Topic
Pulse-frequency modulation
About: Pulse-frequency modulation is a research topic. Over the lifetime, 4151 publications have been published within this topic receiving 53039 citations. The topic is also known as: PFM.
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Patent•
20 Jan 2004
TL;DR: In this article, a dual-mode pulse frequency modulation boost converter operates in a hysteretic mode during light load currents to regulate an output voltage using a substantially fixed peak switching current.
Abstract: A dual-mode pulse frequency modulation boost converter operates in a hysteretic mode during light load currents to regulate an output voltage using a substantially fixed peak switching current and operates in a continuous mode during heavy load currents to regulate the output voltage using a variable peak switching current. The boost converter senses load power to automatically switch between the hysteretic mode and the continuous mode.
38 citations
Patent•
14 Feb 1944
TL;DR: In this paper, an electrical signalling system of the type in which the signals, for example speech signals, are transmitted as fixed-amplitude pulses of radio frequency occurring at a fixed repetition frequency higher than the highest signal frequency it is desired to transmit is described.
Abstract: The present invention relates to electrical signalling systems of the type in which the signals, for example speech signals, are transmitted as fixed-amplitude pulses of radio frequency occurring at a fixed repetition frequency higher than the highest signal frequency it is desired to transmit...
38 citations
Patent•
13 Dec 1996
TL;DR: In this paper, a short range magnetically coupled wireless communication system employs time variant modulation of a high repetition rate pulse stream and magnetic coupling between a transmission magnetic element and a receiving magnetic element.
Abstract: A short range magnetically coupled wireless communication system employs time variant modulation of a high repetition rate pulse stream and magnetic coupling between a transmission magnetic element and a receiving magnetic element. The pulse stream is modulated by an input audio frequency signal in the time domain, for example, through pulse position modulation, pulse width modulation or pulse symmetry modulation. The receiving magnetic element is coupled to a demodulator circuit which detects the transmitted pulses induced in the receiving magnetic element and reproduces the audio frequency signal. Transmission over short range is thus efficiently accomplished through magnetic coupling in a simple, low cost, low power consumption communication system.
37 citations
17 Nov 2003
TL;DR: In this article, the authors compare the merits and demerits of SVPWM, SINROW modulation, and one-cycle control for variable frequency and adjusting speed systems.
Abstract: Sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) are the most popular modulation strategies applied to variable frequency and adjusting speed systems, and there are diverges in comparing the merits and demerits of their own Also there is another modulation strategy called one-cycle control This paper gathers the three strategies and does some comparisons through simulation based on a simulation tool-PSIM, and has drawn some profitable conclusions
37 citations
Patent•
29 Jul 2011TL;DR: A switching regulator is a multiphase converter which includes a plurality of main phases configured to covert a power supply voltage to a lower voltage for application to an electronic device at different load conditions as discussed by the authors.
Abstract: A switching regulator includes a multiphase converter which includes a plurality of main phases configured to covert a power supply voltage to a lower voltage for application to an electronic device at different load conditions. The switching regulator also includes an auxiliary phase configured to operate in a pulse frequency modulation mode during a light load condition so that power is supplied to the electronic device by at least the auxiliary phase during the light load condition.
37 citations