CN114610582A - Current monitoring device for multi-branch circuit and server - Google Patents
Current monitoring device for multi-branch circuit and server Download PDFInfo
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- CN114610582A CN114610582A CN202210271035.3A CN202210271035A CN114610582A CN 114610582 A CN114610582 A CN 114610582A CN 202210271035 A CN202210271035 A CN 202210271035A CN 114610582 A CN114610582 A CN 114610582A
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- 238000002955 isolation Methods 0.000 claims description 16
- 230000005669 field effect Effects 0.000 claims description 3
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/30—Monitoring
- G06F11/3058—Monitoring arrangements for monitoring environmental properties or parameters of the computing system or of the computing system component, e.g. monitoring of power, currents, temperature, humidity, position, vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16519—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using FET's
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
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Abstract
The invention relates to the field of circuit design, in particular to a current monitoring device and a server for a multi-branch circuit. The device comprises a branch monitoring unit corresponding to each branch, wherein the branch monitoring unit is coupled in the branch and is used for collecting the voltage drop of the branch and converting the voltage drop into sampling voltage to be output; the acquisition unit is used for superposing the sampling voltage outputs of the branch monitoring units to generate superposed voltage and then outputting the superposed voltage; the first conversion unit is used for carrying out current conversion on the superposed voltage output by the acquisition unit so as to generate a main circuit current of the multi-branch circuit. The scheme of the invention does not need HSC specially used for monitoring the total current, greatly reduces the cost, saves the area occupied by parts on the board, is not limited by a through-current path any more, avoids the problem of overhigh temperature rise caused by overlarge current density, and prolongs the service life of the board.
Description
Technical Field
The invention relates to the field of circuit design, in particular to a current monitoring device and a server for a multi-branch circuit.
Background
In a server system, the total current of the system is a very important parameter, and is used in applications such as power balance among server systems, system overcurrent protection and the like. Monitoring system current becomes an important part of the hardware design. A plurality of HSC circuits are required in the server to implement the functions of protection, monitoring, switching and the like. The HSC circuit model is shown in fig. 1A, and the operating principle thereof is that Rsen is a sampling resistor, Q1 is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and the HSC controls the switch of Q1 to realize the switching control from Vin to Vout. And Rsen can generate a voltage drop when the MOSFET is switched on, HSC realizes the sampling of the current passing through the MOSFET by monitoring the voltage drop on the Rsen, and a voltage V in proportional relation with the sampling current is output through a Visen pin of the HSC.
At present, the conventional monitoring method of total current is to place a large-current HSC (Hot Swap Controller) circuit at the front end of the system to implement current monitoring, and then implement switching, protection, monitoring, etc. of different power supplies through the following n HSCs. As shown in FIG. 1B, wherein HSCGeneral assemblyThe HSC 1-HSCn realize the functions of switching, protecting, monitoring and the like from the power output 1 to the power output n. The traditional total current monitoring mode has the following defects: first, a large current HSC needs to be used aloneGeneral assemblyTo do system current monitoring, HSCGeneral assemblyThe cost is high to pass a current no less than the sum of the HSC1 to HSCn currents; second, HSC for system current monitoringGeneral assemblyA certain board card area is occupied, and the layout of parts on the board card is not facilitated; third, in passing through HSCGeneral assemblyWhen the power device is used, the current needs to pass through the power device, the through-current path of the power device is limited by the power device and can be narrowed, the current density of the board card at the input and output positions of the power device is increased, the electric loss is increased, the electricity consumption cost is influenced, and the service life of the board card is influenced by the temperature rise.
Disclosure of Invention
In view of the above, it is desirable to provide a current monitoring device and a server for a multi-branch circuit.
The invention provides a current monitoring device for a multi-branch circuit, which comprises:
the branch monitoring units are coupled in the branches and are used for collecting the voltage drop of the branch and converting the voltage drop into sampling voltage to be output;
the acquisition unit is used for superposing the sampling voltage outputs of the branch monitoring units to generate superposed voltage and then outputting the superposed voltage;
the first conversion unit is used for carrying out current conversion on the superposed voltage output by the acquisition unit so as to generate a main circuit current of the multi-branch circuit.
In some embodiments, the bypass monitoring unit comprises: the device comprises a sampling resistor, a hot plug control chip and an MOSFET tube;
the sampling resistor is connected with the MOSFET in series and then is connected into a branch, two input pins of a hot plug control chip are respectively connected with two ends of the sampling resistor, and a driving pin of the hot plug control chip is connected with a grid electrode of the MOSFET so as to enable the branch to be connected or disconnected; and
the hot plug control chip is configured to generate and output sampling voltage based on two input pins of the hot plug control chip when the branch circuit is conducted.
In some embodiments, the acquisition unit comprises: the circuit comprises an amplifier, a first resistor, a second resistor and a third resistor;
the amplifier is provided with a positive input end, a negative input end and an output end, and the sampling voltage output of each branch monitoring unit is connected to the positive input end;
one end of the first resistor is grounded, the other end of the first resistor is connected with the positive input end, one end of the second resistor is grounded, the other end of the second resistor is connected with the negative input end, one end of the third resistor is connected with the negative input end, and the other end of the third resistor is connected with the output end.
In some embodiments, the collection unit further comprises an isolation resistor corresponding to each branch monitoring unit;
one end of each isolation resistor is connected with the sampling voltage output of the monitoring unit of the corresponding branch, and the other end of each isolation resistor is connected with the positive input end.
In some embodiments, the preset voltage-current relationship parameters of each hot-plug control chip are the same.
In some embodiments, the apparatus further includes a second conversion unit corresponding to each branch circuit monitoring unit, the second conversion unit being configured to current convert the sampled voltage output of each branch circuit monitoring unit to generate a branch circuit current of the multi-branch circuit.
In some embodiments, the first conversion unit and the second conversion unit each perform current conversion based on the following formula;
Isen＝Vo/Gain；
wherein, Isen represents branch circuit current or trunk circuit current, Vo represents the sampling voltage output of the input or hot plug control chip of the amplifier, and Gain represents the voltage-current relation parameter of the plug controller.
In some embodiments, the parallel resistance of the first resistor and all the isolation resistors is equal to the parallel resistance of the second resistor and the third resistor.
In some embodiments, the first resistor and the isolation resistor each have a resistance value between 100 ohms and 500 ohms.
According to the second aspect of the present invention, there is also provided a server, which includes a multi-branch circuit, and the server monitors a trunk current and a branch current of the multi-branch circuit by using the apparatus described in any one of the above.
The current monitoring device and the server for the multi-branch circuit have the following beneficial technical effects: on one hand, HSC specially used for monitoring the total current is not needed, so that the cost is greatly reduced, and the area occupied by parts on the board card is saved; on the other hand, the current does not need to pass through a power device specially used for monitoring the system current, the through-current path of the power device is not limited, the current density and the electric loss caused by high impedance are reduced, the problem of overhigh temperature rise caused by overlarge current density is avoided, and the service life of the board card is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other embodiments can be obtained by using the drawings without creative efforts.
FIG. 1A is a schematic diagram of the HSC circuit operation;
FIG. 1B is a schematic diagram illustrating a conventional overall current monitoring scheme;
fig. 2 is a schematic structural diagram of a current monitoring apparatus for a multi-branch circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the acquisition unit 20 according to an embodiment of the present invention;
FIG. 4A is a schematic diagram of a current path formed by a conventional total current monitoring method;
fig. 4B is a schematic diagram of a current path formed by using a current monitoring device for a multi-branch circuit according to the present invention.
[ description of reference ]
10: a branch monitoring unit; 20: a collecting unit; 30: a first conversion unit; 40: a second conversion unit;
AMP: an amplifier; ri: a first resistor; r2: a second resistor; r3: a third resistor; ri1 to Rin: an isolation resistor; v +: a positive input end; v-: a negative input terminal; .
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In some embodiments, referring to fig. 2, the present invention provides a current monitoring device for a multi-branch circuit, which includes the following structures:
the branch monitoring units 10 are coupled in the branches, and the branch monitoring units 10 are configured to collect voltage drops of the branches and convert the voltage drops into sampling voltage outputs;
the acquisition unit 20 is configured to superpose the sampling voltage outputs of the plurality of branch monitoring units 10 to generate a superposed voltage, and then output the superposed voltage;
a first conversion unit 30, wherein the first conversion unit 30 is configured to perform current conversion on the superimposed voltage output by the acquisition unit 20 to generate a trunk current of a multi-branch circuit.
The current monitoring device for the multi-branch circuit at least has the following beneficial technical effects: on one hand, HSC specially used for monitoring the total current is not needed, so that the cost is greatly reduced, and the area occupied by parts on the board card is saved; on the other hand, the current does not need to pass through a power device specially used for monitoring the system current, the through-current path of the power device is not limited, the current density and the electric loss caused by high impedance are reduced, the problem of overhigh temperature rise caused by overlarge current density is avoided, and the service life of the board card is prolonged.
In some embodiments, referring to fig. 1A, the branch circuit monitoring unit 10 includes: the device comprises a sampling resistor, a hot plug control chip and an MOSFET (metal oxide semiconductor field effect transistor);
the sampling resistor is connected with the MOSFET in series and then is connected into a branch circuit, two input pins of a hot plug control chip are respectively connected with two ends of the sampling resistor, and a driving pin of the hot plug control chip is connected with a grid electrode of the MOSFET so as to enable the branch circuit to be connected or disconnected; and
the hot plug control chip is configured to generate and output sampling voltage based on two input pins of the hot plug control chip when the branch circuit is conducted.
In some embodiments, please refer to fig. 3, the acquiring unit 20 includes: an amplifier AMP, a first resistor Ri, a second resistor R2, and a third resistor R3;
the amplifier AMP has a positive input terminal V +, a negative input terminal V-, and an output terminal, and the sampling voltage output of each branch monitoring unit 10 is connected to the positive input terminal V +;
one end of the first resistor Ri is grounded, the other end of the first resistor Ri is connected with the positive input end V +, one end of the second resistor R2 is grounded, the other end of the second resistor R2 is connected with the negative input end V-, one end of the third resistor R3 is connected with the positive input end V-, and the other end of the third resistor R3 is connected with the output end.
In some embodiments, referring again to fig. 3, the acquisition unit 20 further includes an isolation resistor corresponding to each branch monitoring unit 10;
one end of each isolation resistor is connected with the sampling voltage output of the monitoring unit of the corresponding branch, and the other end of each isolation resistor is connected with the positive input end V +.
In some embodiments, the preset voltage-current relationship parameters of each hot-plug control chip are the same.
In some embodiments, the apparatus further includes a second converting unit 40 corresponding to each branch monitoring unit 10, the second converting unit 40 being configured to perform current conversion on the sampled voltage output of each branch monitoring unit 10 to generate a branch current of the multi-branch circuit.
In some embodiments, the first conversion unit 30 and the second conversion unit 40 each perform current conversion based on the following formula;
Isen＝Vo/Gain；
wherein, Isen represents branch circuit current or trunk circuit current, Vo represents the sampling voltage output of the input or hot plug control chip of the amplifier AMP, and Gain represents the voltage-current relation parameter of the plug controller.
In some embodiments, the parallel resistance of the first resistor Ri and all the isolation resistors is equal to the parallel resistance of the second resistor R3 and the third resistor R3.
In some embodiments, the resistance values of the first resistor Ri and the isolation resistor are both between 100 ohms and 500 ohms.
In some embodiments, to facilitate understanding of the technical solution of the present invention, a power supply circuit of a server is taken as an example for explanation, please refer to fig. 2, without assuming that the power supply circuit of the server has a total power input, n (n is an integer greater than or equal to 2) power outputs are denoted as power output 1 to power output n, and a current monitoring scheme for the power supply circuit of the server is as follows:
HSC is not required after power inputGeneral assemblyFor system current monitoring, the current flows directly to each of the branch HSCs (i.e., HSC 1-HSCn), and the branch HSCs output the monitor value V (i.e., V1-Vn) respectively using their own current monitor pins Visen. The acquisition unit uses the working principle of an amplifier AMP, and Vo can be calculated by using the superposition principle.
To improve the common mode rejection ratio of the circuit and reduce the zero drift, resistance balancing is required: for convenience of calculation, Ri1// Ri2// Ri3// …// Rin// Ri — R1// Rf, where Ri1 — Ri2 — Ri3 — Ri … — Rin — Ri:
V+＝V1/(n+1)+V2/(n+1)+V3/(n+1)…+Vn/(n+1)＝(V1+V2+V3…+Vn)/(n+1)
for an ideal amplifier AMP, V + ═ V-Vo ═ V + (R1+ Rf)/R1, let Rf ═ n × R1 give:
Vo＝V+*(R1+Rf)/R1
＝(V1+V1+V3…+Vn)/(n+1)*(R1+Rf)/R1
＝(V1+V1+V3…+Vn)/(n+1)*(R1+n*R1)/R1
＝V1+V1+V3…+Vn
it follows that monitoring the output Vo of the amplifier AMP results in a monitored power supply input current of: isen is Vo/Gain. Meanwhile, as shown in fig. 4A and 4B, the HSC is no longer used to detect the main current on the power main, and the current path is expanded, so that the current path is no longer limited, and the voltage drop and power consumption are reduced.
The current monitoring device applied to the power supply circuit of the server has the following beneficial effects: (1) HSC that no longer need to be dedicated to monitoring system currentGeneral (1)The monitoring circuit consisting of AMP with low cost and a resistor is adopted, so that the cost is greatly reduced; (2) the HSC specially used for monitoring the system main circuit current is not needed, and the area occupied by parts on the board card is saved; (3) the current does not need to pass through a power device specially used for monitoring the system current, the through-current path is not limited, and the electric loss caused by overlarge current density and high impedance is reduced; (4) the current does not need to pass through a power device specially used for monitoring the system current, the through-current path of the current is not limited, the problem of overhigh temperature rise caused by overlarge current density is solved, and the service life of the board card is prolonged.
In another embodiment, the present invention further provides a server, where the server includes a multi-branch circuit, and the server monitors a trunk current and a branch current of the multi-branch circuit by using the apparatus in any of the above embodiments.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A current monitoring device for a multi-branch circuit, the device comprising:
the branch monitoring units are coupled in the branches and are used for collecting the voltage drop of the branch and converting the voltage drop into sampling voltage to be output;
the acquisition unit is used for superposing the sampling voltage outputs of the branch monitoring units to generate superposed voltage and then outputting the superposed voltage;
the first conversion unit is used for carrying out current conversion on the superposed voltage output by the acquisition unit so as to generate a main circuit current of the multi-branch circuit.
2. The current monitoring device for a multi-branch circuit according to claim 1, wherein the branch monitoring unit comprises: the device comprises a sampling resistor, a hot plug control chip and an MOSFET (metal oxide semiconductor field effect transistor);
the sampling resistor is connected with the MOSFET in series and then is connected into a branch, two input pins of a hot plug control chip are respectively connected with two ends of the sampling resistor, and a driving pin of the hot plug control chip is connected with a grid electrode of the MOSFET so as to enable the branch to be connected or disconnected; and
the hot plug control chip is configured to generate and output sampling voltage based on two input pins of the hot plug control chip when the branch circuit is conducted.
3. The current monitoring device for a multi-branch circuit according to claim 2, wherein the collecting unit comprises: the circuit comprises an amplifier, a first resistor, a second resistor and a third resistor;
the amplifier is provided with a positive input end, a negative input end and an output end, and the sampling voltage output of each branch monitoring unit is connected to the positive input end;
one end of the first resistor is grounded, the other end of the first resistor is connected with the positive input end, one end of the second resistor is grounded, the other end of the second resistor is connected with the negative input end, one end of the third resistor is connected with the negative input end, and the other end of the third resistor is connected with the output end.
4. The current monitoring device for a multi-branch circuit according to claim 3, wherein the collecting unit further comprises an isolation resistor corresponding to each branch monitoring unit;
one end of each isolation resistor is connected with the sampling voltage output of the monitoring unit of the corresponding branch, and the other end of each isolation resistor is connected with the positive input end.
5. The device as claimed in claim 4, wherein the preset voltage-current relationship parameters of each hot-plug control chip are the same.
6. The current monitoring device of claim 5, further comprising a second conversion unit corresponding to each branch circuit monitoring unit, the second conversion unit being configured to current convert the sampled voltage output of each branch circuit monitoring unit to generate a branch current of the multi-branch circuit.
7. The current monitoring device for a multi-branch circuit according to claim 6, wherein each of said first converting unit and said second converting unit performs current conversion based on the following formula;
Isen＝Vo/Gain；
where Isen represents the branch or trunk current, VoThe output of the amplifier or the sampling voltage output of the hot plug control chip is represented, and Gain represents the voltage-current relation parameter of the plug controller.
8. The current monitoring device according to claim 4, wherein the first resistor and all the isolation resistors have parallel resistances equal to the parallel resistances of the second resistor and the third resistor.
9. The current monitoring device of claim 4, wherein the first resistor and the isolation resistor each have a resistance value between 100 ohms and 500 ohms.
10. A server comprising a multi-branch circuit, the server monitoring trunk and branch currents of the multi-branch circuit using the apparatus of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210271035.3A CN114610582A (en) | 2022-03-18 | 2022-03-18 | Current monitoring device for multi-branch circuit and server |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210271035.3A CN114610582A (en) | 2022-03-18 | 2022-03-18 | Current monitoring device for multi-branch circuit and server |
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| Publication Number | Publication Date |
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| CN114610582A true CN114610582A (en) | 2022-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210271035.3A Pending CN114610582A (en) | 2022-03-18 | 2022-03-18 | Current monitoring device for multi-branch circuit and server |
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| CN (1) | CN114610582A (en) |
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- 2022-03-18 CN CN202210271035.3A patent/CN114610582A/en active Pending
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