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    Self-oscillating amplifier with high order loop filter
    1.
    发明授权
    Self-oscillating amplifier with high order loop filter 有权

    公开(公告)号：US10164581B2

    公开(公告)日：2018-12-25

    申请号：US15525182

    申请日：2015-11-27

    Applicant: ICEpower a/s

    Inventor： Kennet Skov Andersen

    IPC: H03F1/26 ,  H03F3/217 ,  H03F3/183

    Abstract: A self-oscillating amplifier system is disclosed. The system comprises a pulse modulator, a switching power amplification stage and a demodulation filter. Moreover, the system comprises a compensator including a forward filter which is a high order filter including a second order pole pair and a second order zero pair. Hereby it is possible to decrease the phase turn at low frequencies for better stability and increasing the gain of the control loop within the desired bandwidth.

    Startup pop minimization
    2.
    发明授权
    Startup pop minimization 有权

    公开(公告)号：US10050589B2

    公开(公告)日：2018-08-14

    申请号：US15528927

    申请日：2015-09-24

    Applicant: ICEpower a/s

    Inventor： Kennet Skov Andersen ,  Eskil Jørgensen

    IPC: H03F1/30 ,  H03F3/183 ,  H03F3/217

    Abstract: A switching power conversion system and a method for start-up pop minimization in an audio amplifier assembly are disclosed. The switching power conversion system comprises a forward path including a compensator, a switching power stage and a demodulation filter. The system further comprises a DC-servo and a pre-charging circuit and a sequence control unit configured for providing a start-up sequence where the compensator and DC-servo are correctly biased and a bootstrap capacitor within the switching power stage is charged before the switching power stage is started. Hereby, it is e.g. possible to minimize the audible start-up pop in audio amplifier assemblies.

    Dead time compensation
    3.
    发明授权
    Dead time compensation 有权

    公开(公告)号：US10148235B2

    公开(公告)日：2018-12-04

    申请号：US15577215

    申请日：2016-06-01

    Applicant: ICEPOWER A/S

    Inventor： Kennet Skov Andersen ,  Eskil Jørgensen

    IPC: H03F3/217 ,  H03K5/151 ,  H03K17/16

    Abstract: The invention relates to a compensator device for compensating signal dependent delay variations, including dead time and reverse recovery time, causing un-linearity in a Class-D amplifier where the compensator device comprises: a first input terminal for receiving an input pulse width modulated input PWM signal comprising pulses with falling flanks corresponding to a falling level transition and rising flanks corresponding to a rising level transition; and a second input terminal configured to receive the signal provided at an output switching node of a Class-D amplifier; an output terminal for providing a compensated output signal; and controllable delay means configured to receive and delay the pulse modulated input signal, thereby providing a delayed version of the input signal to said output terminal of the compensator device. The compensator device further comprises time measuring means configured for measuring the time between a transition of the signal provided at the output terminal of the compensator device and the corresponding transition of the signal at the output switching node of a Class-D amplifier and based on these measurements providing a control signal to the controllable delay means. An advantageous effect of the present invention is that the rising and falling level transition delays will be substantially similar thus substantially removing non-linearity and obtaining substantially correct pulse widths. The invention further relates to a corresponding method, a driver device and a Class-D amplifier.

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