1.5V to 220V Low Power Inverter
Category: Analog Circuits
Designer: RANA MUHAMMAD ADNAN KHALIL
Notes
This circuit is designed and simulated in Proteus 7.10. In this circuit you will learn how to make inverter using npn and pnp transistor. This is a very low power inverter (almost 5W), and the working of this circuit is given below: 1. To understand this circuit first see previous circuit "Relaxation Oscillator" in Oscillators category.. 2. The relaxation oscillator is a nonlinear electronic oscillator and it produces non-sinusoidal repetitive output signal. 3. Lets consider initial state, the npn transistor Q2 is turned ON through resistor R2. 4. The collector of npn transistor is connected with the base of pnp transistor Q1, emitter of pnp transistor is connected with the positive terminal of battery and emitter of npn transistor is connected with ground (-ve terminal of battery). 5. The collector of pnp transistor is connected with the step up transformer and posistive terminal of capacitor C1, and other end of transformer is connected with the ground (-ve terminal of battery). 6. When Q2 is ON, it will turn ON Q1 by connected its base with ground, and capacitor C1 charges through Q1 transistor. 7. The the charge of C1 equals battery voltage, then Q2 become off and capacitor C1 discharges, again when C1 is discharged, the npn transistor Q2 will again turned ON through resistor R2, and this phenomenon continuous and provides oscillation in audible range, which can be listen through speaker or can be seen using oscilloscope. 8. The frequency of oscillation can be changed by changing resistor R2 or capacitor C1, that is changing R2*C1 time constant (product of R2 and C1). 9. In this circuit the frequency is set near 50Hz to drive transformer. 10. A step up transformer is used to convert 1.5V oscillations to 220V. Application: 1. This circuit can be used to test the speaker. 2. This circuit can be used to generate non-linear oscillations. 3. This circuit can be used to invert very low voltage (1.5Vdc) to high voltage ac (220Vac), but very low power (almost 5W). Download these files to perform more experiments. New circuits are added on daily basis. So come back daily to get new amazing and exciting circuits.