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Converters:
Voltage
Power
Supplies -- Main Page
Converters -- Main Page
Voltage Converters: #-B
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Last Updated on:
Wednesday, June 02, 2021 01:44 PM
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Circuits Designed by Dave Johnson, P.E. : |
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Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students &
inventors:
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C Volt Ranger
transforms a0-5-Volt input voltage to a
adjustable range between0-10-Volt (added 4/02) |
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Capacitor improves efficiency in CPU supply
4-Apr-02 Issue
of EDN High efficiency is important for the dc/dc buck
converters that supply high currents in notebook PCs. This
efficiency extends battery life.. [Design Idea by Masami Muranaka,
Maxim Integrated Products, Tokyo, Japan] |
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Charge pump converts –5V to 5V
20-Jan-05 Issue of EDN
Versatile switched-capacitor charge-pump voltage converters can
provide a negative supply voltage from a positive-voltage source or
double a positive source's voltage.. [Design Idea by Ken Yang,
Maxim Integrated Products Inc, Sunnyvale, CA] |
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Charge Pump Converts Volt in to ± Volt Out
02-Sep-99 Issue
of EDN A charge-pump IC's ability to produce both VIN and
-VIN outputs allows the circuit in Figure 1 to generate separate
positive and negative outputs from.. [Design Idea by Ioan Ciasci,
Rei Data, Cluj-Napoca, Romania] |
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Charge Pump Efficiently Divides Supply Voltage
This circuit uses
a few FETs and logic devices to down convert a DC voltage to about one half
its value …. [Designed by David A. Johnson] |
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Charge-pump circuit divides by two
02/18/99 Issue of EDN
Small size and efficiency approaching 100% make switched-capacitor charge
pumps popular for voltage doubling and inverting in miniature dc-dc
applications. Few are aware, however, that most charge pumps can halve as well
as double or invert an input voltage. The increasing adoption of low-voltage
logic makes this ÷2 capability useful for generating low-voltage supplies in
portable.. Page includes
several designs. Scroll to find this one..
[Design Idea by Budge Ing, Maxim Integrated Products, Sunnyvale, CA] |
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Chinese Translation: Design Guidelines for Off-line Flyback Converters using
FPS/ AN-4137SC
Fairchild Application Notes / (app note added 6/06)
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Circuit forms single-pulse voltage multiplier
18-Sep-03 Issue of
EDN It is sometimes necessary for a microcontroller to generate a pulse
whose voltage is higher than the power-supply voltage of the microcontroller.
The circuit in Figure 1 allows you to generate 14V pulses from a 5V power
supply. An adaptation of the circuit provides a 5 to 12V programming pulse for
programming the fuse bits in Atmel (www.. [Design Idea by Richard Cappels,
Mesa, AZ] |
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Circuit provides leading-edge blanking
29-May-03 Issue of EDN
In isolated switch-mode power supplies using peak-current-mode control,
generally the current-sense resistor senses the current on the primary side of
the power converter. Figure 1 shows a typical circuit, in which R2 is the
current-sense resistor that monitors the current. The current-sense signal
goes to the input of the PWM comparator—in this case, the PWM comparator's
input (ISENS.. [Design Idea by Michael O'Loughlin, Texas Instruments,
Dallas, TX] |
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Circuit translates I2C voltages
26-Dec-02 Issue of EDN This Design
Idea explores level-shifting an I˛C bus from 5V/ground (positive domain] to
ground/25V (negative domain]. In multisupply systems, you sometimes face a
situation in which digital information stored in logic circuits running from
5V to ground needs conversion to analog signals referenced to a negative
supply.. [Design Idea by Peter Liu, Optron X, Allentown, PA] |
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Constant-on-time buck-boost regulator converts a positive input to a negative
output
7-Dec-04 Issue of EDN Buck regulators find wide
application as step-down regulators for converting large positive input
voltages into a smaller positive output voltages. Figure 1 shows a simplified
buck regulator that operates in continuous-conduction mode—that is, the
inductor current always remains positive. The output voltage, VOUT, is equal
to D×VIN, where D is the duty-cycle ratio of the buck switc.. [Design Idea
by Robert Bell, National Semiconductor Inc, Chandler, AZ] |
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Convert voltage to potentiometer-wiper setting
5-Sep-02 Issue of
EDN The circuit in Figure 1converts an analog input voltage, VIN, to a
proportional wiper setting of a DPP (digitally programmable potentiometer].
The potentiometer's wiper setting, which varies from position 0 through 31,
corresponds to the input voltage, which varies from 0 to 1V dc. The CAT5114,
IC5, is a 32-tap potentiometer with an increment/decrement interface..
[Design Idea by Chuck Wojslaw, Catalyst Semiconductor, Sunnyvale, CA, and
Chris Wojslaw, Conexant Systems, Newport Beach, CA] |
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DC to DC Converter
The circuit below is a DC to DC converter using
a standard 12 VAC center tapped power transformer wired as a blocking
oscillator. The circuit is not very efficient but will produce a high voltage
usable for low power applications. The input battery voltage is raised by a
factor of 10 across the transformer and further raised by a voltage tripler
consisting of three capacitors and diodes connected to the high voltage side
of the transformer.. [Bill Bowden] |
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DC Voltage Multiplier Circuit Plans
Build a circuit to boost the
voltage of a DC power source using a MAX756 IC Chip…. [REUKRenewable Energy
UK website] |
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DC/DC Converter operates from Phone Line
01/15/98 EDN-Design
Ideas.....DC/DC converters for use inside the telephone handset require
operation from the high-source-impedance phone line. Additionally, the CCITT
specifications call for maximum on-hook power consumption of 25 mA. The dc/dc
converter in Figure 1 is 70%-efficient at an input power of 25 mA, providing
5V at 3.4 mA. Controlled, low-peak switch.. [Design Idea by Gary Shockey,
Linear Technology Corp, Milpitas, CA] |
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Diodes improve inverter efficiency
04/29/99 Issue of EDN In
"Switched-capacitor regulator provides gain" (EDN, March 13, 1998, pg 80] a
switched-capacitor voltage inverter wired as a supply splitter steps a
positive voltage down to an output voltage equal to half the supply voltage.
The input current to such a circuit is one-half the output current; thus, you
obtain higher efficiency and lower power loss than you would from a linear
regulator performing the same function. You can obtain the same benefits while
inverting the input voltage.. Page includes
several designs. Scroll to
find this one.. [Design Idea by Jeff Witt, Linear Technology Corp,
Milpitas, CA] |
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Discrete LDO Voltage
RegulatorDo you need a simple LDO voltage regulator, but an IC
version that meets your needs is not available? Make your own using this
circuit. The circuit in the drawing is the actual circuit that I built
and used successfully to power a shortwave radio which I have since sold (with
the power supply)...[Designed by Andrew R. Morris] |
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Doozy requiring some parts you can't get at the 'Shack.
You can
make a doozy of a xenon strobe using the 12 volt DC in,….. |
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Driving High Power LEDs
AN-703 Analog Devices Application Note
(app note added 2/06) |
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Power Supplies -- Main Page
Converters -- Main Page
Voltage Converters: #-B
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