Isolating minimal switched power supply

Abstract

Conventional linear or switched power supplies do not sufficiently meet increased requirements for the lowest possible standby losses in idle current mode or ready mode, or for maintaining the charge in storage capacitors or rechargeable batteries even when said supplies have significantly increased circuit complexity. The proposed schematic diagram provides a solution which, in comparison to prior art, can produce a large-scale reduction in said standby losses using a breakover voltage diode, such as e.g. DIAC, SIDAC, TRISIL, or a glow lamp, which, once the respective breakover voltage or triggering voltage has been reached, repeatedly discharges a high-voltage charging capacitor via the primary winding of a pulse transformer, said capacitor in limiting the alternating current with zero-loss and being continuously re-charged by means of a high-voltage input charging capacitor in the surge and ebb supply voltage phases. The pulse bursts of the pulse transformer are rectified on the secondary side and smoothed by means of a buffer capacitor. As the output voltage is clearly dependent on a variable load impedance, a linear fixed voltage regulator with minimal power losses can be connected downstream to stabilise the voltage, without appreciably affecting the energy balance. Sensors that have been decentrally installed can thus be supplied, or a minimal voltage supply for load monitoring and prompt readiness can thus be provided, even for larger switched power supplies and load parts.

Dependencies are inferred from the claim text.