Purdue University ECET 257 Power & RF Electronics
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1 Amplifier Protection 1
2 Overview 2 Over Current Protection Hall Effect Sensor Current Limiting Temperature Sensor Case temperature IC switch
3 Over Current Protection ti HllEff Hall Effect tsensor 3 ACS712ELCTR-05B-T T r IP+toIP IP+ to IP = Ω V = 0 = 2.5 V Sensitivity = 185 mv/a / /P t /P t /0712/0712 df
4 Over Current Protection ti HllEff Hall Effect tsensor 4 ACS712ELCTR-05B-T I P+ & I P- isolated from V cc, V out, & GND Pins 3 & 4 = I out Pins 1 & 2 = I in Filter: t rise = 0.35/f -3dB f -3dB = 20 khz / /P t /P t /0712/0712 df C f =? f
5 Over Current Protection ti Signal Processing 5
6 Over Current Protection ti Signal Processing 6 25V V 0.7
7 Over Current Protection ti Signal Processing V V TTL low = Too much I ECET 107, V 3.2 V reference 50 mv hysteresis
8 Over Current Protection ti Signal Processing 8 TTL low = Too much I Retriggerable one-shot or RS Flip flop? How do you reset? ECET 109, 159, 209 Too much I 0.5 sec delay
9 Over Current Protection ti Signal Processing 9 High side switch LED or Logic control of power supply ECET 257 Too much I 0.5 sec delay
10 Over Current Protection ti Signal Processing 10 Atmel microcontroller Purdue University ECET 257 Power & RF Electronics
11 Over Current Protection ti Signal Processing 11 PLD
12 Current Limiting - performance 12 V load low voltages out => whatever current R load needs R load smaller I load I sc
13 Current Limiting - performance 13 V load low voltages out => whatever current R load needs I demand too high R load smaller I load I sc
14 Current Limiting - performance 14 V load low voltages out => whatever current R load needs R load smaller I sc I load I demand too high => I load limited to I SC
15 Current Limiting - performance 15 V load low voltages out => whatever current R load needs R load smaller I sc I load I demand too high => I load limited to I SC &V load dropped as set by R load
16 Current Limiting - performance 16 V load low voltages out => whatever current R load needs R load smaller I sc I load I demand too high => I load limited to I SC &V load dropped as set by R load V load = I sc * R load
17 Current Limiting - performance 17 V load low voltages out => whatever current R load needs R load smaller I sc I load I demand too high => I load limited to I SC &V load dropped as set by R load V load = I sc * R load constant
18 18 Current Limiting iti - Positive side schematic R sc small 0.x Ω normal operation I load < I SC Q2 off => no effect
19 19 Current Limiting iti - Positive side schematic R sc small 0.x Ω normal operation I load < I SC Q2 off => no effect I load => V Rsc
20 20 Current Limiting iti - Positive side schematic R sc small 0.x Ω normal operation I load < I SC Q2 off => no effect I load => V Rsc V R sc = 0.7V =>
21 21 Current Limiting iti - Positive side schematic R sc small 0.x Ω normal operation I load < I SC Q2 off => no effect I load => V Rsc V R sc = 0.7V => Q2 on => Q1 V GS shorted
22 22 Current Limiting iti - Positive side schematic R sc small 0.x Ω normal operation I load < I SC Q2 off I load => no effect => V Rsc V R sc = 0.7V => Q2 on => Q1 V GS shorted Q1 off => I load Purdue University ECET 257EET 257 Power & RF Electronics
23 23 Current Limiting iti - Positive side schematic R sc small 0.x Ω normal operation I load < I SC Q2 off I load => no effect => V Rsc V R sc = 0.7V => Q2 on => Q1 V GS shorted Q1 off => I load Purdue University ECET 257 EET 257 Power & RF Electronics
24 Current Limiting - Problem 24 V supply = 30V R load = 8Ω V load max = 20V P T A = 50 o C Θ 75 JA = 7.5 o C/W I SC =? R SC =? P Q shorted load =? T J =? I SC >V load P /R load > 20V P / 8Ω = 2.5A P pick iki sc = 28A 2.8A R SC = 0.7V/ 2.8A = 0.25Ω P Q short = (30V * 2.8A) / 2 = 42W T J = 50 o C + 42W * 7.5 o C/W = 365 o C => smoke!
25 Current Limiting - Problem 25 V supply = 30V R load = 8Ω V load max = 20V P T A = 50 o C Θ 75 JA = 7.5 o C/W I SC =? R SC =? I SC >V load dp /R load pick I sc = 2.8A T J = 365 o C => smoke! Why does it not burn up when the load is not shorted? P Q shorted load =? What are we going to do? T J =?
26 Overview 26 Current Limiting performance positive side schematic operation problem Temperature Sensor Case temperature IC switch
27 Temperature Switch 27 T J = T S+ P( ( JC+ CS ) T= T P( + ) Θ Θ Heat sink temperature =? Θ Θ Temperature switch 130 MAX ºC C 19.5W1.9 C + = 0.2 C W W 89 C T < 95ºC => output open C 3.3kΩ pullup to 5V T C >95ºC => output low Hysteresis pin V+ => 10ºC 85 ºC to go high Mounting? S J JC CS T S = Purdue University ECET 257 Power & RF Electronics
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