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Device and method for converting voltage using switch mode

A technology of converting voltage and switching mode, which is applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve problems such as annoying, increase circuit complexity, increase cost, etc. waste, reduce electromagnetic interference, and reduce the effect of turns ratio

Active Publication Date: 2007-12-19
SHENZHEN TCL NEW-TECH CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] It is pointed out here that there are several shortcomings in this solution: on the one hand, it will increase the cost, excluding its peripheral components, and the price of only one component (IC) is at least about 1 yuan; on the other hand, it will also increase the complexity of the circuit, At the same time, it brings annoying interference, which affects the reliability of the whole machine, and it will increase the cost to overcome the interference

Method used

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  • Device and method for converting voltage using switch mode

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Embodiment Construction

[0024] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] In flat panel color TVs, a switching step-down circuit is generally used to supply power to the digital circuit part, and Figure 1 is a typical circuit of this 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.

[0026] It works like this:

[0027] The feedback voltage controls the on and off of the internal switch of IC1.

[0028] 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.

[0029] 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.

[0030] The feedback voltage det...

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Abstract

This invention relates to a device and a method for converting voltages by a switch mode, in which, the device includes a switch supply, an inductor, diodes and capacitors, and the inductor includes a primary coil and a secondary coil coupled to each other, both ends of the secondary coil are parallel to two branches with two diodes serial to capacitors to commutate and filter the positive and negative induced voltages to form a DC supply, which can be laminated to generate a voltage meeting the requirement.

Description

technical field [0001] The invention belongs to a power conversion device and method, specifically, a device and method for obtaining another auxiliary power source through conversion based on a switching power supply. Background technique: [0002] AC and DC power supplies are used in electronic equipment, especially for equipment that uses integrated circuits and also has display functions. It is specially designed to provide tuning voltage for voltage synthesis tuner (high frequency head), and has special requirements: small power, accurate and stable voltage. Because of its small power, it will not add any burden to the existing power supply, so it is often changed by utilizing the existing power supply. In the past, in the era of CRT color TV, it was obtained by stepping down the 130V high voltage in the TV through a resistor. In flat panel TVs, such as LCD color TVs, there is no 130V high voltage, only 12V low voltage. At this time, to obtain 33V voltage, it is also ...

Claims

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Application Information

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IPC IPC(8): H02M7/155
Inventor 王坚
Owner SHENZHEN TCL NEW-TECH CO LTD
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