CN215378451U - Power supply circuit, power supply device and display screen - Google Patents
Power supply circuit, power supply device and display screen Download PDFInfo
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- CN215378451U CN215378451U CN202121339697.7U CN202121339697U CN215378451U CN 215378451 U CN215378451 U CN 215378451U CN 202121339697 U CN202121339697 U CN 202121339697U CN 215378451 U CN215378451 U CN 215378451U
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Abstract
The application discloses supply circuit, power supply unit and display screen, through switch module switching external input voltage when the input switches on the signal, control module exports when the input goes up the signal switch on the signal, time delay module absorbs and predetermines for a long time external input voltage, and will predetermine after long time external input voltage exports to the power consumption load as supply voltage, and time delay module can absorb the external input voltage of the unusual switching of switch module unusually to the external input voltage that makes this unusual switching can not be used in the power consumption load, thereby has guaranteed that the condition of voltage spike and overshoot can not appear in the supply voltage of output to the power consumption load.
Description
Technical Field
The application belongs to the technical field of power supply, and particularly relates to a power supply circuit, a power supply device and a display screen.
Background
The power supply circuit of the traditional display screen has voltage spikes and overshoots when being powered on, and the voltage spikes and overshoots of the power supply circuit can cause the damage of the display screen.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a power supply circuit, and aims to solve the problems that a traditional power supply circuit can generate voltage spikes and overshoots when being powered on.
A first aspect of an embodiment of the present application provides a power supply circuit, including:
the switch module is configured to switch an external input voltage when a conduction signal is input;
the control module is connected with the switch module and is configured to output the conducting signal when a power-on signal is input; and
and the delay module is connected with the switch module and configured to absorb the external input voltage for a preset time length and output the external input voltage after the preset time length as a power supply voltage to a power load.
In one embodiment, the system further comprises a pull-down module;
the pull-down module is connected with the control module and configured to output a pull-down signal when the input of the power-on signal is stopped;
the control module is further configured to stop outputting the on signal when the pull-down signal is input;
the time delay module is further configured to absorb a kickback voltage of the power load when the power supply voltage stops being output.
In one embodiment, the delay module includes a delay component and a filter component;
the time delay assembly is configured to absorb the external input voltage for the preset time;
the filtering component is connected with the time delay component and configured to filter the external input voltage after the preset time length to generate the power supply voltage.
In one embodiment, the switch module includes a first capacitor, a first resistor, and a first field effect transistor;
the source electrode of the first field effect transistor, the first end of the first capacitor and the first end of the first resistor are connected in common and connected to the external input voltage input end of the switch module, the second end of the first resistor and the grid electrode of the first field effect transistor are connected and connected to the conduction signal input end of the switch module, the drain electrode of the first field effect transistor is connected to the external input voltage output end of the switch module, and the second end of the first capacitor is connected with a power ground.
In one embodiment, the control module comprises a second resistor, a third resistor and a second field effect transistor;
the first end of the second resistor is connected to the power-on signal input end of the control module, the second end of the second resistor is connected with the base of the second field-effect tube, the collector of the second field-effect tube is connected to the conduction signal output end of the control module, the emitter of the second field-effect tube is connected with the first end of the third resistor, and the second end of the third resistor is connected with a power ground.
In one embodiment, the pull-down module includes a fourth resistor and a second capacitor;
a first end of the fourth resistor is connected with a first end of the second capacitor and is connected to a pull-down signal output end of the pull-down module and an electrifying signal input end of the pull-down module; and the second end of the fourth resistor and the second end of the second capacitor are both connected with the power ground.
In one embodiment, the delay element includes a third capacitor;
the first end of the third capacitor is connected to the external input voltage input end of the time delay assembly and the recoil voltage input end of the time delay assembly, and the second end of the third capacitor is connected to a power ground.
In one embodiment, the filter assembly includes a fourth capacitor;
the first end of the fourth capacitor is connected to the external input voltage input end of the filtering component and the power supply voltage output end of the filtering component, and the second end of the fourth capacitor is connected with the power ground.
A second aspect of embodiments of the present application provides a power supply device, which includes the power supply circuit according to any one of the first aspect.
A third aspect of embodiments of the present application provides a display screen, which includes the power supply circuit and the display screen body as described in any one of the first aspect;
the display screen body is the electric load.
Compared with the prior art, the embodiment of the utility model has the following beneficial effects: when the external input voltage is initially applied to the switch module, the external input voltage at the moment can be increased from 0 volt to a stable direct current voltage, and in the process, the switch module can work abnormally. When the power supply voltage is abnormal in work, the switch module can transfer the external input voltage under the condition that no conducting signal is input, the external input voltage abnormally transferred by the switch module is equivalent to the external input voltage with preset duration, and the external input voltage with the preset duration can be absorbed by the delay module, so that the external input voltage abnormally transferred cannot act on the power load, and the condition that voltage spike and overshoot cannot occur in the power supply voltage output to the power load is guaranteed.
Drawings
Fig. 1 is a first exemplary functional block diagram of a power supply circuit provided in an embodiment of the present application;
fig. 2 is a first exemplary functional block diagram of a power supply circuit provided in an embodiment of the present application;
fig. 3 is a first exemplary functional block diagram of a power supply circuit provided in an embodiment of the present application;
fig. 4 is an exemplary circuit schematic diagram of a power supply circuit provided in an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, an embodiment of the present application provides a power supply circuit, which includes a switch module 110, a control module 120, and a delay module 130.
The switch module 110 is configured to switch the external input voltage VI when the on signal is input.
And a control module 120 connected to the switch module 110 and configured to output a turn-on signal when the power-on signal is input.
The delay module 130 is connected to the switch module 110, and configured to absorb the external input voltage VI for a preset time period, and output the external input voltage VI after the preset time period as a power supply voltage to the electrical load 200.
In this embodiment, when the control module 120 receives an externally input power-on signal, the control module 120 outputs a turn-on signal to the switch module 110, so that the switch module 110 is turned on and the externally input voltage VI is switched. In the preset time period after the switch module 110 starts to output the external input voltage VI to the preset time period, the delay module 130 absorbs the external input voltage VI, so that the external input voltage VI within the preset time period is not output to the electrical load 200. After the preset time, the delay module 130 outputs the external input voltage VI as a power supply voltage to the electrical load 200, so as to control the power supply circuit to supply power to the electrical load 200 after delaying the preset time. Meanwhile, when the external input voltage VI initially acts on the input switch module 110, the external input voltage VI at this time may rise from 0 v to a stable dc voltage, and in this process, the switch module 110 may work abnormally. When the power supply voltage is abnormal, the switch module 110 switches the external input voltage VI without inputting the conducting signal, and at this time, the external input voltage VI abnormally switched by the switch module 110 is equivalent to the external input voltage VI with a preset duration and is absorbed by the delay module 130, so that the external input voltage VI abnormally switched is not applied to the electric load 200, and thus, the power supply voltage output to the electric load 200 is prevented from being subjected to voltage spike and overshoot.
Wherein, the preset time can be 1ms to 10 ms.
Referring to fig. 2, in an embodiment, the power supply circuit further includes a pull-down module 140.
And a pull-down module 140 connected to the control module 120 and configured to output a pull-down signal when the power-on signal stops being input.
Accordingly, the control module 120 is further configured to stop outputting the on signal when the pull-down signal is input.
Accordingly, the delay module 130 is further configured to absorb the kickback voltage of the electric load 200 when the output of the supply voltage is stopped.
In this embodiment, when the external power-on signal stops being input to the control module 120 and the pull-down module 140, the pull-down module 140 outputs the pull-down signal to the control module 120. When the pull-down signal is input, the control module 120 stops outputting the on signal to the switch module 110, and the switch module 110 is turned off and stops transferring the external input voltage VI. The delay module 130 stops outputting the power supply voltage to the electric load 200, and absorbs the recoil voltage output by the electric load 200, so as to prevent the recoil voltage from acting on the electric load 200 again after acting on the switch module 110, thereby avoiding abnormal power-off of the electric load 200.
Referring to fig. 3, in one embodiment, the delay module 130 includes a delay element 131 and a filter element 132.
The delay component 131 is configured to absorb the external input voltage VI for a preset time.
And a filtering component 132, connected to the delay component 131, configured to filter the external input voltage VI after a preset time period to generate a supply voltage.
In this embodiment, the delay component 131 is configured to absorb the external input voltage VI for a preset time, so that the filter component 132 filters the external input voltage VI after the preset time and outputs the supply voltage to the electrical load 200, thereby implementing the delayed power-on of the electrical load 200. Meanwhile, the delay component 131 absorbs the external input voltage VI abnormally transferred by the switch module 110, so that the external input voltage VI abnormally transferred by the switch module 110 is prevented from acting on the electric load 200, and voltage spike and overshoot generated when the electric load 200 is supplied with power are eliminated.
Referring to fig. 4, in an embodiment, the switch module 110 includes a first capacitor C1, a first resistor R1, and a first fet Q1.
The source of the first fet Q1, the first end of the first capacitor C1, and the first end of the first resistor R1 are commonly connected to the external input voltage VI input terminal of the switch module 110, the second end of the first resistor R1 and the gate of the first fet Q1 are connected to the on-signal input terminal of the switch module 110, the drain of the first fet Q1 is connected to the external input voltage VI output terminal of the switch module 110, and the second end of the first capacitor C1 is connected to the power ground.
Referring to fig. 4, in an embodiment, the control module 120 includes a second resistor R2, a third resistor R3, and a second fet Q2.
A first end of the second resistor R2 is connected to the power-on signal input end of the control module 120, a second end of the second resistor R2 is connected to the base of the second fet Q2, the collector of the second fet Q2 is connected to the on signal output end of the control module 120, the emitter of the second fet Q2 is connected to a first end of the third resistor R3, and a second end of the third resistor R3 is connected to the power ground.
Referring to fig. 4, in an embodiment, the pull-down module 140 includes a fourth resistor R4 and a second capacitor C2.
A first end of the fourth resistor R4 is connected to a first end of the second capacitor C2 and connected to the pull-down signal output terminal of the pull-down module 140 and the power-up signal input terminal of the pull-down module 140; the second end of the fourth resistor R4 and the second end of the second capacitor C2 are both connected to power ground.
Referring to fig. 4, in one embodiment, the delay element 131 includes a third capacitor C3.
A first terminal of the third capacitor C3 is connected to the external input voltage VI input terminal of the delay component 131 and the kickback voltage input terminal of the delay component 131, and a second terminal of the third capacitor C3 is connected to the power ground.
Referring to fig. 4, in one embodiment, the filter element 132 includes a fourth capacitor C4.
A first terminal of the fourth capacitor C4 is connected to the external input voltage VI input terminal of the filter component 132 and the supply voltage output terminal of the filter component 132, and a second terminal of the fourth capacitor C4 is connected to the power ground.
The following description of the power supply circuit shown in fig. 4 is made in conjunction with the working principle:
when the external input voltage VI starts to be powered on, the voltage value of the external input voltage VI increases from 0 to the stable dc voltage, and the first fet Q1 is turned on abnormally. When the first fet Q1 is turned on abnormally, the external input voltage VI transferred by the first fet Q1 is absorbed by the third capacitor C3, so that it is not output to the electric load 200, and voltage spike and overshoot generated in the power supply to the electric load 200 are avoided.
When the external input voltage VI rises to a stable dc voltage, a power-on signal (high level) is input to the base of the second fet Q2, and the second fet Q2 is turned on. The voltage difference between the external input voltage VI at the collector of the second fet Q2 and the emitter of the second fet Q2 acts on the gate of the first fet Q1 and the drain of the first fet Q1, respectively, so that the first fet Q1 is turned on. The external input voltage VI flows through the first fet Q1. The third capacitor C3 absorbs the external input voltage VI for charging until the electric energy of the third capacitor C3 is full after a preset time, and at this time, the external input voltage VI flows through the first field effect transistor Q1, and is filtered by the fourth capacitor C4 and then is output to the electric load 200 as a supply voltage.
When it is necessary to stop supplying power to the electric load 200, the input of the power-on signal is stopped. At the moment of stopping inputting the power-on signal, the fourth resistor R4 and the second capacitor C2 output a low level to the base of the second fet Q2, and the second fet Q2 is turned off, so that the first fet Q1 is turned off. At this time, the kickback voltage output by the energy stored in the capacitor of the electric load 200 is absorbed by the third capacitor C3 and the third resistor R3, so that the kickback voltage does not act on the first field effect transistor Q1, which causes the kickback voltage to act on the electric load 200 again, thereby causing voltage abnormality when the electric load 200 is powered down.
The embodiment of the present application further provides a power supply device, including the power supply circuit of any of the above embodiments, because the power supply device of the present embodiment includes the power supply circuit of any of the above embodiments, the power supply device of the present embodiment at least includes beneficial effects corresponding to the power supply circuit of any of the above embodiments.
The embodiment of the application further provides a display screen, which comprises the power supply circuit and the display screen body in any one of the above embodiments, and the display screen in the embodiment at least comprises the beneficial effects corresponding to the power supply circuit in any one of the above embodiments because the display screen in the embodiment comprises the power supply circuit in any one of the above embodiments.
The display screen body is an electric load 200, and the display screen body works in an electrifying mode according to the power supply voltage.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A power supply circuit, comprising:
the switch module is configured to switch an external input voltage when a conduction signal is input;
the control module is connected with the switch module and is configured to output the conducting signal when a power-on signal is input; and
and the delay module is connected with the switch module and configured to absorb the external input voltage for a preset time length and output the external input voltage after the preset time length as a power supply voltage to a power load.
2. The power supply circuit of claim 1, further comprising a pull-down module;
the pull-down module is connected with the control module and configured to output a pull-down signal when the input of the power-on signal is stopped;
the control module is further configured to stop outputting the on signal when the pull-down signal is input;
the time delay module is further configured to absorb a kickback voltage of the power load when the power supply voltage stops being output.
3. The power supply circuit of claim 2 wherein said delay module comprises a delay component and a filter component;
the time delay assembly is configured to absorb the external input voltage for the preset time;
the filtering component is connected with the time delay component and configured to filter the external input voltage after the preset time length to generate the power supply voltage.
4. The power supply circuit of claim 1 wherein said switching module comprises a first capacitor, a first resistor, and a first field effect transistor;
the source electrode of the first field effect transistor, the first end of the first capacitor and the first end of the first resistor are connected in common and connected to the external input voltage input end of the switch module, the second end of the first resistor and the grid electrode of the first field effect transistor are connected and connected to the conduction signal input end of the switch module, the drain electrode of the first field effect transistor is connected to the external input voltage output end of the switch module, and the second end of the first capacitor is connected with a power ground.
5. The power supply circuit of claim 1 wherein said control module comprises a second resistor, a third resistor, and a second field effect transistor;
the first end of the second resistor is connected to the power-on signal input end of the control module, the second end of the second resistor is connected with the base of the second field-effect tube, the collector of the second field-effect tube is connected to the conduction signal output end of the control module, the emitter of the second field-effect tube is connected with the first end of the third resistor, and the second end of the third resistor is connected with a power ground.
6. The power supply circuit of claim 3 wherein said pull-down module comprises a fourth resistor and a second capacitor;
a first end of the fourth resistor is connected with a first end of the second capacitor and is connected to a pull-down signal output end of the pull-down module and an electrifying signal input end of the pull-down module; and the second end of the fourth resistor and the second end of the second capacitor are both connected with the power ground.
7. The power supply circuit of claim 3 wherein said delay component comprises a third capacitor;
the first end of the third capacitor is connected to the external input voltage input end of the time delay assembly and the recoil voltage input end of the time delay assembly, and the second end of the third capacitor is connected to a power ground.
8. The power supply circuit of claim 3 wherein said filter assembly comprises a fourth capacitor;
the first end of the fourth capacitor is connected to the external input voltage input end of the filtering component and the power supply voltage output end of the filtering component, and the second end of the fourth capacitor is connected with the power ground.
9. A power supply device characterized by comprising a power supply circuit according to any one of claims 1 to 8.
10. A display screen, characterized by comprising the power supply circuit of any one of claims 1 to 8 and a display screen body;
the display screen body is the electric load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121339697.7U CN215378451U (en) | 2021-06-16 | 2021-06-16 | Power supply circuit, power supply device and display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121339697.7U CN215378451U (en) | 2021-06-16 | 2021-06-16 | Power supply circuit, power supply device and display screen |
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| Publication Number | Publication Date |
|---|---|
| CN215378451U true CN215378451U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121339697.7U Active CN215378451U (en) | 2021-06-16 | 2021-06-16 | Power supply circuit, power supply device and display screen |
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| CN (1) | CN215378451U (en) |
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- 2021-06-16 CN CN202121339697.7U patent/CN215378451U/en active Active
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