JPH02179229A - Charging type power supply device - Google Patents

Abstract

PURPOSE:To obtain the same action as that in case of parallel connection by providing a switching means connecting to a load by switching the plural number of pairs of series battery blocks of a charging type battery and a means controlling a switching time between each of battery blocks based on an output voltage of the battery blocks. CONSTITUTION:Battery blocks 2 and 3 consisting of a plurality of charging type batteries connected in series are provide to a load 4 in parallel, and an FET 5 or 6 of a switching element is inserted between the block 2 or 3 and the load 4. In case of V2=V3 in a comparator 7, a pulse with a duty ratio of 50% is supplied to the FET 5 or 6, in case of V2>V3, a pulse signal making an ON time of the FET 5 longer is outputted, and in case of V2<V3, a reverse pulse signal is output. According to the constitution, an arrangement is made without connecting in parallel, and the same action as that in case of parallel connection can be obtained.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a power supply device equipped with a plurality of rechargeable batteries, and more specifically, a rechargeable power supply device that can efficiently use a plurality of rechargeable batteries. This relates to power supplies.

(Conventional technology and problem to be solved) When multiple rechargeable batteries are connected in parallel and used, reverse charging occurs between the batteries due to individual differences between the batteries, and furthermore, due to this reverse charging, , it is known that problems such as shortened battery life and liquid leakage occur.

For example, when multiple Ni-Cd batteries are connected in parallel and used, even if the initial voltage of each battery is the same, as the charge and discharge cycles are repeated, the charge and discharge characteristics of each battery will vary, and the rate of capacity deterioration will increase. Due to the difference in battery voltage, a potential difference occurs between each battery, and reverse charging occurs from one battery to the other battery. This reverse charging not only impairs the life of the battery (and causes leakage, etc.) For this reason, conventionally, multiple rechargeable batteries are connected in parallel and used as a power source. There was no such thing, and they were simply used in series connection.

In view of this point, the purpose of the present invention is to provide a charging system that does not connect multiple rechargeable batteries in parallel (arranged), and that provides the same functional effect as if they were connected in parallel. The goal is to realize a rechargeable battery.

(Means for Solving the Problem) In order to achieve the above object, the present invention includes a switching means for alternately switching and connecting a plurality of sets of battery blocks made of rechargeable batteries to the load side, This makes it possible to obtain the same output as if the battery blocks were connected in parallel. Furthermore, the present invention includes switching control means to control the switching time between each battery block based on the output voltage of each battery block. By controlling the switching means by this means, the battery blocks with higher battery voltages are connected to the load side for a longer time (use time), so that each battery block is discharged almost uniformly.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

In the figure, ■ is a power source, which is composed of a plurality of battery blocks, in this example two sets of battery blocks 2 and 3. Each of these battery blocks 2.3 is connected in parallel to a load 4. An FET 5 is inserted between the battery block 2 and the load 4 as a switching element, and similarly, an FET 6 is inserted between the battery block 3 and the load 4.

On the other hand, 7 is a comparator whose input side is supplied with the output voltages V2 and V3 from the respective battery blocks 2.3, and whose output is supplied to the pulse generator 8. The output voltage of this comparator 7 becomes a constant preset voltage value when V1=V2, and becomes a voltage value higher than the set voltage according to the difference when V2>V3, and vice versa. When the voltage is V3, the voltage value is lower than the set voltage in accordance with the difference.

This pulse generator 8 outputs control outputs CI and C2 for controlling the above-mentioned FET 5.6 on and off.

To explain in detail, based on the output of the comparator 7, the voltage Vl
When it is detected that v2 and v2 are equal, as shown in FIG.
．． Supply to 6. When V2>V3, as shown in FIG. 3, the duty ratio is set to 5 as the control output CI in order to lengthen the on time of the FET 5 on the battery block 2 side.
A pulse signal exceeding 0% is output, and the other control output C2
is a pulse signal with a phase opposite to that of 01. V2<
At V3, a pulse signal opposite to this is output as shown in FIG.

In FIG. 1, a charging power source 11 is connected in parallel to each battery block 2.3.

Further, L and C are for removing noise during switching.

When a lithium battery with a large internal impedance was used as a battery block in a circuit with this configuration, it was confirmed that the power capacity was increased by about 20% compared to the conventional circuit.

(Effects of the Invention) As explained above, the rechargeable power supply device of the present invention includes a switching means for switching between a plurality of battery blocks, and a switching control means for controlling the switching means according to the output voltage of each battery block. It is equipped with Therefore, according to the present invention, it is possible to obtain almost the same output as when multiple battery blocks are connected in parallel, and since each battery block is used so that its discharge is uniform, the It is possible to avoid adverse effects such as reverse charging and liquid leakage. In addition to this, if some battery blocks fail and no output is obtained,
Since it is detected by the switching control means,
Another advantage is that the use of such defective battery blocks can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing the circuit configuration of an embodiment of the present invention, and FIGS. 2, 3, and 4 are waveforms of control outputs CI and C2 output from the pulse generator 8 in FIG. FIG. Power supply 3 - Battery block load FET Comparator pulse generator DC power supply 7 (￥P) Part 3 - (￥N distribution) Figure 4 (￥p<V3)

Claims (1)

[Claims] A switching means comprising a plurality of battery blocks each consisting of one or a plurality of rechargeable batteries connected in series, alternately connecting each of these battery blocks to a load side, and a supply voltage from each of the battery blocks. and switching control means for controlling the switching means to adjust the switching time between these battery blocks based on the value.