KR20030011415A - Anti-power turbulence system - Google Patents

Abstract

PURPOSE: An anti-power turbulence system is provided to supply a constant voltage regardless of a temporary power failure or a dropping phenomenon of voltage by using a power factor controller, a capacitor, and a bypass output portion. CONSTITUTION: An input monitor portion(10) monitors a power input state of an external power source. A bypass output portion(20) outputs the power of the external power source when the input monitor portion(10) determines the power input state of an external power source as a normal state. An inverter portion(30) inverts AC power to DC power. A converter portion(50) converts the DC power to the AC power. A compensation output portion(60) compensates the converted AC power of the converter portion(50). A main control portion(40) controls operations of the bypass output portion(20), the inverter portion(30), the converter portion(50), the compensation output portion(60) according to a monitoring result.

Description

Power Fluctuation Response System {Anti-Power Turbulence System}

The present invention relates to a power supply response system, and to a power supply response system capable of maintaining stable operation of various electric and electronic equipments because the normal power is always supplied in response to power supply fluctuations such as instantaneous power failure and voltage drop.

In general, various electrical and electronic equipment such as communication equipment, office equipment, computers, precision measuring instruments, motors, and pumps require a stable power supply to prevent malfunctions and prevent damage to circuits or components. Use an Uninterruptible Power Supply (UPS).

The conventional uninterruptible power supply is an off-line method of supplying power by operating an inverter connected to a battery only during a power failure, and supplying DC power to the battery and the inverter even when normal commercial power is supplied. It is divided into on-line method which always operates as an inverter.

In the above-described offline type uninterruptible power supply, the inverter does not operate normally and rectifies and outputs the power supplied from the external power, but when the power supply from the external power supply is suspended or a power failure occurs, the internal power supply is used to output the power. When the external power is supplied or the power failure is solved, the output of the inverter is stopped and the external power is rectified.

In the conventional off-line uninterruptible power supply, since the inverter does not operate normally, it takes a long time to switch from the external power mode to the inverter mode. The output frequency is fluctuated according to the reliability of the power supply, and the inconvenience of having to check the state of the battery manually.

Compared to the above-described off-line type, the uninterruptible power supply of the on-line type has a high output reliability because the input power is output through two conversions while the inverter is operating. The efficiency of the conversion is low, and the cost is high because complicated circuit design and many components are required.

In addition, the conventional uninterruptible power supply generates a lot of losses by operating an inverter using a battery, and in the case of equipment that requires a large amount of starting load such as a motor or a pump, the output capacity is 3 to 3 to cope with the starting load. Inefficient, such as increasing more than five times.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and when the state of the external power input using the PFC (capacitor) and the bypass output unit is normal, directly through the bypass output unit. When power is supplied to the output unit and abnormal power is supplied to the inverter through the compensating output unit, it is possible to cope with power fluctuations such as instantaneous power interruption and voltage drop. It is to provide stable power supply, low loss and high efficiency power supply response system.

1 is a block diagram schematically showing an embodiment of a power supply response system according to the present invention.

Figure 2 is a block diagram showing in more detail an embodiment of a power supply response system according to the present invention.

The power fluctuation response system proposed by the present invention includes an input monitoring unit that monitors a state in which power is input from an external power source and an external power input when the input monitoring unit determines that the input value of the external power source is normal. A bypass output unit for outputting, an inverter unit for converting AC power input from an external power source into a DC power source, boosting and charging the converted DC power source, and a converter for converting DC power supplied from the inverter unit to AC power source. And when the input value of the external power is judged to be abnormal in the input monitoring unit, the AC power supplied from the inverter unit is supplied from the inverter unit to compensate for the power input from the external power source. A bypass output unit and an inverter unit according to the compensation output unit for outputting and the monitoring result from the above-described input monitoring unit; It includes a main control unit for controlling the operation of the compensation output unit.

The inverter unit includes a rectifier for converting AC power input from an external power source into a DC power source, a power factor controller (PFC) for boosting the DC power converted and supplied from the rectifier to a predetermined voltage, and boosting at the PFC. The DC power is made to include a capacitor (capacitor) is charged.

The converter unit is formed by using an insulated gate bipolar transistor (IGBT) module.

The compensation output unit is formed by using a thyristor.

The power supply variation response system of the present invention further includes an output current monitoring unit for monitoring the current for the output power from the bypass output unit and the output power from the compensation output unit.

The power supply response system of the present invention further includes a drive current monitoring unit for monitoring whether an overcurrent is generated when the converter unit is driven.

Next, a preferred embodiment of the power supply response system according to the present invention will be described in detail with reference to the drawings.

First, an embodiment of the power supply response system according to the present invention, as shown in Figure 1, the input monitoring unit 10 for monitoring the state of the power input from the external power source, the external from the input monitoring unit 10 When the input value of the power source is determined to be normal, the bypass output unit 20 outputting the external power source as it is, and the AC power input from the external power source is converted into DC power, and the converted DC power is boosted and charged. The inverter unit 30, the converter unit 50 for converting the DC power supplied from the inverter unit 30 into AC power, and the input value of the external power in the input monitoring unit 10 are abnormal. When it is determined that the compensation output unit 60 is supplied from the inverter unit 30 is supplied from the converter unit 50 converted by the AC power supplied to compensate for the power input from the external power source, and the A bite Main controller 40 for controlling the operation of the bypass output unit 20, the inverter unit 30 and the converter unit 50 and the compensation output unit 60 in accordance with the monitoring results from the power monitoring unit 10 It is made to include.

The inverter unit 30 includes a rectifier 32 for converting AC (AC) power input from an external power source into a direct current (DC) power, and a DC voltage converted and supplied from the rectifier 32. And a capacitor 36 charged with the DC power boosted by the PFC 34.

For example, the PFC 34 boosts the input voltage of DC 220V, which is converted into direct current by the rectifier 32, to DC 300 to 400V, and supplies the same to the capacitor 36.

By boosting the voltage as described above and charging the capacitor 36, the output power can be maintained at AC 300 to 400 V even when the voltage drops to AC 80 V instantaneously when the input power is AC 220 V, for example.

Therefore, in the power supply response system according to the present invention, it is possible to perform a compensation function for an instantaneous power failure without installing a battery.

2, the power input from the external power source is filtered through the EMI filter 70 and then supplied to the rectifier 32, the input monitoring unit 10, and the bypass output unit 20. Configure.

By installing the EMI filter 70 as described above, it is possible to eliminate the influx of electromagnetic waves generated from the main power supply line, and to supply high-quality power.

The converter unit 50 is formed by using an insulated gate bipolar transistor (IGBT) module.

The IGBT module is driven at a 20 kHz pulse width modulation frequency in order to convert a DC voltage into an AC voltage.

The compensation output unit 60 is formed using a thyristor element.

By using the thyristor element as described above, it is possible to maintain the transfer time within 3 msec. Therefore, the effect of momentary power failure has little effect on the equipment.

In addition, an embodiment of the power supply response system according to the present invention is an output monitoring unit 26 for monitoring the output power from the bypass output unit 20 and the output power from the compensation output unit 60. More).

In addition, the embodiment of the power supply response system according to the present invention further includes an output current monitoring unit 66 for monitoring the current of the power output from the bypass output unit 20 or the compensation output unit 60. .

In addition, an embodiment of the power supply response system according to the present invention further includes a drive current monitoring unit 56 for monitoring whether an overcurrent is generated when the converter unit 50 is driven.

The main controller 40 determines whether the input power is in a normal state or an abnormal state (abnormal state) based on the signal transmitted from the input monitoring unit 10, and in the abnormal state, the converter unit 50. An invert controller 42 for controlling the IGBT module to perform compensation output through the compensation output unit 60, the input monitoring unit 10, the output monitoring unit 26, and the output current monitoring unit 66; When a system failure is detected from the input / output controller 44 which receives the supervisory signal of the control unit and controls the input and the output, and the supervisory signals transmitted from the output current monitor 66 and the drive current monitor 56. The watch dog 46 which automatically recovers and maintains normal operation, and the input monitoring unit 10, the output monitoring unit 26, the output current monitoring unit 66, and the driving current monitoring unit continuously described above. Bypass monitoring unit 20 and the inverter receives the monitoring signal of 56 It includes a monitoring unit 48 for checking the operating state of the unit 30 and the converter unit 50 and the compensation output unit 60 and the like.

The power charged in the capacitor 36 is supplied to a switch mode power supply (SMPS) 38 according to the control signal of the main controller 40, the input / output control unit 44, and the power. It is configured to be supplied to the invert control section 42 of the main control section 40 via the supply device 38.

As described above, the DC power supplied to the invert control unit 42 is converted into AC power through the IGBT module of the converter unit 50, and then supplied to the compensation output unit 60 and output as output power.

As shown in FIG. 2 between the converter unit 50 and the compensating output unit 60, a sinusoidal waveform is obtained by removing harmonics from signals generated by the IGBT modules of the invert control unit 42 and the converter unit 50. The resonant transformer 80 for generating the

As shown in FIG. 2, harmonics (bypass output unit 20) are applied to various electrical and electronic equipment connected in the output power output through the bypass output unit 20 and / or the compensating output unit 60. EMI filter 72 for filtering in order not to be affected by the harmonics generated while passing through the compensation output unit 60).

The output monitoring unit 26 monitors the voltage output during the inverting operation by the invert control unit 42 of the main control unit 40 to maintain a constant (for example, within ± 1%), and output power If the line is shorted, it performs the function of stopping the supply of the output voltage.

The output current monitoring unit 66 monitors the current of the power output through the bypass output unit 20 or the compensation output unit 60 to monitor the inside and outside of the system (connected various electrical and electronic equipment). In order to prevent a failure, when the output current is rapidly increased, it is detected and transmitted to the main controller 40, and the input / output controller 44 of the main controller 40 stops the output and generates an alarm sound. do.

The drive current monitoring unit 56 protects the system by monitoring whether an overcurrent occurs when the IGBT module of the converter unit 50 is driven, and monitors the balance of the IGBT plus phase and the IGBT negative phase to prevent system failure. It performs the function.

In addition, the main controller 40 is configured to monitor the voltage charged in the capacitor 44 to constantly monitor the overvoltage and the low voltage, and to generate an alarm sound immediately when an abnormality occurs.

Next will be described the operation of the power supply response system according to the present invention configured as described above.

First, when power is input from an external power source, the input monitoring unit 10 monitors this and, in a normal state (for example, within ± 10% of the normal value), the input / output control unit 44 of the main control unit 40. In such a way, the output is controlled through the bypass output unit 20.

At this time, the output monitoring unit 26 and the output current monitoring unit 66 monitors the output power, and when an abnormal state is detected, the main control unit 40 controls it.

As for a part of the external power input, the AC power is converted into the DC power through the rectifier 32 described above, the voltage is boosted through the PFC 34, and the capacitor 36 is charged.

On the other hand, when the abnormal state in which the voltage of the power input from the external power source is instantaneously detected from the input monitoring unit 10, the converter unit 50 in the invert control unit 42 of the main control unit 40 described above. Drive the IGBT module to generate a sine wave using the resonant transformer 80 and perform the compensating output through the compensating output unit 60.

At this time, if the inverter control unit 42 drives the converter unit 50, the DC power charged in the capacitor 36 is transferred through the power supply device 38 to the invert control unit 42 of the main control unit 40. ) Is supplied to the invert control unit 42, the DC power is converted into AC power again while passing through the converter unit 50, and the output power converted into AC power is the resonance transformer ( Harmonics are removed at 80 to form a sine wave, and are output through the compensation output unit 60.

The invert control unit 42 automatically recognizes the frequency of the AC power input as described above to match the frequency of the AC power output to the same frequency and to match the phase of the input voltage and the phase of the output voltage in phase. In the control unit 50 is transmitted to the control unit 50 and the resonance transformer (80).

In the above description of the preferred embodiment of the power supply variation response system according to the present invention, the present invention is not limited to this, but can be modified and implemented in various ways within the scope of the claims and the detailed description of the invention and the accompanying drawings. This also belongs to the scope of the present invention.

According to the power fluctuation response system according to the present invention made as described above, unlike the conventional on-line method, since the invert drive method is not used, it is possible to realize a low loss and high efficiency.

In addition, since the PFC and the capacitor are used to boost and charge, there is no need for a separate battery, thereby reducing costs, and reducing the time and cost of replacing the battery, and miniaturizing the battery without requiring a space for installing the battery.

By adopting the thyristor, it is possible to maintain the switching time within 3 msec, so that the compensation effect of the momentary power failure can be obtained very efficiently.

In addition, according to the power fluctuation-response system according to the present invention, it is possible to supply stable power by compensating and outputting the output power in response to power fluctuations such as instantaneous power interruption and voltage drop of an external power supply with little switching time. It is possible for electrical and electronic equipment to prevent breakdown or damage caused by sudden power failure and to maintain stable operation.

Claims (5)

An input monitoring unit for monitoring a state in which power is input from an external power source, A bypass output unit for outputting the external power input as it is when the input monitoring unit determines that the input power of the external power is in a normal state; An inverter unit for converting AC power input from an external power source into DC power and boosting and charging the converted DC power; A converter unit for converting DC power supplied from the inverter unit into AC power; When the input monitoring unit judges that the input value of the external power is abnormal, compensation is provided by compensating and outputting the power input from the external power by receiving the AC power supplied from the inverter unit and converted by the converter unit. An output unit, And a main control section for controlling whether the bypass output section, the inverter section, and the converter section and the compensation output section operate according to the monitoring result from the input monitoring section. The rectifier of claim 1, wherein the inverter unit comprises: a rectifier for converting AC power input from an external power source into DC power; A PFC for boosting the DC power supplied by being converted from the rectifier to a predetermined voltage; And a capacitor for charging the DC power boosted by the PFC. The method of claim 1, wherein the converter unit is made using an IGBT module, And a compensation output unit using a thyristor element. The output monitoring unit according to claim 1, further comprising: an output monitoring unit for monitoring output power from the bypass output unit and output power from the compensation output unit; An output current monitoring unit for monitoring the current of the power output from the bypass output unit or the compensation output unit; A drive current monitoring unit for monitoring whether an overcurrent is generated when the converter unit is driven; And a resonance transformer provided between the converter unit and the compensation output unit to remove a harmonic from the signal generated by the converter unit to generate a sinusoidal waveform. 5. The compensation controller of claim 4, wherein the main control unit determines whether the input power is in a normal state or in this state based on the signal transmitted from the input monitoring unit. Invert control unit for controlling to perform, An input / output control unit which receives the monitoring signals of the input monitoring unit, the output monitoring unit, and the output current monitoring unit, and controls input and output; A watchdog that automatically recovers and maintains normal operation when a system failure is detected from the monitoring signals transmitted from the output current monitoring unit and the driving current monitoring unit; And a monitoring unit for continuously checking the operating states of the bypass output unit, the inverter unit, the converter unit, and the compensation output unit by receiving the monitoring signals of the input monitoring unit, the output monitoring unit, the output current monitoring unit, and the driving current monitoring unit. Power supply response system.