JP2017010813A - Power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply system capable of properly suppressing progress in lifetime deterioration of a secondary battery.SOLUTION: A power supply system comprises: a rectification circuit 11 which rectifies output of an AC power source 50; a control power supply 12 which steps down output of the rectification circuit 11 to a first DC voltage Va and applies the voltage to a control load 18; a battery charger 13 which converts the output of the rectification circuit 11 into a second DC voltage Vb lower than the first DC voltage Va and charges a secondary battery 2; a voltage detection part 14 which detects a terminal voltage across the secondary battery 2; and a control part 16 which determines abnormality of the secondary battery 2 in steps on the basis of a detection value of the voltage detection part 14 and a calculated value of a temperature calculation part 21a, and determines abnormality of the secondary battery 2 in steps using at least one of an ambient temperature, a lifetime deterioration diagnostic result of the secondary battery 2, and a use cumulative time of the secondary battery 2.SELECTED DRAWING: Figure 1

Description

  The present invention includes a power supply system that includes a secondary battery for backup, converts AC power supplied from an AC power source such as a commercial power source into DC power by a rectifier circuit, and supplies the DC power to a control load, and a power supply system The present invention relates to a method for managing a backup secondary battery.

  One of the management items of the secondary battery for backup is overcharge protection for the secondary battery. Patent Document 1 below discloses a method of performing overcharge protection of a secondary battery in a double manner by measuring the output voltage and current of the charger and the voltage and current of the secondary battery, and either one is the first. It is disclosed that the charger is stopped when the threshold value is exceeded, and that the electrical path between the charger and the secondary battery is interrupted when the second threshold value is greater than the first threshold value. Yes.

Japanese Patent Laid-Open No. 11-164490

  However, in the above conventional method, since there is no concept of temperature correction, elapsed time correction, or life deterioration correction in the protection logic for protecting the secondary battery, it is possible to appropriately suppress the progress of the life deterioration of the secondary battery. There was a problem that I could not.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the electric power supply system which can suppress appropriately progress of the lifetime deterioration of a secondary battery.

  In order to solve the above-described problems and achieve the object, the present invention includes a backup secondary battery, and converts AC power supplied from an AC power source into DC power by a rectifier circuit to be supplied to a control load. A supply system comprising: a rectifier circuit; a control power supply for stepping down an output of the rectifier circuit to a first voltage and applying the voltage to the control load; and an output of the rectifier circuit lower than the first voltage. A battery charger that converts the voltage to 2 and charges the secondary battery; one end is electrically connected to the output end side of the control power supply; the other end is electrically connected to the output end side of the battery charger. A unidirectional element connected in a direction to prevent current from the control power source from flowing into the secondary battery, a voltage detection unit for detecting a terminal voltage of the secondary battery, and a temperature for calculating an outside air temperature Calculater and previous Configured to include a control unit that performs an abnormality diagnosis of the secondary battery based on the calculated value of the detected value and the temperature calculation section of the voltage detection unit.

  According to the present invention, there is an effect that the progress of the life deterioration of the secondary battery can be appropriately suppressed.

FIG. 3 is a block diagram showing a configuration example of the power supply system according to the first embodiment. The flowchart explaining the control flow at the time of operating an electric power source disconnection apparatus in the electric power supply system which concerns on Embodiment 1. FIG. The figure which shows the relationship between a terminal open circuit voltage and a capacity | capacitance ratio at the time of using a lead storage battery as a secondary battery Flowchart for explaining a control flow relating to life deterioration diagnosis in the power supply system of the first embodiment FIG. 3 is a block diagram illustrating a configuration example of a power supply system according to a second embodiment. The flowchart explaining the control flow at the time of operating an electric power source disconnection apparatus in the electric power supply system which concerns on Embodiment 2. FIG. FIG. 4 is a block diagram showing a configuration example of a power supply system according to a third embodiment. The flowchart explaining the control flow at the time of operating an electric power source disconnection apparatus in the electric power supply system which concerns on Embodiment 3. FIG.

  Hereinafter, a power supply system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a block diagram illustrating a configuration example of the power supply system according to the first embodiment. As shown in FIG. 1, the power supply system 100 according to Embodiment 1 includes a main circuit 1 and a secondary battery 2 as a backup power source as main components. The AC power supplied from the AC power supply 50 is supplied to the home load 60 without passing through the main circuit 1, and is also supplied to the main circuit 1. The main circuit 1 converts AC power supplied from the AC power supply 50 into DC power by the rectifier circuit 11 and supplies the DC power to the control load 18 that is a DC load. The secondary battery 2 supplies the output of the secondary battery 2 to the control load 18 when electric power is not supplied from the AC power supply 50 due to a failure of the AC power supply 50 or the like (hereinafter referred to as “power failure”).

  The main circuit 1 includes a power conversion unit 6 that converts power supplied from a power source 70 that is an external power source such as an EV (Electric Vehicle) into AC power, and power supplied from the AC power supply 50 or the power conversion unit 6. Power source disconnecting device 8 for disconnecting the circuit from the latter stage of the circuit, rectifying circuit 11 for rectifying the AC voltage applied through power source disconnecting device 8, and the output of rectifying circuit 11 is converted to first DC voltage Va. The control power supply 12 to be applied to the control load 18 and the battery charger for charging the secondary battery 2 with the second DC voltage Vb lower than the first DC voltage Va as the output of the rectifier circuit 11 (if necessary, “BCG 13), a voltage detection unit 14 that detects the terminal voltage of the secondary battery 2, a current sensor 15a that senses the charge / discharge current of the secondary battery 2, and the current output using the sensor output of the current sensor 15a. A current detection unit 15 comprising a current calculation unit 15b for calculating the temperature, a temperature calculation unit 21a for calculating the outside air temperature using the sensor output of the temperature sensor 21b, a control unit 16 for controlling on / off of the battery charger 13, and one end. A certain cathode is electrically connected to the output end side of the control power supply 12, and an anode which is the other end is electrically connected to the output end side of the battery charger 13, and current from the control power supply 12 flows into the secondary battery 2. And an isolation diode 17 connected in a direction to prevent this. Due to the presence of the separation diode 17, the secondary battery 2 is prevented from being charged by the output of the control power supply 12, and when power is supplied from at least one of the AC power supply 50 and the power source 70 (hereinafter referred to as “power supply”). In the case of “when no power failure occurs”, discharge from the secondary battery 2 to the control load 18 is prevented.

  Inside the control unit 16, a storage unit 16 a that holds a detection value detected by the voltage detection unit 14 and a calculation value calculated by the current detection unit 15 and the temperature calculation unit 21 a, and an operation time or accumulated usage of the secondary battery 2. And a timer 16b for accumulating time. The operating time or accumulated usage time accumulated by the timer 16b is held in the storage unit 16a. Among the above components, the components excluding the current sensor 15a are mounted on one or a plurality of substrates.

  A breaker 23 connected to the positive electrode side of the secondary battery 2 and switching whether or not the output of the secondary battery 2 is applied to the anode of the separation diode 17 is provided outside the main circuit 1, and the controller 16 will be described later. And an operation display unit 24 for instructing the life deterioration diagnosis to be performed and displaying the result of the life deterioration diagnosis.

  Next, operations of main parts in the main circuit unit of the power supply system according to Embodiment 1 will be described with reference to the drawings in FIGS. 1 and 2 as appropriate. In the following description, it is assumed that the AC power supply 50 is a system AC 200V. In addition, the power conversion unit 6 converts the DC output of the power source 70 into AC 200 V and applies it to the power source disconnecting device 8.

  When AC200V is applied to the rectifier circuit 11, the control power supply 12 and the battery charger 13 start operating. The control power supply 12 outputs a first DC voltage Va, and the battery charger 13 outputs a second DC voltage Vb. Here, the typical value of the first DC voltage Va output from the control power supply 12 is 28.4V, and the typical value of the second DC voltage Vb output from the battery charger 13 is 27.3V.

  When AC200V is supplied to the control power supply 12 and the battery charger 13, that is, when there is no power failure, the breaker 23 is controlled to be closed as shown in FIG. In this case, the second DC voltage Vb output from the battery charger 13 is applied to the positive electrode of the secondary battery 2 via the breaker 23. Here, the control unit 16 has a function of on / off controlling the output of the battery charger 13. Further, since the separation diode 17 is provided between the output terminal of the control power source 12 and the output terminal of the battery charger 13, the output power of the battery charger 13 is not supplied to the control load 18, and the secondary battery 2. The secondary battery 2 is prevented from being discharged by the output of the control power supply 12. When the secondary battery 2 is replaced or maintained, the breaker 23 is controlled to be open.

  As described above, when there is no power failure and the control power supply 12 and the battery charger 13 are operating normally (hereinafter referred to as “normal time” as necessary), the secondary battery 2 is in the charging mode. . In the charging mode, trickle charging is performed by the battery charger 13. On the other hand, at the time of a power failure, since the control power supply 12 and the battery charger 13 stop operating, current is discharged from the secondary battery 2 to the control load 18. By detecting this discharge current by the current detector 15, a power failure state can be detected.

  Next, a control flow according to the first embodiment for operating the power source disconnecting device 8 will be described. FIG. 2 is a flowchart for explaining a control flow when operating the power source disconnecting device 8 in the power supply system according to the first embodiment. In FIG. 2, the notation of the reference numerals attached to the components is omitted.

  First, the storage unit 16a of the control unit 16 is provided with a plurality of determination thresholds for overvoltage detection. In the flow of FIG. 2, two threshold values A and B are illustrated, but three or more threshold values may be used.

  The control unit 16 performs a first determination process for determining whether or not the voltage value detected by the voltage detection unit 14, that is, whether the terminal voltage of the secondary battery 2 is equal to or higher than the threshold A that is the first threshold (step S1). S101). When the terminal voltage of the secondary battery 2 is less than the threshold value A (No at Step S101), the process at Step S101 is repeated. When the terminal voltage of the secondary battery 2 is equal to or higher than the threshold A (Yes in step S101), it is further determined whether or not a time Ta that is the first settling time has elapsed when the terminal voltage is equal to or higher than the threshold A. A second determination process is performed (step S102). When the state in which the terminal voltage of the secondary battery 2 is equal to or higher than the threshold A has not elapsed the time Ta (No at Step S102), the process returns to Step S101. On the other hand, when the state in which the terminal voltage of the secondary battery 2 is equal to or higher than the threshold A has elapsed the time Ta (Yes in step S102), the abnormal Ea information, that is, the current state of the secondary battery 2 is “threshold. Information indicating that “the state of A or more has passed the time Ta” is stored in the storage unit 16a (step S103). In addition, although several minutes (for example, about 5 minutes) are illustrated as time Ta, of course, it is not limited to this number.

  The time Ta is changed according to the output value of the temperature calculation unit 21a, that is, the outside air temperature. Specifically, the value of time Ta is increased when the outside air temperature is low, and the value of time Ta is decreased when the outside air temperature is high.

  In addition to the control described above, that is, the change control of the time Ta, the value of the threshold A may be changed according to the outside air temperature. Specifically, the value of the threshold A is increased when the outside air temperature is low, and the value of the threshold A is decreased when the outside air temperature is high.

  In the two change controls described above, at least one of the time Ta and the threshold value A is changed according to the outside air temperature. Instead of or in addition to this control, the time Ta and the threshold value A are changed. At least one of them may be changed according to the life deterioration diagnosis result of the secondary battery 2. Although the control flow relating to the life deterioration diagnosis will be described later, the life deterioration diagnosis can be performed by the terminal open circuit voltage of the secondary battery 2. The “terminal open circuit voltage” is “terminal voltage of the secondary battery during natural discharge”. Further, “spontaneous discharge” means “a discharge state of the secondary battery when no load is connected to the secondary battery”.

  FIG. 3 is a diagram showing the relationship between the terminal open circuit voltage and the capacity ratio when a lead storage battery is used as the secondary battery. The relationship between the terminal open circuit voltage of the secondary battery 2 and the storage capacity of the secondary battery 2 (hereinafter referred to as “secondary battery capacity” or “battery capacity”) during natural discharge is known as illustrated in FIG. . In the example shown in FIG. 3, the terminal open circuit voltage when the capacity ratio is 100% is about 13 V, and the terminal open circuit voltage when the capacity ratio is 80% is about 12.75 (V). In the case where the secondary battery 2 is a lead storage battery, it is known that when the battery capacity falls below 80%, the battery capacity cannot be recovered to 100% even by subsequent charging, that is, the life is deteriorated. Therefore, the life deterioration diagnosis of the secondary battery 2 can be performed using the terminal open circuit voltage of the secondary battery 2 during natural discharge.

  Therefore, when the value of the terminal open circuit voltage of the secondary battery 2 is small, at least one value of the time Ta and the threshold A is decreased, and when the value of the terminal open circuit voltage is large, at least one of the time Ta and the threshold A is set. What is necessary is just to perform control to enlarge.

  In addition, it can be considered that the life deterioration of the secondary battery 2 is progressing as the accumulated usage time of the secondary battery 2 becomes longer. For this reason, it may replace with a lifetime deterioration diagnosis and may use the use accumulation time of the secondary battery 2. FIG. As described above, the accumulated usage time of the secondary battery 2 is accumulated by the timer 16b and held in the storage unit 16a.

  Returning to the control flow of FIG. The control unit 16 performs a third determination process for determining whether or not the terminal voltage of the secondary battery 2 is equal to or higher than a second threshold value B (B> A) (step S104). When the terminal voltage of the secondary battery 2 is less than the threshold value B (No at Step S104), the process at Step S104 is repeated. When the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value B (step S104, Yes), the time Tb (Tb <Ta) in which the terminal voltage is equal to or higher than the threshold value B is the second settling time has elapsed. A fourth determination process is performed to determine whether or not the process has been performed (step S105). When the state in which the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value B has not passed the time Tb (No at Step S105), the process returns to Step S104. On the other hand, when the state in which the terminal voltage of the secondary battery 2 is equal to or higher than the threshold B has passed the time Tb (Yes in step S105), the abnormal Eb information, that is, the current state of the secondary battery 2 is “threshold. Information indicating that “the state of B or more has passed the time Tb” is stored in the storage unit 16a (step S106). In addition, although several seconds (for example, about 5 to 10 seconds) are illustrated as time Tb, of course, it is not limited to this number.

  After holding the abnormal Eb information in the storage unit 16a, the control unit 16 stops the operation of the battery charger 13 (step S107). This process assumes that an overvoltage is applied due to a failure of the battery charger 13. After stopping the operation of the battery charger 13, the control unit 16 determines whether or not the time Tr, which is the third settling time, has elapsed since the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value B. 5 is performed (step S108). When the state in which the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value B has not elapsed the time Tr (No at Step S108), the process at Step S108 is repeated. On the other hand, when the time Tr has elapsed when the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value B (step S108, Yes), the abnormal Er information, that is, the current state of the secondary battery 2 is “threshold value. Information indicating that the state of B or more has passed the time Tr is stored in the storage unit 16a (step S109). In addition, although several seconds (for example, about 5-10 seconds) are illustrated as time Tr, of course, it is not limited to this number.

  After holding the abnormal Er information in the storage unit 16a, the control unit 16 operates the power source disconnecting device 8 (step S110), so that the power supplied from the AC power supply 50 or the power conversion unit 6 is supplied to the rectifier circuit 11. Do not apply. In this process, it is assumed that overvoltage is continuously applied due to a failure other than the battery charger 13 (other component failure or the like), and the power supplied from the AC power supply 50 or the power conversion unit 6 is converted to the rectifier circuit 11. It is the intention not to be applied to. The entire process is completed by the process of step S110.

  The life deterioration diagnosis for the secondary battery 2 can be executed by the control flow shown in FIG. FIG. 4 is a flowchart for explaining a control flow relating to the life deterioration diagnosis in the power supply system according to the first embodiment. In FIG. 4, first, the control unit 16 determines whether or not the discharge current from the secondary battery 2 is greater than or equal to the threshold value P (step S401). When the discharge current from the secondary battery 2 is equal to or greater than the threshold value P (step S401, Yes), the capacity deterioration rate with respect to time is large, and thus the life deterioration diagnosis is not performed. In such a state, due to the characteristics of the secondary battery that the battery capacity can be recovered to 100% by subsequent charging, the control unit 16 determines that the diagnosis of life deterioration is unnecessary (step S402), and the operation display. The unit 24 is notified that the diagnosis is unnecessary (step S403), and the processing flow ends. The operation display unit 24 displays that the diagnosis is unnecessary and notifies the user.

  Returning to the process of step S401, when the discharge current from the secondary battery 2 is less than the threshold value P (No in step S401), the control unit 16 further determines whether or not the secondary battery 2 has discharged a current equal to or greater than the threshold value P. Is determined (step S404). The storage unit 16a of the control unit 16 stores the detection values detected by the voltage detection unit 14 and the current detection unit 15 as a log, and can determine whether or not a discharge of current equal to or greater than the threshold value P has occurred.

  In step S404, when the secondary battery 2 does not discharge more than the threshold value P (No in step S404), the battery charger 13 is stopped (step S405), and the process proceeds to step S408. On the other hand, when the secondary battery 2 discharges more than the threshold value P (step S404, Yes), the control unit 16 further determines whether or not charging for the set time by the battery charger 13 is completed (step S406). ). When the charging for the set time is not completed (No at Step S406), the process at Step S406 is repeated. If charging for the set time is complete (step S406, Yes), the battery charger 13 is stopped (step S407), and the process proceeds to step S408.

  After the battery charger 13 stops, the control unit 16 controls the breaker 23 to be turned off, that is, to be opened (step S408). After controlling the breaker 23 to the open state, the control unit 16 proceeds to the process of step S409 for determining whether or not the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value Q.

  The control unit 16 determines whether or not the terminal voltage of the secondary battery 2 is equal to or higher than a threshold value Q that is a second threshold value (step S409). As described above, there is a capacity reduction diagnosis as one of the life deterioration diagnosis of the secondary battery 2. In the description using FIG. 3, when the battery capacity falls below 80%, it is determined that the secondary battery 2 is in a state in which the lifetime has deteriorated. The control flow in FIG. 4 uses this method, and as the threshold value Q, a terminal open circuit voltage corresponding to 80% of the battery capacity of the secondary battery 2 is set.

  Returning to the flow of FIG. 4, when the terminal voltage of the secondary battery 2 is less than the threshold value Q in step S409 (step S409, No), it is determined that the life of the secondary battery 2 has deteriorated (step S410). The display unit 24 is notified that the replacement is urged (step S411), the detected terminal voltage, that is, the terminal open circuit voltage is held in the storage unit 16a (step S412), and the processing flow ends. On the other hand, when the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value Q (step S409, Yes), it is determined that the life of the secondary battery 2 is normal (step S413), and the operation display unit 24 is normal. (Step S414), and the detected terminal voltage (terminal open circuit voltage) is held in the storage unit 16a (step S415). Thereafter, the breaker 23 is turned on, that is, controlled to be closed (step S416), and the operation of the battery charger 13 is resumed (step S417). With the processing in step S417, the entire processing flow ends.

  In step S408, controlling the breaker 23 to turn off is intended to place the secondary battery 2 in a spontaneous discharge state, but when the current flowing through the control load 18 is small even when the breaker 23 is on, It is not necessary to control the breaker 23 to be off. The terminal voltage of the secondary battery 2 when the current flowing through the control load 18 is small has a small difference from the terminal voltage of the secondary battery 2 at the time of natural discharge, that is, the terminal open circuit voltage of the secondary battery 2. The life deterioration diagnosis of the secondary battery 2 can be performed by using the terminal voltage of.

  As described above, according to the power supply system according to the first embodiment, the thresholds A and B (threshold A <threshold B) are provided as a plurality of thresholds for determining the abnormality of the secondary battery in stages. The secondary battery abnormality is judged step by step based on the terminal voltage of the secondary battery. For the threshold A and its settling time Ta, the outside air temperature, the secondary battery life deterioration diagnosis result, the use of the secondary battery By performing the control for correction according to the accumulated time, it is possible to appropriately suppress the progress of the life deterioration of the secondary battery. Moreover, by providing the threshold A smaller than the threshold B and the settling time Ta longer than the settling time Tb, the power supply system can be used safely and as long as possible, and the operating rate of the power supply system can be improved. It becomes possible.

Embodiment 2. FIG.
FIG. 5 is a block diagram illustrating a configuration example of the power supply system according to the second embodiment. The power supply system according to the first embodiment has the temperature sensor 21b for detecting the outside air temperature. However, in the second embodiment, the temperature of the secondary battery 2 itself or the temperature of the secondary battery 2 itself is estimated. A difference in configuration is that a temperature sensor 21c for detecting the ambient temperature of the possible secondary battery 2 is provided. In addition, about another structure, it is the same as that of Embodiment 1, or equivalent, About the same or equivalent component, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  Next, a control flow according to the second embodiment for operating the power source disconnecting device 8 will be described. FIG. 6 is a flowchart for explaining a control flow when operating the power source disconnecting device 8 in the power supply system according to the second embodiment. In FIG. 6, the notation of the reference numerals attached to the components is omitted.

  The storage unit 16a of the control unit 16 is provided with a plurality of determination threshold values for detecting an excessive temperature rise. In the flow of FIG. 6, two threshold values C and D are illustrated, but three or more threshold values may be used.

  The control unit 16 determines whether or not the temperature detected by the temperature sensor 21c and calculated by the temperature calculation unit 21a, that is, whether the temperature of the secondary battery 2 is equal to or higher than a threshold value C that is a first threshold value. Processing is performed (step S201). When the temperature of the secondary battery 2 is lower than the threshold value C (No at Step S201), the process at Step S201 is repeated. When the temperature of the secondary battery 2 is equal to or higher than the threshold value C (step S201, Yes), it is further determined whether or not the time Tc that is the first settling time has elapsed when the temperature is equal to or higher than the threshold value C. A second determination process is performed (step S202). If the state in which the temperature of the secondary battery 2 is equal to or higher than the threshold C has not elapsed the time Tc (No at Step S202), the process returns to Step S201. On the other hand, when the state where the temperature of the secondary battery 2 is equal to or higher than the threshold C has passed the time Tc (step S202, Yes), the output of the battery charger 13, that is, the charging voltage for the secondary battery 2 is lowered. (Step S203). This process assumes that there is a possibility that an overtemperature of the system or a failure of the secondary battery 2 has occurred, and reduces the damage given to the secondary battery 2 and controls the temperature of the secondary battery 2 to decrease. Is intended. As an example, the flow of FIG. 6 shows that the voltage is lowered from 27.3V to 26.8V, but is not limited to these values.

  After decreasing the charging voltage for the secondary battery 2, the control unit 16 indicates that the abnormal Ec information, that is, the current temperature of the secondary battery 2 is “the state in which the temperature is equal to or higher than the threshold C has passed the time Tc”. Information is held in the storage unit 16a (step S204). In addition, although several minutes (for example, about 5 minutes) are illustrated as time Tc, of course, it is not limited to this number.

  The time Tc is changed according to the life deterioration diagnosis result of the secondary battery 2. Specifically, when the value of the terminal open circuit voltage of the secondary battery 2 is large, the value of the time Tc is increased, and when the value of the terminal open circuit voltage of the secondary battery 2 is small, the value of the time Tc is decreased.

  In addition to the above-described control, that is, control for changing the time Tc, the value of the threshold C may be changed according to the life deterioration diagnosis result. Specifically, the value of the threshold C is increased when the value of the terminal open circuit voltage of the secondary battery 2 is large, and the value of the threshold C is decreased when the value of the terminal open circuit voltage is small.

  Further, similarly to the first embodiment, the accumulated usage time of the secondary battery 2 may be used instead of the life deterioration diagnosis. Specifically, at least one value of the time Tc and the threshold value C is increased when the value of the usage cumulative time of the secondary battery 2 is small, and when the value of the cumulative usage time is large, the value of the time Tc and the threshold value C is increased. Control is performed to reduce at least one value.

  Returning to the control flow of FIG. The control unit 16 performs a third determination process for determining whether or not the temperature of the secondary battery 2 is equal to or higher than a second threshold value D (D> C) (step S205). When the temperature of the secondary battery 2 is less than the threshold value D (step S205, No), the process of step S205 is repeated. If the temperature of the secondary battery 2 is equal to or higher than the threshold value D (step S205, Yes), whether the time Td (Td <Tc) when the temperature is equal to or higher than the threshold value D is the second settling time has elapsed A fourth determination process is performed to determine whether or not (step S206). When the state in which the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value D has not passed the time Td (No at Step S206), the process returns to Step S205. On the other hand, when the state in which the terminal voltage of the secondary battery 2 is equal to or higher than the threshold D has passed the time Td (Yes in step S206), the abnormal Ed information, that is, the current state of the secondary battery 2 is “threshold. The storage unit 16a holds information indicating that the time Td has elapsed since the time Td has passed (T207). In addition, although several seconds (for example, about 5-10 seconds) are illustrated as time Td, of course, it is not limited to this number.

  After holding the abnormal Ed information in the storage unit 16a, the control unit 16 stops the operation of the battery charger 13 (step S208). This process assumes that there is a possibility that a system overheating or a failure of the secondary battery 2 may have occurred due to the failure of the battery charger 13. After stopping the operation of the battery charger 13, the control unit 16 determines whether or not a time Ts that is a third settling time has elapsed since the temperature of the secondary battery 2 is equal to or higher than the threshold value D. The determination process is performed (step S209). When the state in which the temperature of the secondary battery 2 is equal to or higher than the threshold value D has not passed the time Ts (step S209, No), the process of step S209 is repeated. On the other hand, when the state in which the temperature of the secondary battery 2 is equal to or higher than the threshold D has passed the time Ts (Yes in step S209), the abnormal Es information, that is, the current state of the secondary battery 2 is “threshold D. Information indicating that the above state has passed the time Ts is stored in the storage unit 16a (step S210). In addition, although several seconds (for example, about 5 to 10 seconds) are illustrated as time Ts, of course, it is not limited to this number.

  After holding the abnormal Es information in the storage unit 16a, the control unit 16 operates the power source disconnecting device 8 (step S211), so that the power supplied from the AC power supply 50 or the power conversion unit 6 is supplied to the rectifier circuit 11. Do not apply. This process is intended to prevent the power supplied from the AC power supply 50 or the power converter 6 from being applied to the rectifier circuit 11 on the assumption that the system overheating continues. The entire process is completed by the process of step S211.

  As described above, according to the power supply system according to the second embodiment, the thresholds C and D (threshold C <threshold D) are provided as a plurality of thresholds for determining the abnormality of the secondary battery in stages. Based on the terminal voltage of the secondary battery and the temperature of the secondary battery, the abnormality of the secondary battery is determined in stages, and for the threshold C and its settling time Tc, the secondary battery life deterioration diagnosis result, the secondary battery By performing control for correction according to the accumulated usage time of the battery, it is possible to appropriately suppress the progress of the life deterioration of the secondary battery. Moreover, by providing the threshold C smaller than the threshold D and the settling time Tc longer than the settling time Td, the power supply system can be used safely and as long as possible, and the operating rate of the power supply system can be improved. It becomes possible.

Embodiment 3 FIG.
FIG. 7 is a block diagram illustrating a configuration example of the power supply system according to the third embodiment. In the power supply system according to Embodiment 2, the temperature calculation unit 21a and the temperature sensor 21c for calculating the temperature of the secondary battery 2 itself or the ambient temperature of the secondary battery 2 capable of estimating the temperature of the secondary battery 2 itself are provided. However, in the third embodiment, instead of the configuration having the temperature calculation unit 21a and the temperature sensor 21c, the secondary battery 2 is detected using the detection values of the hydrogen sulfide sensor 22b and the hydrogen sulfide sensor 22b that sense hydrogen sulfide. It is a structural difference that a concentration calculation unit 22a that calculates the concentration of hydrogen sulfide (hereinafter simply referred to as “hydrogen sulfide concentration”) is provided. In addition, about another structure, it is the same as that of Embodiment 2, or equivalent, About the same or equivalent component, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  Next, a control flow according to Embodiment 3 for operating the power source disconnecting device 8 will be described. FIG. 8 is a flowchart for explaining a control flow when operating the power source disconnecting device 8 in the power supply system of the third embodiment. In FIG. 8, the notation of the reference numerals attached to the constituent parts is omitted.

  The storage unit 16a of the control unit 16 is provided with a plurality of determination thresholds for detecting an excessive concentration. In the flow of FIG. 8, two threshold values of threshold value E and threshold value F are illustrated, but three or more threshold values may be used.

  The control unit 16 performs a first determination process for determining whether or not the concentration of hydrogen sulfide detected by the hydrogen sulfide sensor 22b and calculated by the concentration calculation unit 22a is equal to or higher than the first threshold value E (step S1). S301). If the concentration of hydrogen sulfide is less than the threshold value E (No at Step S301), the process at Step S301 is repeated. When the concentration of hydrogen sulfide is equal to or higher than the threshold E (step S301, Yes), a second determination is made as to whether or not a time Te that is the first settling time has elapsed when the concentration is equal to or higher than the threshold E. The determination process is performed (step S302). When the state in which the concentration of hydrogen sulfide is equal to or higher than the threshold value E has not elapsed time Te (step S302, No), the process returns to step S301. On the other hand, when the state in which the hydrogen sulfide concentration is equal to or higher than the threshold value E has elapsed time Te (step S302, Yes), the output of the battery charger 13, that is, the charging voltage for the secondary battery 2 is decreased (step S302). S303). This process assumes that there is a possibility that an overtemperature of the system or a failure of the secondary battery 2 has occurred, and reduces the damage given to the secondary battery 2 and controls the temperature of the secondary battery 2 to decrease. Is intended. As an example, the flow of FIG. 8 shows that the voltage is lowered from 27.3V to 26.8V, but is not limited to these values.

  The controller 16 drops the charging voltage for the secondary battery 2, and then abnormal Ee information, that is, the state where the current hydrogen sulfide concentration of the secondary battery 2 is “threshold E or more has elapsed time Te. Is stored in the storage unit 16a (step S304). In addition, although several minutes (for example, about 5 minutes) are illustrated as time Te, of course, it is not limited to this number.

  Further, the time Te is changed according to the life deterioration diagnosis result of the secondary battery 2. Specifically, when the value of the terminal open circuit voltage of the secondary battery 2 is large, the value of the time Te is increased, and when the value of the terminal open circuit voltage of the secondary battery 2 is small, the value of the time Te is decreased.

  In addition to the control described above, that is, the change control of the time Te, the value of the threshold value E may be changed according to the life deterioration diagnosis result. Specifically, the value of the threshold E is increased when the value of the terminal open circuit voltage of the secondary battery 2 is large, and the value of the threshold E is decreased when the value of the terminal open circuit voltage is small.

  Further, as in the first and second embodiments, the accumulated usage time of the secondary battery 2 may be used instead of the life deterioration diagnosis. Specifically, when the value of the accumulated usage time of the secondary battery 2 is small, at least one value of the time Te and the threshold value E is increased, and when the value of the accumulated usage time is large, the value of the time Te and the threshold value E is increased. Control is performed to reduce at least one value.

  Returning to the control flow of FIG. The control unit 16 performs a third determination process for determining whether or not the concentration of hydrogen sulfide is equal to or higher than a second threshold value F (F> E) (step S305). When the concentration of hydrogen sulfide is less than the threshold value F (No at Step S305), the process at Step S305 is repeated. If the hydrogen sulfide concentration is equal to or higher than the threshold value F (step S305, Yes), whether or not the time Tf (Tf <Te), which is the second settling time when the concentration is equal to or higher than the threshold value F, has elapsed. A fourth determination process is performed to determine (step S306). When the state in which the terminal voltage of the secondary battery 2 is equal to or higher than the threshold F has not elapsed the time Tf (No at Step S306), the process returns to Step S305. On the other hand, when the time Tf has passed since the terminal voltage of the secondary battery 2 is equal to or higher than the threshold value F (step S306, Yes), abnormal Ef information, that is, the current hydrogen sulfide concentration of the secondary battery 2 Is stored in the storage unit 16a in the storage unit 16a (step S307). In addition, although several seconds (for example, about 5 to 10 seconds) are illustrated as time Tf, of course, it is not limited to this number.

  After holding the abnormality Ef information in the storage unit 16a, the control unit 16 stops the operation of the battery charger 13 (step S308). This process assumes that the concentration of hydrogen sulfide has increased due to the failure of the battery charger 13 and that there has been a possibility that an overtemperature of the system or a failure of the secondary battery 2 has occurred. After stopping the operation of the battery charger 13, the control unit 16 determines whether or not the state where the hydrogen sulfide concentration is equal to or higher than the threshold value F has passed the time Tu that is the third settling time. Processing is performed (step S309). When the state in which the concentration of hydrogen sulfide is equal to or higher than the threshold value F has not elapsed time Tu (step S309, No), the process of step S309 is repeated. On the other hand, when the state where the hydrogen sulfide concentration is equal to or higher than the threshold value F has passed the time Tu (step S309, Yes), the abnormal Eu information, that is, the current hydrogen sulfide concentration of the secondary battery 2 is “threshold value”. Information indicating that “the state of F or more has passed the time Tu” is stored in the storage unit 16a (step S310). In addition, although several seconds (for example, about 5 to 10 seconds) are illustrated as time Tu, of course, it is not limited to this number.

  After holding the abnormal Eu information in the storage unit 16a, the control unit 16 operates the power source disconnecting device 8 (step S311) so that the power supplied from the AC power supply 50 or the power conversion unit 6 is supplied to the rectifier circuit 11. Do not apply. This process assumes that the system temperature has continued to rise due to the detection of the hydrogen sulfide concentration increase, so that the power supplied from the AC power supply 50 or the power converter 6 is not applied to the rectifier circuit 11. Is intended. The entire process is terminated by the process of step S311.

  As described above, according to the power supply system according to the third embodiment, the thresholds E and F (threshold E <threshold F) are provided as the plurality of thresholds for determining the abnormality of the secondary battery in stages. Based on the terminal voltage of the secondary battery and the hydrogen sulfide concentration in the secondary battery, the abnormality of the secondary battery is determined in stages, and for the threshold value E and its settling time Te, the results of life deterioration diagnosis of the secondary battery, By performing the control for correction according to the accumulated usage time of the secondary battery, it is possible to appropriately suppress the progress of the life deterioration of the secondary battery. Moreover, by providing the threshold E smaller than the threshold F and the settling time Te longer than the settling time Tf, the power supply system can be used safely and as long as possible, and the operating rate of the power supply system can be improved. It becomes possible.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  DESCRIPTION OF SYMBOLS 1 Main circuit, 2 Secondary battery, 6 Power conversion part, 8 Power source disconnection apparatus, 11 Rectifier circuit, 12 Control power supply, 13 Battery charger (BCG), 14 Voltage detection part, 15 Current detection part, 15a Current sensor, 15b Current calculation unit, 16 control unit, 16a storage unit, 16b timer, 17 separation diode, 18 control load, 21a temperature calculation unit, 21b, 21c temperature sensor, 22a concentration calculation unit, 22b hydrogen sulfide sensor, 23 breaker, 24 operation display Part, 50 AC power supply, 60 residential load, 70 power source, 100 power supply system.

Claims (8)

A power supply system that includes a secondary battery for backup, converts AC power supplied from an AC power source to DC power, and supplies the load to a load.
A rectifier circuit for rectifying the output of the AC power supply;
A control power supply for stepping down the output of the rectifier circuit to a first voltage and applying it to the load;
A battery charger that converts the output of the rectifier circuit into a second voltage lower than the first voltage to charge the secondary battery;
One end is electrically connected to the output end side of the step-down power supply, and the other end is electrically connected to the output end side of the battery charger, and prevents current from the control power source from flowing into the secondary battery. A unidirectional element connected in an orientation;
A voltage detector for detecting a terminal voltage of the secondary battery;
A current detector for detecting a current flowing in the secondary battery;
A temperature calculation unit for calculating the outside air temperature;
A control unit that determines stepwise the abnormality of the secondary battery based on the detection value of the voltage detection unit, and changes a threshold value when stepwise determining the abnormality of the secondary battery;
Power supply system with The controller is
A first determination process for determining whether a terminal voltage of the secondary battery detected by the voltage detection unit is equal to or higher than a first threshold;
A second determination process for determining whether or not a first settling time has elapsed for a state equal to or greater than the first threshold;
A third determination process for determining whether the terminal voltage of the secondary battery detected by the voltage detection unit is equal to or greater than a second threshold value that is greater than the first threshold value;
A fourth determination process for determining whether a second settling time smaller than a value of the first settling time has elapsed in a state that is equal to or greater than the second threshold;
A fifth determination process for stopping the operation of the battery charger and determining whether or not a third settling time has elapsed in a state that is equal to or greater than the second threshold;
And when it is determined by the fifth determination process that the state equal to or greater than the second threshold has passed the third settling time, the power supplied from the AC power supply is not applied to the rectifier circuit. The power supply system according to claim 1.   3. The power supply system according to claim 2, wherein the first threshold value is corrected using at least one of the outside air temperature, a life deterioration diagnosis result of the secondary battery, and an accumulated use time of the secondary battery. A power supply system that includes a secondary battery for backup, converts AC power supplied from an AC power source to DC power, and supplies the load to a load.
A rectifier circuit for rectifying the output of the AC power supply;
A control power supply for stepping down the output of the rectifier circuit to a first voltage and applying it to the load;
A battery charger that converts the output of the rectifier circuit into a second voltage lower than the first voltage to charge the secondary battery;
One end is electrically connected to the output end side of the step-down power supply, and the other end is electrically connected to the output end side of the battery charger, and prevents current from the control power source from flowing into the secondary battery. A unidirectional element connected in an orientation;
A voltage detector for detecting a terminal voltage of the secondary battery;
A current detector for detecting a current flowing in the secondary battery;
A temperature calculation unit for calculating the temperature of the secondary battery;
Control for determining stepwise the abnormality of the secondary battery based on the detection value of the voltage detection unit and the calculated value of the temperature calculation unit, and changing the threshold value when stepwise determining the abnormality of the secondary battery And
Power supply system with The controller is
A first determination process for determining whether the temperature of the secondary battery calculated by the temperature calculation unit is equal to or higher than a first threshold;
A second determination process for determining whether or not a first settling time has elapsed for a state equal to or greater than the first threshold;
A third determination process for determining whether the temperature of the secondary battery calculated by the temperature calculation unit is equal to or higher than a second threshold value that is greater than the first threshold value;
A fourth determination process for determining whether a second settling time smaller than a value of the first settling time has elapsed in a state that is equal to or greater than the second threshold;
A fifth determination process for stopping the operation of the battery charger and determining whether or not a third settling time has elapsed in a state that is equal to or greater than the second threshold;
And when it is determined by the fifth determination process that the state equal to or greater than the second threshold has passed the third settling time, the power supplied from the AC power supply is not applied to the rectifier circuit. The power supply system according to claim 4. A power supply system that includes a secondary battery for backup, converts AC power supplied from an AC power source to DC power, and supplies the load to a load.
A rectifier circuit for rectifying the output of the AC power supply;
A control power supply for stepping down the output of the rectifier circuit to a first voltage and applying it to the load;
A battery charger that converts the output of the rectifier circuit into a second voltage lower than the first voltage to charge the secondary battery;
One end is electrically connected to the output end side of the step-down power supply, and the other end is electrically connected to the output end side of the battery charger, and prevents current from the control power source from flowing into the secondary battery. A unidirectional element connected in an orientation;
A voltage detector for detecting a terminal voltage of the secondary battery;
A current detector for detecting a current flowing in the secondary battery;
A concentration calculator that calculates the concentration of hydrogen sulfide in the secondary battery;
Control for determining stepwise the abnormality of the secondary battery based on the detection value of the voltage detection unit and the calculated value of the concentration calculation unit, and changing a threshold value when determining the abnormality of the secondary battery stepwise And
Power supply system with The controller is
A first determination process for determining whether or not the concentration of the hydrogen sulfide calculated by the concentration calculation unit is equal to or higher than a first threshold;
A second determination process for determining whether or not a first settling time has elapsed for a state equal to or greater than the first threshold;
A third determination process for determining whether the concentration of the hydrogen sulfide calculated by the concentration calculation unit is equal to or greater than a second threshold value that is greater than the first threshold value;
A fourth determination process for determining whether a second settling time smaller than a value of the first settling time has elapsed in a state that is equal to or greater than the second threshold;
A fifth determination process for stopping the operation of the battery charger and determining whether or not a third settling time has elapsed in a state that is equal to or greater than the second threshold;
And when it is determined by the fifth determination process that the state equal to or greater than the second threshold has passed the third settling time, the power supplied from the AC power supply is not applied to the rectifier circuit. The power supply system according to claim 6.   The power supply system according to claim 5 or 7, wherein the first threshold value is corrected using at least one of a life deterioration diagnosis result of the secondary battery and an accumulated usage time of the secondary battery.

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