DSC-544 [ETC]
Resolver and Synchro Conversion Modules|HIGH POWER. INTERNAL TRANSFORMERS ; 解析器和同步转换模块|大功率。内部变压器\n
| 型号： | DSC-544 |
| 厂家： | 
ETC |
| 描述： | Resolver and Synchro Conversion Modules|HIGH POWER. INTERNAL TRANSFORMERS
|
| 文件： | 总6页 (文件大小：187K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
DS C-5 4 4
1 4 -BIT DIGITAL-TO-S YNCHRO CONVERTER
HIGH EFFICIENCY: P OWERED FROM
REFERENCE INP UT
FEATURES
DESCRIPTION
Power Dissipation Cut In Half:
- 4.5 VA at 400 Hz Dissipates 6 W
- 1.5 VA at 60 Hz Dissipates 3 W
•
improved transient response and neg-
ligible scale factor variation.
The DSC-544 digital-to-synchro
(D/S) converter compliments DDC’s
low profile DSC-644 industry stan-
dard by providing additional features.
The DSC-544 has a 0.82” high profile
and standard pinouts. The need for
+15 V and -15 V power supplies has
been eliminated. The unit is powered
from the reference input by an inter-
nal pulsating power supply, making it
very efficient. The reduced heat dis-
sipation has made it possible to
increase the load at 400 Hz by a fac-
tor of three, and the power output at
60 Hz is limited only by the size of the
internal power transformer.
APPLICATIONS
No External +15 V or -15 Supplies
Required
•
•
•
The DSC-544 is the preferred D/S con-
verter when its special features are
required: elimination of external ±15 V
power supplies, elimination of an exter-
nal transformer at 60 Hz, greater drive
capability at 400 Hz, and less heat dis-
sipation. The converter can be used in
many applications where digitized shaft
angle data must be converted to syn-
chro form to drive control transformers,
control differential transmitters, and
angle indicators. Because these con-
verters are very rugged, and meet the
requirements of MIL-STD-202, they are
suitable for the most severe industrial
and military applications, including mili-
tary ground support and avionics. They
are very useful in computer-based sys-
tems where digital-to-synchro informa-
tion is used, such as simulators, flight
trainers, flight instrumentation, and fire
control systems.
No External Transformer Required
at 60 Hz
Reliable:
- Rugged Power Amplifiers with
Current Limiting
- Short Circuit Protection
- Overvoltage Transient
Protection
The DSC-544 also retains the many
improved features of the DSC-644.
The output is fully protected against
overloads, transients from load kick-
backs, short circuits and overheating.
An aluminum top plate in the module
improves thermal dissipation. In addi-
tion, the circuit design provides a
smoother, more accurate output with
- Thermal Cutoff
Digital Input:
- CMOS and TTL Compatible
- Parallel Binary Angle Input
•
•
Output:
- Transformer-Isolated
- 90 V Synchro Output at 400 Hz
and 60 Hz
OUTPUT ISOLATION
SECTION
RH
POWER
TRANS-
FORMER
REFERENCE
INPUT
PULSATING
POWER
SUPPLY
D/R POWER
SUPPLY
RL
REF INPUT ISOLATION
SECTION
RH
REFERENCE
TRANS-
FORMER
S1
SIN
S
C
OUTPUT
ISOLATION
TRANS-
DIGITAL
TO
RESOLVER
CONVERTER
OUTPUT
POWER
AMPLIFIERS
RL
SYNCHRO
OUTPUT
S2
S3
COS
FORMER
MSB
BIT 1
DIGITAL
INPUT
BIT 14
LSB
GND
+5V
FIGURE 1. DSC-544 BLOCK DIAGRAM
1981, 1999 Data Device Corporation
©
INTRODUCTION
TABLE 1. DSC-544 SPECIFICATIONS
PARAMETER VALUE
RESOLUTION
The DSC-544 circuit is divided into three parts which are trans-
former-isolated from each other (see FIGURE 1). The first part
contains the reference input, the second part contains the digital
input and an internal digital-to-resolver (D/R) converter, and the
third part contains output power amplifiers and an associated
pulsating power supply.
14 bits
ACCURACY (TO FULL LOAD)
Output Accuracy
±4 minutes
Differential Linearity
±1 LSB max
Reference input isolation is provided by the reference trans-
former and by the power transformer. The converter output sig-
nals are proportional to the applied reference, and any distortion
in the reference input will appear in the output signals. The
power transformer has a voltage clamp which protects the power
amplifiers against transients in the reference input.
ANALOG OUTPUT
(TRANSFORMER-ISOLATED)
Drive Capability (L-L Balanced)
Synchro Output
90V rms L-L, 360-440 Hz
Option H
90V rms L-L, 57-63 Hz
Option I
1.33 kΩ min
4.0 kΩ min
The internal D/R converter in the DSC-544 operates from an
internal power supply connected to the reference input. The cir-
cuit in the internal D/R is based on an algorithm whose theoreti-
cal math error is only ±3.5 arc-seconds (less than 5% of 1 LSB)
and whose theoretical scale factor variation with angle is less
than ±0.015%. The output is clean, with negligible glitches at
major transition points. The accuracy and scale factor errors are
not limited by the physical components, but by the algorithm.
Output Scale Factor
Absolute (All Causes)
±2% max simultaneous
amplitude variation on all
output lines, including
variation with digital angle.
Output amplitude tracks
reference input amplitude.
±0.1% max
Variation With Digital Angle
Output Quadrature
±0.2% max
The digital inputs are transient-protected CMOS switches with
33 kΩ pull-up resistors that are connected to the +5 V supply, and
can be driven by all standard TTL gates. If the TTL gates drive
other loads as well, the circuit must allow the 33 kΩ resistors to
pull-up the logic 1 level to within 1.0 V of the +5 V supply. Bit
weights for the 14 binary inputs are given in TABLE 2. The angle
is determined by adding bits that are in the logic 1 state.
DIGITAL INPUT
Logic Type
Natural binary angle.
parallel positive logic
TTL compatible
Transient protected CMOS
33 kΩ pull-up to +5 V
Loading
0.13 Std TTL loads
The output amplifiers will drive loads
with any phase angle from -90° to +90°.
TABLE 2. BIT WEIGHT TABLE
REFERENCE INPUT
(TRANSFORMER-ISOLATED
Reference Voltage Level
Max Voltage Without Damage
Current
DEG/BIT
BIT
MIN/BIT
115V rms ±10%
138V rms
1 MSB
180
10,800
2
3
4
5
6
7
8
9
10
11
12
13
90
45
22.5
5,400
2,700
1,350
675
No Load
Option H
Option I
Additional With Load
40 mA max
50 mA max
1 mA per mA of load
11.25
5.625
2.813
1.406
0.7031
0.3516
0.1758
0.0879
0.0439
0.0220
337.5
168.75
84.38
42.19
21.09
10.55
5.27
POWER SUPPLY
Voltage
Max Voltage Without Damage
Current
+5 V±5%
+7 V
20 mA max
TEMPERATURE RANGES
Operating (Temperature Of Metal
Plate On Top Of Case)
-1 Option
2.64
1.32
14 LSB
-55°C to +85°C
0°C to +70°C
-3 Option
Storage
-55°C to +125³C
The output section of the DSC-544 offers the most benefits to its
users. The pulsating power supply produces two unfiltered, full-
wave-rectified positive and negative voltages (see FIGURE 2).
These voltages are in phase with the amplifier output voltage
because power is derived from the reference input. The ampli-
tude of the two voltages only needs to be a few volts greater than
the power amplifier voltage, since both will change together if the
reference voltage level changes. As FIGURE 2 indicates, the
PHYSICAL CHARACTERISTICS
Size (Encapsulated Module)
3.125 x 2.625 x 0.82 inches
(7.94 x 6.67 x 2.08 cm)
8 oz (227 gm)
Weight
NOTE:These specifications apply over operating temperature and
frequency range, ±5% power supply variation, ±10% reference
amplitude variation, up to 10% harmonic distortion on reference
input, and for any load up to full load.
2
positive and negative pulsating power supply voltage levels will
consistently be lower than the constant DC levels of the DC sup-
ply. Since the voltage levels are lower, the power consumed will
be much less. The power dissipated as heat is equal to the
amplifier current times the difference in voltage between the
power supply and the output. For the DSC-544, the power dissi-
pated is reduced by approximately 50% for reactive loads.
tal input angle. A(θ), which is called the scale factor variation, is
a smooth function of θ without discontinuities and is less than
±0.001 for all values of θ. The total maximum variation of Ao
(1 + A(θ)) is therefore ±2%. Because A(θ) is so small, the DSC-
544 can be used to drive systems such as X-Y plotters or CRT
displays in which the sine and cosine outputs are used indepen-
dently (not ratiometrically as in a control transformer).
Another advantage of deriving power from the reference input is
that the amplifier section power is easily transformer-isolated
from the D/R converter. The converter output isolation trans-
former can therefore be located in front of the power amplifiers.
Since it does not transfer power, it can be made smaller and an
internal transformer can be used for 60 Hz.
S1-S3 = V
SINθ
MAX
+ V
MAX
360
Minimum load impedances are listed in TABLE 1, under Drive
Capability. The DSC-544 is capable of driving the specified load
impedances under worst case conditions. The minimum load
impedances correspond to 4.5 VA at 400 Hz and 1.5 VA at 60 Hz
when frequencies and voltage levels are at their nominal values.
0
30
90
150
210
270
330
θ
(DEGREES)
CCW
- V
MAX
S3-S2 = V
SIN(θ + 120°)
MAX
Adequate air circulation is required over the metal top of the con-
verter module. A thermal cutout will disable the converter’s out-
put amplifiers if its internal temperature reaches 125°C. The out-
put is automaticlly restored when the temperature drops below
125°C.
S2-S1 = V
SIN(θ + 240°)
MAX
FIGURE 3. SYNCHRO OUTPUT SIGNALS
+DC SUPPLY LEVEL
+v
POSITIVE PULSATING
SUPPLY VOLTAGE
AMPLIFIER OUTPUT
VOLTAGE ENVELOPE
DRIVING CT AND CDX LOADS
When driving CT and CDX loads the DSC-544 must have
enough steady-state power capability to drive the Zso of the
load. Zso (stator impedance with rotor open-circuited) is mea-
sured as shown in FIGURE 4.
NEGATIVE PULSATING
SUPPLY VOLTAGE
-DC SUPPLY LEVEL
- v
FIGURE 2. PULSATING POWER SUPPLY
VOLTAGE WAVEFORMS
S3
2/3 Z
so
OUTPUT PHASING AND SCALE FACTOR
The analog output signals have the following phase relationship
and are shown in FIGURE 3.
Z
= R + jX
L
so
S1-S3 = (RH-RL) Ao [1 + A(θ) sin θ]
S3-S2 = (RH-RL) Ao [1 + A(θ) sin (θ + 120°)]
S2-S1 = (RH-RL) Ao [1 + A(θ) sin (θ + 240°)]
2/3 Z
so
2/3 Z
so
S1
S2
The output amplitudes simultaneously track the reference volt-
age fluctuations because they are proportional to (RH-RL). The
amplitude factor Ao is 90/115 for 90V rms L-L output. The max-
imum variation in Ao from all causes is ±1.9%. The
term A(θ) represents the variation of the amplitude with the digi-
FIGURE 4. ZSO MEASUREMENT
3
TABLE 3 lists the load impedance of some typical control trans-
formers. Control transformers are highly inductive loads and it is
possible to save power by tuning inductive loads. Three capaci-
tors may be placed across the legs of the synchro stator in a
delta configuration as shown in FIGURE 5.
ACCURACY TESTS
The accuracy of the DSC-544 may be tested with a high accura-
cy synchro/resolver angle indicator and a load such as a control
transformer (see FIGURE 6). The bits switched are set to the
desired angle and the output angle is measured under load. The
accuracy should conform to the specifications.
TABLE 3. TYPICAL CONTROL TRANSFORMERS
AND THEIR LOAD IMPEDANCES
REFERENCE
MILITARY
ZSO
SIZE
PART NUMBER
SYNCHRO OR
MSB
LSB
RESOLVER
SIGNALS
BIT 1
DSC-544
BIT 14
26V 08CT4c
26V 11CT4d
11CT4e
08
11
11
15
15
18
18
23
23
100 + j490
21 + j132
S/R ANGLE
INDICATOR
AP-30711
838 + j4955
1600 + j9300
1170 + j6780
1420 + j13260
1680 + j5040
1460 + j11050
1250 + j3980
15CT4c
15CT6b
18CT4c
18CT6b
23CT4a
23CT6a
CT LOAD
FIGURE 6. ACCURACY TEST CIRCUIT
The correct value of the capacitance C in Farads is given by:
X
L
C =
2
2
TEST METHODS
4πfR + X
L
The DSC-544 converter modules are high-quality products
whose semiconductor components are hermetically sealed.
These modules will meet the specific test methods and condi-
tions of MIL-STD-202E (see TABLE 4) unless alternative meth-
ods are specified by the customer in his procurement documen-
tation.
where f is the carrier frequency and R and X are the series real
L
and reactive components of Z . High grade capacitors must be
so
used and they must be able to withstand the full AC output volt-
age.
When the load has been tuned more loads can be driven in par-
allel, the load impedance Z is increased to :
TABLE 4. MIL-STD-202E TEST METHODS
2
2
R + X
L
Z =
CONDITION
COMMENT
METHOD
R
204C
213B
106D*
107D
101D
105C
C
A
--
A
B
B
10G, 2000 Hz vibration
50G, 11 ms shock
Moisture
Thermal shock
Salt spray
S3
50,000 ft, altitude
* when conformally coated on P.C. board
C
C
S1
S2
C
FIGURE 5. DELTA TUNING CONFIGURATION
4
Drawing not to scale.
Dim e nsio ns in inc he s (m m ).
+
2.625 0.015
-
(66.68)
+
0.040 0.002
-
(1.02)
Dia (Typ)
14 LSB
+
+
13
12
11
10
9
+
+
S3
S2
S1
+
8
0.015
3.125
(79.38)
-
0.82
(20.82)
(Max)
+
7
Notes:
GND
6
1. Pin labels on bottom view are for reference only.
2. All dimensions shown are in inches (mm).
3. Pin material meets solderability requirements of
MIL-STD-202,Method 208C.
4. Case material is glass filled Diallyl Phthalate per
MIL-M-14, Type SDG-F, except top surface is black
anodized aluminum plate for heat transfer.
5. Any LSB pins not used should be grounded.
5
+
+
0.26 +
-
4
0.01
+5V
RL
(6.604)
3
2
RH
1 MSB
0.20 +
0.01
(Typ)
(Tol Noncum)
-
(5.08)
2.2 +
0.25
(6.35)
(Min)
0.10
(55.88)
-
0.21+0.01
-
(5.334)
FIGURE 7. DSC-544 MECHANICAL OUTLINE
ORDERING INFORMATION
DSC-544-X-X-R
R = Enhanced Reliability
Operating Temperature Range of Case (Metal Top):
1 = 55° to +85°C
3 = 0° to +70°C
Synchro Output Voltage Level and Frequency:
H = 90 V L-L, 360 - 440 Hz
I = 90 V L-L, 57 - 63 Hz
Note: If a socket is required, order part number 9010.
5
The information in this data sheet is believed to be accurate; however, no responsibility is
assumed by Data Device Corporation for its use, and no license or rights are
granted by implication or otherwise in connection therewith.
Specifications are subject to change without notice.
105 Wilbur Place, Bohemia, New York 11716-2482
For Technical Support - 1-800-DDC-5757 ext. 7389 or 7413
Headquarters - Tel: (631) 567-5600 ext. 7389 or 7413, Fax: (631) 567-7358
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West Coast - Tel: (714) 895-9777, Fax: (714) 895-4988
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Asia/Pacific - Tel: +81-(0)3-3814-7688, Fax: +81-(0)3-3814-7689
World Wide Web - http://www.ddc-web.com
ILC DATA DEVICE CORPORATION
REGISTERED TO ISO 9001
FILE NO. A5976
E-03/00-0
PRINTED IN THE U.S.A.
6
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