CN101350567A - Power conversion apparatus - Google Patents
Power conversion apparatus Download PDFInfo
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- CN101350567A CN101350567A CNA2008101316576A CN200810131657A CN101350567A CN 101350567 A CN101350567 A CN 101350567A CN A2008101316576 A CNA2008101316576 A CN A2008101316576A CN 200810131657 A CN200810131657 A CN 200810131657A CN 101350567 A CN101350567 A CN 101350567A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
- Power Conversion In General (AREA)
Abstract
The invention provides an electric power conversion equipment capable of reducing the cost of the driver circuit for driving the electric power conversion equipment and the insulating transformer equipped between the driver circuit and the power source. The electric power conversion equipment comprises a main circuit bus bar and an electric power conversion circuit. The electric power conversion circuit comprises: an anode side electric power conversion component connected between the anode bus bar and the alternating current output terminal; a cathode side electric power conversion component connected between the alternating current output terminal and the cathode bus bar; a driver circuit for controlling the anode side electric power conversion component and the cathode side electric power conversion component by alternately turning on and off; a driver power supply circuit for insulating the driving used electricity by the driver circuit used insulating transformer and supplying to the driver circuit; and control power supply used insulating transformer for insulating the driving used electricity and supplying to the driver power supply circuit. And the common-conductive electric potential point of the driver power supply circuit is connected to the main circuit bus bar.
Description
Technical field
The present invention relates to a kind of power inverter.Be particularly related to the electrically insulated structures in a kind of drive circuit that the power conversions element of the main circuit that constitutes power inverter is driven.
Background technology
Fig. 8 is the key diagram that the integral body of existing power inverter constitutes.In Fig. 8, power inverter (200) possesses the structure that makes positive electrode bus (P), negative pole bus (N) respectively, is connected with output point as the positive electrode bus (P) and the intermediate potential bus (COM) of the intermediate potential of negative pole bus (N) by the power conversions element.Then, turn-off (afterwards being called switch motion) these power conversions elements by conducting, essence produces alternating voltage.In the middle of the example of this figure, by converting direct voltage (Ep) to (En) from the alternating voltage that civilian power supply (500) obtains through transformer (300), (En) convert the direct voltage (Ep) that obtains the alternating voltage of optional frequency and amplitude to, and offer alternating current machine (400), just can carry out variable-ratio control to alternating current machine.
In addition, shutoff action by above-mentioned power conversions element, to convert direct voltage (Ep) to (En) from the alternating current that exchanges motor (400), and then the direct voltage (Ep) that obtains (En) is converted to the alternating voltage of civilian frequency, just can electric power be regenerated to civilian power supply (500) by transformer (300).Thus, can carry out deceleration control to the speed of alternating current machine.
Fig. 7 is the detailed maps of power conversions main circuit (100) of the power inverter (200) of pie graph 8.In the drawings, power conversions element (QP) (QPC) (QNC) (QN), respectively with drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) be connected, by from the drive signal (GP) of drive circuit (GPC) (GNC) (GN) carry out switch motion repeatedly.
To (DRVPC) (DRVNC) power supply (DRVS) of (DRVN) powering of drive circuit (DRVP), obtaining working behind the alternating current from main power source (MSRC).The existing situation about being made of a circuit of above-mentioned power supply (DRVS) also has situation about being made of a plurality of combination of circuits, here, the power circuit of drive circuit is carried out integral body record and narrate.
Main power source (MSRC) is the AC power that obtains from general civilian system, is single-phase or heterogeneous AC power (Fig. 7 represents with single phase poaer supply).
Here, power conversions element (QP) is (QNC) current potential (QN) (QPC), by its on off state, becomes (COM) any current potential in (N) of main circuit bus (P).If will become this one of the situation of current potential be referred to as " becoming the main circuit current potential ", then drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) also can become the main circuit current potential identical with the power conversions element.Therefore, in power conversions main circuit (100), zone (MCPA) is the part that becomes the main circuit current potential.
On the other hand, become the earth point (BP) of the circuit reference potential of power supply (DRVS), through main power source (MSRC) and the earth () be connected.Here, the decision power supply (DRVS) output (SCP) (SCPC) (SCNC) reference potential (SCN) earth point (BPP) (BPPC) (BPNC) (BPN) with earth point (BP) idiostatic.Therefore, power supply (DRVS) become the earth () current potential, in circuit conversion main circuit (100), zone (EPA) be become the earth () part of current potential.
From power supply (DRVS) to drive circuit (DRVP) (DRVPC) under the situation that (DRVNC) (DRVN) powers, above-mentioned power supply and drive circuit because be included in zone (MCPA) respectively and regional (EPA) in, so need it to carry out electric insulation.In addition, (DRVPC) (DRVNC) (DRVN) for drive circuit (DRVP), also respectively because of the on off state of power conversions element becomes (COM) any current potential in (N) of main circuit bus (P), and owing to become mutually different current potential, so also need electric insulation.
Thereby, for implement and the earth () between electric insulation, and the interelement electric insulation of different power conversions, power supply (DRVS) and drive circuit (DRVP) (DRVPC) (DRVNC) disposed insulating transformer (TRP) between (DRVN) (TRPC) (TRNC) (TRN).
On the other hand, put down in writing following content in the patent documentation 1: by adopting following formation, promptly each arm with electric power converter is that a plurality of thyristors are connected by unit, successively the gate drive apparatus of electric power from low-pressure side transmitted along separate routes to the high side gate drive device through the insulation transformer, thus, can reduce the voltage between 1 winding being applied on high-tension side insulating transformer and 2 windings, realize the low capacityization of insulating transformer.
Patent documentation 1: the spy opens the 2006-81232 communique
Yet, be applied to the alternating current machine of iron and steel rolling equipment, according to the difference of purposes many kinds are arranged, the main motor from the subsidiary engine motor of several kW to several thousand kW has.Therefore, also there is various capacity in the power inverter that drives these motors, and for example, the power inverter that above-mentioned main motor drives usefulness just needs the above capacity of several thousand kVA.
The method of conversion equipment capacity of increasing electric power has: the method that makes the main circuit direct voltage Towards Higher Voltage of the power conversions main circuit that constitutes it.Under the situation of carrying out Towards Higher Voltage because the position that becomes the main circuit current potential and the earth () between insulation voltage also by Towards Higher Voltage, so essential its insulating capacity of reinforcement.
This means that in the power inverter (200) of Fig. 7, heavy insulation transformer (TRP) is (TRNC) insulating capacity (TRN) (TRPC).
For (TRPC) (TRNC) insulating capacity (TRN) of heavy insulation transformer (TRP), just need to strengthen 1 side winding of each insulating transformer and the insulation distance between 2 side windings.In this case, it is big that the size of insulating transformer becomes, and the manufacturing cost of insulating transformer also uprises.In addition, the thing followed is that the size of power inverter (200) also becomes big and installation cost also uprises.In addition, above-mentioned patent documentation 1, relating to each arm is that unit drives the technology to the gate driver circuit of each a plurality of thyristor that are connected in series of each arm, be not as in the present invention with alternate conduction turn-off side of the positive electrode power conversions element and negative side power conversions element, be anodal side arm and negative pole side arm, gate driver circuit in insulation system be the technology of object.
Summary of the invention
The present invention puts in view of the above problems just and proposes, and it provides a kind of power inverter, can reduce the drive circuit of driving electric conversion element and be configured in the cost of the insulating transformer between this drive circuit power supply.
The present invention has adopted following means in order to solve above-mentioned problem.
A kind of power inverter comprises: the main circuit bus with positive electrode bus and negative pole bus; Be connected with this main circuit bus, to supply with the power conversion circuit that the direct current between the main circuit bus converts alternating current to and exports to ac output end, it is characterized in that, described power conversion circuit, comprise: be connected the side of the positive electrode power conversions element between described positive electrode bus and ac output end, and be connected the negative side power conversions element between described ac output end and the described negative pole bus; Alternate conduction is turn-offed the drive circuit that drives described side of the positive electrode power conversions element and negative side power conversions element; The driving power circuit that electricity consumption is insulated with insulating transformer by drive circuit and offered described drive circuit will be driven; With will drive with electric insulation and offer the control power supply insulating transformer of described driving power circuit, the common potential point of described driving power circuit is connected with the main circuit bus.
The present invention is owing to have above structure, so a kind of power inverter can be provided, makes the drive circuit of driving electric conversion element and the insulating transformer that is configured between this drive circuit power supply reduces cost.
Description of drawings
Fig. 1 is the key diagram of first embodiment.
Fig. 2 is the key diagram of second embodiment.
Fig. 3 is the key diagram of the 3rd embodiment.
Fig. 4 is the key diagram of the 4th embodiment.
Fig. 5 is the key diagram of the 5th embodiment.
Fig. 6 is the key diagram of the 6th embodiment.
Fig. 7 is the detailed maps of power conversions main circuit (100) of the power inverter (200) of pie graph 8.
Fig. 8 is the integrally-built key diagram of existing power inverter.
Fig. 9 is the key diagram of the power conversions element drives signal (conducting shutoff command signal) of power conversions main circuit.
Among the figure: the 200-power inverter, the 300-transformer, 400-alternating current machine, the civilian power supply of 500-, the output point of AC-power inverter, Ep, En-DC power supply, P, COM, N-main circuit bus, 100-power conversions main circuit, QP, QPC, QNC, QN-power conversions element, FWP, FWPC, FWNC, FWN-fly-wheel diode, DCP, DCN-clamp diode, V
*The instruction of-alternating voltage, Cr31, Cr32-compares the carrier wave of alternating voltage command value and amplitude, GP, GPC, GNC, GN-power conversions element QP, QPC, QNC, the element drives signal of QN, the output voltage of VAC-output point AC, DRVP, DRVPC, DRVNC, the DRVN-drive circuit, the DRVS-power supply, the MSRC-main power source, the earth point of BP-power supply, SCP, SCPC, SCNC, the output of SCN-power supply, BPP, BPPC, BPNV, the earth point of BPN-power supply output, the differential earth potential of MP-main circuit 100, the ER-earth resistance, TRP, TRPC, TRNC, the insulating transformer of TRN-main circuit 100, MCPA-main circuit potential range, EPA-ground potential scope, power conversions main circuit among 101-first embodiment, power conversions main circuit among 102-second embodiment, TRP1, TRPC1, TRNC1, TRN1-the present invention first, insulating transformer among second embodiment, MCPA1-first, main circuit potential range among second embodiment, EPA1-first, ground potential scope among second embodiment, COMP-first, the reference potential of the power supply among second embodiment is set with wiring, crossing current among COMPR-second embodiment suppresses to use resistance, power conversions main circuit among 103-the 3rd embodiment, power conversions main circuit among 104-the 4th embodiment, TRP3, TRPC3, TRNC3, TRN3-the present invention the 3rd, insulating transformer among the 4th embodiment, MCPA3-the 3rd, main circuit potential range among the 4th embodiment, EPA3-the 3rd, ground potential scope among the 4th embodiment, NP-the 3rd, the reference potential of the power supply among the 4th embodiment is set with wiring, crossing current among NPR-the 4th embodiment suppresses to use resistance, power conversions main circuit among 105-the 5th embodiment, power conversions main circuit among 106-the 6th embodiment, TRP5, TRPC5, TRNC5, TRN5-the present invention the 5th, insulating transformer among the 6th embodiment, MCPA5-the 5th, main circuit potential range among the 6th embodiment, EPA5-the 5th, ground potential scope among the 6th embodiment, PP-the 5th, the reference potential of the power supply among the 6th embodiment is set with wiring, crossing current among PPR-the 6th embodiment suppresses to use resistance, TRSRC-first, control power supply insulating transformer among second embodiment, TRSRC3-the 3rd, control power supply insulating transformer among the 4th embodiment, TRSRC5-the 5th, control power supply insulating transformer among the 6th embodiment.
Embodiment
Below, with reference to accompanying drawing, preferred forms is described.At first utilize Fig. 7 that the elemental motion of power inverter is described.
In power inverter shown in Figure 7 (200), direct voltage (Ep) (En) by dc bus (P) (COM) (N) be connected with power conversions main circuit (100).Here, direct voltage (Ep) (En) in common circuit operation is (Ep)=(En).
In power conversions main circuit (100), power conversions element (QP) (QPC) (QNC) (QN) so that time-amplitude and cycle are carried out switch motion arbitrarily, and, respectively with power conversions element (QP) (QPC) (QNC) (QN) be considered as under the situation of unit element, should " unit element " form by a power conversions element (1 series connection) or a plurality of power conversions elements (series connection more than 2) of being connected in series.In addition, two " element unit " above power conversions element is controlled in the mode of not conducting simultaneously.Fig. 7 represents " the element unit " of power conversions element situation that is connected in series and constitutes by the power conversions element.
Power conversions element (QP) is (QNC) switch motion (QN) (QPC), by drive circuit (DRVP) (DRVPC) (DRVNC) element drives signal (GP) of (DRVN) producing (GPC) (GNC) (GN) drive.
Fig. 9 is the key diagram of the power conversions element drives signal (conducting shutoff command signal) of power conversions main circuit.Fig. 9 represents the voltage instruction (V to output point (AC)
*), (GPC) (GNC) example (GN) of the actual output voltage (VAC) of output point (AC) and element drives signal (GP).
In Fig. 9, for the alternating voltage instruction (V of optional frequency and amplitude
*), relatively its carrier wave (Cr31) (Cr32) and amplitude, according to its magnitude relationship, (GPC) (GNC) (GN) to generate element drive signal (GP).According to the element drives signal (GP) that generates (GPC) (GNC) (GN), make power conversions element (QP) (QPC) (QNC) (QN) carry out switch motion, thereby to output point (AC) output and alternating voltage instruction (V
*) output voltage (VAC) of equal value.
Here, electronic switch element (QP) (QPC) (QNC) be under the situation of the voltage driven element as IGBT (QN), element drives signal (GP) (GPC) (GNC) is a voltage signal (GN).
Output point (AC) is connected with load circuit (alternating current machine among Fig. 8 (400) or transformer (300)), just conversion or inverse conversion by between the alternating voltage that load circuit is carried out direct voltage and optional frequency and amplitude can realize the supply and the recovery of electric power.
Below, utilize Fig. 7, the insulation system of the power conversions element driving circuit in the power inverter of Fig. 8 is described.
Since drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) with power conversions element (QP) (QPC) (QNC) (QN) be connected, so its circuit reference potential is (COM) current potential of one of (N) of main circuit bus (P).Therefore, drive circuit (DRVP) is (DRVNC) (DRVN) separately circuit reference potential (DRVPC), and because of the difference of the on off state of power conversions element is different, its maximum potential difference is formula [1].
Maximum potential difference between drive circuit=(Ep)+(En) ... [1]
Here, because (Ep)=(En), so formula [1] can be rewritten as formula [1 '].
Maximum potential difference between drive circuit=2 * (En) ... [1 ']
Drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) to the earth () potential difference, by the decision of the above earth potential of power conversions main circuit (100).In Fig. 7, main circuit bus (COM) is through earth resistance (ER) ground connection, and at this moment, the above earth potential of main circuit bus (N) is (MP).
At this moment (DRVPC) (DRVNC) above earth potential (DRVN) of drive circuit (DRVP) becomes formula [2] according to formula [1 '].
The drive circuit above earth potential
=(MP)+drive circuit between maximum potential difference (formula [1])
＝(MP)+2×(En)…[2]
On the other hand, become the earth point (BP) of the circuit reference potential of power supply (DRVS), through main power source (MSRC) and the earth () be connected.In addition, the output (SCP) of power supply (DRVS) (SCPC) (SCNC) (SCN) in, the earth point (BPP) that determines each reference potential (BPPC) (BPNC) is (BPN) idiostatic with earth point (BP).Here, the zone (MCPA) be the main circuit current potential, the zone (EPA) be the earth () current potential.
Therefore, (DRVPC) (DRVNC) (DRVN) for drive circuit (DRVP), need carry out the electric insulation between electric insulation between each drive circuit and they and the power supply (DRVS), insulation voltage between each drive circuit is with formula [1] expression, they with power supply (DRVS) between insulation voltage with formula [2] expression.
Their magnitude relationship is represented with formula [3] by formula [1 '], formula [2] as can be known.
Formula [2] 〉=formula [1 '] ... [3]
Therefore, for carry out between above-mentioned drive circuit electric insulation and and above-mentioned power supply between electric insulation, insulating transformer (TRP) is set, and (TRPC) (TRNC) (TRN).In addition, consider the relation of formula [3], insulating transformer (TRP) is (TRNC) (TRN) needed insulation voltage specification (TRPC), with formula [2] expression.
Below, utilize Fig. 1, first embodiment is described.As shown in Figure 1, the direct voltage (Ep) in the power inverter (200) (En), through dc bus (P) (COM) (N) be fed into power conversions main circuit (100).This is identical with the relation of power inverter (200) and power conversions main circuit (100) among Fig. 7.
In addition, (QPC) (QNC) action (QN) is also identical with their action in the power conversions main circuit (100) among Fig. 7 for the power conversions element (QP) in the power conversions main circuit (101).
In addition, drive circuit (DRVP) (DRVPC) (DRVNC) circuit reference potential (DRVN) is also identical with in the power conversions main circuit (100) among Fig. 7 those, all is (COM) current potential of one of (N) of main circuit bus (P).
Therefore, drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) separately maximal phase potential difference with formula [1 '] expression, in addition, drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) to the current potential of the earth with formula [2] expression.
The earth point (BP) of the circuit reference potential of decision power supply (DRVS), by wiring (COMP), (COM) is connected with the main circuit bus.In addition, the decision power supply (DRVS) output (SCP) (SCPC) (SCNC) reference potential separately (SCN) earth point (BPP) (BPPC) (BPNC) (BPN), (BP) is idiostatic with earth point.
Here, the zone (MCPA1) be the main circuit current potential, the zone (EPA1) be the earth () current potential.The differential earth potential of power supply (DRVS) is represented with formula [4].
The differential earth potential of power supply (DRVS)=(MP)+(En) ... [4]
Therefore, desired insulation phase difference is also used formula [4] expression between 1 winding-2 time winding of insulating transformer (TRSRC).The needed insulation voltage specification of insulating transformer (TRSRC) is also used formula [4] expression.
On the other hand, drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) and the potential difference between power supply (DRVS), the value (formula [5]) that obtains for power supply (DRVS) differential earth potential that from the drive circuit differential earth potential of formula [2], deducts formula [4].
Drive circuit differential earth potential (formula [4])-power supply differential earth potential (formula [5])
＝(MP)+2×(En)-{(MP)+(En)}
＝(En)
Therefore, for drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) need carry out the electric insulation between electric insulation between each drive circuit and they and the power supply (DRVS).Insulated electro potential difference between each drive circuit is with formula [1 '] expression, they with power supply (DRVS) between the insulated electro potential difference with formula [5] expression.
Their magnitude relationship is represented with formula [6] by formula [1 '], formula [5] as can be known.
Formula [1 '] 〉=formula [5] ... [6]
In order to carry out above-mentioned electric insulation (electric insulation between the electric insulation between the drive circuit, they and the power supply (DRVS)), insulating transformer (TRP1) is set, and (TRPC1) (TRNC1) (TRN1).
Here, though according to formula [6], insulating transformer (TRP1) (TRPC1) (TRNC1) (TRN1) needed insulation voltage specification be formula [1], but in fact, because the circuit reference potential (BP) of power supply (DRVS) and earth point (BPP) (BPPC) (BPNC) are main circuit bus (COM) (BPN), so the insulated electro potential difference between 1 winding-2 time winding of insulating transformer is with formula [7]～[9] expression.
The drive circuit current potential is the situation of main circuit bus (P) current potential: potential difference=(Ep) ... [7]
The drive circuit current potential is the situation of main circuit bus (COM) current potential: potential difference=0 ... [8]
The drive circuit current potential is the situation of main circuit bus (N) current potential: potential difference=(En) ... [9]
That is, insulating transformer (TRP1) is (TRNC1) (TRN1) desired insulating capacity (TRPC1), according to formula [7]～[9], obtains with formula [10].
Insulating transformer insulating capacity=(Ep) or (En) ... [10]
In addition because (Ep), (En)＞0 and (Ep)=(En), so formula [10] is rewritten as formula [11].
The insulating transformer insulating capacity=(En) ... [11]
Here, to existing insulating transformer (TRP) (TRPC) (TRNC) (TRN) the insulation voltage specification and the insulating transformer (TRP1) of first embodiment (TRPC1) (TRNC1) insulation voltage specification (TRN1) compare.
With the right, the right of formula [2], obtain formula [12] divided by formula [11].
Formula [2]/formula [11]={ (MP)+2 * (En) }/{ (En) }=A+2 ... [12] (A=(MP)/(En)＞0 here)
By formula [12] as can be known, existing insulating transformer (TRP) shown in Figure 7 is (TRNC) insulation voltage specification (TRN) (TRPC), need be (TRPC1) more than 2 times of (TRNC1) insulation voltage specification (TRN1) of insulating transformer (TRP1) of first embodiment of the invention.In addition, above-mentioned resistance (ER) is the earth resistance that fault is set that is used for detecting alternating current (AC), and above-mentioned differential earth potential (MP) is subjected in the above-mentioned earth resistance influence of the electric current that flows and changes.
The insulation voltage specification of insulating transformer is subjected to the influence of the insulation distance between 1 side winding and 2 side windings, if the insulation voltage specification becomes 2 times, then its necessary insulation distance also becomes more than 2 times.Therefore, the insulating transformer of first embodiment (TRP1) is (TRNC1) transformer size (TRN1) (TRPC1), can make be in the past insulating transformer (TRP) (TRPC) (TRNC) (TRN) below 1/2.In addition, its manufacturing cost is generally also proportional with the transformer size, and institute thinks below 1/2.
As above explanation, first embodiment can make below the insulating transformer miniaturization to 1/2 of the necessity in the power conversions element driving circuit system of power inverter, and can reduce its manufacturing cost.
In addition, compare, need newly-increased insulating transformer (TRSRC) with conventional example shown in Figure 7, but since its to append the platform number few, so, less to the influence of the miniaturization of power inverter itself and installation cost.
Fig. 2 is the figure of explanation second embodiment.Be with the difference of first embodiment: with the earth point (BP) of power supply (DRVS), the resistance through being used for suppressing to flow over (COMP), by wiring (COMP), (COM) is connected with the main circuit bus.Because the potential difference and the resulting effect of each one are identical with Fig. 1, so explanation is omitted.
Fig. 3 is the figure of explanation the 3rd embodiment.Direct voltage (Ep) in the power inverter (200) (En), by through dc bus (P) (COM) (N) provide to power conversions main circuit (103).This is identical with the power inverter (200) and the relation of power conversions main circuit (100) among Fig. 7 of existing structure.
In addition, (QPC) (QNC) action (QN) of the power conversions element (QP) in the power conversions main circuit (103), also identical with their action in the power conversions main circuit (100) among Fig. 7.
In addition, drive circuit (DRVP) (DRVPC) (DRVNC) circuit reference potential (DRVN) is also identical with in the power conversions main circuit (100) among Fig. 7 they, all is (COM) current potential of one of (N) of main circuit bus (P).
Therefore, drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) separately maximal phase potential difference with formula [1 '] expression, and drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) current potential of the earth is also used formula [2] expression.
The earth point (BP) of the circuit reference potential of decision power supply (DRVS), by wiring (NP), (N) is connected with the main circuit bus.In addition, the decision power supply (DRVS) output (SCP) (SCPC) (SCNC) reference potential (SCN), separately earth point (BPP) (BPPC) (BPNC) (BPN) with earth point (BP) idiostatic.
Here, zone (MCPA3) is the main circuit current potential, and zone (EPA3) is a ground potential.The differential earth potential of power supply (DRVS) is represented with formula [13].
The differential earth potential of power supply (DRVS)=(MP) ... [13]
Therefore, the insulation phase difference between 1 winding-2 time winding of insulating transformer (TRSRC3) is also used formula [13] expression.The needed insulation voltage specification of insulating transformer (TRSRC3) is also used formula [13] expression.
On the other hand, drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) and the potential difference between power supply (DRVS), for the drive circuit differential earth potential from formula [2] deducts the value (formula [14]) that power supply (DRVS) differential earth potential of formula [13] obtains.
Drive circuit differential earth potential (formula [2])-power circuit differential earth potential (formula [13])
＝(MP)+2×(En)-(MP)
＝2×(En)…[14]
Therefore, for drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) need carry out the electric insulation between electric insulation between each drive circuit and they and the power supply (DRVS).Because the insulated electro potential difference between each drive circuit is with formula [1 '] expression, they with power supply (DRVS) between the insulated electro potential difference with formula [14] expression, so its value is identical value.
In order to carry out above-mentioned electric insulation (electric insulation between the electric insulation between the drive circuit, they and the power supply (DRVS)), insulating transformer (TRP3) is set, and (TRPC3) (TRNC3) (TRN3).
Though insulating transformer (TRP3) is (TRNC3) (TRN3) necessary insulation voltage specification (TRPC3), represent with formula [14], but its with as (TRPC) (TRNC) (TRN) formula of necessary insulation voltage specification [2] poor of existing insulating transformer (TRP), represent with following formula.
Formula [2]-Shi [14]=(MP)+2 * (En)-2 * (En)=(MP) ... [15]
According to formula [15], the insulating transformer of third embodiment of the invention (TRP3) is (TRNC3) insulation voltage specification (TRN3) (TRPC3), with existing insulating transformer (TRP) (TRPC) (TRNC) insulation voltage specification (TRN) compare, be lowered (MP).
The insulation voltage specification of insulating transformer is subjected to the influence of the insulation distance between 1 side winding and 2 side windings, if the insulation voltage specification becomes 2 times, then its necessary insulation distance also becomes more than 2 times.Therefore, with respect to existing insulating transformer (TRP) (TRPC) (TRNC) (TRN), the insulating transformer of the 3rd embodiment (TRP3) (TRPC3) (TRNC3) transformer size (TRN3) is realized miniaturization, and the insulation voltage specification only reduces (MP).In addition, because its manufacturing cost is generally also proportional with the transformer size, so be lowered.
As above explanation, among the 3rd embodiment, can in the power conversions element driving circuit system of power inverter, make necessary insulating transformer miniaturization, and the insulation voltage specification only reduces (MP), and can reduce its manufacturing cost.In addition, compare with conventional example shown in Figure 7, though need newly-increased insulating transformer (TRSRC3), because that it appends the platform number is few, so, influence less to the miniaturization and the installation cost of power inverter itself.
Fig. 4 is the figure of explanation the 4th embodiment.Be with the difference of the 3rd embodiment: with the resistance (NPR) of earth point (BP) through being used for suppressing to flow over of power supply (DRVS), by wiring (NP), (N) is connected with the main circuit bus.Because the potential difference and the resulting effect of each one are identical with Fig. 3, so explanation is omitted.
Fig. 5 is the figure of explanation the 5th embodiment.Direct voltage (Ep) in the power inverter (200) (En), through dc bus (P) (COM) (N) provide to power conversions main circuit (105).This is identical with the power inverter (200) and the relation of power conversions main circuit (100) among Fig. 7.
In addition, (QPC) (QNC) action (QN) of the power conversions element (QP) in the power conversions main circuit (105), also identical with their action in the power conversions main circuit (100) among Fig. 7.
In addition, drive circuit (DRVP) is (DRVNC) circuit reference potential (DRVN) (DRVPC), and is also identical with in the power conversions main circuit (100) among Fig. 7 they, all is (COM) current potential of one of (N) of main circuit bus (P).
Therefore, drive circuit (DRVP) is (DRVNC) (DRVN) separately maximal phase potential difference (DRVPC), with formula [1 '] expression, and since to the earth () current potential, the above earth potential of main circuit bus (P) become (MPP), so represent with formula [16].
The drive circuit differential earth potential
=(MPP)+drive circuit between maximum potential difference (formula [1])
＝(MPP)+2×(En)…[16]
The earth point (BP) of the circuit reference potential of decision power supply (DRVS), by wiring (PP), (P) is connected with the main circuit bus.In addition, output (SCP) (SCPC) (SCNC) (SCN) in, the decision separately reference potential earth point (BPP) (BPPC) (BPNC) (BPN), (BP) is idiostatic with earth point.
Here, in Fig. 5, zone (MCPA5) is the main circuit current potential, and zone (EPA5) is a ground potential.The differential earth potential of power supply (DRVS) is represented with formula [17].The differential earth potential of power supply (DRVS)=(MPP) ... [17]
Therefore, the insulated electro potential difference between 1 winding-2 time winding of insulating transformer (TRSRC5) is also used formula [17] expression.The needed insulation voltage specification of insulating transformer (TRSRC5) is also used formula [17] expression.
On the other hand, drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) and the potential difference between power supply (DRVS), the value (formula [18]) that obtains for power supply (DRVS) differential earth potential that from the drive circuit differential earth potential of formula [16], deducts formula [17].
Drive circuit differential earth potential (formula [16])-power circuit differential earth potential (formula [17])
＝(MPP)-{(MPP)-2×(En)}
＝2×(En)…[18]
Therefore, for drive circuit (DRVP) (DRVPC) (DRVNC) (DRVN) need carry out the electric insulation between electric insulation between each drive circuit and they and the power supply (DRVS).Because the insulated electro potential difference between each drive circuit is with formula [1 '] expression, they with power supply (DRVS) between the insulated electro potential difference with formula [18] expression, so its value is identical value.
In order to carry out above-mentioned electric insulation (electric insulation between the electric insulation between the drive circuit, they and the power supply (DRVS)), insulating transformer (TRP5) is set, and (TRPC5) (TRNC5) (TRN5).
Insulating transformer (TRP5) (TRPC5) (TRNC5) (TRN5) necessary insulation voltage specification with formula [18] expression, but it with as existing insulating transformer (TRP) (TRPC) (TRNC) (TRN) difference of the formula of necessary insulation voltage specification [2] represent with following formula.
Formula [2]-Shi [18]=(MP)+2 * (En)-2 * (En)=(MP) ... [19]
According to formula [19], the insulating transformer of fifth embodiment of the invention (TRP5) is (TRNC5) insulation voltage specification (TRN5) (TRPC5), with existing insulating transformer (TRP) (TRPC) (TRNC) insulation voltage specification (TRN) compare, be lowered (MP).
The insulation voltage specification of insulating transformer is subjected to the influence of insulation distance between 1 side winding and 2 side windings, if the insulation voltage specification becomes 2 times, then its necessary insulation distance also becomes more than 2 times.Therefore, with respect to existing insulating transformer (TRP) (TRPC) (TRNC) (TRN), the insulating transformer of the 5th embodiment (TRP5) is (TRNC5) transformer compact in size (TRN5) (TRPC5), and the insulation voltage specification only reduces (MP).In addition, its manufacturing cost is generally also proportional with the transformer size, so be lowered.
As above explanation, among the 5th embodiment, in the power conversions element driving circuit system of power inverter, make necessary insulating transformer miniaturization, and the insulation voltage specification only reduces (MP), and can reduce its manufacturing cost.In addition, compared with the past, though need newly-increased insulating transformer (TRSRC5), because that it appends the platform number is few, so, influence less to the miniaturization and the installation cost of power inverter itself.
Fig. 6 is the figure of explanation the 6th embodiment.Be with the difference of the 5th embodiment: with the earth point (BP) of power supply (DRVS), the resistance through being used for suppressing to flow over (PPR), by wiring (PP), (P) is connected with the main circuit bus.Because the potential difference and the resulting effect of each one are identical with Fig. 5, so explanation is omitted.
As above explanation, according to the embodiment of the present invention, between power circuit (DRVS) and main power source (MSRC), newly establish be used for the earth () insulating transformer of electric insulation, the reference potential of power circuit (DRVS) is made as main circuit current potential arbitrarily.Thereby, can make (TRPC) (TRNC) insulating capacity (TRN) of insulating transformer (TRP), only be the electric insulation between the different power conversions elements, and be not used for carrying out the ability of the earth insulation.Thus, can realize (TRPC) (TRNC) miniaturization, cost degradation (TRN) of insulating transformer (TRP).
In addition, though need newly establish insulating transformer, owing to, get final product so its newly-increased number is 1 as long as with carrying out electric insulation in the lump between power circuit (DRVS) and main power source (MSRC).The increase of the parts installing space that is brought by above-mentioned setting up and cost increase, and can reduce by (TRPC) (TRNC) installing space that (TRN) miniaturization realized reduction of above-mentioned insulating transformer (TRP), cost, are fully absorbed.
Claims (10)
1. a power inverter comprises: the main circuit bus with positive electrode bus and negative pole bus; Be connected with this main circuit bus, will supply to direct current between the main circuit bus and convert alternating current to and, it is characterized in that to the power conversion circuit of ac output end output,
Described power conversion circuit comprises:
Be connected the side of the positive electrode power conversions element between described positive electrode bus and ac output end, and be connected the negative side power conversions element between described ac output end and the described negative pole bus;
Alternate conduction is turn-offed the drive circuit that drives described side of the positive electrode power conversions element and negative side power conversions element;
The driving power circuit that electricity consumption is insulated with insulating transformer by drive circuit and offered described drive circuit will be driven; With
To drive with electric insulation and offer the control power supply insulating transformer of described driving power circuit,
The common potential point of described driving power circuit is connected with the main circuit bus.
2. a power inverter comprises: the main circuit bus with positive electrode bus, negative pole bus and intermediate potential bus; Be connected with this main circuit bus, convert alternating current to and, it is characterized in that offering direct current between the main circuit bus to the power conversion circuit of ac output end output,
Described power conversion circuit comprises:
Be connected the side of the positive electrode power conversions element between described positive electrode bus and ac output end, and be connected the negative side power conversions element between described ac output end and the described negative pole bus;
Drive circuit, it comprises that the conducting shutoff drives the side of the positive electrode drive circuit of described side of the positive electrode power conversions element and the negative side drive circuit that the described negative side power conversions element of ground driving is turn-offed in conducting;
By the drive circuit insulating transformer, make driving also offer the driving power circuit of described side of the positive electrode drive circuit and described negative side drive circuit respectively with electric insulation; With
Make driving with electric insulation and offer the control power supply insulating transformer of described driving power circuit,
The common potential point of described driving power circuit is connected with the main circuit bus.
3. a power inverter comprises: the main circuit bus with positive electrode bus, negative pole bus and intermediate potential bus; Be connected with this main circuit bus, convert alternating current to and, it is characterized in that offering direct current between the main circuit bus to the power conversion circuit of ac output end output,
Described power conversion circuit comprises:
Be connected the 1st and the 2nd power conversions element between described positive electrode bus and ac output end, be connected the 3rd and the 4th power conversions element, the tie point that is connected described the 1st power conversions element and the 2nd power conversions element and the 1st clamp diode between the intermediate potential bus between described ac output end and the described negative pole bus and be connected the tie point of described the 3rd power conversions element and the 4th power conversions element and the 2nd clamp diode between the intermediate potential bus;
Have conducting and turn-off the side of the positive electrode drive circuit of driving the described the 1st and the 2nd power conversions element and the drive circuit that the negative side drive circuit that drives the described the 3rd and the 4th power conversions element is turn-offed in conducting;
By the drive circuit insulating transformer, make driving also supply with the driving power circuit of described side of the positive electrode drive circuit and described negative side drive circuit respectively with electric insulation; With
Make driving with electric insulation and offer the control power supply insulating transformer of described driving power circuit,
The common potential point of described driving power circuit is connected with the main circuit bus.
4. power inverter according to claim 2 is characterized in that,
The common potential point of described driving power circuit is connected with positive electrode bus.
5. power inverter according to claim 2 is characterized in that,
The common potential point of described driving power circuit is connected with the negative pole bus.
6. power inverter according to claim 2 is characterized in that,
The common potential point of described driving power circuit is connected with the intermediate potential bus.
7. power inverter according to claim 2 is characterized in that,
1st, the 2nd, the 3rd and the 4th power conversions element, the series circuit by a plurality of power conversions elements constitutes respectively.
8. power inverter according to claim 2 is characterized in that,
Described intermediate potential bus is through ground resistance earth.
9. power inverter according to claim 2 is characterized in that,
With the common potential point of described driving power circuit, suppress resistance through crossing current and be connected with the main circuit bus.
10. power inverter according to claim 2 is characterized in that,
The common potential point of described driving power circuit suppresses resistance through crossing current and is connected with the intermediate potential bus.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007188402 | 2007-07-19 | ||
| JP2007-188402 | 2007-07-19 | ||
| JP2007188402A JP4574651B2 (en) | 2007-07-19 | 2007-07-19 | Power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101350567A true CN101350567A (en) | 2009-01-21 |
| CN101350567B CN101350567B (en) | 2012-05-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101316576A Active CN101350567B (en) | 2007-07-19 | 2008-07-21 | Power conversion apparatus |
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| Country | Link |
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| JP (1) | JP4574651B2 (en) |
| KR (2) | KR20090009156A (en) |
| CN (1) | CN101350567B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5318040B2 (en) * | 2010-07-08 | 2013-10-16 | 株式会社日立製作所 | Power converter |
| DE102018126235B4 (en) * | 2018-10-22 | 2020-06-04 | Sma Solar Technology Ag | Process for measuring insulation resistance in inverters with multi-point topology and inverters with multi-point topology |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6032574A (en) * | 1983-08-01 | 1985-02-19 | Hitachi Ltd | Inverter device |
| JP3122312B2 (en) * | 1994-07-22 | 2001-01-09 | 株式会社東芝 | Power converter |
| JPH08172772A (en) * | 1994-12-19 | 1996-07-02 | Fanuc Ltd | Transistor driving floating power supply |
| JP3730137B2 (en) * | 2001-05-23 | 2005-12-21 | 東芝三菱電機産業システム株式会社 | Power converter |
| JP2004088858A (en) * | 2002-08-26 | 2004-03-18 | Mitsubishi Electric Corp | Power conversion device |
| JP4661139B2 (en) * | 2004-09-07 | 2011-03-30 | 富士電機ホールディングス株式会社 | Power supply system to gate drive device |
| CN2798410Y (en) * | 2005-05-13 | 2006-07-19 | 浙江工业大学 | Combined switch electric source |
-
2007
- 2007-07-19 JP JP2007188402A patent/JP4574651B2/en not_active Expired - Fee Related
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2008
- 2008-07-18 KR KR1020080069985A patent/KR20090009156A/en not_active Application Discontinuation
- 2008-07-21 CN CN2008101316576A patent/CN101350567B/en active Active
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| Publication number | Publication date |
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| JP2009027832A (en) | 2009-02-05 |
| CN101350567B (en) | 2012-05-30 |
| KR20090009156A (en) | 2009-01-22 |
| KR20110051175A (en) | 2011-05-17 |
| JP4574651B2 (en) | 2010-11-04 |
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