JPH0326027B2 - - 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 that are turned on and off intermittently by signals from the electronic circuit section 1.
Power is supplied from the output side of power switch SW _M via SWc. This intermittent switch SWc is sometimes inserted on the output side of the stabilized power supply 3, and some intermittent loads 2, such as heaters, are directly connected to the output side of the intermittent switch SWc without going through the stabilized power supply 3. Sometimes it is done. In addition, the electronic circuit section 1 and the stabilized power supply 3 are connected to the commercial power supply AC100V or
Usually, 200V is converted to DC5V, 12V, 24V, etc.

When an ON command signal is sent to the intermittent switch SWc 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 shifts from a standby state to an operating state. do. When the intermittent switch SWc 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 Ic ₁ of the electrical equipment M during standby <<
The intermittent load 2 current Ip ₁ is set, and the input current I _M1 of the electrical equipment M increases rapidly when the intermittent switch SWc is turned on, and its peak value may reach 30A or more, so the input side electric wire A thick wire was required to take into account the current when the intermittent switch SWc was turned on. Furthermore, when the power supply impedance is high, a sharp voltage drop may occur, causing surrounding electrical equipment to malfunction. Furthermore, even though the stabilized power supply 3 operates only intermittently, the load current of the intermittent load 2
It is necessary to prepare a large-capacity device that can withstand IP ₁ , and furthermore, it cannot be used with a 15A branch circuit in general 100V indoor wiring specified by electrical equipment technical standards and extension regulations, so it is a 200V-only device. The drawback was that it 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.),
Reduces and flattens the input current peak value of electrical equipment with circuit parts that are turned on and off intermittently, such as automatic control equipment (industrial robots) in factories, to below the conventional input current peak value. To provide an electric device which can be operated with a small capacity power supply device and can charge a storage battery when the device is not in use.

[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 power switch.
SW _M ′, a first circuit section connected to the commercial power source E via the on-side contact a of the power switch SW _M ′, and the commercial power source E via the off-side contact b of the power switch SW _M ′. A charging circuit section 4 connected to E,
A storage battery 5 charged by this charging circuit section 4;
and a second circuit section connected to the storage battery 5 through an intermittent switch SWc that is turned on and off intermittently during operation of the first circuit section, and the output capacity of the charging circuit section 4 is connected to the second circuit section. The storage battery 5 is charged when the power switch SW _M ' is turned off when neither the first nor the second circuit section is in operation. be.

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

Embodiment 1 FIG. 5 shows a circuit block diagram of this embodiment. In this embodiment, the commercial power source E is connected to the electronic circuit, which is the first circuit section, through the on-side contact a of the power switch SW _M '. At the same time, a charging completion switch SW ₁ is connected between the on-side contact a of the power switch SW _M ' and the electronic circuit section 1, if necessary. In addition, the charging circuit section 4 is turned on by the power switch.
Connect to the commercial power supply E via the off-side contact b of SW _M ', and set the overcharge prevention switch as necessary.
SW ₂ is inserted between the off-side contact b of the power switch SW _M ′ and the charging circuit section 4 . A storage battery 5 is connected to the output side of the charging circuit section 4, and an intermittent switch controlled by the electronic circuit section 1 is connected to the storage battery 5.
An intermittent load 2, which is a second circuit section, is connected to the storage battery 5 via SWc. Further, the storage battery 5 is connected to a circuit in the electronic circuit section 1 that requires power failure compensation via a power failure compensation switch SW ₃ and a diode D for preventing backflow, as required. The stabilized power source 3 in the conventional example shown in FIG. 1 is therefore unnecessary because the charging circuit section 4 and the storage battery 5 fulfill their functions. Of course, a power switch for the electrical equipment M may be separately provided on the input side of the power switch SW _M '.

Next, the operation of this embodiment will be explained. First, when the power switch SW _M ' is on the on side contact a, the electrical equipment M
is a normal operating state, and when the contact b is on the off side, the electrical equipment M stops operating and the storage battery 5 is charged via the charging circuit section 4.

For example, when operating electrical equipment M during work hours, such as during the day, the power switch must be turned on.
SW _M ' is set to the on-side contact a, and set to the off-side contact b when the electrical equipment M is not used during non-working hours such as at night.

Therefore, the power switch SW _M ' is set to the off-side contact b. For example, the storage battery 5 is charged by the output of the charging circuit section 4 during the night, and the power switch SW _M ' is turned on at the start of work in the morning when charging is completed. When the on-side contact a is set, the electronic circuit section 1 is activated and the electric device M enters a standby state. In this standby state, when an external signal such as an on signal from a push button switch or a telephone line signal is input to the electronic circuit section 1 and the intermittent switch SWc is turned on, power is supplied to the intermittent load 2 from the storage battery 5. Here, the electrical equipment M of the present invention charges the storage battery 5 with the power switch SW _M ' set to the off-side contact b, and operates with the power switch SW M' set to the on-side contact a, and the input current during this operation is I _M1 is the load current of electronic circuit section 1
This input current I _M1 is sufficiently lower than that of the conventional example shown in FIG. ₁ , where the input current I _M1 is Ic ₁ +Ip ₁ . In addition, in the charging state where the power switch SW _M ' is set to the off-side contact b, a charging current Ip ₁ is flowing to charge the storage battery 5, and this charging current
By making Ip ₁ less than the conventional Ic ₁ +Ip ₁ , the input current of the electrical equipment M can be reduced compared to the input current I _M1 of the conventional example shown in FIG. In other words, the input current of the electrical equipment M can be adjusted freely within the range that satisfies the condition of electric capacity of the charging circuit section 4 < electric capacity of the intermittent load 2 + electric capacity of the electronic circuit section 1.
This means that I _M1 can be set.

Therefore, the input current I _M1 of the electrical device M is reduced to a level lower than the conventional input current and is flattened.

FIG. 6 shows the state of the input current I _M1 of _the electrical equipment of the present invention when the overcharge prevention switch SW ₂ is provided. Indicates the point in time when the overcharge prevention switch SW ₂ is turned off, and the point in time t ₁ is the point in time when the power switch SW 2 is turned off.
A time point t2 indicates the time point when SW _M ' is set to the on-side contact a, and a time point _t2 indicates a time point when the power switch SW _M ' is set to the off-side contact b. The overcharge prevention switch _SW2 is turned off when an appropriate known detection means detects that the amount of charge has increased.

Figure 7 shows that when the intermittent switch SWc is turned off, the capacity of the storage battery 5 remains unchanged, and when it is turned on again, the capacity of the storage battery 5 remains unchanged.
This repeated operation in which the capacity of the storage battery 5 decreases continues until the power switch SW _M ' is set to the OFF side contact b, and when the power switch SW M ' is set to the OFF side, the storage battery 5 is charged, so the capacity of the storage battery 5 increases. It shows that we will continue to do so. Time t ₀ in the figure indicates the time when overcharge prevention switch SW ₂ is activated and charging is stopped.

Thus, in the present invention, the storage battery 5 is charged when the electrical equipment M is turned off, and the intermittent load 2 is charged when the electrical equipment M is turned on.
Power is supplied from the storage battery 5 to reduce the input current I _M1 ,
It can be flattened.

Regarding the summary of the electrical equipment M of the present invention, for example, setting the power switch SW _M ' to the on-side contact a is not limited to daytime, and setting the power switch SW M' to the off-side contact b is not limited to nighttime. It may be switched between the on side and the off side each time the intermittent operation is performed.
Even once during a long period of time, such as at night, is fine; the key is on the on-side,
Switching to the off side can be selected arbitrarily. Also intermittent switch SWc and power switch
The operations of SW _M ′ may be linked. Furthermore, in this embodiment, the electronic circuit section 1 is configured to operate after the charge completion switch SW ₁ is turned on, so the electronic circuit section 1 does not operate until the charge completion switch SW ₁ is turned on. intermittent switch
Even if a signal to turn on SWc is received, it is not accepted, so intermittent load 2 will not be turned on. In other words, malfunction of the intermittent load 2 due to insufficient charge of the storage battery 5 can be prevented. In addition, in this embodiment, the power failure compensation switch SW ₃ is turned on at the time of a power failure of the commercial power source E, and the storage battery 5 compensates for the power supply of the electronic circuit section 1, so that the electric equipment M can be operated only during the effective time of the storage battery 5. It can also be done.

[Effects of the Invention] The present invention is configured as described above, and includes a power switch, a first circuit section connected to a commercial power supply via an on-side contact of the power switch, and an off-side contact of the power switch. A charging circuit unit is connected to a commercial power supply via a charging circuit unit, a storage battery is charged by the charging circuit unit, and a storage battery is connected to the storage battery via an intermittent switch that is turned on and off intermittently when the first circuit unit is operated. and a second circuit section, the output capacity of the charging circuit section is set smaller than the load capacity of the second circuit section, and both the first and second circuit sections are not operating. Since the storage battery is charged when the power switch is turned off, the storage battery can be charged while the power switch is turned on the off-side contact, and it is possible to charge the storage battery while the power switch is turned on the on-side contact. Even if the second circuit section operates, the load current can be borne by the storage battery, so the input current of electrical equipment becomes a flattened current, which has the effect of making the input wire thinner, especially when the power switch is turned off. Since the storage battery is charged while power is being applied to the side contact, it is possible to make the input current more flat and uniform, and there is no sudden drop in power supply voltage, which prevents surrounding electrical equipment from malfunctioning. Furthermore, the surge and noise generated when the intermittent switch is turned on and off is 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 used in the past is no longer required. In addition, it has the effect of reducing high frequency noise sources, and increasing versatility by allowing the use of devices that could not be used with conventional 100V15A branches.Furthermore, the electric capacity of the charging circuit section is also small, making it possible to reduce the source of high-frequency noise. It has the advantage of being smaller, lighter, and cheaper than a stabilized power source.

Even during the day, if the power switch is set to the off-side contact when the device is not in use, such as during a lunch break, the power can be saved and the capacity of the storage battery can be further reduced.

[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 an embodiment of the present invention. The block diagrams, FIGS. 6 and 7 are explanatory diagrams of the same operation as above, where 1 is an electronic circuit section, 2 is an intermittent load, and 4 is an explanatory diagram of the same operation.
5 is a charging circuit, 5 is a storage battery, SW _M ' is a power switch, and SWc 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, the first circuit section being connected to a commercial power source via a power switch and an on-side contact of the power switch; A charging circuit unit connected to a commercial power supply via the off-side contacts of the power switch, a storage battery charged by the charging circuit unit, and an intermittent switch that is turned on and off intermittently when the first circuit unit is operated. and a second circuit section connected to the storage battery through the charging circuit section, the output capacity of the charging circuit section is set to be smaller than the load capacity of the second circuit section, and An electrical device characterized in that a storage battery is charged when the power switch is turned off when none of the devices are in operation.