One of the most critical components in a step-up design like Figure 1 is the TRANSFORMER. TRANSFORMERs have parasitic components that can cause them to deviate from their ideal characteristics, and the parasitic capacitance associated with the secondary can cause large resonating current spikes on the leading edge of the switch current waveform.
Abstract: This document details the Lakewood (MAXREFDES7#) subsystem reference design, a 3.3V input, ±12V (±15V) output, isolated power supply. The Lakewood reference design includes a 3W primary-side TRANSFORMER H-bridge driver for isolated supplies, and two wide input range and adjustable output low-dropout linear regulators (LDOs). Test results and hardware files are included.
Abstract: This document details the Riverside (MAXREFDES8#) subsystem reference design, a 3.3V input, 12V (15V) output, isolated power supply. The Riverside reference design includes a 3W primary-side TRANSFORMER H-bridge driver for isolated supplies, and one wide input range and adjustable output low-dropout linear regulator (LDO). Test results and hardware files are included.
Abstract: This document details the Oceanside (MAXREFDES9#) subsystem reference design, a 3.3V to 15V input,±15V (±12V) output, isolated power supply. The Oceanside design includes a high-efficiency step-up controller, a36V H-bridge TRANSFORMER driver for isolated supplies, a wide input range, and adjustable output low-dropout linearregulator (LDO). Test results and hardware files are included.
Abstract: With its small size and large load (10W) capability, the MAX13256 H-bridge TRANSFORMER driver is an attractive solution forcharging supercapacitors (supercaps). However, a large capacitance on the output of the circuit can force the driver into fault modeat startup, due to the high initial charge current. This application note presents a solution that allows users to charge a largecapacitance without going into fault.
Many system designers need an easy way to producea negative 3.3V power supply. In systems that alreadyhave a TRANSFORMER, one option is to swap out the existingTRANSFORMER with one that has an additional secondarywinding. The problem with this solution is that manysystems now use TRANSFORMERs that are standard, offthe-shelf components, and most designers want toavoid replacing a standard, qualifi ed TRANSFORMER with acustom version. An easier alternative is to produce thelow negative voltage rail by stepping down an existingnegative rail. For example, if the system already employsan off-the-shelf TRANSFORMER with two secondary windingsto produce ±12V, and a –3.3V rail is needed, a negativebuck converter can produce the –3.3V output from the–12V rail.
介紹了電力操作電源與智能電池巡檢系統(tǒng)的特點(diǎn)，給出了一種基于超低功耗單片機(jī)MSP430 F149針對(duì)中小型變電站自動(dòng)化運(yùn)行的專用設(shè)備的基本設(shè)計(jì)原理及實(shí)現(xiàn)方法，最后給出了詳細(xì)硬件構(gòu)成和軟件實(shí)現(xiàn)。該系統(tǒng)能滿足中小型變電站安全、可靠、自動(dòng)運(yùn)行的要求，并通過與上位機(jī)的串行通信實(shí)現(xiàn)變電站的遠(yuǎn)程管理和控制。
Abstract:
The characters of the intelligent battery data logging system of the electric operation power are introduced.The basic design principle and the implemented methods of the special equipment which only designed for the middle or small TRANSFORMER substation based on MSP430F149 are prescribed. Finally, the hardware block diagram and the software flow chart are also given. The function that the system finally needs to realize can basically meet with the middle or small TRANSFORMER substation’s satisfy, reliably,and automatic running.And it can also realize the TRANSFORMER substation long-distance management and control by serial communicating with the host computer.
