Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Patent
1984-02-06
1986-03-11
Salce, Patrick
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
363 21, 363 97, G05F 110
Patent
active
045756724
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a chopped power supply converter presenting very low rejection at the source.
A very well known structure allows very low rejection to be obtained, but under essentially voltage boosting working conditions, which may present disadvantages in some particular applications.
A more complex structure is also known allowing the output voltage to be brought down to the level of the input voltage, but with a polarity which is systematically reversed with respect to the input polarity, which may also present disadvantages.
The present invention has then as principle aim to remedy all these disadvantages and, for this, it provides a chopped power supply converter essentially characterized in that it comprises, between the two terminals of a DC power supply source, on the one hand a primary inductance in series with a chopping means and, on the other hand, a capacitive divider bridge formed of two capacitors, a secondary inductance coupled to the primary inductance and whose value with respect to this latter depends on the ratio of the capacitive divider bridge, this secondary inductance being connected between the output terminal of the divider bridge and the load by means of a series diode and a parallel capacitor, and a balancing device for permanently rebalancing said divider bridge.
As will be seen more clearly further on, such a structure allows the ratio of the voltage transfer to be readily adjusted by modifiying the ratio of the divider bridge, while keeping the characteristic of a substantially DC input current. Generally, it is desirable to obtain an output voltage equal to or less than the input voltage and, in this case, the ratio of the divider bridge is simply equal to or less than a half. In addition, the polarity of the output voltage is identical to that of the input voltage, the zero volt being common.
In a particular embodiment of the invention, the balancing device comprises two diodes arranged oppositely poled in parallel across the output circuit, and an energy storing inductance connected between the junction point between the two diodes and output terminal of the capacitive divider bridge.
In a variant of the invention, applicable more especially to supplying a circuit with non linear operation under starting conditions, the series diode and the balancing diode connected between the output of the secondary inductance and the energy storage inductance are replaced by thyristors, whereas the input of the secondary inductance is connected to both ends of the capacitive divider bridge respectively by a diode and another thyristor, the selective switching of these different thyristors providing passage successively from voltage dropping operation to operation as a dynamic non voltage-booster bridge, then to voltage booster operation.
Several embodiments of the invention are described hereafter, by way of examples, with reference to the accompanying drawings in which:
FIG. 1 is a partial block diagram of a chopped power supply converter in accordance with the invention;
FIG. 2 is a diagram illustrating the operation of this converter in its first phase;
FIG. 3 is a diagram illustrating the operation of this converter in its second phase;
FIG. 4 is a partial block diagram of a variant of the invention capable of operating under different conditions; and
FIG. 5 is a diagram illustrating the different operating conditions of this embodiment.
The converter shown in FIG. 1 comprises first of all, between the two terminals OV and + of a DC power supply source, a primary inductance L.sub.p connected in series with a chopping means here formed by a transistor Tr receiving at its base control pulses from a chopping regulator K. Between the two terminals of the power supply source is also connected to a capacitive divider bridge formed by two capacitors C.sub.1 and C.sub.2. A secondary inductance L.sub.s is moreover coupled to the primary inductance L.sub.p. This secondary inductance is connected between the middle point B of the capacitive divider bridge and load P through a
Deprez Louis E.
Klein Denys C.
Ault Anita M.
Compagnie de Signaux et d'Entreprises Electriques
Salce Patrick
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