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How Computer Motherboard Power Supply Works

ATX12V EPS12V power supply circuits from the module to be + 12v voltage, converted to the (central processing unit, memory, chipset, etc.). Power supply module circuit from the ATX12V EPS12V get + 12v voltage, converted to the (central processing unit, memory , chipsets, etc.). This conversion is a DC-DC converter, also known as switching power supplies, as like the PC-power supply. This conversion is a DC-DC converter, also known as switching power supplies, as like the PC-power supply.

PWM-pulse width modulation controller is the heart of this process. PWM-pulse width modulation controller is the heart of this process. PWM square wave signal generated by phase, from the signal determined by the load voltage, that is, its duty cycle is proportional to the output target (for example, 50% duty cycle: half the time the output is low potential - usually a zero potential, the other 50% of the time the output of high potential - this time for the power supply module + 12v. PWM square wave signal generated by the phase from the signal determined by the load voltage, that is, its duty cycle is proportional to the output target value (for example, 50% duty cycle: half the time the output is low potential - usually a zero potential, and 50% of the time the output of high potential - this time for the power supply module + 12v.

Power supply module output voltage value must be read from the processor's "voltage ID" (VID) pins (called hard to change the voltage),, which must provide a binary code and a precise voltage value. Power supply module output voltage must be read obtained from the processor's "voltage ID" (VID) pins (called hard to change the voltage),, which must provide a binary code and a precise voltage value. Some of the motherboard in the BIOS allowed you to manually change the CPU voltage. Some of the motherboard in the BIOS allowed you to manually change the CPU voltage. PWM is set to change the code, followed PWM has been configured will change according to your CPU voltage. Is to change the PWM settings for the code, followed PWM has been configured will change according to your CPU voltage. We are talking about the CPU voltage regulation also applies to memory and chipset. We are talking about the CPU voltage regulation also applies to memory and chipset.
DC-DC converter is a closed-loop system. DC-DC converter is a closed-loop system. This means that ongoing monitoring of the output PWM controller, power supply module output voltage. This means that ongoing monitoring of the output PWM controller, power supply module output voltage. If the voltage increase or decrease the output circuit will adjust itself (change the frequency of pulse-width modulated signal) in order to output the correct voltage. If the voltage increase or decrease the output circuit will adjust itself (change the frequency of pulse-width modulated signal ) in order to output the correct voltage. As well as the successful completion of the same and vice versa. As well as the successful completion of the same and vice versa.
Figure 15's circuit often appeared CPU module power supply PWM controller (NCP5392). Figure 15 of the circuit often appeared in CPU power module's PWM Controller (NCP5392). You can easily identify the definition of voltage pin (VID0 to VID7), loop pin (CS, in the left of the current sensor pin) and the phase output driver (located in the right G needle,). You can easily identifiable voltage is defined pin (VID0 to VID7), loop pin (CS, in the left of the current sensor pin) and the phase output driver (located on the right G needle,). As you can see, the IC can control the four phases. As you can see, the IC can control the four phases




Figure 15: PWM controller.





Each phase uses two MOSFET and an inductor. Each phase uses two MOSFET and an inductor. PWM does not provide enough current switching of these MOSFET, so each phase requires a MOSFET driver. PWM does not provide enough current switching of these MOSFET, so each phase requires a MOSFET driver. Usually MOSFET driver is a small integrated circuit. Usually MOSFET driver is a small integrated circuit. Some manufacturers low-end motherboard in order to reduce the cost of using a discrete MOSFET do for driving. Some manufacturers low-end motherboard in order to reduce the cost of using a discrete MOSFET is done for driving.
In Figure 16 you can see the basic diagram of a phase plate (loop omitted) from a NCP5359 MOSFET driver. In Figure 16 you can see the basic diagram of a phase plate (loop omitted) from a NCP5359 MOSFET driver. EPS12V ATX12V supply MOSFET and the MOSFET driver (his mark on the "10 V to 13.2 V" and "4v to 15 V). In this diagram you can see two MOSFET capacitance and inductance. This feedback signal and the inductor and the CS + (CSP) and CS-(CSN) pin in parallel. The provision of these pin and a PWM enable terminal EN to activate the circuit. EPS12V ATX12V supply MOSFET and the MOSFET driver (his mark on the "10 V to 13.2 V" and " 4v to 15 V). In this diagram you can see two MOSFET capacitance and inductance. This feedback signal and the inductor and the CS + (CSP) and CS-(CSN) pin parallel. The PWM to provide these pin and an enable terminal EN to activate the circuit.



Figure 16: Single-phase schematic diagram of





As you can see in Figure 15, each phase has a PWM signal output. As you can see in Figure 15, each phase has a PWM signal output. Need to explain that the pulse width modulation signal is a pulse-width (duty cycle) change depending on the load voltage, square wave (which is why this technique is called pulse-width modulation). Need to explain that the pulse-width modulated signal is a pulse-width (duty cycle) change depending on the load voltage, square wave (which is why this technique is called pulse-width modulation). Assuming that this output voltage stability, all the pulse-width modulated signal will have the same width, that is, each square wave "signal" are the same. Assume that the output voltage stability, all the pulse-width modulated signal will have the same pulse width, that is, each square wave "signal" are the same. However, there is a delay between them. However, there is a delay between them. Depends on the phase alternation. Depends on the phase alternation.
For example, in a circuit, only two-phase, the two PWM signals will be run separately. For example, in a circuit, only two-phase, the two PWM signals will be run separately. So when the first phase is opened, the second phase will be turned off, and vice versa. So when the first phase is opened, the second phase will be turned off, and vice versa. This will ensure that each phase will be 50% of the time. This will ensure that each phase will be 50% of the time. Of a circuit of four-phase pulse-width modulated signal will be in the same way will start: the first phase appears first, and then the second phase is activated, then the third phase, and then four-phase. On a circuit The four-phase pulse-width modulated signal will be in the same way will start: the first phase appears first, and then the second phase is activated, then the third phase, and then four-phase. When a phase is open to all the other people are turned off. When a phase is open to all the other people are turned off. In this case, each phase will account for 25%. In this case, each phase will account for 25%.
Additional phase, each phase to open less time. More phases, each phase to open less time. As previously explained, which makes each MOSFET to reduce heat release, components last longer. As previously explained, which makes each MOSFET to reduce heat release, components last longer.

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