专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

51. 发明专利

GB2527637A Switchable secondary playback path 未知
公开(公告)号：GB2527637A
公开(公告)日：2015-12-30
申请号：GB201506258
申请日：2015-04-13
申请人： CIRRUS LOGIC INC
发明人： DAS TEJASVI , MELANSON JOHN L , TUCKER JOHN C , FEI XIAOFAN
IPC分类号： H03M1/66 , H03M3/02
摘要： At high digital input signal magnitudes, a controller 20 selects a sigma-delta DAC circuit 12A with good linearity and low noise, while at low signal magnitudes the controller 20 selects a DAC circuit 13A with low power consumption. The channels may be weighted (44,46, figure 4) in a complementary fashion in dependence on the input signal magnitude. In a multi-stage noise shaping (MASH) arrangement (figure 5), the input signal for the low power DAC circuit is a quantization error signal from a digital delta sigma modulator.Â The digital input signal may be subject to a low pass filter (72, figure 6) in the higher power DAC channel, a high frequency residue being generated by a subtraction circuit (86, figure 6) and fed to the low power DAC.

52. 发明专利

GB2482946A Dimmer output emulation 未知
公开(公告)号：GB2482946A
公开(公告)日：2012-02-22
申请号：GB201112860
申请日：2011-07-26
申请人： CIRRUS LOGIC INC
发明人： MELANSON JOHN L
IPC分类号： H05B44/00
摘要： A dimmer output voltage emulator 408 causes a power converter interface circuit 402 to generate an emulated dimmer output voltage which emulates part of a cycle of an alternating current dimmer output. The emulated dimmer output voltage can decrease over time in multiple segments (fig 11) or with a concave parabolic waveform (fig 7, 708). The emulator can provide current (fig 6, IR) that interacts with components of the power interface circuit such as capacitor 412 and can comprise a pull-down circuit (fig 6, 602) to decrease the emulated voltage during a for a first period and a glue circuit (fig 6, 604) to hold the dimmer output voltage below a threshold for a second period. The first period can be from when a dimmer triac 106 ceases conduction during an AC supply voltage cycle until the supply voltage is below a threshold and the second period from then until the supply voltage begins to increase, when the triac fires. The emulated dimmer output voltage can correspond to an actual dimmer output voltage but is unaffected by a non-ideal dimmer output voltage, such as when a triac-based dimmer 102 prematurely shuts-down. By generating an emulated dimmer output voltage, the energy delivered to a load 310, such as a lamp, lighting system or light emitting diode (LED), corresponds to a dimming level setting.

53. 发明专利

GB2450645B Delta sigma modulator analog-to-digital converters with quantizer output prediction and comparator reduction 未知
公开(公告)号：GB2450645B
公开(公告)日：2011-09-21
申请号：GB0817439
申请日：2007-03-09
申请人： CIRRUS LOGIC INC
发明人： MELANSON JOHN L
IPC分类号： H03M3/04
摘要： The quantizers of delta sigma modulators in the signal processing systems described herein use a reduced set of comparators for quantization by predetermining and maintaining a maximum per cycle deviation d between a loop filter output signal V LF (t) and a predicted quantizer output signal q est . In at least one embodiment, a maximum quantizer level deviation d is defined in terms of a number of quantization levels. Thus, the number of comparators in a quantizer needed to quantize the quantizer input signal V in (t) is based on the maximum quantizer level deviation d. In addition to using fewer comparators than available quantization output levels N, the quantizers can use an even number of comparators M, in contrast to comparable conventional reduced comparator ADC tracking quantizer designs using M+1 number of comparators, where N and Mare integers and M

54. 发明专利

GB2446538B Centered-pulse consecutive edge modulation (cem) method and apparatus 未知
公开(公告)号：GB2446538B
公开(公告)日：2010-10-13
申请号：GB0809367
申请日：2006-11-20
申请人： CIRRUS LOGIC INC
发明人： MELANSON JOHN L , HAGGE MELVIN L , TROTTER BRIAND DAVID
IPC分类号： H03M3/04 , H03M7/00

55. 发明专利

GB2468239A Switch state controller with a sense current generated operating voltage 未知
公开(公告)号：GB2468239A
公开(公告)日：2010-09-01
申请号：GB201009005
申请日：2009-01-29
申请人： CIRRUS LOGIC INC
发明人： MELANSON JOHN L , THOMPSON KARL , NANDA KARTIK , GAETANO MAURO
IPC分类号： H02M3/335 , H02M1/08 , H02M1/42
摘要： A power supply system and method includes a switch state controller that is operational to control a switching power converter during certain power loss conditions that cause conventional switch state controllers to have diminished or no functionality. In at least one embodiment, during certain power loss conditions, such as when an auxiliary power supply is in standby mode or when the switching power converter is not operating, a power supply for the switch state controller does not provide sufficient operating power to the switch state controller during certain power loss conditions. In at least one embodiment, during such power loss conditions power is generated for the switch state controller using sense input and/or sense output currents of the switching power converter to allow an integrated circuit (IC) switch state controller to generate a control signal to control a switch of the switching power converter.

56. 发明专利

DE602006013989D1 未知
公开(公告)号：DE602006013989D1
公开(公告)日：2010-06-10
申请号：DE602006013989
申请日：2006-07-13
申请人： CIRRUS LOGIC INC
发明人： MELANSON JOHN L
IPC分类号： H03M7/34
摘要： A digital signal processing system includes a delta sigma modulator that maintains a low pass output during quantizer overload prevention conditions. In at least one embodiment, the delta sigma modulator includes a quantizer overload protected delta sigma modulator with an N-order feedback-type loop filter. A quantizer of the delta sigma modulator provides feedback to at least the first two filter stages of the loop filter. The loop filter includes at least N successive filter stages and limits an output of an initial filter stage during quantizer overload prevention conditions. If limiting the output of the initial filter stage is insufficient to prevent quantizer overload, the delta sigma modulator can progressively limit an output of at least the next successive filter stage to prevent quantizer overload, where N is a positive integer greater than or equal to two (2).

57. 发明专利

GB2482371B Integrated circuit switching power supply controller with selectable buck mode operation 未知
公开(公告)号：GB2482371B
公开(公告)日：2015-07-08
申请号：GB201109322
申请日：2011-06-03
申请人： CIRRUS LOGIC INC
发明人： SINGH RAHUL , MELANSON JOHN L
IPC分类号： H02M3/335 , H02M3/156 , H05B44/00
摘要： An integrated circuit (IC) controller for a switching power supply has a selectable operating mode for supporting multiple switching power supply topologies. The IC controls current by controlling a cycle rate of the switching power supply to provide a constant or variable output current, which may be provided to lighting devices such as light-emitting diodes (LEDs). The selectable operating mode includes at least a buck converter operating mode and another operating mode, which may be a flyback converter operating mode.

58. 发明专利

GB2482946B Dimmer output emulation 未知
公开(公告)号：GB2482946B
公开(公告)日：2015-03-18
申请号：GB201112860
申请日：2011-07-26
申请人： CIRRUS LOGIC INC
发明人： MELANSON JOHN L
IPC分类号： H05B44/00
摘要： A lighting system includes a dimmer output voltage emulator to cause a power converter interface circuit to generate an emulated dimmer output voltage. In at least one embodiment, the emulated dimmer output voltage corresponds to an actual dimmer output voltage but is unaffected by non-idealities in the dimmer output voltage, such as premature shut-down of a triac-based dimmer. By generating an emulated dimmer output voltage, the energy delivered to a load, such as a lamp, corresponds to a dimming level setting.

59. 发明专利

GB2468239B Switch state controller with a sense current generated operating voltage 未知
公开(公告)号：GB2468239B
公开(公告)日：2012-08-15
申请号：GB201009005
申请日：2009-01-29
申请人： CIRRUS LOGIC INC
发明人： MELANSON JOHN L , THOMPSON KARL , NANDA KARTIK , GAETANO MAURO
IPC分类号： H02M3/335 , H02M1/08 , H02M1/42
摘要： A power supply system and method includes a switch state controller that is operational to control a switching power converter during certain power loss conditions that cause conventional switch state controllers to have diminished or no functionality. In at least one embodiment, during certain power loss conditions, such as when an auxiliary power supply is in standby mode or when the switching power converter is not operating, a power supply for the switch state controller does not provide sufficient operating power to the switch state controller during certain power loss conditions. In at least one embodiment, during such power loss conditions power is generated for the switch state controller using sense input and/or sense output currents of the switching power converter to allow an integrated circuit (IC) switch state controller to generate a control signal to control a switch of the switching power converter.

60. 发明专利

GB2475668A Adjustable constant current source with continuous conduction mode ("CCM") and discontinuous conduction mode ("DCM") operation 未知
公开(公告)号：GB2475668A
公开(公告)日：2011-05-25
申请号：GB201105424
申请日：2009-09-25
申请人： CIRRUS LOGIC INC
发明人： MELANSON JOHN L
IPC分类号： H02M3/156 , H02M3/158 , H05B44/00
摘要： A converter system and method of operating a converter system are disclosed. The converter system comprises a converter power stage that can operate in a Discontinuous Conduction Mode (DCM) in a range of output currents and a Contunious Conduction Mods (CCM) hi another range of output currents, The converter power stage includes at least an inductor with an inductor value and, and control switch, The converter power stage provides an average current. A current controller is coupled to the converter power stage. When the converter power stage operates in DCM, She converter power stage provides the average current and the current controller is configured to measure the inductor value of the inductor. Furthermore, the current controller can also he configured to measure an input-to-output conversion ratio from the converter power stage.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式