KR930008263B1 - Power supplying apparatus for portable p.c. - Google Patents

Abstract

The power supplying apparatus includes a solar cell for converting solar energy into electric energy by using the photo-electric effect and supplying power, first and second charging/discharging means alternately charged by using the power applied from the solar cell and, if not charged, discharged to supply power, a voltage comparator, whose input ports are respectively connected to the first and second charging/discharging means, for comparing the states thereof, a first switching means connected between the solar cell and the first and second charging/discharging means for selecting one of the first and second charging/discharging means according to the inverted output of the voltage comparator and allowing the selected means to be charged with the power from the solar cell, a second switching means for selecting one of the first and second charging/discharging means unselected by the first switching means according to the output of the voltage comparator and allowing the selected charging/dicharging means to supply power to the system.

Description

Laptop power supply

1 is an external view showing a state of use of an embodiment of a laptop computer to which the present invention is applied.

2 is a block diagram showing a schematic configuration of a power supply apparatus according to the present invention.

3 is a circuit diagram illustrating an exemplary configuration of a power supply apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

1,11 Cell 2: LCD

3: keyboard 4: system body

12: charging circuit 13: battery

14: system 21: voltage comparator

24: system power converter SW1, SW2: switch

D1, D3: Zener Diodes D2, D4: Diodes

B1, B2: Battery R1 to R4: Resistance

G1: Inverter

The present invention relates to a power supply device for a laptop computer (LAP TOP COMPUTER or NOTEBOOK PC), and more particularly, to a power supply device for a portable computer using a solar cell.

Conventional laptops use about 3 kg of built-in battery to supply the system with the necessary power. The battery's operating life is not only 5 to 6 hours, but also heavy and bulky. There has been a problem that there is a huge obstacle in miniaturizing and lightweighting a personal computer.

The present invention devised to solve the above problems by using a solar cell (Solar Cell) by supplying power while alternately charging the battery for driving the entire system, to increase the battery operating time, easy to carry a portable computer It is an object of the present invention to provide a power supply that can be miniaturized and lightweight.

In order to achieve the above object, the present invention provides a power supply for supplying power to a laptop computer, comprising: a solar cell for converting solar energy into electrical energy using a photoelectric effect to provide a predetermined power source; First and second charging and discharging means which are alternately charged using the power applied from the solar cell, and supply power while discharging when uncharged; Voltage comparing means for comparing two states of the first and second charging and discharging means, one input terminal being connected to each of the first and second charging and discharging means; Is connected between the solar cell and the first and second charging and discharging means, selects one of the first and second charging and discharging means according to the inverted output of the voltage comparing means, and supplies power from the solar cell First switching means for receiving and charging; And two selection input terminals connected to the first and second charging and discharging means, and control terminals connected to one output terminal of the voltage comparing means, respectively, according to the output of the voltage comparing means. And a second switching means for selecting the other one not selected by the first switch means and connecting the selected charge / discharge means to supply power to the system.

Further, in the power supply of the portable computer, the second switching means is characterized in that the electronic switching relay is configured so that the power is not short-circuited at the switching moment.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is an external view showing an embodiment using a laptop computer according to the present invention, in which 1 is a solar cell, 2 is a liquid crystal display (LCD), 3 is a keyboard, and 4 is a system body. .

The laptop computer to which the present invention is applied is constructed by attaching the solar cell 1 to the periphery of the LCD 2 and the case of the laptop computer, as shown in the figure.

Figure 2 is a block diagram showing a schematic configuration of a power supply according to the present invention, 11 is a solar cell, 12 is a charging circuit, 13 is a battery, 14 is a system.

The power supply device according to the present invention is configured by connecting the charging circuit 12 to the solar cell 11 and the battery 13 to the charging circuit 12 as shown in the drawing. Then, power is supplied from the solar cell 11 attached to the outside of the laptop or the case to charge the battery 13 through the charging circuit 12, and the charged battery 13 drives the entire system 14. Let's do it.

3 is a circuit diagram illustrating an example of a detailed configuration of a power supply apparatus according to the present invention, wherein SW1 and SW2 are switches, 21 is a voltage comparator, 24 is a system power converter, D1 to D4 are diodes, B1 and B2. Is a battery, R1 to R4 are resistors, and G1 is an inverter.

As shown in the drawing, the power supply device according to the present invention converts solar energy into battery energy using a photoelectric effect to connect a switch (SW1) to the solar cell 11 that provides a predetermined power, the switch One end of SW1 connects the anode of the zener diode D1 connected in series with the diode D2, and the other end of the switch SW1 connects the anode of the zener diode D3 connected in series with the diode D4. do. In the cathode of the two diodes D2 and D4, batteries B1 and B2 are connected one by one, and a line to which the diode D2 and the battery B1 is connected, and the diodes D4 and B2 are connected. Each connected line is connected to each of the voltage-divided resistor terminals R1 + R2 and R3 + R4 connected in series having the same resistance values (R1 = R3 and R2 = R4). Then, the two input terminals of the voltage comparator 21 are connected between the resistors connected to the voltage dividing resistors R1 + R2 and R3 + R4, respectively.

In addition, the two lines between the diodes D2 and D4 and the batteries B1 and B2 are directly connected to two selection input terminals of the switch SW2 for supplying power to the system power converter 24, and the switch SW2. The control terminal for controlling the switching operation of) is connected to one output terminal of the voltage comparator 21.

In addition, an output terminal of the voltage comparator 21 connected to the control terminal of the switch SW2 is connected to an input terminal of the inverter G1 for inverting the output signal so that the same signal is applied, and the output terminal of the inverter G1 is again The control terminal of the switch SW1 connected to the solar cell 11 is connected. On the other hand, the other one output terminal of the voltage comparator 21 is configured by connecting to the system power converter (24).

Therefore, the path of the power applied from the solar cell 11 is set according to the switching operation of the switch SW1, and the two batteries B1 and B2 are selectively supplied with power to be charged. In this way, the battery is charged to one of the two batteries B1 and B2. At this time, the other battery which is not selected by the switch SW1 and is not supplied with power from the solar cell 11 is also charged. It is discharged through another switch SW2 to supply power to the system.

Here, the operation of the switches SW1 and SW2 for controlling the two batteries B1 and B2 to be alternately charged and discharged is performed by the voltage comparator 21. That is, the partial pressure applied to the resistor R2 of the resistor terminal R1 + R2 connected to the battery B1 and the partial pressure applied to the resistor R4 of the resistor terminal R3 + R4 connected to the battery B2 are compared. Then, the higher voltage is selected through the switch SW2, so that the high voltage battery is connected to the system to supply power. On the contrary, the lower side of the voltage is connected to the solar cell 11 to supply power from the solar cell 11 according to the selection operation of the switch SW1 by the signal inverted by the inverter G1. It will be charged.

In addition, the voltage comparator 21 displays the power supply state outside the system through a status indicator.

The two switches SW1 and SW2 are each composed of a switching relay. In particular, the switch SW2 must supply power to the system so that the power is not shorted at the moment of switching. It is preferable to use.

The present invention configured and operated as described above allows continuous charging using a solar cell instead of a battery used for power supply of a laptop computer, thereby increasing the operation time and continuously recharging a large amount of the battery. Since the battery is unnecessary, it has the effect of reducing the weight and size of the system.

Claims (2)

A power supply for supplying power to a laptop, comprising: a solar cell (11) for converting solar energy into electrical energy using a photoelectric effect to provide a predetermined power; First and second charging and discharging means (B1, B2) which are alternately charged using the power applied from the solar cell 11 and supply power while discharging when not charged; Voltage comparison means (21) for comparing two states of the first and second charging and discharging means (B1, B2), one for each of the input terminals, and comparing the states of the first and second charging and discharging means (B1, B2); It is connected between the solar cell 11 and the first and second charging and discharging means (B1, B2), according to the inverted output of the voltage comparing means 21, the first and second charging and discharging means (B1, First switching means (SW1) for selecting any one of B2) and receiving power from the solar cell (11); And two selection input terminals are input to the first and second charging and discharging means B1 and B2, and a control terminal is connected to one output terminal of the voltage comparing means 21, respectively, to output the voltage comparing means 21. According to the first and second charging and discharging means (B1, B2) of the other one that is not selected by the first switching means (SW1) to connect the selected charging and discharging means to supply power to the system And a switching means (SW2). 2. The power supply of a portable computer according to claim 1, wherein the second switching means (SW2) is constituted by an electronic switching relay which prevents a short circuit of power at the instant of switching.