摘要:
Beschrieben wird ein Spannungskonverter zum Konvertieren einer Eingangsspannung in wenigstens zwei Ausgangsspannungen, umfassend
einen Eingangsresonanzkreis, in den eine Primärwicklung eines Transformators einbezogen ist und dem die Eingangsspannung in periodisch wiederkehrenden Zeitintervallen zuführbar ist, wenigstens zwei Ausgangskreise, in die je eine Sekundärwicklung oder ein Teil einer Sekundärwicklung des Transformators einbezogen ist und denen je eine der Ausgangsspannungen entnehmbar ist, wobei
-- eine von einem ersten der Ausgangskreise gelieferte erste der Ausgangsspannungen eine Hochspannung und die übrige(n) Ausgangsspannung(en) (eine) demgegenüber niedrige Spannung(en) bildet (bzw. bilden), -- wenigstens (einer) der die übrige(n) Ausgangsspannung(en) liefernde(n) übrige(n) Ausgangskreis(e) eine Gleichrichteranordnung zum Liefern einer Gleichspannung als Ausgangsspannung aufweist.
Um einen solchen Spannungskonverter mit mehreren Ausgängen derart auszubilden, daß ein verbesserter Gleichlauf der Ausgangsspannungen, d.h. eine verringerte "Crossregulation", als in herkömmlicher Weise erreichbar erzielt wird, wird erfindungsgemäß eine der folgenden Maßnahmen vorgeschlagen:
1.) (je) eine zusätzliche Kapazität parallel zur Sekundärwicklung des Transformators in dem (bzw. den) die Gleichrichteranordnung(en) aufweisenden übrigen Ausgangskreis(en), wobei die zusätzliche(n) Kapazität(en) derart bemessen ist (bzw. sind), daß ihr(e) auf die Primärseite des Transformators transformierter Wert (bzw. transformierten Werte in Summe) im wesentlichen mit dem auf die Primärseite transformierten Wert einer Parallelkapazität der Sekundärwicklung des Transformators aus dem ersten Ausgangskreis übereinstimmt, 2.) (je) einen Hilfskreis in dem (bzw. den) die Gleichrichteranordnung(en) aufweisenden übrigen Ausgangskreis(en), wobei
jeder Hilfskreis eine zusätzliche Sekundärwicklung des Transformators umfaßt, die mit einem zusätzlichen Kondensator und einer zusätzlichen Gleichrichteranordnung in einer Reihenschaltung angeordnet ist und diese Reihenschaltung parallel zu einem Zweig der Gleichrichteranordnung des betreffenden Ausgangskreises sowie einer mit diesem verbundenen Last angeordnet ist.
摘要:
A high magnitude potential supply comprising a first circuit for generating a first signal related to a desired output high magnitude potential across a pair of output terminals of the supply, a second circuit for generating a second signal related to an output current from the high magnitude potential supply, a third circuit for supplying an operating potential to the high magnitude potential supply so that it can produce the high magnitude operating potential, the third circuit having a control terminal, a fourth circuit coupled to the first and second circuits and to the control terminal, the fourth circuit receiving the first and second signals from the first and second circuits and controlling the operating potential supplied to the high magnitude potential supply by the third circuit, and a fifth circuit for disabling the supply of operating potential to the high magnitude potential supply so that no high magnitude operating potential can be supplied by it, the fifth circuit also coupled to the control terminal.
摘要:
An inductive load driver comprising a DC-DC converter which has a coil (L) and a switch (Sw) in series with a power source (E) and a capacitor (C) provided in parallel with the switch (Sw). The DC-DC converter produces a high voltage by a procedure in which the switch (Sw) is closed to apply the power source voltage to the coil (L) and then the switch (Sw) is opened to transfer the magnetic energy stored in the coil (L) to the capacitor (C). Using a permanent magnet (Mg) a bias in the direction opposite to that of the magnetic flux induced by the current is applied to the magnetic core of the coil (L) so as to increase the magnetic energy stored in the coil (L). Thus a DC-DC converter circuit in which a capacitor is efficiently charged through a small-sized coil is realized, and an inductive load driver having a small size and a light weight is also realized.
摘要:
A resonant converter arrangement comprising two resonant converters, each having a resonant circuit through which current is switched alternately in opposite directions by switch means, the outputs of the two resonant converters being mutually combined to provide an output of the arrangement the amplitude of which is controlled in dependence upon the relative phase of the outputs of the two resonant converters, by a switch controller to which the switch means is arranged to be responsive.
摘要:
A transformer having galvanically isolated windings defines a primary side and a secondary side of a power conversion apparatus. A switch couples power from a source on the primary side via the transformer to a load on the secondary side. A first circuit assembly has primary-side circuitry galvanically coupled to a port for connection to an input power source. The primary-side circuitry includes a primary-side communicator for sending or receiving control information used in controlling operation of the power conversion apparatus. A second circuit assembly has secondary-side circuitry galvanically coupled to a port for connection to a load. The secondary-side circuitry includes a secondary-side communicator for sending or receiving the control information. The first and second circuit assemblies are mechanically separable as assemblies from one another, are galvanically isolated from one another, and are configured to be placed in positions relative to one another to enable the primary-side and secondary-side communicators to cooperate to pass the control information.
摘要:
A transformer having galvanically isolated windings defines a primary side and a secondary side of a power conversion apparatus. A switch couples power from a source on the primary side via the transformer to a load on the secondary side. A first circuit assembly has primary-side circuitry galvanically coupled to a port for connection to an input power source. The primary-side circuitry includes a primary-side communicator for sending or receiving control information used in controlling operation of the power conversion apparatus. A second circuit assembly has secondary-side circuitry galvanically coupled to a port for connection to a load. The secondary-side circuitry includes a secondary-side communicator for sending or receiving the control information. The first and second circuit assemblies are mechanically separable as assemblies from one another, are galvanically isolated from one another, and are configured to be placed in positions relative to one another to enable the primary-side and secondary-side communicators to cooperate to pass the control information.
摘要:
In a converter or inverter comprising a switching circuit (23) for switching a d.c. input signal into a switched signal, a piezoelectric transformer (25) for driving a load (27) with a converter output signal, and an FM modulator (43-47) for detecting the converter output signal to produce a rectangular signal for adjusting a switched frequency of the switched signal, a duty ratio adjuster (49) is supplied with the d.c. input signal to control the rectangular signal for adjustment of a duty ratio of the switched signal. Preferably, a filter (29) filters the switched signal for the piezoelectric transformer. The converter is given a high efficiency by use of a rectifier on producing the converter output signal. In any event, the switching circuit may comprise first (31) and second (33) switching elements, which may be used as an active clamp circuit to linearize a feed forward characteristic of the duty ratio.
摘要:
A resonant converter arrangement comprising two resonant converters, each having a resonant circuit through which current is switched alternately in opposite directions by switch means, the outputs of the two resonant converters being mutually combined to provide an output of the arrangement the amplitude of which is controlled in dependence upon the relative phase of the outputs of the two resonant converters, by a switch controller to which the switch means is arranged to be responsive.