CN202334273U

CN202334273U - Controllable silicon constant current driving circuit based on planar transformer

Info

Publication number: CN202334273U
Application number: CN2011204048374U
Authority: CN
Inventors: 史丽萍; 胡泳军; 刘金虹; 赵井贵; 陈丽兵
Original assignee: XUZHOU SHANGRUO FUAN ELECTRICAL CO Ltd
Current assignee: Xuzhou Shangruo Fuan Electrical Co., Ltd.; Xuzhou Shangruo Technology Co., Ltd.
Priority date: 2011-10-22
Filing date: 2011-10-22
Publication date: 2012-07-11
Anticipated expiration: 2021-10-22

Abstract

The utility model discloses a controllable silicon constant current driving circuit based on a planar transformer, wherein two MOS (Metal Oxide Semiconductor) transistors of a push-pull circuit are controlled by an FPGA (Field Programmable Gate Array) internal logic control circuit to be in alternative conduction, and are further rectified by a synchronous rectifier circuit so as to output a constant current to drive the controllable silicon to be in conduction. Since the gate pole of the controllable silicon presents diode characteristics, the controllable silicon is prevented from being born when driven by the constant current instead of an over-high driving current. Different driving currents can be output by using the FPGA to control the reference voltage of a comparator. According to the controllable silicon constant current driving circuit provided by the utility model, a programmable constant driving current can be output, the volume is small, and the efficiency is up to 90%.

Description

Controllable silicon constant-current drive circuit based on flat surface transformer

Technical field

The drive circuit of silicon, controllable silicon are widely used in fields such as controlled rectification, active inversion, AC voltage adjusting, frequency converter, non-contact power switch.

Background technology

Thyristor is claimed controllable silicon again, is the abbreviation of silicon crystal thyratron.Be a kind of large power semiconductor device, come across the seventies.Its appearance makes semiconductor device expand to the forceful electric power field by the light current field.Utilize its rectification controllable characteristics to control and conversion large power supply easily.It has that little, in light weight, the withstand voltage height of volume, capacity are big, noiseless, long, capacity big (Mean Forward Current reaches kilo-ampere, forward is withstand voltage reaches thousands of volts) of life-span.Thyristor also has unilateral conduction as semiconductor diode, but its ON time is controlled (controllable silicon), is mainly used in aspects such as rectification, inversion, pressure regulation and switch.It has plain edition, two-way type and can the shutoff type etc.Advantages such as working service is simple, control sensitivity are so obtained using widely on commercial production.Can how can stablize and drive controllable silicon efficiently, be make to make good use of the silicon controlled key.

The advantage of flat surface transformer mainly concentrates on lower leakage inductance value and AC impedance.The gap that winding is asked means that more greatly leakage inductance is big more, also just produces higher energy loss.Flat surface transformer utilizes combining closely between Copper Foil and circuit board, makes in the gap of adjacent number of turn interlayer very little, so energy loss is also just very little.In planar transformer, its " winding " is to be made in the flat conductive leads on the printed circuit board or directly to moor with copper.Flat geometry has reduced the loss of skin effect when switching frequency is higher, just eddy current loss.Therefore, can utilize the surface conductance performance of copper conductor most effectively, efficient is more much higher than traditional transformer.In addition, the flat surface transformer volume is little, is convenient to reduce the overall volume of driver, need not artificial coiling, high conformity, and cost also is lower than the coiling transformer.

The utility model content

The utility model provides the controllable silicon drive circuit of a kind of employing based on flat surface transformer, and its advantage is to export constant current able to programme, and volume is little, and efficient can be up to 90%.

To achieve these goals; The utility model is realized through following technical scheme: this utility model comprises the internal logic control section of FPGA, based on the push-pull circuit part of flat surface transformer, and circuit of synchronous rectification part and constant current part able to programme; Two metal-oxide-semiconductors of the internal logic control circuit control push-pull circuit through FPGA take turns conducting; Pass through the circuit of synchronous rectification rectification again, export constant electric current, drive the controllable silicon conducting.Because the silicon controlled gate pole presents diode characteristic, use constant-current driving can avoid too high drive current that it is burnt.Reference voltage through FPGA control comparator just can be exported different drive currents.

Beneficial effect: this utility model can be exported constant drive current able to programme, and volume is little, and efficient can be up to 90%.

Description of drawings

Fig. 1 is based on the controllable silicon drive circuit topological diagram of flat surface transformer.

Fig. 2 is the inner logic control circuit topological diagram of FPGA.

Fig. 3 is based on the push-pull circuit topological diagram of flat surface transformer.

Fig. 4 is the circuit of synchronous rectification topological diagram.

Fig. 5 is a current-limiting circuit topological diagram able to programme.

Concrete implementation

See Fig. 1,, comprise the fpga logic control section, partly form based on the push-pull circuit of flat surface transformer part, synchronous rectification part, constant current able to programme based on the controllable silicon drive circuit of flat surface transformer.

See Fig. 2, FPGA isolates two complementary signals through inner trigger, drives two metal-oxide-semiconductors of push-pull circuit respectively, makes the complementary conducting of two metal-oxide-semiconductors.

See Fig. 3, two metal-oxide-semiconductors of push-pull circuit receive the complementary conducting of drive signal of FPGA.Through the flat surface transformer output voltage signal

See Fig. 4, through circuit of synchronous rectification, synchronous rectification is in order to reduce the tube voltage drop of diode, to make output obtain burning voltage and drive controllable silicon.

See Fig. 5, through current-limiting circuit, the electric current of restriction metal-oxide-semiconductor when overcurrent, is carried the shutoff drive signal through current-limiting circuit to FPGA, makes circuit be in off state, makes output be in constant current state, the reliability and stability that protection drives.

Claims

1. based on the controllable silicon constant-current drive circuit of flat surface transformer; This utility model comprises FPGA internal logic control section, based on the push-pull circuit part of flat surface transformer, and circuit of synchronous rectification part and constant current part able to programme; It is characterized in that: two metal-oxide-semiconductors of the internal logic control circuit control push-pull circuit through FPGA take turns conducting; Pass through the circuit of synchronous rectification rectification again, export constant electric current, drive the controllable silicon conducting.