Voltage detection circuit and method thereof

A voltage detection circuit, comprising:

• a plurality of even-number voltage detection nodes including a first even-number voltage detection node and a second even-number voltage detection node;
• at least an odd-number voltage detection node including a first odd-number voltage detection node;
• a voltage differential generation circuit;
• a selection circuit controlling the connection relation of the voltage differential generation circuit, the plurality of even-number voltage detection nodes and the at least one odd-number voltage detection node, so as to output the voltages of the first even-number and first odd-number voltage detection nodes to the voltage differential generation circuit which thereby generates a first voltage differential and output the voltages of the first odd-number and second even-number voltage detection nodes to the voltage differential generation circuit which thereby generates a second voltage differential;
• and
• a computing circuit receiving the first and second voltage differentials while the voltage of the first even-number voltage detection node is a reference voltage or derived from the reference voltage and thereby known to the computing circuit, the computing circuit obtaining the voltage of the first odd-number voltage detection node according to the first voltage differential and the voltage of the first even-number voltage detection node and obtaining the voltage of the second even-number voltage detection node according to the second voltage differential and the voltage of the first odd-number voltage detection node,
• wherein the voltage differential generation circuit further receives an offset voltage to make sure that the first and second voltage differentials are with the same signs.