JP2017169323A - Charging device, control method for charging device and charging device control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deterioration of a battery even when power output from a charging device exceeds an upper limit of power that the battery can allow.SOLUTION: A charging device 10 for converting input AC power into DC power and output the DC power to a battery 20 includes a controller 103. When it is determined based on information on the state of the battery 20 that the upper limit value of charging power allowable by the battery 20 is less than the lower limit value of DC power output from the charging device 10, the controller 103 performs control so that the sum of a power value which is not more than the upper limit value and output to the battery 20 and a power value which is output to a predetermined load device 40 is not less than the lower limit value.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a charging device that converts AC power input from a power source into DC power and supplies the power to a battery, a charging device control method, and a charging device control program.

  2. Description of the Related Art Conventionally, a charging device that converts AC power input from a power source into DC power and supplies the DC power to a battery is known. For example, Patent Document 1 discloses a charging device that sets a charging current supplied to a battery to a value lower than a maximum charging current value that the battery can accept.

JP 2012-100383 A

  However, in a high-output charging device that can output DC power of, for example, 1 kW or more for shortening the charging time, if the value of the output DC power is too small, the temperature of the power element rises due to the deterioration of the power factor, and the charging device Malfunctions. Therefore, in the high-output charging device, a lower limit value (for example, 200 W) of the output DC power is set, and the DC power is controlled to be output at the lower limit value or more. When such a high output charging device is used to charge a battery having an allowable upper limit of charging power smaller than the lower limit, there is a problem that the battery deteriorates.

  An object of the present invention is to provide a charging device, a charging device control method, and a charging device control program capable of preventing deterioration of the battery even when the power output from the charging device exceeds the upper limit value of the power allowable by the battery. It is to be.

  A charging device according to one aspect of the present invention is a charging device that converts input AC power into DC power and outputs the DC power to the battery, and the charging power that the battery can accept based on information on the state of the battery When it is determined that the upper limit value is less than the lower limit value of the DC power output from the charging device, a power value equal to or lower than the upper limit value output to the battery, and a power value output to the predetermined load device The structure which has a control part which controls so that the sum total becomes more than the said lower limit is taken.

  A control method for a charging device according to an aspect of the present invention is a control method for a charging device that converts input AC power into DC power and outputs the DC power to a battery, based on information on the state of the battery, Determining whether or not the upper limit value of the charging power allowable by the battery is less than the lower limit value of the DC power output by the charging device; and if the upper limit value is less than the lower limit value, outputting to the battery And a step of controlling so that the sum of the power value equal to or lower than the upper limit value and the power value output to a predetermined load device is equal to or higher than the lower limit value.

  A charging device control program according to an aspect of the present invention allows a computer of a charging device that converts input AC power into DC power and outputs the DC power to the battery, based on the information on the state of the battery. Processing for determining whether or not the upper limit value of charging power is less than the lower limit value of DC power output by the charging device, and when the upper limit value is less than the lower limit value, the upper limit output to the battery The control is performed so that the sum of the power value equal to or lower than the value and the power value output to the predetermined load device is equal to or higher than the lower limit value.

  ADVANTAGE OF THE INVENTION According to this invention, even when the electric power output from a charging device exceeds the upper limit of the electric power which a battery can accept | permit, deterioration of a battery can be prevented.

The block diagram which shows the structural example of the charging device which concerns on embodiment of this invention, and its periphery The flowchart which shows the operation example of the charging device which concerns on embodiment of this invention

(Embodiment)
Embodiments of the present invention will be described below with reference to the drawings.

  First, the configuration of the charging device 10 according to the present embodiment and its surroundings will be described with reference to FIG. FIG. 1 is a block diagram showing an example of the configuration of the charging device 10 of the present embodiment and its periphery. In FIG. 1, solid arrows indicate the flow of power, and broken arrows indicate the flow of communication.

  The charging device 10, the battery 20, the battery monitoring unit 30, and the load device 40 illustrated in FIG. 1 are mounted on, for example, an EV (Electric Vehicle) or a PHV (Plug-in Hybrid Vehicle).

  The charging device 10 is a high-output charging device that can output DC power of 1 kW or more, for example. The charging device 10 includes an AC / DC converter 101, a DC / DC converter 102, and a control unit 103. Although illustration is omitted, a power supply filter that prevents noise intrusion and noise outflow to the power supply line may be provided in the previous stage of the AC / DC converter 101.

  AC / DC converter 101 converts AC power input from an AC power supply (not shown) into DC power, and outputs the DC power to DC / DC converter 102.

  The DC / DC converter 102 transforms the DC power from the AC / DC converter 101 and outputs the DC power only to the battery 20 or to both the battery 20 and the load device 40.

  The control unit 103 is a DSP (Digital Signal Processor), for example, and controls the AC / DC converter 101, the DC / DC converter 102, and the like.

  Since charging device 10 is a high-output charging device as described above, in order to prevent the temperature of the power element from increasing due to the deterioration of the power factor, a lower limit value of DC power output from charging device 10 (hereinafter referred to as a lower limit output power value). Is set). The control unit 103 controls the AC / DC converter 101 and the DC / DC converter 102 so as to output DC power equal to or higher than the lower limit output power value. Details of the control processing performed by the control unit 103 will be described later with reference to FIG.

  The battery 20 is electrically connected to the charging device 10 and receives DC power from the charging device 10. Thereby, the battery 20 is charged. Examples of the battery 20 include a lead battery and a lithium ion battery. In this embodiment, a battery having a battery voltage of 48V is used.

  The battery monitoring unit 30 is, for example, a BCU (Battery Control Unit), and monitors the state of the battery 20. Then, the battery monitoring unit 30 outputs information on the state of the battery 20 to the control unit 103. This information includes, for example, an upper limit value of the charging current that can be allowed by the battery 20 (hereinafter referred to as an upper limit charging current value), a value of current that actually flows through the battery 20 during charging (hereinafter referred to as a charging current value), SOC (State Of Charge) value, voltage value, and the like.

  The load device 40 is a device that is electrically connected to the charging device 10 and operates by DC power from the charging device 10. Examples of the load device 40 include a DC / DC converter, a cooling fan, an electric power steering, an air conditioner, a brake actuator, and an ABS (Antilock Brake System). In FIG. 1, only one load device 40 is illustrated, but a plurality of load devices 40 may be provided.

  In the above, the structure of the charging device 10 and its periphery was demonstrated.

  Next, an operation example of the control unit 103 of the charging apparatus 10 will be described with reference to FIG. FIG. 2 is a flowchart illustrating an operation example of the control unit 103.

  When charging device 10 is connected to an AC power source (not shown) and charging of battery 20 is started, battery monitoring unit 30 outputs an upper limit charging current value to control unit 103. And the control part 103 receives an upper limit charge flow value from the battery monitoring part 30 (step S101).

  Next, the control unit 103 calculates an upper limit charging power value based on the upper limit charging current value and the output voltage of the DC / DC converter 102 (step S102). The output voltage of the DC / DC converter 102 is measured by, for example, a voltmeter (not shown) and output to the control unit 103.

  Next, the control unit 103 determines whether or not the calculated upper limit charging power value is less than the lower limit output power value (step S103).

  As a result of the determination in step S103, when the upper limit charging power value is not less than the lower limit output power value (step S103: NO), the control unit 103 outputs DC power to the battery 20 (step S104). Then, the control unit 103 receives the SOC value from the battery monitoring unit 30 (step S105), and when the received SOC value has not reached the set value (step S106: NO), repeats the processes of steps S104 and S105. When the received SOC value reaches the set value (step S106: YES), the charging of the battery 20 ends. The set value is an SOC value set in advance as a condition for terminating charging.

  On the other hand, as a result of the determination in step S103, when the upper limit charging power value is less than the lower limit output power value (step S103: YES), the control unit 103 outputs a control signal to the load device 40 (step S107). This control signal is a signal for turning on the load device 40. The load device 40 that has received the control device 130 starts its operation. Instead of outputting a control signal directly from the control unit 103 to the load device 40, the control unit 103 outputs a control signal to an upper control unit (not shown), and the upper control unit controls the load device 40. May be.

  Next, the control unit 103 calculates DC power output to the battery 20 (hereinafter referred to as battery output power) and DC power output to the load device 40 (hereinafter referred to as load output power) (step S108).

  The battery output power calculated here is, for example, the upper limit charging power value calculated in step S102 or a predetermined value smaller than the upper limit charging power value. The load output power is the difference between the power value output from the charging device 10 (a predetermined value equal to or higher than the lower limit output power value) and the battery output power. Therefore, the sum of the battery output power and the load output power is equal to or greater than the lower limit output power value.

  Next, the control unit 103 controls the AC / DC converter 101 and the DC / DC converter 102 so that the battery output power is output to the battery 20 and the load output power is output to the load device 40 (step S109). ).

  Next, control unit 103 receives the charging current value and the SOC value from battery monitoring unit 30 (step S110).

  Next, the control unit 103 determines whether or not the received SOC value has reached a set value (step S111).

  When the received SOC value has not reached the set value (step S111: NO), the control unit 103 performs feedback control based on the charging current value (step S112). For example, the control unit 103 calculates a power value based on the charging current value and the output voltage of the DC / DC converter 102, and controls the battery output power so that the calculated power value does not exceed the upper limit charging power value. Note that it is preferable to execute the feedback control even when step S106 is NO.

  After step S112, the flow returns to step S109.

  When the received SOC value reaches the set value (step S111: YES), the charging of the battery 20 ends.

  The operation example of the control unit 103 of the charging apparatus 10 has been described above.

  As described above, charging device 10 of the present embodiment has a power value equal to or lower than the upper limit charging power value output to battery 20 and load device 40 when the upper limit charging power value is less than the lower limit output power value. Control is performed such that the sum of the output power values is equal to or greater than the lower limit output power value. As a result, even when the upper limit charging power value of the battery 20 is less than the lower limit output power value and DC power equal to or higher than the lower limit output power value is output from the charging device 10, the battery 20 is supplied to the load device 40 by supplying power to the load device 40. Since power exceeding the upper limit charging power value is not supplied, battery deterioration can be prevented.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made. Hereinafter, modified examples will be described.

(Modification 1)
In the embodiment, the case where the control unit 103 calculates the upper limit charging power value based on the upper limit charging current value received from the battery monitoring unit 30 has been described as an example. For example, the control unit 103 may include the battery monitoring unit. The upper limit charging power value may be received from 30. In this case, since the calculation process of the upper limit charging power value in step S102 of FIG. 2 can be omitted, the processing speed in the control unit 103 can be improved.

(Modification 2)
In the embodiment, the control unit 103 stops the output of DC power to the load device 40 when the power value calculated based on the charging current value received from the battery monitoring unit 30 is equal to or higher than the lower limit output power value. You may control as follows.

(Modification 3)
In the embodiment, when there are a plurality of load devices 40, control unit 103 determines the difference between the power value (predetermined value equal to or higher than the lower limit output power value) output from charging device 10 and the battery output power (hereinafter referred to as the difference). Depending on the size, the output destination of the DC power may be determined from among the plurality of load devices 40. For example, when a 12V DC / DC converter (provided separately from the DC / DC converter 102 in FIG. 1) and a cooling fan are provided in the vehicle as the load device 40, the control unit 103 is If the difference is greater than or equal to a predetermined threshold, control is performed so that DC power is output to the 12V DC / DC converter, and if the difference is less than the predetermined threshold, control is performed so that DC power is output to the cooling fan. .

  The modification has been described above. You may combine the modification mentioned above suitably.

  As mentioned above, although embodiment and the modification of this invention have been explained in full detail with reference to drawings, the function of the charging device 10 mentioned above may be implement | achieved by the computer program. For example, the DSP 15 copies a program stored in a predetermined storage device (not shown) to a RAM (Random Access Memory, not shown), and sequentially reads instructions from the program and executes them to execute charging. The function of the device 10 is realized. Further, when executing the program, the RAM or the storage device stores information obtained by various processes described in the embodiments and modifications, and is used as appropriate.

  INDUSTRIAL APPLICABILITY The present invention is useful for a charging device that converts AC power input from a power source into DC power and supplies the battery to a battery, a charging device control method, and a charging device control program.

DESCRIPTION OF SYMBOLS 10 Charging apparatus 20 Battery 30 Battery monitoring part 40 Load apparatus 101 AC / DC converter 102 DC / DC converter 103 Control part

Claims (7)

A charging device that converts input AC power into DC power and outputs it to a battery,
The upper limit value that is output to the battery when it is determined that the upper limit value of the charging power that the battery can accept is less than the lower limit value of the DC power that is output from the charging device based on the information on the state of the battery A control unit that controls the sum of the following power value and the power value output to the predetermined load device to be equal to or higher than the lower limit value;
Charging device. The controller is
After controlling to output DC power to both the battery and the load device, control is performed so that the DC power output to the battery does not exceed the upper limit value based on the charging current value of the battery. ,
The charging device according to claim 1. The controller is
When the power value calculated based on the charging current value of the battery is equal to or higher than the lower limit value, control is performed so as to stop the output of DC power to the load device.
The charging device according to claim 2. The controller is
When there are a plurality of the load devices, a plurality of the power values according to the magnitude of the difference between the power value equal to or higher than the lower limit value output from the charging device and the power value equal to or lower than the upper limit value output to the battery. Determine the output destination of DC power from the load device,
The charging device according to any one of claims 1 to 3. The controller is
When it is determined that the upper limit value is greater than or equal to the lower limit value based on information on the state of the battery, control is performed to output DC power equal to or greater than the lower limit value to the battery.
The charging device according to any one of claims 1 to 4. A method of controlling a charging device that converts input AC power into DC power and outputs the DC power to a battery,
Determining whether or not the upper limit value of the charging power allowable by the battery is less than the lower limit value of the DC power output by the charging device based on the information on the state of the battery;
When the upper limit value is less than the lower limit value, control is performed so that the sum of the power value equal to or lower than the upper limit value output to the battery and the power value output to a predetermined load device is equal to or higher than the lower limit value. And steps to
A control method for a charging device including: To the computer of the charging device that converts the input AC power into DC power and outputs it to the battery,
Based on the information on the state of the battery, a process for determining whether or not the upper limit value of the charging power that can be allowed by the battery is less than the lower limit value of the DC power output by the charging device;
When the upper limit value is less than the lower limit value, control is performed so that the sum of the power value equal to or lower than the upper limit value output to the battery and the power value output to a predetermined load device is equal to or higher than the lower limit value. Processing to
The charging device control program for executing

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