Method of voltage measurement and apparatus for same

An apparatus for voltage measurement of a voltage supply comprising:

• a charging unit for charging a capacitor for a prescribed period of time of charging;
• a measuring unit for measuring a charge of the capacitor charged during a prescribed period of time of charge measurement;
• a microcomputer for calculating a voltage of the voltage supply from a measurement value of the charge;
• a reference voltage supply circuit connected between the capacitor and the microcomputer for supplying a reference voltage of voltage measurement during the prescribed period of time of charge measurement;
• and
• a correction measurement circuit connected between the capacitor and the reference voltage supply circuit, for supplying a voltage of a correction measurement voltage supply during the prescribed period of time of charging,
• said microcomputer including:
• a correction value calculating program for applying a voltage of a correction measurement voltage supply to the measuring unit, measuring the voltage of the correction measurement voltage supply during the prescribed period of time of charging, and calculating a correction value from a difference between a measurement value and a theoretical value of the voltage of the correction measurement voltage supply, and
• a voltage measurement program for subtracting the correction value calculated at the correction value calculating program from the measurement value of the charge during the prescribed period of time of charge measurement and for calculating the voltage of the voltage supply.

An apparatus for voltage measurement comprising:

• a capacitor;
• a first multiplexer for connecting the capacitor to a first voltage sensing terminal of an odd number voltage supply in N+1 voltage sensing terminals of N voltage supplies connected in series;
• a second multiplexer for connecting the capacitor to a second voltage sensing terminal of an even number voltage supply in the N+1 voltage sensing terminals;
• a reference voltage supply circuit connected between the capacitor and a microcomputer for supplying a reference voltage of voltage measurement during a prescribed period of time of charge measurement;
• a correction measurement circuit connected between the capacitor and the reference voltage supply circuit, for applying a voltage of a correction measurement voltage supply during a prescribed period of time of charging;
• and
• said microcomputer for calculating a voltage of the voltage supply from a measurement value of a charge of the capacitor,
• the microcomputer including:
• a correction value calculating program for applying the voltage of the correction measurement voltage supply to a measuring unit, measuring the voltage of the correction measurement voltage supply during the prescribed period of time of charging, and calculating a correction value from a difference between a measurement value and a theoretical value of the voltage of the correction measurement voltage supply, and
• a voltage measurement program for subtracting the correction value calculated at the correction value calculating program from the measurement value of the charge during the prescribed period of time of charge measurement and for calculating the voltage of the voltage supply.

An apparatus for voltage measurement comprising:

• a capacitor;
• a first multiplexer for connecting the capacitor to a first voltage sensing terminal of an odd number voltage supply in N+1 voltage sensing terminals of N voltage supplies connected in series;
• a second multiplexer for connecting the capacitor to a second voltage sensing terminal of an even number voltage supply in the N+1 voltage sensing terminals;
• a reference voltage supply circuit connected between the capacitor and a microcomputer, for supplying a reference voltage of voltage measurement to the microcomputer,
• said microcomputer for calculating a voltage of the voltage supply from a measurement value of a charge of the capacitor;
• and
• a correction measurement circuit connected between the capacitor and the reference voltage supply circuit for supplying a voltage of a correction measurement voltage supply during a prescribed period of time of charging,
• the microcomputer including:
• a correction value calculating program for supplying a voltage of the reference voltage supply circuit to the microcomputer, measuring the voltage of the reference voltage supply circuit, and calculating a correction value from a difference between a measurement value and a theoretical value of the voltage of the reference voltage supply circuit during a prescribed period of time of charging, and
• a voltage measurement program for subtracting the correction value calculated at the correction value calculating program from the measurement value of the charge during a prescribed period of time of charge measurement and for calculating the voltage of the voltage supply.