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ELECTRONIC - dc-to-dc-converter

ELECTRONIC

DC5V to DC30V Converter By 74HC14


Here is a power supply which makes about +30V from +5V power supply.

DC5V to DC30V Converter By 74HC14

The direct current is changed into the alternating current by the oscillator which used the schmitt trigger inverter which has the hysteresis characteristic and the resonance circuit. The high DC voltage (+50V) is made with the alternating voltage using the voltage amplification rectification circuit. The output voltage of this circuit changes mainly when the load changes. So, this power supply can be used only as the power supply of the circuit that the load is constant or the circuit which doesn’t have a problem even if the voltage changes.

MC34063A (IC DC to DC Converter) design tool


Today I see to good website for MC34063A (IC DC to DC Converter) design tool.
Intro detail :

MC34063A design tool

MC34063A (IC DC to DC Converter) design tool

This is a simple-minded design tool that allows you to calculate component values MC34063A simple switcher chip. It displays the appropriate scematic diagram (step-up, step-down, or inverting) and checks for current and voltage limits. Feedback resistors are chosen from standard component values so that the output is as close to desired value as possible.

Typical input capacitor value is about 100uH, all electorlytics need to be low ESR types. The fast schottky diode should be sufficent for a current needed, 1N5818, 1N5819, 1N5820 and alike will do just fine.

DC to DC converter step up 4.5V-12V to +15V 0.5A With MAX1846


This is next Good IC DC to DC converter From web http://www.maxim-ic.com.
Read intro Detail Please:

The MAX1846 Circuit

DC to DC converter  The MAX1846 Circuit
The MAX1846 inverting circuit to implement a switch-mode power supply that provides a -15V at 0.5A output from a 4.5V to 12V input. This MAX1846 circuit also adds a few components to the minimum circuit implementation. C20 adds a pole to compensate for the ESR-zero of the output capacitor, while R16 and C22 filter the current-sense voltage to prevent high-frequency switching noise from tripping the current limit. This functionality is in addition to the MAX1846′s internal 100ns current-sense blanking time. The MAX1846 EXT pin implements controlled slew rate, which helps limit high-frequency switching noise.

DC to DC converter step up 4.5V-12V to +15V 0.5A


I Find Circuit DC / DC converter for my friend from internet.
One good site at http://www.maxim-ic.com about IC Very nice for electronics user.
I like many circuit in this site.

DC to DC converter  the MAX668 Circuit

The MAX668 boost circuit to implement a switch-mode power supply that provides a +15V at 0.5A output from a 4.5V to 12V input. This MAX668 circuit adds a few components to the minimum circuit implementation. C7 adds a pole to compensate for the ESR-zero of the output capacitor. R5 and C8 filter the current-sense voltage to prevent high-frequency switching noise from prematurely tripping the current limit. This functionality is in addition to the MAX668′s internal 60ns current-sense blanking time.

The MAX668 output voltage can be changed to +12V by changing the value of the R2 resistor to 86.6k This change reduces the minimum input voltage to approximately 10V. Since the MAX668 provides internal compensation, no other changes are required for +12V output.

The output ripple voltage due to switching can be reduced an order of magnitude with a secondary output filter set to one-tenth of the switching frequency. A 1, 0.5W resistor in series with a 10uF, 25V capacitor with less than 100m ESR introduces a 0.5V decrease in output voltage at a 0.5A load. The feedback voltage must be sensed before it reaches the secondary filter for the MAX668 to maintain stability.

DC/DC Converter DC12V to 24V 2A by IC 40106 and Mosfet BUZ11


This is Circuit DC to DC Converter.
For input DC12V-24V 4A to Output 24V-48V 2A (inputX2) Use easy circuit simple part IC Digital Cmos : 40106 and Mosfet BUZ1.

DC/DC Converter DC12V to 24V 2A by IC 40106 and Mosfet BUZ11 : Circuit DC to DC Converter

If you have power supply source about 12V, from battery 4A sizes. But want to enhance voltage be 24V or about 2 times. This circuit has can to help you by it has prominent easy good point. It use the integrated circuit digital number CD4093 perform produce the frequency drive current change CD40106 bilateral the group trips work. By drive high current with power mosfet BUZ11 make output current collect at capacitors the very total up voltage bilateral the group then is double of Input power supply. or It can enhance voltage double , be 2 times there.
Detail to See Circuit.
Source: CEW circuit Electronics Book

Converter 3.2VDC to 9V-12VDC ( For Solar Charger)


If you require 9v to 12v output, you will need to add the four voltage-regulating components shown in the diagram below.

Converter 9VDC to 12VDC ( For Solar Charger)

The voltage-regulation components added, the circuit produces a 9v or 12v output. This arrangement is only suitable if you have a constant, reliable, source of sun as any clouds will reduce the output to below the regulated voltage. (If a 9v1 zener diode is fitted, the output voltage will be 9v.) The BC 547 prevents the ZXT 851 oscillator transistor turning on when the voltage is slightly above 12v (or 9v). The 10u on the output stores the “reference voltage” and keeps the BC 547 turned on during the time when the output voltage is above 12v. This effectively stops the oscillator, but as soon as the output voltage drops below 12v, the circuit comes back into operation, “charge-pumping” the 10u on the output
The 12v zener works like this: No voltage appears on the anode end (the end connected to the 100R resistor) until 12v is on the cathode. Any voltage above 12v appears on the anode and this voltage passes through the 100R to the base of the BC 547. For instance, if 12.5v is on the cathode, 0.5v will appear on the anode. When the base sees 0.7v, the transistor turns on, so slightly more than 12.7v is needed to turn on the transistor.
The regulation components are not really necessary as a reliable output will only be present when strong sunlight is seen by the solar panel. For the cost of a rechargeable battery or set of rechargeable cells, you get a much more reliable arrangement by removing the regulation components, using the first circuit in the article, and allowing the battery to deliver the 9v or 12v. The battery appears as a HUGE electrolytic on the output, delivering a constant voltage and is capable of delivering a high current.

Simple DC-DC Converter



Simple DC-DC Converter

Have you ever wanted to build a circuit to run off a single 9 Volt battery only to find you needed levels like +12 and -12 Volts? The thought of multiple batteries might have put you off. Why not use a simple DC to DC converter?Just to prove a point, here’s a DC to DC circuit put together just from parts found on the test-bench. All it took was two transistors, two resistors, an audio transformer, a bridge and two caps. It may not be the ultimate in performance, but it does work.

The key to how it works is the transformer. As you can see, two transistors drive the transformer primary with the base drive for each coming from the collector of the other. When power is applied, suppose Q1 turns on a few nanoseconds faster than Q2.

As Q1 turns on two things happen: The Q1 collector voltage drops shutting off Q2, and Q2 collector voltage rises turning Q1 on more. Q1 collector voltage drops due to the inductive reactance of the primary coil.
As current flows through the transformer primary, a voltage is induced in the secondary by the expanding magnetic field in the transformer core. But at some point the magnetic field stops expanding, because either the transistor reached the maximum collector current it could pass or because the transformer core reached the maximum magnetic field it could hold. Either way, the inductive reactance of the primary drops causing the voltage on the collector of Q1 to rise.
Since the collector of Q1 drives the base of Q2, Q2 turns on which in turn shuts off Q1. Now current is flowing the opposite way through the primary causing the magnetic field in the core to reverse itself, which induces an opposite voltage in the secondary which continues until the field stops expanding and the process switches again. Basically, the circuit is a square-wave oscillator.

One 9V battery gives +18, +25, +33V



One 9V battery gives +18, +25, +33V

For you high-voltage minibooster fans out there, here’s the one-chip, one battery way to do it.

The MAX1044 is a charge pump converter - it uses a capacitor as a “bucket” to pump charge from one place to another. Normally, there is a capacitor connected from pin 2 of the 1044 to pin 4. This capacitor is charged between +9V and ground, and then switched in parallel with a capacitor from pin 5 to ground in a way that makes a negative voltage on the second cap.

DC to DC Converter mini Step up Voltage


Here is a DC to DC converter using a standard 12 VAC center tapped power transformer and a single bi-polar NPN transistor….

Here is a DC to DC converter using a standard 12 VAC center tapped power transformer and a single bi-polar NPN transistor. 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. The circuit draws about 40 milliamps and should operate for about 200 hours on a couple of ‘D’ alkaline batteries. Higher voltages can be obtained by reducing the 4.7K bias resistor.

DC to DC Converter mini Step up Voltage

MAX756 2.5V-3.5V to 5V Step-Up DC-DC Converter


Build a circuit to boost the voltage of a DC power source using a MAX756 IC Chip
A DC voltage booster, DC voltage multiplier, or DC-DC Step-Up Converter is a very useful tool which enables a low source DC voltage to be boosted (stepped up) to a higher output DC voltage which is more useful.

MAX756 3.3V/5V Step-Up DC-DC Converter

For example, ultrabright LEDs need a 2.5-3.5 Volts to light: even two AA rechargeable batteries in series (1.2 + 1.2 = 2.4V) would not provide sufficient voltage to light up LEDs. Using a voltage boost circuit an LED can be powered by just one AA battery or any other power source – sometimes down 0.7 Volts!

This circuit can be used with low voltage solar panels to make a small battery charger or to power a 5 Volt device directly. It is also particularly good for getting useable voltages from small DIY stepper motor wind turbines – again to charge batteries or light LEDs.

Inverts to Negative From Positive Voltage by IC 555


This simple circuit is a good solution to the powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and inverts it. It uses only one 555 timer and a few other passive components, so it doesn’t add much in the way of size and cost to a project.

Voltage Inverter by IC 555

Substitutions
R1 1 24K 1/4 Watt Resistor
R2 1 56K 1/4 Watt Resistor
C1 1 3300pF 25V Ceramic Capacitor
C2 1 47uF 25V Electrolytic Capacitor
C3 1 10uF 25V Electrolytic Capacitor
D1, D2 2 1N4148 Silicon Diode
U1 1 555 Timer
MISC 1 Wire, Board

DC to DC step down voltage regulator by IC LM2575 (1A)


DC to DC step down voltage regulator by IC LM2575 (1A)

DC to DC step down voltage regulator.

Wide input voltage 8Vdc to 40Vdc.

Part number:

- LM2575-3.3 (3.3Vdc output)
- LM2575-5.0 (5Vdc output)
- LM2575-12 (12Vdc output)
- LM2575-15 (15Vdc output)
- LM2575-ADJ (1.23Vdc to 37Vdc output)

DC to DC converter step up voltage by 40106



This circuit uses bog standard parts, without requiring a magical “do-it-all” IC. You can make an ultra simple 1.5v to 9v regulated stepup converter by using a TL496 IC, a coil and a capacitor, but that’s not so much fun if you want to experiment. I’ve already built a TL496 based circuit so I started doing web searches for something that I could make that would allow more fiddling and a wider range of applications.

DC to DC converter step up voltage by 40106

DC12V to DC28V Converter with LM2585


This circuit is boost regulator,
input volt DC12V for output DC28V (28v relay)
The circuit is built around the LM2585,
and uses the energy stored in an inductor to boost the 12v to 28.
The circuit does it’s switching around 100 Khz,
but generates no noise if SMT components are used.

DC12V to DC28V Converter with LM2585


Note

1. A short-circuit on the output will kill U1 and D1. Always use a 1 ohm 5w resistor,
or a 2.5A fast fuse on the 12v input lead.
2. Do not omit the LED (D2); It provides a visual indicator of a properly operating boost condition,
but more importantly, it also provides a minimum load for the output,
preventing an output “spike” which will otherwise
appear when the load is disconnected abruptly.

3. Keep the ratio of r2 and r3 to 22 or less to keep the output voltage
within the ratings of C4 (C4 on my board is rated at 35wvdc).
This ratio plus 1, multiplied times 1.25v, determines the output voltage.

The Output Adjustable Flyback Converter

This circuit may also be downloaded in PDF format, please click here.

The Output Adjustable Flyback Converter

Description:
A high voltage step-up DC power supply using adjustable flyback conversion.

Specification:
Vin = 220Vac +-10% @ 50/60Hz
Vout =0~600Vdc @ 0.25A
Switching Frequency: 70~100KHz

fig 1

Design Guidelines:
DCM mode, output power is 200W

The input RMS current in worse condition with discontinuous current mode may be calculated as:

eqn1.gif
If the optimum operating duty cycle is set at D=0.35, then input peak current can be found as:

eqn2.gif

Therefore the voltage sensing limit voltage level from the FAN7554 data sheet is 1.5V

6V to 12V Converter by transistor


This inverter circuit can provide up to 800mA of 12V power from a 6V supply. For example, you could run 12V car accessories in a 6V (British?) car. The circuit is simple, about 75% efficient and quite useful. By changing just a few components, you can also modify it for different voltages.

6V to 12V Converter by transistor

Notes
1. L1 is a custom inductor wound with about 80 turns of 0.5mm magnet wire around a toroidal core with a 40mm outside diameter.
2. Different values of D3 can be used to get different output voltages from about 0.6V to around 30V. Note that at higher voltages the circuit might not perform as well and may not produce as much current. You may also need to use a larger C3 for higher voltages and/or higher currents.
3. You can use a larger value for C3 to provide better filtering.
4. The circuit will require about 2A from the 6V supply to provide the full 800mA at 12V.