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    • 3. 发明授权
    • Pulse-width modulated (PWM) audio power amplifier having output signal magnitude controlled pulse voltage and switching frequency
    • 脉冲宽度调制(PWM)音频功率放大器具有输出信号幅值受控的脉冲电压和开关频率
    • US08093951B1
    • 2012-01-10
    • US12568667
    • 2009-09-28
    • Lingli ZhangDan ShenJohann GaboriauEric J. Swanson
    • Lingli ZhangDan ShenJohann GaboriauEric J. Swanson
    • H03F3/217H03F3/04
    • H03F3/217H03F2200/03H03F2200/114H03F2200/351
    • An audio switching power amplifier having an output pulse voltage selected in conformity with an indication of the output signal amplitude provides lower electromagnetic interference (EMI) in class-D amplifier implementations, in particular, in inductor-less designs. The output pulse voltage may be selected by providing multiple switching circuits, such as half or fully bridge switches, with each switching circuit connected to a different power supply. One of the switching circuits is activated by the switching controller, while the others are disabled, providing selection of the output pulse voltage. Selection of a lower pulse voltage, when the maximum voltage is not required, reduces the generated EMI. The switching frequency of the class-D amplifier may also be controlled in conformity with the output signal amplitude, so that at higher output levels a lower switching rate is selected, reducing the generated EMI.
    • 具有根据输出信号幅度的指示选择的输出脉冲电压的音频开关功率放大器在D类放大器实现中尤其是在无电感设计中提供较低的电磁干扰(EMI)。 可以通过提供多个开关电路(例如半桥或全桥开关)来选择输出脉冲电压,每个开关电路连接到不同的电源。 其中一个开关电路由开关控制器激活,而其他开关电路被禁用,提供输出脉冲电压的选择。 当不需要最大电压时,选择较低的脉冲电压可以减少产生的EMI。 D类放大器的开关频率也可以根据输出信号幅度进行控制,从而在较高的输出电平下选择较低的开关速率,从而减少产生的EMI。
    • 10. 发明授权
    • Thermal overload protection circuit and method for protecting switching power amplifier circuits
    • 热过载保护电路和保护开关功率放大器电路的方法
    • US07570118B1
    • 2009-08-04
    • US11862338
    • 2007-09-27
    • Johann GaboriauLingli ZhangRandy Boudreaux
    • Johann GaboriauLingli ZhangRandy Boudreaux
    • H03F1/52
    • H03F3/2173H03F1/523H03K17/0822H03K17/6872H03K2017/0806
    • A thermal overload protection circuit and method for protecting switching power amplifier circuits provides protection against latch-up and other failures due to energy returned from an inductive load when the amplifier output is disabled in response to a thermal overload condition. Upon detection of a thermal overload condition, rather than immediately disabling the switching power output stage, the switching power output stage is driven toward a fifty-percent duty cycle of operation for a predetermined time period so that energy stored in inductance of the load is reduced, preventing back-currents that would otherwise may cause latch-up within the integrated circuit when the switching power output stage is disabled. After the time period has elapsed, the switching power output stage is disabled. Alternatively, the current through the inductive load is measured and the switching power stage is disabled after the magnitude of the current has fallen below a threshold.
    • 用于保护开关功率放大器电路的热过载保护电路和方法提供了当放大器输出响应于热过载状态被禁用时由于由感性负载返回的能量而产生的闩锁和其它故障的保护。 在检测到热过载状态时,不是立即禁用开关功率输出级,所以开关功率输出级被驱动到达预定时间段的操作的百分之五十的占空比,使得存储在负载的电感中的能量减少 ,当禁止开关电源输出级时,防止否则可能导致集成电路内的闩锁的反向电流。 经过了一段时间后,开关电源输出级被禁止。 或者,测量通过电感负载的电流,并且在电流的大小已经降到阈值以下之前禁用开关功率级。