JPH0642768B2 - Electrical equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric device such as a copying machine.

[Background Art] Electric devices for office work (facsimile machines, copiers, word processors, etc.) and automatic control devices (industrial robots) in factories are electronic circuits that are always in operation, and motors that are turned on and off intermittently. It is generally composed of a load such as a lamp, a heater, and a heater (thermal head), and the input current viewed from the input side of the device is not constant but has a complicated waveform including a peak value.

FIG. 1 and FIG. 2 are conventional examples shown in order to explain the situation during this period in detail. That is, the electronic circuit section 1 for device control is connected from the commercial power source E via the power switch SW _M , and the electric device M is in a standby state. On the other hand, motors and lamps,
The intermittent load 2 such as a heater (thermal head) and the stabilizing power supply 3 such as a switching regulator are the electronic circuit section 1
Switch SW that turns on and off intermittently according to the signal of
Power is supplied from the output side of the power switch SW _M via _C. This intermittent switch SW _C may be inserted on the output side of the stabilizing power supply 3, and some of the intermittent loads 2, for example, heaters, etc. do not directly go through the stabilizing power supply 3 but directly on the output side of the intermittent switch SW _C. Sometimes connected to. Further, the electronic circuit section 1 and the stabilizing power source 3 are AC100 which is a commercial power source.
It is usually converted from V or 200V to DC 5V, 12V, 24V or the like.

Therefore, an intermittent switch SW is activated by an external signal, for example, a push button switch or a telephone line reception.
_When the ON command signal is sent to _C , the intermittent load 2 operates and the electric device M shifts from the standby state to the operating state. When the intermittent switch SW _C is turned off, the intermittent load 2 is turned off and the standby state is resumed. The input current of the electric device M at this time is
Shown in the figure. That is, the input current I _{C1 of the} electric device M during standby is <<
It has an intermittent load 2 current I _P1, and the input current I _M1 of the electric device M rapidly increases when the intermittent switch SW _C is turned on, and its peak value may reach 30 A or more. Required a thick wire in consideration of the current when the intermittent switch SW _C was turned on. In addition, when the power source impedance is high, a sharp voltage drop may occur, causing malfunction of surrounding electrical equipment. In addition, the stabilized power supply 3 must have a large capacity that can withstand the load current I _P1 of the intermittent load 2 even though it operates only intermittently. There is a defect that it becomes a 200V dedicated device and lacks versatility because it cannot be used in the 15A branch circuit in the 100V indoor wiring.

By the way, FIG. 3 shows an electric device 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, like the electric device of the present invention. Conventionally, there is an emergency power supply device as shown in FIG.

That is, in the apparatus shown in FIG. 3, when the commercial power source E is energized, the storage battery 4'is charged through the charging circuit section 5 ', and when a power failure occurs, the relay RY detects the power failure and the relay contact r is on the intermittent load 2'side. And the electric power is supplied from the storage battery 4'to the intermittent load 2 '. In this case, the charging capacity of the charging circuit section 5'is smaller than the capacity of the intermittent load 2 ', but the operation of the intermittent load 2'is limited when the charging circuit section 5'does not operate due to a power failure or the like, and the charging It is not connected to the intermittent load 2'during the operation of the circuit portion 5 ', and is fundamentally different from the electric device that operates under the energization of the commercial power source E.
The device shown in FIG. 4 is a so-called floating system in which the intermittent load 2'is operated both when the commercial power source E is energized and during a power failure. In this case, the intermittent load 2'is always operated. The capacity of the charging circuit section 5'is the sum of the capacity for operating the load and the capacity for charging the storage battery 4 ', and naturally, the charging circuit section 5'> intermittent load 2 '.
Therefore, the input current cannot be flattened or made uniform. Also, in both FIGS. 3 and 4, the intermittent load 2'is generally a continuous energizing load, and does not have a circuit section which operates intermittently, but the electric device of the present invention for flattening the input current. Was basically different from.

[Object of the Invention] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide electrical equipment for office processing (facsimile, copying machine, word processor, etc.) and automatic control equipment in a factory ( (Industrial robots, etc.) Intermittently turns on and off the electrical equipment that has a circuit part that has an input current peak value that is less than or equal to the conventional input current peak value, and is flattened to operate with a small-capacity power supply device. It is to provide electric equipment that makes possible.

[Disclosure of Invention]

In order to achieve the above-mentioned object, the present invention is an electric device connected to a commercial power source and having first and second circuit parts,
Charging for charging a storage battery, a power switch, a first circuit section connected to a commercial power source via the power switch, the commercial power source via the power switch when the power switch is turned on, and charging the storage battery A second circuit section connected to the storage battery via an intermittent switch that is intermittently turned on and off when the first circuit section is operating, and the output capacity of the charging circuit section is set to the second circuit section. It is smaller than the load capacity of the circuit section, and the output current of the charging circuit section and the discharge current from the storage battery are supplied to the second circuit section when the second circuit section is turned on. To do.

Hereinafter, the electric device of the present invention will be described with reference to examples.

Embodiment 1 FIG. 5 shows a circuit block diagram of this embodiment.
This embodiment is the same as the conventional example of FIG. 1 in that the electronic circuit section 1 as the first circuit section is connected from the commercial power source E via the power switch SW _M , but the charging completion switch SW ₁ is It is connected between the output side of the power switch SW _M and the electronic circuit section 1. Further, the commercial power source E is connected to a charging circuit section 5 via a power switch SW _M and an overcharge prevention switch SW ₂ provided as necessary, and the charging circuit section 5 is provided on the output side of the charging circuit section 5. A storage battery 4 that is charged with the output of 5 is connected to the storage battery 4, and an intermittent load 2 that is a second circuit portion is connected to the storage battery 4 via an intermittent switch SW _C that is turned on and off under the control of the electronic circuit portion 1. It is connected. The switches are connected through a backflow prevention diode D between the circuits requiring power failure compensation positive electrode and the electronic circuit unit 1 of the battery 4 a blackout compensation switch SW ₃ in Naozu, the blackout compensation switch SW ₃ is connected as needed. Thus, the stabilized power supply 3 shown in the conventional example
Is not used because the charging circuit unit 5 and the storage battery 4 fulfill their functions. Here, the charging circuit unit 5 has an overcharge detection function and a charge completion detection function for the storage battery 4, and controls the charge completion switch SW ₁ and the overcharge prevention switch SW ₂ which are provided as necessary. The power failure compensating switch SW ₃ is provided with a power failure detecting means for detecting an appropriate power failure of the commercial power source E, and is turned on when the means detects a power failure.

Next, the operation of this embodiment will be described. First, the power switch SW
_{When M} is turned on, if the storage battery 4 is in a charged state of a certain amount, power is supplied from the commercial power source E to the electronic circuit section 1 via the power switch SW _M and the charging completion switch SW ₁ , and the overcharge prevention switch SW ₂ Power is supplied to the charging circuit unit 5 via the. Here, the output of the charging circuit unit 5 including a constant current output type charging circuit or the like charges the storage battery 4. This state is the standby state of the electric device M. In this standby state, an external signal, for example, an ON signal by a push button switch is sent to the electronic circuit section 1.
When it is input to, the intermittent switch SW _C is turned on, and the current I _L1 flows through the intermittent load 2. At this time, the current I _L1 flowing through the intermittent load 2 is the discharge current I from the storage battery 4 as shown in FIG.
_B1 and the supply amount Ich ₁ from the charging circuit portion 5 is made to have been synthesized. Now, when the above-mentioned external signal is released and the intermittent switch SW _C is turned off, the charging current Ich ₁ flows to the storage battery 4 to charge the discharged portion. FIG. 8 shows this state. That is, in the present embodiment, the amount of the intermittent load 2 used once is basically replenished each time, and the following description assumes that the storage battery 4 is always restored to a substantially fully charged state.

Here, the relational condition between the intermittent load 2 capacity, the storage battery 4 capacity and the output capacity of the charging circuit unit 5 is 1) intermittent load 2 capacity ≤ the storage battery 4 capacity + the output capacity of the charging circuit unit 5 2) the output capacity of the charging circuit unit 5 <By setting the condition satisfying the two points of the intermittent load 2 capacity, the power supply to the intermittent load 2 can be sufficiently covered by the output of the storage battery 4 and the charging circuit unit 5 from the condition of 1) above. From the condition 2), the input current of the charging circuit unit 5 can be smaller than the current equivalent to the intermittent load 2 (value converted on the primary side), and I _L1 = Ich ₁ + I _{B1 as} described above.

Therefore, while the intermittent load 2 is off, the output current of the charging circuit unit 5
Ich ₁ charges the storage battery 4, and when the intermittent load 2 is on, Ich ₁
+ I _B1 forms the load current I _L1, and the total input current I _P1 to the charging circuit unit 5 is equivalent to the output current Ich ₁ of the charging circuit unit 5 (primary conversion value) or more if the efficiency of the charging circuit unit 5 is ignored. It never becomes. Therefore, the peak current I _P1 during the operation of the intermittent load 2 is that part of the current of the intermittent load 2 is supplied from the storage battery 4, and the total input current of the electric device M is
I _M1 is flattened as shown in FIG. 6 and does not have the large current as shown in FIG.

Note that FIG. 7 shows that a constant current is output from the charging circuit section 5 regardless of whether the intermittent load 2 is on or off. In addition, the on-time and off-time of the intermittent load 2 are mixed, and the storage battery 4 may be entirely discharged by one use, but the remaining amount may remain. So the remaining amount when on the start of the power switch SW _M as Figure 10 When you select the capacity of the storage battery 4 so that at least there is a battery 4
Even if the capacity is about half, the amount of charge increases more than the amount of use over time, and the storage battery 4 is finally fully charged.
Therefore, when actually setting the capacity of the storage battery 4 and the capacity of the charging circuit unit 5, it is necessary to appropriately select in consideration of the on / off time ratio. However, in the present invention, the input current of the electric device M described above is selected. The theoretical value of I _M1 is as shown in FIG. 11 when the efficiency of the charging circuit section 5 is ignored. The peak value of the conventional input current I _M1 and the average input current I _AVE
And the efficiency of the charging circuit unit 5 is taken into consideration, in the case of the present embodiment, the input current I of the electric device M is
_M1 is near I _AVE , and the peak value disappears.

The charging completion switch SW ₁ provided as necessary is in an off state until the storage battery 4 is charged to a certain amount or more, and is turned on when the charging to a certain amount or more is detected. This is to prevent the external load 2 from being turned off even if an external signal is input during the period of receiving the power supply and operating and preventing the intermittent load 2 from turning off before the completion of charging. That is, storage battery 4
It is possible to prevent the malfunction of the intermittent load 2 due to the shortage of the charge amount. Further, the overcharge prevention switch SW ₂ is turned off when the intermittent switch SW _C has a long off time or when the on time is short, that is, when the charge amount becomes too large relative to the discharge amount, and the storage battery 4 is damaged by overcharge. This is to prevent
The power failure compensation switch SW ₃ is turned on when the commercial power supply E is power failure, the power supply of the electronic circuit unit 1 enables effective time only feeding and compensated by the operation of the electric device M of the storage battery 4 from the battery 4.

Embodiment 2 FIG. 12 shows a circuit block diagram of this embodiment. In this embodiment, two charging circuit parts 5a and 5b are provided and the charging circuit part to be charged is switched by the charging circuit changeover switch SW _S. The relationship between the output capacities of the charging circuit parts 5a and 5b is: output capacity of the charging circuit part 5a> output capacity of the charging circuit part 5b.

In this embodiment, therefore, the charging circuit changeover switch SW _S is switched to the charging circuit section 5a side at the initial stage of charging to charge the storage battery 4 with a large charging current, and when this charging reaches a certain amount, the charging circuit is switched. The switch SW _{S is connected} to the charging circuit section 5b.
And the storage battery 4 is charged with a small charging current. Here, the charging circuit changeover switch SW _S may use any method such as a timer or voltage detection of the storage battery 4, current detection, or manual switching. FIG. 13 shows a change in the capacity of the storage battery 4 when the storage battery 4 is charged according to the present embodiment, and when the storage battery 4 is charged for a certain amount C _T or more (when it reaches point a in the figure), the charging circuit. The charging circuit unit 5a is switched to the charging circuit unit 5b by the changeover switch SW _S , the gradient of the charging amount becomes gentle, and when the intermittent switch SW _C is turned on (point B) as in the first embodiment, the battery is discharged. This discharge period is from point B to point C. As described above, according to the two-stage switching charging method, it is possible to shorten the time of rapid charging that shortens the life of the storage battery 4.

〔The invention's effect〕

The present invention relates to a storage battery, a power switch, a first circuit unit connected to a commercial power supply via the power switch, the commercial power supply connected to the commercial power supply via the power switch when the power switch is turned on, and the storage battery And a second circuit unit connected to the storage battery via an intermittent switch that is intermittently turned on and off when the first circuit unit is operating, and the output capacity of the charging circuit unit Is smaller than the load capacity of the second circuit section, and the output current of the charging circuit section and the discharge current from the storage battery are supplied to the second circuit section when the second circuit section is turned on. Therefore, while the power switch is turned on, the storage battery can be charged without fail, and the storage battery can bear the load current during the operation of the second circuit unit, so the input current of the electric device is not so much. Large peak value appears In addition, the value obtained by adding the input current for charging the storage battery to the charging circuit section and the input current of the first circuit section is the required input current value. This also has the effect of making it possible to make the input side wire finer, since it is not necessary to take the peak value into consideration as described above, and there is no more sudden drop in the power supply voltage, causing malfunctions of surrounding electrical equipment. In addition, the storage battery absorbs surges and noise that occur when the intermittent switch is turned on and off, which can reduce noise countermeasures, and by selecting the storage battery voltage to an appropriate value, it has been used conventionally. No need for a stabilized power supply
In addition, the high frequency noise source can be reduced and the conventional 100V
This has the effect of increasing the versatility by allowing the use of equipment that could not be used with the 15A branch, and is also smaller, lighter, and cheaper than conventional stabilized power supplies because it is small.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a conventional example, FIG. 2 is an operation explanatory diagram of the same as above, FIGS. 3 and 4 are different conventional circuit block diagrams, and FIG. 5 is a first example of the present invention. Circuit block diagram, FIGS. 6 to 11 are operation explanatory diagrams of the same as above, FIG. 12 is a circuit block diagram of a second embodiment of the present invention, FIG. 13 is an operation explanatory diagram of the same as above, 1 is an electronic circuit section, 2 is Is an intermittent load, 4 is a storage battery,
5 is a charging circuit section, SW _M is a power switch, and SW _C is an intermittent switch.

Front page continuation (72) Inventor Shuichi Takahashi 1048 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd. (56) Reference JP 54-96748 (JP, A) No. 52-58426) Microfilm (JP, U) filming the details and drawings attached to the application (JP, U) Hachika Huga "" Electrochemical Chemistry Series "(43) Manufacture of measuring instrument by IC" 99 ~ 106 pages, 4th edition, July 30, 1977, published by Koho Publishing Co., Ltd.

Claims (1)

[Claims] 1. An electric device connected to a commercial power source and having first and second circuit parts, wherein a first battery connected to the commercial power source via a storage battery, a power switch, and the power switch.
A charging circuit section that is connected to the commercial power source through the power switch when the power switch is turned on and that charges the storage battery; and an intermittent switch that is turned on and off intermittently when the first circuit section operates. And a second circuit section connected to the storage battery via the storage circuit, wherein the output capacity of the charging circuit section is smaller than the load capacity of the second circuit section, and the second circuit section is charged when turned on. An electric device characterized in that an output current of the circuit section and a discharge current from the storage battery are supplied to the second circuit section.