JP2006340578A - Solar power generation apparatus and charge controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the deterioration of charging efficiency to a power accumulation part, in a solar power generation apparatus. <P>SOLUTION: A switching part 1 is provided to an accumulated electric power supply line connecting a solar battery panel 9 and the power accumulation part 5, and a switching part 2 is provided to the accumulated electric power supplying line connecting an external charging terminal 10 and the accumulation part 5, allowing the switching part 1 and the switching part 2 to be turned off periodically (shut-off state) to measure a voltages between the solar battery panel 9 and the external charging terminal 10. When the measured voltage is higher than a voltage of the power accumulation part, the higher switching part is turned on (conductive state) to continue charging while, when the measured voltage is lower than the voltage of the power accumulation part, the lower switching part is maintained to be turned off as it is, to prevent a reverse electric current to the solar battery panel 9 or the external charging terminal 10 from the power accumulation part 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solar power generation device and a charge control device that controls charging of a power storage unit of the solar power generation device.

  In recent years, various energy uses have been reviewed from the viewpoint of global environmental measures, and in particular, solar cells that use solar energy are expected to be representative of clean energy sources. Generally, a power generation system using solar cells is installed and fixed on the wall of a roof or building such as a house, and connected to a commercial power source as a distributed power source. In this case, the power is designed to be supplied from a commercial power source on the grid side.

  Conventionally, as shown in, for example, Patent Document 1 and Patent Document 2, as a method for preventing a backflow of electric power generated by a solar cell, in an installation type residential solar power generation device, each input is input to an input unit of an inverter. A backflow prevention diode is used so that the power of the solar cell connected every time does not flow back to other solar cells.

  Similarly, in the case of use as an independent power source outdoors, the power of the external power source connected to the input part of the inverter or the storage battery is connected, but it does not flow backward to other solar cells connected to the input part of the inverter. A backflow prevention diode is used.

FIG. 10 is a circuit diagram showing a conventional example of the present invention. The structure of a conventional solar cell device is composed of a solar cell panel 9, an external charging terminal 10, a charge control circuit 4, a power storage unit 5, an overdischarge control circuit 6, a DC / AC inverter 7, a DC output terminal 12, and an AC output terminal 11. The charge control circuit 4 includes a charge control unit 3, overcharge control units 13 and 14, and backflow prevention diodes 15 and 16.
JP-A-61-210827 JP-A-61-210828

  Even in a solar power generation device for an independent power source, the backflow from the storage battery to the solar battery is prevented by a backflow prevention diode when the solar battery is not generating power at night or the like. As a result, there is a drawback in that power loss occurs due to the backflow prevention diode during charging, and charging efficiency decreases.

  In particular, a portable solar power generation device may be stored for a long time without being charged by generated power, and the storage battery is in an overdischarged state.

  Further, in the configuration using the backflow prevention diode, there is a possibility that the charging control circuit may be damaged when the solar cell panel and the external charging terminal are short-circuited or reversely connected, or when a high voltage power source is connected.

  The present invention has been conceived in view of such circumstances, and an object thereof is to prevent a reduction in charging efficiency of a power storage unit in a solar power generation device.

  The present invention is a photovoltaic power generation apparatus including a power storage unit, provided in a power supply line for supplying and charging the generated charging power to the power storage unit, the power supply line being in an energized state or a cut-off state A switching unit that switches to a periodic state, a periodic cutoff control unit that performs control to periodically switch the energized switching unit to a cutoff state, and when the switching unit is periodically switched to the cutoff state by the periodic cutoff control unit Periodic voltage measuring means for measuring the voltage of the charging power, and voltage determining means for determining whether the voltage measured by the periodic voltage measuring means is a voltage necessary for charging the power storage unit; Energizing state return means for returning the switching unit to the energized state on condition that the voltage determining means determines that the voltage is necessary for charging. For example, characterized in that is.

  Another aspect of the present invention is a charge control device that controls charging of a power storage unit in a solar power generation device, and is provided in a power supply line for supplying charging power to a power storage unit for charging. A switching unit that switches the power supply line to an energized state or an interrupted state, a periodic interrupting control unit that performs control to periodically switch the energized switching unit to an interrupted state, and the periodic interrupting control unit periodically The periodic voltage measuring means for measuring the voltage of the charging power when switched to the shut-off state, and whether the voltage measured by the periodic voltage measuring means is a voltage necessary for charging the power storage unit On the condition that the voltage determination means for determining whether or not the voltage determination means determines that the voltage is necessary for charging. Characterized in that it comprises a conducting state returning means for returning to the state.

  Preferably, the voltage determination unit further includes a cut-off state holding unit that holds the switching unit in a cut-off state when it is determined that the voltage is not necessary for charging. When it is determined by the determination means that the voltage is not necessary for charging, when the next periodic voltage measurement timing comes with the switching unit held in the shut-off state Measure the voltage of the charging power.

  Preferably, the microcomputer includes a periodic interruption control means and an energized state return means, and performs a charge control, a discharge determination means for determining whether or not the power storage unit supplies power to the load, and a discharge determination thereof A timing means for measuring the duration of the state in which the means determines that power is not being supplied to the load and the switching unit is held in the shut-off state, and the timing means sets in advance Standby mode switching means for stopping the operation of the microcomputer by stopping the power supply to the microcomputer and switching to the standby mode in which the switching unit is held in a shut-off state when the specified time is counted. .

  Preferably, the periodic voltage measuring unit measures the voltage of the charging power even when the standby mode switching unit is in the standby mode, and the charging control device is in the standby mode by the standby mode switching unit. In some cases, it is further provided with normal mode return means for restarting the power supply to the microcomputer and returning to the normal mode in which the microcomputer operates when the voltage exceeding the reference value is measured by the periodic voltage measurement means.

  Preferably, the switching unit is a MOSFET (metal-oxide semiconductor field-effect transistor) circuit.

  According to the present invention, the switching unit provided in the power supply line for supplying the charging power to the power storage unit for charging is periodically switched to the cut-off state, and the charge power in the cut-off state Using a reverse current prevention diode to charge the switching unit back to the energized state, provided that the voltage of the switching unit is measured and the measured voltage is a voltage necessary for charging the charging unit. Therefore, the backflow of current from the power storage unit can be prevented, and a reduction in charging efficiency due to power loss due to the backflow prevention diode can be prevented as much as possible.

  Further, the charging control is performed when the power storage unit is not supplying power to the load and the duration of the state in which the switching unit is held in the cut-off state has reached a predetermined time. When the operation of the microcomputer is stopped and power supply to the microcomputer is stopped, the control power supplied from the power storage unit to the microcomputer is reduced when the microcomputer is switched to the standby mode in which the switching unit is held off. Power consumption can be reduced.

  The present invention will be described with reference to FIG. Here, FIG. 1 is a circuit diagram of a photovoltaic power generation apparatus showing one embodiment of the present invention, and is an example in the case where there are two input systems. The solar power generation device of the present invention is connected to a solar cell panel 9, an external charging terminal 10, a charge control circuit 4, a power storage unit 5 made of, for example, a lithium storage battery, an overdischarge control circuit 6, a DC / AC inverter 7, and a DC load. It comprises a DC output terminal 12 and an AC output terminal 11 to which an AC load is connected.

  Here, the charge control circuit 4 measures a charge control unit 3 constituted by a microcomputer, for example, a switching unit 1 comprising a metal-oxide semiconductor field-effect transistor (MOSFET) circuit, a switching unit 2, a timer 8, and a voltage. A voltage monitor 17 is provided.

  FIG. 1 is roughly composed of a discharge side circuit that consumes power and a charge side circuit that charges power. The circuit on the discharge side that consumes power is connected to the AC output terminal 11 and the load connected to the power storage unit 5 via the DC / AC inverter 7 and the overdischarge control circuit 6, and the DC output terminal 12. The load that is connected to the power storage unit 5 via the overdischarge control circuit 6 is configured, and the charge-side circuit that charges the power is stored via the switching unit 1 connected to the solar cell panel 9. And a system connected to the power storage unit 5 via the switching unit 2 connected to the external charging terminal 10.

  The voltage monitor 17 is installed in both systems so that the voltage on the solar panel 9 side or the input voltage of the external charging terminal 10 can be measured, and the voltage on the solar panel 9 side and the input of the external charging terminal 10 once every 10 seconds. Measure the voltage. The charging control unit 3 controls opening and closing of the switching units 1 and 2 using the measured value. The charging control unit 3 controls the switching timing of the switching units 1 and 2 and the voltage measurement timing based on the time data obtained from the timer 8. Further, the overdischarge control circuit 6 detects the presence or absence of power supply to the connected load, and performs control so as not to discharge more than the remaining power of the power storage unit 5.

  Further, in the present embodiment, a measurement line is connected to the power storage unit 5 so that the voltage value of the power storage unit 5 can be monitored, and an information line for connecting the charge control unit 3 with or without power supply to the load is connected.

It continues and demonstrates the control method of the solar power generation device of this invention.
For example, in a state where charging is possible indoors and outdoors, when charging control of the generated power of the solar cell panel to the internal power storage unit 5 is performed, the charge control unit 3 connects the MOSFET as the switching unit 1 between the solar cell panel and the power storage unit 5. Periodically “ON” and “OFF” operations are performed, and the voltage of the solar cell panel 9 is detected when “OFF”. If the voltage is below the reference value, the “OFF” state is maintained. When the voltage becomes equal to or higher than the reference, “ON” is set and charging of the power storage unit 5 is started.

  Alternatively, when charging control of the power of the charger connected to the external charging terminal 10 to the internal power storage unit 5, the charging control unit 3 connects the MOSFET as the switching unit 2 between the external charging terminal and the power storage unit 5 in the same manner as described above. Periodically “ON” and “OFF” operations are performed, and when the voltage is “OFF”, the voltage of the voltage monitor 17 is detected. If the voltage is equal to or less than the reference value, the external charging terminal 10 is determined not to be connected, and [OFF] Keep state.

  When the voltage of the external charging terminal 10 becomes equal to or higher than the reference, it is determined that power is input from the external charging terminal 10, the switching unit 2 composed of a MOSFET circuit is turned “ON”, and charging is started.

  Even when the solar panel 9 and the external charger are connected simultaneously, the switching control is independently performed by the method described above, and the solar panel 9 and the external charger are efficiently charged with the total power. .

  Referring to FIG. 2, when charge control is performed on the generated power of solar cell panel 9 to internal power storage unit 5, for example, switching unit 1 between solar cell panel 9 and power storage unit 5 is turned “ON” and “OFF” at 10-second intervals. ] Is performed for 0.2 seconds, and the switching unit 2 between the external charging terminal 10 and the power storage unit 5 is turned “ON” at intervals of 10 seconds, and [OFF] is repeated for 0.2 seconds. The “OFF” operation is performed.

  While the switching unit 1 between the solar cell panel 9 and the power storage unit 5 is set to “OFF”, the voltage monitor 17 detects the voltage of the solar cell panel 9 and the reference value set in advance by the charge control unit 3. In comparison, if it is less than the reference value, it is determined that the solar cell panel 9 is not generating power, the switching unit 1 is held in the “OFF” state, and the solar cell panel 9 is disconnected from the power storage unit 5 to store electricity. The backflow from the unit 5 to the solar cell panel 9 is prevented, and the outflow of power in the power storage unit 5 is prevented. In addition, when the voltage of the solar cell panel 9 becomes equal to or higher than the reference, the switching unit 1 is turned “ON” and charging is started, so that loss of charging to the power storage unit 5 can be eliminated and efficient operation can be performed.

Next, the standby mode will be described with reference to FIG. 4, Table 5, and Table 6.
When the switching unit 1 and the switching unit 2 are kept in the “OFF” state, the overdischarge control unit 6 detects whether there is no supply to the load (DC output terminal 12, AC output terminal 11), and the load ( When it is determined that there is no supply to the DC output 12 and the AC output 11), the timer 8 is operated, and the charging control circuit operation is stopped after a certain time (for example, 3 hours) to shift to the standby mode, thereby reducing the consumption. To do.

  This standby mode is a state in which only the voltage monitor 17 that measures the power generation voltage of the solar battery panel 9 and the input voltage from the external charging terminal 10 is operating, and the microcomputer of the charging control unit 3 is stored in an operation stopped state. That is, the control power from the unit 5 is not received. Even during the standby mode, the voltage monitor 17 measures the voltage between the solar battery panel 9 and the external charging terminal 10 once every 10 seconds.

  Further, when the voltage of the solar panel 9 becomes higher than the standard during the standby mode, the switching unit 1 is turned “ON” to charge the power storage unit 5 from the solar panel 9 in order to return from the standby mode. Can be done.

  When the voltage of the external charging terminal 10 becomes equal to or higher than the reference during the standby mode, the switching unit 2 of the charging control unit is turned “ON” to return from the standby mode. I was able to charge.

  Further, when the supply to the load starts during the standby mode, that is, when the overdischarge control unit 6 detects the connection of the load, the standby mode is returned to the normal mode.

  Next, referring to FIG. 3, Table 3, and Table 4, when the power generation capacity is outside the upper limit value or when the external charging terminal is connected to the external charge terminal that is higher than the upper limit value, the voltage of each input system is By measuring with the monitor 17 and comparing with the upper limit value, the control unit determines that it is out of specification, the switching unit 1 or 2 is kept in the “OFF” state, and the high voltage connection of the solar cell panel 9 and the external charging terminal 10 is prevented. Is realized.

  Next, referring to FIG. 5 and Table 7, if the value of the voltage of each input system measured by the voltage monitor 17 is below the lower limit value, it is determined that the input system is short-circuited. The switching unit 1 or 2 is determined to be reversely connected, and the “OFF” state is maintained, thereby preventing troubles such as circuit damage or electric shock due to poor connection and incorrect connection of the solar cell panel 9 and the external charging terminal 10. .

  Next, with reference to Table 8, overcharge and overdischarge prevention circuits and conditions of power storage unit 5 will be described.

  When the power storage unit 5 is charged by an external power source, the overcharge prevention circuit used in the present invention can charge the power storage unit 5 with a constant current, and is overcharged in accordance with the standard charging characteristic curve of the power storage unit 5. It is enough to cut the charging when it becomes. In addition, when charging with the solar cell panel 9, since the charging current changes depending on the weather (insolation amount), it cannot be predicted with the standard charging characteristic curve of the power storage unit 5. It is preferred to do so. An example of overcharge voltage by charging current is as shown in Table 1 below.

  For example, when the nominal voltage of the solar panel 9 is 12V, 10 single cells are connected in series to form the solar panel 9, and the overcharge operating voltage at the time of charging at a temperature of 25 degrees and a charging current of 1500 mA is set to 15V. Thus, the generated voltage 12V is ensured within the range of normal use.

  Subsequently, the discharge of the power storage unit 5 will be described. If the overdischarge of the power storage unit 5 is to be detected accurately, the discharge to the load can be cut and predicted from the standard discharge current curve (see Table 2) of the power storage unit 5 to prevent overdischarge, but the load is constant. Therefore, the overdischarge prevention circuit 6 used in the present invention determines a safe power storage unit voltage, for example, 11 V from the standard discharge current curve, and cuts the discharge to the load when the power storage unit voltage becomes lower than that voltage.

  For example, when the nominal voltage of the solar cell panel 9 in which 10 single cells are connected in series is 12 V, the safe storage battery voltage of the solar cell panel 9 is set to 11 V (single cell voltage × 10).

  Next, the microcomputer constituting the charging control unit 3 includes a CPU as a control center, a ROM storing a control program, a RAM functioning as a work area of the CPU, an I / O port, and the like. . The control operation of this microcomputer will be described based on the flowcharts shown in FIGS.

  Referring to FIG. 6, an initialization process is performed in step S (hereinafter simply referred to as S) 1. This is a process for initializing data such as RAM when the microcomputer is supplied with control power from the power storage unit 5 and the microcomputer is turned on. Next, the process proceeds to S2, an abnormality process is performed, the process proceeds to S3, the normal process is performed, the process proceeds to S4, a standby mode transition condition determination process is performed, and whether the standby mode transition condition is satisfied in S5. It is determined whether or not the transition condition flag storing whether or not is ON. If it is not ON, the processing of S2 to S5 is repeatedly executed.

  If the transition condition flag is ON, the control proceeds to S6, and after the transition condition flag is turned OFF, an operation stop process is performed in S7. This operation stop process is a process for stopping the operation of the microcomputer so that the control power from the power storage unit 5 is not consumed. In the state where the operation stop process is performed and the standby mode is set, the microcomputer is started and started if the return condition from the standby mode shown in Table 6 is satisfied. It returns to the normal state that consumes the control power.

  FIG. 7 is a flowchart showing a subroutine program of the abnormal time process shown in S2 of FIG. This abnormal process is a process for dealing with abnormalities such as short circuit abnormality between terminals, reverse voltage application abnormality, overdischarge, overcharge and the like shown in Tables 7, 8, and 5. First, in S10, it is determined whether or not the input voltage is abnormal. This input voltage means both the input voltage from the solar battery panel 9 and the input voltage from the external charging terminal 10, and the voltage measured by the voltage monitor 17 is an abnormal voltage as shown in Table 7. This is a process for determining whether or not. If it is determined that the voltage is abnormal, the control proceeds to S16, where processing for turning on the abnormality flag 1 is performed, and control for turning off both switching units 1 and 2 is performed through S17. On the other hand, if it is determined in S10 that the input voltage is not abnormal, the control advances to S11, and processing for turning off the abnormality flag 1 is performed.

  Next, the control proceeds to S12, where it is determined whether or not the overcharge voltage has been measured by the voltage monitor 17, and if it has been measured, the process proceeds to S18 to perform processing for turning on the abnormality flag 2, and S19. Thus, both the switching units 1 and 2 are turned off, the overdischarge control circuit 6 is turned on, and the current of the power storage unit 5 is controlled to be supplied to the DC load or the AC load. On the other hand, when it is determined at S12 that the overcharge voltage is not measured, control to turn off the abnormality flag 2 is performed at S13.

  Next, the control proceeds to S14, where it is determined whether or not the overdischarge voltage has been measured by the overdischarge control circuit 6. If measured, the process proceeds to S20, the abnormality flag 3 is turned on, and both switching is performed by S21. The units 1 and 2 are turned on, the overdischarge control circuit 6 is turned off, and the direct current load and the alternating current load of the power storage unit 5 are controlled to be electrically cut off. On the other hand, if it is determined in S14 that the overdischarge voltage has not been measured, the abnormality flag 3 is turned OFF in S15, and the subroutine program for this abnormality processing ends.

  By detecting the input voltage of the solar cell panel 9 and the external charging terminal 10 with the voltage monitor 17 and controlling the switching units 1 and 2 with the charge control unit by the subroutine program of the abnormal time processing, the solar cell panel 9 and the external It is also possible to prevent the charging terminal 10 from being short-circuited, prevented from being reversely connected, or prevented from being connected to the external charging terminal 10, thereby ensuring safety and avoiding malfunction of the apparatus.

  FIG. 8 is a flowchart showing a subroutine program of the normal processing shown in S3. This normal processing is processing for performing the control shown in FIG. First, in S30, it is determined whether or not any of the abnormality flags 1 to 3 is ON. If so, the subroutine program for normal processing is terminated. On the other hand, if it is not ON, the control proceeds to S31, and it is determined whether or not the charge disable flag 1 is ON. The unchargeable flag 1 is a flag for storing whether or not the power generation voltage of the solar battery panel 9 is lower than the voltage of the power storage unit 9 and cannot be charged, and is turned on by S44 described later and turned off by S36. If the unchargeable flag 1 is not ON, a determination is made in S32 as to whether or not the ON state of the switching unit 1 has continued for 10 seconds. If not, the control proceeds to S37, but continues. If YES in step S33, the flow advances to step S33 to control the switching unit 1 to be turned off for 0.2 seconds. During the 0.2 second OFF, as described above, the voltage monitor 17 measures the power generation voltage of the solar cell panel 9, and the input voltage that is the measured power generation voltage of the solar cell panel 9 and the power storage unit 5 is determined in S34. If the input voltage is larger than the power storage unit voltage, the control proceeds to S35, a process for returning the switching unit 1 to the ON state is performed, and a process for turning off the unchargeable flag 1 is performed in S36. . On the other hand, if it is determined in S34 that the input voltage is equal to or lower than the power storage unit voltage, the control proceeds to S44, and a process for turning on the unchargeable flag 1 is performed.

  On the other hand, if it is determined in S31 that the unchargeable flag 1 is ON, the control proceeds to S43, the switching unit 1 is held OFF, and the control proceeds to S34.

  Next, in S37 to S46, the same control as that of S30 to S44 described above is performed on the input voltage from the external charging terminal 10. Specifically, it is determined whether or not the unchargeable flag 2 is turned on by S37, and if it is not turned on, whether or not the ON state of the switching unit 2 continues for 10 seconds by S38. This subroutine program ends if it has not been continued for 10 seconds, but if it has been continued for 10 seconds, the process proceeds to S39, where control is performed to turn off the switching unit 2 for 0.2 seconds. . Next, in S40, it is determined whether or not the input voltage from the external charging terminal 10 is larger than the power storage unit voltage. If the input voltage is larger, the process of returning the switching unit 2 to the ON state is performed in S41, and the charging is performed in S42. Processing to turn off the flag 2 is performed. On the other hand, if the input voltage is smaller than the power storage unit voltage, the control proceeds to S46, the charging flag 2 is set to ON, and this subroutine program ends. On the other hand, if it is determined in S37 that the unchargeable flag 2 is ON, the control proceeds to S45, the switching unit 2 is held OFF, and the control proceeds to S40.

  Even when the switching unit 1 or the switching unit 2 is turned off by the above-described S43 or S45, the voltage monitor 17 performs the voltage measurement operation once every 10 seconds shown in FIG.

  FIG. 9 is a flowchart showing a subroutine program of the standby mode transition condition determination process shown in S4. This standby mode transition condition determination processing is a subroutine program that performs processing for determining whether or not the transition conditions shown in Table 5 are satisfied. In S50, it is determined whether or not the generated voltage of the solar battery panel 9 is equal to or lower than the reference voltage. In the following case, the process proceeds to S51, and whether or not the input voltage of the external charging terminal 10 is equal to or lower than the reference voltage. In the following case, a determination is made as to whether or not the current consumption of the DC load is 0A in S52. In the case of 0A, the control proceeds to S53, and whether or not the current consumption of the AC load is 0A. In the case of 0A, the control advances to S54 to determine whether or not the timer has timed for 3 hours. If the time has not yet been measured for 3 hours, this subroutine program ends.

  On the other hand, when the subroutine program for the standby mode transition condition determination process is repeatedly executed, each step of S50 to S53 is determined, and if NO is determined in any of the steps of S50 to S53, Proceeding to S56, processing for clearing the timer is performed. When the subroutine program of the standby mode transition condition determination process is repeatedly executed and the state continues for 3 hours without determining NO in any of the steps S50 to S53, a determination of YES is made in S54. Then, the process proceeds to S55, a process for turning on the transition condition flag is performed, and this subroutine program ends.

  Next, the contents of the embodiment corresponding to the configuration requirements of the present invention are inserted in parentheses, and the correspondence between each configuration requirement and the embodiment is shown below.

(1) A solar power generation device (solar power generation device shown in the circuit diagram of FIG. 1) including a power storage unit (power storage unit 5),
Provided on a power supply line (for example, a charging power supply line between the solar cell panel 9 and the power storage unit 4) for supplying and charging the generated charging power to the power storage unit, and the power supply line Switching unit (for example, switching unit 1, switching unit 2, etc.) that switches the power supply state to the energized state (for example, ON) or the cutoff state (for example, OFF),
Periodic shut-off control means (for example, S32, S33, S38, S39, etc.) for performing control to switch the energized switching unit to the shut-off state periodically (for example, every 10 seconds);
Periodic voltage measuring means (for example, voltage monitor 17 or the like) for measuring the voltage of the charging power when the switching unit is periodically switched to the cutoff state by the periodic cutoff control means;
Voltage determination means (for example, S34, S40, etc.) for determining whether or not the voltage measured by the periodic voltage measurement means is a voltage necessary for charging the power storage unit;
Energization state return means (for example, S35, S41, etc.) for returning the switching unit to an energized state on condition that the voltage determination means determines that the voltage is necessary for charging. It is characterized by having.

(2) A charge control device (for example, a charge control circuit 4, an overdischarge control circuit 6 or the like) that controls charging of the power storage unit in the solar power generation device,
A power supply line for supplying charging power to the power storage unit (for example, a charging power supply line between the solar battery panel 9 and the power storage unit 4, between the external charging terminal 10 and the power storage unit 4) A switching power unit (e.g., switching unit 1, switching unit 2) that is provided in a charging power supply line or the like and switches the power supply line to an energized state (e.g., ON) or a cutoff state (e.g., OFF);
Periodic shut-off control means (for example, S32, S33, S38, S39, etc.) for performing control to switch the energized switching unit to the shut-off state periodically (for example, every 10 seconds);
Periodic voltage measuring means (for example, voltage monitor 17 or the like) for measuring the voltage of the charging power when the switching unit is periodically switched to the cutoff state by the periodic cutoff control means;
Voltage determination means (for example, S34, S40, etc.) for determining whether or not the voltage measured by the periodic voltage measurement means is a voltage necessary for charging the power storage unit;
Energization state return means (for example, S35, S41, etc.) for returning the switching unit to an energized state on the condition that the voltage determination means determines that the voltage is necessary for charging. It is characterized by having.

(3) When the voltage determination means determines that the voltage is not necessary for charging (for example, NO by S34, NO by S40, etc.), the switching unit is held in a shut-off state. It further includes a blocking state holding means (for example, S31, S43, S44, S37, S45, S46, etc.)
When the voltage measuring unit determines that the voltage is not necessary for charging by the voltage determining unit, the voltage measuring unit performs the next periodic operation in a state where the switching unit is maintained in a cut-off state. When the voltage measurement time comes, the voltage of the charging power is measured (for example, the voltage monitor 17 measures the voltage in the OFF state by S43 and S45).

(4) a microcomputer (for example, a microcomputer provided in the charge control unit 3) that includes the periodic shut-off control means and the energized state return means, and performs charge control;
Discharge determination means (for example, an overdischarge control circuit 6) for determining whether or not the power storage unit supplies power to a load;
A state in which the discharge determining means determines that power is not being supplied to the load (for example, both S52 and S53 are YES) and the switching unit is held in a cut-off state (for example, , Time counting means (for example, timers of S54, S56, etc.)
When a predetermined time (for example, 3 hours) determined in advance by the time measuring means is measured (for example, when YES is determined in S54), the microcomputer is stopped to operate the microcomputer. And a standby mode switching means (for example, S55, S5, S7, etc.) for switching to a standby mode in which the switching unit is held in the shut-off state.

(5) The periodic voltage measuring unit measures the voltage of the charging power even when the standby mode switching unit is in the standby mode (for example, when the voltage monitor 17 is in the standby mode). , The voltage measurement operation is performed once every 10 seconds)
The charging control device restarts power supply to the microcomputer when a voltage equal to or higher than a reference value is measured by the periodic voltage measuring unit when the standby mode switching unit is in the standby mode. Normal mode return means for returning to the normal mode in which the microcomputer operates (for example, in the state where the operation stop processing is performed and the standby mode is set, the return condition from the standby mode shown in Table 6 is satisfied) In this case, the microcomputer is further started up and started up.

  (6) The switching unit is a MOSFET (metal-oxide semiconductor field-effect transistor) circuit.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a circuit diagram showing one embodiment of the present invention. It is a figure which shows the timing chart of this invention. It is a figure which shows the timing chart of this invention. It is a figure which shows the timing chart of this invention. It is a figure which shows the timing chart of this invention. It is a flowchart which shows the control action of the microcomputer provided in the charge control part. It is a flowchart which shows the subroutine program of the process at the time of abnormality. 3 is a flowchart showing a subroutine program for normal processing. 5 is a flowchart showing a subroutine program for standby mode transition condition determination processing. It is a circuit diagram which shows a prior art example.

Explanation of symbols

  1, 2 switching unit, 3 charge control unit, 4 charge control circuit, 5 power storage unit, 6 overdischarge control circuit, 7 DC / AC inverter, 8 timer, 9 solar panel, 10 external charging terminal, 11 AC output terminal, 12 DC output terminal, 13 Overcharge control unit, 14 Overcharge control unit, 15 Backflow prevention diode, 16 Backflow prevention diode. 17 Voltage monitor.

Claims (6)

A solar power generation device including a power storage unit,
A power supply line for supplying and charging the generated charging power to the power storage unit, and switching the power supply line to an energized state or a cut-off state;
Periodic interruption control means for performing control to periodically switch the energized switching unit to the interruption state;
Periodic voltage measuring means for measuring the voltage of the charging power when the switching unit is periodically switched to the shut-off state by the periodic shut-off control means;
Voltage determination means for determining whether or not the voltage measured by the periodic voltage measurement means is a voltage necessary for charging the power storage unit;
And an energization state return means for returning the switching unit to an energized state on the condition that the voltage determination means determines that the voltage is necessary for charging. A solar power generator. A charge control device that controls charging of a power storage unit in a solar power generation device,
A power supply line for supplying power for charging to the power storage unit for charging, and a switching unit for switching the power supply line to an energized state or a cut-off state;
Periodic interruption control means for performing control to periodically switch the energized switching unit to the interruption state;
Periodic voltage measuring means for measuring the voltage of the charging power when the switching unit is periodically switched to the shut-off state by the periodic shut-off control means;
Voltage determination means for determining whether or not the voltage measured by the periodic voltage measurement means is a voltage necessary for charging the power storage unit;
And an energization state return means for returning the switching unit to an energized state on the condition that the voltage determination means determines that the voltage is necessary for charging. A charge control device. In the case where it is determined that the voltage is not necessary for charging by the voltage determination unit, the voltage determination unit further includes a cutoff state holding unit that holds the switching unit in a cutoff state.
When the voltage measuring unit determines that the voltage is not necessary for charging by the voltage determining unit, the voltage measuring unit performs the next periodic operation in a state where the switching unit is maintained in a cut-off state. The charging control device according to claim 2, wherein the voltage of the charging power is measured when a proper voltage measurement time comes. A microcomputer that performs charging control, including the periodic shut-off control means and the energized state return means;
Discharge determining means for determining whether or not the power storage unit supplies power to a load;
Clocking means for timing the duration of the state in which the discharge determination unit determines that power is not being supplied to the load and the switching unit is held in a shut-off state;
When the predetermined time is measured by the time measuring means, the operation of the microcomputer is stopped to stop the power supply to the microcomputer, and the standby mode in which the switching unit is held in the shut-off state. 4. The charging control device according to claim 2, further comprising standby mode switching means for switching. The periodic voltage measuring means measures the voltage of the charging power even when the standby mode switching means is in the standby mode,
The charging control device restarts power supply to the microcomputer when a voltage equal to or higher than a reference value is measured by the periodic voltage measuring unit when the standby mode switching unit is in the standby mode. 5. The charge control device according to claim 2, further comprising normal mode return means for returning to a normal mode in which the microcomputer operates.   6. The charging control apparatus according to claim 2, wherein the switching unit is a MOSFET circuit.

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