CN216286562U

CN216286562U - Universal CPU power supply circuit and terminal equipment

Info

Publication number: CN216286562U
Application number: CN202121335278.6U
Authority: CN
Inventors: 王志远; 李优斌
Original assignee: Shenzhen Kongdao Intelligent Technology Co ltd
Current assignee: Shenzhen Kongdao Intelligent Technology Co ltd
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2022-04-12
Anticipated expiration: 2031-06-16

Abstract

The embodiment of the utility model discloses a universal CPU power supply circuit and terminal equipment, wherein the CPU power supply circuit comprises an enabling module, a driving module and an output module; the driving module is connected with the enabling module and the output module, and the enabling module and the output module are both connected with the CPU; the enabling module delays an enabling signal output by the CPU and then outputs a corresponding driving signal; the driving module controls the output state of the switching signal according to the driving signal and performs circuit protection, and the output module generates working voltage according to the switching signal, sets the voltage value of the working voltage and outputs the working voltage to supply power to the CPU. The multi-output power supply of the PMU chip is changed into single-path independent power supply, the working voltages with different voltages can be generated according to the voltage requirement of the CPU, the limitation of shortage of the PMU chip is avoided, the power supply control of the CPU is more flexible, the universality is stronger, and the requirement of the market on diversified power scheme products is met.

Description

Universal CPU power supply circuit and terminal equipment

Technical Field

The utility model relates to the technical field of electronics, in particular to a universal CPU power supply circuit and terminal equipment.

Background

A CPU (central processing unit) is one of the main devices of an electronic computer, and a core component of the computer, and therefore, a power supply module of the CPU is very important.

The 1.05V power supply scheme adopted by the existing CPU is a PMU (power management unit, which is a power management chip) integration scheme, one PMU chip controls multi-output power supply, but the packaging of the chip is large, the occupied PCB (printed Circuit Board) space is large, the Layout difficulty of the Layout is large, the Circuit is complex, the Debug difficulty is large, and the product has no market competitive advantage. Once the PMU chip has supply shortage, a proper chip is difficult to find for replacing in a short time, and a replacement scheme cannot be found, so that the product requirement of a market diversified power scheme cannot be met, and the universality is poor; and most of power supply circuits of related products need to be modified, so that the research and development cost and the modification cost of the circuits are increased.

SUMMERY OF THE UTILITY MODEL

In view of the above technical problems, embodiments of the present invention provide a general CPU power supply circuit and a terminal device, so as to solve the problem that the current CPU power supply circuit using a PMU chip has poor versatility.

The embodiment of the utility model provides a universal CPU power supply circuit which is connected with a CPU and comprises an enabling module, a driving module and an output module; the driving module is connected with the enabling module and the output module, and the enabling module and the output module are both connected with the CPU;

the enabling module delays an enabling signal output by the CPU and then outputs a corresponding driving signal;

the driving module controls the output state of the switching signal according to the driving signal and performs circuit protection;

the output module generates working voltage according to the switching signal, sets the voltage value of the working voltage, and outputs the working voltage to supply power to the CPU.

Optionally, in the general CPU power supply circuit, the enabling module includes a first switching tube, a second switching tube, a first capacitor, a first resistor, a second resistor, and a third resistor;

the base electrode of the first switch tube is connected with one end of a first resistor and one end of a first capacitor, the other end of the first resistor is connected with an enabling pin of the CPU, the other end of the first capacitor and the emitting electrode of the first switch tube are grounded, the collector electrode of the first switch tube is connected with the grid electrode of the second switch tube and one end of the second resistor, and the other end of the second resistor is connected with a first power supply end; the source electrode of the second switch tube is grounded, the drain electrode of the second switch tube is connected with one end of the third resistor and the driving module, and the other end of the third resistor is connected with the first power supply end.

Optionally, in the general CPU power supply circuit, the enabling module further includes a second capacitor, one end of the second capacitor is connected to the drain of the second switching tube and the driving module, and the other end of the second capacitor is grounded.

Optionally, in the general CPU power supply circuit, the driving module includes a power chip, a fourth resistor, and a third capacitor;

the IN pin of the power chip is connected with a second power end, the EN pin of the power chip is connected with the drain electrode of the second switch tube, the BST pin of the power chip is connected with one end of the third capacitor through the fourth resistor, the SW pin of the power chip is connected with the other end of the third capacitor and the output module, the FB pin of the power chip is connected with the output module, and the GND pin of the power chip is grounded.

Optionally, in the general CPU power supply circuit, the output module includes an inductor, a fifth resistor, a sixth resistor, a seventh resistor, and a fourth capacitor;

one end of the inductor is connected with an SW pin of the power supply chip; the other end of the inductor is connected with one end of the seventh resistor, one end of the fourth capacitor and the power supply end; the other end of the seventh resistor is connected with one end of the fifth resistor, one end of the sixth resistor and the other end of the fourth capacitor; the other end of the fifth resistor is connected with the FB pin of the power supply chip, and the other end of the sixth resistor is grounded.

Optionally, in the general CPU power supply circuit, the output module further includes a fifth capacitor and a sixth capacitor, and one end of the fifth capacitor is connected to one end of the sixth capacitor, the power supply end, and the other end of the inductor; the other end of the fifth capacitor and the other end of the sixth capacitor are both grounded.

Optionally, in the general CPU power supply circuit, the first switching tube is an NPN transistor, and the second switching tube is an NMOS tube.

Optionally, in the general CPU power supply circuit, a resistance value of the first resistor is 1K Ω, and a capacitance value of the first capacitor is 1 uF.

Optionally, in the general CPU power supply circuit, a resistance of the sixth resistor is 13.7K Ω, and a resistance of the seventh resistor is 4.2K Ω.

A second aspect of the embodiments of the present invention provides a terminal device, including a motherboard, where the motherboard is provided with a CPU, and the motherboard is further provided with the general CPU power supply circuit, and the general CPU power supply circuit is connected to the CPU;

the general CPU power supply circuit controls the output state of the working voltage according to the enable signal output by the CPU, also sets the voltage of the working voltage, and outputs the working voltage to the CPU for power supply.

In the technical scheme provided by the embodiment of the utility model, the universal CPU power supply circuit comprises an enabling module, a driving module and an output module; the driving module is connected with the enabling module and the output module, and the enabling module and the output module are both connected with the CPU; the enabling module delays an enabling signal output by the CPU and then outputs a corresponding driving signal; the driving module controls the output state of the switching signal according to the driving signal and performs circuit protection, and the output module generates working voltage according to the switching signal, sets the voltage value of the working voltage and outputs the working voltage to supply power to the CPU. The multi-path output power supply of the prior PMU chip is changed into single-path independent power supply, the working voltages of different voltages can be generated according to the voltage requirement of the CPU and supplied independently, the limitation of shortage of the PMU chip is avoided, the power supply control of the CPU is more flexible, the universality is stronger, and the requirement of the market on diversified power scheme products is met. The circuit protection greatly improves the safety and stability of the circuit.

Drawings

Fig. 1 is a block diagram of a terminal device according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of a general CPU power supply circuit in the embodiment of the present invention.

FIG. 3 is a circuit diagram of a CPU according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive step, belong to the protection scope of the present invention.

Referring to fig. 1 and fig. 2, a terminal device according to an embodiment of the present invention includes a main board, where a general CPU power supply circuit 10 and a CPU (central processing unit) 20 are disposed on the main board, and the general CPU power supply circuit 10 is connected to the CPU 20. The general CPU power supply circuit 10 controls the output state (i.e., whether to output) of the operating voltage +1P05 according to the enable signal PMU _ SLP _ S3 output by the CPU, further sets the voltage level of the operating voltage +1P05, and outputs the operating voltage to the CPU for power supply. The single-path and single-type voltage output is adopted to replace the multi-path output power supply of the PMU chip, the PMU chip is not needed, the power supply cannot be influenced even if the PMU chip is in shortage, and because the working voltage can be set, the plurality of CPU power supply circuits 10 can generate a plurality of different voltages to meet the power supply requirement of the CPU, and the universality of the circuit is improved.

The terminal equipment is a desktop computer, an all-in-one machine, a server, a tablet personal computer, a notebook computer, a mobile phone (especially a smart phone) and the like, is internally provided with a CPU, and needs to supply power to the CPU.

In this embodiment, the general CPU power supply circuit 10 includes an enabling module 110, a driving module 120, and an output module 130; the driving module 120 is connected with the enabling module 110 and the output module 130, and both the enabling module 110 and the output module 130 are connected with the CPU; the enabling module 110 delays an enabling signal PMU _ SLP _ S3 output by the CPU and outputs a corresponding driving signal EN; the driving module 120 controls the output state of the switching signal PHASE according to the driving signal EN and performs circuit protection, and the output module 130 generates a working voltage +1P05 according to the switching signal PHASE and sets a voltage value of the working voltage +1P05, and outputs the working voltage +1P05 to supply power to the CPU.

The embodiment changes the multiplexed output power supply of the prior PMU chip into single-path independent power supply, can generate working voltages of different voltages according to the voltage requirement of the CPU and supply power independently, is not limited by the shortage of the PMU chip any more, has more flexible power supply control of the CPU and stronger universality, and meets the requirement of the market on diversified power scheme products. The circuit protection comprises short-circuit protection, overcurrent protection, undervoltage protection, over-temperature protection and other protection functions, and the safety and stability of the circuit are greatly improved.

With reference to fig. 2 and fig. 3, the enable module 110 includes a first switch Q1, a second switch Q2, a first capacitor C1, a first resistor R1, a second resistor R2, and a third resistor R3; a base (B) of the first switch tube Q1 is connected to one end of the first resistor R1 and one end of the first capacitor C1, the other end of the first resistor R1 is connected to an enable pin of the CPU (providing an enable signal pmuslp _ S3, in this embodiment, the enable pin is a pmuslp _ SLP _ S3 pin of the CPU, in specific implementation, if the CPU changes the model or the pin name, the enable pin is changed correspondingly), the other end of the first capacitor C1 and an emitter (E) of the first switch tube Q1 are both grounded, a collector (C) of the first switch tube Q1 is connected to a gate (G) of the second switch tube Q2 and one end of the second resistor R2, and the other end of the second resistor R2 is connected to a first power supply terminal (providing a first voltage +3.3 VSB); the source (S) of the second switch Q2 is grounded, the drain (D) of the second switch Q2 is connected to one end of the third resistor R3 and the driving module 120, and the other end of the third resistor R3 is connected to the first power source terminal.

The first switch tube Q1 is preferably an NPN triode with the type of MMBT3904, and the second switch tube Q2 is preferably an NMOS tube with the type of L2N7002LT 1G. A delay circuit is formed by a first resistor R1 (the resistance value is preferably 1K omega) and a first capacitor C1 (the capacitance value is preferably 1uF), and the first switch tube Q1 is controlled to be conducted after delaying for a preset time so as to meet the power-on time sequence of the CPU; the second resistor R2 and the third resistor R3 are used for protecting the connected switching tube, and can also prevent the first voltage +3.3VS from being directly grounded to influence the normal work of the switching tube when the connected switching tube is conducted, so as to protect the connected switching tube.

When the CPU detects that the enable signal PMU _ SLP _ S3 output after power-on is at a high level, the first switching tube Q1 is turned on to pull down the gate voltage of the second switching tube Q2 to a low level, the second switching tube Q2 is turned off, and the first voltage +3.3VS at the high level is used as the driving signal EN to control the driving module 120 to start. When the power supply needs to be stopped, the enable signal PMU _ SLP _ S3 is at a low level, the first switching tube Q1 is turned off, the first voltage +3.3VSB at the high level controls the second switching tube Q2 to be turned on, and at this time, the driving signal EN is pulled down to a low level to control the driving module 120 to stop working.

Preferably, the enabling module 110 further includes a second capacitor C2 (with a capacitance value of preferably 1uF), one end of the second capacitor C2 is connected to the drain (D) of the second switching transistor Q2 and the driving module 120, and the other end of the second capacitor C2 is grounded.

The second capacitor C2 is used for filtering the driving signal, so that the driving module 120 operates more stably, and also has a time delay function, so as to increase the time delay and control the driving module to operate in a delayed manner.

The driving module 120 comprises a power chip U1, a fourth resistor R4 and a third capacitor C3; the IN pin of the power chip U1 is connected to a second power supply terminal (providing a second voltage +5VSB), the EN pin of the power chip U1 is connected to the drain (D) of the second switch tube Q2, the BST pin of the power chip U1 is connected to one end of the third capacitor C3 through the fourth resistor R4, the SW pin of the power chip U1 is connected to the other end of the third capacitor C3 and the output module 130, the FB pin of the power chip U1 is connected to the output module 130, and the GND pin of the power chip U1 is grounded.

The power supply chip U1 is preferably MP1658GTF-Z, and has high yield, low cost and easy finding other chips with similar functions for replacement in the market. MP1658GTF-Z is a monolithic step-down switch mode converter with built-in internal power MOSFET, it can obtain a 2A continuous output current in the input voltage of 2.5V-6V, provide PWM (pulse width modulation) signal for the internal MOSFET drive module through the internal logic module of power chip U1, and then control two internal MOSFET tubes of High/Low side to do switch work by the MOSFET drive module, then output switch signal PHASE from SW pin of power chip U1 to output module 130 for processing, and then obtain the 1.05V working voltage +1P05 required by CPU.

The FB pin of the power chip U1 serves as a feedback pin, the voltage on the FB pin is used for setting the voltage value of the working voltage +1P05, and the voltage on the FB pin and the output module together control the finally output working voltage +1P 05. The power supply chip U1 has good load and line regulation functions, constant output voltage, small voltage ripple, stable signal and small conduction time, thereby providing a rapid transient response function and stabilizing a feedback loop. Meanwhile, the power supply chip U1 is internally provided with protection functions such as short-circuit protection, overcurrent protection, undervoltage protection and overtemperature protection, so that the circuit works more safely and stably. The fault condition protection of the power chip U1 includes cycle-by-cycle current limiting and thermal shutdown. The MP1658GTF-Z is packaged by a small TSOT23-8, and occupies little space of a PCB.

IN order to make the operation of the power chip U1 more stable, 2 capacitors (one capacitor value is preferably 22uF, and the other capacitor value is preferably 0.1uF) may be connected IN parallel between the IN pin of the power chip U1 and the ground to filter the operating power of the power chip U1.

The output module 130 comprises an inductor L1, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a fourth capacitor C4; one end of the inductor L1 is connected with an SW pin of the power chip U1; the other end of the inductor L1 is connected to one end of the seventh resistor R7, one end of the fourth capacitor C4, and the power supply end (output operating voltage +1P 05); the other end of the seventh resistor R7 is connected with one end of the fifth resistor R5, one end of the sixth resistor R6 and the other end of the fourth capacitor C4; the other end of the fifth resistor R5 is connected to the FB pin of the power chip U1, and the other end of the sixth resistor R6 is grounded.

The switch signal PHASE output by the SW pin of the power chip U1 is filtered and stored energy through an inductor L1 (the inductance value is preferably 1.0uH), and then is divided by a seventh resistor R7 and a sixth resistor R6 on the FB pin, so that 1.05V of working voltage +1P05 can be output, and working power supply is provided for the CPU. The voltage value of the working voltage +1P05 can be adjusted by changing the resistance of the seventh resistor R7 or the sixth resistor R6. The calculation formula of the working voltage +1P05 is as follows: VOUT is 0.807 × (1+ R7/R6) in V, 0.807 is the reference voltage on the FB pin. In this embodiment, the resistance of the seventh resistor R7 is preferably 4.2K Ω, and the resistance of the sixth resistor R6 is preferably 13.7K Ω. The fourth resistor R4 and the third capacitor C3 form a boost circuit for applying a voltage to the gate of the MOSFET transistor inside the power chip U1. A fifth resistor R5 (preferably 20K omega) is used for matching and a fourth capacitor C4 is used for compensation.

Preferably, the output module 130 further includes a fifth capacitor C5 and a sixth capacitor C6, and one end of the fifth capacitor C5 is connected to one end of the sixth capacitor C6, the power supply terminal, and the other end of the inductor L1; the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are both grounded.

The fifth capacitor C5 and the sixth capacitor C6 are used for filtering the working voltage +1P05 and then transmitting the working voltage to the CPU for supplying power. All pins in the CPU that require 1.05V operating voltage are connected to the power supply terminal, that is, the operating voltage +1P05 can be obtained, the pins that require 1.05V operating voltage are shown in fig. 3, which is only an example here, the pin names can be changed according to the model of the CPU, the power supply terminal can be connected to any pin that requires 1.05V voltage, and the model of the CPU is not limited. Only the pins related to the present embodiment are shown here, and the connection relationship of the other pins is the prior art and will not be described in detail here.

It should be understood that, in this embodiment, the working voltage is 1.05V, and the specific circuit may modify the values of some devices (for example, R6 and R7) according to the voltage value; or adjusting the circuit properly, such as increasing or decreasing some devices to adjust the driving size and the output current size, changing the model of the power chip (corresponding to the peripheral circuit of the modified chip), and so on.

With reference to fig. 1 to fig. 3, the operation principle of the mobile terminal is as follows:

after power-up, a second voltage +5VSB is input from the IN pin of the power chip U1, and +5V is supplied to the power chip U1.

The CPU outputs a high-level enable signal PMU _ SLP _ S3 to control the first switching tube Q1 to be switched on and the second switching tube Q2 to be switched off after the time delay of the first resistor R1 and the first capacitor C1, and the high-level first voltage +3.3VS is used as a driving signal EN to control the power chip U1 to be switched on and work. The switching signal PHASE output by the SW pin of the power chip U1 is filtered by the inductor L1 to store energy, and then divided by the seventh resistor R7 and the sixth resistor R6 to output 1.05V of working voltage +1P05, and the working voltage +1P05 is filtered by the fifth capacitor C5 and the sixth capacitor C6 and then transmitted to the CPU for power supply.

When the 1.05V power supply needs to be stopped, the enable signal PMU _ SLP _ S3 output by the CPU is at a low level, the first switching tube Q1 is turned off, the second switching tube Q2 is turned on, at this time, the driving signal is pulled down to a low level, the control power chip U1 stops working, and no working voltage +1P05 is output.

In summary, the general CPU power supply circuit and the terminal device provided by the utility model can set the output working voltage according to the voltage required by the CPU, the used power supply chip has small package, the circuit is simple, the occupied PCB space is small, the Layout space of the PCB Layout can be saved, the Layout difficulty is small, and the Debug maintenance is facilitated. The output of the used power supply chip is large and common in the market, other replaceable chips with similar functions can be found, the output voltage value can be set, and the universality and compatibility of the circuit are improved. The protection circuit has the protection functions of short circuit, overcurrent, undervoltage, overvoltage, overtemperature and the like, and is stable in performance and high in safety.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A general CPU power supply circuit is connected with a CPU and is characterized by comprising an enabling module, a driving module and an output module; the driving module is connected with the enabling module and the output module, and the enabling module and the output module are both connected with the CPU;

2. The general CPU power supply circuit according to claim 1, wherein the enabling module comprises a first switch tube, a second switch tube, a first capacitor, a first resistor, a second resistor and a third resistor;

3. The general CPU power supply circuit according to claim 2, wherein the enabling module further comprises a second capacitor, one end of the second capacitor is connected to the drain of the second switching tube and the driving module, and the other end of the second capacitor is grounded.

4. The general CPU power supply circuit according to claim 2, wherein the driving module comprises a power chip, a fourth resistor and a third capacitor;

5. The universal CPU power supply circuit according to claim 4, wherein said output module comprises an inductor, a fifth resistor, a sixth resistor, a seventh resistor and a fourth capacitor;

6. The general CPU power supply circuit according to claim 5, wherein the output module further comprises a fifth capacitor and a sixth capacitor, one end of the fifth capacitor is connected to one end of the sixth capacitor, the power supply end and the other end of the inductor; the other end of the fifth capacitor and the other end of the sixth capacitor are both grounded.

7. The general CPU power supply circuit according to claim 2, wherein the first switching transistor is an NPN transistor, and the second switching transistor is an NMOS transistor.

8. The general CPU power supply circuit according to claim 2, wherein the resistance of the first resistor is 1K Ω, and the capacitance of the first capacitor is 1 uF.

9. The general CPU power supply circuit according to claim 5, wherein the resistance of the sixth resistor is 13.7K Ω, and the resistance of the seventh resistor is 4.2K Ω.

10. A terminal device, comprising a main board, wherein the main board is provided with a CPU, and further provided with a general CPU power supply circuit according to any one of claims 1 to 9; the general CPU power supply circuit is connected with the CPU;