Abrégé

A electronic ballast startup output current-limited circuit for high voltage sodium lamp (4), which includes a triggering circuit (1) and a startup circuit (2), the startup circuit (2) has two transformer T3, T4, the triggering circuit (1) supplies starting signal to startup circuit (2); which characterized by connecting two relays J1, J2 between two transformers T3, T4 of startup circuit (2), secondary coils in said two transformers being connected in series, two relays acting due to the signal supplied by control circuit (3) after the startup circuit (2) generating strike voltage, the primary coil in two transformers which has the current limited function being converted from series connection to parallel connection. In this way, on the one hand, the bulb is able to trigger startup reliably, and the output power of electronic ballast can also meet the challenge; on the other hand, the resistance drops to one quarter which is in series connection after parallel connection, controls the heating-up of T3, T4, electronic ballast's whole temperature rise drops above 30%, improves stability and reliability of electronic ballast.

Classes IPC  ?

• H05B 41/14 - Circuits

Abrégé

A passive powerfactor correction circuit includes diodes (D1-D6), capacitors (C2-C4), and electrolytic capacitors (C5, C6). The anode of the diode (Dl) is connected to one terminal of the capacitor (C2) and the positive terminal of a rectifier circuit. The cathode of the diode (D1) is connected to the cathode of the diode (D3), the positive terminal of the capacitor (C5) and one terminal of the capacitor (C3). The anode of the diode (D6) is connected to the negative terminal of the capacitor (C5) and the cathode of the diode (D5). The cathode of the diode (D6) is connected to another terminal of the capacitor (C2), another terminal of the capacitor (C3), one terminal of the capacitor (C4), and the anode of the diode (D4). The cathode of the diode (D4) is connected to the anode of the diode (D3) and the positive terminal of the capacitor (C6). The cathode of the diode (D2) is connected to another terminal of the capacitor (C4) and the negative terminal of the rectifier circuit. The anode of the diode (D2) is connected to the negative terminal of the capacitor (C6) and the anode of the diode (D5).

Classes IPC  ?

• H02M 1/00 - Détails d'appareils pour transformation
• H05B 41/295 - Circuits dans lesquels la lampe est alimentée par une puissance obtenue à partir de courant continu au moyen d'un convertisseur, p. ex. par courant continu à haute tension utilisant des convertisseurs statiques comportant des dispositifs à semi-conducteurs et spécialement adaptés à des lampes munies d'électrodes de préchauffage, p. ex. à des lampes fluorescentes

Abrégé

A electronic ballast, comprises: filter circuit, bridge commutating circuit, power factor emendation circuit, high frequency switching circuit, startup circuit, low voltage DC power supply, and pulse generating and driver circuit. The pulse generating and driver circuit is comprised of full bridge drivers and four switching accelerators T11-T14. The output of the switching accelerators T11-T14 is connected to each limit-accelerate circuit that is comprised of resistance and capacitance in parallel connection. The each limit-accelerate circuit is connected to the corresponding output of full bridge drivers. The power can reach up to 1000w, due to the working manner of full bridge in high frequency switching circuit and pulse generating and driver circuit. The power wastage is also reduced by the switching accelerators and limit-accelerate circuit. The stability and reliability of circuit is promoted.

Classes IPC  ?

• H05B 41/14 - Circuits