CN202918201U

CN202918201U - Transverter capable of realizing input current equalization of transformer

Info

Publication number: CN202918201U
Application number: CN 201220434922
Authority: CN
Inventors: 肖智宽; 于晓晖; 胡正东
Original assignee: CHENGDU COLDPLAY NETWORK TECHNOLOGY CO LTD
Current assignee: CHENGDU COLDPLAY NETWORK TECHNOLOGY CO LTD
Priority date: 2012-08-30
Filing date: 2012-08-30
Publication date: 2013-05-01
Anticipated expiration: 2022-08-30

Abstract

Disclosed in the utility model is a transverter capable of realizing input current equalization of a transformer. The transverter is composed of a pulse width modulation circuit, a filter circuit, a first field effect transistor, a second field effect transistor, a first resistor, a second resistor, a transformer, a first tube and a second tube. According to the utility model, the first resistor and the second resistor are respectively connected in series between a first winding and a second winding of the transformer and a power input terminal; and a current equalization circuit is arranged between the transformer and the power input terminal. When element parameters of an input current loop of the transformer are not matched, the current equalization circuit can be adjusted to match all the element parameters of the loop that the current balancing circuit is located, so that all input impedances of the transformer are consistent and thus the input currents are equalized. Therefore, the potential quality hazard of the inverting circuit can be effectively reduced and the reliability can be enhanced.

Description

A kind of converter that can make the input current equilibrium of transformer

Technical field

The utility model relates to a kind of converter, relates in particular to a kind of converter that can make the input current equilibrium of transformer.

Background technology

Liquid crystal indicator because of have low diathermaneity, the characteristics such as volume is compact and power consumption is low, be widely used in the fields such as mobile phone, personal digital assistant, notebook computer, PC and TV.Liquid crystal indicator is not had a characteristics of luminescence because of its liquid crystal itself, so need external light source to show required light for it provides, liquid crystal indicator generally adopts cold cathode fluorescent lamp as its external light source at present, and transformer output current of the prior art and unbalanced needs a converter circuit to provide its required operating voltage for fluorescent tube.

Summary of the invention

The purpose of this utility model provides a kind of converter that can make the transformer imput current equilibrium of liquid crystal indicator with regard to being in order to address the above problem.

The utility model is achieved through the following technical solutions above-mentioned purpose:

The utility model comprises pulse-width modulation circuit, filter circuit, the first field effect transistor, the second field effect transistor, the first resistance, the second resistance, transformer, the first fluorescent tube and the second fluorescent tube, the first output of described pulse-width modulation circuit is connected with the grid of described the first field effect transistor, the second output of described pulse-width modulation circuit is connected with the grid of described the second field effect transistor, the drain electrode of described the first field effect transistor is connected with the first end of the first winding of described transformer, the drain electrode of described the second field effect transistor is connected with the first end of the second winding of described transformer, the second end of the first winding of described transformer is connected with the first end of described the first resistance, the second end of the second winding of described transformer is connected with the first end of described the second resistance, the second end while of described the first resistance and the second end of described the second resistance, the positive source input be connected the input of filter circuit and connect, the first end of the tertiary winding of described transformer is connected with the first end of described the first fluorescent tube, the second end of the tertiary winding of described transformer is connected with the first end of described the second fluorescent tube, the second end while and the described power cathode of described the first fluorescent tube, the second end of described the second fluorescent tube, the negative input of described filter circuit, the source electrode of described the first field effect transistor be connected the source electrode of the second field effect transistor and connect; This pulse-width modulation circuit send pulse signal to this switching circuit with the unlatching of controlling this switching circuit internal switch element or close, this power input provides operating current via this current equalization circuit for this transformer, and this transformer controlled by this switching circuit so that this transformer work.

The beneficial effects of the utility model are:

The utility model adds current equalization circuit between this transformer and this power input, when the component parameters in this transformer imput current loop does not mate, this current equalization circuit of capable of regulating, each component parameters that cooperates its loop, place, make each input impedance of this transformer consistent, so balanced its input current can effectively reduce the quality hidden danger of this converter circuit, improves its reliability.

Description of drawings

Accompanying drawing is circuit structure schematic diagram of the present utility model.

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing:

As shown in drawings: the utility model comprises pulse-width modulation circuit MK, filter circuit LB, the first field effect transistor TR1, the second field effect transistor TR2, the first resistance R 1, the second resistance R 2, transformer T, the first fluorescent tube E1 and the second fluorescent tube E2, the first output of pulse-width modulation circuit MK is connected with the grid of the first field effect transistor TR1, the second output of pulse-width modulation circuit MK is connected with the grid of the second field effect transistor TR2, the drain electrode of the first field effect transistor TR1 is connected with the first end of the first winding of transformer T, the drain electrode of the second field effect transistor TR2 is connected with the first end of the second winding of transformer T, the second end of the first winding of transformer T is connected with the first end of the first resistance R 1, the second end of the second winding of transformer T is connected with the first end of the second resistance R 2, the second end while of the first resistance R 1 and the second end of the second resistance R 2, the positive source input is connected input and is connected with filter circuit LB, the first end of the tertiary winding of transformer T is connected with the first end of the first fluorescent tube E1, the second end of the tertiary winding of transformer T is connected with the first end of the second fluorescent tube E2, the second end while and the power cathode of the first fluorescent tube E1, the second end of the second fluorescent tube E2, the negative input of filter circuit LB, the source electrode of the first field effect transistor TR1 be connected the source electrode of field effect transistor TR2 and connect.This pulse-width modulation circuit MK send pulse signal to this switching circuit with the unlatching of controlling this switching circuit internal switch element or close, this power input provides operating current via this current equalization circuit for this transformer T, and this transformer T controlled by this switching circuit so that this transformer work.

As shown in drawings: when this pulse-width modulation circuit MK exports a pulse signal to the grid of this first field effect transistor TR1 by this first output, this first field effect transistor TR1 opens, this second field effect transistor TR2 closes, electric current is from power input, enter the end of the first winding of transformer T through this first resistance R 1 to its other end, consist of a loop through draining to source electrode of this first field effect transistor TR1 again.At this moment, the sense of current that flows through the first winding of transformer T is upper just bearing down, the inductive current direction of the tertiary winding of transformer T also is upper just bearing down, electric current from an end of the tertiary winding of transformer T through this second fluorescent tube E2 to negative pole, consist of a loop through this first fluorescent tube E1 to the other end of the tertiary winding of transformer T by negative pole again.When the second output of this pulse-width modulation circuit MK is exported a pulse signal to the grid of this second field effect transistor TR2, this second field effect transistor TR2 opens, this first field effect transistor TR1 closes, electric current is from this power input, enter the end of the second winding of transformer T through this second resistance R 2 to its other end, consist of a loop through draining to source electrode of this second field effect transistor TR2 again.At this moment, the sense of current that flows through the tertiary winding of transformer T is upper just lower negative, the inductive current direction of the tertiary winding of this transformer T also is upper just lower negative, electric current from an end of the tertiary winding of transformer T through this first fluorescent tube E1 to ground, consist of a loop through this second fluorescent tube E2 to the other end of the tertiary winding of transformer T by ground again.

The utility model seals in respectively the first resistance R 1 and the second resistance R 2 between first, second winding of transformer T and power input, when the component parameters of this transformer T input current loop does not mate, the resistance of this first resistance R 1 of capable of regulating and the second resistance R 2, each component parameters that cooperates its loop, place, make the input impedance of first, second winding of transformer T consistent, so balanced its input current.

Claims

1. converter that can make the input current equilibrium of transformer, it is characterized in that: comprise pulse-width modulation circuit, filter circuit, the first field effect transistor, the second field effect transistor, the first resistance, the second resistance, transformer, the first fluorescent tube and the second fluorescent tube, the first output of described pulse-width modulation circuit is connected with the grid of described the first field effect transistor, the second output of described pulse-width modulation circuit is connected with the grid of described the second field effect transistor, the drain electrode of described the first field effect transistor is connected with the first end of the first winding of described transformer, the drain electrode of described the second field effect transistor is connected with the first end of the second winding of described transformer, the second end of the first winding of described transformer is connected with the first end of described the first resistance, the second end of the second winding of described transformer is connected with the first end of described the second resistance, the second end while of described the first resistance and the second end of described the second resistance, the positive source input be connected the input of filter circuit and connect, the first end of the tertiary winding of described transformer is connected with the first end of described the first fluorescent tube, the second end of the tertiary winding of described transformer is connected with the first end of described the second fluorescent tube, the second end while and the described power cathode of described the first fluorescent tube, the second end of described the second fluorescent tube, the negative input of described filter circuit, the source electrode of described the first field effect transistor be connected the source electrode of the second field effect transistor and connect.