断路器处理电压76V-Circuit Breaker Han
abstract: a current-sense amplifier, comparator, external cmos switch, and an external transistor can be used to create a circuit breaker.
the simplicity of low-side current monitoring can mask the advantages of a high-side approach. you can monitor load currents in a power supply, a motor driver, or another power circuit on either the high or the low side (ground). however, you should not let the ease of low-side monitoring cause you either to overlook its dangers or the advantages of a high-side approach.
various fault conditions can bypass the low-side monitor, thereby subjecting the load to dangerous and undetected stresses. however, a high-side monitor connected directly to the power source can detect any downstream failure and trigger the appropriate corrective action. traditionally, such high-side monitors required a precision op amp, a boost power supply to accommodate the op amp's limited common-mode range, and some precision resistors. now, the max4080 ic can sense high-side currents in the presence of common-mode voltages as high as 76v (figure 1).
in this application circuit the max4080, ic1, provides a ground-referenced voltage-source output proportional to the high-side current of interest. this output voltage is proportional to the voltage across an external sense resistor multiplied by five.
figure 1. a current sense amplifier, comparator, and a few external components form a low-cost circuit breaker.
ic1, ic2, and a few external parts form a low-cost circuit breaker. rsense senses load currents, and q1 controls the currents. the design accepts inputs of 4.5v to 76v. the initial application of vin and vdd places the breaker in its trip state. pressing s1 resets the breaker and connects power to the load and ic1, thereby activating q1. when the voltage across rsense is multiplied by five and exceeds 1.2v, then ic2 outputs a low signal on cout which turns off q2 and q1. press s1 to reset the breaker.
reprinted from edn magazine may 25, 2000.
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断路器处理电压76V-Circuit Breaker Han
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the simplicity of low-side current monitoring can mask the advantages of a high-side approach. you can monitor load currents in a power supply, a motor driver, or another power circuit on either the high or the low side (ground). however, you should not let the ease of low-side monitoring cause you either to overlook its dangers or the advantages of a high-side approach.
various fault conditions can bypass the low-side monitor, thereby subjecting the load to dangerous and undetected stresses. however, a high-side monitor connected directly to the power source can detect any downstream failure and trigger the appropriate corrective action. traditionally, such high-side monitors required a precision op amp, a boost power supply to accommodate the op amp's limited common-mode range, and some precision resistors. now, the max4080 ic can sense high-side currents in the presence of common-mode voltages as high as 76v (figure 1).
in this application circuit the max4080, ic1, provides a ground-referenced voltage-source output proportional to the high-side current of interest. this output voltage is proportional to the voltage across an external sense resistor multiplied by five.
figure 1. a current sense amplifier, comparator, and a few external components form a low-cost circuit breaker.
ic1, ic2, and a few external parts form a low-cost circuit breaker. rsense senses load currents, and q1 controls the currents. the design accepts inputs of 4.5v to 76v. the initial application of vin and vdd places the breaker in its trip state. pressing s1 resets the breaker and connects power to the load and ic1, thereby activating q1. when the voltage across rsense is multiplied by five and exceeds 1.2v, then ic2 outputs a low signal on cout which turns off q2 and q1. press s1 to reset the breaker.
reprinted from edn magazine may 25, 2000.
四会富仕拟投8000万用于5G通信电路板项目
OLED电视能否靠得住看了就知道
“互联网+废品进行回收”模式的优势是什么
太阳能电池的结构和制造技术
人工智能市场泡沫浮现，智能名片的商业红利还会持续多久？
断路器处理电压76V-Circuit Breaker Han
黄教主“真身”引爆黑科技，超强GPU、DPU、最快网卡芯片，打造未来“虚拟世界”
游戏食堂：一个让你爱上玩游戏的平台
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无人值守自动气象站的功能特点是怎样的
如何定义一台好的液晶广告机，未来它将如何发展
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果品检测仪器能够在一定程度上确保果品质量安全
NLS-EM25二维码扫描模组形象，二维扫描模组适合哪些场所应用
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预言机的发展是否会影响区块链的发展
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