KR20070023955A - Power converting apparatus using the multiple power inputs - Google Patents

Abstract

A power converting apparatus is provided to stably supply a source voltage to an electronic device, when one of DC voltage sources is defective, by using plural voltage sources. A first inverter(101) receives a first DC voltage and outputs a first AC voltage. A second inverter(111) receives a second DC voltage and outputs a second AC voltage which is equal to the first AC voltage. A second switch unit(113) synchronously outputs one of the external AC voltage and the second AC voltage. A first switch unit(103) synchronously outputs one of the first AC voltage and the AC voltage which is outputted from the second switch unit. A controller(120) controls the first and second inverters. When the first AC voltage is defective, the controller controls the first switch unit to output the AC voltage from the second switch unit. When the first and second AC voltages are defective, the controller controls the first and second switch units to output the external AC voltage.

Description

Power converting apparatus using the multiple power inputs}

1 is a block diagram of a multiple power supply power converter according to the present invention;

2 is a block diagram of a multi-supply power converter according to another embodiment of the present invention, and

3 is a flowchart provided to explain the operation of the multiple power supply power converter of the present invention.

The present invention relates to a power conversion device, and more particularly, at least two battery power inputs and outputs one AC power supply to the system for AC power supply, if one DC power problem is replaced by another power supply The present invention relates to a power converter using multiple power sources capable of stably supplying AC power despite battery power abnormalities.

For communication systems and various computer systems, stable supply of power is essential. These systems are largely divided into the case of receiving AC power and converting itself into DC power, and the case of receiving DC power from the beginning.

In the case of using an AC power source, a system is usually operated by using a power converter called an inverter.

The power converter is a reverse converter that converts DC power into AC power. It is a stationary constant voltage and constant frequency power supply that supplies power to communication equipment by converting DC power such as battery power into AC power and outputting stabilized AC 220V power. To supply.

The power converter is usually a transformer for amplifying a DC power supply, a DC-DC converter circuit for switching a DC power supply on a primary side of the transformer with a predetermined pulse, and induced on the secondary side of the transformer. It consists of a DC-AC inverter circuit for converting pulse power to commercial AC power.

The elements constituting the inverter of the power converter include field effect transistors (FETs), power transistors, and insulated gate bipolar transistors (IGBTs). Pulse Width Modulation (PWM) and Pulse Amplitude Modulation (PAM) are available.

The DC power supply used by the power converter usually uses a large capacity battery. The output of the power converter is input to the AC equipment and used as it is, or input to the system having its own power supply is converted to DC power to be used again.

In a common case, even when a commercial AC power source is used simultaneously with the power converter, a failure of the power converter, a defective battery, and a momentary power failure of the commercial AC power source can not be effectively dealt with. Such prolonged failures or momentary power outages can have catastrophic consequences for the operation of the system and can lead to significant economic losses. Therefore, there is a need for a power converter that can supply power more stably.

Accordingly, an object of the present invention is to have a backup structure using a multi-inverter structure corresponding to multiple DC power input as well as commercial AC power supply, which is stable in spite of emergency situations such as battery failure, instantaneous power failure of commercial power supply, and system failure. An object of the present invention is to provide a multi-power power converter capable of supplying AC power.

In order to achieve the above object, the multi-power power converter according to the present invention includes a first inverter unit for receiving a first DC power of a predetermined size and outputting a first AC power of a predetermined standard, and And a second inverter unit receiving a DC power and outputting a second AC power having the same standard as that of the first AC power.

In addition, a first switch for outputting any one of the second switch unit for outputting any one of the AC power input from the outside and the second AC power, the AC power output from the first AC power and the second switch unit. And a control unit controlling an inverting operation of the first and second inverter units.

The control unit controls the first switch unit to output the AC power output from the second switch unit when the first AC power is abnormal, and the external when the first and second AC power is abnormal. The first and second switch unit is controlled to output an AC power input from the.

Preferably, the display apparatus may further include an alarm display unit configured to display an alarm corresponding to the alarm signal from the controller, wherein the controller corresponds to a case in which one of the first AC power source and the second AC power source is abnormal. An alarm signal is output to the alarm display unit.

The method may further include a third switch outputting any one of the input and bypassed commercial AC power and the AC power output from the first switch unit to bypass and output the commercial AC power.

Here, the first AC power of the predetermined standard and the AC power input from the outside are any one of about 110V and about 220V of commercially available 60 kW or 380V of three phases.

The multiple power supply power converter according to another embodiment of the present invention includes at least two power conversion circuits. Each power conversion circuit unit is an inverter unit for receiving a DC power of a predetermined size and outputting an AC power of a predetermined standard, a switch for outputting any one of an AC power output from the inverter unit and an AC power input from the outside. And a control unit controlling the inverting operation of the inverter unit and controlling the switch unit to output the external AC power when there is an error in the AC power output from the inverter unit.

The AC output of any one of the power conversion circuit units is connected in cascade to be input to an external AC power source of the other circuit unit.

In addition, each of the power conversion circuit unit is formed so as to be mounted and detached, and can be separated during the entire operation, thereby making it easy to repair.

The invention can be implemented with methods, apparatus and systems. Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is a block diagram of a multiple power supply power converter according to the present invention.

The power converter 100 of the present invention is a device for stably supplying power of various systems using AC power, and receives at least two DC powers and converts them into AC powers to output them.

The power converter 100 includes an inverter circuit corresponding to the number of DC power inputs, and by using one of the DC power inputs as the main power, the AC power is stably backed up to the remaining power when the main power is not good. Keep the output. In addition, in case that all the DC power supply is bad or the corresponding inverter circuit is bad, the power converter may bypass the commercial AC power and output the same.

1 illustrates a case where a triple power source including two DC power sources, a first and a second DC power source and a commercial AC power source, is input for convenience of description. However, the power converter of the present invention is not limited thereto, and more DC power sources may be used.

Referring to FIG. 1, the power converter 100 of the present invention includes a first inverter unit 101, a first switch unit 103, a second inverter unit 111, a second switch unit 113, and a controller ( 120, a third switch 130, and an alarm display unit 140, and receives AC power together with first and second DC powers to output AC power.

The first DC power supply and the second DC power supply may use a battery that normally outputs a DC of 48V. Preferably, the first DC power source and the second DC power source may be supplied from a rectifier that receives commercial AC power and outputs DC power. In this case, the rectifier can charge an internal or external battery and output battery power instead of rectifying commercial AC power.

A commercial AC power supply is a normal commercial 60 kV, and a single-phase 110 V or 220 V power supply or a three-phase 380 V power supply is preferable. In addition, it is preferable that the final output AC power has the same specifications and shapes as the commercial AC power.

The first inverter unit 101 receives the first DC power, converts it into a first AC power, and outputs the same to the first switch unit 103. The first inverter unit 101 outputs a pulse width modulation (PWM) or the like from the controller 120. Controlled by Pulse Amplitude Modulation (PAM).

The first AC power output from the first inverter unit 101 may be determined according to the load supplied with the final AC power output in the power converter 100 of the present invention. Preferably, about 60 kW is commercially available, and a single phase about 110V or about 220V power supply or a three phase 380V power supply is preferred.

The first inverter unit 101 may include a DC-DC converter (not shown), a transformer (not shown) and a DC-AC inverter (not shown), and a dual DC-AC inverter (not shown) This may correspond to a field effect transistor (FET), a power transistor and an insulated gate bipolar transistor (IGBT).

The first switch unit 103 receives the first AC power output from the first inverter unit 101 and the second AC power output from the second switch unit 113, respectively, under the control of the controller 120. Only the AC power of the output to the third switch 130. In switching the output by switching, the first switch unit 103 preferably outputs a synchronous transfer.

Synchronous switching is a case where the switching semiconductor and the load are avoided by outputting a power supply which is not broken in synchronization with each other when switching power supply. The first switch unit 103 may correspond to a relay or a power transistor.

The second inverter unit 111 receives the second DC power and converts it into a second AC power and outputs it to the second switch unit 113. The second inverter unit 111 may correspond to the first inverter unit 101 and have the same structure. The second AC power source has the same specification and shape as the first AC power source.

The second switch unit 113 receives the second AC power source and the commercial AC power output from the second inverter unit 111 and controls only one AC power source to the first switch unit 103 under the control of the control unit 120. Output According to another embodiment of the present invention, the AC power output of the conventional general power converter and the power converter of the present invention may be input instead of a commercial AC power source.

The control unit 120 controls the overall operation of the power converter of the present invention. The controller 120 outputs a control signal to the first and second inverter units 101 and 111 to control the DC-AC inverting operation.

The control unit 120 controls the first and second switch units 103 and 113 in order of priority in the order of the second DC power source and the commercial AC power source, using the first DC power source as the main power source, and replaces them in various emergency situations. Allow synchronous transfer to power.

In an emergency situation, first, the first DC power input is defective or the first inverter unit 101 malfunctions. When the DC power source mainly uses a battery, the battery power falls below a predetermined voltage, and the malfunction of the first inverter unit 101 may not properly output AC power due to an inverting operation due to various causes. Corresponds to this. In this case, the control unit 120 controls the first switch unit 103 so that the input from the second switch unit 113 is output, thereby replacing the second DC power source.

Second, the second DC power input is bad or the second inverter 111 malfunctions. In this case, the control unit 120 controls the second switch unit 113 to output the commercial AC power input to the first switch unit 103. However, the controller 120 controls the first and second switch units 103 and 113 to finally output the commercial AC power to the third switch 130 only when an abnormality occurs in both the first and second DC power sources.

The controller 120 controls the second AC power to always be output to the first switch unit 103 through the second switch unit 113 even if the second AC power source by the second DC power source is not used.

The control unit 120 generates an alarm signal corresponding to the situation when the first DC power source and the second DC power source are poor or the first inverter unit 101 and the second inverter unit 111 malfunction. To the alarm display unit 140 to be displayed to the user.

The alarm display unit 140 outputs an alarm corresponding to the alarm signal from the control unit 120 to the user. The alarm display unit 140 includes a speaker, a buzzer, a light emitting diode (LED), a lamp, and a printer, as well as a liquid crystal display (LCD). Various display devices, including) may correspond.

The third switch 130 finally outputs one of the first switch unit 103 and the input and bypassed commercial AC power to a load (not shown), and is generally referred to as a "bypass switch". The third switch 130 may be controlled by a separate control circuit (not shown), and may also be operated by a user's physical manipulation.

The third switch 130 is used for bypassing the commercial AC power before being input to the second switch unit 113 and finally outputting the same, and outputting the AC power under the control of the control unit 120. If this is impossible, it is used as a last resort.

In general, the user checks the alarm displayed by the control unit 120 through the alarm display unit 140 and confirms that the operation of the power converter 100 is not normal. If the emergency situation is caused by a circuit including the first and second inverter units 101 and 111 and the first and second switch units 103 and 113 inside the DC power supply itself, the third switch ( 130 may be controlled to output the input commercial AC power, and then the system may be repaired and maintained.

2 is a block diagram of a multiple power supply power converter according to another embodiment of the present invention.

The power converter 200 of FIG. 2 separately controls each DC power input and a corresponding inverter unit in place of the controller 120 of FIG. 1. Accordingly, the power conversion apparatus 200 may be detachably attached to the power conversion apparatus 200 by separately configuring and separating the power conversion circuit unit according to each DC power input. Accordingly, the power converter 200 can increase the stability of the system, and can be easily repaired and maintained by separating only a corresponding part when a circuit corresponding to the input of the second DC power supply fails.

Referring to FIG. 2, the power converter 200 according to another embodiment of the present invention may include a first inverter unit 211, a first switch unit 213, a first control unit 215, and a second inverter unit ( 221, a second switch unit 223, a second control unit 215, a third switch 230, and an alarm display unit 240, and receive commercial AC power together with the first and second DC power sources. Output one AC power supply.

The first DC power source, the second DC power source, the commercial AC power input and the final AC power input of FIG. 2 are connected to the first DC power source, the second DC power source, the commercial AC power input and the final output AC power source of FIG. Corresponds and is the same.

The first power conversion circuit unit 210 includes a first inverter unit 211, a first switch unit 213, and a first control unit 215, and the second power conversion circuit unit 220 includes a second inverter unit 221. ), A second switch unit 223, and a second control unit 215.

The first inverter unit 211, the first switch unit 213, the second inverter unit 221, and the second switch unit 223 are the first inverter unit 101 and the first switch unit 103 of FIG. 1. It corresponds to the second inverter section 111, the second switch section 113, and operates in the same way. However, these are not controlled by one control unit, the first inverter unit 211 and the first switch unit 213 are controlled by the first control unit 215, and the second inverter unit 221 and the second switch. The unit 223 is controlled by the second control unit 225, respectively.

The third switch 230 corresponds to the third switch 130 of FIG. 1 and operates in the same manner. In this case, the third switch 230 is controlled by a user's operation to finally output only one AC power supply to a load (not shown), and is generally referred to as a "bypass switch".

The alarm display unit 240 corresponds to the alarm display unit 140 of FIG. 1. However, while being controlled by the first and second controllers 215 and 225, respectively, an alarm corresponding to each controller may be separately displayed or only one situation represented as the entire alarm may be displayed.

The first control unit 215 controls the first inverter unit 211 to output the first AC power, and the first control unit 213 controls the first switch unit 213 to output one AC power to the third switch 230. Be sure to In addition, an alarm signal corresponding to a poor input of the first DC power supply or a malfunction of the first inverter unit 211 and the first switch unit 213 is output to the alarm display unit 240.

The second controller 225 controls the second inverter unit 221 to output the second AC power, and controls the second switch unit 223 to output one AC power to the first switch unit 213. Be sure to In addition, an alarm signal corresponding to a poor input of the second DC power supply or a malfunction of the second inverter unit 221 and the second switch unit 223 is output to the alarm display unit 240.

Accordingly, when there is an error in the circuit controlled by the second control unit 225, the second control unit 225 notifies the user through the alarm display unit 240, and the user converts only the second power conversion circuit unit 220 into power. It can be repaired separately from the device 200.

As briefly mentioned above, the power converter 100, 200 of the present invention, in addition to operating alone, two or more power converters 100, 200 are connected by a cascade, or a conventional power It can be cascaded with inverter to ensure the stability of output power. In this case, the final AC output of one power converter is input to the commercial AC power source of the other power converter.

3 is a flowchart provided to explain the operation of the multiple power supply power converter of the present invention. Hereinafter, an operation of the power converter of the present invention will be described with reference to FIGS. 1 to 3. For convenience of explanation, the description will be mainly based on the power converter 100 of FIG. 1.

While controlling the operation of the system, the control unit 120 determines whether the first DC power input is bad and whether the first inverter unit 101 malfunctions (S301).

If the first DC power supply is defective or there is an error in the operation of the first inverter unit 101, the corresponding alarm signal is output to the alarm display unit 140, and the alarm display unit 140 outputs a corresponding alarm. To display. In addition, the control unit 120 determines whether the second DC power input is normal or whether there is no abnormality in the operation of the second inverter unit 111 (S303).

As a result of the determination, if the operation of the second DC power source and the second inverter unit 111 is normal and the second AC power is properly output, the control unit 120 determines the first switch unit 103 and the second switch unit 113. By controlling the synchronous transfer so that the second AC power by the second DC power is output to the third switch (130) (S305).

As a result of the determination in step S303, if there is an error in the operation of the second DC power supply and the second inverter unit 111, an alarm signal corresponding thereto is output to the alarm display unit 140, and the alarm display unit 140 responds to the corresponding alarm. To be displayed. In addition, the controller 120 controls the first and second switch units 103 and 113 to output the commercial AC power input to the third switch 130 (S307).

By the above method, the multiple power supply power converter of the present invention operates.

Although not shown in the method of FIG. 3, when there is an abnormality of the control unit 120, the first switch unit 103, and the second switch unit 113, the user operates the third switch 130 to perform commercial alternating current. After the power is bypassed and output as it is, you can repair the problem.

Although the above has been shown and described with respect to the preferred embodiments of the present invention, the present invention is not limited to the above-described specific embodiments, the present invention without departing from the spirit of the invention claimed in the claims Various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

As described above, the power converter according to the present invention can stably supply power even when an abnormality occurs in one DC power input by supplying AC power of the system using a plurality of DC power supplies.

In addition, the power converter can stably output AC power by coping with a case where all input DC power is poor by using a general commercial AC power as a substitute power.

In addition, by separately configuring the circuit for each input DC power source to be mounted and detachable, it is possible to repair the corresponding part without stopping the operation of the entire power converter in case of abnormal circuit.

The cascade of multiple power converters can be extended without limitation, thereby maximizing the utility as a conventional power supply and making the AC power supply more stable.

Claims (9)

A first inverter unit receiving a first DC power of a predetermined size and outputting a first AC power of a predetermined standard; A second inverter unit receiving a second DC power having a predetermined size and outputting a second AC power having the same standard as the first AC power; A second switch unit for synchronously transferring any one of the AC power input from the outside and the second AC power; A first switch unit for synchronously switching and outputting any one of the AC power output from the first AC power source and the second switch unit; And Controls the inverting operation of the first and second inverter units, and controls the first switch unit to output the AC power output from the second switch unit when there is an error in the first AC power source. And a controller configured to control the first and second switch units to output the AC power input from the outside when there is an error in a second AC power source. The method of claim 1, An alarm display unit displaying an alarm corresponding to an alarm signal from the control unit; And the control unit outputs an alarm signal corresponding to a case where any one of the first AC power source and the second AC power source is abnormal to the alarm display unit. The method of claim 1, And a third switch for outputting any one of the input and bypassed commercial AC power and AC power output from the first switch unit. Multiple power supply converter characterized in that to maintain. The method of claim 1, The first AC power of the predetermined standard, the AC power input from the outside and the AC power output from the first switch unit is about 60 kW, one of about 110V and about 220V or three-phase 380V Multiple power power converter. Outputs any one of an AC power of a predetermined standard and an external AC power input from the outside, which receives and converts a DC power of a predetermined size, and outputs the external AC power when there is an error in the converted AC power. And at least two power conversion circuits. The alternating current output of any one of the power conversion circuit unit is connected to a cascade (cascade) to be input to the external AC power of the other circuit portion. The method of claim 5, The power conversion circuit unit, An inverter unit receiving the DC power and outputting an AC power having the predetermined standard; A switch unit outputting any one of an AC power output from the inverter unit and the external AC power source; And And a control unit controlling the inverting operation of the inverter unit and controlling the switch unit to output the external AC power when there is an error in the AC power output from the inverter unit. . The method of claim 5, Each of the power conversion circuit unit is formed so as to be mounted and detached, multiple power supply power conversion device, characterized in that the removable structure for repair during the entire operation. The method of claim 5, The external AC power input to the power conversion circuit unit connected to the last of the cascade connection is about 60 kW, one of about 110V and about 220V single phase, or three-phase 380V three-phase power converter. The method of claim 8, And a bypass switch configured to be operable to output any one of an input in which the external AC power input to the last connected power conversion circuit unit is bypassed and an AC power output last in front of the cascade connection. Multi-power power converter characterized in that.

Images