JP3978422B2 - Automatic switching power supply method and power supply apparatus having the function - Google Patents

Description

  In the present invention, when an electric and electronic circuit receiving one power supply receives another power supply, the power supply is automatically transferred from one plug socket to another without stopping the power supply or preparing a standby power supply. The present invention relates to an automatic switching power feeding method that can be switched automatically and a power feeding device having the function.

  When moving the installation location in an OA (office automation) device, a POS (sales point of sale) device, etc. in an information processing device including an electric / electronic circuit that requires power supply, it is necessary to change the plug socket for power supply There is. Even in such a state, there is a case where it is not desired to stop the power supply to the electric / electronic circuit.

  For example, when an information processing device or the like is turned off, there may be a problem in the time for restarting. For example, when work in a short time is accumulated such as layout change or store renovation, when there is a restriction on the time when power supply can be stopped because there is a user like a server, further in the equipment manufacturing line In some cases, the process is moved by a test process or the like. In such a case, there has been a desire to change the connection location of the plug socket without stopping power feeding.

  As a solution to the above problems, UPS (uninterruptible power supply) is widely used. That is, a conventional power supply apparatus having an automatic switching function is provided with a well-known UPS built into the device or connected to a power supply unit of the device.

  For example, as shown in FIG. 11, the power supply apparatus having the automatic switching function has a storage battery 101 as a standby power supply, and receives power from the storage battery 101 by operating the switch SW when the power supply is stopped. It is. In the case of an AC power source as shown in the figure, the storage battery 101 is charged by receiving an AC input via the charger 102, and the DC of the storage battery 101 is supplied to the DC / DC converter 103 and the inverter 104 by switching the switch SW. It is converted into alternating current and supplied to electrical and electronic equipment.

  In electrical and electronic circuits that require power supply, when moving the installation location without stopping power supply, when switching the power supply plug socket, a device such as UPS (uninterruptible power supply) is used. Used.

  The problem to be solved is that, as described above, a backup storage battery is used in the UPS, and switching is subject to time constraints depending on the storage battery capacity, and there is also a size and cost limitation of the device. That is.

The present invention is for supplying power to electrical and electronic circuits in an uninterruptible when switching the receiving power having polarity, and one of the feeder circuit for feeding the output of the plurality of power receiving circuit and a power receiving circuit to the electrical and electronic circuits It has. Each of the power receiving circuits includes a power receiving unit that accepts a power input having two polarities, and one of the polarities as a polarity reference, and when receiving a power receiving input, the same polarity input is compared with the polarity reference. When receiving an input of a different polarity, the input electrode detection unit sends out each as a switching setting when receiving an input of a different polarity, an input having a polarity in the power receiving unit, and an output of the power feeding circuit Between the two lines, and when receiving the order setting from the receiving electrode detection unit, when connecting the two lines between the input and output, when receiving the switching setting Includes a switching connection for matching the polarities of the two wires between the input and output, and a polarity matching switching unit for executing each. The power supply circuit includes an output detection unit that detects the polarity of the output when receiving an output from one of the power reception circuits and sends an output detection signal to all the power reception circuits as the polarity reference.

The electrode receiving property detection unit first sets the order when receiving an input in an initial state without an output detection signal from the output detection unit, and receives the input while receiving the output detection signal from the output detection unit. When receiving an input with the same polarity as the polarity of the output detection signal, the order is set while receiving an input with a different polarity. Two input detection relays for notifying the polarity matching switching unit and connecting one winding terminal to each of the two input wires and connecting the other winding terminal in common and each having two make contacts (A, B). The output detection unit includes an output detection relay (D) connected between two output lines and having one make contact and the same number of break contacts as the power receiving circuit. The polarity matching switching unit includes one make contact of each of the two input detection relays on one input line, and the other make contact of each of the two input detection relays on the other line and a break of the output detection relay. Connect each with a contact. The other winding terminal of the two input detection relays connected in common is connected to a make contact and a break contact of the output detection relay, and one winding terminal of the output detection relay is one of the power receiving circuits. Connected to one make contact of the input detection relay and the other make contact of the other input detection relay, and the other winding terminal of the output detection relay is connected to the other make contact of the one input detection relay of each of the power receiving circuits. The contact is connected to the one make contact of the other input detection relay and the make contact of the output detection relay.

Therefore, with this configuration, power can be supplied simultaneously from a plurality of plug sockets, for example, and electric power can be supplied to the electric / electronic circuit without any failure, and the polarity on the power receiving side can be automatically matched to the polarity on the power supply side. For example, even if the input A-line, B-line, and ground (E) line are fixed at the tip of the asymmetrical plug, this is detected even if the plug socket on the power supply side is reversely connected. Abnormal connection can be prevented.

  In such a circuit configuration, once power is supplied from an electric power supply circuit to an external electric / electronic device, the same holding state of the circuit can be maintained by the output detection signal as long as the input connection is not limited to all power receiving units. Therefore, any power receiving unit can accept a power receiving input without any obstacle regardless of the polarity, so that multiple connections by a plurality of power receiving units are possible without extra effort or thought.

  In the case of single-phase three-wire, the ground level can be selected as the polarity reference. In this configuration, it is possible to detect the polarity of each of the two power receiving inputs from the ground level. Therefore, the detected polarity is matched with the predetermined polarity on the output side.

  Further, in a DC power supply, a rectifier such as a diode can detect the polarity and can be connected to a predetermined positive / negative polarity of a power supply output.

  An automatic switching power supply method and a power supply apparatus having the function of the present invention are provided with a plurality of power reception units, a polarity reference is determined in advance, and the input two wires of each of the power reception units are compared with the polarity reference, and at least one polarity is set. When the polarity of the two input wires differs from the two output wires, the power supply output may be stabilized by automatically switching and connecting the input side polarity to the output side polarity. it can.

  For this reason, as long as power is output from any one of the power receiving inputs, even if there is an incorrect connection on the input side of the other power receiving input, the polarity is automatically matched to make a switching connection, so power can be supplied without any problems. Can output. Therefore, when moving the position of the electrical and electronic equipment, it is possible to leave the connection of the destination after temporarily connecting to the plug sockets of both the source and destination, and supply power with a simple circuit configuration. The connection of the power receiving power source by the plug socket can be switched without stopping the power supply and without being influenced by the polarity of the power receiving side.

  A device for supplying power to electrical and electronic equipment, with the purpose of switching the power receiving input system without using a backup storage battery, each having a plurality of input systems and supplying power to the electrical and electronic circuit with one output system, and Achieved by setting the polarity reference in advance, detecting the polarity of the input system in comparison with the specified polarity reference, and automatically switching the input / output connection so that the polarity of the input system matches the polarity of the output system did.

  Therefore, even if the same type of input system is connected to another input system with a different polarity, the polarity of the input system is detected by comparing it with a predetermined polarity standard and the input system polarity matches the polarity of the output system. You can automatically switch and connect to For this reason, even if the input system is connected with the opposite polarity to the two wires of the power receiving input, there is no abnormality in the power feeding to the electric and electronic circuit, and the power feeding is not stopped. Of course, a backup power source such as a secondary power source can be dispensed with separately.

  The present invention will be described below with reference to the drawings. The illustrated circuit is shown for a simple single-phase, two-wire power supply to aid in understanding the subject matter of the invention.

  With reference to FIG. 1, the form by the basic composition of the electric power feeder by this invention is demonstrated. In the drawings, only the main parts according to the present invention are shown, and the elements that are necessary components are omitted from the drawings.

  The power supply apparatus shown in the figure includes power receiving circuits 1 and 2 that receive power supply, and a power supply circuit 3 that supplies input from the power receiving circuit to electric and electronic equipment. The power receiving circuits 1 and 2 are configured by power receiving units 11 and 21, electrode receiving detection units 12 and 22, and polarity matching switching units 13 and 23, and the power feeding circuit 3 is configured by a power feeding unit 30. Although only two systems of power reception circuits are illustrated, they may be provided in parallel.

  The power receiving unit 11 is a part that receives a single system input having an A line and a B line, and generally has a ground line though not shown. For example, the power receiving unit 11 includes a plug that is inserted into a plug socket to which power is supplied to receive power. The A line and the B line that receive power are connected to the electrode receiving detection unit 12 and the polarity matching switching unit 13. The plug may be provided at the tip of the power cord. For example, as in a portable device, prepare a separate power cord to be inserted into the plug socket to which power is supplied, and connect it to the plug socket of the power cord as the receptacle The plug provided in the concave socket that can be formed may be provided directly on the apparatus housing. This concave socket is preferably provided with a lid.

  The electrode receiving property detection unit 12 determines the polarities of the A line and the B line based on a predetermined polarity reference, detects the two polarities, and uses these polarities as the A line and the B line of the power supply output. Compare with each polarity. As a result, the polarity matching switching unit 13 is notified of the forward connection setting when the polarities of the A line and the B line match, and the switching connection setting when they do not match. The polarity reference is, for example, the polarity of the A line or B line on the power supply output side, the ground level, and the like.

  When the polarity matching switching unit 13 receives the forward connection setting, the polarity matching switching unit 13 connects the input side A line to the output A line and the input side B line to the output B line, while receiving the switching connection setting. In this case, the A line on the input side is connected to the output B line, and the B line on the input side is inverted or crossed to the output A line.

  The power receiving unit 21, the electrode receiving property detecting unit 22, and the polarity matching switching unit 23 have the same functions as the power receiving unit 11, the electrode receiving property detecting unit 12, and the polarity matching switching unit 13 having the same names described above. The explanation is omitted.

  The power feeding unit 30 connects the output A line and the output B line output from the polarity matching switching units 13 and 23, and feeds power to the electric / electronic device through, for example, one plug socket. Of course, as long as the power capacity is satisfied, power can be supplied to a plurality of electrical and electronic devices through a plurality of plug sockets. Further, when this apparatus is built in an electric / electronic device, the power supply unit 30 may be composed of, for example, only a fuse, or the connection tool may be omitted only by the connection line.

  Next, the functional configuration of the first embodiment will be described with reference to FIG.

  The difference between FIG. 2 and FIG. 1 is that when power is received for the first time, the connection is made in order and the polarity of the output side B line is used as the polarity reference. With this configuration, after receiving power reception input in one input system in the initial state and starting power supply output, even if the same type input system is connected to another input system with different polarity, the polarity of the input system is Can be detected by comparing with a predetermined polarity reference, and the polarity of the input system can be automatically switched and connected to match the polarity of the output system. Here, the polarity reference is the polarity of the output side B line, but it may be the polarity of the output side A line.

  That is, the power supply apparatus shown in the figure includes power reception circuits 1A and 2A that receive power supply and a power supply circuit 3 that supplies input from the power reception circuit to electrical and electronic equipment. The power receiving circuits 1A and 2A include power receiving units 11A and 21A, electrode receiving property detecting units 12A and 22A, and polarity matching switching units 13A and 23A. The power feeding circuit 3A adds an output detecting unit 31A to the power feeding unit 30. Configured. Although only two systems of power reception circuits are illustrated, they may be provided in parallel.

  The power receiving unit 11A has the same configuration as that described with reference to FIG. 1, and receives power from the two lines A and B with the polarities N and L to receive the electrode receiving property detecting unit 12A and the polarity matching switching unit. It shall be connected to 13A.

  As described above, when receiving power for the first time, the electrode receiving property detection unit 12A outputs the order setting for sequential connection to the polarity matching switching unit 13A and connects the power reception input to the power supply output to output the detection unit 31A. The output detection signal is received from. The output detection signal shown in the figure is the polarity of the output side B line, and this is used as a polarity reference. Therefore, when receiving the output detection signal, the electrode receiving property detection unit 12A maintains the set state with the polarity of the output side B line as the polarity reference. All the electrode receiving property detection units 12A receive an output detection signal that is a polarity reference when the power supply state is set on the output side, not limited to the initial state. The polarity reference is for determining the polarity of the A-line and B-line of the power receiving input based on this polarity reference, and the detected polarity is compared with the polarity of each of the A-line and B-line of the power supply output. As a result, when the polarities of the A line and the B line coincide with each other, the forward connection setting is notified to the polarity matching switching unit 13A.

  The polarity matching switching unit 13A is the same as the polarity matching switching unit 13 described with reference to FIG.

  The power receiving unit 21A, the electrode receiving property detecting unit 22A, and the polarity matching switching unit 23A have the same functions as the power receiving unit 11A, the electrode receiving property detecting unit 12A, and the polarity matching switching unit 13A having the same names described above. The explanation is omitted.

  The power feeding unit 30 is the same as that described with reference to FIG.

  The output detection unit 31A has a power receiving input connected to the output side A line and B line, detects power feeding to the electric and electronic equipment, and sets the polarity of the output B line as a polarity reference output signal to the all electrode receiving property detection unit 12A. , 22A.

  Next, the main procedure of the power supply apparatus when receiving power for the first time in the initial state will be described with reference to FIG. 3 together with FIG. Here, it is assumed that in the power receiving circuit 1A, a power source is first connected as a power feeding device, for example, the N pole is connected to the A line and the L pole is connected to the B line.

  When the power receiving unit 11A is initially connected as a power supply device (procedure S1), the electrode receiving property detecting unit 12A in the initial state detects the polarity N from the A line side and sets the forward connection to the polarity matching switching unit 13A. (Procedure S2). The detected polarity N is the polarity of the input A line, and becomes the polarity L in the case of reverse connection. In this first case, the polarity matching switching unit 13A sets forward connection, and connects the A line on the input side to the output A line and the B line to the output B line (step S3).

  As a result, the output detection unit 31A detects the potential difference between the A line and the B line from the potential difference between the output A line and the output B line, and based on the detection of this output, the polarity of the output B line as an output detection signal based on the polarity L is supplied to all the electrode receiving detectors 12A and 22A (step S4).

  The electrode receiving detection unit 12A receiving power from the power receiving unit 11A receives the polarity L of the output B line of the output detection signal, and continues to detect the polarity N corresponding to the polarity L on the input A line side. Therefore, the connection state of the polarity matching switching unit 13A is maintained (step S5).

  On the other hand, the electrode receiving property detection unit 22A that has not received a power supply inputs the polarity L of the output B line of the output detection signal. Therefore, of the polarities of the input A line and B line when receiving power by connecting a plug. A preparatory state is formed by comparing the polarity N with the polarity L of the output B line (step S6).

  Next, with reference to FIG. 4 and FIG. 2 and FIG. 3 together, the main procedure in the case where the power receiving circuit 2A not receiving power is double received will be described.

  In step S6, the electrode receiving property detection unit 22A compares the potentials of the A line and the B line input during power reception with the potential of the output B line to form a preparation state for detecting and determining the polarity (procedure S10). )is doing.

  In this state, when a power source is connected to the power receiving unit 21A (step S11), the electrode receiving property detecting unit 22A should compare the polarity of the A line and the B line with the polarity L of the output B line and perform the sequential connection. It is determined whether or not (step S12).

  When step S12 is “YES” and forward connection is established, the electrode receiving detection unit 22A detects the polarity N that opposes the polarity L of the output detection signal on the A line side, so forward connection is set in the polarity matching switching unit 13A. Operate as much as possible (procedure S13). Based on the forward connection setting, the polarity matching switching unit 13A connects the A line on the input side to the output A line and the B line to the output B line (step S14).

  Accordingly, the electrode receiving detection unit 22A receiving power from the power receiving unit 21A continues to detect the input A-line side polarity N, and the connection state of the polarity matching switching unit 23A is maintained (step S15).

  As a result, in the power receiving circuits 1A and 2A, both the two input systems are redundantly connected with the same polarity (step S16), and the output detection signal is continuously received from the output detection unit 31A with the polarity L of the output B line.

  When the procedure S12 is “NO” and the connection is reverse, the electrode receiving property detection unit 22A detects the polarity N opposite to the polarity L of the output detection signal on the B line side. Therefore, the electrode receiving property detection unit 22A operates to set reverse connection to the polarity matching switching unit 23A (step S17). Based on this reverse connection setting, the polarity matching switching unit 23A connects the B line on the input side to the output A line and the A line to the output B line (step S18).

  Therefore, the electrode receiving property detection unit 22A receiving power from the power reception unit 21A continues to detect the input B-line side polarity N, and the connection state of the polarity matching switching unit 23A is maintained (step S19).

  As a result, the process proceeds to step S16, and in the power receiving circuits 1A and 2A, the two input systems are connected to each other with the opposite polarities, and the polarity N is connected to the output A line and the polarity L is connected to the output B line. That is, reception of the output detection signal from the output detection unit 31A with the polarity L of the output B line is continued.

  If the power reception of the power receiving circuit 1A disappears after this state, the power receiving circuit 1A is maintained until the state of the above-described step S10 disappears in the power feeding device.

  In the above description, only two input systems have been illustrated and described, but the third and subsequent power receiving circuits also perform the same functional operation as the power receiving circuit 2A. Therefore, in the power feeding apparatus, as long as any power receiving circuit has a power receiving input and generates a power feeding output, the power receiving input can be freely connected or disconnected regardless of the forward or reverse polarity connection.

  In the above description, the power feeding device is described as being externally attached independently of the electric / electronic device. However, the electric / electronic device may be incorporated together with the device.

  The block diagram of FIG. 2 of the first embodiment described above will be described with reference to one circuit realized using a relay in FIG. That is, FIG. 5 is a diagram showing a relay circuit as an embodiment of FIG.

  The power reception circuit 1A includes two input systems including power reception units 11A and 21A, electrode reception detection units 12A and 22A, and polarity matching switching units 13A and 23A. The power receiving unit 11A and the power receiving unit 21A are concave sockets each having a plug with a switch, for example, which is a single-phase three-wire type having a grounding wire and each of which is formed by a double contact. The electrode receiving property detection unit 12A includes a relay A1 and a relay B1 each having two make contacts. Similarly, the electrode receiving property detection unit 22A includes a relay A2 and a relay B2 each having two make contacts.

  The polarity matching switching unit 13A is formed by a make contact of the relay A1 and the relay B1, and the polarity matching switching unit 23A is formed by a make contact of the relay A2 and the relay B2.

  The power feeding circuit 3A includes a relay D having three contacts, that is, one make contact and a number of power receiving circuit break contacts for output detection. The power feeding unit 30 is a single-phase three-wire type plug socket having, for example, an A line and a B line having a ground line, and is connected to a power plug of an electric / electronic device.

  The relay A1 terminal 1 (hereinafter referred to as A1-1, and other relay terminals are also described in the same manner) is connected to the A line of the power receiving unit 11A. The relay B1-1 is connected to the B line of the power receiving unit 11A. The relay A2-1 is connected to the A line of the power receiving unit 21A. The relay B1-1 is connected to the B line of the power receiving unit 21A. Relay A1-2, relay B1-2, relay A2-2, and relay B2-2 are connected to all contacts d0 to d2 of relay D.

  The make contact a1-1 and the make contact b1-1 are connected to the A line of the power receiving unit 11A. Similarly, the make contact a1-2, the make contact b1-2, and the break contact d1 are connected to the B line of the power receiving unit 11A. The make contact a2-1 and the make contact b2-1 are connected to the A line of the power receiving unit 21A. The make contact a2-2, the make contact b2-2, and the break contact d2 are connected to the B line of the power receiving unit 21A.

  The make contact a1-1, the make contact b1-2, the make contact a2-1, and the make contact b2-2 are connected to the relay D-1 and the output A line. The make contact a1-2, the make contact b1-1, the make contact a2-2, and the make contact b2-1 are connected to the relay D-2, the make contact d0, and the output B line.

  Next, the operation of the circuit will be described in detail with reference to FIGS. 3 and 4 in FIGS.

  FIG. 6 is an explanatory diagram of a state in the case where the process proceeds to step S3 in FIG. 3 when a power supply having a polarity N is connected to the A line and a polarity L is connected to the B line of the power receiving unit 11A in the circuit of FIG. It is.

  As shown in the figure, when there is a power receiving input to the power receiving unit 11A, in the electrode receiving property detecting unit 12A, the relay B1 is short-circuited by the break contact d1 and does not operate. It operates by the potential difference. Therefore, in the polarity matching switching unit 13A, the input A line is connected to the output A line by the make contact a1-1, the input B line is connected to the output B line by the make contact A1-2, and the relay D is connected between the two lines. The potential difference is given. Therefore, as the relay D operates, the output A line becomes the polarity N, and the output B line becomes the polarity L.

  FIG. 7 is an explanatory diagram showing the state of steps S5 and S6, following step S4 in FIG.

  When the relay D operates in FIG. 6, as shown in FIG. 7, the output B line is supplied to the terminal 2 of each relay with the polarity L by the make contact d0. On the other hand, the break contacts d1, d2 connected to the B lines of the power receiving units 11A, 21A operate later than the make contact d0, and disconnect the connection with the input B line at each of the power receiving units 11A, 21A.

  In the state shown in FIG. 7, when the power receiving unit 21A is connected to a power source having polarity N on the A line and polarity L on the B line, the A line of polarity N has the polarity L in the polarity detection switching unit 22A. Since a potential difference is generated between the output B line and the relay A2, the relay A2 operates. Accordingly, the A line on the input side is connected to the output A line by the make contact a2-1, and the B line is connected to the output B line by the make contact A2-2. Accordingly, the polarity matching switching unit 23A is in the same circuit formation state as the polarity matching unit 13A described above.

  FIG. 8 is an explanatory diagram of circuit operation showing a case where an input is connected to each of the A line and the B line of the power receiving unit 21A in the state of FIG. 7 with a polarity opposite to that of the power receiving unit 11A. That is, as shown in the drawing, the polarity L is connected to the A line, and the polarity N is connected to the B line.

  In this state, the relay A2 does not operate because the polarity L is connected to both terminals thereof. However, the relay B2 in which the polarity L is connected to the terminal 2 operates because the polarity N is connected to the terminal 1. Therefore, the contact b2-1 and the contact b2-2 operate to close the circuit. As a result, the A line of the power receiving unit 21A is reversely connected to the output B line, and the B line is reversely connected to the output A line, so that the polarities can be matched.

  In this state, even if either the power receiving unit 11A or the power receiving unit 21A stops receiving power, only the relay of the power receiving circuit is restored, and the polarity at the output is not changed. Therefore, normal operation is possible as described above even if the vacant power receiving unit receives power with the forward or reverse polarity again.

  Even when two or more power receiving circuits each including a power receiving unit, a receiving electrode property detecting unit, and a polarity matching switching unit are further provided in parallel as shown in FIG. The polarities of the A and B lines connected to the output A and the output B lines are maintained as they are, and all the power receptions are lost and the initial state is maintained. Therefore, as described with reference to FIG. 8, an electric / electronic device that receives power supply can continue to operate normally without causing a failure even when reversely connected.

  Example 2 will be described with reference to FIG. 9 as another embodiment of the present invention. In this embodiment, the polarity reference is obtained from the ground level.

  FIG. 9 is an explanatory diagram showing a circuit according to the second embodiment of the apparatus of the present invention.

  The power receiving circuits 1B and 2B show two input systems by the power receiving units 11B and 21B, the electrode receiving detectors 12B and 22B, and the polarity matching switching units 13B and 23B, respectively. The power receiving unit 11B and the power receiving unit 21B are single-phase three-wire systems having a ground wire, and the A wire, the B wire, and the ground wire are connected to the electrode receiving detectors 12B and 22B, respectively.

  The electrode receiving property detection unit 12B includes a relay A1 and a relay B1 each having two make contacts in the same manner as in the second embodiment, and further includes a relay D1 for detecting a power receiving input having three make contacts. Similarly, the electrode receiving property detection unit 22B includes a relay A2 and a relay B2 each having two make contacts, as in the second embodiment, and further includes a relay D2 for detecting a power receiving input having three make contacts. The polarity matching switching unit 13B and the polarity matching switching unit 23B have a make contact of the relay A1 and the relay B1, respectively, and the make contact of the relay A2 and the relay B2, respectively. The power feeding unit 30 is the same as that in the above-described embodiment, and the description thereof is omitted.

  Next, a circuit formed by each relay and its contact will be described.

  First, in the electrode receiving detection unit 12B, the relay D1-1 is connected to the input side A line, and the relay D1-2 is connected to the input side B line to detect the power receiving input. The AD (AC / DC) conversion circuit receives a power reception input via make contacts d1-1 and d1-2, and generates a DC power supply. The DC power generated by the AD conversion circuit is a driving power for the comparator Y1, the negative logic circuit X1, the relay A1, and the relay B1. Relay A1-1 and relay B1-1 are connected to an AD conversion circuit, and each of relay A1-2 and relay B1-2 is connected to a ground line via a drive transistor. Each drive transistor has an output of the comparator Y1 that inputs the A line and the B line on the input side via make contacts d1-1 and d1-2, and an output of the negative logic circuit X1 that receives this output, respectively. Driven by.

  Therefore, as shown in the drawing, the make contacts d1-1, d1-2, and d1-3 connect the input side A line, B line, and ground line to the drive circuits of the relays A1 and B1, respectively, From the potential difference between the A line, the B line, and the ground line, the circuit is configured such that the relay A1 is driven when the polarity N is connected to the A line, and the relay B1 is driven when the polarity N is connected to the B line. Shall be. The electrode receiving detector 22B has the same circuit configuration.

  In the polarity matching switching unit 13B, the make contact a1-1 and the make contact b1-1 are connected to the A line of the power receiving unit 11B. Similarly, the make contact a1-2 and the make contact b1-2 are connected to the B line of the power receiving unit 11B. The make contact a2-1 and the make contact b2-1 are connected to the A line of the power receiving unit 21B. The make contact a2-2 and the make contact b2-2 are connected to the B line of the power receiving unit 21B. The make contact a1-1, the make contact b1-2, the make contact a2-1, and the make contact b2-2 are connected to the output A line. The make contact a1-2, the make contact b1-1, the make contact a2-2, and the make contact b2-1 are connected to the output B line. The polarity matching switching unit 23B has a similar circuit configuration.

  Accordingly, the power receiving unit 11B, that is, the electrode receiving property detecting unit 12B has a power receiving input, and the polarity N of the A line and the polarity L of the B line together with the ground line together with the make contacts d1-1, d1-2, d1- of the relay D1. 3, the relay A <b> 1 is driven and the make contact a <b> 1-1 of the polarity matching switching unit 13 </ b> B is operated so that the polarity N is applied to the output side A line, and the make contact a <b> 2 is operated and the output side B is operated. Connect the polarity L to the wires.

  Subsequently, the power receiving unit 21B, that is, the electrode receiving property detecting unit 22B has a power receiving input having a polarity opposite to that described above, the polarity L is set to the A line, and the polarity N is set to the B line together with the ground line. , D2-2, and d2-3, the relay B2 is driven and the make contact b2-1 of the polarity matching switching unit 23B is operated to set the polarity L to the output B line and the make contact b2-2. Operates to connect the polarity N to the output A line.

  That is, even if there is a reverse connection in the power receiving unit on the input side, the polarity N is always connected to the A line on the output side, and the polarity L is connected to the B line on the output side.

  Thus, since the polarity can be detected and selected with respect to the ground level, this circuit configuration is effective in the case of a device having a functional unit whose performance depends on the polarity, such as an audio signal.

  Another embodiment of the present invention different from that described above will be described as a third embodiment with reference to FIG.

  FIG. 10 is an explanatory diagram showing a circuit of Embodiment 3 of the device of the present invention. The third embodiment is a case where the output after rectification of a DC power supply or a commercial power supply is received, and the relay circuit portion described above is configured by a bridge circuit using a diode. That is, the polarity reference follows the polarity of the diode.

  In other words, the power receiving circuits 1C and 2C show two input systems including the power receiving units 11C and 21C, the electrode receiving property detecting units 12C and 22C, and the polarity matching switching units 13C and 23C, respectively. The power receiving unit 11C and the power receiving unit 21C are single-phase three-wire systems having a ground wire, and the A line, the B line, and the ground wire are connected to the electrode receiving property detection units 12C and 22C, respectively. The electrode receiving property detection units 12C and 22C detect the polarity with a diode. The polarity matching switching units 13C and 23C bridge-connect the diodes of the electrode receiving property detection units 12C and 22C. The power feeding unit 30 is the same as the power feeding unit described above, but the output side A line is fixed to polarity “+” and the output side B line is fixed to polarity “−”. Therefore, the polarity “+” supplied on the input side is always supplied to the A line on the output side due to the polarity of the diode.

  Therefore, the above-described function can be formed at low cost by connecting the power feeding unit to a circuit after rectification in an electric and electronic device and enabling a plurality of DC power receptions.

  According to the present invention, a plurality of power receiving units for connecting a power source for power supply are provided, a polarity reference is determined in advance, two polarities of each input of the power receiving unit are compared with a polarity reference, and the polarity is detected. When the polarities of the output and the output are different, it is possible to easily stabilize the power supply output by automatically switching and connecting so that the polarity on the input side matches the polarity on the output side. Therefore, the power feeding device according to the present invention can output power without trouble by automatically switching the connection by matching the polarity even when other power receiving inputs have different polarity connections in a plurality of power receiving units. When power is supplied by any one power receiving input using a power source, the present invention can be applied to an application that enables uninterruptible power without providing a backup power source.

It is the functional block diagram which showed one Embodiment about the basic composition of the electric power feeder which has the automatic switching function by this invention. (Basic example) It is the functional block diagram which showed one Embodiment of the electric power feeder which has an automatic switching function by this invention. Example 1 It is the sequence chart which showed one procedure of implementation with respect to the operation | movement at the time of receiving power initially in FIG. Example 1 It is the flowchart which showed one procedure of implementation with respect to the operation | movement at the time of receiving electric power in the state already received in FIG. Example 1 It is the circuit diagram which showed one Embodiment by the relay circuit of the electric power feeder shown by FIG. Example 1 FIG. 6 is a circuit explanatory diagram showing an embodiment of an operation state when power is received in one power receiving circuit in FIG. 5. Example 1 In FIG. 6, it is circuit explanatory drawing which showed one Embodiment when a feed circuit will be in an operation state. Example 1 In FIG. 7, it is a circuit explanatory drawing which showed one Embodiment when an input is connected to the other power receiving circuit by reverse polarity. Example 1 It is circuit explanatory drawing which showed one Embodiment by the case where the polarity reference | standard of the electric power feeder which has an automatic switching function is made into a ground level, and the polarity of each input line is detected. (Example 2) It is circuit explanatory drawing which showed one Embodiment by the diode of the electric power feeder which has an automatic switching function. (Example 3) It is explanatory drawing which showed an example of the past.

Explanation of symbols

1, 1A, 1B, 1C, 2, 2A, 2B, 2C Power receiving circuit 3, 3A Power feeding circuit 11, 11A, 11B, 11C, 21, 21A, 21B, 21C Power receiving unit 12, 12A, 12B, 12C, 22, 22A , 22B, 22C Electrode receiving property detection unit 13, 13A, 13B, 13C, 23, 23A, 23B, 23C Polarity matching switching unit 30 Power supply unit 31A Output detection unit

Claims (1)

In a power supply device having an automatic switching function that automatically supplies power to an electric and electronic circuit without a power failure when switching between receiving power of a power source having polarity in two or three wires,
A plurality of power receiving circuits and one power feeding circuit that receives the output of the power receiving circuit and feeds and outputs the power to the electric and electronic circuit,
Each of the power receiving circuits is
A power receiving unit for receiving a power input having two polarities;
And the polar one polarity criteria, compared to the polarity reference when receiving the receiving input, while the forward settings when receiving the input of the same polarity, upon receipt of an input of different polarity Receiving electrode detection unit for sending each as a switching setting,
In the power receiving unit, the input line having polarity and the output of the power feeding circuit are connected to each other, and when receiving the order setting from the electrode receiving property detection unit, two wires between the input and output A sequential connection for matching, a switching connection for matching the polarities of the two wires between the input and output when receiving the switching setting, a polarity matching switching unit for performing each, and
The power feeding circuit includes an output detection unit that detects the polarity of this output when receiving an output from one of the power receiving circuits and sends an output detection signal to all the power receiving circuits as the polarity reference,
The power receiving polarity detection section, a first forward setting when receiving an input in the initial state with no output detection signal from the output detecting unit, an input state from the output detection section which receives the output detection signal compared to the polarity of the output detection signal when subjected to, while the forward settings when receiving the input of the same polarity, the setting as the switch settings when receiving the input of different polarity Notifying the polarity matching switching unit, one input terminal connected to each of the two input wires, and the other input terminal connected in common and two input detections each having two make contacts Consists of relays (A, B) ,
The output detection unit includes an output detection relay (D) connected between two output lines and having one make contact and the same number of break contacts as the power receiving circuit,
The polarity matching switching unit includes one make contact of each of the two input detection relays on one input line, and the other make contact of each of the two input detection relays on the other line and a break of the output detection relay. Connect each of the contacts, and
The other winding terminal commonly connected to the two input detection relays is connected to the make contact and break contact of the output detection relay, and one winding terminal of the output detection relay is one input of each of the power receiving circuits. One make contact of the detection relay and the other make contact of the other input detection relay, and the other winding terminal of the output detection relay is connected to the other make contact of one input detection relay of each of the power receiving circuits and A power supply device having an automatic switching function, wherein the power supply device is connected to the one make contact of the other input detection relay and the make contact of the output detection relay.

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