A TLVR feedback circuit, a PCB board and a power supply circuit

Abstract

The present invention discloses a TLVR feedback circuit, a PCB board and a power supply circuit, relating to the technical field of power supply control. The first end of the adjustable resistor module is connected to a DC power supply, the second end is respectively connected to the SENSE feedback end of the TLVR_SENSE feedback module and the DP feedback end of the controller, and the third end is connected to the positive output end of the power output module and is also connected to the DP input end of the load when there is a load. Thus, the adjustable resistor module can provide equivalent resistors with different resistance values, changing the voltage feedback signal received by the controller. Furthermore, when there is no load, the controller still controls the controllable switch in the power output module to conduct according to the voltage feedback signal received by its own feedback end to ensure power output, that is, overvoltage protection is not triggered, meeting the normal power-on requirements under no-load or light-load conditions and ensuring the normal operation of the entire power supply circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply control, and in particular to a TLVR feedback circuit, a PCB board and a power supply circuit. Background Art

[0002] With the widespread application of servers, more and more functions need to be realized, and higher requirements are also put forward for server design. In order to meet application requirements, more and more new technologies and new devices are developed and applied to server design. TLVR inductor (Trans-inductor Voltage Regulator) is an emerging inductor device. Due to its unique performance, it can be applied to the power supply design of servers, which can significantly reduce the design cost. Therefore, it has now become a major device in circuit design.

[0003] In the prior art, in the design of server power supply circuits using TLVR inductors, please refer to Figure 1 , Figure 1 The present invention is a schematic diagram of a structure of a server power supply circuit design in the prior art. The input voltage of the power supply is sequentially passed through the switch module, the TLVR inductor, and the filter circuit to obtain the output voltage. The output voltage is used to power the load. In addition, considering that different loads have different power supply requirements and the load weight also varies, it is necessary to design a feedback circuit to collect the voltage feedback signal to the controller. The controller controls the on and off of the switch tube in the switch module and the corresponding duration according to the voltage feedback signal to meet the power supply of different loads. Due to the use of the TLVR inductor, the above feedback circuit usually needs to be designed for the TLVR inductor, and the test verification is carried out after all the designs are completed. With the increasingly stringent design requirements, during the verification, regardless of whether there is a load, it is required that a certain voltage should be detected at the position of the output voltage to meet the power-on requirements of the power supply circuit. However, there is no feedback circuit in the prior art that can solve the problem of ensuring normal power-on of the system when the load does not exist. That is, when the load does not exist, the control module will usually directly control the switch module to turn off according to the voltage feedback signal, that is, trigger the overvoltage protection, resulting in the voltage at the output voltage position being 0. The whole process is very fast, and then the circuit cannot be powered on normally, which means that the design of the entire power supply circuit does not meet the requirements.

[0004] Therefore, it is necessary to find an effective way to solve the problem of normal power-on of the power supply circuit when the power supply circuit is not loaded. Summary of the invention

[0005] The object of the present invention is to provide a TLVR feedback circuit, a PCB board and a power supply circuit, such that when there is no load, the controller still controls the controllable switch in the power output module to conduct according to the voltage feedback signal received by its own feedback terminal to ensure power output, that is, overvoltage protection is not triggered, meeting the normal power-on requirements under no-load or light-load conditions and ensuring the normal operation of the entire power supply circuit.

[0006] To solve the above technical problems, the present invention provides a TLVR feedback circuit, including an adjustable resistor module, a TLVR_SENSE feedback module and a grounding resistor; the first end of the adjustable resistor module is connected to a DC power supply, the second end is respectively connected to the SENSE feedback terminal of the TLVR_SENSE feedback module and the DP feedback terminal of the controller, the third end is connected to the positive output terminal of the power output module and is also connected to the DP input terminal of the load when there is a load; the input terminal of the power output module is connected to a supply power source;

[0007] One end of the grounding resistor is respectively connected to the DN feedback terminal of the controller and the negative output terminal of the power output module and is also connected to the DN input terminal of the load when there is the load, and the other end is grounded;

[0008] The TLVR_SENSE feedback module is used for inductive coupling with the TLVR in the power output module; the adjustable resistor module is used to provide equivalent resistors with different resistance values, so that when the controller is under no-load or light-load conditions, it controls the controllable switch in the power output module to conduct according to the voltage feedback signal received by its own feedback terminal to ensure power output.

[0009] Preferably, the TLVR_SENSE feedback module includes a first resistor, a first capacitor, a coupling inductor, a second resistor and a second capacitor;

[0010] One end of the coupling inductor is connected to one end of the first resistor, and the other end is connected to one end of the first capacitor and then grounded, for inductive coupling with the TLVR inductor;

[0011] The second resistor and the second capacitor are in series, the other end of the first resistor is connected to the other end of the first capacitor and the common connection end is connected to one end of the series circuit, and the other end of the series circuit is respectively connected to the second end of the adjustable resistor module and the DP feedback terminal of the controller.

[0012] Preferably, the second resistor is a first adjustable resistor.

[0013] Preferably, the adjustable resistor module includes a third resistor and a second adjustable resistor;

[0014] One end of the second adjustable resistor serves as the first end of the adjustable resistor module. The second end of the second adjustable resistor is connected to one end of the third resistor, and the common connection end serves as the third end of the adjustable resistor module. The other end of the third resistor serves as the second end of the adjustable resistor module.

[0015] Preferably, it further includes:

[0016] A filtering module, with one end respectively connected to the SENSE feedback terminal of the TLVR_SENSE feedback module and the second end of the adjustable resistor module, and the other end connected to the DN feedback terminal of the controller, for filtering.

[0017] Preferably, the filtering module is a third capacitor. The capacitance value of the third capacitor is less than a preset threshold value, and the preset threshold value = R3 * C2 / (R2 + R3), where R3 is the resistance value of the third resistor, R2 is the resistance value of the second resistor, and C2 is the capacitance value of the second capacitor.

[0018] Preferably, it further includes:

[0019] A fourth resistor, with one end respectively connected to the second end of the adjustable resistor module and the SENSE feedback terminal of the TLVR_SENSE feedback module, and the other end connected to the DP feedback terminal of the controller.

[0020] To solve the above technical problems, the present invention also provides a PCB board, including a PCB board card body, and the TLVR feedback circuit as described above is provided on the PCB board card body;

[0021] The diameter distance between the first position of the first resistor in the TLVR feedback circuit on the PCB board card body and the second position of the coupling inductor in the TLVR feedback circuit on the PCB board card body is greater than the first preset interference noise elimination distance;

[0022] The diameter distance between the third position of the first capacitor in the TLVR feedback circuit on the PCB board card body and the second position of the coupling inductor in the TLVR feedback circuit on the PCB board card body is greater than the second preset interference noise elimination distance.

[0023] Preferably, ground wires are respectively provided on both sides of the preset wiring line on the PCB board card body;

[0024] The preset wiring route includes a connection line between the common terminal and one end of the series-connected circuit, and a connection line between the other end of the series-connected circuit and the DP feedback terminal of the controller in the TLVR feedback circuit. The connected common terminal is the common terminal where the first resistor and the first capacitor are connected, and the series-connected circuit is the circuit formed by the series connection of the second resistor and the second capacitor in the TLVR feedback circuit.

[0025] To solve the above technical problems, the present invention also provides a power supply circuit, which includes the TLVR feedback circuit as described above, and further includes:

[0026] A controller, connected to the TLVR feedback circuit;

[0027] A power output module, with its input end connected to the supply power, its output end connected to the TLVR feedback circuit and also connected to the load when there is a load, and its control end connected to the controller.

[0028] This application provides a TLVR feedback circuit, a PCB board, and a power supply circuit, including an adjustable resistor module, a TLVR_SENSE feedback module, and a grounding resistor. The first end of the adjustable resistor module is connected to the DC power supply, the second end is respectively connected to the SENSE feedback terminal of the TLVR_SENSE feedback module and the DP feedback terminal of the controller, and the third end is connected to the positive output end of the power output module and also connected to the DP input end of the load when there is a load; one end of the grounding resistor is respectively connected to the DN feedback terminal of the controller and the negative output end of the power output module and also connected to the DN input end of the load when there is a load, and the other end is grounded. Thus, the adjustable resistor module can provide equivalent resistors with different resistance values, changing the voltage feedback signal received by the controller. Furthermore, when there is no load, the controller still controls the controllable switch in the power output module to conduct according to the voltage feedback signal received by its own feedback terminal to ensure power output, that is, it will not trigger overvoltage protection, meeting the normal power-on requirements under no-load or light-load conditions and ensuring the normal operation of the entire power supply circuit. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the prior art and the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic structural diagram of a server power supply circuit design in the prior art;

[0031] Figure 2Schematic diagram of a TLVR feedback circuit provided by the present invention;

[0032] Figure 3 Schematic diagram of another TLVR feedback circuit provided by the present invention;

[0033] Figure 4 Schematic diagram of the display of a TLVR_SENSE signal provided by the present invention;

[0034] Figure 5 Schematic diagram of the display of another TLVR_SENSE signal provided by the present invention;

[0035] Figure 6 Schematic diagram of the display of the output voltage of a power output module provided by the present invention;

[0036] Figure 7 Schematic diagram of the display of another TLVR_SENSE signal provided by the present invention;

[0037] Figure 8 Schematic diagram of the display of another TLVR_SENSE signal provided by the present invention;

[0038] Figure 9 Schematic diagram of the placement and wiring of physical devices on the PCB board body provided by the present invention;

[0039] Figure 10 Schematic diagram of the placement and wiring of physical devices on another PCB board body provided by the present invention;

[0040] Figure 11 Schematic diagram of the structure of a power supply circuit provided by the present invention. Detailed implementation manners

[0041] The core of the present invention is to provide a TLVR feedback circuit, a PCB board and a power supply circuit, so that when the load does not exist, the controller still controls the controllable switch in the power output module to conduct according to the voltage feedback signal received by its own feedback terminal to ensure power output, that is, overvoltage protection will not be triggered, meeting the normal power-on requirements under no-load or light-load conditions and ensuring the normal operation of the entire power supply circuit.

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of a server power supply circuit design in the prior art; Figure 2 which is a schematic structural diagram of a TLVR feedback circuit provided by the present invention.

[0044] The TLVR feedback circuit includes an adjustable resistor module 2, a TLVR_SENSE feedback module 1, and a grounding resistor 3; the first end of the adjustable resistor module 2 is connected to a DC power supply, the second end is respectively connected to the SENSE feedback end of the TLVR_SENSE feedback module 1 and the DP feedback end of the controller, and the third end is connected to the positive output end of the power output module and is also connected to the DP input end of the load when there is a load; the input end of the power output module is connected to a supply power supply;

[0045] One end of the grounding resistor 3 is respectively connected to the DN feedback end of the controller and the negative output end of the power output module and is also connected to the DN input end of the load when there is a load, and the other end is grounded;

[0046] The TLVR_SENSE feedback module 1 is used for inductive coupling with the TLVR in the power output module; the adjustable resistor module 2 is used to provide equivalent resistors with different resistance values, so that the controller can control the conduction of the controllable switch in the power output module according to the voltage feedback signal received at its own feedback end when there is no load or a light load to ensure power output.

[0047] In this embodiment, considering the server power supply circuit applying the TLVR inductor in the prior art, usually as Figure 1 shown, the input voltage of the power supply passes through a switch module, a TLVR inductor, and a filter circuit in sequence to obtain an output voltage, and this output voltage is used to supply power to the load. Further considering that the power supply requirements of different loads are different and the load weight also varies, it is necessary to design a feedback circuit to collect the voltage feedback signal to the controller. The controller controls the conduction and cut-off of the switch tube in the switch module and the corresponding action duration according to this voltage feedback signal to meet the power supply for different loads. However, with the complexity of server design, in the power supply circuit design, it is required that regardless of whether there is a load, a certain voltage (i.e., the voltage is not 0) should be detected at the position of the output voltage to meet the power-on requirement of the power supply circuit. However, there is no effective way in the prior art to solve the problem of normal power-on of the power supply circuit when there is no load (i.e., the load is not installed). To solve the above technical problems, the present application provides a TLVR feedback circuit, which can meet the normal power-on requirement when there is no load or a light load and ensure the normal operation of the entire power supply circuit.

[0048] First of all, it should be noted that the TLVR feedback circuit can be applied to the power supply circuit of an electronic device, and the electronic device includes but is not limited to a server. The power output module specifically includes a switching module, a TLVR inductor, and a filtering circuit. Among them, the switching module includes a plurality of controllable switches controlled by a controller. The TLVR inductor is coupled to the TLVR_SENSE feedback module 1 in the TLVR feedback circuit provided by the present application. The filtering circuit usually includes a filtering capacitor. The supply power and the DC power are not the same, and the supply power specifically provides electrical energy for the entire power supply circuit. The controller can control the conduction and cut-off of the controllable switches in the switching module, as well as the specific duration of conduction and cut-off, according to the voltage feedback signal of the TLVR feedback circuit received at its input end, so as to control the electrical energy output of the power output module.

[0049] Specifically, please refer to Figure 2 , Figure 2 which is a schematic structural diagram of a TLVR feedback circuit provided by the present invention. Among them, taking the existence of a load as an example, the connection of the TLVR feedback circuit is illustrated, and it is assumed that the load is a CPU for explanation. In addition, the existence of a load mentioned in the present application means that there is a powered device at the location of the CPU, and the non-existence of a load means that there is no powered device at the location of the CPU, which is manifested as an open circuit, that is, no load. When there is no load or a light load (the light load can be the load state when the CPU is just powered on but not yet in the normal working state), in order to prevent the output voltage at the output end of the power output module from being too large and triggering the overvoltage protection logic inside the controller (that is, controlling all the controllable switches to turn off to cut off the power output), the resistance value of the adjustable resistor module 2 provided by the present application can be adjusted to realize the adjustment of the resistance value of the corresponding equivalent resistor, and then change the voltage feedback signal input to the controller (combining Figure 2 it can be seen that there are two paths of feedback signals in this feedback circuit. One path is the TLVR_SENSE signal from the SENSE feedback terminal of the TLVR_SENSE feedback module 1, and the other path is the ordinary SENSE signal from the second terminal of the adjustable resistor module 2 and the grounding resistor 3. Here, it is assumed that this path of feedback signal is named the VCCIN_SENSE signal, and changing the equivalent resistance value of the adjustable resistor module 2 changes this path of VCCIN_SENSE signal), so that when there is no load or a light load, the controller controls the controllable switches in the power output module to remain conducting according to the voltage feedback signal received at its feedback terminal to ensure power output, that is, not to trigger the internal overvoltage protection logic.

[0050] In summary, the present application provides a TLVR feedback circuit. The adjustable resistor module 2 can provide equivalent resistors with different resistance values, changing the voltage feedback signal received by the controller. As a result, when the load is absent, the controller still controls the controllable switch in the power output module to conduct according to the voltage feedback signal received at its own feedback terminal to ensure power output, that is, overvoltage protection will not be triggered, meeting the normal power-on requirements under no-load or light-load conditions and ensuring the normal operation of the entire power supply circuit.

[0051] Based on the above embodiments:

[0052] As a preferred embodiment, the TLVR_SENSE feedback module 1 includes a first resistor R1, a first capacitor C1, a coupling inductor L1, a second resistor R2, and a second capacitor C2;

[0053] One end of the coupling inductor L1 is connected to one end of the first resistor R1, and the other end is connected to one end of the first capacitor C1 and then grounded, for inductive coupling with the TLVR inductor;

[0054] The second resistor R2 and the second capacitor C2 are connected in series. The other end of the first resistor R1 is connected to the other end of the first capacitor C1, and the common connection end is connected to one end of the series circuit. The other end of the series circuit is respectively connected to the second end of the adjustable resistor module 2 and the DP feedback terminal of the controller.

[0055] In this embodiment, the specific structure of the TLVR_SENSE feedback module 1 is given, that is, it includes a first resistor R1, a first capacitor C1, a coupling inductor L1, a second resistor R2, and a second capacitor C2. The specific connection method is as described above and will not be elaborated here. More specifically, please refer to Figure 3 , Figure 3 which is a schematic diagram of the structure of another TLVR feedback circuit provided by the present invention. Among them, limited by the picture display space and display focus, the connection of this TLVR feedback circuit is still illustrated taking the presence of a load as an example, and it is assumed that the load is a CPU for illustration.

[0056] As a first preferred parameter setting example, the relevant parameters of the first resistor R1 can be: resistance value of 200 ohms, accuracy of 1%, and packaging method of 0402; the relevant parameters of the second resistor R2 can be: resistance value of 130 ohms, accuracy of 1%, and packaging method of 0402; the relevant parameters of the first capacitor C1 can be: capacitance value of 0.022 μF, withstand voltage of 25V, and packaging method of 0402; the relevant parameters of the second capacitor C2 can be: capacitance value of 0.47 μF, withstand voltage of 16V, and packaging method of 0402.

[0057] It can be seen that the circuit design of the TLVR_SENSE feedback module 1 can be simply and reliably realized through the above method. In addition, the TLVR_SENSE feedback module 1 described above may further include other circuit devices, but the overall framework structure is equivalent to the above settings.

[0058] As a preferred embodiment, the second resistor R2 is a first adjustable resistor.

[0059] In this embodiment, it is assumed that the feedback signal flowing through the TLVR_SENSE feedback module 1 and flowing out from its SENSE feedback terminal is defined as the TLVR_SENSE signal here. Then, the inventor further discovers that according to the setting method of the above TLVR_SENSE feedback module 1, there is an obvious ringing phenomenon on the SENSE signal. Please refer to Figure 4 , Figure 4 which is a display schematic diagram of a TLVR_SENSE signal provided by the present invention. Among them, this Figure 4 is the actual measurement display schematic diagram of the oscilloscope TLVR_SENSE signal obtained by conducting experiments according to the first preferred parameter setting example above. The waveform corresponding to the VCCIN signal is the waveform corresponding to the output voltage of the DC power supply (i.e., the waveform sampled at point b), and the waveform corresponding to the TLVR_SENSE is the waveform of the TLVR_SENSE signal without ringing reduction processing (i.e., the waveform sampled at point a). It can be seen that there is indeed a large ringing phenomenon, which will affect the operation of the controller, resulting in deviation in the control of the controllable switch of the power output module, and in severe cases, the device will be burned out. Therefore, it can be seen that there is room for optimization in the above TLVR_SENSE feedback module 1 and the first preferred parameter setting example. Specifically, this embodiment provides a further optimization method. The second resistor R2 can be set as a first adjustable resistor, and then the resistance value of the first adjustable resistor can be adjusted to achieve ringing reduction. The specific resistance value adjustment depends on the actual requirements and the obtained actual measurement results. Correspondingly, a second preferred parameter setting example is given. On the basis of the first preferred parameter setting example (i.e., retaining the parameter settings of the first resistor R1, the first capacitor C1, and the second capacitor C2), after actual measurement and debugging of the second resistor R2, it is found that increasing the resistance value of the second resistor R2 on the basis of its original resistance value of 130 ohms can reduce ringing. However, it is also found in actual measurement that excessive adjustment will cause an increase in ringing. Finally, through actual measurement, it is found that when the resistance value of the second resistor R2 reaches 200 ohms, the effect is the best and the ringing phenomenon is optimized. Please refer to Figure 5 , Figure 5Another display schematic diagram of the TLVR_SENSE signal provided by the present invention. Among them, the waveform corresponding to the VCCIN signal is the waveform corresponding to the output voltage of the DC power supply (i.e., the waveform sampled at point b), and the waveform corresponding to the TLVR_SENSE is the waveform of the TLVR_SENSE signal after the ringing reduction process according to the second preferred parameter setting example above (i.e., the waveform sampled at point a). It can be seen that the ringing part has indeed been reduced to a certain extent, achieving the expected effect.

[0060] As a preferred embodiment, the adjustable resistor module 2 includes a third resistor R3 and a second adjustable resistor R5;

[0061] One end of the second adjustable resistor R5 serves as the first end of the adjustable resistor module 2, the second end of the second adjustable resistor R5 is connected to one end of the third resistor R3, and the common connection end is used as the third end of the adjustable resistor module 2. The other end of the third resistor R3 serves as the second end of the adjustable resistor module 2.

[0062] In this embodiment, it is given that the adjustable resistor specifically includes a third resistor R3 and a second adjustable resistor R5. The specific connection structure is as described above and will not be elaborated here. It should also be noted that the TLVR feedback circuit may further include a seventh resistor R7 to provide a placeholder. One end of the seventh resistor R7 is connected to the third end of the adjustable resistor module 2, and the other end of the seventh resistor R7 is connected to the output positive end of the power output module and is also connected to the DP input end of the load when there is a load. See specifically Figure 3 as shown, and the seventh resistor R7 includes but is not limited to a zero-ohm resistor with a resistance value of 0. For example, the specific relevant parameters of the seventh resistor R7 are: resistance value of 0 ohms, accuracy of 5%, and package type of 0402.

[0063] In addition, it should also be noted that the TLVR feedback circuit may further include a fifth resistor R4 and an eighth resistor R8 to provide a placeholder. One end of the fifth resistor R4 is connected to the DN feedback end of the controller, the other end of the fifth resistor R4 is connected to one end of the grounding resistor 3, and the common connection end is connected to one end of the eighth resistor R8. The other end of the eighth resistor R8 is connected to the output negative end of the power output module and is also connected to the DN input end of the load when there is the load. The specific connection diagram is shown in Figure 3 as shown in, and both the fifth resistor R4 and the eighth resistor R8 include but are not limited to zero-ohm resistors with a resistance value of 0. For example, the specific relevant parameters of the fifth resistor R4 are: resistance value of 0 ohms, accuracy of 5%, and package type of 0402; for example, the specific relevant parameters of the eighth resistor R8 are: resistance value of 0 ohms, accuracy of 5%, and package type of 0402.

[0064] So far, combined withFigure 3 , the following is the derivation of the principle that the normal power-on of the power supply circuit can be achieved by adjusting the resistance value of the second adjustable resistor R5 under no-load conditions:

[0065] For the case where there is a load as Figure 3 shown (i.e., the CPU exists), the gain of the TLVR SENSE signal after passing through the entire control loop is:

[0066] Gsense1 = (R3 + R7) / (R2 + R3 + R7);

[0067] And for the case where there is no load and it is no-load (i.e., the CPU does not exist), the gain of the TLVR SENSE signal after passing through the entire control loop is:

[0068] Gsense2 = (R3 + R5) / (R2 + R3 + R5);

[0069] It can be understood that the location of the load is at a certain distance from the location of the controller. Therefore, it can be understood that the location of the load is the far end relative to the location of the controller. Therefore, both the seventh resistor R7 and the eighth resistor R8 are equivalent to the resistors at the far end. When there is no load, this part of the resistor is not connected and is equivalent to an open circuit. Combining the above formula of Gsense2, it can be seen that when the second adjustable resistor R5 is set too large, it will cause the gain to be too large, and the excessive gain will cause the controller to trigger the internal overvoltage protection logic. Therefore, a third preferred parameter setting example is given. On the basis of the second preferred parameter setting example (i.e., retaining the parameter settings of the first resistor R1, the first capacitor C1, the first adjustable resistor, and the second capacitor C2), the specific relevant parameters of the third resistor R3 are: the resistance value is 20 ohms, the accuracy is 5%, and the packaging method is 0402. The specific relevant parameters of the second adjustable resistor R5 are: the resistance value is 20 ohms, the accuracy is 1%, and the packaging method is 0402. Please refer to Figure 6 , Figure 6 is a schematic diagram showing the output voltage of a power output module provided by the present invention. Among them, this Figure 6 is obtained by actual measurement according to the above third preferred parameter setting example. The first signal with a slope above is the display signal of the output voltage of the power output module on the oscilloscope. It can be seen that the output voltage climbs from 0 to a certain voltage value, and the output voltage is normal, solving the problem that the design does not meet the requirements due to triggering the internal overvoltage protection; the straight line below is the display signal of the output current of the power output module on the oscilloscope.

[0070] As a preferred embodiment, it further includes:

[0071] The filtering module is connected at one end to the SENSE feedback terminal of the TLVR_SENSE feedback module 1 and the second terminal of the adjustable resistor module 2 respectively, and at the other end to the DN feedback terminal of the controller, and is used for filtering.

[0072] In this embodiment, the inventor found in actual tests that in addition to the ringing phenomenon, the TLVR_SENSE signal described in the above embodiment also has noise interference spikes, which will also affect the operation of the controller, causing deviation in the control of the controllable switch of the power output module by the controller. Specifically, please refer to Figure 7 , Figure 7 is a schematic diagram showing another TLVR_SENSE signal provided by the present invention. The Figure 7 is the measured display schematic diagram of the oscilloscope TLVR_SENSE signal obtained by conducting experiments according to the first preferred parameter setting example. The waveform corresponding to the VCCIN signal is the waveform corresponding to the output voltage of the DC power supply (i.e., the waveform sampled at point b), and the waveform corresponding to the TLVR_SENSE is the waveform of the TLVR_SENSE signal without noise interference processing and without ringing reduction processing (i.e., the waveform sampled at point a). It can be seen that there are obvious ringing phenomena and many noise interference spikes; therefore, there is still room for further optimization of the TLVR feedback circuit and the above-mentioned third preferred parameter setting example. Thus, a filtering module is provided to filter out the above-mentioned noise interference and improve the anti-interference ability. The specific installation position of the filtering module is as described above and will not be elaborated here.

[0073] As a preferred embodiment, the filtering module is the third capacitor C3, and the capacitance value of the third capacitor C3 is less than the preset threshold, where the preset threshold = R3 * C2 / (R2 + R3), where R3 is the resistance value of the third resistor R3, R2 is the resistance value of the second resistor R2, and C2 is the capacitance value of the second capacitor C2.

[0074] In this embodiment, it is given that the filtering module is specifically the third capacitor C3, and the specific capacitance value setting method of the third capacitor C3 is given. It should be noted that when substituting each resistor and capacitor in the preset threshold into the formula for calculation, it is only necessary to calculate using, including but not limited to, standard international units; thus, a fourth preferred parameter setting example is given, that is, on the basis of the third preferred parameter setting example (i.e., retaining the parameter settings of the first resistor R1, the first capacitor C1, the first adjustable resistor, the second capacitor C2, the third resistor R3, and the second adjustable resistor R5), the specific relevant parameters of the third capacitor C3 are: the capacitance value is 3300 picofarads, the withstand voltage is 50V, and the package type is 0402. Please refer to Figure 8 , Figure 8 is a schematic diagram showing another TLVR_SENSE signal provided by the present invention. TheFigure 8 This is the measured display schematic diagram of the oscilloscope TLVR_SENSE signal obtained by conducting experiments according to the fourth preferred parameter setting example. The waveform corresponding to the VCCIN signal is the waveform corresponding to the output voltage of the DC power supply (i.e., the waveform sampled at point b), and the waveform corresponding to the TLVR_SENSE is the waveform of the TLVR_SENSE signal after noise interference processing and ringing reduction processing (i.e., the waveform sampled at point a). It can be seen that both the noise interference and the ringing phenomenon are significantly suppressed, and the actual measurement proves the working reliability of the feedback circuit of the present application.

[0075] As a preferred embodiment, it further includes:

[0076] The fourth resistor R6, one end of which is respectively connected to the second end of the adjustable resistor module 2 and the SENSE feedback end of the TLVR_SENSE feedback module 1, and the other end is connected to the DP feedback end of the controller.

[0077] In this embodiment, it is given that the TLVR feedback circuit may further include the fourth resistor R6 to provide a placeholder for subsequent debugging. For the specific connection method, please refer to Figure 3 and the above text description, which will not be elaborated here. To further enrich the fourth preferred parameter setting example, the fourth resistor R6 includes but is not limited to a zero-ohm resistor with a resistance value of 0. For example, the specific relevant parameters of the fourth resistor R6 are: a resistance value of 0 ohms, an accuracy of 1%, and a packaging method of 0603.

[0078] The present invention also provides a PCB board, including a PCB board card body, on which the above-mentioned TLVR feedback circuit is provided;

[0079] The diameter distance between the first position of the first resistor R1 in the TLVR feedback circuit on the PCB board card body and the second position of the coupling inductor L1 in the TLVR feedback circuit on the PCB board card body is greater than the first preset interference noise elimination distance;

[0080] The diameter distance between the third position of the first capacitor C1 in the TLVR feedback circuit on the PCB board card body and the second position of the coupling inductor L1 in the TLVR feedback circuit on the PCB board card body is greater than the second preset interference noise elimination distance.

[0081] In this embodiment, for the introduction of the PCB board provided by the present invention, please refer to the above-mentioned embodiment of the TLVR feedback circuit, which will not be elaborated here.

[0082] It should be noted that the inventor further found that when the above-mentioned TLVR feedback circuit is actually placed on the PCB board card body, there is also room for optimization in the specific placement method of the devices and the signal routing. Please first refer to Figure 9 ,Figure 9 This is a schematic diagram of the placement and routing of physical devices on a PCB board body provided by the present invention. The coupling inductor L1 is placed close to the TLVR inductor 4 to achieve coupling. Assuming that the signal traces in the TLVR_SENSE feedback module 1 are all defined as TLVR_SENSE traces, then the single-ended signal synthesized after passing through the first resistor R1 and the first capacitor C1 (that is, the other end of the first resistor R1 is connected to the other end of the first capacitor C1, and the common terminal obtained by the connection is routed backward as a single-ended signal), that is, the TLVR_SENSE trace signal corresponding to the TLVR_SENSE trace ( Figure 9 In the figure, the TLVR_SENSE trace signal is marked with the reference numeral 5), for this single-ended signal, it is relatively clean and free of interference. However, the inductor is a high-noise device. According to the Figure 9 placement method shown in the figure, then this single-ended signal still inevitably has to bypass the coupling inductor L1, and its noise will immediately couple into the single-ended signal. Then this noise will surely affect the operation of the subsequent controller and affect the control accuracy. It should also be noted that, Figure 9 In the figure, the trace of the above single-ended signal (that is, the TLVR_SENSE trace signal) is schematically shown as a line with a dark gray and light gray alternating pattern and marked with the reference numeral 5. And due to the limitation of the key points shown in the picture, the connection between the above single-ended signal and the second resistor R2 and the subsequent connections are not shown as key points.

[0083] Therefore, in the present application, the first resistor R1 and the first capacitor C1 are placed at a position far from the coupling inductor L1, that is: the diameter distance between the first position of the first resistor R1 on the PCB board body and the second position of the coupling inductor L1 on the PCB board body is greater than the first preset interference noise cancellation distance. The first preset interference noise cancellation distance includes but is not limited to 600 mils. In addition, the diameter distance described in the present application is not the actual trace distance between the two, because there may be wire-wrapping situations during the routing process due to the placement of devices. Therefore, the diameter distance here essentially refers to the distance between the center point of the first position where the first resistor R1 is located and the center point of the second position where the coupling inductor L1 is located; similarly, the diameter distance between the third position of the first capacitor C1 on the PCB board body and the second position of the coupling inductor L1 on the PCB board body is greater than the second preset interference noise cancellation distance. The second preset interference noise cancellation distance includes but is not limited to 600 mils, and no special limitation is made here. It can be set according to the actual routing requirements and the device placement situation, and it is not necessary to place the distance too far to avoid affecting the working performance of other devices on the PCB board. Specifically, please refer to Figure 10 , Figure 10 This is another schematic diagram of the placement and routing of physical devices on a PCB board body provided by the present invention, corresponding to Figure 9 , Figure 10It shows a schematic diagram after optimizing the placement positions of the above-mentioned first resistor R1 and first capacitor C1. Then, the influence generated by the inductance noise will be eliminated after passing through the first resistor R1 and the first capacitor C1.

[0084] As a preferred embodiment, in the fourth preferred parameter setting example, the package type corresponding to the first resistor R1 is 0402, and this package type can be further optimized to 0805. It can be understood that although the resistance value of the first resistor R1 itself does not change when the package size becomes larger, after the package size becomes larger, it can better resist the noise interference brought by the inductance and has stronger tolerance.

[0085] As a preferred embodiment, ground wires are separately provided on both sides of the preset wiring line on the PCB board body;

[0086] The preset wiring line includes a connection line between the common terminal and one end of the series-connected circuit, and a connection line between the other end of the series-connected circuit and the DP feedback terminal of the controller in the TLVR feedback circuit. The connected common terminal is the common terminal where the first resistor R1 and the first capacitor C1 are connected, and the series-connected circuit is the circuit after the second resistor R2 and the second capacitor C2 in the TLVR feedback circuit are connected in series.

[0087] In this embodiment, the inventor further considered that there are also other devices on the PCB board. Specifically, please continue to refer to Figure 9 As shown, the single-ended signal after passing through the first resistor R1 and the first capacitor C1 reaches the DP feedback terminal of the controller through the second resistor R2 and the second capacitor C2 without any protection. Therefore, it is essentially a wiring method without anti-interference design, and this method is likely to be affected by other devices on the way and introduce noise, thereby affecting the operation of the controller. For this reason, this application also separately provides ground wires on both sides of the preset wiring line on the PCB board body. The specific distance between the ground wires provided on both sides and the preset wiring line can be set according to actual needs. And the preset wiring line can include a connection line between the common terminal and one end of the series-connected circuit, can include a connection line between the other end of the series-connected circuit and the DP feedback terminal of the controller in the TLVR feedback circuit, and of course can also include the connection line between the second resistor R2 and the second capacitor C2. Specifically, please refer to Figure 10 , Figure 10 In

[0088] It can be understood that the above design can well isolate the single-ended signal trace from the interference generated by other devices to ensure that the signal is not affected by noise. In addition, if there is a need to change the signal to an inner-layer trace, it can be processed in the same way as laying the ground wire described above.

[0089] As can be seen from all the above embodiments, the optimization of the TLVR feedback circuit provided by the present application and the distance setting method on the PCB board body can provide a more accurate feedback input for the controller, with higher final control accuracy, improving the design quality and reliability of the power supply circuit of the electronic device.

[0090] Please refer to Figure 11 , Figure 11 which is a schematic structural diagram of a power supply circuit provided by the present invention.

[0091] The power supply circuit includes the TLVR feedback circuit 6 as described above, and further includes:

[0092] A controller 7, connected to the TLVR feedback circuit 6;

[0093] A power output module 8, with its input end connected to the supply power, its output end connected to the TLVR feedback circuit 6 and also connected to the load when there is a load, and its control end connected to the controller 7.

[0094] For the introduction of the power supply circuit provided by the present invention, please refer to the embodiments of the TLVR feedback circuit above, and details will not be repeated here.

[0095] It should also be noted that the power supply circuit can be applied to various electronic devices, and the electronic devices include but are not limited to servers.

[0096] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0097] It should also be noted that in this specification, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising said element. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A TLVR feedback circuit, characterized in that, It includes an adjustable resistor module, a TLVR_SENSE feedback module, and a grounding resistor; the first end of the adjustable resistor module is connected to a DC power supply, the second end is respectively connected to the SENSE feedback terminal of the TLVR_SENSE feedback module and the DP feedback terminal of the controller, and the third end is connected to the positive output terminal of the power output module and is also connected to the DP input terminal of the load when there is a load; the input terminal of the power output module is connected to a supply power supply; One end of the grounding resistor is respectively connected to the DN feedback terminal of the controller and the negative output terminal of the power output module and is also connected to the DN input terminal of the load when there is the load, and the other end is grounded; The TLVR_SENSE feedback module is used to be inductively coupled with the TLVR in the power output module; the adjustable resistor module is used to provide equivalent resistors with different resistance values, so that when the controller is in no-load or light-load conditions, it controls the controllable switch in the power output module to conduct according to the voltage feedback signal received at its own feedback terminal to ensure power output.

2. The TLVR feedback circuit according to claim 1, wherein The TLVR_SENSE feedback module includes a first resistor, a first capacitor, a coupling inductor, a second resistor, and a second capacitor; One end of the coupling inductor is connected to one end of the first resistor, and the other end is connected to one end of the first capacitor and then grounded, and is used to be inductively coupled with the TLVR inductor; The second resistor and the second capacitor are connected in series. The other end of the first resistor is connected to the other end of the first capacitor, and the common connection end is connected to one end of the series circuit. The other end of the series circuit is respectively connected to the second end of the adjustable resistor module and the DP feedback terminal of the controller.

3. The TLVR feedback circuit according to claim 2, wherein The second resistor is a first adjustable resistor.

4. The TLVR feedback circuit according to claim 2, wherein The adjustable resistor module includes a third resistor and a second adjustable resistor; One end of the second adjustable resistor is used as the first end of the adjustable resistor module, the second end of the second adjustable resistor is connected to one end of the third resistor, and the common connection end is used as the third end of the adjustable resistor module. The other end of the third resistor is used as the second end of the adjustable resistor module.

5. The TLVR feedback circuit according to claim 4, wherein It further includes: A filtering module, one end of which is respectively connected to the SENSE feedback terminal of the TLVR_SENSE feedback module and the second end of the adjustable resistor module, and the other end is connected to the DN feedback terminal of the controller, and is used for filtering.

6. The TLVR feedback circuit according to claim 5, wherein The filtering module is a third capacitor, and the capacitance value of the third capacitor is less than a preset threshold value, and the preset threshold value = R3 * C2 / (R2 + R3), where R3 is the resistance value of the third resistor, R2 is the resistance value of the second resistor, and C2 is the capacitance value of the second capacitor.

7. The TLVR feedback circuit according to any one of claims 1 to 6, characterized in that, It further includes: A fourth resistor, one end of which is respectively connected to the second end of the adjustable resistor module and the SENSE feedback terminal of the TLVR_SENSE feedback module, and the other end is connected to the DP feedback terminal of the controller.

8. A PCB board, characterized in that, It includes a PCB board body, and the TLVR feedback circuit according to any one of claims 2 to 6 is provided on the PCB board body; The diameter distance between the first position of the first resistor in the TLVR feedback circuit on the PCB board body and the second position of the coupling inductor in the TLVR feedback circuit on the PCB board body is greater than the first preset interference noise cancellation distance; The diameter distance between the third position of the first capacitor in the TLVR feedback circuit on the PCB board body and the second position of the coupling inductor in the TLVR feedback circuit on the PCB board body is greater than the second preset interference noise cancellation distance.

9. The PCB board according to claim 8, characterized in that, Ground wires are also separately provided on both sides of the preset wiring line on the PCB board body; The preset wiring line includes a connection line between the common terminal of the connection and one end of the series-connected circuit, and a connection line between the other end of the series-connected circuit and the DP feedback terminal of the controller in the TLVR feedback circuit. The common terminal of the connection is the common terminal to which the first resistor and the first capacitor are connected, and the series-connected circuit is the circuit after the second resistor and the second capacitor in the TLVR feedback circuit are connected in series.

10. A power supply circuit, characterized in that, Comprising the TLVR feedback circuit according to any one of claims 1 to 7, further comprising: A controller, connected to the TLVR feedback circuit; A power output module, with an input terminal connected to a supply power source, an output terminal connected to the TLVR feedback circuit and also connected to the load when there is a load, and a control terminal connected to the controller.

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