Self-diagnosis circuit and method for main circuit of frequency converter

• Main Authors: MEI JIANHUA, ZHANG XIAN, DOU KAI
• Format: Patent
• Language: Chinese; English
• Published: 29.01.2021
• Subjects: MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention discloses a self-diagnosis circuit and method for a main circuit of a frequency converter. The method comprises the steps of firstly enabling a bus voltage isolation sampling unit of thefrequency converter or a servo driver to detect the voltages of a positive electrode P end of a main circuit DC bus and a negative electrode N end of the main circuit DC bus, and transmitting an equal-proportion analog quantity signal VPN to a microprocessor control unit after linear isolation, and then enabling the microprocessor control unit to receive the VPN signal, performing judgment according to the state of the VPN signal, and sending a corresponding regeneration unit driving signal DRIVE. Meanwhile, the state detection unit detects the voltage of the C end of the main circuit and thevoltage of the B end of the main circuit, after isolation, a digital signal STATE is sent to the microprocessor control unit, and after the microprocessor control unit receives the STATE signal, thestates of the pre-charging