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Using Omron Power Supplies to Make Positive and Negative DC Output Voltage Scope Positive and negative reference voltage can be required to properly power analog circuits or PNP/NPN devices. The positive and negative voltage can be created by wiring two power supplies together in a series configuration. Proper sizing and wiring of the power supplies will be demonstrated in this Technical Note. Background It is generally rare to need a negative voltage. Negative voltages can be required for sensors (such as load and torque sensors), PLC’s, PMOS switches, operational amplifiers (OP-Amps), crazy physics experiments, and more. When the outputs of a power supply are separated or floating this enables the creating of positive/negative outputs using two power supplies. Refer to the Omron power supply data sheet to determine if series operation or connection is permitted. The following table shows the Omron models that support series connection of outputs: Model S8VK-G S8VK-C S8JX S8VS S8VM Power Rating All Models All Models All Models 60, 90, 120, 180, 240, 480 Watts All Models Rated Output Voltage 5, 12, 24, 48 VDC 24 VDC 5, 12, 15, 24, 48 VDC 24 VDC 5, 12, 15, 24 VDC The connection of positive/negative output is similar to series connection but power supplies of the same voltage and wattage should be used for correct wiring. Page 1 Cat. No. TN-POWER-SUPPLY-POS-NEG-VOLTAGE 01/20/2014 Technical Note Application First connect Power Supply 1 (PS1) and Power Supply 2 (PS2) in a series connection. (Figure 1) Figure 1 Series Connection Second, the positive and negative voltage is created by tapping off the circuit between the two power supplies: (Figure 2) Figure 2: +/- Voltage This creates the output voltage at the same current level of both power supplies. If two 60 Watt, 24 VDC, 2.5 amp output power supplies are used, the creation of a +24 VDC and -24 VDC output is obtained. For electronic circuits a +5 VDC and a -5 VDC output may be required. As shown in figure 3, load 1 is positive voltage for control circuit and load 3 is a negative voltage to power transistors or operational-amplifiers in the same system. Load 1 Load 2 Figure 3: Loads connected +/- Voltage Page 2 Cat. No. TN-POWER-SUPPLY-POS-NEG-VOLTAGE 01/20/2014 Technical Note Additional Information If the full voltage of the 2 series connected power supplies is used by another load connect bypass diodes (D1 & D2) as shown: (Figure 4) Figure 4: Bypass Diodes Use Diode Type: Schottky barrier diode Dielectric strength (Vrrm): Twice the rated power supply output voltage or higher Forward Current (If): Twice the rated power supply output current or higher Conclusion You can create +/- voltage source by using two Power Supplies. This is an easy and inexpensive way to properly power analog circuits, microcomputer boards, IC chips or other circuits that require a voltage reference. Refer to the series operation of the power supplies used to determine the proper wiring connection. Page 3 Cat. No. TN-POWER-SUPPLY-POS-NEG-VOLTAGE 01/20/2014