JPH038039Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a small rechargeable electric device, particularly one that can charge a rechargeable battery and drive the device at the same time.

Conventionally, this type of small rechargeable electric device has been equipped with first, second and third fixed electrodes 23a, 2 in conjunction with the sliding operation of the power switch 22, as shown in FIG.
In most cases, the AC adapter 11 charges the rechargeable battery 6 and the motor 5 is energized at the same time by simultaneously connecting the movable electrodes 3b and 23c. In this case, if the rechargeable battery 6 has sufficient capacity remaining, the current flowing into the rechargeable battery 6 will be small and the current supplied to the motor 5 will be sufficient, so there is no problem, but if the rechargeable battery 6 is completely discharged. When the AC adapter 11 is running, the current supplied from the AC adapter 11 to the rechargeable battery 6 is large, and since the rechargeable battery 6 is a capacitive load, the motor 5 is an inductive load, so voltage is applied to both at the same time. In this case, current flows to the rechargeable battery 6 side earlier than to the motor 5 side. Furthermore, the torque of the motor 5 is many times greater during startup than during steady rotation, and therefore there is a risk that the current supplied to the motor 5, that is, the starting torque, will be insufficient and a startup error may occur.

The present invention has been developed focusing on the above problem, and as shown in the basic configuration in FIG.
It includes an inductive load 5 such as a motor to which power is selectively supplied from an adapter 11, and a power switch 9 that regulates the timing of energizing the load 5.

Further, the power switch 9 described above is configured with first and second switching means that are linked to the operation of the switch knob 15 and are turned on sequentially with a time difference, while the load 5 is configured with the first switching means,
The rechargeable battery 6 is connected in series with the second switching means, and each of the series connected devices is connected in parallel to the output side of the AC adapter 11, and the first switching means can be turned on before the second switching means. By doing so, it is an object of the present invention to provide a small rechargeable electric device that can supply sufficient power to the load 5 at the time of startup and prevents inconveniences such as startup errors.

The present invention will be specifically described below based on embodiments shown in the drawings.

Although the drawings show an example in which the present invention is applied to a rechargeable electric shaver, the present invention is of course not limited to this and can be applied to various types of rechargeable small electric appliances such as tape winders and electric hair clippers.

As shown in FIGS. 1 to 3, the electric shaver 1 embodying the present invention has a removable outer cutter 3 on the upper end of the main body case 2, and a removable outer cutter 3 that slides inwardly on the outer cutter 3, as in the conventional case. In addition to the inner blade 4, the main body case 2
Inside, there is a motor (load) 5 that reciprocates the inner cutter 4, and a rechargeable battery 6 that supplies power to the motor 5.
A power switch 9 provided on the front face 7 of the main body case 2 regulates the timing of energization from the rechargeable battery 6 to the motor 5.

A connecting means 10 such as a pin plug and a jack is provided on the bottom surface of the main body case 2, and an external AC
It is possible to charge the rechargeable battery 6 from the adapter 11 and energize the motor 5 at the same time.

The present invention is characterized by the procedure for applying voltage to the motor 5 and the rechargeable battery 6 when using the AC adapter 11. That is, when starting the motor 5, the starting torque of the motor 5 is large and the starting current is also required to be excessive compared to when the motor is rotating normally. By applying the output voltage from the AC adapter 11 to the rechargeable battery 6 when the rotation of the motor reaches a steady state and the current has settled down to a substantially constant value, the motor 5 can be prevented from starting incorrectly. It is intended to prevent

An example of the configuration of the power switch 9 that operates in this manner will be explained based on FIGS. 2 and 3.

The power switch 9 consists of a switch board 13 having a fixed electrode 12, and a slide knob 15 having a movable electrode 14 on its lower surface and sliding on the switch board 13. The fixed electrode 12 includes first and second fixed electrodes 12a and 12b arranged substantially in parallel;
The third electrode 12c extends perpendicularly to the two electrodes 12a and 12b, and has its tip 16 disposed close to the tip 17 of the second fixed electrode 12b.

On the other hand, the movable electrode 14 is approximately H-shaped, and has first to fourth contacts 19a, 19b, respectively, on the lower surface of each end.
19c and 19d are provided. Here, the distance between the third and fourth contacts 19c and 19d is the second electrode 12b.
is approximately equal to the distance between both tips 17, 16 of the third electrode 12c, and the distance between the first and third contacts 19a, 19
The distance between the first and second fixed electrodes 12a, 12
It is set slightly longer than the distance between b.

In addition, the switch board 13 in the portion where the fixed electrode 12 is disposed is provided with appropriate irregularities as shown in FIG.
Slide operation is possible with a sense of moderation.

In this configuration, when the power plug 20 of the AC adapter 11 is inserted into an outlet, as shown in FIG. A charging current of a predetermined value is supplied.

Here, when the slide knob 15 is slid one step, the first and second contacts 19a, 19b of the movable electrode 14 are first connected to the first fixed electrode 12, as shown in FIG. 4a.
contact a. At this time, the fourth contact point 19d is in contact with the third fixed electrode 12c, so the voltage output from the AC adapter 11 is
From the fixed electrode 12c to the fourth contact 19 of the movable electrode 14
d and the first fixed electrode 1 via the second contact 19b.
2a, voltage is directly applied to the motor 5.
At this time, current is also supplied to the rechargeable battery 6, but this current is regulated to a sufficiently low level by the resistor 21, so the power required to start the motor 5 is AC
Sufficient power is supplied from the adapter 11, so that the motor 5 starts stably.

When the slide knob 15 is further slid, the third contact 19c comes into contact with the second fixed electrode 12b as shown in FIG. A larger current is supplied than before. At this time, the motor 5 is already within a stable operating range, the power consumption of the motor 5 is small, and the supply of charging current to the rechargeable battery 6 has no adverse effect on the operation of the motor 5.

When the AC adapter 11 is not used, power is supplied from the rechargeable battery 6 to the motor 5 by sliding the slide knob 15 all at once as shown in FIG.

Note that the power switch 9 is not limited to a slide type, but may be a push button type. In this case, by providing two sets of switches that turn on in conjunction with the push operation, and by slightly shifting the on timings of both switches, the same operation as described above becomes possible.

Further, although the AC adapter 11 is formed separately from the main body of the device, it may be built into the main body case 2 and only the power cord can be attached or detached.

As described above, the present invention is a small electric device that switches between two power sources, the rechargeable battery 6 and the AC adapter 11, and also charges the rechargeable battery 6 at the same time when the AC adapter 11 is used.
When turning on the power switch 9, the output voltage of the AC adapter 11 is first applied to the inductive load 5 such as a motor, the load 5 is started and operated stably, and then the rechargeable battery 6 is energized. This has the advantage that the inductive load 5 can be prevented from malfunctioning during starting, such as a starting error in the motor.

[Brief explanation of drawings]

Fig. 1 is a front view of an electric shaver showing an example of implementing the present invention, Fig. 2 is an electric circuit diagram, Fig. 3 is an enlarged sectional view of the power switch, and Figs. 4 a and b show the switching status of the power switch. Explanatory diagram shown in Figure 5a
1 to 3 are explanatory diagrams showing the operating status of the electric circuit, and FIG. 6 is an explanatory diagram showing the operation when a rechargeable battery is used as a power source. FIG. 7 is an electrical circuit diagram showing a conventional example. FIG. 8 is an explanatory diagram showing the basic configuration of the present invention. 2... Main body case, 5... Motor (load), 6
... Rechargeable battery, 9 ... Power switch, 10 ... Connection means, 11 ... AC adapter, 15 ... Slide knob.

Claims (1)

[Scope of claim for utility model registration] Rechargeable battery 6, AC adapter 11, and the aforementioned rechargeable battery 6 or AC adapter 11
an inductive load 5 selectively powered by
and a power switch 9 that regulates the timing of energization to the load 5, and when the AC adapter 11 is selected as the power source for driving the load, the drive current is supplied to the load 5 and the rechargeable battery 6 is switched on.
It is a small electric device that supplies charging current to the
The load 5 is composed of the first switching means and the rechargeable battery 6, which are connected to the operation of the first switching means and the second switching means, which are turned on sequentially with a time difference.
are connected in series with the second switching means, and each of the series connected units is connected to the AC adapter 1.
A small rechargeable electric device, characterized in that the first switching means is connected in parallel to the output side of the second switching means, and the first switching means can be turned on before the second switching means. The small electric device according to claim 1, wherein the inductive load 5 is a motor.