WO2011040411A1 - 電圧監視装置 - Google Patents
電圧監視装置 Download PDFInfo
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- WO2011040411A1 WO2011040411A1 PCT/JP2010/066850 JP2010066850W WO2011040411A1 WO 2011040411 A1 WO2011040411 A1 WO 2011040411A1 JP 2010066850 W JP2010066850 W JP 2010066850W WO 2011040411 A1 WO2011040411 A1 WO 2011040411A1
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- voltage
- threshold
- threshold value
- monitoring
- battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
Definitions
- the present invention relates to a battery voltage monitoring device.
- Patent Literature 1 has proposed a battery control device having a function of detecting a spontaneous change in a threshold for battery overcharge detection or overdischarge detection. Specifically, the configuration disclosed in Patent Document 1 detects the voltage of a battery and compares the detected voltage with a threshold value.
- This configuration forcibly shifts the threshold value from the original value by a fixed value when comparing the battery voltage with the threshold value. That is, the threshold value is switched by one level.
- the battery control device determines that the spontaneous change in the threshold is large when the magnitude relationship between the threshold and the battery voltage does not reverse despite the forced change of the threshold. In this way, the threshold characteristic deviation can be detected.
- an object of the present invention is to provide a voltage monitoring device capable of improving the reliability of determination of threshold characteristic deviation.
- a voltage monitoring device for monitoring a battery voltage based on a monitoring threshold and diagnosing the monitoring threshold based on first and second diagnostic thresholds, A first means for obtaining a first relative relationship between the battery voltage and the monitoring threshold or the first diagnosis threshold, and outputting first information representing the obtained first relative relationship; A second means for obtaining a second relative relationship between the battery voltage and the monitoring threshold or the second diagnostic threshold, and outputting second information representing the obtained second relative relationship;
- the threshold used by the first means is switched to the monitoring threshold, and the threshold used by the second comparing means is switched to the monitoring threshold, and when performing the diagnosis, the first Threshold switching means for switching the threshold used in the means to the first diagnostic threshold and switching the threshold used in the second means to the second diagnostic threshold having the same value as the first diagnostic threshold;
- the first information output from the first means and the first information output from the second means after the first diagnosis threshold value and the second diagnosis threshold value are switched to the same value by the threshold value switching means.
- the threshold value switching means at the time of diagnosis, respectively. Since a dual system for comparing the first and second information of each other is configured, if there is no threshold characteristic deviation in any of the first and second means, the first and second information If the characteristic deviation occurs, “1 and the second information are different. That is, the first means and the second means are detected by detecting that the first information and the second information are different. Therefore, it is possible to detect the occurrence of the threshold characteristic deviation, and it is possible to improve the reliability of the threshold characteristic deviation determination.
- the invention according to claim 2 is characterized in that the threshold switching means switches the first diagnosis threshold and the second diagnosis threshold in a plurality of stages.
- each diagnosis threshold can be compared with the battery voltage in each of the plurality of stages of each diagnosis threshold. That is, even when the threshold value is switched in one step, the magnitude relationship between the threshold value and the battery voltage is not reversed. A comparison result in which the magnitude relationship between the battery voltage and the battery voltage is reversed is obtained, and a comparison result that is not reversed is obtained on the other hand. Therefore, it is possible to improve the determination accuracy of the threshold characteristic deviation.
- the threshold value when the battery voltage is not fluctuating, the threshold value can be changed stepwise with respect to the constant voltage of the battery, so that the magnitude relationship between the threshold value and the battery voltage can be reversed.
- the battery voltage does not fluctuate, it is possible to improve the determination accuracy of the threshold characteristic deviation.
- the abnormality detection means is configured such that the first information of the first means and the second information of the second means are continuously different from each other in two or more of a plurality of stages. , Detecting that an abnormality has occurred in the monitoring threshold value.
- the abnormality is detected by determining that the first and second information are continuously different, erroneous determination can be prevented. Therefore, it is possible to improve the determination accuracy of the threshold characteristic deviation.
- the first means includes a first voltage dividing means for outputting a voltage corresponding to the monitoring threshold value or the first diagnosis threshold value as a voltage divided voltage of the battery, and a first reference voltage.
- a first reference voltage source that outputs Receiving the divided voltage of the first voltage dividing means and the first reference voltage of the first reference voltage source, respectively, and comparing the divided voltage of the first voltage dividing means and the first reference voltage of the first reference voltage source;
- a first comparator that outputs a result as the first information
- the second means comprises: A second voltage dividing means for outputting a voltage corresponding to the monitoring threshold or the second diagnostic threshold as a divided voltage of the battery voltage;
- a second reference voltage source that outputs a second reference voltage that is the same as the first reference voltage;
- the divided voltage of the second voltage dividing means and the second reference voltage of the second reference voltage source are inputted, respectively, and the divided voltage of the second voltage dividing means and the second reference voltage of the second reference voltage source are inputted.
- the threshold value switching means switches the threshold value used in the first means to the first diagnosis threshold value by switching the voltage dividing ratio of the first voltage dividing means and the voltage dividing ratio of the second voltage dividing means, 4.
- the voltage monitoring apparatus according to claim 1, wherein a threshold value used in the second means is switched to the second diagnosis threshold value.
- the invention according to claim 5 is characterized in that the first diagnosis threshold and the second diagnosis threshold are set within a voltage range used in the battery.
- the first diagnosis threshold value and the second diagnosis threshold value need not be switched over the entire range from the minimum value to the maximum value of the battery voltage.
- the first means is: First voltage dividing means for dividing a reference voltage and outputting a divided voltage corresponding to the monitoring threshold or the first diagnosis threshold; A first comparator that receives the divided voltage of the first voltage dividing means and the power supply voltage, compares the divided voltage with the power supply voltage, and outputs the comparison result as the first information; Prepared, The second means includes Second voltage dividing means for dividing the reference voltage and outputting a divided voltage corresponding to the monitoring threshold or the second diagnostic threshold; A second comparator that receives the divided voltage of the second voltage dividing means and the power supply voltage, compares the divided voltage with the power supply voltage, and outputs the comparison result as the second information; Prepared, The threshold value switching means switches the threshold value used in the first means to the first diagnosis threshold value by switching the voltage dividing ratio of the first voltage dividing means and the voltage dividing ratio of the second voltage dividing means, And the threshold value used by said 2 means is switched to said 2nd diagnostic threshold value.
- each of the first and second means By configuring each of the first and second means in this way, the relative relationship between the battery voltage and the divided voltage corresponding to the threshold value is output as a comparison result between the battery voltage and the threshold value. be able to.
- FIG. 1 is an overall configuration diagram of a voltage monitoring system including a voltage monitoring device according to an embodiment of the present invention. It is a timing chart of the input / output of the first comparator and the second comparator when there is no threshold characteristic deviation between the first switching unit and the second switching unit. It is a timing chart of the input / output of the first comparator and the second comparator when there is a threshold characteristic deviation between the first switching unit and the second switching unit. It is a figure which shows a part of structure of the voltage monitoring system containing the voltage monitoring apparatus which concerns on the modification of embodiment of this invention.
- FIG. 1 is an overall configuration diagram of a voltage monitoring system including a voltage monitoring apparatus according to an embodiment of the present invention.
- the voltage monitoring system includes a battery 10 and a voltage monitoring device 20.
- the battery 10 is a voltage source that can generate a constant voltage.
- the battery 10 is used, for example, as a power source for driving a load or a power source for an electronic device.
- a primary battery that cannot be charged or a secondary battery that can be charged is employed.
- a lithium ion secondary battery is used as the battery 10.
- the voltage monitoring device 20 has an overcharge / discharge detection function for detecting overcharge and overdischarge of the battery 10 which is a secondary battery, and a self-diagnosis function for diagnosing a characteristic deviation of threshold values of the overcharge / discharge detection. I have it.
- the overcharge / discharge detection function is a function of monitoring the voltage of the battery 10 by comparing the voltage of the battery 10 with a specified value (threshold value).
- the voltage monitoring device 20 monitors whether the voltage of the battery 10 is between a specified value (threshold value) for detecting overcharge and a specified value (threshold value) for detecting overdischarge. It becomes.
- the self-diagnosis function is a function for detecting that the threshold value for detecting overcharge / discharge has changed for some reason (for example, a circuit failure or the like).
- the self-diagnostic function uses the diagnostic threshold for diagnosing whether there is an abnormality in the threshold for detecting overcharge / discharge, and abnormality (failure, disturbance, etc.) of each part that realizes the overcharge / discharge detection function It is a function to detect.
- Such a voltage monitoring device 20 includes a monitoring circuit unit 30 and a microcomputer 40.
- the monitoring circuit unit 30 includes a first monitoring circuit 50 and a second monitoring circuit 60, and the first monitoring circuit 50 and the second monitoring circuit 60 constitute a dual circuit. That is, the first monitoring circuit 50 and the second monitoring circuit 60 have the same circuit configuration.
- the monitoring circuit unit 30 is configured as an IC, for example.
- the first monitoring circuit 50 compares the threshold value with the voltage of the battery 10 and outputs the comparison result, and includes a first switching unit 51, a first reference voltage source 52, and a first comparator 53. .
- the first switching unit 51 generates a threshold voltage corresponding to the threshold from the voltage of the battery 10. Therefore, the first switching unit 51 is connected between the first wiring 31 electrically connected to the positive voltage of the battery 10 and the second wiring 32 electrically connected to the negative voltage of the battery 10. ing.
- the first switching unit 51 includes a plurality of resistors 55 and a plurality of switches 56 in order to generate a threshold voltage that is a threshold value.
- the plurality of resistors 55 are connected in series between the first wiring 31 and the second wiring 32.
- Each switch 56 is constituted by, for example, a resistance element or a transistor, and has an input terminal and an output terminal. Each switch 56 is turned on and off by control, and current conduction and blocking between the input terminal and the output terminal are enabled.
- the number of switches 56 is set to be one less than the number of resistors 55.
- a connection point is provided between the resistors 55 of each adjacent pair, and an input terminal of the switch 56 is connected to each connection point.
- the plurality of switches 56 are connected in parallel to each other.
- the output terminals of the switches 56 are connected in common to each other and connected to the non-inverting input terminal (+ terminal) of the first comparator 53.
- each of the ten switches 56a1 to a10 is connected to a connection point of a corresponding pair of resistors 55.
- the switch 56a10 located closest to the second wiring 32 in each resistor 55 is a switch 56 for performing overcharge detection.
- the switch 56a1 located closest to the first wiring 31 among the switches 56 is a resistor for performing overdischarge detection.
- the voltage of the battery 10 is divided by each resistor 55, and this divided voltage is input to the non-inverting input terminal of the first comparator 53 as a threshold voltage. Is done. Therefore, when the switch 56 closest to the first wiring 31 among the switches 56 is turned on, there are one resistance 55 connected to the first wiring 31 and ten resistances 55 connected to the second wiring 32.
- the partial pressure is input to the first comparator 53 as an overdischarge detection threshold, that is, a threshold voltage.
- the first switching unit 51 uses the divided voltage corresponding to any one of the overcharge detection threshold value, the first threshold value to the eighth threshold value, and the overdischarge detection threshold value as the threshold voltage. To the first comparator 53.
- overcharge detection threshold values, the first threshold value to the eighth threshold value, and the overdischarge detection threshold value are set within the voltage range of the battery 10.
- the overdischarge detection threshold is set to 4.25V, for example, and the overcharge detection threshold is set to 1.75V, for example. Therefore, the first threshold value to the eighth threshold value between the overcharge detection threshold value and the overdischarge detection threshold value are set in the usage range of the battery 10, and are set between 1.75V and 4.25V, for example.
- each of the first threshold value to the eighth threshold value is used for the voltage monitoring device 20 to perform self-diagnosis for detecting a threshold characteristic deviation.
- Each threshold value from the first threshold value to the eighth threshold value is set so that a constant value changes stepwise. For example, if the constant value is 0.1 V, each threshold value is set so that the difference between the first threshold value and the second threshold value is 0.1 V, and the difference between the second threshold value and the third threshold value is 0.1 V. ing.
- the resistance values of the resistors 55a1 to 55a11 are determined so that each threshold value changes stepwise at a constant value.
- the self-diagnosis is switched in stages from the largest first threshold value to the smallest eighth threshold value.
- the first threshold value to the eighth threshold value are set within the voltage range used in the battery 10, and are switched stepwise within the voltage range. By setting each threshold in this way, it is not necessary to switch the diagnosis threshold in stages for the entire range from the minimum value to the maximum value of the voltage of the battery 10.
- the first reference voltage source 52 is a voltage source that generates a constant first reference voltage.
- the first reference voltage source 52 is connected between the inverting input terminal ( ⁇ terminal) of the first comparator 53 and the second wiring 32.
- the first comparator 53 has the non-inverting input terminal, the inverting input terminal, and the output terminal.
- the first comparator 53 outputs these comparison results as the first output from the output terminal. It is supposed to be.
- a comparator can be used as such a comparator.
- the first reference voltage is input to the inverting input terminal of the first comparator 53, and the threshold voltage is input to the non-inverting input terminal. Therefore, when the threshold voltage is higher than the first reference voltage, the first output becomes a high level signal, and when the threshold voltage is lower than the first reference voltage, the first output becomes a low level signal.
- the second monitoring circuit 60 constitutes a dual system circuit together with the first monitoring circuit 50.
- the circuit configuration of the second monitoring circuit 60 is the same as the circuit configuration of the first monitoring circuit 50. That is, the second monitoring circuit 60 compares the threshold value with the voltage of the battery 10 and outputs the comparison result, and includes a second switching unit 61, a second reference voltage source 62, and a second comparator 63. ing.
- the second switching unit 61 Similar to the first switching unit 51, the second switching unit 61 generates a threshold voltage corresponding to a threshold from the voltage of the battery 10, and is connected between the first wiring 31 and the second wiring 32. Yes.
- the second switching unit 61 has the same configuration as the first switching unit 51 and includes a plurality of resistors 65a1 to 65a11 and a plurality of switches 66a1 to 66a10.
- connection form of the plurality of resistors 65a1 to 65a11 and the plurality of switches 66a1 to 66a10 is the same as the connection form of the resistors 55a1 to 55a11 and the switches 56a1 to 56a10.
- the output terminals of the switches 66 are connected in common with each other and connected to the non-inverting input terminal (+ terminal) of the second comparator 63.
- the configuration of the switch 66 is the same as that of the switch 56 of the first switching unit 51.
- the overcharge detection threshold, the first threshold value to the eighth threshold value, and the overdischarge detection threshold value in the second switching unit 61 are set to the same values as the threshold values of the first switching unit 51. Then, when each switch 66 is switched, the divided voltage corresponding to any one of the overcharge detection threshold value, the first threshold value to the eighth threshold value, and the overdischarge detection threshold value is set as the threshold voltage from the second switching unit 61 to 2 is output to the comparator 63.
- the second reference voltage source 62 is a voltage source that generates a constant second reference voltage.
- the second reference voltage generated by the second reference voltage source 62 is a voltage having the same value as the first reference voltage generated by the first reference voltage source 52.
- Such a second reference voltage source 62 is connected between the inverting input terminal ( ⁇ terminal) of the second comparator 63 and the second wiring 32.
- the second comparator 63 receives the threshold voltage from the second switching unit 61 and the second reference voltage from the second reference voltage source 62, and outputs the comparison result as a second output from the output terminal. is there. As such a second comparator 63, a comparator is used similarly to the first comparator 53.
- the second reference voltage is input from the second reference voltage source 62 to the inverting input terminal of the second comparator 63, and the threshold voltage is input from the second switching unit 61 to the non-inverting input terminal.
- the threshold voltage is larger than the second reference voltage, the second output becomes a high level signal, and when the threshold voltage is smaller than the second reference voltage, the second output becomes a low level signal.
- the first monitoring circuit 50 and the second monitoring circuit 60 have the same configuration. That is, it can be said that the monitoring circuit unit 30 includes a dual circuit.
- the microcomputer 40 includes a clock, a CPU, a ROM, an EEPROM, a RAM, and the like (not shown).
- the clock generates a periodic continuous pulse as a clock signal.
- CPU Each instruction of the program stored in the ROM or the like is executed at the rate (cycle) of the clock signal.
- the CPU performs an overcharge / discharge monitoring process and a self-diagnosis process for detecting a threshold characteristic deviation in accordance with a program.
- the microcomputer 40 functionally includes a threshold switching unit 41 and an abnormality detection unit 42 in order to realize an overcharge / discharge monitoring process and a threshold characteristic deviation self-diagnosis process.
- the threshold value switching unit 41 and the abnormality detection unit 42 can be realized according to a hardware circuit, hardware, and a program installed in the computer.
- the threshold switching unit 41 issues an instruction to the first switching unit 51 of the first monitoring circuit 50 and the second switching unit 61 of the second monitoring circuit 60, thereby turning on / off each switch 56 of the first switching unit 51.
- each switch 66 of the second switching unit 61 is switched on / off. That is, the threshold switching unit 41 switches between the partial pressure ratio of the first switching unit 51 and the partial pressure ratio of the second switching unit 61.
- the voltage division ratio of the first switching unit 51 is a ratio of dividing the 11 resistors 55a1 to 55a11 connected in series into the first wiring 31 side and the second wiring 32 side.
- the voltage corresponding to the overdischarge detection threshold is calculated by using one resistor 55a1 connected to the first wiring 31 among the eleven resistors 55 connected in series and the remaining ten resistors 55a2 to 55a11 connected in series. Is the partial pressure.
- “switch the voltage dividing ratio of the first switching unit 51” is connected to a connection point between the resistor 55a1 connected to the first wiring 31 and the resistor 55a2 connected to the resistor 55a1 in each switch 56.
- the switch 56a1 is turned on and the other switches 56a2 to 56a10 are turned off.
- the voltage division ratio of the second switching unit 61 and “the voltage division ratio of the first switching unit 51”.
- the threshold value switching unit 41 sets the threshold voltage corresponding to the overcharge detection threshold value or the overdischarge detection threshold value for each of the first switching unit 51 and the second switching unit 61.
- a command to switch the switch 56 and the switch 66 is issued to the first switching unit 51 and the second switching unit 61, respectively, so as to output.
- the microcomputer 40 determines whether the battery 10 is overdischarged or overcharged based on the first output and the second output input from the first monitoring circuit 50 and the second monitoring circuit 60.
- the threshold switching unit 41 switches the threshold used in the first monitoring circuit 50 and the threshold used in the second monitoring circuit 60 to the same value.
- the threshold switching unit 41 switches each of the switches 56 and 66 in the same manner to the first switching unit 51 and the second switching unit 61 in order, respectively, from the first threshold to the eighth threshold.
- a command for switching the threshold voltage to a plurality of levels and outputting it is issued. Thereby, the value of the threshold voltage output from the 1st switching part 51 and the 2nd switching part 61 is switched in steps similarly.
- the abnormality detector 42 detects that an abnormality has occurred in the threshold when the comparison result (first output) of the first monitoring circuit 50 and the comparison result (second output) of the second monitoring circuit 60 are different. It is. “An abnormality has occurred in the threshold” means that, in the first monitoring circuit 50, a failure has occurred in any of the first switching unit 51, the first reference voltage source 52, and the first comparator 53. This means that there is a characteristic shift. The same applies to the second monitoring circuit 60. That is, the abnormality detection unit 42 detects a threshold characteristic deviation of the first switching unit 51 or the second switching unit 61 when the first output and the second output are different.
- the abnormality detection unit 42 outputs the comparison result output from the first comparator 53 and the second comparator 63 after the threshold switching unit 41 switches the thresholds of the switching units 51 and 61 by one step.
- the comparison result of the first comparator 53 is different from the comparison result of the second comparator 63, it is detected that an abnormality has occurred in the threshold value. Since the threshold value ranges from the first threshold value to the eighth threshold value, the abnormality detection unit 42 sequentially compares the first output and the second output of each comparator 53, 63 when each threshold value is switched stepwise. Do.
- the first output and the second output are the same unless the threshold characteristic deviation occurs in each of the monitoring circuits 50 and 60, and the first output and the second output differ if the threshold characteristic deviation occurs. . Therefore, by detecting that the outputs are different by the abnormality detection unit 42, it is possible to detect that the threshold characteristic deviation has occurred in the first monitoring circuit 50 or the second monitoring circuit 60.
- the above is the overall configuration of the voltage monitoring apparatus 20 according to the present embodiment and the voltage monitoring system including the voltage monitoring apparatus 20.
- the monitoring operation and overcharge / discharge detection operation in the voltage monitoring device 20 are, for example, when the voltage monitoring device 20 is turned on or off, or when the voltage monitoring device 20 receives an external command. To begin.
- the voltage monitoring device 20 When executing the overcharge / discharge detection function, the voltage monitoring device 20 operates in an overcharge detection mode and an overdischarge detection mode. In the present embodiment, the voltage monitoring device 20 first executes the overcharge detection function when the voltage monitoring device 20 is turned on or off, or when the voltage monitoring device 20 receives an external command. Then, after the execution of the overcharge detection function is completed, the overdischarge detection function is executed.
- each switching unit is instructed by a command from the threshold switching unit 41 to the first switching unit 51 of the first monitoring circuit 50 and the second switching unit 61 of the second monitoring circuit 60.
- the switches 56 and 66 are switched so that a threshold voltage corresponding to the overcharge detection threshold is output from 51 and 61.
- the comparators 53 and 63 compare the threshold voltage corresponding to the overcharge detection threshold with the first and second reference voltages, and input the results from the comparators 53 and 63 to the microcomputer 40, respectively. Is done.
- each of the first and second reference voltages is constant, it is substantially equivalent to compare the threshold voltage corresponding to the divided voltage value of the battery 10 with each of the first and second reference voltages. Means that the voltage of the battery 10 and each of the first and second reference voltages increased by the difference between the battery voltage and the threshold voltage are relatively compared.
- the microcomputer 40 determines whether or not the voltage of the battery 10 is overcharged based on whether the first and second outputs of the first and second comparators 53 and 63 are high level or low level.
- the threshold voltage which varies depending on the battery voltage
- the overcharge detection threshold very low voltage dividing value
- the threshold voltage corresponding to the overcharge detection threshold (which changes depending on the battery voltage) is higher than the first and second reference voltages. ing. Therefore, the first and second outputs of the first and second comparators 53 and 63 are at a high level and are output from the first and second comparators 53 and 63. Therefore, it is determined that the battery 10 is overcharged.
- the threshold switching unit 41 issues an overdischarge from each switching unit 51, 61 according to a command to each switching unit 51, 61.
- the switches 56 and 66 are switched so that a threshold voltage corresponding to the detection threshold is output.
- the comparators 53 and 63 compare the threshold voltage corresponding to the overdischarge detection threshold with the first and second reference voltages, and the results are input from the comparators 53 and 63 to the microcomputer 40, respectively.
- the microcomputer 40 determines whether or not the voltage of the battery 10 is overdischarged depending on whether the first and second outputs of the first and second comparators 53 and 63 are high level or low level.
- the threshold voltage which changes depending on the battery voltage
- the overdischarge detection threshold a high voltage division value close to the battery voltage
- the first and second outputs of the first and second comparators 53 and 63 are at a high level and are output from the first and second comparators 53 and 63. Therefore, it is determined that the battery 10 is not overdischarged.
- the threshold voltage corresponding to the overdischarge detection threshold (which changes depending on the battery voltage) is lower than the first and second reference voltages. ing. Accordingly, the first and second outputs of the first and second comparators 53 and 63 are at a low level and are output from the first and second comparators 53 and 63. Therefore, it is determined that the battery 10 is overdischarged.
- overcharge / discharge detection is performed based on the output of each of the first and second monitoring circuits 50, 60. Overdischarge detection may be performed based on only one of the outputs.
- FIG. 2 is an input / output timing chart of the first comparator 53 and the second comparator 63 when there is no threshold characteristic deviation between the first switching unit 51 and the second switching unit 61.
- FIG. 3 is an input / output timing chart of the first comparator 53 and the second comparator 63 when there is a shift in threshold characteristics between the first switching unit 51 and the second switching unit 61.
- the threshold switching unit 41 performs the same timing for each of the first switching unit 51 of the first monitoring circuit 50 and the second switching unit 61 of the second monitoring circuit 60.
- a first command with the same content is issued.
- the “first command” is a command for outputting a threshold voltage corresponding to the first threshold value from each of the switching units 51 and 61.
- each switch 56 of the first switching unit 51 is switched, the voltage of the battery 10 is divided, and a threshold voltage corresponding to the first threshold value is output from the first switching unit 51.
- each switch 66 of the second switching unit 61 is switched to divide the voltage of the battery 10, and a threshold voltage corresponding to the first threshold is output from the second switching unit 61.
- the first comparator 53 the first reference voltage input from the first reference voltage source 52 is compared with the threshold voltage input from the first switching unit 51, and the comparison result is detected as an abnormality as the first output. Is output to the unit 42.
- the second comparator 63 compares the second reference voltage input from the second reference voltage source 62 with the threshold voltage input from the second switching unit 61, and the comparison result is abnormal as the second output. It is output to the detection unit 42.
- the first output and the second output are high level signals, respectively, and when the threshold voltage is lower than the first and second reference voltages, the first output and Each of the second outputs is a low level signal.
- the abnormality detection unit 42 compares the first output input from the first comparator 53 with the second output input from the second comparator 63.
- the second command is a command for outputting a threshold voltage corresponding to the second threshold value from each of the switching units 51 and 61.
- the first output of the first comparator 53 and the second output of the second comparator 63 are respectively input to the abnormality detection unit 42 and compared in the same manner as when the first command is issued.
- Each command is issued in order from the threshold value switching unit 41 to the eighth command, such as the third command and the fourth command, at regular intervals from the second command.
- the voltage of the battery 10 is divided in order by the voltage dividing ratio according to each instruction
- the first switching unit 51 and the second switching unit 61 gradually switch the threshold from the first threshold to the eighth threshold. And a threshold voltage corresponding to each threshold is output. In other words, it can be said that the first switching unit 51 and the second switching unit 61 relatively change the first reference voltage and the second reference voltage in a plurality of stages, respectively.
- the self-diagnosis mode in which the thresholds of the first switching unit 51 and the second switching unit 61 are switched in stages is executed, and there is no threshold characteristic deviation in the first monitoring circuit 50 and the second monitoring circuit 60.
- the input / output of each switching unit 51, 61 is shown as in FIG.
- the vertical axis of the upper timing chart indicates the voltage at the inverting input terminal ( ⁇ terminal voltage) and the voltage at the non-inverting input terminal of the first comparator 53 or the second comparator 63 ( ⁇ + Terminal voltage).
- the vertical axis of the lower timing chart indicates each output voltage of the first output of the first comparator 53 or the second output of the second comparator 63.
- the horizontal axis of the upper and lower timing charts indicates the switching stage of each threshold value from the first threshold value to the eighth threshold value.
- the configurations of the first switching unit 51 and the second switching unit 61 are exactly the same, and the first and second reference generated by the first reference voltage source 52 and the second reference voltage source 62 are the same.
- the voltage is exactly the same voltage. Accordingly, when there is no threshold characteristic deviation in the first monitoring circuit 50 and the second monitoring circuit 60, the threshold voltage and the first reference voltage input to the first comparator 53 have the waveforms shown in FIG. The threshold voltage and the second reference voltage input to the second comparator 63 are the same.
- the threshold switching unit 41 switches the outputs of the first switching unit 51 and the second switching unit 61 step by step from the first threshold, for example, the first threshold to the fifth threshold correspond to these thresholds. If the threshold voltage is larger than the first and second reference voltages, the first output of the first comparator 53 and the second output of the second comparator 63 have the same high level output voltage. That is, the comparison results of the first comparator 53 and the second comparator 63 are the same high level output voltage.
- the threshold voltage is smaller than the first and second reference voltages.
- the first output of the first comparator 53 and the second output of the second comparator 63 have the same low level output voltage. That is, the switching timing from the fifth threshold value to the sixth threshold value becomes the inversion timing of each output of each comparator 53, 63, and each comparison result of each comparator 53, 63 becomes the same low level output voltage.
- the abnormality detection unit 42 determines that the comparison results of the first monitoring circuit 50 and the second monitoring circuit 60 from the first threshold value to the eighth threshold value are the same, and this determination determines that the first monitoring circuit 50 and the second monitoring circuit 60 are the same. It is detected that there is no abnormality in the monitoring circuit 60.
- the inputs and outputs of the switching units 51 and 61 are not the same.
- the threshold characteristic deviation is caused by, for example, a characteristic change of the first reference voltage source 52 or the second reference voltage source 62, a change in resistance value of each resistor 55, or the like.
- the threshold characteristic deviation in the first monitoring circuit 50 is a characteristic deviation in which the output of the first switching unit 51 is largely shifted by a certain value. That is, as shown in FIG. 3, the voltage (+ terminal voltage) of the non-inverting input terminal of the first comparator 53 in the first monitoring circuit 50 is a constant value than the voltage of the non-inverting input terminal of the second comparator 63. Only getting bigger.
- the relationship between the vertical axis and the horizontal axis of the upper and lower timing charts in FIG. 3 is the same as that shown in FIG.
- the threshold switching unit 41 switches the outputs of the first switching unit 51 and the second switching unit 61 step by step in order from the first threshold, in the second monitoring circuit 60 having no threshold characteristic deviation, for example, From the first threshold value to the fifth threshold value, the first output of the first comparator 53 and the second comparator 63 are the same as described above if the threshold voltage corresponding to each of these threshold values is greater than the second reference voltage.
- the second output is the same high level output voltage. That is, from the first threshold value to the fifth threshold value, the comparison results of the first comparator 53 and the second comparator 63 are the same high level output voltage.
- the threshold switching unit 41 switches the outputs of the first switching unit 51 and the second switching unit 61 to the sixth threshold
- the second monitoring circuit 60 having no threshold characteristic deviation has the threshold voltage and the second reference voltage.
- the magnitude relationship between the threshold voltage and the first reference voltage is not inverted. Therefore, the second output of the second comparator 63 is a low level output voltage, and the first output of the first comparator 53 is maintained at a high level output voltage. That is, the switching timing from the fifth threshold value to the sixth threshold value becomes the output inversion timing in the second monitoring circuit 60.
- the threshold value switching unit 41 switches the outputs of the switching units 51 and 61 to the seventh threshold value
- the second output of the second comparator 63 maintains the low level output voltage
- the first comparison The first output of the device 53 is maintained at a high level output voltage. That is, the comparison results of the first comparator 53 and the second comparator 63 are different between the sixth threshold value and the seventh threshold value.
- the threshold switching unit 41 switches the outputs of the switching units 51 and 61 to the eighth threshold, in the first monitoring circuit 50 having a threshold characteristic shift, there is a magnitude relationship between the threshold voltage and the first reference voltage. Invert. Therefore, the first output of the first comparator 53 is maintained at the low level output voltage. The second output of the second comparator 63 is maintained at the low level output voltage from when the second comparator 63 is switched to the sixth threshold value. That is, the switching timing from the seventh threshold value to the eighth threshold value becomes the output inversion timing in the first monitoring circuit 50.
- the abnormality detection unit 42 determines that the comparison results of the first monitoring circuit 50 and the second monitoring circuit 60 from the first threshold value to the eighth threshold value are different, and the first monitoring circuit 50 and the second monitoring circuit are determined by this determination. 60 detects that there is an abnormality. That is, the abnormality detection unit 42 detects a threshold characteristic deviation based on a difference in inversion timing between the first output and the second output. In this way, a threshold characteristic deviation is detected.
- the first and second switching units 51 and 61 provided in the first and second monitoring circuits 50 and 60 are set to “each threshold value from the first threshold value to the eighth threshold value”. Are sequentially issued, and the outputs of the first and second comparators 53 and 63 are compared with each other by the abnormality detection unit 42, whereby each of the first and second outputs is output. It is characterized in that a threshold characteristic deviation of the monitoring circuits 50 and 60 is detected.
- each of the first and second monitoring circuits 50, 60 is configured. It is possible to detect that a threshold characteristic deviation has occurred in any one of them. Therefore, it is possible to improve the determination accuracy of the threshold characteristic deviation.
- the present embodiment is characterized in that the first and second switching units 51 and 61 switch the threshold value for detecting the threshold characteristic deviation into eight levels of the first threshold value to the eighth threshold value. .
- the threshold value since the threshold value is switched in multiple stages, it is possible to prevent the magnitude relationship between the threshold value and the reference voltage from being reversed even if the threshold value has a characteristic shift. That is, even when the voltage of the battery 10 is not fluctuating, it is possible to obtain a comparison result in which the magnitude relationship between the threshold and the voltage of the battery 10 is reversed and a comparison result in which the magnitude relationship is not reversed. Deviation can be detected.
- it is possible to improve the accuracy of threshold characteristic deviation determination.
- the overcharge detection threshold and the overdischarge detection threshold correspond to the “monitoring threshold” in the claims.
- the first monitoring circuit 50 corresponds to “first means” in the claims
- the second monitoring circuit 60 corresponds to “second means” in the claims.
- the first threshold value to the eighth threshold value of the first switching unit 51 correspond to the “first diagnosis threshold value” in the claims
- the first threshold value to the eighth threshold value of the second switching unit 61 are the “first number” in the claims. This corresponds to “2 diagnostic threshold”.
- first switching unit 51 corresponds to “first voltage dividing unit” in the claims
- second switching unit 61 corresponds to “second voltage dividing unit” in the claims
- the threshold switching unit 41 corresponds to “threshold switching unit” in the claims
- the abnormality detection unit 42 corresponds to “abnormality detection unit” in the claims. (Other embodiments)
- the voltage monitoring device 20 detects overcharge / discharge of the secondary battery as the battery 10, but the voltage monitoring device 20 may monitor the voltage of the primary battery as the battery 10.
- the voltage monitoring device 20 monitors the voltage of the primary battery, the voltage to be detected corresponds to the monitoring threshold value.
- each of the first and second switching units 51 and 61 is configured to switch the threshold value for performing the self-diagnosis of the threshold characteristic deviation into eight levels from the first threshold value to the eighth threshold value.
- the threshold value may be switched at least at one stage with the same constant value. As described above, even if the threshold value is switched by only one level, it is detected that the comparison results of the first and second comparators 53 and 63 are different before and after the threshold value is switched if a threshold characteristic deviation occurs. can do.
- the threshold value switching unit 41 adds 1 to each of the first and second monitoring circuits 50 and 60.
- the abnormality detection unit 42 may compare the comparison results of the first and second comparators 53 and 63 when two threshold values (for example, the first threshold value) are set. In this way, even if the threshold value is not changed stepwise, if the threshold characteristic deviation is large, each comparison result may be different. Therefore, it is possible to detect the threshold characteristic deviation only by using one threshold value. Is possible.
- the secondary battery has been described as an example of the battery 10, but the secondary battery can be applied to an in-vehicle battery mounted on an electric vehicle such as a hybrid vehicle. That is, the voltage monitoring device 20 may monitor the voltage of the in-vehicle battery.
- the threshold values of the switching units 51 and 61 are switched stepwise to detect the threshold characteristic deviation, so that the vehicle is stopped or ignition such as waiting for a signal. It is possible to diagnose a threshold characteristic deviation after turning off. In this case, since the vehicle is not moving, the threshold characteristic deviation can be diagnosed without being affected by the vehicle noise generated when the vehicle travels, and the determination accuracy of the threshold characteristic deviation can be improved.
- the abnormality is detected based on the comparison result of the first and second comparators 53 and 63 being different in the sixth threshold value or the seventh threshold value.
- the abnormality detection unit 42 determines that the comparison result of the first comparator 53 and the comparison result of the second comparator 63 are two or more of a plurality of stages of the first threshold value to the eighth threshold value.
- the overdischarge detection threshold value is larger than the first threshold value and the overcharge detection threshold value is smaller than the eighth threshold value.
- the values of these detection threshold values are examples.
- the overdischarge detection threshold value may be a value between the second threshold value and the third threshold value
- the overcharge detection threshold value may be a value between the sixth threshold value and the seventh threshold value.
- the first threshold value to the eighth threshold value are switched in descending order in which the threshold value decreases in the self-diagnosis, but may be switched in ascending order in which the threshold value increases.
- each of the first and second comparators 53 and 63 compares a threshold voltage corresponding to a certain threshold value (divided value of the battery voltage) with one of the corresponding first and second reference voltages.
- a threshold voltage corresponding to a certain threshold value (divided value of the battery voltage)
- the present invention is not limited to this configuration.
- the first comparator 53 compares the battery voltage with a threshold voltage corresponding to any of the overcharge detection threshold, the first to eighth thresholds, and the overdischarge detection threshold. It is possible to configure.
- the overcharge detection threshold is obtained by dividing a constant voltage from a certain voltage source by a ratio of the first resistor 55a1 and the sum of the remaining resistors 55a2 to 55a11. For example, in this modification, the overcharge detection threshold is set to 4.25V, and the overdischarge detection threshold is set to 1.75V.
- the second comparison air 63 also has the same configuration as the first comparator 53.
- Second monitoring circuit (second comparing means) 61 2nd switching part (2nd voltage dividing means) 62 Second reference voltage source 63 Second comparator
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Abstract
Description
監視閾値に基づいて電池電圧を監視し、かつ第1および第2の診断閾値に基づいて前記監視閾値を診断するための電圧監視装置であって、
前記電池電圧と前記監視閾値あるいは第1の診断閾値との間の第1の相対的な関係を求め、求めた第1の相対的関係を表す第1の情報を出力する第1の手段と、
前記電池電圧と前記監視閾値あるいは第2の診断閾値との間の第2の相対的な関係を求め、求めた第2の相対的関係を表す第2の情報を出力する第2の手段と、
前記監視を行う際には前記第1の手段で用いられる閾値を前記監視閾値に切り替えると共に前記第2比較手段で用いられる閾値を前記監視閾値に切り替え、前記診断を行う際には前記第1の手段で用いられる閾値を前記第1診断閾値に切り替えると共に前記第2の手段で用いられる閾値を前記第1診断閾値と同じ値の前記第2診断閾値に切り替える閾値切替手段と、
前記閾値切替手段により前記第1診断閾値と前記第2診断閾値とが前記同じ値に切り替えられた後に前記第1の手段から出力された第1の情報と前記第2の手段から出力された第2の情報とをそれぞれ受け取り、前記第1の手段の第1の情報と前記第2の手段の第2の情報とが異なるとき、前記閾値切替手段により切り替えられる閾値に異常が生じていることを検出する異常検出手段と、を備えていることを特徴とする電圧監視装置。
前記第1分圧手段の分圧と前記第1基準電圧源の第1基準電圧とをそれぞれ受け取り、前記第1分圧手段の分圧と前記第1基準電圧源の第1基準電圧との比較結果を前記第1の情報として出力する第1比較器と、を備え、前記第2の手段は、
前記監視閾値または前記第2診断閾値に相当する電圧を前記電池の電圧の分圧として出力する第2分圧手段と、
前記第1基準電圧と同じ第2基準電圧を出力する第2基準電圧源と、
前記第2分圧手段の分圧と前記第2基準電圧源の第2基準電圧とをそれぞれ入力し、前記第2分圧手段の分圧と前記第2基準電圧源の第2基準電圧との比較結果を前記第2の情報として出力する第2比較器と、を備えており、
前記閾値切替手段は、前記第1分圧手段の分圧比および前記第2分圧手段の分圧比をそれぞれ切り替えることにより、前記第1の手段で用いられる閾値を前記第1の診断閾値に切り替え、かつ前記2の手段で用いられる閾値を前記第2の診断閾値に切り替えることを特徴とする請求項1ないし3のいずれか1つに記載の電圧監視装置。
基準電圧を分圧して前記監視閾値または前記第1診断閾値に相当する分圧電圧を出力する第1分圧手段と、
前記第1分圧手段の分圧電圧と前記電源電圧とをそれぞれ受け取り、該分圧電圧と電源電圧とを比較し、その比較結果を前記第1の情報として出力する第1比較器と、を備え、
前記第2の手段は、
前記基準電圧を分圧して前記監視閾値または前記第2診断閾値に相当する分圧電圧を出力する第2分圧手段と、
前記第2分圧手段の分圧電圧と前記電源電圧とをそれぞれ受け取り、該分圧電圧と電源電圧とを比較し、その比較結果を前記第2の情報として出力する第2比較器と、を備え、
前記閾値切替手段は、前記第1分圧手段の分圧比および前記第2分圧手段の分圧比をそれぞれ切り替えることにより、前記第1の手段で用いられる閾値を前記第1の診断閾値に切り替え、かつ前記2の手段で用いられる閾値を前記第2の診断閾値に切り替えることを特徴とする。
クロック信号のレート(周期)で、ROM等に記憶されたプログラムの各命令を実行するようになっている。
(他の実施形態)
41 閾値切替部(閾値切替手段)
42 異常検出部(異常検出手段)
50 第1監視回路(第1比較手段)
51 第1切替部(第1分圧手段)
52 第1基準電圧源
53 第1比較器
60 第2監視回路(第2比較手段)
61 第2切替部(第2分圧手段)
62 第2基準電圧源
63 第2比較器
Claims (6)
- 監視閾値に基づいて電池電圧を監視し、かつ第1および第2の診断閾値に基づいて前記監視閾値を診断するための電圧監視装置であって、
前記電池電圧と前記監視閾値あるいは第1の診断閾値との間の第1の相対的な関係を求め、求めた第1の相対的関係を表す第1の情報を出力する第1の手段と、
前記電池電圧と前記監視閾値あるいは第2の診断閾値との間の第2の相対的な関係を求め、求めた第2の相対的関係を表す第2の情報を出力する第2の手段と、
前記監視を行う際には前記第1の手段で用いられる閾値を前記監視閾値に切り替えると共に前記第2比較手段で用いられる閾値を前記監視閾値に切り替え、前記診断を行う際には前記第1の手段で用いられる閾値を前記第1診断閾値に切り替えると共に前記第2の手段で用いられる閾値を前記第1診断閾値と同じ値の前記第2診断閾値に切り替える閾値切替手段と、
前記閾値切替手段により前記第1診断閾値と前記第2診断閾値とが前記同じ値に切り替えられた後に前記第1の手段から出力された第1の情報と前記第2の手段から出力された第2の情報とをそれぞれ受け取り、前記第1の手段の第1の情報と前記第2の手段の第2の情報とが異なるとき、前記閾値切替手段により切り替えられる閾値に異常が生じていることを検出する異常検出手段と、を備えていることを特徴とする電圧監視装置。 - 前記閾値切替手段は、前記第1診断閾値および前記第2診断閾値を複数段階に切り替えることを特徴とする請求項1に記載の電圧監視装置。
- 前記異常検出手段は、前記第1比較手段の比較結果と前記第2比較手段の比較結果とが前記複数段階のうちの2段階以上連続して異なっているとき、前記監視閾値に異常が生じていることを検出することを特徴とする請求項2に記載の電圧監視装置。
- 前記第1の手段は、
前記監視閾値または前記第1診断閾値に相当する電圧を前記電池の電圧の分圧として出力する第1分圧手段と、
第1基準電圧を出力する第1基準電圧源と、
前記第1分圧手段の分圧と前記第1基準電圧源の第1基準電圧とをそれぞれ受け取り、前記第1分圧手段の分圧と前記第1基準電圧源の第1基準電圧との比較結果を前記第1の情報として出力する第1比較器と、を備え、
前記第2の手段は、
前記監視閾値または前記第2診断閾値に相当する電圧を前記電池の電圧の分圧として出力する第2分圧手段と、
前記第1基準電圧と同じ第2基準電圧を出力する第2基準電圧源と、
前記第2分圧手段の分圧と前記第2基準電圧源の第2基準電圧とをそれぞれ入力し、前記第2分圧手段の分圧と前記第2基準電圧源の第2基準電圧との比較結果を前記第2の情報として出力する第2比較器と、を備えており、
前記閾値切替手段は、前記第1分圧手段の分圧比および前記第2分圧手段の分圧比をそれぞれ切り替えることにより、前記第1の手段で用いられる閾値を前記第1の診断閾値に切り替え、かつ前記2の手段で用いられる閾値を前記第2の診断閾値に切り替えることを特徴とする請求項1ないし3のいずれか1つに記載の電圧監視装置。 - 前記第1診断閾値および前記第2診断閾値は、前記電池で使用される電圧の範囲内に設定されていることを特徴とする請求項1ないし4のいずれか1つに記載の電圧監視装置。
- 前記第1の手段は、
基準電圧を分圧して前記監視閾値または前記第1診断閾値に相当する分圧電圧を出力する第1分圧手段と、
前記第1分圧手段の分圧電圧と前記電源電圧とをそれぞれ受け取り、該分圧電圧と電源電圧とを比較し、その比較結果を前記第1の情報として出力する第1比較器と、を備え、
前記第2の手段は、
前記基準電圧を分圧して前記監視閾値または前記第2診断閾値に相当する分圧電圧を出力する第2分圧手段と、
前記第2分圧手段の分圧電圧と前記電源電圧とをそれぞれ受け取り、該分圧電圧と電源電圧とを比較し、その比較結果を前記第2の情報として出力する第2比較器と、を備え、
前記閾値切替手段は、前記第1分圧手段の分圧比および前記第2分圧手段の分圧比をそれぞれ切り替えることにより、前記第1の手段で用いられる閾値を前記第1の診断閾値に切り替え、かつ前記2の手段で用いられる閾値を前記第2の診断閾値に切り替えることを特徴とする請求項1ないし3のいずれか1つに記載の電圧監視装置。
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US8854047B2 (en) | 2014-10-07 |
EP2434302B8 (en) | 2019-03-13 |
EP2434302A1 (en) | 2012-03-28 |
US20120001639A1 (en) | 2012-01-05 |
JP2011078165A (ja) | 2011-04-14 |
EP2434302A4 (en) | 2013-10-30 |
EP2434302B1 (en) | 2018-11-07 |
JP5321392B2 (ja) | 2013-10-23 |
CN102576040B (zh) | 2015-04-15 |
CN102576040A (zh) | 2012-07-11 |
KR101298661B1 (ko) | 2013-08-21 |
KR20110132417A (ko) | 2011-12-07 |
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