JPH02246737A - Charging equipment - Google Patents

Abstract

PURPOSE:To prevent the overcharge of a battery by repeatedly starting charging when the battery is left as it is set and charging is stropped after the lapse of a given period of time. CONSTITUTION:An idle period is set after a specified charging period by a timer part 7 for measuring the specified charging period and a flip-flop circuit 8 for switching charge for every specified charging period and the idle period so that the total period is one day. That is, because one day is 24 hours charging is performed while e.g. 12 hours are set as the specified charging period and the charge is also set to stop for 12 hours after the completion of charging. Therefore, an intermittent charge is repeated while a 24-hours period is set as one cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a charging device for charging a secondary battery built into a portable radio or the like.

[Summary of the invention]

There are some devices that charge the battery by measuring the specified charging time with a built-in timer, but in this invention, if the battery is left in place, charging will stop and after a certain period of time, charging will start again. This is a charging device that performs intermittent charging.

[Conventional technology]

FIG. 3 shows a block diagram of a conventional charging circuit, and FIG. 4 shows a time chart of the conventional charging circuit. In FIG. 3, 1 indicates a start switch, 2 indicates a monomulti, and 3 indicates a charging section. Charging part 3
When the battery is set and the start switch 1 is turned on, the monomulti 2 is activated and charging starts. The charging start signal 4 in FIG. 4 corresponds to turning on the start SWI, and the charging signal 5 indicates the charging period. In this way, when the charging time ends, charging is stopped. In this way, the charging time is regulated using a timer to prevent overcharging of the battery.

[Problem to be solved by the invention]

As shown in the time chart of the conventional charging circuit in Figure 4,
The charging period signal 5 was designed to stop charging after a certain period of time. When charging stops, standby current flows in portable radios, etc. and consumes the battery, so if you set the battery and start charging the day before a holiday, for example, when the specified charging time comes, charging will stop. There was a drawback that the battery would stop and the discharge would proceed. Therefore, there was a problem in that the battery was not fully charged by the end of the holidays, and had already discharged more than 18 and a half times during standby, shortening the usage time of the battery. On the other hand, if you do not use the charging timer,
Since charging does not stop even after the specified charging time has been reached, the battery is continuously charged while not in use, resulting in overcharging, which has the disadvantage of significantly shortening the life of the battery.

[Means to solve the problem]

The present invention uses a timer unit that measures the specified charging time and a flip-flop unit that switches charging between the specified charging time and rest time, and provides a rest time after the specified charging time, so that the total of these times becomes one day. I set it like this.

[Effect]

There are 24 hours in a day, so set the specified charging time to 12 hours, and then charge the battery for 12 hours after charging is complete.
Set the time to pause charging. Therefore, intermittent charging will be repeated with 24 hours as one cycle,
Unless there are some exceptions, a full charge is guaranteed even after long-term use. For example, to explain an exception case, in the case of use from Monday to Saturday, for example, if Saturday is a half day, if you start charging after work on Saturday, the amount of discharge will be 8 to 9 hours even on Monday morning. This was within a range that had almost no effect on daily use.

〔Example〕

FIG. 1 is a block diagram of a charging device according to an embodiment of the present invention. FIG. 2 is a time chart illustrating the operation of the charging device according to the embodiment of the present invention. In FIG. 1, 7 is a timer, and the signal of the start switch 1 is input manually. The output 11 of the timer 7 is 8 flip-flops (hereinafter referred to as FF).
The output 12 of FF8 enters the charging section 9 and the trigger part 10, respectively. The output 13 of the trigger part 10 goes into the redrigger power of the timer 7. Since the timer 7 is a ridrigger type timer circuit, when the charge start signal shown in FIG. 2 14 is input, the timer 7 starts and the FF8
Inverts the output 12 and starts charging. When the timer ends after a certain period of time, 11 timer output signals are output, and FF8 output 1
2 is reversed and charging is stopped. Furthermore, the trigger part 10 detects an edge on the output 12 and issues a trigger signal 13 to reset and restart the timer 7.

〔Effect of the invention〕

In charging devices that are used every day for portable radios and campus pagers, the state of charge of the secondary battery is very important. Generally, over-discharging and over-charging are said to have a significant effect on shortening the life of a battery. Also, even if the battery is charged at its best, the number of times it is charged and discharged, that is, the number of days it has been used, will decrease by some percentage of its initial charging capacity. Therefore, with the charger device of the present invention, not only is the battery fully charged even after the battery has been used, but it is also possible to fully charge the battery no matter how many days there are holidays. Furthermore, if the item is not used that day, it may remain in the charger for a long period of time.
It is also very important to avoid overcharging, which means that charging must be stopped to some extent and a small amount of discharge must be allowed. The present invention fully satisfies these conditions.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a charging device according to an embodiment of the present invention. FIG. 2 is a time chart explaining the present invention in detail. Third
The figure is a block diagram of a conventional charging circuit. Figure 4 shows time chart 1 of a conventional charging circuit. No./Start SW/Mono multi/Charging part/Charging start signal/Charging signal building/Timer battle/Flip-flop...Charging part 10 φ - Trigger part or more

Claims (1)

[Claims] In a charging device for a portable electronic device having a secondary battery,
It consists of a charging circuit for the secondary battery, a flip-flop unit that switches the charging circuit, and a timer unit that periodically outputs a signal to the flip-flop unit, and stops charging after the charging time ends and continues for a certain period of time. A charging device characterized by repeatedly performing a series of operations of starting charging after a certain period of time has elapsed.