Electronics Projects, High Voltage Laboratory Power Supply Circuit 50V to 450V 500mA article
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Laboratory Power Supply Voltage adjustable from 50 to 450 volts in a current of 500 milliamps, with a stable 0.1% 100Hz ripple and noise factor: <1 mV pp on the range. The internal resistance is <0.5 ohm static and <1 ohm dynamics of 10Hz to 100KHz.
The control circuit is simply a high voltage amplifier. Here we find two SIPMOS BUZ80 (Q2, Q3) connected in series ballast to distribute dissipation. These transistors are controlled by a third SIPMOS BUZ80 (Q1) mounted in a common gate. The ratio of the source resistor (R4) and 470Ω load resistors collector Q1 (R5, R6) of 200K, gives us a gain of 400. However, a portion of the output voltage equivalent to 1/20 (R14/R12 + R13 + P2) is fed against negative feedback circuit in the gate of Q1 and we reduced the total gain at 20. We will see later against the benefits of this reaction.
Warning:The conduct of this project requires experience and professionalism. Tensions are conveyed all dangerous, in the same way as those generated in tube amplifiers. Prudence donc ! Prudence therefore! The circuit is composed of 3 sub-groups: the circuit switches, pre-regulation and regulation: block diagram The circuitry for issuing voltages +24 Vdc, +5 Vdc and -5 Vdc and allows the delayed entry into service of the main transformer of 400 VA. The map of pre-regulation issue in a low impedance (Z = 5 ohm), a voltage stabilized at 485 Vdc. The card issuing the regulation voltage controlled variable from 50 to 450 volts in a current of 500 mA max.
450V Laboratory Power Supply
Source: novotone.be/ High Voltage Laboratory Power Supply schematic pcb files alternative link: high-voltage-laboratory-power-supply-circuit-50v-to-450v-500ma.rar alternative link2