| 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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| 01/16/1991 | CN2069626U Phase-sequence discrimination, low voltage and phase-lacking protector |
| 01/16/1991 | CN2069625U Industrial air-conditioning phase-finding, phase-losing and electric leakage protector |
| 01/10/1991 | WO1991000636A1 Safety device for vehicle passengers |
| 01/10/1991 | DE3921158A1 Automatic double-panel door opening and closure drive - has constant closing force with set-point control such that obstruction reduces armature current and torque |
| 01/10/1991 | DE3920263A1 Electro-motor current supply - has circuit with resistance network to give rectified AC to apply dynamic limit to motor current |
| 01/09/1991 | EP0406687A2 Video camera having DC power source light |
| 01/09/1991 | CN2069177U Ampere meter provided with protection against overcurrent and phase loss of motor |
| 01/08/1991 | US4983897 Control circuit |
| 01/08/1991 | US4982571 Automatic hydraulic activation mechanism |
| 01/02/1991 | EP0404993A1 Current limiting DC converter |
| 01/02/1991 | CN1011083B Apparatus for detecting position of internal fault of gas insulated bus |
| 01/01/1991 | US4982143 Phase control circuit for protection of a motor against thermal overload |
| 12/27/1990 | WO1990016106A1 Switching power source device and adapter for the switching power source device |
| 12/26/1990 | CN2068291U Three-phase motor protector |
| 12/26/1990 | CN1048127A Thick film and gate integrated circuit specially used in motor protector |
| 12/26/1990 | CN1048102A Device for diagnosing electric power apparatus and method |
| 12/25/1990 | US4980629 AC-excited generator/motor apparatus |
| 12/25/1990 | US4980624 Adaptive overload protection of electric motors and static switching drives |
| 12/19/1990 | EP0402353A1 Overload protection |
| 12/18/1990 | US4979069 Motor fault detector with optical isolation |
| 12/18/1990 | US4979066 Loading controlling apparatus |
| 12/18/1990 | US4978922 Superconducting sensor for quench detection in a superconductor |
| 12/18/1990 | US4978898 Motor driving and malfunction detecting device |
| 12/18/1990 | CA1278029C Apparatus and method for protecting an electrical circuit |
| 12/13/1990 | DE4017134A1 Plug-unit for switch=off monitoring esp. in HV power switch - has at least one evaluator output coupled to control relay for switch off circuit |
| 12/12/1990 | EP0402262A1 Protection arrangement against high voltage sparks |
| 12/12/1990 | EP0401768A2 A control device for driving the drum of a washing or drying machine for laundry |
| 12/12/1990 | EP0401299A1 A monitoring system. |
| 12/11/1990 | US4977363 Overheat preventing system of A.C. motor |
| 12/11/1990 | US4977362 Protection method and protection device for detecting asynchronism in the synchronous starting of a synchronous machine |
| 12/06/1990 | DE3918116A1 Monitoring function of turbogenerator rectifier - indirectly sensing commutation performance and analytically locating individual faults on rotary rectifiers |
| 12/05/1990 | EP0400405A2 Apparatus and method for diagnosis of power appliances |
| 12/04/1990 | US4975796 Reverse discharge diode capacitor |
| 12/04/1990 | CA1277369C Procedure and device to operate an hvdc transmission short coupling in the event of power system faults |
| 11/29/1990 | WO1990014690A1 Voltage stress alterable esd protection structure |
| 11/29/1990 | DE4021552A1 Safety switching of regenerative inverter feeding public network - involves periodic variation of load and energy balance with monostable circuit responsive to absence of pulse |
| 11/28/1990 | EP0399115A1 Electrical control device |
| 11/28/1990 | CN1010645B Control apparatus for brush-less motor |
| 11/27/1990 | US4973902 Fault detector for aircraft variable speed, constant frequency power supply |
| 11/27/1990 | CA1276967C Protective circuit for series capacitor banks |
| 11/21/1990 | CN1010537B Protective relaying apparatus for providing fault-resistance correction |
| 11/20/1990 | US4972290 Electric power system with remote monitoring and control of protective relays |
| 11/20/1990 | US4972289 Electric motor control and protective assembly for fluid pump operation |
| 11/20/1990 | CA1276709C Control and drive arrangement for movable members |
| 11/15/1990 | WO1990013934A1 Method and apparatus for monitoring an ac transmission line |
| 11/14/1990 | EP0397102A2 Power delivery circuit with current sensing |
| 11/14/1990 | EP0396631A1 Arrangement for controlled energy transfer for electrical supply, especially for reducing switching transients |
| 11/13/1990 | US4970446 Motor-powered opening/closing apparatus for a window or door |
| 11/13/1990 | CA1276228C Automatic on/off circuit with time delay |
| 11/08/1990 | DE3914893A1 Inverter phase current limitation by threshold comparison - using lower threshold adjusted so that in unfavourable conditions upper threshold is not exceeded during dead time |
| 11/07/1990 | CN2065372U Capacitive phase-lack protector for three-phase motor |
| 11/07/1990 | CN2065371U Protective circuit arrangement integrated with three phase motor |
| 11/07/1990 | CN1010359B Gate signal generator for thyristor valve |
| 11/06/1990 | US4968338 Inverter controlled air conditioner with optimum determination for over current detection |
| 11/06/1990 | CA1276035C Static inverter with an overcurrent circuit upon a short circuit |
| 11/06/1990 | CA1276034C Fault-protection apparatus for static ac-to-ac converters and unrestricted frequency changer (ufc) system including such fault-protection apparatus |
| 10/31/1990 | EP0395159A1 DC/AC converter for the supply of two gas and / or vapour discharge lamps |
| 10/31/1990 | DE3914312A1 Motor overload detection circuit for hand-tool - compares current and voltage values obtained from current flux angle and motor revs |
| 10/31/1990 | CN2064956U Protector for three-phase a.c. motor, submergence and oil pump |
| 10/31/1990 | CN2064953U Three-phase safety phase-failure protector |
| 10/30/1990 | US4967304 Digital circuit interrupter with electric motor trip parameters |
| 10/30/1990 | US4967133 Motor control apparatus |
| 10/24/1990 | CN1010155B Circuit protector of communication line |
| 10/24/1990 | CN1010154B Protection circuit for predetecting short-circuit by carrier-frequency signal |
| 10/24/1990 | CN1010153B Circuit arrangement for protecting switch transistor |
| 10/24/1990 | CN1010152B Improved current fault detection method |
| 10/24/1990 | CN1010151B Voltage stabilizer capable of limiting amplitude of open-circuit over-voltage to a great extent for arc furnace transformer |
| 10/23/1990 | CA1275436C Induction generator/motor system |
| 10/17/1990 | EP0392302A2 Motor monitoring switch |
| 10/17/1990 | CN2064126U Electricity-shortage protector for emergency lamp accumulator |
| 10/17/1990 | CN2064125U Fuse phase loss protector |
| 10/17/1990 | CN2064124U Fully automatic controller of three-phase motor |
| 10/17/1990 | CN2064122U Electrical appliance phase loss auto-protector for three-phase motor |
| 10/17/1990 | CN1010068B Method and device for detecting load of motor and protecting motor from overload |
| 10/16/1990 | CA1275319C Electronic reverse power relay |
| 10/10/1990 | EP0391574A1 Motor control apparatus |
| 10/10/1990 | EP0391143A2 Monitoring apparatus with switching device |
| 10/10/1990 | CN2063710U Protecting device for three phase motor |
| 10/10/1990 | CN1009981B Current source power converting apparatus with overvoltage protection |
| 10/09/1990 | US4962350 Load condition detecting and driving system |
| 10/09/1990 | US4962337 Express window lift motor shutdown |
| 10/04/1990 | WO1990011531A1 Frequency monitoring device |
| 10/03/1990 | CN2063313U Close and open relay for asymmetric fault and oscillation |
| 10/03/1990 | CN2063312U Protector for overload and short-circuit of thyristor power supply |
| 10/03/1990 | CN2063311U Phase interruption protector |
| 10/03/1990 | CN2063308U Three-phase auto-protector for interruption |
| 10/03/1990 | CA2010646A1 Motor driver protection circuit |
| 09/26/1990 | EP0388850A2 Semiconductor eletric power conversion system |
| 09/26/1990 | EP0388616A2 Overcurrent protective circuit for electrostatic self-turn-off devices |
| 09/26/1990 | EP0245415B1 Supply current limiter for a direct current electric motor |
| 09/26/1990 | CN2062916U Protector for oxygen enhancing machine |
| 09/26/1990 | CN2062915U Device for protecting start of motor and saving electricity |
| 09/26/1990 | CN2062914U Protector for error/open-phase of motor |
| 09/26/1990 | CN1045667A Device for overvoltage protection of rectifier bridge feeding dc motor and for control of dc motor during |
| 09/25/1990 | US4959598 Method and apparatus for controlling torque of a door opening and closing motor for an automatic door |
| 09/19/1990 | CN2062513U Three-phase motor open-phase monitor |
| 09/19/1990 | CN1009694B Thyristor valve |
| 09/18/1990 | US4958380 Fault current limiter for DC motor drive system |
| 09/18/1990 | US4958117 Frequency control based on sensing voltage fed to an induction motor |
| 09/13/1990 | DE4007214A1 Synchronised switch mode power supply e.g. for TV receiver - applies control voltage via transformer to PWM which responds to oscillator output signal for producing PWM control signal |