Voltage balance circuit, voltage detecting circuit, voltage balancing method, and voltage detecting method
First Claim
1. A voltage detection circuit that detects a voltage between both polarities of each storage circuit of a plurality of storage circuits (B1, B2, B3) connected to one another in series, comprising:
- a plurality of first capacitors (67, 68, 69);
a plurality of first switches (62, 64, 66) each having one end connected to one electrode of said each storage circuit (B1, B2, B3) and the other end connected to one electrode of said each first capacitor (67, 68, 69);
a charging switch (71) having one end connected in common to the other electrodes of said plurality of first capacitors (67, 68, 69) and the other end connected to a node that sets a reference electric potential;
a second capacitor (72) having one electrode connected to the other end of said charging switch (71);
a plurality of second switches (61, 63, 65) each having one end connected to the other electrode of said each storage circuit (B1, B2, B3) and the other end connected to said one electrode of said each first capacitor (67, 68, 69);
a voltage applying switch (70) having one end connected in common to said other electrodes of said plurality of first capacitors (67, 68, 69) and the other end connected to the other electrode of said second capacitor (72);
a pair of measuring terminals connected to both ends of said second capacitor (72); and
a control section (39) that controls said plurality of first switches (62, 64, 66), said charging switch (71), said plurality of second switches (61, 63, 65) and said voltage applying switch (70), and show a voltage between both polarities of said selected storage circuit (B1, B2, B3) for detection to said pair of measuring terminals as output, wherein the control section (39) selects one storage circuit (B1, B2, B3) from said plurality of storage circuits (B1, B2, B3), turn on said first switch (62, 64, 66) having one end connected to said selected storage circuit (B1, B2, B3) and said charging switch (71) to charge said first capacitor (67, 68, 69) with the voltage of one electrode of said selected storage circuit (B1, B2, B3), and turn off said plurality of first switches (62, 64, 66) and said charging switch (71), and turn on said second switch (61, 63, 65) and said voltage applying switch (70) to make said first capacitor (67, 68, 69) and said second capacitor (72) connected in series and apply the voltage of the other electrode of said selected storage circuit (B1, B2, B3) to said first capacitor (67, 68, 69) and said second capacitor (72), and make the voltage applied to said second capacitor (72) outputted at said pair of measuring terminals as the voltage between both polarities of said selected storage circuit.
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Accused Products
Abstract
When a control section (39) turns on a switch (31, 33, 35), a capacitor (37) is connected to a secondary battery (B1) in parallel. Accordingly, voltage between both ends of each capacitor (37, 38) reaches voltage between both polarities of each secondary battery (B1, B2). Thereafter, when the control section (39) turns off the switch (31, 33, 35) and turns on a switch (32, 34, 36), each capacitor (37, 38) is connected to the secondary battery (B2, B3) in parallel. The capacitor (37, 38) is charged/discharged to balance voltage between both polarities of the secondary battery (B1 to B3).
18 Citations
9 Claims
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1. A voltage detection circuit that detects a voltage between both polarities of each storage circuit of a plurality of storage circuits (B1, B2, B3) connected to one another in series, comprising:
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a plurality of first capacitors (67, 68, 69); a plurality of first switches (62, 64, 66) each having one end connected to one electrode of said each storage circuit (B1, B2, B3) and the other end connected to one electrode of said each first capacitor (67, 68, 69); a charging switch (71) having one end connected in common to the other electrodes of said plurality of first capacitors (67, 68, 69) and the other end connected to a node that sets a reference electric potential; a second capacitor (72) having one electrode connected to the other end of said charging switch (71); a plurality of second switches (61, 63, 65) each having one end connected to the other electrode of said each storage circuit (B1, B2, B3) and the other end connected to said one electrode of said each first capacitor (67, 68, 69); a voltage applying switch (70) having one end connected in common to said other electrodes of said plurality of first capacitors (67, 68, 69) and the other end connected to the other electrode of said second capacitor (72); a pair of measuring terminals connected to both ends of said second capacitor (72); and a control section (39) that controls said plurality of first switches (62, 64, 66), said charging switch (71), said plurality of second switches (61, 63, 65) and said voltage applying switch (70), and show a voltage between both polarities of said selected storage circuit (B1, B2, B3) for detection to said pair of measuring terminals as output, wherein the control section (39) selects one storage circuit (B1, B2, B3) from said plurality of storage circuits (B1, B2, B3), turn on said first switch (62, 64, 66) having one end connected to said selected storage circuit (B1, B2, B3) and said charging switch (71) to charge said first capacitor (67, 68, 69) with the voltage of one electrode of said selected storage circuit (B1, B2, B3), and turn off said plurality of first switches (62, 64, 66) and said charging switch (71), and turn on said second switch (61, 63, 65) and said voltage applying switch (70) to make said first capacitor (67, 68, 69) and said second capacitor (72) connected in series and apply the voltage of the other electrode of said selected storage circuit (B1, B2, B3) to said first capacitor (67, 68, 69) and said second capacitor (72), and make the voltage applied to said second capacitor (72) outputted at said pair of measuring terminals as the voltage between both polarities of said selected storage circuit. - View Dependent Claims (2, 3)
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4. A voltage detection circuit that detects voltage between both polarities of each storage circuit of a plurality of storage circuits (B1, B2, B3) connected to one another in series, comprising:
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a pair of measuring terminals (both ends of 71) capable of measuring voltage, one of the measuring terminals being connected to a node that sets a reference electric potential; a plurality of first switches (62, 64, 66) each having one end connected to one electrode of said each storage circuit (B1, B2, B3); a plurality of second switches (61, 63, 65) each connected between the other end of said each first switch (62, 64, 66) and other electrode of said each storage circuit (B1, B2, B3); a plurality of capacitors (67 to 69) corresponding to said respective storage circuit (B1, B2, B3) each having one electrode connected to a node between said each first switch (62, 64, 66) and said each second switch (61, 63, 65), and the other electrode connected in common to the other measuring terminal of said pair of measuring terminals (both ends of 71); a third switch (71) connected between said pair of measuring terminals; and a control section (39) that controls said plurality of first switches (62, 64, 66), said plurality of second switches (61, 63, 65) and said third switch (71), and show a voltage between both polarities of selected storage circuit (B1, B2, B3) between said pair of measuring terminals (both ends of 71), wherein the control section (39) turns on said first switch (62, 64, 66) connected to one storage circuit (B1, B2, B3) selected from a plurality of storage circuits (B1, B2, B3) connected to one another in series and said third switch (71) to charge said capacitor (67, 68, 69) corresponding to said selected storage circuit (B1, B2, B3), thereby detecting the voltage of one electrode of said selected storage circuit, and after turning off said first switch (62, 64, 66) and said third switch (71), turns on said second switch (61, 63, 65) connected to said selected storage circuit (B1, B2, B3), thereby detecting the voltage of the other electrode of said selected storage circuit (B1, B2, B3), and shows the differential voltage between the voltage of the other electrode and the voltage of one electrode of said selected storage circuit (B1, B2, B3) between said pair of measuring terminals (both ends of 71) as the voltage between both polarities of said storage circuit (B1, B2, B3) for detection. - View Dependent Claims (5, 6, 7)
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8. A voltage detection method of detecting voltage between both polarities of each storage circuit of a plurality of storage circuits (B1, B2, B3) connected to one another in series using a voltage detection circuit, the voltage detection circuit having a plurality of first capacitors (67, 68, 69), a plurality of first switches (62, 64, 66) each having one end connected to one electrode of said each storage circuit (B1, B2, B3) and the other end connected to one electrode of said each first capacitor (67, 68, 69), a charging switch (71) having one end connected in common to the other electrodes of said plurality of first capacitors (67, 68, 69) and the other end connected to a node that sets a reference electric potential, a second capacitor (72) having one electrode connected to the other end of said charging switch (71), a plurality of second switches (61, 63, 65) each having one end connected to the other electrode of said each storage circuit (B1, B2, B3) and the other end connected to said one electrode of said each first capacitor (67, 68, 69), a voltage applying switch (70) having one end connected in common to said other electrodes of said plurality of first capacitors (67, 68, 69) and the other end connected to the other electrode of said second capacitor (72), and a pair of measuring terminals connected to both ends of said second capacitor (72), wherein the voltage detection method of detecting voltage between both polarities of said each storage circuit, the method comprises the steps of:
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selecting one storage circuit (B1, B2, B3) from said plurality of storage circuits (B1, B2, B3) and turning on said first switch (62, 64, 66) and said charging switch (71) to charge said first capacitor (67, 68, 69) with the voltage of one electrode of said selected storage circuit (B1, B2, B3); turning off said first switch (62, 64, 66) and said charging switch (71); turning on said second switch (61, 63, 65) and said voltage applying switch (70) and connecting said first capacitor (67, 68, 69) and said second capacitor (72) to each other in series to apply voltage of the other electrode of said selected storage circuit (B1, B2, B3) to said first capacitor (67, 68, 69) and said second capacitor (72) connected to each other in series; and outputting the voltage applied to both ends of said second capacitor (72) as the voltage between both polarities of said selected storage circuit (B1, B2, B3) at said pair of measuring terminals.
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9. A voltage detection method of detecting voltage between both polarities of each storage circuits of a plurality of storage circuits (B1, B2, B3) connected to one another in series, using a voltage detection circuit, the voltage detection circuit having a pair of measuring terminals (both ends of 71) capable of measuring voltage, one of the measuring terminals being connected to a node that sets a reference electric potential, a plurality of first switches (62, 64, 66) each having one end connected to one electrode of said each storage circuit (B1, B2, B3), a plurality of second switches (61, 63, 65) each connected between the other end of said each first switch (62, 64, 66) and the other electrode of said each storage circuit (B1, B2, B3), a plurality of capacitors (67 to 69) corresponding to said respective storage circuit (B1, B2, B3), each having one electrode connected to a node between said each first switch (62, 64, 66) and said each second switch (61, 63, 65), and the other electrode connected in common to the other measuring terminal of said pair of measuring terminals (both ends of 71), and a third switch (71) connected between said pair of measuring terminals, the voltage detection method comprising the steps of:
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selecting one storage circuit (B1, B2, B3) from said plurality of storage circuits (B1, B2, B3) connected to one another in series and turning on said first switch (62, 64, 66) connected to said selected storage circuit (B1, B2, B3) and said third switch (71) to charge said capacitor (67, 68, 69) corresponding to said selected storage circuit (B1, B2, B3), thereby detecting the voltage of one electrode of said selected storage circuit (B1, B2, B3); turning off said first switch (62, 64, 66) and said third switch (71); turning on said second switch (61, 63, 65) connected to said selected storage circuit (B1, B2, B3) to detect the voltage of the other electrode of said selected storage circuit (B1, B2, B3), and showing the differential voltage between the voltage of the other electrode and the voltage of one electrode of said selected storage circuit (B1, B2, B3) between said pair of measuring terminals (both ends of 71) as the voltage between both polarities of said selected storage circuit (B1, B2, B3) for detection; and detecting at both ends of said pair of measuring terminals the voltage between both polarities of each storage circuit (B1, B2, B3).
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Specification