POWER CONTROL DEVICE AND SWITCHING POWER SUPPLY

To prevent the disabled operation of a power control device having the charge voltage of a capacitor as a power source.SOLUTION: A power control device 100 includes: an initiation circuit 130 which, when it is switched on, charges a capacitor connected to a second node Vcc with a full-wave rectification voltage input to a first node VH; and a control circuit 110 which switches on the initiation circuit 130 in the case where a voltage of the second node Vcc is decreased, on detection that the voltage of the second node Vcc is increased to reach a third voltage after the voltage of the second node Vcc is decreased to be lower than a second voltage, and that a voltage of the first node VH is lower than a first voltage value. The control circuit 110 switches on the initiation circuit 110 on detection that the voltage of the second node Vcc has become lower than a fourth voltage which is lower than the second voltage, even if the voltage of the first node is not detected to be lower than the first voltage.SELECTED DRAWING: Figure 2 【課題】コンデンサーの充電電圧を電源とする電源制御装置の動作不能を防ぐ。【解決手段】電源制御装置１００は、第１ノードＶＨに入力された全波整流電圧を第２ノードＶｃｃに接続されたコンデンサーに、オンによって充電させる起動回路１３０と、第２ノードＶｃｃの電圧が低下する場合に第２電圧未満となってから第２ノードＶｃｃの電圧が上昇して第３電圧に達したと検出された場合であって、かつ、第１ノードＶＨの電圧が第１電圧値未満であると検出された場合に、起動回路１３０をオンさせる制御回路１１０と、含む。制御回路１１０は、第２ノードＶｃｃの電圧が第２電圧よりも第４電圧未満となったと検出された場合、第１ノードの電圧が第１電圧未満であると検出されていなくても、起動回路１１０をオンさせる。【選択図】図２