KR100665540B1 - All igbt ups system for input/output three phases - Google Patents

Abstract

An all-IGBT(Insulated Gate Bipolar Transistor) UPS(Uninterruptible Power Supply System) system for inputting/outputting 3-phase is provided to offer a high-performance UPS by setting/storing diverse variables with a keypad, as all functions including PWM(Pulse Width Modulation) generation of a rectifier and an inverter, and generation of bypass power semiconductor switching pulse signal are made of software by using a main controller as a microprocessor. The first transformer(12) converts input power inputted through a 3-phase input switch into 2-phase. A distribution switch switches the input power. An input filter(13) filters volatile/current of the input power to a load side through a primary coil. A PWM rectifier(14) stabilizes the filtered voltage/current. A battery(15) supplies uninterruptible power. The inverter(16) converts battery power into AC power and stably supplies the AC power to the load side when power is failed. An output filter(17) filters the output power for the load side to the inverter during normal power and filters the output of the inverter to the power of the load side during power failure by connecting between the inverter and output load of the rectifier. The second transformer(18) transforms the output power of the output filter into the 3-phase.

Description

All IGBT UPS system for input / output three phases}

1 is a block diagram of a UPS / AVR combined power supply according to the prior art.

Figure 2 is a configuration of a UPS system showing an embodiment according to the present invention.

3 is an internal functional block diagram of the microprocessor of FIG.

4 is a configuration diagram of another embodiment of the UPS system according to the present invention;

5 is a simplified circuit diagram of a UPS system according to the present invention.

6A to 6E are explanatory diagrams showing power flow paths for respective operation modes of the UPS system according to the present invention;

Figure 7 is an exemplary control panel of the keypad and LCD of the UPS system according to the present invention.

<Description of the code | symbol about the principal part of drawing>

11: SCR 12: First Transformer

13: input filter 14: PWM rectifier

15: battery 16: inverter

17: output filter 18: the second transformer

21: 3-phase input switch 22: distribution switch

23: three-phase output switch 70: gate driver

80: first high speed detection unit 81: second high speed detection unit

90: microprocessor 91: PWM generator

92: output voltage control unit 93: main control unit

94: battery charge control unit 95: three-phase voltage monitoring unit

96: mode setting unit 100: keypad

110: LCD 120: input / output controller

The present invention relates to an uninterruptible power supply (UPS) system, which is a high-efficiency, high-performance online UPS that controls the inverter output voltage at a constant voltage while the output power is supplied from the line. Parallel all-in-one 3-phase input / output online All to perform the function of automatic voltage regulator (hereinafter referred to as 'AVR') to control the buffer voltage and to set all the function variables with the keypad. Insulated Gate Bipolar Transistor (IGBT) UPS system.

In general, in the case of medium and large information processing devices, when the power supply is interrupted such as a power failure, the data of the uninterruptible power supply (hereinafter referred to as a UPS) is supplied so that working data is lost during an emergency such as a power failure. I am preparing for a problem.

That is, in general, computers store working data in RAM, so if power is interrupted during work, many data in the work disappears and there is no way to restore the data. There is this. Therefore, in computer systems that perform important tasks such as large computers, an uninterruptible power supply (UPS) is installed so that the computer can be supplied with power even when the power supply from the power company is interrupted.

On the other hand, even in a personal computer (PC), the need for a UPS to cope with unforeseen accidents due to a power outage during work is the same, but the conventional UPS is expensive and bulky and requires a separate installation space is not easily used However, in recent years, due to the rapid spread of personal computers, the necessity and utilization of the above-mentioned UPS are increasing in offices and homes.

In addition, the AVR (Automatic Voltage Regulator) is a device that constantly outputs irregular voltage caused by the change of the input voltage. It is mainly used with the UPS, and thus the power failure compensation function and the voltage regulation function are used simultaneously. Various products having the functions of the UPS and the AVR are being developed.

1 is a block diagram of a UPS / AVR combined power supply according to the prior art.

As shown in FIG. 1, the conventional UPS / AVR composite power supply device includes an A / D converter 4 for converting commercial AC power into DC to charge a battery Batt and supply DC power to an inverter. The D / A inverter 6 converts the DC power into AC power and supplies the load to the load, and the commercial AC power or D / A inverter 6 in case of abnormality or overload of the D / A inverter 6. ) Is composed of a synchronous transfer switch unit (7) for selectively applying an AC power source of the AC power supply to an external system, and a CPU (1) for monitoring the input power and controlling the operation of the synchronous transfer switch unit (7). . In the drawing, reference numeral 2 denotes a front panel for displaying a charging state and a power supply state of a battery Batt, and 3 and 8 are noise filters.

Hereinafter, the operation of the conventional UPS / AVR combined power supply device will be described.

First, the commercial AC power input via the input terminal is converted from the A / D converter 4 to the DC power in normal operation, which charges a plurality of batteries BATT included in the charger 5. In addition, the DC power of the A / D converter 4 is converted into the AC power from the D / A inverter 7 and applied to the external system through the synchronous transfer switch unit 7 and the plurality of output terminals. At this time, the A / D converter 4 adjusts the low voltage and the overvoltage step by step so as to uniformly output the irregular voltage generated by the variation of the input voltage.

In the above state, when commercial AC power is out of power, the DC power of the battery BAT charged with the predetermined voltage is converted from the D / A inverter 6 to the AC power, and externally via the synchronous transfer switch 7. By being applied to the system, the external system can operate stably despite the power failure.

If the commercial AC power is applied again during this operation, the charger 5 again charges the battery BATT.

In addition, when an abnormality occurs in the D / A inverter 6, the CPU 1 detects the error and bypasses the commercial AC power directly to an external system by switching operation of the synchronous transfer switch 7. In this case, the user may recognize that an abnormality occurs by looking at the battery state on the front panel 2.

According to the prior art, for example, a single computer system includes a computer main body, a monitor, a printer, a digitizer, a hub, a plotter, an external modem, and the like, which requires and does not require power compensation during a power failure. On the other hand, because there are weak equipment in the irregular power supply, by using the UPS and the AVR function, there is an advantage that you do not have to pay expensive costs because you do not purchase the UPS and AVR separately.

However, in the conventional uninterruptible power supply, the uninterruptible power supply has caused a lot of deterioration in the reliability of the power supply line, such as deterioration of efficiency of the commercial line, generation of harmonic noise, and power factor distortion. In particular, due to the recent increase in capacitive loads, there are disturbances in power plants due to harmonic currents, and the problem of peak power is so severe that there is a need for countermeasures caused by the uninterruptible power supply itself.

In addition, from the load side, the output distortion of the uninterruptible power supply device in a non-linear load adversely affects the neighboring devices, thereby hindering the supply of high-quality used power, which necessitates the need for fundamental improvement.

Therefore, the present invention devised to solve the above problems is to use the main controller as a microprocessor, all functions, including the generation of pulse width modulation (PWM) of the rectifier and inverter, the generation of bypass power semiconductor switching pulse signal, etc. It is designed to provide a high functionalized UI by storing various parameters related to the system by using a keypad to be memorized.

In another aspect, the present invention is to provide a UPS that the LCD control for keypad input signal processing and monitoring is processed in communication with the main controller using an 8-BIT PIC micro-controller to be strong and separated operation in the electrical external environment. .

In addition, the present invention is to provide an on-line UPS that is output so that the output voltage is not disconnected in conjunction with the line voltage and the transfer time is ignored through the rapid detection technology of the three-phase input / output voltage.

In addition, the present invention supplies energy to the load with high efficiency through the line under normal three-phase input / output voltage, and the inverter generates a voltage almost the same as the three-phase input / output voltage to charge the abnormal voltage while charging It is to provide.

UPS according to the present invention for achieving the above object, the first transformer for converting the input power input through the three-phase input switch to a single phase; A distribution switch for switching the input power input through the first transformer; An input filter for filtering voltage / current through the primary coil from the power input through the distribution switch; A PWM rectifier for stabilizing the filtered voltage / current for the input filter; A battery for supplying uninterruptible power; An inverter for converting the battery power into an AC power and outputting it to a load side during a power failure, or receiving the input power from the load side in normal operation, converting the battery power into a DC power, and charging the battery; An output filter connected between the inverter and the output load side of the PWM rectifier to filter the load side output power to the inverter side during normal power supply and the output of the inverter to the load side power source in case of power failure; A second transformer connected to the output filter to convert output power into three phases; A three-phase output switch for stabilizing power through the second transformer and outputting the output of the output filter and the SCR; An input voltage Vi and an input current Is at the rear end of the input switch, an output voltage Vo and an output current Ip at the load side connection terminal, and a DC voltage Vd at the battery, respectively, are detected. First and second high speed detectors for detecting signals detected by using a potential transformer (PT) and a current transformer (CT) at high speed without delay by a resistance circuit; Input / output voltage and current and DC voltage detected by the first and second high speed detectors are inputted, and various functions are set by key input to control uninterrupted control, automatic voltage control (AVR) function, and various kinds of monitoring and display. A microprocessor for controlling a protection function or the like; A gate driver for outputting a pulse width modulation (PWM) control signal of the rectifier and a pulse width modulation (PWM) control signal of an inverter based on a pulse width modulation (PWM) control signal of the microprocessor; Keypads for allowing the operator to operate for various function setting, monitoring control and set value control, and various status display as well as LCD for menu display and set value indicator when setting the function.

The microprocessor includes: an output voltage controller for controlling the output voltage by controlling the PWM rectifier for a DC AVR function; A battery charging control unit controlling a charging voltage and a charging current of the battery; A line voltage monitoring unit for monitoring input and output voltages and performing display control and alarm control thereof; A mode setting unit for storing and managing various mode setting values; A main control unit for controlling each unit and controlling selection of system operating conditions, alarm control, various protection functions and bypasses; And a pulse width modulation generator for generating a pulse width modulation signal for controlling the gate of the inverter under the control of the main controller and outputting the pulse width modulation signal to the gate driver.

When the keypad and the LCD are separately configured, an 8-bit microcontroller can be used as an input / output controller to communicate with the microprocessor so that independent configuration is possible and the key input processing and display control functions of the microprocessor are controlled. Can be configured to share.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a block diagram illustrating a UPS system according to an embodiment of the present invention, FIG. 3 is a block diagram illustrating an internal functional block of the microprocessor of FIG. 2, and FIG. 4 is another embodiment of an all-Igency UPS system according to the present invention. Fig. 5 is a simplified circuit diagram of an all-IGBIS system according to the present invention.

2 to 5, the all-iSIV UPS system according to the present invention includes a first transformer 12 for converting an input power input through a three-phase input switch 21 into a single phase and the first transformer 12; Distribution switch 22 for switching the input power input through the transformer 12, and input filter 13 for filtering the voltage / current of the power input through the distribution switch 22 to the load side through the primary coil And a pulse width modulation (PWM) rectifier 14 for stabilizing the filtered voltage / current with respect to the input filter 13, a battery 15 for supplying an uninterruptible power supply, and a power supply for the battery 15 during power failure. Converts into an AC power and outputs it to the load side, or the inverter 16 receives the input power from the load side in normal state, converts it into DC power and charges the battery 15, the inverter 16 and the PWM. Output load side rectifier 14 Connected to the output filter 17 for filtering and outputting the load side output power to the inverter 16 side during normal power supply and the output of the inverter 16 to the load side power during power failure; A three-phase output switch for stabilizing power at high speed by outputting the output of the second transformer 18 and the output filter 17 and the SCR 11 through the second transformer 18 to convert the output power into three phases. 23, an input voltage Vi and an input current Is at the rear end of the input switch, an output voltage Vo and an output current Ip at the load side connection terminal, and a DC voltage Vd at the battery. First and second high speed detectors 80 and 81 for detecting the signals detected using the current transformer CT and the transformer PT at high speed without a delay time by the resistance circuit; 2 Input / output voltage and current and DC voltage detected by the high-speed detector 80 and 81 A microprocessor 900 for controlling uninterruptible control, automatic voltage control (AVR), and various monitoring, display and protection functions by setting various functions by inputting a key, and pulse width modulation of the microprocessor ( The PWM rectifier 14 outputs a pulse width modulation (PWM) control signal based on a PWM control signal and outputs a pulse width modulation (PWM) control signal of the inverter 16, and various functions. Keypad 100 to allow the operator to operate for setting and monitoring control and set value control, and LCD 110 for displaying the menu and set value indicators when setting the function as well as various status display do.

Here, the transformer (PT), the current transformer (CT), etc. for detecting the voltage and current of the input and output terminals in the drawing is not shown in the drawing, but the detection in the UPS system circuit is obvious to those skilled in the art. To omit them.

In addition, the SCR 11 is installed in any one-phase power line of the three-phase power line in parallel with the PWM rectifier 14, and configured to control the emergency shutoff lamp by the microprocessor 900.

On the other hand, the microprocessor 900 is to control the core functions of the present invention by a program as shown in FIG.

The microprocessor 900, the output voltage control unit 92 for controlling the output voltage by controlling the pulse width modulation (PWM) rectifier 14 IGBT for the DC AVR function, and the charging voltage of the battery 15 and Battery charge control unit 94 for controlling the charging current, the line voltage monitoring unit 95 for monitoring the input and output voltage, and display control and alarm control, and the setting value for each mode is stored and managed A mode setting unit 96 for controlling each unit, a main control unit 93 for controlling selection of system operating conditions, control of test operation, alarm control, various protection functions and bypasses, and each unit The pulse width modulation (PWM) for generating a pulse width modulation (PWM) signal for the gate control of the inverter 16 by the control of the main control unit 93 according to the control function of the output to the gate driver 70 foot It consists of a part 91.

As shown in FIG. 7, when the keypad and the LCD are configured as independent controllers, as shown in FIG. 4, an 8-bit microcontroller is used as the input / output controller 120 to display the microprocessor 900. It can be configured to communicate with and can be configured to share the microprocessor's key input processing and display control functions.

Referring to the operation and effects of the present invention configured as described above are as follows.

The present invention simultaneously performs the function as an uninterruptible power supply and an AVR function, and operates as a highly efficient high-function online UPS through software main control. In order to maximize the efficiency at the available line voltage, the inverter controls the output voltage to a constant voltage and performs the DC AVR function that controls the buffer voltage between the output and the input so that the output power is supplied from the line. The various parameters related to the system are stored in the keypad.

First, the basic flow will be described with reference to the circuit of FIG. 5. The input power Vi is inputted through the three-phase input switch 21 to supply power input through the first transformer 12 to the primary coil. Output to the load side through. At this time, the voltage and current of the pulse width modulation (PWM) rectifier 14 are controlled to control the output voltage Vo to perform the DC AVR function. The PWM rectifier 14 is pulse width modulated (PWM) controlled by the control of the microprocessor 900.

In a normal power input situation, the output load side voltage Vo is connected to the inverter 16, and the inverter 16 is converted into a DC voltage by the control of the microprocessor 900 to charge the battery 15. .

When the input power is out of power, the inverter 16 is controlled by the control of the microprocessor 900 so that the DC power of the battery 15 is converted into AC power and supplied to the output load side through an output filter. It will work as.

The PWM control of the present invention is used for sine wave voltage control and inverter sine wave voltage control of the rectifier, and is more complicated in the control method than the conventional bipolar PWM method, but uses a unipolar PWM method that can reduce the ripple voltage by about 2 times. This is controlled by the PWM generator 91 on the internal program of the microprocessor 900 of FIG. The sinusoidal frequency output from the inverter may be set by the keypad and may be operated differently from the line frequency. That is, when the high speed detector 80 detects the input voltage Vi, the frequency is detected by zero crossing of the voltage, and when the input frequency and the output frequency are different, the PWM is controlled according to the set output frequency to automatically output the output frequency. You can tune to the set frequency.

The output voltage control unit 92 controls the function of the automatic voltage regulator (AVR) that matches the measured output voltage with the reference output voltage. The voltage control and output is performed to obtain responsiveness and stability to the load. Perform the current compensation control function. The first and second high speed detectors 80 and 81 detect the input voltage and the input current, the output voltage and the output current, and perform PWM processing to match the set output voltage and the output current. The voltage and current of the pulse width control (PWM) rectifier 14 are controlled to perform output voltage and output current compensation to perform a DC AVR function.

The battery charge control unit 94 performs a floating charge for charging up to a general float charging voltage, and even charging for charging up to a maximum charging voltage at the time of initial installation or charging after being discharged to a battery low voltage. Limited to maximum charging current. When the charging current reaches 10% or less of the maximum charging current value during even charging, it enters the floating charging. The charging current control calculates the effective current based on the difference between the input current and the output current and detects the battery charging current.When charging by limiting to the maximum charging current value and reaching full charge, the charging current is reduced by the constant voltage control function. Charge current responsiveness is determined by the charge control gain. In the temperature compensation of the even charging voltage, if the temperature drops below room temperature, the charging voltage is increased. Temperature compensation at temperatures above room temperature uses positive temperature compensation, and compensation at low temperatures uses negative temperature compensation.

The three-phase voltage monitoring unit 95 determines whether the normal and abnormality of the three-phase voltage is a voltage difference from the normal voltage, and if the value is larger than the specified value, the inverters are operated. This is to monitor and control the input voltage, and it is possible to eliminate the frequent change between the three-phase operation and the inverter operation through the hysteresis voltage at the boundary of the three-phase voltage drop when detecting the three-phase voltage.

In detecting the abnormality of the three-phase voltage, the detection time constant of the three-phase voltage can be used to reduce the sensitivity of the three-phase voltage.If the frequency of the three-phase voltage exceeds the allowable value of change from the specified value, the operation is not performed in three-phase. Only the inverter operates and sends the output to the battery voltage.

In other words, the voltage monitoring applies the system hysteresis voltage, reduces the frequent change by using the system voltage time constant, and operates the inverter only without operating as a three-phase voltage when it is out of the system abnormal frequency or the system abnormal voltage. Operating only the inverter without operating with the three-phase voltage is to cut off the three-phase voltage, that is, the input voltage to the output load by cutting off the SCR 11 under the control of the microprocessor 900, the inverter 16 By operating the means to convert the charging power of the battery 15 to AC power to output to the load side output voltage (Vo).

The setting unit 96 for each mode is for setting various setting values, and sets and stores various setting values by menu selection of the keypad 100. Then, as a selection function, it is possible to select whether the operating frequency of the system is 60 kHz or 50 kHz, select whether to operate the system automatically when all batteries are discharged by the inverter operation and the 3-phase voltage comes in. Select relay contact terminal (a contact and b contact) operation method of board.

Also, if the gain is not correct when accepting or outputting numerical values from analog data for fine calibration, an error will occur in the processor, and the gain needs to be readjusted.

This can be adjusted in fine calibration parameters, where the battery voltage gain is the measurement gain of the battery voltage, the output voltage gain is the measurement gain of the output voltage, the output current gain is the measurement gain of the output current, and the charge current gain is the charge current. The measured gain of the input voltage gain adjusts the measured gain of the input voltage. These variables are displayed on the LCD 110 using the rated output current. As the output voltage gain increases, the value displayed on the LCD in 3-phase mode increases and decreases in constant voltage control in inverter mode.

The main control unit 93 controls the respective units and controls the PWM generating unit 91 in accordance with the control function of each unit to execute the main words of the actual all-Issue UPS system. In the alarm function, the buzzer does not sound at the normal three-phase voltage, and the buzzer sounds when the inverter is operated at an abnormal three-phase voltage. The buzzer sounds differently by distinguishing inverter operation, abnormality caused by protection function, and battery low status.

When the inverter is operating, the buzzer sounds, and when the alarm silent switch of the keypad 100 is pressed, the buzzer does not sound without pressing the switch again. In case of an abnormal state, the buzzer will sound continuously, and if the momentary overload is not abnormal, the buzzer will sound continuously and if the overload is released, the buzzer will not sound. The buzzer also sounds while the All-Issue YouTube system is stopped.

The protection function controls the battery undervoltage state, overcurrent, overload, battery abnormality, bypass overcurrent and the like as a protection function.

The battery low voltage generates a battery low voltage signal when the battery voltage is discharged to 85% of the electric shock voltage and the output voltage is not maintained to the allowable value. At this time, the inverter operates for 30 seconds at maximum. When the 3-phase voltage is restored from the battery low voltage, the inverter returns to normal operation.

The overcurrent stops the system in order to protect the inverter when the overcurrent continuously occurs over 300% due to the output current exceeding the load state in the inverter operation.

Overload is to protect the inverter from overload. If the output current is greater than the accumulated amount of up to 1 minute due to the overload set during operation over the rated current, it is recognized as overload.

Battery abnormality generates an abnormal signal and stops the inverter when the battery voltage is discharged to 85% of the rated voltage in the inverter operation. If the input power is applied, the battery will be alarmed even when the battery is open. In this case, the inverter will continue to operate and will return to normal when the battery is connected.

Bypass overcurrent turns off the bypass switch to protect the bypass switch when an output short or fault occurs when operating on a three-phase voltage. The reference value of the abnormal current is an overcurrent value.

When the test terminal of the keypad is pressed to test the inverter regardless of the three-phase voltage, the test function turns off the SCR 14 to operate the inverter for 10 seconds before entering normal operation.

Initialization functions include fault initialization, parameter initialization, and system initialization. Fault initialization removes past fault records and prepares them for readiness. Parameter initialization sets all variables or selection functions to their default values. System initialization restarts the system.

Meanwhile, when the keypad and the LCD are configured as independent controllers, the input / output controller 120 which is an 8-bit microcontroller communicating with the microprocessor 900 may be further configured as shown in FIG. 4. Independently configured keypad and LCD control panel has a state diagram showing the flow of the system at the top as shown in FIG. "Inverter" to indicate the presence of a signal, "Bypass" to supply the input power to the output, "Fault" to indicate that the system is abnormal, and "Overload".

In the LCD 110, the first line represents the overall situation of the UE, and the second line represents various internal variables of the UE. Battery voltage capacity, battery voltage, battery current, output voltage, output current, input voltage, input current, output frequency, temperature, status display and the number of power failure, date and time, etc., the display selection is up and down of the keypad 100 Use keys to read the value.

The "Mode" of the keypad 100 enters or exits a menu and controls the movement of a variable, and the up and down keys change the type and display variables of a variable value and an alarm. To change the off state, "O", "I" means that the menu is selected or the parameter is set, the system is stopped and operated, and the system is restarted in the event of a fault.

The UPS system of the present invention by the microprocessor performing the above functions, the three-phase operation, the inverter operation and the bypass control, the state is as shown in Figure 6a to 6e.

Normal operation is a three-phase operation mode, as shown in FIG. 6A, by using an input power source, the pulse width modulated (PWM) rectifier 14 is controlled to charge the DC AVR and the battery 15, and the inverter 16 It is normal operation to supply stable power to output load by function.

As illustrated in FIG. 6B, the blackout operation is operated as an inverter mode in which the power supply of the battery 15 is output to the load side by controlling the inverter 16 when a power failure of the input power is detected.

In the power failure return, as shown in FIG. 6C, the power supply of the input controls the pulse width modulated (PWM) rectifier 14 to recharge the DC AVR and the battery 15, and is also output by the function of the inverter 16. Control is returned to the normal operation of supplying stable power to the load.

Bypass, as shown in FIG. 6D, does not control the inverter, that is, the UPS does not operate and controls the bypass function in which the input power is transferred to the load side three-phase output switch 23 as it is, and the UPS side It is to charge the battery (15).

As shown in FIG. 6E, the emergency bypass is provided with a maintenance bypass switch (MBS) in parallel with the UPS system of the present invention so that input power is transmitted to the load side through the emergency switch, and the SCR 11 is provided. It is to prevent the operation of the UPS in case of troubleshooting or other emergency.

As described in detail above, the present invention is an all-Igei UPS system, which can also function as an AVR function in order to maximize efficiency at a three-phase I / O voltage. It has the effect of providing a high power factor, high performance PU system.

Claims (3)

A first transformer for converting the input power input through the three-phase input switch into a single phase; A distribution switch for switching the input power input through the first transformer; An input filter for filtering voltage / current through the primary coil, the power input through the distribution switch; A pulse width modulator (PWM) rectifier for stabilizing the filtered voltage / current for the input filter; A battery for supplying uninterruptible power; An inverter for converting the battery power into AC power and supplying stable power to a load side during a power failure; An output filter connected between the inverter and the output load side of the rectifier to filter the load side output power to the inverter side during a normal power supply and the output of the inverter to the load side power during a power failure; A second transformer connected to the output filter and converting output power into three phases; A three-phase output switch for stabilizing power through a second transformer and outputting the output of the output filter and the SCR; An input voltage Vi and an input current Is at the rear end of the input switch, an output voltage Vo and an output current Ip at the load side connection terminal, and a DC voltage Vd at the battery are respectively detected. First and second high speed detectors for detecting signals detected using the CT and the transformer PT at high speed without delay time by a resistance circuit; Input / output voltage and current and DC voltage detected by the first and second high speed detectors are inputted, and various functions are set by key input to control uninterrupted control, automatic voltage control (AVR) function, and various kinds of monitoring and display. A microprocessor for controlling the protection function; A gate driver for outputting a PWM control signal of the inverter based on a pulse width modulation (PWM) control signal of the microprocessor; And 3, characterized in that it comprises a keypad for allowing the operator to operate for various function setting and monitoring control and set value control, and a status display, and a display (LCD) for displaying menus and setting values when setting functions. All inputs and outputs all idle UPS system. The method of claim 1, The microprocessor includes: a DC voltage control unit through the pulse width modulation (PWM) rectifier for a DC automatic voltage control (AVR) function; A battery charging control unit controlling a charging voltage and a charging current of the battery; A three-phase voltage monitoring unit for monitoring the input and output voltages and performing display control and alarm control thereof; A mode setting unit for storing and managing various mode setting values; A main control unit for controlling each unit and controlling selection of system operating conditions, alarm control, various protection functions, and bypass; And And a PWM generator for generating a PWM signal for controlling the gate of the inverter under the control of the main controller and outputting the PWM signal to the gate driver. The method according to claim 1 or 2, Three-phase input / output characterized in that the keypad and the display (LCD) are configured as independent controllers by communicating with the microprocessor using an 8-bit microcontroller that shares key input processing and display control functions as an input / output controller. All-Igency UPS System.

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