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Schaltplan Strommessung und Offset-Spannung
C4 10n/250V, R14 1k, GND, Strommessung, C15 220p/50V, R40 300k 0.1%, BATT_EXT, C9 1u/50V, GND, U1A OPA4191, R43 47R, LOAD_CURR, Strom 5mV/A am Ausgang V=20 -> 100 mV, R42 15a 0.1%, D20 BAT46WJ, BATT_EXT, D21 BAT46WJ, D23, R47 15k 0.1%, BAT46WJ, GND, D24, C17 220p/50V, GND, Erzeugung Offset-Spannung, +5V, C28 100u/16V, GND, C30 1u/16V, GND, C18 100u/16V, GND, R39 3k, U2A TLV9004, R48 37k4, R50 931R, 922 5V1, GND, R49 22R, ca. 99.5 mV
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Oszilloskop-Messung instabiler Stromregelung
OWON VDS1022 Stop instable current regulation U304 saturates at 3.3V no current medium current for 1 full wave medium current for 1 full wave high current for 1 full wave no current for 3 full waves medium current for 1 full wave high current for 1 full wave CH1 2.06 V CH2 39 mV? Period 19.98 ms 31.94 ms DC 500 mV/div DC 50 mV/div -6.553 Hz 0.04 div? 39.37 Hz 72.4% 260.8° at 37V U_DC. at 100% PWM for current-faking with 2xPC817 on 100ohm parallel to R326, yellow: AC-current, 500mA/div red: U304 out M 10ms/div T 0.0 ns S 5k (25KS/S)
