Patent ID: 9225242
Filing Date: 2015-12-29
Classification: H02M

Abstract:
1. An electronic control device comprising a voltage converter and a control processor operating by receiving an electric power supplied from the voltage converter, the voltage converter including: a switching element switching a direct-current power supplied from a direct-current power source; a smoothing circuit smoothing the direct-current power switched by the switching element and outputting a smoothed direct-current power; a voltage control circuit generating a control signal based on the smoothed direct-current power output from the smoothing circuit; a driving circuit driving the switching element based on the control signal; and a turn-on restriction section capable of performing a restriction operation to restrict a turn-on speed of the switching element, wherein the turn-on restriction section includes a comparator, the comparator receives a voltage of a main terminal of the switching element connected to the smoothing circuit and determines whether the voltage of the main terminal of the switching element reaches a threshold voltage, wherein the turn-on restriction section performs the restriction operation for a predetermined time after a start of a turn-on period in which the switching element is turned on, and the turn-on restriction section stops the restriction operation after the predetermined time has elapsed, wherein the smoothing circuit includes an element connected to the main terminal of the switching element and having a parasitic capacitance, wherein the parasitic capacitance decreases with increase of the voltage of the main terminal of the switching element, and wherein the predetermined time is set to a time from the start of the turn-on period until the voltage of the main terminal of the switching element reaches the threshold voltage.