The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A flexible-controlled high power density electronic ballast for automotive high intensity discharge (HID) lamp is proposed. This paper also introduces a decreased power control method for the startup phase of the headlamp. Conventional digital controlled automotive HID electronic ballast needs extra analog IC and realizes the power control by current control means. The proposed one uses one high speed...
A constant power control strategy of electronic ballast for metal halide lamps is proposed in this paper. It is based on digital control with MCU controller. The lamp current is adjusted to ensure the lamp voltage variation in a small range according to the negative resistance characteristics of the metal halide lamps. Therefore, the lamp power is maintained constantly without any calculation. It...
Electronic ballast requires a high voltage igniter to start up the HID lamps. An improved parallel igniter is proposed in this paper. The basic mechanism of it has been analysed and design principle is developed. Based on this parallel igniter, the lamp series inductor can be optimized separately. This improves the performance of both the igniter and lamp inductor. The simulation and experimental...
A novel and efficacious constant power control strategy of electronic ballast for HID lamp is proposed in this paper. The constant power control gear mainly consists of an 8-bit micro-controller and a PWM control IC. The micro-controller samples the lamp voltage, and calculates an appropriate value of lamp current. The PWM IC controls the lamp current equal to the calculated current value. Thus constant...
This paper proposed a power control strategy of the general three-stage electronic ballast (Eballast) for HID lamps. This control strategy utilizes the dc input current as the power level signal. Since the input of the DC/DC stage is constant, the control of the input current ensures the control of the lamp power. This approach is more feasible for digital controlled Eballast. As it only needs one...
Using conventional three-stage low-frequency square-wave electronic ballast, low-wattage MH lamps may have trouble in starting-up instantly and smoothly. This paper investigates the special starting-up characteristics of low-wattage MH lamps and presents some novel control strategy according to the lamps' special characteristics. A prototype of 70 W electronic ballast with the new control circuit...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.