Ronald Anami
Jul 15
What is the purpose of bleeder resistor in in direct power supply?
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ChatGPT
Jul 15
The purpose of a bleeder resistor in a direct power supply is to discharge the filter capacitors when the power supply is turned off. This helps to prevent the capacitors from retaining a dangerous charge, which could pose a risk of electric shock to anyone working on or near the power supply. The bleeder resistor provides a path for the stored energy in the capacitors to dissipate safely, reducing the risk of injury.
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Google Gemini AI
Jul 15
Purpose of Bleeder Resistor in Direct Power Supply
A bleeder resistor is a resistor connected across the output terminals of a direct power supply (also known as a DC power supply) to serve the following purposes:
1. Discharge Capacitor When Switched Off:
When the power supply is switched off, it disconnects the load from the supply and the capacitors in the power supply circuit store charge. The bleeder resistor provides a path for this stored charge to discharge over time, preventing dangerously high voltages from remaining on the capacitors. This discharge process helps ensure the safety of both the equipment and users.
2. Voltage Regulation:
In some power supply designs, a bleeder resistor can help regulate the output voltage by providing a small constant load. This load prevents the output voltage from rising excessively if the actual load is disconnected.
3. Reducing Ripple Voltage:
Bleeder resistors can reduce ripple voltage (AC voltage superimposed on DC output) by providing a low-impedance path for transient currents. This helps to smooth out the output voltage and make it more stable.
4. Limiting Inrush Current:
When the power supply is initially turned on, the capacitors can draw a large inrush current, which can stress circuit components. A bleeder resistor limits this inrush current by providing a gradual discharge path for the capacitors.
Selection of Bleeder Resistor:
The value of the bleeder resistor is typically chosen to balance the following factors:
- Discharge Time: High resistance values result in longer discharge times.
- Voltage Regulation: Higher resistance values provide better voltage regulation.
- Ripple Voltage Reduction: Lower resistance values reduce ripple voltage more effectively.
The actual value is often determined experimentally or through calculations based on the power supply design and desired performance characteristics.
A bleeder resistor is a resistor connected across the output terminals of a direct power supply (also known as a DC power supply) to serve the following purposes:
1. Discharge Capacitor When Switched Off:
When the power supply is switched off, it disconnects the load from the supply and the capacitors in the power supply circuit store charge. The bleeder resistor provides a path for this stored charge to discharge over time, preventing dangerously high voltages from remaining on the capacitors. This discharge process helps ensure the safety of both the equipment and users.
2. Voltage Regulation:
In some power supply designs, a bleeder resistor can help regulate the output voltage by providing a small constant load. This load prevents the output voltage from rising excessively if the actual load is disconnected.
3. Reducing Ripple Voltage:
Bleeder resistors can reduce ripple voltage (AC voltage superimposed on DC output) by providing a low-impedance path for transient currents. This helps to smooth out the output voltage and make it more stable.
4. Limiting Inrush Current:
When the power supply is initially turned on, the capacitors can draw a large inrush current, which can stress circuit components. A bleeder resistor limits this inrush current by providing a gradual discharge path for the capacitors.
Selection of Bleeder Resistor:
The value of the bleeder resistor is typically chosen to balance the following factors:
- Discharge Time: High resistance values result in longer discharge times.
- Voltage Regulation: Higher resistance values provide better voltage regulation.
- Ripple Voltage Reduction: Lower resistance values reduce ripple voltage more effectively.
The actual value is often determined experimentally or through calculations based on the power supply design and desired performance characteristics.
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