CN215870757U

CN215870757U - Hot plug protection module

Info

Publication number: CN215870757U
Application number: CN202122420996.XU
Authority: CN
Inventors: 杨松楠; 张茗涵
Original assignee: Tianjin Guangdian Fengtai Technology Co ltd
Current assignee: Tianjin Optical Electrical Communication Technology Co Ltd
Priority date: 2021-10-08
Filing date: 2021-10-08
Publication date: 2022-02-18
Anticipated expiration: 2031-10-08

Abstract

The utility model provides a hot plug protection module which comprises a direct current input end and a direct current output end, wherein the direct current input end is respectively connected with one end of a first capacitor, one end of a second resistor and one end of a fourth resistor; the other end of the first capacitor is connected with the base electrode of the triode; the other end of the second resistor is respectively connected with one end of a third resistor and the grid of the field effect transistor; the other end of the third resistor is connected to a collector of the triode, and an emitter of the triode is grounded; the other end of the fourth resistor is connected with a source electrode of the field effect transistor; the drain electrode of the field effect transistor is respectively connected with the direct current output end and one end of the third capacitor; the second resistor is also connected with a second capacitor in parallel. The utility model can control the high instantaneous current generated during hot plugging to a lower and reasonable level, thereby protecting the following circuit from the impact of instantaneous high voltage and high current.

Description

Hot plug protection module

Technical Field

The utility model belongs to the technical field of electronic circuits, and particularly relates to a hot plug protection module.

Background

In the field of electronic circuits, more and more electronic devices are required to support hot-plugging during use. The key of realizing hot plug is to control the high instantaneous current at a relatively low and reasonable level, so as to protect the following circuit from the impact of single high discharge capacity, namely, the transient surge current on the power bus is controlled at a relatively low level through hot plug protection. Under the condition of no hot plug protection, when the plug is not powered off, the current and the voltage are suddenly changed, so that the subsequent circuit is damaged, the existing hot plug protection circuit is simply formed by a capacitor and a diode, and the effect of controlling the instantaneous current is not ideal.

Disclosure of Invention

The utility model aims to provide a hot-plug protection module which can control high instantaneous current to be at a lower and reasonable level so as to protect a following circuit from being impacted by single high discharge capacity.

In order to achieve the purpose, the technical scheme of the utility model is realized as follows:

a hot plug protection module comprises a direct current input end and a direct current output end, wherein the direct current input end is respectively connected with one end of a first capacitor, one end of a second resistor and one end of a fourth resistor; the other end of the first capacitor is connected with the base electrode of the triode; the other end of the second resistor is respectively connected with one end of a third resistor and the grid of the field effect transistor; the other end of the third resistor is connected to a collector of the triode, and an emitter of the triode is grounded; the other end of the fourth resistor is connected with a source electrode of the field effect transistor; the drain electrode of the field effect transistor is respectively connected with the direct current output end and one end of the third capacitor; the second resistor is also connected with a second capacitor in parallel.

Furthermore, the other end of the first capacitor is also connected to one end of a first resistor, and the other end of the first resistor is grounded.

Further, the other end of the third capacitor is grounded.

Compared with the prior art, the utility model has the following beneficial effects:

the utility model can control the high instantaneous current generated during hot plugging to a lower and reasonable level, thereby protecting the following circuit from the impact of instantaneous high voltage and high current.

Drawings

FIG. 1 is a block diagram of the present invention application;

fig. 2 is a schematic structural diagram of an embodiment of the present invention.

Wherein:

r1, a first resistor; r2, a second resistor; r3, third resistor; r4, fourth resistor;

c1, a first capacitance; c2, a second capacitor; c3, a third capacitance;

q1, triode; q2, field effect transistor.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 1 shows an application of a hot plug protection module according to a specific embodiment of the present invention, and as shown in fig. 1, an ac power is input to a power input interface, and filtered by a power filter to filter out power noise, so as to ensure that a signal is affected by a power as little as possible. And a fuse is added before the live wire input to prevent the short circuit from burning the equipment. And the on-off of the live wire and the zero line is controlled simultaneously by utilizing the double-pole double-throw switch. And inputting the alternating current into the power supply module and outputting the direct current. The direct current input hot plug protection module provided by the utility model can control the transient surge current on the power bus at a lower level, so that the direct current input into the working module originally is subjected to hot plug protection.

As shown in fig. 2, the hot swap protection module of the present invention includes a dc input terminal and a dc output terminal, where the dc input terminal is respectively connected to one end of the first capacitor C1, one end of the second resistor R2, and one end of the fourth resistor R4; the other end of the first capacitor C1 is connected with the base electrode of a triode Q1; the other end of the second resistor R2 is respectively connected with one end of a third resistor R3 and the grid of a field effect transistor Q2; the other end of the third resistor R3 is connected to the collector of the triode Q1, and the emitter of the triode Q1 is grounded; the other end of the fourth resistor R4 is connected with the source electrode of the field effect transistor Q2; the drain electrode of the field effect transistor Q2 is respectively connected with a direct current output end and one end of a third capacitor C3, and the other end of the third capacitor C3 is grounded; the second resistor R2 is also connected in parallel with a second capacitor C2.

The other end of the first capacitor C1 is further connected to one end of a first resistor R1, and the other end of the first resistor R1 is grounded.

In the above structure, the first capacitor C1 and the third capacitor C3 serve as decoupling capacitors to reduce the noise of the component coupled to the power supply terminal, so that the influence of the noise of the component on other components can be indirectly reduced. When the direct current is directly pulled out during power-on, instantaneous high current can appear at the direct current input end, and the first capacitor C1 can be charged due to sudden increase of the input current, so that the base voltage of the triode Q1 is increased, and the collector and the emitter are conducted. After the capacitor is turned on, the voltage difference between the two ends of the second capacitor C2 becomes large, the third resistor R3 starts to be charged, at the moment, the grid voltage of the field effect transistor Q2 is 0, the source electrode and the drain electrode are disconnected, the third capacitor C3 starts to discharge after the disconnection, and the output voltage slowly decreases. When the first capacitor C1 discharges, the base voltage of the transistor Q1 becomes 0, the transistor Q1 turns off, and the collector and emitter are disconnected. The second capacitor C2 discharges, the voltage difference between the gate and the source of the fet Q2 increases, the source and the drain are turned on, and the third capacitor C3 starts to charge but the charge amount is less than the first charge. When the discharge of the second capacitor C2 is finished, the gate voltage of the fet Q2 drops to 0 again, the fet Q2 is turned off, and the source and drain of the fet Q2 are disconnected again. The third capacitor C3 discharges again, so that the single discharge electric quantity is effectively reduced, and the impact on subsequent working circuits is avoided.

Under the condition of power-on, after the device is inserted, instantaneous high current can appear at the direct current input end, and the input current suddenly increases, so that the first capacitor C1 can be charged, the base voltage of the triode Q1 is increased, and the collector and the emitter are conducted. After the capacitor is turned on, the voltage difference between the two ends of the second capacitor C2 becomes large, the third resistor R3 starts to be charged, at the moment, the grid voltage of the field effect transistor Q2 is 0, the source electrode and the drain electrode are disconnected, the third capacitor C3 starts to discharge after the disconnection, and the output voltage slowly decreases. When the first capacitor C1 discharges, the base voltage of the transistor Q1 becomes 0, the transistor Q1 turns off, and the collector and emitter are disconnected. The second capacitor C2 discharges, the voltage difference between the gate and the source of the fet Q2 increases, the source and the drain are turned on, and the third capacitor C3 starts to charge until the dc output is stable.

In summary, in the embodiment, the high instantaneous current generated during hot plugging is controlled to be a relatively low and reasonable level, so that the following circuit is protected from the impact of the instantaneous high voltage and high current.

The present invention is not limited to the above embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A hot plug protection module is characterized by comprising a direct current input end and a direct current output end, wherein the direct current input end is respectively connected with one end of a first capacitor, one end of a second resistor and one end of a fourth resistor; the other end of the first capacitor is connected with the base electrode of the triode; the other end of the second resistor is respectively connected with one end of a third resistor and the grid of the field effect transistor; the other end of the third resistor is connected to a collector of the triode, and an emitter of the triode is grounded; the other end of the fourth resistor is connected with a source electrode of the field effect transistor; the drain electrode of the field effect transistor is respectively connected with the direct current output end and one end of the third capacitor; the second resistor is also connected with a second capacitor in parallel.

2. A hot plug protection module according to claim 1, wherein the other end of the first capacitor is further connected to one end of a first resistor, and the other end of the first resistor is grounded.

3. A hot plug protection module according to claim 1, wherein the other terminal of the third capacitor is connected to ground.