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    51.
    发明专利
    未知

    公开(公告)号：DE602005016352D1

    公开(公告)日：2009-10-15

    申请号：DE602005016352

    申请日：2005-10-11

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ADRAGNA CLAUDIO ,  FAGNANI MAURO ,  GATTAVARI GIUSEPPE

    IPC: H02M1/42

    Abstract: The present invention describes is a device for power factor correction in forced switching power supply unit, comprising a converter (20) and a control device (100) coupled with the converter (20) so as to obtain from an input alternating mains voltage (Vin) a direct regulated voltage (Vout) on the output terminal. The converter (20) comprises a power transistor (M) and the control device (100) comprises an error amplifier (3) having in input on the inverting terminal a first signal (Vr) proportional to the regulated voltage (Vout) and on the non-inverting terminal a reference voltage (Vref), a drive circuit (4-7, 10) of the power transistor (M) coupled with the output terminal of the error amplifier (3). The control device (100) comprises means (42, Cff, 101, Rt, 102) suitable for generating a current signal (It) representative of the effective input voltage; said current signal (It) is in input on the inverting terminal of said error amplifier (3) to vary said regulated voltage (Vout) in reply to variations of the effective input voltage.

    53.
    发明专利
    未知

    公开(公告)号：DE60303354T2

    公开(公告)日：2006-09-28

    申请号：DE60303354

    申请日：2003-04-14

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ADRAGNA CLAUDIO ,  FAGNANI MAURO

    IPC: H02M1/00 ,  H02M1/36 ,  H02M3/335

    Abstract: The present invention refers to the switching power supply and particularly to the integrated circuits used for the control of such power supplies. It refers more particularly to a control circuit of the minimum working voltage of the integrated control circuits of such power supplies. In one embodiment the control circuit of the minimum working voltage of the integrated control circuit of a switching power supply having a supply voltage (Vcc); characterized in that said minimum working voltage can assume a first voltage value (Vstop1) and a second voltage value (Vstop2); said first voltage value (Vstop1) is higher than said second voltage value (Vstop2); said minimum working voltage switches from said first voltage value (Vstop1) to said second voltage value (Vstop2) in case of low or null load of said switching power supply; said minimum working voltage switches from said second voltage value (Vstop2) to said first voltage value (Vstop1) if the load is higher than a prefixed load of said switching power supply and at the same time said supply voltage (Vcc) is higher than said first voltage value (Vstop1).

    54.
    发明专利
    未知

    公开(公告)号：DE60014357T2

    公开(公告)日：2005-11-03

    申请号：DE60014357

    申请日：2000-07-18

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ADRAGNA CLAUDIO ,  SPINI CLAUDIO

    IPC: H02M1/00 ,  H02M1/36 ,  H02M3/335

    Abstract: The present invention relates to a start up circuit for commutation power supplies (PWM) or DC/DC converters and to a commutation type power supply comprising such a start up circuit. In an embodiment the start up circuit for commutation power supplies having an input terminal (In) and an output terminal (OUT) comprises: a first current generator (41) able to supply a first prefixed current (I) connected between said input terminal (In) and a first node (45); said first node (45) is coupled to said output terminal (OUT); characterized by further comprising a second current generator (42) able to supply a second prefixed current (K*I) connected between said input terminal (In) and a first terminal of a first controlled switch (44); the value of said second prefixed current (K*I) is greater than or equal to the value of said first prefixed current (I); a second terminal of said first controlled switch (44) is connected to said first node (45); a control circuit (43, V3) of said first controlled switch (44) able to maintain closed said first controlled switch (44) in the case in which the voltage on said output terminal (OUT) is lower than a first prefixed voltage (V3).

    56.
    发明专利
    未知

    公开(公告)号：DE60014357D1

    公开(公告)日：2004-11-04

    申请号：DE60014357

    申请日：2000-07-18

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ADRAGNA CLAUDIO ,  SPINI CLAUDIO

    IPC: H02M1/00 ,  H02M1/36 ,  H02M3/335

    Abstract: The present invention relates to a start up circuit for commutation power supplies (PWM) or DC/DC converters and to a commutation type power supply comprising such a start up circuit. In an embodiment the start up circuit for commutation power supplies having an input terminal (In) and an output terminal (OUT) comprises: a first current generator (41) able to supply a first prefixed current (I) connected between said input terminal (In) and a first node (45); said first node (45) is coupled to said output terminal (OUT); characterized by further comprising a second current generator (42) able to supply a second prefixed current (K*I) connected between said input terminal (In) and a first terminal of a first controlled switch (44); the value of said second prefixed current (K*I) is greater than or equal to the value of said first prefixed current (I); a second terminal of said first controlled switch (44) is connected to said first node (45); a control circuit (43, V3) of said first controlled switch (44) able to maintain closed said first controlled switch (44) in the case in which the voltage on said output terminal (OUT) is lower than a first prefixed voltage (V3).

    57.
    发明专利
    未知

    公开(公告)号：DE60003809T2

    公开(公告)日：2004-06-03

    申请号：DE60003809

    申请日：2000-07-28

    Applicant: ST MICROELECTRONICS SRL

    Inventor： GATTAVARI GIUSEPPE ,  ADRAGNA CLAUDIO

    IPC: H02M1/00 ,  H02M1/42

    Abstract: A converter directly connectable to the mains comprises a rectifier stage of the network voltage, a power factor correction pre-regulating circuit supplied with the rectified network voltage and producing a DC voltage of a certain nominal value, a DC-DC converter supplied with the DC voltage of a certain nominal value and producing a pre-established DC voltage on an output node, sensing means producing a signal representative of the current level of load being supplied by the converter. The power consumption of the converter is lowered by a control circuit fed with the signal representative of the level of load that generates a disabling signal of the power factor corrector pre-regulating circuit as long as the level of load does not exceed a certain pre-established threshold.

    POWER FACTOR CORRECTION DEVICE FOR SWITCHING POWER SUPPLIES
    59.
    发明专利
    POWER FACTOR CORRECTION DEVICE FOR SWITCHING POWER SUPPLIES 未知

    公开(公告)号：AU2002347601A1

    公开(公告)日：2004-04-08

    申请号：AU2002347601

    申请日：2002-09-20

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ADRAGNA CLAUDIO ,  FAGNANI MAURO ,  PIDUTTI ALBINO

    IPC: H02M1/00 ,  H02M1/42

    Abstract: A power factor correction device for switching power supplies is described, which comprises a converter ( 20 ) and a control device ( 100; 200; 300 ) coupled with said converter ( 20 ) in such a way as to obtain from a input network alternated voltage (Vin) a direct regulated voltage (Vout) at the output terminal. The converter ( 20 ) comprises a power transistor (M) and the control device ( 100; 200; 300 ) comprises an error amplifier ( 3 ) having in input at the inverting terminal a first signal (Vr) proportional to said regulated voltage (Vout) and at the non-inverting terminal a voltage reference (Vref), at least one capacitor (C) having a first terminal and a second terminal which are coupled respectively with the inverting terminal and the output terminal ( 31 ) of the error amplifier ( 3 ) and a driving circuit ( 4-6 ) of said power transistor (M) which is coupled with the second terminal of said capacitor (C). The control device ( 100; 200; 300 ) comprises interruption means (SW) placed between the output terminal ( 31 ) of said error amplifier ( 3 ) and the second terminal of said capacitor (C) and control means ( 103; 103, 301-303 ) able to activate said interruption means (SW) so as to control the interruption of the connection between the error amplifier ( 3 ) and said driving circuit ( 4-6 ) for at least one time period (T) lower than the time period (Tciclo) in which said control device ( 100; 200; 300 ) is operative.

    60.
    发明专利
    未知

    公开(公告)号：DE69724094D1

    公开(公告)日：2003-09-18

    申请号：DE69724094

    申请日：1997-04-09

    Applicant: ST MICROELECTRONICS SRL

    Inventor： ADRAGNA CLAUDIO ,  GATTAVARI GIUSEPPE ,  FAGNANI MAURO

    IPC: H02M3/28 ,  H02M3/335 ,  H04N3/185

    Abstract: The power output of a static DC_DC converter employing a current mode PWM controller is controlled upon the varying of the switching frequency, by detecting the sawtooth signal produced by the local oscillator generating a DC signal with amplitude inversely proportional to the frequency and by alternatively clamping the output voltage of the error amplifier of the PWM controller at a voltage proportional to the amplitude of said DC signal or by offsetting the signal present on the currents sensing resistor by a voltage corresponding to the difference between a constant voltage and said DC signal.

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