JPH038043Y2 - - Google Patents

Description

[Detailed explanation of the idea] Industrial applications The present invention relates to an improvement in a battery charger.

BACKGROUND ART Generally, a charger for charging a battery starts operating a timer (first timer) after the battery voltage reaches a certain potential, and stops charging after a set time has elapsed.

Furthermore, during the above charging, if the first timer does not time up, the charging state will continue indefinitely.
In addition to overcharging the battery, a second timer is installed to regulate the total charging time from the start of charging to the time when charging is stopped in consideration of the above phenomenon, which may lead to an accident.

Problems to be Solved by the Invention During charging, charging is generally stopped by the first timer, so even if the second timer is malfunctioning, there is a very low probability that it will be discovered.

Therefore, when the first timer does not time up due to a malfunction of the first timer or a malfunction of the voltage relay, etc., if the second timer is malfunctioning, backup by the second timer will not be possible and the charging state will continue, which is the worst case scenario. , leading to an accident.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is characterized in that the operation of the second timer is checked for each charge.

Function The present invention enables early detection of malfunctions through the above-mentioned timer check, leading to accident prevention.

Example An embodiment of the present invention will be described with reference to the drawings.

The drawing is a block diagram centered on a timer section for explaining an embodiment of the present invention, and includes a first timer and a second timer, and each timer is operated only when an alternating current voltage is present. In the event of a power outage, the timer will stop.

1st by charging ON command 1 on condition of AC detection 2
The oscillators 3 and 4 for the timer and the second timer start operating, and the second timer divides the output pulse of the oscillator 4 by, for example, 600/1 by the frequency divider 9, and starts counting by the counter 8, counting a predetermined time. do.

The first timer indicates that the battery voltage increases as charging progresses; for example, in a lead-acid battery, the battery voltage increases to 2.4V/
The reference voltage 6 is set so that the counter 7 starts operating when the cell voltage is reached. If the counter 7 for the first timer counts up before the counter 8 for the second timer does not count up, the charging stop command 12 is issued and the second timer
A pulse with a shorter period than the normal pulse obtained by dividing the output pulse of the timer oscillator 4 is sent to the counter 8.
input to accelerate, fast forward the second timer and time up in a short time (when the frequency is divided by 600/1, it will be shortened to 600/1 time), and the first timer,
A charger normality display 13 is performed to indicate that the operation of the second timer is normal.

At this time, if the counter 8 does not count up, the third timer composed of the oscillator 10 and the counter 11, which is set to, for example, 1.2 times the fast-forward time of the second timer, finishes counting and displays the second timer failure indication 15.

If the first timer does not time up, the second timer times up and a charger abnormality display 14 is displayed to indicate that the first timer does not operate.
The reason why the first timer does not time up is not only a failure of the first timer itself but also a malfunction of the DC detection 5.

Effects of the invention As mentioned above, since the timer operation is checked every time it is charged, it has great practical value, such as being effective in preventing accidents from occurring.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the present invention. 1...Charging ON/OFF command, 2...AC detection,
3... Oscillator for the first timer, 4... Oscillator for the second timer, 5... DC detection, 6... Reference voltage, 7... Counter for the first timer, 8...
Counter for second timer, 9... Frequency divider for second timer, 10... Oscillator for third timer, 11... Counter for third timer, 12
...Charging stop command, 13...Charger normal display, 1
4... Charger abnormality display, 15... Second timer failure display.

Claims (1)

[Scope of utility model registration request] In a charging circuit having a first timer that starts operation after the battery voltage reaches a certain potential and stops charging after counting a set time, and a second timer that starts counting at the same time as charging starts and controls the total charging time, Charging characterized by having a function of fast-forwarding the second timer from the time when the first timer times up, causing the second timer to time up, and confirming at each charge that both the first timer and the second timer are operating normally. vessel.