How to troubleshoot the inverter power supply failure?

Some customers would like to ask the question: How to troubleshoot the inverter power supply failure? Now we are tell you How to troubleshoot the inverter power supply failure.
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Inverter power supply has the characteristics of high reliability, and has been widely used in communications, military industry, electric power and other fields. In the process of application, some faults may be encountered, ranging from the system can not be started, and the circuit is burned. How to clear the inverter power supply failure?
Input voltage is too high
The input parameters of the inverter power supply are abnormal-the input voltage is too high. In this case, abnormalities can cause the system to fail to operate normally, and in the worst case, it will burn the circuit. So what are the reasons for the high input voltage?
The output terminal is floating or no load;
The output end load is too light, lighter than 10% of the rated load;
The input voltage is too high or disturbs the voltage.
For this type of problem, the load at the output terminal or the input voltage scale can be adjusted, as shown in detail below:
Ensure that the output end is not less than 10% of the rated load. If there is no load during the actual circuit operation, connect a dummy load of 10% of the rated power at the output end in parallel;
To replace a reasonable-scale input voltage, consider adding a TVS tube or a voltage regulator tube to the input terminal when there is a disturbance voltage.
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The output voltage is too low
The output parameters of the inverter power supply are abnormal-the output voltage is too low. This may cause the entire system to fail to operate normally, such as the microcontroller system, the load suddenly increases, which will lower the supply voltage of the microcontroller and easily reset. Moreover, when the inverter power supply is operated for a long time at a low input voltage, the life of the circuit will also be greatly reduced. Therefore, the problem of low output voltage cannot be ignored. So what are the reasons for low output voltage?
Low input voltage or lack of power;
The output line is too long or too thin, resulting in excessive line loss;
The voltage drop of the anti-reverse diode at the input end is too large;
The input filter inductance is too large.
For this type of problem, it can be improved by adjusting the power supply or replacing the corresponding peripheral circuit. The details are as follows:
Increase the voltage or switch to a higher power input inverter power supply;
Adjust the wiring, increase the cross-sectional area of ​​the wire or shorten the length of the wire, and reduce the internal resistance;
Switch to a diode with a small turn-on voltage drop;
Reduce the filter inductance value or reduce the internal resistance of the inductance.
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Excessive output noise
The output parameters of the inverter power supply are abnormal-the output ripple noise is too large. As we all know, noise is a key target for measuring the quality of inverter power supply. In the application of circuits, planning and layout will also affect the output noise. So, what are the reasons for the excessive output ripple noise?
The distance between the inverter power supply and the noise sensitive components of the main circuit is too close;
No decoupling capacitor is connected to the input end of the inverter power supply of the noise sensitive component of the main circuit;
Difference frequency interference occurs between the inverter power supplies of each single output in the multi-channel system;
The ground wire treatment is unreasonable.
For this type of problem, it can be improved by blocking the module and noise equipment or using decoupling capacitors in the main circuit. The details are as follows:
Keep the inverter power as far away as possible from the main circuit noise-sensitive components or modules and main circuit noise-sensitive components;
0.1μF decoupling capacitor is connected to the input end of the inverter power supply of the main circuit noise sensitive components (such as: A/D, D/A or MCU, etc.);
Use a multiple-output inverter power supply to replace multiple single-channel outputs to eliminate difference frequency interference;
Use one point grounding at the far end to reduce the ground loop area.
Inverter power supply withstand voltage is poor
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For the abnormal performance parameters of the inverter power supply-the withstand voltage of the inverter power supply is poor. In general, the withstand voltage of the blocked inverter power supply is as high as several thousand volts, but it may not reach the target during the use or test. So what factors will greatly reduce its withstand voltage?
The withstand voltage tester has power-on overshoot;
For this type of problem, two improvements can be made through standard testing and standard application. The details are as follows:
The voltage is gradually increased during the withstand voltage test;
Choose an inverter power supply with a higher withstand voltage;
When welding the inverter power supply, select the appropriate temperature to prevent repeated welding and damage the inverter power supply.
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Best Plus Power is a manufacturer and provider of dependable high efficiency power electronics, energy conversion systems and power supplies. Best Plus Power solutions include a complete line of high-efficiency rectifiers, inverters and DC power systems for mission critical applications. With over 10-Years experiences supporting customers in more than 60 countries, Best Plus Power is focused on bringing reliable power solutions to customers across all applications and environments, which specialize in Battery Chargers, Power Inverters, Power Supplies / Rectifiers, DC / DC Converters, Frequency Converters, and other Power supplies.
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