US 7,248,020 B2 · Battery-voltage monitoring integrated-circuit and battery-voltage monitoring system

Abstract

A first voltage source terminal, to which a first voltage is input, is connected to a maximum voltage terminal of serially-connected secondary batteries to be monitored. A second voltage source terminal, to which a second voltage is input, is connected to a minimum voltage terminal of the secondary batteries. A battery-voltage detecting unit outputs a detection signal based on a result of a voltage monitoring. A first reference-voltage generating unit receives the first and the second voltages as operating voltages, and generates a first reference voltage. A voltage converting unit receives the detection signal, and converts the detection signal received into either the first reference voltage or the second voltage. An output terminal outputs the detection signal converted, as an output detection signal.

Claims13

Dependent claims

A battery-voltage monitoring integrated-circuit that monitors a voltage of each of a specified-number of serially-connected secondary batteries, the battery-voltage monitoring integrated-circuit comprising:

a first voltage source terminal that is connected to a maximum voltage terminal of the secondary batteries to be monitored, a first voltage being input to the first voltage source terminal;
a second voltage source terminal that is connected to a minimum voltage terminal of the secondary batteries to be monitored, a second voltage being input to the second voltage source terminal;
a first input terminal to which an output detection signal is input;
a first reference-voltage generating unit that receives the first voltage and the second voltage as operating voltages, and generates a first reference voltage;
a second reference-voltage generating unit that receives the first voltage and the second voltage as operating voltages, and generates a second reference voltage;
a first voltage converting unit that receives the output detection signal, and converts the output detection signal received into either the first reference voltage or the second voltage;
a second reference-voltage output terminal that outputs the second reference voltage;
and
a first output terminal that outputs the output detection signal converted by the first voltage converting unit as an output detection signal, wherein
the first reference voltage is equal to or lower than the first voltage and equal to or higher than a voltage with which the first voltage converting unit can be operated, and
the second reference voltage is equal to or lower than a voltage obtained by subtracting the first reference voltage from the first voltage, and equal to or higher than the second voltage.

8 more elements

a first voltage source terminal that is connected to a maximum voltage terminal of the secondary batteries to be monitored, a first voltage being input to the first voltage source terminal;
a second voltage source terminal that is connected to a minimum voltage terminal of the secondary batteries to be monitored, a second voltage being input to the second voltage source terminal;
a clock input terminal to which a clock signal is input;
a data input terminal to which a data signal is input;
a first reference-voltage generating unit that receives the first voltage and the second voltage as operating voltages, and generates a first reference voltage;
a second reference-voltage generating unit that receives the first voltage and the second voltage as operating voltages, and generates a second reference voltage;
a first voltage converting unit that receives the clock signal, and converts the clock signal received into either the first voltage or the second voltage;
a second voltage converting unit that receives the data signal, and converts the data signal received into either the first voltage or the second voltage;
a flip-flop that accepts the data signal converted by the second voltage converting unit according to the clock signal converted by the first voltage converting unit;
a third voltage converting unit that the clock signal converted by the first voltage converting unit, and converts the clock signal converted by the first voltage converting unit received into either the first voltage or the second voltage;
a fourth voltage converting unit that receives the data signal converted by the second voltage converting unit, and converts the data signal converted by the second voltage converting unit received into either the first voltage or the second voltage;
a first control unit that controls a supply of the clock signal converted by the third voltage converting unit to a clock output terminal with the second reference voltage;
a second control unit that controls a supply of the data signal converted by the fourth voltage converting unit to a data output terminal with the second reference voltage;
and
a reference-voltage output terminal that outputs the first reference voltage.

12 more elements