15.05.2014

Dcdc boost converter instructables

The device was made in a one-sided PCB with the use of USB to create a high quality preamplifier with built-in DAC. This small and simple circuit allows you to connect your VGA card to your TV via SCART with the great advantages of using RGB over S-Video.
Today, although the wireless technology grows very fast, the long distance funicular communication still keeps its popularity.
Description This is a 5V to 12V DC-DC step-up (boost) converter circuitry that is especially ideal for the USB powered applications. Energy harvesting with a photovoltaic cell requires an efficient dc-dc converter that operates with very low voltage inputs and whose output can charge an external battery.
Current Logic is expert of DC-DC converter, boost converter, 24v to 12v converter, 12v to 5v converter. When applications cannot be fulfilled from our standard product range, our experienced R&D teams are ready to work with you to find solutions and develope new products. Being compact size, reliable and low cost, CPT series have been well received for long time. There are so many kinds of DC-DC Converters (DC voltage regulator) in the market for you to choose from.
Facing so many potential choices, you need some basic criterias to help you find suitable dc-dc converter from plenty of OEM, wholesaler and retailer. As a professional dc dc converter manufacturer, we also provide a wide selection of DC-DC converter for electronic vehicle. Boost converters or regulators are used in many instances from providing small supplies where higher voltages may be needed to much higher power requirements.
Often there are requirements for voltages higher than those provided by the available power supply - voltages for RF power amplifiers within mobile phones is just one example. The circuit for the step-up boost converter operates by varying the amount of time in which inductor receives energy from the source. Typically the boost converter switch is controlled by a pulse width modulator, the switch remaining on of longer as more current is drawn by the load and the voltage tends to drop and often there is a fixed frequency oscillator to drive the switching.
When the switch is in the ON position, the inductor output is connected to ground and the voltage Vin is placed across it. When the switch is placed in the OFF position, the voltage across the inductor changes and is equal to Vout-Vin. Referring to the boost converter circuit diagram, the current waveforms for the different areas of the circuit can be seen as below. It can be seen from the waveform diagrams that the input current to the boost converter is higher than the output current. In reality no boost converter will be lossless, but efficiency levels of around 85% and more are achievable in most supplies. The reason is obvious that cost and complexity is high at the wireless communication.RS232 is one of the most used, easy to develop and easy to apply communication protocol. They are economical options for commercial and industrial applications like robotic, golf carts, LED lighting etc.
For example a dc-dc converter 12v to 24v search on internet will generate more than 100,000 results.
Current Logic now introduce a selection of waterproof LED drivers, both constant current and constant voltage power supplies are available.
These output adjustable dc-dc converters are usually open-framded unit for prototyping or experement work.
These reliable LED power supplies can help you quickly design and realize your LED products. The fundamental circuit for a boost converter or step up converter consists of an inductor, diode, capacitor, switch and error amplifier with switch control circuitry.


This eliminates the need to for an ac power line-based recharging circuit, which may be impractical in a remote application.
Typically, these applications require very low average power, but can require periodic pulses of higher load current.
From this it can be seen if the output voltage is higher than the input voltage, then the input current must be higher than the output current. Good wiring, low baud rates and less noisy mediums may allow us to exceed this limit a little more.
The Linear Technology LTC3105 is intended for these types of energy harvesting applications. The main problem here , when the distance increases, the noise at the common ground line also increases. More than two devices can not communicate at this line and we need another solution for this situation.RS485 is the standard that solves this problems. The main difference is,  RS485 transfers the data depending on the potential difference between the two communication wires. An integrated maximum power point controller (MPPC) optimizes performance from photovoltaic (PV) cell inputs.
The LT3105's 3mm ? 3mm DFN package (or MSOP-12) and very small external components offer a compact solution for energy harvesting. Burst Mode, with proprietary self-adjusting peak current, optimizes converter efficiency and output voltage ripple over all operating conditions. You can adjust the LDO with a voltage divider consisting of a resistor from the LDO pin to FBLDO then another resistor to GND. As an alternative, you can connect the FBLDO pin to GND to deliver a nominal 2.2V output for the LDO. An optional 22pF feed-forward capacitor from VOUT to FB (paralleling the 1020 k? resistor in Fig. However, continuous operation above the specified maximum operating junction temperature may impair reliability.
This aids PV cells that can become overloaded if inrush current is not limited during power converter start-up.
In addition, output disconnect isolates VOUT from VIN while in shutdown, resulting in 4µA quiescent current. This pin incorporates an internal 2M? pull-up resistor, which enables the converter when not controlled by an external circuit. At low system voltages (VIN and VAUX), the shutdown pin thresholds are as low as 50mV from the voltage rails.
Once VAUX reaches approximately1.4V, the converter leaves start-up mode and enters normal operation. Maximum power point control is not enabled during start-up, however, the currents are internally limited to sufficiently low levels to allow start-up from weak input sources.
While the converter is in start-up mode, the internal switch between AUX and VOUT remains disabled and the LDO is disabled. After ending the shutdown event, the LDO remains in reverse-blocking mode until VAUX rises above the LDO voltage.
If VAUX becomes higher than required to maintain LDO regulation, charge is transferred from the AUX output to the VOUT output.
If VAUX falls too low, current redirects to the AUX output, instead of being used to charge the VOUT output.
Once VOUT rises above VAUX, the IC enables an internal switch to connect these two outputs together.
This switch remains on until inductor current drops below the valley current limit and the cycle is repeated.


When VOUT reaches the regulation point, the N- and P-channel MOSFETs connected to the SW pin are disabled and the converter enters sleep. 1), MMPC prevents the PV cell input voltage from collapsing below its programmed threshold.
Peak current limits are automatically adjusted with proprietary techniques to maintain operation at levels that maximize power extraction from the PV cell. The MPPC circuit dynamically regulates the average inductor current to prevent the input voltage from dropping below the MPPC threshold.
When VIN is greater than the MPPC voltage, inductor current increases until VIN is pulled down to the MPPC set point. If VIN is less than the MPPC voltage, the inductor current is reduced until VIN rises to the MPPC set point. For more information, see the sidebar “Maximum Power Point Control For A PV Cell.” In PV cell applications, a diode can be used to set the MPPC threshold so that it tracks the cell voltage over temperature. If the selected diode forward voltage is too low, a resistor in series with the diode can adjust the dc set point to better match the maximum power point of the PV cell. If the diode is located far from the converter inputs, a capacitor may be required to filter noise that may couple onto the MPPC pin. This method can be extended to stacked cell sources through use of multiple series connected diodes.
Lowering peak inductor current to 100mA at light load optimizes efficiency by reducing conduction losses.
As the load increases, the peak inductor current automatically increases to a maximum of 400mA. This function is overridden by the MPPC and only occurs when the PV cell delivers more power than the load requires. PGOOD indicates that power is good at the beginning of the first sleep event after the output voltage has risen above 90% of its regulation value.
PGOOD remains asserted until VOUT drops below 90% of its regulation value at which point PGOOD goes low. To minimize output capacitor discharge in such cases, the LTC3105 incorporates undervoltage lockout (UVLO) that forces the converter into the shutdown mode if the input voltage falls below 90mV (typical). In shutdown, the switch connecting AUX and VOUT is enabled and the LDO is placed into reverse-blocking mode and the current into VOUT is reduced to 4µA (typical).
To minimize discharging of the output, the IC limits reverse current through the LDO to 1µA in shutdown.
In applications where the input voltage is very low, a larger value inductor can provide higher efficiency and a lower start-up voltage. If the inductor dc resistance is too high, it will reduce efficiency and increase the minimum operating voltage. For high impedance PV cells, the input capacitor should be large enough to allow the converter to complete start-up mode using the energy stored in the input capacitor. When using bulk input capacitors that have high ESR, a small valued parallel ceramic capacitor should be placed between VIN and GND as close to the converter pins as possible.
When using output bulk storage devices with high ESR, a low value ceramic capacitor should be placed in parallel and located as close as possible to the converter pins. The voltage at which PV cell produces maximum power depends on solar radiation, ambient temperature and PV cell temperature.
Typical PV cells produce power with maximum power voltage of around 17 V when measured at a cell temperature of 25°C, it can drop to around 15 V on a very hot day and it can also rise to 18 V on a very cold day.



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