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Patent Agency Ranking
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
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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公开(公告)号：US09991852B2
公开(公告)日：2018-06-05
申请号：US15528934
申请日：2015-11-02
Applicant: ICEpower a/s
Inventor： Kennet Skov Andersen
CPC classification number: H03F1/305 , H03F1/02 , H03F3/183 , H03F3/187 , H03F3/217 , H03F3/2173 , H03F2200/03 , H03F2200/129 , H03F2200/135 , H03F2200/144 , H03F2200/156 , H03F2200/258 , H03F2200/342 , H03F2200/426 , H03F2200/441 , H03F2200/444 , H03F2200/66 , H03F2200/78 , H03G3/301 , H03G3/348 , H03G2201/106
Abstract: A close-down pop reduction system and a method for close-down pop reduction in an audio amplifier assembly are disclosed. The switching power conversion system comprises a forward path having a compensator and a switching power stage and a signal path from an output of a comparator in the switching power stage to a sequence control unit. The signal path includes a close-down timing circuit configured to provide a timing signal. The sequence control unit is configured to eliminate the input signal, increase the switch frequency of the close-down pop reduction system and disable the switching power stage at a moment in time within a PWM pulse of the switching power stage. Hereby, it is e.g. possible to minimize the audible pop during close-down of audio amplifier assemblies.
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公开(公告)号：US20170324382A1
公开(公告)日：2017-11-09
申请号：US15525182
申请日：2015-11-27
Applicant: ICEpower a/s
Inventor： Kennet Skov Andersen
CPC classification number: H03F1/26 , H03F3/183 , H03F3/217 , H03F2200/03 , H03F2200/129 , H03F2200/171
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.
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公开(公告)号：US20170317651A1
公开(公告)日：2017-11-02
申请号：US15528934
申请日：2015-11-02
Applicant: ICEpower a/s
Inventor： Kennet Skov Andersen
CPC classification number: H03F1/305 , H03F1/02 , H03F3/183 , H03F3/187 , H03F3/217 , H03F3/2173 , H03F2200/03 , H03F2200/129 , H03F2200/135 , H03F2200/144 , H03F2200/156 , H03F2200/258 , H03F2200/342 , H03F2200/426 , H03F2200/441 , H03F2200/444 , H03F2200/66 , H03F2200/78 , H03G3/301 , H03G3/348 , H03G2201/106
Abstract: A close-down pop reduction system and a method for close-down pop reduction in an audio amplifier assembly are disclosed. The switching power conversion system comprises a forward path having a compensator and a switching power stage and a signal path from an output of a comparator in the switching power stage to a sequence control unit. The signal path includes a close-down timing circuit configured to provide a timing signal. The sequence control unit is configured to eliminate the input signal, increase the switch frequency of the close-down pop reduction system and disable the switching power stage at a moment in time within a PWM pulse of the switching power stage. Hereby, it is e.g. possible to minimize the audible pop during close-down of audio amplifier assemblies.
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公开(公告)号：US20140077885A1
公开(公告)日：2014-03-20
申请号：US14115371
申请日：2012-06-14
Applicant: BANG & OLUFSEN ICEPOWER A/S
Inventor： Mads Peter Frium
CPC classification number: H02M3/33576 , H02M3/33569 , H02M2001/0058 , H03F3/217 , H03F3/2173 , Y02B70/1491
Abstract: A power converter with positive and negative supply rail outputs for feeding a single ended class D amplifier, the converter comprising a transformer arrangement, a supply pump reduction arrangement connected between the secondary windings and the positive and negative supply rail outputs, and a boost drive mode switching arrangement. A controller is adapted to control the power converter in a negate drive mode and a boost drive mode, wherein the output voltage in the boost mode is increased by means of the transformer and the boost drive mode switching arrangement. The output voltages on the positive and negative rails can be generated at two different output voltage levels without changing the duty cycle or dead time of the control signals.
Abstract translation: 一种具有正和负电源轨输出的功率转换器，用于馈送单端D类放大器，转换器包括变压器布置，连接在次级绕组与正和负电源轨输出之间的供应泵减速装置，以及升压驱动模式 切换布置。 控制器适于在负驱动模式和升压驱动模式下控制功率转换器，其中升压模式中的输出电压通过变压器和升压驱动模式切换装置增加。 正负极轨上的输出电压可以在两个不同的输出电压电平下产生，而不会改变控制信号的占空比或死区时间。
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