PROBLEM TO BE SOLVED: To synchronize the timing when respective semiconductor switching elements, on a plurality of wires for supplying power to a load, are turned off based on the temperatures of each wire to interrupt power supply.SOLUTION: When supplying power from a power supply B to a load 3 via a parallel circuit 5 of two wires 51, 52 having the wiring resistances equal to each other, and the passing currents flowing through the semiconductor switching elements (a) on respective wires 51, 52 are measured by the current measurement units (b) of IPD131, 132. In order to match the temperatures of respective wires 51, 52 estimated from the measured current in a current temperature estimation unit 115a, a target duty ratio of PWM control for reducing the passage current of the semiconductor switching element (a) in the IPD131 on the wire 51 is calculated in a target Duty ratio calculation unit 115b, and the semiconductor switching element (a) of the IPD131 is turned on/off by a PWM/DC control and interruption determination unit 112.SELECTED DRAWING: Figure 2
【課題】負荷に電力を供給する複数の電線上の各半導体スイッチング素子が各電線の温度に基づいてオフして電力供給を遮断するタイミングを同期させる。【解決手段】配線抵抗が互いに等しい2つの電線51,52の並列回路5を介して電源Bから負荷3に供給するのに当たり、各電線51,52上の半導体スイッチング素子aをそれぞれ流れる通過電流をIPD131,132の電流測定部bで測定し、測定電流から現状温度推定部115aで推定した各電線51,52の温度を一致させるために、電線51上のIPD131の半導体スイッチング素子aの通過電流を減らすPWM制御の目標デューティー比を目標DUTY比算出部115bで算出し、算出した目標デューティー比でIPD131の半導体スイッチング素子aをPWM/DC制御及び遮断判定部112によりオンオフさせる。【選択図】図2
POWER SUPPLY CONTROLLER FOR VEHICLE
車両用電源制御装置
2016-12-08
Patent
Electronic Resource
Japanese
European Patent Office | 2018
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