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【Experimental production of
full-transistor type】 A cheap and simple configuration is an IGN (ignition coil) sold at auctions, and it can be easily done by using it to generate high voltage. It has three terminals, and there are various types of three terminals. To operate it with the circuit diagram below, be sure to get an IGN with terminals like the one in the photo. Other shapes have not been tested, and they cannot be started with this circuit.  【3-wire IG coil】 When I looked into it previously, I found that the 3-wire IG coil has the following internal structure: 12V is supplied to the +B terminal, and a pulse is supplied to the IG terminal for the required period to excite the primary coil. It seems that this type is not installed in recent cars and may be difficult to obtain.  The oscillator device to drive the IG coil is the inverter 4069, which can be easily obtained and can be driven at 12V. The 74 series is driven at 5V, so the 40 series can be used up to 18V. Oscillate with an astable multi, and create the required pulse width from the pulse edge. The oscillation frequency is usually around a few Hz, but it can be changed up to about 50Hz with VR1. C3 differentiates the square wave to set the primary current period of the IG-Coil. The larger the time constant of C3 and R9, the longer the current period. Finally, the C point waveform drives the transistor in the IG-Coil. A single 12V power supply is OK for those used in 12V cars, but it seems that the drive current needs to be changed depending on the IG-Coil. The drive current is set by R6. Since it is cold in winter, the transistor HFe in the IG-Coil also drops, so it is better to drive it with a little margin. Q1 and Q2 use small signal transistors. In the end, I decided to use a constant that discharges at one-second intervals, and eliminated the semi-fixed VR. SW=ON for nighttime operation only, OFF for continuous operation. I would like to use about three earth rods for grounding, but one is also fine. Due to the issue of ground resistance, I would like to increase the discharge power as much as possible, but this type of IGN is driven by 12V, so the discharge power can be increased by changing the +B voltage supplied to the IGN from 12V to 24V. High voltage will not be output at 24V or more (such as 26V), so do not make it 24V or more. The 12V to 24V DCDC boost converter was a 3A product (1300 yen) on Amazon, but it is currently out of stock and only 5A products are available. This is the final circuit including all of these.   Final circuit diagram  I measured the waveforms at each point and the high voltage discharged from the plug. The first shot was over 15,000V, and the peak voltage was about 20,000V. Of course, this was under no load.    Parts list used in this build  Finally, store it in a plastic box and it's complete.  【CDI (Capacitor discharge ignition) experiment】 In the CDI system, the discharge power can be determined to a certain extent by selecting the capacitor capacitance and charge/discharge voltage values.
【Charging a 12V battery】 To make the battery maintenance-free, you can connect it to a solar panel. The solar panel I used is Akizuki's 5W solar cell module, which does not require a charging circuit and can be connected directly to the battery (the panel has a diode), but if you use a larger panel (A class), you will need a charging circuit.   |
