Patents by Inventor Michael T. Engelhardt

Michael T. Engelhardt has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Predictive ripple-cancelling signal into error amplifier of switch mode power supply
    Patent number: 10270330
    Abstract: A predicted ripple in the feedback voltage of a switching converter is generated, based on the ripple over a certain number of recent switching cycles. The DC portion of the feedback voltage is filtered out. This predicted feedback voltage ripple is then added to a fixed reference voltage to create a compensated reference voltage. The compensated reference voltage is applied to the non-inverting input of an error amplifier, and the feedback voltage (having a DC component and ripple) is applied to the inverting input of the error amplifier. Thus, substantially the same ripple component is applied to both inputs and cancels out. Therefore, the output of the error amplifier is not affected by the ripple in the feedback voltage, and a non-rippling control voltage is generated by the error amplifier. As a result, the gain-bandwidth product of the converter can be increased for faster response to transients.
    Type: Grant
    Filed: May 3, 2018
    Date of Patent: April 23, 2019
    Assignee: Linear Technology Holding LLC
    Inventors: Michael T. Engelhardt, Leonard Shtargot
  • PREDICTIVE RIPPLE-CANCELLING SIGNAL INTO ERROR AMPLIFIER OF SWITCH MODE POWER SUPPLY
    Publication number: 20180331618
    Abstract: A predicted ripple in the feedback voltage of a switching converter is generated, based on the ripple over a certain number of recent switching cycles. The DC portion of the feedback voltage is filtered out. This predicted feedback voltage ripple is then added to a fixed reference voltage to create a compensated reference voltage. The compensated reference voltage is applied to the non-inverting input of an error amplifier, and the feedback voltage (having a DC component and ripple) is applied to the inverting input of the error amplifier. Thus, substantially the same ripple component is applied to both inputs and cancels out. Therefore, the output of the error amplifier is not affected by the ripple in the feedback voltage, and a non-rippling control voltage is generated by the error amplifier. As a result, the gain-bandwidth product of the converter can be increased for faster response to transients.
    Type: Application
    Filed: May 3, 2018
    Publication date: November 15, 2018
    Inventors: Michael T. Engelhardt, Leonard Shtargot
  • Predictive ripple-cancelling signal into error amplifier of switch mode power supply
    Patent number: 9966832
    Abstract: A predicted ripple in the feedback voltage of a switching converter is generated, based on the ripple over a certain number of recent switching cycles. The DC portion of the feedback voltage is filtered out. This predicted feedback voltage ripple is then added to a fixed reference voltage to create a compensated reference voltage. The compensated reference voltage is applied to the non-inverting input of an error amplifier, and the feedback voltage (having a DC component and ripple) is applied to the inverting input of the error amplifier. Thus, substantially the same ripple component is applied to both inputs and cancels out. Therefore, the output of the error amplifier is not affected by the ripple in the feedback voltage, and a non-rippling control voltage is generated by the error amplifier. As a result, the gain-bandwidth product of the converter can be increased for faster response to transients.
    Type: Grant
    Filed: May 9, 2017
    Date of Patent: May 8, 2018
    Assignee: Linear Technology Corporation
    Inventors: Michael T. Engelhardt, Leonard Shtargot