4-058

平成 30 年電気学会全国大会

Single-Phase Current-Source AC/DC/AC Conversion
System with Reduced Switching Device Counts
Eka Rakhman Priandana

Noguchi Toshihiko

Graduate School of Science and Technology
Shizuoka University
Hamamatsu, Japaneka.rakhman.priandana.17@shizuoka.ac.jp

Graduate School of Science and Technology
Shizuoka University
Hamamatsu, Japan
noguchi.toshihiko@shizuoka.ac.jp

Abstract—Single-phase current source AC/DC/AC conversion
system with reduced switching device counts is presented in thepaper. Since current-source type has natural short circuit
protection and switching device becomes more reliable, as well as
new magnetic materials that allow to build more efficient anddense inductors, this technology is proposed as alternative
solution for power electronic circuits. By applying duality
principle to the single-phase voltage-source conversion system,
the proposed conversion system can convert 100V/60Hz to
220V/50Hz with 84% efficiency as a result of the circuitsimulation.

The AC input current is rectified and then inverted withdifferent amplitude and frequency compared to the input. The
proposed system has three operation modes: charging,circulating, and discharging. Fig.2 describes the operation
mode of rectifier side that will happen when Q1 and Q2 areactivated alternately. When the current flows in one direction,
Q1 on and Q2 off, the current in L1 will be circulating and thecurrent in L2 will be discharged. In contrary, the L1 will becharged and the current in L2 will be circulating. When thecurrent flows in opposite direction, the events that happen in
L1 and L2 will be exchanged.

Keywords—current-source; duality principle; voltage-source;
circuit simulationI.

INTRODUCTION

The Voltage Source Converters (VSCs) have been widely
studied since researchers developed switching device with low
conduction losses, i.e. IGBT. Alongside the IGBTs, the VSCs
include capacitors which are a reliable component and having
relatively high-power density. Meanwhile, the Current Source
Converters (CSCs) are less applied due to two maindrawbacks: high conduction losses and its low-power density.
Nevertheless, the advantages of CSCs family such as low
input current harmonics, natural protection from short circuit,and boost capability cannot be denied [1].
Researchers recently have developed Reverse Blocking
IGBT (RB-IGBT), which is presenting lower conduction
losses [2]. This device will assist continuing investigation in
CSC technologies. Moreover, advance magnetic material
application makes inductors become more dense and efficient[3]. Therefore, CSC has a good prospect to be developed again.
The CSCs family that derived from VSCs can be used as analternative solution for power electronics circuits
This paper will propose single-phase current source halfbridge AC/DC/AC converters as the duality circuit of single
phase voltage source half-bridge AC/DC/AC converters andpresent its performance according to the simulation results.
II.

Fig. 1. Single-phase current-source half bridge AC/DC/AC converters.

SINGLE-PHASE CURRENT SOURCE HALF-BRIDGE
AC/DC/AC CONVERTERS

Fig.1 shows the proposed single-phase current source halfbridge AC/DC/AC converters as duality principle [4] of singlephase voltage source half-bridge AC/DC/AC converters [5].
Fig. 2. Rectifier side operation modes.

2018/3/14～16

九州-94-©2018 IEE Japan

4-058平成 30 年電気学会全国大会

Fig. 3. Inverter side operation modes.

-PI
CONTROL

LIMITER+-PI
CONTROLRMSS1X

LIMITERCOMPS2DC CURRENT+INPUT SINE
GENERATORTRIANGLE
GENERATOR

Fig. 5. Simulation results.

S3
INPUT
PLL

COMP

S4



OUTPUT SINE
GENERATOR

Fig. 4. Control system of proposed converters.

Fig.3 describes the operation mode of inverter side thatwill happen when Q3 and Q4 are activated alternately. When
the Q3 on and Q4 off, the current in L1 will be circulating andthe current in L2 will be discharged. In contrary, the L1 will
be discharged and the current in L2 will be circulating.
Fig.4 describes this proposed converter’s control system.
The output rms voltage is maintained by controlling DC
currents. Therefore, Q1 and Q2 are driven by PWM generator
which is its reference affected by output voltage error, DC
current error, and input sinusoidal waveform. Meanwhile, Q3
and Q4 are driven by independent PWM generator with fixed
modulation index of 0.8.

Fig. 6. Enlarged input simulation result.

IV.
III.

SIMULATION RESULTS

In order to verify the proposed converters performance, asimulation was conducted. In the simulation, several
parameters were determined such as the AC input uses
100V/60Hz and it will be converted to 220V/50Hz, reactor L1and L2 use 100mH each, and the heavy inductive load uses R= 13.9 and L = 10mH. Fig.5 shows the simulation results.
The upper graph is DC link current that consists of L1 current
and L2 current. The middle graph indicates the input voltagecurrent and the lower graph indicates output voltage-current.
It is shown that the output voltage was generated
arbitrarily and higher than its input. Meanwhile, in Fig.6 input
current showed unity power factor with relatively low
harmonics. Table 1 summaries the electrical measurements ofthe simulation results. From Table 1, the efficiency of this
proposed converters can be calculated as 84.21%.
TABLE I.
InputOutput

Freq
60 Hz
50 HzVoltage
100 V
215.5 V

THD-V
0.1%
1.94%

Current
38.69 A
15.12 AThe single-phase current source AC/DC/AC conversion
system with reduced switching device counts has beenpresented with simulation results. By providing boost
capability, unity power factor, low input harmonics, and highefficiency, the converters can be applied as an alternativesolution for power electronics circuit. In order to verify thesimulation, the proposed circuit is currently being investigatedin several experiments.
REFERENCES
[1]

[2]

[3]

ELECTRICAL MEASUREMENTS.
THD-I
3.84%
0.69%

[4]

[5]

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CONCLUSION-95-

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480-487.
T. Naito et. al., “1200V reverse blocking IGBT with low loss for matrix
converter,” Power Semiconductor Devices and ICs, 2004. Proceedings.
ISPSD ’04. The 16th International Symposium, May 2004, pp. 125 –128.
H. Chan et. al., “Study on magnetic materials used in power transformerand inductor,” in Power Electronics Systems and Applications, 2006.
ICPESA ’06. 2nd International Conference, Nov 2006, pp. 165–169.
S. D. Freeland, "Techniques for the practical application of duality topower circuits," in IEEE Transactions on Power Electronics, vol. 7, no. 2,
pp. 374-384, Apr 1992.
C. B. Jacobina et. al., "DC-link single-phase to single-phase half-bridgeconverter operating with reduced capacitor current and AC capacitor
power," 2006 37th IEEE Power Electronics Specialists Conference, Jeju,
2006, pp. 1-7.

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