A static fault diagnosis circuit and diagnosis method for a three-phase full-bridge inverter
A three-phase full bridge, static fault technology, applied in the direction of instruments, measuring electricity, measuring electrical variables, etc., can solve the problems of burning power supply, pulling down the power grid, heating, etc., to enhance safety and maintainability, and ensure no faults The effect of starting
Active Publication Date: 2018-07-03
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
[0005] It is very dangerous to start the system without knowing the status of the three-phase full-bridge inverter. It is equivalent to short-circuiting the power grid, resulting in a large short-circuit current, which will instantly burn the inverter, or even pull down the power grid or burn out the power supply; if a single power device has a short-circuit fault or an open-circuit fault, it will cause the motor load to work in phase loss state, the phase current will be greater than the current under normal working conditions, and the heat will be serious, and long-term work will cause damage to the motor
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[0029] Now in conjunction with embodiment example, accompanying drawing, the present invention will be further described:
[0030] In order to verify the static fault diagnosis method of the three-phase full-bridge inverter, it is necessary to add the necessary detection circuit to the original basic hardware circuit, such as figure 1 shown.
[0031] The hardware detection circuit is composed of a detection circuit and a signal conditioning circuit. The detection circuit is to add four resistor divider networks and a bus current sampling resistor R on the basic topology of the three-phase full-bridge inverter. bus , each resistor divider network consists of three resistors (R x1 , R x2 with R x3 , where x=1, 2, 3, 4), and the corresponding positions of each group of resistor divider networks have the same resistance value of the corresponding resistors. In the specific example, the bus voltage is 28V. Considering the power supply of the post-stage operational amplifier circ...
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The invention relates to a static fault diagnosis circuit and diagnosis method of a three-phase full-bridge inverter. Only four simple resistor divider networks and one directly connected sampling resistor are needed in the circuit. Through comparing the output voltage of the divider networks and reference voltage, according to some specific decision rules, the detection and positioning of an open circuit fault and a short circuit fault can be realized. Whether the three-phase full-bridge inverter has an open circuit fault and a short circuit fault can be effectively and reliably diagnosed before system operation, and the fault state of a system can be determined before system starting. When the fault is detected, a machine is stopped and power is cut to carry out detection, if the system has the redundancy design for the three-phase full-bridge inverter, the redundancy switch can be carried out at first, the trouble-free starting is ensured, at the same time a certain reference is provided for subsequent maintenance, and the security and maintainability of the system are enhanced.
Description
technical field [0001] The invention relates to the field of fault diagnosis of an inverter circuit in power electronics, in particular to a static diagnosis circuit and a diagnosis method of a three-phase full-bridge inverter. Background technique [0002] Since General Electric Company developed the first thyristor in 1957, various new devices invented subsequently have continuously promoted the development of power electronics. As one of the important components of power electronics, the inverter circuit has also flourished. The development of the inverter circuit can be divided into two types according to the nature of the DC side power supply: voltage source inverter circuit and current source inverter circuit. The three-phase full-bridge inverter is a typical voltage source inverter Inverter (VSI) is widely used in motor systems and power conversion systems. According to statistics, 38% of motor drive system failures are caused by power devices, see literature: F.W.Fu...
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IPC IPC(8): G01R31/02
CPCG01R31/50
Inventor 马瑞卿张庆超李添幸
Owner NORTHWESTERN POLYTECHNICAL UNIV