JP2000092744A - Power supply device and its control method, and image- recording device and its control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a control power supply required for communication or the like with a body side at optional equipment without requiring any software processing when a power supply system for feeding power to the optional equipment side fails. SOLUTION: The low voltage of each output system of a drive system power supply system is detected, it is verified whether the low voltage has been detected or not, power is fed from an output system of 24 V of the normal drive system power supply system of a power supply part 103 when no low voltage has been detected, the output of the drive system power supply system is broken when the low voltage has been detected, and at the same time power is fed from an output system of 10 V of the control system power supply system of the power supply part 103.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for supplying power to an image recording apparatus such as a copying machine, a printer, a facsimile, and the like. In particular, an optional apparatus such as a document feeder is externally connected to the image recording apparatus. The present invention relates to a power supply device having a plurality of outputs for supplying necessary power from an image recording device, a control method thereof, an image recording device and a control method thereof.

[0002]

2. Description of the Related Art A system configuration of a conventional copying machine will be described with reference to FIG. In the figure, 100 is a copying machine main body,
101 is an external AC power supply, 102 is a main switch which is a power switch, 103 is an external AC power supply
This is a DC power supply unit that converts the power into (DC) power and supplies power to each unit in the copying machine main body 100.

Reference numeral 104 denotes a main body control unit,
5, operation unit 106, software switch 10 of operation unit 106
7, loads 108 such as solenoids and clutches and fans,
An AC driver 109 for an AC load 110 such as a fixing heater,
A motor controller 111 for driving and controlling a motor 112 such as a main motor and an optical motor;
4, a high-voltage power supply unit 113 for supplying a high-voltage power supply, a fluorescent lamp inverter 115 for a fluorescent lamp 116, an image sensor unit 118 that scans an original and converts the read image data into digital data, and a read by the image sensor unit. An image processing unit 117 for processing image data and a laser control unit 119 for forming a latent image on a photosensitive drum based on the image data are controlled.

[0004] Reference numerals 120 and 122 denote a copy cassette deck as a paper feeder and a sorter as a paper discharge processing unit, which are externally connected as optional devices of the copying machine.
Each has control power supply units 121 and 123 inside.

[0005] The DC power supply unit 103 supplies power for control necessary for the main body control unit 104, image processing unit 117, image sensor unit 118, and laser control unit 119 to 3.3V, 5V, 1V.
A control system power supply system that divides and supplies power to 2 V and 15 V output systems, and a drive power supply necessary for the main body control unit 104, the motor control unit 111, the high voltage power supply unit 113, and the fluorescent lamp inverter unit 115 for the fluorescent lamp 116 Is divided into 24 V and 38 V output systems, and a power supply system is provided for supplying power to the copy cassette deck 120 and the sorter 122 from the 24 V output system of the drive system power supply system.

[0006] The DC power supply unit 103 is provided with an overcurrent detection / protection circuit for each output system or each of a drive system power system and a control system power system.
When an abnormality occurs in the load or the power supply bundle to the load and a current exceeding the set value flows, the output voltage of the system in which the abnormality has occurred is throttled (reduced) or the output is cut off. Prevents the current from flowing through the load and its bundle for a long time, and stresses the switch element of the power supply unit, wiring materials, etc.
Further, the configuration is such that an operation is performed so as to suppress a failure of an element in the power supply unit as a load.

The detailed configuration of the power supply section 103 of the above-described copying machine will be described with reference to FIG. In the figure, D _{1 to} D ₄ are diodes, C ₁ is a smoothing capacitor, and
01 is rectified and smoothed and converted to a DC power supply. This DC power supply is divided into a control system power supply system and a drive system power supply system.

First, in a control system power supply system, a pulse voltage modulated by a transistor Tr ₁ and a PWM (pulse width modulation) control circuit 205 is divided into three output systems by a transformer Ta and transformed, and diodes Da ₁ and Da are respectively applied. ₂ ,
Db ₁ , Db ₂ , Dc ₁ , Dc ₂ , coils La, Lb,
Lc, rectification by smoothing capacitors Ca, Cb, Cc,
Smoothing is performed to form an output system of a DC power supply of 15 V, 12 V, and 5 V.

The power from the 5 V output system is supplied to the transistor Tr ₃ , the PWM control circuit 207, the diode D
3.3 V due to d, coil Ld and smoothing capacitor Cd
Of the DC power supply. The PWM control circuit 205 controls the pulse width based on signals from the overcurrent detection circuit 203 for detecting the primary side overcurrent and the voltage detection circuit 208 for detecting the voltage of the output system of 5V, and also controls the 15V and 12V. Is shut down by a signal output at the time of overcurrent from the overcurrent detection circuits Oa and Ob detecting the overcurrent to the output system. In the 3.3 V output system, the PWM control circuit 207 determines the pulse width based on signals from the voltage detection circuit 209 and the overcurrent detection circuit Od.

Next, in the drive system power supply system, the pulse voltage modulated by the transistor Tr ₂ and the PWM control circuit 206 is divided and transformed into two output systems by the transformer Tb, and the diodes De ₁ , De ₂ and Df ₁ , respectively. , Df ₂ ,
Rectification and smoothing are performed by the coils Le and Lf and the smoothing capacitors Ce and Cf to form an output system of a DC power supply of 38V and 24V.

The PWM control circuit 206 performs pulse width control based on signals from an overcurrent detection circuit 204 for detecting an overcurrent on the primary side and a voltage detection circuit 209 for detecting a voltage of an output system of 24 V. When the voltage of the 5 V output system of the system power supply system becomes equal to or less than the set value, it is detected by a signal from the low voltage detection circuit Uc that detects the voltage.
Performs n / off control.

In the optional equipment connected to the copying machine having the above configuration, the load is mainly a driving system such as a motor due to the nature of the paper feeding device and the paper discharging processing device. Power is supplied only from the drive system power supply system,
The control power supply is generated independently from the supplied power supply.

In recent years, there has been an increasing demand for improvement of reliability and safety and simplification of processing at the time of occurrence of an abnormality. In addition to dividing the output system for each load, it notifies the main controller of the location of each abnormality occurrence, and if an abnormality occurs in the drive system power supply system, shuts off only the drive system power supply system and specifies processing means etc. Like that.

[0014]

However, in the conventional copying machine as described above, when the optional equipment is to be used as it is, the power supply required on the optional equipment side is entirely the power supply of the copying machine main body. Since power is supplied from the drive system power supply system, if an abnormality occurs in any of the drive system power supply systems and the power supply is interrupted, the power supply to the optional device is interrupted, and the option device also generates a control power supply. This makes it impossible to perform control signal communication between the control side of the copying machine main unit and the optional device side, which causes a problem that a malfunction may occur. Was.

In addition to the above-mentioned failure due to communication failure, not only when an error occurs in an optional device, but also when the power supply output required by the copying machine main body to the power supply unit is stopped, a drive system load runaway is prevented. The system power supply system was stopped first, and then the control system power supply system was stopped after a certain period of time, resulting in similar symptoms when the power supply was turned off. However, the conventional optional equipment cannot be used, and a new design has to be performed. As a result, there has been a problem that the price is increased when configuring the system.

Another problem is that software for controlling the optional equipment is provided with a means for monitoring the output of the power supply unit to check the power supply output at regular time intervals.
By causing the power supply device to notify the occurrence of an abnormality, it is possible to perform processing so that communication between the devices does not have a problem when the power output is cut off. And the like, and the software processing becomes complicated.

The present invention has been made in order to solve the above-mentioned problems, and does not require processing by software, and utilizes the power supply protection function provided conventionally to supply power to optional devices. A power supply device, a control method thereof, a control method thereof, an image recording device and a control method thereof capable of securing a control power supply required for communication with a main device in an optional device when an abnormality occurs in a power supply system to be performed. With the goal.

[0018]

The power supply apparatus and its control method, the image recording apparatus and its control method according to the present invention are configured as follows.

(1) A power supply device mountable on a main unit, wherein a plurality of power supply systems and a power supply required for each load system of the main unit are divided into a plurality of output systems from the respective power supply systems. Power supply output dividing means for supplying power, overcurrent detecting means for detecting overcurrent in each of the load systems, and when the overcurrent is detected by the overcurrent detecting means, the voltage of the output system is reduced. Control means for controlling the output voltage of the power supply system, and voltage drop detection means for detecting when the voltage of each of the output systems falls below a set value, and While power is supplied to the optional device of the main unit by the output system of the predetermined power system, the voltage of any output system of the power system for supplying power to the optional device becomes abnormal when the voltage becomes lower than a set value. The optional device is supplied with power as an auxiliary power from an output system of a power system different from the predetermined power system.

(2) In the power supply device of the above (1),
A power supply system for supplying power to a load of a control system of the main unit; and a driving system power supply system for supplying power to a load of a drive system of the main unit. The power is supplied to the optional device from the predetermined output system, and the auxiliary power supply to the optional device is controlled when the voltage of any of the output systems of the drive power system is detected to be equal to or less than a set value. The power is generated and supplied in the output smoothing coil unit of the predetermined output system of the system power supply system, so that the power is superimposed on the normal power supply output system.

(3) A method of controlling a power supply unit mountable on a main unit, wherein power required for each load system of the main unit from a plurality of power supply systems is divided into a plurality of output systems and supplied with power. When an overcurrent is detected by an overcurrent detection unit that detects an overcurrent of each of the load systems, an output voltage of the power system is controlled so as to drop a voltage of the output system. Power is supplied to the optional device of the main unit by the output system of the predetermined power system of the power system, and the voltage of one of the output systems of the power system for supplying power to the optional device is equal to or less than the set value. That is, when an abnormality is detected by the voltage drop detecting means, power is supplied to the optional device as an auxiliary power from an output system of a power system different from the predetermined power system.

(4) In the control method of the power supply device of the above (3), a control system power supply system for supplying power to a control system load of the main unit and a power supply system for supplying power to a drive system load of the main unit are usually provided. Power is supplied to the optional device from a predetermined output system of the drive system power supply system of the two switching power supply systems of the drive system power supply system, and the voltage of one of the output systems of the drive power supply system is equal to or less than a set value. When an abnormality is detected, the auxiliary power supply to the optional device is generated and supplied to the output smoothing coil unit of the predetermined output system of the control system power supply system. I did it.

(5) In the image recording apparatus, a plurality of power supply systems and a power supply for dividing a power supply required for each load system of the image recording apparatus main body from the respective power supply systems into a plurality of output systems and supplying power to each of the plurality of output systems. Output dividing means, overcurrent detecting means for detecting an overcurrent of each of the load systems, and an output of the power system so as to drop the voltage of the output system when the overcurrent is detected by the overcurrent detecting means. Control means for controlling the voltage, and voltage drop detection means for detecting when the voltage of each of the output systems becomes equal to or less than a set value, and a predetermined power supply system of the plurality of power supply systems Power is supplied to the optional device of the image recording apparatus main body by the output system, and the voltage of any output system of the power supply system for supplying power to the optional device is abnormal when the voltage becomes lower than a set value. The optional device is supplied with power as an auxiliary power from an output system of a power system different from the predetermined power system.

(6) In the image recording apparatus according to the above (5), a control system power supply system for supplying power to a control system load of the image recording apparatus main body and a power supply for a drive system load of the image recording apparatus main body are supplied. It is provided with two switching power supply systems of the drive system power supply system, and usually supplies power to an optional device from a predetermined output system of the drive system power supply system, and the voltage of any output system of the drive power supply system is set. In the event of an abnormality detected to be less than or equal to the specified value, an auxiliary power supply to the optional device is generated in the output smoothing coil unit of a predetermined output system of the control system power supply system and supplied with power to superimpose on the normal power supply output system. To supply power.

(7) In the control method of the image recording apparatus, the power supply required for each load system of the image recording apparatus main body is divided into a plurality of output systems from a plurality of power supply systems, and the power supply output is divided for supplying power. When an overcurrent is detected by the overcurrent detection means for detecting the overcurrent of each load system, the output voltage of the power system is controlled so as to reduce the voltage of the output system, and the plurality of power systems are controlled. Power is supplied to the optional device of the image recording apparatus main body by the output system of the predetermined power system, and the voltage of any output system of the power system for supplying power to the optional device is reduced to a set value or less. When an abnormality is detected by the voltage drop detection means, power is supplied to the optional device as auxiliary power from an output system of a power supply system different from the predetermined power supply system.

(8) In the control method of the image recording apparatus of the above (7), usually, a control system power supply system for supplying power to a control system load of the image recording apparatus main body and a drive system of the image recording apparatus main body. Power is supplied to an optional device from a predetermined output system of the drive system power supply system of the two switching power supply systems of the drive system power supply system for supplying power to the load, and a voltage of one of the output systems of the drive power supply system is provided. When an abnormality is detected to be less than or equal to a set value, a normal power output is generated by generating and supplying an auxiliary power to the optional device in an output smoothing coil unit of a predetermined output system of the control system power system. The power was superimposed on the grid.

[0027]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a system configuration of a copying machine which is an image recording apparatus according to the present invention. In addition,
4 and 5 will be described using the same reference numerals.

In FIG. 1, reference numeral 100 denotes a copying machine main body;
Reference numeral 1 denotes an external AC power supply, reference numeral 102 denotes a main switch as a power switch, and reference numeral 103 denotes a DC power supply unit that converts an external AC power supply into a DC (DC) power supply and supplies power to each unit in the copier main body 100.

Reference numeral 104 denotes a main body control unit, and the sensors 10
5, operation unit 106, software switch 10 of operation unit 106
7, loads 108 such as solenoids and clutches and fans,
An AC driver 109 for an AC load 110 such as a fixing heater,
A motor controller 111 for driving and controlling a motor 112 such as a main motor and an optical motor;
4, a high-voltage power supply unit 113 for supplying a high-voltage power supply, a fluorescent lamp inverter 115 for a fluorescent lamp 116, an image sensor unit 118 that scans an original and converts read image data into digital data, and an image sensor unit 118 reads the image data. The image processing unit 117 performs processing of the image data, and controls the laser control unit 119 for forming a latent image on the photosensitive drum based on the image data.

Numerals 120 and 122 denote a copy cassette deck as a paper feeding device and a sorter as a paper ejection processing device, which are externally connected as optional devices of the copying machine.
Each has control power supply units 121 and 123 inside.

The DC power supply 103 supplies 3.3V, 5V, 1V power for control necessary for the main body control unit 104, the image processing unit 117, the image sensor unit 118, and the laser control unit 119.
A control system power supply system that divides and supplies power to 2 V and 15 V output systems, and a drive power supply necessary for the main body control unit 104, the motor control unit 111, the high voltage power supply unit 113, and the fluorescent lamp inverter unit 115 for the fluorescent lamp 116. Is a switching power supply that has a drive system power supply system that supplies power by dividing the power supply into 24 V and 38 V output systems, a converter is provided in each of the power supply systems, and switching control of each power supply system.

Normally, a power is supplied to the copy cassette deck 120 and the sorter 122 from the 24 V output system of the drive system power supply system via the diode Dma. ) Includes a diode D as an auxiliary power supply from the 5 V output system of the control system power supply system.
Power is supplied via sa.

The detailed configuration of the power supply unit 103 of the above-described copying machine will be described with reference to FIG. In the figure, D _{1 to} D ₄ are diodes, C ₁ is a smoothing capacitor, and
01 is rectified and smoothed and converted to a DC power supply. This DC power supply is divided into a control system power supply system and a drive system power supply system. A voltage detection circuit 201 detects an AC power supply voltage and outputs a detection signal to a sequence generation circuit.

[0035] First, in the drive system power source line, divides the pulse voltage that is modulated by the transistor Tr _2, PWM control circuit 206 into two output lines by transfection (power supply output division unit) Tb, and the transformer, each diode De _1, De
₂ , Df ₁ , Df ₂ , coils Le, Lf, and smoothing capacitors Ce, Cf for rectification and smoothing.
The output system of the V DC power supply is configured. On the primary side, there is provided a total current excess detection circuit (overcurrent detection means) 204 for monitoring the total amount of current flowing through each output system on the secondary side by detecting overcurrent on the primary side; An overcurrent detection circuit (overcurrent detection means) Oe ₁ , Oe ₂ , Of ₁ , Of ₂ , Of ₃ corresponding to each load for each output system on the secondary side;
When an overcurrent is detected, the sequence generation circuit 2
02, and the sequence generation circuit 202 controls the PWM (pulse width modulation) control circuit (o
A signal is sent to an (n / off control circuit) (control means) 206.

Thus, it is determined by the low voltage detection circuits (low voltage detection means) Ue and Uf whether the output voltage has dropped below the reference level for each output system, and if the output voltage has dropped, the sequence generation circuit 202 , The sequence generation circuit 202 sends a stop signal to the PWM control circuit 206 and shuts off only the drive system power supply system. In addition,
The PWM control circuit 206 performs pulse width modulation based on a signal from the voltage detection circuit 210 for preventing a high voltage.

Next, in the control system power supply system, transistors Tr ₁ and PWM (pulse width modulation) control circuit (control means)
The pulse voltage modulated by 205 is divided and transformed into three output systems by a transformer (power supply output dividing means) Ta, and diodes Da ₁ , Da ₂ , Db ₁ , Db ₂ , respectively.
Rectification and smoothing are performed by Dc ₁ , Dc ₂ , coils La, Lb, Lc, and electrolytic capacitors Ca, Cb, Cc for smoothing, thereby forming an output system of a 15 V, 12 V, 5 V DC power supply.

The power from the 5 V output system is supplied to the transistor Tr ₃ , the PWM control circuit 207, the diode D
3.3 V due to d, coil Ld and smoothing capacitor Cd
(The output system of the auxiliary power supply will be described later.) On the primary side, a total current excess detection circuit (overcurrent detection means) for monitoring the total amount of current flowing through each output system on the secondary side by detecting overcurrent on the primary side
203, and an overcurrent detection circuit (overcurrent detection means) O corresponding to each load for each output system on the secondary side
a, Ob, Oc ₁ , and Oc ₂ , each of which notifies the sequence generation circuit 202 when an overcurrent is detected, and the sequence generation 202 performs PWM so as to lower the output voltage.
(Pulse width modulation) control circuit (on / off control circuit)
(Control means) Sends a signal to 205. Similarly, in the 3.3 V output system, when an overcurrent is detected by the overcurrent detection circuit Od, a signal for lowering the output voltage by the PWM control circuit 207 is sent.

With this, it is determined by the low voltage detection circuits (low voltage detection means) Ua, Ub, Uc whether or not the output voltage has dropped below the reference level for each output system. The sequence generation circuit 202 notifies the circuit 202 of the drive system power supply system.
The configuration is such that a stop signal is output to the WM control circuit 206 and a stop signal is output to the PWM control circuit 205 so as to shut off the output of the control system power supply system with a certain time difference. In the 3.3 V output system, a stop signal is output to the PWM control circuit 207 by the low voltage detection circuit Ud so as to shut off the output of this output system. In addition, PW
The M control circuits 205 and 208 perform pulse width modulation based on signals from the voltage detection circuits 208 and 209, respectively, for preventing a high voltage.

With this configuration, when the overcurrent protection operates in the drive system power supply system, only the drive system power supply system is shut off, and when the overcurrent protection operates in the control system power supply system, the entire power supply system Is cut off, and even when an abnormality such as a short circuit occurs in the power supply unit 103 and in the load and the supply line to the load, the supply current is suppressed and the power supply unit and the load are caused by an excessive current flowing. Works to reduce stress on various elements and wiring materials. On the other hand, if an abnormality occurs in the control system power supply system, the control system power supply system is shut off, so that the load using both the control system and drive system power supplies such as motors and lamps is limited to the control system power supply system. It works to prevent load runaway caused by interruption.

Normally, power is supplied to the optional cassette deck 120 and sorter 122 via the diode Dma from the 24 V output system of the drive system power supply system.

When an abnormality occurs in the drive system power supply system or during a stop sequence, all output systems of the drive system power supply system are shut off.
Output smoothing choke coil Lc (number of turns N) connected in series between the cathode of ₁ , Dc ₂ and electrolytic capacitor Cc
The same number of turns of the choke coil Ls and the diode is superimposed on the output line of 5V by the configured multiple-turn choke coil Ds, the output system of 10V is an auxiliary power source which is obtained by the capacitor Cs _1, Cs ₂ in FIG. 1 and Diode D
Power is supplied only to the optional device so that control power can be generated by the optional device via sa.

Since the generated auxiliary power supply is synchronized with the operation of the control power supply system of the copying machine main body, problems such as communication errors can be solved.

Here, in FIG. 1, the diode Dm
Although a and Dsa are shown outside the power supply unit 103, they are usually arranged inside the power supply unit 103.

In this embodiment, the choke coil for generating the auxiliary power is a 5 V system to be controlled. However, other output systems may be used as long as they are control system power systems.

FIG. 3 shows the power supply operation to the optional cassette deck 120 and sorter 122, which are optional devices described above.
This will be described with reference to the flowchart of FIG. FIG. 3 is a flowchart showing an operation of supplying power to the optional device according to the present embodiment. This operation is performed by a CPU (not shown) by a program stored in a ROM (not shown).

First, in step S101, low voltage detection of each output system of the drive system power supply system is performed. Then, it is confirmed whether a low voltage is detected in step S102,
If a low voltage is not detected, power is supplied directly from the 24 V output system of the normal drive system power supply system. If a low voltage is detected, the process proceeds to step S103, where the output of the drive system power supply system is cut off, and at step S104 The auxiliary power is supplied from the 10 V output system of the control system power system.

As described above, in this embodiment, the overcurrent protection means and the low voltage detection means which are conventionally provided in the power supply unit are used, and the control system power supply system and the drive system power supply system perform switching control (independently). Power from the control system power supply system that is not normally supplied with power to the optional equipment by using the power supply only when the drive system power supply system is cut off. Since the voltage can be supplied, the control communication between the copying machine main body and the optional device is not interrupted, so that the communication failure and the accompanying malfunction can be eliminated.

[0049]

As described above, according to the present invention,
A plurality of power supply systems, power supply output dividing means for dividing power required for each load system of the main unit from the respective power supply systems into a plurality of output systems and supplying power to each of the plurality of output systems, and an overcurrent of each of the load systems. Overcurrent detection means for detecting, control means for controlling the output voltage of the power supply system so as to reduce the voltage of the output system when an overcurrent is detected by the overcurrent detection means, and the respective output systems Has a voltage drop detecting means for detecting when the voltage becomes equal to or less than a set value, and supplies power to the optional device of the main unit by an output system of a predetermined power system among the plurality of power systems. At the same time, when the voltage of any output system of the power supply system for supplying power to the optional device becomes lower than a set value, an auxiliary power supply is provided from an output system of a power supply system different from the predetermined power supply system. Due to so as to power the optional device can be secured for control power at the option device side, there is an effect that it is possible to prevent communication failure or malfunction with it the body.

Also, there are provided two switching power supply systems, a control system power supply system for supplying power to the control system load and a drive system power supply system for supplying power to the drive system load of the main unit. A power is supplied to the optional device from a predetermined output system of the power supply system, and an auxiliary power supply to the optional device is provided when an abnormality is detected in which the voltage of any one of the output systems of the drive power supply system is equal to or lower than a set value. Since the power is generated and supplied in the output smoothing coil unit of the predetermined output system of the control system power supply system so that the power is superimposed on the normal power supply output system, the normal output system is used, and There is an effect that an auxiliary power supply can be generated without affecting the output system.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a system configuration of a copying machine according to the present invention.

FIG. 2 is a circuit block diagram showing a configuration of a power supply unit in the copying machine of FIG.

FIG. 3 is a flowchart illustrating a power supply operation to an optional device according to an embodiment;

FIG. 4 is a block diagram showing a system configuration of a conventional copying machine.

FIG. 5 is a circuit block diagram showing a configuration of a power supply unit in the copying machine of FIG.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 copier main body 101 AC power supply 103 power supply section Dsa diode Dma diode D _{1 to} D ₄ diode C ₁ smoothing capacitor 202 sequence generation circuit 203 overcurrent detection circuit (overcurrent detection means) 204 overcurrent detection circuit (overcurrent detection means) ) 205 PWM control circuit (control means) 206 PWM control circuit (control means) Tr ₁ to Tr ₃ transistor Oa overcurrent detection circuit (overcurrent detection means) Ob overcurrent detection circuit (overcurrent detection means) Oc _1, Oc ₂ overcurrent detection circuit (overcurrent detection means) Od overcurrent detection circuit (overcurrent detection means) Oe _1, Oe ₂ overcurrent detection circuit (overcurrent detection means) Of ₁ ~Of ₃ overcurrent detection circuit (overcurrent detection means Ua to Uf Low voltage detection circuit (low voltage detection means)

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) FV04 XC07 XX13 XX15 XX22 XX23 XX33 XX35 XX42

Claims (8)

[Claims] 1. A power supply device mountable on a main unit, comprising: a plurality of power supply systems; and a power supply required for each load system of the main unit divided from the respective power supply systems into a plurality of output systems to supply power. Power supply output dividing means, an overcurrent detecting means for detecting an overcurrent of each load system, and an overcurrent detecting means for reducing the voltage of the output system when the overcurrent is detected by the overcurrent detecting means. Control means for controlling the output voltage of the power supply system, and voltage drop detection means for detecting when the voltage of each of the output systems becomes equal to or less than a set value; The power supply to the optional device of the main unit is supplied by the output system of the predetermined power supply system, and the voltage of any output system of the power supply system for supplying power to the optional device becomes abnormal when the voltage of the output system becomes lower than a set value. A power supply device, wherein power is supplied to the optional device as auxiliary power from an output system of a power supply system different from the power supply system. 2. A switching power supply system comprising: a control system power supply system for supplying power to a control system load of the main unit; and a drive system power supply system for supplying power to a drive system load of the main unit. While supplying power to the optional device from a predetermined output system of the drive system power supply system, and when the voltage of one of the output systems of the drive power supply system is detected to be equal to or less than a set value, an abnormality is supplied to the optional device. 2. The power supply device according to claim 1, wherein an auxiliary power supply is generated and supplied to an output smoothing coil unit of a predetermined output system of the control system power supply system, so that power is superimposed on a normal power supply output system. . 3. A method for controlling a power supply device mountable on a main unit, comprising: a power supply for dividing a power supply required for each load system of the main unit from a plurality of power supply systems into a plurality of output systems and supplying power to each of the plurality of output systems. The output is divided, and when an overcurrent is detected by the overcurrent detection means for detecting the overcurrent of each of the load systems, the output voltage of the power system is controlled so as to drop the voltage of the output system. Power is supplied to the optional device of the main unit by the output system of the predetermined power system of the power system, and the voltage of any output system of the power system for supplying power to the optional device is lower than a set value. A power supply unit that supplies power to the optional device as an auxiliary power from an output system of a power supply system different from the predetermined power supply system when an abnormality is detected by the voltage drop detection unit. Control method. 4. A switching power supply system comprising: a control system power supply system for supplying power to a control system load of the main unit; and a drive system power supply system for supplying power to a drive system load of the main unit. While supplying power to the optional device from a predetermined output system of the drive system power supply system, and when the voltage of one of the output systems of the drive power supply system is detected to be equal to or less than a set value, an abnormality is supplied to the optional device. 4. The power supply device according to claim 3, wherein an auxiliary power supply is generated and supplied to an output smoothing coil unit of a predetermined output system of the control system power supply system, so that power is superimposed on a normal power supply output system. Control method. 5. A power supply output dividing means for dividing a plurality of power supply systems, a power supply required for each load system of the image recording apparatus main body from each of the power supply systems into a plurality of output systems, and supplying power to each of the plurality of output systems. Overcurrent detection means for detecting overcurrent of the load system, and control means for controlling the output voltage of the power supply system so as to reduce the voltage of the output system when the overcurrent is detected by the overcurrent detection means. And a voltage drop detecting means for detecting when the voltage of each of the output systems falls below a set value, wherein the image recording is performed by an output system of a predetermined power system among the plurality of power systems. In addition to supplying power to the optional device of the device main body, in the event of an abnormality in which the voltage of one of the output systems of the power supply system for supplying power to the optional device has fallen below a set value, a power supply system different from the predetermined power supply system An image recording apparatus for supplying power to the optional device as an auxiliary power from an output system. 6. A switching power supply system for supplying power to a control system load of the image recording apparatus main body and a drive system power supply system for supplying power to a drive system load of the image recording apparatus main body. In general, power is supplied to an optional device from a predetermined output system of the drive system power system, and the abnormality is detected when the voltage of any output system of the drive system is detected to be equal to or lower than a set value. 6. An auxiliary power supply for an optional device is generated and supplied to an output smoothing coil unit of a predetermined output system of the control system power supply system, so that power is superimposed on a normal power supply output system. The image recording apparatus as described in the above. 7. A power supply required for each load system of the image recording apparatus main body is divided into a plurality of output systems from a plurality of power supply systems and divided into a plurality of power supply outputs for supplying power, and an overcurrent of each load system is detected. When an overcurrent is detected by the overcurrent detection means, the output voltage of the power supply system is controlled so as to reduce the voltage of the output system, and the output voltage of a predetermined power supply system of the plurality of power supply systems is controlled by the output system. Power is supplied to the optional device of the image recording apparatus main body, and at the time of abnormality detected by voltage drop detecting means that the voltage of any output system of the power supply system for supplying power to the optional device has become equal to or less than a set value. A method for controlling an image recording apparatus, comprising: supplying power to an optional device as an auxiliary power from an output system of a power system different from the predetermined power system. 8. A control system power supply system for supplying power to a control system load of the image recording apparatus main body and a drive system power supply system for supplying power to a drive system load of the image recording apparatus main body.
While supplying power to the optional device from a predetermined output system of the drive system power system of the two switching power systems, it has been detected that the voltage of any output system of the drive power system is equal to or less than a set value. In the event of an abnormality, an auxiliary power supply to the optional device is generated and supplied to an output smoothing coil unit of a predetermined output system of the control system power supply system, so that power is superimposed on a normal power supply output system. A method for controlling an image recording apparatus according to claim 7.