JPH0799730A - Charging/discharging apparatus - Google Patents

Abstract

PURPOSE:To supply a power to a load without an interruption even if one of primary and secondary batteries runs out of power by a method wherein the secondary battery is charged by a charging part and one of the primary and secondary battery is connected to a discharging part by a control means to supply a power to the load. CONSTITUTION:A secondary battery 9 is charged by a charging circuit 6. A DC lighting circuit 8 is driven by the power supply from the secondary battery 9 to light a load 5. If a primary battery 20 is connected, a voltage across the primary battery 20 is divided by resistors R1 and R2 and the potential of the dividing point is supplied to the charging circuit 6 to detect the existence of the primary battery 20. A stop signal is given to the charging circuit 6 and, even if a commercial power supply 1 is connected, the operation of the charging circuit 6 is stopped and the charging of the primary battery 20 is prohibited.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging / discharging device having a charging function for charging a battery and a discharging function for supplying power from the battery.

[0002]

2. Description of the Related Art Batteries used when used without a commercial power source are roughly divided into primary batteries that only discharge and secondary batteries that can be charged and can be repeatedly charged and discharged. is there. Due to its characteristics, the primary battery cannot be charged, and if it is charged, problems such as liquid leakage and damage may occur due to structural problems. On the other hand, when using a secondary battery, a charging function for charging the secondary battery must be provided as a built-in device or a separate device. Therefore, conventionally, the one using a primary battery and the one using a secondary battery have been distinguished according to the use of the equipment or device.

FIG. 10 shows a circuit block diagram of a rechargeable lighting fixture using a charging / discharging device to which a secondary battery is connected. The commercial power supply 1 is connected to a power supply circuit 2 including a filter, a rectifier, etc., and a commercial power supply detection circuit 3 and a charging circuit 6 forming a charging unit are connected to the output side thereof, and the commercial power supply detection circuit 3 is connected. The AC lighting circuit 4 is connected to. AC
The lighting circuit 4 is connected to the load 5 via the switch 11,
A secondary battery 9 is connected to the charging circuit 6. Further, the secondary battery 9 is connected to the over-discharge prevention circuit 7 and is also connected to the DC lighting circuit 8 constituting the discharging part via the switch 12, and the DC lighting circuit 8 is connected to the load 5 via the switch 11. It

Normally, when the commercial power source 1 is connected,
A low signal is output from the commercial power supply detection circuit 3. Conversely, when the commercial power supply 1 is cut off, High is output. In response to this signal, the switch 11 outputs the signal L
When the signal is high, the c-terminal is connected to the a-terminal, and when the signal is high, the c-terminal is connected.
The end is connected to the b end. Thus, when the commercial power source 1 is connected, the load 5 is connected to the AC lighting circuit 4, and when the commercial power source 1 is disconnected, the load 5 is connected to the DC lighting circuit 8.

The output of the commercial power source detection circuit 3 is NAN.
It is also connected to one of the input terminals of the D gate 10. N
The output of the overdischarge prevention circuit 7 is connected to the other input terminal of the AND gate 10, and ON / OFF of the switch 12 is determined by the output of the NAND gate 10 which is determined by both signals. The over-discharge prevention circuit 7 prevents deterioration of the secondary battery 9 due to over-discharge, and when the battery voltage of the secondary battery 9 falls below a predetermined value, the power supply to the load 5 side is stopped and the secondary battery 9 is discharged. This is to prevent over-discharge, and the output of the over-discharge prevention circuit 7 is set to High when the battery voltage of the secondary battery 9 is equal to or higher than a predetermined value, and is set to Low when the battery voltage drops below the predetermined value. Switch 12 is NAN
ON when the D gate 10 outputs Low, High
When is output, it turns off.

With such a configuration, when the commercial power supply 1 is connected, Low is input to one input terminal of the NAND gate 10, so that the output of the NAND gate 10 becomes High and the switch 12 is turned off. Become. Further, when the commercial power supply 1 is disconnected and the battery voltage of the secondary battery 9 becomes equal to or lower than a predetermined value, Low is input to one input terminal of the NAND gate 10, so that the switch Although 12 is turned off, when the battery voltage of the secondary battery 9 is equal to or higher than a predetermined value, High is input to all the input terminals of the NAND gate 10, so that the output of the NAND gate (10) becomes Low and the switch 12 is ON
Becomes

Therefore, as a whole circuit, when the commercial power source 1 is connected, the load 5 is supplied by the AC lighting circuit 4.
Lights up, and at the same time, the charging circuit 6 charges the secondary battery 9. Next, when the commercial power supply 1 is cut off, the load 5 becomes A
It is separated from the C lighting circuit 4 and is lit by the DC lighting circuit 8 by the electric power supplied from the secondary battery 9. After that, when the secondary battery 9 is discharged and the charging capacity is further reduced and the battery voltage is reduced to a predetermined value or less, the power supply to the load 5 is stopped.

That is, when the commercial power source 1 is connected, power is supplied from the commercial power source 1, and when the commercial power source is disconnected, power is supplied from the secondary battery 9 to the load 5
Since it can be turned on, it can be used even in a place where there is no commercial power source 1 if it is charged, and it can be used for a wide range of purposes.

[0009]

However, if the charging capacity of the secondary battery 9 is reduced and the power supply is stopped in a place where there is no commercial power source 1 in the surroundings, it cannot be used as a lighting fixture at all. On the other hand, a method of preparing a plurality of precharged secondary batteries 9 and replacing them when necessary is used, but the secondary battery 9 is more expensive than the primary battery, and There is a problem that the secondary battery must be replaced every time the secondary battery 9 is charged, or a separate device dedicated to charging the secondary battery must be prepared.

Therefore, an object of the present invention is to provide a charging / discharging device capable of discharging by a primary battery.

[0011]

According to a first aspect of the present invention, there is provided a charging / discharging device including a primary battery and a secondary battery, a charging unit for charging the secondary battery, a discharging unit connected to a load, the primary battery and And a control means capable of connecting only one of the secondary batteries to the discharge part. A charging / discharging device according to a second aspect of the present invention is the charging / discharging device according to the first aspect, wherein the control means has a battery mounting portion capable of accommodating only one of the primary battery and the secondary battery.

According to a third aspect of the present invention, in the charging / discharging device according to the second aspect, the shapes of the primary battery and the secondary battery are different from each other. A charging / discharging device according to a fourth aspect of the present invention is the charging / discharging device according to the second aspect, which has a detection unit that detects the connection of the primary battery and stops the charging function of the charging unit. A charging / discharging device according to a fifth aspect of the present invention is the charging / discharging device according to the second aspect, including a detection unit that detects the connection of the secondary battery and operates the charging function of the charging unit.

According to a sixth aspect of the present invention, there is provided a charging / discharging device in which an external power source connecting portion, a primary battery, and a secondary battery, a power source detecting circuit for detecting that an external power source is connected to the external power source connecting portion, and the secondary battery. Charging section, an over-discharge preventing section for preventing over-discharging of the secondary battery, a discharging section connected to a load, a detection operation of the power supply detection circuit and the over-discharge preventing section is over-discharged Only the secondary battery is connected to the discharge unit when the prevention operation is not performed, while only the primary battery is discharged when the detection operation of the power supply detection circuit is absent and the overdischarge prevention unit performs the overdischarge prevention operation. And a control means connected to the unit.

According to a seventh aspect of the present invention, there is provided a charging / discharging device in which an external power source connecting portion, a primary battery, and a secondary battery, a power source detecting circuit for detecting that an external power source is connected to the external power source connecting portion, and the secondary battery. A charging section for charging the secondary battery, an over-discharge preventing section for preventing over-discharging of the secondary battery, a discharging section connected to a load, and a detecting section for detecting whether or not the primary battery has a capacity equal to or more than a predetermined value. Then, when there is no detection operation of the power supply detection circuit and the primary battery has a capacity equal to or more than a predetermined value, the secondary battery is prioritized and the primary battery is connected to the discharging unit. is there.

According to an eighth aspect of the present invention, in the charging / discharging device according to the first aspect, the discharging unit performs control so that the same electric power can be output when the voltage of the primary battery and the voltage of the secondary battery are different. A charging / discharging device according to a ninth aspect is the charging / discharging device according to the first aspect, which is applied to the cordless stand.

[0016]

According to the charging / discharging device of the first aspect, the charging section charges the secondary battery, and the control means connects either the primary battery or the secondary battery to the discharging section to supply power to the load. . Therefore, by connecting the charging unit to the external power source and charging the secondary battery when it is in a chargeable state, the control unit can selectively use the primary battery and the secondary battery, and Even when the power of one of the secondary batteries is exhausted, the power supply to the load can be continuously continued by connecting the other.
Moreover, since only one of the primary battery and the secondary battery can be connected to the discharging portion by the control means, it is possible to prevent charging of the primary battery and avoid mutual charging of the primary battery and the secondary battery.

According to the charging / discharging device of claim 2, claim 1
In addition, since the control means has a battery mounting portion capable of accommodating only one of the primary battery and the secondary battery, in addition to the function of claim 1, You can prohibit simultaneous connections. According to the charging / discharging device of the third aspect, in the second aspect, the shapes of the primary battery and the secondary battery are different from each other.

According to the charge and discharge device of claim 4, claim 2
In the above, since the control unit has a detection unit that detects the connection of the primary battery and stops the charging function of the charging unit, the same operation as that of claim 2 is performed, and the charging unit of the charging unit is changed according to the connected battery. Since the charging function can be switched, mutual charging of the primary battery and the secondary battery does not occur, and charging of the secondary battery and non-charging of the primary battery can be realized depending on the type of battery.

According to the charge and discharge device of claim 5, claim 2
In the above, since the control unit has a detection unit that detects the connection of the secondary battery and operates the charging function of the charging unit, the same operation as in claim 4 is achieved. According to the charging / discharging device of the sixth aspect, the power can be supplied to the load by connecting the external power supply to the external power supply connection portion, and the power can also be supplied to the load by the primary battery and the secondary battery. Further, since the secondary battery has the over-discharge prevention unit, it is possible to prevent over-discharge of the secondary battery. Furthermore, when the overdischarge protection unit is not operating because there is no detection operation of the power supply detection circuit that detects the external power supply, only the secondary battery is connected to the discharge unit, and there is no detection operation of the power supply detection circuit. Since only the primary battery is connected to the discharge part when the is activated, the secondary battery is connected to the load first when the external power supply is not connected, and the capacity of the secondary battery decreases and the over discharge prevention part The primary battery is connected to the load when is activated. In addition, the primary battery and the secondary battery can always be electrically disconnected, the mutual charging of the primary battery and the secondary battery can be prevented, and the charging of the primary battery when the external power source is connected should be avoided. You can

According to the charging / discharging device of claim 7, the primary battery is connected to the load in preference to the secondary battery when the external power source is not connected, and the secondary battery is loaded when the primary battery runs out. Since it can be connected to, it has the same effect as in claim 6,
The user can attach / detach the primary battery to / from the device to arbitrarily set the power supply source of the load when the external power supply is not connected.

According to the charge and discharge device of claim 8, claim 1
In the above, since the discharging unit performs control such that the same electric power can be output when the voltage of the primary battery and the voltage of the secondary battery are different, in addition to the function of claim 1, stabilizing the electric power supplied to the load. You can According to the charging / discharging device of the ninth aspect, since the charging / discharging device is applied to the cordless stand in the first aspect, it can be used without an external power source and can also be used with a built-in secondary battery when moving.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, this charging / discharging device is applied to the illumination circuit shown in FIG. 10. FIG. 1 shows only the periphery of the secondary battery 9 in FIG. 10, and the overdischarge prevention circuit 7 and the like are omitted. In this embodiment, the primary battery 20 can be used instead of the secondary battery 9, and the primary battery 20 is used only for power supply without being charged.

That is, this charge / discharge circuit is composed of the primary battery 9
And a secondary battery 20, a charging circuit 6 that is a charging unit that charges the secondary battery 20, a DC lighting circuit 8 that constitutes a discharging unit that supplies power to the load 5, a primary battery 9 and a secondary battery 20. It is provided with a control means 21 capable of supplying only one of the electric powers to the DC lighting circuit 8. Control means 21
2 has a battery mounting portion 16 capable of accommodating only one of the primary battery 9 and the secondary battery 20 as shown in FIG. 2, and detects the connection of the primary battery 20 to stop the charging function of the charging circuit 6. The charging circuit 6 includes a detection unit that operates. The secondary battery 9 has a connector 18 to which a connector 17 can be connected as shown in FIG. 3, and a connector 19 to which a primary battery 20 shown in FIG. 4 can be connected.
The embodiment of the connector 19 comprises an electrode plate 13 and an electrode spring 14. As shown in FIG. 2, these are installed in the battery mounting portion 16 provided in the instrument 15, and when the secondary battery 9 having a battery pack as an example is used, the secondary battery 9 is installed in the battery mounting portion 16. Then, the connector 17 pulled out from the secondary battery 9 is connected to the connector 18 of the device 15 for use. On the other hand, when the primary battery 20 is used, the secondary battery 9
Instead, the primary battery 20 is housed in the battery attachment portion 16, and the primary battery 20 is attached to the connector 19 for use. Since this embodiment shares the mounting space for the primary battery 20 and the secondary battery 9 as shown in FIG. 3, the primary battery 20 and the secondary battery 9 cannot be connected at the same time, and only one of them can be used. Has become.

The connector 17 of the secondary battery 9 is connected to the connector 18.
Is connected, the same operation as that shown in the conventional example is performed, the secondary battery 9 can be charged by the charging circuit 6, and the DC power is supplied from the secondary battery 9.
The lighting circuit 8 can be driven to light the load 5. Further, in order to detect whether or not the primary battery 20 is connected in the charging circuit 6 of the control means 21, resistors R ₁ and R ₂ are connected in series so as to be in parallel with the primary battery 20. When the primary battery 20 is connected to the connector 19, the potential at the voltage dividing point Va obtained by dividing the voltage across the primary battery 20 by the resistors R1 and R2 is input to the charging circuit 6 and the detection unit (not shown) is shown. ), The presence or absence of the primary battery 20 is detected. Dividing point V
When a voltage is generated in a and the connection of the primary battery 20 is detected, the detection unit gives a stop signal to the charging circuit 6 to stop the charging circuit 6 even when the commercial power source 1 is connected, and the primary voltage 20 charging is prohibited.

Further, in this embodiment, D which constitutes the discharge part
The C lighting circuit 8 has a built-in circuit portion for performing control so that the same electric power can be output when the voltage of the primary battery 20 and the voltage of the secondary battery 9 are different. The battery voltage of the primary battery 20 and the battery voltage of the secondary battery 9 are generally different. For example, since the nominal voltage of a manganese dry battery (primary battery) is 1.5 V and the nominal voltage of a nickel-cadmium storage battery (secondary battery) is 1.2 V, the power supply from the primary battery 20 is considered in consideration of these. In the case of, that is, when the connection of the primary battery 20 is detected by the voltage dividing point Va, a signal is given to the DC lighting circuit 8 to switch to a control level according to the battery voltage of the primary battery 20, and The load 5 is turned on with the same output as when the 9 is used. Here, the voltage dividing point Va of the resistors R ₁ and R ₂
Since the voltage of the diode is the diode D1, the voltage is not generated when the secondary battery 9 is connected, and the voltage is generated only when the primary battery 20 is connected. It can be easily detected.

As described above, when the commercial power source 1 is present, the commercial power source 1 can supply power to the load 5, and at the same time, if the secondary battery 9 is connected, it can be charged by the charging circuit 6. When the battery is charged and the commercial power source 1 is cut off, the charged secondary battery 9 can supply power to the load 5, and when the charge capacity of the secondary battery 9 is reduced, the primary battery 20 It is possible to realize a charging / discharging circuit in which power can be supplied from the primary battery 20 by connecting with, and the primary battery 20 is not charged even when the commercial power supply 1 is connected at this time.

According to this embodiment, the primary battery 20 and the secondary battery 9 can be selectively used by the control means 21, and even if the power of either the primary battery 20 or the secondary battery 9 is lost, the other battery is not used. By connecting, the power supply to the load 5 can be continuously continued. Moreover, the control means 21 controls the primary battery 20 and the secondary battery 9
Since only one side can be connected to the discharge part,
It is also possible to prevent the charging to 0 and the mutual charging of the primary battery 20 and the secondary battery 9.

Further, since the control means 21 has the battery mounting portion 16 capable of accommodating only one of the primary battery 20 and the secondary battery 9, the simultaneous connection of the primary battery 20 and the secondary battery 9 is easily prohibited. be able to. Since the control unit 21 has a detection unit that detects the connection of the primary battery 20 and stops the charging function of the charging unit, it is possible to switch the charging function of the charging unit according to the connected battery. Mutual charging of the secondary battery 9 does not occur, and charging of the secondary battery and non-charging of the primary battery can be realized depending on the type of battery.

In addition, the DC lighting circuit 8 which constitutes the discharge part is
When the voltage of the primary battery 20 and the voltage of the secondary battery 9 are different
Since the control that can output the same power is performed, supply to the load 5 is performed.
The power supply can be stabilized. Furthermore, this charge and discharge
The device can be applied to a cordless stand and powered by an external power supply.
It can be used without a certain commercial power source 1
Use the built-in secondary battery 9 when moving the stand
be able to. Incidentally, the resistance R of this embodiment₁, R ₂Is
Although the potential of the primary battery 20 was detected, the secondary battery 9 was connected.
Alternatively, the secondary battery 9 may be detected.

The second embodiment of the present invention is shown in FIGS.
Shown in. That is, in the charging / discharging device according to the first embodiment, the primary battery 20 and the secondary battery 9 have different shapes from each other, and the presence / absence of the connection of the primary battery 20 is detected to perform the charging function of the charging circuit 6. It controls the circuit section which operates and switches to the control level according to the battery voltage of the DC lighting circuit 8 which is the discharge section.

The battery mounting portion 16 of the device 15 has a shape capable of individually storing the primary battery 20 and the secondary battery 9 having different shapes. The connectors 18 and 19 are common to those in FIG. 2, and common parts are denoted by the same reference numerals. Reference numeral 25 is a secondary battery holding plate provided in the battery mounting portion 16, and 23 is a switch for detecting connection of the secondary battery 20. When the secondary battery 9 is attached, the position is determined by the secondary battery holding plate 20 as shown in FIG. 4A, and the connector 17 attached to the secondary battery 9 is connected to the connector 18 for use. At this time, depending on the shape of the secondary battery 9, the switch 23
Is pushed up and the switch 23 is turned on.

When the primary battery 20 is stored, the primary battery 20
From the structure of the battery mounting portion 16, as shown in FIG.
Although it is attached to the connector 19, it is OFF because the switch 23 is not pressed. From the above, the secondary battery 2
Since the switch 23 is turned on only when 0 is connected,
It is detected and input to the detection section of the charging circuit 6 as shown in FIG. 7, and only when the secondary battery 9 is connected, the charging circuit 6 is operated when the commercial power source 1 is connected, When the secondary battery 9 is not connected or when the primary battery 20 is connected, the charging circuit 6 is controlled to remain stopped even if the commercial power source 1 is connected, or the DC lighting circuit 8 is switched on. By sending the signal of the switch 23, it becomes possible to switch the control of the DC lighting circuit 8 according to the battery voltage of the primary battery 9 and the secondary battery 20 by the circuit unit.

Although the switch 23 of this embodiment detects the secondary battery 9, the switch 23 may be configured to be pushed when the primary battery 20 is attached to detect the primary battery 20. A third embodiment of the present invention is shown in FIG. That is,
This charging / discharging device includes an external power supply connection section 27, a primary battery 9 and a secondary battery 20, a power supply detection circuit 3 for detecting that the external power supply connection section 27 is connected to a commercial power supply 1 which is an external power supply, and A charging circuit 6 that is a charging unit that charges the secondary battery 9, an over-discharge prevention circuit 7 that is an over-discharge prevention unit that prevents over-discharge of the secondary battery 9, and a DC that constitutes a discharging unit connected to the load 5. The lighting circuit 8 and the control means 21 are provided.

In this embodiment, even when the primary battery 20 is connected, the secondary battery 9 can be used while being connected, and the secondary battery 9 need not be attached or detached. The control means 21 connects only the secondary battery 9 to the DC lighting circuit 8 when the detection operation of the power supply detection circuit 3 is not performed and the overdischarge protection circuit 7 is not overdischarge protection operation, while the detection of the power supply detection circuit 3 is performed. Only the primary battery 20 is connected to the DC lighting circuit 8 when there is no operation and the over-discharge prevention circuit 7 performs the over-discharge prevention operation.

The control means 21 of the embodiment is the power supply detection circuit 3
NAND gate IC whose input end is connected to₁, IC
₂And NAND gate IC₁Secondary connected to the output of
Battery selector switch 30 and NAND gate IC₂Output
And a primary battery changeover switch 31 connected to the end,
AND gate IC₁Of the over-discharge prevention circuit 7 to the other input terminal of
Output terminal is connected, IC₂NAND gate IC₂Other
NOT gate IC at the input end ₃Over-discharge prevention circuit 7 via
The output end of is connected.

As described with reference to FIG. 10, the commercial power supply detection circuit 3 outputs Low when the commercial power supply 1 is connected, and outputs High when the commercial power supply 1 is not connected, and the over-discharge prevention circuit 7 outputs the battery voltage of the secondary battery 9 to the over-discharge prevention circuit 7. High is output when the value is equal to or higher than the predetermined value, and Low is output when the value is equal to or lower than the predetermined value. The changeover switches 30 and 31 are turned on when a Low signal is given,
It is assumed to be OFF when the high signal is given.

Therefore, the commercial power source 1 is connected.
In case of NAND gate IC₁, IC ₂Each input of
Since Low is input to at least one of the terminals,
The output of each becomes High, and the changeover switches 30, 3
Both 1 are turned off. As a result, when the commercial power source 1 is connected
Is connected to the switch 3 even if the primary battery 20 is connected.
Since it was disconnected by 0 and 31, it will not be charged.
Yes. Therefore, at this time, the secondary battery 9 is charged by the charging circuit 6.
Is recharged, and both changeover switches 30 and 31 are OF
Because of F, no power is supplied from the battery.

Next, when the commercial power source 1 is cut off and the battery voltage of the secondary battery 9 is equal to or higher than a predetermined value, the commercial power source detection circuit 3 outputs High and the overdischarge prevention circuit 7 outputs High. Is output. Therefore, since all the inputs of the NAND gate IC1 are High, the output is Low and the changeover switch 30 is ON. On the other hand, the high output of the overdischarge prevention circuit 7 is the NOT gate I
The output of NAND gate IC2 is High because it is inverted to Low by C3 and input to NAND gate IC2.
Then, the changeover switch 31 is turned off. As a result, the secondary battery 9 can drive the DC lighting circuit 8 that is the discharging unit to supply power to the load 5, and the primary battery 20 is disconnected by the changeover switch 31.
The rechargeable battery 9 is not charged, and the load 5 is not supplied with power.

Next, when the commercial power supply 1 is disconnected and the battery voltage drops below a predetermined value due to the discharge of the secondary battery 9,
High from the commercial power source detection circuit 3 and over-discharge prevention circuit 7
Outputs Low. Therefore, Low is input to one of the inputs of the NAND gate IC _{1, and} the output is H
Then, the changeover switch 30 is turned off. Further, the Low output of the overdischarge prevention circuit 7 is a NOT gate IC.
Since it is inverted to High by 3, the NAND gate I
The inputs of C2 are all High, the outputs thereof are Low, and the changeover switch 31 is ON. Therefore, the primary battery 20 can drive the DC lighting circuit 8 that is the discharging unit to supply power to the load 5, and the primary battery 20 can be used.
Since the secondary battery 9 is disconnected by the changeover switch 30, the secondary battery 9 is not charged by the primary battery 20.

With the above configuration, when the commercial power supply 1 is connected, the load 5 is turned on by the commercial power supply 1 and the secondary battery 9 is charged, and when the commercial power supply 1 is disconnected,
When the battery voltage of the secondary battery 9 is equal to or higher than a predetermined value, the secondary battery 9
When the load 5 is lit by the above and the battery voltage of the secondary battery 9 becomes equal to or lower than a predetermined value, it is possible to switch to the mode in which the load 5 is lit by the primary battery 20, and the charging of the primary battery 20 and the primary battery 20 Also, mutual charging of the secondary battery 9 and the like can be prohibited.

According to this embodiment, the external power supply connection 27
Power can be supplied to the load 5 by connecting the commercial power supply 1 which is an external power source to the load 5, and also the power can be supplied to the load 5 by the primary battery 20 and the secondary battery 9.
Further, since the overdischarge prevention circuit 7 is provided, the overdischarge of the secondary battery 9 can be prevented. Further, when there is no detection operation of the power supply detection circuit 3 for detecting the commercial power supply 1 and the over-discharge prevention circuit 7 is not operating, only the secondary battery 9 is the discharging unit D.
When the commercial power supply 1 is not connected, since the primary battery 20 is connected to the C lighting circuit 8 and the overdischarge prevention circuit 7 operates without the detection operation of the power supply detection circuit 3. The secondary battery 9 is connected to the load 5 first, and the primary battery 20 is connected to the load 5 when the capacity of the secondary battery 9 decreases and the overdischarge prevention circuit 7 operates. Further, the primary battery 20 and the secondary battery 9 can always be electrically disconnected, the mutual charging of the primary battery 20 and the secondary battery 9 can be prevented, and the primary battery 20 when the commercial power source 1 is connected.
It is also possible to avoid charging to.

A fourth embodiment of the present invention is shown in FIG. That is, in this charging / discharging device, the control means in the third embodiment has a detection unit for detecting the presence / absence of the capacity of the primary battery which is equal to or more than a predetermined value, and the detection operation of the power supply detection circuit 3 does not occur and the primary battery 20 When the battery has a capacity of a predetermined value or more, the primary battery 20 is connected to the DC lighting circuit 8 which is the discharge unit in priority to the secondary battery 9, and the primary battery 20 is connected to the secondary battery 9 when the primary battery 20 is connected. Power will be given priority.

The control means of this embodiment is the power supply detection circuit 3
NAND gates IC ₁ and IC whose input terminals are connected to
₂ , a secondary battery changeover switch 30 connected to the output end of the NAND gate IC ₁ , a primary battery changeover switch 31 connected to the output end of the NAND gate IC ₂ , and a resistor connected in parallel to the primary battery 20. A series circuit of R ₁ and R ₂ ,
The comparator IC ₄ having the voltage dividing point connected to the input end and the reference power source 32 connected to the other input end,
The output terminal of C ₄ is connected to the other input terminal of the NAND gate IC ₂ , and the output terminal of the overdischarge prevention circuit 7 is connected to the other input terminal of the NAND gate IC ₁ , and the comparator I
The output terminal of C ₄ is connected to the other input terminal of the NAND gate IC ₁ via the NOT gate IC ₃ .

The commercial power supply detection circuit 3, the overdischarge prevention circuit 7, and the changeover switches 30 and 31 perform the same operations as in the third embodiment. When the commercial power source 1 is connected, the third
Similarly to the embodiment described above, the outputs of the NAND gates IC ₁ and IC ₂ are High, and the changeover switches 30 and 31 are OFF. Therefore, at this time, the secondary battery 9 is charged, but power is not supplied from the secondary battery 9 and the primary battery 20 to the load 5.

Next, when the commercial power source 1 is disconnected, the primary battery 20 is connected, and the battery voltage of the primary battery 20 is equal to or higher than a predetermined voltage, the voltage is set to the resistors R1 and R2.
The voltage Va divided by is the reference voltage Vref of the reference power supply 32.
By setting as described above, the output of the comparator IC ₄ becomes High. Therefore, the NAND gate I
The output of C ₂ becomes Low, and the changeover switch 31 becomes ON. Further, the output of the NAND gate IC ₁ becomes High and the changeover switch 30 is turned OFF. Load 5
Will be operated by the power supply from the primary battery 20.

Next, if the commercial power source 1 is disconnected,
The secondary battery 20 is not connected or the primary battery 20 is connected.
Even if the battery voltage is below the specified value,
Since Va becomes lower than the reference voltage Vref, the comparator IC
_FourOutput becomes Low. Therefore, the NAND gate IC
₂Output goes high, while the NAND gate IC ₁
Indicates that the battery voltage of the secondary battery 9 is equal to or higher than a predetermined value,
If the output of the stop circuit 7 is High, a NAND gate IC
₁Output becomes Low. Therefore, the changeover switch 31
It turns off, the changeover switch 30 turns on, and the load 5
Operates by the power supply from the secondary battery 9.

As described above, when the primary battery 20 is connected when the commercial power supply 1 is disconnected, the primary battery 2
0 is given priority and power is supplied to the load 5, and the primary battery 20
Is not connected, or when the battery voltage of the connected primary battery 20 is below a predetermined value, power can be supplied from the secondary battery 9, and the primary battery 20 can be charged and the primary battery 20 can be charged.
Mutual charging of the secondary battery 9 and the like can be prohibited.

According to this embodiment, when the power supply detection circuit 3 for detecting the commercial power supply 1 does not perform the detection operation and the overdischarge prevention circuit 7 is not operating, only the secondary battery 9 is turned on by the DC lighting circuit 8.
When the commercial power supply 1 is not connected, the secondary battery is connected to the DC lighting circuit 8 when the over-discharge prevention circuit 7 operates without the detection operation of the power supply detection circuit 3. The battery 9 is connected to the load 5 first, and the secondary battery 9
The primary battery 30 is connected to the load 5 when the capacity of 1 decreases and the over-discharge prevention circuit 8 operates. Also, always the primary battery 20
And the secondary battery 9 can be electrically disconnected, the mutual charging of the primary battery 20 and the secondary battery 9 can be prevented, and the charging of the primary battery 20 when the commercial power source 1 is connected is also avoided. be able to. Other than that, there are the same operational effects as the third embodiment.

Although omitted in this embodiment for the purpose of explaining the basic operation, the battery voltage is actually the battery voltage when the load 5 is being supplied with respect to the battery voltage when the load 5 is stopped. Since the comparator IC ₄ of this embodiment has a characteristic of increasing, it is necessary to perform processing such as giving a hysteresis characteristic. In addition, in the third and fourth embodiments, for example, a NAND gate IC
It is also possible to control the DC lighting circuit 8 of the discharge section so as to operate according to the battery voltage of the primary battery 20 by the output of ₂ .

Further, in the present invention, the control means and the like in each embodiment are not limited to the means described here,
Any other method may be used as long as the operations and functions are satisfied, and the present invention is not limited to the configuration of the embodiment. In addition, although the lighting device has been described in this embodiment, the lighting device is not limited to the lighting device, and any device having a battery charging function and a charging / discharging device for supplying power from the battery may be used. The shape of the battery is also the primary battery 20.
Any type may be used as long as it can be distinguished from the secondary battery 9.
Furthermore, although the battery pack in which the connector 17 is attached to the secondary battery 9 is used, the present invention is not limited to this, as long as the attachment to the device 15 can be distinguished from the primary battery 20, and the primary battery Similarly, 20 is the first embodiment and the second.
The embodiment is not limited to this.

[0051]

According to the charging / discharging device of the first aspect, the secondary battery is charged by the charging unit, and the control unit connects either the primary battery or the secondary battery to the discharging unit to supply power to the load. Therefore, by connecting the charging unit to the external power source and charging the secondary battery when it is in a chargeable state, the control unit can selectively use the primary battery and the secondary battery, and the primary battery can be used. Even when the power of one of the secondary batteries is exhausted, the power supply to the load can be continuously continued by connecting the other.
Moreover, since only one of the primary battery and the secondary battery can be connected to the discharging portion by the control means, it is possible to prevent the charging of the primary battery and avoid mutual charging of the primary battery and the secondary battery. There is.

According to the charging / discharging device of claim 2, claim 1
In addition, since the control means has a battery mounting portion capable of accommodating only one of the primary battery and the secondary battery, in addition to the effect of claim 1, You can prohibit simultaneous connections. According to the charging / discharging device of the third aspect, in the second aspect, since the shapes of the primary battery and the secondary battery are different from each other, the same effect as the second aspect is obtained.

According to the charge and discharge device of claim 4, claim 2
In the above, since the control unit has a detection unit that detects the connection of the primary battery and stops the charging function of the charging unit, the same effect as in claim 2 is obtained, and the charging unit of the charging unit is changed according to the connected battery. Since the charging function can be switched, mutual charging of the primary battery and the secondary battery does not occur, and charging of the secondary battery and non-charging of the primary battery can be realized depending on the type of battery.

According to the charge and discharge device of claim 5, claim 2
In the above, since the control unit has the detection unit that detects the connection of the secondary battery and operates the charging function of the charging unit, the same effect as claim 4 is obtained. According to the charging / discharging device of the sixth aspect, the power can be supplied to the load by connecting the external power supply to the external power supply connection portion, and the power can also be supplied to the load by the primary battery and the secondary battery. Further, since the secondary battery has the over-discharge prevention unit, it is possible to prevent over-discharge of the secondary battery. Furthermore, when the overdischarge protection unit is not operating because there is no detection operation of the power supply detection circuit that detects the external power supply, only the secondary battery is connected to the discharge unit, and there is no detection operation of the power supply detection circuit. Since only the primary battery is connected to the discharge part when the is activated, the secondary battery is connected to the load first when the external power supply is not connected, and the capacity of the secondary battery decreases and the over discharge prevention part The primary battery is connected to the load when is activated. In addition, the primary battery and the secondary battery can always be electrically disconnected, the mutual charging of the primary battery and the secondary battery can be prevented, and the charging of the primary battery when the external power source is connected should be avoided. You can

According to the charging / discharging device of the seventh aspect, the primary battery is connected to the load in preference to the secondary battery when the external power source is not connected, and the secondary battery is loaded when the primary battery runs out. Since it can be connected to, it has the same effect as in claim 6,
The user can attach / detach the primary battery to / from the device to arbitrarily set the power supply source of the load when the external power supply is not connected.

According to the charge and discharge device of claim 8, claim 1
In the above, since the discharging unit performs control so that the same electric power can be output when the voltage of the primary battery and the voltage of the secondary battery are different, in addition to the effect of claim 1, stabilizing the electric power supplied to the load You can According to the charging / discharging device of the ninth aspect, since the charging / discharging device is applied to the cordless stand in the first aspect, it can be used without an external power source and can also be used with a built-in secondary battery when moving.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part of a first embodiment of the present invention.

FIG. 2 is a partial front view showing a battery mounting portion of the device.

FIG. 3 is a front view of a secondary battery.

FIG. 4 is a front view of a primary battery.

FIG. 5 is a front view of a battery mounting portion according to a second embodiment.

FIG. 6 (a) is a front view of a state in which a secondary battery is stored, (b).
[FIG. 3] is a front view of a storage state of a primary battery.

FIG. 7 is a circuit diagram of a main part.

FIG. 8 is a circuit diagram of a main part of a third embodiment.

FIG. 9 is a circuit diagram of an essential part of a fourth embodiment.

FIG. 10 is a lighting circuit diagram in a state where a conventional charging / discharging device is applied.

[Explanation of symbols]

 5 load 6 circuit for charging section 7 circuit for over-discharge prevention section 8 DC lighting circuit for discharging section 9 secondary battery 16 battery mounting section for controlling means 20 primary battery

Claims (9)

[Claims] 1. A primary battery and a secondary battery, a charging unit for charging the secondary battery, a discharging unit connected to a load, and the discharging unit for only one of the primary battery and the secondary battery. A charging / discharging device having a control means capable of being connected to the. 2. The charging / discharging device according to claim 1, wherein the control means has a battery mounting portion capable of accommodating only one of the primary battery and the secondary battery. 3. The charging / discharging device according to claim 2, wherein the primary battery and the secondary battery have mutually different shapes. 4. The charging / discharging device according to claim 2, wherein the control unit has a detection unit that detects connection of the primary battery and stops a charging function of the charging unit. 5. The charging / discharging device according to claim 2, wherein the control unit has a detection unit that detects a connection of the secondary battery and operates a charging function of the charging unit. 6. An external power supply connection unit, a primary battery, and a secondary battery, a power supply detection circuit that detects that an external power supply is connected to the external power supply connection unit, and a charging unit that charges the secondary battery. When an over-discharge prevention unit that prevents over-discharge of the secondary battery, a discharge unit that is connected to a load, and there is no detection operation of the power supply detection circuit and the over-discharge prevention unit is not over-discharge prevention operation Control means for connecting only the secondary battery to the discharge part while connecting the primary battery only to the discharge part when the power supply detection circuit does not perform a detection operation and the overdischarge prevention part operates to prevent overdischarge. Charge / discharge device equipped with. 7. An external power supply connection section, a primary battery, and a secondary battery, a power supply detection circuit that detects that an external power supply is connected to the external power supply connection section, and a charging section that charges the secondary battery. An over-discharge prevention unit for preventing over-discharge of the secondary battery, a discharge unit connected to a load, and a detection unit for detecting the presence or absence of the capacity of the primary battery of a predetermined value or more A charging / discharging device comprising: a control unit that connects the primary battery to the discharge unit with priority over the secondary battery when there is no detection operation and the primary battery has a capacity equal to or larger than a predetermined value. 8. The charging / discharging device according to claim 1, wherein the discharging unit performs control such that the same electric power can be output when the voltage of the primary battery and the voltage of the secondary battery are different. 9. A cordless stand applied to a cordless stand.
The charging / discharging device described.