Title:
PWM SIGNAL DETECTION CIRCUIT
Document Type and Number:
Japanese Patent JP2018093385
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a PWM signal detection circuit capable of accurately detecting a pulse width of an origin PWM signal.SOLUTION: An output circuit 12 of a master ECU outputs a PWM signal S1 from an output transistor 13. An input circuit 22 of a slave ECU 20 receives an input signal S2 via a signal line L. A level of the signal S2 pulled up by an on-vehicle power supply VB is converted into a signal S3 of a DC power supply VD via a diode 25. The signal S3 is input to an inverted input terminal of a comparator 26 as a signal S4 via a resistor 27, and input to a non-inverted input terminal as a signal S5 via a low-pass filter 28. The comparator 26 can obtain an output signal S6 at an edge timing when a level of the PWM signal S1 is changed, by means of the signal S5 delayed by the low-pass filter 28.SELECTED DRAWING: Figure 1
Inventors:
SUGIE TAKUYA
KURODA TAKAO
KURODA TAKAO
Application Number:
JP2016235878A
Publication Date:
June 14, 2018
Filing Date:
December 05, 2016
Export Citation:
Assignee:
DENSO CORP
International Classes:
H03K9/08; H03K5/153; H03K19/0175; H04L25/49
Attorney, Agent or Firm:
Patent Business Corporation Sato International Patent Office