CN204362336U - The high-power high-frequency induction heating power of multi-inverter parallel volume expansion structure - Google Patents
The high-power high-frequency induction heating power of multi-inverter parallel volume expansion structure Download PDFInfo
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- CN204362336U CN204362336U CN201520034781.6U CN201520034781U CN204362336U CN 204362336 U CN204362336 U CN 204362336U CN 201520034781 U CN201520034781 U CN 201520034781U CN 204362336 U CN204362336 U CN 204362336U
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Abstract
A kind of high-power high-frequency induction heating power of multi-inverter parallel volume expansion structure of the utility model Patent design, is mainly used in metal heat treatmet aspect.The inversion link of power supply adopts many group second order voltage source inverters in parallel, and the DC side parallel of shunt chopper, in same DC bus, is connected to high-frequency resistance matching transformer after often organizing the interchange outlet side series resonant capacitance of inverter again.The former limit of high frequency transformer adopts Multiple coil, and be connected to a certain winding of transformer primary side after often organizing inverter output end series resonant capacitance, the secondary of high frequency transformer is simplex winding, and the power output of each inverter carries out power combing at secondary.Shunt chopper does not have Power Exchange and energy flow each other, and power output is balanced, thus ensure that the safety of inverter and the stability of complete machine operation to greatest extent.And flexible some groups of inverters in parallel can be carried out by the power grade total according to power supply, thus improve power supply complete machine power significantly.
Description
Technical field
The utility model patent relates to a kind of high-power high-frequency induction heating power being applied to the employing multi-inverter parallel structure of metal heat treatmet.
Background technology
The advantages such as high-frequency induction heating power is efficient with it, energy-saving and environmental protection are widely applied in industries such as metal heat treatmets.At present, high-frequency induction heating power is just towards high frequency, high-power future development.The IGBT device of high-power grade is expensive on the one hand, on the other hand along with the further increase of power, single tube power grade is difficult to the power grade requirement meeting large power supply, so mostly adopt the direct parallel connection of IGBT to meet the needs of large power supply.Although use the parallel connection of multitube IGBT and achieved larger breakthrough, but because the impact of multiple composite factor is also difficult to the parameter of real elimination circuit various piece to the impact of characteristic in parallel in practical application, cause the dynamic not current-sharing of parallel IGBT module, and any one IGBT of parallel connection damages, to other device overcurrent be caused and damage, directly affects the Stability and dependability of large power supply, too increase cost and the technical difficulty of after-sale service.
Summary of the invention
In order to overcome unstable properties that existing large power supply adopts the direct parallel connection of IGBT to cause, power is difficult to the difficult problem that improves further, and the utility model patent adopts the parallel connection of many group inverters to increase the mode of complete machine power.
The technical scheme that the utility model patent solves the employing of its technical problem is: inversion link adopts many group second order voltage source inverters in parallel, the DC side parallel of shunt chopper, in same DC bus, is connected to high-frequency resistance matching transformer after often organizing the interchange outlet side series resonant capacitance of inverter again.The former limit of high frequency transformer adopts Multiple coil, and be connected to a certain winding of transformer primary side after often organizing inverter output end series resonant capacitance, the secondary of high frequency transformer is simplex winding, and the power output of each inverter carries out power combing at secondary.
the IGBT driving switch signal of the same position of each group inverter in parallel is synchronous, ensures synchronous conducting and the shutoff of IGBT, makes each group of inverter synchronous working, export the high-frequency ac voltage that phase place is identical with size.In practical application, consider the pulse signal phase delay that may make shunt chopper switching device logical delay of device, cause the phase place slightly difference of alternating voltage after inversion, so should not be directly in parallel in high frequency transformer high-pressure side, adopt the synthesis carrying out power in the series connection of high frequency transformer secondary load-side.
The high frequency electric source of second order LC multi-inverter parallel structure solve the overall performance that current high-power high-frequency induction heating power adopts the direct parallel connection of IGBT to cause unstable, reprocess the problems such as high.Power Exchange and energy flow can not be produced between this topological structure shunt chopper, make the power output of each inverter balanced, substantially increase the Stability and dependability that power supply runs.And can according to the needs of power grade, different group inverse of a number in parallel becomes device, ensure that the safety of inverter and the stability of complete machine operation well.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, the utility model patent is further illustrated.
Fig. 1 is high-power high-frequency induction heating power structured flowchart, and Fig. 2 is the electrical schematic diagram of the utility model patent high-power high-frequency induction heating power.Fig. 3 is the IGBT drive singal schematic diagram of shunt chopper, and Fig. 4 is control circuit schematic diagram.In Fig. 2, KM1 is main circuit A.C. contactor, KM2 electric capacity precharge A.C. contactor, and MU is three-phase bridge controlled rectification, adopt flat thyristor, R1 is pre-charge resistance, and C1, C2 are DC support filter capacitor, and R2, R3 are grading resistor, C3 ~ Cn is resonant capacitance, T1 ~ T8 is power electronic device IGBT, T is high-frequency resistance matching transformer, R
lbe induction coil with L.
Embodiment
With the parallel connection of 2 groups of inverters, embodiment is described below.The control of power supply adopts pulse width modulating chip SG3525A.As shown in Figure 2, T1, T4, T2, T3 are the power device of first group of inverter, and T5, T7, T6, T8 are the power device of second group of inverter.The operating state of these 4 IGBT of T1, T4, T5, T8 is identical, and the operating state of these 4 IGBT of T2, T3, T6, T7 is also identical, synchronous conducting and shutoff." T1, T4 ", " T5, T7 " are in one independently in inversion circuit respectively, by analysis, can not produce Power Exchange and energy flow between shunt chopper.
Inverter direct-flow side in parallel is connected on same DC bus, so the size of each inverter output voltage is substantially equal.The output current phase place of inverter depends on that the logical signal of each group of inverter IGBT is with or without delaying.Consider the difference of each inverter output voltage phase place, receive the former limit of high frequency transformer after adopting inverter output end series resonant capacitance again, carry out power combing at the secondary of high frequency transformer.There is multiple winding on the former limit of high frequency transformer, and the output voltage of each inverter is connected to one of them winding, and secondary only has a winding, carries out power combing.So aspergillus ficuum produces between the inverter of parallel connection, also produce power can not flow, thus ensure that the power output of each inverter is balanced.
By analyzing above, the output voltage of shunt chopper is for being flexible coupling, in different inverter synchronous working IGBT be in independently in inversion circuit, this relaxes to a certain extent to the conforming requirement of inverter, thus solves inconsistent dynamic this difficult problem of not current-sharing caused of IGBT parameter.Due between shunt chopper and aspergillus ficuum, and joint group number is unrestricted in theory, and the Capacity design of single group inverter is about 50 kW, can carry out flexible some groups of inverters in parallel by the power grade total according to power supply.Thus significantly can improve the power of large power supply, and function admirable, stability is strong.
Meanwhile, when certain group inverter breaks down, can turn off or block the pulse of this group IGBT, make this group inverter out of service, other inverter in parallel can continue normal operation, has stronger runnability.
Claims (2)
1. the high-power high-frequency induction heating power of a multi-inverter parallel volume expansion structure, inversion link adopts many group second order voltage source inverters in parallel, it is characterized in that: the DC side parallel of shunt chopper, in same DC bus, is connected to high-frequency resistance matching transformer after often organizing the interchange outlet side series resonant capacitance of inverter again.
2. the high-power high-frequency induction heating power of multi-inverter parallel volume expansion structure according to claim 1, the former limit of high frequency transformer adopts Multiple coil, the a certain winding of transformer primary side is connected to after often organizing inverter output end series resonant capacitance, the secondary of high frequency transformer is simplex winding, and the power output of each inverter carries out power combing at secondary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520034781.6U CN204362336U (en) | 2015-01-19 | 2015-01-19 | The high-power high-frequency induction heating power of multi-inverter parallel volume expansion structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520034781.6U CN204362336U (en) | 2015-01-19 | 2015-01-19 | The high-power high-frequency induction heating power of multi-inverter parallel volume expansion structure |
Publications (1)
| Publication Number | Publication Date |
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| CN204362336U true CN204362336U (en) | 2015-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520034781.6U Expired - Fee Related CN204362336U (en) | 2015-01-19 | 2015-01-19 | The high-power high-frequency induction heating power of multi-inverter parallel volume expansion structure |
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| CN (1) | CN204362336U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655788A (en) * | 2016-12-30 | 2017-05-10 | 上海联影医疗科技有限公司 | Resonant converter |
| CN108924980A (en) * | 2018-07-06 | 2018-11-30 | 西安理工大学 | Circuit occurs for any dual-frequency power signal based on voltage superposition principle |
| CN117156620A (en) * | 2023-10-31 | 2023-12-01 | 上海盛迪瓦特电气有限公司 | High-reliability current source type induction heating power supply system and device |
-
2015
- 2015-01-19 CN CN201520034781.6U patent/CN204362336U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655788A (en) * | 2016-12-30 | 2017-05-10 | 上海联影医疗科技有限公司 | Resonant converter |
| CN108924980A (en) * | 2018-07-06 | 2018-11-30 | 西安理工大学 | Circuit occurs for any dual-frequency power signal based on voltage superposition principle |
| CN108924980B (en) * | 2018-07-06 | 2021-06-15 | 西安理工大学 | Arbitrary double-frequency power signal generating circuit based on voltage superposition principle |
| CN117156620A (en) * | 2023-10-31 | 2023-12-01 | 上海盛迪瓦特电气有限公司 | High-reliability current source type induction heating power supply system and device |
| CN117156620B (en) * | 2023-10-31 | 2024-01-30 | 上海盛迪瓦特电气有限公司 | High-reliability current source type induction heating power supply system and device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150527 Termination date: 20160119 |
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| EXPY | Termination of patent right or utility model |