TH8448B - Electronic ballast - Google Patents

Abstract

The electronic ballast according to this invention consists of a fielder circuit. Bridge Rectifier The converter circuit, which, according to one invention model, is a compound converter. And according to another invention model is a return flight converter. which is a active filter to get a high input power factor and the harmonics of the input current are low. Inverter resonance circuit The converter circuit can operate by changing the inverter resonance circuit. without the need for integrated circuits, thus reducing the size and production costs An electronic ballast for gas discharge lamps with capacitors placed across the gas charging lamps at both ends. The capacitor is connected to the internal terminal of a material of the same or similar nature as the starter used in the iron core ballast circuit for discharge gas lamps. This material will be installed in the same position as the stator used in the iron core ballast circuit for gas discharge lamps. This is to make it easier to install in order to switch from using iron core ballasts to electronic ballasts. which makes it possible to reduce the number of electrical wires

Claims (1)

(Missing document on page 1) The output of the converter circuit is the anode of diode 1(12), and the negative terminal of the output of the converter circuit is connected to the cathode of diode 3(51), which is connected in series with the circuit of resistor (53), which is connected in parallel with capacitor 4(52) and connected to the negative terminal of the rectifier circuit (3), whose output terminal is connected in parallel with capacitor 1(13) and connected to the input of the DC/AC Resonance Inverter circuit, which consists of switch 2(23), switch 2(21), switch 3(22), switch 3(20), and has a load consisting of a gas discharge tube (33), whose terminals are connected across by capacitor 2(32) in series with a frequency-dependent resonance circuit consisting of an inductor 4(52). 2(30) is connected in series with inductor 3(31) and capacitor 3(34), with the load being connected across the active switch 2(23). 5. An electronic ballast circuit for gas discharge lamp ignition according to claim 4, in which active switch 1(11), active switch 2(23) and active switch 3(22) are controlled by changes in the current flowing through inductor 2(30), in which active switch 2(23) and active switch 3(22) operate alternately with approximately equal operating periods, in which active switch 1(11) can be selected to operate simultaneously with approximately equal operating periods to either active switch 2(23) or active switch 3(22). 6. An electronic ballast circuit for gas discharge lamp ignition according to claim 4, which is characterized by a flyback converter circuit in which active switch 1(11) 1(11) will be controlled by the change in the current flowing through the inverter resonance circuit. 7. The electronic ballast circuit for gas discharge lamp ignition under claim 1 or 4 is characterized by a capacitor (32) across the lamp terminals being enclosed within a container (300) in which the container (300) is provided with two external electrical terminals which are electrically connected to the capacitor (32), allowing it to be installed in a location where a conventional starter used with a conventional iron core ballast for fluorescent lamp ignition circuits (33) can be installed.