KR20160117675A - H-bridge multi-level inverter - Google Patents

H-bridge multi-level inverter Download PDF

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Publication number
KR20160117675A
KR20160117675A KR1020150044203A KR20150044203A KR20160117675A KR 20160117675 A KR20160117675 A KR 20160117675A KR 1020150044203 A KR1020150044203 A KR 1020150044203A KR 20150044203 A KR20150044203 A KR 20150044203A KR 20160117675 A KR20160117675 A KR 20160117675A
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South Korea
Prior art keywords
capacitor
bridge inverter
bridge
inverter
terminal
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KR1020150044203A
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Korean (ko)
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KR101697855B1 (en
Inventor
아흐무드 아쉬라프
박종후
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숭실대학교산학협력단
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Priority to KR1020150044203A priority Critical patent/KR101697855B1/en
Priority to PCT/KR2016/001934 priority patent/WO2016159517A1/en
Publication of KR20160117675A publication Critical patent/KR20160117675A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/49—Combination of the output voltage waveforms of a plurality of converters

Abstract

The present invention relates to an H-bridge multi-level inverter. According to the present invention, the H-bridge multi-level inverter comprises: a first capacitor to remove ripple of a first direct current power source connected to both ends of an input power source and supplied from the input power source; a first H-bridge inverter in which two direct current ends are connected to both ends of the first capacitor and in which a first alternating current end is connected to a first end of a load; a second H-bridge inverter in which a first alternating current end is serially connected to a second alternating current end of the first H-bridge inverter and in which a second direct current power source is formed between the two direct current ends; a second capacitor in which both ends are connected to two direct current ends of the second H-bridge inverter, respectively and which removes the ripple of the second direct current power source; a voltage converter in which an input end is connected to both ends of the second capacitor and which outputs the second direct current power source to the output end by dropping the second direct current power source to third direct current power source, a third capacitor in which both ends are connected to an output end of the voltage converter and which removes the ripple of the third direct current power source; and a third H-bridge inverter in which two direct current ends are connected to both end of the third capacitor, in which a first alternating current end is serially connected to the second alternating current end of the second H-bridge inverter, and in which the second alternating current end is connected to a second end of the load. The H-bridge multi level inverter can generate the alternating current output of the multi-level having high efficiency from a single input power source, can reduce the power throughput of an auxiliary H-bridge inverter connected to a main H-bridge inverter, can reduce costs and a volume, and can improve the efficiency and reliability of the system.

Description

H-bridge multi-level inverter < RTI ID = 0.0 >

The present invention relates to an H-bridge multi-level inverter, and more particularly, to an H-bridge multilevel inverter capable of generating a multi-level AC output voltage.

A multilevel inverter can have multiple levels of output voltage to achieve an output voltage close to a sine wave. Such multilevel inverters can increase the number of voltage levels, thereby reducing the total harmonic distortion (THD) and reducing the loss of the switch, resulting in a high efficiency output voltage.

In general, multilevel inverters are divided into diode-clamp, flying-capacitors, and H-bridge multilevel inverters. Among them, the H-bridge multi-level inverter has a structure in which a plurality of H-bridge inverters are connected in series, and a clamping diode and a plurality of capacitors are unnecessary, and grouping is possible in units of H-bridges, .

However, such an H-bridge multilevel inverter requires a plurality of power supplies corresponding to the number of H-bridges. In order to solve this problem, there is a method of supplying power from the single power supply source to the H-bridge of each stage via a power conversion device such as a transformer, but in this case, the power to be processed by the power conversion device and the H- .

The technology of the background of the present invention is disclosed in Korean Patent No. 1230862 (published on Mar. 02, 2013).

The present invention provides an H-bridge multilevel inverter capable of generating multi-level AC output with high efficiency from a single input power supply and reducing the power throughput of the auxiliary H-bridge inverter connected to the main H-bridge inverter There is a purpose.

The present invention provides a power supply circuit comprising a first capacitor connected to first and second ends of an input power source, the first and second ends being respectively connected to a first capacitor and a second capacitor, Bridge inverter in which a DC terminal is connected to the first and second ends of the first capacitor respectively and a first alternating-current terminal is connected to a first end of the load, and a first alternating-current terminal is connected to the first H- Bridge inverter in series with a second alternating-current terminal of the second H-bridge inverter and having a second direct-current power supply formed between the first and second direct-current ends, and a second H- And a second capacitor connected to the second direct current terminal and removing ripple of the second direct current power supply; first and second input terminals respectively connected to the first and second terminals of the second capacitor; A voltage converter for down-converting the two direct-current power sources to a third direct-current power source and outputting the same between the first and second output terminals, A third capacitor connected to the first and second output terminals of the voltage converter, respectively, for removing ripple of the third DC power supply, and first and second DC stages connected to the first and second ends of the third capacitor, Bridge inverter including a first H-bridge inverter, a second H-bridge inverter, and a second H-bridge inverter, each of which is connected in series with a second AC terminal of the second H-bridge inverter and a second AC terminal is connected to a second terminal of the load, Provides multi-level inverter.

Here, the voltage converter may be a transformer type insulated converter or a buck converter.

The voltage converter may include a first switch having a first end connected to a first end thereof and a second end connected to the first end of the second capacitor, and a second switch connected to the first end of the second capacitor, A second diode connected to the second end of the second switch, a second diode connected to the second end of the second capacitor, an anode connected to the third end of the first switch, a second diode connected to the second end of the second switch, A third diode connected to the anode of the second diode and having a cathode connected to the cathode of the first diode, and a third diode connected to the cathode of the first diode and having a second end connected to the anode of the third capacitor And a second inductor having a first end connected to the anode of the second diode and a second end connected to the second end of the third capacitor.

Also, the first H-bridge inverter may output an AC voltage having the same switching frequency as the operation frequency of the load.

According to the H-bridge multi-level inverter according to the present invention, it is possible to generate multi-level AC output with high efficiency from a single input power supply and to reduce the power throughput of the auxiliary H-bridge inverter connected to the main H- Thereby reducing the price and volume and improving the efficiency and reliability of the system.

1 is a block diagram of an H-bridge multilevel inverter according to an embodiment of the present invention.
2 is a block diagram showing the voltage converter of FIG. 1 in detail.
FIG. 3 is a diagram showing individual DC voltages input to the plurality of H-bridge inverters shown in FIG. 1; FIG.
FIG. 4 is a diagram showing individual AC voltages output from the plurality of H-bridge inverters shown in FIG. 1. FIG.
FIG. 5 is a diagram showing a final output waveform formed by superimposing three waveforms shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention.

1 is a block diagram of an H-bridge multilevel inverter according to an embodiment of the present invention. The H-bridge multilevel inverter 100 according to the embodiment of the present invention includes a first capacitor 120, a first H-bridge inverter 130, a second H-bridge inverter 140, a second capacitor 150, A voltage converter 160, a third capacitor 170, and a third H-bridge inverter 180.

The first capacitor 120 is connected to the first and second ends of the input power supply 110 and the first and second ends of the first and second capacitors 120 and 120 remove the ripple of the first DC power supply Vs supplied from the input power supply 110 And smoothen it. At this time, the voltage (V Aux1 ) applied between both ends of the first capacitor 120 is equal to the magnitude of the first DC power supply.

The first H-bridge inverter 130 has first and second direct-current ends connected to first and second ends of the first capacitor 120, respectively. The first H-bridge inverter 130 converts the first DC power (V Main ) input to the first and second DC stages into AC power using the operation of the internal switches, and outputs the AC power between the first and second AC terminals . Since the structure of the H-bridge inverter composed of a plurality of switches is well known, a detailed description of its operation principle will be omitted.

The first H-bridge inverter (130) and the second H-bridge inverter (140) are connected in series with each other. The first H-bridge inverter 130 has a first AC terminal connected to the first end of the load 10 and a second AC terminal connected in series to the first AC terminal of the second H-bridge inverter 140. The structure of connecting the AC outputs of the plurality of H-bridge inverters in series is known, and the AC output voltage having a plurality of levels can be provided to the load 10 through this structure.

The first H-bridge inverter 130 corresponds to the H-bridge that is main in the multilevel inverter 100. The AC voltage output from the first H-bridge inverter 130 corresponds to the operating frequency of the load 10 Lt; / RTI >

Generally, the operating frequency of the AC load 10 is 60 Hz. Since the first H-bridge inverter 130 needs to be implemented so as to output an AC voltage of 60 Hz, high-speed switching is not required, and accordingly switching loss is low.

Of course, the auxiliary H-bridge inverters at the next stage of the first H-bridge inverter 130, i.e., the second and third H-bridge inverters 180, Speed switching (ex, 10 to 20 kHz). Here, the switching frequency of the AC voltage output between the first and third H-bridge inverters 130, 140, and 180 increases between the first and second H-bridge inverters 130, 140 and 180, respectively.

The second H-bridge inverter 140 has a first AC terminal connected in series with the second AC terminal of the first H-bridge inverter 130 and a second AC terminal connected in series with the first AC terminal of the third H- And a second DC power supply (V Aux1 ) is formed between the first and second DC stages. The voltage of the second DC power supply (V Aux1 ) is smoothed by the second capacitor (150).

The second capacitor 150 is connected to the first and second DC stages of the second H-bridge inverter 140 at the first and second ends to remove the ripple of the second DC power supply V Aux1 , To the voltage converter 160 of FIG. The voltage converter 160 may be implemented as a DC-DC converter.

The voltage converter 160 has first and second input ends connected to the first and second ends of the second capacitor 150 and a second DC power source V Aux1 connected to both ends of the second capacitor 150, Down to the third DC power supply (V Aux2 ) and outputs it between the first and second output terminals.

The voltage converter 160 serves as an auxiliary power source for supplying a DC voltage to the third H-bridge inverter 180. The voltage converter 160 may include a conventional transformer type insulated converter or a buck converter capable of reducing the voltage, a modified insulated buck converter, and the like. The configuration of the modified buck converter is a non-transformer isolated buck converter including at least two inductors, the configuration of which will be described in detail later.

The third capacitor 170 has its first and second ends connected to the first and second output terminals of the voltage converter 160 and is connected to the ripple of the third DC power source V Aux2 output from the voltage converter 160. [ .

The third H-bridge inverter 180 has first and second direct-current ends connected to the first and second ends of the third capacitor 170, respectively. The third H-bridge inverter 180 converts the third DC power source (V Aux2 ) input to the first and second DC stages into the AC power using the operation of the internal switches, and outputs the AC power between the first and second AC terminals .

The third H-bridge inverter 180 has a first AC terminal connected in series with a second AC terminal of the second H-bridge inverter 140, and a second AC terminal connected to the second terminal of the load 10. Accordingly, a multilevel alternating-current voltage waveform is output between the first alternating-current terminal of the first H-bridge inverter 130 and the second alternating-current terminal of the third H-bridge inverter 190, and this alternating- 10 as alternating current power.

1, an asymmetric voltage Vmain, Vaux1, and Vaux2 is generated at each stage, and an AC output having a stepwise voltage waveform is generated by synthesizing the asymmetric voltages Vmain, Vaux1, and Vaux2 through the H- . The asymmetric voltage generally has a multiple form of each other.

1, the first H-bridge inverter 130 is configured to output an AC voltage having the same switching frequency as the operating frequency (ex, 60 Hz) of the load 10, and the second H- And the third H-bridge inverter 180 perform high-speed switching to output a high-frequency AC voltage. Of course, the AC voltage output from the third H-bridge inverter 180 has a frequency higher than that of the second H-bridge inverter 140. In the embodiment of the present invention, as these three output waveforms are superimposed and output, AC power having a multi-level level can be supplied to the load 10.

In the embodiment of the present invention, the AC output finally output through a plurality of H-bridge inverters is a concept including an alternating current output for motor control or a grid-connected renewable energy generation power. In the embodiment of the present invention as described above, the plurality of H-bridge inverters have a structure in which the AC stages are connected in series, and the unit of the H-bridge inverter used is a basic configuration of three stages as shown in FIG.

The overall power flow in the multi-level inverter according to the embodiment of the present invention as shown in FIG. 1 can be found by referring to arrows. The embodiment of the present invention is characterized in that a power flow is applied to the first H-bridge inverter 130, the second H-bridge inverter 140, the voltage converter 160, the third H-bridge inverter 180 ). ≪ / RTI >

In the conventional multi-level inverter, if the auxiliary power is supplied to the auxiliary H-bridge inverter by directly receiving the voltage from the single input power (main power), the embodiment of the present invention controls the power supplied from the input power to the first H- That is, the voltage converter 160, via the second H-bridge inverter 140 at the intermediate stage through the second H-bridge inverter 130 at the intermediate stage.

1, since the H-bridge inverter 140 at the middle stage among the two H-bridge inverters 140 and 180 used as auxiliary supplies power to the former stage of the voltage converter 160 corresponding to the auxiliary power source , The power throughput of the auxiliary H-bridge inverter connected to the main H-bridge inverter can be reduced.

In this structure, the first H-bridge inverter 130 can produce about 90% of the total AC output power supplied to the load 10 and the remaining second and third H-bridge inverters 180 generate 5 % Of power can be produced. In other words, most of the power supplied to the load 10 can be produced through the first H-bridge inverter 130.

2 is a block diagram showing the voltage converter of FIG. 1 in detail. The voltage converter 160 shown in Fig. 2 has a modified buck converter configuration. Its basic operation is the same as that of a conventional buck converter.

Hereinafter, the voltage converter 160 includes a first switch S1, a second switch S2, a first diode D1, a second diode D2, a third diode D3, a first inductor L1, And a second inductor L2.

The first voltage converter 160 has a shape similar to that of a conventional buck converter. The conventional buck converter has no isolation function, but the voltage converter according to the present embodiment includes an inductor on the ground line and has an isolation function . The voltage converter can also be configured as a bi-directional switch.

The first switch S1 is formed of a transistor or the like and is supplied with a control signal at a first terminal (gate terminal), a second terminal connected to a first terminal of the second capacitor 150, And is connected to the anode of the diode D1.

The second switch S2 is formed of a transistor or the like, and a control signal is applied to the first terminal (gate terminal), a third terminal connected to the second terminal of the second capacitor 110, And is connected to the cathode of the diode D2.

The first diode D1 has an anode connected to the third end of the first switch S1 and a cathode connected to the first end of the first inductor L1. The second diode D2 has a cathode connected to the second end of the second switch S2 and an anode connected to the first end of the second inductor L2. And the third diode D3 has its anode connected to the anode of the second diode D2 and its cathode connected to the cathode of the first diode D1.

The first inductor L1 has a first end connected to the cathode of the first diode D1 and a second end connected to the first end of the second capacitor 150. [ The second inductor L2 has a first end connected to the anode of the second diode D2 and a second end connected to the second end of the second capacitor 150. [ The second inductor L2 separates the ground of the third H-bridge inverter 180 from the ground of the input power source 110 to secure insulation.

In this structure, when each switch is turned on, the first switch S1, the first diode D1, the first inductor L1, the third capacitor 170, the second inductor L2, -> the second diode (D2) -> the second switch (S2). The first diode D1 is turned on by the third diode D3 while the second diode D1 is turned on and the second diode D1 is turned on. A current flow occurs in the inductor L1 direction. The voltage converter may be meant to include a capacitor.

When the switch is turned on, the inductor current increases and when the switch is turned off, the inductor current decreases until the switch is turned on again. When the switch is periodically turned on and off, the voltage is smoothed by L and C and output as a DC voltage. . This principle is almost the same as the operation mode of the conventional buck converter, so a detailed description will be omitted.

Hereinafter, simulation results of the performance of the multi-level inverter according to the embodiment of the present invention will be described. In the simulation, the input power source 110 uses Vs = 225V.

FIG. 3 is a diagram showing individual DC voltages input to the plurality of H-bridge inverters shown in FIG. 1; FIG. 3 shows an example using three times asymmetric voltage.

3, the DC power source Vmain_DC input to the first H-bridge inverter 130 is 225 V, which is the same as the input power source 110, the DC power source Vaux1_DC input to the second H-bridge inverter 140, And the DC power source Vaux2_DC input to the third H-bridge inverter 180 is observed at 25V which is 1/3 of Vaux1_DC.

FIG. 4 is a diagram showing individual AC voltages output from the plurality of H-bridge inverters shown in FIG. 1. FIG. The AC outputs of the first to third H-bridge inverters 130, 140, and 180 are denoted as Vmain_AC, Vaux1_AC, and Vaux2_AC, respectively. The AC outputs Vaux1_AC and Vaux2_AC of the second and third H-bridge inverters 140 and 180 have higher frequency characteristics than those of the first and second H-bridge inverters 130 and 180, respectively, if the AC output Vmain_AC of the first H- . ≪ / RTI > Of course, it can be seen that the frequency of the AC voltage output to the first to third H-bridge inverters 130, 140 and 180 increases.

FIG. 5 is a diagram showing a final output waveform formed by superimposing three waveforms shown in FIG. The final output waveform of Fig. 5 is a waveform actually applied to the load, and can output an AC voltage form having 21 levels in total through the circuit configuration of Fig. And the final output frequency has a 60 Hz component that is equal to the operating frequency of the load.

According to the H-bridge multi-level inverter according to the present invention, a multi-level AC output having a high efficiency can be generated from a single input power source, and the power throughput of the auxiliary H-bridge inverter connected to the main H- The cost and volume can be reduced, and the efficiency and reliability of the system can be improved.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Multi-level inverter 110: Input power
120: first capacitor 130: first H-bridge inverter
140: second H-bridge inverter 150: second capacitor
160: voltage converter 170: third capacitor
180: Third H-bridge inverter

Claims (4)

A first capacitor connected to the first and second ends of the input power source, respectively, for removing ripples of the first DC power supplied from the input power source;
A first H-bridge inverter in which first and second dc ends are connected to first and second ends of the first capacitor, respectively, and a first alternating current end is connected to a first end of the load;
A second H-bridge inverter in which a first AC terminal is serially connected to a second AC terminal of the first H-bridge inverter, and a second DC power is formed between the first and second DC terminals;
A second capacitor connected to the first and second ends of the second H-bridge inverter, respectively, and for removing ripple of the second DC power supply;
A voltage converter connected to the first and second ends of the second capacitor, respectively, the first and second input terminals being respectively connected to the first and second output terminals;
A third capacitor connected to the first and second output terminals of the voltage converter, respectively, and removing ripple of the third DC power supply; And
Wherein the first AC terminal is connected to the first and second ends of the third capacitor, the first AC terminal is connected in series with the second AC terminal of the second H-bridge inverter, and the second AC terminal is connected to the load And a third H-bridge inverter coupled to the second end of the H-bridge inverter. The method according to claim 1,
The voltage converter includes:
H-bridge multilevel inverter consisting of transformer isolated converter or buck converter. The method according to claim 1,
The voltage converter includes:
A first switch having a first terminal coupled to a control signal and a second terminal coupled to a first terminal of the second capacitor;
A second switch to which the control signal is applied in a first stage and a third stage is connected to a second stage of the second capacitor;
A first diode having an anode connected to a third end of the first switch;
A second diode having a cathode connected to a second end of the second switch;
A third diode having an anode connected to the anode of the second diode and a cathode connected to the cathode of the first diode;
A first inductor having a first end connected to the cathode of the first diode and a second end connected to the first end of the third capacitor; And
And a second inductor whose first end is connected to the anode of the second diode and whose second end is connected to the second end of the third capacitor. The method according to claim 1,
Wherein the first H-bridge inverter outputs an AC voltage having the same switching frequency as the operating frequency of the load.
KR1020150044203A 2015-03-30 2015-03-30 H-bridge multi-level inverter KR101697855B1 (en)

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KR20190096696A (en) * 2018-02-09 2019-08-20 주식회사 뉴파워 프라즈마 Power Supply Apparatus including DC-AC Inverter and Method of Controlling the same
KR20200022569A (en) * 2018-08-23 2020-03-04 숭실대학교산학협력단 Isolation dc-dc converter using coupled-inductor
WO2020251717A1 (en) * 2019-06-13 2020-12-17 Intel Corporation On-package high-bandwidth resonant switched capacitor voltage regulator
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