WO2023162097A1 - Circuit de détection de surtension - Google Patents

Circuit de détection de surtension Download PDF

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Publication number
WO2023162097A1
WO2023162097A1 PCT/JP2022/007669 JP2022007669W WO2023162097A1 WO 2023162097 A1 WO2023162097 A1 WO 2023162097A1 JP 2022007669 W JP2022007669 W JP 2022007669W WO 2023162097 A1 WO2023162097 A1 WO 2023162097A1
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WO
WIPO (PCT)
Prior art keywords
circuit
power supply
detection circuit
bus
overvoltage detection
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Application number
PCT/JP2022/007669
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English (en)
Japanese (ja)
Inventor
和寛 山田
啓介 植村
幹幸 谷口
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2022/007669 priority Critical patent/WO2023162097A1/fr
Priority to JP2024502341A priority patent/JPWO2023162097A1/ja
Publication of WO2023162097A1 publication Critical patent/WO2023162097A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

Definitions

  • the present disclosure relates to an overvoltage detection circuit for protecting a power supply circuit from surge voltage.
  • Patent document 1 has a first comparison circuit for high-speed response and a second comparison circuit for low-speed response. A configuration is disclosed in which the set voltage is increased for frequencies higher than the frequency. Further, Patent Document 1 discloses a configuration in which an overvoltage detection circuit is given time response characteristics, and the set voltage is set low for a long operating time and set high for a short operating time. .
  • the present disclosure has been made in view of the above, and in areas where the power supply voltage is unstable, the power supply circuit is protected from surge voltages, which are steep overvoltages superimposed on the power supply voltage, and long-term rises in the power supply voltage. It is an object to obtain an overvoltage detection circuit for protection.
  • an overvoltage detection circuit includes a bus voltage detection circuit that detects a bus voltage, and a bus voltage detected by the bus voltage detection circuit for a first delay time.
  • a first delay circuit that delays by the first delay circuit, a first comparison unit that outputs a first comparison result obtained by comparing the bus voltage delayed by the first delay circuit and the first cutoff threshold, and a power supply a power supply voltage detection circuit that detects a voltage;
  • a second delay circuit that delays the power supply voltage detected by the power supply voltage detection circuit by a second delay time; a second comparison unit that outputs a second comparison result obtained by comparing the cutoff threshold; a first comparison result output from the first comparison unit and a second comparison result output from the second comparison unit 2, and a relay for switching ON/OFF of the power reception of the outdoor unit from the AC power supply.
  • the first delay time is longer than the second delay time.
  • the first blocking threshold is lower than the second blocking threshold.
  • the overvoltage detection circuit according to the present disclosure is said to be able to protect the power supply circuit from surge voltages, which are steep overvoltages superimposed on the power supply voltage, and long-term rises in the power supply voltage, in regions where the power supply voltage is unstable. Effective.
  • FIG. 1 is a diagram showing the configuration of an air conditioner according to Embodiment 1.
  • Waveform of power supply voltage rising for a long time and time chart of relay control signal Waveform of steep surge voltage in power supply system and time chart of relay control signal 4 is a flow chart showing the procedure of operations performed by the air conditioner according to Embodiment 1.
  • FIG. 4 shows a configuration of an overvoltage detection circuit according to a second embodiment;
  • FIG. 4 is a diagram showing a processor when part or all of a control unit of the outdoor unit of the air conditioner according to Embodiment 1 is realized by the processor;
  • FIG. 4 is a diagram showing a processing circuit when part or all of a control unit of the outdoor unit of the air conditioner according to Embodiment 1 is realized by the processing circuit;
  • FIG. 1 is a diagram showing the configuration of an air conditioner 1 according to Embodiment 1. As shown in FIG. Although the details will be described later, the air conditioner 1 has an overvoltage detection circuit.
  • the air conditioner 1 has an indoor unit 2 and an outdoor unit 3 .
  • the indoor unit 2 has a terminal block 21 , a converter circuit 22 , a smoothing capacitor 23 , a bus voltage detection circuit 24 , an indoor unit control circuit 25 , a relay 26 and a serial communication circuit 27 .
  • the indoor unit control circuit 25 controls the fan of the indoor unit 2 , processes signals from a remote controller or the like, and communicates with the outdoor unit 3 .
  • the fan and remote controller mentioned above are not shown in FIG.
  • FIG. 1 also shows an AC power supply 50 that supplies power to the air conditioner 1 .
  • AC power supply 50 applies power supply voltage to air conditioner 1 .
  • the outdoor unit 3 includes a terminal block 20, a relay 4, a converter circuit 5, a smoothing capacitor 6, a bus voltage detection circuit 7, an inverter circuit 8, a compressor 9, a relay 10, and a serial communication circuit 11. , a bus overvoltage detection circuit 14 , a power supply overvoltage detection circuit 12 , a control section 15 , a relay control circuit 13 and a current detection circuit 19 .
  • the terminal block 20 is connected to the converter circuit 5 of the outdoor unit 3 via the relay 4.
  • the terminal block 20 is also connected to the AC power supply 50 in parallel with the indoor unit 2 .
  • the relay 4 is composed of a so-called A contact relay. One end of the relay 4 is connected to the AC power supply 50 via the terminal block 20 . The other end of relay 4 is connected to converter circuit 5 .
  • the converter circuit 5 has a rectifier circuit 51 and a power factor improvement circuit 52, and converts alternating current to direct current.
  • the rectifier circuit 51 is composed of, for example, a diode bridge circuit.
  • the power factor correction circuit 52 is composed of, for example, a boost chopper circuit.
  • the converter circuit 5 is connected to the smoothing capacitor 6 .
  • the control unit 15 has a converter control unit 16 for controlling the power factor correction circuit 52, and a relay control unit for controlling ON/OFF of the relay 4 based on the value from the bus voltage detection circuit 7 for detecting the bus voltage. and an inverter control unit 18 that controls the inverter circuit 8 based on the command from the serial communication circuit 11 of the outdoor unit 3 and the value from the current detection circuit 19 .
  • the control unit 15 has a function of outputting a switching determination signal regarding switching determination between ON and OFF of the relay control circuit 13 based on the bus voltage detected by the bus voltage detection circuit 7 .
  • the control unit 15 further has a function of detecting the on/off state of the relay control circuit 13 .
  • the relay 10 is composed of a so-called C-contact relay.
  • the relay 10 is connected to the AC power supply 50 via the indoor unit 2 when the coil is not energized.
  • the relay 10 is connected to the serial communication circuit 11 when the coil is energized by the control signal from the control unit 15 , so that the serial communication circuit 11 can communicate with the serial communication circuit 27 of the indoor unit 2 .
  • FIG. 2 is a circuit diagram showing the details of the power supply overvoltage detection circuit 12, the bus overvoltage detection circuit 14, the relay control unit 17, and the relay control circuit 13 included in the air conditioner 1 according to Embodiment 1. Furthermore, FIG. 2 shows the configuration of the overvoltage detection circuit according to the first embodiment. FIG. 2 also shows components other than the power supply overvoltage detection circuit 12, the bus overvoltage detection circuit 14, the relay control unit 17, and the relay control circuit 13 among all the components of the outdoor unit 3 of the air conditioner 1. ing. Also shown in FIG. 2 is an AC power supply 50 .
  • the power supply overvoltage detection circuit 12 has an overvoltage detection section 30 that is a second comparison section, a second delay circuit 31, and a power supply voltage detection circuit 32 that detects the power supply voltage.
  • the overvoltage detector 30 has a comparator 30a, resistors R8, R9, R10, and a capacitor C4.
  • the resistors R8 and R9 are connected in series between the comparator power supply voltage 30b and the ground potential, divide the voltage of the comparator power supply voltage 30b, and apply it to the comparator 30a.
  • the capacitor C4 is connected as a bypass capacitor between the comparator power supply voltage 30b and the ground potential.
  • the output of the comparator 30a is connected to the pull-up voltage 30c through the resistor R10 and to the relay control circuit 13.
  • the second delay circuit 31 constitutes an integrating circuit having a resistor R7 and a capacitor C3.
  • the output node of the second delay circuit 31 is connected to the comparator 30 a of the overvoltage detection section 30 , and the input node of the second delay circuit 31 is connected to the power supply voltage detection circuit 32 .
  • the second delay circuit 31 delays the power supply voltage detected by the power supply voltage detection circuit 32 by a second delay time.
  • the overvoltage detection unit 30 outputs a second comparison result obtained by comparing the power supply voltage delayed by the second delay circuit 31 and the second cutoff threshold.
  • the power supply voltage detection circuit 32 has resistors R5, R6, R15 and diodes D1, D2.
  • One end of resistor R5 is connected to relay 4 and converter circuit 5, and the other end of resistor R5 is connected to the anode of diode D1.
  • One end of the resistor R6 is connected to the AC power supply 50, and the other end of the resistor R6 is connected to the anode of the diode D2.
  • the cathode of diode D1 is connected to the cathode of diode D2.
  • a cathode of the diode D1 and a cathode of the diode D2 are connected to one end of the resistor R15 and also to the second delay circuit 31 .
  • the other end of the resistor R15 is connected to the ground potential.
  • the bus overvoltage detection circuit 14 has an overvoltage detection section 28 as a first comparison section and a first delay circuit 29 .
  • the overvoltage detector 28 has a comparator 28a, resistors R2, R3, R4, and a capacitor C2.
  • the resistors R2 and R3 are connected in series between the comparator power supply voltage 28b and the ground potential, divide the voltage of the comparator power supply voltage 28b, and apply it to the comparator 28a.
  • the capacitor C2 is connected as a bypass capacitor between the comparator power supply voltage 28b and the ground potential.
  • the output of comparator 28a is connected to pull-up voltage 28c through resistor R4.
  • the first delay circuit 29 constitutes an integrating circuit having a resistor R1 and a capacitor C1.
  • the capacitance value of the capacitor C1 is larger than the capacitance value of the capacitor C3 included in the second delay circuit 31 .
  • the output node of the first delay circuit 29 is connected to the comparator 28 a and the input node of the first delay circuit 29 is connected to the bus voltage detection circuit 7 .
  • the first delay circuit 29 delays the bus voltage detected by the bus voltage detection circuit 7 by a first delay time.
  • the overvoltage detector 28 outputs a first comparison result obtained by comparing the bus voltage delayed by the first delay circuit 29 and the first cutoff threshold. Based on the first comparison result output from the overvoltage detection unit 28 and the second comparison result output from the overvoltage detection unit 30, the relay 4 turns on and off power reception of the outdoor unit 3 from the AC power supply 50. switch between
  • the outdoor unit 3 further has resistors R11 and R12.
  • the relay control unit 17 is connected to the bus voltage detection circuit 7 for reading the value of the bus voltage, and is connected to the relay control circuit 13 via the resistor R11 for reading the relay control state. Also, the relay control unit 17 is connected to the relay control circuit 13 via a resistor R12 in order to open and close the relay 4 by software control.
  • the relay control circuit 13 is a circuit that switches ON and OFF of power reception from the AC power supply 50, and has a transistor Q1 and resistors R13 and R14. Based on the first comparison result output from the overvoltage detection unit 28, the second comparison result output from the overvoltage detection unit 30, and the switching determination signal output from the control unit 15, the transistor Q1 is relayed. 4 is a driving transistor. The output of the overvoltage detection section 28, the output of the overvoltage detection section 30, and the output of the relay control section 17 are connected to the base terminal of the transistor Q1.
  • a resistor R13 is connected to the base of the transistor Q1, and a resistor R14 is connected between the base and emitter of the transistor Q1.
  • the outdoor unit 3 further has a diode D3. One end of the diode D3 is connected to the relay control circuit 13 and the other end of the diode D3 is connected to the control section 15 .
  • a coil portion 4a of the relay 4 is connected in parallel with the diode D3. That is, one end of the coil portion 4a is connected to the control portion 15, and the other end of the coil portion 4a is connected to the collector of the transistor Q1.
  • the overvoltage detection circuit includes a bus voltage detection circuit 7, a first delay circuit 29, a comparator 28a, a power supply voltage detection circuit 32, a second delay circuit 31, a comparator 30a, a relay 4.
  • the relay 26 is turned off under the control of the indoor unit control circuit 25 of the indoor unit 2 .
  • a relay 10 of the outdoor unit 3 is connected to the serial communication circuit 11 by a control signal from the control section 15 .
  • the relay 4 is in an ON state under the control of the relay control circuit 13 , so that the converter circuit 5 is directly fed from the AC power supply 50 .
  • FIG. 3 is a time chart of the waveform of the power supply voltage rising over a long period of time and the relay control signal.
  • FIG. 3 shows how the relay control state, the power supply overvoltage detection circuit 12, the bus overvoltage detection circuit 14, the relay control signals of the relay control section 17, and the power supply voltage change over time.
  • the output voltage of the bus voltage detection circuit 7 increases.
  • the rise of the output voltage is delayed by the first delay circuit 29 of the bus overvoltage detection circuit 14, but when the output voltage exceeds the midpoint potential of the resistors R2 and R3 connected in series, the comparator 28a Since the output becomes Low and the potential becomes the ground potential, the transistor Q1 of the relay control circuit 13 is turned off and the relay 4 is cut off, thereby protecting the circuit after the relay 4 from overvoltage.
  • Fig. 4 is a time chart of the waveform of the steep surge voltage of the power supply system and the relay control signal.
  • FIG. 4 shows how the relay control state, the power supply overvoltage detection circuit 12, the bus overvoltage detection circuit 14, the relay control signals of the relay control section 17, and the power supply voltage change over time.
  • the voltage detected by the power supply voltage detection circuit 32 of the power supply overvoltage detection circuit 12 sharply rises.
  • the steep rise in voltage is delayed by the second delay circuit 31, but when the voltage exceeds the potential at the middle point of the resistors R8 and R9 connected in series, the output of the comparator 30a goes low and the potential drops. Since the ground potential is reached, the transistor Q1 of the relay control circuit 13 is turned off, and the relay 4 is cut off, thereby protecting the circuit after the relay 4 from overvoltage.
  • the smoothing capacitor 6 discharges, the bus voltage drops below a predetermined voltage, and the function of the outdoor unit 3 stops.
  • the smoothing capacitor 6 is a bus capacitor.
  • the delay time used by the second delay circuit 31 of the power supply overvoltage detection circuit 12 is shorter than the delay time used by the first delay circuit 29 of the bus overvoltage detection circuit 14, and the overvoltage of the power supply overvoltage detection circuit 12 is reduced.
  • the converter circuit 5, which is a power supply circuit is protected from an overvoltage surge superimposed on the power supply voltage. can be done. Furthermore, it is possible to protect the electronic circuit from a long-term rise in the power supply voltage and the rise in the bus voltage that approach the breakdown voltage rating of the circuit components.
  • the electronic circuit of the outdoor unit 3 does not need to use parts rated for a voltage higher than necessary, so that the cost of the parts can be reduced. Therefore, in Embodiment 1, the delay time used by the second delay circuit 31 is set shorter than the delay time used by the first delay circuit 29, and the cutoff threshold used by the overvoltage detector 30 is set to overvoltage detection It is set higher than the cut-off threshold used by unit 28 .
  • FIG. 5 is a flowchart showing the procedure of operations performed by the air conditioner 1 according to Embodiment 1.
  • FIG. FIG. 5 shows the procedure of operation from overvoltage detection to recovery in the first embodiment.
  • the bus voltage detection circuit 7 detects the bus voltage (S1), and the bus overvoltage detection circuit 14 determines whether the bus voltage detected by the bus voltage detection circuit 7 is equal to or higher than the threshold of the bus overvoltage detection circuit 14. (S2).
  • S2 the threshold of the bus overvoltage detection circuit 14.
  • the relay control unit 17 determines whether the bus voltage detected by the bus voltage detection circuit 7 is equal to or higher than the overvoltage protection threshold of the relay control unit 17 (S3). When the relay control unit 17 determines that the bus voltage is lower than the overvoltage protection threshold (No in S3), the operation of step S3 is performed, and then the operation of step S1 is performed.
  • the power supply voltage detection circuit 32 detects the power supply voltage (S4), and the power supply overvoltage detection circuit 12 determines whether the power supply voltage detected by the power supply voltage detection circuit 32 is equal to or higher than the threshold of the power supply overvoltage detection circuit 12. (S5).
  • the power supply overvoltage detection circuit 12 determines that the power supply voltage is lower than the threshold (No in S5), the operation of step S5 is performed, and then the operation of step S4 is performed.
  • the comparator 28a When the bus overvoltage detection circuit 14 determines that the bus voltage detected by the bus voltage detection circuit 7 is equal to or higher than the threshold of the bus overvoltage detection circuit 14 (Yes in S2), the comparator 28a outputs a signal indicating Low ( S6).
  • the relay control unit 17 determines that the bus voltage detected by the bus voltage detection circuit 7 is equal to or higher than the overvoltage protection threshold of the relay control unit 17 (Yes in S3), it outputs a signal indicating Low (S7).
  • the power supply overvoltage detection circuit 12 determines that the power supply voltage detected by the power supply voltage detection circuit 32 is equal to or higher than the threshold of the power supply overvoltage detection circuit 12 (Yes in S5), the comparator 30a outputs a signal indicating Low ( S8). After the operation of step S6, step S7 or step S8 is performed, the operation of step S9 is performed.
  • step S9 the relay 4 is turned off. That is, when any one of the bus overvoltage detection circuit 14, the relay control unit 17, and the power supply overvoltage detection circuit 12 detects overvoltage (Yes in S2, S3, and S5), the relay 4 is turned off (S9).
  • the relay control unit 17 confirms the control state of the relay 4 via the resistor R11, and the overvoltage protection circuit of any one of the bus overvoltage detection circuit 14, the relay control unit 17, and the power overvoltage detection circuit 12 outputs Low. When this is detected (S6, S7, S8), a Low signal is output to keep the relay 4 off (S9). Power supply to the outdoor unit 3 is cut off, and the outdoor unit 3 stops (S10).
  • the bus voltage detection circuit 24 detects whether the bus voltage is normal after a predetermined time has elapsed since the outdoor unit 3 stopped. (S11). When the bus voltage detection circuit 24 determines that the bus voltage is not a normal value (No in S11), the operation of step S11 is performed. If the bus voltage detection circuit 24 determines that the bus voltage is normal (Yes in S11), the relay 26 is turned on (S12). As a result, power supply to the converter circuit 5 of the outdoor unit 3 is started. That is, the bus voltage is applied to the outdoor unit 3 (S13).
  • the relay 26 is turned off again (S14).
  • the relay 10 is turned on (S15), and the state becomes ready for serial communication.
  • the relay control unit 17 outputs an ON signal to the relay control circuit 13, thereby turning the relay 4 ON (S16), and the state of the air conditioner 1 shifts to a state of normal operation.
  • the delay time used by the second delay circuit 31 of the power supply overvoltage detection circuit 12 is shorter than the delay time used by the first delay circuit 29 of the bus overvoltage detection circuit 14, and the power supply overvoltage detection circuit 12 Since the cutoff threshold used by the overvoltage detector 30 of the bus line overvoltage detector 14 is set higher than the cutoff threshold used by the overvoltage detector 28 of the bus overvoltage detector 14, the converter circuit 5 can be protected from the overvoltage surge superimposed on the power supply voltage. can. In addition, it is possible to protect the electronic circuit from a long-term rise in the power supply voltage and the rise in the bus voltage that approach the breakdown voltage rating of the circuit components.
  • the electronic circuit of the outdoor unit 3 does not need to use parts rated for a voltage higher than necessary, so that the cost of the parts can be reduced. That is, the overvoltage detection circuit according to the first embodiment protects the power supply circuit from a surge voltage, which is a steep overvoltage superimposed on the power supply voltage, and a long-term rise in the power supply voltage in an area where the power supply voltage is unstable. be able to.
  • the overvoltage detection circuit according to the first embodiment includes one power supply overvoltage detection circuit 12 and one bus overvoltage detection circuit 14.
  • the overvoltage detection circuit according to the first embodiment includes the power supply overvoltage detection circuit 12
  • the bus overvoltage detection circuit 14 is used to protect the electronic circuit from the surge voltage on the power supply system side.
  • FIG. 6 is a diagram showing the configuration of an overvoltage detection circuit according to the second embodiment. As shown in FIG. 6 , the overvoltage detection circuit according to the second embodiment has a bus voltage detection circuit 7 , a power supply overvoltage detection circuit 12 , n bus overvoltage detection circuits 14 and a relay 4 . n is an integer of 2 or more.
  • the delay time used by the second delay circuit 31 of the power supply overvoltage detection circuit 12 is t[ac]
  • the cutoff threshold used by the overvoltage detector 30 of the power supply overvoltage detection circuit 12 is Vth[ac]. ].
  • the delay time used by the first delay circuit 29 of the n-th bus overvoltage detection circuit 14 among the n bus overvoltage detection circuits 14 is t[n]
  • the overvoltage detection of the n-th bus overvoltage detection circuit 14 is
  • the cut-off threshold used by unit 28 is Vth[n].
  • the delay times used by the first delay circuits 29 of each of the n bus overvoltage detection circuits 14 are different from the delay times used by the first delay circuits 29 of the other bus overvoltage detection circuits 14 .
  • the cut-off threshold used by the overvoltage detector 28 of each of the n bus overvoltage detection circuits 14 is different from the cut-off threshold used by the overvoltage detectors 28 of the other bus overvoltage detection circuits 14 .
  • the delay time and cut-off threshold satisfy the following relationship. Delay time: t[ac] ⁇ t[n] ⁇ t[n ⁇ 1], . . . , t[2] ⁇ t[1] Cutoff threshold: Vth[ac]>Vth[n]>Vth[n ⁇ 1], . . . Vth[2]>Vth[1]
  • the overvoltage detection circuit according to the second embodiment has a plurality of bus overvoltage detection circuits 14 that use different delay times and cutoff thresholds, so that the circuit can be protected from the occurrence of a plurality of overvoltages.
  • FIG. 7 is a diagram showing the processor 91 when part or all of the controller 15 of the outdoor unit 3 of the air conditioner 1 according to Embodiment 1 is realized by the processor 91. As shown in FIG. That is, some or all of the functions of the control unit 15 may be realized by the processor 91 executing programs stored in the memory 92 .
  • the processor 91 is a CPU (Central Processing Unit), processing system, arithmetic system, microprocessor, or DSP (Digital Signal Processor).
  • Memory 92 is also shown in FIG.
  • control unit 15 When part or all of the functions of the control unit 15 are implemented by the processor 91, the part or all of the functions are implemented by the processor 91 and software, firmware, or a combination of software and firmware. Software or firmware is written as a program and stored in memory 92 . The processor 91 implements some or all of the functions of the control unit 15 by reading and executing programs stored in the memory 92 .
  • the outdoor unit 3 stores a program that results in part or all of the steps executed by the control unit 15 being executed. It has a memory 92 for It can be said that the program stored in the memory 92 causes the computer to execute at least part of the procedure or method executed by the control unit 15 .
  • the memory 92 is non-volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory). Or a volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disk), or the like.
  • FIG. 8 is a diagram showing the processing circuit 93 when part or all of the control section 15 of the outdoor unit 3 of the air conditioner 1 according to Embodiment 1 is realized by the processing circuit 93. As shown in FIG. That is, part or all of the control unit 15 may be implemented by the processing circuit 93 .
  • the processing circuit 93 is dedicated hardware.
  • the processing circuit 93 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. is.
  • control unit 15 may be realized by dedicated hardware separate from the rest of the control unit 15.
  • part of the multiple functions may be implemented by software or firmware, and the rest of the multiple functions may be implemented by dedicated hardware.
  • multiple functions of the control unit 15 can be realized by hardware, software, firmware, or a combination thereof.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Protection Of Static Devices (AREA)

Abstract

Ce circuit de détection de surtension comprend : un circuit de détection de tension de barre omnibus (7) ; un premier circuit de temporisation (29) qui retarde la tension de barre omnibus d'un premier délai ; un comparateur (28a) qui compare la tension de barre omnibus retardée à une première valeur seuil de coupure et délivre le premier résultat de comparaison obtenu ; un circuit de détection de tension d'alimentation électrique (32) ; un second circuit de temporisation (31) qui retarde la tension d'alimentation électrique d'un second délai ; un autre comparateur (30a) qui compare la tension d'alimentation électrique retardée à une seconde valeur seuil de coupure et délivre le second résultat de comparaison obtenu ; et un relais (4) qui commute, sur la base du premier résultat de comparaison et du second résultat de comparaison, entre l'activation et la désactivation de la réception d'énergie d'une unité extérieure (3) depuis une alimentation électrique CA (50). Le premier délai est plus long que le second délai. La première valeur seuil de coupure est inférieure à la seconde valeur seuil de coupure.
PCT/JP2022/007669 2022-02-24 2022-02-24 Circuit de détection de surtension WO2023162097A1 (fr)

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PCT/JP2022/007669 WO2023162097A1 (fr) 2022-02-24 2022-02-24 Circuit de détection de surtension
JP2024502341A JPWO2023162097A1 (fr) 2022-02-24 2022-02-24

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04161743A (ja) * 1990-10-25 1992-06-05 Mitsubishi Electric Corp 空気調和機の保護装置
JP2002281745A (ja) * 2001-03-21 2002-09-27 Sony Corp 電源装置
JP2003052120A (ja) * 2001-08-07 2003-02-21 Hitachi Ltd 過電圧検出回路、およびこれを用いた電源回路、電源システム、電子装置
JP2012110184A (ja) * 2010-11-19 2012-06-07 Panasonic Corp 空気調和機
JP2014027796A (ja) * 2012-07-27 2014-02-06 Daikin Ind Ltd 電子回路装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04161743A (ja) * 1990-10-25 1992-06-05 Mitsubishi Electric Corp 空気調和機の保護装置
JP2002281745A (ja) * 2001-03-21 2002-09-27 Sony Corp 電源装置
JP2003052120A (ja) * 2001-08-07 2003-02-21 Hitachi Ltd 過電圧検出回路、およびこれを用いた電源回路、電源システム、電子装置
JP2012110184A (ja) * 2010-11-19 2012-06-07 Panasonic Corp 空気調和機
JP2014027796A (ja) * 2012-07-27 2014-02-06 Daikin Ind Ltd 電子回路装置

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