Notebook computer CPU CORE power supply circuit based on WY831M processor

Abstract

The utility model relates to a notebook computer CPU CORE power supply circuit based on a SW WY831M processor. The circuit comprises a WY831M processor, a CPU (Central Processing Unit) CORE voltage output and voltage feedback signal control circuit, a notebook computer mainboard input power supply, an upper MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) PQ1, lower MOSFETs PQ2 and PQ3, an output inductor PL1, an output capacitor and a CPU CORE voltage regulation circuit. The notebook computer CPU CORE power supply circuit based on the SW WY831M processor is used for adjusting the CPU CORE voltage, and can be used for reducing the power consumption of a CPU during light load, prolonging the battery life and improving the user experience.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic computers, in particular to a CPU_CORE power supply circuit of a notebook computer based on the Shenwei WY831M processor. Background Technique

[0002] At present, the domestic market has an increasing demand for domestic computers, and the domestic processor Shenwei WY831M has been successfully trial-produced in the applicant's desktop computer project. The Shenwei WY831M processor has 8 main cores, the highest main core frequency is 2.2GHZ, and the typical power consumption is 20W. In the applicant's desktop computer project, the measured average power consumption of the CPU is 18.9W when idle, and the average power consumption is 19.04W when running 1080P video. For desktop computers, the power consumption of this CPU is not high, but it is too high for notebook computer projects. The excessive power consumption will lead to a shortened battery life of the notebook computer, an increase in the temperature of the D shell, and a poor user experience. Therefore, how to reduce power consumption has become an important issue when designing a notebook computer using the Shenwei WY831M processor.

[0003] The WY831M processor has multiple power management strategies.

[0004] ①. The WY831M processor contains 8 completely identical computing cores. If some computing cores are in the running load state, these cores should be set to the sleep state. The computing core or the external system can send a sleep interrupt to any core through the maintenance command, so that these unloaded computing cores are in the sleep state. The computing core in the sleep state is in the reset state and maintains a low clock frequency (only one-eighth of the maintenance clock frequency). Once the core that needs to sleep resumes the working state, the non-sleeping core or the external system can send a wake-up interrupt to the sleeping core, which can make the sleeping core resume the normal working frequency, end the reset, re-initialize, and boot the operating system to resume the normal working state. The core in the sleep state has almost no dynamic power consumption.

[0005] ②. Reduce the instruction processing speed: The instruction pipeline flow speed of the computing core of the WY831M processor can be dynamically adjusted. Once the core requires lower performance, the instruction pipeline flow speed can be reduced on the basis of meeting the system performance requirements, thereby reducing the dynamic operating power consumption of the computing core.

[0006] ③. The WY831M processor supports the dynamic frequency modulation function of the computing core clock. Inside the WY831M, there are 3 dedicated PLLs for the core. Among them, 2 PLLs provide the core with 2 different frequencies of clocks. The 8 cores on the chip can work at high or low frequencies according to different loads. The 3rd PLL is the PLL used during the frequency modulation process. When the core is working, the 3rd PLL can be pre-configured and up / down frequency modulated. At different core frequencies, the CPU_CORE voltage of the WY831M processor is also different. When the core frequency decreases, the CPU_CORE voltage also decreases, thereby reducing the CPU power consumption.

[0007] Because the CPU of the laptop is not always at full load during use. For example, when the laptop is in the idle state, the occupancy rate of all 8 cores is very low. Cores without load can be turned off to reduce the CPU power consumption. When the occupancy rate of the CPU cores increases, the turned-off cores can be gradually turned on to ensure the normal use of the laptop.

[0008] After confirmation by the supplier of the WY831M processor, the maximum operating frequency of the WY831M computing core is 2.2GHz, and the minimum is 1.2GHz. When the CPU operating frequency is 2.2GHz, the CPU_CORE operating voltage is set to 0.825V. When the CPU operating frequency is 1.2GHz, the CPU_CORE operating voltage is set to 0.71V. When the CPU operating frequency is between 1.2GHz and 2.2GHz, the CPU_CORE operating voltage also needs to change between 0.71V and 0.825V following the change of the CPU operating frequency to meet the CPU operating conditions. After verification, the number of computing cores of the WY831M processor can be adjusted between 2 and 8, and the operating frequency can be adjusted between 1.2GHz and 2.2GHz.

[0009] The WY831M processor supports the dynamic frequency modulation function of the computing core clock, and different frequencies correspond to different CPU_CORE voltages. That is to say, in order to implement various power management strategies, a circuit design that can adjust the CPU_CORE voltage is required. Summary of the Invention

[0010] Therefore, the purpose of the present utility model is to provide a CPU_CORE power supply circuit for a laptop based on the WY831M processor, and this solution can adjust the CPU_CORE voltage.

[0011] The solution includes: a WY831M processor, a CPU_CORE voltage output and voltage feedback signal control circuit, an input power supply for the laptop motherboard, an upper MOSFET PQ1, lower MOSFETs PQ2 and PQ3, an output inductor PL1, an output capacitor, and a CPU_CORE voltage regulation circuit;

[0012] The CPU_CORE voltage regulation circuit includes a power chip RT8237EZQW; the UGATE signal pin of the power chip RT8237EZQW is electrically connected to the gate of the upper MOSFET, the PHASE signal pin is electrically connected to the first end of the output inductor PL1, and the LGATE signal pin is electrically connected to the gates of the lower MOSFETs PQ2 and PQ3; the drain of the upper MOSFET PQ1 is electrically connected to the input power supply of the laptop motherboard, and the source of the upper MOSFET PQ1 is electrically connected to the drains of the lower MOSFETs PQ2 and PQ3 and the first end of the output inductor PL1; the sources of the lower MOSFETs PQ2 and PQ3 are grounded; the second end of the output inductor PL1 is electrically connected to the power pin of the WY831M processor to supply power to the CPU, and the second end of the output inductor PL1 is grounded through the output capacitor; the CPU_CORE should have sufficient output capacitors as filter capacitors to ensure that the power quality meets the CPU's operating requirements;

[0013] The CPU_CORE voltage output and voltage feedback signal control circuit includes MOSFETs PQ4 and PQ5; the gate of MOSFET PQ4 is electrically connected to the CPU_GPIO2 pin of the WY831M processor, the drain is electrically connected to the VFB pin of the power chip RT8237EZQW via a resistor PR13, and the source is electrically connected to the VSS_SENSE pin of the WY831M processor, which is the GND feedback signal of the CPU, and is grounded; the gate of MOSFET PQ5 is electrically connected to the CPU_GPIO4 pin of the WY831M processor, the drain is electrically connected to the VFB pin of the power chip RT8237EZQW via a resistor PR15, and the source is electrically connected to the VSS_SENSE pin of the WY831M processor, which is the GND feedback signal of the CPU, and is grounded. The source is also electrically connected to the VDDCORE_SENSE pin of the WY831M processor and the second end of the output inductor PL1 via a series connection of a resistor PR14 and a resistor PR9.

[0014] Among them, it also includes an embedded single-chip microcomputer for controlling the power-on sequence of the laptop motherboard power supply. The WY831M processor is electrically connected to the embedded single-chip microcomputer, and the embedded single-chip microcomputer is electrically connected to the CPU_CORE power chip RT8237EZQW to control the power-on and power-off of the CPU_CORE.

[0015] Among them, the model of the embedded single-chip microcomputer is IT5571E-128 / CX.

[0016] Among them, the models of the MOSFETs PQ4 and PQ5 are LBSS138WT1G.

[0017] Among them, the resistance value of the resistor PR13 is 15 kΩ, the resistance value of the resistor PR15 is 9.09 kΩ, the resistance value of the resistor PR14 is 68 kΩ, and the resistance value of the resistor PR9 is 1 kΩ.

[0018] Among them, the model of the upper MOSFET is SM4377NSKP.

[0019] Among them, the models of the lower MOSFETs PQ2 and PQ3 are SM4512NHKPC-TRG, and the two are used in parallel to meet the over-current requirement.

[0020] Among them, the 5V power supply of the laptop motherboard is input to the V5IN pin of the power supply chip RT8237EZQW.

[0021] Among them, the power supply of the laptop is an adapter power supply or a battery power supply.

[0022] Among them, the inductance value of the output inductor is 220 nH.

[0023] In summary, the laptop CPU_CORE power supply circuit based on the Shenwei WY831M processor of the present utility model is convenient for adjusting the CPU_CORE voltage. Description of the Drawings

[0024] The following combines the drawings and describes the specific embodiments of the present utility model in detail, and the technical solutions and other beneficial effects of the present utility model will be obvious. In the drawings,

[0025] Figure 1 is the circuit block diagram of a preferred embodiment of the laptop CPU_CORE power supply circuit based on the Shenwei WY831M processor of the present utility model;

[0026] Figure 2 is the CPU_CORE power supply circuit diagram of a preferred embodiment of the laptop CPU_CORE power supply circuit based on the Shenwei WY831M processor of the present utility model;

[0027] Figure 3 is the CPU partial GPIO signal wiring diagram of a preferred embodiment of the laptop CPU_CORE power supply circuit based on the Shenwei WY831M processor of the present utility model. Detailed Description of the Preferred Embodiment

[0028] Combined with Figures 1 to 3, Figure 1 This is a circuit block diagram of a preferred embodiment of the CPU_CORE power supply circuit of a notebook computer based on the Shenwei WY831M processor. Figure 2 This is the CPU_CORE power supply circuit diagram of this preferred embodiment. Figure 2 The power supply circuit related to CPU_CORE is detailedly shown. Figure 3 This is the GPIO signal circuit diagram of the CPU part of this preferred embodiment. Figure 3 It mainly shows the pins CPU_GPIO2 and CPU_GPIO2 on the CPU in the present utility model that are related to adjusting the CPU_CORE voltage.

[0029] The CPU_CORE power supply circuit of the notebook computer based on the Shenwei WY831M processor in the present utility model mainly includes: the WY831M processor, the CPU_CORE voltage output and voltage feedback signal control circuit, the input power supply of the notebook computer motherboard, the upper MOSFET PQ1, the lower MOSFETs PQ2 and PQ3, the output inductor PL1, the output capacitor, and the CPU_CORE voltage regulation circuit. Consistent with the general configuration of the notebook computer motherboard, an embedded controller, i.e., EC, for controlling the power-on timing of the notebook motherboard power supply, and system input devices, etc. are also provided on the motherboard. The WY831M processor is electrically connected to the EC, and the EC is electrically connected to the CPU_CORE voltage feedback signal control circuit;

[0030] When the user turns on the computer and presses the key, the signal PWRBTN_IN# is pulled low. After the EC receives the signal PWRBTN_IN# being pulled low, it confirms that the power-on signal is correct and can power on the motherboard step by step according to the set power-on timing. During the power-on process, the EC sends the CPU_CORE enable signal to the power chip RT8237EZQW to make it start power-on operation and generate the CPU_CORE power supply. System input devices (such as keyboards and mice) are connected to the WY831M processor through the motherboard circuit. After the power-on is completed, the user can set the working mode of the CPU, such as the energy-saving mode, the balanced mode, and the performance mode, in the power options of the desktop menu.

[0031] In this preferred embodiment, the resistance PR11 between the TRIP pin of the power chip RT8237EZQW and the ground is 100 kΩ, making the switching frequency of RT8237EZQW 380 KHz.

[0032] After adopting the circuit of the present utility model, if it is necessary to dynamically adjust the voltage of CPU_CORE following the change of the CPU core frequency, the WY831M processor can adjust the CPU_CORE voltage by adjusting the potential levels output by the two pins CPU_GPIO2 and CPU_GPIO4 to adjust the feedback signal of RT8237EZQW.

[0033] As Figure 2 shown, in the circuit of the present utility model, the main control power supply chip is RT8237EZQW. As Figure 3 shown, the WY831M processor used as the CPU uses its pins GPIO_H2 and GPIO_H4 to emit CPU_GPIO2 and CPU_GPIO4 signals as control signals for adjusting the CPU_CORE voltage. VDD_0V8_SEN_DN and VDD_0V8_SEN_DP are feedback signals from the remote CPU, which are the feedback of the CPU to the GND and CPU_CORE voltages respectively, from the VSS_SENSE pin and VDDCORE_SENSE pin of the CPU, and are input to the corresponding nodes of the CPU_CORE voltage feedback signal control line after passing through resistors PR18 and PR20.

[0034] According to the specification of the power supply chip RT8237EZQW, the calculation formula for the voltage Vout of CPU_CORE is: , where VFB is 0.704V. PQ4 and PQ5 are MOSFETs, with the model number LBSS138WT1G, pin1 is the gate, pin2 is the source, and pin3 is the drain; the resistance value of resistor PR13 is 15 kΩ, the resistance value of PR15 is 9.09 kΩ, the resistance value of PR14 is 68 kΩ, the resistance value of PR9 is 1 kΩ, and the inductance value of the output inductor PL1 is 220 nH.

[0035] When CPU_GPIO2 and CPU_GPIO4 are at high level, the voltage difference between the gate and source of PQ4 and PQ5 is 1.8V. The conduction condition of the drain and source of LBSS138WT1G is VGS>1.5V. At this time, the drain and source of PQ4 and PQ5 are in the conduction state, and the conduction impedance is 5.6 ohm; when CPU_GPIO2 and CPU_GPIO4 are at low level, the voltage difference between the gate and source of PQ4 and PQ5 is 0V, which is lower than the conduction condition of the drain and source of LBSS138WT1G. At this time, the drain and source of PQ4 and PQ5 are in the off state, and the impedance Rds between the drain and source of PQ4 and PQ5 tends to infinity.

[0036] Therefore, when both GPIO_H2 and GPIO_H4 of the CPU are low, the drains and sources of PQ4 and PQ5 are both in the off state, and RdsPQ4 and RdsPQ5 tend to infinity. Substituting into the formula for calculation, we can get Vout = 0.71V; when GPIO_H2 of the CPU is high and GPIO_H4 of the CPU is low, the drain and source of PQ4 are in the on state while the drain and source of PQ5 are in the off state, RdsPQ4 is 5.6 ohm, and RdsPQ5 is infinity. Substituting into the formula, we can get Vout = 0.74V; when GPIO_H2 of the CPU is low and GPIO_H2 of the CPU is high (should be GPIO_H4 high here), the drain and source of PQ4 are in the off state while the drain and source of PQ5 are in the on state, RdsPQ4 is infinity, and RdsPQ5 is 5.6 ohm. Substituting into the formula, we can get Vout = 0.78V; when both GPIO_H2 and GPIO_H4 of the CPU are high, the drains and sources of PQ4 and PQ5 are in the on state, RdsPQ4 and RdsPQ5 are 5.6 ohm. Substituting into the formula for calculation, we can get Vout = 0.825V, as shown in Table 1 below.

[0037] Table 1. CPU GPIO Voltage Regulation Levels

[0038]

[0039] As Figure 3 shown, for the notebook computer of the present utility model, generally speaking, during the boot process of the notebook computer, before entering the system interface, the CPU defaults to start with a maximum of 8 computing cores and the highest operating frequency. Therefore, during the boot process, GPIO_H2 and GPIO_H4 are default set to high voltage, so the CPU_CORE voltage is also at the highest voltage level of 0.825V during the startup process.

[0040] By adopting the circuit of the present utility model, by adjusting the output potentials of the two pins CPU_GPIO2 and CPU_GPIO4 of the WY831M processor, the CPU_CORE voltage can be adjusted as conveniently as shown in the table, and then it can be adapted to implement multiple CPU operating modes, such as setting three modes: energy-saving mode, balanced mode, and performance mode.

[0041] During the boot process, the CPU boots with the highest performance. After entering the system interface, the user can set the operating mode in the system interface.

[0042] In the energy-saving mode, the WY831M processor runs with the lowest power consumption, that is, two computing cores are enabled, and the operating frequency is set to the lowest value of 1.2 GHz. The CPU sets GPIO_H2 and GPIO_H4 to low level, and at this time the CPU_CORE voltage is the lowest value of 0.71V. It maintains the lowest power consumption operation in the energy-saving mode.

[0043] In the performance mode, the CPU operates with a maximum of 8 computing cores and a maximum operating frequency of 2.2 GHz, and the CPU_CORE voltage is 0.825V. The CPU power consumption is the highest in the performance mode.

[0044] In the balanced mode, the number of CPU working cores and the operating frequency are adjusted according to the CPU load changes. The number of computing cores fluctuates between 2 and 8, the CPU operating frequency is adjusted between 1.2 GHz and 2.2 GHz, and the CPU_CORE voltage changes with the CPU operating frequency. When the CPU operates at the lowest frequency of 1.2 GHz, the CPU sets GPIO_H2 and GPIO_H to low level, and the CPU_CORE voltage is 0.71V at this time; when the CPU operating frequency rises to 1.8 GHz, the CPU sets GPIO_H2 to high level and GPIO_H4 to low level, and the CPU_CORE voltage is 0.74V; when the CPU operating frequency rises to 2.0 GHz, the CPU sets GPIO_H2 to low level and GPIO_H4 to high level, and the CPU_CORE voltage is 0.778V; when the CPU operating frequency rises to 2.2 GHz, the CPU sets both GPIO_H2 and GPIO_H4 to high level, and the CPU_CORE voltage is 0.825V. The balanced mode can achieve the goal of reducing power consumption as much as possible while meeting the CPU working requirements.

[0045] After actual measurement, when the overall machine power mode is set to the energy-saving mode or the balanced mode, the CPU power consumption of the overall machine is significantly reduced compared with that in the high-performance mode when the overall machine is in idle and playing videos (1080P). In the energy-saving mode, the CPU is forced to operate with a minimum of 2 cores and a frequency of 1.2 GHz, and the CPU_CORE is set to the lowest 0.71V. The measured CPU power consumptions in idle and playing 1080P videos are 7.91W and 8.01W respectively; in the balanced mode, the CPU enables the automatic frequency modulation, voltage regulation and core adjustment mode. The CPU power consumption in idle is 7.92W, and the CPU power consumption when playing 1080P videos is 10.3W; in the performance mode, the CPU operates with 8 cores and the highest frequency of 2.2 GHz, and the CPU_CORE voltage is 0.825V. At this time, the CPU power consumption in the idle state is 18.9W, and the power consumption when playing 1080P videos is 19.04W.

[0046] In summary, the CPU_CORE power supply circuit of the notebook computer based on the WY831M processor of the present utility model is convenient for adjusting the CPU_CORE voltage, can be used to reduce power consumption when the CPU is under low load, extend the battery life in the battery mode, and improve the user experience.

[0047] As described above, those of ordinary skill in the art can make various corresponding changes and modifications based on the technical solutions and concepts of the present utility model, and all such changes and modifications shall fall within the protection scope of the appended claims of the present utility model.

Claims

1. A notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor, characterized in that, Including: WY831M processor, CPU_CORE voltage output and voltage feedback signal control circuit, input power supply of laptop motherboard, upper MOSFET PQ1, lower MOSFETs PQ2 and PQ3, output inductor PL1, output capacitor, and CPU_CORE voltage regulation circuit; The CPU_CORE voltage regulation circuit includes a power chip RT8237EZQW; the UGATE signal pin of the power chip RT8237EZQW is electrically connected to the gate of the upper MOSFET, the PHASE signal pin is electrically connected to the first end of the output inductor PL1, and the LGATE signal pin is electrically connected to the gates of the lower MOSFETs PQ2 and PQ3; The drain of the upper MOSFET PQ1 is electrically connected to the input power supply of the laptop motherboard, the source of the upper MOSFET PQ1 is electrically connected to the drains of the lower MOSFETs PQ2 and PQ3 and the first end of the output inductor PL1; the sources of the lower MOSFETs PQ2 and PQ3 are grounded; The second end of the output inductor PL1 is electrically connected to the power pin of the WY831M processor to supply power to the CPU, and the second end of the output inductor PL1 is grounded through the output capacitor; The CPU_CORE voltage output and voltage feedback signal control circuit includes MOSFETs PQ4 and PQ5; the gate of MOSFET PQ4 is electrically connected to the CPU_GPIO2 pin of the WY831M processor, the drain is electrically connected to the VFB pin of the power chip RT8237EZQW via the resistor PR13, and the source is electrically connected to the VSS_SENSE pin of the WY831M processor and grounded; the gate of MOSFET PQ5 is electrically connected to the CPU_GPIO4 pin of the WY831M processor, the drain is electrically connected to the VFB pin of the power chip RT8237EZQW via the resistor PR15, the source is electrically connected to the VSS_SENSE pin of the WY831M processor and grounded, and the source is also electrically connected to the VDDCORE_SENSE pin of the WY831M processor and the second end of the output inductor PL1 via the series-connected resistors PR14 and PR9.

2. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 1, characterized in that It also includes an embedded single-chip microcomputer for controlling the power-on sequence of the laptop motherboard power supply. The WY831M processor is electrically connected to the embedded single-chip microcomputer, and the embedded single-chip microcomputer is electrically connected to the CPU_CORE power chip RT8237EZQW to control the power-on and power-off of the CPU_CORE.

3. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 2, characterized in that, The model of the embedded single-chip microcomputer is IT5571E-128 / CX.

4. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 1, wherein, The models of the MOSFETs PQ4 and PQ5 are LBSS138WT1G.

5. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 4, characterized in that The resistance value of the resistor PR13 is 15 kΩ, the resistance value of the resistor PR15 is 9.09 kΩ, the resistance value of the resistor PR14 is 68 kΩ, and the resistance value of the resistor PR9 is 1 kΩ.

6. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 1, wherein, The upper MOSFET is SM4377NSKP.

7. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 1, wherein, The lower MOSFETs PQ2 and PQ3 are SM4512NHKPC-TRG.

8. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 1, characterized in that, The V5IN pin of the power supply chip RT8237EZQW inputs the 5V power supply of the laptop motherboard.

9. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 1, wherein The power supply of the laptop is an adapter power supply or a battery power supply.

10. The notebook computer CPU_CORE power supply circuit based on the Shenwei WY831M processor according to claim 1, characterized in that, The inductance value of the output inductor PL1 is 220 nH.

Images