KR101083819B1 - Uninterrupted and High Efficiency Power Supply Equipment with Power Factor Compensating and No Transformer using Economic Mode - Google Patents

Abstract

The present invention relates to a power factor correction transformer-less high efficiency charger inverter device, and more particularly, to a power factor correction transformer-less high efficiency charger inverter device using an ECO MODE having a bypass circuit.
The power factor correction transformerless high efficiency charger inverter device to which the ECO MODE according to the present invention according to the present invention is applied includes an input noise filter 309 for filtering an AC input voltage; A rectifier leg (201) connected in series with said noise filter (309); A battery 111 that charges power in normal times and supplies power with charged energy in an emergency; Connected between the rectifier leg 201 and the battery to charge the battery 111 with a DC voltage rectified by the rectifier leg 201 or to supply a current discharged from the battery 111 to the power system A discharge leg 203; An inverter leg 209 for converting the DC voltage supplied from the rectifier leg 201 or the DC voltage supplied from the battery 111 into an AC voltage; A first thyristor (311) for switching the AC voltage of the inverter leg (209); A first switch 121 for forming a bypass circuit 319 to bypass the power conversion circuit when the input voltage is within a predetermined variation range; A second thyristor (313) connected in series with the first switch to switch AC power; A second switch (123) for connecting the battery to an input voltage such that the battery (111) is charged by an input voltage; An output noise filter 315 connected in series with the second thyristor 313 and the first thyristor 311 of the bypass circuit 319 to remove noise; A third switch connected in series with the output noise filter to turn on or off a power system; When the fluctuation range of the input voltage is within the preset fluctuation range while the overall control is performed, the first circuit 121, the second switch 123, and the second thyristor 313 are turned on to turn on the bypass circuit ( 319 and the control unit 305 for turning on the first thyristor 311 and turning off the second thyristor 313 when the power is passed through the input voltage and the variation range of the input voltage is outside the preset variation range. ; And a display unit 307 for outputting and displaying the set value input by the user according to the instruction of the controller 305.

Description

Uninterrupted and High Efficiency Power Supply Equipment with Power Factor Compensating and No Transformer using Economic Mode}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charger inverter device, and more particularly, to a power factor correction transformerless high efficiency charger inverter device employing an ECO MODE (Economic mode) having a bypass circuit.

Uninterruptible power supplies are largely on-line, off-line, and line interactive. Among them, the on-line method is also known as the inverter method. The commercial power is converted into DC power by the converter circuit, and the converted DC power is charged to the battery through the charging circuit, and then converted into AC power through the inverter circuit. This is how we send it to the output. In the case of the on-line method, the output is always sent through the inverter circuit, which ensures a stable output and has high precision.

The off-line method outputs commercial AC power as output, and the battery is charged through a charging circuit. When a power failure occurs, the inverter circuit is driven to output power stored in the battery to the output. At this time, the switching board (ATS or RELAY) on the output side is switched to the inverter circuit, and a slight time delay (about 10 ms) occurs. In this method, unlike the on-line method, if the input AC commercial power does not fall below the power failure detection level, the changed power until then may be supplied to the load-side output, which may affect the output.

In the line interactive method, a battery and an inverter circuit part are always connected to each other to convert power. In addition, when the commercial AC power supply is also connected together, when the commercial AC power supply becomes lower than the power failure detection level, the power supply of the battery can be used in a very short time by turning off the switching panel of the input terminal. Due to the advantages and disadvantages of each of these methods, an on-line uninterruptible power supply having excellent stability has been used for important systems such as communication systems and medical systems.

On the other hand, in such an on-line type of uninterruptible power supply, high power factor is required in response to environmental regulations of input power, which is being tightened, and high efficiency is required at national level. In addition, according to the market situation, the size and weight of the system are required to be reduced, and the cost is also required.

1 is a circuit diagram of a typical high power factor rectifier-inverter type online uninterruptible power supply. As shown in FIG. 1, in the conventional general single-phase high power factor uninterruptible power supply, T1 and D1 are connected in series, T2 and D2 are connected in series, and connected to each other in parallel to perform power factor correction and charging. Full bridge type inverter 105 having the same structure as the full-bridge rectifier 103 and the full-bridge rectifier 103, and converts the direct current into alternating current, and the rectified by the rectifier 103 Battery 111 for storing the is to be connected in parallel between these rectifiers 103 and the inverter 105.

On the other hand, in the uninterruptible power supply, the battery 111 is generally not connected to a large number of series voltages due to problems such as maintenance or price, so as not to be used up. Therefore, the input stage transformer 101 is used to balance the voltage between the input voltage Vs and the voltage of the battery 111 at the input stage. Similarly, an AC output inverter inverted from the battery 111 voltage charged at the output stage connected to the load 109. An output stage transformer 107 is used to output the voltage. As such, the input stage transformer 101 lowers the high input AC voltage to the low input AC voltage, and the rectifier 103 connected thereto charges the battery 111 at a high power factor through current control. The inverter 105 converts the low DC voltage into an AC voltage and boosts the low AC voltage to a commercial AC voltage through the output stage transformer 107.

However, in the conventional uninterruptible power supply having such a configuration, a power loss occurs in the input stage transformer 101 and the output stage transformer 107, and the efficiency of the system decreases due to an increase in the conduction current of the switch due to a low DC voltage. there was. The actual rated AC voltage 220V, battery rated voltage 192V, rated power 3kW system efficiency is about 82%, the efficiency improvement is urgently needed.

Power factor compensation transformerless high efficiency charger inverter device applying the ECO MODE according to the present invention for solving the above problems does not use the input transformer and the output transformer, as well as the state of the input voltage to exhibit high efficiency and high power factor Accordingly, when the state of the input voltage is good, the power is transmitted through the bypass circuit so that there is no power conversion loss occurring during conversion in the input / output power conversion element, and when the deviation of the allowed voltage fluctuates, the bypass circuit is opened. It is an object of the present invention to provide a power factor compensation transformer-less high efficiency charger inverter device using an ECO MODE, which improves efficiency while allowing power to be transmitted through an input / output power conversion element to maintain a voltage variation within a certain range.

The power factor correction transformerless high efficiency charger inverter device to which the ECO MODE according to the present invention for achieving the above object is achieved comprises: an input noise filter 309 for filtering an AC input voltage; A rectifier leg (201) connected in series with said noise filter (309); A battery 111 that charges power in normal times and supplies power with charged energy in an emergency; Connected between the rectifier leg 201 and the battery to charge the battery 111 with a DC voltage rectified by the rectifier leg 201 or to supply a current discharged from the battery 111 to the power system A discharge leg 203; An inverter leg 209 for converting the DC voltage supplied from the rectifier leg 201 or the DC voltage supplied from the battery 111 into an AC voltage; A first thyristor (311) for switching the AC voltage of the inverter leg (209); A first switch 121 for forming a bypass circuit 319 to bypass the power conversion circuit when the input voltage is within a predetermined variation range; A second thyristor (313) connected in series with the first switch to switch AC power; A second switch (123) for connecting the battery to an input voltage such that the battery (111) is charged by an input voltage; An output noise filter 315 connected in series with the second thyristor 313 and the first thyristor 311 of the bypass circuit 319 to remove noise; A third switch connected in series with the output noise filter to turn on or off a power system; When the fluctuation range of the input voltage is within the preset fluctuation range while the overall control is performed, the first circuit 121, the second switch 123, and the second thyristor 313 are turned on to turn on the bypass circuit ( 319 and the control unit 305 for turning on the first thyristor 311 and turning off the second thyristor 313 when the power is passed through the input voltage and the variation range of the input voltage is outside the preset variation range. ; And a display unit 307 for outputting and displaying the set value input by the user according to the instruction of the controller 305.

The power factor compensation transformerless high-efficiency charger inverter device applying the ECO MODE according to the present invention, since power is transmitted through the ECO MODE (Economic mode) applying the bypass circuit, the transformer loss and power conversion elements in the input transformer and output transformer In this case, the loss caused by the high conduction current is minimized, thereby increasing the efficiency of the system.

1 is a circuit diagram of a conventional transformer charger inverter device,
2 is a circuit configuration diagram of a transformerless inverter inverter device,
3 is a system configuration diagram of a power factor compensation transformerless high efficiency charger inverter device to which the ECO MODE is applied.

Hereinafter, an embodiment of a power factor compensation transformerless high efficiency charger inverter device to which an ECO mode is applied to the present invention will be described in detail with reference to the accompanying drawings.

The power factor correction transformerless high efficiency charger inverter device to which the ECO MODE is applied may include an input noise filter 309 for filtering an AC input voltage; A rectifier leg (201) connected in series with said noise filter (309); A battery 111 that charges power in normal times and supplies power with charged energy in an emergency; Connected between the rectifier leg 201 and the battery to charge the battery 111 with a DC voltage rectified by the rectifier leg 201 or to supply a current discharged from the battery 111 to the power system A discharge leg 203; An inverter leg 209 for converting the DC voltage supplied from the rectifier leg 201 or the DC voltage supplied from the battery 111 into an AC voltage; A first thyristor (311) for switching the AC voltage of the inverter leg (209); A first switch 121 for forming a bypass circuit 319 to bypass the power conversion circuit when the input voltage is within a predetermined variation range; A second thyristor (313) connected in series with the first switch to switch AC power; A second switch (123) for connecting the battery to an input voltage such that the battery (111) is charged by an input voltage; An output noise filter 315 connected in series with the second thyristor 313 and the first thyristor 311 of the bypass circuit 319 to remove noise; A third switch connected in series with the output noise filter to turn on or off a power system; When the fluctuation range of the input voltage is within the preset fluctuation range while the overall control is performed, the first circuit 121, the second switch 123, and the second thyristor 313 are turned on to turn on the bypass circuit ( 319 and the control unit 305 for turning on the first thyristor 311 and turning off the second thyristor 313 when the power is passed through the input voltage and the variation range of the input voltage is outside the preset variation range. ; And a display unit 307 for outputting and displaying the set value input by the user according to the instruction of the controller 305.

In addition, the power factor correction transformer-less high efficiency charger inverter device to which the ECO MODE for the present invention is applied includes an emergency circuit 317 for providing an emergency connection path when the power system fails and the power system cannot be normally operated; And a fourth switch 127 for connecting an input voltage to an output through the emergency circuit 317.

1 is a circuit diagram of a conventional transformer-type charger inverter device, a conventional single-phase high power factor uninterruptible power supply is connected in series T1 and D1, and T2 and D2 are connected in series for power factor correction and charging And a full bridge type inverter 105 having the same structure as the full bridge type rectifier 103 and the full bridge type rectifier 103 formed by connecting them in parallel to each other again and converting direct current into alternating current; In addition, the battery 111 storing the electricity rectified in the rectifier 103 is connected in parallel between the rectifier 103 and the inverter 105.

2 is a circuit diagram of a power factor correcting transformerless uninterruptible power supply according to a preferred embodiment of the present invention. Rectifiers and inverters are connected in series with two switches (T5 and D5, T8 and D8) each made of Insulation Gated Bipolar Transtors (IGBTs), which are hereinafter referred to as 'rectifier legs' 201 and 'inverter legs' ( 209). Commonly used between the rectifier leg 201 and the inverter leg 209, specifically in front of the inverter leg 209, in common with them so as to operate as a full bridge rectifier and a full bridge inverter as in the prior art. Leg 207 is inserted. Of course, this common leg 207 can also be implemented with two IGBT switches T7 and D7 connected in series. On the other hand, immediately after the rectifier leg 201, a high input DC voltage passed through the rectifier leg 201 is lowered to a relatively low DC voltage so as to be suitable for charging the battery 111, and the relative output from the battery 111. Charge / discharge leg 203 for boosting a low DC voltage to a relatively high grid voltage, which is also implemented as two switches T6 and D6 connected in series and implemented with IGBT. do. As shown in FIG. 2, diodes connected in parallel to the IGBTs in the switches T5 to T8 D5 to D8 are responsible for replacing the delay current component with a DC circuit and refluxing the bridge in the inductive load.

In FIG. 2, reference numeral L1 denotes an input inductor connected between the input voltage Vs and a connection point of both switches T5 and D5 of the rectifier leg 201, and reference numeral L2 denotes both switches T7 and D7 of the common leg 207. Denotes a battery-side inductor connected between the connection point of < RTI ID = 0.0 >) < / RTI > and battery 111, and reference numeral L3 denotes an output-side inductor connected between the connection point of both switches T8 and D8 of the inverter leg 209 and the load 109. Further, reference numeral Cd denotes a direct current capacitor connected between the rear end of the battery 111 and the front end of the common leg 207.

On the other hand, the common leg 207 switches to the same frequency (for example, 60 Hz) as the input voltage Vs, which is a low frequency, and the rectifier leg 201 and the inverter leg 209 switch to a high frequency so that the fixed frequency is variable. AC power can be obtained. In addition, when the switches T7 and D7 of the common leg 207 are switched to the frequency of the input voltage Vs, the switches T5 and D5, T8, and D8 of the rectifier leg 201 and the inverter leg 209 become unipolar. Since the switching is performed in a unipolar pulse width modulation (PWM) scheme, the switches T5 and D5, T8, and D8 of the rectifier leg 201 and the inverter leg 209 may be independently controlled. .

In this case, the rectifier leg 201 switches in the direction for controlling the input current, while the inverter leg 209 switches in the direction for controlling the output voltage. Meanwhile, the charging / discharging leg 203 operates as a buck converter or step-down converter when charging the battery 111, and is suitable for charging the battery 111 with a high DC voltage passed through the rectifier leg 201. Lower to voltage. On the contrary, during discharge, the battery operates as a boost converter or step-up converter to raise the low battery voltage to the high voltage required by the inverter leg 209.

On the other hand, when the flow of the battery discharge current flowing in the power failure, the diode connected to the upper switch (T6) of the charge-discharge leg 203, its lower switch (D5) and the battery-side inductor (L2) to the boost converter It operates to raise the voltage of the battery 111 to the required DC voltage Vd.

On the other hand, the switches T7 and D7 of the common leg 207 are combined with the switches T8 and D8 of the inverter leg 209 to operate as full-bridge inverters, so that they switch to the frequency of the output voltage. If this is a positive value, the lower switch D7 of the common leg 207 is turned on while the upper switch T7 is cut off. In this state, when the upper switch T8 of the inverter leg 209 is turned on, the DC voltage Vd exits the inverter leg 209 and flows to the current load side, while the lower switch D8 of the inverter leg 209 is turned on. Zero voltage is applied to the load 109, and the output current flows through the switch D7 and the switch D7.

Conversely, when the output voltage is negative, the upper switch T7 of the common leg 207 is turned on while the lower switch D7 is erased. In this state, when the upper switch T8 of the inverter leg 209 is turned on, zero voltage is applied to the load 109 and the output current flows through the switch T7 and the switch T8. On the other hand, when the lower switch D8 of the inverter leg 209 is turned on, the DC voltage -Vd is applied to the load 109 so that the current io has a negative value.

If the power system is normal, the battery is charged. Looking at the current flow at this time, the common leg 207 is switched to the frequency of the input voltage Vs. If the input voltage Vs has a positive value, the common leg The lower switch D7 of 207 is turned on while the upper switch T7 is shut off. On the contrary, when the input voltage Vs has a negative value, the upper switch T7 of the common leg 207 is turned on while the lower switch D7 is cut off. Further, when the input voltage Vs has a positive value, when the lower switch D5 of the rectifier leg 201 is turned on and the upper switch T5 is cut off, the current is of the input side inductor L1 is positive. Direction, and the increased magnetic energy is stored in the input side inductor L1. In this state, when the upper switch T5 of the rectifier leg 201 is turned on and the lower switch D5 is blocked, the magnetic energy stored in the input side inductor L1 is transferred to the direct current side. The same principle works when the input voltage is negative. The operation of the inverter leg 209 is the same as in the case of a power failure, and the charge / discharge leg 203 is connected to the battery side inductor L2 and the battery 111 to charge the battery 111 by acting as a buck converter. The upper switch T6 of the charge / discharge leg 203 is controlled through a constant pulse width modulation, the lower switch D6 is always shut off and the body diode connected thereto circulates the current in the inductor L1. It is conducting when you make it.

Referring to FIG. 3, FIG. 3 is a power system diagram in which a bypass circuit 319 is added to operate in a high efficiency ECO (Economic) mode when electricity is normally drawn. In ECO mode, the allowable fluctuation range of the input voltage to the reference voltage can be set between + -5% and + -15%. When the input voltage is within the set range, the input voltage is operated while bypassing. By bypassing the conversion circuit and supplying an AC output voltage, the system can be maintained in a highly efficient state. At this time, when the fluctuation range of the input voltage is out of the set value or the fluctuation range of the input voltage is ± 15% or more, as shown in FIG.

The fluctuation range of the input voltage is set by input means (not shown) built in the control unit 305, and the set value is displayed on the display unit 307. If the fluctuation range of the input voltage is within the set value, the controller 305 opens the SW4 127 and connects the SW1 121 and the SW2 123 to the SW3 125 so that power is passed through the bypass circuit 319. Causes output The input voltage is output via the second thyristors SCR2 and 313 of the bypass circuit 319 and the noise filter 315. At this time, the first thyristors SCR1 and 311 are turned off to block current from flowing through the power conversion circuit. However, since the input voltage SW2 123 is ON, the battery 111 is charged via the noise filter 309, the rectifier leg 201, and the charge / discharge leg 203. On the other hand, an emergency circuit 317 is provided in case of a failure in the power conversion circuit and the bypass circuit 319. In an emergency, SW1 121, SW2 123, and SW3 125 are opened, and SW4 Connect 127.

Assuming that an abnormal input state (+ -15% or more) of the daily input side power occurs by about 10%, using the bypass circuit 319 in this way, the single phase increases about 3% efficiency and the three phases 7% efficiency. Is increased.

101: input stage transformer,
103: rectifier, 111: battery,
105: inverter, 107: output stage transformer,
109: load,
121: first switch SW1, 123: second switch SW2,
125: third switch SW3, 127: fourth switch SW4,
201: rectifier leg, 203: charge / discharge leg,
207: common leg, 209: inverter leg,
305: control unit, 307: display unit,
309: input noise filter,
311: first thyristor, 313: second thyristor,
315: output noise filter, 317: emergency circuit,
319: bypass circuit,
Cd: DC condenser, Vs: input power,
L1, L2, L3: Inductor, T1-T4: Top Switch,
D1-D4: lower switch

Claims (2)

delete In the power factor correction transformer-less high efficiency charger inverter device,
An input noise filter 309 for filtering the AC input voltage;
A rectifier leg (201) connected in series with said noise filter (309);
A battery 111 that charges power in normal times and supplies power with charged energy in an emergency;
Connected between the rectifier leg 201 and the battery to charge the battery 111 with a DC voltage rectified by the rectifier leg 201 or to supply a current discharged from the battery 111 to the power system A discharge leg 203;
An inverter leg 209 for converting the DC voltage supplied from the rectifier leg 201 or the DC voltage supplied from the battery 111 into an AC voltage;
A first thyristor (311) for switching the AC voltage of the inverter leg (209);
A first switch 121 for forming a bypass circuit 319 to bypass the power conversion circuit when the input voltage is within a predetermined variation range;
A second thyristor (313) connected in series with the first switch to switch AC power;
A second switch (123) for connecting the battery to an input voltage such that the battery (111) is charged by an input voltage;
An output noise filter 315 connected in series with the second thyristor 313 and the first thyristor 311 of the bypass circuit 319 to remove noise;
A third switch connected in series with the output noise filter to turn on or off a power system;
When the fluctuation range of the input voltage is within the preset fluctuation range, power is supplied to the bypass circuit 319 by turning on the first switch 121, the second switch 123, and the second thyristor 313. A controller 305 for turning on the first thyristor 311 and turning off the second thyristor 313 when the fluctuation range of the input voltage is outside the preset variation range;
And a display unit 307 for outputting and displaying the set value input by the user according to the instruction of the controller 305,
An emergency circuit 317 for providing an emergency connection path when a power system fails and the power system cannot be operated normally;
And a fourth switch 127 for connecting an input voltage to an output through the emergency circuit 317.
A common leg 207 is inserted between the rectifier leg 201 and the inverter leg 209 to switch to the same frequency as the low frequency input voltage Vs,
The switch T7 and D7 of the common leg 207 is combined with the switches T8 and D8 of the inverter leg 209 to operate as an inverter of a full bridge structure to switch to the frequency of the output voltage. Power factor compensation transformerless high efficiency charger inverter device using MODE (economic mode).

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