Device and method for converting voltage using switch mode
A technology of converting voltage and switching mode, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., which can solve problems such as annoying, increasing circuit complexity, increasing cost, etc., to reduce material waste, reduce electromagnetic interference, and reduce the effect of turns ratio
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[0020] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0021] In flat color TVs, switching step-down circuits are generally used to supply power to digital circuits. figure 1 It is a typical circuit of this kind of scheme. It is composed of switching integrated circuit IC1, inductor L1, freewheeling diode D1, output capacitor C1 and so on. The input voltage is Ui and the output voltage is Uo.
[0022] It works like this:
[0023] The feedback voltage controls the on and off of the internal switch of IC1.
[0024] When the switch is turned on, the power supply voltage is added to the output terminal through the inductor L1 to supply power to the load, and at the same time, energy is stored in the inductor L1.
[0025] When the switch is turned off, the energy stored in the inductor L1 continues to supply power to the load through the freewheeling diode D1.
[0026] The feedback voltage determine...
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