KR20030012576A - Uninterrupted power supply system for compositeness system - Google Patents

Abstract

PURPOSE: A complex power supply device is provided to supply stably AC power as well as DC power during a power failure period or a driving period by using a hot plug-in method. CONSTITUTION: A rectifier and charger portion(11) is formed with one ore more units(11a to 11n) to rectify AC power to DC power and output a predetermined charging voltage. An auxiliary and main power battery(12) receives a DC voltage from the rectifier and charger portion(11) and outputs the DC voltage to a DC/DC converter portion(13) and a DC/AC inverter portion(14). The DC/DC converter portion(13) receives the DC voltage from the auxiliary and main power battery(12), converts the DC voltage to a predetermined voltage level, and outputs the DC voltage to DC equipment(20) such as a transmitter or a receiver. The DC/AC inverter portion(14) converts the DC voltage of the auxiliary and main power battery(12) to the AC voltage and outputs the AC voltage to AC equipment(30). A control portion(15) includes a plurality of RS-485 communication ports(C11,C13,C14).

Description

Uninterrupted power supply system for compositeness system

The present invention relates to a device for supplying power to a PCS (Personal Communication Service) base station, an unmanned switching center, a relay base station, an Internet service provider, a device using DC and AC power, a communication device, and a communication device. The present invention relates to a composite power supply that stably supplies power for a long time so that power is not interrupted.

Conventional power supply unit accommodates UPS (Uninterrupted Power Supply) and rectifier as separate devices, and in case of power failure, UPS converts DC power of battery into AC and supplies power, and rectifier is normally AC input power The DC converter and the battery are installed in parallel and in parallel to supply DC while supplying a lower voltage to the power supply when the power is discharged.

As such, the conventional power supply device has a decrease in the output area of the base station as the voltage of the battery which is used as a spare power is gradually reduced, the service area is narrowed, and in the case of the exchanger, the call quality has been degraded. It adopts converter method.

In addition, because the equal charging voltage of the battery exceeds the maximum input voltage of the exchange equipment when the AC power is input, the phenomenon that the battery cannot be charged at the equal charging rated voltage of the battery occurs, which causes the battery to always shorten due to lack of charging. There was a problem

Referring to Figure 1 (a), (b), (c) of the conventional power supply attached as follows.

First, the conventional power supply device shown in (a) of FIG. 1 has the advantage that the rectifier output voltage is always constant in a power failure or normal operation state so that the output of the transceiver is always constant, but the UPS is configured in a large capacity. In case of failure, the entire power supply function of the base station is paralyzed, which is not currently used.

In addition, the power supply device shown in (b) of FIG. 1 includes a UPS and a rectifier as a separate system, and requires two sets of batteries, and when the AC input is interrupted and a predetermined time passes, the rectifier side battery voltage is reduced. There is a drawback that the service area of the base station is narrowed since the output is reduced and the output of the transceiver is reduced.

In addition, the power supply device shown in (c) of FIG. 1 is to improve the disadvantages shown in (b) of FIG. 1, and the output of the battery to maintain a constant DC input voltage of the transceiver even if the battery voltage is reduced. By installing a separate booster converter on the side, although improved than the method shown in (b) of Figure 1, but also has a drawback in stable power supply.

Accordingly, the present invention relates to a device for supplying power to various power supplies, and in particular, to improve the disadvantages of the existing equipment to stably supply AC and DC power even during power outages and operation to prevent the interruption and failure of power The purpose is to provide a high reliability composite power supply.

In addition, the present invention is configured by adopting a hot plug-in (Hot Plug-in) method to easily replace and repair the failed unit even during operation by configuring each converter unit to enable parallel operation control of 1 + n Another object is to provide a complex power supply that improves the reliability of the system.

In addition, in the present invention, when a storage battery is installed as a main power source, 1 + n serial / parallel operation control is performed using a conventional two-pack system that uses a separate storage battery to supply power to a converter and an inverter. Another object is to provide a complex power supply that is modularized into one possible system and modified into a compact system.

In addition, another object is to simultaneously control the storage battery and one or more (1 + N) units, namely rectifier and charging unit, DC / DC converter unit and DC / AC inverter unit.

1A is a conventional block diagram illustrating a power supply device in which load is concentrated in one UPS.

Figure 1 (b) is a conventional block diagram showing a power supply having a UPS and a rectifier as a separate system

1 (c) is a conventional block diagram showing a power supply device configured by adding a booster converter for improving the disadvantages of (b) of FIG.

2 is a block diagram schematically showing a composite power supply device according to an embodiment of the present invention;

3 is a block diagram illustrating a more detailed description of the composite power supply of FIG. 2.

4 is a system block diagram showing a composite power supply according to an embodiment of the present invention.

5 is a block diagram showing a control unit of the composite power supply of FIG. 3 according to the present invention;

6 is a block diagram showing an overall plan view of a composite power supply of the present invention;

* Description of the symbols for the main parts of the drawings *

10. --------------------- Combined Power Supply

11 .--------------------- Rectifier and charging part

12 .--------------------- Storage battery

13. --------------------- DC / DC Converter

14. --------------------- DC / AC Inverter

15 .--------------------- Control

DCCT1, DCCT2 ------------ DC Current Detector

In order to achieve the above object, the present invention will be described in detail below with reference to the accompanying drawings, the power supply in accordance with one embodiment.

Rectifier and charging unit capable of direct and parallel operation control consisting of one or more (1 + n) units for receiving AC power and rectifying to DC and outputting a predetermined charging voltage, and a DC voltage output from the rectifier and charging unit. A spare and main power storage battery that is automatically selected for proper quantity according to the capacity capacity ratio of the load, and can be controlled in series and parallel operation, and the voltage outputted from the battery is converted into a DC voltage of a predetermined level, and the transceiver (DC DC / DC converter unit which outputs to the side equipment) and is capable of serial / parallel operation control, which is composed of at least one (1 + n) unit, and receives a voltage output from the battery during a power outage to a predetermined level of AC voltage. It converts and outputs it to other equipment (AC side equipment), and in general, bypasses the input commercial AC voltage to peripheral equipment such as a base station. A DC / AC inverter unit capable of serial and parallel operation control consisting of one or more (1 + n) units for supplying a C power supply, controlling the entire system, automatically charging the storage battery, and also providing the 1 + n It is composed of a high quality composite power supply including a control unit for efficiently controlling parallel operation of two units.

FIG. 2 is a configuration diagram schematically showing the composite power supply device according to the present invention, and FIG. 3 is a block diagram illustrating a detailed description of the composite power supply device of FIG. 2.

2, 3, 4, 5, and 6, the technical configuration and operation function according to the present invention will be described.

First, according to FIG. 3, the composite power supply 10 of the present invention includes a rectifier and a charging unit 11, a spare and main power storage battery 12, a DC / DC converter unit 13, and a DC / AC inverter unit 14. ), The control unit 15 and the like.

The rectifier and the charging unit 11 is composed of one or more (1 + n) units (11a ... 11n) for receiving a three-phase 220V or 380V AC power to rectify to DC and output a predetermined charging voltage Serial and parallel operation control is possible. In other words, the rectifier and the charging unit 11 constituted by 1 + n units and adopting the serial / parallel operation control method, firstly, the DC / DC converter 13 connected to the output terminal of the storage battery 12; And 1 + n additional units connected in series according to the load facility capacity shared by the DC / AC inverter 14 to cope with the load expansion. If the unit breaks down, the other side can control the serial and parallel operation so that the other unit can take over its function, and it is also configured as a hot plug-in type so that the user can easily replace and repair the broken unit even during operation. .

The preliminary and main power storage batteries 12 receive the DC voltage output from the units of the rectifier and the charging unit 11, and are selected in an appropriate quantity according to the facility capacity ratio of the load, and the control unit is configured to perform parallel / parallel operation. (15) is automatically charged, the equipment to supply a predetermined DC voltage to the DC / DC converter unit 13 and the DC / AC inverter unit 14 stably and stably in preparation for normal and blackout It is.

That is, during normal times, the storage battery 12 always maintains an optimal state of charge by the rectifying and charging unit 11 so as to continuously supply a predetermined DC voltage only to the DC / DC converter unit 13, and in case of power failure. The DC / DC converter unit 13 and the DC / AC inverter unit 14 are characterized in that the equipment is provided so as to stably supply a predetermined DC voltage stably.

The DC / DC converter unit 13 receives a predetermined DC voltage output from the preliminary power storage battery 12 and converts it into a DC voltage of a predetermined level and outputs the DC side equipment 20 such as a transceiver or an exchanger. However, serial / parallel operation control composed of at least one (1 + n) units 13a ... 13n is possible.

In addition, by mounting one or more (1 + n) units (13a ... 13n) in a compact module to be operated in parallel or parallel operation, the system of the multiple power supply can be miniaturized and the unit on one side may cause any trouble during operation. In the event of a fault, the other unit replaces the original function of the DC / DC converter without affecting the other unit at all, and the failed unit is easy to replace even during operation for repair. It is composed by adopting plug-in method.

In addition, the DC / DC inverter unit 13 to control the direct and parallel operation, such as the direct and parallel operation control of the rectifier and the charging unit 11 to supply the power stably without staging in preparation for load expansion or failure. For sake.

This series and parallel operation control method is configured to be similarly applied to the DC / AC inverter unit 14 of the present invention.

The DC / AC inverter unit 14 mounts at least one (1 + n) unit 14a ... 14n as a miniaturization module to the AC side where the AC 110V / 220V rated AC voltage is other equipment. It is configured to output to the equipment (30).

The operation function of the DC / AC inverter 14 receives a predetermined DC voltage output from the storage battery 12 under the control of the control unit 15 and converts the predetermined DC voltage into an AC voltage of a predetermined level. It outputs to the AC side equipment, and normally, it bypasses the input commercial AC voltage and supplies it to AC power supply to peripheral operation equipments, such as a base station.

In addition, the DC / AC inverter unit 14 has a small module and is mounted in a hot plug-in manner, so that the unit can be easily replaced in the event of a load change or an expansion of the unit or a change of model. As an example, if an accident occurs during operation, the controller 15 checks whether a failure occurs in the unit so that the failed unit can be turned off and the other unit can be quickly converted to take over the unique function of the inverter. Consists of.

Here, the DC / DC converter 13 has a high frequency conversion method (P.W.M), and the inrush current prevention circuit and the EMI (electro-magnetic interference) filter circuit are built in the converter input terminal.

In addition, the protection function cuts off the output voltage by the self-protection circuit during overvoltage output, the reset function restarted by the ON / OFF switch to eliminate the fault, the overcurrent protection function and the inrush current in case of return after power failure. Soft start function, etc.,

In addition, even if not separately mentioned in the present invention, as shown in FIG. 6, it is obvious in the art that the whole unit includes a protection function similar to the protection function of the DC / DC converter 13, such protection. The function is controlled by the control unit 15 and user key input.

The control unit 15 incorporated in the composite power supply 10 has RS-485 communication ports C11, C13, and C14 capable of bidirectional communication.

Referring to Figure 1 below, RS-485 is a balanced interface specification. Equilibrium means that the round trip of the circuit is completely symmetrical and bidirectional communication is possible. Unbalance means that the round trip of the circuit is not symmetrical, as in the case of RS-232. Communication is only possible and cannot be called symmetric because the signal line is grounded to one side. On the other hand, in the balanced type, neither of the circuit shuttles is grounded, but symmetrical with respect to the ground.

In conclusion, we can say that equilibrium is superior to unbalance. It is also excellent that the power supply is a +5 [V] single power supply. The driver and receiver chip for RS-485 use TI's SN65176.

Differential bus transceivers, such as RS-485, can transmit data up to 4 km without error if the cable is completely shielded.

As described above, in the composite power supply apparatus of the present invention, each unit of the rectifying and charging unit 11 and the storage battery 12, the DC / DC converter unit 13, the DC / AC inverter unit 14, and the like is In order to control at the same time, a controller 15 equipped with RS-485 capable of bidirectional communication was provided.

It detects and processes various data information (voltage, current, control signal, etc.) for each unit, controls ON / OFF, and transmits voltage and current values necessary for operation to provide an optimal operation system. There is a purpose.

Looking at the operation function of the control unit 15 configured as described above, the rectifying and charging unit 11 is connected to the storage battery 12 through the DCCT2 (battery primary side) and the charging current value detected by the DCCT2 is the control unit 15. ), The control unit 15 determines the optimal floating, even charging mode operation,

In addition, by determining the DCCT1 (secondary battery side) current value and the current value of the DCCT2 to determine the optimum rectification and operating capacity of the charging unit 11, and makes the battery to be optimal charging through the control signal (C11) In addition, efficient energy saving operation and parallel operation should be performed.

As shown in the following example, in more detail in terms of parallel operation and energy saving operation of the present invention, in parallel operation at intervals of 15 minutes from the lowest order of the operating unit within the range not exceeding 95% of the capacity of each unit It automatically stops and goes to sleep, and the remaining running units share load current evenly.

In this way, the load current is shared so as to prepare for the case where the load sharing ratio of the operable unit exceeds 95% due to the failure of the unit due to the failure.

In addition, when the load current increases during parallel operation and the output current of the unit increases more than 95%, the rectifiers in the idle state are automatically restarted at 15 second intervals to share the load evenly with other units.

In addition, when a failure occurs in one unit in operation, it is configured to automatically connect to the other unit that can operate.

On the other hand, the units controlled in the energy management operation state must shift the operation of the highest rank unit and the highest idle unit at 24 hours every day to equalize the operating time of all units. If there is a unit, the in-vehicle unit that can operate is automatically shifted.

For example, if the total load current is 500A during 10 parallel operation of 10 units, there are about 6 units of 83A load sharing, and if the unit operated today is from 1 to 6 times, The unit to be operated should be operated from # 2 to # 7. If there is a problem with the # 7 unit, the operation is to # 8. At this time, the voltage of the battery 12 which is optimally charged is supplied to the DC / DC converter unit 13 and the DC / AC inverter unit 14.

The control unit 15 also bidirectionally communicates between the DC / DC converter unit 13 and the DC / AC inverter unit 14 to communicate with each unit 13a ... 13n and DC / AC of the DC / DC converter unit. Efficient energy is determined by comparing the current and voltage values of the units 14a ... 14n of the inverter unit and determining the number of operating units for all units of the DC / DC converter unit 13 and the DC / AC inverter unit 14 Perform administrative operations.

In addition, the controller 15 detects whether an AC input power is out of power and causes the backup power storage battery 12 to transmit a predetermined DC voltage to the DC / DC converter unit 13 and the DC / AC inverter unit 14. Control to automatically output

In particular, in the present invention, the plurality of DC / DC units 13a ... 13n and the plurality of DC / AC units 14a are reduced even when the voltage of the storage battery 12 decreases due to an unbalanced load during the power failure of the AC input. The battery is designed so that ... 14n can be controlled and converted to the rated voltage by the optimum load sharing to supply power to the load side equipment and other operating equipment for a long time.

In addition, in the present invention, in the installation of the battery 12, the conventional output system in which the converter, the rectifier and the battery are separately connected and operated as a two-pack system is installed in one power supply device. It features an integrated composite power supply unit that has been integrated into each unit input side terminal into a compact system.

Here, comparing the characteristics between the conventional power supply and the composite power supply of the present invention is as follows.

Referring to the comparison table, to explain, the conventional power supply device shown in Fig. 1 (a) has the advantage that the rectifier output voltage is always constant in the power failure or normal operating state to always maintain the output of the transceiver Therefore, DC output voltage stability is excellent, maintenance is easy, and battery can be operated in one set with large capacity, but when selecting the UPS capacity, the total load capacity is 100% (power of transmitter and receiver: 70%, power of other operating equipment). : 30%), the UPS must be configured with a large capacity that can supply 100% of the power to the rectifier and other operating equipment, which is impractical due to low power conversion efficiency, and the installation area is large because the UPS and the storage battery are large. In addition, there is a defect that the communication function of the entire base station is paralyzed in case of failure, and is not currently used.

In addition, the power supply device shown in (b) of FIG. 1 includes a UPS and a rectifier as a separate system, and when the UPS capacity is selected, the total load capacity is 100% (transmission and reception power: 70%, other operations). In the case of the power of the device: 30%), the UPS can be calculated with a small capacity and has high power conversion efficiency, but requires two sets of small-capacity batteries, and requires maintenance of two sets of rectifiers, UPS, and storage batteries. The installation area also occupies a large space, and the stability of the DC output also reduces the rectifier side battery voltage after a certain period of time when the AC input is out of power and the output of the transceiver decreases. Since the stability of the DC output is increased due to charging, the output voltage is unstable, so that the service area of the base station is narrowed.

In addition, in order to improve the disadvantage shown in FIG. 1B, the power supply device shown in FIG. 1C is connected to the battery output to maintain a constant DC input voltage of the transceiver even when the battery voltage is reduced. If a booster converter is installed and the total load capacity is 100% (70% power of the transmitter / receiver and 30% power of other operating equipment) when selecting the UPS capacity, the UPS can be calculated with a small capacity. It requires a small capacity storage battery and manages two sets of rectifiers, UPS, booster converter and storage battery, so maintenance is not easy, power conversion efficiency is low, installation area occupies a large space, and DC The stability of the output is a method of compensating the voltage in the booster converter when the voltage of the rectifier side drops after a certain period of time when the AC input is out of power. The pressure is unstable and has an improvement in the stable but stable power supply over the method shown in FIG.

On the other hand, the present invention, while retaining the advantages of the existing power supply as it is to greatly improve the disadvantages to facilitate efficient energy management operation and maintenance, in particular, the installation system and installation cost by compactizing the entire system Each unit is composed of one or more (1 + n) serial / parallel operation circuits so that it can be easily updated without reducing the need for additional equipment.

In addition, the control unit equipped with RSC-485, which enables bidirectional communication between devices, controls each unit at the same time to respond quickly and accurately to power failures, load fluctuations, and failures of each unit, thereby improving the reliability and quality of the power supply. Pursued.

As described above, the composite power supply device of the present invention, unlike the conventional power supply device, the pre- and main power storage battery 12 to the rectifier and charging unit 11 and the DC / DC converter unit 13 and the DC / AC inverter ( 14) between the rectifier and the charging unit 11, the battery 12 is always maintained in the optimum state of charge despite the self-discharge, so that the vortex component is almost zero while passing through the DC / DC converter unit Not only is the DC current rectified near to be supplied smoothly, but also at the time of power failure, the DC / AC inverter unit 14 can supply the optimum DC voltage for a long time. In addition, under the control of the control unit 15, various protection functions significantly reduce the voltage fluctuation rate due to load variation, thereby saving energy and supplying a stable DC voltage.

In addition, although the technical idea of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not for the limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical idea of the present invention.

In addition, the composite power supply of the present invention, in view of the existing power conversion method, AC to DC, DC to DC or DC to AC of any form of about 90% or more of the conventional pulse width modulation (PWM) method Is used, and the control circuit can be configured according to the purpose of use.

As described above, in the present invention, unlike the conventional method in which direct current is supplied by a battery method as a reserve power source when the AC input power is cut off by a power failure or the like, a power supply of an optimally charged battery is always provided. As the power supply, the converter or inverter always converts and supplies the rated voltage so that it can output the rated voltage to the transceiver and other operating equipment more stably for a long time than the conventional one, and more than one (1+) for each unit By adopting n) serial / parallel operation control method, efficient energy management operation is enabled, further improving the high reliability of the system. In addition, by configuring the conventional converter and the storage battery as a one-piece system that is integrated in one of the two-piece system, it is possible to miniaturize the entire device and reduce the manufacturing installation cost.

Claims (7)

In the composite power supply device that receives a predetermined commercial AC voltage input from the outside to control rectification and charge conversion, The power supply device includes a rectifier and a charging unit capable of controlling parallel / parallel operation consisting of one or more (1 + n) units for receiving AC power to rectify DC and output a predetermined charging voltage; Pre- and main power storage battery which is selected by the appropriate quantity according to the facility capacity ratio of the load by receiving the DC voltage output from the rectifier and the charging unit and automatically chargeable for direct and parallel operation control; DC / DC converter unit capable of direct / parallel operation control composed of at least one (1 + n) unit by converting the DC voltage of a predetermined level by receiving the voltage output from the battery and converting the DC voltage to a predetermined level. Wow, In the event of power failure, the voltage output from the battery is applied to convert the AC voltage to a predetermined level and output to the AC-side equipment and equipment. Normally, the commercial AC voltage input is bypassed to allow peripheral operation of the base station. A DC / AC inverter unit capable of parallel / parallel operation control comprising one or more (1 + n) units for supplying AC power to the apparatus, The controller controls the entire system, automatically charges the storage battery, and controls the one or more (1 + n) units to use the hot plug-in method to enable efficient serial / parallel operation. Complex power supply characterized in that configured to include The RS of claim 1, wherein the combined power supply device installs the spare and main power storage batteries between the rectifier and the charging unit, the DC / DC converter unit, and the DC / AC inverter unit to enable bidirectional communication between the control unit and the unit. Multiple power supply characterized in that it further comprises a configuration capable of simultaneous conversion control by -485 According to claim 2, The composite power supply device, when installing a storage battery, the conventional two sets of operating as a backup power supply using a separate storage battery to supply power to the DC / DC converter unit and the DC / AC inverter unit Complex power supply characterized in that the system is further configured by modularizing the system into a single system capable of 1 + n serial and parallel operation control 4. The composite power supply of claim 3, wherein each unit of the composite power supply further includes a self-protection circuit controlled by a control unit and a user key input. The DC / DC converter according to claim 1, wherein the DC / DC converter has at least one (1 + n) DC / DC unit (13a ... 13n) and is capable of direct and parallel operation control. If a fault occurs in one unit due to some fault, the other unit (1 + n) replaces the original function of the converter without affecting the other unit at all. In addition, the unit on the one side of the failure further includes a hot plug-in (Hot Plug-in) method for easy repair even during operation is mounted in the composite power supply characterized in that it further comprises The DC / AC inverter unit includes at least one (1 + n) DC / DC unit (13a ... 13n) and is capable of direct and parallel operation control. If a fault occurs in one unit due to some fault, the other unit (1 + n) replaces the original function of the inverter without affecting the other unit at all. In addition, a hot plug-in type system which bypasses AC power, which is a commercial power supply, and converts and controls an input of a predetermined battery voltage during power outage to output AC 110V / 220V. A composite power supply further comprising a unit structure and mounted in the composite power supply. The method according to claim 1, wherein the unit is configured with 1 + n so as to control the serial / parallel operation according to the load facility capacity of the DC / DC converter unit and the DC / AC inverter unit connected to the output terminal of the battery. One or more (1 + n) series of the rectifier and the charging unit is further connected to cope with load expansion, In addition, when one unit breaks down due to external factors or internal shock voltages, the other side unit controls the parallel operation so that the user can easily replace and repair the broken unit even during operation. Composite power supply device characterized in that configured in the plug-in)