| Switching power FM radio transmitter |
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With Switching Power Supply Technology continues to mature, to further broaden its applications. Switching Power Supply Continuous regulated power supply , compared with the traditional series has been a large improvement in efficiency, electromagnetic pollution, volume and reliability. On the other hand, the increasingly high demand for the latest solid-state FM broadcast transmitter power, switching power supply technology matures, constantly updated components, the application of the high reliability of the control chip is fully capable to meet the requirements of the FM broadcast transmitter. Actuator and power amplifier components in the solid-state FM transmitter universal switching power supply as energy support. The future of digital control and management put forward higher requirements for the switching power supply, intelligent, digital, small size and high reliability will be the development direction of switching power FM radio transmitter.
Switching Power Supply
Power is the heart of the entire power FM radio transmitter. Take into account the Transmitter Room equipment, electromagnetic compatibility, the overall efficiency of the transmitter, the reliability of the power supply, and the day-to-day maintenance and other issues, the switching power supply is undoubtedly the best choice of the solid-state FM transmitter power. The excellent characteristics of the switching power supply is mainly reflected in the following aspects. First: the smaller size. It can be integrated with the power amplifier assembly. Several hundred kHz switching frequency makes the filter impedance element volume scrunch, thereby both reduce transmitter weight and smaller volume, easy to transport and routine maintenance. Second: the efficiency is higher. Including the application of new devices such as the power switch MOSFET switching power supply circuit topology switching technology portfolio is to reduce losses and improve an important guarantee of the power system efficiency. Third: less electromagnetic pollution. Transmitter power supply equipped with electromagnetic interference (EMI) filter circuit and high spikes absorption circuit is an important guarantee to meet the requirements of the power of the current harmonics, it can not only improve the load characteristics of the power grid, reduce to the grid serious pollution, but also can reduce the harmonic interference to other network devices . Fourth: reliability has been further improved. Lightning protection, anti-induction or counterattack through a variety of protective measures and use of the voltage coated with three anti-paint (moisture-proof, anti-salt and mildew) printed circuit board can be the probability of failure to a minimum.
Switching Power Supply Application
The switching power supply through the power switches to a certain frequency continuously controlling the on-off operation, so that it can be through the energy storage element (such as inductors and capacitors) to provide the form of electricity supply to the transducer or load. Simply by changing the duty cycle, the switching frequency or phase, with an average output voltage or current can be controlled. The switching frequency of the switching power supply range from 20kHz to a few MHz. For power power greater than 90W workplace, switching power supply usually take two transform. Control power factor correction (PFC) converter and a DC / DC converter. Special mention should be made of the power factor correction circuit. It is in order to ensure that the input voltage and the current set-phase work. As a result, the power factor close to 1, the apparent power all converted to the active power, and thus the efficiency of the system has been improved. If there is no active PFC circuit, the input current to the peak value of the pulse in the form of narrow pulse width input switching power supply cause severe harmonic interference components. These harmonic components not only did not provide any energy to the load, but also cause transformers and other equipment fever. The active and passive power factor correction circuit is divided into two types. FM radio transmitter most of the switching power supply with active power factor correction circuit, it is composed of two parts of the AC / DC converter with active power factor correction and independent DC / DC converter. AC / DC converter include: EMI filter, slow-start circuit, bridge rectifier, PFC controller, power driver circuit and the converter circuit switch MOSFET (by the power, energy storage inductor L, fast recovery rectifier diode and filter capacitor etc.).
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12月10日（月）12:19 | コメント(0) | Economy | 管理
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