Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1994-01-06
1995-12-26
Nguyen, Matthew V.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
320 32, 320 39, H02M 3335, H02J 704
Patent
active
054793300
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electronic switch network part for supplying current to an accumulator from an alternating or direct current source with a primary beat blocking converter which contains a transmitter whose secondary winding is connected in series with the accumulator and a first diode and whose primary winding is connected in series with the collector-emitter path of a first transistor whose base is both attached to one end of the secondary winding of the transmitter by a regenerative resistance and a regenerative capacitor wherein the other end of the winding is connected to the accumulator, and also is connected by a first resistance to one pole of the input voltage source and to the collector of a second transistor whose emitter is placed on the mass potential wherein the emitter of the first transistor is both connected with the mass potential by a second resistance and accumulator and also attached to the base of the second transistor by a zener diode wherein a rocker stage is provided which blocks the first transistor on reaching a predetermined upper switch-off voltage at the accumulator and releases same when understepping a predetermined lower switch-on voltage.
BACKGROUND OF THE INVENTION
A circuit arrangement of this kind is known from EP 0 162 341. Switching off when reaching a certain accumulator voltage is carried out there by means of a rocker stage formed from the second and third transistors. As soon as the set ideal voltage is reached the first transistor which is designed as a switch transistor is blocked and is released again immediately the ideal voltage is understepped. With this known circuit arrangement after the start of charging the charging current decreases comparatively rapidly with an empty accumulator (cf FIG. 3).
From EP 0 383 383 A1 there is known an electronic switch. network part for supplying current to an accumulator with parallel-connectable direct current motor from an alternating or direct current source with a primary beat blocking converter which contains a transmitter whose primary winding is connected in series with a first transistor and a first resistance. The secondary winding of the transmitter lies in series with a diode and the accumulator and is connected to the base of the first transistor by the series connection of a second resistance and a capacitor. A circuit is provided to change from rapid charging to constant charging on reaching a predetermined accumulator voltage and to feed the direct current motor with constant voltage independent of the charge. This circuit contains a voltage divider connected to the emitter of the first transistor and having two series connected resistances and a second transistor whose base is attached to the connection of the second resistance with the capacitor.
SUMMARY OF THE INVENTION
The object of the invention is now to design a circuit arrangement of the kind mentioned at the beginning so that a rapid charging of the accumulator can take place in a much shorter time (for example about 30 minutes instead of about 60 minutes charging time from empty accumulator to practically full accumulator) without increasing to an inadmissible level the constant charging current which flows after complete charging.
BRIEF DESCRIPTION OF THE DRAWING
The invention will now be explained in further detail with reference to the embodiments shown in the drawings in which:
FIG. 1 shows an embodiment of the invention;
FIG. 2 shows the typical path of the cell voltage when charging an accumulator in dependence on the charged capacity;
FIG. 3 shows the path of the switch-off characteristic line of an embodiment of the circuit arrangement known from EP 0 162 341 B1; and
FIG. 4 shows the path of the switch-off characteristic line of an arrangement according to FIG. 1.
The switch-off characteristic line is hereby a function of the charging current in dependence on the charging time of an empty accumulator.
DESCRIPTION OF PARTICULAR EMBODIMENT
FIG. 1 illustrates an electronic switch network part which consists of a primary
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patent: 5239459 (1993-08-01), Remson
patent: 5390100 (1995-02-01), Palata
Braun Aktiengesellschaft
Nguyen Matthew V.
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