JP2014217218A - Charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charger capable of suppressing battery capacity reduction which is caused when starts and stops of a charging circuit are frequently repeated, even when a power generation state of a photovoltaic power generator frequently changes.SOLUTION: A control circuit 15 is operated with power supplied from a battery B1. When an output voltage of a solar panel PS1 is greater than a reference voltage, the control circuit 15 starts a charging circuit 10. When output power of the solar panel PS1 or output power of the charging circuit 10 is smaller than reference power, the control circuit 15 stops the charging circuit 10, and does not restart the charging circuit 10 until 30 minutes elapses. Here, 30 minutes is start waiting time after stopping the charging circuit 10. When the starts and the stops of the charging circuit 10 are continuously repeated three times or more, the start waiting time is extended from 30 minutes to 90 minutes. Here, three times is a reference number of times of continuous start-stop repetition. Thus, it becomes possible to suppress rapid battery capacity reduction which is caused when the starts and the stops of the charging circuit 10 are frequently repeated.

Description

  The present invention relates to a charging device that charges a battery by supplying power to the battery from a solar power generation device mounted on a vehicle.

  Conventionally, as a device for supplying power from a solar power generation device, for example, there is a solar power generation inverter device disclosed in Patent Document 1 shown below.

  This solar power generation inverter device is a device that supplies electric power from a solar panel to a load. The photovoltaic power generation inverter device includes an inverter circuit and a control circuit. The inverter circuit is a circuit that converts DC power supplied from the solar panel into AC power and supplies the AC power to a load. The control circuit is a circuit that controls the inverter circuit. When the output voltage of the solar panel becomes equal to or higher than the first voltage, the control circuit activates the inverter circuit to supply power from the solar panel to the load. And if the output voltage of a solar panel becomes below 2nd voltage smaller than 1st voltage, an inverter circuit will be stopped and supply of the electric power from a solar panel to a load will be stopped.

  When the amount of solar radiation is large and the solar panel can supply sufficient power, even if power is supplied from the solar panel to the load, the output voltage of the solar panel that is higher than the first voltage immediately becomes the second voltage. It will never be Therefore, sufficient power can be supplied to the load from the solar panel.

  On the other hand, when the amount of solar radiation is small and the solar panel cannot supply sufficient power, when the power is supplied from the solar panel to the load, the output voltage of the solar panel, which is higher than the first voltage, immediately becomes the second voltage. It will drop below. Therefore, the control circuit stops the inverter circuit and stops the supply of power from the solar panel to the load. However, when the supply of power from the solar panel to the load is stopped, the output voltage of the solar panel immediately returns to the first voltage or higher. As a result, the start and stop of the inverter circuit are frequently repeated. Moreover, the inverter circuit stops immediately after startup. Therefore, almost no power can be supplied from the solar panel to the load.

  However, the control circuit does not activate the inverter circuit until the activation waiting time elapses after the inverter circuit is stopped. Here, the startup waiting time is adjusted based on the maximum output power or maximum output current of the solar panel during startup of the inverter circuit, or the startup duration of the inverter circuit. Thereby, the situation where starting and a stop of an inverter circuit are repeated frequently can be suppressed.

  In the above-described solar power inverter device, when the load is replaced with a battery and the inverter circuit is replaced with a charging circuit, a charging device that supplies power from the solar panel to the battery to charge the battery can be configured. When the control circuit operates with power supplied from the battery, the control circuit consumes power from the battery while the control circuit activates the charging circuit. Therefore, when the amount of solar radiation is small and the solar panel cannot supply sufficient power, the charging circuit is frequently started and stopped, and the battery capacity is drastically reduced. However, since the charging circuit is not started until the activation waiting time elapses after the control circuit stops the charging circuit, it is possible to suppress a situation in which the starting and stopping of the charging circuit are frequently repeated. As a result, it is possible to suppress a rapid decrease in the battery capacity that occurs when the charging circuit is frequently started and stopped.

JP 2000-023367 A

  By the way, when the solar panel is mounted on the vehicle, the power generation state of the solar panel changes more frequently than when the solar panel is fixed to the house. Therefore, when the activation waiting time is adjusted based on the maximum output power or maximum output current of the solar panel during the activation of the charging circuit, or the activation duration of the charging circuit, the charging circuit is frequently activated and deactivated. There is a possibility that the situation that is repeated cannot be sufficiently suppressed. Therefore, there has been a problem that it is not possible to sufficiently suppress the rapid decrease in the battery capacity that occurs when the charging circuit is frequently started and stopped.

  The present invention has been made in view of such circumstances, and even when the power generation state of the photovoltaic power generation apparatus changes frequently, the battery is generated by frequently starting and stopping the charging circuit. It aims at providing the charging device which can suppress the capacity | capacitance fall of this.

  The present invention made to solve the above-mentioned problems is connected to a solar power generation device and a battery mounted on a vehicle, and supplies a power to the battery from the solar power generation device to charge the battery, a battery, Connected to the charging circuit, operates with power supplied from the battery, and when the output voltage of the photovoltaic power generator is greater than the reference voltage, the charging circuit is activated to supply power to the battery from the photovoltaic power generator. When the output power of the power generation device or the output power of the charging circuit is smaller than the reference power, the charging circuit is stopped to stop the supply of power from the solar power generation device to the battery, and the charging circuit is stopped and then started In the charging device including the control circuit that does not start the charging circuit until the waiting time elapses, the control circuit repeatedly starts and stops the charging circuit. And adjusting the start waiting time based on the number.

  According to this configuration, the activation waiting time is adjusted based on the repeated state of starting and stopping of the charging circuit, which is a direct cause of the decrease in battery capacity. Therefore, the charging circuit is repeatedly started and stopped more frequently than in the conventional case where the startup waiting time is adjusted based on the maximum output power or the maximum output current of the solar panel or the startup duration of the charging circuit. Can be reliably suppressed. Therefore, even when the power generation state of the solar power generation device changes frequently, it is possible to suppress a decrease in battery capacity that occurs due to frequent start and stop of the charging circuit.

It is a circuit diagram of the charging device in a 1st embodiment. It is a wave form diagram of each part for demonstrating operation | movement of the charging device of FIG. It is a wave form diagram of each part in another state for demonstrating operation | movement of the charging device of FIG.

  Next, the present invention will be described in more detail with reference to embodiments.

(First embodiment)
First, the configuration of the charging device according to the first embodiment will be described with reference to FIG.

  A charging apparatus 1 shown in FIG. 1 is an apparatus that is mounted on a vehicle and charges the battery B1 by supplying power from the solar panel PS1 (solar power generation apparatus) to the battery B1. Here, the solar panel PS1 is a device that is mounted on a vehicle and generates power by sunlight. The battery B <b> 1 is a power source that can be charged / discharged to be mounted on the vehicle and to supply power to auxiliary devices (not shown) and the charging device 1 mounted on the vehicle. The charging device 1 includes a charging circuit 10, a voltage detection circuit 11, a current detection circuit 12, a voltage detection circuit 13, a current detection circuit 14, and a control circuit 15.

  The charging circuit 10 is a circuit that is controlled by the control circuit 15 and supplies power from the solar panel PS1 to the battery B1 to charge the battery B1. The positive input terminal and the negative input terminal of the charging circuit 10 are respectively connected to the positive output terminal and the negative output terminal of the solar panel PS1. The positive output terminal and the negative output terminal are connected to the positive terminal and the negative terminal of the battery B1, respectively. Further, the control terminal is connected to the control circuit 15.

  The voltage detection circuit 11 is a circuit that detects an output voltage of the solar panel PS1 and outputs a detection result. The voltage detection circuit 11 is connected to the positive output terminal and the negative output terminal of the solar panel PS1. The output terminal for outputting the detection result is connected to the control circuit 15.

  The current detection circuit 12 is a circuit that detects an output current of the solar panel PS1 and outputs a detection result. The current detection circuit 12 is connected between the positive electrode output terminal of the solar panel PS1 and the positive electrode input terminal of the charging circuit 10. The output terminal for outputting the detection result is connected to the control circuit 15.

  The voltage detection circuit 13 is a circuit that detects an output voltage of the charging circuit 10 and outputs a detection result. The voltage detection circuit 13 is connected to the positive output terminal and the negative output terminal of the charging circuit 10, respectively. The output terminal for outputting the detection result is connected to the control circuit 15.

  The current detection circuit 14 is a circuit that detects an output current of the charging circuit 10 and outputs a detection result. The current detection circuit 14 is connected between the positive output terminal of the charging circuit 10 and the positive terminal of the battery B1. The output terminal for outputting the detection result is connected to the control circuit 15.

  The control circuit 15 operates with electric power supplied from the battery B1, and is charged based on abnormality information input from the outside, detection results of the voltage detection circuit 11, the current detection circuit 12, the voltage detection circuit 13, and the current detection circuit 14. It is a circuit that controls the circuit 10.

  When the output voltage of the solar panel PS1 detected by the voltage detection circuit 11 is higher than the reference voltage, the control circuit 15 activates the charging circuit 10 to supply power from the solar panel PS1 to the battery B1. On the other hand, the output power of the solar panel PS1 obtained from the detection results of the voltage detection circuit 11 and the current detection circuit 12, or the output power of the charging circuit 10 obtained from the detection results of the voltage detection circuit 13 and the current detection circuit 14 is a reference. When the power is smaller than the power, the charging circuit 10 is stopped to stop the power supply from the solar panel PS1 to the battery B1. The charging circuit 10 is not started until the activation waiting time elapses after the charging circuit 10 is stopped. For example, the charging circuit 10 is not activated until 30 minutes have elapsed since the charging circuit 10 was stopped. Here, the reference power is set to a value larger than the power consumption of the control circuit 15 when the charging circuit 10 is activated.

  The control circuit 15 adjusts the activation waiting time based on the number of times the activation and deactivation of the charging circuit 10 are continuously repeated. Specifically, the activation waiting time is lengthened when the activation and deactivation of the charging circuit 10 are continuously repeated a reference number of times or more. For example, when the starting and stopping of the charging circuit 10 are repeated three or more times in succession, the activation waiting time is increased from the initial 30 minutes to 90 minutes.

  The control circuit 15 determines the power from the solar panel PS1 to the battery B1 due to a failure based on abnormality information input from the outside and detection results of the voltage detection circuit 11, the current detection circuit 12, the voltage detection circuit 13, and the current detection circuit 14. When it is determined that the supply efficiency has decreased, the startup waiting time is further increased. For example, the activation waiting time is further increased from 90 minutes to 120 minutes.

  The control circuit 15 supplies power from the solar panel PS1 to the battery B1 due to a failure based on abnormality information input from the outside and detection results of the voltage detection circuit 11, the current detection circuit 12, the voltage detection circuit 13, and the current detection circuit 14. When it is determined that it can no longer be supplied, the charging circuit 10 is stopped and the supply of power from the solar panel PS1 to the battery B1 is stopped.

  The control circuit 15 is connected to the positive terminal and the negative terminal of the battery B1 in order to receive supply of electric power necessary for the operation. In addition, the charging circuit 10, the voltage detection circuit 11, the current detection circuit 12, the voltage detection circuit 13, and the current detection circuit 14 are connected to each other.

  Next, the operation of the charging apparatus according to the first embodiment will be described with reference to FIGS.

  When the amount of solar radiation is large, the solar panel PS1 shown in FIG. 1 can output a voltage higher than the reference voltage and can supply sufficient power.

  The voltage detection circuit 11 detects the output voltage of the solar panel PS1 and outputs a detection result. The current detection circuit 12 detects the output current of the solar panel PS1 and outputs a detection result.

  The voltage detection circuit 13 detects the output voltage of the charging circuit 10 and outputs a detection result. The current detection circuit 14 detects the output current of the charging circuit 10 and outputs a detection result.

  When the output voltage of the solar panel PS1 detected by the voltage detection circuit 11 becomes higher than the reference voltage, the control circuit 15 activates the charging circuit 10 to supply power from the solar panel PS1 to the battery B1. Since the solar panel PS1 can supply sufficient power, even if power is supplied from the solar panel PS1 to the battery B1, the output power of the solar panel PS1 obtained from the detection results of the voltage detection circuit 11 and the current detection circuit 12 And the output power of the charging circuit 10 obtained from the detection results of the voltage detection circuit 13 and the current detection circuit 14 does not become smaller than the reference power. Therefore, sufficient power can be supplied from the solar panel PS1 to the battery B1 to charge the battery B1.

  On the other hand, when the amount of solar radiation is small, the solar panel PS1 can output a voltage higher than the reference voltage, but cannot supply sufficient power.

  When the output voltage of the solar panel PS1 becomes higher than the reference voltage, the control circuit 15 activates the charging circuit 10 to supply power from the solar panel PS1 to the battery B1, as shown in FIG. Thereby, the output voltage of solar panel PS1 falls and becomes below a reference voltage. However, when the output power of the solar panel PS1 or the output power of the charging circuit 10 is smaller than the reference power, the control circuit 15 stops immediately after the charging circuit 10 is started and switches from the solar panel PS1 to the battery B1. Stop supplying power. Thereby, the output voltage of solar panel PS1 rises and returns to the original voltage larger than a reference voltage. As a result, the starting and stopping of the charging circuit 10 are frequently repeated.

  However, the control circuit 15 does not activate the charging circuit 10 until 30 minutes, which is the activation waiting time, elapses after the charging circuit 10 is stopped. Therefore, the situation where the starting and stopping of the charging circuit 10 are frequently repeated can be suppressed.

  The control circuit 15 operates with electric power supplied from the battery B1. Therefore, power is consumed from the battery B1 by the control circuit 15 while the control circuit 15 activates the charging circuit 10. Moreover, since the output power of the solar panel PS1 or the output power of the charging circuit 10 is smaller than the reference power, almost no power can be supplied to the battery B1. Therefore, when the starting and stopping of the charging circuit 10 are frequently repeated, the accumulated power consumption of the battery B1 increases and the capacity of the battery B1 rapidly decreases. However, as described above, it is possible to suppress a situation in which the charging circuit 10 is frequently started and stopped. Therefore, it is possible to suppress a sudden decrease in the capacity of the battery B1 generated thereby.

  Thereafter, the control circuit 15 increases the activation waiting time from the initial 30 minutes to 90 minutes immediately after the starting and stopping of the charging circuit 10 are continuously repeated three times as the reference number (t1). Thereby, the space | interval in which starting and a stop of the charging circuit 10 are repeated becomes long, and the capacity | capacitance fall of battery B1 can be suppressed compared with before that.

  Then, the control circuit 15 detects from the abnormality information input from the outside and the detection results of the voltage detection circuit 11, the current detection circuit 12, the voltage detection circuit 13, and the current detection circuit 14 from the solar panel PS1 to the battery B1 due to a failure. When it is determined that the power supply efficiency has decreased, the activation waiting time is further increased from 90 minutes to 120 minutes (t2). Thereby, the capacity | capacitance fall of battery B1 can be suppressed as much as possible, ensuring the electric power supply to battery B1.

  Further, as shown in FIG. 3, the control circuit 15 detects that the solar circuit has failed due to failure information from externally input abnormality information and the detection results of the voltage detection circuit 11, the current detection circuit 12, the voltage detection circuit 13, and the current detection circuit 14. When it is determined that it is no longer possible to supply power from the light panel PS1 to the battery B1, the charging circuit 10 is stopped and power supply from the solar panel PS1 to the battery B1 is stopped (t3). Thereby, useless operation | movement of the control circuit 15 which does not contribute to the electric power supply to battery B1 can be suppressed. Therefore, it is possible to more reliably suppress the capacity reduction of the battery B1.

  Next, effects of the first embodiment will be described.

  According to the first embodiment, the control circuit 15 adjusts the activation waiting time based on the number of times the activation and deactivation of the charging circuit 10 are continuously repeated. That is, the start-up waiting time is adjusted based on the repeated state of the start and stop of the charging circuit 10 that is a direct cause of the decrease in the capacity of the battery B1. Therefore, the charging circuit 10 is activated and stopped as compared with the conventional case where the activation waiting time is adjusted based on the maximum output power or the maximum output current of the solar panel PS1 or the activation continuation time of the charging circuit 10 as in the past. A situation that is frequently repeated can be surely suppressed. Therefore, even when the power generation state of the solar panel PS1 frequently changes, it is possible to suppress a decrease in the capacity of the battery B1 that occurs when the charging circuit 10 is frequently started and stopped.

  According to the first embodiment, the control circuit 15 lengthens the start-up waiting time when the start and stop of the charging circuit 10 are continuously repeated a reference number of times or more. Therefore, it is possible to reliably suppress a decrease in the capacity of the battery B1 that occurs when the charging circuit 10 is frequently started and stopped.

  According to the first embodiment, the control circuit 15 further increases the startup waiting time when the efficiency of power supply from the solar panel PS1 to the battery B1 decreases due to a failure. For this reason, it is possible to suppress the decrease in the capacity of the battery B1 as much as possible while securing the power supply to the battery B1.

  According to the first embodiment, when the control circuit 15 cannot supply power from the solar panel PS1 to the battery B1 due to a failure, the control circuit 15 stops the charging circuit 10 and switches from the solar panel PS1 to the battery B1. Stop supplying power. Therefore, useless operation of the control circuit 15 that does not contribute to power supply to the battery B1 can be suppressed. Therefore, the capacity reduction of the battery B1 can be more reliably suppressed.

  In the first embodiment, the reference number is 3, and the activation waiting time is adjusted to 30 minutes, 90 minutes, and 120 minutes. However, the present invention is not limited to this. What is necessary is just to select an appropriate value according to the specification of solar panel PS1, the charging device 1, and battery B1.

DESCRIPTION OF SYMBOLS 1 ... Charging device, 10 ... Charging circuit, 11, 13 ... Voltage detection circuit, 12, 14 ... Current detection circuit, 15 ... Control circuit, PS1 ... Solar panel (solar Photovoltaic generator), B1 ... Battery

Claims (4)

A charging circuit (10) connected to a solar power generation device and a battery mounted on a vehicle, and supplying power from the solar power generation device to the battery to charge the battery;
Connected to the battery and the charging circuit, operates with electric power supplied from the battery, and when the output voltage of the photovoltaic power generator is larger than a reference voltage, activates the charging circuit to When power is supplied to the battery and the output power of the solar power generation device or the output power of the charging circuit is smaller than a reference power, the charging circuit is stopped and the power from the solar power generation device to the battery is reduced. A control circuit (15) that stops the charging circuit and does not start the charging circuit until a waiting time for starting elapses after the charging circuit is stopped;
In a charging device comprising:
The said control circuit adjusts the said start waiting time based on the frequency | count that starting and a stop of the said charging circuit were repeated continuously, The charging device characterized by the above-mentioned.   2. The charging device according to claim 1, wherein the control circuit lengthens the activation waiting time when the activation and deactivation of the charging circuit are continuously repeated more than a reference number of times.   3. The charging device according to claim 2, wherein the control circuit further increases the start-up waiting time when the efficiency of power supply from the solar power generation device to the battery is reduced due to a failure.   When the control circuit cannot supply power from the solar power generation device to the battery due to a failure, the control circuit stops the charging circuit and stops supplying power from the solar power generation device to the battery. The charging device according to any one of claims 1 to 3, wherein

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