Series operation is a configuration method in which multiple power supplies are connected in series to increase the total output voltage.
In this configuration, the positive terminal of one power supply is connected to the negative terminal of the next. The total output voltage is the sum of the individual voltages. This follows the fundamental principle of series circuits, where voltages across series-connected elements are additive.
For example, connecting two 30 kV high-voltage power supplies in series enables a total output of 60 kV. This technique is frequently used in testing equipment and research applications requiring voltages higher than a single unit can provide.
Critical Considerations for Series Operation
Proper circuit design is essential to ensure safety and prevent equipment damage. Key precautions include:
- Isolation and Floating Output: Power supplies used in series must be capable of "floating" operation. The insulation to ground (withstand voltage) of the upper-stage units must exceed the total combined voltage of the system. Standard grounded models cannot be used in series as this would cause a short circuit.
- Reverse Voltage Protection: If one power supply fails or starts up slower than the others, reverse voltage may be applied to its terminals, potentially causing damage. To prevent this, a reverse protection diode must be connected in parallel with the output of each power supply.
- Ripple Accumulation: Output ripple and noise from each unit are additive. The total ripple in series operation will be higher than that of a single unit, which may affect sensitive applications.
While series operation is an effective method for achieving high voltages, please consult the product datasheet or contact us to verify that your specific power supply model supports this configuration.