CN103391004B - Intermediate bus architecture voltage-regulating circuit - Google Patents

Abstract

An embodiment of the present invention provides an IBA voltage adjustment circuit. The IBA voltage adjustment circuit includes: a DC voltage input terminal, a DC voltage output terminal, and N voltage adjustment circuits. Each voltage adjustment circuit includes a switch tube, an autotransformer, and a rectifier filter circuit, wherein the input end of the switching tube is coupled to the DC voltage input end, the output end of the switching tube is coupled to the input tap of the autotransformer, and the output tap of the autotransformer is coupled to the input end of the rectification and filtering circuit , the output end of the rectification filter circuit is coupled to the DC voltage output end; N is a positive integer. The above technical solution helps to reduce the cost of the voltage adjustment circuit.

Description

Intermediate bus architecture voltage regulation circuit

technical field

The present invention relates to communication technology, in particular to an intermediate bus architecture (Intermediate Bus Architecture, IBA) voltage adjustment circuit.

Background technique

Fig. 1a, Fig. 1b and Fig. 1c are respectively schematic diagrams of three DC power distribution methods existing in communication equipment provided by the prior art. The communication device may be a router or a switch. FIG. 2 is a schematic diagram of a power architecture provided in the prior art in a sub-hardware unit in a communication device. The sub-hardware unit may be a line interface processing unit (line interface processing unit, LPU) or a switching fabric unit (switch fabric unit, SFU). As shown in Figure 1a, the power distribution mode is a straight-through power distribution mode, and the power distribution bus is directly connected to the sub-hardware unit in the communication device. As shown in Figure 1b, the power distribution method is an isolated voltage regulation type, and the power distribution bus is connected to the sub-hardware unit in the communication device after a first-level isolation type voltage regulation module. As shown in Figure 1c, this power distribution mode is a non-isolated voltage regulation type, and the difference from the power distribution mode shown in Figure 1b is that the voltage regulation module is a non-isolated type. In addition, as shown in Figure 2, the power architecture of the sub-hardware unit in the communication device is specifically IBA. The voltage required by the low-voltage load is converted by a Point of Load (POL) voltage regulation module.

FIG. 3 is a schematic diagram of an isolated switching power supply topology adopted by the above-mentioned IBA voltage regulating module in the prior art. As shown in FIG. 3 , the above-mentioned IBA voltage regulation module is a closed-loop module. The reference potential of the input tap of the transformer in the IBA voltage regulating module is different from the reference potential of the output tap. The reference potential of the input tap may be a higher potential (eg 1000 volts) or a lower reference potential (eg -1000 volts). This makes it necessary to input a higher potential (such as 1100 volts) or a lower potential (such as -990 volts) to the control terminal of the switch tube to control the on-off of the switch tube. Providing higher potential or lower potential requires the use of drive windings, drive transformers or specific driver chips. The above increases the cost of the voltage regulation circuit.

Contents of the invention

An embodiment of the present invention provides an IBA voltage adjustment circuit, which helps reduce the cost of the voltage adjustment circuit.

In the first aspect, an IBA voltage adjustment circuit is provided, including:

A DC voltage input terminal, a DC voltage output terminal, and N voltage adjustment circuits, each voltage adjustment circuit includes a switch tube, an autotransformer, and a rectification filter circuit, wherein the input end of the switch tube is coupled to the DC voltage input end , the output end of the switch tube is coupled to the input tap of the autotransformer, the output tap of the autotransformer is coupled to the input end of the rectification filter circuit, and the output end of the rectification filter circuit is coupled to the DC The voltage output terminal is coupled; N is a positive integer.

In the first possible implementation of the first aspect, the N voltage adjustment circuits include N/2 groups of voltage adjustment circuits, each group of voltage adjustment circuits includes two voltage adjustment circuits, and the two voltage adjustment circuits are The first voltage adjustment circuit and the second voltage adjustment circuit, the first voltage adjustment circuit and the second voltage adjustment circuit share a magnetic core, the autotransformer in the first voltage adjustment circuit and the second voltage adjustment circuit The polarity of the same-named terminal of the autotransformer in the adjustment circuit is opposite; wherein, N is specifically an even number.

With reference to the first possible implementation of the first aspect, in the second possible implementation of the first aspect, N of the N/2 first voltage adjustment circuits in the N/2 groups of voltage adjustment circuits The working phases of the /2 switch tubes are within the range of 0° to 180°, and the difference between the working phases of the two switch tubes with adjacent working phases is 360°/N, and each of the N/2 groups of voltage adjustment circuits The working phase difference of the two switch tubes in the group voltage adjustment circuit is 180 degrees.

With reference to the first aspect, in a third possible implementation manner of the first aspect, the N autotransformers in the N voltage adjustment circuits include N magnetic cores, and the N autotransformers and the N There is a one-to-one correspondence between the magnetic cores, and the topology of the IBA voltage adjustment circuit is a forward topology.

In combination with the third possible implementation of the first aspect, in the fourth possible implementation of the first aspect, the working phases of the N switching tubes in the N voltage adjustment circuits are located between 0 degrees and 360 degrees. Within the range, the difference between the working phases of two switching tubes with adjacent working phases is 360 degrees/N.

Combining the first aspect, the first possible implementation of the first aspect to the fourth possible implementation of the first aspect, in the fifth possible implementation of the first aspect, the N voltages are adjusted The output transformation ratio of each of the N autotransformers in the circuit is K:1, and K is greater than or equal to 3 and less than or equal to 6.5.

Combining the first aspect, the first possible implementation manner of the first aspect to the fifth possible implementation manner of the first aspect, in the sixth possible implementation manner of the first aspect, it further includes point-of-load power supply POL regulation A voltage module and a load, the DC voltage output terminal is coupled to the input terminal of the POL voltage regulation module, and the output terminal of the POL voltage regulation module is coupled to the input terminal of the load.

Combining the first aspect, the first possible implementation manner of the first aspect to the sixth possible implementation manner of the first aspect, in the seventh possible implementation manner of the first aspect, an isolated stable A piezoelectric power supply, the input terminal of the isolated regulated power supply is coupled to the DC voltage input terminal.

Combining the first aspect, the first possible implementation manner of the first aspect to the seventh possible implementation manner of the first aspect, in the eighth possible implementation manner of the first aspect, a driver is further included, and the The driver is used to control the on-off of the switch tube through the control terminal of the switch tube, and the N reference potentials of the N autotransformers in the N voltage adjustment circuits are the same as the reference potential of the driver reference potential.

With reference to the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner of the first aspect, the switch transistor is a metal oxide semiconductor field effect transistor, a bipolar transistor, or a thyristor.

In the above technical solution, the IBA voltage adjustment circuit includes an autotransformer, and the reference potential of the input tap of the autotransformer and the reference potential of the output tap are the same reference potential. The reference potential of the input tap may be 0 volts. The on-off of the switch tube can be controlled by inputting a potential slightly greater than 0 volts to the control terminal of the switch tube. Therefore, the above technical solution provides that the IBA voltage adjustment circuit does not need to use a driving winding, a driving transformer or a special driving chip, which helps to reduce the cost.

Description of drawings

Fig. 1a, Fig. 1b and Fig. 1c are respectively schematic diagrams of three DC power distribution methods existing in communication equipment provided by the prior art;

FIG. 2 is a schematic diagram of a power supply architecture existing in a sub-hardware unit in a communication device provided by the prior art;

FIG. 3 is a schematic diagram of an isolated switching power supply topology adopted by the above-mentioned IBA voltage regulation module in the prior art;

FIG. 4 is a schematic structural diagram of an IBA voltage adjustment circuit provided by an embodiment of the present invention;

5 is a schematic structural diagram of another IBA voltage adjustment circuit provided by an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of another IBA voltage adjustment circuit provided by an embodiment of the present invention.

detailed description

In the prior art, the reference potential of the input tap of the transformer is different from the reference potential of the output tap. The reference potential of the input tap may be a higher potential (such as 1000 volts) or a lower reference potential (such as -1000 volts), which makes it necessary to input a higher potential (such as 1100 volts) or a lower potential to the control terminal of the switch tube. A low potential (for example -990 volts) can control the on-off of the switch tube.

FIG. 4 is a schematic structural diagram of an IBA voltage adjustment circuit provided by an embodiment of the present invention. As shown in Figure 4, the IBA voltage adjustment circuit of this embodiment includes: a DC voltage input terminal 11, a DC voltage output terminal 12, N voltage adjustment circuits 13, each voltage adjustment circuit 13 includes a switching tube 131, an autotransformer 132 And a rectification and filtering circuit 133, wherein, the input terminal of the switching tube 131 is coupled to the DC voltage input terminal 11, the output terminal of the switching tube 131 is coupled to the input tap of the autotransformer 132, and the output tap of the autotransformer 132 It is coupled with the input end of the rectification filter circuit 133, and the output end of the rectification filter circuit 133 is coupled with the DC voltage output end 12; N is a positive integer.

In this embodiment, since the IBA voltage adjustment circuit includes an autotransformer, and the reference potential of the input tap of the autotransformer and the reference potential of the output tap are the same reference potential. The reference potential of the input tap may be 0 volts. Therefore, it is only necessary to input a potential slightly greater than 0 volts (for example, 10 volts) to the control terminal of the switch tube to control the on-off of the switch tube. In the above technical solution, the IBA voltage adjustment circuit does not need to use a driving winding, a driving transformer or a special driving chip, which helps to reduce the cost of the voltage adjusting circuit.

Optionally, in another embodiment of the present invention, on the basis of the embodiment shown in FIG. 4 above, the N voltage adjustment circuits 13 include N/2 groups of voltage adjustment circuits, and each group of voltage adjustment circuits includes two Voltage adjustment circuit 13, the two voltage adjustment circuits 13 are respectively a first voltage adjustment circuit and a second voltage adjustment circuit, the first voltage adjustment circuit and the second voltage adjustment circuit share a magnetic core, the first voltage adjustment circuit The polarity of the autotransformer 132 in the second voltage adjustment circuit is opposite to that of the autotransformer 132 in the second voltage adjustment circuit; wherein, N is specifically an even number.

Optionally, the working phases of the N/2 switch tubes in the N/2 first voltage regulating circuits in the N/2 group of voltage regulating circuits are in the range of 0 degrees to 180 degrees, and the working phases of adjacent The difference between the working phases of the two switching tubes is 360°/N, and the difference between the working phases of the two switching tubes in each set of voltage adjusting circuits in the N/2 groups of voltage adjusting circuits is 180°.

Optionally, the duty cycle of each of the N switch tubes 131 in the N voltage adjustment circuits 13 is M, and M is greater than or equal to 40% and less than or equal to 60%.

Optionally, in another embodiment of the present invention, on the basis of the embodiment shown in FIG. 4 above, the N autotransformers 132 in the N voltage adjustment circuits 13 include N magnetic cores, and the N The autotransformer 132 corresponds to the N magnetic cores one by one, and the topology of the IBA voltage adjustment circuit is a forward topology.

Optionally, the working phases of the N switching tubes 131 in the N voltage adjusting circuits 13 are in the range of 0° to 360°, and the difference between the working phases of the two switching tubes 131 with adjacent working phases is 360°/N .

Optionally, the duty cycle of each of the N switch tubes 131 in the N voltage adjustment circuits 13 is M, and M is greater than or equal to 40% and less than or equal to 60%.

Optionally, in another embodiment of the present invention, on the basis of each embodiment of the above-mentioned IBA voltage adjustment circuit, the output of each autotransformer 132 in the N autotransformers 132 in the N voltage adjustment circuits 13 The transformation ratio is K:1, and K is greater than or equal to 3 and less than or equal to 6.5.

Optionally, the voltage at the DC voltage input terminal 11 is S volts, and the voltage at the DC voltage output terminal 12 is T volts, wherein S is a natural number, and S is greater than or equal to 36 and less than or equal to 75; T is a natural number, And T is greater than or equal to 9 and less than or equal to 14.

Optionally, in another embodiment of the present invention, on the basis of each embodiment of the above-mentioned IBA voltage regulation circuit, the above-mentioned IBA voltage regulation circuit further includes a point-of-load power supply POL voltage regulation module and a load, and the DC voltage output terminal 12 It is coupled with the input end of the POL voltage regulating module, and the output end of the POL voltage regulating module is coupled with the input end of the load.

For example, the load could be a CPU, ASIC, memory, sound card or graphics card.

Optionally, in another embodiment of the present invention, on the basis of each embodiment of the above-mentioned IBA voltage adjustment circuit, the above-mentioned IBA voltage adjustment circuit further includes an isolated regulated power supply, and the input of the isolated regulated power supply terminal is coupled with the DC voltage input terminal 11.

Optionally, in another embodiment of the present invention, on the basis of each embodiment of the above-mentioned IBA voltage adjustment circuit, the above-mentioned IBA voltage adjustment circuit further includes a driver, and the driver is used to control the The switch tube 131 is turned on and off, and the N reference potentials of the N autotransformers 132 in the N voltage adjustment circuits 13 are the same reference potential as the reference potential of the driver.

Optionally, the switching transistor 131 is a metal oxide semiconductor field effect transistor, a bipolar transistor or a thyristor.

FIG. 5 is a schematic structural diagram of another IBA voltage adjustment circuit provided by an embodiment of the present invention. In this embodiment, taking two autotransformers as an example, the technical solution of this embodiment is introduced in detail. As shown in FIG. 5, the IBA voltage adjustment circuit includes: an input terminal 21, an output terminal 22, a first autotransformer 23, a second autotransformer 24, a first main switch tube 25 and a first autotransformer 23 of the first autotransformer 23. A rectification and filtering circuit 26 , a second main switching tube 27 of the second autotransformer 24 , a second rectification and filtering circuit 28 , and a magnetic core 29 .

Wherein, the input end 21 is respectively connected with the first main switch tube 25 and the second main switch tube 27, the first main switch tube 25 is connected with the first autotransformer 23, the second main switch tube 27 is connected with the second autotransformer The transformers 24 are connected, the first autotransformer 23 is connected to the output terminal 22 through the first rectification and filtering circuit 26 , and the second autotransformer 24 is connected to the output terminal 22 through the second rectification and filtering circuit 28 . The first autotransformer 23 and the second autotransformer 24 share a magnetic core 29 , and the same terminals of the first autotransformer 23 and the second autotransformer 24 have opposite polarities.

In addition, the duty cycle of the first main switching tube 25 and the second main switching tube 27 is 50%, and the first main switching tube 25 and the second main switching tube 27 are turned on alternately by 180 degrees.

Optionally, the transformation ratio of the first autotransformer 23 and the second autotransformer 24 is K:1, wherein K is a natural number, and K is greater than or equal to 3 and less than or equal to 6.5.

In this embodiment, for example, taking the input voltage of 48V and K equal to 4 as an example, the working principle of the IBA voltage adjustment circuit is as follows: (1) When the first main switch tube 25 is turned on, the first autotransformer The 2' position of 23 induces a secondary potential of 12V, which is output to the output terminal 22 through the first rectification and filtering circuit 26 . At the same time, point 1 of the second autotransformer 24 is -48V, and point 2 is -12V, which will be blocked by the diode in the second rectification filter circuit 28 .

(2) When the first main switching tube 25 is turned off and the second main switching tube 27 is not turned on immediately, a negative potential is induced at the 2' position of the first autotransformer 23, which will be cut off by the first rectifying and filtering circuit 26, thereby Cannot be exported externally. At the same time, position 1 of the second autotransformer 24 induces a potential of +48V, position 2 induces a potential of 12V, and the remaining energy of the magnetic core 29 is output to the output terminal 22 through the second autotransformer 24 .

(3) When the second main switching tube 27 is turned on, the potential of +12V generated by the second autotransformer 24 is output to the output terminal 22 through the second rectifying and filtering circuit 28 . And the 1 ' of the first autotransformer 23 induces a -48V potential, and the 2' induces a -12V potential, both of which can be stopped by the first rectifying and filtering circuit 26.

(4) When the second main switching tube 27 is turned off, (1) can be repeated.

FIG. 6 is a schematic structural diagram of another IBA voltage adjustment circuit provided by an embodiment of the present invention. In this embodiment, taking two autotransformers as an example, the technical solution of this embodiment is introduced in detail. As shown in Figure 6, the IBA voltage adjustment circuit includes: an input terminal 31, an output terminal 32, a first autotransformer 33, a second autotransformer 34, a first main switching tube 35 and a first autotransformer 33 of the first autotransformer 33. A rectification and filtering circuit 36 , a second main switching tube 37 and a second rectification and filtering circuit 38 of the second autotransformer 34 , a first magnetic core 39 and a second magnetic core 40 .

Wherein, the input terminal 31 is respectively connected with the first main switch tube 35 and the second main switch tube 37, the first main switch tube 35 is connected with the first autotransformer 33, the second main switch tube 37 is connected with the second autotransformer The transformers 34 are connected, the first autotransformer 33 is connected to the output terminal 32 through the first rectification and filtering circuit 36 , and the second autotransformer 34 is connected to the output terminal 32 through the second rectification and filtering circuit 38 . The first autotransformer 33 includes a first magnetic core 39 , and the second autotransformer 34 includes a second magnetic core 40 .

In addition, the duty cycle of the first main switching tube 35 and the second main switching tube 37 is 50%, and the first main switching tube 35 and the second main switching tube 37 are turned on alternately by 180 degrees.

Optionally, the transformation ratio of the first autotransformer 33 and the second autotransformer 34 is K:1, wherein K is a natural number, and K is greater than or equal to 3 and less than or equal to 6.5.

In this embodiment, for example, taking the input voltage of 48V and K equal to 4 as an example, the working principle of the IBA voltage adjustment circuit is as follows: (1) When the first main switch tube 35 is turned on, the first autotransformer 33 The secondary side induces a 12V potential, which is output to the output terminal 32 through the first rectifying and filtering circuit 36 . In addition, it should be noted that when the first main switch tube 35 is turned off, the reset coil is required to perform magnetic reset for the first autotransformer 33 .

(2) When the second main switching tube 37 is turned on, the secondary side of the second autotransformer 34 induces a +12V potential and outputs it to the output terminal 32 through the second rectifying and filtering circuit 38 . In addition, it should be noted that when the second main switch tube 37 is turned off, the reset coil is required to perform magnetic reset for the second autotransformer 34 .

In this embodiment, the IBA voltage adjustment circuit can operate alternately according to the above (1) and (2).

As for the device or system embodiment, since it basically corresponds to the method embodiment, for related parts, please refer to the part of the description of the method embodiment. The device or system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, It can be located in one place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

In the several embodiments provided, it should be understood that the disclosed systems, devices and methods can be implemented in other ways without exceeding the spirit and scope of the present application. The embodiment to be used is only an exemplary example and should not be regarded as a limitation, and the specific content given should not limit the purpose of the application. For example, the division of the units or subunits is only a division of logical functions. In actual implementation, there may be other division methods, such as combining multiple units or multiple subunits. Also, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not implemented.

In addition, the described systems, devices and methods and schematic diagrams of different embodiments may be combined or integrated with other systems, modules, techniques or methods within the scope of the present application. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of devices or units may be in electrical, mechanical or other forms.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above method embodiments can be completed by program instructions and related hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above-mentioned method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (9)

1. an intermediate bus architecture IBA voltage regulation circuit, characterized in that, comprising: A DC voltage input terminal, a DC voltage output terminal, and N voltage adjustment circuits, each voltage adjustment circuit includes a switch tube, an autotransformer, and a rectification filter circuit, wherein the input end of the switch tube is coupled to the DC voltage input end , the output end of the switch tube is coupled to the input tap of the autotransformer, the output tap of the autotransformer is coupled to the input end of the rectification filter circuit, and the output end of the rectification filter circuit is coupled to the DC The voltage output terminal is coupled; N is a positive integer; the reference potential of the input tap of the autotransformer and the reference potential of the output tap are the same reference potential; The N voltage adjustment circuits include N/2 groups of voltage adjustment circuits, each group of voltage adjustment circuits includes two voltage adjustment circuits, and the two voltage adjustment circuits are respectively a first voltage adjustment circuit and a second voltage adjustment circuit, so The first voltage adjustment circuit and the second voltage adjustment circuit share a magnetic core, and the autotransformer in the first voltage adjustment circuit and the autotransformer in the second voltage adjustment circuit have opposite polarities ; Wherein, N is specifically an even number. 2. IBA voltage adjustment circuit according to claim 1, is characterized in that, The working phases of the N/2 switching tubes in the N/2 first voltage regulating circuits in the N/2 groups of voltage regulating circuits are within the range of 0 degrees to 180 degrees, and the two switches with adjacent working phases The difference between the working phases of the tubes is 360°/N, and the difference between the working phases of the two switch tubes in each set of voltage adjusting circuits in the N/2 groups of voltage adjusting circuits is 180°. 3. The IBA voltage adjustment circuit according to claim 1, characterized in that, the N autotransformers in the N voltage adjustment circuits comprise N magnetic cores, and the N autotransformers and the N The magnetic cores are in one-to-one correspondence, and the topology of the IBA voltage adjustment circuit is a forward topology. 4. IBA voltage adjustment circuit according to claim 3, is characterized in that, The working phases of the N switching tubes in the N voltage adjusting circuits are in the range of 0° to 360°, and the difference between the working phases of two switching tubes with adjacent working phases is 360°/N. 5. according to the IBA voltage adjustment circuit described in any one of claims 1 to 4, it is characterized in that, The output transformation ratio of each of the N autotransformers in the N voltage adjustment circuits is K:1, and K is greater than or equal to 3 and less than or equal to 6.5. 6. The IBA voltage regulation circuit according to any one of claims 1 to 4, further comprising a point-of-load power supply POL voltage regulation module and a load, the DC voltage output terminal and the input of the POL voltage regulation module terminal coupling, the output terminal of the POL voltage regulation module is coupled to the input terminal of the load. 7. The IBA voltage adjustment circuit according to any one of claims 1 to 4, further comprising an isolated voltage stabilizing power supply, the input terminal of the isolated voltage stabilizing power supply is connected to the DC voltage input terminal coupling. 8. The IBA voltage adjustment circuit according to any one of claims 1 to 4, further comprising a driver, the driver is used to control the on-off of the switch tube through the control terminal of the switch tube, so The N reference potentials of the N autotransformers in the N voltage adjustment circuits are the same reference potential as the reference potential of the driver. 9. The IBA voltage adjustment circuit according to claim 8, wherein the switch tube is a metal oxide semiconductor field effect transistor, a bipolar transistor or a thyristor.