WO2014184878A1 - 保護装置および保護方法 - Google Patents
保護装置および保護方法 Download PDFInfo
- Publication number
- WO2014184878A1 WO2014184878A1 PCT/JP2013/063450 JP2013063450W WO2014184878A1 WO 2014184878 A1 WO2014184878 A1 WO 2014184878A1 JP 2013063450 W JP2013063450 W JP 2013063450W WO 2014184878 A1 WO2014184878 A1 WO 2014184878A1
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- Prior art keywords
- transistor
- current
- voltage
- current path
- air conditioner
- Prior art date
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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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
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/32—Details or features not otherwise provided for preventing human errors during the installation, use or maintenance, e.g. goofy proof
Definitions
- the present invention relates to a protection device and a protection method.
- connection lines for example, an air conditioning system
- a power line for example, a communication line
- a common line common line for power transmission and communication
- the outdoor unit and the indoor unit are connected.
- the outdoor unit and the indoor unit are supplied with power from an AC power source connected between the power line and the common line.
- the outdoor unit includes a communication circuit in which a DC power source that supplies a DC voltage of about several tens of volts, a switching element, and a receiving element are connected in series, and the indoor unit has a switching element and a receiving element connected in series.
- a communication circuit is provided.
- the communication circuit provided in the outdoor unit and the communication circuit provided in the indoor unit are connected in parallel between the communication line and the shared line, thereby forming a closed circuit.
- an outdoor unit and an indoor unit control the loop current which flows through a closed circuit by switching ON / OFF of a switching element, and enable two-way communication.
- connection between the outdoor unit and the indoor unit is usually performed at the site where the outdoor unit and the indoor unit are installed. Therefore, an erroneous connection of the indoor unit or the connection line to the indoor unit may occur. If the AC power supply is mistakenly connected to both terminals (input terminal and output terminal) of the communication circuit that operates at a lower voltage than the AC voltage supplied from the AC power supply, the communication voltage of the outdoor unit and indoor unit communication circuit is insufficient. The communication circuit can be destroyed by overcurrent flowing through the outdoor unit and the indoor unit. For this reason, the outdoor unit and the indoor unit need protection means for protecting the communication circuit from overvoltage or overcurrent.
- Patent Document 1 An indoor conditioner that employs a positive temperature characteristic thermistor as a protective means is described in Patent Document 1.
- the overcurrent flows through the communication line of this room conditioner, the overcurrent flows through the thermistor. Accordingly, the thermistor generates heat, the resistance component of the thermistor increases, and the overcurrent is limited.
- Patent Document 2 discloses a communication control device in which a current limiting circuit including a current limiting bipolar transistor, a base-emitter voltage adjusting bipolar transistor, and a current detection resistor are connected in series to a communication circuit. Has been.
- a series circuit composed of an emitter-collector path of a current limiting bipolar transistor maintained in a saturated state and a current detection resistor is connected to the communication circuit. As the current flowing through the communication circuit increases, the voltage (both-end voltage) of the current detection resistor increases.
- the bipolar transistor for adjusting the base-emitter voltage adjusts the base-emitter voltage of the current limiting bipolar transistor, and the voltage of the current detection resistor ( It works to keep the voltage at both ends constant. With this operation, the upper limit of the current flowing through the communication circuit is limited, so that the current limit circuit can protect the communication circuit from eddy currents.
- the indoor conditioner described in Patent Document 1 limits overcurrent with a positive temperature characteristic thermistor. For this reason, an overcurrent may flow to the communication circuit due to the operation delay of the positive temperature characteristic thermistor.
- the current limiting circuit described in Patent Document 2 realizes current limiting by operating a current limiting transistor in an active region. Therefore, in order to protect the communication circuit from the erroneous connection of the AC power supply to the communication circuit, the current limiting transistor needs to be a transistor having a high breakdown voltage and a high allowable collector loss. However, such a transistor generally has a problem that its operation speed is low, it is expensive, and the component size is increased. There is also a problem that a circuit design that realizes sufficient heat dissipation of the current limiting transistor is necessary.
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a protection device and a protection method capable of reducing the operation delay and reducing the cost.
- a protection device for preventing an overcurrent from flowing in a communication line includes a communication line for passing a current, a power line for transmitting power, and a current flowing and transmitting power
- the main air conditioner and the sub air conditioner are connected to each other via a connection line consisting of a common line, and the main air conditioner and the sub air conditioner are bidirectional with a signal generated by switching on / off the current flowing through the communication line. It is provided in a communication device for air conditioning that realizes communication.
- the first transistor has a current path connected in series to the communication line.
- the current limit control unit flows in the current path by controlling the first transistor so that the resistance value of the current path increases when the current flowing in the current path of the first transistor becomes equal to or greater than the set current. Limit current.
- the current cutoff control unit turns off the first transistor when the voltage across the current path of the first transistor becomes equal to or higher than the set voltage.
- the operation delay is small and the cost can be reduced.
- FIG. 3 is a circuit diagram of the communication power supply unit shown in FIG. 2. It is a circuit diagram of the main protection part shown in FIG. FIG. 3 is a circuit diagram of a main transmission unit shown in FIG. 2.
- FIG. 3 is a circuit diagram of a main receiving unit shown in FIG. 2.
- FIG. 8 is a circuit diagram of the slave receiving unit shown in FIG. 7.
- FIG. 8 is a circuit diagram of the slave transmission unit shown in FIG. 7.
- FIG. 8 is a circuit diagram of the secondary protection unit shown in FIG. 7. It is a circuit diagram at the time of comprising the main protection part shown in FIG. 2 with a field effect transistor.
- the air conditioning system 10 includes one main air conditioner 11 and three sub air conditioners 12 as shown in FIG.
- the air conditioning system 10 controls the temperature of the room to be controlled, for example.
- the main air conditioner 11 is an outdoor unit, for example.
- the sub air conditioner 12 is an indoor unit, for example.
- the main air conditioner 11 transmits a power line L1 for transmitting power, a communication line L2 for transmitting a signal (flowing current), and a shared line (for transmitting power and flowing current) for transmitting both power and signal. It is connected to the secondary air conditioner 12 by a connection line composed of a ground line L3.
- the main air conditioner 11 and the sub air conditioner 12 operate with an AC voltage from the commercial power supply PS applied between the power supply line L1 and the common line L3. Specifically, the main air conditioner 11 and the sub air conditioner 12 are supplied with power from the commercial power source PS and operate air conditioning units such as a heat exchanger and an inverter circuit.
- the main air conditioner 11 and the sub air conditioner 12 perform bidirectional communication via the communication line L2 and the common line L3.
- the main air conditioner 11 and the sub air conditioner 12 are serial signals generated by switching on (flowing) / off (not flowing) the signal current Is flowing through the communication line L2 and the common line L3. Bidirectional communication is performed by a signal including air conditioning control information. As will be described later, the signal current Is flowing through the communication line L2 flows only in the direction from the main air conditioner 11 toward the sub air conditioner 12.
- the main air conditioner 11 collects information such as room temperature, humidity, and set (target) temperature, for example, and serially transmits a control command to each sub air conditioner 12 to control them.
- the main air conditioner 11 includes a main control power supply unit 21, a communication power supply unit 22, a main protection unit 23, a main transmission unit 24, a main reception unit 25, a resistor R1, A rectifier diode 26, a terminator unit 27, and a main control unit 28 are provided.
- the main air conditioner 11 is provided with the structure for normal air conditioning control, such as a heat exchanger, for example, it has shown centering on the part relevant to the communication function relevant to this invention, and a protection function here.
- the main control power supply unit 21 generates a DC voltage for operating the main control unit 28 from the AC voltage from the commercial power supply PS applied between the power supply line L1 and the shared line L3, and the main control unit 28.
- one input terminal of the main control power supply unit 21 is connected to the power supply line L1, and the other input terminal is connected to the common line L3.
- the main control power supply unit 21 receives an AC voltage applied from the commercial power supply PS connected between the power supply line L1 and the commonality L3 via both input terminals, and receives a transformer, a rectifier circuit, a smoothing circuit, and the like. Thus, a DC voltage is generated and output between the ground terminal and the output terminal connected to the main control unit 28.
- a transformer it is desirable to use an insulating transformer that can insulate the power supply side from the load side.
- the communication power supply unit 22 generates a communication voltage (for example, a DC voltage of 24 volts) for forming the signal current Is for serial communication from the AC voltage supplied from the commercial power supply PS.
- a communication voltage for example, a DC voltage of 24 volts
- the communication power supply unit 22 includes, for example, a half-wave rectifier circuit including a resistor R2, a rectifier diode 221, a Zener diode 222, and a capacitor 223, as shown in FIG.
- One end of the resistor R2 is connected to the power supply line L1 via one input terminal of the communication power supply unit 22, and the other end of the resistor R2 is connected to the anode of the rectifier diode 221.
- the cathode of the rectifier diode 221 is connected to the cathode of the Zener diode 222, one end of the capacitor 223, and the terminal TP1.
- the anode of the Zener diode 222 and the other end of the capacitor 223 are connected to the common line L3 via the other input terminal of the communication power supply unit 22.
- the resistor R2 and the rectifier diode 221 rectify the AC voltage supplied from the commercial power supply PS via the power line L1 and the common line L3 by half-wave.
- the zener diode 222 clips the rectified half-wave voltage value to the communication voltage.
- the capacitor 223 smoothes the half wave clipped to the communication voltage.
- the holding voltage (communication voltage) of the capacitor 223 is output between the main protection unit 23 and the shared line L3 via the terminal TP1.
- the main protection unit 23 shown in FIG. 2 when the commercial power supply PS is mistakenly connected between the communication line L2 and the shared line L3, an overcurrent flows through the communication line L2, and the main transmission unit 24 and the main It is prevented from flowing through the communication circuit composed of the receiving unit 25.
- the main protection unit 23 protects the communication circuit (the main transmission unit 24 and the main reception unit 25) from an overvoltage when the commercial power source PS is erroneously connected between the communication line L2 and the shared line L3.
- the main protection unit 23 includes a current limit control unit 231, a load limit unit 232, an erroneous connection detection unit 233, and a resistor R6.
- the current limit control unit 231 limits the maximum value of the signal current Is flowing through the communication line L2 and the shared line L3 (signal current Is flowing through the communication circuit), and includes a resistor R3, a PNP transistor TR2, And a rectifier diode D1.
- the PNP transistor TR1 connected to the rectifier diode D1 has an emitter-collector path (current path) connected in series to the communication line L2.
- One end of the resistor R3 and the emitter of the transistor TR1 are connected to the terminal TP1 (output terminal) of the communication power supply unit 22 via the terminal TP2.
- the other end of the resistor R3 and the base of the transistor TR1 are connected to the anode of the rectifier diode D1 and the load limiting unit 232.
- the cathode of the rectifier diode D1 is connected to the emitter of the transistor TR2.
- the collector of the transistor TR2 is connected to the main transmission unit 24 via the terminal TP3.
- the base of the transistor TR2 is connected to the collector of the transistor TR1, the erroneous connection detector 233, and one end of the resistor R6.
- the other end of the resistor R6 is connected to the shared line L3.
- the transistor TR2 changes the base-emitter voltage of the transistor TR1 by changing the collector-emitter voltage of the transistor TR2 so that the voltage across the resistor R3 is balanced with the on-voltage of the base-emitter voltage of the transistor TR2. Adjust the emitter-to-emitter voltage. For this reason, the upper limit of the signal current Is flowing through the main transmitter 24 can be limited.
- the collector-emitter voltage of the transistor TR1 is compared with the case where the transistor TR1 operates in the saturation region. Becomes higher. A collector loss corresponding to the integrated value of the collector-emitter voltage of the transistor TR1 and the collector current (signal current Is) of the transistor TR1 occurs in the transistor TR1.
- a high voltage such as an AC voltage supplied from the commercial power source PS is applied between the communication line L2 and the shared line L3, the collector loss generated in the transistor TR1 becomes very large. For this reason, the transistor TR1 is required to be expensive, have a large component size, and have a high breakdown voltage and a high allowable collector loss.
- a load limiting unit 232 is provided in the main protection unit 23.
- the load limiting unit 232 suppresses the collector loss of the transistor TR1 by turning off the transistor TR1 when the voltage between the emitter and the collector of the transistor TR1 exceeds a set value.
- the load limiting unit 232 turns off the transistor TR1 when the voltage between the emitter and the collector of the transistor TR1 becomes a set value or more.
- the present invention is not limited to this.
- the terminal TP2 and the terminal TP3 The transistor TR1 may be turned off when the voltage between is higher than the reference value and the voltage between the emitter and collector of the transistor TR1 is higher than the set value.
- the load limiting unit 232 may turn off the transistor TR1 when the voltage between the terminal TP4 and the terminal TP7 is equal to or higher than a reference value and the voltage between the emitter and the collector of the transistor TR1 is higher than a set value. Good.
- the load limiting unit 232 includes a PNP transistor TR3 and resistors R4 and R5.
- the transistor TR3 suppresses the collector loss of the transistor TR1 by detecting overvoltage at both ends of the series resistance of the resistor R4 and the resistor R5.
- One end of the resistor R4 is connected to the emitter of the transistor TR3, the other end of the resistor R3, the base of the transistor TR2, and the anode of the rectifier diode D1.
- the other end of the resistor R4 is connected to the base of the transistor TR3 and one end of the resistor R5.
- the other end of the resistor R5 is connected to the collector of the transistor TR1.
- the collector of the transistor TR3 is connected to the erroneous connection detection unit 233.
- the voltage obtained by adding the forward voltage of the rectifier diode D1 and the collector-emitter voltage of the transistor TR1 is applied to the series resistance of the resistor R4 and the resistor R5.
- the base-emitter voltage of the transistor TR1 drops, the transistor TR1 is cut off, and the collector current (signal current Is) of the transistor TR1 is cut off.
- the allowable collector loss of the transistor TR1 can be suppressed as compared with the case where the load limiting unit 232 is not provided. Therefore, an inexpensive low allowable collector loss transistor can be used for the transistor TR1.
- the erroneous connection detection unit 233 detects the collector current of the transistor TR3 that flows when the voltage across the series resistance of the resistor R4 and the resistor R5 is equal to or higher than a predetermined value, and detects the detection signal (the commercial power supply PS is erroneously connected). Signal) to the main control unit 28. Accordingly, the main control unit 28 can detect that an overvoltage is applied to the communication circuit (the main transmission unit 24 and the main reception unit 25) due to an erroneous connection.
- the erroneous connection detection unit 233 includes a photocoupler including a photodiode 233a and a phototransistor 233b.
- the anode of the photodiode 233a is connected to the collector of the transistor TR3, and the cathode is connected to the collector of the transistor TR2, the base of the transistor TR1, and one end of the resistor R6.
- one end of the current path of the phototransistor 233b is connected to the terminal TA of the main control unit 28, and the other end of the current path is grounded.
- the emitter-collector of the transistor TR3 becomes conductive. At this time, the current flowing through the emitter-collector path of the transistor TR3 flows through the photodiode 233a, and turns on the photodiode 233a.
- the phototransistor 233b is turned on, and the emitter-collector path is made conductive. For this reason, the terminal TA of the main control unit 28 is grounded. Thereby, the main control unit 28 detects that the commercial power source PS is erroneously connected.
- the main transmission unit 24 includes a Zener diode 241 and a photocoupler 242.
- the cathode of the Zener diode 241 is connected to one end of the current path of the main transistor 23 and the phototransistor 242b of the photocoupler 242.
- the anode of the Zener diode 241 is connected to the other end of the current path of the phototransistor 242b and the main receiver 25.
- the anode of the photodiode 242a is connected to the terminal TB of the main controller 28, and the cathode of the photodiode 242a is grounded.
- the main control unit 28 sets the voltage signal at the terminal TB to a high level, a current flows through the photodiode 242a. As a result, the photodiode 242a emits light.
- the phototransistor 242b is turned on by the light from the photodiode 242a. For this reason, the signal current Is flows from the communication power supply unit 22 ⁇ the main protection unit 23 ⁇ the terminal TP4 ⁇ the phototransistor 242b ⁇ the terminal TP5 ⁇ the main reception unit 25 ⁇ the communication line L2.
- the main control unit 28 sets the voltage signal at the terminal TB to a low level, no current flows through the photodiode 242a. Then, the phototransistor 242b is turned off, The signal current Is is cut off.
- the main control unit 28 can generate the signal current Is by controlling the voltage signal at the terminal TB.
- the phototransistor 242b when a large voltage is applied to the communication circuit (the main transmission unit 24 and the main reception unit 25), such as when the commercial power supply PS is mistakenly connected between the communication line L2 and the shared line L3, the phototransistor 242b. Is cut off, an overvoltage is applied to the phototransistor 242b, causing the phototransistor 242b to fail. In order to prevent this, withstand voltage protection of the phototransistor 242b is realized by connecting a zener diode 241 in parallel to the phototransistor 242b. In addition, a phototransistor having a high collector breakdown voltage may be used for the phototransistor 242b without using the Zener diode 241.
- the main reception unit 25 shown in FIG. 2 generates a reception signal by detecting the presence / absence of the signal current Is and transmits the reception signal to the main control unit 28.
- the main receiving unit 25 is composed of, for example, a photocoupler 251.
- the anode of the photodiode 251a constituting the photocoupler 251 is connected to the main transmitter 24 via the terminal TP6, and the cathode thereof is connected to one end of the resistor R1 via the terminal TP7.
- One end of the current path of the phototransistor 251b is connected to the terminal TC of the main control unit 28, and the other end of the current path is grounded.
- the terminal TC of the main control unit 28 is pulled up.
- the photodiode 251a When the signal current Is flows through the photodiode 251a, the photodiode 251a emits light and turns on the phototransistor 251b. As a result, the current path of the phototransistor 251b becomes conductive, and a low-level received signal is generated.
- the resistor R1 shown in FIG. 2 is a limiting resistor that determines the maximum value of the signal current Is together with the resistor R7 of the sub air conditioner 12.
- One end of the resistor R1 is connected to the terminal TP7 of the main receiver 25.
- the other end of the resistor R1 is connected to the anode of the rectifier diode 26.
- the rectifier diode 26 blocks a reverse current flowing from the communication line L2 toward the resistor R1.
- the terminator unit 27 is composed of a capacitor or the like, reduces the impedance between the communication line L2 and the shared line L3, and causes noise components on the communication line L2 to flow through the shared line L3. Thereby, it is possible to suppress the superimposition of induction noise or the like on the signal current Is, and to stabilize the signal current Is.
- the main control unit 28 is configured by a processor or the like that is operated by the operation power supplied from the main control power supply unit 21 and controls the normal air conditioning operation of the main air conditioner 11. In addition, the main control unit 28 transmits and receives a serial signal using the signal current Is to and from the sub air conditioner 12.
- the main control unit 28 executes control processing based on the detection signal of the erroneous connection detection unit 233. For example, when the main control unit 28 receives a detection signal, the main control unit 28 turns on a lamp provided in the main air conditioner 11. Thereby, the installer who installs the main air conditioner 11 can grasp that the commercial power source PS is erroneously connected.
- each slave air conditioner 12 includes a slave control power source 31, rectifier diodes 32 and 36, a resistor R7, a slave receiver 33, a slave transmitter 34, and a slave protector. 35 and a slave control unit 37.
- Each sub air conditioner 12 has a configuration for normal air conditioning control, but here, the portion related to the communication function and the protection function related to the present invention is mainly shown.
- the slave control power supply unit 31 generates a DC voltage for operating the slave control unit 37 from the AC voltage from the commercial power supply PS applied between the power supply line L1 and the shared line L3. 37.
- one input terminal of the sub-control power supply unit 31 is connected to the power supply line L1, and the other input terminal is connected to the common line L3.
- the sub-control power supply unit 31 receives an AC voltage applied from the commercial power supply PS connected between the power supply line L1 and the commonality L3 via both input terminals, and receives a transformer, a rectifier circuit, a smoothing circuit, and the like. Thus, a DC voltage is generated and output between the ground terminal and the output terminal connected to the sub control unit 37.
- a transformer it is desirable to use an insulating transformer that can insulate the power supply side from the load side.
- the rectifier diodes 32 and 36 protect the slave receiver 33 and the slave transmitter 34 from a reverse voltage.
- the anode of the rectifier diode 32 is connected to the communication line L2, and the cathode of the rectifier diode 32 is connected to one end of the resistor R7, the cathode of the rectifier diode 36, and the terminal SP6 of the secondary protector 35.
- the anode of the rectifier diode 36 is connected to the shared line L3 and the terminal SP7 of the secondary protection unit 35.
- Resistor R7 determines the magnitude of the signal current Is.
- One end of the resistor R7 is connected to the cathodes of the rectifier diodes 32 and 36 and the terminal SP6 of the secondary protection unit 35.
- the other end of the resistor R7 is connected to the slave receiver 33.
- the slave receiver 33 detects the presence / absence of the signal current Is to generate a reception signal and transmits it to the slave controller 37.
- the slave receiver 33 receives a low-level received signal if the signal current Is flows through the photocoupler 331, and the signal current Is to the photocoupler 331. If it is not flowing, a high level received signal is output to the slave control unit 37.
- the slave receiving unit 33 includes a photocoupler 331, for example.
- the anode of the photodiode 331a constituting the photocoupler 331 is connected to the other end of the resistor R7 via the terminal SP1, and the cathode thereof is connected to the slave transmitter 34 via the terminal SP2.
- One end of the current path of the phototransistor 331b is connected to the terminal SA of the slave control unit 37, and the other end of the current path is grounded.
- the slave transmission unit 34 includes a Zener diode 341 and a photocoupler 342.
- the cathode of the Zener diode 341 is connected to the terminal SP3 and one end of the current path of the phototransistor 342b of the photocoupler 342.
- the anode of the Zener diode 341 is connected to the other end of the current path of the phototransistor 342b and the main receiver 25.
- the anode of the photodiode 342a is connected to the terminal SB of the slave control unit 37, and the cathode of the photodiode 342a is grounded.
- the slave control unit 37 sets the voltage signal at the terminal SB to the high level, a current flows through the photodiode 342a. As a result, the photodiode 342a emits light.
- the phototransistor 342b is turned on by the light from the photodiode 342a. For this reason, the signal current Is flows through the communication line L2, the slave receiver 33, the terminal SP2, the terminal SP3, the phototransistor 342b, the terminal SP4, the slave protector 35, and the shared line L3.
- the sub control unit 37 sets the voltage signal at the terminal SB to the low level, no current flows through the photodiode 342a. Then, the phototransistor 342b is turned off, The signal current Is is cut off.
- the sub control unit 37 can generate the signal current Is by controlling the voltage signal of the terminal SB.
- the phototransistor 342b when a large voltage is applied to the communication circuit (the slave receiver 33 and the slave transmitter 34), such as when the commercial power supply PS is mistakenly connected between the communication line L2 and the shared line L3, the phototransistor 342b. Is cut off, an overvoltage is applied to the phototransistor 342b and the phototransistor 342b fails. In order to prevent this, withstand voltage protection of the phototransistor 342b is realized by connecting a zener diode 341 in parallel to the phototransistor 342b. In addition to this, a phototransistor having a high collector breakdown voltage may be used for the phototransistor 342b without using the Zener diode 341.
- the slave protection unit 35 shown in FIG. 7 protects the slave reception unit 33 and the slave transmission unit 34 from overvoltage and overcurrent when the commercial power supply PS is erroneously connected between the communication line L2 and the shared line L3. .
- the secondary protection unit 35 includes a current limit control unit 351, a load limit unit 352, an erroneous connection detection unit 353, and a resistor R8.
- the current limit control unit 351 limits the maximum value of the signal current Is flowing through the slave receiver 33 and the slave transmitter 34, and includes an NPN transistor TR5, a rectifier diode D2, and a resistor R9. ing.
- the NPN transistor TR4 connected to the rectifier diode D2 has an emitter-collector path (current path) connected in series to the communication line L2.
- One end of the resistor R9 and the emitter of the transistor TR5 are connected to the anode of the rectifier diode 36 and the common line L3 via the terminal SP7.
- the other end of the resistor R9 and the base of the transistor TR5 are connected to the cathode of the rectifier diode D2 and the load limiting unit 352.
- the anode of the rectifier diode D2 is connected to the emitter of the transistor TR4.
- the collector of the transistor TR4 is connected to the slave transmitter 34 via the terminal SP5.
- the collector of the transistor TR4 is connected to the load limiter 352.
- the base of the transistor TR4 is connected to the collector of the transistor TR5, the erroneous connection detector 353, and one end of the resistor R8.
- the other end of the resistor R8 is connected to the cathode of the rectifier diode 32, one end of the resistor R7, and the cathode of the rectifier diode 36 via the terminal SP6.
- the transistor TR5 When the commercial power source PS is erroneously connected between the communication line L2 and the shared line L3, and the signal current Is increases to a predetermined value or more, the transistor TR5 has a voltage across the resistor R9 that has a voltage across the transistor TR5. The collector-emitter voltage is changed so as to maintain an equilibrium state with the on-voltage (about 0.6 volts). Thereby, the transistor TR5 adjusts the base-emitter voltage of the transistor TR4. In this way, the upper limit of the current Is flowing through the communication circuit (the slave receiver 33 and the slave transmitter 34) can be limited, and the communication circuit can be protected from eddy currents.
- the collector-emitter voltage of the transistor TR4 is not operating in the saturation region. In comparison (as compared to the case where the upper limit of the signal current Is is not limited), it becomes larger.
- a collector loss corresponding to an integrated value of the collector-emitter voltage of the transistor TR4 and the collector current (signal current Is) of the transistor TR4 is generated in the transistor TR4.
- a high voltage such as a voltage supplied from the commercial power supply PS is applied between the communication line L2 and the shared line L3
- the collector loss generated in the transistor TR4 becomes very large. Therefore, the transistor TR4 is required to be expensive and have a large component size, high breakdown voltage, and high allowable collector loss.
- a load limiting unit 352 is provided in the secondary protection unit 35.
- the load limiting unit 352 suppresses the collector loss of the transistor TR4 by turning off the transistor TR4.
- the load limiting unit 352 turns off the transistor TR4 when the voltage between the emitter and the collector of the transistor TR4 exceeds a set value.
- the present invention is not limited to this, and for example, the terminal SP5 and the terminal SP7
- the transistor TR4 may be turned off when the voltage between is higher than the reference value and the voltage between the emitter and collector of the transistor TR4 is higher than the set value.
- the load limiting unit 352 may turn off the transistor TR4 when the voltage between the terminal SP1 and the terminal SP4 becomes equal to or higher than a reference value and the voltage between the emitter and collector of the transistor TR4 becomes equal to or higher than a set value. Good.
- the load limiting unit 352 includes an NPN transistor TR6 and resistors R10 and R11.
- the transistor TR6 suppresses the collector loss of the transistor TR4 by detecting overvoltage of the voltage across the series resistance of the resistor R10 and the resistor R11.
- One end of the resistor R10 is connected to the emitter of the transistor TR6, the other end of the resistor R9, the base of the transistor TR5, and the cathode of the rectifier diode D2.
- the other end of the resistor R10 is connected to the base of the transistor TR6 and one end of the resistor R11.
- the other end of the resistor R11 is connected to the collector of the transistor TR4. Further, the collector of the transistor TR6 is connected to the erroneous connection detector 353.
- a voltage obtained by adding the forward voltage of the rectifier diode D2 and the collector-emitter voltage of the transistor TR4 is applied to the series resistance of the resistor R10 and the resistor R11.
- the allowable collector loss of the transistor TR4 can be suppressed as compared with the case where the load limiting unit 352 is not provided. Therefore, an inexpensive low allowable collector loss transistor can be used for the transistor TR4.
- the erroneous connection detection unit 353 detects the collector current of the transistor TR6 that flows when the voltage across the series resistance of the resistor R10 and the resistor R11 is equal to or higher than a predetermined value, and indicates a detection signal (indicating that the commercial power supply PS is erroneously connected). Signal) to the slave control unit 37. Accordingly, the slave control unit 37 can detect that an overvoltage is applied to the communication circuit (the slave reception unit 33 and the slave transmission unit 34) due to erroneous connection.
- the erroneous connection detection unit 353 includes a photocoupler including a photodiode 353a and a phototransistor 353b.
- the cathode of the photodiode 353a is connected to the collector of the transistor TR6, and the anode thereof is connected to the base of the transistor TR4, the collector of the transistor TR5, and one end of the resistor R8.
- one end of the current path of the phototransistor 353b is connected to the terminal SC of the slave control unit 37, and the other end of the current path is grounded.
- the emitter-collector of the transistor TR6 becomes conductive. At this time, the current flowing through the emitter-collector path of the transistor TR6 flows through the photodiode 353a, and turns on the photodiode 353a.
- the phototransistor 353b is turned on, and the emitter-collector path is made conductive. For this reason, the terminal SC of the sub control unit 37 is grounded. Thereby, the sub control unit 37 detects that the commercial power source PS is erroneously connected.
- the slave control unit 37 is configured by a processor or the like that is operated by the operation power supplied from the slave control power supply unit 31 and controls the normal air conditioning operation of the slave air conditioner 12.
- the sub control unit 37 transmits and receives a serial signal using the signal current Is to and from the main air conditioner 11.
- the slave control unit 37 executes a control process based on the detection signal of the erroneous connection detection unit 353. For example, when the sub control unit 37 receives a detection signal, the sub control unit 37 turns on a lamp provided in the main air conditioner 12. Thereby, the installer who installs the main air conditioner 12 can grasp that the commercial power source PS is erroneously connected.
- the main control unit 28 When the main air conditioner 11 transmits a serial signal to the sub air conditioner 12, the main control unit 28 outputs a serial signal to be transmitted to the sub air conditioner 12 to the terminal TB.
- the main control unit 28 outputs a high level voltage to the terminal TB, the photodiode 242a emits light, the phototransistor 242b becomes conductive, and the signal current Is flows.
- the main control unit 28 applies a low level voltage to the terminal TB, the photodiode 242a does not emit light, the phototransistor 242b is turned off, and the signal current Is does not flow.
- the signal current Is corresponding to the serial signal output by the main control unit 28 is transmitted to the sub air conditioner 12 via the communication line L2.
- the sub control unit 37 shown in FIG. 7 causes the current signal Is to flow from the communication line L2 to the common line L3 (sub receiver unit 33). So that the current signal Is can be received), a high level voltage is continuously output to the terminal SB, and the phototransistor 342b is kept conductive.
- the slave receiver 33 outputs a low level received signal to the slave controller 37.
- the slave receiver 33 outputs a high level received signal to the slave controller 37.
- the main air conditioner 11 transmits a serial signal to the sub air conditioner 12 as described above.
- the sub air conditioner 12 receives the serial signal from the main air conditioner 11.
- the main control unit 28 When the transmission of the serial signal from the main air conditioner 11 to the sub air conditioner 12 is completed, the main control unit 28 outputs a serial signal indicating the completion of transmission to the terminal TB and causes the main transmission unit 24 to transmit the transmission completion signal. . Thereafter, the main control unit 28 connects the terminal TP1 of the communication power supply unit 22 that outputs the communication voltage and the communication line L2 (so that the main signal receiving unit 25 can receive the current signal Is) to the terminal TB. The high level voltage is continuously output, and the phototransistor 242b is kept conductive.
- the slave control unit 37 sets the high level voltage continuously output to the slave transmission unit 34 to the low level. Thereafter, the sub control unit 37 outputs a serial signal to be transmitted to the main air conditioner 11 to the terminal SB.
- the slave control unit 37 outputs a high level voltage to the terminal SB, the photodiode 342a emits light, the phototransistor 342b becomes conductive, and the signal current Is flows.
- the slave control unit 37 applies a low level voltage to the terminal TB, the photodiode 342a does not emit light, the phototransistor 342b is turned off, and the signal current Is does not flow.
- the signal current Is corresponding to the serial signal output from the sub control unit 37 flows to the main air conditioner 11.
- the main receiving unit 25 When the signal current Is flows through the main air conditioner 11, the signal current Is flows through the photodiode 251a of the main receiver 25. Therefore, the main receiving unit 25 outputs a low level received signal to the main control unit 28.
- the main receiver 25 outputs a high level received signal to the main controller 28.
- the sub air conditioner 12 transmits a serial signal to the main air conditioner 11.
- the main air conditioner 11 receives a serial signal from the sub air conditioner 12.
- the sub control unit 37 When the transmission of the serial signal from the sub air conditioner 12 to the main air conditioner 11 is completed, the sub control unit 37 outputs a serial signal indicating transmission completion to the terminal SB and causes the sub transmission unit 34 to transmit the transmission completion signal. . Thereafter, the slave control unit 37 continues to output a high level voltage to the terminal SB so that the current signal Is flows from the communication line L2 to the shared line L3 (so that the current signal Is can be received by the slave reception unit 33).
- the phototransistor 342b is kept conductive.
- the rectifier diode 26 of the main air conditioner 11 blocks the current flowing from the communication line L2 toward the resistor R1. Thereby, it is possible to prevent a reverse voltage from being applied to the main protection unit 23, the main transmission unit 24, and the main reception unit 25.
- the rectifier diode 32 When the potential of the communication line L2 is higher than the potential of the shared line L3, the communication line L2, the rectifier diode 32, the resistor R7, the photodiode 331a of the slave receiver 33, the Zener diode 341 of the slave transmitter 34, and the slave protector 35.
- a closed circuit composed of the emitter-collector path of the transistor TR4, the rectifier diode D2, the resistor R9 and the common line L3 is formed.
- the transistor TR5 When the signal current Is flowing through the closed circuit increases to a predetermined value or more, the transistor TR5 has a collector-voltage so that the voltage across the resistor R9 is balanced with the ON voltage (about 0.6 volts) of the transistor TR5. Vary the emitter-to-emitter voltage. Thereby, the transistor TR5 adjusts the base-emitter voltage of the transistor TR4. In this way, the current limit control unit 351 limits the upper limit of the current Is flowing through the communication circuit (the slave reception unit 33 and the slave transmission unit 34).
- the current limit control unit 351 limits the signal current Is
- the voltage across the series resistance of the resistor R10 and the resistor R11 increases.
- the voltage across the resistor R10 which is a divided voltage of the voltage across both ends, exceeds the on-voltage (about 0.6 volts) between the base and the emitter of the transistor TR6, the load limiting unit 352 of the secondary protection unit 35 The transistor TR6 is turned on to bring the emitter-collector into a conductive state.
- the operation of the sub air conditioner 12 described above does not require control of the sub control unit 37. Therefore, even if an abnormality occurs in the slave control unit 37 and the slave control unit 37 does not operate correctly, the slave protection unit 35 prevents the rectifier diode 32, the slave reception unit 33, and the slave transmission unit 34 from being overcurrent. Can protect.
- the secondary protection part 35 is arrange
- the current can be limited.
- the transistor TR2 When the signal current Is flowing through the closed circuit increases to a predetermined value or more, the transistor TR2 is connected to the collector ⁇ so that the voltage across the resistor R3 is balanced with the ON voltage (about 0.6 volts) of the transistor TR2. Vary the emitter-to-emitter voltage. Thereby, the transistor TR2 adjusts the base-emitter voltage of the transistor TR1. In this way, the current limit control unit 231 limits the upper limit of the current Is flowing through the communication circuit (the main transmission unit 24 and the main reception unit 25).
- the current limit control unit 231 limits the signal current Is
- the voltage across the series resistance of the resistor R4 and the resistor R5 increases.
- the voltage across the resistor R4 which is a divided voltage of the voltage across both ends, exceeds the on-voltage (about 0.6 volts) between the base and the emitter of the transistor TR3, the load limiting unit 232 of the secondary protection unit 23
- the transistor TR3 is turned on, and the emitter-collector is made conductive.
- the voltage between the base and the emitter of the transistor TR1 drops, the transistor TR1 is cut off, and the collector current (signal current Is) of the transistor TR1 is cut off.
- the communication circuit (the main transmission unit 24 and the main reception unit 25, the sub reception unit 33 and the sub transmission unit 34) flows.
- the communication circuit is protected from an overcurrent generated when the commercial power supply PS is erroneously connected. can do.
- the current limit control unit 231 since the current limit control unit 231 includes the transistor TR2, it can limit the overcurrent at a higher speed than the positive temperature coefficient thermistor and can perform a safer protection operation. Similarly, since the current limit control unit 351 includes the transistor TR5, it can limit the overcurrent at a higher speed than the positive characteristic thermistor and can perform a safer protection operation.
- the transistor TR1 (TR4) when the load limiter 232 (352) detects an overvoltage higher than a predetermined level, the transistor TR1 (TR4) is forcibly turned off to cut off the signal current Is. Therefore, an inexpensive low-permissible collector-loss transistor can be used as the transistor TR1 (TR4). In addition, it is easy to design a circuit that realizes heat dissipation of the transistor TR1 (TR4).
- the main protection unit 23 and the sub protection unit 35 protect circuit components from overvoltage and overcurrent. Therefore, no matter what serial signals the main control unit 28 and the sub control unit 37 output to the main transmission unit 24 and the sub transmission unit 34 due to the runaway of the software, the main protection unit 23 and the sub protection unit 35 are sure to Circuit protection.
- Zener diodes 241 and 341 are connected in parallel to the photocouplers 242 and 342 of the main transmitter 24 and the slave transmitter 34, and high collector breakdown voltage products are used for the transistors TR1 and TR4. As the 342, a normal collector withstand voltage can be used.
- Conventional main air conditioners and sub air conditioners that do not have the Zener diodes 241 and 341 or the transistors TR1 and TR4 use high-collector withstand-voltage photocouplers.
- photocouplers are expensive, and there are problems that the number of manufactured models is small and there is no model that can perform high-speed switching necessary for high-speed communication.
- the main air conditioner 11 and the sub air conditioner 12 of the present embodiment can use a photocoupler having a normal collector breakdown voltage, such a problem can be solved.
- the above-described main protection unit 23 is composed of a PNP transistor, but is not limited thereto.
- the main protection unit 23 that realizes the above-described logic may be configured by an NPN transistor.
- sub-protection unit 35 is composed of an NPN type transistor, it is not limited to this.
- the sub-protection unit 35 that realizes the above-described logic may be configured with a PNP transistor.
- the transistor TR1 of the main protection unit 23 is one element, but may be composed of two or more elements.
- the emitter of the first element is connected to the cathode of the rectifier diode D1
- the collector of the first element is connected to the emitter of the second element.
- the base of the first element and the base of the second element are connected to one end of the resistor R6.
- the collector of the second element may be connected to the terminal TP3 and the load limiting unit 232.
- the transistor TR4 of the secondary protection unit 35 may be composed of two or more elements.
- main protection unit 23 and sub-protection unit 35 are composed of bipolar transistors, but are not limited thereto. That is, you may comprise the main protection part 23 and the secondary protection part 35 by a field effect transistor.
- the PNP transistors TR2 to TR3 are replaced with N type field effect transistors FET1 to FET3 as shown in FIG.
- the gate of the field effect transistor FET 1 is connected to the other end of the resistor R 3, the anode of the rectifier diode D 1, and the load limiting unit 232.
- the source of the field effect transistor FET1 is connected to one end of the resistor R3.
- the drain of the field effect transistor FET1 is connected to the erroneous connection detector 233, one end of the resistor R6, and the gate of the field effect transistor FET2.
- the source of the field effect transistor FET2 is connected to the cathode of the rectifier diode D1.
- the drain of the field effect transistor FET2 is connected to the load limiting unit 232 and the terminal TP3.
- the gate of the field effect transistor FET3 is connected to the other end of the resistor R4 and one end of the resistor R5.
- the source of the field effect transistor FET3 is connected to one end of the resistor R4, the other end of the resistor R3, the anode of the rectifier diode D1, and the gate of the field effect transistor FET1.
- the drain of the field effect transistor FET3 may be connected to the anode of the photodiode 232a.
- the signal current Is increases due to some cause (for example, when the commercial power supply PS is erroneously connected between the communication line L2 and the shared line L3)
- the increase in the signal current Is causes an increase in the resistance R3.
- the voltage drop increases.
- the field effect transistor FET2 changes the drain-source voltage of the field effect transistor FET2 so that the voltage across the resistor R3 maintains an equilibrium state with the on-voltage of the gate-source voltage of the field effect transistor FET2.
- the gate-source voltage of the field effect transistor FET2 is adjusted. For this reason, the upper limit of the current Is flowing through the main transmitter 24 can be limited.
- the current limit control unit 231 limits the upper limit of the signal current Is, the voltage across the series resistance of the resistor R4 and the resistor R5 increases.
- the voltage across the resistor R4 which is a divided voltage of the voltage across both ends, exceeds the on-voltage (about 0.6 volts) between the source and drain of the field effect transistor FET3, the load limiting unit 232 The FET 3 is turned on, and the source and drain are made conductive.
- the gate-source voltage of the field effect transistor FET1 drops, the field effect transistor FET1 is cut off, and the drain current (signal current Is) of the field effect transistor FET1 is cut off.
- the secondary protection unit 35 may be formed of a field effect transistor.
- the main protection unit 23 is installed between the communication power supply unit 22 and the main communication unit 24, but is not limited thereto.
- the installation position of the main protection unit 23 may be anywhere, for example, between the main transmission unit 23 and the main reception unit 24 or between the main reception unit 25 and the resistor R1.
- the slave protection unit 35 is installed between the slave transmission unit 34 and the shared line L3, but is not limited thereto.
- the installation position of the slave protection unit 35 may be anywhere, for example, between the resistor R7 and the slave reception unit 33 or between the slave reception unit 33 and the slave transmission unit 34.
- Zener diodes 241 and 341 for limiting the voltage applied to the phototransistors 242b and 342b are arranged in the current path of the phototransistors 242b and 342b in the phototransistor 242b of the main transmitter 24 and the phototransistor 342b of the slave transmitter. Although connected in parallel, it is not limited to this.
- the voltage applied to the phototransistors 242b and 342b can be limited to the phototransistor 242b of the main transmitter 24 and the phototransistor 342b of the slave transmitter.
- a constant voltage circuit may be connected in parallel to the current path of the phototransistors 242b and 342b.
- the main air conditioner 11 is, for example, an outdoor unit
- the sub air conditioner 12 is, for example, an indoor unit, but is not limited thereto.
- the main air conditioner 11 may be, for example, an air conditioning controller
- the sub air conditioner 12 may be, for example, a blower controlled by the air conditioning controller.
- the combination of the main air conditioner 11 and the sub air conditioner 12 is not limited.
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Abstract
Description
主空調機11は、図2に示すように、主制御用電源部21と、通信用電源部22と、主保護部23と、主送信部24と、主受信部25と、抵抗R1と、整流ダイオード26と、ターミネータ部27と、主制御部28と、を備える。なお、主空調機11は、例えば熱交換器等の通常の空調制御用の構成を備えるが、ここでは、本願発明に関連する通信機能と保護機能に関連する部分を中心に示している。
信号電流Isは遮断される。
次に、図1に示す従空調機12の構成を説明する。各従空調機12は、それぞれ、図7に示すように、従制御用電源部31と、整流ダイオード32,36と、抵抗R7と、従受信部33と、従送信部34と、従保護部35と、従制御部37と、を備える。なお、各従空調機12は、通常の空調制御用の構成を備えるが、ここでは、本願発明に関連する通信機能と保護機能に関連する部分を中心に示している。
信号電流Isは遮断される。
上述した主空調機11および従空調機12のシリアル信号の送受信を具体的に説明する。主空調機11および従空調機12は、電源線L1、通信線L2および共用線L3で互いに接続され、電源線L1と共用線L3との間に商用電源PSが接続されると、シリアル信号の送受信が可能になる。
通信線L2と共用線L3との間に商用電源PSを誤接続した場合の従空調機12の保護動作および主空調機11の保護動作について説明する。
Claims (10)
- 電流を流す通信線、電力を伝送する電源線、および前記電流を流し且つ前記電力を伝送する共用線からなる接続線で主空調機と従空調機とが互いに接続されており、前記通信線を流れる電流のオン・オフの切り換えで生成される信号で前記主空調機と前記従空調機との双方向通信を実現する空調システムの保護装置であって、
電流路が前記通信線に直列に接続された第1のトランジスタと、
前記第1のトランジスタの電流路に流れる電流が設定電流以上となったときに、前記電流路の抵抗値が増加するように、前記第1のトランジスタを制御することにより前記電流路に流れる電流を制限する電流制限制御部と、
前記第1のトランジスタの電流路の両端間の電圧が設定電圧以上となったときに、前記第1のトランジスタをオフさせる電流遮断制御部と、
を備え、前記通信線に過電流が流れることを防止する保護装置。 - 前記電流遮断制御部は、前記第1のトランジスタの電流路の両端間の電圧に対応する電圧が印加され、前記両端間の電圧が設定電圧以上になったときにオンすることにより、前記第1のトランジスタの電流路の抵抗値を制御する制御端子間に印加される電圧を降下させて、前記第1のトランジスタをオフさせる第2のトランジスタから構成されている、
請求項1に記載の保護装置。 - 前記第2のトランジスタは、電流路の一端が前記第1のトランジスタの電流路の一端に接続され、電流路の他端が前記第1のトランジスタの電流路の抵抗値を制御する制御端子に接続され、前記第1のトランジスタの電流路の両端間の電圧に対応する電圧が第2のトランジスタを制御する制御端子間に印加され、前記第1のトランジスタの電流路の両端間に発生した電圧が設定電圧以上になったときにオンすることにより、前記第1のトランジスタの制御端子間に印加される電圧を降下させて、前記第1のトランジスタをオフさせる、
請求項2に記載の保護装置。 - 前記電流制限制御部は、前記第1のトランジスタの電流路に流れる電流に対応する電圧が印加され、前記第1のトランジスタの電流路に流れる電流が設定電流以上になったときにオンすることにより、前記第1のトランジスタの電流路の抵抗値を制御する制御端子間に印加される電圧を降下させて、前記第1のトランジスタの電流路の抵抗値を増加させる第3のトランジスタから構成されている、
請求項3に記載の保護装置。 - 前記電流制限制御部は、前記第1のトランジスタの電流路に流れる電流に対応する電圧を前記第3のトランジスタを制御する制御端子間に印加する抵抗を備え、
前記第3のトランジスタは、前記第1のトランジスタの電流路に流れる電流が設定電流以上になったときにオンすることにより、前記第1のトランジスタの電流路の抵抗値を制御する制御端子間に印加される電圧を降下させて、前記第1のトランジスタの電流路の抵抗値を増加させる、
請求項4に記載の保護装置。 - 前記第2のトランジスタがオンされたときに流れる電流がフォトダイオードに導通されることで、フォトトランジスタに信号を出力させる第1のフォトカプラを備える、
請求項5に記載の保護装置。 - 外部からの信号に応じて電流が流れるフォトダイオードおよびフォトダイオードの発光で電流路が導通され、その電流路が通信線に直列に接続されたフォトトランジスタを有する第2のフォトカプラと、
前記第2のフォトカプラのフォトトランジスタの電流路に並列に接続され、前記第2のフォトカプラのフォトトランジスタの電流路に印加される電圧を制限する電圧制限部と、
を備える請求項6に記載の保護装置。 - 前記通信線に電源が接続された場合に形成される閉回路の回路内に配置される、
請求項7に記載の保護装置。 - 前記保護装置は、主空調機と従空調機とに搭載される、
請求項1から8のいずれかに記載の保護装置。 - 電流を流す通信線、電力を伝送する電源線、および前記電流を流し且つ前記電力を伝送する共用線からなる接続線で主空調機と従空調機とが互いに接続されており、前記通信線を流れる電流のオン・オフの切り換えで生成される信号で前記主空調機と前記従空調機との双方向通信を実現する空調システムの保護装置の保護方法であって、
電流路が前記通信線に直列に接続された第1のトランジスタの前記電流路に流れる電流が設定電流以上となったときに、前記電流路の抵抗値が増加するように、前記第1のトランジスタを制御することにより前記電流路に流れる電流を制限する電流制限ステップと、
前記第1のトランジスタの電流路の両端間の電圧が設定電圧以上となったときに、前記第1のトランジスタをオフさせることにより、電流を遮断する電流遮断制御ステップと、
を含む、前記通信線に過電流が流れることを防止する保護方法。
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JP2015516801A JP6272315B2 (ja) | 2013-05-14 | 2013-05-14 | 保護装置および保護方法 |
US14/787,009 US10122164B2 (en) | 2013-05-14 | 2013-05-14 | Protection device and protection method |
PCT/JP2013/063450 WO2014184878A1 (ja) | 2013-05-14 | 2013-05-14 | 保護装置および保護方法 |
EP13884489.9A EP2998661B1 (en) | 2013-05-14 | 2013-05-14 | Protection device and protection method |
CN201380076559.6A CN105229388B (zh) | 2013-05-14 | 2013-05-14 | 保护装置以及保护方法 |
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EP3457509A1 (en) | 2017-09-14 | 2019-03-20 | Mitsubishi Heavy Industries Thermal Systems, Ltd. | Current controller, and electrical apparatus |
CN111756021A (zh) * | 2020-06-29 | 2020-10-09 | 深圳供电局有限公司 | 一种用于二分之三接线的线路保护电流二次回路 |
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Also Published As
Publication number | Publication date |
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CN105229388B (zh) | 2018-03-20 |
EP2998661B1 (en) | 2021-02-24 |
US20160105019A1 (en) | 2016-04-14 |
JPWO2014184878A1 (ja) | 2017-02-23 |
US10122164B2 (en) | 2018-11-06 |
JP6272315B2 (ja) | 2018-01-31 |
EP2998661A4 (en) | 2017-04-19 |
EP2998661A1 (en) | 2016-03-23 |
CN105229388A (zh) | 2016-01-06 |
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