Auxiliary power supplies, power supplies, and medical systems

Abstract

To provide an auxiliary power supply device that can inhibit the whole system comprising both of an auxiliary power supply circuit unit and a sub power source circuit unit from being large-sized.SOLUTION: An auxiliary power supply device connected to a power source device comprises: an auxiliary power supply circuit unit that when power supply to the power source device is intercepted, supplies power to the power source device; and a sub power source circuit unit that has an input side connected to the power source device and an output side connected to a load and supplies output voltage to another circuit unit depending on power supplied from the power source device.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an auxiliary power supply, a power supply device, and a medical system. [Background technology]

[0002] 2. Description of the Related Art Research and development is being conducted on technology for protecting a load connected to a power supply device when the supply of power to the power supply device is cut off due to a power outage or the like.

[0003] In this regard, there is known a power supply device that has a smoothing circuit section between the output side of the rectifier circuit section and the input side of the switching power supply section, smoothing the output of the rectifier circuit section and supplying the smoothed output to the switching power supply section, and that can add a second capacitance to the first capacitance of the smoothing circuit section as an auxiliary power supply device, which extends the output holding time of the switching power supply section when the supply of AC power to the rectifier circuit section is cut off (see Patent Document 1). Note that the output holding time refers to the time during which the switching power supply section can hold its output when the supply of AC power to the rectifier circuit section is cut off. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-004674 Summary of the Invention [Problem to be solved by the invention]

[0005] Here, a secondary power supply unit is often added to the power supply unit in addition to the auxiliary power supply unit described in Patent Document 1. However, adding two units, the auxiliary power supply unit and the secondary power supply unit, to the power supply unit can lead to an increase in size of the power supply unit. An increase in size of the power supply unit can lead to a decrease in versatility, which is undesirable.

[0006] The present invention has been made in consideration of the above circumstances, and has an objective of providing an auxiliary power supply device, a power supply device, and a medical system that can prevent the overall system, which has both an auxiliary power supply circuit unit and a secondary power supply circuit unit, from becoming larger. [Means for solving the problem]

[0007] One aspect of the present invention is an auxiliary power supply device connected to a power supply device, the auxiliary power supply device including: an auxiliary power supply circuit section that supplies power to the power supply device when the supply of power to the power supply device is cut off; and a sub-power supply circuit section having an input side connected to the power supply device and an output side connected to a load, and supplying an output voltage to other circuit sections depending on the power supplied from the power supply device. Effect of the Invention

[0008] According to the present invention, it is possible to prevent an increase in the size of the entire system including both an auxiliary power supply circuit section and a secondary power supply circuit section. [Brief description of the drawings]

[0009] [Figure 1] 1 is a diagram showing an example of a configuration of a power supply system 1 according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing another example of the configuration of the power supply system 1. [Diagram 3] 1 is a diagram showing an example of the configuration of a power supply device PS to which an auxiliary power supply device 20 is connected. [Figure 4] FIG. 13 is a diagram showing another example of the configuration of a power supply device PS to which the auxiliary power supply device 20 is connected. [Diagram 5] 13 is a diagram showing yet another example of the configuration of a power supply device PS to which an auxiliary power supply device 20 is connected. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] <Embodiment> Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Here, in the embodiment, a conductor that transmits an electric signal corresponding to DC power or an electric signal corresponding to AC power will be referred to as a transmission line. The transmission line may be, for example, a conductor printed on a substrate, a conductor formed in a linear shape, or another conductor. In addition, in the embodiment, when it is referred to as a voltage, it means a potential difference from a predetermined reference potential, and illustration and description of the reference potential are omitted. Here, the reference potential may be any potential. In the embodiment, as an example, a case where the reference potential is the ground potential will be described. In addition, in the embodiment, for convenience of explanation, a state in which a certain phototransistor has a collector terminal and an emitter terminal conducting is referred to as an on state. In addition, in the embodiment, for convenience of explanation, a state in which a certain phototransistor has a collector terminal and an emitter terminal not conducting is referred to as an off state.

[0011] <Power supply system configuration> Hereinafter, the configuration of a power supply system 1 according to an embodiment will be described with reference to Fig. 1. Fig. 1 is a diagram showing an example of the configuration of a power supply system 1 according to an embodiment.

[0012] The power supply system 1 supplies a voltage of a predetermined magnitude to a load LD based on a voltage supplied from an external power supply P. Note that in Fig. 1, the power supply P is omitted for the sake of simplicity.

[0013] In the following, as an example, a case will be described in which the power source P is a commercial power source that supplies an AC voltage to the power source device 10. In addition, in the following, as an example, a case will be described in which the power supply system 1 supplies a DC voltage to the load LD. Note that the power source P may be another power source that supplies an AC voltage to the power source device 10, instead of the commercial power source. Also, the power source P may be another power source that supplies a DC voltage to the power source device 10, instead of a power source that supplies an AC voltage to the power source device 10. Also, the power supply system 1 may be configured to supply an AC voltage to the load LD, instead of a configuration that supplies a DC voltage to the load LD.

[0014] The load LD may be any device as long as it is a device to which DC power is supplied from the power supply system 1. For example, the load LD is a motor, a storage battery, or the like.

[0015] The power supply system 1 includes a power supply device 10, an auxiliary power supply device 20, a resistive element R1, a diode D1, and a diode D2. The power supply system 1 may include other circuit elements, other circuits, other devices, other members, and the like in addition to the above. The power supply system 1 may not include some or all of the resistive element R1, the diode D1, and the diode D2. In the example shown in FIG. 1, the power supply system 1 includes the power supply device 10, the auxiliary power supply device 20, the resistive element R1, the diode D1, and the diode D2 as separate components. However, in the power supply system 1, some or all of the power supply device 10, the auxiliary power supply device 20, the resistive element R1, the diode D1, and the diode D2 may be integrated. The power supply system 1 may include a load LD in addition to the power supply device 10, the auxiliary power supply device 20, the resistive element R1, the diode D1, and the diode D2. In this case, the load LD may be configured integrally with some or all of the power supply device 10, the auxiliary power supply device 20, the resistive element R1, the diode D1, and the diode D2.

[0016] First, an example of a connection mode of the power supply device 10, the auxiliary power supply device 20, the load LD, the resistive element R1, the diode D1, and the diode D2 in the power supply system 1 will be described.

[0017] The power supply device 10 has eight terminals: a power supply terminal 10I11, a power supply terminal 10I12, an input terminal 10I21, an input terminal 10I22, an output terminal 10O11, an output terminal 10O12, an output terminal 10O21, and an output terminal 10O22. The power supply device 10 may have other terminals in addition to the eight terminals.

[0018] The auxiliary power supply device 20 has six terminals: a power supply terminal 20I11, a power supply terminal 20I12, an input terminal 20I21, an input terminal 20I22, an output terminal 20O11, and an output terminal 20O12. The auxiliary power supply device 20 may have other terminals in addition to the six terminals.

[0019] The load LD has two terminals, a power supply terminal LDI1 and a power supply terminal LDI2. Note that the load LD may have another terminal in addition to the two terminals.

[0020] The power supply terminal 10I11 of the power supply device 10 is a terminal connected to one of two output terminals of the power supply P via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 10I11 and the power supply P as long as the functions of the power supply system 1 are not impaired.

[0021] The power supply terminal 10I12 of the power supply device 10 is a terminal connected via a transmission line to the other of the two output terminals of the power supply P. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 10I12 and the power supply P as long as the functions of the power supply system 1 are not impaired.

[0022] The output terminal 10O11 of the power supply device 10 is connected to the power supply terminal LDI1 of the load LD via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 10O11 and the power supply terminal LDI1 as long as the functions of the power supply system 1 are not impaired.

[0023] The transmission line connecting the output terminal 10O11 of the power supply device 10 and the power supply terminal LDI1 of the load LD is connected to the anode of the diode D1 via another transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the transmission line connecting the output terminal 10O11 and the power supply terminal LDI1 and the diode D1 as long as the function of the power supply system 1 is not impaired.

[0024] The cathode of the diode D1 is connected to the input terminal 10I21 of the power supply device 10 and the cathode of the diode D2 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the diode D1 and the input terminal 10I21 as long as the functions of the power supply system 1 are not impaired. Also, other circuit elements, other circuits, other devices, other members, etc. may be provided between the diode D1 and the diode D2 as long as the functions of the power supply system 1 are not impaired.

[0025] The anode of the diode D2 is connected to one of the two terminals of the resistor element R1 and to the output terminal 20O11 of the auxiliary power supply device 20 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the diode D2 and the resistor element R1 as long as the functions of the power supply system 1 are not impaired. Also, other circuit elements, other circuits, other devices, other members, etc. may be provided between the diode D2 and the output terminal 20O11 as long as the functions of the power supply system 1 are not impaired.

[0026] The other of the two terminals of the resistance element R1 is connected via a transmission line to an input terminal 20I21 of the auxiliary power supply device 20. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the resistance element R1 and the input terminal 20I21 as long as they do not impair the functions of the power supply system 1.

[0027] The output terminal 10O12 of the power supply device 10 is connected to a power supply terminal LDI2 of the load LD via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 10O12 and the power supply terminal LDI2 as long as the functions of the power supply system 1 are not impaired.

[0028] The transmission line connecting the output terminal 11O12 of the power supply device 10 and the power supply terminal LDI2 of the load LD is connected to the input terminal 10I22 of the power supply device 10, the input terminal 20I22 of the auxiliary power supply device 20, and the output terminal 20O12 of the auxiliary power supply device 20 via other transmission lines. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the transmission line connecting the output terminal 11O12 and the power supply terminal LDI2 and the input terminal 10I22, as long as the function of the power supply system 1 is not impaired. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the transmission line connecting the output terminal 11O12 and the power supply terminal LDI2 and the input terminal 20I22, as long as the function of the power supply system 1 is not impaired. In addition, other circuit elements, other circuits, other devices, other components, etc. may be provided between the transmission path connecting the output terminal 11O12 and the power supply terminal LDI2 and the output terminal 20O12, as long as the functionality of the power supply system 1 is not impaired.

[0029] The output terminal 10O21 of the power supply device 10 is connected to the power supply terminal 20I11 of the auxiliary power supply device 20 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 10O21 and the power supply terminal 20I11 as long as the functions of the power supply system 1 are not impaired.

[0030] The output terminal 10O22 of the power supply device 10 is connected to the power supply terminal 20I12 of the auxiliary power supply device 20 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 10O22 and the power supply terminal 20I12 as long as the functions of the power supply system 1 are not impaired.

[0031] Next, the configuration of the power supply device 10 will be described.

[0032] The power supply device 10 includes a power supply circuit section 11, a control circuit section 12, and a switching circuit section 13. Note that the power supply device 10 may include other circuit elements, other circuits, other devices, other members, etc. in addition to these three circuit sections.

[0033] The power supply circuit unit 11 has seven terminals: a power supply terminal 11I11, a power supply terminal 11I12, an input terminal 11I2, an output terminal 11O11, an output terminal 11O12, an output terminal 11O21, and an output terminal 11O22. Note that the power supply circuit unit 11 may have other terminals in addition to the seven terminals.

[0034] The control circuit section 12 has two terminals: an input terminal 12I and an output terminal 120. Note that the control circuit section 12 may have other terminals in addition to these two terminals.

[0035] The switching circuit unit 13 has three terminals: an input terminal 13I11, an input terminal 13I12, and an output terminal 130. Note that the switching circuit unit 13 may have other terminals in addition to the three terminals.

[0036] The power supply terminal 11I11 of the power supply circuit unit 11 is connected to the power supply terminal 10I11 of the power supply device 10 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 11I11 and the power supply terminal 10I11 as long as the function of the power supply system 1 is not impaired.

[0037] The power supply terminal 11I12 of the power supply circuit unit 11 is connected to the power supply terminal 10I12 of the power supply device 10 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 11I12 and the power supply terminal 10I12 as long as the functions of the power supply system 1 are not impaired.

[0038] The output terminal 11O11 of the power supply circuit unit 11 is connected to the output terminal 10O11 of the power supply device 10 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 11O11 and the output terminal 10O11 as long as the functions of the power supply system 1 are not impaired.

[0039] The output terminal 11O12 of the power supply circuit unit 11 is connected to the output terminal 10O12 of the power supply device 10 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 11O12 and the output terminal 10O12 as long as the functions of the power supply system 1 are not impaired.

[0040] The output terminal 11O21 of the power supply circuit unit 11 is connected to the output terminal 10O21 of the power supply device 10 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 11O21 and the output terminal 10O21 as long as the functions of the power supply system 1 are not impaired.

[0041] The output terminal 11O22 of the power supply circuit unit 11 is connected to the output terminal 10O22 of the power supply device 10 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 11O22 and the output terminal 10O22 as long as the functions of the power supply system 1 are not impaired.

[0042] The input terminal 11I2 of the power supply circuit unit 11 is connected to the output terminal 12O of the control circuit unit 12 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the input terminal 11I2 and the output terminal 12O as long as the functions of the power supply system 1 are not impaired.

[0043] The input terminal 12I of the control circuit unit 12 is connected to the output terminal 13O of the switching circuit unit 13 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the input terminal 12I and the output terminal 13O as long as the functions of the power supply system 1 are not impaired.

[0044] The input terminal 13I11 of the switching circuit unit 13 is connected to the input terminal 10I21 of the power supply device 10 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the input terminal 13I11 and the input terminal 10I21 as long as the functions of the power supply system 1 are not impaired.

[0045] The input terminal 13I12 of the switching circuit unit 13 is connected to the input terminal 10I22 of the power supply device 10 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the input terminal 13I12 and the input terminal 10I22 as long as the functions of the power supply system 1 are not impaired.

[0046] Next, the configuration of the power supply circuit unit 11 will be described.

[0047] The power supply circuit unit 11 may have any configuration as long as it is capable of converting an AC voltage supplied from a power supply P into a DC voltage and outputting the converted DC voltage. In the following, as an example, a case will be described in which the power supply circuit unit 11 includes an AC (Alternating Current) / DC (Direct Current) converter 111, a switching circuit unit 112, a transformer 113, and a rectifying and smoothing circuit unit 114 as shown in FIG. 1. When a DC voltage is supplied from the power supply P, the power supply circuit unit 11 includes a DC / DC converter instead of the AC / DC converter 111. That is, the power supply circuit unit 11 includes a converter that converts the voltage supplied from the power supply P into a DC voltage. An example of this converter is the AC / DC converter 111.

[0048] One of the two power supply terminals of the AC / DC converter 111 is connected via a transmission line to a power supply terminal 11I11 of the power supply circuit unit 11. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the AC / DC converter 111 and the power supply terminal 11I11 as long as the functions of the power supply system 1 are not impaired.

[0049] The other of the two power supply terminals of the AC / DC converter 111 is connected to a power supply terminal 11I12 of the power supply circuit unit 11 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the AC / DC converter 111 and the power supply terminal 11I12 as long as the functions of the power supply system 1 are not impaired.

[0050] Furthermore, the higher potential output terminal of the two output terminals of the AC / DC converter 111 is connected to the higher potential power supply terminal of the two power supply terminals of the switching circuit unit 112 and to the output terminal 11O21 of the power supply circuit unit 11 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal and the power supply terminal as long as the function of the power supply system 1 is not impaired. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the AC / DC converter 111 and the output terminal 11O21 as long as the function of the power supply system 1 is not impaired.

[0051] Furthermore, the low-potential output terminal of the two output terminals of the AC / DC converter 111 is connected to the low-potential power supply terminal of the two power supply terminals of the switching circuit unit 112 and the output terminal 11O22 of the power supply circuit unit 11 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal and the power supply terminal as long as the function of the power supply system 1 is not impaired. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the AC / DC converter 111 and the output terminal 11O22 as long as the function of the power supply system 1 is not impaired.

[0052] That is, the input side of AC / DC converter 111 is connected to power source P via these power source terminals. As a result, AC / DC converter 111 is supplied with an AC voltage from power source P. AC / DC converter 111 converts the AC voltage supplied from power source P into a DC voltage. AC / DC converter 111 supplies the converted DC voltage to switching circuit unit 112 and applies it between output terminal 10O21 and output terminal 10O22. In other words, AC / DC converter 111 supplies the converted DC voltage to both switching circuit unit 112 and auxiliary power supply device 20.

[0053] The AC / DC converter 111 may be configured, for example, by a combination of a PFC (Power Factor Correction) circuit (power factor correction circuit) and a DC / DC converter, or by a combination of a rectifier circuit and a DC / DC converter, or by other circuits. In the following, as an example, the AC / DC converter 111 is described as having a smoothing capacitor together with a rectifier circuit. In the following, for convenience of explanation, this smoothing capacitor is referred to as a first smoothing capacitor.

[0054] One of the two output terminals of the switching circuit unit 112 is connected to one of the two terminals of the primary winding of the transformer 113 via a transmission line. The other of the two output terminals of the switching circuit unit 112 is connected to the other of the two terminals of the primary winding of the transformer 113 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the switching circuit unit 112 and the primary winding of the transformer 113 as long as the function of the power supply system 1 is not impaired.

[0055] The switching circuit unit 112 converts the DC voltage generated by the AC / DC converter 111 into an AC voltage according to the control by the control circuit unit 12. The switching circuit unit 112 supplies the converted AC voltage to a primary winding of the transformer 113.

[0056] The switching circuit unit 112 is, for example, a switching circuit (for example, a full-bridge circuit, a half-bridge circuit, etc.) in which switching elements (for example, a field-effect transistor, a bipolar transistor, etc.) are bridge-connected.

[0057] One of the terminals of the secondary winding of the transformer 113 is connected via a transmission line to the higher potential power supply terminal of the two power supply terminals of the rectifying and smoothing circuit unit 114. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the secondary winding of the transformer 113 and the power supply terminal as long as the functions of the power supply system 1 are not impaired.

[0058] The other of the terminals of the secondary winding of the transformer 113 is connected via a transmission line to the lower potential power supply terminal of the two power supply terminals of the rectifying and smoothing circuit unit 114. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the secondary winding of the transformer 113 and the power supply terminal as long as the functions of the power supply system 1 are not impaired.

[0059] Based on the law of electromagnetic induction, transformer 113 transmits the AC voltage supplied from switching circuit unit 112 from a primary winding of transformer 113 to a secondary winding of transformer 113. The secondary winding of transformer 113 supplies the transmitted AC voltage to rectifying and smoothing circuit unit 114.

[0060] Of the two output terminals of the rectifying and smoothing circuit unit 114, the higher potential output terminal is connected via a transmission line to the output terminal 11O11 of the power supply circuit unit 11. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal and the output terminal 11O11 as long as they do not impair the functions of the power supply system 1.

[0061] Of the two output terminals of the rectifying and smoothing circuit unit 114, the output terminal on the lower potential side is connected via a transmission line to the output terminal 11O12 of the power supply circuit unit 11. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal and the output terminal 11O12 as long as the functions of the power supply system 1 are not impaired.

[0062] The rectifying and smoothing circuit unit 114 converts the AC voltage supplied from the secondary winding of the transformer 113 into a DC voltage. The rectifying and smoothing circuit unit 114 applies the converted DC voltage between the output terminal 10O11 and the output terminal 10O12 of the power supply device 10 via the output terminal 11O11 and the output terminal 11O12. In other words, the rectifying and smoothing circuit unit 114 supplies the converted DC voltage to the load LD and the switching circuit unit 13, respectively.

[0063] The rectifying and smoothing circuit section 114 is composed of, for example, a rectifying diode (not shown) and a smoothing capacitor (not shown).

[0064] Next, the configuration of the control circuit unit 12 will be described.

[0065] The control circuit section 12 controls the power supply circuit section 11. More specifically, the control circuit section 12 controls the switching circuit section 112 included in the power supply circuit section 11, and performs switching of each switching element included in the switching circuit section 112.

[0066] The control circuit unit 12 is enabled when an enable signal is output from the switching circuit unit 13. When the control circuit unit 12 is enabled, the control circuit unit 12 controls the power supply circuit unit 11. On the other hand, when an enable signal is not output from the switching circuit unit 13, the control circuit unit 12 is disabled. When the control circuit unit 12 is disabled, the control circuit unit 12 does not control the power supply circuit unit 11.

[0067] Next, the configuration of the switching circuit unit 13 will be described.

[0068] When a DC voltage equal to or greater than a predetermined magnitude is supplied from at least one of the power supply circuit unit 11 and the auxiliary power supply device 20 via the input terminals 13I11 and 13I12, the switching circuit unit 13 outputs an enable signal to the control circuit unit 12. That is, the switching circuit unit 13 causes the control circuit unit 12 to switch between enabled and disabled states depending on whether or not the switching circuit unit 13 outputs an enable signal. The switching circuit unit 13 may be referred to as a remote control unit. The predetermined magnitude is, for example, the magnitude of the voltage output from the auxiliary power supply device 20, but is not limited to this.

[0069] Next, the configuration of the auxiliary power supply device 20 will be described.

[0070] The auxiliary power supply device 20 includes an auxiliary power supply circuit section 21 and a secondary power supply circuit section 22. Note that the auxiliary power supply device 20 may include other circuit elements, other circuits, other devices, other members, etc. in addition to these two circuit sections.

[0071] The auxiliary power supply circuit 21 has four terminals: a power supply terminal 21I11, a power supply terminal 21I12, an input terminal 21I21, and an input terminal 21I22. The auxiliary power supply circuit 21 may have other terminals in addition to the four terminals.

[0072] The secondary power supply circuit unit 22 has four terminals: a power supply terminal 22I11, a power supply terminal 22I12, an output terminal 22O11, and an output terminal 22O12. The secondary power supply circuit unit 22 may have other terminals in addition to the four terminals.

[0073] The power supply terminal 21I11 of the auxiliary power supply circuit unit 21 is connected to the power supply terminal 20I11 of the auxiliary power supply device 20 and the power supply terminal 22I11 of the sub-power supply circuit unit 22 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 21I11 and the power supply terminal 20I11 as long as the functions of the power supply system 1 are not impaired. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 21I11 and the power supply terminal 22I11 as long as the functions of the power supply system 1 are not impaired.

[0074] The power supply terminal 21I12 of the auxiliary power supply circuit unit 21 is connected to the power supply terminal 20I12 of the auxiliary power supply device 20 and the power supply terminal 22I12 of the sub-power supply circuit unit 22 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 21I12 and the power supply terminal 20I12 as long as the functions of the power supply system 1 are not impaired. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 21I12 and the power supply terminal 22I12 as long as the functions of the power supply system 1 are not impaired.

[0075] An input terminal 21I21 of the auxiliary power supply circuit unit 21 is connected to an input terminal 20I21 of the auxiliary power supply device 20 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the input terminal 21I21 and the input terminal 20I21 as long as the functions of the power supply system 1 are not impaired.

[0076] The input terminal 21I22 of the auxiliary power supply circuit unit 21 is connected to the input terminal 20I22 of the auxiliary power supply device 20 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the input terminal 21I22 and the input terminal 20I22 as long as the functions of the power supply system 1 are not impaired.

[0077] The output terminal 22O11 of the auxiliary power supply circuit unit 22 is connected to the output terminal 20O11 of the auxiliary power supply device 20 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 22O11 and the output terminal 20O11 as long as the functions of the power supply system 1 are not impaired.

[0078] The output terminal 22O12 of the auxiliary power supply circuit unit 22 is connected to the output terminal 20O12 of the auxiliary power supply device 20 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal 22O12 and the output terminal 20O12 as long as the functions of the power supply system 1 are not impaired.

[0079] Next, the configuration of the auxiliary power supply circuit unit 21 will be described.

[0080] The auxiliary power supply circuit unit 21 supplies power to the power supply device 10 when the supply of power to the power supply device 10 is interrupted. The auxiliary power supply circuit unit 21 may have any configuration as long as it is capable of supplying power to the power supply device 10 when the supply of power to the power supply device 10 is interrupted. In the following, as an example, a case will be described in which the auxiliary power supply circuit unit 21 includes a fuse H, a resistive element R2, a diode D3, a charge / discharge circuit unit 211, a constant current circuit unit 212, a constant voltage circuit unit 213, a voltage determination circuit unit 214, and a notification circuit unit 215 as shown in FIG. 1.

[0081] One of the two terminals of the fuse H is connected via a transmission line to a power supply terminal 21I11 of the auxiliary power supply circuit unit 21. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the fuse H and the power supply terminal 21I11 as long as they do not impair the functions of the power supply system 1.

[0082] The other of the two terminals of the fuse H is connected to one of the two terminals of the resistor element R2 and the cathode of the diode D3 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the fuse H and the resistor element R2 as long as the function of the power supply system 1 is not impaired. Also, other circuit elements, other circuits, other devices, other members, etc. may be provided between the fuse H and the diode D3 as long as the function of the power supply system 1 is not impaired. Also, other circuit elements, other circuits, other devices, other members, etc. may be provided between the resistor element R2 and the cathode of the diode D3 as long as the function of the power supply system 1 is not impaired.

[0083] The other of the two terminals of the resistance element R2 is connected to the anode of the diode D3 and the higher potential power supply terminal of the two power supply terminals of the charge / discharge circuit unit 211 via a transmission line. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the resistance element R2 and the anode of the diode D3 as long as the function of the power supply system 1 is not impaired. Also, other circuit elements, other circuits, other devices, other members, etc. may be provided between the resistance element R2 and the charge / discharge circuit unit 211 as long as the function of the power supply system 1 is not impaired. Also, other circuit elements, other circuits, other devices, other members, etc. may be provided between the diode D3 and the charge / discharge circuit unit 211 as long as the function of the power supply system 1 is not impaired.

[0084] In this manner, the resistive element R2 is connected in parallel with the diode D3 between the power supply terminal 20I11 of the auxiliary power supply device 20 and the charge / discharge circuit unit 211. The direction in which the diode D3 passes a current is from the charge / discharge circuit unit 211 to the power supply terminal 20I11. The resistor element R2 may be connected in parallel with the diode D3 between the power supply terminal 20I12 of the auxiliary power supply device 20 and the charge / discharge circuit unit 211. In this case, one of the two terminals of the fuse H is connected to the power supply terminal 21I11 of the auxiliary power supply circuit unit 21 via a transmission line. The other of the two terminals of the fuse H is connected to the high-potential power supply terminal of the two power supply terminals of the charge / discharge circuit unit 211 via a transmission line. One of the two terminals of the resistor element R2 is connected to the power supply terminal 21I12 of the auxiliary power supply circuit unit 21 and the anode of the diode D3 via a transmission line. The other of the two terminals of the resistor element R2 is connected to the cathode of the diode D3 and the low-potential power supply terminal of the two power supply terminals of the charge / discharge circuit unit 211 via a transmission line. The direction in which the diode D3 passes the current is the direction from the charge / discharge circuit section 211 to the power supply terminal 20I11. Here, other circuit elements, other circuits, other devices, other members, etc. may be provided between the fuse H and the power supply terminal 21I11 as long as the function of the power supply system 1 is not impaired. In addition, other circuit elements, other circuits, other devices, other members, etc. may be provided between the fuse H and the higher-potential power supply terminal of the two power supply terminals of the charge / discharge circuit section 211 as long as the function of the power supply system 1 is not impaired. In addition, other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 21I12 and the resistance element R2 as long as the function of the power supply system 1 is not impaired. In addition, other circuit elements, other circuits, other devices, other members, etc. may be provided between the resistance element R2 and the cathode of the diode D3 as long as the function of the power supply system 1 is not impaired. In addition, other circuit elements, other circuits, other devices, other members, etc. may be provided between the power supply terminal 21I12 and the anode of the diode D3 as long as they do not impair the function of the power supply system 1. In addition, other circuit elements, other circuits, other devices, other members, etc. may be provided between the resistance element R2 and the cathode of the diode D3 as long as they do not impair the function of the power supply system 1.In addition, other circuit elements, other circuits, other devices, other members, etc. may be provided between the resistance element R2 and the lower potential power supply terminal of the two power supply terminals of the charging / discharging circuit unit 211, as long as the functions of the power supply system 1 are not impaired. Other circuit elements, other circuits, other devices, other members, etc. may be provided between the cathode of the diode D3 and the lower potential power supply terminal of the two power supply terminals of the charging / discharging circuit unit 211, as long as the functions of the power supply system 1 are not impaired.

[0085] Of the two power supply terminals of the charge / discharge circuit section 211, the power supply terminal on the lower potential side is connected via a transmission line to a power supply terminal 21I12 of the auxiliary power supply circuit section 21. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the charge / discharge circuit section 211 and the power supply terminal 21I12 as long as the functions of the power supply system 1 are not impaired.

[0086] The higher potential output terminal of the two output terminals of the charge / discharge circuit section 211 is connected via a transmission line to the higher potential power supply terminal of the two power supply terminals of the constant current circuit section 212. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal and the power supply terminal as long as they do not impair the functions of the power supply system 1.

[0087] Of the two output terminals of the charge / discharge circuit section 211, the output terminal on the lower potential side is connected via a transmission line to the power supply terminal of the two power supply terminals of the constant current circuit section 212 on the lower potential side. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between the output terminal and the power supply terminal as long as they do not impair the functions of the power supply system 1.

[0088] As shown in FIG. 1, the charge / discharge circuit unit 211 includes a capacitor that is charged by AC power being supplied from the power source P to the power supply device 10 and discharges a discharge current in response to the discharge of the first smoothing capacitor of the AC / DC converter 111. For convenience of explanation, the capacitor will be referred to as the first capacitor in the following description. One of the two terminals of the first capacitor is connected to the high-potential power source terminal of the two power source terminals of the charge / discharge circuit unit 211 and the high-potential output terminal of the two output terminals of the charge / discharge circuit unit 211 via a transmission line. The other of the two terminals of the first capacitor is connected to the low-potential power source terminal of the two power source terminals of the charge / discharge circuit unit 211 and the low-potential output terminal of the two output terminals of the charge / discharge circuit unit 211 via a transmission line. For this reason, it can be said that the direction in which the above-mentioned diode D3 passes a current is a direction from the high-potential side of the first capacitor toward the power source terminal 20I11. In addition, when the resistance element R2 and the diode D3 are connected in parallel between the power supply terminal 21I12 of the auxiliary power supply circuit unit 21 and the lower potential power supply terminal of the two power supply terminals of the charge / discharge circuit unit 211, the direction in which the current passes through the diode D3 can be said to be the direction from the high potential side of the first capacitor to the power supply terminal 20I11. Here, other circuit elements, other circuits, other devices, other members, etc. may be provided between the first capacitor and each of the four terminals of the charge / discharge circuit unit 211 as long as the function of the power supply system 1 is not impaired.

[0089] Here, when a power outage or the like occurs, the first smoothing capacitor starts discharging because the supply of power from the power source P to the power supply device 10 is interrupted. That is, the first capacitor of the charge / discharge circuit unit 211 discharges a discharge current in this case. In other words, as shown in FIG. 1, when one of the two terminals of the first smoothing capacitor is connected to the power source terminal 20I11 and the other of the two terminals of the first smoothing capacitor is connected to the power source terminal 20I12, the first capacitor discharges a discharge current in response to the discharge of the first smoothing capacitor. This discharge current flows to the power supply device 10 in which the power supply from the power source P is interrupted in this case and to the constant current circuit unit 212. As a result, the power supply device 10 in which the power supply from the power source P is interrupted in this case can continue to drive based on the discharge current discharged from the first capacitor and supply a DC voltage to the load LD until the charging voltage of the first capacitor becomes lower than a predetermined voltage. In other words, when the supply of power from the power source P to the power supply device 10 is interrupted, the auxiliary power supply circuit 21 can continue the supply of DC voltage from the power supply device 10 to the load LD by discharging the discharge current from the first capacitor until the charging voltage of the first capacitor becomes lower than a predetermined voltage. In this case, the charging voltage of the first capacitor is supplied to the constant current circuit 212.

[0090] On the other hand, when power is being supplied from the power source P to the power supply device 10, the first capacitor of the charge / discharge circuit unit 211 is charged. In other words, when the supply of power from the power source P to the power supply device 10 is not interrupted, the first capacitor is charged by the DC voltage supplied from the AC / DC converter 111. In this case, the DC voltage supplied from the AC / DC converter 111 is also supplied to the constant current circuit unit 212.

[0091] The constant current circuit section 212 outputs a current of a predetermined magnitude to the constant voltage circuit section 213 based on a DC voltage supplied from the first smoothing capacitor or the first capacitor of the charge / discharge circuit section 211. The constant current circuit section 212 may have any configuration as long as it is capable of outputting a current of a predetermined magnitude to the constant voltage circuit section 213 based on the DC voltage. The constant current circuit section 212 and the constant voltage circuit section 213 may be connected in any manner. In addition, other circuit elements, other circuits, other devices, other members, etc. may be provided between the constant current circuit section 212 and the constant voltage circuit section 213 as long as the function of the power supply system 1 is not impaired.

[0092] The constant voltage circuit section 213 outputs a voltage of a predetermined magnitude to the voltage evaluation circuit section 214 based on the current output from the constant current circuit section 212. The constant voltage circuit section 213 may have any configuration as long as it is capable of outputting the voltage to the voltage evaluation circuit section 214 as a reference voltage based on the current. Note that the connection between the constant voltage circuit section 213 and the voltage evaluation circuit section 214 may be any connection. In addition, other circuit elements, other circuits, other devices, other members, etc. may be provided between the constant voltage circuit section 213 and the voltage evaluation circuit section 214 as long as the function of the power supply system 1 is not impaired.

[0093] The voltage evaluation circuit unit 214 compares a reference voltage generated based on the voltage output from the constant voltage circuit unit 213 with a detection voltage generated based on the charging voltage of the first capacitor of the charging / discharging circuit unit 211. More specifically, the voltage evaluation circuit unit 214 determines whether the detection voltage is lower than the reference voltage. For this reason, the voltage evaluation circuit unit 214 is connected to the high-potential output terminal of the charging / discharging circuit unit 211 via a transmission line. This allows the voltage evaluation circuit unit 214 to detect the detection voltage generated based on the charging voltage of the first capacitor. Note that any method may be used to generate this detection voltage based on the charging voltage of the first capacitor. For example, the charging voltage of the first capacitor is converted into a detection voltage by being divided by a resistive element connected on a transmission line connecting between the high-potential output terminal of the charging / discharging circuit unit 211 and the voltage evaluation circuit unit 214. Also, any method may be used to generate the reference voltage based on the voltage output from the constant voltage circuit unit 213. For example, the voltage output from the constant voltage circuit unit 213 is divided by a resistive element connected on a transmission line connecting the constant voltage circuit unit 213 and the voltage evaluation circuit unit 214, and converted into a reference voltage. Here, the reference voltage is, for example, the lowest voltage among the voltages that can drive the power supply device 10 when the supply of power from the power source P is cut off. Note that the reference voltage may be a voltage higher than the lowest voltage among the voltages that can drive the power supply device 10 when the supply of power from the power source P is cut off. The voltage evaluation circuit unit 214 may be configured to compare a reference voltage generated based on the voltage output from the constant voltage circuit unit 213 with a detection voltage generated based on the charging voltage of the first smoothing capacitor of the power supply circuit unit 11. More specifically, the voltage evaluation circuit unit 214 may be configured to determine whether or not the detection voltage is lower than the reference voltage. In this case, the voltage evaluation circuit unit 214 is connected to a transmission line that electrically connects between the cathode of a diode whose anode is connected to the power supply terminal on the high potential side of the charging / discharging circuit unit 211 and the power supply terminal 21I11 via a transmission line. This allows the voltage evaluation circuit unit 214 to detect the detection voltage generated based on the charging voltage of the first smoothing capacitor. The method of generating this detection voltage based on the charging voltage of the first smoothing capacitor may be any method. For example, the charging voltage of the first smoothing capacitor is converted into the detection voltage by being divided by a resistance element connected on the transmission line that connects between the transmission line and the voltage evaluation circuit unit 214.

[0094] When the voltage evaluation circuit unit 214 determines that the charging voltage of the first capacitor of the charging / discharging circuit unit 211 is equal to or higher than the reference voltage output from the constant voltage circuit unit 213, the voltage evaluation circuit unit 214 outputs a signal having an L level to the notification circuit unit 215. On the other hand, when the voltage evaluation circuit unit 214 determines that the charging voltage of the first capacitor is lower than the reference voltage output from the constant voltage circuit unit 213, the voltage evaluation circuit unit 214 outputs a signal having an H level to the notification circuit unit 215. That is, when the voltage evaluation circuit unit 214 outputs a signal having an L level, it indicates that the output of the DC voltage from the power supply device 10 has stopped. Also, when the voltage evaluation circuit unit 214 outputs a signal having an H level, it indicates that the output of the DC voltage from the power supply device 10 has not stopped. Note that the connection between the voltage evaluation circuit unit 214 and the notification circuit unit 215 may be any connection. In addition, other circuit elements, other circuits, other devices, other components, etc. may be provided between the voltage judgment circuit unit 214 and the notification circuit unit 215 as long as the functionality of the power supply system 1 is not impaired.

[0095] The notification circuit unit 215 notifies information indicating the judgment result of the voltage judgment circuit unit 214. In the following, as an example, a case will be described in which the notification circuit unit 215 includes a light-emitting diode and a phototransistor that switches between an on state and an off state according to the light emission of the light-emitting diode. In this case, the light-emitting diode emits light when an L level signal is output from the voltage judgment circuit unit 214, and turns off when an H level signal is output from the voltage judgment circuit unit 214. That is, the light emission of the light-emitting diode indicates that the supply of power from the power source P to the power supply device 10 has not stopped. On the other hand, the turning off of the light-emitting diode indicates that the supply of power from the power source P to the power supply device 10 has stopped. Here, the base terminal of the phototransistor receives the light emitted from the light-emitting diode. The collector terminal of the phototransistor is connected to the input terminal 21I21 of the auxiliary power supply device 20 via a transmission line. The emitter terminal of the phototransistor is connected to the input terminal 21I22 of the auxiliary power supply device 20 via a transmission line. That is, this phototransistor is supplied with a DC voltage from the power supply device 10 or the auxiliary power supply circuit section 22, and outputs a signal by an open collector system depending on whether the light emitting diode emits light or not. For this reason, the resistive element R1 provided in the power supply system 1 is a resistive element for limiting excessive power supply to the phototransistor. Note that the output destination of this signal may be another circuit provided in the auxiliary power supply device 20, or may be an external circuit, an external device, etc. The output destination of this signal is omitted in FIG. 1.

[0096] Next, the configuration of the secondary power supply circuit unit 22 will be described.

[0097] The secondary power supply circuit unit 22 may have any configuration as long as the input side is connected to the power supply device 10, the output side is connected to the load LD, and the output voltage can be supplied to other circuit units in accordance with the power supplied from the power supply device 10. In the following, as an example, a case will be described in which the secondary power supply circuit unit 22 includes an insulated DC / DC converter 221 having a transformer. Note that the secondary power supply circuit unit 22 may be configured to include, in addition to the DC / DC converter 221, other circuit elements, other circuits, other devices, other members, etc.

[0098] Of the two power supply terminals of the DC / DC converter 221, the power supply terminal on the higher potential side is connected via a transmission line to the power supply terminal 22I11 of the secondary power supply circuit unit 22. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between these two power supply terminals as long as they do not impair the functions of the power supply system 1.

[0099] Of the two power supply terminals of the DC / DC converter 221, the power supply terminal on the lower potential side is connected via a transmission line to the power supply terminal 22I12 of the secondary power supply circuit unit 22. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between these two power supply terminals as long as they do not impair the functions of the power supply system 1.

[0100] Of the two output terminals of the DC / DC converter 221, the higher potential output terminal is connected via a transmission line to the output terminal 22O11 of the secondary power supply circuit unit 22. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between these two output terminals as long as they do not impair the functions of the power supply system 1.

[0101] Of the two output terminals of the DC / DC converter 221, the output terminal on the lower potential side is connected via a transmission line to the output terminal 22O12 of the secondary power supply circuit unit 22. Note that other circuit elements, other circuits, other devices, other members, etc. may be provided between these two output terminals as long as they do not impair the functions of the power supply system 1.

[0102] That is, the DC / DC converter 221 is supplied with a DC voltage converted by the AC / DC converter 111 of the power supply device 10 from the power supply device 10. The DC / DC converter 221 then converts the supplied DC voltage into a DC voltage of a predetermined magnitude, and outputs the converted DC voltage as an output voltage to another circuit section. In the example shown in FIG. 1, the DC / DC converter 221 outputs the output voltage to each of the notification circuit section 215 of the auxiliary power supply circuit section 21 and the switching circuit section 13 of the power supply device 10. That is, each of the notification circuit section 215 and the switching circuit section 13 is an example of the other circuit section.

[0103] A switch element may be connected between the switching circuit unit 13 and the DC / DC converter 221. In this case, the user of the power supply system 1 can operate whether or not to enable the control circuit unit 12 of the power supply device 10 via the switch element. This allows the power supply system 1 to improve the convenience for the user.

[0104] With the above-described configuration, in the power supply system 1, the auxiliary power supply circuit section 21 and the secondary power supply circuit section 22 are integrally configured. Therefore, in the power supply system 1, the installation area can be made smaller than when the auxiliary power supply circuit section 21 and the secondary power supply circuit section 22 are connected to the power supply device 10 as separate devices. In other words, the power supply system 1 can suppress the increase in size of the entire power supply system 1. This means that the auxiliary power supply device 20 can suppress the increase in size of the entire power supply system 1 including both the auxiliary power supply circuit section 21 and the secondary power supply circuit section 22, compared to when the auxiliary power supply circuit section 21 and the secondary power supply circuit section 22 are separate. This also means that when the auxiliary power supply device 20 is integrally configured with the power supply device 10, the increase in size of the power supply device 10 can be suppressed. The suppression of the increase in size of the power supply device 10 and the power supply system 1 also leads to an improvement in the versatility of the auxiliary power supply device 20, the power supply device 10, and the power supply system 1.

[0105] Furthermore, when the auxiliary power supply circuit section 21 and the secondary power supply circuit section 22 are integrally configured as in this embodiment, it is possible to standardize the components around the power supply terminals of the auxiliary power supply circuit section 21 and the secondary power supply circuit section 22. In particular, when the auxiliary power supply circuit section 21 and the secondary power supply circuit section 22 are connected in parallel to the power supply device 10 as shown in Fig. 1, it is possible to reduce the number of parts by standardizing the components around the power supply terminals. This is desirable because it also leads to suppressing increases in manufacturing costs.

[0106] Furthermore, when the auxiliary power supply circuit section 21 and the auxiliary power supply circuit section 22 are integrally configured as in this embodiment, even if the supply of power to the power supply device 10 is interrupted, the auxiliary power supply circuit section 22 can be driven by the DC voltage supplied from the charge / discharge circuit section 211 of the auxiliary power supply circuit section 21 until the charging voltage of the first capacitor of the charge / discharge circuit section 211 becomes lower than a predetermined voltage. When the auxiliary power supply circuit section 21 and the auxiliary power supply circuit section 22 are connected to the power supply device 10 as different devices as in the conventional case, the auxiliary power supply circuit section 22 cannot be driven in response to the interruption of the supply of power to the power supply device 10. This is not desirable for protecting other circuits and other devices that are driven by the supply of power from the auxiliary power supply circuit section 22. In other words, it can be said that the integral configuration of the auxiliary power supply circuit section 21 and the auxiliary power supply circuit section 22 as in this embodiment is desirable for protecting other circuits and other devices that are driven by the supply of power from the auxiliary power supply circuit section 22.

[0107] The connection mode of the power supply system 1 shown in Fig. 1 may be the connection mode shown in Fig. 2. Fig. 2 is a diagram showing another example of the configuration of the power supply system 1.

[0108] In the example shown in FIG. 2, the switching circuit unit 13 is not supplied with a DC voltage from the power supply circuit unit 11, and the notification circuit unit 215 and the switching circuit unit 13 are each supplied with a DC voltage from the secondary power supply circuit unit 22. That is, in this example, the output terminal 10O11 of the power supply device 10 is connected to the power supply terminal LDI1 of the load LD by a transmission line. In this example, the output terminal 10O11 is not connected to the input terminal 10I21 of the power supply device 10, the resistive element R1, and the output terminal 20O11 of the auxiliary power supply device 20. In this example, the output terminal 10O12 of the power supply device 10 is connected to the power supply terminal LDI2 of the load LD by a transmission line. In this example, the output terminal 10O12 is not connected to the input terminal 10I22 of the power supply device 10, the input terminal 20I22 of the auxiliary power supply device 20, and the output terminal 20O12. For these reasons, in this example, the power supply system 1 does not include the diode D1 and the diode D2.

[0109] 1 and 2, when the power supply circuit section 11 of the power supply device 10 is of an isolated type (i.e., when the power supply device 10 has a transformer), power is supplied to the secondary power supply circuit section 22 from the primary side of the power supply circuit section 11. For this reason, in this case, the secondary power supply circuit section 22 is connected to both the primary side and the secondary side of the power supply circuit section 11, and therefore it is desirable that the secondary power supply circuit section 22 be of an isolated type (i.e., have a transformer) as in this example. Note that, when the power supply circuit section 11 is of a non-isolated type, the secondary power supply circuit section 22 may be of a non-isolated type or of an isolated type.

[0110] <Other examples of power supply devices to which the auxiliary power supply device can be connected> Hereinafter, another example of a power supply device to which the above-mentioned auxiliary power supply device 20 is connected will be described.

[0111] FIG. 3 is a diagram showing an example of the configuration of a power supply device PS to which the auxiliary power supply device 20 is connected. The power supply device PS shown in FIG. 3 is a power supply device to which a medical device MD is connected as a load. The medical device MD is a medical device that operates based on a DC voltage Vo output by the power supply device PS, and is, for example, a treatment device, a diagnostic device, an analytical device, etc., but is not limited to these. The treatment device is, for example, a low-frequency treatment device, an electric treatment device, etc. Furthermore, the diagnostic device is, for example, a CT (Computed Tomography), an MRI (Magnetic Resonance Imaging), etc. The analytical device is, for example, an electric titration device, an X-ray diffraction device, etc.

[0112] The power supply device PS has seven terminals, namely, a power supply terminal PS1, a power supply terminal PS2, a frame ground terminal PS3, an output terminal PS4, an output terminal PS5, a connection terminal PS6, and a connection terminal PS7. For example, a commercial power supply (for example, the above-mentioned power supply P) is connected to the power supply terminal PS1 and the power supply terminal PS2, and an AC voltage Vx is supplied from the commercial power supply. For example, the frame ground terminal PS3 is grounded to the ground. For example, the power supply terminal of the above-mentioned medical device MD is connected to the output terminal PS4 and the output terminal PS5. That is, the power supply device PS supplies a DC voltage Vo to the power supply terminal of the medical device MD from the output terminal PS4 and the output terminal PS5. For example, the auxiliary power supply device 20 is connected to the connection terminal PS6 and the connection terminal PS7. More specifically, a power supply terminal 20I11 of the auxiliary power supply device 20 is connected to the connection terminal PS6. On the other hand, a power supply terminal 20I12 of the auxiliary power supply device 20 is connected to the connection terminal PS7.

[0113] 3 includes, for example, a fuse section HS, a rectifier / smoothing circuit section RS, a switching circuit section SW, a transformer TR, a rectifier circuit section RF, and a smoothing circuit section SM. The power supply PS also includes an input transmission line L connected to a power supply terminal PS1, and an input transmission line N connected to a power supply terminal PS2.

[0114] The fuse section HS is provided in the power supply device PS so that the power supply device PS meets the medical standards that the power supply device PS must meet as a power supply device connected to medical equipment MD. The fuse section HS has a fuse provided on the input transmission line L that connects between the power supply terminal PS1 and the rectifying and smoothing circuit section RS, and a fuse provided on the input transmission line N that connects between the power supply terminal PS2 and the rectifying and smoothing circuit section RS. The power supply device PS may be configured to include a breaker instead of either or both of these two fuses.

[0115] The rectifying and smoothing circuit unit RS generates a pulsating voltage by rectifying the AC voltage Vx supplied from two transmission paths, an input transmission path L connected to the power supply terminal PS1 via the fuse section HS and an input transmission path N connected to the power supply terminal PS2 via the fuse section HS, and smoothes the generated pulsating voltage to output a DC voltage Vin. For this reason, the rectifying and smoothing circuit unit RS includes a smoothing capacitor SC that supplies a voltage for smoothing the rectified pulsating voltage. Here, one of the two terminals of the smoothing capacitor SC is connected to the input transmission path L. The other of the two terminals of the smoothing capacitor SC is connected to the input transmission path N. However, in FIG. 3, in order to prevent the diagram from becoming complicated, the transmission paths connecting the smoothing capacitor SC to each of the input transmission path L and the input transmission path N are omitted. In this way, the rectifying and smoothing circuit unit RS is connected to the fuse section HS provided in the previous stage of the rectifying and smoothing circuit unit RS via the input transmission path L and the input transmission path N. The rectifier smoothing circuit unit RS is connected to a connection terminal PS6 provided in the subsequent stage of the rectifier smoothing circuit unit RS via an input transmission path L. The rectifier smoothing circuit unit RS is connected to a connection terminal PS7 provided in the subsequent stage of the rectifier smoothing circuit unit RS via an input transmission path N. Therefore, the rectifier smoothing circuit unit RS applies the smoothed DC voltage Vin between the connection terminals PS6 and PS7. The rectifier smoothing circuit unit RS may be configured to further include a power factor correction circuit (PFC (Power Factor Correction) circuit).

[0116] The connection terminal PS6 is connected to one of the two input terminals of the switching circuit unit SW via the input transmission path L. The connection terminal PS7 is connected to the other of the two input terminals of the switching circuit unit SW via the input transmission path L. Therefore, the DC voltage Vin output from the rectifying and smoothing circuit unit RS is supplied to the switching circuit unit SW. The switching circuit unit SW includes, for example, a plurality of switch elements connected in a bridge configuration, and outputs an AC voltage generated by the operation of the plurality of switch elements controlled by the control unit CTR based on the DC voltage supplied from the rectifying and smoothing circuit unit RS to a primary winding of the transformer TR. Therefore, the switching circuit unit SW is connected to one of the two terminals of the winding via the input transmission path L, and is connected to the other of the two terminals of the winding via the input transmission path N.

[0117] The transformer TR is a transformer with reinforced insulation. The reason why the transformer TR has reinforced insulation is so that the power supply PS meets the medical standards mentioned above. The secondary winding of the transformer TR is connected to the rectifier circuit section RF via a transmission line and supplies AC voltage to the rectifier circuit section RF.

[0118] The rectifier circuit section RF rectifies the AC voltage supplied from the transformer TR to generate a pulsating voltage, and supplies the generated pulsating voltage to the smoothing circuit section SM via a transmission line.

[0119] The smoothing circuit section SM smoothes the pulsating voltage supplied from the rectifier circuit section RF to generate a DC voltage, and applies the generated DC voltage Vo between the output terminals PS4 and PS5.

[0120] The current detection circuit unit DC detects a current flowing through the input transmission line N that connects the connection terminal PS7 and the switching circuit unit SW. Then, the current detection circuit unit DC outputs a signal according to the magnitude of the detected current to the control unit CTR.

[0121] The control unit CTR is, for example, a microcomputer. The control unit CTR controls the duty of the driving frequency of the switching circuit unit SW in response to a signal acquired from the current detection circuit unit DC (for example, PWM control: Pulse Width Modulation Control) and switches the switch element. In addition, in FIG. 3, in order to prevent the diagram from becoming complicated, the transmission line connecting the control unit CTR and the switching circuit unit SW is omitted.

[0122] In this way, the power supply device PS to which the medical device MD is connected as a load is provided with a fuse (or breaker) in the fuse section HS in each of the input transmission line L and the input transmission line N. The auxiliary power supply device 20 according to the embodiment is connected to such a power supply device PS, for example. In this case, the auxiliary power supply device 20, the power supply device PS, and the medical device MD each constitute one medical system. This medical system can realize a configuration that can obtain medical standards because the power supply device PS has the fuse section HS and the transformer TR has reinforced insulation. Since this medical system includes the auxiliary power supply device 20, when the supply of power to the power supply device PS is cut off, the output from the power supply device PS can be maintained for a predetermined time. Furthermore, by suppressing the increase in size of the auxiliary power supply device 20, the medical system can also be suppressed from increasing in size as a whole.

[0123] In addition, many medical devices MD have a function of charging the DC voltage Vo to a secondary battery for backup. Therefore, the power supply device PS may be configured to be able to detect the occurrence of a reverse current from the medical device MD and to stop operation when the occurrence of a reverse current from the medical device MD is detected.

[0124] Here, the power supply device PS shown in Fig. 3 has an internal fuse section HS. However, the power supply device PS may have an external fuse section HS as shown in Fig. 4. That is, the fuse section HS may be separate from the power supply device PS and connected between the power supply device PS and a commercial power source (not shown). In this case, the medical system includes an auxiliary power supply device 20, a power supply device PS, medical equipment MD, and a fuse section HS. Fig. 4 is a diagram showing another example of the configuration of the power supply device PS to which the auxiliary power supply device 20 is connected.

[0125] 4, when the fuse section HS is provided outside the power supply PS, one of the two fuses in the fuse section HS is provided on the transmission path connecting a commercial power source (not shown) and a power supply terminal PS1. When the fuse section HS is provided outside the power supply PS, the other of the two fuses in the fuse section HS is provided on the transmission path connecting a commercial power source (not shown) and a power supply terminal PS2.

[0126] Furthermore, the power supply device PS may be configured so that one of the two fuses in the fuse section HS is provided internally and the other of the two fuses in the fuse section HS is provided externally, as shown in Fig. 6. Fig. 5 is a diagram showing yet another example of the configuration of the power supply device PS to which the auxiliary power supply device 20 is connected.

[0127] As shown in FIG. 5, the power supply device PS may be configured such that a first fuse section HS1 is provided on a transmission path connecting a commercial power source (not shown) and a power supply terminal PS1, and a second fuse section HS2 is provided on an input transmission path N connecting between the power supply terminal PS2 and the rectifying smoothing circuit section RS.

[0128] Here, the first fuse section HS1 includes a fuse provided on a transmission line connecting a commercial power source (not shown) and the power supply terminal PS1, and the second fuse section HS2 includes a fuse provided on an input transmission line N connecting the power supply terminal PS2 and the rectifying and smoothing circuit section RS.

[0129] As described above, the auxiliary power supply device according to the embodiment (auxiliary power supply device 20 in the example described above) is an auxiliary power supply device connected to a power supply device (power supply device 10 in the example described above), and includes an auxiliary power supply circuit section (auxiliary power supply circuit section 21 in the example described above) that supplies power to the power supply device when the power supply to the power supply device is interrupted, and a secondary power supply circuit section (secondary power supply circuit section 22 in the example described above) whose input side is connected to the power supply device and whose output side is connected to a load (load LD in the example described above) and which supplies an output voltage to other circuit sections (notification circuit section 215 and switching circuit section 13 in the example described above) depending on the power supplied from the power supply device. This makes it possible for the auxiliary power supply device to suppress an increase in the size of the entire system that includes both the auxiliary power supply circuit section and the secondary power supply circuit section.

[0130] Furthermore, in the auxiliary power supply device, a configuration may be used in which the power supply device is supplied with an AC voltage from an external power supply (power supply P in the example described above), the power supply device includes a converter (AC / DC converter 111 in the example described above) that converts the voltage supplied from the power supply into a DC voltage, the secondary power supply circuit unit includes an isolated DC / DC converter having a transformer (DC / DC converter 221 in the example described above), the DC / DC converter is supplied with the DC voltage after conversion by the converter from the power supply device, and the DC / DC converter converts the supplied DC voltage into a DC voltage of a predetermined magnitude and outputs the converted DC voltage to another circuit unit as an output voltage.

[0131] Moreover, in the auxiliary power supply device, the power supply device further includes a switching circuit unit (switching circuit unit 112 in the example described above) that converts the DC voltage converted by the converter into an AC voltage, a first transformer (transformer 113 in the example described above) that transmits the AC voltage converted by the switching circuit unit from the primary winding to the secondary winding, a rectifying and smoothing circuit unit (rectifying and smoothing circuit unit 114 in the example described above) that converts the AC voltage supplied from the secondary winding of the first transformer into a DC voltage and outputs the converted DC voltage, a control circuit unit (control circuit unit 12 in the example described above) that controls the switching circuit unit, and a switching circuit unit (switching circuit unit 13 in the example described above) that causes the control circuit unit to switch between enable and disable the switching circuit unit depending on the supplied voltage, and a configuration may be used in which the output side of the auxiliary power supply circuit unit is connected to the switching circuit unit and the switching circuit unit is one of the other circuit units to supply an output voltage to the switching circuit unit.

[0132] In addition, the auxiliary power supply device may be configured such that the sub-power supply circuit is connected in parallel to the auxiliary power supply circuit with respect to the power supply device.

[0133] Also, in the auxiliary power supply device, a configuration may be used in which the power supply device includes a primary-side smoothing capacitor (in the example described above, the first smoothing capacitor of AC / DC converter 111), the auxiliary power supply device includes a first power supply terminal (in the example described above, power supply terminal 20I11) connected to a first smoothing capacitor terminal of the smoothing capacitor, and a second power supply terminal (in the example described above, power supply terminal 20I12) connected to a second smoothing capacitor terminal of the smoothing capacitor, the auxiliary power supply circuit unit and the sub-power supply circuit unit are connected in parallel between the first power supply terminal and the second power supply terminal, and the auxiliary power supply circuit unit includes a first capacitor (in the example described above, the first capacitor of charge / discharge circuit unit 211) that is charged when power is supplied to the power supply device and discharges a discharge current in response to the discharge of the smoothing capacitor.

[0134] In addition, in the auxiliary power supply device, the auxiliary power supply circuit unit may further include a resistive element (resistive element R2 in the example described above) connected between the first capacitor and either the first or second power supply terminal, and a diode (diode D3 in the example described above) connected in parallel with the resistive element between the power supply terminal and the first capacitor, and the direction in which the diode passes current may be from the high potential side of the first capacitor toward the power supply terminal.

[0135] In addition, in the auxiliary power supply device, a configuration may be used in which, when the first smoothing capacitor terminal is connected to the first power supply terminal and the second smoothing capacitor terminal is connected to the second power supply terminal, the first capacitor discharges a discharge current in response to discharging of the smoothing capacitor.

[0136] Furthermore, in the auxiliary power supply device, the auxiliary power supply circuit section may include a charge / discharge circuit section (charge / discharge circuit section 211 in the example described above) having a first capacitor, a constant current circuit section (constant current circuit section 212 in the example described above) that outputs a current of a predetermined magnitude based on the voltage applied from the smoothing capacitor or the first capacitor, a constant voltage circuit section (constant voltage circuit section 213 in the example described above) that outputs a voltage of a predetermined magnitude based on the current output from the constant current circuit section, a voltage judgment circuit section (voltage judgment circuit section 214 in the example described above) that judges whether the detected voltage of the first capacitor or the detected voltage of the smoothing capacitor is lower than a reference voltage generated based on the voltage output from the constant voltage circuit section, and an alarm circuit section (announcement circuit section 215 in the example described above) that issues information indicative of the judgment result of the voltage judgment circuit section, and the other circuit sections may include the alarm circuit section.

[0137] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and may be changed, replaced, deleted, etc. without departing from the gist of the present invention. [Explanation of symbols]

[0138] 1...power supply system, 10...power supply device, 11...power supply circuit section, 12...control circuit section, 13...switching circuit section, 20...auxiliary power supply device, 21...auxiliary power supply circuit section, 22...subsidiary power supply circuit section, 111...AC / DC converter, 112...switching circuit section, 113...transformer, 114...rectification smoothing circuit section, 211...charging / discharging circuit section, 212...constant current circuit section, 213...constant voltage circuit section, 214...voltage judgment circuit section, 215...alarm circuit section, 221...DC / DC converter, CTR...control section, D1, D2, D3...diode, DC...current detection circuit section, H...fuse, HS...fuse section, HS1...first fuse section, HS2...second fuse section, LD...load, MD...medical device, P...power supply, PS...power supply device, R1, R2...resistance element, RF...rectifier circuit section, RS...rectifier smoothing circuit section, SC...smoothing capacitor, SM...smoothing circuit section, SW...switching circuit section, TR...transformer

Claims

1. 1. An auxiliary power supply connected to a power supply, comprising: an auxiliary power supply circuit unit that supplies power to the power supply device when the power supply to the power supply device is interrupted; a secondary power supply circuit section having an input side connected to the power supply device and an output side connected to a load, the secondary power supply circuit section supplying an output voltage to another circuit section in response to power supplied from the power supply device; Equipped with The power supply device includes a primary-side smoothing capacitor, the auxiliary power supply circuit unit includes a first capacitor that is charged when power is supplied to the power supply device and that discharges a discharge current in response to the discharge of the smoothing capacitor. Auxiliary power supply.

2. The power supply device is supplied with an AC voltage from an external power supply, the power supply device includes a converter that converts a voltage supplied from the power supply into a DC voltage; the secondary power supply circuit unit includes an isolated DC / DC converter having a transformer, The DC / DC converter is supplied with a DC voltage converted by the converter from the power supply device, The DC / DC converter converts the supplied DC voltage into a DC voltage of a predetermined magnitude, and outputs the converted DC voltage to the other circuit unit as the output voltage.

2. The auxiliary power supply of claim 1.

3. The power supply device is a switching circuit unit that converts the DC voltage converted by the converter into an AC voltage; a first transformer that transmits the AC voltage converted by the switching circuit from a primary winding to a secondary winding; a rectifying and smoothing circuit unit that converts an AC voltage supplied from a secondary winding of the first transformer into a DC voltage and outputs the converted DC voltage; A control circuit unit that controls the switching circuit unit; a switching circuit section that switches between enable and disable of the switching circuit section in response to a supplied voltage; Further comprising: an output side of the secondary power supply circuit unit is connected to the switching circuit unit, and the switching circuit unit is one of the other circuit units, and the output voltage is supplied to the switching circuit unit; 3. An auxiliary power supply as claimed in claim 2.

4. the secondary power supply circuit is connected in parallel to the auxiliary power supply circuit with respect to the power supply device; An auxiliary power supply device according to any one of claims 1 to 3.

5. The auxiliary power supply device comprises: a first power supply terminal connected to a first smoothing capacitor terminal of the smoothing capacitor; a second power supply terminal connected to a second smoothing capacitor terminal of the smoothing capacitor; Equipped with the auxiliary power supply circuit unit and the secondary power supply circuit unit are connected in parallel between the first power supply terminal and the second power supply terminal; 5. An auxiliary power supply as claimed in claim 4.

6. The auxiliary power supply circuit unit includes: a resistive element connected between the first capacitor and either the first power supply terminal or the second power supply terminal; a diode connected in parallel with the resistive element between the power supply terminal and the first capacitor; Further comprising: The direction in which the diode passes a current is a direction from the high potential side of the first capacitor to the power supply terminal.

6. An auxiliary power supply as claimed in claim 5.

7. the first capacitor discharges a discharge current in response to discharging of the smoothing capacitor when the first smoothing capacitor terminal is connected to the first power supply terminal and the second smoothing capacitor terminal is connected to the second power supply terminal; 7. An auxiliary power supply device according to claim 5 or 6.

8. The auxiliary power supply circuit unit includes: a charge / discharge circuit unit including the first capacitor; a constant current circuit section that outputs a current of a predetermined magnitude based on a voltage applied from the smoothing capacitor or the first capacitor; a constant voltage circuit section that outputs a voltage of a predetermined magnitude based on the current output from the constant current circuit section; a voltage determination circuit that determines whether or not a detected voltage of the first capacitor or a detected voltage of the smoothing capacitor is lower than a reference voltage that is generated based on a voltage output from the constant voltage circuit; a notification circuit unit that notifies information indicating a result of the determination by the voltage determination circuit unit; Equipped with The other circuit unit includes the notification circuit unit. An auxiliary power supply according to any one of claims 5 to 7.

9. The power supply device comprises an auxiliary power supply device according to any one of claims 1 to 8, power supply.

10. An auxiliary power supply device according to any one of claims 1 to 8; The power supply device; A medical device connected as a load to the power supply; A medical system that has:

11. The power supply device includes a fuse or a breaker provided in at least one of two input transmission paths on the primary side of the power supply device. The medical system of claim 10.

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