CN112214439B - Hot plug self-identification circuit and identification method - Google Patents
Hot plug self-identification circuit and identification method Download PDFInfo
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- CN112214439B CN112214439B CN202011148542.5A CN202011148542A CN112214439B CN 112214439 B CN112214439 B CN 112214439B CN 202011148542 A CN202011148542 A CN 202011148542A CN 112214439 B CN112214439 B CN 112214439B
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Abstract
The invention relates to a hot plug self-recognition circuit, which comprises a hot plug chip, a hot plug detection module and an enabling switch module; the hot plug chip comprises an input end, an output end and an enabling end; the output end of the hot plug chip is connected with the hot plug detection module, the hot plug detection module is connected with the enable switch module, and the enable switch module is connected with the enable end of the hot plug chip; the hot plug detection module controls the on-off of the enabling switch module by detecting the voltage of the output end of the hot plug chip, and realizes a hot plug self-identification circuit and an identification method which are provided for controlling the enabling end of the hot plug chip.
Description
Technical Field
The invention belongs to the technical field of hot plug detection, and particularly relates to a hot plug self-identification circuit and an identification method.
Background
Many board cards in storage and server electronic equipment are standard cards, and interfaces among the board cards are not designed in a set, so that many interfaces are consistent, but in an unknown application scenario, the problems of power-on disorder or overlarge impact current easily occur in a hot plugging process, and uncertain conditions such as system downtime and the like are caused.
The original hot plug detection circuit, after enabling signal is effective, the hot plug chip is worked in the active state, chip output has already been normal, when the board card inserts, is equivalent to direct output and supplies power for the integrated circuit board, and impulse current can be great. The overcurrent protection point of the hot plug chip can be reached, and the overcurrent protection of the hot plug chip is triggered, so that the system is abnormal.
Therefore, it is necessary to provide a hot plug self-identification circuit and an identification method for overcoming the above drawbacks in the prior art.
Disclosure of Invention
The invention provides a hot plug self-identification circuit and an identification method, aiming at the defects that in the prior art, the interface between the prior board cards is not designed in a complete set, disorder is easy to occur in the hot plug process, and the prior hot plug detection circuit is directly output to the board cards when the board cards are inserted, so that the overcurrent protection of hot plug chips can be triggered.
In a first aspect, the present invention provides a hot plug self-identification circuit, which includes a hot plug chip, a hot plug detection module, and an enable switch module;
the hot plug chip comprises an input end, an output end and an enabling end;
the output end of the hot plug chip is connected with the hot plug detection module, the hot plug detection module is connected with the enable switch module, and the enable switch module is connected with the enable end of the hot plug chip;
the hot plug detection module controls the on-off of the enabling switch module by detecting the voltage of the output end of the hot plug chip, so that the enabling end of the hot plug chip is controlled.
Furthermore, the OUTPUT end of the hot-plug chip is connected with an external OUTPUT end OUTPUT, the INPUT end of the hot-plug chip is connected with an external INPUT end INPUT, the enabling end of the hot-plug chip is connected with a seventh resistor R7, and the other end of the seventh resistor R7 is connected with an external power supply.
Furthermore, the hot plug detection module comprises a first operational amplifier A1, a second operational amplifier A2 and an AND gate C1;
the positive input end of the first operational amplifier A1 is connected with a first resistor R1 and a first diode D1, the other end of the first resistor R1 is connected with an external power supply, the positive electrode of the first diode D1 is connected with the positive input end of the first operational amplifier A1, and the negative electrode of the first diode D1 is connected with an external OUTPUT end OUTPUT;
the reverse input end of the first operational amplifier A1 is connected with a second resistor R2 and a third resistor R3, the other end of the second resistor R2 is connected with an external power supply, and the other end of the third resistor R3 is grounded;
the positive input end of the second operational amplifier A2 is connected with a fourth resistor R4, and the other end of the fourth resistor R4 is connected with an external power supply;
the inverting input end of the second operational amplifier A2 is connected with a fifth resistor R5 and a sixth resistor R6, the other end of the fifth resistor R5 is connected with an external OUTPUT end OUTPUT, and the other end of the sixth resistor R6 is grounded;
one input end of the AND gate C1 is connected with the output end of the first operational amplifier A1, and the other input end of the AND gate C1 is connected with the output end of the second operational amplifier A2;
setting the ratio of the resistance value of the first resistor R1 to the resistance value of the first diode D1 as b1;
setting the ratio of the resistance value of the second resistor R2 to the resistance value of the third resistor R3 as b2;
b1> b2 are set, and the difference between b1 and b2 is greater than a set threshold.
Further, the resistance of the second resistor R2 is set to be equal to the resistance of the third resistor R3, and the resistance of the first resistor R1 is set to be equal to the resistances of the fifth resistor and the sixth resistor.
Further, the enabling switch module comprises a triode Q1;
the base electrode of the triode Q1 is connected with the output end of the AND gate C1, the emitting electrode of the triode Q1 is grounded, and the collecting electrode of the triode Q1 is connected with the enabling end of the hot plug chip.
Further, the voltage of the external power supply is 3.3V;
the first resistor R1 is 1M omega, the fifth resistor R5 is 1M omega, and the sixth resistor R6 is 1M omega;
the resistances of the second resistor R2 and the third resistor R3 are both 10K omega;
the triode Q1 adopts a PNP type triode.
In a second aspect, the present invention provides a method for identifying a hot plug self-identification circuit based on the first aspect, including the following steps:
s1, when a board card is not in place, a hot plug detection module controls an enabling end of a hot plug chip to be invalid by detecting an output end of the hot plug chip;
s2, when a board card is inserted, the hot plug detection module controls the enabling end of the hot plug chip to be effective by detecting the output end of the hot plug chip;
and S3, when the hot plug chip works normally, the hot plug detection module controls the enabling end of the hot plug chip to be effective by detecting the output end of the hot plug chip.
Further, the step S1 includes the following steps:
s11, when the board card is not in place, the first diode D1 is not conducted, the forward input end voltage of the first operational amplifier A1 is 3.3V, the resistance values of the second resistor R2 and the third resistor R3 are equal, the reverse input end voltage of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is at a high level;
s12, the voltage of the forward input end of the second operational amplifier A2 is 3.3V, the voltage of the reverse input end of the second operational amplifier A2 is 0, and the output end of the second operational amplifier A2 is at a high level;
s13, both input ends of an AND gate are high level, and the output end of the AND gate is high level;
s14, the base electrode of the triode Q1 is in a high level, current flows through the triode Q1, the enabling end of the hot-plug chip is pulled down, and the enabling end is invalid.
Further, the step S2 specifically includes the following steps:
s21, when a board card is inserted, the first diode D1 is conducted, the voltage drop of the first diode D1 is 0.3V, the resistance value of the first diode D1 is smaller than that of the first resistor R1, the voltage of the forward input end of the first operational amplifier A1 is smaller than 1M omega, the resistance values of the second resistor R2 and the third resistor R3 are equal, the voltage of the reverse input end of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is at a low level;
s22, the voltage of the forward input end of the second operational amplifier A2 is 3.3V, the voltage of the reverse input end of the second operational amplifier A2 is 0, and the output end of the second operational amplifier A2 is at a high level;
s23, one input end of the AND gate is at a high level, the other input end of the AND gate is at a low level, and the output end of the AND gate is at a low level;
s24, the base electrode of the triode Q1 is at a low level, the triode Q1 is in a cut-off state, no current flows, the enabling end of the hot plug chip is at a high level, and the enabling end is effective.
Further, the step S3 specifically includes the following steps:
s31, when the hot-swap chip normally works, the voltage of the output end of the hot-swap chip is larger than the voltage of an external power supply, the first diode D1 is not conducted, the voltage of the forward input end of the first operational amplifier A1 is 3.3V, the resistance values of the second resistor R2 and the third resistor R3 are equal, the voltage of the reverse input end of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is at a high level;
s32, the voltage of the output end of the hot-plug chip is 2 times larger than the voltage of an external power supply, the resistance values of a fifth resistor R5 and a sixth resistor R6 are equal, the voltage of the reverse input end of a second operational amplifier A2 is larger than that of the forward input end, and the output end of the second operational amplifier is at a low level;
s33, one input end of the AND gate is at a high level, the other input end of the AND gate is at a low level, and the output end of the AND gate is at a low level;
s34, the base electrode of the triode Q1 is at a low level, the triode Q1 is in a cut-off state, no current flows through, the enabling end of the hot plug chip is at a high level, and the enabling end is effective.
The beneficial effect of the invention is that,
the hot plug self-recognition circuit and the recognition method provided by the invention realize the self-adaptation of the in-place detection of the board card in the hot plug process of the board card, can recognize the in-place condition of various board cards, and control the power-on time sequence of the enable end through the in-place condition of the board card, namely, the hot plug chip is effective when the board card is in place, thereby effectively avoiding the instability of the board card in the hot plug process, and being widely suitable for the situation that the hot plug of a non-standard board card is not fixedly matched and recognized in place.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the circuit configuration of the present invention;
FIG. 2 is a circuit diagram of the hot plug self-identification of the present invention;
FIG. 3 is a schematic flow chart of the method of embodiment 3 of the present invention;
FIG. 4 is a schematic flow chart of the method of embodiment 4 of the present invention;
in the figure, 1-hot plug chip; 1.1-input; 1.2-output end; 1.3-enable terminal; 2-hot plug detection module; 3-enabling the switch module; OUTPUT-external OUTPUT; IN-external input; a1-a first operational amplifier; a2-a second operational amplifier; C1-AND gate; r1-a first resistance; r2-a second resistor; r3-a third resistor; r4-a fourth resistor; r5-a fifth resistor; r6-a sixth resistor; r7-seventh resistor; a Q1-triode; d1-first diode.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
Example 1:
as shown in fig. 1, the present invention provides a hot plug self-identification circuit, which comprises a hot plug chip 1, a hot plug detection module 2 and an enable switch module 3;
the hot plug chip 1 comprises an input end 1.1, an output end 1.2 and an enable end 1.3;
the output end 1.2 of the hot plug chip 1 is connected with the hot plug detection module 2, the hot plug detection module 2 is connected with the enable switch module 3, and the enable switch module 3 is connected with the enable end 1.3 of the hot plug chip 1;
the hot plug detection module 2 controls the on-off of the enabling switch module 3 by detecting the voltage of the output end 1.2 of the hot plug chip 1, so as to realize the control of the enabling end 1.3 of the hot plug chip 1.
Example 2:
as shown in fig. 2, the present invention provides a hot plug self-identification circuit, which includes a hot plug chip 1, a hot plug detection module 2 and an enable switch module 3;
the hot plug chip 1 comprises an input end 1.1, an output end 1.2 and an enable end 1.3;
the output end 1.2 of the hot plug chip 1 is connected with the hot plug detection module 2, the hot plug detection module 2 is connected with the enable switch module 3, and the enable switch module 3 is connected with the enable end 1.3 of the hot plug chip 1;
the hot plug detection module 2 controls the on-off of the enabling switch module 3 by detecting the voltage of the output end 1.2 of the hot plug chip 1, so as to realize the control of the enabling end 1.3 of the hot plug chip 1;
an OUTPUT end 1.2 of the hot-plug chip 1 is connected with an external OUTPUT end OUTPUT, an INPUT end 1.1 of the hot-plug chip 1 is connected with an external INPUT end INPUT, an enabling end 1.3 of the hot-plug chip 1 is connected with a seventh resistor R7, and the other end of the seventh resistor R7 is connected with an external power supply;
the hot plug detection module 2 comprises a first operational amplifier A1, a second operational amplifier A2 and an AND gate C1;
the positive input end of the first operational amplifier A1 is connected with a first resistor R1 and a first diode D1, the other end of the first resistor R1 is connected with an external power supply, the positive electrode of the first diode D1 is connected with the positive input end of the first operational amplifier A1, and the negative electrode of the first diode D1 is connected with an external OUTPUT end OUTPUT;
the reverse input end of the first operational amplifier A1 is connected with a second resistor R2 and a third resistor R3, the other end of the second resistor R2 is connected with an external power supply, and the other end of the third resistor R3 is grounded;
the positive input end of the second operational amplifier A2 is connected with a fourth resistor R4, and the other end of the fourth resistor R4 is connected with an external power supply;
the reverse input end of the second operational amplifier A2 is connected with a fifth resistor R5 and a sixth resistor R6, the other end of the fifth resistor R5 is connected with an external OUTPUT end OUTPUT, and the other end of the sixth resistor R6 is grounded;
one input end of the AND gate C1 is connected with the output end of the first operational amplifier A1, and the other input end of the AND gate C1 is connected with the output end of the second operational amplifier A2;
setting the ratio of the resistance value of the first resistor R1 to the resistance value of the first diode D1 as b1;
setting the ratio of the resistance value of the second resistor R2 to the resistance value of the third resistor R3 as b2;
b1> b2 is set, and the difference value between b1 and b2 is greater than a set threshold value;
setting the resistance value of the second resistor R2 to be equal to the resistance value of the third resistor R3, and setting the resistance value of the first resistor R1 to be equal to the resistance values of the fifth resistor and the sixth resistor;
the enabling switch module 3 comprises a triode Q1;
the base electrode of the triode Q1 is connected with the output end of the AND gate C1, the emitting electrode of the triode Q1 is grounded, and the collecting electrode of the triode Q1 is connected with the enabling end 1.3 of the hot plug chip 1.
In some embodiments, the first resistor R1 is 1M Ω, the fifth resistor R5 is 1M Ω, and the sixth resistor R6 is 1M Ω;
the resistances of the second resistor R2 and the third resistor R3 are both 10K omega;
the triode Q1 adopts a PNP type triode.
Example 3:
as shown in fig. 3, the present invention provides a method for identifying a hot plug self-identification circuit according to embodiment 1, which includes the following steps:
s1, when the board card is not in place, the hot plug detection module controls the enabling end of the hot plug chip to be invalid by detecting the output end of the hot plug chip;
s2, when a board card is inserted, the hot plug detection module controls the enabling end of the hot plug chip to be effective by detecting the output end of the hot plug chip;
and S3, when the hot plug chip works normally, the hot plug detection module controls the enabling end of the hot plug chip to be effective by detecting the output end of the hot plug chip.
Example 4:
as shown in fig. 4, the present invention provides an identification method for a hot plug self-identification circuit based on the foregoing embodiment 2, including the following steps:
s1, when a board card is not in place, a hot plug detection module controls an enabling end of a hot plug chip to be invalid by detecting an output end of the hot plug chip; the method comprises the following specific steps:
s11, when the board card is not in place, the first diode D1 is not conducted, the forward input end voltage of the first operational amplifier A1 is 3.3V, the resistance values of the second resistor R2 and the third resistor R3 are equal, the reverse input end voltage of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is in a high level;
s12, the voltage of the forward input end of the second operational amplifier A2 is 3.3V, the voltage of the reverse input end of the second operational amplifier A2 is 0, and the output end of the second operational amplifier A2 is at a high level;
s13, both input ends of an AND gate are high level, and the output end of the AND gate is high level;
s14, the base electrode of the triode Q1 is at a high level, current flows through the triode Q1, the enabling end of the hot-plug chip is pulled down, and the enabling end is invalid;
s2, when a board card is inserted, the hot plug detection module controls the enabling end of the hot plug chip to be effective by detecting the output end of the hot plug chip; the method comprises the following specific steps:
s21, when a board card is inserted, the first diode D1 is conducted, the voltage drop of the first diode D1 is 0.3V, the resistance value of the first diode is smaller than that of a first resistor 1M omega, the voltage of the forward input end of the first operational amplifier A1 is smaller than 1.5V, the resistance values of a second resistor R2 and a third resistor R3 are equal, the voltage of the reverse input end of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is at a low level;
s22, the voltage of the forward input end of the second operational amplifier A2 is 3.3V, the voltage of the reverse input end of the second operational amplifier A2 is 0, and the output end of the second operational amplifier A2 is at a high level;
s23, one input end of the AND gate is at a high level, the other input end of the AND gate is at a low level, and the output end of the AND gate is at a low level;
s24, the base electrode of the triode Q1 is at a low level, the triode Q1 is in a cut-off state, no current flows, the enabling end of the hot-plug chip is at a high level, and the enabling end is effective;
s3, when the hot plug chip works normally, the hot plug detection module controls the enabling end of the hot plug chip to be effective by detecting the output end of the hot plug chip; the method comprises the following specific steps:
s31, when the hot-swap chip normally works, the voltage of the output end of the hot-swap chip is larger than the voltage of an external power supply, the first diode D1 is not conducted, the voltage of the forward input end of the first operational amplifier A1 is 3.3V, the resistance values of the second resistor R2 and the third resistor R3 are equal, the voltage of the reverse input end of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is at a high level;
s32, the voltage of the output end of the hot-plug chip is 2 times larger than the voltage of an external power supply, the resistance values of a fifth resistor R5 and a sixth resistor R6 are equal, the voltage of the reverse input end of a second operational amplifier A2 is larger than that of the forward input end, and the output end of the second operational amplifier is at a low level;
s33, one input end of the AND gate is at a high level, the other input end of the AND gate is at a low level, and the output end of the AND gate is at a low level;
s34, the base electrode of the triode Q1 is at a low level, the triode Q1 is in a cut-off state, no current flows, the enabling end of the hot plug chip is at a high level, and the enabling end is effective.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions should be within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure and the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (4)
1. A hot plug self-recognition circuit is characterized by comprising a hot plug chip (1), a hot plug detection module (2) and an enabling switch module (3);
the hot plug chip (1) comprises an input end (1.1), an output end (1.2) and an enabling end (1.3);
the output end (1.2) of the hot plug chip (1) is connected with the hot plug detection module (2), the hot plug detection module (2) is connected with the enable switch module (3), and the enable switch module (3) is connected with the enable end (1.3) of the hot plug chip (1);
the hot plug detection module (2) controls the on-off of the enabling switch module (3) by detecting the voltage of the output end (1.2) of the hot plug chip (1) to realize the control of the enabling end (1.3) of the hot plug chip (1);
an OUTPUT end (1.2) of the hot-plug chip (1) is connected with an external OUTPUT end OUTPUT, an INPUT end (1.1) of the hot-plug chip (1) is connected with an external INPUT end INPUT, an enabling end (1.3) of the hot-plug chip (1) is connected with a seventh resistor R7, and the other end of the seventh resistor R7 is connected with an external power supply;
the hot plug detection module (2) comprises a first operational amplifier A1, a second operational amplifier A2 and an AND gate C1;
the positive input end of the first operational amplifier A1 is connected with a first resistor R1 and a first diode D1, the other end of the first resistor R1 is connected with an external power supply, the positive electrode of the first diode D1 is connected with the positive input end of the first operational amplifier A1, and the negative electrode of the first diode D1 is connected with an external OUTPUT end OUTPUT;
the reverse input end of the first operational amplifier A1 is connected with a second resistor R2 and a third resistor R3, the other end of the second resistor R2 is connected with an external power supply, and the other end of the third resistor R3 is grounded;
the positive input end of the second operational amplifier A2 is connected with a fourth resistor R4, and the other end of the fourth resistor R4 is connected with an external power supply;
the inverting input end of the second operational amplifier A2 is connected with a fifth resistor R5 and a sixth resistor R6, the other end of the fifth resistor R5 is connected with an external OUTPUT end OUTPUT, and the other end of the sixth resistor R6 is grounded;
one input end of the AND gate C1 is connected with the output end of the first operational amplifier A1, and the other input end of the AND gate C1 is connected with the output end of the second operational amplifier A2;
setting the ratio of the resistance value of the first resistor R1 to the resistance value of the first diode D1 as b1;
setting the ratio of the resistance value of the second resistor R2 to the resistance value of the third resistor R3 as b2;
b1> b2 is set, and the difference value between b1 and b2 is greater than a set threshold value;
the enabling switch module (3) comprises a triode Q1;
the base electrode of the triode Q1 is connected with the output end of the AND gate C1, the emitting electrode of the triode Q1 is grounded, and the collecting electrode of the triode Q1 is connected with the enabling end (1.3) of the hot plug chip (1).
2. A hot plug self-discrimination circuit as claimed in claim 1, wherein the resistance of the second resistor R2 is set to be equal to the resistance of the third resistor R3, and the resistance of the first resistor R1 is set to be equal to the resistances of the fifth resistor and the sixth resistor.
3. The hot plug self-discrimination circuit of claim 1, wherein the voltage of the external power supply is 3.3V;
the first resistor R1 is 1M omega, the fifth resistor R5 is 1M omega, and the sixth resistor R6 is 1M omega;
the resistances of the second resistor R2 and the third resistor R3 are both 10K omega;
the triode Q1 adopts a PNP type triode.
4. A method for identifying a hot-plug self-identification circuit according to any of claims 1-3, comprising the steps of:
s1, when a board card is not in place, a hot plug detection module controls an enabling end of a hot plug chip to be invalid by detecting an output end of the hot plug chip; the step S1 comprises the following specific steps:
s11, when the board card is not in place, the first diode D1 is not conducted, the forward input end voltage of the first operational amplifier A1 is 3.3V, the resistance values of the second resistor R2 and the third resistor R3 are equal, the reverse input end voltage of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is in a high level;
s12, the voltage of the forward input end of the second operational amplifier A2 is 3.3V, the voltage of the reverse input end of the second operational amplifier A2 is 0, and the output end of the second operational amplifier A2 is at a high level;
s13, both input ends of an AND gate are high level, and the output end of the AND gate is high level;
s14, the base electrode of the triode Q1 is at a high level, current flows through the triode Q1, the enabling end of the hot-plug chip is pulled down, and the enabling end is invalid;
s2, when a board card is inserted, the hot plug detection module controls the enabling end of the hot plug chip to be effective by detecting the output end of the hot plug chip; the step S2 comprises the following specific steps:
s21, when a board card is inserted, the first diode D1 is conducted, the voltage drop of the first diode D1 is 0.3V, the resistance value of the first diode D1 is smaller than the resistance value of the first resistor 1M omega, the voltage of the forward input end of the first operational amplifier A1 is smaller than 1.5V, the resistance values of the second resistor R2 and the third resistor R3 are equal, the voltage of the reverse input end of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is at a low level;
s22, the voltage of the forward input end of the second operational amplifier A2 is 3.3V, the voltage of the reverse input end of the second operational amplifier A2 is 0, and the output end of the second operational amplifier A2 is at a high level;
s23, one input end of the AND gate is at a high level, the other input end of the AND gate is at a low level, and the output end of the AND gate is at a low level;
s24, the base electrode of the triode Q1 is at a low level, the triode Q1 is in a cut-off state, no current flows, the enabling end of the hot-plug chip is at a high level, and the enabling end is effective;
s3, when the hot plug chip works normally, the hot plug detection module controls the enabling end of the hot plug chip to be effective by detecting the output end of the hot plug chip; the step S3 comprises the following steps:
s31, when the hot-swap chip normally works, the voltage of the output end of the hot-swap chip is larger than the voltage of an external power supply, the first diode D1 is not conducted, the voltage of the forward input end of the first operational amplifier A1 is 3.3V, the resistance values of the second resistor R2 and the third resistor R3 are equal, the voltage of the reverse input end of the first operational amplifier A1 is 3.3V/2=1.65V, and the output end of the first operational amplifier A1 is at a high level;
s32, the voltage of the output end of the hot plug chip is 2 times larger than the voltage of an external power supply, the resistance values of a fifth resistor R5 and a sixth resistor R6 are equal, the voltage of the reverse input end of a second operational amplifier A2 is larger than that of the forward input end, and the output end of the second operational amplifier is at a low level;
s33, one input end of the AND gate is at a high level, the other input end of the AND gate is at a low level, and the output end of the AND gate is at a low level;
s34, the base electrode of the triode Q1 is at a low level, the triode Q1 is in a cut-off state, no current flows through, the enabling end of the hot plug chip is at a high level, and the enabling end is effective.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011148542.5A CN112214439B (en) | 2020-10-23 | 2020-10-23 | Hot plug self-identification circuit and identification method |
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| CN113485955B (en) * | 2021-07-07 | 2024-02-23 | 合肥中科采象科技有限公司 | Equipment transmission circuit, device and system |
| CN114089824B (en) * | 2021-11-22 | 2024-01-02 | 浪潮商用机器有限公司 | Hot plug part protection method and device |
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| CN107316598A (en) * | 2017-08-14 | 2017-11-03 | 南京中电熊猫平板显示科技有限公司 | A kind of hot plug fault control device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107316598A (en) * | 2017-08-14 | 2017-11-03 | 南京中电熊猫平板显示科技有限公司 | A kind of hot plug fault control device and method |
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