In a voltage detecting apparatus, a voltage controlled oscillator, when an input voltage is applied thereto, outputs a signal with a logical value that is periodically inverted. A detector counts a number of logical inversion of the output signal from the voltage controlled oscillator over an interv
In a voltage detecting apparatus, a voltage controlled oscillator, when an input voltage is applied thereto, outputs a signal with a logical value that is periodically inverted. A detector counts a number of logical inversion of the output signal from the voltage controlled oscillator over an interval between edges of pulses of a pulse signal to thereby generate, based on the counted number of logical inversion, digital data as a detected result of the input voltage. A determiner determines whether a reduction of a time required to detect the input voltage is higher in priority than an increase of a resolution of detection of the input voltage. A variably setting unit variably sets a frequency of the pulse signal based on a result of the determination of whether the reduction of the time required to detect the input voltage is higher in priority than the increase of the resolution of detection of the input voltage.
대표청구항▼
1. A voltage detecting apparatus comprising: a voltage controlled oscillator configured to, when an input voltage is applied thereto, output a signal with a logical value that is periodically inverted;a detector configured to count a number of logical inversion of the output signal from the voltage
1. A voltage detecting apparatus comprising: a voltage controlled oscillator configured to, when an input voltage is applied thereto, output a signal with a logical value that is periodically inverted;a detector configured to count a number of logical inversion of the output signal from the voltage controlled oscillator over an interval between edges of pulses of a pulse signal to thereby generate, based on the counted number of logical inversion, digital data as a detected result of the input voltage;a determiner configured to determine whether a reduction of a time required to detect the input voltage is higher in priority than an increase of a resolution of detection of the input voltage; anda variably setting unit configured to variably set a frequency of the pulse signal based on a result of the determination of whether the reduction of the time required to detect the input voltage is higher in priority than the increase of the resolution of detection of the input voltage. 2. The voltage detecting apparatus according to claim 1, wherein the input voltage is based on a voltage across a battery, the voltage across the battery being a target voltage to be detected. 3. The voltage detecting apparatus according to claim 2, wherein the determiner is configured to obtain an absolute value of currents flowing into and out of the battery, and determine that the increase of the resolution of detection of the input voltage is higher in priority than the reduction of the time required to detect the input voltage when the obtained absolute value is lower than a preset value. 4. The voltage detecting apparatus according to claim 2, wherein an electrical load is connected to the battery and is activated based on the voltage across the battery, and the determiner is configured to determine that the increase of the resolution of detection of the input voltage is higher in priority than the reduction of the time required to detect the input voltage when the electrical load is deactivated. 5. The voltage detecting apparatus according to claim 4, wherein the battery is connected to the electrical load via a switch, and electrical connection between the battery and the electrical load is established when the switch is controlled to be closed, and the determiner is configured to determine whether the reduction of the time required to detect the input voltage is higher in priority than the increase of the resolution of detection of the input voltage based on an open or close state of the switch. 6. The voltage detecting apparatus according to claim 2, wherein the battery serves as a power source of a power generator installed in a vehicle, and the determiner is configured to obtain a running condition of the vehicle, and determine whether the increase of the resolution of detection of the input voltage is higher in priority than the reduction of the time required to detect the input voltage based on the obtained running condition of the vehicle. 7. The voltage detecting apparatus according to claim 2, wherein, when a temperature of the battery is lower than a preset value, the battery is cyclically charged and discharged by a charge and discharge unit such that the temperature of the battery is increased, and the determiner is configured to determine that the reduction of the time required to detect the input voltage is higher in priority than the increase of the resolution of detection of the input voltage. 8. The voltage detecting apparatus according to claim 7, wherein, when the battery is cyclically charged and discharged by the charge and discharge unit, the determiner determines that a priority level of the reduction of the time required to detect the input voltage is the highest. 9. The voltage detecting apparatus according to claim 7, wherein, when the battery is cyclically charged and discharged by the charge and discharge unit, the variably setting unit is configured to variably set the frequency of the pulse signal to be higher than a frequency of the cyclic charge and discharge of the battery. 10. The voltage detecting apparatus according to claim 1, wherein the voltage controlled oscillator comprises of a first voltage controlled oscillating unit and a second voltage controlled oscillating unit, each of the first and second voltage controlled oscillating units configured to, when the input voltage is applied thereto, output the signal with the logical value that is periodically inverted, the detector comprises of a first detecting unit and a second detecting unit, each of the first and second detecting units configured to count the number of logical inversion of the output signal from a corresponding one of the first and second voltage controlled oscillating units over the interval between the edges of the pulses of the pulse signal to thereby generate, based on the counted number of logical inversion, the digital data as the detected result of the input voltage, and the variably setting unit is configured to variably set the frequencies of the pulse signals for the first and second voltage controlled oscillating units to be different from each other. 11. The voltage detecting apparatus according to claim 1, wherein the detector comprises of a first detecting unit and a second detecting unit, each of the first and second detecting units configured to count the number of logical inversion of the output signal from a corresponding one of the first and second voltage controlled oscillating units over the interval between the edges of the pulses of the pulse signal to thereby generate, based on the counted number of logical inversion, the digital data as the detected result of the input voltage, further comprising: a comparing unit configured to compare the digital data generated by the first detecting unit with the digital data generated by the second detecting unit; andan abnormality diagnosing unit configured to diagnose that an abnormality occurs in the voltage detecting apparatus when a difference between the digital data generated by the first detecting unit and the digital data generated by the second detecting unit exceeds a specified value. 12. The voltage detecting apparatus according to claim 1, wherein at least one of the voltage controlled oscillator and the detector includes an electronic element having an input-output characteristic, further comprising: a compensating unit configured to compensate an error included in the digital data generated by the determiner, the error being due to the input-output characteristic of the electronic element. 13. The voltage detecting apparatus according to claim 12, wherein the compensating unit comprises: a generator configured to: apply a plurality of reference voltage values to the voltage controlled oscillator as the input voltage so that a plurality of output signals are obtained from the voltage controlled oscillator, the plurality of output signals corresponding to the plurality of reference voltage values, respectively; andgenerate, based on the plurality of output signals, information indicative of a relationship between a variable of the input voltage and the plurality of output signals; anda calculator configured to calculate corrected digital data based on the digital data generated by the detector and the generated information indicative of the relationship between the variable of the input voltage and the plurality of output signals. 14. The voltage detecting apparatus according to claim 13, wherein the generator is configured to repeatedly generate the information indicative of the relationship between the variable of the input voltage and the plurality of output signals such that: a number of generation of the information when it is determined that the reduction of the time required to detect the input voltage is higher in priority than the increase of the resolution of detection of the input voltage is greater than a number of generation of the information when it is determined that the increase of the resolution of detection of the input voltage is higher in priority than the reduction of the time required to detect the input voltage. 15. The voltage detecting apparatus according to claim 1, wherein the variably setting unit is configured to variably set the frequency of the pulse signal based on: the result of the determination of whether the reduction of the time required to detect the input voltage is higher in priority than the increase of the resolution of detection of the input voltage; anda history of changes of the frequency of the pulse signal. 16. A battery state control system comprising: the voltage detecting apparatus according to claim 7; andthe charge and discharge unit configured to:cyclically charge and discharge the battery such that the temperature of the battery is increased; andchange, with increase in the temperature of the battery, at least one of: a frequency of the cyclic charge and discharge of the battery, and an amount of currents flowing into and out of the battery by the cyclic charge and discharge. 17. A battery state control system for controlling a state of a battery, the system comprising: a charge and discharge unit configured to:cyclically charge and discharge the battery when a temperature of the battery is lower than a preset value; andcarry out:a process to change, with increase in the temperature of the battery by the charge and discharge, a frequency of the cyclic charge and discharge of the battery; anda process to increase, with increase in the temperature of the battery by the charge and discharge, an amount of currents flowing into and out of the battery by the cyclic charge and discharge,wherein the charge and discharge unit is configured to reduce the frequency of the cyclic charge and discharge of the battery with increase in the temperature of the battery by the charge and discharge. 18. The battery state control system according to claim 17, wherein the charge and discharge unit is configured to cyclically charge and discharge the battery on a condition that a voltage across the battery is equal to or lower than an upper limit. 19. The battery state control system according to claim 17, wherein the charge and discharge unit is configured to increase, with increase in the temperature of the battery by the charge and discharge, the amount of currents flowing into and out of the battery by the cyclic charge and discharge. 20. The battery state control system according to claim 19, wherein the charge and discharge unit is configured to carry out feedback control of a locally maximum value of the voltage across the battery to be adjusted to a target value to thereby increase the amount of currents flowing into and out of the battery. 21. The battery state control system according to claim 17, wherein the charge and discharge unit is configured to carry out feedback control of a locally maximum value of the voltage across the battery to be adjusted to a target value to thereby reduce the frequency of the cyclic charge and discharge of the battery. 22. The battery state control system according to claim 17, wherein the charge and discharge unit is configured to increase, with increase in the temperature of the battery by the charge and discharge, the amount of currents flowing into and out of the battery by the cyclic charge and discharge while changing the frequency of the cyclic charge and discharge with increase in the temperature of the battery by the charge and discharge. 23. The battery state control system according to claim 17, wherein the charge and discharge unit comprises: a capacitor; anda power converter configured to convert an input voltage into a converted voltage, and apply the converted voltage to the capacitor,the charge and discharge unit is configured to control the power converter to generate an oscillated voltage as the converted voltage, the oscillated voltage allowing an oscillated current to flow through the battery.
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이 특허에 인용된 특허 (3)
Watanabe Takamoto (Nagoya JPX) Ohtsuka Yoshinori (Okazaki JPX) Hattori Tadashi (Okazaki JPX), Analog-to-digital conversion circuit having a pulse circulating portion.
Lee, Chulseung, Method and system for controlling charging parameters of a battery using a plurality of temperature ranges and counters and parameter sets.
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