Power supply device

Abstract

To provide a power supply device capable of appropriately controlling a current supplied to the power supply device.SOLUTION: A power supply device that supplies electric power to a power supplied unit, comprises: a rectification unit that is configured to convert a first supply power supplied from an AC power supply from AC power to DC power; a power conversion unit that is configured to convert a second supply voltage of the second supply power supplied from the rectification unit or to convert a second supply power from DC power to AC power; and a control unit that is configured to control the power conversion unit. The control unit is configured to control the power conversion unit on the basis of at least one of the first supply voltage of the first supply power and a first supply current of the first supply power.SELECTED DRAWING: Figure 1

Description

[Technical field]

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

[0002] The power conversion device disclosed in Patent Document 1 includes, for example, a rectification unit, which converts power from AC to DC. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-30115 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to provide a power supply device capable of suitably controlling a current supplied to the power supply device. [Means for solving the problem]

[0005] A power supplying device according to a first aspect of the present disclosure is a power supplying device that supplies power to a powered unit, and includes a rectification unit configured to convert a first supply power supplied from an AC power source from AC to DC, a power conversion unit configured to convert a second supply voltage of a second supply power supplied from the rectification unit or to convert the second supply power from DC to AC, and a control unit configured to control the power conversion unit, wherein the control unit is configured to control the power conversion unit based on at least one of a first supply voltage of the first supply power and a first supply current of the first supply power. According to the power supply device of the first aspect, the control unit controls the power conversion unit based on at least one of the first supply voltage and the first supply current, thereby making it possible to suitably control the current supplied to the power supply device.

[0006] In a power supply device of a second aspect according to the first aspect of the present disclosure, the control unit is configured to control the rectification unit based on the at least one of the first supply voltage and the first supply current. According to the power supply device of the second aspect, the control unit can suitably control the current supplied to the power supply device by controlling the power conversion unit and the rectification unit based on at least one of the first supply voltage and the first supply current.

[0007] In a power supply device of a third aspect according to the second aspect of the present disclosure, the rectifier section has a first switching element, and the control section is configured to control the first switching element. According to the power supply device of the third aspect, the control unit can suitably control the current supplied to the power supply device by controlling the first switching element.

[0008] A power supply device according to a fourth aspect of the present disclosure is a power supply device that supplies power to a powered unit, and includes a rectifier unit configured to convert a first supply power supplied from an AC power source from AC to DC, and a control unit configured to control the rectifier unit, wherein the rectifier unit has a first switching element, and the control unit is configured to control the rectifier unit so that operation of the first switching element is stopped or suppressed based on at least one of a first supply voltage of the first supply power and a first supply current of the first supply power. According to the power supply device of the fourth aspect, the control unit can preferably control the current supplied to the power supply device by controlling the rectification unit so that operation of the first switching element is stopped or suppressed based on at least one of the first supply voltage and the first supply current.

[0009] In the power supply device of a fifth aspect according to the fourth aspect of the present disclosure, the power supply device further includes a power conversion unit configured to convert a second supply voltage of a second supply power supplied from the rectification unit or to convert the second supply power from direct current to alternating current, and the control unit is configured to control the power conversion unit based on the at least one of the first supply voltage and the first supply current. According to the power supply device of the fifth aspect, the control unit can suitably control the current supplied to the power supply device by controlling the power conversion unit and the rectification unit based on at least one of the first supply voltage and the first supply current.

[0010] In a sixth aspect of the power supply device according to the third or fifth aspect of the present disclosure, the control unit is configured to control the rectification unit such that operation of the first switching element is stopped or suppressed when at least one of the first supply voltage and the first supply current is in an abnormal state. According to the power supply device of the sixth aspect, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit controls the rectification unit so that operation of the first switching element is stopped or suppressed, thereby enabling the control of the current supplied to the power supply device to be suitably controlled.

[0011] In the power supply device of a seventh aspect according to the sixth aspect of the present disclosure, the control unit is configured to control the first switching element based on the at least one of the first supply voltage and the first supply current when the at least one of the first supply voltage and the first supply current is not in the abnormal state so as to suppress a phase shift between the current and the voltage on the output side of the first switching element. According to the power supply device of the seventh aspect, when at least one of the first supply voltage and the first supply current is not in an abnormal state, the control unit can improve the power factor by controlling the first switching element to suppress a phase shift between the current and the voltage on the output side of the first switching element.

[0012] In the power supply device of the eighth aspect according to the sixth or seventh aspect of the present disclosure, the control unit is configured to determine whether or not the at least one of the first supply voltage and the first supply current is in the abnormal state based on the at least one of the first supply voltage and the first supply current. According to the power supply device of the eighth aspect, the control unit can preferably determine whether or not at least one of the first supply voltage and the first supply current is in an abnormal state, based on at least one of the first supply voltage and the first supply current.

[0013] In a power supply device of a ninth aspect according to any one of the sixth to eighth aspects of the present disclosure, the abnormal state includes a state in which a voltage distortion of the first supply voltage occurs. According to the power supply device of the ninth aspect, when voltage distortion occurs in the first supply voltage, the control unit can adjust the current supplied to the first switching element by controlling the rectification unit so that operation of the first switching element is stopped or suppressed.

[0014] In a power supply device of a tenth aspect according to any one of the sixth to ninth aspects of the present disclosure, the power supply device further includes an alarm unit capable of notifying a user, and the control unit is configured to control the alarm unit to notify the user that the at least one of the first supply voltage and the first supply current is in the abnormal state when the at least one of the first supply voltage and the first supply current is in the abnormal state. According to the power supply device of the tenth aspect, the notification section allows a user to know that at least one of the first supply voltage and the first supply current is in an abnormal state.

[0015] In a power supply device of an eleventh aspect according to any one of the first to third and fifth aspects of the present disclosure, the power conversion unit has a second switching element operating to convert the second supply voltage, and the control unit is configured to control the second switching element. According to the power supply device of the eleventh aspect, the control unit can suitably control the current supplied to the power supply device by controlling the second switching element.

[0016] In a power supply device of a twelfth aspect according to an eleventh aspect of the present disclosure, the controller is configured to control the second switching element based on the at least one of the first supply voltage and the first supply current. According to the power supply device of the twelfth aspect, the control unit controls the second switching element based on at least one of the first supply voltage and the first supply current, thereby making it possible to suitably control the current supplied to the power supply device.

[0017] In the power supply device of the thirteenth aspect according to the twelfth aspect of the present disclosure, the control unit is configured to control the second switching element so that the first supply current is reduced when the at least one of the first supply voltage and the first supply current is in an abnormal state. According to the power supply device of the thirteenth aspect, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit controls the second switching element to reduce the current supplied to the power supply device.

[0018] In the power supply device of a fourteenth aspect according to a thirteenth aspect of the present disclosure, the control unit is configured to perform pulse width modulation control by the second switching element, and is configured to control the second switching element to reduce a duty ratio in the pulse width modulation control when the at least one of the first supply voltage and the first supply current is in the abnormal state. According to the power supply device of the fourteenth aspect, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit can suppress an increase in the current supplied to the power supply device by reducing the duty ratio in the pulse width modulation control.

[0019] In a fifteenth aspect power supply device according to the thirteenth or fourteenth aspect of the present disclosure, the control unit is configured to determine whether or not the at least one of the first supply voltage and the first supply current is in an abnormal state based on the at least one of the first supply voltage and the first supply current. According to the power supply device of the fifteenth aspect, the control unit can preferably determine whether or not at least one of the first supply voltage and the first supply current is in an abnormal state, based on at least one of the first supply voltage and the first supply current.

[0020] In a power supply device according to a sixteenth aspect in accordance with any one of the thirteenth to fifteenth aspects of the present disclosure, the abnormal state includes a state in which a voltage distortion of the first supply voltage occurs. According to the power supply device of the sixteenth aspect, when voltage distortion occurs in the first supply voltage, the control unit can suitably control the current supplied to the power supply device by controlling the second switching element.

[0021] In a power supply device of a 17th aspect according to any one of the 13th to 16th aspects of the present disclosure, the power supply device further includes an alarm unit capable of notifying a user, and the control unit is configured to control the alarm unit to notify the user that the at least one of the first supply voltage and the first supply current is in the abnormal state when the at least one of the first supply voltage and the first supply current is in the abnormal state. According to the power supply device of the seventeenth aspect, the notification section allows a user to know that at least one of the first supply voltage and the first supply current is in an abnormal state.

[0022] A power supply device according to an eighteenth aspect of the present disclosure is a power supply device that supplies power to a powered unit, and includes a rectifier unit configured to convert a first supply power supplied from an AC power source from AC to DC, a power conversion unit configured to convert a second supply voltage of a second supply power supplied from the rectifier unit or to convert the second supply power from DC to AC, and a control unit configured to control the rectifier unit and the power conversion unit, wherein the rectifier unit has a first switching element, and the control unit is configured to control the rectifier unit to stop operation of the first switching element and to control the power conversion unit so that the first supply current decreases when at least one of a first supply voltage of the first supply power and a first supply current of the first supply power is in an abnormal state. According to the power supply device of the eighteenth aspect, the control unit can preferably control the current supplied to the power supply device by controlling the rectification unit and the power conversion unit based on at least one of the first supply voltage and the first supply current.

[0023] A power supply device according to a nineteenth aspect according to any one of the first to eighteenth aspects of the present disclosure, further comprising a detection unit configured to detect the at least one of the first supply current and the first supply voltage. According to the power supply device of the nineteenth aspect, at least one of the first supply current and the first supply voltage can be detected by the detection section.

[0024] In a power supply device of a twentieth aspect according to any one of the first to third and fifth to eighteenth aspects of the present disclosure, the power-supplied unit includes a power storage unit, and the power conversion unit is configured to supply power to the power storage unit. According to the power supply device of the twentieth aspect, the control unit can suitably control the current supplied to the power supply device including the power conversion unit that supplies power to the power storage unit.

[0025] A power supply device according to a twenty-first aspect of the present disclosure, the power supply device being for a human-powered vehicle. According to the power supply device of the twenty-first aspect, it is possible to suitably control the current supplied to the power supply device including the power conversion unit that supplies power to the power-supplied unit of the human-powered vehicle. Effect of the Invention

[0026] The power supply device of the present disclosure can suitably control the current supplied to the power supply device. [Brief description of the drawings]

[0027] [Figure 1] 1 is a block diagram showing an electrical configuration of a power supply device according to a first embodiment. [Diagram 2] 2 is a block diagram showing an electrical configuration of a rectification unit shown in FIG. 1. [Diagram 3] 4 is a graph showing an example of waveforms of a first supply current and a first supply voltage of a first supply power supplied from the AC power supply of FIG. 1 to the power supply device. [Figure 4] 4 is a graph showing an example of a waveform of a first supply voltage of a first supply power supplied from the AC power supply of FIG. 1 to the power supply device. [Diagram 5] 2 is a flowchart of a process executed by a first control unit in FIG. [Figure 6] 2 is a flowchart of a process executed by a second control unit in FIG. 1. [Figure 7] 4 is a timing chart showing an example of changes over time in a first supply voltage, an amplitude of a first supply current, and a duty ratio in pulse width modulation control by a second switching element in the power supply device of FIG. [Figure 8] 10 is a flowchart of a process executed by a first control unit in the second embodiment. [Figure 9] 13 is a flowchart of a process executed by a control unit according to a third embodiment. [Figure 10] FIG. 11 is a block diagram showing an electrical configuration of a power supply device according to a modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, embodiments of a power supply device according to the present disclosure will be described in detail with reference to the drawings. The power supply device according to the present disclosure is not limited to only the embodiments.

[0029] First Embodiment A power supply device 10 will be described with reference to Fig. 1 to Fig. 7. The power supply device 10 is configured to supply power to at least one of a consumer device to which an AC power source 14 is connected and an industrial device to which the AC power source 14 is connected. The consumer device to which the AC power source 14 is connected is, for example, a human-powered vehicle, an automobile, a motorcycle, a refrigerator, etc. The industrial device to which the AC power source 14 is connected is, for example, a robot, a machine tool, a mounting machine, etc. The power supply device 10 is, for example, a charger, an inverter, or a stabilized power source.

[0030] The power supply device 10 supplies power to the power-receiving unit 12. The power supply device 10 is configured to supply power supplied from, for example, an AC power source 14 to the power-receiving unit 12. The AC power source 14 is configured, for example, separately from the power supply device 10. The AC power source 14 may be included in the power supply device 10. The AC power source 14 is, for example, a commercial power source. The AC power source 14 may be a single-phase AC power source or a three-phase AC power source. In the following, the AC power source 14 will be described as a single-phase AC power source.

[0031] The power supplied unit 12 consumes or stores the power supplied from the power supply device 10, for example. The power supplied unit 12 of this embodiment is configured to be mountable on, for example, a human-powered vehicle. The power supplied unit 12 of this embodiment is used, for example, when the human-powered vehicle is traveling and / or when the human-powered vehicle is undergoing maintenance. The power supplied unit 12 is configured to consume or store power when power is supplied from the power supply device 10, for example.

[0032] The power supply receiving unit 12 includes at least one of a motor, an electric circuit, and a power storage unit 12A, for example. When the power supply receiving unit 12 includes a motor or an electric circuit, the power supply device 10 is, for example, an inverter or a stabilized power supply. When the power supply receiving unit 12 includes a power storage unit 12A, the power supply device 10 is, for example, a charger.

[0033] The power supply device 10 is, for example, a power supply device for a human-powered vehicle. The power supply device for a human-powered vehicle supplies power to, for example, a power-supplied unit 12 provided in the human-powered vehicle. Hereinafter, the power supply device 10 will be described as a power supply device for a human-powered vehicle.

[0034] A human-powered vehicle is, for example, a vehicle that has at least one wheel and can be driven at least by human driving force. Human-powered vehicles include various types of bicycles, such as mountain bikes, road bikes, city bikes, cargo bikes, hand bikes, and recumbents. The number of wheels that a human-powered vehicle has is not limited. Human-powered vehicles include, for example, one-wheeled vehicles and vehicles with two or more wheels. Human-powered vehicles are not limited to vehicles that can be driven only by human driving force. Human-powered vehicles include E-bikes that use not only human driving force but also the driving force of an electric motor for propulsion. E-bikes include electrically assisted bicycles whose propulsion is assisted by an electric motor. In the following, in each embodiment, a human-powered vehicle is described as a bicycle.

[0035] The power-receiving unit 12 includes, for example, a power storage unit 12A. The power storage unit 12A is, for example, a battery for a human-powered vehicle. The battery is configured to supply power to, for example, components for the human-powered vehicle. When the power-receiving unit 12 includes a battery, the power supply device 10 is, for example, a charger for the battery.

[0036] At least a part of the power supply device 10 may be provided on a power cable connected to the AC power source 14. When the powered unit 12 includes the power storage unit 12A, at least a part of the power supply device 10 may be provided on a battery. At least a part of the power supply device 10 may be configured separately from the power cable and the battery. When at least a part of the power supply device 10 is configured separately from the power cable and the battery, the power supply device 10 may have a housing that accommodates at least a part of the power supply device 10.

[0037] 1 and 2, the power supply device 10 includes, for example, a rectifier 16 and a control unit 18. The power supply device 10 further includes, for example, a power conversion unit 20. The power supply device 10 includes, for example, the rectifier 16, the power conversion unit 20, and the control unit 18.

[0038] The rectifier 16, the controller 18, and the power converter 20 are provided, for example, in a housing of the power supplying device 10. The power converter 20 may be provided in a housing of the powered unit 12. When the power converter 20 is provided in the housing of the powered unit 12, the rectifier 16 and the controller 18 are provided in the housing of the power supplying device 10.

[0039] The rectifier unit 16 is supplied with a first supply power from, for example, the AC power supply 14. The current of the first supply power is a first supply current. The voltage of the first supply power is a first supply voltage. The first supply power is represented by, for example, a value obtained by multiplying the first supply voltage and the first supply current.

[0040] The rectifier unit 16 is configured to convert the first supply power supplied from the AC power supply 14 from AC to DC. The rectifier unit 16 is, for example, a rectifier. The rectifier unit 16 includes, for example, an AC / DC conversion circuit. The rectifier unit 16 of this embodiment includes a PFC (Power Factor Correction) circuit. The PFC circuit may be of a single type or an interleaved type. The PFC circuit may be a totem-pole bridgeless PFC circuit.

[0041] 2, the rectifier unit 16 includes, for example, a bridge diode 22. The bridge diode 22 converts, for example, the first supply power from AC to DC. The bridge diode 22 is, for example, a general rectifier diode having a PN junction.

[0042] The bridge diode 22 includes, for example, a first diode 22A, a second diode 22B, a third diode 22C, and a fourth diode 22D. For example, the anode terminal of the first diode 22A and the cathode terminal of the second diode 22B are connected. A portion where the anode terminal of the first diode 22A and the cathode terminal of the second diode 22B are connected is defined as, for example, a terminal L1. For example, one end of the AC power supply 14 is connected to the terminal L1. For example, the anode terminal of the third diode 22C and the cathode terminal of the fourth diode 22D are connected. A portion where the anode terminal of the third diode 22C and the cathode terminal of the fourth diode 22D are connected is defined as, for example, a terminal N1. For example, the other end of the AC power supply 14 is connected to the terminal N1.

[0043] For example, the cathode terminal of the first diode 22A and the cathode terminal of the third diode 22C are connected. A portion where the cathode terminal of the first diode 22A and the cathode terminal of the third diode 22C are connected is defined as, for example, a terminal P1. For example, the anode terminal of the second diode 22B and the anode terminal of the fourth diode 22D are connected. A portion where the anode terminal of the second diode 22B and the anode terminal of the fourth diode 22D are connected is defined as, for example, a terminal N2.

[0044] The rectifier unit 16 has an inductor 24. For example, the power output from the bridge diode 22 is input to the inductor 24. For example, the inductor 24 is configured to suppress abrupt current changes.

[0045] The rectifier 16 includes, for example, a diode 26. The diode 26 includes, for example, at least one of a fast recovery diode (FRD) and a Schottky barrier diode (SBD). The power output from the inductor 24 is input to the diode 26, for example.

[0046] The bridge diode 22 may be omitted. In the case where the bridge diode 22 is omitted, the rectifier unit 16 is configured to convert the first supply power from AC to DC, for example, by the diode 26. The bridge diode 22 may be replaced with a switching element, and the downstream switching element may be omitted.

[0047] The rectification unit 16 has, for example, a first switching element 28. The first switching element 28 includes, for example, at least one of a MOSFET (metal-oxide-semiconductor field-effect transistor) and an IGBT (insulated gate bipolar transistor). The MOSFET may be an N-channel type or a P-channel type. One end of the first switching element 28 is connected, for example, to an anode terminal of the diode 26. One end of the first switching element 28 is electrically connected, for example, to the inductor 24. The rectification unit 16 may have at least one switching element other than the first switching element 28.

[0048] When the first switching element 28 is in the off state, the power output from the inductor 24 is input to, for example, the diode 26. When the first switching element 28 is in the on state, the power output from the inductor 24 is input to, for example, the first switching element 28. The other end of the first switching element 28 is connected to, for example, the terminal N2 of the bridge diode 22.

[0049] The rectification unit 16 includes, for example, a capacitor 30. The capacitor 30 is configured to smooth the power output from the diode 26. The capacitor 30 is disposed, for example, between the diode 26 and the power conversion unit 20 in the power supply path of the power supply device 10.

[0050] The rectifier unit 16 has, for example, a pulse generator 32. The pulse generator 32 is configured to generate, for example, an electrical signal that controls the first switching element 28. The pulse generator 32 is connected to, for example, the first control unit 18A. The pulse generator 32 is configured to generate, for example, an electrical signal that controls the first switching element 28 in response to an electrical signal from the first control unit 18A. The pulse generator 32 may be omitted. When the pulse generator 32 is omitted, the function of the pulse generator 32 may be included in the first control unit 18A.

[0051] The power conversion unit 20 is configured to supply power to the power supplied unit 12, for example. The power conversion unit 20 converts the power supplied from the rectification unit 16, for example, so that the power becomes suitable for the power supplied unit 12. When the power supplied unit 12 includes the power storage unit 12A, the power conversion unit 20 is configured to supply power to the power storage unit 12A. The power conversion unit 20 converts the power supplied from the rectification unit 16, for example, so that the power becomes suitable for storage in the power storage unit 12A.

[0052] The power conversion unit 20 is supplied with the second supply power from the rectification unit 16. The current of the second supply power is the second supply current. The voltage of the second supply power is the second supply voltage. The second supply power is represented by, for example, a value obtained by multiplying the second supply voltage and the second supply current.

[0053] The power conversion unit 20 is configured, for example, to convert the second supply voltage of the second supply power supplied from the rectification unit 16, or to convert the second supply power from direct current to alternating current. When the power supply device 10 is a charger or a stabilized power supply, the power conversion unit 20 is configured, for example, to convert the second supply voltage of the second supply power supplied from the rectification unit 16. When the power conversion unit 20 converts the second supply voltage of the second supply power supplied from the rectification unit 16, the power conversion unit 20 includes, for example, a DC / DC conversion circuit. The power conversion unit 20 converts the second supply voltage, for example, to convert the second supply voltage of the second supply power supplied from the rectification unit 16 to a predetermined voltage. The predetermined voltage is, for example, a voltage suitable for the power supplied unit 12. The predetermined voltage is, for example, smaller than the second supply voltage. The predetermined voltage may be equal to or greater than the second supply voltage.

[0054] When the power supply device 10 is an inverter, the power conversion unit 20 is configured to convert the second supply power from DC to AC, for example. When the power conversion unit 20 is configured to convert the second supply power from DC to AC, the power conversion unit 20 includes an inverter circuit. The inverter circuit may be, for example, a drive circuit for a motor.

[0055] The power conversion unit 20 has, for example, a second switching element 36 that operates to convert the second supply voltage. The power conversion unit 20 performs conversion of the second supply voltage or conversion of the second supply power from DC to AC by, for example, switching between an on state and an off state of the second switching element 36. The power conversion unit 20 converts the second supply voltage to a predetermined voltage in accordance with, for example, the switching operation of the second switching element 36.

[0056] The control unit 18 includes, for example, an arithmetic processing device that executes a predetermined control program. The arithmetic processing device includes, for example, a CPU (Central Processing Unit) or an MPU (Micro Processing Unit). The control unit 18 may include one or more microcomputers. The control unit 18 may include a plurality of arithmetic processing devices that are arranged at a plurality of locations. The control unit 18 is supplied with power, for example, from the AC power source 14. In this embodiment, the control unit 18 is supplied with power obtained by converting the power of the AC power source 14 into DC. The control unit 18 may be configured to be supplied with power from a power source other than the AC power source 14.

[0057] The control unit 18 is configured to control, for example, the rectification unit 16. The control unit 18 includes, for example, a first control unit 18A. The first control unit 18A is configured to control, for example, the rectification unit 16. The first control unit 18A is provided, for example, on the same circuit board as the rectification unit 16 or in the vicinity of the rectification unit 16. The first control unit 18A includes, for example, an arithmetic processing unit that executes a predetermined control program. The arithmetic processing unit includes, for example, a CPU or an MPU. The first control unit 18A may include one or more microcomputers. The first control unit 18A may include multiple arithmetic processing units that are arranged separately at multiple locations.

[0058] The control unit 18 is configured to control, for example, the power conversion unit 20. The control unit 18 includes, for example, a second control unit 18B. The second control unit 18B is configured to control, for example, the power conversion unit 20. The second control unit 18B is provided, for example, on the same circuit board as the power conversion unit 20 or in the vicinity of the power conversion unit 20. The second control unit 18B includes, for example, an arithmetic processing unit that executes a predetermined control program. The arithmetic processing unit includes, for example, a CPU or an MPU. The second control unit 18B may include one or more microcomputers. The second control unit 18B may include multiple arithmetic processing units that are arranged separately at multiple locations.

[0059] At least a part of the first control unit 18A may be provided integrally with the second control unit 18B. The entire first control unit 18A may be provided integrally with the second control unit 18B. At least a part of the second control unit 18B may be provided integrally with the first control unit 18A. The entire second control unit 18B may be provided integrally with the first control unit 18A.

[0060] The power supply device 10 further includes, for example, a storage unit 40. The storage unit 40 stores, for example, a control program and information used in the control process. The storage unit 40 includes, for example, at least one of a nonvolatile memory and a volatile memory. The nonvolatile memory includes, for example, at least one of a Read-Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), and a flash memory. The volatile memory includes, for example, a Random Access Memory (RAM). The storage unit 40 is connected to, for example, the control unit 18 in a wired or wireless manner so as to be able to communicate with the control unit 18.

[0061] The storage unit 40 includes a first storage unit 40A. The first storage unit 40A is provided, for example, on the same circuit board as the rectification unit 16 or in the vicinity of the rectification unit 16. The first storage unit 40A is connected, for example, to the first control unit 18A so as to be able to communicate with it by wire or wirelessly. The first storage unit 40A stores, for example, a control program and information used in the control process. The first storage unit 40A stores, for example, information used by the first control unit 18A. The first storage unit 40A includes, for example, at least one of a nonvolatile memory and a volatile memory. The nonvolatile memory includes, for example, at least one of a ROM, an EPROM, an EEPROM, and a flash memory. The volatile memory includes, for example, a RAM.

[0062] The storage unit 40 includes a second storage unit 40B. The second storage unit 40B is provided, for example, on the same circuit board as the power conversion unit 20 or in the vicinity of the power conversion unit 20. The second storage unit 40B is connected, for example, to the second control unit 18B so as to be able to communicate with it by wire or wirelessly. The second storage unit 40B stores, for example, a control program and information used in the control process. The second storage unit 40B stores, for example, information used by the first control unit 18A. The second storage unit 40B includes, for example, at least one of a nonvolatile memory and a volatile memory. The nonvolatile memory includes, for example, at least one of a ROM, an EPROM, an EEPROM, and a flash memory. The volatile memory includes, for example, a RAM.

[0063] At least a part of the first storage unit 40A may be provided integrally with the second storage unit 40B. The entirety of the first storage unit 40A may be provided integrally with the second storage unit 40B. At least a part of the second storage unit 40B may be provided integrally with the first storage unit 40A. The entirety of the second storage unit 40B may be provided integrally with the first storage unit 40A.

[0064] The control unit 18 is configured to control the rectification unit 16 and the power conversion unit 20. The first control unit 18A is configured to control, for example, the rectification unit 16. The second control unit 18B is configured to control, for example, the power conversion unit 20.

[0065] The power supply device 10 further includes a detection unit 38 configured to detect at least one of the first supply current and the first supply voltage. The detection unit 38 is provided, for example, between the AC power source 14 and the rectification unit 16 in the power supply path of the power supply device 10. The detection unit 38 is provided, for example, between the AC power source 14 and the diode 26 in the power supply path of the power supply device 10.

[0066] The detection unit 38 is electrically connected to the control unit 18, for example, by a signal line 42. The detection unit 38 is electrically connected to at least one of the first control unit 18A and the second control unit 18B, for example, by a signal line 42. The detection unit 38 is connected only to the first control unit 18A, for example, by the signal line 42.

[0067] The detection unit 38 includes, for example, a voltage sensor 38A. The voltage sensor 38A detects, for example, a voltage between the AC power supply 14 and the rectification unit 16 in the power supply path of the power supply device 10. The voltage sensor 38A detects, for example, a first supply voltage. The signal line 42 includes, for example, a first signal line 42A. The voltage sensor 38A is electrically connected to the first control unit 18A by, for example, the first signal line 42A. To the first control unit 18A, for example, an output signal detected by the voltage sensor 38A is output.

[0068] The detection unit 38 includes, for example, a current sensor 38B. The current sensor 38B detects, for example, a current between the AC power supply 14 and the rectifier unit 16 in the power supply path of the power supply device 10. The current sensor 38B detects, for example, a first supply current. The signal line 42 includes, for example, a second signal line 42B. The current sensor 38B is electrically connected to the first control unit 18A by, for example, the second signal line 42B. To the first control unit 18A, for example, an output signal detected by the current sensor 38B is output.

[0069] The first control unit 18A calculates a first supply voltage, for example, by an analog signal transmitted from a voltage sensor 38A. The first control unit 18A calculates a first supply current, for example, by an analog signal transmitted from a current sensor 38B. The first control unit 18A is electrically connected to, for example, the second control unit 18B. The first control unit 18A is configured to transmit the calculation results of the first supply voltage and the first supply current to, for example, the second control unit 18B.

[0070] The voltage sensor 38A may include an analog-to-digital conversion circuit. When the voltage sensor 38A includes an analog-to-digital conversion circuit, the first controller 18A calculates the first supply voltage, for example, by a digital signal transmitted from the voltage sensor 38A.

[0071] The current sensor 38B may include an analog-to-digital conversion circuit. When the current sensor 38B includes an analog-to-digital conversion circuit, the first controller 18A calculates the first supply voltage, for example, by a digital signal transmitted from the current sensor 38B.

[0072] The voltage sensor 38A and the current sensor 38B may be connected only to the second controller 18B. When the voltage sensor 38A and the current sensor 38B are connected only to the second controller 18B, the second controller 18B calculates the first supply voltage, for example, by a signal transmitted from the voltage sensor 38A. When the voltage sensor 38A and the current sensor 38B are connected only to the second controller 18B, the second controller 18B calculates the first supply current, for example, by a signal transmitted from the current sensor 38B. When the voltage sensor 38A and the current sensor 38B are connected only to the second controller 18B, the second controller 18B is configured to transmit the calculation results of the first supply voltage and the first supply current to the first controller 18A, for example.

[0073] The control unit 18 is configured to control, for example, the first switching element 28. The control unit 18 is configured to execute PFC control, for example, by the first switching element 28. The control unit 18 is configured to control the first switching element 28 based on at least one of the first supply voltage and the first supply current, for example, in the PFC control, so that a phase shift between a current and a voltage on the output side of the first switching element 28 is suppressed. The control unit 18 can improve the power factor of the AC power supply 14, for example, by the PFC control.

[0074] The first control unit 18A is configured to control, for example, the first switching element 28. The first control unit 18A is configured to execute PFC control by, for example, the first switching element 28. The first control unit 18A is configured to control the first switching element 28 based on at least one of a first supply voltage and a first supply current in the PFC control so that a phase shift between a current and a voltage on the output side of the first switching element 28 is suppressed. The first control unit 18A can improve the power factor of the AC power supply 14 by, for example, the PFC control.

[0075] Fig. 3 shows example waveforms of the first supply voltage and the first supply current. When the first control unit 18A does not perform PFC control, the waveform of the first supply current is not a sine wave but a harmonic wave, as shown by the two-dot chain line in Fig. 3. Therefore, when the first control unit 18A does not perform PFC control, the phase lag between the first supply current and the first supply voltage is large, and the power factor is low.

[0076] When the first control unit 18A performs PFC control, the waveform of the first supply current approaches a sine wave, as shown by the solid line in Fig. 3. When the first control unit 18A performs PFC control, the first supply current has lower harmonics than when the first control unit 18A does not perform PFC control. Therefore, by the first control unit 18A performing PFC control, the phase delay between the first supply current and the first supply voltage is reduced, and the power factor is improved compared to when the first control unit 18A does not perform PFC control.

[0077] The control unit 18 is configured to control the power conversion unit 20 based on, for example, at least one of a first supply voltage of the first supply power and a first supply current of the first supply power. The first control unit 18A is configured to control the power conversion unit 20 based on, for example, at least one of the first supply voltage of the first supply power and the first supply current of the first supply power.

[0078] The control unit 18 is configured to control the power conversion unit 20, for example, when at least one of the first supply voltage and the first supply current is in an abnormal state. The determination of the abnormal state is executed, for example, by the first control unit 18A. The first control unit 18A is configured to control the power conversion unit 20, for example, when at least one of the first supply voltage and the first supply current is in an abnormal state. The detection unit 38 is configured to be able to detect, for example, a parameter reflecting the abnormal state. The control unit 18 is configured to determine the abnormal state according to, for example, an output of the detection unit 38. The parameter reflecting the abnormal state is, for example, the first supply voltage.

[0079] The control unit 18 is configured to determine whether or not at least one of the first supply voltage and the first supply current is in an abnormal state based on at least one of the first supply voltage and the first supply current. The abnormal state includes, for example, a state in which voltage distortion of the first supply voltage occurs. The voltage distortion includes, for example, at least one of voltage fluctuation, generation of harmonics, momentary interruption, and momentary voltage drop.

[0080] 4 shows an example of a waveform of the first supply voltage without voltage distortion and an example of a waveform of the first supply voltage with voltage distortion. When there is no voltage distortion in the first supply voltage, the waveform of the first supply voltage is represented by a fundamental wave. The fundamental wave is, for example, a sine wave. When there is voltage distortion in the first supply voltage, the waveform of the first supply voltage is, for example, represented by a waveform in which one or more harmonics are superimposed on the fundamental wave.

[0081] The control unit 18 is configured to determine whether at least one of the first supply voltage and the first supply current is in an abnormal state based on, for example, the distortion rate of the first supply voltage. The control unit 18 may be configured to determine the voltage distortion by comparing the first supply voltage with a reference voltage stored in the storage unit 40. The control unit 18 is configured to determine that the voltage distortion of the first supply voltage has occurred, for example, when the distortion rate of the first supply voltage is equal to or greater than the distortion rate of the reference voltage. The distortion rate is, for example, the ratio of the sum of the effective values ​​of all harmonic components of the first supply voltage to the effective value of the fundamental wave of the first supply voltage.

[0082] The control unit 18 may be configured to determine whether at least one of the first supply voltage and the first supply current is in an abnormal state based on both the first supply voltage and the first supply current. The control unit 18 may be configured to determine that voltage distortion is occurring based on both the first supply voltage and the first supply current. The control unit 18 determines that voltage distortion is occurring, for example, when the voltage distortion rate of the first supply voltage is equal to or greater than a predetermined distortion rate and the first supply current satisfies a determination condition. The determination condition is satisfied in at least one of the following cases: when the peak value of the first supply current is equal to or greater than a predetermined current threshold, and when the first supply current continues to be equal to or less than the predetermined current threshold.

[0083] The first control unit 18A is configured to transmit a first determination result to the second control unit 18B when it is determined that at least one of the first supply voltage and the first supply current is not in an abnormal state, for example. When the first control unit 18A is configured to determine an abnormal state based on the first supply voltage and not based on the first supply current, the first control unit 18A determines that at least one of the first supply voltage and the first supply current is not in an abnormal state, for example, when the first supply voltage is in a normal state. When the first control unit 18A is configured to determine an abnormal state based on the first supply current and not based on the first supply voltage, the first control unit 18A determines that at least one of the first supply voltage and the first supply current is not in an abnormal state, for example, when the first supply current is in a normal state. When the first control unit 18A is configured to determine an abnormal state based on both the first supply voltage and the first supply current, the first control unit 18A determines that at least one of the first supply voltage and the first supply current is not in an abnormal state, for example, when the first supply voltage is in a normal state and the first supply current is in a normal state. If the first supply voltage is in a normal state, the first control unit 18A may determine that at least one of the first supply voltage and the first supply current is not in an abnormal state regardless of the state of the first supply current or without determining the state of the first supply current. The first control unit 18A is configured to transmit a second determination result to the second control unit 18B, for example, when it is determined that at least one of the first supply voltage and the first supply current is in an abnormal state.

[0084] The first control unit 18A is configured to transmit a second determination result to the second control unit 18B when it is determined that at least one of the first supply voltage and the first supply current is in an abnormal state based on, for example, the calculation results of the first supply voltage and the first supply current. In a case where the voltage sensor 38A and the current sensor 38B are connected only to the second control unit 18B, the second control unit 18B is configured to transmit a second determination result to the first control unit 18A when it is determined that at least one of the first supply voltage and the first supply current is in an abnormal state based on, for example, the calculation results of the first supply voltage and the first supply current.

[0085] The control unit 18 is configured, for example, to control the second switching element 36. The control unit 18 is configured, for example, to control the second switching element 36 based on at least one of the first supply voltage and the first supply current. The control unit 18 is configured, for example, to control the second switching element 36 such that the first supply current is reduced when at least one of the first supply voltage and the first supply current is in an abnormal state.

[0086] The second control unit 18B is configured, for example, to control the second switching element 36. The second control unit 18B is configured, for example, to control the second switching element 36 based on at least one of the first supply voltage and the first supply current. The second control unit 18B is configured, for example, to control the second switching element 36 so that the first supply current is reduced when at least one of the first supply voltage and the first supply current is in an abnormal state.

[0087] The second control unit 18B is configured to control the second switching element 36 in accordance with the first and second determination results transmitted from the first control unit 18A, for example. The second control unit 18B is configured to control the second switching element 36 such that, when the second determination result is received, the first supply current is lower than when the first determination result is received.

[0088] The control unit 18 is configured to execute pulse width modulation control by the second switching element 36, for example. The control unit 18 is configured to convert the power supplied from the power conversion unit 20 to the power supply unit 12, for example, by changing the duty ratio in the pulse width modulation control. The control unit 18 is configured to control the second switching element 36 to lower the duty ratio in the pulse width modulation control, for example, when at least one of the first supply voltage and the first supply current is in an abnormal state. The control unit 18 is configured to control the second switching element 36 to lower the duty ratio in the pulse width modulation control, for example, when at least one of the first supply voltage and the first supply current is in an abnormal state, compared to when at least one of the first supply voltage and the first supply current is not in an abnormal state. The duty ratio is, for example, the ratio of the first period to the total period of the first period and the second period. The first period is, for example, a period during which the second switching element 36 is in an on state. The second period is, for example, a period during which the second switching element 36 is in an off state. Hereinafter, pulse width modulation control will be referred to as PWM (Pulse Width Modulation) control.

[0089] The control of the second switching element 36 is executed by the second control unit 18B. The second control unit 18B is configured, for example, to execute PWM control by the second switching element 36. The second control unit 18B is configured, for example, to convert the power supplied from the power conversion unit 20 to the power supplied unit 12 by changing the duty ratio in the PWM control. The second control unit 18B is configured, for example, to control the second switching element 36 so as to reduce the duty ratio in the PWM adjustment control when at least one of the first supply voltage and the first supply current is in an abnormal state.

[0090] The second control unit 18B is configured to control the second switching element 36 so that the duty ratio in the PWM control becomes the first duty ratio when, for example, at least one of the first supply voltage and the first supply current is not in an abnormal state. The second control unit 18B is configured to control the second switching element 36 so that the duty ratio in the PWM control becomes the second duty ratio when, for example, at least one of the first supply voltage and the first supply current is in an abnormal state. The first duty ratio is, for example, larger than the second duty ratio.

[0091] For example, when the second control unit 18B receives a first determination result from the first control unit 18A, the second control unit 18B is configured to control the second switching element 36 to supply first output power to the power supply unit 12. For example, when the second control unit 18B receives a second determination result from the first control unit 18A, the second control unit 18B is configured to control the second switching element 36 to supply second output power to the power supply unit 12.

[0092] The first output power is, for example, a power when the duty ratio in the PWM control is a first duty ratio. The second output power is, for example, a power when the duty ratio in the PWM control is a second duty ratio. The first output power is, for example, greater than the second output power.

[0093] For example, when at least one of the first supply voltage and the first supply current is not in an abnormal state, the control unit 18 controls the second switching element 36 so that the amplitude of the first supply current is within the allowable range PR. When at least one of the first supply voltage and the first supply current is in an abnormal state such as voltage distortion, if the control of the second switching element 36 is continued when at least one of the first supply voltage and the first supply current is not in an abnormal state, the amplitude of the first supply current may exceed the allowable range PR. For example, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 controls the second switching element 36 so that the amplitude of the first supply current is within the allowable range PR. For example, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 changes the duty ratio of the PWM control by the second switching element 36 so that the amplitude of the first supply current is within the allowable range PR.

[0094] The power supply device 10 further includes, for example, a notification unit 44 capable of notifying a user. For example, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 is configured to control the notification unit 44 to cause the notification unit 44 to notify the user that at least one of the first supply voltage and the first supply current is in an abnormal state. The notification unit 44 is, for example, electrically connected to the control unit 18.

[0095] The first control unit 18A is configured to, for example, control the notification unit 44 to notify the fact that at least one of the first supply voltage and the first supply current is in an abnormal state when the first supply voltage and the first supply current are in an abnormal state. The notification unit 44 is, for example, electrically connected to the first control unit 18A.

[0096] The notification unit 44 includes, for example, a speaker. When the notification unit 44 includes a speaker, the control unit 18 is configured to notify the user of at least one abnormal state of the first supply voltage and the first supply current, for example, by controlling the notification unit 44 to generate an alarm sound related to the at least one abnormal state of the first supply voltage and the first supply current from the speaker. When the notification unit 44 includes a speaker, the first control unit 18A is configured to notify the user of at least one abnormal state of the first supply voltage and the first supply current, for example, by controlling the notification unit 44 to generate an alarm sound related to the at least one abnormal state of the first supply voltage and the first supply current from the speaker. The alarm sound includes, for example, a voice, a melody, a beep, and the like.

[0097] The notification unit 44 may include a light-emitting unit. The light-emitting unit includes, for example, a light-emitting diode. The control unit 18 is configured to, for example, when at least one of the first supply voltage and the first supply current is in an abnormal state, light the light-emitting unit to notify the user of the abnormal state of at least one of the first supply voltage and the first supply current.

[0098] The notification unit 44 may include a display. The display may include, for example, a liquid crystal display. The display may include a segment display or an organic EL (Electro-Luminescence) display. The control unit 18 is configured to notify a user of at least one abnormal state of the first supply voltage and the first supply current, for example, by displaying notification information on the at least one abnormal state of the first supply voltage and the first supply current on the display. The first control unit 18A is configured to notify a user of at least one abnormal state of the first supply voltage and the first supply current, for example, by displaying notification information on the at least one abnormal state of the first supply voltage and the first supply current on the display. The notification information is displayed by at least one of a graph, a numerical value, a gauge, a character, and light, for example.

[0099] The process executed by the first control unit 18A will be described with reference to Fig. 5. For example, when power is supplied to the first control unit 18A, the first control unit 18A starts the process and proceeds to step S11 of the flowchart shown in Fig. 5. For example, when the flowchart in Fig. 5 ends, the first control unit 18A repeats the process from step S11 after a predetermined period has elapsed until the supply of power is stopped. The abnormal state in Fig. 5 refers to at least one abnormal state of the first supply voltage and the first supply current.

[0100] In step S11, the first control unit 18A acquires the first supply voltage and proceeds to step S12. In step S12, the first control unit 18A determines whether or not at least one of the first supply voltage and the first supply current is in an abnormal state. If at least one of the first supply voltage and the first supply current is in an abnormal state, the first control unit 18A proceeds to step S13. In step S13, the first control unit 18A controls the notification unit 44 to notify that at least one of the first supply voltage and the first supply current is in an abnormal state, and proceeds to step S14. In step S14, the first control unit 18A transmits the second determination result to the second control unit 18B and ends the process.

[0101] If at least one of the first supply voltage and the first supply current is not in an abnormal state in step S12, the first control unit 18A proceeds to step S15. In step S15, the first control unit 18A transmits the first determination result to the second control unit 18B and ends the process.

[0102] The order of steps S13 and S14 may be reversed. When the order of steps S13 and S14 is reversed, the first control unit 18A proceeds to step S14 after the process of step S12. The first control unit 18A proceeds to step S13 after the process of step S14, and ends the process.

[0103] Step S13 may be omitted. When step S13 is omitted, first control unit 18A proceeds to step S14 if at least one of the first supply voltage and the first supply current is in an abnormal state in step S12. Step S15 may be omitted. When step S15 is omitted, first control unit 18A ends the process if at least one of the first supply voltage and the first supply current is not in an abnormal state in step S12. When step S13 is omitted, power supply device 10 may not include notification unit 44.

[0104] A process in which the second control unit 18B controls the second switching element 36 in response to an abnormality in the first supply voltage will be described with reference to Fig. 6. For example, when power is supplied to the second control unit 18B, the second control unit 18B starts the process and proceeds to step S21 of the flowchart shown in Fig. 6. For example, when the flowchart in Fig. 6 ends, the second control unit 18B repeats the process from step S21 after a predetermined period has elapsed until the supply of power is stopped.

[0105] In step S21, the second control unit 18B determines whether or not the first determination result has been received. If the second control unit 18B has received the first determination result, the process proceeds to step S22. In step S22, the second control unit 18B controls the second switching element 36 to supply the first output power to the power supply receiving unit 12, and ends the process.

[0106] If the second control unit 18B does not receive the first judgment result in step S21, it proceeds to step S23. In step S23, the second control unit 18B determines whether or not the second judgment result has been received. If the second control unit 18B does not receive the second judgment result, it ends the process. If the second control unit 18B does not receive both the first judgment result and the second judgment result, it may proceed to step S21. If the second control unit 18B receives the second judgment result, it proceeds to step S24. In step S24, the second control unit 18B controls the second switching element 36 to supply the second output power to the power supply unit 12, and ends the process.

[0107] An example of changes over time in the first supply voltage, the first supply current, and the duty ratio of the PWM control by the second switching element 36 will be described with reference to Fig. 7. The amplitude of the first supply current in Fig. 7 indicates the change over time in the amplitude of the first supply current per period. The two-dot chain line in Fig. 7 indicates the case where the first duty ratio is maintained even if at least one of the first supply voltage and the first supply current is in an abnormal state.

[0108] Time t11 is the time when at least one of the first supply voltage and the first supply current becomes abnormal. Time t11 may be the time when the second control unit 18B receives the second determination result from the first control unit 18A. When the second control unit 18B receives the second determination result from the first control unit 18A, the second control unit 18B controls the second switching element 36 so that the duty ratio becomes the second duty ratio from the first duty ratio after time t11. When the second control unit 18B controls the second switching element 36 so that the duty ratio becomes the second duty ratio from the first duty ratio, the amplitude of the first supply current is maintained within the allowable range PR. As shown by the two-dot chain line in FIG. 7, when the duty ratio is maintained at the first duty ratio after time t11, the amplitude of the first supply current is unlikely to be maintained within the allowable range PR while at least one of the first supply voltage and the first supply current is in the abnormal state.

[0109] Time t12 is the time when the first supply voltage changes to a normal waveform. Time t12 may be the time when the second control unit 18B receives the first determination result from the first control unit 18A. The second control unit 18B controls the second switching element 36 so that the duty ratio changes from the second duty ratio to the first duty ratio at time t12.

[0110] The control unit 18 of the present embodiment can suitably control the current supplied to the power supply device 10 by controlling the power conversion unit 20 based on at least one of the first supply voltage and the first supply current. The current supplied to the power supply device 10 that can be suitably controlled by controlling the power conversion unit 20 includes, for example, the first supply current. The current supplied to the power supply device 10 that can be suitably controlled by controlling the power conversion unit 20 includes, for example, the current supplied to the power supply device 10. The current supplied to the power supply device 10 that can be suitably controlled by controlling the power conversion unit 20 includes, for example, the current supplied from the AC power source 14 to the rectification unit 16.

[0111] When voltage distortion occurs in the AC power supply 14, an excessive current may flow through the rectifier 16. When an excessive current flows through the rectifier 16, an abnormality or a stop of the power supply system may occur. For example, when voltage distortion occurs in the first supply voltage, the second control unit 18B controls the second switching element 36 to reduce the duty ratio in the PWM control, thereby suppressing an increase in the first supply current. Therefore, since excessive current can be suppressed from flowing through the rectifier 16, the power supply device 10 can suppress the occurrence of an abnormality in the entire power supply system and the stop of the entire power supply system due to a protection circuit or the like. Since the power supply device 10 can suppress the stop of the entire power supply system, it can maintain the power supply to the power-receiving unit 12 even when at least one of the first supply voltage and the first supply current is in an abnormal state. When the entire power supply system is stopped due to a protection circuit or the like, a recovery operation is required. Since the power supply device 10 can suppress the stop of the entire power supply system due to a protection circuit or the like, it can contribute to usability.

[0112] <Second embodiment> A power supply device 10 of a second embodiment will be described with reference to Figures 1, 2, and 8. Configurations of the power supply device 10 of the second embodiment that are common to the first embodiment will be denoted by the same reference numerals as in the first embodiment, and duplicated descriptions will be omitted.

[0113] The control unit 18 of the second embodiment is configured to control the rectification unit 16 based on at least one of the first supply voltage and the first supply current. The control unit 18 of the second embodiment is configured to control the rectification unit 16 and the power conversion unit 20 based on at least one of the first supply voltage and the first supply current. The control unit 18 of the second embodiment is configured to control the power conversion unit 20 based on at least one of the first supply voltage and the first supply current, for example, similarly to the first embodiment.

[0114] The control unit 18 is configured to control the rectifier unit 16 so that the operation of the first switching element 28 is stopped or suppressed, for example, based on at least one of the first supply voltage of the first supply power and the first supply current of the first supply power. The control unit 18 is configured to control the first switching element 28 so that the first switching element 28 is turned off when the operation of the first switching element 28 is stopped. The control unit 18 is configured to control the first switching element 28 so that the second supply voltage generated by the rectifier unit 16 is lower than a predetermined voltage, for example, based on at least one of the first supply voltage of the first supply power and the first supply current of the first supply power when the operation of the first switching element 28 is not suppressed. The predetermined voltage is, for example, a voltage that is boosted by PFC control when the operation of the first switching element 28 is not suppressed.

[0115] The control unit 18 is configured, for example, when at least one of the first supply voltage and the first supply current is not in an abnormal state, to control the first switching element 28 based on at least one of the first supply voltage and the first supply current so as to suppress a phase shift between the current and the voltage on the output side of the first switching element 28. The control unit 18 is configured, for example, when at least one of the first supply voltage and the first supply current is not in an abnormal state, to perform PFC control by the first switching element 28. The first control unit 18A is configured, for example, when at least one of the first supply voltage and the first supply current is not in an abnormal state, to perform PFC control by the first switching element 28.

[0116] The control unit 18 is configured to control the rectifier unit 16 so that, for example, when at least one of the first supply voltage and the first supply current is in an abnormal state, the operation of the first switching element 28 is stopped or suppressed. For example, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 stops the PFC control by the first switching element 28.

[0117] The first control unit 18A is configured to control the rectifier unit 16 based on, for example, at least one of the first supply voltage and the first supply current. The first control unit 18A is configured to control the rectifier unit 16 based on, for example, at least one of the first supply voltage of the first supply power and the first supply current of the first supply power so that the operation of the first switching element 28 is stopped or suppressed. The first control unit 18A is configured to control the rectifier unit 16 so that the operation of the first switching element 28 is stopped or suppressed when, for example, at least one of the first supply voltage and the first supply current is in an abnormal state. The first control unit 18A stops the PFC control by the first switching element 28 when, for example, at least one of the first supply voltage and the first supply current is in an abnormal state.

[0118] The control unit 18 is configured, for example, to control the rectification unit 16 to stop operation of the first switching element 28 when at least one of the first supply voltage of the first supply power and the first supply current of the first supply power is in an abnormal state, and to control the power conversion unit 20 to reduce the first supply current.

[0119] When at least one of the first supply voltage and the first supply current is in an abnormal state, the first control unit 18A is configured to control the rectification unit 16 to stop the operation of the first switching element 28, and the second control unit 18B is configured to control the power conversion unit 20 to reduce the first supply current. When at least one of the first supply voltage and the first supply current is in an abnormal state, the first control unit 18A is configured to control the first switching element 28 to stop the operation of the first switching element 28, and the second control unit 18B is configured to control the second switching element 36 to reduce the first supply current.

[0120] The process executed by the first control unit 18A of the second embodiment will be described with reference to Fig. 8. For example, when power is supplied to the first control unit 18A, the first control unit 18A starts the process and proceeds to step S31 of the flowchart shown in Fig. 8. For example, when the flowchart in Fig. 8 ends, the first control unit 18A repeats the process from step S31 after a predetermined period has elapsed until the supply of power is stopped. The abnormal state in Fig. 8 refers to at least one abnormal state of the first supply voltage and the first supply current.

[0121] In step S31, the first control unit 18A acquires the first supply voltage and proceeds to step S32. In step S32, the first control unit 18A determines whether or not at least one of the first supply voltage and the first supply current is in an abnormal state. If it is in an abnormal state, the first control unit 18A proceeds to step S33. In step S33, the first control unit 18A controls the notification unit 44 to cause the notification unit 44 to notify that at least one of the first supply voltage and the first supply current is in an abnormal state, and proceeds to step S34. In step S34, the first control unit 18A controls the first switching element 28 to stop the operation of the first switching element 28, and proceeds to step S35. In step S35, the first control unit 18A transmits the second determination result to the second control unit 18B and ends the process.

[0122] If at least one of the first supply voltage and the first supply current is not in an abnormal state in step S32, the first control unit 18A proceeds to step S36. In step S36, the first control unit 18A transmits the first determination result to the second control unit 18B and ends the process.

[0123] The order of steps S33 to S35 may be reversed. When the order of steps S33 and S34 is reversed, the first control unit 18A proceeds to step S34 after the process of step S32. The first control unit 18A proceeds to step S33 after the process of step S34. The first control unit 18A proceeds to step S35 after the process of step S33, and ends the process.

[0124] When the order of steps S33 and S35 is reversed, the first control unit 18A proceeds to step S35 after the process of step S32. The first control unit 18A proceeds to step S34 after the process of step S35. The first control unit 18A proceeds to step S33 after the process of step S34, and ends the process.

[0125] When the order of steps S34 and S35 is reversed, the first control unit 18A proceeds to step S35 after the process of step S33. After the process of step S35, the first control unit 18A proceeds to step S34 and ends the process.

[0126] Step S33 may be omitted. When step S33 is omitted, first control unit 18A proceeds to step S34 if at least one of the first supply voltage and the first supply current is in an abnormal state in step S32. Step S36 may be omitted. When step S36 is omitted, first control unit 18A ends the process if at least one of the first supply voltage and the first supply current is not in an abnormal state in step S32. When step S33 is omitted, power supply device 10 may not include notification unit 44.

[0127] When at least one of the first supply voltage and the first supply current is in an abnormal state, the first control unit 18A stops the operation of the first switching element 28, and therefore, it is possible to suppress an excessive current from flowing through the first switching element 28. When voltage distortion occurs, the first control unit 18A executes PFC control, which tends to cause the first supply current to become excessive. When at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 of the second embodiment stops PFC control in addition to controlling the power conversion unit 20, and therefore, it is possible to more suitably suppress an excessive current from flowing through the first switching element 28.

[0128] <Third embodiment> A power supply device 10 of a third embodiment will be described with reference to Fig. 9. Configurations of the power supply device 10 of the third embodiment common to the first and second embodiments are given the same reference numerals as those of the first and second embodiments, and duplicated descriptions will be omitted.

[0129] The control unit 18 in the first and second embodiments includes a first control unit 18A configured to control the rectification unit 16 and a second control unit 18B configured to control the power conversion unit 20, while the control unit 18 in the third embodiment is configured such that the first control unit 18A and the second control unit 18B are configured as a single control unit 18.

[0130] The control unit 18 is configured to, for example, when at least one of the first supply voltage and the first supply current is not in an abnormal state, control the first switching element 28 based on at least one of the first supply voltage and the first supply current so as to suppress a phase shift between the current and the voltage on the output side of the first switching element 28, and to control the second switching element 36 to supply the first output power to the power supplied unit 12. For example, when at least one of the first supply voltage and the first supply current is not in an abnormal state, the control unit 18 executes PFC control so as to suppress a phase shift between the current and the voltage on the output side of the first switching element 28.

[0131] The control unit 18 is configured to, for example, control the notification unit 44 to cause the notification unit 44 to notify that at least one of the first supply voltage and the first supply current is in an abnormal state, control the first switching element 28 to stop the operation of the first switching element 28, and control the second switching element 36 to supply a third output power to the power supplied unit 12. The first output power is greater than the third output power. The third output power may be the same as or different from the second output power.

[0132] The process executed by the control unit 18 of the third embodiment will be described with reference to Fig. 9. For example, when power is supplied to the control unit 18, the control unit 18 starts the process and proceeds to step S41 of the flowchart shown in Fig. 9. For example, when the flowchart of Fig. 9 ends, the control unit 18 repeats the process from step S41 after a predetermined period has elapsed until the supply of power is stopped. The abnormal state in Fig. 9 refers to at least one abnormal state of the first supply voltage and the first supply current.

[0133] In step S41, the control unit 18 obtains the first supply voltage, and then proceeds to step S42.

[0134] In step S42, the control unit 18 determines whether or not at least one of the first supply voltage and the first supply current is in an abnormal state. If at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 proceeds to step S43. In step S43, the control unit 18 controls the notification unit 44 to cause the notification unit 44 to notify that at least one of the first supply voltage and the first supply current is in an abnormal state, and proceeds to step S44. In step S44, the control unit 18 controls the first switching element 28 to stop the operation of the first switching element 28, and proceeds to step S45. In step S45, the control unit 18 controls the second switching element 36 to supply the third output power to the power supply unit 12, and ends the process.

[0135] If at least one of the first supply voltage and the first supply current is not in an abnormal state in step S42, the control unit 18 proceeds to step S46. In step S46, the control unit 18 controls the first switching element 28 based on at least one of the first supply voltage and the first supply current so as to suppress a phase shift between the current and the voltage on the output side of the first switching element 28, and proceeds to step S47. In step S47, the control unit 18 controls the second switching element 36 to supply the first output power to the power supplied unit 12, and ends the process.

[0136] Step S43 may be omitted. When step S43 is omitted, if at least one of the first supply voltage and the first supply current is in an abnormal state in step S42, control unit 18 proceeds to step S44. When step S43 is omitted, power supply device 10 may not include notification unit 44.

[0137] <Example of change> The description of each embodiment is merely an example of a form that the power supply device can take, and is not intended to limit the form. The power supply device according to the present disclosure may take a form that is a combination of at least two mutually compatible modified examples, or modified examples of the following embodiments. In the following modified examples, the same reference numerals as those in the respective embodiments are used for the parts that are common to the respective embodiments, and the description thereof is omitted.

[0138] As shown in FIG. 10, the power supply device 10 may further include an additional detector 46 for detecting at least one of the second supply current and the second supply voltage. In this modification, the first control unit 18A is configured to execute PFC control in response to an output of the additional detector 46, for example. The additional detector 46 is provided, for example, between the rectifier 16 and the power converter 20 in the power supply path of the power supply device 10. The additional detector 46 is provided, for example, between the bridge diode 22 and the power converter 20 in the power supply path of the power supply device 10. The additional detector 46 includes, for example, an additional voltage sensor 46A. The additional voltage sensor 46A detects, for example, a voltage between the bridge diode 22 and the power converter 20 in the power supply path of the power supply device 10. The additional detector 46 includes, for example, an additional current sensor 46B. The additional current sensor 46B detects a current between the bridge diode 22 and the power conversion unit 20 in the power supply path of the power supply device 10, for example.

[0139] The control unit 18 may be configured to determine that a voltage distortion has occurred based on the first supply current. When the control unit 18 is configured to determine that a voltage distortion has occurred based on the first supply current, the parameter reflecting at least one abnormal state of the first supply voltage and the first supply current is, for example, the first supply current. The memory unit 40 stores, for example, a predetermined current that is the first supply current corresponding to a case where a voltage distortion occurs. The control unit 18 is configured to determine that a voltage distortion of the first supply voltage has occurred when, for example, the first supply current corresponds to the predetermined current. The predetermined current is, for example, a state in which the first supply current is a reference current that continues for a predetermined period. The reference current is, for example, 0 A. When an instantaneous interruption occurs as part of the voltage distortion, the first supply current continues to be a reference current that continues for a predetermined period, so that the voltage distortion can be determined by the first supply current.

[0140] The control unit 18 may be configured to determine that at least one of the first supply voltage and the first supply current is in an abnormal state based on both the first supply power and the output power of the power conversion unit 20. When the control unit 18 is configured to determine that at least one of the first supply voltage and the first supply current is in an abnormal state based on both the first supply power and the output power of the power conversion unit 20, the detection unit 38 is configured to detect the output voltage of the power conversion unit 20 and the output current of the power conversion unit 20. When the control unit 18 determines that at least one of the first supply voltage and the first supply current is in an abnormal state based on both the first supply power and the output power of the power conversion unit 20, the parameters reflecting the abnormal state of at least one of the first supply voltage and the first supply current include the first supply voltage, the first supply current, the output voltage of the power conversion unit 20, and the output current of the power conversion unit 20. The control unit 18 is configured to calculate the output power of the power conversion unit 20 by multiplying, for example, the output voltage of the power conversion unit 20 and the output current of the power conversion unit 20. The control unit 18 is configured to estimate the output power of the power conversion unit 20 based on, for example, the first supply power. The control unit 18 determines that a voltage distortion has occurred when, for example, the output power of the power conversion unit 20 becomes greater than the output power of the power conversion unit 20 estimated based on the first supply power.

[0141] In the second and third embodiments, the control unit 18 may be configured to control the rectifier unit 16 so that the operation of the first switching element 28 is suppressed when at least one of the first supply voltage and the first supply current is in an abnormal state. For example, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 controls the rectifier unit 16 to suppress the operation of the first switching element 28 so that the first supply current decreases. For example, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 controls the rectifier unit 16 to suppress the operation of the first switching element 28 so that the ratio of the second supply voltage to the first supply voltage decreases. Suppressing the operation of the first switching element 28 means, for example, lowering the duty ratio of the first switching element 28. Suppressing the operation of the first switching element 28 means, for example, lowering the second supply voltage generated by the rectifier unit 16 to a value lower than when the operation of the first switching element 28 is not suppressed by changing the duty ratio. For example, when at least one of the first supply voltage and the first supply current is in an abnormal state, the control unit 18 reduces the duty ratio of the first switching element 28 so that the ratio of the second supply voltage to the first supply voltage decreases.

[0142] The control unit 18 is configured to control the second switching element 36 so that the first supply current drops to 0V when at least one of the first supply voltage and the first supply current is in an abnormal state. When controlling the second switching element 36 so that the first supply current drops to 0V, the duty ratio may be set to 0, and the operation of the second switching element 36 may be stopped. In this modification, the supply of power to the powered unit 12 is stopped, but the entire power supply system including the power supply device 10 can be prevented from being stopped due to a protection circuit or the like. Therefore, when at least one of the first supply voltage and the first supply current goes from an abnormal state to a non-abnormal state, the supply of power to the powered unit 12 can be resumed early.

[0143] If the powered unit 12 includes a motor, and if at least one of the first supply voltage and the first supply current is in an abnormal state, the power supply device 10 may be configured to reduce the first supply current by reducing the rotational speed of the motor.

[0144] The control unit 18 may be configured to control the second switching element 36 so that the first supply current increases when at least one of the first supply voltage and the first supply current is in an abnormal state. When the abnormal state of at least one of the first supply voltage and the first supply current is such that the output power of the power conversion unit 20 is smaller than the output power of the power conversion unit 20 estimated based on the first supply power, the control unit 18 can increase the first supply current by controlling the second switching element 36 so that the first supply current increases. Therefore, the control unit 18 can maintain the output power of the power conversion unit 20, so that the power supply device 10 can suitably control the current supplied to the power supply device 10 even in this modification.

[0145] The control unit 18 of the second embodiment may be configured not to control the power conversion unit 20 based on at least one of the first supply voltage and the first supply current, for example. In this modification, the first control unit 18A does not perform PFC control, so that the first supply current is unlikely to become excessive due to PFC control. Therefore, the power supply device 10 can suitably control the current supplied to the power supply device 10.

[0146] The term "at least one" as used herein means "one or more" of the desired options. As an example, the term "at least one" as used herein means "only one option" or "both of two options" if the number of options is two. As another example, the term "at least one" as used herein means "only one option" or "any combination of two or more options" if the number of options is three or more.

[0147] As used in this specification, ordinal numbers such as "first, second, and third" are used merely to distinguish between multiple elements having the same name and do not have any special meaning. [Explanation of symbols]

[0148] 10...power supply device, 12...powered portion, 12A...power storage portion, 14...AC power source, 16...rectification portion, 18...control portion, 20...power conversion portion, 28...first switching element, 36...second switching element, 38...detection portion, 44...alarm portion.

Claims

1. A power supply device for supplying power to a powered unit, a rectification unit configured to convert a first supply power supplied from an AC power source from AC to DC; a power conversion unit configured to convert a second supply voltage of a second supply power provided by the rectification unit or to convert the second supply power from direct current to alternating current; A control unit configured to control the power conversion unit, A power supply device, wherein the control unit is configured to control the power conversion unit based on at least one of a first supply voltage of the first supply power and a first supply current of the first supply power.

2. The power supply apparatus of claim 1 , wherein the controller is configured to control the rectifier based on the at least one of the first supply voltage and the first supply current.

3. the rectification unit includes a first switching element, The power supply device according to claim 2 , wherein the control unit is configured to control the first switching element.

4. A power supply device for supplying power to a powered unit, a rectification unit configured to convert a first supply power supplied from an AC power source from AC to DC; A control unit configured to control the rectification unit, the rectification unit includes a first switching element, A power supply device, wherein the control unit is configured to control the rectification unit so that operation of the first switching element is stopped or suppressed based on at least one of a first supply voltage of the first supply power and a first supply current of the first supply power.

5. a power conversion unit configured to convert a second supply voltage of the second supply power supplied from the rectification unit or to convert the second supply power from direct current to alternating current; The power supply apparatus of claim 4 , wherein the control unit is configured to control the power conversion unit based on the at least one of the first supply voltage and the first supply current.

6. 6. The power supply device according to claim 3, wherein the control unit is configured to control the rectification unit such that operation of the first switching element is stopped or suppressed when the at least one of the first supply voltage and the first supply current is in an abnormal state.

7. 7. The power supply device according to claim 6, wherein the control unit is configured to control the first switching element based on the at least one of the first supply voltage and the first supply current so as to suppress a phase shift between a current and a voltage on an output side of the first switching element when the at least one of the first supply voltage and the first supply current is not in the abnormal state.

8. 7. The power supply device of claim 6, wherein the control unit is configured to determine whether the at least one of the first supply voltage and the first supply current is in the abnormal state based on the at least one of the first supply voltage and the first supply current.

9. The power supply apparatus of claim 6 , wherein the abnormal condition includes a condition in which a voltage distortion of the first supply voltage occurs.

10. Further comprising a notification unit capable of notifying a user, 7. The power supply device according to claim 6, wherein the control unit is configured to control the notification unit to notify the user that the at least one of the first supply voltage and the first supply current is in the abnormal state when the at least one of the first supply voltage and the first supply current is in the abnormal state.

11. the power conversion section includes a second switching element operable to convert the second supply voltage; The power supply device according to claim 1 or 5, wherein the control unit is configured to control the second switching element.

12. The power supply apparatus of claim 11 , wherein the controller is configured to control the second switching element based on the at least one of the first supply voltage and the first supply current.

13. 13. The power supply device of claim 12, wherein the controller is configured to control the second switching element such that the first supply current decreases when the at least one of the first supply voltage and the first supply current is in an abnormal state.

14. The control unit is configured to perform pulse width modulation control by the second switching element; 14. The power supply device of claim 13, configured to control the second switching element to reduce a duty ratio in the pulse width modulation control when the at least one of the first supply voltage and the first supply current is in the abnormal state.

15. The power supply device of claim 13, wherein the control unit is configured to determine whether the at least one of the first supply voltage and the first supply current is in the abnormal state based on the at least one of the first supply voltage and the first supply current.

16. The power supply apparatus of claim 13 , wherein the abnormal condition includes a condition in which a voltage distortion of the first supply voltage occurs.

17. Further comprising a notification unit capable of notifying a user, 14. The power supply device of claim 13, wherein the control unit is configured to control the notification unit to notify the user that the at least one of the first supply voltage and the first supply current is in the abnormal state when the at least one of the first supply voltage and the first supply current is in the abnormal state.

18. A power supply device for supplying power to a powered unit, a rectification unit configured to convert a first supply power supplied from an AC power source from AC to DC; a power conversion unit configured to convert a second supply voltage of a second supply power provided by the rectification unit or to convert the second supply power from direct current to alternating current; A control unit configured to control the rectification unit and the power conversion unit, the rectification unit includes a first switching element, the control unit is configured to control the rectification unit to stop operation of the first switching element and to control the power conversion unit to reduce the first supply current when at least one of a first supply voltage of the first supply power and a first supply current of the first supply power is in an abnormal state.

19. 20. The power supply apparatus of claim 1, further comprising a detector configured to detect the at least one of the first supply current and the first supply voltage.

20. the power supply unit includes a power storage unit, The power supply device of claim 1 , 4 , or 18 , wherein the power conversion unit is configured to supply power to the power storage unit.

21. 20. The power supply device of claim 1, 4, or 18, wherein the power supply device is for a human-powered vehicle.

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