Topic
Sine wave
About: Sine wave is a research topic. Over the lifetime, 12183 publications have been published within this topic receiving 93013 citations. The topic is also known as: sinusoid.
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Patent•
04 May 1979
TL;DR: In this article, the DC control voltage which determines the operation of the triacs is generated by a frequency discriminator circuit which receives its information from a load detecting device that is frequency modulated by load/speed related properties inherent to induction motors.
Abstract: A standard three phase induction motor starts with all three of its input connections connected to the three phase power line. Two of these connections are through triacs which remain continously conducting below said motor's particular most energy-efficient speed, which is above about 95% of synchronous speed. This assures full starting torque and undiminished overload handling capability. The triacs, in response to a control signal, may open the circuits over a sufficiently wide portion of the sine wave input voltage to substantially maintain said particular efficient speed under all rated load conditions. To assure smooth operation and maximum energy savings, the two triacs conduct differently at very light motor loads. The DC control voltage which determines the operation of the triacs is generated by a frequency discriminator circuit which receives its information from a load detecting device that is frequency modulated by load/speed related properties inherent to induction motors.
24 citations
Patent•
31 Aug 1982
TL;DR: In this paper, a filter for a pulse form of signal which substantially reduces sidebands, yet provides an output signal which is substantially free of jitter and at the same time has no inter-symbol interference is presented.
Abstract: A filter for a pulse form of signal which substantially reduces sidebands, yet provides an output signal which is substantially free of jitter and at the same time has no inter-symbol interference. The filter comprises a circuit for detecting the pulse type of signal and for substituting .pi. radians of a sine wave signal with a positive slope upon detection of a positive going leading edge of the pulse type signal and .pi. radians of a sine wave signal with a negative slope upon detection of a negative going trailing edge of the pulse type signal, at an output terminal.
24 citations
Patent•
01 Dec 1981
TL;DR: An A.C. power supply conditioner uses semi-conductor diodes (D1 and D2) and energy storage capacitors (C1 and C2) to produce a high D.c. voltage which is inverted at (TR 1) and (TR 2) to provide an output (L0, N0) without use of isolating transformer as mentioned in this paper.
Abstract: An A.C. power supply conditioner uses semi-conductor diodes (D1) and (D2) and energy storage capacitors (C1) and (C2) to produce a high D.C. voltage which is inverted at (TR1) and (TR2) to provide an A.C. output (L0, N0) without use of isolating transformer. A standby battery system includes a low voltage battery 'B' a DC/AC/DC converter 'E', and a charger 'F'. The inverter may provide a high frequency square wave, pulse-width modulated to form an effective sine wave at input frequency. In the event of a fault, switch G may be automatically changed-over.
24 citations
20 Oct 2009
TL;DR: In this article, the characteristics of Mega-Flux®, JNEX-Core®, amorphous and ferrite cores are compared for the inductor of buck-boost converter for Hybrid Electric Vehicles (HEVs).
Abstract: In this paper, the characteristics of Mega-Flux®, JNEX-Core®, amorphous and ferrite cores are compared for the inductor of buck-boost converter for Hybrid Electric Vehicles (HEVs). The core losses are analyzed at the condition of 10kHz sine wave excitations. Permeability fluctuations vs. temperature and magnetizing force will be analyzed and discussed. Under the specifications of buck-boost converter for 20kW THS-II, the power inductor will be designed with Mega-Flux®, JNEX-Core® and the informative simulation results will be provided with respect of dc bias characteristics, core and copper losses.
24 citations
04 May 2008
TL;DR: In this paper, a cost-effect controller system for 1 kW to 5 kW WSHGS with low DC voltage input (24 V DC or 48 V DC) and high output AC sine wave voltage (220 V AC).
Abstract: In the districts where solar energy and wind energy are naturally complementary, the application of wind-solar hybrid generation systems (WSHGS) can reduce the storage capacity of batteries and the total cost of the system compared with stand-alone PV or wind generation system. This paper presents a cost-effect controller system for 1 kW to 5 kW WSHGS with low DC voltage input (24 V DC or 48 V DC) and high output AC sine wave voltage (220 V AC). This controller system includes features as follows: (1) PWM chopping technology in charging control of batteries, which can make wind turbine and solar array operate at maximum power point so that the overall system efficiency can be improved greatly. (2) Constant voltage and limited current two-loops control of battery charge, which can make batteries in float charging state, enhance the cycle rate and prolong the life of the batteries. (3) SPWM conversion with front-end high frequency DC-DC modules in parallel and special microchip control IC with high performance-cost, which can accomplish sine wave output voltage with high reliability and high load efficiency.
24 citations