JP2016134947A - Power supply unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply unit using a secondary battery capable of detecting a connection made across an input terminal to which an input electric power is supplied and an output terminal from which an output electric power is output for supplying to an outside load.SOLUTION: The power supply unit includes: an input converter that converts an input electric power which is input from an outside power source into a DC power to be charged in a secondary battery; an output converter that converts the DC power from the secondary battery into an output electric power to be supplied to the outside load; and detection means for detecting a connection made across an output terminal to which an output electric power supplied to an outside load and an input terminal to which an input electric power is supplied.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply device capable of storing power using a secondary battery, and relates to a power supply device for a power storage system that charges external input power to a secondary battery, discharges the power charged in the secondary battery, and supplies the power to an external load. It is about.

  In recent years, a power storage system including a power supply device using a secondary battery is known. This power storage system is used for storing power in a power supply device to use nighttime power in the daytime, saving power through cooperation with a solar power generation facility, or securing power during a power failure.

  By the way, when the secondary battery provided in the power supply device is discarded, it is necessary to discharge the secondary battery to improve safety.

  As a power supply device that discharges the secondary battery at the time of disposal, a discharging resistor and a switch are provided, and the secondary battery is connected to the discharging resistor by switching the switch at the time of disposal to forcibly discharge the secondary battery. It has been known.

  For example, Patent Documents 1 and 2 are known as prior art document information related to the invention of this application.

JP 2010-182579 A JP-A-8-227730

  In the power supply device, when shifting to the disposal mode in which the secondary battery is forcibly discharged at the time of disposal, the state in which this disposal mode is executed is not the normal use state of the power supply device. It is preferable to use a special state that deviates from the state.

  By the way, a power supply device using a commercial AC power source includes a socket to which a power plug connected to the commercial AC power source and a power plug of an external electric device serving as a load are connected. In the power supply device, the state in which the power plug is connected to the socket is a special state in addition to being easy. Further, in a power supply device including a power input terminal and a power output terminal having a different form from the power plug, the power input terminal and the power output terminal may be connected to each other even when the power plug and the socket are connected. It can be easily done as well as a special state.

  On the other hand, a power supply device including a power supply plug connected to a commercial AC power supply and a socket connected to a power supply plug of an external electric device serving as a load may erroneously connect the power supply plug to the socket.

  Similarly, when the power input terminal and the power output terminal can be connected like the power plug and socket described above, the power input terminal and the power output terminal may be erroneously connected.

  In view of such circumstances, an object of the present invention is to provide a power supply device capable of detecting that its own power input terminal and power output terminal are connected.

  In order to achieve the above object, the present invention has detection means for detecting that a power supply output terminal from which output power supplied to an external load is derived and a power supply input terminal for supplying input power are connected.

  As described above, according to the present invention, it is detected that the power supply input terminal and the power supply output terminal of the power supply device itself are connected to each other. By setting the mode, the power input terminal and power output terminal of the power supply itself can be connected to each other, which can be set to the discard mode by a special connection state that is not possible during normal use of the power supply. Transition to the mode can be done with easy-to-understand operation without mistakes.

  In addition, since it is detected that the power supply input terminal and the power supply output terminal of the power supply device itself are connected to each other, by notifying the detection, it is noticed that the power supply input terminal and the power supply output terminal are connected to each other by mistake. Can be made.

  In addition, when the detection unit detects that the power input terminal and the power output terminal are connected to each other, and is set to the discard mode in which the secondary battery is discharged, when the discard mode is set, Since the input end of the power supply unit and the output end of the power supply unit are connected, the discharge path is connected to the input converter connected to the input end side of the power supply unit and the output converter connected to the output end side of the power supply unit Is formed. Therefore, the internal circuit of the power supply device of the input converter and the output converter becomes a load of the secondary battery, and an advantageous effect that the secondary battery can be discharged using the input converter and the output converter is obtained.

The circuit block diagram which shows the power supply device of the 1st Example by embodiment of this invention. The circuit block diagram which shows the power supply device of the 2nd Example by embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
(Embodiment)
FIG. 1 is a circuit block diagram showing a power supply device of a first example according to the embodiment of the present invention.

  In the figure, a power supply device 1 is housed in a housing 2 and includes a power plug 3 connected to a commercial AC power source serving as an external power source and a socket 4 connected to a power plug of an external electrical device serving as an external load. . The power plug 3 is connected to the input terminal 1 </ b> A of the power supply device 1, and the socket 4 is connected to the output terminal 1 </ b> B of the power supply device 1.

The power supply device 1 includes an AC / DC converter 5, a DC / DC converter 6, a charge / discharge circuit 7, a secondary battery 8, a DC / AC converter 9, a switching circuit 10 and a control circuit 11 in a housing 2. The AC / DC converter 5 converts AC power supplied to the power plug 3 into DC power. The DC / DC converter 6 converts the DC power output from the AC / DC converter 5 into DC power for charging the secondary battery 8. In the present embodiment, the AC / DC converter 5 and the DC / DC converter 6 correspond to input converters, but are not limited thereto. The input converter may include at least an AC / DC converter.

  The charging / discharging circuit 7 selectively charges and discharges the secondary battery 8. The secondary battery 8 charges direct current power output from the DC / DC converter 6. The DC / AC converter 9 is a so-called inverter that converts DC power output from the secondary battery 8 into AC power. The DC / AC converter 9 corresponds to an output converter that converts DC power of the secondary battery 8 into output power supplied to an external load connected to the socket 4. The switching circuit 10 has a first switch 10A and a second switch 10B, and selectively supplies the AC power output from the DC / AC converter 9 to the power plug 3 by selectively opening and closing the first switch 10A and the second switch 10B. The AC power is switched to be supplied to the socket 4. The control circuit 11 monitors the voltage, current, and temperature of the secondary battery 8 and controls the AC / DC converter 5, the DC / DC converter 6, the charge / discharge circuit 7, and the DC / AC converter 9 to charge / charge the secondary battery 8. This is a so-called battery management unit that controls discharge.

  The control circuit 11 controls the switching of the power system used by controlling the opening and closing of the first switch 10A and the second switch 10B of the switching circuit 10.

  The control circuit 11 detects a power failure state when the input power is not supplied from the external power source, and detects a power recovery state when the supply of input power from the external power source is resumed. Then, the control circuit 11 closes the first switch 10A to form a path for connecting the output end of the DC / AC converter 9 to the socket 4, closes the second switch 10B, and receives the AC power supplied to the power plug 3. A path to be supplied to the socket 4 is formed.

  The secondary battery 8 is constituted by an assembled battery in which a plurality of secondary battery cells such as lithium ion, lithium polymer, nickel hydride and the like are connected in series. The control circuit 11 has a battery management function for managing the secondary battery 8 by individually monitoring the voltage, current and temperature of each battery cell constituting the secondary battery 8. The control circuit 11 uses, as a power supply, DC power obtained by further converting DC power output from the DC / DC converter 6 by the DC / DC converter 13.

  In addition, the control circuit 11 is controlled by the charge / discharge circuit 7 and the switching circuit 10 to output at least commercial AC power, a commercial power output mode, a self-discharge output mode that uses power stored in the secondary battery 8, and a secondary battery. Control is performed to set 8 to a discard mode for forcibly discharging.

  Further, the power supply device 1 has a display 14 and an operation panel 15 in the housing 2. The display 14 displays the operating state and operating mode of the power supply device 1 or the amount of power stored in the secondary battery 8. The operation panel 15 is operated when manually inputting the operation mode.

  The power supply device 1 also includes a heat dissipation fan 16 installed in the housing 2 and a drive circuit 18 that drives a fan motor 17 that rotates the heat dissipation fan 16. The heat dissipation fan 16 releases heat inside the housing 2 to the outside by being rotated.

  In the above configuration, in a state where the power plug 3 is connected to the commercial AC power supply and the AC power is supplied to the input terminal 1A, the control circuit 11 is set to the commercial power output mode, and the switching circuit 10 is connected to the input terminal 10B. Switch to select the supplied AC power. Therefore, in the commercial power output mode, the AC power supplied to the input terminal 1A via the power plug 3 is derived from the output terminal 1B, and the AC power is connected to an external electric device (not shown) connected to the socket 4. Supplied as a power source.

On the other hand, charging / discharging of the secondary battery 8 is performed by controlling the charging / discharging circuit 7 by the control circuit 11 according to the charging capacity of the secondary battery 8, for example, based on the terminal voltage of the secondary battery 8. The secondary battery 8 is charged with the DC power converted by the AC / DC converter 5 and the DC / DC converter 6. Further, the secondary battery 8 is discharged by the power supplied to the DC / AC converter 9. In a state in which commercial AC power is supplied to the input terminal 1A, the secondary battery 8 is charged until it is fully charged, and maintains a fully charged state.

  When AC power is no longer supplied to the input terminal 1A due to a power failure of the commercial AC power supply or the like, the control circuit 11 detects a power failure state and shifts to the self-discharge output mode. In the self-discharge output mode, the control circuit 11 operates the DC / AC converter 9 and switches the switching circuit 10 to derive the output of the DC / AC converter 9 from the output terminal 1B. Therefore, the DC power charged in the secondary battery 8 is discharged, and AC power obtained by converting the DC power by the DC / AC converter 9 is supplied as a power source for an external electric device (not shown) connected to the socket 4. Become so.

  The setting of the self-discharge output mode can be performed by manual operation using the operation panel 15.

  In the self-discharge output mode, when the supply of AC power to the input terminal 1A is started by the recovery of the commercial AC power supply, the control circuit 11 detects the power recovery state and shifts to the commercial power supply output mode. For this reason, the switching circuit 10 is switched so as to derive the AC power supplied to the input terminal 1A from the output terminal 1B, and the AC power derived from the output terminal 1B is connected to the socket 4 (not shown). ).

  Next, the operation in a state where the power plug 3 is connected to the socket 4 will be described.

  When the power plug 3 is disconnected from the commercial AC power supply, AC power is not supplied to the input terminal 1A, and the control circuit 11 detects a power failure state and shifts to the self-discharge output mode. Therefore, the DC / AC converter 9 operates and the switching circuit 10 is switched, and the AC power from the DC / AC converter 9 is derived from the output terminal 1B. When the power plug 3 is connected to the socket 4, AC power derived from the output terminal 1 </ b> B is supplied to the input terminal 1 </ b> A via the socket 4 and the power plug 3. As a result, the control circuit 11 detects the power recovery state and shifts to the commercial power output mode.

  Therefore, when the power plug 3 is connected to the socket 4, the self-discharge output mode and the commercial power output mode are repeated, and the power supply device 1 generates a hunting phenomenon.

  The detection unit 12 detects that this hunting phenomenon has been repeated a predetermined number of times within a predetermined time, and detects that the power plug 3 is connected to the socket 4.

  In this embodiment, after this hunting phenomenon is detected, the control circuit 11 further drives the DC / AC converter 9 intermittently, which is different from normal driving, and the detection unit 12 receives the input signal supplied to the input terminal 1A. By intermittent driving, it is detected that it is intermittently synchronized with the AC signal generated from the DC / AC converter 9. The detection unit 12 detects that the input signal supplied to the input terminal 1A is synchronized with the AC signal generated by intermittently driving the DC / AC converter 9. Thereby, the detection unit 12 confirms that the power plug 3 is connected to the socket 4.

  When the connection between the power plug 3 and the socket 4 is detected by the detection unit 12, a display for notifying the connection is performed by the display 14. In the present embodiment, a warning sound for notifying the connection between the power plug 3 and the socket 4 is also generated by the sounding body 19 such as a buzzer.

  Next, the discard mode will be described.

  The discard mode is set when the secondary battery 8 is forcibly discharged when the secondary battery 8 is discarded. According to the present embodiment, the detection unit 12 included in the control circuit 11 detects that the power plug 3 is connected to the socket 4, and is set to the discard mode via the detection.

  When the detection unit 12 detects the connection between the power plug 3 and the socket 4, the secondary battery 8 enters a disposal mode execution ready state for forced discharge. The display 14 displays a message for notifying the connection between the power plug 3 and the socket 4 and displays a screen for selecting whether to confirm the execution of the discard mode for executing the forced discharge of the secondary battery 8. .

  When the display device 14 is in this display state, when the operation panel 15 is operated to confirm the execution of the discard mode, the power supply device 1 enters the discard mode execution state. In the execution state of the discard mode of the power supply device 1, the control circuit 11 switches the switching circuit 10 so as to derive the output of the DC / AC converter 9 from the output terminal 1B. Therefore, the AC / DC converter 5, the DC / DC converter 6, and the power supply device 1 in which the output terminal 1 </ b> B and the input terminal 1 </ b> A of the power supply device 1 are connected to the input end side of the power supply device 1 through the socket 4 and the power plug 3. A discharge path of the DC / AC converter 9 connected to the output end side of the DC / AC converter 9 is formed.

  Further, in the execution state of the power supply apparatus 1 in the discard mode, the control circuit 11 continuously operates the DC / AC converter 9 and operates the AC / DC converter 5 and the DC / DC converter 6. Therefore, the AC / DC converter 5, the DC / DC converter 6, and the DC / AC converter 9 serve as a load for the secondary battery 8, and the discharge of the secondary battery 8 is performed by the AC / DC converter 5, the DC / DC converter 6, and the DC / AC. This is done using the converter 9.

  Moreover, in the execution state of the discard mode of the power supply device 1, the control circuit 11 drives the drive circuit 18 to rotate the fan 16 so as to forcibly drive the fan motor 17 regardless of the temperature.

  As described above, in the execution state of the discard mode of the power supply device 1, the internal circuit of the power supply device 1 is operated and used as a load of the secondary battery 8. That is, forcible discharge at the time of disposal of the secondary battery 8 can be performed using the internal circuit of the power supply device 1. When this discard mode is executed, the internal circuit of the power supply device 1 that can be used as a load of the secondary battery 8 is used as much as possible, so the discharge time of the secondary battery 8 is shortened. It is advantageous to do.

  Therefore, in the case of the present embodiment, the power supply device 1 informs of a special connection state that is not used during normal use of the power supply device 1 such that the power supply plug 3 and the socket 4 that the power supply device 1 has are connected to each other. To the discard mode. Therefore, when the power plug 3 is mistakenly connected to the socket 4, the erroneous connection is noticed, while the transition to the discard mode can be performed without any erroneous operation.

Execution of the discard mode for executing the forced discharge of the secondary battery 8 is determined by further operating a predetermined switch of the operation panel 15 in a state where the operation mode is shifted to the discard mode for safety measures for preventing malfunction. It is preferable that at least a part of the operation panel 15 is configured by a touch panel. When the operation panel 15 is configured by a touch panel, the operation panel 15 includes the display device 14. By configuring the operation panel 15 with a touch panel, a switch for confirming the execution of the discard mode is displayed on the touch panel, and the execution of the discard mode is determined by operating the switch on the touch panel. The switch for confirming the execution of the discard mode is not limited to the switch on the touch panel, and may be a mechanical switch operation or may be omitted.

  Further, although the connection between the power plug 3 and the socket 4 is notified by the display 14 and the warning sound by the sounding body 19, the present invention is not limited to this, and a power display LED that lights up when the power supply is turned on is provided. It is also preferable to make it blink or display in a display color different from when the power is turned on.

  When the discharge time of the secondary battery 8 is to be shortened, the power supply device 1 is provided with a load resistor for forced discharge when the secondary battery 8 is discarded and a switch for connecting this load resistance when executing the discard mode. The load resistance and the internal circuit of the power supply device 1 may be used in combination for forcible discharge of the secondary battery 8 at the time of disposal.

  FIG. 2 is a circuit block diagram showing a power supply device of a second example according to the embodiment of the present invention, which is different from the example shown in FIG. In FIG. 2, the same component numbers as those in FIG.

  In order to detect that the power plug 3 is connected to the socket 4, a detection unit 20, a signal generation circuit 21, and a signal detection circuit 22 having operations different from those of the detection unit 12 are provided instead of the detection unit 12 of FIG. 1. Yes. The detection unit 20, the signal generation circuit 21, and the signal detection circuit 22 correspond to detection means for detecting that the power plug 3 is connected to the socket 4. One or both of the signal generation circuit 21 and the signal detection circuit 22 can be provided in the control circuit 11 or can be provided separately from the control circuit 11.

  When the power plug 3 is disconnected from the commercial AC power supply, AC power is not supplied to the input terminal 1A, and the control circuit 11 detects a power failure state and shifts to the self-discharge output mode. At the time of transition to the self-discharge output mode, the switching circuit 10 is switched to the state where the second switch 10B is opened, and the signal generation circuit 21 generates a specific signal such as a predetermined pulse set in advance. The specific signal is output from the output terminal 1B and input to the signal detection circuit 22 through the socket 4 and the power plug 3. Therefore, the signal detection circuit 22 detects the specific signal generated from the signal generation circuit 21. When the specific signal is detected by the signal detection circuit 22, the detection unit 20 detects that the power plug 3 is connected to the socket 4. When the connection between the power plug 3 and the socket 4 is detected by the detection unit 20, a display for notifying the connection is performed by the display device 14 in the same manner as the operation described for the power supply device 1 in FIG. The sounding body 19 generates a warning sound for notifying the connection between the power plug 3 and the socket 4.

  The setting of the discard mode is the same as the operation described for the power supply device 1 in FIG. 1, and the detection unit 20 included in the control circuit 11 detects that the power plug 3 is connected to the socket 4 and discards via the detection. Set to mode.

  When the detection unit 20 detects the connection between the power plug 3 and the socket 4, the display 14 displays the connection between the power plug 3 and the socket 4, and forcibly discharges the secondary battery 8. A screen for selecting whether to confirm the execution of the discard mode to be displayed is displayed. Therefore, when the operation panel 15 is operated to confirm the execution of the discard mode, the power supply device 1 enters the discard mode execution state.

  In the second embodiment, the detection that the power plug 3 is connected to the socket 4 is detected by detecting a specific signal generated from the signal generation circuit 21 by the signal detection circuit 22 when the self-discharge output mode is shifted. However, this detection may be performed after the hunting phenomenon is detected.

  In the second embodiment, the signal detection circuit 22 is connected to the input terminal 1A side and the signal generation circuit 21 is connected to the output terminal 1B side, but the signal generation circuit 21 is connected to the input terminal 1A side. The signal detection circuit 22 may be connected to the output terminal 1B side.

  The embodiment described above is for facilitating the understanding of the present invention, and each component constituting the power supply device 1 described according to the embodiment can be variously changed, and the present invention is limited. It is not for interpretation. In the embodiment, the AC / DC converter 5 and the DC / DC converter 6 correspond to the input converter, but the present invention is not limited to this, and the DC / DC converter 6 corresponds to the input converter when the input power is DC. Will do. The DC / AC converter 9 corresponds to the output converter. However, the present invention is not limited to this, and a DC / DC converter provided in place of the DC / AC converter 9 corresponds to output of DC power. It will be.

  In the embodiment, the power input terminal for supplying input power input from the external power supply corresponds to the power plug 3 connected to the commercial AC power supply, and the power output terminal from which the output power supplied to the external load is derived. Is equivalent to the socket 4, but is not limited thereto. The form of the power input terminal is variously changed depending on the supplied input power, and the form of the power output terminal is variously changed depending on the output power to be derived.

  The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

  The power supply device according to the present invention charges an external input power supplied from a power input terminal to a secondary battery, discharges the electric power charged in the secondary battery, and supplies it to an external load connected to the power output terminal. Useful for systems.

1 Power supply 2 Housing 3 Power plug (Power input terminal)
4 Socket (Power output terminal)
5 AC / DC converter (input converter)
6 DC / DC converter (input converter)
7 Charging / Discharging Circuit 8 Secondary Battery 9 DC / AC Converter (Output Converter)
DESCRIPTION OF SYMBOLS 10 Switching circuit 11 Control circuit 12 Detection part 13 DC / DC converter 14 Display 15 Operation panel 16 Radiating fan 17 Fan motor 18 Drive circuit 19 Sounding body 20 Detection part 21 Signal generation circuit 22 Signal detection circuit

Claims (13)

A secondary battery,
A power input terminal for supplying input power input from an external power source;
An input converter that converts the input power into DC power charged in the secondary battery;
An output converter that converts the DC power of the secondary battery into output power supplied to an external load;
A power output terminal from which output power supplied to an external load is derived;
A control circuit that monitors at least the voltage and current of the secondary battery and controls charging and discharging of the secondary battery;
Detecting means for detecting that the power output terminal and the power input terminal are connected;
Power supply unit with The input converter comprises at least an AC / DC converter;
The output converter comprises at least a DC / AC converter;
The power input terminal is a power plug;
The power output terminal is a socket;
2. The power supply device according to claim 1, wherein the power plug is connected to a commercial AC power source, and the socket is connected to an external electric device to which power is supplied from the commercial AC power source.   The control circuit is set to a discard mode in which discharge processing of the secondary battery is performed when the detection unit detects that the power input terminal is connected to the power output terminal. Item 1. The power supply device according to Item 1.   4. The power supply apparatus according to claim 3, wherein the control circuit sets the output converter to a driving state when the discarding mode is set. The secondary battery, the input converter, the output converter and the control circuit are provided in a housing in which a heat dissipation fan is installed,
4. The power supply apparatus according to claim 3, wherein the control circuit sets a drive circuit that drives a motor that rotates the fan to the drive state when the discard mode is set. A display for displaying a monitoring state of charge and discharge of the secondary battery by the control circuit;
A disposal confirmation switch for confirming the disposal mode;
With
The discard mode is determined by operating the discard confirmation switch in a state where the display on the display is switched to the discard mode when the discard mode is set by the control circuit. Power supply. The control circuit drives the output converter intermittently when the discard mode is set,
2. The power supply apparatus according to claim 1, wherein the detection means detects that an input signal input from the power input terminal is synchronized with an operation of the output converter.   The power supply apparatus according to claim 7, wherein the detection unit detects that the detection unit is provided in the control circuit.   The detection means includes a signal generation circuit for generating a preset specific signal output from the power plug or the socket, and a specific signal generated from the signal generation circuit and input from the socket or the power plug. The power supply apparatus according to claim 1, further comprising a signal detection circuit for detecting.   The power supply apparatus according to claim 1, wherein the control circuit notifies that the connection between the power supply output terminal and the power supply input terminal is detected by the detection means.   11. The power supply device according to claim 10, wherein the control circuit displays on a display device and notifies that the connection between the output terminal and the input terminal is detected by the detection means.   11. The power supply device according to claim 10, wherein the control circuit notifies the sounding body that the connection between the output terminal and the input terminal has been detected by the detecting means. The control circuit detects a power failure state when input power is not supplied from an external power source, and detects a power recovery state when input power supply from the external power source is resumed.
The detection means detects that a power failure state and a power recovery state are repeated by the control circuit, and detects that the output terminal and the input terminal are connected. Power supply.

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