Do you really know the function of the power supply +3.3V?

A power source is a device that converts other forms of energy into electrical energy. The power source comes from the principle of “magnetism generating electricity”, which is generated by renewable energy sources such as water power, wind power, ocean tide, dam water pressure difference, solar energy, and burning coal and oil residue. Common power sources are dry batteries (direct current) and household 110V-220V AC power sources.

power supply

A power source is a device that converts other forms of energy into electrical energy. The power source comes from the principle of “magnetism generating electricity”, which is generated by renewable energy sources such as water power, wind power, ocean tide, dam water pressure difference, solar energy, and burning coal and oil residue. Common power sources are dry batteries (direct current) and household 110V-220V AC power sources.

Do you really know the function of the power supply +3.3V?


High-quality power supplies generally have multi-national certification marks such as FCC, American UL, and Great Wall of China. These certifications are professional standards formulated by certification bodies for power supplies in accordance with technical specifications in the industry, including production processes, electromagnetic interference, safety protection, etc., products that meet certain indicators can only use certification marks on packaging and product surfaces after they have passed the declaration and certification. Has a certain degree of authority.

working principle

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

The generator and battery themselves are not charged. Their two poles have positive and negative charges respectively. The positive and negative charges generate voltage (current is formed by the directional movement of charges under the action of voltage). The charge conductors are inherently present in them, and current is required. You only need to add voltage. When the two poles of the battery are connected to the conductor, the positive and negative charges are released in order to generate current.

Dry batteries, etc. are called power sources. The device that converts alternating current into direct current through a transformer and a rectifier is called a rectifier power supply. The 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 following circuit. Rectified power sources and signal sources are sometimes called power sources.

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

The computer power supply is a closed independent component installed in the main box. Its function is to change the AC power to 5V, -5V, +12V, -12V, +3.3V and other stable DC power through a switching power supply transformer to supply The system version, floppy disk, hard disk drive and various adapter expansion cards in the main box are used for system components.

Generally speaking, if one power supply fails, another backup power supply replaces its power supply. The availability of hardware can be enhanced by providing battery backup for nodes and disks.

The connection between the disk and the power supply circuit should be such that the mirror copies are connected to different power sources. The root disk and its corresponding nodes 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, or it can be powered by a power source other than the nodes in the cluster.

At present, many disk arrays and other rack-mounted systems contain multiple power inputs. They should be deployed as different power inputs on the equipment connected to independent circuit equipment with two or three power inputs. In this way, in general, as long as there is If there is no more than one faulty circuit, the system can continue to operate normally. Therefore, if all hardware in the cluster has 2 or 3 power inputs, at least three independent circuits are required 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 state. In these two states, the volt-ampere product added to the power transistor is very small (when it is turned on) , The voltage is low, the current is large; when it is turned off, the voltage is high, the current is small)/The volt-ampere product on the power device is the loss generated on the power semiconductor device.

Compared with the linear power supply, the more effective working process of the PWM switching power supply is achieved by “chopping”, that is, the input DC voltage is chopped into a pulse voltage whose amplitude is equal to the amplitude of the input voltage. The duty cycle of the pulse is adjusted by the controller of the switching power supply. Once the input voltage is chopped into an AC square wave, its amplitude can be increased or decreased by the transformer. The output voltage value can be increased by increasing the number of secondary windings of the transformer, and finally the DC output voltage is obtained after these AC waveforms are rectified and filtered.

The main purpose of the controller is to keep the output voltage stable, and its working process is very similar to the linear controller. That is to say, the functional blocks, voltage reference and error amplifier of the controller can be designed to be the same as the 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.

Switching power supplies have two main operating modes: forward conversion and boost conversion. Although the layout of their parts is very different, the working process is very different, and each has its own advantages in specific applications.

Power classification

Ordinary power supply

It can be subdivided into: switching power supply, inverter power supply, AC power supply, DC 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, electric operation power supply, adapter power supply, linear power supply, power controller/driver, power supply, other ordinary power supply, inverter power supply, parameter power supply , Voltage regulating 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 kind of power supply.

The so-called special is mainly because the requirements for measuring the technical indicators of the power supply are different from those of commonly used power supplies, which are mainly because 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 output voltage of the power supply is required. Or the current is pulse or some other requirements. This makes the design and production of such power supplies have more special and even stricter requirements than ordinary power supplies.

Special power supplies are generally designed for special loads or occasions, and they are widely used. Mainly include: electroplating electrolysis, anodic oxidation, induction heating, medical equipment, power operation, power test, environmental protection dust removal, air purification, food sterilization, laser infrared, photoelectric Display, etc. In national defense and military affairs, special power sources have more irreplaceable uses than ordinary power sources. They are mainly used for radar navigation, high-energy physics, plasma physics, and nuclear technology research.

Power supply +3.3V

What’s the use of power +3.3V

DDR memory is 3.3V, DDR1 memory is 2.5V and the reference voltage is 1.25V, and DDR2 memory is 1.8V and the reference voltage is 0.9V.

The CPU power supply is dual 12V. 3.3V is mainly used for booting and resetting the 5VSB (standby voltage). The low memory voltage is mostly due to the problem of the exclusion in the memory power supply circuit.

If the capacitor bulges or leaks, replace the capacitor to solve it. Both the optical drive and the hard disk are powered by a set of 12V and 5V.

Solve the abnormal output of power supply 3.3v

The abnormal 3.3V output of the computer power supply indicates that the internal power supply has broken down and needs to be repaired or replaced with a new power supply.

The repair method is to use a screwdriver to disassemble the power supply, first visually check whether there are obvious damaged components, and replace the damaged components, then use a multimeter to check whether there is any damaged original from the power input terminal. After finding the damaged original, remove it and replace it. , Until all the bad originals 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 be started. If the light is on, it means that the power supply still has a short-circuit fault. , Needs to be overhauled again. If it does not light, it means that the power supply has no major short-circuit faults. You can try to measure whether the output of each group is normal. Normal means that the power supply is repaired. If you connect the computer, it can be used normally, it means it is OK. , Needs to be overhauled.

The Links:   NL10276BC30-18L HD44780A00

Author: Yoyokuo