RadioKot Forum - Topic Overview - Power Supply from an Energy-Saving Lamp

Power Supply from an Econo-Lamp

Sometimes there are various discussions, but too superficial. Who made it, please share the solution

Here is a typical circuit of an energy-saving bulb, I don’t remember where I got it from:

What I do: I put as much secondary winding on the choke L3 as the free space allows, which goes to the diode bridge of fast diodes and the load. All 4 leads of the lamp are shorted.

All well – the circuit is not heated, the load current goes to the load. But the voltage is not enough, the current is small. Or I should rewind both windings with thinner wire (no free space) to fit more secondary, or?

I go the right way: I eliminate the gap in the choke (now the transformer): great – the voltage immediately increased significantly and the current draws very well. Satisfied. But here is the problem: the transistors start to overheat, no way without a heatsink. Even at such a small current, at which the gap choke was all cold. And why do the transistors start to overheat if I eliminate the gap?

I don’t have a goal to remove the maximum power, but at least half of it. I am trying to get 250mA at 14v from a 5w lamp.

_________________ I solder with a copper stinger.

I can get the transformer from the phone charger instead of the choke, and it makes the transistors cold, but I get pretty good current at the output. But the voltage is a little bit missing.

I understand that I need to make the right transformer and all.

Question – with or without clearance?

_________________ I solder with a copper stinger.

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That goes without saying.

The question is about the schematic in the first post.

_________________ I solder with a copper stinger.

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Upgrader, in this circuit the number and the ratio of turns of current transformer, the capacitor capacity parallel to the tube (see your circuit above) and also the inductance of the choke, generally quite complicated thing, although by gauge you can get something, in general experiment, I doubt anyone will give you good advice.

Upgrader, in this circuit the number and the ratio of turns of current transformer, the capacitance of the capacitor parallel to the tube (see your scheme above)

and also the inductance of the choke, in general it is quite a complicated thing, although you can get something by gut feeling, in general experiment, I doubt anyone will give you good advice.

From the throttle I see how much everything depends, it’s hard to choose something.

Camelion LH5-2U 5W lamp (transistors 13001, but replaced by more powerful for the time of “dopilivaniya”) As I said before, with gap in the choke – current and voltage are not very big. Without the gap – big, but the circuit overheats. I made it work well by adjusting the gap scientifically – now it works exactly as I wanted it to, there is almost no heating of transistors. The gap is eliminated by assembling two reactors of one choke (the gap is in one half of the core).

Not all the chokes have room to wind the second winding. I have a choice – I took the one that had room. And if not – I’ll probably need to rewind with thinner wire carefully coil to coil. And as I understand it, the more turns of the primary, the better.

The final circuit, which is off to a long and happy life:

If something needs to be done differently, please tell me, don’t keep quiet.

If someone will also try to do something – be sure to include the circuit through a light bulb of small power (20-60 W), it immediately shows the abnormal consumption, I often have during the experiments with the transformer.

_________________ I solder with a copper stinger.

The similar circuits are used in portable lamps, where LDS and incandescent lamp are used, there is a secondary winding wound on the choke, which closes the LDS with a P2-to type switch and connects the incandescent lamp of 10 W to the secondary winding.

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If I understand correctly, C7 takes over the DC component, and the voltage on the choke becomes variable with no magnetization (and some lamps have slightly different circuitry, and the choke is explicitly connected to the midpoint of the capacitive voltage divider). So, is the gap in the savings tube used to increase the maximum current of the choke, at the cost of reduced inductance?

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The point is that in standard mode, C7 and L3 provide a frequency of 40-50kHz and limit the current through the tube.If you make a transducer and load from L3 and the principle is violated,I do not understand why it works even though it works defacto and even more loaded and who knows what the frequency and voltage there. here is a very good article in 2 parts…look there is a link to the first–http://www.radiolocman.com/shem/schematics.html?di=56463 when the coils are heated, the current through the circuit with C5 is very large. if the lamp is bad and the tubes are intact–transistors burn. imho C5 must be cut out or enlarged

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Maybe a little off-topic and late, but is it possible from the energy-saving lamp to make a diode? I do not know this well, although the lamp energy-saving disassembled, and I think whether it is worth a tester poke into it or live a little longer.

It is better, of course, to live a little longer Make it possible, I did (even a photo once posted), but here if

_________________ People never appreciate what they get easily.

May I ask what diameter wire you used? How many turns did you get, and how much current is the consumer device designed for?

I have a circuit completely similar to yours, but with a slight difference:

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serg_ns

The ones that would suit whoever conceived it.

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Power Supply from Power-Saving Bulbs

Well-known to most users, energy-saving bulbs, despite their popularity, fall into disrepair rather quickly and usually cannot be permanently repaired. However, if they burn out just one lamp, and the ECG circuit that feeds it remains in relative integrity, it can be used as an independent power supply (see photo).

Artificial “prolongation of life” of energy-saving products, which burned out only one luminaire, provides a cheap and relatively powerful UPS, the output voltage of which can be chosen arbitrarily.

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Design and principle of operation

Produced by the domestic industry energy-saving lamps, as well as widespread Chinese analogues have a similar electronic circuit (ECG), working on the principle of pulse conversion. This design gives the energy saving lamp the following clear advantages:

The electronic circuitry included in the energy-saving lamps guarantees a high load capacity of the product, working in the mode of long (continuous) glow;
The mains voltage efficiency is substantially increased;
The integrated circuitry of the energy-saving lamp makes it possible to obtain a compact and lightweight product (due to the absence of a bulky and heavy transformer).

Additional information. The considered energy-saving switching power supply circuit has only one small disadvantage, which is its low reliability and frequent failure.

The essence of the device ECG (so-called ballast) is simple enough and consists in the following:

First, the voltage of 220 volts is converted in a rectifier module into a constant potential of about the same magnitude;
Then a sequence of high-voltage pulses with a frequency of 20 to 40 kHz is generated in the electronic circuit under the influence of the rectified voltage (the exact value depends on the specific product model);
In the final stage of conversion, the electrical pulses are rectified (smoothed) by the output choke, and the resulting high voltage is then fed directly to the light bulb.

For a better understanding of how energy-saving lamps work, we have to take a closer look at the electronic circuitry which is used in them.

The ECG circuitry

The principle approach to reusing an energy-saving product is to use the electronic board, which has not yet burned out, as a switching power supply.

Please note! If a lamp that is plugged into the lighting network is still on, but starts flashing frequently and turning off on its own, it is a sure sign that it is likely to be classified as a burnout lamp.

To understand how energy-saving lamps work, you will need to understand their electronic circuitry (see figure below).

The working circuit of the electronic ballast includes the following obligatory elements:

Rectifier unit on diodes VD1-VD4, to which the mains voltage is fed through an additional limiting resistor R0;
High voltage filtering capacitor (C0) and smoothing filter (L0);
A special transistor converter, providing the formation of the working pulses of the esl (this circuit contains a number of electronic parts, facilitating the auto-start of the 20 kHz oscillation).

Diodes VD7 and VD6 perform a protective function, and transformers TV1-1 and TV1-2 form a feedback circuit, which increases the stability of the generation process. In the figure, where the lamp (or rather its scheme) is shown in red, the set of parts that must be removed when modifying the electronic unit is highlighted.

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Important! The control points A-A’ indicated in the figure must be connected by a metal jumper.

Peculiarities of the electronic module modification

Selection by power

Before you make a power supply unit from an energy-saving lamp, first of all, you will need to determine the power that will be needed from it in each case. On this parameter will depend on the degree of modernization of the electronic part, providing the possibility of normal operation of the equipment connected to it.

So, with a small operating power of the future power supply unit, ECG modification will affect only a small part of the whole circuit (see figure).

If you intend to make a pulsed power supply from an energy-saving lamp, designed for heavy loads (to connect a pulsed soldering iron, for example), its load characteristic must be increased. This will require a substantial revision of the ECG circuitry for an output power of more than 50 watts.

To calculate this parameter, remember that it is defined as the product of output current by the operating voltage. That is, if a 50-watt pulse soldering iron is rated at 25 volts, then the homemade power supply must provide an output current of at least 2 Amps (an upgraded diagram below).

In addition to the soldering iron, any medium-power low-voltage lamp can work from such a switched-mode power supply.

What parts are needed

In the revised schematic #1, the new parts are highlighted in red and indicate the following elements:

The diode bridge VD14-VD17;
Two capacitors (simple and electrolytic) C9 and C10;
An additional winding winded on the ballast choke L5, the number of turns of which is chosen experimentally.

Important! It serves as a separating element, excluding the possibility of 220 V mains voltage to the output of the power module.

Let’s look at what you can do to protect the output of the PSU from overloads by choosing the right number of turns of the output coil.

Selecting the Output Coil

To calculate the number of turns of the removable coil L5 you need to experiment a bit, which means to do the following:

First, about 10 turns of any insulated wire should be wound on top of the existing coil;
Then it is necessary to load the wound part on the rheostat with resistance of 5-6 ohms and power of about 30 watts (the method of soldering can be used to connect it);
The result is the construction shown in the figure below;

After this circuit is plugged in and then the voltage at the rheostat is measured with a tester;
The resulting value in volts is divided by the number of turns wound earlier, resulting in a figure corresponding to the specific voltage per turn.

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At the end of the experiment, determine the required number of turns required to obtain the specified output voltage by dividing its value by the result obtained earlier.

Winding design

When modifying the output coil, it should always be remembered that the primary winding is under high voltage. Therefore, all its design changes should be carried out only with the converter disconnected from the mains.

Winding according to version 1

When winding additional turns on the already available in the EBF choke, do not forget about the interwinding insulation, which is mandatory for PEL wires (in thin enamel insulation).

As such insulation, wound in several layers, you should use a special tape of polytetrafluoroethylene, often used to seal threaded joints.

Additional information. Such insulating tape has a thickness of only 0.2 mm and is most often used during repair and plumbing work.

The finished winding is loaded on a diode bridge, the rectified voltage from which goes to the load (it can be a normal low-voltage bulb, for example). Output power in the power supply made according to this scheme is usually limited by the size of the transformer used and the allowable currents of the switching device on transistors TV1 and TV2.

The winding according to version 2

To get a power supply of higher power to which you can connect a pulse soldering iron, for example, you will need a more complex rework (see the diagram below).

The red part of the circuit to be reworked includes the following elements:

An additional TV2 transformer with three windings (it is most convenient to use a ferrite ring with appropriate magnetic conductivity to make it);
Two semiconductor rectifier diodes VD14 and VD15;
Smoothing capacitors C9 and C10 of sufficient capacity.

Besides it is necessary to replace switching transistors TV1 and TV2 with more powerful models and put them on cooling radiators at the same time.

Note! For better smoothing of pulsations the capacity of most capacitors (including output C9 and C10) will have to be slightly increased.

As a result of this modernization, a partially burned-out energy-efficient lamp turns into a quite powerful power supply unit (up to 100 watts). In this case, its output voltage can take values from 12 volts and above with operating current in the load up to 8-9 amps. These parameters converted from a burnt-out lamp device may be quite enough to power a simple screwdriver, for example.

In conclusion, we note that in order to use a burned-out energy-saving lamp for self-made switching power supply unit (UPS), you need certain skills of handling an electric soldering iron. In addition, you will need the ability to understand electronic circuits at least at the level of understanding of the material presented in this review.