GB1199361A - Improvements in or relating to Digital Phase Comparators - Google Patents
Improvements in or relating to Digital Phase ComparatorsInfo
- Publication number
- GB1199361A GB1199361A GB12348/68A GB1234868A GB1199361A GB 1199361 A GB1199361 A GB 1199361A GB 12348/68 A GB12348/68 A GB 12348/68A GB 1234868 A GB1234868 A GB 1234868A GB 1199361 A GB1199361 A GB 1199361A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stable
- transistors
- pulses
- input
- phase comparators
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R25/00—Arrangements for measuring phase angle between a voltage and a current or between voltages or currents
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/18—Controlling the angular speed together with angular position or phase
- H02P23/186—Controlling the angular speed together with angular position or phase of one shaft by controlling the prime mover
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
1,199,361. Frequency and phase comparators. AMPEX CORP. 14 March, 1968 [30 March, 1967], No. 12348/68. Heading H3A. [Also in Division G3] A phase comparator for comparing a square wave, e.g. from a tachometer, with a reference square wave, comprises three bi-stable circuits (Fig. 2, not shown) connected as a shift register which is advanced in one direction by one input and in the opposite direction by the other input. The output is taken from the middle bi-stable and comprises a sequence of " one " pulses if the frequency error is in one direction or of " zero " pulses if the error is in the other direction. Bi-stable circuits. Fig. 3. Transistors 25-27 are cross-coupled to transistors 30-32 to form a bi-stable circuit which can be switched by simultaneous input pulses applied to transistor 20 or to transistor 21 which form AND gate inputs coupled by respective transistors 28 and 33 to the bi-stable circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US62699767A | 1967-03-30 | 1967-03-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1199361A true GB1199361A (en) | 1970-07-22 |
Family
ID=24512746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12348/68A Expired GB1199361A (en) | 1967-03-30 | 1968-03-14 | Improvements in or relating to Digital Phase Comparators |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1763063A1 (en) |
| FR (1) | FR1557343A (en) |
| GB (1) | GB1199361A (en) |
| NL (1) | NL6804439A (en) |
-
1968
- 1968-03-14 GB GB12348/68A patent/GB1199361A/en not_active Expired
- 1968-03-18 FR FR1557343D patent/FR1557343A/fr not_active Expired
- 1968-03-29 NL NL6804439A patent/NL6804439A/xx unknown
- 1968-03-29 DE DE19681763063 patent/DE1763063A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| NL6804439A (en) | 1968-10-01 |
| DE1763063A1 (en) | 1971-07-01 |
| FR1557343A (en) | 1969-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PE20 | Patent expired after termination of 20 years |