JPH05168149A - Information processor provided with ac adapter - Google Patents

Abstract

PURPOSE:To provide an information processor in which the voltage can be regulated on AC adapter side so long as the power consumption is within an allowable range even if a load side device has a different voltage. CONSTITUTION:When power is fed from an AC input power supply 1 to a switching regulator 6 in an AC adapter 2 and a DC feeder line 21, a ground signal line 20 and voltage code signal lines 11-19 are connected with a DC/DC converter 9 and a voltage code setting circuit 7, a preset logic value is delivered from the voltage code setting circuit 7 through the voltage code signal lines 11-19 to a control circuit 4. A D/A converter 5 then delivers a reference voltage to the switching regulator 6 based on the logic value fed to the control circuit 4. If the set voltage is within a predetermined range, the control circuit 4 delivers a control signal on a control line 22 and power is fed to the DC/DC converter 9 and thereby a switch 10 is turned ON to operate an information processor 3. Consequently, a secondary battery 8 is charged regardless of the switch 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to power supply of an information processing apparatus with an AC adapter, and more particularly to an information processing apparatus with an AC adapter in a portable information processing apparatus.

[0002]

2. Description of the Related Art Conventionally, in a portable information processing apparatus of this type, as shown in FIG. 3, when used on a desk, a switching regulator 106 is set to a reference voltage 104 by power supply from an AC input power supply 1. Information processing device 1
The switch 10 of 03 is turned on to supply power to the DC / DC converter 109.

[0003] Alternatively, it is generally operated by a built-in secondary battery 8 when it is carried, and the output voltage of the AC adapter 102 differs depending on the configuration of the built-in secondary battery 8 whose required voltage on the device side is different. The specifications are often different.

[0004]

In the information processing apparatus with the AC adapter described above, there are cases where the AC adapter is used as a power source for operation and cases where a secondary battery is built in. The charging of the secondary battery requires the AC adapter. It is usually done by connecting.

Further, since the structure of the secondary battery is restricted by the structure of each model and the same structure cannot be used, the output voltage is changed and the AC adapter is redesigned.

However, since the AC adapter uses a commercial AC power supply as an input, it takes a period to solve problems in procedure and technology in order to obtain the safety standard of each country of sale.
It missed the sales period and required extra development costs.

Therefore, an object of the present invention is to provide an information processing apparatus with an AC adapter which automatically adjusts the voltage on the AC adapter side if the power consumption is within an allowable range even if the load side apparatus has different voltage specifications. Is.

[0008]

[Means for Solving the Problems] Therefore, in order to achieve the above-mentioned object, the information processing apparatus with an AC adapter of the present invention includes a DC / DC converter that generates a desired DC voltage from a DC input voltage, and this desired information processing apparatus. An information processing device having a voltage code setting circuit for setting a digital code corresponding to a DC voltage, a switching regulator for generating a predetermined DC output voltage from an AC input power supply, and the digital code for a driving voltage range of the switching regulator And a control circuit that determines whether the digital code is within the drive voltage range of the switching regulator, the control circuit converts the digital code into an analog voltage, and outputs the analog voltage. D for controlling the DC output voltage to be supplied to the DC / DC converter In an AC adapter and an A converter, characterized in that it is configured. Also, in the information processing apparatus with AC adapter of the present invention, when the digital code is out of the drive voltage range of the switching regulator, an abnormal signal is generated from the control circuit, and a display is made based on the abnormal signal. It is characterized in that a display means is provided.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

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

As shown in FIG. 1, the information processing apparatus with an AC adapter of the present invention has an AC input power source 1 which is a commercial power source.
And whether the switching regulator 6, which generates a predetermined DC output voltage from the AC input power supply 1, the D / A converter 5, which converts the digital code into an analog voltage, is within the drive voltage range of the switching regulator 6, AC adapter 2 with control circuit 4 for judging
And a switch 1 for turning on / off the power of the information processing device 3.
0, DC / which generates the desired DC voltage from the DC input voltage
The information processing apparatus 3 includes a DC converter 9, a secondary battery 8 as a battery driving power source, and a voltage code setting circuit 7 for setting a digital code corresponding to a desired DC voltage.

Further, as shown in the circuit diagram of the voltage code setting circuit and the control circuit of the embodiment of the present invention shown in FIG. 2, the control circuit 4 is connected to the voltage code signal lines 11 to 18, respectively, and NOR gates are connected to each other. NOR gate IC1 for sending a digital code to the D / A converter 5 via the output lines 30 to 37.
~ IC8, an inverter I connected to the voltage code signal line 19 for detecting whether or not the voltage code signal lines 11 to 18 are connected
C9, a pulse generation circuit 40 which is connected to the voltage code signal line 19 and outputs a code latch pulse to the D / A converter 5 via the OR gate output line 38 when the voltage code signal lines 11 to 18 are not connected, The minimum voltage setting circuit 41 for setting the voltage value, the output of the minimum voltage setting circuit 41 and N
Comparator IC10 for comparing with the outputs of OR gates IC1 to IC8, maximum voltage setting circuit 4 for setting the maximum voltage value
2, output of maximum voltage setting circuit 42 and NOR gate IC1
A comparator IC12 that performs comparison with the output of IC8, OR gate IC11 that outputs a control signal from the output of comparator IC10 to AND gate IC14, and A from comparator IC12
OR gate I for outputting a control signal to the ND gate IC14
C13, OR gates IC11 and IC13, and an AND gate IC14 that sends a control signal through the control line 22 by the output signals of the inverter IC9, comparators IC10 and I
An abnormal signal is generated by the output signal of C12.
OR gate IC15 and OR gate IC1 for sending to 16
NAND gate IC1 for sending an abnormal signal to the light emitting diode LED based on the output signal of the inverter 5 and the inverter IC9.
6. The NAND gate IC 16 is composed of a light emitting diode LED as a display means for displaying an abnormality, and the voltage code setting circuit 7 is set by a negative logic to prevent the output voltage of the switching regulator 6 from being high voltage, and the voltage code is set. The jumper pins 70 to 77 are connected to the signal lines 11 to 18, respectively.

The operation of the information processing apparatus with an AC adapter of the present invention will be described below with reference to FIGS. 1 and 2.

First, power is supplied from the AC input power supply 1 to the switching regulator 6 of the AC adapter 2, and the DC power supply line 21, the ground signal line 20, and the voltage code signal lines 11 to 19 are connected to the DC / DC converter 9. When connected to the voltage code setting circuit 7, the ground signal of the control circuit 4 returns via the ground signal line 20 and the voltage code signal line 19 to supply the logical value "0" to the NOR gates IC1 to IC8 and the inverter IC9. To be done.

As a result, in the NOR gates IC1 to IC8, the voltage code whose negative logic is set by the voltage code setting circuit 7 is positive logic and the D / A converter 5 and the comparator IC10,
12 are supplied.

For example, the jumper pins 70 to 77 are set to 0.1V for 1 bit, the minimum voltage setting circuit 41 is 10.0V, and the maximum setting voltage is 20.0V. −−−−−−−−−−−−−−−−−−−−−−−−−−−− Voltage code (negative logic 1: GND / 0: open) Set voltage 77 77 76 75 74 73 72 72 71 70 −−−−−−−−−−−−−−−−−−−−−−−−−−− 0 0 0 0 0 0 0 0 0 0 0 0 V 0 0 0 0 0 0 0 0 0 1 0.1V 0 0 0 0 0 0 1 0 0.2V ・ ・ ・ ・ ・ ・ ・ ・ ・ 0 0 1 1 0 0 1 0 0 10.0V ・ ・ ・ ・ ・ ・ ・ ・ 1 0 0 1 1 0 1 1 0 15.0V ・ ・ ・・ ・ ・ ・ ・ ・ 1 1 0 0 1 1 0 0 0 20.0V ・ ・ ・ ・ ・ ・ ・ ・ 1 1 1 1 1 1 1 1 1 25.5V −−−−−−−−−−−−−−−− -------------------- Here, according to FIG. 2, the jumper pins 70 to 77 have a set voltage of 15.0 V and a voltage code of "1001011."
The value represented by 0 "is used for the D / A converter 5 and the comparator IC.
Given to 10,12.

Further, the minimum voltage setting circuit 41 is 10.0
V (voltage code “01100100”), maximum voltage setting circuit 42 is 20.0V (voltage code “1100100”)
0 "), the comparator IC10 outputs B (minimum voltage value) <A (output value of the voltage code setting circuit) is logical "1", and the comparator IC12 outputs C (maximum voltage value)> A
The output of (the output value of the voltage code setting circuit) becomes the logic "1", and the respective outputs are OR gates IC11 and IC13.
Is supplied to the AND gate IC14 via.

Since the other input of the AND gate IC14 is connected to the voltage code signal line 19 via the inverter IC9, it becomes a logic "1", and the AND gate IC1
The logic "1" of the output of 4 is sent to the switching regulator 6 through the control line 22, and the switching regulator 6 becomes operable.

On the other hand, the pulse generation circuit 40 also has the above-mentioned A
The logic "1" of the output of the ND gate IC14 is supplied, and the voltage code latch pulse is sent to the D / A converter 5 through the NOR gate output line 38 while the logic "1" is supplied. The voltage code “10010110” is set in the internal register of the D / A converter 5.

Therefore, the D / A converter 5 has a voltage of 15.0V.
By outputting the reference voltage corresponding to the above from the D / A converter 5 and supplying it to the switching regulator 6, power is supplied to the DC / DC converter 9 through the DC power supply line 21 and the switch 10 is turned on. Information processing device 3
Or the secondary battery 8 is charged and trickle charged regardless of whether the switch 10 is on or off as long as a predetermined output is supplied from the AC adapter 2.

Second, when the set voltage set by the voltage code setting circuit 7 exceeds the set voltages of the minimum voltage setting circuit 41 and the maximum voltage setting circuit 42, the comparator IC1
For 0, the output of B (minimum voltage value)> A (output value of the voltage code setting circuit) is logic “1”, and for the comparator IC12, the output of C (maximum voltage value) <A (output value of the voltage code setting circuit) Becomes a logic "1", and each output turns on the light emitting diode LED via the OR gate IC15 and the NAND gate 16 to display an abnormality.

Further, the logic "0" of the output of the AND gate IC14 is sent to the switching regulator 6 through the control line 22, and the switching regulator 6 remains off.

Thirdly, power is supplied from the AC input power supply 1 to the switching regulator 6 of the AC adapter 2, and the DC power supply line 21, the ground signal line 20 and the voltage code signal lines 11 to 19 are connected to the DC / DC converter 9 and If not connected to the voltage code setting circuit 7, the inverter IC 9
Input becomes logic "1", output becomes logic "0", AND
The logic “0” of the output of the gate IC 14 is sent to the switching regulator 6 via the control line 22, the switching regulator 6 remains off, and the NAND gate 16
Output becomes logic "1" and the light emitting diode LED does not light.

On the other hand, the pulse generation circuit 40 also has the above-mentioned A
The logic "0" of the output of the ND gate IC14 is supplied, and the logic "1" of the input of the inverter IC9 is supplied. While the logic "1" is supplied, the voltage code latch pulse outputs the NOR gate output. It is sent to the D / A converter 5 via the line 38, and the voltage code "00000000" is set in the internal register of the D / A converter 5.

FIG. 3 is a block diagram showing a conventional example.

First, when the conventional information processing apparatus with an AC adapter is used on a desk, the switching regulator 106 of the AC adapter 102 is set at the reference voltage 104 by the power supply from the AC input power source 1, and the information processing apparatus 103 is provided. The switch 10 is turned on to supply power to the DC / DC converter 109.

Alternatively, when carried, it is generally operated by the built-in secondary battery 8, and the output voltage of the AC adapter 102 differs depending on the configuration of the built-in secondary battery 8 whose required voltage on the device side is different. The specifications are often different.

[0029]

As described above, according to the information processing apparatus with the AC adapter of the present invention, even if the load side apparatus uses different voltages, if the power consumption is within the allowable range, the AC adapter side automatically adjusts the voltage. By utilizing the already developed AC adapter, it is possible to reduce the period and development cost for solving the procedure and technical problems for acquiring the safety standards of each country of sale, and secure the sales period. Has the effect of

[Brief description of drawings]

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

FIG. 2 is a circuit diagram of a voltage code setting circuit and a control circuit according to an embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional example.

[Explanation of symbols]

 1 AC Input Power Supply 2, 102 AC Adapter 3 Information Processing Device 4 Control Circuit 5 D / A Converter 6 Switching Regulator 7 Voltage Code Setting Circuit 8 Information Processing Device (Secondary Battery) 9,109 DC / DC Converter 10 Information Processing Device ( Switch) 11 to 19 Voltage code setting circuit (voltage code signal line) 20 Voltage code setting circuit (ground signal line) 21 Switching regulator (DC power supply line) 22 Control circuit (control line) 23 D / A converter (reference voltage supply) Line) 30 to 38 control circuit (NOR gate output line) 40 control circuit (pulse generation circuit) 41 control circuit (minimum voltage setting circuit) 42 control circuit (highest voltage setting circuit) 70 to 77 voltage code setting circuit (jumper pin) IC1 to IC8 control circuit (NOR gate) IC9 control circuit (inverter) IC10, 12 control circuit (comparator) IC11, 13, 15 control circuit (OR gate) IC14 control circuit (AND gate) IC16 control circuit (NAND gate) LED control circuit (light emitting diode)

Claims (2)

[Claims] 1. An information processing apparatus having a DC / DC converter for generating a desired DC voltage from a DC input voltage, and a voltage code setting circuit for setting a digital code corresponding to the desired DC voltage, and an AC input power supply. A switching regulator that generates a predetermined DC output voltage from the control circuit, a control circuit that determines whether the digital code is within the drive voltage range of the switching regulator, and a control circuit that drives the digital code to drive the switching regulator. And a D / A converter that converts the digital code into an analog voltage only when it is determined to be within the voltage range, and controls the DC output voltage to be supplied to the DC / DC converter by the analog voltage. Information with an AC adapter characterized by being configured with an AC adapter Management apparatus. 2. A display means is provided for generating an abnormal signal from the control circuit when the digital code is out of the drive voltage range of the switching regulator, and displaying based on the abnormal signal. An information processing apparatus with an AC adapter according to claim 1.