Novel transformer active filters
Novel transformer active filters are proposed to obtain high attenuation of voltage or current ripple without deteriorating the transient response of the system considered. Experimental results show that the scheme gives good steady-state performance of the power supply. >
Comparison of four control methods to active power filters applied in accelerator power supplies
This paper proposes a hybrid filter structure consisting of a passive power filter and a DC active power filter (DCAPF) applied in high current, high precision and low ripple accelerator power supplies. The configuration of the power system with the DCAPF is firstly introduced. Then four control schemes to obtain the reference signal for the DCAPF control circuit is presented. For each method, the basic operation principle of eliminating output voltage and current ripples is analyzed in detail. Furthermore, the compensation characteristics of each method is discussed and compared. To verify the proposed circuit configuration and the control methods, the testing results of the practical field operation of the DCAPF with a 120kW accelerator power supply is introduced. By adopting the control method of detecting the load ripple voltage, the output current ripple factor and tracking accuracy of the accelerator power supply achieve 8.87/spl times/10/sup -6/ (peak-to-peak) and 1/spl times/10/sup -4/ respectively, which is very satisfactory for this kind of power supplies. The dynamic response of the accelerator power supply is also greatly improved through the application of the DCAPF.
Cultivated Power: Flowers, Culture, and Politics in the Reign of Louis XIV
Ch. 1. Disorderly flowers Floral seduction: death, sex, and flowers Trading on the power of flowers Ch. 2. Refashioning the culture of flowers in early modern France Curiosity and flowers The sweet society of the curious florists Ch. 3. Cultivating the flower The florists' flowers Unlocking the door to the temple of flora Ch. 4. Cultivating the man The theater of the goddess of flowers Nature into art "Jardin d'Hyver," or flowers in print Ch. 5. Cultivating the king Royal precedents Flowers in the garden of Louis XIV Floral mercantilism Flowers and the "Histoire du Roi" Appendices A. Extract of the inventory by ... Sieur Cottereau of flowering plants and bulbs that he offers to furnish for the gardens of the royal households B. Plants included in Jean Donneau de Vise's Histoire de Louis le Grand