CN111092546A - Surge suppression slow starting circuit for supporting hot plugging - Google Patents
Surge suppression slow starting circuit for supporting hot plugging Download PDFInfo
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- CN111092546A CN111092546A CN201911371899.7A CN201911371899A CN111092546A CN 111092546 A CN111092546 A CN 111092546A CN 201911371899 A CN201911371899 A CN 201911371899A CN 111092546 A CN111092546 A CN 111092546A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a surge suppression slow start circuit for supporting hot plugging, when an input power supply of electronic equipment is hot plugged, the electronic equipment can bear larger surge current, so that the service life and the reliability of the whole system are reduced, and the surge suppression slow start circuit comprises a one-way conductive diode D1, a one-way conductive diode D2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a P-channel field effect transistor Q1; the invention realizes the control of the grid voltage of the P-channel field effect transistor Q1 by utilizing the unidirectional conductivity of the diode and the charge and discharge of the capacitor, thereby controlling the conduction time of the P-channel field effect transistor Q1, leading the direct current output voltage to slowly rise to the direct current input voltage and greatly reducing the surge current of the direct current input power supply.
Description
Technical Field
The invention relates to a surge suppression slow start circuit for supporting hot plugging, which can be used in electronic equipment and a control system powered by a low-voltage direct-current power supply.
Background
The stability and lifetime of a power supply are critical to an electronic system, and one of the main factors affecting the stability and lifetime of a power supply is the magnitude of the inrush current it is subjected to. In any electronic system with a direct current power supply, when the system is just powered on, because the voltage across the capacitor at the input side of the power supply is zero, a large surge current flows through the input side, and the surge current at the time of starting is more prominent when the power of the system is larger. The capacitor can generate heat seriously due to the effect of ESR (equivalent series resistance) of the capacitor, and the service life of the capacitor can be shortened greatly due to the temperature rise of the capacitor, so that the service life of the whole system is shortened. The existing direct current power supply system is generally not provided with a surge suppression circuit, when the system starting frequency reaches a certain degree, the stability of the power supply is deteriorated, and the stability and the reliability of the whole system are reduced due to long working time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a surge suppression slow start circuit for supporting hot plugging.
The invention comprises a P-channel field effect transistor Q1, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2 and a third capacitor C3;
the unidirectional conductive diode is 1N 4002;
the third capacitor is an electrolytic capacitor with low ESR, and the capacitance value of the third capacitor is 100 uF;
the P-channel field effect transistor Q1 is STD95P3LLH6AG, and the maximum conduction internal resistance is lower than 7m omega;
one end of the fifth resistor R5 is connected with the anode of a direct current input power supply and the source of the P-channel field effect transistor Q1, one end of the first capacitor C1 is connected with the source of the P-channel field effect transistor Q1, the other end of the first capacitor C1 is connected with one end of the first resistor R1, the anode of the first diode D1 and the cathode of the second diode D2, the cathode of the first diode D1 is connected with one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the second resistor R2 is connected with the P-channel field effect transistor Q1, the other end of the third resistor R3 is connected with one end of the second capacitor C2, the other end of the second capacitor C2 is connected with the drain of the P-channel field effect transistor Q1, the anode of the third capacitor C3 and the system direct current output power supply, the cathode of the direct current input power supply is connected with the other end of the fifth resistor R5, the anode of the first resistor R1, the anode of the second resistor R2 and, The other end of the fourth resistor R4, the negative electrode of the third capacitor C3 and the negative electrode of the system DC power supply output are connected.
At the moment of power supply insertion, the gate voltage of the P-channel field effect transistor Q1 is instantaneously increased to the input power supply voltage by the coupling of the capacitor C1 and the unidirectional conduction characteristic of the diode D1, and the P-channel field effect transistor operates in a cut-off region.
Before the grid voltage of the P-channel field effect transistor Q1 is slowly discharged to the threshold voltage through R2 and R4, the P-channel field effect transistor works in a constant current region, and the voltage slow starting of a rear-stage circuit is realized.
When the grid voltage of the P-channel field effect transistor Q1 is discharged through R2 and R4 and the voltage is reduced to the threshold voltage, Q1 is fully conducted, and the slow start is finished.
The first capacitor C1 is a ceramic patch capacitor, and the capacitance value of the first capacitor C1 is 1 uF;
the first resistor R1 is a patch resistor, and the resistance value of the first resistor R1 is 47K omega;
the second resistor R2 is a patch resistor, and the resistance value of the patch resistor is 10 omega;
the third resistor R3 is a patch resistor, and the resistance value of the patch resistor is 2K omega;
the fourth resistor R4 is a patch resistor with the resistance value of 330K omega;
the fifth resistor R5 is a patch resistor with the resistance value of 100K omega;
the second capacitor C2 is a ceramic patch capacitor, and the capacitance value of the ceramic patch capacitor is 22 nF;
the invention has the beneficial effects that: the surge current is restrained from damaging the electronic equipment when the electronic equipment is hot-plugged, the long-time working stability is high, the circuit structure is simple, the circuit maintenance is simple, and the cost is low.
Drawings
FIG. 1 is a circuit diagram of the present invention;
fig. 2 is a block diagram of the circuit of the present invention in an electronic device.
Detailed Description
As shown in fig. 1, a surge suppression slow start circuit for supporting hot plug includes a unidirectional conductive diode D1(1N4002), a unidirectional conductive diode D2(1N4002), a first capacitor C1(1uF), a second capacitor C2(22nF), a third capacitor C3(100uF), a first resistor R1(47K Ω), a second resistor R2(10 Ω), a third resistor R3(2K Ω), a fourth resistor R4(330K Ω), a fifth resistor R5(100K Ω), and a P-channel field effect transistor Q1(STD95P3LLH6 AG).
One end of the fifth resistor R5 is connected with the anode of a direct current input power supply and the source of the P-channel field effect transistor Q1, one end of the first capacitor C1 is connected with the source of the P-channel field effect transistor Q1, the other end of the first capacitor C1 is connected with one end of the first resistor R1, the anode of the first diode D1 and the cathode of the second diode D2, the cathode of the first diode D1 is connected with one end of the second resistor R2, one end of the third resistor R3 and one end of the fourth resistor R4, the other end of the second resistor R2 is connected with the P-channel field effect transistor Q1, the other end of the third resistor R3 is connected with one end of the second capacitor C2, the other end of the second capacitor C2 is connected with the drain of the P-channel field effect transistor Q1, the anode of the third capacitor C3 and the system direct current output power supply, the cathode of the direct current input power supply is connected with the other end of the fifth resistor R5, the anode of the first resistor R1, the anode of the second resistor R2 and, The other end of the fourth resistor R4, the negative electrode of the fourth capacitor C4 and the negative electrode of the system direct-current power supply output are connected.
At the moment when the electronic device is plugged in the power supply, because the voltage across the capacitor cannot suddenly change, the power supply instantaneously charges the gate of the Q1 through the C1, the D1 and the R2, Vg is approximately equal to the input voltage Vg which is Vin, and at the moment, the Q1 is turned off.
Then the gate voltage of Q1 is slowly discharged through R2 and R4, at this time Q1 operates in the constant current region, and the output voltage Vo of the slow start circuit slowly rises. The discharge current of the Q1 gate voltage passing through R2 and R4 is
Since the output voltage Vo rises, the charging current through C2, R3 and R4 is
Vg＝(ig+ic)·R4
Q1, C2, R3, R4, R2 constitute a negative feedback system, and as ic decreases, ig increases, resulting in a decrease in gate voltage. Decreasing the gate voltage increases ic, decreases ig, and finally reaches dynamic equilibrium.
Maximum delay time
dt＝C2·R4；
Fig. 2 is a block diagram of a circuit of the present invention in an electronic device.
Claims (4)
1. A surge suppression slow start circuit for supporting hot-plug is characterized in that: the device comprises a first unidirectional conductive diode D1, a second unidirectional conductive diode D2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a P-channel field effect transistor Q1;
one end of a fifth resistor R5 is connected with the anode of a direct current input power supply and the source of a P-channel field effect transistor Q1, one end of a first capacitor C1 is connected with the source of the P-channel field effect transistor Q1, the other end of the first capacitor C1 is connected with one end of a first resistor R1, the anode of a first diode D1 and the cathode of a second diode D2, the cathode of the first diode D1 is connected with one end of a second resistor R2, one end of a third resistor R3 and one end of a fourth resistor R4, the other end of the second resistor R2 is connected with the grid of the P-channel field effect transistor Q1, the other end of the third resistor R3 is connected with one end of a second capacitor C2, the other end of the second capacitor C2 is connected with the drain of the P-channel field effect transistor Q1, the anode of the third capacitor C3 and the system direct current power supply output anode, the cathode of the direct current input power supply is connected with the other end of the fifth resistor R5, the anode of the first resistor R1 and the anode of the second resistor R, The other end of the fourth resistor R4, the negative electrode of the third capacitor C3 and the negative electrode of the system DC power supply output are connected.
2. A surge suppressing soft start circuit for supporting hot-plugging according to claim 1, wherein: at the moment of power supply insertion, the gate voltage of the P-channel field effect transistor Q1 is instantaneously increased to the input power supply voltage by the coupling of the capacitor C1 and the unidirectional conduction characteristic of the diode D1, and the P-channel field effect transistor operates in a cut-off region.
3. A surge suppressing soft start circuit for supporting hot-plugging according to claim 1 or 2, wherein: before the grid voltage of the P-channel field effect transistor Q1 is slowly discharged to the threshold voltage through R2 and R4, the P-channel field effect transistor works in a constant current region, and the voltage slow starting of a rear-stage circuit is realized.
4. A surge suppressing soft start circuit for supporting hot-plugging according to claim 1, 2 or 3, wherein: when the grid voltage of the P-channel field effect transistor Q1 is discharged through R2 and R4 and the voltage is reduced to the threshold voltage, Q1 is fully conducted, and the slow start is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911371899.7A CN111092546A (en) | 2019-12-26 | 2019-12-26 | Surge suppression slow starting circuit for supporting hot plugging |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911371899.7A CN111092546A (en) | 2019-12-26 | 2019-12-26 | Surge suppression slow starting circuit for supporting hot plugging |
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| CN111092546A true CN111092546A (en) | 2020-05-01 |
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| CN201911371899.7A Pending CN111092546A (en) | 2019-12-26 | 2019-12-26 | Surge suppression slow starting circuit for supporting hot plugging |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111669040A (en) * | 2020-06-12 | 2020-09-15 | 深圳市奥闻科技有限公司 | Circuit and method for inhibiting starting-up instant current of wireless communication terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111669040A (en) * | 2020-06-12 | 2020-09-15 | 深圳市奥闻科技有限公司 | Circuit and method for inhibiting starting-up instant current of wireless communication terminal |
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Application publication date: 20200501 |
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| RJ01 | Rejection of invention patent application after publication |