Switching Power Supply Unit

Abstract

To provide a switching power supply device capable of enhancing versatility in additional unitization of a compensation circuit at the time of momentary blackout and the like.SOLUTION: A switching power supply device having a boosting circuit includes a holding time extension unit connected to a first input terminal and a second input terminal of the boosting circuit. The holding time extension unit includes a charging converter, a capacitor element, and a first switch element. The charging converter includes a first converter terminal, a second converter terminal, and a third converter terminal. The first converter terminal and the third converter terminal are connected directly or via another circuit to the first input terminal and the second input terminal. The capacitor element is connected between the first converter terminal and the second converter terminal. The first switch element is connected between the second converter terminal and the second input terminal.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a switching power supply device. [Background technology]

[0002] Patent Document 1 describes an interleaved PFC (Power Factor Correction) converter that can extend the compensation time during a momentary power outage (see Patent Document 1). In the interleaved PFC converter described in Patent Document 1, a diode (diode Ds in FIG. 1 of Patent Document 1) and a switch (switch Ss in FIG. 1 of Patent Document 1) are added to a general interleaved PFC. In the interleaved PFC converter described in Patent Document 1, the switch is turned off during normal operation, and a first PFC (PFC1 in FIG. 1 of Patent Document 1) and a second PFC (PFC2 in FIG. 1 of Patent Document 1) perform boost operation, and during an instantaneous power outage, the boost operation of the first PFC is stopped and the switch is turned on to utilize the energy of a capacitor (capacitor Co1 in FIG. 1 of Patent Document 1) down to a low voltage. As a result, in the interleaved PFC converter described in Patent Document 1, the total capacitor capacity and volume are reduced, and the efficiency is improved by the interleaved operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2010 / 143453 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the circuit configuration described in Patent Document 1, no consideration has been given to forming an additional unit of the instantaneous power failure compensation circuit. If one were to consider making the circuit described in Patent Document 1 into an additional unit, there would be problems with versatility, such as low independence in controlling the additional unit and the need to unify the power capacity with the AC (Alternating Current) / DC (Direct Current) power source to which it is connected.

[0005] The present disclosure has been made in consideration of the above circumstances, and has an object to provide a switching power supply device that can increase the versatility of compensating circuits as additional units during momentary power outages, etc. [Means for solving the problem]

[0006] One aspect of the present disclosure provides a switching power supply device including a boost circuit, the holding time extension unit being connected to a first input terminal and a second input terminal of the boost circuit, the holding time extension unit including a charging converter, a capacitive element, and a first switch element, the charging converter having a first converter terminal, a second converter terminal, and a third converter terminal, the first converter terminal and the third converter terminal being connected to the first input terminal and the second input terminal directly or via another circuit, the capacitive element being connected between the first converter terminal and the second converter terminal, and the first switch element being connected between the second converter terminal and the second input terminal. , the hold time extension unit is connected to the first input terminal, the second input terminal and the third input terminal of the boost circuit, the hold time extension unit further includes a second switch element, the charging converter further includes a fourth converter terminal, the first converter terminal is connected to the first input terminal, the third converter terminal is connected to the second input terminal, the first switch element is connected between the second converter terminal and the third converter terminal, the fourth converter terminal is connected to the third input terminal, and the second switch element is connected between the second converter terminal and the fourth converter terminal; It is a switching power supply. One aspect of the present disclosure is a switching power supply device including a boost circuit, the holding time extension unit being connected to a first input terminal and a second input terminal of the boost circuit, the holding time extension unit including a charging converter, a capacitive element, and a first switch element, the charging converter having a first converter terminal, a second converter terminal, and a third converter terminal, the first converter terminal and the third converter terminal being connected to the first input terminal and the second input terminal directly or via another circuit, the capacitive element being connected between the first converter terminal and the second converter terminal, the first switch element being connected between the second converter terminal and the second input terminal, and the holding time extension unit further including a rectifier circuit inside or outside the holding time extension unit, the holding time extension unit further including a second switch element, the first converter terminal and the third converter terminal being connected to the boost circuit via the rectifier circuit, and the second switch element being connected between the first converter terminal and the first input terminal. One aspect of the present disclosure is a switching power supply device including a boost circuit, the holding time extension unit being connected to a first input terminal and a second input terminal of the boost circuit, the holding time extension unit including a charging converter, a capacitive element, and a first switch element, the charging converter having a first converter terminal, a second converter terminal, and a third converter terminal, the first converter terminal and the third converter terminal being connected to the first input terminal and the second input terminal directly or via another circuit, the capacitive element being connected between the first converter terminal and the second converter terminal, the first switch element being connected between the second converter terminal and the second input terminal, the boost circuit including a boost circuit switching element and a boost circuit switching element. a first input terminal connected to one end of the switching element for the boost circuit and a second input terminal connected to the other end of the switching element for the boost circuit; in a configuration in which there is one capacitive element, a voltage across the capacitive element is a first voltage; in a configuration in which a plurality of capacitive elements are connected in series, a voltage across the plurality of capacitive elements is the first voltage; in a configuration in which there is one capacitive element for the boost circuit, a voltage across the capacitive element for the boost circuit is a second voltage; and in a configuration in which a plurality of capacitive elements for the boost circuit are connected in series, a voltage across the plurality of capacitive elements for the boost circuit is the second voltage, the first voltage is set to a voltage lower than the second voltage. Effect of the Invention

[0007] According to the switching power supply device according to the present disclosure, it is possible to improve the versatility of the compensation circuit as an additional unit during momentary power outages and the like. [Brief description of the drawings]

[0008] [Figure 1] 1 is a diagram showing an example of a schematic circuit configuration of a switching power supply device according to an embodiment; [Diagram 2] 1 is a diagram showing an example of a schematic circuit configuration of a switching power supply device according to an embodiment; [Diagram 3] 1 is a diagram showing an example of a schematic circuit configuration of a switching power supply device according to an embodiment; [Figure 4] 1 is a diagram showing an example of a schematic circuit configuration of a switching power supply device according to an embodiment; [Diagram 5] FIG. 2 is a diagram showing an example of a specific circuit configuration of a switching power supply device according to an embodiment. [Figure 6] 5A and 5B are diagrams for explaining an example of the operation of the switching power supply device according to the embodiment. [Figure 7] 5A and 5B are diagrams for explaining an example of the operation of the switching power supply device according to the embodiment. [Figure 8] 5A and 5B are diagrams for explaining an example of the operation of the switching power supply device according to the embodiment. [Figure 9] 5A to 5C are waveform diagrams for explaining an example of the operation of the switching power supply device according to the embodiment. [Figure 10] 5A to 5C are diagrams illustrating an example of a specific circuit configuration of a hold time extension unit including a control circuit according to an embodiment. [Figure 11] 5 is a diagram showing an example of a waveform of a voltage detected by a detection unit according to the embodiment; FIG. [Figure 12] 5 is a diagram showing an example of a waveform of a voltage detected by a detection unit according to the embodiment; FIG. [Figure 13] FIG. 2 is a diagram showing an example of a specific circuit configuration of a switching power supply device according to an embodiment. [Figure 14] FIG. 2 is a diagram showing an example of a specific circuit configuration of a hold time extension unit in the switching power supply device according to the embodiment. [Figure 15] FIG. 2 is a diagram showing an example of a specific circuit configuration of a hold time extension unit in the switching power supply device according to the embodiment. [Figure 16] FIG. 2 is a diagram showing an example of a specific circuit configuration of a hold time extension unit in the switching power supply device according to the embodiment. [Figure 17] FIG. 2 is a diagram showing an example of a specific circuit configuration of a hold time extension unit in the switching power supply device according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, when a switch (switch element, switching element) is in an on state, it is considered to be in a conductive state, and when a switch (switch element, switching element) is in an off state, it is considered to be in an open state. In the following embodiments, the normal state refers to a state in which power is normally supplied from the power source to the boost circuit. On the other hand, in the following embodiment, when an instantaneous power outage or the like occurs, it is not a normal time (non-normal time). Here, the instantaneous power outage includes an instantaneous power outage (a momentary power outage) and a power outage. Similarly, in the following embodiment, the instantaneous power outage refers to a time when an instantaneous power outage occurs. Note that the instantaneous power outage does not necessarily have to be an absolute value of the power supply voltage of zero, and may include a case where the absolute value of the power supply voltage is equal to or less than a predetermined value.

[0010] (Schematic circuit configuration and schematic operation of switching power supply device) A schematic circuit configuration and schematic operation of a switching power supply device will be described with reference to FIGS. 1 to 4.

[0011] <Switching power supply device according to the example of FIG. 1> FIG. 1 is a diagram showing an example of a schematic circuit configuration of a switching power supply device 11 according to an embodiment. The switching power supply device 11 includes a boost circuit 31 having a PFC function and a hold time extension unit 32. In this embodiment, the boost circuit 31 corresponds to an AC / DC power supply to be compensated, and the hold time extension unit 32 corresponds to an additional unit that extends the hold time of the compensation target during an instantaneous power outage or the like.

[0012] The boost circuit 31 is connected to a power supply 111 . Here, the power supply 111 is, for example, a commercial AC power supply. The power supply 111 may experience momentary interruptions or the like.

[0013] The boost circuit 31 includes a diode bridge DB1 including four diodes 112 to 114, an inductor 116 including, for example, a coil, a switching element 117 including a MOS type FET (Field Effect Transistor), a diode 119, and a capacitance element 120.

[0014] For ease of explanation, in the boost circuit 31, the two terminals to which the hold time extension unit 32 is connected are referred to as the first input terminal T31 and the second input terminal T32, and the two terminals to which the load (not shown) is connected are referred to as the first output terminal T11 and the second output terminal T12.

[0015] The power supply 111 is connected to a first input terminal T31 and a second input terminal T32 via a diode bridge DB1 having a rectifying function. Specifically, the cathode of the diode 113 and the anode of the diode 112 are connected together. The cathode of the diode 115 and the anode of the diode 114 are connected together. The cathode of the diode 112 and the cathode of the diode 114 are connected to the second input terminal T32. The anode of the diode 113 and the anode of the diode 115 are connected to the first input terminal T31. A power supply 111 is connected between the point between diode 113 and diode 112 and the point between diode 115 and diode 114 .

[0016] The second input terminal T32 is connected to one end of the inductor 116. The other end of the inductor 116 is connected to the drain of the switching element 117 and the anode of the diode 119.

[0017] A series connection circuit of a switching element 117 and a diode 119 is connected in parallel to a capacitance element 120. Specifically, one end of the capacitance element 120 is connected to the source of the switching element 117, the first input terminal T31, and the first output terminal T11. The other end of the capacitance element 120 is connected to the cathode of the diode 119 and the second output terminal T12. In the example of FIG. 1, the capacitive element 120 is an electrolytic capacitor, and the other end of the capacitive element 120 is the positive side.

[0018] The holding time extension unit 32 includes a charging converter 211, a capacitance element section 231 including n (n is an integer of 1 or more) capacitance elements 231-1 to 231-n connected in series, and a first switch element 232. The charging converter 211 includes a battery management system (BMS) 212 that manages the capacitive element unit 231 . As another configuration example, the BMS 212 may be provided separately from the charging converter 211. Furthermore, the holding time extension unit 32 does not necessarily have to include the BMS 212.

[0019] For ease of explanation, in the hold time extension unit 32, the two terminals to which the boost circuit 31 is connected will be referred to as a first connection terminal P1 and a second connection terminal P2. The first connection terminal P1 and the second connection terminal P2 may be called charge / discharge terminals or the like. For ease of explanation, the four terminals of the charging converter 211 will be referred to as a first converter terminal Q1, a second converter terminal Q2, a third converter terminal Q3, and a fourth converter terminal Q4. The first converter terminal Q1, the second converter terminal Q2, the third converter terminal Q3, and the fourth converter terminal Q4 may be called output terminals, output terminals, charge / discharge terminals, control terminals, etc., respectively.

[0020] Here, the fourth converter terminal Q4 is a terminal that outputs a control signal to the first switch element 232. In the example of Fig. 1, the charging converter 211 includes a control circuit that controls the first switch element 232, but in another configuration example, the control circuit may be separate from the charging converter 211, and in this case, the fourth converter terminal Q4 for controlling the first switch element 232 is not provided.

[0021] In this embodiment, the first input terminal T31 of the boost circuit 31 and the first connection terminal P1 of the hold time extension unit 32 are negative terminals and connected to each other, and the second input terminal T32 of the boost circuit 31 and the second connection terminal P2 of the hold time extension unit 32 are positive terminals and connected to each other. Here, the first connection terminal P1 and the second connection terminal P2 are terminals for charging and discharging. The hold time extension unit 32 and the boost circuit 31 may be configured as separate units that are detachable from each other, or may be configured as an integrated unit. In this embodiment, the hold time extension unit 32 is configured as a separate unit from the boost circuit 31, and is an external unit to the boost circuit 31.

[0022] Here, FIG. 1 shows a diode 233 and a wiring 234 according to another configuration example. First, a case where the diode 233 and the wiring 234 are not provided will be described.

[0023] The first connection terminal P1 is connected to one end of the capacitive element section 231 and the first converter terminal Q1. The other end of the capacitive element section 231, a second converter terminal Q2, and one end of the first switch element 232 are connected. The second connection terminal P2, the third converter terminal Q3, and the other end of the first switch element 232 are connected together. In the example of FIG. 1, the capacitive elements 231-1 to 231-n are electrolytic capacitors, and the other end of the capacitive element portion 231 is the positive side.

[0024] A control circuit (here, it is assumed that the control circuit is included in the charging converter 211) controls the on / off of the first switch element 232 based on the input voltage.

[0025] Here, the diode 233 according to the other configuration example is an example of a rectifying element, and may be connected between the first switch element 232 and the second connection terminal P2. In this case, the anode of the diode 233 and the other end of the first switch element 232 are connected, and the cathode of the diode 233 and the second connection terminal P2 are connected. 1. That is, the other end of the first switch element 232 may be connected to a circuit (e.g., an inductor) inside the charging converter 211 instead of the second connection terminal P2. In this case, the other end of the first switch element 232 is connected to the second connection terminal P2 via the circuit (e.g., an inductor).

[0026] Here, the charging converter 211 is, for example, a switching mode converter (SWM Converter). As the switching mode converter, a general switching mode converter such as a SEPIC converter (Single Ended Primary Inductor Converter) is used. When a non-isolated converter is used as the switching mode converter, for example, a Buck, Boost, Buck-Boost, Zeta, SuperBuck, Half-Bridge, or other converter may be used. When an isolated converter is used as the switching mode converter, for example, a Flyback, SEPIC, Cuk, Push-Pull, Bridge, or other converter may be used.

[0027] The first switch element 232 is a switch that is turned on when a momentary power outage or the like is detected. For example, a semiconductor switch or a contact switch is used as the first switch element 232. For example, a thyristor may be used as the first switch element 232. If the first switch element 232 does not have a reverse blocking function, an inrush current will flow when the power is restored after a momentary power outage, and therefore, for example, a reverse blocking diode (for example, the diode 233 shown in FIG. 1) may be inserted as necessary.

[0028] The capacitive elements 231-1 to 231-n are used as energy buffers for compensation. As the capacitance elements 231-1 to 231-n, for example, an electrolytic capacitor, a battery, a series cell of a plurality of batteries, or an electric double layer capacitor (EDLC) may be used. In this embodiment, the capacitive elements 231-1 to 231-n have a function of storing electricity, and are charged by the charging converter 211.

[0029] The BMS212 includes a function of adjusting the voltage balance of the energy buffer when a battery or EDLC is used as the energy buffer. The BMS 212 is, for example, a voltage balancing circuit of any of various types, such as a resistor type or a converter type, and maintains the cell voltage balance of the capacitive element unit 231 .

[0030] An outline of the operation of the switching power supply device 11 will now be described. In the switching power supply device 11, in the normal state, the first switch element 232 is turned off, and the switching element included in the charging converter 211 is operated so as to be switched on / off, thereby causing the charging converter 211 to operate normally. This allows the capacitance element section 231 of the holding time extension unit 32 to be charged. On the other hand, in the switching power supply device 11, at the time of an instantaneous power outage, the first switch element 232 is turned on and the switching element included in the charging converter 211 is turned off and stopped from operating. This allows voltage to be supplied from the capacitive element section 231 of the holding time extension unit 32 to the boost circuit 31.

[0031] With this configuration, in the switching power supply device 11 according to this embodiment, even if a momentary power outage or the like occurs, the output of the switching power supply device 11 can be secured for a certain period of time. Therefore, in the switching power supply device 11 according to this embodiment, it is possible to improve the versatility of adding a compensation circuit (holding time extension unit 42 in the example of FIG. 1) for use during momentary power outages and the like.

[0032] For example, in order to compensate for momentary power interruptions in power systems, input electrolytic capacitors are used as energy buffers in AC / DC power supplies. However, with the recent trend toward smaller power supplies, the capacity of input electrolytic capacitors is on the decline, and the compensation time for momentary power interruptions is also on the decline. Therefore, in this embodiment, it is possible to provide an additional unit for an AC / DC power supply for the purpose of compensating for momentary power interruption, etc. The additional unit according to this embodiment (holding time extension unit 42 in the example of FIG. 1) has a higher energy utilization rate than, for example, a capacitor addition unit according to an existing method (a unit that simply adds a capacitor, capacitor addition unit 812 shown for reference in FIG. 13), and therefore the capacitance of the electrolytic capacitor can be reduced. Furthermore, the additional unit according to this embodiment can be applied to a configuration in which the inrush current prevention circuit is eliminated, or to a configuration in which an energy buffer such as a battery or EDLC is used.

[0033] In this way, in this embodiment, the capacity of the capacitor added to the PFC can be reduced in compensation for momentary power outages, etc., and a highly versatile additional unit can be provided. In addition, for example, based on the method according to this embodiment, it is also possible to apply it to a DC-UPS (Uninterruptible Power Supply) using LiB (Lithium-ion Battery) or EDLC, etc., which have a higher energy density.

[0034] <Switching power supply device according to the example of FIG. 2> 2 is a diagram showing an example of a schematic circuit configuration of a switching power supply device 12 according to an embodiment. The circuit configuration in the example of FIG. 2 is an application example of the circuit configuration in the example of FIG. The switching power supply device 12 includes a boost circuit 41 having a dual-boost type PFC function, and a hold time extension unit . In this embodiment, the boost circuit 41 corresponds to an AC / DC power supply to be compensated for, and the hold time extension unit 42 corresponds to an additional unit that extends the hold time of the compensation target during an instantaneous power outage or the like.

[0035] The boost circuit 41 is connected to a power supply 131. The power supply 131 is similar to the power supply 111 shown in FIG. The boost circuit 41 includes two diodes 132 and 133, two inductors 134 and 138 formed of, for example, coils, two switching elements 135 and 139 formed of MOS type FETs, two diodes 137 and 141, and a capacitance element 142.

[0036] For ease of explanation, in the boost circuit 41, the three terminals to which the hold time extension unit 42 is connected will be referred to as the first input terminal T331, the second input terminal T332, and the third input terminal T333, and the two terminals to which the load (not shown) is connected will be referred to as the first output terminal T311 and the second output terminal T312.

[0037] Regarding the configuration of the booster circuit 41, differences from the booster circuit 31 shown in FIG. 1 will be described, and detailed description of similarities will be omitted. A series-connected circuit of a switching element 135 and a diode 137 and a series-connected circuit of a switching element 139 and a diode 141 are connected in parallel to a capacitance element 142 connected between the first output terminal T311 and the second output terminal T312.

[0038] One end of the power supply 131 is connected to the drain of the switching element 139 and the anode of the diode 141 via an inductor 138 . The other end of the power supply 131 is connected to the drain of the switching element 135 and the anode of the diode 137 via the inductor 134 . 2, compared to the example of FIG. 1, the circuit portion having the switching elements 135 and 139, the diodes 137 and 141, and the inductors 134 and 138 with respect to the capacitive element 142 has two phases.

[0039] The anode of the diode 132 and the anode of the diode 133 are connected to the source of the switching element 139, the first input terminal T331, and the first output terminal T311. The cathode of the diode 132, the other end of the power supply 131, and the second input terminal T332 are connected. The cathode of the diode 133, one end of the power supply 131, and the third input terminal T333 are connected.

[0040] The holding time extension unit 42 includes a charging converter 311, a capacitance element section 331 including n (n is an integer of 1 or more) capacitance elements 331-1 to 331-n connected in series, a first switch element 332, and a second switch element 333. The charging converter 311 includes a battery management system (BMS) 312 that manages the capacitive element unit 331 . As another configuration example, the BMS 312 may be provided separately from the charging converter 311. Furthermore, the holding time extension unit 42 does not necessarily have to include the BMS 312.

[0041] For ease of explanation, in the hold time extension unit 42, the three terminals to which the boost circuit 41 is connected will be referred to as a first connection terminal P31, a second connection terminal P32, and a third connection terminal P33. The first connection terminal P31 and the second connection terminal P32 may be called charge / discharge terminals or the like. Also, for ease of explanation, the five terminals of charging converter 311 will be referred to as a first converter terminal Q31, a second converter terminal Q32, a third converter terminal Q33, a fourth converter terminal Q34, and a fifth converter terminal Q35. The first converter terminal Q31, the second converter terminal Q32, the third converter terminal Q33, the fourth converter terminal Q34, and the fifth converter terminal Q35 may each be called an output terminal, an output terminal, a charge / discharge terminal, a detection terminal, a control terminal, etc.

[0042] Here, the fifth converter terminal Q35 is a terminal that outputs a control signal to the first switch element 332 and the second switch element 333. Note that, in the example of Fig. 2, the charging converter 311 includes a control circuit that controls the first switch element 332 and the second switch element 333, but in another configuration example, the control circuit may be separate from the charging converter 311, and in this case, the fifth converter terminal Q35 for controlling the first switch element 332 and the second switch element 333 is not provided.

[0043] In this embodiment, the first input terminal T331 of the boost circuit 41 and the first connection terminal P31 of the hold time extension unit 42 are connected to each other as negative terminals, and the second input terminal T332 of the boost circuit 41 and the second connection terminal P32 of the hold time extension unit 42 are connected to each other as positive terminals. The third input terminal T333 of the boost circuit 41 and the third connection terminal P33 of the hold time extension unit 42 are terminals for voltage detection. Here, the first connection terminal P31 and the second connection terminal P32 are terminals for charging and discharging. The hold time extension unit 42 and the boost circuit 41 may be configured as separate units that are detachable from each other, or may be configured as an integrated unit. In this embodiment, the hold time extension unit 42 is configured as a separate unit from the boost circuit 41, and is an external unit to the boost circuit 41.

[0044] Here, FIG. 2 shows diodes 334, 335 and wirings 336, 338 according to another configuration example. First, a case where the diodes 334, 335 and the wirings 336, 338 are not provided will be described.

[0045] The first connection terminal P31, one end of the capacitive element section 331, and the first converter terminal Q31 are connected. The other end of the capacitive element section 331, a second converter terminal Q32, one end of the first switch element 332, and one end of the second switch element 333 are connected. The second connection terminal P32, the third converter terminal Q33, and the other end of the first switch element 332 are connected together. The third connection terminal P33, the fourth converter terminal Q34, and the other end of the second switch element 333 are connected together. In the example of FIG. 2, the capacitive elements 331-1 to 331-n are electrolytic capacitors, and the other end of the capacitive element portion 331 is the positive side.

[0046] A control circuit (here, it is assumed that the control circuit is included in charging converter 311) controls the on / off of first switch element 332 and second switch element 333 based on the input voltage.

[0047] Here, the diode 334 according to the other configuration example is an example of a rectifying element, and may be connected between the first switch element 332 and the second connection terminal P32. In this case, the anode of the diode 334 and the other end of the first switch element 332 are connected, and the cathode of the diode 334 and the second connection terminal P32 are connected. Moreover, the diode 335 according to another configuration example is an example of a rectifying element, and may be connected between the second switch element 333 and the third connection terminal P33. In this case, the anode of the diode 335 and the other end of the second switch element 333 are connected, and the cathode of the diode 335 and the third connection terminal P33 are connected.

[0048] Furthermore, a wiring 336 according to another configuration example may be provided in place of the wiring 337 shown in Fig. 2. That is, the other end of the first switch element 332 may be connected to a circuit (e.g., an inductor) inside the charging converter 311 in place of the second connection terminal P32. In this case, the other end of the first switch element 332 is connected to the second connection terminal P32 via the circuit (e.g., an inductor). Similarly to the first switch element 332, the second switch element 333 may also be connected to the third connection terminal P33 via a circuit (eg, an inductor) inside the charging converter 311.

[0049] Specific examples of charging converter 311, switch elements (first switch element 332 and second switch element 333), capacitance elements 331-1 to 331-n, and BMS 312 are similar to those in the example of FIG.

[0050] 2. In other words, one end of the second switch element 333 may be connected to the other end of the first switch element 332 instead of one end of the first switch element 332.

[0051] An overview of the operation of the switching power supply device 12 will now be described. In the switching power supply device 12, in the normal state, the first switch element 332 and the second switch element 333 are turned off, and the switching elements included in the charging converter 311 are operated so as to be switched on / off, so that the charging converter 311 is operated normally. This allows the capacitance element section 331 of the holding time extension unit 42 to be charged. On the other hand, in the switching power supply device 12, at the time of an instantaneous power interruption or the like, the first switch element 332 and the second switch element 333 are turned on, and the switching element included in the charging converter 311 is turned off and the operation is stopped. This allows voltage to be supplied from the capacitive element section 331 of the holding time extension unit 42 to the boost circuit 41. Here, the first switch element 332 and the second switch element 333 are turned on / off simultaneously.

[0052] With this configuration, in the switching power supply device 12 according to this embodiment, even if a momentary power outage occurs, for example, the output of the switching power supply device 12 can be secured for a certain period of time. Therefore, in the switching power supply device 12 according to this embodiment, it is possible to improve the versatility of adding a compensation circuit (holding time extension unit 42 in the example of FIG. 2) for use during momentary power outages or the like. Incidentally, the switching power supply device 12 according to the example in FIG. 2 also provides the same effects as the switching power supply device 11 according to the example in FIG. 1, except that the switching power supply device 11 according to the example in FIG.

[0053] The switching power supply device 12 according to this embodiment includes a second switch element 333, which is an additional switch for compensating for momentary power outages and the like in a two-phase boost circuit. In addition, in the switching power supply device 12 according to this embodiment, the input from the third connection terminal P33 to the hold time extension unit 42 (fourth converter terminal Q34) is intended for high-speed detection of momentary power outages and the like and for charging by the two-phase converter. In the switching power supply device 12 according to this embodiment, it is possible to control the driving of one or both of the first switch element 332 and the second switch element 333 based on the detection result of the voltage of the third connection terminal P33.

[0054] In this embodiment, the additional unit is connected to the input of the PFC converter. Here, when there is one switch (in this embodiment, the first switch element 332 is provided and the second switch element 333 is not provided), only the PFC converter of one phase performs the boost operation, but it is considered that it is practically acceptable even if the loss is concentrated in one phase for a short compensation time. However, for long-term compensation, it is preferable to disperse the loss by adding another switch (in this embodiment, the configuration includes both the first switch element 332 and the second switch element 333) and performing the boost operation in two phases. In this way, in this embodiment, the input voltages of both phases are input to the additional unit, making it possible to quickly detect momentary interruptions, etc. Furthermore, in this embodiment, by using a two-phase SWM Converter that charges a compensatory energy buffer with the input voltages of both phases, it is possible to improve the input current imbalance during the charging period.

[0055] <Switching power supply device according to the example of FIG. 3> 3 is a diagram showing an example of a schematic circuit configuration of a switching power supply device 13 according to an embodiment. The circuit configuration in the example of FIG. 3 is an application example of the circuit configuration in the example of FIG. The switching power supply device 13 includes a boost circuit 51 having a totem-pole type PFC function, and a hold time extension unit 52. In this embodiment, the boost circuit 51 corresponds to an AC / DC power supply to be compensated, and the hold time extension unit 52 corresponds to an additional unit that extends the hold time of the compensation target during an instantaneous power outage or the like.

[0056] The boost circuit 51 is connected to a power supply 151. The power supply 151 is similar to the power supply 111 shown in FIG. The boost circuit 51 includes an inductor 152 formed of, for example, a coil, two switching elements 153 and 155 formed of MOS type FETs, two diodes 157 and 158, and a capacitance element 159.

[0057] For ease of explanation, in the boost circuit 51, the three terminals to which the hold time extension unit 52 is connected will be referred to as the first input terminal T431, the second input terminal T432, and the third input terminal T433, and the two terminals to which the load (not shown) is connected will be referred to as the first output terminal T411 and the second output terminal T412.

[0058] Between the first output terminal T411 and the second output terminal T412, a capacitance element 159, a series connection circuit of diodes 157 and 158, and a series connection circuit of switching elements 153 and 155 are connected in parallel.

[0059] One end of the power supply 151 is connected to the cathode of the diode 157 and the anode of the diode 158 . The other end of the power supply 151 is connected to one end of the inductor 152 . The other end of the inductor 152 is connected to the drain of the switching element 153 and the source of the switching element 155.

[0060] The first input terminal T431, the source of the switching element 153, the anode of the diode 157, one end of the capacitance element 159, and the first output terminal T411 are connected. The drain of the switching element 155, the cathode of the diode 158, the other end of the capacitance element 159, and a second output terminal T412 are connected together. The other end of the power supply 151 is connected to a second input terminal T432. One end of the power supply 151 is connected to the third input terminal T433.

[0061] Holding time extension unit 52 includes a charging converter 411, a capacitance element section 431 consisting of n (n is an integer equal to or greater than 1) capacitance elements 431-1 to 431-n connected in series, a first switch element 432, and a voltage detection section 451 that detects a voltage. The charging converter 411 includes a battery management system (BMS) 412 that manages the capacitive element unit 431 . As another configuration example, the BMS 412 may be provided separately from the charging converter 411. Furthermore, the holding time extension unit 52 does not necessarily have to include the BMS 412.

[0062] For ease of explanation, in the hold time extension unit 52, the three terminals to which the boost circuit 51 is connected will be referred to as a first connection terminal P41, a second connection terminal P42, and a third connection terminal P43. The first connection terminal P41 and the second connection terminal P42 may be called charge / discharge terminals or the like. Also, for ease of explanation, the five terminals of charging converter 411 will be referred to as a first converter terminal Q41, a second converter terminal Q42, a third converter terminal Q43, a fourth converter terminal Q44, and a fifth converter terminal Q45. The first converter terminal Q41, the second converter terminal Q42, the third converter terminal Q43, the fourth converter terminal Q44, and the fifth converter terminal Q45 may each be called an output terminal, an output terminal, a charge / discharge terminal, an input terminal, a control terminal, etc.

[0063] Here, fifth converter terminal Q45 is a terminal that outputs a control signal to first switch element 432. Note that, although the example in Fig. 3 shows a case where charging converter 411 includes a control circuit that controls first switch element 432, in another configuration example, the control circuit may be separate from charging converter 411, in which case fifth converter terminal Q45 for controlling first switch element 432 is not provided. Furthermore, the fourth converter terminal Q44 is a terminal for inputting a control signal (for example, a voltage) from the voltage detection unit 451. Therefore, as another configuration example, when the control circuit is separate from the charging converter 411, the fourth converter terminal Q44 does not need to be provided. Here, the control signal may be, for example, a control signal for controlling the first switch element 432, or a control signal for controlling the charging converter 411, or both of these.

[0064] In this embodiment, the first input terminal T431 of the boost circuit 51 and the first connection terminal P41 of the hold time extension unit 52 serve as negative terminals and are connected to each other, and the second input terminal T432 of the boost circuit 51 and the second connection terminal P42 of the hold time extension unit 52 serve as positive terminals and are connected to each other. The third input terminal T433 of the boost circuit 51 and the third connection terminal P43 of the hold time extension unit 52 serve as terminals for voltage detection. Here, the first connection terminal P41 and the second connection terminal P42 are terminals for charging and discharging. The hold time extension unit 52 and the boost circuit 51 may be configured as separate units that are detachable from each other, or may be configured as an integrated unit. In this embodiment, the hold time extension unit 52 is configured as a separate unit from the boost circuit 51, and is an external unit to the boost circuit 51.

[0065] Here, FIG. 3 shows a diode 433 according to another configuration example. First, a case where the diode 433 is not provided will be described.

[0066] The first connection terminal P41, one end of the capacitive element portion 431, and the first converter terminal Q41 are connected. The other end of the capacitive element section 431, the second converter terminal Q42, and one end of the first switch element 432 are connected. The third connection terminal P43 connected to the third input terminal T433 and a first terminal (terminal for voltage detection) of the voltage detection section 451 are connected. The second connection terminal P42 connected to the second input terminal T432, the third converter terminal Q43, the other end of the first switch element 432, and a second terminal (terminal for voltage detection) of the voltage detection unit 451 are connected. The third terminal of the voltage detection unit 451 and the fourth converter terminal Q44 are connected. In the example of FIG. 3, the capacitive elements 431-1 to 431-n are electrolytic capacitors, and the other end of the capacitive element portion 431 is the positive side.

[0067] Voltage detection unit 451 detects the voltage at the first terminal and the voltage at the second terminal, and outputs a voltage based on these detection results from a third terminal to a control circuit (here, the control circuit is assumed to be included in charging converter 411). The control circuit controls the on / off of the first switch element 432 based on the voltage input from the voltage detection unit 451.

[0068] Here, the diode 433 according to the other configuration example is an example of a rectifying element, and may be connected between the first switch element 432 and the second connection terminal P42. In this case, the anode of the diode 433 and the other end of the first switch element 432 are connected, and the cathode of the diode 433 and the second connection terminal P42 are connected.

[0069] Specific examples of charging converter 411, first switch element 432, capacitance elements 431-1 to 431-n, and BMS 412 are similar to those in the example of FIG.

[0070] An outline of the operation of the switching power supply device 13 will now be described. In the switching power supply device 13, in the normal state, the first switch element 432 is turned off, and the switching element included in the charging converter 411 is operated so as to be switched on / off, thereby causing the charging converter 411 to operate normally. This allows the capacitance element section 431 of the holding time extension unit 52 to be charged. On the other hand, in the switching power supply device 13, at the time of an instantaneous power outage, the first switch element 432 is turned on and the switching element included in the charging converter 411 is turned off to stop the operation. This allows voltage to be supplied from the capacitive element part 431 of the holding time extension unit 52 to the boost circuit 51.

[0071] With this configuration, in the switching power supply device 13 according to this embodiment, even if a momentary power outage or the like occurs, the output of the switching power supply device 13 can be secured for a certain period of time. Therefore, in the switching power supply device 13 according to this embodiment, it is possible to improve the versatility of adding a compensation circuit (holding time extension unit 52 in the example of FIG. 3) for use during momentary power outages and the like. Incidentally, the switching power supply device 13 according to the example in FIG. 3 also provides the same effects as the switching power supply device 11 according to the example in FIG. 1, except that the switching power supply device 11 according to the example in FIG.

[0072] Furthermore, in the switching power supply device 13 according to this embodiment, the input from the third connection terminal P43 to the hold time extension unit 52 is aimed at high-speed detection of an instantaneous power interruption or the like. Specifically, when only the first connection terminal P41 corresponding to the - terminal and the second connection terminal P42 corresponding to the + terminal shown in FIG. 3 are used, only the + terminal side can detect momentary power outages, etc., so in this embodiment, it is possible to quickly detect momentary power outages, etc. by using another location (the third connection terminal P43 in the example of FIG. 3).

[0073] In this embodiment, in the totem-pole PFC, the charging operation of the additional unit increases the input current for a half cycle and decreases it for a half cycle. Therefore, if the charging capacity is large, the positive / negative imbalance of the input current may become significant. In addition, it is considered desirable to quickly detect momentary interruptions and the like from the input voltages of both phases (L phase, N phase). When the charging power is larger than the input power of the connected AC / DC power source, there is a possibility that operational interference may occur. In addition, in the example of FIG. 3, the offset of the input power supply is included. In view of these circumstances, the configuration in FIG. 4 is considered to be more preferable than the configuration in FIG.

[0074] <Switching power supply device according to the example of FIG. 4> Fig. 4 is a diagram showing an example of a schematic circuit configuration of a switching power supply device 14 according to an embodiment. The circuit configuration in the example of Fig. 4 is an application example of the circuit configuration in the example of Fig. 1 (and the circuit configuration in the example of Fig. 3). The switching power supply device 14 includes a boost circuit 61 having a totem-pole type PFC function, a hold time extension unit 62, and a diode bridge 63 including four diodes 551 to 554. The diode bridge 63 is an example of a rectifier circuit. In this embodiment, the boost circuit 61 corresponds to an AC / DC power supply to be compensated for, and the hold time extension unit 62 corresponds to an additional unit that extends the hold time of the compensation target during an instantaneous power outage or the like. 4 shows a case where the hold time extension unit 62 and the diode bridge 63 are separate, the hold time extension unit 62 and the diode bridge 63 may be regarded as being integrated, that is, the hold time extension unit 62 may include the diode bridge 63. In this manner, the diode bridge 63 may be regarded as being provided inside the hold time extension unit 62, or may be regarded as being provided outside the hold time extension unit 62.

[0075] The boost circuit 61 is connected to a power supply 171. The power supply 171 is similar to the power supply 111 shown in FIG. The boost circuit 61 includes an inductor 172 formed of, for example, a coil, two switching elements 173 and 175 formed of MOS type FETs, two diodes 177 and 178, and a capacitance element 179.

[0076] For ease of explanation, in the boost circuit 61, the two terminals to which the hold time extension unit 62 is connected via the diode bridge 63 will be referred to as the first input terminal T531 and the second input terminal T532, and the two terminals to which the load (not shown) is connected will be referred to as the first output terminal T511 and the second output terminal T512.

[0077] Regarding the configuration of the booster circuit 61, differences from the booster circuit 51 shown in FIG. 3 will be described, and detailed description of similarities will be omitted. The configuration of the boost circuit 61 differs from that of the boost circuit 51 shown in FIG. 3 in that while the boost circuit 51 shown in FIG. 3 has a first input terminal T431, a second input terminal T432, and a third input terminal T433, the boost circuit 61 has a first input terminal T531 and a second input terminal T532, but is otherwise similar.

[0078] Here, the first input terminal T531 is connected to one end of the power supply 171, the cathode of the diode 177, and the anode of the diode 178. The second input terminal T532 is connected to the other end of the power supply 171 and one end of the inductor 172.

[0079] In the diode bridge 63, the cathode of the diode 552 and the anode of the diode 551 are connected, and the cathode of the diode 554 and the anode of the diode 553 are connected.

[0080] The holding time extension unit 62 includes a charging converter 511, a capacitance element section 531 consisting of a series connection of n (n is an integer equal to or greater than 1) capacitance elements 531-1 to 531-n, a first switch element 532, and a non-interference switch element 536 which is a second switch element. The charging converter 511 includes a battery management system (BMS) 512 that manages the capacitive element unit 531 . As another configuration example, the BMS 512 may be provided separately from the charging converter 511. Furthermore, the holding time extension unit 62 does not necessarily have to include the BMS 512.

[0081] For ease of explanation, the four terminals of the hold time extension unit 62 to which the diode bridge 63 and the boost circuit 61 are connected will be referred to as the first connection terminal P51, the second connection terminal P52, the third connection terminal P53, and the fourth connection terminal P54. The first connection terminal P51 and the second connection terminal P52 may be called charge / discharge terminals or the like. Also, for ease of explanation, the five terminals of charging converter 511 will be referred to as a first converter terminal Q51, a second converter terminal Q52, a third converter terminal Q53, a fourth converter terminal Q54, and a fifth converter terminal Q55. The first converter terminal Q51, the second converter terminal Q52, the third converter terminal Q53, the fourth converter terminal Q54, and the fifth converter terminal Q55 may each be called an output terminal, an output terminal, a charge / discharge terminal, a control terminal, or a control terminal. Here, the fourth converter terminal Q54 is a terminal that outputs a control signal to the first switch element 532. Moreover, the fifth converter terminal Q55 is a terminal that outputs a control signal to the non-interference switch element 536. Note that, in the example of FIG. 4, the charging converter 511 includes a control circuit that controls the first switch element 532 and the non-interference switch element 536, but in another configuration example, the control circuit may be separate from the charging converter 511, and in this case, the fourth converter terminal Q54 for controlling the first switch element 532 and the fifth converter terminal Q55 for controlling the non-interference switch element 536 are not provided.

[0082] In the example of FIG. 4, the first input terminal T531 and the second input terminal T532 of the boost circuit 61 are connected to the first connection terminal P51 and the second connection terminal P52 of the hold time extension unit 62 via a diode bridge 63. The first connection terminals P51 of the hold time extension units 62 serve as negative terminals and are connected to each other, and the second connection terminals P52 of the hold time extension units 62 serve as positive terminals and are connected to each other. Further, the first input terminal T531 of the boost circuit 61 and the third connection terminal P53 of the hold time extension unit 62 become a terminal equivalent to a - terminal (-' terminal) and are connected to each other. Further, the second input terminal T532 of the boost circuit 61 and the fourth connection terminal P54 of the hold time extension unit 62 become a terminal equivalent to a + terminal (+' terminal) and are connected to each other. Here, the first connection terminal P51 and the second connection terminal P52 are terminals for charging and discharging. The hold time extension unit 62 and the boost circuit 61 may be configured as separate units that are detachable from each other, or may be configured as an integrated unit. In this embodiment, the hold time extension unit 62 is configured as a separate unit from the boost circuit 61, and is an external unit to the boost circuit 61.

[0083] In addition, in a configuration in which the hold time extension unit 62 does not include the diode bridge 63, the hold time extension unit 62 and the diode bridge 63 may be configured to be detachable. In addition, in a configuration in which the hold time extension unit 62 includes a diode bridge 63, for example, the terminal at the point connected to the first input terminal T531 of the boost circuit 61 becomes the first connection terminal of the hold time extension unit 62, and the terminal at the point connected to the second input terminal T532 of the boost circuit 61 becomes the second connection terminal of the hold time extension unit 62.

[0084] Here, FIG. 4 shows a diode 533 according to another configuration example. First, a case where the diode 533 is not provided will be described.

[0085] The first connection terminal P51, one end of the capacitive element section 531, the first converter terminal Q51, and one end of the non-interference switch element 536 are connected to each other. The third connection terminal P53 and the other end of the non-interference switch element 536 are connected. The other end of the capacitive element section 531, the second converter terminal Q52, and one end of the first switch element 532 are connected. The fourth connection terminal P54 and the other end of the first switch element 532 are connected to each other. The second connection terminal P52 and the third converter terminal Q53 are connected to each other. In the example of FIG. 4, the capacitive elements 531-1 to 531-n are electrolytic capacitors, and the other end of the capacitive element portion 531 is the + side.

[0086] A control circuit (here, it is assumed that the control circuit is included in charging converter 511) controls the on / off of first switch element 532 based on the input voltage.

[0087] Here, the diode 533 according to the other configuration example is an example of a rectifying element, and may be connected between the first switch element 532 and the fourth connection terminal P54. In this case, the anode of the diode 533 and the other end of the first switch element 532 are connected, and the cathode of the diode 533 and the fourth connection terminal P54 are connected.

[0088] Specific examples of charging converter 511, first switch element 532, capacitance elements 531-1 to 531-n, and BMS 512 are similar to those in the example of FIG.

[0089] An outline of the operation of the switching power supply device 14 will now be described. In the switching power supply device 14, in the normal state, the first switch element 532 and the non-interference switch element 536 are turned off, and the switching elements included in the charging converter 511 are operated so as to be switched on / off, so that the charging converter 511 is normally operated. This allows the capacitance element section 531 of the holding time extension unit 62 to be charged. On the other hand, in the switching power supply device 14, at the time of an instantaneous power failure or the like, the first switch element 532 and the non-interference switch element 536 are turned on, and the switching element included in the charging converter 511 is turned off and stopped from operating. This allows voltage to be supplied from the capacitive element part 531 of the holding time extension unit 62 to the boost circuit 61. Here, the first switch element 532 and the non-interference switch element 536 are turned on / off simultaneously.

[0090] With this configuration, in the switching power supply device 14 according to this embodiment, even if a momentary power outage or the like occurs, the output of the switching power supply device 14 can be secured for a certain period of time. Therefore, in the switching power supply device 14 according to this embodiment, it is possible to improve the versatility of adding a compensation circuit (holding time extension unit 62 in the example of FIG. 4) for use during momentary power outages and the like. Incidentally, the switching power supply device 14 according to the example in FIG. 4 also provides the same effects as the switching power supply device 11 according to the example in FIG. 1, except that the switching power supply device 11 according to the example in FIG.

[0091] In this embodiment, by providing the diode bridge 63 and the non-interference switch element 536, a non-interference totem-pole type PFC is realized. In this embodiment, measures are taken against interference operation compared to the configuration example in Fig. 3, and the addition of diode bridge 63 enables the additional unit to perform independent charging operation. When compensating for a momentary power outage or the like, the same effect as in the configuration example in Fig. 3 can be obtained by turning on first switch element 532 and non-interference switch element 536. Here, in the example in Fig. 4, the reverse blocking function of non-interference switch element 536 is performed by diodes 177 and 178 of the connected AC / DC power supply. In the example of FIG. 4, the offset of the input power supply can be removed.

[0092] (Specific configuration and operation examples of a switching power supply device) Specific configuration and operation examples of the switching power supply device will be described with reference to FIGS.

[0093] FIG. 5 is a diagram showing an example of a specific circuit configuration of a switching power supply device 601 according to an embodiment. The switching power supply device 601 includes a boost circuit 31 having a PFC function, and a hold time extension unit 611. In this embodiment, the boost circuit 31 corresponds to an AC / DC power supply to be compensated, and the hold time extension unit 611 corresponds to an additional unit that extends the hold time of the compensation target during an instantaneous power outage or the like. It should be noted that the control circuit is omitted in FIG.

[0094] The boost circuit 31 is connected to a power supply 111 . Here, in the example of FIG. 5, the boost circuit 31 and the power supply 111 are similar to those shown in FIG. 1, and are denoted by the same reference numerals.

[0095] The hold time extension unit 611 includes an inductor 631 formed of, for example, a coil, a switching element 632 formed of a MOS type FET, a capacitance element 634, an inductor 635 formed of, for example, a coil, a diode 636, a first switch element 637, and a capacitance element section 638. Here, in the hold time extension unit 611, an inductor 631, a switching element 632, a capacitance element 634, an inductor 635, and a diode 636 are used to configure a charging converter. In the example of FIG. 5, the capacitive element section 638 is formed of one capacitive element, but the capacitive element section 638 may be formed using a plurality of capacitive elements.

[0096] For convenience of explanation, in the hold time extension unit 611, the two terminals to which the boost circuit 31 is connected will be referred to as a first connection terminal P61 and a second connection terminal P62. In this embodiment, the first input terminal T31 of the boost circuit 31 and the first connection terminal P61 of the hold time extension unit 611 are negative terminals and connected to each other, and the second input terminal T32 of the boost circuit 31 and the second connection terminal P62 of the hold time extension unit 611 are positive terminals and connected to each other.

[0097] Here, FIG. 5 shows wiring 639 according to another configuration example. First, a case where the wiring 639 is not provided will be described.

[0098] The source of the switching element 632, one end of the inductor 635, one end of the capacitive element portion 638, and a first connection terminal P61 are connected to each other. The other end of the inductor 635, one end of the capacitance element 634, and the anode of the diode 636 are connected. One end of the first switch element 637, the other end of the capacitive element portion 638, and the cathode of the diode 636 are connected. One end of the inductor 631, the drain of the switching element 632, the other end of the capacitance element 634, and the other end of the first switch element 637 are connected. The other end of the inductor 631 is connected to the second connection terminal P62. In the example of FIG. 5, the capacitive element section 638 is configured using an electrolytic capacitor, and the other end of the capacitive element section 638 is the + side.

[0099] Here, a wiring 639 according to another configuration example may be provided instead of the wiring 640 shown in Fig. 5. In other words, the other end of the first switch element 637 may be connected to the other end of the inductor 631 instead of one end of the inductor 631.

[0100] In the switching power supply device 601 according to this embodiment, for example, the capacitance of the capacitor is reduced, and the inrush current prevention circuit is eliminated by using a SEPIC converter, and the loss of the limiting resistor generated therein is eliminated. In the example of Fig. 5, in the SEPIC converter, the capacitance element 634 made of a capacitor serves as a DC cut capacitor. Also, the inductor 631 and the inductor 635 may be magnetically coupled to be an integrated component. Furthermore, in the switching power supply device 601, it is possible to set an arbitrary compensation capacitor voltage that is equal to or lower than the voltage of the input capacitor of the connected AC / DC power supply, regardless of the system voltage. Also, in the switching power supply device 601, it is not necessary to unify the power capacity of the charging converter with the connected AC / DC power supply, and it is possible to arbitrarily design the power capacity to be capable of charging the energy buffer in a desired charging time. Due to these effects, the switching power supply device 601 improves the versatility as an additional unit. In the switching power supply device 601 according to this embodiment, the first switch element 637 has a rated current equivalent to the input current of the AC / DC power supply to be connected, but it is only necessary to allow for conduction loss during the backup period, and an expensive high-speed switching element or heat sink is not necessarily required.

[0101] When both ends of the first switch element 637 are connected between the positive electrode of the compensation capacitor (the other end of the capacitive element unit 638 in the example of FIG. 5) and one end of the inductor 631 (the left side when viewed from the front in FIG. 5), there is a possibility that the current saturation point of the inductor 631 will be exceeded, but it is possible to limit the current rise by current control with the PFC inductor 116 which is the connected AC / DC power supply. For such current limitation, it is desirable to set the voltage of the compensation capacitor of the additional unit to be equal to or lower than the PFC boost voltage of the connected AC / DC power supply, and a voltage adjustment volume resistor or the like may be provided to improve the versatility of the additional unit.

[0102] Note that by employing the wiring 639 instead of the wiring 640, the connection point of the other end of the first switch element 637 may be the other end of the inductor 631 (the right side when viewed from the front in FIG. 5 ). In such a connection, the effect of suppressing the current increase when the first switch element 637 is on decreases. On the other hand, when the wiring 640 is used and the connection point of the other end of the first switch element 637 is the other end of the inductor 631 (the left side when viewed from the front in FIG. 5), the upper limit of the boost ratio is lowered due to the resistance component of the inductor 631, and the utilization rate of the capacitor energy becomes slightly lower.

[0103] Furthermore, the charging converter of the additional unit is not limited to a SEPIC converter, but may be replaced by a step-down converter such as a Zeta converter or a Buck converter. Also, for example, a conventional boost converter may be used, with an inrush current prevention circuit.

[0104] 6, 7, and 8 are diagrams for explaining an example of the operation of the switching power supply device 601 according to the embodiment. 6 to 8 show an example in which a wiring 639 is provided instead of the wiring 640 in the switching power supply device 601 shown in FIG. Moreover, in FIGS. 6 to 8, the control circuit is not shown. Here, an operation example of the switching power supply device 601 will be shown, taking the circuit configurations shown in FIGS. 6 to 8 as examples.

[0105] 6 shows a diode 641 according to another configuration example. The diode 641 may or may not be included in the hold time extension unit 611. When the diode 641 is included, the cathode of the diode 641 and one end of the first switch element 637 are connected, and the anode of the diode 641, the cathode of the diode 636, and the other end of the capacitive element section 638 are connected.

[0106] 6 and 7, a description will be given of normal operation when power supply 111 supplies a normal voltage. In normal operation, the first switch element 637 is maintained in an off state. In addition, in normal operation, the holding time extension unit 611 controls the switching element 632 of the charging converter to be switched on / off, so that the charging converter operates normally, power is supplied to the capacitive element unit 638, and the capacitive element unit 638 is charged (or the charge is held).

[0107] FIG. 6 shows an example of the configuration of a switching power supply device 601, and also shows with arrows the flow of current in the hold time extension unit 611 when the switching element 632 of the charging converter of the hold time extension unit 611 is on.

[0108] As shown by the arrows in Figure 6, in the hold time extension unit 611, a current flows from the second connection terminal P62 via the inductor 631 and switching element 632 to the first connection terminal P61, and a current flows from the inductor 635 via the capacitive element 634 and switching element 632 to the first connection terminal P61.

[0109] FIG. 7 shows an example configuration of a switching power supply device 601 similar to that shown in FIG. 6, and also shows with arrows the flow of current in the hold time extension unit 611 when the switching element 632 of the charging converter of the hold time extension unit 611 is off.

[0110] As indicated by the arrows in FIG. 7, in the hold time extension unit 611, a current flows from the second connection terminal P62 through the inductor 631, the capacitance element 634, the diode 636, and the capacitance element section 638 toward the first connection terminal P61. 6 and 7, power is supplied to the capacitive element section 638, and the capacitive element section 638 is charged (or held charged).

[0111] With reference to FIG. 8, an operation at the time of an instantaneous power outage or the like occurring in power supply 111 will be described. During an instantaneous power outage, the first switch element 637 is maintained in an on state. During an instantaneous power outage, the switching element 632 of the charging converter of the holding time extension unit 611 is maintained in an off state, so that the charging converter is stopped and the capacitance element section 638 is discharged. At this time, power is supplied from the capacitance element section 638 to the PFC converter (in the example of Figs. 6 to 8, the boost circuit 31), and the PFC converter (in the example of Figs. 6 to 8, the boost circuit 31) can perform normal boost operation.

[0112] FIG. 8 shows an example of the configuration of a switching power supply device 601 similar to that shown in FIG. 6, and also shows the flow of current in a hold time extension unit 611 by arrows.

[0113] 8, in the hold time extension unit 611, a current is generated that flows from the first connection terminal P61 to the second connection terminal P62 via the capacitive element portion 638 and the first switch element 637. When the diode 641 is provided, a current also flows through the diode 641. The current flow shown in FIG. 8 causes the capacitance element section 638 to discharge, enabling the boost circuit 31 to perform a normal boost operation.

[0114] FIG. 9 is a waveform diagram for explaining an example of the operation of the switching power supply device 601 according to the embodiment. The waveforms shown in FIG. 9 correspond to the operation of the switching power supply device 601 shown in FIGS.

[0115] In the graph shown in FIG. 9, the horizontal axis represents time and the vertical axis represents voltage level. In FIG. 9, the horizontal axis indicates time from time t0 to time t3. FIG. 9 shows a waveform 3011 of the AC voltage output from the power supply 111, a waveform 3012 of the voltage applied across the capacitive element 120 of the boost circuit 31 (the output voltage of the boost circuit 31), and a waveform 3013 of the voltage applied across the capacitive element section 638 of the hold time extension unit 611.

[0116] In the example of Fig. 9, the period from time t0 to time t1 is a normal period, during which AC voltage is normally supplied from the power supply 111. As a result, the voltage across the capacitive element section 638 of the hold time extension unit 611 is held in a fully charged state. Also, the voltage across the capacitive element 120 of the boost circuit 31 is held. Here, this example shows a case in which the voltage across the capacitive element section 638 of the hold time extension unit 611 and the voltage across the capacitive element 120 of the boost circuit 31 are the same during normal times.

[0117] The period from time t1 to time t2 is a period during which an instantaneous power outage or the like occurs and continues, and the supply of AC voltage from the power supply 111 is stopped. As a result, the voltage across the capacitive element section 638 of the hold time extension unit 611 drops due to discharge, and the voltage across the capacitive element 120 of the boost circuit 31 is held by the power of this discharge.

[0118] The period from time t2 to time t3 is normal (in this example, the period returning to normal from an instantaneous power outage, etc.), and AC voltage is normally supplied again from the power source 111. As a result, the voltage across the capacitive element section 638 of the hold time extension unit 611 increases (recovers) due to charging. Also, the voltage across the capacitive element 120 of the boost circuit 31 is held.

[0119] At time t3, the charging of the capacitive element unit 638 is completed, and the voltage across the capacitive element unit 638 reaches a fully charged state. The period after time t3 (in this example, the period after charging of the capacitive element unit 638 is completed) is a normal period, during which AC voltage is normally supplied from the power supply 111. As a result, the voltage across the capacitive element unit 638 of the hold time extension unit 611 is held in a fully charged state. Also, the voltage across the capacitive element 120 of the boost circuit 31 is held.

[0120] Here, first switch element 637 may be connected to either of the two ends of inductor 631. Similar operations are achieved not only in the circuit configurations shown in Figures 6 to 8 but also in the circuit configuration shown in Figure 5. In addition, by using a small-capacity SEPIC as an external Boost, for example, it is possible to eliminate the need for an inrush current prevention circuit.

[0121] In this embodiment, for example, only the first switch element 637 needs to be equivalent to a power circuit. The on control of the first switch element 637 and the boost stop control of the charging converter may be started by, for example, an AC Fail signal. After that, when the voltage (Vin) of the power supply 111 becomes higher than a predetermined voltage (Vcap), the off control of the first switch element 637 and the re-boost control of the charging converter after a predetermined time delay may be performed.

[0122] In the conventional or (RCD + switch) method, the withstand voltage of the electrolytic capacitor of the external module depends on the voltage of the bulk capacitor of the power supply body. In contrast, in the examples of Figures 5 to 8, the external module (additional unit) is not affected by the step-up / step-down operation of the SEPIC, making the additional unit highly versatile. 5 to 8, the backup sequence can be implemented with only two connection points for the connection points of the additional unit. If the target is a dual boost type PFC or a totem pole type PFC as shown in FIG. 2, the number of connection points for the connection points of the additional unit will be three.

[0123] The configuration of the switching power supply device 601 according to this embodiment can be considered as a type of bidirectional converter. When a capacitor is used as a capacitive element (in the example of Figures 5 to 8, the capacitive element constituting the capacitive element section 638), in this embodiment, with regard to the size / capacity of the capacitor, it is possible to reduce the size by utilizing the energy of the capacitor down to low voltages. In addition, in this embodiment, the limiting resistor can be eliminated. For example, in this embodiment, the limiting resistor is replaced with a converter, thereby reducing losses. Regarding external unitization, in this embodiment, it is possible to independently implement the voltage or circuit control of the capacitor.

[0124] Although the concept of a momentary power interruption compensation unit (UPS) using a charging converter is a known technology, in the conventional technology, a charging / discharging converter with the same power capacity as the compensation target (AC / DC power supply) was sometimes required as the momentary power interruption compensation unit. In contrast to such conventional technology, in this embodiment, a PFC converter of the compensation target (AC / DC power supply) connected to a switch (first switch element 637 in the example of Figs. 5 to 8) is used as a discharging converter, thereby reducing the discharging converter of the additional unit (holding time extension unit 611 in the example of Figs. 5 to 8) and improving the versatility of the additional unit.

[0125] Here, the examples in Figures 5 to 8 are operational examples relating to a specific configuration example of switching power supply device 11 shown in Figure 1, but similar operations are possible in switching power supply device 12 shown in Figure 2, switching power supply device 13 shown in Figure 3, or switching power supply device 14 shown in Figure 4.

[0126] (Specific configuration example of a control circuit of a switching power supply device) 10 to 12, a configuration example and an operation example of a control circuit of a switching power supply device will be described.

[0127] 10A, 10B, and 10C are diagrams showing an example of a specific circuit configuration of a hold time extension unit 701 including a control circuit 752 according to the embodiment. The holding time extension unit 701 includes a charging converter 711, a capacitance element section 731 consisting of n (n is an integer equal to or greater than 1) capacitance elements 731-1 to 731-n connected in series, a first switch element 732, a voltage detection section 751, and a control circuit 752. The charging converter 711 is equipped with a battery management system (BMS) 712. As another configuration example, the BMS 712 may be provided separately from the charging converter 711. Furthermore, the holding time extension unit 701 does not necessarily have to include the BMS 712.

[0128] For ease of explanation, in the case where the configuration of FIG. 1 or the configuration of FIG. 4 is applied, the two terminals of the hold time extension unit 701 to which the boost circuit (not shown in FIG. 10(A)) is connected will be referred to as the first connection terminal P71 and the second connection terminal P72. Also, for ease of explanation, in the case where the configuration of FIG. 2 or the configuration of FIG. 3 is applied, in the hold time extension unit 701, the three terminals to which the boost circuit (not shown in FIG. 10(A)) is connected will be referred to as the first connection terminal P71, the second connection terminal P72, and the third connection terminal P73. Also, for ease of explanation, the four terminals of charging converter 711 will be referred to as a first converter terminal Q71, a second converter terminal Q72, a third converter terminal Q73, and a fourth converter terminal Q74. Also, for ease of explanation, the six terminals in the control circuit 752 will be referred to as a first controller terminal R71, a second controller terminal R72, a third controller terminal R73, a fourth controller terminal R74, a fifth controller terminal R75, and a sixth controller terminal R76.

[0129] Here, FIG. 10A shows a diode 733 and a wiring 734 according to another configuration example. First, a case where the diode 733 and the wiring 734 are not provided will be described.

[0130] The first connection terminal P71 is connected to one end of the capacitive element section 731, the first converter terminal Q71, and the first controller terminal R71. The other end of the capacitive element section 731, a second converter terminal Q72, one end of the first switch element 732, and a second controller terminal R72 are connected. The second connection terminal P72, the third converter terminal Q73, and the other end of the first switch element 732 are connected together. The first input terminal of voltage detection unit 751 and the third converter terminal Q73 are connected. The second input terminal of the voltage detection unit 751 is connected to the third connection terminal P73. When the third connection terminal P73 is not used (when applied to the configuration of FIG. 1 or the configuration of FIG. 4), the second input terminal of the voltage detection unit 751 is unnecessary (for example, unconnected). The third controller terminal R73 and the output terminal of the voltage detection unit 751 are connected. The fourth controller terminal R74 is connected to a circuit section 791 that is capable of inputting (detecting) the current flowing through the first converter terminal Q71. The fifth controller terminal R75 and the fourth converter terminal Q74 are connected. The sixth controller terminal R76 is a terminal for outputting a control signal to the first switch element 732.

[0131] In the example of FIG. 10(A), in the control circuit 752, for example, the potential (voltage) of the first controller terminal R71 is used as a reference to determine the potential (voltage) of the other terminals. In the example of FIG. 10(A), the capacitive elements 731-1 to 731-n are electrolytic capacitors, and the other end of the capacitive element portion 731 is the + side.

[0132] Here, the diode 733 according to another configuration example may be connected between the first switch element 732 and the second connection terminal P72. In this case, the anode of the diode 733 and the other end of the first switch element 732 are connected, and the cathode of the diode 733 and the second connection terminal P72 are connected. 10A. That is, the other end of the first switch element 732 may be connected to a circuit (e.g., an inductor) inside the charging converter 711 instead of the second connection terminal P72. In this case, the other end of the first switch element 732 is connected to the second connection terminal P72 via the circuit (e.g., an inductor).

[0133] Here, when the configuration of FIG. 10A is applied to the configuration of FIG. 2 or the configuration of FIG. 3, the circuit configuration of a voltage detection unit 751a shown in FIG. The voltage detection unit 751a includes two diodes 771 and 772. These constitute a diode OR circuit. The anode of diode 771 connected to the first input terminal of voltage detection unit 751a is connected to third converter terminal Q73. The anode of the diode 772 connected to the second input terminal of the voltage detection section 751a is connected to the third connection terminal P73. The cathode of the diode 771 and the cathode of the diode 772 are connected to the output terminal of the voltage detection unit 751a.

[0134] Furthermore, when the configuration of FIG. 10(A) is applied to the configuration of FIG. 1 or the configuration of FIG. 4, the third connection terminal P73 is not provided, and the circuit configuration of the voltage detection unit 751b shown in FIG. 10(C) is used as the voltage detection unit 751. A first input terminal of the voltage detection unit 751b is connected to the third converter terminal Q73, so that the voltage of the third converter terminal Q73 becomes the voltage of the third controller terminal R73.

[0135] In this way, when it is sufficient to detect only the voltage of the second connection terminal P72, which is the positive terminal (when applied to the configuration of Figure 1 or the configuration of Figure 4), nothing needs to be connected to the third connection terminal P73 on the boost circuit side. On the other hand, when it is desirable to detect not only the voltage at the second connection terminal P72, which is the positive terminal, but also the voltage at the third connection terminal P73 (when applied to the configuration of Figure 2 or the configuration of Figure 3), the part to be detected as the voltage is to be detected is connected to the third connection terminal P73 on the boost circuit side.

[0136] The control circuit 752 may be configured using, for example, a general PFC control integrated circuit (IC). The control circuit 752 determines whether or not an instantaneous power interruption or the like has occurred based on the voltage input from the voltage detection unit 751, thereby detecting an instantaneous power interruption or the like. The control circuit 752 determines to execute control of the charging mode when no momentary power outage or the like is detected (i.e., under normal circumstances), and determines and sets to execute operation in the discharging mode when a momentary power outage or the like is detected. In this embodiment, the normal mode corresponds to the charge mode, and the mode during an instantaneous power interruption corresponds to the discharge mode.

[0137] The control circuit 752 controls the charging converter 711 and the first switch element 732 according to the mode that is set between the charging mode and the discharging mode. The control circuit 752 generates a PWM (Pulse Width Modulation) duty waveform for the charging converter 711, and supplies the generated duty waveform to the charging converter 711 from the third controller terminal R75 via the fourth converter terminal Q74. The control circuit 752 has a function of controlling the voltage (Vbuffer) of the second controller terminal R72 to a desired voltage. However, during the charging period until the desired voltage is reached, the control circuit 752 has a function of controlling the current flowing through the first converter terminal Q71 to a desired current according to the charging converter power capacity. The control of the current may include control of overcurrent protection.

[0138] The control circuit 752 normally sets the charging mode, outputs a duty waveform to the charging converter 711, and controls a control signal (for example, a voltage) from the sixth controller terminal R76 so as to turn off the first switch element 732. When an instantaneous power outage occurs, the control circuit 752 sets the discharge mode so as not to output a duty waveform to the charging converter 711, and controls the control signal (e.g., voltage) from the sixth controller terminal R76 to turn on the first switch element 732.

[0139] Here, the control circuit 752 sets the charging mode when it detects that the AC power supply to the compensation target has been turned on, or that the supply of the AC power supply has been restored after the occurrence of a momentary interruption or the like of the AC power supply. On the other hand, when the control circuit 752 detects a momentary interruption or the like, it sets the discharging mode. In addition, the control circuit 752 may determine that the supply of AC power has been restored, for example, when the voltage (Vbuffer) at the second controller terminal R72 becomes higher than the voltage (Vac) at the third controller terminal R73 after a momentary power outage or the like occurs, or another determination method may be used.

[0140] In the control circuit 752, it is possible to detect a momentary power outage or the like based on the voltage (Vac) of the third controller terminal R73.

[0141] When a control configuration such as the control circuit 752 according to the example of Figures 10(A) and 10(C) is applied to the holding time extension unit 32 in the switching power supply device 11 shown in Figure 1, switching between the charge mode and the discharge mode is controlled based on the voltage of the third converter terminal Q3 and the voltage of the first converter terminal Q1. Specifically, the voltage of the third converter terminal Q3 shown in Figure 1 corresponds to the voltage of the second connection terminal P72 (the voltage of the third converter terminal Q73) shown in Figure 10(A), and the voltage of the first converter terminal Q1 shown in Figure 1 corresponds to the voltage of the first connection terminal P71 shown in Figure 10(A). When a control configuration such as the control circuit 752 according to the example of Figures 10(A) and 10(C) is applied to the holding time extension unit 62 in the switching power supply device 14 shown in Figure 4, switching between the charge mode and the discharge mode is controlled based on the voltage at the third converter terminal Q53 and the voltage at the first converter terminal Q51. Specifically, the voltage at the third converter terminal Q53 shown in Figure 4 corresponds to the voltage at the second connection terminal P72 (the voltage at the third converter terminal Q73) shown in Figure 10(A), and the voltage at the first converter terminal Q51 shown in Figure 4 corresponds to the voltage at the first connection terminal P71 shown in Figure 10(A). When a control configuration such as the control circuit 752 according to the example of Figures 10(A) and 10(B) is applied to the holding time extension unit 42 in the switching power supply device 12 shown in Figure 2, switching between the charge mode and the discharge mode is controlled based on the voltage of the third converter terminal Q33, the voltage of the first converter terminal Q31, and the voltage of the fourth converter terminal Q34. Specifically, the voltage of the third converter terminal Q33 shown in Figure 2 corresponds to the voltage of the second connection terminal P72 (the voltage of the third converter terminal Q73) shown in Figure 10(A), the voltage of the first converter terminal Q31 shown in Figure 2 corresponds to the voltage of the first connection terminal P71 shown in Figure 10(A), and the voltage of the fourth converter terminal Q34 shown in Figure 2 corresponds to the voltage of the third connection terminal P73 shown in Figure 10(A). When a control configuration such as the control circuit 752 according to the example of Figures 10(A) and 10(B) is applied to the holding time extension unit 52 in the switching power supply device 13 shown in Figure 3, switching between the charge mode and the discharge mode is controlled based on the voltage of the third converter terminal Q43, the voltage of the first converter terminal Q41, and the voltage of the third connection terminal P43. Specifically, the voltage of the third converter terminal Q43 shown in Figure 3 corresponds to the voltage of the second connection terminal P72 (the voltage of the third converter terminal Q73) shown in Figure 10(A), the voltage of the first converter terminal Q41 shown in Figure 3 corresponds to the voltage of the first connection terminal P71 shown in Figure 10(A), and the voltage of the third connection terminal P43 shown in Figure 3 corresponds to the voltage of the third connection terminal P73 shown in Figure 10(A).

[0142] FIG. 11 is a diagram showing an example of a waveform of a voltage detected by the voltage detection unit 751 according to the embodiment. 11, the horizontal axis represents time (t) and the vertical axis represents the voltage (Vac) level. Also shown are waveforms 3111 and 3112. When a control configuration such as the control circuit 752 of the examples of Figures 10(A) and 10(C) is applied to the example of Figure 1 or the example of Figure 4, the voltage waveform shown in Figure 11 is detected using the voltage detection unit 751. In this case, by detecting the voltage waveform of the + terminal, both the L-phase (non-grounded side) waveform 3111 and the N-phase (grounded side) waveform 3112 are detected. The L-phase waveform 3111 and the N-phase waveform 3112 are alternately repeated.

[0143] FIG. 12 is a diagram showing an example of a waveform of a voltage detected by the voltage detection unit 751 according to the embodiment. 12, the horizontal axis represents time (t) and the vertical axis represents the voltage (Vac) level. Also shown is a waveform 3211. When a control configuration such as the control circuit 752 of the examples of FIGS. 10(A) and 10(B) is applied to the example of FIG. 2 or the example of FIG. 3, in voltage detection at the + terminal, the voltage waveform shown in FIG. 12 is detected using the voltage detection unit 751. In this case, by detecting the voltage waveform of the + terminal, the waveform 3211 of the L phase (non-grounded side) is detected, but the waveform of the N phase (grounded side) is not detected. In this way, by only detecting the voltage of the + terminal, the N phase voltage is lost, so there is a possibility that a delay in detecting a momentary interruption or the like occurs compared to the detection voltage in the example of FIG.

[0144] In this way, when a control circuit is applied to the example of Fig. 1 or the example of Fig. 4, the detection unit terminal is connected only to the + terminal, and it is possible to detect the L phase and N phase voltages. In this case, the voltage of the + terminal becomes the voltage waveform (Vac) to be detected. On the other hand, when a control circuit is applied to the example of Figure 2 or the example of Figure 3, if the configuration that can only detect the voltage of one phase using the detection unit is insufficient, for example, the terminal of the detection unit may be connected to the other phase. For example, like the examples of FIG. 2 and FIG. 3, in the examples of FIG. 10(A) and FIG. 10(B), when the terminal of the voltage detection unit 751 is connected to the N phase, a voltage waveform to be detected is obtained.

[0145] As a specific example of such a case, when a control configuration such as the control circuit 752 shown in the examples of Figures 10(A) and 10(B) is applied to the holding time extension unit 42 in the switching power supply device 12 shown in Figure 2, switching between the charge mode and the discharge mode is controlled based on the N-phase voltage of the power supply 131 (the voltage at the fourth converter terminal Q34) and the voltage at the third converter terminal Q33. Also, as a specific example, when a control configuration such as the control circuit 752 according to the example of Figures 10(A) and 10(B) is applied to the hold time extension unit 52 in the switching power supply device 13 shown in Figure 3, switching between the charge mode and the discharge mode is controlled based on the N-phase voltage of the power supply 151 and the voltage of the third converter terminal Q43.

[0146] (Specific configuration examples of switching power supply devices according to other configuration examples) Specific configuration examples of switching power supply devices according to other configuration examples will be described with reference to FIGS.

[0147] <Switching power supply device according to the example of FIG. 13> FIG. 13 is a diagram showing an example of a specific circuit configuration of a switching power supply device 801 according to an embodiment. The switching power supply device 801 includes a boost circuit 31 having a PFC function, a hold time extension unit 811, and a capacitor addition unit 812 which is a hold time extension unit according to the conventional example. In this embodiment, the boost circuit 31 corresponds to an AC / DC power supply to be compensated, and the hold time extension unit 811 corresponds to an additional unit. Moreover, in FIG. 13, the control circuit is omitted.

[0148] It should be noted that the capacitor additional unit 812 according to the conventional example is also an example of an additional unit, but is shown for reference in the example of Fig. 13. For this reason, the switching power supply device 801 does not necessarily need to be provided with the capacitor additional unit 812. In other words, the switching power supply device 801 may have a circuit configuration including the power supply 111, the boost circuit 31, and the hold time extension unit 811.

[0149] The boost circuit 31 is connected to a power supply 111 . Here, in the example of FIG. 13, the boost circuit 31 and the power supply 111 are similar to those shown in FIG. 1, and are denoted by the same reference numerals.

[0150] The hold time extension unit 811 includes an inductor 831 formed of, for example, a coil, a switching element 832 formed of a MOS type FET, a diode 834, a first switch element 835, and a capacitive element section 836. Here, in the hold time extension unit 811, an inductor 831, a switching element 832, and a diode 834 are used to configure a charging converter. Although the example of FIG. 13 shows the capacitive element portion 836 including one capacitive element, the capacitive element portion 836 may be configured using a plurality of capacitive elements.

[0151] For ease of explanation, in the hold time extension unit 811, the two terminals to which the boost circuit 31 is connected will be referred to as a first connection terminal P81 and a second connection terminal P82. In this embodiment, the first input terminal T31 of the boost circuit 31 and the first connection terminal P81 of the hold time extension unit 811 are negative terminals and connected to each other, and the second input terminal T32 of the boost circuit 31 and the second connection terminal P82 of the hold time extension unit 811 are positive terminals and connected to each other.

[0152] The source of the switching element 832, one end of the capacitive element portion 836, and the first connection terminal P81 are connected. The drain of the switching element 832, the anode of the diode 834, one end of the first switch element 835, and one end of the inductor 831 are connected. The other end of the inductor 831 is connected to the second connection terminal P82. The cathode of the diode 834, the other end of the first switch element 835, and the other end of the capacitive element section 836 are connected. In the example of FIG. 13, the capacitive element section 836 is configured using an electrolytic capacitor, and the other end of the capacitive element section 836 is the + side.

[0153] Here, the conventional capacitor addition unit 812 will be described. In the example of FIG. 13, a circuit configuration example is shown in which a hold time extension unit 811 is connected to a switching power supply device 801 and a capacitor addition unit 812 is also connected.

[0154] The capacitor addition unit 812 includes two capacitive elements 871 and 872 , a resistor 873 , and a diode 874 . For ease of explanation, in the capacitor addition unit 812, the two terminals to which the boost circuit 31 is connected will be referred to as a first additional unit terminal U81 and a second additional unit terminal U82. In the example of Figure 13, the first output terminal T11 of the boost circuit 31 and the first additional unit terminal U81 of the capacitor addition unit 812 are connected to each other as negative terminals, and the second output terminal T12 of the boost circuit 31 and the second additional unit terminal U82 of the capacitor addition unit 812 are connected to each other as positive terminals.

[0155] One end of the capacitive element 871 and one end of the capacitive element 872 are connected to the first additional unit terminal U81. The other end of the capacitance element 871, the other end of the capacitance element 872, one end of the resistor 873, and the anode of the diode 874 are connected. The other end of the resistor 873, the cathode of the diode 874, and the second additional unit terminal U82 are connected.

[0156] Here, in the example of FIG. 13, a configuration is shown in which one end of the first switch element 835 is connected to one end of the inductor 831. However, as another configuration example, a configuration in which one end of the first switch element 835 is connected to the other end of the inductor 831 may be used.

[0157] The capacitor adding unit 812 is an example of a conventional technique for extending the instantaneous power failure compensation time. The capacitor adding unit 812 has a simple configuration, but since it can only utilize the energy of the input electrolytic capacitor up to the corresponding lower limit of the input voltage of the downstream converter, the size of the added capacitor becomes large. In response to this, a technique has been considered in which a switch is provided between the other end of capacitive element 871 and the other end of capacitive element 872 and one end of inductor 116, and the switch connects an additional capacitor to the input of the PFC, and the energy of the additional capacitor is utilized up to a capacitor voltage that can be boosted by the PFC. However, there is a problem in that the loss in the limiting resistor is large, including during the backup period.

[0158] <Switching power supply device according to the example of FIG. 14> FIG. 14 is a diagram showing an example of a specific circuit configuration of a hold time extension unit 911 in a switching power supply device 901 according to an embodiment. In the example of FIG. 14, the boost circuit and the power supply in the switching power supply device 901 are omitted. Moreover, in FIG. 14, the control circuit is omitted.

[0159] The hold time extension unit 911 includes an inductor 931 formed, for example, by a coil, a switching element 932 formed by a MOS type FET, n (n is an integer equal to or greater than 1) capacitance elements 934-1 to 934-n, n inductors 935-1 to 935-n formed, for example, by coils, n diodes 936-1 to 936-n, a first switch element 937, and n capacitance elements 938-1 to 938-n. Here, in the hold time extension unit 911, a charging converter is configured using an inductor 931, a switching element 932, capacitive elements 934-1 to 934-n, inductors 935-1 to 935-n, and diodes 936-1 to 936-n.

[0160] In the example of FIG. 14, a circuit portion including the inductors 935-1 to 935-n, the diodes 936-1 to 936-n, and the capacitive elements 938-1 to 938-n corresponds to the power storage unit 912. In the example of FIG. 14, a circuit portion including one inductor 935-i (i is an integer equal to or greater than 1 and equal to or less than n), one diode 936-i, and one capacitance element 938-i corresponds to a charging circuit unit. In this manner, the power storage unit 912 is configured from n charging circuit units.

[0161] For convenience of explanation, in the hold time extension unit 911, the two terminals to which the boost circuit is connected will be referred to as a first connection terminal P91 and a second connection terminal P92.

[0162] Here, FIG. 14 shows wiring 951 according to another configuration example. First, a case where the wiring 951 is not provided will be described.

[0163] The source of the switching element 932, one end of the inductor 935-1, one end of the capacitive element 938-1, and a first connection terminal P91 are connected to each other. In the relationship between the i-th charging circuit unit and the (i+1)-th charging circuit unit (where i is an integer greater than or equal to 1 and less than or equal to (n-1)), one end of the inductor 935-(i+1), one end of the capacitance element 938-(i+1), the cathode of the diode 936-i, and the other end of the capacitance element 938-i are connected. In the i-th charging circuit unit, the other end of the inductor 935-i, the anode of the diode 936-i, and one end of the capacitive element 934-i are connected to each other. The cathode of the diode 936-n, the other end of the capacitance element 938-n, and one end of the first switch element 937 are connected. The other end of each of the n capacitance elements 934-1 to 934-n, the other end of the first switch element 937, the drain of the switching element 932, and one end of the inductor 931 are connected to each other. The other end of the inductor 931 is connected to a second connection terminal P92.

[0164] A wiring 951 according to another configuration example may be provided instead of the wiring 952 shown in Fig. 14. In other words, the other end of the first switch element 937 may be connected to the other end of the inductor 931 instead of one end of the inductor 931.

[0165] In the example of Figure 14, a non-isolated SEPIC is used. In the example of Fig. 14, a BMS may be provided and control may be performed by the BMS. Furthermore, the series (cascade-connected) batteries (series capacitance elements 938-1 to 938-n in the example of Fig. 14) have a high energy density.

[0166] <Switching power supply device according to the example of FIG. 15> FIG. 15 is a diagram showing an example of a specific circuit configuration of a hold time extension unit 1011 in a switching power supply device 1001 according to an embodiment. In the example of FIG. 15, the boost circuit and the power supply in the switching power supply device 1001 are omitted. Moreover, in FIG. 15, the control circuit is omitted.

[0167] The hold time extension unit 1011 includes an inductor 1031 formed of, for example, a coil, a switching element 1032 formed of a MOS type FET, n inductors 1034-1 to 1034-n (n is an integer equal to or greater than 1) formed of, for example, coils, n diodes 1035-1 to 1035-n, a first switch element 1036, and n capacitance elements 1037-1 to 1037-n. Here, in the hold time extension unit 1011, a charging converter is configured using an inductor 1031, a switching element 1032, inductors 1034-1 to 1034-n, and diodes 1035-1 to 1035-n.

[0168] In the example of FIG. 15, a circuit portion including the inductors 1034-1 to 1034-n, the diodes 1035-1 to 1035-n, and the capacitance elements 1037-1 to 1037-n corresponds to the power storage unit 1012. In the example of FIG. 15, a circuit portion including one inductor 1034-i (i is an integer between 1 and n), one diode 1035-i, and one capacitance element 1037-i corresponds to a charging circuit unit. In this manner, the power storage unit 1012 is configured from n charging circuit units.

[0169] For convenience of explanation, in the hold time extension unit 1011, the two terminals to which the boost circuit is connected will be referred to as a first connection terminal P101 and a second connection terminal P102.

[0170] The source of the switching element 1032, one end of the inductor 1034-1, one end of the capacitive element 1037-1, and the first connection terminal P101 are connected to each other. In the relationship between the i-th charging circuit unit and the (i+1)-th charging circuit unit (where i is an integer greater than or equal to 1 and less than or equal to (n-1)), one end of the inductor 1034-(i+1), one end of the capacitance element 1037-(i+1), the cathode of the diode 1035-i, and the other end of the capacitance element 1037-i are connected. In the i-th charging circuit unit, the other end of the inductor 1034-i is connected to the anode of the diode 1035-i. The cathode of the diode 1035-n, the other end of the capacitance element 1037-n, and one end of the first switch element 1036 are connected. The drain of the switching element 1032 and one end of the inductor 1031 are connected. The other end of the inductor 1031, the other end of the first switch element 1036, and the second connection terminal P102 are connected to each other.

[0171] In the example of FIG. 15, when viewed from the side of the capacitance elements 1037-1 to 1037-n, the n inductors 1034-1 to 1034-n serve as primary inductors, and the inductor 1031 serves as a secondary inductor. In the example of Figure 15, an isolated converter is used. In the example of Fig. 15, a BMS may be provided and control may be performed by the BMS. Furthermore, the series (cascade-connected) batteries (series capacitance elements 1137-1 to 1137-n in the example of Fig. 15) have a high energy density.

[0172] <Switching power supply device according to the example of FIG. 16> FIG. 16 is a diagram showing an example of a specific circuit configuration of a hold time extension unit 1111 in a switching power supply device 1101 according to an embodiment. In the example of FIG. 16, the boost circuit and the power supply in the switching power supply device 1101 are omitted. Moreover, in FIG. 16, the control circuit is omitted.

[0173] The hold time extension unit 1111 includes an inductor 1131, for example, a coil, a switching element 1132, for example, a MOS type FET, a capacitance element 1134, an inductor 1135, for example, a coil, n inductors 1136-1 to 1136-n, for example, coils (n is an integer greater than or equal to 1), n ​​diodes 1135-1 to 1135-n, a first switch element 1138, and n capacitance elements 1139-1 to 1139-n. Here, in the hold time extension unit 1111, a charging converter is configured using an inductor 1131, a switching element 1132, a capacitance element 1134, an inductor 1135, inductors 1136-1 to 1136-n, and diodes 1135-1 to 1135-n.

[0174] In the example of FIG. 16, a circuit portion including the inductors 1136-1 to 1136-n, the diodes 1135-1 to 1135-n, and the capacitance elements 1139-1 to 1139-n corresponds to the power storage unit 1112. In the example of FIG. 16, a circuit portion including one inductor 1136-i (i is an integer between 1 and n), one diode 1135-i, and one capacitance element 1139-i corresponds to a charging circuit unit. In this manner, the power storage unit 1112 is configured from n charging circuit units.

[0175] For convenience of explanation, in the hold time extension unit 1111, the two terminals to which the boost circuit is connected will be referred to as a first connection terminal P111 and a second connection terminal P112.

[0176] Here, FIG. 16 shows wiring 1151 according to another configuration example. First, a case where the wiring 1151 is not provided will be described.

[0177] The source of the switching element 1132, one end of the inductor 1135, one end of the inductor 1136-1, one end of the capacitive element 1139-1, and the first connection terminal P111 are connected. The other end of the inductor 1135 is connected to one end of the capacitance element 1134 . In the relationship between the i-th charging circuit unit and the (i+1)-th charging circuit unit (where i is an integer greater than or equal to 1 and less than or equal to (n-1)), one end of the inductor 1136-(i+1), one end of the capacitance element 1139-(i+1), the cathode of the diode 1135-i, and the other end of the capacitance element 1139-i are connected. In the i-th charging circuit unit, the other end of the inductor 1136-i is connected to the anode of the diode 1135-i. The cathode of the diode 1135-n, the other end of the capacitance element 1139-n, and one end of the first switch element 1138 are connected. The drain of the switching element 1132, the other end of the capacitance element 1134, the other end of the first switch element 1138, and one end of the inductor 1131 are connected. The other end of the inductor 1131 is connected to the second connection terminal P112.

[0178] A wiring 1151 according to another configuration example may be provided instead of the wiring 1152 shown in Fig. 16. In other words, the other end of the first switch element 1138 may be connected to the other end of the inductor 1131 instead of one end of the inductor 1131.

[0179] In the example of FIG. 16, when viewed from the side of the capacitive elements 1137-1 to 1137-n, the n inductors 1136-1 to 1136-n serve as primary inductors, and the inductor 1135 serves as a secondary inductor. In the example of Figure 16, an isolated converter is used. In the example of Fig. 16, a BMS may be provided and control may be performed by the BMS. Furthermore, the series (cascade-connected) batteries (series capacitance elements 1139-1 to 1139-n in the example of Fig. 16) have a high energy density.

[0180] <Switching power supply device according to the example of FIG. 17> FIG. 17 is a diagram showing an example of a specific circuit configuration of a hold time extension unit 1211 in a switching power supply device 1201 according to an embodiment. In the example of FIG. 17, the boost circuit and the power supply in the switching power supply device 1201 are omitted. Moreover, in FIG. 17, the control circuit is omitted.

[0181] The hold time extension unit 1211 includes an inductor 1231 formed, for example, of a coil, a switching element 1232 formed of a MOS type FET, n (n is an integer equal to or greater than 1) inductors 1234-1 to 1234-n formed, for example, of coils, n switching elements 1235-1 to 1235-n formed of MOS type FETs, a first switch element 1237, and n capacitive elements 1238-1 to 1238-n. Here, in the holding time extension unit 1211, a charging converter is configured using an inductor 1231, a switching element 1232, inductors 1234-1 to 1234-n, and switching elements 1235-1 to 1235-n.

[0182] In the example of FIG. 17, a circuit portion including the inductors 1234-1 to 1234-n, the switching elements 1235-1 to 1235-n, and the capacitance elements 1238-1 to 1238-n corresponds to the power storage unit 1212. In the example of FIG. 17, a circuit portion including one inductor 1134-i (i is an integer between 1 and n), one switching element 1235-i, and one capacitance element 1238-i corresponds to a charging circuit unit. In this manner, the power storage unit 1212 is configured from n charging circuit units.

[0183] For convenience of explanation, in the hold time extension unit 1211, the two terminals to which the boost circuit is connected will be referred to as a first connection terminal P121 and a second connection terminal P122.

[0184] The source of the switching element 1232, one end of the inductor 1234-1, one end of the capacitive element 1238-1, and the first connection terminal P121 are connected to each other. The drain of the switching element 1232 and one end of the inductor 1231 are connected. In the relationship between the i-th charging circuit unit and the (i+1)-th charging circuit unit (where i is an integer greater than or equal to 1 and less than or equal to (n-1)), one end of inductor 1234-(i+1) is connected to the other end of inductor 1234-i and the source of switching element 1235-i, and one end of capacitance element 1238-(i+1) is connected to the other end of capacitance element 1238-i and the drain of switching element 1235-i. The other end of the capacitance element 1238-n, the drain of the switching element 1235-n, and one end of the first switch element 1237 are connected. The other end of the inductor 1231, the other end of the first switch element 1237, and the second connection terminal P122 are connected to each other.

[0185] In the example of FIG. 17, when viewed from the side of the capacitive elements 1139-1 to 1139-n, the n inductors 1234-1 to 1234-n serve as primary inductors, and the inductor 1231 serves as a secondary inductor. In the example of Figure 17, an isolated converter is used. In the example of Fig. 17, a BMS may be provided and control may be performed by the BMS. Furthermore, the series (cascade-connected) batteries (series capacitance elements 1238-1 to 1238-n in the example of Fig. 17) have a high energy density.

[0186] 14 to 17, any energy buffer voltage can be used, and therefore application to an energy buffer such as an LiB or EDLC with a voltage of 5V or less per unit cell is also possible. The examples in Fig. 14 and Fig. 16 are examples of additional units in which this method is applied to EDLC and LiB. The example in Fig. 14 is an application example of a cell balancing circuit using cascade connection of SEPICs. The example in Fig. 16 is an application example of a cell balancing circuit using isolated SEPICs. The converter to which the cell balance circuit is applied is not limited to a multi-stage connection of SEPIC converters, but may be a multi-stage connection of SuperBuck converters or Zeta converters. The examples of Fig. 15 and Fig. 17 are examples in which a known cell balance circuit is used.

[0187] Furthermore, the specific circuit configurations of the hold time extension units shown in FIGS. 5 and 13 to 17 may be applied, for example, not only to the configuration shown in FIG. 1 but also to the configurations shown in FIGS. 2 to 4.

[0188] <Configuration example> [Configuration example including the examples of Figs. 1 to 4: hereinafter referred to as configuration example A.] As one configuration example (configuration example including the examples of Figures 1 to 4), a switching power supply device including a boost circuit includes a hold time extension unit connected to a first input terminal and a second input terminal of the boost circuit, the hold time extension unit includes a charging converter, a capacitive element, and a first switch element, the charging converter has a first converter terminal, a second converter terminal, and a third converter terminal, the first converter terminal and the third converter terminal are connected to the first input terminal and the second input terminal directly or via another circuit, the capacitive element is connected between the first converter terminal and the second converter terminal, and the first switch element is connected between the second converter terminal and the second input terminal.

[0189] [Example of configuration A in Fig. 1] In one configuration example (configuration example of Figure 1), the first converter terminal is connected to the first input terminal, the third converter terminal is connected to the second input terminal, and the first switch element is connected between the second converter terminal and the third converter terminal. As one configuration example (operation example of Figure 1), during normal times when power is normally supplied from a power source to the boost circuit, the first switch element is turned off and the charging converter operates normally, causing the capacitive element to be in a charging state or a charge retention state by the charging converter, and during abnormal times, the first switch element is turned on and the charging converter is stopped, causing power to be supplied from the capacitive element to the boost circuit. In one configuration example (the configuration example of FIG. 1), the first switch element is connected to the third converter terminal via one or both of a rectifier element and an inductor.

[0190] [Configuration example of Figure 2 in Configuration Example A] As one configuration example (configuration example of Figure 2), the hold time extension unit is connected to the first input terminal, the second input terminal, and the third input terminal of the boost circuit, the hold time extension unit further includes a second switch element, the charging converter further has a fourth converter terminal, the first converter terminal is connected to the first input terminal, the third converter terminal is connected to the second input terminal, the first switch element is connected between the second converter terminal and the third converter terminal, the fourth converter terminal is connected to the third input terminal, and the second switch element is connected between the second converter terminal and the fourth converter terminal. As one configuration example (operation example of FIG. 2), during normal times when power is normally supplied from a power source to the boost circuit, the first switch element and the second switch element are turned off and the charging converter operates normally, causing the capacitive element to be in a charging state or a charge retention state by the charging converter, and during abnormal times, the first switch element and the second switch element are turned on and the charging converter is stopped, causing power to be supplied from the capacitive element to the boost circuit. As one configuration example (the configuration example of FIG. 2), at least one of the first switch element and the second switch element is driven based on a detection voltage detected at the fourth converter terminal. As one configuration example (configuration example of FIG. 2), the first switch element is connected to the third converter terminal via one or both of a rectifier element and an inductor, and the second switch element is connected to the fourth converter terminal via one or both of a rectifier element and an inductor.

[0191] [Example of configuration A in Fig. 3] As one configuration example (configuration example of FIG. 3), the holding time extension unit further includes a voltage detection unit, the first converter terminal is connected to the first input terminal, the third converter terminal is connected to the second input terminal, the first switch element is connected between the second converter terminal and the third converter terminal, and the voltage detection unit has a first terminal for voltage detection connected to the third input terminal, a second terminal for voltage detection connected to the second input terminal, and a third terminal for outputting a control signal to the charging converter based on the voltage detected at the first terminal and the voltage detected at the second terminal. As one configuration example (operation example of FIG. 3), during normal times when power is normally supplied from a power source to the boost circuit, the first switch element is turned off and the charging converter operates normally, causing the capacitive element to be in a charging state or a charge retention state by the charging converter, and during abnormal times, the first switch element is turned on and the charging converter is stopped, causing power to be supplied from the capacitive element to the boost circuit. In one configuration example (the configuration example of FIG. 3), the first switch element is connected to the third converter terminal via a rectifier element.

[0192] [Configuration example of Figure 4 in configuration example A] As one configuration example (configuration example of FIG. 4), a rectifier circuit is further provided inside or outside the hold time extension unit, and the hold time extension unit further includes a second switch element, the first converter terminal and the third converter terminal are connected to the boost circuit via the rectifier circuit (the first converter terminal and the third converter terminal are connected to the first input terminal and the second input terminal via the rectifier circuit), and the second switch element is connected between the first converter terminal and the first input terminal. As one configuration example (operation example of FIG. 4), during normal times when power is normally supplied from a power source to the boost circuit, the first switch element and the second switch element are turned off and the charging converter operates normally, causing the capacitive element to be in a charging state or a charge retention state by the charging converter, and during abnormal times, the first switch element and the second switch element are turned on and the charging converter is stopped, causing power to be supplied from the capacitive element to the boost circuit. In one configuration example (the configuration example of FIG. 4), the first switch element is connected to the second input terminal via a rectifier element.

[0193] [Example of configuration A in Figs. 1 to 4] As one configuration example (configuration example of FIGS. 1 to 4), the hold time extension unit further includes a battery management system that manages the capacitive element. In one configuration example (configuration example of FIGS. 1 to 4), the hold time extension unit includes a DC cut capacitor.

[0194] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and designs that do not deviate from the gist of the present invention are also included. [Explanation of symbols]

[0195] 11, 12, 13, 14, 601, 801, 901, 1001, 1101, 1201...Switching power supply unit, 31, 41, 51, 61...Boost circuit, 32, 42, 52, 62, 611, 701, 811, 911, 1011, 1111, 1211...Holding time extension unit, 111, 131, 151, 171...Power supply, DB1, 63...Diode bridge, 112-115, 119, 132-133, 137, 141, 157-158, 177-178, 233, 334-335 , 433, 551 to 554, 636, 733, 771 to 772, 834, 874, 936-1 to 936-n, 1035-1 to 1035-n, 1137-1 to 1137-n...Diodes, 116, 134, 138, 152, 172, 631, 635, 831, 931, 935-1 to 935-n, 1031, 1034-1 to 1034-n, 1131, 1135, 1136-1 to 1136-n, 1231, 1234-1 to 1234-n...Inductors, 117, 135, 139, 15 3, 155, 173, 175, 632, 832, 932, 1032, 1132, 1232, 1235-1 to 1235-n ... switching elements, 120, 142, 159, 179, 231-1 to 231-n, 331-1 to 331-n, 431-1 to 431-n, 531-1 to 531-n, 634, 731-1 to 731-n, 836, 871 to 872, 934-1 to 934-n, 938-1 to 938-n, 1037-1 to 1037-n, 1134, 1139-1 to 1139-n, 1238-1 to 1238-n...capacitive element, 211, 311, 411, 511, 711...charging converter, 212, 312, 412, 512, 712...battery management system (BMS), 231, 331, 431, 531, 638, 731...capacitive element section, 232, 332, 432, 532, 637, 732, 835, 937, 1036, 1138, 1237...first switch element, 333...second switch element, 234 to 235, 336 to 339, 639 to 640,734 to 735, 951 to 952, 1151 to 1152... Wiring, 451, 751, 751a, 751b... Voltage detection unit, 536... Non-interference switch element (second switch element), 752... Control circuit, 812... Capacitor addition unit, 873... Resistor, 912, 1012, 1112, 1212... Storage unit, 3011 to 3013, 3111 to 3112, 3211... Waveform, T11, T 311, T411, T511...First output terminal, T12, T312, T412, T512...Second output terminal, T31, T331, T431, T531...First input terminal, T32, T332, T432, T532...Second input terminal, T333, T433...Third input terminal, P1, P31, P41, P51, P61, P71, P81, P91, P101, P111, P121...First connection terminal, P 2, P32, P42, P52, P62, P72, P82, P92, P102, P112, P122...2nd connection terminal, P33, P43, P53...3rd connection terminal, P54...4th connection terminal, Q1, Q31, Q41, Q51, Q71...1st converter terminal, Q2, Q32, Q42, Q52, Q72...2nd converter terminal, Q3, Q33, Q43, Q53, Q73...3rd converter terminal, Q 4, Q34, Q44, Q54, Q74...4th converter terminal, Q35, Q45, Q55...5th converter terminal, R71...1st controller terminal, R72...2nd controller terminal, R73...3rd controller terminal, R74...4th controller terminal, R75...5th controller terminal, R76...6th controller terminal, U81...1st additional unit terminal, U82...2nd additional unit terminal,

Claims

1. In a switching power supply device equipped with a boost circuit, a hold time extension unit connected to a first input terminal and a second input terminal of the boost circuit; the hold time extension unit includes a charging converter, a capacitance element, and a first switch element; the charging converter has a first converter terminal, a second converter terminal, and a third converter terminal; the first converter terminal and the third converter terminal are connected to the first input terminal and the second input terminal directly or via another circuit; the capacitive element is connected between the first converter terminal and the second converter terminal; the first switch element is connected between the second converter terminal and the second input terminal; the hold time extension unit is connected to the first input terminal, the second input terminal and the third input terminal of the boost circuit; The hold time extension unit further includes a second switch element, the charging converter further has a fourth converter terminal; the first converter terminal is connected to the first input terminal; the third converter terminal is connected to the second input terminal; the first switch element is connected between the second converter terminal and the third converter terminal; the fourth converter terminal is connected to the third input terminal; the second switch element is connected between the second converter terminal and the fourth converter terminal; Switching power supply.

2. During normal operation when power is normally supplied from a power source to the boost circuit, the first switch element and the second switch element are turned off and the charging converter operates normally, thereby causing the capacitance element to be in a charging state or a charge holding state by the charging converter; During an abnormal period, the first switch element and the second switch element are turned on, and the charging converter is stopped, thereby supplying power from the capacitive element to the boost circuit.

2. The switching power supply device according to claim 1.

3. driving at least one of the first switch element and the second switch element based on a detection voltage detected at the fourth converter terminal; 3. The switching power supply device according to claim 2.

4. the first switch element is connected to the third converter terminal via one or both of a rectifier element and an inductor; the second switch element is connected to the fourth converter terminal via one or both of a rectifier element and an inductor; The switching power supply device according to any one of claims 1 to 3.

5. In a switching power supply device equipped with a boost circuit, a hold time extension unit connected to a first input terminal and a second input terminal of the boost circuit; the hold time extension unit includes a charging converter, a capacitance element, and a first switch element; the charging converter has a first converter terminal, a second converter terminal, and a third converter terminal; the first converter terminal and the third converter terminal are connected to the first input terminal and the second input terminal directly or via another circuit; the capacitive element is connected between the first converter terminal and the second converter terminal; the first switch element is connected between the second converter terminal and the second input terminal; Further, a rectifier circuit is provided inside or outside the retention time extension unit, The hold time extension unit further includes a second switch element, the first converter terminal and the third converter terminal are connected to the boost circuit via the rectifier circuit; the second switch element is connected between the first converter terminal and the first input terminal; Switching power supply.

6. During normal operation when power is normally supplied from a power source to the boost circuit, the first switch element and the second switch element are turned off and the charging converter operates normally, thereby causing the capacitance element to be in a charging state or a charge holding state by the charging converter; During an abnormal period, the first switch element and the second switch element are turned on, and the charging converter is stopped, thereby supplying power from the capacitive element to the boost circuit.

6. The switching power supply device according to claim 5.

7. the first switch element is connected to the second input terminal via a rectifier element; 7. The switching power supply device according to claim 5 or 6.

8. In a switching power supply device equipped with a boost circuit, a hold time extension unit connected to a first input terminal and a second input terminal of the boost circuit; the hold time extension unit includes a charging converter, a capacitance element, and a first switch element; the charging converter has a first converter terminal, a second converter terminal, and a third converter terminal; the first converter terminal and the third converter terminal are connected to the first input terminal and the second input terminal directly or via another circuit; the capacitive element is connected between the first converter terminal and the second converter terminal; the first switch element is connected between the second converter terminal and the second input terminal; the boost circuit includes a boost circuit switching element, a boost circuit inductor, and a boost circuit capacitive element; the first input terminal is connected to one end of the boost circuit switching element, the second input terminal is connected to the other end of the boost circuit switching element, In a configuration in which there is one capacitance element, the voltage across the capacitance element is a first voltage, in a configuration in which a plurality of capacitance elements are connected in series, the voltage across the plurality of capacitance elements is the first voltage, in a configuration in which there is one capacitance element for the boost circuit, the voltage across the capacitance element for the boost circuit is a second voltage, and in a configuration in which a plurality of capacitance elements for the boost circuit are connected in series, the voltage across the plurality of capacitance elements for the boost circuit is the second voltage, whereby the first voltage is set to a voltage lower than the second voltage. Switching power supply.

9. the first converter terminal is connected to the first input terminal; the third converter terminal is connected to the second input terminal; the first switch element is connected between the second converter terminal and the third converter terminal; 9. The switching power supply device according to claim 8.

10. During normal operation when power is normally supplied from a power source to the boost circuit, the first switch element is turned off and the charging converter operates normally, thereby causing the capacitance element to be in a charging state or a charge holding state by the charging converter; During an abnormal period, the first switch element is turned on and the charging converter is stopped, thereby supplying power from the capacitive element to the boost circuit.

10. The switching power supply device according to claim 9.

11. the first switch element is connected to the third converter terminal via one or both of a rectifier element and an inductor; 11. The switching power supply device according to claim 9 or 10.

12. The hold time extension unit further includes a voltage detection unit, the first converter terminal is connected to the first input terminal; the third converter terminal is connected to the second input terminal; the first switch element is connected between the second converter terminal and the third converter terminal; the voltage detection unit has a first terminal for voltage detection connected to a third input terminal, a second terminal for voltage detection connected to the second input terminal, and a third terminal for outputting a control signal to the charging converter based on the voltage detected at the first terminal and the voltage detected at the second terminal.

9. The switching power supply device according to claim 8.

13. During normal operation when power is normally supplied from a power source to the boost circuit, the first switch element is turned off and the charging converter operates normally, thereby causing the capacitance element to be in a charging state or a charge holding state by the charging converter; During an abnormal period, the first switch element is turned on and the charging converter is stopped, thereby supplying power from the capacitive element to the boost circuit.

13. The switching power supply device according to claim 12.

14. the first switch element is connected to the third converter terminal via a rectifier element; 14. The switching power supply device according to claim 12 or 13.

15. The holding time extension unit further includes a battery management system that manages the capacitive element. The switching power supply device according to any one of claims 1 to 14.

16. The hold time extension unit includes a DC cut capacitor. The switching power supply device according to any one of claims 1 to 15.

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