Transcript 4035.High-voltage-charger-solution

High voltage charger solution
Li, Wang: [email protected]
MGambrill, Michael: [email protected]
Liang, Roger: [email protected]
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Abstract
•
A typical bq24610 Application
•
A high voltage charger block diagram
•
Test results
•
More higher input voltage solution
•
SMBus high voltage charger solution
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A typical bq24610 Application
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3
A Typical standalone charger application circuit
Q1
Adapter
R16
2Ω
C11
VCC
0.1µF ACN
ACP bq24610
ACDRV
VREF
BATDRV
C12
CE
1µF
REGN
ISET1
C1
2.2µF
R9
9.31kΩ
R3
100kΩ
R5
100kΩ
R7
100kΩ
ISET2
Pack
Thermistor
R10
430kΩ
SYSTEM LOAD
RAC: 10m
Q2
10
Power
Source
Q3
Selector
C7
0.1uF
C5:1µF
BTST
C4
10uF
Q4
ACSET
HIDRV
TS
R4
95.3kΩ
R6
22.1kΩ
R8
57.6kΩ
C17
0.22µF
TTC
STAT1
R12:10kΩ
STAT2
R13:10kΩ
PG
SRP
SRN
RSR
10m
Q5
C7
10µF
LODRV
GND
R11:10kΩ
bq24610: 600kHz, Li-Ion
4x4mm QFN-24
L: 6.8µH
PH
Adapter
C3
10µF
C2
10µF
C10
0.1µF
VFB
Typical 1-6 Li-Ion Cells, VIN max: 28V
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Battery Pack
C8
10µF
R1
953kΩ
C9
100pF
R2
105kΩ
Optional section divider or presentation
title High
slide voltage charger block diagram
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5
8-cell Li-ion battery charger
•Basic requirements:
Output: if 4.2V/cell battery, the output
voltage setting needs 4.2Vx8=33.6V.
Input: Vin > 33.6V+few volt hysteresis
A typical bq24610/30 application circuit can
not accept the input voltage higher than 32V
(Input OVP setting).
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Modified Charger Block Diagram
The charger circuit have to do several modifications.
The block diagram of HPA603 EVM:
DC Input
Vcc Bias
Supply
TPS54060
35~57V
8~14V Vcc
ACN
ACP
CE
ACDRV
CE
VCC
Pre-charge
Deeply discharged
Battery
BATDRV
BTST
setting
REGN
VREF
Vcc
BTST
ISET1
ISET2
Pack
Thermistor
ACSET
HIDRV
PH
TS
TTC
Half Bridge
Gate
Drive
UCC27201
LODRV
GND
Vcc
Q1
STAT1
Q2
Buffer
LM358
bq24610/30
VFB
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C
VREF
Rs
SRP
SRN
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Battery Pack
Rsns
Current
Sense
INA169
STAT2
PG
L
2~3V
Clamp
VCC bias supply solution
Function block: Vcc Bias supply
It powers the charger IC-bq24610/30, external half
bridge gate driver, current sense circuit and OMAMP
buffer. And it is also used for charging up a deeply
discharged battery. A switching Vcc bias power
supply needs:
• Operating from the maximum input voltage
• An 8-14 V output voltage: It is set by the external
half bridge gate driver requirement
• At least 200mA: It is derived from the sum of the
charging current for deeply discharged battery
and the whole board current consumption.
For 60V input, the TPS54060 is selected to meet these
three requirements.
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Modified Charger Block Diagram
Half bridge gate drive solution
DC Input
Vcc Bias
Supply
TPS54060
35~57V
8~14V Vcc
ACN
ACP
CE
ACDRV
CE
VCC
Pre-charge
Deeply discharged
Battery
BATDRV
BTST
setting
REGN
VREF
Vcc
BTST
ISET1
HIDRV
ISET2
Pack
Thermistor
ACSET
PH
TS
TTC
Half Bridge
Gate
Drive
UCC27201
LODRV
GND
Vcc
Q1
STAT1
Q2
Buffer
LM358
bq24610/30
VFB
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C
VREF
Rs
SRP
SRN
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Battery Pack
Rsns
Current
Sense
INA169
STAT2
PG
L
2~3V
Clamp
Half bridge gate drive solution
Function block: Half Bridge Gate Drive
It receives the charger IC HIDRV and LODRV signal and drive the buck FET
Q5 and Q6. The half bridge gate drive needs:
• 20% input voltage margin
• Have two Complementary inputs to match HIDRV and LODRV output
of bq24610.
• Input logic high threshold need lower than 3V match the voltage level
of bq24610/30’s HIDRV and LODRV output.
• Reserve several resistors, caps and diode to adjust turn-on&off
speed and dead time
For 60V input, the UCC27201 is selected to meet these three requirements.
bq24610
R13
D3
HIDRV
PH
LODRV
PGND
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Vcc
HI VDD HB
C21 UCC
UCC HO
27201
27201 HS
C22 LI
VSS LO
R14
D4
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Cin
R25
Q1
Q2
R26
Modified Charger Block Diagram
Current sense solution
DC Input
Vcc Bias
Supply
TPS54060
35~57V
8~14V Vcc
ACN
ACP
CE
ACDRV
CE
VCC
Pre-charge
Deeply discharged
Battery
BATDRV
BTST
setting
REGN
VREF
Vcc
BTST
ISET1
HIDRV
ISET2
Pack
Thermistor
ACSET
PH
TS
TTC
Half Bridge
Gate
Drive
UCC27201
LODRV
GND
Vcc
Q1
STAT1
Q2
Buffer
LM358
bq24610/30
VFB
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C
VREF
Rs
SRP
SRN
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Battery Pack
Rsns
Current
Sense
INA169
STAT2
PG
L
2~3V
Clamp
Current sense solution
Function block: Current sense
It is a high voltage bus current sensor or a current
mirror circuit. It needs
• Set 1:1 ratio between Rsns Voltage and Rs voltage.
For battery voltage is upto 60V, the INA169 is selected
to meet that requirement.
Rsns
Current sense
Rs
(R6)
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1k
1k
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Modified Charger Block Diagram
buffer solution
DC Input
Vcc Bias
Supply
TPS54060
35~57V
8~14V Vcc
ACN
ACP
CE
ACDRV
CE
VCC
Pre-charge
Deeply discharged
Battery
BATDRV
BTST
setting
REGN
VREF
Vcc
BTST
ISET1
HIDRV
ISET2
Pack
Thermistor
ACSET
PH
TS
TTC
Half Bridge
Gate
Drive
UCC27201
LODRV
GND
Vcc
Q1
STAT1
Q2
Buffer
LM358
bq24610/30
VFB
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C
VREF
Rs
SRP
SRN
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Battery Pack
Rsns
Current
Sense
INA169
STAT2
PG
L
2~3V
Clamp
Current sense buffer solution
Function block: Buffer
The SRP/SRN pin of charge IC has few milliampere
sink current. The current sense output may not
have enough current capability. The buffer circuit
needs:
• Keep the output voltage on SRP/SRN pin is same
as Rs voltage
• Provides enough current (8mA) to drive SRP/SRN
pin.
The LM358 is selected to meet these two requirements.
U1
bq24610
L
Buffer
U5:LM358
Rs
(R6)
SRP
SRN
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R3
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Rsns
Current
sense
Modified Charger Block Diagram
2~3V clamp circuit solution
DC Input
Vcc Bias
Supply
TPS54060
35~57V
8~14V Vcc
ACN
ACP
CE
ACDRV
CE
VCC
Pre-charge
Deeply discharged
Battery
BATDRV
BTST
setting
REGN
VREF
Vcc
BTST
ISET1
HIDRV
ISET2
Pack
Thermistor
ACSET
PH
TS
TTC
Half Bridge
Gate
Drive
UCC27201
LODRV
GND
Vcc
Q1
STAT1
Q2
Buffer
LM358
bq24610/30
VFB
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C
VREF
Rs
SRP
SRN
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Battery Pack
Rsns
Current
Sense
INA169
STAT2
PG
L
2~3V
Clamp
2~3V clamp circuit solution
Function block: 2~3v Clamp circuit
If the SRP/SRN pin voltage is lower than 2V, the IC
runs at a short protection mode. The low side
MOSFET is held off at that mode. The clamp circuit
needs:
• Voltage is between 2~3V.
• Can absorb the Rs current
• Can support SRN pin sink current (8mA)
A simple 2~3V clamp circuit can be created from the
bq24610’s 3.3V VREF.
L
Rsns
bq24610
Rs
(R6)
Current
sense
SRN
VREF
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R27
VREF
C30
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Modified Charger Block Diagram
BTST setting
DC Input
Vcc Bias
Supply
TPS54060
35~57V
8~14V Vcc
ACN
ACP
CE
ACDRV
CE
VCC
Pre-charge
Deeply discharged
Battery
BATDRV
BTST
setting
REGN
VREF
Vcc
BTST
ISET1
HIDRV
ISET2
Pack
Thermistor
ACSET
PH
TS
TTC
Half Bridge
Gate
Drive
UCC27201
LODRV
GND
Vcc
Q1
STAT1
Q2
Buffer
LM358
bq24610/30
VFB
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C
VREF
Rs
SRP
SRN
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Battery Pack
Rsns
Current
Sense
INA169
STAT2
PG
L
2~3V
Clamp
BTST setting
Function block: BTST setting
To isolate PH, HIDRV and BTST pin. The PH pin is connected
to ground. BTST voltage needs:
• Higher than 3V to keep correct gate logic.
• Lower than 4V to keep LODRV send refresh pulse every
switching cycle. External half bridge gate will use that
LODRV refresh pulse to charge its bootstrap cap.
A simply resistor divider from 6V REGN can set the BTST voltage easily.
bq24610
R22
REGN
BTST
R21
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C16
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Modified Charger Block Diagram
BTST setting
DC Input
Vcc Bias
Supply
TPS54060
35~57V
8~14V Vcc
ACN
ACP
CE
ACDRV
CE
VCC
Pre-charge
Deeply discharged
Battery
BATDRV
BTST
setting
REGN
VREF
Vcc
BTST
ISET1
HIDRV
ISET2
Pack
Thermistor
ACSET
PH
TS
TTC
Half Bridge
Gate
Drive
UCC27201
LODRV
GND
Vcc
Q1
STAT1
Q2
Buffer
LM358
bq24610/30
VFB
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C
VREF
Rs
SRP
SRN
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Battery Pack
Rsns
Current
Sense
INA169
STAT2
PG
L
2~3V
Clamp
Pre-condition deeply discharge battery solution
Function block: Pre-condition deeply discharge battery
When battery voltage is deeply discharged lower than 3V, the current sense circuit
can not work properly. The pre-condition circuit needs:
• The pre-condition current can bring a deeply discharged battery
voltage higher than 3V.
• The pre-condition current is lower than bias supply output
capability.
A simply resistor (R46 and R47) and diode (D8) pre-charge path can pre-charge the
battery voltage up to the 3V that is a minimum operating voltage range of the
current sense circuit. A comparator compares the battery voltage with 3.3Vref. If
the battery voltage is higher than 3.3V, the CE is pulled to high and charger is
enabled.
TPS54060
VCC bias
supply
R46
D8
R47
BAT
R10
VREF
D7
R31
CE
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LM2903
VREF
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The calculation tool of L, C value and other
parameters
The calculation tool of L, C value and other
parameters can be found in
http://www.ti.com/litv/zip/sluc175c
Battery charge voltage setting
Battery pre-charge/termination current setting
Battery fast-charge current setting
Iripple_Lout_Vripple
LC output filter resonant frequency
Fast charge timer
TS resistor network
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EVM and Application note information
The high voltage charge EVM (HPA603) and
user’s guide (SLUU447) are available.
Application notes (SLUA580) is released: A
practical high voltage charger solution with
existing bq24610 charger IC.
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Test Results on HPA603 EVM
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23
Test result on HPA603 EVM
• 1 ISET1 control IBAT
– 1.1 ISET1 vs IBAT waveform
– 1.2 ISET1 transient
– 1.3 ISET1 accuracy
• 2 Switching waveforms
• 3 Charger start-up or shut-down with CE control
• 4 Battery insertion and removal
• 5 soft start
• 6 efficiency
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Modified Charger Block Diagram
The charger circuit have to do several modifications.
The block diagram of HPA603 EVM:
DC Input
Vcc Bias
Supply
TPS54060
35~57V
8~14V Vcc
ACN
ACP
CE
ACDRV
CE
VCC
Pre-charge
Deeply discharged
Battery
BATDRV
BTST
setting
REGN
VREF
Vcc
BTST
ISET1
ISET2
Pack
Thermistor
ACSET
HIDRV
PH
TS
TTC
Half Bridge
Gate
Drive
UCC27201
LODRV
GND
Vcc
Q1
STAT1
Q2
Buffer
LM358
bq24610/30
VFB
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C
VREF
Rs
SRP
SRN
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Battery Pack
Rsns
Current
Sense
INA169
STAT2
PG
L
2~3V
Clamp
1.1 ISET1 vs IBAT waveform
IBAT
ISET1
• IBAT are proportional to ISET1. The ratio follows the
datasheet equation.
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1.2 ISET1 transient 2
• ISET1 from 1V to 2V （CCM）
IBAT
ISET1
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1.3 ISET1 accuracy
ISET1 vs Vsns
16
14
Vsns error (%)
12
10
8
Series1
6
4
2
0
0
0.5
1
1.5
ISET1 (V)
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2
2.5
2 Switching waveforms
High side gate
High side gate
Switching node
Inductor current
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3. Charger start-up or shut-down with CE control
VBAT
CE
Switching node
Inductor current
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4 Battery removal and insertion
VBAT
VIN
Switching node
Inductor current
Ch1 (yellow): Vin
Ch2 (blue): Vbat
Ch3 (pink): PH
4 (green): IL
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5 soft start
VBAT
VIN
Switching node
Inductor current
Ch1 (yellow): Vin; Ch2 (blue): Vbat; Ch3 (pink): PH; ch4 (green): IL
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6 efficiency
Efficiency and power dissipation
100.0%
8
90.0%
7
80.0%
Efficiency
5
60.0%
50.0%
4
40.0%
3
48Vin; 30Vbat
30.0%
2
power dissipation
20.0%
1
10.0%
0.0%
0
0
1
2
3
4
Charging current (A)
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5
6
Power dissipation (W)
6
70.0%
More Higher input voltage charger:
100Vin_max and 16-cell
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34
Higher input range solution
If need a even high voltage, for example: 16 cell battery charger with 80V input.
Please update those components and circuits:
Output
Input
bq24610EVM
(HPA603EVM)
8-cell Li-ion battery
8x4.2=33.6V
Maximum 60V input
80Vin/16cell
Li-ion battery Charger
16-cell Li-ion battery
16x4.2=67.2V
Maximum 100V input
Changer requirement
VCC bias supply
Current sense
circuit
R23
(Vbat
setting)
L1 value
(Keep ΔI
constant)
Power
FET
bq24610EVM
(HPA603EVM)
TPS54060
INA169
R23:
464k
22uH
80V FET
Si7852
80Vin/16cell
Any 100V input;
10Vout@150mA bias
supply
Current mirror:
ZDS1009
R23:
953k
47uH
100V FET
SiR846
Change list:
Li-ion battery Charger
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SMBus High voltage charger solution
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36
SMBus High Voltage Charger Solution
DC Input
Vcc Bias
Supply
TPS54060
8~14V Vcc
CSSN
CSSP
DCIN
ACIN
VDDSMB
Pre-charge
Deeply discharged
Battery
BTST
setting
VREF
SMBUS
CE
PVCC
ACOK
BOOT
SCL
SDA
UGATE
VICM
PHASE
R9 7.5k
GND
C23
51p
Q4
Half Bridge
Gate
Drive
UCC27201
EAO
EAI
VFB
bq24747
1MΩ
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C
VREF
Rs
CSON
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Q5
Buffer
LM358
FBO
R11
200k
Battery Pack
Rsns
Current
Sense
INA169
CSOP
R10 20k
C22
130p
L
LGATE
ICOUT
ICREF
C21
2000p
Vcc
2~3V
Clamp
•Thank you
•Questions
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