| Patents for H02J 9 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting (16,437) |
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| 09/27/1990 | DE3908324A1 Circuit arrangement for battery buffering of the power supply of electrical hardware modules |
| 09/27/1990 | CA2013116A1 Rechargeable battery system for maintaining volatile memory data in a computer |
| 09/19/1990 | CN2062542U Ac/dc electronic emergency charging fluorescent lamp |
| 09/11/1990 | US4956563 Standby power supply |
| 08/23/1990 | DE4004734A1 Anordnung zum betreiben eines elektrischen oder elektromagnetischen geraetes oder bauteiles Operate arrangement for an electrical or electromagnetic device or component |
| 08/21/1990 | US4951171 Power supply monitoring circuitry for computer system |
| 08/16/1990 | DE4003972A1 Unbegrenzt autonomes stromaggregat zum aufrechterhalten einer ununterbrochenen stromversorgung ohne hilfe von akkumulatorenbatterien Unlimited autonomous generator set to maintain an uninterrupted power supply without the help of batteries batteries |
| 08/14/1990 | US4948044 Electronic digital thermostat having an improved power supply |
| 08/14/1990 | US4947977 Apparatus for supplying electric current and compressed air |
| 08/07/1990 | US4946096 Method and apparatus for operating a furnace from a 12V DC battery |
| 07/31/1990 | US4945280 Independent emergency lighting system with self-diagnosis |
| 07/26/1990 | WO1990008233A1 Service machine stopping apparatus for midget rotary power shovel |
| 07/25/1990 | EP0378532A1 Circuit to inhibit voltage and current returns to the electric power distribution line in an inverter-type power plant. |
| 07/19/1990 | CA2008173A1 Integrated outlet for communications and closed loop electrical power |
| 07/18/1990 | EP0378085A2 Exhaust gas turbine generator apparatus |
| 07/18/1990 | EP0377693A1 Low leakage battery protection diode structure |
| 07/04/1990 | EP0376191A1 Power supply switch for electrical equipment, and remote control terminal apparatus provided with such a switch |
| 07/04/1990 | EP0375793A1 Power supply circuit with a power interruption back-up battery |
| 07/03/1990 | US4939432 AC/DC automatic changeover and automatic charge device |
| 06/26/1990 | US4937403 Power source switching device |
| 06/26/1990 | CA1270901A1 Power supply with battery backup |
| 06/19/1990 | US4935928 DC supply for an S-bus in ISDN |
| 06/19/1990 | US4935861 Uninterrupted power supply having no low frequency power magnetics |
| 06/14/1990 | WO1990006614A1 Safety device to prevent excessive battery drain |
| 06/07/1990 | DE3841769C1 Circuit for ensuring the provision of starting energy in motor vehicles with internal combustion engines |
| 06/06/1990 | EP0371556A1 Circuit arrangement for powering a load |
| 06/05/1990 | US4931367 Low float technology battery |
| 05/23/1990 | EP0316314B1 Safety device for car passengers |
| 05/16/1990 | EP0367761A1 Backup electrical system for lamps. |
| 05/08/1990 | CA1268811A1 Static converter, especially for an uninterruptible electrical power supply system |
| 05/01/1990 | CA1268450A1 Emergency lighting for elevator cab |
| 04/26/1990 | DE3935564A1 Geraet zum parallelen betreiben von nichtunterbrechbaren dreiport-leistungsversorgungseinrichtungen Geraet for parallel run of three uninterruptible power port-care facilities |
| 04/18/1990 | EP0364371A1 Apparatus for controlling and charging a battery of accumulators in particular |
| 04/18/1990 | CN1041490A Full-automatic fast electric generating and supply equipment for electrically started diesel engine set |
| 04/10/1990 | US4916329 Uninterruptible power supply |
| 04/10/1990 | CA1267717A1 High speed load transfer system |
| 04/09/1990 | EP0294394A4 Peak power shaving apparatus and method. |
| 03/29/1990 | DE3926351A1 Power supply installation suitable for important electronic system - has emergency constant voltage source(s) connected via diode(s) and having current limiter(s) |
| 03/22/1990 | WO1990002670A1 Electrical supply control system for a motor vehicle |
| 03/21/1990 | EP0359027A1 Stand-by set for a dynamic breakdown-free current supply |
| 03/21/1990 | EP0358654A1 Supply system for uninterruptible electric power |
| 03/21/1990 | CN1040724A Lighting supply circuit |
| 03/14/1990 | EP0358191A2 PWM-controlled power supply capable of eliminating modulation-frequency signal components from ground potentials |
| 03/13/1990 | US4908523 Electronic circuit with power drain control |
| 02/27/1990 | US4904880 Automatic door driving system |
| 02/20/1990 | US4903011 Lamp drive circuit |
| 02/20/1990 | US4902956 Safety device to prevent excessive battery drain |
| 02/14/1990 | EP0354450A1 Circuit arrangement for selectively feeding a user by means of one of two feeding circuits |
| 02/07/1990 | CN2052592U Charged electric wax |
| 01/30/1990 | CA1265193A1 Electrical power supply with an alternating voltage output |
| 01/24/1990 | CN1039158A Uninterruptible power source equipment |
| 01/18/1990 | DE3824259A1 Circuit arrangement for a differential voltage detection on the DC-voltage intermediate circuit of an indirect converter |
| 01/16/1990 | US4894765 Bi-directional d.c./d.c. converter compatible with an inverter bridge |
| 01/16/1990 | US4894601 Testing and battery exercising method and control for an emergency lighting unit |
| 01/11/1990 | DE3931558A1 Rectifier loading control circuit in DC=AC converter - uses voltage and current controlled power setting devices with LP filter and PI-controller |
| 01/03/1990 | EP0348478A1 Voltage fault detector |
| 12/27/1989 | CN2050233U Battery voltage-lacking protecting device for emergency lamp |
| 12/26/1989 | US4890200 Down lighting systems and fixtures therefor |
| 12/26/1989 | US4890005 Standby power supply line voltage fault detector |
| 12/26/1989 | US4890004 Emergency light control and battery charging system |
| 12/26/1989 | US4890003 Capacitively buffered power supply for an electronic device |
| 12/26/1989 | US4890002 Line voltage fault detector for appliance protection |
| 12/14/1989 | DE3916388A1 Emergency electrical power supply system |
| 12/14/1989 | DE3819134A1 Electrical refrigerator, especially a deep-freeze cabinet, deep-freeze trunk or the like |
| 12/12/1989 | US4887004 Emergency lighting system |
| 12/12/1989 | US4886979 Power source circuit device for monitors and host computers |
| 12/06/1989 | CN2049037U Regulated power supply with automatic bault switching-over |
| 12/05/1989 | US4885523 Battery conditioning system having communication with battery parameter memory means in conjunction with battery conditioning |
| 12/05/1989 | US4885521 Unique computer power system with backup power |
| 12/05/1989 | US4885474 Connector assembly for plug-in energization and battery activation of an associated electrical apparatus |
| 11/30/1989 | WO1989011749A1 Constant-voltage supply system with a plurality of constant-voltage sources |
| 11/29/1989 | EP0343578A2 Releasing circuit for actuating vehicular safety device |
| 11/29/1989 | CN2048666U Household enmergency lamp |
| 11/23/1989 | EP0342693A1 DC power supply system with a plurality of DC sources |
| 11/23/1989 | EP0342579A1 Apparatus for testing the autonomy of an emergency-lighting unit |
| 11/16/1989 | DE3815475A1 Power supply device |
| 11/09/1989 | DE3912941A1 Electrical power supply unit |
| 11/08/1989 | EP0340787A2 Ride-through energy boost circuit |
| 11/08/1989 | EP0340292A1 Power supply system for segmented loads |
| 11/07/1989 | US4879624 Power controller |
| 11/02/1989 | WO1989010650A1 Low leakage battery protection diode structure |
| 11/01/1989 | CN1005624B Elevator rescue apparatus during stoppage of power supply |
| 10/31/1989 | US4877972 Fault tolerant modular power supply system |
| 10/24/1989 | US4876460 Uninterrupted power supply |
| 10/12/1989 | EP0271498A4 Emergency power system. |
| 10/10/1989 | USRE33087 Electric power distribution and load transfer system |
| 10/05/1989 | DE3810397A1 Power supply for an electrical device |
| 10/04/1989 | EP0335316A2 Apparatus for controlling selection of batteries |
| 09/26/1989 | CA1261957A1 Redundant power supply system |
| 09/26/1989 | CA1261390A1 Variable frequency power source operating system |
| 09/21/1989 | DE3807942A1 Device for emergency power supply of motor vehicles when the generator (dynamo) fails |
| 09/20/1989 | EP0333275A2 Power supply device |
| 08/31/1989 | DE3805256A1 Reserve circuit for supplying emergency power to a load in a vehicle |
| 08/30/1989 | EP0330581A1 Method and device for feeding an electrical installation , and its use in lamps |
| 08/30/1989 | EP0330274A1 DC supply for an S-bus in ASDN |
| 08/29/1989 | US4862310 Low leakage battery protection diode structure |
| 08/24/1989 | WO1989007855A1 Backup electrical system for lamps |
| 08/23/1989 | EP0328706A1 Safety device for control and regulation systems |
| 08/22/1989 | US4860185 Integrated uninterruptible power supply for personal computers |
| 08/15/1989 | US4858196 Power supply arrangement |