WO2018035810A1

WO2018035810A1 - Card reader

Info

Publication number: WO2018035810A1
Application number: PCT/CN2016/096722
Authority: WO
Inventors: 刘志伟; 张强; 张青涛
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2016-08-25
Filing date: 2016-08-25
Publication date: 2018-03-01
Also published as: CN107636676A; CN107636676B

Abstract

A card reader comprises: a substrate (301); a first interface (302), disposed on the substrate (301) and used for accessing at least two power supply links; and a power supply load sharing module (303), disposed on the substrate (301), electrically connected to the first interface (302), and used for adjusting power supply voltages of the at least two power supply links to equal voltages, and simultaneously supplying power supply currents of the at least two power supply links to next loads. The card reader is to resolve the problem of interface current reversal caused by inconsistency of voltages of two USB interfaces when the two USB interfaces simultaneously supply power, and to resolve the problem of failure to improve the power supply efficiency in simultaneous power supply of the two USB interfaces because only USB interface can supply a current in a same time.

Description

Card reader

Technical field

The present invention relates to the field of electronic device technologies, and in particular, to a card reader.

Background technique

The Solid State Disk (SSD) of the Peripheral Component Interconnect Express (PCIE) interface is the latest SSD of the current function, and has a faster SSD than the original Serial ATA (SATA) interface. The read/write rate is better for system requirements that require high interface speed. But at the same time as the rate increases, the power consumption is also higher than the SSD of the SATA interface.

Secondly, the PCIE interface SSD cannot be directly connected to the computer at present. It must be connected to the PCIE card slot of the computer motherboard through the adapter board for system memory. If you need to be able to support mobile storage, the current common interface is the computer's universal serial bus USB interface. The USB interface can directly supply current to the downstream load, but in actual use, you need to pay attention to the ability of the USB interface to provide current. Standard, the USB2.0 interface current output capability of the personal computer is 0.5A, and the USB3.0 interface current output capability is 0.9A. The power of a single interface cannot support the power consumption requirements of PCIE SSD. To achieve a USB interface PCIE SSD reader that meets the actual power requirements, two USB ports must be used to provide power to increase the power output of the interface. The second USB interface generally only provides power pins and no longer connects to data signals. At present, the two USB interfaces provide power supply by directly connecting the power supplies of the two USB interfaces, or connecting the rear load through a diode, as described below:

As shown in FIG. 1, the first USB interface 101 and the second USB interface 102 are directly connected to simultaneously supply current to the subsequent stage load 103 to increase the output power. However, if the voltages of the two USB interfaces are inconsistent, the interface current will be reversed.

As shown in FIG. 2, the first USB interface 201 is connected to the rear stage load 205 through the first diode 203, and the second USB interface 202 is connected to the rear stage load 205 through the second diode 204, so that the problem of current backflow can be avoided. However, only one USB interface can supply current to the post-load 205 at the same time. The utilization efficiency of simultaneously powering two USB interfaces is not improved.

Summary of the invention

The embodiment of the invention provides a card reader, which aims to solve the problem that the two USB interface voltages are inconsistent and the interface current is reversed when two USB interfaces are simultaneously powered, and only one USB interface can supply current at the same time. The utilization efficiency of the simultaneous power supply of the two USB interfaces is not improved.

A first aspect of the embodiments of the present invention provides a card reader, including:

Substrate

a first interface, disposed on the substrate, for accessing at least two power supply links;

a power load sharing module disposed on the substrate and electrically connected to the first interface, configured to adjust a power supply voltage of the at least two power supply links to an equivalent voltage, and the at least two paths The supply current of the power supply link is simultaneously supplied to the downstream load.

Optionally, the power load sharing module is further configured to provide the power supply current of the at least two power supply links to the back load in an equal or proportional manner.

Optionally, the power load sharing module is further configured to detect a current of each of the first interfaces connected to the power supply link, where a current of one of the first interfaces is connected to the power supply link is sufficient When the post-stage load provides the operating current, the power load sharing module selects the first interface to access the power supply link to provide an operating current for the post-stage load.

Optionally, the power load sharing module is a dual power sharing current control chip.

Optionally, the power supply link is two paths.

Optionally, the first interface is provided with one or two.

Optionally, if the first interface is provided with one, the first interface may be connected to two external interfaces on the terminal device corresponding to the two power supply links through one power line;

Wherein, one end of the power line is provided with a first port adapted to the first interface, and the other end is provided with two second ports adapted to the external interface.

Optionally, if the first interface is configured with two, the first interface may be connected to two external interfaces on the terminal device corresponding to the two power supply links through two power lines;

Wherein, one end of the power line is provided with a first port adapted to the first interface, and the other end is provided with a second port adapted to the external interface.

Optionally, the external interface is a standard universal serial bus USB interface;

The first interface is a standard USB interface, a mini Mini USB interface or a micro Micro USB interface.

Optionally, the terminal device is a personal computer PC.

Optionally, the card reader is a solid state hard disk card reader.

Optionally, the card reader further includes:

The second interface is disposed on the substrate for plugging the solid state hard disk.

Optionally, the second interface is a fast peripheral component interconnect standard PCIE interface.

Optionally, the first interface is a USB interface.

Optionally, the card reader further includes:

The PCIE-to-UEB bridge chip is disposed on the substrate and located between the first interface and the second interface.

Optionally, the post-stage load comprises: a card reader circuit and a solid state hard disk circuit.

In the technical solution provided by the embodiment of the present invention, a power load sharing module is disposed between the power supply end and the load end, and voltages of two USB interfaces that are not equal are adjusted to be equal voltages for the rear stage load, thereby avoiding current backflow. The problem is that both USB interfaces can simultaneously supply current to the downstream load. Therefore, compared with the prior art, the embodiment of the present invention not only solves the problem that the voltages of the two USB interfaces are inconsistent when the two USB interfaces are simultaneously powered, and the interface current is reversed, and only one USB interface can supply current at the same time. The utilization efficiency of the simultaneous power supply of the two USB interfaces is not improved.

DRAWINGS

1 is a schematic diagram of a power supply of a card reader in the prior art;

2 is another schematic diagram of power supply of a card reader in the prior art;

FIG. 3 is a schematic structural diagram of an embodiment of a card reader according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The terms "first", "second", "third" and "fourth", etc. (if present) in the specification and claims of the present invention and the above figures are used to distinguish similar objects without having to use To describe a specific order or order. It is to be understood that the data so used may be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than what is illustrated or described herein. In addition, the terms "comprises" and "comprises" and "the" and "the" are intended to cover a non-exclusive inclusion, for example, a process, method, system, product, or device that comprises a series of steps or units is not necessarily limited to Those steps or units may include other steps or units not explicitly listed or inherent to such processes, methods, products or devices.

It should be understood that although the foregoing background technology section is described by taking an SSD card reader of a PCIE interface as an example, those skilled in the art should know that the present invention is not only applicable to a card reader of a PCIE interface SSD, but also can be applied to other The type of the card reader, for example, the SSD card reader of the ATA interface, the card reader of the ordinary hard disk, etc., are not limited herein. The embodiment of the present invention mainly takes an SSD card reader of a PCIE interface as an example, and is described in detail.

FIG. 3 is a schematic structural diagram of an embodiment of a card reader according to an embodiment of the present invention. The card reader is mainly used for reading and writing an SSD of a PCIE interface, and includes: a substrate 301, a first interface 302, and a power load. The module 303 and the second interface 304 are equally divided.

The substrate 301 is a circuit board of a card reader. The substrate 301 may be a printed circuit board PCB or other type of circuit board, which is not limited herein.

The first interface 302 is disposed on the base 301 for accessing at least two power supply links. The first interface 302 can be a standard USB interface, a mini Mini USB interface, a micro Micro USB interface, or other types of interfaces. limited.

In the embodiment of the present invention, the first interface 302 is provided with two, and is a USB interface, such as the first USB interface 3021 and the first USB interface 3022 shown in FIG.

It should be noted that the first interface 302 can be set to one or two, or even more, specifically here. Not limited. Taking the two-way power supply link as an example, in the case that one of the first interfaces 302 is provided, the first interface 302 can be connected to two external interfaces on the terminal device corresponding to the two power supply links through one power supply line. Wherein, one end of the power line is provided with a first port adapted to the first interface, and the other end is provided with two second ports adapted to the external interface.

In the case where the first interface 302 is configured to be two, the two first interfaces 302 can be respectively connected to two external interfaces on the terminal device corresponding to the two power supply links through a power line. Wherein, one end of the power line is provided with a first port adapted to the first interface, and the other end is provided with a second port adapted to the external interface.

The terminal device described above may be a personal computer PC, and the external interface may be a USB port on the PC.

The power load sharing module 303 is disposed on the substrate 301 and electrically connected to the first interface 302, configured to adjust a supply voltage of at least two power supply links to an equivalent voltage, and supply current of at least two power supply links. Also provided to the rear load. Secondly, the power load sharing module 303 is further configured to supply the supply current of at least two power supply links to the subsequent load equivalent or proportionally.

In addition, the power load sharing module 303 is further configured to detect the current of each of the first interfaces 302 connected to the power supply link, and when the current of one of the first interfaces 302 is connected to the power supply link is sufficient to provide the working current for the rear load. The power load sharing module 303 selects the first interface 302 to access the power supply link to provide an operating current for the latter load. That is to say, in the case that a USB interface can supply sufficient current, a USB interface can also be used for power supply without requiring two USB interfaces to supply power.

The power load sharing module 303 can be a dual power sharing current control chip, and the specific model is the LTC4370. The LTC4370 is a dual supply current sharing controller with an ideal diode for the MOSFET. These diodes are responsible for isolating reverse current and through current during startup and fault conditions. The forward voltage can be adjusted to share the load current between the power supplies. Unlike other current sharing methods, the device does not require a shared bus or trim pin on the power supply.

Specifically, the two power supply links pass through the first USB interface 3021 and the first USB interface 3022 through the power load sharing module 303 circuit, and then provide current to the subsequent load circuit, and the power load sharing module 303 can connect the first USB interface. The unequal voltages of the two interfaces of the 3021 and the first USB interface 3022 are adjusted to equal voltages for the rear stage load to avoid the problem of current backflow. Such as: use has The current sharing function of the dual-supply current sharing control chip adjusts the two power supply ports of the unequal voltages, so that the output voltages adjusted by the control chip are equal, and the same current value can be output.

Secondly, the dual-supply current-sharing control chip can stabilize the current output of the two USB interfaces to 1/2 of the load current requirement of the latter stage, and complete the two-way current while providing and equally dividing the power. For example, the output current can be set to be equal, such as 0.5A+0.5A. Or each interface is proportionally currentized (each interface can determine the current capability), for example, 30% current is flowed through the first USB interface 3021, and 70% current flows through the second USB interface 3022.

It should be understood that the current sharing is based on the actual size of the current of the circuit, and the demand of this current is distributed to two interfaces (the ratio can be set). For example, if the total demand is 1A, the average score will be 0.5A per interface. If the total demand is 0.6A, the average score will provide 0.3A per interface.

The second interface 304 is disposed on the base 301 for inserting a solid state drive SSD (not shown). If the interface of the solid state drive is a PCIE interface, the second interface 304 can be a PCIE interface; The interface is an ATA interface, and the second interface 304 can be an ATA interface;

The embodiment of the present invention is mainly used for reading and writing a solid state hard disk SSD of a PCIE interface. To this end, the second interface 304 is a PCIE interface 3041.

Secondly, in the embodiment of the present invention, the first interface 302 is a USB interface, and the second interface 304 is a PCIE interface 3041, and the two interface types are different. To this end, the embodiment of the present invention sets a PCIE to USB bridge chip 305 between the first interface 302 and the second interface 304 to perform conversion between interfaces. It should be noted that, in the embodiment of the present invention, the post-stage load includes a card reader circuit in addition to the solid-state hard disk circuit. That is to say, the current supplied by the two power supply links connected from the first USB interface 3021 and the first USB interface 3022 is not only used for the solid state hard disk circuit, but also needs to be used by the card reader circuit.

In addition, the power load sharing module 303 can also detect the number of the first interface 302 accessing the power supply link. Specifically, the power load sharing module 303 can detect the voltage values of the interfaces on the first interface 302 to determine the number of power links. In addition, if the first interface 302 is connected to only one USB interface, and the other is not connected to any interface, that is, when there is no power input, the USB interface can be powered, instead of having to connect the two USB interfaces. powered by. Specifically, dual power supply flow control The chip can automatically detect the voltage difference between the two USB interfaces. If the voltage difference between the two is greater than the set value, the lower voltage interface is automatically turned off, and only the higher voltage interface is turned on to supply power.

To this end, the card reader has a power usage status indication function, indicating the number of current power supply interfaces of the system. After the system obtains information, the low power operation mode can be enabled or disabled, for example, the USB interface speed, the PCIE interface rate, and the PCIE Lane can be reduced. Measures such as the number of channels to reduce power consumption requirements and achieve stable system operation. For example, the two-way power supply interface passes through the dual power supply current sharing control chip, and the dual power supply current sharing control chip controls the power supply to connect the subsequent load current through the MOSFET. When a certain power supply is turned off by the MOSFET (if the above two interface voltage differences are greater than the set value), an indication signal is provided to know the condition of the interface being used.

The SSD itself uses a PCIE interface as a data interface. The PCIE interface itself can support x1, x2, and x4lane for data transmission. The less lane data path transmission means that the data throughput is reduced and the power consumption is reduced. If the card reader detects the current number of channels of the power supply (such as the indication signal mentioned above), and detects that the current USB port is in the state of 2.0 or 3.0, you can also change the number of channels of the PCIE to reduce the power consumption during SSD reading and writing. of.

In the embodiment of the present invention, by adding the power load sharing equalization module 303, the two USB interfaces can simultaneously supply current to the PCIE SSD card reader, thereby ensuring stable system operation when a large current demand is required in the SSD reading and writing process.

The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that The technical solutions are described as being modified, or equivalent to some of the technical features, and the modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

A card reader, comprising:

Substrate

a first interface, disposed on the substrate, for accessing at least two power supply links;

a power load sharing module disposed on the substrate and electrically connected to the first interface, configured to adjust a power supply voltage of the at least two power supply links to an equivalent voltage, and the at least two paths The supply current of the power supply link is simultaneously supplied to the downstream load.
The card reader according to claim 1, wherein the power load sharing module is further configured to provide a supply current of the at least two power supply links to the rear stage load in an equal or proportional manner.
The card reader according to claim 1, wherein the power load sharing module is further configured to detect a current of each of the first interfaces connected to the power supply link, and when one of the first interfaces is connected When the current flowing into the power supply link is sufficient to provide an operating current for the rear stage load, the power load sharing equalization module selects the first interface to access the power supply link to provide an operating current for the rear stage load.
The card reader according to any one of claims 1 to 3, wherein the power load sharing module is a dual power sharing current control chip.
The card reader of claim 1 wherein said power supply link is two paths.
A card reader according to claim 5, wherein said first interface is provided with one or two.
The card reader according to claim 6, wherein if the first interface is provided with one, the first interface can be connected to two terminal devices corresponding to the power supply link through a power line. Two external interfaces are connected;

Wherein, one end of the power line is provided with a first port adapted to the first interface, and the other end is provided with two second ports adapted to the external interface.
The card reader according to claim 6, wherein if the first interface is provided with two, the first interface can pass two power lines and two terminal devices corresponding to the power supply link. The two external interfaces on the connection;

Wherein one end of the power line is provided with a first port adapted to the first interface, and another One end is provided with a second port adapted to the external interface.
The card reader according to claim 7 or 8, wherein the external interface is a standard universal serial bus USB interface;

The first interface is a standard USB interface, a mini Mini USB interface or a micro Micro USB interface.
A card reader according to claim 9, wherein said terminal device is a personal computer PC.
The card reader of claim 1 wherein said card reader is a solid state drive card reader.
The card reader of claim 10, wherein the card reader further comprises:

The second interface is disposed on the substrate for plugging the solid state hard disk.
The card reader of claim 12 wherein said second interface is a fast peripheral component interconnect standard PCIE interface.
The card reader of claim 13 wherein said first interface is a USB interface.
The card reader according to claim 14, wherein the card reader further comprises:

The PCIE-to-UEB bridge chip is disposed on the substrate and located between the first interface and the second interface.
The card reader of claim 1 wherein said post stage load comprises: a card reader circuit and a solid state hard disk circuit.