KR101680025B1 - Multi phase alternation method of parallel ups for increasing efficiency and light weight of ups - Google Patents

Abstract

A multi-phase alternation method of a parallel uninterruptible power supply (UPS) for increasing the efficiency of a UPS and developing a lightweight UPS according to the present invention is to reduce the ripples of the output voltage and current of an inverter, a frequency for switching a switching frequency and the power loss of the inverter by using an interleaving method of inputting a switching control signal so that the switching control signal can be turned by 360/{(total number of inverters)*(inverter order number - 1)} for each inverter when a switching control means inputs the switching control signal into the switching element of each inverter in an inverter module that is mounted on a UPS and has two or more inverters, which have two or more switching elements connected by a bridge, connected in parallel.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-phase alternating method of a parallel UPS for increasing the efficiency of a UPS and reducing the weight of the UPS,

The present invention relates to a multiphase alternating method of a parallel UPS for increasing the efficiency and weight of a UPS. More particularly, the present invention relates to a method of interleaving a switching device of an inverter installed in an uninterruptible power supply (UPS) And more particularly, to a multiphase alternating method of a parallel UPS for increasing efficiency and lighter weight of a UPS in which the efficiency of the UPS is improved by controlling the UPS efficiency.

Generally, an uninterruptible power supply (UPS) is a device for supplying a stable AC power to a load by overcoming a power failure that may occur in a commercial power supply, and includes a rectifying part, an inverter, and a battery.

The uninterruptible power supply supplies AC power to the inverter when AC power is supplied and the AC power is supplied to the inverter. In addition, the power supply abnormality And always supplies stable power.

In the case of the uninterruptible power supply unit, two or more uninterruptible power supply units share output terminals, and a parallel configuration has been used for a long time. In recent years, uninterruptible power supply units have been configured as modules, A module-type uninterruptible power supply that can flexibly cope with maintenance or failure situations is most commonly used.

Meanwhile, the main topology portion of the power converter of the inverter installed in the uninterruptible power supply can be largely divided into an active element and a passive element. At this time, Passive inductors and capacitors.

On the other hand, when the two or more uninterruptible power supply units or two or more inverters are connected in parallel, the conduction loss of the electric element is reduced, and the heat management is facilitated, so that the optimum design of the heat sink having a considerable effect on the size and weight of the system is easy .

In addition, if the inverter is controlled by an interleaving method, the inductance can be reduced to half, and the amount of current flowing to the electric device can be reduced by half.

In this case, when the inductance and the amount of current are halved, the size of the core and the wire is reduced, and the height of the passive element is significantly reduced. However, the actual weight and the size can not be significantly reduced, In addition to being difficult to control, higher performance MCUs must be installed.

In addition, since the overall cost is increased, the UPS is not actively used except for a special case. However, if the interleaving control method is applied to the parallel UPS, the disadvantages of the conventional interleaving method mentioned above are not considered at all, .

On the other hand, in the inverter, a power loss is generated from the switching element at the time of the switching operation. Regardless of the switching frequency, the same amount of loss is generated when the switching state is switched once.

For example, assuming that the loss occurring in one switching cycle is 1 mW, when the 1 kHz switching frequency is driven, the on-off state and the off-on state progress over 2000 times per second, resulting in a loss of 2 W per second .

If driving at 10kHz, 20W is lost per second with the same principle.

In other words, the switching loss is perfectly proportional to the switching frequency, and for any reason reducing the switching frequency leads to a reduction in the switching loss.

On the other hand, the prior art of the present invention is filed and registered as a "Rectifier and inverter interleaving method for reducing neutral line harmonic current of an uninterruptible power supply unit" of Patent Registration No. "10-1555480" A method of controlling a rectifier PWM signal and an inverter PWM signal of a transformer-type double conversion type uninterruptible power supply unit by connecting a signal processing unit for an inverter through a GPIO pin, wherein the signal processing unit for rectifying unit sets a GPIO pin as an output, A step of changing the output signal of the GPIO pin at a time when the rectifying unit PWM counter value becomes 0 when the rectifying unit signal processing unit is set to 0; A step of detecting a time point at which the input signal changes from Low to High using the inverter signal processing unit GP A step of converting the PWM counter value for inverter at the time when the PWM counter value for the rectification part detected by the IO pin becomes 0 and confirming the phase of the inverter PWM signal by using the converted inverter PWM counter value, And determining whether the inverter switching frequency is changed by comparing the final PWM counter value for the inverter converted by the inverter signal processing unit with a value for making a phase difference of 180 degrees with the rectified PWM signal.

Korean Patent Publication No. 1999-0032204 (May 05, 1999) Korea Patent Registration No. 10-1555480 (2015.09.25) Korea Patent Registration No. 10-1617346 (2016.05.02)

In order to solve the above problems, the present invention has an advantage of an uninterruptible power supply unit connected in parallel and controls an inverter installed in an uninterruptible power supply unit in an interleaving manner to reduce power loss of the inverter and ripple of the output voltage Phase alternating method for increasing the efficiency and reducing the weight of the UPS.

각도 틀어지도록 스위칭 제어 신호를 입력하는 인터리빙(Interleaving) 방식을 사용함으로써 인버터의 출력 전압 전류의 리플과, 스위칭 주파수를 스위칭시키기 위한 주파수, 및 인버터의 전력 손실을 감소시킨다.In order to accomplish the above object, a multiphase alternating method of a parallel UPS for increasing the efficiency and weight of a UPS according to the present invention is a method of replacing two or more switching devices connected to an Inverter When the switching control means inputs switching control signals to the switching elements of the respective inverters, the switching control signals for the respective inverters

By using an interleaving method of inputting a switching control signal so as to turn an angle, the ripple of the output voltage current of the inverter, the frequency for switching the switching frequency, and the power loss of the inverter are reduced.

The multiphase alternating method of the parallel UPS for increasing the efficiency and lightening of the UPS according to the present invention having the above-mentioned procedure controls the inverter mounted on the uninterruptible power supply unit by the interleaving method while maintaining the advantages of the uninterruptible power supply unit connected in parallel The power loss of the inverter and the ripple of the output voltage can be reduced.

In addition, the present invention can lower the manufacturing cost of the UPS with improved performance by modifying only the control algorithm without changing the hardware in the conventional uninterruptible power supply system.

In FIG. 1, the left side is an inverter module to which the present invention is applied, the right side is a general inverter module, the switching elements of the left inverter module are switched to 10 kHz by applying an interleaving method, and the switching elements of the right inverter module are interleaved 20 kHz,
2 is a diagram showing control signals input to A, B, C, D, E and F in FIG. 1,
3 shows a first embodiment of an inverter,
4 shows a second embodiment of the inverter,
5 shows the first, second, third and fourth offset adjustment circuits,
6 is a diagram for explaining a dead time generated by adjusting a DC offset voltage of a sine wave,
7 is a view for explaining a ripple voltage of an inverter module to which the present invention is applied,
FIG. 8 is a diagram illustrating power loss of an inverter module to which the present invention is applied; FIG.

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

각도 틀어지도록 스위칭 제어 신호를 입력하는 인터리빙(Interleaving) 방식을 사용함으로써 인버터(1)의 출력 전압 전류의 리플과, 스위칭 주파수를 스위칭시키기 위한 주파수, 및 인버터(1)의 전력 손실을 감소시킨다.As shown in FIGS. 1 and 2, a multi-phase alternating method of a parallel UPS for increasing the efficiency and reducing the weight of the UPS according to the present invention is implemented in an uninterruptible power supply (UPS) (Bridge) In an inverter module in which two or more connected inverters 1 are connected in parallel, when the switching control means 3 inputs switching control signals to the switching elements of the respective inverters 1, Signal

The frequency for switching the switching frequency and the power loss of the inverter 1 are reduced by using the interleaving method of inputting the switching control signal so as to turn the angle of the inverter 1 by using the ripple of the output voltage current of the inverter 1,

에서 첫번째 인버터(1)의 스위칭 소자가 스위칭 제어 신호를 입력받고, 두번째 인버터(1)는 순번이 2번이므로

에서 두번째 인버터(1)의 스위칭 소자가 스위칭 제어 신호를 입력받으며, 세번째 인버터는 순번이 3번이므로

에서 세번째 인버터(1)의 스위칭 소자가 스위칭 제어 신호를 입력받는다.For example, if the number of all the inverters 1 is three, the order of the first inverter 1 is one

The switching element of the first inverter 1 receives the switching control signal, and the second inverter 1 has the order number of 2

The switching element of the second inverter 1 receives the switching control signal, and the third inverter has the order number of 3

The switching element of the third inverter 1 receives the switching control signal.

The uninterruptible power supply (UPS) includes a battery, a charging circuit for receiving the commercial power and charging the battery, a booster circuit for boosting the DC voltage of the battery, and a booster circuit for boosting the booster And an inverter 1 for converting a DC power source of the battery into an AC power source and supplying it to a load.

As shown in FIG. 3, the inverter 1 includes an AC power output unit 5 for switching the DC power supply to convert the DC power into an AC power, and a controller 5 for filtering the output signal of the AC power output unit 5, And a filter unit 7 for converting the AC signal into an AC signal.

3, the AC input voltage is converted into a square wave pulse waveform by the ON and OFF operations of the switching element, and the DC input voltage is applied to the drain terminal A positive DC power source is connected and turned on or turned off according to a control signal of the switching control means 3 inputted to the gate terminal so that a positive DC power is supplied to the filter unit 7 A drain terminal connected to a source terminal of the first switching device 9 and a negative terminal connected to a source terminal of the first switching device 9, A second switching device which is turned on or turned off according to the control signal of the switching control means 3 inputted to the gate terminal and supplies or does not supply the negative DC power to the filter unit 7 11).

The AC power output unit 5 has a first capacitor 13 connected to the drain terminal of the first switching device 9 and an other electrode grounded to output an AC component included in the positive DC power source to the ground, And a second capacitor 15 having one electrode connected to the source terminal of the second switching element 11 and the other electrode grounded to output the AC component included in the negative DC power supply to the ground.

In the first embodiment of the AC power output unit 5, the first switching device 9 and the second switching device 11 are alternately turned on according to the control signal of the switching control means 3, ) Or turned off, and a square wave pulse is outputted to the source terminal of the first switching device 9, and the rectangular wave pulse is converted into an AC signal of a sinusoidal wave form through the filter unit 7.

The filter unit 7 mounted in the first embodiment of the AC power output unit 5 includes a first inductor 17 whose one end is connected to the source terminal of the first switching device 9, And a third capacitor (19) having one electrode connected to the other end of the first inductor (17) and the other electrode grounded. According to the frequency of the AC signal output from the AC power output section (5) The inductive reactance of the third capacitor 19 and the capacitive reactance of the third capacitor 19 are changed to output a sinusoidal AC power of 60 Hz.

The switching control means 3 for controlling the first switching device 9 and the second switching device 11 of the AC power output unit 5 receives the triangular wave as the inverting input terminal and the sine wave Sine wave is inputted and the voltage of the sine wave inputted to the non-inverting input terminal is higher than the triangular wave inputted to the inverting input terminal, the voltage of the sine wave inputted to the non-inverting input terminal is outputted to the inverting input terminal A first comparator 21 for outputting a low signal when the input signal is smaller than the input triangular wave and a second comparator 21 for outputting a voltage level of a high signal and a low signal output from the first comparator 21, A first switching element driver 23 for adjusting the voltage level to turn the element 9 on or off and supplying the voltage to the gate terminal of the first switching element 9, A sine wave is input, and a triangular wave Is inputted and the voltage of the triangular wave inputted to the non-inverting input terminal is higher than that of the sine wave inputted to the inverting input terminal, while the voltage of the triangular wave inputted to the non-inverting input terminal is inputted to the inverting input terminal A second comparator 25 for outputting a low signal when the voltage is lower than a sine wave and a second comparator 25 for comparing a voltage level of a high signal and a low signal outputted from the second comparator 25, A second switching element driver 27 for adjusting the voltage level to turn on or turn off the first switching element 11 to a gate terminal of the second switching element 11, A first triangle wave generator 29 for supplying the inverted input terminal of the first comparator 21 and the non-inverted input terminal of the second comparator 25 and a non-inverting input terminal of the first comparator 21 by generating a sine wave of a predetermined frequency, And an inverting input of the second comparator 25 A first sine wave generator 31 to be supplied to the chair.

The first sine wave generator 31 includes a first pulse width modulation unit for outputting a pulse width modulation signal for generating a sine wave with reference to a lookup table, And a first sine wave generator for filtering the pulse width modulated signal output from the pulse width modulator and converting the sine wave into a sine wave.

In the look-up table, a step angle is stored as an index, and the first pulse width modulator adjusts a sine wave frequency according to a change width of a step angle relative to a time.

4, the DC input voltage is converted into a square wave pulse waveform by the on and off operations of the switching element, (+) DC power source is connected to the drain terminal of the third switching transistor 3 and is turned on or turned off according to the control signal of the switching control means 3 inputted to the gate terminal. And a switching control means (3) connected in parallel to the third switching device (33) and connected to a positive (+) DC power supply to a drain terminal and input to a gate terminal, A fourth switching element 35 which is turned on or turned off according to a signal and a drain terminal connected to the source terminal of the third switching element 33 and a source ) Terminal of the switching control means 3 connected to the negative (- A fifth switching device 37 which is turned on or turned off according to a signal of the first switching device 35 and a drain terminal connected to the source terminal of the fourth switching device 35, (6) which is turned on or turned off according to a control signal of a switching control means (3) connected to a gate terminal and a negative (-) DC power source is connected to a source terminal Device < / RTI >

The switching control means 3 alternately turns on the pair of the third switching device 33 and the sixth switching device 39 or a pair of the fourth switching device 35 and the fifth switching device 37 The filter unit 7 rectifies the square wave signal outputted from the source terminal of the third switching device 33 and the fourth switching device 35 to generate a sine wave Type AC signal and supplies it to the load.

The first to sixth switching elements 9 to 39 may be a bipolar junction transistor (BJT), an insulated gate bipolar junction transistor (IGBT), a metal oxide semiconductor field effect transistor (MOSFET), and a high electron mobility transistor (HEMTs).

The filter unit 7 mounted to the second embodiment of the AC power output unit 5 includes a second inductor 41 whose one end is connected to the source terminal of the fourth switching device 35, And a fourth capacitor 43 whose one electrode is connected to the other end of the second inductor 41 and the other electrode is connected to the source terminal of the third switching device 33. The AC power output unit 5 The inductive reactance of the second inductor 41 and the capacitive reactance of the fourth capacitor 43 are changed in accordance with the frequency of the AC signal outputted from the second embodiment of the present invention to output a sinusoidal AC power of 60 Hz.

In the second embodiment of the AC power output section 5, the switching control means 3 for controlling the third to sixth switching devices 33 to 39 are constituted such that a sine wave is inputted to the non- When the voltage of the sine wave input to the non-inverting input terminal is higher than that of the sine wave input to the inverting input terminal while the triangle wave is inputted to the terminal, the voltage of the triangular wave inputted to the inverting input terminal Inverted input terminal of the third and sixth comparators 45 and 47, a third · sixth comparator 45 and 47 for outputting a low signal when the input signal is lower than a sine wave input to the non-inverting input terminal, The voltage level of the third and sixth switching elements 33 and 39 is adjusted to a voltage level that turns on or off the third and sixth switching elements 33 and 39, 39) for supplying the gate signal to the gate terminal of the non-inverting input terminal When a triangular wave is input and a sine wave is input to the inverting input terminal and a voltage of the triangle wave inputted to the non-inverting input terminal is higher than a sine wave input to the inverting input terminal, a high signal is outputted. A fifth comparator 53,55 for outputting a low signal when the voltage is lower than a triangular wave inputted to the non-inverting input terminal, and a fourth comparator 53,55 for outputting a high signal outputted from the fourth · fifth comparator 53,55, The voltage level of the signal and the low signal is adjusted to the voltage level that turns on or off the fourth and fifth switching devices 35 and 37 to turn on the fourth and fifth switching devices 35 , 37) for generating a triangular wave of a predetermined frequency to supply the inverted input terminal of the third · sixth comparator (45, 47) to the inverting input terminal of the fourth · fifth comparator (45, 53, 55), and a second triangle wave generator 61 for supplying a sine wave of a predetermined frequency to the non- And a second sinusoidal wave generator 63 for supplying the inverted input terminal of the third · sixth comparators 45 and 47 and the inverting input terminal of the fourth · fifth comparator 53 and 55.

The second sine wave generator 63 includes a second pulse width modulation unit for outputting a pulse width modulation signal for generating a sine wave referring to a lookup table, And a second sine wave generator for filtering the pulse width modulated signal output from the pulse width modulator to convert the sine wave into a sine wave.

In the look-up table, a step angle is stored as an index, and the second pulse width modulator adjusts a sine wave frequency according to a variation range of the step angle relative to the time.

In the first and second embodiments of the AC power output section 5, the first and second switching elements 9 and 11 and the third, fourth, fifth, and sixth switching elements 33, 35, 37, The first and second switching elements 9 and 11 and the third, fourth, fifth, and sixth switching elements 33, 35, 37, and 39 are turned on or turned off, A large amount of current may flow to the inverter 1 in a short state, resulting in a large loss.

In order to solve the above problems, the first embodiment of the AC power output unit 5 is configured such that the time when the first switching device 9 is turned on and the time when the second switching device 9 is turned on, The first and second switching elements 9 and 11 are provided with a dead time for turning off the first and second switching elements 9 and 11 between the time when the first and second switching elements 11 turn on, , 11) are turned on at the same time. The first dead time adjusting unit (65)

5, the first dead time adjusting unit 65 is connected to the non-inverting input terminal of the first comparator 21 and the inverting input terminal of the second comparator 25, The first and second offset adjustment circuits 67 and 69 adjust the DC offset level of the sine wave input to the noninverting input terminal of the second comparator 25 and the sine wave input to the inverting input terminal of the second comparator 25, respectively.

As shown in FIG. 4, the second embodiment of the AC power output section 5 includes a time when the third and sixth switching elements 33 and 39 are turned on and a time when the fourth and fifth switching elements 33 and 39 are turned on. The dead time for turning off the third, fourth, fifth, and sixth switching devices 33, 35, 37, and 39 during the time when the devices 35 and 37 are turned on, To prevent the third, fourth, fifth, and sixth switching elements 33, 35, 37, and 39 from being turned on at the same time.

As shown in FIG. 5, the second dead time adjusting unit 71 is connected to the non-inverting input terminal of the third and sixth comparators 45 and 47 and the inverting input terminals of the fourth and fifth comparators 53 and 55, respectively Which adjusts the DC offset level of the sine wave inputted to the noninverting input terminal of the third · sixth comparator 45 or 47 and the sine wave inputted to the inverting input terminal of the fourth · fifth comparator 53 or 55, And four offset adjustment circuits 73 and 75.

내지

범위 내에서 조정하여 출력하는 오피 앰프(79)로 이루어질 수 있다.The first offset adjustment circuit 67 to the fourth offset adjustment circuit 75 are the first embodiment shown in FIG. 5, in which a positive DC voltage (+ V) is supplied to one end and a negative DC voltage A variable resistor 77 whose resistance ratio varies depending on the position of the tap Tap so as to output a direct current voltage between the negative DC voltage and the positive DC voltage via the divided voltage output terminal 78; One end of which is connected to the inverting input terminal of the operational amplifier 79 and the other end of which is connected to the operational amplifier 79 and the other end of which is connected to the operational amplifier 79, A second resistor 83 connected to the output terminal of the variable resistor 77 and a DC offset voltage of the sine wave when the sine wave is input to the non-

To

And an operational amplifier 79 for adjusting the output within a range.

6 is a graph showing a result of applying a dead time using the first offset adjustment circuit 67 to the fourth offset adjustment circuit 75. FIG.

The multiphase alternating method of the parallel UPS for increasing the efficiency and lightening of the UPS according to the present invention having the above-described procedure is characterized in that the inverter 1 mounted on the uninterruptible power supply unit is interleaved The power loss of the inverter 1 and the ripple of the output voltage can be reduced.

Further, the present invention is advantageous in that it can be implemented without increasing the cost by modifying only the control algorithm without changing the hardware in the conventional uninterruptible power supply system.

Further, the present invention can reduce the ripple of the output voltage and the output current of the inverter 1 by using the interleaving method when controlling the switching elements of the inverter 1. [

In addition, when the switching device of the inverter module to which the present invention is applied is driven at 10 kHz and the switching device of the general inverter module is driven at 20 kHz, the output voltage ripple of the inverter module to which the present invention is applied and the general inverter module are shown in FIG. As described above, the inverter module to which the present invention is applied is lower than the output voltage ripple of the inverter driven at 20 kHz, even though the driving frequency is slower.

As shown in FIG. 7, the ripple of the inverter module to which the present invention is applied is 0.06 V, and the ripple of the general inverter module is 0.25 V.

Since switching loss increases in proportion to the number of switching elements, the lowering of the switching frequency of the switching element is good for loss. However, if the switching frequency is lowered, the ripple increases and the switching frequency is lowered There was a limit.

However, according to the present invention, the absolute value of the loss waveform of the switching element is taken and the cumulative average is deducted from the loss of about 50%.

8 shows a result of the fact that the resistance loss of the base or the gate which is not considered in the simulation circuit design is excluded, which is also a loss which is absolutely proportional to the switching frequency.

When the present invention is applied, the switching frequency of the switching element can be lowered each time the inverter module is added, which can lead to an increase in efficiency.

1. Inverter 3. Switching control means
5. AC power output part 7. Filter part
9. First switching element 11. Second switching element
13. First capacitor 15. Second capacitor
17. First inductor 19. Third capacitor
21. First Comparator 23. First Switching Element Driver
25. Second Comparator 27. Second Switching Element Driver
29. First triangle wave generator 31. First sine wave generator
33. Third switching element 35. Fourth switching element
37. Fifth switching element 39. Sixth switching element
41. Second inductor 43. Fourth capacitor
45. Third comparator 47. Sixth comparator
49. Third switching element driving part 51. Sixth switching element driving part
53. A fourth comparator 55. A fifth comparator
57. Fourth switching element driving part 59. A fifth switching element driving part
61. Second triangle wave generator 63. Second sine wave generator
65. A first dead time adjusting unit 67. A first offset adjusting circuit
69. Second Offset Adjustment Circuit 71. Second Dead Time Adjustment Unit
73. Third offset adjustment circuit 75. Fourth offset adjustment circuit
77. Variable resistors 79. Operational amplifier
81. A first resistor 83. A second resistor

Claims (4)

In an inverter module in which two or more inverters (1) are connected in parallel and two or more switching elements are connected to a bridge while being mounted on an uninterruptible power supply (UPS)
When the switching control means 3 inputs switching control signals to the switching elements of the respective inverters 1, the switching control signals for the respective inverters 1

By using an interleaving method of inputting a switching control signal so that the angle is turned off,
The ripple of the output voltage current of the inverter 1, the frequency for switching the switching frequency, and the power loss of the inverter 1,
The inverter (1) includes an AC power output section (5) for switching a DC power source to convert it into an AC power source,
And a filter unit (7) for filtering the output signal of the AC power output unit (5) and converting it into an AC signal of a sinusoidal waveform,
The AC power output unit 5 converts a DC input voltage into a square wave pulse waveform by an ON and OFF operation of the switching device and connects a positive DC power source to a drain terminal (Not shown) which is turned on or turned off according to the control signal of the switching control means 3 inputted to the gate terminal and supplies or does not supply the positive DC power to the filter unit 7 )Wow,
The control of the switching control means 3, which is connected to the source terminal of the first switching device 9, the negative terminal of which is connected to the negative terminal, And a second switching device (11) which is turned on or turned off according to a signal and does not supply or supply negative DC power to the filter part (7)
The AC power output unit 5 includes a first capacitor 13 having a positive electrode connected to the drain terminal of the first switching device 9 and a negative electrode grounded to output an AC component included in the positive DC power supply to the ground,
Further comprising a second capacitor (15) connected to a source terminal of the second switching element (11) and a positive electrode grounded to supply an AC component included in the negative DC power supply to the ground,
The AC power output unit 5 turns on or off the first and second switching devices 9 and 11 alternately according to the control signal of the switching control means 3. [ And,
A square wave pulse is output to the source terminal of the first switching device 9,
The rectangular wave pulse is converted into an AC signal in the form of a sinusoidal wave through the filter unit 7,
The filter unit 7 of the AC power output unit 5 includes a first inductor 17 whose one end is connected to a source terminal of the first switching device 9,
And a third capacitor 19 having one electrode connected to the other end of the first inductor 17 and the other electrode grounded,
The inductive reactance of the first inductor 17 and the capacitive reactance of the third capacitor 19 change in accordance with the frequency of the AC signal output from the AC power output section 5 to output a sinusoidal AC power of 60 Hz,
The switching control means 3 for controlling the first switching device 9 and the second switching device 11 of the AC power output unit 5 receives the triangular wave as the inverting input terminal and the sine wave Sine wave is inputted and the voltage of the sine wave inputted to the non-inverting input terminal is higher than the sine wave inputted to the inverting input terminal, the voltage of the sine wave inputted to the non- A first comparator 21 for outputting a low signal when the input signal is smaller than a triangular wave inputted to the inverting input terminal,
The voltage level of the High signal and the Low signal outputted from the first comparator 21 is set to a voltage level that turns on or off the first switching device 9 A first switching element driver 23 for adjusting and supplying the gate signal to the gate terminal of the first switching element 9,
When a sine wave is input to the inverting input terminal and a triangle wave is inputted to the non-inverting input terminal and the voltage of the triangular wave inputted to the non-inverting input terminal is higher than the sine wave inputted to the inverting input terminal, A second comparator 25 for outputting a low signal when the voltage of the triangular wave inputted to the terminal is smaller than the sine wave inputted to the inverting input terminal,
The voltage level of the High signal and the Low signal outputted from the second comparator 25 is set to a voltage level that turns on or off the second switching device 11 A second switching element driver 27 for adjusting and supplying the gate signal to the gate terminal of the second switching element 11,
A first triangle wave generator 29 for generating a triangular wave of a predetermined frequency and supplying the inverted input terminal of the first comparator 21 and the non-inverted input terminal of the second comparator 25,
And a first sinusoidal wave generator (31) for generating a sine wave of a predetermined frequency and supplying the generated sinusoidal wave to a noninverting input terminal of the first comparator (21) and an inverting input terminal of the second comparator (25) Multiphase Alternating Method of Parallel UPS for Increasing and Lightening.
delete delete In an inverter module in which two or more inverters (1) are connected in parallel and two or more switching elements are connected to a bridge while being mounted on an uninterruptible power supply (UPS)
When the switching control means 3 inputs switching control signals to the switching elements of the respective inverters 1, the switching control signals for the respective inverters 1

By using an interleaving method of inputting a switching control signal so that the angle is turned off,
The ripple of the output voltage current of the inverter 1, the frequency for switching the switching frequency, and the power loss of the inverter 1,
The inverter (1) includes an AC power output section (5) for switching a DC power source to convert it into an AC power source,
And a filter unit (7) for filtering the output signal of the AC power output unit (5) and converting it into an AC signal of a sinusoidal waveform,
The AC power output unit 5 converts a DC input voltage to a square wave pulse waveform by an ON or OFF operation of the switching device and connects a positive DC power source to a drain terminal, A third switching element 33 which is turned on or turned off according to a control signal of the switching control means 3 inputted to the gate terminal,
And is turned on according to a control signal of the switching control means 3 connected in parallel to the third switching device 33 and connected to the positive terminal of the drain terminal and the gate terminal thereof, ) Or a fourth switching element 35 that is turned off,
The switching control means 3 (3) having a drain terminal connected to the source terminal of the third switching device 33, a negative (-) DC power source connected to the source terminal thereof, A fifth switching device 37 that is turned on or turned off according to a control signal of the first switch 37,
And a drain terminal connected to a source terminal of the fourth switching device 35 and a negative terminal connected to a source terminal of the fourth switching device 35, And a sixth switching device 39 turned on or turned off according to a control signal of the first,
The switching control means 3 alternately turns on a pair of the third switching device 33 and the sixth switching device 39 or a pair of the fourth switching device 35 and the fifth switching device 37 Turn On, Turn Off,
The filter unit 7 rectifies the square wave signal output from the source terminal of the third switching device 33 and the fourth switching device 35 and converts the rectangular wave signal into an AC signal of a sinusoidal wave form,
The filter unit 7 mounted on the AC power output unit 5 includes a second inductor 41 having one end connected to the source terminal of the fourth switching device 35,
One terminal of which is connected to the other terminal of the second inductor 41 and the other terminal of which is connected to the source terminal of the third switching element 33,
The inductive reactance of the second inductor 41 and the capacitive reactance of the fourth capacitor 43 change in accordance with the frequency of the AC signal output from the AC power output section 5 to output a sinusoidal AC power of 60 Hz,
The switching control means 3 for controlling the third to sixth switching devices 39 to 39 in the AC power output section 5 receives a sine wave as a noninverting input terminal and a triangular wave as an inverting input terminal When the voltage of the sine wave input to the non-inverting input terminal is higher than that of the triangular wave inputted to the inverting input terminal, the voltage of the triangular wave inputted to the inverting input terminal is higher than that of the sine wave input to the non- Third and sixth comparators 45 and 47 for outputting a low signal when the input signal is low,
The voltage level of the high signal and the low signal outputted from the third and sixth comparators 45 and 47 is turned on or off by the third and sixth switching devices 33 and 39. [ The third and sixth switching element drivers 49 and 51 for adjusting the voltage level to turn off the first and sixth switching elements 33 and 39 and supplying them to the gate terminals of the third and sixth switching elements 33 and 39,
When a triangular wave is inputted to the non-inverting input terminal and a sine wave is inputted to the inverting input terminal and the voltage of the triangular wave inputted to the non-inverting input terminal is higher than the sine wave inputted to the inverting input terminal, (55) for outputting a low signal when the voltage of the sine wave inputted to the non-inverting input terminal is smaller than the triangular wave inputted to the non-inverting input terminal,
The voltage levels of the High signal and the Low signal output from the fourth and fifth comparators 53 and 55 are turned on or off by the fourth and fifth switching devices 35 and 37, Fifth switching element driving parts 57 and 59 for adjusting the voltage level to turn off the fourth and fifth switching elements 35 and 37 and supplying them to the gate terminals of the fourth and fifth switching elements 35 and 37,
A second triangle wave generator 61 for generating a triangular wave of a predetermined frequency and supplying the inverted input terminal of the third · sixth comparator 45 and 47 and the non-inverting input terminal of the fourth · fifth comparator 53 and 55,
And a second sinusoidal wave generator 63 for generating a sine wave of a predetermined frequency and supplying the inverted input terminal of the third · sixth comparator 45 and 47 and the inverting input terminal of the fourth · fifth comparator 53 and 55 Wherein the first and second UPSs are connected in parallel.

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