KR101854089B1 - Variable voltage stable power supply and method for controlling thereof - Google Patents

Variable voltage stable power supply and method for controlling thereof Download PDF

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Publication number
KR101854089B1
KR101854089B1 KR1020170143543A KR20170143543A KR101854089B1 KR 101854089 B1 KR101854089 B1 KR 101854089B1 KR 1020170143543 A KR1020170143543 A KR 1020170143543A KR 20170143543 A KR20170143543 A KR 20170143543A KR 101854089 B1 KR101854089 B1 KR 101854089B1
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South Korea
Prior art keywords
voltage
unit
power
phase
output
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KR1020170143543A
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Korean (ko)
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이중오
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이중오
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/42—Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors, or choke coils
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
    • H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Inverter Devices (AREA)

Abstract

The present invention relates to an electric variable device for preventing a voltage rise and a control method thereof, and more particularly, to an electric variable device for preventing a voltage from rising Phase alternating-current power supply connected in parallel with the rectifying unit and converting the input three-phase alternating-current power into direct current and outputting the direct-current power to the spare power supply unit; a blocking diode provided between the rectifying unit and the spare power supply unit to prevent a current passing through the rectifying unit from flowing to the spare power supply unit Phase alternating-current power supply for outputting a direct current and / or a direct-current output from the spare power supply unit, which is connected in series to the rectifying unit and has passed through the rectifying unit, Phase alternating current power source and detects the voltage of the three-phase alternating current power source Phase alternating-current power from the first voltage sensing unit to the three-phase alternating-current power source when the voltage of the three-phase alternating-current power source is higher than a threshold value, And outputs the converted output signal.

Description

TECHNICAL FIELD [0001] The present invention relates to an electric variable device for preventing a voltage rise and a control method thereof,

The present invention relates to an electric variable device for preventing a voltage rise and a control method thereof, and more particularly, to an electric variable device for providing a stable voltage even if a voltage rise occurs at an input terminal of a three- .

Generally, the performance is determined depending on whether a stable voltage can be supplied for a long time so that the electric device (semiconductor, display equipment, robot, or the like) on the output side is not overloaded even if a voltage higher than 200% do. That is, it is necessary to control the stable power supply so that the electric device can be operated for a long period of time in a state in which the parts are damaged due to an excessive voltage rise or the controller is not broken down.

An example of such a variable voltage stabilizer is the uninterruptible power supply (UPS), which is widely known to protect electronic equipment through uninterruptible power supply when power supply interruption such as a power failure occurs.

However, since the UPS is focused on protecting the circuit when the voltage is lowered or the power supply is cut off, if the overvoltage is inputted over a certain level, it may not work properly, which may cause serious damage to the electric device. In particular, when the voltage of the three-phase power source is increased, even if the voltage that has already flowed into the rectifying part is cut off by the operation method of the conventional UPS, the voltage of the rectifying part abnormally increases according to the cut- There is a problem in the internal pressure of the device and the transformer.

SUMMARY OF THE INVENTION The present invention is conceived to solve the above-described problems, and it is an object of the present invention to provide a voltage control apparatus and a voltage control method thereof, in which a high voltage is input using a voltage sensor provided at the input of a rectification section, and a silicon controlled controlled rectifier (SCR) And an object thereof is to provide a voltage rising prevention electric variable device capable of supplying a stable voltage to a load side for a long period of time in the same manner as usual.

In order to achieve the above-described object, the present invention provides a plasma display apparatus comprising: a first voltage sensing unit provided between an external power supply side to which a three-phase AC power is input and a power supply line that connects an AC power supply to a rectification unit side; Phase alternating-current power source to a DC power source and outputting the DC-converted AC power to a spare power source unit; a blocking diode provided between the rectifying unit and the spare power source unit to prevent a current passing through the rectifying unit from flowing to the spare power source unit; An inverter that is connected in series to the rectifying unit and converts the direct current passed through the rectifying unit and / or the direct current output from the spare power source unit into a three-phase AC power for output and outputs the output; Phase AC power supply, and when the output of the three-phase AC power supply for output is kept constant Phase AC power source when the voltage of the three-phase AC power source sensed by the first voltage sensing unit rises above a threshold value; and a control unit for interrupting the input of the three- Phase alternating-current power for output and outputting the converted direct current to the output three-phase alternating-current power supply.

According to an aspect of the present invention, the voltage rising prevention electrical variable device includes a silicon controlled rectifier (SCR) switch formed of a silicon controlled rectifying element between the external power supply side and the rectifying part, Phase AC voltage is increased by a predetermined value or more, the switch may be opened to cut off the input of the three-phase AC voltage.

According to another aspect of the present invention, the SCR switch may be provided for three-phase (R, S, T) power lines receiving three-phase AC power.

According to another aspect of the present invention, the logic controller controls the SCR switch to block the input of the three-phase AC voltage when the voltage sensed by the first voltage sensing unit exceeds 10% of the normal input voltage, When the input voltage does not exceed 10% of the input voltage, the inverter control unit controls the pulse width to control the output voltage to be constant.

According to still another aspect of the present invention, the logic controller is configured to control the inverter to operate in an inverter abnormal operation, an overload of an output AC voltage, a DC voltage output from the spare power supply is low, or a temperature overheat of the electrically variable device is detected, The alternating current power can be controlled so that the electric variable device is directly outputted by bypassing.

According to another aspect of the present invention, the first voltage sensing unit may include an input transformer, and the input transformer may be configured as an H type dry type to supply a constant voltage to the charging unit.

According to another aspect of the present invention, the second voltage sensing unit includes an output transformer, and the output transformer may include a leakage reactance component to minimize a high-frequency component.

According to another aspect of the present invention, the electrically variable device may include a stop switch composed of a pure semiconductor device to prevent the inverter from operating in an abnormal state or preventing an inrush rectification that occurs when an overload occurs.

In accordance with another aspect of the present invention, there is provided a method of controlling an electrical variable device for preventing an increase in voltage, the method comprising: receiving a three-phase AC power from an external power source; Converting the input AC power to DC and reconverting the converted DC power to a three-phase AC power for output if the voltage of the input three-phase AC power is within a threshold value; Phase alternating-current power supply, and when the voltage of the input three-phase alternating-current power supply exceeds a threshold value, disconnecting the input alternating-current power supply and converting the direct-current power supplied from the spare power supply unit to a three- And a step of outputting the electric variable device control method.

According to an aspect of the present invention, the step of disconnecting the AC power supply includes a silicon controlled rectifier (SCR) composed of a silicon control rectifier installed in each of the three-phase (R, S, T) The switch can be used to shut off the current in a steady state.

According to the voltage rising prevention electric variable device and the control method therefor, it is possible to control not only the case where the input AC power is cut off, the voltage is lowered, but also the rated AC power is outputted stably even when the voltage rises.

Particularly, by controlling the voltage rise by arranging the SCR switch composed of the silicon control element and the high withstand voltage at the front end of the rectification part, even if the voltage exceeding twice the design voltage is inputted, can do.

1 shows an equivalent circuit of an electrically variable device according to an embodiment of the present invention;
Fig. 2 shows an equivalent circuit of an electrically variable device according to another embodiment of the present invention. Fig.
3 is a diagram illustrating a detailed circuit of an electrically variable device according to one embodiment of the present invention.
4 is a diagram illustrating a control method of an electrically variable device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood, however, that the embodiments described below are only for explanation of the embodiments of the present invention so that those skilled in the art can easily carry out the invention, It does not mean anything. In describing various embodiments of the present invention, the same reference numerals are used for components having the same technical characteristics.

The "control unit" referred to below may be embodied as an array of a plurality of logic gates, or a combination of a general-purpose microprocessor and a memory in which a program executable in the microprocessor is stored. It will be appreciated by those skilled in the art that the present invention may be implemented in other forms of hardware.

1 shows an equivalent circuit of an electrically variable device 100 according to an embodiment of the present invention.

Referring to FIG. 1, an electrically variable device 100 includes a first voltage sensing unit 101, a rectifying unit 102, a charging unit 103, a standby power supply unit 104, a blocking diode 105, an inverter 106, And may include a control unit 107, a second voltage sensing unit 108, a stop switch 109, a logic control unit 110, and a display unit 120.

More specifically, the rectifying unit 102 converts the three-phase AC power input from the external power supply side into a DC power and transmits the DC power to the inverter 106. At this time, the first voltage sensing unit 101 installed between the power supply lines connecting the external power supply side and the rectification unit 102 side can sense the voltage of the input AC power supply. The first voltage sensing unit 101 may be implemented as a transformer, and the sensed voltage is transmitted to the logic controller 110. That is, the first voltage sensing unit 101 may be implemented as a transformer so that the voltage of the input power source can be transformed to a rated voltage and transmitted to the rectifying unit 102 or the charging unit 103, even if the voltage of the input power source varies. When the first voltage sensing unit 101 is formed of a transformer, the transformer must be manufactured by H-type dry type. The transformer is supplied with commercial AC power and can supply a voltage suitable for the input of the net conversion unit and the charging unit 103.

The charging unit 103 is connected in parallel to the rectifying unit 102, converts the input three-phase AC power into DC power, and outputs the DC power to the standby power supply unit 104. At this time, the standby power source unit 104 may include a battery that is charged through the current passing through the charging unit 103. [ The spare power supply unit 104 may be a separate source for providing DC power to the inverter 106 separately from the voltage of the battery.

The rectifying unit 102 and the charging unit 103 convert the commercial or emergency AC power input through the input transformer into DC using a rectifier and a filter and supply the DC power to the inverter 106. The standby power supply unit 104 ) Should be configured so that it can be automatically charged with constant voltage and constant current to match the capacity of the battery.

The blocking diode 105 is provided between the rectification section 102 and the standby power source section 104 and prevents the current passing through the rectification section 102 from flowing to the standby power source section. For example, when a low input voltage is inputted through the rectifying unit 102 and then a steady voltage is inputted, the rectified voltage becomes higher than the voltage of the battery, so that the rectified current can be prevented from flowing back to the spare power supply unit 104.

The inverter 106 is connected in series to the rectifying unit 102 and can convert the direct current passed through the rectifying unit 102 and / or the direct current output from the redundant power source unit 104 into the output three-phase alternating current power.

The inverter control unit 107 senses the voltage of the output three-phase AC power source from the second voltage sensing unit 108 provided on the output side and inputs it to the inverter 106 so that the output of the output three- The pulse width can be controlled. In other words, the inverter 106 can re-convert the direct current to the alternating current power by the pulse width modulation (PWM) method. For example, when the input voltage is lowered, the pulse width is widened and the area is kept constant, so that the output voltage can be supplied as a stable sine wave. At this time, the inverter control unit 107 can control the inverter 106 such that the pulse width is increased or decreased by the PWM method when the input becomes low or high.

Here, the second voltage sensing unit 108 may be constituted by an output transformer, in which the primary winding of the transformer is connected to the inverter and the secondary winding is connected to the output side. The second voltage sensing unit 108 includes a leakage reactance component It should be manufactured in a special structure and shielded by a method including part of output filter to minimize the high frequency component and to maximize the efficiency of the equipment.

A static switch 109 is a switch that depends on the characteristics of a semiconductor, a magnetic body and the like, and does not have a movable contact. Thus, the current can be disconnected and applied without a delay, and it can be selected whether the three-phase AC power input is output through the inverter 106 or bypassed (bypassed). For example, when the abnormal operation of the inverter 106, the overload of the output AC voltage, the DC voltage output from the spare power supply unit 104 are low, or the overheat of the electric variable device is detected, The alternating current power can be outputted directly by bypassing the electric variable device.

When the voltage of the three-phase AC power source sensed by the first voltage sensing unit 101 exceeds a threshold value, the logic controller 110 interrupts the input of the three-phase AC power source, To the three-phase AC power for output and output. For example, the threshold value may be 10%, and even if the voltage rises by only 10%, an algorithm that cuts off the power source itself may be adopted so that stable AC power can be output even if the voltage fluctuates more than twice the normal voltage.

Meanwhile, the logic controller 110 may include an auxiliary power source for driving, an inverter control unit, a status display alarm unit, and a static switch control unit. The auxiliary power source may be directly supplied from the battery, Converters can be used to minimize malfunctions during switching or operation. In addition, the control circuit can be operated stably even when the transient voltage and the momentary power failure occur.

That is, in the case of conventional UPS, it is important to protect the circuit when the voltage is low or the power supply is cut off. In case that the overvoltage is higher than a certain level, it can not work properly, The electric variable device 100 according to an embodiment of the present invention can detect a voltage even when the voltage rises and transform the input voltage or operate the device with uninterrupted power to output a stable AC power.

In addition, the electrically variable device 100 may take an EMI filter on the input and output sides, respectively, so as to cause electromagnetic interference with other equipment (such as computers and electronic equipment) in the same room.

 The display unit 120 can display input / output voltage, current, charging state of the external power unit, etc., and it is possible to display all the necessary display, monitoring, control and communication functions with the SOFT-WARE Simple, and very precise, and can be installed at the top front of the unit to facilitate identification of operating conditions.

Specifically, the display unit 120 displays the following operation.

1) SYSTEM operation status

It graphically displays the current flow according to the operating state of the UPS, and displays INVERTER, BYPASS and battery operation status in the upper right of the screen.

① SYSTEM NORMAL state

② SYSTEM BYPASS status

③ SYSTEM BATTERY status

2) Measurement state

Input and output of electric variable device for voltage rise prevention can be displayed on one screen.

① Input voltage, current, frequency

② Output voltage, current, frequency

③ BYPASS Voltage, current, frequency

④ BATTERY Voltage, Current

⑤ BATTERY Charging and discharging elapsed time

⑥ Internal temperature

⑦ Active power and apparent power capacity

3) SYSTEM control UI

According to one embodiment, the following items can be controlled, and only an administrator can design and manufacture the system so that the system can be operated by inputting a password.

① Rectifier and inverter ON / OFF

② MANUAL TRANSFER

③ BATTERY MANAGEMENT (BMS function installation)

4) System operation history

SYSTEM consists of 2 submenus as shown below.

① System Measurement Status Details: Allows you to view the recorded power status in chronological order.

② SYSTEM alarm history: The recorded alarm history can be viewed in chronological order.

5) SYSTEM setting

The following details necessary for the operation of the electric variable device can be modified and changed.

① Change password

② Change phone / call number

③ Date and time change

④ Battery management change (BMS function installation)

⑤ Initial setting of measurement

⑥ Modem Configuration

⑦ SYSTEM specification setting

⑧ Registration of electric variable device for voltage rise prevention

CB1 to CB4, which are not described in the drawings, represent switches.

On the other hand, the method of outputting stable AC power by utilizing the voltage sensing device of the transformer type as shown in FIG. 1 has a disadvantage in that the breakdown voltage is high and the unit price is high. In addition, the reaction speed is also relatively slow, so that the voltage of the rectifying part abnormally rises depending on the cutoff speed. Therefore, in the electrically variable device according to another embodiment, a silicon controlled rectifier (SCR) switch 230 composed of a silicon controlled rectifier is installed instead of installing only the voltage sensing part 101 implemented as a transformer between the external power source side and the rectifying part The power can be cut off directly. At this time, if the capacity of the SCR switch and the transformer is maximized, the power can be cut off stably even if a high voltage is inputted.

As another example, the electrically variable device may be fabricated in such a manner that a switch semiconductor is installed on the commercial power supply and the inverter side, respectively, in order to prevent the inverter from being overloaded or overloaded, and to operate in synchronism with the automatic switch. In order to prevent the inrush current (CURSOR CURRENT) generated at this time, the stop switch should be composed only of a pure semiconductor element, not a mechanical contact (NFB MOTOR DRIVER or drive M / S switch, relay contact) and semiconductor device mixing method.

2 is a diagram showing an equivalent circuit of the electrically variable device 200 according to another embodiment of the present invention.

2, an SCR switch 230 is installed between the rectification unit 202 and the input power source TB1. Therefore, when the voltage sensing unit 201 senses an abnormal voltage (a voltage rise exceeding a threshold value), the SCR switch 230 is opened at the front end of the rectifying unit 202 through the control of the logic control unit 210 to cut off the power. Next, the power stored in the spare power supply unit 204 is passed through the inverter 206 and outputted. Also, when the input voltage returns to normal, the SCR switch 230 is switched again to charge the discharged spare power supply unit 204 so that the voltage of the discharged spare power supply unit 204 returns to normal.

Meanwhile, when the voltage sensed by the first voltage sensing unit 201 exceeds 10% of the normal input voltage, the logic controller 210 controls the SCR switch 230 to block the input of the 3-phase AC voltage as described above However, when the input voltage does not exceed 10% of the input voltage, the pulse width may be controlled through the inverter control unit 208 without interruption of the input voltage so that the output voltage may be controlled to be constant.

Since the description of the configuration other than the operation through the SCR switch 230 has been described above with reference to FIG. 1, it will be omitted here.

3 is a diagram showing a detailed circuit of an electrically variable device 300 according to an embodiment of the present invention.

Referring to FIG. 3, the SCR switch 330 may be provided for three-phase (R, S, T) power lines for receiving a three-phase AC voltage. Accordingly, the logic controller 310 can control the voltage regulator 300 so that the voltage of the rectifier does not rise abnormally according to the cutoff speed.

The heat sink module HEAT SINK MODULE performs the operation of the rectifying sections 102 and 202 and the inverters 106 and 206 as shown in FIGS. 1 and 2 to detect a three-phase So that AC power is output.

Other operations of the spare power supply unit 304, the inverter control unit 308, the logic control unit 310, and the display unit 320 have been described in detail with reference to FIGS. 1 and 2, and thus the description thereof will be omitted.

4 is a diagram illustrating a control method of an electrically variable device according to an embodiment of the present invention.

FIG. 4 shows only the steps necessary for explaining an embodiment of the present invention. 1 to 3 can be applied to the flow chart of FIG. 4, it will be readily apparent to those skilled in the art that the present invention is not limited thereto I can understand.

In step S400, the electrically variable device receives the three-phase AC power from the external power supply side.

In step S410, the electrically variable device can determine whether the voltage of the input three-phase AC power source rises above a threshold value. Here, the threshold value may be determined as 10%, and if it exceeds 10%, it may be determined whether or not the PWM limit is exceeded.

If the voltage of the input three-phase alternating-current power source is within the threshold value, the input alternating-current power source is converted into direct current in step S420, and the converted direct-current power source can be reconverted to the output three-phase alternating-current power source.

When the voltage of the input three-phase AC power source exceeds the threshold value, the input AC power source is cut off in step S430, and the DC power input from the spare power source unit can be converted into the three-phase AC power for output. At this time, the electric variable device can immediately cut off the current by using a silicon controlled rectifier (SCR) switch composed of a silicon control rectifier installed in each of three-phase (R, S, T) power lines receiving three-phase AC power.

In step S440, the electrically variable device may include outputting the converted output three-phase AC power.

Meanwhile, according to the above-described configurations, the electrically variable device 100 can selectively perform the following five operation functions.

1. Normal operation

The rectifying part supplied with the commercial power or the backup power supplies the alternating current to the direct current and supplies it to the reverse converting part. The inverse converting part converts the alternating current into the synchronous current synchronized with the commercial power so as to supply the stable AC power to the load. At the same time, the charging part automatically charges the battery.

2. Operation during voltage rise or power failure

When the commercial power supply is interrupted, the battery which was charged by the charging unit during the normal operation is supplied to the inverse conversion unit in the inverse stage (the power can be moved without momentary power failure). The inverse conversion unit converts the direct current into AC, During the time, the inverter's own oscillation supplies a stable AC output to the load.

3. Operation at normal return

When the AC power is restored and AC is supplied again to the rectification part, the discharge of the battery is automatically stopped, and the commercial power is supplied through the rectifying part through the inversion part to the load in steady high quality in synchronized with the commercial power. Recharge the discharged battery.

4. Bypass operation

Inverse transformer synchronizes the output frequency and voltage with the commercial power supply. It is synchronized with the commercial power supply during the automatic shutdown of the inverter due to malfunction and overload of the equipment. When the overload condition is released, it is automatically re-transferred to the inverter power supply.

5. Emergency operation in case of failure

Continuously supplies power to the load during the failure of the inverter and synchronous switch and repair.

As described above, according to an embodiment of the present invention, it is possible to control not only the case where the input AC power is cut off or the voltage is lowered, but also the three-phase AC power is outputted stably even when the voltage rises.

Particularly, by controlling the voltage rise by arranging the SCR switch composed of the silicon control element and the high breakdown voltage at the front end of the rectification part, even if the voltage exceeding twice the design voltage is input, Can be controlled.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

Claims (10)

A first voltage sensing unit connected to an external power source through a power line and sensing a voltage of a three-phase AC power source input from the external power source;
A rectifier connected between the first voltage sensing unit and the first node and converting the three-phase AC power into a direct current;
A charging unit connected between the first voltage sensing unit and a second node for converting the three-phase alternating current power to direct current and outputting the direct current power to a spare power unit connected to a second node;
A blocking diode for blocking the current output from the rectifying section from flowing to the second node via the first node, a blocking diode connected to the first node, a cathode electrode connected to the second node, and an anode electrode connected to the second node;
An inverter connected in series to the first node for converting a direct current output from the rectifying unit or a direct current output from the preliminary power supply unit via the blocking diode to a three-phase AC power for output;
And an inverter control unit for controlling a pulse width to be input to the inverter so as to detect the voltage of the output three-phase AC power source in the second voltage sensing unit connected to the output side of the inverter and to keep the output of the three- ; And
Wherein when the voltage of the three-phase AC power source sensed by the first voltage sensing unit is within a threshold value, the direct current output from the rectifying unit is supplied to the inverter and the direct current output from the charging unit is supplied to the spare power unit,
When the voltage of the three-phase AC power source sensed by the first voltage sensing unit rises above a threshold value, the DC power outputted from the spare power source unit after the input of the three-phase AC power source is cut off, And a logic control unit for controlling the supply of the voltage to the power supply unit. The method according to claim 1,
Wherein the voltage rising prevention electric variable device includes a silicon controlled rectifier (SCR) switch formed of a silicon controlled rectifying element between the external power supply side and the rectifying part, and the logic control part detects the three-phase AC voltage sensed by the first voltage sensing part And when the electric current is higher than a predetermined value, opens the switch to cut off the input of the three-phase AC voltage. The method of claim 2,
Wherein the SCR switch is provided for three-phase (R, S, T) power lines receiving three-phase AC power. The method of claim 2,
Wherein the logic controller controls the SCR switch to cut off the input of the three-phase AC voltage when the voltage sensed by the first voltage sensing unit exceeds 10% of the normal input voltage, And controls the pulse width to be constant through the inverter control unit so that the output voltage is constant. The method according to claim 1,
Wherein the logic controller controls the input three-phase AC power to bypass the electric variable device and output the electric variable device immediately when the abnormal operation of the inverter, the overload of the output AC voltage, or the overheat of the electric variable device is detected Wherein the electric variable device comprises: The method according to claim 1,
Wherein the first voltage sensing unit includes an input transformer and the input transformer is configured to be of an H type dry type to supply a constant voltage to the charging unit. The method according to claim 1,
Wherein the second voltage sensing section comprises an output transformer, the output transformer containing a leakage reactance component to minimize high frequency components. The method according to claim 1,
Wherein the electrically variable device comprises a stop switch comprised of a pure semiconductor device for preventing the inverter from operating in an unsteady state or preventing an inrush rectification occurring upon overloading. delete delete
KR1020170143543A 2017-10-31 2017-10-31 Variable voltage stable power supply and method for controlling thereof KR101854089B1 (en)

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Publication number Priority date Publication date Assignee Title
KR20210021571A (en) * 2019-05-30 2021-02-26 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 Uninterruptible power supply

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JPH01122327A (en) * 1987-10-30 1989-05-15 Sansha Electric Mfg Co Ltd Power supply device
JPH03243142A (en) * 1990-02-20 1991-10-30 Toshiba Corp Uninterruptible power supply
JP2014143789A (en) * 2013-01-22 2014-08-07 Toshiba Mitsubishi-Electric Industrial System Corp Uninterruptible power supply device
JP2014222955A (en) * 2013-05-13 2014-11-27 アイシン精機株式会社 Supply circuit

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JPH01122327A (en) * 1987-10-30 1989-05-15 Sansha Electric Mfg Co Ltd Power supply device
JPH03243142A (en) * 1990-02-20 1991-10-30 Toshiba Corp Uninterruptible power supply
JP2014143789A (en) * 2013-01-22 2014-08-07 Toshiba Mitsubishi-Electric Industrial System Corp Uninterruptible power supply device
JP2014222955A (en) * 2013-05-13 2014-11-27 アイシン精機株式会社 Supply circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210021571A (en) * 2019-05-30 2021-02-26 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 Uninterruptible power supply
KR102551412B1 (en) 2019-05-30 2023-07-04 도시바 미쓰비시덴키 산교시스템 가부시키가이샤 uninterruptible power supply

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