JP2010101609A - Refrigerating cycle device, air conditioner provided therewith and water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a refrigerating cycle device performing erroneous wiring protection while saving substrate space and cost required for the erroneous wiring protection. <P>SOLUTION: A power supply circuit 2 and a communication power supply generation circuit 3 receiving electricity from an A.C. power supply 1 are installed in a heat source side unit 51 of an outdoor unit. A power supply circuit 11 and a zero-crossing circuit 12 for detecting zero-crossing of A.C. voltage supplied from the power source side unit 51 are installed in a use side unit 52 of the outdoor unit. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a refrigeration cycle apparatus, an air conditioner and a water heater provided with the refrigeration cycle apparatus, and more particularly to protection of an internal circuit against miswiring in two devices connected by a power supply line and a communication line.

  As an air conditioner equipped with a refrigeration cycle device having a protection function for a substrate and electronic components that constitute an internal circuit at the time of incorrect wiring of a conventional power supply line and signal line, an overvoltage detector is provided in a communication circuit terminal part, Some relay contacts, which are outputs, are connected in series to a communication circuit, and when an overvoltage is applied to the communication circuit, the communication circuit is immediately electrically disconnected from the communication circuit terminal (for example, see Patent Document 1).

JP 7-217972 A

  However, in the refrigeration cycle apparatus, an overvoltage detector is necessary for protection against miswiring, and further, a relay for circuit disconnection is also required. There was a problem such as high.

  The present invention has been made in order to solve the above-described problems. With regard to the board space and cost required for protection against miswiring, miswiring protection can be achieved with space saving or space 0 or cost saving or cost 0. It aims at obtaining the refrigerating cycle device which can carry out.

  A refrigeration cycle apparatus according to the present invention includes a use side unit and a heat source side unit connected via mutual connection ends by at least three lines, and the use side unit and the heat source side unit are each a communication circuit. One device of the use side unit and the heat source side unit receives an AC voltage from an AC power source, and the three devices with respect to the other device of the use side unit and the heat source side unit. By using two of the lines as an AC line, power is supplied via the connection end, and one of the other line and the AC line is configured to constitute the communication circuit. By using as a line, a current loop is formed, communication is performed via the connection end, and the other device receives zero AC voltage received from the one device. A zero-cross circuit for detecting a loss; determining an erroneous wiring of the three lines from an output of the zero-cross circuit; and when the erroneous wiring of the three lines is performed, the communication circuit is cut off. To do.

  Since the refrigeration cycle apparatus according to the present invention detects miswiring by diverting a zero cross circuit that is originally used for another purpose, the space and cost newly required for detecting miswiring are zero. Has an effect.

Embodiment 1 FIG.
FIG. 1 is a schematic diagram of a configuration circuit in the refrigeration cycle apparatus according to Embodiment 1, and FIG. 2 is a diagram showing a combination of wiring miswirings between a heat source side unit in an outdoor unit and a use side unit in an indoor unit. (Pattern (1) to Pattern (3)), and FIG. 3 is a diagram (Pattern (4) and Pattern (5)).
S1, S2 and S3 are terminal numbers of the terminal blocks of the heat source side unit 51 in the outdoor unit and the use side unit 52 in the indoor unit, and it is normal wiring to match the indoor and outdoor terminal numbers.

First, the circuit configuration of the heat source unit 51 in the outdoor unit will be described.
The AC power supply 1 outside the heat source side unit 51 is connected to both ends of the power supply circuit 2 installed in the heat source side unit 51. A diode D602, a resistor R607, and a Zener diode ZD602 connected in series are connected in parallel to both ends of the power supply circuit 2, and a connection point connecting the power supply circuit 2 and the diode D602 is connected to the terminal S1, and the power supply circuit 2 and the Zener diode ZD602 are connected to the terminal S2. A capacitor C603 is connected in parallel to both ends of the Zener diode ZD602, and the communication power generation circuit 3 is configured by the diode D602, the resistor R607, the Zener diode ZD602, and the capacitor C603.

  A transmission photocoupler PC602, a reception photocoupler PC601, a diode D601, and a resistor R601 are connected in series from the connection point between the resistor R607 and the Zener diode ZD602. The other end of the resistor R601 is connected to the terminal S3 of the terminal block. It is connected. Further, a resistor R602 and a capacitor C602 are connected in parallel to both ends of the reception photocoupler PC601. The terminals S3 and S2 are connected by a resistor R605, a diode D605, and a resistor R603 connected in series. A photocoupler PC603 is connected in parallel to both ends of the resistor R603, and the erroneous connection detection circuit 4 is formed by the resistor R605, the diode D605, the resistor R603, the photocoupler PC603, and other components not shown in FIG. Is configured.

Next, a circuit configuration of the use side unit 52 in the indoor unit will be described.
From the terminal S3, a resistor R132, a diode D132, a reception photocoupler IC132, and a transmission photocoupler IC131 are connected in series in this order, and finally connected to the terminal S2 to form a communication circuit. In addition, a diode D131 and a capacitor C134 are connected in parallel to both ends of the reception photocoupler IC132 and the transmission photocoupler IC131 connected in series. A resistor R133 and a capacitor C133 are connected in parallel to both ends of the reception photocoupler IC132.

  A power supply circuit 11 is connected to the terminals S1 and S2. In addition, a diode D122, a resistor R121, and a diode D121 connected in series are connected in parallel to both ends of the power supply circuit 11. A photocoupler IC 121 is connected to both ends of the diode D122. The photocoupler IC 121 is connected to the diode D122, the resistor R121, the diode D121, the photocoupler IC121, and other components not shown in FIG. A zero cross circuit 12 is configured.

Next, as shown in FIG. 1, the operation of the circuit when the wiring of the terminal blocks of the heat source side unit 51 and the usage side unit 52 is normally performed will be described.
The AC power supply 1 supplies an AC voltage to the power supply circuit 2, and the power supply circuit 2 generates a DC voltage to be supplied to internal IC components and the like. The AC voltage supplied from the AC power supply 1 is half-wave rectified by the diode D602, and the half-wave rectified current is current-limited by the resistor R607. Then, a constant voltage is generated by the Zener diode ZD602, and further smoothed by the capacitor C603 to generate a communication power supply of about 25V.

  A current loop is formed by the circuit configuration as described above in the heat source side unit 51 and the usage side unit 52 and the path connecting the terminals S3-S3 and S2-S2. Further, the resistor R601 in the heat source side unit 51 and the resistor R132 in the use side unit 52 limit the current flowing in this current loop and suppress overcurrent. In addition, the diode D601 in the heat source side unit 51 and the diode D132 in the usage side unit 52 limit the direction of current in the current loop. Then, the transmission photocoupler PC 602 in the heat source side unit 51 and the transmission photocoupler IC 131 in the usage side unit 52 generate an ON / OFF state of the current flowing in the current loop, and the reception photocoupler PC 601 and the usage side in the heat source side unit 51. The reception photocoupler IC 132 in the unit 52 detects ON / OFF of this current, so that the heat source side unit 51 and the usage side unit 52 communicate with each other.

  The incorrect connection detection circuit 4 detects an incorrect connection with respect to the AC power supply connection and the earth line connection in the heat source side unit 51.

  The zero cross circuit 12 detects the zero cross of the AC voltage input between the terminals S1 and S2 of the use side unit 52 from the heat source side unit 51. Then, an AC voltage is supplied from the terminals S1 and S2 to the power supply circuit 11 to generate a DC voltage to be supplied to internal IC components and the like.

Next, the operation when the heat source side unit 51 and the use side unit 52 are miswired will be described with reference to FIGS.
When the heat source side unit 51 receives power from the AC power source 1, an AC voltage may be applied to the low voltage circuit portion of the usage side unit 52, that is, the communication circuit due to an incorrect wiring between S1, S2, and S3 of the indoor / outdoor terminals. (See FIGS. 2 (2) and 3 (4)). At this time, a high-withstand-voltage photocoupler is used as the transmission photocoupler IC 131 to protect the diode D131 and the diode D132 from flowing current. However, when the transmission photocoupler IC 131 is turned on while an AC voltage is applied, there is a possibility that components used in the communication circuit are destroyed. For this reason, it is necessary to prevent the transmission photocoupler IC 131 from being turned ON during erroneous wiring.

  As one of the methods, miswiring between S1, S2 and S3 of the indoor / outdoor terminals can be achieved by diverting the zero cross circuit 12 used for other purposes such as detection of interruption of AC voltage input and a long-time timer. It is possible to prevent the transmission photocoupler IC 131 from being turned ON. In the erroneous wiring state shown in FIGS. 2 (2) and 2 (3) and FIGS. 3 (4) and 3 (5), no AC voltage is applied to the zero cross circuit 12, and the zero cross detection output is a microcomputer (not shown). Is not entered. As a result, it is possible to determine that the wiring is incorrect, so that the communication circuit can be protected by preventing the transmission photocoupler IC 131 from being turned on. Further, in the case of the normal wiring of FIG. 1 and the erroneous wiring of FIG. 2 (1), an AC voltage is applied to the zero-cross circuit 12, and the zero-cross detection output is input to the microcomputer. In the miswiring state of FIG. 2 (1), there is no destruction of the communication circuit because an AC voltage that is a high voltage is not applied to the communication circuit.

With the configuration and operation as described above, the zero cross circuit 12 used for other purposes is diverted to detect miswiring between the indoor and outdoor terminals S1, S2, and S3, and the transmission photocoupler IC 131 does not turn on. By doing so, the communication circuit can be protected.
In addition, since it is not necessary to add a new part or the like only for the purpose of protecting the miswiring, the miswiring protection can be implemented with zero space and zero cost.

  In the refrigeration cycle apparatus according to the first embodiment, the heat source side unit 51 in the outdoor unit receives an AC voltage from the AC power source 1 and generates a communication power source by the communication power source generation circuit 3 provided therein. The use side unit 52 in the indoor unit is configured to include the zero cross circuit 12. However, the configuration is not limited to this configuration, and the use side unit 52 in the indoor unit receives an AC voltage from the AC power source 1. The communication power generation circuit 3 may be received inside, and the heat source side unit 51 in the outdoor unit may include the zero cross circuit 12.

Embodiment 2. FIG.
FIG. 4 is a schematic diagram of the power supply circuit 11 of the usage-side unit 52 in the indoor unit of the refrigeration cycle apparatus according to Embodiment 2, and shows only the minimum necessary components. Hereinafter, the configuration and operation different from those of the first embodiment will be mainly described. In the second embodiment, a description will be given of a method of performing erroneous wiring protection for wiring between S1, S2, and S3 of the indoor / outdoor terminals when the zero-cross circuit 12 is not installed.

First, the circuit configuration of the power supply circuit 11 will be described with reference to FIG.
Terminals S1 and S2 in the use side unit 52 are connected to the input side of the diode bridge DB1. A smoothing capacitor C111 is connected in parallel to the output terminal of the diode bridge DB1. The primary side of the transformer T111 and the switching element IC111 connected in series are connected in parallel to both ends of the smoothing capacitor C111.

  The secondary side of the transformer T111, that is, one end of the output end of the transformer T111 is connected to the input terminal of the three-terminal regulator IC 112 via the diode D113. A smoothing capacitor C113 is connected to the other end of the input terminal of the three-terminal regulator IC 112 and the output end of the transformer T111. The other end of the output end of the transformer T111 is connected to the other end of the three-terminal regulator IC 112. It is connected to the COM terminal. A load resistor R1 is connected in parallel to both ends of the smoothing capacitor C113. The output terminal of the three-terminal regulator IC 112 is connected to one end of the smoothing capacitor C116, and the other end is connected to the COM terminal of the three-terminal regulator IC 112 and grounded. Further, the output terminal of the three-terminal regulator IC 112 is connected to the microcomputer 21 and the reset IC 22, and the output terminal of the reset IC 22 is connected to the microcomputer 21.

Next, the operation of the power supply circuit when the wiring of the terminal blocks of the heat source side unit 51 and the usage side unit 52 is normally performed will be described.
An AC voltage is supplied between the terminals S1 and S2 in the use side unit 52 from the terminals S1 and S2 in the heat source side unit 51, and the AC voltage is input to the diode bridge DB1 and full-wave rectified. The full-wave rectified voltage is smoothed by the smoothing capacitor C111. Further, when the voltage across the smoothing capacitor C111 reaches a predetermined voltage, the switching element IC111 is switched on and power energy is transmitted to the secondary side via the transformer T111.

  The voltage transmitted from the primary side via the transformer T111 is half-wave rectified by the diode D113. The half-wave rectified voltage is smoothed by the smoothing capacitor C113, and a VDD12V power source is generated at both ends of the smoothing capacitor C113. Further, this VDD12V power supply is dropped by a three-terminal regulator IC 112 to generate a VDD5V power supply that is a microcomputer driving power supply. This VDD5V power supply is smoothed by a smoothing capacitor C116. In addition, the reset IC 22 monitors VDD 5 V, which is a power source for driving the microcomputer, and outputs a reset signal to the microcomputer 21 in order not to drive the microcomputer 21 when the voltage is lower than a predetermined voltage.

Next, the operation when the heat source side unit 51 and the use side unit 52 are miswired will be described with reference to FIGS.
In the miswiring state shown in FIGS. 2 (2) and 2 (3) and FIGS. 3 (4) and 3 (5), an AC voltage is not directly input between the terminals S1 and S2 in the use side unit 52. Specifically, in FIGS. 2 (2) and 3 (5), the communication power source is input to the AC voltage terminal on the use side unit 52 side, and in FIGS. 2 (3) and 3 (4), The signal is input to the AC voltage terminal via the erroneous connection detection circuit 4.

  First, in the miswiring state shown in FIGS. 2 (2) and 3 (5), the communication power supply is only about 25V, and the current is limited by the resistors R607 and R601. The power supply capacity is very small. With this power supply, the voltage across the smoothing capacitor C111 rises and the switching element IC111 is turned on. However, the discharge caused by the switching element IC111 being switched on is larger than the charging of the smoothing capacitor C111. The voltage of the smoothing capacitor C111 greatly decreases due to the short-time switching ON operation. Therefore, the ON state of the switching element IC111 does not continue, and the switching operation is resumed when the voltage across the smoothing capacitor C111 reaches a predetermined voltage necessary for starting the switching element IC111 again. As a result, as shown in FIG. 5, the secondary side voltage is periodically charged and discharged repeatedly and is not stable. In FIG. 5, Ch1 is VDD12V, Ch2 is VDD5V, and Ch3 is the output of the reset IC 22 (Hi is in the reset release state). At this time, by connecting an appropriate load resistor R1 to both ends of the smoothing capacitor C113 that generates VDD12V, VDD12V does not rise sufficiently in a state where the power supply capability at the time of incorrect wiring is low. Further, VDD5V generated based on this cannot be raised sufficiently, and the reset can be prevented from being released by being kept lower than a voltage at which the reset IC 22 releases the reset (hereinafter referred to as a reset release voltage). Generally, since the input / output voltage difference of the three-terminal regulator is about 2V, for example, when the reset release voltage by the reset IC 22 is 4V, the MAX value of VDD12V is set when the power supply capability at the time of incorrect wiring is low. By connecting the load resistor R1 that is 6V or less, it is possible to prevent the reset IC 22 from releasing the reset.

  Next, in the miswiring state shown in FIGS. 2 (3) and 3 (4), the voltage divided by the impedance of the power supply circuit 11 in the misconnection detection circuit 4 and the use side unit 52 is the use side unit 52. Applied to the terminals S1 and S2. The resistor R605 has a resistance value as large as 100 kΩ, and the voltage applied to the terminals S1 and S2 in the usage-side unit 52 is kept low, and the current is also greatly reduced. Therefore, as in the case of the miswiring state of FIGS. 2 (2) and 3 (5), the power supply power to the use side unit 52 is very small, and the rise of VDD12V and VDD5V by this supply Is suppressed by the connection of the load resistor R1, and the reset cancellation by the reset IC 22 can be prevented.

  Of course, the value of the load resistance R1 needs to be a value that does not cause a problem with the power supply rise in the normal wiring shown in FIG. 1, but as described above, in the normal wiring in FIG. ) And the miswiring state in FIGS. 3 (1) and 3 (2), there is a clear difference in power supply capability, so that the setting can be made without any problem. Further, in the miswiring state of FIG. 2 (1), no high voltage AC voltage is applied to the communication circuit, so there is no destruction of the communication circuit.

In the erroneous wiring state shown in FIGS. 2 (2) and (3) and FIGS. 3 (4) and (5), the microcomputer by the reset IC 22 is connected by connecting the load resistor R1. Therefore, the transmission photocoupler IC 131 is not turned on, and the communication circuit can be protected.
Moreover, since the above-described erroneous wiring protection can be achieved only by adding the load resistor R1, space saving and cost saving can be realized.

  In the refrigeration cycle apparatus according to the second embodiment, the heat source side unit 51 in the outdoor unit receives AC voltage from the AC power source 1, supplies the AC voltage to the use side unit 52 in the indoor unit, and The use side unit 52 in the indoor unit includes the power supply circuit 11 that enables the above-described erroneous wiring protection. However, the use side unit 52 in the indoor unit is not limited to this configuration. The AC voltage is received from the AC source, the AC voltage is supplied to the heat source side unit 51 in the outdoor unit, and the power supply circuit 2 provided in the heat source side unit 51 in the outdoor unit enables the above-described erroneous wiring protection. Also good.

Embodiment 3 FIG.
In the following description of the third embodiment, the configuration and operation different from those of the second embodiment will be mainly described.
In the second embodiment, the load resistor R1 is provided on the secondary side of the transformer T111. However, in the third embodiment, as shown in FIG. 4, the both ends of the smoothing capacitor C111 on the primary side are provided. The load resistor R2 is connected in parallel.

  At this time, an appropriate load resistor R2 is provided in a state where the power supply capability is low in the erroneous wiring state shown in FIGS. 2 (2) and (3) and FIGS. 3 (4) and (5). As a result, the voltage across the smoothing capacitor C111 does not rise sufficiently. Based on this, VDD12V and VDD5V generated via the transformer T111 cannot sufficiently rise, and the reset by the reset IC 22 can be prevented from being released. However, the load resistor R2 needs to have a resistance value that does not hinder power supply operation during normal wiring.

With the configuration and operation as described above, in the miswiring state shown in FIGS. 2 (2) and (3) and FIGS. 3 (4) and (5), the microcomputer by the reset IC 22 is connected by connecting the load resistor R2. Therefore, the transmission photocoupler IC 131 is not turned on, and the communication circuit can be protected.
In addition, the above-described erroneous wiring protection can be achieved only by adding the load resistor R2, so that space and cost can be saved.

Further, by providing an appropriate load resistor R2 and sufficiently suppressing the rise of the voltage across the smoothing capacitor C111, the switching element IC111 can be switched off.
As a result, the supply of voltage to the secondary side of the transformer T111 can be cut off and the start of the microcomputer 21 can be stopped, so that the transmission photocoupler IC 131 is not turned on and the communication circuit can be protected.
Moreover, it is also possible to realize protection against miswiring by combining the second and third embodiments.

Embodiment 4 FIG.
FIG. 6 is a secondary side voltage waveform diagram in the case where a delay is provided until reset release at the time of erroneous wiring in the refrigeration cycle apparatus according to Embodiment 4. In the following description of the fourth embodiment, the configuration and operation different from those of the second and third embodiments will be mainly described.

  In the second and third embodiments, a load resistor R1 is provided in the second embodiment and a load resistor R2 is provided in the third embodiment so that the reset by the reset IC 22 is not released. However, in the fourth embodiment, there is a delay from when the VDD 5 V reaches the reset release voltage until the reset IC 22 performs the reset release. As a result, the reset by the reset IC 22 can be prevented from being released in a short time when VDD5V is equal to or higher than the reset release voltage. As shown in FIG. 6, although VDD5V is equal to or higher than the reset release voltage, it can be confirmed that the reset is not released by providing the above delay. However, it is necessary to suppress the delay of the reset release time within a time that does not hinder control during normal wiring.

In the erroneous wiring state shown in FIGS. 2 (2) and (3) and FIGS. 3 (4) and (5) by the above configuration and operation, resetting is performed by providing a delay until the reset is released by the reset IC 22. Since the release can be prevented, the transmission photocoupler IC 131 is not turned on, and the communication circuit can be protected.
In addition, by providing the above delay, it is possible to prevent the reset IC 22 from releasing the reset, so that the resistance value of the load resistor R1 or the load resistor R2 can be set high. Power consumption can be reduced.

  When there is no delay and the reset release time is very short, it is possible to eliminate the need for installing the load resistor R1 and the load resistor R2 by providing this delay.

Embodiment 5 FIG.
FIG. 7 is a power supply circuit diagram in which the power consumption at the load resistance is zero during the normal wiring operation of the refrigeration cycle apparatus according to the fifth embodiment. In the following description of the fifth embodiment, the configuration and operation that are different from those of the above-described second to fourth embodiments will be mainly described.

  In FIG. 7, the output terminal of the three-terminal regulator IC 112 is connected to the emitter of the PNP transistor Q1. The collector of the PNP transistor Q1 is connected to the base of the NPN transistor Q2. Further, the other end of the load resistor R1 whose one end is connected to the input terminal of the three-terminal regulator IC 112 is connected to the collector of the NPN transistor Q2. The emitter of the NPN transistor Q2 is connected to one end of the smoothing capacitor C113 and is grounded. Further, the base of the PNP transistor Q1 is connected to the output terminal of the reset IC 22 and the microcomputer 21.

Next, the operation of the power supply circuit 11 shown in FIG. 7 will be described with reference to Table 1 showing an outline of the operation.
When VDD5V is equal to or lower than the reset release voltage when the power is turned on, the output of the reset IC 22 is Lo, and this output is transmitted to the microcomputer 21 and is in the reset state. When this VDD5V rises to a certain voltage, the base-emitter voltage of the PNP transistor increases and the PNP transistor is turned on. Then, the base of the NPN transistor Q2 becomes Hi, the base-emitter voltage of the NPN transistor Q2 increases, and the NPN transistor is turned on. As a result, the load resistor R1 is energized.

  Next, when the voltage of VDD5V becomes equal to or higher than the reset release voltage, the output of the reset IC 22 becomes Hi, and the PNP transistor Q1 is turned off. The base of the NPN transistor Q2 is also Lo, and the NPN transistor Q2 is turned off. As a result, the current flowing through the load resistor R1 is cut off by the NPN transistor Q2, and the load resistor R1 is not energized.

With the configuration and operation as described above, the power consumption in the load resistor R1 can be reduced to zero because the load resistor R1 is not energized after the reset is released during normal wiring.
Further, in the miswiring state shown in FIGS. 2 (2) and 2 (3) and FIGS. 3 (4) and 3 (5), the load resistor R1 is energized, so that the communication circuit can be protected.
The circuit configuration as described above can be realized only by adding two transistors and the load resistor R1, and space saving and cost saving can be realized.

  It is also possible to realize erroneous wiring protection by combining Embodiments 2 to 4 and Embodiment 5.

Embodiment 6 FIG.
FIG. 8 is a diagram showing the communication start delay time provided by the program of the microcomputer 21 in the refrigeration cycle apparatus according to Embodiment 6. In the following description of the sixth embodiment, the configuration and operation that are different from those of the second embodiment will be mainly described.

  In the second embodiment, in order to prevent the reset by the reset IC 22 from being released, the load resistor R1 is provided to suppress the rise of VDD5V and the reset by the reset IC 22 is not released. 6, the rise of VDD5V itself is not suppressed by hardware such as electronic components, but a predetermined delay time until the start of communication by the program of the microcomputer 21 after the reset is released by the reset IC 22 by the rise of VDD5V, that is, the start of communication A delay time t is provided. By providing this communication start delay time t, since the power supply capability is low in the miswiring state shown in FIGS. 2 (2) and (3) and FIGS. 3 (4) and (5), the communication start is started. Since VDD5V decreases at the delay time t, the reset state is resumed.

With the configuration and operation as described above, the transmission photocoupler IC 131 is not turned on, and the communication circuit can be protected.
In addition, since incorrect wiring can be protected not by hardware such as electronic components but by software that is a program of the microcomputer 21, space 0 and cost 0 can be realized.

  It is also possible to realize erroneous wiring protection by combining Embodiments 2 to 5 and Embodiment 6.

Embodiment 7 FIG.
FIG. 9 is a schematic diagram of a configuration circuit in the refrigeration cycle apparatus according to the seventh embodiment. In the following description of the seventh embodiment, the configuration and operation that are different from those of the second embodiment will be mainly described.

  The power supply circuit 11 in the use side unit 52 is provided with a low input voltage detecting means 31 for detecting a rectified and smoothed voltage in parallel with the C111 so that the switching ON / OFF operation of the switching element IC111 can be performed by the detected voltage. Wired to

  As described in the second embodiment, in the state where the power supply capability is low in the erroneous wiring state shown in FIGS. 2 (2) and (3) and FIGS. 3 (4) and (5). A low voltage is applied between the terminals S1 and S2 in the use side unit 52, and the voltage applied to both ends of C111 is reduced. At this time, when the low input voltage detection means 31 detects a low input to the power supply circuit 11 in the usage side unit 52 and the voltage is lower than a predetermined voltage, the switching element IC111 is switched off.

  With the configuration and operation as described above, the supply of voltage to the secondary side of the transformer T111 can be cut off and the start of the microcomputer 21 can be stopped, so that the transmission photocoupler IC 131 is not turned on and the communication circuit is protected. Is possible.

Some existing switching elements have a low input voltage detection function and are switched off when a low voltage is detected, and this can also be used.
In this case, this function can be used without adding a sensing resistor or without additional parts, and space and cost can be saved.
Here, the use of the low input voltage detection function has been described, but the switching start activation voltage is higher than the low voltage input in the miswiring state diagrams 2 (2) and (3) and FIGS. 3 (4) and (5). The same effect can be obtained by using a switching element.

Embodiment 8 FIG.
FIG. 10 is an example of a configuration diagram when the refrigeration cycle apparatus according to Embodiments 1 to 7 is mounted on an air conditioner.
The refrigerant flow path circulating inside the refrigeration cycle in the air conditioner according to Embodiment 8 starts with the compressor 61 in the outdoor unit 101, the four-way valve 62, the first heat exchanger 63, and the expansion valve 64. And flows out of the outdoor unit 101. The refrigerant that has flowed out of the outdoor unit 101 flows out of the indoor unit 102 via the second heat exchanger 65 in the indoor unit 102. Then, the refrigerant that has flowed out of the indoor unit 102 returns to the compressor 61 via the four-way valve 62 in the outdoor unit 101 again.

  The first heat exchanger 63 exchanges heat with the outside air, and the second heat exchanger 65 exchanges heat with the indoor air.

  The heat source unit 51 is installed in the outdoor unit 101 and supplied with an AC voltage from an external AC power supply 1. Further, the use side unit 52 is installed in the indoor unit 102 and is electrically connected to the heat source side unit 51 in the outdoor unit 101 by the configuration described in the first to seventh embodiments.

  With the above configuration, an air conditioner including the refrigeration cycle apparatus with the erroneous wiring protection described in the first to seventh embodiments can be obtained.

  The configuration of the air conditioner shown in FIG. 10 is merely an example, and the refrigeration cycle apparatus according to Embodiments 1 to 7 may be mounted using different configurations.

Embodiment 9 FIG.
FIG. 11 is an example of a configuration diagram when the refrigeration cycle apparatus according to Embodiments 1 to 7 is mounted on a water heater.
In the refrigeration cycle unit 111, the compressor 61, the radiator 67, the expansion valve 64, and the evaporator 66 constitute a refrigeration cycle. The refrigerant flow path circulating inside the refrigeration cycle returns from the compressor 61 to the compressor 61 again via the radiator 67, the expansion valve 64, and the evaporator 66.

  In the heat storage circuit unit 112, a water circulation cycle is configured by the pump 69, the radiator 67 and the tank 68. The flow path of the water circulating inside the water circulation cycle returns to the pump 69 from the pump 69 via the radiator 67 and the tank 68 again.

  The water in the water circulation cycle is supplied with thermal energy from the refrigerant in the refrigeration cycle via the radiator 67, and the water whose temperature has been increased is stored in the tank 68.

  The heat source side unit 51 is installed in the refrigeration cycle unit 111 and is supplied with an AC voltage from an external AC power source 1. Moreover, the use side unit 52 is installed in the heat storage circuit unit 112 and is electrically connected to the heat source side unit 51 in the refrigeration cycle unit 111 by the configuration described in the first to seventh embodiments. Yes.

  With the above configuration, it is possible to obtain a water heater including the refrigeration cycle apparatus to which erroneous wiring protection described in the first to seventh embodiments is applied.

  The configuration of the water heater shown in FIG. 11 is merely an example, and the refrigeration cycle apparatus according to Embodiments 1 to 7 may be mounted using different configurations.

1 is a schematic diagram of a configuration circuit in a refrigeration cycle apparatus according to Embodiment 1. FIG. It is a figure (pattern (1)-pattern (3)) which shows the combination of the miswiring of the wiring of the heat-source side unit in an outdoor unit, and the utilization side unit in an indoor unit. It is a figure (pattern (4) and pattern (5)) which shows the combination of the miswiring of the wiring of the heat-source side unit in an outdoor unit, and the utilization side unit in an indoor unit. It is the schematic of the power supply circuit 11 of the utilization side unit 52 in the indoor unit of the refrigerating-cycle apparatus which concerns on Embodiment 2. FIG. It is the voltage waveform of the secondary side at the time of incorrect wiring. It is a secondary side voltage waveform figure at the time of giving a delay until reset cancellation | release at the time of the incorrect wiring in the refrigerating-cycle apparatus which concerns on Embodiment 4. FIG. 10 is a power supply circuit diagram in which power consumption in a load resistance is zero during operation during normal wiring of a refrigeration cycle apparatus according to Embodiment 5. It is a figure which shows the communication start delay time provided by the program of the microcomputer in the refrigeration cycle apparatus which concerns on Embodiment 6. FIG. 10 is a schematic diagram of a configuration circuit in a refrigeration cycle apparatus according to Embodiment 7. FIG. It is an example of the block diagram at the time of mounting the refrigerating-cycle apparatus which concerns on Embodiment 1- Embodiment 7 in an air conditioner. It is an example of the block diagram at the time of mounting the refrigeration cycle apparatus which concerns on Embodiment 1- Embodiment 7 in a water heater.

Explanation of symbols

  1 AC power supply, 2 power supply circuit, 3 communication power generation circuit, 4 erroneous connection detection circuit, 11 power supply circuit, 12 zero cross circuit, 21 microcomputer, 22 reset IC, 31 low input voltage detection means, 51 heat source side unit, 52 use side Unit, 61 Compressor, 62 Four-way valve, 63 First heat exchanger, 64 Expansion valve, 65 Second heat exchanger, 66 Evaporator, 67 Radiator, 68 Tank, 69 Pump, 101 Outdoor unit, 102 Indoor unit, 111 refrigeration cycle unit, 112 heat storage circuit unit, C111, C113, C116 smoothing capacitor, C133, C134, C602, C603 capacitor, D113, D121, D122, D131, D132, D601, D602, D605 diode, DB1 diode bridge, IC111 switching Element, IC112 3-terminal regulator, IC121_photocoupler, IC131 transmission photocoupler, IC132 reception photocoupler, PC601 reception photocoupler, PC602 transmission photocoupler, PC603 photocoupler, Q1 PNP transistor, Q2 NPN transistor, R1, R2 load resistance, R121, R132, R133, R601, R602, R603, R605, R607 Resistor, T111 transformer, ZD602 Zener diode.

Claims (13)

Comprising a use side unit and a heat source side unit connected via mutual connection ends by at least three wires,
The utilization side unit and the heat source side unit each have a communication circuit,
One device of the use side unit and the heat source side unit is:
Receive AC voltage from AC power source,
By using two of the three wires as an AC line to the other device of the use side unit and the heat source side unit, power is supplied via the connection end, and By using one line of one line and the AC line as a communication line constituting the communication circuit, a current loop is formed, and communication is performed via the connection end.
The other device has a zero cross circuit that detects a zero cross of the AC voltage received from the one device,
Determine the miswiring of the three lines from the output of the zero cross circuit,
The refrigeration cycle apparatus, wherein the communication circuit is cut off when the three wires are miswired. Comprising a use side unit and a heat source side unit connected via mutual connection ends by at least three wires,
The utilization side unit and the heat source side unit each have a communication circuit,
One device of the use side unit and the heat source side unit is:
Receive AC voltage from AC power source,
By using two of the three wires as an AC line to the other device of the use side unit and the heat source side unit, power is supplied via the connection end, and By using one line of one line and the AC line as a communication line constituting the communication circuit, a current loop is formed, and communication is performed via the connection end.
The other device is
A power supply circuit for converting an AC voltage supplied from the AC line into a DC voltage;
A microcomputer for controlling the communication circuit;
Resetting means for monitoring the microcomputer driving power supply voltage supplied to the microcomputer and preventing the microcomputer from being driven by resetting when the microcomputer driving power supply voltage is lower than a predetermined voltage;
Have
The power supply circuit has reset release prevention means for preventing the reset state of the microcomputer from being released when the three wires are miswired;
The refrigeration cycle apparatus characterized in that the communication circuit is shut off by maintaining the microcomputer in a reset state and preventing the microcomputer from being driven when the three wires are miswired. The power supply circuit is
A primary circuit for rectifying and smoothing an AC voltage supplied from the AC line;
A secondary side circuit connected to the primary side circuit via a transformer and having a secondary side rectifying means for rectifying the voltage converted by the transformer, and a secondary side smoothing capacitor for smoothing the rectified voltage. When,
Have
The refrigeration cycle apparatus according to claim 2, wherein the reset release prevention unit includes a secondary side load resistor connected in parallel to the secondary side smoothing capacitor. The power supply circuit is
A primary side circuit having a primary side rectifying means for rectifying an AC voltage supplied from the AC line, and a primary side smoothing capacitor for smoothing the rectified voltage;
A secondary circuit connected to the primary circuit via a transformer and rectifying and smoothing a voltage converted by the transformer;
Have
The refrigeration cycle apparatus according to claim 2, wherein the reset release prevention unit includes a primary side load resistor connected in parallel to the primary side smoothing capacitor. The refrigeration according to any one of claims 2 to 4, wherein the reset unit releases the reset after a predetermined delay time has elapsed since the microcomputer drive power supply voltage becomes higher than the predetermined voltage. Cycle equipment. Comprising a use side unit and a heat source side unit connected via mutual connection ends by at least three wires,
The utilization side unit and the heat source side unit each have a communication circuit,
One device of the use side unit and the heat source side unit is:
Receive AC voltage from AC power source,
By using two of the three wires as an AC line to the other device of the use side unit and the heat source side unit, power is supplied via the connection end, and By using one line of one line and the AC line as a communication line constituting the communication circuit, a current loop is formed, and communication is performed via the connection end.
The other device is
A power supply circuit for converting an AC voltage supplied from the AC line into a DC voltage;
A microcomputer that controls the communication circuit in the previous term;
Resetting means for monitoring the microcomputer driving power supply voltage supplied to the microcomputer and preventing the microcomputer from being driven by resetting when the microcomputer driving power supply voltage is lower than a predetermined voltage;
Have
The reset means releases the reset after a lapse of a predetermined delay time after the microcomputer drive power supply voltage becomes higher than the predetermined voltage, so that when the three lines are miswired, the reset means The refrigeration cycle apparatus characterized in that the communication circuit is cut off by maintaining the reset state and preventing its drive. The refrigeration cycle apparatus according to claim 3, wherein the power supply circuit cuts off a current flowing through the secondary load resistor when the microcomputer is in a reset release state. The power supply circuit has load current interruption means connected in series to the secondary load resistor,
The refrigeration cycle apparatus according to claim 7, wherein the load current interrupting means interrupts a current flowing through the secondary load resistor by being in an interrupted state when a reset signal is output from the reset means. The refrigeration cycle apparatus according to any one of claims 2 to 8, wherein the microcomputer starts communication by the communication circuit after a predetermined delay time elapses after the reset is canceled by the reset means. . Comprising a use side unit and a heat source side unit connected via mutual connection ends by at least three wires,
The utilization side unit and the heat source side unit each have a communication circuit,
One device of the use side unit and the heat source side unit is:
Receive AC voltage from AC power source,
By using two of the three wires as an AC line to the other device of the use side unit and the heat source side unit, power is supplied via the connection end, and By using one line of one line and the AC line as a communication line constituting the communication circuit, a current loop is formed, and communication is performed via the connection end.
The other device is
A power supply circuit for converting an AC voltage supplied from the AC line into a DC voltage;
A microcomputer that controls the communication circuit in the previous term;
Resetting means for monitoring the microcomputer driving power supply voltage supplied to the microcomputer and preventing the microcomputer from being driven by resetting when the microcomputer driving power supply voltage is lower than a predetermined voltage;
Have
The microcomputer starts communication by the communication circuit after a predetermined delay time has elapsed since the reset is released by the reset means, so that the reset means resets the microcomputer when the three lines are miswired. The refrigeration cycle apparatus is characterized in that the communication circuit is put into a cut-off state by maintaining the flow rate and preventing the drive thereof. Comprising a use side unit and a heat source side unit connected via mutual connection ends by at least three wires,
The utilization side unit and the heat source side unit each have a communication circuit,
One device of the use side unit and the heat source side unit is:
Receive AC voltage from AC power source,
By using two of the three wires as an AC line to the other device of the use side unit and the heat source side unit, power is supplied via the connection end, and By using one line of one line and the AC line as a communication line constituting the communication circuit, a current loop is formed, and communication is performed via the connection end.
The other device is
A power supply circuit for converting an AC voltage supplied from the AC line into a DC voltage;
Have
The power supply circuit is
A primary side circuit having a primary side rectifying means for rectifying an AC voltage supplied from the AC line, and a primary side smoothing capacitor for smoothing the rectified voltage;
A low input voltage detecting means for detecting a voltage of the AC line for supplying an AC voltage to the power supply circuit or a voltage applied to the primary side smoothing capacitor;
Switching means for transmitting the energy on the primary side to the secondary side;
Have
When the low input voltage detection means detects a voltage lower than a predetermined voltage, the switching means does not perform switching so that energy is not transmitted to the secondary side when the three lines are miswired, Since the secondary side power supply does not start up, the microcomputer does not start and the communication circuit is cut off. An air conditioner equipped with the refrigeration cycle apparatus according to any one of claims 1 to 11. A water heater equipped with the refrigeration cycle apparatus according to any one of claims 1 to 11.

Images