Patent EA-004171-B1 (EA)
Title: Circuit arrangement and method for pulsated charging of batteries
IPC: H02J7/02
Filed: 2000-07-03
Abstract: 1. Circuit arrangement for pulsated charging of batteries, comprising: -an alternating current source having a predetermined inductance and a pair of output terminals; -a rectifier (Gr) with alternative current terminals connected to the free ends of the bridge branches and with direct current terminals connected to the battery (B) to be charged; wherein comprises a pair of bridge branches each comprising a parallel arrangement of a capacitor (C1, C2) and a semiconductor switch (D1, D2), said branches being connected to the source of the alternative current terminals and alternative current terminals of said rectifier (Gr) in such a way that said semiconductor elements in both branches being connected with similar electrodes to the associated one of the terminal. 2. The circuit arrangement as claimed in claim 1, wherein said rectifier (Gr) being a full wave rectifier. 3. The circuit arrangement as claimed in claim 1, wherein said alternating current source comprising a transformer (Tr) having a primary and secondary windings and said outlet terminals are the terminals of said second winding, and wherein said inductance being dominantly constituted by the secondary winding of the transformer. 4. The circuit arrangement as claimed in claim 1, further comprising LC elements (L1, C3) forming filter circuits. 5. The circuit arrangement as claimed in claim 1, comprising a controlled power controller (Th1, Th2, Th3, Th4) connected in series with the alternating source and allowing passage only of a partial range from each full period of the alternating current, and the size of this partial range when expressed in angle units being the flowing angle, and the power controller is adapted to change the flowing angle and thereby the charging power for the battery (B) within predetermined limits. 6. The circuit arrangement as claimed in claim 1, comprising at least one further capacitor (C3), and a switch (S) whereby said further capacitor (C3) can be connected in parallel with the capacitor (C2) in one of said bridge branches. 7. The circuit arrangement as claimed in claim 6, wherein the capacitance values of the capacitors (C1, C2) in said bridge branches differ from each other at most by 200%. 8. The circuit arrangement as claimed in claim 3, wherein said transformer (Tr) has a winding with a plurality of tap points of which at least one being selectable by a switch to adjust thereby the properties of said charging power. 9. The circuit arrangement as claimed in claim 1, comprising a plurality of pairs of bridge branches dimensioned substantially to identical voltage, and said pairs being connectable in parallel for the sake of adjustment of the charging power. 10. The circuit arrangement as claimed in claim 1, wherein said semiconductor switches being diodes. 11. The circuit arrangement as claimed in claim 1, wherein said alternating current source having an adjustable frequency. 12. A method for pulse charging batteries by using an circuit arrangement as claimed in claim 1. 13. The method as claimed in claim 12, wherein the differential quotient of the generated periodically repeated charging current takes a zero or near zero value twice in each of said periods, where after it changes its sign and has a substantial jump. 14. The method as claimed in claim 12, comprising the steps of examining the battery type prior to the actual charging and establishing those charging voltage and current limit values that still do not cause harm to the battery, and during the actual charging process keeping the actual current and voltage values within the so established limits.