JPH0429298B2 - - Google Patents

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to a power supply device for a battery-powered electric appliance such as an electric shaver, which includes a main battery and a sub-battery. [Background Art] Conventionally, in a power supply device for an electric appliance such as an electric shaver that has a main battery and a sub battery, as described in Japanese Utility Model Publication No. 58-25735, the power supply of the main battery is used from the main battery. Generally, the sub battery is used after the battery capacity is exhausted, but the structure is such that the user can switch from the main battery to the sub battery at will, depending on the remaining capacity of the main battery. , there was no way to control the use of secondary batteries. In other words, in the case of Utility Model Publication No. 58-25735, the auxiliary battery can be used regardless of the residual capacity of the main battery.
There was a risk that the benefits of secondary batteries would be lost. For example, if the battery capacity of the auxiliary battery is used up before the main battery, when the battery capacity of the main battery runs out, the battery capacity of this power supply unit runs out.
There was a problem in that electrical equipment using this power supply device could no longer be used. [Object of the Invention] The present invention has been provided in view of the above-mentioned points, and an object of the present invention is to provide a power supply device in which the battery capacity of the auxiliary battery, which is a spare battery, does not run out before the main battery. It is something to do. [Disclosure of the Invention] Examples of the present invention will be described in detail below with reference to the drawings. Figure 1 shows a specific circuit diagram, where T is a transformer that steps down the voltage of the AC power supply, and switch SW ₁ is connected to the secondary side via a rectifier diode D. . _EM is a main battery that is a rechargeable battery, and Es is a secondary battery that is a rechargeable storage battery. RS is a reed switch and M is a permanent magnet. Normally, reed switch RS is closed by the magnetic field of permanent magnet M. L
is a coil that is structurally placed facing the reed switch RS. When a current flows through the coil L, the magnetic field of the coil L cancels the magnetic field of the permanent magnet M, opening the reed switch RS.
The coil L is connected in series with the main battery _EM , the reed switch RS is connected in _series with the auxiliary battery _Es , and the load battery
It will be connected to the Es side. Note that R is resistance. The reed switch RS, permanent magnet M, coil L, etc. constitute a switching element. Here, when switch SW ₂ is turned off and switch SW ₁ is turned on to short-circuit terminals 1, 2, 3 and terminals 4, 5, and 6, the voltage is reduced by transformer T and rectified by diode D. Then, the main battery _EM and the auxiliary battery Es are respectively charged. Next, in FIG. 1, if the operation of shorting the terminals 8 and 9 and the terminals 11 and 12 is defined as "operation", the closed circuit in this state is as shown in FIG. 2. In this state, terminals 8 and 9 are short-circuited, so the main battery E _M is connected to the load X such as a motor, and the main battery E _M is connected to the load Only the voltage of battery E _M is applied. Note that the arrows in the figure indicate the flow of current from the main battery _EM . In Figure 1, terminals 7, 8, 9, 10, 1
If the operation of short-circuiting 2 and 13 is defined as an "operation", FIG. 3 shows a closed circuit in this state. In Figure 3, the closed circuit including the main battery E _M is
A current proportional to the battery capacity of the main battery _EM flows as shown by the arrow in the figure, and a magnetic field corresponding to the magnitude is induced by the coil L. In addition, the circuit including the sub-battery Es is normally connected to a reed switch by a permanent magnet M.
RS constitutes a closed circuit. Coil L facing the normally closed reed switch RS
If it creates a magnetic field, it will affect the magnetic field created by the permanent magnet. And the magnetic field caused by the coil L is the main battery E _M
In other words, the battery capacity of the main battery _EM controls the opening and closing of the reed switch RS.
Therefore, when the battery capacity of the main battery E _M is larger than a certain value, the magnetic field from the coil L and the magnetic field from the permanent magnet M cancel each other out, turning off the reed switch RS and causing a current to flow through the load X. Not flowing.
Furthermore, if the main battery _EM is smaller than a certain value, the reed switch RS will remain closed due to the magnetic field of the permanent magnet M, and current will flow from the auxiliary battery Es to the load X. This is the state shown in FIG. In other words, when the main battery E _M has battery capacity, the sub battery Es cannot be operated, and the sub battery E _S can only be used when the main battery E _M has no battery capacity. . In addition, the main battery _EM ,
The switching value of the sub battery E _S is the permanent magnet M and the coil L.
This can be easily changed by changing the positional relationship with the coil L or the number of turns of the coil L. The reason why the pilot lamp PL is provided in the circuit containing the main battery _EM is that when the main battery _EM still has battery capacity, when the sub battery Es is turned on,
As mentioned above, no voltage is applied to load X, but
If left in this state, the main battery _EM will discharge, so the user is warned not to leave it in this state.
This is to notify the presence or absence of the battery capacity of the main battery _M.
Therefore, the pilot lamp PL, which is a warning indicator light,
does not operate under normal usage conditions and there is no loss of power, i.e. the main battery EM. The above can be summarized as shown in Table 1 below.

【table】

〔Effect of the invention〕

As described above, the present invention provides a power supply device having a main battery and a sub-battery, and in which the main battery and the sub-battery are connected to a load by selectively switching between the main battery and the sub-battery. a switch means for forming a closed loop between the main battery and the warning indicator light and a closed loop between the auxiliary battery and the load through a second operation; The device is equipped with a switching element that interrupts the closed loop of the auxiliary battery to the load when the battery capacity is greater than a predetermined value, so if the main battery has a capacity, the switching element does not connect the load and the auxiliary battery. After the battery capacity of the main battery is exhausted, the secondary battery as a spare battery is consumed, so the battery capacity of the secondary battery does not run out first, and when the battery capacity of the main battery runs out, the secondary battery is used up. The battery can reliably drive the load continuously, and the second operation of the switch means forms a closed loop between the main battery and the warning indicator light, and a closed loop between the auxiliary battery and the load. If the battery has sufficient battery capacity, it is possible to display a warning that the load will be left without power being supplied to the user to notify the user of abnormal usage.Moreover, the warning indicator light is in a closed loop with the secondary battery. This prevents the secondary battery from depleting and allows the secondary battery to perform its original function by supplying power only to the load.Also, the warning indicator light is activated when the main battery has sufficient battery capacity to indicate an abnormality. The warning indicator lamp is used for notification only when the main battery is used for normal use, and the warning indicator light does not operate in normal use when power is supplied to the load from the main battery, resulting in no loss of power.

[Brief explanation of drawings]

FIG. 1 is a specific circuit diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram showing the same operation as above, FIG. 3 is a circuit diagram showing the same operation when the main battery has a battery capacity, and FIG. FIG. 4 is a circuit diagram showing a case where the main battery has no battery capacity. E _M is the main battery, E _S is the sub battery, X is the load, RS is the reed switch, and L is the coil.

Claims (1)

[Scope of Claims] 1. In a power supply device having a main battery and a sub-battery, and in which the main battery and the sub-battery are selectively switched and connected to a load, a first operation connects the main battery and the load. A switch means that forms a closed loop and forms a closed loop between the main battery and the warning indicator light and a closed loop between the auxiliary battery and the load by a second operation, and a switch means that detects the battery capacity of the main battery and determines the battery capacity of the main battery. A power supply device comprising: a switching element that interrupts the closed loop of the auxiliary battery to the load when the amount exceeds a predetermined value. 2. The switching element is characterized by comprising a coil provided in a closed loop of a main battery, which is a storage battery, and a reed switch, which is provided in a closed loop of a secondary battery, which is a storage battery, and is driven by the magnetic field of the coil. A power supply device according to claim 1.