WO2013077224A1 - インバータシステムの故障検知装置 - Google Patents
インバータシステムの故障検知装置 Download PDFInfo
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- WO2013077224A1 WO2013077224A1 PCT/JP2012/079388 JP2012079388W WO2013077224A1 WO 2013077224 A1 WO2013077224 A1 WO 2013077224A1 JP 2012079388 W JP2012079388 W JP 2012079388W WO 2013077224 A1 WO2013077224 A1 WO 2013077224A1
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- inverter circuit
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- inverter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
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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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2221/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof covered by H01L21/00
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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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
-
- 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
Definitions
- the present invention relates to a failure detection device that detects a failure in an inverter system including an inverter circuit and a motor driven by the inverter circuit, and more particularly, a current detection unit that detects a current flowing through the inverter circuit before starting the drive of the inverter system. And a failure detection device for an inverter system that can be manufactured easily and inexpensively.
- Conventional inverter circuit failure detection devices include a current detection means for detecting a current of an inverter circuit that drives a motor, an overcurrent determination circuit that determines an overcurrent from an output signal of the current detection means, and an output of the overcurrent determination circuit.
- An inverter output control circuit that controls the output of the inverter drive circuit that drives the inverter circuit by a signal, and forcibly energizes at least one phase of the motor coil for a predetermined time before the motor is driven to rotate by the inverter circuit; The current is detected by the current detection means, and it is determined whether or not the overcurrent determination circuit is overcurrent based on the output signal of the current detection means, and abnormality is determined from the output signal of the overcurrent determination circuit (for example, Patent Document 1). reference).
- a failure detection device of another inverter circuit a plurality of current detection means are provided to detect a failure of the current detection means, and the current detected by each current detection means is compared to obtain a current. Some also monitored the failure of the detection means.
- the circuit failure detection device since a plurality of current detection means for detecting a failure of the current detection means is required, the circuit becomes complicated and difficult to manufacture. In addition, since the number of parts increases, the manufacturing cost increases. In particular, when a shunt resistor is used as the current detection means, a highly accurate and expensive amplifier circuit is required to detect the current due to a small voltage drop in the shunt resistor, which increases the manufacturing cost.
- the problem to be solved by the present invention to cope with such problems is to detect a failure of the current detection means for detecting the current flowing in the inverter circuit before starting the drive of the inverter system, and then to detect the inverter circuit and
- An object of the present invention is to provide a failure detection device for an inverter system that can detect a failure of a motor coil and can be manufactured easily and inexpensively.
- an inverter system failure detection device detects an inverter system failure including an inverter circuit that converts input DC power into AC power and a motor driven by the inverter circuit.
- a failure detection device for an inverter system wherein a predetermined first test voltage is applied to a current detection means for detecting a current flowing through the inverter circuit in response to an input of a drive start signal of the inverter circuit.
- a predetermined first test voltage is applied to the current detection means in response to an input of a drive start signal of the inverter circuit, and the current detection means is based on the applied first test voltage.
- a predetermined second test voltage is applied to the inverter circuit and the motor, and the failure of the inverter circuit and the motor coil is determined based on the applied second test voltage.
- the control means may be configured such that the first test voltage amplified by the amplifier circuit provided in the current detection means is larger than the upper limit value of the voltage range determined in advance based on the first test voltage or the lower limit value. When the value is smaller than the value, it may be determined that the current detection unit is out of order.
- control means is configured such that the second test voltage amplified by the amplifier circuit provided in the current detection means is larger than a lower limit or a lower limit of a voltage range predetermined based on the second test voltage. When the value is smaller than the value, it may be determined that the inverter circuit and the motor coil are faulty.
- control means may determine that the inverter circuit and the motor coil are faulty when a predetermined time has elapsed from the start of application of the second test voltage.
- a predetermined first test voltage is applied to the current detection means in response to the input of the drive start signal of the inverter circuit, and based on the applied first test voltage.
- a predetermined second test voltage is applied to the inverter circuit and the motor, and the failure of the inverter circuit and the motor coil is determined based on the applied second test voltage.
- the number of parts is small, it can be manufactured at low cost.
- a shunt resistor is used as the current detection means, it is possible to manufacture at a low cost because only one highly accurate and expensive amplifier circuit is required to detect the current due to a small voltage drop across the shunt resistor. .
- control means is configured such that the first test voltage amplified by an amplifier circuit provided in the current detection means is greater than an upper limit value of a predetermined voltage range.
- the control means is configured such that the first test voltage amplified by an amplifier circuit provided in the current detection means is greater than an upper limit value of a predetermined voltage range.
- the value is smaller than the lower limit value, it is possible to determine the failure of the current detection means. Therefore, it is possible to reliably detect a failure of the current detection means.
- control means is configured such that the second test voltage amplified by the amplifier circuit provided in the current detection means is greater than an upper limit value of a predetermined voltage range.
- the control means is configured such that the second test voltage amplified by the amplifier circuit provided in the current detection means is greater than an upper limit value of a predetermined voltage range.
- control means can determine whether the inverter circuit and the motor coil are faulty when a predetermined time has elapsed from the start of application of the second test voltage. Therefore, the failure of the inverter circuit and the motor coil can be accurately determined.
- FIG. 1 It is a block diagram which shows embodiment of the failure detection apparatus of the inverter system by this invention. It is a flowchart explaining operation
- FIG. 1 is a block diagram showing an embodiment of a failure detection apparatus for an inverter system according to the present invention.
- the circuit shown as a block diagram in FIG. 1 shows a use state in which a failure detection device (hereinafter abbreviated as “failure detection device”) 1 of an inverter system according to the present invention is connected to an inverter circuit 2 as a failure detection target.
- the inverter circuit 2, the power source 3, and the drive start switch 4 are connected to the failure detection device 1, and the motor 5 is connected to the inverter circuit 2.
- the inverter circuit 2 is used for controlling the motor 5 and the like, and is a circuit that converts DC power supplied from the power source 3 into AC power.
- the power source 3 supplies DC power to the inverter circuit 2.
- the drive start switch 4 is a switch for starting drive control of the inverter circuit 2, and when the drive start switch 4 is turned on, a drive start signal Sig1 of the inverter circuit 2 is output.
- the drive start switch 4 may be a manual switch or an electronically controlled switch.
- a failure detection device 1 detects a failure in an inverter system including an inverter circuit 2 and a motor 5 driven thereby, and is connected to the inverter circuit 2 that drives the motor 5.
- the detection means 10, the test voltage application means 20, and the control means 30 are comprised.
- the current detection means 10 is connected to the ground side of the inverter circuit 2, that is, connected between the inverter circuit 2 and the ground, and detects a current flowing through the inverter circuit 2, and includes a shunt resistor 11 and an amplifier circuit. 12.
- the current detection means 10 may be connected to the power supply side of the inverter circuit 2, that is, between the inverter circuit 2 and the power supply 3.
- the shunt resistor 11 is connected in series to the ground side of the inverter circuit 2 and causes a voltage drop when a current flows through the inverter circuit 2.
- the resistance value of the shunt resistor 11 is determined according to the current flowing through the inverter circuit 2 and the circuit design.
- the amplifier circuit 12 is a differential amplifier circuit that amplifies the voltage difference before and after the shunt resistor 11 with a predetermined amplification factor, and is connected in parallel with the shunt resistor 11. Then, the amplified voltage is output to the control means 30 described later.
- the amplification factor is determined according to the current flowing through the inverter circuit 2 and the circuit design. Also, an operational amplifier can be used as the amplifier circuit 12.
- the test voltage application means 20 applies a predetermined first test voltage to the current detection means 10 and includes a battery 21 and a switch 22.
- the battery 21 is a power source that supplies a DC first test voltage to the current detection means 10, and is connected to the current detection means 10 via a switch 22.
- the battery 21 may be provided separately from the power source 3 that drives the inverter circuit 2, or the power source 3 may be used.
- the switch 22 is a switch controlled by the control means 30 described later, and the first test voltage is applied to the current detection means only while this switch is on. As the switch 22, a relay, a transistor, or the like can be used.
- the control means 30 controls the inverter circuit 2, determines a failure of the current detection means 10 based on the first test voltage applied to the current detection means 10 by the test voltage application means 20, and is predetermined for the inverter circuit 2.
- the second test voltage is applied, and failure of the inverter circuit 2 and the coil of the motor 5 (hereinafter abbreviated as “motor coil”) is determined based on the applied second test voltage.
- a microcomputer can be used. Moreover, it is good also as a structure which performs control of the inverter circuit 2, and determination of the failure of the inverter circuit 2 and a motor coil by a separate microcomputer.
- a drive start signal Sig1 is output from the drive start switch 4, and this drive start signal Sig1 is input to the control means 30 (FIG. 1). 2 step S1).
- the control unit 30 outputs the control signal Sig2 to the switch 22 and turns on the switch 22.
- the switch 22 is turned on, the first test voltage is applied from the battery 21 to the current detection means 10 (step S2).
- the first input voltage is output and input to the control means 30 (step S3).
- the control unit 30 compares the first input voltage with a predetermined voltage range based on the first test voltage (hereinafter referred to as “first voltage range”) (Ste S4).
- first voltage range a predetermined voltage range based on the first test voltage
- the process proceeds to the “No” side in the flowchart of FIG.
- the control unit 30 determines that the current detection unit 10 is out of order (step S5).
- the control means 30 outputs the control signal Sig3, turns off the switch 22, stops the application of the first test voltage, and stops the drive start control of the inverter circuit 2 (step S6).
- step S4 when the first input voltage is within the first voltage range, that is, when the first input voltage is less than or equal to the upper limit value of the range, Proceeding to the “Yes” side in the flowchart of FIG. 2, the control means 30 determines that the current detection means 10 is normal (step S7). Then, the control means 30 outputs the control signal Sig3, turns off the switch 22, and stops applying the first test voltage.
- the first voltage range is stored in a storage unit provided inside or outside the control unit 30.
- the control unit 30 can determine the failure of the current detection unit 10 based on the first test voltage applied to the current detection unit 10 by the test voltage application unit 20. Therefore, it is possible to detect a failure of the current detection means 10 before detecting a failure of the inverter circuit 2. Further, since there is only one current detecting means 10, the circuit is simple and can be easily manufactured, and the number of components is reduced, so that it can be manufactured at low cost. In particular, since only one expensive amplifier circuit 12 for detecting a minute voltage drop in the shunt resistor 11 is required, it can be manufactured at low cost. Furthermore, the control means 30 can determine the failure of the current detection means 10 regardless of whether the first input voltage is larger than the upper limit value of the first voltage range or smaller than the lower limit value. A failure of the detecting means 10 can be detected with certainty.
- control means 30 determines that the current detection means 10 is normal in step S7 in FIG. 2, the control means 30 outputs a control signal Sig4 to the inverter circuit 2 and applies a second test voltage to the inverter circuit 2 ( Step S8). Then, the current flowing through the inverter circuit 2 is detected by the current detection means 10, and a voltage drop occurs in the shunt resistor 11 due to this current flow, and the voltage difference before and after the shunt resistor 11 is amplified and amplified by the amplifier circuit 12.
- the second test voltage (hereinafter referred to as “second input voltage”) is output and input to the control means 30 (step S9).
- the control means 30 determines whether or not a predetermined time (hereinafter referred to as “energization time”) has elapsed since the start of application of the second test voltage (step S10). Proceed to the “No” side in the flowchart.
- energization time a predetermined time
- the process proceeds to “Yes”, and the second input voltage input when the energization time elapses and a voltage range predetermined based on the second test voltage (hereinafter referred to as “second”). 2 "voltage range”) (step S11).
- the control means 30 determines that the inverter circuit 2 has failed (step S12). And the control means 30 outputs control signal Sig5, stops application of a 2nd test voltage, and stops the drive start control of the inverter circuit 2 (step S6).
- step S11 when the second input voltage is within the second voltage range, that is, when the second input voltage is less than or equal to the upper limit value or the lower limit value of this range, The control unit 30 determines that the inverter circuit 2 is normal (step S13). Thereafter, the control means 30 outputs a control signal Sig6 and starts driving the inverter circuit 2 (step S14).
- the second voltage range and the energization time are stored in a storage means provided inside or outside the control means 30.
- the control unit 30 determines whether the inverter circuit 2 has failed even when the second input voltage is larger than the upper limit value of the second voltage range or smaller than the lower limit value. Can do. Therefore, the failure of the inverter circuit 2 can be reliably detected. Further, since the control means 30 can determine the failure of the inverter circuit 2 when the energization time of the second test voltage has elapsed, the second voltage range is appropriately set by setting the energization time in advance. Therefore, the failure of the inverter circuit 2 can be accurately determined.
- FIG. 3 is a schematic diagram of an inverter circuit 2 for driving a motor connected to the failure detection apparatus 1 shown in FIG.
- the motor 5 driven by the inverter circuit 2 is a three-phase brushless DC motor
- the inverter circuit 2 is a three-phase inverter circuit comprising six insulated gate bipolar transistors (hereinafter referred to as “IGBT”). It is.
- the circuit portion composed of two IGBTs connected vertically is hereinafter referred to as the U phase, the V phase, and the W phase from the left side of FIG. 3, and the motor 5 driven by the respective phases.
- the coils are referred to as a U-phase coil, a V-phase coil, and a W-phase coil (not shown), respectively.
- the operation of the failure detection apparatus 1 is as described above, but when the motor 5 is driven by the inverter circuit 2, the voltage range based on the second test voltage when detecting the failure of the inverter circuit 2 is: Based on the energization time of the second test voltage, it can be determined as follows.
- FIG. 4 is a table summarizing the IGBT to be energized when detecting the short circuit of the inverter circuit 2 in FIG. 3, the determination result of the current for each IGBT by the control means 30, and the detection result of the short circuit corresponding to the determination result. It is.
- the control means 30 shown in FIG. 1 energizes the lower U-phase IGBT (applies a second test voltage), and the current detection means 10 detects the current flowing through the IGBT.
- the detected current is determined as an overcurrent by the control means 30, a short circuit on the upper side of the U phase can be detected.
- the control unit 30 sets the U-phase upper IGBT to normal. Determine and stop energization.
- the control means 30 When it is determined that the U-phase upper IGBT is normal, the control means 30 energizes (applies the second test voltage) to the V-phase lower IGBT. Then, the current flowing through the IGBT is detected by the current detection means 10, and the control means 30 determines whether or not the detected current is an overcurrent. When this current is determined to be an overcurrent, a short circuit on the upper side of the V phase is detected, and when it is determined that the current is within a predetermined current range (the second input voltage is within the second voltage range). The control means 30 determines that the IGBT on the upper side of the V phase is normal, and stops energization.
- each IGBT in the inverter circuit 2 can be detected by sequentially performing this operation on all six IGBTs.
- each IGBT is energized in the order of the lower U phase, the lower V phase, the lower W phase, the upper U phase, the upper V phase, and the upper W phase, but this order is arbitrary.
- a short circuit of the IGBT on the lower side of that phase can be detected, and when the IGBT on the lower side of each phase of the inverter circuit 2 is energized, A short circuit of the IGBT on the upper side of the phase can be detected.
- FIG. 5 corresponds to the determination result of the current between the IGBTs to be energized and between each IGBT by the control means 30 when detecting a short circuit of each phase coil of the inverter circuit 2 and the motor 5 in FIG. It is the table
- control means 30 for example, between the U phase upper side and the V phase lower side, between the U phase upper side and the W phase lower side, between the V phase upper side and the U phase lower side, between the V phase upper side and the W phase.
- the IGBT between the lower side, the upper side of the W phase and the lower side of the U phase, and the upper side of the W phase and the lower side of the V phase are sequentially energized (the application of the second test voltage).
- the phase between the U-phase upper side and the V-phase lower side, the U-phase upper side and the W-phase lower side, the V-phase upper side and the U-phase lower side, and the W-phase upper side It is determined that the current flowing through the IGBT between the lower side of the U phase and the lower side of the U phase is approximately twice the predetermined current (the second input voltage is approximately twice the second voltage range), and the upper side of the V phase and the lower side of the W phase And the current flowing in the IGBT between the W phase upper side and the V phase lower side is within a predetermined current range (the second input voltage is within the second voltage range).
- FIG. 6 corresponds to the determination result of the energization between the IGBTs to be energized and between the IGBTs by the control means 30 when detecting the disconnection of each phase coil of the inverter circuit 2 and the motor 5 in FIG. It is the table
- control means 30 for example, between the U phase upper side and the V phase lower side of the inverter circuit 2, between the U phase upper side and the W phase lower side, between the V phase upper side and the U phase lower side, between the V phase upper side and the W phase.
- the IGBT between the lower side, the upper side of the W phase and the lower side of the U phase, and the upper side of the W phase and the lower side of the V phase are sequentially energized (the application of the second test voltage).
- second input voltage 0V
- disconnection of the U-phase coil of the motor 5 can be detected.
- the order of the energization is arbitrary. Note that “energization” in the energization result of FIG. 6 means that a current flows between each IGBT, and it does not matter whether the current is an overcurrent.
- the above detection methods can be used alone or in combination of any two or more.
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- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Inverter Devices (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
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Abstract
Description
2…インバータ回路
3…電源
4…駆動開始スイッチ
5…モータ
10…電流検出手段
11…シャント抵抗
12…増幅回路
20…試験電圧印加手段
21…バッテリ
22…スイッチ
30…制御手段
図1は本発明によるインバータシステムの故障検知装置の実施形態を示すブロック図である。図1にブロック図として示した回路は、本発明によるインバータシステムの故障検知装置(以下、「故障検知装置」と略称する)1を故障検知の対象としてのインバータ回路2に接続した使用状態を示すもので、インバータ回路2と、電源3と、駆動開始スイッチ4とが、故障検知装置1に接続されており、前記インバータ回路2にはモータ5が接続されている。インバータ回路2は、モータ5等の制御に用いられるものであり、電源3から供給される直流電力を交流電力に変換する回路である。電源3は、インバータ回路2に直流電力を供給するものである。駆動開始スイッチ4は、インバータ回路2の駆動制御を開始するためのスイッチであり、駆動開始スイッチ4をオンにすることにより、インバータ回路2の駆動開始信号Sig1が出力される。駆動開始スイッチ4は、手動のスイッチでも電子制御のスイッチでもよい。
図1に示す電流検出手段10が正常と判定された後、インバータ回路2の故障を検知する際には、6つのIGBTに順番に通電することにより、どのIGBTに短絡があるのかを検知することができる。図4は、図3におけるインバータ回路2の短絡を検知する際の通電するIGBTと、制御手段30による各IGBT毎の電流の判定結果と、判定結果に対応する短絡の検知結果とをまとめた表である。
次に、図1に示す電流検出手段10が正常と判定された後、インバータ回路2の故障を検知する際には、6つのIGBT間に順番に通電することにより、各IGBTにおける短絡、各IGBT間における短絡及びモータ5の各相コイルの短絡を検知することができる。図5は、図3におけるインバータ回路2及びモータ5の各相コイルの短絡を検知する際の、通電するIGBT間と、制御手段30による各IGBT間毎の電流の判定結果と、判定結果に対応する短絡の検知結果とをまとめた表である。
次に、図1に示す電流検出手段10が正常と判定された後、インバータ回路2の故障を検知する際には、6つのIGBT間に順番に通電することにより、各IGBTにおける断線及びモータ5の各相コイルの断線を検知することができる。図6は、図3におけるインバータ回路2及びモータ5の各相コイルの断線を検知する際の、通電するIGBT間と、制御手段30による各IGBT間毎の通電の判定結果と、判定結果に対応する断線の検知結果とをまとめた表である。
Claims (4)
- 入力した直流電力を交流電力に変換するインバータ回路と、このインバータ回路により駆動されるモータとを含むインバータシステムの故障を検知するインバータシステムの故障検知装置であって、
前記インバータ回路の駆動開始信号の入力に応じて、前記インバータ回路に流れる電流を検出する電流検出手段に対し、予め定められた第1試験電圧を試験電圧印加手段で印加し、該印加された第1試験電圧に基づいて前記電流検出手段の故障を判定し、
前記インバータ回路及びモータに対し、予め定められた第2試験電圧を制御手段で印加し、該印加された第2試験電圧に基づいて前記インバータ回路及びモータコイルの故障を判定することにより、
前記インバータシステムの駆動開始前に、前記電流検出手段の故障を判定し、その後前記インバータ回路及びモータコイルの故障を判定するようにしたことを特徴とするインバータシステムの故障検知装置。 - 前記制御手段は、前記電流検出手段に備えられた増幅回路により増幅された前記第1試験電圧が、第1試験電圧に基づき予め定められた電圧の範囲の上限値よりも大きいか或いは下限値よりも小さい場合に、前記電流検出手段の故障と判定することを特徴とする請求項1に記載のインバータシステムの故障検知装置。
- 前記制御手段は、前記電流検出手段に備えられた増幅回路により増幅された前記第2試験電圧が、第2試験電圧に基づき予め定められた電圧の範囲の上限値よりも大きいか或いは下限値よりも小さい場合に、前記インバータ回路及びモータコイルの故障と判定することを特徴とする請求項1に記載のインバータシステムの故障検知装置。
- 前記制御手段は、前記第2試験電圧の印加開始から予め定められた時間を経過した時に、インバータ回路及びモータコイルの故障を判定することを特徴とする請求項1~3のいずれか1項に記載のインバータシステムの故障検知装置。
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US14/359,872 US9360515B2 (en) | 2011-11-21 | 2012-11-13 | Fault detection device for inverter system |
DE112012004834.2T DE112012004834T5 (de) | 2011-11-21 | 2012-11-13 | Fehlererkennungsvorrichtung für eine Wechselrichterschaltung |
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