Herein have mainly introduced the inverter circuit DIY fabrication process, and introduced the performance tests of inverter operating principle, circuit diagram of the inverter and inverter. Inverter of what this text produces see Fig. 1 Mainly by the MOS field effect tube, the ordinary power transformer forms. Its output power depends on the power of MOS field effect tube and power transformer, avoid the convoluted voltage transformer to wind, suit electronic fan’s spare time to adopt while making. Now introduce operating principle and fabrication process of this inverter.

1.Circuit diagram of the inverter

2.Inverter operating principle

We will introduce the operating principle of this inverter in detail here.

2.1. Signal generator of rectangular wave see Fig. 2

Rectangular wave signal generator of Fig. 2

Adopt six inverters of CD4069 and form the signal generator of rectangular wave here. R1 is the compensating resistance in the circuit, used for improving the oscillating frequency caused by change of the mains voltage unstably. The vibration of the circuit charged and discharged to finish through the electric capacity C1. Its oscillating frequency is f =The maximum frequency of 1/2.2 of the RC. diagramatic circuit is: fmax=1/2. 2* 3.3* 103* 2.2* 10-6=62.6Hz; Minimum frequency fmin =1/2.2* 4.3* 103* 2.2* 10-6=48.0Hz. is because of the error of the component, actual value will have some the difference. Other surplus inverters, earth and avoid influencing other circuit in the input end.

2.2 field effect tubes of driving circuit

3 field effect tubes of driving circuit of Fig.

Because the maximum crest of signal voltage of vibration that the rectangular wave signal generator outputs is 0~5V, for drive the intersection of power and switching circuit fully, here show as in Fig. 3 from voltage amplification to 0~12 V. oscillating beacon with TR1, TR2.

4. Performance test of the inverter

The test circuit is shown in Fig. 4. The input power used for test here adopts internal resistance low, with big discharge current generally greater than 100A 12V car storage battery,can offer for circuit the ones sufficient input power. Test is used and supported for the ordinary electric lamp. The method to test is to pass and change load magnitude, and the measurement input current, voltage and output voltage at this moment. The output voltage drops with increase of load, the consumed power of the bulb changes with voltage change. We can find out the relation between output voltage and power through calculating too. But will be with adding and changes in the voltage change of both ends because of the resistance of the electric lamp in fact, and the output voltage, electric current are not the sine wave, so the calculation of this kind can only be regarded as and estimated.

Test circuit of Fig. 4

Regard supporting the example as the electric lamp of 60W as: Suppose the resistance of the bulb does not change with voltage change. Because of R light =V2/ W=2102/60=735, so when the voltage is 208V, W=V2/R=2082/735 =Therefore 58.9 W. can convert the relation between voltage and power out. Pass The Test, we find when the output power is about 100W, the input current is 10 A. the output voltage is 200V at this moment.