CN2054231U - Large power digital control apparatus for regulating voltage and changing crurent - Google Patents

Abstract

The utility model relates to a large power digital control device for regulating voltage and changing current, which comprises a pulse width regulation pulse generating circuit and a plurality of paralleled VMOS large power switch circuits and is used for lossless direct current regulation or direct current and alternating current regulation by changing directions in occasions when mechanical-electrical integration devices need large power. Because the VMOS pipe has the property of positive impedance and a positive temperature coefficient, the electric current can be distributed uniformly on each pipe, after a plurality of pipes are connected in parallel. Large control power and a large power coefficient can be obtained by connecting a plurality of pipes in parallel. The pulse width regulation pulse generating circuit can a drive circuit of a computer matched with a computer control interface, so that the purpose of direct digital control can be achieved.

Description

Large power digital control apparatus for regulating voltage and changing crurent

A kind of high-power numerical control pressure regulation and convertor assembly, it is used for the harmless of electromechanical integration equipment large-power occasions and directly regulates or direct current--exchange transformation by reciprocal direction.As if the field circuit of generating set, various dc drive circuits are used to drive numerical control inversion circuit such as blower fan, compressor, industrial pump, the power supply conversion of plating, electric machining, DC Brushless Motor and the power conversion of various electric induction furnaces.

The harmless adjusting with convertor assembly of present direct current adopts thyristor as the switching circuit element more.Because the restriction of silicon controlled turn-off criterion needs the complicated breaking circuit of a cover, it is unreliable to turn-off.Now used advanced DC adjustment and convertor assembly are to form with widened pulse generation circuit and high-power darlington pipe.Because the manufacturing difficulty of Darlington transistor, cost is very high, and power is not very big, and maximum now also has only 300 kilowatts, and frequency response is lower.

The purpose of this utility model is invention a kind of high efficiency, low cost, high-power numerical control pressure regulation and convertor assembly (can carry out DC adjustment and direct current--ac converter) simple in structure.

The utility model is made up of widened pulse generation circuit (1) that constitutes solid-state module and high-power switching circuit (2), it is characterized in that: high-power switching circuit (2) is made up of the VMOS high-power FET of some parallel connections, the source of all VMOS pipes is parallel to source plates (3), and all leakages also are parallel to drain electrode plate (4), source plates (3) is held in the VMOS pipe clamp middle with drain electrode plate (4) and good thermo-contact is arranged, a resistance R 1 in parallel respectively between the source of each VMOS pipe and the grid, each VMOS pipe grid links by connect respectively a resistance R 2 and control circuit simultaneously.

Accompanying drawing 1 is an electrical schematic diagram of the present utility model.

Accompanying drawing 2 is a structure chart of the present utility model.

Use the VMOS pipe to do high power switch in the utility model, because the conducting of VMOS pipe is decided by its grid potential fully with shutoff, and the response speed height, therefore conducting is easy with shutoff, the switching speed height, need not resemble increases special breaking circuit the controllable silicon, turn-offs reliability and also improves greatly.Simultaneously, the output impedance of VMOS pipe is positive resistance characteristic and has positive temperature coefficient, during therefore with the parallel connection of plurality of V metal-oxide-semiconductor, each pipe is because positive resistance characteristic and negative feedback that positive temperature coefficient rose, electric current is evenly distributed on each pipe, can obtains desired big power controlling by the parallel connection of several VMOS pipes like this.Because the input impedance of VMOS pipe is very high, when therefore both having used hundreds of pipes in parallel, also can promote with a simple drive circuit.VMOS pipe by the different numbers of parallel connection can obtain different specified power controlling easily, forms a series.Resistance R 1 is a bleeder resistance, makes gate breakdown when being used to prevent electrostatic interaction.Resistance R 2 is used to make each Guan Nenggeng evenly to work for all pressing and protective resistance, simultaneously can be when indivedual tube grids puncture, and the protection whole system can also operate as normal.The cost of plurality of V metal-oxide-semiconductor is than much lower with the Darlington transistor of constant power, and can combination in any, obtains bigger power controlling and power series.

Accompanying drawing 2 is VMOS pipe fixation structure figure.VMOS pipe distributes equably to be fixed in and doublely does the source plates (3) of heating panel and drain between the plate (4).Fixedly available silicon is gluing connects; Also can with its residence thermal conductivity good and the insulation material make wherein a pole plate and another electrode plate insulation.Two-plate all has good thermo-contact in the both sides of VMOS pipe.Because two-plate is a radiating surface all, all dispelled the heat in VMOS pipe two sides, improved radiating condition, it is less that black box is taken up room.Because a whole pass circuit of opening is made a solid-state module, and reliability improves, and without on-site maintenance, can adapt to various environment.

The utility model in the middle of with two-plate the VMOS pipe clamp being held in simultaneously, carries out the two sides heat radiation owing to adopt the plurality of V metal-oxide-semiconductor to compose in parallel high power switch, therefore has compact conformation reasonable, helps heat radiation, and cost is low, efficient height, frequency response advantages of higher.

Switching circuit in the utility model (2) can be divided into 4 groups, and as shown in Figure 3, symmetry is formed a bridge circuit, is used for direct current--ac converter.Also can form a multiple bridge with 6 groups of switching circuits (2), be three-phase alternating current with dc inversion, as shown in Figure 4.In above-mentioned bridge circuit, should make the drive circuit interlocking of two groups of switches up and down, guarantee not conducting simultaneously.For making widened pulse generation circuit (1) standardization more, should add a photoelectric isolating circuit at the output of widened pulse generation circuit (1), to isolate the high pressure of controlled terminal.

Widened pulse generation circuit (1) in the utility model can be a multivibrator simply.Multivibrator can be made up of resolution element as shown in Figure 5, also can form with a JD flip-flop integrated circuit piece adjunction capacitance-resistance feedback.Widened pulse generation circuit (1) also can be finished with computer.Can store multiple Wave data in advance, by a series of different pulse trains simulation different wave.Can also many-sided change output control, can feed back automatic control by the measuring-signal of accepting required controlled quentity controlled variable, thereby reach the purpose of direct numerical control.Widened pulse generation circuit of the present utility model (1) also can only keep the drive circuit that directly mates with standard computer control interface, can control a plurality of equipment by a station symbol semicomputer, thus a basic device of formation electromechanical integration.Thereby the utility model can be used as a kind of basic means of electromechanical integration.

VMOS pipe in the utility model can be used MTH7N50, MTH8N55 and MTH15N50 etc., can be by several, tens even hundreds of individual switching circuit (2) that composes in parallel.Bleeder resistance can be 1 megohm, and its purpose is to guarantee that as bleeder resistance grid is not punctured by electrostatic potential.Evenly resistance R 2 is generally got about 10 kilohms, can be bigger, and to 100 kilohms, it plays and all presses and protective effect.Source plates (3) and drain electrode plate (4) can be used aluminium sheet, also can use copper coin, should be heat conduction, conduction material well, and the packing material that VMOS manages available insulation is filled between the two-plate.

Claims (2)

1, a kind of high-power numerical control pressure regulation and convertor assembly, it is made up of widened pulse generation circuit (1) that constitutes solid-state module and high-power switching circuit (2), it is characterized in that: high-power switching circuit (2) is made up of the VMOS high-power FET of some parallel connections, the source of all VMOS pipes is parallel to source plates (3), and all leakages also are parallel to drain electrode plate (4), source plates (3) is held in the VMOS pipe clamp middle with drain electrode plate (4) and good thermo-contact is arranged, a resistance R 1 in parallel respectively between the source of each VMOS pipe and the grid, each VMOS pipe grid links by connect respectively a resistance R 2 and control circuit simultaneously.

2, high-power numerical control pressure regulation as claimed in claim 1 and convertor assembly is characterized in that: the inversion bridge circuit of the single-phase or three-phase alternating current of the generation that high-power switching circuit (2) is made up of 4 groups or 6 groups of VMOS pipe.

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