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Direct current(DC)-to-direct current conversion system

A DC to DC conversion system technology, applied in the field of DC to DC conversion systems, can solve problems such as user troubles

Inactive Publication Date: 2012-11-07
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010]However, in the known DC-DC conversion system, at the moment when the burst signal Burst action period begins, the inductor current IL increases sharply, so the iron core and coil in the inductor L will Colliding with each other to generate noise (audible noise) causing confusion for users

Method used

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  • Direct current(DC)-to-direct current conversion system
  • Direct current(DC)-to-direct current conversion system
  • Direct current(DC)-to-direct current conversion system

Examples

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Embodiment Construction

[0027] Please refer to image 3 , which is a schematic diagram of the DC-to-DC conversion system of the present invention. The DC-to-DC conversion system is applied to the LED backlight module of the display panel, which includes: a PWM unit 210 , a power stage circuit 220 , a load circuit 230 , and a control unit 250 . Wherein, the PWM unit 210 includes a PWM logic circuit 212 and a comparator 214; the power stage circuit 220 includes an inductor L, a rectifier diode D, a power transistor M1, and a first resistor R1; the load circuit 230 includes multiple A serial connection of light-emitting diodes LED1, LED2, and LED3 is connected between the output terminal OUT of the power stage circuit 220 and the ground terminal GND; the control unit 250 includes: an inverter 252, a switching transistor M2, a capacitor C, and a The second resistor R2.

[0028] Depend on image 3 It can be seen that the inductor L of the power stage circuit 220 is connected between the input voltage V...

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Abstract

The invention discloses a DC-to-DC conversion system, which comprises that: a pulsewidth modulation unit receives a detonator signal and has an actuating period and a non-actuating period, wherein in the actuating period, the pulsewidth modulation unit outputs a gate control signal and compares a compensation signal with a sense signal to control the duty ratio of the gate control signal; a power-level circuit receives an input voltage, and in the actuating period, the power-level circuit regulates an output signal and generates the corresponding sense signal according to the duty ratio of the grate control signal; a load circuit receives an output current; and a control unit receives the compensation signal, wherein the compensation signal is reduced in the non-actuating period of a detonator signal, and the duty ratio of the grate control signal is reduced by using the reduced compensation signal in the initial period of the actuating period of the detonator signal.

Description

technical field [0001] The present invention relates to a direct current to direct current conversion system, and in particular to a direct current to direct current conversion system of a pulse width modulation (Pulse width modulation, PWM) circuit. Background technique [0002] Please refer to figure 1 , which is a schematic diagram of a known DC-to-DC conversion system. The DC-to-DC conversion system is applied to a Light Emitting Diode (LED) backlight module of a display panel, which includes: a PWM unit 110 , a power stage circuit 120 , and a load circuit 130 . Among them, the PWM unit 110 includes a PWM logic circuit 112 and a comparator 114; the power stage circuit 120 includes an inductor L, a rectifier diode D, a power transistor M1, and a resistor R; the load circuit 130 includes a plurality of series The connected LEDs LED1 , LED2 , LED3 are connected between the output terminal OUT of the power stage circuit 120 and the ground terminal GND. [0003] Depend on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
Inventor 吴昶辉陈世轩李建辉杨智涵熊国佑
Owner AU OPTRONICS CORP
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