Step-down control circuit, circuit board and network attached storage device

Abstract

The utility model relates to the technical field of power supplies, in particular to a step-down control circuit, a circuit board and network additional storage equipment. Comprising a step-down controller, a first step-down module, a second step-down module and an output module, voltage input ends of the first step-down module, the second step-down module and the output module are connected with a power supply, control ends of the first step-down module and the second step-down module are connected with the step-down controller, and a control end of the output module is connected with the MCU; the step-down controller comprises a first enabling end and a second enabling end, the first enabling end is connected with the MCU, and the second enabling end is connected with the voltage output end of the first step-down module; the output voltage of the first step-down module is used as a control signal of the second step-down module and the output module, and when the external MCU controls the step-down controller to be closed, the electric energy output of the first step-down module, the second step-down module and the output module can be directly cut off, so that the subsequent power supply is cut off, and the low-power-consumption work is realized; therefore, the sleep test requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply, in particular to a step-down control circuit, a circuit board and a network attached storage device. Background Art

[0002] NAS is a special data storage server and a simplified operating system designed for users. It can directly add storage devices to the network through a standardized network topology chain without the need for a server and does not rely on a general operating system, making the management and setup of the entire system simpler. A step-down module is required in the NAS system to convert the input voltage into a variety of output voltages to power various functional modules. The current control principle of the power supply circuit of the NAS system is complex and cannot meet the energy-saving requirements of completely cutting off the power during hibernation to enter low power consumption.

[0003] Therefore, it is very important for those skilled in the art to design a simple, reliable and energy-saving buck control circuit for a NAS system. Utility Model Content

[0004] The embodiment of the utility model provides a simple, reliable and energy-saving step-down control circuit for a NAS system, so as to solve the problem that the power supply control circuit of the NAS system in the prior art is too complicated.

[0005] The utility model discloses a step-down control circuit, which is applied to a NAS system. The scheme of the circuit is that it comprises: a step-down controller, a first step-down module, a second step-down module and an output module; the voltage input ends of the first step-down module, the second step-down module and the output module are all connected to an external power supply, the control ends of the first step-down module and the second step-down module are all connected to the step-down controller, and the control end of the output module is connected to an external MCU; wherein the step-down controller comprises a first enabling end and a second enabling end, the first enabling end is connected to the external MCU, and the second enabling end is connected to the voltage output end of the first step-down module.

[0006] Among them, a preferred solution is that a first MOS tube is further arranged between the first enable end and the external MCU, the gate of the first MOS tube is connected to the external MCU, the drain of the first MOS tube is connected to the first enable end, and the source of the first MOS tube is grounded.

[0007] Among them, a preferred solution is that the buck controller includes a first buck output terminal and a second buck output terminal, the first buck output terminal is connected to the gate of the first MOS tube, and the second buck output terminal is connected to the drain of the first MOS tube.

[0008] Among them, a preferred solution is to further include a first feedback module and a second feedback module, the first feedback module is arranged between the voltage output end of the first buck module and the buck controller, and the second feedback module is arranged between the voltage output end of the second buck module and the buck controller.

[0009] Among them, a preferred solution is that the first step-down module includes a first voltage input terminal, a second MOS tube, a third MOS tube, a first energy storage element and a first voltage output terminal, the gates of the second MOS tube and the third MOS tube are both connected to the step-down controller, the drain of the second MOS tube is connected to the first voltage input terminal, the source of the second MOS tube is respectively connected to the drain of the third MOS tube and one end of the first energy storage element, the other end of the first energy storage element is connected to the first voltage output terminal, and the source of the third MOS tube is grounded.

[0010] Among them, a preferred solution is that the first energy storage element is a first inductor, and a first filtering sub-circuit is provided between the first inductor and the first voltage output terminal.

[0011] Among them, a preferred solution is that the second step-down module includes a second voltage input terminal, a fourth MOS tube, a fifth MOS tube, a second energy storage element and a second voltage output terminal, the gates of the fourth MOS tube and the fifth MOS tube are both connected to the step-down controller, the drain of the fourth MOS tube is connected to the second voltage input terminal, the source of the fourth MOS tube is respectively connected to the drain of the fifth MOS tube and one end of the second energy storage element, the other end of the second energy storage element is connected to the second voltage output terminal, and the source of the fifth MOS tube is grounded.

[0012] Among them, a preferred solution is that the second energy storage element is a second inductor, and a second filtering sub-circuit is provided between the second inductor and the second voltage output terminal.

[0013] Among them, a preferred solution is that the output module includes a third voltage input terminal, a sixth MOS tube, a seventh MOS tube, a switch tube and a third voltage output terminal, the gate of the sixth MOS tube is connected to the external MCU, the drain of the sixth MOS tube is connected to the gate of the seventh MOS tube, the drain of the seventh MOS tube is connected to the gate of the switch tube, the source of the switch tube is connected to the third voltage input terminal, and the drain of the switch tube is connected to the third voltage output terminal.

[0014] In order to solve the problems existing in the prior art, the utility model further provides a circuit board, and its solution is that the circuit board includes the step-down control circuit as described above.

[0015] In order to solve the problems existing in the prior art, the utility model further provides a network attached storage device, and its solution is to include the circuit board as described above, or include the voltage reduction control circuit as described above.

[0016] Compared with the prior art, the beneficial effect of the buck control circuit provided by the embodiment of the utility model is that: by setting a buck control circuit, including a buck controller having a first enable end and a second enable end, a first buck module, a second buck module and an output module, multiple outputs of different voltages are achieved to meet the power supply requirements of different power-consuming modules, wherein the first buck module is turned on or off by controlling the first enable end, and the output voltage of the first buck module is used as the control signal of the second enable end to control the second buck module to be turned on or off, and the output voltage of the first buck module is used as the control signal of the MCU to control the output module to be turned on or off. When the external MCU controls the buck controller to be turned off, the power output of the first buck module, the second buck module and the output module can be directly cut off, thereby cutting off the power supply of subsequent functional modules, so that the system enters a sleep state to achieve low power consumption operation, thereby meeting the requirements of the sleep test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution of the utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] In the figure:

[0019] Figure 1 The system frame of the step-down control circuit provided by the embodiment of the utility model Figure 1 ;

[0020] Figure 2 It is a partial circuit diagram of a buck controller provided by an embodiment of the utility model;

[0021] Figure 3 The system frame of the step-down control circuit provided by the embodiment of the utility model Figure 2 ;

[0022] Figure 4 is a circuit diagram of a first step-down module provided in an embodiment of the utility model;

[0023] Figure 5 is a circuit diagram of a second step-down module provided in an embodiment of the utility model;

[0024] Figure 6 It is a circuit diagram of an output module provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Now, in conjunction with the accompanying drawings, a preferred embodiment of the present utility model is described in detail.

[0026] like Figures 1 to 6 As shown, the utility model provides a specific embodiment of a voltage reduction control circuit.

[0027] A step-down control circuit is used in NAS system. Figure 1 The buck control circuit includes a buck controller 1, a first buck module 2, a second buck module 3 and an output module 4; the voltage input ends of the first buck module 2, the second buck module 3 and the output module 4 are all connected to the external power supply 20, the control ends of the first buck module 2 and the second buck module 3 are all connected to the buck controller 1, and the control end of the output module 4 is connected to the external MCU 10;

[0028] The buck controller 1 includes a first enable terminal EN1 and a second enable terminal EN2 . The first enable terminal EN1 is connected to the external MCU 10 , and the second enable terminal EN2 is connected to the voltage output terminal of the first buck module 2 .

[0029] Specifically, refer to Figure 1 The buck controller 1 adopts a dual-channel buck controller 1, which includes a first enable terminal EN1, and the first enable terminal EN1 is connected to the external MCU10 to obtain a level signal, thereby controlling the opening or closing of the first buck module 2 and the output module 4; the dual-channel buck controller 1 also includes a second enable terminal EN2, and the second enable terminal EN2 is connected to the voltage output terminal of the first buck module 2 to obtain a level signal, thereby controlling the opening or closing of the second buck module 3.

[0030] refer to Figure 1 The voltage input end of the first step-down module 2 is connected to an external 12V power supply, the voltage output end of the first step-down module 2 is connected to other power-consuming functional modules to output a 5V voltage, the control end of the first step-down module 2 is connected to the control pin of the step-down controller 1, and the first step-down module 2 is controlled to be turned on or off through the control pin of the step-down controller 1.

[0031] refer to Figure 1 The voltage input end of the second step-down module 3 is connected to the external 12V power supply, the voltage output end of the second step-down module 3 is connected to other power-consuming functional modules to output 3V voltage, the control end of the second step-down module 3 is connected to another control pin of the step-down controller 1, and the opening or closing of the first step-down module 2 is controlled by another control pin of the step-down controller 1.

[0032] refer to Figure 1The voltage input end of the output module 4 is connected to an external 12V power supply, the voltage output end of the output module 4 is used to connect to other power-consuming functional modules to output a 12V voltage, the control end of the output module 4 is connected to the external MCU10, and the external MCU10 controls the output module 4 to be turned off when the output voltage of the first step-down module 2 is not received. The external MCU10 controls the output module 4 to be turned on after receiving the 5V voltage output by the first step-down module 2.

[0033] When the system is started and running, the external MCU10 outputs a level signal to the first enable terminal EN1, so that the first enable terminal EN1 is pulled high. When the first enable terminal EN1 is pulled high, the buck controller 1 controls the first buck module 2 to turn on through the control pin to output a 5V voltage; the second enable terminal EN2 is pulled high and enabled after obtaining the 5V voltage, and the buck controller 1 controls the second buck module 3 to turn on through another control pin to output a 3V voltage, and the external MCU10 controls the output module 4 to turn on after obtaining the 5V voltage to output a 12V voltage.

[0034] When entering the standby state, the external MCU10 outputs a level signal to the first enable terminal EN1, so that the first enable terminal EN1 is pulled low, the buck controller 1 is turned off, the first buck module 2 is turned off, there is no 5V voltage output, the external MCU10 does not obtain the 5V voltage, the control output module 4 is turned off, and there is no 5V voltage input to the second enable terminal EN2, the second enable terminal EN2 is pulled low, and the second buck module 3 is turned off.

[0035] In the present embodiment, a buck control circuit is provided, including a buck controller having a first enable end and a second enable end, a first buck module, a second buck module and an output module, so that multiple outputs of different voltages are realized to meet the power supply requirements of different power-consuming modules, wherein the first buck module is turned on or off by controlling the first enable end, and the output voltage of the first buck module is used as a control signal of the second enable end to control the second buck module to be turned on or off, and the output voltage of the first buck module is used as a control signal of the MCU to control the output module to be turned on or off. When the external MCU controls the buck controller to be turned off, the power output of the first buck module, the second buck module and the output module can be directly cut off, thereby cutting off the power supply of subsequent functional modules, so that the system enters a sleep state to achieve low power consumption operation, thereby meeting the requirements of the sleep test.

[0036] In one embodiment, reference Figure 1 and Figure 2A first MOS tube Q1 is also arranged between the first enable terminal EN1 and the external MCU10, a gate G of the first MOS tube Q1 is connected to the external MCU10, a drain D of the first MOS tube Q1 is connected to the external 5V voltage and the first enable terminal EN1 respectively, and a source S of the first MOS tube Q1 is grounded; when the external MCU10 outputs a low level to the gate G of the first MOS tube Q1, the first MOS tube Q1 is turned off, the external 5V voltage is connected to the first enable terminal EN1, the first enable terminal EN1 is pulled high and enabled, the buck controller 1 is turned on, and the buck controller 1 controls the first buck module 2 to be turned on through its control pin to stably output a 5V voltage.

[0037] Furthermore, the buck controller 1 also includes a first buck output terminal ATX_3V and a second buck output terminal ATX_5V. When the buck controller 1 is powered on, a 12V voltage will be input to the voltage input terminal VIN of the buck controller 1 so that the buck controller 1 is awakened. After waking up, the buck controller 1 will output a 3V voltage to the gate of the first MOS tube Q1 through the first buck output terminal ATX_3V, and output a 5V voltage to the drain of the first MOS tube Q1 through the second buck output terminal ATX_5V. When the external MCU10 outputs a control signal to turn on the first MOS tube Q1, a high level will be output to the first enable terminal EN1, so that the first enable terminal EN1 is pulled high to enable, thereby controlling the first buck module 2 to be turned on.

[0038] In one embodiment, reference Figure 1 and Figure 3 The buck control circuit also includes a first feedback module 5 and a second feedback module 6. The first feedback module 5 is arranged between the voltage output end of the first buck module 2 and the buck controller 1, and the second feedback module 6 is arranged between the voltage output end of the second buck module 3 and the buck controller 1.

[0039] Specifically, refer to Figure 3 and Figure 4 The first feedback module 5 and the second feedback module 6 are both used to detect the output voltage and compare the detected output voltage with the set value to ensure that the output voltage is stable at the set value. The first feedback module 5 includes a resistor R241, a capacitor C219 and a resistor R321. One end of the resistor R241 is connected to the voltage output end of the first buck module 2, and the other end of the resistor R241 is respectively connected to the feedback pin FB1 of the buck controller 1 and one end of the resistor R321. The other end of the resistor R321 is grounded, one end of the capacitor C219 is connected to the voltage output end of the first buck module 2, and the other end of the capacitor C219 is connected to the feedback pin FB1 of the buck controller 1.

[0040] refer to Figure 3 and Figure 5The second feedback module 6 includes a resistor R239, a resistor R320 and a capacitor C217, one end of the resistor R239 is connected to the voltage output end of the second buck module 3, the other end of the resistor R239 is respectively connected to the feedback pin FB2 of the buck controller 1 and one end of the resistor R320, the other end of the resistor R320 is grounded, one end of the capacitor C217 is connected to the voltage output end of the second buck module 3, and the other end of the capacitor C217 is connected to the feedback pin FB2 of the buck controller 1.

[0041] In one embodiment, reference Figure 1 and Figure 4 The first step-down module 2 includes a first voltage input terminal 12V_VIN, a second MOS tube Q2, a third MOS tube Q3, a first energy storage element and a first voltage output terminal 5VSB. The gates G of the second MOS tube Q2 and the third MOS tube Q3 are both connected to the step-down controller 1, the drain D of the second MOS tube Q2 is connected to the first voltage input terminal, the source S of the second MOS tube Q2 is respectively connected to the drain D of the third MOS tube Q3 and one end of the first energy storage element, the other end of the first energy storage element is connected to the first voltage output terminal 5VSB, and the source S of the third MOS tube Q3 is grounded.

[0042] Specifically, refer to Figure 1 and Figure 4 The first voltage input terminal is connected to an external 12V power supply to input a 12V voltage. The first energy storage element is a first inductor L1, which is used to step down the input 12V voltage into a 5V voltage and output it to other power-consuming functional modules through the first voltage output terminal 5VSB. The second MOS tube Q2 and the third MOS tube Q3 are used to control the opening or closing of the first step-down module 2.

[0043] refer to Figure 2 and Figure 4 When the first enable terminal EN1 is pulled high and enabled, the buck controller 1 controls the second MOS tube Q2 to turn on and the third MOS tube Q3 to turn off, so as to turn on the first buck module 2. The 12V voltage inputted from the first voltage input terminal will pass through the buck module composed of the inductor L1 and the second MOS tubes Q2 and Q3, output 5V voltage to the first voltage output terminal 5VSB, and output through the first voltage output terminal 5VSB, thereby realizing the conversion of 12V into 5V output.

[0044] Among them, reference Figure 4 A first filtering subcircuit is provided between the first inductor L1 and the first voltage output terminal 5VSB. The first filtering subcircuit includes capacitor C213, capacitor C214, capacitor C215 and capacitor C216. Capacitor C213, capacitor C214, capacitor C215 and capacitor C216 are connected in parallel.

[0045] In one embodiment, reference Figure 1 and Figure 5 The second step-down module 3 includes a second voltage input terminal 12V_VIN, a fourth MOS transistor Q4, a fifth MOS transistor Q5, a second energy storage element and a second voltage output terminal 3VSB. The gates G of the fourth MOS transistor Q4 and the fifth MOS transistor Q5 are both connected to the step-down controller 1. The drain D of the fourth MOS transistor Q4 is connected to the second voltage input terminal 12V_VIN. The source S of the fourth MOS transistor Q4 is respectively connected to the drain D of the fifth MOS transistor Q5 and one end of the second energy storage element. The other end of the second energy storage element is connected to the second voltage output terminal 3VSB. The source S of the fifth MOS transistor Q5 is grounded.

[0046] Specifically, refer to Figure 1 and Figure 5 The second voltage input terminal is connected to an external 12V power supply to input a 12V voltage. The second energy storage element is a second inductor L2, which is used to step down the input 12V voltage into a 3V voltage and output it to other power-consuming functional modules through the second voltage output terminal 3VSB. The fourth MOS tube Q4 and the fifth MOS tube Q5 are used to control the opening or closing of the second step-down module 3.

[0047] refer to Figure 2 and Figure 5 When the first enable terminal EN1 is pulled high and enabled, the buck controller 1 is turned on, and controls the second MOS tube Q2 to be turned on and the third MOS tube Q3 to be turned off, so as to turn on the first buck module 2. The 12V voltage inputted from the first voltage input terminal will pass through the buck module composed of the inductor L1 and the second MOS tubes Q2 and Q3, output a 5V voltage to the first voltage output terminal 5VSB, and output through the first voltage output terminal 5VSB. At this time, the second enable terminal EN2 obtains the 5V voltage and is enabled. The buck controller 1 controls the fourth MOS tube Q4 to be turned on and the fifth MOS tube Q5 to be turned off, so as to turn on the second buck module 3. The 12V voltage inputted from the second voltage input terminal will pass through the buck module composed of the inductor L2 and the MOS tubes Q4 and Q5, output a 3V voltage to the second voltage output terminal 3VSB, and output through the second voltage output terminal 3VSB, thereby realizing the conversion of 12V into 3V output.

[0048] Among them, reference Figure 5 A second filtering subcircuit is provided between the second inductor L2 and the second voltage output terminal 3VSB. The first filtering subcircuit includes capacitor C79, capacitor C80, capacitor C143 and capacitor C149; capacitor C79, capacitor C80, capacitor C143 and capacitor C149 are connected in parallel.

[0049] In one embodiment, reference Figure 6The output module 4 includes a third voltage input terminal, a sixth MOS tube Q6, a seventh MOS tube Q7, a switch tube Q8 and a third voltage output terminal +12V, the gate G of the sixth MOS tube Q6 is connected to the external MCU 10, the drain D of the sixth MOS tube Q6 is connected to the gate G of the seventh MOS tube Q7, the drain D of the seventh MOS tube Q7 is connected to the gate G of the switch tube Q8, the source S of the switch tube Q8 is connected to the external power supply 20, and the drain D of the switch tube Q8 is connected to the third voltage output terminal +12V.

[0050] Specifically, refer to Figure 6 The third voltage input terminal is connected to an external 12V power supply to input a 12V voltage, the third voltage output terminal +12V is connected to an external power-consuming functional module (such as a hard disk fan, etc.) to provide a 12V voltage, the switch tube Q8 is arranged between the third voltage input terminal and the third voltage output terminal +12V to control the on-off of the power supply circuit, and the sixth MOS tube Q6 and the seventh MOS tube Q7 are used to control the on-off of the switch tube.

[0051] refer to Figure 2 , Figure 4 and Figure 6 When the first enable terminal EN1 is pulled high and enabled, the buck controller 1 is turned on, and controls the second MOS tube Q2 to be turned on and the third MOS tube Q3 to be turned off, so as to turn on the first buck module 2. The 12V voltage inputted from the first voltage input terminal will pass through the buck module composed of the inductor L1 and the MOS tubes Q2 and Q3, and output the 5V voltage to the first voltage output terminal 5VSB, and output it through the first voltage output terminal 5VSB. At this time, the external MCU 10 detects the 5V voltage outputted from the first voltage output terminal 5VSB, and controls the sixth MOS tube Q6 and the seventh MOS tube Q7 to be turned off, thereby controlling the switch tube Q8 to be turned on, and the 12V voltage inputted from the third voltage input terminal will be outputted to the third voltage output terminal +12V through the switch tube, and outputted through the third voltage output terminal +12V.

[0052] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present utility model rather than to limit it. For those skilled in the art, the technical solutions described in the above embodiments can be modified, or some of the technical features therein can be replaced by equivalents; and all these modifications and replacements should fall within the scope of protection of the claims attached to the present utility model.

Claims

1. A step-down control circuit, applied to a NAS system, characterized in that: include: A buck controller, a first buck module, a second buck module and an output module; the voltage input ends of the first buck module, the second buck module and the output module are all connected to an external power supply, the control ends of the first buck module and the second buck module are all connected to the buck controller, and the control end of the output module is connected to an external MCU; wherein the buck controller includes a first enable end and a second enable end, the first enable end is connected to the external MCU, and the second enable end is connected to the voltage output end of the first buck module.

2. The step-down control circuit according to claim 1, characterized in that: A first MOS tube is further provided between the first enabling terminal and the external MCU, the gate of the first MOS tube is connected to the external MCU, the drain of the first MOS tube is connected to the first enabling terminal, and the source of the first MOS tube is grounded.

3. The step-down control circuit according to claim 2, characterized in that: The buck controller includes a first buck output terminal and a second buck output terminal, wherein the first buck output terminal is connected to the gate of the first MOS transistor, and the second buck output terminal is connected to the drain of the first MOS transistor.

4. The step-down control circuit according to claim 1, characterized in that: It also includes a first feedback module and a second feedback module, wherein the first feedback module is arranged between the voltage output end of the first buck module and the buck controller, and the second feedback module is arranged between the voltage output end of the second buck module and the buck controller.

5. The step-down control circuit according to claim 1, characterized in that: The first step-down module includes a first voltage input terminal, a second MOS tube, a third MOS tube, a first energy storage element and a first voltage output terminal. The gates of the second MOS tube and the third MOS tube are both connected to the step-down controller, the drain of the second MOS tube is connected to the first voltage input terminal, the source of the second MOS tube is respectively connected to the drain of the third MOS tube and one end of the first energy storage element, the other end of the first energy storage element is connected to the first voltage output terminal, and the source of the third MOS tube is grounded.

6. The step-down control circuit according to claim 5, characterized in that: The first energy storage element is a first inductor, and a first filtering subcircuit is provided between the first inductor and the first voltage output terminal.

7. The step-down control circuit according to claim 1, characterized in that: The second step-down module includes a second voltage input terminal, a fourth MOS tube, a fifth MOS tube, a second energy storage element and a second voltage output terminal. The gates of the fourth MOS tube and the fifth MOS tube are both connected to the step-down controller, the drain of the fourth MOS tube is connected to the second voltage input terminal, the source of the fourth MOS tube is respectively connected to the drain of the fifth MOS tube and one end of the second energy storage element, the other end of the second energy storage element is connected to the second voltage output terminal, and the source of the fifth MOS tube is grounded.

8. The step-down control circuit according to claim 7, characterized in that: The second energy storage element is a second inductor, and a second filtering subcircuit is provided between the second inductor and the second voltage output terminal.

9. The step-down control circuit according to claim 1, characterized in that: The output module includes a third voltage input terminal, a sixth MOS tube, a seventh MOS tube, a switch tube and a third voltage output terminal, the gate of the sixth MOS tube is connected to the external MCU, the drain of the sixth MOS tube is connected to the gate of the seventh MOS tube, the drain of the seventh MOS tube is connected to the gate of the switch tube, the source of the switch tube is connected to the third voltage input terminal, and the drain of the switch tube is connected to the third voltage output terminal.

10. A circuit board, characterized in that: The circuit board includes the step-down control circuit as described in any one of claims 1-9.

11. A network attached storage device, characterized in that: It includes the circuit board as claimed in claim 10, or includes the step-down control circuit as claimed in any one of claims 1-9.

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