cr2032 button battery

Summary of common cr2032 button battery faults and troubleshooting methods

Common UPS uninterruptible power supply faults and troubleshooting methods

1. UPS output is normal when there is AC power, but the buzzer keeps beeping and there is no output when there is no AC power.

Fault analysis: Judging from the phenomenon, the battery and inverter are partially faulty. You can check according to the following procedures:

- Check the battery voltage to see if the battery is undercharged. If the battery is undercharged, check whether it is a fault in the battery itself or a fault in the charging circuit.

- If the battery working voltage is normal, check whether the inverter drive circuit is working normally. If the drive circuit output is normal, it means that the inverter is damaged.

- If the inverter drive circuit is not working properly, check whether the waveform generation circuit has PWM control signal output. If there is a control signal output, it means that the fault is in the inverter drive circuit.

- If the waveform generation circuit has no PWM control signal output, check whether its output is blocked due to the protection circuit. If so, find out the protection reason;

- If the protection circuit does not work and the working voltage is normal, but the waveform generation circuit has no PWM waveform output, it means that the waveform generation circuit is damaged.

The above troubleshooting sequence can also be reversed, which can sometimes find the fault faster.

2. The battery voltage is low, but after charging for more than ten hours, the battery voltage still cannot be charged. Fault analysis:

Judging from the phenomenon, it is a battery or charging circuit failure. You can check it according to the following steps:

—— Check whether the input and output voltage of the charging circuit are normal;

—— If the input of the charging circuit is normal, but the output is abnormal, disconnect the battery and measure again. If it is still abnormal, it is a charging circuit failure;

—— If the input and output of the charging circuit are normal after disconnecting the battery, it means that the battery has been damaged due to long-term non-charging, over-discharge or reaching the end of its life.

3. A pair of power amplifier transistors in the power stage of the inverter are damaged. After replacing the transistors of the same model, they are burned out again after running for a period of time. The reasons for the excessive current are:

—— Overcurrent protection failure. When the inverter output has an overcurrent, the overcurrent protection circuit does not work;

--The pulse width modulation (PWM) component fails, and the two complementary waveforms of the output are asymmetric. One is on for a long time, while the other is on for a short time, which makes the two arms work unbalanced, or even both arms are on at the same time, causing damage to the two tubes;

--The power tube parameters differ greatly. At this time, even if a symmetrical waveform is input, the output will be asymmetric. The waveform passes through the output transformer, causing bias magnetism, that is, unbalanced magnetic flux. The accumulation leads to transformer saturation and a sudden increase in current, burning out the power tube. When one is burned out, the other will also be burned out.

4. After the UPS is turned on, there is no display on the panel, and the UPS does not work.

Fault analysis: Judging from the fault phenomenon, the fault is in the AC input, battery, AC detection part and battery voltage detection circuit:

—— Check whether the AC input fuse is burned;

—— If the AC input fuse is intact, check whether the battery fuse is burned, because some UPS will turn off all UPS outputs and displays when the battery voltage cannot be detected by self-detection;

—— If the battery fuse is intact, check whether the AC detection circuit is working properly. If the AC detection circuit is not working properly and the UPS does not have the function of starting without AC power, the UPS will also turn off all outputs and displays.

—— If the AC detection circuit is working properly, check whether the battery voltage detection circuit is normal.

5. When the UPS is connected to the AC power, every time the UPS is turned on, the relay can be heard repeatedly, the battery voltage indicator on the UPS panel is long on and the buzzer is long. According to the above fault phenomenon, it can be judged that the fault is caused by the low battery voltage, which leads to the unsuccessful start of the UPS. Remove the battery and perform balanced charging first (all batteries are charged in parallel). If it still fails, only the battery can be replaced.

6. A backup UPS works normally when there is AC power. When there is no AC power, the inverter has output, but the output voltage is low, and the transformer makes a lot of noise.

Fault analysis: The inverter has output, which means that the final drive circuit is basically normal. The transformer has noise, which means that the two arms of the push-pull circuit work asymmetrically. The detection steps are as follows:

- Check whether the power is normal;

- If the power is normal, check whether the output signal of the pulse width output circuit is normal;

- If the output of the pulse width output circuit is normal, check whether the output of the drive circuit is normal.

7. When the UPS is turned on when the AC power supply is normal, the inverter working indicator flashes and the buzzer makes intermittent sounds. The UPS can only work in the inverter state and cannot be switched to the AC power state.

Fault analysis: If the inverter power supply cannot be converted to the mains power supply, it means that there is a fault in the inverter power supply to mains power supply conversion part. The key detections are:

——Is the mains input fuse damaged?

——If the mains input fuse is intact, check whether the mains rectifier filter circuit output is normal?

——If the mains rectifier filter circuit output is normal, check whether the mains detection circuit is normal?

——If the mains detection circuit is normal, check whether the inverter power supply to mains power supply conversion control output is normal.

8. When the backup UPS is close to full load, the mains power supply is normal, but the battery fuse is blown when the battery is powered.

Fault analysis: The battery fuse is blown, indicating that the battery current is too large. The detection steps are as follows:

——Is the inverter broken down?

——Is the battery voltage too low?

——If the battery voltage is too low, check whether the battery charging circuit is normal?

——If the battery charging circuit is normal, check whether the battery voltage detection circuit is working properly.

9. UPS can only be powered by AC power and cannot be converted to inverter power.

Fault analysis: If the AC power cannot be converted to inverter power, it means that there is a fault in the conversion part of AC power to inverter power. Focus on the following inspections:

- Is the battery voltage too low and the battery fuse intact?

- If the battery part is normal, check whether the battery voltage detection circuit is normal;

If the battery voltage detection circuit is normal, check whether the AC power to inverter power conversion control output is normal.

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