The reason why the power supply should be set to +3.3V

Power supplies can be found everywhere in our lives, powering our electronic products. A power supply is a device that converts other forms of energy into electrical energy. The power source is based on the principle of "magnetic electricity", which is generated from renewable energy sources such as hydraulic power, wind power, ocean tides, dam water pressure differences, solar energy, etc., as well as burning coal, oil residue, etc. Common power sources are dry batteries (DC) and household 110V-220V AC power.

Performance

High-quality power supplies generally have multinational certification marks such as FCC, American UL, and China Great Wall. These certifications are professional standards for power supplies set by certification agencies based on technical specifications in the industry, including production processes, electromagnetic interference, safety protection, etc. Only products that meet certain indicators can use certification marks on packaging and product surfaces after applying for certification. Has a certain authority.

working principle

Generators can convert mechanical energy into electrical energy, and dry batteries can convert chemical energy into electrical energy.

Generators and batteries themselves are not charged. They have positive and negative charges at their two poles. Voltage is generated by positive and negative charges (current is formed by the directional movement of charges under the action of voltage). Charges are already present in conductors to generate current. You only need to apply voltage. When the two poles of the battery are connected to a conductor, the positive and negative charges are released in order to generate current. When the charges are dissipated, the charges are discharged (voltage).

Dry batteries, etc. are called power sources. A device that converts alternating current into direct current through a transformer and rectifier is called a rectified power supply. An electronic device that can provide a signal is called a signal source. The transistor can amplify the signal sent from the front and transmit the amplified signal to the subsequent circuit. The transistor can also be regarded as a signal source for the subsequent circuit. Rectified power supplies and signal sources are sometimes called power supplies.

A power supply is a device that provides power to electronic equipment, also called a power supply. It provides the power required by all components in the computer. The size of the power supply and whether the current and voltage are stable will directly affect the working performance and service life of the computer.

The computer power supply is a closed independent component installed in the main chassis. Its function is to convert alternating current into stable direct current such as 5V, -5V, +12V, -12V, +3.3V through a switching power supply transformer to supply System components such as system version, floppy disk, hard drive and various adapter expansion cards are used in the main chassis.

In layman's terms, if one power supply breaks down, another backup power supply takes its place. Hardware availability can be enhanced by providing battery backup for nodes and disks.

The disks should be connected to the power supply circuits in such a way that the mirror copies are connected to different power supplies. The root disk and its corresponding node should be powered by the same power circuit. In particular, the cluster lock disk (used as an arbiter when reorganizing the cluster) should have redundant power supplies, or it can be powered by a power source external to the nodes in the cluster.

Many disk arrays and other rack-mounted systems today contain multiple power inputs, and they should be deployed so that the different power inputs on the device are connected to separate circuit devices with two or three power inputs, so that, generally, whenever If no more than one circuit fails, the system can continue to operate normally. Therefore, if all the hardware in the cluster has 2 or 3 power inputs, it is required to have at least three independent circuits to ensure that there is no single point of failure in the circuit design of the cluster.

switching power supply

The working process of a switching power supply is quite easy to understand. In a linear power supply, the power transistor is operated in a linear mode. Different from the linear power supply, the PWM switching power supply allows the power transistor to work in the on and off states. In these two states, the volt-ampere product added to the power transistor is very small (when it is on, , the voltage is low and the current is large; when turned off, the voltage is high and the current is small)/ The volt-ampere product on the power device is the loss generated on the power semiconductor device.

Compared with linear power supplies, the more efficient working process of PWM switching power supplies is achieved by "chopping", that is, chopping the input DC voltage into a pulse voltage whose amplitude is equal to the input voltage amplitude. The duty cycle of the pulse is adjusted by the switching power supply's controller, and once the input voltage has been chopped into an AC square wave, its amplitude can be increased or decreased through the transformer. By increasing the number of secondary windings of the transformer, the output voltage value can be increased. Finally, these AC waveforms are rectified and filtered to obtain the DC output voltage.

The main purpose of the controller is to keep the output voltage stable, and its working process is very similar to the linear form of the controller. This means that the controller's functional blocks, voltage reference, and error amplifier can be designed to be identical to those of a linear regulator. The difference between them is that the output of the error amplifier (error voltage) passes through a voltage/pulse width conversion unit before driving the power tube. There are two main working modes of switching power supply: forward conversion and boost conversion. Although there is little difference in the arrangement of their parts, their working processes vary greatly, and each has its own advantages in specific applications.

Power supply classification

Ordinary power supply

It can also be subdivided into: switching power supply, inverter power supply, AC stabilized power supply, DC stabilized power supply, DC/DC power supply, communication power supply, module power supply, variable frequency power supply, UPS power supply, EPS emergency power supply, purification power supply, PC power supply, Rectified power supply, customized power supply, heating power supply, welding power supply/arc power supply, electroplating power supply, network power supply, power operating power supply, adapter power supply, linear power supply, power supply controller/driver, power supply, other ordinary power supply, inverter power supply, parametric power supply , voltage-regulated power supply, transformer power supply.

Special power supply

Special power supplies can be subdivided into: shore power supplies, security power supplies, high voltage power supplies, medical power supplies, military power supplies, aerospace power supplies, laser power supplies, and other special power supplies. Special power supply is a special type of power supply.

The so-called special is mainly because the technical index requirements for measuring power supplies are different from commonly used power supplies. The main reasons are that the output voltage is particularly high, the output current is particularly large, or the stability, dynamic response and ripple requirements are particularly high, or the power supply output voltage is required. Or the current is pulse or some other requirement. This makes the design and production of this type of power supply have more special and even stricter requirements than ordinary power supplies.

Special power supplies are generally designed for special loads or occasion requirements, and are widely used. Mainly include: electroplating electrolysis, anodizing, induction heating, medical equipment, electrical operation, electrical testing, environmental dust removal, air purification, food sterilization, laser infrared, photoelectric display, etc. In national defense and military fields, special power supplies have irreplaceable uses for ordinary power supplies. They are mainly used in: radar navigation, high-energy physics, plasma physics and nuclear technology research, etc.

Power supply +3.3V

What is the use of +3.3V power supply?

DDR memory is 3.3V, DDR1 memory is 2.5V, the reference voltage is 1.25V, DDR2 memory is 1.8V, the reference voltage is 0.9V. The CPU power supply is dual 12V, 3.3V is mainly supplied for booting, and the reset 5VSB (standby voltage) memory voltage is low. This is mostly due to a problem with the resistor in the memory power supply circuit. If there is a bulge or leakage in the capacitor, replacing the capacitor can solve the problem. Both the optical drive and the hard drive are powered by a set of 12V and 5V.

Solve the problem of abnormal output of 3.3v power supply

Abnormal 3.3V output of the computer power supply indicates that the power supply is internally broken and needs to be repaired or replaced with a new one. The maintenance method is to use a screwdriver to disassemble the power supply. First, visually check whether there are any obvious damaged components. After replacing the damaged components, use a multimeter to check whether there are any damaged original components starting from the power input terminal. If the damaged original is found, remove it and replace it. , until all broken original parts are replaced.

Then, remove the power fuse, connect the dummy load between the two fuse sockets of the power supply, plug in the power supply, and short-circuit the green and black wires of the power supply to see if the power supply can start - if the light is on, it means there is a short-circuit fault in the power supply. , needs to be inspected again. If it does not light up, it means that there is no major short-circuit fault in the power supply. You can try to measure whether the output of each group is normal. Connect it to the computer. If it can be used normally, it means it is OK. If it does not work, it needs to be inspected again. The above are some reasons for the voltage setting of the power supply, and I hope to share them with you.