CN219611754U

CN219611754U - Power supply switching circuit, power supply and electronic equipment

Info

Publication number: CN219611754U
Application number: CN202222772715.1U
Authority: CN
Inventors: 陈求求
Original assignee: Shanghai Jinzhuo Technology Co ltd
Current assignee: Shanghai Jinzhuo Technology Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-08-29
Anticipated expiration: 2032-10-21

Abstract

The embodiment of the disclosure discloses a power switch circuit, a power supply and electronic equipment, wherein a power output end transmits electric energy to a system power supply end through the power switch circuit, and the power switch circuit comprises a field effect transistor switch module, a first resistor, a second resistor and a key switch module; the power supply output end is connected to the system power supply end through the field effect transistor switch module to form a first passage, the source electrode of the field effect transistor switch module is connected with the power supply output end, and the drain electrode of the field effect transistor switch module is connected with the system power supply end; the power output end is connected to the ground end through the first resistor, the second resistor and the key switch module which are connected in series to form a second path, wherein the grid electrode of the field effect transistor switch module is connected to the common end of the first resistor and the second resistor which are connected in series in the second path. The key switch can not generate larger fire fox peak voltage when being turned on and turned off, so that the safety of the power switch circuit is ensured, a larger space is not needed when the key switch is used, and the development space of the power switch circuit can be increased.

Description

Power supply switching circuit, power supply and electronic equipment

Technical Field

The disclosure relates to the technical field of switching circuits, and in particular relates to a power switching circuit, a power supply and electronic equipment.

Background

At present, a large ship-shaped switch is generally used for powering up and powering down a system power supply of a plurality of items, and the ship-shaped switch is directly connected to a system main power supply circuit during operation so as to realize power-off and power-on of the system. Reference is made to fig. 1, wherein element "J1305" represents a boat-type switch used in the up and down circuits of a system.

However, the ship-shaped switch not only occupies a large space, but also has a large fire fox spike voltage when being electrified or powered off directly by the general power supply, and the system is easily damaged by long-term repeated up-down capacitor impact, so that the safety risk exists more seriously, and the safety coefficient of the system is lower.

Along with the large-area popularization and use of electronic equipment, more demands are also put forward on the requirements of a power switch, so that a power-on and power-off switching circuit of a total power supply is designed according to the demands: firstly, the switch does not need to pass through large current, so that the safety burden of the system is reduced; in addition, the switch does not occupy excessive space.

Disclosure of Invention

The embodiment of the disclosure provides a power switch circuit, a power supply and electronic equipment, which are used for solving the problems that a switch occupies a large space in a traditional power switch circuit, and a system is easy to damage due to the existence of a large fire fox peak voltage.

In one aspect of the disclosed embodiments, a power switching circuit is provided, through which a power output end transmits power to a system power supply end, the power switching circuit includes a field effect transistor switching module, a first resistor, a second resistor, and a key switch module;

the power supply output end is connected to the system power supply end through a field effect transistor switch module to form a first passage, wherein a source electrode of the field effect transistor switch module is connected with the power supply output end, and a drain electrode of the field effect transistor switch module is connected with the system power supply end;

the power output end is connected to the grounding end through a first resistor, a second resistor and a key switch module which are connected in series to form a second path, wherein the grid electrode of the field effect transistor switch module is connected to the common end of the first resistor and the second resistor which are connected in series in the second path.

Optionally, in the above embodiment of the present disclosure, when the second path is turned on, a voltage division of the first resistor is greater than a turn-on voltage of the fet switch module.

Optionally, in any one of the above embodiments of the disclosure, the power switch circuit further includes a keypad, and the key switch module is mounted on the keypad.

Optionally, in any one of the above embodiments of the disclosure, the power switch circuit further includes a connector module, and the key switch module accesses the second path through the connector module.

Optionally, in any one of the above embodiments of the disclosure, the connector module includes a first connector, a connection flat cable, and a second connector;

the second resistor is connected with the first connector, the first connector is connected with the second connector through a connection flat cable, and the second connector is connected with the key switch module.

Optionally, in any embodiment of the disclosure, the key switch module is a self-locking switch.

Optionally, in any one of the above embodiments of the present disclosure, the power switch circuit further includes a protection capacitor module, one end of the protection capacitor module is connected to the drain electrode of the fet switch module, and the other end is connected to the ground terminal.

According to another aspect of embodiments of the present disclosure, there is also provided a power supply comprising any of the power switching circuits described above.

According to yet another aspect of the embodiments of the present disclosure, there is also provided an electronic device comprising a power switching circuit as described in any one of the above, or comprising a power supply as described in any one of the above.

The power switching circuit, the power supply and the electronic equipment provided by the embodiment of the disclosure comprise a field effect transistor switching module, a first resistor, a second resistor and a key switch module; the power supply output end is connected to the system power supply end through a field effect transistor switch module to form a first passage, wherein a source electrode of the field effect transistor switch module is connected with the power supply output end, and a drain electrode of the field effect transistor switch module is connected with the system power supply end; the power output end is connected to the grounding end through a first resistor, a second resistor and a key switch module which are connected in series to form a second path, wherein the grid electrode of the field effect transistor switch module is connected to the common end of the first resistor and the second resistor which are connected in series in the second path. Therefore, in the embodiment of the disclosure, the power output end transmits electric energy to the system power supply end through the power switch circuit, and the power switch circuit of the embodiment of the disclosure controls the on and off of the field effect transistor switch through controlling the key switch module, so as to control the power on and off of the power supply. The key switch in the present disclosure only provides a control signal for the conduction of the field effect transistor switch, so the key switch itself does not need to bear too large switching current, so a relatively large fire fox peak voltage is not generated when the key switch is turned on and off, the safety of the power switch circuit is ensured, and based on the above consideration, the key switch used in the power switch circuit scheme provided by the present disclosure also does not need to occupy a large space, and based on this, the space can be saved to further improve the development space of the power switch circuit.

The technical scheme of the present disclosure is described in further detail below through the accompanying drawings and examples.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of a general power switch circuit using a boat-type switch.

Fig. 2 is a schematic diagram of a power switching circuit according to an embodiment of the present disclosure.

Fig. 3 is a schematic diagram of a power switching circuit according to another embodiment of the present disclosure.

Fig. 4 is a schematic diagram of a power switching circuit according to another embodiment of the present disclosure.

Fig. 5 is a schematic view of the first connector of the embodiment shown in fig. 4.

Fig. 6 is a schematic diagram of a second connector according to the embodiment shown in fig. 4.

Fig. 7 is a schematic diagram of a key switch according to the embodiment shown in fig. 4.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.

It will be appreciated by those of skill in the art that the terms "first," "second," etc. in embodiments of the present disclosure are used merely to distinguish between different steps, devices or modules, etc., and do not represent any particular technical meaning nor necessarily logical order between them.

It should also be understood that in embodiments of the present disclosure, "plurality" may refer to two or more, and "at least one" may refer to one, two or more.

It should also be appreciated that any component, data, or structure referred to in the presently disclosed embodiments may be generally understood as one or more without explicit limitation or the contrary in the context.

In addition, the term "and/or" in this disclosure is merely an association relationship describing an association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" in the present disclosure generally indicates that the front and rear association objects are an or relationship.

It should also be understood that the description of the various embodiments of the present disclosure emphasizes the differences between the various embodiments, and that the same or similar features may be referred to each other, and for brevity, will not be described in detail.

Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Embodiments of the present disclosure may be applicable to electronic devices such as terminal devices, computer systems, servers, etc., which may operate with numerous other general purpose or special purpose computing system environments or configurations. Examples of well known terminal devices, computing systems, environments, and/or configurations that may be suitable for use with the terminal device, computer system, server, or other electronic device include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, hand-held or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, small computer systems, mainframe computer systems, and distributed cloud computing technology environments that include any of the foregoing, and the like.

In the research process, the inventor finds that in the power supply switching circuit, a ship-shaped switch which is usually used occupies a large space, and the total power supply directly passes through the ship-shaped switch, so that a relatively large fire fox peak voltage exists when the power supply is electrified or powered off, the power supply system is easily damaged by long-term repeated up-down capacitor impact, the safety risk exists more seriously, and the safety coefficient of the system can be lowered. With the large-area popularization and use of electronic devices, more demands are also put forward on the requirements of the power switch. If the power switch circuit scheme shown in fig. 1 is used, on the one hand, the connector is smaller and cannot bear such large current, so that even if the connector can bear such large current, too much connector pin resources are wasted to adapt the ship-shaped switch, and circuit space is increased. Therefore, this solution is not feasible.

Therefore, a power-on and power-off switching circuit of the total power supply is required to be designed according to the requirements: firstly, the switch does not need to pass through large current, so that the safety burden of the system is reduced; in addition, the device does not occupy excessive space. Many of the current projects place new demands, for example, requiring a switch to occupy less space, preferably on a key pad, connected to the motherboard via a relatively small BTB connector.

Based on the control signal, the key switch module is arranged to provide a control signal for the field effect transistor switch, and the opening and closing of the field effect transistor switch are controlled, so that the power supply is controlled to be powered on and powered off. Therefore, the key switch only provides a control signal for the conduction of the field effect transistor switch, and does not need to bear too large switching current, so that relatively large fire fox peak voltage cannot be generated when the key switch is turned on and turned off, the safety of a power switch circuit is guaranteed, and based on the consideration, the key switch used in the scheme provided by the disclosure does not need large space, and based on the consideration, the development space of the power switch circuit can be further improved by saving space.

The technical scheme of the present disclosure is described in detail below with reference to the accompanying drawings and examples.

Fig. 2 is a schematic diagram of one embodiment of a power switching circuit of the present disclosure.

As shown in fig. 2, this embodiment discloses a power switching circuit 200, through which a power output terminal vsys_main delivers power to a system power supply terminal Vsys. The power switch circuit 200 includes a field effect transistor switch module 220, a first resistor 240, a second resistor 260, and a key switch module 280. The power output end vsys_main is connected to the system power supply end Vsys through the fet switch module 220 to form a first path, wherein the fet switch module 220 is a PMOS tube, the source S end of the PMOS tube is connected to the power output end vsys_main, and the drain D end is connected to the system power supply end Vsys. Meanwhile, the power output terminal vsys_main is connected to the ground terminal through the first resistor 240, the second resistor 260 and the key switch module 280 connected in series to form a second path. The gate G terminal of the fet switch module 220 is connected to a common terminal of the first resistor 240 and the second resistor 260 connected in series in the second path.

When the key switch module 280 is turned on, the second path is turned on, and the voltage division of the first resistor 240 is greater than the turn-on voltage of the fet switch module 220, so that the source and the drain of the fet switch module 220 are turned on when the key switch module 280 is turned on, and the power supply output end vsys_main transmits electric energy to the system power supply end Vsys through the power switch circuit 200. When the second path is opened when the key switch module 280 is opened, the fet switch module 220 is opened to open the first path, and the power supply output terminal vsys_main stops supplying power to the system power supply terminal Vsys. In the present disclosure, based on the on-voltage threshold of the fet switch and the first resistor, the voltage division of the first resistor 240 is greater than the on-voltage of the fet switch module 220 when the second path is on can be controlled by these parameter settings.

In addition, the PMOS tube is used as a switch of the power supply power-on-off switch circuit, and when the PMOS tube is opened and closed, a diode is arranged between the drain electrode D and the source electrode S of the MOS tube to form an instant switch release passage, so that the impact on a rear-end circuit can be prevented.

Therefore, the key switch module 280 is controlled to control the on/off of the fet switch module 220, and the on/off of the switch key is only used as an electric control signal for the on/off of the PMOS transistor, so that the key switch does not need to bear too large switch current, so that the key itself does not generate relatively large fire fox peak voltage when the key switch is on/off, the safety of the power switch circuit is ensured, and because the key switch is controlled only by the signal conducted by the first channel, the key switch does not need a large space any more, and only one signal line is needed, so that the wiring of the circuit is relatively simple, and the development space of the power switch circuit is further increased from another perspective.

Referring to fig. 3, a schematic diagram of a power switch circuit according to another embodiment of the present disclosure is shown, which illustrates an embodiment of using a self-locking switch as a key switch module. As one embodiment of the present disclosure, the key switch module 280 may be provided as a self-locking switch. In fig. 3, B201 is a self-locking switch, R239 and R238 are respectively a first resistor and a second resistor, and Q206 is a field-effect transistor switch PMOS. When the switch button B201 is pressed for the first time, the switch is turned on and keeps realizing self-locking, meanwhile, the right end of the second resistor R238 is grounded, the total power supply voltage of the system is divided by R238 and R239, so that a VGS threshold voltage higher than the selected PMOS tube is separated from two ends of the R239 to turn on the PMOS Q206, and Vsys is turned on to Vsys_main to realize power supply of the system; when the self-locking switch button B201 is pressed for the second time, the switch is turned off, and meanwhile the switch button is sprung out, at the moment, the right end of the R238 is suspended, the voltage at the two ends of the R239 is 0, namely the VGS voltage is 0, the PMOS Q206 is turned off, and the Vsys is disconnected from the Vsys_main, so that the system is powered off.

In other embodiments, the key switch module 280 may be any other simple switch that can be used to implement the conduction of a circuit path in the prior art, and the conduction and the closing of the switch are used as signal control PMOS, which is not limited in this disclosure.

The key switch module 280 according to the embodiment of the present disclosure is only used as a control signal (i.e., a power supply up-down signal of a system on a motherboard) of a field effect control switch, which does not need to bear a larger current, and does not occupy a relatively large space compared with a boat-shaped switch, so that the key switch module can be arranged on a relatively smaller board for operation. Thus, in another embodiment of the present disclosure, the power switch circuit 200 further includes a keypad (not shown), and the key switch module 280 is mounted on the keypad. In use, an operator can control the power supply to be powered on and off by directly operating the key sheet to control the power supply switch circuit 200 to be turned on and off.

Referring to fig. 4-7, which are schematic diagrams of a power switch circuit according to another embodiment of the present disclosure, a key switch module 280 is shown connected to the circuit through a connector module (reference numerals are not shown).

The key switch module 280 may be connected to the motherboard by providing a connector, such as a relatively small BTB connector, when it is connected to the second via. The connector module may include a first connector, a connection cable, and a second connector. The second resistor is connected with the first connector, the first connector is connected with the second connector through a connection flat cable, and the second connector is connected with the key switch module.

Referring to fig. 4 and 5, a system power up-down signal PWRKEY on the motherboard is connected to pin 3 of connector J402. Referring to fig. 6 and 7, a power self-locking switch SW102 provided on a small key pad is connected to the 3 rd pin of the connector J101, and then J101 and J402 are connected through a flat cable, so that the power system can be controlled to be powered on and powered off through the self-locking switch SW 102.

According to another embodiment of the disclosure, the power switching circuit may further include a protection capacitor module, wherein one end of the protection capacitor module is connected to the drain electrode of the field effect transistor switching module, and the other end of the protection capacitor module is connected to the ground terminal. Referring to fig. 3 or fig. 4, the drain of the PMOS Q206 is also grounded through a capacitor C231, and in order to prevent spark at the moment of switching, a protection capacitor may be provided to prevent interference with other electrical appliances.

The embodiment of the disclosure also provides a power supply, which comprises any one of the power supply switch circuits.

The embodiment of the disclosure also provides an electronic device, which may include any one of the power switch circuits described above, or include any one of the power supplies described above.

The power supply or the electronic equipment is based on the power supply switch circuit, and the relatively large fire fox peak voltage can not be generated when the key switch is turned on and off, so that the safety of the power supply switch circuit is ensured, and the development space of the power supply switch circuit can be improved due to the fact that the key switch is used without a large space.

The basic principles of the present disclosure have been described above in connection with specific embodiments, however, it should be noted that the advantages, benefits, effects, etc. mentioned in the present disclosure are merely examples and not limiting, and these advantages, benefits, effects, etc. are not to be considered as necessarily possessed by the various embodiments of the present disclosure. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, since the disclosure is not necessarily limited to practice with the specific details described.

In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different manner from other embodiments, so that the same or similar parts between the embodiments are mutually referred to.

The block diagrams of the devices, apparatuses, devices, systems referred to in this disclosure are merely illustrative examples and are not intended to require or imply that the connections, arrangements, configurations must be made in the manner shown in the block diagrams. As will be appreciated by one of skill in the art, the devices, apparatuses, devices, systems may be connected, arranged, configured in any manner. Words such as "including," "comprising," "having," and the like are words of openness and mean "including but not limited to," and are used interchangeably therewith. The terms "or" and "as used herein refer to and are used interchangeably with the term" and/or "unless the context clearly indicates otherwise. The term "such as" as used herein refers to, and is used interchangeably with, the phrase "such as, but not limited to.

The apparatus of the present disclosure may be implemented in a number of ways. For example, the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, firmware.

It should also be noted that in the apparatus, devices of the present disclosure, the components may be disassembled and/or assembled. Such decomposition and/or recombination should be considered equivalent to the present disclosure.

The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the disclosure to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims

1. The power supply switch circuit is characterized by comprising a field effect transistor switch module, a first resistor, a second resistor and a key switch module;

2. The power switching circuit of claim 1 wherein the voltage division of the first resistor is greater than the turn-on voltage of the fet switch module when the second path is turned on.

3. The power switching circuit of claim 1 further comprising a keypad, the key switch module being mounted to the keypad.

4. A power switching circuit according to claim 1 or claim 3 further comprising a connector module through which the key switch module accesses the second path.

5. The power switching circuit according to claim 4, wherein the connector module includes a first connector, a connection bus, and a second connector;

6. The power switching circuit of claim 1 wherein the key switch module is a latching switch.

7. The power switching circuit of claim 1, further comprising a protective capacitor module having one end connected to the drain of the fet switching module and the other end connected to ground.

8. A power supply comprising a power switching circuit according to any one of claims 1 to 7.

9. An electronic device comprising the power switching circuit of any one of claims 1-7 or comprising the power supply of claim 8.