CN101127493A - AC/DC PWM conversion circuit and its control device - Google Patents
AC/DC PWM conversion circuit and its control device Download PDFInfo
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- CN101127493A CN101127493A CNA2007100171753A CN200710017175A CN101127493A CN 101127493 A CN101127493 A CN 101127493A CN A2007100171753 A CNA2007100171753 A CN A2007100171753A CN 200710017175 A CN200710017175 A CN 200710017175A CN 101127493 A CN101127493 A CN 101127493A
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Abstract
The utility model relates to an AC/DC PWM inversion circuit and a control device. The inversion circuit comprises an input reactor circuit, a level circuit, a filtering absorber circuit and a direct current bus connected in order. The control device is that: an input power supply is connected with a phase voltage and current sampling circuit. The direct current bus is connected with its voltage sampler. The phase voltage and current sampling circuit and the direct current bus voltage sampler are connected with a voltage and current regulator, which is connected with a PWM generating circuit linking with the level circuit. The utility model makes use of boosting transformation concept in the DC/DC inversion, to take the input high order harmonic current as the feedback parameter for current closed-loop control. So the shortage of indirect current control method can be effectively solved. The device with stable output positive and negative bus-bar voltages, high net side power factor and low current harmonics, can meet the requirement in the national standards.
Description
(1) technical field
The present invention relates to the modern power electronic converter technique of AC/DC PWM, specially refer to a kind of AC/DC PWM translation circuit and control device thereof.
(2) background technology
AC/DC PWM converter technique mainly contains three kinds of methods in the prior art, and the one, diode is not controlled rectification, and the 2nd, Thyristor Controlled rectification, the 3rd, PWM controlled rectification.Preceding two kinds of rectification transformating circuits and control method make current harmonics THD bigger, and be bigger to Disturbance in Power Net, do not allow to use in some accurate occasions.Given this, solve the problems referred to above with controlled AC/DC translation circuit of PWM and control thereof.
(3) summary of the invention
The present invention is in order to overcome the deficiency of above technology, a kind of AC/DC PWM translation circuit and control device thereof are provided, solution input harmonics height, overall efficiency is low, has reliable operation, function admirable, characteristics such as net side power factor height belong to a kind of " green " Technics of Power Electronic Conversion technology of the world today.
The present invention realizes by following measure:
AC/DC PWM translation circuit of the present invention, be to connect to form successively by input reactance device circuit, level circuit, filtering absorption circuit, dc bus, level circuit and filtering absorb circuit and are connected between the dc bus, three outputs of input reactance circuit connect three inputs of level circuit respectively, and the output of level circuit is connected respectively on the input of filtering absorption circuit; Described level circuit is made up of full control device, diode and catching diode, full control device is connected mutually, diode is connected on the two ends of full control device and is connected on the dc bus, and clamping diode is connected in parallel on the tie point and the tie point between the full control device between the diode.
The AC/DC PWM translation circuit of the invention described above, described level circuit are two level circuits, tri-level circuit, five level circuits, seven level circuits or higher odd number multi-level circuit.
AC/DC PWM translation circuit of the present invention, it is to be composed in series by a plurality of filter capacitors that described filtering absorbs circuit.
AC/DC PWM translation circuit device of the present invention, reciprocity quantity power electric component for the close positive and negative bus both sides of odd number multi-level circuit topology is a diode, this diode is fast the recovery, full control device in the circuit can be IGBT, MOSFET, IGCT etc., also can replace fast recovery diode with these devices simultaneously.
The control device of AC/DC PWM translation circuit of the present invention is to be connected successively by input power supply, input reactance device circuit, level circuit, filtering absorption circuit, dc bus; The input power supply connects the phase-voltage phase-current sample circuit, dc bus connects the DC bus-bar voltage sampler, the phase-voltage phase-current sample circuit all is connected with voltage and current regulator with the DC bus-bar voltage sampler, voltage and current regulator connects the PWM generative circuit, and the PWM generative circuit is connected on the level circuit.
Conventional PWM rectification circuit topology is that two level or many level all are made up of full control device.Level circuit of the present invention is that the controlled power device and the fast recovery diode of series connection formed, and the controlled power device reduces at double.When controlling with controllable devices IGBT entirely in the AC/DC PWM translation circuit of the present invention, also just control the antiparallel diode of device inside entirely with close positive and negative bus end IGBT.
AC/DC PWM translation circuit of the present invention and control device are different from conventional PWM rectification control method, and circuit topological structure is simple, the ingenious and easy realization of control algolithm.Utilize the boost conversion thinking in the DC/DC conversion, the input current higher harmonic current has been carried out current closed-loop control as feedback quantity, can effectively solve the deficiency of indirect current control method.The output positive and negative busbar voltage of this device is stable, net side power factor height, and current harmonics is low and can satisfy the GB requirement.
(4) description of drawings
Fig. 1 is a kind of main circuit diagram of simple AC/DC PWM translation circuit
Among the figure: 2, input reactance circuit 3, level circuit 9, filtering absorption circuit L are inductance, Va3～Va6, Vb3～Vb6, Vc3～Vc6 are controlled device entirely, Va1, Va2, Va7, Va8, Vb1, Vb2, Vb7, Vb8, Vc1, Vc2, Vc7, Vc8 are diodes, Va9～Va20, Vb9～Vb20, Vc9～Vc20 are clamping diodes, and C1～C4 is a filter capacitor.
Fig. 2 is the principle calcspar of AC/DC PWM translation circuit control device
Among the figure: 1, input power supply 2, input reactance device circuit 3, level circuit 4, dc bus 5, PWM generative circuit 6, phase-voltage phase-current sample circuit 7, voltage and current regulator 8, DC bus-bar voltage sampler.
(5) embodiment
Below in conjunction with the drawings and specific embodiments the present invention is made specific description.
Embodiment 1:
The main circuit of AC/DC PWM translation circuit of the present invention is the schematic diagram of example with five level, as shown in Figure 1.
Its circuit structure form is by input reactance circuit 2, level circuit 3, and filtering absorbs circuit 9 and forms.Annexation between them as shown in Figure 1.
The rectification of three-phase voltage, filtering topology is identical with common three phase rectifier, filtering topology.Different is, the upper and lower bridge arm of rectifier bridge by original whole be to control device entirely to change into by full control device and fast recovery diode is in series and catching diode is formed level circuit, and between the positive and negative busbar of power supply, inserted the absorption filter circuit that is composed in series by capacitor C 1～C4.
The main circuit annexation of AC/DC PWM translation circuit of the present invention is three inputs that three outputs of input reactance circuit 2 connect level circuit 3 respectively, and 5 outputs of level circuit 3 are connected respectively in 5 inputs of filtering absorption circuit 9.
Wherein the concrete annexation of level circuit 2 is as follows: control the end that device Va3, Va4, Va5, Va6 be in series entirely and connect diode in series Va2, Va1, be connected to positive bus-bar then, the other end connects diode in series Va7, Va8 and connects negative busbar.Be connected with the end that 4 clamping diode Va9, the Va10 that connect, Va11, Va12 meet power device Va5 then at diode Va1 with the tie point of Va2.The tie point that the tie point that the tie point of Va9 and Va10 meets Vb9 and Vb10 meets Vc9 and Vc10 is again received the tie point of filter capacitor C1 and C2 then, and by the positive and negative busbar voltage of two terminations of filter capacitor, Vb, Vc are identical with the method for attachment of Va.
Other multi-level circuit is as three level, seven level, the annexation of approximate five level circuits of the annexation of nine level circuits, just the number respective change on total device.
Embodiment 2:
As shown in Figure 2, be a kind of calcspar of simple AC/DC PWM translation circuit control device.
Its control principle is: the three phase mains input between " input power supply " 1 and " level circuit " 3 is connected by " input reactance device circuit " 2, its objective is the filtering of importing power supply, reduce to import the harmonic component of power supply, simultaneously, insert " phase-voltage phase-current sample circuit " 6 in the input power supply, to three-phase input power source voltage, sample acquisitions is carried out in the variation of electric current, sampled signal is sent into " voltage and current regulator " 7, take a sample from " dc bus " 4 simultaneously by " DC bus-bar voltage sampler " 8, also send into " voltage and current regulator " 7 then, its output signal is sent into " PWM generative circuit " 5, thus the operating state of control PWM ripple." level circuit " 3 finished multi-level rectifying work under the control of " PWM generative circuit " 5.So just form a kind of simple AC/DC PWM rectifier control circuit that utilizes the high order harmonic component of phase current as feedback quantity.
Control principle is the boost conversion thinking that has utilized in the DC/DC translation circuit, and the higher harmonic current of input phase current is carried out current closed-loop control as feedback quantity.
Claims (5)
1. AC/DC PWM translation circuit, it is characterized in that: be to connect to form successively by input reactance device circuit (2), level circuit (3), filtering absorption circuit (9), dc bus, level circuit and filtering absorb circuit and are connected between the dc bus, three outputs of input reactance circuit (2) connect three inputs of level circuit (3) respectively, and the output of level circuit (3) is connected respectively on the input of filtering absorption circuit (9); Described level circuit is made up of full control device, diode and catching diode, full control device is connected mutually, diode is connected on the two ends of full control device and is connected on the dc bus, and clamping diode is connected in parallel on the tie point and the tie point between the full control device between the diode.
2. AC/DC PWM translation circuit according to claim 1 is characterized in that: described level circuit is two level circuits, tri-level circuit, five level circuits, seven level circuits or higher odd number multi-level circuit.
3. AC/DC PWM translation circuit according to claim 1 is characterized in that: it is to be composed in series by filter capacitor that described filtering absorbs circuit.
4. AC/DC PWM translation circuit according to claim 1 is characterized in that: described full control device is IGBT, MOSFET or IGCT, and described diode and clamp diode are fast the recoveries.
5. the control device of the described AC/DC PWM of claim 1 translation circuit is characterized in that: be to be connected successively by input power supply (1), input reactance device circuit (2), level circuit (3), filtering absorption circuit (9), dc bus (4); Input power supply (1) connects phase-voltage phase-current sample circuit (6), dc bus (4) connects DC bus-bar voltage sampler (8), phase-voltage phase-current sample circuit (6) all is connected with voltage and current regulator (7) with DC bus-bar voltage sampler (8), voltage and current regulator (7) connects PWM generative circuit (5), and PWM generative circuit (5) is connected on the level circuit (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100171753A CN101127493A (en) | 2007-09-29 | 2007-09-29 | AC/DC PWM conversion circuit and its control device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100171753A CN101127493A (en) | 2007-09-29 | 2007-09-29 | AC/DC PWM conversion circuit and its control device |
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| Publication Number | Publication Date |
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| CN101127493A true CN101127493A (en) | 2008-02-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100171753A Pending CN101127493A (en) | 2007-09-29 | 2007-09-29 | AC/DC PWM conversion circuit and its control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055359A (en) * | 2009-11-06 | 2011-05-11 | Mgeups系统公司 | Multi level converter having at least five DC voltage levels and ups comprising the same |
-
2007
- 2007-09-29 CN CNA2007100171753A patent/CN101127493A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102055359A (en) * | 2009-11-06 | 2011-05-11 | Mgeups系统公司 | Multi level converter having at least five DC voltage levels and ups comprising the same |
| CN102055359B (en) * | 2009-11-06 | 2015-05-13 | Mgeups系统公司 | Multi level converter having at least five DC voltage levels and UPS comprising the same |
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