JP7439875B1 - power system - Google Patents

Abstract

An object of the present invention is to provide a power supply system that can suppress a decrease in charging and discharging capacity when replacing a power storage device.
A power supply system includes a solar cell, a load electrically connected to the solar cell, and a first power supply system provided between the solar cell and the load and electrically connected to each of the solar cell and the load. A power supply system comprising: a power storage device; a first DCDC converter provided in parallel with the first power storage device between the solar cell and the load; It has a second power storage device for replacement that can be attached and detached. The first capacitor has charging characteristics capable of charging the maximum power generated by the solar cell, and discharge characteristics capable of supplying the maximum power consumption of the load.
[Selection diagram] Figure 1

Description

The present disclosure relates to power supply systems.

BACKGROUND ART Power supply systems that utilize solar power generation are conventionally known (for example, see Patent Document 1).

For example, in a power supply system in which a power storage device is connected between a solar cell and a load (in other words, a solar cell and a power storage device are connected in parallel to the load), the amount of power generated by the solar cell is equal to the power consumption of the load. If the amount of power generated by the solar cells is smaller than the amount of power consumed by the load, the power generated by the solar cells (hereinafter referred to as generated power) is supplied to the load and charged to the storage device, and if the amount of power generated by the solar cells is smaller than the power consumption of the load, In addition to the power generated by the solar cells, the power stored in the capacitor is also supplied to the load.

JP2014-206781A

When a replaceable capacitor is used in the conventional power supply system described above, there is a temporary reduction in charging and discharging capacity while the capacitor is being replaced. This causes problems such as, for example, not being able to charge the power generated by the solar cell or insufficient power supply to the load.

An object of one aspect of the present disclosure is to provide a power supply system that can suppress a decrease in charging and discharging capacity when replacing a power storage device.

A power supply system according to one aspect of the present disclosure is provided between a solar cell, a load electrically connected to the solar cell, and the solar cell and the load, and is provided between each of the solar cell and the load. A power supply system comprising : a first capacitor that is electrically connected and has a charging characteristic capable of charging the maximum generated power of the solar cell and a discharging characteristic capable of supplying the maximum power consumption of the load ; a first DCDC converter provided in parallel with the first power storage device between the solar cell and the load and electrically connected to each of the solar cell and the load; and a replacement converter that can be attached to and detached from the first DCDC converter. a control device that monitors whether the state of charge of the second capacitor and the first capacitor is within a range in which the charging characteristics and the discharging characteristics can be exhibited; a notification device that performs at least one of the following notifications, and the control device is configured to send a notification to prompt replacement of the second capacitor based on the state of charge of the first capacitor. Control the device .

According to the present disclosure, it is possible to suppress a decrease in charging and discharging ability when replacing a power storage device.

A diagram schematically showing a configuration example of a power supply system according to an embodiment of the present disclosure A diagram schematically showing a configuration example of a control device according to Modifications 1 to 3 of the present disclosure. A diagram schematically showing a configuration example of a power supply system according to Modification 2 of the present disclosure. A diagram schematically showing a configuration example of a power supply system according to Modification 3 of the present disclosure.

Embodiments of the present disclosure will be described below with reference to the drawings. Note that common constituent elements in each figure are designated by the same reference numerals, and their descriptions will be omitted as appropriate.

The configuration of a power supply system 1 according to this embodiment will be explained using FIG. 1. FIG. 1 is a diagram schematically showing a configuration example of a power supply system 1 according to the present embodiment.

A power supply system 1 shown in FIG. 1 is a power supply system that uses solar power generation. Note that the power supply system 1 may be used in a stationary manner, or may be used in a mobile body (for example, a car).

As shown in FIG. 1, the power supply system 1 includes a solar cell 10, a load 20, a fixed power storage device 30, a DC/DC converter 40, and a replacement power storage device 50.

The solar cell 10 is a device that generates electric power (DC power) upon irradiation with sunlight. As the solar cell 10, a known device can be applied, so a detailed description thereof will be omitted here.

The load 20 is a device that performs a predetermined operation using the supplied power. The load 20 may be, for example, an in-vehicle device, a combination of a DC/DC converter and a USB (Universal Serial Bus) device, or a combination of a DCAC converter and a home appliance.

As shown in FIG. 1, a solar cell 10, a fixed capacitor 30, and a DC/DC converter 40 are connected in parallel to a load 20.

Fixed capacitor 30 is a capacitor that is fixedly provided in power supply system 1 and is not replaced. Examples of the fixed power storage device 30 include, but are not limited to, batteries.

As shown in FIG. 1, fixed power storage device 30 is provided between solar cell 10 and load 20, and is electrically connected to solar cell 10 and load 20, respectively. Fixed power storage device 30 charges the power generated by solar cell 10 and supplies the charged power to load 20 .

Furthermore, the fixed power storage device 30 has a charging characteristic capable of charging the maximum generated power of the solar cell 10 and a discharging characteristic capable of supplying the maximum power consumption of the load 20.

The replacement capacitor 50 is a replaceable capacitor that is detachably attached to the DCDC converter 40 . Examples of the replacement power storage device 50 include, but are not limited to, batteries.

As shown in FIG. 1, replacement power storage device 50 is connected in series to DCDC converter 40. Replacement capacitor 50 charges the power generated by solar cell 10 and supplies the charged power to load 20 .

The DCDC converter 40 is a device that adjusts voltage.

As shown in FIG. 1, DCDC converter 40 is provided in parallel with fixed power storage device 30 between solar cell 10 and load 20, and is electrically connected to each of solar cell 10 and load 20. Further, the DCDC converter 40 is electrically connected to a replacement power storage device 50.

For example, if the fixed power storage device 30 is in a low SOC state (which may include a fully discharged state where the SOC is 0%) and the amount of power generated by the solar cell 10 is less than the amount of power consumed by the load 20, the DCDC converter 40 adjusts the voltage on the load 20 side of the DCDC converter 40 so that the electric power of the replacement capacitor 50 is supplied to the load 20 via the DCDC converter 40. At this time, the voltage is adjusted in accordance with the required charging amount of the fixed capacitor 30 (specifically, the voltage is adjusted so that it does not exceed the allowable charging current amount of the fixed capacitor 30).

For example, if the fixed power storage device 30 is in a high SOC state (which may include a fully charged state where the SOC is 100%) and the amount of power generated by the solar cell 10 is greater than the amount of power consumed by the load 20, the DCDC converter 40 adjusts the voltage on the replacement capacitor 50 side of the DCDC converter 40 so that the power of the solar cell 10 is supplied to the replacement capacitor 50 via the DCDC converter 40. At this time, the voltage is adjusted according to the required charging amount of the replacement power storage device 50 (specifically, the voltage is adjusted so that it does not exceed the allowable charging current amount of the replacement power storage device 50).

Note that the operation of the DCDC converter 40 may be controlled by a control device (not shown) (for example, the control device 100 in FIG. 2 described later).

The configuration of the power supply system 1 has been described above.

As described above, the power supply system 1 of the present embodiment includes a solar cell 10, a load 20 electrically connected to the solar cell 10, and a solar cell 10 provided between the solar cell 10 and the load 20. 10 and a load 20, and a first power storage device (for example, a fixed power storage device 30), the power supply system is provided in parallel with the first power storage device between the solar cell 10 and the load 20. a first DCDC converter (DCDC converter 40) which is electrically connected to the solar cell 10 and the load 20, and a second replacement power storage device (for example, a replacement power storage device 50) that is attached to and detached from the first DCDC converter; It is characterized by having the following.

Due to this feature, when the fixed capacitor 30 is in a low SOC state and the power generation amount of the solar cell 10 is less than the power consumption of the load 20, the replacement capacitor 50 in a high SOC state can be used for replacement. Power generated by the power storage device 50 is supplied to the load 20 via the DCDC converter 40. On the other hand, if the fixed capacitor 30 is in a high SOC state and the amount of power generated by the solar cell 10 is greater than the amount of power consumed by the load 20, by using the replacement capacitor 50 in a low SOC state, Power generated by battery 10 is supplied to replacement power storage device 50 via DCDC converter 40 . Therefore, the power generated by the solar cell 10 can be charged without waste, and the operating rate of the load 20 can be ensured without requiring an external power supply.

Further, in the power supply system 1 of the present embodiment, the first power storage device (for example, the fixed power storage device 30) has a charging characteristic capable of charging the maximum generated power of the solar cell 10 and a capability of supplying the maximum power consumption of the load 20. It is characterized by having discharge characteristics.

Due to this feature, temporary power consumption during replacement of the replacement capacitor 50 (until the replacement capacitor 50 connected to the DCDC converter 40 is removed and a new replacement capacitor 50 is connected to the DCDC converter 40) Decrease in charge/discharge capacity can be suppressed. Therefore, when replacing the replacement capacitor 50, it is possible to solve problems such as not being able to charge the power generated by the solar cell 10 or insufficient power supply to the load.

Note that the present disclosure is not limited to the description of the embodiments described above, and various modifications can be made without departing from the spirit thereof. Modifications will be described below.

[Modification 1]
Replacement power storage device 50 may be replaced manually, for example. In this case, the power supply system 1 prompts the user to replace the replacement capacitor 50 based on a notification device that provides at least one of a visual notification and an audible notification to the user and the state of charge of the fixed capacitor 30. and a control device that controls the notification device to issue a notification.

Examples of the notification device include a lamp, a display, a speaker, and the like. Note that the notification device may be a combination of a lamp or a display and a speaker. Examples of visual notifications include lighting (including blinking) of a lamp and displaying a predetermined image on a display. An example of the auditory notification is the output of audio (including a warning sound) from a speaker.

Here, the configuration of the control device 100 will be explained using FIG. 2. FIG. 2 is a diagram schematically showing a configuration example of the control device 100.

Although not shown, the control device 100 includes hardware such as a main storage device such as a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory), and a computer program. It has auxiliary storage devices such as hard disks and flash memory, and buses that connect them. The functions of the control device 100 described below are realized by the CPU loading a computer program read from the auxiliary storage device into the RAM of the main storage device and executing the program.

The control device 100 includes a monitoring section 110 and a control section 120.

The monitoring unit 110 receives notifications of detection results from a battery sensor (not shown) that detects the SOC of the fixed capacitor 30 from time to time, and based on the notification, the SOC of the fixed capacitor 30 is equal to or higher than the first threshold, and 2. Monitor whether it is below the threshold value.

The first threshold value and the second threshold value are preset values. The second threshold is greater than the first threshold. For example, the first threshold value is a value slightly larger than the lower limit value of the SOC range where input/output restrictions are not applied. On the other hand, the second threshold value is a value slightly smaller than the upper limit value of the SOC range where no input/output restriction is applied. Note that the first threshold value may be the lower limit value of the above SOC range, and the second threshold value may be the upper limit value of the above SOC range.

The range of the first threshold value or more and the second threshold value or less is defined as a range that can exhibit charging characteristics capable of charging the maximum generated power of the solar cell 10 and discharging characteristics capable of supplying the maximum power consumption of the load 20. You can say it. Alternatively, the above-mentioned SOC range may be referred to as a range capable of exhibiting charging characteristics capable of charging the maximum generated power of the solar cell 10 and discharging characteristics capable of supplying the maximum power consumption of the load 20.

Furthermore, the monitoring unit 110 monitors the amount of power generated by the solar cell 10 and the amount of power consumed by the load 20, and monitors whether the amount of power generated by the solar cell 10 is greater than the amount of power consumed by the load 20.

When the SOC of the fixed power storage device 30 is lower than the first threshold (that is, the fixed power storage device 30 is in a low SOC state) and the amount of power generated by the solar cell 10 is less than the power consumption amount of the load 20, the control unit 120 determines that the SOC is high. The above-mentioned notification device (not shown) is controlled so as to issue a notification to prompt replacement of the current state with the replacement power storage unit 50.

On the other hand, when the SOC of the fixed power storage device 30 exceeds the second threshold (that is, the fixed power storage device 30 is in a high SOC state) and the amount of power generated by the solar cell 10 is greater than the amount of power consumed by the load 20, The above-mentioned notification device is controlled so as to issue a notification urging replacement to a replacement capacitor 50 in a low SOC state.

In this modification, a user (for example, a worker) can know that it is time to replace the replacement power storage device 50. The user can also know the type of replacement power storage device 50 to be replaced (replacement power storage device 50 in a high SOC state or replacement power storage device 50 in a low SOC state). Therefore, the user can easily replace the replacement power storage device 50.

Note that, as described in the embodiment, the control device 100 performs the voltage adjustment described above based on the monitoring results of the SOC of the fixed capacitor 30, the amount of power generated by the solar cell 10, and the amount of power consumed by the load 20. The DC/DC converter 40 may be controlled accordingly.

[Modification 2]
For example, the replacement power storage device 50 may be replaced by a device (machine). In this case, the power supply system 1 includes a replacement device that replaces the replacement capacitor 50 and a control device that controls the replacement device to replace the replacement capacitor 50 based on the state of charge of the fixed capacitor 30. May have.

The replacement device removes the replacement capacitor 50 connected to the DCDC converter 40 and replaces it with a plurality of replacement capacitors 50 prepared in advance (for example, at least one replacement capacitor 50 in a high SOC state and at least one low SOC state). This device connects one of the state replacement capacitors 50 to the DC/DC converter 40. Since a known device can be used as the exchange device, detailed description thereof will be omitted here.

As the control device of this modification, the control device 100 shown in FIG. 2 can be used.

The operation of the monitoring unit 110 is the same as that in Modification 1, so a description thereof will be omitted here.

When the SOC of the fixed power storage device 30 is lower than the first threshold (that is, the fixed power storage device 30 is in a low SOC state) and the amount of power generated by the solar cell 10 is less than the power consumption amount of the load 20, the control unit 120 determines that the SOC is high. The above-mentioned exchange device (not shown) is controlled to execute the exchange of the state to the replacement power storage unit 50.

On the other hand, when the SOC of the fixed power storage device 30 exceeds the second threshold (that is, the fixed power storage device 30 is in a high SOC state) and the amount of power generated by the solar cell 10 is greater than the amount of power consumed by the load 20, The above-mentioned exchange device is controlled so as to execute the exchange with the replacement power storage unit 50 in a low SOC state.

Note that in this modification, the SOC of each of the plurality of replacement power storage devices 50 prepared in advance is known to the control unit 120. Thereby, the control unit 120 can instruct the replacement device as to the type of replacement capacitor 50 to be replaced, so that the replacement device selects an appropriate replacement capacitor 50 from among the plurality of replacement capacitors 50 prepared in advance. Electrical storage device 50 can be selected.

In this modification, it is possible to replace the replacement capacitor 50 with an appropriate SOC at an appropriate timing without manual intervention.

[Modification 3]
Replacement power storage device 50 may be replaced by, for example, switching a switch. In this case, the power supply system 1 includes a plurality of replacement capacitors 50 provided in parallel, a plurality of switches provided for each power supply path between each of the replacement capacitors 50 and the DC/DC converter 40, and a fixed capacitor 50. and a control device that turns each of the plurality of switches on/off based on the charging state of the battery.

Here, the configuration of the power supply system 1 of this modification will be described using FIG. 3. FIG. 3 is a diagram schematically showing a configuration example of the power supply system 1 of this modification.

As shown in FIG. 3, three replacement capacitors 50 are provided in parallel to one DC/DC converter 40. Hereinafter, the replacement capacitor 50 illustrated on the leftmost side will be referred to as the "first replacement capacitor 50," the replacement capacitor 50 illustrated in the center will be referred to as the "second replacement capacitor 50," and the one on the far right will be referred to as the "first replacement capacitor 50." The replacement capacitor 50 illustrated in is referred to as the "third replacement capacitor 50".

Further, as shown in FIG. 3, a switch SW1 is provided in the power supply path (not shown) between the first replacement electricity storage device 50 and the DC/DC converter 40. A switch SW2 is provided in the power supply path (not shown) between the second replacement electricity condenser 50 and the DCDC converter 40. A switch SW3 is provided in the power supply path (not shown) between the third replacement electricity storage device 50 and the DCDC converter 40.

As the control device of this modification, the control device 100 shown in FIG. 2 can be used.

The operation of the monitoring unit 110 is the same as that in Modification 1, so a description thereof will be omitted here.

The control unit 120 recognizes the SOC of each of the first to third replacement capacitors 50, for example, based on a notification from a battery sensor (not shown). Here, as an example, it is assumed that the second replacement capacitor 50 is in a high SOC state and the third replacement capacitor 50 is in a low SOC state. Further, for example, it is assumed that the SOC of the first replacement power storage device 50 is approximately intermediate between the SOC of the second replacement power storage device 50 and the SOC of the third replacement power storage device 50.

Also, here, as an example, the first replacement capacitor 50 is connected to the DCDC converter 40 (switch SW1 is on), and the second and third replacement capacitors 50 are not connected to the DCDC converter 40 (switch SW2 , 3 is off).

When the SOC of the fixed power storage device 30 is lower than the first threshold (that is, the fixed power storage device 30 is in a low SOC state) and the amount of power generated by the solar cell 10 is less than the power consumption amount of the load 20, the control unit 120 determines that the SOC is high. The switches SW1 and SW3 are turned off and the switch SW2 is turned on so that the second replacement power storage capacitor 50 is replaced.

On the other hand, when the SOC of the fixed power storage device 30 exceeds the second threshold (that is, the fixed power storage device 30 is in a high SOC state) and the amount of power generated by the solar cell 10 is greater than the amount of power consumed by the load 20,
Switches SW1 and SW2 are turned off, and switch SW3 is turned on so that the third replacement power storage capacitor 50 is replaced with a low SOC state.

In this modification, it is possible to replace the replacement capacitor 50 with an appropriate SOC at an appropriate timing without manual intervention.

[Modification 4]
In the embodiment, the power supply system 1 has been described using an example in which the fixed power storage device 30 is provided, but the power supply system 1 is not limited thereto. A configuration example in which the fixed capacitor 30 is not provided will be described below using FIG. 4. FIG. 4 is a diagram schematically showing a configuration example of the power supply system 1 of this modification.

As shown in FIG. 4, in the power supply system 1 of this modification, one more set of a DCDC converter 40 and a replacement power storage device 50 is provided in place of the fixed power storage device 30 shown in FIG.

The power supply system 1 shown in FIG. 1 has the characteristics that the charging/discharging efficiency on the fixed capacitor 30 side is high and that the voltage of the load system changes depending on the SOC of the fixed capacitor 30. On the other hand, in the power supply system 1 shown in FIG. 4, the charging/discharging efficiency on the side of the replacement capacitor 50 is low, and the voltage of the load system is stabilized by the DCDC converter 40 (there is no influence of the voltage of the replacement capacitor 50). There is a characteristic that

Note that in this modification, one of the two replacement power condensers 50 corresponds to an example of a "first power condenser" and the other corresponds to a "second power condenser". Furthermore, of the two DCDC converters 40, the one to which the second capacitor is attached/detached corresponds to the "first DCDC converter", and the one to which the first capacitor is attached/detached corresponds to the "second DCDC converter".

The modified examples have been described above. Note that the above-described modifications can be combined as appropriate.

The power supply system of the present disclosure is useful for a power supply system including a solar cell, a load, and a power storage device.

1 Power supply system 10 Solar cell 20 Load 30 Fixed capacitor 40 DCDC converter 50 Replacement capacitor 100 Control device 110 Monitoring section 120 Control section

Claims (5)

a solar cell, a load electrically connected to the solar cell, and a solar cell provided between the solar cell and the load, electrically connected to each of the solar cell and the load; A power supply system comprising: a first power storage device having a charging characteristic capable of charging generated power; and a first power storage device having a discharging characteristic capable of supplying the maximum power consumption of the load ;
a first DC/DC converter provided in parallel with the first power storage device between the solar cell and the load and electrically connected to each of the solar cell and the load;
a second storage battery for replacement that is detachable from the first DC/DC converter;
a control device that monitors whether the state of charge of the first capacitor is within a range in which the charging characteristics and the discharging characteristics can be exhibited;
a notification device that provides at least one of a visual notification and an audible notification to the user ;
The control device includes:
controlling the notification device to issue a notification prompting replacement of the second power storage device based on the state of charge of the first power storage device ;
power system. further comprising a replacement device for replacing the second power storage device,
The control device includes:
controlling the replacement device to replace the second power storage device based on the state of charge of the first power storage device;
The power supply system according to claim 1 . A plurality of the second capacitors are provided in parallel,
further comprising a plurality of switches provided for each power supply path between each of the second capacitors and the first DC/DC converter,
The control device includes:
switching on/off of each of the plurality of switches so that the second capacitor is replaced based on the state of charge of the first capacitor;
The power supply system according to claim 1 . The first capacitor is a fixed capacitor,
The power supply system according to claim 1. further comprising a second DCDC converter provided in parallel with the first DCDC converter between the solar cell and the load and electrically connected to each of the solar cell and the load;
The first capacitor is a replacement capacitor that is attached to and detached from the second DC/DC converter,
The power supply system according to claim 1.

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