JPH09191564A - Power supply circuit for aggregate battery and battery operating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a power supply circuit by which energy can be supplied to an internal circuit without giving the influence of a noise by a method wherein an aggregate battery in which (n) pieces of battery blocks are cascade-connected is installed and (n) pieces of terminal pairs which supply voltages across both ends of them to the outside are installed. SOLUTION: A power supply circuit 1 for an aggregate battery is constituted of the aggregate battery 10 and of terminals 18 to 28 which are connected to a plurality of lines derived from the aggregate battery 10. The aggregate battery 10 is constituted by connecting four 2.2V battery cells in series. In addition, a terminal 12 and a terminal 16 are connected across both ends of the aggregate battery 10, and the terminal 16 is connected to a ground. Consequently, a voltage of 8.8V can be supplied from a part between the terminal 12 and the terminal 16. A terminal 14 is connected to a part between a battery cell 2 and a battery cell 3 so as to divide a battery cell 1 and the battery cell 2 as well as the battery 3 and the battery cell 4. Consequently, a voltage of 4.4V can be supplied respectively from a part between the terminal 12 and the terminal 14 as well as a part between the terminal 14 and the terminal 16. As a result, energy can be supplied to an internal circuit without giving the influence of a generated noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an assembled battery power supply circuit and a battery operating device, and more particularly to an assembled battery power supply for efficiently supplying a voltage from an assembled battery in a portable device such as a portable wireless device to an internal circuit. The present invention relates to a supply circuit and a battery operated device.

[0002]

2. Description of the Related Art Conventionally, in a wireless device such as a portable wireless device, when supplying a power supply voltage to an internal circuit, a battery having a value larger than a maximum power supply voltage value required for the operation of the internal circuit is used. The voltage required for each internal circuit was generated and supplied by a stabilizing circuit from the voltage value of the battery.

5 to 7 show an example of the configuration of a conventional assembled battery power supply circuit. In the power supply circuit of FIG. 5, a series dropper is used as the stabilizing circuit, in the power supply circuit of FIG. 6, a switching regulator is used as the stabilizing circuit, and in the power supply circuit of FIG. 7, DC- is used as the stabilizing circuit. It uses a DC converter.

In each configuration example, four 2.2V battery cells can be used to supply a voltage of 8.8V, and a stabilizing circuit or the like generates 4V. The voltage of 8.8V is supplied to, for example, the power amplification unit of the wireless device, and 4V is supplied to the other RF unit, baseband unit, and control unit.

[0005]

However, the above-described conventional power supply circuit for an assembled battery has the following problems. The series dropper used in the power supply circuit of FIG. 5 is not efficient. Therefore, in the device operating with the power supply circuit of FIG. 5, the capacity of the battery decreases rapidly, and the usable time of the device becomes short.

Further, in the switching regulator and the DC-DC converter used in the power supply circuits of FIGS. 6 and 7, noise is generated from the switching circuit and the oscillation circuit. Therefore, this noise may affect the operation of the wireless device. In view of the above problems, an object of the present invention is to provide an assembled battery power supply circuit for efficiently supplying the energy of the assembled battery to the internal circuit without affecting noise or the like.

Another object of the present invention is to provide a battery-operated device which can prolong the usage time of the device which operates on the assembled battery.

[0008]

Means for Solving the Problems To solve the above problems, the present invention is characterized by taking the following means. In the invention device according to claim 1, in an assembled battery power supply circuit, an assembled battery in which n (integer of 2 or more) battery blocks each including at least one battery cell are cascade-connected, and the n battery N terminal pairs for supplying the voltage across each of the battery blocks to the outside.

According to a second aspect of the present invention, in a battery-operated device, each n includes at least one battery cell.
An assembled battery in which (between 2 and more) battery blocks are connected in cascade, n terminal pairs for supplying the voltage across each of the n battery blocks to the outside, and the n battery blocks. N connected to each of the terminal pairs and having substantially the same operating current
Circuit blocks, and each of the n battery blocks discharges similarly.

In the invention device according to claim 3, in the assembled battery power supply circuit according to claim 1, the comparators that compare the capacities of the n battery blocks and indicate which battery block has the larger capacity. A switch for selecting a battery block designated by the comparator among the n battery blocks, and an (n + 1) th terminal pair for supplying the voltage across the battery block selected by the switch to the outside. Is further included.

According to a fourth aspect of the present invention, in the battery operating apparatus according to the second aspect, the capacities of the n battery blocks are compared with each other, and a comparator for indicating the battery block having the larger capacity is provided. a switch for selecting a battery block designated by the comparator among the n battery blocks; an (n + 1) th terminal pair for supplying the voltage across the battery block selected by the switch to the outside; N circuit blocks connected to each of the terminal pairs and having substantially the same operating current;
An n + 1th circuit block connected to a first terminal pair, wherein the n + 1th circuit block is connected to one of the n battery blocks having a larger capacity, Are discharged in substantially the same manner.

According to a fifth aspect of the present invention, in the battery operating device according to the fourth aspect, the n + 1th circuit block has an operating current larger than the maximum value of the difference between the operating currents of the n circuit blocks. It is characterized by having.

According to a sixth aspect of the present invention, in the assembled battery power supply circuit according to the third aspect, the comparator compares the voltages of the n battery blocks,
It is characterized in that it has a circuit for instructing a battery block having a higher voltage.

According to a seventh aspect of the present invention, in the battery operating apparatus according to the fourth aspect, the comparator compares the voltages of the n battery blocks and indicates which battery block has the higher voltage. It is characterized by having a circuit.

According to an eighth aspect of the present invention, in the assembled battery power supply circuit according to the first or third aspect, the voltage across each of the n battery blocks is substantially equal. . The invention device according to claim 9 is the battery operation device according to claim 2 or 4, characterized in that the voltage across each of the n battery blocks is substantially equal.

The above-mentioned invention device operates as follows. In the assembled battery power supply circuit according to claim 1 and the battery operating device according to claim 2, the assembled battery is divided into a plurality of blocks on a cell-by-cell basis and supplied to each internal circuit, thereby reducing voltage conversion loss. It is possible to eliminate the influence of noise generated by voltage conversion.

A power supply circuit for an assembled battery according to claim 3,
In the battery operating device according to claim 4 or 5, the n + 1-th circuit block is connected to one of the n battery blocks having a larger capacity, and each of the n battery blocks is substantially It can be discharged as well.
Therefore, in the present circuit and device, the loss of voltage conversion can be eliminated, the influence of noise generated by voltage conversion can be eliminated, and the assembled battery can be used efficiently. As a result, the operating time of the battery operated device can be extended. Further, the efficient use of the assembled battery can reduce the redundant capacity, and thus the device such as the radio can be downsized.

A power supply circuit for an assembled battery according to claim 6,
In the battery operating device according to the seventh aspect, the comparator compares the voltages of the battery blocks. This is because there is a correlation between the voltage and the capacity of the battery block. Therefore, the comparator can be configured with a simple circuit for comparing the voltages.

A power supply circuit for an assembled battery according to claim 8,
In the battery operating device according to claim 9, the voltage across each of the n battery blocks is substantially equal. Therefore, the present power supply circuit can be efficiently applied to a device having many circuit blocks operating at the same voltage.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION First, a first embodiment of an assembled battery power supply circuit according to the present invention will be described. FIG.
FIG. 1 is a block configuration diagram of a first embodiment of a battery operating device including an assembled battery power supply circuit according to the present invention.

In FIG. 1, an assembled battery power supply circuit 1
Is composed of the assembled battery 10 and terminals 18 to 28 connected to a plurality of lines drawn from the assembled battery 10. In the present embodiment, the assembled battery 10 has four 2.2 V battery cells.
It is configured by connecting in series. As the battery cell, for example, a lithium battery can be used.

At both ends of the assembled battery 10, terminals 12 and 1 are provided.
6 is connected, and the terminal 16 is further connected to the ground. Therefore, a voltage of 8.8 V can be supplied between the terminals 12 and 16. Further, between the battery cell 2 and the battery cell 3 of the assembled battery 10, the battery cells 1 and 2 are provided.
, And the terminal 14 is connected so as to separate the battery cells 3 and 4. Therefore, a voltage of 4.4 V can be supplied between the terminals 12 and 14 and between the terminals 14 and 16.

The 8.8V voltage between terminals 12 and 16 is from the terminals 18 and 20 operating at 8.8V.
It is supplied to the 8V system circuit block. Terminal 12 and terminal 14
The 4.4V voltage between terminals 22 and 24,
It is supplied to the circuit of the 4.4 V first circuit block which operates at 4 V. The 4.4V voltage between terminals 14 and 16 is
4.4V operating at 4.4V from terminals 26 and 28
It is supplied to the circuit of the system second circuit block.

For example, in a radio device or the like, the above 8.8V system circuit block includes a transmission power amplifying unit and the like, the 4.4V system first circuit block includes other RF circuits, and further the 4.4V system. The second circuit block can include a modulator / demodulator, a baseband circuit, a controller, and the like.

As described above, in the battery operating device using the assembled battery, the assembled battery is divided into a plurality of blocks on a cell-by-cell basis and supplied to each internal circuit, whereby the voltage conversion loss can be eliminated and the voltage conversion can be eliminated. The effect of noise generated by the can be eliminated. However, if there is a difference between the operating current of the 4.4V system first circuit block and the operating current of the 4.4V system second circuit block, one of the group of battery cells 1 and 2 and the group of battery cells 3 and 4 becomes Batteries discharge faster. in this case,
Despite the capacity of one set of battery cells remaining, the operation of the circuits connected to the remaining set stops first. As a result, the operation of the entire battery operated device is stopped.

Therefore, the 4.4 V first circuit block,
The 4.4V system second circuit block needs to be divided into blocks so that their operating currents are substantially equal. The operating current of the 4.4V system first circuit block is
When set to be substantially equal to the operating current of the 4.4 V second circuit block, the capacity of each battery cell of the assembled battery 10 is reduced in the same manner over time, so that the assembled battery can be used efficiently. it can. As a result, the usable time of the battery operated device can be extended.

However, depending on the circuit configuration, it may be 4.4V.
In some cases, it may be difficult to divide the system first circuit block and the 4.4V system second circuit block into blocks so that their operating currents are substantially equal. Such a case can be solved by the second embodiment of the assembled battery power supply circuit of the present invention described below.

The second embodiment of the assembled battery power supply circuit according to the present invention will be described below. FIG. 2 is a block diagram of a second embodiment of a battery operating device including an assembled battery power supply circuit according to the present invention. The power supply circuit 2 shown in FIG. 2 further includes a switch 30 and a comparator 40 as compared with the power supply circuit 1 shown in FIG. Other configurations are the same as those of the power supply circuit 1 shown in FIG. 1, and elements having the same functions are designated by the same reference numerals.

In the assembled battery power supply circuit 2 shown in FIG. 2, the assembled battery 10 is similar to the power supply circuit 1 of FIG.
Is composed of four 2.2V battery cells and has a terminal 1
8.8V voltage can be supplied from between 8 and terminal 20,
A voltage of 4.4 V can be supplied between the terminals 22 and 24 and between the terminals 26 and 28, respectively.

In the power supply circuit 2 shown in FIG. 2, a switch 30 is further provided, and a switch 30 between the terminals 12 and 14 is provided.
Either the 4 V voltage or the 4.4 V voltage between the terminals 14 and 16 is applied to the 4.4 via the terminals 32 and 34.
It can be supplied to the V-system third circuit block. That is, switch 3
By 0, the 4.4V system third circuit block is added to one of the first and second circuit blocks.

Further, a comparator 40 is further provided, and compares the voltage between the terminals 12 and 14 with the voltage between the terminals 14 and 16, and compares the voltage between the terminals with the higher voltage with 4.
Switch 30 to connect 4V system third circuit block
Control. FIG. 3 shows a configuration example of the comparator 40. The comparator 40 has two input terminals 42 and 4
Four. The input terminal 42 is connected to the terminal 12 of the power supply circuit 2 and supplied with 8.8V. Input terminal 4
4 is connected to the terminal 14 of the power supply circuit 2 and 4.4V
4.4 V supplied to the circuit of the second circuit block of the system is supplied. At this time, 8.8 V supplied to the input terminal 42
Is divided into two by resistors R1 and R2 having the same resistance value and input to the comparator 40.

For example, suppose that the voltage across battery cells 1 and 2 supplied to the circuit of the first circuit block is Va, and the voltage across battery cells 3 and 4 supplied to the circuit of the second circuit block is Vb. , In the comparator 40, Vb and (V
a + Vb) / 2. This comparison is actually
It is equivalent to a comparison between Vb / 2 and Va / 2. Therefore, the configuration of the comparator 40 makes it possible to compare the magnitudes of Vb and Va.

Further, the 4.4V system circuits of the first, second and third circuit blocks are determined so that the ratio of their respective operating currents is, for example, 4.5: 4.5: 1. That is, the 4.4V related circuits of the first and second circuit blocks have substantially the same operating current, but the operating currents may have a slight difference. In this case, when the 4.4V system circuit of the third circuit block is added to one of the 4.4V system circuits of the first and second circuit blocks, the operating current on the added side is the same as that of the remaining circuit blocks. It must be larger than the operating current.

For example, in a radio device or the like, the above 8.8V system circuit block includes a transmission power amplifying section and the like, the 4.4V system first circuit block includes other RF circuits, and further the 4.4V system. The second circuit block includes a modulator / demodulator, a baseband circuit, a part of a control unit, etc.
The circuit block may include the remaining controls.

Under the above conditions, in the present power supply circuit 2, the voltage between the terminals 12 and 14 is compared with the voltage between the terminals 14 and 16 by the comparator 40, and the voltage of the switch 30 is high. 4.4 on one terminal
The V-system third circuit block is connected. Generally, when the capacity of a battery decreases, the voltage of the battery tends to decrease.
Conversely, a high battery voltage indicates that the battery has a large capacity.

FIG. 4 is a diagram showing the operation of the second embodiment of the power supply circuit according to the present invention. The horizontal axis represents time, and the vertical axis represents the voltage of the battery cell divided into two. Comparator 4
A set of battery cells having a larger capacity in the battery is detected by 0, and the circuit of the third circuit block is connected to the set.
That is, it is connected to a circuit with a small operating current. After that, the set of battery cells having a large capacity discharges quickly, and eventually the capacity becomes lower than the remaining set of battery cells. At this time, the circuit of the third circuit block is again connected to the battery having the large capacity by the comparator 40 and the switch 30.

By repeating the above, the two divided battery cells can be discharged in substantially the same manner. Therefore, this power supply circuit can eliminate the loss of voltage conversion,
The effect of noise generated by voltage conversion can be eliminated and the assembled battery can be used efficiently. As a result, the operating time of the battery operated device can be extended.
Further, the efficient use of the assembled battery can reduce the redundant capacity, and thus the device such as the radio can be downsized.

The comparison of the battery voltage in the comparator 40 and the switching in the switch 30 are constant after the transmission is turned on, for example, in the case of the press talk type wireless device, every time the transmission is turned on, or when the transmission is always on during a call. Can be operated at each timing. When the above circuit is operated in the transmission state, the battery voltage can be measured under a state where a large load is applied during transmission. This behavior is
A gate 50 is provided after the comparator shown in FIG.
This can be done by controlling the gate 50.

The above description of the embodiment of the power supply circuit has been made for the case of being applied to a portable radio device. But,
The assembled battery power supply circuit according to the present invention is not limited to application to a portable wireless device. The present invention is applicable to any device that operates on an assembled battery.

Further, in the above description of the embodiment of the power supply circuit, the case where the assembled battery composed of four battery cells is divided into two equal parts and substantially the same voltage is generated is shown. However, the present invention can be applied to the case where the voltages are generated unevenly and different voltages are generated. Thus, even if a plurality of circuits having different operating voltages are provided, it is not necessary to provide a stabilizing circuit for each. Furthermore, by connecting circuits having substantially the same operating current to the respective generated voltages, the discharge time of each battery cell can be made equal and the battery can be used efficiently.

The embodiment of the present invention has been described above.
It is needless to say that the present invention is not limited to these examples and that improvements and modifications can be made within the scope of the present invention.

[0042]

As described above, the present invention has the following effects. In the assembled battery power supply circuit according to claim 1 and the battery operating device according to claim 2, the assembled battery is divided into a plurality of blocks on a cell-by-cell basis and supplied to each internal circuit, thereby reducing voltage conversion loss. Can be removed,
Moreover, the influence of noise generated by voltage conversion can be removed.

A power supply circuit for an assembled battery according to claim 3,
In the battery operating device according to claim 4 or 5, the n + 1-th circuit block is connected to one of the n battery blocks having a larger capacity, and each of the n battery blocks is substantially It can be discharged as well.
Therefore, in the present circuit and device, the loss of voltage conversion can be eliminated, the influence of noise generated by voltage conversion can be eliminated, and the assembled battery can be used efficiently. As a result, the operating time of the battery operated device can be extended. Further, the efficient use of the assembled battery can reduce the redundant capacity, and thus the device such as the radio can be downsized.

A power supply circuit for an assembled battery according to claim 6,
In the battery operating device according to the seventh aspect, the comparator compares the voltages of the battery blocks. This is because there is a correlation between the voltage and the capacity of the battery block. Therefore, the comparator can be configured with a simple circuit for comparing the voltages.

A power supply circuit for an assembled battery according to claim 8,
In the battery operating device according to claim 9, the voltage across each of the n battery blocks is substantially equal. Therefore, the present power supply circuit can be efficiently applied to a device having many circuit blocks operating at the same voltage.

[Brief description of the drawings]

FIG. 1 is a block configuration diagram of a first embodiment of a battery operating device including an assembled battery power supply circuit according to the present invention.

FIG. 2 is a block configuration diagram of a second embodiment of a battery operating device including an assembled battery power supply circuit according to the present invention.

FIG. 3 is a configuration example of a comparator.

FIG. 4 is a diagram showing an operation of a second embodiment of the power supply circuit according to the present invention.

FIG. 5 is a configuration example of a conventional assembled battery power supply circuit.

FIG. 6 is a configuration example of a conventional assembled battery power supply circuit.

FIG. 7 shows a configuration example of a conventional assembled battery power supply circuit.

[Explanation of symbols]

 1, 2 Power supply circuit 10 Assembly battery 12 to 28 terminal 30 Switch 32, 34 terminal 40 Comparator 42 to 48 terminal 50 Gate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location H02J 7/00 302 H02J 7/00 302C // H01M 6/42 H01M 6/42

Claims (9)

[Claims] 1. An assembled battery in which n (integer of 2 or more) battery blocks each including at least one battery cell are cascade-connected, and a voltage across each of the n battery blocks is externally connected. A power supply circuit for an assembled battery, comprising n terminal pairs for supplying. 2. An assembled battery in which n (integer of 2 or more) battery blocks each including at least one battery cell are cascade-connected, and a voltage across each of the n battery blocks is externally connected. And n circuit blocks connected to each of the n terminal pairs and having substantially the same operating current, and each of the n battery blocks has the same structure. A battery-operated device characterized by being discharged. 3. A comparator that compares the capacities of the n battery blocks and selects the battery block with the larger capacity, and selects a battery block specified by the comparator from the n battery blocks. The assembled battery power supply circuit according to claim 1, further comprising a switch for operating the battery block, and an (n + 1) th terminal pair for supplying the voltage across the battery block selected by the switch to the outside. 4. A comparator that compares the capacities of the n battery blocks and selects the battery block with the larger capacity, and selects a battery block specified by the comparator from the n battery blocks. Switch, an n + 1th terminal pair for supplying the voltage across the battery block selected by the switch to the outside, and an n-th operating terminal connected to each of the n terminal pairs. Circuit blocks and an (n + 1) th circuit block connected to the (n + 1) th terminal pair, wherein the (n + 1) th circuit block is connected to one of the n battery blocks having a larger capacity. The battery operating device of claim 2, wherein each of the n battery blocks discharges in substantially the same manner. 5. The battery operating device according to claim 4, wherein the (n + 1) th circuit block has an operating current larger than a maximum value of a difference between operating currents of the n circuit blocks. 6. The assembled battery power source according to claim 3, wherein the comparator has a circuit that compares the voltages of the n battery blocks and indicates which battery block has the higher voltage. Supply circuit. 7. The battery operating device according to claim 4, wherein the comparator has a circuit that compares the voltages of the n battery blocks and indicates which battery block has the higher voltage. 8. The power supply circuit for the assembled battery according to claim 1, wherein the voltage across each of the n battery blocks is substantially equal. 9. The battery operating device according to claim 2, wherein the voltage across each of the n battery blocks is substantially equal.