Basic Questions and Answers about Power Inverter

This article mainly records some basic knowledge questions and answers related to power inverters. Power inverter (car power supply) is a kind of power converter that can convert DC12V direct current into AC220V alternating current, which is the same as the mains power, for general electrical appliances. It is a convenient power converter. The power inverter automatically realizes the battery protection function by the internal electronic circuit. Power inverter is not only suitable for car systems, but also can be used in any occasion with DC12V power supply to convert DC12V into AC220V alternating current, bringing convenience to your life.

I. Basic Knowledge Questions and Answers

1. What is the difference between the continuous output power and peak output power of a power inverter?

Continuous power and peak power differ in the meaning they express.

Continuous load = current value × 220 (AC voltage)

Starting load = 2 × power value

Generally speaking, the starting load of an appliance or power tool determines whether your power converter is capable of powering it.

2. What is the inverter inductive load?

Normally, a load with inductance parameters, that is, a load that conforms to the current leading voltage characteristic, is called an inductive load.

3. What is a capacitive load?

Generally, a load with capacitive characteristic parameters, that is, a load that conforms to the voltage leading current characteristics, is called a capacitive load.

4. What is the difference between inductive load and capacitive load?

The load characteristics are different. First of all, when selecting the load, it must meet the rated power of the power inverter. As long as the use conditions of the power inverter are met, the effect of capacitive and inductive loads is the same.

5. What is the difference between the output waveform of the power inverter and the output 220V mains voltage?

The power inverter outputs a simulated sine wave, while the mains power is a true sine wave.

6. What is the difference between the waveform output by the power inverter and the voltage value of the output 220V?

The 220V voltage value output by the power inverter is exactly the same as the city voltage value.

7. Is the power inverter only suitable for input DC voltage of 11-15V?

The power inverter is only suitable for input DC voltage of 11V-15V.

8. Can it be applied and work if the output value is higher or lower than this value?

If the input voltage is lower than this value, the power inverter will send out a low voltage alarm. Please pay attention to the power load. When the input voltage is very low, the power inverter will automatically protect. When the input voltage is higher than this value, the power inverter will automatically protect. When the input voltage is much higher, the power components of the power inverter will be damaged.

9. How to understand the conversion efficiency of power inverter?

The conversion efficiency of a power inverter generally refers to the ratio of the output effective power to the total input power. It can be understood that the higher the conversion efficiency, the better.

10.What is the no-load current value of the power inverter?

No-load current refers to the current consumed by the power inverter itself when there is no load.

11.What is the main function of the cooling fan of the power inverter?

The cooling fan of the power inverter mainly plays the role of heat dissipation. The side panel fan draws air to form air convection, so that the power components of the power inverter work in a safe temperature environment.

2. Basic manufacturing process questions and answers

1. There is SMT patch process in power inverter manufacturing. What is SMT patch process?

"SMT" is called "Automatic Programming Mounting Machine". "SMT" is actually a packaging form of resistor and capacitor components. It has high precision, small size, high degree of automation, and good component welding reliability. The power inverter is processed and produced through SMT.

2. What is a microcontroller?

Any power inverter model that uses a CPU microprocessor to implement high and low voltage alarms, protection and other parameters and functions is called a single-chip model.

3.What is a simulator?

A model that realizes the functions of various parameters of the power inverter by separating components is called a simulator.

4.What are the performance characteristics of a power inverter?

The power inverter can convert DC12V to 220V. It has the following functions:

1) Input high voltage, low voltage alarm and protection.

2) Overload protection.

3) Momentary impact of twice the rated power.

4) Overload and short circuit protection.

5. How does a power inverter work?

The CPU microprocessor realizes PWM pulses, and converts the low voltage 12V into a DC voltage of about 300V through a high-frequency transformer. Then the CPU outputs a 50 Hz AC drive signal to drive the power switch to work. Through the successive conduction conversion of the power tube, an AC voltage with an average effective value of 220V in the form of a square wave is output.

6. Is the voltage output by the power inverter stable?

The output voltage of the power inverter can be stabilized through its own feedback confirmation. The voltage value difference between no-load and rated is less than 10V.

7. How to determine whether its stable value is safe for users?

The power inverter fully considers the external use environment. When an overload or short circuit occurs, the power inverter will automatically shut down for protection.

8. What does the output frequency of a power inverter refer to? What is its output frequency?

The output frequency of the power inverter refers to the period of the output AC square wave. Its frequency is 50 Hz. The national power supply standard is 50 Hz. In general, the period is 20MS, F=1/T=50HZ.

9.What is continuous output power?

Continuous power refers to the power that the power inverter can work continuously under normal circumstances.

10.What is peak output power?

Peak power refers to the power that the power inverter can withstand at the moment of startup, usually referring to motor-type loads. The instantaneous starting power formed due to the large starting current during startup is called peak output power.