KR200237460Y1 - Line Interactive Uninterruptible Power Supply with Automatic Voltage Regulation - Google Patents

Abstract

The present invention provides an uninterruptible power supply to secure communication equipment, office equipment, computers, and precision measuring instruments that require a stable power supply from unstable power, and to protect load devices from power disturbances such as power outages, overvoltage, and low voltage. The present invention relates to a line interactive uninterruptible power supply having a function for compensating input current harmonics and having an automatic voltage regulation function which a conventional line interactive type uninterruptible power supply does not have.

Description

Line Interactive Uninterruptible Power Supply with Automatic Voltage Regulation

The present invention provides an uninterruptible power supply that stably supplies power to electrical and electronic devices that require a stable power supply such as communication devices, office devices, computers, and precision measuring instruments, and protects the devices from power disturbances such as power failure, overvoltage, and low voltage. Uninterruptible Power Supply (UPS), which has an automatic voltage regulating function that a conventional line interactive UPS does not have, and has a function for compensating an input current harmonic. It is about.

In general, the UPS is used to protect communication equipment, precision measuring instrument and computer from unstable power supply, and to protect against power disturbance such as power failure, overvoltage and low voltage. There are off-line and off-line interactive UPS.

Fig. 1 shows a circuit diagram of the above-mentioned line interactive UPS, which is composed of an input unit consisting of an EMI / RFI filter and a breaker, an input blocking unit consisting of relays RY5 and RY4, and a relay RY3 and RY2. It consists of a voltage regulator, a DC / AC inverter, a charger, a battery, and the like.

The operation of the line interactive UPS is that the input power is normal ( V _LOW <V _∈ <V _HIGH ), RY5 and RY4 of the switching section are turned ON, RY3 and RY2 of the voltage adjusting section are turned OFF to supply power to the load, and the input power supply V _∈ > V _HIGH In this case, RY5 and RY4 of the switching section and RY2 of the voltage adjusting section are turned on, and RY3 of the voltage adjusting section is turned off to supply the dropping power to the load by the number of taps of T ₂ . And V _∈ <V _LOW On the back, RY5 and RY4 of the switching section and RY3 of the voltage adjusting section are turned on, and RY2 of the voltage adjusting section is turned off to supply the power increased by the number of taps of T ₂ to the load. In case of power failure, the switch part RY5 and RY4 are turned off to separate the input and output, and the DC / AC inverter receives power from the battery and supplies power to the load.

However, when the input power is within the prescribed value, the line interactive UPS supplies the load to the load without any control by the relays RY1, RY2, RY3, RY4, and RY5. There is a problem that can be adversely affected to the equipment to be used, such as damage to the load device or malfunction of the device. In addition, there is a problem that a momentary power failure (0 to 4 msec) is caused by supplying a current to the DC / AC inverter after the switching parts RY5 and RY4 are turned off at the moment of power failure, and the device used may be lost.

In addition, when the input power supply falls below the reference value, the operation of the voltage adjusting section RY3 and V _∈ > V _R : RY3 OFF, RY2 ON V _∈ 10%), and when the input power is out of the standard value, the voltage adjustment part RY3 and RY2 V _∈ <V _R : RY3 ON, RY2 OFF) Drops by a certain voltage. However, the input voltage is V _∈ ) Upper limit ( V _HIGH ) And the lower limit ( V _LOW Input voltage in V _LOW <V _∈ <V _HIGH ), There was a problem that can not be adjusted constantly.

In order to solve the above problems, in order to solve the above problems, two bidirectional switches (S1, S2) and one inductor (L1) are installed in place of RY5, RY4, and voltage adjusting units RY3, RY2 and RY1 of the conventional UPS. With the addition of a transistor, it has an automatic voltage control function and replaces the separation of the input power and the output power used by the relay in case of power failure with a high speed switch to secure the stability and reliability of the power supply.

It also aims to reduce manufacturing costs by reducing the number of devices used in a UPS.

In order to achieve the above object, the present invention provides an input unit consisting of a circuit breaker and an EMI / RFI filter, an inductor (L1) connected in the middle of the lead line of the filter to the input unit, and switches (S1, S2) provided at both ends of the inductor; An inverter and a charger connected to a transistor T1 provided between both ends of the switches, a transistor T2 having one winding connected between the transistor T1 and another lead line of the input unit, and another winding of the transistor T2; A line interactive uninterruptible power supply having an automatic voltage control function including a battery connected to an inverter and a charger, and an output unit drawn from the transistors T1 and T2.

1 is a circuit diagram of a conventional uninterruptible power supply.

2 is a circuit diagram of a line interactive uninterruptible power supply having an automatic voltage regulation function according to the present invention.

<Description of the symbols for the main parts of the drawings>

T1: first transformer RY1 to RY5: relay

11: Breaker 12: EMI / REI Filter

13 Inverter / Charger 14: Load

15 battery L1 inductor

S1, S2: High speed switch T2: Second transformer

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

2 is a circuit diagram of a line interactive uninterruptible power supply having an automatic voltage regulation function according to the present invention, which includes an input unit consisting of a circuit breaker 11 and an EMI / REI filter 12, one inductance L1, and two It consists of fast switches S1 and S2, two transistors T1 and T2, and an inverter / charger 13 and a battery 15.

In more detail, an input portion including a circuit breaker 11 and an EMI / REI filter 12 receiving power supplied from the outside, and a capriline inductance L1 having an intermediate portion connected to one line drawn from the input portion ), A transistor T1 provided between the high speed switches S1 and S2, and one end of the high speed switches S1 and S2, and a transistor T2 having one winding connected to the other lead line of the transistor T1 and the input unit. An inverter / charger 13 connected to the other winding of the transistor T2, a battery 15 connected to the inverter / charger 13, and a load 15 connected to and drawn from the transistors T1 and T2. It consists of the output stage.

The UPS of the present invention configured as described above is loaded by the operation of the transformer T1 and the high speed switches S1 and S2 when the input power is changed by the transformer T1, the inductor L1 and the high speed switches S1 and S2. Supply a constant voltage to.

Furthermore, the inductor L1 facilitates the separation of the input power when the DC / AC inverter / charger 13 supplies current to the load in case of power failure, and the high speed switches S1 and S2 are connected to the relay RY5 of the switching part of FIG. This can be faster than the input power disconnection performed by RY4, and does not cause a momentary power failure on the load 14 side.

Referring to the operation of the line interactive uninterruptible power supply having an automatic voltage regulation function of the present invention, V _∈ <V _R when, T1 _ON <T2 _ON If you run V _O > V _∈ Becomes ( V _R : The desired voltage). At this time,

V _O = V _T + V _C2

Because of T1 _ON and T2 _ON By adjusting V _C2 If you adjust

V _O = V _∈ + V _C2

Because of

V _O = V _∈ + V _C2 = V _R

to be. In other words,

V _C2 = V _R -V _∈

If you adjust to V _O = V _R Becomes

Also, V _∈ > V _R when, T1 _ON > T2 _ON If you run V _o <V _∈ Becomes At this time, the output voltage is

V _O = V _∈ -V _C1 = V _R

to be. In other words

V _C1 = V _∈ -V _R

If you adjust to V _O = V _R Becomes

As mentioned above, unlike the conventional line interactive UPS V _∈ (V _LOW <V _∈ <V _HIGH ) Irrespective of V _O Constantly operate the uninterruptible power supply.

Next, when the power failure is described, at the moment of power failure, the DC / AC inverter supplies power to the load, the inductor L1 serves as a buffer to separate the input power and the output, and the high speed switches S1 and S2 are input. Disconnect the power. In addition, when the input power is restored, it operates as a shock absorber when the power of the input power and the inverter are replaced, and serves as an interface inductor when the high speed switches S1 and S2 are turned on and off.

The line interactive uninterruptible power supply having an automatic voltage regulation function according to the present invention has an automatic voltage regulation function which a conventional line interactive uninterruptible power supply does not have, and the input power source of the conventional relays RY1 to RY5 during power failure. High power stability and reliability are secured by replacing the separation operation with the output power with a high speed switch.

In addition, since the number of devices used in the uninterruptible power supply can be reduced, the manufacturing cost of the uninterruptible power supply can be reduced.

Claims (1)

In an uninterruptible power supply including an input consisting of a circuit breaker and an EMI / REI filter to continuously supply power to the load even in the event of a power failure, Inductor L1 is connected to the lead line of the input unit to facilitate the separation of input power during power failure, and two high speed switches installed at both ends of the inductor L1 to block input power during power failure. (S1, S2); One side winding between the first transformer T1 provided between the switches S1 and S2 and the first transformer T1 and the other lead wire of the input unit to output the voltage of the input power at a constant voltage. A second transformer T2 connected to the second transformer T2; An inverter / charger (13) connected to the other winding of the second transformer (T2) for supplying power to a load in case of power failure, and a battery (15) connected to the inverter / charger (13); And an output unit drawn from the first transformer (T1) and the second transformer (T2).