JP2021191154A - Portable power supply - Google Patents

Abstract

To enable the supply of a current larger than an allowable current specified by the specifications of a power supply such as a commercial power supply and a generator, and make it easy to use equipment with large current consumption without additional work.SOLUTION: A portable power supply 1 is equipped with a full-wave rectifier circuit 32, a storage battery 40, and an inverter circuit 50. The inverter circuit 50 converts a current input from both the storage battery 40 and the full-wave rectifier circuit 32 into an AC current larger than the allowable current consumption of an AC power supply 200 and outputs the current.SELECTED DRAWING: Figure 2

Description

The present invention relates to a portable power supply device including a storage battery.

For example, in the construction of a construction work site, there is a case where you want to use an electric device with a rated current exceeding 15A. In this case, if you try to operate by taking power from an outlet with a specification of 125V 15A, an overcurrent circuit breaker The power is cut off and the device cannot be operated. Further, even if the rated current is 15 A or less, when used at the same time as other devices, if the total current exceeds 15 A, the power supply is cut off and a plurality of devices cannot be operated as in the above case. , The construction using these devices was stopped.

Further, conventionally, an uninterruptible power supply device for preventing a power failure in the event of a power failure has been known. There are a plurality of types of uninterruptible power supply, and one of them is known as a constant inverter power supply type device. In the constant inverter power supply method, the alternating current of the commercial power supply is normally converted to direct current, a part of which is used to charge the storage battery as needed, and the rest is converted to alternating current by the inverter circuit and supplied to the equipment. .. On the other hand, when the commercial power supply is cut off during a power outage, the power stored in the storage battery can be converted to alternating current by the above inverter circuit and supplied to the equipment, so the current supplied to the equipment is suddenly cut off. (For example, see Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-07551

By the way, as in the construction work site mentioned above, when the total current consumption of a single device or a plurality of devices exceeds the allowable current consumption of the outlet at the site where the electric device is used, the high output is generated by another route. Additional work was done to install possible wiring and a high-capacity overcurrent circuit breaker, or the load was suppressed so that the current consumption of the equipment or the total current consumption of multiple equipment did not exceed 15A. Was the actual situation.

However, if the original construction period is short, it becomes difficult to secure the above-mentioned additional construction period, and the original construction must be interrupted during the above-mentioned additional construction period, which causes a problem regarding the construction period. .. In addition, if the above-mentioned additional work is performed when the original work cost is low, the ratio of the additional work cost becomes high, which is uneconomical. Further, in the case of work in which the load on the equipment is suppressed, there are problems that the desired work cannot be performed because the performance of the equipment cannot be fully exhibited, or the work is inefficient and the work time is increased.

On the other hand, if an uninterruptible power supply as in Patent Document 1, for example, is used, the power of the storage battery can be supplied to the device when the commercial power supply is cut off. However, in general, the output current of the inverter circuit of the uninterruptible power supply is equal to or less than the allowable current consumption of the commercial power supply. In other words, there was no idea to output a current that exceeds the allowable current of the outlet from the uninterruptible power supply, so if the total current consumption of a single device or multiple devices exceeds the allowable current of the outlet, there is no power failure. The power supply didn't make sense.

Further, for example, at a construction work site, a power source may be secured by a generator. Even in the case of a generator, the maximum current that can be supplied is predetermined, and the generator that can supply a large current becomes large and heavy, which is a problem in terms of securing a place for introduction to the construction site and cost. Will be.

The present invention has been made in view of this point, and an object thereof is to enable the supply of a current larger than the allowable current predetermined by the specifications of a power source such as a commercial power source or a generator. The purpose is to make it easy to use equipment that consumes a large amount of current without additional work.

In order to achieve the above object, the first disclosure relates to a power supply connection portion connected to an AC power supply and a rectifying circuit for converting a current input from the power supply connection portion into a DC in a portable power supply device having a storage battery. From both the charging circuit that supplies the current output from the rectifying circuit to the storage battery, the inverter circuit that can simultaneously input the current output from both the storage battery and the rectifying circuit, and the storage battery and the rectifying circuit. It is provided with a control unit that controls the inverter circuit so that the current input to the inverter circuit is converted into an AC current larger than the allowable current consumption of the AC power supply and output from the inverter circuit. It is characterized by.

According to this configuration, the current input from the AC power supply is converted into direct current by the rectifier circuit and then supplied to the storage battery via the charging circuit to charge the storage battery. A direct current converted to direct current by the rectifier circuit and a direct current discharged from the storage battery are simultaneously input to the inverter circuit. The inverter circuit can convert the input DC current into an AC current larger than the allowable current consumption of the AC power supply and output it. For example, assuming that the allowable current consumption of the AC power supply is 15 A, the current output from the inverter circuit can be made larger than 15 A. This makes it possible to simultaneously use a device having a current consumption of more than 15 A and a plurality of devices having a total current consumption of more than 15 A without performing additional work for power supply wiring and installation of a high-capacity overcurrent circuit breaker.

Further, when the AC power source is a generator, a current larger than the maximum current that can be supplied by the generator can be output from the above inverter circuit, so that the device having a large current consumption can be used without increasing the size of the generator. It can be used.

Only the direct current discharged from the storage battery may be input to the inverter circuit without connecting the portable power supply to the commercial power supply.

The second disclosure is characterized in that the maximum value of the input side current consumption of the rectifier circuit can be changed.

That is, it is conceivable that a device that consumes power different from that of the portable power supply device is connected to the AC power supply. In this case, if the power consumption of the portable power supply device is large, the total current consumption of another device may exceed the allowable current consumption of the AC power supply, and as a result, the power supply may be cut off.

According to the second disclosure, the maximum value of the input side current consumption of the rectifier circuit of the portable power supply device can be lowered according to the current consumption of another device. In addition, when another device is not connected to the AC power supply, the maximum value of the input side current consumption of the rectifier circuit can be increased to the allowable current value of the AC power supply, which makes it a portable power supply device. The usable time of the connected device can be extended.

The third disclosure includes an estimation unit that estimates the usage status of other devices connected to the AC power supply, and the control unit is described according to the usage status of other devices estimated by the estimation unit. It is characterized in that it is configured to change the magnitude of the input side current consumption of the rectifier circuit.

According to this configuration, when a device that consumes power other than the portable power supply device is connected to the AC power supply, the current consumed by the other device can be estimated by the estimation unit. If the current consumption of other equipment estimated by the estimation unit is large, the input side current consumption of the rectifier circuit is automatically reduced, and conversely, if the current consumption of other equipment estimated by the estimation unit is small, the rectifier circuit The current consumption on the input side of is automatically increased.

The fourth disclosure includes a voltage detection circuit that detects a voltage input to the power supply connection unit, and the estimation unit estimates the usage status of other devices based on the voltage detected by the voltage detection circuit. It is characterized in that it is configured as follows.

For example, if the current consumption of another device connected to the AC power supply is large, the voltage input to the power supply connection will be low, and conversely if the current consumption of the other device connected to the AC power supply is small, the power supply will be connected. The voltage input to the unit becomes high. That is, by detecting the voltage input to the power supply connection portion by the voltage detection circuit, it is possible to estimate the usage status of other devices.

In the fifth disclosure, the estimation unit is configured to estimate the usage status of other equipment based on the voltage detected by the voltage detection circuit when the current output from the rectifier circuit is cut off. It is characterized by that.

According to this configuration, based on the voltage detected by the voltage detection circuit when the current output from the rectifier circuit is cut off, the amount consumed by the portable power supply device does not affect the detection voltage. The usage status of the equipment can be estimated accurately.

The sixth disclosure is characterized by including a maximum value setting volume for setting the maximum value of the input side current consumption of the rectifier circuit.

According to this configuration, the user of the portable power supply device can set the maximum value of the input side current consumption of the rectifier circuit to an arbitrary value by operating the maximum value setting volume. For example, if another device connected to the AC power supply is known, the maximum value of the input side current consumption of the rectifier circuit can be manually set according to the current consumption of that device. If it is unclear whether or not other devices are connected to the AC power supply, or if the current consumption of other devices connected to the AC power supply is unknown, the estimation unit makes an estimation and estimates the current consumption. Based on the result, the maximum value of the input side current consumption of the rectifier circuit may be changed.

The seventh disclosure includes a charge / discharge status detection unit that detects the charge / discharge status of the storage battery in a predetermined period, and the control unit has a predetermined charge / discharge status of the storage battery detected by the charge / discharge status detection unit. When it is determined that the charge / discharge current value is equal to or higher than the predetermined charge / discharge frequency, charging by the charging circuit is prohibited, or current output from the inverter circuit is prohibited.

For example, depending on the operation of the device connected to the portable power supply device, it is conceivable that the storage battery is frequently charged and discharged in a predetermined short period of time. If the storage battery is frequently charged and discharged, the storage battery may generate heat and become a temperature state unsuitable for charging and discharging. In the present disclosure, it is possible to determine whether or not the storage battery is in a temperature state unsuitable for charging / discharging based on the charging / discharging status of the storage battery, and when the storage battery is in such a temperature state, it is automatically charged / discharged. Therefore, it is possible to prevent abnormal overheating of the storage battery and extend the life of the storage battery.

Eighth disclosure includes an inverter current detection unit that detects a current on the output side of the inverter circuit, and the control unit includes a current value detected by the inverter current detection unit when the current value exceeds a predetermined current value. It is characterized in that the output voltage of the inverter circuit is lowered so that the output of the inverter circuit becomes equal to or less than a predetermined current value.

For example, when a device equipped with a commutator motor is connected to a portable power supply device, an inrush current flows when the motor is started. This inrush current is a current that greatly exceeds the allowable current consumption of the AC power supply. When the inrush current flows, the allowable current consumption of the AC power supply is limited, so the shortfall will be supplemented by the power output from the storage battery. In the present disclosure, when an extremely large current value such as an inrush current is detected, the output voltage of the inverter circuit can be automatically lowered so as to be equal to or less than a predetermined current value. As a result, it is possible to suppress unnecessary consumption of the storage battery and extend the usable time of the portable power supply device.

As described above, according to the present disclosure, the current output from both the rectifying circuit that converts the current of the AC power supply to direct current and the storage battery is simultaneously input to the inverter circuit, and the current consumption of the AC power supply is higher than the allowable current consumption of the AC power supply. Since a large alternating current can be output from the inverter circuit, equipment with a large current consumption can be easily used without the need for additional work.

It is a figure which shows the portable power-source device and each device which concerns on embodiment of this invention. It is a block diagram of the said portable power supply device. It is a flowchart of the microcomputer control circuit which the said portable power-source device has.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is essentially merely an example and is not intended to limit the present invention, its application or its use.

FIG. 1 is a diagram showing a portable power supply device 1 and devices 100 and 110 according to an embodiment of the present invention. The portable power supply device 1 is suitably used in sites where the electric device 100 is used, such as various construction work sites, civil engineering work sites, factories, and various work sites. The portable power supply device 1 is small and lightweight so that an operator can carry it by himself, and is considered to be a power source with good portability.

The device 100 can be connected to the portable power supply device 1. The device 100 is a device that operates by supplying electric power, and is not particularly limited, and examples thereof include an electric drill, a cutting machine, a vacuum cleaner, and a lighting device. The commutator motor may be mounted on the device 100.

Although only one device 100 is shown in FIG. 1, a plurality of devices 100 can be connected to the portable power supply device 1. The portable power supply device 1 is provided with a storage battery 40 (shown in FIG. 2), and can receive power from a commercial power source 200 or a generator and store power in the storage battery 40. The portable power supply device 1 uses both the power from the commercial power supply 200 and the generator and the power from the storage battery for the connected device 100, and is more than the allowable current consumption of the commercial power supply 200 and the generator. Is also configured to allow a large alternating current to flow.

The commercial power supply 200 is an alternating current power supply that supplies an alternating current. The commercial power supply 200 is provided with a plurality of outlets 201. As the AC power source, for example, a generator can be used in addition to the commercial power source 200, and this generator also has a plurality of outlets. In the following description, the case where the AC power supply is a commercial power supply 200 will be described, but it is of course possible to replace the commercial power supply 200 with a generator.

Hereinafter, the configuration of the portable power supply device 1 will be specifically described. As shown in FIG. 1, the portable power supply device 1 includes a housing 2 and a plug 4 provided in a power cord 3 extending from the housing 2. The plug 4 is configured to be pluggable into an outlet 201 provided in the commercial power supply 200 (shown in FIG. 2), and is connected to the commercial power supply 200 in a state of being plugged into the outlet 201. The power cord 3 and the plug 4 constitute a power connection unit 5.

Of the plurality of outlets 201 of the commercial power supply 200, the plug 4 of the portable power supply device 1 can be inserted into one outlet 201, and the plug 114 of the device 110 different from the device 100 can be inserted into the other outlet 201. Can be plugged in. Another device 110 is also an electric device, and may be a device having the same structure as the above device 100, or may be a device having a different structure. Another device 110 is provided with an internal circuit 115 (shown in FIG. 2). Although not shown, the number of outlets 201 of the commercial power supply 200 may be 3 or more, and in this case, a plurality of different devices 110 may be connected to the outlets 201, respectively. Another device 110 may be connected to the outlet 201, for example, via an extension cord.

As shown in FIG. 2, an overcurrent circuit breaker 202 is provided between the commercial power supply 200 and the outlet 201. The overcurrent circuit breaker 202 is a device that cuts off the current when the current value flowing through the outlet 201 reaches a preset current value, and is a generally used device. The current value is usually set to 15A or 20A. For example, when set to 15A, the specification of the outlet 201 can be 125V 15A, and the allowable current consumption of the commercial power supply 200 is 15A.

As shown in FIG. 1, the front panel 2a of the housing 2 has a power switch 20 (not shown in FIG. 2), an inrush current suppression switch 21, an automatic / manual changeover switch 22 for the maximum current value, and a maximum current value setting. A volume 23 and an output voltage adjusting volume 24 are provided. Further, the front panel 2a is provided with an input power supply abnormality lamp 25 and a charge / discharge abnormality lamp 26, and is also provided with an outlet 27 to which the device 100 is connected. Although only one outlet 27 is shown in FIGS. 1 and 2, a plurality of outlets 27 may be provided.

As shown in FIG. 2, the portable power supply device 1 includes a full-wave rectifier circuit 32 that converts a single-phase alternating current input from the power supply connection unit 5 into a direct current. Further, the portable power supply device 1 includes a microcomputer control circuit 30. The microcomputer control circuit 30 includes a central processing unit (CPU) and a storage device (RAM, ROM, etc.), processes various input signals according to a predetermined program, outputs various control signals, and controls each unit. do. Specifically, the microcomputer control circuit 30 constitutes, in addition to the control unit 30a, an estimation unit 30b and a charge / discharge status detection unit 30c, which will be described later. The control unit 30a, the estimation unit 30b, and the charge / discharge status detection unit 30c can be realized by, for example, being configured by hardware such as an electric circuit or by signal processing by executing a program.

The power switch 20 (not shown in FIG. 2), the inrush current suppression switch 21, the automatic / manual changeover switch 22 for the maximum current value, the maximum current value setting volume 23, the output voltage adjustment volume 24, and the input to the microcomputer control circuit 30. The power supply abnormality lamp 25 and the charge / discharge abnormality lamp 26 are connected. The microcomputer control circuit 30 detects the operation state of the power switch 20, the inrush current suppression switch 21, and the automatic / manual changeover switch 22 of the maximum current value, and also sets the setting state of the maximum current value setting volume 23 and the output voltage adjustment volume 24. To detect. The microcomputer control circuit 30 also controls the lighting of the input power supply abnormality lamp 25 and the charge / discharge abnormality lamp 26. These will be described later.

The portable power supply device 1 includes a voltage detection circuit 31 that detects a voltage input to the power supply connection unit 5. The circuit configuration of the voltage detection circuit 31 can be a conventionally known circuit configuration. The voltage detection circuit 31 can detect the voltage input to the power supply connection unit 5 at least when the current output from the full-wave rectifier circuit 32 is cut off. The voltage detection circuit 31 may detect the voltage input to the power supply connection unit 5 while the current is output from the full-wave rectifier circuit 32.

The voltage detected by the voltage detection circuit 31 is input to the estimation unit 30b provided in the microcomputer control circuit 30. The estimation unit 30b is a unit that estimates the usage status of the other device 110 connected to the outlet 201 based on the voltage detected by the voltage detection circuit 31. The usage status of the other device 110 is whether or not a current is flowing through the other device 110, and how much the current is consumed when the current is flowing through the other device 110.

The voltage detection value used when estimating the usage status of the other device 110 is the value detected by the voltage detection circuit 31 when the current output from the full-wave rectifier circuit 32 is cut off. That is, when a device 110 that consumes power different from that of the portable power supply device 1 is connected to the commercial power supply 200, another device 110 is operating and current is flowing to the other device 110. There is. When a current is flowing through another device 110, the voltage input to the power supply connection unit 5 is lower than when the current is not flowing, and the voltage is larger if the current flowing through the other device 110 is larger. It gets lower. That is, by detecting the voltage input to the power supply connection unit 5, it is possible to estimate whether or not a current is flowing through the other device 110, and it is possible to estimate the current consumption of the other device 110.

Here, when the current is output from the full-wave rectifier circuit 32, the voltage detected by the voltage detection circuit 31 changes depending on the magnitude of the current output from the full-wave rectifier circuit 32. For example, the larger the current output from the full-wave rectifier circuit 32, the lower the voltage detected by the voltage detection circuit 31. Therefore, it is conceivable that the voltage detected when the current is output from the full-wave rectifier circuit 32 does not correspond to the voltage corresponding to the current consumption of another device 110.

Therefore, as described above, the estimation unit 30b of the present embodiment estimates the usage status of the other device 110 based on the voltage detected by the voltage detection circuit 31 when the current output from the full-wave rectifier circuit 32 is cut off. do. As a result, the amount consumed by the portable power supply device 1 does not affect the detection voltage of the voltage detection circuit 31, so that the usage status of the other device 110 can be estimated accurately.

The portable power supply device 1 includes a constant current constant voltage circuit 33. The constant current / constant voltage circuit 33 is connected to the storage battery 40 and the inverter circuit 50, is a charging circuit that supplies the current output from the full-wave rectifier circuit 32 to the storage battery 40, and is output from the full-wave rectifier circuit 32. It is also a circuit that supplies the current to the inverter circuit 50, which will be described later. The constant current / constant voltage circuit 33 is controlled by the control unit 30a of the microcomputer control circuit 30. The charging method of the storage battery 40 is not particularly limited, but a general constant current constant voltage charging method can be used. The type of the storage battery 40 is not particularly limited, and examples thereof include a lithium ion battery.

A storage battery current sensor 41 and a charging ON / OFF switch 42 are provided between the constant current / constant voltage circuit 33 and the storage battery 40. The storage battery current sensor 41 is a sensor that detects the current value supplied to the storage battery 40 from the constant current constant voltage circuit 33. The storage battery current sensor 41 is connected to the microcomputer control circuit 30, and the current value detected by the storage battery current sensor 41 is input to the charge / discharge status detection unit 30c of the microcomputer control circuit 30. The charge / discharge status detection unit 30c can determine whether or not the storage battery 40 is in the fully charged state based on the current value input from the storage battery current sensor 41 and the voltage value of the storage battery 40. For example, when the constant voltage value continues for a predetermined time or longer, it can be determined that the storage battery 40 is in the fully charged state. Further, the storage battery 40 is connected to the microcomputer control circuit 30, and the microcomputer control circuit 30 can detect the voltage of the storage battery 40. The microcomputer control circuit 30 can estimate the remaining amount of the storage battery 40 based on the voltage of the storage battery 40.

The charging ON / OFF switch 42 is provided between the storage battery current sensor 41 and the storage battery 40, and is controlled by the microcomputer control circuit 30. When the storage battery 40 is not in the fully charged state, the microcomputer control circuit 30 switches the charging ON / OFF switch 42 to the rechargeable state. As a result, current is supplied from the constant current / constant voltage circuit 33 to the storage battery 40. As will be described later, when discharging from the storage battery 40 is required, the microcomputer control circuit 30 switches the output (・ discharge) ON / OFF switch 52 to a dischargeable state. This makes it possible to discharge the storage battery 40. When the storage amount of the storage battery 40 is small, the output (discharge) ON / OFF switch 52 can be kept in a rechargeable state without being switched to the dischargeable state.

The portable power supply device 1 includes an inverter circuit 50. Although not shown, the inverter circuit 50 of the present embodiment is a single-phase inverter circuit having four switching elements and diodes, and is configured so that currents output from both the storage battery 40 and the full-wave rectifier circuit 32 can be input at the same time. .. That is, the output side of the constant current / constant voltage circuit 33 is connected to the input side of the inverter circuit 50 by a connection line 51, and the storage battery 40 is also connected to the connection line 51. An output (discharge) ON / OFF switch 52 is provided between the connection portion of the storage battery 40 in the connection line 51 and the input side of the inverter circuit 50. This output (discharge) ON / OFF switch 52 is controlled by the microcomputer control circuit 30. When the output (discharge) ON / OFF switch 52 is closed, the current can be supplied to the input side of the inverter circuit 50. When the output (discharge) ON / OFF switch 52 is opened, the current flowing from both the storage battery 40 and the full-wave rectifier circuit 32 to the input side of the inverter circuit 50 is cut off.

The inverter circuit 50 is connected to the control unit 30a of the microcomputer control circuit 30. The drive signal output from the control unit 30a is input to the inverter circuit 50. The inverter circuit 50 operates in response to a drive signal. The control unit 30a converts the current input to the inverter circuit 50 from both the storage battery 40 and the full-wave rectifier circuit 32 into an alternating current larger than the allowable current consumption of the commercial power supply 200 and outputs the current from the inverter circuit 50. As described above, the drive signal is output to the inverter circuit 50. For example, when the allowable current consumption of the commercial power supply 200 is 15A, the control unit 30a controls the inverter circuit 50 so that the currents of 30A to 40A are output from the inverter circuit 50. 30A to 40A is an example, the rated output current can be set in the above range, and the maximum output current can be set to about twice that range.

Further, the voltage output from the inverter circuit 50 can be changed by the output voltage adjustment volume 24. When the user operates the output voltage adjusting volume 24 to set the voltage, the control unit 30a generates a drive signal so as to be the voltage set by the output voltage adjusting volume 24 and outputs the drive signal to the inverter circuit 50. The voltage range that can be changed by the output voltage adjusting volume 24 can be, for example, a range of 100 to 125V, but is not limited to this.

An outlet 27 is connected to the output side of the inverter circuit 50. The outlet 27 may be provided with, for example, a 15A outlet and a 30A outlet. An inverter current sensor (inverter current detection unit) 53 is provided between the inverter circuit 50 and the outlet 27. The inverter current sensor 53 is a sensor that detects the current on the output side of the inverter circuit 50, and is connected to the microcomputer control circuit 30.

The inrush current suppression switch 21 is a switch that is turned on when it is desired to suppress the inrush current from flowing to the device 100 connected to the outlet 27, and turned off at other times, and is operated by the user according to the device 100. .. When the inrush current suppression switch 21 is turned on, the control unit 30a outputs the inverter circuit 50 to or less than the predetermined current value when the current value detected by the inverter current sensor 53 exceeds the predetermined current value. Control is performed to reduce the output voltage of the inverter circuit 50 so as to be, but the control method is not limited to this, and when the output current of the inverter circuit 50 is not flowing (when there is no load), a preset low voltage is used. There is also a method of outputting and gradually increasing the voltage when a current flows, and this method can also suppress the inrush current.

For example, when the device 100 connected to the outlet 27 is equipped with a commutator motor, an inrush current flows when the motor is started. This inrush current is generally a current that greatly exceeds the allowable current consumption of the commercial power supply 200. When the inrush current flows, the allowable current consumption of the commercial power supply 200 is limited to, for example, 15 A, so that the shortage is supplemented by the power output from the storage battery 40.

In the present embodiment, when an extremely large current value such as an inrush current at the time of starting the motor is detected, the output voltage of the inverter circuit 50 can be automatically lowered so as to be equal to or less than a predetermined current value. As a result, it is possible to suppress unnecessary consumption of the storage battery 40 and extend the usable time. The predetermined current value may be set to be less than the inrush current at the time of starting the motor of a general device 100 equipped with a commutator motor, and can be set to several times the rated output current, for example. Since the inrush current rises extremely steeply as compared with the normally flowing current, whether or not it is an inrush current can be determined by considering not only the current value but also the degree of change in the current value. If the inrush current suppression switch 21 is turned off, the output voltage of the inverter circuit 50 is not automatically reduced even if a large current such as an inrush current that rises sharply flows.

Further, for example, depending on the operation of the device 100 connected to the portable power supply device 1, it is conceivable that the storage battery 40 is frequently charged and discharged in a predetermined short period of time. If the storage battery 40 is frequently charged and discharged, the storage battery 40 may generate heat and become a temperature state unsuitable for charging and discharging. In the present embodiment, it can be determined whether or not the storage battery 40 is in a temperature state unsuitable for charging / discharging based on the charging / discharging state of the storage battery 40.

That is, the charge / discharge status detection unit 30c is a portion that detects the charge / discharge status of the storage battery 40 in a predetermined period. For example, the charge / discharge frequency of the storage battery 40 in a time (predetermined period) that goes back about 10 to 30 minutes from the present time can be acquired, and the charge / discharge frequency can be set as the charge / discharge status. The charge / discharge frequency can be calculated by acquiring the current direction switching frequency of the storage battery current sensor 41. Further, when detecting the charge / discharge status, the magnitude of the charge / discharge current, the charging time, and the discharging time can be taken into consideration. Further, the charge / discharge status detection unit 30c can also calculate the number of charge / discharge cycles of the storage battery 40 in a predetermined period based on the frequency of switching the current direction of the storage battery current sensor 41. When determining the temperature state of the storage battery 40, the atmospheric temperature can also be taken into consideration.

Since the temperature of the storage battery 40 and the frequency of charge / discharge are related, the charge / discharge status detection unit 30c may be composed of, for example, a sensor that detects the temperature state of the storage battery 40. By detecting the temperature state of the storage battery 40, it is possible to directly determine whether or not the storage battery 40 is in a temperature state unsuitable for charging and discharging.

The charge / discharge abnormality lamp 26 is turned on by the microcomputer control circuit 30 when it can be determined that the storage battery 40 is in a temperature state unsuitable for charging / discharging, and when it can be determined that the storage battery 40 is in a temperature state suitable for charging / discharging, the microcomputer is used. The light is turned off by the control circuit 30.

In the present embodiment, the maximum value of the input side current consumption of the full-wave rectifier circuit 32 can be changed. The maximum value of the input side current consumption of the full-wave rectifier circuit 32 may be changed automatically by the portable power supply device 1 or manually by the user, and one of them is set by the automatic / manual changeover switch 22 of the maximum current value. Can be selected. When the automatic / manual changeover switch 22 for the maximum current value is set to "automatic", the portable power supply device 1 automatically switches to the automatic change mode for changing the maximum value of the current consumption on the input side, while the automatic / manual changeover for the maximum current value. When the switch 22 is set to "manual", the user manually changes the maximum value of the input side current consumption in the manual change mode.

First, the automatic change mode will be described. In the automatic change mode, the control unit 30a changes the magnitude of the input-side current consumption of the full-wave rectifier circuit 32 according to the usage status of the other device 110 estimated by the estimation unit 30b. Specifically, the higher the voltage detected by the voltage detection circuit 31, the larger the magnitude of the output current from the constant current constant voltage circuit 33, while the lower the voltage detected by the voltage detection circuit 31. The lower the value, the lower the magnitude of the output current from the constant current constant voltage circuit 33. As an example, when the voltage of the commercial power supply 200 is 100V, if the voltage detected by the voltage detection circuit 31 is 100V, it can be estimated that there is almost no current consumption of the other device 110, so that it is full wave. The constant current constant voltage circuit 33 is controlled so that the current flowing on the input side of the rectifier circuit 32 is 15 A. If the voltage detected by the voltage detection circuit 31 is 98V, it can be estimated that the current consumption is flowing in the other device 110, so the constant current constant is set so that the current flowing on the input side of the full-wave rectifier circuit 32 is 12A. The voltage circuit 33 is controlled. In this way, the voltage detected by the voltage detection circuit 31 is divided into a plurality of stages, and the current value flowing to the input side of the full-wave rectifier circuit 32 is set in advance at each stage. This information can be stored in advance in a storage device (not shown) of the microcomputer control circuit 30.

Even if the maximum value of the current flowing on the input side of the full-wave rectifier circuit 32 is, for example, about 12A, the inverter circuit 50 can add the current input from the storage battery 40 to output, so that the output of the inverter circuit 50 is 30A, for example. The above current value can be secured.

Next, the manual change mode will be described. In the manual change mode, the current maximum value setting volume 23 is used. By operating the current maximum value setting volume 23 by the user, the magnitude of the output current from the constant current constant voltage circuit 33 can be changed. The user can grasp whether or not the other device 110 is connected, and if the other device 110 is connected, the current consumption of the other device 110. Assuming that the specification of the commercial power supply 200 is 15A, if the other device 110 is not connected, the current value flowing to the input side of the full-wave rectifier circuit 32 may be set to 15A, and the other device 110 may be used. When the current consumption of is 5 A, the current value flowing on the input side of the full-wave rectifier circuit 32 may be set to 10 A.

The input power supply abnormality lamp 25 is turned on by the microcomputer control circuit 30 when the voltage detected by the voltage detection circuit 31 is equal to or lower than a predetermined voltage, and is turned off in other cases. The predetermined voltage can be a voltage that cannot stabilize the output from the inverter circuit 50, and can be set to about 90V when the voltage of the commercial power supply 200 is 100V, for example.

(Flow chart of microcomputer control circuit)
Next, the flow of control will be described based on the flowchart of the microcomputer control circuit 30 shown in FIG. This flowchart starts when the power switch 20 is turned on and the power is turned on. Whether the power switch 20 is ON or OFF is determined by the microcomputer control circuit 30. When the power switch 20 is turned on, the process proceeds to step S1, the microcomputer control circuit 30 executes the initial setting corresponding to the start-up process, and sets various parameters related to the start-up operation.

When the initial setting is completed, the process proceeds to step S2, and the microcomputer control circuit 30 turns on the charge ON / OFF switch 42 and the output (discharge) ON / OFF switch 52. After turning on the charging ON / OFF switch 42 and the output (discharge) ON / OFF switch 52, the process proceeds to step S3, the control unit 30a outputs a drive signal to the inverter circuit 50, and a predetermined value of the inverter circuit 50 is determined. Perform output voltage control. At this time, the control unit 30a controls the inverter circuit 50 so that the output voltage reflects the set value of the output voltage adjustment volume 24.

After that, the process proceeds to step S4, and the microcomputer control circuit 30 determines whether or not the voltage (input voltage) input to the power supply connection unit 5 is 60 V or more. The determination in step S4 can be performed based on the voltage detected by the voltage detection circuit 31. The threshold value "60V" is an example, and for example, when the voltage of the commercial power supply 200 is 100V, it can be set in the range of 50% to 70%. The determination threshold value in step S4 can be called a first threshold value, and can be stored in advance in the microcomputer control circuit 30.

If NO is determined in step S4 and the input voltage is less than 60 V, the process proceeds to step S5. In step S5, the microcomputer control circuit 30 stops the control operation of the constant current constant voltage circuit 33. After that, the process proceeds to step S14. Step S14 will be described later.

On the other hand, if YES is determined in step S4 and the process proceeds to step S6, the microcomputer control circuit 30 determines whether or not the automatic / manual changeover switch 22 for the maximum current value is on the automatic side. When NO is determined in step S6 and the automatic / manual changeover switch 22 of the maximum current value is not on the automatic side, that is, in the manual mode in which the user changes the maximum value of the input side current consumption of the inverter circuit 50. The process proceeds to step S8, and the manual mode process is executed. In the manual mode processing, the microcomputer control circuit 30 reads the set value of the current maximum value setting volume 23, and changes the magnitude of the current flowing to the input side of the full-wave rectifier circuit 32 according to the set value. It controls the voltage circuit 33. Thereby, when the device 110 different from the portable power supply device 1 is connected to the commercial power supply 200, the current to the other device 110 can be secured. After passing through step S8, the process proceeds to step S14, which will be described later.

When YES is determined in step S6 and the automatic / manual changeover switch 22 of the maximum current value is on the automatic side, that is, in the automatic mode in which the maximum value of the input side current consumption of the full-wave rectifier circuit 32 is automatically changed. Proceeds to step S7. In step S7, the microcomputer control circuit 30 cuts off the output of the constant current constant voltage circuit 33 at predetermined time intervals, and confirms the voltage input to the power supply connection unit 5. The predetermined time can be set, for example, between several seconds and several tens of seconds. When the output of the constant current constant voltage circuit 33 is cut off, the current output from the full-wave rectifier circuit 32 is cut off. Since the microcomputer control circuit 30 temporarily stores the input voltage detected by the voltage detection circuit 31 in this cutoff state, the amount consumed by the portable power supply device 1 does not affect the detection voltage of the voltage detection circuit 31. .. Since the time during which the output of the constant current / constant voltage circuit 33 is cut off is set to be extremely short, it has almost no effect on the device 100. While the output of the constant current / constant voltage circuit 33 is cut off, the current to the inverter circuit 50 can be supplemented by the current from the storage battery 40.

After passing through the process of step S7, the process proceeds to step S9. In step S9, the microcomputer control circuit 30 determines whether or not the input voltage temporarily stored in step S7 is 90 V or more. The determination threshold value “90V” in step S9 is an example, and for example, when the voltage of the commercial power supply 200 is 100V, it can be set in the range of 85% to 90%. The determination threshold value in step S9 can be called a second threshold value, and the second threshold value is a value larger than the first threshold value in step S4, but is lower than the voltage of the commercial power supply 200. The second threshold value can also be stored in advance in the microcomputer control circuit 30.

If NO is determined in step S9 and the input voltage is less than 90V, the voltage of the commercial power supply 200 is abnormally low, so the process proceeds to step S10, and the microcomputer control circuit 30 turns on the input power supply abnormality lamp 25. After step S10, the process proceeds to step S11, and the microcomputer control circuit 30 turns off the charge ON / OFF switch 42 and the output (discharge) ON / OFF switch 52. After that, the process proceeds to step S12, the control unit 30a stops the control operation of the inverter circuit 50 and the constant current constant voltage circuit 33, and this flow stops. If the power switch 20 is turned off and then turned on again, the process is repeated from the start.

If YES is determined in step S9 and the input voltage is 90 V or more, there is no abnormality in the voltage of the commercial power supply 200, and the process proceeds to step S13. In step S13, automatic mode processing is executed. In the automatic mode processing, first, the maximum value of the current consumption according to the input voltage confirmed in step S7 is automatically set. Then, the control unit 30a controls the output of the constant current constant voltage circuit 33 so that the value becomes equal to or less than the set maximum value. Thereby, when the device 110 different from the portable power supply device 1 is connected to the commercial power supply 200, the current to the device 110 can be secured. This automatic mode processing can be executed based on the usage status of the other device 110 estimated by the estimation unit 30b described above.

In step S14, the microcomputer control circuit 30 confirms the current value at the time of charging / discharging by the storage battery current sensor 41. After that, the process proceeds to step S15, and it is determined whether or not the charge / discharge cycle of the storage battery 40 is a predetermined number of times or less at a predetermined charge / discharge current value or more as a charge / discharge state in a predetermined period. The charge / discharge current value is also added to the determination condition in step S14 because the temperature state of the storage battery 40 largely depends on the charge / discharge current value. For example, if the charge / discharge current value is low, it is unlikely that the temperature state of the storage battery 40 is high even if the charge / discharge cycle exceeds a predetermined number of times. Even if it exceeds the limit, it can be estimated that the storage battery 40 is in a state where it can be charged and discharged. On the other hand, if the charge / discharge current value is equal to or higher than a predetermined value, the temperature of the storage battery 40 rises to some extent even if the charge / discharge cycle is one cycle, and if such charge / discharge cycles exceed a predetermined number of times within a predetermined period, It can be estimated that the temperature state of the storage battery 40 is not suitable for charging / discharging.

If NO is determined in step S15 and the charge / discharge current value of the storage battery 40 exceeds a predetermined number and the charge / discharge cycle exceeds a predetermined number of times, it is highly possible that the temperature state of the storage battery 40 is not suitable for charge / discharge. .. In step S15 of FIG. 2, only the charge / discharge cycle is described as a determination condition, but this is done due to the space in the drawing. In reality, as described above, only the charge / discharge cycle is described. However, the charge / discharge current value is also added to the judgment condition.

If NO is determined in step S15, the process proceeds to step S16, and the microcomputer control circuit 30 turns on the charge / discharge abnormality lamp 26. After that, the process proceeds to steps S11 and S12 described above, and the microcomputer control circuit 30 stops the control operation of the inverter circuit 50 and the constant current constant voltage circuit 33. That is, when the control unit 30a determines that the charge / discharge status of the storage battery 40 detected by the charge / discharge status detection unit 30c is equal to or higher than the predetermined charge / discharge current value and exceeds the predetermined charge / discharge frequency, the control unit 30a determines. Charging by the constant current / constant voltage circuit 33 can be prohibited, and the output of the current from the inverter circuit 50 can be prohibited to prohibit the discharge of the storage battery 40.

If YES is determined in step S15 and the charge / discharge current value of the storage battery 40 is less than a predetermined value or the charge / discharge cycle is a predetermined number of times or less, the temperature state of the storage battery 40 may be a temperature state suitable for charge / discharge. expensive. In this case, the process proceeds to step S17 to determine whether or not the inrush current suppression switch 21 is ON. If NO is determined in step S17 and the inrush current suppression switch 21 is turned off, the process returns to step S4. If YES is determined in step S17 and the inrush current suppression switch 21 is ON, the process proceeds to step S18. In step S18, the microcomputer control circuit 30 continuously confirms the output value of the inverter current sensor 53. By continuously checking the output value of the inverter current sensor 53, it is possible to check the rising state of the load current.

After that, the process proceeds to step S19, and when the rise of the output value of the inverter current sensor 53 is steep and the value is significantly higher than the current normally flowing, the microcomputer control circuit 30 determines that the inrush current has flowed. The output voltage of the inverter circuit 50 is lowered so that the output side of the inverter circuit 50 becomes equal to or less than a predetermined current value. If it is not determined that the inrush current has flowed, the microcomputer control circuit 30 controls the predetermined output voltage. After that, the process returns to step S4. When the power switch 20 is turned off, this flow is interrupted.

The portable power supply device 1 can be used as a general charge / discharge power supply device without being connected to the commercial power supply 200. In this case, only the current discharged by the storage battery 40 is output from the inverter circuit 50.

(Action and effect of the embodiment)
As described above, according to this embodiment, the current input from the commercial power supply 200 is converted into direct current by the full-wave rectifier circuit 32, and then supplied to the storage battery 40 via the constant current constant voltage circuit 33. , The storage battery 40 can be charged. Since the DC current converted to DC by the full-wave rectifying circuit 32 and the DC current discharged from the storage battery 40 are simultaneously input to the inverter circuit 50, the inverter circuit 50 uses the input DC current as the commercial power supply 200. It can be converted to an alternating current larger than the allowable current consumption and output. This makes it possible to simultaneously use a device having a current consumption exceeding, for example, 15 A, or a plurality of devices having a total current consumption exceeding 15 A, without performing additional work for power supply wiring and installation of a high-capacity overcurrent circuit breaker.

Further, when the device 110 different from the portable power supply device 1 is connected to the commercial power supply 200, the maximum value of the current consumed by the portable power supply device 1 is set to a value in consideration of the current consumption of the other device 110. Therefore, it is not necessary to affect the operation of another device 110. This maximum value can be set by a user who has grasped the current consumption of another device 110, or can be automatically determined and set by the portable power supply device 1.

Further, since the temperature state of the storage battery 40 can be estimated based on the charge / discharge current value and the charge / discharge frequency of the storage battery 40 and the estimation result can be reflected in the charge / discharge control of the storage battery 40, abnormal overheating of the storage battery 40 can be prevented. At the same time, the life of the storage battery 40 can be extended.

Further, since the inrush current to the device 100 can be suppressed by the portable power supply device 1, the storage battery 40 can be prevented from being wasted.

The above embodiments are merely exemplary in all respects and should not be construed in a limited way. Further, all modifications and modifications belonging to the equivalent scope of the claims are within the scope of the present invention.

As described above, the portable power supply device according to the present invention can be used, for example, at various construction work sites, civil engineering work sites, factories, various work sites, and the like.

1 Portable power supply 5 Power supply connection 23 Current maximum value setting volume 31 Voltage detection circuit 32 Full-wave rectifier circuit 33 Constant current constant voltage circuit (charging circuit)
30a Control unit 30b Estimating unit 30c Charge / discharge status detection unit 40 Storage battery 50 Inverter circuit 53 Inverter current sensor (inverter current detection unit)
100 Equipment 110 Another equipment 200 Commercial power supply (AC power supply)
201 outlet

Claims (8)

In a portable power supply with a storage battery
The power connection part connected to the AC power supply and
A rectifier circuit that converts the current input from the power supply connection to direct current,
A charging circuit that supplies the current output from the rectifier circuit to the storage battery,
An inverter circuit that can simultaneously input the current output from both the storage battery and the rectifier circuit,
The inverter circuit is controlled so that the current input to the inverter circuit from both the storage battery and the rectifying circuit is converted into an AC current larger than the allowable current consumption of the AC power supply and output from the inverter circuit. A portable power supply that is characterized by having a control unit. In the portable power supply device according to claim 1,
A portable power supply device characterized in that the maximum value of the input side current consumption of the rectifier circuit can be changed. In the portable power supply device according to claim 2,
It is equipped with an estimation unit that estimates the usage status of other devices connected to the AC power supply.
The control unit is a portable power supply device characterized in that the control unit is configured to change the magnitude of the input-side current consumption of the rectifier circuit according to the usage status of other devices estimated by the estimation unit. .. In the portable power supply device according to claim 3,
A voltage detection circuit for detecting the voltage input to the power supply connection portion is provided.
The estimation unit is a portable power supply device configured to estimate the usage status of other devices based on the voltage detected by the voltage detection circuit. In the portable power supply device according to claim 4,
The estimation unit is portable, characterized in that it is configured to estimate the usage status of other devices based on the voltage detected by the voltage detection circuit when the current output from the rectifier circuit is cut off. Power supply. In the portable power supply device according to claim 2,
A portable power supply device including a maximum value setting volume for setting the maximum value of the input side current consumption of the inverter circuit. In the portable power supply device according to any one of claims 1 to 6.
A charge / discharge status detection unit for detecting the charge / discharge status of the storage battery during a predetermined period is provided.
When the control unit determines that the charge / discharge status of the storage battery detected by the charge / discharge status detection unit is equal to or higher than a predetermined charge / discharge current value and exceeds a predetermined charge / discharge frequency, the control unit charges the battery. A portable power supply device characterized in that charging by a circuit is prohibited or current output from the inverter circuit is prohibited. In the portable power supply device according to any one of claims 1 to 7.
It is provided with an inverter current detector that detects the current on the output side of the inverter circuit.
When the current value detected by the inverter current detection unit exceeds a predetermined current value, the control unit lowers the output voltage of the inverter circuit so that the output of the inverter circuit becomes equal to or less than the predetermined current value. A portable power supply that features an inverter.

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