JPH0432623B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to electrical equipment such as copying machines.

[Background technology] Electrical equipment for office processing (facsimile machines, copying machines, word processors, etc.) and automatic control equipment in factories (industrial robots) have electronic circuits that are constantly in operation and electronic circuits that are turned on and off intermittently. It generally consists of loads such as motors, lamps, and heaters (thermal heads), and the input current seen from the input side of the device is not constant but has a complex waveform that includes peak values. .

FIGS. 1 and 2 are conventional examples shown in order to explain the situation during this period in detail. That is, commercial power supply E
The electronic circuit section 1 for device control is connected to the electric device M via the power switch SW _M , and the electric device M is in a standby state. On the other hand, intermittent loads 2 such as motors, lamps, and heaters (thermal heads) and stabilized power supplies 3 such as switching regulators are intermittent switches SW _C that are turned on and off intermittently by signals from the electronic circuit section 1.
Power is supplied from the output side of the power switch SW _M via. This intermittent switch SW _C is the stabilized power supply 3
Some intermittent loads 2, such as heaters, are inserted into the output side of the stabilized power supply 3.
Sometimes it is connected directly to the output side of the intermittent switch SW _C without going through it. In addition, the electronic circuit section 1 and the stabilized power supply 3 are connected to the commercial power supply AC100V or 200V.
It is usually converted to DC5V, 12V, 24V, etc.

When an ON command signal is sent to the intermittent switch SW _C by an external signal, such as an ON signal from a push button switch or an ON signal received from a telephone line, the intermittent load 2 operates, and the electrical equipment M changes from a standby state to an operating state. Transition. When the intermittent switch SW _C is turned off, the intermittent load 2 is turned off and enters the standby state again. The input current of the electrical equipment M at this time is shown in FIG.
In other words, the input current I _C1 of the electrical equipment M during standby << the intermittent load 2 current I _P1 , and the input current I _M1 of the electrical equipment M increases rapidly even when the intermittent switch SW _C is turned on, and reaches its peak. Since the value can reach 30A or more, the input wire needed to be thick enough to handle the current when the intermittent switch SW _C was turned on. Furthermore, when the power supply impedance is high, a sharp voltage drop may occur, causing surrounding electrical equipment to malfunction. In addition, the stabilized power supply 3 must have a large capacity that can withstand the load 2 current I _P1 of the intermittent load 2 even though it only operates intermittently, and it must also have a large capacity that can withstand the load 2 current I P1 of the intermittent load 2. The drawback was that it could not be used with a 15A branch circuit in general 100V indoor wiring, so it became a 200V-only device and lacked versatility.

By the way, as with the electrical equipment of the present invention, an electrical equipment including a charging circuit unit connected to a commercial power source, a storage battery charged by the charging circuit unit, and a circuit unit connected to the storage battery is shown in FIG. 2. Description of the Related Art Conventionally, there has been an emergency power supply device as shown in FIG.

In other words, in the device shown in Fig. 3, when the commercial power supply E is energized, the storage battery 5' is charged through the charging circuit section 4', and when a power outage occurs, the relay RY detects the power outage and the relay contact r is connected to the intermittent load 2' side. Then, power is supplied from the storage battery 5' to the intermittent load 2'. In this case, the charging capacity of the charging circuit section 4' may be smaller than the capacity of the intermittent load 2', but the operation of the intermittent load 2' is limited to when the charging circuit section 4' does not operate due to a power outage, etc. The circuit section 4' is not connected to the intermittent load 2' during operation, and the commercial power supply E
This is fundamentally different from electrical equipment that operates under energized conditions. Furthermore, the device shown in Fig. 4 uses the so-called floating method in which the intermittent load 2' operates both when the commercial power source E is energized and during a power outage, but in this case, the intermittent load 2' is operated at all times. Therefore, the capacity of the charging circuit section 4' is the sum of the capacity to operate the load and the capacity to charge the storage battery 5', and naturally the capacity of the charging circuit section 4'>intermittent load 2', and the input current cannot be flattened or made uniform. In addition, in both FIGS. 3 and 4, the intermittent load 2' is generally a continuously energized load, and does not have a circuit section that operates intermittently, but is an electrical device of the present invention that flattens the input current. It was fundamentally different.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and its purpose is to provide electrical equipment for office processing (facsimile machines, copying machines, word processors, etc.),
The peak value of the input current of electrical equipment with circuit parts that are turned on and off intermittently, such as automatic control equipment (industrial robots) in factories, is reduced to less than the peak value of the conventional input current, and the capacitance is flattened. To provide an electric device which can be operated with a power supply device, can switch charging current between when the device is in operation and when the device is not in operation, and can prevent overcharging of a storage battery when the device is not in operation.

[Disclosure of the Invention] The present invention is an electrical device connected to a commercial power source E and having first and second circuit sections, which includes a storage battery 5,
a power switch SW _M ; a first circuit section connected to a commercial power source E via the power switch SW _M ;
It is composed of a charging circuit 4a, a second charging circuit 4b,
Operation of the charging circuit section 4 that charges the storage battery 5 in the first charging circuit 4a when the power switch SW _M is turned on and in the second charging circuit 4b when the power switch SW _M is turned off, and the operation of the first circuit section. and a second circuit section connected to the storage battery 5 via an intermittent switch SW _C that is turned on and off intermittently at times, so that the output capacity of the charging circuit section 4 is lower than the load capacity of the second circuit section. It is characterized by being set small.

The electrical equipment of the present invention will be explained below using examples.

First, before describing embodiments, an example that is the basis of the present invention will be described.

FIG. 5 shows a circuit block diagram of a basic example, and in this example, an electronic circuit section 1 for device control, which is a first circuit section, is connected from a commercial power source E via a power switch SW _M. This is the same as the conventional example shown in FIG. 1, except that a charging completion switch _SW1 is connected between the output side of the power switch _SWM and the electronic circuit section 1 as required. Further, a charging circuit section 4 is connected to the commercial power source E via an overcharge prevention switch _SW2 provided as necessary. A storage battery 5 is connected to the output side of the charging circuit section 4, and an intermittent load 2, which is a second circuit section, is connected to the storage battery 5 via an intermittent switch SW _C controlled by the electronic circuit section 1. . Further, a power failure compensation switch SW ₃ is connected between the positive terminal of the storage battery 5 and a circuit requiring power failure compensation in the electronic circuit section 1 via a backflow prevention diode D as required.

In the illustrated basic electric device M, the stabilized power source 3 shown in the conventional example is not used because the charging circuit section 4 and the storage battery 5 perform their functions. Here, the charging circuit section 4 has an overcharge detection function of the storage battery 5 and a charge completion detection function, and controls a charge completion switch SW ₁ and an overcharge prevention switch SW ₂ provided as necessary. Further, the power failure compensation switch _SW3 is provided with a power failure detection means for detecting a power failure of an appropriate commercial power source E, and is turned on when the means detects a power failure. Furthermore, another power switch may be provided on the input side of the electrical equipment M in addition to the power switch SW _M.

Next, the operation of the basic example will be explained. First, when the power switch SW _M is turned on, the commercial power E is supplied to the electronic circuit section 1 through the power switch SW _M and the charging completion switch.
Powered via SW ₁ . On the other hand, the power switch
Overcharge prevention switch regardless of whether SW _M is on or off.
Power is constantly supplied to the charging circuit section 4 from the commercial power source E via SW ₂ , and the storage battery 5 is charged by the output of the charging circuit section 4. Then, by turning on the power switch SW _M , the electric device M enters a standby state. When an external signal, such as a turn-on signal from a push button switch, is input to the electronic circuit section 1 in this standby state, the intermittent switch SW _C is turned on under the control of the electronic circuit section 1, and a current I _L1 flows through the intermittent load 2. At this time, the current I _L1 flowing through the intermittent load 2 is a combination of the discharge current I _B1 from the storage battery 5 and the supply I _ch1 from the charging circuit section 4, as shown in FIG. Now, when the above-mentioned external signal is released and the intermittent switch SW _C is turned off, a charging current I _ch1 flows to the storage battery 5 and charges the discharged amount. FIG. 8 shows this state. In other words, in the basic example, the storage battery 5 and the charging circuit section 4 share the power consumed by one operation of the intermittent load 2.

Here, the relationship between the intermittent load 2 capacity, the storage battery 5 capacity, and the output capacity of the charging circuit section 4 is as follows: Intermittent load 2 capacity ≦ storage battery 5 capacity + output capacity of the charging circuit section 4 2 Output capacity of the charging circuit section 4 < intermittent By setting the conditions to satisfy the two points of load capacity,
From the above condition 1, the power supply to the intermittent load 2 can be sufficiently covered by the storage battery 5 and the output of the charging circuit section 4, and from the above condition 2, the input current of the charging circuit section 4 is equivalent to the current of the intermittent load 2. (The value converted to the primary side) A smaller value is sufficient, and as described above, I _L1 = I _ch1 + I _B1 .

Then, while the intermittent load 2 is off, the storage battery 5 is charged with the output current I _ch1 of the charging circuit section 4, and when the intermittent load 2 is on, I _ch1 + I _B1 forms the load current I _L1 , and the charging circuit section 4 If the efficiency of the charging circuit 4 is ignored, the total input current I _P1 is the output current of the charging circuit 4.
It never exceeds the equivalent of I _ch1 (the value converted to the primary side). Therefore, the peak current I _P1 during operation of the intermittent load 2 is supplied by either the storage battery 5 or a part of the current of the intermittent load 2, and the total input current I _M1 of the electrical equipment M is flattened and becomes the sixth peak current I P1. As shown in the figure, a large current as shown in FIG. 2 does not occur.

Incidentally, FIG. 7 shows that a constant current is output from the charging circuit section 4 regardless of whether the intermittent load 2 is on or off. Further, the on time and off time of the intermittent load 2 are different, and although there are cases where the storage battery 5 is completely discharged after one use, there are also cases where a residual amount remains. Therefore, even if the capacity of the storage battery 5 is selected so that there is at least some remaining charge, even if the capacity of the storage battery 5 is fully charged when the power switch SW _M is turned on as shown in FIG. is discharged, and the capacity of the storage battery 5 gradually decreases. Therefore, when actually setting the capacity of the storage battery 5 and the capacity of the charging circuit section 4, it is necessary to consider the on/off time ratio of the intermittent load 2 and select them appropriately. Further, supplementary charging of the storage battery 5 can be performed when the power switch SW _M of the electric device M is turned off (for example, at night). In this way, the above-mentioned input current I _M1 of the basic example electric device M, which charges even when the electric device M is not in use, has a theoretical value as shown in FIG. A part of the operating power of the intermittent load 2 is supplied by the storage battery 5 charged during the off period of the electrical equipment M (for example, at night), and the peak value of the input current I _M1 is the average input current I _AVE It can be set as below.

Also, during periods when electrical equipment M is used, such as during the day, the same drop as described above can be expected depending on the frequency of use, and the storage battery 5 for intermittent load 2 can be expected to
Since power is supplied from the charging circuit section 4, the input current I _M1 of the electric device M does not have a very large peak value.

Now, there is a charging completion switch that can be installed as needed.
SW ₁ remains off until the storage battery 5 is charged to a certain amount or more, and turns on when a certain amount of charge is detected, and remains in the off state until the electronic circuit section 1 receives power from the commercial power source E and operates. This is to prevent the intermittent load 2 from being turned on before charging is completed by not accepting external signals even if they are input. In other words, malfunction of the intermittent load 2 due to insufficient charge of the storage battery 5 can be prevented. In addition, the overcharge prevention switch SW ₂ is turned off when the intermittent switch SW _C is off for a long time or when the on time is short, that is, when the amount of charge is too large compared to the amount of discharge, the overcharge prevention switch SW 2 is turned off and the storage battery 5 is damaged due to overcharging. This is to prevent Also, power outage compensation switch
SW ₃ is turned on when the commercial power source E is out of power, and compensates by supplying power to the electronic circuit section 1 from the storage battery 5 for the effective time of the storage battery 5, thereby enabling the operation of the electrical equipment M.

In the above basic example, the storage battery 5 is charged with the same charging output of the charging circuit section 4 both when the device is operating and when the device is not operating, and when performing rapid charging etc., a large charging current is applied to the storage battery 5 even when the device is not operating. flow, storage battery 5
may have a negative impact on.

Therefore, the present invention is an improvement based on the above basic example, and FIG. 12 shows an embodiment thereof. In this embodiment, two charging circuits 4a and 4b are provided to turn on the power switch SW _M. , when the power switch SW _M is turned on to the on-side contact a, the charging circuit 4a is connected to the commercial power supply E via the on-side contact a and the overcharge prevention switch SW ₂₁ . At the same time, the electronic circuit section 1 is connected to the commercial power source E, and the operation is exactly the same as that of the basic example shown in FIG.

Next, when the power switch SW _M is connected to the off-side contact b (for example, when the device is not operating at night), the overcharge prevention switch SW ₂₂ charges the storage battery 4 using the charging circuit 4b, which has a different capacity from the normal operation described above. That's what I do. Here, by making the charging current of the storage battery 5 different during operation and non-operation, and performing gentle charging during non-operation, it is possible to protect the storage battery 5 from overcharging due to rapid charging. Furthermore, the power switch
By linking the on/off operation of SW _M with the intermittent switch SW _C , the rapid charging state can be set only during operation, and the storage battery 5 can be protected in the same way as described above.

[Effects of the Invention] The present invention includes a storage battery, a power switch, a first circuit unit connected to a commercial power source via the power switch, a first charging circuit, and a second charging circuit, A charging circuit unit that charges the storage battery with a first charging circuit when the power switch is on and a second charging circuit when the power switch is off; A second battery is connected to the storage battery via an intermittent switch.
Since the output capacity of the charging circuit section is set to be smaller than the load capacity of the second circuit section, the storage battery can be constantly charged regardless of whether the power switch is on or off. And,
Since the load current during operation of the second circuit section can be borne by the storage battery, a very large peak value does not appear in the input current of the electrical equipment, and moreover, the input current for charging the storage battery to the charging circuit section and the second Since the required input current value is the sum of the input currents of the circuit section 1, it becomes a flattened current value, and there is no need to consider the peak value as described above, so the input current value is This has the effect of making the electric wire thinner, and since the storage battery is constantly charged as described above, even if the capacity of the storage battery decreases due to the operation of the second circuit section, it can be compensated for when the second circuit section is not operating. Can be charged,
It is possible to prevent capacity shortages when using electrical equipment, and it also eliminates sudden drops in power supply voltage, prevents surrounding electrical equipment from malfunctioning, and prevents surges that occur when turning on and off intermittent switches. and noise are absorbed by the storage battery, reducing the need for noise countermeasures.Furthermore, by selecting an appropriate voltage for the storage battery, the stabilizing power supply that was conventionally used can be eliminated, and high-frequency noise sources can be reduced. Furthermore, it has the effect of increasing versatility as it can be used with devices that could not be used with conventional 100V15A branches.Furthermore, since the electric capacity of the charging circuit part is also small, it is smaller, lighter, and cheaper than conventional stabilized power supplies. Moreover, it is composed of a first charging circuit and a second charging circuit, and the first charging circuit charges the storage battery when the power switch is turned on, and the second charging circuit charges the storage battery when the power switch is turned off. Since it is equipped with a charging circuit section for charging, it is possible to use the first charging circuit that outputs a large current when the device is operating, and the second charging circuit that outputs a small current when the device is not operating.
Therefore, rapid charging can be performed when the battery is in operation, and charging can be performed while preventing overcharging due to rapid charging when the battery is not in operation.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of a conventional example, FIG. 2 is an explanatory diagram of the same operation as above, FIGS. 3 and 4 are circuit block diagrams of different conventional examples, and FIG. 5 is a circuit of a basic example of the present invention. The block diagrams, FIGS. 6 to 11 are explanatory diagrams of the same operation as above, and FIG. 12 is a circuit block diagram of an embodiment of the present invention, in which 1 is an electronic circuit section, 2 is an intermittent load, and 4
4a and 4b are charging circuits, 5 is a storage battery, SW _M is a power switch, and SW _C is an intermittent switch.

Claims (1)

[Claims] 1 An electrical device connected to a commercial power source and having a first and a second circuit section, which includes a storage battery, a power switch, a first circuit section connected to the commercial power source via the power switch, and a first circuit section connected to a commercial power source. and a second charging circuit, which charges the storage battery with the first charging circuit when the power switch is turned on and with the second charging circuit when the power switch is turned off; and a second circuit section connected to the storage battery via an intermittent switch that is turned on and off intermittently when the circuit section is in operation, and the output capacity of the charging circuit section is made smaller than the load capacity of the second circuit section. An electrical device characterized by having a small size.