초록 ▼

A comparator circuit includes: a switching element that is disposed between a positive electrode of a battery cell and a fixed potential supply source, that has a control terminal connected to a negative electrode of the battery cell, and that operates in response to a voltage applied from the batte

A comparator circuit includes: a switching element that is disposed between a positive electrode of a battery cell and a fixed potential supply source, that has a control terminal connected to a negative electrode of the battery cell, and that operates in response to a voltage applied from the battery cell to the control terminal; a voltage regulating unit that is disposed between the battery cell and the switching element and that regulates the voltage applied from the battery cell to the switching element; and an output signal line that outputs a potential between the switching element and the fixed potential supply source.

대표청구항 ▼

1. A comparator circuit comprising: a switching element having a first terminal connected to a positive electrode of a battery cell, a second terminal connected to a first fixed potential supply source, and a control terminal that controls conduction between the first terminal and the second termina

1. A comparator circuit comprising: a switching element having a first terminal connected to a positive electrode of a battery cell, a second terminal connected to a first fixed potential supply source, and a control terminal that controls conduction between the first terminal and the second terminal in response to an applied voltage;a voltage regulating unit that has one end connected to a negative electrode of the battery cell, and another end connected to the control terminal and to a second fixed potential supply source, and that regulates the applied voltage from the battery cell to the switching element; andan output signal line connected to a connecting portion of the second terminal and the first fixed potential supply source. 2. The comparator circuit according to claim 1, further comprising: a first constant current source having one end connected to a connecting portion of the control terminal and the another end of the voltage regulating unit, and another end connected to the second fixed potential supply source; anda second constant current source having one end connected to a connecting portion of the second terminal and the output signal line, and another end connected to the first fixed potential supply source. 3. The comparator circuit according to claim 2, wherein the first fixed potential supply electrode and the second fixed potential supply electrode supply a same potential. 4. The comparator circuit according to claim 2, wherein the voltage regulating unit is a resistor that lowers the applied voltage from the battery cell to the control terminal. 5. The comparator circuit according to claim 4, wherein the resistor is a diode having an anode that is connected to the negative electrode of the battery cell and a cathode that is connected to the control terminal of the switching element. 6. A semiconductor device comprising: the comparator circuit according to claim 1; anda processing circuit that performs processing that prohibits charging of the battery cell in a case in which a potential output from the output signal line of the comparator circuit is a potential of the first fixed potential supply source. 7. The semiconductor device according to claim 6, wherein the comparator circuit is respectively provided for each battery cell of a plurality of battery cells. 8. The semiconductor device according to claim 6, wherein the comparator circuit is respectively provided for each battery cell in the plurality of battery cells. 9. A battery monitoring system comprising: a plurality of battery cells connected in series;a semiconductor device comprising the comparator circuit according to claim 1, the comparator circuit comparing a voltage of a high potential side and a voltage of a low potential side of the battery cells; anda charging circuit that charges the plurality of battery cells. 10. A comparator circuit comprising: a switching element having a first terminal, a second terminal connected to a first fixed potential supply source, and a first control terminal that controls conduction of the first terminal and the second terminal in response to an applied voltage;a resistor having one end connected to the first terminal and another end connected to a positive electrode of a battery cell;an output signal line connected to a connecting portion of the second terminal and the first fixed potential supply source; anda transistor having a third terminal connected to a negative electrode of the battery cell, a fourth terminal connected to a second fixed potential supply source, and a second control terminal connected to the first control terminal and to a connecting portion of the fourth terminal and the second fixed potential supply source. 11. The comparator circuit according to claim 10, wherein the transistor is a PMOS transistor, the third terminal of the transistor being a source and the fourth terminal of the transistor being a drain. 12. The comparator circuit according to claim 10, further comprising: a first constant current source having one end connected to a connecting portion of the fourth terminal and the second fixed potential supply source, and another end connected to the second fixed potential supply source; anda second constant current source having one end connected to a connecting portion of the second terminal and the output signal line, and another end connected to the first fixed potential supply source. 13. The comparator circuit according to claim 12, wherein the first fixed potential supply electrode and the second fixed potential supply electrode supply a same potential.