CN113675830B - A hot-swap device and its input voltage overshoot suppression protection circuit - Google Patents
A hot-swap device and its input voltage overshoot suppression protection circuit Download PDFInfo
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- CN113675830B CN113675830B CN202111218439.8A CN202111218439A CN113675830B CN 113675830 B CN113675830 B CN 113675830B CN 202111218439 A CN202111218439 A CN 202111218439A CN 113675830 B CN113675830 B CN 113675830B
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- 230000001629 suppression Effects 0.000 title claims abstract description 34
- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 238000004146 energy storage Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 33
- 230000005669 field effect Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 9
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010949 copper Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 241000270728 Alligator Species 0.000 description 4
- 230000009471 action Effects 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
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Abstract
本发明公开了一种输入电压过冲抑制保护电路，在热插拔器件的电源连接器未与供电电源充分连接前，默认断开的控制开关可以将储能电容与输入电容隔离开（防止储能电容提升输入电容的容值），从而可以使得输入电容在电源连接器与供电电源接触的瞬间以自身较小的容值起到抑制打火现象的作用，而在电源连接器与供电电源充分连接后，控制装置便可以控制控制开关闭合从而使得电压流向负载，并且在回路产生过充电压的情况下，储能电容以其较大的容值可以抑制过冲电压对电子熔断器的破坏，提升了热插拔器件的工作效率并降低了维修成本。本发明还提供了一种热插拔器件，具有如上输入电压过冲抑制保护电路相同的有益效果。
The invention discloses an input voltage overshoot suppression protection circuit. Before the power connector of the hot-swap device is fully connected with the power supply, the control switch that is disconnected by default can isolate the energy storage capacitor from the input capacitor (to prevent storage It can increase the capacitance of the input capacitor), so that the input capacitor can suppress the spark phenomenon with its own small capacitance at the moment when the power connector is in contact with the power supply, and when the power connector and the power supply are sufficient After the connection, the control device can control the control switch to close so that the voltage flows to the load, and in the case of an overcharged voltage in the loop, the energy storage capacitor can suppress the damage to the electronic fuse caused by the overcharged voltage with its larger capacitance value. Improves hot-swap device productivity and reduces maintenance costs. The present invention also provides a hot-swap device, which has the same beneficial effects as the above input voltage overshoot suppression protection circuit.
Description
Technical Field
The invention relates to the field of hot-plug devices, in particular to an input voltage overshoot suppression protection circuit and a hot-plug device.
Background
In the hot swap protection circuit in the prior art, an input capacitor with a small capacitance value is arranged at the front end of an electronic fuse Efuse, and the input capacitor can inhibit an ignition phenomenon in a hot swap process, but overshoot voltage is generated in a loop under many conditions (Efuse short circuit, over-current protection triggered by the hot swap device and the like), so that the Efuse can be damaged, and the work efficiency is reduced and the maintenance cost is increased.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide an input voltage overshoot suppression protection circuit, which improves the working efficiency of a hot plug device and reduces the maintenance cost; another object of the present invention is to provide a hot swap device including the input voltage overshoot suppression protection circuit, which improves the working efficiency of the hot swap device and reduces the maintenance cost.
In order to solve the above technical problem, the present invention provides an input voltage overshoot suppression protection circuit, including:
the input end of the control switch is connected with the first end of an input capacitor in the original hot plug circuit;
the first end of the energy storage capacitor is connected with the output end of the control switch and the input end of the electronic fuse in the original hot plug circuit respectively, and the second end of the energy storage capacitor is grounded with the second end of the input capacitor and is used for storing the voltage with the preset capacity;
the position detection device is connected with a power supply connector of a hot-plug device where an original hot-plug circuit is located and is used for detecting whether the power supply connector is sufficiently connected with a power supply of the hot-plug device;
and the control device is respectively connected with the position detection device and the control end of the control switch and is used for controlling the control switch which is in default disconnection to be closed when the position detection device detects that the power supply connector is fully connected with the power supply of the hot-plug device.
Preferably, the control switch is a metal oxide semiconductor field effect transistor MOS.
Preferably, the control switch comprises a PMOS and a first resistor;
the first end of the PMOS is used as a self input end, the second end of the PMOS is used as a self output end, the grid electrode of the PMOS is used as a self control end, the first end of the first resistor is respectively connected with the first end of the input capacitor and the input end of the PMOS, and the second end of the first resistor is connected with the grid electrode of the PMOS;
the control device includes:
the processor is respectively connected with the position detection device and the control end of the driving switch and is used for controlling the driving switch to be closed when the position detection device detects that the power connector is fully connected with the power supply of the hot-plug device;
the first end of the driving switch is connected with the control end of the control switch, and the second end of the driving switch is grounded.
Preferably, the position detection device is a travel switch.
Preferably, the input voltage overshoot suppression protection circuit further comprises a second resistor, a third resistor and a controllable switch;
a first end of the second resistor is connected with a first end of the input capacitor, a first end of the first resistor and a first end of the third resistor respectively, a second end of the second resistor is connected with a first end of the travel switch and a control end of the controllable switch respectively, a second end of the travel switch is grounded, a first end of the controllable switch is connected with a second end of the third resistor and a voltage detection end of the processor respectively, and a second end of the controllable switch is grounded;
the travel switch is arranged and used for being closed only when the power supply connector is fully connected with the power supply of the hot plug device;
the processor is a voltage monitoring chip and is specifically used for controlling the driving switch to be closed when a voltage value detected by a voltage detection end of the processor is greater than a preset threshold value.
Preferably, the drive switch and the controllable switch are of the same type of switch.
Preferably, the drive switch and the controllable switch are both NMOS.
Preferably, the input voltage overshoot suppression protection circuit further comprises a prompting device connected with the control device;
the control device is also used for controlling the prompting device to prompt the detection result of the position detection device.
Preferably, the prompting device is a light emitting diode.
In order to solve the technical problem, the invention further provides a hot plug device, which comprises the input voltage overshoot suppression protection circuit.
The invention provides an input voltage overshoot suppression protection circuit, before a power connector of a hot plug device is not fully connected with a power supply, a control switch which is disconnected by default can isolate an energy storage capacitor from an input capacitor (preventing the energy storage capacitor from increasing the capacitance value of the input capacitor), so that the input capacitor can play a role in suppressing the ignition phenomenon with a smaller capacitance value at the moment when the power connector is contacted with the power supply, and after the power connector is fully connected with the power supply, a control device can control the control switch to be closed so that voltage flows to a load, and under the condition that the loop generates overcharge voltage, the energy storage capacitor can suppress the damage of the overshoot voltage to an electronic fuse with a larger capacitance value, thereby improving the working efficiency of the hot plug device and reducing the maintenance cost.
The invention also provides a hot-plug device which has the same beneficial effects as the input voltage overshoot suppression protection circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments 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 to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an input voltage overshoot suppression protection circuit according to the present invention;
FIG. 2 is a schematic diagram of an original hot plug circuit in the prior art;
fig. 3 is a schematic structural diagram of another input voltage overshoot suppression protection circuit provided by the present invention.
Detailed Description
The core of the invention is to provide an input voltage overshoot suppression protection circuit, which improves the working efficiency of a hot plug device and reduces the maintenance cost; the other core of the invention is to provide a hot plug device comprising the input voltage overshoot suppression protection circuit, which improves the working efficiency of the hot plug device and reduces the maintenance cost.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an input voltage overshoot suppression protection circuit provided in the present invention, the input voltage overshoot suppression protection circuit includes:
the input end of the control switch 1 is connected with the first end of an input capacitor in the original hot-plug circuit;
the first end of the energy storage capacitor Cu is connected with the output end of the control switch 1 and the input end of the electronic fuse in the original hot plug circuit, and the second end of the energy storage capacitor Cu is grounded with the second end of the input capacitor and is used for storing the voltage with the preset capacity;
the position detection device 2 is connected with a power supply connector of a hot-plug device where the original hot-plug circuit is located and is used for detecting whether the power supply connector is fully connected with a power supply of the hot-plug device;
and the control device 3 is respectively connected with the position detection device 2 and the control end of the control switch 1 and is used for controlling the control switch 1 which is disconnected by default to be closed when the position detection device 2 detects that the power supply connector is fully connected with the power supply of the hot-plug device.
Specifically, in fig. 1, R1 and R2 are equivalent resistances of front connection portions (including copper bars and alligator clips, for example) of the entire cabinet PSU (Power Supply Unit) output to the Efuse, and L1 and L2 are equivalent inductances of the front connection portions (including copper bars and alligator clips, for example) of the entire cabinet PSU output to the Efuse.
Specifically, considering the technical problems in the background art as described above, in combination with considering that if an attempt is made to suppress the overcharge voltage generated in the loop, the energy storage capacitor Cu may be added at the front end of the Efuse, but because the capacitance value of the energy storage capacitor Cu is large, a strong sparking phenomenon may occur at the connection point at the moment when the power connector is connected to the power supply, so in the present application, the control switch 1 is disposed between the input capacitor Cu and the energy storage capacitor Cu, and when the control device 3 finds that the limit device does not detect that the power connector is sufficiently connected to the power supply, the control switch 1 is in the default open state, and at this time, the control switch 1 may isolate the energy storage capacitor Cu from the input capacitor (prevent the energy storage capacitor Cu from increasing the capacitance value of the input capacitor), so that the input capacitor plays a role of suppressing the sparking phenomenon with its own small capacitance value at the moment when the power connector is contacted to the power supply, after the power supply connector is fully connected with the power supply, the control device 3 can control the control switch 1 to be closed so that the voltage flows to the load, and under the condition that the loop generates the overcharge voltage, the energy storage capacitor Cu can inhibit the overshoot voltage from damaging the electronic fuse due to the large capacitance value of the energy storage capacitor Cu, so that the working efficiency of the hot plug device is improved, and the maintenance cost is reduced.
When the energy storage capacitor Cu is subjected to constant volume, the capacitance value of the energy storage capacitor Cu can be calculated according to the maximum current value generated by short circuit and overcurrent protection and the duration time thereof, which is not described herein again in the embodiments of the present invention.
To better explain the embodiment of the present invention, please refer to fig. 2, fig. 2 is a schematic structural diagram of an original hot plug circuit in the prior art, specifically, Cin is an input capacitor, Cout is a load terminal, and PSU is a main power supply.
Specifically, the type of the power connector can be various, and the power connector can be different according to different hot plugging devices, for example, when the server is a hot plugging device, the power connector can be an alligator clip, and the alligator clip can be connected with a copper bar of a main power supply to obtain power.
The invention provides an input voltage overshoot suppression protection circuit, before a power connector of a hot plug device is not fully connected with a power supply, a control switch which is disconnected by default can isolate an energy storage capacitor from an input capacitor (preventing the energy storage capacitor from increasing the capacitance value of the input capacitor), so that the input capacitor can play a role in suppressing the ignition phenomenon with a smaller capacitance value at the moment when the power connector is contacted with the power supply, and after the power connector is fully connected with the power supply, a control device can control the control switch to be closed so that voltage flows to a load, and under the condition that the loop generates overcharge voltage, the energy storage capacitor can suppress the damage of the overshoot voltage to an electronic fuse with a larger capacitance value, thereby improving the working efficiency of the hot plug device and reducing the maintenance cost.
On the basis of the above-described embodiment:
as a preferred embodiment, the control switch 1 is a MOS (Metal-Oxide-Semiconductor Field-Effect Transistor).
Specifically, the MOS has the advantages of small size, low cost, long life, and the like.
Of course, the control switch 1 may be of other types besides MOS, and the embodiment of the present invention is not limited herein.
For better explaining the embodiment of the present invention, please refer to fig. 3, fig. 3 is a schematic structural diagram of another input voltage overshoot suppression protection circuit provided by the present invention, as a preferred embodiment, the control switch 1 includes a PMOS Q1 and a first resistor R12;
a first end of a PMOS Q1 is used as a self input end, a second end of a PMOS Q1 is used as a self output end, a grid of a PMOS Q1 is used as a self control end, a first end of a first resistor R12 is respectively connected with a first end of an input capacitor and the input end of the PMOS Q1, and a second end of a first resistor R12 is connected with the grid of a PMOS Q1;
the control device 3 includes:
the processor is respectively connected with the position detection device 2 and the control end of the driving switch Q3 and is used for controlling the driving switch Q3 to be closed when the position detection device 2 detects that the power supply connector is fully connected with the power supply of the hot-plug device;
and a driving switch Q3 having a first end connected to the control end of the control switch 1 and a second end connected to ground.
Specifically, when the control switch 1 adopts the combination of the PMOS Q1 and the first resistor R12, the corresponding control device 3 can control the closing of the PMOS Q1 by controlling the grounding of the driving switch Q3, and the PMOS Q1 is in the open state due to the pull-up action of the first resistor R12 when the driving switch Q3 is open.
The control device 3 and the control switch 1 in the embodiment of the invention have the advantages of simple structure and low cost.
Of course, the control switch 1 and the control device 3 may have other specific configurations besides the specific configuration, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the position detecting means 2 is a stroke switch SW 1.
Specifically, the travel switch SW1 has advantages of small size and low cost.
Of course, the position detecting device 2 may be of various types other than the stroke switch SW1, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the input voltage overshoot protection circuit further includes a second resistor R10, a third resistor R11, and a controllable switch Q2;
a first end of a second resistor R10 is connected with a first end of the input capacitor, a first end of a first resistor R12 and a first end of a third resistor R11 respectively, a second end of the second resistor R10 is connected with a first end of a travel switch SW1 and a control end of a controllable switch Q2 respectively, a second end of the travel switch SW1 is grounded, a first end of the controllable switch Q2 is connected with a second end of the third resistor R11 and a voltage detection end of the processor respectively, and a second end of the controllable switch Q2 is grounded;
the travel switch SW1 is used for closing only when the power supply connector is fully connected with the power supply of the hot plug device;
the processor is a voltage monitoring chip and is specifically used for controlling the driving switch Q3 to be closed when the voltage value detected by the voltage detection end of the processor is greater than a preset threshold value.
Specifically, considering that under the condition that the power connector is normally connected with the power supply, if the power supply is powered up again after power failure, Vin will undergo a re-raising process in the power-up process, in this process, it is not suitable to directly connect the Efuse into the loop, otherwise, the load will affect the stability of the power supply, therefore, in the embodiment of the present invention, "whether the processor can normally monitor Vin" is determined by the state of the limit switch, under the condition that the power connector is not fully connected with the power supply, the limit switch is in the off state, at this time, the influence of the controllable switch Q2 on the pull-up of the potential of the second resistor R10 can be in the on state, the level of the voltage detection end can be pulled down to make the processor unable to normally monitor Vin, and under the condition that the power connector is fully connected with the power supply, the limit switch is in the on state, at this time, the control end of the controllable switch Q2 is pulled low, so that the controllable switch Q2 is turned off, and at this time, the processor can smoothly monitor Vin, and can control the control switch 1 to be closed when the voltage value of Bin is greater than the preset threshold value, that is, Vin rises to a certain height, so as to connect the power supply loop of the hot-plug device.
As a preferred embodiment, the drive switch Q3 and the controllable switch Q2 are the same type of switch.
Specifically, the driving switch Q3 and the controllable switch Q2 are the same type of switch, so that the difficulty in type selection can be reduced.
As a preferred embodiment, the drive switch Q3 and the controllable switch Q2 are both NMOS.
Specifically, the NMOS has advantages of long lifetime and fast response speed.
Of course, the driving switch Q3 and the controllable switch Q2 may be of other types besides NOMS, and the embodiment of the present invention is not limited herein.
As a preferred embodiment, the input voltage overshoot suppression protection circuit further comprises a prompting device connected with the control device 3;
the control device 3 is also used for controlling the prompting device to prompt the detection result of the position detection device 2.
Specifically, in order to facilitate the working personnel to know whether the power connector is fully connected with the power supply in time, the prompting device in the embodiment of the present invention may prompt the detection result of the position detection device 2 under the control of the control device 3, and may be specifically divided into two types of results, that is, fully connected/not fully connected.
As a preferred embodiment, the prompting device is a light emitting diode.
The light emitting diode has the advantages of small volume, low cost, long service life and the like.
Of course, the prompting device may be of other types besides the led, and the embodiment of the present invention is not limited herein.
The invention also provides a hot plug device which comprises the input voltage overshoot suppression protection circuit in the embodiment.
Specifically, the hot-plug device in the embodiment of the present invention may be of various types, for example, may be a server.
For the description of the hot swap device provided in the embodiment of the present invention, refer to the embodiment of the input voltage overshoot suppression protection circuit described above, and the embodiments of the present invention are not described herein again.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
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| CN202111218439.8A CN113675830B (en) | 2021-10-20 | 2021-10-20 | A hot-swap device and its input voltage overshoot suppression protection circuit |
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| CN202111218439.8A CN113675830B (en) | 2021-10-20 | 2021-10-20 | A hot-swap device and its input voltage overshoot suppression protection circuit |
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| CN113675830B true CN113675830B (en) | 2022-02-18 |
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| CN109067161B (en) * | 2018-08-09 | 2024-07-30 | 中国铁道科学研究院集团有限公司 | Power supply safety starting system |
| CN110137927B (en) * | 2019-06-11 | 2021-06-08 | 合肥联宝信息技术有限公司 | Anti-surge circuit of electronic equipment and electronic equipment |
| CN111934304B (en) * | 2020-09-02 | 2022-12-20 | 苏州浪潮智能科技有限公司 | A protection circuit and protection method for preventing hot-plug voltage surge |
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