Tharks

Electronic Ballast Schematic Simulated

2009-11-02T09:05:00.000-08:00

Electronic Ballast Output and Drive Waveforms (Torroid).

2009-11-02T09:01:00.000-08:00

Electronic Ballast Output and Drive Waveforms (Torroid).

Electronic Ballast Output Waveforms

2009-11-02T08:50:00.001-08:00

First is half bridge output and following is waveform across tube.

VIENNA RECTIFIER Schematic

2009-11-02T04:45:00.001-08:00

VIENNA RECTIFIER INPUT CURRENT AND VOLTAGE

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VIENNA RECTIFIER INPUT CURRENT

2009-11-02T04:40:00.000-08:00

VIENNA RECTIFIER PWM1

2009-11-02T04:37:00.000-08:00

VIENNA RECTIFIER PWM2

2009-11-02T04:33:00.000-08:00

DC AC CFL Inverter Schematics

2009-11-02T03:49:00.001-08:00

Battery powdred CFL Inverters are widly used in solar lighting emergency lighting and automobile lighting. The schematics we are working out is a popular DC AC inverter widly used in general battery powdered applications as well as used in Electronics Ballast where Line Voltage is Less(110V AC as in US). This basicaly push pull current fed parallel resonant self oscilating inverter. The inductor L1,L2 and reflected impedance of C1 forms LC tank circuit.
L4 will source current while giving maximum impedance to higher harmonics. R2, L5, L6 provides base drive. You can note primary rms voltage is 1.1 times of battery voltage because L4 act as boost inductor. Both switches are working in ZVS. Out put is pure sine wave. Load power dissipation is 9W. But Tank circulating power is arround 80W.

DC AC CFL Inverter Output Waveform

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DC AC CFL Inverter Input Waveform 2

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DC AC CFL Inverter Input Waveform 1

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12 Pulse Rectifier Schematics

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12 Pulse Rectifier Schematics

12 Pulse Rectifier Input Voltage

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12 Pulse Rectifier Input Voltage

12 Pulse Rectifier Input Current

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12 Pulse Rectifier Input Current

12 Pulse Rectifier Out Put

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12 Pulse Rectifier Out Put

Three phase six pulse converter

2009-08-23T05:24:00.001-07:00

Three Phase Six Pulse Converter Controll Circuit

2009-08-23T05:13:00.000-07:00

Circuit diagram of three phase six pulse converter with current and voltage feedback is given above. Out put stage is capable of driving 250 amps 1800V SCR. If we reduce gate series resistor to 22 ohm we can drive 800 amps SCR. This converter is well suited for power level upto 250 KW

Tripple Conversion UPS Charger

2009-08-23T02:53:00.000-07:00

Charger Circuit

Tripple Conversion UPS Output Filter

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Output RFI Filter

Tripple Conversion UPS Bias Supply

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Bias Power Supply

Tripple Conversion UPS Controll Circuit

2009-08-23T02:47:00.000-07:00

Cntroll Circuit

Tripple Conversion UPS Power Circuit

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Power Circuit

Solar Panel Price

2009-08-22T02:45:00.000-07:00

panel price
$1.85/W solar panels! Free Solar Panel Survey
www.ecobusinesslinks.com/solar_panels.htm
http://www.atensolar.com/14.html

PV Technology, Production and Cost, 2009 Forecast

2009-08-22T00:58:00.000-07:00

Good news
http://www.gtmresearch.com/report/pv-technology-production-and-cost-2009-forecast/

Electronic Earth Leakage Circuit Breaker

2009-06-12T21:24:00.000-07:00

Differential CT is used to sense earth leakage current. Out put current of Differiantial CT will be difference of Phase current and Neutral current divided by turns ratio. This current is fed to current to voltage converter. One variable resistor is provided in the fee back path to audjest sensitivity. This signal is full wave rectified and given to relay driving circuit with a small delay.

SCR is used as relay drive for latched operation. Push to on switch is used for resetting the circuit. Test switch is used to check the working of the circuit by creating a artificial leackage current of 20mA. Another good referance design from Fairchild Semiconductor http://www.fairchildsemi.com/ds/RV%2FRV4141A.pdf

Electronic Transformer

2009-06-07T23:05:00.000-07:00

Matix converter can be used with a high frequency ac link to make low frequency transformer.

The circuit presented here uses MOSFET as switches and EE70 ferrite core transformer as AC link. Transformation ratio is directly prepotional to turns ratio of EE70. If EE 70 have 1:1 turns ratio the curcuit will act as 1:1 isolation transformer. The main adventage of this topology is its low frequency response. We can use this electronics transformer DC to 200Hz.

LOW COAST MOSFET GATE DRIVER CIRCUITS

2009-06-07T09:09:00.000-07:00

1KW PHASE SHIFTED SMPS

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1KW ZVS SMPS REFERANCE DESIGN www.microsemi.com/micnotes/APT9703.pdf

Multi Level Inverter

2009-06-06T04:39:00.000-07:00

Multi Level Inverters are used to produce fine pwm wave forms with muliple voltage steps. It uses one or more power sources and multiple power switches. Main adventage of multilevel inverter is low switching component at output which will reduce the output filter components.
Multilevel inverters have very low switching loss but conduction losses are high. Another adventage is reduced voltage requirment of switching devices. The circuit given below is a three level inverter.The power supply is + - 400V connected as dual polarity bus ie 800V. Four 600V IGBT switches are connected in series and center point is taken as output. The levels are defined by shifting triangle wave above and belo GND (0V). 6V amplitude 50 hz sinewave is the input signal which is reproduced as 385V at output.Out put pwm have three levels 0V +400V and
-400V

Circuit of Multi Level Inverter

Input Sine Wave and level shifted Triangle Wave

PWM gate waveforms

PWM Out Put and Final Out Put

Have nice day

Regenerative Loading of Inverters

2009-03-27T01:30:00.000-07:00

This is the popular loading method for high power inverters. The inverter is configured as current mode inverter and referance sine wave is generated from utility.The referance amlitude is audjested for variying load.If we load 100KVA online ups full load we need only the power loss which will happen in UPS.Ie if efficiency of ups is 95% we need only 5KW from line to load full 100KW.

Next generation power devices

2009-03-11T07:56:00.000-07:00

http://www.cree.com/products/power_docs.asp

best power electronics links

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http://sureshks.netfirms.com/article/articles.htm
http://www.ivobarbi.com/zstart.php

APC UPS Circuits

2009-03-11T07:32:00.000-07:00

for APC UPS circuits
http://www.eserviceinfo.com/equipment_mfg/APC_23.html
for service manuals
http://www.eserviceinfo.com/browse.php

Unipolar PWM

2009-03-08T06:21:00.000-07:00

Uni Polar PWM

Basic circuit of unipolar sinewave PWM

sine wave referance triangle wave and PWM waveforms

sine triangle and output

Bipolar PWM

2009-03-08T06:11:00.000-07:00

Following is the basic circuit of bipolar PWM and its waveforms

circuit diagram

Waveforms of this circuit

triangle wave sine wave and PWM output

PWM and Output

Sinewave triangle wave and output

90V to 500V AC SMPS

2009-03-07T05:51:00.000-08:00

here is the circuit of 90V to 500V ac input power supply with battery backup.

Or u can call dc UPS

Line Interactive UPS schematics

2009-02-09T04:55:00.000-08:00

Schematics of line interactive UPS

Active Power Factor Correction

2009-02-08T12:49:00.000-08:00

Useful links on Active Power Factor Correction
Power Factor Correction Handbookhttp://www.onsemi.com/pub/Collateral/HBD853-D.PDF
UC3854 Controlled Power Factor Correction Circuit Designhttp://www.ti.com/litv/pdf/slua144
Optimizing Performance in UC3854 Power Factor Correction Applicationshttp://www.ti.com/litv/pdf/slua172
UC3854A and UC3854B Advanced Power Factor Correction Control ICs (Rev. A)http://www.ti.com/litv/pdf/slua177a
Improved Power MOSFETS Boost Efficiency IN A 3.5kw Single Phase PFChttp://www.microsemi.com/micnotes/APT0101.pdf
Optimizing the Design of 3.5kw Single-MOSFET Power Factor Correctorshttp://www.microsemi.com/micnotes/APT9901.pdf

Solid State Servo Buck

2009-02-08T09:31:00.000-08:00

Block Diagram of AC Static PWM Buck Automatic Voltage Regulator

Solid State Servo Boost

2009-02-08T09:21:00.000-08:00

Block diagram of Static PWM boost servo stabilizer

Battery Powered CFL Inverter Flyback

2009-02-08T08:06:00.000-08:00

Circuit of popular Battery powered CFL inverter using flyback out put stage.
It is the lowest component count and coast but will fail at no load (tube disconnected).

DC AC CFL Inverter Push Pull

2009-02-05T05:06:00.000-08:00

Parallel resonant current fed push pull inverter for battery powered lighting applications. It uses capacitor C3 for preheating and electrostatic shield for tube starting.

SMR

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DC AC CFL Inverter with preheating

2009-02-05T05:05:00.000-08:00

Parallel resonant current fed push pull inverter with preheated staring with out the help of electrostatic shield for battery powered lighting applications.No load protection is also provided.

AC voltage sensing circuit

2009-01-28T20:09:00.000-08:00

This circuit is used to sense ac line voltage with out using transformer and gives very low leackage current while circuit ground can be connected any potential.test

2009-01-22T10:36:00.000-08:00

http://docs.google.com/Presentation?id=d5w5hmf_2hd2v8cgk

40W Electronics Ballast

2008-12-02T14:53:00.001-08:00

Here is the very popular electronics ballast.

5W SMPS

2008-12-02T14:15:00.001-08:00

5W SMPS using descrete components

10W SMPS

2008-12-02T14:13:00.001-08:00

10W SMPS using descrete components
Voltage feedback and current limit is provided

50W SMPS using Fly Back Topology

2008-12-02T14:08:00.000-08:00

50W SMPS using UC3842

300W SMPS

2008-12-02T14:02:00.001-08:00

300W SMPS using TL494

The given circuit is based on popular PWM control circuit TL494. The beauty of the circuit lies in the free self start like using self oscillation and secondly the prepotional base drive to transistors. Magnetic amplifier is used in one out put for cross regulation.

Variable Frequency Three Phase Sine Wave Generator

2008-12-02T13:52:00.000-08:00

This is a simple three phase sine wave generator circuit using switched capacitor filter. The input to switched capacitor filter is three phase square wave which is generated using flip flop logic driven by a ring counter. The input of ring counter is given by a PLL which is used for frequency and phase Synchrnisation. There is a feed back for controlling output ampliude by controlling square wave amplitude to switched capacitor filter.

Phase Shifted ZVS SMPS Descrete Circuit

2008-12-02T13:38:00.000-08:00

This is a classic implimentation of phase shifted zero voltage switching smps usind descrete ICs.

Controll circuits implemented here is same as popular IC UC3875. Feed back is provided for both current and voltage for constant current current constant voltage application. Isolated outputs are provided using pulse transformer for driving MOSFET or IGBT. Fault current trip is also provided for protection appart from constant current limitting

High Frequency Isolated Inverter

2008-11-29T20:26:00.000-08:00

Here provided circuit and PCB details of High Frequency Isolated 50HZ Inverter. It uses ferrite core transformer for voltage boost and isolation. Battery voltage is boosted using high frequency ferrite core transformer driven by MOSFET pushpull stage. The out put of ferrite core transformer is rectified to produce 300V DC. This voltage is converted to ac 230V using out put full bridge MOSFET.

Unified Power Quality Controller

2008-03-29T05:30:00.001-07:00

Unified Power Quality Controller
Unified Power Quality Controller is the final answer for your power quality problems. It will provides voltage stabilization and harmonic correction for voltage wave form and corrects power factor to unity including non linear current waveforms. Basicaly it uses two PWM four quadrant inverters for power quality corrections. One delta inverter of small capacity in series for voltage regulation and voltage waveform harmonic correction and one full rated inverter connected in parallel for power factor correction and current harmonic correction for non linear loads. Both inverters are connected to a common DC link voltage.
The proposed topology is tested using pspice and found satisfactory. Hardware implimation is going on. I will publish hardware details soon.

Solar Street Light

2008-03-29T03:32:00.001-07:00

Solar Street Light Circuit

This is a circuit of solar street light which will power 11W CFL. The circuit uses series switch charge controller for battery charging. Current fed parrallel resonant push pull inverter is used as inverter for CFL. Relay is used for preheated start up of lamp to increase lamp life. Battery deep discharge protection is provided for protecting battery.

Off grid Solar Inverter with Charge controller

2008-02-23T00:03:00.000-08:00

Sun the source of our energy.

Thanks for solar photovoltaics - We fight all the possible ways against global warming.
This is a series of solar projects first solar charge controller followed by inverter, solar lantern, solar street light, solar domestic light and many more
Solar Charge Controller
This is a shunt solar charge controller. Unlike other solar charge controllers this charge controller put battery in float when it is fully charged which will give more back up time and increase battery life
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