CN212381134U - Inter-board power supply circuit, front circuit board, all-in-one machine circuit board and all-in-one machine - Google Patents
Inter-board power supply circuit, front circuit board, all-in-one machine circuit board and all-in-one machine Download PDFInfo
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- CN212381134U CN212381134U CN202021248382.7U CN202021248382U CN212381134U CN 212381134 U CN212381134 U CN 212381134U CN 202021248382 U CN202021248382 U CN 202021248382U CN 212381134 U CN212381134 U CN 212381134U
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Abstract
The utility model discloses an inter-board power supply circuit, a front circuit board, an all-in-one machine circuit board and an all-in-one machine, wherein, the inter-board power supply circuit is arranged between a system mainboard and the front circuit board and is close to the front circuit board; the inter-board power supply circuit includes: the input end of the voltage conversion module is connected to a first direct-current power supply, the output port of the first direct-current power supply is positioned on the system mainboard, and the first direct-current power supply is provided by the power panel; the output end of the voltage conversion module is connected to the front USB of the front circuit board, the voltage conversion module is used for converting the first direct-current power supply into the second direct-current power supply to be supplied to the front USB, and the voltage of the first direct-current power supply is higher than that of the second direct-current power supply. The utility model discloses reduced the quantity of cable, the current transmission conductor sectional area can reduce by a wide margin between system mainboard and the leading circuit board, simple structure, compactness.
Description
Technical Field
The utility model relates to an intelligence all-in-one technical field, concretely relates to supply circuit, leading circuit board, all-in-one circuit board and all-in-one between board.
Background
With the rapid development of the technology, intelligent integrated machines (commonly called white boards) configured with interactive large screens are more and more popular, and are widely applied to families, offices, schools, entertainment places and the like. For the operation of convenience of a user, an input/output interface, operation keys and the like are designed in front of the intelligent all-in-one machine, due to the consideration of product form and appearance, an independent circuit board (front circuit board) is generally designed in the front and is fixed on a frame of the intelligent all-in-one machine, and the front circuit board is connected with a main board through an electronic cable.
In the prior art, in order to supply power to the front circuit board, a power supply board is generally required to be configured for the front circuit board alone, or a main board PCB of the all-in-one machine is divided into one path of dc power supply to supply power to the front circuit board.
For the mode of configuring the power panel independently, the occupied space is large, and the development of flattening and edge narrowing of the all-in-one machine is limited.
For the mode of shunting by the main board PCB of the all-in-one machine, for example, the power supply specification of the USB is 0.9A, the total current reaches about 2A due to the influence of the power consumption of other circuits of the front board and the like, the power supply can reach the front board only by passing through two sections of cables and the main board PCB, the loss is generated on a transmission conductor, and the voltage of the front board is lower than 5V; meanwhile, the conductor cross-sectional area of the path is required to be large (the cable needs to be combined by a plurality of strands of electronic wire harnesses), so that on one hand, wires are wasted, and on the other hand, the layout area of the PCB is occupied.
Therefore, when providing a power supply to the front-mounted circuit board, how to implement a power supply manner with a compact structure becomes a first technical problem to be solved urgently.
In addition, how to provide a stable working power supply for the front-end circuit board becomes a second technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
Based on above-mentioned current situation, the utility model discloses a main aim at provides a supply circuit, leading circuit board, all-in-one circuit board and all-in-one between one board to the power supply mode that provides compact structure to leading circuit board.
In order to achieve the above object, the utility model adopts the following technical scheme:
in a first aspect, the embodiment of the utility model discloses supply circuit between boards for the leading circuit board of all-in-one, the all-in-one includes: the system comprises a system mainboard, a front circuit board and a power panel, wherein data interaction is carried out between the system mainboard and the front circuit board, the power panel is used for converting commercial power into direct current and providing a required direct current power supply for the all-in-one machine, and an inter-board power supply circuit is arranged between the system mainboard and the front circuit board and is close to the front circuit board; the inter-board power supply circuit includes: the input end of the voltage conversion module is connected to a first direct-current power supply, the output port of the first direct-current power supply is positioned on the system mainboard, and the first direct-current power supply is provided by the power panel; the output end of the voltage conversion module is connected to the front USB of the front circuit board, the voltage conversion module is used for converting the first direct-current power supply into the second direct-current power supply to be supplied to the front USB, and the voltage of the first direct-current power supply is higher than that of the second direct-current power supply.
Optionally, the voltage conversion module is disposed on the front circuit board and is close to a terminal of the system main board for providing the first direct current power supply.
Optionally, the voltage conversion module comprises: the direct current power supply comprises a direct current power supply chip, a first resistor and a second resistor; the input end of the direct current power supply chip is the input end of the voltage conversion module, and the output end of the direct current power supply chip is the output end of the voltage conversion module; one end of the first resistor is connected to the input end of the direct-current power supply chip, and the other end of the first resistor is connected to the enabling end of the direct-current power supply chip; the second resistor is connected between the other end of the first resistor and the ground; the first resistor and the second resistor are configured to provide a bias voltage to an enabling end of the direct current power supply chip; the direct current power supply chip responds to the bias voltage received by the enable end of the direct current power supply chip, converts the first direct current power supply received by the input end of the direct current power supply chip into a second direct current power supply, and outputs the second direct current power supply through the output end of the direct current power supply chip.
Optionally, the voltage conversion module further comprises: the energy storage inductor is connected between the output end of the direct current power supply chip and the preposed USB; and one end of the energy storage capacitor is connected between the energy storage inductor and the preposed USB connection point, and the other end of the energy storage capacitor is connected to the ground.
Optionally, the voltage conversion module further comprises: and the feedback resistor is connected between the preposed USB and the feedback end of the direct current power supply chip so as to feed back the voltage output by the energy storage inductor to the feedback end of the direct current power supply chip.
Optionally, the voltage conversion module further comprises: one end of the bias resistor is connected to a connection point of the feedback end and the feedback resistor, and the other end of the bias resistor is connected to the ground; the bias resistor is used for providing bias voltage to the feedback end.
Optionally, the voltage conversion module further comprises: and the anode of the fly-wheel diode is grounded, and the cathode of the fly-wheel diode is connected between the energy storage inductor and the connection point of the output end of the direct-current power supply chip.
In a second aspect, the embodiment of the utility model discloses a leading circuit board, leading circuit board be used for with the system mainboard data interaction of all-in-one, be provided with leading USB on the leading circuit board, still include: the board-to-board power supply circuit disclosed in the first aspect.
Third aspect, the embodiment of the utility model discloses an all-in-one machine circuit board, include: system mainboard and leading circuit board, system mainboard and the connection of leading circuit board can be dismantled to the electricity, still include: the board-to-board power supply circuit disclosed in the first aspect.
In a fourth aspect, the embodiment of the utility model discloses an all-in-one machine, include: the all-in-one machine circuit board disclosed by the third aspect.
[ PROBLEMS ] the present invention
According to the inter-board power supply circuit, the front-end circuit board, the all-in-one machine circuit board and the all-in-one machine provided by the embodiment of the utility model, the inter-board power supply circuit is arranged between the system main board and the front-end circuit board and is close to the front-end circuit board, and the inter-board power supply circuit comprises a voltage conversion module which is used for converting a first direct current power supply into a second direct current power supply to be provided for the front-end USB; the input end of the voltage conversion module is connected to a first direct-current power supply on the system mainboard, the output end of the voltage conversion module is connected to a front USB of the front circuit board, so that the first direct-current power supply on the system mainboard is converted into a second direct-current power supply through the voltage conversion module, the voltage conversion module is arranged between the system mainboard and the front circuit board, the using amount of cables is reduced, the sectional area of a current transmission conductor between the system mainboard and the front circuit board can be greatly reduced, and the structure is simple and compact.
In addition, the first direct-current power supply is directly provided by the power panel, is directly converted into the second direct-current power supply through the voltage conversion module and is provided for the front USB, so that the voltage of the second direct-current power supply obtained by the front USB is stable, and the voltage drop loss is reduced.
As an optional scheme, the voltage conversion module is disposed on the front circuit board, so that the second dc power supply converted by the voltage conversion module is already located on the front circuit board, and thus the output second dc power supply does not need to be transmitted across boards, that is, fluctuation in the process of transmitting the second dc power supply is reduced, and stability of the second dc power supply is improved.
As an optional solution, the voltage conversion module includes: and the direct current power supply chip responds to the bias voltage received by the enable end of the direct current power supply chip, converts the first direct current power supply received by the input end of the direct current power supply chip into a second direct current power supply and outputs the second direct current power supply through the output end of the direct current power supply chip. That is, the first direct current power supply is directly converted into the second direct current power supply through the direct current power supply chip, so that the circuit structure is further simplified, the area of the PCB is saved, and the realization condition is further provided for the narrow frame.
As an optional scheme, the voltage conversion module further includes: the energy storage inductor and the energy storage capacitor are connected to the output end of the direct current power supply chip, so that the output end of the direct current power supply chip can be charged and discharged in a time-sharing mode, and the second direct current power supply can be continuously output to the front USB.
As an optional scheme, the output voltage of the energy storage inductor is fed back to the feedback end through the feedback resistor and the bias resistor, so that the stability of the second direct current power supply output to the front-end USB can be improved.
Other advantages of the present invention will be described in the detailed description, and those skilled in the art can understand the technical advantages brought by the technical features and technical solutions through the descriptions of the technical features and the technical solutions.
Drawings
Embodiments according to the present invention will be described below with reference to the accompanying drawings. In the figure:
fig. 1 is a schematic structural diagram of circuit boards of an all-in-one machine disclosed in this embodiment;
fig. 2 is a schematic structural diagram of an inter-board power supply circuit disclosed in this embodiment.
Detailed Description
In order to implement a power supply mode with a compact structure when providing a power supply to a front circuit board, the embodiment discloses an inter-board power supply circuit for the front circuit board of an all-in-one machine, please refer to fig. 1, which is a schematic structural diagram of each circuit board of the all-in-one machine disclosed in the embodiment, and the all-in-one machine includes: the system comprises a system mainboard 1, a front circuit board 2 and a power board 3, wherein data interaction is performed between the system mainboard 1 and the front circuit board 2, and the power board 3 is used for converting commercial power into direct current to provide required direct current power for the integrated machine, such as 5V, 12V, 18V and the like.
In this embodiment, the inter-board power supply circuit is disposed between the system motherboard 1 and the front-end circuit board 2, and is close to the front-end circuit board 2. Specifically, the inter-board power supply circuit may be disposed on the front-end circuit board 2, and close to the system motherboard 1; the board-to-board power supply circuit may also be provided on the system motherboard 1, close to the front-end circuit board 2.
Referring to fig. 2, a schematic diagram of a power supply circuit between boards disclosed in this embodiment is shown, where the power supply circuit between boards includes: and an input end of the voltage conversion module 4 is connected to a first direct current power supply, an output port of the first direct current power supply is located on the system mainboard 1, and the first direct current power supply is provided by the power panel 3. It should be noted that, in the specific implementation process, the first dc power supply may be directly provided by the power board 3, or may be multiplexed with the first dc power supply in the system motherboard 1. Specifically, when the first dc power supply in the system main board 1 is multiplexed, the voltage of the first dc power supply should be sufficiently high.
The output end of the voltage conversion module 4 is connected to the front USB21 of the front circuit board 2, and the voltage conversion module 4 is configured to convert the first dc power into the second dc power to be provided to the front USB 21. In this embodiment, the voltage of the first dc power supply is higher than the voltage of the second dc power supply, for example, when the voltage of the second dc power supply is 5V, the voltage of the first dc power supply is 12V, 18V, or the like. In a specific implementation, the front USB21 may be one or more. It should be noted that, in the implementation process, the front USB21 may also be other front interfaces that need to be powered, and should be regarded as an equivalent replacement of the front USB 21.
In an alternative embodiment, the voltage conversion module 4 is disposed on the front circuit board 2, and is close to the terminal 11 of the system main board 1 that supplies the first direct-current power supply. Specifically, the voltage conversion module 4 can be fabricated on the front circuit board 2, thereby making the entire circuit structure compact.
In order to simplify the circuit structure, in an alternative embodiment, referring to fig. 2, the voltage conversion module 4 includes: the direct current power supply chip U1, first resistance R1 and second resistance R2. Wherein:
an input end Vin of the dc power chip U1 is an input end of the voltage conversion module 4, and an output end Vout of the dc power chip U1 is an output end of the voltage conversion module 4. Specifically, an input terminal Vin of the dc power supply chip U1 is directly connected to a terminal of the first dc power supply; the output terminal Vout of the dc power supply chip U1 is connected to the pre-USB 21. When there are multiple pre-USB 21, multiple pre-USB 21 may be connected in parallel to the output terminal Vout of the dc power chip U1. In this embodiment, the output terminal Vout of the dc power chip U1 is connected to the USB21, which means that the output terminal Vout of the dc power chip U1 is connected to the power source terminal of the USB 21.
One end of the first resistor R1 is connected to the input terminal Vin of the dc power supply chip U1, and the other end of the first resistor R1 is connected to the enable terminal EN of the dc power supply chip U1. The second resistor R2 is connected between the other end of the first resistor R1 and ground. In the present embodiment, the first resistor R1 and the second resistor R2 are configured to provide a bias voltage to the enable terminal EN of the dc power supply chip U1.
In this embodiment, the dc power chip U1 converts the first dc power received by the input terminal Vin of the dc power chip U1 into the second dc power in response to the bias voltage received by the enable terminal EN thereof, and outputs the second dc power through the output terminal Vout of the dc power chip U1. Specifically, after the resistances of the first resistor R1 and the second resistor R2 are configured, when the input terminal Vin of the dc power supply chip U1 receives a first dc power, a bias voltage is formed at a connection point of the first resistor R1 and the second resistor R2, so as to provide the bias voltage for the enable terminal EN of the dc power supply chip U1, and drive the dc power supply chip U1 to start power conversion. In a particular embodiment, the DC power chip U1 may be implemented by a DC/DC conversion chip.
In order to realize continuous output of the second dc power to the front USB, in an alternative embodiment, the voltage conversion module 4 further includes: energy storage inductance L1 and energy storage capacitor C6, wherein: the energy storage inductor L1 is connected between the output end Vout of the direct-current power supply chip U1 and the preposed USB 21; one end of the energy storage capacitor C6 is connected between the energy storage inductor L1 and the connection point of the front USB21, and the other end of the energy storage capacitor C6 is connected to the ground. That is, the front USB21 is connected between the connection point of the energy storage inductor L1 and the energy storage capacitor C6. When the energy storage inductor L1 works in a charging state, the energy storage capacitor C6 discharges to the front USB 21; on the contrary, when the energy storage capacitor C6 is in the charging state, the energy storage inductor L1 discharges to the front USB 21. Therefore, the energy storage inductor L1 and the energy storage capacitor C6 are enabled to store and discharge energy alternately, and the second direct current power supply is continuously output to the front USB. It should be noted that, in an alternative embodiment, a filter capacitor C5 may be further included, and the filter capacitor C5 is connected between the pre-USB 21 and the ground to filter the second dc power flowing to the pre-USB 21.
In order to improve the stability of the second dc power supply to the front USB output, in an alternative embodiment, the voltage conversion module 4 further includes: the feedback resistor R5 and the feedback resistor R5 are connected between the pre-USB 21 and the feedback terminal FB of the DC power supply chip U1, so as to feed back the voltage output by the energy storage inductor L1 to the feedback terminal FB of the DC power supply chip U1.
Optionally, the voltage conversion module 4 further includes: one end of the bias resistor R6 is connected to the connection point of the feedback end FB and the feedback resistor R5, and the other end of the bias resistor R6 is connected to the ground; the bias resistor R6 is used to provide a bias voltage to the feedback terminal FB.
In order to regulate the current of the energy storage inductor L1, in an alternative embodiment, the voltage conversion module 4 further includes: a freewheeling diode D1, the anode of the freewheeling diode D1 is grounded, and the cathode of the freewheeling diode D1 is connected between the connection point of the energy storage inductor L1 and the output terminal Vout of the dc power supply chip U1, thereby providing a freewheeling path for the energy storage inductor L1.
In the specific implementation process, according to the specific requirements of the chip, appropriate peripheral circuits can also be configured. For example, the slow start pin SS of the dc power chip U1 is connected to ground through a resistor R4 and a capacitor C3. An error amplifier output pin CO of the direct current power supply chip U1 is connected to the ground through a capacitor C2, and after the capacitor C1 is connected with a resistor R3 in series, the capacitor C1 is connected with two ends of the capacitor C2 in parallel. The capacitor C4 is connected between the output terminal Vout of the dc power supply chip U1 and the bootstrap pin BOOT.
The embodiment further discloses a front circuit board, please refer to fig. 2, the front circuit board is used for interacting with system motherboard data of the all-in-one machine, a front USB is arranged on the front circuit board, and the all-in-one machine front circuit board further includes: the board-to-board power supply circuit disclosed in the above embodiments.
The embodiment also discloses an all-in-one machine circuit board, please refer to fig. 1, including: the system mainboard 1 and the front circuit board 2 are electrically connected in a detachable mode, and the system mainboard 1 and the front circuit board 2 are electrically connected in a detachable mode. This all-in-one circuit board still includes: the board-to-board power supply circuit disclosed in the above embodiments.
This embodiment also discloses an all-in-one, include: the all-in-one machine circuit board disclosed by the embodiment.
According to the inter-board power supply circuit, the front-end circuit board, the all-in-one machine circuit board and the all-in-one machine provided by the embodiment of the utility model, the inter-board power supply circuit is arranged between the system main board and the front-end circuit board and is close to the front-end circuit board, and the inter-board power supply circuit comprises a voltage conversion module which is used for converting a first direct current power supply into a second direct current power supply to be provided for the front-end USB; the input end of the voltage conversion module is connected to a first direct-current power supply on the system mainboard, the output end of the voltage conversion module is connected to a front USB of the front circuit board, so that the first direct-current power supply on the system mainboard is converted into a second direct-current power supply through the voltage conversion module, the voltage conversion module is arranged between the system mainboard and the front circuit board, the using amount of cables is reduced, the sectional area of a current transmission conductor between the system mainboard and the front circuit board can be greatly reduced, and the structure is simple and compact.
In addition, the first direct-current power supply is directly provided by the power panel, is directly converted into the second direct-current power supply through the voltage conversion module and is provided for the front USB, so that the voltage of the second direct-current power supply obtained by the front USB is stable, and the voltage drop loss is reduced.
It will be appreciated by those skilled in the art that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the above-described embodiments are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions may be made in the details described herein by those skilled in the art without departing from the basic principles of the invention.
Claims (10)
1. An interplate power supply circuit for a front-end circuit board of an all-in-one machine, the all-in-one machine comprising: system mainboard (1), leading circuit board (2) and power strip (3), wherein, system mainboard (1) with carry out data interaction between leading circuit board (2), power strip (3) are used for converting the commercial power into the direct current, provide required DC power supply, its characterized in that for the all-in-one, and the electric power strip is used for:
the inter-board power supply circuit is arranged between the system main board (1) and the front circuit board (2) and is close to the front circuit board (2);
the inter-board power supply circuit includes:
the input end of the voltage conversion module (4) is connected to a first direct current power supply, the output port of the first direct current power supply is positioned on the system mainboard (1), and the first direct current power supply is provided by the power panel (3);
the output end of the voltage conversion module (4) is connected to a front USB (21) of the front circuit board (2), the voltage conversion module (4) is used for converting the first direct-current power supply into a second direct-current power supply to be supplied to the front USB (21), and the voltage of the first direct-current power supply is higher than that of the second direct-current power supply.
2. The board-to-board power supply circuit according to claim 1, characterized in that the voltage conversion module (4) is provided on the front-end circuit board (2) and is located close to a terminal of the system main board (1) that provides the first direct current power supply.
3. The interplate power supply circuit according to claim 1 or 2, characterized in that the voltage conversion module (4) comprises: a direct current power supply chip (U1), a first resistor (R1) and a second resistor (R2);
an input end (Vin) of the direct current power supply chip (U1) is an input end of the voltage conversion module (4), and an output end (Vout) of the direct current power supply chip (U1) is an output end of the voltage conversion module (4);
one end of the first resistor (R1) is connected to the input end (Vin) of the DC power supply chip (U1), and the other end of the first resistor (R1) is connected to the enable End (EN) of the DC power supply chip (U1);
the second resistor (R2) is connected between the other end of the first resistor (R1) and ground;
the first resistor (R1) and the second resistor (R2) are configured to provide a bias voltage to an enable terminal (EN) of the DC power supply chip (U1);
the direct current power supply chip (U1) responds to the bias voltage received by the enable terminal (EN) thereof, converts the first direct current power supply received by the input terminal (Vin) of the direct current power supply chip (U1) into the second direct current power supply, and outputs the second direct current power supply through the output terminal (Vout) of the direct current power supply chip (U1).
4. An inter-board supply circuit according to claim 3, characterized in that said voltage conversion module (4) further comprises:
an energy storage inductor (L1) connected between the output end (Vout) of the direct current power supply chip (U1) and the front USB (21);
and one end of the energy storage capacitor (C6) is connected between the energy storage inductor (L1) and the preposed USB (21) connection point, and the other end of the energy storage capacitor (C6) is connected to the ground.
5. The board-to-board power supply circuit according to claim 4, characterized in that said voltage conversion module (4) further comprises:
and the feedback resistor (R5) is connected between the preposed USB (21) and the feedback end (FB) of the direct current power supply chip (U1) so as to feed back the voltage output by the energy storage inductor (L1) to the feedback end (FB) of the direct current power supply chip (U1).
6. The board-to-board power supply circuit according to claim 5, characterized in that said voltage conversion module (4) further comprises:
a bias resistor (R6) having one end connected to a connection point of the feedback terminal (FB) and the feedback resistor (R5), and the other end of the bias resistor (R6) connected to ground; the bias resistor (R6) is used for providing bias voltage to the feedback terminal (FB).
7. The board-to-board power supply circuit according to claim 4, characterized in that said voltage conversion module (4) further comprises:
a freewheeling diode (D1), the anode of the freewheeling diode (D1) is grounded, and the cathode of the freewheeling diode (D1) is connected between the connection point of the energy storage inductor (L1) and the output terminal (Vout) of the DC power supply chip (U1).
8. The utility model provides a leading circuit board, leading circuit board is used for the system mainboard data interaction with the all-in-one, be provided with leading USB on the leading circuit board, its characterized in that still includes:
an inter-board power supply circuit as claimed in any one of claims 1 to 7.
9. An all-in-one machine circuit board comprising: system mainboard and leading circuit board, system mainboard with the electricity connection can be dismantled to leading circuit board, its characterized in that still includes:
an inter-board power supply circuit as claimed in any one of claims 1 to 7.
10. An all-in-one machine, comprising:
the all-in-one circuit board of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021248382.7U CN212381134U (en) | 2020-06-30 | 2020-06-30 | Inter-board power supply circuit, front circuit board, all-in-one machine circuit board and all-in-one machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021248382.7U CN212381134U (en) | 2020-06-30 | 2020-06-30 | Inter-board power supply circuit, front circuit board, all-in-one machine circuit board and all-in-one machine |
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| Publication Number | Publication Date |
|---|---|
| CN212381134U true CN212381134U (en) | 2021-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021248382.7U Active CN212381134U (en) | 2020-06-30 | 2020-06-30 | Inter-board power supply circuit, front circuit board, all-in-one machine circuit board and all-in-one machine |
Country Status (1)
| Country | Link |
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| CN (1) | CN212381134U (en) |
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