AUTONOMOUS RESONANCE INVENTORIES FOR DC-DC INVERTERS OF IMPROVED CHARACTERISTICS

摘要

The invention relates to resonance inverters for DC-DC inverters which have improved characteristics. This is due to the limitation of the voltage on the switching capacitor, which is achieved by dividing the load into two equal parts in the bridge circuitries, one side of the ends of which are connected to the middle parts of the two arms of the bridge, and the other two ends are interconnected by means of the switching capacitor (7), the voltage of which is limited to levels +Eo(-Eo). In charging the capacitor (7) to voltage +Eo(-Eo), the current which is received from the supply source (10) is discontinued, and the stored energy in the switching inductivities (8 and 9), which are coupled in the AC output circuit, is dissipated across the enabled diode, the respective half of the load and the operating switching instrument. The voltage limitation on the capacitor (7) enables the DC-DC inverters to have a favourable transition process of start-up and even to operate reliably in a short-circuit mode of the load. On the other hand, the connected in parallel of the inventor instruments groups of capacitor and diode, due to the special algorithm of control, wherein the duration of the controlling pulse exceeds the half-cycle of its own oscillations of the consecutive resonance circuit, ensure the operation of these instruments at zero switching, both of the current, and of the voltage. At an established mode, the limitation diodes are not put into operation and the circuitry operates as the known circuits of DC-DC inverters of zero switching of the current and the voltage. The circuitries limit the voltage of the switching capacitor in start-up or emergencies modes. The instruments of the inventor are included in three groups, consisting of diode and capacitor connected in parallel. 2 claims, 2 figures