Sales of the largest currently on the market, the most common vehicleInverterThe output power of 70W-150W, Inverter circuit mainly uses TL494 or KA7500 chip-based pulse-width modulation circuit. Car inverter circuit as a whole can be largely divided into two parts, each part of the adoption of a TL494 or KA7500 chips control circuit, in which the role of the first part of the circuit isAutomotive12V DC battery such as those provided by high-frequency PWM (pulse width modulation) switching power supply technology to convert 30kHz-50kHz, 220V AC or so; the second part of the role of the circuit is to use the bridge rectifier, filter, pulse-width modulation and switching power output and other technology, 30kHz ~ 50kHz, 220V AC converted to about 50Hz, 220V AC.
Maintenance points of power inverter product
As Car Inverter Circuits generally have a power soft-start function, so switched on to wait for 5s-30s will be after the 220V AC output, while LED lights lit. When the LED indicator does not light, then the inverter circuit that did not work.
When switched on 30s and above, LED lights do not light up when you need to measure the output jack at the exchange of XAC voltage value, if the voltage of 220V or so normal, then only part of the circuit LED indicator light appeared fault; if XAC by measuring the output jack of the AC voltage at a value of 0, then cause of the malfunction of inverter circuit before the class did not work, probably chip IC1's internal protection circuitry has been launched.
The internal protection circuit chip IC1 determine whether to activate the approach is: Use a multimeter measuring DC voltage blocking chip IC1's pin 3 to ground DC voltage value, if the voltage is above 1V is illustrated in the internal protection circuit chip has been launched, otherwise the interruption action due to the reasons for non-protection circuits.
If the chip IC1 to ground voltage of 3 feet or more values in the 1V, indicating that the internal protection circuit chip has been activated, the need for further DC voltage with the multimeter test chip IC1 block of 15,16 feet between the DC voltage, and chip IC1's DC voltage between 1,2 feet. Under normal circumstances, Figure 1 circuit chips IC1, 15 feet on the ground DC voltage should be higher than 16 feet on the ground DC voltage, two feet on the ground of the DC voltage should be higher than one foot on the ground DC voltage, only when the two conditions are met, the chip IC1's 3 feet on the ground as a normal DC voltage to 0V about inverter circuit to work properly. If it is found in a test voltage does not meet the above-mentioned relationship, just press the corresponding slip road to find cause of the malfunction, you can solve problems.
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