Self-oscillating transformerless electronic ballast
An electronic ballast and self-vibration technology, applied in the direction of electric light source, electrical components, climate sustainability, etc., can solve the problems of complex device structure, reduce structural complexity and circuit cost, low energy efficiency, etc.
Inactive Publication Date: 2010-09-29
李声汉
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Problems solved by technology
[0002] The operation of conventional magnetic wound ballasts has many known disadvantages such as low energy efficiency and high flicker
So just develop the electronic ballast (electronic ballast) to overcome the above-mentioned shortcoming, but the existing electronic ballast usually uses two switches to convert the DC signal into a high-frequency AC signal to start and continuously light the discharge lamp. Switches need to be driven by integrated circuits, resulting in complex device structures and high circuit costs
Other operating mechanisms for starting discharge lamps include the use of resistive electronic ballasts with glow bottle starters, but they still cannot significantly reduce structural complexity and circuit costs
Method used
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[0047] Please refer to figure 1 , figure 1 It is a schematic circuit diagram of the electronic ballast according to the first embodiment of the present invention. Such as figure 1 As shown, the light source system 100 includes an AC input power source 101 , a lamp tube 190 , and an electronic ballast 110 . The AC input power supply 101 is used to generate an AC input voltage. The lamp 190 may be a discharge lamp having a first filament 191 and a second filament 193 . In one embodiment, the lamp 190 is a hot-cathode fluorescent lamp (HCFL). In another embodiment, the lamp 190 is a cold-cathode fluorescent lamp (CCFL) or an external electrode fluorescent lamp (EEFL). The first filament 191 is coupled between the first node 181 and the second node 182 , and the second filament 193 is coupled between the third node 183 and the fourth node 184 . The electronic ballast 110 is coupled to the AC input power source 101 and the lamp tube 190 , and is used for performing power conv...
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A self-oscillating transformerless electronic ballast includes a rectifier circuit, a power switch, a bias circuit, a voltage divider and a power adjusting circuit. The rectifier circuit converts an AC input voltage to a DC voltage so as to supply a bias voltage to the power switch. The power switch is used for supplying a sine wave drive signal to drive the lamp tube. The voltage divider performs a voltage dividing treatment to the signal fed back by the lamp tube so as to generate the signal necessary for driving the power switch. The power adjusting circuit is used for limiting the drive power supplied to the power switch so as to adjust the drive for the lamp tube.
Description
technical field [0001] The present invention relates to an electronic ballast, in particular to a self-oscillating electronic ballast without a transformer, the feedback path of which only uses two-terminal components such as inductance and capacitance to cooperate with the lamp tube impedance to provide a feedback mechanism. Background technique [0002] The operation of conventional magnetic wire-wound ballasts has many known disadvantages, such as low energy efficiency and high flicker. So just develop the electronic ballast (electronic ballast) to overcome the above-mentioned shortcoming, but the existing electronic ballast usually uses two switches to convert the DC signal into a high-frequency AC signal to start and continuously light the discharge lamp. The switch needs to be driven by an integrated circuit, resulting in a complicated device structure and high circuit cost. Other operating mechanisms for starting the discharge lamp include using a resistive electroni...
Claims
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IPC IPC(8): H05B41/295
CPCY02B20/00
Inventor 李声汉
Owner 李声汉