High Voltage DC-DC Converter
Pulsed DC-DC converters are designed to both increase and decrease voltage. With their help, you can convert 5 volts with minimal losses, for example, to 12, or 24, or vice versa. There are also high-voltage DC-DC converters, they are capable of a relatively small voltage (5-12 volts) to get a very significant potential difference of hundreds of volts. In this article we will consider the assembly of just such a converter, the voltage at the output of which can be adjusted within 60-250 volts.It is based on the common integrated timer NE555. Q1 on the circuit is a field-effect transistor, you can use IRF630, IRF730, IRF740 or any other designed for operation with voltage above 300 volts. Q2 - low-power bipolar transistor, you can safely put BC547, BC337, KT315, 2SC828. The L1 choke should have an inductance of 100 µH, however, if there is no such hand, you can put chokes in the range of 50-150 µH, it will not affect the operation of the circuit.It is easy to make a throttle yourself - wind 50-100 turns of a copper wire on a ferrite ring. Diode D1 according to the scheme FR105, instead you can put UF4007 or any other high-speed diode for a voltage of at least 300 volts. Condenser C4 must necessarily be high-voltage, at least 250 volts, you can more. The greater its capacity, the better. It is also desirable to place in parallel a film capacitor of a small capacitance for high-quality filtering of high-frequency noise at the converter output. VR1 - tuning resistor, through which the output voltage is regulated. The minimum supply voltage of the circuit is 5 volts, the most optimal is 9-12 volts.After etching, the board must be tipped and checked for a short circuit. Since There is a high voltage on the board, there should not be any metal burrs between the tracks, otherwise breakdown is possible. First of all, small parts - resistors, diode, capacitors - are soldered onto the board. Then the microcircuit (it is better to install it in the socket), transistors, trimmer, choke. For the convenience of connecting to the board of wires, I recommend to put screw terminals, the places for them on the board are provided.Download fee:
Making a ConverterThe scheme is assembled on a printed circuit board with dimensions of 65x25 mm, the file with the board image is attached to the article. You can take a textolite larger than the drawing itself, so that there is room for fixing the board in the case around the edges. Several photos of the manufacturing process:
First start up and setupBefore start up, it is necessary to check the correctness of the installation, to ring the tracks. Trimmer resistor set to the minimum position (the engine should be on the side of the resistor R4). After that, you can apply voltage to the board by switching on an ammeter in series with it.At idle, the current consumption of the circuit should not exceed 50 mA. If it keeps within the norm, you can gently rotate the trimmer, controlling the voltage at the output. If everything is normal, connect a load to the high-voltage output, for example, a 10-20 kΩ resistor and once again test the operation of the circuit, already under load. The maximum current that can produce such a converter is approximately 10-15 mA. It can be used, for example, as part of lamp technology to power the anodes of the lamps, or it can light up gas discharge or luminescent indicators. The main application is a miniature stun gun, because the voltage of 250 volts at the output is noticeable for humans. Happy assembly!
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