US20080084642A1 - Semiconductor Power Conversion Apparatus - Google Patents
Semiconductor Power Conversion Apparatus Download PDFInfo
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- US20080084642A1 US20080084642A1 US11/861,500 US86150007A US2008084642A1 US 20080084642 A1 US20080084642 A1 US 20080084642A1 US 86150007 A US86150007 A US 86150007A US 2008084642 A1 US2008084642 A1 US 2008084642A1
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- protection circuit
- power conversion
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 51
- 239000004065 semiconductor Substances 0.000 title claims abstract description 50
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- 230000003071 parasitic effect Effects 0.000 description 8
- 239000004020 conductor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002950 deficient Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
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- 230000006378 damage Effects 0.000 description 1
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- 150000004706 metal oxides Chemical class 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0828—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in composite switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
- H03K17/6871—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors the output circuit comprising more than one controlled field-effect transistor
Abstract
A semiconductor power conversion apparatus capable of protecting an IGBT from an overvoltage by supplying a sufficient gate current to the gate of the IGBT. The IGBT is protected from the overvoltage by connecting clamping elements connected in series between a collector of the IGBT and the gate thereof, and by connecting a resistor to each of different junction points between the clamping elements connected in series.
Description
- The present invention relates to semiconductor power conversion apparatuses using semiconductor elements and more particularly, to a semiconductor power conversion apparatus which suppresses an overvoltage upon switching operation.
- In such a semiconductor power conversion apparatus having a MOS (Metal Oxide Semiconductor) gate semiconductor, such as an IGBT (Insulated Gate Bipolar Transistor) power conversion apparatus, an IGBT element (device) is switched to achieve AC/DC power conversion, DC voltage conversion, AC voltage/frequency conversion, etc. However, when the IGBT is turned OFF, an energy, accumulated in the parasitic inductance of a wiring line when a current flows therethrough, causes a surge voltage to be applied to the IGBT. A method of preventing the destruction of the IGBT element caused by the surge voltage induced upon the turning off of the IGBT, that is, by the overvoltage applied to the IGBT, is disclosed, for example, in JP-A-11-17831. In the prior art, a series circuit of a clamping element and a resistor is provided between a collector of the IGBT and a gate thereof, so that the voltage of the IGBT exceeding the voltage of the clamping element causes a charging current to be supplied from the clamping element to the gate of the IGBT. And setting of a higher gate voltage for the IGBT causes the impedance of the IGBT to be reduced, thus protecting the IGBT from an overvoltage. In the prior art, further, such a means is disclosed as to provide a plurality of series circuits each having the clamping element and the resistor and to set different voltages for the respective clamping elements, thus supplying more charging current for a higher collector voltage. In general, even when a gate charging current is supplied from a clamping element, the current is shunted to a gate driver and thus it is impossible to secure a sufficient amount of the gate charging current. However, since the higher collector voltage can supply more charging current in the prior art, we can say that the prior art is excellent from the viewpoint of reliably protecting the IGBT from the overvoltage upon application thereof.
- In order to reliably protect the IGBT from the overvoltage, it is necessary, when the overvoltage is applied to the IGBT, to quickly supply the charging current to the gate of the IGBT to increase the gate voltage and to reduce the impedance of the IGBT. To this end, it is required to minimize the impedance of wiring lines of the clamping element and the resistor connected between the collector of the IGBT and the gate thereof. The wiring impedance can be decreased by reducing the length of the wiring lines. Accordingly, for the purpose of shortening the wiring distance, a charging current supply circuit such as a series circuit of the clamping element and the resistor wired between the collector of the IGBT and the gate thereof is provided as close to the IGBT as possible. In order to arrange the series circuit of the clamping element and the resistor close to the IGBT, it is necessary to make compact the charging current supply circuit such as the series circuit of the clamping element and the resistor. In the prior art, however, since it is required to arrange a plurality of such series circuits each having the clamping element and the resistor, the size of the charging current supply circuit (overvoltage protection circuit) becomes large and therefore it is difficult to locate the charging current supply circuit close to the IGBT.
- It is an object of the present invention to provide a technique for protecting an IGBT from an overvoltage by making an overvoltage protection circuit compact and supplying a charging current to a gate of the IGBT.
- The object of the present invention is attained by providing a semiconductor power conversion apparatus which includes a MOS gate semiconductor and an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate of the semiconductor, wherein the overvoltage protection circuit has a plurality of clamping elements connected in series and a resistor is connected to each of anodes of the plurality of clamping elements.
- The object of the present invention is also attained by providing a semiconductor power conversion apparatus which includes a MOS gate semiconductor and an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate of the semiconductor, wherein, as a current supplied from the overvoltage circuit is greater, the value of a saturation current of a semiconductor element at the output stage of a gate driver is smaller.
- The above object of the present invention is also attained by providing a semiconductor power conversion apparatus which includes a MOS gate semiconductor and an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate of the semiconductor, wherein a reactor is connected between the overvoltage protection circuit and a gate driver.
- The above object of the present invention is also attained by providing a semiconductor power conversion apparatus which includes a MOS gate semiconductor and an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate of the semiconductor, wherein the length of a wiring line between the overvoltage protection circuit and a gate driver is longer than a distance between the overvoltage protection circuit and the gate of an IGBT.
- The object of the present invention is also attained by providing a semiconductor power conversion apparatus which includes a MOS gate semiconductor and an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate of the semiconductor, wherein the value of a current flowing into the gate is limited to a predetermined value.
- When a voltage exceeding a clamping element voltage is applied across the collector of the IGBT and the gate of the IGBT, a charging current is supplied from a first resistor. When a voltage exceeding a voltage corresponding to two clamping element voltages is applied across the collector of the IGBT and the gate of the IGBT, a charging current is supplied also from a second resistor. Thus greater gate charging current can be supplied as the voltage is higher.
- With such an arrangement, since the need of connecting the clamping elements in parallel can be eliminated and the number of such clamping elements can be reduced unlike the prior art, a charging current supply circuit (overvoltage protection circuit) can be made compact.
- Further, more charging current to the gate can be secured by suppressing a current shunted or branched to the gate driver. Accordingly, by suppressing the current shunted or branched to the gate driver, the IGBT can be protected from an overvoltage even without any need of increasing the size of the overvoltage protection circuit.
- Other objects, features and advantages of the invention will become apparent from the following description of the embodiments of the invention taken in conjunction with the accompanying drawings.
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FIG. 1 shows a major part of an IGBT power conversion apparatus in accordance with a first embodiment of the present invention corresponding to one arm; -
FIG. 2 shows a major part of an IGBT power conversion apparatus in accordance with a second embodiment of the present invention corresponding to one arm; -
FIG. 3 shows a major part of an IGBT power conversion apparatus in accordance with a third embodiment of the present invention corresponding to one arm; -
FIG. 4 shows a major part of an IGBT power conversion apparatus in accordance with a fourth embodiment of the present invention corresponding to one arm; -
FIG. 5 shows a major part of the IGBT power conversion apparatus according to an embodiment of the present invention; -
FIG. 6 shows a major part of an IGBT power conversion apparatus in accordance with a fifth embodiment of the present invention corresponding to one arm; -
FIG. 7 shows a mounted state of the major part of the IGBT power conversion apparatus of the fourth embodiment of the invention corresponding to one arm; -
FIG. 8 shows a major part of an IGBT power conversion apparatus in accordance with a sixth embodiment of the present invention; -
FIG. 9 is a diagram for explaining the operation of the first embodiment; -
FIG. 10 shows a major part of an up/down arm in the IGBT power conversion apparatus of the sixth embodiment of the invention; and -
FIG. 11 shows a major part of the up/down arm in the IGBT power conversion apparatus of the sixth embodiment of the invention. - The present invention will be detailed in connection with embodiments of the invention with reference to the accompanying drawings. In the drawings for explaining the embodiments, constituent elements having the same functions are denoted by the same reference numerals or symbols. An emitter potential in each IGBT is used as a reference. In such a situation that an overvoltage is applied between a collector of the IGBT and an emitter thereof, a collector-to-emitter voltage is much higher than a gate-to-emitter voltage, and thus the collector-to-emitter voltage can be regarded as nearly the same as a collector-to-gate voltage. Thus the collector-to-emitter voltage and the collector-to-gate voltage will be both referred to as a collector voltage, hereinafter. In the following embodiments, explanation will be made in connection with an IGBT as an example. However, even when the IGBT is replaced by a MOS gate device, effects similar to those of the IGBT can be obtained.
- Explanation will be made first as to the arrangement of an IGBT power conversion apparatus in accordance with an embodiment with use of
FIGS. 1 and 5 .FIG. 5 shows a major part of the power conversion apparatus to which the present invention is applied, andFIG. 1 shows a major part of anarm 20 inFIG. 5 . - First of all, the arrangement of the power conversion apparatus according to a first embodiment will be explained by referring to
FIG. 5 . In the power conversion apparatus of the present embodiment, 3 of twoarms 20 connected in series are connected in parallel and also connected to aDC voltage source 21 viawiring lines wiring lines arm 20 is usually connected to theDC voltage source 21 via busbars or the like. As theDC voltage source 21, a DC capacitor may be used. Meanwhile, when the power conversion apparatus is an AC-to-DC conversion type,midpoints 203 between the paired two arms are usually connected to an AC system or an AC load via an impedance. InFIG. 5 , as an example, themidpoint 203 of each arm is connected to aload 22 having an impedance. In this connection, theDC voltage source 21 or a wiring line connected between theDC voltage source 21 and thearm 20 has a parasitic inductance. InFIG. 5 , such parasitic inductances are collected in a P (positive) side as aparasitic inductance 23. Although the 3-phase AC-to-DC conversion apparatus is illustrated inFIG. 5 , the present invention is not limited to the 3-phase apparatus but may be effectively applied even to an AC-to-DC conversion IGBT power apparatus of a full bridge type or to a DC-to-DC IGBT power conversion apparatus such as a chopper apparatus. - The arrangement of the
arm 20 will next be explained by referring toFIG. 1 . In the drawing, a section surrounded by a large dotted line will be referred to as an IGBT set 600. In the present embodiment, Each of thearms 20 inFIG. 5 has such an arrangement as shown by the IGBT set 600 inFIG. 1 . Awiring line FIG. 1 is connected to thewiring line midpoint 203 of the paired arms inFIG. 5 . In the drawing, the wiring has been expressed by such wiring lines. For the purpose of reducing a parasitic inductance, however, thewiring line wiring lines - The wiring lines 211 and 212 are connected with an
IGBT 1. When the conversion apparatus is of an AC-to-DC conversion type, aflywheel diode 2 is connected to theIGBT 1 in an inverse parallel thereto in polarity. The gate of eachIGBT 1 is connected to agate driver 16 via agate resistance 8. In this connection, thegate resistance 8 may be included in thegate driver 16. - An
overvoltage protection circuit 65 is connected between the collector of theIGBT 1 and the gate thereof. Theovervoltage protection circuit 65 includes a series circuit of clampingelement resistor 62 b and also includes aresistor 62 a connected between ajunction point 63 a and the gate of theIGBT 1. - Explanation will then be made as to the operation of the power conversion apparatus of the present embodiment. The
gate driver 16 supplies an ON/OFF pulse to theIGBT 1 to switch theIGBT 1 on the basis of asignal 7 received from an upper-level control system. When theIGBT 1 is turned ON or OFF, thearm 20 is turned ON or OFF to generate an AC voltage, and the generated AC voltage is applied to theload 22 having the inductance. The paired arms, for example, the arms 20(P) and 20(N) are not turned ON at the same time. - Attention will now be paid to a situation when the arms 20(N) and 20(P) are alternately turned ON and OFF, a drive signal to the arm 20(P) is put in its ON state and a drive signal to the arm 20(N) is put in its OFF state. When a current is flowing through a path from the
DC voltage source 21 via the arm 20(P) to theload 22 having the inductance and the arm 20(P) is turned OFF, a surge voltage is generated in the arm 20(P) at the wiringparasitic inductance 23 present in the path of a main circuit (DC voltage source 21→arm 20(P) →arm 20(N) →DC voltage source 21). And the surge voltage is superimposed on the voltage of theDC voltage source 21 and applied between the collector of theIGBT 1 and the emitter thereof. - By referring to
FIG. 9 , explanation will be made in detail as to waveforms of a collector voltage of theIGBT 1 and of a gate voltage thereof when theIGBT 1 is turned OFF. It is assumed that thegate driver 16 outputs an off pulse to turn OFF theIGBT 1. When thegate driver 16 outputs the OFF pulse, that is, a potential not exceeding a threshold of theIGBT 1; this causes electric charges so far accumulated in the gate of theIGBT 1 to be pulled out through agate resistance 8. This results in that agate voltage 32 of theIGBT 1 is reduced, theIGBT 1 shifts to its turn-off state, and a collector voltage (collector-to-emitter voltage) 31 rises. When thecollector voltage 31 of theIGBT 1 rises and becomes higher than the clamp voltage of the clampingelement 61 a, the clampingelement 61 a is conducted so that a charging current flows into the gate of theIGBT 1 through the clampingelement 61 a and theresistor 62 a, thus increasing thegate voltage 32. However, since the charging current is partly shunted into thegate driver 16, the charging current cannot sufficiently contribute to increasing the gate voltage. When the collector voltage of theIGBT 1 is further increased before the gate voltage of theIGBT 1 becomes sufficiently high, and when the collector voltage exceeds a total of the clamp voltages of the clampingelements element 61 b is also conducted so that the gate current can be supplied even through a path of the clampingelement 61 a, the clampingelement 61 b, and theresistor 62 b. Thus, when the gate voltage of theIGBT 1 is further increased to reduce the impedance of theIGBT 1, theIGBT 1 can be protected from an overvoltage. - When the resistive value of the
resistor 62 b is set to be larger than that of theresistor 62 a, the clamp voltage of the IGBT becomes high but theIGBT 1 can be protected from the overvoltage. When the overvoltage of theIGBT 1 is made high, the turn-off loss of the IGBT can be made small as a merit. - A second embodiment will next be explained. The present embodiment is directed to protecting the
IGBT 1 from an overvoltage by limiting a current shunted from a clamping element to a gate driver and supplying more gate charging current from the clamping element to the gate of theIGBT 1. - In the present embodiment, each
arm 20 inFIG. 5 has such an arrangement as shown by anIGBT set 600 inFIG. 2 . In the second embodiment, aresistor 19 is provided between aMOS FET 9 b and a low-voltageside power line 4 of agate driver 16 in an output stage of the gate driver. When aMOS FET 9 a is turned ON and theMOS FET 9 b is turned OFF, the gate potential of theIGBT 1 becomes a potential of a high-voltage side power line of thegate driver 16, the gate voltage of theIGBT 1 exceeds a threshold in such a manner that the IGBT is put in its ON state. When theMOS FET 9 a is turned OFF and theMOS FET 9 b is turned ON, on the other hand, charges are pulled out from the gate of theIGBT 1 via agate resistance 8 into thegate driver 16, so that theIGBT 1 is turned OFF and put in its OFF state. When theIGBT 1 is turned OFF, the collector voltage of theIGBT 1 increases, the clampingelement 61 a yields or is broken down, a current flows through the clampingelement 61 a and even into thegate driver 16. At this time, flowing of a current through theresistor 19 causes a potential difference to occur between both ends of theresistor 19. The occurrence of the potential difference between the both ends of theresistor 19 causes a source potential of theMOS FET 9 b to increase, with the result that a voltage between the gate and source of theMOS FET 9 b drops. Since the gate-to-source voltage drops, the saturation current of theMOS FET 9 b becomes small. The current flowing from the clampingelement 61 a is divided into the gate charging current of theIGBT 1 and into a current flowing into thegate driver 16 via theMOS FET 9 b. Since the saturation current of theMOS FET 9 b becomes small as mentioned above, the current flowing into thegate driver 16 is limited so that more current can be supplied to the gate of theIGBT 1. Accordingly, the IGBT can be protected more reliably from the overvoltage. - Although the
overvoltage protection circuit 65 is made up of a series circuit including theclamping elements resistor 62 a inFIG. 2 , theovervoltage protection circuit 65 may have such an arrangement as shown by theovervoltage protection circuit 65 inFIG. 1 . - The saturation current value of the
MOS FET 9 b is set more preferably as follows. - In an
IGBT set 600 similar in circuit arrangement to the IGBT set 600 inFIG. 2 but not having the overvoltage protection circuit preset therein, it is assumed that the maximum value of a current flowing through theMOS FET 9 b when the IGBT is turned OFF is defined as a normal turn-off current value. Then, when the saturation current value of theMOS FET 9 b is set not to be larger than the usual turn-off current value inFIG. 2 , more charging current can be supplied to the gate of theIGBT 1. - When the resistive value of the
resistor 19 is sufficiently small, the normal turn-off current value becomes nearly equal to a value obtained by dividing a potential difference (corresponding to a sum of voltages ofvoltage sources gate resistance 8. - Explanation will next be made as to a third embodiment. Even in the present embodiment, a current branched from a clamping element to a gate driver is limited to supply more gate charging current to the gate of an
IGBT 1, thus protecting theIGBT 1 from an overvoltage, similarly to the second embodiment. - In the present embodiment, each
arm 20 inFIG. 3 has such an arrangement as shown by the IGBT set 600 inFIG. 2 . The third embodiment is featured in that areactor 28 is connected between anovervoltage protection circuit 65 and agate driver 16. - When a
MOS FET 9 a is turned ON and aMOS FET 9 b is turned OFF in anoutput stage 17 of thegate driver 16, the gate potential of theIGBT 1 is a potential on the high-voltage side power line of the gate driver, the gate voltage of theIGBT 1 exceeds a threshold, whereby theIGBT 1 is put in its ON state. When theMOS FET 9 a is turned OFF and theMOS FET 9 b is turned ON, on the other hand, charges are pulled out from the gate of theIGBT 1 via agate resistance 8 to thegate driver 16, so that theIGBT 1 is turned OFF and put in its OFF state. When theIGBT 1 is turned OFF, the collector voltage of theIGBT 1 rises, a clampingelement 61 a yields or is broken down, and a current flows therethrough and even into thegate driver 16. - At this time, a current branched to the
reactor 28 is also increased. However, a voltage corresponding to a product of an increasing rate of the branched current and the inductance of thereactor 28 is applied between both ends of thereactor 28, so that a current branched to thegate driver 16 via thereactor 28 is limited. Accordingly, since more current is supplied to the gate of theIGBT 1, the IGBT can be protected more reliably from an overvoltage. - A time taken for a surge voltage to be applied to the IGBT is about 0.5 μs. When the current flowing into the gate driver is limited to about 8A, a relation, V=L*di/dt, is satisfied. Accordingly, when a voltage applied to the reactor is 15V, 15V=L*16A/1μs and hence L≈1μH. Thus when the inductance of the
reactor 28 is set at 1 μH or a higher value, this is effective for the protection of theIGBT 1 from overvoltage. - Although the
overvoltage protection circuit 65 is arranged in the form of a series circuit of clampingelements resistor 62 a inFIG. 3 , theovervoltage protection circuit 65 may have such an arrangement as shown by theovervoltage protection circuit 65 inFIG. 1 . - In a fourth embodiment, each
arm 20 inFIG. 5 has such an arrangement as shown by the IGBT set 600 inFIG. 4 . The fourth embodiment is featured in that alength 501 of wiring between anovervoltage protection circuit 65 and agate driver 16 is much longer than alength 500 of wiring between theovervoltage protection circuit 65 and the gate of anIGBT 1. When thelength 501 of wiring between theovervoltage protection circuit 65 and thegate driver 16 is longer, the parasitic inductance of the wiring can function similarly to thereactor 28 in the third embodiment. As a result the present embodiment can obtain effects similar to in the third embodiment. -
FIG. 7 shows, in a model form, the IGBT set 600 of the present embodiment installed. A package 10 (which will be referred to as theIGBT package 10, hereinafter) incorporating theIGBT 1 and theclamp diode 2 is mounted on acooling fin 101, and theovervoltage protection circuit 65 is mounted on theIGBT package 10. Although busbars connected to acollector terminal 234 and to anemitter terminal 233 are omitted inFIG. 7 , the respective busbars are actually provided on the overvoltage protection circuit 65 (theovervoltage protection circuit 65 being provided between the busbars and the package of the IGBT 1). Wiringlines gate driver 16 ad theIGBT package 10, the length ofwiring lines distance 501 of a wiring line between theovervoltage protection circuit 65 and thegate driver 16 is set to be much longer than thelength 500 of a wiring line between theovervoltage protection circuit 65 and the gate of theIGBT 1. Thus the present embodiment can achieve effects similar to theembodiment 3. When thewiring length 501 between theovervoltage protection circuit 65 and thegate driver 16 is set not to be smaller than about 1 m in turnaround distance, the inductance becomes about 1 μH or more, thus enabling achievement of more remarkable effects. - Since the length of the
wiring lines - Although the
overvoltage protection circuit 65 has such an arrangement as shown by a series circuit including theclamping elements resistor 62 b inFIG. 4 , theovervoltage protection circuit 65 may have such an arrangement as shown by theovervoltage protection circuit 65 inFIG. 1 . - A fifth embodiment is featured by
IGBTs 1 connected in series.FIG. 6 shows an arrangement of anarm 20 in the present embodiment. In the present embodiment, eacharm 20 inFIG. 5 corresponds to two of the IGBT sets 600 ofFIG. 6 connected in series. - When the
IGBTs 1 are connected in series, variations in the characteristics of elements cause one of the elements first turned OFF to receive the DC voltage, possibly resulting in that the element may become defective. If the IGBT can be reliably protected from an overvoltage, then a power conversion apparatus having IGBTs connected in series as a converter can be operated without causing any IGBT element to become defective. Accordingly, the overvoltage protection function of the IGBT is highly required, in particular, for a conversionapparatus having IGBTs 1 connected in series as a converter. - Since the arrangement of each IGBT set 600 in
FIG. 6 is the same as the arrangement of the IGBT set 600 inFIG. 1 , the IGBT can be protected from an overvoltage. - Even when the arrangement of the IGBT set 600 is replaced by the arrangement of FIGS. 2 to 4, the
IGBT 1 can be protected from the overvoltage as in theembodiments 2 to 4. Thus, the power conversion apparatus having the IGBTs connected in series as the converter can be operated without causing any IGBT element to become defective. - The arrangement of an upper/
lower arm 25 in a power converter of the present embodiment is shown inFIG. 8 . In the present embodiment, the power conversion apparatus is featured in that the apparatus is of a 3 level converter type. In a 2 level converter, when a P arm conductor is arranged to face an N arm conductor, compatibility can be achieved relatively easily between apparatus miniaturization and inductance reduction, and thegate driver 16 can be easily provided close to theIGBT 1. -
FIG. 10 shows an arrangement of the upper/lower arm 25 of the present embodiment. As shown inFIG. 11 , since the 3 level inverter requiresclamp diodes 3, this also requiresother wiring lines 213 to 215 in addition to thewiring lines IGBT 1 from an overvoltage, it is necessary to supply more charging current than that of the 2 level converter to the gate of theIGBT 1. - For this reason, when the IGBT set 600 in
FIG. 10 is designed to have such an arrangement as shown by the IGBT set 600 in FIGS. 1 to 4, the IGBT can be protected from the overvoltage. - When the IGBT set 600 is designed to have such an arrangement as in
FIG. 4 as an example, the length of thewiring line 501 can be made long and thegate driver 16 of theIGBT 1 can be installed at a location away from theIGBT 1. As a result, a degree of mounting flexibility can be increased, the inductance of the conductor can be easily reduced, and the IGBT can be easily protected from the overvoltage. - Even when the power conversion apparatus is of the 3 level converter type and has the
IGBTs 1 connected in series as inFIG. 11 , the arrangement of the IGBT set 600 as in FIGS. 1 to 4 enables the IGBT to be protected from the overvoltage. - In accordance with the present invention, there is provided a semiconductor power conversion apparatus which can suppress an overvoltage, in particular, upon switching operation.
- It should be further understood by those skilled in the art that although the foregoing description has been made on embodiments of the invention, the invention is not limited thereto and various changes and modifications may be made without departing from the spirit of the invention and the scope of the appended claims.
Claims (9)
1. A semiconductor power conversion apparatus comprising:
a MOS gate semiconductor; and
an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate thereof,
wherein the overvoltage protection circuit has a plurality of clamping elements connected in series and a resistor is connected to each of anodes of the plurality of clamping elements.
2. A semiconductor power conversion apparatus comprising:
a MOS gate semiconductor; and
an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate thereof,
wherein, as a current supplied from the overvoltage circuit is greater, a value of a saturation current of a semiconductor element at the output stage of a gate driver is smaller.
3. A semiconductor power conversion apparatus according to claim 2 , wherein said overvoltage protection circuit has a plurality of clamping elements connected in series, and a resistor is connected to each of anodes of the plurality of clamping elements.
4. A semiconductor power conversion apparatus comprising:
a MOS gate semiconductor; and
an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate thereof,
wherein a reactor is connected between the overvoltage protection circuit and a gate driver.
5. A semiconductor power conversion apparatus according to claim 4 , wherein said overvoltage protection circuit has a plurality of clamping elements connected in series, and a resistor is connected to each of anodes of the plurality of clamping elements.
6. A semiconductor power conversion apparatus comprising:
a MOS gate semiconductor; and
an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate thereof,
wherein a length of a wiring line between the overvoltage protection circuit and a gate driver is longer than a distance between the overvoltage protection circuit and a gate of an IGBT.
7. A semiconductor power conversion apparatus according to claim 6 , wherein said overvoltage protection circuit has a plurality of clamping elements connected in series, and a resistor is connected to each of anodes of the plurality of clamping elements.
8. A semiconductor power conversion apparatus comprising:
a MOS gate semiconductor; and
an overvoltage protection circuit connected between a collector of the MOS gate semiconductor and a gate thereof,
wherein a value of a current flowing into the gate is limited to a predetermined value.
9. A semiconductor power conversion apparatus according to claim 8 , wherein said predetermined current value is smaller than a value obtained by dividing a potential difference between an ON gate voltage and an OFF gate voltage by a resistive value of the gate.
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US12/870,309 US8213146B2 (en) | 2006-09-27 | 2010-08-27 | Semiconductor power conversion apparatus |
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JP2006-261653 | 2006-09-27 | ||
JP2006261653A JP4432953B2 (en) | 2006-09-27 | 2006-09-27 | Semiconductor power converter |
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US12/870,309 Continuation US8213146B2 (en) | 2006-09-27 | 2010-08-27 | Semiconductor power conversion apparatus |
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US11/861,500 Abandoned US20080084642A1 (en) | 2006-09-27 | 2007-09-26 | Semiconductor Power Conversion Apparatus |
US12/870,309 Expired - Fee Related US8213146B2 (en) | 2006-09-27 | 2010-08-27 | Semiconductor power conversion apparatus |
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US12/870,309 Expired - Fee Related US8213146B2 (en) | 2006-09-27 | 2010-08-27 | Semiconductor power conversion apparatus |
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US (2) | US20080084642A1 (en) |
JP (1) | JP4432953B2 (en) |
KR (1) | KR100977366B1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
KR20080028807A (en) | 2008-04-01 |
KR100977366B1 (en) | 2010-08-20 |
US8213146B2 (en) | 2012-07-03 |
JP4432953B2 (en) | 2010-03-17 |
US20100321847A1 (en) | 2010-12-23 |
JP2008086096A (en) | 2008-04-10 |
CN101154883B (en) | 2012-09-26 |
CN101154883A (en) | 2008-04-02 |
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