CN201001047Y - An external battery for a laptop - Google Patents

Abstract

The utility model discloses an external battery for a notebook computer, which is mainly composed of a shell, a main board built in the shell, and a battery cell. , the switching power supply module is also connected with an output voltage conversion module, and the output voltage conversion module converts and outputs the voltage processed by the switching power supply module. Compared with the prior art, the utility model can output working voltages suitable for different models of notebook computers, and can simultaneously realize the reading and writing functions of SD/MMC flash memory data cards.

Description

An external battery for a laptop

Technical field:

The utility model relates to an external battery for a notebook computer, in particular to an external battery for a notebook computer capable of outputting multiple voltages and integrating SD/MMC card reading and writing functions.

Background technique:

Lithium-ion batteries are widely used in notebook computer power supplies due to their light weight, large capacity, high working voltage, long service life, and no pollution. Therefore, it must match the operating voltage and operating current of the notebook computer, otherwise the service life of the battery will be shortened, so the original batteries of this type of equipment are also configured separately, and there is no uniform standard among different manufacturers and different models of products, so they cannot be used universally. , the same external battery also has the limitation that it can only be used for one kind of notebook computer.

Invention content:

In order to solve the problem that the notebook external battery can only be used for one type of notebook computer, the utility model provides an external notebook computer battery capable of outputting multiple voltages.

The utility model is mainly realized through the following technical solutions: an external battery for a notebook computer, which is composed of a casing, a mainboard and a battery cell built in the casing, and the mainboard is provided with a device for stepping up and down the battery cell. The switching power supply module is processed, the switching power supply module is also connected with an output voltage conversion module, and the output voltage conversion module converts and outputs the voltage processed by the switching power supply module.

The main board is also provided with a universal circuit module for reading and writing data of SD/MMC flash memory card, and the housing is provided with a USB port and a card reader port connected to the general circuit module for reading and writing data of SD/MMC flash memory card.

An output voltage shift switch connected to the output voltage conversion module is arranged on the housing.

The housing is also provided with a power input interface and a power output port.

The bottom of the housing is provided with a non-slip foot pad for increasing friction.

The utility model is provided with a switching power supply module for performing step-down processing on the battery cells and an output voltage conversion module for converting the output voltage on the main board, so as to output working voltages suitable for different types of notebook computers. The SD/MMC card reading and writing function is also realized through the general circuit module for reading and writing data of the SD/MMC flash memory card arranged on the main board.

Description of drawings:

Fig. 1 is a three-dimensional schematic diagram of the utility model.

Fig. 2 is the structural assembly diagram of the utility model.

Fig. 3 is a circuit diagram of the utility model.

Fig. 4 is the circuit signal flowchart of the utility model.

Instructions in the figure: Voltage output port 1, shift switch 2, power input interface 3, USB interface 4, card reader socket 5, non-slip mat 6, upper cover 7, lower cover 8, battery cell 9, battery cell 10 , protection board 11, main board 12, light board 13.

Detailed ways:

The utility model will be described in further detail below with reference to the accompanying drawings and specific embodiments, wherein the processed output voltage of the utility model is 16V/19V as an example.

As shown in Figures 1 to 2, the utility model is mainly composed of a housing, a main board and a battery cell built in the housing, wherein the housing includes an upper cover 7 and a lower cover 8, which are arranged on one side of the housing There is a voltage output port 1 for powering the notebook computer, through which the suitable working voltage can be provided for different types of notebook computers; the shift switch 2 is used to adjust the output voltage, and the shift switch 2 is used to adjust Output voltage, the shift switch 2 is electrically connected to the main board 12 in the casing, and can output voltage according to needs. When it is necessary to output 16V voltage, adjust the shift switch 2 to output from the voltage output port 1; when it is necessary to output When the voltage is 19V, the shift switch 2 can also be adjusted; the power input interface 3 is used to supply power to the internal circuit of the utility model, and the voltage enters the circuit through the power input interface 3 to charge and discharge the battery cell, and then after a series of treatments, the voltage is changed from The output port 1 outputs; the housing also includes a USB interface 4 and a card reader socket 5 for SD/MMC flash memory card reading and writing data; in addition, four non-slip foot pads 6 are also provided at the bottom of the housing, so The anti-slip foot pad 6 can effectively increase the friction between the utility model and the contact surface, so that the utility model will not slip even if it works on a table with a certain inclination angle.

The housing is mainly composed of the main board 12 and the battery cell, wherein the main board 12 is provided with a switching power supply module and an output voltage conversion module, and the switching power supply module realizes step-down and step-down processing of the battery cell and outputs voltage from the battery cell. The voltage conversion module converts the above-mentioned output voltage so that the output voltage value reaches the required value; the battery cell includes a cell 9 and a cell 10, and the cell 9 includes six 3945135 cells, of which the six 3945135 cells First connect any two of the cells in parallel, and then connect three parallel cells in series. Cell 10 includes 10 18650 cells, among which any two of the 10 18650 cells are connected in parallel first, and then Then connect the 5 parallel cells in series. In addition to the switching power supply module and output voltage conversion module welded on the main board 12 in the housing, there are also a charging circuit, a discharging circuit, a light turning circuit and an SD/MMC card reading circuit. In addition, the main board 12 is also connected to a light board 13 And the protection board 11, wherein a power indicating circuit is arranged on the light board 13, and a protection circuit is arranged on the protection board 11.

The above is a detailed introduction to the assembly structure of the present utility model, and the circuit part of the present utility model will be described below in conjunction with accompanying drawings 3 to 4 .

As shown in Figures 3 to 4, Figure 3 is a circuit diagram of the utility model, and Figure 4 is a signal flow chart of the circuit. The circuit mainly includes a charging circuit, a discharging circuit, a protection circuit, a light turning circuit, a power indicator circuit and an SD/MMC card reading circuit. The charging circuit is essentially a step-down circuit, which supplies power to the circuit through an external power supply, and adjusts the entire circuit through the switching power supply control chip TL494, thereby realizing a constant current and constant voltage control process. TL494 is a fixed frequency pulse width modulation circuit with a built-in linear sawtooth wave oscillator. The oscillation frequency can be adjusted through the external resistor R8 and capacitor C7. A control signal is compared to achieve. When the control signal is externally input by the chip TL494, one way is sent to the dead time comparator, and the other way is sent to the input terminal of the error amplifier. After the signal is processed by the chip TL494, a constant voltage is output from pin 14 to the cell protection circuit so that To charge the battery, the battery protection circuit here is mainly used to protect the lithium battery, which is mainly realized by the protection chip ICS8254AA. The purpose of this circuit is to protect the lithium battery from being overcharged, overdischarged, overcurrent, etc. damage.

The discharge circuit is essentially a boost circuit, which is powered by the battery core to boost and output a constant voltage for external power supply. It is mainly realized by the control chip UC3843. First, the resistor R609 is connected to V _ref and the capacitor C604 Connect to ground to make UC3843 oscillation frequency and maximum duty cycle adjustable, where V _ref provides power supply current to capacitor C604 through resistor R609, and then connects resistor R611 and capacitor C606 in series with pin 1 to loop the circuit Circuit compensation, then pin 7 controls the positive power supply of the integrated circuit, and finally pin 3 samples the current and outputs it to the power indicator circuit.

The function of the power indicating circuit is to indicate the power of the battery when the battery is charging or discharging. It mainly uses the control chip LM324 to sample the current to realize the detection of the voltage of the battery cell. Among them, its detection electric quantity indicator is divided into four stages: 0%, 25%, 75%, 100%; also indicated by four LEDs: LED1, LED2, LED3, LED4.

The charging turning light control circuit mainly uses the control chip LM358 to sample the current to detect whether the battery is fully charged, and make an indication judgment on this, and the circuit detects the current of the charging circuit to control the LED to make corresponding indications. The indicator status of the LED is that the red light is on when charging, and the green light is on when the battery is fully charged.

The SD/MMC card reading circuit is a completely independent circuit that has nothing to do with the battery charging and discharging and protection circuits. The circuit completes the reading and writing of data in the SD/MMC card through a main control IC. At the same time, he is connected to the computer through the USB port to transfer data. The card reader interface is used to insert SD/MMC card.

The above described a notebook computer external battery described in the utility model has been introduced in detail. In this article, specific examples have been used to illustrate the principle and implementation of the utility model. The description of the above embodiments is only used to help understand the utility model. The core idea of the new model; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation and application scope. Utility model restrictions.

Claims (5)

1. An external battery for a notebook computer, which is composed of a shell, a main board and a battery cell built in the shell, and is characterized in that: the main board is provided with a switching power supply module for performing step-down processing on the battery cell , the switching power supply module is also connected with an output voltage conversion module, and the output voltage conversion module converts and outputs the voltage processed by the switching power supply module. 2. The laptop external battery according to claim 1, characterized in that: the main board is also provided with an SD/MMC flash memory card read and write data universal circuit module, and the housing is provided with the SD/MMC The USB port connected to the universal circuit module for reading and writing data of the MMC flash memory card and the card reader port. 3. The external battery for a notebook computer according to claim 1, wherein an output voltage shift switch connected to the output voltage conversion module is arranged on the casing. 4. The external battery for a notebook computer according to claim 1, wherein a power input interface and a power output port are also provided on the casing. 5. The external battery for a notebook computer according to claim 1, wherein a non-slip foot pad is provided at the bottom of the housing to increase friction.

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