Household inverter circuit (2)

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This inverter has excellent performance and various functions: 1Using TUPS inverter special module, simple and reliable; 2 inverter, voltage regulation, charging three-in-one; 3 automatic load detection, automatic startup when there is load, No load automatic shutdown; 4 constant current charging, full self-stop, battery loss and self-closing. The circuit is as shown.

Household inverter circuit (2)

Circuit working principle: IC1 is a special module for TUPS inverter, which contains inverter and charging circuit, which can directly drive inverter transformer. It has simple structure and stable and reliable operation.
VD1 to VD3, V1, V2 and relay K constitute an automatic load detection circuit. When the circuit is in the inverter state, if the output socket XI is connected with a load, the battery, VD1 ~ VD3, load, etc. are connected into a loop, the current flows through VD2, VD3 to generate a voltage drop, VI, V2 are turned on, and the LED is lit. Indication, K pulls in, and its contact K1 turns on the connection between IC1 and the transformer. The inverter automatically starts up, and the output inverter voltage is converted to the load of X1 through K2. If the load in X1 is disconnected, the detection circuit is cut open and the inverter is automatically shut down to save energy.
The battery voltage detection circuit is composed of an IC2 comparator and its peripheral components. According to experience, the 12V battery's deficient voltage threshold is lO.5V, and the overvoltage threshold is 15V. When the battery voltage is within this normal range, the comparators A1 and A2 are cut off, and the inverter power supply works normally. When the over-discharge voltage of the battery is lower than lO.5V during the inverter, the R voltage is compared with the vz reference voltage, and the A2 is turned to output a low level. Similarly, when the battery is fully charged with voltage higher than 15V when charging, it is divided and compared by R2, and Al flips to output low level. After any of the comparators of Al and A2 output a low level, the relay K is released by the action of VZ, and the connection between the battery and the transformer is disconnected. In order to adapt to a wide range of circuit voltage changes, the machine uses a constant current charging method. During charging, in the transformer circuit, the series capacitor C uses the capacitive reactance of C to make the charging current substantially constant at around 6A.
The characteristic of the household inverter is that the load household appliances are often changed, and the power is uncertain. In order to prevent the inverter output voltage from being too high or too low beyond the normal working range of the appliance, the circuit has an inverter voltage regulation function, and the S2 can be adjusted to adjust the XI output voltage. In addition, the circuit can also be used directly as a 500W AC voltage regulator. At this time, S1 is set in the pressure measuring and adjusting gear. When the input voltage is changed between 160 and 260V, the S2 can be adjusted to obtain a relatively stable voltage of 210 to 230V in the X1 output socket.
Production and testing: The inverter output power of this unit can be freely selected between 50 and 300W. (100W power as an example) Selection of main components: IC1 can use UPS1201A inverter module, its radiator size is more than 2OOmm × 20Omm × 2mm, RP1, RP2 use potentiometer with lock nut; VD1 ~ VD3 with 3A / 50V rectifier diode; the operating voltage of relay K is 9V or 12V, wherein contact K1 should be able to pass more than 10A current, if not enough can be solved in parallel; the contact current of switch S1, S2 should also be greater than 2A, the winding of the inverter transformer The data can be seen in Figure (a).