A dynamically adjustable power supply voltage output circuit and electronic device

Abstract

The application provides a dynamically adjustable power supply voltage output circuit and electronic equipment, and relates to the technical field of electronic equipment, and solves the problem that the power supply output of the existing electronic equipment cannot adapt to different types of memory power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic circuits, in particular to a dynamically adjustable power supply voltage output circuit and electronic equipment. BACKGROUND

[0002] For electronic equipment (such as notebook mainboards or desktop mainboards) with multiple and multiple value voltage specification input requirements, it needs to output multiple voltage specifications such as 5V, 3.3V, 1.8V, 1.2V, 1.1V, 1.05V, and 0.6V. The output scheme selection of different power supplies leads to material differences, resulting in many types of materials, design differences, and inability to standardize mature solutions for rapid transplantation and mass production promotion. Specifically, for example: two different types of LPDDR4 and LPDDR4X in memory particle design, only one VDDQ voltage value difference (LPDDR4, VDDQ = 1.1V, LPDDR4X, VDDQ = 0.6V), and the current general design is a PCB with different voltage design output values to support the design requirements of the two memory particles. The design and development cycle is long and the development difficulty is high.

[0003] Therefore, the present application is proposed. SUMMARY

[0004] The present application discloses a dynamically adjustable power supply voltage output circuit and electronic equipment, aiming to solve the problem that the power output of the existing electronic equipment cannot adapt to different models of memory power supply.

[0005] The first embodiment of the present application provides a dynamically adjustable power supply voltage output circuit, comprising: a step-down circuit, a first voltage regulating circuit, a second voltage regulating circuit, a controller, a first resistance network, and a second resistance network.

[0006] The input end of the step-down circuit is used to connect a power supply, the output end of the step-down circuit is electrically connected with the input end of the first resistance network, the output end of the first resistance network is electrically connected with the sampling end of the controller, the control end of the first voltage regulating circuit and the control end of the second voltage regulating circuit are electrically connected with the output end of the controller, the output end of the first voltage regulating circuit and the output end of the second voltage regulating circuit are electrically connected with the output end of the first resistance network, and the second resistance network is electrically connected with the input end of the controller.

[0007] The controller is configured to realize the following steps by executing the computer program stored therein.

[0008] An access signal of the second resistance network is obtained, and an enable signal is generated to the step-down circuit according to the access signal.

[0009] The voltage value at the output terminal of the first resistor network is collected, and it is determined whether the voltage value meets the preset output based on the access signal;

[0010] When it is determined that the voltage value does not meet the preset output, a first control signal is output to the first voltage regulating circuit or a second control signal is output to the second voltage regulating circuit to adjust the output voltage of the first resistor network.

[0011] Preferably, when it is determined that the voltage value does not meet the preset output, outputting a first control signal to the first voltage regulating circuit or outputting a second control signal to the second voltage regulating circuit to adjust the output voltage of the first resistor network specifically involves:

[0012] When the voltage value is determined to be lower than a preset value, a first control signal is output to the first voltage regulation circuit to increase the output voltage of the first resistor network;

[0013] When the voltage value is determined to be higher than a preset value, a second control signal is output to the second voltage regulation circuit to reduce the output voltage of the first resistor network.

[0014] Preferably, the step-down circuit includes: a step-down chip, a first capacitor, a second capacitor, and an inductor;

[0015] The input terminal of the step-down chip is connected to the power supply through the first capacitor. The BST pin of the step-down chip is electrically connected to the SW pin of the step-down chip through the second capacitor. The first end of the inductor is electrically connected to the SW pin of the step-down chip, and the second end of the inductor is electrically connected to the input terminal of the first resistor network.

[0016] Preferably, the first resistor network includes: a first resistor and a second resistor;

[0017] The step-down chip's FB terminal is electrically connected to the first terminal of the first resistor, the second terminal of the first resistor is grounded, the first terminal of the first resistor is electrically connected to the first terminal of the second resistor, and the second terminal of the second resistor is electrically connected to the second terminal of the inductor.

[0018] Preferably, the first voltage regulating circuit includes: a first MOSFET and a third resistor;

[0019] In this configuration, the gate (G) of the first MOSFET is electrically connected to the output terminal of the controller, the source (S) of the first MOSFET is grounded, the drain (D) of the first MOSFET is electrically connected to the first terminal of the third resistor, and the second terminal of the third resistor is electrically connected to the second terminal of the first resistor.

[0020] Preferably, the second voltage regulating circuit includes: a second MOSFET and a fourth resistor;

[0021] The gate (G) of the second MOSFET is electrically connected to the output terminal of the controller, the source (S) of the second MOSFET is electrically connected to the first terminal of the second resistor, and the drain (D) of the second MOSFET is electrically connected to the second terminal of the second resistor through the fourth resistor.

[0022] Preferably, the second resistor network includes a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;

[0023] Wherein, the first end of the fifth resistor is electrically connected to the first end of the sixth resistor, the second end of the fifth resistor is grounded through the seventh resistor, the second end of the sixth resistor is grounded through the eighth resistor, the second ends of the fifth resistor and the sixth resistor are electrically connected to the input terminal of the controller, and the first ends of the fifth resistor and the sixth resistor are electrically connected to the power supply.

[0024] A second embodiment of the present invention provides an electronic device, including a power supply and a dynamically adjustable power supply voltage output circuit as described in any of the above claims, wherein the power supply is electrically connected to the input terminal of the step-down circuit.

[0025] Based on the dynamically adjustable power supply voltage output circuit and electronic device provided by the present invention, the controller collects the memory access status through the second resistor network, generates an enable signal to the step-down circuit, and determines the voltage required by the accessed memory according to the access status. By collecting the output voltage of the first resistor network and determining whether the output voltage meets the voltage required by the accessed memory, when the output voltage is determined to be lower than a preset value, a first control signal is output to the first voltage regulation circuit to increase the output of the first resistor network. When the output voltage is determined to be higher than the preset value, a second control signal is output to the second voltage regulation circuit to decrease the output of the first resistor network. This solves the problem that the power output of existing electronic devices cannot be adapted to the power supply of different types of memory. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a dynamically adjustable power supply voltage output circuit provided in the first embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the steps of the controller provided by the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] This invention discloses a dynamically adjustable power supply voltage output circuit and electronic device, which aims to solve the problem that the power output of existing electronic devices cannot be adapted to the power supply of different models of memory.

[0031] Please see Figure 1 The first embodiment of the present invention provides a dynamically adjustable power supply voltage output circuit, including: a step-down circuit, a first voltage regulating circuit, a second voltage regulating circuit, a controller, a first resistor network, and a second resistor network;

[0032] Wherein, the input terminal of the step-down circuit is used to connect to the power supply, the output terminal of the step-down circuit is electrically connected to the input terminal of the first resistor network, the output terminal of the first resistor network is electrically connected to the sampling terminal of the controller, the control terminals of the first voltage regulating circuit and the second voltage regulating circuit are electrically connected to the output terminal of the controller, the output terminals of the first voltage regulating circuit and the second voltage regulating circuit are electrically connected to the output terminal of the first resistor network, and the second resistor network is electrically connected to the input terminal of the controller;

[0033] It should be noted that existing electronic devices (such as laptop motherboards or desktop motherboards) require various voltage output specifications, including 5V, 3.3V, 1.8V, 1.2V, 1.1V, 1.05V, and 0.6V. Different power supply output schemes lead to material differences, resulting in a large variety of materials and design variations, hindering the standardized, rapid porting and mass production of mature solutions. For example, two different types of memory chips, LPDDR4 and LPDDR4X, differ only in their VDDQ voltage value (LPDDR4, VDDQ = 1.1V, LPDDR4X, VDDQ = 0.6V). Current technology uses PCBs with different output voltages to support these two memory chips, resulting in long design and development cycles and high development difficulty.

[0034] In one possible embodiment of the present invention, the second resistor network includes a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;

[0035] Wherein, the first end of the fifth resistor is electrically connected to the first end of the sixth resistor, the second end of the fifth resistor is grounded through the seventh resistor, the second end of the sixth resistor is grounded through the eighth resistor, the second ends of the fifth resistor and the sixth resistor are electrically connected to the input terminal of the controller, and the first ends of the fifth resistor and the sixth resistor are electrically connected to the power supply.

[0036] In this embodiment, the controller collects the memory access status through the second resistor network, for example, determining whether the memory model is LPDDR4 or LPDDR4X. Specifically, in this embodiment, by judging the high and low combination (00, 01, 10, 11) of the pins connected to the second resistor network, when it is determined that MEM_ID0 / MEM_ID1 = 00, the connected memory is LPDDR4, and its required voltage value is 1.1V. When it is determined that MEM_ID0 / MEM_ID1 = 01, the connected memory is LPDDR4X, and its required voltage value is 0.6V. An enable signal is output to the buck circuit to start working, and the output voltage of the first resistor network is collected in real time to determine whether the output voltage meets the voltage required by the connected memory. If not, the first voltage regulation circuit and the second voltage regulation circuit are used to adjust the voltage so that the sampled voltage value is infinitely close to the required set output voltage value.

[0037] In this embodiment, the controller can be an STM32F103. Of course, in other embodiments, other types of chips can also be used. No specific limitation is made here, but these solutions are all within the protection scope of this invention.

[0038] Please see Figure 2The controller is configured to perform the following steps by executing a computer program stored internally:

[0039] S101, Obtain the access signal of the second resistor network, and generate an enable signal to the buck circuit based on the access signal;

[0040] S102, Collect the voltage value at the output terminal of the first resistor network, and determine whether the voltage value meets the preset output based on the access signal;

[0041] S103, when it is determined that the voltage value does not meet the preset output, a first control signal is output to the first voltage regulating circuit or a second control signal is output to the second voltage regulating circuit to adjust the output voltage of the first resistor network.

[0042] Specifically, in this embodiment, when it is determined that the voltage value is lower than a preset value, a first control signal is output to the first voltage regulation circuit to increase the output voltage of the first resistor network;

[0043] When the voltage value is determined to be higher than a preset value, a second control signal is output to the second voltage regulation circuit to reduce the output voltage of the first resistor network.

[0044] In one possible embodiment of the present invention, the step-down circuit includes: a step-down chip, a first capacitor, a second capacitor, and an inductor;

[0045] The input terminal of the step-down chip is connected to the power supply through the first capacitor. The BST pin of the step-down chip is electrically connected to the SW pin of the step-down chip through the second capacitor. The first end of the inductor is electrically connected to the SW pin of the step-down chip, and the second end of the inductor is electrically connected to the input terminal of the first resistor network.

[0046] It should be noted that the first capacitor, the second capacitor, and the inductor form a filter circuit, which is used to filter out noise before the power supply is input to the step-down circuit and noise output to the subsequent circuit after step-down. In other embodiments, the filter circuit can also be composed of other electronic components connected together. No specific limitation is made here, but these solutions are all within the protection scope of this invention.

[0047] In one possible embodiment of the present invention, the first resistor network includes: a first resistor and a second resistor;

[0048] The step-down chip's FB terminal is electrically connected to the first terminal of the first resistor, the second terminal of the first resistor is grounded, the first terminal of the first resistor is electrically connected to the first terminal of the second resistor, and the second terminal of the second resistor is electrically connected to the second terminal of the inductor.

[0049] It should be noted that the first resistor and the second resistor constitute the setting resistor network for the external output design voltage value, +V_OUT=Vfb*(1+R1 / R2), where Vfb is the output sample value collected by the FB pin of the buck chip.

[0050] In one possible embodiment of the present invention, the first voltage regulating circuit includes: a first MOSFET and a third resistor;

[0051] In this configuration, the gate (G) of the first MOSFET is electrically connected to the output terminal of the controller, the source (S) of the first MOSFET is grounded, the drain (D) of the first MOSFET is electrically connected to the first terminal of the third resistor, and the second terminal of the third resistor is electrically connected to the second terminal of the first resistor.

[0052] In one possible embodiment of the present invention, the second voltage regulating circuit includes: a second MOSFET and a fourth resistor;

[0053] The gate (G) of the second MOSFET is electrically connected to the output terminal of the controller, the source (S) of the second MOSFET is electrically connected to the first terminal of the second resistor, and the drain (D) of the second MOSFET is electrically connected to the second terminal of the second resistor through the fourth resistor.

[0054] It should be noted that the controller's sampling terminal collects the +V_OUT voltage level in real time and compares it with the design requirement settings (1.1 and 0.6) mentioned above. Simultaneously, the controller runs a predetermined PWM width adjustment program (if the sampled voltage output value is less than the design requirement setting, the PWM duty cycle width of PWM_OUT can be increased; if the sampled voltage output value is greater than the design requirement setting, the PWM duty cycle width of PWM_OUT can be decreased), dynamically adjusting the PWM_OUT duty cycle width to accurately match the design requirement's set output voltage value. Specifically, in this embodiment:

[0055] a) +V_OUT = Vfb * (1 + R2 / Rb), where Q1 is dynamically turned on and off. The variable resistance value of R3 is introduced and connected in parallel with the original circuit design resistance R1 to generate a new calculated equivalent value Rb. This can realize the incremental voltage value adjustment (voltage value increase) of the reference design voltage value +V_OUT = Vfb * (1 + R2 / Rb) in the larger direction.

[0056] b) +V_OUT=Vfb*(1+Ra / R1), where Q2 is dynamically turned on and off. The variable R4 dynamic variable resistance value is introduced and connected in parallel with the original circuit design R2 resistance to generate a new calculated equivalent value Ra. This can realize the reduction of the reference voltage value +V_OUT=Vfb*(1+Ra / R1) in the direction of the voltage value (voltage value decreases).

[0057] A second embodiment of the present invention provides an electronic device, including a power supply and a dynamically adjustable power supply voltage output circuit as described in any of the above claims, wherein the power supply is electrically connected to the input terminal of the step-down circuit.

[0058] Based on the dynamically adjustable power supply voltage output circuit and electronic device provided by the present invention, the controller collects the memory access status through the second resistor network, generates an enable signal to the step-down circuit, and determines the voltage required by the accessed memory according to the access status. By collecting the output voltage of the first resistor network and determining whether the output voltage meets the voltage required by the accessed memory, when the output voltage is determined to be lower than a preset value, a first control signal is output to the first voltage regulation circuit to increase the output of the first resistor network. When the output voltage is determined to be higher than the preset value, a second control signal is output to the second voltage regulation circuit to decrease the output of the first resistor network. This solves the problem that the power output of existing electronic devices cannot be adapted to the power supply of different types of memory.

[0059] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions that fall within the scope of the present invention are within the scope of protection of the present invention.

Claims

1. A dynamically adjustable power supply voltage output circuit, characterized in that, include: A step-down circuit, a first voltage regulator circuit, a second voltage regulator circuit, a controller, a first resistor network, and a second resistor network; The input terminal of the step-down circuit is used to connect to the power supply, the output terminal of the step-down circuit is electrically connected to the input terminal of the first resistor network, and the output terminal of the first resistor network is electrically connected to the sampling terminal of the controller. The first voltage regulating circuit includes a first MOSFET and a third resistor; the second voltage regulating circuit includes a second MOSFET and a fourth resistor; the first resistor network includes a first resistor and a second resistor; the gate (G) of the first MOSFET and the gate (G) of the second MOSFET are electrically connected to the output terminal of the controller; the source (S) of the first MOSFET is grounded; the drain (D) of the first MOSFET is electrically connected to the first terminal of the third resistor; the second terminal of the third resistor is electrically connected to the second terminal of the first resistor; the source (S) of the second MOSFET is electrically connected to the first terminal of the second resistor; the drain (D) of the second MOSFET is electrically connected to the second terminal of the second resistor through the fourth resistor; the output terminal of the second voltage regulating circuit is electrically connected to the output terminal of the first resistor network; the second resistor network is electrically connected to the input terminal of the controller; and the controller collects the memory access status through the second resistor network. The first end of the first resistor is grounded, the FB terminal of the step-down chip of the step-down circuit is electrically connected to the second end of the first resistor, the second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the second resistor serves as the output terminal of the first resistor network. The controller is configured to perform the following steps by executing a computer program stored internally: The access signal of the second resistor network is obtained, and an enable signal is generated for the buck circuit based on the access signal. The voltage value at the output terminal of the first resistor network is collected, and it is determined whether the voltage value meets the preset output based on the access signal; When the voltage value is determined to be lower than a preset value, a first control signal is output to turn on the first MOS transistor and connect it in series with the third resistor, so as to use the third resistor to increase the output voltage of the first resistor; When the voltage value is determined to be higher than the preset value, a second control signal is output to turn on the second MOS transistor and connect it in series with the fourth resistor, so as to use the fourth resistor to lower the output voltage of the second resistor.

2. The dynamically adjustable power supply voltage output circuit according to claim 1, characterized in that, The step-down circuit includes: a step-down chip, a first capacitor, a second capacitor, and an inductor; The input terminal of the step-down chip is connected to the power supply and grounded through the first capacitor. The BST pin of the step-down chip is electrically connected to the SW pin of the step-down chip through the second capacitor. The first end of the inductor is electrically connected to the SW pin of the step-down chip, and the second end of the inductor is electrically connected to the output terminal of the first resistor network.

3. The dynamically adjustable power supply voltage output circuit according to claim 1, characterized in that, The second resistor network includes a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor; Wherein, the first end of the fifth resistor is electrically connected to the first end of the sixth resistor, the second end of the fifth resistor is grounded through the seventh resistor, the second end of the sixth resistor is grounded through the eighth resistor, the second ends of the fifth resistor and the sixth resistor are electrically connected to the input terminal of the controller, and the first ends of the fifth resistor and the sixth resistor are electrically connected to the power supply.

4. An electronic device, characterized in that, The device includes a power supply and a dynamically adjustable power supply voltage output circuit as described in any one of claims 1 to 3, wherein the power supply is electrically connected to the input terminal of the step-down circuit.

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