JPH11155240A - Battery automatic separating circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery automatic separating circuit, in which a battery can be detached automatically from an equipment at times of non-use, manually operated separation works on new components are not required and the stop operation of the equipment can be conducted surely and by which fire extinguishing operation at the time of the stoppage of a combustion equipment can be performed safely. SOLUTION: This battery automatic separating circuit has an operating switch 9 which functions as a power switch connected to a battery 11 in combination, a self-holding means 4 for holding a fixed state by operation, a detecting means for detecting the operating state of the operating switch 9, a control means 2 capable of actuating the self-holding means 4 and a power supply means for supplying the control means 2 with a power supply. The control means 2 interrupts the power supply to each load from the battery 11, by operating the self-holding means 4 on the basis of the detecting result of the detecting means, and detaches the battery 11 from each load.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic battery disconnection circuit for various devices operated by a battery power source, which can prevent the battery from discharging when the device is stopped or stored, thereby extending the life of the battery.

[0002]

2. Description of the Related Art Conventionally, for example, a battery mounted on a combustion device such as a heater for heating uses a load as shown in FIG.
And are connected as shown in FIG. The connection circuit shown in FIG. 4 is a circuit in which a battery B made of, for example, a lead battery is directly connected to a load F whose operation is turned on and off by an operation switch S1, and in this connection circuit, the operation switch S1 is connected. When the load F is turned off and the operation of the load F is stopped, an idle current is supplied from the battery B to a control circuit inside a device which is a part of the load F, so that the control circuit becomes operable. .

The connection circuit shown in FIG. 5 is a circuit in which a battery B is connected via a power switch S2 to a load F whose operation is turned on / off by an operation switch S1, and in this connection circuit, When the power switch S2 is turned off, the battery B is completely disconnected from the load F.

[0004]

In the connection circuit shown in FIG. 4, however, an idle current always flows from the battery B to the control circuit in the load F even after the operation is stopped or when the storage circuit is not in use. Therefore, there is a problem that the battery B needs to be artificially removed from the load F when not in use in order to prevent the discharge of the battery B when not in use. Further, in the connection circuit shown in FIG. 5, although it is not necessary to remove the battery B when not in use,
Power switch S2 for disconnecting battery in connection circuit
There is a problem that a new component such as a (switch) is required.

Further, in any of the connection circuits shown in FIGS. 4 and 5, the disconnection of the battery B from the load F is performed by an artificial operation such as removal from the device or operation of the power switch S2. However, there is a problem that the battery B cannot be automatically disconnected from the device.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to automatically disconnect a battery from a device when not in use, to perform a manual disconnection operation and a new operation. It is an object of the present invention to provide an automatic battery disconnection circuit which can eliminate unnecessary components. Another object of the present invention is to provide a battery automatic disconnection circuit capable of reliably performing a stop operation of a device, in addition to the object of the present invention.
An object of the invention described in claim 4 or 5 is to provide, in addition to the objects of the inventions described in claims 1 to 3, an automatic battery disconnection circuit capable of safely performing a fire extinguishing operation when the combustion equipment is stopped.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, an operation switch serving also as a power switch connected to a battery, and a predetermined state is maintained by being operated. Self-holding means, detecting means for detecting the operation state of the operation switch, control means capable of operating the self-holding means, and power supply means for supplying power to the control means. By operating the self-holding means based on the detection result, the power supply from the battery to each load is cut off, and the battery is disconnected from each load.

With this configuration, when the operation switch is turned off, for example, to stop a device that is operating, the detection unit detects this state, and the control unit recognizes this. The control means, for example, turns on the self-holding means based on this recognition, and by the on-operation of the self-holding means, the off state of the operation switch connected to the battery is invalidated. Power is supplied to a predetermined load.

The self-holding means is turned off by the control means a predetermined time after the operation switch is turned off, and the supply of battery power to a predetermined load is cut off. As a result, the supply of the battery power to all the loads connected to the operation switch and the self-holding means is completely shut off, and the battery is disconnected from each load. Therefore, the battery is automatically disconnected from each load simply by turning off the operation switch without separately providing a disconnection switch or the like, so that a manual operation for disconnection is not required.

[0010] The invention according to claim 2 is characterized in that the power supply means is configured to be able to supply battery power through both the operation switch and the self-holding means. With this configuration, a power supply capable of activating the control unit is supplied via both the operation switch and the self-holding unit, and the self-holding unit is turned on even when the operation switch is off. As long as the operation is on, the control means is in an operable state, and for example, the stop operation of the device can be reliably performed.

According to a third aspect of the present invention, the power supply means is connected to the three-terminal regulator and the input side of the three-terminal regulator, and the three-terminal regulator is provided when the power supply from the battery to the power supply means is cut off. It has a capacitor for delaying the stop of the regulator. With such a configuration, even when the supply of the battery power to the power supply means is cut off, the power supply means can be operable for a predetermined time by the capacitor, and the equipment can be stably stopped. Operation can be performed.

According to a fourth aspect of the present invention, the self-holding means has a self-holding relay, and a normally open contact of the self-holding relay is connected in parallel with the operation switch. The operation switch is connected to a pump of the combustion device. With this configuration, the post-purge operation when the combustion equipment is stopped can be reliably performed, and a safe fire extinguishing operation when the combustion equipment is stopped can be performed.

According to a fifth aspect of the present invention, another normally open contact of the self-holding relay is connected between the operation switch and the pump. With this configuration, the operation of stopping the pump is ensured, and the operation of extinguishing the combustion section when the combustion device is stopped can be performed more safely.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIGS. 1 and 2 show an embodiment in which the automatic battery disconnection circuit according to the present invention is used in a combustion device such as an infrared heater capable of generating infrared rays by burning fuel by a burner. FIG. 2 is a timing chart showing the operation of each load and the like.

In FIG. 1, an automatic battery disconnection circuit 1 has a control circuit 2 provided as a control means provided inside a combustion device. The control circuit 2 includes a voltage detection circuit 3 serving as a detection means, A self-holding circuit 4 as self-holding means and a power supply circuit 5 as power supply means are connected. The control circuit 2 is formed of, for example, an 8-bit microcomputer having a CPU 6, and a terminal 2a of the control circuit 2 is connected to a connection point of the series-connected resistors 7 and 8 constituting the voltage detection circuit 3.

One end of the resistor 7 connected in series is connected to a plus terminal of a battery 11 such as a lead battery through an operation switch 9 also serving as a power switch and a fuse 10, and one end of the resistor 8 is grounded. ing. Also,
One end of the resistor 7 is connected to a power supply circuit 5 via a diode 12 for preventing backflow, and is also connected to a power supply line 13 for a fan and an ignition transformer.

The power supply circuit 5 includes a three-terminal regulator 15
The input terminals of the three-terminal regulator 15 include:
The diode 16 for preventing backflow is connected, the plus side of the electrolytic capacitor 17 whose minus side is grounded is connected, and the output terminal of the three-terminal regulator 15 is connected to the terminal 2b of the control circuit 2. Electrolytic capacitor 17 connected to the input terminal of three-terminal regulator 15
As a result, the power cutoff to the control circuit 2 is delayed as described later.

The diode 16 of the power supply circuit 5 is connected to the diode 12 and to the self-holding circuit 4. The self-holding circuit 4 has a contact 18a composed of a normally open contact (NO contact: Normal Open contact).
Self-holding relay 18 having
8 and a transistor 19 connected in series.

The transistor 19 has a base connected to the terminal 2c of the control circuit 2, an emitter grounded, and a collector connected to one end of a self-holding relay 18 (coil). The other end of the self-holding relay 18 (coil) is connected to the battery 11 via the diode 12, the operation switch 9, and the like. Therefore, when the transistor 19 is turned on with the operation switch 9 turned on, the battery power is supplied to the self-holding relay 18 to be turned on, and the contact 18a is closed.

The contact 18a of the self-holding relay 18
Is connected in parallel to the operation switch 9, one end is connected to the battery 11 via the fuse 10, and the other end is connected to the power supply line 13. The operation switch 9 is connected to a power supply line 14 for a pump.

Next, the operation of the battery disconnecting circuit 1 will be described with reference to the timing chart of FIG.
First, as shown in FIG. 2A, when the operation switch 9 is turned on at time t0, battery power is supplied to the three-terminal regulator 15 of the power supply circuit 5 via the diode 12, and the three-terminal regulator 15 It operates and a predetermined DC power is supplied to the control circuit 2. At the same time as the operation switch 9 is turned on, the battery voltage is supplied to the resistors 7 and 8 of the voltage detection circuit 3, and the predetermined voltage divided by the resistors 7 and 8 is input to the control circuit 2 via the terminal 2a. Is done. The control circuit 2 recognizes the ON state of the operation switch 9 based on the voltage.

When power is supplied from the power supply circuit 5 and the ON state of the operation switch 9 is recognized by the voltage from the voltage detection circuit 3, the control circuit 2 outputs a control signal to each load of the combustion equipment to operate. To start. As shown in FIG. 2 (b), the operation of the combustion equipment is started at the time t0 when the operation switch 9 is turned on and the fan is rotated at the same time, and after the time t1 at which the fan reaches the predetermined number of revolutions elapses (or simultaneously). ), The control circuit 2 outputs a “close signal” from the terminal 2 c to the self-holding circuit 4.

According to the "close signal" from the control circuit 2,
A bias voltage is supplied to the transistor 19 of the self-holding circuit 4 so that the transistor 19 is turned on.
A current flows through 8 to turn it on. When the self-holding relay 18 is turned on, the contact 18a is turned on and closed as shown in FIG. 4 (c), regardless of whether the operation switch 9 is on or off, that is, the function of the operation switch 9 is invalidated. Battery power is supplied to the power supply line 13 via 18a.

At approximately the same time as the "close signal" from the control circuit 2, the ignition transformer and the pump are turned on and operated as shown in FIGS. The ignition transformer and the pump can be turned on by supplying power from the battery 11 at the same time as the operation switch 9 is turned on. The control circuit 2 controls the turn-on timing. When the ignition transformer and the pump are turned on, a burner (not shown) burns. The ignition transformer is turned off by the control signal of the control circuit 2 after operating for a predetermined time t2 after detecting the flame.

When the operation of the combustion equipment is stopped, the operation is performed by turning off the operation switch 9. By turning off the operation switch 9, the battery voltage is not supplied to the resistors 7, 8 of the voltage detection circuit 3. When the control circuit 2 recognizes this, the supply of battery power to the pump by the power supply line 14 is cut off, and the pump stops.
At this time, although the supply of the battery power to the fan via the operation switch 9 is cut off, the battery power is supplied by the contact 18a of the self-holding relay 18 which is kept on, and the operation of the fan is continued. You. The rotation of the fan after the operation switch 9 is turned off performs a post-purge operation such as cooling of the combustion device body.

After the control circuit 2 recognizes that the operation switch 9 has been turned off by the detection signal of the voltage detection circuit 3, for example, it activates a built-in timer, and when a preset time t3 (post-purge time) elapses, An “open signal” is output from the terminal 2 c to the self-holding circuit 4. With this “open signal”, the transistor 19 of the self-holding circuit 4 is turned off, the supply of battery power to the self-holding relay 18 is cut off, and the self-holding relay 18 is turned off. When the self-holding relay 18 is turned off, the contact 18a is opened and the supply of battery power to the fan is stopped. The fan rotates for a predetermined time due to its inertia even when the supply of battery power is stopped, and then stops completely.

On the other hand, CP, which is the heart of the control circuit 2,
Even when the operation switch 9 is turned off, battery power is supplied to the power supply circuit 5 via the contact 18a while the contact 18a of the self-holding relay 18 is on even when the operation switch 9 is turned off. Then, DC power is supplied from the power supply circuit 5 to the CPU 6, so that the CPU 6 maintains an operable state.

When the self-holding relay 18 is turned off and the contact 18a is opened, the supply of the battery power to the power supply circuit 5 is cut off. However, since the electrolytic capacitor 17 provided in the power supply circuit 5 is charged by the battery power supply, the electric power of the electrolytic capacitor 17 activates the power supply circuit 5 for a predetermined time. Therefore, the power supplied from the power supply circuit 5 to the CPU 6 of the control circuit 2 is not stopped at the same time as the self-holding relay 18 is turned off, but is stopped after a predetermined time, so that the control circuit 2
Eliminates excessive periods of instability.

As described above, according to the automatic battery disconnection circuit 1 of the above embodiment, when the operation switch 9 is turned off after the use of the combustion equipment, the contact 18a of the self-holding relay 18 is opened after a lapse of a predetermined time t3, Since the supply of the battery power to the pump and the fan is cut off, the battery 11 is not artificially removed from each load of the device, and a new component such as a power switch dedicated to the battery cut other than the operation switch 9 is not provided. , Operation switch 9
By simply turning off the battery, the battery 11 can be reliably disconnected from each load.

When the operation switch 9 is turned off, the battery 11 is automatically disconnected from each load after a predetermined time, so that no manual operation is required. For these reasons, for example, when the combustion equipment is stored for a long time in summer, it is not necessary to remove the battery 11 from the equipment body one by one, and no special manual operation is required, thereby improving the usability of the combustion equipment. be able to.

Further, since the contact 18a of the self-holding relay 18 is connected in parallel with the operation switch 9, the contact 18a of the self-holding relay 18 is turned off after the operation switch 9 is turned off.
As a result, battery power can be supplied to the fan, the post-purge operation at the time of stoppage can be reliably performed, and a safe combustion device can be obtained.

An electrolytic capacitor 1 for delay is connected to an input side of a three-terminal regulator 15 for supplying power to the control circuit 2.
7, the three-terminal regulator 15 is operated for a predetermined time after the self-holding relay 18 is turned off and the contact 18a is opened, so that power can be supplied to the CPU 6 of the control circuit 2. Control circuit 2 when equipment operation is stopped
Overstable period can be eliminated, and a safe and reliable operation of stopping the combustion equipment can be performed.

The operation switch 9 and the self-holding relay 1
8 are connected in parallel with each other and operate independently of each other, so that a fuel system such as a pump and a fan / ignition system can be operated completely separated from each other, and an interlock function effective as a combustion device is provided. Can be prepared. From these facts, it is possible to reliably perform the fire extinguishing operation when the operation is stopped by applying the battery disconnection circuit 1 to a combustion device having a combustion system load such as a burner.

FIG. 3 is a circuit diagram showing another embodiment of the automatic battery disconnection circuit according to the present invention. The feature of the battery disconnection circuit 21 of this embodiment is that
The self-holding relay 18 has a contact 18b formed of a normally open contact other than the contact 18a, and is serially connected to the power line 14 for the pump. Other configurations are the same as those in the above-described embodiment, and therefore, are denoted by the same reference numerals, and detailed description thereof will be omitted.

The battery disconnecting circuit 21 of this embodiment
According to the embodiment, in addition to obtaining the same operation and effect as the above embodiment, the power supply line 14 for the pump is completely shut off at the same time as the self-holding relay 18 is turned off. In this case, even if the operation switch 9 is turned on, the supply of battery power to the pump is reliably shut off, and the operation and stop operation of the combustion equipment can be performed more safely and reliably.

The circuit configuration of the voltage detection circuit 3, the self-holding circuit 4, and the power supply circuit 5 in the above embodiment is merely an example, and various changes can be made without departing from the scope of the present invention. Needless to say. Further, in the above-described embodiments, a combustion device has been described as an example of a device. However, the present invention is not limited to this, and is applicable to any device that is operated by a battery, and in particular, is repeatedly operated and stopped. Can be.

[0037]

As described above in detail, according to the first aspect of the present invention, the battery can be automatically disconnected from the device when not in use, such as when the operation is stopped or when the storage is performed, and the battery is not artificially used. Removal and artificial operation of newly provided components are not required, and the usability of the device can be improved.

According to the second aspect of the present invention, in addition to the effects of the first aspect, a power supply capable of setting the control means to an operating state is supplied through both the operation switch and the self-holding means. In other words, even if the operation switch is off, the control unit can be operated as long as the self-holding unit is on, so that the delay stop operation of the device can be reliably performed.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect, even when the supply of the battery power to the power supply means is cut off,
The power supply means can be made operable for a predetermined time by the capacitor, and a more stable stopping operation of the device can be performed.

According to the fourth or fifth aspect of the present invention, in addition to the effects of the first to third aspects, the post-purge operation when the combustion equipment is stopped can be reliably performed, and the combustion equipment Safe fire extinguishing operation at the time of stoppage of
In particular, according to the invention as set forth in claim 5, there is an effect that the operation of stopping the pump becomes more reliable, and the operation of extinguishing the combustion section when the combustion equipment is stopped can be performed more safely.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment in which an automatic battery disconnection circuit according to the present invention is applied to a combustion device.

FIG. 2 is a timing chart showing the operation.

FIG. 3 is a circuit diagram showing another embodiment of the automatic battery disconnection circuit according to the present invention.

FIG. 4 is a connection diagram showing a connection state of a conventional battery to a load.

FIG. 5 is a connection diagram showing another connection state of a conventional battery to a load.

[Explanation of symbols]

 1 Automatic battery disconnection circuit 2 Control circuit 3 Voltage detection circuit 4 Self Holding circuit 5 Power supply circuit 6 CPU 9 Operation switch 11 Battery 12 and 16 ····· Diodes 13 and 14 ····· Power supply line 15 ······························································ Relay 18a, 18b ··· Contact 19 ······ Transistor

Claims (5)

[Claims] 1. An operation switch serving also as a power switch connected to a battery, self-holding means for holding a predetermined state by operating, a detection means for detecting an operation state of the operation switch, and the self-holding means. And a power supply unit for supplying power to the control unit. The control unit operates the self-holding unit based on a detection result of the detection unit, thereby controlling each load from the battery. An automatic battery disconnection circuit, characterized in that the power supply to the battery is cut off and the battery is disconnected from each load. 2. The automatic battery disconnecting circuit according to claim 1, wherein said power supply means is configured to be able to supply battery power via both said operation switch and said self-holding means. 3. The power supply means is connected to a three-terminal regulator and an input side of the three-terminal regulator, and delays stoppage of the three-terminal regulator when power supply from the battery to the power supply means is cut off. 3. The automatic battery disconnection circuit according to claim 1, further comprising a capacitor. 4. The self-holding means has a self-holding relay, a normally open contact of the self-holding relay is connected in parallel with an operation switch, and a fan and an ignition transformer of a combustion device are connected to the contact. The automatic battery disconnection circuit according to any one of claims 1 to 3, wherein a pump of the combustion equipment is connected to the switch. 5. The automatic battery disconnection circuit according to claim 4, wherein another normally open contact of said self-holding relay is connected between said operation switch and said pump.