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Patent

DC to DC converter with isolated output - suitable for aircraft control panel illumination and uses relaxation oscillator which triggers transformer input

Gaume Robert
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TLDR
In this paper, the secondary winding of the transformer is connected to an isolating transformer whose output is rectified filtered and fed to the output via a current measuring resistance (OMR).
Abstract: 
The secondary winding of the transformer(22) supplies an amplifier(25) connected to an isolating transformer(30) whose output is rectified filtered and fed to the output via a current measuring resistance(37) Another rectifier(40) provides a reference to a threshold circuit(45) whose other input is from the current measuring resistance Its output is connected to an OR gate A comparator(50) sensing the reference voltage and the output voltage, is also connected to the OR gate The gate output provides negative feedback to the relaxation oscillator via a photo-diode and transistor pair The circuit gives a totally isolated output suitable for use in aircraft control panel illumination circuits

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Citations
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Patent

Single ended, separately driven, resonant DC-DC converter

Toshihiro Onodera, +1 more
TL;DR: In this article, a single-ended, separately driven, resonant DC-DC converter including a transformer, a capacitor connected in parallel with a primary winding of the transformer, and a switching transistor connected between one end of the primary wound of a transformer and one end in a DC power source is described.
Patent

Intrinsically safe power supply with a current regulator

Wolfgang Dipl.-Ing. Röhl
TL;DR: In this paper, an intrinsically safe power supply arrangement with a current regulator is provided with a controlled semiconductor, coupled to a clock generator and coupled between a rectifier and a primary winding of a transformer, for periodically interrupting a DC current in response to clock signals.
Patent

Intrinsic safety power supply with a controlled semiconductor disposed in the primary circuit of a transformer

Wolfgang Dipl.-Ing. Röhl
TL;DR: In this article, a power supply device that works according to the principle of a clocked power supply unit is described, where a controllable semiconductor is arranged in the primary circuit of a transformer, which is driven periodically by a clock generator.
Patent

Security circuits for a switching regulator power supply

Jean-Paul Louvel
TL;DR: In this paper, a thyristor (40) is provided across the terminals of a winding (28) furnishing a higher voltage (+12V), being triggered when the output voltage exceeds a certain value (Zener 46).
Patent

Circuits de sécurité pour alimentation à découpage

Jean-Paul Louvel
TL;DR: In this paper, the sortie + 5V d'une alimentation a decoupage was used to defend contre les court-circuits and les surtensions.