Power supply selecting and matching circuit, power supply circuit and power supply method

Abstract

The invention discloses a power supply matching circuit, a power supply circuit and a power supply method, and relates to the technical field of computer circuits. A first protection circuit of the power supply selection and distribution circuit is connected with a selection control module to form a first power supply branch, and the first protection circuit is further connected with the selection control module and a potential-divider network to form a signal branch. The selection control module is used for acquiring a control signal, generating an enable signal corresponding to the control signal and controlling the connection or disconnection of the first power supply branch; the voltage division network is used for generating an enable signal adaptive to the first protection circuit according to the control signal; and the first protection circuit is used for outputting the power supply voltage obtained by the power supply input port to the selection control module when the enable signal enables the first protection circuit. According to the power supply selection and distribution circuit, power supply paths can be switched according to the change of the load; for the change of the power of the memory load, no additional interface is added, and the power supply with the corresponding power is switched to supply power to the load.

Description

Technical Field

[0001] The present application relates to the technical field of computer circuits, and in particular 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 demand for processing massive amounts of daily data has increased the requirements for server computing speed and storage capacity performance. Servers must be equipped with larger memory to meet the needs of data processing efficiency and capabilities. Usually, an expandable memory pool is used to meet the hardware requirements for data processing. Through the PCIe bus, 75W of power can be supplied 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 take up circuit board space, which will hinder the miniaturization of the device. Summary of the invention

[0003] In order to solve the problem that the increase in the number of computer memory sticks will result in additional power supply interfaces and occupy more circuit board space, the present application provides the following technical solutions: In a first aspect, a power supply selection circuit is provided, 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; Select a control module, which is used to obtain a control signal, cooperate with a voltage divider network to generate an enable signal corresponding to the control signal, and transmit the enable signal to the first protection circuit through a signal branch, so as to turn on or off the first power supply branch according to the level state of the control signal; A voltage divider network, used for generating 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 from its power supply input port to the selection control module when the enable signal enables the first protection circuit.

[0004] 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; The voltage divider 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 the control signal, the optional pull-up port is used to obtain the working voltage for processing the control signal, the optional voltage output port is used to provide voltage to the load, the network voltage input port is used to obtain the working voltage for the voltage divider network, the control signal output port is connected to the enable signal port and the enable input port, and the optional voltage input port is connected to the voltage output port.

[0005] Further, the selection control module includes: a first control unit and a second control unit; A first control unit, configured to determine an enable signal according to a control signal; The second control unit is used to output the voltage transmitted by the voltage output port of the first protection circuit after the first protection circuit is enabled.

[0006] Further, 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; After the first control port is connected to the fourth control port, it serves as a control signal input port, the second control port serves as a selective pull-up port, the third control port serves as a control signal output port, the fifth control port serves as a selective voltage input port, and the sixth control port serves as a selective voltage output port.

[0007] Further, the first control unit includes a first switching device and a second switching device; The first switch device comprises: a first switch first pole, a first switch second pole and a first switch third pole; The second switch device comprises: a second switch first pole, a second switch second pole and a second switch third pole; The first pole of the first switch serves as the first control port, the second pole of the first switch is connected to the first pole of the second switch and serves as the second control port, and the second pole of the second switch serves as the third control port.

[0008] Furthermore, the first switch device and the second switch device are both N-channel metal-oxide-semiconductor field effect transistors.

[0009] Further, the second control unit includes: a third switch device and a fourth switch device; The third switch device comprises: a third switch first pole, a third switch second pole and a third switch third pole; The fourth switch device comprises: a fourth switch first electrode, a fourth switch second electrode and a fourth switch third electrode; 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.

[0010] Further, the second control unit also includes a first resistor; The first resistor is connected in parallel between the first electrode of the fourth switch and the third electrode of the fourth switch.

[0011] Further, the third switch device is an N-channel metal-oxide-semiconductor field effect transistor, and the fourth switch device is a P-channel metal-oxide-semiconductor field effect transistor.

[0012] Further, the voltage divider network includes a second resistor and a third resistor; One end of the second resistor serves as a network voltage input port of the voltage divider network, and the other end of the second resistor is connected to one end of the third resistor and serves as an enable signal port of the voltage divider network.

[0013] Furthermore, the power supply matching circuit also 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.

[0014] Furthermore, the power supply matching circuit further includes: a fourth resistor; The fourth resistor is connected in series between the control signal output port and the enable signal port.

[0015] In a second aspect, a power supply circuit is provided, the power supply circuit comprising the power supply matching 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; 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 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 state signal and transmit the control signal to the selection control module, and the load state receiving port is used to obtain the load state signal; The second protection circuit is connected in series between the selected voltage output port and the load, one end of the fifth resistor is connected to the load state receiving port, and one end of the sixth resistor is connected to the selected pull-up port.

[0016] In a third aspect, a circuit board is provided, comprising the power supply selection circuit recorded in the first aspect, or the power supply circuit recorded in the second aspect.

[0017] In a fourth aspect, a power supply method is provided, which is applied to the power supply circuit described in the second aspect, comprising: Connecting the first voltage output port to the power input port, connecting the second voltage output port to the selected control voltage input port, and connecting the load signal output port to the control signal input port; In response to the load power being less than the preset power, a control signal whose level state is a first level state is obtained to generate an enable signal for enabling the first protection circuit, and disconnect the second power supply branch; According to the enable signal, the first protection circuit is enabled to turn on the first power supply branch, and the first power supply unit supplies power to the load.

[0018] Furthermore, the power supply method further includes: In response to the load power being greater than or equal to the preset power, a control signal with a level state of a second level state is obtained to enable the second power supply unit, and an enable signal for shutting down the first protection circuit is generated to disconnect the first power supply branch, and the second power supply unit supplies power to the load.

[0019] The beneficial effects of the technical solution provided in the embodiments of the present application are: by implementing the power supply selection circuit, power supply circuit, circuit board and power supply method recorded in the embodiments of the present application, the power supply path can be switched according to the change of the load; in response to the change of the memory load power, no additional interface is added, and the power supply of the corresponding power is switched to power the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 This is a schematic diagram of a power supply selection circuit module provided in an embodiment of the present application; Figure 2 is a schematic diagram of a selection control module provided in an embodiment of the present application; Figure 3 is a circuit diagram of a control unit provided in an embodiment of the present application; Figure 4 is a schematic diagram of a voltage divider network circuit provided in an embodiment of the present application; Figure 5 This is another schematic diagram of a power supply selection circuit provided in an embodiment of the present application; Figure 6 is a schematic diagram of a power supply circuit provided in an embodiment of the present application; Figure 7 This is a schematic diagram of a power supply method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the implementation mode of this application will be clearly and completely described below in conjunction with the drawings in the implementation mode of this application. Obviously, the described implementation mode is only a part of the embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantity limitation, but indicate that there is at least one. The numbers in the drawings of the specification only indicate the distinction between various functional components or modules, and do not indicate the logical relationship between components or modules. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0024] Hereinafter, 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 accompanying drawings, the same reference numerals are given to components having substantially the same or similar structures and functions, and repeated descriptions thereof will be omitted.

[0025] In order to solve the problem that the increase in the number of computer memory sticks will lead to the additional addition of power supply interfaces and the occupation of more circuit board space, the present application provides the following embodiments: In some embodiments, Figure 1 As shown, a power supply selection circuit includes: a selection control module 100, a voltage divider network 200 and a first protection circuit 300.

[0026] The first protection circuit 300 is connected to the selection control module 100 to form a first power supply branch. The first protection circuit 300 is also connected to the selection control module 100 and the voltage divider network 200 to form a signal branch.

[0027] A control module 100 is selected to obtain a control signal, cooperate with the voltage divider network 200 to generate an enable signal corresponding to the control signal, and transmit the enable signal to the first protection circuit 300 through a signal branch to turn on or off the first power supply branch according to the level state of the control signal.

[0028] Optionally, as the device of the first protection circuit 300, an electronic device that can be turned on or off by a control signal, such as an electronic fuse, can be selected. Schematically, the device model MP5325C produced by Monolithic Power Systems, Inc. can be selected as the first protection circuit 300. The device model MP5325C is an electronic device that can protect the hot-swap circuit and protect the output voltage from the transient fluctuation of the input voltage.

[0029] The voltage divider network 200 is used to generate an enable signal with a voltage amplitude adapted to the first protection circuit 300 according to the control signal.

[0030] Since the enable signal is in the form of a logic level, the logic level includes a low level and a high level. Through the action of the voltage divider 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 MP5325C device 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 copy above 2.9V is used as a high level signal. Through the action of the voltage divider 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.

[0031] The first protection circuit 300 is used to output the power voltage obtained by its power input port 300 a to the selection control module 100 when the enable signal enables the first protection circuit 300 .

[0032] The power input port 300a of the first protection circuit 300 is used to obtain the power voltage. The first protection circuit 300 is connected in series between the power voltage and the selection control module 100 and is turned on or off by the enable signal to control whether to provide the power voltage to the selection control module 100.

[0033] like Figure 2 As 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.

[0034] The voltage dividing network 200 has a network voltage input port 200 a and an enable signal port 200 b .

[0035] The first protection circuit 300 further has an enable input port 300b and a voltage output port 300c.

[0036] Schematically, taking the device model MP5325C as the first protection circuit 300 as an example, its pins numbered 21 and / or 22 are used as power input ports 300a, one or more of its pins numbered 13, 14, 15, 16, 17, 18, 19 and 20 are used as voltage output ports 300c, and its pin numbered 2 is used as an enable input port 300b.

[0037] The control signal input port 100a is used to receive a control signal.

[0038] The selective pull-up port 100b is used to obtain the working voltage for processing the control signal. The working voltage can be provided by an independent power supply or by a power management module. In schematic form, the amplitude of the working voltage is 3.3V.

[0039] The selected voltage output port 100e is used to provide voltage to a load.

[0040] The network voltage input port 200a is used to obtain the working voltage for the voltage-dividing network. The working voltage can be provided by an independent power supply or by a power management module. Schematically, the amplitude of the working voltage is 12V.

[0041] 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 an enable signal corresponding to the control signal.

[0042] The voltage selection input port 100d is connected to the voltage output port 300c and is used to obtain the power supply voltage of the power supply input port 300a in the first power supply branch, and the enable input port 300b is used to obtain an enable signal.

[0043] Specifically, the selection control module 100 includes: a first control unit 110 and a second control unit 120; The first control unit 110 is configured to determine an enable signal according to a control signal.

[0044] The second control unit 120 is configured to output the voltage transmitted by the voltage output port 300 c of the first protection circuit 300 after the first protection circuit 300 is enabled.

[0045] The first control unit 110 has a first control port 110 a , a second control port 110 b , and a third control port 110 c .

[0046] The second control unit 120 has a fourth control port 120 a , a fifth control port 120 b , and a sixth control port 120 c .

[0047] After the first control port 110a is connected to the fourth control port 120a, it serves as a control signal input port 100a, the second control port 110b serves as a selective pull-up port 100b, the third control port 110c serves as a control signal output port 100c, the fifth control port 120b serves as a selective voltage input port 100d, and the sixth control port 120c serves as a selective voltage output port 100e.

[0048] like Figure 3 As shown, the first control unit 110 includes: a first switch device T 1 and the second switching device T 2 .

[0049] The first switching device T 1 Having: a first switch first pole T 11 , the first switch second pole T 12 And the first switch third pole T 13 .

[0050] The second switch device T 2 Having: the second switch first pole T 21 , the second switch second pole T 22 And the second switch third pole T 23 .

[0051] The first switch first pole T 11 As the first control port 110a, the second pole T of the first switch 12 The first pole of the second switch T 21 After the connection, the second switch second pole T 22 As the third control port 110c, the third pole T of the first switch 13 And the second switch third pole T 23 Connect to reference potential.

[0052] Preferably, the reference potential is ground potential.

[0053] Preferably, the first switching device T 1 and the second switching device T 2 Both are N-channel metal-oxide-semiconductor field-effect transistors.

[0054] The first switching device T 1 and the second switching device T 2 Taking N-channel metal-oxide-semiconductor field effect transistors as an example, the first switch first electrode T 11is the gate, the first switch second pole T 12 is the drain, the third pole of the first switch T 13 is the source; the first pole of the second switch T 21 is the gate, the second switch second pole T 22 The drain electrode, the second switch and the third electrode T 23 For the source.

[0055] When the first switch first pole T 11 When receiving a high level signal, the first switch device T 1 The second switch first pole T 21 The potential of the second switch device T 2 The voltage outputted by the third control port 110c is the voltage of the second switch second pole T 22 voltage.

[0056] When the first switch first pole T 11 When receiving a low level signal, The second control unit 120 includes: a third switch device T 3 and the fourth switching device T 4 ; The third switching device T 3 Having: the third switch first pole T 31 , the second pole of the third switch T 32 And the third switch third pole T 33 ; The fourth switch device T 4 Having: the fourth switch first pole T 41 , the fourth switch second pole T 42 And the fourth switch third pole T 43 ; The third switch first pole T 31 As the fourth control port 120a, the second electrode T of the third switch 32 The first pole of the fourth switch T 41 Connect the fourth switch second pole T 42 As the fifth control port 120b, the third pole T of the fourth switch 43 As the sixth control port 120c, the third switch third pole T 33 Connect to reference potential.

[0057] Preferably, the reference potential is ground potential.

[0058] The second control unit 120 further includes a first resistor R 1 ; The first resistor R 1 Connected in parallel to the first pole of the fourth switch T 41 The third pole T of the fourth switch 43between.

[0059] Preferably, the third switching device T 3 is an N-channel metal-oxide-semiconductor field effect transistor, the fourth switch device T 4 It is a P-channel metal-oxide-semiconductor field-effect transistor.

[0060] The third switch device T 3 is an N-channel metal-oxide-semiconductor field effect transistor, the fourth switch device T 4 Taking a P-channel metal-oxide-semiconductor field effect transistor as an example, the first electrode T of the third switch 31 is the gate, the second pole of the third switch T 32 is the drain, the third switch third pole T 33 The first pole of the fourth switch T 41 is the gate, the second pole of the fourth switch T 42 is the source, the third pole of the fourth switch T 43 For the drain.

[0061] like Figure 4 As shown, the voltage divider network 200 includes a second resistor R 2 And the third resistor R 3 .

[0062] The second resistor R 2 One end of the voltage divider network 200 is used as the network voltage input port 200a, and the second resistor R 2 The other end of the third resistor R 3 One end of the third resistor R 3 The other end is connected to a reference potential. Preferably, the reference potential is a ground potential.

[0063] like Figure 5 As shown, the power supply matching circuit also includes a diode D; The anode of the diode D is connected to the selection voltage input port 100d, and the cathode of the diode D is connected to the selection voltage output port 100e.

[0064] As described above, the anode of the diode D is connected to the second electrode T of the fourth switch. 42 Connect the cathode of diode D to the third pole of the fourth switch T 43 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 is turned on, the third electrode T 43Due to the clamping effect of the diode, its point 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 fourth switch device T is controlled 4 The low level amplitude of the conduction is about 0V. By setting the diode D, the fourth switch device T 4 The gate-source voltage of the fourth switch device T is lower than its turn-on threshold voltage, so that 4 Open quickly.

[0065] The power supply selection circuit also includes: a fourth resistor R 4 .

[0066] The fourth resistor R 4 It is connected in series between the control signal output port 100c and the enable signal port 200b to limit the current.

[0067] In some other embodiments, a power supply circuit, such as Figure 6 As shown, it includes the power supply matching circuit described above, the first power supply unit 400, the second power supply unit 500, the second protection circuit 600, the fifth resistor R 5 and the sixth resistor R 6 .

[0068] The second protection circuit 600 is connected to a load 900. The load 900 has two working states: a light load 910 or a heavy load 920.

[0069] The first power supply unit 400 has: a first voltage output port 400a for providing a first power supply voltage.

[0070] 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.

[0071] The second voltage output port 500a is used to provide a second power supply voltage.

[0072] The load signal output port 500 b is connected to the control signal input port 100 a and is used to generate a control signal according to the load state signal and transmit the control signal to the selection control module 100 .

[0073] The load status receiving port 500c is used to obtain a load status signal.

[0074] The first power supply voltage and the second power supply voltage may be voltages of the same voltage amplitude, or voltages of different voltage amplitudes. In the embodiments described in the present application, preferably, the first power supply voltage and the second power supply voltage have the same amplitude.

[0075] The load status signal is used to indicate the load status of the 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 sticks connected to the power supply circuit can be used as the basis for distinguishing between light load and heavy load. For example: connecting less than two memory sticks is light load; connecting three or more memory sticks is heavy load.

[0076] The control signal is generated according to the load state signal, corresponding to the light load or heavy load state; the control power supply selection circuit selects the corresponding power supply unit according to the load state.

[0077] The first voltage output port 400a is connected to the power input port 300a, and provides power to the first protection circuit 300, providing a voltage of the output voltage of the first power supply unit 400, and a power of the first power. The first voltage output port 400a is also connected to the network voltage input port 200a, and provides a working voltage to the voltage divider network 200.

[0078] The second voltage output port 500a is connected to the selected voltage output port 100e to form a second power supply branch, which provides the load with an output voltage of the second power supply unit 500 and an electric energy supply with a second power.

[0079] Usually, 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.

[0080] A fifth switching device T is provided in the second power supply unit 500. 5 Preferably, the fifth switching device T 5 The gate of the fifth switch device serves as a load state receiving port 500c, the drain serves as a load signal output port 500b, and the source is grounded.

[0081] After the load state signal received by the load state 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 switch device T 5 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 a 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 provides the load with a voltage equal to the output voltage of the first power supply unit 400 and a power equal to the first power supply.

[0082] After the load status signal received by the load status receiving port 500c is a high load signal, the second power supply branch is enabled to supply power to the load. At the same time, the fifth switch device T is turned on. 5The 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 provides the load with an output voltage of the second power supply unit 500 and an electric energy supply of the second power.

[0083] The second protection circuit 600 is connected in series between the selected voltage output port 100e and the load. Optionally, the second protection circuit 600 is a fuse.

[0084] The fifth resistor R 5 One end of the fifth resistor R is connected to the load state receiving port. 5 The other end is connected to provide a logic level operating voltage.

[0085] The sixth resistor R 6 One end of the sixth resistor R 6 The other end is connected to provide a logic level operating voltage.

[0086] Optionally, the fifth resistor R 5 The other end of the sixth resistor R 6 The other end is connected to the same working voltage.

[0087] Preferably, the operating voltage is provided by the first power supply unit 400, and the amplitude of the operating voltage is 3.3V.

[0088] A power supply selection circuit, 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; Select a control module, which is used to obtain a control signal, cooperate with a voltage divider network to generate an enable signal corresponding to the control signal, and transmit the enable signal to the first protection circuit through a signal branch, so as to turn on or off the first power supply branch according to the level state of the control signal; A voltage divider network, used for generating 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 from its power supply input port to the selection control module when the enable signal enables the first protection circuit.

[0089] Specifically, 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 divider 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 the control signal, the optional pull-up port is used to obtain the working voltage for processing the control signal, the optional voltage output port is used to provide voltage to the load, the network voltage input port is used to obtain the working voltage for the voltage divider network, the control signal output port is connected to the enable signal port and the enable input port, and the optional voltage input port is connected to the voltage output port.

[0090] Specifically, the selection control module includes: a first control unit and a second control unit; A first control unit, configured to determine an enable signal according to a control signal; The second control unit is used to output the voltage transmitted by the voltage output port of the first protection circuit after the first protection circuit is enabled.

[0091] Specifically, 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; After the first control port is connected to the fourth control port, it serves as a control signal input port, the second control port serves as a selective pull-up port, the third control port serves as a control signal output port, the fifth control port serves as a selective voltage input port, and the sixth control port serves as a selective voltage output port.

[0092] Specifically, the first control unit includes a first switching device and a second switching device; The first switch device comprises: a first switch first pole, a first switch second pole and a first switch third pole; The second switch device comprises: a second switch first pole, a second switch second pole and a second switch third pole; The first pole of the first switch serves as the first control port, the second pole of the first switch is connected to the first pole of the second switch and serves as the second control port, and the second pole of the second switch serves as the third control port.

[0093] Preferably, the first switch device and the second switch device are both N-channel metal-oxide-semiconductor field effect transistors.

[0094] Specifically, the second control unit includes: a third switch device and a fourth switch device; The third switch device comprises: a third switch first pole, a third switch second pole and a third switch third pole; The fourth switch device comprises: a fourth switch first electrode, a fourth switch second electrode and a fourth switch third electrode; 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.

[0095] Preferably, the second control unit further comprises a first resistor; The first resistor is connected in parallel between the first electrode of the fourth switch and the third electrode of the fourth switch.

[0096] 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.

[0097] Specifically, the voltage divider network includes a second resistor and a third resistor; One end of the second resistor serves as a network voltage input port of the voltage divider network, and the other end of the second resistor is connected to one end of the third resistor and serves as an enable signal port of the voltage divider network.

[0098] Preferably, the power supply matching 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.

[0099] Preferably, the power supply matching circuit further includes: a fourth resistor; The fourth resistor is connected in series between the control signal output port and the enable signal port.

[0100] The power supply circuit principle is described for the light load and heavy load conditions. Taking the memory power supply circuit as an example, the load is a dual-inline memory module (DIMM), and the first protection circuit 300 uses a device of model MP5325C. When the load is 1 or 2 dual-inline memory modules, the load is a light load; when the load is 3 or more dual-inline memory modules (usually 3 or 4), the load is a heavy load. The first power supply unit provides 12V, 75W power supply; the second power supply unit provides 12V, 150W power supply.

[0101] When the load is light, the low load signal is used as the load state signal and transmitted to the load state receiving port 500c. After the load state receiving port 500c receives the low load signal as the load state signal, the power supply of the second power supply branch is turned off. At the same time, the fifth switch device T is turned off. 5 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 a control signal. Under the action of the high level control signal, the first switch device T 1 The second switch device T 2Turn off, the third switch device T 3 The fourth switch device T 4 After the voltage is divided by the voltage divider network 200, a high level is transmitted to the enable input port 300b. The first protection circuit 300 receives the high level and is enabled, and the first power supply branch is turned on. After the output voltage of the first power supply unit 400 passes through the selected voltage input port 100d, it is output from the selected voltage output port 100e. The load is provided with 12V, 75W of power supply through the second protection circuit 600. It should be noted that the role of the diode D is to 4 When it is not conducting, its conducting speed is increased, so that the first power supply branch is quickly conducted; after it is conducted, current backflow is prevented.

[0102] When the load is heavy, the 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 of the seat load status signal, the power supply of the second power supply branch is enabled. At the same time, the fifth switch device T is turned off. 5 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 low level control signal, the first switch device T 1 Turn off, the second switch device T 2 The third switch device T 3 Turn off, the fourth switch device T 4 After voltage division by the voltage divider network 200, a low level is transmitted to the enable input port 300b, and the first protection circuit 300 receives the low level and is turned off, disconnecting the first power supply branch. At this time, only the second power supply unit 500 provides 12V, 75W power supply to the load through the second protection circuit 600.

[0103] Preferably, the port for transmitting electric energy to the load is a gold finger. Whether the first power supply unit 400 or the second power supply unit 500 supplies power to the load, the power supply port of the gold finger is reused. In addition, the two sets of power supply branches do not supply power to the load at the same time, avoiding the current sharing problem when two power supplies are supplied at the same time.

[0104] In other embodiments, a circuit board includes the power supply matching circuit described in the first aspect, or the power supply circuit described in the second aspect.

[0105] In other embodiments, Figure 7 As shown, a power supply method is applied to the power supply matching circuit recorded in the first aspect, or the power supply circuit recorded in the second aspect, comprising: S100: connecting the first voltage output port to the power input port, connecting the second voltage output port to the selection voltage input port, and connecting the load signal output port to the control signal input port; S200: In response to the load power being less than the preset power, obtaining a control signal whose level state is a first level state to generate an enable signal for enabling the first protection circuit, and disconnecting the second power supply branch; S300: enabling the first protection circuit according to the enable signal to turn on the first power supply branch, so that the first power supply unit supplies power to the load.

[0106] Optionally, the power supply method further includes: S200ʹ: In response to the load power being greater than or equal to the preset power, a control signal whose level state is a second level state is obtained to enable the second power supply unit, and an enable signal for shutting down the first protection circuit is generated to disconnect the first power supply branch, and the second power supply unit supplies power to the load.

[0107] By implementing the power supply selection circuit recorded in the embodiment of the present application, the conduction or shutdown of the first power supply branch can be switched according to the change of the load, and the diode can quickly turn on the fourth switch device to make the first power supply branch quickly turn on, and after the fourth switch device is turned on, prevent the current from flowing; the power supply circuit can switch the power supply path according to the change of the load; in response to the change of the memory load power, no additional interface is added, and the power supply of the corresponding power is switched to power the load, and there is no need to consider the current sharing problem; the implementation of the power supply method can quickly adjust the adaptive power supply unit to power the load according to the change of the load state.

[0108] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present application, which will not be described one by one here.

[0109] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made to those skilled in the art without departing from the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of this application should be included in the scope of protection 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, and may also include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A power supply matching circuit, characterized in that: include: Selecting a control module, a voltage divider 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 divider network to form a signal branch; The selection control module is used to obtain a control signal, cooperate with the voltage divider network to generate an enable signal corresponding to the control signal, and transmit the enable signal to the first protection circuit 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; The voltage divider 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 from its power input port to the selection control module when the enable signal enables the first protection circuit.

2. The power supply matching circuit according to claim 1, characterized in that: 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 divider network has: a network voltage input port and an enable signal port; The first protection circuit further comprises: an enable input port and a voltage output port; The control signal input port is used to receive a control signal, the selective control pull-up port is used to obtain an operating voltage for processing the control signal, the selective control voltage output port is used to provide a voltage to a load, the network voltage input port is used to obtain an operating voltage for the voltage divider network to operate, the control signal output port is connected to the enable signal port and the enable input port, and the selective control voltage input port is connected to the voltage output port.

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

4. The power supply matching circuit according to claim 3, characterized in that: 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; 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 selective pull-up port, the third control port serves as the control signal output port, the fifth control port serves as the selective voltage input port, and the sixth control port serves as the selective voltage output port.

5. The power supply matching circuit according to claim 4, characterized in that: The first control unit includes a first switching device and a second switching device; The first switch device comprises: a first switch first pole, a first switch second pole and a first switch third pole; The second switch device comprises: a second switch first pole, a second switch second pole and a second switch third pole; The first pole of the first switch serves as the first control port, the second pole of the first switch is connected to the first pole of the second switch and serves as the second control port, and the second pole of the second switch serves as the third control port.

6. The power supply matching circuit according to claim 5, characterized in that: The first switch device and the second switch device are both N-channel metal-oxide-semiconductor field effect transistors.

7. The power supply matching circuit according to claim 4, characterized in that: The second control unit includes: a third switch device and a fourth switch device; The third switch device comprises: a third switch first pole, a third switch second pole and a third switch third pole; The fourth switch device comprises: a fourth switch first pole, a fourth switch second pole and a fourth switch third pole; 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.

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

9. The power supply matching circuit according to claim 7, 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.

10. The power supply matching circuit according to claim 1 or 2, characterized in that: The voltage divider network includes a second resistor and a third resistor; One end of the second resistor serves as a network voltage input port of the voltage divider network, and the other end of the second resistor is connected to one end of the third resistor and serves as an enable signal port of the voltage divider network.

11. The power supply matching circuit according to claim 1 or 2, characterized in that: The power supply matching circuit also 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.

12. The power supply matching circuit according to claim 1 or 2, characterized in that: The power supply matching circuit further includes: a fourth resistor; The fourth resistor is connected in series between the control signal output port and the enable signal port.

13. A power supply circuit, characterized in that: The power supply circuit comprises the power supply matching circuit according to any one of claims 1 to 12, 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 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 state signal, and transmit the control signal to the selection control module, and the load state receiving port is used to obtain the load state signal; The second protection circuit is connected in series between the selected voltage output port and the load, one end of the fifth resistor is connected to the load state receiving port, and one end of the sixth resistor is connected to the selected pull-up port.

14. A power supply method, characterized in that: The power supply circuit according to claim 13 comprises: Connecting the first voltage output port to the power input port, connecting the second voltage output port to the selected control voltage input port, and connecting the load signal output port to the control signal input port; In response to the load power being less than the preset power, a control signal whose level state is a first level state is obtained to generate an enable signal for enabling the first protection circuit, and disconnect the second power supply branch; The first protection circuit is enabled according to the enable signal to turn on the first power supply branch, so that the first power supply unit supplies power to the load.

15. The power supply method according to claim 14, characterized in that: The method further comprises: In response to the load power being greater than or equal to the preset power, a control signal with a level state of a second level state is obtained to enable the second power supply unit, and an enable signal for shutting down the first protection circuit is generated to disconnect the first power supply branch, and the second power supply unit supplies power to the load.

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