JP2012016206A - Method for detecting erroneous gate pulse wiring in power conversion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for detecting erroneous gate pulse wiring in a power conversion apparatus, making it possible to detect erroneous voltage detection wiring and erroneous switching wiring of arms due to operator's misunderstanding.SOLUTION: The power conversion apparatus, composed of plural semiconductor elements, has one end connected to a three-phase alternating-current power supply and the other end serving as direct current terminals, with a direct-current capacitor connected between the direct current terminals, and is provided with wiring for gate pulses to be applied from a control unit to the semiconductor elements. At one end of the power conversion apparatus, capacitors are connected between lines or in star form, and a reduced voltage is applied for a prescribed time to charge the direct-current capacitor before a gate pulse is applied in prescribed plural patterns from the control unit to the semiconductor elements. The currents in each phase of the three-phase alternating-current power supply at the time of pulse application are detected, and the relationship between the semiconductor elements to which the gate pulse was applied in plural patterns and the currents in each phase of the three-phase alternating-current power supply at this time is stored in memory. From the relationship stored in memory when wiring for gate pulses to be applied from the control unit to the semiconductor elements was sound and the relationship newly stored in memory by following the same procedure described above, an error in the wring used to apply gate pulses may be detected.

Description

  The present invention relates to a power conversion device that converts an AC power source and a DC power source, and more particularly, to a gate pulse miswiring detection method for a power conversion device.

  For example, there are many devices that connect a power converter to an AC power source and convert it to a DC power source, such as a motor drive, a UPS, a photovoltaic power converter, and a wind power converter.

  These power conversion devices perform a required power conversion operation by connecting a gate pulse signal generated by a control circuit to a semiconductor element which is a main circuit via individual control wirings and switching the semiconductor element.

  In order to reduce circuit loss in large-capacity power converters, the DC voltage is often selected at a high value, it is necessary to ensure insulation between the control circuit and the main circuit, and noise to the gate pulse signal wiring Insulation treatment of an optical cable or the like is often performed due to the necessity of interrupting current transmission.

  However, since the optical cable is individually wired to each semiconductor element, there is a concern that the optical cable may be erroneously connected even if sufficient care is taken during manufacture or inspection. If the gate pulse signal wiring is miswired, a PN short circuit occurs and the element is destroyed.

  In order to avoid this danger, in the process of device fabrication and assembly, the main circuit is set to a non-voltage state, first the gate pulse wiring reception confirmation test is performed, and it is confirmed that it is normal by visual inspection. We have taken steps to check the actual operation by charging the main circuit. However, the test process itself in the no-voltage state increases the test time. In addition, since the visual confirmation requires analysis technology at the time of malfunction, there are problems that testers are limited and become a bottleneck in the test process.

  On the other hand, there is one disclosed in Patent Document 1 as a power converter provided with a monitoring device for erroneous wiring, instead of entrusting erroneous wiring to human measures.

JP 2006-262599 A

  The concept of erroneous wiring detection in the monitoring device of Patent Document 1 is to detect the base emitter voltage and phase of a power transistor that constitutes an inverter, and detect erroneous wiring based on the difference from the normal state.

  By the way, in addition to the assembly scene at the time of new production, element replacement etc. may be performed due to circumstances after operation, but in this case, since it is a detection method at the element part, voltage detection wiring due to misunderstanding of the operator's arm and There is a possibility of miswiring the switching wiring. In such a case, effective detection cannot be performed by the method of Patent Document 1.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a gate pulse miswiring detection method for a power converter capable of detecting miswiring of voltage detection wiring and switching wiring due to misunderstanding of an arm of an operator. There is to do.

  The power conversion device of the present invention is formed of a plurality of semiconductor elements, one end is connected to a three-phase AC power supply, the other end is a DC terminal, a DC capacitor is connected between the DC terminals, and a gate is connected from the control device to the semiconductor element. It is equipped with wiring that gives a pulse, and a capacitor is connected between one end of the line or in a star shape, and a DC voltage is charged by applying a reduced voltage for a predetermined time, and then a gate pulse is applied from the control device to the semiconductor element in a predetermined pattern. Given this, each phase current of the three-phase alternating current is detected and the relationship between the semiconductor element to which the gate pulse is given in multiple patterns and each phase current of the three-phase alternating current at this time is stored. An erroneous wiring of the wiring to which the gate pulse is applied is detected from the stored relationship when the wiring to which the gate pulse is applied is healthy and the relationship stored this time by the same procedure.

  The plurality of semiconductor elements include three arms in which semiconductor elements are arranged above and below to form arms, the semiconductor elements of the arms are connected to each phase of the three-phase AC, and both ends of the arm are connected to DC terminals. In addition to the bridge configuration, each of the predetermined patterns has an ignition signal for each of the upper and lower semiconductor elements of different arms, and each semiconductor element has an ignition opportunity twice. It is better to have 6 firing patterns combined as given.

  Further, the reduced voltage is preferably such that the DC bus is charged with a low DC voltage in a range where the semiconductor element is not damaged even if a PN short circuit occurs.

  In addition, the gate pulse given to the semiconductor element after charging the DC capacitor does not cause damage to the semiconductor element even if a PN short circuit occurs. It is preferable to use a gate pulse signal with a time width.

  In addition, when detecting the incorrect wiring of the wiring that gives the gate pulse from the stored relationship when the wiring is healthy and the relationship stored this time by the same procedure, the normal current phase and the current current phase If there is a phase that does not match and a phase that does not match, it is better to estimate that there is a misconnection in the gate pulse wiring of the phase that does not match.

  In addition, when detecting an incorrect wiring of a wiring that gives a gate pulse from the stored relationship when the wiring is healthy and the relationship stored this time by the same procedure, if there is no actual current change, the gate pulse signal is It is good to judge that it is not connected.

  In addition, when detecting a miswiring of a wiring that gives a gate pulse from the stored relationship when the wiring is healthy and the relationship stored this time by the same procedure, a flow is seen in the phase that should originally flow. However, when all the polarities are reversed in the same phase, it is preferable to determine that all the polarities of the current detectors are reversed.

  It is possible to detect an incorrect wiring of the voltage detection wiring and the switching wiring due to the misunderstanding of the operator's arm.

The block diagram which shows the structure of the main circuit and control apparatus to which this invention is applied. The figure which shows each part waveform in the procedure of this invention at the time of normal wiring. The figure which shows the relationship between the input pattern of a gate pulse at the time of normal wiring, and current polarity. The block diagram which shows the structure of the main circuit at the time of incorrect wiring, and a control apparatus. The figure which shows each part waveform in the procedure of this invention at the time of incorrect wiring. The figure which shows the relationship between the input pattern of a gate pulse at the time of incorrect wiring, and current polarity. The figure which shows a work procedure flowchart.

  Embodiments of the present invention will be described below with reference to the drawings.

  Hereinafter, an example of a typical power conversion device to which the present invention is applied and a circuit and a device portion added by the present invention will be described.

  First, in FIG. 1, a power converter 20 to be subjected to erroneous wiring detection is composed of six sets of so-called bridge-connected semiconductor elements 8, and each arm composed of a series circuit of two sets of semiconductor elements 8. A connection point is connected to each phase of the three-phase system power 1, and a load 21 is connected to the DC circuit side at both ends of each arm of the three phases. Note that, on the AC side of the power converter 20, a reactor 6 is provided for each phase, and a capacitor 5 is provided between the phases to smooth the power waveform.

  In general, in addition to the system connection switch 4 connected to each phase of the three-phase system power 1 in the present invention, the auxiliary switch circuit 3 is connected in parallel to the normal power conversion device configured as described above. Is provided. The power converter 20 is configured to supply power by either the system connection switch 4 or the auxiliary switch circuit 3. The auxiliary switch circuit 3 has a switch and a resistor connected in series. As a result, when the auxiliary switch circuit 3 is selected and turned on, the AC voltage applied to the power converter is a reduced voltage.

The control device 14 of the present invention performs the AC / DC power conversion by performing the ignition control of the six sets of semiconductor elements 8 connected in a bridge for the device having the main circuit configuration as described above, and the erroneous wiring detection function. Fulfill. Controller 14, in order to fulfill the ignition control and miswiring detection function performs a switching control of the grid-connected switch 4 and the auxiliary switch circuit 3, the AC side phase currents _{I INU,} I _INV, to detect the _{I INW} Current detector 7 and a voltage detector for detecting the DC voltage Vdc, and an ignition control signal 9 for each semiconductor element 8 is provided. The voltage detector includes a series circuit of resistors 10 and 12 in the DC circuit, and detects the terminal voltage of the DC capacitor 11 provided in parallel with the resistor 10 as the DC voltage Vdc.

FIG. 2 shows the relationship between work procedures for detecting miswiring, input of each part of the control device when there is no miswiring, and firing signals. In the figure, the open / close state of the auxiliary switch circuit 3, the DC voltage Vdc, the gate pulse signal to the semiconductor element 8 (UP to WN), and the phase current values I _{inU to} I _inW observed by the current measuring device 7 are shown from the top. Yes. The six sets of semiconductor elements 8 connected in a bridge form the arm to which the semiconductor elements are connected, and thus each phase (U, V, W) of the three-phase system power 1, the upper stage (P) and the lower stage ( N) and a notation and a distinguishing symbol.

  As a work procedure for detecting erroneous wiring, first, the DC capacitor 11 is charged with a DC voltage that does not destroy the semiconductor element 8 even if a PN short circuit occurs. For this purpose, the auxiliary switch circuit 3 is connected to the three-phase system power 1 for a time T from time t1 to t2. The resistance value and the input period T of the auxiliary switch circuit 3 are selected so that the DC voltage is such that the semiconductor element 8 is not destroyed even if a PN short circuit occurs.

  Here, the DC voltage that does not destroy the semiconductor element 8 even if a PN short circuit occurs is determined as follows. For example, when the semiconductor element 8 is an IGBT (Insulated Gate Bipolar Transistor), the situation in which the semiconductor element 8 is broken is caused by a short-circuit damage caused by an overvoltage applied between the collector C and the emitter E, or between the collector C and the emitter E. Thermal damage due to overcurrent conduction is assumed.

What should be avoided in the present invention is overcurrent damage. In a situation where the semiconductor element 8 has a PN short circuit, the voltage Vdc across the DC capacitor 11, the wiring inductance Ldc connecting the P and N pairs (for example, WP and WN) of the semiconductor element 8, and the semiconductor element 8 The short circuit overcurrent Id is calculated from the ON voltage Eon and the elapsed time t from the start of the short circuit.

[Equation 1]
Id = (Vdc−Eon) · t / Ldc (1)

On the other hand, the semiconductor element 8 has a predetermined overcurrent withstand capability. For example, an IGBT with a rating of 1600A has an overcurrent withstand capability of 3200A and 1ms. From the above, the DC voltage Vdc to be charged in the DC capacitor 11 is set to be equal to or less than the value calculated from the overcurrent tolerance Id, the current confirmation time t, and the wiring inductance Ldc in the equation (1).

  Under the above environment, next, gate pulses are applied to the semiconductor element 8 in the following six patterns, and the semiconductor elements 8 are sequentially turned on. Note that the first requirement is that the time width of the gate pulse is equal to or less than the resonance period of the capacitor 5 and the reactor 7. This is intended to select a range where the oscillating current monotonously increases. Next, the second requirement is that the time from the start of energization and the data hold of the AD converter to the data acquisition of the AD converter is longer than the time. In the time between the first requirement and the second requirement, the actual gate pulse width is determined in consideration of the above-mentioned overcurrent tolerance.

  FIG. 2 shows gate pulses and measurement currents in each pattern when wiring is performed correctly. The response in each pattern is as follows.

First pattern P1: An ignition pulse is applied from the control device 14 to the semiconductor elements UP and VN. Therefore, in a situation where wiring is performed correctly, a circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element UP, the capacitor 5 and the semiconductor element VN. And this time, the current detector 7 for detecting the AC-side phase currents, _{I INU} the U-phase, _{-I INV} is detected to the V-phase. Here, the side that flows out of the semiconductor element is positive, and the side that flows in is negative.

Second pattern P2: An ignition pulse is applied from the control device 14 to the semiconductor elements UP and WN. Therefore, in a situation where wiring is performed correctly, a circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element UP, the capacitor 5 and the semiconductor element WN. At this time, the current detector 7 for detecting the AC side phase current detects I _{inU in} the U phase and −I _{inW in} the W phase.

Third pattern P3: An ignition pulse is applied from the control device 14 to the semiconductor elements UN and VP. Therefore, in a situation where wiring is performed correctly, a circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element VP, the capacitor 5 and the semiconductor element UN. And this time, the current detector 7 for detecting the AC-side phase currents, _-I the U-phase _{INU, I INV} is detected to the V-phase.

Fourth pattern P4: An ignition pulse is applied from the control device 14 to the semiconductor elements VP and WN. Therefore, in a situation where wiring is correctly performed, a circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element VP, the capacitor 5 and the semiconductor element WN. At this time, the current detector 7 for detecting the AC side phase current detects I _{inV in the V} phase and -I _{inW in} the W phase.

Fifth pattern P5: An ignition pulse is applied from the control device 14 to the semiconductor elements UN and WP. Therefore, in a situation where wiring is correctly performed, a circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element WP, the capacitor 5 and the semiconductor element UN. And this time, the current detector 7 for detecting the AC-side phase currents, _-I the U-phase _{INU, I INW} is detected in W phase.

Sixth pattern P6: An ignition pulse is applied from the control device 14 to the semiconductor elements WP and VN. Therefore, in a situation where wiring is performed correctly, a circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element WP, the capacitor 5 and the semiconductor element VN. And this time, the current detector 7 for detecting the AC-side phase currents, _{I INW} to W-phase, _{-I INV} is detected to the V-phase.

  FIG. 3 is a table summarizing the above relationships, the left column is the name of the semiconductor element recognized by the control circuit 14, and the third column from the left is actually connected on the semiconductor element 8 side. The name of the semiconductor element is shown. In this case, the same notation is used, which means that there is no miswiring. Therefore, in the patterns P1 to P6, the control circuit 14 can know in advance which phase AC voltage becomes positive and negative for each pattern. For example, in the case of the pattern P1, it is in a state where the U-phase current should be positive and the V-phase current should be negative, prepared in advance for each pattern. In the lower middle part, each phase current being X means that no current is detected (no current).

  On the other hand, if this pattern does not occur, what is the cause is that there is a PN short circuit besides miswiring, but for this problem, the auxiliary switch circuit 3 is turned on and the semiconductor element 8 is destroyed even if a PN short circuit occurs. Since a state in which the DC capacitor 11 is charged with a DC voltage not to be generated is created, it cannot be generated. At the initial stage of detecting miswiring, an environment is created that excludes the possibility of a PN short circuit.

  For this reason, when there is an incorrect wiring, it can be determined as an incorrect wiring from the following. FIG. 4 shows the same main circuit configuration, control device configuration, and input as FIG. 1, but there are miswirings. It is assumed that the control device 14 is intended to be output to the semiconductor element UP and pulsed to the VP due to miswiring, and that intended to be output to the semiconductor element VP is pulsed to the UP due to miswiring.

  FIG. 5 shows a gate pulse and a measurement current in each pattern when the wiring is incorrect. The response in each pattern is as follows.

  First pattern P1: An ignition pulse is applied to the semiconductor elements UP and VN from the control device 14, but since the ignition pulse is actually applied to VP instead of UP, a short circuit occurs between the semiconductor elements VP and VN. A circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element VP and the semiconductor element VN. At this time, since no current flows on the AC side, each phase current detector 7 does not detect current.

Second pattern P2: The control device 14 applies firing pulses to the semiconductor elements UP and WN. However, since the firing pulse is actually applied to VP instead of UP, from the DC capacitor 11, the semiconductor elements VP, A circuit returning to the DC capacitor 11 is formed via the capacitor 5 and the semiconductor element WN. At this time, the current detector 7 that detects the AC-side phase currents detects I _{inV for the V} phase and -I _{inW for} the W phase. In this case, current is detected, but it is not the phase that should flow.

  Third pattern P3: The control device 14 applies an ignition pulse to the semiconductor elements UN and VP. However, since the ignition pulse is actually applied to UP instead of VP, a short circuit occurs between the semiconductor elements UP and UN. A circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element UP and the semiconductor element UN. At this time, since no current flows on the AC side, each phase current detector 7 does not detect current.

Fourth pattern P4: The control device 14 applies the ignition pulse to the semiconductor elements VP and WN. However, since the ignition pulse is actually applied to UP instead of VP, the semiconductor element UP, A circuit returning to the DC capacitor 11 is formed via the capacitor 5 and the semiconductor element WN. And this time, the current detector 7 for detecting the AC-side phase currents, _{I INU} the U-phase, _{-I INW} is detected in W phase. In this case, a current is detected in the U phase, but it is not a phase that should flow.

Fifth pattern P5: An ignition pulse is applied from the control device 14 to the semiconductor elements UN and WP. In this case, since the wiring is performed correctly, a circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element WP, the capacitor 5 and the semiconductor element UN. And this time, the current detector 7 for detecting the AC-side phase currents, _-I the U-phase _{INU, I INW} is detected in W phase.

Sixth pattern P6: An ignition pulse is applied from the control device 14 to the semiconductor elements WP and VN. Also in this case, since the wiring is correctly performed, a circuit is formed from the DC capacitor 11 to the DC capacitor 11 via the semiconductor element WP, the capacitor 5, and the semiconductor element VN. And this time, the current detector 7 for detecting the AC-side phase currents, _{I INW} to W-phase, _{-I INV} is detected to the V-phase.

  FIG. 6 is a table summarizing the above relationships, the left column is the name of the semiconductor element recognized by the control circuit 14, and the third column from the left is actually connected on the semiconductor element 8 side. The name of the semiconductor element is shown. In this case, it means that an erroneous wiring is generated in which UP is VP and VP is UP.

The results of the current flow of each phase at this time are shown in the lower part of FIG. 6, but in short, pattern P1: none of the phases flow.
Pattern P2: V-phase positive and W-phase negative flow.
Pattern P3: No flow in any phase.
Pattern P4: U-phase positive and W-phase negative flow.
Pattern P5: W-phase positive and U-phase negative flow.
Pattern P6: W-phase positive and V-phase negative flow.
The result was obtained.

  By the way, the patterns P1 to P6 are obtained by giving an ignition signal to each semiconductor element twice. For example, in the case of UP, firing signals are given by patterns P1 and P2. If it is UN, the ignition signal is given by the patterns P3 and P5. Therefore, when this result is further evaluated from the side of the control circuit 14, the U-phase current flows in the patterns P1 and P2 that the control circuit 14 believes to be a semiconductor element UP and gives an ignition signal, both flowing twice. It can be seen that the result is not.

Similarly, the evaluation from the control circuit 14 side is as follows.
UP: Although the currents should flow in the patterns P1 and P2, the U-phase current is not flown twice.
UN: The patterns P3 and P5 should flow, but the U-phase current flows once and does not flow once.
VP: It should be flowing in patterns P3 and P4, but the V-phase current is not flowing both times.
VN: Although it should flow in patterns P1 and P6, the V-phase current flows once and does not flow once.
WP: Although it should be flowing in patterns P5 and P6, the W-phase current is flowing twice.
WN: Although it should be flowing in patterns P2 and P4, the W-phase current is flowing twice.

  From these results, it is found that there is a suspicion of miswiring between UP and VP that do not pass through twice. As described above, since the check result excludes the possibility of a PN short circuit, it may be considered as an incorrect wiring, and the location is considered as an incorrect wiring between UP and VP.

Furthermore, from the relationship between the semiconductor element that should have been ignited and the flow phase,
Pattern P2: An ignition signal is given to UP and a U-phase current should be obtained, but a positive current is detected in the V-phase.
Pattern P4: An ignition signal is given to VP and a V-phase current should be obtained, but a positive current is detected in the U-phase.
The relationship appears.

  This result also indicates that a miswiring between UP and VP is suspected.

  Note that when there is no flow in the three phases at the time of the patterns P1 and P3, there is a possibility that the wiring is not erroneously connected and there is a possibility of disconnection in other patterns. If it is included, it can be determined that it is not disconnected.

  In addition, current is seen in the phase that should be passed, but if the polarity is reversed in the same phase, it is considered that the polarity of the current detector is reversed.

  Based on the above description of the principle, in the present invention, detection of erroneous wiring is executed according to the flow of FIG.

  In detecting erroneous wiring, first, in step S101, the auxiliary switch circuit 3 of FIG. 4 is turned on for a short time to charge the DC capacitor 11 at a low voltage. This charging voltage is a DC voltage that does not destroy the semiconductor element 8 even if the PN short circuit described in the equation (1) occurs.

  Next, in step S102, ignition control is performed with the patterns P1 to P6 shown in FIGS. This pattern group consists of six elements that are combined so that each pattern is given an ignition signal to each of the upper and lower semiconductor elements of different arms, and each semiconductor element is given an opportunity to fire twice. A firing pattern is preferred.

  Next, in step S103, the output of the current detector 7 for detecting each phase current of the AC side in FIG. 4 is input and stored as a signal of detected phase and positive / negative polarity. The current detection timing is performed in synchronization with the semiconductor element firing timing in step S102, and the current is detected at the time timing when the ignition result flow is performed and stored in association with the pattern. In addition, although the direct-current voltage Vdc is also input into the control apparatus 14 of FIG. 4, this is used in order to confirm whether sufficient electric charge is hold | maintained at the direct-current capacitor 11. FIG. In other words, even if the ignition signal is given, sufficient charge is not held in the DC capacitor 11, and it is used to prevent erroneous wiring detection in a state where current cannot be expected.

  In step S104, the detection result in step 103 is taken into a microcomputer, for example. The microcomputer may be a control device or may be separately incorporated into a general purpose computer for evaluation.

  In step S105, the relation between the input pattern of the normal gate pulse and the current polarity in FIG. On the other hand, the relationship between the input pattern of the current gate pulse in FIG. 6 and the current polarity is created and stored from the data captured as the current detection result, and FIG. 3 and FIG. 6 are compared and collated.

  Finally, in step S106, a miswiring location is specified from this result. Since the identification logic has some methods described above, an erroneous wiring is identified from the difference between the patterns in FIGS. If normal, a message indicating normal is displayed in step S107, and if abnormal, a message indicating abnormality is displayed in step S108, and the process ends.

  The present invention can detect miswiring of a power conversion device with a simple device, and thus can be adopted regardless of the type of the power conversion device.

1: three-phase system power 3: auxiliary switch circuit 4: system connection switch 5: capacitor 6: reactor 8: semiconductor element 9: ignition control signal 10, 12: resistor 11: DC capacitor 14: controller 20: power converter 21: Load

Claims (7)

A wiring is formed of a plurality of semiconductor elements, one end is connected to a three-phase AC power source, the other end is a DC terminal, a DC capacitor is connected between the DC terminals, and a gate pulse is applied from the control device to the semiconductor element. In the power converter,
Capacitors are connected between one end of the lines or in a star shape, a reduced voltage is applied for a predetermined time to charge the DC capacitor, and then a gate pulse is applied from the control device to the semiconductor element in a predetermined plurality of patterns. Each phase current of the three-phase alternating current is detected, the relationship between the semiconductor element to which the gate pulse in the plurality of patterns is applied and each phase current of the three-phase alternating current at this time is stored, from the control device to the semiconductor element Gate pulse miswiring detection method for a power converter that detects miswiring of the wiring to which the gate pulse is applied from the stored relationship when the wiring to which the gate pulse is applied is healthy and the relationship stored this time by the same procedure . The gate pulse miswiring detection method for a power converter according to claim 1,
The plurality of semiconductor elements include a three-arm bridge in which arms are formed by arranging semiconductor elements above and below, connecting the semiconductor elements of the arms to each phase of the three-phase AC, and connecting both ends of the arm to a DC terminal. The predetermined plurality of patterns are different from each other in that each pattern gives an ignition signal to each of the upper and lower semiconductor elements of different arms, and each semiconductor element has an ignition opportunity twice. 6. A method for detecting an erroneous wiring of a gate pulse in a power conversion device, wherein six ignition patterns are combined as given. The gate pulse miswiring detection method for a power converter according to claim 1,
The reduced voltage is a gate pulse miswiring detection method for a power converter, characterized in that the DC bus is charged with a low DC voltage in a range in which a semiconductor element is not damaged even if a PN short circuit occurs. The gate pulse miswiring detection method for a power converter according to claim 1,
The gate pulse applied to the semiconductor element after charging the DC capacitor is a gate pulse signal having a time width equal to or less than half the time constant determined by the reactor and the capacitor of each phase of the three-phase AC. A method of detecting a gate pulse miswiring in a power converter. The gate pulse miswiring detection method for a power converter according to claim 1,
In detecting the incorrect wiring of the wiring that gives the gate pulse from the stored relationship when the wiring is healthy and the relationship stored this time by the same procedure, the current flowing phase and the current flowing phase are detected. When there is a phase that does not match and a phase that does not match, it is estimated that there is a misconnection in the gate pulse wiring of the phase that does not match, and a gate pulse miswiring detection method for a power converter, characterized in that: The gate pulse miswiring detection method for a power converter according to claim 1,
When detecting an incorrect wiring of the wiring that gives the gate pulse from the stored relationship when the wiring is healthy and the relationship stored this time by the same procedure, if there is no actual current change, the gate pulse signal is A gate pulse miswiring detection method for a power conversion device, characterized in that it is determined that they are not connected. The gate pulse miswiring detection method for a power converter according to claim 1,
In detecting an erroneous wiring of the wiring that gives the gate pulse from the stored relationship when the wiring is healthy and the relationship stored this time by the same procedure, there is a flow in the phase that should be flown through originally. A method for detecting an erroneous wiring of a gate pulse in a power converter, wherein, when the polarities are all reversed in the same phase, it is determined that the polarities of the current detectors are all reversed.

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