WO2015155811A1

WO2015155811A1 - Power supply device and method for feeding power to electronic equipment connected to said power supply device

Info

Publication number: WO2015155811A1
Application number: PCT/JP2014/004641
Authority: WO
Inventors: 良和板倉
Original assignee: 三洋電機株式会社
Priority date: 2014-04-10
Filing date: 2014-09-10
Publication date: 2015-10-15
Also published as: JP6189417B2; JPWO2015155811A1

Abstract

　This power supply device is provided with: an AC circuit part (1) having an AC power supply (10) as the input source, and outputting prescribed DC power; a secondary cell (2) charged by the power outputted by the AC circuit part (1); an output connector (3) for connecting electronic equipment (30) to be supplied with power; and a power feed controller (4) which has the output of the AC circuit part (1) as the power supply, for controlling the charging and discharging of the secondary cell (2), and for outputting the output of the AC circuit part (1) or the secondary cell (2) to the output connector (3) and supplying power to the electronic equipment (30) connected to the output connector (3). In a first connection state in which the AC power supply (10) is connected to the AC circuit part (1) and the electronic equipment (30) is connected to the output connector (3), the power feed controller (4) uses the output of the AC circuit part (1) to feed power to the electronic equipment (30) in a preferential manner with respect to charging of the secondary cell (2), and initiates charging of the secondary cell (2) upon detecting that the power feed to the electronic equipment (30) has fallen to or below a threshold value.

Description

Power supply device and method for supplying power to electronic equipment connected to the power supply device

The present invention relates to a power supply device that is connected to an electronic device such as a mobile phone or a smartphone and charges a built-in battery built in the electronic device, and in particular, an AC power supply is connected in a state where the built-in battery of the electronic device is discharged. In addition, the present invention relates to a power supply device that charges a built-in battery of the electronic device and a secondary battery built in the power supply device when the electronic device is connected, and a power supply method to the electronic device connected to the power supply device.

With the widespread use of portable electronic devices such as mobile phones, smartphones, portable music players, portable game machines, and tablet (slate) type PCs, charging internal batteries built into these electronic devices on the go Booster-type power supplies are being developed and provided. Such a power supply device has a built-in secondary battery, receives power from the outside, charges the built-in secondary battery, discharges the charged secondary battery, and is externally connected. Charge the built-in battery of the electronic device. This power supply device can be conveniently used by charging the built-in battery of the electronic device when the built-in battery of the electronic device runs out while on the go. However, this type of power supply device can only be used after charging the built-in secondary battery. For this reason, it is necessary to charge the secondary battery before use or after discharging, and such charging takes time.

On the other hand, electronic devices that are to be charged (for example, electronic devices such as mobile phones and smartphones) want to be used quickly as users. However, even if an electronic device is connected to a power supply device in which the built-in secondary battery is in an uncharged state, it is necessary to charge the secondary battery first, and then charge the electronic device to be charged. There was a problem of becoming longer. Moreover, since the secondary battery once charged is discharged and the built-in battery of the electronic device is charged, there is a problem in that the number of charge / discharge cycles of the secondary battery is increased and the battery life is shortened.

Therefore, a power supply device has been developed in which an externally connected electronic device is charged first and charging of the built-in secondary battery is started after this charging is completed (see, for example, Patent Document 1). However, in this case, since it is necessary to charge the secondary battery of the power supply device after the charging of the electronic device is completed, there is a problem that it takes time until the power supply device can be used.

Utility Model Registration No. 3178882

The present invention has been made to solve such conventional problems. A main object of the present invention is to provide a power supply device that can preferentially charge an externally connected electronic device while shortening the charging time of a built-in secondary battery, and an electronic device connected to the power supply device. It is in providing the electric power feeding method.

In order to achieve the above object, the power supply apparatus of the present invention connects the electronic device 30 to be supplied with power and supplies power to the electronic device 30. The power supply apparatus 100 includes an AC power supply 10 as an input source, an AC circuit unit 1 that outputs predetermined DC power, a secondary battery 2 that is charged with power output from the AC circuit unit 1, and an electronic device to be fed The output connector 3 for connecting 30 and the charging / discharging of the secondary battery 2 are controlled, and the output of the AC circuit unit 1 or the secondary battery 2 is output to the output connector 3 and connected to the output connector 3. And a power supply control unit 4 that supplies power to the electronic device 30. In the first connection state in which the AC power source 10 is connected to the AC circuit unit 1 and the electronic device 30 is connected to the output connector 3, the power supply control unit 4 charges the output of the secondary battery 2 with the output from the AC circuit unit 1. The power supply to the electronic device 30 is prioritized over, and the charging of the secondary battery 2 is started by detecting that the power supply to the electronic device 30 has dropped below a threshold value.

In the power supply device of the present invention, the power supply control unit 4 further charges the secondary battery 2 using the output of the AC circuit unit 1 as a power source, and outputs the secondary battery 2 to a predetermined direct current. The control circuit 7 includes a DC / DC conversion circuit 6 that converts the electric power into power and outputs the power to the output connector 3, the charge control circuit 5, and a control circuit 7 that controls the operating state of the DC / DC conversion circuit 6. However, charging / discharging of the secondary battery 2 can be controlled by controlling the charging control circuit 5 and the DC / DC conversion circuit 6.

With the above configuration, while the secondary battery is stably charged with the power output from the AC circuit unit, the output of the secondary battery is converted into a predetermined DC power by the DC / DC conversion circuit and stabilized to the output connector 3. Can be supplied.

In the power supply device of the present invention, the power supply control unit 4 further includes a current detection circuit 8 that detects a current value supplied to the electronic device 30, and the current detection circuit 8 detects in the first connection state. When the current value to be reduced falls below a predetermined threshold value, the control circuit 7 can control the charging control circuit 5 to start charging the secondary battery 2.

With the above configuration, the current detection circuit detects a decrease in the current value supplied to the electronic device and starts charging the secondary battery, so it can easily and accurately detect the decrease in the power supply to the electronic device, The battery can be charged quickly.

In the power supply device of the present invention, the threshold value of the current value for starting charging of the secondary battery 2 can be set to 20% to 60% of the maximum output current value of the AC circuit unit 1.

With the above configuration, charging of the secondary battery is started in a state where the current value supplied to the electronic device is reduced to 20% to 60% of the maximum output current value of the AC circuit unit, so the maximum output current of the AC circuit unit The secondary battery can be charged efficiently with a charging current value of 80% to 40% of the value.

In the power supply device of the present invention, the power supply control unit 4 further outputs the output side of the AC circuit unit 1 via the through line 9 that bypasses the charge control circuit 5 and the DC / DC conversion circuit 6. It can be connected to the connector 3.

With the above configuration, when an AC power supply is connected, power can be supplied directly from the AC circuit unit to the output connector via the through line without going through the charge control circuit and the DC / DC conversion circuit. Therefore, efficient power supply without loss can be achieved.

The power supply device of the present invention further includes a circuit switch 13 in the through line 9, and the control circuit 7 controls the circuit switch 13 to control power supply from the AC circuit unit 1 to the electronic device 30. can do.

With the above configuration, a safe and stable power supply can be realized by controlling the power supply through the through line from the AC circuit unit to the output connector.

In the power supply device of the present invention, the control circuit 7 further includes an abnormality detection circuit 14, and when the abnormality detection circuit 14 detects an abnormality, the control circuit 7 cuts off the circuit switch 13 and the AC circuit unit. The power supply from 1 to the electronic device 30 can be stopped.

With the above configuration, safe and stable power supply can be realized by controlling power supply through the through line from the AC circuit unit to the output connector in the event of an abnormality.

The power supply apparatus according to the present invention further includes a device detection circuit 12 that detects that the electronic device 30 is connected to the output connector 3, and the power supply control unit 4 includes the AC circuit from the first connection state. When the AC power supply 10 is connected to the unit 1 and the electronic device 30 is not connected to the output connector 3, the device detection circuit 12 no longer receives an electrical signal from the output connector 3. Thus, the control circuit 7 can charge the secondary battery 2 with the charge control circuit 5 in an operating state.

With the above configuration, when the electronic device is disconnected from the output connector in a state where the output of the AC circuit unit is output to the output connector and power is supplied to the electronic device in the first connection state, the output from the AC circuit unit is automatically performed. Therefore, the charging time of the secondary battery can be shortened by switching to the charging of the secondary battery.

The power supply apparatus according to the present invention further includes an AC input detection circuit 11 for detecting that the AC power supply 10 is connected to the AC circuit unit 1, wherein the power supply control unit 4 includes the AC connection detection circuit 11 from the first connection state. When the AC power supply 10 is not connected to the AC circuit unit 1 and the electronic device 30 is connected to the output connector 3, the AC input detection circuit 11 is connected to the AC circuit unit 1 in an AC state. When it is detected that power is not input, the control circuit 7 can output the DC / DC conversion circuit 6 from the secondary battery 2 to the output connector 3 in an operating state.

With the above configuration, even when the AC power supply is disconnected from the AC circuit unit in the state of outputting the output of the AC circuit unit to the output connector and supplying power to the electronic device in the first connection state, the secondary battery automatically It is possible to continue the power supply to the electronic equipment by switching to the discharge.

In the power supply device of the present invention, when the power supply control unit 4 further detects that the power supply to the electronic device 30 has decreased to 0 A, the charging current of the secondary battery 2 is converted to the maximum output current value of the AC circuit unit 1. The following predetermined current value can be raised.

With the above configuration, after the charging of the built-in battery 33 of the electronic device 30 is completed, the charging current to the secondary battery can be increased to the maximum output current value of the AC circuit unit, thereby shortening the charging time of the secondary battery. it can.

In the power supply device of the present invention, the maximum output current value of the AC circuit unit 1 is made larger than the current that supplies power to the electronic device 30, and the secondary battery 2 is precharged during power supply to the electronic device 30. Can do.

With the above configuration, since the secondary battery can be precharged during constant current charging of the electronic device, the charging capacity of the secondary battery can be increased while maintaining the same charging time.

In the power supply device of the present invention, the AC circuit unit 1 further includes an output voltage correction circuit 16 that corrects an output voltage, and the output voltage correction circuit 16 detects a voltage on the input side of the output connector 3. The output voltage of the AC circuit unit 1 can be corrected.

With the above configuration, even when a high output current is applied to the output connector, the output voltage of the output connector can be adjusted, and the accuracy of the output voltage in accordance with the standard can be secured.

The power supply device of the present invention further includes a main body case 20 containing the AC circuit unit 1, the secondary battery 2, and the power supply control unit 4, and the main body case 20 converts the AC circuit unit 1 into an AC power source 10. A foldable power plug 22 for connection can be provided.

With the above configuration, the wiring between the AC circuit unit and the power feeding control unit can be simplified by incorporating the AC circuit unit in the main body case. Further, by incorporating the AC circuit portion in the main body case, an AC adapter made of a separate member from the power supply main body is not required, and only the main body case can be carried and used conveniently. Further, even when a high output current is output from the AC circuit unit, it is possible to stably supply power without causing a voltage drop due to the line resistance of the output cable as in the case of using the AC adapter. In addition, by arranging the power plug so as to be foldable with respect to the main body case, the power plug can be stored compactly in the main body case and conveniently carried when the power plug is not used.

In the power supply device of the present invention, the output connector 3 can be a USB connector.

The method for supplying power to an electronic device connected to the power supply apparatus of the present invention includes an AC power supply 10 as an input source, an AC circuit unit 1 that outputs predetermined DC power, and charging with the power output from the AC circuit unit 1 The secondary battery 2 to be connected, the output connector 3 for connecting the power supply target electronic device 30, and the output of the AC circuit unit 1 as a power source to control charging / discharging of the secondary battery 2 and the AC An electronic device to be supplied with power to a power supply device including a power supply control unit 4 that outputs the output of the circuit unit 1 or the secondary battery 2 to the output connector 3 and supplies power to the electronic device 30 connected to the output connector 3 30 is a method of supplying power to the electronic device 30 in the first connection state in which the AC power source 10 is connected to the AC circuit unit 1 and the electronic device 30 is connected to the output connector 3. For electronic device 30 A step of starting the feeding Te, when it is detected that the power supply to the electronic device 30 falls below the threshold value, is characterized by comprising the step of initiating the charging of the secondary battery 2.

According to the power supply device of the present invention and the method for supplying power to the electronic device connected to the power supply device, the AC power source is connected to the AC circuit unit, and the electronic device is connected to the output connector first. By charging the battery, the built-in battery of the electronic device can be preferentially charged and the electronic device can be used immediately. However, by starting the charging of the secondary battery, it is possible to start charging the secondary battery without waiting for the completion of power supply to the electronic device, and as a result, the charging of the secondary battery can be terminated early. Therefore, the time required for charging the power supply device can be ideally shortened.

In addition, since the power supply to the electronic device is prioritized over the charging of the secondary battery built in the power supply device, it is not necessary to charge / discharge the secondary battery of the power supply device every time power is supplied to the electronic device. The number of charge / discharge cycles can be reduced, the secondary battery can be prevented from deteriorating and the battery life can be extended.

It is a block diagram of the power supply device which concerns on one embodiment of this invention. 1 is a perspective view of a power supply device according to an embodiment of the present invention. It is a perspective view which shows the use condition of the power supply device of FIG. It is a perspective view which shows the use condition of the power supply device of FIG. It is a block diagram which shows the state which electrically feeds an electronic device in the 1st connection state of the power supply device shown in FIG. It is a block diagram which shows the state which charges a secondary battery in the 1st connection state of the power supply device shown in FIG. It is a figure which shows the voltage and electric current characteristic of the state which the power supply device shown in FIG. 1 charges an electronic device and a secondary battery in a 1st connection state. It is a block diagram which shows the state which discharges from a secondary battery and supplies electric power to an electronic device in the 3rd connection state of the power supply device shown in FIG. It is a block diagram which shows the state which charges a secondary battery in the 2nd connection state of the power supply device shown in FIG. It is a block diagram of the power supply device which concerns on other embodiment of this invention. It is a block diagram of the power supply device which concerns on other embodiment of this invention. It is a figure which shows the voltage and electric current characteristic of the other state in which the power supply device shown in FIG. 1 charges an electronic device and a secondary battery in a 1st connection state. It is a figure which shows the voltage and electric current characteristic of the other state in which the power supply device shown in FIG. 1 charges an electronic device and a secondary battery in a 1st connection state.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.

1 to 4 show a power supply device 100 according to an embodiment of the present invention. The power supply device 100 shown in these drawings is connected to an electronic device 30 to be supplied with power and supplies power to the electronic device 30. Here, as the electronic device 30 connected to the power supply device 100, a built-in rechargeable battery 33 such as a mobile phone, a smart phone, a portable music player, a portable game machine, a digital camera, a tablet (slate) type PC or the like is incorporated. Electronic equipment can be used. Alternatively, the electronic device 30 can be a battery pack. These electronic devices 30 are connected to the power supply device 100 via a connection cable 31 as shown in FIG. 3 or connected to the power supply device via a connection terminal provided on the electronic device 30 (not shown). Connected.

A power supply device 100 shown in FIGS. 1 to 4 includes an AC circuit unit 1 that outputs predetermined DC power using an AC power source 10 as an input source, and a secondary battery 2 that is charged with power output from the AC circuit unit 1. The output connector 3 for connecting the electronic device 30 to be fed and the output of the AC circuit unit 1 are used as a power source to control charging / discharging of the secondary battery 2, and the AC circuit unit 1 or the secondary battery 2 A power supply control unit 4 that outputs an output to the output connector 3 and supplies power to the electronic device 30 connected to the output connector 3 is provided. Furthermore, the power supply device 100 shown in FIGS. 2 to 4 includes a main body case 20 in which the AC circuit unit 1, the secondary battery 2, and the power supply control unit 4 are built. The main body case 20 is formed in a hollow box shape with an insulating material such as plastic, and accommodates the secondary battery 2 therein and electronic components (not shown) constituting the AC circuit unit 1 and the power supply control unit 4. ) Is stored.

(AC circuit unit 1)
As shown in FIG. 1, the AC circuit unit 1 is connected to an AC power supply 10, converts input AC power into predetermined DC power, and outputs it. In the power supply apparatus 100 of FIG. 1, since the AC power supply 10 is a commercial power supply, the AC circuit unit 1 is a circuit that converts AC 100V, which is a commercial power supply, into a DC voltage. The power supply device 100 of FIGS. 2 to 4 includes a power plug 22 connected to the AC circuit unit 1, and the power plug 22 is inserted into a commercial power outlet 35 to be supplied with AC power.

(Secondary battery 2)
The secondary battery 2 is a secondary battery that is charged with DC power output from the AC circuit unit 1 and is a lithium ion secondary battery. However, the power supply apparatus 100 of the present invention does not specify the secondary battery 2 as a lithium ion secondary battery. As the secondary battery 2, all other rechargeable batteries such as a nickel metal hydride battery and a nickel cadmium battery can be used. The power supply apparatus 100 shown in FIGS. 2 to 4 stores one cylindrical battery as the secondary battery 2 in the main body case 20. However, the power supply apparatus 100 can include a plurality of secondary batteries, and can include a battery having a shape other than the cylindrical battery.

(Output connector 3)
As shown in FIG. 3, the output connector 3 is connected to an electronic device 30 to be fed. As the output connector 3, various types of standardized or standardized connectors can be used. As such a connector, a connector to which a USB terminal A type or B type is connected can be used. The output connector 3 shown in the figure is a USB connector 3A into which an A type USB terminal 32 can be inserted. However, the output connector may be a USB connector into which a B type USB terminal can be inserted. The power supply apparatus 100 shown in FIGS. 2 to 4 includes a USB connector 3A as the output connector 3 at substantially the center of the end face wall 21 of the main body case 20. Although not shown, the output connector 3 is fixed to a circuit board accommodated in the main body case 20 and disposed at a fixed position of the main body case 20. The main body case 20 shown in FIGS. 2 to 4 is positioned inside the connector window opened in the end face wall 21 and fixes the output connector 3.

(Power supply control unit 4)
The power feeding control unit 4 is connected to the output side of the AC circuit unit 1 and controls charging / discharging of the secondary battery 2 and outputs the output of the AC circuit unit 1 or the secondary battery 2 to the output connector 3. , DC power is supplied to the electronic device 30 connected to the output connector 3. 1 includes a charging control circuit 5 that charges the secondary battery 2 using the output of the AC circuit unit 1 as a power source, and an output connector 3 that converts the output of the secondary battery 2 into predetermined DC power. A DC / DC conversion circuit 6 for outputting to the power supply, a charge control circuit 5 and a control circuit 7 for controlling the operating state of the DC / DC conversion circuit 6.

(Charge control circuit 5)
The charge control circuit 5 charges the secondary battery 2 with the operation state controlled by the control circuit 7. The secondary battery 2 charged with the output power of the AC circuit unit 1 is fully charged by the charge control circuit 5. The secondary battery 2, which is a lithium ion secondary battery, is charged with a constant current until a predetermined voltage is reached, and then charged with a constant voltage to be fully charged.

(DC / DC conversion circuit 6)
The DC / DC conversion circuit 6 converts the voltage of the charged secondary battery 2 into a constant voltage and outputs it. The DC / DC conversion circuit 6 is controlled in its operation state by the control circuit 7, converts the output of the secondary battery 2 into a predetermined DC voltage, and outputs it to the output connector 3. The DC / DC conversion circuit 6 is controlled to be in an operating state at a timing when the secondary battery 2 is discharged and the electronic device 30 is supplied with electric power output from the secondary battery 2.

In the first connection state in which the AC power supply 10 is connected to the AC circuit unit 1 and the electronic device 30 is connected to the output connector 3, the power supply control unit 4 described above outputs the output from the AC circuit unit 1 to the secondary battery 2. Power is supplied to the electronic device 30 with priority over the charging. In order to realize this, the power supply control unit 4 shown in FIG. 1 includes a through line 9 that bypasses the charging control circuit 5 and the DC / DC conversion circuit 6, and the AC line is connected to the AC line through the through line 9. The output side of the circuit unit 1 is connected to the output connector 3. As shown in FIG. 5, in the first connection state in which the AC power supply 10 is connected to the AC circuit unit 1 and the electronic device 30 is connected to the output connector 3, the power supply control unit 4 includes the charge control circuit. 5 is set to a non-operating state, and the output from the AC circuit unit 1 is preferentially supplied to the electronic device 30 via the through line 9 without charging the secondary battery 2. For this reason, the built-in battery 33 of the electronic device 30 can be charged before the secondary battery 2 is charged, and the electronic device 30 can be used immediately.

Furthermore, when the power supply control unit 4 detects that the power supply to the electronic device 30 has decreased below the threshold value in a state where the AC circuit unit 1 is energized to the output connector 3 through the through line 9, as shown in FIG. Then, charging of the secondary battery 2 is started with the charging control circuit 5 in the operating state. The power supply apparatus 100 shown in FIG. 1 includes a current detection circuit 8 that detects a current value supplied to the electronic device 30. In the first connection state, the current value detected by the current detection circuit 8 is a predetermined threshold value. When the following occurs, the control circuit 7 controls the charging control circuit 5 to the operating state and starts charging the secondary battery 2. As described above, the structure in which the current detection circuit 8 detects a decrease in the value of the current supplied to the electronic device 30 and starts charging the secondary battery 2 can easily and accurately detect the decrease in the power supply to the electronic device 30. Thus, charging of the secondary battery 2 can be started quickly.

The threshold value of the current value at which charging of the secondary battery 2 is started can be, for example, 20% to 60%, preferably 25 to 50% of the maximum output current value of the AC circuit unit 1. According to this configuration, the charging of the secondary battery 2 is started in a state in which the current value supplied to the electronic device 30 is reduced to a predetermined ratio with respect to the maximum output current value of the AC circuit unit 1. 80% to 40%, preferably 75 to 50% of the maximum output current value of 1 is defined as the charging current, in other words, the current value corresponding to the difference from the threshold value of the maximum output current value of the AC circuit unit 1 is defined as the charging current. The secondary battery 2 can be charged efficiently.

In FIG. 7, the output of the AC circuit unit 1 having a maximum output current value of 1.5 A is supplied to the electronic device 30, the built-in battery 33 built in the electronic device 30 is charged, and the electronic device 30 is energized. When the current value falls below 0.5 A, which is a threshold value, charging of the secondary battery 2 is started and the secondary battery 2 is fully charged. In FIG. 7, a curve A represents a change in current characteristics supplied from the AC circuit unit 1 to the electronic device 30 through the through line 9, and a curve B represents current characteristics supplied from the AC circuit unit 1 to the charging control circuit 5. Each change is shown. A curve C represents a change in voltage characteristics of the built-in battery 33 of the electronic device 30 charged with power supplied from the power supply device 100, and a curve D represents a voltage characteristic of the secondary battery 2 charged by the charge control circuit 5. Each change is shown.

As shown in FIG. 5 and FIG. 7, the power supply apparatus 100 first starts supplying power only to the electronic device 30 and charges the built-in battery 33 built in the electronic device 30. A curve A and a curve C in FIG. 7 show a state in which the internal battery 33 of the electronic device 30 is charged with a constant current at 1.5 A until a predetermined voltage (4.2 V) is reached, and then charged with a constant voltage. . The built-in battery 33 that is charged at a constant voltage is eventually fully charged as the charging current decreases, as shown by the curve A. However, the power supply device 100 is not fully charged before the built-in battery 33 of the electronic device 30 is fully charged. Then, charging of the secondary battery 2 is started. That is, in the power supply device 100, when the current value detected by the current detection circuit 8 becomes 0.5 A or less which is a threshold value, as shown in FIG. 2 charging starts. At this time, since the value of the current supplied to the electronic device 30 through the through line 9 is 0.5 A or less, the charging control circuit 5 charges the secondary battery 2 with a charging current of 1.0 A. Can do. In this state, as shown by curve B and curve D in FIG. 7, the secondary battery 2 is charged at a constant current of 1.0 A until it reaches a predetermined voltage (4.2 V), and then charged at a constant voltage. Fully charged.

As described above, in the power supply device 100 of the present invention, the charging of the secondary battery 2 is started before the power supply to the electronic device 30 is completed. Therefore, the power output from the AC circuit unit 1 is effectively used. Power feeding to the electronic device 30 and charging of the secondary battery 2 can be performed efficiently. In particular, since charging of the secondary battery 2 is started at a timing when the charging current decreases as the built-in battery 33 of the electronic device 30 approaches full charge, the AC circuit unit does not affect the power supply to the electronic device 30. The secondary battery 2 can be charged without increasing the output of 1. According to this power supply method, as shown in FIG. 7, it is possible to provide a time zone in which power supply to the electronic device 30 and charging of the secondary battery 2 are performed simultaneously. The time required for charging the secondary battery 2 can be shortened.

Here, as shown in FIG. 7, it takes 2 hours to charge the built-in battery 33 of the electronic device 30 to 2500 mAh by constant current-constant voltage charging with a maximum charging current of 1.5 A, and the maximum charging current is Consider a case where it takes 3 hours to charge the secondary battery 2 of the power supply apparatus 100 to 2500 mAh with constant current-constant voltage charging of 1.0 A. In this case, in the conventional power supply apparatus and power supply method, since the charging of the secondary battery of the power supply apparatus is started after the charging of the built-in battery of the electronic device is completed, the total charging time is required for at least 5 hours. On the other hand, in the power supply device and the power supply method of the present invention, as shown in FIG. 7, the charging of the secondary battery 2 is started before the charging of the built-in battery 33 of the electronic device 30 is completed. Since a time zone for simultaneously supplying power to the battery and charging the secondary battery 2 is provided, the total charging time is shortened to 4.5 hours, and the time required to complete the charging of the secondary battery 2 is reduced to about 0. .5 hours can be shortened.

(AC input detection circuit 11)
The power supply control unit 4 illustrated in FIG. 1 includes an AC input detection circuit 11 that detects that an AC power supply 10 is connected to the AC circuit unit 1. The AC input detection circuit 11 detects whether or not the AC power source 10 is connected to the AC circuit unit 1 based on an electrical signal input from the AC circuit unit 1. For example, when a high signal is output from the AC circuit unit 1, the AC input detection circuit 11 determines that the AC power supply 10 is connected to the AC circuit unit 1, and when a low signal is output from the AC circuit unit 1, It can be determined that the AC power supply 10 is not connected to the AC circuit unit 1. When the AC input detection circuit 11 detects that the AC power supply 10 is connected to the AC circuit unit 1, the AC input detection circuit 11 inputs a detection signal to the control circuit 7. The control circuit 7 determines that the AC power supply 10 is connected to the AC circuit unit 1 in a state where a detection signal is input from the AC input detection circuit 11, and in a state where no detection signal is input from the AC input detection circuit 11. It is determined that the AC power supply 10 is not connected to the AC circuit unit 1.

In this specification, the AC power supply 10 connected to the AC circuit unit 1 means a state in which AC power is input to the AC circuit unit 1 from the AC power supply 10 connected to the AC circuit unit 1. And Therefore, the AC input detection circuit 11 detects that AC power is input to the AC circuit unit 1 and that predetermined DC power can be output from the AC circuit unit 1. Here, the AC input detection circuit 11 not only detects whether AC power is input from the AC power supply 10, but also detects whether DC power is output from the AC circuit unit 1. it can. For example, although AC power is input from the AC power supply 10 to the AC circuit unit 1 due to a failure of the AC circuit unit 1 or the like, even in a state where predetermined DC power is not output from the AC circuit unit 1, the AC circuit is substantially reduced. It may be determined that the AC power supply 10 is not connected to the unit 1 and the control circuit 7 may be controlled not to output a detection signal.

As described above, the power supply control unit 4 including the AC input detection circuit 11 is the AC circuit in the first connection state in which the AC power source 10 is connected to the AC circuit unit 1 and the electronic device 30 is connected to the output connector 3. When the AC input detection circuit 11 detects that the AC power supply 10 is disconnected from the power supply device 100 during power feeding from the unit 1 to the electronic device 30, as shown in FIG. 8, the secondary battery 2 to the electronic device 30. The discharge can be started. The control circuit 7 of the power supply control unit 4 is supplying power from the AC circuit unit 1 to the electronic device 30 in a state where the detection signal is input from the AC input detection circuit 11 and the current detection circuit 8 detects the charging current. Is determined. In this state, when the detection signal is not input from the AC input detection circuit 11, the control circuit 7 determines that the input from the AC power supply 10 to the AC circuit unit 1 is cut off, and operates the DC / DC conversion circuit 6. As a state, output from the secondary battery 2 to the output connector 3 is started. For this reason, even when the AC power supply 10 is disconnected from the AC circuit unit 1 in a state where power is supplied to the electronic device 30 by the output of the AC circuit unit 1, the discharge from the secondary battery 2 is automatically switched to the electronic device 30. Power supply can be continued. Thereby, for example, even when the power supply device 100 is disconnected from the AC power supply 10 while the built-in battery 33 of the electronic device 30 is being charged, power is supplied from the built-in secondary battery 2 to the electronic device 30 to Charging of the battery 33 can be continued.

(Device detection circuit 12)
Furthermore, the power supply control unit 4 illustrated in FIG. 1 also includes a device detection circuit 12 that detects that the electronic device 30 is connected to the output connector 3. The device detection circuit 12 can detect whether or not the electronic device 30 is connected to the output connector 3 with an electrical signal input from the output connector 3. When detecting that the electronic device 30 is connected to the output connector 3, the device detection circuit 12 inputs a detection signal to the control circuit 7. The control circuit 7 determines that the electronic device 30 is connected to the output connector 3 when the detection signal is input from the device detection circuit 12, and outputs the output connector when the detection signal is not input from the device detection circuit 12. 3 determines that the electronic device 30 is not connected.

Since the above power supply control unit 4 includes the device detection circuit 12, the connection state of the electronic device 30 can be reliably detected based on the presence or absence of a detection signal output from the device detection circuit 12. However, the power supply control unit 4 is not necessarily provided with a device detection circuit. This is because whether or not the electronic device 30 is connected can be detected by detecting the current value supplied to the electronic device with the current detection circuit. For example, when the electronic device 30 connected to the output connector 3 is disconnected, the control circuit 7 can detect from the output current that the electronic device 30 has been disconnected from the output connector 3. This is because the output current becomes 0 A when the electronic device 30 is removed.

Furthermore, the power supply device 100 is supplied from the AC circuit unit 1 as shown in FIG. 9 in the second connection state in which the AC power source 10 is connected to the AC circuit unit 1 and the electronic device 30 is not connected to the output connector 3. The secondary battery 2 is charged with electric power. When the control circuit 7 detects that the AC power supply 10 is connected to the AC circuit unit 1 and the electronic device 30 is not connected to the output connector 3, the power supply control unit 4 sets the charging control circuit 5 to the operating state. The secondary battery 2 is charged. In this state, the secondary battery 2 is fully charged by the charge control circuit 5.

Further, the power supply apparatus 100 is in a state in which the AC power supply 10 is not connected to the AC circuit unit 1 and the second connection state in which the electronic device 30 is connected to the output connector 3, as shown in FIG. The electric power discharged from the battery 2 is converted into a predetermined DC voltage by the DC / DC conversion circuit 6 and output to the output connector 3. The DC / DC conversion circuit 6 is switched to the operation state by the control circuit 7, converts the output of the secondary battery 2 into a predetermined voltage, and supplies the stabilized power to the output connector 3 connected to the output side. Output. In this state, predetermined DC power is supplied to the electronic device 30 connected to the output connector 3.

At this time, as described above, when the AC power supply 10 is disconnected from the power supply device 100 during the power supply from the AC circuit unit 1 to the electronic device 30 in the first connection state, the control circuit 7 Can be detected by the AC input detection circuit 11, and the discharge from the secondary battery 2 to the electronic device 30 can be automatically started with the DC / DC conversion circuit 6 in the operating state. The control circuit 7 also detects this even when the electronic device 30 is connected to the output connector 3 in a state where the AC power supply 10 is not connected to the AC circuit unit 1, and detects the fact from the secondary battery 2 to the electronic device 30. Can begin to discharge. For example, the control circuit 7 detects that the AC power supply 10 is not connected to the AC circuit unit 1 with the AC input detection circuit 11, and detects with the device detection circuit 12 that the electronic device 30 is connected to the output connector 3. Thus, the DC / DC conversion circuit 6 can be automatically switched to the operating state, and discharge from the secondary battery 2 to the electronic device 30 can be started.

However, the power supply apparatus 100 is not necessarily configured to automatically switch the DC / DC conversion circuit 6 to the operating state in the third connection state. The power supply device 100 shown in FIGS. 1 and 4 includes a push button switch 25 that is operated via an operation unit 24 provided in the main body case 20. In the power supply device 100, the control circuit 7 can switch the DC / DC conversion circuit 6 to an operating state by a signal input from the push button switch 25. For example, when an ON signal is input from the push button switch 25 for a certain time, the control circuit 7 switches the DC / DC conversion circuit 6 to an operating state and starts discharging from the secondary battery 2. In this structure, the discharge of the secondary battery 2 can be started by operating the push button switch 25 without providing the AC input detection circuit 11 or the device detection circuit 12. In the power supply device 100, when the AC power supply 10 is disconnected and the third connection state is shifted during power feeding to the electronic device 30 in the first connection state, the control circuit 7 automatically turns on the secondary battery. In the third connection state in which the electronic device 30 is connected to the output connector 3 while the AC power supply 10 is not connected to the AC circuit unit 1, the push button switch 25 is operated. Thus, the discharge from the secondary battery 2 can be switched.

As described above, the power supply control unit 4 detects the first connection state, the second connection state, and the third connection state by the control circuit 7 and supplies the electronic device 30 connected to the output connector 3 to the electronic device 30. The power feeding and charging of the secondary battery 2 are controlled.

(Power plug 22)
Further, the power supply apparatus 100 shown in FIGS. 2 to 4 includes a power plug 22 connected to a commercial power outlet 35 in order to connect the AC power supply 10 to the AC circuit unit 1. The power supply apparatus 100 shown in FIGS. 2 to 4 has the AC circuit unit 1 built in the main body case 20 and can be connected to the AC power supply 10 via the power plug 22 arranged in the main body case 20. The power plug 22 shown in FIGS. 2 to 4 is connected to the main body case 20 so as to be foldable. When the power supply device 100 is connected to the AC power source 10, the plug blade 22A of the power plug 22 is removed from the main body case 20. It can be pulled out and inserted into a commercial power outlet 35. Further, the power plug 22 can be stored compactly by folding the plug blade 22A when not connected to the AC power source 10. The main body case 20 shown in FIGS. 2 to 4 is provided with a housing recess 23 in the bottom surface for housing the plug blade 22A of the power plug 22. With the above structure, the power plug 22 is rotated to project the plug blade 22A only when connecting to the AC power source 10 such as a commercial power source, and when not connected to the AC power source 10, the power plug 22 is inserted into the housing recess 23. It has the feature that it can be stored and carried compactly.

The power supply apparatus 100 described above has the AC circuit unit 1 built in the main body case 20, and the main body case 20 is provided with a power plug 22 connected to the AC circuit unit 1. However, although the power supply device is not shown, it is not always necessary to provide the power supply plug connected to the AC circuit unit in the main body case, and an extension cord having a power plug at the tip is connected to the main body case to power the AC circuit unit. It can also be connected to a plug.

10 and 11 show power supply apparatuses 200 and 300 according to other embodiments of the present invention, respectively. In these drawings, the same components as those of the power supply apparatus 100 according to the embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

(Circuit switch 13)
A power supply device 200 shown in FIG. 10 includes a circuit switch 13 in the through line 9 that connects the AC circuit unit 1 and the output connector 3. In the power supply control unit 4, the control circuit 7 controls the circuit switch 13 to be turned on and off, thereby controlling power supply from the AC circuit unit 1 to the electronic device 30.

(Abnormality detection circuit 14)
Further, in the power supply apparatus 200 shown in FIG. 10, the control circuit 7 includes the abnormality detection circuit 14. When the abnormality detection circuit 14 detects an abnormality, the power supply control unit 4 can stop the power supply from the AC circuit unit 1 to the electronic device 30 by the control circuit 7 blocking the circuit switch 13. For this reason, at the time of abnormality, the power supply by the through line 9 from the AC circuit unit 1 to the output connector 3 can be cut off to improve safety.

The abnormality detection circuit 14 detects an abnormality that occurs during power supply to the electronic device 30. For example, the abnormality detection circuit 14 detects the temperature of the output connector 3 and its surroundings with the temperature sensor 15, and determines that the detected temperature is equal to or higher than a predetermined value and determines that the abnormal state is present, and supplies power to the electronic device 30. Stop. Alternatively, the abnormality detection circuit 14 determines that the state is abnormal when the current value detected by the current detection circuit 8 is greater than a predetermined value, and stops power supply to the electronic device 30.

(Output voltage correction circuit)
Furthermore, in the power supply apparatus 300 shown in FIG. 11, the AC circuit unit 1 includes an output voltage correction circuit 16 that corrects the output voltage. The output voltage correction circuit 16 detects the voltage on the input side of the output connector 3 and corrects the output voltage of the AC circuit unit 1. As described above, the power supply apparatus 300 that detects the voltage on the output side and corrects the output voltage of the AC circuit unit 1 outputs the output of the output connector 3 even when a high output current is applied to the output connector 3. The voltage can be adjusted, and the accuracy of the output voltage according to the standard can be secured.

In the present embodiment, constant current charging is performed at 1.0 A until the secondary battery 2 reaches a predetermined voltage (4.2 V) as shown in FIG. 7, but the electronic device as shown in FIG. After the charging of the 30 built-in batteries 33 is completed, the charging current to the secondary battery 2 is increased to a predetermined current value greater than 1.0 A and 1.5 A or less of the maximum output current value of the AC circuit unit 1. It may be allowed. For example, when the current value detected by the current detection circuit 8 becomes 0 A, the control circuit 7 controls the charge control circuit 5 so as to supply the maximum output 1.5 A of the AC circuit unit 1 to the secondary battery 2. Thereby, the charge time until the secondary battery 2 becomes a predetermined voltage (4.2V) can be shortened. In other words, the total charging time can be shortened to 4.0 hours, and the time taken to complete the charging of the secondary battery 2 can be further shortened by about 0.5 hours compared to FIG.

In the present embodiment, the maximum output current value of the AC circuit unit 1 is 1.5 A. However, the maximum output current value of the AC circuit unit 1 may be larger than the current 1.5 A supplied to the electronic device. . For example, by setting the maximum output current value of the AC circuit unit 1 to 2.0 A, the AC circuit unit 1 causes the built-in battery 33 of the electronic device 30 to have a charging current of 1.5 A, the secondary battery 2 as shown in FIG. It becomes possible to supply a charging current of 0.5 A for the preliminary charging. Then, when the current value detected by the current detection circuit 8 becomes 0.5 A or less which is a threshold value, the control circuit 7 controls the charge control circuit 5 to change the charging current of the secondary battery 2 as shown in FIG. Increase to 1.5 A and start full charge. Further, after charging of the built-in battery 33 of the electronic device 30 is completed, the secondary battery 2 is charged by increasing the charging current to the secondary battery 2 to 2.0 A, which is the maximum output current value of the AC circuit unit 1. 2 can be charged with more charge capacity. In other words, when the total charging time is the same as 4.5 hours in FIG. 7, it is possible to charge approximately 5000 mAh, which is twice as much, and even if two secondary batteries 2 are used in parallel, they can be fully charged in the same charging time. It becomes possible to do.

The power supply device according to the present invention and the method for supplying power to the electronic device connected to the power supply device preferentially charge the externally connected electronic device while reducing the charging time of the secondary battery built in the power supply device. By doing so, it can be suitably used as a power supply device for charging an electronic device on the go.

DESCRIPTION OF

SYMBOLS

100, 200, 300 ... Power supply device 1 ... AC circuit part 2 ... Secondary battery 3 ... Output connector 3A ... USB connector 4 ... Power feeding control part 5 ... Charge control circuit 6 ... DC / DC conversion circuit 7 ... Control circuit 8 ... Current Detection circuit 9 ... Through line 10 ... AC power supply 11 ... AC input detection circuit 12 ... Device detection circuit 13 ... Circuit switch 14 ... Abnormality detection circuit 15 ... Temperature sensor 16 ... Output voltage correction circuit 20 ... Body case 21 ... End face wall 22 ... Power plug 22A ... Plug blade 23 ... Storage recess 24 ... Operation unit 25 ... Push button switch 30 ... Electronic device 31 ... Connection cable 32 ... USB terminal 33 ... Built-in battery 35 ... Outlet

Claims

A power supply device for connecting a power supply target electronic device and supplying power to the electronic device,
An AC circuit unit that outputs predetermined DC power using an AC power source as an input source;
A secondary battery charged with electric power output from the AC circuit unit;
An output connector for connecting a power supply target electronic device;
A power supply control unit that controls charging and discharging of the secondary battery, outputs the output of the AC circuit unit or the secondary battery to the output connector, and supplies power to an electronic device connected to the output connector;
With
In a first connection state in which an AC power source is connected to the AC circuit unit and an electronic device is connected to the output connector,
The power supply control unit detects that the output from the AC circuit unit is supplied to the electronic device in preference to the charging of the secondary battery, and detects that the power supply to the electronic device has dropped below a threshold value, A power supply device configured to start charging a secondary battery.
The power supply device according to claim 1, further comprising:
The power supply control unit
A charge control circuit that charges the secondary battery using the output of the AC circuit unit as a power source;
A DC / DC conversion circuit for converting the output of the secondary battery into a predetermined DC power and outputting it to the output connector;
A control circuit for controlling operating states of the charge control circuit and the DC / DC conversion circuit;
With
A power supply apparatus in which the control circuit controls the charge control circuit and the DC / DC conversion circuit to control charging and discharging of the secondary battery.
The power supply device according to claim 2, further comprising:
The power supply control unit includes a current detection circuit that detects a current value supplied to the electronic device,
In the first connection state, when the current value detected by the current detection circuit falls below a predetermined threshold, the control circuit controls the charge control circuit to start charging the secondary battery. Power supply.
The power supply device according to claim 3,
A power supply apparatus, wherein a threshold value of a current value at which charging of the secondary battery is started is 20% to 60% of a maximum output current value of the AC circuit unit.
The power supply device according to any one of claims 2 to 4, further comprising:
The power supply device, wherein the power supply control unit connects an output side of the AC circuit unit to the output connector via a through line that bypasses the charge control circuit and the DC / DC conversion circuit. .
The power supply device according to claim 5, further comprising:
A power supply apparatus comprising a circuit switch in the through line, wherein the control circuit controls the circuit switch to control power supply from the AC circuit unit to the electronic device.
The power supply device according to claim 6, further comprising:
The control circuit includes an abnormality detection circuit, and when the abnormality detection circuit detects an abnormality, the control circuit shuts off the circuit switch and stops power supply from the AC circuit unit to the electronic device. A power supply characterized by.
The power supply device according to any one of claims 2 to 7, further comprising:
The power supply control unit includes a device detection circuit for detecting that an electronic device is connected to the output connector;
From the first connection state, when the AC power source is connected to the AC circuit unit and the electronic device is not connected to the output connector, the device detection circuit has detected an electrical signal from the output connector. The power supply device is characterized in that when the battery is detected not to be input, the control circuit charges the secondary battery with the charge control circuit operating.
The power supply device according to any one of claims 2 to 8, further comprising:
The power supply control unit includes an AC input detection circuit for detecting that an AC power source is connected to the AC circuit unit;
When the AC input detection circuit shifts from the first connection state to a third connection state in which an AC power source is not connected to the AC circuit unit and an electronic device is connected to the output connector, the AC input detection circuit detects the AC circuit. When the control circuit detects that the AC power is not input to the unit, the control circuit outputs the DC / DC conversion circuit to the output connector from the secondary battery as an operating state.
The power supply device according to any one of claims 1 to 9, further comprising:
When the power supply control unit detects that the power supply to the electronic device has decreased to 0 A, the charging current of the secondary battery is increased to a predetermined current value that is less than or equal to the maximum output current value of the AC circuit unit. Power supply.
The power supply device according to any one of claims 1 to 10, further comprising:
A power supply apparatus characterized in that a maximum output current value of the AC circuit unit is made larger than a current to be fed to an electronic device, and the secondary battery is precharged during feeding to the electronic device.
The power supply device according to any one of claims 1 to 11, further comprising:
The AC circuit unit includes an output voltage correction circuit that corrects an output voltage,
The power supply apparatus, wherein the output voltage correction circuit detects the voltage on the input side of the output connector and corrects the output voltage of the AC circuit unit.
The power supply device according to any one of claims 1 to 12, further comprising:
A main body case containing the AC circuit unit, the secondary battery, and the power supply control unit;
The main body case includes a foldable power plug for connecting the AC circuit unit to an AC power source.
The power supply device according to any one of claims 1 to 13,
The power supply apparatus, wherein the output connector is a USB connector.
An AC circuit unit that outputs predetermined DC power using an AC power source as an input source;
A secondary battery charged with electric power output from the AC circuit unit;
An output connector for connecting a power supply target electronic device;
The output of the AC circuit unit is used as a power source, and charging / discharging of the secondary battery is controlled, and the output of the AC circuit unit or the secondary battery is output to the output connector to be connected to the output connector. A power supply control unit for supplying power to the device;
A power supply device connected to a power supply target electronic device and supplying power to the electronic device,
In a first connection state in which an AC power source is connected to the AC circuit unit and an electronic device is connected to the output connector,
Starting power supply to the electronic device;
A method for supplying power to an electronic device connected to a power supply device, comprising: a step of starting charging of the secondary battery when it is detected that power supply to the electronic device has dropped below a threshold value.