A power supply selection and matching circuit, a power supply circuit and a power supply method

Abstract

The present application discloses a power supply selection circuit, a power supply circuit and a power supply method, relating to the technical field of computer circuits. The first protection circuit of the power supply selection circuit is connected to the selection control module to form a first power supply branch, and the first protection circuit is also connected to the selection control module and the voltage division network to form a signal branch; the selection control module is used to obtain a control signal, generate an enable signal corresponding to the control signal, and control the conduction or cutoff of the first power supply branch; the voltage division network is used to generate an enable signal adapted to the first protection circuit according to the control signal; the first protection circuit is used to output the power supply voltage obtained by its power supply input port to the selection control module when the enable signal enables the first protection circuit. The power supply selection circuit described in the present application can switch the power supply path according to the change of the load; for the change of the memory load power, without adding an extra interface, switch the power supply with the corresponding power to supply power to the load.

Description

Technical Field

[0001] This application relates to the technical field of computer circuits, and particularly to a power supply selection circuit, a power supply circuit, and a power supply method. Background Art

[0002] With the popularization of cloud technology, the processing requirements for daily massive data have continuously increased the requirements for the computing speed and storage capacity performance of servers. Servers must be equipped with larger-capacity memories to meet the requirements for data processing efficiency and capabilities. Generally, an expandable memory pool is used to meet the hardware requirements for data processing. Through the PCIe bus, a 75W power supply can be provided to the memory pooling device. When the memory power consumption approaches or exceeds 75W, an additional independent power supply interface is required to meet the memory power supply requirements. However, the additional power supply interface will occupy circuit board space, posing an obstacle to the miniaturization of the device. Summary of the Invention

[0003] In order to solve the problem that when the number of computer memory modules increases, additional power supply interfaces will be added, occupying more circuit board space, this application provides the following technical solutions:

[0004] In a first aspect, a power supply selection circuit is provided, including: a selection control module, a voltage division network, and a first protection circuit;

[0005] The first protection circuit is connected to the selection control module to form a first power supply branch, and the first protection circuit is also connected to the selection control module and the voltage division network to form a signal branch;

[0006] The selection control module is configured to obtain a control signal, generate an enable signal corresponding to the control signal in cooperation with the voltage division network, and transmit the enable signal to the first protection circuit through the signal branch to turn on or off the first power supply branch according to the level state of the control signal;

[0007] The voltage division network is configured to generate an enable signal adapted to the first protection circuit according to the control signal;

[0008] The first protection circuit is configured to output the power supply voltage obtained from its power supply input port to the selection control module when the enable signal enables the first protection circuit.

[0009] Further, the selection control module has: a control signal input port, a selection control pull-up port, a control signal output port, a selection control voltage input port, and a selection control voltage output port;

[0010] The voltage division network has: a network voltage input port and an enable signal port;

[0011] The first protection circuit also has: an enable input port and a voltage output port;

[0012] The control signal input port is used to receive a control signal. The selected control pull-up port is used to obtain the operating voltage for processing the control signal. The selected control voltage output port is used to provide voltage to a load. The network voltage input port is used to obtain the operating voltage for the voltage division network. The control signal output port is connected to the enable signal port and the enable input port. The selected control voltage input port is connected to the voltage output port.

[0013] Furthermore, the selection control module includes: a first control unit and a second control unit;

[0014] The first control unit is used to determine an enable signal according to the control signal;

[0015] The second control unit is used to output the voltage transmitted from the voltage output port of the first protection circuit after the first protection circuit is enabled.

[0016] Furthermore, the first control unit has: a first control port, a second control port, and a third control port;

[0017] The second control unit has: a fourth control port, a fifth control port, and a sixth control port;

[0018] After the first control port and the fourth control port are connected, they serve as the control signal input port. The second control port serves as the selected control pull-up port. The third control port serves as the control signal output port. The fifth control port serves as the selected control voltage input port. The sixth control port serves as the selected control voltage output port.

[0019] Furthermore, the first control unit includes a first switching device and a second switching device;

[0020] The first switching device has: a first switch first pole, a first switch second pole, and a first switch third pole;

[0021] The second switching device has: a second switch first pole, a second switch second pole, and a second switch third pole;

[0022] The first switch first pole serves as the first control port. After the first switch second pole and the second switch first pole are connected, they serve as the second control port. The second switch second pole serves as the third control port.

[0023] Furthermore, both the first switching device and the second switching device are N-channel metal-oxide-semiconductor field effect transistors.

[0024] Furthermore, the second control unit includes: a third switching device and a fourth switching device;

[0025] The third switching device has: a third switch first pole, a third switch second pole, and a third switch third pole;

[0026] The fourth switching device has: a fourth switching first pole, a fourth switching second pole, and a fourth switching third pole;

[0027] The third switching first pole serves as the fourth control port, the third switching second pole is connected to the fourth switching first pole, the fourth switching second pole serves as the fifth control port, and the fourth switching third pole serves as the sixth control port.

[0028] Furthermore, the second control unit further includes a first resistor;

[0029] The first resistor is connected in parallel between the fourth switching first pole and the fourth switching third pole.

[0030] Furthermore, the third switching device is an N-channel metal-oxide-semiconductor field-effect transistor, and the fourth switching device is a P-channel metal-oxide-semiconductor field-effect transistor.

[0031] Furthermore, the voltage dividing network includes a second resistor and a third resistor;

[0032] One end of the second resistor serves as the network voltage input port of the voltage dividing network, and the other end of the second resistor is connected to one end of the third resistor and serves as the enable signal port of the voltage dividing network.

[0033] Furthermore, the power supply selection circuit further includes a diode;

[0034] The anode of the diode is connected to the select control voltage input port, and the cathode of the diode is connected to the select control voltage output port.

[0035] Furthermore, the power supply selection circuit further includes: a fourth resistor;

[0036] The fourth resistor is connected in series between the control signal output port and the enable signal port.

[0037] In a second aspect, a power supply circuit is provided. The power supply circuit includes the power supply selection circuit described in the first aspect, a first power supply unit, a second power supply unit, a second protection circuit, a fifth resistor, and a sixth resistor;

[0038] The first power supply unit has: a first voltage output port;

[0039] The second power supply unit has: a second voltage output port, a load signal output port, and a load status receiving port;

[0040] The first voltage output port is connected to the power input port to supply power to the first protection circuit. The second voltage output port is connected to the select control voltage output port to form a second power supply branch. The load signal output port is connected to the control signal input port to generate a control signal according to the load status signal and transmit the control signal to the selection control module. The load status receiving port is used to obtain the load status signal;

[0041] The second protection circuit is connected in series between the selected control voltage output port and the load. One end of the fifth resistor is connected to the load status receiving port, and one end of the sixth resistor is connected to the selected control pull-up port.

[0042] In a third aspect, a circuit board is provided, including the power supply selection circuit described in the first aspect or the power supply circuit described in the second aspect.

[0043] In a fourth aspect, a power supply method is provided, which is applied to the power supply circuit described in the second aspect, and includes:

[0044] Connect the first voltage output port to the power input port, connect the second voltage output port to the selected control voltage input port, and connect the load signal output port to the control signal input port;

[0045] In response to the load power being less than the preset power, obtain a control signal with a first level state to generate an enable signal for enabling the first protection circuit, and disconnect the second power supply branch;

[0046] According to the enable signal, enable the first protection circuit to conduct the first power supply branch, and supply power to the load by the first power supply unit.

[0047] Further, the power supply method further includes:

[0048] In response to the load power being greater than or equal to the preset power, obtain a control signal with a second level state to enable the second power supply unit, and generate an enable signal for turning off the first protection circuit to disconnect the first power supply branch, and supply power to the load by the second power supply unit.

[0049] The beneficial effects brought by the technical solutions provided in the embodiments of the present application are as follows: By implementing the power supply selection circuit, power supply circuit, circuit board, and power supply method described in the embodiments of the present application, it is possible to switch the power supply path according to the change of the load; in response to the change of the memory load power, without adding additional interfaces, switch the power supply with the corresponding power to supply power to the load. Description of the Drawings

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0051] Figure 1 It is a schematic diagram of a power supply selection circuit module provided by an embodiment of the present application;

[0052] Figure 2 It is a schematic diagram of a selection control module provided by an embodiment of the present application;

[0053] Figure 3 It is a schematic diagram of a control unit circuit provided by an embodiment of the present application;

[0054] Figure 4 It is a schematic diagram of a voltage division network circuit provided by an embodiment of the present application;

[0055] Figure 5 It is a schematic diagram of another power supply selection and matching circuit provided by an embodiment of the present application;

[0056] Figure 6 It is a schematic diagram of a power supply circuit provided by an embodiment of the present application;

[0057] Figure 7 It is a schematic diagram of a power supply method provided by an embodiment of the present application. Detailed implementation manners

[0058] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only a part rather than all of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

[0059] Unless otherwise defined, the technical terms or scientific terms used in this disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which this disclosure belongs. The "first", "second" and similar terms used in this disclosure do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a", "an" or "the" do not denote a quantity limitation, but mean that there is at least one. The numbers in the accompanying drawings of the specification only represent the distinction of each functional component or module, and do not represent the logical relationship between the components or modules. The terms such as "including" or "comprising" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left" and "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0060] Next, various embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. It should be noted that in the drawings, the same reference numerals are assigned to components having substantially the same or similar structures and functions, and repeated descriptions thereof will be omitted.

[0061] Regarding the problem that an increase in the number of computer memory modules will additionally increase the power supply interface and occupy more circuit board space, the present application provides the following embodiments:

[0062] In some embodiments, as Figure 1 shown, a power supply selection circuit includes: a selection control module 100, a voltage division network 200, and a first protection circuit 300.

[0063] The first protection circuit 300 is connected to the selection control module 100 to form a first power supply branch, and the first protection circuit 300 is also connected to the selection control module 100 and the voltage division network 200 to form a signal branch.

[0064] The selection control module 100 is configured to obtain a control signal, cooperate with the voltage division network 200 to generate an enable signal corresponding to the control signal, and transmit the enable signal to the first protection circuit 300 through the signal branch, so as to turn on or off the first power supply branch according to the level state of the control signal.

[0065] Optionally, as the device of the first protection circuit 300, an electronic device that can be controlled to be turned on or off by a control signal can be selected, for example: an electronic fuse. Schematically, a device with the model number: MP5325C produced by Monolithic Power Systems, Inc. can be selected as the first protection circuit 300. The device with the model number MP5325C is an electronic device that can protect the hot-swap circuit and can protect the output voltage from transient fluctuations of the input voltage.

[0066] The voltage division network 200 is configured to generate an enable signal whose voltage amplitude is adapted to the first protection circuit 300 according to the control signal.

[0067] Since the form of the enable signal is a logic level, and the logic level includes a low level and a high level. Through the action of the voltage division network 200, the control signal can be converted into a logic level whose voltage amplitude is adapted to the first protection circuit 300. Schematically, the voltage amplitude range of the enable signal adapted to the device with the model number MP5325C is: a voltage signal with a voltage amplitude in the range of 0V to 0.9V is used as a low-level signal; a voltage signal with a voltage amplitude above 2.9V is used as a high-level signal. Through the action of the voltage division network 200, the control signal can be converted into a low-level signal with a voltage amplitude between 0V and 0.9V, or a high-level signal with a voltage amplitude above 2.9V.

[0068] The first protection circuit 300 is configured to output the power supply voltage obtained by its power input port 300a to the selection control module 100 when the enable signal enables the first protection circuit 300.

[0069] The power input port 300a of the first protection circuit 300 is used to obtain the power supply voltage. The first protection circuit 300 is connected in series between the power supply voltage and the selection control module 100, and its conduction or cutoff is controlled by the enable signal to control whether to supply the power supply voltage to the selection control module 100.

[0070] As Figure 2 shown, the selection control module 100 has: a control signal input port 100a, a selection control pull-up port 100b, a control signal output port 100c, a selection control voltage input port 100d, and a selection control voltage output port 100e.

[0071] The voltage dividing network 200 has: a network voltage input port 200a and an enable signal port 200b.

[0072] The first protection circuit 300 also has: an enable input port 300b and a voltage output port 300c.

[0073] Schematically, taking the device of model MP5325C as an example of the first protection circuit 300, the pins numbered 21 and / or 22 thereof serve as the power input port 300a, one or more of the pins numbered 13, 14, 15, 16, 17, 18, 19, and 20 thereof serve as the voltage output port 300c, and the pin numbered 2 thereof serves as the enable input port 300b.

[0074] The control signal input port 100a is used to receive the control signal.

[0075] The selection control pull-up port 100b is used to obtain the operating voltage for processing the control signal. This operating voltage can be provided by an independent power supply or by a power management module. Schematically, the amplitude of this operating voltage is 3.3V.

[0076] The selection control voltage output port 100e is used to supply voltage to the load.

[0077] The network voltage input port 200a is used to obtain the operating voltage for the voltage dividing network to operate. This operating voltage can be provided by an independent power supply or by a power management module. Schematically, the amplitude of this operating voltage is 12V.

[0078] The control signal output port 100c is connected to the enable signal port 200b and the enable input port 300b, and is used to output the enable signal corresponding to the control signal.

[0079] The selected control voltage input port 100d is connected to the voltage output port 300c for obtaining the power supply voltage of the power input port 300a in the first power supply branch, and the enable input port 300b is used for obtaining an enable signal.

[0080] Specifically, the selection control module 100 includes: a first control unit 110 and a second control unit 120;

[0081] The first control unit 110 is configured to determine an enable signal according to a control signal.

[0082] The second control unit 120 is configured to output the voltage transmitted by the voltage output port 300c of the first protection circuit 300 after the first protection circuit 300 is enabled.

[0083] The first control unit 110 has: a first control port 110a, a second control port 110b, and a third control port 110c.

[0084] The second control unit 120 has: a fourth control port 120a, a fifth control port 120b, and a sixth control port 120c.

[0085] After the first control port 110a is connected to the fourth control port 120a, it serves as the control signal input port 100a, the second control port 110b serves as the selected control pull-up port 100b, the third control port 110c serves as the control signal output port 100c, the fifth control port 120b serves as the selected control voltage input port 100d, and the sixth control port 120c serves as the selected control voltage output port 100e.

[0086] As Figure 3 shown, the first control unit 110 includes: a first switching device T1 and a second switching device T2.

[0087] The first switching device T1 has: a first switch first pole T 11 , a first switch second pole T 12 , and a first switch third pole T 13 .

[0088] The second switching device T2 has: a second switch first pole T 21 , a second switch second pole T 22 , and a second switch third pole T 23 .

[0089] The first switch first pole T 11 serves as the first control port 110a, and the first switch second pole T 12 is connected to the second switch first pole T 21 and then serves as the second control port 110b, and the second switch second pole T 22As the third control port 110c, the third pole T of the first switch 13 and the third pole T of the second switch 23 are connected to the reference potential.

[0090] Preferably, the reference potential is the ground potential.

[0091] Preferably, both the first switching device T1 and the second switching device T2 are N-channel metal-oxide-semiconductor field effect transistors.

[0092] Taking the case where both the first switching device T1 and the second switching device T2 are N-channel metal-oxide-semiconductor field effect transistors as an example, the first pole T of the first switch 11 is the gate, the second pole T of the first switch 12 is the drain, and the third pole T of the first switch 13 is the source; the first pole T of the second switch 21 is the gate, the second pole T of the second switch 22 is the drain, and the third pole T of the second switch 23 is the source.

[0093] When the first pole T of the first switch 11 receives a high-level signal, the first switching device T1 conducts, and the potential of the first pole T of the second switch 21 is pulled down to the ground. Therefore, the second switching device T2 is turned off, and the voltage output from the third control port 110c is the voltage of the second pole T of the second switch 22 .

[0094] When the first pole T of the first switch 11 receives a low-level signal,

[0095] The second control unit 120 includes: a third switching device T3 and a fourth switching device T4;

[0096] The third switching device T3 has: a first pole T of the third switch 31 , a second pole T of the third switch 32 and a third pole T of the third switch 33 ;

[0097] The fourth switching device T4 has: a first pole T of the fourth switch 41 , a second pole T of the fourth switch 42 and a third pole T of the fourth switch 43 ;

[0098] The first pole T of the third switch 31 is used as the fourth control port 120a, and the second pole T of the third switch 32 is connected to the first pole T of the fourth switch 41 , and the second pole T of the fourth switch 42As the fifth control port 120b, the third pole of the fourth switch T 43 As the sixth control port 120c, the third pole of the third switch T 33 is connected to the reference potential.

[0099] Preferably, the reference potential is the ground potential.

[0100] The second control unit 120 further includes a first resistor R1;

[0101] The first resistor R1 is connected in parallel between the first pole of the fourth switch T 41 and the third pole of the fourth switch T 43 therebetween.

[0102] Preferably, the third switching device T3 is an N-channel metal-oxide-semiconductor field effect transistor, and the fourth switching device T4 is a P-channel metal-oxide-semiconductor field effect transistor.

[0103] Taking the third switching device T3 as an N-channel metal-oxide-semiconductor field effect transistor and the fourth switching device T4 as a P-channel metal-oxide-semiconductor field effect transistor as an example, the first pole of the third switch T 31 is the gate, the second pole of the third switch T 32 is the drain, and the third pole of the third switch T 33 is the source; the first pole of the fourth switch T 41 is the gate, the second pole of the fourth switch T 42 is the source, and the third pole of the fourth switch T 43 is the drain.

[0104] As Figure 4 shown, the voltage dividing network 200 includes a second resistor R2 and a third resistor R3.

[0105] One end of the second resistor R2 serves as the network voltage input port 200a of the voltage dividing network 200, the other end of the second resistor R2 is connected to one end of the third resistor R3 and serves as the enable signal port 200b of the voltage dividing network 200, and the other end of the third resistor R3 is connected to the reference potential. Preferably, the reference potential is the ground potential.

[0106] As Figure 5 shown, the power supply selection circuit further includes a diode D;

[0107] The anode of the diode D is connected to the selection control voltage input port 100d, and the cathode of the diode D is connected to the selection control voltage output port 100e.

[0108] According to the diode connection method described above, the anode of the diode D is connected to the second pole of the fourth switch T 42 and the cathode of the diode D is connected to the third pole of the fourth switch T 43Connection. Since the fourth switch is a P-channel metal-oxide-semiconductor field-effect transistor, its conduction condition is that the gate-source voltage is less than its conduction threshold voltage. After the diode D conducts, the third pole T of the fourth switch 43 Due to the clamping effect of the diode, its potential is approximately equal to the potential of the voltage output port 300c. In some embodiments, the potential of the voltage output port 300c is set to 12V, and the low-level amplitude for controlling the conduction of the fourth switching device T4 is approximately 0V. By setting the diode D, the gate-source voltage of the fourth switching device T4 can be made less than its conduction threshold voltage, enabling the fourth switching device T4 to turn on rapidly.

[0109] The power supply selection circuit further includes: a fourth resistor R4.

[0110] The fourth resistor R4 is connected in series between the control signal output port 100c and the enable signal port 200b. It functions as a current limiter.

[0111] In some other embodiments, a power supply circuit, as Figure 6 shown, includes the power supply selection circuit described above, a first power supply unit 400, a second power supply unit 500, a second protection circuit 600, a fifth resistor R5, and a sixth resistor R6.

[0112] The second protection circuit 600 is connected to the load 900. The load 900 has two operating states: a light load 910 or a heavy load 920.

[0113] The first power supply unit 400 has: a first voltage output port 400a for providing a first power supply voltage.

[0114] The second power supply unit 500 has: a second voltage output port 500a, a load signal output port 500b, and a load status receiving port 500c.

[0115] The second voltage output port 500a is for providing a second power supply voltage.

[0116] The load signal output port 500b is connected to the control signal input port 100a, and is used to generate a control signal according to the load status signal and transmit the control signal to the selection control module 100.

[0117] The load status receiving port 500c is for obtaining the load status signal.

[0118] The first power supply voltage and the second power supply voltage can be voltages with the same voltage amplitude, or voltages with different voltage amplitudes. In the embodiments described in this application, preferably, the amplitudes of the first power supply voltage and the second power supply voltage are the same.

[0119] The load status signal is used to indicate the load status of the access power supply circuit. The load status includes: light load or heavy load. Taking the memory power supply circuit as an example, the number of memory modules accessed to the power supply circuit can be used as the basis for distinguishing between light and heavy loads. For example: when two or fewer memory modules are accessed, it is a light load; when three or more memory modules are accessed, it is a heavy load.

[0120] The control signal is generated according to the load status signal and corresponds to the light load or heavy load status; it controls the power supply selection circuit to select the corresponding power supply unit according to the load status.

[0121] The first voltage output port 400a is connected to the power input port 300a to supply voltage to the first protection circuit 300, providing electrical energy with the output voltage of the first power supply unit 400 and the first power. The first voltage output port 400a is also connected to the network voltage input port 200a to supply the working voltage to the voltage dividing network 200.

[0122] The second voltage output port 500a is connected to the selection control voltage output port 100e to form a second power supply branch, providing electrical energy with the output voltage of the second power supply unit 500 and the second power to the load.

[0123] Generally, the second power is greater than the first power. The first power supply unit 400 supplies power to the load when the power supply circuit is lightly loaded; the second power supply unit 500 supplies power to the load when the power supply circuit is heavily loaded.

[0124] A fifth switching device T5 is provided in the second power supply unit 500. Preferably, the fifth switching device T5 is an N-channel metal-oxide-semiconductor field effect transistor. The gate of the fifth switching device serves as the load status receiving port 500c, its drain serves as the load signal output port 500b, and its source is grounded.

[0125] After the load status signal received at the load status receiving port 500c is a low load signal, the power supply of the second power supply branch is turned off. At the same time, the fifth switching device T5 is turned off. The potential of the load signal output port 500b is pulled high, and a high level is output to the control signal input port 100a as the control signal. Under the action of the control signal, the first power supply branch supplies power to the load, and the first power supply unit 400 supplies electrical energy with the output voltage of the first power supply unit 400 and the first power to the load.

[0126] After the load status signal received at the load status receiving port 500c is a high load signal, the power supply of the second power supply branch to the load is enabled. At the same time, the fifth switching device T5 is turned on. The potential of the load signal output port 500b is pulled down, and a low level is output to the control signal input port 100a as a control signal. Under the action of the control signal, the first power supply branch is turned off. Therefore, only the second power supply unit 500 supplies electrical energy with a voltage of the output voltage of the second power supply unit 500 and a power of the second power to the load.

[0127] The second protection circuit 600 is connected in series between the selected control voltage output port 100e and the load. Optionally, the second protection circuit 600 is a fuse.

[0128] One end of the fifth resistor R5 is connected to the load status receiving port, and the other end of the fifth resistor R5 is connected to the operating voltage for providing a logic level.

[0129] One end of the sixth resistor R6 is connected to the selected control pull-up port, and the other end of the sixth resistor R6 is connected to the operating voltage for providing a logic level.

[0130] Optionally, the other end of the fifth resistor R5 is connected to the other end of the sixth resistor R6 and is powered by the same operating voltage.

[0131] Preferably, the operating voltage is provided by the first power supply unit 400, and the amplitude of the operating voltage is 3.3V.

[0132] The power supply selection and matching circuit includes: a selection control module, a voltage dividing network, and a first protection circuit;

[0133] The first protection circuit is connected to the selection control module to form a first power supply branch. The first protection circuit is also connected to the selection control module and the voltage dividing network to form a signal branch;

[0134] The selection control module is configured to obtain a control signal, generate an enable signal corresponding to the control signal in cooperation with the voltage dividing network, and transmit the enable signal to the first protection circuit through the signal branch to turn on or off the first power supply branch according to the level state of the control signal;

[0135] The voltage dividing network is configured to generate an enable signal adapted to the first protection circuit according to the control signal;

[0136] The first protection circuit is configured to output the power supply voltage obtained at its power supply input port to the selection control module when the enable signal enables the first protection circuit.

[0137] Specifically, the selection control module has: a control signal input port, a selected control pull-up port, a control signal output port, a selected control voltage input port, and a selected control voltage output port;

[0138] The voltage dividing network has: a network voltage input port and an enable signal port;

[0139] The first protection circuit also has: an enable input port and a voltage output port;

[0140] The control signal input port is used to receive a control signal, the select control pull-up port is used to obtain the operating voltage for processing the control signal, the select control voltage output port is used to provide voltage to the load, the network voltage input port is used to obtain the operating voltage for the voltage dividing network to work, the control signal output port is connected to the enable signal port and the enable input port, and the select control voltage input port is connected to the voltage output port.

[0141] Specifically, the selection control module includes: a first control unit and a second control unit;

[0142] The first control unit is used to determine the enable signal according to the control signal;

[0143] The second control unit is used to output the voltage transmitted from the voltage output port of the first protection circuit after the first protection circuit is enabled.

[0144] Specifically, the first control unit has: a first control port, a second control port, and a third control port;

[0145] The second control unit has: a fourth control port, a fifth control port, and a sixth control port;

[0146] After the first control port is connected to the fourth control port, it serves as the control signal input port, the second control port serves as the select control pull-up port, the third control port serves as the control signal output port, the fifth control port serves as the select control voltage input port, and the sixth control port serves as the select control voltage output port.

[0147] Specifically, the first control unit includes a first switching device and a second switching device;

[0148] The first switching device has: a first switch first pole, a first switch second pole, and a first switch third pole;

[0149] The second switching device has: a second switch first pole, a second switch second pole, and a second switch third pole;

[0150] The first switch first pole serves as the first control port, the first switch second pole is connected to the second switch first pole and then serves as the second control port, and the second switch second pole serves as the third control port.

[0151] Preferably, both the first switching device and the second switching device are N-channel metal-oxide-semiconductor field effect transistors.

[0152] Specifically, the second control unit includes: a third switching device and a fourth switching device;

[0153] The third switching device has: a first pole of the third switch, a second pole of the third switch, and a third pole of the third switch;

[0154] The fourth switching device has: a first pole of the fourth switch, a second pole of the fourth switch, and a third pole of the fourth switch;

[0155] The first pole of the third switch serves as the fourth control port, the second pole of the third switch is connected to the first pole of the fourth switch, the second pole of the fourth switch serves as the fifth control port, and the third pole of the fourth switch serves as the sixth control port.

[0156] Preferably, the second control unit further includes a first resistor;

[0157] The first resistor is connected in parallel between the first pole of the fourth switch and the third pole of the fourth switch.

[0158] Preferably, the third switching device is an N-channel metal-oxide-semiconductor field-effect transistor, and the fourth switching device is a P-channel metal-oxide-semiconductor field-effect transistor.

[0159] Specifically, the voltage dividing network includes a second resistor and a third resistor;

[0160] One end of the second resistor serves as the network voltage input port of the voltage dividing network, and the other end of the second resistor is connected to one end of the third resistor and serves as the enable signal port of the voltage dividing network.

[0161] Preferably, the power supply selection and matching circuit further includes a diode;

[0162] The anode of the diode is connected to the select control voltage input port, and the cathode of the diode is connected to the select control voltage output port.

[0163] Preferably, the power supply selection and matching circuit further includes: a fourth resistor;

[0164] The fourth resistor is connected in series between the control signal output port and the enable signal port.

[0165] The power supply circuit principle is described separately for the two cases of light load and heavy load of the load. Taking the memory power supply circuit as an example, the load is a Dual-Inline-Memory-Module (DIMM), and the first protection circuit 300 selects a device of model MP5325C. When the load is 1 or 2 dual in-line memory modules, the load is a light load; when the load is 3 or more dual in-line memory modules (usually 3 or 4), the load is a heavy load. The first power supply unit provides a power supply of 12V and 75W; the second power supply unit provides a power supply of 12V and 150W.

[0166] When the load is a light load, a low-load signal is used as the load status signal and transmitted to the load status receiving port 500c. After the load status receiving port 500c receives the low-load signal as the load status signal, the power supply of the second power supply branch is turned off. At the same time, the fifth switching device T5 is turned off. The potential of the load signal output port 500b is pulled up, and a high level is output to the control signal input port 100a as the control signal. Under the action of the high-level control signal, the first switching device T1 is turned on, the second switching device T2 is turned off, the third switching device T3 is turned on, and the fourth switching device T4 is turned on. After being divided by the voltage dividing network 200, a high level is transmitted to the enable input port 300b. The first protection circuit 300 is enabled after receiving the high level, and the first power supply branch is turned on. The output voltage of the first power supply unit 400 is input through the selected control voltage input port 100d and output from the selected control voltage output port 100e. 12V and 75W of power supply are provided to the load through the second protection circuit 600. It should be noted that the function of the diode D is to increase the conduction speed of the fourth switching device T4 when it is not conducting, so as to quickly turn on the first power supply branch; after it conducts, it prevents current backflow.

[0167] When the load is a heavy load, a high-load signal is used as the load status signal and transmitted to the load status receiving port 500c. After the load status receiving port 500c receives the high-load signal as the seat load status signal, the power supply of the second power supply branch is enabled. At the same time, the fifth switching device T5 is turned off and then turned on. The potential of the load signal output port 500b is pulled down, and a low level is output to the control signal input port 100a as the control signal. Under the action of the low-level control signal, the first switching device T1 is turned off, the second switching device T2 is turned on, the third switching device T3 is turned off, and the fourth switching device T4 is turned off. After being divided by the voltage dividing network 200, a low level is transmitted to the enable input port 300b. The first protection circuit 300 is turned off after receiving the low level, and the first power supply branch is disconnected. At this time, only the second power supply unit 500 provides 12V and 75W of power supply to the load through the second protection circuit 600.

[0168] Preferably, the port for transmitting power to the load is a gold finger. Whether the first power supply unit 400 supplies power to the load or the second power supply unit 500 supplies power to the load, the power supply port of the gold finger is multiplexed. And the two power supply branches do not supply power to the load simultaneously, avoiding the current sharing problem when two power supplies supply power at the same time.

[0169] In some other embodiments, a circuit board includes the power supply selection and matching circuit described in the first aspect or the power supply circuit described in the second aspect.

[0170] In some other embodiments, such as Figure 7As shown, a power supply method is applied to the power supply selection circuit described in the first aspect or the power supply circuit described in the second aspect, and includes:

[0171] S100: Connect the first voltage output port to the power input port, connect the second voltage output port to the selection control voltage input port, and connect the load signal output port to the control signal input port;

[0172] S200: In response to the load power being less than the preset power, obtain a control signal with a first level state to generate an enable signal for enabling the first protection circuit, and disconnect the second power supply branch;

[0173] S300: According to the enable signal, enable the first protection circuit to conduct the first power supply branch, and supply power to the load by the first power supply unit.

[0174] Optionally, the power supply method further includes:

[0175] S200': In response to the load power being greater than or equal to the preset power, obtain a control signal with a second level state to enable the second power supply unit, and generate an enable signal for turning off the first protection circuit to disconnect the first power supply branch, and supply power to the load by the second power supply unit.

[0176] By implementing the power supply selection circuit described in the embodiments of the present application, the conduction or disconnection of the first power supply branch can be switched according to the change of the load. The diode can quickly turn on the fourth switching device to quickly conduct the first power supply branch, and prevent current conduction after the fourth switching device is conducted; the power supply circuit can switch the power supply path according to the change of the load; for the change of the memory load power, without adding an extra interface, switch the power supply with the corresponding power to supply power to the load, and there is no need to consider the current sharing problem; implementing the power supply method can quickly adjust the adapted power supply unit to supply power to the load according to the change of the load state.

[0177] All the above optional technical solutions can be combined arbitrarily to form optional embodiments of the present application, which will not be elaborated here one by one.

[0178] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power supply selection circuit, characterized in that, Comprising: A selection control module, a voltage dividing network, and a first protection circuit; The first protection circuit is connected to the selection control module to form a first power supply branch, and the first protection circuit is also connected to the selection control module and the voltage dividing network to form a signal branch; The selection control module is configured to obtain a control signal, generate an enable signal corresponding to the control signal in cooperation with the voltage dividing network, and transmit the enable signal to the first protection circuit through the signal branch to turn on or off the first power supply branch according to the level state of the control signal; The voltage dividing network is configured to generate an enable signal adapted to the first protection circuit according to the control signal; The first protection circuit is configured to output the power supply voltage obtained from its power supply input port to the selection control module when the enable signal enables the first protection circuit; Wherein, the selection control module has: a control signal input port, a selection control pull-up port, a control signal output port, a selection control voltage input port, and a selection control voltage output port; The voltage dividing network has: a network voltage input port and an enable signal port; The first protection circuit also has: an enable input port and a voltage output port; The control signal input port is used to receive a control signal, the selection control pull-up port is used to obtain the working voltage for processing the control signal, the selection control voltage output port is used to provide voltage to a load, the network voltage input port is used to obtain the working voltage for the voltage dividing network to work, the control signal output port is connected to the enable signal port and the enable input port, and the selection control voltage input port is connected to the voltage output port.

2. The power supply selection and matching circuit according to claim 1, characterized in that The selection control module includes: a first control unit and a second control unit; The first control unit is configured to determine the enable signal according to the control signal; The second control unit is configured to output the voltage transmitted from the voltage output port of the first protection circuit after the first protection circuit is enabled.

3. The power supply selection and matching circuit according to claim 2, wherein The first control unit has: a first control port, a second control port, and a third control port; The second control unit has: a fourth control port, a fifth control port, and a sixth control port; The first control port and the fourth control port are connected and used as the control signal input port, the second control port is used as the selection control pull-up port, the third control port is used as the control signal output port, the fifth control port is used as the selection control voltage input port, and the sixth control port is used as the selection control voltage output port.

4. The power supply selection and matching circuit according to claim 3, characterized in that, The first control unit includes a first switching device and a second switching device; The first switching device has: a first switch first pole, a first switch second pole, and a first switch third pole; The second switching device has: a second switch first pole, a second switch second pole, and a second switch third pole; The first switch first pole is used as the first control port, the first switch second pole and the second switch first pole are connected and used as the second control port, and the second switch second pole is used as the third control port.

5. The power supply selection and matching circuit according to claim 4, characterized in that Both the first switching device and the second switching device are N-channel metal-oxide-semiconductor field effect transistors.

6. The power supply selection and matching circuit according to claim 3, wherein The second control unit includes: a third switching device and a fourth switching device; The third switching device has: a first pole of the third switch, a second pole of the third switch, and a third pole of the third switch; The fourth switching device has: a first pole of the fourth switch, a second pole of the fourth switch, and a third pole of the fourth switch; The first pole of the third switch serves as the fourth control port, the second pole of the third switch is connected to the first pole of the fourth switch, the second pole of the fourth switch serves as the fifth control port, and the third pole of the fourth switch serves as the sixth control port.

7. The power supply selection and matching circuit according to claim 6, characterized in that, The second control unit further includes a first resistor; The first resistor is connected in parallel between the first pole of the fourth switch and the third pole of the fourth switch.

8. The power supply selection and matching circuit according to claim 6, characterized in that The third switching device is an N-channel metal-oxide-semiconductor field effect transistor, and the fourth switching device is a P-channel metal-oxide-semiconductor field effect transistor.

9. The power supply selection and matching circuit according to claim 1, characterized in that, The voltage dividing network includes a second resistor and a third resistor; One end of the second resistor serves as the network voltage input port of the voltage dividing network, and the other end of the second resistor is connected to one end of the third resistor and serves as the enable signal port of the voltage dividing network.

10. The power supply selection and matching circuit according to claim 1, characterized in that The power supply selection circuit further includes a diode; The anode of the diode is connected to the selection control voltage input port, and the cathode of the diode is connected to the selection control voltage output port.

11. The power supply selection and matching circuit according to claim 1, wherein The power supply selection circuit further includes: a fourth resistor; The fourth resistor is connected in series between the control signal output port and the enable signal port.

12. A power supply circuit, characterized in that, The power supply circuit includes the power supply selection circuit according to any one of claims 1-11, a first power supply unit, a second power supply unit, a second protection circuit, a fifth resistor, and a sixth resistor; The first power supply unit has: a first voltage output port; The second power supply unit has: a second voltage output port, a load signal output port, and a load status receiving port; The first voltage output port is connected to the power supply input port to supply power to the first protection circuit, the second voltage output port is connected to the selection control voltage output port to form a second power supply branch, the load signal output port is connected to the control signal input port to generate a control signal according to the load status signal and transmit the control signal to the selection control module, and the load status receiving port is used to obtain the load status signal; The second protection circuit is connected in series between the selection control voltage output port and the load, one end of the fifth resistor is connected to the load status receiving port, and one end of the sixth resistor is connected to the selection control pull-up port.

13. A power supply method, characterized in that, Applied to the power supply circuit according to claim 12, including: Connect the first voltage output port to the power supply input port, connect the second voltage output port to the selection control voltage input port, and connect the load signal output port to the control signal input port; In response to the load power being less than the preset power, obtain a control signal with a first level status to generate an enable signal for enabling the first protection circuit and disconnect the second power supply branch; According to the enabling signal, enable the first protection circuit to turn on the first power supply branch, and supply power to the load by the first power supply unit.

14. The power supply method according to claim 13, wherein The method further includes: In response to the load power being greater than or equal to the preset power, obtain a control signal with a second level state to enable the second power supply unit, and generate an enabling signal for turning off the first protection circuit to disconnect the first power supply branch, and supply power to the load by the second power supply unit.

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