Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current...
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Transcript of Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current...
![Page 1: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/1.jpg)
Embedded Systems
Power Supply
![Page 2: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/2.jpg)
Consideration
• Voltage– Output voltage– In put voltage
• Current• Ripple• Power Consumption• Isolation• Interference• Protection
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Linear Regulator
• Easy• Higher reliability• Low efficiency• Higher temperature
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Linear Regulator
• LM78XX & LM79XX• Peak current (1A), change with voltage
difference • Vin < 35V• Vin – Vout > 5V• Thermal protection• Over current protection
![Page 5: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/5.jpg)
Linear Regulator
![Page 6: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/6.jpg)
Linear Regulator
Need enough voltage margin according to
working current
![Page 7: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/7.jpg)
Linear Regulator
![Page 8: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/8.jpg)
Linear Regulator
![Page 9: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/9.jpg)
LDO
• Low drop voltage 15mV~150mV• Higher efficiency • Larger current (500mW)
![Page 10: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/10.jpg)
LM1117
LM1117
![Page 11: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/11.jpg)
LM1117 adj
LM1117
![Page 12: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/12.jpg)
LDO
TPS60100
Charge Pump
3.3V I/O Voltage 200mA
TPS7301
LDO
1.8V Core Voltage
1N41
48
1N58
17
From Battery
From Battery
![Page 13: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/13.jpg)
DC-DC Convert
• Why DC-DC convert?– High efficiency– Step-up
• Shortcomings– Complex– Noise– Start-up current– Inductor
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DC-DC Convert
• Types– Step-up (boost)– Step-down (buck)– Invert
• Components– Inductor– Transformer– Capacitor– Diode– Feedback circuitry
![Page 15: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/15.jpg)
Boost
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Boost
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Boost
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Boost
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Boost
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Boost
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Boost
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Buck
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Buck
![Page 24: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/24.jpg)
Buck
![Page 25: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/25.jpg)
Invert
![Page 26: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/26.jpg)
Flyback
![Page 27: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/27.jpg)
Flyback
![Page 28: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/28.jpg)
Push-pull
![Page 29: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/29.jpg)
DC-DC Convert Components
• MOSFETOn resistorMax currentVoltage
• DIODEOn voltagePeak currentSpeed
• InductorPeak Current
![Page 30: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/30.jpg)
Charge Pump
• Simple• High efficient• Low current• Ripple
![Page 31: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/31.jpg)
Charge Pump (Double Voltage)
V+
V+ 2V+
![Page 32: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/32.jpg)
Charge Pump (Double Voltage)
- +
![Page 33: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/33.jpg)
Charge Pump (Negative Voltage)
V+ V-V+
![Page 34: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/34.jpg)
Charge Pump (Negative Voltage)
+
-
![Page 35: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/35.jpg)
Charge Pump
![Page 36: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/36.jpg)
Charge Pump (Negative Voltage)
![Page 37: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/37.jpg)
Charge Pump
![Page 38: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/38.jpg)
Multiple Voltage
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Battery
• Type• Capacity• Voltage change during discharge• Current leakage• Charging circuits• Protection
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Battery
• Ni-Cd– Long history– Low self-discharge current– Relative low capacity– Memory effect– Charge stops at dv/dt<0
![Page 41: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/41.jpg)
Battery
![Page 42: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/42.jpg)
Battery
• Ni-MH– Relative high capacity– No memory effect– Higher self-discharge current– Charge stops at dv/dt=0
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Battery
• Li+– 4.2V– Larger energy density– Strict charge requirements– Internal protection circuit
![Page 44: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/44.jpg)
Battery
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Battery
![Page 46: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/46.jpg)
Battery
![Page 47: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/47.jpg)
Charge steps
• Waiting for battery attached (Li+)• Start charge cycle• If battery voltage to low (2.45V), start trickle
charge (40mA)• Normal charge• Enter intermittence mode when battery
voltage reach float voltage• Stop charge when timer-out
![Page 48: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/48.jpg)
Battery
Charge Protection
DC-DC LDO
LDO
booster control
Main voltage outputs
standby voltage
on/off
• inputted voltage may be higher or lower that 3.3V
• Never cutoff standby voltage
• Need battery charging protection circuits
![Page 49: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/49.jpg)
Power over Ethernet (PoE)
• IEEE P802.3af• Category 5 Cable• 44~57V,typically 48V。• Max current 550mA, Max startup current
500mA。• Provide 5 stage power supply: 3.84~12.95W
![Page 50: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/50.jpg)
Connection
2schemes
11 2 33 4 5 66 7 8Rx Tx TxRx
DC+ DC DC
11 22 33 4 5 66 7 8Rx Tx TxRx
DC+ DC
usign data pin
using idle pin
![Page 51: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/51.jpg)
Implement of PoE
占用空闲管脚的连接
48V
![Page 52: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/52.jpg)
PoE device probe
detect the value of RPD to determine whether it
support POE120nF capacitor parallel with
25KΩ±5%
![Page 53: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/53.jpg)
Detect power class of PD
Apply different voltage and measure current to discover the
power class of PD
![Page 54: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/54.jpg)
Power System Design
Steps1. Collect voltage & current data2. Construct power tree3. Verify current of each path4. Verify efficiency on each node5. Adjust tree structure
![Page 55: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/55.jpg)
Module Voltage Current Note
CPU 1.8V 80mA Core voltage. Can be shut down in sleep mode
3.3V 100mA IO voltage, memory sub-system voltage. Should be stable enough
Audio 3.3V 10mA CODEC, analog sub-system voltage, can be shutdown. Low noise voltage
3.3V 10mA CODEC, digital sub-system voltage, can be shutdown
5V 20mA Power Amp, can be shutdown. Low noise voltage
LCD 3.3V 50mA Digital signal. Keep power-on sequence, can be shutdown
-12V 5~10mA Keep power-on sequence, can be shutdown
5V >100mA Backlight invert, can be shutdown
![Page 56: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/56.jpg)
Design• Power tree– Source
• Battery• Wall adapter
– Different branched for different voltages– Separate one voltage branches if necessary
• Analog-Digital• Shutdown function• Interference• Current• Protection
– Move branches to reduce power consumption– Select chipsets for the implementation
![Page 57: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/57.jpg)
Bad Design Example
Step-up Step-down
Battery
5V
LCD Backlight
CPLD
CPU & Memory
1.8V
Buttons, LEDs
External Power in
Charge LDO
LDO
Step-up
3.3V
3.3V
Audio Power Amp.
Audio CODEC
LCD module
Step-up
![Page 58: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/58.jpg)
Good Design Example
DC-DC
Battery
5V
LCD Backlight
CPLD
CPU & Memory
1.8V Buttons,
LEDs
External Power in
Charge LDO
Step-down
DC-DC
3.3V
3.3V
Audio Power Amp.
Audio CODEC
LCD module
DC-DC
Buttons
LDO
DC-DC
4V
4.2V ~ 2.7V
LDO
LDO LDO
3.3V
5V
12V
Charge Pump
5V
![Page 59: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/59.jpg)
Design Example
LM317
LM7805
7v 2A
CPLD
CF
LCD
Audio, Touch screen, RS232,
IrDA, BSR, BCR, Bus
LEDs
TPS7333 TPS7333
TPS7333
LM7805
USB
Backlight voltage inverter
4.2v 1500mA
LM317 Processor
board
5v 1500mA
To extended
port
4.2v 1500mA
5v 1500mA
To extended
port
No limit on power efficiency
![Page 60: Embedded Systems Power Supply. Consideration Voltage – Output voltage – In put voltage Current Ripple Power Consumption Isolation Interference Protection.](https://reader035.fdocuments.in/reader035/viewer/2022062516/56649dbe5503460f94ab1fd0/html5/thumbnails/60.jpg)
Hand held dev. using USB charging(example)
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Power on order
TPS60100
Charge Pump
3.3V I/O Voltage 200mA
TPS7301
LDO
1.8V Core Voltage
1N41
48
1N58
17
From Battery
From Battery
Ensure on startup, Vcore won’t be higher than Vio too much
Viocannot be higher that Vcore too much
Vio
Vcore
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Power on order——Implement by power tree