CN2935483Y - External battery bag of portable digital equipment - Google Patents

Abstract

A portable external battery pack for digital equipments comprises a charging start-up circuit, an input voltage reducing circuit, a MCU control circuit, a LDO voltage regulator circuit, a power detection circuit, a batteries protection circuit and an output voltage booster circuit. The charging start-up circuit sustains for a period of time before cutting off, when the batteries resumes from an overdischraging protection to the common state and the LDO provides a stable power supply for the MCU. The input voltage reducing circuit charges the single batteries by reducing the high voltage and high current inputted by USB to a low voltage and low current. The LDO voltage regulator circuit stabilizes the single batteries and provides a stable power supply for MCU, which controls the power detection circuit. The batteries protection circuit protects the batteries from overcharging, overdischarging, overcurrent and short circuiting. The output voltage booster circuit charges the digital equipment by boosting the voltage of single batteries.

Description

The external battery bag of portable digital equipment

Technical field

The utility model relates to a kind of external battery bag, relates in particular to a kind of external chargeable power brick of discharging of portable digital equipment.

Background technology

In the market, many portable digital equipments, easy to use, but ubiquity battery capacity deficiency can't satisfy the problem that works long hours and require, and becomes the maximum bottleneck that most mobile digital equipment are used.If increase the capacity of first wife's battery, be subjected to the restriction of several aspects such as volume, weight, cost again, do not meet digital equipment entire machine design volume and dwindle gradually, therefore the trend to thin, light direction develops often need to adopt the secondary power supply of external battery bag as portable digital equipment.Lithium ion battery because of its have in light weight, capacity is big, operating voltage is high, long service life, advantage such as pollution-free are widely used in the mobile digital equipment.

Summary of the invention

The purpose of this utility model is to provide a kind of portable digital equipment external battery bag, and it is chargeable, can discharge, can be as the back-up source of portable digital equipment.

For achieving the above object, the utility model provides a kind of external battery bag of portable digital equipment, and it comprises charge initiation circuit, input reduction voltage circuit, MCU control circuit, LDO voltage stabilizing circuit, electric weight testing circuit, electric core protective circuit, output booster circuit;

The charge initiation circuit returns to common state at electric core by crossing to put to protect, and when LDO provided stabilized power supply to power to MCU, it continued for some time the back and disconnects;

The input reduction voltage circuit becomes the low-voltage low current to give the charging of single-unit electricity core the high voltage and high current step-down of USB input;

The LDO voltage stabilizing circuit is stable with single-unit electricity core voltage, provides a stable power supply to MCU;

The electric weight testing circuit is controlled by MCU;

Electricity core protective circuit plays over-charge protective to electric core, crosses and puts protection, overcurrent protection and short-circuit protection;

The output booster circuit is supplied with the power supply of requisite number decoding apparatus with single-unit electricity core boost in voltage.

The utlity model has following beneficial effect: the utility model portable digital equipment external battery bag, its chargeable storage of electrical energy can be discharged when needed and be used to digital equipment, carries with easy to use.

Description of drawings

Fig. 1 is the utility model portable digital equipment external battery bag schematic diagram.

Fig. 2 is the structural representation that the utility model portable digital equipment external battery bag is opened enclosing cover.

Fig. 3 is the utility model block diagram.

Fig. 4 is a circuit diagram of the present utility model.

Embodiment

See also Fig. 1 to Fig. 4, a kind of external battery bag of portable digital equipment, it comprises loam cake 1, light-conductive hole 2, trim 3, hook 4, bottom 5, electric core 6, leaded light post 7, discharge port 8, charging port 9, pcb board 10.

This power brick feeds alternating current by charging port 9 after the effect of this pcb board 10 converts direct current to fills in this electricity core 6.When using this power brick, be discharged in the digital equipment and use by the electric current of discharge port 8 with storage in the electric core 6.

Electric core 6 adopts the 2P1S lithium-ion electric core in the present embodiment, is giving an example of digital equipment with SONY PSP game machine.

This external battery bag comprises charge initiation circuit, input reduction voltage circuit, MCU control circuit, LDO voltage stabilizing circuit, electric weight testing circuit, electric core protective circuit, output booster circuit.

The charge initiation circuit is to be in when giving electric core 6 chargings after putting protection once more when electric core 6, and electric core 6 is put protection and returned to common state by crossing, and LDO is activated provides the 3V stabilized power supply to power to MCU, and the charge initiation circuit continues to disconnect behind about 500mS.

The input reduction voltage circuit adopts MCU (MC908QT2) to regulate PWM by voltage sample and current sample and exports and control single P channel MOS tube and realize the 5V/1A step-down of USB input is become 4.2V, current limliting 700mA gives single-unit electricity core 6 chargings, charging indicator light is controlled charging by the size of MCU sampling charging current and is sent out a warning, and fills the full conversion that gives a green light.

LDO voltage stabilizing circuit (S-812C30AMC) is stablized into 3V with single-unit electricity core 6 voltages provides a stable power supply to MCU.

The electric weight testing circuit inputs to MCU by connecting a resistance R 10, the R11 electric core voltage (V-CHK) of sampling, and is controlled by MCU.When pressing the electric weight sense switch, electric core voltage gives a green light more than 3.3V and represents can continue to use, and electric core voltage sends out a warning below 3.3V and need to represent charging.

Electricity core protective circuit (DW01+AO8810) is primarily aimed at electric core 6 and plays over-charge protective, crosses to put protection, overcurrent protection and short-circuit protection.

Output booster circuit (S-8355+RSS065N03) mainly is single-unit electricity core 6 boost in voltage to be supplied with the PSP game machine to 5V (Imax=1A) power.

The mode that output adopts output line to add adapter realizes that this power brick can be equipped with the adapter of a SONYPSP game machine, if the user need to other to want the power devices of 5V/1A, also can match the adapter that is fit to voluntarily on market and come to power to equipment needed thereby.

From the electric current of USB input 5V and 1A, become 4.2V through MCU control step-down, current limliting 700mA gives single-unit electricity core 6 chargings, charge mode adopts the CC/CV pattern, sends out a warning during charging, fills to give a green light after full, when MCU detects charging current less than 100mA, it is full to show that electric core has filled, and this moment, charging indicator light can change green into by redness, when not connecting the USB charging, press the electric weight sense switch, when electric core voltage is lower than 3.3V, the indicator light shiny red, showing needs charging; When electric core voltage is higher than 3.3V, the indicator light bright green, expression can also be used.

Claims (1)

1, a kind of external battery bag of portable digital equipment is characterized in that: it comprises charge initiation circuit, input reduction voltage circuit, MCU control circuit, LDO voltage stabilizing circuit, electric weight testing circuit, electric core protective circuit, output booster circuit;

The charge initiation circuit returns to common state at electric core by crossing to put to protect, and when LDO provided stabilized power supply to power to MCU, it continued for some time the back and disconnects;

The input reduction voltage circuit becomes the low-voltage low current to give the charging of single-unit electricity core the high voltage and high current step-down of USB input;

The LDO voltage stabilizing circuit is stable with single-unit electricity core voltage, provides a stable power supply to MCU;

The electric weight testing circuit is controlled by MCU;

Electricity core protective circuit plays over-charge protective to electric core, crosses and puts protection, overcurrent protection and short-circuit protection;

The output booster circuit is supplied with the power supply of requisite number decoding apparatus with single-unit electricity core boost in voltage.

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