Simple Dual Output Voltage Doubler and Inverter Circuit

This Simple Dual Output Voltage Doubler and Inverter Circuit is very useful for power electronics.

It give higher voltage or negative voltage from one power source.

Circuit is good for DC to DC change, battery devices and low power circuits.

It uses special chip IC MAX660 with few parts and can load current up to 100mA.

Input voltage is 1.5 to 5.5V DC but load current must stay under 100mA.

This circuit with MAX660 makes negative voltage (-Vin) and double voltage (2Vin – 1.4V)

Circuit Working:

Parts List:

This circuit use MAX660 chip a special voltage converter called charge pump.

It works with capacitors and diodes to make output voltages.

How it works:

MAX660 switches capacitors to flip +Vin into -Vin output.

Capacitor C1 is very important for charge pump and C2 keeps output voltage steady.

Diode D1 1N4148 stop reverse current and keep charge moving right.

Next part doubles input voltage.

Capacitor C3 charges to Vin and then adds with Vin to double voltage.

Diode D2 moves charge to C4 and smooth double voltage output.

Final output is about 2Vin minus 1.4V means 1.4V from two diode drops.

Formulas with Calculations:

Voltage Inversion Output:

Circuit flip input voltage with MAX660.

Ideal output: Vout = -Vin

Example: Vin = 5V

Vout = -5V negative same size as input

Voltage Doubling Output:

Ideal output: Vout = 2Vin

But two diodes D1and D2 drop voltage each about 0.7V.

Total drop = 1.4V

Real output: Vout = 2Vin – 1.4V

Example: Vin = 5V

Ideal = 10V and real = 8.6V because of diode drops.

How to Build:

To build a Simple Dual Output Voltage Doubler and Inverter Circuit follow the below steps for connections:

• Get all parts like circuit diagram.
• Connect pin 2 of IC1 to one side of C1 and other side of C1 to pin 4 of IC1.
• Connect pin 3 and pin 6 of IC1 to ground GND.
• Connect pin 5 of IC1 to output -Vin.
• Connect C2 negative to pin 5 and positive of C2 to GND.
• Connect pin 8 of IC1 to +Vin.
• Connect diode D1 anode between pin 8 and D2 anode.
• Connect C3 negative to pin 2 and C3 positive to D2 anode.
• Connect C4 positive between D2 cathode and output 2Vin -1.4V and C4 negative to GND.

Conclusion:

This Simple Dual Output Voltage Doubler and Inverter Circuit gives two outputs negative voltage and double voltage from one power source.

IAT IS Good for projects which need different voltages.

MAX660 IC chip charge pump and help build easy and small with no big inductors.

Pick right capacitors and diodes to adjust for low power projects.

References:

Voltage Doubler Design and Analysis