| Patents for H02H 7 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions (32,726) |
|---|
| 04/25/1990 | CN1007771B Distance relay measured by variable of operating frequency |
| 04/24/1990 | US4920447 Method for protecting the gate unit for a GTO thyristor |
| 04/24/1990 | CA1268220A1 Voltage sensitive switch |
| 04/24/1990 | CA1268055A1 Centrifuge overspeed protection and imbalance detection system |
| 04/18/1990 | CN2056290U Phase-lack protector for motor |
| 04/18/1990 | CN2056289U Protector against phase interruption for general-purpose motor |
| 04/18/1990 | CN2056287U Supersensitive capacitor phase-lack protector |
| 04/17/1990 | US4918592 Power regulating system for portable engine generator |
| 04/17/1990 | CA1267966A1 Active pilot wire apparatus for electromechanical current differential relays |
| 04/11/1990 | EP0362496A2 Control circuit for a universal motor |
| 04/11/1990 | EP0362495A2 Electrical control circuit for a universal motor |
| 04/11/1990 | CN2055996U Motor starting resistance protector of air compressor |
| 04/10/1990 | US4916569 Short circuit protection for switch mode power supply |
| 04/10/1990 | US4916402 Apparatus for detecting direct current magnetic flux deflections of an electrical transformer |
| 04/10/1990 | US4915162 Method and apparatus for heater current control for automatic vending machine |
| 04/10/1990 | EP0277961A4 Capacitor circuit interruption. |
| 04/10/1990 | CA1267718A1 Transformer differential relay with speed-up apparatus |
| 04/10/1990 | CA1267710A1 Pump control apparatus and method |
| 04/04/1990 | EP0361725A1 Motorized power steering apparatus |
| 04/04/1990 | EP0361174A1 Protection method and device for the detection of an asynchronism in the frequency start of a synchronous machine |
| 04/04/1990 | CN2055649U Protector for loss of phase of electric machine |
| 04/04/1990 | CN1007488B Regulator fault protection circuit |
| 04/04/1990 | CN1007484B Method of protecting motor from overload according to the ageloss |
| 04/03/1990 | US4914560 Protection circuit for switching mode power supply circuit |
| 04/03/1990 | US4914386 Method and apparatus for providing thermal protection for large motors based on accurate calculations of slip dependent rotor resistance |
| 04/03/1990 | US4914316 Circuit for holding a MOS transistor in a conduction state in a voltage supply outage situation |
| 04/03/1990 | US4912938 DC voltage bleeder for a variable speed air conditioner |
| 03/29/1990 | DE3932272A1 Einrichtung zur steuerung und regelung der drehgeschwindigkeit eines gleichstrom-elektromotors, insbesondere fuer ein elektrisches geblaese einer klimaanlage eines kraftfahrzeugs Means for control and regulation of the rotating speed of a dc electric motors, in particular for an electric fan an air conditioner of a motor vehicle |
| 03/29/1990 | DE3929185A1 Polarity reversal protection system for battery - uses electronic component or integrated circuit providing reverse voltage protection for each individual battery cell |
| 03/28/1990 | EP0221972B1 Protection circuit for an inverter |
| 03/28/1990 | CN1007392B Bus differential relay |
| 03/27/1990 | US4912588 High-tension voltage generator and method of protecting same against electrical arcs |
| 03/27/1990 | US4912447 Transformer with channels in bobbin |
| 03/22/1990 | WO1990003038A1 Superconductive magnet device |
| 03/22/1990 | WO1990002670A1 Electrical supply control system for a motor vehicle |
| 03/21/1990 | CN1040717A Combined multifunctional efficient electronic transformer |
| 03/21/1990 | CN1007309B Transformer differential relay with speed-up apparatus |
| 03/21/1990 | CN1007308B Direct transeer trip apparatus for use with an active pilot wire communications channel |
| 03/21/1990 | CN1007307B Active pilot were apparatus for electromecanical current differential relays |
| 03/14/1990 | EP0358488A2 Equipment for and methods of locating the position of a fault on a power transmission line |
| 03/14/1990 | EP0358149A2 Load drive circuits |
| 03/14/1990 | CN2054583U Multi-functional protector for alternating-current motor |
| 03/14/1990 | CN2054567U Non-noise micro-power loss alternating current contactor |
| 03/13/1990 | US4908755 Method and circuit for limiting the output current of a flyback converter |
| 03/13/1990 | US4908595 Motor protector |
| 03/07/1990 | CN2054224U Phase interruption protector for multiple motors |
| 03/07/1990 | CN1007107B Electronic protecting instrument for ac load |
| 03/06/1990 | US4907116 Power supply fault protection circuit |
| 03/06/1990 | CA1266511A1 Apparatus for detecting degradation of an arrester |
| 02/28/1990 | CN2053811U Multifunction fully-automatic protective switch of three-phase motor |
| 02/28/1990 | CN2053810U Magnetism, erasing device |
| 02/27/1990 | US4904945 Apparatus and process for detecting direct current magnetic flux deflections in an electrical transformer employing Fourier analysis |
| 02/27/1990 | CA1266298A1 Zener diode looping element for protecting a battery cell |
| 02/21/1990 | EP0243412A4 Intertripping system. |
| 02/20/1990 | US4903160 Sudden, pressure relay supervisory apparatus |
| 02/20/1990 | US4902956 Safety device to prevent excessive battery drain |
| 02/20/1990 | CA1266117A1 Automatic ground fault protection for an electric power system |
| 02/14/1990 | CN2052976U Protecting switch for losing phase overcurrent of motor |
| 02/14/1990 | CN2052975U Power saving electric magnet starter |
| 02/14/1990 | CN2052974U Three phase power contactless switch protector |
| 02/14/1990 | CN2052973U Short circuit overload protector for motor |
| 02/14/1990 | CN2052972U Power saving magnetic starter for electronic device protector |
| 02/14/1990 | CN2052946U Power saving protector |
| 02/14/1990 | CN1039665A Bidirectional dc power controller with fault protection |
| 02/13/1990 | US4901181 Motor control device |
| 02/13/1990 | US4900994 Protection circuit for a power window apparatus |
| 02/13/1990 | US4900951 Latch-up restoration circuit |
| 02/07/1990 | CN2052584U Open-phase protector for three-phase asynchronous motor |
| 02/07/1990 | CN2052583U Keysets for open-phase of three-phase motor |
| 02/07/1990 | CN2052582U Protector for multi-function ac motor |
| 02/07/1990 | CN1039512A Protection device for the phase failure and over-corrent of three phase asynohronous motor |
| 02/06/1990 | US4899247 Auto recloser coil burn-out protection |
| 01/31/1990 | EP0352951A2 A.C. generator fault detector |
| 01/31/1990 | EP0352593A2 Monitoring device for a ventilator |
| 01/31/1990 | CN2052162U Arrester for computer |
| 01/30/1990 | US4897760 Capacitor disconnection |
| 01/30/1990 | US4897607 Method and device for detecting and localizing faults in electrical installations |
| 01/30/1990 | US4897557 Electronic control system, in particular for a printer |
| 01/30/1990 | CA1265247A1 Method and device for detecting and localizing faults in electrical installations |
| 01/30/1990 | CA1265194A1 Protection circuit for switching power supply |
| 01/25/1990 | WO1990000830A1 Conversion circuit for limiting inrush current |
| 01/25/1990 | WO1990000803A1 Winding arrangement for a cryomagnet |
| 01/24/1990 | EP0351756A1 Circuit arrangement for protecting an integrated circuit against a non-allowed input voltage imposed on an input stage |
| 01/24/1990 | EP0165310B1 Apparatus and method for detecting a rotating rectifier fault |
| 01/24/1990 | CN2051797U Protector for motor |
| 01/23/1990 | US4896242 Direct AC-DC converter fault protection system |
| 01/23/1990 | US4896241 Directional comparison blocking protective relay system |
| 01/23/1990 | CA1264802A1 Motor control method and apparatus therefor |
| 01/18/1990 | DE3919407A1 Verfahren zum steuern eines verdichters und steuerungseinrichtung A method for controlling a com- pressor and control device |
| 01/18/1990 | DE3917375A1 Method for inhibiting triggering pulses |
| 01/17/1990 | EP0350829A2 Selective protective device against short-circuit currents |
| 01/17/1990 | EP0350824A2 Selective overcurrent protection device |
| 01/17/1990 | CN2051415U Selfcoupling voltage reduction starter for production lossof phase of full power source |
| 01/17/1990 | CN1038914A Power supply fault protection circuit |
| 01/17/1990 | CN1006511B Information data output arrangement for electric power system |
| 01/10/1990 | EP0350299A2 Bi-directional DC power controller with fault protection |
| 01/10/1990 | EP0349923A2 A control means for a universal electric motor |
| 01/10/1990 | CN2051025U Electric motor starting protector |
| 01/09/1990 | US4893159 Protected MOS transistor circuit |
| 01/03/1990 | EP0348673A1 Process for the protection of an electrical protection object |