JP2014121149A - Dc power system, dc power supply apparatus, dc apparatus, power supply method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recognize and supply required voltage of a DC apparatus with a simple structure.SOLUTION: A DC power supply apparatus includes: a derived voltage search section for searching for derived voltage defined for deriving voltage required for driving a DC apparatus by instructing a power conversion section which can output DC power by changing voltage to be output to supply the DC power to the DC apparatus while changing voltage in accordance with a predetermined method; a required voltage derivation section for deriving the required voltage from the derived voltage specified by the derived voltage search section; and a required voltage designation section for instructing the power conversion section to supply the DC power of the required voltage derived by the required voltage derivation section to the DC apparatus. The DC apparatus includes a derived voltage cut section for allowing the voltage of the DC power supplied from the DC power supply apparatus up to the derived voltage or less, and cutting input of the DC power when the voltage of the DC power exceeds the derived voltage. This technology can be applied to a DC power system which supplies DC power through a DC bus.

Description

  The present disclosure relates to a DC power system, a DC power supply device, a DC device, a power supply method, and a program, and in particular, a DC power system that can recognize and supply a necessary voltage of a DC device with a simple mechanism. , A DC power supply device, a DC device, a power supply method, and a program.

  In recent years, DC power obtained by AC / DC (Alternating current / Direct current) conversion of AC power supplied through the power system, DC power generated by solar cells, DC power output from batteries, There has been proposed a DC power system for supplying to a device that requires DC power (hereinafter referred to as a DC device) via a bus. In such a DC power system, when the voltage of the DC power output from the power supply unit connected to the DC bus is different from the voltage necessary for driving the DC device (hereinafter referred to as the necessary voltage), the DC device A DC power supply device that converts and supplies a voltage so as to obtain the required voltage is used.

  For example, as illustrated in FIG. 1A, the DC power system 11 includes a DC power supply device 12 and a DC device 13, and DC power is supplied from the power supply unit 14 to the DC power supply device 12. In the DC power supply device 12, the power conversion unit 22 converts the DC power supplied from the power supply unit 14 via the power input unit 21 into the necessary voltage of the DC device 13, and the DC power passes through the power output unit 23. And supplied to the DC device 13. In the DC device 13, DC power supplied from the DC power supply device 12 is supplied to the main circuit unit 32 via the power input unit 31, and the DC device 13 is driven.

  When the power supply unit 14 supplies AC power, the power conversion unit 22 can AC / DC convert the AC power and convert the AC power into a necessary voltage of the DC device 13.

  Further, in the DC power system 11, the required DC power voltage may differ depending on the DC device 13, and therefore it may be necessary to supply a different voltage for each DC device 13. Moreover, the shape and polarity of a device (plug) for connection for each DC device 13 may be different.

  For example, as illustrated in FIG. 1B, the DC power system 11A includes DC devices 13-1 and 13-2 having different necessary voltages, and the DC power supply device 12A includes DC devices 13-1 and 13-. 2 DC power can be supplied at the required voltage. That is, the DC power supply device 12A is provided with a variable power conversion unit 22A and a necessary voltage specifying unit 25 including a rotary switch. And a user designates a required voltage with respect to the required voltage designation | designated part 25, and selects either the power output part 23-1 or 23-2 according to the shape and polarity of the plug of the direct current | flow apparatus 13. FIG. According to this selection, the DC power supply device 12A supplies the DC power of the necessary voltage of the DC device 13-1 to the DC device 13-1 via the power output unit 23-1, or via the power output unit 23-2. The DC power of the necessary voltage of the DC device 13-2 is supplied to the DC device 13-2.

  When the power supply unit 14 supplies AC power, the power conversion unit 22 can AC / DC convert the AC power and convert the AC power into a necessary voltage of the DC device 13. A universal AC adapter exists as the power supply device 12A.

  By the way, in the method in which the user designates the necessary voltage or selects the power output unit 23 as in the DC power supply device 12A, the user makes a mistake in the designation of the necessary voltage or notices the difference in the polarity of the plug. It is assumed that the selection of the power output unit 23 is wrong. In order to avoid such user mistakes, a mechanism is required in which the DC power supply device 12A recognizes the necessary voltages of the DC devices 13-1 and 13-2.

  For example, the DC power supply device 12 and the DC device 13 are connected by a communication wire different from the power wire, and the necessary voltage is supplied from the DC device 13 to the DC power supply device 12 using the communication wire. A mechanism for sending However, it may not be preferable to physically increase the wiring in this way.

  Thus, for example, Patent Document 1 discloses a mechanism for transmitting a necessary voltage from the DC device 13 to the DC power supply device 12 by superimposing it on the DC power using a power wiring.

JP 2009-151947 A

  However, in the mechanism disclosed in Patent Document 1, the DC device includes means for transmitting a signal by superimposing a signal on DC power, and the DC power supply device includes means for receiving a signal superimposed on DC power. It is necessary and the mechanism becomes complicated.

  This indication is made in view of such a situation, and enables it to recognize and supply the required voltage of DC equipment with a simple mechanism.

  A DC power system according to an aspect of the present disclosure is a DC power system including a DC device that requires DC power and a DC power supply device that supplies DC power to the DC device, and the DC power supply device includes: Instructing the power conversion unit that can output DC power by changing the output voltage to supply DC power to the DC device while changing the voltage according to a predetermined method, A derived voltage search unit for retrieving a derived voltage defined for deriving a necessary voltage necessary for driving; a necessary voltage deriving unit for deriving the necessary voltage from the derived voltage specified by the derived voltage search unit; A necessary voltage designating unit that instructs the power conversion unit to supply the direct current power of the necessary voltage derived by the necessary voltage deriving unit to the DC device, and Flow device, the voltage of the DC power supplied from the DC power supply device, allowing to below the derived voltage, having the derived voltage cutting unit for cutting the input of the DC power when it exceeds the derived voltage.

  A DC power supply device according to one aspect of the present disclosure is a DC power supply device that supplies DC power to a DC device that requires DC power, and can output DC power by changing an output voltage. The conversion unit is instructed to supply DC power to the DC device while changing the voltage according to a predetermined method, and a derived voltage defined for deriving a necessary voltage necessary for driving the DC device is obtained. A derived voltage search unit for searching, a necessary voltage deriving unit for deriving the necessary voltage from the derived voltage specified by the derived voltage searching unit, and the power conversion unit for the necessary voltage deriving unit A necessary voltage specifying unit that instructs to supply the DC power of the required voltage to the DC device, and in the DC device, the voltage of the DC power supplied from the DC power supply device is Allowed output to a voltage below the input of the DC power is disconnected when it exceeds the derived voltage.

  The DC device according to one aspect of the present disclosure is a DC device that requires DC power, and the DC power supply device that supplies DC power to the DC device changes the output voltage and outputs DC power. Defined to derive a necessary voltage for driving the DC device by instructing the power conversion unit capable of supplying DC power to the DC device while changing the voltage according to a predetermined method. Derived voltage search unit for searching for derived voltage; Necessary voltage derivation unit for deriving the necessary voltage from the derived voltage specified by the derived voltage search unit; Derived by the necessary voltage deriving unit for the power conversion unit And a necessary voltage designating unit for instructing to supply the direct current power of the necessary voltage to the direct current device, and the voltage of the direct current power supplied from the direct current power supply device is the derivation Allowed to under pressure or less, and a deriving voltage cutting unit for cutting the input of the DC power when it exceeds the derived voltage.

  A power supply method or program according to one aspect of the present disclosure includes a DC power system including a DC device that requires DC power and a DC power supply device that supplies DC power to the DC device, or the A program for causing a computer to execute processing in a DC power system, wherein the voltage is changed according to a predetermined method for a power conversion unit that can output DC power by changing the output voltage in the DC power supply device Instructing the DC device to supply DC power while searching for a derived voltage defined for deriving a necessary voltage necessary for driving the DC device, and determining the necessary voltage from the identified derived voltage. Deriving a voltage and instructing the power converter to supply the derived DC power of the necessary voltage to the DC device. Including a step, wherein in the DC device, the voltage of the DC power supplied from the DC power supply device is allowed to be equal to or lower than the derived voltage, and the input of the DC power is disconnected when the voltage exceeds the derived voltage. .

  In one aspect of the present disclosure, in the DC power supply device, the DC power is supplied to the DC device while changing the voltage according to a predetermined method with respect to the power converter that can output the DC power by changing the output voltage. Instructed to supply, the derived voltage defined to derive the necessary voltage for driving the DC equipment is searched, the necessary voltage is derived from the identified derived voltage, and derived to the power converter It is instructed to supply DC power of the required voltage to the DC equipment. In the DC device, the voltage of the DC power supplied from the DC power supply device is allowed to be equal to or lower than the derived voltage, and the input of the DC power is cut when the derived voltage is exceeded.

  According to one aspect of the present disclosure, a necessary voltage of a DC device can be recognized and supplied with a simple mechanism.

It is a figure explaining the conventional DC power system. It is a functional block diagram showing an example of composition of a 1st embodiment of a direct-current power system to which this art is applied. It is a structural block diagram which shows the structural example of the direct-current power system of FIG. It is a functional block diagram showing an example of composition of a 2nd embodiment of a direct-current power system to which this art is applied. It is a structural block diagram which shows the structural example of the direct-current power system of FIG. It is a structural block diagram which shows the modification of a direct-current power system. It is a figure explaining operation | movement of an electric power input part. It is a flowchart explaining the process which DC power supply equipment calculates | requires and supplies the required voltage of DC equipment. It is a figure which shows the display part which displays the required voltage output from an electric power output part. It is a figure which shows an electric power output part provided with the connection detection means which detects the connection of DC apparatus.

  Hereinafter, specific embodiments to which the present technology is applied will be described in detail with reference to the drawings.

  FIG. 2 is a functional block diagram illustrating a configuration example of the first embodiment of the DC power system to which the present technology is applied. In the present specification, the term “system” represents the entire apparatus including a plurality of apparatuses.

  In FIG. 2, the DC power system 41 includes a DC power supply device 42 and a DC device 43, and power is supplied from the power supply unit 44 to the DC power supply device 42. In the following description, a configuration example in which the power supply unit 44 supplies DC power will be described. However, in a configuration in which AC power is supplied from the power supply unit 44, the AC power is AC / DC in the DC power supply device 42. It is assumed that DC power is supplied to the DC device 43 after conversion.

  The DC power supply device 42 specifies a necessary voltage necessary for driving the DC device 43 and supplies the DC power of the necessary voltage to the DC device 43. For example, the DC power supply device 42 includes a power input unit 51, a power conversion unit 52, a power output unit 53, a derived voltage search function 54, a necessary voltage derivation function 55, and a necessary voltage designation function 56.

  The power input unit 51 includes a connector to which wiring for inputting the DC power supplied from the power supply unit 44 to the DC power supply device 42 is connected, and converts the DC power from the power supply unit 44 into power. To the unit 52.

  The power conversion unit 52 is a variable conversion unit that can change the voltage to be output. The power conversion unit 52 converts the DC power of a predetermined voltage input through the power input unit 51 into a derived voltage search function 54 or a necessary voltage designation function. The voltage is converted into a voltage designated by 56 and output.

  The power output unit 53 is configured to include a connector to which a wiring for supplying DC power output from the DC power supply device 42 to the DC device 43 is connected, and can be electrically connected to an external device. The DC power output from the unit 52 is supplied to the DC device 43 via the power output unit 53. The power output unit 53 can measure the current of the DC power supplied to the DC device 43, and when the DC power input is cut off in the DC device 43 as will be described later, the current stops. It detects by doing. Then, the power output unit 53 notifies the derived voltage search function 54 of the timing when the input of the DC power is cut off in the DC device 43.

  The derived voltage search function 54 changes the output voltage of the power converter 52, and based on the timing notified from the power output unit 53 that the DC power input has been cut off in the DC device 43, the derived voltage search function 54 It has a function of retrieving a derived voltage Vx defined to derive a voltage.

  The necessary voltage deriving function 55 is set with a deriving function f (Vx) for calculating the necessary voltage of the DC device 43, and the necessary voltage deriving function 55 is derived by the derived voltage Vx searched by the derived voltage searching function 54. Is substituted into the derivation function f (Vx), and the necessary voltage of the DC device 43 is derived.

  The necessary voltage designating function 56 has a function of designating the necessary voltage of the DC device 43 derived by the necessary voltage deriving function 55 to the power conversion unit 52. The necessary voltage designating function 56 designates the necessary voltage of the DC device 43 to the power conversion unit 52, whereby the DC power of the necessary voltage is output from the power conversion unit 52.

  The DC device 43 includes a power input unit 61, a main circuit unit 62, and a derived voltage cutting function 63, and operates with DC power of a necessary voltage that is uniquely determined by the specifications.

  The power input unit 61 can be connected to an external device. When DC power supplied from the DC power supply device 42 is input, the power input unit 61 supplies the DC power to the main circuit unit 62. Further, the power input unit 61 cuts the input of DC power in accordance with an instruction from the derived voltage cutting function 63.

  The main circuit unit 62 is driven by being supplied with DC power of a necessary voltage via the power input unit 61 and executes various processes for operating the DC device 43.

  The derived voltage disconnection function 63 allows the voltage input to the power input unit 61 to be less than or equal to the derived voltage Vx, and when the voltage input to the power input unit 61 exceeds the derived voltage Vx, It has a function of instructing to cut off the input of DC power.

  In this way, the DC power supply device 42 and the DC device 43 are configured. When the DC device 43 is connected to the DC power supply device 42, the DC power supply device 42 obtains and supplies the necessary voltage of the DC device 43. The DC device 43 can be driven by DC power of a necessary voltage.

  For example, when the DC device 43 is connected to the DC power supply device 42, in the DC power supply device 42, the derived voltage search function 54 increases the output voltage stepwise from 0 V to supply DC power to the DC device 43. The power conversion unit 52 is instructed to do so. As a result, the voltage of the DC power supplied from the DC power supply device 42 to the DC device 43 increases stepwise from 0V. When the voltage of the DC power input to the DC device 43 exceeds the derived voltage Vx, the derived voltage cutting function 63 causes the power input unit 61 to disconnect the input of DC power in the DC device 43.

  In response to this, in the DC power supply device 42, the power output unit 53 detects the disconnection of the input of DC power in the DC device 43 and notifies the derived voltage search function 54. Then, the derived voltage search function 54 specifies the voltage immediately before the input of DC power is disconnected as the derived voltage Vx, and notifies the necessary voltage deriving function 55 of the derived voltage Vx. In accordance with this, the necessary voltage derivation function 55 substitutes the notified derivation voltage Vx into the derivation function f (Vx) to derive the necessary voltage of the DC device 43 and notifies the necessary voltage designation function 56 of it. Then, the necessary voltage designation function 56 designates the notified necessary voltage of the DC device 43 to the power conversion unit 52.

  Thus, the DC power supply device 42 is configured, and can recognize the necessary voltage of the DC device 43 with a simpler mechanism and supply the DC power of the necessary voltage to the DC device 43. Further, in the configuration in which the user designates the necessary voltage, it is assumed that a DC current having a different voltage is supplied to the DC device 43 by mistake, but such an error occurs in the DC power supply device 42. This can be prevented and the direct current of the required voltage can be reliably supplied to the direct current device 43.

  Further, unlike the configuration disclosed in Patent Document 1 as described above, the DC power supply device 42 and the DC device 43 do not need to include means for performing communication by superimposing on DC power, so that the apparatus is complicated. Can be avoided. Thereby, the cost required for development and manufacture can be suppressed, and the spread of the DC power system 41 can be promoted.

  Patent Document 1 discloses a method of increasing the voltage stepwise from 0 V to the required voltage. In this method, DC power is supplied to a DC device by supplying DC power of an intermediate voltage. There is concern about malfunctions and failures. On the other hand, in the DC power system 41, a voltage range in which the necessary voltage and the derived voltage Vx do not overlap can be defined by appropriately setting the necessary voltage range and the derivation function f (Vx). As a result, after the voltage is raised to the derived voltage Vx sufficiently lower than the necessary voltage, the direct current power of the intermediate voltage is supplied to the direct current device 43 by outputting the direct current power of the necessary voltage. Is avoided. Therefore, it is possible to prevent a malfunction or failure of the DC device 43 from occurring. Further, by defining the necessary voltage range and the derived function f (Vx) in a range that does not overlap, it is possible to avoid misidentifying the high voltage range as the derived voltage Vx.

  As described above, in the DC power system 41, the configuration of the DC power supply device 42 and the DC device 43 is not greatly changed from the conventional one, with a very simple mechanism, and with a mechanism excellent in versatility and expansibility, It is possible to recognize the necessary voltage of the DC device 43 and supply DC power of the necessary voltage. Furthermore, customization such as improving accuracy and performance, reducing costs, and narrowing allowable voltage can be flexibly selected in accordance with product characteristics.

  Here, FIG. 3 shows a structural block diagram for realizing the DC power system 41 in the functional block shown in FIG. In the DC power system 41 shown in FIG. 3, the same reference numerals are given to the blocks common to the configuration shown in FIG. 2, and detailed description thereof is omitted.

  As illustrated in FIG. 3, the DC power supply device 42 includes a control unit 71 configured to include a CPU (Central Processing Unit), a memory, and the like. In the control unit 71, the CPU executes the program stored in the memory, thereby realizing the functions of the derived voltage search function 54, the necessary voltage derivation function 55, and the necessary voltage designation function 56.

  The power input unit 61 can be built in a power input device 45 added outside the DC device 43, and the power input unit 61 includes a power limiting circuit 72 that realizes a derived voltage disconnection function 63. Is done. In this way, the DC device 43 is connected to the power input device 45, and DC power is supplied from the DC power supply device 42 via the power input device 45.

  As described above, the DC power system 41 recognizes the necessary voltage of the DC device 43 with a simple configuration in which the power limiting circuit 72 is added and a simple algorithm executed by the control unit 71, and the DC power of the necessary voltage. Can be supplied to the DC device 43.

  Next, FIG. 4 is a functional block diagram illustrating a configuration example of the second embodiment of the DC power system to which the present technology is applied.

  In the DC power system 41 </ b> A shown in FIG. 4, blocks that are the same as those in the DC power system 41 of FIG. 2 are given the same reference numerals, and detailed descriptions thereof are omitted. That is, the DC power system 41A includes a DC power supply device 42 and a DC device 43A. The DC power supply device 42 is similar to the DC power supply device 42 of FIG. 2 in that the power input unit 51, the power conversion unit 52, the power output unit 53, the derived voltage search function 54, the necessary voltage derivation function 55, and the necessary A voltage specifying function 56 is provided.

  Further, the DC device 43 </ b> A includes a power input unit 61, a main circuit unit 62, and a derived voltage cutting function 63, similarly to the DC device 43 of FIG. 2. However, the DC device 43A is configured differently from the DC device 43 of FIG.

  The permissible voltage transmission function 64 allows the DC power to pass through the power input unit 61 only when the voltage of the DC power input to the power input unit 61 is a permissible voltage that allows the main circuit unit 62 to operate. Has a function of supplying the main circuit unit 62 with the above. Here, the allowable voltage is a voltage in a range that includes the necessary voltage of the DC device 43 and that is minimally allowable by the DC device 43. As will be described later with reference to FIG. The voltage in a predetermined range. For example, the allowable voltage is not determined in the specification of the DC device 43, but an allowable range may be specified as a design error, and the allowable voltage may be 0 V. In that case, the DC power supply device 42 (or The power conversion unit 52, the power output unit 53, and the derived voltage search function 54) must be highly accurate.

  Here, FIG. 5 shows a structural block diagram for realizing the DC power system 41A in the functional block shown in FIG. In the DC power system 41A shown in FIG. 5, the same reference numerals are given to the blocks common to the configurations shown in FIGS. 3 and 4, and the detailed description thereof is omitted.

  As shown in FIG. 5, in the DC power supply device 42, each function of a derived voltage search function 54, a necessary voltage derivation function 55, and a necessary voltage designation function 56 is realized in the control unit 71. The power input unit 61A can be built in a power input device 45A added outside the DC device 43. The power input unit 61A includes a power limiting circuit 72 that realizes a derived voltage disconnection function 63, and an allowable voltage. And a power limiting circuit 73 for realizing the transmission function 64. In this way, the DC device 43 is connected to the power input device 45, and DC power is supplied from the DC power supply device 42 via the power input device 45.

  In this way, the DC power system 41A recognizes the necessary voltage of the DC device 43 with a simple configuration in which the power limiting circuit 72 and the power limiting circuit 73 are added and a simple algorithm executed by the control unit 71. The DC power of the necessary voltage can be supplied to the DC device 43.

  The power input unit 61A may be built in the DC device 43. That is, as in a modification of the DC power system 41A shown in FIG. 6, the DC device 43 'of the DC power system 41A' can include the power input unit 61A and the main circuit unit 62.

  Further, when the allowable voltage of the DC device 43 is strictly set, it is necessary to derive the necessary voltage as reliably as possible. In such a case, instead of the power limiting circuit 72, software is used. By realizing the derived voltage disconnection function 63, it is possible to expect disconnection with an accurate derived voltage over a long period of time.

  Next, the operation of the power input unit 61A will be described with reference to FIG.

  As shown in FIG. 7, in the power input unit 61 </ b> A, the power limiting circuit 73 that realizes the power limiting circuit 72 is connected in series to the DC power supply device 42 and the main circuit unit 62 to realize the power limiting circuit 73. One end of the limit circuit 72 is connected to the wiring between the DC power supply device 42 and the power limit circuit 73, and the other end of the DC power supply device 42 is grounded.

  The power limiting circuit 72 realizes a derived voltage disconnection function 63, and in the example of FIG. 7, 2.0V is set as the derived voltage Vx. That is, the power limiting circuit 72 transmits DC power having a voltage from 0 V to 2.0 V, and cuts transmission of DC power when the voltage input to the power input unit 61 exceeds 2.0 V.

  The power limiting circuit 73 realizes a permissible voltage transmission function 64. In the example of FIG. 7, the necessary voltage of the DC device 43 is 10.0V, and the voltage allowed for the operation of the DC device 43A is 9.5V. Transmit DC power with a voltage from 1 to 10.5 V, and limit transmission of voltages outside this range.

  At this time, f (Vx) = Vx × 5 is set as the derivation function f (Vx) in the necessary voltage derivation function 55 of the DC power supply device 42, and the voltage of the DC power is derived by the power limiting circuit 72. When the disconnection is caused by exceeding Vx of 2.0V, the necessary voltage is derived to be 10.0V according to the derivation function f (Vx). As a result, when 10.0 V DC power is output from the DC power supply device 42, the DC power is supplied to the main circuit unit 62 through the power limiting circuit 73.

  At this time, even if a malfunction occurs and DC power having a voltage significantly different from the required voltage is output from the DC power supply device 42, the DC power is supplied to the main circuit unit 62. 73. As described above, the power input unit 61A includes the power limiting circuit 73, so that the DC power having a voltage greatly different from the required voltage is prevented from being supplied to the main circuit unit 62, and the DC power having such a voltage is used. Can be avoided from being malfunctioned or caused by being supplied to the main circuit unit 62.

  Next, a process in which the DC power supply device 42 obtains and supplies the necessary voltage of the DC device 43 will be described with reference to the flowchart of FIG.

  Here, an example will be described in which the derived voltage search function 54 uses a method of searching for the derived voltage Vx by gradually increasing the voltage output from the power conversion unit 52 in a certain step (hereinafter referred to as a fixed step method). . The necessary voltage of the DC device 43 is 10.0 V, the derived voltage Vx at which the derived voltage cutting function 63 cuts off the input of power is 2.0 V, and the necessary voltage deriving function 55 has f (Vx) as the derived function f (Vx). ) = Vx × 5 is set. In addition, the range of the required voltage of the DC device 43 is in the range of 5.0V to 24.0V, and the DC device 43 may operate with a voltage within this range.

  For example, when the connection of the DC device 43 is detected, in step S11, the derived voltage search function 54 instructs the power converter 52 to output DC power having a voltage of, for example, 1.0 V as an initial voltage. .

  In step S <b> 12, the derived voltage search function 54 determines whether or not the DC power input to the DC device 43 has been disconnected. For example, when the power output unit 53 notifies that the current output to the DC device 43 has stopped, the derived voltage search function 54 determines that the power input to the DC device 43 has been disconnected, and there is no notification. In this case, it is determined that the power input to the DC device 43 is not disconnected.

  If the derived voltage search function 54 determines in step S12 that the power input to the DC device 43 has not been disconnected, the process proceeds to step S13. In step S13, the derived voltage search function 54 specifies that the voltage of the DC power output to the power converter 52 is increased by 0.2 V, the process returns to step S12, and the same process is repeated thereafter.

  As described above, when the voltage of the DC power output from the power conversion unit 52 is increased by 0.2V and the voltage of the DC power output from the power output unit 53 exceeds 2.0V and becomes 2.2V, the DC device 43 The derived voltage cutting function 63 causes the power input unit 61 to cut the input of DC power. That is, the input of DC power is cut by the power limiting circuit 72 that implements the derived voltage cutting function 63. When the power output unit 53 detects that the current output to the DC device 43 has stopped and notifies the derived voltage search function 54, the derived voltage search function 54 is input to the DC device 43 in step S12. It is determined that the DC power has been disconnected, and the process proceeds to step S14.

  In step S <b> 14, the derived voltage search function 54 specifies the voltage immediately before the power supply is cut off, that is, 2.0 V as the derived voltage Vx, and notifies the necessary voltage derivation function 55.

  In step S15, the necessary voltage deriving function 55 substitutes the derived voltage Vx (= 2.0V) notified from the necessary voltage deriving function 55 in step S14 into the derived function f (Vx) = Vx × 5, and the necessary voltage is 10.0. V is derived and notified to the necessary voltage specifying function 56.

  In step S16, the necessary voltage designation function 56 designates the necessary voltage (= 10.0V) notified from the necessary voltage derivation function 55 in step S15 to the power conversion unit 52, and the process ends.

  As a result, the power conversion unit 52 outputs DC power having a voltage of 10.0V. In the DC device 43, the DC voltage having a voltage of 10.0V is transmitted through the power input unit 61 by the allowable voltage transmission function 64, and the required voltage The direct current is supplied to the main circuit unit 62, and the main circuit unit 62 can operate normally.

  The derived voltage search function 54 may search for the derived voltage Vx using a binary search method in addition to searching for the derived voltage Vx using the above-described constant step method. In the binary search method, a voltage that divides the voltage range including the derived voltage Vx into two is sequentially output from the power converter 52, and the derived voltage Vx is searched by narrowing the voltage range including the derived voltage Vx.

  For example, in the binary search method, the derived voltage search function 54 first outputs DC power at a derived voltage (2.9 V) for deriving 14.5 V, which is the middle of the required voltage range of 5 V to 24 V. It designates with respect to the power converter 52. Thereafter, the derived voltage search function 54 determines the output voltage according to the binary search method and designates it to the power converter 52, and determines the upper limit voltage at which the DC power input is not cut off as the derived voltage Vx in the DC device 43. can do. As described above, by using the binary search method, it is possible to reduce the number of times the power conversion unit 52 changes the voltage and outputs the voltage until the derived voltage Vx is identified, and the derived voltage Vx is identified at a higher speed. be able to.

  Furthermore, the derived voltage search function 54 can employ various search algorithms in addition to the fixed-step method and the binary search method. And the precision which pinpoints the derivation voltage Vx can be improved by using a several search algorithm together, or performing the same search algorithm in multiple times.

  In addition, the derived voltage search function 54 holds the necessary voltage of the DC device 43 that has supplied DC power in the past, and the DC that is currently connected as an object to supply DC power from these required voltages. A learning function for specifying a predetermined voltage when starting a search for a derived voltage with respect to the device 43 may be provided. Then, the derived voltage search function 54 can start searching for the derived voltage of the DC device 43 from a predetermined voltage specified by learning. For example, the derived voltage search function 54 may hold the necessary voltages of the DC devices 43 that have been connected until the previous time, and start the search algorithm with the average value of the necessary voltages as a predetermined voltage. . Alternatively, the derived voltage search function 54 sets the necessary voltage of the DC device 43 with the largest number of connections among the predetermined number of DC devices 43 connected most recently as a predetermined voltage as the first target, and performs a search algorithm. You may start.

  By the way, in a facility where the DC power system 41 is introduced, for example, it is assumed that the DC power supply device 42 is installed so as to be embedded in the wall of the facility. In this case, the terminal of the cable for supplying DC power to the DC device 43 is used so as to be inserted into the connector of the power output unit 53 arranged on the wall surface.

  For example, as shown in FIG. 9A, a power output unit 53 is provided on a panel 81 installed on a wall surface, like a general household outlet. FIG. 9 shows an example in which two power output units 53-1 and 53-2 are provided.

  Moreover, as shown to FIG. 9B, it outputs from the display part 82-1 which displays the required voltage output from the power output part 53-1, and the power output part 53-2 on the panel 81A installed in a wall surface. You may provide the display part 82-2 which displays the required voltage. As the display units 82-1 and 82-2, a device that does not need to consume power when holding display content is used. For example, electronic paper or display content holding liquid crystal is preferably used.

  By providing the display units 82-1 and 82-2 in this manner, the user can recognize the necessary voltage output from the power output units 53-1 and 53-2.

  Similar to the display units 82-1 and 82-2, a display unit for displaying the necessary voltage or the derived voltage of the DC device 43 is provided near the connector of the power input unit 61 arranged in the casing of the DC device 43. It may be provided. Thereby, the user can recognize the necessary voltage or derived voltage of the DC device 43.

  Further, for example, the power output unit 53 of the DC power supply device 42 can include a connection detection unit that detects the connection of the DC device 43.

  For example, as illustrated in FIG. 10, the power output unit 53 includes a connector 93, a switch 94, and an interlocking mechanism 95.

  The connector 93 is a concave connection part into which a terminal 92 of a cable 91 for supplying DC power to the DC device 43 can be inserted. The switch 94 detects the connection of the DC device 43 and is turned on when the DC device 43 is connected. When the switch 94 is in the OFF state, the output of the DC power by the power conversion unit 52 is stopped, and when the switch 94 transitions from the OFF state to the ON state, the DC power supply device 42 has the necessary voltage of the DC device 43. The process for obtaining and supplying the data (FIG. 8) is started. The interlocking mechanism 95 is a mechanism that turns on the switch 94 in conjunction with the insertion of the terminal 92 of the cable 91 into the connector 93.

  In the power output unit 53 configured as described above, as shown in FIG. 10A, when the terminal 92 of the cable 91 is disconnected from the connector 93, the interlocking mechanism 95 is housed inside the connector 93 and the switch 94 is turned off. It becomes. Thereby, the power output unit 53 determines that the DC device 43 is not connected, and the output of the DC power by the power conversion unit 52 is stopped.

  On the other hand, as shown in FIG. 10B, in a state where the terminal 92 of the cable 91 is inserted into the connector 93, the interlocking mechanism 95 is pushed out of the connector 93 and the switch 94 is turned on. As a result, the power output unit 53 determines that the DC device 43 is connected, the DC power supply device 42 performs processing for obtaining and supplying the necessary voltage of the DC device 43, and the DC conversion is performed from the power conversion unit 52. Electric power is output.

  As described above, the power output unit 53 includes the connection detection unit that detects the connection of the DC device 43, so that the DC power of the necessary voltage is reliably supplied to the DC device 43 only when the DC device 43 is connected. can do.

  Here, in the present embodiment, a linear function is used as the derivation function f (Vx). However, as long as the derivation function f (Vx) can be defined as a function, a function other than the linear function may be used. However, after the derivation function f (Vx) is determined by regulation, it is prohibited to change it in principle. In the derivation function f (Vx), the pitch for each 1V is widened in the high voltage region, whereas the pitch for each 1V can be narrowed in the low voltage region. As a result, the required voltage is 3.3V or 7.2V in the low voltage range, whereas the high voltage range is effective when a large number of products such as 16V or 19V occupy 1V pitch. Further, the derivation function f (Vx) may be determined based on electrical characteristics (technical restrictions). In the case of simple conversion using a linear function for the derived function f (Vx), the influence of the voltage drop can be eliminated.

  Note that the processes described with reference to the flowcharts described above do not necessarily have to be processed in chronological order in the order described in the flowcharts, but are performed in parallel or individually (for example, parallel processes or objects). Processing). The program may be processed by one CPU, or may be distributedly processed by a plurality of CPUs.

  Further, the above-described series of processing (information processing method) can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software executes various functions by installing a computer incorporated in dedicated hardware or various programs. The program is installed in a general-purpose computer capable of recording from a program recording medium on which the program is recorded.

  Note that the present embodiment is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present disclosure.

  41 DC power system, 42 DC power supply equipment, 43 DC equipment, 44 power supply section, 45 power input device, 51 power input section, 52 power conversion section, 53 power output section, 54 derived voltage search function, 55 necessary voltage derivation Function, 56 Required voltage specification function, 61 Power input section, 62 Main circuit section, 63 Derived voltage disconnection function, 64 Allowable voltage transmission function, 71 Control section, 72 Power limit circuit, 73 Power limit circuit, 81 Panel, 82 Display section , 91 cable, 92 terminals, 93 connector, 94 switch, 95 interlocking mechanism

Claims (15)

A DC power system comprising a DC device that requires DC power, and a DC power supply device that supplies DC power to the DC device,
The DC power supply device is
Instructing the power converter that can output DC power by changing the output voltage to instruct the DC equipment to supply DC power while changing the voltage according to a predetermined method, and driving the DC equipment A derived voltage search unit for retrieving a derived voltage defined to derive a necessary voltage required for
A necessary voltage deriving unit for deriving the necessary voltage from the derived voltage specified by the derived voltage searching unit;
A necessary voltage designating unit that instructs the power conversion unit to supply the DC equipment with the DC power of the necessary voltage derived by the necessary voltage deriving unit;
The DC device has a derived voltage cutting unit that allows a voltage of the DC power supplied from the DC power supply device to be equal to or less than the derived voltage and cuts an input of the DC power when the voltage exceeds the derived voltage. Power system. The DC device includes the necessary voltage in the range, and only when the DC device has an allowable voltage in a range that is allowed for operation, the DC device allows the DC power to pass through the main circuit portion of the DC device. The DC power system according to claim 1, further comprising a voltage transmission unit. A derivation function for deriving the necessary voltage is predefined,
The DC power system according to claim 1, wherein the necessary voltage deriving unit derives the necessary voltage by substituting the derived voltage specified by the derived voltage searching unit into the derived function. The derived voltage search unit searches for the derived voltage by changing the voltage output by the power conversion unit according to a constant step method of gradually increasing the voltage output by the power conversion unit at a fixed step. DC power system. The derived voltage search unit changes the voltage output by the power conversion unit according to a binary search method for sequentially outputting from the power conversion unit a voltage that divides the voltage range including the derived voltage from the power conversion unit. The DC power system according to claim 1, wherein the derived voltage is searched by narrowing a voltage range to be included. The derived voltage search unit holds the necessary voltage of the DC device to which DC power has been supplied in the past, and starts searching for the derived voltage from a predetermined voltage specified from the necessary voltage. The DC power system according to claim 1. The DC power system according to claim 1, wherein the DC power supply device further includes a display unit that displays the necessary voltage supplied to the DC device. The DC power supply device further includes a power output unit capable of conducting with an external device,
The DC power system according to claim 1, wherein the DC device further includes a power input unit capable of conducting with an external device. The DC power system according to claim 8, wherein the power output unit of the DC power supply device includes a detection unit that detects whether or not the DC device is connected. The DC power system according to claim 9, wherein when the detection unit detects that the DC device is connected, the derived voltage search unit is operated. The DC power system according to claim 9, wherein when the detection unit detects that the DC device is not connected, output of DC power from the power conversion unit is stopped. A DC power supply device that supplies DC power to a DC device that requires DC power,
Instructing the power converter that can output DC power by changing the output voltage to instruct the DC equipment to supply DC power while changing the voltage according to a predetermined method, and driving the DC equipment A derived voltage search unit for retrieving a derived voltage defined to derive a necessary voltage required for
A necessary voltage deriving unit for deriving the necessary voltage from the derived voltage specified by the derived voltage searching unit;
A required voltage designating unit that instructs the power conversion unit to supply the direct current power of the necessary voltage derived by the necessary voltage deriving unit to the DC device;
In the DC device, the DC power voltage supplied from the DC power supply device is allowed to be equal to or lower than the derived voltage, and the DC power input is cut off when the voltage exceeds the derived voltage. DC equipment that requires DC power,
The direct current power supply device that supplies direct current power to the direct current device changes the output voltage and outputs direct current to the power conversion unit that can output direct current power while changing the voltage according to a predetermined method. A derivation voltage search unit for instructing to supply power and searching for a derivation voltage defined to derive a necessary voltage for driving the DC device; and the derivation specified by the derivation voltage search unit A necessary voltage deriving unit for deriving the necessary voltage from a voltage, and a required voltage designation for instructing the power conversion unit to supply the DC power of the necessary voltage derived by the necessary voltage deriving unit to the DC device. And
A DC device comprising a derived voltage cutting unit that allows a voltage of DC power supplied from the DC power supply device to be equal to or less than the derived voltage and cuts an input of DC power when the voltage exceeds the derived voltage. A power supply method using a DC power system including a DC device that requires DC power and a DC power supply device that supplies DC power to the DC device,
In the DC power supply device,
Instructing the power converter that can output DC power by changing the output voltage to instruct the DC equipment to supply DC power while changing the voltage according to a predetermined method, and driving the DC equipment Search for the derived voltage defined to derive the required voltage required for
Deriving the required voltage from the identified derived voltage,
Instructing the power conversion unit to supply the direct current power of the derived necessary voltage to the direct current device,
The DC power supply method includes a step of allowing the voltage of the DC power supplied from the DC power supply device to be equal to or lower than the derived voltage and cutting off the input of the DC power when the voltage exceeds the derived voltage. A program that causes a computer to execute processing in a DC power system including a DC device that requires DC power and a DC power supply device that supplies DC power to the DC device,
In the DC power supply device,
Instructing the power converter that can output DC power by changing the output voltage to instruct the DC equipment to supply DC power while changing the voltage according to a predetermined method, and driving the DC equipment Search for the derived voltage defined to derive the required voltage required for
Deriving the required voltage from the identified derived voltage,
Instructing the power conversion unit to supply the direct current power of the derived necessary voltage to the direct current device,
In the DC device, the DC power voltage supplied from the DC power supply device is allowed to be equal to or lower than the derived voltage, and the DC power input is disconnected when the voltage exceeds the derived voltage. The program to be executed.

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