Reference signal generation method and system for switching converter in envelope tracking power supply
A switching converter and tracking power supply technology, which is applied to electrical components, output power conversion devices, etc., can solve the problems of reduced operating frequency efficiency, unguaranteed tracking accuracy, and heavy hardware computing workload, and achieves a reduction in hardware computing. resources, the effect of improving power supply efficiency
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Embodiment 1
[0044] figure 1 It is a schematic diagram of a typical envelope tracking power supply architecture. If the RF envelope signal generated by the envelope detection link is directly used as the reference signal of the switching converter after filtering, the amount of hardware calculation is too large, and the operating frequency of the switching converter changes drastically, resulting in a decrease in efficiency. The switching converter has a certain response time due to the influence of energy storage devices such as inductors and capacitors. Objectively, the switching converter cannot track the sharply changing reference signal. Since the output power of the envelope tracking power supply is generated by a combination of a linear amplifier and a switching converter, if the reference of the switching converter is constant, its output power cannot reflect the changing characteristics of the radio frequency signal and dynamically provide appropriate energy. Therefore, how to se...
example 1
[0062] Example 1: figure 2 Generate a schematic for the reference signal when there is only one set of switching converters in an envelope tracking power supply. The envelope tracking power supply contains a set of switching converters. The RF envelope signal is filtered through low-pass or band-pass or other types of filters, by taking N times the duty cycle of the switching converter as a fixed time interval, and taking the peak value of the filtered signal in this time interval as a constant reference value, And provided to the switching converter as its reference control signal.
[0063] (2) When multiple sets of converters are included
[0064] When the envelope tracking power supply contains multiple switching converters, the RF envelope signal is filtered by multiple frequency band filters to generate multiple filter signals, and the multiple filter signals generated are respectively within a defined time interval A constant reference value is determined within, and...
example 2
[0065] Example 2: image 3 Generate a schematic for the first reference signal when two sets of switching converters are present in an envelope tracking power supply. The envelope tracking power supply contains 2 sets of switching converters. The RF envelope signal is filtered through a low-pass or band-pass or other type of filter. If the type of filter 1 is a low-pass filter, and the type of filter 2 is a high-pass filter, then the RF envelope signal passes through the low-pass filter 1 and high-pass filter 2 respectively to obtain signals 1 and 2, by taking the switch N times the duty cycle of the converter is a fixed time interval, and the peak values of the filtered signals 1 and 2 in this time interval are taken as constant reference values to obtain Vref.1 and Vref.2, which are provided to the switching converter as its reference control signal .
[0066] In this embodiment, the form of the filter is not limited, to image 3 The structure in is taken as an examp...
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