JPH1141797A - Power supply regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply regulator in which fluctuation of a commercial power supply can be minimized when power is turned on for an apparatus connected with the commercial power supply by increasing the inrush current of the apparatus gradually from a low level. SOLUTION: The power supply regulator incorporating a unit generating an inrush current temporarily upon power supply comprises load lamps 4, 5 being supplied with power from an AC commercial feeder line 1, switching elements 6, 7 connected in series with the load for the commercial feeder line 1, a circuit 9 for detecting the zero-cross point of the AC commercial feeder line 1, means for delivering a firing signal to the switching elements 6, 7 upon elapsing a predetermined time after a zero-cross point signal is detected through the zero-cross detection circuit 9, and an operating means for subtracting a predetermined amount from the time for firing the switching element after zero-cross point sequentially every half cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply adjusting device for OA equipment having an excessive rush current, and more particularly to a power supply adjusting device for reducing the rush current when power is supplied to these devices.

[0002]

2. Description of the Related Art In recent years, with the development of office automation-related technology, the technology of image forming apparatuses such as copying machines, printers, and facsimile machines has greatly developed, and, for example, the power consumption of exposure light sources and fixing heaters of copying machines has increased. There is a tendency. As these exposure light sources and fixing heaters become larger, not only the power consumption thereof increases, but also the rush current flowing through these devices when the power is turned on increases. Image forming apparatuses such as copying machines, printers, and facsimile machines are not connected to a commercial power supply having an infinite power supply capacity, but have a limited power supply. In such a situation, in a situation where the internal impedance of the device at the time of turning on the power is much smaller than that of the commercial power source, the power supply voltage temporarily drops due to the large current flowing into the device. When the commercial power supply voltage temporarily drops, for example, the luminous intensity of an incandescent lamp connected to the same power supply decreases, and in a device such as a fluorescent lamp that obtains luminous intensity by a discharge phenomenon, the fluorescent lamp blinks temporarily. A so-called flicker phenomenon occurs. In particular, when the power is turned on the first time in the morning, since the fixing device of the copying machine is close to room temperature and low in temperature, a considerably large inrush current flows. The inrush current flows into the device not only when power is supplied to the device, but also when such a rush current is generated, for example, during heater ON / OFF control of a fixing device provided in an operating copying machine. Such inconvenience occurs.

For example, the invention described in Japanese Patent Application Laid-Open No. 8-262920 discloses a copying machine in which two heat generators are arranged in accordance with the size of usable paper, and independent of these two heat generators. In a thermal fixing device having two temperature detectors used for lighting control,
Discriminating means for discriminating a correspondence relationship between the two heaters and two temperature detectors used for independent lighting control of these two heaters. Until the determination of the correspondence is completed, only one of the two heaters is turned on, and the determining means determines the correspondence between the two heaters and the two temperature detectors by determining the correspondence between the two heaters. The determination is performed based on the temperature detection values from the two temperature detectors a predetermined time after one of the heat generators is turned on. The determination of the correspondence is based on the temperature detection values from the two temperature detectors after a first predetermined time after one of the two heat generators is turned on. The two temperatures after a second predetermined time. What to do based on the temperature detection value from the detector is described. The invention includes two heat generator, 2
This is intended to prevent erroneous wiring of the two temperature detectors and reduce the rush current to these heaters.

Further, for example, in the invention described in Japanese Patent Application Laid-Open No. 8-110731, in a copying machine, a thermistor for detecting a temperature corresponding to a main heater in a fixing roller and a temperature for detecting a temperature corresponding to a sub-heater are detected. Based on the detection signal of the thermistor, if the temperature of the main heater or the sub-heater is equal to or lower than a predetermined value, even if both heaters are turned on in accordance with the paper size, the main heater is turned on first, and after the predetermined time elapses Turn on the sub heater. Alternatively, when the signal from the cover switch detects that the main body cover is closed from released, the same control is performed. Thus, the rush current when the heater is turned on is reduced, and the burden on the triac, which is the control element of each heater, is reduced.

However, in the above two prior arts, the rush current is reduced only to the fixing device inside the copying machine. Therefore, the rush current flowing to other devices of the copying machine cannot be reduced. Even if there is a way to reduce the inrush current in the above device, when the copier is powered on, a large total inrush current will still flow, adversely affecting the commercial power supply to which the copier is connected. Will affect you. Also, the method of suppressing the inrush current does not increase the current gradually from the time of power-on, and thus does not lead to a smooth suppression of the inrush current.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional disadvantages, and an object of the present invention is to gradually increase the voltage of equipment connected to a commercial power supply from a low state. It is an object of the present invention to provide a power supply adjusting device capable of minimizing a fluctuation of a commercial power supply when a power supply of a device is turned on.

[0007]

In order to achieve the object of the present invention as described above, the present invention relates to a power supply adjusting device for a device having therein a device in which an inrush current is temporarily generated when power is supplied. The power supply control is performed every half cycle of the power supply voltage from the beginning of power supply, and the voltage supply time to the equipment is gradually increased in a time-sharing manner within each half cycle from the beginning of power supply, and the current flowing to the power supply is increased. Provided is a power supply adjustment device, wherein a current adjustment unit that suppresses a predetermined value that does not affect an external power supply is provided at a power supply line entrance of a device having a downstream device that generates an inrush current when power is supplied. . The voltage supply time gradually increasing means for each half cycle of the power supply voltage in the current adjusting unit gradually increases the voltage supply time to the device from the end of the half cycle forward with the progress of the power supply control for each half cycle. Wherein the current flowing through the power supply is suppressed to a predetermined value that does not affect the external power supply. The supply time is gradually increased from the beginning of the half cycle toward the rear with the progress of the power supply control for each half cycle, and the current flowing through the power supply is suppressed to a predetermined value that does not affect the external power supply, The time division time is 1 μs to 1 ms.

Further, the present invention relates to a power supply adjusting device for a device including therein a device in which an inrush current is temporarily generated at the time of power supply, a load receiving power from an AC power supply,
A switching element connected in series to the load with respect to the power supply; a zero-crossing detection circuit for detecting a zero-crossing point of the AC power supply; and the switching element after a lapse of a predetermined time from a zero-crossing point signal detected by the zero-crossing detection circuit. And a calculating means for sequentially reducing the ignition time for igniting the switching element from the zero-cross point by a predetermined value every half cycle. I will provide a. The time for sequentially reducing the ignition time for igniting the switching element from the zero-cross point by a predetermined value every half cycle is 1 μs.
１1 ms. In addition, a device in which an inrush current is temporarily generated when power is supplied is a copier equipped with a heat fixing device.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a circuit block diagram showing an embodiment in which the power supply adjusting device of the present invention is applied to a fixing device of a copying machine. In FIG. 1, reference numeral 1 denotes a commercial power supply line, which is an alternating current of 100 V to 230 V having a frequency of 50 Hz or 60 Hz. In Japan, it is an alternating current of 100 V having a frequency of 50 Hz or 60 Hz. Reference numeral 2 denotes a device provided with a device in which an inrush current is temporarily generated at the time of power supply, such as a fixing device of a copying machine. In FIG. 1, a fixing device 2 is connected to a commercial power line 1 by an outlet 3. Inside the fixing device 2, a first lamp 4 and a second
The lamp 4 is connected in series with a first switching element 6 composed of a triac, and these series circuits are connected to the commercial power supply line 1. The lamp 5 is connected in series with a second switching element 7 made of a triac, and these series circuits are connected to the commercial power line 1.

These first and second lamps 4 and 5 are both disposed in a fixing roller of a copying machine (not shown), and heat the fixing roller as a heater. When the heat is taken away by this and the temperature of the central portion of the heating roller is about to decrease, the first
Of the first lamp 4
To maintain a constant temperature of the entire fixing roller. TH1 and TH2 are thermistors for detecting the temperature of the fixing roller. Note that this type of fixing device is described in, for example, Japanese Patent Application Laid-Open No. HEI 8-110731, and is well known, so that further description will be omitted.

Reference numeral 9 denotes a zero-cross detection circuit, which includes two photocouplers 10, 11 and a comparator 12,
The timing at which the commercial AC power supply crosses the zero point at the phase angles of zero and 180 degrees is detected. Reference numeral 13 denotes a control circuit, which is a CPU 14, a ROM 15 storing a lamp phase control program according to the present invention, a file such as a table, and other data necessary for control of the present invention.
4 has an I / O circuit 16 for transmitting the trigger signal from 4 to the switching elements 6 and 7. Reference numeral 17 denotes a RAM that temporarily stores the results calculated by the CPU 14 and the like.

Next, the operation of the zero-cross detection circuit 9 will be described. The voltage of the commercial power supply line 1 shown in FIG. 1 changes sinusoidally as shown in FIG. The photodiode built in the photocoupler 10 is turned on between zero degrees and 180 degrees. Accordingly, the phototransistor built in the photocoupler 10 is turned on during this time. The photodiode built in the photocoupler 11 is turned on between 180 degrees and 360 degrees. Accordingly, the phototransistor built in the photocoupler 11 is turned on during this time. When the commercial power supply voltage crosses the zero point, both photocouplers are turned off at the same time, but the comparator 12 captures this point and generates an output signal. In response to this signal, the waveform shaping circuit 8 composed of a one-shot multivibrator forms a zero-cross signal as shown in FIG. The zero-cross signal formed in the waveform shaping circuit 8 is transmitted to the I / O circuit 1
6 to the CPU 14.

Next, the control flow in the controller 13 after the power is turned on to the fixing device of the copying machine to which the present invention is applied will be described in detail. FIG. 3 is a flowchart showing a main routine of a control flow necessary for operating the fixing device. When the power is turned on to the fixing device shown in FIG. 1, the process proceeds to step S1. In the present embodiment, for example, when the power is turned on to the fixing device by turning on a power supply device (not shown), the controller 13 knows when the comparator 12 first sends a zero-cross pulse to the CPU 14. In step S1, it is confirmed that there is no lighting request for the first lamp 4 and the second lamp 5, and that lighting of these lamps is not prohibited.

In step S2, the power is turned on to the fixing device, and it is checked whether or not these lamp-on signals are generated in the controller 13. Further, it is 0.2 seconds or more after the lamp-on signal is generated. Is determined. If the time has elapsed, the process proceeds to step S3. Here, it is confirmed that lighting of the lamp is not prohibited. If no operation error is found in step S4, the process proceeds to lamp control in step S5.
This lamp control will be described later. Step S2
If it is determined that the time has not elapsed for 0.2 seconds or more since the lamp-on signal was generated, the process jumps to step S4.
If an operation error is found in step S4 in step S43, it is confirmed that there is no request to turn on the first lamp 4 and the second lamp 5, and the process returns to step S2.

FIG. 4 is a flowchart showing a lamp control routine. This flow is a detailed flow of step S5 in FIG. When the process proceeds from step S5 to step T1, it is reconfirmed whether there is a lighting request for the first lamp 4. If there is a request, the process proceeds from step T1 to step T2, where the thermistor TH1 of the fixing device detects the request. If the temperature is equal to or higher than 173 degrees, the process proceeds to step T3, turns off the light without requesting to turn on the first lamp 4, and proceeds to the operation flow of the second lamp 5 described later. If the temperature of the fixing unit is lower than 173 degrees in step T2, the operation of the first lamp 4 is continued, and the operation flow proceeds to the operation of the second lamp 5 described later. If there is no request for lighting of the first lamp 4 in step T1, the process proceeds to step T4, and it is confirmed whether the lighting of the first lamp 4 is prohibited. If the operation is prohibited, the operation proceeds to the operation flow of the second lamp 5 described later. If not, the process proceeds to step T5, where the thermistor TH of the fixing device is set.
If the temperature detected by 1 is higher than 167 degrees, the operation proceeds to the operation flow of the second lamp 5 described later.

If the temperature detected by the thermistor TH1 of the fixing unit is 167 ° C. or less, the process proceeds to step T6. In step T6, the first lamp 4 is requested to be turned on, and the phase control of the first lamp 4 is requested. It is confirmed that the lamp-on prohibition is yes, and the second lamp 5 described later
Move to the operation flow of. That is, in step T6, the flow is shifted to a flow in which the first lamp 4 is turned on by applying the phase control without applying the full voltage to the first lamp 4. The flow from step T7 to step T12 is a lighting preparation flow by phase control for the second lamp 5, and is the same as the lighting preparation by phase control of the first lamp 4 from step T1 to step T6. Description is omitted.

FIG. 5 is a flowchart of an interrupt subroutine for the phase control lighting of the first lamp 4 and the second lamp 5 with respect to the main routine. In step U1, first, a request for phase control is made for the first lamp 4 and the second lamp 5, and (9 ms) is set for the timers 1 and 2, and then the process proceeds to step U2. In step U2,
Wait until an interrupt instruction is issued. When the interrupt instruction is issued, the process proceeds to steps U3, U5, and U5, respectively. In step U3, the first lamp 4 and the second lamp 5
Is performed, the first lamp 4 of the fixing device,
In order to reduce the inrush current when the second lamp 5 is turned on, according to the present invention, the voltage applied to the first lamp 4 and the second lamp 5 is gradually increased in a division time of 1 μs to 1 ms, and then the total voltage is reduced. Phase control for switching to lighting is performed. In our experiments, 42.6 in half cycle (10 ms).
The lighting time was gradually increased every μs, and phase control was performed until all the lighting was performed after about 100 cycles. As a result, when the power supply to the fixing device is turned on, the flicker phenomenon of the fluorescent lamps connected to the same power supply line is improved.

When the first lamp 4 is turned on by the phase control in step U4, the timer 1 operates for 9 ms.
Is counted up until the time reaches
When the second lamp 5 is turned on by the phase control, the timer 2 counts up until it reaches 9 ms.

Next, details of the lamp phase control will be described. FIG. 6 is a flowchart showing details of the ramp phase control. In FIG. 6, there is a request to turn on the first lamp 4 in step V1, a request to control the phase of the first lamp 4 in step V2, and a signal instructing the operation of the first lamp 4 is turned on in step V3. Then, the phase control operation of the first lamp 4 is started, and similarly, steps V4 to V6 are performed.
Then, the phase control operation of the second lamp 5 is also started.

If there is no request to turn on the first lamp 4 in step V1, it is confirmed in step V7 that there is no phase control request for the first lamp 4, and then the timer is set to a timer value of 1 (9 ms). In step V9, the first lamp 4 signal is turned off, the apparatus enters a standby state, and the operation shifts to the phase control operation of the second lamp 5 in step V4. If the first lamp 4 control request is not issued in step V2, the timer value 1 (9 ms) is set in the timer 1 in step V10, and the process proceeds to step V9. If there is no request to turn on the second lamp 5 in step V4, after confirming in step V11 that there is no phase control request for the second lamp 5, the timer is set to the timer value 2 (9 ms). Set, step V
At step 13, the second lamp 5 signal is turned off to put the apparatus in a standby state, and then the routine is left. In step V5, the second
If there is no lamp 5 control request of step V1
At 4, set timer value 2 (9 ms) to timer 2,
The process moves to step V13.

Next, the first lamp 4 will be described with reference to FIG.
The phase control of the second lamp 5 will be described. First, the phase control of the first lamp 4 will be described. When the power of the fixing device is turned on and the phase control of the first lamp 4 is started, the timer value 1 (9 ms) is set in the timer 1. Inside the CPU 14, the timer value 1 (9 ms) set in the timer is read,
This is temporarily reserved in the work area of the RAM 17. This reserved value is read out, and in the CPU 14, (9 ms-
0) is performed, and the calculation result (9 ms) is stored in the RAM 1
7 is stored in an address for storing a command value for commanding the firing angle timing of the first switching element 6. When the next zero-cross signal is input, the timer starts operating. When the value of the timer reaches the command value reserved in the work area, a firing command is issued to the first switching element 6 and the first switching element 6 is activated. Lamp 4 lights up. However, when the zero cross signal is issued and the power supply voltage becomes zero next time, the first switching element is extinguished. Therefore, the current flowing through the first lamp 4 is extremely small.

When the second zero-cross signal is generated, C
Inside the PU 14, the (9 ms) stored in the RAM 15 is read out in parallel with the timer count.
(9 ms−Δt), and the calculation result is stored in RAM
The old data stored at the address storing the command value for commanding the firing angle timing of the first switching element 6 is rewritten with new data (9 ms-Δt). When the next zero-cross signal is input, the timer starts operating. When the value of the timer reaches the command value (9 ms-Δt) reserved in the work area, the first switching element 6 receives an ignition command. When emitted, the first lamp 4 is turned on. However, when the zero cross signal is issued and the power supply voltage becomes zero next time, the first switching element is extinguished. Due to this operation, the time during which the first lamp 4 is turned on becomes longer than the previous time by (Δt), but the current flowing through the first lamp 4 does not become so large.

When the third zero-cross signal is generated, C
Inside the PU 14, in parallel with the timer count, (9 ms−Δt) stored in the RAM 15 is read, and an operation of (9 ms−2 · Δt) is performed. 6 is replaced with new data (9 ms−2Δ)
Rewrite to t). When the next zero-cross signal is input, the timer starts operating. When the timer value reaches the command value (9 ms−2 · Δt) reserved in the work area, the first switching element 6 is fired. A command is issued,
The first lamp 4 lights up. However, when the zero cross signal is issued and the power supply voltage becomes zero next time, the first switching element is extinguished. By this operation, the first lamp 4
Is longer than the previous time by (Δt), but the current flowing through the first lamp 4 does not become so large.
In this embodiment, Δt is set to 42.66 μs.

Such an operation is repeatedly performed, and the lighting time of the first lamp 4 is gradually increased. When such an operation of gradually increasing the current is repeated two hundred and several tens times, (9 ms-n
Δt) becomes zero, the phase control to the switching element 6 is completed, the operation is switched to the all-ignition operation, and the first lamp 4
, A full current flows to heat the fixing roller. Thereafter, the known low-temperature control is performed on the fixing roller and the first lamp 4 by controlling the gate of the first switching element 6. The same phase control is performed on the second lamp 5 at the same time as the phase control on the first lamp 4 is started. However, the same control as that on the first lamp 4 is performed. Therefore, a detailed description thereof will be omitted.

FIG. 8 shows a case where the present invention is applied to an apparatus in which a plurality of devices through which a large amount of inrush current flows when power is supplied are provided, and each device has no means for reducing the inrush current. FIG. 3 is a circuit block diagram showing an embodiment. In FIG. 8, reference numeral 20 denotes a device through which a large amount of inrush current flows when power is supplied, and which does not take measures to prevent inrush current, for example, an electric device including a plurality of large heaters, a large induction motor, and the like. . The inside of the electric device 20
Power switch 2 on power line drawn from outlet 3
1 and a switching element 22 are provided, and a power supply bus 23 is connected downstream thereof. A plurality of devices 24... Through which a large amount of inrush current flows when power is supplied are connected to the power bus 23. Further, a device having no or very little rush current, for example, a signal system circuit 25 is connected to the power supply line upstream of the switching element.
Further, a zero-cross detection circuit 9 and a controller 13 are provided.
1 and upstream of the switching element 22. Since the configuration is the same as that of the above-described embodiment including the zero-crossing detection circuit 9 and the controller 13, the same reference numerals are given to the respective portions, and description thereof will be omitted.

In this embodiment, when the power switch 21 is turned on and the first zero-cross signal reaches the CPU 14, the phase control of the switching element 22 starts.
This phase control operation is performed in exactly the same way as in the above embodiment. That is, when the power is turned on, first, power is supplied only in the second half of the power supply frequency, that is, 42.66 μs, and in the next half cycle, the second half (2 * 42.66 μs) is supplied.
s) Only when power is supplied, the power supply time is extended with the passage of time, and after a predetermined time,
A phase control operation for supplying full power is performed. By performing such control, even if an electric device has a device through which a large amount of inrush current flows, a large amount of inrush current does not flow through the device 20 itself at the time of power supply. For example, a fluorescent lamp or the like connected to the camera does not cause flicker.

In the above two embodiments, the half cycle is time-divided every 42.66 μs. However, depending on the amount of inrush current flowing through the electric equipment and the inrush current duration, this time-sharing time may be reduced from 1 μs to It can be set freely within 1 ms. Further, in the embodiments described above, the means for gradually increasing the voltage supply time for each half cycle of the power supply voltage in the current adjustment unit reduces the voltage supply time to the device from the end of the half cycle as shown in FIG. , The current flowing in the power supply is suppressed to a predetermined value that does not affect the external power supply. Supply time,
The power supply control may be gradually increased by Δt from the beginning of the half cycle to the rear with the progress of the power supply control for each half cycle to suppress the current flowing through the power supply to a predetermined value that does not affect the external power supply.

Although the present invention has been described with reference to the above-described embodiment, various modifications and applications are possible within the scope of the present invention, and these modifications and applications are excluded from the scope of the present invention. is not.

[0029]

According to the first to eighth aspects of the present invention, in a power supply adjusting device for a device including therein a device in which an inrush current is temporarily generated at the time of power supply, power supply control is performed from an early stage of power supply. A predetermined value that is supplied every half cycle of voltage and that the voltage supply time to the equipment is gradually increased in a time-sharing manner within each half cycle from the beginning of power supply, and that the current flowing through the power supply does not affect the external power supply Is provided at the entrance of the power supply line of a device downstream of a device that generates an inrush current when power is supplied, so that when the device of the present invention is powered on, a large amount of inrush current flows into the commercial power supply line. Does not flow. Therefore, there is no effect on devices connected to the same commercial power supply line, and no inconvenient phenomenon such as a flicker phenomenon occurs. In addition, Claims 2 and 3
In the invention described in 5, the voltage supply time gradually increasing means for each half cycle of the power supply voltage in the current adjusting unit increases the voltage supply time to the device from the end of the half cycle forward.
Alternatively, the power supply control is gradually increased from the beginning of the half cycle to the rear with the progress of the power supply control for each half cycle, and the current flowing through the power supply is suppressed to a predetermined value that does not affect the external power supply. The supply voltage can be gradually increased every time. In particular, when the time division time of the control is set to 1 μs to 1 ms as in the inventions according to the fourth and sixth aspects, the current supplied to the device can be smoothly increased gradually. A current supply operation from a transient period in which current flows to a steady state can be smoothly executed in a minimum time. When the present invention is applied to a copying machine and applied to a fixing device of the copying machine as in the inventions of claims 7 and 8, the rush current at the time of turning on and off the power becomes substantially zero, and the effect is reduced. It will be noticeable.

[Brief description of the drawings]

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

FIG. 2 is a waveform diagram showing a relationship between a commercial power supply voltage and a zero cross signal.

FIG. 3 is a flowchart of a main routine in lamp control.

FIG. 4 is a flowchart of lamp control.

FIG. 5 is a flowchart of an interrupt routine.

FIG. 6 is a flowchart of lamp phase control.

FIG. 7 is a waveform diagram showing a state of phase control.

FIG. 8 is a circuit block diagram showing a second embodiment of the present invention.

[Explanation of symbols]

1 ······················································································································ First lamp First switching element 7 Second switching element 8 Waveform shaping circuit 9 Zero crossing detection circuit 10 Photocoupler 11 Photocoupler 12 Comparator 13 Controller 14 CPU 15 ROM 16 I / O circuit 17 RAM 20・ Electrical device 21 ・ ・ ・ ・ Power switch 22 ・ ・ ・ ・ Switching element 23 ・ ・ ・ ・ ・ ・ Power bus 24 ・ ・ ・ ・ ・ Device which flows a large amount of inrush current when power is supplied 25 ・ ・ ・ ・ Signal System circuit

Claims (7)

[Claims] 1. A power supply adjusting device for a device including therein a device in which an inrush current is temporarily generated at the time of power supply, wherein supply control is performed every half cycle of a power supply voltage from an initial stage of power supply. A current adjusting unit that gradually increases the voltage supply time in a time-division manner within each half cycle from the beginning of the power supply and suppresses the current flowing through the power supply to a predetermined value that does not affect the external power supply. A power supply adjusting device provided at an inlet of a power supply line of a device having a device that generates an inrush current downstream. 2. The power supply control device according to claim 1, wherein the voltage supply time gradually increasing means for each half cycle of the power supply voltage in the current adjustment section controls the voltage supply time to the device from the end of the half cycle to the front in each half cycle. 2. The power supply adjusting device according to claim 1, wherein the power supply adjusting device gradually increases the current as time passes, and suppresses a current flowing through the power supply to a predetermined value that does not affect an external power supply. 3. A voltage supply time gradually increasing means for every half cycle of a power supply voltage in the current adjusting section, the voltage supply time to the device is controlled by a power supply control for each half cycle from the beginning of the half cycle to the rear. 2. The power supply adjusting device according to claim 1, wherein the power supply adjusting device gradually increases the current as time passes, and suppresses a current flowing through the power supply to a predetermined value that does not affect an external power supply. 4. The power supply adjusting device according to claim 1, wherein said time-division time is 1 μs to 1 ms. 5. A power supply adjusting device for a device including therein a device in which an inrush current is temporarily generated at the time of power supply, wherein the load receives power from an AC power supply, and the load is connected in series with the load. A switching element connected to the AC power supply; a zero-crossing detection circuit for detecting a zero-crossing point of the AC power supply; and transmitting a firing signal to the switching element after a lapse of a predetermined time from the zero-crossing point signal detected by the zero-crossing detection circuit. Means, and arithmetic means for sequentially reducing the ignition time for igniting the switching element from the zero-cross point by a predetermined value every half cycle,
A power supply adjusting device comprising: 6. The power supply according to claim 5, wherein the time for sequentially reducing the ignition time for igniting the switching element from the zero-cross point by a predetermined value every half cycle is in the range of 1 μs to 1 ms. Adjustment device. 7. The power supply adjusting device according to claim 1, wherein the device in which an inrush current is temporarily generated when power is supplied is a copying machine having a heat fixing device.