Mains Voltage Stabilizer Circuits

 Mains-Power  No Responses »
Jun 082009
 

Mains Voltage Stabilizer Circuits

These circuits were drawn for a person in Africa. See the thread here… stabilizer circuit. They were not tested by me, but are quite close to a practical design.

Stabilizer Step up 230V AC 500VA

This circuit is a design i did, not tested by me as yet. It can Stabilize Mains voltage to around +/- 10% . It can be used for both 110V AC or 220V AC inputs with modifications. The Output is 220V AC. There is an overload, under voltage and over voltage trip circuit. With some tweaks and modifications it might work.

Solid-State Stabilizer Step up 110V AC

This circuit is a design concept, not tested by me and i did it just to explain some ideas. The circuit uses opto-coupler MOC3041 of Motorola and the Triac BTA-16-600 of ST as a solid state switch or relay. It also uses the LM324 quad opamp from National Semiconductor which is low power and single supply. As the MOC3041 switches the Triac at zero crossover there is no inter-winding short of transformer on crossover hopefully, the control circuit is designed in such a way that more than one triac will not be turned on at a time, i would like you to give feedback.

 Posted by admin at 1:17 PM

2N2646 based Voltage controlled SCR Pulser

 Mains-Power, Power-Supplies  No Responses »
Oct 152008
 
2N2646 based Voltage controlled SCR Pulser

A Center tap 50Hz Step Down Transformer with two diodes is used to get a train of Positive Sine Pulses at 100Hz which is applied to Q6 base via R51. 2N2646 is a unijunction transistor(UJT) in a TO-18 metal package. The control voltage or voltage proportional to error is fed to R56-Q3, The UJT drives a pulse transformer which provides isolation from the Load which the SCR bridge is controlling. This phase angle control gives a near Linear closed loop control for a SCR bridge which may be used in Electroplating or a Preregulator of a big power supply.

 Posted by admin at 3:30 AM  Tagged with:

AC-AC-SSR Solid State Relay

 Mains-Power, Solid-State-Relay  No Responses »
Jul 032008
 
AC-AC-SSR Solid State Relay

This is a AC Control Input AC Output SSR Solid State Relay. When a Process Controller has an AC output or a system generates an AC signal of above 100V AC to signal the load to turn on, this device can be used. A BTA40-600 and MOC3041 are used in this. A high voltage plastic cap limits current to a bridge which generates a small DC from 230 V AC, this drives MOC3041. The rest is the same. It is better to use a DC control SSR where possible. This AC control SSR is used where only an AC control Read More …

 Posted by admin at 6:55 AM  Tagged with:

Normally Closed AC SSR

 Mains-Power, Solid-State-Relay  No Responses »
Jul 032008
 
Normally Closed AC SSR

This is a Normally Closed PCB Mount SSR. That means when DC Control input is low, the triac is ON, the output passes the load current to turn on small heater-motor-lamp or a bigger contacter-drive etc. When input DC is high the output is OFF. This is also Optically Isolated from Mains. A Microcontroller output which is buffered by some driver can drive this relay. It is better that in big systems these SSR Modules can be on another PCB, to avoid mains wiring near Logic circuits. But this cannot be used for medical electronics, or critical applications. More reliability Read More …

 Posted by admin at 3:38 AM  Tagged with:

EMI RFI Mains Filters

 Mains-Power  No Responses »
Jun 022008
 
EMI RFI Mains Filters

EMI RFI Filters are required in two situations, to prevent EMI from an Electronic Equipment Like A Dimmer, Thyristor Drive, SMPS or Switcher affecting other Modules in a System or Neighboring Equipment. The Second Situation is when a Sensitive Equipment Like a Medical Apparatus or Precision Measuring Instrument has to be Immune to any Noise from outside, as it can affect performance. Sometimes it is Accuracy that can get affected, but some electrical jolts can damage or desensitize fine sensors or positioning systems. On the right you can see a Filter that i used to make long ago, This is Read More …

 Posted by admin at 6:04 AM

Flashing Mains Neon Lamp

 Discrete-Circuits, Mains-Power  No Responses »
Apr 102008
 
Flashing Mains Neon Lamp

Here is a Neon Flasher circuit (untested) for a user request at Elex Quna. This can be built into a switchboard or a gadget for indicating Live Power. D1-C1 form a simple half-wave rectifier, The Cap charges to peak voltage and can store charge for a long time if there is no bleeder. So while building it take extra care. This forms a DC supply across C1. C1 is a Plastic High-voltage cap, IN4007 has a 1KV rating, so it is ok for 230V rectifier. R1 Charges C2 and when C2 reaches 60-80V depending on Neon, the neon breaksdown. C2 Read More …

 Posted by admin at 4:59 PM

Tubelight Electronic Choke

 Lighting-Circuits, Mains-Power  2 Responses »
Oct 122006
 
Tubelight Electronic Choke

This is an electronic choke for a Conventional Fluorescent Lamp. This was an application note of MJE13005 a High Voltage Switching NPN Power Transistor. I Might have modified it. This was very popular in the early days, The Coil Winding and Ferrite is very Critical design. The diodes, npn transistor and caps are high voltage 350V-1KV, The tubelight is 40W-60W 5 feet long. This circuit replaced the choke and starter in an existing frame. Read More. Fluorescent Lamp Ballast Electronic Ballasts! 40W Lamp Inverter Compact fluorescent lamp Producing Wound Components Transformer Design ePanorama Transformers Fluorescent Lamp

 Posted by admin at 7:14 AM  Tagged with:
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