Power supply system
A technology of power supply system and control system, which is applied in the direction of control/regulation system, electrical components, and adjustment of electric variables, etc., which can solve the problems of low efficiency and large power loss of power supply system 10, and achieve cost reduction, power loss reduction, and energy reduction The effect of the number of conversions
Inactive Publication Date: 2010-08-25
AMLINK SHANGHAI +1
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Problems solved by technology
from figure 1 It can be seen from the figure that the AC power is output from the rectifier circuit to the lamp tube, and the energy changes three times, resulting in large power loss and low efficiency of the entire power supply system 10
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[0010] figure 2 Shown is a schematic circuit diagram of a power supply system 20 applied to a liquid crystal television in a specific embodiment of the present invention. The power supply system 20 is used to drive a plurality of lamp tubes 208 and supply power to the control system 210 of the LCD TV at the same time, which includes a rectifier circuit 202 , a lamp tube driving circuit 204 and a control system power circuit 206 . Wherein, the lamp driving circuit 204 includes a single-stage power factor correction circuit 2042 , an inverter circuit 2044 and a current balance circuit 2046 . The AC power supply AC is converted into a first electrical signal V1 by the rectification circuit 202 and sent to the single-stage power factor correction circuit 2042 . The single-stage power factor correction circuit 2042 is connected between the rectification circuit 202 and the inverter circuit 2044, and is used to convert the received first electrical signal V1 into a second electric...
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The invention relates to a power supply system which comprises a rectifying circuit, a light tube drive circuit and a control system power supply circuit, wherein the rectifying circuit is connected to an external alternating current power supply and used for converting an external electrical signal provided by the alternating current power supply into a first electrical signal; the light tube drive circuit comprises a single-stage power factor correcting circuit, a current converter circuit and a current balancing circuit; the single-stage power factor correcting circuit is connected to the rectifying circuit and used for enabling the first electrical signal to form a second electrical signal after power factor correction and direct current / direct current conversion; the current converter circuit is connected to the single-stage power factor correcting circuit and used for converting the second electrical signal into an alternating current voltage signal which can drive a plurality of light tubes; and the current balancing circuit is used for balancing the current among all the light tubes. The power supply system provided by the invention integrates the power factor correcting circuit and a direct current / direct current converting circuit, reduces the frequency of energy conversion and effectively reduces the power loss in the switching process of a power supply.
Description
technical field [0001] The invention relates to a power supply system, in particular to a power supply system applied to liquid crystal television displays. Background technique [0002] Usually, the power supply system of the LCD TV includes two parts, one part supplies power for the backlight source of the LCD TV, and the other part supplies power for the control system of the LCD TV. figure 1 Shown is a circuit schematic diagram of a conventional power supply system 10 applied to LCD TVs. The power supply system 10 is used to drive a plurality of lamp tubes 110 and supply power to the control system 114, which includes a rectification circuit 102, a power factor correction circuit 104, a primary DC / DC conversion circuit (1) 106, and a secondary DC / DC conversion circuit ( 2) 112 and the inverter circuit 108. After being processed by the rectifier circuit 102, the AC power supply AC is converted into a DC voltage DC and transmitted to the power factor correction circuit 1...
Claims
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IPC IPC(8): H02M5/42H02M5/458H02M1/42H02M3/335
CPCY02B70/126Y02B70/10
Inventor 王家鹏
Owner AMLINK SHANGHAI