| 摘要 |
Provided is a current detection circuit that can detect current in a wide dynamic range, with high precision, and with a good step response. Voltage that is generated between both ends of a resistor (R12) connected between a high-voltage power supply (1) and a load (2) is amplified by amplifiers (31, 32) and compared, by comparators (51, 52), to the voltage of a saw-tooth wave signal; the lengths T2, T3 of signals indicating the comparison results from the comparators (51, 52) during an inclined period in which the voltage of the saw-tooth wave signal linearly and gradually increases or decreases and the length T1 of the inclined period are detected; and the current flowing to the resistor (R12) is detected on the basis of the ratio between the detected lengths. |
