Inductor current synthesizer for switching power supplies
a current synthesizer and switching power supply technology, applied in the direction of electric variable regulation, process and machine control, instruments, etc., can solve the problems of additional circuit loss and sense resistor occupying spa
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[0071] Assume A / D converter 32 is 10 bits. A / D converters 40 and 42 are 8 bits.
2 Switching frequency f.sub.s: 300 Khz, Switching period T.sub.s: 3.33 microseconds Inductor L.sub.1: 800 nH HF Clock: 10 MHz, Q2 on resistance R.sub.dson: 6 milliohms Input voltage V.sub.in: 20 Volts Output voltage V.sub.out: 1.3 Volts I.sub.L1 = 20 A Inductor ripple current: 5 A
[0072] n: 10 bits for A / D converter 32 and 8 bits for A / D converters 40 and 42 Input of A / D converter 32 when Q2 is conducting is:
V.sub.SW=R.sub.dson.times.I.sub.L1 (1)
V.sub.SW=0.006*20 A=120 mV
[0073] Voltage to Current scaling is 100 mV / A A / D converter 32 will output 120 counts at 1.024v Full Scale. 10 Count / Amp =120 count 20 A = 6 counts / Amp
[0074] At the ripple generator, 25.5 volts Full Scale for an 8 bit A / D. Number of counts to maintain 5 A peak to peak ripple:
C.sub.ripple=5 A.times.6 count / A=30 counts (2)
[0075] Each clock cycle will provide C.sub.clk counts 11 Count ch = ( V in - V out ) L 1 .times. 1 HF = 2.34 A / clk ...
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