Thyristor Semiconductor Products Page 50 Thyristor

2014 Littelfuse, Inc. Specifications are subject to change without notice. Revised: 12/14/14 Teccor brand Thyristors AN1006 Power Rectifiers The rectifier is a unidirectional device which conducts when forward voltage (above 0.7 V) is applied. To connect the rectifier: 1. Connect Anode to Collector Terminal (C). 2. Connect Cathode to Emitter Terminal (E). To begin testing, perform the following procedures. Procedure 1:V RRM and I RM To measure the V RRM and I RM parameter: 1. Set Variable Collector Supply Voltage Range to 1500 V. ( 2000 V on 370 ) 2. Set Horizontal knob to sufficient scale to allow viewing of trace at the required voltage level ( 100 V/DIV for 400 V and 600 V devices and 50 V/DIV for 200 V devices ) . 3. Set Mode to Leakage . 4. Set Vertical knob to 100 A/DIV. (Due to leakage setting, the CRT readout will be 100 nA per division.) 5. Set Terminal Selector to Emitter Grounded-Open Base. 6. Set Polarity to (-). 7. Set Power Dissipation to 2.2 W. ( 2 W on 370) 8. Set Left-Right Terminal Jack Selector to correspond with location of test fixture. 9. Increase Variable Collector Supply Voltage to the rated V RRM of the device and observe the dot on the CRT. Read across horizontally from the dot to the vertical current scale. This measured value is the leakage current. (Figure AN1006.2) V RRM I RM 100 nA 100 V E R T H O R I Z S T E P Figure AN1006.2 I RM = 340 nA at V RRM = 600 V Procedure 2:V FM Before testing, note the following: Kelvin fixture is not used, an error in measurement of VFM will result due to voltage drop in fixture. If a Kelvin fixture is not available, Figure AN1006.3 shows necessary information to wire a test fixture with Kelvin connections. model 576, V FM cannot be tested at rated current without a Tektronix model 176 high-current module. The procedure below is done at I T(RMS) = 10 A (20 A PK ). This test parameter allows the use of a standard curve tracer and still provides an estimate of whether V FM is within specification. SOCKET SOCKET PINS One set of pins wired to Collector (C), Base (B), and Emitter (E) Terminals The pins which correspond to the anode and cathode of the device are wired to the terminals marked C SENSE (MT2/Anode) and E SENSE (MT1/Cathode). The gate does not require a Kelvin connection. Socket used must have two sets of pins Figure AN1006.3 Instructions for Wiring Kelvin Socket To measure the V FM parameter: 1. Set Variable Collector Supply Voltage Range to 15 Max Peak Volts. ( 16 V on 370 ) 2. Set Horizontal knob to 0.5 V/DIV. 3. Set Mode to Norm. 4. Set Vertical knob to 2 A/DIV. 5. Set Power Dissipation to 220 W ( 100 W on 577 ) . 6. Set Polarity to (+). 7. Set Left-Right Terminal Jack Selector to correspond with location of test fixture. 8. Increase Variable Collector Supply Voltage until current reaches 20 A. WARNING: Limit test time to 15 seconds maximum. To measure V FM , follow along horizontal scale to the point where the trace crosses the 20 A axis. The distance from the left-hand side of scale to the crossing point is the V FM value. (Figure AN1006.4) Note: Model 370 current is limited to 10 A. Thyristor and Rectifier Testing Using Curve Tracers (continued)

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