JPH05137276A - Charging device for electronic apparatus - Google Patents

Abstract

PURPOSE:To make it possible to perform power feeding for operating an electronic apparatus and charge a battery at the same time without increasing the rated power of an AC adapter. CONSTITUTION:This equipment comprises a current detection circuit 2-8 for detecting the operating current of an electronic apparatus 2 being fed from an AC adopter 1, arithmetic operation means for subtracting an operating current detected from a rated current of the AC adopter by a current detection circuit 28 and calculating the difference and a charging circuit 2-9 equipped with arithmetic operation and control functions including charge current control means for controlling a current being charged to a battery 2-2 from a power source fed by the AC adopter 1, to the current value equal to the difference calculated by the arithmetic operation means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device for electronic equipment for charging a storage battery built in the electronic equipment.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing a configuration of a conventional electronic device charging apparatus. In the figure, 1 is an AC adapter that supplies power for the operation of an electronic device and charging of a storage battery, 2B is an electronic device represented by a personal computer or a word processor including a conventional charging circuit, 2-
1 is a connector for connecting the AC adapter 1 to the electronic device 2B, 2-2 is a storage battery for supplying power to the electronic device from the charged energy when the electronic device is operated without connecting the AC adapter 1, 2-3 And 2-4 are switching diodes for supplying power to the DC power supply circuit from either the AC adapter 1 or the storage battery 2-2, and 2-5.
Is a power switch arranged at the inputs of the DC power supply circuit and the charging circuit and operating in conjunction with each other. 2-6A is a DC power supply circuit that stably supplies a plurality of DC voltages required for the electronic equipment to operate to the control device. -7A is C for controlling the operation of the electronic device
A conventional control device including a PU, a memory, an auxiliary storage device, an input device, an output device, etc., 2-9B is a conventional charging circuit for charging the storage battery 2-2, 3 is a commercial power source (AC1
This is an AC plug that inputs 00 V) and supplies it to the AC adapter 1.

The operation of FIG. 8 will be described. First, the operation of the electronic device 2B when the AC adapter 1 is not connected to the connector 2-1 of the electronic device will be described. When the power switch 2-5 is turned on while the AC adapter 1 is not connected, the energy stored in the storage battery 2-2 is supplied to the DC power supply circuit 2-6A via the diode 2-3 and the power switch 2-5. To be done. The DC power supply circuit 2-6A generates a plurality of stabilized DC voltages required by the control device 2-7A by the power supply and supplies the stabilized DC voltage to the control device 2-7A.
The control device 2-7A operates and can execute the function of the electronic device 2B.

Next, the operation of the electronic device 2B in a state in which the AC adapter 1 supplied with the commercial power via the AC plug 3 is connected to the connector 2-1 of the electronic device will be described.
First, when the power switch 2-5 of the electronic device is off,
The output from the AC adapter 1 is supplied from the connector 2-1 to the charging circuit 2-9B through the off circuit of the power switch 2-5. At this time, if the storage battery 2-2 needs to be charged (not fully charged), the charging circuit 2-9B supplies the charging stream required for charging to the storage battery 2-2 while the voltage of the battery is being charged. The charging operation is ended by monitoring and detecting that the battery is fully charged.

Next, the state in which the power switch 2-5 is turned on will be described. When the power switch 2-5 is turned on, the output from the AC adapter 1 stops the supply to the charging circuit 2-9B, and the diode 2-4 and the power switch 2
It is supplied to the DC power supply circuit 2-6A via -5. At this time, the output from the AC adapter 1 and the output from the storage battery 2-2 are connected so as to be input in parallel via the diodes 2-4 and 2-3. Since the output voltage of the AC adapter 1 is higher than that of, the diode 2-3 does not conduct, and only the diode 2-4 conducts. Therefore, the DC power supply circuit 2-6A is supplied only from the output side of the AC adapter 1.
When power is supplied to the DC power supply circuit 2-6A, the control device 2-7A operates and the function of the electronic device 2B is executed as described above.

[0006]

However, in the conventional charging device for electronic equipment, when the AC adapter is connected to the electronic equipment, the output of the AC adapter is a DC power supply circuit for operating the electronic equipment. , Or only one of the charging circuits for charging the storage battery is supplied, and therefore the storage battery cannot be charged at the same time while operating the electronic device. Moreover, if the rated power is increased so that the sum of the maximum power consumption of the electronic device and the power required to charge the storage battery is set as the rated power of the AC adapter, the volume, weight, and cost of the AC adapter are inevitably increased. There is also a problem that it is uneconomical if the charging power is not supplied at the same time as the operating power is supplied by increasing the power consumption.

The present invention has been made in order to solve the above problems, in which power is supplied to operate an electronic device by using a conventional AC adapter without increasing the rated power of the AC adapter. An object of the present invention is to obtain a charging device for electronic equipment that can charge a storage battery at the same time.

[0008]

According to a first aspect of the present invention, there is provided a charging device for electronic equipment which charges an internal storage battery when power is supplied from an AC adapter to the electronic equipment, and the power is not supplied. In a charging device for an electronic device that sometimes supplies power to an electronic device from the storage battery, a current detection unit that detects an operating current value of the electronic device that is being supplied from the AC adapter, and the current detection unit based on a rated current value of the AC adapter. And a charging current for controlling the current for charging the storage battery from the power supply supplied by the AC adapter to a current value equal to the difference calculated by the computing means, by subtracting the operating current value detected by And a control means.

According to a second aspect of the present invention, there is provided a charging device for electronic equipment which charges an internal storage battery when power is supplied from the AC adapter to the electronic equipment, and charges the internal storage battery when the power is not supplied. In a charging device for an electronic device that supplies power to a device, charging that monitors a load state of an electronic device that is being supplied with power from the AC adapter and generates a plurality of bits of information that indicates a charging current value to the storage battery based on the load state A charging current for controlling the current for charging the storage battery from the power supply supplied by the AC adapter and the charging information value equal to the charging current value instructed by the information of the plurality of bits generated by the charging instruction information generating means. And a control means.

[0010]

According to the first aspect of the present invention, an electronic battery that charges an internal storage battery when power is supplied from the AC adapter to the electronic device and that supplies power to the electronic device from the storage battery when the power is not supplied In the device charging device, the current detecting means detects the operating current value of the electronic device being fed from the AC adapter, and the computing means subtracts the operating current value detected by the current detecting means from the rated current value of the AC adapter. Then, the difference is calculated. The charging current control means controls the current for charging the storage battery from the power supply supplied by the AC adapter to a current value equal to the difference calculated by the calculation means.

According to the second aspect of the present invention, an electronic battery that charges an internal storage battery when power is supplied to the electronic device from the AC adapter and that supplies power to the electronic device from the storage battery when the power is not supplied. In the device charger, the charging instruction information generating means monitors the load state of the electronic device that is being supplied with power from the AC adapter, and generates a plurality of bits of information indicating a charging current value to the storage battery based on the load state. .. The charging current control means controls the current for charging the storage battery from the power supply supplied by the AC adapter to a current value equal to the charging current value instructed by the information of a plurality of bits generated by the charging instruction information generating means.

[0012]

1 is a block diagram showing the configuration of a charging device for electronic equipment according to a first embodiment of the present invention. In the figure,
Reference numeral 1 is an AC adapter for supplying power when the electronic device is operating or when the internal storage battery is charged.
Although it is a 100V single phase, the output voltage and its rated current (or rated power) are determined for each connected electronic device. The output voltage of a normal AC adapter used in personal computers, word processors, etc. is, for example, DC 9V or 12V (voltage equivalent to 6 or 8 1.5V dry cells), rated current (in this case). The maximum current supplied to the connected device is often about 1.2 A, for example. Therefore, the rated power (meaning the maximum power consumption of the device) in this case is 10.8W or 1
It becomes 4.4W. Reference numeral 2 is an electronic device represented by a personal computer, a word processor, or the like having the charging device according to the first embodiment, and 3 is an AC plug.

2-1 is a connector, 2-2 is a storage battery, 2-
Reference numerals 3 and 2-4 are switching diodes, 2-5 is a power switch, 2-6A is a DC power supply circuit, and 2-7A is a conventional control circuit, which are the same as those in FIG.

Reference numeral 2-8 is a current detection circuit according to the first embodiment, in which the AC adapter 1 and the connector 2-1 are connected,
It is a circuit that detects the value of the current supplied from the AC adapter 1 to the DC power supply circuit 2-6A via the switching diode 2-4 when the power switch 2-5 is turned on. This current detection method may be a general method of detecting a voltage value generated by flowing a load current through a resistor having a precise resistance value and a small temperature coefficient. Now for example 5Ω
If the voltage value generated by the current flowing through the resistor is 6V, the current value can be immediately calculated as 6V / 5Ω = 1.2A. In this example, a voltage signal taken out from both ends of the resistor is output as a current value detection signal to the charging circuit with a calculation / control function. Also AC adapter 1
Since the output voltage of is a substantially constant voltage value such as DC 9V or 12V, it is easy to calculate the power value by multiplying the output voltage value and the detected current value. Therefore, the current detection circuit 2-8 can also be used as a power detection circuit.

Reference numeral 2-9 is a charging circuit with a calculation / control function according to the first embodiment, which subtracts the operating current value detected by the current detection circuit 2-8 from the rated current value of the AC adapter 1 and subtracts the difference. Is calculated and the charging current value when charging the storage battery 2-2 is controlled so that the charging current value becomes equal to the calculated difference.

FIG. 2 is a block diagram showing an example of the charging circuit with the arithmetic / control function of FIG. In the figure, 91 is a rated current setting device, which sets, for example, the rated current value of the AC adapter 1 as an analog voltage signal corresponding to the current value. A subtracter 92 subtracts a voltage signal indicating the operating current value input from the current detection circuit 2-8 from the set voltage signal input from the rated current setting unit 91, and uses the difference as an instruction current signal to charge the current controller. Output to. Reference numeral 93 is a charging current controller, which increases or decreases the charging current and maintains the current value so that the deviation between the instruction current signal input from the subtractor 92 and the feedback current signal fed back from the charging current detector becomes zero. A control signal such as the above is output to the charger 94.

The charger 94 of FIG. 2 determines from the storage battery voltage signal input from the storage battery 2-2 whether or not it is in a fully charged state, and when it is not in a fully charged state, the input power supplied from the AC adapter 1 is The charging current is supplied to the storage battery 2-2 via the charging current detector 95 according to the charging current value based on the control signal from the charging current controller 93. A charging current detector 95 feeds back a voltage signal generated based on the charging current to the charging current controller 93 as a feedback current signal, similarly to the current detection circuit 2-8. 2A is an input terminal from the current detection circuit 2-8, and b is the AC adapter 1
Is an input end from the storage battery 2-2, and d is an output end to the storage battery 2-2. FIG. 3 is a diagram for explaining the operation of the subtractor shown in FIG.

The operation of FIG. 1 will be described with reference to FIGS. First, the commercial power supply (AC
A case where 100 V) is supplied, its output is connected to the electronic device 2 via the connector 2-1, and the power switch 2-5 is off will be described. In this case, since the output current of the AC adapter 1 is not supplied to the DC power supply circuit 2-6A, the operating current value detected by the current detection circuit 2-8 is zero. Therefore, the subtractor 92 in the charging circuit 2-9 with a calculation / control function is the rated current value preset in the rated current setting unit 91, that is, the charging current value when the load of the electronic device of FIG. 3 is 0%. An instruction current signal corresponding to a certain 1200 mA is output. The charging current controller 93 controls the charger 94 so that a feedback current signal having a value equal to the instruction current signal is obtained. The charger 94 charges the storage battery 2-2 under the control of the charging current controller 93, and automatically stops the charging when the storage battery voltage reaches the fully charged state.

Next, the case where the power switch 2-5 is turned on will be described. When the power switch 2-5 is turned on, an operating current is supplied from the AC adapter 1 to the DC power circuit 2-6A, and the value of this operating current varies depending on the load state of the electronic device 2. When the load condition of the electronic device 2 is 30% in FIG. 3, the operating current value I ₁ of the device is 36.
A voltage signal corresponding to the operating current I ₁ of 0 mA is supplied to the subtractor 92. The subtractor 92 has a rated current of 12
A voltage signal corresponding to the storage battery charging instruction current value I ₂ = 840 mA obtained by subtracting 360 mA of I ₁ from 00 mA is supplied to the charging current controller 93.

The charging current controller 93 controls the charging current via the charger 94 so that the charging current to the storage battery 2-2 becomes 840 mA of the above-mentioned I ₂ . Then, when the control device 2-7A changes the operating current of the electronic device, such as when the floppy disk (hereinafter referred to as FD) drive device is started or stopped, the charging current value changes in response to the change in the operating current value. Is controlled so that the sum of the electronic device operating current and the charging current to the storage battery is always equal to the rated current of the AC adapter 1 (or not to exceed the rated current).
When the output voltage of the storage battery 2-2 finally reaches the fully charged state, the charger 94 automatically stops its charging operation.

FIG. 4 is a block diagram of an electronic device charging apparatus according to the second embodiment of the present invention. In the figure, 2-6 is a DC power supply circuit according to the second embodiment including a charge inhibition information generating section 61 therein. The charging prohibition information generation unit 61 only charges the charging prohibition information (“000” which will be described later) for a period in which a surge current may occur immediately after the DC power supply circuit 2-6 is powered on, that is, for a certain period after the power is turned on. 3-bit information) is generated. Reference numeral 2-7 is a control device according to the second embodiment including a charging instruction information generator 71 therein. The configuration and charging instruction information of this control device will be described with reference to FIGS. 5, 6 and Table 1.

Reference numeral 2-9A in FIG. 4 is a charging circuit with a control function according to the second embodiment, in which the charging instruction information is transmitted from the charging instruction information generating section 71 or the charging prohibition information generating section 61 to a wired OR circuit. It is a circuit that performs charging while controlling the charging current value based on the charging instruction information supplied via the path. The charging circuit with control function 2-9A will be described with reference to FIG. 2A is an electronic device according to the second embodiment,
In addition to the DC power supply circuit 2-6, the control device 2-7, and the charging circuit with control function 2-9A, the same connector 2-1 as in FIG. 1, storage battery 2-2, and switching diode 2 are provided.
-3 and 2-4, and a power switch 2-5.

FIG. 5 is a block diagram showing an example of the control device of FIG. In the figure, 71 is a charging instruction information generator, 72 is a central processing unit (hereinafter referred to as CPU), 73 is a ROM for storing a program and RA for storing data.
A storage device composed of M, 74 is an auxiliary storage device composed of an FD drive device or a hard disk drive device, etc.
5 is a keyboard for an operator to input instructions and information to the electronic device 2A, and 76 is a display device for outputting information from the electronic device 2A, for example, a liquid crystal display device. In the second embodiment, the charging instruction information generated by the charging instruction information section 71 is a 3-bit code a ₂ a ₁ a ₀ , which is shown in Table 1 below.

[0024]

[Table 1]

FIG. 6 is an explanatory diagram of the charging instruction information transmission line of FIG. Table 1 will be described with reference to FIG. First,
When the power switch 2-5 is off, the control device 2-7
Output transistor TR7 of the charging instruction information generator 71 in the
1 to TR73, and output transistors TR61 to TR63 of the charging prohibition information generator 61 in the DC power supply circuit 2-6.
Are all off, and the charging instruction information transmission line configured by the wire OR circuit of FIG.
Since the resistors R1 to R3 connected to the positive power source Vcc in A hold the H level, the 3-bit code a ₂ a
₁ a ₀ becomes “111”. In Table 1, the charging instruction information code when the power switch is off is "111", this code indicates that the operating current of the electronic device is 0%, and the charging current to the storage battery is 100% of the rated current. 1200mA
Indicates that the charging instruction current value is reached.

Next, when the power switch 2-5 is turned on,
The charging prohibition information generating unit 61 in the DC power supply circuit 2-6 has the output transistor TR6 of FIG. 6 only for a certain period after the power is turned on.
All 1 to TR63 are turned on. Therefore, all the charging instruction information transmission paths become L level, and the 3-bit code a ₂
a ₁ a ₀ becomes “000”. Table 1 shows that when the power switch is on, the operating mode of the electronic device is "0", and the charging instruction information code is "000", the operating current of the device is 100%, and the charging current to the storage battery is It shows that it is 0%. Therefore, the direct-current power supply circuit 2-6 preferentially generates the charge prohibition information "000" via the wire-or circuit for a certain period after the power is turned on.

After that, after the lapse of the certain period of time, the transistors TR61 to TR63 in the charging prohibition information generating section 61.
When all are turned off and the charging prohibition information is released, the charging instruction information generation unit 71 in the control device 2-7 causes the operation mode of the electronic device in Table 1 according to the load state (power consumption state) of the electronic device. "000" to "11" as "0" to "6"
The charge instruction information code of 0 "is generated. For the load of the electronic device, for example, the required current while the FD drive device is operating is 240 mA, which corresponds to 20% of the rated current, and the liquid crystal display device is operating. The maximum required current is 180 mA, which corresponds to 15% of the rated current, so that the required current and the ratio of the rated current to each constituent device are checked in advance, for example, when only the CPU 72 and the keyboard 75 operate. "001" as operation mode "1"
The code of the CPU 72, the keyboard 75,
In this example, when the display device 76 operates, the code of “010” is assigned as the operation mode “2”, and in this example, the load state of the electronic device is seven operation modes “0” to
It is divided into “6” and the information code “0” corresponding to each mode
00 "to" 110 "are decided.

The charging instruction information generating unit 71 decodes the start instruction and the stop instruction for each constituent device output by the CPU 72 to constantly monitor which device is currently operating, and the corresponding code indicates the charging instruction information. Output as. For example, when the currently operating devices are the CPU 72, the keyboard 75, and the display device 76, the code "01" of the operation mode "2" is given.
0 "is generated and output.

FIG. 7 is a block diagram showing an example of the charging circuit with control function shown in FIG. In the figure, R1 to R3 are 3
A resistor connecting each of the line charge instruction information transmission lines to the positive power supply Vcc, 96 is a data buffer, 97 is a table memory, and a storage battery is provided at each address using the charge instruction information code output from the data buffer 96 as address data. 2-
Data corresponding to the charging instruction current to 2 is stored in advance. Referring to Table 1, now table memory 9
Data corresponding to a charging current of 1200 mA is assigned to the address of “111” having the same address data as the charging instruction information code in 7, and data corresponding to a charging current of 1080 mA is assigned to the address of “110”. It is stored. Then, when the address data is supplied from the data buffer 96, the table memory 97 reads the data indicating the charging current value stored at the corresponding address and supplies the data to the D / A converter. Reference numeral 98 denotes a D / A converter, which converts input data into an analog voltage and supplies this to the charging current controller 93 as an instruction current signal.

93 is a charging current controller, 94 is a charger, 9
Reference numeral 5 is a charging current detector, which is exactly the same as that in FIG. Therefore, the charging current controller 93 causes the value of the instruction current signal supplied from the D / A converter 98 and the value of the feedback current signal fed hack from the charging current detector 95 to be equal to each other. 2 controls the charging current value supplied to 2. That is, the storage battery 2-2 is charged with the charging current value based on the charging instruction information. Therefore, when the charge instruction information code generated from the charge instruction information generator 71 is changed, it is immediately changed to the charge current value based on the new code. When the storage battery 2-2 is finally fully charged, the charger 94 automatically stops the charging operation.

[0031]

As described above, according to the present invention, the internal storage battery is charged when power is supplied to the electronic device from the AC adapter, and the electronic device is supplied with power from the storage battery when the power is not supplied. In the charging device for electronic equipment, the current detecting means detects the operating current value of the electronic equipment being fed from the AC adapter, and the computing means calculates the operating current value detected by the current detecting means from the rated current value of the AC adapter. Since the difference is calculated by subtraction and the charging current control means controls the current for charging the storage battery from the power supply supplied by the AC adapter to a current value equal to the difference calculated by the arithmetic means, the AC adapter. The power is supplied to the electronic device and the storage battery is charged at the same time without increasing the rated power of the device, and the electronic device is used during the charging period of the storage battery as in the past. Toka do not come, and eliminates the inconvenience, such as you can not use electronic devices and there is no AC adapter for which you have forgotten to charge the storage battery, thereby improving the efficiency of use of the storage battery.

Further, according to the present invention, the charging instruction information generating means monitors the load state of the electronic device which is being supplied with power from the AC adapter, and a plurality of bits for instructing the charging current value to the storage battery based on the load state. Information is generated, and the charging current control means sets the current for charging the storage battery from the power supply supplied by the AC adapter to a current value equal to the charging current value instructed by the multiple bit information generated by the charging instruction information generating means. Since the control is performed, the storage battery is charged by the automatically instructed charging current value without sequentially calculating the surplus power of the AC adapter in response to the load fluctuation of the electronic device fed from the AC adapter. In the same way as the above case due to the economical device, the electronic device cannot be used without the AC adapter because the storage battery is forgotten to be charged,
The inconvenience that the electronic device cannot be used during the period of charging the storage battery is eliminated, and the use efficiency of the storage battery is improved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an electronic device charging apparatus according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a charging circuit with a calculation / control function of FIG.

FIG. 3 is a diagram for explaining the operation of the subtractor shown in FIG.

FIG. 4 is a block diagram showing a configuration of an electronic device charging apparatus according to a second embodiment of the present invention.

5 is a block diagram showing an example of the control device of FIG. 4. FIG.

FIG. 6 is an explanatory diagram of a charging instruction information transmission line of FIG.

7 is a block diagram showing an example of a charging circuit with a control function shown in FIG.

FIG. 8 is a block diagram showing a configuration of a conventional electronic device charging apparatus.

[Explanation of symbols]

 1 AC Adapter 2, 2A, 2B Electronic Equipment 2-1 Connector 2-2 Storage Battery 2-3, 2-4 Switching Diode 2-5 Power Switch 2-6, 2-6A DC Power Supply Circuit 2-7, 2-7A Control Device 2-9 Charging circuit with arithmetic / control function 2-9A Charging circuit with control function 2-9B Charging circuit 3 AC adapter

Claims (2)

[Claims] 1. A charging device for an electronic device, wherein an internal storage battery is charged when power is supplied from an AC adapter to the electronic device, and electric power is supplied from the storage battery to the electronic device when the power is not supplied. A current detecting unit that detects an operating current value of the electronic device that is being fed from the adapter; and a computing unit that subtracts the operating current value detected by the current detecting unit from the rated current value of the AC adapter to calculate the difference. A charging device for electronic equipment, comprising: a charging current control unit that controls a current for charging the storage battery from a power supply supplied by the AC adapter to a current value equal to the difference calculated by the calculation unit. 2. A charging device for an electronic device, wherein an internal storage battery is charged when power is supplied to the electronic device from an AC adapter, and electric power is supplied from the storage battery to the electronic device when the power is not supplied. A charging instruction information generating unit that monitors a load state of an electronic device that is supplying power from the adapter and generates a plurality of bits of information that indicates a charging current value to the storage battery based on the load state, and a power source supplied by the AC adapter. And a charging current control means for controlling a current for charging the storage battery to a current value equal to a charging current value instructed by a plurality of bits of information generated by the charging instruction information generating means. Equipment charging device.