CN222420948U - Hot plug circuit - Google Patents

Abstract

The utility model discloses a hot plug circuit, which relates to the technical field of computer hardware and system architecture, and comprises an M.2 interface connector, a PMOS tube, a charging capacitor and a pull-up resistor, wherein the M.2 interface connector comprises a plurality of grounding pins, one grounding pin is selected as a switch pin, the switch pin is connected to a grid electrode of the PMOS tube through the pull-up resistor, one end of the charging capacitor is electrically connected with the grid electrode of the PMOS tube, the other end of the charging capacitor is grounded, a drain electrode of the PMOS tube is electrically connected to a power supply end VBUS, and a source electrode of the PMOS tube is electrically connected to a power supply end VDD. According to the utility model, the conversion of the plugging state is realized through the ground pin of the M.2 interface, and the power supply of the USB conversion circuit is controlled through the conduction of the PMOS tube, so that the hot plug can be realized, the resources are saved, the production efficiency is improved, the practicability is strong, and certain advantages are realized.

Description

Hot plug circuit

Technical Field

The utility model relates to the technical field of computer hardware and system architecture, in particular to a hot plug circuit.

Background

Currently, the main-stream hard disk has gradually moved from a magnetic medium to an electronic medium, and the commonly used SSD has two interface standards, namely, NGFF/NVME, which respectively represent the trend of two protocols, wherein NGFF is a supported SATA protocol, and NVME is a supported PCIE protocol.

In the SSD production and circulation process, a large number of SSDs need to be processed and tested, under the existing test conditions, the work can be completed only by powering on a computer system again or plugging in and out the SSD conversion box with the USB interface, and the efficiency of directly powering on and powering off the computer system and then plugging in and out the SSD is too low, so that the SSD conversion box with the USB interface can be used in most practical occasions.

However, when the computer system works, the SSD can not be identified normally by the system, the conversion circuit using the USB can only plug the whole conversion device of the USB, but not plug the SSD alone, the SSD conversion box using the USB interface must be plugged first and then replaced, and then the conversion box of the USB interface is plugged above the computer for use, thus requiring two plugging procedures, which wastes a lot of time and labor, and the loss of plugging of the two interfaces increases exponentially.

In view of the above, there is an urgent need for a hot plug circuit that can achieve hot plug, save resources, and improve production efficiency.

Disclosure of utility model

In order to overcome the defects of the prior art, the utility model provides the hot plug circuit which can realize hot plug, save resources and improve the production efficiency at the same time, and has strong practicability.

The technical scheme includes that the hot plug circuit comprises an M.2 interface connector, a PMOS tube, a charging capacitor and a pull-up resistor, wherein the M.2 interface connector comprises a plurality of grounding pins, one grounding pin is selected as a switch pin, the switch pin is connected to a grid electrode of the PMOS tube through the pull-up resistor, one end of the charging capacitor is electrically connected with the grid electrode of the PMOS tube, the other end of the charging capacitor is grounded, a drain electrode of the PMOS tube is electrically connected to a power supply end VBUS, and a source electrode of the PMOS tube is electrically connected to a power supply end VDD.

In the above technical scheme, the model of the PMOS tube is APM4435, and the PMOS tube is used for controlling the power supply connected with the SSD.

In the above technical solution, the supply voltages of the supply terminal VBUS and the supply terminal VDD are 5V.

In the above technical scheme, when the SSD is not plugged into the m.2 interface connector, the voltage of the switch pin is 5V, and the PMOS transistor is in an off state.

After the SSD is plugged into the M.2 interface connector in the technical scheme, the voltage of the switch pin is 0V, and the PMOS tube is in a conducting state.

The size of the charging capacitor in the technical scheme is 0.1 mu F.

In the above technical solution, the pull-up resistor has a size of 10K.

The capacitor and the inductor are used for stabilizing a power supply, protecting a circuit and improving system performance.

The utility model has the beneficial effects that one of the ground pins redefining the M.2 interface is selected as the detection pin in the hot plug state, and the control signal connected to the PMOS tube as the power switch controls the power supply and the power failure of the USB conversion circuit, because the total number of the ground pins of the M.2 is as large as 19, the performance of the M.2 is not affected by the modification. When the SSD is not inserted, the voltage of the pin is +5V, the PMOS tube is in a disconnected state, the USB conversion circuit is in a power-off state, when the SSD is inserted, the selected pin on the M.2 is connected with the ground pin on the golden finger of the SSD, the voltage of the selected pin on the M.2 is reduced to 0V, the PMOS tube is conducted, the USB conversion circuit is started to supply power, the SSD can be plugged and unplugged when the system is operated, the system is not required to be closed or restarted, the convenience of dynamically expanding, maintaining or replacing hardware equipment is provided, the production efficiency is improved while resources are saved, and certain advantages are achieved.

Drawings

FIG. 1 is a schematic diagram of a hot plug circuit according to the present utility model.

Detailed Description

The invention will be further described with reference to the drawings and examples.

The conception, specific structure, and technical effects produced by the present invention will be clearly and completely described below with reference to the embodiments and the drawings to fully understand the objects, features, and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention. In addition, all the coupling/connection relationships referred to in the patent are not direct connection of the single-finger members, but rather, it means that a better coupling structure can be formed by adding or subtracting coupling aids depending on the specific implementation. The technical features in the invention can be interactively combined on the premise of no contradiction and conflict.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear are used in the embodiments of the present invention) are merely for explaining the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

M.2 is an interface standard for internal connection, which is intended to replace the traditional mSATA interface and supports various connection protocols including SATA, PC I Express (PC I e) and USB, and M.2 standard protocols refer to communication protocols supported by the M.2 interface, which determine the types of devices that the M.2 interface can connect to and their performance characteristics. Protocols that the m.2 interface may support include SATA (Ser I a l ATA), PC I Express (PC I e), USB.

The utility model provides a hot plug circuit which comprises an M.2 interface connector, a PMOS tube, a charging capacitor and a pull-up resistor, wherein the M.2 interface connector comprises a plurality of grounding pins, one grounding pin is selected as a switch pin, the switch pin is connected to the grid electrode of the PMOS tube through the pull-up resistor, one end of the charging capacitor is electrically connected with the grid electrode of the PMOS tube, the other end of the charging capacitor is grounded, the drain electrode of the PMOS tube is electrically connected to a power supply end VBUS, and the source electrode of the PMOS tube is electrically connected to a power supply end VDD.

The model of the PMOS tube is APM4435, the PMOS tube is used for controlling power supply connected with an SSD conversion circuit, when the power supply voltage of a power supply end VBUS and a power supply end VDD is 5V, the voltage of a selected control signal pin is 5V when the SSD is not plugged on an M.2 interface connector, the PMOS tube is in a disconnected state, the voltage of a selected control signal is 0V after the SSD is plugged on the M.2 interface connector, the PMOS tube is in a conducting state, and the size of a charging capacitor is 0.1 mu F.

In particular, APM4435 is a power MOSFET (metal oxide semiconductor field effect transistor) commonly used in power management, power amplification and switching circuits, a MOSFET is a common semiconductor device for controlling the flow of current, and APM4435 is commonly used as a switching tube for implementing a power switching function or power control in a circuit.

Further, APM4435 is a P-channel power MOSFET having the following circuit structure:

Channel P-channel MOSFET means that the channel (channel) is made of P-type (load) material. This means that current cannot pass through the channel when no voltage is applied.

2. The Gate-to-Gate (Gate) is the portion that controls the MOSFET to turn on and off. When a positive voltage is applied to the gate, electrons will be attracted to the oxide layer under the gate, forming a conductive path, thereby rendering the channel conductive. When zero or a negative voltage is applied to the gate, the channel is turned off and the MOSFET is turned off.

3. Drain-to-Source Drain (Drain) and Source (Source) are the two output ports of the MOSFET. The drain is where the charge flows out and the source is where the charge enters. When the MOSFET is turned on, a current flows between the drain and the source.

4. Oxide layer an oxide layer (OxideLayer) is located between the gate and the channel to isolate the gate from the channel. Its thickness and quality can affect the performance of the MOSFET.

Specifically, the ground pins in the pin definition of the standard m.2 interface are utilized, because there are a plurality of ground pins defined in m.2, the definition of one of the ground pins is changed, the selected pin is connected with a PMOS tube to be used as a switch of a power supply, meanwhile, the pin is connected with a pull-up resistor of +5v, when the SSD is not inserted, the voltage of the pin is 5V, at the moment, the PMOS tube is in a disconnected state, and when the SSD is inserted, all the USB conversion circuits are in a power-off state, because the pin of the SSD corresponding to the pin selected by m.2 is the ground pin, when the SSD is inserted, the voltage of the pin is 0, at the moment, the PMOS tube is turned on, power is supplied to the USB conversion circuits, and the SSD and the USB conversion circuits start to operate.

In an embodiment, fig. 1 is a schematic circuit diagram of a hot PLUG circuit, CONN PLUG 40x2 is an m.2 interface connector, APM4435 is a PMOS tube, R1089 and R1141 are pull-up resistors, the m.2 interface connector selects a ground pin 75 as a switch pin to connect a No. 4 pin gate G and a pull-up resistor R1141 of the PMOS tube APM4435, the pull-up resistor R1141 and a capacitor C858 on the right side thereof form a small filter circuit for preventing signal interference, a No. 5 pin drain D1 of the PMOS tube APM4435 is connected to an anode of the USB conversion circuit vbus_5v, no. 1, no. 2 and No. 3 pin sources S1, S2 and S3 of the PMOS tube APM4435 are connected to the pull-up resistor R1089 and the power pin vdd_5v_1, and a No. 5 pin drain D1 of the PMOS tube APM4435 is connected to the LED indicator lamp for indicating a state of the hot PLUG process.

The grounding pin is used for ensuring that current in the equipment can safely flow back to the ground, a PMOS tube is used as a +5V power switch, a pin 75 is connected with a pin G of the PMOS tube (the specific model is APM 4435), the pin 75 is connected to a gate electrode (pin G) of the PMOS tube, and the PMOS tube is usually used as the power switch for controlling the on-off of the current.

The specific specification of connplug 40x2 is 40x2, where 40 represents the pin number of the connector, and 2 represents the row number (number of rows) of the connector, and connplug 40x2 refers to a connector socket with 40 pins and arranged in two rows, and such a connector can be used for connecting between circuit boards or modules of electronic devices to provide a transmission function of data, signals or power.

The pull-up resistor is used to pull one signal line high (typically a supply voltage such as 5V) to ensure that the signal remains at the desired logic state in the absence of an external input.

In the process, the utility model utilizes the PMOS tube to control the on-off of the +5V power supply, utilizes the ground of the SSD as a medium to realize the hot plug function, and uses the ground pin of the golden finger of the SSD as a conducting medium by connecting the selected pin of the M.2 socket to the gate electrode of the PMOS tube. When the PMOS tube is turned on (the gate voltage is at a low level), the +5V power supply supplies power to the whole conversion circuit through the PMOS tube, so that the connection of the power supply is realized, and when the PMOS tube is turned off (the gate voltage is at a high level), the connection of the +5V power supply and the whole conversion circuit is disconnected, and the disconnection of the power supply is realized.

Specifically, the implementation of the hot plug function of the SSD using the socket pins in the specific m.2 specification includes the socket design in the m.2 specification, according to the m.2 specification, a total of 19 pins 71, 73, 75, etc. in the M-type socket are defined as ground, i.e., electrical ground, which is to ensure that the current in the device can safely flow back to ground, and the PMOS tube is used as +5v power switch, in this case, the 75 pin in the m.2 socket is redefined, disconnected from the other pins and connected to the gate (G pin) of the PMOS tube (model APM4435 selected in this case), which is typically used as a power switch to control the on-off of the current.

Through the process, the utility model allows the connection between the socket and the SSD to be maintained, and simultaneously realizes the hot plug function by controlling the on-off of the PMOS tube, because the safety and the stability of the power supply in the plug process are ensured, the utility model realizes the hot plug function by utilizing the PMOS tube as a switch and combining with the ground of the SSD through specific hardware connection and circuit design, thereby ensuring the stability and the reliability of the equipment.

Compared with the prior art, the application utilizes the pin definition of the SSD to drive the connection and disconnection of the PMOS tube according to the existence of the SSD so as to simulate the plug action of the USB device, the hot plug circuit is used for an embedded system, is designed to be small and suitable for the space limitation in the system, integrates the PMOS tube, the pull-up resistor and other necessary elements, has small overall size and simple connection relation, ensures that the device can be directly inserted into an M.2 slot of the system by considering the compatibility with an M.2 interface, ensures the stability and the reliability of the circuit to ensure normal work under various conditions, avoids unstable or damage of the system due to plug operation, comprises safety functions such as overcurrent protection, overvoltage protection and the like so as to protect the SSD and the system from damage, and considers the operation convenience of a user so that the device can be easily installed in the system and can be used without additional setting or adjustment.

While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present application, and the equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.

Claims (7)

1. The hot plug circuit is characterized by comprising an M.2 interface connector, a PMOS tube, a charging capacitor and a pull-up resistor;

The M.2 interface connector comprises a plurality of grounding pins, one of the grounding pins is selected as a switch pin, the switch pin is connected to the grid electrode of the PMOS tube through a pull-up resistor, one end of the charging capacitor is electrically connected with the grid electrode of the PMOS tube, and the other end of the charging capacitor is grounded;

the drain electrode of the PMOS tube is electrically connected to the power supply end VBUS;

the source electrode of the PMOS tube is electrically connected to the power supply end VDD.

2. The hot plug circuit of claim 1, wherein the PMOS transistor is APM4435, and is configured to control a power supply to the SSD.

3. The hot plug circuit of claim 2, wherein the supply voltage of the supply terminal VBUS and the supply terminal VDD is 5V.

4. The hot plug circuit of claim 3, wherein the voltage of the switch pin is 5V and the PMOS transistor is in an off state when the SSD is not plugged onto the m.2 interface connector.

5. The hot plug circuit of claim 3, wherein after the SSD is plugged into the m.2 interface connector, the voltage of the switch pin is 0V, and the PMOS transistor is in a conductive state.

6. The hot plug circuit of claim 1, wherein the charge capacitor has a size of 0.1 μf.

7. The hot plug circuit of claim 1, wherein the pull-up resistor has a magnitude of 10K.