A bidirectional overvoltage detection and protection module
A protection module and overvoltage detection technology, applied in emergency protection circuit devices, electrical components, etc., can solve problems such as device parameter dispersion, thyristor failure to conduct, thyristor component damage, etc.
Active Publication Date: 2019-01-04
INST OF PLASMA PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
Due to the inconsistency of the parallel branch parameters of each thyristor and the scattered characteristics of device parameters, when triggering parallel multi-thyristors, if the pulse width is too narrow, some parallel thyristors will not be able to conduct, so that a small number of conducting thyristors will suffer from Damaged by overload current; when the ITER poloidal field converter operates in four quadrants, there may be positive or negative voltage at both ends of any converter
Therefore, the existing overvoltage detection and protection methods are not suitable for series overvoltage detection and protection of ITER poloidal field converters. very important
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[0019] Such as figure 2 As shown, a bidirectional overvoltage detection and protection module uses four high-voltage fast recovery diodes D3, D4, D5, and D6 to form a rectifier bridge to merge the polarities of the detected voltage signals, and the merged voltage signals pass through the current limiting resistor R6 in turn. , BOD device, sampling resistor R7, and Zener diode D7 to obtain an overvoltage signal, wherein the current limiting resistor R6, the BOD device and the sampling resistor R7 are connected in series, and the sampling resistor R7 is connected in parallel with the Zener diode, and the obtained overvoltage signal is passed through single harmonic oscillation The wide pulse signal is widened by the device 1, and then the wide pulse signal is frequency modulated by the subsequent frequency modulation circuit 2, and finally the signal is sent to the bypass thyristor trigger unit through the trigger pulse output circuit 3, so as to realize the automatic detection ...
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The invention provides a bidirectional overvoltage detection protection module. Four high-voltage fast recovery diodes D3, D4, D5 and D6 form a rectifier bridge to merge the polarity of detected voltage signals. The merged voltage signal successively passes through a current limiting resistor R6, a BOD device, a sampling resistor R7 and a zener diode D7 to acquire an overvoltage signal. The current limiting resistor R6, the BOD device and the sampling resistor R7 are connected in series. The sampling resistor R7 is connected in parallel with the zener diode. The acquired overvoltage signal is broadened to a wide pulse signal through a single harmonic oscillator. According to the invention, four high-voltage fast recovery diodes form the rectifier bridge to merge the polarity of the detected voltage signals to realize bidirectional voltage detection; the single harmonic oscillator is used to broaden the pulse width of the original overvoltage signal; a frequency modulation circuit is used to carry out frequency modulation on the wide pulse signal; and the signal can reliably trigger a protection device to realize overvoltage protection.
Description
technical field [0001] The invention relates to the technical field of application of power electronic devices, in particular to a bidirectional overvoltage detection and protection module. Background technique [0002] The ITER (International Thermonuclear Experimental Reactor) program is the largest international scientific and technological cooperation program in the world today. The poloidal field converter power supply system is one of the important subsystems of ITER, which provides the necessary engineering foundation and control for the generation, confinement, maintenance, heating and control of plasma current, position, shape, distribution and rupture of plasma means. The poloidal field converter equipment is an ultra-high-power thyristor phase-controlled converter with a single unit capacity of 60MW, and the installed capacity of the entire system is as high as 4600MW. Some power systems in the poloidal field converter system require three sets of four-quadrant ...
Claims
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IPC IPC(8): H02H7/125
CPCH02H7/1252
Inventor 黄连生陈晓娇傅鹏高格王泽京何诗英
Owner INST OF PLASMA PHYSICS CHINESE ACAD OF SCI