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參數(shù)資料
| 型號： | SDC-19206-302 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 位置變換器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, DIP40 |
| 封裝： | 1.140 X 2.020 INCH, 0.230 INCH HEIGHT, TDIP-40 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 124K |
| 代理商： | SDC-19206-302 |
3
INTRODUCTION
The SDC-19204/6 Series are small, 40-pin TDIP synchro-to-dig-
ital hybrid converters. As shown in the block diagram (FIGURE
1), the SDC-19204/6 can be broken down into five functional
parts:
1. Signal Input Option
2. Converter
3. Analog Conditioner
4. Power Supply Conditioner
5. Digital Interface.
SIGNAL INPUT
In a synchro, shaft angle data is transmitted as the ratio of carri-
er amplitudes across the input terminals. Synchro signals, which
are
of
the
form
sin
θcosωt,
sin(
θ+120°)cosωt
and
sin(
θ+240°)cosωt are internally converted to resolver format;
sin
θcosωt and cosθcosωt. FIGURE 2 illustrates synchro signals
as a function of the angle
θ.
CONVERTER OPERATION
As shown in FIGURE 1, the converter section of the SDC-
19204/6 contains a high accuracy control transformer, demodu-
lator, error processor, voltage-controlled oscillator (VCO),
up/down counter, zero-set timing, and reference conditioner. The
converter produces a digital angle
φ which tracks the analog
input angle
θ to within the specified accuracy of the converter.
The control transformer performs the following trigonometric
computation:
sin(
θ - φ) = sinθcosφ - cosθsinφ
Where :
θ is angle theta, representing the resolver shaft position.
φ is digital angle phi, contained in the up/down counter.
The tracking process consists of continually adjusting
φ to make
(
θ - φ) → 0, so that φ will repeat the shaft position θ. The output
of the demodulator is an analog DC level proportional to sin(
θ -
φ). The error processor receives its input from the demodulator
and integrates this sin(
θ - φ) error signal, which then drives the
VCO. The VCO’s clock pulses are accumulated by the up/down
counter. The velocity voltage accuracy, linearity and offset are
determined by the quality of the VCO. Functionally, the up/down
counter is an incremental integrator. Therefore, there are two
stages of integration, making the converter a Type II tracking
servo.
In a Type II servo, the VCO always settles to a counting rate
which makes d
φ/dt equal to dθ/dt without lag. The output data will
always be fresh and available as long as the maximum tracking
rate of the converter is not exceeded.
The reference conditioner is a comparator that produces the
square wave reference voltage which drives the demodulator. It
is single-ended ground based with an input Z of 100k ohms min,
110k ohms nominal, resistive.
MINIMIZING ERROR DUE TO QUADRATURE. In those appli-
cations where highest accuracy is needed, the reference (REF)
input can be phase-shifted by adding a capacitor in series with
the REF input (pin 40) to add a phase lead equal to the nominal
phase lead of the synchro input. To determine the capacitor’s
value, see FIGURE 3.
30
90
150
210
270
330
360
θ
(DEGREES)
CCW
In
Phase
with
REF
of
Converter
and
R2-R1
of
CX.
0
S1-S3 = V
SIN
θ
MAX
S3-S2 = V
SIN(
θ + 120°)
MAX
S2-S1 = V
SIN(
θ + 240°)
MAX
- V
MAX
+ V
MAX
TABLE 1. SDC-19204/6 SPECIFICATIONS (CONTINUED)
PARAMETER
VALUE
DESCRIPTION
POWER SUPPLY CHARACTERISTICS
Nominal Voltage and Range
Max Voltage w/o Damage
Max Current
+15 VDC ±5%
+18 V
25 mA
+5 VDC ±10%
+8 V
10 mA
-15 VDC ±5%
-18 V
15 mA
Note: When analog outputs
are not required ground
-15 V (pin 36).
TEMPERATURE RANGES
Operating
Storage
0° C to +70° C
-40° C to +120° C
PHYSICAL CHARACTERISTICS
Size
Weight
1.14 x 2.02 x 0.23 inches
(28.96 x 51.3 x 5.84 mm)
0.46 oz
(13gm)
40-pin TDIP
FIGURE 2. SYNCHRO SIGNALS
Standard Synchro Control Transmitter (CX) Outputs as a
Function of CCW Rotation From Electrical Zero (EZ).
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