Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
259 words
A Cuk type direct/direct or DC/DC voltage converter, comprising; a primary side comprising; a first series circuit comprised of a first inductance coil, a first capacitor and a first winding, wherein said first series circuit receives at an input an input DC voltage; and an active switch-over element which enables said first series circuit to be short-circuited; a secondary side comprising; a second series circuit comprised of a second inductance coil, a second capacitor and a second winding, wherein said second series circuit delivers at an output an output DC voltage; and a passive switch-over device which enables said second series circuit to be short-circuited; a pulse generating circuit for producing control pulses, said control pulses having a variable width which is a function of an error signal, wherein said error signal is a function of a difference between a measured output DC voltage and a set output voltage; a control circuit which receives said control pulses and controls said active switch-over element, said control circuit comprising; a periodic slopes generator; and a comparator circuit for comparing the instantaneous level of the slopes given by the slope generator with a threshold level as a function of the error signal; wherein: a gradient of the slopes varies as a function of the input voltage and is independent of the output voltage; the threshold level is a function of the error signal; and the control pulses are produced between a fixed instant corresponding to the start of each slope and a variable instant corresponding to the flip-over of the comparator circuit.
Claim 2
Dependent Claim
259 words
A Cuk type direct/direct or DC/DC voltage converter, comprising; a primary side comprising; a first series circuit comprised of a first inductance coil, a first capacitor and a first winding, wherein said first series circuit receives at an input an input DC voltage; and an active switch-over element which enables said first series circuit to be short-circuited; a secondary side comprising; a second series circuit comprised of a second inductance coil, a second capacitor and a second winding, wherein said second series circuit delivers at an output an output DC voltage; and a passive switch-over device which enables said second series circuit to be short-circuited; a pulse generating circuit for producing control pulses, said control pulses having a variable width which is a function of an error signal, wherein said error signal is a function of a difference between a measured output DC voltage and a set output voltage; a control circuit which receives said control pulses and controls said active switch-over element, said control circuit comprising; a periodic slopes generator; and a comparator circuit for comparing the instantaneous level of the slopes given by the slope generator with a threshold level as a function of the error signal; wherein: a gradient of the slopes varies as a function of the input voltage and is independent of the output voltage; the threshold level is a function of the error signal; and the control pulses are produced between a fixed instant corresponding to the start of each slope and a variable instant corresponding to the flip-over of the comparator circuit.
Claim 3
Dependent Claim
58 words
The converter of claim 1, wherein the variation in gradient of the slopes generator is controlled by a control voltage tapped at a mid point of a divider bridge, the divider bridge being series-mounted with a voltage reference forming a divider bridge/voltage reference set which has applied thereto a voltage equal to or proportionate to the input voltage.
Claim 4
Dependent Claim
46 words
The converter of claim 2, wherein the values of the elements of the divider bridge and of the voltage reference are chosen so that the output voltage produced by the converter under the control of the control circuit is made essentially independent of the input voltage.
Claim 5
Dependent Claim
41 words
The converter of claim 1, wherein a mains voltage is applied as the input DC voltage and the frequency of repetition of the control pulses of the control circuit are notably greater in frequency than the frequency of the mains supply.