CN103997230A - Intermediate frequency furnace based on full-wave chopped mode rectifying circuits - Google Patents
Intermediate frequency furnace based on full-wave chopped mode rectifying circuits Download PDFInfo
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- CN103997230A CN103997230A CN201410199010.2A CN201410199010A CN103997230A CN 103997230 A CN103997230 A CN 103997230A CN 201410199010 A CN201410199010 A CN 201410199010A CN 103997230 A CN103997230 A CN 103997230A
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Abstract
The invention provides an intermediate frequency furnace based on full-wave chopped mode rectifying circuits. The intermediate frequency furnace is formed by a three-phase alternating-current power source, a transformer, the N full-wave chopped mode rectifying circuits, a direct-current filter circuit, an inverter power source and an induction coil. Each full-wave chopped mode rectifying circuit is formed by a diode rectifying circuit and a multi-chopper circuit, the deformation rate of the current on the alternating-current side of the full-wave chopped mode rectifying circuit is small, and when the direct-current sides of three single-phase full-wave chopped mode rectifying circuits are connected in series to form a three-phase full-wave chopped mode rectifying circuit, the output voltage on the direct-current side of the three-phase full-wave chopped mode rectifying circuit is a stable direct voltage and can be adjusted between zero and a maximum value at will. The transformer is a common industrial frequency transformer, an alternating-current side reactive compensation and filter device is not needed, and therefore the device investment and the operating cost are greatly reduced.
Description
Technical field
The present invention relates to a kind of power conversion apparatus, in particular, relate to a kind of intermediate frequency furnace of cutting control rectifying circuit based on all-wave.
Background technology
Intermediate frequency furnace is a kind of typical nonlinear load, it adopts the mode of thyristor rectifier that AC rectification is become to direct current, produces a large amount of harmonic currents in its running, has caused serious pollution to electric power system, therefore need to increase reactive power compensation and filter apparatus, filtering harmonic current; Loss when this has increased equipment investment and operation greatly.In addition, intermediate frequency furnace generally need to be equipped with rectifier transformer, for voltage transitions is arrived to suitable electric pressure, if when the power of intermediate frequency furnace is larger, just need to adopt 12 pulse wave rectifiers or 24 pulse wave rectifiers, due to many than common transformer costliness of rectifier transformer, loss is also very large, and the equipment investment therefore being produced by transformer and running wastage are also very large.
Some producers use the controlled rectification circuit based on IGBT to replace scr rectification circuit, and for powering to tandem type intermediate frequency furnace, its ac-side current distortion is very little, and power factor is very high, does not need reactive power compensation and filter apparatus.But the controlled rectification circuit finite capacity based on IGBT, and extensibility is not strong, apparatus expensive, controls complicatedly, reliability is lower, the occasion of middle low power also reluctantly can, but in powerful occasion, just cannot be competent at.
Summary of the invention
Based on the deficiencies in the prior art, the invention provides a kind of intermediate frequency furnace of cutting control rectifying circuit based on all-wave, it is very little that wherein all-wave is cut the ac-side current distortion of control rectifying circuit, and power factor is very high, the output of its DC side is that a galvanic current is pressed, and 0 to adjustable arbitrarily between maximum.
The present invention adopts following methods to realize object of the present invention.
An intermediate frequency furnace of cutting control rectifying circuit based on all-wave, is characterized in that: by three-phase alternating-current supply, and transformer, N all-wave cut control rectifying circuit, and inverter circuit and induction coil form.
Wherein three-phase alternating-current supply connects the first siding ring of transformer, the second siding ring of transformer is isolated mutually, the output of each coil connects all-wave cuts the ac input end of control rectifying circuit, the DC side output that N all-wave cut control rectifying circuit is connected in series, then receive on DC filtering circuit, the DC side input of another side joint inverter circuit of DC filtering circuit, the AC output of inverter circuit connects induction coil.
DC filtering circuit has electric capacity or inductance to form, and it act as the fluctuation that suppresses all-wave and cut the voltage and current of control rectifying circuit output, for inverter circuit provides a stable voltage and current, and interference simultaneously that also suppress inverter circuit and all-wave is cut to control rectifying circuit.
All-wave is cut control rectifying circuit and is comprised single-phase full bridge diode rectifier circuit, filter capacitor, compensating circuit, multiple chopper circuit.
Single-phase full bridge diode rectifier circuit is cut the interchange input of control rectifying circuit as all-wave, the direct current side joint filter capacitor (C) of single-phase full bridge diode rectifier circuit, the input of multiple chopper circuit connects the two ends of filter capacitor (C), and the output of control rectifying circuit is cut in the output of multiple chopper circuit as all-wave; The wherein charging and discharging currents that act as building-out capacitor of compensating circuit.
Wherein multiple chopper circuit is made up of multiple substance buck circuits, wherein substance buck circuit is by IGBT(T), diode (D) and inductance (L) form, the collector electrode of IGBT is as the positive pole input of chopper circuit, the emitter of IGBT, the negative electrode of diode (D) is connected with one end of inductance (L), and the anode of diode (D) is as the negative pole of the input of chopper circuit and the negative pole of output, and the other end of inductance (L) is as the positive pole of chopper circuit output.
The positive pole input of multiple substance chopper circuits is connected as the positive pole input of multiple chopper circuit, the negative pole input of multiple substance chopper circuits is connected as the negative pole input of multiple chopper circuit, the positive pole output of multiple substance chopper circuits is connected as the positive pole output of multiple chopper circuit, and the negative pole output of multiple substance chopper circuits is connected as the negative pole output of multiple chopper circuit.
A kind of intermediate frequency furnace of cutting control rectifying circuit based on all-wave as claimed in claim 1, is characterized in that: the duty ratio of the IGBT in described multiple chopper circuit is:
(1)。
Wherein D is the duty ratio of IGBT in described DC chopper circuit, and Vdc is described diode rectifier circuit DC voltage instantaneous value, I
1for DC chopper circuit outlet side electric current, G is equivalent conductance; By controlling the size of equivalent conductance (G), just can control the size of Output Voltage in Rectified Circuits.
Wherein filter capacitor (C) and chopper circuit can be equivalent to an electricity and lead as the electricity of G and lead, and are connected to the DC side of diode rectifier circuit, thereby make the ac-side current of diode rectifier circuit for sinusoidal wave.
The output voltage that all-wave is cut control rectifying circuit is:
（2）。
If the mathematic(al) representation of diode AC voltage is:
（3）。
Diode direct-current side voltage expression formula is:
（4）。
Bringing formula (4) into formula (2) can obtain all-wave and cut the output voltage of control rectifying circuit and be:
（5）。
Can be seen by formula (5), all-wave is cut in the output voltage of control rectifying circuit and is contained DC component and harmonic.
The secondary side of described transformer is made up of one or more groups three-phase alternating-current supply, supposes that wherein the voltage of one group of three-phase alternating-current supply is:
（6）。
Can obtain each all-wave according to formula (5) cuts the output voltage of control rectifying circuit and is:
（7）。
The DC side of cutting control rectifying circuit due to all-wave is connected in series, and its DC side output voltage is:
（8）。
Formula (7) substitution formula (8) can be obtained:
（9）。
Can be found out by formula (9), the DC side output voltage that three-phase full-wave is cut control rectifying circuit is that a galvanic current is pressed, single all-wave is cut after the DC side series connection of control rectifying circuit, frequency multiplication wave component in its output voltage has been cancelled out each other, and the electric current of three-phase alternating-current supply input is sinusoidal wave, can change by changing the size of equivalent conductance (G) output voltage of three-phase half-controlled rectifier circuit.
Described compensating circuit is by main H bridge submodule (SM), one or more auxiliary H bridge submodule (SM
1~ SM
n) and inductance (L
1) form, wherein the direct current side joint all-wave claimed in claim 1 of main H bridge submodule (SM) is cut the diode rectifier circuit DC side filter capacitor (C) in control rectifying circuit, the AC of auxiliary H bridge submodule, inductance (L
1) and the AC of main H bridge submodule (SM) be connected in series successively, form a loop; Auxiliary H bridge submodule (SM
1~ SM
n) direct current side joint electric capacity (C
1~ C
n), for the DC voltage of stable auxiliary H bridge submodule;
The control method of main H bridge submodule (SM) is: diode rectifier circuit AC voltage (V
ac) be timing, the AC output positive voltage (T of main H bridge submodule
1and T
4conducting), diode rectifier circuit AC voltage (V
ac) when negative, the AC output negative voltage (T of main H bridge submodule
2and T
3conducting), now, the AC output voltage of main H bridge submodule and diode rectifier circuit AC voltage (V
ac) instantaneous value equate; Main H bridge submodule (SM), auxiliary H bridge submodule (SM
1~ SM
n) and a single-phase STATCOM system of inductance formation;
By controlling auxiliary H bridge submodule (SM
1~ SM
n) AC output voltage can control the reactive power of this single-phase STATCOM system output, by adjusting the size of this reactive power, can make that the perception of single-phase STATCOM system is idle cancels out each other with capacitive reactive power diode direct-current side filter capacitor (C), thereby the capacitive reactive power of compensation filter electric capacity (C) is cut the impact of control rectifying circuit AC waveform on all-wave.
Adopt solution provided by the present invention can be achieved as follows benefit.
It is very little that all-wave is cut the ac-side current distortion of control rectifying circuit, and power factor is very high, does not therefore need alternating current filter and reactive-load compensation equipment.
Adopt common Industrial Frequency Transformer to replace rectifier transformer, reduced equipment investment and running wastage.
The extensibility that all-wave is cut control rectifying circuit is strong, can expand to the application scenario of high-voltage great-current.
Adopt mesolow IGBT, its cost is low, and loss is little.
Multiple chopper circuit and all-wave are cut control rectifying circuit and are adopted modularized design, are easy to safeguard.
Brief description of the drawings
Fig. 1 is the intermediate frequency furnace of cutting control rectifying circuit based on all-wave.
Fig. 2 is the structure chart that all-wave is cut control rectifying circuit.
Fig. 3 is the structure chart of compensating circuit.
Embodiment
An intermediate frequency furnace of cutting control rectifying circuit based on all-wave, is characterized in that: by three-phase alternating-current supply, and transformer, N all-wave cut control rectifying circuit, and inverter circuit and induction coil form.
Wherein three-phase alternating-current supply connects the first siding ring of transformer, the second siding ring of transformer is isolated mutually, the output of each coil connects all-wave cuts the ac input end of control rectifying circuit, the DC side output that N all-wave cut control rectifying circuit is connected in series, then receive on DC filtering circuit, the DC side input of another side joint inverter circuit of DC filtering circuit, the AC output of inverter circuit connects induction coil.
DC filtering circuit has electric capacity or inductance to form, and it act as the fluctuation that suppresses all-wave and cut the voltage and current of control rectifying circuit output, for inverter circuit provides a stable voltage and current, and interference simultaneously that also suppress inverter circuit and all-wave is cut to control rectifying circuit.
All-wave is cut control rectifying circuit and is comprised single-phase full bridge diode rectifier circuit, filter capacitor, compensating circuit, multiple chopper circuit.
Single-phase full bridge diode rectifier circuit is cut the interchange input of control rectifying circuit as all-wave, the direct current side joint filter capacitor (C) of single-phase full bridge diode rectifier circuit, the input of multiple chopper circuit connects the two ends of filter capacitor (C), and the output of control rectifying circuit is cut in the output of multiple chopper circuit as all-wave; The wherein charging and discharging currents that act as building-out capacitor of compensating circuit.
Wherein multiple chopper circuit is made up of multiple substance buck circuits, wherein substance buck circuit is by IGBT(T), diode (D) and inductance (L) form, the collector electrode of IGBT is as the positive pole input of chopper circuit, the emitter of IGBT, the negative electrode of diode (D) is connected with one end of inductance (L), and the anode of diode (D) is as the negative pole of the input of chopper circuit and the negative pole of output, and the other end of inductance (L) is as the positive pole of chopper circuit output.
The positive pole input of multiple substance chopper circuits is connected as the positive pole input of multiple chopper circuit, the negative pole input of multiple substance chopper circuits is connected as the negative pole input of multiple chopper circuit, the positive pole output of multiple substance chopper circuits is connected as the positive pole output of multiple chopper circuit, and the negative pole output of multiple substance chopper circuits is connected as the negative pole output of multiple chopper circuit.
A kind of intermediate frequency furnace of cutting control rectifying circuit based on all-wave as claimed in claim 1, is characterized in that: the duty ratio of the IGBT in described multiple chopper circuit is:
(1)。
Wherein D is the duty ratio of IGBT in described DC chopper circuit, and Vdc is described diode rectifier circuit DC voltage instantaneous value, I
1for DC chopper circuit outlet side electric current, G is equivalent conductance; By controlling the size of equivalent conductance (G), just can control the size of Output Voltage in Rectified Circuits.
Wherein filter capacitor (C) and chopper circuit can be equivalent to an electricity and lead as the electricity of G and lead, and are connected to the DC side of diode rectifier circuit, thereby make the ac-side current of diode rectifier circuit for sinusoidal wave.
The output voltage that all-wave is cut control rectifying circuit is:
（2）。
If the mathematic(al) representation of diode AC voltage is:
（3）。
Diode direct-current side voltage expression formula is:
（4）。
Bringing formula (4) into formula (2) can obtain all-wave and cut the output voltage of control rectifying circuit and be:
（5）。
Can be seen by formula (5), all-wave is cut in the output voltage of control rectifying circuit and is contained DC component and harmonic.
The secondary side of described transformer is made up of one or more groups three-phase alternating-current supply, supposes that wherein the voltage of one group of three-phase alternating-current supply is:
（6）。
Can obtain each all-wave according to formula (5) cuts the output voltage of control rectifying circuit and is:
（7）。
The DC side of cutting control rectifying circuit due to all-wave is connected in series, and its DC side output voltage is:
（8）。
Formula (7) substitution formula (8) can be obtained:
（9）。
Can be found out by formula (9), the DC side output voltage that three-phase full-wave is cut control rectifying circuit is that a galvanic current is pressed, single all-wave is cut after the DC side series connection of control rectifying circuit, frequency multiplication wave component in its output voltage has been cancelled out each other, and the electric current of three-phase alternating-current supply input is sinusoidal wave, can change by changing the size of equivalent conductance (G) output voltage of three-phase half-controlled rectifier circuit.
Described compensating circuit is by main H bridge submodule (SM), one or more auxiliary H bridge submodule (SM
1~ SM
n) and inductance (L
1) form, wherein the direct current side joint all-wave claimed in claim 1 of main H bridge submodule (SM) is cut the diode rectifier circuit DC side filter capacitor (C) in control rectifying circuit, the AC of auxiliary H bridge submodule, inductance (L
1) and the AC of main H bridge submodule (SM) be connected in series successively, form a loop; Auxiliary H bridge submodule (SM
1~ SM
n) direct current side joint electric capacity (C
1~ C
n), for the DC voltage of stable auxiliary H bridge submodule;
The control method of main H bridge submodule (SM) is: diode rectifier circuit AC voltage (V
ac) be timing, the AC output positive voltage (T of main H bridge submodule
1and T
4conducting), diode rectifier circuit AC voltage (V
ac) when negative, the AC output negative voltage (T of main H bridge submodule
2and T
3conducting), now, the AC output voltage of main H bridge submodule and diode rectifier circuit AC voltage (V
ac) instantaneous value equate; Main H bridge submodule (SM), auxiliary H bridge submodule (SM
1~ SM
n) and a single-phase STATCOM system of inductance formation;
By controlling auxiliary H bridge submodule (SM
1~ SM
n) AC output voltage can control the reactive power of this single-phase STATCOM system output, by adjusting the size of this reactive power, can make that the perception of single-phase STATCOM system is idle cancels out each other with capacitive reactive power diode direct-current side filter capacitor (C), thereby the capacitive reactive power of compensation filter electric capacity (C) is cut the impact of control rectifying circuit AC waveform on all-wave.
Claims (3)
1. an intermediate frequency furnace of cutting control rectifying circuit based on all-wave, is characterized in that: by three-phase alternating-current supply, and transformer, N all-wave cut control rectifying circuit, and inverter circuit and induction coil form;
Wherein three-phase alternating-current supply connects the first siding ring of transformer, the second siding ring of transformer is isolated mutually, the output of each coil connects all-wave cuts the ac input end of control rectifying circuit, the DC side output that N all-wave cut control rectifying circuit is connected in series, then receive on DC filtering circuit, the DC side input of another side joint inverter circuit of DC filtering circuit, the AC output of inverter circuit connects induction coil;
DC filtering circuit has electric capacity or inductance to form, and it act as the fluctuation that suppresses all-wave and cut the voltage and current of control rectifying circuit output, for inverter circuit provides a stable voltage and current, and interference simultaneously that also suppress inverter circuit and all-wave is cut to control rectifying circuit;
All-wave is cut control rectifying circuit and is comprised single-phase full bridge diode rectifier circuit, filter capacitor, compensating circuit, multiple chopper circuit;
Single-phase full bridge diode rectifier circuit is cut the interchange input of control rectifying circuit as all-wave, the direct current side joint filter capacitor (C) of single-phase full bridge diode rectifier circuit, the input of multiple chopper circuit connects the two ends of filter capacitor (C), and the output of control rectifying circuit is cut in the output of multiple chopper circuit as all-wave; The wherein charging and discharging currents that act as building-out capacitor of compensating circuit;
Wherein multiple chopper circuit is made up of multiple substance buck circuits, wherein substance buck circuit is by IGBT(T), diode (D) and inductance (L) form, the collector electrode of IGBT is as the positive pole input of chopper circuit, the emitter of IGBT, the negative electrode of diode (D) is connected with one end of inductance (L), and the anode of diode (D) is as the negative pole of the input of chopper circuit and the negative pole of output, and the other end of inductance (L) is as the positive pole of chopper circuit output;
The positive pole input of multiple substance chopper circuits is connected as the positive pole input of multiple chopper circuit, the negative pole input of multiple substance chopper circuits is connected as the negative pole input of multiple chopper circuit, the positive pole output of multiple substance chopper circuits is connected as the positive pole output of multiple chopper circuit, and the negative pole output of multiple substance chopper circuits is connected as the negative pole output of multiple chopper circuit.
2. a kind of intermediate frequency furnace of cutting control rectifying circuit based on all-wave as claimed in claim 1, is characterized in that: the duty ratio of the IGBT in described multiple chopper circuit is:
(1)
Wherein D is the duty ratio of IGBT in described DC chopper circuit, and Vdc is described diode rectifier circuit DC voltage instantaneous value, I
1for DC chopper circuit outlet side electric current, G is equivalent conductance; By controlling the size of equivalent conductance (G), just can control the size of Output Voltage in Rectified Circuits;
Wherein filter capacitor (C) and chopper circuit can be equivalent to an electricity and lead as the electricity of G and lead, and are connected to the DC side of diode rectifier circuit, thereby make the ac-side current of diode rectifier circuit for sinusoidal wave;
The output voltage that all-wave is cut control rectifying circuit is:
（2）
If the mathematic(al) representation of diode rectifier circuit AC voltage is:
（3）
Diode rectifier circuit DC voltage expression formula is:
（4）
Bringing formula (4) into formula (2) can obtain all-wave and cut the output voltage of control rectifying circuit and be:
（5）
Can be seen by formula (5), all-wave is cut in the output voltage of control rectifying circuit and is contained DC component and harmonic;
The secondary side of described transformer is made up of one or more groups three-phase alternating-current supply, supposes that wherein the voltage of one group of three-phase alternating-current supply is:
（6）
Can obtain each all-wave according to formula (5) cuts the output voltage of control rectifying circuit and is:
（7）
The DC side of cutting control rectifying circuit due to all-wave is connected in series, and its DC side output voltage is:
（8）
Formula (7) substitution formula (8) can be obtained:
（9）
Can be found out by formula (9), the DC side output voltage that three-phase full-wave is cut control rectifying circuit is that a galvanic current is pressed, single all-wave is cut after the DC side series connection of control rectifying circuit, frequency multiplication wave component in its output voltage has been cancelled out each other, and the electric current of three-phase alternating-current supply input is sinusoidal wave, can change by changing the size of equivalent conductance (G) output voltage of three-phase half-controlled rectifier circuit.
3. a kind of intermediate frequency furnace of cutting control rectifying circuit based on all-wave as claimed in claim 1, is characterized in that: described compensating circuit is by main H bridge submodule (SM), one or more auxiliary H bridge submodule (SM
1~ SM
n) and inductance (L
1) form, wherein the direct current side joint all-wave claimed in claim 1 of main H bridge submodule (SM) is cut the diode rectifier circuit DC side filter capacitor (C) in control rectifying circuit, the AC of auxiliary H bridge submodule, inductance (L
1) and the AC of main H bridge submodule (SM) be connected in series successively, form a loop; Auxiliary H bridge submodule (SM
1~ SM
n) direct current side joint electric capacity (C
1~ C
n), for the DC voltage of stable auxiliary H bridge submodule;
The control method of main H bridge submodule (SM) is: diode rectifier circuit AC voltage (V
ac) be timing, the AC output positive voltage (T of main H bridge submodule
1and T
4conducting), diode rectifier circuit AC voltage (V
ac) when negative, the AC output negative voltage (T of main H bridge submodule
2and T
3conducting), now, the AC output voltage of main H bridge submodule and diode rectifier circuit AC voltage (V
ac) instantaneous value equate; Main H bridge submodule (SM), auxiliary H bridge submodule (SM
1~ SM
n) and a single-phase STATCOM system of inductance formation;
By controlling auxiliary H bridge submodule (SM
1~ SM
n) AC output voltage can control the reactive power of this single-phase STATCOM system output, by adjusting the size of this reactive power, can make that the perception of single-phase STATCOM system is idle cancels out each other with capacitive reactive power diode direct-current side filter capacitor (C), thereby the capacitive reactive power of compensation filter electric capacity (C) is cut the impact of control rectifying circuit AC waveform on all-wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410199010.2A CN103997230A (en) | 2014-05-13 | 2014-05-13 | Intermediate frequency furnace based on full-wave chopped mode rectifying circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410199010.2A CN103997230A (en) | 2014-05-13 | 2014-05-13 | Intermediate frequency furnace based on full-wave chopped mode rectifying circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103997230A true CN103997230A (en) | 2014-08-20 |
Family
ID=51311266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410199010.2A Pending CN103997230A (en) | 2014-05-13 | 2014-05-13 | Intermediate frequency furnace based on full-wave chopped mode rectifying circuits |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105553289A (en) * | 2016-01-29 | 2016-05-04 | 深圳市共进电子股份有限公司 | Test system and signal isolation device |
| CN104578729B (en) * | 2014-12-22 | 2017-03-29 | 广州金升阳科技有限公司 | A kind of input filter method and the AC/DC switch converters using the method |
| CN113422519A (en) * | 2021-06-09 | 2021-09-21 | 深圳市云林电气技术有限公司 | Frequency converter topology based on harmonic compensation, control method and frequency converter |
| CN113708649A (en) * | 2021-09-10 | 2021-11-26 | 湖北春田电工技术有限公司 | High-power multi-output adjustable intermediate frequency power supply |
-
2014
- 2014-05-13 CN CN201410199010.2A patent/CN103997230A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578729B (en) * | 2014-12-22 | 2017-03-29 | 广州金升阳科技有限公司 | A kind of input filter method and the AC/DC switch converters using the method |
| CN105553289A (en) * | 2016-01-29 | 2016-05-04 | 深圳市共进电子股份有限公司 | Test system and signal isolation device |
| CN105553289B (en) * | 2016-01-29 | 2018-08-28 | 深圳市共进电子股份有限公司 | Test system and its signal isolation equipment |
| CN113422519A (en) * | 2021-06-09 | 2021-09-21 | 深圳市云林电气技术有限公司 | Frequency converter topology based on harmonic compensation, control method and frequency converter |
| CN113708649A (en) * | 2021-09-10 | 2021-11-26 | 湖北春田电工技术有限公司 | High-power multi-output adjustable intermediate frequency power supply |
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Application publication date: 20140820 |
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