| Aimed at the developing status of the testing power to the high-efficient fluorescent lamps both domestically and abroad, and based on the technical requirements to the testing power of fluorescent lamps, this thesis explores the system of numeral-control broad-band power signal source explores the system of numeral-control broad-band power signal source. The power signal source studied in this thesis with its maximum output power 300w, maximum voltage 500v, maximum ideal frequency 600 or 700 KHZ, and the harmonic distortion below 2%, is far close to the requirements of the international standards to the high-frequent power source in the testing circuit. The advanced DDS CMOS chip is used as the sine frequency source. Filtering circuit adopts the way that high pass and low pass are in series. The quality of the frequency signal directly determines the quality of the output-frequency signal. 12-bit DA CMOS chip output the voltage. The system in this thesis is considered as the source of voltage only from the perspective of voltage. The system costs a lot in the choice and experience to the simulated circuit equipments, in order to guarantee the linearity of the output voltage.The link of closed loop adopts the idea that the current and voltage are both in closed loop. Most of the circuits in this thesis are simulated. Furthermore, the working system is disturbed by the strong electromagnet ism produced by the high-frequent current. Therefore, it is also necessary for the system to avoid the disturbing of the electromagnetism. The light current part, power part, and output electric insulation are all of great importance.The system in this thesis is applied in the business production-making; therefore, it should also be taken account that every link of the hardware circuit, with giving attention to the capability index of the system, reasonably reduces the production cost, compresses the hardware circuit link, and avoids the dispensable cost waste.
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