JPH11143591A - Power unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power unit capable of efficiently charging a preliminary secondary battery, of allowing a user to prepare the preliminary secondary battery and exchange batteries at appropriate time, and of miniaturizing electric equipment main body with reduced weight with a built-in secondary battery. SOLUTION: An AC/DC conversion circuit 10, a DC output/charge control circuit 12 and a charging circuit 11 are provided inside an AC adapter 1 connected to an electric equipment main body 2 with a built-in secondary battery 21. The AC/DC conversion circuit 10 feeds power to the electric equipment main body 2 and the charging circuit 11, and simultaneously charges the electric equipment main body 2 and the preliminary secondary battery 13 connected to the secondary batter 21 and the charging circuit 11. Thus, this power unit capable of efficiently charging and exchanging the secondary battery and miniaturizing the electric equipment main body with reduced weight is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply circuit including a secondary battery incorporated in an electric device main body, and an AC circuit including a charging circuit.
The present invention relates to a power supply device having an adapter.

[0002]

2. Description of the Related Art In many cases, a power supply circuit of a portable small electric device such as a notebook computer incorporates a secondary battery so that the electric device can be used wirelessly. The secondary battery is provided in a power supply circuit having a charging function inside the electric device, and is charged by an AC power supply by connecting an AC adapter.

FIG. 2 shows a configuration diagram of a conventional power supply device.
In FIG. 2, 31 is an AC adapter, 40 is an AC / DC conversion circuit built in the AC adapter 31, 41 is a plug for connecting an AC power supply and the AC / DC conversion circuit 40, 32 is an electric device main body, and 33 is AC / DC conversion. A DC / DC conversion circuit fed from the circuit 40; 34, a charging circuit for the secondary battery 36; 35, a power control circuit built in the electric device main body 32;
Denotes a secondary battery built in the electric device main body 32.

[0004] The AC / DC conversion circuit 40 receives an AC power supply via a plug 41 as input and outputs DC power. This DC power is converted into a predetermined DC voltage by a DC / DC conversion circuit 33 and supplied to an electric circuit and electric components (not shown) of the electric device main body 32.

The charging circuit 34 includes a DC / DC conversion circuit 33
, And charges the secondary battery 36 under the control of the power supply control circuit 35.

[0006] The power supply control circuit 35 detects a power failure or A
By detecting the state where the C plug 41 is not inserted into the AC power outlet, the power supply to the electric circuit and the electric components of the electric equipment main body 32 is automatically switched from the AC power supply to the secondary battery 36, and the electric equipment main body 32 is turned on. The operation of is continued.

[0007]

However, in the above-described conventional configuration, the use of the main body of the electric equipment requires two
Charging the next battery takes a long time to complete. Therefore, if the user wants to use the electric device in a place where it cannot be connected to the AC power source, the electric device may not operate because the charging of the secondary battery is not completed even if the user tries to switch from the AC adapter to the power supply using the battery. There is. To always prepare a spare battery for this measure, it is necessary to carry a charger for charging the spare battery and a spare secondary battery together with the electric equipment, which is inconvenient in terms of portability. .

In addition, a circuit for a charging function and a storage capacity for the circuit are required in the electric device main body, and a heavy load is imposed for reducing the size and weight of the electric device main body.

An object of the present invention is to solve the above-mentioned problems and to provide a power supply device capable of rapidly and efficiently charging a built-in and a spare secondary battery and reducing the size of an electric device body. Aim.

[0010]

In order to achieve the above object, a power supply device according to the present invention includes a power supply circuit which includes a secondary battery inside an electric device main body and does not include a charging circuit for the secondary battery, An AC / DC conversion circuit and an AC adapter having a built-in charging circuit;
The DC conversion circuit is configured to simultaneously supply power to the electric device main body and charge a spare secondary battery outside the electric device main body connected to the charging circuit.

The charging circuit in the AC adapter is A
A spare secondary battery outside the electric device main body directly connected to the C adapter and a secondary battery inside the electric device main body are simultaneously charged.

According to the present invention, two secondary batteries connected to the inside and outside of the electric equipment main body can be charged quickly and efficiently, and furthermore, the size of the electric equipment main body can be reduced. A power supply is obtained.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a power supply circuit in a main body of an electric equipment and including a secondary battery, and an AC / DC conversion circuit outside the main body of the electric equipment. An AC adapter having a built-in charging circuit for the secondary battery, wherein the AC / DC conversion circuit is configured to supply power to the power supply circuit; A power supply device configured to charge the next battery at the same time or only to charge the battery. The battery can be quickly charged by directly connecting a spare secondary battery to the battery, so that the spare secondary battery can be efficiently charged. The next battery can be replaced. Since the AC adapter also functions as a charger, there is no need to carry a dedicated charger, which makes it more portable, and the charging circuit can be eliminated from the main body of the electric device, thereby reducing the size and weight of the main body of the electric device. Is obtained.

According to a second aspect of the present invention, there is provided a spare secondary battery connected to a charging circuit built in an AC adapter, and a secondary battery in the electric device main body and connected to the charging circuit. The power supply device according to claim 1, wherein the power supply device is configured to simultaneously charge a spare secondary battery and a secondary battery built in an electric device, in addition to the operation of claim 1 of the present invention, The effect of shortening the charging time and extending the wireless device usage time can be obtained.

Hereinafter, embodiments of the power supply device of the present invention will be described.
This will be described with reference to FIG. (Embodiment 1) FIG. 1 is a configuration diagram showing an embodiment of a power supply device of the present invention.

Reference numeral 1 denotes an AC adapter connected to an AC power supply via an AC plug 3;
It includes a C conversion circuit 10, a charging circuit 11, and a DC output / charge control circuit 12.

Reference numeral 2 denotes an electric equipment main body, which has a built-in power supply circuit including a DC / DC conversion circuit 22, a power supply control circuit 20, and a secondary battery 21. The power supply circuit is composed of an AC adapter 1 and a connecting member. It is connected to a certain connector 14 by a cable 15. Reference numeral 13 denotes a spare secondary battery, which is a charging circuit 11 and a DC output / charging control circuit 12 in the AC adapter 1.
Is connected to a connector 16 as a connecting member by a cable 17.

The AC / DC conversion circuit 10 is a circuit for outputting a DC voltage from an AC power supply. The AC / DC conversion circuit 10 supplies power to the electric device main body 2 via the connector 14 and the cable 15 and also supplies power to the charging circuit 11 at the same time. .

The charging circuit 11 includes a spare secondary battery 13 connected to the connector 16 via the cable 17, and an electric device main body 2 connected to the connector 14 via the cable 15.
The built-in secondary battery 21 is charged by power supply from the AC / DC conversion circuit 10. AC / DC conversion circuit 1
It detects abnormalities in the voltage and current supplied from 0 and adjusts the charging voltage and current for the secondary batteries 13 and 21.

The DC / DC conversion circuit 22 converts a single DC voltage supplied from the AC / DC conversion circuit 10 or from the secondary battery 21 into a stable voltage corresponding to each component or circuit in the electric equipment body 2. This circuit converts the output to a level and detects abnormalities in the input voltage or current, and has the function of adjusting the output.

The power supply control circuit 20 controls the input state of the DC voltage detected by the DC / DC
To control the output power from the DC / DC conversion circuit 22, and to control the DC output in the AC adapter 1 via the connector 16 and the cable 17.
This is a circuit for sending information to the charge control circuit 12.

The DC output / charge control circuit 12 is used for inputting the DC voltage detected by the charging circuit 11, charging status and temperature information from the spare secondary battery 13, The information from the control circuit 20 is fetched and A
This circuit controls the DC output from the C / DC conversion circuit 10 and the charging outputs V31 and V32 from the charging circuit 11.

Next, the operation of the power supply according to the present embodiment will be described. When the user uses the electric equipment main body by connecting the AC adapter 1 to the electric equipment main body 2, ie, A
When the C / DC conversion circuit 10 supplies power to the DC / DC conversion circuit 22, by connecting a spare secondary battery 13 to the connector 16, the charging from the charging circuit 11 to the secondary battery 13 and the electric device body 2 Are performed simultaneously.

Charge output state signal A of spare secondary battery 13
Is detected by the charging circuit 11 and sent to the DC output / charging control circuit 12. If the voltage or current is abnormal, the DC output / charge control circuit 12 controls to stop the DC output V2 of the AC / DC conversion circuit 10 or the charge output V32 from the charging circuit 11.

Further, the DC output / charge control circuit 12 detects the charge status signal B1 from the spare secondary battery 13 and stops the charge output V32 from the charge circuit 11 when the battery is fully charged. The temperature status signal B2 is detected, and if there is an abnormality, control is performed so as to stop the charging output V32 from the charging circuit 11, thereby ensuring safety.

Further, the charging circuit 11 is used to
Power supply control circuit 20 detects the charging status signal C1 from the secondary battery 21 when the secondary battery 21 and the spare secondary battery 13 connected to the AC adapter 1 are simultaneously charged. The signal D1 is sent to the DC output / charge control circuit 12 in the adapter 1 and the charge output V from the charge circuit 11 is output.
31 or the temperature condition signal C2 from the secondary battery 21.
Is detected, and if there is an abnormality, a signal D2 is sent to the DC output / charging control circuit 12 to notify the same, and control is performed so as to stop the charging output V31 from the charging circuit 11, thereby ensuring safety.

In the first embodiment, an example is described in which the spare secondary battery 13 is connected to the AC adapter with the connector 16 on the secondary battery side and the cable 17 on the AC adapter side. The present invention is not limited to the first embodiment because the battery 13 is connected to the AC adapter 1. For example, the same effect can be obtained by connecting a spare secondary battery to a connector provided on the housing of the AC adapter 1.

[0028]

According to the present invention as described above,
Even if the user is using the electric device itself with the built-in secondary battery, or while using the AC adapter connected, a spare secondary battery can be directly connected to the AC adapter to quickly Charging can be performed efficiently, so that the spare secondary battery can be efficiently charged, and the user can prepare the spare battery and replace the battery at the appropriate time. In addition, since the charging circuit can be removed from the main body of the electric device, the size and weight of the main body can be reduced, and since the AC adapter also serves as a charger, there is no need to carry a dedicated charger, which has the effect of being more portable. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing Embodiment 1 of a power supply device of the present invention.

FIG. 2 is a configuration diagram showing a conventional power supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC adapter 2 Electric device main body 3 Plug 10 AC / DC conversion circuit 11 Charging circuit 12 DC output / charge control circuit 13 Secondary battery 20 Power supply control circuit 21 Secondary battery 22 DC / DC conversion circuit

Claims (2)

[Claims] A power supply circuit in a main body of an electric device and including a secondary battery, and an AC / DC power supply outside the main body of the electric device.
An AC adapter having a built-in conversion circuit and a charging circuit for a secondary battery, wherein the AC / DC conversion circuit supplies power to the power supply circuit and is connected to the charging circuit outside the electric device main body. A power supply device configured to charge a spare secondary battery at the same time or only to perform the charging. 2. A secondary battery connected to a charging circuit built in an AC adapter and a secondary battery in the electric device main body and connected to the charging circuit are simultaneously charged. The power supply device according to claim 1.