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After Sales Technical Documentation
Cigarette Lighter Charger LCH2
Original 50/96
NMP Part No. 0275271
After Sales Cigarette Lighter Charger LCH2 Technical Documentation
CONTENTS
Cigarette Lighter Charger LCH2 . . . . . . . . . . . . . . . . . . . . . . . . . Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Technical Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . States of Charge and Charge Control . . . . . . . . . . . . . . . . . Charge Indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Converter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PulseWidth Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Current Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Block Diagram of AL4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Circuit Diagram of AL4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Layout and Foil Diagrams of AL4 . . . . . . . . . . . . . . . . . . . . . . . Parts List of AL4A (Issue 1.1) Code: 0200044 . . . . . . . . . . Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Assembly Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 3 3 3 3 4 4 4 4 5 5 5 6 7 8 9 11 11
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After Sales Technical Documentation Cigarette Lighter Charger LCH2
Cigarette Lighter Charger LCH2
Related Documentation 4A 3B 4F 6E S 6E 6E 0200044 0200044 9853826 0200044 0675005 0260062 0260094 block diagram AL4 circuit diagram AL4 layout and foil diagrams parts list AL4 exploded view assembly parts LCH2 assembly parts LCH2U
General
The LCH2 cigarette lighter charger is used for charging the battery of the handportable phone from the 12 or 24 V cigarette lighter socket of a motor vehicle. The charger is provided with LED charging indication.
Technical Summary
States of Charge and Charge Control
The LCH2 cigarette lighter charger is used for charging a handportable phone from a car battery. A constantcurrent or constantvoltage output is provided depending on the operating state of the phone. Charge current is supplied through a series switch transistor located in the phone. When the transistor is on the charger supplies a constant current to the phone. The phone is then in the rapid charge mode. When the transistor is off no current is supplied to the phone and the charger is in the constantvoltage mode. Once fully charged in the rapid charge mode, the battery is kept full by means of pulsed charging. Current is switched on and off at a variable duty cycle and a frequency of a few Hz.
Charge Indication
Charger states are indicated with a dualcolour LED located in the cigarette lighter charger unit. In addition, the phone LCD contains a threebar battery status display, operative when power for the phone is on. "Charging sequence active" (state A) is indicated by the bars being lit sequentially, starting from the bottom one. "Battery full" (state B) is indicated by all three bars steadily lit.
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Phone operating status Cigarette lighter charger connected to vehicle, phone disconnected green Phone connected to charger, charging disabled due to battery temperature Rapid charge Battery full > trickle charge Calling state
LED
Display
green red green green/
state A state A state B state A red *)
*) Battery capacity is maintained during a phone call by occasional rapid charge cycles. Consequently, the LED can be indicating either red or green.
Electrical Specifications
Operating input voltage: Input current without phone: Max. input current: Output voltage: · constant voltage · constant current 12.5 ±1 V/0...400 mA 800 ±70 mA/5.0...10 V 9 to 32 V d.c. < 60 mA 1.8 A
Functional Description
General
The charger module consists of a switchedmode converter and a bi colour indicator LED. The converter is of the step up/down type, i.e. the output voltage can be lower or higher than the input voltage.
Converter
Converter input current is received via filter capacitor C101. The converter consists of coils L110, L112, FET switch V112, d.c. level shifting capacitor C111 and Schottky diode V113. Output energy is stored and filtered by C112, L111 and C113. In series with converter coil L112 is resistor R116, used for measuring the output current. When operating, the converter generates a negative voltage drop (as compared to ground level) at R116, directly proportional to output current. Converter control is by N110, a quad comparator with opencollector output. The 5 V reference supply is generated by regulator N100. Original 50/96
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Oscillator
The converter operates at a fixed frequency of 300 kHz, produced by oscillator N110A. A suitable operating voltage for the comparator positive input is set by resistor divider R112/R114. Positive feedback from the comparator output is supplied by R111 in parallel with C104. When the comparator output is high C110 is charged through R110 and R113 until the voltage at the negative input exceeds the positive input. At that instant the comparator output turns low and C110 is discharged via R113.
PulseWidth Control
Pulse width is controlled by comparator N110B, where the sawtooth voltage from the oscillator is compared to a d.c. control voltage. Max. control voltage is set by resistor divider R121/R120 to make sure that pulse width cannot reach 100 % under any conditions as this would mean shortcircuiting VB to GND via V112. When the control voltage drops, so do the pulse width and the converter output current. The control voltage can be pulled down by output current comparator N110C, output voltage comparator N110D, or by the "error" output pin of a reference regulator N100.
Current Limiting
Output current is measured with series resistor R116 connected between L112 and GND. When the converter operates with the output loaded it generates a negative voltage drop (as compared to GND) over this resistor. The voltage drop is added to the positive reference value set by R122 and R123 and used as the current comparator positive input. The current comparator compares the level of this input to zero (ground) level. When the current reaches the limit, voltage at the positive input falls to zero and the comparator output goes down, limiting the duty cycle. The value of the current limit is set by resistor divider R122, R123. A negative feedback for stabilize the comparator is produced with R124.
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Block Diagram of AL4
R
GND
GND
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Circuit Diagram of AL4
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Layout and Foil Diagrams of AL4
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Parts List of AL4A
ITEM R100 R110 R111 R112 R113 R114 R115 R116 R118 R120 R121 R122 R123 R124 R130 R131 R132 R133 R134 R135 R136 R137 C100 C101 C102 C103 C104 C105 C106 C110 C111 C112 C113 C114 C120 C121 C122 C130 C131 L100 L110 L111 L112 CODE 1412536 1414406 1413603 1412536 1412536 1413603 1414406 1400844 1413909 1412511 1414438 1414318 1414438 1412536 1414477 1413723 1412536 1414438 1413723 1414029 1414043 1413829 2310777 2501605 2604209 2604209 2310424 2310777 2505239 2310488 2404094 2404094 2502736 2310777 2604209 2310738 2310738 2610024 2310777 3600007 3607555 3606698 3607555
(Issue 1.1) VALUE 22 k 5.6 k 47 k 22 k 22 k 47 k 5.6 k 0.33 68 18 k 8.2 k 150 k 8.2 k 22 k 12 k 470 k 22 k 8.2 k 470 k 3.3 k 1.8 k 10 22 n 100 u 1.0 u 1.0 u 100 p 22 n 10 u 330 p 470 n 470 n 220 u 22 n 1.0 u 4.7 n 4.7 n 2.2 u 22 n 125 u 60 u 125 u
Code: 0200044
DESCRIPTION Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Melf resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Chip resistor Ceramic cap. Electrol. cap. Tantalum cap. Tantalum cap. Ceramic cap. Ceramic cap. Electrol. cap. Ceramic cap. Polyester cap. Polyester cap. Electrol. cap. Ceramic cap. Tantalum cap. Ceramic cap. Ceramic cap. Tantalum cap. Ceramic cap. Coil Coil Choke Coil
TYPE 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 2 % 0.7 W 6.5x2.5 5 % 0.1 W 0805 5 % 0.1 W 0805 1 % 0.1 W 0805 1 % 0.1 W 0805 1 % 0.1 W 0805 5 % 0.1 W 0805 1 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 1 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 5 % 0.1 W 0805 20 % 50 V 0805 20 % 35 V RM3.5 20 % 16 V 3.2x1.6x1.6 20 % 16 V 3.2x1.6x1.6 5 % 50 V 0805 20 % 50 V 0805 20 % 35 V 5X11 5 % 50 V 0805 10 % 63 V RM5 10 % 63 V RM5 20 % 16 V 3.5MM 20 % 50 V 0805 20 % 16 V 3.2x1.6x1.6 20 % 50 V 0805 20 % 50 V 0805 20 % 16 V 3.2x1.6x1.6 20 % 50 V 0805 1.4 A RM5 2 A d17x12mm MAX. 2 A d17x12mm
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V100 V101 V102 V103 V110 V111 V112 V113 V130 V131 V132 V133 V134 V135 N100 N110 X100
4103529 4200836 4107160 4108639 4200917 4200909 4200868 4100221 4108639 4200909 4200909 4108639 4102974 4200917 4301062 4305733 5448916 3200047 6430105 7113204 7113243 7510302 9500006 9853826 9853826
Trans. supr. 31.4/35V Transistor BCX19 Zener diode BZX84 Diode x 2 BAS28 Transistor BC848B/BCW32 Transistor BC858B/BCW30 MosFet IRF530 Schottky diode 21DQ06 Diode x 2 BAS28 Transistor BC858B/BCW30 Transistor BC858B/BCW30 Diode x 2 BAS28 Led Green/Red Transistor BC848B/BCW32 IC, regulator LP2951AC IC, 4 x comp LM2901 Pin header 1x02 2.54mm Ferrite ring d 3.5x1.3x4.3mm f2 Plast.rivet 2.0x3.0 socket 6.4 Wire stran 0.15mm2 blk Wire stran 0.15mm2 red Adhesive stick jetmelt tc3748 Connector spring PCB AL4A 44X37X1.6 D 8/PA LHC2 PC board AL4A
d5.3x9.5 npn 50 V 0.5 A SOT23 5 % 12 V 0.3 W SOT23 75 V 250 mA SOT143 npn 30 V 100 mA SOT23 pnp 30 V 100 mA SOT23 nch 10 V 14 A TO220 60 V 1.7 A d3.7x7mm 75 V 250 mA SOT143 pnp 30 V 100 mA SOT23 pnp 30 V 100 mA SOT23 75 V 250 mA SOT143 2.1 V 2x5mm npn 30 V 100 mA SOT23 SO8S SO14S
4D21391 LCH2 44x37x1.6 d 8/pa lhc2
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Exploded View
Assembly Parts
ITEM 1 2 3 4 5 6 7 8 9 C1 Q'TY CODE 9450050 9450051 9450052 9500005 6400056 6154430 9370095 7100408 5112050 0200044 DESCRIPTION Cover Bottom Headscrew Headpin Connector spring PTscrew Type label Spiral cable Fuse 3.15 A/250 V AL4 module VALUE, TYPE 1D 21289 1D 21288 3D 21287 4D 21390 4D 21391 25 x 8 WN1442 4D 21487 3D 21247 6.3 x 32 mm
3
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