The difference between AT and ATX:
Characteristics of ATX power supply Compared with AT power supply, ATX power supply has added three outputs of "+3.3V, +5Sb and PS-ON". Among them, +3.3V output is mainly used by CPU, while +5Sb and PS-On output reflect the characteristics of ATX power supply. The main feature of ATX power supply is that it does not use the traditional mains switch to control whether the power supply works or not, but uses the combination of "+5Sb and PS-ON" to switch the power supply. As long as the signal level of "PS-ON" is controlled, the power supply can be turned on and off. Turn on the power supply when PS-on is less than 1V, and turn off the power supply when it is greater than 4.5V ..
2. The core circuit of ATX power supply The main conversion circuit of ATX power supply is the same as that of AT power supply, and it is also a "two-tube and half-bridge separately excited" circuit. The PWM controller also uses TL494 to control the chip, but cancels the power switch. Because the mains switch is cancelled, as long as the power cord is connected, there will be a DC voltage of +300V on the conversion circuit, and the auxiliary power supply will also provide working voltage for TL494 to prepare for starting the power supply. ATX power supply is characterized by using the "dead drive control" function of the fourth pin of TL494 chip. When the voltage of this pin is +5V, the ninth, 1 1 pin of TL494 has no output pulse, so that both switches are turned off and the power supply is in a standby state with no voltage output. When the fourth pin is 0V, TL494 has a trigger pulse to provide the switch tube, and the power supply enters the normal working state. One output of the auxiliary power supply is sent to TL494, and the other output gets two signal voltages of "+5Sb" and "PS-On" through the voltage divider circuit, both of which are +5V. The "+5Sb" output is connected to the "power monitoring component" of ATX motherboard as its working voltage, and it is required that the "+5Sb" output can provide the working current of 10mA. The output of "power monitoring component" is connected with "PS-on". When the trigger button switch (non-lock switch) is not pressed, "PS-on" is +5V, which is connected to the positive input terminal of the voltage comparator U 1, while the negative input terminal voltage of U 1 is about 4.5V, which makes the voltage comparator U65438+. When the power monitoring trigger button switch of the main board (installed on the main chassis panel) is pressed, "PS-On" becomes low level, so the output of the voltage comparator U 1 is 0V, and the power supply of the ATX host is turned on. Press the trigger button switch on the panel again to make "PS-on" become +5V again, thus turning off the power supply. At the same time, the program can be used to control the output of the "power monitoring component", so that "PS-on" becomes +5V, and the power supply is automatically turned off. If the shutdown command is issued under WIN9X platform, the ATX power supply will be automatically turned off.
What does this mean? ATX means in computer power supply? The difference between AT power supply and ATX power supply: 1, AT power supply is a standard put forward by IBM when it introduced PC/AT machine in the early days, and it can provide power supply of about 190W at that time. AT power supply must have a power switch to control the switch of the computer. 2.ATX power supply is an industrial standard proposed by Intel in 1995. Since the original ATX 1.0, the ATX standard has undergone many changes and improvements. At present, ATX2.03 and ATX 12V are popular in the domestic market. The main feature of ATX power supply is that it does not use the traditional mains switch to control whether the power supply works, but uses the combination of "+5Sb and PS-ON" to switch the power supply. As long as the level of "PS-ON" signal is controlled, the power supply can be turned on and off. So you can turn off the computer power through the operating system.
What does computer power supply atx 350wp4 mean? ATX power supply type.
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Rated wattage is 350 watts.
What does the model on the computer power supply mean: ATX-400?
Voltage input: 1 15- 120V error correction.
Current input: 6-5.5A error correction
Input frequency range: 60-50Hz error correction.
Rated power: 380W error correction
Other arguments: size: 140* 150*86mm error correction.
+12V 1 output current: 16A Error correction
+3.3V output current: 20A error correction
+5V output current: 20A error correction
+12V2 output current: 18A error correction
Multi-channel+12V output current:-12V:0.5A, +5V *** :2.5A error correction.
Safety certification: CB, CCC, CE, FCC error correction.
Product features: efficiency: 70%
Safe and trouble-free time interval: >100,000 hours, 25 degrees Celsius.
Delay time:16ms error correction
Protection functions: short circuit protection/mains protection/overvoltage protection/overcurrent protection/temperature protection and error correction.
Fan structure: 120mm error correction
PFC: optional passive PFC
What does computer power tuv mean? TUV is a symbol of Rhine certification in Germany, indicating that this power supply conforms to the certification of German security agencies, just like CCC certification in China.
Common sense of TUV certified power supply
Common sense of TUV certified power supply
Common sense of TUV certified power supply
Common sense of TUV certified power supply
I. Purpose
The purpose of applying safety standards is to prevent personal injury and property loss caused by various dangers that may occur in the use of household appliances, mechanical products and automobile products.
Including electric shock or electric shock, overheating or fire, mechanical danger, radioactive danger and chemical danger.
Second, the standard.
The laws and regulations of household appliances all over the world are based on IEC standard IEC60335.
Among them, the European standard is closest to the international standard.
The European standard is divided into two parts: the first part, EN60335- 1, is a comprehensive requirement for household appliances; The second part, EN60335-2, is the special requirements for various household appliances. There are dozens of standards in this part.
Third, safety.
The European electrical safety standard is EN60950, which is also the technical specification for GS certification of TV information products in Germany. For computer monitors, GS certification also includes EN50279 standard and ISO924 1 series standard. Since the safety standards of information products in all countries in the world are based on IEC950 standards of the International Institute of Electrotechnics, enterprises should pay attention to merging and applying for safety certification of other countries when applying for GS certification of TüV in Germany.
Fourth, service.
1. radio and communication product certification consulting service
2. Product testing: short-range wireless devices, wireless local area networks, GSM, CDMA, DECT, Bluetooth, PMR, micro devices, PLG, modems, ISDN, ADSL, xDSL, communication network devices, etc.
3. Test the radio communication equipment according to ETSI standard, American FCC standard and the standards of other countries such as Australia, Singapore and Japan.
4. Information circular of European licensed spectrum
5. Electromagnetic compatibility test
6. Electrical safety and health protection test (SAR evaluation)
7. Test the compatibility and quality of analog and digital terminal equipment.
8. Conduct on-site or public training and discussion on radio and communication equipment.
What does it mean to be in the computer power supply? The cathode of the DC output terminal is directly connected to the black line, and also directly connected to the ground and the power supply shell.
What does the computer power supply double P mean? It means that the power port has changed from four to eight magic connectors, and the corresponding board can choose different connectors.
ATX 12V 2.3 computer power supply. What does this mean? ATX is the standard of power supply structure, and 12V 2.3 means that the output voltage of 12V is version 2.3. This version is backward compatible. The higher the version, the better the scalability. Version 2.3 and above have a special 6-pin interface for graphics card power supply, which enhances the output power of 12v and is suitable for matching with high-power mainstream graphics cards. ATX power supply is omnipotent, so when buying power supply, you should pay attention to the rated power of the power supply.
What does the computer power load refer to, that is, electrical equipment and components connected to the computer power supply;
Load refers to the electronic components connected at both ends of the power supply in the circuit. There should be no load in the circuit, and the two poles of the power supply should be directly connected. This connection is called a short circuit. Commonly used loads are resistors, engines, light bulbs, etc., all of which consume electricity. A device that converts electric energy into other forms of energy is called a load. Motor can convert electric energy into mechanical energy, resistor can convert electric energy into heat energy, light bulb can convert electric energy into heat energy and light energy, and speaker can convert electric energy into sound energy. Motors, resistors, light bulbs and speakers are all called loads. The transistor can also be regarded as the load of the previous signal source. The most basic requirements for the load are impedance matching and the power it can withstand.
The load of communication power supply is communication equipment. For example, the multimedia server needs a communication power supply to power it, and the multimedia server is the load of the communication power supply. Our common communication equipment is the load of communication power supply, such as optical transmission equipment, switching equipment, microwave equipment, core network equipment, communication base station and so on.
What does the computer power supply 300B mean? This is not the rated output. 300B should be the model of power supply, with a rated output of 300W, which is in W, not B, so it is the model of your power supply.