JPH1146459A - Power supply - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lengthen battery life and reduce time and labor requested for charge and replacement. SOLUTION: The power consumed in an electronic circuit 2 is detected through a consumed power detection circuit 11. If it is estimated that the power consumed in the electronic circuit 2 will exceed the power which can be supplied through a power line 4b, a switching circuit 12 switches power supply to the electronic circuit 2 from that through the power line 4b to that from a battery 13. Thus, if the power consumed in the electronic circuit 2 can be provided through the power line 4b, power is supplied to the electronic circuit 2 only through the power line 4b. Power from the battery 13 is supplied to the electronic circuit 2 only when the power consumed in the electronic circuit 2 exceeds a power which can be supplied through the power line 4b. Therefore, the duration of power supply from the battery 13 to the electronic circuit 2 is reduced, and the power consumed from the battery 13 is accordingly reduced. As a result, the frequency of replacing and charging the battery 13 is reduced, and time and labor required therefor is also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for supplying power to a predetermined circuit through a cable formed of a signal line for transmitting data or signals and a power supply line, and more particularly to an operation of the power supply device. The present invention relates to an improvement of a power supply device that supplies power to a circuit that consumes more power than can be supplied by a power supply line depending on a state.

[0002]

2. Description of the Related Art Conventionally, in an electronic device or the like, for example, as shown in FIG.
By arranging a transmission cable 53 formed of a signal line for supplying data or a control signal to the power supply line and a power supply line for power supply, a power supply provided outside the electronic device 51 is connected to the electronic device 51 via a power supply line. Power supply.

When the power consumption of the electronic circuit 52 is small, it is possible to cover the required power of the electronic circuit 52 by the power that can be supplied through the power supply line.
For example, when the power consumption of the electronic circuit 52 exceeds the power that can be supplied through the power supply line due to a change in the power consumption of the electronic circuit 52 depending on the operation state, as shown in FIG. A power supply circuit 54 dedicated to the electronic circuit 52 and another power supply line 55 for supplying power to the power supply circuit 54 are newly connected to supply power to the electronic circuit 52.

If a new power supply line cannot be provided due to a wiring problem or the like, a battery 56 is built in the electronic device 51 as shown in FIG. Is activated.

[0005]

However, when the battery 56 is provided in the electronic device 51, if the battery 56 is discharged and its voltage drops, it is necessary to perform charging or replacement, which is troublesome. Further, when the battery 56 is discharged when power is required to be supplied from the battery 56, the electronic device 51 becomes inoperable. For example, the battery 56 is replaced or charged periodically. There is a problem that it is necessary to perform a check and it is troublesome.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned conventional unsolved problems. A power source capable of extending a battery replacement or charging cycle and reducing a measure against a voltage drop of the battery is provided. It is intended to provide a device.

[0007]

In order to achieve the above object, a power supply according to claim 1 of the present invention has a possibility of consuming power exceeding external supply power that can be supplied from an external power supply through a power supply line. In a power supply device having auxiliary power supply means capable of supplying power to a certain power consumption circuit, the auxiliary power supply means is provided on a power input side of the power consumption circuit and has a power larger than the externally supplied power. A power-supply type auxiliary power supply unit capable of supplying power, wherein the power consumption detection unit detects power consumption of the power consumption circuit, and the power consumption circuit detects power consumption based on the power consumption detected by the power consumption detection unit. When the power consumption is predicted to exceed the externally supplied power, the auxiliary power supply means is selected; otherwise, the power supply line is selected and the selected auxiliary power supply means or power supply line is selected. It is characterized in the power supplied to and a selection means for supplying to said power circuit.

According to the present invention, for example, power required in a power consuming circuit such as an electronic circuit is supplied from an external power supply via a power supply line. At this time, the power consumption of the power consuming circuit is detected by a power consumption detecting means. Is detected. The auxiliary power unit is selected when the power consumption of the power consumption circuit is predicted to exceed the externally supplied power, which is the power supplied via the power supply line, based on the detected power consumption detected by the power consumption detection unit. Then, when the power supplied from the auxiliary power means is supplied to the power consuming circuit and the power consumption of the power consuming circuit is predicted not to exceed the externally supplied power, the power supply line is selected and the external power supplied from the power supply line is selected. The power is supplied to the power consumption circuit.

Therefore, in the case of a non-power-supply type auxiliary power supply means such as a battery, if the predetermined voltage cannot be obtained because the voltage decreases with power consumption, it is necessary to replace or charge the battery. However, the power is supplied to the power consuming circuit by the auxiliary power supply unit only when the external power supplied by the power supply line cannot cover the supply voltage. , The life of the auxiliary power supply means is extended, and the replacement or charging timing of the auxiliary power supply means is extended.

Further, the power supply device according to claim 2 of the present invention can supply power to a power consuming circuit that may consume power exceeding external supply power that can be supplied from an external power supply through a power supply line. In a power supply device provided with auxiliary power supply means, the auxiliary power supply means is provided on a power input side of the power consumption circuit and is a non-feeding type auxiliary power supply means capable of supplying power larger than the externally supplied power. Power consumption detection means for detecting power consumption of the power consumption circuit, and the auxiliary power supply to the external supply power when the power consumption detected by the power consumption detection means is predicted to exceed the external supply power Adding means for adding the power supplied from the power supply means and supplying the power to the power consuming circuit.

According to the present invention, the power required by the power consumption circuit such as an electronic circuit is supplied from the external power supply via the power supply line, and the power consumption of the power consumption circuit is detected by the power consumption detection means. Is done. Then, based on the power consumption detected by the power consumption detecting means, when the power consumption of the power consuming circuit is predicted to exceed the externally supplied power which is the power that can be supplied by the power supply line, the power adding means outputs The power from the auxiliary power supply means is added to the supplied power, and this is supplied to the power consuming circuit.

Therefore, in the case of a non-power-supply type auxiliary power supply means such as a battery, for example, it is necessary to replace or charge the battery when a predetermined voltage cannot be obtained because the voltage drops with power supply. Only when the externally supplied power cannot be covered, the power from the auxiliary power supply means is supplied to the power consuming circuit by, for example, adding only the shortage to the externally supplied power. The voltage drop of the power supply means can be suppressed, and the life of the auxiliary power supply means is extended correspondingly, so that the replacement or charging timing of the auxiliary power supply means is extended.

According to a third aspect of the present invention, in the power supply device, the auxiliary power supply means is formed so as to be chargeable, and utilizes a surplus of the externally supplied power excluding power consumed by the power consuming circuit. And charging the auxiliary power supply means.

According to the present invention, the auxiliary power supply means includes:
For example, a chargeable auxiliary power supply unit such as a battery, of the external supply power that can be supplied through a power supply line, using a surplus except for the power consumption in the power consumption circuit,
The auxiliary power supply means is charged.

Therefore, the auxiliary power supply means is automatically charged by the surplus of the external power supplied through the power supply line, so that the life of the auxiliary power supply means is extended correspondingly.

Further, the power supply device according to claim 4 of the present invention includes a storage voltage detecting means for detecting a voltage of the auxiliary power supply means and notifying the detected storage voltage when the detected storage voltage is lower than a predetermined voltage. It is characterized by.

According to the present invention, when the voltage of the auxiliary power supply means is detected by the storage voltage detection means, and when the detected storage voltage is lower than the predetermined voltage, for example, a notification is sent to a higher-level device via a signal line. The decrease in the storage voltage of the auxiliary power supply unit is notified. Therefore, when the storage voltage of the auxiliary power supply unit becomes low and this is detected and notified, at this time, for example, the auxiliary power supply unit is replaced.
Alternatively, if the auxiliary power supply means can be charged, by taking measures such as charging the auxiliary power supply means, it becomes possible to replace or charge the auxiliary power supply means at the end of its life.

[0018]

Embodiments of the present invention will be described below. First, a first embodiment of the present invention will be described.
FIG. 1 shows a case where the power supply device according to the first embodiment is applied to a power supply device of an electronic device.
Is composed of an electronic circuit (power consumption circuit) 2 and a power supply device 3, and is connected to, for example, a higher-level device (not shown) by a transmission cable 4. Information such as data or control signals is transmitted between the host device and the electronic circuit 2 by a signal line 4a comprising a plurality of signal transmission lines provided for each type of signal to be transmitted, which constitutes the transmission cable 4, for example. Is transmitted, and a predetermined voltage is supplied to the power supply device 3 through a power supply line (power supply line) 4b.

The power supply 3 is a power consumption detecting circuit (power consumption detecting means) for detecting the power consumption of the electronic circuit 2.
And a switching circuit (selection means) 12 controlled to be switched by the power consumption detection circuit 11, and a battery 13.

The switching circuit 12 is composed of, for example, a changeover switch. The power supply line 4b is connected to one contact 12a. The other contact 12b is connected to a battery (auxiliary power supply means).
13 are connected. Then, the contact 12c and the contact 1
2a is connected to the electronic circuit 2 via the power consumption detection circuit 11 when the power supply line 4b is connected to the electronic circuit 2. When the contact 12c and the contact 12b are connected, the battery The power that can be supplied from the power supply 13 is supplied to the electronic circuit 2 via the power consumption detection circuit 11.

In the power consumption detecting circuit 11,
The power consumption of the electronic circuit 2 is detected, and when the power consumption is lower than a predetermined power such as a power that can be supplied by a preset power supply line 4b, the switching circuit 12 is controlled to control the contact points 12a and 12c. And the power supply line 4b supplies power to the electronic circuit 2. When the power consumption exceeds a predetermined power, the switching circuit 12 is controlled to make the contacts 12b and 12c conductive so that the battery Power is supplied from 13 to the electronic circuit 2.

Therefore, when the power consumption of the electronic circuit 2 is small, the electronic circuit 2 is operated by the power supplied from the outside through the power supply line 4b. Only when it is predicted that the power supplied by the line 4b is insufficient, the power is supplied from the battery 13, so that the decrease in the storage amount of the battery 13 can be suppressed. Can be extended.

Next, a second embodiment of the present invention will be described. The second embodiment is the same as the first embodiment except that the configuration of the power supply device 3 is different.
The same reference numerals are given to the same parts, and the detailed description is omitted.

The power supply device 3 according to the second embodiment comprises:
A power consumption detection circuit (power consumption detection means) 11 for detecting power consumption of the electronic circuit (power consumption circuit) 2, a power addition circuit (addition means) 15 controlled by the power consumption detection circuit 11, and a battery ( Auxiliary power supply means) 1
And 3. The power consumption detection circuit 11 detects the power consumption of the electronic circuit 2 and controls the power addition circuit 15 based on the power consumption of the electronic circuit 2 and the power that can be supplied by the preset power supply line 4b. The power required by the electronic circuit 2 is formed by the power adding circuit 15 and supplied to the electronic circuit 2.

The power adding circuit 15 adds the power that can be supplied from the power supply line 4b and the power that can be supplied from the battery 13, and of the power supplied from the battery 13, The amount of addition to be added to the power that can be supplied is adjusted by the power consumption detection circuit 11. Then, of the power that can be supplied by the battery 13, a predetermined amount of power adjusted by the power consumption detection circuit 11 and the power that can be supplied by the power supply line 4 b are added, and this is added through the power consumption detection circuit 11. To the electronic circuit 2.

Therefore, when the power consumption of the electronic circuit 2 is within the predetermined power that can be supplied by the power supply line 4b, the power supplied by the power supply line 4b is directly supplied to the electronic circuit 2 via the power consumption detection circuit 11. , While
When the power consumption of the electronic circuit 2 exceeds the predetermined power, the power from the battery 13 is added to the power supplied by the power supply line 4b by the power consumption detection circuit 11 by an amount that cannot be covered by this power. It will be supplied to the electronic circuit 2. Therefore, the amount of power consumption from the battery 13 can be minimized, and the charge or replacement cycle of the battery 13 can be extended accordingly.

Next, a third embodiment of the present invention will be described. The third embodiment is the same as the second embodiment except that a charging / discharging circuit 17 is added to the power supply device 3, and therefore, the same portions are denoted by the same reference numerals and detailed description thereof. Is omitted.

The power supply device 3 according to the third embodiment comprises:
A power consumption detection circuit 11 for detecting power consumption of the electronic circuit 2, a power addition circuit 15 controlled by the power consumption detection circuit 11, a battery 13, and a charge / discharge for controlling charging and discharging of the battery 13 And a circuit 17.

The charge / discharge circuit 17 is connected between the power supply line 4b and the power adding circuit 15, and the battery 13 is connected to the charge / discharge circuit 17. This charge / discharge circuit 17
Is controlled by, for example, the power consumption detection circuit 11 or the like,
It is formed so that charging to the battery 13 and power from the battery 13 can be supplied to the electronic circuit 2 via the power consumption detection circuit 11. When the power addition circuit 15 is controlled such that the addition of the power supplied by the battery 13 becomes zero, the charge / discharge circuit 17 outputs the electronic circuit 2 of the power supplied by the power supply line 4b. It operates to charge the battery 13 by the surplus amount excluding the power consumption in the above. On the other hand, when the power adding circuit 15 operates to add the added amount of the power supplied by the battery 13 to the power supplied by the power supply line 4b, the charging / discharging circuit 17
Operates to discharge the battery 13.

Therefore, when the power consumption of the electronic circuit 2 is small, the power consumption detection circuit 11
In 5, the electronic circuit 2 operates to supply only the electric power supplied by the power supply line 4b to the electronic circuit 2, and the electronic circuit 2 operates by the electric power supplied by the power supply line 4b. When the power consumption of the electronic circuit 2 is small, the battery 13 is charged by a surplus of the power supplied by the power supply line 4b excluding the power consumption of the electronic circuit 2.

On the other hand, if the power consumption of the electronic circuit 2 is large, the power consumption detection circuit 11 detects that the power consumption of the electronic circuit 2 exceeds the power supplied by the power supply line 4b, and the power addition circuit 15 Control. And the electronic circuit 2
Battery 13 according to the shortage of power required by
Is adjusted by adding the amount of power supplied from. Thereby, power corresponding to the power consumption of the electronic circuit 2 is supplied to the electronic circuit 2. At this time, since there is no surplus in the power supplied by the power supply line 4b, the battery 13 is not charged.

Therefore, the same operation and effects as those of the second embodiment can be obtained, and in the third embodiment, when the power consumption of the electronic circuit 2 is small, the power supply line 4
Since the battery 13 is charged by the power supplied through the battery b, the power supplied through the battery 13 can be effectively used, and the replacement or charging cycle of the battery 13 can be further extended. Can be.

When charging is performed in the charging / discharging circuit 17, the battery 13 may be charged after discharging the stored voltage, thereby extending the life of the battery 13 itself. Can be done.

In the third embodiment, the case where the battery 13 is charged in the second embodiment has been described. However, the third embodiment may be applied to the first embodiment. It is.

Next, a fourth embodiment of the present invention will be described. The fourth embodiment is the same as the second embodiment except that a voltage detection circuit 19 is added to the power supply device 3. Description is omitted.

The power supply device 3 according to the fourth embodiment comprises:
A power consumption detection circuit 11 for detecting the power consumption of the electronic circuit 2; a power addition circuit 15 controlled by the power consumption detection circuit 11; a battery 13; and a voltage detection circuit (voltage storage circuit) for detecting the voltage of the battery 13. (Detection means) 19.

The voltage detection circuit 19 detects the voltage of the battery 13, and when the detected voltage falls below a predetermined voltage value such as a voltage value usable as a battery, for example.
The lowering of the stored voltage of the battery 13 is notified to the higher-level device via the abnormality notification signal line among the signal lines 4a of the transmission cable 4.

Therefore, when the power consumption of the electronic circuit 2 is large, the power adding circuit 15 operates so that the power supplied from the battery 13 is added to the power supplied through the power supply line 4b and supplied to the electronic circuit 2. However, when this state continues, the stored voltage of battery 13 decreases. Then, when the stored voltage of the battery 13 decreases and falls below a predetermined voltage, the voltage detection circuit 19 detects this and notifies the host device of the voltage decrease of the battery 13 via a signal line for abnormality notification.

As a result, the battery 1 is
3 can be recognized, that is, the necessity of replacing or charging the battery 13 can be recognized. Therefore, it is possible to detect the point at which charging or replacement is required according to the state of charge of the battery 13, so that it is possible to accurately detect the replacement or charging timing of the battery 13. For example, the charging or replacement is still performed. It is possible to avoid charging or replacing the battery when it is not necessary.

Therefore, the same operation and effect as those of the second embodiment can be obtained, and the replacement or charging timing of the battery 13 can be recognized in accordance with the state of charge of the battery 13. Replacement or charging can be performed only when necessary.

In the fourth embodiment, the case where the present invention is applied to the second embodiment has been described. However, it is also possible to apply the present invention to, for example, the third embodiment. Since the battery 13 is charged by the surplus power to the electronic circuit 2, the replacement of the battery 13 or the charging timing can be further extended.

In each of the above embodiments, a case has been described in which an electronic circuit is applied as a power consuming circuit. However, the present invention is not limited to this, and a circuit in which power is supplied from an external power supply via a power supply line is provided. If applicable, they can be applied.

[0043]

As described above, according to the first aspect of the present invention,
According to the power supply device according to the power consumption circuit,
Only when it is predicted that the external power that can be supplied through the power supply line is exceeded, the external power is changed to the external power and the power supplied from the auxiliary power supply is supplied to the power consumption circuit. As a result, the life of the auxiliary power supply means can be extended, and the charging or replacement timing can be extended accordingly.

According to the power supply device of the second aspect of the present invention, when the power consumption of the power consuming circuit is predicted to exceed the external power supplied through the power supply line,
Since the power supplied from the auxiliary power supply means is added to this externally supplied power and supplied to the power consuming circuit, the power is supplied from the auxiliary power supply means only when the externally supplied power is not enough. The power consumption of the power supply means can be reduced, and accordingly, the life of the auxiliary power supply means can be extended, and the charging or replacement timing can be extended.

According to the power supply device of the third aspect of the present invention, of the externally supplied electric power that can be supplied through the power supply line, a surplus power excluding the power consumption in the power consumption circuit is used to provide the auxiliary power supply means. To charge the battery,
The life of the auxiliary power supply means can be extended, and the timing of charging or replacement can be further extended.

Further, according to the power supply device of the fourth aspect of the present invention, when the storage voltage detection means detects a decrease in the storage voltage of the auxiliary power supply means, this is notified to, for example, a host device. Thus, by charging or replacing the auxiliary power supply means at this time, charging or replacement at an appropriate time according to the state of the auxiliary power supply means can be performed.

[Brief description of the drawings]

FIG. 1 is an example of a power supply device according to a first embodiment.

FIG. 2 is an example of a power supply device according to a second embodiment.

FIG. 3 is an example of a power supply device according to a third embodiment.

FIG. 4 is an example of a power supply device according to a fourth embodiment.

FIG. 5 is an example of a conventional power supply device.

FIG. 6 is an example of a conventional power supply device.

FIG. 7 is an example of a conventional power supply device.

[Explanation of symbols]

 2 electronic circuit 3 power supply device 4 transmission cable 11 power consumption detection circuit 13 battery 15 power addition circuit 17 charge / discharge circuit 19 voltage detection circuit

Claims (4)

[Claims] 1. A power supply device comprising an auxiliary power supply means capable of supplying power to a power consumption circuit which may consume power exceeding external supply power which can be supplied from an external power supply through a power supply line, Auxiliary power supply means is a non-feeding type auxiliary power supply means provided on a power input side of the power consumption circuit and capable of supplying power larger than the externally supplied power, and reduces power consumption of the power consumption circuit. Selecting the auxiliary power supply means when the power consumption of the power consumption circuit is predicted to exceed the externally supplied power based on the power consumption detection means to be detected and the detected power consumption detected by the power consumption detection means; In the case of (1), there is provided an auxiliary power supply unit that selects the power supply line and a selection unit that supplies power supplied from the power supply line to the power consumption circuit. Power supply. 2. A power supply device comprising auxiliary power supply means capable of supplying power to a power consumption circuit which may consume power exceeding external supply power which can be supplied from an external power supply through a power supply line, Auxiliary power supply means is a non-feeding type auxiliary power supply means provided on a power input side of the power consumption circuit and capable of supplying power larger than the externally supplied power, and reduces power consumption of the power consumption circuit. Power consumption detecting means for detecting, and when the detected power consumption detected by the power consumption detecting means is predicted to exceed the externally supplied power, adding the power supplied from the auxiliary power supply means to the externally supplied power, A power supply device comprising: an addition unit that supplies the power consumption circuit. 3. The auxiliary power supply means is formed so as to be chargeable, and charges the auxiliary power supply means using a surplus of the externally supplied power excluding power consumed by the power consumption circuit. 3. The method according to claim 1, wherein
The power supply as described. Detecting a voltage of said auxiliary power supply means,
The power supply device according to any one of claims 1 to 3, further comprising a storage voltage detection unit configured to notify when the detected storage voltage is lower than a predetermined voltage.