JPS5825735Y2 - charging circuit - Google Patents

Description

[Detailed description of the invention] The present invention is based on a switch 3 that can freely switch between a main storage battery 1 charged by a commercial power source 4 and an auxiliary storage battery 2 charged by a commercial power source 4 and having a smaller capacity than the main storage battery 1. load through 5
The charging circuit is connected to the auxiliary storage battery 20) and is equipped with a light-emitting element such as a pilot lamp 6' that lights up when the device is in use. It is possible to use the device continuously with the auxiliary storage battery by flipping a switch when the battery is exhausted, and even if the auxiliary storage battery is built in, the device does not have to be very large, and it is possible to notify the user of the need for charging. To provide a charging circuit capable of recovering both a main storage battery and an auxiliary storage battery when the charging circuit is connected to a commercial power source.

Generally, devices that use storage batteries, such as rechargeable electric shavers, are used by charging the storage battery, but the discharge characteristics of the commonly used nickel-cadmium batteries are such that the battery voltage remains low until the battery capacity is used up. fluctuation is small, and the battery voltage suddenly drops at the end of discharge.
For example, while shaving with a rechargeable razor, the device suddenly stops, making it impossible to shave the rest of the hair, which is very inconvenient to use.

As shown in Fig. 2, in the charging circuit of a conventional device using a storage battery such as a rechargeable electric shaver, only the main storage battery 1 is connected to the secondary side of the power transformer 7, and when the main storage battery 1 is exhausted, the load is actually reduced. It had the disadvantage that it could not be used and could only be used continuously under a load of 5.

To solve this drawback of the conventional example, for example, a rechargeable battery, a spare dry battery, and a switch to selectively switch between both batteries are provided, and when the rechargeable battery is unusable, the dry battery can be switched. However, in such a charging circuit, if you charge the dry cell battery without returning the selector switch after use, the dry cell battery will be charged, causing fluid leakage and heat generation. Also, if charging current accidentally flows to the dry cell side like this, even though the prescribed charging time has passed, the main storage battery side will not be charged at all by 4X. This has the disadvantage that situations such as this can occur.

The present invention has been devised in view of the above-mentioned points, and will be explained in detail below with reference to the drawings of the embodiments.

In FIG. 1, 1 is a main storage battery connected to the secondary side of a power transformer 7 via a rectifier diode 8.

An auxiliary storage battery 2 has a smaller storage capacity than the main storage battery 1, and is connected to the secondary side of the power transformer 7 via a rectifier diode 9 and a resistor 10.

Furthermore, the main storage battery 1 and the auxiliary storage battery 2 each have a changeover switch 3.
is connected to a load 5 such as a motor.

6 connects the common contact 11 of the switch 3 to the second one on the auxiliary storage battery 2 side.
This is a pilot lamp that electrically connects to the auxiliary battery 2 when it is turned over to the contact point 12.

However, when the commercial power supply 4 is connected to the primary side of the power transformer 7, the commercial voltage is applied to each storage battery 1 by the transformer 7.
. be.

When driving the load 5, the commercial power source 4 is disconnected from the power transformer 7, the common contact 11 of the switch 3 is turned to the first contact 14 side, and the load 5 is driven only by the main storage battery 1.

When the battery voltage of the main storage battery 1 gradually decreases, the common contact 11 of the switch 3 is connected to the second contact 1 of the auxiliary storage battery 21111.
2, the load 5 will be driven by the auxiliary storage battery 2.

At this time, the common terminal 11 comes into contact with the third contact 13 connected to the pilot lamp 6, so the pilot lamp 6 is turned on by the auxiliary storage battery 2, informing the user of the device that the auxiliary storage battery 2 is in use, and the main storage battery 1. This is a notification that the battery needs to be charged.

In this embodiment, the pilot lamp 6 is used as the light emitting element, or if the power consumption of the pilot lamp 6 is large, a light emitting element with low power consumption such as a light emitting diode may be used.

As described above, in this invention, the main storage battery and the auxiliary storage battery, which are charged by a commercial power source, are connected to the load via mutually switchable switches. By switching the auxiliary storage battery to the load, it is possible to use the equipment continuously, and the equipment will not suddenly stop driving while the equipment is in use, which has the effect of improving the usability of the equipment that uses the storage battery. Moreover, since the storage capacity of the auxiliary storage battery has been reduced, it can be made smaller, and the device does not have to be as large as before, even though it has a built-in auxiliary storage battery.

Furthermore, since the device is equipped with a light-emitting element such as a pilot lamp that lights up when the auxiliary storage battery is in use, it has the effect of notifying the user of the device whether or not charging is necessary, depending on the light-emitting state of the light-emitting element.

In addition, in this invention, a rechargeable storage battery is used as an auxiliary small capacity battery that is switched and connected in place of the main storage battery when it is used up, so when a dry cell battery is used as an auxiliary battery, In comparison, there is no possibility that a charging current might accidentally flow to a battery that cannot be recharged, so there is no room for leakage or heat generation, and the safety of the charging circuit is dramatically improved. Furthermore, in this invention, the auxiliary storage battery is charged together with the main storage battery by the commercial power supply, so when the charging circuit is connected to the commercial power supply, the main storage battery and the auxiliary storage battery are always recovered at the same time. ), which has the effect that the backup function of the auxiliary storage battery will not be lost under any circumstances.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of the present invention-Fu embodiment, and Fig. 2 is a conventional electric circuit diagram of the same as above. The load 6 is a pilot lamp.

Claims (1)

[Scope of utility model registration request] A main storage battery that is charged by a commercial power source and an auxiliary storage battery that is charged by a commercial power source and has a smaller capacity than the main storage battery are connected to the load via mutually switchable switches, and the lights are turned on when the auxiliary storage battery is in use. A charging circuit equipped with a light-emitting element like a pilot lamp.