A power supply circuit for computing power equipment
By dividing the computing power board of the cloud computing power device into two groups and connecting in series, combining the load mid-point voltage clamping circuit and the LLC half-bridge circuit, the loss and heat dissipation problems caused by low output voltage and large current in the existing technology are solved, and the loss and heat dissipation problems are realized. More efficient and stable power supply circuits.
Patent Information
- Application Number
- CN202010944818.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-09-10
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2040-09-10
AI Technical Summary
The output voltage of the existing cloud computing power equipment power supply circuit is low, resulting in a large output current, increasing wire loss and heat dissipation pressure, and reducing the efficiency and stability of the equipment.
By dividing multiple computing power boards into two groups and connecting them in series, using a load mid-point voltage clamping circuit and an LLC half-bridge circuit, the output voltage is increased and the output current is reduced, thereby reducing power loss.
At the same output power, the efficiency of the equipment is improved, the power loss is reduced, the temperature of the equipment is reduced, and the stability and energy-saving effect of the equipment is improved.
Smart Images
Figure CN112019061B_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a power supply circuit, and in particular to a power supply circuit for a computing device. [Background Technology]
[0002] The output voltage of the power supply circuit of the cloud computing equipment is the rated low voltage output. The cloud computing equipment uses multiple computing boards in parallel to achieve the required data operations. Figure 1 As shown, the equipment has A\B\C…N+ hashboards, then all the hashboard inputs are connected in parallel, the power supply output voltage is low, the output power is large, and the output current is large. The working voltage of the hashboard is V, and each hashboard requires a current of I. After N boards are connected in parallel, the total output current is N*I, and the total output voltage remains unchanged. The disadvantages are low output voltage and large output current, which cause large wire loss from the power supply output to the hashboard, and the lost energy is consumed in the form of heat. At the same time, it also increases the heat dissipation pressure of the equipment and increases the environmental application temperature of the product. In the application of electronic products, material failure caused by heat concentration accounts for 65%-80% of the total failure rate. Reducing the use temperature of electronic products will greatly improve the energy consumption and stability of the products.
[0003] The mainstream single-phase voltage range in China is 200-264Vac. When single-phase, the current of one power port is limited to 16A. When the output power reaches 3KW, the current at the input terminal can easily reach the critical value. If the equipment requires higher computing power, energy efficiency and safety, it is necessary to improve the efficiency of the power supply. At the same time, reducing losses and increasing margins also provide practical guarantees for the efficient and safe operation of equipment. [Summary of the invention]
[0004] The technical problem to be solved by the present invention is to provide a power supply circuit for a computing device with small output current, high efficiency and small loss.
[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is a power supply circuit of a computing power device, including a main circuit, a control circuit and multiple computing power boards as loads, the main circuit includes a load midpoint voltage clamping circuit, the multiple computing power boards are divided into two groups of equal number, and the two groups of computing power boards are connected in series to form a load circuit; the positive terminal of the load circuit is connected to the positive voltage output port of the load midpoint voltage clamping circuit, and the negative terminal of the load circuit is connected to the negative voltage output port of the load midpoint voltage clamping circuit; the connection point between the two groups of computing power boards in the load circuit is connected to the midpoint voltage output port of the load midpoint voltage clamping circuit as the load midpoint.
[0006] The power supply circuit of the computing power equipment described above, the main circuit includes a transformer and an LLC half-bridge circuit, the LLC half-bridge circuit includes a half-bridge and an LLC resonant circuit composed of a first switch tube and a second switch tube connected in series; one end of the half-bridge is connected to the positive pole of the DC power supply, and the other end is connected to the ground, the LLC resonant circuit includes a series-connected resonant inductor, a resonant capacitor and the primary winding of the transformer; one end of the LLC resonant circuit is connected to the midpoint of the half-bridge, and the other end is grounded; the load midpoint voltage clamping circuit includes the first secondary winding of the transformer, the second secondary winding of the transformer, the fourth switch tube, the fifth The switch tube, the seventh switch tube and the eighth switch tube, the same-name end of the first secondary winding and the opposite-name end of the second secondary winding are connected to the positive voltage output port of the voltage clamping circuit, the opposite-name end of the first secondary winding is grounded through the seventh switch tube, the same-name end of the second secondary winding is grounded through the fifth switch tube, and the negative voltage output port of the load midpoint voltage clamping circuit is grounded; the center point of the first secondary winding is connected to the midpoint voltage output port of the load midpoint voltage clamping circuit through the eighth switch tube, and the center point of the second secondary winding is connected to the midpoint voltage output port of the load midpoint voltage clamping circuit through the fourth switch tube.
[0007] The power supply circuit of the computing power device described above, the load midpoint voltage clamping circuit includes a first capacitor, a second capacitor and a third capacitor, the first capacitor is connected between the positive voltage output port and the negative voltage output port of the load midpoint voltage clamping circuit, the second capacitor is connected between the positive voltage output port and the midpoint voltage output port of the load midpoint voltage clamping circuit, and the third capacitor is connected between the midpoint voltage output port and the negative voltage output port of the load midpoint voltage clamping circuit.
[0008] In the power supply circuit of the computing power equipment described above, the same-name end of the primary winding of the transformer is connected to the midpoint of the half bridge through the LLC resonant circuit, and the opposite-name end of the primary winding of the transformer is grounded through a resonant capacitor; the positive electrode of the DC power supply, the first switch tube, the second switch tube and the ground are connected in series in sequence; the center point of the first secondary winding divides the first secondary winding into an upper winding and a lower winding, the same-name end of the first secondary winding is located at the upper winding of the first secondary winding, and the opposite-name end of the first secondary winding is located at the lower winding of the first secondary winding; the center point of the second secondary winding divides the second secondary winding into an upper winding and a lower winding, the same-name end of the second secondary winding is located at the lower winding of the second secondary winding, and the opposite-name end of the second secondary winding is located at the upper winding of the second secondary winding.
[0009] The power supply circuit of the computing power device described above includes the following working steps: the first switch tube of the LLC half-bridge circuit is turned on, the second switch tube is turned off, and the resonant capacitor of the LLC resonant circuit is charged; the fourth switch tube and the fifth switch tube of the load midpoint voltage clamping circuit are turned off, the seventh switch tube and the eighth switch tube are turned on, and the upper winding of the first secondary winding outputs current from the same-name end of the first secondary winding, and the current returns through the positive voltage output port, the positive pole of the load circuit and the first group of computing boards. The returned current returns to the upper winding of the first secondary winding through the midpoint voltage output port, the eighth switch tube and the center point of the first secondary winding; at the same time, the lower winding of the first secondary winding outputs current from the center point of the secondary winding, and the current flows from the middle point of the load into the second group of computing boards through the eighth switch tube and the midpoint voltage output end, and the current returned from the second group of computing boards returns to the lower winding of the first secondary winding through the grounding point, the seventh switch tube and the opposite-name end of the first secondary winding.
[0010] The power supply circuit of the computing power device described above includes the following working steps: the second switch tube of the LLC half-bridge circuit is turned on, the first switch tube is turned off, and the resonant capacitor of the LLC resonant circuit is discharged; the fourth switch tube and the fifth switch tube of the load midpoint voltage clamp circuit are turned on, the seventh switch tube and the eighth switch tube are turned off, and the upper winding of the second secondary winding outputs current from the opposite end of the first secondary winding, and the current returns through the positive voltage output port, the positive pole of the load circuit and the first group of computing boards. The returned current returns to the upper winding of the second secondary winding through the midpoint voltage output port, the fifth switch tube and the center point of the second secondary winding; at the same time, the lower winding of the second secondary winding outputs current from the center point of the two secondary windings, and the current flows from the midpoint of the load into the second group of computing boards through the fifth switch tube and the midpoint voltage output end, and the current returned from the second group of computing boards returns to the lower winding of the second axis secondary winding through the grounding point, the fourth switch tube and the same end of the second secondary winding.
[0011] The present invention can meet the power supply of the cloud computing equipment control board by connecting two groups of computing boards in series. When the output power is the same, by increasing the output voltage and reducing the output current, the efficiency of the equipment can be improved, and the energy saving effect and stability of the equipment can be improved. [Drawings]
[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0013] Figure 1 It is a circuit diagram of the cloud computing power supply circuit in the prior art.
[0014] Figure 2 1 is a circuit diagram of a power supply circuit of a computing device according to an embodiment of the present invention.
[0015] Figure 3 This is a current flow diagram of the first process of the power supply circuit of the computing power device according to an embodiment of the present invention.
[0016] Figure 4 This is a current flow diagram of the second process of the power supply circuit of the computing power device according to an embodiment of the present invention. [Specific implementation method]
[0017] like Figure 2 As shown in the figure, the hashboards are divided into two groups according to the total number, and the two groups of hashboards are connected in series. The output voltage of the power supply is doubled to 48V, and the output current is 1 / 2 of the original. The line loss of the power supply output is also reduced by 1 / 2, which can improve the overall efficiency of the equipment and reduce the temperature of the power supply circuit.
[0018] like Figure 2 As shown, the positive terminal of the load circuit composed of two groups of hash boards connected in series is connected to the positive 48V port of the power output end, and the negative terminal of the load circuit is connected to the ground AGND. The connection point of the two groups of hash boards in series is the midpoint of the load, and the midpoint of the negative pole is connected to the midpoint 24V port of the power output end. A capacitor C200 is connected between the positive 48V port of the power output end and the ground AGND, a capacitor C192 is connected between the positive 48V port of the power output end and the midpoint 24V port of the power output end, and a capacitor C195 is connected between the midpoint 24V port of the power output end and the ground AGND.
[0019] like Figure 2 As shown, the circuit driving the primary side of the transformer is a commonly used LLC half-bridge circuit, which includes MOS tube Q95, MOS tube Q96, resonant capacitor C201, primary winding T1-E of high-frequency transformer T1, and resonant inductor L11. The circuit charging cycle is connected in series by MOS tube Q95, resonant capacitor C201, primary winding T1-E of high-frequency transformer T1, and resonant inductor L11. The circuit discharge cycle is connected in series by MOS tube Q96, resonant capacitor C201, primary winding T1-E of high-frequency transformer T1, and resonant inductor L11.
[0020] The load midpoint voltage clamping circuit is composed of MOS tube Q84, MOS tube Q85, MOS tube Q87, MOS tube Q88 and two identical secondary windings of the transformer. The center tap of the first secondary winding (H arm) uses MOS tube Q88 as a switch and is connected to the midpoint of the load (the midpoint 24V port of the power supply output end); the center tap of the second secondary winding (L arm) uses MOS tube Q88 as a switch and is connected to the midpoint of the load (the midpoint 24V port of the power supply output end).
[0021] The center tap of the first secondary winding (H arm) divides the first secondary winding (H arm) into an upper winding T1-A (upper arm H1) and a lower winding T1-B (lower arm H2), and the low potential end of the upper arm H1 is connected to the high potential end of the lower arm H2. The center tap of the second secondary winding (L arm) divides the second secondary winding (L arm) into an upper winding T1-C (upper arm L1) and a lower winding T1-D (lower arm L2), and the low potential end of the upper arm L1 is connected to the high potential end of the lower arm L2.
[0022] The high potential end of the first secondary winding (H arm) and the high potential end of the second secondary winding (L arm) are connected to the positive 48V port of the power supply output end, the low potential end of the first secondary winding (H arm) is grounded to AGND through the MOS tube Q87, and the low potential end of the second secondary winding (L arm) is grounded to AGND through the MOS tube Q84.
[0023] like Figure 3 As shown, when the LLC half-bridge circuit MOS tube Q95 of the primary side is turned on and the MOS tube Q96 is turned off, the DC+ voltage charges the resonant capacitor C201 through the MOS tube Q95, the resonant inductor L11, and the primary winding T1-E of the transformer. At this time, the phase of the first secondary winding (H arm) is the same as the phase of the primary winding T1-E, and the control circuit outputs a high level to turn on the MOS tubes Q87 and Q88. The current output by the winding T1-A (upper arm H1) of the first secondary winding (H arm) is output through the positive 48V port of the power output end, flows into the positive pole of the first group of computing boards, flows out from the negative pole of the computing boards of the same group, to the midpoint 24V port of the power output end, and then flows back to the midpoint of the first secondary winding (H arm) through the MOS tube Q88.
[0024] At the same time, the current flowing out from the high potential end of the lower winding T1-B (lower arm H2) of the first secondary winding (H arm) passes through the MOS tube Q88 to the midpoint 24V port of the output power supply output end, flows into the positive electrode of the second group of computing boards, and then flows out from the negative electrode of the computing board of the same group, passes through AGND, and then flows back to the low potential end of the lower winding T1-B (lower arm H2) of the first secondary winding (H arm) through the MOS tube Q87.
[0025] Because the upper winding T1-A (upper arm H1) and the lower winding T1-B (lower arm H2) of the first secondary winding (H arm) are turned on at the same time, the MOS transistor Q87 and the MOS transistor Q88 are turned on at the same time in one working cycle. At this time, the upper winding T1-A (upper arm H1) and the lower winding T1-B (lower arm H2) both have current flowing through the midpoint connection of the first secondary winding at the same time.
[0026] like Figure 4As shown, when the MOS tube Q95 of the LLC half-bridge circuit on the primary side is turned off and the MOS tube Q96 is turned on, the energy stored in the resonant capacitor C201 is discharged through the primary winding T1-E of the transformer, the resonant inductor L11 and the MOS tube Q96.
[0027] At this time, the phase of the second secondary winding (L arm) is the same as that of the primary winding T1-E, and the control circuit outputs a high level to turn on MOS tubes Q84 and Q85. The current output by the winding T1-C (upper arm L1) of the second secondary winding (L arm) is output through the positive 48V port of the power output end, flows into the positive pole of the first group of computing boards, flows out from the negative pole of the computing board of the same group, to the midpoint 24V port of the power output end, and then flows back to the midpoint of the second secondary winding (L arm) through the MOS tube Q85.
[0028] At the same time, the current flowing out from the high potential end of the lower winding T1-D (lower arm L2) of the second secondary winding (L arm) passes through the MOS tube Q85 to the midpoint 24V port of the output power supply output end, flows into the positive electrode of the second group of computing boards, and then flows out from the negative electrode of the computing board of the same group, passes through AGND, and then flows back to the low potential end of the lower winding T1-D (lower arm L2) of the second secondary winding (L arm) through the MOS tube Q84.
[0029] Because the upper winding T1-C (upper arm L1) and the lower winding T1-D (lower arm L2) of the second secondary winding (L arm) are turned on at the same time, the MOS transistor Q84 and the MOS transistor Q85 are turned on at the same time in one working cycle. At this time, the upper winding T1-C (upper arm L1) and the lower winding T1-D (lower arm L2) both have current flowing through the midpoint connection of the second secondary winding at the same time.
[0030] This embodiment achieves stable output of two sets of output voltages by clamping the load midpoint voltage. The lower winding voltage and the upper winding voltage at the midpoint of the power supply end are in the same output control loop. When the output load remains unchanged, due to the effect of the midpoint clamp, the total voltage of the positive cycle = H1 voltage + H2 voltage. The total voltage of the negative cycle = L1 voltage + L2 voltage.
[0031] In the above embodiments of the present invention, when the power supply current of the cloud computing device control board is large, the cloud computing device control board can be connected in series to meet the power supply of the cloud computing device control board. When the output power is the same, by increasing the output voltage and reducing the output current, the efficiency of the device can be improved, and the energy saving effect and stability of the device can be improved.
Claims
1. A power supply circuit for a computing device, comprising a main circuit, a control circuit and a plurality of computing boards as loads, characterized in that: The main circuit includes a load midpoint voltage clamping circuit, and multiple hashboards are divided into two groups of equal number, and the two groups of hashboards are connected in series to form a load circuit; the positive terminal of the load circuit is connected to the positive voltage output port of the load midpoint voltage clamping circuit, and the negative terminal of the load circuit is connected to the negative voltage output port of the load midpoint voltage clamping circuit; the connection point between the two groups of hashboards in the load circuit is connected to the midpoint voltage output port of the load midpoint voltage clamping circuit as the load midpoint; the main circuit includes a transformer and an LLC half-bridge circuit, and the LLC half-bridge circuit includes a half-bridge and an LLC resonant circuit composed of a first switch tube and a second switch tube connected in series; one end of the half-bridge is connected to the positive pole of the DC power supply, and the other end is connected to the ground, and the LLC resonant circuit includes a series-connected resonant inductor, a resonant capacitor and the primary winding of the transformer; LLC One end of the resonant circuit is connected to the midpoint of the half bridge, and the other end is grounded; the load midpoint voltage clamping circuit includes the first secondary winding of the transformer, the second secondary winding of the transformer, the fourth switch tube, the fifth switch tube, the seventh switch tube and the eighth switch tube, the same-name end of the first secondary winding and the opposite-name end of the second secondary winding are connected to the positive voltage output port of the voltage clamping circuit, the opposite-name end of the first secondary winding is grounded through the seventh switch tube, the same-name end of the second secondary winding is grounded through the fifth switch tube, and the negative voltage output port of the load midpoint voltage clamping circuit is grounded; the center point of the first secondary winding is connected to the midpoint voltage output port of the load midpoint voltage clamping circuit through the eighth switch tube, and the center point of the second secondary winding is connected to the midpoint voltage output port of the load midpoint voltage clamping circuit through the fifth switch tube.
2. The power supply circuit of the computing device according to claim 1, characterized in that: The load midpoint voltage clamping circuit includes a first capacitor, a second capacitor and a third capacitor. The first capacitor is connected between the positive voltage output port and the negative voltage output port of the load midpoint voltage clamping circuit, the second capacitor is connected between the positive voltage output port and the midpoint voltage output port of the load midpoint voltage clamping circuit, and the third capacitor is connected between the midpoint voltage output port and the negative voltage output port of the load midpoint voltage clamping circuit.
3. The power supply circuit of the computing device according to claim 1, characterized in that: The same-name end of the primary winding of the transformer is connected to the midpoint of the half bridge through the LLC resonant circuit, and the opposite-name end of the primary winding of the transformer is grounded through a resonant capacitor; the positive electrode of the DC power supply, the first switch tube, the second switch tube and the ground are connected in series in sequence; the center point of the first secondary winding divides the first secondary winding into an upper winding and a lower winding, the same-name end of the first secondary winding is located at the upper winding of the first secondary winding, and the opposite-name end of the first secondary winding is located at the lower winding of the first secondary winding; the center point of the second secondary winding divides the second secondary winding into an upper winding and a lower winding, the same-name end of the second secondary winding is located at the lower winding of the second secondary winding, and the opposite-name end of the second secondary winding is located at the upper winding of the second secondary winding.
4. The power supply circuit of the computing device according to claim 3, characterized in that: The method comprises the following working steps: the first switch tube of the LLC half-bridge circuit is turned on, the second switch tube is turned off, and the resonant capacitor of the LLC resonant circuit is charged; the fourth switch tube and the fifth switch tube of the load midpoint voltage clamp circuit are turned off, the seventh switch tube and the eighth switch tube are turned on, the upper winding of the first secondary winding outputs current from the same-name end of the first secondary winding, and the current returns through the positive voltage output port, the positive pole of the load circuit and the first group of computing boards, and the returned current returns to the upper winding of the first secondary winding through the midpoint voltage output port, the eighth switch tube and the center point of the first secondary winding; at the same time, the lower winding of the first secondary winding outputs current from the center point of the secondary winding, and the current flows from the load midpoint into the second group of computing boards through the eighth switch tube and the midpoint voltage output end, and the current returned from the second group of computing boards returns to the lower winding of the first secondary winding through the grounding point, the seventh switch tube and the opposite-name end of the first secondary winding.
5. The power supply circuit of the computing device according to claim 3, characterized in that: The method comprises the following working steps: the second switch tube of the LLC half-bridge circuit is turned on, the first switch tube is turned off, and the resonant capacitor of the LLC resonant circuit is discharged; The fourth switch tube and the fifth switch tube of the load midpoint voltage clamp circuit are turned on, and the seventh switch tube and the eighth switch tube are turned off. The upper winding of the second secondary winding outputs current from the opposite-name end of the first secondary winding, and the current returns through the positive voltage output port, the positive pole of the load circuit and the first group of computing boards. The returned current returns to the upper winding of the second secondary winding through the midpoint voltage output port, the fifth switch tube and the center point of the second secondary winding; at the same time, the lower winding of the second secondary winding outputs current from the center point of the second secondary winding, and the current flows from the midpoint of the load into the second group of computing boards through the fifth switch tube and the midpoint voltage output end. The current returned from the second group of computing boards returns to the lower winding of the second axis secondary winding through the grounding point, the fourth switch tube and the same-name end of the second secondary winding.
Citation Information
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