CN101267167A - Voltage increase high-frequency link reverser - Google Patents
Voltage increase high-frequency link reverser Download PDFInfo
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- CN101267167A CN101267167A CNA2008100704292A CN200810070429A CN101267167A CN 101267167 A CN101267167 A CN 101267167A CN A2008100704292 A CNA2008100704292 A CN A2008100704292A CN 200810070429 A CN200810070429 A CN 200810070429A CN 101267167 A CN101267167 A CN 101267167A
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Abstract
The present invention provides a step-up high-frequency link inverter, the circuit structure is composed of an input filter circuit, a dumping inductor, a high-frequency inverter, a high frequency transformer, a frequency current converter, an output filter circuit cascaded in orders, a high frequency electrical isolation fly-back converter energy feedback circuit composed of the frequency current converter, the high frequency energy storage transformer, the rectifier cascaded in orders is connected between the output load and the input DC power, capable of transforming the unstable DC voltage to the needed stable sinusoidal voltage having high grade, the inverter has advantages of high frequency electrical isolation, high output and input voltage matching ability, double-directional power flow, high transforming efficiency, small volume, light weight, small input current ripple, high load adaptability, lower audio noise, high credibility when the load is shortened, lower cost, large output capacity, wide application, establishing a critical technique for the new type inverter and static inverter having large capacity.
Description
Technical field
(Boost) type that boosts high-frequency chain inverter involved in the present invention belongs to the Technics of Power Electronic Conversion technology.
Background technology
Buck (Forward), Boost (single-ended Boost) and Buck-Boost (Flyback) are three kinds of the most frequently used transducer type of fundamental sum, and its performance is as shown in table 1.Table 1 fully shows: Buck (Forward) is though the capacity that converter can be exported is big, defective such as have that the input current ripple is big, transducer reliability is low during load short circuits; Buck-Boost (Flyback) is though there are defectives such as the input current ripple is big, output capacity is little in converter transducer reliability height when load short circuits; Advantage such as Boost (single-ended Boost) converter has that the input current ripple is little, reliability height during load short circuits, the capacity that can export are big.The input current pulsation of Buck (Forward), Buck-Boost (Flyback) converter is big, and its higher harmonic current not only can disturb electronic equipment on every side in the mode of conduction and radiation, and can produce distortion power, reduction conversion efficiency; And the energy storage inductor of Boost (single-ended Boost) converter is positioned at input side, and EMI little, that power supply is produced is little in the pulsation of input current, and the electric current of input side is easy to control.
The performance of table 1Buck (Forward), Boost (single-ended Boost), Buck-Boost (Flyback) converter relatively
Therefore, Boost (single-ended Boost) converter has the two advantage of Buck (Forward), Buck-Boost (Flyback) concurrently, be that the input current ripple is little, reliability height during load short circuits, output capacity are big etc., require that the input current ripple is little, the transformation of electrical energy occasion of reliability height, big capacity output during load short circuits has significant advantage and consequence.
High frequency chain inversion transformation technique, being meant the DC-AC converter technique that has high frequency electrical isolation (more than the 20kHz) between output AC load and input DC power, is the effective way that realizes the security reliability of DC-AC converter output voltage and input voltage coupling, high power density, operation and Electro Magnetic Compatibility etc.The power electronics researcher has obtained significant achievement in research to the research of Buck, each quasi-converter of Buck-Boost type.Yet, people mainly are confined to the DC-DC conversion (as " the A soft-switching active-clamp scheme for isolatedfull-bridge boost converter " of people such as En-Sung Park proposition to the research of Boost code converter, IEEE APEC, 2004, pp.1067～1070.) and AC-DC conversion (" the Novel current-loop feed-forward compensation for boostPFC converter " that proposes as people such as Manjing Xie, IEEE APEC, 2004, pp.750～755.), the research of Boost type high frequency chain DC-AC converter technique is not but seen as yet.
More than discuss and show that the Boost code converter has shown its advantage and brought into play the effect of wanting emphatically in DC-DC, AC-DC transformation of electrical energy field.Advantage how to bring into play the Boost code converter realizes and improves the performance of DC-AC transformation of electrical energy system, is the problem of a very worth further investigation, exploration.Therefore, seek that a class has that the input current ripple is little, reliability height during load short circuits, novel high-frequency chain inverter that output capacity is big be extremely urgent.
Summary of the invention
The present invention seeks to provide a kind of and have that high frequency electrical isolation between output AC load and input DC power, output and input voltage matching capacity are strong, the voltage increase high-frequency link reverser of bidirectional power flow, remarkable advantages such as volume is little, in light weight, conversion efficiency is high, the input current ripple is little, audio noise is low, reliability height during load short circuits, cost is low, output capacity is big, application prospect is extensive.
Of the present invention boosting (Boost) type high-frequency chain inverter is by input filter circuit, energy storage inductor, high-frequency inverter, high frequency transformer, frequency converter, output filter circuit cascade in regular turn constitutes, and between output loading and input DC power, be connected with high frequency electrical isolation inverse excitation type converter energy feedback circuit, described high frequency electrical isolation inverse excitation type converter energy feedback circuit is by frequency converter, the high frequency storage transformer, rectifier cascade in regular turn constitutes, the input of frequency converter is connected with output loading, and the output of rectifier is connected with input DC power.
Technical scheme of the present invention is the performance that the advantage of giving full play to the Boost code converter realized and improved DC-AC transformation of electrical energy system, and (Boost) type high-frequency chain inverter new ideas, circuit structure and topological family have first proposed to boost.
Of the present invention boosting (Boost) type high-frequency chain inverter, a kind of unsettled dc voltage conversion can be become required voltage size, stable high quality sinusoidal voltage, have that high frequency electrical isolation, output and input voltage matching capacity are strong, bidirectional power flow, conversion efficiency height, advantages such as volume is little, in light weight, the input current ripple is little, the adaptive load ability is strong, audio noise is low, reliability height during load short circuits, cost is low, output capacity is big, application prospect is extensive.(Boost) type that boosts high-frequency chain inverter fills the advantage that part has represented the Boost code converter, realizes and improved the performance of DC-AC transformation of electrical energy system.
Description of drawings
Fig. 1 is the boost circuit structure diagram of (Boost) type high-frequency chain inverter of the present invention.
Fig. 2 is (Boost) type high-frequency chain inverter principle oscillogram of boosting.
Fig. 3 is the present invention's (Boost) type high-frequency chain inverter practical circuit one of boosting---recommend the full wave type circuit theory diagrams.
Fig. 4 is the present invention's (Boost) type high-frequency chain inverter practical circuit two---push-pull bridge circuit theory diagrams that boost.
Fig. 5 is the present invention's (Boost) type high-frequency chain inverter practical circuit three---half-bridge full wave type circuit theory diagrams that boost.
Fig. 6 is the present invention's (Boost) type high-frequency chain inverter practical circuit four---half-bridge bridge circuit schematic diagram that boosts.
Fig. 7 is the present invention's (Boost) type high-frequency chain inverter practical circuit five---full-bridge full wave type circuit theory diagrams that boost.
Fig. 8 is the present invention's (Boost) type high-frequency chain inverter practical circuit six---full-bridge bridge circuit schematic diagram that boosts.
Fig. 9 is the boost instantaneous voltage FEEDBACK CONTROL block diagram of (Boost) type high-frequency chain inverter of the present invention.
Figure 10 is an instantaneous voltage feedback control principle oscillogram.
Embodiment
Of the present invention boosting (Boost) type high-frequency chain inverter circuit structure, by input filter circuit, energy storage inductor, high-frequency inverter, high frequency transformer, frequency converter, output filter circuit cascade in regular turn constitutes, and between output loading and input DC power, be connected with high frequency electrical isolation inverse excitation type converter energy feedback circuit, described high frequency electrical isolation inverse excitation type converter energy feedback circuit is by frequency converter, the high frequency storage transformer, rectifier cascade in regular turn constitutes, the input of frequency converter is connected with output loading, and the output of rectifier is connected with input DC power.Described high-frequency chain inverter circuit topology is for recommending full wave type, push-pull bridge, half-bridge full wave type, half-bridge bridge-type, full-bridge full wave type or full-bridge bridge circuit.
Boost (Boost) type high-frequency chain inverter circuit structure and circuit theory waveform respectively as shown in Figure 1 and Figure 2.The absolute value of the low-frequency sinusoidal AC voltages instantaneous value of inverter output at any time | 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|=U
iN
2/ [N
1(1-D)], for different duty ratio D and high frequency transformer turn ratio N
2/ N
1, can obtain greater than, be equal to or less than U
iThe absolute value of output voltage instantaneous value | u
0|.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 higher than input direct voltage U
iWith high frequency transformer turn ratio N
2/ N
1Product (U
iN
2/ N
1), so this class inverter is called (Boost) type high-frequency chain inverter that boosts.High-frequency inverter in this circuit structure, frequency converter are made of two quadrant, four-quadrant high frequency power switch respectively, and energy storage inductor is positioned at the input side of inverter.When input DC power during to load transfer power, high-frequency inverter is modulated into the pulsating direct current electric current of energy storage inductor the high-frequency pulse current of bipolarity three-state, frequency converter is demodulated into the low frequency pulse current of unipolarity three-state again, obtains the low-frequency sinusoidal AC voltages of high-quality behind output filter; When load during to the input DC power feedback energy, frequency converter is modulated into the output low frequency sinusoidal voltage high-frequency pulse voltage of bipolarity three-state, high-frequency inverter is demodulated into the low-frequency pulse voltage of unipolarity three-state again, feeds back to input DC power behind input filter.Because the Boost converter is boost converter in essence, always exist in the cycle in each HF switch | u
0|＞U
iN
2/ N
1So, when the output sinusoidal voltage descend and | u
0|≤U
iN
2/ N
1(t=t in the circuit theory waveform shown in Figure 2 during this time
1～t
2, t
3～t
4Interval) u
0The formation of waveform need realize by increasing a low power high frequency electrical isolation inverse-excitation type Flyback converter energy feedback circuit that is made of frequency converter, high frequency storage transformer, rectifier cascade in regular turn.
The energy storage inductor of (Boost) type high-frequency chain inverter is positioned at input side owing to boost, and the electric current of input side is easy to control, its input current i during the inductive current continuous mode
LBe continuous, the input current pulsating quantity is little, and the electromagnetic interference (EMI) that power supply is produced is little, input dc power stream i
iRipple little.When load short circuits; the energy storage inductor of (Boost) type high-frequency chain inverter can play metering function owing to boost; thereby the climbing of its power switch electric current is constant, the protective circuit of permission is long operate time, so the reliability height of (Boost) type high-frequency chain inverter when load short circuits that boost.Electrical isolation element owing to boost in (Boost) type high-frequency chain inverter is a high frequency transformer, and magnetic core is operated in the bi-directional symmetrical magnetized state, so the power that (Boost) type high-frequency chain inverter that boosts can be exported is big.Therefore, (Boost) type that boosts high-frequency chain inverter require that the mains side ripple is little, the high big capacity transformation of electrical energy occasion of reliability during load short circuits, have significant advantage and consequence.
The embodiment of (Boost) type that boosts high-frequency chain inverter circuit topology family is shown in Fig. 3,4,5,6,7,8.Fig. 3 is for recommending the full wave type circuit, and Fig. 4 is the push-pull bridge circuit, and Fig. 5 is a half-bridge full wave type circuit, and Fig. 6 is the half-bridge bridge circuit, Fig. 7 full-bridge full wave type circuit, and Fig. 8 is the full-bridge bridge circuit.This circuit topology family is applicable to a kind of unsettled direct current is transformed into needed stable high quality sinusoidal ac, can be used to realize having the novel high-power inverter (as 24VDC/220V50HzAC, 48VDC/220V50HzAC) and the static converter (as 27VDC/115V400HzAC, 270VDC/115V400HzAC) of premium properties and wide application prospect.From the input side high-frequency inverter, push-pull type, half bridge circuit high frequency power switch S
1, S
2The maximum voltage stress that bears is the twice (2U that converts the output AC voltage amplitude on former limit
OmN
1/ N
2), the former limit of the former transformer winding utilization is low, and the former limit of latter's transformer winding utilization height; Full bridge circuit high frequency power switch S
1(S
1'), S
2(S
2') the maximum voltage stress that bears is the output AC voltage amplitude (U that converts former limit
OmN
1/ N
2), the former limit of transformer winding utilization height.From the frequency converter of outlet side, full wave type circuit high frequency power switch S
3, S
4The maximum voltage stress that bears is the twice (2U of output AC voltage amplitude
Om), transformer secondary winding utilization is low; Bridge circuit high frequency power switch S
3(S
3'), S
4(S
4') the maximum voltage stress that bears is the amplitude (U of output AC voltage
Om), transformer secondary winding utilization height.Be applicable to low-voltage, high-current, big capacity output inversion occasion so recommend full wave type, half-bridge full wave type, full-bridge full wave type circuit, push-pull bridge, half-bridge bridge-type, full-bridge bridge circuit are applicable to high voltage-small current, big capacity output inversion occasion.
All be provided with a low power high frequency electrical isolation inverse-excitation type Flyback converter energy feedback circuit in this circuit topology family, it is by a four-quadrant power switch S
a, have the centre tapped high frequency storage transformer of a secondary winding T
aWith two unidirectional current power switch (S
A1With D
A1Play a reversed role, S
A2With D
A2Play a reversed role) constitute.Four-quadrant power switch S
aTo export that sinusoidal voltage descends and | u
0|≤U
iN
2/ N
1(t=t in the circuit theory waveform shown in Figure 2 during this time
1～t
2, t
3～t
4The interval) the too much energy of output is modulated into the dither electric current and is stored in high frequency storage transformer T
aIn, work as S
aBy, S
A1Or S
A2During conducting, be stored in high frequency storage transformer T
aIn energy be discharged into the input dc power source.Therefore, the effect of the special small-power high frequency electrical isolation inverse-excitation type Flyback converter that is provided with is, will export sinusoidal voltage decline and | u
0|≤U
iN
2/ N
1Export too much energy during this time and feed back to the input dc power source, guarantee to obtain high-quality output sinusoidal voltage waveform at output.
(Boost) type that boosts high-frequency chain inverter adopts the instantaneous voltage feedback control principle, as Fig. 9 and shown in Figure 10.In this control principle, Fig. 9 is the control principle waveform for control block diagram, Figure 10.At output sinusoidal voltage t=0～t
1, t
2～t
3The interval, the inverter power circuit is in running order, and the energy feedback circuit is in the state of quitting work, control principle can be sketched and be: inverter is exported sinusoidal voltage feedback signal u
OfAbsolute value signal and benchmark sinusoidal signal u
RefAbsolute value signal relatively, behind error amplifier, obtained error amplification signal u
e, this error amplification signal u
eWith sawtooth carrier signal u
cRelatively obtained SPWM signal u
K3, sawtooth carrier signal u
cBehind the trailing edge frequency-halving circuit, obtain pulse signal u
K1, u
K1Obtain pulse signal u through not circuit
K2, SPWM signal u
K3Respectively with pulse signal u
K1, u
K2Mutually or, more respectively with the gating signal u of converter
Sy(u
eObtain through zero-crossing comparator) with, behind drive circuit, obtain four-quadrant high frequency power switch S
1(S
1'), S
2(S
2') drive signal, i.e. S
1(S '
1)=(u
K1+ u
K3) u
Sy, S
2(S '
2)=(u
K2+ u
K3) u
Sy=(u
K1+ u
K3) u
Sy, SPWM signal u
K3Respectively with pulse signal u
K1, u
K2Through or door, signal behind the not circuit respectively as four-quadrant high frequency power switch S
4(S
4') drive signal and four-quadrant high frequency power switch S when the positive and negative half cycle of output voltage
3(S
3') drive signal when the negative, positive half cycle of output voltage, i.e. S
4(S
4')=(u
K3+ u
K1U
K0+ u
K3+ u
K2U
K0) u
Sy, S
3(S
3')=(u
K3+ u
K1U
K0+ u
K3+ u
K2U
K0) u
SyAnd at this interval u
e＞0 ,-u
e＜0 ,-u
eWith u
cDo not have to hand over and cut the gating signal u of converter
Sy=1, u
Sy=0, so power switch S
a, S
A1And S
A2Drive signal all be blocked.At output sinusoidal voltage t=t
1～t
2, t
3～t
4The interval, the inverter power circuit is in the state of quitting work, and the energy feedback circuit is in running order, control principle can be sketched and be: because the gating signal u of converter
Sy=1, u
Sy=0, so four-quadrant high frequency power switch S
1(S
1'), S
2(S
2'), S
3(S
3'), S
4(S
4') drive signal all be blocked; And at this interval u
e＜0 ,-u
e＞0 ,-u
eWith u
cBehind comparator, drive circuit, obtained four-quadrant power switch S
aDrive signal, general-u
eWith u
cThrough comparator, non-behind the door signal and the gating signal u of converter
SyXiang Yuzai selects signal u through the positive and negative half cycle of output voltage
K0, u
K0After obtained S
A1, S
A2Drive signal.Energy feedback circuit duration of work, four-quadrant power switch S
aWith t=t
1～t
2, t
3～t
4The too much energy of interval output is modulated into the dither electric current and is stored in high frequency storage transformer T
aIn, work as S
aBy, S
A1Or S
A2During conducting, be stored in T
aIn energy be discharged into the input dc power source, thereby finished the feedback of output excessive power.
For Fig. 3～shown in Figure 8 recommend, half-bridge, full bridge circuit, the two quadrant high frequency power switch S of input side high-frequency inverter
1(S
1') and S
2(S
2') drive signal differ 180 ° and duty ratio greater than 0.5, at T
sIts common ON time is T in/2
Com=(T
s/ 2) θ/180 ° (Ts ° is the pairing angle of common ON time in HF switch cycle, 0＜θ＜180), duty ratio D=T
Com/ (T
s/ 2)=θ/180 °.By changing the common angle of flow of input side high-frequency inverter, with regard to the ternary high-frequency pulse current i of scalable bipolarity
1The duty ratio D duty ratio of drive signal (change), thereby the stable and adjusting of (Boost) type high-frequency chain inverter output voltage of can realizing when input voltage or load variations, boosting.
Claims (2)
1. voltage increase high-frequency link reverser, it is characterized in that: by input filter circuit, energy storage inductor, high-frequency inverter, high frequency transformer, frequency converter, output filter circuit cascade in regular turn constitutes, and between output loading and input DC power, be connected with high frequency electrical isolation inverse excitation type converter energy feedback circuit, described high frequency electrical isolation inverse excitation type converter energy feedback circuit is by frequency converter, the high frequency storage transformer, rectifier cascade in regular turn constitutes, the input of frequency converter is connected with output loading, and the output of rectifier is connected with input DC power.
2. voltage increase high-frequency link reverser according to claim 1 is characterized in that: described high-frequency chain inverter circuit topology is for recommending full wave type, push-pull bridge, half-bridge full wave type, half-bridge bridge-type, full-bridge full wave type or full-bridge bridge circuit.
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