DC regulated power supply is a power supply device widely used in electronic equipment. It can stabilize the input DC voltage within a certain range to meet the requirements of electronic equipment for voltage stability. However, in actual use, sometimes the current of DC regulated power supply cannot be adjusted.
Working principle of DC regulated power supply
Before analyzing the reasons why the current of DC regulated power supply cannot be adjusted, we first need to understand the working principle of DC regulated power supply. DC regulated power supply mainly consists of rectifier, filter, voltage regulator and protection circuit.
Its working principle is as follows:
1.Rectifier: converts the input AC voltage into pulsating DC voltage. Rectifiers are usually implemented by devices such as diodes or thyristors.
2.Filter: filter the rectified pulsating DC voltage to reduce the ripple component in the voltage. Filters are usually implemented by devices such as capacitors and inductors.
3.Voltage regulator: stabilize the filtered DC voltage within a certain range. Voltage regulators are usually implemented by devices such as voltage regulator diodes, voltage regulator transistors, and voltage regulator integrated circuits.
4.Protection circuit: When an abnormal situation occurs in the DC regulated power supply, the protection circuit can cut off the power supply in time to protect the safety of electronic equipment. The protection circuit is usually implemented by fuses, overvoltage protection, overcurrent protection and other devices.
Analysis of the reasons why the current of the DC regulated power supply cannot be adjusted
Rectifier failure
The rectifier is a key component in the DC regulated power supply, and its performance directly affects the output current of the DC regulated power supply. If the rectifier fails, the output current of the DC regulated power supply may not be adjusted. Rectifier
The main reasons for the failure are as follows:
1. Rectifier diode damage: The rectifier diode is the core component in the rectifier. If the rectifier diode is damaged, the rectifier will not work properly, thereby affecting the output current of the DC regulated power supply.
2. Rectifier diode aging: The rectifier diode will gradually age during use, and its performance will gradually decrease. When the rectifier diode ages to a certain extent, the output current of the DC regulated power supply may be unadjustable.
3. The rectifier circuit design is unreasonable: If the rectifier circuit design is unreasonable, it may cause the rectifier to be abnormal during operation, thereby affecting the output current of the DC regulated power supply.
Filter failure
The function of the filter is to reduce the ripple component in the output voltage of the DC regulated power supply. If the filter fails, it may cause the output current of the DC regulated power supply to be unstable, thereby affecting the current regulation. The main reasons for the filter failure are as follows:
1. Damage to the filter capacitor: The filter capacitor is the core component in the filter. If the filter capacitor is damaged, the filter will not work properly, thereby affecting the output current of the DC regulated power supply.
2. Damage to the filter inductor: The filter inductor is also an important component in the filter. If the filter inductor is damaged, the filter will not work properly, thereby affecting the output current of the DC regulated power supply.
3. Unreasonable filter circuit design: If the filter circuit design is unreasonable, it may cause the filter to be abnormal during operation, thereby affecting the output current of the DC regulated power supply.
Voltage regulator failure
The voltage regulator is the core component in the DC regulated power supply, and its performance directly affects the output voltage and current of the DC regulated power supply. If the voltage regulator fails, the output current of the DC regulated power supply may be unadjustable. The main reasons for the failure of the voltage regulator are as follows:
1. Damage to the voltage regulator diode: The voltage regulator diode is the core component of the voltage regulator. If the voltage regulator diode is damaged, the voltage regulator cannot work properly, thereby affecting the output current of the DC regulated power supply.
2. Damage to the voltage regulator transistor: The voltage regulator transistor is also an important component in the voltage regulator. If the voltage regulator transistor is damaged, the voltage regulator cannot work properly, thereby affecting the output current of the DC regulated power supply.
3. Damage to the voltage regulator integrated circuit: The voltage regulator integrated circuit is a commonly used voltage regulator device in modern DC regulated power supplies. If the voltage regulator integrated circuit is damaged, the voltage regulator cannot work properly, thereby affecting the output current of the DC regulated power supply.
4. Unreasonable design of the voltage regulator circuit: If the voltage regulator circuit is not designed reasonably, it may cause the voltage regulator to be abnormal during operation, thereby affecting the output current of the DC regulated power supply.
