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Characterization and detection of intermediate frequency furnace and -IGBT module
Intermediate frequency furnace -IGBT
1 common -IGBT module of intermediate frequency furnace.
Intermediate frequency furnace -IGBT module is divided intoone-way medium frequency furnace -IGBT module, -IGBT moduleof two-way medium frequency furnace. One-way medium frequency furnace -IGBT module with A, K, control of anodecathode pole G three pin. Double medium frequency furnace -IGBT module has a first anode, the second anode A1 (T1) A2(T2), control G three pin.
Only when there is a positive voltage is applied between the one-way medium frequency furnace of anode and cathode module of -IGBT A K, and G and between the cathode and thediscipline is required to forward the trigger voltage, canbe triggered and conducted. At this time A, K is a low resistance conducting anode and cathode of A shape, Kpressure drop is about 1V. Oneway intermediate frequencyfurnace -IGBT module is turned on, the discipline is G evenget trigger voltage, anode and cathode only between A Kremained positive voltage, one-way medium frequency furnace-IGBT module continued in a low resistance conducting shape.Only when the anode voltage of A or A, the cathode anodeundo K voltage polarity produce rotation (AC zero), one-way medium frequency furnace -IGBT module that is composed of a low resistance conducting form into high resistance toshape. One-way medium frequency furnace -IGBT module oncestop, even if the anode and cathode of A between the K and the new together with the forward voltage, still need tocontrol G and K between the cathode from the new andpositive trigger voltage can be conducted. Oneway intermediate frequency furnace -IGBT module conduction and closed containment form the equivalent of switching and off state, it can be made into a contactless switch.
Double medium frequency furnace -IGBT module first anode A1 and second anode A2, whether the voltage polarity ispositive or negative, only need to control the pole G and the first anode A1 with positive and negative polaritydifferent trigger voltage, can trigger a low resistance state. At this time A1, A2 pressure drop is about 1V.Double medium frequency furnace -IGBT module onceconduction, even lost the trigger voltage, can continue tomaintain the conduction shape. Only when the first anode,the second anode A1 A2 current decreases, less than the holding current or A1, A2 when the voltage polarity rotationand no trigger voltage, two-way medium frequency furnace -IGBT module was truncated, now only from the trigger voltage can be conducted.
Detection of 2 one-way medium frequency furnace -IGBT module.
Multimeter selected R*1 resistor block, with red, black twoprobes are respectively measured between any two pin isreverse resistance to find reading as a pair of pin tens ofohms, at this time the black pen pins to control G, the red pen pinout as the cathode of K, another empty foot as theanode A. The black pen is connected to the anode of A has been strengthened, the red pen is connected with the cathodeK. The multimeter pointer should not move. Use short momentshorted anode A and control G, the multimeter electricintercept pointer should be deflected to the right, 10 ohmresistance readings for mercy. Such as anode A is connected to the black pen, cathode K of the red pen, producedeflection meter pointer, the one-way medium frequencyfurnace -IGBT module has breakdown defeat is not good.
Detection of 3 two-way medium frequency furnace -IGBT module.
Using a multimeter R*1 resistor block, measuring any two pinbetween positive and negative resistance with red, black twopen parting, whether the two readings as infinite. If a group of tens of ohms, the group of red, black list the two pin for the first anode A1 and containing G, another footis the second anode A2. To A1, G, and A1, G asmeasurement between positive, reverse resistance, reading relative smaller that measurement of the black pen the pin for the first anode A1, the red pen the pin for disciplining pole G. The black pen connected to the secondanode A2 has been determined, the red pen with the firstanode A1, the multimeter pointer should not deflect, the resistance is infinite. And then with a short connection A2,G instant short circuit to G, with positive trigger voltage, A2, A1 resistance of about 10 ohms control. Thendisconnect A2, G short connection, multimeter readingshould be 10 ohms. For the red, the black pen wiring, the red pen connected to the second anode A2, black probe connected to the first anode A1. Strange multimeter pointer should not attack deflection, resistance is infinite. With short wires will A2, G pole again instant short circuit toG, and a negative trigger voltage, A1, A2 between the resistance is 10 ohms around. Then disconnect A2, G veryshort wiring, multimeter reading should be stubborn,maintained at about 10 ohms. With the above rules, clarifythe measured bidirectional intermediate frequency furnace -IGBT modules are not damaged and three pin polarity judgmentrough.
Detection of high power -IGBT module of intermediate frequency furnace, need to use the table black pen is connected in series with a 1.5V dry cell batteries inmillion, marching in a trigger voltage.
Thyristor (intermediate frequency furnace -IGBT module) pinidentification
Thyristor foot differential use the following way: first usemultimeter R*1K gear measuring a resistance value between,the resistance of small feet leave for Discipline pole and the cathode, the left foot as anode. Then the multimeter is placed in the R*10K block, pinch the anode and another footwith your fingers, and do not let the feet contact, the black pen is connected to the anode, the red pen with leftfoot, such as the right swing, the red pen are connected to the cathode, no swing is to contain very.