Depending on the ATX power supply being used, they may be unstable without the load. The project also leaves a lot of room for adding your own hacks such as variable voltage and current limiting
To accomplish this most all power supplies have separate voltage and current feedback control loops to limit either the output voltage or current, depending on the load. To illustrate this Figure 1 shows a circuit diagram of a basic 5 volt, 1 amp output series regulated power supply operating in CV mode. Goal is to find suitable values for the resistors and the right BJTs. 1) Q1: Assuming the power supply is working at its limit, on Q1 we will have a Ic=1.5A and Vce=Vcc-Vq2be=30-.7=29.3V. A suitable BJT able to support this values could be the D44H8. 2) Value of R1: The D44H8 has a worst case current gain of 10. Current Adjustment Modification: The stock supply has its maximum current limit set via R3 and R3X. Astron selects both when they manufacture the power supply, and the values depend on the current they feel the supply is capable of safely providing, usually a few amps greater than the maximum according to the model number.
Digital Current Limiting Techniques for Switching Power Supplies . Abstract. This paper explores the performance benefits gained by digital techniques for current limiting in switch-mode power supplies. The necessary control architecture is described along with the several possible modes of operation.
Four-channel power supply, 0V to 32V, max. 10A per channel, max. 384W total, resolution 1mV, 1mA to 0.2 mA, sense, tracking, EasyArb, electronic fuse, FuseLink. 4 channels and 384 W total output power. Maximum output voltage of 32 V per channel; higher voltages possible in serial operation. High output currents up to 5 A/10 A (depending on the

An inrush current limiter is a component used to limit inrush current to avoid gradual damage to components and avoid blowing fuses or tripping circuit breakers.Negative temperature coefficient (NTC) thermistors and fixed resistors are often used to limit inrush current. NTC thermistors can be used as inrush-current limiting devices in power supply circuits when added in series with the

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    • power supply with current limit