Optoelectronic isolation voltage measurement circuit

• Main Author: CUI JIMIN
• Format: Patent
• Language: Chinese; English
• Published: 14.09.2016
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The utility model discloses an optoelectronic isolation voltage measurement circuit, it includes opto -coupler chip U3, amplifier U4A, amplifier U5A, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, electric capacity C6 and diode Z1. The voltage that awaits measuring provides the power through current -limiting resistor R6 and diode Z1 formation stabilizing the voltage for amplifier U4A and opto -coupler chip U3, the voltage that awaits measuring through the partial pressure of R5 with R8, becomes the voltage that is directly proportional and concerns with the voltage that awaits measuring in amplifier U4A's non inverting input end relief, and this voltage carries out filtering by electric capacity C6, and amplifier U4A passes through opto -coupler chip U3 and realizes the negative feedback, and the voltage of feedback back stream input end is equal. Opto -coupler chip U3 is linear, and U5A's syntropy input voltage and U4A's reverse input end voltage equals in accepta