The Simulation of AC-Driven Using Half Bridge Inverter by NI Multisim for Electrochemiluminescence Cell Min-Woo Park1, Pakpoom Chansri2 and Youl-Moon Sung2,* 1
Department of Materials Engineering, Kyungsung University, Busan 608-736, Korea
2
Department of Electrical Engineering, Kyungsung University, Busan 608-736, Korea *Corresponding Author E-mail:
[email protected]
voltage constant, low power losses, soft start, soft switching, lower harmonics and low swicthing losses [7-8]. This paper is focusing on AC-driven for ECL cell devices used by half bridge inverter at output square wave which can active circuit can be response control circuit. So, we are design a half bridge inverter by simulation from software, in order to output voltage 4V 60Hz square wave. In the design is used NI Multisim which is software for design and analysis circuit in AC-driven, can be helps to reduce cost and damaged equipment.
Abstract-In design AC driven of electrochemiluminescense (ECL) cell device need to consider the stability of the circuit and the ECL cell load is important. This paper is presented simulation of AC-driven for electrochemi luminescense cell device which using half bridge inverter by software NI Multisim. The NI Multisim can be analysis and design base on operation circuit for ECL devices. The simulation results are output voltage 4V, 60 Hz square wave which presented possible to build this inverter for ECL cell AC-driven.
Keywords: Half bridge inverter, NI Multisim, electrochemiluminescense (ECL) cell device.
I.
INTRODUCTION
Currently, the researchers of light emitting devices have widely developed as light emitting diode (LED) organic light emitting diode (OLED), liquid crystal display (LCD) and other. These devices based on electrochemiluminescence (ECL) cell are organic light emission electrolyte in opposite electrode [1-2]. The ECL is interesting for researcher because new technology low-cost and high-efficiency. The power supply of ECL cell devices are used DC or AC driven based on collision between reduced and oxildized species to induce the reaction [3]. However, the application of AC-driven have been used on most ECL cell deives in followed report [2-3]. But, the researchers are still not developed a AC-driven seriously, and the load of ECL cell have low power which is caused development quite a few in AC-driven devices. The ECL cell load is must to have current constant which causes the reduced and oxildized reactions in light emitting electrolyte layer of ECL cell. The AC-driven for ECL cell devices must to input voltage to square wave which almost used low cost ac power supply or function generator for application. The serveral circuits are designed square wave output such as Push-Pull inverter, Flyback inverter, Full bridge inverter, Half bridge inverter and other inverter [4-7]. We are focusing on design a half bridge inverter for AC-driven in ECL cell devices in appilcation. The advantages of half bridge inverter are current and
Fig. 1. Block Diagram of ECL cell driven system.
II.
HALF BRIDGE INVERTER DESIGN FOR ECL CELL DEVICES
A. ECL cell driven system. The ECL cell driven system consist of two main parts are half bridge inverter and ECL cell device, show in Figure 1. This circuit is convert 20-24VDC to 4-6VAC 60Hz, output voltage is square wave used by half bridge inverter and step-down transformer for applied to ECL cell device. In the design, the ECL cell device is considering equivalent circuit load as resistance and capacitance connected in parallel which is impedance load [9]. B. Concept of Half Bridge Inverter
The half bridge inverter for ECL cell is composed two switches devices M1 and M2 are connected in parallel inverting switch and two capacitors voltage divider C1 and C2 show in Figure 2. The half bridge drives is generated the AC voltage, where the negative as well as the positive half swing transfers energy. 173
(power MOSFETs). The half bridge inverter has a power < 50W rating, that the circuit operating of half bridge inverter can be operating protection circuit as open circuit, short circuit, limit current and other. So, this power circuit has the main switching devices that carry the current load, only.
The capacitor-bridge C1 and C2 generate, in its center point, a voltage of a half Vin The primary transformer voltage can be +½ Vin and -½ Vin. So, the secondary transformer output voltage Vout can be defined as [7]
N 1 Vout Vin 2 2 N1
(1)
t DT
III.
The simulation software of half bridge inverter is used NI Multisim which is simulation software for power electronics circuit. We are interesting on NI Multisim, because can simulate simply circuit and easy multi-function and can show result output by oscilloscope function, power analyzer function, spectrum analyzer function and other functions [10]. The NI Mulisim is used NI MultisimTM 12.0 (Multisim Power Pro Edition) for simulation circuit. The simulation schematic circuit of AC-driven for ECL cell device was using half bridge inverter prototype as shown in Figure 3. The AC-driven half bridge inverter circuit is used two power MOSFETs #IRF520 Q1 and Q2 are connected in parallel inverting switch for switching frequency 60Hz, capacitor-bridge C4 and C5 = 1000 F which connected parallel with power MOSFETs and IC driven TL494 PWM controller for gate drive MOSFETs in control frequency and duty cycle equal 0.45, the step-down transformer 3:1 to 4VAC square wave in design following to reports [4-5]. So, the impedance of ECL cell load is used equipvalent circuit which is component two capacitors connected series and shunt with two zener diodes invert bisas connected series cna show Figture 3. The impedance of ECL cell can be finding from actual voltage and current as follow the reports [2-3].
(2)
When, t is rise time turn on (half cycle), T is time period (1 cycle). The duty cycle D of half bridge is 0.5 (D=0.5). Owing to, the duty cycle loss caused from leakage inductance in transformer, which will use duty cycle equal 0.45.
is1
M1 C1 Vi
vDS1 N1:N2
M2
is2
RL
C2
SIMULATION OF HALF BRIDGE INVERTER DESIGN
vDS2
Fig. 2. Half bridge inverter.
The ECL cell devices are required output voltage square wave which is operating switch at low frequency (60Hz). The operation of half bridge inverter can determine square waveforms on gate drive of switches
XSC4
XSC1
Ext Trig +
Ext Trig +
T3
_ B
A
T4
+
_
+
_
+
XCP1 1 V/mA
1:1
_ B
A _
+
_
XSC2
1:1 Ext Trig + _ B
A +
R1 15kΩ
+
_
XSC3
V1 20 V
4
DTC
3
R2
_
DA1
Vcc
8
FB
C3 1 4700µF 2
20kΩ 66 % Key=A
12
16 15 14
IN1
C2
-IN1
E2
IN2
Rt
-IN2 Ref
T1 R3 68Ω
9
E1
11
GND
22Ω 1:1
R9 25kΩ XCP2 1 V/mA
10 6
C1
Ct_ctrl 5 Ct
7
Fig. 3.
C1
Q1 IRF840
R4
OTC
13
R5 50kΩ 55 % Key=A
0.33µF
XCP3 R8 1 V/mA
C2 20µF
Q2 IRF840
R6
R10 25kΩ
C5 1000µF
D2 6V C6 30µF
The schematic diagram of AC-driven ECL cell using half bridge inverter by IN Multisim.
174
Ext Trig +
100Ω 93 % Key=A
_
D3 6V
B
A +
2.6:1
22Ω R7 68Ω
TL494NC_5
C4 1000µF T2
_
+
_
IV.
EXPERIMENTAL SIMULATION RESULTS
Figure 6. The voltage and current output waveform was according the report [2-3].
The simulation results of AC-driven for ECL cell device using half bridge inverter circuit is voltage of two MOSFETs Q1 and Q2 in NI multisim and output voltage load. In Figure 4 is show switching voltages of gate-source power MOSFETs which are switches frequency at 15.6 V.
Vo
Io vGS1
Fig. 6. The output voltage and current waveforms of ECL cell driver
vGS2
using half bridge inverter.
V. Fig. 4. The output gate-source voltage waveforms vGS1 and vGS2.
In Figure 5(a) and 5(b) are the output drain-source voltage and source current vDS1, iS1 and vDS2, iS2 of MOSFETs switch between working at 19.74V and 11.91mA, respectively. The both MOFETs at drain-source voltage and source current are concept of zero-voltage-switching (ZVS), is voltage drops to zero and current increases. From Figure 5(a) and (b) are shows in rise time peak current is swing overshoot owing to have leakage inductance in transformers.
vDS1
CONCLUSION
The simulation of AC-driven for ECL cell device using half bridge inverter by software IN Multisim. This schematic circuit of half bridge inverter is designed circuits which convert DC to AC square wave. The results output voltage and current at 60Hz square wave ware 4.05V and 71.15mA, respectively. Form the simulation can be possible to design and build ACdriven for ECL cell used by half bridge inverter. ACKNOLEDGMENT This work was supported by Molecular Instittue of Science and Technology / Program for Molecular Electronics and Devices System. REFERENCES
iS1
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waveforms vDS1, iS1 and vDS2, iS2
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