How to Repair All Batteries
Low Battery 7-5 7-16. Low Battery Indicator Detector and Low Battery Disconnect Test 7-10 The Battery Pack Option PCA consists of the five functional blocks illustrated in Figure 7-1. Each block is described below The Switching Power Supply regulates the 7.5 V-to-35 V raw dc input provided by the main circuit board (J1-7). The supply output (9.3 V to 9.8 V, temperature-compensated) is used to charge the 8 V lead-acid battery. The Cycle Float Charge Rate Switch monitors the charging current required by the battery pack and sets the output voltage accordingly (9.35 V for trickle charging, or 9.8 V for cyclic charging). Low Battery Indicator Detector The Low Battery Indicator Detector monitors the battery pack voltage, outputting a logic low to turn on the meter low voltage indicator when the battery pack voltage is below approximately 7.7 V. Low Battery Disconnect The Low Battery Disconnect circuit interrupts meter loading on the battery pack when...
The LTC1174 (3.3V, 5V and adjustable versions) can convert a 9V battery source to system power with very high efficiency. Efficiency is over 90 at load currents from 20mA to 425mA and over 85 at a load current of 4mA. For a given load, maximum battery life can be obtained by minimizing shutdown current during system shutdown and maximizing converter efficiency during operation. A single control line to the LTC1174 can be used to select shutdown mode or operational mode, as required. The CD4012 and CD4013 are powered from the battery the 2N2222 provides simple level shifting to the battery rail. R1 and C1 ensure that the circuit remains in power-down mode during battery replacement. The circuit shown here provides approximately 90 efficiency at 250mA load current, and consumes less than 1 iA shutdown current. Turn-on and turn-off transitions are very clean.
Using a power adapter with the highest feasible output voltage is attractive to portable system designers for a couple of reasons. Lower current is required to maintain the same system power, which translates into a smaller cable and input connector. If the adapter output voltage is considerably higher than the battery voltage, the adapter output voltage does not need to be regulated or well filtered, resulting in lower adapter cost. A portable system with a high output-voltage adapter, however, requires that the system's DC-to-DC converter functions over a very wide range of input voltage from fully discharged battery voltage to the highest adapter output voltage. This problem can be resolved by using the LT1510 as both the battery charger and the main step-down converter, as shown in Figure 244. An important feature of the circuit in Figure 244 is the glitch-free transfer from AC operation to battery operation and back.
The LT1511 3A Battery Charger Charges All Battery Types, Including LT1512 LT1513 Battery Chargers Operate with Input Voltages Above or Below the Battery Voltage 116 Li-Ion Battery Charger Does Not Require Precision High Efficiency, Low Dropout Lithium-Ion Battery Charger Charges Up to Five Cells at 4 Amps or More 122 Battery Charger IC Can Also Serve as Main Step-Down 800mA Li-Ion Battery Charger Occupies Less Volume than Two Stacked
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is three years for the Analyzer and one year for its accessories. The warranty period begins on the date of shipment. Parts, product repairs and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries or to any product which, in Fluke's opinion, has been misused, altered, neglected or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will be error free or operate without interruption. 5.2.2 Removing the Battery
To ensure operation within the accuracy specifications, the battery should be replaced when the voltage measured at the center o the battery eliminator connector falls below -3.00 volts (with respect to the COMMON input). If the battery voltage falls to a point where the BT is displayed and the digital display is inactive or no longer responds to a signal input, the battery should be replaced immediately to prevent damage to the LCD. 6. Carefully pull the battery clip free from the battery terminals as shown in Figure 2-2. 7. Press the battery clip onto the replacement battery and return both to the battery compartment. A 3 digit display (1999 max) with decimal point and minus polarity indication. Used to indicate measured input values, overrange condition, low battery condition and level. 2-24. The display has two abnormal status indicators (Figure 2-5), low battery power and instrument overrange. A BT is displayed when approximately 20 of battery life remains (battery replacement is...
The installed batteries and the batteries for the DATA card are monitored as to whether they have sufficient voltage or not by the voltage which is conducted to pin number 52 (installed batteries) and pin number 53 (card batteries) on IC36 (on the* MB). Battery power is sufficient if the voltage is more than + 2.7V and less than + 3.5V error messages are shown when the voltage is not within that range. b) Display shows DATA card battery low . Refer to 13 3. Low Internal Battery Power. b) DATA card battery low
When a memory read or memory write cycle intended for the IEEE-488 Controller (A5U6) is in progress, the 13 address bits ADD(15) through ADD(3) from A1U6 are decoded by A5U1, A5U2, and A5U5 to generate an active low chip-select signal. The chip-select signal (A5U5-8) goes low when two events occur OPTSW* (A5J3-12) is near -5.2V dc (VEE), and the address bus indicates that the Microprocessor is accessing memory between addresses 0028 and 002F hexadecimal (inclusive). When the Fluke 45 is operating on battery power, the Microprocessor turns off the power to the IEEE-488 Assembly by driving the OPTSW* signal (A5J3-12) to VCC. This signal drives A5U1-6 to about +4.3V dc (through A5CR1), disabling the Address Decoding Circuit. Further, software does not allow the IEEE-488 Interface Option to be selected if the ACON* signal is detected high. Since ACON* is high when the meter is operating on battery power, the IEEE-488 Interface Option cannot be selected as the active interface during...
Turn the ScopeMeter on (battery power only) If one or more times a current of about 1.2 mV is measured (8 mA), the cause is a defective IC D3550. This IC takes care of a correct power state of D3500. As the 8 mA discharge current can have damaged the battery, you must check the battery capacity as described below.
Disconnect the BC190 Battery Charger Power Adapter 4. When the battery is discharged the ScopeMeter will shut down. Now connect the BC190, turn the power on and check the length of the TrendPlot trace. For a new battery pack this should be about 4 hours. Depending on the number of applied charge cycles the battery capacity will decrease. If the TrendPlot trace has a length of 3 hours or less you may consider to replace the battery pack.
The shape of the armature voltage waveform reminds us that when the transistor is switched on, the battery voltage V is applied directly to the armature, and during this period the path of the armature current is indicated by the dotted line in Figure 4.13(a). For the remainder of the cycle the transistor is turned 'off' and the current freewheels through the diode, as shown by the dotted line in Figure 4.13(b). When the current is freewheeling through the diode, the armature voltage is clamped at (almost) zero. To study the input output power relationship, we note that the battery current only flows during the 'on' period, and its average value is therefore kIdc. Since the battery voltage is constant, the power supplied is simply given by V(kIdc) kVIdc. Looking at the motor side, the average voltage is given by Vdc kV, and the average current (assumed constant) is Idc, so the power input to the motor is again kVIdc, i.e. there is no loss of power in the ideal chopper. Given that k is...
When fast charging NiCd batteries with constant current, the internal battery temperature rises toward the end of the charge. Since the temperature coefficient of NiCd is negative, the temperature rise causes the battery voltage to drop. The drop can be detected and used for termination (called -AV termination). The circuit in Figure 234 is a solution for a 3-cell (Panasonic P140-SCR) NiCd battery charger with -AV termination. To determine the voltage droop rate, the battery was connected to an LT1510 charger circuit programmed for a 0.8A constant-current. The data was plotted as voltage versus time and the results are shown in Figure 235. The voltage slope is calculated to be -0.6mV s. After the battery voltage dropped 300mV from the peak of 4.93V (100mV per cell), the charger was disabled. At the heart of the circuit in Figure 234 is U3, a sample-and-hold IC (LF398). For every clock pulse at pin 8, the output of U3 (pin 5) updates to the input level on pin 3. When the battery...
The Operational mode is entered when the test tool is powered by batteries only, and is turned on. The Fly Back Converter is on, the batteries supply its primary current. If the battery voltage (VBAT) drops below 4V when starting up the fly back converter, the Off mode is entered.
The basic application of the LT1579 is shown in Figure 223. It uses two independent voltage sources for the inputs. These voltage sources may be batteries, wall adapters or any other DC source. The low-battery comparators are configured to give a low output if either input voltage drops below 5.5V. The trip points can be adjusted by changing the values of the divider resistors (R1 and R2 for LB1, R3 and R4 for LB2). All logic outputs (LBO1,
Most battery chargers comprise nothing more than a series-pass regulator with current limit. In solar-powered systems, you can't count on sufficient headroom to keep a series regulator alive, so a shunt method is preferred. A simple shunt battery charger is shown in Figure 246. It consists of an op amp driving a shunt transistor and ballast resistor, and is built around an LT1635. This device contains both an op amp and a reference, making it perfectly suited for regulator and charger applications. Operation is straightforward the battery voltage is sensed by a feedback divider composed of two 1M resistors. The internal 200mV reference is amplified to 7.05V and compared against the feedback. RT1 introduces a TC that accurately tracks the battery's correct charging voltage over a wide temperature range. Because RT1 is designed to compensate for changes in battery temperature, it should be located close to the battery and as far as possible from the shunt elements. When the battery...
Check P-ASIC N4000 60 (VBATSUP) for 4.8V. If wrong check R4112, and connections to battery pack. 6. Check X-tal signals on M3504 (32 kHz), M3506 (40 MHz), and M3505 (3.6864 MHz) if wrong check connections, replace X-tals, replace D3500. If the test tool is off AND not powered by the Battery Charger Power Adapter, only the 32 kHz clock runs. If the 3.6864 MHz clock is present, then continue at Section 7.4.3.
Linear Technology has developed many new switcher-based battery charger ICs. Testing accuracy, regulation and efficiency in the lab with a battery load is inconvenient because the terminal voltage of a battery constantly changes as it is being charged. If much testing is to be done, a large supply of dead batteries will be needed, since one set of cells can quickly become overcharged. This article describes an active load circuit that can be used to simulate a battery in any state of charge. The battery simulator provides a constant-voltage load for a battery-charging circuit, independent of applied charging current. The simulator's impedance is less than 500mQ at all reasonable input frequencies. Best of all, the simulator can never be overcharged, allowing long-term testing and debugging of a charger system without the possibility of battery damage. The battery simulator circuit has been tested swallowing currents from 30mA to 3A with the output voltage essentially unchanged. When...
The Fluke 45 incorporates a semi-modular design determining modules not related to a problem constitutes the first step in the troubleshooting process. Disconnect the Battery Option cable at the Main PCA. Disconnect the IEEE-488 Interface Option at P2 and P3 on the IEEE-488 Interface PCA. If either of these assemblies is causing the meter failure, refer to troubleshooting information in Chapters 7 and 8 (7 for the Battery Pack Option, 8 for the IEEE-488 Interface Option.)
Power the test tool by the battery pack only, then by the power adapter only. 2. The test tool operates with the battery pack, but not with the power adapter only, and the battery pack is not charged by the test tool continue at 7.3 Charger Circuit. 3. The test tool operates neither with the battery pack, nor with the power adapter continue at 7.4 Starting with a Dead Test Tool. Battery Pack Battery pack, connector, sense resistor
One of the problems that designers of portable equipment face is generating a regulated voltage that is between the charged and discharged voltage of a battery pack. As an example, when generating a 3.3V output from a 3-cell battery pack, the regulator input voltage changes from about 4.5V at full charge to about 2.7V when discharged. At full charge, the regulator must step down the input voltage, and when the battery voltage drops below 3.3V, the regulator must step up the voltage. The same problem occurs when a 5V output is required from a 4-cell input voltage that varies from about 3.6V to 6V. Ordinarily, a flyback or SEPIC configuration is required to solve this problem.
Option -01 Battery Pack Each option is allocated a separate chapter 7 for the Battery Pack Option -01 and 8 for the IEEE-488 Interface Option -05. Option -15 incorporates both Options -01 and -05. Chapter 7 includes the full range of Service Manual topics (specifications, theory of operation, maintenance, list of replaceable parts, etc.) for the Battery Pack option. Schematic diagrams for the options are found in Chapter 9.
Method (a) uses a variable resistor (R) to absorb whatever fraction of the battery voltage is not required at the load. It provides smooth (albeit manual) control over the full range from 0 to 12 V, but the snag is that power is wasted in the control resistor. For example, if the load voltage is to be reduced to 6 V, the resistor (R) must be set to 2 V, so that half of the battery voltage is dropped across R. The current will be 3 A, the load power will be 18 W, and the power dissipated in R will also be 18 W. In terms of overall power conversion efficiency (i.e. useful power delivered to the load divided by total power from the source) the efficiency is a very poor 50 . If R is increased further, the efficiency falls still lower, approaching zero as the load voltage tends to zero. This method of control is therefore unacceptable for motor control, except perhaps in low-power applications such as model racing cars. Finally, we need to check that the freewheel diode prevents any...
In automotive and portable applications, batteries are used as a power source for DC DC converters. A 12 V supply used in automotive applications can have a wide range of terminal voltage, typically 9 V to 16V during normal operation using a lead-acid battery, but can go as low as 6.5 V during cold-crank and as high as 90 V during load-dump (when the battery is disconnected). The peak voltage is usually clamped to about 40 V, using a voltage dependent resistor to absorb the energy.
To operate in an environment where the input voltage could be higher or lower than the output voltage, a buck-boost (or boost-buck) circuit is necessary. Boost-buck circuits were described in Chapter 7. The situation of having a load voltage range that overlaps the supply voltage range is commonly found in automotive applications. The battery voltage rises and falls with a large variation, as the engine speed and battery conditions change.
If the source of supply is d.c. (for example in a battery vehicle or a rapid transit system) a chopper-type converter is usually employed. The basic operation of a single-switch chopper was discussed in Chapter 2, where it was shown that the average output voltage could be varied by periodically switching the battery voltage on and off for varying intervals. The principal difference between the thyristor-controlled rectifier and the chopper is that in the former the motor current always flows through A single-switch chopper using a transistor, MOSFET or IGBT can only supply positive voltage and current to a d.c. motor, and is therefore restricted to quadrant 1 motoring operation. When regenerative and or rapid speed reversal is called for, more complex circuitry is required, involving two or more power switches, and consequently leading to increased cost. Many different circuits are used and it is not possible to go into detail here, though it should be mentioned that the chopper...
Many battery-powered applications require very small amounts of load current from the regulated supply over long periods of time, followed by moderate load currents for short periods of time. In these types of applications (for example, remote data-acquisition systems, hand-held remote controls, and the like), the discharge rate of the battery is dominated by the overall current demands under low load conditions. In such low load systems, a primary source of battery drain is the DC DC converter that converts the battery voltage to a regulated supply.
FB pin regulates the output by gating the LT1316's oscillator. A charge pump (C2 and associated diodes) coupled to the LT1316's switch pin generates the negative output voltage. This negative output (VOUT2) is monitored by the LT1316's low-battery detector through the resistor divider R3 and R4, using the positive 20V output as a reference. When the negative output falls below 10v, the low-battery detector output (LBO pin and lowest trace in Figure 146) turns Q1 on, enabling the charge pump and charging output capacitor C4. Note that the switch pin jumps between ground and 10V during this period. Once the negative output has been charged enough to overcome the low-battery detector's hysteresis, Q1 turns off and the switch pin is free to fly to 20V, charging the positive output.
Each Fluke product is warranted to be free from defects in material and workmanship under normal use and service. The warranty period is one year and begins on the date of shipment. Parts, product repairs, and services are warranted for 90 days. This warranty extends only to the original buyer or end-user customer of a Fluke authorized reseller, and does not apply to fuses, disposable batteries, or to any product which, in Fluke's opinion, has been misused, altered, neglected, contaminated, or damaged by accident or abnormal conditions of operation or handling. Fluke warrants that software will operate substantially in accordance with its functional specifications for 90 days and that it has been properly recorded on non-defective media. Fluke does not warrant that software will be error free or operate without interruption.
Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the manufacturer. Discard used batteries according to the manufacturer's instructions. When replacing the lithium batteries, follow the note below. Dispose of the used battery promptly. Keep away from children. Do not disassemble and do not dispose of in
RAM battery backup is accomplished by a 78M05C 5-volt regulator that is used to generate a 5.6 volt supply for the RAMS. A 5.6 volt supply voltage is obtained by using a diode drop in the common leg of the regulator to ground which biases the common to +0.6V. The diode in series with the output drops it back down so at the junction of the three diodes, CR4, CR5 and CR6, the VRAM supply ends up at approximately 5 volts again under normal circumstances. A lithium battery voltage source provided through diode CR6 supplies power to the RAMs when the VCC supply drops. When power is lost, the RAMs can be damaged if the input voltages to the RAMs are still at or near 5 volts while the VRAM supply has dropped to the 2 or 3 volt battery level. To prevent this, the diode CR8, resistor R23 and capacitor C14 on the input, hold the non-battery VRAM supply up longer than the VCC. Thereby, VRAM only drops to the battery voltage after VCC has dropped below it.
Power supply , Battery charger The test tool can be powered by the BC190 Battery Charger Power Adapter, or by the NiMH (Nickel Metal Hydride) battery pack. If the power adapter voltage is present, it supplies the test tool power, and the battery charge current via the Charger circuit (VBAT voltage). The battery charge current is sensed, and controlled by the P-ASIC by changing the output current of the Charger circuit. If the power adapter voltage is not present, the battery pack supplies the VBAT voltage. The +3V3GAR supply voltage powers the D-ASIC, RAM, and FlashROM. If the test tool is turned off, the battery supplies the +3V3GAR voltage via the 3V3 Supply circuit. This circuit is controlled by the P-ASIC. So when the test tool is turned off, the D-ASIC can still control the battery charging process, the real time clock, the on off key, and the serial RS232 interface (to turn the test tool on via the interface). To monitor and control the battery charging process, the P-ASIC...
The unit operates on disposable batteries. Battery type input is digital a high input informs the CPU that rechargeable batteries are in use. If rechargeable batteries are used, the battery and the VRECHARGE terminals are mechanically connected. This applies the battery voltage to VRECHARGE, pulling BAT_TYPE high. R100 and CR27 are a current-limiting resistor and a voltage-clamping diode that are used to protect the input port from excessive battery voltage. If disposable batteries are used, VRECHARGE is electrically isolated, which allows R101 to pull BAT_TYPE input low. The nominal voltages and voltage discharge curves are significantly different between rechargeable and disposable batteries. In order for the CPU to predict how much battery life remains, the nominal voltage and discharge curves must be known the BAT_TYPE signal provides that information When a low battery voltage condition is present, the N-20PA adjusts power to the printer's head however, a weak battery voltage...
The CHARCURR signal controls the battery charge current. 2. the voltage between N4000 5 and 9 for 400 500 mV for a battery temperature of about 20 C. The voltage increases when the temperature rises. If wrong check the NTC in the battery pack for 10 kQ at 20 C (X4100 pins 3 and 2) check connections to N4000.
The circuit shown in Figure 185 uses the low-battery comparator as a feedback comparator to produce an auxiliary 3.3V regulated output from the Vout of the LTC1514-5. A feedback voltage divider formed by R2 and R3 connected to the comparator input (LBI) establishes the output voltage. The output of the comparator (LBO) enables the current source formed by Q1, Q2, R1 and R4. When the LBO pin is low, Q1 is turned on, allowing current to charge output capacitor C4. Local feedback formed by R4, Q1 and Q2 creates a constant current source from the 5V output to C4. Peak charging current is set by R4 and the VBE of Q2, which also provides current limiting in the case of an output short to ground. R5 pulls the gate of Q1 high when the auxiliary output is in regulation. C5 is used to reduce output ripple. The combined output current from the 5V and 3.3V supplies is limited to 50mA. Since the regulator implements a hysteretic feedback loop in place of the traditional linear feedback loop, no...
PIA CE9,10,11) is used to interface the clock calander chip at E12. This clock has a 3-7 volt Lithium cell to maintain the time when the computer is turned off. The battery is not rechargeable and must be replaced when flat. Battery life is approximately 3 years. Diodes CR5 and CR4 isolate the battery from the 5 volt supply, so that the battery is only connected to the clock when the 5 volt supply drops. Transistors Q2, Q1 on drawing Q133-03, and associated components Interface the PIA's signal levels to the clock and control the power-down function of the clock so that no false writes occur at power-on and off. An optically isolated power down signal is available at connector pins 6IB and 62B, from the opto-isolator at All.
The monitor must operate for at least 4 hours before the monitor automatically powers down due to low battery condition. Verify that the low battery alarm occurs 15-30 minutes before the battery fully discharges. Allow the monitor to operate until it automatically powers down due to low battery condition. Verify that an audible alarm sounds when the monitor automatically shuts down. Press the alarm silence button to terminate this audible alarm.
U16 is the input port external to the CPU. The logic levels on the inputs (pins D1-D8) are output to the CPU via the AD bus while EXINEN is strobed low. All of the user control buttons are input via U16. Also, the battery type is senses via U16 a high on signal BAT_TYPE signifies to the CPU that rechargeable batteries are being used. If the optional printer head is in the home position, PR_HOME will be a logic high.
This solution requires low-battery detection, necessitates battery access and invites inadvertent battery removal. The LTC1558 battery backup controller eliminates these problems by permitting the use of a single, low cost 1.2V rechargeable Nickel-Cadmium (NiCd) cell. The LTC1558 has a built-in fast- trickle-mode charger that charges the NiCd cell when main power is present.
U2 writes range settings and a d converter information to U1. U2 reads a d converter results and status information. This includes the low battery check, slide-switch position, continuity check, and VCHEK data. The microcomputer performs math operations on the raw data from U1 and configures it for the LCD. U2 also reads pushbutton inputs. Finally, the 2.1 MHz clock signal at U2 is divided down to 131 kHz and sent to U1 (CLK pin) for the counter.
The Power Supply PCB is capable of operating on a 6 Volt lead acid battery. On board circuitry can charge the battery. The N-400 does not use a battery, but the output of this circuitry powers a programmable micropower voltage regulator which, in turn, powers all of the circuitry for controlling the On Standby function.
This screen displays the current value of each analog-to-digital (A D) channel, in volts. Some of the channels are for AC-coupled signals (such as ECG input), so the numbers on the screen will be constantly changing when an input signal is present. These AC-coupled values indicate whether basic functionality of the channel is present, but no significance can be derived from the values of the numbers displayed. However, other A D channels read DC voltages, (for example, power supply voltages and battery voltage) so those voltage values provide useful diagnostic information. (BATTERY VOLTAGE) X 0.5
Current programming limitations previously mentioned, to produce a high current, high performance constant-voltage constant-current battery charger for lithium-ion and other battery types. extends up to 28V. This amplifier is used to level shift the differential sense voltage, which is riding on the battery voltage, and reference it to the internal 5V VCC voltage generated by the LTC1435. This level-shifted signal is used to drive the LTC1435 current sense pins, thus providing current mode feedback for the constant-voltage feedback loop. This signal is also used to control the constant output current feedback loop, as explained below. The constant-current feedback loop operates as follows. With a discharged battery connected to the charger, and assuming that the battery voltage is less than the float voltage programmed by R2 and R3, the error amplifier in the LTC1435 begins pulling up on the ITH pin. This increases the peak inductor current in an effort to force the battery voltage to...
Crystal Y1 provides an accurate 32.768 KHz clock input whenever the timekeeping circuitry of U29 is activated. The CPU only enables the timekeeping function when an optional printer is installed. If no printer is installed, the CPU switches off timekeeping, thereby extending battery life. Also, with no printer installed, the RTC clock is only used during diagnostic testing to verify the CPU clock timing.
NOTE Storing the NBP-3900 for a long period without charging the battery may degrade the battery capacity. A complete battery recharge when not using the monitor requires 8 hours. The battery may be recharged while the monitor is in use in which case, the battery will require 14 hours to be recharged. The battery may require a full charge discharge cycle to restore normal capacity. Nellcor Puritan Bennett recommends that the NPB-3900's sealed, lead-acid battery be replaced at 2-year intervals. Refer to Section 6, DisassemblyGuide.
Approx. 214 g (7.5 oz) (including battery pack NP-FC10, Memory Stick and wrist strap, etc.) Built-in microphone Electret condenser microphone Built-in speaker Dynamic speaker NP-FC10 battery pack Used battery A V connecting cable (1) NP-FC10 battery pack (1) AC-LS1A AC power adaptor (1)
The battery charge and battery performance tests should be performed before monitor repairs whenever the battery is suspected as being a source of a problem. All other tests should be performed following monitor repairs. Before performing the battery performance test, ensure that the battery is fully charged (paragraph 3.3.1).
Dual-Battery PowerPath Switch Driver VGG Regulator, Inrush Limiting and Switch-Gate Drivers Figure 253. Dual-Battery PowerPath Switch Driver VGG Regulator, Inrush Limiting and Switch-Gate Drivers microprocessor to select the appropriate battery. The microprocessor monitors the presence of batteries and the AC adapter through a supply monitor block, or, in the case of some battery packs, through a thermistor sensor. This block comprises a resistor divider and a comparator for each supply. If the AC adapter is present, the two switches are turned off by the microprocessor and the power is delivered to the input of the system DC DC switching regulator via a Schottky diode.
|Recondition Battery Guide|
DIY Battery Repair
You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.