JP2014225988A - Power charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power charger capable of prolongs the timing when a secondary battery gets overcharged when switching means cannot shut off the connection between a power generator and the secondary battery.SOLUTION: The power charger includes: a power generator; a secondary battery to be charged with the power generated by the power generator; switching means that connects/shuts off between the power generator and the secondary battery; and discharge means that discharges the secondary battery when the switching means does not function to shut off the connection. The power charger also includes: interruption fault detection means that detects a problem by which the switching means does not shut off the connection; and a discharge control section that issues a command to the discharge means to discharge the secondary battery when a problem is detected.

Description

  The present invention relates to a charging device, and more particularly, to a charging device capable of charging a secondary battery by power generation of a power generator and conducting / interrupting the connection between the power generator and the secondary battery by switching means.

  2. Description of the Related Art Conventionally, a charging device that charges a secondary battery by power generation by a power generator such as a motor generator mounted on an electric vehicle is known (see, for example, Patent Document 1). This charging device includes switching means provided on a power supply line between the generator and the secondary battery. This switching means has a function of conducting / cutting off the connection between the generator and the secondary battery. This switching means is opened to shut off the connection between the generator and the secondary battery when a temperature abnormality or overcharge of the secondary battery is detected. Therefore, according to the charging device described above, the secondary battery can be protected from temperature abnormality and overcharge by opening the switching means.

JP 2011-91899 A

  By the way, even if an open command is given to the switching unit, the switching unit may be closed and fixed, and a failure may occur in which the connection between the generator and the secondary battery is not interrupted. When such a situation occurs, if the secondary battery is charged normally by the generator, the secondary battery is unintentionally charged. Thus, the secondary battery is overcharged in a short time.

  The present invention has been made in view of the above points, and it is possible to delay the timing at which the secondary battery is overcharged as much as possible when the switching unit cannot cut off the connection between the generator and the secondary battery. An object of the present invention is to provide a simple charging device.

  The object is to provide a generator, a secondary battery charged by the power generation of the generator, switching means for conducting / interrupting the connection between the generator and the secondary battery, and the connection of the connection by the switching means. And a discharging unit that discharges the secondary battery when blocking does not function.

  According to the present invention, it is possible to delay the timing at which the secondary battery is overcharged as much as possible when the switching unit cannot cut off the connection between the generator and the secondary battery.

It is a block diagram of the charging device which is one Example of this invention. It is a flowchart of an example of the control routine performed in the charging device of a present Example. It is a flowchart of an example of the control routine performed in the charging device which is a modification of this invention. It is a flowchart of an example of the control routine performed in the charging device which is a modification of this invention.

  Hereinafter, specific embodiments of the charging device according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration diagram of a charging apparatus 10 according to an embodiment of the present invention. The charging device 10 of the present embodiment is mounted on a vehicle and is a device that charges an in-vehicle battery.

  As shown in FIG. 1, the charging device 10 includes a secondary battery 12 that can be charged and discharged, and a generator 14 that can generate power. The secondary battery 12 and the generator 14 are connected in parallel. The secondary battery 12 is, for example, a lithium ion battery or a capacitor. The secondary battery 12 is an assembled battery including a plurality of cells 16 connected in series. All the cells 16 have substantially the same storage characteristics. The power generator 14 is a small power generator that can be mounted on a vehicle and generates power of several hundred watts or less using, for example, solar, wind power, vibration, Peltier heat, or the like. The power generator 14 can generate power even when the vehicle is stopped.

  On the power line 18 on the positive electrode side of the secondary battery 12, a cutoff device 20 is provided. Further, a shutoff device 24 is provided on the power line 22 on the negative electrode side of the secondary battery 12. The interruption devices 20 and 24 are interposed between the power generator 14 on the power lines 18 and 22 and the secondary battery 12. The shut-off devices 20 and 24 are relays or contactors that conduct / shut off the connection between the power generator 14 and the secondary battery 12 via the power lines 18 and 22. When the secondary battery 12 is charged by the power generated by the generator 14, the shut-off devices 20 and 24 conduct the connection as described above. On the other hand, when the charging of the secondary battery 12 is stopped, Shut off. The connection / blocking of the connection by the blocking device 20 and the connection / blocking of the connection by the blocking device 24 are performed in synchronization.

  A load 26 is connected to the secondary battery 12. The secondary battery 12 can supply power to the load 26. The load 26 is an electric load such as a motor, an air conditioner, or an AC 100 volt power source. The load 26 is preferably a non-traveling load rather than a high-voltage load in the traveling system of the vehicle. The load 26 can operate by being supplied with power from the secondary battery 12.

  On the power line 18, a shut-off device 30 is also provided. In addition, a shutoff device 32 is provided on the power line 22. The interruption devices 30 and 32 are interposed between the secondary battery 12 and the load 26 on the power lines 18 and 22. The shut-off devices 30 and 32 are relays or contactors that conduct / shut off the connection between the secondary battery 12 and the load 26 via the power lines 18 and 22. The shut-off devices 30 and 32 conduct the connection when the load 26 is operated by the stored power of the secondary battery 12, and cut off the connection when the operation of the load 26 is stopped. The connection / blocking of the connection by the blocking device 30 and the connection / blocking of the connection by the blocking device 32 are performed in synchronization.

  An equalization circuit 34 is also connected to the secondary battery 12. The equalization circuit 34 is a circuit that equalizes the voltage of each cell 16 constituting the secondary battery 12 and equalizes the amount of electricity stored in each cell 16. The equalization circuit 34 includes a switch 36 and a resistor 38 provided for each cell 16. The switch 36 and the resistor 38 are connected in series between both ends of the corresponding cell 16, and are connected in parallel to the cell 16.

  The switch 36 is a switch that conducts / cuts off the connection between the corresponding cell 16 and the resistor 38. The switch 36 is turned on so that the connection is turned on when there is a request to lower the voltage of the corresponding cell 16 to reduce the amount of stored electricity, while the connection is made when there is no or no request. To turn off. The resistor 38 is a discharge resistor that consumes the power discharged from the corresponding cell 16. The resistor 38 consumes power by passing a current from the corresponding cell 16 when the switch 36 is on.

  The charging device 10 also includes an electronic control unit (ECU) 40 mainly composed of a microcomputer. The ECU 40 is connected to each of the shut-off devices 20, 24, 30, 32 and the switches 36 of the equalization circuit 34. The ECU 40 controls opening / closing of the shut-off devices 20, 24, 30, 32 and controls on / off of the switches 36.

  When the secondary battery 12 is to be charged by the power generated by the power generator 14, the ECU 40 instructs the shut-off devices 20 and 24 to close so that the connection between the power generator 14 and the secondary battery 12 is conducted. When the charging of the secondary battery 12 is to be stopped, an opening command is issued to the blocking devices 20 and 24 so that the connection is blocked. In addition, when the load 26 is to be operated by the stored power of the secondary battery 12, the ECU 40 instructs the shut-off devices 30 and 32 to close so that the connection between the secondary battery 12 and the load 26 is conducted. When the operation of the load 26 is to be stopped, an opening command is issued to the interrupting devices 30 and 32 so that the connection is interrupted.

  Further, the ECU 40 detects the voltage between both ends of each cell 16 of the equalization circuit 34 to detect the amount of electricity stored in each cell 16, and whether or not the voltage or the amount of electricity stored in each cell 16 has a predetermined variation or more. Is determined. When the ECU 40 determines that there is a variation, the ECU 40 turns on the switch 36 corresponding to the cell 16 having a relatively high voltage or charged amount, and the voltage of the cell 16 constituting the secondary battery 12 by the equalization circuit 34. To equalize.

  Based on the difference between the potential between the generator 14 on the power line 18 and the secondary battery 12 and the potential between the generator 14 on the power line 22 and the secondary battery 12, the ECU 40 The voltage V generated at the output terminal is detected. Further, the ECU 40 determines whether or not the power generator 14 is generating power based on the current flowing through the output terminal of the power generator 14 or the like. Then, the ECU 40 issues an open command to the shut-off devices 20 and 24, and based on the voltage V generated at the output end of the generator 14 detected when determining that the generator 14 is not generating power, the ECU 40 Is a failure in which the shut-off devices 20 and 24 are in a closed state even though the open command is issued to the shut-off devices 20 and 24 (that is, the shut-off devices 20 and 24 are It is determined whether or not a failure in which charging cannot be stopped; hereinafter referred to as a closed failure) has occurred.

  Next, the operation of the charging device 10 of the present embodiment will be described with reference to FIG. FIG. 2 shows a flowchart of an example of a control routine executed by the ECU 40 in the charging apparatus 10 of the present embodiment.

  In the charging device 10 of the present embodiment, when the secondary battery 12 is to be charged by the power generated by the power generator 14, the ECU 40 is configured so that the connection between the power generator 14 and the secondary battery 12 is conducted. 24 is instructed to close. When the shut-off devices 20 and 24 receive a close command from the ECU 40, the shut-off devices 20 and 24 conduct the connection between the power generator 14 and the secondary battery 12. When the connection between the generator 14 and the secondary battery 12 is conducted, the electric power generated by the generator 14 is supplied to the secondary battery 12. Therefore, according to this process, the secondary battery 12 can be charged with the power generated by the power generator 14.

  In addition, when the ECU 40 determines that the voltage or the amount of electricity stored in each cell 16 of the secondary battery 12 has a predetermined variation or more, the switch corresponding to the cell 16 having a relatively high voltage or amount of electricity stored in the equalization circuit 34. By turning on 36, the equalization circuit 34 is caused to equalize the voltages of the cells 16 constituting the secondary battery 12. When the switch 36 corresponding to any cell 16 is turned on in the equalization circuit 34, current flows from the positive terminal of the cell 16 to the negative terminal of the cell 16 via the switch 36 and the resistor 38. Flowing. In this case, the cell 16 is discharged, and power from the cell 16 is consumed in the resistor 38. Therefore, according to such processing, the voltage or the amount of electricity stored in each cell 16 constituting the secondary battery 12 can be equalized by discharging the cells 16 having a relatively high voltage or amount of electricity stored.

  Further, when the ECU 40 issues an opening command to the shut-off devices 20 and 24 and determines that the power generator 14 is not generating power, the ECU 40 is based on the voltage V generated at the output terminal of the power generator 14. , 24 determines whether or not a closed failure that cannot stop the charging of the secondary battery 12 has occurred.

  When the power generator 14 is not generating power, the voltage V generated at the output terminal of the power generator 14 is generally zero. On the other hand, when the power generator 14 is not generating power and the shut-off devices 20 and 24 are closed due to the open command, the connection between the power generator 14 and the secondary battery 12 is maintained, so that The voltage of the secondary battery 12 appears at the output terminal of the generator 14. Therefore, when an open command is issued to the shut-off devices 20 and 24 and the power generator 14 is not generating power, it is determined whether or not the voltage V generated at the detected output terminal of the power generator 14 is substantially zero. Thus, it is possible to determine whether or not the shut-off devices 20 and 24 have caused a closing failure with respect to the opening command.

  The ECU 40 instructs the equalization circuit 34 to discharge the secondary battery 12 when determining that the shut-off devices 20 and 24 are causing the closed failure. When such a command is issued, the switch 36 of the equalization circuit 34 is turned on, so that the cell 16 of the secondary battery 12 is discharged and the power is consumed in the resistor 38. Therefore, according to said process, when the interruption | blocking apparatuses 20 and 24 have caused the closed failure, the secondary battery 12 can be discharged and the electrical storage amount can be reduced.

  Specifically, the ECU 40 first detects the voltage of the cell 16 of the secondary battery 12 when performing the discharge process of the secondary battery 12 when the shutoff devices 20 and 24 are closed as described above (step 100). . Then, it is determined whether or not the detected voltage of the cell 16 (cell voltage) is equal to or higher than a predetermined discharge permission voltage (step 102). The discharge permission voltage is the lowest voltage that permits the discharge of the cell 16 and may be set to a predetermined value in advance.

  If the ECU 40 determines that the cell voltage of the secondary battery 12 is equal to or higher than the discharge permission voltage as a result of the process of step 102, the ECU 40 next detects the state of the shut-off devices 20 and 24 (step 104). Based on the voltage V generated at the output terminal of the power generator 14 when it is determined that the power is not generated by the power generator 14, the shut-off devices 20, 24 It is determined whether or not a closed failure that cannot stop the charging of the secondary battery 12 has occurred (step 106).

  When the voltage V generated at the output terminal of the power generator 14 is substantially zero as a result of the process of step 102, the ECU 40 can determine that the shut-off devices 20 and 24 are appropriately opened according to the opening command. In this case, the ECU 40 determines that no closing failure has occurred in the shut-off devices 20 and 24, and thereafter ends the current routine without proceeding with any processing.

  On the other hand, when the voltage V generated at the output terminal of the generator 14 is not substantially zero but reaches the vicinity of the voltage of the secondary battery 12, it can be determined that the shut-off devices 20 and 24 are closed regardless of the opening command. In this case, the ECU 40 determines that a closing failure has occurred in the shut-off devices 20 and 24, and then instructs the equalization circuit 34 to discharge the secondary battery 12 (step 108). When such a command is issued, the switch 36 of the equalization circuit 34 is turned on, so that the cell 16 of the secondary battery 12 is discharged and the power is consumed in the resistor 38.

  Of all the cells 16 constituting the secondary battery 12, the cells 16 that are discharged may be all the cells 16 constituting the secondary battery 12 or some of the cells 16. May be. Further, some of the cells 16 that are discharged may be limited to the cells 16 whose cell voltage is equal to or higher than the discharge permission voltage.

  When the ECU 40 determines that the cell voltage of the secondary battery 12 is lower than the discharge permission voltage as a result of the process of step 102, next, the ECU 40 stops the discharge command of the secondary battery 12 to the equalization circuit 34 ( Step 110). When such processing is performed, the switch 36 of the equalization circuit 34 is turned off, so that the discharge of the cell 16 of the secondary battery 12 is stopped. Note that the discharge command of the secondary battery 12 to the equalization circuit 34 may be stopped for each cell 16, and should be performed for the cell 16 whose cell voltage has dropped below the discharge permission voltage. That's fine.

  Thus, in the charging device 10 of the present embodiment, the function of the equalization circuit 34 when the shut-off devices 20 and 24 cause a closing failure and the connection between the generator 14 and the secondary battery 12 cannot be cut off. Specifically, the secondary battery 12 can be discharged by turning on the switch 36 of the equalization circuit 34. If the secondary battery 12 is discharged, the amount of electricity stored in the secondary battery 12 decreases. Therefore, according to the charging device 10 of the present embodiment, after the closing failure of the interrupting devices 20 and 24 occurs, the generator 14 generates power and the generated power is supplied to the secondary battery 12 side through the power lines 18 and 22. When the secondary battery 12 is charged, the timing at which the secondary battery 12 is fully charged can be delayed, and the timing at which the secondary battery 12 is overcharged can be delayed. .

  In the present embodiment, the discharge of the secondary battery 12 due to the closing failure of the shut-off devices 20 and 24 causes the shut-off devices 20 and 24 to close regardless of whether the generator 14 is generating power. It starts when it is detected. For this reason, according to the present embodiment, since the secondary battery 12 can be discharged immediately after the occurrence of the closing failure of the shut-off devices 20 and 24, the secondary battery after the closing failure of the shut-off devices 20 and 24 occurs. The period until 12 is fully charged by the power generation of the power generator 14 can be postponed as much as possible.

  Further, in this embodiment, in order to discharge the secondary battery 12 due to the closing failure of the shut-off devices 20 and 24, the equalization circuit 34 for equalizing the voltage of each cell 16 of the secondary battery 12 is provided. Use functions. When the switch 36 of the equalization circuit 34 is turned on, current flows from the cell 16 corresponding to the switch 36 via the switch 36 and the resistor 38, so that the cell 16 is discharged and the discharge power is changed to the resistor 38. Consumed at. Therefore, according to the present embodiment, the discharge of the secondary battery 12 due to the closing failure of the shut-off devices 20 and 24 can be realized with a simple configuration without increasing the number of parts.

  In the above embodiment, the shut-off devices 20 and 24 correspond to the “switching means” described in the claims, and the equalizing circuit 34 corresponds to the “discharge means” described in the claims. Yes. Further, based on the voltage V generated at the output terminal of the power generator 14 when the ECU 40 determines that the power is not generated by the power generator 14 when the ECU 40 issues an opening command to the power shut-off devices 20, 24, the shut-off device 20. , 24 determines whether or not a closed failure that cannot stop the charging of the secondary battery 12 has occurred, the “breaking failure detection means” described in the claims, the ECU 40 includes the breaking devices 20 and 24. The “discharge control unit” described in the claims is realized by instructing the equalization circuit 34 to discharge the secondary battery 12 when the closed failure is detected.

  By the way, in the above embodiment, in performing the discharge process of the secondary battery 12 when the shut-off devices 20 and 24 are closed, first, the voltage of the cell 16 of the secondary battery 12 is detected, and the detected cell is detected. When the voltage is equal to or higher than the discharge permission voltage, the state of the interrupting devices 20 and 24 is detected, and it is determined whether or not a closed failure has occurred in which the interrupting devices 20 and 24 cannot stop the charging of the secondary battery 12. Then, when a closed failure occurs as a result of the determination, the cell 16 of the secondary battery 12 is discharged.

  However, the present invention is not limited to this, and as shown in FIG. 3, when performing the discharge process of the secondary battery 12 when the shut-off devices 20 and 24 are closed, first of all, The state is detected (step 200), and it is determined whether or not the closing device 20 or 24 has a closed failure that cannot stop the charging of the secondary battery 12 (step 202). If the voltage of the cell 16 of the secondary battery 12 is detected (step 204), and the detected cell voltage is equal to or higher than the discharge permission voltage (when affirmative determination is made in step 206), the function of the equalization circuit 34 May be used to discharge the cell 16 of the secondary battery 12 (step 208). In addition, after the discharge of the secondary battery 12 using the function of the equalization circuit 34 is started, when the cell voltage becomes lower than the discharge permission voltage (when negative determination is made in step 206), the secondary battery 12 with respect to the equalization circuit 34 The discharge command is stopped (step 210). Also in this modification, the same effect as the above-described embodiment can be obtained.

  Further, in the above-described embodiment and the above-described modification, the discharge of the secondary battery 12 using the function of the equalization circuit 34 when the shut-off devices 20 and 24 are closed fails, and the cell voltage is discharged after the start of the discharge. Continue until the voltage drops below the permitted voltage. However, even if the secondary battery 12 is discharged using the function of the equalization circuit 34, if the amount of generated current of the generator 14 is larger than the amount of discharge current of the secondary battery 12, the secondary battery 12 Since the amount of power storage increases, the secondary battery 12 will be fully charged or overcharged as time passes.

  Therefore, in order to delay the timing at which the secondary battery 12 reaches full charge or overcharge, when the amount of generated current of the generator 14 is larger than the amount of discharge current of the secondary battery 12, the function of the equalization circuit 34 is increased. The discharge of the secondary battery 12 may be promoted by operating the load 26 connected to the secondary battery 12 while continuing the discharge of the used secondary battery 12.

  That is, the ECU 40 uses a current sensor or the like to generate the amount of current generated by the generator 14 (for example, the amount of current flowing from the output end of the generator 14 toward the power line 18 when the generator 14 generates power) and the secondary battery 12. It is assumed that both the amount of discharge current (for example, the amount of current flowing from the negative electrode of the secondary battery 12 toward the power line 20) can be detected. In addition, this detection shall be performed when the interruption | blocking apparatus 30 and 32 is open | released.

  For example, during the discharge after the start of the discharge of the cell 16 of the secondary battery 12 in step 208 in the above modification, the ECU 40 determines the amount of discharge current of the secondary battery 12 and the amount of generated current of the generator 14. Are compared (step 300). As a result of the comparison, when the discharge current amount of the secondary battery 12 is equal to or greater than the power generation current amount of the generator 14, a discharge command is issued to the equalization circuit 34 and only the function of the equalization circuit 34 is used. The secondary battery 12 is continuously discharged. On the other hand, when the amount of generated current of the generator 14 is larger than the amount of discharge current of the secondary battery 12, the discharge of the secondary battery 12 using the function of the equalization circuit 34 is maintained and further to the load 26. An operation command is issued to discharge the secondary battery 12 using the operation of the load 26 (step 302).

  When the load 26 operates in accordance with an operation command from the ECU 40, the shut-off devices 30 and 32 conduct the connection between the secondary battery 12 and the load 26, so that the load 26 is connected from the secondary battery 12 through the power lines 18 and 22. The power is supplied to the load 26, and the load 26 operates by the power supply from the secondary battery 12 and consumes power. In this regard, in this modification, the discharge amount of the secondary battery 12 is the sum of the discharge amount of the secondary battery 12 using the function of the equalization circuit 34 and the discharge amount associated with the operation of the load 26. Therefore, according to this modification, the discharge amount of the secondary battery 12 when the shut-off devices 20 and 24 are closed is increased as compared with the discharge amount of the secondary battery 12 using only the function of the equalization circuit 34. Therefore, compared with the above embodiment, it is possible to promote the discharge of the secondary battery 12 and increase the rate of decrease in the amount of stored electricity. As a result, the timing at which the secondary battery 12 is fully charged or overcharged is further increased. Can be delayed.

  In this modified example, when the cell voltage becomes lower than the discharge permission voltage after the secondary battery 12 starts discharging (when a negative determination is made in step 206), the discharge command and load of the secondary battery 12 to the equalization circuit 34 are determined. 26 may be stopped (step 304). Further, in this modified example, after the ECU 40 starts discharging the cell 16 of the secondary battery 12, the ECU 40 compares the discharge current amount of the secondary battery 12 with the generated current amount of the generator 14. The “comparison means” described in 1) is realized.

  Further, in the above-described embodiment, an open command is issued to the shut-off devices 20 and 24 that the shut-off devices 20 and 24 have a closed failure that cannot stop the charging of the secondary battery 12 by the power generation of the generator 14. Detection is based on the voltage V generated at the output terminal of the generator 14 when it is determined that the generator 14 is not generating power. However, the present invention is not limited to this. For example, the closing failure of the shut-off devices 20 and 24 is based on the amount of current flowing to the secondary battery 12 side of the shut-off devices 20 and 24 on the power lines 18 and 22. It is good also as detecting by carrying out, and it is good also as detecting by another method.

  Further, in the above embodiment, the ECU 40 directly detects that a closed failure has occurred in which the interrupting devices 20 and 24 cannot stop the charging of the secondary battery 12 by the power generation of the generator 14. However, the present invention is not limited to this, and the generator 14 itself has detected that a closed failure has occurred in which the interrupting devices 20 and 24 cannot stop the charging of the secondary battery 12 generated by the generator 14. In addition, it may be notified from the power generator 14 to the ECU 40 by communication whether or not the shut-off devices 20 and 24 are closed, and the ECU 40 may indirectly detect the closed failure.

  Furthermore, in the above embodiment, the charging device 10 is mounted on the vehicle. However, the present invention is not limited to this, and may be applied to a device mounted on other than the vehicle. .

DESCRIPTION OF SYMBOLS 10 Charging device 12 Secondary battery 14 Generator 16 Cell 18, 22 Power line 20, 24, 30, 32 Shut-off device 34 Equalizing circuit 36 Switch 38 Resistance 40 Electronic control unit (ECU)

Claims (7)

A generator,
A secondary battery charged by power generation of the generator;
Switching means for conducting / interrupting the connection between the generator and the secondary battery;
Discharging means for discharging the secondary battery when the disconnection of the connection by the switching means does not function;
A charging device comprising: An interruption failure detection means for detecting a failure in which the connection at the switching means is not interrupted;
A discharge controller that issues a command to cause the discharge means to discharge the secondary battery when the failure is detected by the shut-off failure detection means;
The charging device according to claim 1, further comprising: The secondary battery is composed of a plurality of cells,
The discharge means is an equalization circuit that discharges at least one cell to equalize the voltage of each cell,
3. The charging device according to claim 2, wherein the discharge control unit issues a command for discharging at least one cell to the equalization circuit when the failure is detected by the interruption failure detection unit. . Cell voltage determining means for determining whether the voltage of each cell is equal to or higher than a predetermined threshold;
The discharge control unit has at least the equalization circuit when the failure is detected by the interruption failure detection unit and the cell voltage determination unit determines that the voltage of each cell is equal to or higher than the predetermined threshold. The charging device according to claim 3, wherein a command for discharging one cell is issued. The discharging means is the equalization circuit and a load connected to the secondary battery,
The discharge control unit issues an instruction to discharge the at least one cell to the equalization circuit and issues an operation command to the load when the failure is detected by the interruption failure detection means. The charging device according to claim 3 or 4. When at least one cell is discharged using the function of the equalization circuit according to a command of the discharge control unit, the amount of discharge current flowing from the secondary battery is compared with the amount of power generation current flowing from the generator Comparing means to
6. The charging apparatus according to claim 5, wherein the discharge control unit issues an operation command for the load when the amount of generated current is larger than the amount of discharge current as a comparison result of the comparison unit.   The said interruption | blocking failure detection means detects the said failure based on the voltage which arises in the output terminal of this generator, when the said generator does not generate | occur | produce electric power. Charging device.

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