JP2017223409A - Power control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly lower a residual voltage to be discharged from an indoor unit, in an air conditioner.SOLUTION: A power control device (101) includes a power supply stop circuit (30) for stopping power supply to an outdoor unit (2) from an indoor unit (1) when shutdown of power supply from an external power source to the indoor unit (1) is detected during operation of an air conditioner (100).SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power control device for an air conditioner.

  Conventionally, an air conditioner is provided with a discharge resistor because if the power plug is removed during operation, the user may be electrocuted by the residual voltage due to the charge accumulated in the noise removing capacitor of the indoor unit. As a countermeasure for reducing such a residual voltage, for example, in Patent Document 1, when the interruption of the power supply from the AC power supply is detected, switching to a resistance element having a lower resistance value is performed to quickly discharge the residual voltage. A technique for lowering is disclosed.

JP 2006-246666 A (published September 14, 2006)

  By the way, in an air conditioner divided into an indoor unit and an outdoor unit, a so-called separate type air conditioner, electric power is supplied from the indoor unit to the outdoor unit, and it is necessary to consider the residual voltage described below. Usually, a relay (main relay) is mounted to turn on / off the power supply from the indoor unit to the outdoor unit. The operation control of the relay is performed by a microcomputer (microcomputer) in the indoor unit. For example, if the power plug is pulled out during operation, the condenser on the indoor unit will be discharged, and when the voltage supplied to the microcomputer falls below a predetermined value (for example, 2.7 V), the microcomputer will stop, and the cut-off signal will be relayed The relay is turned off and the power supply to the outdoor unit is stopped.

  Here, the time from when the power plug is removed until the microcomputer stops (the time until the interruption signal is output to the relay) greatly depends on the capacitance of the smoothing capacitor in the power circuit. The smoothing capacitor needs a certain amount of capacitance in order to store the voltage supplied to each member of the indoor unit. For this reason, it takes time for the voltage supplied to the microcomputer to be equal to or lower than the above-mentioned predetermined value by removing the power plug and discharging the voltage accumulated in the smoothing capacitor (hereinafter referred to as accumulated voltage).

  Therefore, in the conventional separate type air conditioner, even if the power plug is pulled out during operation, the power supply from the indoor unit to the outdoor unit is maintained without being interrupted for a while. Here, as described above, in the air conditioner, the circuit on the indoor unit side is provided with a noise removing capacitor. For this reason, a residual voltage exists between the insertion blades of the power plug until the electric charge accumulated in the noise removing capacitor is discharged.

  In the air conditioner, the circuit on the outdoor unit side is also provided with a noise removing capacitor as in the indoor unit side. For this reason, in the state where the relay is ON, the residual voltage on the outdoor unit side is transmitted to the indoor unit side.

  By the way, in an electric product such as an air conditioner, a reference value (reference voltage) of a residual voltage is generally set in consideration of user safety. This is to avoid the danger of the user being shocked by a high residual voltage after the user unplugs the power plug.

  Specifically, in the “Electrical Appliance and Material Safety Law (hereinafter referred to as the Electric Safety Law) Ministerial Ordinance First Attached Table 8”, the user unplugs the power plug with the peak voltage applied during operation of the electrical product. One second after the point of time (the point at which power supply from the power source to the electrical product is cut off), the voltage between the blades of the power plug (residual voltage) is required to be 45 V (reference voltage) or less. Yes.

  By the way, it is preferable that the time for reducing the residual voltage to the reference voltage or less is as short as possible. An object of the present invention is to realize a power control device for an air conditioner that can quickly reduce a residual voltage to be discharged in an indoor unit.

  In order to solve the above problems, a power control apparatus according to one embodiment of the present invention includes an indoor unit to which power is supplied from an external power source and an outdoor unit to which power is supplied from the indoor unit during operation. A power control device for an air conditioner, wherein when the interruption of power supply from the power source to the indoor unit is detected during operation of the air conditioner, power supply from the indoor unit to the outdoor unit is performed. A power supply stop circuit for stopping is included.

  According to the power control device of one embodiment of the present invention, the air conditioner has an effect that it is possible to quickly reduce the residual voltage to be discharged in the indoor unit.

It is a block diagram of the electric power control apparatus which concerns on Embodiment 1 of this invention. It is a schematic block diagram of the air conditioner carrying the said power control apparatus. It is a block diagram of the electric power control apparatus which concerns on Embodiment 2 of this invention. It is a block diagram of the electric power control apparatus which concerns on Embodiment 3 of this invention.

Embodiment 1
Hereinafter, Embodiment 1 of the present invention will be described in detail with reference to FIGS. 1 and 2.

(Air conditioner 100)
First, the outline of the air conditioner 100 (air conditioner, air conditioner) of the present embodiment will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of an air conditioner 100 equipped with a power control device 101 described later.

  In FIG. 2, for the sake of simplicity, of the various members of the air conditioner 100, members that are not related to the present embodiment are not shown. Each member not shown in the figure may be understood to be the same as a known member.

  The air conditioner 100 is a device that adjusts the temperature, humidity, air cleanliness, and the like of an air-conditioned space (for example, a room). As shown in FIG. 2, the air conditioner 100 is a separate type air conditioner composed of an indoor unit 1 and an outdoor unit 2. In FIG. 2, the wall-mounted indoor unit 1 is illustrated, but the indoor unit 1 may be a ceiling-mounted type or a floor-standing type.

  The indoor unit 1 is provided with a plug 4 for inputting AC power. By inserting the plug 4 into the outlet 5 in the room, AC power for driving each member (each electric component) of the indoor unit 1 is converted to an external power source (for example, commercial power source) (not shown) through the plug 4. ) Can be supplied to the indoor unit 1.

  The indoor unit 1 is connected to the outdoor unit 2 via the pipe 3. A wiring (not shown) for supplying electric power from the indoor unit 1 to the outdoor unit 2 is provided inside the pipe 3. When the air conditioner 100 is in operation, the outdoor unit 2 is supplied with electric power from the indoor unit 1 via the wiring in the pipe 3. Thereby, each member (each electric component) of the outdoor unit 2 is driven.

(Power control device 101)
Next, a specific configuration of the power control apparatus 101 will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a main part of the power control apparatus 101. In FIG. 1, the voltage of the AC power supplied to the indoor unit 1 (air conditioner 100) through the plug 4 connected to the outlet 5 (FIG. 2) is represented as E. The waveform of the voltage E is, for example, a sine wave having an effective value of 100 V and a frequency of 60 Hz.

  The power control device 101 is a control device (control circuit) provided inside the indoor unit 1. As will be described below, the power control apparatus 101 controls (adjusts) the power supplied to each member of the indoor unit 1 and the outdoor unit 2. The power control apparatus 101 has a function of stopping power supply from the indoor unit 1 to the outdoor unit 2.

  The power control apparatus 101 includes a smoothing circuit 10 (power supply connection unit), a power supply circuit 20, a power supply stop circuit 30, a main relay signal terminal 40, diodes 48a and 48b, and a main relay 49. Hereinafter, each member of the power control apparatus 101 will be described. However, in the present embodiment, description of parts that are the same as known ones will be omitted as appropriate.

  In FIG. 1, a case where a DC voltage (power supply voltage) of 12 V is supplied to the main relay 49 is illustrated.

(Smoothing circuit 10)
The smoothing circuit 10 is connected to the plug 4 via terminals T1 and T2. Here, each of the terminals T1 and T2 is a contact point with the insertion blade of the plug 4. When the plug 4 is inserted into the outlet 5, the smoothing circuit 10 is connected to an external power source. In this case, the voltage E is applied between the terminals T1 and T2. On the other hand, when the plug 4 is removed from the outlet 5, the smoothing circuit 10 is disconnected from the external power source. In this case, the terminal T1-T2 is open.

  FIG. 1 illustrates the case where the plug 4 is inserted into the outlet 5 (in other words, the voltage between the insertion blades of the plug 4 is equal to the voltage E described above). However, in FIG. 1, for convenience of explanation, the voltage between the insertion blades of the plug 4 (residual voltage Vr) when the plug 4 is removed from the outlet 5 is shown in parentheses.

  FIG. 1 also shows a noise removing capacitor 92 provided in the circuit on the outdoor unit 2 side. The noise removing capacitor 92 functions as a noise filter on the outdoor unit 2 side. As described above, when the plug 4 is removed from the outlet 5, the residual voltage Vr exists between the insertion blades of the plug 4 until the charge accumulated in the noise removing capacitor 92 is discharged. .

  The smoothing circuit 10 is a circuit that rectifies and smoothes the AC power voltage E (AC voltage) supplied from the external power source to the indoor unit 1 through the plug 4 when the plug 4 is inserted into the outlet 5. It is. The smoothing circuit 10 includes a diode 11, resistors 12 and 13, a rectifier circuit 14, a smoothing capacitor 15, resistors 16 and 17, and a noise removing capacitor 91.

  The diode 11 is an element for rectifying the voltage E and applying it to the resistors 12 and 13. The resistors 12 and 13 are elements for dividing the voltage E rectified by the diode 11. Here, a voltage at a node (hereinafter referred to as a node N) where the resistor 12 and the resistor 13 are connected to each other is represented as VN. Hereinafter, this voltage VN is also referred to as a detection voltage.

  As shown in FIG. 1, the node N is connected to a negative input terminal (inverted input terminal) of a comparator 32 described later. For this reason, the voltage VN is applied to the negative input terminal of the comparator 32.

  The noise removing capacitor 91 is the same as the noise removing capacitor 92 provided in the above-described circuit on the outdoor unit 2 side. That is, the noise removing capacitor 91 is a noise filter provided on the indoor unit 1 side.

  The rectifier circuit 14 is a circuit that rectifies the voltage E, and is configured by, for example, a diode bridge (DB). The smoothing capacitor 15 is an element for smoothing the voltage E rectified by the rectifier circuit 14. Hereinafter, the voltage after smoothing by the smoothing capacitor 15 (that is, the voltage across the terminals of the smoothing capacitor Ec) is referred to as voltage Ec. Hereinafter, this voltage Ec is also referred to as an accumulated voltage.

  This accumulated voltage Ec is converted by the power supply circuit 20 described below, and the converted voltage is converted into each member of the indoor unit 1 (a control circuit which is a member (not shown) (a microcomputer 45 in FIG. 3 described later, not shown in FIG. 1)). .) Etc.).

  The resistors 16 and 17 are elements for dividing the voltage Ec. Here, a voltage at a node (hereinafter referred to as a node P) where the resistor 16 and the resistor 17 are connected to each other is represented by VP.

  As shown in FIG. 1, the node P is connected to the + input terminal (non-inverting input terminal) of the comparator 32. For this reason, the voltage VP is applied to the + input terminal of the comparator 32.

(Power supply circuit 20)
The power supply circuit 20 is connected to the smoothing circuit 10, and the voltage Ec is supplied as an input voltage from the smoothing circuit 10. The power supply circuit 20 is a circuit that further converts the voltage Ec and supplies the converted voltage to each member of the indoor unit 1 and the outdoor unit 2. The power supply circuit 20 includes a SW (Switching) power supply 21, a transformer 22, diodes 26 and 27, and smoothing capacitors 28 and 29.

  The transformer 22 is a transformer that converts the voltage input to the primary side (input side) winding and outputs it to the secondary side (output side) winding. The transformer 22 includes primary windings 23p and 24p and secondary windings 23s and 24s. The secondary winding 23s corresponds to the primary winding 23p, and the secondary winding 24s corresponds to the primary winding 24p. The primary winding 23p and the primary winding 24p are connected to each other via the SW power supply 21.

  In the power control apparatus 101, the ground potential (GND potential) is shared between the primary side of the transformer 22 (the primary windings 23p and 24p) and the secondary side (the secondary windings 23s and 24s). It has not been. In other words, in the circuit configuration of the power control apparatus 101, the primary side and the secondary side of the transformer 22 are not electrically connected (insulated). Hereinafter, the circuit configuration is also referred to as an insulation circuit.

  It is desirable to more reliably prevent each member on the secondary side from being damaged by high voltage due to unintentional inflow of voltage signals from the primary side (eg high voltage side) to the secondary side (eg low voltage side) In some cases, it is preferable to employ an insulating circuit.

  The SW power supply 21 is a power supply capable of converting a waveform (more specifically, frequency, amplitude, duty ratio, etc.) of a voltage input to itself. By appropriately setting the operation of the SW power supply 21 and the voltage dividing ratio of the primary windings 23p and 24p, a secondary voltage having a desired magnitude can be generated in each of the secondary windings 23s and 24s.

  Then, the voltage of the secondary winding 23 s is output to the outside of the power control device 101 via the diode 26 and the smoothing capacitor 28. The diode 26 is an element for rectifying the voltage of the secondary winding 23s. The smoothing capacitor 28 is an element for smoothing the voltage rectified by the diode 26.

  Similarly, the voltage of the secondary winding 24 s is output to the outside of the power control apparatus 101 via the diode 27 and the smoothing capacitor 29. The diode 27 is an element for rectifying the voltage of the secondary winding 24s. The smoothing capacitor 29 is an element for smoothing the voltage rectified by the diode 27.

  Here, the voltages (voltage between terminals) of the smoothing capacitor 28 and the smoothing capacitor 29 are referred to as a voltage Vc1 and a voltage Vc2, respectively. By providing the diodes 26 and 27 and the smoothing capacitors 28 and 29, the voltages Vc1 and Vc2 are almost constant voltages, respectively.

  Therefore, the power supply circuit 20 can supply each member of the indoor unit 1 with at least one of the DC voltage Vc1 or Vc2 having a predetermined magnitude. In other words, the power supply circuit 20 can distribute and supply power supplied from the outside (smoothing circuit 10, more specifically, an external power supply) to each member of the indoor unit 1.

(Power supply stop circuit 30)
The power supply stop circuit 30 is connected to the smoothing circuit 10. The power supply stop circuit 30 includes a detection capacitor 31, a comparator 32, resistors 33, 34, 36, and 38, a photocoupler 35, and a diode 37.

  As described below, the power supply stop circuit 30 supplies power from the indoor unit 1 to the outdoor unit 2 based on the result of the magnitude comparison of the voltage VP and the voltage VN (the voltages in the smoothing circuit 10). It is configured so that it can be stopped.

  The detection capacitor 31 is a capacitor in which one terminal is grounded and the other terminal is connected to the above-described node N (in other words, the negative input terminal of the comparator 32). Accordingly, the voltage VN (the above-described detection voltage) is applied to the detection capacitor 31.

  Note that the detection capacitor 31 is connected to an external power source via the smoothing circuit 10 when the plug 4 is inserted into the outlet 5, and more specifically, electric power (more specifically, electric power supplied from the external power source). It may be understood that the device stores energy or charge).

  The comparator 32 may be an operational amplifier (operational amplifier) having two inputs and one output. As described above, the voltage VP and the voltage VN are applied to the + input terminal and the −input terminal of the comparator 32, respectively.

  The output side of the comparator 32 is connected to the resistor 33. Therefore, the output voltage Vout (output signal, stop signal) of the comparator 32 is applied to the resistor 33. The resistor 33 is an element for reducing the current flowing into the primary side of the photocoupler 35 (in other words, the current flowing into the main relay signal terminal 40). The primary side of the photocoupler 35 is connected to the resistor 34 in parallel. The current flowing into the primary side of the photocoupler 35 can also be adjusted by the value of the resistor 34.

The output voltage Vout of the comparator 32 is expressed by the following equation (1), that is,
Vout = K × (VP−VN) (1)
Represented as: Here, K is the gain of the comparator 32 (op-amp). In general, K is a very large positive value.

  According to the above equation (1), Vout> 0 when VP> VN. On the other hand, when VP <VN, Vout <0. That is, the magnitudes of the voltage VP and the voltage VN can be compared according to the polarity of the output voltage Vout. That is, the comparator 32 has a function as a comparison circuit that compares the voltage VP and the voltage VN.

  The photocoupler 35 is an element that transmits an electrical signal from the primary side to the secondary side while electrically insulating the primary side and the secondary side of the power control apparatus 101. In FIG. 1, in the photocoupler 35, a DC voltage (power supply voltage) of 15V is applied to the primary side light emitting element (eg, light emitting diode), and a DC voltage of 5V is applied to the secondary side light receiving element (eg, phototransistor). The case where (power supply voltage) is supplied is illustrated.

  Specifically, the photocoupler 35 converts an electrical signal (for example, voltage) input to the primary side into an optical signal in the primary side light emitting element, and transmits the optical signal to the secondary side. Then, the photocoupler 35 reconverts the optical signal into an electric signal in the secondary light receiving element, and outputs the reconverted electric signal. When the power control apparatus 101 is configured as an insulating circuit, it is preferable to provide a photocoupler 35.

  The voltage (electric signal) output from the secondary side of the photocoupler 35 is supplied to the main relay signal terminal 40 via the diode 37 and the resistor 38. That is, the voltage output from the secondary side of the photocoupler 35 is rectified and stepped down and supplied to the main relay signal terminal 40. The secondary side of the photocoupler 35 is also connected to a resistor 36 that is a ground resistor.

  The main relay signal terminal 40 is a signal terminal of a control device (for example, a microcomputer 45 in FIG. 3 to be described later, not shown in FIG. 1) that comprehensively controls the operation of each member of the air conditioner 100. The main relay signal terminal 40 is configured to supply a relay cutoff signal to the main relay 49 via the diodes 48a and 48b when Vout <0 (in other words, when VP <VN). Yes. For this reason, when Vout <0, the main relay 49 is cut off, and the supply of electric power from the indoor unit 1 to the outdoor unit 2 is stopped.

(Specific example of operation of power control apparatus 101)
As described above, in the electric safety method, the residual voltage Vr is set to 45 V (reference voltage) or less after 1 second from the time when the user unplugs the power plug while the peak voltage is applied during operation of the electrical product. Is required to do.

  In consideration of this point, even during the operation of the air conditioner 100, the remaining voltage Vr is quickly reduced to the reference voltage (45V) or less (within 1 second) after the interruption of the power supply from the external power source to the indoor unit 1 is detected. ) It is preferable to lower.

  In consideration of the above points, in the power control apparatus 101 of the present embodiment, the power supply stop circuit 30 includes a power supply stop circuit 30 in order to quickly detect the interruption of the power supply from the external power source to the indoor unit 1 during the operation of the air conditioner 100. Is provided. More specifically, by providing the detection capacitor 31 and the comparator 32, it is possible to quickly detect the interruption of power from the external power source to the indoor unit 1 during the operation of the air conditioner 100.

  Here, the detection capacitor 31 is selected so that the capacitance is sufficiently smaller than that of the smoothing capacitor 15. For example, when the capacitance of the smoothing capacitor 15 is 100 μF, the capacitance of the detection capacitor 31 may be selected as 10 μF (1/10 of the capacitance of the smoothing capacitor 15).

  Thus, since the capacitance of the detection capacitor 31 is sufficiently smaller than the capacitance of the smoothing capacitor 15, the time constant (hereinafter referred to as “voltage VN (detection voltage) applied to the detection capacitor 31” decreases. , The second time constant) is sufficiently smaller than the time constant (hereinafter referred to as the first time constant) in which the voltage Ec (accumulated voltage) applied to the smoothing capacitor 15 decreases. As an example, when the first time constant is about 2 seconds, the second time constant can be about 0.2 seconds (about 1/10 of the first time constant).

  For this reason, for example, by measuring the transition of the output voltage Vout over time, it is possible to detect the interruption of the power supply from the external power source to the indoor unit 1. In addition, the output voltage Vout can also be used as a stop signal for stopping power supply from the indoor unit 1 to the outdoor unit 2.

  For example, the power control apparatus 101 may be configured such that a relay cutoff signal is supplied from the main relay signal terminal 40 to the main relay 49 when the voltage Vout becomes smaller than a predetermined value.

  Further, as described above, when the polarity of the voltage Vout is negative (when the detection voltage VN is larger than the voltage VP), the relay cutoff signal is supplied from the main relay signal terminal 40 to the main relay 49. The power control apparatus 101 can also be configured. Further, the voltage Vout itself may be used as a stop signal.

(Effect of air conditioner 100)
As described above, the power control apparatus 101 stops the supply of power from the indoor unit 1 to the outdoor unit 2 when detecting the interruption of power from the external power source to the indoor unit 1 during operation of the air conditioner 100. . Therefore, it is possible to prevent the residual voltage on the outdoor unit 2 side (the above-described residual voltage Vr) from being transmitted to the indoor unit 1. Therefore, since the residual voltage to be discharged in the indoor unit 1 does not increase more than necessary, the residual voltage can be quickly reduced.

  Note that the value of the voltage VP described above may be a predetermined value set in advance by the designer of the air conditioner 100 according to various laws or standards to which the air conditioner 100 should comply.

  Moreover, although the case where the operational amplifier was used as the comparator 32 was illustrated in this embodiment, the kind of the comparator 32 is not limited to this. The comparator 32 compares the magnitudes of the voltage VP and the voltage VN, and can output different output voltages Vout depending on whether (i) VP> VN or (ii) VP <VN. I just need it. This is because the output voltage Vout when VP <VN can be used as the stop signal.

[Embodiment 2]
Hereinafter, Embodiment 2 of this invention is demonstrated in detail based on FIG. For convenience of explanation, members having the same functions as those described in the above embodiment are denoted by the same reference numerals and description thereof is omitted.

(Power control device 103)
The air conditioner 100 according to the present embodiment is obtained by replacing the power control apparatus 101 according to the first embodiment with a power control apparatus 103. Hereinafter, the configuration of the power control apparatus 103 will be described with reference to FIG. FIG. 3 is a block diagram illustrating a configuration of a main part of the power control apparatus 103.

  As shown in FIG. 3, in the power control apparatus 103, the power supply stop circuit 30 in the power control apparatus 101 of the first embodiment is replaced with a power supply stop circuit 60.

  In the power control apparatus 103, the ground potential is shared between the primary side and the secondary side of the transformer 22. In other words, in the circuit configuration of the power control apparatus 103, the primary side and the secondary side of the transformer 22 are electrically connected (non-insulated). Hereinafter, this circuit configuration is also referred to as a non-insulated circuit. The power control apparatus 103 is different from the power control apparatus 101 in that it is configured as a non-insulated circuit.

  By configuring the power control device 103 as a non-insulated circuit, the photocoupler 35 can be omitted. Furthermore, the elements around the photocoupler 35 can be omitted. Thus, the configuration of the power supply stop circuit 60 can be simplified as compared with the power supply stop circuit 30 of the first embodiment.

  Specifically, the power supply stop circuit 60 includes a detection capacitor 31, a comparator 32, and a resistor 33. That is, the power supply stop circuit 60 is obtained by omitting the resistors 34, 36, and 38, the photocoupler 35, and the diode 37 from the power supply stop circuit 30.

  Also with the power control apparatus 103 of the present embodiment, the residual voltage to be discharged in the indoor unit 1 can be quickly lowered, as with the power control apparatus 101 described above. Further, as described above, the configuration of the power supply stop circuit 60 can be simplified as compared with the power supply stop circuit 30 of the first embodiment.

[Embodiment 3]
Hereinafter, Embodiment 3 of this invention is demonstrated in detail based on FIG.

(Power control device 104)
The air conditioner 100 of the present embodiment is obtained by replacing the power control device 103 of the above-described second embodiment with a power control device 104. Hereinafter, the configuration of the power control apparatus 104 will be described with reference to FIG. FIG. 4 is a block diagram illustrating a configuration of a main part of the power control device 104.

  As shown in FIG. 4, in the power control apparatus 104, the power supply stop circuit 60 in the power control apparatus 103 of the second embodiment described above is replaced with a power supply stop circuit 50.

  As shown in FIG. 4, in the power control device 104, the ground potential is shared between the primary side and the secondary side of the transformer 22, similarly to the power control device 103 described above. That is, the power control device 104 is configured as a non-insulated circuit, similarly to the power control device 103 described above. Thereby, similarly to the above-described power supply stop circuit 60, the configuration of the power supply stop circuit 50 can be simplified.

  The power supply stop circuit 50 includes a detection capacitor 31 and a microcomputer 45 (control circuit, voltage determination unit, signal generation unit). The microcomputer 45 is provided with a main relay signal terminal 40. As described above, the power supply stop circuit 50 is obtained by adding the microcomputer 45 to the power supply stop circuit 30 and omitting the comparator 32, the resistors 33, 34, 36, and 38, the photocoupler 35, and the diode 37. .

  In the power control device 104, (i) the detected voltage VN is input to the microcomputer 45 through the node N, and (ii) the voltage VP is input through the node P. Note that the detection voltage VN and the voltage VP may be input to the microcomputer 45 using an empty terminal of the microcomputer 45.

  Then, the microcomputer 45 performs a calculation for comparing the magnitudes of the detection voltage VN and the voltage VP. That is, the microcomputer 45 of this embodiment is provided with a function as a voltage determination unit similar to the above-described comparator 32 (comparison circuit).

  In order to facilitate the calculation of the magnitude comparison between the detected voltage VN and the voltage VP in the microcomputer 45, the detected voltage VN and the voltage VP may be AD (Analog-Digital) converted inside the microcomputer 45, respectively.

  Then, the microcomputer 45 generates the output voltage Vm (output signal, stop signal) based on the result of the magnitude comparison between the detected voltage VN and the voltage VP, and outputs the output voltage Vm from the main relay signal terminal 40. . That is, the microcomputer 45 is further provided with a function as a signal generation unit that generates the output voltage Vm.

  For example, the microcomputer 45 may be set so that the output voltage Vm functions as the above-described relay cutoff signal when the detected voltage VN is higher than the voltage VP. Thus, the output voltage Vm can also be used as a stop signal for stopping the power supply from the indoor unit 1 to the outdoor unit 2.

  Further, for example, if the output voltage Vm is set as an amount proportional to the difference between the detection voltage VN and the voltage VP (that is, the output voltage Vm is set in the same manner as the output voltage Vout in the above equation (1)). In other words, by measuring the transition of the output voltage Vm over time, it is possible to detect the interruption of the power supply from the external power source to the indoor unit 1.

  As described above, also by the power control apparatus 104 of the present embodiment, the residual voltage to be discharged in the indoor unit 1 can be quickly reduced, similarly to the power control apparatus 103 described above. In other words, the power supply stop circuit according to one embodiment of the present invention can be realized by using the microcomputer 45 instead of the comparator 32.

  In addition, the comparator 32 can be omitted by having the microcomputer 45 have the function of the comparison circuit. Furthermore, the element (resistor 33) around the comparator 32 can be omitted. Therefore, the configuration of the power supply stop circuit 50 can be further simplified as compared with the power supply stop circuit 60 of the second embodiment.

[Example of software implementation]
The control block (especially the microcomputer 45) of the air conditioner 100 may be realized by a logic circuit (hardware) formed in an integrated circuit (IC chip) or the like, or realized by software using a CPU (Central Processing Unit). May be.

  In the latter case, the microcomputer 45 includes a CPU that executes instructions of a program that is software that implements each function, a ROM (Read Only Memory) or a storage in which the above-described program and various data are recorded so as to be readable by the computer (or CPU). An apparatus (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like are provided. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.

[Summary]
A power control apparatus (101) according to aspect 1 of the present invention includes an indoor unit (1) to which power is supplied from an external power source, and an outdoor unit (2) to which power is supplied from the indoor unit during operation. In the air conditioner (air conditioner 100) power control apparatus, when the power supply from the power source to the indoor unit is detected during the operation of the air conditioner, the indoor unit is switched to the outdoor unit. A power supply stop circuit (30) for stopping the power supply.

  According to the above configuration, when the interruption of power from an external power source (for example, a commercial power source) to the indoor unit is detected during operation of the air conditioner, the power supply stop circuit is connected to the outdoor unit from the indoor unit. Stop supplying power. Therefore, it is possible to prevent the residual voltage on the outdoor unit side (the voltage Vr in FIG. 1 described above) from being transmitted to the indoor unit. Therefore, since the residual voltage to be discharged in the indoor unit does not increase more than necessary, there is an effect that the residual voltage can be quickly reduced.

  The power control apparatus according to aspect 2 of the present invention is the power control apparatus according to aspect 1, wherein the power supply stop circuit is connected to a power supply connection unit (smoothing circuit 10) connected to the power supply, and is supplied from the power supply. When the detection voltage (voltage VN), which is a voltage applied to the capacitor, exceeds a predetermined voltage (voltage VP) from the indoor unit, the capacitor is stored from the indoor unit. It is preferable to output a stop signal (output voltage Vout) for stopping power supply to the outdoor unit.

  According to the above configuration, power supply from the indoor unit to the outdoor unit can be performed even when the detected voltage exceeds a predetermined voltage in the state where the interruption of the power supply from the external power source to the indoor unit is detected. Can be stopped. Therefore, since the state where the residual voltage on the outdoor unit side is transmitted to the indoor unit can be quickly eliminated, the residual voltage to be discharged in the indoor unit can be lowered more quickly.

  In the power control device according to aspect 3 of the present invention, in the aspect 2, the power supply stop circuit includes a comparator (32) that compares the detection voltage with the predetermined voltage, and the detection voltage is the predetermined voltage. When the voltage is exceeded, a signal (output voltage Vout) output from the comparator may be output as the stop signal.

  According to said structure, it becomes possible to utilize the signal output from a comparator as a stop signal. That is, there is an effect that it is possible to realize a power supply stop circuit using a comparator.

  In the power control device according to aspect 4 of the present invention, in the aspect 2, the power supply stop circuit includes a voltage determination unit (microcomputer 45) that determines whether or not the detected voltage exceeds the predetermined voltage; A control circuit (microcomputer 45) including a signal generation unit (microcomputer 45) that generates the stop signal (output signal Vm) when the voltage determination unit determines that the detected voltage exceeds the predetermined voltage. ).

  According to said structure, it can replace with a comparator and can also implement | achieve a power supply stop circuit also by using a control circuit (example: microcomputer). For this reason, the comparator and its peripheral elements can be omitted from the power supply stop circuit. Therefore, there is an effect that the configuration of the power supply stop circuit can be simplified.

  A power control device according to aspect 5 of the present invention includes, in any one of the above aspects 1 to 4, a power supply circuit (20) for supplying the power to an outdoor unit, wherein the power supply circuit includes: a primary side; A transformer (22) that is insulated from the secondary side may be provided.

  According to said structure, there exists an effect that it becomes possible to supply electric power from the said primary side to a secondary side, making the primary side and secondary side of a power supply circuit into an insulated state. In addition, since the secondary side (example: low voltage side) is insulated from the primary side (example: high voltage side), each member (electrical component) on the secondary side is more reliably prevented from being damaged by high voltage. be able to.

  A power control device according to aspect 6 of the present invention includes, in any one of the above aspects 1 to 4, a power supply circuit for supplying the power to an outdoor unit, wherein the power supply circuit includes a primary side and a secondary side. And a transformer in a non-insulated state.

  According to said structure, there exists an effect that it becomes possible to supply electric power from the said primary side to the secondary side, making the primary side and secondary side of a power supply circuit into a non-insulated state. When the primary side and the secondary side of the power supply circuit are in a non-insulated state, even when the power supply stop circuit is realized using a comparator, the photocoupler and its peripheral elements are connected in the power supply stop circuit. Can be omitted. This simplifies the configuration of the power supply stop circuit.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.

DESCRIPTION OF SYMBOLS 1 Indoor unit 2 Outdoor unit 10 Smoothing circuit (power supply connection part)
20 Power supply circuit 22 Transformer 30, 50, 60 Power supply stop circuit 31 Capacitor for detection (capacitor)
32 comparator 45 microcomputer (control circuit, voltage determination unit, signal generation unit)
100 Air conditioner (air conditioner)
101, 103, 104 Power control device VP voltage (predetermined voltage)
VN voltage, detection voltage Vr voltage, residual voltage Vout output voltage (stop signal)
Vm Output voltage (stop signal)

Claims (6)

An air conditioner power control apparatus comprising an indoor unit to which power is supplied from an external power source and an outdoor unit to which power is supplied from the indoor unit during operation,
A power supply stop circuit for stopping power supply from the indoor unit to the outdoor unit when the power supply from the power source to the indoor unit is detected during operation of the air conditioner; Power control device. The power supply stop circuit is
Including a capacitor connected to a power supply connecting part connected to the power supply, and storing power supplied from the power supply;
The stop signal for stopping power supply from the indoor unit to the outdoor unit is output when a detection voltage, which is a voltage applied to the capacitor, exceeds a predetermined voltage set in advance. The power control apparatus according to 1. The power supply stop circuit is
Comparing the detected voltage with the predetermined voltage,
The power control apparatus according to claim 2, wherein when the detected voltage exceeds the predetermined voltage, a signal output from the comparator is output as the stop signal. The power supply stop circuit is
A voltage determination unit that determines whether or not the detected voltage exceeds the predetermined voltage;
3. A control circuit comprising: a signal generation unit that generates the stop signal when the voltage determination unit determines that the detected voltage exceeds the predetermined voltage. The power control device described in 1. A power circuit for supplying the power to the outdoor unit;
The power supply circuit
The power control device according to any one of claims 1 to 4, further comprising a transformer in which the primary side and the secondary side are in an insulated state. A power circuit for supplying the power to the outdoor unit;
The power supply circuit
The power control apparatus according to claim 1, further comprising a transformer in which the primary side and the secondary side are in a non-insulated state.

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