Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1998-11-03
1999-11-30
Riley, Shawn
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
323224, G05F 110
Patent
active
059948825
ABSTRACT:
A boost DC-DC converter with a synchronous composite rectifier is presented. The boost DC-DC converter limits inductive in-rush current, includes a shutdown mode, operates also in step-down mode, and can be fabricated using conventional bipolar processes. The composite rectifier includes a power NPN transistor and a lateral PNP transistor. During converter start-up and in step-down mode (when the output voltage is less than the input voltage), the lateral PNP transistor drives the power NPN transistor. The lateral PNP transistor is biased such that inductive volt-second balance can be maintained, limiting in-rush current. In boost mode (when the output voltage is higher than the input voltage), the lateral PNP transistor is disabled and the power transistor is driven into saturation. Again, inductive volt-second balance can be maintained.
REFERENCES:
patent: 5572417 (1996-11-01), Vinciarelli et al.
"LT1300 Micropower High Efficiency 3.3/5V Step-Up DC/DC Converter" (data sheet), 1994 Linear Databook, vol. III, pp. 4-478 to 4-485, Linear Technology Corporation, Milpitas, CA (1994).
"LT1305 Micropower High Power DC/DC Converter with Low-Battery Detector" (data sheet), 1995 Linear Databook, vol. IV, pp. 4-290 to 4-297, Linear Technology Corporation, Milpitas, CA (1995).
"LT1307 Single Cell Micropower 600kHz PWM DC/DC Converter" (data sheet), 1996 Linear Databook, vol. V, pp. 4-160 to 4-173, Linear Technology Corporation, Milpitas, CA (Jul. 1996).
"MAX877L/MAX878L/MAX879L Step-Up/Step-Down DC-DC Converters" (date sheet), pp. 1-12, Maxim Integrated Products, Sunnyvale, CA (Jul. 1996).
"ML4875 Low Voltage Boost Regulator with Shutdown" (data sheet), pp. 1-10, Micro Linear Corporation, San Jose, CA (Jul. 1996).
"UCC3941-3/-5/-ADJ 1V Synchronous Boost Converter" (data sheet), pp. 1-9, Unitrode Corporation, Merrimack, NH (Mar. 1997).
Linear Technology Corporation
Morris Robert W.
Riley Shawn
Tuma Garry J.
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