AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES (of dynamo-electric generators H 02 P) [3]
Notes
(1)
This subclass covers:
-
automatic control circuits for generators of electronic oscillations or pulses; [3]
-
starting, synchronisation, or stabilisation circuits for generators where the type of generator is irrelevant or unspecified. [3]
(2)
This subclass does not cover stabilisation or starting circuits specially adapted to only one specific type of generator, which are covered by subclasses H 03 B, H 03 K. [3]
(3)
In this subclass, the following expression is used with the meaning indicated:
-
"automatic control" covers only closed loop systems. [3]
1
/
00
Stabilisation of generator output against variations of physical values, e.g. power supply (automatic control H 03 L 5/00, H 03 L 7/00) [3]
1
/
02
•
against variations of temperature only [3]
1
/
04
•
•
Constructional details for maintaining temperature constant [3]
3
/
00
Starting of generators [3]
5
/
00
Automatic control of voltage, current, or power [3]
5
/
02
•
of power [3]
7
/
00
Automatic control of frequency or phase; Synchronisation (tuning of resonant circuits in general H 03 J; synchronising in digital communication systems, see the relevant groups in class H 04) [3]
7
/
02
•
using a frequency discriminator comprising a passive frequency-determining element [3]
7
/
04
•
•
wherein the frequency-determining element comprises distributed inductance and capacitance [3]
7
/
06
•
using a reference signal applied to a frequency- or phase-locked loop [3]
7
/
07
•
•
using several loops, e.g. for redundant clock signal generation (for indirect frequency synthesis H 03 L 7/22) [5]
7
/
08
•
•
Details of the phase-locked loop [3]
7
/
081
•
•
•
provided with an additional controlled phase shifter [5]
7
/
083
•
•
•
the reference signal being additionally directly applied to the generator (direct frequency synchronisation without loop H 03 L 7/24) [5]
7
/
085
•
•
•
concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal (H 03 L 7/10 takes precedence; frequency or phase detection comparison in general H 03 D 3/00, H 03 D 13/00) [5]
7
/
087
•
•
•
•
using at least two phase detectors or a frequency and phase detector in the loop [5]
7
/
089
•
•
•
•
the phase or frequency detector generating up-down pulses (H 03 L 7/087 takes precedence) [5]
7
/
091
•
•
•
•
the phase or frequency detector using a sampling device (H 03 L 7/087 takes precedence) [5]
7
/
093
•
•
•
•
using special filtering or amplification characteristics in the loop (H 03 L 7/087 to H 03 L 7/091 take precedence) [5]
7
/
095
•
•
•
•
using a lock detector (H 03 L 7/087 takes precedence) [5]
7
/
097
•
•
•
•
using a comparator for comparing the voltages obtained from two frequency to voltage converters [5]
7
/
099
•
•
•
concerning mainly the controlled oscillator of the loop [5]
7
/
10
•
•
•
for assuring initial synchronisation or for broadening the capture range [3]
7
/
107
•
•
•
•
using a variable transfer function for the loop, e.g. low pass filter having a variable bandwidth [5]
7
/
113
•
•
•
•
using frequency discriminator [5]
7
/
12
•
•
•
•
using a scanning signal (tuning circuits with automatic scanning over a band of frequencies H 03 J 7/18) [3]
7
/
14
•
•
•
for assuring constant frequency when supply or correction voltages fail [3]
7
/
16
•
•
Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop [3]
7
/
18
•
•
•
using a frequency divider or counter in the loop (H 03 L 7/20
, H 03 L 7/22 take precedence) [3]
7
/
181
•
•
•
•
a numerical count result being used for locking the loop, the counter counting during fixed time intervals [5]
7
/
183
•
•
•
•
a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number [5]
using means for coarse tuning the voltage controlled oscillator of the loop (H 03 L 7/191 to H 03 L 7/195 take precedence) [5]
7
/
189
•
•
•
•
•
•
comprising a D/A converter for generating a coarse tuning voltage [5]
7
/
191
•
•
•
•
•
using at least two different signals from the frequency divider or the counter for determining the time difference (H 03 L 7/193, H 03 L 7/195 take precedence) [5]
7
/
193
•
•
•
•
•
the frequency divider/counter comprising a commutable pre-divider, e.g. a two modulus divider (pulse counters/frequency dividers H 03 K 21/00 to H 03 K 29/00) [5]
7
/
195
•
•
•
•
•
in which the counter of the loop counts between two different non zero numbers, e.g. for generating an offset frequency (H 03 L 7/193 takes precedence; pulse counters for predetermined counting H 03 K 21/00 to H 03 K 29/00) [5]
7
/
197
•
•
•
•
a time difference being used for locking the loop, the counter counting between numbers which are variable in time or the frequency divider dividing by a factor variable in time, e.g. for obtaining fractional frequency division [5]
7
/
199
•
•
•
•
•
with reset of the frequency divider or the counter, e.g. for assuring initial synchronisation [5]
7
/
20
•
•
•
using a harmonic phase-locked loop, i.e. a loop which can be locked to one of a number of harmonically related frequencies applied to it (H 03 L 7/22 takes precedence) [3]
7
/
22
•
•
•
using more than one loop [3]
7
/
23
•
•
•
•
with pulse counters or frequency dividers [5]
7
/
24
•
using a reference signal directly applied to the generator [3]
7
/
26
•
using energy levels of molecules, atoms, or subatomic particles as a frequency reference [3]
