JPS5833776B2 - charging device - Google Patents

Description

[Detailed description of the invention] The present invention relates to a charging device.

FIGS. 1, 2, and 3 show a perspective view, a schematic configuration diagram, and an electric circuit diagram of a conventional charging device of this type used for an electric shaver.

In such a conventional example, when the lower part of the device body 3 is fitted and attached to the device mounting portion 2, which is a concave surface provided on the charger body 1 having a substantially U-shaped cross section, the primary winding built into the charger body 1 is A primary iron core 5 around which a wire 4 is wound, and a secondary winding 6 built into the device body 3
A closed magnetic circuit is formed with the secondary iron core 7, which is wound with D
The rectified voltage is then rectified to charge the battery 8 to be charged.

However, when the device main body 3 is removed from the charger main body 1 with AC power connected, the magnetic path of the primary iron core 5 is opened.
There has been a problem in that the inductance of the primary winding 4 is extremely reduced, the no-load current flowing through the primary winding 4 is increased, and the temperature of the primary winding 4 is increased.

Therefore, in conventional charging devices of this type, the no-load impedance must be set high and the transformer must be designed to suppress the primary current flowing through the primary winding 4 during no-load conditions, resulting in low output. I had no choice but to use it as a charging device.

Note that the symbol in the figure is the load, and S is the operation switch.

The present invention has been made in view of the above-mentioned problems, and its purpose is to prevent the no-load iron core from forming when the device main body is removed from the charger main body, suppress temperature rise, To provide a charging device that displays a no-load state by vibrating a no-load iron core and a coil spring body that urges the no-load iron core upward.

The present invention will be explained below using an example.

FIG. 4 shows a perspective view of a charger main body 1 having a substantially U-shaped cross section according to one embodiment.

The charger main body 1 has a recessed surface with openings at both ends and the top surface provided in the central upper surface part to constitute a chamber-shaped device mounting part 2, and inside there is a primary iron core made of a substantially U-shaped iron core. 5 is arranged.

The primary iron core 5 has both side pieces arranged along both rising surfaces of the device mounting portion 2, and the primary winding 4 for connection to an AC power source is wound around the central piece.

On the other hand, the device mounting section 2 has a coil spring body 9 disposed at the center of the bottom, and a bottom plate 10 made of synthetic resin or the like is attached to the upper end of this coil spring body 9, so that the bottom plate 10 is always kept pointing upward. It is lifted horizontally.

The bottom plate 10 has a plate-shaped no-load iron core 11 embedded therein, and as shown in FIG. 4 or FIG. 5 and the no-load iron core 11 constitute a closed magnetic path.

However, in the no-load state shown in FIG. 5, the closed magnetic circuit between the primary iron core 5 and the no-load iron core 11 prevents a decrease in inductance during no-load and controls the increase in no-load current. It is possible.

When charging now, the bottom plate 10 in the state shown in FIG. When the secondary iron core 7 placed horizontally in the center of the device main body 3 is magnetically coupled with the primary iron core 5, a closed magnetic path is formed as shown in FIG. The secondary winding 4 and the secondary winding 6 constitute a re-cage transformer, and the battery 8 to be charged in the main body 3 of the device can be charged as in the conventional case.

When charging is completed and the main body 3 of the device is removed, the bottom plate 10 returns to the state shown in FIG. 5.

In addition, the natural frequency formed by the bottom plate 10 including the no-load iron core 11 and the coil spring body 9 is set near the AC power frequency, so that when no load is applied, the no-load iron core 11
The bottom plate 10 including 1 vibrates based on the power supply frequency and generates a vibration sound, and a buzzer sound indicating that there is no load is generated.

FIG. 7 shows a perspective view of another embodiment of the present invention, in which a plate-shaped no-load iron core 11 that also serves as a bottom plate is directly pushed upward by a coil spring 9, and The natural frequency of the vibration system of the coil spring 9 and the iron core 11 for no-load use is set near the frequency of the AC power supply, and the closed magnetic circuit formed during no-load operation as shown in Figure 8 allows for no-load use. The iron core 11 vibrates based on the power supply frequency and generates a vibration sound, and a buzzer sound is generated to indicate that there is no load.

Incidentally, when the load is applied as shown in FIG. 9, the operation is similar to that of the embodiment shown in FIG.

As described above, the present invention provides a plate-shaped no-load device that forms a closed magnetic path with the primary iron core when the device main body is not attached to the vertically formed device mounting portion of the charger main body to which the device main body is attached. The iron core is arranged to be movable up and down, and a coil spring body is arranged between the bottom of the device mounting part and the no-load iron core to bias the no-load iron core upward. Even when the main body is removed and there is no load, the no-load iron core is energized by the coil spring body and returns to its original state, and the primary iron core and no-load iron core form a closed magnetic path. The inductance of the primary winding does not decrease, and the primary no-load current can be kept low. As a result, temperature rise is prevented and extremely safe.

Furthermore, since the natural frequency formed by the no-load iron core and the coil spring body is set to the AC power frequency, the no-load iron core vibrates based on the power supply frequency due to the closed magnetic path formed during no-load. It can be made to emit a vibration sound and a buzzer sound to indicate that there is no load.
Therefore, even if the main body of the device falls down for some reason, the user can be notified of the no-load state.

[Brief explanation of drawings]

Figure 1 is a perspective view of the conventional example, Figure 2 is a schematic configuration diagram of the same as above,
Fig. 3 is an electric circuit diagram of the same as above, Fig. 4 is a perspective view of the charger body of the present invention when no load is applied, Fig. 5 is a schematic configuration diagram of the above when no load is applied, and Fig. 6 is an illustration of the same when under load as above. FIG. 7 is a perspective view of another embodiment of the present invention, FIG. 8 is a schematic diagram of the same under no load, and FIG. 9 is a schematic diagram of the same under load. 1 is the charger body, 2 is the device mounting part, 3 is the device body, 4 is the primary winding, 5 is the primary iron core, 6 is the secondary winding, 7 is the secondary iron core, 8 is for being charged The battery, 9 is a coil spring body, and 11 is an iron core for no-load use.

Claims (1)

[Claims] 1 The charger body has a built-in primary iron core wound with a primary winding connected to an AC power source, and a secondary winding is wound around the battery to be charged and a secondary winding that rectifies and supplies the output to the battery to be charged. Can be turned 2
A charging device in which a device main body containing a secondary iron core is removably attached, and the primary iron core and the secondary iron core are magnetically coupled to form a transformer, in which the device main body is attached. A plate-shaped no-load iron core, which forms a closed magnetic circuit with the primary iron core when the device body is not installed, is placed in the device mounting portion formed in the shape of a chamber hole in the main body so as to be movable up and down. A coil spring body that biases the no-load iron core upward is arranged between the bottom part and the no-load iron core, and the natural frequency formed by the no-load iron core and the coil spring body is controlled by an AC power source. A charging device that is characterized by setting a certain frequency.