POWER SUPPLY DISCHARGE CIRCUIT

PROBLEM TO BE SOLVED: To provide a discharge circuit capable of eliminating complicated control for establishing a power supply off-sequence and reducing the number of components and a component mounting area in a multi-power supply circuit.SOLUTION: The power supply discharge circuit, having a multi-power supply circuit and executing discharge processing according to a predetermined power supply off-sequence regarding a power supply node to be discharged, includes: a discharge circuit (5) connected with one power supply node to be discharged to execute discharge by changing over a switch to a closed state; opening and closing operation part (2) provided between respective power supply nodes and set to be under a closed state according to the power supply off-sequence to connect any other voltage node than one power supply node with the discharge circuit for execution of discharge; and a discharge control circuit (6) for establishing the power supply off-sequence and executing discharge processing by changing over a switch in the discharge circuit to a closed state.SELECTED DRAWING: Figure 1 【課題】多電源回路において、電源オフシーケンスを確立させるための複雑な制御を必要とせずに、かつ、部品点数および部品実装面積を削減することができる放電回路を得る。【解決手段】多電源回路を有し、放電対象となる電源ノードに関して、あらかじめ決められた電源オフシーケンスに従って、放電処理を実行する電源放電回路であって、放電対象となる１つの電源ノードに接続され、スイッチが閉状態に切り換えられることで放電を実行する放電回路（５）と、各電源ノード間に設けられ、電源オフシーケンスに従って閉状態となることで、１つの電源ノード以外の電圧ノードを放電回路に接続させることで放電を実行する開閉動作部（２）と、放電回路内のスイッチを閉状態に切り換えることで、電源オフシーケンスを確立させて放電処理を実行する放電制御回路（６）とを備える。【選択図】図１