公开(公告)号：US20160211747A1

公开(公告)日：2016-07-21

申请号：US15085428

申请日：2016-03-30

Applicant: University of Virginia Patent Foundation

Inventor： Benton Calhoun ,  Aatmesh Shrivastava

IPC: H02M3/156

CPC classification number: H02M3/158 ,  G05F1/462 ,  G05F1/565 ,  H02M1/088 ,  H02M3/156 ,  H02M2001/0025

Abstract: The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.

公开(公告)号：US09979348B2

公开(公告)日：2018-05-22

申请号：US15161521

申请日：2016-05-23

Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

Inventor： Benton H. Calhoun ,  Aatmesh Shrivastava

IPC: H03B5/36 ,  H03L5/00

CPC classification number: H03B5/364 ,  H03B5/04 ,  H03B5/32 ,  H03B2200/0012 ,  H03B2200/0046 ,  H03B2200/0064 ,  H03B2200/0082 ,  H03L5/00

Abstract: A low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power biases an amplifier for an XTAL in the sub-threshold operating regime. A feedback control scheme can be used to bias the amplifier for an XTAL biased in the sub-threshold operating regime. The amplifier of a XTAL oscillator can be duty cycled to save power, e.g., the XTAL driver can be turned off to save power when the amplitude of the XTAL oscillation reaches a maximum value in range; but be turned back on when the amplitude of the XTAL oscillation starts to decay, to maintain the oscillation before it stops. In addition or alternatively, a feedback control scheme to duty cycle the amplifier of a XTAL oscillator can be used to monitor the amplitude of the oscillation.

公开(公告)号：US09941838B2

公开(公告)日：2018-04-10

申请号：US15388711

申请日：2016-12-22

Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

Inventor： Benton H. Calhoun ,  Aatmesh Shrivastava

IPC: H03B5/36 ,  H03B5/04 ,  H03B5/32

CPC classification number: H03B5/364 ,  H03B5/04 ,  H03B5/32 ,  H03B2200/0012 ,  H03B2200/0046 ,  H03B2200/0064 ,  H03B2200/0082 ,  H03L5/00

Abstract: A low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power biases an amplifier for an XTAL in the sub-threshold operating regime. A feedback control scheme can be used to bias the amplifier for an XTAL biased in the sub-threshold operating regime. The amplifier of a XTAL oscillator can be duty cycled to save power, e.g., the XTAL driver can be turned off to save power when the amplitude of the XTAL oscillation reaches a maximum value in range; but be turned back on when the amplitude of the XTAL oscillation starts to decay, to maintain the oscillation before it stops. In addition or alternatively, a feedback control scheme to duty cycle the amplifier of a XTAL oscillator can be used to monitor the amplitude of the oscillation.

公开(公告)号：US09973086B2

公开(公告)日：2018-05-15

申请号：US15268783

申请日：2016-09-19

Applicant: University of Virginia Patent Foundation

Inventor： Benton Calhoun ,  Aatmesh Shrivastava

IPC: H02M1/088 ,  H02M3/156 ,  H02M3/158 ,  G05F1/565 ,  G05F1/46 ,  H02M1/00

CPC classification number: H02M3/158 ,  G05F1/462 ,  G05F1/565 ,  H02M1/088 ,  H02M3/156 ,  H02M2001/0025

Abstract: The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.

公开(公告)号：US20170366086A1

公开(公告)日：2017-12-21

申请号：US15640745

申请日：2017-07-03

Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

Inventor： Benton H. Calhoun ,  Aatmesh Shrivastava

IPC: H02M3/158 ,  H02M1/00

CPC classification number: H02M3/158 ,  H02M2001/009 ,  Y10T307/406

Abstract: In some embodiments, an apparatus includes a single-inductor multiple-output (SIMO) direct current (DC-DC) converter circuit, with the SIMO DC-DC converter circuit having a set of output nodes. The apparatus also includes a panoptic dynamic voltage scaling (PDVS) circuit operatively coupled to the SIMO DC-DC converter circuit, where the PDVS circuit has a set of operational blocks with each operational block from the set of operational blocks drawing power from one supply voltage rail from a set of supply voltage rails. Additionally, each output node from the set of output nodes is uniquely associated with a supply voltage rail from the set of supply voltage rails.

公开(公告)号：US20170098999A1

公开(公告)日：2017-04-06

申请号：US15382639

申请日：2016-12-17

Applicant: University of Virginia Patent Foundation

Inventor： Benton Calhoun ,  Aatmesh Shrivastava

IPC: H02M3/158 ,  H02M1/088

CPC classification number: H02M3/158 ,  G05F1/462 ,  G05F1/565 ,  H02M1/088 ,  H02M3/156 ,  H02M2001/0025

Abstract: The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.

公开(公告)号：US20170012531A1

公开(公告)日：2017-01-12

申请号：US15268783

申请日：2016-09-19

Applicant: University of Virginia Patent Foundation

Inventor： Benton Calhoun ,  Aatmesh Shrivastava

IPC: H02M3/158 ,  H02M1/088

CPC classification number: H02M3/158 ,  G05F1/462 ,  G05F1/565 ,  H02M1/088 ,  H02M3/156 ,  H02M2001/0025

Abstract: The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.

Abstract translation: 具有峰值电感电流控制和偏移补偿零检测的低输入电压升压转换器提供了一种升压转换器方案，用于从具有小输出电压的电源收集能量。 本文描述的一些实施例包括将IPEAK控制方案与偏移补偿和负载循环比较器组合的热电升压转换器，以使能够从低至5mV至10mV的TEG输入能量收集，并且峰值电感器电流独立于 输入电压和输出电压。 控制电路可以被配置为对输入电压（VIN）进行采样，然后产生具有与VIN成反比的持续时间的脉冲，以便控制升压转换器开关，使得产生基本恒定的峰值电感电流。

公开(公告)号：US20150207411A1

公开(公告)日：2015-07-23

申请号：US14600425

申请日：2015-01-20

Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

Inventor： Benton H. Calhoun ,  Aatmesh Shrivastava

IPC: H02M3/158

CPC classification number: H02M3/158 ,  G05F1/462 ,  G05F1/565 ,  H02M1/088 ,  H02M3/156 ,  H02M2001/0025

Abstract: The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.

Abstract translation: 具有峰值电感电流控制和偏移补偿零检测的低输入电压升压转换器提供了一种升压转换器方案，用于从具有小输出电压的电源收集能量。 本文描述的一些实施例包括将IPEAK控制方案与偏移补偿和负载循环比较器组合的热电升压转换器，以使能够从低至5mV至10mV的TEG输入能量收集，并且峰值电感器电流独立于 输入电压和输出电压。 控制电路可以被配置为对输入电压（VIN）进行采样，然后产生具有与VIN成反比的持续时间的脉冲，以便控制升压转换器开关，使得产生基本恒定的峰值电感电流。