G05F

SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES regulating the timing or recurrence frequency of pulses in radar or radio navigation systems G01S; regulation of current or voltage, specially adapted for use in electronic time-pieces G04G19/02; closed-loop systems for regulating non-electric variables by electric means G05D; regulating power supply of digital computers G06F1/26; for obtaining desired operating characteristics of electromagnets with armatures H01F7/18; regulating electric power distribution networks H02J; regulating the charging of batteries H02J7/00; regulation of the output of static converters, e.g. switching regulators H02M; regulation of the output of electric generators H02N, H02P9/00; controlling transformers, reactors or choke coils H02P13/00; regulating frequency response, gain, maximum output, amplitude or bandwidth of amplifiers H03G; regulating tuning of resonant circuits H03J; regulating characteristics of transmission lines H04B; controlling electric light sources H05B39/04, H05B41/36, H05B45/10, H05B45/20, H05B47/10; electric control of X-ray apparatus H05G1/30

This subclass covers:

systems only;

use of hydraulic, pneumatic, mechanical, and electrical motors for varying electric characteristics of devices which restore the quantity regulated;

the combination of static converters and current or voltage regulators, if the invention resides in the combination.

This subclass does not cover elements per se, which are covered by the relevant subclasses.

The following IPC groups are not in the CPC scheme. The subject matter for these IPC groups is classified in the following CPC groups:

G05F3/28

covered by

G05F3/26

G05F5/02

covered by

G05F5/00

G05F5/04

covered by

G05F5/00

G05F5/06

covered by

G05F5/00

G05F5/08

covered by

G05F5/00

In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.

G05F1/00

Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems

G05F1/02

Regulating electric characteristics of arcs arrangements for feeding electrodes B23K9/12, H05B7/109, H05B31/18; automatic control of power for heating by discharge H05B7/148

G05F1/04

by means of saturable magnetic devices

G05F1/06

by means of discharge tubes

G05F1/08

by means of semiconductor devices

G05F1/10

Regulating voltage or current G05F1/02 takes precedence; for electric railways B60M3/02

G05F1/12

wherein the variable actually regulated by the final control device is ac G05F1/625 takes precedence

G05F1/13

using ferroresonant transformers as final control devices

G05F1/14

using tap transformers or tap changing inductors as final control devices

G05F1/147

with motor driven tap switch

G05F1/153

controlled by discharge tubes or semiconductor devices

G05F1/16

combined with discharge tubes or semiconductor devices

G05F1/20

semiconductor devices only

G05F1/22

combined with separate magnetic control devices having a controllable degree of saturation

G05F1/24

using bucking or boosting transformers as final control devices

G05F1/247

with motor in control circuit

G05F1/253

the transformers including plural windings in series between source and load G05F1/247 takes precedence

G05F1/26

combined with discharge tubes or semiconductor devices

G05F1/30

semiconductor devices only

G05F1/32

using magnetic devices having a controllable degree of saturation as final control devices

G05F1/325

with specific core structure, e.g. gap, aperture, slot, permanent magnet

G05F1/33

with plural windings through which current to be controlled is conducted

G05F1/335

on different cores

G05F1/34

combined with discharge tubes or semiconductor devices

G05F1/38

semiconductor devices only

G05F1/40

using discharge tubes or semiconductor devices as final control devices

G05F1/42

discharge tubes only

G05F1/44

semiconductor devices only

G05F1/445

being transistors in series with the load

G05F1/45

being controlled rectifiers in series with the load

G05F1/452

with pulse-burst modulation control

G05F1/455

with phase control

G05F1/46

wherein the variable actually regulated by the final control device is dc G05F1/625 takes precedence

G05F1/461

using an operational amplifier as final control device

G05F1/462

as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic

G05F1/463

Sources providing an output which depends on temperature

G05F1/465

Internal voltage generators for integrated circuits, e.g. step down generators

G05F1/466

Sources with reduced influence on propagation delay

G05F1/467

Sources with noise compensation

G05F1/468

characterised by reference voltage circuitry, e.g. soft start, remote shutdown

G05F1/52

using discharge tubes in series with the load as final control devices

G05F1/54

additionally controlled by the unregulated supply

G05F1/56

using semiconductor devices in series with the load as final control devices G05F1/461 takes precedence

G05F1/561

Voltage to current converters amplifiers H03F

G05F1/562

with a threshold detection shunting the control path of the final control device

G05F1/563

including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation

G05F1/565

sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor G05F1/563 takes precedence

G05F1/567

for temperature compensation

G05F1/569

for protection

G05F1/571

with overvoltage detector

G05F1/573

with overcurrent detector

G05F1/5735

with foldback current limiting

G05F1/575

characterised by the feedback circuit

G05F1/577

for plural loads

G05F1/585

providing voltages of opposite polarities

G05F1/59

including plural semiconductor devices as final control devices for a single load

G05F1/595

semiconductor devices connected in series

G05F1/607

using discharge tubes in parallel with the load as final control devices

G05F1/61

including two stages of regulation, at least one of which is output level responsive

G05F1/613

using semiconductor devices in parallel with the load as final control devices G05F1/461 takes precedence

G05F1/614

including two stages of regulation, at least one of which is output level responsive

G05F1/618

using semiconductor devices in series and in parallel with the load as final control devices G05F1/461 takes precedence

G05F1/62

using bucking or boosting dc sources

G05F1/625

wherein it is irrelevant whether the variable actually regulated is ac or dc

G05F1/63

using variable impedances in series with the load as final control devices

G05F1/635

being Hall effect devices, magnetoresistors or thermistors

G05F1/644

being pressure-sensitive resistors

G05F1/648

being plural resistors among which a selection is made

G05F1/652

using variable impedances in parallel with the load as final control devices

G05F1/656

using variable impedances in series and in parallel with the load as final control devices

G05F1/66

Regulating electric power

G05F1/67

to the maximum power available from a generator, e.g. from solar cell

G05F1/70

Regulating power factor

Regulating reactive current or power

G05F3/00

Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties

current generators specially designed for use in phase-locked loops H03L7/0891

G05F3/02

Regulating voltage or current

G05F3/04

wherein the variable is ac

G05F3/06

using combinations of saturated and unsaturated inductive devices, e.g. combined with resonant circuit

G05F3/08

wherein the variable is dc

G05F3/10

using uncontrolled devices with non-linear characteristics

G05F3/12

being glow discharge tubes

G05F3/16

being semiconductor devices

G05F3/18

using Zener diodes

G05F3/185

and field-effect transistors

G05F3/20

using diode- transistor combinations G05F3/18 takes precedence

G05F3/205

Substrate bias-voltage generators for static stores G11C5/146

G05F3/22

wherein the transistors are of the bipolar type only G05F3/26, G05F3/30 take precedence

G05F3/222

with compensation for device parameters, e.g. Early effect, gain, manufacturing process, or external variations, e.g. temperature, loading, supply voltage

G05F3/225

producing a current or voltage as a predetermined function of the temperature

G05F3/227

producing a current or voltage as a predetermined function of the supply voltage

G05F3/24

wherein the transistors are of the field-effect type only G05F3/205, G05F3/26, G05F3/30 take precedence

G05F3/242

with compensation for device parameters, e.g. channel width modulation, threshold voltage, processing, or external variations, e.g. temperature, loading, supply voltage

G05F3/245

producing a voltage or current as a predetermined function of the temperature

G05F3/247

producing a voltage or current as a predetermined function of the supply voltage

G05F3/26

Current mirrors

G05F3/262

using field-effect transistors only

G05F3/265

using bipolar transistors only

G05F3/267

using both bipolar and field-effect technology

G05F3/30

Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities G05F3/26 takes precedence

G05F5/00

Systems for regulating electric variables by detecting deviations in the electric input to the system and thereby controlling a device within the system to obtain a regulated output

G05F7/00

Regulating magnetic variables details of apparatus for measuring magnetic variables involving magnetic resonance G01R33/28