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When we press the start button, the first thing to start is the power supply (because without power supply, all accessories on the motherboard will not work). However, in order to ensure the safety of use, a series of safety protection measures have been taken in the power supply part; Therefore, there will be a time delay between the start and stability of the switching power supply. After each voltage group is stabilized, each part of the power supply will output a detection signal. When this signal is at a high level, it means that the voltage in this part is normal. These parts include the input voltage and each group of output voltages. The result of the addition of these signals is a good power signal (also called a normal power signal or a normal power signal); If the motherboard does not receive this signal, the clock chip will continue to send a reset signal to the CPU (equivalent to pressing the RESER key), and the CPU will not work. Will the motherboard and CPU start when the CPU receives a normal power signal? In fact, at this time, the motherboard will send the vid0-vid3 signal provided by the CPU to the corresponding port of the power management module according to the vid0-vid3 pin combination defined by the CPU. If the motherboard BIOS has the function of setting CPU voltage, the motherboard will generate a new VID signal according to the corresponding relationship between the set voltage and VID and send it to the power management module chip. The power management module will convert it into a reference voltage according to the set DAC voltage, and then turn it on and off in turn through the field effect transistor, and send energy to the CPU through the inductor. Finally, by adjusting the circuit, the output voltage will be equal to the set voltage.
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Part of the CPU pin is connected with the VID signal pin of the PWM controller chip. When the motherboard starts, the VID signal that sets the CPU core voltage is sent to the VID pin of the PWM controller chip. The DAC digital-to-analog conversion and setting circuit will compile and convert the VID digital signal of the initial voltage sent by the CPU, and send out the reference voltage used when setting the voltage. The pulse width modulation signal output circuit adjusts the duty ratio of the pulse signal according to this reference voltage value, so that the MOSFET tubes are turned on in turn to generate the rated CPU core voltage. The sampling circuit obtains the voltage feedback signal from the output terminal and compares it with the reference voltage. If there is a deviation, the time interval of MOSFET tubes being turned on in turn is adjusted by controlling the pulse signal width, and the corrected CPU core voltage is obtained. Finally, the function of the protection circuit is to monitor the output terminal. If the voltage is too high or too low, the CPU will be suspended to ensure its safety. If we cut off the initial VID signal sent by the CPU to the PWM controller chip, set the core voltage we need through the motherboard hard jumper or BIOS, and then convert it into the corresponding VID signal and send it to the DAC digital-to-analog conversion and setting circuit in the PWM controller chip, then the motherboard will output the corresponding CPU core voltage according to the user's setting, so that the motherboard has the function of accurately adjusting the CPU core voltage.
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Responder: Firefighter-Magic Apprentice Level 1 5- 18 20:43
Can I ask for a change of training profession and agreed punishment?
Ordinary employees, untrained (never before, never again). This is not a job involving confidential information. However, one item in the labor contract involves confidential information and has not expired, and the compensation is 1000 yuan. If the employee has been trained and has not expired, the compensation will be 1000 yuan.
Answer: I am an idiot apprentice of La-Magic, level 1 5- 19 23: 10.
czxt.bbs.ful.cn
Operating system forum
It's nice here. Take a look.
Respondent: qding Lin- probation period level 1 5-22 19: 13.