1. CPC Sections
  2. CPC Section G
  3. CPC Class G05
  4. CPC Subclass G05F
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Version: 2025.01
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CPC
COOPERATIVE PATENT CLASSIFICATION
​​
G05F
SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES [2025-01]
NOTES

  • 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.
WARNINGS

  • 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 G05F 3/26
    G05F5/02 covered by G05F 5/00
    G05F5/04 covered by G05F 5/00
    G05F5/06 covered by G05F 5/00
    G05F5/08 covered by G05F 5/00
  • 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.
G05F 1/00
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 [2013-01]
G05F 1/02
.
Regulating electric characteristics of arcs [2025-01]
G05F 1/04
. .
by means of saturable magnetic devices [2013-01]
G05F 1/06
. .
by means of discharge tubes [2013-01]
G05F 1/08
. .
by means of semiconductor devices [2013-01]
G05F 1/10
.
Regulating voltage or current  (G05F 1/02 takes precedence) [2025-01]
G05F 1/12
. .
wherein the variable actually regulated by the final control device is AC (G05F 1/625 takes precedence) [2025-01]
G05F 1/13
. . .
using ferroresonant transformers as final control devices [2017-08]
G05F 1/14
. . .
using tap transformers or tap changing inductors as final control devices [2017-08]
G05F 1/147
. . . .
with motor driven tap switch [2013-01]
G05F 1/153
. . . . .
controlled by discharge tubes or semiconductor devices [2013-01]
G05F 1/16
. . . .
combined with discharge tubes or semiconductor devices [2013-01]
G05F 1/20
. . . . .
semiconductor devices only [2013-01]
G05F 1/22
. . . .
combined with separate magnetic control devices having a controllable degree of saturation [2013-01]
G05F 1/24
. . .
using bucking or boosting transformers as final control devices [2013-01]
G05F 1/247
. . . .
with motor in control circuit [2013-01]
G05F 1/253
. . . .
the transformers including plural windings in series between source and load (G05F 1/247 takes precedence) [2013-01]
G05F 1/26
. . . .
combined with discharge tubes or semiconductor devices [2013-01]
G05F 1/30
. . . . .
semiconductor devices only [2013-01]
G05F 1/32
. . .
using magnetic devices having a controllable degree of saturation as final control devices [2013-01]
G05F 1/325
. . . .
with specific core structure, e.g. gap, aperture, slot, permanent magnet [2013-01]
G05F 1/33
. . . .
with plural windings through which current to be controlled is conducted [2013-01]
G05F 1/335
. . . . .
on different cores [2013-01]
G05F 1/34
. . . .
combined with discharge tubes or semiconductor devices [2013-01]
G05F 1/38
. . . . .
semiconductor devices only [2013-01]
G05F 1/40
. . .
using discharge tubes or semiconductor devices as final control devices [2013-01]
G05F 1/42
. . . .
discharge tubes only [2013-01]
G05F 1/44
. . . .
semiconductor devices only [2013-01]
G05F 1/445
. . . . .
being transistors in series with the load [2013-01]
G05F 1/45
. . . . .
being controlled rectifiers in series with the load [2013-01]
G05F 1/452
. . . . . .
{with pulse-burst modulation control} [2013-01]
G05F 1/455
. . . . . .
with phase control [2013-01]
G05F 1/46
. .
wherein the variable actually regulated by the final control device is DC (G05F 1/625 takes precedence) [2025-01]
G05F 1/461
. . .
{using an operational amplifier as final control device} [2013-01]
G05F 1/462
. . .
{as a function of the requirements of the load, e.g. delay, temperature, specific voltage/current characteristic} [2013-01]
G05F 1/463
. . . .
{Sources providing an output which depends on temperature} [2013-01]
G05F 1/465
. . . .
{Internal voltage generators for integrated circuits, e.g. step down generators} [2013-01]
G05F 1/466
. . . .
{Sources with reduced influence on propagation delay} [2013-01]
G05F 1/467
. . . .
{Sources with noise compensation} [2013-01]
G05F 1/468
. . .
{characterised by reference voltage circuitry, e.g. soft start, remote shutdown} [2013-01]
G05F 1/52
. . .
using discharge tubes in series with the load as final control devices [2013-01]
G05F 1/54
. . . .
additionally controlled by the unregulated supply [2013-01]
G05F 1/56
. . .
using semiconductor devices in series with the load as final control devices (G05F 1/461 takes precedence) [2013-01]
G05F 1/561
. . . .
{Voltage to current converters (amplifiers H03F)} [2013-01]
G05F 1/562
. . . .
{with a threshold detection shunting the control path of the final control device} [2013-01]
G05F 1/563
. . . .
including two stages of regulation at least one of which is output level responsive, e.g. coarse and fine regulation [2013-01]
G05F 1/565
. . . .
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 (G05F 1/563 takes precedence) [2013-01]
G05F 1/567
. . . . .
for temperature compensation [2013-01]
G05F 1/569
. . . . .
for protection [2013-01]
G05F 1/571
. . . . . .
with overvoltage detector [2013-01]
G05F 1/573
. . . . . .
with overcurrent detector [2013-01]
G05F 1/5735
. . . . . . .
{with foldback current limiting} [2013-01]
G05F 1/575
. . . .
characterised by the feedback circuit [2013-01]
G05F 1/577
. . . .
for plural loads [2013-01]
G05F 1/585
. . . . .
providing voltages of opposite polarities [2013-01]
G05F 1/59
. . . .
including plural semiconductor devices as final control devices for a single load [2013-01]
G05F 1/595
. . . . .
semiconductor devices connected in series [2013-01]
G05F 1/607
. . .
using discharge tubes in parallel with the load as final control devices [2013-01]
G05F 1/61
. . . .
including two stages of regulation, at least one of which is output level responsive [2013-01]
G05F 1/613
. . .
using semiconductor devices in parallel with the load as final control devices (G05F 1/461 takes precedence) [2013-01]
G05F 1/614
. . . .
including two stages of regulation, at least one of which is output level responsive [2013-01]
G05F 1/618
. . .
using semiconductor devices in series and in parallel with the load as final control devices (G05F 1/461 takes precedence) [2013-01]
G05F 1/62
. . .
using bucking or boosting DC sources [2025-01]
G05F 1/625
. .
wherein it is irrelevant whether the variable actually regulated is AC or DC [2025-01]
G05F 1/63
. . .
using variable impedances in series with the load as final control devices [2013-01]
G05F 1/635
. . . .
being Hall effect devices, magnetoresistors or thermistors [2013-01]
G05F 1/644
. . . .
being pressure-sensitive resistors [2013-01]
G05F 1/648
. . . .
being plural resistors among which a selection is made [2013-01]
G05F 1/652
. . .
using variable impedances in parallel with the load as final control devices [2013-01]
G05F 1/656
. . .
using variable impedances in series and in parallel with the load as final control devices [2013-01]
G05F 1/66
.
Regulating electric power [2013-01]
G05F 1/67
. .
to the maximum power available from a generator, e.g. from solar cell [2013-01]
G05F 1/70
.
Regulating power factor; Regulating reactive current or power [2013-01]
G05F 3/00
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 H03L 7/0891)} [2013-01]
G05F 3/02
.
Regulating voltage or current [2013-01]
G05F 3/04
. .
wherein the variable is AC [2025-01]
G05F 3/06
. . .
using combinations of saturated and unsaturated inductive devices, e.g. combined with resonant circuit [2013-01]
G05F 3/08
. .
wherein the variable is DC [2025-01]
G05F 3/10
. . .
using uncontrolled devices with non-linear characteristics [2013-01]
G05F 3/12
. . . .
being glow discharge tubes [2013-01]
G05F 3/16
. . . .
being semiconductor devices [2013-01]
G05F 3/18
. . . . .
using Zener diodes [2013-01]
G05F 3/185
. . . . . .
{and field-effect transistors} [2013-01]
G05F 3/20
. . . . .
using diode- transistor combinations (G05F 3/18 takes precedence) [2013-01]
G05F 3/205
. . . . . .
{Substrate bias-voltage generators (for static stores G11C 5/146)} [2013-01]
G05F 3/22
. . . . . .
wherein the transistors are of the bipolar type only (G05F 3/26, G05F 3/30 take precedence) [2013-01]
G05F 3/222
. . . . . . .
{with compensation for device parameters, e.g. Early effect, gain, manufacturing process, or external variations, e.g. temperature, loading, supply voltage} [2013-01]
G05F 3/225
. . . . . . . .
{producing a current or voltage as a predetermined function of the temperature} [2013-01]
G05F 3/227
. . . . . . . .
{producing a current or voltage as a predetermined function of the supply voltage} [2013-01]
G05F 3/24
. . . . . .
wherein the transistors are of the field-effect type only (G05F 3/205, G05F 3/26, G05F 3/30 take precedence) [2013-01]
G05F 3/242
. . . . . . .
{with compensation for device parameters, e.g. channel width modulation, threshold voltage, processing, or external variations, e.g. temperature, loading, supply voltage} [2013-01]
G05F 3/245
. . . . . . . .
{producing a voltage or current as a predetermined function of the temperature} [2013-01]
G05F 3/247
. . . . . . . .
{producing a voltage or current as a predetermined function of the supply voltage} [2013-01]
G05F 3/26
. . . . . .
Current mirrors [2013-01]
G05F 3/262
. . . . . . .
{using field-effect transistors only} [2013-01]
G05F 3/265
. . . . . . .
{using bipolar transistors only} [2013-01]
G05F 3/267
. . . . . . .
{using both bipolar and field-effect technology} [2013-01]
G05F 3/30
. . . . . .
Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities (G05F 3/26 takes precedence) [2013-01]
G05F 5/00
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 [2013-01]
G05F 7/00
Regulating magnetic variables [2025-01]