KR102359118B1 - Apparatus for controlling power of coil - Google Patents

Abstract

A coil power supply control device is disclosed. A coil power control device according to an aspect of the present invention includes a PWM signal generator for generating a PWM (Pulse Width Modulation) signal with a voltage supplied from a power supply, and an amplifier for amplifying a PWM signal input from the PWM signal generator. , a switching unit switching according to the PWM signal input from the amplifying unit to apply a current to the coil, and a duty control unit controlling the duty of the PWM signal based on the voltage supplied from the power supply unit.

Description

Coil power control device {APPARATUS FOR CONTROLLING POWER OF COIL}

The present invention relates to a coil power control device, and more particularly, to a coil power control device for adjusting a PWM (Pulse Width Modulation) duty according to a voltage applied to a coil of a solenoid valve or a relay.

Generally, solenoid valves are installed in pipelines or containers of fluids such as water, oil, gas, air, and steam, and are used to intermittently or convert the flow of fluid or to control the flow rate.

A solenoid valve is a device that combines a coil made by winding a coil around a fixed iron core in a cylindrical shape and a moving iron core sucked into the coil. It is configured to allow the moving iron core and the plunger to be sucked into the coil by flowing a current through the coil, or to be moved to the original position by the elastic force of the restoration spring, so that the flow path can be opened and closed by controlling the vertical movement of the plunger coupled to the movable iron core.

On the other hand, the relay is an electrical component that regulates the flow of current. A relay is a device that controls the flow of a high-voltage current for operating a load by intermitting the flow of a low-voltage current signal. That is, the relay mounts a coil inside a yoke made of an iron core and installs a movable armature in the yoke. When a low current is applied to the coil, the movable armature moves by the magnetic force formed in the coil and selectively connects the contact terminals of the current. It is a device designed to regulate the flow of current by controlling the current by giving it.

The background technology of the present invention is disclosed in 'Relay coil control circuit diagnosis apparatus and method' of Republic of Korea Patent Publication No. 10-2016-0055647 (2016.05.18).

Conventionally, a large amount of current is applied to a coil of a relay or solenoid valve to contact an electromagnet, and then the current is reduced by using a resistance.

However, in the conventional method, heat generation of the resistor is not large when the current is small because the capacity of the coil is small, but when the capacity of the coil is large, the heat of the resistor is increased, thereby reducing efficiency and durability. In addition, since the same PWM duty is generated even when the voltage is increased by generating a constant PWM duty after a predetermined time after the initial driving of the solenoid valve or relay, power efficiency is not good.

The present invention has been devised to improve the above problems, and an object of one aspect of the present invention is to provide a coil power control device for adjusting PWM duty according to a voltage applied to a coil of a solenoid valve or a relay.

A coil power control device according to an aspect of the present invention includes a PWM signal generator for generating a PWM (Pulse Width Modulation) signal with a voltage supplied from a power supply, and an amplifier for amplifying a PWM signal input from the PWM signal generator. , a switching unit switching according to the PWM signal input from the amplifying unit to apply a current to the coil, and a duty control unit controlling the duty of the PWM signal based on the voltage supplied from the power supply unit.

In the present invention, the PWM signal generator is a multivibrator, and a first resistor (R1), a second resistor (R2), a first capacitor (C1), and a second capacitor for adjusting a time constant of the multivibrator (C2) may be included.

In the present invention, the amplifying unit includes a third resistor, a fourth resistor, and a first transistor, and the third resistor has one end connected to the power supply and the other end connected to the first transistor, and the fourth resistor is One end is connected to the output terminal of the PWM signal generator and the other end is connected to the first transistor, and the first transistor has an emitter terminal connected to ground, a base terminal connected to the fourth resistor, and a collector terminal connected to the third resistor. and the switching unit.

In the present invention, the switching unit may include a second transistor having a collector terminal connected to the coil, an emitter terminal connected to ground, and a base terminal connected to the amplifier unit.

In the present invention, the duty control unit includes a Zener diode (ZD1) and a sixth resistor (R6), and the Zener diode has one end connected to a point where the first resistor and the first capacitor of the PWM signal generator meet, and the other end is It may be connected to the sixth resistor, and one end of the sixth resistor may be connected to the Zener diode and connected to the PWM signal generator.

In the present invention, the duty control unit further includes a third capacitor C3 for delaying the operation of the Zener diode ZD1, the third capacitor having one end connected to the sixth resistor and the Zener diode, and the other end connected to the third capacitor. It can be connected to ground.

In the present invention, the duty control unit may compare the voltage supplied from the power supply unit with the voltage of the Zener diode, and adjust the duty of the PWM signal according to the comparison result.

A coil power control device according to another aspect of the present invention includes a PWM signal generating unit for generating a PWM (Pulse Width Modulation) signal with a voltage supplied from a power supply unit, and an amplifying unit for amplifying a PWM signal input from the PWM signal generating unit. , a switching unit for applying a current to the coil by being switched according to the PWM signal input from the amplifying unit, a driving unit for switching and controlling the power supplied from the power supply unit to drive the coil, and supplying power to the coil through the driving unit After a preset time has elapsed, a current control unit for reducing the current flowing through the coil through the driving unit by turning off the driving unit, and controlling the duty of the PWM signal based on the voltage supplied from the power supply unit It includes a duty control.

In the present invention, the PWM signal generator is a multivibrator, and a first resistor (R1), a second resistor (R2), a first capacitor (C1), and a second capacitor for adjusting a time constant of the multivibrator (C2) may be included.

In the present invention, the duty control unit includes a Zener diode ZD1 and a sixth resistor R6, and the Zener diode has one end connected to a point where the first resistor and the first capacitor of the PWM signal generator meet, and the other end of the Zener diode. It may be connected to the sixth resistor, and one end of the sixth resistor may be connected to the Zener diode and connected to the PWM signal generator.

In the present invention, the duty control unit further includes a third capacitor C3 for delaying the operation of the Zener diode ZD1, the third capacitor having one end connected to the sixth resistor and the Zener diode, and the other end connected to the third capacitor. It can be connected to ground.

In the present invention, the duty control unit may compare the voltage supplied from the power supply unit with the voltage of the Zener diode, and adjust the duty of the PWM signal according to the comparison result.

In the present invention, the driving unit includes a seventh resistor and a third transistor, the seventh resistor has one end connected to the power supply and the other end connected to the third transistor, and the third transistor has a collector end connected to the coil When connected to and the emitter terminal is connected to the ground, the base terminal may be connected to the third resistor.

In the present invention, the current controller includes an eighth resistor, a fourth capacitor, and a fourth transistor, and the eighth resistor has one end connected to the power supply and the other end connected to the fourth transistor, and the fourth transistor A collector terminal is connected to the driver, an emitter terminal is connected to the ground, a base terminal is connected to the eighth resistor, and the fourth capacitor has one end connected to the ground and the other end of the fourth resistor and the fourth transistor. It may be connected between the base ends.

The coil power control apparatus according to an aspect of the present invention may increase power efficiency by adjusting the PWM duty according to a voltage applied to a coil of a solenoid valve or a relay.

The coil power control device according to an aspect of the present invention generates a duty according to the voltage in response to a case in which the voltage is high when the battery is fully charged and the voltage is decreased as the battery is discharged according to the state of the battery, so that the higher the voltage, the higher the duty is. The same torque can be generated by dropping the

In the coil power control apparatus according to an aspect of the present invention, the operation efficiency can be increased by reducing the PWM duty with respect to a voltage increase applied to the coil of the solenoid valve or relay to maintain the same power.

1 is a circuit diagram of a coil power control apparatus according to an embodiment of the present invention.
2 is a circuit diagram of a coil power control apparatus according to another embodiment of the present invention.
3 is a view showing a simulation result of a coil power control apparatus according to an embodiment of the present invention.

Hereinafter, a coil power control apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, definitions of these terms should be made based on the content throughout this specification.

1 is a circuit diagram of a coil power control apparatus according to an embodiment of the present invention.

Referring to FIG. 1 , a coil power control apparatus according to an embodiment of the present invention includes a power supply unit 10 , a PWM signal generator 30 , an amplifier 40 , a switching unit 50 , and a duty control unit 60 . may include

The power supply unit 10 may supply power.

The coil 20 may be any electrical component driven by the coil 20 . The electrical component may include a solenoid valve installed in a fluid conduit or container to control or change the flow of the fluid or control the flow rate or a relay to control the flow of current. The electric component driven by the coil 20 is not limited to the above-described solenoid valve or relay.

Reference numeral R5 not described in FIG. 1 may indicate an internal resistance of the coil 20 .

The PWM signal generating unit 30 may generate a PWM (Pulse Width Modulation) signal with the power supplied from the power supply unit 10 and input it to the amplifying unit 40 .

As the PWM signal generator 30 , a multivibrator including a first resistor R1 , a second resistor R2 , a first capacitor C1 , and a second capacitor C2 may be employed. The multivibrator may adjust the frequency by adjusting the capacitance of a capacitor provided therein, or may adjust the duty cycle by changing the resistance. Specifically, the PWM signal generator 30 may determine the PWM duty cycle according to the ratio of the first resistor R1 and the second resistor R2 . When the first resistor R1 is larger than the second resistor R2 , the PWM duty cycle is reduced, and the PWM duty cycle is inverted by the first transistor Q1 to increase the PWM duty cycle in Q2 . The multivibrator may adjust the frequency by adjusting the capacitance of a capacitor provided therein, or may adjust the duty cycle by changing the resistance.

The PWM signal generator 30 is not limited to the above-described multivibrator. Any element or circuit capable of generating a PWM signal may be employed as the PWM signal generating unit 30 .

The amplifying unit 40 may amplify the PWM signal input from the PWM signal generating unit 30 .

The amplifier 40 may include a third resistor R3 , a fourth resistor R4 , and a first transistor Q1 .

The third resistor R3 may have one end connected to the power supply unit 10 and the other end connected to the collector of the first transistor Q1 .

The fourth resistor R4 may have one end connected to the output terminal of the PWM signal generator 30 and the other end connected to the first transistor Q1 .

The first transistor Q1 may have an emitter terminal connected to the ground, a base terminal connected to the fourth resistor R4 , and a collector terminal connected to the third resistor R3 and the switching unit 50 .

The first transistor Q1 is turned off according to the PWM signal input through the fourth resistor R4, and at this time, the PWM signal is level-shifted by the third resistor R3 to be input to the PWM signal generator 30. have. That is, the PWM signal input to the base terminal of the first transistor Q1 may be amplified with the same duty and input to the switching unit 50 .

The switching unit 50 may be switched according to the PWM signal input from the amplifying unit 40 to apply a current to the coil 20 .

The switching unit 50 may include a second transistor Q2 having a collector terminal connected to the coil 20 , an emitter terminal connected to the ground, and a base terminal connected to the amplifier unit 40 .

That is, the second transistor Q2 is turned on according to a signal input from the amplifier 40 to allow a current to flow through the coil 20 .

The amount of current flowing through the switching unit 50 may be determined according to the PWM signal of the PWM signal generating unit 30 . The amount of current flowing through the switching unit 50 may be a level of current capable of maintaining the operation of the coil 20 .

The duty control unit 60 may control the duty of the PWM signal based on the voltage VDD supplied from the power supply unit 10 .

The duty control unit 60 may include a Zener diode ZD1 and a sixth resistor R6 .

The Zener diode ZD1 may have one end connected to the first resistor R1 for adjusting the time constant of the PWM signal generator 30 , and the other end connected to the sixth resistor R6 . In this case, the Zener diode ZD1 may be connected to a point where the first resistor R1 and the first capacitor C1 of the PWM signal generator 30 meet.

The sixth resistor R6 may have one end connected to the Zener diode ZD1 and the other end connected to the PWM signal generator 30 .

In the circuit configured as described above, when the voltage VDD of the power supply unit 10 is higher than the voltage of the Zener diode ZD1 , a current may flow toward the Zener diode ZD1 through the sixth resistor R6 . When a current flows toward the Zener diode ZD1, the first resistor R1 of the PWM signal generator 30 and the sixth resistor R6 of the duty controller 60 are combined in parallel connection, and thus the first resistor The resistance value on the (R1) side may become small. When the first resistor R1 of the PWM signal generator 30 is greater than the second resistor R2, the PWM duty cycle is reduced, inverted by the first transistor Q1, and the duty cycle is applied to the second transistor Q2. this will get bigger

The duty control unit 60 adjusts the PWM duty cycle according to the voltage VDD of the power supply unit 10, so that the duty can be input large when the initial voltage supplied from the voltage supply unit is low, and the voltage supplied from the voltage supply unit is The higher the value, the smaller the duty.

On the other hand, when the coil power control device is initially driven, a large force is required to increase the power efficiency of the coil 20, thereby increasing the power by increasing the PWM duty, and when the coil 20 (relay) is attached The PWM duty should be lowered. However, when the zener diode ZD1 is operated when the initial voltage is applied, the PWM duty becomes small instead of maximally increased. For this reason, it is necessary to delay the operation of the Zener diode ZD1 when the coil power control device is initially driven.

Accordingly, the duty control unit 60 according to the embodiment of the present invention may further include a third capacitor C3 for delaying the operation of the Zener diode ZD1.

The third capacitor C3 may have one end connected to the sixth resistor R6 and the Zener diode ZD1 and the other end connected to the ground.

When power is supplied by the power supply unit 10 , energy may be charged in the third capacitor C3 . Thereafter, when the energy of the third capacitor C3 increases enough to operate the Zener diode ZD1 , the Zener diode ZD1 may operate.

When a large power is needed during the initial driving of the coil power control device through the duty control unit 60 configured as described above, the power can be increased by increasing the PWM duty, and when the coil 20 is attached, the PWM duty is lowered. Power efficiency can be improved. That is, by applying a strong force when the specimen moves during the initial coil driving and applying a weak force after a predetermined time, energy can be saved.

2 is a circuit diagram of a coil power control apparatus according to another embodiment of the present invention.

Referring to FIG. 2 , a coil power control apparatus according to another embodiment of the present invention includes a power supply unit 10 , a PWM signal generator 30 , an amplifier 40 , a switching unit 50 , and a duty control unit 60 . , a driving unit 70 and a current adjusting unit 80 may be included.

The power supply unit 10 , the PWM signal generation unit 30 , the amplification unit 40 , the switching unit 50 , and the duty control unit 60 are the power supply unit 10 and the PWM signal generation unit 30 shown in FIG. 1 . ), the amplification unit 40 , the switching unit 50 , and the duty control unit 60 perform the same operations, so a description thereof will be omitted.

The amount of current flowing through the switching unit 50 is determined according to the PWM signal of the PWM signal generating unit 30 . The amount of current flowing through the switching unit 50 is at a level capable of maintaining the operation of the coil 20 , and may be relatively small compared to the amount of current flowing by the driving unit 70 .

The driving unit 70 may drive the coil 20 by supplying current to the coil 20 through switching control of the power supplied from the power supply unit 10 .

The amount of current flowing through the coil 20 by the driving unit 70 is relatively larger than the amount of current flowing through the coil 20 by the above-described switching unit 50 .

The driving unit 70 may be disposed in parallel with the PWM signal generating unit 30 and the switching unit 50 to be connected to the coil 20 .

The driver 70 may include a seventh resistor R7 and a third transistor Q3 .

The seventh resistor R7 may have one end connected to the power supply unit 10 and the other end connected to the base terminal of the third transistor Q3 .

The third transistor Q3 may have a collector terminal connected to the coil 20 , an emitter terminal connected to ground, and a base terminal connected to the seventh resistor R7 .

The third transistor Q3 is turned on by the power supplied through the power supply unit 10 so that a current flows through the coil 20 .

That is, during the initial operation of the power supply unit 10 , the driving unit 70 , the PWM signal generating unit 30 , the amplifying unit 40 , and the switching unit 50 are each driven to flow a current to the coil 20 and the solenoid valve Or the relay will operate.

An electric component operated by the coil 20, for example, a solenoid valve or a relay operates as an electromagnet. Therefore, a relatively large amount of current is required to electrically connect them. However, after the armatures are in contact with each other, the contact state can be maintained even with an amount of current that is relatively smaller than the amount of current required initially.

The current control unit 80 supplies current to the coil 20 through the driving unit 70 and then turns off the driving unit 70 when a preset time has elapsed to flow through the coil 20 through the driving unit 70 . current can be reduced.

The current controller 80 may include an eighth resistor R8 , a fourth capacitor C4 , and a fourth transistor Q4 .

The eighth resistor R8 may have one end connected to the power supply unit 10 and the other end connected to the base terminal of the fourth transistor Q4 .

The fourth transistor Q4 may have a collector terminal connected to the driver 70 , an emitter terminal connected to the ground, and a base terminal connected to the eighth resistor R8 .

The fourth capacitor C4 may have one end connected to the ground and the other end connected between the eighth resistor R8 and the base terminal of the fourth transistor Q4.

When power is supplied by the power supply unit 10 , energy may be charged in the fourth capacitor C4 . Thereafter, when the energy of the fourth capacitor C4 increases enough to turn on the fourth transistor Q4 , the fourth transistor Q4 may be turned on.

As the fourth transistor Q4 is turned on, the third transistor Q3 may be turned off. Accordingly, no current flows through the third transistor Q3 , and as a result, the amount of current flowing through the coil 20 is reduced to the amount of current flowing through the switching unit 50 .

That is, when power is supplied by the power supply unit 10 , a relatively large current required to start the operation of the corresponding electric component flows through the coil 20 , and thereafter, for a set time, for example, the fourth capacitor C4 is applied to the fourth capacitor C4 . When the amount of energy sufficient to turn off the transistor Q4 has elapsed, a current necessary for the operation of the electrical component flows.

Meanwhile, the PWM signal generator 30 may set the duty ratio of the PWM signal in various ways. For example, if the operating point of the coil 20 is 5V, an input voltage of 12V may be applied.

The PWM signal generator 30 operates at a high speed in the initial stage of operation, but may reduce the PWM duty cycle by changing the internal resistance. That is, the PWM signal generator 30 can maintain the average voltage after operating the coil 20 by controlling the duty ratio, thereby stably operating the electric component without damage to the coil 20 .

3 is a view showing a simulation result of a coil power control apparatus according to an embodiment of the present invention.

Referring to FIG. 3 , it can be seen that when the coil power control device is initially driven, the PWM duty is high, and when the coil (relay) is maintained, the PWM duty is decreased.

Through this, when a large power is required for initial driving of the coil power control device, the power can be increased by increasing the PWM duty, and when the coil is attached, the power efficiency can be increased by lowering the PWM duty. That is, by applying a strong force when the specimen moves during the initial coil driving and applying a weak force after a predetermined time, energy can be saved.

As described above, the coil power control apparatus according to an aspect of the present invention can increase power efficiency by adjusting the PWM duty according to the voltage applied to the coil of the solenoid valve or relay.

The coil power control device according to an aspect of the present invention generates a duty according to the voltage in response to a case in which the voltage is high when the battery is fully charged and the voltage is decreased as the battery is discharged according to the state of the battery, so that the higher the voltage, the higher the duty is. The same torque can be generated by dropping the

In the coil power control apparatus according to an aspect of the present invention, the operation efficiency can be increased by reducing the PWM duty with respect to a voltage increase applied to the coil of the solenoid valve or relay to maintain the same power.

The coil power control apparatus according to an embodiment of the present invention can reduce power loss and heat generation of the solenoid valve or relay by adjusting the current flowing through the coil of the solenoid valve or relay.

Implementations described herein may be implemented in, for example, a method or process, an apparatus, a software program, a data stream, or a signal. Although discussed only in the context of a single form of implementation (eg, discussed only as a method), implementations of the discussed features may also be implemented in other forms (eg, as an apparatus or program). The apparatus may be implemented in suitable hardware, software and firmware, and the like. A method may be implemented in an apparatus such as, for example, a processor, which generally refers to a computer, a microprocessor, a processing device, including an integrated circuit or programmable logic device, and the like. Processors also include communication devices such as computers, cell phones, portable/personal digital assistants (“PDA”) and other devices that facilitate communication of information between end-users.

Although the present invention has been described with reference to the embodiment shown in the drawings, this is merely exemplary, and it is understood that various modifications and equivalent other embodiments are possible by those of ordinary skill in the art. will understand Therefore, the true technical protection scope of the present invention should be defined by the following claims.

10: power supply
20: coil
30: PWM signal generator
40: amplification unit
50: switching unit
60: duty control unit
70: drive unit
80: current control unit

Claims (14)

a PWM signal generator for generating a PWM (Pulse Width Modulation) signal with the voltage supplied from the power supply;
an amplifying unit amplifying the PWM signal input from the PWM signal generating unit;
a switching unit which is switched according to the PWM signal input from the amplifying unit to apply a current to the coil; and
A duty control unit for controlling the duty of the PWM signal based on the voltage supplied from the power supply unit,
The PWM signal generator,
A multivibrator, the coil power control device comprising a first resistor, a second resistor, a first capacitor, and a second capacitor for adjusting the time constant of the multivibrator.
delete According to claim 1,
The amplification unit,
a third resistor;
a fourth resistor; and
comprising a first transistor;
The third resistor has one end connected to the power supply and the other end connected to the first transistor,
The fourth resistor has one end connected to the output terminal of the PWM signal generator and the other end connected to the first transistor,
The first transistor has an emitter terminal connected to the ground, a base terminal connected to the fourth resistor, and a collector terminal connected to the third resistor and the switching unit.
According to claim 1,
The switching unit,
and a second transistor having a collector terminal connected to the coil, an emitter terminal connected to ground, and a base terminal connected to the amplifier.
According to claim 1,
The duty control unit,
Zener diode (ZD1); and
a sixth resistor;
One end of the Zener diode is connected to a point where the first resistor and the first capacitor of the PWM signal generator meet, and the other end is connected to the sixth resistor,
The sixth resistor has one end connected to the Zener diode, and is connected in parallel to the first resistor and the second resistor of the PWM signal generator.
6. The method of claim 5,
The duty control unit,
Further comprising a third capacitor (C3) for delaying the operation of the Zener diode (ZD1),
The third capacitor has one end connected to the sixth resistor and the Zener diode, and the other end connected to the ground.
6. The method of claim 5,
The duty control unit,
The coil power control device, characterized in that the voltage supplied from the power supply is compared with the voltage of the Zener diode, and the duty of the PWM signal is adjusted according to the comparison result.
a PWM signal generator for generating a PWM (Pulse Width Modulation) signal with the voltage supplied from the power supply;
an amplifying unit amplifying the PWM signal input from the PWM signal generating unit;
a switching unit which is switched according to the PWM signal input from the amplifying unit to apply a current to the coil;
a driving unit for switching the power supplied from the power supply unit to drive the coil;
a current control unit for reducing the current flowing through the coil through the driving unit by turning off the driving unit when a preset time elapses after supplying power to the coil through the driving unit; and
A duty control unit for controlling the duty of the PWM signal based on the voltage supplied from the power supply unit,
The PWM signal generator,
A multivibrator, the coil power control device comprising a first resistor, a second resistor, a first capacitor, and a second capacitor for adjusting the time constant of the multivibrator.
delete 9. The method of claim 8,
The duty control unit,
Zener diode (ZD1); and
a sixth resistor;
One end of the Zener diode is connected to a point where the first resistor and the first capacitor of the PWM signal generator meet, and the other end is connected to the sixth resistor,
The sixth resistor has one end connected to the Zener diode, and is connected in parallel to the first resistor and the second resistor of the PWM signal generator.
11. The method of claim 10,
The duty control unit,
Further comprising a third capacitor (C3) for delaying the operation of the Zener diode (ZD1),
The third capacitor has one end connected to the sixth resistor and the Zener diode, and the other end connected to the ground.
12. The method of claim 11,
The duty control unit,
The coil power control device, characterized in that the voltage supplied from the power supply is compared with the voltage of the Zener diode, and the duty of the PWM signal is adjusted according to the comparison result.
9. The method of claim 8,
the driving unit
a seventh resistor; and
a third transistor,
The seventh resistor has one end connected to the power supply and the other end connected to the third transistor,
The third transistor has a collector terminal connected to the coil, an emitter terminal connected to ground, and a base terminal connected to the seventh resistor.
9. The method of claim 8,
The current control unit
eighth resistance;
a fourth capacitor; and
comprising a fourth transistor;
The eighth resistor has one end connected to the power supply and the other end connected to the fourth transistor,
The fourth transistor has a collector terminal connected to the driver, an emitter terminal connected to ground, and a base terminal connected to the eighth resistor,
The fourth capacitor has one end connected to the ground and the other end connected between the eighth resistor and the base end of the fourth transistor.

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