1
Neal George Stewart, Wing Ling Cheng, Chau Hon Yu: Adaptive pulse width modulated resonant Class-D converter. Astec International, Coudert Brothers, November 16, 1999: US05986895 (175 worldwide citation)

Switching losses at high line in variable-input Class-D resonant DC-to-DC power converters regulated by changing the duty cycle of the switching transistors are avoided by making the turn-off time of the discharging switch dependent upon the current in the resonant transformer primary circuit, there ...


2
David A Smith: Power factor improvement. Astec International, McCubbrey Bartels Meyer & Ward, March 19, 1991: US05001620 (132 worldwide citation)

A boost convertor power supply comprising an electronic switch controlling current through a boost inductance, a rectifier for charging a capacitor which accumulates the resulting boost charge from the boost inductance, and circuitry for repeatedly switching the electronic switch. A pulse width modu ...


3
Neal G Stewart: Multicell battery power system. Astec International, Coudert Brothers, June 6, 1995: US05422558 (131 worldwide citation)

A multicell battery power system for providing power to a load is disclosed. The battery power system includes a plurality of battery modules and power bus for transmitting power between the battery modules and the primary load. Each of the battery modules includes a battery for providing electrical ...


4
Rex W J Whittle: Start circuit for generation of pulse width modulated switching pulses for switch mode power supplies. Astec International, McCubbrey Bartels Meyer & Ward, December 12, 1989: US04887199 (123 worldwide citation)

A start circuit for starting the generation of pulse width modulated switching pulses is disclosed for use in a DC/DC switching converter power supply. The starting circuit is responsive to the initiation of a DC voltage source and starts the operation of a pulse generator. The starting circuit also ...


5
Ambrose W C Tam: RF amplifier system having multiple selectable power output levels. Astec International, McCubbrey Bartels Meyer & Ward, June 30, 1992: US05126686 (121 worldwide citation)

A control circuit for a radio frequency (rf) amplifier having multiple selectable power output levels in response to a plurality of input control signals is presented. The rf amplifier includes a variable gain input which is responsive to the control circuit. The control circuit includes an attenuat ...


6
David A Cross: Interleaved continuous flyback power converter system. Astec International, Coudert Brothers, August 18, 1998: US05796595 (111 worldwide citation)

An interleaved flyback electrical power converter system having a plurality of flyback power converters operated in continuous mode, each converter utilizing a power switch operated under zero voltage switching conditions. The interleaved flyback power converter system is highly efficient and compac ...


7
Lee Tai Keung: Snubber circuit for a power converter. Astec International, Nixon Peabody, June 10, 2008: US07385833 (94 worldwide citation)

A snubber circuit and corresponding power converter topology for controlling the voltage across the resonant capacitor at turn on of a control switch so as to suppress a spike at the switch caused by the large current pulse and parasitic inductance of the power converter. The suppression of the spik ...


8
David A Cross: Thermally aided power sharing of power supplies with or without an external current share line. Astec International, Coudert Brothers, May 18, 1999: US05905645 (90 worldwide citation)

A thermally regulated power system, where the extent to which the temperature of a power module causes a change in the output power of the module depends on the output current of the module. Similarly, the extent to which the output current of the power module causes a change in the output power of ...


9
David A Cross: Clamped continuous flyback power converter. Astec International, Coudert Brothers, October 29, 1996: US05570278 (87 worldwide citation)

Size reduction in a clamped power converter can be achieved, and stability of the converter under no-load and transient loads can be substantially improved, by operating the converter in a continuous flyback mode.


10
Piotr Markowski, Lin Guo Wang: Power supply providing ultrafast modulation of output voltage. Astec International, K&L Gates, December 28, 2010: US07859336 (85 worldwide citation)

A circuit for use with a power amplifier that amplifies an input signal. The circuit may comprise an amplitude correction circuit and an open-loop switching regulator. The amplitude correction circuit may be configured to generate a corrected envelope signal from an input envelope signal that repres ...