CN2204470Y

CN2204470Y - Contravariant transforming industrial-frequency contravaring power-supply of d.c. high-frequency switch

Info

Publication number: CN2204470Y
Application number: CN 94241157
Authority: CN
Inventors: 徐景普
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-08-23
Filing date: 1994-08-23
Publication date: 1995-08-02
Anticipated expiration: 2004-08-23

Abstract

The utility model relates to a contravariant transforming industrial-frequency contravariant power supply of direct current high-frequency switch, composed of a contravariant voltage changing part, a rectifying energy storing part and an industrial-frequency contravariant part. Compared with the existing power supply, the utility model has the advantages that the volume and the weight of the utility model are greatly reduced, the conversion efficiency of electric energy and power are greatly improved, and the utility model can be directly used for starting high-power load; the utility model is an inverting power supply of popularization value.

Description

Contravariant transforming industrial-frequency contravaring power-supply of d.c. high-frequency switch

The utility model relates to a kind of direct current and becomes the inverter that exchanges.

Along with the development of society and the progress of science and technology, increasing non-power frequency power supply place needs the power frequency power supply.Locomotive driving chamber as railway need be that 220V power frequency electricity is supplied with air-conditioning and unit uses with the 110V dc inversion.In existing supply power mode, mainly adopt a kind of inverter of DC-AC transformation working method and the inversion unit of band alternating current generator.The former is that the direct current that will import directly is transformed into industrial-frequency alternating current through a series of electronic circuits, becoming needed electric pressure supply load through transformer then uses, but it has complex circuit, the shortcoming that used Industrial Frequency Transformer is bulky, make that power supply itself is overweight, bring many inconvenience to installation and maintenance.In addition because Industrial Frequency Transformer can not satisfy mutation current, incompatible band high power motor even load, particularly moment of actuating motor because the restriction of output current can cause starting resistor deficiency and wave distortion, cause the motor can't operate as normal.Owing to used Industrial Frequency Transformer, caused energy waste, efficient not high.Though the latter has promptly solved the starting power problem with the inversion unit of alternating current generator, owing to increased alternating current generator and a series of transmission device, cause system complex, the expense investment is high, and the big difficulty that waits of maintenance workload makes to use to be restricted.Therefore, it is very necessary developing a kind of novel inverter.

The utility model promptly is a kind of new DC high frequency switching inverter transformation, the power frequency inverter that designs at the problem of prior art existence, compare with existing inverter, having volume weight all significantly reduces, but the across-the-line starting heavy-duty motor, the characteristics that band heavy load power is big, efficient is high.

How the purpose of this utility model realizes if being described in detail in detail below.

The utility model adopts first high frequency switching inverter, direct current transformation energy storage, and the working method of the direct powering load of power frequency inversion is compared with existing inverter again, has removed the transformation link of Industrial Frequency Transformer, has increased the energy storage link.

Accompanying drawing is the utility model circuit structure diagram.

I is a high frequency switching inverter transformation part among the figure; II is the rectification energy storage section; III is a power frequency inversion part; G ₁～G ₄Be the high-power high-frequency switch pipe, B is a transformer, and C is a storage capacitor, and Vi is a direct-flow input end, and Vo is the power frequency output, and A is the controlling and driving part.

High frequency switching inverter transformation part I of the present utility model is by four high-power high-frequency switch pipe G ₁～G ₄, controlling and driving part A and transformer B form, the HF switch pipe is IGBT, is the input of field effect pipe, the high power valve of Darlington transistor output."+" utmost point of input Vi connects G ₁, G ₃The C utmost point, its "-" utmost point of Vi connects G ₂, G ₄The e utmost point, G ₁The e utmost point connects G ₂The C utmost point, G ₃The e utmost point connects G ₄The C utmost point, G ₁The e utmost point and G ₃The e utmost point respectively has an exit to connect transformer B input stage two ends; The controlling and driving part A is a square-wave generator, and this generator has four affair outputs, connects G respectively ₁, G ₂, G ₃, G ₄The b utmost point, square wave is added to G successively during work ₁G ₄And G ₂, G ₃The b utmost point, promptly control its conducting successively in twos.Transformer B secondary coil connects rectification energy storage section II.The transformer output directly connects rectification circuit, and this circuit is a prior art, as bridge rectifier.Rectification output two ends are connected with storage capacitor C, connect power frequency inverter circuit II thereafter, and this circuit is a prior art also, can be inverter circuits such as bridge-type, semibridge system.

During the utility model work, by Vi end input dc power, controlling and driving part A output square wave, wheel current control G ₁G ₄And G ₂, G ₃With conducting with end i.e. G ₁G ₄During conducting, G ₂, G ₃End, like this, obtain high-frequency alternating voltage, after the transformer transformation, rise to power frequency, through the rectification of energy storage rectifier circuit II, energy storage, become direct current again,, use for load after the power frequency inversion is a 220V power frequency electricity at the transformer input.

The utility model has thoroughly changed the working method of power frequency transformation after the power frequency inversion of existing inverter elder generation, taked first high frequency switching inverter, the direct current transformation energy storage, the working method of the direct powering load of power frequency inversion again, compare with existing inverter, removed Industrial Frequency Transformer transformation link, increased the energy storage link, improved the load capacity of motor load, with the situation of the same power output of existing inverter under, but the motor load that the utility model across-the-line starting and its power output adapt, and volume has only 20% of existing inverter, 70% of weight, efficient can reach more than 90%, improves more than 20% than existing power supply, more than electronic load power output can reach kilowatt, be widely used in the various occasions that need the power frequency inversion, have very big application value.

Claims

1, a kind of direct current high frequency switching inverter transformation power frequency inverter, it is characterized in that the utility model is by high frequency switching inverter transformation part I, rectification energy storage section II, power frequency inversion part III are connected in sequence, and high frequency switching inverter transformation part I is by four high-power high-frequency switch pipe G ₁～G ₄, controlling and driving part A and transformer B form, and "+" utmost point of direct current input Vi connects G ₁G ₂The C utmost point, its "-" utmost point of Vi connects G ₂G ₄The e utmost point, G ₁The e utmost point connects G ₂The C utmost point, G ₃The e utmost point connects G ₄The C utmost point, G ₁The e utmost point and G ₃The e utmost point respectively has an exit to connect transformer B input utmost point two ends; The controlling and driving part A is a square-wave generator, and this generator has four outputs to connect G respectively ₁, G ₂, G ₃, G ₄The b utmost point.Transformer B secondary coil connects the rectification circuit in the energy storage rectifier circuit II, and rectification circuit output two ends are connected with storage capacitor C, connect power frequency inverter circuit II thereafter, and rectification circuit and power frequency inverter circuit are prior art.