CHROMA ATE INC.
Programmable AC Source 61500/61600 Series
Product Manager:
Galen Chou
Chroma AC Source Family
Outline
1. What is programmable AC source ?
2. What is user’s need ?
3. What do they test with AC source ?
4. Functions of Chroma AC sources
A Primitive AC Source
1. Not easy to setup
2. Inconvenient to use
3. No protection
Power Meter
Function Generator
Transformer
Power
Amplifier
C
C
AC Source Structure
AC
Input
Input
Stage
Power
Stage
Waveform Generator,
Control and Measurement
Units
Output
Stage
User
Interface
AC
Output
User
AC Source Power Stages
Linear type, a transformer on output, high impedance
Line
Input
A/D
Power
Stage
D/A
Power
Stage
AC
Output
A transformer on input, weight is heavy
Line
Input
A/D
Power
Stage
D/A
Power
Stage
AC
Output
Chroma’s AC Source Advantage
Chroma
Line
Input
A/D
Power
Stage
D/D
Power
Stage
D/A
Power
Stage
AC
Output
1. No low -frequency transformer, lighter than others
2. Standard PFC input, save power and less interference to main
3. No transformer on output, low impedance
Chroma’s AC Source Advantage
Output impedance: Zo = Ro + Lo
High impedance: Voltage drop, Current inhibit,
High frequency current filter, not good for testing IEC61000-3-2
The lab doesn’t use the AC source with a transformer on output.
Zo
AC Source
What is users’ need ?
Basic : (61500/61600 Series)
1. Clean, pure and stable sine waveform AC power
2. Measurement : Power, voltage, current Monitor
3. Line regulation test (90 – 264V, 47 - 63Hz)
4. Simulation mains for all power systems in the world
230V/50Hz, 120V/60Hz, 100V/50Hz …
5. Auto-test (Remote control)
What is users’ need ?
How much power of AC source dose user need?
Example: Test 300W (output) power supply
1. Ask the efficiency: Input power = 300W/0.8 = 375W
2. Ask the Power Factor: Input VA = 375/0.75 = 500VA
3. Ask if test OPT: Max VA = 500VA x 1.3 = 650VA
4. Ask the low line : Max input current : 650VA/90V = 7.22A
At least, the customer needs 61502/61602 (1KW)
5. Ask the inrush current: If 45Apeak is needed at 230V,
then he needs 61504/61604 (2KW)
What is users’ need ?
Additional : (61500/61600 series)
1. Power Turn ON/OFF phase angle Setting
90° Turn ON for inrush current test.
2. Inrush Current Measurement (Delay time, Interval)
3. Voltage/Frequency Slew Rate Setting
a. Operate for range scanning (90V-264V 或 47H – 63Hz )
b. Raising the voltage gradually, power on UUT
with less inrush current
4. Voltage/Frequency Save and Recall ( One-key Recall)
61500/61600 Softpanel Function
Auto Run: Programming for long time test (On/Off or Burn-in)
61500/61600 Softpanel Function
Report Function : Data Recording stored in a File
What else is users’ need ?
Only testing the specification of input power is not enough
to verify the UUT. Simulating the power like real world
is the way to get better quality and stability.
Advance Test : (61500 series only)
1. Transient Voltage Simulation
2. Distorted Waveform Simulation
Transient Output
Different kind of transient output:
Surge
Frequency Variation
Sag
Cycle Dropout
Influence of Transient Output
Example : Power supply of DVD player
+5V to memory
+3.3V to CPU
+12V to driver
When cycle dropout occurs, output voltage will drop then
back to normal level. The machine might shut down because
of improper dropping rate of voltage. (Memory might be reset,
but CPU might work as usual. )
Example for Transient Output Test
Cycle Drop Out Test
Brown Out Test
Regulation for Transient Output
IEC 61000-4-11 : Voltage dips, short interruptions and
voltage variation immunity tests
dip
short
voltage variation
100%UT
40%UT
0%UT
t (sec)
Regulation for Transient Output
IEC 61000-4-14 : Voltage fluctuation immunity test
Un + 10%Un
60s
60s
Un
60s
60s
Un - 10%Un
5s±0.5s
ΔU
5 periods 2s±0.2s 5 periods
Regulation for Transient Output
IEC 61000-4-28 : Variation of power frequency immunity test
f1+Δf
f1
120s
tp
60s
tp
tp
tp
60s
f1
120s
f1-Δf
f1
tp
f1+Δf
61500 AC Source Functions for Transient Output
LIST Mode: Program output waveform sequence by sequence
61500 AC Source Functions for Transient Output
PULSE Mode: Insert a waveform into normal voltage
61500 AC Source Functions for Transient Output
STEP Mode : Change from an initial voltage to destination
step by step
Transient Output with High Voltage
A transient high voltage of main will damage the electrical
products. (It happens usually in China and India.)
Many companies have asked it as a standard test item.
Chroma solution: Model 6560, or 2 units connecting in series….
400V/0.5sec
220V
Transient Output with High Voltage
2 units of AC Source with synchronizing signal:
Use 3-phase Mode, 61500/61600 as the Master, 61500 as the Slave.
220V with 400V/0.5s transient
Master: Fixed Mode 220V
L
N
L
UUT
Slave: List Mode 180V/0.5 sec
L
N
N
2 Units of AC Source Application
The voltage resonance happens when EMI filter plugs into the main.
Using AC Source to simulate the disturbance effect.
Combine 3 Units of AC Sources
Chroma 61500/61600 AC Source :
3 units can be combined to a 3-phase AC Power Source
(1 Master, 2 Slave units with setting the phase 120° and 240 °)
Distorted Waveform
Power Plant
Power Network
Nonlinear load pollutes the mains
with distortion current.
Io Distorted V
Pure V
Zo
L
C
Resonance Point Frequency
Fr =
1
2Π √LC
Distorted Waveform
Different kind of distorted waveform:
Interharmonic Distortion
Harmonic Distortion
Clipped Sine Waveform
Low frequency drift
Regulation for Distorted Waveform
IEC 61000-4-13 : Harmonics, Interharmonics including mains
signaling at AC power port immunity tests
Flat Curve
Over Swing
Sweep
Influence of Distorted Waveform
Comparing With/Without harmonic component:
Same UUT, 2.46A
3.015A, 22% increase
Influence of Distorted Waveform
Comparing With/Without interharmonic component:
Same UUT, 0.83A
1.3A , 57% increase
Influence of Distorted Waveform
With voltage interharmonics component:
Fi=30.85Hz, level =7% abnormal current waveform
PWM unstable
61500‘s Functions for Distorted Waveform
SYNTHESIS : Edit harmonic components (Amplitude & Phase)
of 40 orders to synthesize a new waveform. (50/60Hz)
61500‘s Functions for Distorted Waveform
INTERHARMONICS : Add a sweeping frequency component
(0.01Hz – 2400 Hz) on a normal voltage.
It helps to find the resonance point, or the weak point of the UUT.
61500‘s Functions for Distorted Waveform
WAVEFORM EDITOR : Edit waveform by harmonic orders on
softpanel, send the data and save to User
Waveform of AC Source.
It can be used on every frequency but less accuracy.
Application for AC Power Distortion
With the customers or facilities being oversea, the input power
problem can’t be solved in a short time.
Solution:
1. Measure the harmonic components by Power Analyzer on facility.
2. Re-build the waveform by SYNTHESIS function of AC Source,
RD or QC can test it on the lab.
.
Application for AC Power Distortion
Measure Harmonic components
Re-build Waveform
DC Component of AC Power
It contains DC component on some AC power sources, like UPS.
1. Current unbalance. Input rectifier may be damaged.
2. Input transformer saturation (DC current)
Using AC Source AC+DC mode to simulate.
Without DC component
With DC component
DC Output Application of AC Power
Use optional unit A615008, DC Noise Filter, when output DC
voltage. It can help to decrease the noise, and increase the stability.
Connection Method:
Analog Control for AC Source
1. DC Level Control Mode: Use an external DC voltage
to control the amplitude of output AC voltage. Frequency is
set on AC Source.
External input V
10Vdc
Output V
424Vdc
212Vdc
300V rms @300V rang
150V rms @150V rang
Analog Control for AC Source
2. AC Amplifier Mode: Send an external signal to AC source
and amplify it as the output waveform, just like the user‘s need.
External input V
10 Vdc
-10 Vdc
Output V
424 Vdc @300V rang
212 Vdc @150V rang
-424 Vdc @300V rang
-212 Vdc @150V rang
TTL signals of AC Source
1. AC_ON : Up to high level when AC source output.
Counting time interval between power-on and normal operation.
2. Synchronize (Transient) : Send a pulse signal when output change.
For external trigger or system integration
TTL signals of AC Source
3. Fault : TTL level becomes low when protection occur.
For notice or system integration
4. Remote_Inhibit : Inhibit the output when the signal becomes low.
External control for system integration.
Trigger
Live
Regulation Test
AC Source offers a pure and stable voltage to UUT.
EN61000-3-2 Limits for harmonic current emissions
EN61000-3-3 Limitation of voltage fluctuations and flicker
Haefely use Chroma AC source as a standard source.
Do you have Questions?
For more information on the Chroma 61500 / 61600 Series
AC Power Sources or if you would like to purchase one of these
models please contact your sales engineer at ValueTronics.
800-552-8258 or 847-468-8258
www.valuetronics.com