PROBLEM TO BE SOLVED: To provide a relay drive circuit that drives a relay by a constant current for reducing an excessive operation power and that has a simple and low-cost configuration.SOLUTION: A relay drive circuit 10 driving an on-vehicle relay 2 comprises: a switching element SW1 for making a current flow in a coil L1 of the relay 2; a current detection resistor RS detecting a current flowing in the coil L1; and a controller 11 controlling the switching element SW1. The controller 11 is configured to feed back the current detected by the current detection resistor RS to intermittently operate the switching element SW1, and to apply a constant current lower than a rated current applied at a rated voltage operation of the relay 2 to the coil L1 to drive the relay 2.
【課題】過剰な動作電力を低減する定電流によってリレーを駆動する、簡素で安価な構成のリレー駆動回路を提供する。【解決手段】車載用のリレー2を駆動するリレー駆動回路10は、リレー2のコイルL1に電流を流すスイッチング素子SW1と、コイルL1に流れる電流を検出する電流検出抵抗RSと、スイッチング素子SW1を制御する制御部11とを備え、制御部11は、電流検出抵抗RSが検出する電流をフィードバックしてスイッチング素子SW1を断続操作し、リレー2の定格電圧動作時に通電する定格電流より低い定電流をコイルL1に通電してリレー2を駆動するように構成した。【選択図】図1
ON-VEHICLE RELAY DRIVE CIRCUIT AND ON-VEHICLE EQUIPMENT
車載用リレー駆動回路および車載機器
2015-07-23
Patent
Elektronische Ressource
Japanisch
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