JPH099624A - Ac adaptor for notebook-type personal computer - Google Patents

Abstract

PURPOSE: To obtain an AC adaptor by which a built-in battery is charged at a maximum charging current value by a method wherein, when a current from a constant-current operation part is sent to a DC output connector, a current value is detected by a current detection part so as to be fed back to the constant-current operation part and a current from the current detection part is supplied to a notebook-type personal computer body. CONSTITUTION: An AC voltage from an AC power supply 10 is input to a voltage conversion part 2 so as to be converted into a DC voltage, its output is converted into two kinds of DC currents by a constant-current operation part 4, and one kind of DC current out of them is input to a current detection part 3 by a signal from the outside. The DC current at this time is sent to a DC output connector 5, and the current value of the DC current is detected by the current detection part 3 so as to be fed back to the constant-current operation part 4. Then, a current from the current detection part 3 is supplied to a notebook-type personal computer body 11 via a DC input connector 12. Thereby, a built-in battery 18 can be always charged at a maximum charging current value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC for a notebook computer for connecting to the notebook computer main body, converting AC power from an AC power source into DC power and supplying the DC power to a load or a built-in battery of the notebook computer. Regarding the adapter.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing an example of a conventional AC adapter for a notebook computer, which is shown together with the notebook computer main body.

A conventional AC adapter 31 for a notebook computer, which is connected to the notebook computer main body and converts AC power from an AC power source into DC power and supplies the DC power to a load or a built-in battery of the notebook computer, is shown in FIG. As shown in FIG. 3, a voltage conversion unit 32 that inputs an AC voltage from the AC power supply (AC power supply) 10 and converts it into a DC voltage, and a voltage conversion unit 32.
Constant current operating unit 34 for converting the output of the above into a direct current, and the output current from the constant current operating unit 34 to the notebook computer main body 41
DC output connector (DC output connector) 35
And a signal input connector 37 for inputting a signal from the notebook computer main body 41 and transmitting it to the constant current operation unit 34.

The notebook computer main body 41 has a DC input connector (DC) for inputting a current from the DC output connector 35.
Input connector) 42, a diode 43 that allows the current from the DC input connector 42 to pass in only one direction, a battery charging switch 46 that turns on and off the supply of the current that has passed through the diode 43 to the built-in battery 48, and a built-in battery 48.
A diode 45 that allows the current from the device to pass in only one direction
The load connection switch 47 for turning on and off the supply of the current passing through the diode 43 or the diode 45 to the load 47, the control unit 49 for controlling the operations of the battery charging switch 46 and the load connection switch 47, and the operation of the control unit 49. Main body on / off switch 50 for instructing and control unit 4
A signal output connector 51 for transmitting the signal from the AC adapter 9 to the signal input connector 37 of the notebook computer AC adapter 31.

AC for a notebook computer configured as described above
The adapter 31 connects the voltage conversion unit 32 to the AC power supply 10 and the DC output connector 35 to the DC input connector 42 of the notebook computer main body 41, so that the output current from the constant current operation unit 34 is changed to the DC output connector. 35 and D
Notebook PC main body 41 via C input connector 42
To supply.

At this time, when the main body on / off switch 50 of the notebook personal computer main body 41 is turned on, the control unit 49 opens the battery charging switch 46 and closes the load connection switch 47, so that the direct current supplied from the DC input connector 42 , And is supplied to the load 47 via the diode 43.
Further, when the main body on / off switch 50 is turned off, the control unit 49 closes the battery charge switch 46 and opens the load connection switch 47, so that the direct current supplied from the DC input connector 42 passes through the diode 43 and the built-in battery 48. To charge the built-in battery 48.

When the DC output connector 35 and the DC input connector 42 are separated and the main body on / off switch 50 is turned on, the control section 49 closes the load connection switch 47, so that the current from the built-in battery 48 passes through the diode 45. It is supplied to the load 47.

When the built-in battery 48 is a nickel-cadmium battery or a nickel-hydrogen battery, the maximum charging current supplied from the notebook computer AC adapter 31 to the built-in battery 48 is the load 47 with respect to the characteristics of these batteries. The current has a larger value than the supplied current. Therefore, depending on the type of the built-in battery 48 and the size of the load 47, the built-in battery 4
8 loads a current of a value smaller than its maximum charging current 47
When supplying the current to the load 47, the AC adapter 31 for the notebook computer has a function of supplying the load 47 with a current having a value smaller than the maximum charging current of the internal battery 48.
It has a function of holding the maximum charging current value of 8 and supplying it to the built-in battery 48, and it is necessary to switch them.

Therefore, the signal output connector 5 for transmitting the signal from the control section 49 to the notebook computer main body 41.
1 is provided, and this is connected to the signal input connector 37 of the AC adapter 31 for a notebook computer, the main body on / off switch 50 is turned off, and the load connection switch 47 is opened,
By transmitting a signal from the control unit 49 of the notebook computer main body 41 to the constant current operating unit 34 of the AC adapter 31 for the notebook computer to operate the constant current operating unit 34, the output current of the constant current operating unit 34 becomes the internal battery. The battery charging switch 46 is closed so that the maximum charging current value of 48 is held. This allows the built-in battery 48 to be charged with the maximum charging current value.

[0010]

The conventional AC adapter for notebook computer as described above has a function of supplying the load with a current having a value smaller than the maximum charging current of the built-in battery, and the maximum charging current of the built-in battery. When switching between the function that holds the value and supplies it to the built-in battery, connect the signal output connector of the laptop computer and the signal input connector of the AC adapter for the laptop computer, and input the signal from the control unit of the laptop computer to the notebook. It must be transmitted to the constant current operation unit of the AC adapter for personal computer to operate the constant current operation unit. In this case, if there is a problem in the connection between the signal output connector and the signal input connector, the constant current operation unit Since the switching operation is not performed, there is a problem that it becomes impossible to perform charging with the maximum charging current value of the built-in battery.

[0011]

The first AC adapter for a notebook computer according to the present invention comprises two types of voltage converters for inputting an AC voltage from an AC power source and converting it to a DC voltage, and two outputs of the voltage converters. Constant current operating unit for converting into a DC current having the value of, and outputting one kind of DC current among them by a signal from the outside, and sending the current from the constant current operating unit to the DC output connector and the current value at that time. And a DC output connector for supplying the current from the current detecting unit to the notebook computer main body.

The second AC adapter for notebook computer according to the present invention comprises a voltage conversion unit for inputting an AC voltage from an AC power supply and converting it into a DC voltage, and an output of the voltage conversion unit into a DC current having two kinds of values. One of them converted by the signal from the outside
A constant current operation unit that outputs a direct current of a kind, a current detection unit that sends a current from the constant current operation unit to a DC output connector and that detects the current value at that time, and a signal from the current detection unit that is input A current detection time adjustment unit that sends a signal to the constant current operation unit after a predetermined time has elapsed, and the DC output connector that supplies the current from the current detection unit to the notebook computer body.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention.

In FIG. 1, an AC adapter 1 for a notebook computer has two types of outputs, that is, a voltage conversion section 2 for inputting an AC voltage from an AC power supply (AC power supply) 10 and converting it to a DC voltage. A constant current operating unit 4 that converts the value into a DC current and outputs one kind of DC current in response to an external signal, and sends the current from the constant current operating unit 4 to a DC output connector (DC output connector) 5. At the same time, a current detection unit 3 that detects the current value at that time and feeds back to the constant current operation unit 4 and a DC that supplies the current from the current detection unit 3 to the notebook computer main body 11 via the DC input connector 12
And an output connector 5.

The structure of the notebook personal computer main body 11 is the same as that of the notebook personal computer main body 41 shown in FIG. 3 except that there is no signal output connector for transmitting a signal from the control unit 19 to the constant current operation unit 4 of the notebook personal computer AC adapter 1. Is the same as.

Next, the operation of the notebook computer AC adapter 1 configured as described above will be described.

The AC adapter 1 for a notebook computer connects the voltage conversion section 2 to the AC power source 10, and the DC output connector 5
Is connected to the DC input connector 12 of the notebook computer main body 11, the output current from the constant current operation unit 4 is
The current is supplied to the notebook computer main body 11 via the current detection unit 3, the DC output connector 5 and the DC input connector 12.

At this time, when the main body on / off switch 20 of the notebook personal computer main body 11 is turned on, the controller 19 opens the battery charging switch 16 and closes the load connection switch 17, so that the direct current supplied from the DC input connector 12 , And is supplied to the load 17 via the diode 13.
Further, when the main body on / off switch 20 is turned off, the control unit 19 closes the battery charging switch 16 and opens the load connection switch 17, so that the direct current supplied from the DC input connector 12 passes through the diode 13 and the built-in battery 18 Is supplied to charge the built-in battery 18.

DC output connector 5 and DC input connector 1
When the main body on / off switch 20 is turned on by separating from 2, the control unit 19 closes the load connection switch 17,
The current from the built-in battery 18 is supplied to the load 17 via the diode 15.

When the built-in battery 18 is a nickel-cadmium battery or a nickel-hydrogen battery, the internal resistance of the batteries is the load 17.
The current supplied to the built-in battery 18 is larger than the current supplied to the load 17 because the resistance is smaller than the equivalent resistance of Therefore, the current detection unit 3 detects whether or not current is supplied to the built-in battery 18 or the load 17 in the notebook computer main body 11 by detecting the current value passing through the inside. Can be determined. The current detection unit 3 feeds back the detection result to the constant current operation unit 4, and the constant current operation unit 4 holds the maximum charging current when the current is supplied to the built-in battery 18. Operates to perform constant current charging.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

In FIG. 2, an AC adapter 21 for a notebook computer has two types of outputs, a voltage conversion unit 22 for inputting an AC voltage from an AC power supply (AC power supply) 10 and converting it to a DC voltage. A constant current operating unit 24 that converts the value into a DC current and outputs one kind of DC current in response to an external signal, and sends the current from the constant current operating unit 24 to a DC output connector (DC output connector) 25. At the same time, the current detection unit 23 that detects the current value at that time and sends it to the current detection time adjustment unit 26, and the current that sends a signal to the constant current operation unit 24 after a certain time from the input of the signal from the current detection unit 23 The current from the detection time adjustment unit 26 and the current detection unit 23 is passed through the DC input connector 12 to the main body 11 of the notebook computer.
And a DC output connector 25 for supplying

The notebook computer body 11 is the same as the notebook computer body of FIG.

The difference between the operation of this embodiment and the embodiment of FIG. 1 is that the signal from the current detector 23 is directly applied to the constant current operation unit 2.
4 is sent to the constant current operation unit 24 via the current detection time adjustment unit 26. Current detection time adjustment unit 26
Sends a signal to the constant current operating unit 24 after a certain time has elapsed since the signal was input from the current detecting unit 23, so that when the current fluctuation of the load 17 occurs within the certain time, the constant current operating unit 24 It is possible to prevent a reaction from causing a malfunction.

[0026]

As described above, in the AC adapter for a notebook computer of the present invention, a voltage conversion unit for inputting an AC voltage from an AC power source and converting it into a DC voltage, and an output of the voltage conversion unit have two kinds of values. A constant voltage operation unit for converting into a DC current of 1 and outputting a DC current of one of them according to a signal from the outside,
DC output that supplies the current from the constant current operation part to the DC output connector, detects the current value at that time and feeds back to the constant current operation part, and supplies the current from the current detection part to the laptop computer By providing the connector, the signal from the control unit of the laptop computer can be connected to the signal output connector of the laptop computer and the signal input connector of the laptop computer AC adapter to be the constant current operation unit of the laptop computer AC adapter. Since there is no need to transmit the constant current operation part to operate, the constant current operation part does not stop operating due to the connection failure of the signal output connector and the signal input connector, and the maximum charging current of the built-in battery is always maintained. There is an effect that it becomes possible to charge depending on the value. Further, by providing a current detection time adjustment unit between the current detection unit and the constant current operation unit and delaying a signal sent to the constant current operation unit for a certain time, when a load current fluctuation occurs within a certain time, There is an effect that it is possible to prevent the current operation unit from reacting to it and causing a malfunction.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention.

FIG. 2 is a block diagram showing a second embodiment of the present invention.

FIG. 3 is a block diagram showing an example of a conventional AC adapter for a notebook computer.

[Explanation of symbols]

1.21, 31 AC adapter for notebook PCs 2.22, 32 Voltage conversion section 3.23 Current detection section 4 / 24.34 Constant current operation section 5.25.35 DC output connector (DC output connector) 10 AC power supply ( AC power supply) 11.41 Notebook PC body 12.42 DC input connector (DC input connector) 13.15.43.45 Diode 14.44 Load connection switch 16.46 Battery charging switch 17.47 Load 18.48 Built-in battery 19・ 49 Control unit 20 ・ 50 Main unit on / off switch 26 Current detection time adjustment unit 37 Signal input connector 51 Signal output connector

Claims (2)

[Claims] 1. A voltage conversion unit for inputting an AC voltage from an AC power supply and converting it to a DC voltage, and an output of the voltage conversion unit is 2
A constant current operation unit for converting into a direct current of a seed value and outputting one kind of direct current among them in response to an external signal, and sending the current from the constant current operation unit to a direct current output connector and the current at that time An AC adapter for a notebook computer, comprising: a current detecting unit that detects a value and feeds back to the constant current operating unit; and the DC output connector that supplies the current from the current detecting unit to the notebook computer main body. 2. A voltage conversion unit for inputting an AC voltage from an AC power supply and converting it into a DC voltage, and an output of the voltage conversion unit
A constant current operation unit for converting into a direct current of a seed value and outputting one kind of direct current among them in response to an external signal, and sending the current from the constant current operation unit to a direct current output connector and the current at that time A current detection unit that detects a value, a current detection time adjustment unit that sends a signal to the constant current operation unit after a certain period of time after the signal from the current detection unit is input, and a current from the current detection unit that is a laptop computer. An AC adapter for a notebook computer, comprising the DC output connector supplied to the main body.