CN101414791A - Differential decompression DC chopper type high-frequency chain inverter - Google Patents
Differential decompression DC chopper type high-frequency chain inverter Download PDFInfo
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- CN101414791A CN101414791A CNA2008100722661A CN200810072266A CN101414791A CN 101414791 A CN101414791 A CN 101414791A CN A2008100722661 A CNA2008100722661 A CN A2008100722661A CN 200810072266 A CN200810072266 A CN 200810072266A CN 101414791 A CN101414791 A CN 101414791A
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Abstract
The invention relates to a differential buck direct current chopper type high frequency link inverter which is provided with a circuit consisting of two same high frequency electric insulation bidirectional buck direct current choppers which output low frequency positive half cycle unipolar sine pulse width modulating voltage wave and low frequency negative half cycle unipolar sine pulse width modulating voltage wave respectively in the form of differential circuits. LC filters are connected between an output end of a differential chopper and an output load and between an input direct current power supply and an input end of the differential chopper. The high frequency link inverter can transform an unstable direct current voltage into a required stable good-quality sine alternating current voltage, the high frequency link inverter has the advantages of high frequency electric isolation, strong matching ability of input voltage and output voltage, simple circuit topology, single stage power transformation, bidirectional power flow, high power density, high transformation efficiency, less output voltage ripple, strong load adaptability, low audio frequency noise, low cost, wide application prospects and the like and provides the key technology for a novel inverter power supply and a static convertor.
Description
Technical field
Differential decompression involved in the present invention (Buck) DC chopper type high-frequency chain inverter belongs to the Technics of Power Electronic Conversion technical field.
Background technology
To be the applied power semiconductor device be transformed into a kind of static ac dc converter device of alternating current with direct current with inverter, uses for AC load.The inverter of high frequency electrical isolation is arranged between output AC load and input DC power, be called high-frequency chain inverter.The high frequency electrical isolation element has mainly played following effect in inverter: 1) realized the electrical isolation between inverter output and the input, improved the security reliability and the Electro Magnetic Compatibility of invertor operation; 2) realized coupling between inverter output voltage and the input voltage, realized promptly that the output voltage of inverter can be higher than, be equal to or less than the technique effect of input direct voltage that its range of application has obtained widening greatly; 3) operating frequency of high frequency transformer or high frequency storage transformer is more than 20kHz, and its volume, weight and audio noise greatly reduce, and has overcome the defective of low frequency chain inverter effectively.Therefore, it with DC generator, storage battery, solar cell and fuel cell the inversion occasion of main dc power supply, high-frequency chain inverter is with a wide range of applications, and is particularly having the inversion occasion of high request that prior using value is arranged to volume and weight.
High-frequency chain inverter is normally formed by high frequency electrical isolation DC-DC converter and the cascade of inverter bridge two-stage circuit structure, electric energy has passed through Two Stages (DC-to-DC-low-frequency ac), and its conversion efficiency (product of high frequency electrical isolation DC-DC transducer effciency and inverter bridge efficient) must be lower than the efficient of single-stage high frequency electrical isolation DC-DC converter.Thus, the conversion efficiency of high-frequency chain inverter is unsatisfactory, and its basic reason is the two-stage circuit structure that it belongs to cascade.
Step-down (Buck) DC chopper normally is used for becoming mean value to be lower than the high frequency pulse dc voltage of input voltage a kind of dc voltage conversion.If the output in step-down (Buck) DC chopper is connected to the LC filter, just constituted no electrical isolation or high frequency electrical isolation step-down (Buck) DC converter, its transformation of electrical energy efficient is usually up to more than 90%.It is so high why the transformation of electrical energy efficient of step-down (Buck) DC chopper or converter can reach, and main cause is that it belongs to the single-level circuit structure.
Therefore, the high-frequency chain inverter of seeking a class single-level circuit structure (single-stage power conversion) is extremely urgent, for conversion efficiency, power density, the reliability of effective raising high-frequency chain inverter with reduce cost and will have crucial meaning.
Summary of the invention
The present invention seeks to provide a kind of differential decompression DC chopper type high-frequency chain inverter with advantages such as high frequency electrical isolation between output AC load and input DC power, output and input voltage matching capacity are strong, circuit topology succinct, single-stage power conversion, bidirectional power flow, power density height, conversion efficiency height, output voltage ripple are little, the adaptive load ability is strong, audio noise is low, cost is low, application prospect is extensive.
Differential decompression of the present invention (Buck) DC chopper type high-frequency chain inverter, constitute with differential circuit by two high frequency electrical isolation two-way step down DC choppers identical, the positive and negative half cycle unipolarity of output low frequency sinusoidal pulse width modulation voltage wave respectively, and between the output and output loading of differential chopper, all be connected to the LC filter between the input of input DC power and differential chopper, described each high frequency electrical isolation two-way step down DC chopper constitutes by the cascade in regular turn of high-frequency inverter, high frequency transformer, hf rectifier.
The present invention is with the cascade circuit structure of 2 stage converter in traditional high-frequency chain inverter, become the differential circuit structure of two single-stage high frequency electrical isolation two-way step downs (Buck) DC chopper, proposed differential decompression (Buck) DC chopper type high-frequency chain inverter new ideas, circuit structure and topological family first.
Differential decompression of the present invention (Buck) DC chopper type high-frequency chain inverter, a kind of unsettled dc voltage conversion can be become required voltage size, stable high quality sinusoidal voltage, have advantages such as high frequency electrical isolation, output and input voltage matching capacity are strong, circuit topology succinct, single-stage power conversion (direct current-low-frequency ac), bidirectional power flow, power density height, conversion efficiency height, output voltage ripple is little, the adaptive load ability is strong, audio noise is low, cost is low, application prospect is extensive.The performance of differential decompression (Buck) DC chopper type high-frequency chain inverter will be more superior than the high-frequency chain inverter of traditional 2 stage converter cascade circuit structure.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is the circuit structure diagram of the embodiment of the invention.
Fig. 3 is a principle of the invention oscillogram.
Fig. 4 is a circuit topology example one of the present invention---single tube positive activation type circuit theory diagrams.
Fig. 5 is circuit topology example two of the present invention---a push-pull circuit schematic diagram.
Fig. 6 is a circuit topology example three of the present invention---push-pull ortho-exciting formula circuit theory diagrams.
Fig. 7 is a circuit topology example four of the present invention---double tube positive exciting formula circuit theory diagrams.
Fig. 8 is circuit topology example five of the present invention---a half bridge circuit schematic diagram.
Fig. 9 is circuit topology example six of the present invention---a full bridge circuit schematic diagram.
Figure 10 is an instantaneous voltage FEEDBACK CONTROL block diagram of the present invention.
Figure 11 is an instantaneous voltage feedback control principle oscillogram of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described further.
Differential decompression of the present invention (Buck) DC chopper type high-frequency chain inverter circuit structure, identical by two, output low frequency just respectively, high frequency electrical isolation two-way step down (Buck) DC chopper of negative half period unipolarity sinusoidal pulse width modulation voltage wave constitutes with differential circuit, and between the output and output loading of differential chopper, all be connected to the LC filter between the input of input DC power and differential chopper, described each high frequency electrical isolation two-way step down (Buck) DC chopper is by high-frequency inverter, high frequency transformer, hf rectifier cascade in regular turn constitutes.
Differential decompression (Buck) DC chopper type high-frequency chain inverter theory diagram, circuit structure and circuit theory waveform are respectively as shown in Figure 1, 2, 3.Because the positive and negative half cycle unipolarity of the low frequency sinusoidal pulse width modulation voltage wave u that high frequency electrical isolation bidirectional power flow Buck DC chopper I, II export respectively
O1And u
O2At the mean value of any one HF switch in the cycle, be the absolute value of the low-frequency sinusoidal AC voltages instantaneous value of this moment inverter output | u
0|, thereby | u
0| with input direct voltage U
i, high frequency transformer turn ratio N
2/ N
1, the pass between the duty ratio D be | u
0|=DU
iN
2/ N
1, | u
0| at different duty ratio D and high frequency transformer turn ratio N
2/ N
1The time can greater than, be equal to or less than U
iSo, high frequency transformer in this class inverter circuit structure has not only played security reliability and the Electro Magnetic Compatibility that improves invertor operation, the more important thing is the effect of having played matched output voltage and input voltage, realized that promptly the output voltage of inverter is higher than, be equal to or less than input direct voltage U
iTechnique effect, its range of application has obtained widening greatly.Because 0＜D＜1, so | u
0|＜U
iN
2/ N
1, that is to say the absolute value of the low-frequency sinusoidal AC voltages instantaneous value of the output of inverter at any time | u
0| always be lower than input direct voltage U
iWith high frequency transformer turn ratio N
2/ N
tProduct (U
iN
2/ N
1), so this class inverter is called step-down (Buck) DC chopper type high-frequency chain inverter.High-frequency inverter in this circuit structure is made of one or more two quadrant high frequency power switches, and hf rectifier is made of with two quadrant high frequency power switches with two quadrant high frequency power switches and an afterflow one or two rectification.In a low frequency output voltage cycle, high frequency electrical isolation bidirectional power flow Buck DC chopper I and II be the unipolarity sinusoidal pulse width modulation voltage wave u of the positive and negative half cycle of output low frequency respectively
O1And u
O2, u
O1And u
O2Behind the LC filter at AC load Z
LThe low-frequency sinusoidal AC voltages u of last outputting high quality
oThat is to say unipolarity sinusoidal pulse width modulation voltage wave u when the positive half cycle of DC chopper I work output low frequency
O1, and DC chopper II quits work and afterflow with two quadrant power switch conductings, u
O2=0, output sinusoidal voltage u behind the LC filter
0Positive half cycle; Otherwise, as the unipolarity sinusoidal pulse width modulation voltage wave u of DC chopper II work output low frequency negative half period
O2, and DC chopper I quits work and afterflow with two quadrant power switch conductings, u
O1=0, output sinusoidal voltage u behind the LC filter
0Negative half period.
When power supply to load transfer power (u
0* i
Lf0) time, high-frequency inverter is reverse into bipolarity binary states or ternary high-frequency ac pulse voltage with input direct voltage Ui, through high frequency transformer T
1, T
2After electrical isolation, transmission and the voltage matches, hf rectifier is with high-frequency ac pulse voltage u
12, u
22Be rectified into the high frequency dc pulse voltage u of ternary sinusoidal pulse width modulation
O1And u
O2, u
O1And u
O2Behind output LC filter at AC load Z
LThe low-frequency sinusoidal AC voltages u of last outputting high quality
o, input high-frequency pulse current i
I1, i
I2Behind input filter, obtained level and smooth input dc power stream i
iWhen load to power supply feedback energy (u
0* i
Lf＜0) time, hf rectifier is operated in inverter mode, and high-frequency inverter is operated in rectification state.
Differential decompression of the present invention (Buck) DC chopper type high-frequency chain inverter, have only a high frequency electrical isolation bidirectional power flow Buck DC chopper in running order at any time, the high-frequency chain inverter that belongs to the single-level circuit structure exists important difference with the circuit structure of 2 stage converter cascade.Therefore, inverter of the present invention is creative, have conversion efficiency height (meaning that energy loss is little), power density height (mean volume, weight little), advantage such as cost is low, application prospect is extensive, build today energy-saving, conservation-minded society vigorously advocating, have more important value.
Differential decompression (Buck) the DC chopper type high-frequency chain inverter circuit topology embodiment of family is shown in Fig. 4,5,6,7,8,9.Fig. 4 is a single tube positive activation type circuit, the R among Fig. 4
C1, C
C1, D
C1And R
C2, C
C2, D
C2Constitute the clamp circuit of chopper 1,2 respectively, be used to realize high frequency transformer T
1, T
2Magnetic reset and suppress the shutoff voltage spike of high frequency power switch; Fig. 5 is a push-pull circuit, and Fig. 6 is a push-pull ortho-exciting formula circuit, and Fig. 7 is a double tube positive exciting formula circuit, and Fig. 8 is a half bridge circuit, and Fig. 9 is a full bridge circuit.The voltage stress that single tube positive activation type, push-pull type, push-pull ortho-exciting formula circuit input inversion side high frequency power switch bear is the twice input direct voltage, is applicable to low pressure input inversion occasion; The voltage stress that double tube positive exciting formula, semibridge system, full bridge circuit input inversion side high frequency power switch bear is a single times of input direct voltage, is applicable to high pressure input inversion occasion.Single tube positive activation type, double tube positive exciting formula circuit are applicable to small-power inversion occasion, and half bridge circuit is applicable to middle power inverting occasion, and push-pull type, push-pull ortho-exciting formula, full bridge circuit are applicable to the high power contravariant occasion.This circuit topology family is applicable to a kind of unsettled direct current is transformed into needed stable high quality sinusoidal ac, can be widely used in the inverter (as communication inverter 48VDC/220V50HzAC, 24VDC/220V50HzAC) of the civil area of different input and output voltages, different capabilities and the inverter (as Aviation Static Inverter 27VDC/115V400HzAC, 270VDC/115V400HzAC) in national defence field etc.
Differential decompression (Buck) DC chopper type high-frequency chain inverter adopts the instantaneous voltage feedback control strategy, and its control block diagram and control principle waveform are respectively shown in Figure 10,11.Sinusoidal voltage u with inverter output
oWith benchmark sinusoidal voltage u
rCompare, its error voltage has obtained error voltage amplifying signal u behind proportional and integral controller
e, the absolute value signal of the error voltage that this has amplified | u
e| with zigzag carrier wave u
cHand over and cut, obtained SPWM signal u
K1With SPWM signal u
K1With output sinusoidal ac positive pressure half cycle signal u
SyWith signal respectively with zigzag carrier wave u
cTrailing edge two divided-frequency signal u
kAnd reverse signal u
kWith and behind drive circuit, just obtained power switch S
11(S
11') and S
13, S
12(S
12') and S
14Drive signal, these two groups of drive signals have just obtained power switch S through OR-NOT circuit and behind drive circuit
15Drive signal; In like manner, with SPWM signal u
K1With output sinusoidal voltage negative half-cycle signal u
SyWith signal respectively with zigzag carrier wave u
cTrailing edge two divided-frequency signal u
kAnd reverse signal u
kWith and behind drive circuit, just obtained power switch S
21(S
21') and S
23, S
22(S
22') and S
24Drive signal, these two groups of drive signals have just obtained power switch S through OR-NOT circuit and behind drive circuit
25Drive signal.High frequency electrical isolation bidirectional power flow Buck DC chopper I, II be the unipolarity sinusoidal pulse width modulation voltage wave u of the positive and negative half cycle of output low frequency respectively
O1And u
O2, behind output LC filter at load Z
LOn just obtained high-quality low-frequency sinusoidal AC voltages u
oTherefore, when input voltage or load variations, by regulating benchmark sinusoidal voltage u
rAmplitude, promptly regulated the error voltage absolute value signal | u
e| amplitude change modulation degree m (m=u
rAmplitude/carrier wave u
cAmplitude), just can realize the stable of differential decompression (Buck) DC chopper type high-frequency chain inverter output voltage and regulate.
What need supplementary notes is, when single tube positive activation type shown in Fig. 4,7, double tube positive exciting formula differential decompression (Buck) DC chopper type high-frequency chain inverter adopt controlling schemes shown in Figure 10,11, can simplify this controlling schemes, can omit S
12(S
12') and S
14, S
22(S
22') and S
24Two groups of drive signals, thus power switch S made
15, S
25Drive signal can be respectively by S
11(S
11') and S
13, S
21(S
21') and S
23The anti-phase of drive signal obtains.
Claims (2)
1, a kind of differential decompression DC chopper type high-frequency chain inverter, it is characterized in that: this inverter is identical by two, output low frequency just respectively, the high frequency electrical isolation two-way step down DC chopper of negative half period unipolarity sinusoidal pulse width modulation voltage wave constitutes with differential circuit, and between the output and output loading of differential chopper, all be connected to the LC filter between the input of input DC power and differential chopper, described each high frequency electrical isolation two-way step down DC chopper is by high-frequency inverter, high frequency transformer, hf rectifier cascade in regular turn constitutes.
2, differential decompression DC chopper type high-frequency chain inverter according to claim 1 is characterized in that: described high-frequency chain inverter circuit topology is circuit such as single tube positive activation type, push-pull type, push-pull ortho-exciting formula, double tube positive exciting formula, semibridge system, full-bridge type.
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| CN200810072266.1A CN101414791B (en) | 2008-12-02 | 2008-12-02 | Differential decompression DC chopper type high-frequency chain inverter |
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| CN101414791B CN101414791B (en) | 2014-03-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118050A (en) * | 2011-02-28 | 2011-07-06 | 中国船舶重工集团公司第七一二研究所 | Storage battery charge-discharge device |
| CN103683951A (en) * | 2013-11-21 | 2014-03-26 | 浙江大学 | Inverter with full-wave differential output function |
| CN103684024A (en) * | 2013-11-21 | 2014-03-26 | 浙江大学 | Inverter of current doubling differential output structure |
| CN109268563A (en) * | 2018-10-09 | 2019-01-25 | 北京大豪科技股份有限公司 | Air valve driving circuit, air valve drive control method and apparatus |
| CN112242791A (en) * | 2019-07-16 | 2021-01-19 | Abb瑞士股份有限公司 | Transformer assembly with intermediate frequency transformer |
-
2008
- 2008-12-02 CN CN200810072266.1A patent/CN101414791B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102118050A (en) * | 2011-02-28 | 2011-07-06 | 中国船舶重工集团公司第七一二研究所 | Storage battery charge-discharge device |
| CN103683951A (en) * | 2013-11-21 | 2014-03-26 | 浙江大学 | Inverter with full-wave differential output function |
| CN103684024A (en) * | 2013-11-21 | 2014-03-26 | 浙江大学 | Inverter of current doubling differential output structure |
| CN103683951B (en) * | 2013-11-21 | 2016-04-27 | 浙江大学 | A kind of inverter of full wave type difference output |
| CN103684024B (en) * | 2013-11-21 | 2016-04-27 | 浙江大学 | The inverter of a kind of times of streaming difference output |
| CN109268563A (en) * | 2018-10-09 | 2019-01-25 | 北京大豪科技股份有限公司 | Air valve driving circuit, air valve drive control method and apparatus |
| CN112242791A (en) * | 2019-07-16 | 2021-01-19 | Abb瑞士股份有限公司 | Transformer assembly with intermediate frequency transformer |
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| CN101414791B (en) | 2014-03-26 |
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