JP-7854794-B2 - Anomaly detection device, battery charging device, and anomaly detection method

Inventors

• 及川 崇
• 河村 安里

Assignees

• 新電元工業株式会社

Dates

Publication Date

20260507

Application Date

20211209

Claims (8)

1. A rectangular wave conversion unit converts the AC signals of each phase of a three-phase AC signal into a binarized rectangular wave signal based on whether the AC signals of each phase are above a predetermined threshold, An interference unit outputs an interference signal in which a rectangular wave signal of one other phase different from the current phase is interfered with the rectangular wave signal of each of the three phases, A smoothing unit generates smoothed signals for each phase by integrating and smoothing the interference signals for each phase output by the interference unit , A detection control unit detects an abnormality in the three-phase AC signal based on the voltage value of the smoothed signal of each phase smoothed by the smoothing unit. An anomaly detection device characterized by comprising:
2. The abnormality detection device according to claim 1 , characterized in that the detection control unit determines that the three-phase AC signal is normal when the voltage value of the smoothing signal for each phase is within a predetermined first voltage range.
3. The abnormality detection device according to claim 2, characterized in that the detection control unit determines that a short circuit to a power line has occurred in one of the AC signals of each phase if one of the voltage values of the smoothing signals of each phase is greater than or equal to a first threshold higher than the first voltage range, and one of the remaining voltage values of the smoothing signals is within a second voltage range lower than the first voltage range.
4. The detection control unit determines that a disconnection abnormality has occurred, in which one of the AC signals of each phase is disconnected, or a short-circuit abnormality has occurred, in which the remaining two phases are short-circuited, when one of the voltage values of the smoothing signals of each phase is above a second threshold, which is higher than the first voltage range, and the voltage values of the smoothing signals of the remaining two phases are both within a third voltage range, which is lower than the first voltage range. This is the abnormality detection device according to claim 3 or claim 3 .
5. The square wave conversion unit converts the AC signal of each phase into a square wave signal of each phase obtained by logically inverting the logical state of whether or not the AC signal of each phase is above a predetermined threshold , The aforementioned interfering portion is The system includes a first switch connected between the signal line of the first phase of the three-phase rectangular wave signal and the ground line, the signal line of the third phase of the rectangular wave signal connected to a control terminal, and the conduction state of the first switch being controlled according to the third phase rectangular wave signal, and a first interference unit that outputs an interference signal of the first phase that has been interfered with by the third phase rectangular wave signal, A second interference unit has a second switch connected between the signal line of the second phase of the three-phase rectangular wave signal and the ground line, the signal line of the first phase of the rectangular wave signal is connected to a control terminal, and the conduction state is controlled according to the first phase of the rectangular wave signal, and outputs an interference signal of the second phase that is interfered with by the first phase of the rectangular wave signal, The device comprises a third switch connected between the signal line of the third-phase rectangular wave signal and the ground line, the signal line of the second-phase rectangular wave signal connected to a control terminal, the conduction state of which is controlled according to the second-phase rectangular wave signal, and a third interference unit that outputs a third -phase interference signal that is interfered with by the second-phase rectangular wave signal, The smoothing section is, An anomaly detection device according to any one of claims 1 to 4, characterized in that it generates smoothed signals for each phase by integrating and smoothing the logic inverted signals of each phase of the interference signal of the first phase, the interference signal of the second phase, and the interference signal of the third phase.
6. The abnormality detection device according to any one of claims 1 to 5, wherein the rectangular wave conversion unit has a Zener diode that clamps the AC signal of each phase to a voltage below the input breakdown voltage, which indicates the breakdown voltage to the input terminal of the rectangular wave conversion unit, and converts the AC signal of each phase, which has been clamped to a voltage below the input breakdown voltage, into the rectangular wave signal of each phase .
7. An abnormality detection device according to any one of claims 1 to 6 , A rectifier unit supplies DC power, obtained by rectifying the three-phase AC signal output by the generator, to the battery as charging power, by conducting switch elements connected to each signal line of the three-phase AC signal output by the generator in accordance with the rotation of the rotor. The system includes a control unit that controls the conduction of the switch element so that the voltage of the DC power output by the rectifier unit becomes a predetermined voltage, The battery charging device is characterized in that the abnormality detection device detects abnormalities in the three-phase AC signal.
8. The rectangular wave conversion unit performs a rectangular wave conversion step in which it converts the AC signals of each phase of a three-phase AC signal into a binarized rectangular wave signal based on whether or not the AC signals of each phase are above a predetermined threshold , The interference unit outputs an interference signal in which the rectangular wave signal of each of the three phases is interfered with by one rectangular wave signal of another phase that is different from the current phase. The smoothing unit performs a smoothing step in which it integrates the interference signals of each phase output by the interference step to generate smoothed signals for each phase , A detection control step in which the detection control unit detects an abnormality in the three-phase AC signal based on the voltage value of the smoothed signal of each phase that has been smoothed by the smoothing step. An anomaly detection method characterized by including

Description

This invention relates to an anomaly detection device, a battery charging device, and an anomaly detection method. Techniques for detecting abnormalities in three-phase AC signals are known (see, for example, Patent Document 1). Another conventional technique for detecting abnormalities in three-phase AC signals is known, for example, a technique that detects abnormalities by detecting the waveform of the voltage obtained by dividing the signals of each phase of the three-phase AC signal by resistors, using an ADC (Analog-to-Digital Converter). Japanese Patent Application Laid-Open No. 62-131721 This block diagram shows an example of a battery charging device and an abnormality detection device according to this embodiment.This is a timing chart showing an example of the normal operation of the abnormality detection device according to this embodiment.This is a timing chart showing an example of the operation of the anomaly detection device according to this embodiment when it is in a junction state.This is a timing chart showing an example of the operation of the abnormality detection device according to this embodiment in the event of a ground fault.This timing chart shows an example of the operation of the abnormality detection device according to this embodiment in a correlated short-circuit state.This flowchart shows an example of the operation of the abnormality determination process of the abnormality detection device according to this embodiment. Hereinafter, an abnormality detection device, a battery charging device, and an abnormality detection method according to one embodiment of the present invention will be described with reference to the drawings. Figure 1 is a block diagram showing an example of a battery charging device 100 and an abnormality detection device 1 according to this embodiment. As shown in Figure 1, the battery charging device 100 comprises a generator 2, a rectifier 10, a U-phase driver 13, a V-phase driver 14, a W-phase driver 15, a square wave conversion unit 20, an interference unit 30, a smoothing unit 40, a control unit 50, and a battery 3. The battery charging device 100 is mounted on a vehicle such as a motorcycle and rectifies the AC power generated by the generator 2 to charge the battery 3. A load unit (not shown) is connected to the battery charging device 100, and the power generated by the generator 2 or the output power of the battery 3 is supplied to the load unit. Generator 2 is, for example, a three-phase AC generator, which generates electricity in accordance with the rotation of a rotor (not shown) and outputs three-phase AC power (three-phase AC signal) corresponding to the generated power. Here, the rotor is, for example, a crankshaft connected to the rotating shaft of an internal combustion engine (engine) of a motorcycle. The three-phase AC signal (three-phase AC signal) here is, for example, a U-phase, V-phase, and W-phase AC signal. Here, the signal line for the U-phase AC signal generated by generator 2 is connected to node N1, and the signal line for the V-phase AC signal generated by generator 2 is connected to node N2. Furthermore, the signal line for the W-phase AC signal generated by generator 2 is connected to node N3. Battery 3 is, for example, a lead-acid battery, and is connected between the signal line L1, which outputs the output voltage Vout of the rectifier unit 10, and the GND line L2 (ground line). The positive (+) electrode (positive terminal) of battery 3 is connected to the signal line L1 of the output voltage Vout, and the negative (-) electrode (negative terminal) is connected to the GND line L2. Battery 3 is charged by the power generated by the generator 2 supplied via the signal line L1, and the charged power is supplied to the load unit (not shown) via the signal line L1. The rectifier unit 10 outputs DC power by rectifying the three-phase AC power through the conduction of thyristors (11, 12) connected to each signal line of the three-phase AC signal output by the generator 2. The rectifier unit 10 comprises upper thyristors 11 (11-1 to 11-3) and lower thyristors 12 (12-1 to 12-3). Thyristors 11 and 12 are examples of switching elements. In this embodiment, thyristors 11-1, 11-2, and 11-3 each refer to the upper thyristor (upper switching element), and when referring to any upper thyristor provided by the rectifier unit 10, or when no particular distinction is made, they are referred to as thyristor 11. Furthermore, thyristors 12-1, 12-2, and 12-3 each refer to the lower thyristor (upper switching element), and when referring to any lower thyristor provided by the rectifier unit 10, or when no particular distinction is made, they are referred to as thyristor 12. Thyristor 11-1 is the upper switching element for the U-phase. Its anode terminal is connected to node N1, its cathode terminal is connected to signal line L1, and its control terminal (gate terminal) is connected to the signal line of the upper control signal of the U