KR101309009B1 - Apparatus and method for compensating instant power failure - Google Patents

Abstract

PURPOSE: An apparatus and method for compensating an instantaneous power failure are provided to prevent defects by giving an alarm when an overvoltage is charged. CONSTITUTION: A charging unit includes a plurality of supercapacitors. A power converting unit (110) converts charging power to AC power. A plurality of unit monitors monitor each charging voltage of the supercapacitors. An alarm part (118) gives an alarm when the supercapacitors are charged with overvoltages. A control unit (116) controls the alarm part to give the alarm about the defects of the supercapacitors. [Reference numerals] (100) Input CB; (100a) Converter; (102) Voltage sag detection unit; (104) Non-contact point switching unit; (106) Output CB; (108) Charging unit; (110) Power converting unit; (110b) Inverter; (112) Monitoring unit; (114) Charging voltage detection unit; (116) Control unit; (118) Alarm part; (120) Bypass; (AA) AC power; (BB) Load

Description

Instantaneous power failure compensation device and method {APPARATUS AND METHOD FOR COMPENSATING INSTANT POWER FAILURE}

The present invention relates to an instantaneous power failure compensation apparatus and method for supplying stable AC power to a load by using the charging power of a charging unit when a momentary power failure occurs within a set time.

Commercial AC power supplied to the load of machine tools in the industrial field is very reliable, but power instability such as instantaneous power failure often occurs. This momentary power failure may cause a failure of the products produced by the load or to shut down the production line, causing huge losses for the producers of the products.

The instantaneous power failure is caused by a short circuit in the power system, a lightning strike, and a switching operation of a large load, and the duration of this abnormal power quality state in the power system is generally 1 sec or less, and the power failure is continued for a longer time. If this persists, it shall be regarded as permanent blackout and the operation of the load shall be stopped.

Most industrial equipment is designed to withstand momentary power outages due to mechanical properties and electrical inertia, but components such as relays, starters, and microcontrollers are extremely short in a few cycles. The operation is often stopped due to a momentary power failure.

Therefore, in preparation for such a power failure, an instantaneous power failure compensation device capable of continuously supplying AC power even when power is momentarily disconnected has been developed and widely used.

The momentary power outage compensator normally stores power in the charging unit, and in the event of a failure such as a short time interruption or voltage drop, the AC power is continuously supplied to the load by the charging power of the charging unit to be driven normally. To help.

In the momentary power compensation device, the charging unit typically charges power by connecting a plurality of supercapacitors in series (see Korean Patent Publication No. 10-2010-0104006).

If any one of the plurality of super capacitors connected in series is defective and the normal voltage is not charged, the remaining voltage of the other super capacitors rises above the allowable voltage. Will cause a normal super capacitor failure.

However, in the related art, only the total voltage charged in the charging unit is detected to monitor only the charging voltage, and the charging voltage of each of the plurality of super capacitors has not been detected.

In addition, when checking the momentary power outage compensation device, it may be disconnected from the system. When the momentary power outage compensator is separated from the system, AC power cannot be supplied to the load, thereby preventing the load from operating.

Republic of Korea Patent Publication No. 10-2010-0104006 (published Sep. 29, 2010)

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus and a method for compensating for an instantaneous power failure, which monitor whether a plurality of super capacitors connected in series are charged with an overvoltage and generate an alarm when an overvoltage is detected.

In addition, the present invention is provided with a bypass CB (Circuit Breaker) for supplying the AC power directly to the load provides an instantaneous power failure compensation device and method that can be checked without interrupting the AC power supplied to the load.

The instantaneous power failure compensating device of the present invention includes a charging unit including a plurality of super capacitors in which DC power is charged and discharged, and when the external AC power is input, converts the external AC power into DC power to charge the charging unit. And a voltage converter configured to convert charging power of the charging unit into AC power and output the load to a load when a voltage drop occurs in the external AC power, and a monitoring unit for monitoring charging voltage of each of the plurality of supercapacitors. And an alarm unit for alarming overvoltage charging of the plurality of supercapacitors, and controlling the power conversion unit according to whether the external AC power is input, and the monitoring unit detects that the overvoltage is charged in any one of the plurality of supercapacitors. Control the alarm to occur when It may comprise a control unit.

A plurality of super capacitors are connected in series, and the charging unit may further include a plurality of resistors connected in parallel to each of the plurality of super capacitors.

The plurality of resistors may have the same resistance value.

The monitoring unit may include a plurality of unit monitoring units that respectively monitor charging voltages of the plurality of super capacitors, and each of the plurality of unit monitoring units may be turned on when the charging voltage of the super capacitor is greater than or equal to a set voltage. And a photo coupler operating when the constant voltage diode is turned on to generate an overvoltage detection signal.

The instantaneous power failure compensating apparatus of the present invention further includes a charging voltage detector for detecting a charging voltage of the charging unit, and the controller controls the power conversion unit according to a detection signal of the charging voltage detection unit to charge the charging unit with an overvoltage. Can be controlled.

In addition, the instantaneous power failure compensation device of the present invention further includes a voltage drop detection unit for detecting a voltage drop of the external AC power, and a switching unit for switching the external AC power to supply or cut off to the load, The control unit turns on the switching unit when the voltage drop detection unit does not detect the voltage drop so that the external AC power is supplied to the load, and turns off the switching unit when the voltage drop detection unit detects the voltage drop. It can be controlled to cut off the external AC power.

In addition, the instantaneous power failure compensating apparatus of the present invention may further include a bypass circuit breaker (CB) for bypassing the external AC power to supply the load.

And the instantaneous power failure compensation method of the present invention, when the external AC power is input, the power converter converts the external AC power to the DC power under the control of the controller to charge the plurality of supercapacitors of the charging unit; When a voltage drop occurs in the external AC power, the power converter converts the charging power of the charging unit into AC power and outputs the load to the load according to the control of the controller; And determining whether overvoltage is charged in each of the plurality of supercapacitors, and generating an alarm by controlling the alarm unit when the overvoltage charging is determined.

When the external AC power is input, the power converter converts the external AC power into DC power and charges the plurality of supercapacitors in the charging unit according to the control of the controller. And determining whether charging of the charger is completed by inputting the control unit, and controlling the controller not to overcharge the charging unit by stopping the power conversion unit when it is determined that charging of the charger is completed. .

In addition, the instantaneous power failure compensation method of the present invention, if the voltage drop does not occur in the external AC power, the control unit turns on the switching unit so that the external AC power is supplied to the load, and the external AC When a voltage drop occurs in the power, the control unit may further include turning off the switching unit to cut off the external AC power.

According to the instantaneous power failure compensating apparatus and method of the present invention, by monitoring the charging voltage of the plurality of capacitors provided in the charging unit to determine whether the over-voltage is charged, an alarm is generated when the over-voltage is charged so that the operator can check do.

Therefore, any one of the plurality of super capacitors can be checked and replaced immediately when a failure occurs, thereby preventing the failure of the super capacitors normally operating by the defective super capacitor. .

In addition, the present invention is provided with a bypass CB can directly supply AC power to the load, so that the instantaneous power outage compensator can be separated from the system and checked while continuing to supply AC power to the load.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings, which do not limit the present invention, and like reference numerals designate like elements in some drawings.
1 is a block diagram showing the configuration of an embodiment of an instantaneous power failure compensation device of the present invention;
Figure 2 is a detailed view of the charging unit and the monitoring unit in the momentary power compensation device of the present invention,
Figure 3 is a detailed circuit diagram showing an embodiment of the unit monitoring unit in the momentary power compensation device of the present invention, and
Figure 4 is a signal flow diagram showing the operation of the control unit according to the instantaneous power failure compensation method of the present invention.

Hereinafter, the instantaneous power failure compensating apparatus and method according to the present invention will be described in detail with reference to the accompanying drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

1 is a block diagram showing the configuration of an embodiment of an instantaneous power failure compensation device of the present invention. Here, reference numeral 100 denotes an input CB (circuit breaker) for inputting commercial AC power, and reference numeral 106 denotes an output CB for supplying commercial AC power to a load. Between the input CB 100 and the output CB 106, a voltage drop detector 102 for detecting the voltage drop of the commercial AC power and a switching unit 104 for switching the commercial AC power in a contactless state. Can be.

Reference numeral 108 is a live part. The charging unit 108 has a plurality of super capacitors connected in series to charge DC power.

Reference numeral 110 is a power converter. The power converter 110 may include a converter 110a that converts AC power into DC power, and an inverter 110b that converts DC power into AC power. The converter 110a converts the AC power output from the switching unit 104 into DC power to charge the charging unit 108. The inverter 110b converts the DC power charged in the charging unit 108 into AC power and outputs the load through the output CB 106.

Reference numeral 112 is a monitoring unit. The monitoring unit 112 monitors whether each of the plurality of supercapacitors provided in the charging unit 108 is charged with an overvoltage higher than a preset voltage.

Reference numeral 114 denotes a charging voltage detector. The charging voltage detector 114 detects the total voltage charged in the charging unit 108.

Reference numeral 116 is a control unit. The controller 116 determines whether a voltage drop has occurred in the AC power as an output signal of the voltage drop detector 102, and controls the switching unit 104 to load when the voltage drop does not occur. Allow AC power to be supplied. In addition, the controller 116 controls the converter 110a of the power converter 110 to convert AC power into DC power to charge the charging unit 108 when the AC power is normally input. When the charging voltage detector 114 detects the completion of the charging of the charging unit 108, the converter 110a is stopped to control the charging unit 108 from being overcharged.

In addition, the control unit 116 switches the switching unit 104 to cut off the AC power when the voltage drop detection unit 102 detects the voltage drop of the AC power, the inverter of the power converter 110 The control unit 110b converts the charging power of the charging unit 108 into AC power and then supplies the load to the load through the output CB 106.

In addition, the control unit 116 inputs a monitoring signal of the monitoring unit 112 to determine whether each of the plurality of supercapacitors provided in the charging unit 108 is charged with an overvoltage higher than a preset voltage, and overvoltage If the charging is determined to control the generation of an alarm.

118 is an alarm unit. The alarm unit 118 generates an alarm under the control of the controller 116.

Reference numeral 120 is a bypass CB. The bypass CB 120 bypasses AC power input from the outside and outputs the load to the load.

In the instantaneous power failure compensation device of the present invention configured as described above, external AC power is input to the voltage drop detection unit 102 through the input CB 100.

The voltage drop detection unit 102 detects whether or not a voltage drop has occurred in the external AC power, and generates a detection signal.

Then, the controller 116 inputs the detection signal of the voltage drop detection unit 102 to determine whether a voltage drop has occurred in the external AC power, and when the voltage drop has not occurred, the AC power is returned to normal. As input, the switching unit 104 controls the AC power to pass.

For example, the switching unit 104 is composed of a semiconductor switching element that performs a switching operation in a contactless state, the control unit 116 to turn on the semiconductor switching element to pass the AC power.

Then, AC power input through the input CB 100 is sequentially supplied to the load through the voltage drop detector 102, the switching unit 104, and the output CB 106.

In this state, the controller 116 inputs the charging voltage detected by the charging voltage detector 114 to determine whether the DC power is fully charged in the charging unit 108.

When the DC unit is not fully charged in the charging unit 108, the controller 116 controls the converter 110a of the power converter 110 to convert AC power into DC power, and converts the converted DC power. Output to the charging unit 108 to charge.

As described above, in the state in which the charging unit 108 is charged with DC power, the controller 116 repeatedly inputs the charging voltage detected by the charging voltage detector 114 to determine whether the DC power is fully charged in the charging unit 108. When the battery is fully charged, the converter 110a is stopped to control the overvoltage to be charged to the charging unit 108.

The monitoring unit 112 monitors the voltage of each of the plurality of supercapacitors provided in the charging unit 108 to determine whether the overvoltage is charged, and detects the charging of the overvoltage when the overvoltage is detected. Output to the control unit 116.

The control unit 116 inputs a monitoring signal of the monitoring unit 112 to determine whether there is a super capacitor charged with an overvoltage, and the alarm unit 118 generates an alarm when there is a super capacitor charged with an overvoltage. Control so that the operator can check quickly.

On the other hand, when checking the instantaneous power failure compensation device of the present invention, the AC power should be separated from the system supplied to the load.

To this end, the present invention includes a bypass CB 120. That is, when checking the momentary power failure compensation device of the present invention, the operator first turns on the bypass CB 120 so that external AC power is supplied to the load through the bypass CB 120.

In such a state, the AC power is not input to the input CB 100 and the output CB 106 is separated from the load so that the momentary power compensation device of the present invention can be safely checked.

The controller 116 inputs the detection signal of the voltage drop detector 102 to turn off the switching unit 104 when the voltage drop of the external AC power is determined.

The controller 116 operates the inverter 110b to perform a power compensation operation. That is, the inverter 110b converts the charging power of the charging unit 108 into AC power under the control of the controller 116, and outputs the converted AC power to the load through the output CB 106.

Figure 2 is a detailed view of the charging unit and the monitoring unit in the momentary power compensation device of the present invention. Referring to FIG. 2, in the charging unit 108 of the present invention, a plurality of super capacitors C1 (C1-1, C1-2, ..., C1-N) are connected in series, and a plurality of super capacitors C1-1 and C1 are connected. A plurality of resistors R1 (R1; R1-1, R1-2, ..., R1-N) each having the same resistance value are connected in parallel to each of -2, ..., C1-N.

The monitoring unit 112 of the present invention may include a plurality of unit monitoring units 112-1, 112-2,..., 112 -N.

Figure 3 is a detailed circuit diagram showing an embodiment of a unit monitoring unit in the momentary power compensation device of the present invention. Referring to FIG. 3, each of the plurality of unit monitoring units 112-1, 112-2,..., 112 -N includes a constant voltage diode ZD and a resistor between both terminals of each of the plurality of supercapacitors C1. (R2) and the light emitting part LD of the photocoupler are connected in series, the power supply terminal Vcc is connected through the resistor R3 to the collector of the light receiving transistor TR of the photocoupler, and the collector of the light receiving transistor TR is connected. And an overvoltage detection signal at the connection point of the resistor R3.

According to the present invention configured as described above, each of the plurality of resistors R1 (R1; R1-1, R1-2, ..., R1-N) is provided in each of the plurality of supercapacitors C1-1, C1-2, ..., C1-N. This is connected in parallel.

Each of the plurality of resistors R1; R1-1, R1-2, ..., R1-N has the same resistance value, and each of the plurality of super capacitors C1; C1-1; C1-1, C1-2, ..., C1-N Each of them may be charged with the same voltage.

In addition, the charging voltages of the plurality of supercapacitors C1 (C1-1, C1-2, ..., C1-N) are constant voltage diodes ZD of the unit monitoring units 115-1, 116-2, ..., 116-N. And the resistor R2 are applied to the light emitting element LD of the photocoupler.

Here, the resistor R2 serves to limit the overcurrent to the light emitting device LD.

Therefore, when the charging voltage of the supercapacitor C1 is equal to or higher than the set voltage, the light emitting element LD of the photocoupler is turned on, and the light receiving transistor TR is turned on to output a low potential overvoltage detection signal.

For example, assuming that the operating voltage of the constant voltage diode is 1.5V and the light emitting voltage of the light emitting device LD is 0.7V, when the voltage of less than 2.2V is charged in the super capacitor C1, the light emitting device ( LD) does not light up, so the overvoltage detection signal is not output.

However, when the supercapacitor C1 is charged with a voltage exceeding 2.2 V, the constant voltage diode ZD is turned on and the light emitting device LD is turned on, so that the light receiving transistor TR is turned on to have a low potential. The overvoltage detection signal is output.

The overvoltage detection signal is input to the controller 116. Then, the controller 116 controls the alarm unit 118 to generate an alarm indicating that there is an abnormality in the super capacitors C1-1, C1-2, ..., C1-N of the charging unit 108.

Figure 4 is a signal flow diagram showing the operation of the control unit according to the instantaneous power failure compensation method of the present invention. Referring to FIG. 4, the controller 116 inputs a voltage drop detection signal detected by the voltage drop detection unit 102 (S400), and determines whether or not an AC power voltage drop has occurred using the input voltage drop detection signal. (S402).

As a result of the determination, when the voltage drop of the AC power does not occur, the control unit 116 turns on the switching unit 104 to supply AC power to the load (S404).

The controller 116 inputs a charge voltage detection signal detected by the charge voltage detector 114 (S406), and determines whether the charging of the charge unit 108 is completed using the input charge voltage detection signal (S406). s408).

When the charging of the charging unit 108 is completed, the control unit 116 stops the converter 110a so that the overvoltage is not charged to the charging unit 108 (S410), and the charging of the power of the charging unit 108 is performed. If it is not completed, the control unit 116 operates the converter 110a to charge the DC power to the charging unit 108 (S412).

In this state, the control unit 116 inputs an overvoltage detection signal from the monitoring unit 112 (S414), and the plurality of supercapacitors C1 (C1; C1-1, C1-2, ..., C1) as the input overvoltage detection signal. It is determined whether any one of -N) is overcharged (S416).

As a result of the determination, when any one of the plurality of supercapacitors C1 (C1-1, C1-2, ..., C1-N) is overcharged, the controller 116 controls the alarm unit 118 to alert the user. Occurs (S418).

On the other hand, when the voltage drop of the AC power is detected in step S402, the control unit 116 turns off the switching unit 104 (S420).

The controller 116 operates the inverter 110b to perform a power compensation operation (S422). That is, the inverter 110b converts the charging power of the charging unit 108 into AC power under the control of the controller 116, and outputs the converted AC power to the load through the output CB 106.

In this state, the controller 116 inputs the output signal of the voltage drop detector 102 to determine whether the power failure is restored (S424).

When the power failure is restored as a result of the determination, the control unit 116 returns to step S400 to supply AC power input from the outside to the load as described above, and charge the power to the charging unit 108. To perform.

When the power failure is not restored as a result of the determination in step S424, the controller 116 determines whether the discharge of the charging unit 108 is completed by the output signal of the charging voltage detection unit 114 (S426). Then, the process returns to step S422 until the discharge of the charging unit 108 is completed to repeat the power compensation operation.

The instantaneous power failure compensating apparatus and method described above may not be limitedly applied to the configuration and method of the above-described embodiments, but the embodiments may be selectively modified in whole or in part in order to allow various modifications to be made. It may be configured in combination.

100: input CB 102: voltage drop detection unit
104: switching unit 106: output CB
108: charging unit 110: power conversion unit
110a: converter 110b: inverter
112: monitoring unit 112-1, 112-2,... , 112-N: unit monitoring unit
114: charge voltage detection unit 116: control unit
118: alarm unit 120: bypass CB
C1: Supercapacitors R1 to R3: Resistance
ZD: constant voltage diode LD: light emitting element
TR: Light Transistor

Claims (10)

A charging unit including a plurality of super capacitors in which DC power is charged and discharged;
When external AC power is input, the external AC power is converted into DC power to charge the charging unit, and when a voltage drop occurs in the external AC power, the charging power of the charging unit is converted into AC power to load A power converter for outputting the power;
A plurality of unit monitoring units for monitoring the charging voltages of the plurality of supercapacitors, respectively;
An alarm unit for alarming overvoltage charging of the plurality of supercapacitors; And
The alarm unit alarms that the plurality of supercapacitors contain a failure when the power conversion unit is controlled according to the external AC power input and any one of the plurality of unit monitoring units detects an overvoltage charge. The momentary power compensation device comprising a control unit.
The method of claim 1,
A plurality of super capacitors are connected in series,
The charging unit includes:
And a plurality of resistors connected in parallel to each of the plurality of supercapacitors.
3. The method of claim 2,
Wherein the plurality of resistors comprises:
A momentary power compensation device having the same resistance value.
The method of claim 1,
Each of the plurality of unit monitoring units,
A constant voltage diode turned on when the charging voltage of the super capacitor is greater than or equal to a set voltage; And
And a photo coupler operating when the constant voltage diode is turned on to generate an overvoltage detection signal.
The method of claim 1,
And a charging voltage detector for detecting a charging voltage of the charging unit.
The control unit,
And controlling the power conversion unit according to a detection signal of the charging voltage detection unit so as to prevent the overvoltage from being charged in the charging unit.
The method of claim 1,
A voltage drop detector for detecting a voltage drop of the external AC power; And
It further comprises a switching unit for switching the external AC power to supply or cut off to the load,
The control unit,
When the voltage drop detection unit does not detect the voltage drop, the switching unit is turned on so that the external AC power is supplied to the load, and when the voltage drop detection unit detects the voltage drop, the switching unit is turned off to the external unit. The momentary power compensation device to control to cut off the AC power.
The method of claim 1,
And a bypass CB (circuit breaker) for bypassing the external AC power and supplying the load to the load.
When the external AC power is input, the power converter converts the external AC power into DC power and charges the plurality of supercapacitors in the charging unit under the control of the controller;
When the voltage drop occurs in the external AC power, converting the charging power of the charging unit into AC power by outputting the load to the load under the control of the controller;
Determining, by the controller, whether an overvoltage is charged in each of the plurality of supercapacitors by inputting detection signals of a plurality of unit monitoring units; And
If any one of the plurality of super capacitors is determined to be over-voltage charging, the control unit for controlling the alarm, generating an alarm for notifying that the plurality of super capacitors contain a failure; instantaneous power failure compensation comprising a Method of compensating for power failure in the device.
The method of claim 8,
When the external AC power is input, the power converter converts the external AC power into DC power and charges the plurality of supercapacitors in the charging unit according to the control of the controller.
Determining, by the controller, whether the charging of the charging unit is completed by inputting a detection signal of the charging voltage detection unit; And
And stopping the power converter to control overcharging of the overvoltage to the charger when the charging of the charger is determined to be complete.
The method of claim 8,
When the voltage drop does not occur in the external AC power, the controller turning on a switching unit to supply the external AC power to the load; And
And turning off the switching unit to cut off the external AC power when a voltage drop occurs in the external AC power.

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