| Patents for G05F 1 - 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 (37,749) |
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| 05/03/1989 | CN1004111B Power factor calibration system working in accordance with counting and cycling mode |
| 05/03/1989 | CN1004108B Automatic control devices for generating station |
| 05/02/1989 | US4827392 Control apparatus for a power converter |
| 05/02/1989 | US4827205 On-chip voltage supply regulator |
| 04/27/1989 | DE3733889A1 Series regulator |
| 04/26/1989 | EP0313366A2 Variable speed constant frequency power system with boost converter auxiliary output |
| 04/26/1989 | EP0312686A2 Energy controller |
| 04/26/1989 | CN2036711U High-efficiency power factor automatic compensation controller |
| 04/26/1989 | CN2036681U Voltage stabilized ac power supply |
| 04/25/1989 | US4825333 Drive circuit |
| 04/25/1989 | US4825141 DC power supply device |
| 04/25/1989 | US4825140 Power tool/vacumm cleaner power control |
| 04/25/1989 | CA1253203A1 Phase shifter |
| 04/20/1989 | WO1989003608A1 Process and device for preventing interference of transients in a buck cell |
| 04/19/1989 | EP0311995A2 Power saving circuitry |
| 04/19/1989 | CN2036327U Non-compensation condenser automatic on and off device |
| 04/12/1989 | EP0311576A2 Active overvoltage control for inductive load driving |
| 04/12/1989 | EP0311236A2 LCD compensation for non-optimum voltage conditions |
| 04/11/1989 | US4820023 Voltage adjusting apparatus |
| 04/11/1989 | CA1252533A1 Bi-directional multi-frequency ripple control system |
| 04/05/1989 | EP0310502A1 Control of electric resistances, especially those for an industrial oven |
| 04/05/1989 | EP0309922A2 Circuit for briefly boosting a regulated power voltage when switching on or in case of a drop in voltage |
| 04/05/1989 | EP0309482A1 Method and apparatus for improving electrochemical processes |
| 04/05/1989 | CN2035505U Anti-jamming numeric control ac regulated power supply |
| 04/04/1989 | US4819179 Digital slip frequency generator and method for determining the desired slip frequency |
| 04/04/1989 | US4819145 Direct current power unit |
| 04/04/1989 | US4819121 Security apparatus for power converter |
| 04/04/1989 | US4818836 Power supply for a three-phase plasma heating unit |
| 03/29/1989 | EP0309365A1 Adjustable current source and automatic calibration digital/analog converter using such a source |
| 03/28/1989 | US4817063 Power source control circuit for an analog electronic timepiece |
| 03/28/1989 | US4817045 Monitored control arrangement |
| 03/28/1989 | US4816741 Switched resistor regulator with diode-snubber for parasitic inductance in switched resistor |
| 03/28/1989 | US4816740 Mode optimized D.C. power supply |
| 03/28/1989 | US4816738 Tap changing power regulator for airport lighting |
| 03/23/1989 | DE3815526C1 Circuit arrangement for a power output stage |
| 03/22/1989 | EP0308260A2 Energy transfer arrangement |
| 03/22/1989 | CN2034711U Alternative voltage-stabilizer |
| 03/21/1989 | US4814966 Shunt switched resistor regulator with diode snubber |
| 03/21/1989 | US4814688 Reference generator |
| 03/21/1989 | US4814687 Following voltage/current regulator |
| 03/21/1989 | US4814640 Electrically trimmable semiconductor device |
| 03/15/1989 | CN2034344U Universal automatic controller for power factor of medium and power frequency |
| 03/15/1989 | CN2034303U Auto-protection dc regulated power supply |
| 03/15/1989 | CN2034302U Series inversion compensation type electronic ac voltage regulator |
| 03/14/1989 | US4812737 Voltage regulator for solar cell arrays |
| 03/14/1989 | US4812733 Computer element performance enhancer |
| 03/14/1989 | US4812669 Harmonic suppressing device |
| 03/14/1989 | CA1251258A1 Ferroresonant constant ac voltage regulator |
| 03/09/1989 | DE3729000A1 Universal regulator for maximising the power of photovoltaic electrical power supplies and for high-efficiency DC/DC voltage converters |
| 03/08/1989 | EP0138823B1 A current source circuit having reduced error |
| 03/08/1989 | CN2033919U Phase inversion type a.c. voltage regulator |
| 03/07/1989 | US4811187 DC-DC converter with saturable reactor reset circuit |
| 03/07/1989 | US4811010 Monitor system for traffic-lights |
| 03/07/1989 | US4810952 Circuitry and method for controlling power to fastener machine solenoid |
| 03/07/1989 | US4810948 Constant-voltage regulated power supply circuit |
| 03/02/1989 | DE3727572A1 Voltage supply unit |
| 03/02/1989 | DE3727478A1 Power supply unit having a switched, saturated inductor |
| 03/01/1989 | CN2033557U Current-limiting, overcurrent, overvoltage protector of regulated power supply |
| 03/01/1989 | CN2033525U Dual-loop series a.c. voltage-regulator of a thyratron transistor |
| 03/01/1989 | CN1031433A Microprosessor control of automatical regulator for electrodes in arc furnace |
| 02/28/1989 | US4808914 Resistance measuring ohms converter circuit employing a constant current source |
| 02/28/1989 | US4808907 Current regulator and method |
| 02/28/1989 | US4808905 Current-limiting circuit |
| 02/23/1989 | DE3727122A1 Method and arrangement for adjusting (balancing) a current controller |
| 02/23/1989 | DE3727026A1 Circuit arrangement for supplying an electrical load from a solar generator |
| 02/23/1989 | DE3727025A1 Circuit arrangement for supplying an electrical load from a solar generator |
| 02/22/1989 | EP0304363A1 Power regulator, in particular for airport lighting |
| 02/22/1989 | CN2033135U Device reducing current source load potential drop for laboratory |
| 02/21/1989 | US4806844 Circuit for providing on-chip DC power supply in an integrated circuit |
| 02/21/1989 | US4806788 Semiconductor integrated circuit with decreased burn-in time |
| 02/15/1989 | EP0303314A2 Method for power control of electric loads without commutation pulse |
| 02/15/1989 | EP0303289A2 D.C. power monitor |
| 02/15/1989 | CN2032783U Controller for measuring position and arc length of double-electrode |
| 02/15/1989 | CN2032740U Ac voltage stabilizer |
| 02/15/1989 | CN2032739U 晶体管电压调节器 Transistor voltage regulator |
| 02/14/1989 | US4804923 Voltage control system |
| 02/09/1989 | WO1989001256A1 Electric power supply device with regulated alternating-current voltage output |
| 02/09/1989 | WO1989001200A1 Circuit with compensated internal impedance |
| 02/09/1989 | DE3725476A1 Load supply circuit from power source of variable output - has changeover switch coupled to power source for selective coupling of pre-load or auxiliary feed voltage input |
| 02/09/1989 | DE3725009A1 Serial voltage controller |
| 02/08/1989 | CN2032341U Series voltage-stabilized-source provided with controlled silicon |
| 02/08/1989 | CN2032340U Full automatic ac voltage regulator |
| 02/07/1989 | US4803612 Clock ripple reduction in a linear low dropout C/DMOS regulator |
| 02/07/1989 | US4803592 Power control and fault isolation indicator |
| 02/07/1989 | US4803440 Automatic electrical power control circuit |
| 02/07/1989 | US4803379 Circuit arrangement for power supply for electrical and electronic control or regulating devices |
| 02/07/1989 | US4803331 Power control and line voltage monitor/compensator for resistance spot welding machines |
| 02/01/1989 | EP0301483A2 Control apparatus for a power converter |
| 02/01/1989 | EP0301284A2 Voltage source circuit arrangement with predetermined values of the source voltage and the internal resistances |
| 01/31/1989 | US4801860 Voltage stabilizer with a minimal voltage drop designed to withstand high voltage transients |
| 01/25/1989 | EP0300343A2 Active filter unit |
| 01/25/1989 | EP0300091A2 Multiple time delay power controller apparatus with time delay turn-on and turn-off |
| 01/24/1989 | US4800586 Compensation circuit for use with an integrating amplifier |
| 01/24/1989 | US4800331 Linear current limiter with temperature shutdown |
| 01/24/1989 | US4800330 AC power control |
| 01/24/1989 | US4799769 Liquid crystal antidazzle mirror |
| 01/24/1989 | CA1249327A1 Digital light control |
| 01/18/1989 | EP0299292A2 Longitudinal voltage regulator with reduced output reverse current |
| 01/18/1989 | CN2031122U Modified relay type ac voltage stabilizer |
| 01/10/1989 | US4797608 D.C. power monitor |