CN111934301A - High-power hot plug control circuit and method - Google Patents
High-power hot plug control circuit and method Download PDFInfo
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- CN111934301A CN111934301A CN202010686501.5A CN202010686501A CN111934301A CN 111934301 A CN111934301 A CN 111934301A CN 202010686501 A CN202010686501 A CN 202010686501A CN 111934301 A CN111934301 A CN 111934301A
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- plug control
- hot plug
- control chip
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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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
- G01R19/16533—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 application
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/005—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection avoiding undesired transient conditions
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a high-power hot plug control circuit and a method, relating to the technical field of control circuits; the method comprises the steps of building a high-power hot plug control circuit, wherein the high-power hot plug control circuit comprises a hot plug control chip, a parallel precise resistor set, a parallel MOSFET set, a current detection signal and a main current path, the current detection signal and the main current path are connected to SENSE +/SENSE-of the hot plug control chip in a Kelvin connection mode, meanwhile, the parallel precise resistor set is connected with an MOS switch set, the parallel MOS switches are uniformly controlled by the hot plug control chip, and the hot plug control chip inhibits surge current by controlling the states of the MOS switches.
Description
Technical Field
The invention discloses a circuit and a method, relates to the technical field of power supply control circuits, and particularly relates to a high-power hot plug control circuit and a method.
Background
The hot plug circuit aims at limiting surge current at the moment of plugging and unplugging a module or a board card, and generally comprises a control chip, an external precision detection resistor RSENSE and an MOSFET. The module or board card power supply current is converted into detection voltage through the detection resistor, the control chip detects voltage difference between two sides of RSENSE in real time and compares the voltage difference with an internal threshold value VTH, the working state of the MOSFET is adjusted according to a comparison result, and surge current is restrained.
However, in a high-power and high-reliability system, the working current of a power supply node or unit can reach more than 100A, the internal threshold value VTH of a general hot-plug control chip does not exceed 50mV, a precision resistor with an extremely low resistance value as low as below 0.5m omega is required, the detection precision design difficulty is very high, and the problems of power consumption and heating of the detection resistor under a high-current condition are serious, which brings certain difficulties to component selection and parameter design of a hot-plug control circuit.
Disclosure of Invention
Aiming at the problems of the prior art, the invention provides a high-power hot plug control circuit and a method thereof, aiming at the large current detection of a high-power module or a board card, the invention utilizes the parallel connection mode of a plurality of precise detection resistors to reduce the resistance value of an equivalent detection resistor, improve the detectable current amplitude and reduce the power consumption of a sampling resistor, and can be applied to the power supply design of a high-power and high-reliability system.
The specific scheme provided by the invention is as follows:
a high-power hot plug control method comprises the following steps: a high-power hot plug control circuit is built, the high-power hot plug control circuit comprises a hot plug control chip, a parallel precise resistor set, a current detection signal and a main current channel,
the current detection signal and the main current path are connected to SENSE +/SENSE-of the hot plug control chip in a Kelvin connection mode, meanwhile, the parallel connection precision resistor group is connected with the parallel connection MOSFET group, the parallel connection MOS switches are uniformly controlled by the hot plug control chip,
the hot plug control chip inhibits surge current by controlling the state of the MOS switch.
In the high-power hot plug control method, at the moment of power-on, the hot plug control chip controls the MOS switches to be in a semi-conducting state, and limits the SENSE +/SENSE-inter-detection voltage to be within the maximum voltage threshold of the internal current-limiting comparator set by the hot plug control chip, so that the surge current is inhibited from not exceeding the maximum detection current limit value.
In the high-power hot plug control method, when a rear-stage circuit of the high-power hot plug control circuit has a short-circuit fault, the hot plug control chip controls the MOS switches to be in a semi-conducting state or a closing state in a linear working area, and the SENSE +/SENSE-inter detection voltage is limited to be within a maximum voltage threshold of an internal current-limiting comparator set by the hot plug control chip, so that surge current is inhibited from not exceeding a maximum detection current limit value.
In the high-power hot plug control method, after the capacitor of the rear-stage circuit of the high-power hot plug control circuit is charged, the hot plug control chip controls the MOS switches to be in a full conduction state to supply power to the rear-stage circuit.
A high-power hot plug control circuit comprises a hot plug control chip, a parallel precise resistor set, a current detection signal and a main current path,
the current detection signal and the main current path are connected to SENSE +/SENSE-of the hot plug control chip in a Kelvin connection mode, meanwhile, the parallel connection precision resistor group is connected with the parallel connection MOSFET group, the parallel connection MOS switches are uniformly controlled by the hot plug control chip,
the hot plug control chip inhibits surge current by controlling the state of the MOS switch.
The maximum voltage threshold of the internal current limiting comparator is set inside the hot plug control chip in the high-power hot plug control circuit.
The maximum detection current limit value is determined by the maximum voltage threshold value and the resistance value of the parallel precise resistor set in the high-power hot plug control circuit.
A high-power hot plug control module comprises the high-power hot plug control circuit.
The invention has the advantages that:
the invention provides a high-power hot plug control circuit and a method, which reduce the resistance value of equivalent detection resistors through parallel connection of precision resistors, reduce errors of detection signals of each group due to device precision and design difference by connecting detection signals of all detection resistors to a hot plug control chip through Kelvin, ensure the detection precision and realize the detection of large current of more than one hundred amperes and high-power hot plug control.
Drawings
FIG. 1 is a schematic diagram of the circuit connection of the present invention.
Detailed Description
Hot Plug (Hot-Plug or Hot-Swap), i.e. live Plug, means that in a computing, storing or communication system, a module and a board card are plugged into or pulled out of the system without interrupting the normal operation of the system under the condition of not shutting down the power supply of the system, thereby improving the reliability, the quick maintainability, the redundancy and the timely recovery capability to disasters of the system, and being a necessary function of a highly reliable electronic system.
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
The invention provides a high-power hot plug control method, which comprises the following steps: a high-power hot plug control circuit is built, the high-power hot plug control circuit comprises a hot plug control chip, a parallel precise resistor set, a current detection signal and a main current channel,
the current detection signal and the main current path are connected to SENSE +/SENSE-of the hot plug control chip in a Kelvin connection mode, meanwhile, the parallel connection precision resistor group is connected with the parallel connection MOSFET group, the parallel connection MOS switches are uniformly controlled by the hot plug control chip,
the hot plug control chip inhibits surge current by controlling the state of the MOS switch.
The hot plug circuit aims at limiting surge current at the moment of plugging and unplugging a module or a board card, and consists of a hot plug control chip, an external precision detection resistor RSENSE and a MOSFET (metal-oxide-semiconductor field effect transistor).
In an embodiment of the method of the present invention, the method can be applied to a power supply unit of a node subsystem of a distributed storage system of a certain complete equipment cabinet, and referring to fig. 1, U1 is a hot-plug control chip; RS1-RS4 are parallel detection resistors, detection signals and a main current path adopt a Kelvin connection mode, and are connected with a chip SENSE +/SENSE-through average resistors RA1-RA 8; the MOS1-MOS4 are parallel MOSFETs, are controlled by a control chip U1 in a unified way, perform the surge current suppression function,
wherein the U1 internal current limit comparator threshold VTH is 25mV maximum; RS1-RS4 are 2512 packaged precision resistors, and the resistance value is 0.75m omega; average resistances RA1-RA8 are omega-level resistances, generally 10 omega, and the maximum detection current limit is as follows:
IMAX＝25mV/0.75mΩ/4＝133A
if the maximum working current of the node subsystem is 100A, the power consumption of each sampling resistor is as the following formula, and if the power consumption is less than the 2512 packaging resistor power consumption limit value of 1W, P isRSENSE＝25A*25A*0.75mΩ＝0.469W，
The hot plug control circuit works as follows: at the moment that the node is inserted into the cabinet, because a rear-stage circuit is provided with a large number of filter capacitors, the power-on moment is equivalent to short circuit, and surge current far greater than normal working current is generated, at the moment, U1 controls MOS1-MOS4 to be in a linear working area semi-conducting state, and the SENSE +/SENSE-inter-detection voltage VSENSE is limited to 25mV, namely, the surge current is restrained to be not more than 133A;
after the rear-stage capacitor is charged, the surge current is rapidly reduced, the circulating current is normal working current at the moment, VSENSE is less than 25mV, and MOS1-MOS4 are completely conducted to supply power for a rear-stage circuit;
if the rear-stage circuit has a short-circuit fault, the circulating current is increased, the SENSE +/SENSE-detects that VSENSE rises to 25mV, and the U1 controls the MOS1-MOS4 to be semi-conductive and even closed, so that the short-circuit current is inhibited from exceeding 133A, and the burning of the rear-stage circuit and the system power failure are avoided.
Verification proves that the design can meet the requirements of surge current suppression at the moment of plugging and unplugging the node subsystem and continuous and reliable power supply under a normal working state.
The invention also provides a high-power hot plug control circuit, which comprises a hot plug control chip, a parallel precise resistor set, a current detection signal and a main current channel,
the current detection signal and the main current path are connected to SENSE +/SENSE-of the hot plug control chip in a Kelvin connection mode, meanwhile, the parallel connection precision resistor group is connected with the parallel connection MOSFET group, the parallel connection MOS switches are uniformly controlled by the hot plug control chip,
the hot plug control chip inhibits surge current by controlling the state of the MOS switch.
The circuit application and the method embodiment of the present invention are based on the same concept, and specific contents can be referred to the description of the method embodiment of the present invention, and are not described herein again.
The invention also provides a high-power hot plug control module which comprises the high-power hot plug control circuit.
The module can be applied to equipment needing hot plugging, the surge current at the moment of plugging and unplugging the module or a board card is limited, the module or the board card consists of a hot plugging control chip, an external precise detection resistor RSENSE and a MOSFET, the resistance value of the equivalent detection resistor is reduced by connecting the parallel precise resistors, detection signals of all the detection resistors are connected to the hot plugging control chip through Kelvin, errors of all groups of detection signals caused by device precision and design difference can be reduced, and the detection precision is ensured.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (8)
1. A high-power hot plug control method is characterized in that a high-power hot plug control circuit is built, the high-power hot plug control circuit comprises a hot plug control chip, a parallel precise resistor group, a parallel MOSFET group, a current detection signal and a main current channel,
the current detection signal and the main current path are connected to SENSE +/SENSE-of the hot plug control chip in a Kelvin connection mode, meanwhile, the parallel connection precision resistor group is connected with the parallel connection MOSFET group, the parallel connection MOS switches are uniformly controlled by the hot plug control chip,
the hot plug control chip inhibits surge current by controlling the state of the MOS switch.
2. A high power hot plug control method as claimed in claim 1, wherein at power-on instant, the hot plug control chip controls the MOS switches to be in a semi-conducting state, and limits the SENSE +/SENSE-inter-SENSE detection voltage to the maximum threshold of the internal current-limiting comparator voltage set by the hot plug control chip, so as to prevent the surge current from exceeding the maximum detection current limit.
3. The method as claimed in claim 1, wherein when a short circuit fault occurs in a subsequent circuit of the high-power hot plug control circuit, the hot plug control chip controls the MOS switches to be in a linear operating region semi-conducting state or a closed state, and limits the SENSE +/SENSE-inter detection voltage to a maximum threshold of an internal current-limiting comparator voltage set by the hot plug control chip, so as to prevent the inrush current from exceeding a maximum detection current limit.
4. The power hot plug control circuit according to claim 1, wherein when the capacitor of the subsequent circuit of the power hot plug control circuit is charged, the hot plug control chip controls the MOS switches to be in a fully conducting state to supply power to the subsequent circuit.
5. A high-power hot plug control circuit is characterized by comprising a hot plug control chip, a parallel precise resistor group, a parallel MOSFET group, a current detection signal and a main current channel,
the current detection signal and the main current path are connected to SENSE +/SENSE-of the hot plug control chip in a Kelvin connection mode, meanwhile, the parallel connection precision resistor group is connected with the parallel connection MOSFET group, the parallel connection MOS switches are uniformly controlled by the hot plug control chip,
the hot plug control chip inhibits surge current by controlling the state of the MOS switch.
6. The power hot plug control circuit according to claim 5, wherein the internal current limiting comparator voltage maximum threshold is set inside the hot plug control chip.
7. A high power hot plug control circuit according to claim 5 or 6, wherein the maximum detection current limit is determined by the maximum voltage threshold and the resistance of the parallel precision resistor set.
8. A high power hot-plug control module comprising a high power hot-plug control circuit according to any one of claims 5 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010686501.5A CN111934301A (en) | 2020-07-16 | 2020-07-16 | High-power hot plug control circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010686501.5A CN111934301A (en) | 2020-07-16 | 2020-07-16 | High-power hot plug control circuit and method |
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| CN111934301A true CN111934301A (en) | 2020-11-13 |
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| CN202010686501.5A Pending CN111934301A (en) | 2020-07-16 | 2020-07-16 | High-power hot plug control circuit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204516A (en) * | 2021-12-15 | 2022-03-18 | 惠州视维新技术有限公司 | PMIC protection circuit and display device |
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| CN101741575A (en) * | 2009-12-25 | 2010-06-16 | 浪潮电子信息产业股份有限公司 | 220A/12V direct current hot plug soft start device |
| CN103268144A (en) * | 2013-06-07 | 2013-08-28 | 张宁 | Power monitoring device and overcurrent protection method |
| CN106129980A (en) * | 2016-06-30 | 2016-11-16 | 山东超越数控电子有限公司 | A kind of hot-swappable circuit with Power Limitation function |
| CN106443159A (en) * | 2016-09-12 | 2017-02-22 | 上海兴工微电子有限公司 | Current detection chip |
| CN107728695A (en) * | 2017-10-30 | 2018-02-23 | 郑州云海信息技术有限公司 | A kind of method and system for realizing that hot plug line current is balanced |
| CN108964433A (en) * | 2018-06-28 | 2018-12-07 | 北京航天自动控制研究所 | A kind of overall process Inrush current restraining generalization device and control method based on PWM closed-loop control |
| CN208820754U (en) * | 2018-09-26 | 2019-05-03 | 上海云衡科技有限公司 | Switching circuit of power supply |
| CN111313874A (en) * | 2020-03-18 | 2020-06-19 | 上海海事大学 | Current detection device for SiC MOSFET and short-circuit protection method |
-
2020
- 2020-07-16 CN CN202010686501.5A patent/CN111934301A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741575A (en) * | 2009-12-25 | 2010-06-16 | 浪潮电子信息产业股份有限公司 | 220A/12V direct current hot plug soft start device |
| CN103268144A (en) * | 2013-06-07 | 2013-08-28 | 张宁 | Power monitoring device and overcurrent protection method |
| CN106129980A (en) * | 2016-06-30 | 2016-11-16 | 山东超越数控电子有限公司 | A kind of hot-swappable circuit with Power Limitation function |
| CN106443159A (en) * | 2016-09-12 | 2017-02-22 | 上海兴工微电子有限公司 | Current detection chip |
| CN107728695A (en) * | 2017-10-30 | 2018-02-23 | 郑州云海信息技术有限公司 | A kind of method and system for realizing that hot plug line current is balanced |
| CN108964433A (en) * | 2018-06-28 | 2018-12-07 | 北京航天自动控制研究所 | A kind of overall process Inrush current restraining generalization device and control method based on PWM closed-loop control |
| CN208820754U (en) * | 2018-09-26 | 2019-05-03 | 上海云衡科技有限公司 | Switching circuit of power supply |
| CN111313874A (en) * | 2020-03-18 | 2020-06-19 | 上海海事大学 | Current detection device for SiC MOSFET and short-circuit protection method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114204516A (en) * | 2021-12-15 | 2022-03-18 | 惠州视维新技术有限公司 | PMIC protection circuit and display device |
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Application publication date: 20201113 |
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