| Patents for H02J 9 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting (16,437) |
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| 06/05/1991 | EP0430009A1 Power supply unit for a vacuum pump with magnetic thrust bearings and with an auxiliary power supply for the thrust bearings in case of a power failure |
| 05/30/1991 | WO1991007803A1 Uninterruptible power supply |
| 05/28/1991 | US5019803 Detector units |
| 05/28/1991 | US5019717 Computer-controlled uninterruptable power supply |
| 05/21/1991 | US5017800 AC to DC to AC power conversion apparatus with few active switches and input and output control |
| 05/15/1991 | CN2077168U Supply control device of stand-by generator group |
| 05/15/1991 | CN1051466A Uninterruptible electric power system using gas turbine as driven power |
| 05/14/1991 | WO1991007802A1 Resonant converter having current shunting means |
| 05/14/1991 | US5015919 Emergency lighting system provided with a fluorescent tube |
| 05/14/1991 | US5015870 Voltage supply circuit |
| 05/14/1991 | CA2069897A1 Shunt circuit for reducing audible noise at low loading conditions of a power supply employing a high frequency resonant converter |
| 05/10/1991 | WO1991007808A1 An uninterrupted power supply system having improved power factor correction circuit |
| 05/10/1991 | CA2069896A1 Uninterrupted power supply system having improved power factor correction circuit |
| 05/08/1991 | DE4018060A1 Universal car and domestic accumulator light with emergency function - has electronic automatic changeover circuit and slide switch for mains |
| 05/02/1991 | EP0363356B1 Power supply for electronic devices, in particular for safety-related devices in motor vehicles |
| 04/30/1991 | US5012122 Circuit to inhibit voltage and current returns to the electric power distribution line in an inverter-type power plant |
| 04/30/1991 | US5012121 Electrical power supply for short term power interruptions |
| 04/23/1991 | US5010469 Uninterruptible power supply with dual level voltage input |
| 04/10/1991 | EP0421574A2 Firing circuit |
| 04/10/1991 | EP0154626B1 Uninterruptible power system |
| 04/09/1991 | US5005687 Control system for automatic transmission apparatus for vehicles |
| 04/04/1991 | WO1991004601A1 Automatic control circuit for backup voltage supply |
| 04/04/1991 | CA2020324A1 Firing circuit |
| 04/03/1991 | EP0420645A2 An intelligent power supply system for a portable computer |
| 04/03/1991 | EP0420628A2 AC to DC to AC power conversion apparatus with few active switches and input and output control |
| 04/03/1991 | EP0419667A1 Service machine stopping apparatus for midget rotary power shovel |
| 04/03/1991 | CN1050472A 电源系统 Power Systems |
| 04/02/1991 | US5004963 Accelerometer based power control apparatus for aircraft subsystem |
| 03/30/1991 | CA2025847A1 Ac to dc to ac power conversion apparatus with few active switches and input and output control |
| 03/27/1991 | EP0419015A2 Power supply system |
| 03/27/1991 | CN1050291A Static random memory electric ity losing protective socket |
| 03/27/1991 | CN1012244B Uninterruptible power source equipment |
| 03/26/1991 | US5003432 Down lighting systems and fixtures therefor |
| 03/13/1991 | EP0416569A2 Method and apparatus for line power monitoring for uninterruptible power supplies |
| 03/13/1991 | EP0415971A1 Constant-voltage supply system with a plurality of constant-voltage sources |
| 03/13/1991 | CN1049938A 电源装置 Power supply unit |
| 03/06/1991 | EP0415662A2 An arrangement for supervising the condition of a safety light system |
| 03/06/1991 | EP0415621A2 Communication system for single point emergency lighting |
| 03/01/1991 | CA2284577A1 Communication system for single point emergency lighting |
| 03/01/1991 | CA2020090A1 Communication system for single point emergency lighting |
| 02/27/1991 | EP0414093A2 Circuit arrangement for charging rectifier for a direct current energy accumulator of a telecommunication installation especially for telecommunications exchanges |
| 02/21/1991 | DE3926990A1 Mains supply with battery back-up - switched in by relay stages to maintain continuity esp. in hospital |
| 02/19/1991 | US4994726 Power supply apparatus for charging-type device |
| 02/19/1991 | US4994685 Regulated power supply and method |
| 02/13/1991 | CN1011656B Static converter, especially for uninterruptible electrical power supply system |
| 02/06/1991 | CN1049074A Uninterruptible power supply |
| 01/31/1991 | CA2014906A1 Electrical-energy-supplying device having an extended storage life |
| 01/30/1991 | EP0410716A2 Uninterruptible power supply |
| 01/30/1991 | EP0410559A2 Power supply device |
| 01/30/1991 | CN2070510U Three-phase ac motor matched generator |
| 01/29/1991 | US4988889 Battery operated |
| 01/23/1991 | CN2070073U Ac/dc fluorescent lamp |
| 01/23/1991 | CN1011371B Full automatic fast generator of diesel engine starting by electricity |
| 01/22/1991 | US4987316 Passenger restraint firing circuit |
| 01/17/1991 | DE4021967A1 Main and auxiliary battery housing for camera - comprises auxiliary chamber joined to main chamber via opening closed when main rectangular battery is inserted |
| 01/16/1991 | EP0407525A1 Safety device to prevent excessive battery drain. |
| 01/15/1991 | US4985819 AC-DC-AC apparatus having battery charging and discharging feature |
| 01/15/1991 | US4985661 Uninterrupted desk lamp |
| 01/15/1991 | CA1279098C Selective connection of power supplies |
| 01/10/1991 | WO1991000637A1 Voltage supply device for electronic appliances |
| 01/10/1991 | WO1991000636A1 Safety device for vehicle passengers |
| 01/10/1991 | DE3921305A1 Spannungsversorgungseinrichtung fuer ein elektronisches geraet Voltage supply device for an electronic geraet |
| 01/09/1991 | CN1011174B Control apparatus of converter |
| 01/02/1991 | EP0405911A2 Regulated dc power supply |
| 01/02/1991 | CN1011110B Emergency d.c. power supply with emergency state being indicated by polarity reversal |
| 01/01/1991 | US4982149 Electric supply apparatus having means for correcting supply voltage fluctuations |
| 12/27/1990 | WO1990016106A1 Switching power source device and adapter for the switching power source device |
| 12/27/1990 | WO1990016105A1 Uninterruptible power supplies |
| 12/27/1990 | WO1990016033A1 Hand-held data capture system with interchangeable modules |
| 12/27/1990 | EP0404588A2 A power supply control system for a computer |
| 12/26/1990 | CA2016070A1 Regulated power supply and method |
| 12/25/1990 | US4980812 Uninterrupted power supply system having improved power factor correction circuit |
| 12/25/1990 | US4980746 Integrated circuit with improved battery protection |
| 12/19/1990 | EP0402834A2 Circuit for monitoring the voltage of a selected DC power supply in a redundant power supply system |
| 12/19/1990 | EP0402833A2 Circuit for monitoring the voltage of a selected DC power supply device in a redundant power supply system |
| 12/19/1990 | EP0402539A1 Detector units |
| 12/18/1990 | US4979094 For controlling electrically powered domestic equipment in a dwelling |
| 12/11/1990 | US4977353 Communication system for single point emergency lighting |
| 12/11/1990 | US4977351 Emergency lighting system |
| 12/08/1990 | CA2020357A1 Hand-held data capture system with interchangeable modules |
| 12/04/1990 | US4975592 Current supply arrangement having a stand-by mode featuring low power consumption |
| 11/28/1990 | CN1047381A Refrigerating system for use in vehicle with engine which enables selective use of commercial ac power source and generator driven by engine for driving refrigerant compressor |
| 11/22/1990 | EP0398743A2 Refrigerating system for use in vehicles |
| 11/22/1990 | EP0398722A2 Uninterruptable power supply apparatus and isolating method thereof |
| 11/20/1990 | US4970872 Blocking valve for refrigeration or air conditioning systems |
| 11/19/1990 | CA2017261A1 Refrigerating system for use in vehicle with engine which enables selective use of commercial ac power and a generator driven by the engine for driving the refrigerant compressor |
| 11/15/1990 | DE3915475A1 Sensor measuring charge of accumulator with moving float - dependent on acid density and float on surface of electrolyte and sensor for measuring temp. |
| 10/31/1990 | EP0395590A1 Electronic control device for at least one electrically driven receiver |
| 10/31/1990 | CN2064970U Controller for incandescent lamp and emergency lamp |
| 10/28/1990 | CA2015642A1 Uninterruptible power supply with a variable speed drive driving an induction motor/generator |
| 10/23/1990 | US4965462 Stand-by power supply |
| 10/18/1990 | WO1990012442A1 A rechargeable battery system for maintaining volatile memory data in a computer |
| 10/18/1990 | WO1990012440A1 System separation detector for power source of distributed type |
| 10/16/1990 | US4962680 Electronic control device for a drive system |
| 10/10/1990 | EP0152457B1 Control circuit for uninterruptible power supply |
| 10/10/1990 | CN1009982B Uninterruptible power supply with isolated bypass winding |
| 10/04/1990 | DE3910624A1 Power-failure activated coupled switch |
| 10/04/1990 | DE3910183A1 Textile machine, especially ring-spinning machine |
| 10/03/1990 | EP0389997A2 Circuit arrangement for bridging failures of a first alternative power source connected to a network for uninterruptible power supply of electronic or electric analog or digital time switch circuits especially switchclocks |
| 10/02/1990 | US4961043 Battery conditioning system having communication with battery parameter memory means in conjunction with battery conditioning |