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公开(公告)号：US11264903B2
公开(公告)日：2022-03-01
申请号：US15707257
申请日：2017-09-18
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Pei-Hsin Liu , James Michael Walden
Abstract: A power converter circuit includes a power stage that includes a transformer and a switch. The switch can be controlled in response to a PWM signal to provide a primary current through a primary winding of the transformer to induce a secondary current in a secondary winding of the transformer to generate an output voltage. The power stage includes a switching node between the switch and the primary winding having a switching voltage. The circuit also includes a switching controller configured to generate the PWM signal in response to a ramp signal. The ramp signal can have an amplitude of a slope that is proportional to a decay rate of a magnetizing current of the transformer and generated in response to feedback from the power stage. The switch can be activated in response to the switching voltage having an amplitude of approximately zero volts based on the amplitude of the ramp signal.
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公开(公告)号：US11005355B2
公开(公告)日：2021-05-11
申请号：US16662681
申请日：2019-10-24
Applicant: Texas Instruments Incorporated
Inventor： Pei-Hsin Liu , Richard Lee Valley
Abstract: An apparatus is disclosed for improving zero voltage switching (“ZVS”) of a converter circuit such as an active clamp flyback converter. The apparatus includes a first timing circuit acting as the TD(L-H) optimizer, which uses the zero-crossing of the auxiliary winding voltage directly to adaptively vary the dead time. A second timing circuit acting as the TD(H-L) optimizer adaptively varies the dead time with a simple piece-wide linear function as an approximation of the complex optimal equation. A third timing circuit acting as the TDM optimizer contains a charge-pump circuit that adaptively adjusts the ON time of the clamp switch based on the zero-voltage detection of switching node voltage and feed-forwards the input voltage signal to enhance tuning speed so that the correct amount of negative magnetizing current is generated to improve zero voltage switching.
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公开(公告)号：US10886846B2
公开(公告)日：2021-01-05
申请号：US15883896
申请日：2018-01-30
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Pei-Hsin Liu , Richard Lee Valley
Abstract: A power converter circuit includes a power stage comprising a transformer and a power switch. The power switch can be controlled in response to a PWM signal to provide a primary current through a primary winding of the transformer to induce a secondary current in a secondary winding of the transformer to generate an output voltage. The power stage includes a switching node having a switching voltage between the power switch and the primary winding. A switching controller includes a control transistor device to initiate an operational voltage associated with the control transistor device during a startup mode of the power converter circuit and to provide a control voltage based on an amplitude of the switching voltage during a normal operating mode. The switching controller generates the PWM signal in response to comparing the control voltage and a predetermined switching threshold voltage.
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公开(公告)号：US20190181762A1
公开(公告)日：2019-06-13
申请号：US16276075
申请日：2019-02-14
Applicant: Texas Instruments Incorporated
Inventor： Pei-Hsin Liu , Bing Lu
Abstract: These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.
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公开(公告)号：US10243469B1
公开(公告)日：2019-03-26
申请号：US15786378
申请日：2017-10-17
Applicant: Texas Instruments Incorporated
Inventor： Pei-Hsin Liu , Bing Lu
Abstract: These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.
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Patent Agency Ranking
公开(公告)号：US11955896B2
公开(公告)日：2024-04-09
申请号：US17686376
申请日：2022-03-03
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Pei-Hsin Liu , Richard Lee Valley , Bharath Balaji Kannan
CPC classification number: H02M3/33523 , G06F1/266 , G06F13/4282 , H02M1/08 , H05B45/37 , G06F2213/0042 , H02M1/0009 , H02M1/0032
Abstract: A system includes an isolated converter having a power transformer with a primary winding, a secondary winding, and an auxiliary winding. The system also includes: 1) a first switch coupled to the primary winding; 2) a switch controller coupled to the first switch; and 3) a bias power regulator circuit coupled to the auxiliary winding and the switch controller. The bias power regulator circuit includes a second switch. The bias power regulator circuit is configured to provide a bias supply output voltage to the switch controller based on a first set of modes that modulate a switching frequency of the second switch and based on a second mode in which the second switch stays off.
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公开(公告)号：US11271483B2
公开(公告)日：2022-03-08
申请号：US16596954
申请日：2019-10-09
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Pei-Hsin Liu , Richard Lee Valley , Bharath Balaji Kannan
Abstract: A system includes an isolated converter having a power transformer with a primary winding, a secondary winding, and an auxiliary winding. The system also includes: 1) a first switch coupled to the primary winding; 2) a switch controller coupled to the first switch; and 3) a bias power regulator circuit coupled to the auxiliary winding and the switch controller. The bias power regulator circuit includes a second switch. The bias power regulator circuit is configured to provide a bias supply output voltage to the switch controller based on a first set of modes that modulate a switching frequency of the second switch and based on a second mode in which the second switch stays off.
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公开(公告)号：US20210006236A1
公开(公告)日：2021-01-07
申请号：US16905469
申请日：2020-06-18
Applicant: TEXAS INSTRUMENTS INCORPORATED
Inventor： Pei-Hsin Liu , Richard Lee Valley , Bharath Balaji Kannan
Abstract: In some examples, a circuit includes an input circuit, an output circuit, an auxiliary circuit, and a balancing circuit. The input circuit comprises a primary capacitor coupled to primary windings of a transformer. The output circuit comprises a secondary capacitor coupled to secondary windings of the transformer, wherein the secondary windings are coupled to the primary windings. The auxiliary circuit comprises auxiliary windings coupled to the primary windings. The balancing circuit is coupled to the output circuit, the auxiliary circuit, and the input circuit. The balancing circuit is configured to balance a voltage across the primary capacitor with a voltage across the secondary capacitor.
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公开(公告)号：US10554133B2
公开(公告)日：2020-02-04
申请号：US16276075
申请日：2019-02-14
Applicant: Texas Instruments Incorporated
Inventor： Pei-Hsin Liu , Bing Lu
Abstract: These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.
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公开(公告)号：US20190115836A1
公开(公告)日：2019-04-18
申请号：US15786378
申请日：2017-10-17
Applicant: Texas Instruments Incorporated
Inventor： Pei-Hsin Liu , Bing Lu
Abstract: These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.
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