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Sensors / Detectors: Amp Meters and Current Monitors

ISOLATED AC CURRENT MONITOR This circuit uses a small AC current transformer from Magnetek to produce an isolated voltage proportional to the AC current in the primary winding.  The transformer contains a single turn primary with a low 0.001-ohm resistance.  It can easily handle 30 amps of AC current and provides at least 500vac of isolation.  With the components shown, the output AC voltage is scaled so 1 amp of current produces 100mv of AC voltage.

 AC Line Current Detector: Active feedback IC serves as current sensing instrumentation amplifier: EDN-Design Ideas / High-speed current sensing presents a designer with some significant challenges. Most techniques for sensing current involve measuring the differential voltage the current produces as it flows through a sense element, such as a resistor or a Hall-effect device. The differential voltage across the sense element is generally small and is often riding on a common-mode voltage that is considerably .....Analog input circuit serves any microcontroller: EDN - Design Ideas /The simple ADC in Figure 1 is perfect for getting analog signals into a purely digital microcontroller. Using just five surface-mount parts, you can assemble it for less than 50 cents(1000), which is approximately half the cost of a single-chip-ADC approach in the same volume. Moreover, this design takes only one pin from the microcontroller to operate. .Circuit Breaker Monitors Leakage Current: EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit. Circuit measures currents in dc servo motor: EDN - Design Ideas / The simple circuit design in Figure 1 lets you measure all components of a current flowing in a dc servo motor. The rectified output of the circuit uses ground as a reference, so you can measure the output by using a single-ended A/D converter. The current-sense resistor, R1, has a value of 0. .Circuit Measures Small Current in DC Servo Motor: EDN-Design Ideas  Circuit Senses High Side Current: 03/01/01 EDN-Design Ideas / (One of several circuits in PDF) The accurate, high-side, current-sense circuit does not use a dedicated, isolated supply voltage, as some other schemes do. Current Sense Amplifier Handles High Voltages: EDN-Design Ideas Current Sense IC Prevents Over-current Damage: EDN-Design Ideas Current sensing scheme improves PFC on/off sequences: EDN - Design Ideas / PFC (power-factor-correction) preconverters typically use the step-up, or boost, configuration, because this type of converter is relatively easy to implement (Figure 1). However, this topology requires the output voltage to be higher than the input voltage. When this condition is not the case—for example, with on/off sequences or under load conditions—some inrush current flows thro....CurrentSensing for Crossbars: Maxim APP 391: - Current sharing between DC/DC converter modules enables several modules to be paralleled. In recent years, tight tolerances for current sharing have made discrete current-sense circuit designs a formidable challenge. This application note describes a low-cost, space-saving and accurate current sensing and sharing scheme using MAX4372. High Side Current Sensor has Period Output 1: Maxim APP 1084: High Side Current Sensor has Period Output 2: EDN-Design Ideas  /  PDF contains multiple circuits - scroll to find the one of interestHigh side current sensor monitors negative rail: EDN-Design Ideas / All dedicated current-sense amplifiers provide high-side sensing on a positive supply, but you can adapt such circuits for monitoring a negative supply (Figure 1). The positive-supply pin, V+, connects to the system's positive supply, and the ground pin, GND, connects to the negative supply, VEE. That arrangement monitors the negative supply and provides a positive output voltage for the extern..HighAccuracy CurrentSense Amplifier Enables Current Sensing and Current Sharing: Maxim APP 391: Mar 01, 2001 - Current sharing between DC/DC converter modules enables several modules to be paralleled. In recent years, tight tolerances for current sharing have made discrete current-sense circuit designs a formidable challenge. This application note describes a low-cost, space-saving and accurate current sensing and sharing scheme using MAX4372. Integrator Forms Picoammeter: EDN-Design Ideas MOSFET Current Sensing: Method of mirror current sensing a MOSFET Simple circuit provides high side current sensing: 10/12/00 EDN-Design Ideas / PDF contains multiple circuits - scroll to find this circuit Transmitter accurately transfers voltage input:EDN-Design Ideas /  When you connect remote sensors to a central process controller, a simple, robust, and commonly used interface is the 4 to 20-mA loop. The advantages of this current loop include the simplicity of just two twisted wires that share both power and signal, the loop's high noise immunity in harsh environments, and the de facto loop standard within the process-control industry...Two Sensors Measure Three Line Currents: EDN-Design Ideas Voltage Reference improves JFET: EDN-Design Ideas /  PDF contains multiple circuits - scroll to find this circuit The common JFET current-source in Figure 1a has average output impedance and depends heavily on the JFET's V P and I DSS variations. These manufacturing variations limit the initial accuracy of the current setpoint that the circuit can obtain with a...