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1.发明专利
公开(公告)号：JP2000125561A
公开(公告)日：2000-04-28
申请号：JP28636299
申请日：1999-10-07
Applicant: ST MICROELECTRONICS SRL
Inventor： LIONETTO ANTONIO , OCCHIPINTI LUIGI , SPAMPINATO SERGIO TOMMASO , CAPONETTO RICCARDO
Abstract: PROBLEM TO BE SOLVED: To prevent a burst mode function and, at the same time, to reduce overshooting by modulating the turning-off period of a power switch by using a combinatory function of operating parameters until a limit output voltage condition is reached when mode transition is made from a self-exciting oscillation mode to a fixed oscillator frequency mode. SOLUTION: A primary control loop controls the output voltage Vout of a flyback converter by controlling the voltage Vcs of the self-feeding power of a control circuit by means of an error amplifier Error Amp and a secondary control loop directly controls the output voltage Vout by optically coupling the amplifier Error Amp and control circuit to a Vcomp pin. Then the turning- off period of a power switch is continued until the energy stored in a transformer during the turning-on period of the power switch is completely transferred to an output circuit by operating a bistable circuit LATCH in accordance with the voltage Vcomp compensation capacitor Ccomp through a comparator Ccomp.
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公开(公告)号：IT1319755B1
公开(公告)日：2003-11-03
申请号：ITMI20002836
申请日：2000-12-28
Applicant: ST MICROELECTRONICS SRL
Inventor： SPAMPINATO SERGIO TOMMASO
IPC: H01L27/07
Abstract: An integrated device in emitter-switching configuration is described. The device is integrated in a chip of semiconductor material of a first conductivity type which has a first surface and a second surface opposite to each other. The device comprises a first transistor having a base region, an emitter region and a collector region, a second transistor having a not drivable terminal for collecting charges which is connected with the emitter terminal of the first transistor, a quenching element of the first transistor which discharges current therefrom when the second transistor is turned off. The quenching element comprises at least one Zener diode made in polysilicon which is coupled with the base terminal of the first transistor and with the other not drivable terminal of the second transistor. The at least one polysilicon Zener diode is formed on the second surface of said chip and it comprises a polysilicon layer having at least one zone of the first conductivity type and at least one zone of a second conductivity type in order to form at least one P-N junction.
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公开(公告)号：DE69814073D1
公开(公告)日：2003-06-05
申请号：DE69814073
申请日：1998-09-23
Applicant: ST MICROELECTRONICS SRL
Inventor： SPAMPINATO SERGIO TOMMASO , TAGLIAVIA DONATO , TORRES ANTONINO
Abstract: A flyback DC-DC converter, autooscillating in a quasi resonant manner (QRC) during steady state operation, employing a flyback transformer for storing and transferring energy to a load having an auxiliary winding (AUS) whose voltage is compared by a comparator (COMP1) with a threshold (VREF1) to detect its crossing and as a consequence switch on through a control flip-flop (FF) a power transistor (POWER) driving the primary winding of said transformer for a new phase of conduction and accumulation of energy, whose duration is established by a secondary control loop of the output voltage (ERROR AMP, CONTROL) producing the switching off of the power transistor for a successive energy transfer phase toward the load of the energy stored in the transformer during the preceding conduction phase, has a wholly integrated control circuit that comprises a second comparator (HVCOMP) of the voltage existing on the current terminal of said power transistor (POWER) connected to the primary winding of the transformer in respect to the ground potential of the circuit; a logic gate (OR) having a first input connected to the output of said second comparator (HVCOMP) and an output coupled to the set terminal of said control flip-flop (FF); a delay network (ON DELAY) coupled in cascade to the output of said first comparator (COMP1) and having an output coupled to a second input of said logic gate (OR), so that under steady state functioning conditions of the converter, the setting of the flip-flop (FF) is done by said second comparator (HVCOMP) rather than by said first comparator (COMP1).
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公开(公告)号：DE69820059D1
公开(公告)日：2004-01-08
申请号：DE69820059
申请日：1998-09-28
Applicant: ST MICROELECTRONICS SRL
Inventor： SPAMPINATO SERGIO TOMMASO , TAGLIAVIA DONATO
Abstract: A method of protection from the effects of a persistent short circuit of the output of a DC-DC flyback converter self-oscillating either at a variable frequency or functioning at a fixed frequency in a discontinuous manner, using a transformer for storing and transferring energy to a load, having an auxiliary winding (AUS) for synchronizing the turning on of the power switch (POWER) that drives the winding (N1) of the transformer under a condition of null current in the primary winding when self-oscillating at a variable frequency, wherein the voltage induced back from the current flowing in a secondary winding (N2) of the transformer on said auxiliary winding (AUS) is rectified and filtered (D2, C2) to power, during a steady state of operation, the control circuitry (CONTROL) of the converter, the turning on of the power switch (POWER) being driven during a start-up or recovery phase by a primary control loop, when the supply voltage (VDD) of the control circuit reaches or is over a preestablished enabling threshold of the control circuit, a secondary control loop comprising a photocoupler of the output error voltage (ERROR AMP) to an input (COMP) of the control circuitry (CONTROL) to which it is connected a compensation capacitor (CCOMP), includes the steps of discriminating an output short circuit condition from a start-up or recovery condition by comparing (COMP1) the voltage (VAUS) present on said auxiliary winding (AUS) with a preestablished threshold (Vref1) higher than the voltage (VAUS) that is induced on the auxiliary winding (AUS) under a short circuit condition of the secondary winding (N2) of the flyback transformer and by comparing the voltage existing on said compensation capacitor (CCOMP) with a second threshold (Vref2) of value equal or close to the value of maximum charge of said compensation capacitor (CCOMP), within a time interval sufficiently delayed from the turn-off instant of the power switch (POWER); conditioning, by means of a (SET CC) signal resulting from the logic combination (AND) of the signal originating from said two comparisons (OUTZC, OUTCOMP), in said interval of definite time (MONO1), the enabling upon turning on (FF2, FF1, DRIVER) of the Power switch (POWER).
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公开(公告)号：DE69810625D1
公开(公告)日：2003-02-13
申请号：DE69810625
申请日：1998-10-07
Applicant: ST MICROELECTRONICS SRL
Inventor： LIONETTO ANTONIO , OCCHIPINTI LUIGI , SPAMPINATO SERGIO TOMMASO , CAPONETTO RICCARDO
Abstract: A method of controlling a flyback DC-DC converter, self-oscillating at steady state conditions, employing a transformer for storing and transferring energy to a load and having an auxiliary winding whose voltage, induced by the current flowing in the secondary winding of the transformer, is monitored to regulate the amount of energy being transferred by way of a primary control loop disabling and enabling the turning on of a power switch driving the primary winding of the transformer and to detect its the zero-crossing and consequently turn on the power switch for a new conduction and energy storage phase, the duration (TON) of which is established by a secondary control loop of the output voltage producing the turning off of the power switch for a new off phase (TOFF), and comprising a fixed frequency oscillator of a frequency lower than the self-oscillating frequency of the converter for start-up charge transient of an output filter capacitor, wherein the power transferred from the primary circuit to the secondary circuit of the flyback transformer is controlled by introducing a delay on the turn-on instant of the power switch in respect to a turn-on command generated, during a self-oscillating functioning phase upon sensing a zero crossing event and during a fixed frequency functioning phase, upon a rising front of the signal generated by said oscillator, in function of input variables of the enabling-disabling primary control loop and of the secondary control loop, regardless of the mode of control.
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Patent Agency Ranking
公开(公告)号：DE60114981T2
公开(公告)日：2006-08-10
申请号：DE60114981
申请日：2001-02-01
Applicant: ST MICROELECTRONICS SRL
Inventor： SPAMPINATO SERGIO TOMMASO , TORRES ANTONINO
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公开(公告)号：DE60114981D1
公开(公告)日：2005-12-22
申请号：DE60114981
申请日：2001-02-01
Applicant: ST MICROELECTRONICS SRL
Inventor： SPAMPINATO SERGIO TOMMASO , TORRES ANTONINO
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公开(公告)号：DE69814073T2
公开(公告)日：2004-01-22
申请号：DE69814073
申请日：1998-09-23
Applicant: ST MICROELECTRONICS SRL
Inventor： SPAMPINATO SERGIO TOMMASO , TAGLIAVIA DONATO , TORRES ANTONINO
Abstract: A flyback DC-DC converter, autooscillating in a quasi resonant manner (QRC) during steady state operation, employing a flyback transformer for storing and transferring energy to a load having an auxiliary winding (AUS) whose voltage is compared by a comparator (COMP1) with a threshold (VREF1) to detect its crossing and as a consequence switch on through a control flip-flop (FF) a power transistor (POWER) driving the primary winding of said transformer for a new phase of conduction and accumulation of energy, whose duration is established by a secondary control loop of the output voltage (ERROR AMP, CONTROL) producing the switching off of the power transistor for a successive energy transfer phase toward the load of the energy stored in the transformer during the preceding conduction phase, has a wholly integrated control circuit that comprises a second comparator (HVCOMP) of the voltage existing on the current terminal of said power transistor (POWER) connected to the primary winding of the transformer in respect to the ground potential of the circuit; a logic gate (OR) having a first input connected to the output of said second comparator (HVCOMP) and an output coupled to the set terminal of said control flip-flop (FF); a delay network (ON DELAY) coupled in cascade to the output of said first comparator (COMP1) and having an output coupled to a second input of said logic gate (OR), so that under steady state functioning conditions of the converter, the setting of the flip-flop (FF) is done by said second comparator (HVCOMP) rather than by said first comparator (COMP1).
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公开(公告)号：DE69810625T2
公开(公告)日：2003-11-27
申请号：DE69810625
申请日：1998-10-07
Applicant: ST MICROELECTRONICS SRL
Inventor： LIONETTO ANTONIO , OCCHIPINTI LUIGI , SPAMPINATO SERGIO TOMMASO , CAPONETTO RICCARDO
Abstract: A method of controlling a flyback DC-DC converter, self-oscillating at steady state conditions, employing a transformer for storing and transferring energy to a load and having an auxiliary winding whose voltage, induced by the current flowing in the secondary winding of the transformer, is monitored to regulate the amount of energy being transferred by way of a primary control loop disabling and enabling the turning on of a power switch driving the primary winding of the transformer and to detect its the zero-crossing and consequently turn on the power switch for a new conduction and energy storage phase, the duration (TON) of which is established by a secondary control loop of the output voltage producing the turning off of the power switch for a new off phase (TOFF), and comprising a fixed frequency oscillator of a frequency lower than the self-oscillating frequency of the converter for start-up charge transient of an output filter capacitor, wherein the power transferred from the primary circuit to the secondary circuit of the flyback transformer is controlled by introducing a delay on the turn-on instant of the power switch in respect to a turn-on command generated, during a self-oscillating functioning phase upon sensing a zero crossing event and during a fixed frequency functioning phase, upon a rising front of the signal generated by said oscillator, in function of input variables of the enabling-disabling primary control loop and of the secondary control loop, regardless of the mode of control.
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公开(公告)号：ITMI20002836A1
公开(公告)日：2002-06-28
申请号：ITMI20002836
申请日：2000-12-28
Applicant: ST MICROELECTRONICS SRL
Inventor： SPAMPINATO SERGIO TOMMASO
IPC: H01L27/07
Abstract: An integrated device in emitter-switching configuration is described. The device is integrated in a chip of semiconductor material of a first conductivity type which has a first surface and a second surface opposite to each other. The device comprises a first transistor having a base region, an emitter region and a collector region, a second transistor having a not drivable terminal for collecting charges which is connected with the emitter terminal of the first transistor, a quenching element of the first transistor which discharges current therefrom when the second transistor is turned off. The quenching element comprises at least one Zener diode made in polysilicon which is coupled with the base terminal of the first transistor and with the other not drivable terminal of the second transistor. The at least one polysilicon Zener diode is formed on the second surface of said chip and it comprises a polysilicon layer having at least one zone of the first conductivity type and at least one zone of a second conductivity type in order to form at least one P-N junction.
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