1
Frederick A Stich, Thomas G Hubert, David L Layden, Donald K Zahrte: Uninterruptible power system. Best Power Technology Incorporated, Foley & Lardner, February 11, 1997: US05602462 (281 worldwide citation)

An uninterruptible power system has a transformer with a primary connected to input terminals, a secondary connected to output terminals, a static switch connected between the input terminals and the primary, and an auxiliary primary connected to an inverter which is supplied by a battery to provide ...


2
David L Layden, Michael J Cane, Robert Bishop: Method and apparatus for connection and disconnection of batteries to uninterruptible power systems and the like. General Signal Power Systems, Foley & Lardner, April 8, 1997: US05619076 (31 worldwide citation)

Connection of batteries to the DC bus lines across which capacitors are connected in power systems, such as uninterruptible power systems, is carried out using an auxiliary switch which is controlled to connect the batteries to a DC bus line through a precharge resistor momentarily before connection ...


3
Donald K Zahrte Sr, David L Layden, Frederick A Stich, Douglas C Folts: Inverter having center switch and uninterruptible power supply implementing same. Powerware Corporation, Leydig Voit & Mayer, July 24, 2001: US06266260 (22 worldwide citation)

Presented is a center switching circuit and an inverter and an uninterruptible power supply (UPS) utilizing same. The center switching circuit selectively enables and disables power flow to and from the bus capacitors of an inverter or UPS. As such, the center switching circuitry effectively removes ...


4
Frederick A Stich, Richard V Baxter Jr, Herbert A Podewils, David L Layden: Inverter and battery testing for uninterruptible power systems. Best Power Technology, Foley & Lardner, January 26, 1993: US05182518 (19 worldwide citation)

The inverter of an uninterruptible power system is tested by turning on switches in the inverter at a selected test phase in each half-cycle of the AC input waveform so that the inverter provides a voltage which opposes the AC input voltage waveform during part of each half-cycle of the waveform. Th ...


5
Richard V Baxter Jr, Robert F Bourke, David R Ellingson, Terrance D Paul, David L Layden: Method and apparatus for modulating inverter pulse width. Best Power Technology, Pensar Corporation, Michael Piontek, September 8, 1987: US04692854 (19 worldwide citation)

A method and apparatus are disclosed for use with a battery powered inverter for powering a load through a ferroresonant transformer. The current flow through the inverter-ferroresorant transformer is sensed and is utilized to modulate the inverter's pulse width at a point, after a peak voltage but ...


6
Robert F Bourke, David L Layden, Richard I Cook: Gated parallel power switching devices protection circuit. Best Power Technology, Michael Piontek, January 5, 1988: US04717996 (6 worldwide citation)

Two or more gated type power switches, particularly mosfets, are disclosed in a protection circuit which protects the other power switches should one of them short to its respective gate. The circuit includes elements for sensing the occurrence of the failure, for carrying or diverting excess curren ...


7
David L Layden: Power supply for vacuum fluorescent displays. Best Power Technology, Foley & Lardner, March 19, 1991: US05001399 (4 worldwide citation)

A power supply for vacuum fluorescent displays has a source of a relatively high frequency signal which is provided to a power driver amplifier which is also supplied with a desired supply voltage. The output of the driver amplifier is a square-wave signal varying between approximately zero and the ...