Protection
efficiency and 3.6V Battery). 4. Loops. Thermal management functions:
5Adapter Power Limits. Adapter Power Regulate IC junction temperature by
Limits Today Most Smartphones: 5W – 8W reducing charge current , AND Turn off the
Most Popular Tablets: 10W – 15W. 5. charger when IC junction temperature is
6Current Capabilities of Adapters. excessive Slow down the safety timers when
Power sources have their limits There are the charge current is reduced by the
situations where the input power source thermal loop, avoiding a false safety
does not have enough power to supply what timer fault Common implementations: The IC
the portable device demands Becoming junction temperature is regulated to a
increasingly important with the value just below the maximum operating
standardization of input connectors such junction temperature, 1250C typical The
as the Micro-USB Input current limits and charger is turned off when the Charger IC
Input Voltage Dynamic Power Management junction temperature is excessive, 1500C
(VINDPM) provide the functions needed to typical. PLOSS = (VIN – VBAT) * ICHG. 14.
solve this problem. 6. 15Factors affecting thermal performance
7Voltage Input Dynamic Power Management (effects on ?JA). Case Study: Thermal
(VINDPM). Utilizing full capacity of Effect of PCB design on ?JA Device Size:
adapter – VIN Dynamic Power Management 2.1mm x 2mm, WCSP High K board (no vias),
(VINDPM) Loop continuously monitoring the ?JA = 69 C/W Using 2x2 vias, ?JA = 45.4
input voltage to the charger Without C/W. EIA/JESD 51-1 Standard. 15.
VINDPM the device can enter a hiccup mode 16Product Thickness and Battery Size:
between power up and “brown-out” condition Smartphones. HTC One X: 1800mAh, 8.9mm
When input voltage drops, device will Samsung Galaxy S3: 2100mAh, 8.6mm Samsung
limit the input current. Device hits Galaxy Note: 2500mAh, 10.1mm. HTC One X
VINDPM threshold and input current is Battery ? 4.4mm thick Galaxy S3 Battery ?
reduced. 7. 5mm thick Galaxy Note Battery ? 6mm thick.
8Voltage Input Dynamic Power Management Source: TechInsights Teardowns (web).
(VINDPM). Utilizing full capacity of Programmed Charge current higher than
adapter – VIN Dynamic Power Management adapter capability. Device hits VINDPM
(VINDPM) Loop continuously monitoring the threshold and input current is reduced.
input voltage to the charger Without 16.
VINDPM the device can enter a hiccup mode 17Working around tradeoffs… Increasing
between power up and “brown-out” condition Battery Size ? Larger Charge Current
When input voltage drops, device will Decreasing product thickness ? Thinner
limit the input current. Programmed Charge Inductors ? Lower Charge Currents 2A – 3A
current higher than adapter capability. charge current provides sweet spot of
Device hits VINDPM threshold and input short charge times with acceptable
current is reduced. 8. inductor sizes Design for 1.5uH converter
9Power-path vs. Non Power-path stability. Tradeoff between efficiency and
Topologies. Non Power-Path Topology The inductor size Focus on charge time
system voltage is always equal to the improvements (i.e. Charge Time Optimizer
battery voltage No system startup for Feature). 3A Inductor 1.2mm height. 2A
deeply discharged batteries ICHARGE is Inductor 1.0mm height. 4A Inductor 2mm
always split between IBAT and ISYS ICHARGE height. 17.
must be programmed to the maximum charge 18Charge Cycle ? No CTO. 83mV Overlap
current for the battery cell If ISYS > Charge current reduces too early. 18.
Termination current, then termination will 19Charge Time Optimizer in Action –
not occur IBAT is reduced for any system bq2426x. Charge Time Optimizer Sharp
load Reduced charge current extends charge handoff of CC and CV. Approximately 6mV
time. Safety timers may expire overlap – Best in industry Reduces charge
prematurely. Power-Path Topology time! For ITERM = 50mA ? Total Charge Time
ICONVERTER is set to maximize the current ~4:30 hrs For ITERM = 250mA ? Total Charge
from the source. More available current to Time ~ 3:50 hrs For ITERM = 500mA
system and battery charging for faster (<0.1C) ? Total Charge Time ~ 3:10 hrs.
charge time IBAT is set independent of 19.
ICONVERTER For low system loads, 20Extending Run Time on Power Path
ICONVERTER is reduced to maintain proper Chargers. Only 11 m? Optional External FET
charge current IBAT is always known by Driver. 20.
charger Accurate termination current 21Summary. Charger solutions greater
Safety timer extended when charge current than 3A on smartphones increases the
is less than programmed value. ICONVERTER. thickness of the design. Thermal
ISYS. ICHARGE. ISYS. IBAT. IBAT. 9. management is a problem with charge
10Dynamic Power-Path Management (DPPM). currents greater than 3A. Not enough board
Function that monitors the input current, space to extract the heat generated on the
input voltage and output currents of a charger. Focus on reducing charge times
Power-Path device and automatically gives with Charge Time Optimizer on newer TI
priority to the system when the adapter chargers (bq2425x, bq2426x) Increasing run
can not support the system load See time by reducing battery discharge path
following example of DPPM function in a impedance (11 m? on bq2426x). 21.
linear charger. Same principle allies for 22Questions? 22.
switching chargers. Assume 5W adapter (5V,
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