CN220830391U - Power supply device and display screen receiving card - Google Patents

Abstract

The utility model discloses a power supply device and a display screen receiving card. The power supply device comprises a first-stage power supply module, a second-stage power supply module and a delay power-on module; the first-stage power supply module is configured to convert a power supply voltage into a first power supply voltage; the second-stage power supply module comprises a second power supply unit and a third power supply unit, the input end of the second power supply unit is connected with the output end of the first-stage power supply module, and the second power supply unit is configured to convert the first power supply voltage into a second power supply voltage; the input end of the third power supply unit is connected with the output end of the first-stage power supply module, and the third power supply unit is configured to convert the first power supply voltage into a third power supply voltage; the time-delay power-on module is configured to enable the second power supply unit and/or the third power supply unit after the duration of outputting the first power supply voltage by the first-stage power supply module reaches a preset duration. The technical scheme of the utility model can avoid burning the whole power supply device when the power supply voltage is over-voltage or overshot, and avoid damaging the electric appliance.

Description

Power supply device and display screen receiving card

Technical Field

The present utility model relates to the field of power technologies, and in particular, to a power supply device and a display screen receiving card.

Background

A light-emitting diode (LED) display screen has the characteristics of low cost and good definition, and thus is widely used.

The LED display screen comprises a plurality of LED modules, each LED module comprises a plurality of LED lamp beads, and in order to control the LED display screen to display preset images, an LED receiving card and an LED sending card are required to be used. The LED transmitting card converts the image signal in the computer into a control signal and transmits the control signal to the LED receiving card. The LED receiving card decodes the control signals and outputs the control signals to each LED module, so that the LED display screen displays preset images.

The power supply module is arranged in the LED receiving card to supply power for the processor in the LED receiving card, but the power supply voltage of the power supply module of the LED receiving card can burn the power supply module when overvoltage or overshoot occurs, and the processing module in the LED receiving card can be damaged.

Disclosure of utility model

The utility model provides a power supply device and a display screen receiving card, which are used for solving the problem that a power supply module of an LED receiving card can be burnt when the power supply voltage of the power supply module of the LED receiving card is over-voltage or overshot, and a processing module in the LED receiving card can be damaged.

According to an aspect of the present utility model, there is provided a power supply apparatus including:

The first-stage power supply module is connected with a power supply voltage and is configured to convert the power supply voltage into a first power supply voltage;

The second-stage power supply module comprises a second power supply unit and a third power supply unit, wherein the input end of the second power supply unit is connected with the output end of the first-stage power supply module, and the second power supply unit is configured to convert the first power supply voltage into a second power supply voltage; the input end of the third power supply unit is connected with the output end of the first-stage power supply module, and the third power supply unit is configured to convert the first power supply voltage into a third power supply voltage;

The delay power-on module is connected with the enabling end of the second power supply unit and/or the enabling end of the third power supply unit, and is configured to enable the second power supply unit and/or the third power supply unit after the duration of outputting the first power supply voltage by the first-stage power supply module reaches the preset duration.

Optionally, the power supply device further includes:

The reverse connection preventing module is connected between the power supply end and the input end of the first-stage power supply module; wherein the power supply terminal is configured to provide the power supply voltage.

Optionally, the anti-reverse connection module comprises a double-channel MOS tube;

The grid electrode of the double-circuit MOS tube is grounded, the drain electrode of the double-circuit MOS tube is electrically connected with the power supply end, and the source electrode of the double-circuit MOS tube is electrically connected with the input end of the first-stage power supply module.

Optionally, the power supply device further comprises a first adjustment module and/or a second adjustment module;

The first adjusting module is electrically connected with the adjusting end of the second power supply unit and is configured to adjust the voltage value of the second power supply voltage output by the second power supply unit;

The second adjusting module is electrically connected with the adjusting end of the third power supply unit, and is configured to adjust the voltage value of the third power supply voltage output by the third power supply unit.

Optionally, the first adjustment module includes a first resistor and a second resistor;

The first end of the first resistor is grounded, and the second end of the first resistor is electrically connected with the adjusting end of the second power supply unit;

The first end of the second resistor is electrically connected with the second end of the first resistor, and the second end of the second resistor is electrically connected with the output end of the second power supply unit;

And/or, the second adjustment module comprises a third resistor and a fourth resistor;

The first end of the third resistor is grounded, and the second end of the third resistor is electrically connected with the adjusting end of the third power supply unit;

the first end of the fourth resistor is electrically connected with the second end of the third resistor, and the second end of the fourth resistor is electrically connected with the output end of the third power supply unit.

Optionally, the first adjustment module includes a first switch unit, a first voltage dividing unit, a second voltage dividing unit, and a third voltage dividing unit;

The first end of the first voltage division unit is electrically connected with the adjusting end of the second power supply unit, and the second end of the first voltage division unit is electrically connected with the first end of the first switch unit; the second end of the first switch unit is electrically connected with the output end of the second power supply unit;

The first end of the second voltage division unit is electrically connected with the adjusting end of the second power supply unit, and the second end of the second voltage division unit is electrically connected with the third end of the first switch unit; the fourth end of the first switch unit is electrically connected with the output end of the second power supply unit;

The first end of the third voltage division unit is electrically connected with the adjusting end of the second power supply unit, and the second end of the third voltage division unit is electrically connected with the fifth end of the first switch unit; the sixth end of the first switch unit is electrically connected with the output end of the second power supply unit;

And/or the second adjusting module comprises a second switch unit, a fourth voltage dividing unit, a fifth voltage dividing unit and a sixth voltage dividing unit;

the first end of the fourth voltage division unit is electrically connected with the adjusting end of the third power supply unit, and the second end of the fourth voltage division unit is electrically connected with the first end of the second switch unit; the second end of the second switch unit is electrically connected with the output end of the third power supply unit;

The first end of the fifth voltage division unit is electrically connected with the adjusting end of the third power supply unit, and the second end of the fifth voltage division unit is electrically connected with the third end of the second switch unit; the fourth end of the second switch unit is electrically connected with the output end of the third power supply unit;

The first end of the sixth voltage division unit is electrically connected with the adjusting end of the third power supply unit, and the second end of the sixth voltage division unit is electrically connected with the fifth end of the second switch unit; the sixth end of the second switch unit is electrically connected with the output end of the third power supply unit.

Optionally, the first stage power module includes a DC-DC power chip;

The input end of the DC-DC power supply chip is connected with the power supply voltage, and the output end of the DC-DC power supply chip is electrically connected with the input end of the second power supply unit and the input end of the third power supply unit respectively;

The second power supply unit comprises a first LDO power supply chip, and the input end of the first LDO power supply chip is connected with the output end of the first-stage power supply module;

The third power supply voltage comprises a second LDO power supply chip, and the input end of the second LDO power supply chip is connected with the output end of the first-stage power supply module.

Optionally, the power supply device further comprises a voltage stabilizing module;

The first end of the voltage stabilizing module is grounded, and the second end of the voltage stabilizing module is electrically connected with the output end of the reverse connection preventing module;

And/or, the power supply device further comprises a clamping module;

the first end of the clamping module is grounded, and the second end of the clamping module is electrically connected with the output end of the first-stage power supply module.

Optionally, the power supply device further comprises an energy storage module;

the first end of the energy storage module is grounded, and the second end of the energy storage module is electrically connected with the output end of the anti-reverse connection module;

And/or, the power supply device further comprises a first filtering module; the first end of the first filtering module is grounded, and the second end of the first filtering module is electrically connected with the output end of the reverse connection preventing module;

and/or, the power supply device further comprises a second filtering module; the first end of the second filtering module is grounded, and the second end of the second filtering module is electrically connected with the input end of the first-stage power supply module;

And/or, the power supply device further comprises a third filtering module; the first end of the third filtering module is grounded, and the second end of the third filtering module is electrically connected with the output end of the first-stage power supply module;

And/or, the power supply device further comprises a fourth filtering module; the first end of the fourth filtering module is grounded, and the second end of the fourth filtering module is electrically connected with the input end of the second power supply unit;

And/or, the power supply device further comprises a fifth filtering module; the first end of the fifth filtering module is grounded, and the second end of the fifth filtering module is electrically connected with the output end of the second power supply unit;

And/or, the power supply device further comprises a sixth filtering module; the first end of the sixth filtering module is grounded, and the second end of the sixth filtering module is electrically connected with the input end of the third power supply unit;

And/or, the power supply device further comprises a seventh filtering module; the first end of the seventh filtering module is grounded, and the second end of the seventh filtering module is electrically connected with the output end of the third power supply unit.

According to another aspect of the present utility model, there is provided a display screen receiving card including the power supply device according to any one of the embodiments of the present utility model, further including a processor;

The power supply device is connected with a power supply end of the processor and is configured to provide a power supply voltage for the processor.

According to the technical scheme, the power supply device is divided into the first-stage power supply module and the second-stage power supply module, and the second power supply voltage and the third power supply voltage output by the second-stage power supply module supply power for the electric devices, so that the first-stage power supply module is only damaged when the power supply voltage is over-voltage or overshoots, and the first-stage power supply module is disconnected from the second-stage power supply module after being damaged, and the effect of protecting the second-stage power supply module and the electric devices is achieved. And through setting up the time delay power-on module, the time delay power-on module just can enable second power supply unit and/or third power supply unit after the duration of first power supply module output first power supply voltage reaches the preset duration for after the first power supply module output is stable, the third power supply unit just can work, thereby has improved power supply unit's reliability. In addition, the first-stage power supply module can be prevented from outputting larger current or larger voltage to the third power supply unit when the first-stage power supply module is in overcurrent and is not burnt, and the effect of protecting the third power supply unit is achieved. In this way, the whole power supply device can be prevented from being burnt when the power supply voltage is over-voltage or overshot, and the electric appliance (the processing module in the LED receiving card) is prevented from being damaged.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of a power supply device according to an embodiment of the present utility model;

fig. 2 is a schematic circuit diagram of another power supply device according to an embodiment of the present utility model;

Fig. 3 is a schematic circuit diagram of another power supply device according to an embodiment of the present utility model;

fig. 4 is a schematic circuit diagram of a display screen receiving card according to an embodiment of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The power supply module is arranged in the LED receiving card to supply power for the processor in the LED receiving card, the power supply module generally uses a DC-DC power supply or an LDO power supply, if the power supply voltage of the power supply module is over-voltage or overshoots, a power supply chip can be directly burnt out, the repair cost is high, and the processor (an electric device) can be damaged.

In view of the above technical problems, the present utility model provides a power supply device. Fig. 1 is a schematic circuit diagram of a power supply device according to an embodiment of the present utility model, and referring to fig. 1, the power supply device includes a first stage power supply module 110, a second stage power supply module 120, and a delay power-up module 130; the first-stage power supply module 110 is connected to a power supply voltage, and the first-stage power supply module 110 is configured to convert the power supply voltage V0 into a first power supply voltage V1; the second stage power supply module 120 includes a second power supply unit 121 and a third power supply unit 122, an input terminal of the second power supply unit 121 is connected to an output terminal of the first stage power supply module 110, and the second power supply unit 121 is configured to convert the first power supply voltage V1 into a second power supply voltage V2; an input end of the third power supply unit 122 is connected to an output end of the first stage power supply module 110, and the third power supply unit 122 is configured to convert the first power supply voltage V1 into a third power supply voltage V3; the delay power-up module 130 is connected to the enable end EN of the second power supply unit 121 and/or the third power supply unit 122, and the delay power-up module 130 is configured to enable the second power supply unit 121 and/or the third power supply unit 122 after the duration of outputting the first power supply voltage V1 by the first stage power supply module 110 reaches the preset duration.

The first stage power module 110 converts the power supply voltage V0, outputs a first power supply voltage V1, the second power supply unit 121 converts the first power supply voltage V1 into a second power supply voltage V2, the third power supply unit 122 converts the first power supply voltage V1 into a third power supply voltage V3, and transmits the second power supply voltage V2 and the third power supply voltage V3 to the electric device to supply power to the electric device, so that the electric device can work normally. When the first power supply voltage V1 is required to supply power to the electric device, the first power supply voltage V1 may also be transmitted to the electric device. The power consumption device can be a processor in the LED receiving card or other power consumption devices. The power supply device of the embodiment can be on the same printed circuit board as the electric device; the power supply device can also be an independent printed circuit board, so that the power supply device can supply power for different electric appliances, and the applicability of the power supply device is improved.

Specifically, the first stage power module 110 may convert the supply voltage V0, for example, step down, and then output the first supply voltage V1. The second stage power module 120 further converts the first power voltage V1, for example, steps down, that is, the second power unit 121 steps down the first power voltage V1 and outputs the second power voltage V2, and the third power unit 122 steps down the first power voltage V1 and outputs the third power voltage V3. The voltage values of the second power supply voltage V2 and the third power supply voltage V3 may be the same or different. Illustratively, the first stage power supply module 110 converts the 5V power supply voltage V0 into a 3.3V first power supply voltage V1, the second power supply unit 121 converts the 3.3V first power supply voltage V1 into a 2.5V second power supply voltage V2, and the third power supply unit 122 converts the 3.3V first power supply voltage V1 into a 1.2V third power supply voltage V3. Thus, when the power supply voltage V0 is over-voltage or overshot, the first-stage power supply module 110 is only damaged, and after the first-stage power supply module 110 is damaged, the connection with the second-stage power supply module 120 is disconnected, so that the second-stage power supply module 120 cannot be damaged, an electric device cannot be damaged, and the effect of protecting the electric device is achieved. Moreover, when the power supply voltage V0 is damaged due to overvoltage or overshoot, only the first-stage power supply module 110 is required to be maintained, and the second power supply unit 121 and the third power supply unit 122 are not required to be maintained, so that the effect of saving cost is achieved.

In some embodiments, the enabling end of the second power unit 121 is connected to the delay power-on module 130, and the delay power-on module 130 enables the second power unit 121 after the duration of outputting the first power voltage V1 by the first-stage power module 110 reaches the preset duration, so that the second power unit 121 can work after the output of the first-stage power module 110 is stable, thereby improving the reliability of the power device. Moreover, the first stage power module 110 can be prevented from outputting a larger current or a larger voltage to the second power unit 121 when it is not burned out, so as to achieve the effect of protecting the second power unit 121.

In some embodiments, the enabling end of the third power unit 122 is connected to the delay power-up module 130, and the delay power-up module 130 enables the third power unit 122 after the duration of outputting the first power voltage V1 by the first stage power module 110 reaches the preset duration, so that the third power unit 122 can work after the output of the first stage power module 110 is stable, thereby improving the reliability of the power device. Moreover, the first stage power module 110 can be prevented from outputting a larger current or a larger voltage to the third power unit 122 when it is not burned out, so as to achieve the effect of protecting the third power unit 122.

In some embodiments, the enabling ends of the second power unit 121 and the third power unit 122 are both connected to the delayed power-on module 130, and the delayed power-on modules 130 connected to the enabling ends of the second power unit 121 and the third power unit 122 may be the same or different. When the delay power-on modules 130 connected to the enabling ends of the second power supply unit 121 and the third power supply unit 122 are different, the second power supply unit 121 and the third power supply unit 122 can output the power supply voltage in a time-sharing manner, so that the third power supply voltage V3 is input after the second power supply voltage V2 is input to the electric device to be stable, or the second power supply voltage V2 is input after the third power supply voltage V3 is input to the electric device to be stable, the stability of power supply of the electric device is guaranteed, and the effect of further protecting the electric device is achieved.

According to the technical scheme, the power supply device is divided into the first-stage power supply module and the second-stage power supply module, the second power supply voltage and the third power supply voltage output by the second-stage power supply module supply power for the electric appliance, so that the first-stage power supply module is only damaged when the power supply voltage is over-voltage or overshoots, and the first-stage power supply module is disconnected with the second-stage power supply module after being damaged, and the effect of protecting the second-stage power supply module and the electric appliance is achieved. And through setting up the time delay power-on module, the time delay power-on module just can enable second power supply unit and/or third power supply unit after the duration of first power supply module output first power supply voltage reaches the preset duration for after the first power supply module output is stable, the third power supply unit just can work, thereby has improved power supply unit's reliability. In addition, the first-stage power supply module can be prevented from outputting larger current or larger voltage to the third power supply unit when the first-stage power supply module is in overcurrent and is not burnt, and the effect of protecting the third power supply unit is achieved. In this way, the whole power supply device can be prevented from being burnt when the power supply voltage is over-voltage or overshot, and the electric appliance (the processing module in the LED receiving card) is prevented from being damaged.

On the basis of the above technical solution, fig. 2 is a schematic circuit diagram of another power supply device according to an embodiment of the present utility model, optionally, referring to fig. 2, the power supply device further includes an anti-reverse connection module 140, where the anti-reverse connection module 140 is connected between the power supply terminal CN1 and the input terminal of the first stage power supply module 110; wherein the power supply terminal CN1 is configured to provide a power supply voltage V0. Thus, by providing the reverse connection preventing module 140, damage to the power supply device caused by reverse connection of the power supply voltage is prevented.

Optionally, as shown in fig. 2, a fuse F1 may be further disposed between the anti-reverse connection module 140 and the power supply terminal CN1, so that when the voltage or current of the power supply terminal CN1 is large, the power can be timely turned off, which is beneficial to protecting the power supply device.

Optionally, as shown in fig. 2, the anti-reverse connection module 140 includes a dual-path MOS tube U1; the grid electrode of the two-way MOS tube U1 is grounded, the drain electrode of the two-way MOS tube U1 is electrically connected with the power supply end CN1, and the source electrode of the two-way MOS tube U1 is electrically connected with the input end of the first-stage power supply module 110.

Specifically, by providing the two-way MOS transistor U1, when the power supply voltage is being connected, the two-way MOS transistor U1 is turned on, and outputs the power supply voltage V0 to the first stage power supply module 110. When the power supply voltage is reversely connected, the two-way MOS tube U1 is cut off, and the power supply voltage V0 is not output to the first-stage power supply module 110, so that the effect of protecting the power supply device is achieved.

Optionally, as shown in fig. 2, the power supply device further includes a first adjustment module 150 and/or a second adjustment module 160; the first adjusting module 150 is electrically connected to the adjusting end of the second power unit 121, and the first adjusting module 150 is configured to adjust the voltage value of the second power voltage V2 output by the second power unit 121; the second adjusting module 160 is electrically connected to the adjusting terminal of the third power unit 122, and the second adjusting module 160 is configured to adjust the voltage value of the third power voltage V3 output by the third power unit 122.

Specifically, by providing the first adjustment module 150, the first adjustment module 150 can adjust the potential of the second power supply unit 121, and when the potential of the second power supply unit 121 changes, the voltage value of the second power supply voltage V2 output by the second power supply unit 121 also changes. Accordingly, the first adjustment module 150 may adjust the voltage value of the second power supply unit 121. Similarly, the second adjustment module 160 may adjust the voltage value of the third power voltage V3 output by the third power unit 122. The second power supply unit 121 and the third power supply unit 122 output a stable power supply voltage while the first and second regulation modules 150 and 160 output a fixed voltage.

Note that, when the power supply device is not provided with the second adjustment module 160, the adjustment end of the third power supply unit 122 may be grounded. In fig. 2, the third power supply unit 122 is connected to the second adjustment module 160 by a dotted line, which means that the adjustment end of the third power supply unit 122 may be connected to the second adjustment module 160 or may not be connected to the second adjustment module 160, which is not limited in this embodiment.

The following describes possible configurations of the first adjustment module and the second adjustment module, but is not a limitation of the present application.

In some embodiments, optionally, referring to fig. 2, the first adjustment module 150 includes a first resistor R1 and a second resistor R2; the first end of the first resistor R1 is grounded, and the second end of the first resistor R1 is electrically connected with the adjusting end of the second power supply unit 121; the first end of the second resistor R2 is electrically connected with the second end of the first resistor R1, and the second end of the second resistor R2 is electrically connected with the output end of the second power supply unit 121;

and/or, the second adjustment module 160 includes a third resistor R3 and a fourth resistor R4; the first end of the third resistor R3 is grounded, and the second end of the third resistor R3 is electrically connected to the adjustment end of the third power supply unit 122; the first end of the fourth resistor R4 is electrically connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 is electrically connected to the output end of the third power supply unit 122.

Specifically, by setting the first resistor R1 and the second resistor R2, the voltage of the adjustment terminal of the second power supply unit 121 can be adjusted, and thus the voltage of the output terminal of the second power supply unit 121, that is, the voltage value of the second power supply voltage V2 output by the second power supply unit 121 can be adjusted. Similarly, by setting the third resistor R3 and the fourth resistor R4, the voltage value of the third power supply voltage V3 output by the third power supply unit 122 can be adjusted, so as to output the second power supply voltage and the third power supply voltage required by the electric device, and facilitate power supply for the electric device.

In some implementations, fig. 3 is a schematic circuit diagram of still another power supply device according to an embodiment of the present utility model, optionally, referring to fig. 3, the first adjustment module 150 includes a first switch unit 151, a first voltage dividing unit 152, a second voltage dividing unit 153, and a third voltage dividing unit 154; a first end of the first voltage division unit 152 is electrically connected to the adjustment end of the second power supply unit 121, and a second end of the first voltage division unit 152 is electrically connected to the first end of the first switching unit 151; a second end of the first switching unit 151 is electrically connected to an output end of the second power supply unit 121; the first end of the second voltage division unit 153 is electrically connected with the adjustment end of the second power supply unit 121, and the second end of the second voltage division unit 153 is electrically connected with the third end of the first switch unit 151; the fourth terminal of the first switching unit 151 is electrically connected to the output terminal of the second power supply unit 121; a first end of the third voltage division unit 154 is electrically connected to the adjustment end of the second power supply unit 121, and a second end of the third voltage division unit 154 is electrically connected to the fifth end of the first switching unit 151; a sixth end of the first switching unit 151 is electrically connected to an output end of the second power supply unit 121;

And/or, the second adjustment module 160 includes a second switching unit 161, a fourth voltage division unit 162, a fifth voltage division unit 163, and a sixth voltage division unit 164; the first end of the fourth voltage division unit 162 is electrically connected to the adjustment end of the third power supply unit 122, and the second end of the fourth voltage division unit 162 is electrically connected to the first end of the second switch unit 161; a second end of the second switching unit 161 is electrically connected to an output end of the third power supply unit 122; a first end of the fifth voltage division unit 163 is electrically connected to the adjustment end of the third power supply unit 122, and a second end of the fifth voltage division unit 163 is electrically connected to the third end of the second switching unit 161; a fourth terminal of the second switching unit 161 is electrically connected to an output terminal of the third power supply unit 122; a first end of the sixth voltage division unit 164 is electrically connected to the adjustment end of the third power supply unit 122, and a second end of the sixth voltage division unit 164 is electrically connected to the fifth end of the second switching unit 161; a sixth terminal of the second switching unit 161 is electrically connected to an output terminal of the third power supply unit 122.

The first switching unit 151 may include a dial switch, for example. The first voltage dividing unit 152 may include a fifth resistor R5 and a sixth resistor R6, a first end of the fifth resistor R5 is grounded, a second end of the fifth resistor R5 is electrically connected to the adjustment end of the second power supply unit 121, a second end of the fifth resistor R5 is electrically connected to a first end of the sixth resistor R6, and a second end of the sixth resistor R6 is electrically connected to a first end of the first switching unit 151. The second voltage division unit 153 may include a seventh resistor R7 and an eighth resistor R8, a first end of the seventh resistor R7 is grounded, a second end of the seventh resistor R7 is electrically connected to the adjustment end of the second power supply unit 121, a second end of the seventh resistor R7 is electrically connected to a first end of the eighth resistor R8, and a second end of the eighth resistor R8 is electrically connected to a third end of the first switching unit 151. The third voltage division unit 154 may include a ninth resistor R9 and a tenth resistor R10, a first end of the ninth resistor R9 being grounded, a second end of the ninth resistor R9 being electrically connected to the adjustment end of the second power supply unit 121, a second end of the ninth resistor R9 being electrically connected to a first end of the tenth resistor R10, a second end of the tenth resistor R10 being electrically connected to a fifth end of the first switching unit 151.

Specifically, by providing the first switching unit 151, when the first terminal of the first switching unit 151 and the second terminal of the first switching unit 151 are turned on, the first voltage dividing unit 152 is connected to the output terminal of the second power supply unit 121, so that the voltage value of the second power supply voltage V2 output by the second power supply unit 121 is determined by the resistance value of the first voltage dividing unit 152. When the third terminal of the first switching unit 151 and the fourth terminal of the first switching unit 151 are turned on, the second voltage dividing unit 153 is connected to the output terminal of the second power supply unit 121 such that the voltage value of the second power supply voltage V2 outputted by the second power supply unit 121 is determined by the resistance value of the second voltage dividing unit 153. When the fifth terminal of the first switching unit 151 and the sixth terminal of the first switching unit 151 are turned on, the third voltage dividing unit 154 is connected to the output terminal of the second power supply unit 121 such that the voltage value of the second power supply voltage V2 output by the second power supply unit 121 is determined by the resistance value of the third voltage dividing unit 154. Thus, the on state of the first switching unit 151 can be set according to the power supply requirement of the electric device, thereby controlling the voltage value of the second power supply voltage V2 output by the second power supply unit 121.

The second switching unit 161 may include a dial switch, for example. The fourth voltage dividing unit 162 may include an eleventh resistor R11 and a twelfth resistor R12, a first end of the eleventh resistor R11 being grounded, a second end of the eleventh resistor R11 being electrically connected to the adjustment end of the third power supply unit 122, a second end of the eleventh resistor R11 being electrically connected to the first end of the twelfth resistor R12, and a second end of the twelfth resistor R12 being electrically connected to the first end of the second switching unit 161. The fifth voltage dividing unit 163 may include a thirteenth resistor R13 and a fourteenth resistor R14, the first terminal of the thirteenth resistor R13 is grounded, the second terminal of the thirteenth resistor R13 is electrically connected to the adjustment terminal of the third power supply unit 122, the second terminal of the thirteenth resistor R13 is electrically connected to the first terminal of the fourteenth resistor R14, and the second terminal of the fourteenth resistor R14 is electrically connected to the third terminal of the second switching unit 161. The sixth voltage dividing unit 164 may include a fifteenth resistor R15 and a sixteenth resistor R16, the first terminal of the fifteenth resistor R15 is grounded, the second terminal of the fifteenth resistor R15 is electrically connected to the adjustment terminal of the third power supply unit 122, the second terminal of the fifteenth resistor R15 is electrically connected to the first terminal of the sixteenth resistor R16, and the second terminal of the sixteenth resistor R16 is electrically connected to the fifth terminal of the second switching unit 161.

Specifically, by providing the second switching unit 161, when the first terminal of the second switching unit 161 and the second terminal of the second switching unit 161 are turned on, the fourth voltage dividing unit 162 is connected to the output terminal of the third power supply unit 122, so that the voltage value of the third power supply voltage V3 outputted by the third power supply unit 122 is determined by the resistance value of the fourth voltage dividing unit 162. When the third terminal of the second switching unit 161 and the fourth terminal of the second switching unit 161 are turned on, the fifth voltage dividing unit 163 is connected to the output terminal of the third power supply unit 122 such that the voltage value of the third power supply voltage V3 outputted by the third power supply unit 122 is determined by the resistance value of the fifth voltage dividing unit 163. When the fifth terminal of the second switching unit 161 and the sixth terminal of the second switching unit 161 are turned on, the sixth voltage dividing unit 164 is connected to the output terminal of the third power supply unit 122 such that the voltage value of the third power supply voltage V3 outputted by the third power supply unit 122 is determined by the resistance value of the sixth voltage dividing unit 164. Accordingly, the on state of the second switching unit 161 can be set according to the power supply demand of the electric device, thereby controlling the voltage value of the third power supply voltage V3 outputted from the third power supply unit 122.

Alternatively, referring to fig. 2 or 3, the first stage power module 110 includes a DC-DC power chip U2; the input end of the DC-DC power supply chip U2 is connected with a power supply voltage V0, and the output end of the DC-DC power supply chip U2 is electrically connected with the input end of the second power supply unit 121 and the input end of the third power supply unit 122 respectively; the second power supply unit 121 includes a first LDO power supply chip U3, and an input terminal of the first LDO power supply chip U3 is connected to an output terminal of the first stage power supply module 110; the third power supply voltage 122 includes a second LDO power supply chip U4, and an input terminal of the second LDO power supply chip U4 is connected to an output terminal of the first stage power supply module 110.

The DC-DC power chip U2 is a direct current-to-direct current converter (DC-to-DC converter) and can convert the direct current of the power supply voltage V0 into the first power supply voltage V1. The LDO power chip is a low dropout linear regulator (low dropout regulator).

Specifically, when the supply voltage V0 is over-voltage or overshot, the DC-DC power supply chip U2 burns out and turns off, achieving the effect of including the first LDO power supply chip U3 and the second LDO power supply chip U4. And after the voltage conversion of the DC-DC power supply chip U2, the output first power supply voltage V1 is smaller, so that the input voltage of the first LDO power supply chip U3 and the second LDO power supply chip U4 is smaller, the input and output voltage drops of the first LDO power supply chip U3 and the second LDO power supply chip U4 are lower, the heating of the first LDO power supply chip U3 and the second LDO power supply chip U4 is obviously reduced, and the work is more stable in an outdoor high-temperature environment. Therefore, the problems that when only an LDO power supply is used, the LDO input voltage is high, the heating is easy to be serious, the normal operation of a circuit is influenced by overhigh crystal junction temperature, and the normal operation of an LED receiving card is influenced are avoided.

Optionally, referring to fig. 2 or 3, the power supply apparatus further includes a voltage stabilizing module 170; the first end of the voltage stabilizing module 170 is grounded, and the second end of the voltage stabilizing module 170 is electrically connected with the output end of the anti-reverse connection module 140;

and/or the power supply device further includes a clamping module 180; the first end of the clamping module 180 is grounded, and the second end of the clamping module 180 is electrically connected to the output end of the first stage power module 110.

Specifically, by setting the voltage stabilizing module 170, the anti-reverse connection module 140 outputs a stable power supply voltage V0, so that the first-stage power supply module 110 and the second-stage power supply module 120 can output stable voltages conveniently, which is beneficial to better power supply for electric equipment.

By arranging the clamping module 180, the first power supply voltage V1 output by the first-stage power supply module 110 is clamped, so that the situation that the voltage value of the first power supply voltage V1 is large is avoided, and the second-stage power supply module 120 and the electric device are protected.

Alternatively, referring to fig. 2 or 3, the voltage stabilizing module 170 includes a voltage stabilizing diode D1, a first pole of the voltage stabilizing diode D1 is grounded, and a second pole of the voltage stabilizing diode D1 is electrically connected to the output terminal of the anti-reverse connection module 140.

Alternatively, referring to fig. 2 or 3, the clamping module 180 includes a clamping diode D2, a first pole of the clamping diode D2 is grounded, and a second pole of the clamping diode D2 is electrically connected to an output terminal of the first stage power module 110.

Optionally, referring to fig. 2 or 3, the power supply device further includes an energy storage module 191; the first end of the energy storage module 191 is grounded, and the second end of the energy storage module 191 is electrically connected with the output end of the anti-reverse connection module 140; and/or the power supply device further comprises a first filtering module 192; the first end of the first filtering module 192 is grounded, and the second end of the first filtering module 192 is electrically connected with the output end of the anti-reverse connection module 140; and/or the power supply apparatus further includes a second filtering module 193; the first end of the second filter module 193 is grounded, and the second end of the second filter module 193 is electrically connected with the input end of the first stage power module 110; and/or the power supply device further comprises a third filtering module 194; the first end of the third filter module 194 is grounded, and the second end of the third filter module 194 is electrically connected with the output end of the first stage power module 110; and/or the power supply device further comprises a fourth filtering module 195; the first end of the fourth filtering module 195 is grounded, and the second end of the fourth filtering module 195 is electrically connected to the input end of the second power supply unit 121; and/or the power supply device further comprises a fifth filtering module 196; the first end of the fifth filtering module 196 is grounded, and the second end of the fifth filtering module 196 is electrically connected to the output end of the second power supply unit 121; and/or, the power supply device further includes a sixth filtering module 197; the first end of the sixth filtering module 197 is grounded, and the second end of the sixth filtering module 197 is electrically connected to the input end of the third power supply unit 122; and/or the power supply apparatus further includes a seventh filtering module 198; the first end of the seventh filtering module 198 is grounded, and the second end of the seventh filtering module 298 is electrically connected to the output of the third power supply unit 122.

Specifically, by setting the energy storage module 191, when the voltage output by the anti-reverse connection module 140 is insufficient, the energy storage module 191 supplements electricity, so that the unstable voltage input by the first-stage power supply module 110 is avoided when the power supply voltage output by the anti-reverse connection module 140 fluctuates, namely, the stability of the input voltage of the first-stage power supply module 110 is ensured, the stability of the output voltage of the second-stage power supply module 120 is further ensured, and the power supply device is better supplied with power.

By setting the first filtering module 192, clutter of the voltage output by the anti-reverse connection module 140 is filtered, and damage to the first stage power module 110 caused by a larger voltage is avoided. By providing the second filtering module 193, clutter is further filtered, which is beneficial to ensuring stability of the input voltage of the first stage power module 110. Likewise, by providing the third filter module 194 and the fourth filter module 195, noise of the voltage output by the first stage power source module 110 can be filtered, so as to ensure stability of the input voltage of the second power source unit 121. By arranging the fifth filtering module 196, clutter of the second power supply voltage V2 output by the second power supply unit 121 can be filtered, which is favorable for ensuring stability of the power supply voltage accessed by the electric device and avoiding damage to the electric device caused by larger voltage. Likewise, by providing the sixth filtering module 197, noise of the voltage output by the first stage power module 110 can be filtered, so as to ensure stability of the input voltage of the third power unit 122. By setting the seventh filtering module 198, clutter of the third power supply voltage V3 output by the third power supply unit 122 can be filtered, which is favorable for ensuring stability of the power supply voltage connected to the electric device and avoiding damage to the electric device caused by larger voltage.

On the basis of the above technical solutions, optionally, referring to fig. 2 or fig. 3, the delay power-on module 130 includes a first capacitor C1 and a seventeenth resistor R17, a first end of the first capacitor C1 is grounded, and a second end of the first capacitor C1 is connected to an enable end of the second power supply unit 121 and/or the third power supply unit 122; a first end of the seventeenth resistor R17 is connected to the first power voltage V1, and a second end of the seventeenth resistor R17 is electrically connected to the second end of the first capacitor C1. In this way, after the first stage power module 110 outputs the first power voltage V1, the first power voltage V1 charges the first capacitor C1, and after the first capacitor C1 is fully charged, the enabling terminal of the second power unit 121 and/or the third power unit 122 is powered, so that the second power unit 121 and/or the third power unit 122 is enabled.

Fig. 2 and 3 show only the case where the second power supply unit 121 is connected to the first capacitor C1, but are not limited thereto.

Alternatively, referring to fig. 2 or 3, the energy storage module 191 includes a second capacitor C2, a first pole of the second capacitor C2 is grounded, and a second pole of the second capacitor C2 is electrically connected to the output terminal of the anti-reverse connection module 140.

Optionally, referring to fig. 2 or 3, the first filtering module 192 includes a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6; the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6 are connected in parallel; the first pole of the third capacitor C3 is grounded, and the second pole of the third capacitor C3 is electrically connected to the output terminal of the anti-reverse connection module 140.

Optionally, referring to fig. 2 or 3, the second filtering module 193 includes a seventh capacitor C7 and an eighth capacitor C8; the seventh capacitor C7 and the eighth capacitor C8 are connected in parallel, a first pole of the seventh capacitor C7 is grounded, and a second pole of the seventh capacitor C7 is electrically connected to the input terminal of the first stage power module 110.

Optionally, referring to fig. 2 or 3, the third filtering module 194 includes a ninth capacitor C9 and a tenth capacitor C10; the ninth capacitor C9 and the tenth capacitor C10 are connected in parallel, a first pole of the ninth capacitor C9 is grounded, and a second pole of the ninth capacitor C9 is electrically connected to an output terminal of the first stage power supply module 110.

Optionally, referring to fig. 2 or 3, the fourth filtering module 195 includes an eleventh capacitor C11 and a twelfth capacitor C12; the eleventh capacitor C11 and the twelfth capacitor C12 are connected in parallel, a first pole of the eleventh capacitor C11 is grounded, and a second pole of the eleventh capacitor C11 is electrically connected to the input terminal of the second power supply unit 121.

Optionally, referring to fig. 2 or 3, the fifth filtering module 196 includes a thirteenth capacitor C13 and a fourteenth capacitor C14; the thirteenth capacitor C13 and the fourteenth capacitor C14 are connected in parallel, a first pole of the thirteenth capacitor C13 is grounded, and a second pole of the thirteenth capacitor C13 is electrically connected to the output terminal of the second power supply unit 121.

Optionally, referring to fig. 2 or 3, the sixth filtering module 197 includes a fifteenth capacitor C15 and a sixteenth capacitor C16; the fifteenth capacitor C15 and the sixteenth capacitor C16 are connected in parallel, a first pole of the fifteenth capacitor C15 is grounded, and a second pole of the fifteenth capacitor C15 is electrically connected to an input terminal of the third power supply unit 122.

Optionally, referring to fig. 2 or 3, the seventh filtering module 198 includes a seventeenth capacitor C17 and an eighteenth capacitor C18; the seventeenth capacitor C17 and the eighteenth capacitor C18 are connected in parallel, a first pole of the seventeenth capacitor C17 is grounded, and a second pole of the seventeenth capacitor C17 is electrically connected to an output terminal of the third power supply unit 122.

It should be noted that, the second stage power module 120 of the power supply device may supply power to the electric device, and the first stage power module 110 may also supply power to the electric device, which is not limited in this embodiment.

It should be noted that, when the third power unit 122 is connected to the delay power-up module 130, the specific structure of the delay power-up module 130 connected to the third power unit 122 may be the same as the specific structure of the delay power-up module 130 connected to the second power unit 121.

The embodiment also provides a display screen receiving card, fig. 4 is a schematic circuit diagram of a display screen receiving card provided by the embodiment of the utility model, and referring to fig. 4, the display screen receiving card includes the power supply device 10 provided by any embodiment, and further includes a processor 20; the power supply device 10 is connected to a power supply terminal of the processor 20, the power supply device 10 being configured to supply a power supply voltage to the processor 20.

Specifically, the display screen receiving card is, for example, an LED display screen receiving card. The processor 20 includes, for example, a field programmable gate array (Field Programmable GATE ARRAY, FPGA) chip. The processor 20 can control the decoding device in the display screen receiving card to decode the control signal sent by the LED sending card, and control the decoded information to be output to each LED module, so that the LED module emits light according to the control signal, and further the LED display screen displays a preset image. Fig. 4 shows a case where the second stage power module 120 of the power supply apparatus 10 supplies power to the processor 20, but is not limited thereto. When the first power voltage V1 of the power supply device 10 is needed to supply power to the processor 20, the output end of the first stage power module 110 may be connected to the power end of the processor 20, so that the first power voltage V1 output by the first stage power module 110 is transmitted to the processor 20.

The display screen receiving card of the present embodiment includes the power supply device 10 provided in any of the above embodiments, so that the display screen receiving card of the present embodiment has the same beneficial effects as the power supply device 10 provided in any of the above embodiments, and will not be described herein.

The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims (10)

1. A power supply device, comprising:

The first-stage power supply module is connected with a power supply voltage and is configured to convert the power supply voltage into a first power supply voltage;

The second-stage power supply module comprises a second power supply unit and a third power supply unit, wherein the input end of the second power supply unit is connected with the output end of the first-stage power supply module, and the second power supply unit is configured to convert the first power supply voltage into a second power supply voltage; the input end of the third power supply unit is connected with the output end of the first-stage power supply module, and the third power supply unit is configured to convert the first power supply voltage into a third power supply voltage;

The delay power-on module is connected with the enabling end of the second power supply unit and/or the enabling end of the third power supply unit, and is configured to enable the second power supply unit and/or the third power supply unit after the duration of outputting the first power supply voltage by the first-stage power supply module reaches the preset duration.

2. The power supply device according to claim 1, characterized by further comprising:

The reverse connection preventing module is connected between the power supply end and the input end of the first-stage power supply module; wherein the power supply terminal is configured to provide the power supply voltage.

3. The power supply device according to claim 2, wherein the anti-reverse connection module comprises a two-way MOS tube;

The grid electrode of the double-circuit MOS tube is grounded, the drain electrode of the double-circuit MOS tube is electrically connected with the power supply end, and the source electrode of the double-circuit MOS tube is electrically connected with the input end of the first-stage power supply module.

4. The power supply device according to claim 1, further comprising a first adjustment module and/or a second adjustment module;

The first adjusting module is electrically connected with the adjusting end of the second power supply unit and is configured to adjust the voltage value of the second power supply voltage output by the second power supply unit;

The second adjusting module is electrically connected with the adjusting end of the third power supply unit, and is configured to adjust the voltage value of the third power supply voltage output by the third power supply unit.

5. The power supply device of claim 4, wherein the first adjustment module comprises a first resistor and a second resistor;

The first end of the first resistor is grounded, and the second end of the first resistor is electrically connected with the adjusting end of the second power supply unit;

The first end of the second resistor is electrically connected with the second end of the first resistor, and the second end of the second resistor is electrically connected with the output end of the second power supply unit;

And/or, the second adjustment module comprises a third resistor and a fourth resistor;

The first end of the third resistor is grounded, and the second end of the third resistor is electrically connected with the adjusting end of the third power supply unit;

the first end of the fourth resistor is electrically connected with the second end of the third resistor, and the second end of the fourth resistor is electrically connected with the output end of the third power supply unit.

6. The power supply device according to claim 4, wherein the first adjustment module includes a first switching unit, a first voltage dividing unit, a second voltage dividing unit, and a third voltage dividing unit;

The first end of the first voltage division unit is electrically connected with the adjusting end of the second power supply unit, and the second end of the first voltage division unit is electrically connected with the first end of the first switch unit; the second end of the first switch unit is electrically connected with the output end of the second power supply unit;

The first end of the second voltage division unit is electrically connected with the adjusting end of the second power supply unit, and the second end of the second voltage division unit is electrically connected with the third end of the first switch unit; the fourth end of the first switch unit is electrically connected with the output end of the second power supply unit;

The first end of the third voltage division unit is electrically connected with the adjusting end of the second power supply unit, and the second end of the third voltage division unit is electrically connected with the fifth end of the first switch unit; the sixth end of the first switch unit is electrically connected with the output end of the second power supply unit;

And/or the second adjusting module comprises a second switch unit, a fourth voltage dividing unit, a fifth voltage dividing unit and a sixth voltage dividing unit;

the first end of the fourth voltage division unit is electrically connected with the adjusting end of the third power supply unit, and the second end of the fourth voltage division unit is electrically connected with the first end of the second switch unit; the second end of the second switch unit is electrically connected with the output end of the third power supply unit;

The first end of the fifth voltage division unit is electrically connected with the adjusting end of the third power supply unit, and the second end of the fifth voltage division unit is electrically connected with the third end of the second switch unit; the fourth end of the second switch unit is electrically connected with the output end of the third power supply unit;

The first end of the sixth voltage division unit is electrically connected with the adjusting end of the third power supply unit, and the second end of the sixth voltage division unit is electrically connected with the fifth end of the second switch unit; the sixth end of the second switch unit is electrically connected with the output end of the third power supply unit.

7. The power supply device of claim 1, wherein the first stage power supply module comprises a DC-DC power chip;

The input end of the DC-DC power supply chip is connected with the power supply voltage, and the output end of the DC-DC power supply chip is electrically connected with the input end of the second power supply unit and the input end of the third power supply unit respectively;

The second power supply unit comprises a first LDO power supply chip, and the input end of the first LDO power supply chip is connected with the output end of the first-stage power supply module;

The third power supply voltage comprises a second LDO power supply chip, and the input end of the second LDO power supply chip is connected with the output end of the first-stage power supply module.

8. The power supply device of claim 2, further comprising a voltage regulator module;

The first end of the voltage stabilizing module is grounded, and the second end of the voltage stabilizing module is electrically connected with the output end of the reverse connection preventing module;

And/or, the power supply device further comprises a clamping module;

the first end of the clamping module is grounded, and the second end of the clamping module is electrically connected with the output end of the first-stage power supply module.

9. The power supply device of claim 2, further comprising an energy storage module;

the first end of the energy storage module is grounded, and the second end of the energy storage module is electrically connected with the output end of the anti-reverse connection module;

And/or, the power supply device further comprises a first filtering module; the first end of the first filtering module is grounded, and the second end of the first filtering module is electrically connected with the output end of the reverse connection preventing module;

and/or, the power supply device further comprises a second filtering module; the first end of the second filtering module is grounded, and the second end of the second filtering module is electrically connected with the input end of the first-stage power supply module;

And/or, the power supply device further comprises a third filtering module; the first end of the third filtering module is grounded, and the second end of the third filtering module is electrically connected with the output end of the first-stage power supply module;

And/or, the power supply device further comprises a fourth filtering module; the first end of the fourth filtering module is grounded, and the second end of the fourth filtering module is electrically connected with the input end of the second power supply unit;

And/or, the power supply device further comprises a fifth filtering module; the first end of the fifth filtering module is grounded, and the second end of the fifth filtering module is electrically connected with the output end of the second power supply unit;

And/or, the power supply device further comprises a sixth filtering module; the first end of the sixth filtering module is grounded, and the second end of the sixth filtering module is electrically connected with the input end of the third power supply unit;

And/or, the power supply device further comprises a seventh filtering module; the first end of the seventh filtering module is grounded, and the second end of the seventh filtering module is electrically connected with the output end of the third power supply unit.

10. A display screen receiving card comprising the power supply device of any one of claims 1-9, further comprising a processor;

The power supply device is connected with a power supply end of the processor and is configured to provide a power supply voltage for the processor.