CN110995221B - Hot plug turn-off circuit and server power supply system - Google Patents
Hot plug turn-off circuit and server power supply system Download PDFInfo
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- CN110995221B CN110995221B CN201911117098.8A CN201911117098A CN110995221B CN 110995221 B CN110995221 B CN 110995221B CN 201911117098 A CN201911117098 A CN 201911117098A CN 110995221 B CN110995221 B CN 110995221B
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- 239000003990 capacitor Substances 0.000 claims abstract description 58
- 230000004044 response Effects 0.000 claims abstract description 9
- 230000005669 field effect Effects 0.000 claims description 20
- 229910044991 metal oxide Inorganic materials 0.000 claims description 19
- 150000004706 metal oxides Chemical class 0.000 claims description 19
- 239000004065 semiconductor Substances 0.000 claims description 19
- 230000000630 rising effect Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003071 parasitic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
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Abstract
The invention discloses a hot plug turn-off circuit, which comprises the following components: the drain electrode of the MOSFET is connected with input voltage, and the source electrode of the MOSFET is connected with output voltage; the hot plug chip comprises a grid driving pin and a voltage slope control pin, wherein the grid driving pin is connected with the grid of the MOSFET, and the voltage slope control pin is connected with the grid driving pin; the first end of the first capacitor is connected with the voltage slope control pin, and the second end of the first capacitor is grounded; the hot swap chip is configured to disconnect the voltage slope control pin and the gate driving pin in response to the current signal received by the gate driving pin being greater than a threshold value. The invention also discloses a server power supply system. The hot plug turn-off circuit and the server power supply system avoid the influence of the first capacitor by disconnecting the connection of the voltage slope control pin and the grid driving pin, thereby accelerating the turn-off speed.
Description
Technical Field
The present invention relates to the field of hot plug, and more particularly, to a hot plug shutdown circuit, device and readable medium.
Background
Along with the development of big data technology, the requirement on the reliability of the server is higher and higher, the Hot Swap line can play an effective protection role on a server power supply system, when the current flowing through the Hot Swap line is too large and exceeds a protection point set by the Hot Swap, the Hot Swap line can be powered off, and the situation that the rear-end server is burnt due to short circuit is avoided.
In the prior art, a capacitor with a certain capacitance value is added to a Gate of a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), and the rising speed of a rear-end output voltage can be controlled by the capacitance value of the capacitor. When the capacitance value is small, the voltage between GS (gate source) of the MOSFET rises fast, the charging speed of the load capacitor is fast, the voltage between GS of the MOSFET rises fast, when the capacitance value is large, the charging speed of the load capacitor is slow, and the output voltage rises slowly. Although the capacitor connected with the Gate can control the rising speed of the rear-end output voltage, when the current flowing through the MOSFET is too large and the MOSFET needs to be cut off in time for protection, the Gate discharging speed of the MOSFET is reduced due to the capacitor, the MOSFET turn-off speed is reduced, and the risk that the protection effect cannot be achieved exists.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide a hot swap shutdown circuit and a server power supply system, which avoid the influence of a first capacitor by disconnecting a voltage slope control pin and a gate driving pin, so as to accelerate a shutdown speed.
In view of the foregoing, an aspect of the embodiments of the present invention provides a hot swap shutdown circuit, including the following components:
the drain electrode of the metal oxide semiconductor field effect transistor is connected with input voltage, and the source electrode of the metal oxide semiconductor field effect transistor is connected with output voltage;
the hot plug chip comprises a grid driving pin and a voltage slope control pin, wherein the grid driving pin is connected with the grid of the metal oxide semiconductor field effect transistor, and the voltage slope control pin is connected with the grid driving pin;
a first end of the first capacitor is connected with the voltage slope control pin, and a second end of the first capacitor is grounded;
the hot swap chip is configured to disconnect the voltage slope control pin and the gate driving pin in response to a current signal received by the gate driving pin being greater than a threshold value.
In some embodiments, a load capacitor is further included, the load capacitor being connected in parallel with the load.
In some embodiments, the first capacitor is configured to control a voltage between the gate and the source of the mosfet to maintain a constant current to charge the load capacitor.
In some embodiments, the hot-pluggable chip is configured to set an output voltage ramp rate based on the charging current and the magnitude of the first capacitance such that the output voltage rises at a constant speed.
In some embodiments, the hot swap chip is configured to determine whether an output voltage reaches an input voltage, and disconnect the voltage slope control pin and the gate driving pin based on a yes determination.
In another aspect of the embodiments of the present invention, a server power supply system is further provided, which includes a power supply and a hot plug shutdown circuit, where the hot plug shutdown circuit includes:
the drain electrode of the metal oxide semiconductor field effect transistor is connected with input voltage, and the source electrode of the metal oxide semiconductor field effect transistor is connected with output voltage;
the hot plug chip comprises a grid driving pin and a voltage slope control pin, wherein the grid driving pin is connected with the grid of the metal oxide semiconductor field effect transistor, and the voltage slope control pin is connected with the grid driving pin;
a first end of the first capacitor is connected with the voltage slope control pin, and a second end of the first capacitor is grounded;
the hot swap chip is configured to disconnect the voltage slope control pin and the gate driving pin in response to a current signal received by the gate driving pin being greater than a threshold value.
In some embodiments, the hot swap shutdown circuit further comprises a load capacitor connected in parallel with the load.
In some embodiments, the first capacitor is configured to control a voltage between the gate and the source of the mosfet to maintain a constant current to charge the load capacitor.
In some embodiments, the hot-pluggable chip is configured to set an output voltage ramp rate based on the charging current and the magnitude of the first capacitance such that the output voltage rises at a constant speed.
In some embodiments, the hot swap chip is configured to determine whether an output voltage reaches an input voltage, and disconnect the voltage slope control pin and the gate driving pin based on a yes determination.
The invention has the following beneficial technical effects: when the output voltage of the rear end can be controlled to be slowly raised and when the current of the rear end is too large and needs to be protected, the influence of the first capacitor is avoided by disconnecting the connection of the voltage slope control pin and the grid drive pin, so that the turn-off speed is accelerated.
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. 1 is a schematic diagram of an embodiment of a hot plug shutdown circuit provided in the present invention.
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.
It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.
In view of the above, a first aspect of the embodiments of the present invention provides an embodiment of a hot swap shutdown circuit. Fig. 1 is a schematic diagram illustrating an embodiment of a hot plug shutdown circuit provided in the present invention. As shown in fig. 1, an embodiment of the present invention includes the following components:
the MOS field effect transistor M comprises a grid G, a drain D and a source S, wherein the drain D is connected with an input voltage Vin, and the source S is connected with an output voltage Vout;
the hot plug chip IC comprises a gate driving pin Y1 and a voltage slope control pin Y2, wherein the gate driving pin Y1 is connected with the gate G, and the voltage slope control pin Y2 is connected with the gate driving pin Y1;
a first capacitor C1, a first end of the first capacitor C1 is connected to the voltage slope control pin Y2, and a second end of the first capacitor C1 is grounded;
wherein the hot-swap chip IC is configured to disconnect the voltage slope control pin Y1 from the gate drive pin Y2 in response to the current signal received by the gate drive pin being greater than a threshold value (i.e., the MOSFET M needs to be turned off).
When the GS voltage of the MOSFET M reaches a threshold value, the MOSFET M is turned on, and the drain-source electrode (DS) is connected, and correspondingly, when the GS voltage is reduced below the threshold value, the MOSFET M is turned off. The DVDT (voltage slope control pin Y2), which sets the output voltage ramp rate, is connected to the Gate Driver (voltage slope control pin Y1) only in the start-up mode. The internal connection enables the output voltage ramp rate to be mainly determined by the external capacitor of the DVDT and the charging current of the DVDT to the capacitor. After the start is finished, the DVDT is disconnected with the Gate Driver, when a back-end fault needs to turn off the metal oxide semiconductor field effect transistor M, only the GATE parasitic capacitance of the metal oxide semiconductor field effect transistor M needs to be discharged, the GATE level parasitic capacitance is small, the metal oxide semiconductor field effect transistor M can be rapidly turned off during discharging, the turn-off response speed of the fault can be reduced by the capacitive load of the GATE, and the recovery speed under the transient condition is reduced. Before any subsequent start event, the DVDT is reconnected to GATE, resuming the normal start-up flow.
In some embodiments, the hot swap shutdown circuit further comprises a load capacitor C2, and the load capacitor C2 is connected in parallel with the load R2. The rising speed of the output voltage Vout is proportional to the charging speed of the load capacitor C2, and the faster the load capacitor C2 is charged, the faster the rising speed of the output voltage Vout is.
In some embodiments, the first capacitor C1 is configured to control a voltage between the gate G and the source S of the mosfet M to maintain a constant current to charge the load capacitor. When the capacitance value of the first capacitor C1 is small, the GS voltage of the mosfet M rises faster, the load capacitor C2 charges faster, and the output voltage rises faster. The capacitor C1 connected to the DVDT is the voltage that controls the GS, and differences in GS voltage cause differences in the impedance between DS, with higher impedances leading to lower currents. By controlling the voltage of GS, the load capacitor C2 is controlled to be charged with a constant current.
In some embodiments, the hot-pluggable chip is configured to set the output voltage ramp rate based on the charging current and the magnitude of the first capacitor C1 such that the output voltage rises at a constant speed. When the capacitor is charged, the formula IT is CV, I represents charging current, T represents time, C represents the size of the first capacitor, V represents output voltage, C and V are both constant, the voltage ramp rate V/T is I/C, the output voltage Vout rises at a constant speed, and when the output voltage Vout rises to be equal to the input voltage Vin, the output voltage Vout does not rise any more, which indicates that the startup is completed.
In some embodiments, the hot-swap chip IC is configured to determine whether the output voltage Vout reaches the input voltage Vin. In response to the output voltage reaching the input voltage, the connection of the voltage slope control pin Y1 and the gate drive pin Y2 is disconnected.
In some embodiments, the hot swap shutdown circuit further includes a first resistor R1, and the first resistor R1 is connected in series with the first capacitor C1. The charging current of the hot swap chip IC is generally constant, and the first resistor R1 connected in series with the DVDT mainly influences the discharging speed of the capacitor.
In some embodiments, the hot swap shutdown circuit further includes a second resistor R3, and the second resistor R3 is connected in series with the voltage slope control pin Y1.
The time Tstart and the surge current Iinrush of the whole starting process are required to meet the SOA (Safe Operation Area) of the mosfet M, because the mosfet M has a large impedance in the starting process, a certain power loss is generated by the current, and the power loss exceeds the SOA, so that the mosfet M is burnt.
The DVDT pin sets the output voltage ramp rate, which is internally connected to the GATE pin during power-up, with the internal connection being such that the output voltage ramp rate is determined primarily by the external capacitance of the DVDT and the magnitude of the charging current. After power-up is complete, the DVDT pin is disconnected from the GATE pin and connected to VOUT to prevent blocking the GATE off time. The embodiment of the invention can prevent unnecessary GATE capacitive load, can quickly turn off the MOSFET when the back end needs protection, and can recover the normal flow when restarting.
In view of the above, a second aspect of the embodiments of the present invention provides a server power supply system, which includes a power supply and a hot plug shutdown circuit, where the hot plug shutdown circuit includes:
the drain electrode of the metal oxide semiconductor field effect transistor is connected with input voltage, and the source electrode of the metal oxide semiconductor field effect transistor is connected with output voltage;
the hot plug chip comprises a grid driving pin and a voltage slope control pin, wherein the grid driving pin is connected with the grid of the metal oxide semiconductor field effect transistor, and the voltage slope control pin is connected with the grid driving pin;
a first end of the first capacitor is connected with the voltage slope control pin, and a second end of the first capacitor is grounded;
the hot swap chip is configured to disconnect the voltage slope control pin and the gate driving pin in response to a current signal received by the gate driving pin being greater than a threshold value.
In some embodiments, the hot swap shutdown circuit further comprises a load capacitor connected in parallel with the load.
In some embodiments, the first capacitor is configured to control a voltage between the gate and the source of the mosfet to maintain a constant current to charge the load capacitor.
In some embodiments, the hot-pluggable chip is configured to set an output voltage ramp rate based on the charging current and the magnitude of the first capacitance such that the output voltage rises at a constant speed.
In some embodiments, the hot swap chip is configured to determine whether an output voltage reaches an input voltage, and disconnect the voltage slope control pin and the gate driving pin based on a yes determination.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the present disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The numbers of the embodiments disclosed in the embodiments of the present invention are merely for description, and do not represent the merits of the embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant only to be exemplary, and is not intended to intimate that the scope of the disclosure, including the claims, is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements and the like that may be made without departing from the spirit or scope of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.
Claims (10)
1. A hot swap shutdown circuit, comprising:
the drain electrode of the metal oxide semiconductor field effect transistor is connected with input voltage, and the source electrode of the metal oxide semiconductor field effect transistor is connected with output voltage;
the hot plug chip comprises a grid driving pin and a voltage slope control pin, wherein the grid driving pin is connected with the grid of the metal oxide semiconductor field effect transistor, and the voltage slope control pin is connected with the grid driving pin;
a first end of the first capacitor is connected with the voltage slope control pin, and a second end of the first capacitor is grounded;
the hot swap chip is configured to disconnect the voltage slope control pin and the gate driving pin in response to a current signal received by the gate driving pin being greater than a threshold value.
2. The hot plug shutdown circuit of claim 1, further comprising a load capacitor connected in parallel with the load.
3. The hot plug shutdown circuit of claim 2, wherein the first capacitor is configured to control a voltage between the gate and the source of the mosfet to maintain a constant current to charge the load capacitor.
4. The hot plug shutdown circuit of claim 3, wherein the hot plug chip is configured to set an output voltage ramp rate based on the charging current and a magnitude of the first capacitance to cause the output voltage to rise at a constant speed.
5. The circuit of claim 4, wherein the hot swap chip is configured to determine whether an output voltage reaches an input voltage and disconnect the voltage slope control pin and the gate driver pin based on a yes determination.
6. A server power supply system, comprising a power supply and a hot-plug shutdown circuit, wherein the hot-plug shutdown circuit comprises:
the drain electrode of the metal oxide semiconductor field effect transistor is connected with input voltage, and the source electrode of the metal oxide semiconductor field effect transistor is connected with output voltage;
the hot plug chip comprises a grid driving pin and a voltage slope control pin, wherein the grid driving pin is connected with the grid of the metal oxide semiconductor field effect transistor, and the voltage slope control pin is connected with the grid driving pin;
a first end of the first capacitor is connected with the voltage slope control pin, and a second end of the first capacitor is grounded;
the hot swap chip is configured to disconnect the voltage slope control pin and the gate driving pin in response to a current signal received by the gate driving pin being greater than a threshold value.
7. The server power supply system of claim 6, wherein the hot swap shutdown circuit further comprises a load capacitor connected in parallel with the load.
8. The server power supply system of claim 7, wherein the first capacitor is configured to control a voltage between a gate and a source of the mosfet to maintain a constant current to charge the load capacitor.
9. The server power supply system of claim 8, wherein the hot swap chip is configured to set an output voltage ramp rate based on the charging current and a size of the first capacitor such that the output voltage rises at a constant rate.
10. The server power supply system according to claim 9, wherein the hot swap chip is configured to determine whether an output voltage reaches an input voltage, and disconnect the voltage slope control pin and the gate driving pin based on a yes determination.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911117098.8A CN110995221B (en) | 2019-11-15 | 2019-11-15 | Hot plug turn-off circuit and server power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911117098.8A CN110995221B (en) | 2019-11-15 | 2019-11-15 | Hot plug turn-off circuit and server power supply system |
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| CN110995221A CN110995221A (en) | 2020-04-10 |
| CN110995221B true CN110995221B (en) | 2022-06-07 |
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| CN201911117098.8A Active CN110995221B (en) | 2019-11-15 | 2019-11-15 | Hot plug turn-off circuit and server power supply system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113437736A (en) * | 2021-05-31 | 2021-09-24 | 济南浪潮数据技术有限公司 | Hot plug protection circuit and method |
| CN113741673B (en) * | 2021-08-27 | 2023-08-18 | 苏州浪潮智能科技有限公司 | Protection device applied to hot plug server |
| CN114050714B (en) * | 2022-01-13 | 2022-04-22 | 苏州浪潮智能科技有限公司 | Method, circuit, device and medium for protecting PCIE (peripheral component interface express) card power supply |
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| CN105337480A (en) * | 2015-10-22 | 2016-02-17 | 南宁市桂芯微电子科技有限公司 | Grid driving circuit with switching tubes connected in parallel |
| CN106774772A (en) * | 2017-01-16 | 2017-05-31 | 郑州云海信息技术有限公司 | A kind of hot plug module electric supply installation, method and system |
| CN107357707A (en) * | 2017-07-18 | 2017-11-17 | 郑州云海信息技术有限公司 | A kind of hot plug framework, storage server and method for reducing switching power loss |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105337480A (en) * | 2015-10-22 | 2016-02-17 | 南宁市桂芯微电子科技有限公司 | Grid driving circuit with switching tubes connected in parallel |
| CN106774772A (en) * | 2017-01-16 | 2017-05-31 | 郑州云海信息技术有限公司 | A kind of hot plug module electric supply installation, method and system |
| CN107357707A (en) * | 2017-07-18 | 2017-11-17 | 郑州云海信息技术有限公司 | A kind of hot plug framework, storage server and method for reducing switching power loss |
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