how to order - I.C.T. Power Company Inc.
how to order - I.C.T. Power Company Inc.
how to order - I.C.T. Power Company Inc.
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•<br />
5780 Thornwood Drive<br />
Goleta, California 93117<br />
www.enerpro-inc.com<br />
Number PD744<br />
September 29, 2000<br />
THE MVTB FAMILY OF FIBER-OPTICALLY COUPLED<br />
MEDIUM VOLTAGE THYRISTOR TRIGGER BOARDS<br />
Introduction<br />
The MVTB family of Medium Voltage<br />
Trigger Boards offers engineers a turnkey<br />
solution for thyris<strong>to</strong>r-based systems<br />
requiring enhanced hard dc gate drive with<br />
complete control electronics isolation.<br />
Fiber-optically coupled gate commands allow<br />
unlimited voltage isolation between the<br />
delay determina<strong>to</strong>r logic unit and the trigger<br />
board. The MVTB drives thyris<strong>to</strong>rs fed with<br />
up <strong>to</strong> 2400 Vac (4160 Vac by January 2001)<br />
with respect <strong>to</strong> the trigger board control<br />
circuit power supply. This isolation is<br />
accomplished with high-voltage pulse<br />
transformers and with creepage in<br />
conforming <strong>to</strong> EN 50178 and UL 840.<br />
Key Specifications<br />
• 4 A/µs Initial Gate Current Rate-of-Rise<br />
• 2 A Initial Peak Current<br />
• 0.5 Adc Sustaining Current for 120 deg.<br />
• Pulse Transformer Isolation >5000 Vac<br />
• Gating & Bias-Supply Status Read-Back<br />
Applications<br />
High isolation voltage and fast, high current<br />
gate drive make the MVTB trigger board<br />
especially suitable for high power rectifiers,<br />
inverters and ac controllers using:<br />
• Advanced Design Thyris<strong>to</strong>rs<br />
(<strong>to</strong> 12 kV Blocking Voltage)<br />
• Series-Connected Thyris<strong>to</strong>rs<br />
• Multiple Converters Series Connected<br />
• Parallel-Connected Thyris<strong>to</strong>rs<br />
Specific Applications <strong>Inc</strong>lude:<br />
• Sub-Cycle ac Transfer Switches<br />
• 1200 V <strong>to</strong> 4160 V Mo<strong>to</strong>r Starters<br />
• MV or HV* Rectifiers With Series-<br />
Connected Thyris<strong>to</strong>rs<br />
• Rectifiers for High Energy Physics<br />
• Plasma Arc Rectifiers<br />
• Pulsed <strong>Power</strong> Systems<br />
*A floating trigger board power supply permits<br />
MVTB operation at an arbitrarily high voltage.<br />
The MVTB-6, Six-Channel Trigger Board s<strong>how</strong>n above is ideal for 2.4 kV mo<strong>to</strong>r soft start systems.<br />
Number PD744 - 1 - PD744 - MVTB Family.doc
Background<br />
The MVTB family was developed <strong>to</strong><br />
accommodate three specific requirements:<br />
First, many industrial environments require<br />
the electrical isolation, noise immunity and<br />
enhanced safety provided by fiber optic<br />
signal transmission.<br />
Second, stringent power quality regulations<br />
frequently necessitate control at medium<br />
voltages, such as sub-cycle transfer<br />
switches and mo<strong>to</strong>r soft starters.<br />
Third, large systems such as pulse<br />
amplifiers and power supplies for highenergy<br />
physics often use series or paralleled<br />
devices. These devices often require dc<br />
gating with high open-circuit voltage, high<br />
peak currents and short rise time pulses.<br />
This helps ensure a small spread in the<br />
turn-on times and adequate immunity<br />
against gate inversion.<br />
Circuit Operation<br />
Each channel of a MVTB board is made up<br />
of four sections: 1) fiber optic receiver and<br />
gating logic, 2) driver stage and pulse<br />
forming network, 3) isolation transformer,<br />
and 4) output rectifier and terminating<br />
resis<strong>to</strong>r.<br />
Fiber-optic receiver (FOR) converts the<br />
gate command light signal in<strong>to</strong> the logic<br />
signal *A. The *A signal is characterized by<br />
a square wave pulse train of 256 pulses at a<br />
nominal frequency of approximately 23kHz<br />
and 5.6 ms duration when the mains<br />
frequency is 60 Hz.<br />
This gate command pulse train is standard<br />
output on all of Enerpro’s firing boards.<br />
Firing cards can be specified with optional<br />
fiber-output pulse modules. The modules<br />
are also available as drop-in field-upgrades<br />
for existing Enerpro boards.<br />
Medium Voltage Trigger Board System<br />
(One Channel S<strong>how</strong>n)<br />
"Blue"<br />
Fiber-<br />
Optic<br />
Links<br />
"Gray"<br />
System Controller<br />
Gate<br />
Command<br />
Receiver<br />
R-2522<br />
"BLUE"<br />
Status<br />
Transmitter<br />
T-1522<br />
"GRAY"<br />
*A<br />
Gating<br />
Logic<br />
(Gate Delay Determina<strong>to</strong>r Board)<br />
Status<br />
Logic<br />
+<br />
H<br />
L<br />
39Ω<br />
+30 V<br />
"GATE ON"<br />
"FAULT"<br />
Current<br />
Limiting<br />
Resis<strong>to</strong>r<br />
Gate<br />
Driver<br />
22µ<br />
22µ<br />
+ +<br />
2Ω<br />
Pulse<br />
Forming<br />
Network<br />
22Ω<br />
6000V<br />
Isolation Barrier<br />
2T<br />
Toroidal<br />
Isolation<br />
Transformer<br />
5T<br />
Pulse<br />
Rectifier<br />
200Ω<br />
G<br />
K<br />
A<br />
K<br />
Bias Supply<br />
(Grounded or Floating)<br />
24 Vac / 30 Vdc<br />
10VA per Channel<br />
5A<br />
COM<br />
Vth H<br />
Vth L<br />
IN<br />
Bias<br />
Supply<br />
+ 30 V<br />
+13V<br />
+5 V<br />
"POWER ON"<br />
MVTB Board<br />
E1193 MVTB Block Diagram.McDraw<br />
Block diagram s<strong>how</strong>ing the Medium Voltage Trigger Board system’s. basic functionality.<br />
Number PD744 - 2 - PD744 - MVTB Family.doc
Gate Drive Stage<br />
Logic converts the *A signal in<strong>to</strong> high- and<br />
low-side power MOSFETs. The logic<br />
disables the driver in the absence of gate<br />
command. The half-bridge applies 128<br />
positive and 128 negative pulses <strong>to</strong> the<br />
transformer’s 2-turn primary over a period<br />
of 1/3 of the mains voltage cycle.<br />
The <strong>to</strong>roidal pulse transformer is wound<br />
with corona-resistant, high voltage wire<br />
rated for 7.5kV nominal (20 kV B.I.L.).<br />
Additionally, PCB slotting and ample<br />
creepage distance assure >5000 Vac<br />
isolation. MVTB boards are available with<br />
potted outputs and higher voltage wire for<br />
isolation <strong>to</strong> 20 kV (80 kV B.I.L.).<br />
Output Pulse Characteristics<br />
The bipolar square wave signal derived<br />
from the 5-turn secondary is full-wave<br />
rectified in<strong>to</strong> a direct current pulse. The<br />
amplitude is initially 30 V decaying <strong>to</strong> ≈12 V<br />
as the half-bridge capaci<strong>to</strong>rs discharge. The<br />
primary-side pulse-forming network creates<br />
high-amplitude initial gate current (2.0 A)<br />
and a lower amplitude (0.5 A) sustaining<br />
current.<br />
The fast recovery rectifiers and 200Ωterminating<br />
resis<strong>to</strong>r provide added noise<br />
immunity and gate reversal protection.<br />
Status Readback<br />
The fiber-optic transmitter (FOT) for each<br />
channel outputs a diagnostic light signal. In<br />
normal operation, the output of the<br />
primary-side gate driver is converted <strong>to</strong> a<br />
logic signal that drives the pho<strong>to</strong>diode of<br />
FOT. The result is a light signal that<br />
mimics the gate command. The bias<br />
supply’s window compara<strong>to</strong>r will turn on<br />
the FOT continuously if the nominal +30 V<br />
supply is outside preset thresholds.<br />
On-Board LED Diagnostics <strong>Inc</strong>lude:<br />
• “POWER ON” indicates board power<br />
• “GATE ON” indicates gate activity<br />
• “FAULT” indicates bias out-of-range<br />
Circuit Board<br />
The circuit boards are assembled at the<br />
Enerpro plant in Goleta, California and are<br />
made by a UL listed fabrica<strong>to</strong>r from 0.093-<br />
in. (2.36-mm) thick FR4 fire-resistant<br />
epoxy-fiberglass laminate. All creepage<br />
distances conform <strong>to</strong> UL 508 and VDE<br />
0110. Boards are conformal-coated (MIL-1-<br />
46058 [Type UR]).<br />
The boards are designed for operation from<br />
0°C <strong>to</strong> +65°C. The boards require forced air<br />
cooling (75 CFM across length of board) at<br />
ambient temperatures above 35°C.<br />
Rugged AMP Mate-N-Lok connec<strong>to</strong>rs are<br />
used for cus<strong>to</strong>mer electrical interface and<br />
are keyed <strong>to</strong> simplify maintenance and<br />
ease trouble-shooting.<br />
Open Circuit Voltage (2 x 30° Bursts Mode).<br />
Ordering Information<br />
Please contact Enerpro for assistance or<br />
use the following "How <strong>to</strong> Order"<br />
worksheet <strong>to</strong> determine the correct part<br />
number. Consult Enerpro’s applications<br />
and design-engineering staff for assistance<br />
when specifying thyris<strong>to</strong>r gate drivers for<br />
cus<strong>to</strong>m applications.<br />
Number PD744 - 3 - PD744 - MVTB Family.doc
HOW TO ORDER<br />
Model<br />
Number Medium Voltage Fiber-Optically Coupled Trigger Board<br />
Code Output Configuration<br />
1<br />
2<br />
3<br />
4<br />
6<br />
Single Output<br />
Dual Output<br />
Triple Output<br />
Quad Output<br />
Hex Output<br />
Code Thyris<strong>to</strong>r Gating Configuration<br />
- Independent Command Inputs<br />
S Single Command Input<br />
Code Physical Configuration<br />
- Standard One-Piece Construction<br />
X Separated Output Circuit Construction<br />
Code Mains Voltage ( In kilovolts)<br />
Code Board Supply Voltage<br />
24 24 Vac<br />
30 30 Vdc<br />
MVTB - - - - -<br />
For more information:<br />
Please contact Enerpro, <strong>Inc</strong>. by telephone at (805) 683-2114, 7:00 A.M. <strong>to</strong> 5:00 P.M.<br />
(PST), M-F, or e-mail Enerpro via Frank Peter Wahl at f.wahl@enerpro-inc.com.<br />
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Version 9/29/00<br />
Number PD744 - 4 - PD744 - MVTB Family.doc