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Application Scenario: Isolated AC Voltage Sensing
In this application, we will employ the PC81713NIP1H to sense an AC voltage and provide electrical isolation between the sensing circuit and the monitoring circuit. This is crucial in situations where safety, noise immunity, or voltage level differences need to be considered.
Circuit Connection:
To create an isolated AC voltage sensing circuit, follow these detailed steps:
1. Input Side (Voltage Sensing):
- Connect one terminal of the AC voltage source (e.g., mains power) to the anode (A) of the PC81713NIP1H's internal LED.
- Connect the other terminal of the AC voltage source to the ground (GND) of the voltage sensing circuit.
- To limit the LED current, insert a current-limiting resistor (R1) between the anode (A) of the LED and the AC voltage source. Ensure that the resistor value meets the LED's forward voltage and current specifications.
- Connect the cathode (K) of the LED to the ground (GND) of the voltage sensing circuit.
2. Output Side (Isolated Monitoring):
- Connect the collector (C) of the phototransistor (inside the PC81713NIP1H) to the supply voltage (Vcc) of the monitoring circuit.
- Link the emitter (E) of the phototransistor to the ground (GND) of the monitoring circuit.
- Integrate a pull-up resistor (R2) between the collector (C) of the phototransistor and Vcc. Choose the resistor value carefully to ensure proper voltage level shifting and noise tolerance.
- The isolated output signal (OUT) is taken from the junction between the collector (C) of the phototransistor and the pull-up resistor (R2).
3. Considerations:
- Ensure the current through the LED (determined by R1) is sufficient to activate the phototransistor and transmit an accurate signal to the monitoring circuit.
- Select appropriate resistor values (R1 and R2) based on LED and phototransistor specifications, as well as voltage level requirements.
- Be aware of the response time of the optocoupler when dealing with AC signals, as this can impact signal accuracy and timing.
- Take safety measures to avoid electrical dangers when dealing with sources of AC electricity.
- Select the proper component ratings based on the electrical and environmental conditions in which the circuit will function.
In summary, the PC81713NIP1H optocoupler can be effectively used for isolated AC voltage sensing applications, providing electrical separation between the voltage sensing and monitoring circuits. Attention to LED current, resistor values, response time, and safety considerations is essential during the design process to ensure reliable signal isolation and monitoring.
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(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
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