JPS5961435A - Charge controller for secondary battery containing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a charging control device for a device with a built-in secondary battery, which can effectively prevent overcharging of the secondary battery in a shaver or the like having a built-in secondary battery. Regarding.

[Technical background of the invention]

In recent years, devices with built-in rechargeable batteries, such as shapers, have become widely popular.

Conventionally, this type of secondary battery and equipment has generally been equipped with a charging control device having a configuration as shown in FIG.

That is, this type of device with a built-in secondary battery is equipped with a diode preamplifier for full-wave rectification of a commercial power source 1, a diode circuit 2, and a capacitor 3 for smoothing the output, and a blocking oscillator etc. with this rectified and smoothed output. The oscillating unit 4 is energized to charge the secondary battery 5. Note that 6 in the figure is a diode that rectifies the charging current of the secondary battery. The photoelectric control device is constructed such that the full-wave rectified and smoothed output is guided to a Zener diode 8 via a resistor 7, and is made into a constant voltage and applied to a timer to a circuit 9. This timer circuit 9 outputs a time-up signal after a time specified by a number at a time determined by a resistor 10 and a capacitor 11, thereby stopping the oscillation section 4.
Note that 12 in the figure is a smoothing capacitor connected in parallel to the Zener diode 8.

Thus, according to a device with a built-in secondary battery equipped with such a charging control device, the timer circuit 9 is energized when charging of the secondary battery 5 is started upon input of the commercial power source 1, and a time-up signal is output after a predetermined period of time has elapsed. is output, and charging of the secondary battery 5 is controlled to be stopped. Therefore, if the setting time of the timer circuit 9 is set to the time required to charge the secondary battery 5, it is possible to effectively control the photoelectricity without overcharging the secondary battery 5. Become.

[Problems with background technology]

However, in the above conventional device, the timer circuit 9
Since the operation of is controlled by turning on the power (connection of the Toriyo Kagogen 1), for example, if a power outage occurs while charging the secondary battery 5 and the power is turned on again, the timer times %9 will be reset from the initial state. There was a problem in that the secondary battery 5 was overcharged because the operation was started. In addition, even when charging is performed as described above before the charge stored in the secondary battery 5 is fully used up, there is a problem in that overcharging occurs as well. [Object of the Invention] This invention The invention was made in consideration of these circumstances, and its purpose is to provide a highly practical device with a built-in secondary battery that can easily and effectively prevent overcharging of a secondary battery. An object of the present invention is to provide a charging control device.

[Summary of the invention]

The present invention includes a comparator that compares a reference voltage with the charging voltage of the secondary battery in parallel with a timer circuit that controls the charging time of the secondary battery, and a comparator that detects a charging voltage that exceeds the reference voltage. Provides a latch circuit that is set to 8 when
The OR circuit detects the set-up signal of the timer circuit or the set output signal of the latch circuit to control charging of the secondary battery to be stopped.

〔Effect of the invention〕

Therefore, according to the present invention, even if the timer circuit is operating, when the comparator detects a predetermined charging voltage of the secondary battery, the charging of the secondary battery is stopped.
Therefore, overcharging of the secondary battery is effectively prevented.

Moreover, since the circuit configuration is simple, it is easy to incorporate it into a device with a built-in secondary battery, and its great effects such as high practicality are diminished. Further, even if a power outage or the like occurs during charging of the secondary battery, there is a tremendous effect that no problems like the conventional ones occur.

[Embodiments of the invention]

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

FIG. 2 is a schematic configuration diagram of the embodiment apparatus. The same parts as those of the conventional apparatus shown in FIG.

The feature of this device is that the timer cycle 'fNr9
In addition, there is a comparator 13 that compares the photoelectric voltage of the secondary battery 5 with a reference voltage and outputs a set signal when the charging voltage exceeds the reference voltage, and a ceratomagnetic signal of this comparator 13. It is equipped with a latch circuit 14 for latching, and an OR circuit 15 for inputting the set signal of the latch circuit 14 and the time-up signal of the timer circuit 9 to stop and control the charging operation of the secondary battery 5 by the oscillation section 4. The point is that there is. The comparator 13 detects the terminal voltage of the secondary battery 5 through a filter circuit including a resistor 16 and a capacitor 17.
That is, the charging voltage is input to one input terminal, and a predetermined reference cylinder pressure is input to the other input terminal.

This reference voltage is applied to resistors 1B, 19 . A series circuit consisting of diodes 20 and 21 divides a predetermined voltage made constant by the Zener diode 8.

However, this reference lever pressure is, for example, the groove light 'i' of the secondary battery.
a is set to about 90 inches of pressure f+N. Further, the set time of the timer circuit 9 is such that the accumulated charge of the secondary battery 5 is
From the state of , it is charged to 80% of its full charge! The charging time is set to reach fi.

According to this device configured in this manner, when the secondary battery 5 is charged from an empty state, the comparator 13 becomes
Before outputting the R signal, the timer circuit 9 outputs a set-up signal after a period of time corresponding to the amount of charge of 80 chips.
This is applied to the oscillator 4 via the OR circuit 15, and charging of the secondary battery 5 is controlled to be stopped. If a power outage occurs during charging of the secondary battery 5 and the power is turned on again, the timer circuit 9 will restart its timekeeping operation from the beginning. Therefore, the amount of charge of the secondary battery 5 may exceed 80ch before the set-up signal is output, but in this case, the comparator 13 detects the amount of charge of 90q6 and sets the latch circuit 14. The oscillation section 4 is controlled to stop by the output of the latch circuit 14 via the logical OR circuit (5). As a result, charging of the secondary battery 5 is stopped before overcharging occurs. Furthermore, when the secondary battery 5 is charged before it becomes empty, the charging voltage reaches 80% before the set time of the timer circuit 9 is reached.
%, but even in this case, the comparator 13 detects the charging voltage of the secondary battery 5 that has reached 90%, and the charging is controlled to be stopped. As a result, overcharging of the secondary battery 5 is effectively prevented.

Note that even if the charging voltage value of the secondary battery 5 fluctuates somewhat during the charging operation, when the charging voltage exceeds the specified value of 90q6, the latch circuit 14 latches the set signal of the comparator 13 and outputs the oscillator. 4, the charging control will not become unstable.

As explained above, according to the device of the present invention, the secondary battery 5
can reliably prevent overcharging. Overcharging can be reliably prevented without being affected by the condition of the secondary battery 5 at the start of charging or a power outage during charging, and this is an effective method for charging the secondary battery 5. can be controlled. Therefore, effects such as being able to sufficiently ensure the safety of charging work can be achieved.

Note that the present invention is not limited to the above embodiments. For example, the reference voltage applied to the comparator 13 may be set slightly higher than the charging value obtained by the charging setting time of the timer circuit 9, and the value may be determined according to the specifications.

Further, the reference voltage generating means and others may be determined according to the specifications thereof, and in short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional device, and FIG. 2 is a schematic block diagram showing an embodiment of the present invention. 1...Commercial power supply, 2...Diode Pritzno circuit,
3... Capacitor, 4... Oscillator, 5... Secondary battery, 9... Timer circuit, 13... Comparator, 14...
...Latch circuit, 15...OR circuit.

Claims (3)

[Claims] (1) A charging power supply for a device with a built-in secondary battery equipped with a charging circuit for a secondary battery. A comparator that compares it with a reference voltage and outputs a signal when the terminal voltage exceeds the reference voltage, a latch circuit that receives the output signal of this comparator and outputs a latch signal, and this latch circuit outputs A photoelectric control device for a device with a built-in secondary battery, characterized in that it comprises an OR circuit that inputs a latch signal or a time-up signal of the timer circuit to control the stopping of charging of the secondary battery by the charging circuit. (2) The secondary battery according to claim 1, wherein the predetermined elapsed time during which the timer circuit outputs the time-up signal is set as a time sufficient for the amount of photoelectricity of the secondary battery to reach a specified value. Charging control device for devices with built-in batteries. (3) The secondary battery according to claim 1, wherein the comparison reference voltage of the comparator is given as a voltage that enables the charging lid of the secondary battery controlled by the timer circuit to be fully charged. Photoelectric control device for built-in equipment.