ELECTRONIC DEVICE AND CURRENT MONITORING METHOD

• Main Authors: KAWAZOE KENICHI, ISHII YUJI, ONIMARU HIROSHI, RIKIMARU KENJI, ADACHI HIROSHI
• Format: Patent
• Language: English; Japanese
• Published: 02.02.2015
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To measure a current flowing from a power supply circuit into a receiver circuit.SOLUTION: In an electronic device, a detection circuit 5 detects a voltage difference generated at both ends of at least a partial wiring portion 2 of a power supply wiring 7 by a current flowing in the power supply wiring 7 connecting a power supply circuit 1 and a receiver circuit 3. A current supply circuit 4 supplies a pilot current to the power supply wiring 7. A control circuit 6 controls the supply of the pilot current and the stoppage of supply by the current supply circuit 4. The control circuit 6 calculates a wiring resistance value of the wiring portion 2 on the basis of a value of the voltage difference detected by the detection circuit 5 when the supply of the pilot current is stopped, a value of the voltage difference detected by the detection circuit 5 when the pilot current is supplied, and a current value of the pilot current. The control circuit 6 calculates the current value of a main current flowing from the power supply circuit 1 into the receiver circuit 3 on the basis of the value of the voltage difference detected by the detection circuit 5 when the supply of the pilot current is stopped and the wiring resistance value. 【課題】電源回路からレシーバ回路へ流れ込む電流を測定すること。【解決手段】電子装置において、検出回路５は、電源回路１とレシーバ回路３とを接続する電源配線７に流れる電流によって電源配線７の少なくとも一部の配線部分２の両端に生じる電圧差を検出する。電流供給回路４は、電源配線７にパイロット電流を供給する。制御回路６は、電流供給回路４に対してパイロット電流の供給及び供給停止を制御する。制御回路６は、パイロット電流の供給停止時に検出回路５によって検出される電圧差の値、パイロット電流の供給時に検出回路５によって検出される電圧差の値、及びパイロット電流の電流値に基づいて、配線部分２の配線抵抗値を算出する。制御回路６は、パイロット電流の供給停止時に検出回路５によって検出される電圧差の値、及び配線抵抗値に基づいて、電源回路１からレシーバ回路３に流れ込む主電流の電流値を算出する。【選択図】図１