JP2014117083A - Input power supply switching method for power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device in which a fault rate can be decreased and cost can be reduced by reducing mechanisms and components, with respect to a power storage device having equal functionality, the power storage device being configured to automatically switch to power supply from a storage battery when power supply from the outside is lost.SOLUTION: As a power source of a management mechanism for managing a state of a storage battery, a normal voltage from a storage battery side and an activation voltage, below the normal voltage, from a power supply input section are included. Supply of power to the power supply input section is recovered from the state where power cannot be supplied by the power supply input section and discharging of the storage battery, operation of the management mechanism and charging of the storage battery are initiated by activation power supply, and the normal voltage is supplied.

Description

The present invention provides an input power supply for a power storage device having a function of supplying an external power supply to a load connected to the power storage device when there is external input power and switching to a supply from a storage battery when the external power supply is lost It relates to the switching method.

In the power storage device, power is continuously supplied to the load of the power output unit by automatically switching from the power input unit when there is an external input power source and from the storage battery when there is no external power source.

Usually, the mechanism that manages the storage battery operates using an external power supply, but it is necessary to continue to manage the storage battery even if the external power supply is lost due to a power failure, etc., so switch to the power supply from the storage battery using a switching circuit, etc. Has achieved continuous operation. (See Patent Document 1)

For power storage devices that do not have an automatic switching function, turn off the load used by the commercial power supply, and after the user connects to the output terminal of the power storage device, turn on the load and turn it back on. There is also a simple one that turns off the load power and manually connects the power storage device to the commercial power source when switching.

A battery that can be charged and discharged repeatedly is used for the battery built in such a power storage device, but it operates with a storage battery so that it does not fall below the end-of-discharge voltage in order to prevent deterioration of the battery due to overdischarge. It is necessary to have a mechanism that separates from the power consuming device such as a management mechanism to be connected and an externally connected load.

JP 2008-226673 A

The power storage device having the automatic switching function is continuously used by switching the power source of the storage battery management mechanism and switching the power source to the load, and a relay is used for the switching. Although a momentary power failure occurs during the switching operation, a relay with a short power failure time that does not affect the management device or load is used.

Since it is used in places where frequent power outages occur and relays are frequently switched, relays may need to be replaced in order to prevent problems due to contact deterioration in advance. It is necessary to replace multiple locations.

Even if the supply of external power is stopped, it switches to supply by storage battery.When the storage battery voltage reaches the end-of-discharge voltage, it is disconnected from the management mechanism and load to prevent deterioration of the storage battery, and when the external power supply is restored, It is an object of the present invention to provide a power storage device in which operation of a management mechanism and power supply to a load start.

As an operation power source of a management mechanism for managing the state of the storage battery, when the storage battery is equal to or higher than the discharge end voltage, a normal voltage from the storage battery side is always supplied, and a starting voltage lower than the normal voltage is supplied from the power input unit.

When the supply from the power input unit resumes in the state where there is no power supply from the power input unit and the storage battery to the management mechanism, the management mechanism is activated by the start voltage, and the voltage of the storage battery becomes the discharge end voltage by the start of charging. When the value exceeds, the operation of the management mechanism with normal voltage starts.

In a power storage device provided with a plurality of power input units, the first power input unit is constantly supplied with stable power such as a commercial power supply, and the second power input unit is repeatedly stopped and restarted, such as a solar panel and wind power generation. When electric power is connected, the first power input unit continues to charge the storage battery while switching when the second power input unit is stopped and when the second power input unit is capable of output.

Since the voltage / current changes due to environmental changes, the second power input unit is connected to the second power input unit after being made constant via the charge controller.

When the load is operated with the power of the storage battery and the voltage drops to near the discharge end voltage, the load output can be stopped by warning that the power of the power output section stops to prevent deterioration of the storage battery by a remaining amount indicator or buzzer sound. It becomes possible to stop safely.

The present invention eliminates the need for a power supply switching mechanism that operates a management mechanism according to the presence or absence of an input power supply, reduces the failure rate due to simplification of the mechanism, and replaces it during maintenance for a power storage device having an equivalent function. A power storage device capable of reducing the number of parts can be realized.

When a plurality of types of external power sources are connected, it is possible to automatically switch to a power source that can output, so that efficient storage battery charging is possible.

It is a figure which shows the outline of this invention. It is the figure which showed an example for implementing this invention. It is a figure showing the operating state of the management mechanism.

As an example, a description will be given based on a power storage device having a function of switching between two types of power sources, a commercial power source and a solar panel, and a function of switching to power of a storage battery when the external power source is lost.

An explanation will be given based on FIG. 2 showing an outline of the principle of the present invention. The commercial power source input unit 10 is connected to AC 100 V of the commercial power source 1, the solar panel power source input unit 21 is connected to the voltage of the solar panel 2, and the charge controller 20 is converted to the charging voltage of the storage battery 3, and the power source The output unit 40 is connected to a load 4 that is operated by a commercial power supply AC 100V.

The management mechanism 5, the charging device 12, the DC12V storage battery 3 and the like are housed in the case, and the power input units 10 and 21, the power output unit 40, the remaining amount indicator 50 and the like can be easily operated and confirmed. It is installed outside.

The management mechanism 5 operates with a normal voltage of DC5V obtained by transforming the storage battery voltage and a startup voltage of DC4.6 to 4.7V obtained by converting the outputs of the commercial power source 1 and the solar panel 2, and the normal voltage and the startup voltage are Whenever output is possible, power is supplied to the management device 5.

When both the normal voltage and the starting voltage are supplied simultaneously, it operates with the normal voltage due to the voltage difference, and it can be considered that the starting voltage is not consumed. Therefore, a switch or the like for stopping the starting voltage is not provided. A diode or the like is inserted on the start-up voltage side to prevent a normal voltage backflow.

The voltage of the storage battery is converted to AC 100 V by the DC-AC converter 11 and then sent to the power output unit 40.

When the commercial power source 1 and the solar panel 2 are connected, the power from the solar panel 2 is used when the solar panel 2 can be supplied with power. Moreover, when there is no output from the solar panel 2, the commercial power source 1 is used and the storage battery 3 is charged.

When the commercial power source 1 is available, the commercial power source input unit 10 and the power source output unit 40 are directly connected by the output switching relay 41 regardless of the state of the storage battery 3, and the load 4 is operated by the commercial power source 1. Meanwhile, if the storage battery 3 is being charged or has been charged, it enters a standby state (S1 in FIG. 3).

For the judgment of the output switching, the solar panel monitoring unit 23 monitors the voltage of the solar panel 2, and when it exceeds the set voltage, it switches to the circuit on the solar panel side, and when it falls, it switches to the commercial power source 1. .

If the commercial power source 1 is lost due to a power failure when the commercial power source 1 is available and the storage battery 3 is being charged or fully charged, and the load 4 is used, the output switching relay 41 and the DC-AC converter 11 The power output unit 40 is connected, and the load 4 continues to operate with the power of the storage battery 3. (S2 in FIG. 3)

When the power failure is not restored, the operation of the storage battery 3 continues for a long time, and the storage battery monitoring unit 31 detects that the storage battery voltage has approached the end-of-discharge voltage, a warning is given by the remaining amount indicator 50 and the buzzer 51, The user is warned that the output of the output unit 40 is stopped.

After that, if the battery continues to be used and falls below the end-of-discharge voltage, the storage battery 3 is disconnected from the load 4 and the management mechanism 5 by the storage battery release relay 30 to prevent the storage battery 3 from being deteriorated due to overdischarge. Stops. (S3 in FIG. 3)

This disconnection is performed by a storage battery open relay 30 attached to the output side of the storage battery 3, and the relay operates to open the storage battery 3 when it falls below the discharge end voltage set in the management mechanism 5 in advance.

When the commercial power source 1 recovers from a power failure while the storage battery 3 is opened, the management mechanism 5 starts to operate by the startup voltage (S4 in FIG. 3), and the output switching relay 41 includes the commercial power source input unit 10 and the power source output unit. 40 is connected. At the same time, when the voltage of the storage battery 3 exceeds the end-of-discharge voltage due to the start of charging of the storage battery 3, the supply of the normal voltage resumes and the normal operation before the power failure returns. (S5 in FIG. 3)

Moreover, when it recovers from a power failure before it falls below the discharge end voltage of the storage battery 3 (S2 in FIG. 3), the output switching relay 41 is switched, and at the same time the commercial power input unit 10 and the power output unit 40 are connected. The charging of the storage battery 3 can be resumed, and the normal operation before the power failure can be restored without interrupting the power supply to the load 4. (S5 in FIG. 3)

If the terminals of the power output unit 40 are not only commercial AC 100V but also terminals such as DC 12V of cigar socket and DC 5V for charging USB devices, the convenience of the power storage device is improved.
As described above, the description has been given based on the embodiment, but is not limited to the above-described embodiment.

1 First power supply (commercial power supply)
10 First power input section (commercial power input section)
11 Inverter (AC-DC)
12 charging device 13 charge switching means (charge switching relay)
2 Second power supply (solar panel)
20 charge controller 21 2nd power input part (solar panel power input part)
22 Transformer (regulator)
23 Second power source monitoring means (solar panel power source monitoring unit)
3 storage battery 30 storage battery release means (storage battery release relay)
31 Storage battery monitoring means (storage battery monitoring unit)
32 Converter (DC-AC)
33 Transformer (regulator)
4 Load (operated by commercial power supply)
40 power output unit 41 output switching means (output switching relay)
5 Management mechanism 50 Remaining capacity indicator 51 Buzzer

Claims (4)

A first power input unit for taking in a first power source such as a commercial power source;
A second power input unit for capturing a second power different from the first power;
Rechargeable storage battery,
A power output with one or more terminals for connecting the load,
A charging device that operates from the first power source for charging the storage battery;
A management mechanism for controlling the storage battery and controlling the operation of the structural mechanism necessary for the operation of the power storage device;
Second power supply monitoring means for monitoring the voltage of the second power supply;
Charge switching means for switching whether the storage battery is charged by the charging device or the second power source;
Storage battery opening means for separating the storage battery from the load and the management mechanism;
Output switching means for switching to the first power source or the power on the storage battery side with respect to the load;
Is provided,
The management mechanism operates by supplying a normal voltage from the storage battery side and a start-up voltage lower than the normal voltage from the first power source or the second power source, and supplying power to the first power source and the second power source. In the state where the storage battery is opened by the storage battery opening means and the management mechanism is stopped, the power supply of the first power supply or the second power supply is resumed, and the operation of the management mechanism is performed by the start voltage. When started, the storage battery opening means is closed to start charging of the storage battery, and normal operation of the management mechanism using the normal voltage starts. The storage battery opening means monitors the voltage of the storage battery by a storage battery monitoring means, and the storage battery opening means opens the storage battery when it falls below a discharge end voltage of the storage battery. An input power source switching method for a power storage device. The first power source is a power source for charging the storage battery and a load operation, the second power source is a power source for charging the storage battery, and when the first power source and the second power source are outputting, The first power source operates a load, charges the storage battery with the second power source, and when there is no output of the second power source, the charge switching means switches to the first power source, and the first power source The method of switching an input power source of a power storage device according to claim 1, wherein the operation of the load and the storage battery are charged. The charge switching means is configured to charge the storage battery by the second power supply when the first power supply charges the storage battery when the second power supply monitoring means falls below a voltage necessary for charging the storage battery. The input power source switching method for the power storage device according to claim 1, wherein the input power source switching method is performed.

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