GB688464A - Improvements relating to electrical controlling apparatus - Google Patents
Improvements relating to electrical controlling apparatusInfo
- Publication number
- GB688464A GB688464A GB1789349A GB1789349A GB688464A GB 688464 A GB688464 A GB 688464A GB 1789349 A GB1789349 A GB 1789349A GB 1789349 A GB1789349 A GB 1789349A GB 688464 A GB688464 A GB 688464A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coil
- valve
- current
- shunting
- controlled
- 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
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
- Electrolytic Production Of Metals (AREA)
- Materials For Photolithography (AREA)
Abstract
688,464. Automatic liquid level control systems. EVERSHED & VIGNOLES, Ltd., BOUNDY, J. R., and BERGEN, S. A. July 6, 1950 ]July 6, 1949], No. 17893/49. Class 38 (iv). In a liquid level control of the kind desclosed in Specification 688,462, the proportional band setting is adjustable by the inclusion of a variable gain amplifier. The amplifier comprises a valve 154, the grid voltage of which is controlled by a bridge consisting of photo-electric cells 162, 163, and the two halves of a resistor 170. The balance of the bridge (determined by the relative illumination of the cells) is controlled by a light shield 160 carried by a moving coil instrument having coils 150, 152. Under normal balanced conditions, the anode current of valve 154 flowing in coil 152 is equal to the error signal current in coil 150. The gain of the amplifier is controlled by adjustably shunting these coils by a potentiometer 181. Movement of the slider to the left increases the shunting of coil 152 and decreases the shunting of coil 150 thereby increasing the sensitivity of the system ; and vice versa. The signal current in coil 150 is derived from a floatcontrolled valve 7 together with integral and differential components derived from valve 122 in the manner disclosed in Specification 688,462. The correcting current in coil 152 also flows in the coil of a relay 38 controlling a reversible servomotor 39 correctively operating the drain valve V. The motor is stabilized by a followup connection back to the arm of the relay 38 via gearing 45, 46, and a spring 48. In order to set the zero position of a coil 108 (controlling the valve 122) a constant current of predetermined value is passed through it from a current control system. This includes in series with the supply from rectifier 193, a valve 190 and a coil 194 which operates contacts 195, 198, 199 to correctively control the grid voltage of the valve. Specification 688,516 also is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1789349A GB688464A (en) | 1949-07-06 | 1949-07-06 | Improvements relating to electrical controlling apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1789349A GB688464A (en) | 1949-07-06 | 1949-07-06 | Improvements relating to electrical controlling apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB688464A true GB688464A (en) | 1953-03-11 |
Family
ID=10103081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1789349A Expired GB688464A (en) | 1949-07-06 | 1949-07-06 | Improvements relating to electrical controlling apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB688464A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536167A (en) * | 2019-02-07 | 2020-08-14 | 现代自动车株式会社 | Clutch current control circuit and electric control valve with same |
-
1949
- 1949-07-06 GB GB1789349A patent/GB688464A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111536167A (en) * | 2019-02-07 | 2020-08-14 | 现代自动车株式会社 | Clutch current control circuit and electric control valve with same |
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