CN100561837C - A kind of three-phase rectifying flat wave circuit - Google Patents
A kind of three-phase rectifying flat wave circuit Download PDFInfo
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- CN100561837C CN100561837C CNB2007101250413A CN200710125041A CN100561837C CN 100561837 C CN100561837 C CN 100561837C CN B2007101250413 A CNB2007101250413 A CN B2007101250413A CN 200710125041 A CN200710125041 A CN 200710125041A CN 100561837 C CN100561837 C CN 100561837C
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Abstract
The invention discloses a kind of three-phase rectifying flat wave circuit, comprise first three-phase full-bridge rectifier, buffer circuit and at least one compensating circuit; The input coupling of the input of described buffer circuit and first three-phase full-bridge rectifier, the output of described buffer circuit and the input of described compensating circuit coupling; Described first three-phase full-bridge rectifier output and compensating circuit output are coupled; Synthetic back of the output of all compensating circuits and correction waveform equivalence, described correction waveform is that the voltage that described first three-phase full-bridge rectifier is exported be multiply by-1, the amplitude of adding the first three-phase full-bridge rectifier input voltage obtains.The present invention has improved the voltage waveform of output, has eliminated harmonic wave, cost is low.
Description
Technical field
The present invention relates to a kind of three-phase rectifying flat wave circuit.
Background technology
The direct voltage of three phase full bridge six pulse wave rectifier circuit output is a pulsating dc voltage, because of pulsation rate excessive, valley point voltage is 86.6% of a crest voltage, so can not directly utilize, existing three phase full bridge six pulse wave rectifier circuit generally all pass through filter capacitor in parallel, so that pulsating dc voltage is level and smooth.When only the pulsating dc voltage arteries and veins after rectification is higher than filter capacitor voltage, pulsating dc voltage could charge to filter capacitor, this electric current is the very high pulse current of peak value, can cause the distortion of alternating current, and existing three phase full bridge six pulse wave rectifier circuit can produce a large amount of input harmonics.In high-power circuit, by using suitably harmonic carcellation of 12 pulse waves, 16 pulse waves, 18 pulse waves, 24 pulse waves, 30 pulse waves and above pulse wave rectifier circuit.The realization of the circuit of these many pulse numbers will be isolated input transformer by means of phase shift, and phase shift to isolate input transformer be the same with the bearing power that will drive, this powerful phase shift isolation input transformer complex structure, price height, running wastage are big.
Summary of the invention
The present invention is exactly in order to overcome above deficiency, to have proposed a kind of three-phase rectifying flat wave circuit, and its output voltage is level and smooth and need not to use powerful phase shift to isolate input transformer, and then reduces cost.
Technical problem of the present invention is solved by following technical scheme: a kind of three-phase rectifying flat wave circuit, comprise first three-phase full-bridge rectifier, buffer circuit and at least two compensating circuits, series connection mutually between each compensating circuit, the input coupling of the input of described buffer circuit and first three-phase full-bridge rectifier, the output of described buffer circuit and the input of described compensating circuit coupling; Described first three-phase full-bridge rectifier output and compensating circuit output are in series; Synthetic back of the output of all compensating circuits and correction waveform equivalence, described correction waveform is that the voltage that described first three-phase full-bridge rectifier is exported be multiply by-1, the amplitude of adding the first three-phase full-bridge rectifier input voltage obtains, described compensating circuit comprises chopper, bypass circuit and second three-phase full-bridge rectifier, and described second three-phase full-bridge rectifier is with in parallel with described bypass circuit again after described chopper is connected; During described chopper conducting, the output voltage of the output voltage of second three-phase full-bridge rectifier and first three-phase full-bridge rectifier is applied output, and when described chopper cut out, the output of first three-phase full-bridge rectifier was exported by bypass circuit; Described buffer circuit is the voltage-dropping type isolating transformer.
The former edge joint method of described voltage-dropping type isolating transformer is star-like, and the secondary connection is a triangular form, and the former edge joint method of perhaps described voltage-dropping type isolating transformer is a triangular form, and the secondary connection is star-like.
Described chopper is the full-controlled switch device, and described bypass circuit is a diode.
Described compensating circuit is two, and the output line voltage of described voltage-dropping type isolating transformer is 6.7% of an input line voltage.
Described compensating circuit is three, and the output line voltage of described voltage-dropping type isolating transformer is 4.47% of an input line voltage.
A kind of three-phase rectifying flat wave circuit comprises first three-phase full-bridge rectifier, also comprises buffer circuit and a compensating circuit; The input coupling of the input of described buffer circuit and first three-phase full-bridge rectifier, the output of described buffer circuit and the input of described compensating circuit coupling; Described first three-phase full-bridge rectifier output and compensating circuit output are in series; The output of described compensating circuit and correction waveform equivalence, described correction waveform are that the voltage that described first three-phase full-bridge rectifier is exported be multiply by-1, and the amplitude of adding the first three-phase full-bridge rectifier input voltage obtains; Described buffer circuit is the voltage-dropping type isolating transformer, and described compensating circuit comprises chopper, bypass circuit and second three-phase full-bridge rectifier, and described second three-phase full-bridge rectifier is with in parallel with described bypass circuit again after described chopper is connected; During described chopper conducting, the output voltage of the output voltage of second three-phase full-bridge rectifier and first three-phase full-bridge rectifier is applied output, and when described chopper cut out, the output of first three-phase full-bridge rectifier was exported by bypass circuit.
The output line voltage of described voltage-dropping type isolating transformer is 13.4% of an input line voltage.
The former edge joint method of described voltage-dropping type isolating transformer is star-like, and the secondary connection is a triangular form, and the former edge joint method of perhaps described isolating transformer is a triangular form, and the secondary connection is star-like.
Described chopper is the full-controlled switch device, and described bypass circuit is a diode.
The beneficial effect that the present invention is compared with the prior art is: the present invention utilizes compensating circuit to connect with first three-phase full-bridge rectifier, compensating circuit utilizes the voltage principle of stacking in the mode of filling out paddy the voltage waveform of first three-phase full-bridge rectifier output to be repaired, make the level and smooth and pulsation rate decline of voltage waveform after synthesizing, the present invention has improved the voltage waveform of exporting by low-cost, high efficiency method, has eliminated harmonic wave.The present invention can reduce the capacitance of back level filter capacitor, thereby reduces the cost of whole three-phase rectification flat wave circuit.
Description of drawings
Fig. 1 is the electrical block diagram of the specific embodiment of the invention one;
Fig. 2 is the work wave schematic diagram of the specific embodiment of the invention one;
Fig. 3 is the electrical block diagram of the specific embodiment of the invention two;
Fig. 4 is the work wave schematic diagram of the specific embodiment of the invention two.
Embodiment
Also in conjunction with the accompanying drawings the present invention is described in further details below by concrete execution mode.
Embodiment one
As shown in Figure 1, a kind of three-phase rectifying flat wave circuit comprises first three-phase full-bridge rectifier 2, buffer circuit 1 and compensating circuit 6.The input coupling of the input of described buffer circuit 1 and first three-phase full-bridge rectifier 2, the input of described buffer circuit 1 also is connected to three phase mains; The input coupling of the output of described buffer circuit 1 and compensating circuit 6.2 outputs of described first three-phase full-bridge rectifier and compensating circuit 6 outputs are coupled.The output of compensating circuit 6 and correction waveform equivalence, described correction waveform are that the voltage that described first three-phase full-bridge rectifier 2 is exported be multiply by-1, and the amplitude of adding first three-phase full-bridge rectifier, 2 input voltages obtains.Described compensating circuit 6 comprises chopper 4, bypass circuit 5 and second three-phase full-bridge rectifier 3, and described second three-phase full-bridge rectifier 3 is with in parallel with described bypass circuit 5 again after described chopper 4 is connected; During described chopper 4 conductings, the output voltage of the output voltage of first three-phase full-bridge rectifier 2 and second three-phase full-bridge rectifier 3 is applied output, and when described chopper 4 cut out, the output of first three-phase full-bridge rectifier 2 was by bypass circuit 5 outputs.
Described buffer circuit 1 is an isolating transformer, and the former edge joint method of described isolating transformer is a triangular form, and the secondary connection is star-like.Make the peak value of the pulsating dc voltage that peak value and first three-phase full-bridge rectifier 2 of the pulsating dc voltage of second three-phase full-bridge rectifier 3 output export differ 30 °.Certainly, also can make isolating transformer secondary connection is triangular form, and former edge joint method is star-like.Described isolating transformer is a step-down transformer, and output line voltage is 13.4% of an input line voltage.The power of described first three-phase full-bridge rectifier 2 is greater than the power of second three-phase full-bridge rectifier 3.Described bypass circuit is diode D.Described chopper is full-controlled switch device Q, is used for the voltage of second three-phase full-bridge rectifier, 3 outputs is cut into pulse-width modulation (Pulse Width Modulation is called for short PWM) ripple.Described full-controlled switch device can be insulated gate bipolar power tube (Insulated Gate Bipolar Transistor, be called for short IGBT) or metal oxide semiconductor field effect tube (Metal Oxide Silicon Field EffectTransistor is called for short MOSFET).Adopt IGBT as chopper in this embodiment.The output coupling of the collector electrode of described IGBT and second three-phase full-bridge rectifier 3, its grid is connected to control signal, the negative electrode of its emitter-base bandgap grading and described diode D is coupled, and the anode of described diode D is connected between first three-phase full-bridge rectifier 2 and second three-phase full-bridge rectifier 3.
Described three-phase rectifying flat wave circuit also comprises filter capacitor C and smoothing reactor L, and described filter capacitor C is connected across between the positive output bus, negative output bus of three-phase rectifying flat wave circuit.Described smoothing reactor L is connected between the negative electrode and filter capacitor C of diode D.
The operation principle of above-mentioned three-phase rectifying flat wave circuit is as follows: during full-controlled switch device Q conducting, diode D closes, the output voltage that the electric current of first three-phase full-bridge rectifier 2 output flows through the output voltage of second three-phase full-bridge rectifier, 3, the first three-phase full-bridge rectifiers 2 and second three-phase full-bridge rectifier 3 superposes and exports as whole three-phase rectification flat wave circuit; When full-controlled switch device Q turn-offs, diode D conducting, the electric current of first three-phase full-bridge rectifier, 2 outputs directly flows through diode, and the voltage of first three-phase full-bridge rectifier, 2 outputs is just directly exported as whole three-phase rectification flat wave circuit.Like this, second three-phase full-bridge rectifier 3 utilizes the voltage principle of stacking in the mode of filling out paddy the voltage waveform of first three-phase full-bridge rectifier, 2 outputs to be repaired, and makes the level and smooth and pulsation rate decline of voltage waveform after synthesizing.
As shown in Figure 2, the work wave of above-mentioned three-phase rectifying flat wave circuit is analyzed as follows: W is the voltage waveform view of second three-phase full-bridge rectifier, 3 outputs among the figure, X is the voltage waveform view of first three-phase full-bridge rectifier, 2 outputs, and the peak value of direct voltage between the two differs 30 °.We can see that first three-phase full-bridge rectifier, 2 output voltage amplitude are that U, valley point voltage are 0.866U.For the output voltage that makes whole three-phase rectification flat wave circuit is level and smooth as much as possible, through the voltage of second three-phase full-bridge rectifier, 3 outputs after copped wave should with correction waveform M equivalence as far as possible.The waveform of M is by the voltage of first three-phase full-bridge rectifier 2 output be multiply by-1, adds that U obtains.The voltage wave that we export second three-phase full-bridge rectifier 3 by chopper carries out copped wave, obtains a pulse-width modulation (Pulse Width Modulation is called for short PWM) waveform Y.Its pulsewidth is the wideest in the valley position of X, diminishes gradually toward position, valley both sides.PWM waveform Y and correction waveform M are close to equivalence.This makes that in three-phase rectifying flat wave circuit of the present invention the voltage that first three-phase full-bridge rectifier 2 is exported can be repaired by the voltage of second three-phase full-bridge rectifier, 3 outputs, makes level and smooth, the pulsation rate decline of voltage waveform after synthesizing.
Embodiment two
As shown in Figure 3, this embodiment is with the difference of embodiment one: compensating circuit 6 has two, series connection mutually between each compensating circuit 6.The output of isolating transformer has two groups, and the input with two compensating circuits 6 is coupled respectively, and the former edge joint method of isolating transformer is a triangular form, and the secondary connection all is star-like.Certainly, also can make isolating transformer secondary connection all is triangular form, and former edge joint method is star-like.If the voltage of second three-phase full-bridge rectifier, 3 outputs of each compensating circuit 6 is identical, the secondary line voltage of isolating transformer is 6.7% of former sideline voltage, can constitute two kinds of level of A, 2A (or B, 2B), if the voltage difference of second three-phase full-bridge rectifier, 3 outputs of each compensating circuit 6 just can constitute A, B, three kinds of level of A+B.A, B are respectively the voltage of second three-phase full-bridge rectifier, 3 outputs of two compensating circuits 6.This embodiment can be used in high-tension occasion, can reduce the withstand voltage of full-controlled switch device Q, and reduces the switching frequency of full-controlled switch device Q.This can reduce the cost of the employed full-controlled switch device of this embodiment Q
As shown in Figure 4, the work wave of the three-phase rectifying flat wave circuit of this embodiment is analyzed as follows: Y is the waveform of the chopper Q2 output of second compensating circuit, PWM waveform for pulse width variations, its pulsewidth is the wideest in the valley position near first three-phase full-bridge rectifier, 2 output voltages, diminishes gradually toward position, valley both sides; X is the waveform of the chopper Q1 output of first compensating circuit, also is the PWM waveform of pulse width variations, and its pulsewidth is the wideest near the valley position of first three-phase full-bridge rectifier, 2 output voltages, diminishes gradually toward position, valley both sides pulsewidth.W is the oscillogram of Q1, Q2 stack, and the waveform of W and correction waveform M are very approaching.This embodiment is more equivalent by waveform and correction waveform that two compensating circuits obtain, after the voltage of first three-phase full-bridge rectifier, 2 outputs is revised, can make the voltage waveform of whole three-phase rectification flat wave circuit output more level and smooth.
Embodiment three
This embodiment is with the difference of embodiment one: compensating circuit 6 has three, series connection mutually between each compensating circuit 6.The output of isolating transformer has three groups, and the input with three compensating circuits 6 is coupled respectively, and the former edge joint method of isolating transformer is a triangular form, and the secondary connection all is star-like.Certainly, also can make isolating transformer secondary connection all is triangular form, and former edge joint method is star-like.If the voltage of second three-phase full-bridge rectifier, 3 outputs of each compensating circuit 6 is identical, the secondary line voltage of isolating transformer is 4.47% of former sideline voltage, constitute A, 2A, three kinds of level of 3A (A=B=C), if the voltage of second three-phase full-bridge rectifier, 3 outputs of each compensating circuit 6 has nothing in common with each other, can constitute A, B, C, A+B, A+C, B+C, seven kinds of level of A+B+C, A, B, C are the voltage that is respectively second three-phase full-bridge rectifier, 3 outputs of three compensating circuits 6.Level number is many more, and just low more, equivalent effect is just good more for the frequency of the PWM series square wave of pulse width variations and equivalent correction waveform.
Second three-phase full-bridge rectifier 3 adopts rectifier diode to constitute described in this embodiment, thereby reduces the cost of whole three-phase rectification flat wave circuit.Can certainly adopt the full-controlled switch device to be built into second three-phase full-bridge rectifier 3, this moment, chopper 4 can remove, and directly realized that with the full-controlled switch device of second three-phase full-bridge rectifier 3 copped wave gets final product.Certainly also can adopt half control type switching device (as: thyristor) to be built into second three-phase full-bridge rectifier 3.Obviously, also can set up filter capacitor in the compensating circuit 6, this filter capacitor is in parallel with second three-phase full-bridge rectifier 3.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (9)
1. three-phase rectifying flat wave circuit, comprise first three-phase full-bridge rectifier (2), it is characterized in that: also comprise buffer circuit (1) and at least two compensating circuits (6), series connection mutually between each compensating circuit (6), the input coupling of the input of described buffer circuit (1) and first three-phase full-bridge rectifier (2), the input coupling of the output of described buffer circuit (1) and described compensating circuit (6); Described first three-phase full-bridge rectifier (2) output and compensating circuit (6) output are in series; Synthetic back of the output of all compensating circuits (6) and correction waveform equivalence, described correction waveform is that the voltage that described first three-phase full-bridge rectifier (2) is exported be multiply by-1, the amplitude of adding first three-phase full-bridge rectifier (2) input voltage obtains;
Described compensating circuit (6) comprises chopper (4), bypass circuit (5) and second three-phase full-bridge rectifier (3), and described second three-phase full-bridge rectifier (3) is with in parallel with described bypass circuit (5) again after described chopper (4) is connected; During described chopper (4) conducting, the output voltage of the output voltage of second three-phase full-bridge rectifier (3) and first three-phase full-bridge rectifier (2) is applied output, described chopper (4) is when cutting out, and the output of first three-phase full-bridge rectifier (2) is by bypass circuit (5) output; Described buffer circuit (1) is the voltage-dropping type isolating transformer.
2. three-phase rectifying flat wave circuit according to claim 1 is characterized in that: the former edge joint method of described voltage-dropping type isolating transformer is star-like, and the secondary connection is a triangular form, and the former edge joint method of perhaps described voltage-dropping type isolating transformer is a triangular form, and the secondary connection is star-like.
3. three-phase rectifying flat wave circuit according to claim 1 is characterized in that: described chopper is full-controlled switch device (Q), and described bypass circuit is diode (D).
4. according to the arbitrary described three-phase rectifying flat wave circuit of claim 1-3, it is characterized in that: described compensating circuit (6) is two,
The output line voltage of described voltage-dropping type isolating transformer (1) is 6.7% of an input line voltage.
5. according to the arbitrary described three-phase rectifying flat wave circuit of claim 1-3, it is characterized in that: described compensating circuit (6) is three, and the output line voltage of described voltage-dropping type isolating transformer (1) is 4.47% of an input line voltage.
6. a three-phase rectifying flat wave circuit comprises first three-phase full-bridge rectifier (2), it is characterized in that: also comprise a buffer circuit (1) and a compensating circuit (6); The input coupling of the input of described buffer circuit (1) and first three-phase full-bridge rectifier (2), the input coupling of the output of described buffer circuit (1) and described compensating circuit (6); Described first three-phase full-bridge rectifier (2) output and compensating circuit (6) output are in series; The output of described compensating circuit (6) and correction waveform equivalence, described correction waveform are that the voltage that described first three-phase full-bridge rectifier (2) is exported be multiply by-1, and the amplitude of adding first three-phase full-bridge rectifier (2) input voltage obtains; Described buffer circuit (1) is the voltage-dropping type isolating transformer, described compensating circuit (6) comprises chopper (4), bypass circuit (5) and second three-phase full-bridge rectifier (3), and described second three-phase full-bridge rectifier (3) is with in parallel with described bypass circuit (5) again after described chopper (4) is connected; During described chopper (4) conducting, the output voltage of the output voltage of second three-phase full-bridge rectifier (3) and first three-phase full-bridge rectifier (2) is applied output, described chopper (4) is when cutting out, and the output of first three-phase full-bridge rectifier (2) is by bypass circuit (5) output.
7. three-phase rectifying flat wave circuit according to claim 6 is characterized in that: the output line voltage of described voltage-dropping type isolating transformer (1) is 13.4% of an input line voltage.
8. according to claim 6 or 7 described three-phase rectifying flat wave circuits, it is characterized in that: the former edge joint method of described voltage-dropping type isolating transformer is star-like, and the secondary connection is a triangular form, and the former edge joint method of perhaps described isolating transformer is a triangular form, and the secondary connection is star-like.
9. according to claim 6 or 7 described three-phase rectifying flat wave circuits, it is characterized in that: described chopper is full-controlled switch device (Q), and described bypass circuit is diode (D).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101250413A CN100561837C (en) | 2007-12-17 | 2007-12-17 | A kind of three-phase rectifying flat wave circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007101250413A CN100561837C (en) | 2007-12-17 | 2007-12-17 | A kind of three-phase rectifying flat wave circuit |
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| Publication Number | Publication Date |
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| CN101202497A CN101202497A (en) | 2008-06-18 |
| CN100561837C true CN100561837C (en) | 2009-11-18 |
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| CNB2007101250413A Expired - Fee Related CN100561837C (en) | 2007-12-17 | 2007-12-17 | A kind of three-phase rectifying flat wave circuit |
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- 2007-12-17 CN CNB2007101250413A patent/CN100561837C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 抑制大功率整流电路谐波的三次谐波电流注入法. 姚大伟，陈柏超.电网技术，第26卷第10期. 2002 |
| 抑制大功率整流电路谐波的三次谐波电流注入法. 姚大伟，陈柏超.电网技术，第26卷第10期. 2002 * |
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Assignee: Hubei Emerson Automation System Engineering Co.,Ltd. Assignor: Ding Zhenrong Contract record no.: 2010440001352 Denomination of invention: Three-phase rectifying flat wave circuit Granted publication date: 20091118 License type: Exclusive License Open date: 20080618 Record date: 20100827 |
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