CN116131238A - Circuit for inhibiting hot plug surge current and pluggable module - Google Patents
Circuit for inhibiting hot plug surge current and pluggable module Download PDFInfo
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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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- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to a circuit for inhibiting hot plug surge current and a pluggable module, wherein the circuit is used for the pluggable module, and the circuit comprises the following components: the device comprises a slow start circuit, a reset circuit and a power failure detection circuit; the slow start circuit is used for slowly inputting voltage when the pluggable module is inserted into the system, so that surge current generated by hot plug is in a specified range; the reset circuit is used for resetting the slow start circuit to an initial state when receiving a reset signal; the power-down detection circuit is used for detecting whether the pluggable module is powered down or not, if the power-down detection circuit detects the power-down, a reset signal is sent to the reset circuit, so that the slow start circuit is reset, and the surge current is prevented under the condition of short-time secondary/repeated power-up. The invention can effectively inhibit surge current under the condition of hot plug twice/multiple power-on of the pluggable module in a short time, and has good reliability, economy and practicability.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a circuit for suppressing hot plug surge current and a pluggable module.
Background
The pluggable module is used as an electronic product with complete functions, and is composed of various elements such as an integrated circuit chip, a transistor, a resistor, a capacitor, an inductor and the like, and the whole circuit is usually characterized by capacitive loading to a power supply of the equipment due to the use of a decoupling capacitor.
Pluggable modules must support hot plug, i.e., module installation and replacement, while the device is operating properly. To meet the power integrity requirement, a large number of capacitors are installed in the internal circuit of the module, and the capacitance ranges from tens of microfarads to hundreds of microfarads. Because the capacitor voltage cannot be suddenly changed, when the module is inserted into the system, the module voltage is basically 0V, and the system voltage V is generally 3.3V or more (for example, the optical module is 3.3V, and other modules may be 5V,12V, etc.), because the voltage difference is large, V is the system voltage according to the formula i=v/R, and R is the contact resistance and the wire resistance, the resistance is small, and is about tens of milliohms, so that a very large surge current can be generated at the moment of access. This surge current causes a drop in system voltage, a light person causes a drop in system performance, and a heavy person causes a system reset, so that it is necessary to suppress the surge current to a reasonable range.
The prior art generally adopts a traditional slow start circuit to inhibit surge current, and the traditional slow start circuit can inhibit the surge current generated by the pluggable module when the power is firstly supplied. However, when the pluggable module is actually plugged, the contact between the connector and the socket is jittered, i.e. the contact is disconnected and then contacted, or repeated for more times, so that the situation that the pluggable module is electrified for multiple times in a short time often occurs.
Taking a Pluggable optical module Double-Density four-channel Small Pluggable packaging QSFP-DD (Quad Small Form-factor plug-Double Density) as an example, because Pluggable golden fingers on the module are doubled and are arranged in tandem and are not connected on the surface layer, the Pluggable optical module has the advantages that even if the Pluggable optical module is ideal, the Pluggable optical module is always contacted first, then disconnected and then contacted, and the time for intermediate disconnection is about ten milliseconds. During this brief off time, the charge stored by the module internal capacitance continues to supply the individual circuits to operate, so the voltage drops immediately. The capacitor of the slow start circuit (the capacitor connected with the MOS tube GS in parallel) has large discharge loop resistance, and the MOS is in a good conduction state when the discharge is not large in a short time, namely, the discharge is performed again. Therefore, when the secondary power-on is caused by the re-contact, the voltage of the internal capacitor of the module is reduced more, and an obvious voltage difference exists between the internal capacitor of the module and the power supply of the system, and the traditional slow start circuit is equivalent to a straight-through wire in the situation, so that strong surge current can be generated during the secondary power-on (the short-time secondary power-on condition shown in fig. 2).
Therefore, the traditional slow start circuit can only meet the requirement of one-time power-on, and after the slow start is completed, the slow start circuit is completely conducted, and the same wire is used. If the second power-on occurs in a short time, the second power-on does not have a slow start function, and cannot play a role in inhibiting surge current.
Disclosure of Invention
First, the technical problem to be solved
In view of the foregoing drawbacks and disadvantages of the prior art, the present invention provides a circuit and a pluggable module for suppressing hot plug surge current.
(II) technical scheme
In order to achieve the above purpose, the main technical scheme adopted by the invention comprises the following steps:
in a first aspect, an embodiment of the present invention provides a circuit for suppressing hot plug surge current, for a pluggable module, including: the device comprises a slow start circuit, a reset circuit and a power failure detection circuit.
The slow start circuit is used for slowly inputting voltage when the pluggable module is inserted into the system, so that surge current generated by hot plug is in a specified range;
the reset circuit is electrically connected with the slow start circuit and is used for resetting the slow start circuit to an initial state when receiving a reset signal;
the power-down detection circuit is electrically connected with the reset circuit and is used for detecting whether the pluggable module is powered down or not, if the power-down detection circuit detects that the power-down is powered down, a reset signal is sent to the reset circuit, so that the slow starting circuit is reset, and the surge current is prevented under the condition that the power-up occurs twice or more in the hot plug time period.
The hot plug time period is a time period from the start of a hot plug operation to the stable operation of the pluggable module circuit, and is usually 300 ms-1000 ms.
Optionally, the slow start circuit includes:
the first MOS tube, the first capacitor and the fourth resistor;
two ends of the first capacitor are respectively connected with a source electrode and a grid electrode of the first MOS tube; one end of the fourth resistor is connected with the grid electrode of the first MOS tube, and the other end of the fourth resistor is grounded; the drain electrode of the first MOS tube is connected with the internal power supply of the module, and the source electrode of the first MOS tube is connected with the input of the power supply connector;
when the pluggable module is inserted into the system, the power connector inputs the obtained voltage, the voltage between the grid electrode and the source electrode of the first MOS tube is 0V, and the first MOS tube is in a cut-off state; the first capacitor is slowly charged through the fourth resistor, and as the voltage of the first capacitor is increased to the starting threshold value of the first MOS tube, the first MOS tube is gradually conducted, the power supply voltage in the module is gradually increased, and the slow start of the pluggable module and the suppression of surge current are realized.
Optionally, the first MOS transistor is a P-channel MOSFET.
Optionally, the slow start circuit further comprises a negative feedback circuit,
the two ends of the negative feedback circuit are respectively connected with the drain electrode and the grid electrode of the first MOS tube and are used for carrying out negative feedback when the slow start circuit works, so that the effect of inhibiting surge current is improved;
the negative feedback circuit can inhibit the rapid increase of the grid voltage in the process that the first MOS tube is gradually conducted, so that the current passing through the first MOS tube is inhibited.
Optionally, the negative feedback circuit has a structure that: a capacitor or a series resistance of capacitors.
Optionally, the reset circuit includes:
the first triode, the second triode, the first resistor and the third resistor;
the emitter of the first triode is connected with the input of the power connector, and the collector of the first triode is connected with the grid of the first MOS tube; one end of the first resistor is connected with the input of the power connector, and the other end of the first resistor is connected with the base electrode of the first triode; one end of the third resistor is connected with the base electrode of the first triode, and the other end of the third resistor is connected with the collector electrode of the second triode; the base electrode of the second triode is connected with the input of the power connector through a second resistor;
the base electrode of the second triode is input to the reset circuit, and a high-level reset signal is input to the port, so that the second triode and the first triode can be controlled to be conducted, the first capacitor is rapidly discharged to enable the first MOS tube to be turned off in the forward direction, and the slow start circuit is enabled to be restored to the initial state.
Optionally, the power down detection circuit includes:
the first diode, the second resistor, the fifth resistor, the sixth resistor and the third triode;
one end of the first diode is connected with an internal power supply of the module, the other end of the first diode is connected with a sixth resistor and a fifth resistor, the other end of the sixth resistor is grounded, and the other end of the fifth resistor is connected with a base electrode of the third triode; the emitter of the third triode is grounded, and the collector is connected with the input of the power supply connector through a second resistor;
the collector of the third triode is the output of the power-down detection circuit and is connected with the input of the reset circuit;
the first diode is a voltage stabilizing tube, and the breakdown voltage value of the first diode meets the following conditions:
，
wherein ,
is the breakdown voltage of the first diode, +.>
The unit is V for presetting a power failure detection threshold;
and when the power supply is powered down, the power supply voltage in the module is reduced to a preset power-down detection threshold value, the node voltage of the fifth resistor connected with the first diode is smaller than the conducting voltage of the third triode, the third triode is cut off, and a high-level reset signal is output to the reset circuit under the pull-up action of the second resistor to trigger the slow start circuit to reset.
Optionally, the circuit further comprises an auxiliary circuit:
the second diode, the seventh resistor, the eighth resistor, the ninth resistor, the third capacitor, the fourth triode and the fifth triode;
the emitter of the fourth triode is grounded, the collector of the fourth triode is connected with the input of the power supply connector through the second resistor, and the base of the fourth triode is connected with the input of the power supply connector through the seventh resistor; the emitter of the fifth triode is grounded, the collector is connected with the base of the fourth triode, and the base is connected with the eighth resistor; one end of the third capacitor is grounded, and the other end of the third capacitor is connected with the eighth resistor; one end of the ninth resistor is connected with the eighth resistor, and the other end of the ninth resistor is connected with an internal power supply of the module; one end of the second diode is connected with the eighth resistor, and the other end of the second diode is connected with an internal power supply of the module;
the auxiliary circuit ensures that the power-down detection circuit and the reset circuit do not work under the condition that the internal power supply voltage of the pluggable module is 0 when the pluggable module is powered on for the first time, so that the slow start circuit is started normally.
Optionally, the second diode is a schottky diode.
In a second aspect, the present invention provides a pluggable module, including any of the above-mentioned circuits for suppressing hot plug surge current.
(III) beneficial effects
Compared with the prior art, the circuit for inhibiting the hot plug surge current provided by the invention has the advantages that the power-down detection circuit and the reset circuit are added, so that the slow start circuit can be reset in time under the condition of secondary/multiple power-up of the pluggable module in a short time in a hot plug manner, and the effective inhibition of the secondary/multiple power-up surge current is realized. The circuit has simple and effective structure, does not occupy extra power supply or control pin resource, and has good reliability, economy and practicability.
In addition, the negative feedback circuit is added in the traditional slow start circuit, and compared with the traditional slow start circuit, the effect of suppressing the surge current is enhanced.
Drawings
FIG. 1 is a circuit diagram of a hot plug surge suppression circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a conventional slow start circuit for suppressing surge in accordance with an embodiment of the present invention;
fig. 3 is an effect diagram of suppressing a surge circuit by the slow start circuit according to an embodiment of the present invention.
Reference numerals illustrate:
r1: a first resistor; r2: a second resistor;
r3: a third resistor; r4: a fourth resistor;
r5: a fifth resistor; r6: a sixth resistor;
r7: a seventh resistor; r8: an eighth resistor;
r9: a ninth resistor; c1: a first capacitor;
c2: a second capacitor; and C3: a third capacitor;
m1: a first MOS tube; d1: a first diode;
d2: a second diode; q1: a first triode;
q2: a second triode; q3: a third triode;
q4: a fourth triode; q5: a fifth triode;
VIN: a power connector input; VOUT: and a module internal power supply.
Detailed Description
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
The embodiment provides a circuit for inhibiting hot plug surge current, which comprises a slow start circuit, a reset circuit, a power failure detection circuit and an auxiliary circuit as shown in fig. 1.
As shown in fig. 1, the slow start circuit of the present embodiment includes: the conventional slow start circuit composed of the first MOS tube M1, the first capacitor C1 and the fourth resistor R4, and the second capacitor C2 serving as a negative feedback circuit are used for improving the slow start effect.
In a specific application, the slow start circuit works as follows:
in the initial state, the voltage of the first capacitor C1 and the second capacitor C2 is 0V.
When the power source is turned on, that is, the power source connector inputs VIN to obtain voltage, the GS (that is, the gate and the source of the MOS transistor) voltage of the first MOS transistor M1 of the P-channel MOS transistor is 0V, so that the first MOS transistor M1 is turned off. The first capacitor C1 starts to charge through the fourth resistor R4 and the second capacitor C2. Since the second capacitor C2 is much smaller than the first capacitor C1 (here, the capacitance of the first capacitor C1 is more than 10 times that of the second capacitor C2), the second capacitor C2 is charged fully instantaneously, and the first capacitor C1 is charged slowly. The first capacitor C1 is connected in parallel with the GS of the first MOS transistor M1. Along with the increase of the voltage of the first capacitor C1 to the on threshold of the first MOS transistor M1, the first MOS transistor M1 starts to be turned on gradually, and the voltage of the module internal power supply VOUT starts to rise.
It should be understood that if the second capacitor C2 is not present, the voltage of the first capacitor C1 will increase according to the response rule of the RC first-order differential circuit, and the current flowing through the first MOS transistor M1 increases exponentially after the transconductance amplification of the first MOS transistor M1, so that the slow start effect is general. After the second capacitor C2 is added, a negative feedback effect is achieved, the grid potential of the first MOS tube M1 is stabilized, the grid voltage is not increased exponentially any more, a relatively flat section is formed, and the grid flat voltage limits the current flowing through the first MOS tube M1, so that the purpose of inhibiting surge current is achieved better.
Fig. 2 and fig. 3 provide the effect of suppressing the surge current of the conventional slow start circuit and the slow start circuit (the second capacitor C2 is added) respectively, so that the magnitude of the suppressed current can be compared with that of the first power-on current, the current of the conventional slow start circuit in fig. 2 is about 0.6A, and the current of the slow start circuit in fig. 3 is about 0.4A, so that the effect of suppressing the surge current is obviously improved after the second capacitor C2 is added.
It should be noted that, in the embodiment, the second capacitor C2 is used as the structure of the negative feedback circuit, and in practical application, the negative feedback circuit may be formed by using a structure of a capacitor series resistor to achieve a similar effect.
As shown in fig. 1, in the present embodiment, the reset circuit is composed of a first transistor Q1, a second transistor Q2, a first resistor R1 and a third resistor R3;
the base of the second transistor Q2 is an input of the reset circuit, and when a high level is input, the second transistor Q2 is turned on, and then the first transistor Q1 is turned on. Because the third resistor R3 is smaller, the first transistor Q1 is saturated and turned on, and the first capacitor C1 is rapidly discharged. The first capacitor C1 is thoroughly discharged, so that the first MOS transistor M1 is turned off in the forward direction, that is, in the direction from the input VIN of the power connector to the internal power VOUT of the module, thereby completing the reset of the slow start circuit and enabling the slow start circuit to recover to the initial state.
It should be noted that in the above process, the discharging time of the first capacitor C1 is very fast, and is usually less than 100us, for example, the power connector input vin=3.3v, the third resistor r3=1kΩ, the first capacitor C1 is 1uF, and the triode current amplification factor β takes a value of 100.
The discharging current of the first capacitor C1, that is, the collector current of the first triode Q1, is:
Ic=β*Ib=100*(3.3V-0.65V)/1kΩ=0.265A，
the charge q=u×c=3.3v×1uf of the first capacitor C1 before discharge.
Assuming that the current is linearly decreasing, for discharge q=i×t, the discharge time t=q/i=3.3v×1uf/(0.265A/2) =24.9 us.
It can be understood that the reset circuit can realize that the slow start circuit can quickly complete reset in a short time and return to an initial state.
As shown in fig. 1, in the present embodiment, the power-down detection circuit includes: the first diode D1, the second resistor R2, the fifth resistor R5, the sixth resistor R6 and the third triode Q3.
The first diode D1 is a zener diode, and its breakdown voltage value satisfies:
，
wherein ,
is the breakdown voltage of the first diode D1, +.>
The unit is V for presetting a power failure detection threshold; and 0.7V is the on voltage of the triode.
For example, in practical application, if the preset power failure detection threshold is set to 2.7V, the breakdown voltage of the first diode D1 is 2V, and the working voltage of the pluggable module is 3.3V.
When the pluggable module is communicated with a power supply and normally works, the voltage of the power supply VOUT inside the module is 3.3V, the voltage of a node connected with the first diode D1 of the voltage stabilizing tube is greater than 3.3-2=1.3V and is higher than the starting voltage of the third triode Q3, so that the third triode Q3 is conducted, the third triode Q3 is conducted and output to a low level of the reset circuit, the reset circuit does not act, and the slow starting circuit is not affected.
When the voltage of the input VIN of the power connector is smaller than a preset power failure detection threshold, the voltage of the node connected with the fifth resistor R5 and the first diode D1 is smaller than the conducting voltage of the third triode Q3, the third triode Q3 is cut off, and a high-level reset signal is output to the reset circuit under the pull-up action of the second resistor R2 to trigger the slow start circuit to reset.
As shown in fig. 1, the present embodiment further includes an auxiliary circuit, which includes: the circuit comprises a second diode D2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a third capacitor C3, a fourth triode Q4 and a fifth triode Q5.
The auxiliary circuit is used for ensuring that the power-down detection circuit and the reset circuit do not work under the condition that the voltage of the power supply VOUT in the pluggable module is 0 for the first time, so that the slow start circuit is started normally.
It should be noted that the auxiliary circuit works as follows:
when the pluggable module is electrified for the first time, the voltage of the power supply VOUT in the module is 0V, the fifth triode Q5 is not conducted, the fourth triode Q4 is started under the pull-up action of the seventh resistor R7, the fourth triode Q4 is conducted to pull the high level which is originally output by the power failure detection circuit into the low level, so that the reset circuit does not work, and the slow start circuit is started normally; after the first slow start is finished, the module internal power supply VOUT enables the fifth triode Q5 to be conducted through the ninth resistor R9 and the eighth resistor R8, the base voltage of the fourth triode Q4 is pulled down to about 0V, the fourth triode Q4 is in a cut-off state, and the work of the power failure detection circuit and the reset circuit is not affected.
The third capacitor C3 is used to prolong the acting time of the auxiliary circuit, and ensure that the power-down detection circuit is allowed to start working after the voltage of the power supply VOUT inside the module is higher than a preset power-down detection threshold.
The second diode D2 is a schottky diode, and is configured to accelerate the discharge of the third capacitor C3, ensure that the third capacitor C3 is rapidly discharged during the power failure period, and still prolong the acting time of the auxiliary circuit when the auxiliary circuit is powered on again.
In this embodiment, through the cooperative work of the above circuits, the slow start circuit can be reset after the pluggable module is plugged into the system to be powered on for the first time, so that the problem that the traditional slow start circuit cannot work normally under the condition of secondary/multiple power-on is solved, and the surge current of secondary/multiple power-on is perfectly restrained.
As shown in fig. 2 and fig. 3, when the pluggable module is powered on for the second time in a short time, the conventional slow start circuit of fig. 2 generates larger surge current because of less discharge in a short time, and the basic circuit is equivalent to the through wire, so that the surge current exceeds 3A; in contrast, the embodiment of fig. 3 is based on the circuit design of the present invention, and the slow start circuit can normally operate even when the power is applied for the second time in a short period of time, so that the surge current is suppressed to about 0.4A, and a good suppression effect is achieved.
Example two
The embodiment provides a pluggable module, which comprises any circuit for inhibiting hot plug surge current in the first embodiment, and can effectively inhibit the surge current under the condition of secondary/multiple power-on caused by hot plug in a short time.
It should be noted that in the description of the present specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with the embodiment or example being included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art upon learning the basic inventive concepts. It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention.
Claims (10)
1. A circuit for suppressing hot plug inrush current for a pluggable module, the circuit comprising: the device comprises a slow start circuit, a reset circuit and a power failure detection circuit;
the slow start circuit is used for slowly inputting voltage when the pluggable module is inserted into the system, so that surge current generated by hot plug is in a specified range;
the reset circuit is electrically connected with the slow start circuit and is used for resetting the slow start circuit to an initial state when receiving a reset signal;
the power-down detection circuit is electrically connected with the reset circuit and is used for detecting whether the pluggable module is powered down or not, if the power-down detection circuit detects the power-down, a reset signal is sent to the reset circuit, so that the slow starting circuit is reset, and the surge current is prevented under the condition that the power-up occurs twice or more in the hot plug time period.
2. The circuit for suppressing hot plug surge current of claim 1 wherein said soft start circuit comprises:
a first MOS tube (M1), a first capacitor (C1), a fourth resistor (R4);
two ends of the first capacitor (C1) are respectively connected with a source electrode and a grid electrode of the first MOS tube (M1); one end of the fourth resistor (R4) is connected with the grid electrode of the first MOS tube (M1), and the other end of the fourth resistor is grounded; the drain electrode of the first MOS tube (M1) is connected with the internal power supply (VOUT) of the module, and the source electrode is connected with the input (VIN) of the power supply connector;
when the pluggable module is inserted into the system, the power connector inputs (VIN) to obtain voltage, the voltage between the grid electrode and the source electrode of the first MOS tube (M1) is 0V, and the first MOS tube is in a cut-off state; the first capacitor (C1) is slowly charged through the fourth resistor (R4), and as the voltage of the first capacitor (C1) is increased to the opening threshold value of the first MOS tube (M1), the first MOS tube (M1) is gradually conducted, the voltage of a power supply (VOUT) in the module is gradually increased, and the slow start of the pluggable module and the suppression of surge current are realized.
3. The circuit for suppressing hot plug surge current of claim 2 wherein: the first MOS tube (M1) is a P-channel MOSFET.
4. The circuit for suppressing hot plug surge current of claim 2 wherein said soft start circuit further comprises a negative feedback circuit;
the two ends of the negative feedback circuit are respectively connected with the drain electrode and the grid electrode of the first MOS tube (M1) and are used for carrying out negative feedback when the slow start circuit works, so that the effect of inhibiting surge current is improved;
the negative feedback circuit can inhibit rapid increase of the grid voltage in the process that the first MOS tube (M1) is gradually conducted, so that current passing through the first MOS tube (M1) is inhibited.
5. The circuit for suppressing hot plug surge current of claim 4 wherein said negative feedback circuit is structured as follows: a capacitor or a series resistance of capacitors.
6. The circuit for suppressing hot plug surge current of claim 1 wherein said reset circuit comprises:
a first transistor (Q1), a second transistor (Q2), a first resistor (R1), and a third resistor (R3);
the emitter of the first triode (Q1) is connected with the input (VIN) of the power supply connector, and the collector of the first triode is connected with the grid electrode of the first MOS tube (M1); one end of the first resistor (R1) is connected with the input (VIN) of the power connector, and the other end of the first resistor is connected with the base electrode of the first triode (Q1); one end of the third resistor (R3) is connected with the base electrode of the first triode (Q1), and the other end of the third resistor is connected with the collector electrode of the second triode (Q2); the base electrode of the second triode (Q2) is connected with the input (VIN) of the power supply connector through a second resistor (R2);
the base electrode of the second triode (Q2) is input into the reset circuit, and a high-level reset signal is input into the port, so that the second triode (Q2) and the first triode (Q1) can be controlled to be conducted, the first capacitor (C1) is rapidly discharged to enable the first MOS tube (M1) to be turned off in the forward direction, and the slow start circuit is enabled to be restored to the initial state.
7. The circuit for suppressing hot plug surge current of claim 1 wherein said power down detection circuit comprises:
a first diode (D1), a second resistor (R2), a fifth resistor (R5), a sixth resistor (R6), and a third transistor (Q3);
one end of the first diode (D1) is connected with an internal power supply (VOUT) of the module, the other end of the first diode is connected with a sixth resistor (R6) and a fifth resistor (R5), the other end of the sixth resistor (R6) is grounded, and the other end of the fifth resistor (R5) is connected with a base electrode of a third triode (Q3); the emitter of the third triode (Q3) is grounded, and the collector is connected with the input (VIN) of the power supply connector through a second resistor (R2);
the collector electrode of the third triode (Q3) is the output of the power failure detection circuit and is connected with the input of the reset circuit;
the first diode (D1) is a voltage stabilizing tube, and the breakdown voltage value of the voltage stabilizing tube meets the following conditions:
，
wherein ,
is the breakdown voltage of the first diode (D1)>
The unit is V for presetting a power failure detection threshold;
when the power supply is powered down, the voltage of the power supply (VOUT) inside the module is reduced to a preset power-down detection threshold value, the node voltage of the fifth resistor (R5) connected with the first diode (D1) is smaller than the conducting voltage of the third triode (Q3), the third triode (Q3) is cut off, a high-level reset signal is output to the reset circuit under the pull-up action of the second resistor (R2), and the slow start circuit is triggered to reset.
8. The circuit for suppressing hot plug surge current of claim 7 further comprising an auxiliary circuit:
a second diode (D2), a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a third capacitor (C3), a fourth transistor (Q4), and a fifth transistor (Q5);
the emitter of the fourth triode (Q4) is grounded, the collector is connected with the power connector input (VIN) through a second resistor (R2), and the base is connected with the power connector input (VIN) through a seventh resistor (R7); the emitter of the fifth triode (Q5) is grounded, the collector is connected with the base electrode of the fourth triode (Q4), and the base electrode is connected with the eighth resistor (R8); one end of the third capacitor (C3) is grounded, and the other end of the third capacitor is connected with the eighth resistor (R8); one end of the ninth resistor (R9) is connected with the eighth resistor (R8), and the other end of the ninth resistor is connected with an internal power supply (VOUT) of the module; one end of the second diode (D2) is connected with the eighth resistor (R8), and the other end of the second diode is connected with the internal power supply (VOUT) of the module;
the auxiliary circuit ensures that the power-down detection circuit and the reset circuit do not work under the condition that the internal power supply (VOUT) voltage of the pluggable module is 0 when the pluggable module is powered on for the first time, so that the slow start circuit is started normally.
9. The circuit for suppressing hot plug surge current of claim 8 wherein:
the second diode (D2) is a schottky diode.
10. A pluggable module comprising the circuit of any one of claims 1-9 for suppressing hot plug inrush current.
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| CN116131238B (en) | 2023-08-08 |
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