JPH0317570Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a rechargeable electric appliance such as a rechargeable electric shaver that is charged by a transformer charging circuit and equipped with two storage batteries with different charging capacities. .

[Conventional technology]

For example, when using an electric razor, if the voltage of the storage battery drops below a certain level (the battery runs out), it becomes difficult to use and the user is forced to charge it midway through shaving. Some devices are equipped with another small-capacity storage battery so that when the battery runs out, this can be switched over for continued use.

A conventional example of achieving this is shown in FIG. In the figure, 1 is a transformer, and a series circuit of a diode 2 and a main storage battery 3 is connected between both ends of its secondary winding. The negative electrode of the main storage battery 3 is connected to the positive electrode of an auxiliary storage battery 4 whose capacity is smaller than that of the main storage battery 3.
It is connected via a limiting resistor 5 and a diode 6 to one end of a secondary winding of a transformer 1 to which the anode of the diode 2 is connected. A diode 6 is provided with its cathode connected to the secondary winding of the transformer 1. A series circuit consisting of a main switch 8 and a load 9 such as a motor is connected via a changeover switch 7 to the battery circuit formed by connecting different polarities as described above. The changeover switch 7 has fixed terminals 10 and 11 and a common terminal 1.
2 and a first switch section having a fixed terminal 1.
3 and 14 and a second switch section having a common terminal 15. The fixed terminals 11 and 13 of this switch 7 are connected to both the storage batteries 3 and 4.
The open pole of the main storage battery 3 is connected to the fixed terminal 10, the open pole of the auxiliary storage battery 4 is connected to the fixed terminal 14, and the common terminals 12 and 15 are connected to mutually connected poles of different polarities. It is connected to a series circuit of main switch 8 and load 9.

In this conventional technology, the changeover switch 7 normally has a fixed terminal 10 and a fixed terminal 1 as shown in FIG.
2, and also connects the fixed terminal 13 and the common terminal 15. Therefore, by closing the main switch 8, the power from the main storage battery 3 can be applied to the load 9, and if the main storage battery 3 runs out during use, the changeover switch 7 can be switched to connect the fixed terminal 11 and While connecting the common terminal 12, the fixed terminal 14 and the common terminal 1
5, the power of the auxiliary storage battery 4 can be applied to the load 9 for continued use. Also, during charging, the current half-wave rectified by the diode 2 is sent to the main storage battery 3 every half-cycle period of AC.
can be charged through the main storage battery 3, and the diode 6 can be charged every other half cycle period of AC.
The half-wave rectified current is passed through the auxiliary storage battery 4, and the auxiliary storage battery 4 can be charged with a charging current smaller than the charging current for the main storage battery 3 through the limiting resistor 5.

[Problem that the invention attempts to solve]

However, in this prior art, since both storage batteries 3 and 4 are provided with different poles connected to each other, a dual type changeover switch 7 is required to switch between both storage batteries 3 and 4 with respect to a load 9. Therefore, since two switch parts are required, the structure is complicated and the cost is high, and the defective rate is also high.Furthermore, due to the contact resistance between the two switch parts, There is also the problem of increased energy loss.

Furthermore, since the charging current flowing to both storage batteries 3 and 4 is obtained by half-wave rectification, the capacity of the transformer 1 is such that the current sufficient to charge the main storage battery 3 can be obtained by half-wave rectification. Although it is necessary,
In this case, the charging current for the auxiliary storage battery 4 is too large, so the magnitude of the current is limited by the limiting resistor 5. Therefore, there is a problem that the capacity of the transformer 1 becomes larger than the sum of the charging currents for the storage batteries 3 and 4.

[Means for solving problems]

In order to solve the above problems, the present invention connects the same poles of one of two storage batteries charged by a transformer type charging circuit, and connects the two batteries of the transformer whose primary winding is connected to the commercial AC power supply. Next winding and above 2
One of the two storage batteries is connected through a full-wave rectifier circuit, and the other of the two storage batteries is connected to the secondary winding of the transformer through a half-wave rectifier circuit. and between the interconnection electrode of both of the storage batteries and the open electrode of one of the storage batteries,
A load to which electric power is applied from one of the storage batteries is connected through one contact of the changeover switch, and a connection terminal of the changeover switch is connected between the interconnection pole of both storage batteries and the open pole of the other storage battery. The load to which power from the other storage battery is applied is connected through the other contact.

[Effect]

According to this rechargeable electric appliance, one of the two storage batteries is connected with the same poles, and these storage batteries are connected to the transformer via a full-wave rectifier circuit and a half-wave rectifier circuit, so that the transformer is not activated during charging. The power supply voltage stepped down can be charged to one storage battery during both AC half cycles (full cycle), and can be charged to the other storage battery during an AC half cycle. According to the transformer-type charging circuit described above, the switch section can use one changeover switch, and by switching this switch, one of the storage batteries can be selected and the electric power can be applied to the load. Can be applied and used. Therefore, even if one of the storage batteries runs out, work such as shaving can be continued using the power from the other storage battery. Furthermore, according to the transformer-type charging circuit described above, since the conventionally used limiting resistor can be omitted, the sum of charging currents for both storage batteries and the capacity of the transformer can be made the same. The capacity of the transformer can be reduced.

〔Example〕

FIG. 1 shows a first embodiment of the invention. In FIG. 1, 21 is a step-down transformer, the primary winding of which is connected to a commercial AC power source 22. Further, 23 and 24 are two storage batteries having different capacities and forming a battery circuit, and these are provided with one of the same poles (for example, negative poles) connected together. One of these two storage batteries, 23 having a large capacity, is connected to the secondary winding of the transformer 21 via a full-wave rectifier circuit 25. The full-wave rectifier circuit of this embodiment has four diodes 26, 27,
It is formed by combining 28 and 29 into a bridge.
Furthermore, the other small capacity storage battery 24 is connected to the secondary winding of the transformer 21 via a half-half wave rectifier circuit 30. The half-wave rectifier circuit 30 includes a diode 31
It is formed with In addition, the above transformer 2
1. The full-wave rectifier circuit 25 and the half-wave rectifier circuit 30 constitute a transformer-type charging circuit. The inner blade of the electric shaver is operated via one contact 33 of the changeover switch 32 between the interconnected electrodes of both storage batteries 23 and 24 and the open electrode which is the positive electrode of one storage battery 23. A load 34 such as a motor is connected. Along with this, both storage batteries 23, 2
A changeover switch 32 is connected between the interconnection pole of No. 4 and the open pole, which is the positive pole of the other storage battery 24.
A load 34 is connected via the other contact 35 of the . The changeover switch 32 has a fixed terminal 36,
37 and a common terminal 38, the contact 33 is formed by a fixed terminal 36 and a common terminal 38, and the other contact 35 is formed by a fixed terminal 37 and a common terminal 38. Note that 39 in FIG. 1 is a main switch inserted in series on the positive or negative side of the load 34.

In this rechargeable electric appliance, storage batteries 23, 2
When the main switch 39 is closed when the changeover switch 32 closes the contact 35 as shown in FIG. 1 while all of the batteries 4 are charged, the power of the storage battery 23 with a large capacity is applied to the load 34 and the shaving is performed. can be done. Even if the storage battery 23 runs out during use, the contact 35 of the changeover switch 32 is closed so that the power from the storage battery 24 with a small capacity is transferred to the load 34.
can be used continuously.

In addition, when charging the storage batteries 23 and 24, the diode 2 of the secondary winding of the transformer 21
9 side positive at one end, and diodes 26, 31
During the AC half-cycle period when negative induced power is generated at the other end of the side, the current flows through the diode 27,
The storage battery 23 is charged by passing through the storage battery 23 and the diode 29 in this order. During the other half-cycle period of the alternating current, in which negative induced power is generated at one end on the diode 29 side of the secondary winding of the transformer 21 and positive induced power is generated on the other end on the diode 36, 31 side, the current flows through the diode 26, Storage battery 23,
The storage battery 23 is connected to the storage battery 23 by passing through the diode 29 in this order.
In addition to charging the diode 31, the storage battery 2
4. Charge the storage battery 24 by passing through the diodes 29 in the order listed. That is, the storage battery 24 is charged during each AC half cycle period, and the storage battery 23 is charged during both AC half cycle periods. For this reason,
Assuming there is no forward voltage drop across each diode,
Using the same transformer, the storage battery 23 is connected to the storage battery 2
It can be charged by flowing 1.5 times the charging current of 4. In addition,
In reality, it will be about 1.3 to 1.4 times due to the regulation of the transformer or the rise in battery voltage. Therefore, the capacity of the transformer required to obtain the same charging current is smaller than that of the transformer used in the conventional structure shown in FIG.

FIG. 2 shows a second embodiment of the invention. In this embodiment, a center-tapped transformer is used as the transformer 21, and a full-wave rectifier circuit 25 is used.
is formed by two diodes 40 and 41 whose anodes are connected to both ends of a transformer 21, respectively.
The structure is the same as that of the first embodiment, except that the cathodes of the anodes 40 and 41 are connected to each other, and this connection point is connected to the positive electrode of the storage battery 23.

In this embodiment, during the AC half-cycle period in which positive induced power is generated at the diode 41 side end of the secondary winding of the transformer 21, current flows from the diode 41 through the storage battery 23 to the center tap of the secondary winding. flows, and the storage battery 23 is charged. A diode 31 of the secondary winding of the transformer 21,
During the other half-cycle period of the alternating current, where a positive induced power is generated at the end of the 40 side, the current flows across the diode 4
0 to the storage battery 23, passes through the diode 31 to the storage battery 24, and from the storage batteries 23 and 24 both flows to the center tap, so that the storage batteries 23 and 24 are charged at the same time.

Therefore, this configuration can also solve the conventional problems as in the first embodiment.

FIG. 3 shows a third embodiment of the present invention. The full-wave rectifier circuit 25 of this embodiment has the anode of a diode 42 connected to one end of the secondary winding of the transformer 21, and the cathode of a diode 43, and a diode 44 connected to the other end of the secondary winding. The anode of the diode 45 is connected, and the cathode of the diode 45 is connected.
The anodes of the diodes 42 and 44 are connected together, and this connection point is connected to the interconnection end of the storage batteries 23 and 24, and the cathodes of the diodes 42 and 44 are connected together, and this connection point is connected to the positive electrode of the storage battery 23. There is. Further, the half-wave rectifier circuit 30 is a full-wave rectifier circuit 25.
43 and a diode 31. The configuration other than these is the same as the first embodiment.

In this embodiment, every half-cycle period of alternating current in which a positive induced voltage is generated at the ends of the secondary winding of the transformer 21 on the side of the diodes 42 and 43, the current flows through the diode 42, the storage battery 23, and the diode 45 as described above. The storage battery 23 is charged in this order. Also,
Diodes 44 and 45 of the secondary winding of the transformer 21
During the other half-cycle of the alternating current, where a positive induced voltage is generated at the side end, the current flows through the diode 44,
The storage battery 23 is charged by passing through the storage battery 23 and the diode 43 in this order, and the storage battery 24 is charged by passing through the diode 31, the storage battery 24, and the diode 43 in this order.

Therefore, in this embodiment as well, the conventional problems can be solved as in the first embodiment.

FIG. 4 shows a fourth embodiment of the present invention. In this embodiment, storage batteries 23 and 24 are connected at their positive terminals, and diodes 42, 43, 4 included in a full-wave rectifier circuit 25 and a half-wave rectifier circuit 30 are connected.
4, 45, and 31 are all connected in opposite directions to those of the third embodiment, and the polarity of the load is also reversed. Also in this configuration, the problems of the conventional device can be solved by the same operation as in the third embodiment.

In each of the above embodiments, a rechargeable electric shaver includes a transformer, each storage battery, each rectifier circuit, a changeover switch,
This is a case in which a rechargeable electric shaver with a load is installed, but is not limited to this.Each storage battery, a changeover switch, and a load are installed in the main case, and a charger that is detachably connected to the main case is used. It can also be applied to rechargeable electric shavers equipped with rectifier circuits and transformers. Further, the present invention is not limited to a rechargeable electric shaver, but can be implemented with any rechargeable electric appliance equipped with two storage batteries. Furthermore, in the present invention, each rectifier circuit is not limited to a combination of diodes, and may be constructed of other circuit elements. Moreover, the present invention may be implemented by reversing the polarities of each storage battery, each diode, and the load in the first embodiment. Further, the present invention may be implemented by adding a resistor for fine current adjustment to the transformer charging circuit.
In addition, when implementing the present invention, the load, each storage battery, full-wave rectifier circuit,
It goes without saying that the specific structure, shape, position, etc. of the half-wave rectifier circuit, transformer, changeover switch, etc. are not limited to the above embodiments, and can be implemented in various configurations.

[Effect of idea]

The present invention, which has the gist of the configuration described in the claims for utility model registration, is capable of charging one of two storage batteries, one of which has the same poles connected, every half cycle of AC using a full-wave rectifier circuit. Since both of the two storage batteries can be charged during the other half cycle period of AC using the full-wave rectifier circuit and the half-wave rectifier circuit, a single changeover switch can be used and the conventional limiting resistor can be omitted. can. For this reason, the structure of the changeover switch is simpler than before, which helps reduce costs, reduces energy loss due to poor contact and contact resistance caused by the changeover switch, and allows the use of a small-capacity transformer. Can be done.

[Brief explanation of drawings]

FIG. 1 is an electrical circuit diagram of a rechargeable electric shaver according to a first embodiment of the present invention. FIG. 2 is an electrical circuit diagram of a rechargeable electric shaver according to a second embodiment of the present invention. FIG. 3 is an electrical circuit diagram of a rechargeable electric shaver according to a third embodiment of the present invention. FIG. 4 is an electrical circuit diagram of a rechargeable electric shaver according to a fourth embodiment of the present invention. FIG. 5 is an electrical circuit diagram showing an example of the conventional system. 21...Transformer, 22...Commercial AC power supply, 2
3, 24...Storage battery, 25...Full wave rectifier circuit, 3
0...half-wave rectifier circuit, 32...changeover switch, 33, 35...contact, 34...load.

Claims (1)

[Scope of utility model registration request] In a rechargeable electrical appliance equipped with two accumulators charged by a transformer-type charging circuit and a load to which power from these accumulators is selectively applied, connecting the same poles of one of the two accumulators together. The secondary winding of the transformer, whose primary winding is connected to a commercial AC power source, and one of the two storage batteries are connected via a full-wave rectifier circuit, and the The other storage battery and the secondary winding of the transformer are connected through a half-wave rectifier circuit, and a changeover switch is connected between the mutual connection terminal of both storage batteries and the open terminal of one of the storage batteries. The load is connected through one contact of the switch, and the load is connected between the mutually connected pole of both storage batteries and the open pole of the other storage battery through the other contact of the changeover switch. A rechargeable appliance featuring: