A built-in relay state detection circuit

• Main Authors: YUAN JINJING, CAI CHUNLEI
• Format: Patent
• Language: English
• Published: 04.11.2015
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a built-in relay state detection circuit comprising a half-wave rectifying circuit, a resistance voltage-dividing circuit and a level converting circuit which are sequentially connected. The half-wave rectifying circuit detects voltage signals on the front end of a relay and converts the signals into direct current signals. The direct current signals go through the resistance voltage-dividing circuit to obtain sampling signals. The level converting circuit controls level converting based on a triode Q1. Which state a relay is in can be determined through detection of level signals of a collector electrode of the triode Q1. According to the invention, through detection of the signals on the front end of the relay, a purpose of detecting which state the relay is actually in can be reached; problems of possible misjudgment of states of the built-in relay due to indirect detection methods such as a method based on detection of auxiliary contact states are solved; maintenance of an intelligent ammeter is provided with great convenient; and contradictions such as electricity using disputes are avoided.