compaq laptop battery

Intelligent lithium-ion battery charger(c) Compaq Laptop Battery

Part 3 Control Circuit Design

C8051F310 Singlechip

① analog peripherals

A.10-bit ADC: conversion speed up to 200ks / s, can be as many as 21 or 17 external single-ended or differential input, VREF may be externally or VDD pin select dell laptop battery, built temperature sensor (± 3 ℃), external conversion start input;

b. two analog comparator: Backlash programmable voltage and response time,Compaq EVO N610C Battery, Compaq EVO N620C Battery, Compaq Presario 1200 Battery, can be configured as interrupt or reset source, a small current (0.5μA).

② Supply Voltage

a. Typical operating current: 5mA, 25MHz;

b. a typical shutdown current: 0.1μA;

c. temperature range: -40 ~ +85 ℃.

③ high-speed 8051 microcontroller core

a. command line structure: 70% of the instruction execution time forCompaq EVO N610C Battery, one or two system clock cycle;

b. speed up 25MI / s (when the clock frequency of 25MHz);

c. expansion of system interruption.

④ digital peripherals dell inspiron 8000 battery

a.29/25 port I / O: all of the population are resistant to 5V voltage line;Compaq EVO N610C Battery, Compaq EVO N620C Battery, Compaq Presario 1200 Battery,

b.4 a generic 16-bit counter / timers;

c.16-bit programmable counter / timer array (PCA), has 5 capture / compare module;

d. the use of PCA or timer and external clock sources in real-time clock mode.

Control circuit shown in Figure 2, P0.3 to provide charging power supply port, P0.6 I Detect the size of charging voltage, P0.5 I Detect the size of the charge current inspiron 4000 battery,Compaq EVO N620C Battery, P0.4 I Detect battery temperature.

Charge current by the single-chip pulse width modulation PWM generation, the charge current from AD calculated after conversion.

4 Charging and testing some parts of circuit design

Figure 3 for the charging circuit and detection circuit.

① Charging curve

Figure 4 shows, the charging process by the pre-charge state, constant-current charge state and charge state composition of constant pressure.

② Express Converter

Diminuendo charger termination realize inspiron 4100 battery the most economical way is to use a fast converter. Compaq Presario 1200 Battery,Converter Express is a inductor and / or a transformer (when required isolation transformer), as the energy inspiron 8100 battery storage unit to a discrete form of energy packets of energy transfer from input to output switching regulator feedback circuit through the transistor to regulate energy transmission, but also as a filter switch, Compaq EVO N610C Battery, Compaq EVO N620C Battery, Compaq Presario 1200 Battery,to ensure that the voltage or current in the load constant.