| 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) |
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| 08/21/1991 | CN1053972A Protection device integrated in three-phase electric motor |
| 08/20/1991 | CA1287867C Bus differential relay |
| 08/14/1991 | EP0441734A2 Line protection circuit for an integrated services digital network |
| 08/14/1991 | EP0440754A1 Generator with auxiliary fan. |
| 08/14/1991 | CN2082914U Rectification device for excitation of brushless generator |
| 08/14/1991 | CN2082911U New style over-load and short-circuit protective device for transistors |
| 08/14/1991 | CN2082910U Protector for three-phase a.c. motor |
| 08/14/1991 | CN2082909U Low-voltage distributively compensating capacitor open-phase protective device |
| 08/14/1991 | CN2082908U Secondary circuit disconnection protective device of current transformer |
| 08/13/1991 | US5040088 Electric motor controllers |
| 08/13/1991 | US5039028 Overload protection |
| 08/06/1991 | US5038244 Device for overvoltage protection of a rectifier bridge feeding a d.c. motor and for control of the d.c. motor during emergency braking |
| 08/06/1991 | US5038088 Stepper motor system |
| 08/01/1991 | DE4003216A1 Pulse recognition circuit for thyristor emergency ignition arrangement - derives usable firing signal from protracted discharge of capacitor through input impedance of Schmitt trigger circuit |
| 08/01/1991 | DE4002485C1 Protecting LV lighting systems independently of load - using comparator, timer, max. power adjuster and recorder for amt. of dimming |
| 08/01/1991 | DE4000730A1 Verfahren und vorrichtung zum betreiben von fremdkraftbetaetigten teilen mit einklemmgefahr Method and device for operating of fremdkraftbetaetigten share of crushing |
| 07/31/1991 | EP0438827A1 Apparatus comprising an electric motor having a variable motor power |
| 07/31/1991 | EP0207087B1 Re-regulation circuit for automobile tachometer detection circuit |
| 07/31/1991 | CN2082045U Phase lost protector |
| 07/31/1991 | CN2082044U Lost or weak magnetism protector for excitation of d.c. motor |
| 07/31/1991 | CN2082043U Starter for protecting motor |
| 07/30/1991 | CA1287159C Range limitation for a protection device in a power supply network |
| 07/30/1991 | CA1287103C Cmos latch-up recovery circuit |
| 07/25/1991 | WO1991011049A1 Protective circuit for an electrical consumer |
| 07/25/1991 | WO1991011048A1 Digital differential relay system |
| 07/25/1991 | WO1991010800A1 Process and device for operating externally powered components in which a body part or other object could be caught |
| 07/25/1991 | DE4016574A1 Terminal voltage limiter for three=phase alternator - uses overvoltage-dependent switch for automatic disconnection of exciter winding |
| 07/24/1991 | EP0437748A1 Method for monitoring structures of capacitors |
| 07/24/1991 | CN2081597U Multi-functional protector for motor |
| 07/24/1991 | CN2081596U Electronic thermorelay |
| 07/24/1991 | CN1053333A Control system for rare-earth permanent magnet brushless dc motor of refrigerator |
| 07/24/1991 | CN1053326A Open-phase protection device for low voltage motor |
| 07/23/1991 | CA1286719C Shutdown circuit for blocking oscillator power supply |
| 07/23/1991 | CA1286713C Method of limiting motor power output |
| 07/20/1991 | CA2034252A1 Apparatus comprising an electric motor having a variable motor power |
| 07/18/1991 | DE4000820A1 Schutzschaltung fuer einen elektrischen verbraucher Protection circuit for an electrical load |
| 07/17/1991 | CN2081166U Full-automatic protector for electronic transformer of neon lamp |
| 07/17/1991 | CN2081165U Electronic start protector for three-phase motor |
| 07/16/1991 | US5032971 Power sypply system for converting an A.C. power supply voltage into D.C. power supply voltage |
| 07/16/1991 | CA1286352C Thermal protection device for a dual input voltage lamp transformer/ballastapparatus |
| 07/11/1991 | DE4000108A1 Low voltage lamp overheating protector - compares lamp current with set manned current and set deviation outside given range |
| 07/10/1991 | CN2080605U Safety protective device for opening and shuting system of electric valve |
| 07/03/1991 | EP0434843A1 Switching power source device and adapter for the switching power source device |
| 07/03/1991 | CN2080254U Over voltage protector for large inductance load transistor |
| 07/02/1991 | US5029269 Delayed power supply overvoltage shutdown apparatus |
| 07/02/1991 | US5029040 Output circuit having a fail-safe function |
| 07/02/1991 | US5028211 Torque coupling system |
| 07/02/1991 | CA1285644C Directional detection in connection with faults in a power supply network |
| 06/26/1991 | EP0433328A1 Electrical supply control system for a motor vehicle. |
| 06/26/1991 | CN2079823U Loss of phase protecting ac contactor for motor |
| 06/26/1991 | CN2079822U Loss of phase protector for triphase ac motor |
| 06/26/1991 | CN2079821U Auto-protecting switch for loss of phase |
| 06/25/1991 | US5027038 DC/AC converter for the supply of a gas and/or vapor discharge lamp |
| 06/25/1991 | CA1285319C State signal formation for indicating the transition into the bypass mode of operation in an apparatus for high-voltage d-c transmission |
| 06/25/1991 | CA1285313C Electric motor load sensing system |
| 06/20/1991 | DE3941207A1 Protection circuit for electric motor current supply - has sensor monitoring both feed current and feed back current with choke coils limiting current gradient |
| 06/19/1991 | EP0432747A2 Over-loading monitoring system for electric motor in automotive engine simulating apparatus |
| 06/19/1991 | CN2079379U Undisconnect power source storage battery protective controller |
| 06/19/1991 | CN2079378U Three-phase motor phase-loss protector |
| 06/19/1991 | CN2079377U Full-automatic motor protective switch |
| 06/18/1991 | US5025198 Torque coupling system for graphite impeller shafts |
| 06/18/1991 | US5025119 Electrical control signal |
| 06/12/1991 | EP0432085A2 Protection for electrically driven device |
| 06/12/1991 | EP0431812A2 Luminous tube protection circuit |
| 06/12/1991 | CN2078943U Direct-current control open-phase silicon-controlled protector |
| 06/12/1991 | CN2078942U Microcomputer-type differential relay |
| 06/11/1991 | US5023539 Alternator voltage transient minimization method and apparatus |
| 06/11/1991 | US5023529 Control circuit |
| 06/05/1991 | EP0429930A2 Protection device for high temperature batteries |
| 06/05/1991 | CN2078505U Electricity-saving device for three-phase a.c. motor |
| 06/05/1991 | CN2078501U Open phase over-current protector for motor |
| 06/04/1991 | US5021722 Composable protection and control apparatus for motors |
| 06/04/1991 | US5021620 High frequency heating apparatus with a temperature compensated switching element |
| 05/30/1991 | WO1991007797A1 Protection device for frequency converter |
| 05/29/1991 | CN2078055U Synthesizing protecting device of three phases motor |
| 05/29/1991 | CN2078054U Multifunctional wide scope protecting device for motor |
| 05/28/1991 | US5019934 Capacitor circuit interruption |
| 05/28/1991 | US5019883 Input protective apparatus of semiconductor device |
| 05/22/1991 | CN2077616U Interphase distance relay |
| 05/22/1991 | CN2077615U Protector for electric motor |
| 05/21/1991 | US5017846 Stall protection circuit for an electronically commutated motor |
| 05/16/1991 | WO1991006968A1 Flyback current dampening apparatus |
| 05/16/1991 | DE3937447A1 Schutzeinrichtung fuer frequenzumrichter Protective device for frequency converters |
| 05/16/1991 | DE2954670C2 Electrically powered vehicle window drive |
| 05/15/1991 | EP0427043A2 Process and device for extending a stall-protection function for electric motors |
| 05/15/1991 | CN1051465A General protective circuit for electric motor |
| 05/14/1991 | CA1284176C Method and arrangement for protecting turbine generators against subsynchronous resonances occuring in power transmission systems |
| 05/09/1991 | CA2002654A1 Express window lift motor shutdown |
| 05/08/1991 | DE4100586A1 Metal-encapsulated HV DC appts. - has electrode attached to isolating part coupled to leakage current detection circuit |
| 05/08/1991 | CN2076725U Patch bay type motor protector |
| 05/08/1991 | CN2076724U High-speed self-protecting type driver for high power tube base electrode |
| 05/08/1991 | CN2076723U Multifunctional protector for ac motor |
| 05/07/1991 | US5014153 Transformer differential relay |
| 05/02/1991 | EP0425035A2 Overload protection drive circuit for a power transistor |
| 05/02/1991 | EP0424442A1 Winding arrangement for a cryomagnet. |
| 05/02/1991 | DE3936338A1 Short-circuit protection of GTO thyristor pulse inverter - allows conduction through intermediate circuit fuse during first half-cycle only before blocking at zero current |
| 05/01/1991 | CN2076278U Loss-of-phase protection arrangement for motor |
| 04/30/1991 | US5012382 Low impedance power conditioner apparatus and method |
| 04/30/1991 | US5012381 Motor drive circuit with reverse-battery protection |
| 04/30/1991 | US5012168 Method and apparatus for detecting stall current in an energized electric motor |