JPH0697819B2 - Battery-Operation control device for built-in equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to an operation control device for a battery-equipped device that is capable of operating a load by means of a battery.

(Prior Art) In this type of equipment, a DC adapter that rectifies a commercial power source and supplies DC power is connected to or built in for charging a battery. The DC voltage of is regulated by a charging circuit having a constant voltage circuit to prevent overcharging of the battery. In addition, in this type of equipment, it is common to use such a DC adapter so that the load can be directly operated.Therefore, in order to protect the load from fluctuations in the voltage of the commercial power source, the DC adapter can be used. A constant voltage circuit that stabilizes the DC voltage is separately provided.
Here, FIG. 3 shows an example of a conventional configuration for concrete explanation. Reference numerals 1 and 2 denote a DC power source bus to which DC power is supplied from a DC adapter (not shown), and 3 denotes a charging voltage to the battery 4. A charging circuit for making a constant voltage, 5 is a DC motor as a load, and 6 is a constant voltage circuit for stabilizing a voltage applied to the DC motor 5 from a DC power bus. And
In order to select three operation modes of charging the battery 4, operation by the battery 4 and operation by the DC adapter, a three-circuit type changeover switch 7 is provided, and when the contacts a ₁ and b ₁ are closed, the battery 4 is charged through the charging circuit 3, the DC motor 5 is operated by the battery 4 when the contacts a ₂ and b ₂ are closed, and the DC adapter is driven by the DC adapter when the contacts a ₃ and b ₃ are closed. The motor 5 is designed to be operated.

(Problems to be Solved by the Invention) However, in the above-mentioned configuration, the changeover switch 7 needs to have three changeover positions, which is not only expensive, but also requires the user to use the battery in the same operation mode. The operation mode and the operation mode using the DC adapter have to be switched separately for each operation, and there is a drawback that the operation is troublesome.

Therefore, an object of the present invention is to provide an operation control device for a device with a built-in battery, which does not require the user to operate by distinguishing the operation mode, and can also reduce the manufacturing cost by reducing the number of operation positions of the changeover switch. To provide.

[Configuration of the Invention] (Means for Solving Problems) An operation control device for a battery-equipped device according to the present invention includes a charging circuit including a constant voltage circuit for converting a charging voltage of a battery to a constant voltage, The first and second contact groups are provided so as to be switchable between an operating position and a charging position, and the load is connected to the battery through the first contact group in the operating position by connecting switching elements in series. And a switch for connecting a load to the charging circuit via the second contact group and connecting the battery to the charging circuit via the first contact group at the charging position, and the DC power bus. And a switching control circuit for turning off the switching element when no voltage is applied and for turning on the switching element when no voltage is applied. Is shall.

(Operation) According to the above means, the changeover switch may be one that can be switched between the two positions of the operating position and the charging position, and the one having three operating positions as in the conventional case is not required. Even with such a configuration, the switching element connected in series with the load is turned off by the switching control circuit when a voltage is applied to the DC power supply bus and turned on when no voltage is applied. And the operation of the load by the DC power from the DC power bus can be automatically switched. Moreover, since the load is connected to the charging circuit via the second contact group of the changeover switch, the voltage is applied to the DC power supply bus to turn off the switching element, and the DC power from the DC power supply bus is applied. When the load is operated, the voltage applied to the load can be made constant by using the constant voltage circuit of the charging circuit, and it is not necessary to provide a separate constant voltage circuit.

(Embodiment) An embodiment in which the present invention is applied to, for example, a fan with a built-in battery will be described with reference to FIGS. 1 and 2. First, what is shown in FIG. 2 is a DC adapter,
This is connected to the commercial power supply 11 via an indoor outlet,
Output line L ⁺ , L that outputs a DC voltage with a configuration in which the voltage is reduced by the transformer 12 and rectified by the diode bridge 13.
^- can be connected to the DC power supply bus of fan main body (not shown).

On the other hand, the electric configuration of the fan main body is shown in FIG. 1, in which 14 and 15 are DC power supply bus lines to which the output lines L ⁺ and L ^{− of the} DC adapter are connected, 16 is a charging circuit, and 17 is a charging circuit.
Is a battery built into the fan body, and 18 is a changeover switch for changing the operation mode of the fan. This change-over switch 18 can be switched between the "operating position" and the "charging position" by a manual operation, and is provided with first and second contact groups 18a and 18b which are interlocked with each other in accordance with the changeover operation, and the "operating position" When operated to the “position”, as shown by the solid line in the figure, the first
The contacts a ₁ and c ₁ of the contact group 18a are closed, and the contacts a ₂ and c _{2 of} the second contact group 18b are closed, as indicated by the broken line when switched to the “charging position”. contact b _2, c of the second contact group 18b with the contacts b _1, c ₁ of the first contact group 18a is closed to the
_The space between the _two is closed. The positive side of the battery 17 is connected to the contact c ₁ of the changeover switch 18, and the negative side is connected to the negative DC power supply bus 15.

On the other hand, the charging circuit 16 will be described in detail below.
A transistor 19 in the form of a collector, the collector of which is connected to the positive DC power supply bus 14 and the emitter of which is connected via the diode 20 to the contacts c ₂ and b ₁ of the changeover switch 18. Further, a resistor 21 is connected between the collector and the base of the transistor 19, and the base is connected to the negative DC power supply bus 15 via a constant voltage diode 22 and a thyristor 23. A circuit is configured to stabilize the output voltage of the output line L ₀ located on the cathode side of the diode 20 when the thyristor 23 is turned on. Reference numeral 24 is a comparator, and 25 is a capacitor for smoothing the voltage supplied thereto. The non-inverting input terminal (+) of the comparator 24 is the output line via the diode 26.
The output voltage of the charging circuit 16 is connected to L ₀ , and the inverting input terminal (−) is supplied with the reference voltage which is made constant by the resistor 27 and the constant voltage diode 28. Has become. The output signal from the comparator 24 is smoothed by the capacitor 29, divided by the resistors 30 and 31, and the divided value is given to the gate of the thyristor 23.

Next, 32 is a direct current motor corresponding to a load, one terminal of which is connected to the negative power source bus 15 and the other terminal is connected to the contact a ₂ of the changeover switch 18 and is connected to a switching element. It is connected to the contact a ₁ of the changeover switch 18 via the corresponding PNP type transistor 33. As a result, the DC motor 32 connects the transistors 33 in series when the changeover switch 18 is in the "operating position" to make the first contact group.
Is connected to the battery 17 through 18a, it is adapted to be connected to the output line L _o of the charging circuit 16 via the second contact group 18b. Reference numeral 34 denotes a switching control circuit, which is configured to include resistors 35 and 36 and diodes 37 and 38, and is provided between the positive side terminal of the capacitor 25 for smoothing and the negative DC power supply bus 15 and the resistor 35 and the diode 37. And a resistor 36 connected in series, and a diode 38 having the characteristic shown in the figure is connected between the common connection point of the diode 37 and the resistor 36 and the base of the transistor 33. 39
Is a smoothing capacitor connected to both input terminals of the DC motor 32 for preventing pulsation of the motor terminal voltage, and 40 is a reference voltage changing circuit for lowering the reference voltage given to the comparator 24 in the charging circuit 16. This is configured by connecting a series circuit of a resistor 41 and a transistor 42 to both ends of the constant voltage diode 28, and connecting the base of the transistor 42 to the contact a ₂ of the changeover switch 18 via the resistor 43.

Next, the operation of this embodiment will be described. First, the charging of the battery 17 in the discharged state, the output lines of the DC adapter L ^+, L ^- was connected to the DC power supply bus 14 and 15 of the fan main body, switching operation of the change-over switch 18 to the "charging position" To do.
Then, the changeover switch 18 is changed over as shown by the broken line in FIG. 1, so that the output line L ₀ of the charging circuit 16 is connected to the battery 17 via the first contact group 18a, and the DC power supply busbar 14 to the transistor 19 is connected. The battery 17 is charged via the diode 20, the contacts b ₁ and c ₁ of the first contact group 18a in this order. At the beginning of charging, the terminal voltage of the battery 17 and the voltage of the output line L0 of the charging circuit 16 are low.
The output terminal of 24 is at a low level and the thyristor 23 is off. Therefore, the constant voltage diode 22 is disabled and the base potential of the transistor 19 depends only on that of the DC power supply bus 14. Therefore, the voltage of the DC power bus 14 is applied to the battery 17 as it is, and the battery 17 is rapidly charged. Then, when charging proceeds to some extent and the terminal voltage of the battery 17 exceeds the reference voltage given to the comparator 24, the output terminal of the battery 17 turns to a high level, so that the thyristor 23 turns on and the constant voltage diode 22 operates. Enabled. As a result, the base potential of the transistor 19 becomes a constant voltage and the constant voltage circuit operates, so that the charging voltage to the battery 17 is finally made a constant voltage and small so as not to overcharge. Charging is continued by the current and the terminal voltage reaches a fully charged state in which the terminal voltage is slightly lower than the voltage of the DC power supply bus 14.

To operate with the DC adapter, the changeover switch 18 is switched to the "operating position" while the DC adapter is still connected. Then, each contact group 18a of the changeover switch 18,
Since 18b is switched as shown by the solid line in FIG. 1, the DC power bus 14 is connected to the DC motor 32 through the transistor 19, the diode 20 and the contacts c ₂ and a ₂ of the second contact group 18b in this order. It In addition, this DC adapter is a DC power bus 14,1
In the state of being connected to 5, the DC power is applied to the DC power bus 14 and its voltage is slightly higher than the terminal voltage of the battery 17 in the fully charged state.
The diode 38 of 34 is in a reverse bias state, and no base current flows through the transistor 33. Therefore, the transistor 33
Is turned off, the battery 17 to the DC motor 32
No current is supplied to. Therefore, in this state, the transistor 42 of the reference voltage changing circuit 40 is in the forward bias state, so that the transistor 40 is turned on, the reference voltage in the comparator 24 is lowered to a low value, and the thyristor 23 is always turned on. Therefore, the constant voltage diode 22 of the charging circuit 16 is activated and the constant voltage circuit is in an operating state, and the output line L ₀ of the charging circuit 16 is maintained at a value determined by the Zener voltage of the constant voltage diode 22, which is a commercial voltage. The voltage applied to the DC motor 32 does not change even if the voltage of the DC power supply bus 14 changes due to the voltage change of the power supply 11 or the like.

Next, in order to operate the battery 17, it is sufficient to remove the DC adapter while leaving the changeover switch 18 in the “operating position”. In this state, the battery 17 has the first contact group
Since it is connected to the transistor 33 via 18a, the diode 38 of the switching control circuit 34 is in the forward bias state when the DC adapter is removed and the DC power supply buses 14 and 15 are in the state where no voltage is applied. As a result, the base current flows through the transistor 33, and the transistor 33 naturally turns on, and the battery 17 passes through the transistor 33.
Is supplied to the DC motor 32 to rotate the DC motor 32.

As described above, in this embodiment, although there are three operation modes of charging, operation by the DC adapter, and operation by the battery, the changeover switch for changing the operation mode has two switching modes of "charging position" and "operating position". It only needs to have a position. Therefore, compared with the conventional configuration that requires a changeover switch having three changeover positions, the switch is cheaper and the manufacturing cost can be reduced, and the user can use the DC adapter even in the same operation mode. It is not necessary to operate it separately from the battery, which improves usability. In addition, in order to operate with a DC adapter, it is necessary to stabilize the voltage applied to the DC motor 32 by coping with fluctuations in the power supply voltage, etc. Charging circuit
Since it can be performed by using 16 constant voltage circuits, it is not necessary to separately provide a constant voltage circuit, and rationalization of the circuit configuration can be achieved. Will be possible.

In the above embodiment, the charging circuit 16 has a configuration in which the DC power supply busbar 14 is not charged to a constant voltage at the beginning of charging but is charged to a constant voltage after a certain amount of charging has been performed, but the present invention is not limited to this. Needless to say, the voltage may be constant from the beginning. In addition, the present invention is not limited to the embodiments described above and shown in the drawings. For example, a configuration in which a DC adapter is built in the main body, or application to a device other than a fan such as an electric vacuum cleaner is applied. The present invention can be variously modified and implemented without departing from the scope.

[Effects of the Invention] As described above, the present invention can be achieved by using the changeover switch having two changeover positions.
The manufacturing cost can be reduced, and the usability is significantly improved because the user does not have to distinguish the driving states. Moreover, the constant voltage circuit can be commonly used for charging the battery and stabilizing the supply voltage to the load, so that the circuit configuration is rationalized and the manufacturing cost is also reduced from that point of view. It has excellent effects such as being able to achieve

1 and 2 show an embodiment of the present invention, FIG. 1 is a circuit diagram showing a circuit configuration of a fan body, FIG. 2 is a circuit diagram showing a DC adapter, and FIG. 3 is a conventional example. It is a figure equivalent to FIG.

In the drawing, 14 and 15 are DC power supply buses, 16 is a charging circuit, 17 is a battery, 18 is a changeover switch, and 18a and 18b are first and second
, A DC motor (load), 33 is a transistor (switching element), and 34 is a switching control circuit.

Claims (1)

[Claims] 1. A battery provided in an apparatus body can be charged from a DC power supply busbar to which DC power is rectified from a commercial power supply, and a load is selectively supplied by the DC power from the battery or the DC power supply busbar. A charging circuit provided with a constant voltage circuit for making a charging voltage to the battery constant, and a first and a second contact point group for switching to an operating position and a charging position. In the operating position, the load is connected to the battery by connecting the switching elements in series via the first contact group, and the load is connected to the charging circuit via the second contact group. And a switch for connecting the battery to the charging circuit via the first contact group at the charging position, and the switch when the voltage is applied to the DC power bus. Operation control device for a battery device housing, characterized in that a switching control circuit which forms the switching element in the ON state at the time and no voltage is applied without a switching element in the off state.