Whether in the remote village, or the field needs or power outage, the inverter is a very good choice. The more common is the engine room will use the UPS power supply, in the event of a sudden power outage, the UPS DC inverter can be converted into AC for the computer to use, so as to prevent a sudden power outage caused by data loss.
This article will introduce two relatively simple circuit diagram of the inverter. And with a simple inverter circuit diagram shows that interested friends can study, do it yourself to do an inverter is indeed a very sense of accomplishment. One is a more common inverter circuit diagram.
The above is a relatively easy to produce the inverter circuit diagram, you can 12V DC power supply voltage inverter 220V mains voltage, the circuit from BG2 and BG3 composed of multi-harmonic oscillator to promote, and then BG1 and BG2 drive to control the BG6 And BG7 work. The oscillation circuit by the BG5 and DW group of power supply, so that the output frequency can be more stable. In the production, the transformer can be used commonly used dual 12V output mains transformer. According to the need to select the appropriate 12V battery capacity.
The following is a high efficiency sine wave inverter electrical diagram, the circuit with 12V battery-powered. First with a double voltage module voltage for the op amp power supply. The ICL7660 or MAX1044 can be selected. Op Amp 1 generates a 50 Hz sine wave as the reference signal. Op amp 2 as an inverter. Op amp 3 and op amp 4 as a hysteresis comparator. In fact, op amp 3 and switch 1 constitute a proportional switching power supply. Op amp 4 and switch 2 are the same. Its switching frequency is unstable. In the op amp 1 output signal is positive phase, op amp 3 and switch work. At this time op amp 2 output is negative phase. At this time op amp 4 positive input potential (constant 0) than the negative input terminal potential is high, so the op amp 4 output constant 1, switch off. In the op amp 1 output is negative phase, the opposite. This enables the two switches to work alternately.
When the reference signal than the detection signal, that is, op amp 3 or 4 of the negative input signal than the positive input signal higher than a small value, the comparator output is 0, switch tube is open, followed by the detection signal quickly increased, when the detection signal Compared with the reference signal is higher than a small value, the comparator output 1, switch off. It should be noted that the comparator has a positive feedback process when the circuit is flipped, which is the characteristic of the hysteresis comparator. For example, under the premise that the reference signal is lower than the detection signal, the reference signal is immediately higher than the detection signal at a certain moment as their differences are close to each other. This "certain value" affects the switching frequency. It is the lower the frequency.
C3, C4 role is to allow the frequency of the switch freewheeling current through, and the lower frequency of the 50Hz signal to produce a larger impedance. C5 is calculated by the formula: 50 =. L is generally 70H, the best time to make a test. So that C is about 0.15μ. R4 and R3 ratio should be strictly equal to 0.5, large waveform distortion significantly, small can not start, but would rather large, not small. The maximum current of the switch tube is: I == 25A.
The existing inverter, there are two kinds of square wave output and sine wave output. Square wave output of the inverter efficiency is high, for the use of sine wave power design of the electrical appliances, in addition to a small number of electrical appliances do not apply to most of the electrical appliances are applicable, sine wave output inverter does not have this shortcomings, but there Inefficient shortcomings, how to choose this need to be based on their own needs.