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STMicro has introduced a 1.2W mono differential input audio power amplifier, the TS4994, which will be used in mobile phones, laptops, PDAs and portable audio devices.
The TS4994 can carry 1.2W continuous RMS (mean square) power at 5V, 8ohm resistance, and the total distortion produced at 1KHz becomes 1%. Its differential design improves noise immunity. At 217 Hz ground input, the common mode rejection ratio is 85 dB and the power supply rejection ratio is 100 dB.
The TS4994 operates from a 2.5V to 5V supply, and its signal-controlled wait mode increases flexibility in use, reducing energy consumption to 10nA and enabling fast startup in 15ms.
In addition, the TS4994 has other superior features such as thermal shutdown protection, short circuit protection and more. At the same time, its common-mode feedback circuit can reduce the output voltage by more than half at any common-mode voltage.
On-Grid Inverter converts DC power to AC power for feeding back to the grid. The frequency of the output voltage of the grid-connected inverter needs to be the same as the grid frequency (50 or 60Hz), which is generally achieved by the oscillator in the machine, and the output voltage will also be limited not to exceed the grid voltage. Modern high-quality grid-connected inverters can have an output power factor of 1, which means that the output voltage and current phases are the same, and the phase difference between them and the grid voltage is within 1 degree. There is a microprocessor in the inverter that can sense the AC waveform of the grid, and according to this waveform, generate voltage and send it back to the grid. However, the electricity sent back to the grid needs to have a certain proportion of reactive power, so that the power of the nearby grid is within the allowable limit. noon) its voltage may rise too high.
If the power of the grid is cut off, the grid-connected inverter needs to be disconnected from the grid quickly. This is a regulation of the National Electrical Code (NEC) in the United States to ensure that when the grid is out of power, the grid-connected inverter will not provide power to the grid, and at this time the workers who maintain the grid will not be electrocuted.
Properly configured, grid-tie inverters allow a home to use alternative energy sources that it generates itself (such as solar or wind power) without cumbersome wiring and without the need for batteries. If there is insufficient alternative energy, the insufficient part will still be provided by electricity from the grid.
Grid-connected inverters are widely used in household photovoltaic power generation systems, commercial and industrial photovoltaic power plants and other scenarios. By connecting to the grid, they help to achieve efficient use of renewable energy and reduce carbon emissions, promoting sustainable development and popularization of clean energy.
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