CN103268144A - Power monitoring device and overcurrent protection method - Google Patents
Power monitoring device and overcurrent protection method Download PDFInfo
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Abstract
The invention provides a power monitoring device and an overcurrent protection method and belongs to the field of computer power supply management. The power monitoring device comprises a mainboard monitoring unit, a numerical control potentiometer, a power consumption monitoring chip and a switch, wherein the numerical control potentiometer is connected in series with a divider resistor and then is connected between a VCAP pin and an ISET pin of the power consumption monitoring chip; the mainboard monitoring unit is used for acquiring configuration information of the mainboard, calculating the power consumption requirements of the mainboard according to the configuration information, determining a target resistance value of the numerical control potentiometer according to the power consumption requirements, transmitting a data signal to the numerical control potentiometer and regulating the resistance value of the numerical control potentiometer to be the target resistance value; the power consumption monitoring chip is connected with a mainboard power supply through the switch, and when the mainboard current is monitored to exceed a current threshold, the switch is shut down, so that the mainboard power supply is cut off. Different chip platforms are adapted by employing a same overcurrent protection current, so that the development time and development cost can be reduced.
Description
Technical field
The present invention relates to the computer electric power management field, relate in particular to a kind of apparatus for monitoring power supply and over-current protection method.
Background technology
Along with development in science and technology, the server field also is faced with dramatic change, and except original X86 framework, ARM also will more and more be applied to the server field by feat of outstanding power consumption control and performance.And in the design of the power supply of existing server, be according to different chip platforms, namely design and the hardware specification different according to chip platform designs corresponding overcurrent protection (OCP) circuit, makes the development time longer, and cost of development is also higher.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of apparatus for monitoring power supply and over-current protection method, can adopt same apparatus for monitoring power supply (current foldback circuit) to come the different chip platform of self-adaptation.
For achieving the above object, it is as follows to the invention provides technical scheme:
A kind of apparatus for monitoring power supply comprises mainboard monitoring unit, numerical control pot, power consumption monitoring chip and switch, wherein:
Described numerical control pot is connected between the constant voltage output pin VCAP and reference voltage input pin ISET of described power consumption monitoring chip with after a divider resistance is connected;
Described mainboard monitoring unit is used for obtaining the configuration information of mainboard, calculate the power consumption demand of mainboard according to described configuration information, determine to realize the potentiometric target resistance values of the required numerical control of overcurrent protection according to described power consumption demand, and send data signals to described numerical control pot, be described target resistance values with the potentiometric resistance value adjusting of described numerical control, thereby the reference voltage of ISET pin input is adjusted to the current threshold corresponding reference voltage required with overcurrent protection;
Described power consumption monitoring chip is connected with motherboard power supply by described switch, when monitoring the mainboard electric current above behind the current threshold, closes described switch, thereby cuts off motherboard power supply.
Above-mentioned apparatus for monitoring power supply, wherein: described switch is metal-oxide-semiconductor field effect transistor.
Above-mentioned apparatus for monitoring power supply, wherein: described mainboard monitoring unit is identified the ID of mainboard automatically, by the configuration information that obtains mainboard of mainboard ID; Described mainboard monitoring unit is further used for: determine the current threshold that overcurrent protection is required according to described power consumption demand, determine the potentiometric target resistance values of numerical control according to described current threshold.
Above-mentioned apparatus for monitoring power supply, wherein: connect with described divider resistance again after described numerical control pot and the accurate resistance parallel connection.
Above-mentioned apparatus for monitoring power supply, wherein: described numerical control pot adopts ISL90727, and described power consumption monitoring chip adopts TPS2483 or ADM1276.
Above-mentioned apparatus for monitoring power supply, wherein: described mainboard monitoring unit is micro-control unit MCU or baseboard management controller BMC; Be connected by I2C bus or System Management Bus SMbus between described mainboard monitoring unit and the described numerical control pot.
Above-mentioned apparatus for monitoring power supply, wherein, described mainboard monitoring unit is further used for:
Determine current threshold according to described power consumption demand; Determine to detect ohmically voltage threshold according to current threshold; Determine the reference voltage level of ISET pin according to voltage threshold; According to fixed voltage value and the reference voltage level of needed ISET pin and the resistance of described divider resistance of VCAP pin output, determine the potentiometric target resistance values of numerical control.
A kind of over-current protection method comprises:
The numerical control pot with after divider resistance is connected, is connected between the constant voltage output pin VCAP and reference voltage input pin ISET of power consumption monitoring chip;
The power consumption monitoring chip is connected with motherboard power supply by switch;
Obtain the configuration information of mainboard, calculate the power consumption demand of mainboard according to described configuration information, determine to realize the potentiometric target resistance values of the required numerical control of overcurrent protection according to described power consumption demand, and the potentiometric resistance value of described numerical control is adjusted to described target resistance values, thereby the reference voltage of ISET pin input is adjusted to the current threshold corresponding reference voltage required with overcurrent protection;
The power consumption monitoring chip monitors the mainboard electric current above behind the current threshold, closes described switch, thereby cuts off motherboard power supply.
Above-mentioned over-current protection method, wherein: described switch is metal-oxide-semiconductor field effect transistor.
Above-mentioned over-current protection method wherein, also comprises: connect with described divider resistance after described numerical control pot and the accurate resistance parallel connection again.。
With compare for the different current foldback circuit of different chip platform (server platform) design in the prior art; the present invention is by obtaining the configuration information of mainboard; calculate the power consumption demand of mainboard according to described configuration information; and according to the potentiometric resistance value of power consumption demand self-adaptation adjustment numerical control; be equivalent to the adaptive current threshold that overcurrent protection is set and satisfy different mainboards to the demand of power consumption; realized coming the different chip platform of self-adaptation with same holding circuit; like this; just do not need to do different designs for different platforms, thereby can reduce development time and cost of development.
Description of drawings
Fig. 1 is the structural drawing of the apparatus for monitoring power supply of the embodiment of the invention;
Fig. 2 is the process flow diagram of the over-current protection method of the embodiment of the invention;
Fig. 3 is the physical circuit figure of the apparatus for monitoring power supply of the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the embodiment of the invention is described in detail.
Fig. 1 is the structural drawing of the apparatus for monitoring power supply of the embodiment of the invention.With reference to Fig. 1, described apparatus for monitoring power supply can comprise mainboard monitoring unit 1, numerical control pot 2, power consumption monitoring chip 3 and switch 4, and switch 4 can be any suitable switch in metal-oxide-semiconductor field effect transistor or the prior art, wherein:
Mainboard monitoring unit 1 is connected with server master board on the one hand, can obtain the configuration information of mainboard; Mainboard monitoring unit 1 also is connected with numerical control pot (XDCP) 2 on the other hand, by sending data signals to numerical control pot 2, the resistance value that can regulate numerical control pot 2.
Mainboard monitoring unit 1 can adopt micro-control unit (Micro Control Unit, MCU), also can adopt baseboard management controller (Baseboard Management Controller, BMC), numerical control pot 2 can adopt ISL90727, also can adopt the numerical control pot of other models.Can be connected by the I2C bus between mainboard monitoring unit 1 and the numerical control pot 2, also can pass through System Management Bus (SMbus) and connect.During specific implementation, I2C bus or SMbus can also be connected with a positive supply by a pull-up resistor, for example, are connected with the 3v3 positive supply.
Numerical control pot 2 is connected between the constant voltage output pin (VCAP) and reference voltage input pin (ISET) of power consumption monitoring chip 3 with after divider resistance R01 connects.The resistance value scope of numerical control pot 2 can be set at 10K～50K, and for improving precision, numerical control pot 2 can also be connected with divider resistance R01 earlier with after the precision resistance R02 parallel connection again.Like this, between the VCAP of power consumption monitoring chip 3 pin and ISET pin, just formed a resistive divider network, because the output voltage of VCAP pin is constant, by numerical control pot 2 is adjusted to different resistance values, just can make the ISET pin import the reference voltages of different sizes, be equivalent to offer the different reference voltage of internal current supervisory circuit of power consumption monitoring chip 3, make described internal current supervisory circuit have different current thresholds.
Power consumption monitoring chip 3 is connected with the grid of metal-oxide-semiconductor field effect transistor 4, can control opening (conducting) or closing (ending) of metal-oxide-semiconductor field effect transistor 4, when metal-oxide-semiconductor field effect transistor 4 is opened, and the conducting of motherboard power supply path, when closing, the motherboard power supply path disconnects.Power consumption monitoring chip 3 is connected in the motherboard power supply path, and power consumption monitoring chip 3 can adopt TPS2483 or ADM1276, certainly, also can adopt the power consumption monitoring chip of other types.Among Fig. 1, VIN and VOUT import for example positive voltage of 12V at metal-oxide-semiconductor field effect transistor 4 from VIN, when metal-oxide-semiconductor field effect transistor 4 is opened, and VIN=VOUT, 12V voltage enters mainboard, otherwise closes metal-oxide-semiconductor field effect transistor 4, then mainboard outage.
Particularly, the positive current that has power consumption monitoring chip 3 detects input end pin (SENSE_P) and negative current detection input end pin (SENSE_N), the SENSE_P pin is connected to the power supply input, can measure in the motherboard power supply path by SENSE-P pin and SENSE_N pin and detect resistance R
SENSEThe voltage at two ends, and load current can detect resistance R by measuring
SENSEOn pressure drop monitor, for R
SENSEGo up detected pressure drop, the internal current detecting amplifier of power consumption monitoring chip 3 provides 50 times gain, detection voltage after the internal current supervisory circuit will be amplified is compared with the reference voltage of importing from the ISET pin, judge whether to take place the situation of overcurrent according to comparative result, particularly, detection voltage after amplifying determines to take place overcurrent during greater than described reference voltage.As seen, V
ISET=V
SENSE* 50, wherein, V
ISETBe the reference voltage of ISET input pin input, V
SENSEFor the threshold value that detects voltage (with current threshold corresponding relation is arranged, particularly, V
SENSEDivided by R
SENSEEqual current threshold).That is to say, by regulating the resistance value of numerical control pot 2, just can regulate the reference voltage value of ISET pin input, thereby adjust the voltage threshold of motherboard power supply, also just be equivalent to adjust the current threshold in the motherboard power supply path.
The power consumption monitoring chip 3 for example principle of work of TPS2483 or ADM1276 can repeat no more here with reference to relevant criterion or product description.
Based on the annexation of above each parts that provides and the principle of work of each parts, the apparatus for monitoring power supply of the embodiment of the invention carries out overcurrent protection to the mainboard electric current principle of work is described below:
Mainboard monitoring unit 1 obtains the configuration information of mainboard, calculate the power consumption demand of mainboard according to described configuration information, determine to realize the target resistance values of the required numerical control pot 2 of overcurrent protection according to described power consumption demand, and transmit a signal to described numerical control pot 2, be described target resistance values with the resistance value adjusting of numerical control pot 2, thereby the reference voltage of ISET pin input is adjusted to the current threshold corresponding reference voltage required with overcurrent protection; 3 pairs of mainboard electric currents of power consumption monitoring chip are monitored, and when monitoring the mainboard electric current above behind the current threshold, close metal-oxide-semiconductor field effect transistor 4, thereby cut off motherboard power supply.
In the above-described embodiments, mainboard monitoring unit 1 can also be connected with power consumption monitoring chip 3 by the I2C bus, obtains the real time power consumption of mainboard, and the real time power consumption that gets access to can be offered data center and manage.
The embodiment of the invention also provides a kind of over-current protection method.Fig. 2 is the process flow diagram of the over-current protection method of the embodiment of the invention, and with reference to Fig. 2, described over-current protection method can comprise the steps:
Step 201: the mainboard monitoring unit is connected between mainboard and the numerical control pot;
Step 202: the numerical control pot with after divider resistance is connected, is connected between the VCAP pin and ISET pin of power consumption monitoring chip;
Alternatively, can also connect with described divider resistance again after described numerical control pot and the accurate resistance parallel connection.
Step 203: with the power consumption monitoring chip by a switch for example metal-oxide-semiconductor field effect transistor be connected with motherboard power supply;
Wherein, the power consumption monitoring chip is connected in the power source path of mainboard, detects voltage or the electric current that resistance can be measured power source path by one.
Step 204: the mainboard monitoring unit obtains the configuration information of mainboard, calculates the power consumption demand of mainboard according to described configuration information;
The mainboard monitoring unit can be MCU or BMC, MCU or BMC can identify mainboard chip platform type and/or platform configuration by the ID (MB_ID) that obtains mainboard behind electrification reset, for example be ARM platform, ATOM platform, X86 framework multi processor platform or Micro-Server etc.The configuration information how the mainboard monitoring unit obtains mainboard can adopt any technique known, for example, can identify mainboard by the last pull down resistor setting on the mainboard is X86 framework or ARM framework, perhaps, obtain by the CPLD on the mainboard, CPLD can obtain CPU quantity after start, hard disk quantity, and BMC can obtain amount of memory.Then, just can calculate the power consumption demand of mainboard according to the hardware configuration information that obtains.Generally speaking, after the hardware configuration of mainboard was determined, those skilled in the art then were easy to determine power consumption demand according to this hardware configuration, for example can adopt prior art to determine power consumption demand therefore, no longer to describe here in detail.
Step 205: the mainboard monitoring unit is determined the potentiometric target resistance values of the realization required numerical control of overcurrent protection according to described power consumption demand, and sends data signals to described numerical control pot, and the potentiometric resistance value of described numerical control is adjusted into described target resistance values;
As previously mentioned, for power consumption monitoring chip, V
ISET=V
SENSE* 50, wherein, V
ISETBe the reference voltage of ISET input pin input, V
SENSEFor detecting the threshold value (corresponding relation being arranged with current threshold) of voltage.As seen, determine to realize that according to described power consumption demand the potentiometric target resistance values of the required numerical control of overcurrent protection specifically comprises:
At first, determine current threshold according to described power consumption demand; Secondly, determine V according to current threshold
SENSEValue; Then, according to V
SENSEValue is determined V
ISETValue; At last, owing to the magnitude of voltage of VCAP pin output is fixed, according to this fixing magnitude of voltage and needed V
ISETValue just can be determined the potentiometric target resistance values of numerical control in the resitstance voltage divider (be made of the divider resistance R01 among Fig. 1 and numerical control pot, perhaps, be made of the divider resistance R01 among Fig. 1, precision resistance R02 and numerical control pot).
After the potentiometric target resistance values of definite numerical control, it is target resistance values that MCU or BMC then can arrange the potentiometric resistance value of described numerical control by the I2C bus.
Step 206: the power consumption monitoring chip is monitored the electric current of mainboard, when monitoring the mainboard electric current above behind the current threshold, closes described metal-oxide-semiconductor field effect transistor, thereby cuts off motherboard power supply.
Below provide a specific implementation of the apparatus for monitoring power supply of the embodiment of the invention.
Fig. 3 is the physical circuit figure of the apparatus for monitoring power supply of the embodiment of the invention, as shown in Figure 3:
BMC/MCU is connected with numerical control pot (XDCP), particularly, it is the SCL pin that is connected to XDCP by clock line XDCP_SCL, be connected to the SDA pin of XDCP by data line XDCP_SDA, in addition, clock line also is connected with 3V3 positive supply (p_3V3) by a pull-up resistor respectively with data line.
The RH pin (potentiometer is high-end) of XDCP is connected to the ISET pin of power consumption monitoring chip, RW pin (potentiometer sliding end) is connected to the VCAP pin of power consumption monitoring chip by two resistance, in addition, the ISET pin of power consumption monitoring chip also is connected between these two resistance.
The SENSE_P pin of power consumption monitoring chip is connected with the SENSE+ in the power source path, and the SENSE_N pin is connected with SENSE-in the current path, can measure the voltage that detects the resistance two ends in the power source path.The GATE pin of power consumption monitoring chip is connected to the grid of metal-oxide-semiconductor field effect transistor, when the electric current in monitoring power source path surpasses current threshold, the output corresponding signal is to the grid of metal-oxide-semiconductor field effect transistor, close metal-oxide-semiconductor field effect transistor, the output of metal-oxide-semiconductor field effect transistor no current, be not output of pVCC_IN, thereby cut off motherboard power supply.
In sum; the embodiment of the invention is by obtaining the configuration information of mainboard; calculate the power consumption demand of mainboard according to described configuration information; and according to the potentiometric resistance value of power consumption demand self-adaptation adjustment numerical control; be equivalent to the adaptive current threshold that overcurrent protection is set and satisfy different mainboards to the demand of power consumption, realized coming the different chip platform of self-adaptation with same holding circuit, like this; just do not need to do different designs for different platforms, thereby can reduce development time and cost of development
Need to prove, can in such as the computer system that is provided with one group of computer executable instructions, carry out in the step shown in the process flow diagram of accompanying drawing, and, though there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.In addition, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the memory storage and be carried out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. an apparatus for monitoring power supply is characterized in that, comprises mainboard monitoring unit, numerical control pot, power consumption monitoring chip and switch, wherein:
Described numerical control pot is connected between the constant voltage output pin VCAP and reference voltage input pin ISET of described power consumption monitoring chip with after a divider resistance is connected;
Described mainboard monitoring unit is used for obtaining the configuration information of mainboard, calculate the power consumption demand of mainboard according to described configuration information, determine to realize the potentiometric target resistance values of the required numerical control of overcurrent protection according to described power consumption demand, and send data signals to described numerical control pot, be described target resistance values with the potentiometric resistance value adjusting of described numerical control, thereby the reference voltage of ISET pin input is adjusted to the current threshold corresponding reference voltage required with overcurrent protection;
Described power consumption monitoring chip is connected with motherboard power supply by described switch, when monitoring the mainboard electric current above behind the current threshold, closes described switch, thereby cuts off motherboard power supply.
2. apparatus for monitoring power supply as claimed in claim 1 is characterized in that:
Described switch is metal-oxide-semiconductor field effect transistor.
3. apparatus for monitoring power supply as claimed in claim 2 is characterized in that:
Described mainboard monitoring unit is identified the ID of mainboard automatically, obtains the configuration information of mainboard by the ID of mainboard;
Described mainboard monitoring unit is further used for: determine the current threshold that overcurrent protection is required according to described power consumption demand, determine the potentiometric target resistance values of numerical control according to described current threshold.
4. apparatus for monitoring power supply as claimed in claim 2 is characterized in that:
Connect with described divider resistance again after described numerical control pot and the accurate resistance parallel connection.
5. apparatus for monitoring power supply as claimed in claim 2 is characterized in that:
Described numerical control pot adopts ISL90727, and described power consumption monitoring chip adopts TPS2483 or ADM1276.
6. apparatus for monitoring power supply as claimed in claim 2 is characterized in that:
Described mainboard monitoring unit is micro-control unit MCU or baseboard management controller BMC; Be connected by I2C bus or System Management Bus SMbus between described mainboard monitoring unit and the described numerical control pot.
7. apparatus for monitoring power supply as claimed in claim 2 is characterized in that, described mainboard monitoring unit is further used for:
Determine current threshold according to described power consumption demand; Determine to detect ohmically voltage threshold according to current threshold; Determine the reference voltage level of ISET pin according to voltage threshold; According to fixed voltage value and the reference voltage level of needed ISET pin and the resistance of described divider resistance of VCAP pin output, determine the potentiometric target resistance values of numerical control.
8. an over-current protection method is characterized in that, comprising:
The numerical control pot with after divider resistance is connected, is connected between the constant voltage output pin VCAP and reference voltage input pin ISET of power consumption monitoring chip;
The power consumption monitoring chip is connected with motherboard power supply by switch;
Obtain the configuration information of mainboard, calculate the power consumption demand of mainboard according to described configuration information, determine to realize the potentiometric target resistance values of the required numerical control of overcurrent protection according to described power consumption demand, and be described target resistance values with the potentiometric resistance value adjusting of described numerical control, thereby the reference voltage of ISET pin input is adjusted to the current threshold corresponding reference voltage required with overcurrent protection;
The power consumption monitoring chip monitors the mainboard electric current above behind the current threshold, closes described switch, thereby cuts off motherboard power supply.
9. over-current protection method as claimed in claim 8 is characterized in that:
Described switch is metal-oxide-semiconductor field effect transistor.
10. over-current protection method as claimed in claim 9 is characterized in that, also comprises:
Connect with described divider resistance again after described numerical control pot and the accurate resistance parallel connection.
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