CN105099214A - Single-stage step-up inverter - Google Patents
Single-stage step-up inverter Download PDFInfo
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- CN105099214A CN105099214A CN201410186142.1A CN201410186142A CN105099214A CN 105099214 A CN105099214 A CN 105099214A CN 201410186142 A CN201410186142 A CN 201410186142A CN 105099214 A CN105099214 A CN 105099214A
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Abstract
The invention discloses a single-stage step-up inverter, which comprises an input rectification circuit, a pi-type circuit and an inverter circuit, wherein the input rectification circuit is connected with external AC; the pi-type circuit is connected with the input rectification circuit and the inverter circuit, and the inverter circuit is connected with an external load; the pi-type circuit comprises a first capacitor, a second capacitor and an inductor; the first capacitor and the second capacitor are in parallel connection; the inductor is connected onto a parallel loop of the first capacitor and the second capacitor; the first capacitor is in parallel connection with the input rectification circuit; the second capacitor is in parallel connection with the inverter circuit; the input rectification circuit is used for rectifying the external AC into DC pulsating voltage; when the DC pulsating voltage is higher than a voltage limit value, the pi-type circuit is used for DC filter; and when the DC pulsating voltage is lower than the voltage limit value, part of or all of bridge arms in the inverter circuit are adjusted to be in a shoot-through state, and the inductor in the pi-type circuit is charged, and after the shoot-through state is over, inductive voltage generated by the inductor is overlapped with the DC pulsating voltage and then outputted to the inverter circuit.
Description
Technical field
The present invention relates to a kind of motor-drive circuit, espespecially a kind of novel single stage type booster type inverter, can be applicable to drive motors load.
Background technology
In the motor-drive circuit of prior art, the inverter circuit utilized mainly contains following two kinds of modes: as shown in Figure 1, first kind of way adopts two-layer configuration, prime adopts boost circuit raises direct voltage, and realize High Power Factor and the low harmonic current of input power side, this mode two-stage circuit is control inputs and output performance respectively, realizes the decoupling zero of input and output.
As shown in Figure 2, another kind of mode adopts low-capacitance electric capacity in DC side, and direct voltage is with input voltage fluctuation, and power output and torque are also along with input voltage fluctuation, and this mode adopts power tracking mode, make power output with input voltage fluctuation.
First kind of way can obtain good input and output effect, but adopts two-layer configuration, and circuit cost increases.Second way inverter input and output performance affects by direct current capacitance.Direct current capacitance is larger, and input power is lower, and export speed adjustable range wider, otherwise direct current capacitance is less, input power factor is lower, exports speed adjustable range narrower.
Summary of the invention
For the deficiency of above-mentioned two kinds of booster type inverters, the present invention proposes a kind of by rectification circuit, the single stage type booster type inverter of pi-network and inverter circuit cascade, overcomes the problem that cost in prior art is higher, output effect is not good.
In the present invention, the AC rectification of input is DC pulse moving voltage by input rectification circuit.Pi-network both can as DC filtering circuit, again can as the work of boosting accumulator.Inverter circuit can output AC voltage, and supply motor load, can help again the inductive energy storage of pi-network, realizes boosting.
For achieving the above object, the present invention proposes a kind of single stage type booster type inverter, comprising: input rectification circuit, pi-network and inverter circuit; Described input rectification circuit access external communication electricity, described pi-network connects described input rectification circuit and described inverter circuit, and described inverter circuit connects an external loading; Wherein, described pi-network comprises: the first electric capacity, the second electric capacity and an inductance; Described first electric capacity and the second electric capacity are in parallel, and described inductance is connected on the shunt circuit of described first electric capacity and the second electric capacity; Described first electric capacity is in parallel with described input rectification circuit, and described second electric capacity is in parallel with described inverter circuit; It is DC pulse moving voltage that described input rectification circuit is used for described external communication electric rectification; When the voltage limits that described DC pulse moving voltage normally works required higher than described external loading, described pi-network is used for DC filtering, and described inverter circuit inversion exports an alternating voltage to described external loading; When the voltage limits that described DC pulse moving voltage normally works required lower than described external loading, part or all of brachium pontis in described inverter circuit is regulated to be pass-through state, inductance in described pi-network is charged, after pass-through state terminates, described inductance generates induced voltage and exports described inverter circuit to after superposing with described DC pulse moving voltage, and described inverter circuit inversion exports an alternating voltage to described external loading.
Single stage type booster type inverter of the present invention adopts single stage type circuit realiration DC boosting and input power factor to regulate, and adopts pi-network, has both realized DC filtering function, realize again DC boosting function in the DC circuit between rectification circuit and inverter circuit; The control strategy of inverter circuit also add the control of straight-through voltage vector on Space Voltage Vector Control Strategy, assists the inductive energy storage in DC side π type filter circuit, makes dc voltage boost.Not only reduce circuit cost by single stage type booster type inverter of the present invention, also achieve High Power Factor and the low harmonic current content of input, make motor load have wider speed adjustable range simultaneously, reach preferably output effect.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms a application's part, does not form limitation of the invention.In the accompanying drawings:
Fig. 1 is the circuit diagram of a kind of inverter of the prior art.
Fig. 2 is the circuit diagram of another kind of inverter of the prior art.
Fig. 3 is the circuit diagram of the single stage type booster type inverter of one embodiment of the invention.
Fig. 4 is the schematic diagram of change in voltage in the circuit of one embodiment of the invention.
Fig. 5 is the circuit working state figure in the pattern I a certain moment of the present invention one specific embodiment.
Fig. 6 is the schematic diagram of a certain inverter bridge leg drive singal in the pattern I of the present invention one specific embodiment.
Fig. 7 is the circuit working state figure in a certain moment when charging in the pattern II of the present invention one specific embodiment.
Fig. 8 is the schematic diagram of a certain inverter bridge leg drive singal in the pattern II of the present invention one specific embodiment.
Fig. 9 is the waveform schematic diagram of AC-input voltage and electric current in the circuit of the present invention one specific embodiment.
Embodiment
Below coordinating preferred embodiment graphic and of the present invention, setting forth the technological means that the present invention takes for reaching predetermined goal of the invention further.
Fig. 3 is the circuit diagram of the single stage type booster type inverter of one embodiment of the invention.As shown in Figure 3, this circuit comprises: input rectification circuit 1, pi-network 2 and inverter circuit 3; Input rectification circuit 1 accesses external communication electricity 4, and pi-network 2 connects input rectification circuit 1 and inverter circuit 3, and inverter circuit 3 connects an external loading 5; Wherein,
Pi-network 2 comprises: the first electric capacity C1, the second electric capacity C2 and an inductance L
dc; First electric capacity C1 and the second electric capacity C2 is in parallel, inductance L
dcbe connected on the shunt circuit of the first electric capacity C1 and the second electric capacity C2;
First electric capacity C1 is in parallel with input rectification circuit 1, and the second electric capacity C2 is in parallel with inverter circuit 3.
Wherein, input rectification circuit 1 for by external communication electricity 4 rectifications be DC pulse moving voltage; Inverter circuit 3 is for exporting to external loading 5 by the voltage inversion of direct-flow input end.
In the present embodiment, inverter circuit 3 can be three-phase inverting circuit, full bridge inverter, half-bridge inversion circuit, four bridge legs inverter circuit, multi-phase inverter circuit one of them.External communication electricity 4 can be 220V alternating current.External loading 5 can be motor load.
Again shown in composition graphs 4, Fig. 4 is the schematic diagram of change in voltage in the circuit of one embodiment of the invention.
Comprise in the diagram: the DC pulse moving voltage U after input rectification circuit 1 rectification
rec, inverter circuit direct-flow input end voltage U
dcwith direct current threshold voltage U
thwaveform.Wherein, direct current threshold voltage U
thit is the minimum voltage ensureing that inverter circuit 3 normally exports.If the voltage U of inverter circuit direct-flow input end
dcbe less than direct current threshold voltage U th, then inverter circuit normally cannot export enough alternating voltage drive motors loads, and motor load cannot normally run; Therefore, the voltage U to inverter circuit direct-flow input end is just needed
dcboost, to ensure that inverter circuit normally works.
In the present embodiment, the voltage U of inverter circuit direct-flow input end is affected
dcthe mainly DC pulse moving voltage U of change
rec, so according to DC pulse moving voltage U
recwith direct current threshold voltage U
thmagnitude relationship, two kinds can be divided into the mode of operation of circuit:
1, as DC pulse moving voltage U
rechigher than direct current threshold voltage U
thtime, circuit is in pattern I;
In pattern I, the diode complementary conducting in input rectification circuit 1, the DC pulse moving voltage U after rectification
recafter pi-network 2 filtering high order harmonic component, supply inverter circuit 3, inverter circuit 3 exports an alternating current and drives external loading 5.In such a mode, the switching tube in inverter circuit 3 is operated in complementary state, and namely each inverter bridge leg has at most a switching tube conducting.
2, as DC pulse moving voltage U
reclower than direct current threshold voltage U
thtime, circuit is in pattern II.
In pattern II, the diode complementary conducting in input rectification circuit 1, the DC pulse moving voltage U after rectification
reclower than direct current threshold voltage U
th, the normal output of inverter circuit 3 cannot be ensured.Therefore in the operating state of inverter circuit 3, add straight-through operating state, be both inductive energy storage, and made continuous input current again.After pass-through state terminates, the fault offset in DC inductance, maintains inductive current constant, makes the voltage U of inverter circuit direct-flow input end
dcraise (as shown in pattern II part in Fig. 4).U after rising
dchigher than threshold voltage U
th, ensure the normal output of inverter circuit.Wherein, when straight-through work, inverter circuit has whole switching tube conductings of a brachium pontis at least.
In order to more clearly explain above-mentioned two kinds of patterns, below in conjunction with Fig. 5 to Fig. 8, be described by two kinds of mode of operations of multiple specific embodiment to single stage type booster type inverter of the present invention.
Fig. 5 is the circuit working state figure in the pattern I a certain moment of the present invention one specific embodiment.As shown in Figure 5, diode D1, D4 conducting, becomes direct current by input AC electric rectification.High order harmonic component in pi-network 3 filtering circuit, supply inverter circuit direct-flow input end, the therefore voltage U of inverter circuit direct-flow input end
dcwith DC pulse moving voltage U
recapproximately equal (as shown in pattern I part in Fig. 4).
In this specific embodiment, switching tube Q1, Q4, Q6 conducting of inverter circuit 3.The complementary conducting of each brachium pontis, wherein the drive singal of Q1, Q2 as shown in Figure 6, inserts dead band state in Q1, Q2 drive singal, prevents switching over state from causing bridge arm direct pass short circuit.
Fig. 7 is the circuit working state figure in a certain moment when charging in the pattern II of the present invention one specific embodiment.As shown in Figure 7, diode D1, D4 conducting, becomes direct current by input AC electric rectification.Switching tube Q1, Q2 conducting of inverter circuit 3, the inductive energy storage in pi-network, inductance i
dccurrent expression is:
Wherein, I
dcfor the electric current of described inductance;
L
dcfor the inductance of described inductance;
U
recfor the voltage of the output of described input rectification circuit;
T is the charging interval of described inductance;
I
0for the initial current of described inductance.
After pass-through state terminates, inductive current, in order to keep continuous, induces high voltage at inductance two ends, with DC pulse moving voltage U
reccommon supply inverter bridge input side after superposition.Thus achieve the lifting of voltage.
Now, the voltage U of inverter circuit direct-flow input end
dcfor:
Wherein, U
dcfor the voltage of the direct-flow input end of described inverter circuit;
U
recfor the voltage of the output of described input rectification circuit;
L
dcfor the inductance of described inductance;
I
dcfor the induced current of described inductance;
T is the charging interval of described inductance.
In this specific embodiment, Fig. 8 is the drive singal of switching tube Q1, Q2 in inverter circuit 3 on a brachium pontis.In two drive singal, insert pass-through state, be DC inductance energy storage state; Other time be inverter mode.
If the switch periods of inverter circuit is T
s, the pass-through state time in a switch periods is T
0, then DC voltage is:
U
dcfor the voltage of the direct-flow input end of described inverter circuit;
U
recfor the voltage of the output of described input rectification circuit;
T
sfor the switch periods of described inverter circuit switching device;
T
0for the time of described pass-through state.
From above-mentioned formula (3) formula, by regulating the time T of pass-through state
0, i.e. the voltage U of adjustable different inverter circuit direct-flow input end
dc.
In the embodiment described in earlier figures 3 to Fig. 8, electric capacity C1 and C2 is used for filtering and suppresses high frequency voltage spike, and its capacitance is less.When working in pattern II, the inductance in pi-network 2 makes input current still can be continuous when comparatively low input, thus improves the power factor of input, reduces the harmonic content of input current.
In actual applications, following circuit parameter can being selected: with the present invention to drive 1.5kw permagnetic synchronous motor, when emulating, can L being set
dc=0.7mH, C1=2uF, C2=2uF.When single-phase 220V exchanges input, motor speed can be realized and reach 5200rpm, export average torque 3Nm, PF>0.97, Po>1250W.
Fig. 9 is the waveform schematic diagram of AC-input voltage and electric current in the circuit of the present invention one specific embodiment.Because inverter circuit works in two kinds of patterns, input current is not identical under each pattern yet.Electric capacity C1 and electric capacity C2 is used for filtering and suppresses high frequency voltage spike, its capacitance is less, system works in pattern II time, inductance in pi-network makes input current still can be continuous when comparatively low input, thus make input have high power factor, and lower harmonic current content, power factor and the current harmonic content of input side can be improved by single stage type booster type inverter of the present invention.
The control effects that the single stage type booster type inverter that the present invention proposes adopts unique circuit topology and control strategy to make input side and outlet side reach desirable.Wherein, control strategy comprises two kinds of mode of operations.When direct voltage is higher than threshold voltage, inverter can export normal power; When direct voltage is lower than threshold voltage, inverter can not export required power; When pattern I is applied to direct voltage higher than threshold voltage, pi-network uses as DC filtering circuit, and inverter is according to Frequency conversion control work pattern.When pattern II is applied to direct voltage lower than threshold voltage, the inductance in pi-network uses as the inductance of boost circuit, energy storage and can promote the input voltage of inverter circuit, thus makes inverter circuit export enough power drive machine operation.In pattern II, the zero vector in the voltage control vector of inverter circuit replaces by leading directly to vector, both ensure that output effect like this, provides energy storage path also to the inductance of pi-network simultaneously.By the complex controll mode be made up of these two kinds of patterns, DC voltage is improved, reach the requirement that inverter exports driven motor.
Single stage type booster type inverter of the present invention adopts single stage type circuit realiration DC boosting and input power factor to regulate, and adopts pi-network, has both realized DC filtering function, realize again DC boosting function in the DC circuit between rectification circuit and inverter circuit; The control strategy of inverter circuit also add the control of straight-through voltage vector on Space Voltage Vector Control Strategy, assists the inductive energy storage in DC side π type filter circuit, makes dc voltage boost.Not only reduce circuit cost by single stage type booster type inverter of the present invention, also achieve High Power Factor and the low harmonic current content of input, make motor load have wider speed adjustable range simultaneously, reach preferably output effect.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a single stage type booster type inverter, is characterized in that, comprising: input rectification circuit, pi-network and inverter circuit; Described input rectification circuit access external communication electricity, described pi-network connects described input rectification circuit and described inverter circuit, and described inverter circuit connects an external loading; Wherein,
Described pi-network comprises: the first electric capacity, the second electric capacity and an inductance; Described first electric capacity and the second electric capacity are in parallel, and described inductance is connected on the shunt circuit of described first electric capacity and the second electric capacity;
Described first electric capacity is in parallel with described input rectification circuit, and described second electric capacity is in parallel with described inverter circuit;
It is DC pulse moving voltage that described input rectification circuit is used for described external communication electric rectification;
When the voltage limits that described DC pulse moving voltage normally works required higher than described external loading, described pi-network is used for DC filtering, and described inverter circuit inversion exports an alternating voltage to described external loading;
When the voltage limits that described DC pulse moving voltage normally works required lower than described external loading, part or all of brachium pontis in described inverter circuit is regulated to be pass-through state, inductance in described pi-network is charged, after pass-through state terminates, described inductance generates induced voltage and exports described inverter circuit to after superposing with described DC pulse moving voltage, and described inverter circuit inversion exports an alternating voltage to described external loading.
2. single stage type booster type inverter according to claim 1, it is characterized in that, described inverter circuit at least comprises: one of them of three-phase inverting circuit, full bridge inverter, half-bridge inversion circuit, four bridge legs inverter circuit, multi-phase inverter circuit.
3. single stage type booster type inverter according to claim 1, it is characterized in that, when the voltage limits that described DC pulse moving voltage normally works required higher than described external loading, described pi-network is used for DC filtering, high order harmonic component in filtering circuit, and the direct-flow input end described DC pulse moving voltage being exported to described inverter circuit.
4. single stage type booster type inverter according to claim 1, it is characterized in that, when the voltage limits that described DC pulse moving voltage normally works required lower than described external loading, part or all of brachium pontis in described inverter circuit is regulated to be pass-through state, inductance in described pi-network is charged, wherein, the induced current expression formula of described inductance is:
Wherein, I
dcfor the electric current of described inductance;
L
dcfor the inductance of described inductance;
U
recfor the voltage of the output of described input rectification circuit;
T is the charging interval of described inductance;
I
0for the initial current of described inductance.
5. single stage type booster type inverter according to claim 4, it is characterized in that, after described pass-through state terminates, described inductance generates induced voltage and exports described inverter circuit to after superposing with described DC pulse moving voltage, and the voltage of the direct-flow input end of described inverter circuit is:
Wherein, U
dcfor the voltage of the direct-flow input end of described inverter circuit;
U
recfor the voltage of the output of described input rectification circuit;
L
dcfor the inductance of described inductance;
I
dcfor the induced current of described inductance;
T is the charging interval of described inductance.
6. single stage type booster type inverter according to claim 1, it is characterized in that, when the voltage limits that described DC pulse moving voltage normally works required lower than described external loading, part or all of brachium pontis in described inverter circuit is regulated to be pass-through state, inductance in described pi-network is charged, after pass-through state terminates, described inductance generates induced voltage and exports described inverter circuit to after superposing with described DC pulse moving voltage, and the voltage of the direct-flow input end of described inverter circuit is:
U
dcfor the voltage of the direct-flow input end of described inverter circuit;
U
recfor the voltage of the output of described input rectification circuit;
T
sfor the switch periods of the switching device of described inverter circuit;
T
0for the time of described pass-through state.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410186142.1A CN105099214A (en) | 2014-05-05 | 2014-05-05 | Single-stage step-up inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410186142.1A CN105099214A (en) | 2014-05-05 | 2014-05-05 | Single-stage step-up inverter |
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|---|---|
| CN105099214A true CN105099214A (en) | 2015-11-25 |
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ID=54578988
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Cited By (3)
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| CN105553275A (en) * | 2015-12-29 | 2016-05-04 | 湖南大学 | Six-phase inverter type high power DC boost converter and control method thereof |
| CN105958494A (en) * | 2016-04-29 | 2016-09-21 | 株洲中车时代电气股份有限公司 | Train power supply system comprising dual-output power system |
| CN110247430A (en) * | 2019-07-02 | 2019-09-17 | 中国商用飞机有限责任公司北京民用飞机技术研究中心 | The long-range distribution system low-voltage direct nonlinear load simulator of airplane distributed |
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Application publication date: 20151125 |
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