JP2011199943A - Dc control apparatus, and dc-adapted device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakage of a control circuit or a peripheral circuit in a DC-adapted device, even if the input polarity of DC power is erroneously connected to the circuit.SOLUTION: A DC control apparatus installed at an arbitrary device which operates by the DC power includes a wiring cord which is connected as a conveyance passage of the DC power, the control circuit which controls the device by the DC power conveyed via the wiring cord, and a polarity inversion part which is arranged between the terminal end of the wiring cord and the control circuit. The polarity inversion part includes an electric passage which is formed between lines for conveying the DC power to the control circuit and carries electricity when the polarity of the DC power is reversely connected thereto, a switch which replaces a conveyance contact point of the DC power by the current-carrying of the electric passage, and a polarity matching part which controls the operation of the switch. At electricity carrying of the electric passage, by replacing the conveyance contact point of the switch by the polarity matching part, the inverted polarity of the polarity of the DC power at the terminal end of the wiring cord is set as the polarity of the control circuit.

Description

  The present invention relates to a DC control device that supplies DC power having the same polarity as a DC power supply, and a DC-compatible device including the DC control device.

  Many conventional home appliances include a control circuit that operates by inputting a commercial power source that is AC power. However, in recent years, home electric appliances (hereinafter referred to as “hereinafter referred to as“ DC power ”) that operate using DC power obtained by rectifying and smoothing AC power or DC power obtained by a fuel cell, a solar power generation device, or the like as a driving source. The number of DC-compatible devices is increasing. In the future, from the viewpoint of promoting energy saving, it is considered that a DC power distribution system for stably supplying DC power to such DC-compatible devices in homes and the like will become widespread.

  In such a DC power distribution system, a DC outlet provided at the end of a transfer path of DC power supplied by a DC power supply has a positive connection port corresponding to a positive power feeding part of the DC power supply, and a DC power supply A negative electrode connection port corresponding to the negative electrode feeding portion is provided. Unlike the connection of home appliances that operate using conventional AC power as the drive source, the DC power supply in the DC distribution system has positive and negative polarities, so when connecting a DC-compatible device to a DC outlet via a wiring cord, There is a problem that the positive connection port and the negative connection port must not be reversely connected. When the positive connection port and the negative connection port are reversely connected, the DC-compatible device does not operate or fails. For example, Patent Document 1 discloses an outlet plug having a shape in which positive and negative polarities cannot be reversely connected.

  Patent Document 1 discloses an outlet adapter that can be attached to a DC outlet having a shape in which the connection polarity cannot be reversed and can reverse the polarity of the input power supply of the DC device.

JP 2009-158110 A

  According to the shape of the outlet plug disclosed in Patent Document 1 as described above, positive and negative polarities can be prevented from being reversely connected. However, enormous costs and facilities are required to spread such outlet plugs so that they can be applied to all devices. Also, the wiring cord between the outlet plug and the DC-compatible device may be modified by extension or shortening by a third party, or specialized in, for example, installation work between an air conditioner indoor unit and an outdoor unit. There are also cases where positive and negative polarities are reversely connected by a trader or the like. In such a case, even if the outlet plug is connected to the DC outlet so as to have the same polarity as that of the DC power supply, DC power having the reverse polarity of the DC power supply is supplied to the DC-compatible device. There was a point.

  The present invention solves the above-mentioned conventional problems, and is the same as the polarity of the DC power source without taking any special measures regardless of the input polarity of the DC power supplied via the connected wiring cord. An object of the present invention is to provide a DC control device that supplies DC power having polarity to prevent destruction of a control circuit or a peripheral circuit, and a DC-compatible device including the DC control device.

  In order to solve the conventional problem, a DC control device of the present invention is a DC control device provided in an arbitrary device that operates by DC power, and a wiring cord connected to a distribution path of the DC power, A control circuit that controls the device by the DC power supplied through the wiring cord; and a polarity reversing unit provided between a termination of the wiring cord and the control circuit, the polarity reversing unit Is provided between the lines for conveying the DC power to the control circuit, and an electric path that is energized when the polarity of the DC power is reversely connected, and a supply contact for the DC power by energization of the electric path. A switch unit for switching, and a polarity matching unit for controlling the operation of the switch unit, and when the electrical path is energized, the supply contact of the switch unit by the polarity matching unit Instead, the is characterized in that the polarity obtained by inverting the polarity of the DC power at the end of the wire cord to the polarity of the control circuit.

  Thereby, regardless of the input polarity of the DC power supplied via the connected wiring cord, the DC power having the same polarity as that of the DC power supply can be supplied to prevent the control circuit or the peripheral circuit from being destroyed. .

  According to the in-house power distribution system according to the present invention, the control circuit or the peripheral circuit is supplied by supplying DC power having the same polarity as that of the DC power supply regardless of the input polarity of the DC power supplied through the connected wiring cord. Circuit destruction can be prevented.

Explanatory drawing which showed a mode that the DC corresponding | compatible apparatus provided with the DC control apparatus in Embodiment 1 was connected to a DC outlet. Explanatory drawing which showed the structure of the polarity inversion part of the direct current | flow control apparatus in Embodiment 1. Explanatory drawing which shows the relationship between the electric current by electricity supply of the electrical pathway in Embodiment 1, and the conveyance contact made conductive. Explanatory drawing explaining operation | movement of the polarity inversion part when the DC power which has the same polarity as DC power supply is conveyed by the termination | terminus of the wiring cord in Embodiment 1 Explanatory drawing explaining operation | movement of the polarity inversion part when the direct-current power which has a polarity opposite to direct-current power supply is conveyed to the termination | terminus of the wiring cord in Embodiment 1 Explanatory drawing which shows an example which provided the DC control apparatus in Embodiment 1 in the indoor unit and outdoor unit of an air-conditioner Explanatory drawing which showed the structure of the DC control apparatus in Embodiment 2. Explanatory drawing which shows a mode before the opening / closing switch part in Embodiment 2 is opened. Explanatory drawing which shows a mode after the opening / closing switch part in Embodiment 2 is open | released Explanatory drawing which showed the structure of the polarity inversion part of the DC control apparatus in Embodiment 3. Explanatory drawing which shows the relationship between the electric current by electricity supply of the electrical pathway in Embodiment 3, and the conveyance contact made conductive. Explanatory drawing explaining operation | movement of the polarity inversion part when the DC power which has the same polarity as a DC power supply is conveyed to the termination | terminus of the wiring cord in Embodiment 3 Explanatory drawing explaining operation | movement of the polarity inversion part when the direct-current power which has a polarity opposite to direct-current power supply is conveyed to the termination | terminus of the wiring cord in Embodiment 3 Explanatory drawing which showed the structure of the direct current | flow control apparatus in Embodiment 4. Explanatory drawing which shows a mode before the opening / closing switch part in Embodiment 4 is opened. Explanatory drawing which shows a mode after the opening / closing switch part in Embodiment 4 is open | released Explanatory drawing explaining operation | movement of the polarity inversion part when the DC power which has the same polarity as DC power supply is conveyed by the termination | terminus of the wiring cord in Embodiment 4 Explanatory drawing which shows a mode before the opening / closing switch part in Embodiment 4 is opened. Explanatory drawing which shows a mode after the opening / closing switch part in Embodiment 4 is open | released

  A first aspect of the present invention is a DC control device provided in an arbitrary device that operates with DC power, the wiring cord being connected as a DC power transfer route, and the DC power transferred via the wiring cord. A control circuit for controlling the operation, and a polarity reversing unit provided between the end of the wiring cord and the control circuit. The polarity reversing unit is provided between the lines carrying DC power to the control circuit and An electrical path that is energized when the polarity of the DC power is reversely connected, a switch unit that switches the DC power carrying contact by energization of the electrical path, and a polarity matching unit that controls the operation of the switch unit. When the path is energized, the polarity of the DC power at the end of the wiring cord is reversed by switching the conveyance contact of the switch unit by the polarity matching unit.

  As a result, DC power having the same polarity as that of the DC power supply can be supplied to the control circuit regardless of the input polarity of the DC power supplied via the connected wiring cord, which is opposite to the polarity of the DC power supply. Even when the DC power having the polarity is conveyed via the wiring cord, the control circuit or the peripheral circuit can be prevented from being destroyed.

  In the second invention, the polarity reversing unit of the first invention in particular reverses the polarity of the DC power at the end of the wiring cord when the electrical path is cut off.

  As a result, when the input polarity of the DC power at the end of the wiring cord is the same polarity as the polarity of the DC power supply, the input polarity of the DC power for supplying the same polarity as the input polarity to the control circuit is set. When the polarity is opposite to the polarity, the polarity obtained by inverting the input polarity is set as the polarity of the control circuit, so that the control circuit or the peripheral circuit in the DC-compatible device can be prevented from being destroyed.

  In the third invention, in particular, the electric path of the first or second invention has a resistance for adjusting a current passed through the electric path.

  Thereby, the current required for the polarity matching unit of the polarity inverting unit to control the switch unit can be appropriately set.

  According to a fourth aspect of the invention, in particular, the polarity inversion unit of any one of the first to third aspects includes an open / close switch unit that opens the electrical path, and the control circuit controls to open the open / close switch unit. An open / close determination unit that outputs a signal, and an open / close control unit that controls the open / close switch unit to open in accordance with a control signal output by the open / close determination unit, and is supplied with DC power via the polarity reversing unit. The open / close determining unit controls the open / close control unit to open the open / close switch unit.

  Thereby, after the DC power having the same polarity as that of the DC power supply is supplied to the control circuit, it is possible to reduce the power consumption by the polarity reversing unit by opening the electrical path so that no current flows through the electrical path. . Furthermore, since the polarity matching unit and the switch unit of the polarity reversing unit constitute a latching relay, the conduction state of the transport contact of the switch unit of the polarity reversing unit is fixed and maintained even after the electrical path is opened. can do.

  In the fifth invention, in particular, the polarity determination unit and the control circuit of any one of the first to fourth inventions are provided on the same printed circuit board.

  This prevents destruction of the DC-compatible device due to reverse connection of the wiring cord during the manufacture of a DC-compatible device that operates using DC power provided with DC control equipment as a drive source, or during construction such as installation of the device. Can do.

  The sixth aspect of the invention includes the DC control device according to any one of the first to fifth aspects of the invention.

  Thereby, regardless of the input polarity of the DC power supplied via the connected wiring cord, the DC power having the same polarity as that of the DC power supply can be supplied to prevent the control circuit or the peripheral circuit from being destroyed. . Therefore, even if a DC-compatible device is connected with the polarity of the DC outlet reversed, or even if the wiring cord is incorrectly connected by a third party such as modification of the wiring cord or a specialist, the DC-compatible device is suitable. Can work.

  The present invention can attain the object of the present invention by making the main parts of the first to sixth inventions into embodiments, so the details of the embodiments corresponding to each claim will be described below with reference to the drawings. The description will be given with reference to the best mode for carrying out the present invention. Note that the present invention is not limited to the present embodiment. Further, in the description of each embodiment, the same configuration and the same function and effect are given the same reference numerals, and redundant description will not be given.

(Embodiment 1)
FIG. 1 is an explanatory diagram showing a state in which a DC-compatible device 100 provided with a DC control device 10 according to Embodiment 1 of the present invention is connected to a DC outlet 11. As shown in FIG. 1, the DC-compatible device 100 according to the first embodiment includes a positive electrode and a negative electrode via a DC power transfer path 13 wired from a DC power supply 40 installed in a distribution board of a house or the like. The DC power supplied by the insertion connection to the DC outlet 11 having a pair of power feeding units is operated as a drive source. The DC control device 10 of the first embodiment is provided in such a DC-compatible device 100. In the following description, the DC outlet 11 is assumed to be installed on the wall as shown in FIG. 1, and the vertical and horizontal directions when the DC outlet 11 is viewed from the front (front) will be described as the vertical and horizontal directions in each embodiment. .

  The DC outlet 11 shown in FIG. 1 is a DC power obtained by rectifying and smoothing an AC power source such as a commercial power source by an AC / DC converter disposed in a distribution board installed in a specific place such as a house. Alternatively, DC power supplied by a DC power source 40 connected to a fuel cell or a solar power generator installed in the house or the like is conveyed.

  In FIG. 1, a DC outlet 11 has a connection port 12a which is a positive power feeding part of DC power and a connection port 12b which is a negative power feeding part on the front side. Each of the connection ports 12a and 12b is opened to the front of the DC outlet 11, and the blade receptacles connected to the positive electrode and the negative electrode of the DC power supply 40 provided in the distribution board via the DC power transfer path 13. A spring is provided inside. The plug socket blades 1a and 1b of the DC control device 10 inserted into the connection ports 12a and 12b are installed in the distribution board by being received by blade receiving springs provided at the connection ports 12a and 12b. The DC power supply 40 is electrically connected.

  In FIG. 1, the DC control device 10 of the first embodiment includes a plug 2 having outlet plug blades 1 a and 1 b, a wiring cord 3, and a printed board 4.

  The plug 2 electrically connects the outlet connection blades 1a, 1b and the starting end 3a of the wiring cord 3, and when the outlet connection blades 1a, 1b are inserted and connected to the connection ports 12a, 12b, respectively. The DC power is conveyed to the printed circuit board 4 through the wiring cord 3.

  Each of the outlet connection plug blades 1 a and 1 b is made of a metal material and is formed in a substantially rectangular parallelepiped shape with respect to a direction orthogonal to the back side of the plug 2. The shape of the outlet connection plug blades 1a and 1b is not limited to a substantially rectangular parallelepiped shape as long as it substantially matches the shape of the connection ports 12a and 12b. In the following description, it is assumed that the outlet connection plug blade 1a is inserted and connected in correspondence with the connection port 12a, which is a positive power feeding portion of DC power, and the outlet connection plug blade 1b is inserted and connected in correspondence with the connection port 12b.

  The wiring cord 3 is a copper wire having a predetermined length covered with an insulating material, and functions as a transport path for DC power transported through the DC outlet 11. The starting end 3 a of the wiring cord 3 is electrically connected to the front side of the plug 2, and the terminal end 3 b of the wiring cord 3 is connected to the input terminals T 1 and T 2 of the polarity reversing unit 5 of the printed board 4. The printed circuit board 4 is wired so that the polarity inversion unit 5 and the control circuit 6 are connected in series.

  Details of the configuration of the polarity reversing unit 5 will be described with reference to FIG. FIG. 2 is an explanatory diagram showing the configuration of the polarity reversing unit 5 of the DC control device 10 according to the first embodiment.

  When DC power having the same polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2 connected to the terminal 3b of the wiring cord 3 shown in FIG. The control circuit 6 is supplied with DC power having a non-inverted polarity, that is, the same polarity as the input polarity. In addition, the polarity reversing unit 5 receives DC power having an input polarity opposite to that of the DC power supply 40 to the input terminals T1 and T2 connected to the terminal 3b of the wiring cord 3 shown in FIG. , DC power having a polarity obtained by inverting the input polarity is supplied to the control circuit 6. Hereinafter, the case where DC power having an input polarity that is the same polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2 indicates a case where the polarity of the positive electrode and the negative electrode is generated in the input terminals T1 and T2, respectively. . The case where DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 refers to a case where positive and negative polarities are generated at the input terminals T1 and T2, respectively.

  In the control circuit 6, direct current power having the same polarity as the direct current power source 40 is conveyed to the input terminals T 7 and T 8 connected to the output terminals T 5 and T 6 of the polarity reversing unit 5 via the polarity reversing unit 5. In this case, the direct-current power thus transported operates as a drive source, and the overall operation of the DC-compatible device 100 according to the first embodiment is controlled.

  As shown in FIG. 2, the polarity reversing unit 5 includes a first switch unit SW1, a second switch unit SW2, and an electrical path 5b that is a wiring between the terminals T3 and T4. The electrical path 5b is provided with a resistor R, a diode D, and a polarity matching portion 5a. In the polarity reversing unit 5, the first switch unit SW1, the second switch unit SW2, and the polarity matching unit 5a constitute a relay Ry.

  Further, as shown in FIG. 2, the electric path 5 b is provided between the lines that convey the DC power conveyed through the wiring cord 3 to the control circuit 6, and is connected to the input terminals T <b> 1 and T <b> 2 in the polarity inversion unit 5. When DC power having an input polarity that is the same polarity as the power supply 40 is conveyed, the energization is cut off, and when DC power having an input polarity that is the opposite polarity to the DC power supply 40 is conveyed, it is energized.

  The first switch unit SW1 switches the DC power carrying contact so as to conduct between the carrying contacts J1-J2 or between the carrying contacts J1-J3 according to the presence or absence of the current I by energization of the electric path 5b. The first switch unit SW1 conducts between the transport contacts J1-J2 when the electrical path 5b is not energized, that is, when the current I does not flow through the polarity matching unit 5a. In the first switch unit SW1, when the electrical path 5b is energized, that is, when the current I flows through the polarity matching unit 5a, the polarity matching unit 5a replaces the conveyance contact, and the conveyance contact J1-J3 is connected. Conduct.

  The second switch unit SW2 switches the DC power carrying contacts so as to conduct between the carrying contacts J4-J5 or the carrying contacts J4-J6 according to the presence or absence of the current I by energization of the electric path 5b. The second switch unit SW2 conducts between the transport contacts J4-J5 when the electrical path 5b is not energized, that is, when the current I does not flow through the polarity matching unit 5a. When the electrical path 5b is not energized, that is, when the current I flows through the polarity matching unit 5a, the second switch unit SW2 conducts the conveyance contact J4-J6 by switching the conveyance contact by the polarity matching unit 5a. To do.

  The resistor R is provided in the electric path 5b so as to be connected in series with the diode D and the polarity matching unit 5a. The resistor R is provided for setting the current I flowing through the polarity matching unit 5a. For example, when the current I flowing through the polarity matching unit 5a is extremely small, the first switch unit SW1 and the second switch unit SW2 do not operate. Furthermore, when the current I flowing through the polarity matching unit 5a is extremely large, the power consumption at the resistor R is large, so that the DC-compatible device 100 provided with the DC control device 10 is very inefficient. For this reason, it is preferable that the resistance R is provided in the electrical path 5b.

  The resistor R may be a fixed resistor or a variable resistor. Further, a constant current circuit for outputting a constant DC current I within the rating is provided separately from the polarity inversion unit 5, and the DC current I output by the constant current circuit is input to the electric path 5 b of the polarity inversion unit 5. In this case, the resistor R may be unnecessary. Further, when the voltage applied to both ends of the polarity matching unit 5a is small and a current determined by the inductive reactance of the polarity matching unit 5a flows, the resistor R may be unnecessary.

  The diode D has an anode side connected to the polarity matching unit 5a and a cathode side connected to the terminal T3. For this reason, when DC power having the same polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2, the electric path 5b is cut off by the diode D. Therefore, the electric path 5b is energized by the diode D only when DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2.

  The polarity matching unit 5a is composed of a coil or the like, and exchanges the transport contacts of the first switch unit SW1 and the second switch unit SW2 in accordance with the presence / absence of the current I generated by energization of the electrical path 5b. The relationship between the current I generated by energization of the electric path 5b and the transport contact that is conducted will be described with reference to FIG. FIG. 3 is an explanatory diagram showing the relationship between the current I generated by energization of the electrical path 5b and the transport contact that is conducted.

  As shown in FIG. 3, when DC power having the same polarity as that of the DC power supply 40 is conveyed to the input terminals T1 and T2 connected to the terminal 3b of the wiring cord 3, the input terminals T1 and T2 Are the positive and negative polarities, respectively. In this case, since the electric path 5b is cut off by the diode D and the current I does not flow through the polarity matching unit 5a, the first switch unit SW1 conducts between the transport contacts J1-J2, and the second switch unit SW2 Conducts between the contact points J4-J5.

  When DC power having an input polarity opposite to that of the DC power source 40 is conveyed to the input terminals T1 and T2 connected to the terminal 3b of the wiring cord 3, the input polarities of the input terminals T1 and T2 are negative. And a positive electrode. In this case, since the electrical path 5b is energized by the diode D and the current I flows through the polarity matching unit 5a, the first switch unit SW1 conducts between the transport contacts J1-J3, and the second switch unit SW2 functions as the transport contact. Conduction between J4 and J6.

  Next, the operation of the polarity reversing unit 5 when DC power having the same input polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2 will be described with reference to FIG. FIG. 4 is an explanatory diagram for explaining the operation of the polarity reversing unit 5 when DC power having the same polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2.

  When DC power having the same input polarity as that of the DC power supply 40 is conveyed to the input terminals T1 and T2 of the polarity inverting unit 5, the polarity inverting unit at the terminal end 3b of the wiring cord 3 as shown in FIG. The input polarities of the five input terminals T1 and T2 are a positive electrode and a negative electrode, respectively. In this case, since the electric path 5b is cut off by the diode D and the current I does not flow through the polarity matching unit 5a, the first switch unit SW1 conducts between the transport contacts J1-J2, and the second switch unit SW2 Conducts between the contact points J4-J5.

  The DC power transferred to the input terminals T1 and T2 is transferred to the input terminals T1 and T2 through the transfer contacts J1-J2 of the first switch unit SW1 and the transfer contacts J4-J5 of the second switch unit SW2. The input polarity of power is not inverted and is conveyed to the output terminals T1 and T2. Accordingly, since the output polarity of the DC power conveyed to the output terminals T1 and T2 has the same polarity as the input polarity of the DC power conveyed to the input terminals T1 and T2, the input terminals T7 and T8 of the control circuit 6 include DC power having the same polarity as the DC power supply 40 is carried.

  Next, the operation of the polarity reversing unit 5 when DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 will be described with reference to FIG. FIG. 5 is an explanatory diagram for explaining the operation of the polarity reversing unit 5 when DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2.

  When DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 of the polarity inverting unit 5, the polarity inversion at the terminal end 3b of the wiring cord 3 is performed as shown in FIG. The input polarities of the input terminals T1 and T2 of the unit 5 are a negative electrode and a positive electrode, respectively. In this case, since the electric path 5b is energized by the diode D and the current I flows through the polarity matching unit 5a, the first switch unit SW1 conducts between the transport contacts J1-J3, and the second switch unit SW2 Conduction is conducted between the transport contacts J4-J6.

  The DC power transferred to the input terminals T1 and T2 is transferred to the input terminals T1 and T2 through the transfer contacts J1-J3 of the first switch unit SW1 and the transfer contacts J4-J6 of the second switch unit SW2. The input polarity of power is inverted and conveyed to the output terminals T1 and T2. Accordingly, since the output polarity of the DC power conveyed to the output terminals T1 and T2 is opposite to the input polarity of the DC power conveyed to the input terminals T1 and T2, the input terminals T7 and T8 of the control circuit 6 are input to DC power having a polarity opposite to the input polarity of the DC power transferred to the terminals T1 and T2, that is, DC power having the same polarity as the polarity of the DC power supply 40 is transferred.

  FIG. 6 is an explanatory diagram illustrating an example in which the DC control device 10 according to Embodiment 1 is provided in each of the indoor unit 20 and the outdoor unit 30 of the air conditioner. In FIG. 6, both the indoor unit 20 and the outdoor unit 30 of the air conditioner are DC-compatible devices 100. As shown in FIG. 6, between the wiring cord 3A of the DC control device 10A disposed in the indoor unit 20 and the control circuit 6A wired on the printed board 4A, the polarity reversing unit 5A is placed on the printed board 4A. Are inserted and wired. Similarly, between the wiring cord 3B of the DC control device 10B disposed in the outdoor unit 30 and the control circuit 6B wired on the printed circuit board 4B, the polarity reversing unit 5B is inserted on the printed circuit board 4B. Wired.

  In FIG. 6, the plug 2 having the outlet connection plug blades 1 a and 1 b is inserted and connected to the connection ports 12 a and 12 b of the DC outlet 11, respectively. When the DC power having the input polarity is conveyed, the DC power having the same polarity as that of the DC power supply 40 is supplied to the control circuit 6A by the polarity inversion unit 5A. For this reason, the output terminal of the control circuit 6A to which the control circuit 6A and the starting end 3Ba of the wiring cord 3B are connected is connected to the DC power having the same polarity as the DC power input polarity at the terminal end 3Ab of the wiring cord 3A, that is, the DC DC power having the same polarity as that of the power supply 40 is carried.

  If the wiring cord 3A is modified by a third party or the like, or because the wiring cord 3A is reversely connected by a specialist or the like in the installation work of the air conditioner, the polarity of the DC power supply 40 is reversed to the terminal 3Ab of the wiring cord 3A. Suppose that DC power having the following polarity is conveyed. In this case, DC power having the polarity inverted by the polarity inverting unit 5A is carried to the input terminal of the control circuit 6A. As a result, the polarity reversing unit 5A of the DC control device 10A transfers DC power having the same polarity as that of the DC power supply 40 to the control circuit 6A regardless of the input polarity of the DC power transferred via the wiring cord 3A. Therefore, even when DC power having a polarity opposite to that of the DC power supply is conveyed through the wiring cord 3A, it is possible to prevent the control circuit 6A or the peripheral circuits in the indoor unit 20 from being destroyed.

  Next, when the polarity of the DC power conveyed from the output terminal of the control circuit 6A of the indoor unit 20 to the terminal 3Bb of the wiring cord 3B is the same as the polarity of the DC power source 40, the polarity reversing unit 5B DC power having the same polarity as the 40 polarity is supplied to the control circuit 6B.

  If the wiring cord 3B is modified by a third party or the like, or because the wiring cord 3B is reversely connected by a specialist or the like in the installation work of the air conditioner, the polarity of the DC power supply 40 is reversed to the terminal 3Bb of the wiring cord 3B Suppose that DC power having the following polarity is conveyed. In this case, DC power having the polarity inverted by the polarity inverting unit 5B is carried to the input terminal of the control circuit 6B. As a result, the polarity reversing unit 5B of the DC control device 10B conveys DC power having the same polarity as that of the DC power supply 40 to the control circuit 6B regardless of the input polarity of the DC power conveyed via the wiring cord 3B. Therefore, even when DC power having a polarity opposite to that of the DC power supply is conveyed through the wiring cord 3B, the control circuit 6B or the peripheral circuit in the outdoor unit 30 can be prevented from being destroyed.

  As described above, in the first embodiment, when DC power having the same polarity as that of the DC power supply 40 is conveyed to the input terminals T1 and T2 connected to the terminal 3b of the wiring cord 3, the polarity is The reversing unit 5 conveys the DC power to the control circuit 6 without reversing the polarity of the DC power conveyed when the electrical path 5b is de-energized. That is, the polarity reversing unit 5 supplies the control circuit 6 with DC power having the same polarity as that of the DC power supply 40 without inverting the input polarity of the DC power transferred to the input terminals T1 and T2. When DC power having a polarity opposite to the polarity of the DC power supply is conveyed to the input terminals T1 and T2 connected to the terminal end 3b of the wiring cord 3, the polarity reversing unit 5 is energized in the electrical path 5b. The polarity of the conveyed DC power is inverted and DC power having the inverted polarity is supplied to the control circuit 6. That is, the polarity inversion unit 5 supplies the control circuit 6 with DC power having the same polarity as that of the DC power supply 40 by inverting the input polarity of the DC power conveyed to the input terminals T1 and T2.

  Therefore, the DC control device 10 according to the first embodiment has the same polarity as the polarity of the DC power source 40 without taking any special measures regardless of the input polarity of the DC power conveyed via the wiring cord 3. Since direct-current power can be conveyed to the control device 6, even when direct-current power having a polarity opposite to the polarity of the direct-current power supply is conveyed through the wiring cord 3, the control circuit 6 or the peripheral circuit of the control circuit 6 Destruction can be prevented. Further, the DC control device 10 according to the first embodiment avoids complication of the control circuit 6 and is simple by configuring the polarity reversing unit 5 that is a circuit for polarity reversal independently of the control circuit 6. The DC power having the same polarity as the DC power supply 40 can be supplied to the control circuit 6 with a simple circuit structure.

(Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to the drawings. In the first embodiment, if the electric path 5b continues to be energized, the power consumption by the electric path 5b gradually increases, so it may not be preferable to continue the energization. Therefore, in the second embodiment, as shown in FIG. 7, an open / close switch unit 15c for opening the electrical path 15b is additionally provided in the electrical path 15b of the polarity reversing unit 15, and the control circuit 16 is connected to the direct current. When DC power having the same polarity as that of the power supply 40 is supplied, the control circuit 16 performs control so as to open the open / close switch unit 15c. At this time, the polarity reversing unit 15 needs to continue to supply the control circuit 16 with DC power having the same polarity as that of the DC power supply 40. Hereinafter, the second embodiment will be described in detail.

  As shown in FIG. 7, the polarity reversing unit 15 includes a first switch unit SW1, a second switch unit SW2, and an electrical path 15b that is a wiring between the terminals T3 and T4. The electrical path 15b is provided with a resistor R, a diode D, a polarity matching unit 5a, and an open / close switch unit 15c. In the polarity reversing unit 15, the first switch unit SW1, the second switch unit SW2, and the polarity matching unit 15a constitute a latching relay LRy. The open / close switch unit 15c and the open / close control unit 16f of the control circuit 16 constitute a relay Ry.

  Since the first switch unit SW1, the second switch unit SW2, the resistor R, the diode D, and the polarity matching unit 15a are the same as those in the first embodiment, the first switch unit SW1, the second switch unit SW2, the resistor R, A description of the diode D and the polarity matching unit 15a is omitted.

  The open / close switch unit 15c opens the electrical path 15b based on a control signal for opening the electrical path 15b output by the open / close control unit 16f of the control circuit 16, that is, disconnects the contacts J7 to J8. As described above, the latching relay LRy is configured by the polarity reversing unit 15, the first switch unit SW1, and the second switch unit SW2. For this reason, even when the opening / closing switch unit 15c opens the electrical path 15b, the first switch unit SW1 maintains the continuity between the transport contacts J1-J3 regardless of the presence or absence of the current I due to the energization of the electrical path 15b. The second switch unit SW2 keeps the conduction between the transport contacts J4-J6 fixed. Further, the open / close switch unit 15c may conduct the contacts J7-J8 based on a control signal for closing the electrical path 15b output by the open / close control unit 16f of the control circuit 16.

  The control circuit 16 includes at least a power supply circuit 16a, a DC / DC converter 16b, a controller 16c, and an open / close control unit 16f. The controller 16c includes a storage unit 16d and an open / close determination unit 16e.

  The power supply circuit 16 a is supplied with DC power having the same polarity as the DC power supply 40 supplied to the control circuit 16, and supplies necessary power to each part in the control circuit 16.

  The DC / DC converter 16b generates DC power necessary for driving the controller 16c from the DC power supplied by the power supply circuit 16a, and supplies the generated DC power to the controller 16c.

  The storage unit 16d of the controller 16c stores a state flag indicating an open state or a closed state of the electric path 15b of the polarity reversing unit 15, that is, a non-conduction state or a conduction state of the contacts J7 to J8 of the open / close switch unit 15c. Yes. For example, when the electrical path 15b of the polarity reversing unit 15 is closed, that is, when the contacts J7-J8 of the open / close switch unit 15c are conductive, the storage unit 16d has a state flag indicating the closed state. “1” is stored. When the electrical path 15b of the polarity reversing unit 15 is open, that is, when the contacts J7-J8 of the open / close switch unit 15c are non-conductive, the storage unit 16d has a state flag “ “0” is stored.

  The open / close determination unit 16e of the controller 16c refers to the state flag stored in the storage unit 16d to determine whether the open / close switch unit 15c of the polarity reversing unit 15 needs to be opened or closed. The open / close determination unit 16e of the controller 16c causes the open / close control unit 16f to open the open / close switch unit 15c when DC power having the same polarity as the DC power supply 40 is conveyed to the input terminals T7 and T8 of the control circuit 16. The open / close control unit 16f is controlled.

  The open / close control unit 16f opens the open / close switch unit 15c when DC power having the same polarity as the DC power supply 40 is supplied to the input terminals T7 and T8 of the control circuit 16 under the control of the open / close determination unit 16e. Control signal is output to the open / close switch 15c.

  Next, with reference to FIGS. 8 and 9, the operation of the polarity inverting unit 15 and the control circuit 16 when DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2. explain. FIG. 8 is an explanatory diagram showing a state before the opening / closing switch 15c is opened. FIG. 9 is an explanatory diagram showing a state after the opening / closing switch portion 15c is opened. In addition, it is assumed that the open / close switch unit 15c is closed in advance, that is, the conductive state between the contacts J7 and J8. The following description can also be applied to the case where DC power having an input polarity that is the same polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2.

  When DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 of the polarity inverting unit 15, the polarity inversion at the terminal end 3b of the wiring cord 3 is performed as shown in FIG. Input polarities of the input terminals T1 and T2 of the unit 15 are a negative electrode and a positive electrode, respectively. In this case, since the electric path 15b is energized by the diode D and the current I flows through the polarity matching unit 15a via the contacts J7-J8, the first switch unit SW1 conducts between the transport contacts J1-J3. The second switch part SW2 conducts between the transport contacts J4-J6.

  The DC power transferred to the input terminals T1 and T2 is transferred to the input terminals T1 and T2 through the transfer contacts J1-J3 of the first switch unit SW1 and the transfer contacts J4-J6 of the second switch unit SW2. The input polarity of power is inverted and conveyed to output terminals T5 and T6. Accordingly, since the output polarity of the DC power conveyed to the output terminals T5 and T6 is opposite to the input polarity of the DC power conveyed to the input terminals T1 and T2, the polarity of the input terminals T7 and T8 of the control circuit 16 is DC power having a polarity opposite to the input polarity of the DC power transferred to the input terminals T1 and T2 of the inverting unit 15, that is, DC power having the same polarity as that of the DC power supply 40 is transferred.

  When DC power having the same polarity as that of the DC power supply 40 is transferred to the input terminals T7 and T8 of the control circuit 16, the open / close determination unit 16e of the controller 16c has a state flag “1” stored in the storage unit 16d. , The opening / closing controller 16f controls the opening / closing controller 16f to open the opening / closing switch 15c. The open / close control unit 16f outputs a control signal for opening the open / close switch unit 15c to the open / close switch unit 15c under the control of the open / close determination unit 16e. As shown in FIG. 9, the open / close switch unit 15c opens the electrical path 15b based on the control signal for opening the electrical path 15b output by the open / close control unit 16f of the control circuit 16, that is, the contact J7. -Turn off J8.

  When the open / close switch unit 15c opens the electrical path 15b by the latching relay LRy configured by the polarity reversing unit 15, the first switch unit SW1, and the second switch unit SW2, the electrical path 15b is energized. Regardless of the presence or absence of the current I, the first switch unit SW1 maintains the continuity between the transport contacts J1-J3, and the second switch unit SW2 maintains the continuity between the transport contacts J4-J6. Therefore, even when DC power having a polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 of the polarity inverting unit 15, as described in the first embodiment, the polarity inverting unit 15 Since the polarity is inverted, DC power having the same polarity as that of the DC power supply 40 is conveyed to the input terminals T7 and T8 of the control circuit 16.

  As described above, in the second embodiment, in addition to the operation of the first embodiment, when DC power having the same polarity as that of the DC power supply 40 is conveyed to the input terminals T7 and T8 of the control circuit 16, the control is performed. The circuit 16 refers to the state flag stored in the storage unit 16d and opens the open / close switch unit 15c of the polarity inversion unit 15 through the open / close control unit 16f. Further, the first switch part SW1, the second switch part SW2, and the polarity matching part 15a constitute a latching relay LRy.

  Therefore, in addition to the effects of the first embodiment, the DC control device 10A of the second embodiment opens the electric path 15b after the DC power having the same polarity as that of the DC power supply 40 is supplied to the control circuit 16. Thus, by preventing the current I from flowing through the electric path 15b, the power consumption in the polarity reversing unit 15 can be reduced. Furthermore, the polarity matching unit 15a, the first switch unit SW1, and the second switch unit SW2 of the polarity inverting unit 15 constitute a latching relay LRy. For this reason, even after the electrical path 15b is opened, the conduction state of the conveyance contacts of the first switch unit SW1 and the second switch unit SW2 of the polarity reversing unit 15 can be fixed and maintained.

(Embodiment 3)
Next, Embodiment 3 of the present invention will be described with reference to the drawings. In the first or second embodiment, the connection between the outlet plug 2 and the DC outlet 11 shown in FIG. 1 is always maintained, or the connection of the wiring cord 3 is once released without always maintaining the connection. In addition, a state is assumed in which the input polarity at the terminal end 3b of the wiring cord 3 is not changed compared to that before the connection is released, that is, the reconnection is performed without the input polarity being inverted. However, when reconnection is made with the input polarity in the polarity reversing unit 5 reversed compared to before the disconnection described above, the polarity of the DC power supply and the input polarity in the polarity reversing unit 5 are accurately matched. There are cases where it is not possible. Therefore, in the third embodiment, as shown in FIG. 10, the diode R is not used in the electrical path 25b of the polarity reversing unit 25, and the polarity matching unit 25a controls the relay Ry in consideration of the direction in which the current I flows. It is what you do. The polarity matching unit 25a controls the relay Ry in consideration of not only whether the current I flows through the polarity matching unit 25a but also the direction in which the current I flows. Even in the case of reconnection, the same polarity as that of the DC power source can be appropriately matched. Hereinafter, the third embodiment will be described in detail.

  As shown in FIG. 10, the polarity reversing unit 25 includes a first switch unit SW1, a second switch unit SW2, and an electrical path 25b that is a wiring between the terminals T3 and T4. The electrical path 25b is provided with a resistor R and a polarity matching portion 25a. In the polarity inversion unit 25, the first switch unit SW1, the second switch unit SW2, and the polarity matching unit 25a constitute a relay Ry.

  The polarity matching unit 25a is configured by a coil, a triac, or the like, and exchanges the transport contacts of the first switch unit SW1 and the second switch unit SW2 according to the direction of the flow of the current I by energization of the electrical path 25b. The relationship between the current I generated by energization of the electrical path 25b and the transport contact that is conducted will be described with reference to FIG. FIG. 11 is an explanatory diagram showing the relationship between the direction in which the current I flows by energization of the electric path 25b and the transport contact that is conducted.

  As shown in FIG. 11, the first switch unit SW <b> 1 transports DC power so as to conduct between the transport contacts J <b> 1-J <b> 2 or between the transport contacts J <b> 1-J <b> 3 according to the direction of the current I by energization of the electric path 25 b. Swap the contacts. When the current I flows through the polarity matching unit 25a in the direction from the terminal T3 to the terminal T4 in the electrical path 25b, the first switch unit SW1 conducts between the transport contacts J1-J2. When the current I flows through the polarity matching unit 25a in the direction from the terminal 4 to the terminal 3 in the electrical path 25b, the first switch unit SW1 performs the exchange of the conveyance contact by the polarity matching unit 25a. Conduction is made between J1 and J3.

  The second switch unit SW2 switches the DC power carrying contacts so as to conduct between the carrying contacts J4-J5 or the carrying contacts J4-J6 in accordance with the direction of the current I by energization of the electric path 25b. When the current I flows through the polarity matching unit 25a in the direction from the terminal T3 to the terminal T4 in the electric path 25b, the second switch unit SW2 conducts between the transport contacts J4-J5. When the current I flows through the polarity matching unit 25a in the direction from the terminal 4 to the terminal 3 in the electric path 25b, the second switch unit SW2 performs the exchange of the conveyance contact by the polarity matching unit 25a. Conduction between J4 and J6.

  Since the resistance R is the same as that in the first or second embodiment, the description thereof is omitted.

  Next, the operation of the polarity reversing unit 25 when DC power having the same input polarity as the DC power source 40 is conveyed to the input terminals T1 and T2 will be described with reference to FIG. FIG. 12 is an explanatory diagram for explaining the operation of the polarity reversing unit 25 when DC power having the same polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2.

  When DC power having the same input polarity as that of the DC power supply 40 is conveyed to the input terminals T1 and T2 of the polarity inverting unit 25, the polarity inverting unit at the terminal end 3b of the wiring cord 3 as shown in FIG. The input polarities of the 25 input terminals T1 and T2 are a positive electrode and a negative electrode, respectively. In this case, since the current I flows through the polarity matching unit 25a in the direction from the terminal T3 to the terminal T4 in the electric path 25b, as shown in FIG. 11, the first switch unit SW1 is connected between the transport contacts J1-J2. The second switch part SW2 conducts between the transport contacts J4-J5.

  The DC power transferred to the input terminals T1 and T2 is transferred to the input terminals T1 and T2 through the transfer contacts J1-J2 of the first switch unit SW1 and the transfer contacts J4-J5 of the second switch unit SW2. The input polarity of power is not inverted and is conveyed to the output terminals T1 and T2. Therefore, since the output polarity of the DC power conveyed to the output terminals T1 and T2 has the same polarity as the input polarity of the DC power conveyed to the input terminals T1 and T2, the input terminals T7 and T8 of the control circuit 26 include DC power having the same polarity as the DC power supply 40 is carried.

  Next, the operation of the polarity reversing unit 25 when DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 will be described with reference to FIG. FIG. 13 is an explanatory diagram for explaining the operation of the polarity reversing unit 25 when DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2.

  When DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 of the polarity inverting unit 25, the polarity inversion at the terminal end 3b of the wiring cord 3 is performed as shown in FIG. The input polarities of the input terminals T1 and T2 of the unit 25 are a negative electrode and a positive electrode, respectively. In this case, since the current I flows through the polarity matching unit 25a in the direction from the terminal T4 to the terminal T3 in the electrical path 25b, as shown in FIG. 11, the first switch unit SW1 is connected between the transport contacts J1-J3. The second switch part SW2 conducts between the transport contacts J4-J6.

  The DC power transferred to the input terminals T1 and T2 is transferred to the input terminals T1 and T2 through the transfer contacts J1-J3 of the first switch unit SW1 and the transfer contacts J4-J6 of the second switch unit SW2. The input polarity of power is inverted and conveyed to the output terminals T1 and T2. Accordingly, since the output polarity of the DC power conveyed to the output terminals T1 and T2 is opposite to the input polarity of the DC power conveyed to the input terminals T1 and T2, the input terminals T7 and T8 of the control circuit 26 are input to the input terminals T7 and T8. DC power having a polarity opposite to the input polarity of the DC power transferred to the terminals T1 and T2, that is, DC power having the same polarity as the polarity of the DC power supply 40 is transferred.

  As described above, in the DC control device 10b according to the third embodiment, the diode R is not used in the electric path 25b of the polarity reversing unit 25, and the polarity matching unit 25a takes the relay Ry into consideration in the direction in which the current I flows. I tried to control it. For this reason, even if it is a case where it reconnects by plugging in and unplugging the outlet plug 2, etc., the same polarity as the polarity of the DC power supply can be properly matched without requiring the user to take any special measures. Is.

(Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to FIGS. The difference from the third embodiment is that an open / close switch portion 35c is additionally provided. Hereinafter, the fourth embodiment will be described.

  The open / close switch unit 35c opens the electrical path 35b based on a control signal for opening the electrical path 35b output by the open / close control unit 36f of the control circuit 36, that is, disconnects the contacts J7-J8. As in the second embodiment, the latching relay LRy is configured by the polarity inversion unit 35, the first switch unit SW1, and the second switch unit SW2. For this reason, even when the opening / closing switch part 35c opens the electrical path 35b, the first switch part SW1 keeps the conduction between the transport contacts J1-J3 fixed regardless of the presence or absence of the current I due to the energization of the electrical path 35b. The second switch unit SW2 keeps the conduction between the transport contacts J4-J6 fixed. Further, the open / close switch unit 35c may conduct the contacts J7-J8 based on a control signal for closing the electrical path 35c output by the open / close control unit 36f of the control circuit 36.

  The control circuit 36 includes at least a power supply circuit 36a, a DC / DC converter 36b, a controller 36c, and an open / close control unit 36f. The controller 36c includes a storage unit 36d and an open / close determination unit 36e.

  The power supply circuit 36 a is supplied with DC power having the same polarity as the DC power supply 40 supplied to the control circuit 36, and supplies necessary power to each part in the control circuit 36.

  The DC / DC converter 36b generates DC power necessary for driving the controller 36c among the DC power supplied from the power supply circuit 36a, and supplies the generated DC power to the controller 36c.

  The storage unit 36d of the controller 36c stores a state flag indicating an open state or a closed state of the electrical path 35b of the polarity reversing unit 35, that is, a non-conductive state or a conductive state of the contacts J7-J8 of the open / close switch unit 35c. Yes. For example, when the electrical path 35b of the polarity reversing unit 35 is closed, that is, when the contacts J7-J8 of the open / close switch unit 35c are conductive, the storage unit 36d has a state flag indicating the closed state. “1” is stored. When the electrical path 35b of the polarity reversing unit 35 is opened, that is, when the contacts J7-J8 of the open / close switch unit 35c are non-conductive, the storage unit 36d has a state flag “ “0” is stored.

  The open / close determination unit 36e of the controller 36c refers to the state flag stored in the storage unit 36d to determine whether the open / close switch unit 35c of the polarity reversing unit 35 needs to be opened or closed. The open / close determination unit 36e of the controller 36c causes the open / close control unit 36f to open the open / close switch unit 35c when DC power having the same polarity as the DC power supply 40 is conveyed to the input terminals T7 and T8 of the control circuit 36. The open / close control unit 36f is controlled.

  The open / close control unit 36f opens the open / close switch unit 35c when the DC power having the same polarity as the DC power supply 40 is supplied to the input terminals T7 and T8 of the control circuit 36 under the control of the open / close determination unit 36e. Control signal is output to the opening / closing switch section 35c.

  Next, with reference to FIGS. 15 and 16, the operation of the polarity inverting unit 35 and the control circuit 36 when DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2. explain. FIG. 15 is an explanatory diagram showing a state before the opening / closing switch part 35c is opened. FIG. 16 is an explanatory diagram showing a state after the opening / closing switch portion 35c is opened. In addition, it is assumed that the open / close switch portion 35c is closed in advance, that is, the conductive state between the contacts J7 and J8. The following description can also be applied to the case where DC power having an input polarity that is the same polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2. Furthermore, the relationship between the direction in which the current I flows due to energization of the electrical path 25b described in the third embodiment and the transport contact that is conducted is also applicable to the fourth embodiment.

  When DC power having an input polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 of the polarity inverting unit 35, the polarity inversion at the terminal end 3b of the wiring cord 3 is performed as shown in FIG. The input polarities of the input terminals T1 and T2 of the unit 35 are a negative electrode and a positive electrode, respectively. In this case, since the current I flows through the polarity matching section 35a in the direction from the terminal T4 to the terminal T3 in the electric path 35b, the first switch section SW1 conducts between the transport contacts J1-J3 and the second switch The part SW2 conducts between the transport contacts J4-J6.

  The DC power transferred to the input terminals T1 and T2 is transferred to the input terminals T1 and T2 through the transfer contacts J1-J3 of the first switch unit SW1 and the transfer contacts J4-J6 of the second switch unit SW2. The input polarity of power is inverted and conveyed to output terminals T5 and T6. Therefore, since the output polarity of the DC power conveyed to the output terminals T5 and T6 is opposite to the input polarity of the DC power conveyed to the input terminals T1 and T2, the polarity of the input terminals T7 and T8 of the control circuit 36 is DC power having a polarity opposite to the input polarity of the DC power transferred to the input terminals T1 and T2 of the inverting unit 35, that is, DC power having the same polarity as that of the DC power supply 40 is transferred.

  When DC power having the same polarity as that of the DC power supply 40 is conveyed to the input terminals T7 and T8 of the control circuit 36, the open / close determination unit 36e of the controller 36c has a state flag “1” stored in the storage unit 36d. , The open / close control unit 36f controls the open control unit 36f so as to open the open / close switch unit 35c. The open control unit 36f outputs a control signal for opening the open / close switch unit 35c to the open / close switch unit 35c under the control of the open / close determining unit 36e. As shown in FIG. 16, the open / close switch unit 35c opens the electrical path 35b based on the control signal for opening the electrical path 35c output by the open / close control unit 36f of the control circuit 36, that is, the contact J7. -Turn off J8.

  In addition, when the open / close switch unit 35c opens the electrical path 35b by the latching relay LRy configured by the polarity inversion unit 35, the first switch unit SW1, and the second switch unit SW2, the electrical path 35b is energized. Regardless of the presence or absence of the current I, the first switch unit SW1 maintains the continuity between the transport contacts J1-J3, and the second switch unit SW2 maintains the continuity between the transport contacts J4-J6. Therefore, even when DC power having a polarity opposite to that of the DC power supply 40 is conveyed to the input terminals T1 and T2 of the polarity reversing unit 35, as described in the third embodiment, the polarity reversing unit 35 Since the polarity is inverted, DC power having the same polarity as that of the DC power supply 40 is conveyed to the input terminals T7 and T8 of the control circuit 36.

  Next, as shown in FIG. 16, after the opening / closing switch portion 15c is opened, when the outlet plug 2 is once removed from the DC outlet 11 and inserted again, the input terminals T1 and T2 are the same as the DC power supply 40. A case where DC power having an input polarity which is a polarity is conveyed will be described with reference to FIGS. 17 to 19. That is, in FIGS. 17 to 19, the input polarities of the input terminals T1 and T2 immediately before the outlet plug 2 is unplugged from the DC outlet 11, and the input polarities of the input terminals T1 and T2 immediately after the outlet plug 2 is inserted. The operation of the DC control device 10c when is reversed will be described.

  FIG. 17 is an explanatory diagram showing a state when the plug 2 is removed from the DC outlet 11 from the state shown in FIG. 16, and DC power having the same polarity as that of the DC power supply 40 is no longer supplied to the control circuit 36. It is shown that the switch portion 35c is in a closed state, that is, an initial conductive state between the contacts J7 and J8.

  FIG. 18 shows a state before the opening / closing switch unit 15c is opened after DC power having the same polarity as the DC power supply 40 is conveyed to the input terminals T1 and T2 from the state shown in FIG. . The input polarities of the input terminals T1 and T2 of the polarity inversion unit 35 at the terminal end 3b of the wiring cord 3 are a positive electrode and a negative electrode, respectively. In this case, since the current I flows through the electric path 35b in the direction from the terminal 3 to the terminal 4 via the polarity matching unit 35a, the first switch unit SW1 conducts between the transport contacts J1 and J2, and the second switch The part SW2 conducts between the transport contacts J4-J5.

  The DC power conveyed to the input terminals T1 and T2 is conveyed to the output terminals T5 and T6 through the conveyance contacts J1-J2 of the first switch unit SW1 and the conveyance contacts J4-J5 of the second switch unit SW2. Therefore, DC power having the same polarity as that of the DC power supply 40 is conveyed to the input terminals T7 and T8 of the control circuit 36.

  After DC power having the same polarity as the DC power supply 40 is conveyed to the input terminals T7 and T8 of the control circuit 36, the open / close switch unit 35c opens the electrical path 35b output by the open / close control unit 36f of the control circuit 36. Based on the control signal to that effect, the electrical path 35b is opened, that is, the contacts J7-J8 are made non-conductive, as shown in FIG.

  Further, even after the open / close switch unit 35c opens the electrical path 35b by the latching relay LRy including the polarity inversion unit 35, the first switch unit SW1, and the second switch unit SW2, the energization of the electrical path 35b is performed. Regardless of the presence or absence of the current I, the first switch SW1 keeps the conduction between the transport contacts J1-J2 fixed, and the second switch SW2 keeps the conduction between the transport contacts J4-J5 fixed.

  As described in the second embodiment, the DC control device 10c according to the fourth embodiment has the electric path 35b after DC power having the same polarity as that of the DC power supply 40 is supplied to the control circuit 36. Is opened to prevent the current I from flowing through the electric path 35b, thereby reducing the power consumption in the polarity reversing unit 35c. Furthermore, even if the outlet plug 2 is unplugged and reconnected, the same polarity as that of the DC power supply can be properly matched without requiring the user to take any special measures. is there.

  Although various embodiments of the present invention have been described above, the present invention is not limited to the matters shown in the above-described embodiments, and those skilled in the art can make modifications and applications based on the description and well-known techniques. This is also the scope of the present invention, and is included in the scope for which protection is sought.

  The present invention is not limited to a DC-compatible device that operates using an existing DC power as a driving source, as represented by a PC (Personal Computer), an LED (Light Emitting Diode) lighting fixture, and the like, and a conventional AC power is used as a driving source. It can be applied to a DC-compatible device in which a home electric appliance or the like that is operating operates using DC power as a drive source.

1a, 1b Outlet connection plug blade 2 Plug 3, 3A, 3B Wiring cord 3a, 3Ba Starting end 3b, 3Ab, 3Bb Ending 4, 4A, 4B Printed circuit board 5, 5A, 5B, 15 Polarity reversing portion 5a, 15a Polarity matching portion 5b , 15b Electrical path 6, 6A, 6B, 16 Control circuit 10, 10A, 10B DC control device 11 DC outlet 12a, 12b Connection port 13 Transport path 15c Open / close switch section 16a Power supply circuit 16b DC / DC converter 16c Controller 16d Storage section 16e Open / close determination unit 16f Open / close control unit 20 Indoor unit 30 Outdoor unit 40 DC power supply 100 DC compatible devices J1 to J6 Carrying contact J7, J8 Contact LRy Latching relay Ry Relay SW1 First switch unit SW2 Second switch unit T1, T2, T7, T8 input terminal T3, T4 terminal T5, T6 output terminal Child

Claims (6)

DC control equipment provided in any device that operates with DC power,
A wiring cord connected as a transfer path of the DC power;
A control circuit for controlling the operation of the apparatus by the DC power conveyed through the wiring cord;
A polarity reversing unit provided between the end of the wiring cord and the control circuit,
The polarity reversing unit is provided between lines that carry the DC power to the control circuit and is energized when the polarity of the DC power is reversely connected. A switch unit that replaces the transport contacts, and a polarity matching unit that controls the operation of the switch unit, and when the electrical path is energized, by switching the transport contacts of the switch unit by the polarity matching unit, A DC control device characterized by inverting the polarity of the DC power at the end of the wiring cord. The DC control device according to claim 1,
The DC control device, wherein the polarity reversing unit non-inverts the polarity of the DC power at the end of the wiring cord when the energization of the electrical path is cut off. The DC control device according to claim 1 or 2,
The DC control device according to claim 1, wherein the electrical path has a resistance for adjusting a current passed through the electrical path. The DC control device according to any one of claims 1 to 3,
The polarity reversing unit is provided with an open / close switch unit that opens the electrical path,
The control circuit includes an open / close determination unit that outputs a control signal for opening the open / close switch unit, and an open / close control that controls the open / close switch unit to open according to the control signal output by the open / close determination unit. And comprising
When the DC power is supplied through the polarity reversing unit, the open / close determination unit controls the open / close control unit to open the open / close switch unit. The DC control device according to any one of claims 1 to 4,
The DC control device, wherein the polarity determination unit and the control circuit are provided on the same printed circuit board.   A DC-compatible device comprising the DC control device according to claim 1.

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