CN103268144B - Apparatus for monitoring power supply and over-current protection method - Google Patents
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Abstract
The present invention provides a kind of apparatus for monitoring power supply and over-current protection method, belongs to computer electric power management field.Described apparatus for monitoring power supply includes mainboard monitoring unit, numerical control potentiometer, power consumption monitoring chip and switch, wherein: after numerical control potentiometer and divider resistance series connection, be connected between the VCAP pin of power consumption monitoring chip and ISET pin；Mainboard monitoring unit is for obtaining the configuration information of mainboard, the power consumption demand of mainboard is calculated according to configuration information, determine the potentiometric target resistance values of numerical control according to power consumption demand, and send data signals to numerical control potentiometer, be target resistance values by potentiometric for numerical control resistance value adjusting；Power consumption monitoring chip is connected with motherboard power supply by switch, when monitoring after mainboard electric current exceedes current threshold, and closing switch, thus cut off motherboard power supply.Present invention achieves the same current foldback circuit of employing and carry out the chip platform that self adaptation is different, such that it is able to reduce development time and development cost.
Description
Technical field
The present invention relates to computer electric power management field, particularly relate to a kind of apparatus for monitoring power supply and over-current protection method.
Background technology
Along with development in science and technology, server field is also faced with dramatic change, and except original X86-based, ARM also will more and more be applied to server field by feat of outstanding power consumption control and performance.And in the Power Management Design of existing server, i.e. according to the different design of chip platform and hardware specification, corresponding overcurrent protection (OCP) circuit to be designed so that the development time is longer according to different chip platforms, development cost is the highest.
Summary of the invention
In view of this, it is an object of the invention to provide a kind of apparatus for monitoring power supply and over-current protection method, same apparatus for monitoring power supply (current foldback circuit) can be used to carry out the chip platform that self adaptation is different.
For achieving the above object, the present invention provides technical scheme as follows:
A kind of apparatus for monitoring power supply, including mainboard monitoring unit, numerical control potentiometer, power consumption monitoring chip and switch, wherein:
After described numerical control potentiometer and divider resistance series connection, it is connected between the constant voltage output pin VCAP of described power consumption monitoring chip and reference voltage input pin ISET；
Described mainboard monitoring unit is for obtaining the configuration information of mainboard; the power consumption demand of mainboard is calculated according to described configuration information; the potentiometric target resistance values of numerical control needed for realizing overcurrent protection is determined according to described power consumption demand; and send data signals to described numerical control potentiometer; it is described target resistance values by potentiometric for described numerical control resistance value adjusting, thus the reference voltage that ISET pin inputs is adjusted to the reference voltage corresponding with the current threshold needed for overcurrent protection；
Described power consumption monitoring chip is connected with motherboard power supply by described switch, when monitoring after mainboard electric current exceedes current threshold, closes described switch, thus 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 identifies the ID of mainboard automatically, by the configuration information obtaining mainboard of mainboard ID；Described mainboard monitoring unit is further used for: determine the current threshold needed for overcurrent protection according to described power consumption demand, determines 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 potentiometer and a precise resistances parallel connection.
Above-mentioned apparatus for monitoring power supply, wherein: described numerical control potentiometer uses ISL90727, described power consumption monitoring chip uses 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；It is connected by I2C bus or System Management Bus SMbus between described mainboard monitoring unit with described numerical control potentiometer.
Above-mentioned apparatus for monitoring power supply, wherein, described mainboard monitoring unit is further used for:
Current threshold is determined according to described power consumption demand；The ohmically voltage threshold of detection is determined according to current threshold；The reference voltage level of ISET pin is determined according to voltage threshold；The reference voltage level of fixed voltage value and required ISET pin according to the output of VCAP pin and the resistance of described divider resistance, determine the potentiometric target resistance values of numerical control.
A kind of over-current protection method, including:
After numerical control potentiometer is connected with divider resistance, it is connected between the constant voltage output pin VCAP of power consumption monitoring chip and reference voltage input pin ISET；
Power consumption monitoring chip is connected with motherboard power supply by switch；
Obtain the configuration information of mainboard; the power consumption demand of mainboard is calculated according to described configuration information; the potentiometric target resistance values of numerical control needed for realizing overcurrent protection is determined according to described power consumption demand; and potentiometric for described numerical control resistance value is adjusted to described target resistance values, thus the reference voltage that ISET pin inputs is adjusted to the reference voltage corresponding with the current threshold needed for overcurrent protection；
After power consumption monitoring chip monitoring exceedes current threshold to mainboard electric current, close described switch, thus cut 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 includes: connect with described divider resistance after described numerical control potentiometer and a precise resistances parallel connection again.
Compared with designing different current foldback circuits with the chip platform (server platform) being different in prior art, the present invention is by obtaining the configuration information of mainboard, the power consumption demand of mainboard is calculated according to described configuration information, and according to the power consumption demand potentiometric resistance value of self-adaptative adjustment numerical control, be equivalent to the adaptive current threshold that overcurrent protection is set and meet the different mainboard demand to power consumption, achieve and carry out, by same protection circuit, the chip platform that self adaptation is different, so, avoid the need for doing different designs for different platforms, such that it is able to reduce development time and development cost.
Accompanying drawing explanation
Fig. 1 is the structure chart of the apparatus for monitoring power supply of the embodiment of the present invention；
Fig. 2 is the flow chart of the over-current protection method of the embodiment of the present invention；
Fig. 3 is the physical circuit figure of the apparatus for monitoring power supply of the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the embodiment of the present invention is described in detail.
Fig. 1 is the structure chart of the apparatus for monitoring power supply of the embodiment of the present invention.With reference to Fig. 1, described apparatus for monitoring power supply can include mainboard monitoring unit 1, numerical control potentiometer 2, power consumption monitoring chip 3 and switch 4, and switch 4 can be any applicable switch in metal-oxide-semiconductor field effect transistor or prior art, wherein:
Mainboard monitoring unit 1 one aspect is connected with server master board, it is possible to obtain the configuration information of mainboard；On the other hand mainboard monitoring unit 1 is also connected with numerical control potentiometer (XDCP) 2, by sending data signals to numerical control potentiometer 2, it is possible to the resistance value of regulation numerical control potentiometer 2.
Mainboard monitoring unit 1 can use micro-control unit (Micro Control Unit, MCU), baseboard management controller (Baseboard Management Controller can also be used, BMC), numerical control potentiometer 2 can use ISL90727, it would however also be possible to employ the numerical control potentiometer of other models.Can be connected by I2C bus between mainboard monitoring unit 1 with numerical control potentiometer 2, it is also possible to connected by System Management Bus (SMbus).When implementing, I2C bus or SMbus can also be connected by a pull-up resistor and a positive supply, such as, are connected with 3v3 positive supply.
After numerical control potentiometer 2 is connected with divider resistance R01, it is connected between the constant voltage output pin (VCAP) of power consumption monitoring chip 3 and reference voltage input pin (ISET).The resistance value scope of numerical control potentiometer 2 may be set to 10K～50K, and for improving precision, numerical control potentiometer 2 can also first be connected with divider resistance R01 after a precision resistance R02 parallel connection again.So, between the VCAP pin and ISET pin of power consumption monitoring chip 3, it is the formation of a resistive divider network, owing to the output voltage of VCAP pin is constant, by numerical control potentiometer 2 is adjusted to different resistance values, allow for ISET pin and input different size of reference voltage, be equivalent to be supplied to the reference voltage that the internal current supervisory circuit of power consumption monitoring chip 3 is different so that described internal current supervisory circuit has 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 (cut-off) of metal-oxide-semiconductor field effect transistor 4, when metal-oxide-semiconductor field effect transistor 4 is opened, motherboard power supply path turns on, during closedown, motherboard power supply path disconnects.Power consumption monitoring chip 3 is connected in motherboard power supply path, and power consumption monitoring chip 3 can use TPS2483 or ADM1276, it is of course also possible to use other kinds of power consumption monitoring chip.In Fig. 1, for VIN and VOUT is for metal-oxide-semiconductor field effect transistor 4, from the positive voltage of VIN one such as 12V of input, when metal-oxide-semiconductor field effect transistor 4 is opened, VIN=VOUT, 12V voltage enters mainboard, otherwise closes metal-oxide-semiconductor field effect transistor 4, then mainboard power-off.
Specifically, power consumption monitoring chip 3 has positive current detection input pin (SENSE_P) and negative current detection input pin (SENSE_N), SENSE_P pin is connected to power supply input, detects resistance R in can measuring motherboard power supply path by SENSE-P pin and SENSE_N pinSENSEThe voltage at two ends, and, load current can be by measuring detection resistance RSENSEOn pressure drop monitor, for RSENSEOn the pressure drop that detects, the internal current detection amplifier of power consumption monitoring chip 3 provides the gain of 50 times, internal current supervisory circuit will amplify after detection voltage compared with the reference voltage inputted from ISET pin, judge whether to occur the situation of stream according to comparative result, specifically, when the detection voltage after amplifying is more than described reference voltage, determines and stream occurred.Visible, VISET=VSENSE× 50, wherein, VISETFor the reference voltage of ISET input pin input, VSENSEFor detection voltage threshold value (have corresponding relation with current threshold, specifically, VSENSEDivided by RSENSEEqual to current threshold).It is to say, by the resistance value regulating numerical control potentiometer 2, it is possible to the reference voltage value of regulation ISET pin input, thus adjust the voltage threshold of motherboard power supply, also it is equivalent to adjust the current threshold in motherboard power supply path.
The operation principle of power consumption monitoring chip 3 such as TPS2483 or ADM1276 is referred to relevant criterion or product description, repeats no more here.
Based on being given above annexation and the operation principle of each parts of each parts, the apparatus for monitoring power supply below describing the embodiment of the present invention carries out the operation principle of overcurrent protection to mainboard electric current:
Mainboard monitoring unit 1 obtains the configuration information of mainboard; the power consumption demand of mainboard is calculated according to described configuration information; determine according to described power consumption demand and realize the target resistance values of numerical control potentiometer 2 needed for overcurrent protection; and transmit a signal to described numerical control potentiometer 2; it is described target resistance values by the resistance value adjusting of numerical control potentiometer 2, thus the reference voltage that ISET pin inputs is adjusted to the reference voltage corresponding with the current threshold needed for overcurrent protection；Mainboard electric current is monitored by power consumption monitoring chip 3, when monitoring after mainboard electric current exceedes current threshold, closes metal-oxide-semiconductor field effect transistor 4, thus cuts off motherboard power supply.
In the above-described embodiments, mainboard monitoring unit 1 can also be connected with power consumption monitoring chip 3 by I2C bus, obtains the real time power consumption of mainboard, it is possible to the real time power consumption got is supplied to data center and is managed.
The embodiment of the present invention also provides for a kind of over-current protection method.Fig. 2 is the flow chart of the over-current protection method of the embodiment of the present invention, and with reference to Fig. 2, described over-current protection method may include steps of:
Step 201: mainboard monitoring unit is connected between mainboard and numerical control potentiometer；
Step 202: after being connected with divider resistance by numerical control potentiometer, is connected between the VCAP pin of power consumption monitoring chip and ISET pin；
Alternatively, it is also possible to connect with described divider resistance again after described numerical control potentiometer and a precise resistances parallel connection.
Step 203: power consumption monitoring chip is switched such as metal-oxide-semiconductor field effect transistor by one and is connected with motherboard power supply；
Wherein, power consumption monitoring chip is connected in the power source path of mainboard, can be measured voltage or the electric current of power source path by a detection resistance.
Step 204: mainboard monitoring unit obtains the configuration information of mainboard, calculates the power consumption demand of mainboard according to described configuration information；
Mainboard monitoring unit can be MCU or BMC, MCU or BMC can identify mainboard chip Platform Type and/or platform configuration, for example, ARM platform, ATOM platform, X86-based multi processor platform or Micro-Server etc. by obtaining the ID (MB_ID) of mainboard after electrification reset.How mainboard monitoring unit obtains the configuration information of mainboard can use any known technology, such as, can be arranged by the upper pull down resistor on mainboard and identify that mainboard is X86-based or ARM framework, or, obtained by the CPLD on mainboard, CPLD can obtain CPU quantity, hard disk quantity after powering, and BMC can obtain amount of memory.Then, the power consumption demand of mainboard just can be calculated according to the hardware configuration information obtained.It is said that in general, after the hardware configuration of mainboard determines, those skilled in the art are then easy to determine power consumption demand according to this hardware configuration, such as prior art can be used to determine power consumption demand, therefore, be the most no longer described in detail.
Step 205: mainboard monitoring unit determine according to described power consumption demand realize overcurrent protection needed for the potentiometric target resistance values of numerical control, and send data signals to described numerical control potentiometer, potentiometric for described numerical control resistance value be adjusted to described target resistance values；
As previously mentioned, for power consumption monitoring chip, VISET=VSENSE× 50, wherein, VISETFor the reference voltage of ISET input pin input, VSENSEFor detecting the threshold value (having corresponding relation with current threshold) of voltage.Visible, determine that according to described power consumption demand needed for realizing overcurrent protection, the potentiometric target resistance values of numerical control specifically includes:
First, current threshold is determined according to described power consumption demand；Secondly, V is determined according to current thresholdSENSEValue；Then, according to VSENSEValue determines VISETValue；Finally, due to the magnitude of voltage of VCAP pin output is fixing, according to this fixing magnitude of voltage and required VISETValue, it is possible to determine the potentiometric target resistance values of numerical control in resitstance voltage divider (be made up of the divider resistance R01 in Fig. 1, or, be made up of the divider resistance R01 in Fig. 1, precision resistance R02 and numerical control potentiometer) with numerical control potentiometer.
After determining the potentiometric target resistance values of numerical control, it is target resistance values that MCU or BMC then can arrange the potentiometric resistance value of described numerical control by I2C bus.
Step 206: the electric current of mainboard is monitored by power consumption monitoring chip, when monitoring after mainboard electric current exceedes current threshold, closes described metal-oxide-semiconductor field effect transistor, thus cuts off motherboard power supply.
One of the apparatus for monitoring power supply of the embodiment of the present invention given below implements.
Fig. 3 is the physical circuit figure of the apparatus for monitoring power supply of the embodiment of the present invention, as shown in Figure 3:
BMC/MCU is connected with numerical control potentiometer (XDCP), specifically, it it is the SCL pin being connected to XDCP by clock line XDCP_SCL, the SDA pin of XDCP it is connected to by data wire XDCP_SDA, it addition, clock line and data wire are connected with 3V3 positive supply (p_3V3) by a pull-up resistor the most respectively.
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, it addition, the ISET pin of power consumption monitoring chip is additionally attached between the two resistance.
The SENSE_P pin of power consumption monitoring chip is connected with the SENSE+ in power source path, and SENSE_N pin is connected with the SENSE-in current path, it is possible to measure the voltage detecting resistance two ends in 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 monitored in power source path exceedes current threshold, output corresponding signal is to the grid of metal-oxide-semiconductor field effect transistor, close metal-oxide-semiconductor field effect transistor, metal-oxide-semiconductor field effect transistor no current exports, i.e. pVCC_IN does not export, thus has cut off motherboard power supply.
In sum; the embodiment of the present invention is by obtaining the configuration information of mainboard; the power consumption demand of mainboard is calculated according to described configuration information; and according to the power consumption demand potentiometric resistance value of self-adaptative adjustment numerical control; be equivalent to the adaptive current threshold that overcurrent protection is set and meet the different mainboard demand to power consumption, it is achieved that carry out, by same protection circuit, the chip platform that self adaptation is different, so; avoid the need for doing different designs for different platforms, such that it is able to reduce development time and development cost
It should be noted that, can perform in the computer system being such as provided with one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although showing logical order in flow charts, but in some cases, can be to be different from the step shown or described by order execution herein.Additionally, those skilled in the art should be understood that, each module of the above-mentioned present invention or each step can realize with general calculating device, they can concentrate on single calculating device, or it is distributed on the network that multiple calculating device is formed, alternatively, they can realize with calculating the executable program code of device, thus, can be stored in storing in device and be performed by calculating device, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit module realize.So, the present invention is not restricted to the combination of any specific hardware and software.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, within should be included in the scope of protection of the invention.
Claims (8)
1. an apparatus for monitoring power supply, it is characterised in that include mainboard monitoring unit, numerical control potentiometer, power consumption monitoring chip and switch, wherein:
After connecting with a divider resistance again after described numerical control potentiometer and a precise resistances parallel connection, it is connected between the constant voltage output pin VCAP of described power consumption monitoring chip and reference voltage input pin ISET；
Described mainboard monitoring unit is connected with server master board, for obtaining the configuration information of mainboard, the power consumption demand of mainboard is calculated according to described configuration information, the potentiometric target resistance values of numerical control needed for realizing overcurrent protection is determined according to described power consumption demand, and send data signals to described numerical control potentiometer, it is described target resistance values by potentiometric for described numerical control resistance value adjusting, thus the reference voltage that ISET pin inputs is adjusted to the reference voltage corresponding with the current threshold needed for overcurrent protection, wherein, described mainboard monitoring unit is micro-control unit MCU or baseboard management controller BMC；
Described power consumption monitoring chip is connected with motherboard power supply by described switch, when monitoring after mainboard electric current exceedes current threshold, closes described switch, thus cuts off motherboard power supply.
2. apparatus for monitoring power supply as claimed in claim 1, it is characterised in that:
Described switch is metal-oxide-semiconductor field effect transistor.
3. apparatus for monitoring power supply as claimed in claim 2, it is characterised in that:
Described mainboard monitoring unit identifies the ID of mainboard automatically, is obtained the configuration information of mainboard by the ID of mainboard；
Described mainboard monitoring unit is further used for: determine the current threshold needed for overcurrent protection according to described power consumption demand, determines the potentiometric target resistance values of numerical control according to described current threshold.
4. apparatus for monitoring power supply as claimed in claim 2, it is characterised in that:
Described numerical control potentiometer uses ISL90727, and described power consumption monitoring chip uses TPS2483 or ADM1276.
5. apparatus for monitoring power supply as claimed in claim 2, it is characterised in that:
Described mainboard monitoring unit is micro-control unit MCU or baseboard management controller BMC；It is connected by I2C bus or System Management Bus SMbus between described mainboard monitoring unit with described numerical control potentiometer.
6. apparatus for monitoring power supply as claimed in claim 2, it is characterised in that described mainboard monitoring unit is further used for:
Current threshold is determined according to described power consumption demand；The ohmically voltage threshold of detection is determined according to current threshold；The reference voltage level of ISET pin is determined according to voltage threshold；The reference voltage level of fixed voltage value and required ISET pin according to the output of VCAP pin and the resistance of described divider resistance, determine the potentiometric target resistance values of numerical control.
7. an over-current protection method, it is characterised in that including:
After connecting with divider resistance again after numerical control potentiometer and a precise resistances parallel connection, it is connected between the constant voltage output pin VCAP of power consumption monitoring chip and reference voltage input pin ISET；
Power consumption monitoring chip is connected with motherboard power supply by switch；
Micro-control unit MCU or baseboard management controller BMC is utilized to obtain the configuration information of mainboard; the power consumption demand of mainboard is calculated according to described configuration information; the potentiometric target resistance values of numerical control needed for realizing overcurrent protection is determined according to described power consumption demand; and be described target resistance values by potentiometric for described numerical control resistance value adjusting, thus the reference voltage that ISET pin inputs is adjusted to the reference voltage corresponding with the current threshold needed for overcurrent protection；
After power consumption monitoring chip monitoring exceedes current threshold to mainboard electric current, close described switch, thus cut off motherboard power supply.
8. over-current protection method as claimed in claim 7, it is characterised in that:
Described switch is metal-oxide-semiconductor field effect transistor.
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| US6754092B2 (en) * | 2002-06-27 | 2004-06-22 | International Business Machines Corporation | Method and apparatus for reducing power consumption for power supplied by a voltage adapter |
| CN102299629A (en) * | 2011-09-01 | 2011-12-28 | 东华理工大学 | Power supply control method and power supply device for direct-current high-voltage power supply |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846729A (en) * | 2009-03-27 | 2010-09-29 | 上海松下微波炉有限公司 | Method and device for detecting overvoltage of power supply |
| CN102478606A (en) * | 2010-11-26 | 2012-05-30 | 鸿富锦精密工业（深圳）有限公司 | Overcurrent protection resistance detection circuit for voltage-reduction transfer circuit |
| CN102609065A (en) * | 2011-01-19 | 2012-07-25 | 鸿富锦精密工业（深圳）有限公司 | Over-current protection device |
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